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CN-224233542-U - Synchronous rectification switching device of dual redundant power supply of industrial personal computer

CN224233542UCN 224233542 UCN224233542 UCN 224233542UCN-224233542-U

Abstract

The utility model belongs to the technical field of power supply switching devices, and discloses a synchronous rectification switching device of a dual-redundancy power supply of an industrial personal computer, which comprises a comparison circuit, a conversion circuit and a control circuit, wherein the comparison circuit is used for comparing the output voltage or primary current of the synchronous rectification circuit with a reference value and outputting a comparison result, the conversion circuit is used for converting a PWM signal output by a PWM chip into a PWM clock control signal, and the control circuit is connected with the comparison circuit and the conversion circuit and is used for controlling the synchronous rectification circuit to be started or stopped when the PWM signal is ended according to the comparison result and the PWM clock control signal.

Inventors

  • YAN JUN

Assignees

  • 深圳市跃飞工控智能科技有限公司

Dates

Publication Date
20260512
Application Date
20250609

Claims (7)

  1. 1. The synchronous rectification switching device of the dual-redundancy power supply of the industrial personal computer is characterized by comprising a comparison circuit, a conversion circuit and a control circuit, wherein the comparison circuit is used for comparing the output voltage or primary current of the synchronous rectification circuit with a reference value and outputting a comparison result, the conversion circuit is used for converting a PWM signal output by a PWM chip into a PWM clock control signal, and the control circuit is connected with the comparison circuit and the conversion circuit and used for controlling the synchronous rectification circuit to be started or stopped when the PWM signal is ended according to the comparison result and the PWM clock control signal.
  2. 2. The synchronous rectification switching device of the dual redundant power supply of the industrial personal computer according to claim 1, wherein the comparison circuit is a comparator (5), the comparator (5) comprises a first input end (13), a second input end (14) and a result output end (15), the first input end (13) is used for inputting an output voltage or a primary current of the synchronous rectification circuit, the second input end (14) is used for inputting the reference value, and the result output end (15) is used for outputting a comparison result of the output voltage or the primary current and the reference value.
  3. 3. The synchronous rectification switching device of the dual-redundancy power supply of the industrial personal computer according to claim 2, further comprising a first sampling circuit (3), wherein the first sampling circuit (3) is configured to detect an output voltage of the synchronous rectification circuit, convert the output voltage into a voltage signal, and send the voltage signal to the first input end (13).
  4. 4. The synchronous rectification switching device of the dual-redundancy power supply of the industrial personal computer according to claim 2, further comprising a second sampling circuit (4), wherein the second sampling circuit (4) is configured to sample a primary current signal of the synchronous rectification circuit to obtain a peak value of the primary current, and send the peak value of the primary current to the first input terminal (13).
  5. 5. The synchronous rectification switching device of an industrial personal computer dual-redundancy power supply according to claim 4, wherein the second sampling circuit (4) comprises a current transformer (10), and the current transformer (10) is used for detecting the current input by the synchronous rectification circuit.
  6. 6. The synchronous rectification switching device of the dual-redundancy power supply of the industrial personal computer according to claim 2, wherein the conversion circuit comprises an inverter (1), the inverter (1) is connected with a PWM chip (7), and the inverter (1) is used for converting the PWM signal into the PWM clock control signal.
  7. 7. The synchronous rectification switching device of the dual-redundancy power supply of the industrial personal computer according to claim 6, wherein the control circuit comprises a D trigger, and the D trigger (6) is connected with a control chip (2).

Description

Synchronous rectification switching device of dual redundant power supply of industrial personal computer Technical Field The utility model belongs to the technical field of power supply switching devices, and particularly relates to a synchronous rectification switching device of a dual-redundancy power supply of an industrial personal computer. Background In modern power electronics systems, power conversion efficiency is a critical indicator. Synchronous rectification technology is widely used in various circuits such as DC/DC converters and AC/DC converters as a method capable of remarkably improving power conversion efficiency. Under different load conditions, the traditional synchronous rectification circuit is difficult to always maintain an optimal working state, and in light load or no load, the synchronous rectification circuit may have a circulation phenomenon, so that extra energy loss is caused, and in heavy load, larger power loss is caused due to the conduction voltage drop of the rectification diode, so that the efficiency of the whole system is reduced. Disclosure of utility model In order to solve the above-mentioned shortcomings in the prior art, the present utility model provides a synchronous rectification switching device of dual redundant power supplies of an industrial personal computer, which is used for solving the problems in the background art. In order to solve the technical problems, the utility model adopts the following technical scheme: The synchronous rectification switching device of the dual-redundancy power supply of the industrial personal computer is characterized by comprising a comparison circuit, a conversion circuit and a control circuit, wherein the comparison circuit is used for comparing the output voltage or primary current of the synchronous rectification circuit with a reference value and outputting a comparison result, the conversion circuit is used for converting a PWM signal output by a PWM chip into a PWM clock control signal, and the control circuit is connected with the comparison circuit and the conversion circuit and used for controlling the synchronous rectification circuit to be started or stopped when the PWM signal is ended according to the comparison result and the PWM clock control signal. Preferably, the comparing circuit is a comparator, and the comparator includes a first input terminal, a second input terminal, and a result output terminal, where the first input terminal is used for inputting the output voltage or the primary current of the synchronous rectification circuit, the second input terminal is used for inputting the reference value, and the result output terminal is used for outputting a comparison result of the output voltage or the primary current and the reference value. Preferably, the synchronous rectification circuit further comprises a first sampling circuit, wherein the first sampling circuit is used for detecting output voltage of the synchronous rectification circuit, converting the output voltage into a voltage signal and sending the voltage signal to the first input end. Preferably, the circuit further comprises a second sampling circuit, wherein the second sampling circuit is used for sampling a primary current signal of the synchronous rectification circuit so as to acquire a peak value of the primary current, and the peak value of the primary current is sent to the first input end. Preferably, the second sampling circuit includes a current transformer for detecting a current input by the synchronous rectification circuit. Preferably, the conversion circuit includes an inverter connected to the PWM chip, the inverter being configured to convert the PWM signal into the PWM clock control signal. Preferably, the control circuit comprises a D flip-flop, and the D flip-flop is connected with a control chip. Compared with the prior art, the utility model has the following beneficial effects: when the load current is larger, the output voltage of the synchronous rectification circuit is higher, the comparison circuit detects that the output voltage or the input current is larger than the reference value, when the PWM signal is ended, the control circuit outputs an opening signal, the synchronous rectification circuit works normally, the rectification loss is reduced by utilizing the low on-resistance characteristic of the field effect transistor, and the power conversion efficiency is improved. When the load is gradually reduced and enters a light load or no-load state, the output voltage or input current of the synchronous rectification circuit is reduced to be smaller than a reference value, and when the PWM signal is ended, the control circuit outputs a closing signal, the synchronous rectification circuit stops working, the generation of a circulation phenomenon is avoided, and no-load loss is reduced. Drawings FIG. 1 is a schematic diagram of the overall structure of the present utility model; FIG. 2 is a specific circu