Power supply discharging circuit and power supply system

Abstract

The utility model relates to the technical field of power supplies, and mainly provides a power supply discharge circuit and a power supply system, the power supply discharge circuit comprises a detection module, an acceleration module and a discharge module; the detection module is respectively connected with a port capacitor and the acceleration module, the acceleration module is connected with the port capacitor, and the discharge module is connected with the acceleration module in parallel; the detection module is used for detecting the capacitor voltage of the port capacitor and discharging the capacitor voltage through the discharging module when the capacitor voltage is greater than a preset voltage; and when the capacitor voltage is smaller than a preset voltage, a first control signal is output to the acceleration module to control the acceleration module to work, so that the acceleration module and the discharge module discharge the capacitor voltage at the same time, the discharge speed is increased, and the discharge efficiency of the power supply is improved. And power supply discharging is realized through a pure hardware circuit, so that the cost is reduced, and the reliability of the circuit is improved.

Description

[Technical field]

[0001] The utility model relates to the technical field of power supplies, and in particular to a power supply discharge circuit and a power supply system. [Background technology]

[0002] In the development and application of DC power supplies, the discharge method of the DC voltage at the output port has always been an important link that has attracted much attention. For a long time, there are two main widely used discharge methods. One is to connect a resistor in series with a digital switch. Although this solution can ensure high power efficiency, the use of digital switches leads to increased costs, complicated circuit structure, and poor anti-interference performance.

[0003] The second is to use a fixed resistor discharge method, the principle of which is to add a resistor at the output end to achieve rapid discharge, but this method has obvious defects, that is, the added resistance will cause the power supply to heat up seriously, resulting in low efficiency. In view of this, in order to overcome the shortcomings of the two existing discharge methods, it is necessary to propose a power supply discharge circuit. [Utility Model Content]

[0004] The embodiments of the utility model provide a power supply discharge circuit and a power supply system, aiming to solve the technical problems of high power supply discharge cost, low efficiency and low reliability in the prior art.

[0005] In order to solve the above technical problems, a technical solution adopted by the embodiment of the utility model is: providing a power supply discharge circuit, the power supply discharge circuit comprising a detection module, an acceleration module and a discharge module;

[0006] The detection module is connected to the port capacitor and the acceleration module respectively, the acceleration module is connected to the port capacitor, and the discharge module is connected to the acceleration module in parallel;

[0007] The detection module is used to detect the capacitor voltage of the port capacitor, and when the capacitor voltage is greater than a preset voltage, discharge the capacitor voltage through the discharge module; and

[0008] When the capacitor voltage is less than a preset voltage, a first control signal is output to the acceleration module to control the acceleration module to work and discharge the capacitor voltage simultaneously with the discharge module.

[0009] Optionally, the detection module includes a detection unit and a control unit;

[0010] The detection unit is connected to the port capacitor, and the detection unit is also connected to the control unit, and the control unit is respectively connected to the port capacitor and the acceleration module;

[0011] The detection unit is used to detect the capacitor voltage of the port capacitor, and when the capacitor voltage is greater than a preset voltage, control the control unit to output a second control signal to the acceleration module to control the acceleration module to stop working, and the capacitor voltage is discharged by the discharge module; and

[0012] When the capacitor voltage is less than a preset voltage, the control unit is controlled to output a first control signal to the acceleration module to control the acceleration module to work, thereby discharging the capacitor voltage simultaneously with the discharge module.

[0013] Optionally, the detection unit includes a voltage regulator tube D1, a resistor R3 and a resistor R5;

[0014] The cathode of the voltage regulator tube D1 is connected to the port capacitor, the anode of the voltage regulator tube D1 is connected to the control unit through the resistor R3, the resistor R3 is also connected to the resistor R5, and the resistor R5 is also used for grounding.

[0015] Optionally, the control unit includes a resistor R1 and a switch tube Q2;

[0016] The control end of the switch tube Q2 is connected to the resistor R3, the first end of the switch tube Q2 is connected to the port capacitor through the resistor R1, the first end of the switch tube Q2 is also connected to the acceleration module, and the second end of the switch tube Q2 is used for grounding.

