Synchronous rectification switching device for dual redundant power supplies of industrial personal computer

Abstract

The utility model belongs to the technical field of power supply switching devices, and discloses a synchronous rectification switching device for dual redundant power supplies of an industrial personal computer, which comprises a comparison circuit, a conversion circuit and a control circuit, and is characterized in that the comparison circuit is used for comparing the output voltage or primary current of a synchronous rectification circuit with a reference value and outputting a comparison result; the comparison circuit is used for comparing a PWM signal output by a PWM chip, the conversion circuit is used for converting the PWM signal output by the 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 turned on or turned off according to the comparison result and the PWM clock control signal when the PWM signal ends.

Description

Technical Field

[0001] This utility model belongs to the technical field of power switching devices, specifically relating to a synchronous rectification switching device for dual redundant power supplies of industrial control computers. Background Technology

[0002] In modern power electronic systems, power conversion efficiency is a crucial indicator. Synchronous rectification technology, as a method that can significantly improve power conversion efficiency, is widely used in various DC / DC converters, AC / DC converters, and other circuits. Traditional synchronous rectification circuits struggle to maintain optimal operating conditions under different load conditions. Under light or no-load conditions, circulating currents may occur in synchronous rectification circuits, leading to additional energy losses. Under heavy load conditions, the forward voltage drop of the rectifier diodes also causes significant power losses, reducing the overall system efficiency. Utility Model Content

[0003] In view of the above-mentioned shortcomings in the prior art, this utility model provides a synchronous rectification and switching device for dual redundant power supplies of industrial control computers to solve the problems in the background art.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A synchronous rectification switching device for a dual redundant power supply of an industrial control computer is characterized by comprising a comparison circuit, a conversion circuit, and a control circuit. The comparison circuit is used to compare the output voltage or primary current of the synchronous rectification circuit with a reference value and output the comparison result. The conversion circuit is used to convert the PWM signal output by the PWM chip into a PWM clock control signal. The control circuit is connected to the comparison circuit and the conversion circuit and is used to control the synchronous rectification circuit to turn on or off when the PWM signal ends, based on the comparison result and the PWM clock control signal.

[0006] Preferably, the comparison circuit is a comparator, which includes a first input terminal, a second input terminal, and a result output terminal. The first input terminal is used to input the output voltage or primary current of the synchronous rectifier circuit, the second input terminal is used to input the reference value, and the result output terminal is used to output the comparison result between the output voltage or primary current and the reference value.

[0007] Preferably, it further includes a first sampling circuit, which is used to detect the output voltage of the synchronous rectifier circuit and convert the output voltage into a voltage signal and send it to the first input terminal.

[0008] Preferably, the circuit further includes a second sampling circuit, which is used to sample the primary current signal of the synchronous rectifier circuit to obtain the peak value of the primary current and send the peak value of the primary current to the first input terminal.

[0009] Preferably, the second sampling circuit includes a current transformer for detecting the current input by the synchronous rectifier circuit.

[0010] Preferably, the conversion circuit includes an inverter connected to a PWM chip, the inverter being used to convert the PWM signal into the PWM clock control signal.

[0011] Preferably, the control circuit includes a D flip-flop, which is connected to a control chip.

[0012] Compared with the prior art, this utility model has the following advantages:

[0013] When the load current is large, the output voltage of the synchronous rectifier circuit is high. At this time, the comparator circuit detects that the output voltage or input current is greater than the reference value. When the PWM signal ends, the control circuit outputs an enable signal, and the synchronous rectifier circuit operates normally. Utilizing the low on-resistance characteristic of the MOSFET, rectification losses are reduced, and power conversion efficiency is improved. When the load gradually decreases, entering a light-load or no-load state, the output voltage or input current of the synchronous rectifier circuit drops below the reference value. When the PWM signal ends, the control circuit outputs a disable signal, and the synchronous rectifier circuit stops working, avoiding circulating current and thus reducing no-load losses. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 A detailed circuit diagram of the comparison circuit provided by this utility model;

[0016] Figure 3 Specific circuit diagram of the first sampling circuit provided by this utility model;

[0017] Figure 4 A detailed circuit diagram of the second sampling circuit provided by this utility model;

[0018] The reference numerals in the accompanying drawings include: inverter 1, control chip 2, first sampling circuit 3, second sampling circuit 4, comparator 5, D flip-flop 6, PWM chip 7, current transformer 10, first input terminal 13, second input terminal 14, and result output terminal 15. Detailed Implementation

[0019] To enable those skilled in the art to better understand this utility model, the technical solution of this utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0020] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0021] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0022] In the description of this utility model, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating the connection relationship between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] Example 1:

