The power supply is an electrical device that transforms power to the peripheral devices or circuit boards. Its main function is to convert electrical energy in terms of voltages, currents, and frequencies.
The power supply comes with everything from on/off switches, voltage, and current tuners to the LED display. That is why I’ve decided to make a list of Top 7 Best DC Power Supply 2020 that benefits the electronic aspirants, engineers, and lab technicians.
Making a list of the best power supply is a tough job as you mainly consider the price tag and quality factor to deal with. Ideally speaking, the product features should be your top priority.
Here I’ve provided a “buying guide” for DC power supply. Read on to know more!
First and foremost on our list is the Tekpower DC power supply. It is listed in the top position because of its huge-bulky design that makes the device more portable than others.
For its reliable and versatile nature, it can also be used as a testing tool in labs, industries, research institutes, and R&D centers. Let’s discuss in brief.
This brilliant power supply can operate in 2 different modes i.e. voltage and current. When compared to others it has high precision regulated power supply that comes with rotating switches to regulate voltage (30V) and current (5A). It also features an automatic cooling fan with a built-in thermal sensor.
When you buy this product, all the components are neatly packed in a cardboard box and a data-sheet is offered to you that contain the following specifications:
- DC output voltage range is 30VT
- DC output current is 5A
- Input AC voltage is 110V/60Hz
- Voltage and current adjustment
- High current-limiting cooling fan
- Operating temperature is 0-40°C
- Relative humidity is less than 80%
- Accuracy of LCD is ±2.5%
- For ripple and noise; CV < 1 mV, CC < 3 mA
- For voltage regulation; CV < 0.01% + 3mV, CC < 0.2% + 6 mA
- For load regulation; CV < 0.01% + 3mV, CC < 0.02% + 3mA
Have you ever want to know what is in the box? Here it is…
- Power supply (TP3005T)
- Power cord
- Test leads with clips (28-inches) and
- A user manual
Overall, the performance of Tekpower Power Supply is fantastic. I prefer this kit as it’s my all-time favorite and the best power supply kit with wonderful features available in the market. Though the price is a bit expensive, you can buy the kit for extended use.
- Highly reliable.
- Vary the voltages and currents.
- Offers high standard customer services.
- Provided 1-year of manufacturer warranty.
- Very expensive.
- Cannot function effectively if you supply voltage more than 30V.
2nd one in the list is from the Eventek brand. This branded company has major sales in electronics, peripheral devices, and other household products. It has always been committed to providing better services to customers.
This is a light-weighted kit with all the features that a power supply must-have. It is specially designed for schools, engineering colleges, laboratories, electronic product testing, and development.
Ideally, it can be a good choice for the industry featuring high accuracy, reliability, and short-circuit protection circuit.
The front panel of the power source contains an LED display, voltage, and current tuners, amplitude switch, 3-ports for positive-negative-ground connections and the main power switch. Internally the power supply has a temperature controller to reduce the noise and prolong its life effectively.
The specifications of an adjustable power source are as follows:
- DC output voltage is 0-30V
- DC output current is 0-10A
- Overall efficiency is 89%
- High current limiting and cooling fan
- Voltage is 0.1V & current is 0.1A
- Temperature control fan ( if higher than 50°C)
- Dimensions are 8.8*3.2*6.5-inches
- Weighs about 3.2pounds
- Voltage regulation; CV 0.01% + 3mV, CC < 0.2% + 6 mA
- Load stabilization; CV 0.1% +1mV / CC 0.1% +3mA
- Ripple and noises; CV < 1 mV rms, CC < 3 mA, rms
This wonderful power supply kit contains the following contents:
- Eventek Power supply (KPS3010D)
- Output power cord (2)
- Input power cord
- Connecting probes and
- A user-guide
- Multiple protections.
- Able to change voltage and current readings.
- 30 days money back offer and 12 months of limited guarantee.
- Bit expensive.
- Not much comfortable to use.