[0017] Optionally, the acceleration module includes a switch tube Q1 and a resistor R2;

[0018] The control end of the switch tube Q1 is connected to the detection module, the first end of the switch tube Q1 is connected to the port capacitor through the resistor R2, and the second end of the switch tube Q1 is used for grounding.

[0019] Optionally, the power supply discharge circuit further includes a clamping module;

[0020] The clamping module is connected to the acceleration module.

[0021] Optionally, the clamping module is a voltage regulator tube D2;

[0022] The cathode of the voltage regulator tube D2 is connected to the control end of the switch tube Q1, and the anode of the voltage regulator tube D2 is grounded.

[0023] Optionally, the discharge module is a resistor R4;

[0024] A first end of the resistor R4 is connected to the port capacitor, and a second end of the resistor R4 is grounded.

[0025] Optionally, the switch tube Q2 is a semiconductor triode, and the switch tube Q1 is a field effect transistor.

[0026] In order to solve the above technical problems, another technical solution adopted by the embodiment of the utility model is: to provide a power supply system, the power supply system comprising:

[0027] Port capacitance;

[0028] Power supply; and

[0029] In the power supply discharge circuit as described above, the port capacitor is connected to the power supply and the power supply discharge circuit respectively.

[0030] Different from the related art, the utility model provides a power supply discharge circuit and a power supply system, wherein the power supply discharge circuit includes a detection module, an acceleration module and a discharge module; the detection module is connected to the port capacitor and the acceleration module respectively, the acceleration module is connected to the port capacitor, and the discharge module is connected in parallel with the acceleration module; the detection module is used to detect the capacitor voltage of the port capacitor, and when the capacitor voltage is greater than a preset voltage, the capacitor voltage is discharged through the discharge module; and when the capacitor voltage is less than a preset voltage, a first control signal is output to the acceleration module to control the acceleration module to work, thereby discharging the capacitor voltage simultaneously with the discharge module to speed up the discharge speed, thereby improving the efficiency of power supply discharge. And the power supply discharge is realized by a pure hardware circuit, which not only reduces the cost, but also improves the reliability of the circuit.

Brief Description of the Drawings

[0031] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0032] Figure 1 It is a structural block diagram of a power supply system provided by an embodiment of the utility model;

[0033] Figure 2 It is a structural block diagram of a power supply discharge circuit provided by an embodiment of the utility model;

[0034] Figure 3 The utility model provides a circuit diagram of a power supply discharge circuit. [Specific implementation method]

[0035] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0036] The technical features involved in the various embodiments of the present application described below do not conflict with each other and can be combined with each other.

[0037] When an element is referred to as being “connected to” another element, it can be directly connected to the other element, or one or more intervening elements may be present therebetween.

[0038] The terms "first", "second", etc. in the specification and claims of the present utility model are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more.

[0039] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not used to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0040] See also Figure 1 , Figure 1 is a structural block diagram of a power supply system provided by an embodiment of the utility model, such as Figure 1 As shown, the power supply system 100 includes a power supply 10, a port capacitor C1 and a power supply discharge circuit 20; the port capacitor C1 is connected to the power supply 10 and the power supply discharge circuit 20 respectively. The power supply system 100 also includes a load 30 (not shown), and the load 30 is connected to the power supply 10. The load 30 is used to receive the output voltage of the power supply 10 and start working based on the output voltage. When the power supply 10 supplies power to the load 30, the port capacitor C1 will also store the output voltage of the power supply 10. When the power supply 10 loses power, it is necessary to quickly discharge the residual power (the voltage stored in the port capacitor C1) to ensure that the power supply circuit can restart normally.

[0041] Specifically, when the power supply 10 loses power, the power supply discharge circuit 20 detects the capacitor voltage of the port capacitor C1, and when there is residual power on the port capacitor C1, the capacitor voltage on the port capacitor C1 is discharged to ensure that the power supply circuit can be restarted. It should be noted that in some scenarios where the power supply needs to be switched on and off quickly and repeatedly, after the switch of the power supply 10 is disconnected, the voltage on the load circuit will drop slowly due to the presence of the port capacitor C1. If the power is turned on again when the port capacitor C1 is not completely powered off, the power supply circuit may not be reset and started normally, and then the power-on freeze may occur. Therefore, by setting the power supply discharge circuit 20, the residual power in the port capacitor C1 can be quickly discharged, thereby ensuring that the power supply circuit can be restarted normally.

