Discharging circuit and electronic equipment

Abstract

The utility model provides a discharge circuit and an electronic device, when the electronic device is powered on, a voltage dividing loop divides the voltage of a power supply and then provides a voltage signal to a time delay circuit, so that the time delay circuit is conducted, the discharge loop is turned off, the electronic device is normally powered on and works, and when the electronic device is powered off, the time delay circuit is turned off. And when the voltage signal cannot maintain the conduction of the time delay loop, the time delay loop is switched off, and at the moment, the discharge loop is conducted, so that the power supply is quickly grounded, and the quick discharge of the circuit is completed.

Description

Technical Field

[0001] This utility model relates to the field of power electronics, and in particular to a discharge circuit and electronic device. Background Technology

[0002] In the field of power control technology for electronic devices, traditional circuit discharge schemes mainly employ a single-resistor discharge method. This approach presents a difficult-to-resolve contradiction: using a lower resistance resistor, while accelerating the discharge speed, significantly impacts the normal operation of the device, resulting in unnecessary power consumption; conversely, using a higher resistance resistor reduces the impact on normal operation but leads to an excessively slow discharge speed. Especially in practical circuits, due to the parasitic capacitance inherent in the components, voltage release is even slower, and the discharge rate further decreases as the voltage drops.

[0003] In view of the above, this application is hereby submitted. Utility Model Content

[0004] This utility model discloses a discharge circuit and electronic device, which aims to achieve rapid discharge of the circuit without affecting the normal operation of the device.

[0005] The first embodiment of this utility model provides a fast discharge circuit, including: a voltage divider circuit, a delay circuit, and a discharge circuit;

[0006] The input terminals of the voltage divider circuit, the delay circuit, and the discharge circuit are electrically connected to the output terminal of the power supply.

[0007] The output terminal of the voltage divider circuit is electrically connected to the control terminal of the delay circuit, the output terminal of the delay circuit is electrically connected to the control terminal of the discharge circuit, and the output terminal of the discharge circuit is grounded.

[0008] The voltage divider circuit can shut off the delay circuit when the power supply is disconnected, thereby turning on the discharge circuit so that the power supply is grounded by the discharge circuit.

[0009] Preferably, the voltage divider circuit includes: a first resistor and a second resistor;

[0010] The first end of the first resistor is electrically connected to the power supply, and the second end of the first resistor is grounded through the second resistor.

[0011] Preferably, the delay circuit includes: a third resistor, a first MOSFET, and a capacitor;

[0012] The power supply is electrically connected to the drain (D) terminal of the first MOSFET through the third resistor, the second end of the first resistor is electrically connected to the gate (G) terminal of the first MOSFET, the source (S) terminal of the first MOSFET is grounded, and the first capacitor is connected in parallel across the source (S) and drain (D) terminals of the first MOSFET.

[0013] Preferably, the discharge circuit includes: a fourth resistor and a second MOSFET;

[0014] The power supply is electrically connected to the drain (D) of the second MOSFET through the fourth resistor. The drain (D) of the first MOSFET is electrically connected to the gate (G) of the second MOSFET. The source (S) of the second MOSFET is grounded.

[0015] Preferably, the first MOS transistor and the second MOS transistor are N-MOS transistors.

[0016] The second embodiment of this utility model provides an electronic device, including a fast discharge circuit as described in any one of the above claims.

[0017] This utility model discloses a discharge circuit and an electronic device. When the electronic device is powered on, the voltage divider circuit divides the power supply and provides a voltage signal to the delay circuit, so that the delay circuit is turned on and the discharge circuit is turned off, and the electronic device works normally. When powered off, the voltage signal cannot maintain the conduction of the delay circuit, the delay circuit is turned off, and the discharge circuit is turned on, so that the power supply is quickly grounded, completing the rapid discharge of the circuit. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a discharge circuit provided by this utility model. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely represents selected embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0020] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0021] This utility model discloses a discharge circuit and electronic device, which aims to achieve rapid discharge of the circuit without affecting the normal operation of the device.

[0022] Please see Figure 1 The first embodiment of this utility model provides a fast discharge circuit, including: a voltage divider circuit 1, a delay circuit 2, and a discharge circuit 3;

[0023] The input terminals of the voltage divider circuit 1, the delay circuit 2, and the discharge circuit 3 are electrically connected to the output terminal of the power supply.

