KQ7901-80-20 80V 20A 400W Programmable DC Power Supply

KUAIQU KQ7901 is a professional high‑precision programmable DC power supply designed for laboratory R&D, electronic repair, battery charging, industrial aging testing, production lines, and automated equipment. It integrates ultra‑high accuracy, comprehensive safety protection, flexible programming, rich communication functions, and intelligent human‑machine interaction to provide stable, clean, and reliable power output for the most demanding applications.

Technical Specifications

Parameter	Specification
Model	KQ7901-80-20
Output Voltage Range	0 ~ 80V Continuously Adjustable
Output Current Range	0 ~ 20A Continuously Adjustable
Rated Power	400W
Ripple & Noise	5 mV rms, 30 mV p-p
Voltage Resolution (Setting & Readback)	1 mV (0.001V)
Current Resolution (Setting & Readback)	1 mA (0.001A)
Power Readback Resolution	1 mW (＜ 100W); 10 mW (≥ 100W)
Display Screen	4.3-inch 5-Digit HD Color Screen
Memory Groups	100 Sets of Parameter Storage
Programming Mode	Panel Setting + USB File Import
Working Mode	Normal Mode / Forced CV Mode
Communication Interface	USB, RS232, Optional RS485
Communication Protocol	Modbus RTU
Adjustable Baud Rate	1200, 2400, 4800, 9600, 14400, 19200, 38400, 56000, 57600, 115200, 128000, 230400
Fast Charge Ports	USB-A + USB-C Dual Ports
Protection Functions	OVP, OCP, OTP, Short Circuit Protection, Reverse Polarity Protection, Panel Lock
Cooling System	Intelligent Temperature-Controlled Fan
Input Voltage	110V / 220V AC Switchable
Continuous Operation	24-hour Long-Term Stable Working Support
Display Language	Chinese / English Switchable

Product Features

1. 4.3-inch High Brightness HD Large Screen

Built-in a 4.3-inch high-brightness HD color screen with 5-digit high‑precision real‑time display. Despite its compact desktop size, the large screen provides an excellent visual experience, clearly showing voltage, current, power, and waveform data with high definition.

2. Real-Time Dynamic Dual Curve Display

The large screen can display real‑time dynamic voltage, current, and power curves. Users can monitor waveform changes intuitively, making it easier to observe circuit behavior, analyze load changes, and capture abnormal conditions.

3. Reverse Polarity Protection

The power supply is equipped with dedicated reverse polarity protection. When the positive and negative poles are connected incorrectly, the device immediately triggers protection, activates the buzzer alarm, and displays a reverse polarity warning on the screen.

All button operations are locked during the protection state and cannot be exited manually. The unit automatically returns to the main interface only after the wiring is corrected, effectively preventing damage to the power supply and load equipment.

4. Innovative Dual Adjustment Modes

The device features an innovative dual‑mode setting interface that supports two ways to adjust parameters:

Precise encoder knob for fast and continuous adjustment
Direct numeric keypad input for accurate value setting

With 0.001V/0.001A high‑precision display, parameter adjustment is more intuitive and precise than ever.

5. Panel Lock Function to Prevent Misoperation

A dedicated panel lock button is available to lock all key and knob operations during long‑time output. This prevents accidental touch or misoperation by other personnel, ensuring stable and uninterrupted work.

6. Configurable Communication Port Parameters

Communication parameters such as baud rate can be freely configured to match common industrial standards.

The power supply features calibrated high‑precision voltage and current measurement, complete configuration, and can be directly accessed into industrial networks for automated testing and control.

7. High Precision DC Regulated Power Supply (Millivolt Level Control)

Adopts high‑precision 5‑digit color LED display:

Voltage resolution: 0.001V
Current resolution: 0.001A
Power resolution: 0.001W

It provides ultra‑clean power for precision electronic components, testing instruments, and sensitive equipment.

8. Intelligent Temperature‑Controlled Fan with Low Noise

The intelligent fan starts working automatically upon power‑on and adjusts speed dynamically based on working temperature.

Combined with built‑in heat sinks and multi‑hole ventilation design, the power supply maintains excellent heat dissipation, low noise, and stable low‑temperature operation, supporting 24‑hour continuous high‑load testing.

9. Ultra Low Ripple & Low Noise

The power supply provides extremely clean output:

Voltage ripple: ≤15mV(p-p) / ≤5mV(rms)
Current ripple: ≤10mA(rms)

This meets strict requirements for high‑purity power supply in precision testing, R&D, and sensitive electronic applications.

10. Forced CV / CC Modes

Two working modes to satisfy battery charging, laboratory testing, and industrial aging:

Normal Mode: Voltage priority; automatically switches to constant current when reaching the current limit.
Forced CV Mode: Output voltage is strictly maintained at the set value. Current changes automatically according to Ohm’s law I=U/R and may exceed the set current limit (e.g., set 5A but output up to 10A under short‑circuit conditions).

11. Built-in USB-A & USB‑C Fast Charging

Equipped with USB‑A and USB‑C fast charging ports that support multiple fast charging protocols.