[0042] For further information, see Figure 2 , Figure 2 is a structural block diagram of a power supply discharge circuit provided by an embodiment of the utility model, such as Figure 2 As shown, the power supply discharge circuit 20 includes a detection module 21, an acceleration module 22 and a discharge module 23;

[0043] The detection module 21 is connected to the port capacitor C1 and the acceleration module 22 respectively, the acceleration module 22 is connected to the port capacitor C1, and the discharge module 23 is connected in parallel with the acceleration module 22;

[0044] The detection module 21 is used to detect the capacitor voltage of the port capacitor C1, and when the capacitor voltage is greater than a preset voltage, discharge the capacitor voltage through the discharge module 23; and

[0045] When the capacitor voltage is less than a preset voltage, a first control signal is output to the acceleration module 22 to control the acceleration module 22 to work and discharge the capacitor voltage simultaneously with the discharge module 23 .

[0046] Specifically, when the power supply 10 loses power, the capacitor voltage stored on the port capacitor C1 needs to be discharged quickly. At this time, the detection module 21 will determine whether the capacitor voltage on the port capacitor C1 exceeds the preset voltage. If the capacitor voltage exceeds the preset voltage, the acceleration module 22 is controlled to stop working so that the discharge module 23 discharges the capacitor voltage alone. When the capacitor voltage is lower than the preset voltage, the first control signal is output to control the acceleration module 22 to work, so that the acceleration module 22 and the discharge module 23 discharge the capacitor voltage at the same time, thereby accelerating the discharge speed, so that the capacitor voltage can be quickly discharged, thereby avoiding the situation of serious heating of the power supply caused by the resistor, and improving the efficiency of power supply discharge. It should be noted that when the capacitor voltage is greater than the preset voltage, if the acceleration module 22 also participates in the discharge, it will cause the port capacitor C1 to release huge energy in a very short time, thereby causing a safety accident. Therefore, the working state of the acceleration module 22 is controlled by setting the preset voltage, thereby ensuring that the port capacitor C1 discharges slowly, thereby improving the safety of the circuit.

[0047] In some embodiments, Figure 2 As shown, the detection module 21 includes a detection unit 211 and a control unit 212; the detection unit 211 is connected to the port capacitor C1, the detection unit 211 is also connected to the control unit 212, and the control unit 212 is respectively connected to the port capacitor C1 and the acceleration module 22;

[0048] The detection unit 211 is used to detect the capacitor voltage of the port capacitor C1, and when the capacitor voltage C1 is greater than a preset voltage, control the control unit 212 to output a second control signal to the acceleration module 22 to control the acceleration module 22 to stop working, and the capacitor voltage is discharged by the discharge module 23; and

[0049] When the capacitor voltage is less than a preset voltage, the control unit 212 is controlled to output a first control signal to the acceleration module 22 to control the acceleration module 22 to work, thereby discharging the capacitor voltage simultaneously with the discharge module 23 .

[0050] In yet another embodiment, see Figure 3 , Figure 3 is a circuit diagram of a power supply discharge circuit provided by an embodiment of the utility model, such as Figure 3 As shown, the detection unit 211 includes a voltage regulator tube D1, a resistor R3 and a resistor R5; the control unit 212 includes a resistor R1 and a switch tube Q2;

[0051] The cathode of the voltage regulator tube D1 is connected to the port capacitor C1, and the anode of the voltage regulator tube D1 is connected to the control unit 212 through the resistor R3. The resistor R3 is also connected to the resistor R5, and the resistor R5 is also used for grounding.

[0052] The control end of the switch tube Q2 is connected to the resistor R3, the first end of the switch tube Q2 is connected to the port capacitor C1 through the resistor R1, the first end of the switch tube Q2 is also connected to the acceleration module 22, and the second end of the switch tube Q2 is used for grounding.

[0053] Specifically, when the power supply 10 loses power, the voltage regulator D1 detects the capacitor voltage of the port capacitor C1. If the capacitor voltage exceeds the voltage regulation value of the voltage regulator D1, the voltage regulator D1 is broken down. When the voltage regulator D1 is broken down, the capacitor voltage is divided by the voltage regulator D1, the resistor R2 and the resistor R5, so that the switch Q2 is turned on. When the switch Q2 is turned on, the voltage at the second end of the resistor R1 is pulled down, so that the acceleration module 22 stops working, and the capacitor voltage is only discharged through the discharge module 23. Among them, the preset voltage is set according to the voltage regulation value of the voltage regulator D1.

