Residual electricity rapid discharge circuit suitable for high-voltage input

Abstract

The utility model discloses a residual electricity rapid discharge circuit suitable for high voltage input, which belongs to the technical field of power electronics and comprises a voltage stabilizing diode, a first triode and a second triode, the voltage stabilizing diode, a first resistor and a second resistor are sequentially connected in series to form a first-stage voltage division circuit, and the first-stage voltage division circuit is used for controlling the second triode. The sixth resistor, the third resistor, the fourth resistor and the fifth resistor are sequentially connected in series to form a second-stage voltage division circuit, the second-stage voltage division circuit is used for controlling the first triode, and the two ends of the first-stage voltage division circuit and the two ends of the second-stage voltage division circuit are connected between the power source positive electrode and the power source negative electrode respectively. Compared with the prior art, the residual electricity rapid discharge circuit serves as a part of a direct-current high-voltage power supply, when the input end of the direct-current power supply is powered off, the residual electricity rapid discharge circuit serves as a discharge loop to achieve input voltage discharge, the time needed by input voltage discharge can be effectively shortened, and the working reliability is improved.

Description

Technical Field

[0001] This utility model belongs to the field of power electronics technology, and in particular relates to a residual current fast discharge circuit suitable for high voltage input. Background Technology

[0002] Existing input voltage bleed methods utilize the input terminal line impedance as a bleed circuit. When the input voltage is disconnected, the large-capacity filter capacitor at the input terminal causes the input voltage to drop slowly, requiring a long time to completely bleed to zero. Repeated power-on within a short period poses a risk of operational instability. Replacing existing foreign technologies with only basic components and effectively reducing the input voltage bleed time has become a key technical challenge in this field. Utility Model Content

[0003] To address the aforementioned technical problems, this utility model provides a residual current rapid discharge circuit suitable for high-voltage input, specifically solving the above problems through the following technical means:

[0004] A high-voltage input residual current rapid discharge circuit is characterized by comprising a Zener diode, a first transistor, a second transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor, wherein: the Zener diode, the first resistor, and the second resistor are connected in series to form a first-stage voltage divider circuit, with both ends of the first-stage voltage divider circuit connected between the positive and negative terminals of the power supply; the sixth resistor, the third resistor, the fourth resistor, and the fifth resistor are connected in series to form a second-stage voltage divider circuit, with both ends of the second-stage voltage divider circuit connected between the positive and negative terminals of the power supply; the base of the second transistor is connected to the line between the first and second resistors, the collector of the second transistor is connected to the line between the third and fourth resistors, and the emitter of the second transistor is connected to the negative terminal of the power supply; the base of the first transistor is connected to the line between the fourth and fifth resistors, the collector of the first transistor is connected to the line between the sixth and third resistors, and the emitter of the first transistor is connected to the negative terminal of the power supply.

[0005] Preferably, the cathode of the Zener diode is connected to the positive terminal of the power supply, and the anode of the Zener diode is connected to the negative terminal of the power supply in sequence through a first resistor and a second resistor.

[0006] Preferably, the Zener diode is a 36V to 48V Zener diode.

[0007] Preferably, the sixth resistor is a resistor with a strength of 2K to 2.5K ohms.

[0008] The residual current rapid discharge circuit of this utility model, suitable for high voltage input, has the following beneficial effects:

[0009] This residual current rapid discharge circuit, as part of a DC high-voltage power supply, discharges the input voltage by using its own input line impedance as a discharge circuit when the DC power input is de-energized. This effectively reduces the time required for input voltage discharge and improves operational reliability. Furthermore, this circuit uses only basic components and does not rely on existing foreign technologies. Its peripheral components can be flexibly configured to achieve rapid discharge of different DC input voltages, enhancing the product's practicality. Attached Figure Description

[0010] To more clearly illustrate the technical solution of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the overall circuit of this utility model. Detailed Implementation

[0012] In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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, and therefore should not be construed as a limitation of this utility model. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0013] The present invention will now be described in detail with reference to the accompanying drawings.

