Wide-range DC power supply with constant power output characteristic

Abstract

The invention relates to a DC power supply product, in particular to a wide-range DC power supply with the constant power output characteristic. The power supply comprises a preceding-stage DC power supply, a voltage reducing circuit, a sampling circuit and a CPU control circuit. The voltage reducing circuit comprises an MOS switching tube, a diode, an energy storage inductor, a current sampling resistor, an output filtering capacitor and a load resistor. The sampling circuit collects the current, the voltage and the power value of a load and feeds the current, the voltage and the power value of the load back to the CPU control circuit. The CPU control circuit outputs a control signal by comparing sampling values and given values to control on-off of the MOS switching tube. In a certain power range, the high-voltage or large-current output capability can be achieved respectively. Meanwhile, constant-power output in a working zone can be achieved, and therefore the automatic range outputting characteristic is achieved.

Description

technical field [0001] The invention relates to a DC power supply product, in particular to a wide-range DC power supply with constant power output characteristics. Background technique [0002] At present, the maximum output power of conventional DC switching power supplies (or linear power supplies) on the market is equal to the product of the maximum output voltage and the maximum output current. In the electronic laboratory, it is necessary to test a variety of different products, and different products have different requirements for the output voltage and current of the DC power supply. Therefore, the current situation is that many laboratories need to purchase a variety of DC power supplies with different specifications or higher power to meet the test requirements of different voltages and currents. More cost is invested, more experimental space is wasted, and DC power supplies of different specifications or even brands need to be replaced when testing different pro...

AI Technical Summary

Problems solved by technology

It can be seen that if and only when the load meets the load characteristics of R2a, the power supply can output the maximum power. When the load becomes smaller (or larger), the operating current (or voltage) will be clamped at the maximum output current Imax (maximum output voltage Umax), the working voltage (or current) will become smaller, so that the power supply cannot reach the maximum output power, and the utilization rate will decrease

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