This MDC02 DC Power Supplies are stable and allows continuous adjustment of both output current and voltage levels. It features high accuracy, reliability, multiple protection like perfect overload and short circuit protection circuit.
It is designed for schools, laboratories, and electronic maintenance that suits both industrial, research institutes, and lab use. Its temperature control intelligent fan offers an excellent heat dissipation effect, which will reduce the noise & prolongs the product’s life.
The high precision positioner will help to get a more accurate reading to switch between coarse and fine tuning at 1V/0.01V and 0.1A/0.001A. It is compact, lightweight, durable, portable and easy to carry DC power supply with 4 digits display, which is visible even in low light usage.
It has two knots to finish all data adjustments for two operation modes (voltage and amperage) adjustments to select between course and fine. It comes with rotating switches to regulate voltage (30V) and current (10A).
The specifications of an adjustable power source are as follows:
- DC output voltage is 0 – 30V
- DC output current is 0 – 10A
- Input voltage: 110V AC, 50HZ/60Hz+2Hz
- High current limiting and cooling fan
- Voltage is 0.01V & current is 0.1A
- Temperature control fan (if higher than 60°)
- Protection: constant current and short-circuit protection
- Voltage indication accuracy: LED+0.5%+5digits
- Current indication accuracy: LED+0.5%+5digits
- Weighs about 3.50 pounds
- Line regulation: CVs0.02%+5mV CCs0.2%+1mMA
- Load regulation: CVs0.02% + 10mV CCs0.5%+10mA
- Ripple and noise: CVs10mVr.m.s CCs10mAr.m.s
- Environment: 0~+40°C relative humidity:<90%
Want to know what is in the power supply kit? Here it is
- MDC02 DC power supply
- Output power cord
- Input power cord
- User manual
- Can alter the voltage and current readings
- Multiple protections
- Coarse and fine-tuning & data hold function
- Higher precision function with 4-digit readings.
- Compact, portable and lightweight
- Cannot tolerate extreme conditions.
- No warranty information.
Number 4 on our list is from Yescom power supply. It is a good product for engineers and lab technicians.
Though you constantly work on voltage and current operating modes, cannot functions both the parameters at a time. This is the major drawback in all the power supply devices.
In this, the circuit is designed safely with high-quality components. The outer layer is made of a steel case to protect the internal circuitry from environmental parameters. You can use the power supply containing full load for 24 hours without any interruption. A temperature controller adjusts the speed according to the load and reduces the distortion accordingly.
As there is no use of batteries, you can directly connect the power supply device to an external source. A user-friendly manual is provided along with the power source to guide the user about working operations of a power supply.
The parameters you must consider when you deal with a power source are:
- 110V of AC power supply
- Input voltage is 110V±10% 60Hz
- Output voltage is DC 0-30V
- Output current is DC 0-10A
- Dimensions are 10.2*4.9*6.1 inches
- Display resolution is voltage-0.1V, current-0.1A.
- Display precision is ±1% ±1digit
- Voltage stabilization is 0.05% +1mV
- Current stabilization is 0.1% +10mA
- Load stabilization is CV 0.1% +1mV / CC 0.1% +10mA
- Ripples and noise CV 10mV/ CC 20mA
- Working conditions are 14°F to 104°F relative humidity < 80%
- Storage conditions is -4°F to 176°F relative humidity < 80%
The kit contains the following components:
- DC power supply
- Power cord
- Test leads and
- A user-friendly manual
- Multiple protections.
- Adjustable voltage and current readings.
- Use the power supply 24 hours.
- Although the individual performance of the components is good; a slight change in the overall performance of the power supply.
Number 5 is going to be obvious from the Korad digital power supply. Korad brand is famous for supplying electronic & mechanical tools and sell them globally.
The cost of this power supply is too high when compared to others mentioned in the list. It is highly reliable and performance is fantastic. For this reason, it is listed number 5 in our best digital power supply kits.
The key features of Korad digital power supply are a digital controller, temperature controlled fan, knob lock function and low noise ripple.
