Lower programming control loop for improving programmable DC power supply output response speed

Abstract

The invention discloses a lower programming control loop for improving programmable DC power supply output response speed. The lower programming control loop is formed by a data acquisition and processing circuit, an ADC (analog to digit converter) circuit, a CPU system, a DAC (digital analog converter) circuit and a lower programming circuit, the negative bias voltage source is added on the negative terminal of the programmable DC power supply, and the lower programming circuit is connected between the programmable DC power supply and bias voltage source negative terminal. According to the invention, the lower programming control loop comprises the CPU system and the data acquisition and processing circuit, the output voltage, electric current and corresponding lower programming circuit can be monitored in real time, a negative feedback control circuit in parallel is adopted, the control of the lower programming circuit is realized, by the reason of the constant lower programming circuit in the circuit, the output voltage of the programmable DC power supply is rapidly decreased to 0V and maintains the performance when voltage is near 0V, so that the output response speed and performance of the programmable DC power supply is improved.

Description

technical field [0001] The invention relates to the field of program-controlled DC power supplies, in particular to a lower programming control loop for improving the output response speed of the program-controlled DC power supply. Background technique [0002] Programmable DC power supply under light load or no load condition, the output capacitor of the power supply will discharge slowly. If the programmable DC power supply is used as a static voltage source, there is no problem at all, but when testing under rapidly changing voltages, slow discharge speed equals slow response speed and performance. This will undoubtedly have extremely adverse effects on the response speed and performance of the programmable DC power supply. The invention relates to a program-controlled DC power supply programming circuit, which has the ability to program the programming current, and performs fast program-controlled discharge on the output capacitor of the power supply, so that the output...

AI Technical Summary

Problems solved by technology

When the output voltage is low, the maximum load at low voltage (VL) is limited to the on-resistance R of the MOSFET power tube DS With the sense resistor R1 connected in series, its maximum down programming current is limited to: VL / (R DS +R1), at the same time, the MOSFET power tube is in a deep saturation state, and the dynamic adjustment ability is significantly reduced

Therefore, when the programming current is close to 0V, the performance will decrease obviously, and it is impossible to realize fast programming control under high current.

[0004] Although the conventional down-programming circuit can improve the output response speed and performance of the programmable DC power supply, the circuit is simple and easy to implement, but the performance of the down-programming current will drop significantly at low-voltage output, especially when it is close to 0V, and the down-programming current capability will be greatly reduced. , affecting the output response speed and performance of the programmable DC power supply when the output voltage changes

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