[0014] like Figure 1As shown, this high-voltage input residual current fast discharge circuit includes a Zener diode VD1, a first transistor VT1, a second transistor VT2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. In the figure, the Zener diode VD1, the first resistor R1, and the second resistor R2 are connected in series to form a first-stage voltage divider circuit. The two ends of the first-stage voltage divider circuit are connected between the positive terminal VIN+ and the negative terminal VIN- of the power supply, respectively. The first-stage voltage divider circuit is used to control the conduction and cutoff of the second transistor VT2. The sixth resistor R6, the third resistor R3, the fourth resistor R4, and the fifth resistor R5 are connected in series to form a second-stage voltage divider circuit. The two ends of the transistor are connected between the positive terminal VIN+ and the negative terminal VIN- of the power supply, respectively. The two-stage voltage divider circuit is used to control the conduction of the first transistor VT1. The base of the second transistor VT2 is connected to the line between the first resistor R1 and the second resistor R2. The collector of the second transistor VT2 is connected to the line between the third resistor R3 and the fourth resistor R4. The emitter of the second transistor VT2 is connected to the negative terminal VIN- of the power supply. The base of the first transistor VT1 is connected to the line between the fourth resistor R4 and the fifth resistor R5. The collector of the first transistor VT1 is connected to the line between the sixth resistor R6 and the third resistor R3. The emitter of the first transistor VT1 is connected to the negative terminal VIN- of the power supply.

[0015] Specifically, the cathode of the Zener diode VD1 is connected to the positive terminal VIN+ of the power supply, and the anode of the Zener diode VD1 is connected to the negative terminal VIN- of the power supply through the first resistor R1 and the second resistor R2. The Zener diode VD1 has a voltage range of 36–48V, and the sixth resistor R6 has a voltage range of 2K–2.5K ohms.

[0016] The specific working principle is as follows:

[0017] When the input is powered on normally, the Zener diode VD1 is broken down, and the voltage obtained by R2 is used to turn on VT2. After VT2 is turned on, VT1 is turned off, and the current of VIN+ flows to VIN- through R6.

[0018] When the input power is lost, the input voltage will rapidly drop to its undervoltage point through the power supply's own power consumption. At this point, the voltage at the undervoltage point cannot break down VD1, and VT2 will turn off. Simultaneously, R5 will turn on VT1 through voltage division, and the current from VIN+ will flow directly to VIN- through R6, achieving rapid discharge. By properly setting the parameters of VD1 and R6, it is ensured that the input voltage completes rapid discharge in a short time.

[0019] This circuit is composed of basic components, is flexible in implementation, and is suitable for various DC high voltage input circuits.

[0020] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A residual current rapid discharge circuit suitable for high-voltage input, characterized in that, This includes a Zener diode (VD1), a first transistor (VT1), a second transistor (VT2), a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), and a sixth resistor (R6), wherein: The Zener diode (VD1), the first resistor (R1), and the second resistor (R2) are connected in series to form a first-stage voltage divider circuit. The two ends of the first-stage voltage divider circuit are connected between the positive terminal (VIN+) and the negative terminal (VIN-) of the power supply, respectively. The sixth resistor (R6), the third resistor (R3), the fourth resistor (R4), and the fifth resistor (R5) are connected in series to form a two-stage voltage divider circuit. The two ends of the two-stage voltage divider circuit are connected between the positive terminal (VIN+) and the negative terminal (VIN-) of the power supply, respectively. The base of the second transistor (VT2) is connected in the line between the first resistor (R1) and the second resistor (R2), the collector of the second transistor (VT2) is connected in the line between the third resistor (R3) and the fourth resistor (R4), and the emitter of the second transistor (VT2) is connected to the negative terminal of the power supply (VIN-). The base of the first transistor (VT1) is connected to the line between the fourth resistor (R4) and the fifth resistor (R5), the collector of the first transistor (VT1) is connected to the line between the sixth resistor (R6) and the third resistor (R3), and the emitter of the first transistor (VT1) is connected to the negative terminal of the power supply (VIN-).

2. The residual current rapid discharge circuit suitable for high-voltage input according to claim 1, characterized in that, The cathode of the Zener diode (VD1) is connected to the positive terminal of the power supply (VIN+), and the anode of the Zener diode (VD1) is connected to the negative terminal of the power supply (VIN-) through the first resistor (R1) and the second resistor (R2) in sequence.

3. The residual current rapid discharge circuit suitable for high-voltage input according to claim 1, characterized in that, The Zener diode (VD1) is a Zener diode with a voltage of 36V to 48V.

4. The residual current rapid discharge circuit suitable for high-voltage input according to claim 1, characterized in that, The sixth resistor (R6) is a resistor with a strength of 2K to 2.5K ohms.

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