This power supply comes with a compact design using 4-digit LED displays and digital controllers. There is an option for you to switch the input power supply between 110-220V and current in milliAmpere to Amperes.
Here are a few parameters you should consider before you pay money for Korad DC power supply:
- 110/220V of input voltage
- Voltage and current range is 0-30V/0-5A
- Temperature coefficient is 150 PPM
- Ripple voltage is 2MV and for current is 3MA
- Product weights about 4.8kgs
- Comfortable to use.
- Operates in 2 different switching modes.
- Too expensive.
- Fixed length parameters.
Last but one in the list is from LE power adapter. The manufacturer of LE (Lighting Ever) power adapter provides environmental-friendly products at its best possible prices.
When we made a research, 72 out of 100 people have given 5-star rating for its quality, portability and multiple applications. Though it is very economical to buy; delivers high performance when you connect to an external source. For this reason, it is listed number 6 of all the available power supply devices.
This amazing power supply source is suitable for TVs, radios, computers and LED lights. It just comes with a power adapter and USB cable. With this power adapter, you can supply input power of 100-240V and produces 12V DC at the output.
The following factors are to be considered when you make use of a power supply:
- Input voltage is100-240V AC
- Output voltage is 12V D
- Max current is3A
- Max wattage is36W
- US plug and
- DC port diameter is5*2.1*10mm
- Flexible nature.
- Very convenient to use.
- Major application in LED lights.
- 1-year of warranty by the product manufacturer.
- Not waterproof.
- An instruction manual is not included.
- Voltage and current readings are fixed.
The last one in the list is from BMOUO manufacturer. This famous brand is committed to providing each customer with high customer service.
This amazing product makes easy to interface with the TVs, radios, computers and LED strip lights. When you use this power supply for lighting the LED strips, be sure to set the minimum voltage that an LED can withstand. Else there will be huge damage.
It features the protection when there are overload voltages and currents. The outer shell is made of aluminum so as to keep away from shock absorbers.
The specifications of BMOUO regulated switching power supply are as follows:
- AC input voltage is 115V/230V
- Output voltage is 12V DC
- Output current is 0-29.2A
- Weighs 660 grams
- Size is 215*114*50mm and
- Shell material made of Aluminum
- Easy to set up.
- Multiple protections.
- Generates steady and precise outputs.
- The instruction manual is not provided.
- Fixed voltage and current settings.
What are the different types of DC power supplies?
Controlled electrical energy comes quite handy in the context of myriad testing situations and therefore power supply has emerged as a piece of popular electronic test equipment. So, let us have a look at the different types of DC power supplies that are commonly used for maintenance, development, testing and measurement.
- Constant Current/ Voltage
Current current/voltage power supply as per the name says provides constant current as well as constant voltage. Besides this, it is considered to be the most popular DC power supply.
When the operation takes place in constant current mode, then the following type of power supply maintains the set current even when there is a change in the load resistance.
Some of the features that you will find in Constant Current/Voltage power supplies are master/slave connections, remote sensing, and analog programming.
- Multiple output
Multiple output power supplies consist of 2-3 power outputs. If you are someone who uses multiple voltages while you are testing, then a multiple output power supply can be a perfect choice for you.
A number of users choose a triple-output power supply which consist of one digital logic output while coupling of outputs for bipolar analog circuitry.
Some of the features that you will find in multiple output power supply are settable Voltage limitations, timed operations, storage registers and connectivity of two channels in series for higher voltage or current.
Programmable power supplies is commonly known as system power supplies and they are generally used hand-in-hand alongside computer-operated system for testing and production.
A number of computer interfaces are used by system power supplies such as GPIB, IEEE-488, RS-232 serial communications, USB interfaces, and Ethernet.
Also, the following type of power supplies use certain command languages through which instructions are sent to the instrument via the digital interface.
Some of the language that are used are SCPI-like, proprietary and SCPI. This type of power supply is quite useful while you are working on complex setups as it has the ability to control the programmable power supply through the computer. Hence, you won’t have to push keys in the front panel of the instrument.