[0024] The output terminal of the voltage divider circuit 1 is electrically connected to the control terminal of the delay circuit 2, the output terminal of the delay circuit 2 is electrically connected to the control terminal of the discharge circuit 3, and the output terminal of the discharge circuit 3 is grounded.

[0025] The voltage divider circuit 1 can shut off the delay circuit 2 when the power supply is disconnected, thereby turning on the discharge circuit 3 so that the power supply is grounded by the discharge circuit 3.

[0026] It should be noted that in this embodiment, the control signal is maintained at an appropriate level when the power supply output voltage is high by using the voltage divider principle, thus ensuring the stable operation of the delay circuit 2. When the power supply is in normal operating condition, the output signal of the voltage divider circuit 1 can keep the delay circuit 2 in a conducting state. At this time, the energy storage unit of the delay circuit 2 is slowly charged. At the same time, the control terminal of the discharge circuit 3 is clamped to a low level due to the effect of the delay circuit 2, so that the discharge circuit 3 is in a turned-off state, thereby ensuring that the normal output of the power supply is not affected.

[0027] When the power supply is disconnected, the power supply output voltage gradually decreases, and the output signal of voltage divider circuit 1 weakens accordingly, causing the control element in delay circuit 2 to turn off. At this time, the energy storage unit in delay circuit 2 releases the stored charge, rapidly turning on the discharge circuit 3 by increasing the voltage at the control terminal. Once discharge circuit 3 is turned on, the residual voltage of the power supply is quickly introduced to ground through discharge circuit 3, thereby achieving efficient discharge to the power supply output. In particular, after the voltage drops to a certain threshold, the control element in discharge circuit 3 turns off again because the gate voltage is lower than the turn-on voltage, and the discharge process ends.

[0028] In one possible implementation of this utility model, the voltage divider circuit includes: a first resistor R1 and a second resistor R2;

[0029] The first end of the first resistor R1 is electrically connected to the power supply, and the second end of the first resistor R1 is grounded through the second resistor R2.

[0030] It should be noted that, in this embodiment, the resistance value of the first resistor R1 is preferably set to 100kΩ and the resistance value of the second resistor R2 is set to 10kΩ. This ratio enables the circuit to reliably switch the state of the delay circuit 2 under different input voltage conditions, thereby controlling the opening and closing of the discharge circuit 3.

[0031] When the power supply is in normal operating condition, the control voltage provided by the voltage divider circuit keeps the control element of delay circuit 2 on, thereby clamping discharge circuit 3 in the off state. When the power supply is disconnected, the power supply voltage begins to decrease, and the output voltage provided by the voltage divider circuit also decreases accordingly. At this time, when the voltage divider signal drops below the cutoff level of the control element of delay circuit 2, delay circuit 2 will switch states, thereby triggering discharge circuit 3 to conduct, thus realizing the rapid discharge function.

[0032] In one possible implementation of this utility model, the delay circuit 2 includes: a third resistor R3, a first MOSFET Q1, and a capacitor C1;

[0033] The power supply is electrically connected to the drain (D) of the first MOSFET Q1 through the third resistor R3. The second end of the first resistor R1 is electrically connected to the gate (G) of the first MOSFET Q1. The source (S) of the first MOSFET Q1 is grounded. The first capacitor C1 is connected in parallel across the source (S) and drain (D) of the first MOSFET Q1.

[0034] It should be noted that, in this embodiment, the capacitor C1 is preferably set to 1μF, and the resistance of the third resistor R3 is set to 10kΩ. Under normal operating conditions, the power supply provides an appropriate control level signal to the delay circuit 2 through the voltage divider circuit 1, causing the first MOSFET Q1 to be in the conducting state. At this time, a low-impedance path is formed between the drain and source terminals of the first MOSFET Q1, ensuring that the capacitor C1 can quickly discharge to the ground potential, thereby maintaining the closed state of the discharge circuit 3.