Real‑time voltage and current output of the USB ports are displayed on the main screen, providing convenient and diversified power supply for mobile phones, tablets, and other devices.

12. Optional Communication Ports & Modbus Protocol

Supports optional USB + RS232 + RS485 serial ports with standard MODBUS RTU protocol.

Free PC software is provided for remote computer control, PLC control, MCU control, and secondary development through communication protocols.

13. Upgraded 100 Groups Data Storage

The power supply supports 100 groups of intelligent data storage. Users can save frequently used parameters and recall them with one key, greatly improving efficiency in laboratories, electroplating, production lines, DIY projects, and repetitive testing.

14. Customizable OCP & Short Circuit Protection

OCP (Over Current Protection): Monitors output current in real time. When exceeding the set limit, it alarms and cuts off output, displaying “OCP” on the screen.
Short Circuit Protection: Triggers buzzer alarm and displays “OCP” warning when short circuit is detected.

15. Customizable OVP (Over Voltage Protection)

Real-time monitoring of output voltage. When voltage exceeds the preset limit, the device immediately alarms, cuts off output, and displays protection prompts to fully protect load equipment.

16. Dual‑Mode Programming: Panel Setting + USB Import

This programmable DC power supply supports two programming methods:

Direct parameter setting on the panel
One‑click parameter import via USB file

This combination of convenience and efficiency is ideal for R&D, production lines, and quality inspection.

17. Computer & Automated Remote Control

Through USB / RS232 / RS485 communication ports, the power supply can connect to a computer for stable remote control, automated testing, data recording, and long‑distance industrial control.

Application Scenarios

Laboratory R&D and precision circuit testing
Electronic repair, phone repair, PCB maintenance
Lithium battery & lead-acid battery charging & activation
Industrial aging testing & production line testing
Automated equipment & PLC integrated control
School teaching & electronic training
Electroplating, DIY, and scientific experiments

Quality Check and Terms of Service:

Package includes: DC Power Supply *1, Output Power Cord *1, Input Power Cord *1, User Manual *1, Warranty Card *1.
Has passed CE & FCC Certification.
All DC power supplies and accessories are inspected before shipment to ensure good quality.
Customer support: Contact us with any questions, and we'll respond within 24 hours.

Garantía

Warranty

30-Day return and refund guarantee (Refer to our Refund Policy), 2-year warranty (only available for orders purchased directly from kuaiquinstrument.com), lifetime technique support by KUAIQU.

Please feel free to reach us with any concerns:

Email: kuaiquinstrument@163.com

We strive to reply to you within 24 hours.

Shenzhen Kuaiqu Electronic Co., Ltd. was founded in 2014 and is located in Shenzhen City, Guangdong Province. It is a scientific and technological enterprise integrating,production and sales. Specializing in the production of DC stabilized power supply, variable frequency power supply, switching power supply, program-controlled power supply and other 100 kinds of measuring teaching instruments and industrial special equipment.

We are committed to delivering premium products and exceptional customer service, striving to be your most reliable and intelligent assistant.

Garantía de precio

At KUAIQU, we are committed to providing our customers with the best value for their purchases. To ensure you always get the best price, we offer a 30-day price guarantee on all products purchased directly from kuaiquinstrument.com. This policy aims to give you confidence and peace of mind when shopping with us.

What is the 30-Day Price Guarantee?

Our 30-day price guarantee means that if you purchase a product from kuaiquinstrument.com and the price of that product drops within 30 days of your purchase date, you are eligible for a refund of the price difference of the products. (Prices are based on USD. No refunds will be given for price changes in other currencies due to exchange rate fluctuations.)

How Does the Price Guarantee Apply?

Eligibility: The price guarantee applies only to purchases made on kuaiquinstrument.com. Products purchased from other retailers or third-party sellers are not eligible.
Timeframe: The price drop must occur within 30 days of your original purchase date.
Product Match: The price guarantee applies to the same product (identical model, specifications, and condition).

How to Apply for a Price Difference Refund

If you notice that the price of a product you purchased from kuaiquinstrument.com has dropped within 30 days, follow these steps to apply for a refund of the price difference:

Documentation: Prepare your order number and proof of the price drop (such as a screenshot and link to the product page showing the reduced price).
Contact Us: Reach out to our customer support team at kuaiquinstrument@163.com. Include your order number, proof of the price drop, and a brief explanation of your request.
Verification: Our team will verify the price drop and your purchase details.
Refund Process: Once verified, we will process the refund for the price difference to your original method of payment. It typically takes 1-3 business days for you to receive the refund.

At KUAIQU, we strive to provide our customers with high-quality products and exceptional customer service. Our 30-day price guarantee is just one of the ways we ensure you get the best value for your investment. Shop confidently with KUAIQU, knowing that you are always getting the best deal available.

Thank you for choosing KUAIQU. If you have any questions or need further assistance, please do not hesitate to contact our customer support team at kuaiquinstrument@163.com.