What are the advantages of DC Power supply?
- It is noted that most of the appliances consume electric power in DC. For instance, electric motor, electronics, heating elements, and electric car consumes the electricity in DC. It is also seen that even some 3 phase AC electric motor can’t compete with DC motor in terms of simplicity and efficiency.
- Capacitive and inductive parameters don’t limit the capacity of transmission of the DC overhead cable. Also, the conductor cross section is utilized to its full potential as it doesn’t have any skin effect. This arguably means that it can come in handy for long-distance transmission. Hence, it can be quite useful for transmission across large cities, open sea and large complex electricity grid.
- Implementation of digital control system can be done to assure instant and accurate control of the active power flow.
- Hardware cost that is used in High Voltage DC for the purpose of long distance transmission is about 1/3 as compared to its counterparts.
- When a DC power line is integrated into an existing AC power grid, then DC power can have achieved fast modulation and perhaps damp the oscillation effect of the AC system. Thus, the stability of the complete system is maintained.
Unregulated Vs Regulated DC power supply – What is the difference?
- Unregulated DC power supply
Unregulated power supplies are those that are very basic in nature and all they do is lower down the input AC and perhaps change in order to produce DC and just an output cap is added in order to reduce the ripple. So, years ago, we had similar kind of power supplies.
In Unregulated supplies, output voltage is stated by the transformer turns ratio. Hence, the output is directly related to the input AC voltage.
Another problem that you may face with unregulated supplies is that the output voltage is perhaps the input voltage function. In addition, the output voltage would fluctuate depending on the current that is being taken from the supply.
- Regulated DC power supply
A lot of modern DC power supply doesn’t work out the way like we have mentioned above. So, any consumer electronics that you would buy these days would have a regulated DC power supply. However, you may still face unregulated supplies from various electronics suppliers.
A regulated DC power supply has the ability to control the output voltage quite actively. Besides this, it has additional circuitry through which the output voltage can be tweaked down and up.
This is perhaps done to compensate the variations of the input voltage as well as the variations in current due to load. This is done continuously to compensate for input voltage variations as well as the variations happening in the current due to load.
Factors To Consider Before Purchasing a DC Power Supply Device?
You will find a number of DC power supply device available in the market but not each of them might be suitable for you. So, we would be covering some of the major considerations that you would need to keep in mind. Let us discuss:-
It is perhaps the most important factor that you should consider before purchasing the best DC power supply in 2020.
Technically, it is defined as the extent at which the result of a calculation, measurement and specification matches to the correct standard or value.
Besides this, it also determines the power supply performance by closely matching to the theoretical value.
In general, the accuracy value are obtained by the quality of the regulation process and the conversion. Both current settings and voltage have accuracy specifications linked with them.
The accuracy denotes the point at which the output values matches with the international standards.
Most of the DC supplies comes along with in-built measurement circuits for measuring both the current and voltage.
Just in case, the output which is obtained is not clear due to minor errors in DAC, then the best way through which the accuracy can be tested is by measuring the variable power system through which the offset setting value is obtained.
Resolution is perhaps another factor that you should look out just in case you think of buying a DC electronic power supply.
It is perhaps the small change in current or voltage that occurs due to the power supply device.
In other words, we can say that resolution is absolute full-scale percentage or value.
Besides this, it is limited to the number of DAC and discrete levels. You should also keep in mind that the more number of bits, perhaps better resolution you will obtain.
3. Ripple & Noise
The DC power supply output is commonly referred as random deviation and period.
Ripple is commonly defined as the output voltage inherent ac component that is obtained due to internal switching that takes place in the power supply.
So, when the signal is viewed in the frequency domain, then the ripples showcase false responses.
On the other hand, noise is a parasitics manifestation that happens inside the power supply. It appears as a result of high-frequency voltage spikes that takes place in the output voltage.
Noise in general is quite random and if you view that in frequency domain, then you will notice that there is a slight increase that occurs in the baseline.