[0035] When the power is disconnected, the input voltage gradually decreases. Through the output signal of voltage divider circuit 1, the gate voltage of the first MOSFET Q1 drops below its cutoff level, causing the first MOSFET Q1 to turn off. At this time, the RC network formed by the third resistor R3 and capacitor C1 begins to work. Capacitor C1 is slowly charged through the third resistor R3, and its voltage gradually increases. The delay circuit 2 thus generates a voltage signal that varies with time. During this stage, the output voltage of the delay circuit 2 gradually increases to the threshold that can trigger the discharge circuit 3 to conduct, thereby activating the discharge circuit 3.

[0036] In one possible implementation of this utility model, the discharge circuit 3 includes: a fourth resistor R4 and a second MOS transistor Q2;

[0037] The power supply is electrically connected to the drain (D) of the second MOSFET Q2 through the fourth resistor R4. The drain (D) of the first MOSFET Q1 is electrically connected to the gate (G) of the second MOSFET Q2. The source (S) of the second MOSFET Q2 is grounded.

[0038] It should be noted that after the power is turned off, with the action of delay circuit 2, the first MOSFET Q1 gradually turns off, and its drain voltage increases. When this voltage reaches the gate-source threshold voltage of the second MOSFET Q2, the second MOSFET Q2 is triggered to conduct, thus forming a low-impedance path that allows the power supply to be quickly grounded through the fourth resistor R4 and the second MOSFET Q2. This discharge path can effectively accelerate the release of residual charge in the power supply, thereby achieving the purpose of rapid discharge.

[0039] In one possible implementation of this utility model, the first MOS transistor Q1 and the second MOS transistor Q2 are N-MOS transistors.

[0040] It should be noted that in other embodiments, the first MOS transistor Q1 and the second MOS transistor Q2 may also be P-MOS transistors, and their connection methods will change accordingly. These solutions can be selected according to the actual situation, and no specific limitation is made here, but these solutions are all within the protection scope of this utility model.

[0041] The second embodiment of this utility model provides an electronic device, including a fast discharge circuit as described in any one of the above claims.

[0042] This utility model discloses a discharge circuit and an electronic device. When the electronic device is powered on, the voltage divider circuit 1 divides the power supply and provides a voltage signal to the delay circuit, so that the delay circuit 2 is turned on, thereby turning off the discharge circuit 3, and the electronic device works normally. When powered off, the voltage signal cannot maintain the conduction of the delay circuit 2, the delay circuit 2 is turned off, and the discharge circuit 3 is turned on, so that the power supply is quickly grounded, completing the rapid discharge of the circuit.

[0043] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions that fall within the scope of this utility model's concept are protected by this utility model.

Claims

1. A fast discharge circuit, characterized in that, include: Voltage divider circuit, time delay circuit, and discharge circuit; The input terminals of the voltage divider circuit, the delay circuit, and the discharge circuit are electrically connected to the output terminal of the power supply. The output terminal of the voltage divider circuit is electrically connected to the control terminal of the delay circuit, the output terminal of the delay circuit is electrically connected to the control terminal of the discharge circuit, and the output terminal of the discharge circuit is grounded. The voltage divider circuit can shut off the delay circuit when the power supply is disconnected, thereby turning on the discharge circuit so that the power supply is grounded by the discharge circuit.

2. The fast discharge circuit according to claim 1, characterized in that, The voltage divider circuit includes: a first resistor and a second resistor; The first end of the first resistor is electrically connected to the power supply, and the second end of the first resistor is grounded through the second resistor.

3. The fast discharge circuit according to claim 2, characterized in that, The delay circuit includes: a third resistor, a first MOSFET, and a capacitor; The power supply is electrically connected to the drain (D) terminal of the first MOSFET through the third resistor, the second end of the first resistor is electrically connected to the gate (G) terminal of the first MOSFET, the source (S) terminal of the first MOSFET is grounded, and the first capacitor is connected in parallel across the source (S) and drain (D) terminals of the first MOSFET.

4. The fast discharge circuit according to claim 3, characterized in that, The discharge circuit includes: a fourth resistor and a second MOSFET; The power supply is electrically connected to the drain (D) of the second MOSFET through the fourth resistor. The drain (D) of the first MOSFET is electrically connected to the gate (G) of the second MOSFET. The source (S) of the second MOSFET is grounded.

5. A fast discharge circuit according to claim 3, characterized in that, The first MOS transistor and the second MOS transistor are N-MOS transistors.

6. An electronic device, characterized in that, Includes a fast discharge circuit as described in any one of claims 1 to 4.

Images