Circuit capable of expanding switching power supply output range and improving output characteristic
A technology of output range and output characteristics, applied in the direction of output power conversion device, DC power input conversion to DC power output, electrical components, etc.
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[0029] Preferred embodiments of the present invention will be described in detail below according to the accompanying drawings.
[0030] Example figure 1 and figure 2 As shown, this embodiment provides a circuit for expanding the output range of the switching power supply and improving the output characteristics, including a CPU control circuit and a step-down circuit. The CPU control circuit includes an electronic load reference voltage circuit, voltage dividing resistors R1, R2, and R3 , a transistor Q3, a PWM state comparator 4, a state comparison level terminal, an electronic load enable signal terminal, a current error amplifier 1 and a voltage error amplifier 2; the step-down circuit includes a MOS transistor Q1, a diode D1, an energy storage inductor L1, Load resistor R4, current sampling resistor R5, capacitor C3, output capacitor C2, absorbing capacitor C1, drive circuit, PWM circuit and electronic load.
[0031] The drain of the MOS transistor Q1 is connected to t...
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