A module power supply quick discharge circuit

Abstract

The utility model discloses a module power supply quick discharge circuit relates to the technical field of discharge circuit, including module power supply, and the output negative pole and output positive pole of module power supply have the output capacitor in parallel, and the output capacitor has first circuit, second circuit and third circuit in parallel, and first resistance and second resistance have the series connection on first circuit, and third resistance and first NPN triode have the series connection on second circuit, and the base of first NPN triode is connected at first circuit, and discharge resistance and PNP triode have the series connection on third circuit, and the second NPN triode is connected between PNP triode and second circuit. The utility model discloses can let module power supply automatic quick discharge, and need not extra control signal, solves the problem that direct parallel discharge resistance power dissipation is too big or control discharge circuit is complicated.

Description

Technical Field

[0001] This utility model belongs to the field of discharge circuit technology, specifically relating to a fast discharge circuit for a modular power supply. Background Technology

[0002] To ensure stable operation, a large capacitor is typically connected in parallel at the module's power output. This causes the voltage across the output capacitor to remain constant for a period of time after the module stops working. In some applications, it is required that the voltage across this capacitor decrease rapidly. This is usually addressed by connecting a direct discharge resistor in parallel across the output capacitor, as shown in the attached diagram. Figure 1 As shown, the discharge resistor is connected to the circuit as shown in the attached diagram via a control switch (relay or power device). Figure 2 As shown. With this direct parallel resistor, the resistor will dissipate power during module power supply operation; therefore, the resistance value cannot be too low, while a larger resistance value will increase the discharge time. Connecting the discharge resistor through a control switch (relay or power device) requires adding a control circuit and its own power supply circuit, significantly increasing system size and cost, and is difficult to implement without an external power supply. Therefore, our company has designed and proposed a fast discharge circuit for module power supplies. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies, such as excessive power consumption from directly connected parallel discharge resistors or complex control discharge circuits, by proposing a fast discharge circuit for modular power supplies. This fast discharge circuit enables automatic and rapid discharge without the need for additional control signals.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: Design a fast discharge circuit for a modular power supply, including a modular power supply. An output capacitor is connected in parallel to the negative and positive terminals of the output of the modular power supply. A first circuit, a second circuit, and a third circuit are connected in parallel to the output capacitor. A first resistor and a second resistor are connected in series in the first circuit. A third resistor and a first NPN transistor are connected in series in the second circuit, with the base of the first NPN transistor connected to the first circuit. A discharge resistor and a PNP transistor are connected in series in the third circuit, with a second NPN transistor connected between the PNP transistor and the second circuit.

[0005] Furthermore, the base of the first NPN transistor is connected between the first resistor and the second resistor, the collector of the first NPN transistor is connected to the third resistor, and the emitter of the first NPN transistor is connected to the negative output terminal of the module power supply.

[0006] Furthermore, the base of the second NPN transistor is connected to the collector of the first NPN transistor, the collector of the second NPN transistor is connected to the base of the PNP transistor, and the emitter of the second NPN transistor is connected to the negative output terminal of the module power supply.

[0007] Furthermore, the collector of the PNP transistor is connected to the discharge resistor, and the emitter of the PNP transistor is connected to the negative output terminal of the module power supply.

[0008] The present invention provides a fast discharge circuit for a modular power supply, which has the following advantages: the modular power supply can automatically and quickly discharge without the need for additional control signals, thus solving the problems of excessive power consumption of directly connected parallel discharge resistors or complex control discharge circuits. Attached Figure Description

[0009] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of a direct discharge resistor connected in parallel across the output capacitor of an existing module power supply. Figure 2 This is a schematic diagram showing that the two ends of the output capacitor of the existing module power supply are connected to a discharge resistor through a control switch; Figure 3 This is a schematic diagram of the circuit structure of this utility model; The following are labeled in the diagram: 1. Module power supply; 2. Output capacitor; 3. Discharge resistor; 4. First resistor; 5. Second resistor; 6. Third resistor; 7. First NPN transistor; 8. Second NPN transistor; 9. PNP transistor; 10. Discharge control switch. Detailed Implementation

[0010] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0011] In the description of this utility model, it should be noted that the terms "upper," "lower," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used 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, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0012] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "provided with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; 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 be a connection within 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.