[0024] like Figure 1-4The synchronous rectification switching device for a dual redundant power supply of an industrial control computer, as shown, includes a comparator 5, a conversion circuit, and a control circuit. In the synchronous rectification circuit, the first input terminal 13 of the comparator 5 obtains the output voltage or primary current signal of the synchronous rectification circuit through the first sampling circuit 3 or the second sampling circuit 4. The second input terminal 14 is connected to a pre-set reference value. The inverter 1 of the conversion circuit has its PWM signal input terminal connected to the PWM chip 7, converting the PWM signal into a PWM clock control signal and outputting it to the CLK input terminal of the D flip-flop 6 of the control circuit. The D input terminal of the D flip-flop 6 is connected to the result output terminal 15 of the comparator 5, and the control signal terminal is connected to the control chip 2 of the synchronous rectification circuit. When the synchronous rectification circuit is working, the comparator 5 continuously compares the output voltage or input current of the synchronous rectification circuit with the reference value and outputs the comparison result to the D input terminal of the D flip-flop 6 of the control circuit. Simultaneously, the PWM signal output by the PWM chip 7 is converted into a PWM clock control signal by the conversion circuit and input to the clock signal input terminal of the D flip-flop 6. At the end of the PWM signal, the D flip-flop 6 outputs a control signal based on the comparison result and the PWM clock control signal. If the output voltage or primary current is greater than the reference value, the D flip-flop 6 outputs an enable signal. After receiving the enable signal, the control chip 2 of the synchronous rectification circuit controls the field-effect transistor to turn on and start synchronous rectification. If the output voltage or primary current is less than the reference value, the D flip-flop outputs a disable signal. After receiving the disable signal, the control chip 2 controls the field-effect transistor to turn off and stop synchronous rectification. The second sampling circuit 4 includes a current transformer 10, which is used to detect the current input by the synchronous rectification circuit.

[0025] Working principle:

[0026] When the load current is large, the output voltage of the synchronous rectifier circuit is high. At this time, comparator 5 detects that the output voltage or input current is greater than the reference value. When the PWM signal ends, the control circuit outputs an enable signal, and the synchronous rectifier circuit operates normally. Utilizing the low on-resistance characteristic of the MOSFET, rectification losses are reduced and power conversion efficiency is improved. When the load gradually decreases and enters a light load or no-load state, the output voltage or input current of the synchronous rectifier circuit drops below the reference value. When the PWM signal ends, the control circuit outputs a disable signal, and the synchronous rectifier circuit stops working, avoiding the generation of circulating current and thus reducing no-load losses.

[0027] The above are merely embodiments of this utility model. The circuits, electronic components, and modules involved are all prior art, fully achievable by those skilled in the art, and require no further explanation. The content protected by this application does not involve improvements to the software or methods. Commonly known structures and characteristics in the solution are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field to which this utility model pertains prior to the application date or priority date, are able to access all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in conjunction with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent.

Claims

1. A synchronous rectification and switching device for dual redundant power supplies of an industrial control computer, characterized in that: It includes a comparison circuit, a conversion circuit, and a control circuit. The comparison circuit is used to compare the output voltage or primary current of the synchronous rectifier circuit with a reference value and output the comparison result. The conversion circuit is used to convert the PWM signal output by the PWM chip into a PWM clock control signal. The control circuit is connected to the comparison circuit and the conversion circuit and is used to control the synchronous rectifier circuit to turn on or off when the PWM signal ends, based on the comparison result and the PWM clock control signal.

2. The synchronous rectification and switching device for dual redundant power supplies of an industrial control computer according to claim 1, characterized in that, The comparison circuit is a comparator (5), which includes a first input terminal (13), a second input terminal (14), and a result output terminal (15). The first input terminal (13) is used to input the output voltage or primary current of the synchronous rectifier circuit, the second input terminal (14) is used to input the reference value, and the result output terminal (15) is used to output the comparison result between the output voltage or primary current and the reference value.

3. The synchronous rectification and switching device for dual redundant power supplies of an industrial control computer according to claim 2, characterized in that, It also includes a first sampling circuit (3), which is used to detect the output voltage of the synchronous rectifier circuit and convert the output voltage into a voltage signal and send it to the first input terminal (13).

4. The synchronous rectification and switching device for dual redundant power supplies of an industrial control computer according to claim 2, characterized in that, It also includes a second sampling circuit (4), which is used to sample the primary current signal of the synchronous rectifier circuit to obtain the peak value of the primary current and send the peak value of the primary current to the first input terminal (13).

5. The synchronous rectification and switching device for dual redundant power supplies of an industrial control computer according to claim 4, characterized in that, The second sampling circuit (4) includes a current transformer (10) for detecting the current input by the synchronous rectifier circuit.

6. The synchronous rectification and switching device for dual redundant power supplies of an industrial control computer according to claim 2, characterized in that, The conversion circuit includes an inverter (1) connected to a PWM chip (7), and the inverter (1) is used to convert the PWM signal into the PWM clock control signal.

7. The synchronous rectification and switching device for dual redundant power supplies of an industrial control computer according to claim 6, characterized in that, The control circuit includes a D flip-flop, and the D flip-flop (6) is connected to a control chip (2).

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