[0054] When the capacitor voltage is lower than the voltage stabilization value of the voltage regulator tube D1, the voltage regulator tube D1 cannot be broken down, so that the switch tube Q2 is turned off. After the switch tube Q2 is turned off, the capacitor voltage is input to the control end of the acceleration module 22 through the resistor R1, so that the acceleration module 22 starts to work. When the acceleration module 22 starts to work, the capacitor voltage can be discharged simultaneously through the acceleration module 22 and the discharge module 23.

[0055] In yet another embodiment, Figure 3 As shown, the acceleration module 22 includes a switch tube Q1 and a resistor R2;

[0056] The control end of the switch tube Q1 is connected to the detection module 21 , the first end of the switch tube Q1 is connected to the port capacitor C1 through the resistor R2 , and the second end of the switch tube Q1 is grounded.

[0057] Specifically, when the switch tube Q2 is turned on, the voltage at the second end of the resistor R1 is pulled down, so that the control end of the switch tube Q1 is cut off due to receiving a low level (a second control signal). When the switch tube Q1 is cut off, the capacitor voltage can only be discharged through the discharge module 23.

[0058] When the switch tube Q2 is turned off, the capacitor voltage is output to the control end of the switch tube Q1 through the resistor R1 (that is, the first control signal), so that the switch tube Q1 is turned on. When the switch tube Q1 is turned on, the capacitor voltage is also discharged through the resistor R2 and the switch tube Q1, thereby accelerating the discharge speed.

[0059] In some embodiments, the switch tube Q2 is a semiconductor triode, and the switch tube Q1 is a field effect transistor.

[0060] Further, in another embodiment, if Figure 2 As shown, the power supply discharge circuit 20 further includes a clamping module 24 ; the clamping module 24 is connected to the acceleration module 22 .

[0061] Among them, Figure 3 As shown, the clamping module 24 is a voltage regulator tube D2;

[0062] The cathode of the voltage regulator tube D2 is connected to the control end of the switch tube Q1, and the anode of the voltage regulator tube D2 is used for grounding. Specifically, the voltage regulator tube D2 is mainly used to protect the switch tube Q1 from being damaged when the capacitor voltage of the port capacitor C1 is too large. Specifically, when the capacitor voltage is too large, that is, when the capacitor voltage is greater than the voltage stabilization value of the voltage regulator tube D2, the voltage regulator tube D2 is broken down. At this time, the control end and the second end voltage of the switch tube Q1 are limited to the voltage stabilization value of the voltage regulator tube D2, thereby protecting the switch tube Q1.

[0063] In yet another embodiment, Figure 3 As shown, the discharge module 23 is a resistor R4; the first end of the resistor R4 is connected to the port capacitor C1, and the second end of the resistor R4 is used for grounding. Specifically, the resistor R4 is a fixed discharge resistor. When the capacitor voltage of the port capacitor C1 is greater than the preset voltage, the switch tube Q2 is turned on, the switch tube Q1 is turned off, and the capacitor voltage is discharged through the resistor R4; when the capacitor voltage is less than the preset voltage, the switch tube Q2 is turned off, and the switch tube Q1 is turned on, so that the resistor R2 and the resistor R4 are discharged at the same time. Based on this, the coordination between the resistor and the switch tube can avoid the use of devices such as digital switches, so that the residual electricity can be quickly discharged after the power supply is powered off, thereby reducing the cost of power supply discharge.

[0064] It should be noted that the resistance of the resistor R4 and the resistance of the resistor R1 are much greater than the resistance of the resistor R2. When the switch tube Q2 is turned on, although the resistor R1 and the switch tube Q2 also form a loop, due to the large resistance of the resistor R1, the resistance of the resistor R1 and the resistor R4 in parallel is also large, so the discharge speed of the port capacitor C1 is still relatively slow. When the switch tube Q1 is turned on, the resistor R2 is connected in parallel with the resistor R4, and since the resistance of the resistor R2 is small, the total resistance after parallel connection is also small, so that the capacitor voltage can be quickly discharged.