So, if you are testing noise and ripple, there are a few things that you would have to keep in mind.
The first thing is that loading can have a significant impact on the ripple and thus it is important that you take the measurement in perhaps the same loading conditions.
Moreover, ripple can also get affected due to the input voltage, and thus you should perform the tests at various input voltages.
Additionally, there are a number of manufacturers who apply external capacitors at the power supply output for measurement purposes.
Lastly, 20 MHz bandwidth limit should be used on the oscilloscope channel for the measurement purpose.
The DC power supply performance can get changed if used for the long term. So, in order to maintain the power supply stability, proper calibration and verification need to be done.
Hence, for greater stability, the temperature range should be around 20-30 degrees.
5. Transient response
Transient response is denoted as the amount of output voltage deviation due to change that occurs in loading.
So, when the change in the loading takes place, then either the power supply has a lot of stored energy or perhaps not enough of it. Hence, it is not able to react immediately in the new condition.
Thus, output capacitors would be responsible for lack of energy or excess energy.
So, they would preferably expend the charge to cope with the load. In such a case, there would be voltage decrease. On the contrary, excess energy would be stored which would result in voltage increase.
There are a few conditions in context of transient response in which its measurement might get affected.
Some of the important conditions are starting current, slew rate and the ending current. The slew rate has significant impact in the context of transient response.
The reason is that the faster the load changes would be, the more deviation it would be in the output before finally the power supply copes up with the changing conditions.
Besides this, the starting and ending of the current level can also cause significant impact.
Lastly, for accurate transient response measurement, user would preferably need two scope channels.
What Are The Applications of DC Power Supply?
Off lately, DC power supply is used as a testing tools is used in a number of industries, labs, R & D centres and research institutes. Let us have a brief look at the area of application:-
1. Mobile and laptop repair centres
It is widely used in Anodizing, Battery charging, Electroplating, LED applications, Hydrogen generation, Electrolysis, electrochemical applications to name a few.
Additionally, it is also used for Transceiver car woofers, 3D printers, LED strips and Audio amplifiers.
2. Commercial and domestic premises
DC power supply is commonly used in a number of extra-low and low voltage applications especially when they are powered by solar power systems or batteries. In addition, a number of electronic circuits also need a DC power supply.
Some domestic applications of DC power supply are connectors, sockets, fixtures and switches that are suitable for alternating current.
On the contrary, some of the applications in commercial properties are medical centres, office buildings, retail stores, malls, hotels, farm land, multifamily housing buildings, garages, warehouses etc.
3. Automotive industry
DC power supply is widely used in automotive battery that perhaps provides the power needed for lighting, engine starting and the ignition system.
4. Telecommunication industry
The equipment that is used in telephone exchange communication uses the standard – 48 V DC power supply. In order to achieve the negative polarity, the battery bank and the positive terminal of the power supply system is grounded.
5. HVDC systems
The HVDC power transmission systems makes use of DC for the purpose of bulk electrical power transmission.
In addition, for the purpose of long-distance transmission, HVDC system proves to be less expensive and the electrical losses that are suffered is also low.
6. Fuel cell
Light aircraft electrical systems make use of 12 V or 24 V DC which are similar as compared to automobiles.
Few Words to Say
Now you came to know about the key factors that improve the performance of a DC power supply. What will be your next step? Which one are you going to buy? Low or high price? Quality? or the Performance?
Don’t get confused! We are here to help you out!
Of all the 7 DC power supply devices, we have selected Tekpower Variable DC Power Supply as the best because of its unique design and portable nature that can be used in labs, industries, research purposes etc. Internally, it features cooling fan provided with a thermal sensor to keep the device cool all the time.
Though the product is bit pricey, it offers an excellent performance than others in the list. Also, the manufacturer of this item provides 1-year of warranty.
Take the right decision before you purchase the DC power supply. We hope this article is helpful. Further, if you have any doubts or questions about DC power supply, write to us in the comment section given below.