High-reliability DC-DC switching power supply formed by discrete members
A technology of switching power supply and discrete components, which is applied in the field of high reliability DC/DC switching power supply, can solve the problems of high development cost, difficult reduction of ripple, long development cycle, etc., and achieve light weight, high conversion efficiency and small volume Effect
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[0013] in figure 1 Among them, the high-reliability DC / DC switching power supply composed of discrete components is composed of a power main loop and a control loop. The power main loop includes input filter, power switch, transformer, output rectifier filter, and the control loop includes sampling isolation circuit and PWM control circuit.
[0014] in figure 2 The input filter circuit has two functions: one is to prevent input noise, and the other is to control the noise generated by the switching power supply and fed back to the input power supply. It is mainly composed of conjugate filter coil L1, polar capacitor C1 and non-polar capacitor C2 and C3. One thing to note here is: non-polar capacitors are best placed close to the voltage input end of the transformer.
[0015] in image 3 In the output rectifier filter circuit, the AC signal output by the transformer is converted into a DC signal. Two Schottky rectifier tubes V1 and V2 are used in the circuit to form a full-wave r...
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