[0065] The utility model provides a power supply discharge circuit, which includes a detection module, an acceleration module and a discharge module; the detection module is connected to the port capacitor and the acceleration module respectively, the acceleration module is connected to the port capacitor, and the discharge module is connected in parallel with the acceleration module; the detection module is used to detect the capacitor voltage of the port capacitor, and when the capacitor voltage is greater than a preset voltage, the capacitor voltage is discharged through the discharge module; and when the capacitor voltage is less than the preset voltage, a first control signal is output to the acceleration module to control the acceleration module to work, so as to discharge the capacitor voltage simultaneously with the discharge module to speed up the discharge speed, thereby improving the efficiency of power supply discharge. And the power supply discharge is realized by a pure hardware circuit, which not only reduces the cost, but also improves the reliability of the circuit.

[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Under the idea of ​​the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A power supply discharge circuit, characterized in that: The power supply discharge circuit includes a detection module, an acceleration module and a discharge module; The detection module is connected to the port capacitor and the acceleration module respectively, the acceleration module is connected to the port capacitor, and the discharge module is connected to the acceleration module in parallel; The detection module is used to detect the capacitor voltage of the port capacitor, and when the capacitor voltage is greater than a preset voltage, discharge the capacitor voltage through the discharge module; as well as When the capacitor voltage is less than a preset voltage, a first control signal is output to the acceleration module to control the acceleration module to work and discharge the capacitor voltage simultaneously with the discharge module.

2. The power supply discharge circuit according to claim 1, characterized in that: The detection module includes a detection unit and a control unit; The detection unit is connected to the port capacitor, and the detection unit is also connected to the control unit, and the control unit is respectively connected to the port capacitor and the acceleration module; The detection unit is used to detect the capacitor voltage of the port capacitor, and when the capacitor voltage is greater than a preset voltage, control the control unit to output a second control signal to the acceleration module to control the acceleration module to stop working, and the capacitor voltage is discharged by the discharge module; as well as When the capacitor voltage is less than a preset voltage, the control unit is controlled to output a first control signal to the acceleration module to control the acceleration module to work, thereby discharging the capacitor voltage simultaneously with the discharge module.

3. The power supply discharge circuit according to claim 2, characterized in that: The detection unit includes a voltage regulator tube D1, a resistor R3 and a resistor R5; The cathode of the voltage regulator tube D1 is connected to the port capacitor, the anode of the voltage regulator tube D1 is connected to the control unit through the resistor R3, the resistor R3 is also connected to the resistor R5, and the resistor R5 is also used for grounding.

4. The power supply discharge circuit according to claim 3, characterized in that: The control unit includes a resistor R1 and a switch tube Q2; The control end of the switch tube Q2 is connected to the resistor R3, the first end of the switch tube Q2 is connected to the port capacitor through the resistor R1, the first end of the switch tube Q2 is also connected to the acceleration module, and the second end of the switch tube Q2 is used for grounding.

5. The power supply discharge circuit according to claim 4, characterized in that: The acceleration module includes a switch tube Q1 and a resistor R2; The control end of the switch tube Q1 is connected to the detection module, the first end of the switch tube Q1 is connected to the port capacitor through the resistor R2, and the second end of the switch tube Q1 is used for grounding.

6. The power supply discharge circuit according to claim 5, characterized in that: The power supply discharge circuit also includes a clamping module; The clamping module is connected to the acceleration module.

7. The power supply discharge circuit according to claim 6, characterized in that: The clamping module is a voltage regulator tube D2; The cathode of the voltage regulator tube D2 is connected to the control end of the switch tube Q1, and the anode of the voltage regulator tube D2 is grounded.

8. The power supply discharge circuit according to any one of claims 1 to 7, characterized in that: The discharge module is a resistor R4; A first end of the resistor R4 is connected to the port capacitor, and a second end of the resistor R4 is grounded.

9. The power supply discharge circuit according to any one of claims 5 to 7, characterized in that: The switch tube Q2 is a semiconductor triode, and the switch tube Q1 is a field effect transistor.

10. A power supply system, characterized in that: The power supply system comprises: Port capacitance; Power supply; and The power supply discharge circuit according to any one of claims 1 to 9, wherein the port capacitor is connected to the power supply and the power supply discharge circuit respectively.

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