[0013] The structural features of this utility model will now be described in detail with reference to the accompanying drawings.

[0014] See Figure 3 A fast discharge circuit for a modular power supply includes a modular power supply 1, an output capacitor 2 connected in parallel to the negative and positive output terminals of the modular power supply 1, and a first circuit, a second circuit and a third circuit connected in parallel to the output capacitor 2.

[0015] The first circuit has a first resistor 4 and a second resistor 5 connected in series. The second circuit has a third resistor 6 and a first NPN transistor 7 connected in series. The base of the first NPN transistor 7 is connected to the first circuit. The base of the first NPN transistor 7 is connected between the first resistor 4 and the second resistor 5. The collector of the first NPN transistor 7 is connected to the third resistor 6. The emitter of the first NPN transistor 7 is connected to the negative output terminal of the module power supply 1. The third circuit has a discharge resistor 3 and a PNP transistor 9 connected in series. A second NPN transistor 8 is connected between the PNP transistor 9 and the second circuit. The base of the second NPN transistor 8 is connected to the collector of the first NPN transistor 7. The collector of the second NPN transistor 8 is connected to the base of the PNP transistor 9. The emitter of the second NPN transistor 8 is connected to the negative output terminal of the module power supply 1. The collector of the PNP transistor 9 is connected to the discharge resistor 3. The emitter of the PNP transistor 9 is connected to the negative output terminal of the module power supply 1.

[0016] This utility model discloses a fast discharge circuit for a modular power supply, enabling the modular power supply to automatically and rapidly discharge without the need for additional control signals. Specifically, during operation, when the output is normal, the voltage obtained by the voltage divider through the first resistor 4 and the second resistor 5 is relatively high, causing the first NPN transistor 7 to conduct. The conduction of the first NPN transistor 7 pulls down the base voltage of the second NPN transistor 8, causing the second NPN transistor 8 to turn off. The turn-off of the second NPN transistor 8 causes the discharge resistor 3 to turn off and not work. When the output voltage is turned off, the output voltage decreases, the first NPN transistor 7 turns off, the second NPN transistor 8 conducts, the PNP transistor 9 conducts, and the discharge resistor 3 works, causing the output voltage to drop instantaneously, achieving rapid discharge. Thus, the entire circuit solves the problems of excessive power consumption from directly connecting the discharge resistor in parallel or the complexity of the discharge control circuit.

[0017] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fast discharge circuit for a modular power supply, comprising a modular power supply (1), wherein an output capacitor (2) is connected in parallel to the negative and positive terminals of the output of the modular power supply (1), characterized in that, The output capacitor (2) is connected in parallel with a first circuit, a second circuit, and a third circuit; The first circuit has a first resistor (4) and a second resistor (5) connected in series. The second circuit has a third resistor (6) and a first NPN transistor (7) connected in series, and the base of the first NPN transistor (7) is connected to the first circuit; The third circuit is connected in series with a discharge resistor (3) and a PNP transistor (9), and the PNP transistor (9) is connected to the second circuit with a second NPN transistor (8).

2. The fast discharge circuit for a modular power supply according to claim 1, characterized in that, The base of the first NPN transistor (7) is connected between the first resistor (4) and the second resistor (5), the collector of the first NPN transistor (7) is connected to the third resistor (6), and the emitter of the first NPN transistor (7) is connected to the negative output terminal of the module power supply (1).

3. The fast discharge circuit for a modular power supply according to claim 2, characterized in that, The base of the second NPN transistor (8) is connected to the collector of the first NPN transistor (7), the collector of the second NPN transistor (8) is connected to the base of the PNP transistor (9), and the emitter of the second NPN transistor (8) is connected to the negative output of the module power supply (1).

4. The fast discharge circuit for a modular power supply according to claim 3, characterized in that, The collector of the PNP transistor (9) is connected to the discharge resistor (3), and the emitter of the PNP transistor (9) is connected to the negative output terminal of the module power supply (1).

Images