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