Wide-range high-precision low-noise automatic range direct current power source
An auto-ranging, DC power supply technology, applied in the direction of converting DC power input to DC power output, electrical components, adjusting electrical variables, etc., which can solve the inconvenience of frequent power replacement, narrow voltage/current range, and difficult to predict tests. requirements, etc.
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[0031] Preferred embodiments of the present invention will be described in detail below according to the accompanying drawings.
[0032] Example figure 1 , figure 2 and image 3 As shown, this embodiment provides a wide-range, high-precision, low-noise automatic range DC power supply, including a pre-stage switching power supply, a CPU control circuit and a step-down circuit. The switching power supply adopts a conventional switching power supply, or a conventional linear Power supply, the rated power of conventional switching power supply is 1200W; the CPU control circuit includes electronic load reference voltage circuit, voltage divider resistors R1, R2, R3, triode Q3, PWM state comparator 4, state comparison level terminal, electronic load enable signal Terminal, current error amplifier 1 and voltage error amplifier 2; the step-down circuit includes MOS tube Q1, diode D1, energy storage inductor L1, load resistor R4, current sampling resistor R5, capacitor C3, output ca...
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