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

Active Publication Date: 2014-09-03
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] (3) How to choose the circuit startup mode, how to eliminate the efficiency drop caused by the bleeder resistor and the detection resistor
The common problem in modern switching power supplies is that the starting circuit, bleeder resistor and sense resistor consume power all the time

Method used

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  • Switching power supply for AC/DC-DC self-adaptive instrument within ultra-wide voltage input range
  • Switching power supply for AC/DC-DC self-adaptive instrument within ultra-wide voltage input range
  • Switching power supply for AC/DC-DC self-adaptive instrument within ultra-wide voltage input range

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Embodiment Construction

[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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Abstract

The invention discloses a switching power supply for an AC/DC-DC self-adaptive instrument within an ultra-wide voltage input range. The switching power supply comprises an input protective circuit, an EMI filter circuit, a power frequency rectification and filter circuit, a high frequency rectification and filter circuit, a boosting conversion circuit, a flyback conversion circuit, a first voltage sampling circuit, a first current sampling circuit, a second voltage sampling circuit, a second current sampling circuit, a first PWM circuit, a second PWM circuit, an auxiliary power supply circuit, a power switching circuit, a voltage detection and comparison control circuit and an optocoupler isolation feedback circuit. A two-stage type cascade circuit is formed by the boosting conversion circuit and the flyback conversion circuit, and the automatic instrument can automatically adapt to power supply of an 85-265V alternating-current power supply and an 18-100V direct-current power supply.

Description

technical field [0001] The invention belongs to the field of instrument power supplies, and is a switching power supply for ultra-wide voltage input range AC / DC-DC self-adaptive instruments. Background technique [0002] The power supply system of the automation instrument produced by the international famous instrument company can automatically adapt to the power supply of 85~265V AC and 18~100V DC power supply, that is, the power connector of these instruments can be plugged into the DC power supply or the AC power supply, and they can work normally. This brings great convenience to users, and also greatly reduces the damage of automation instruments caused by improper power supply. However, domestic automatic instruments do not have this function. Therefore, in industrial field applications, it is necessary to configure different power modules according to whether the field provides 24V DC power supply or 220V AC power supply. If the automatic instrument suitable for 24...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217H02M3/335
Inventor 徐科军蒋荣慰方敏
Owner HEFEI UNIV OF TECH
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