Switching power supply for AC/DC-DC self-adaptive instrument within ultra-wide voltage input range
An input range, ultra-wide voltage technology, applied in the direction of converting DC power input to DC power output, AC power input converting to DC power output, instruments, etc. And other issues
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[0029] Below in conjunction with accompanying drawing, the present invention will be further described.
[0030] The present invention adopts a two-stage conversion method, the first stage is a step-up conversion circuit, and the second stage is a flyback conversion circuit. Regardless of whether the input voltage is DC or AC, it passes through the rectification and filtering circuit. The sampling circuit samples the rectified and filtered voltage, and inputs the sampled value to the voltage comparator in the voltage detection and comparison control circuit, and then gates the first-stage boost conversion circuit through the switching circuit. That is, when the input voltage is 18-60VDC, the boost conversion circuit is turned on, and the input voltage in this range is boosted to 60VDC. When the input voltage is 60~100VDC or 85~265VAC, the switch tube in the boost conversion circuit is always turned off, and the input voltage in this range passes through the rectifier filter c...
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