Power supply discharging circuit

Abstract

The embodiment of the utility model discloses a power supply discharge circuit, which relates to the technical field of power supply management and comprises a detection module, a signal processing module, a discharge driving module and a discharge module. The signal processing module is respectively connected with the detection module and the discharge driving module, and is grounded; the detection module is connected with a first discharge interface of the power supply; the discharge module is respectively connected with the discharge driving module and a second discharge interface of the power supply, and is grounded; and the discharge driving module is connected with the second discharge interface and is grounded. The effects of increasing the compatibility of the direct-current power supply circuit, smoothly discharging the residual charge of the power supply and further protecting the system are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of power management, in particular to a power discharge circuit. Background Art

[0002] Conventional DC power lines generally rely on the impedance and capacitance of the line itself to form an uncertain power-off effect. However, when the power supply capacitance and load impedance do not match, the power-off waveform is full of rebound and reciprocation, and the motherboard and power board of the whole system are often not designed in the same system, which makes the power board have residual charge, and the residual charge may cause the system to not completely stop running. If the power is turned on again in a short time, the system will run abnormally, and the residual charge may also cause load oscillation, causing abnormal IC data with storage. Utility Model Content

[0003] The technical problem to be solved by the embodiments of the utility model is that the residual charge of the power board causes a huge safety hazard in the system.

[0004] In order to solve the above problems, the embodiment of the utility model discloses a power supply discharge circuit, which increases the compatibility of the DC power supply line, discharges the residual charge of the power supply smoothly, and thus protects the system.

[0005] The utility model provides a power supply discharge circuit, which comprises a detection module, a signal processing module, a discharge driving module and a discharge module; the signal processing module is respectively connected to the detection module and the discharge driving module and is grounded; the detection module is connected to a first discharge interface of a power supply; the discharge module is respectively connected to the discharge driving module and a second discharge interface of the power supply and is grounded; the discharge driving module is connected to the second discharge interface and is grounded.

[0006] A further technical solution is that the signal processing module includes a voltage divider unit and a first voltage step-down unit; the voltage divider unit is respectively connected to the discharge driving module and the first voltage step-down unit and is grounded; the first voltage step-down unit is connected to the detection module.

[0007] A further technical solution is that the discharge module includes a MOS tube, the source of the MOS tube is grounded, the drain of the MOS tube is connected to the second discharge interface, and the gate of the MOS tube is respectively connected to the signal processing module and the second discharge interface.

[0008] A further technical solution is that the discharge module also includes a heat dissipation unit, which is respectively connected to the second discharge interface and the drain of the MOS tube.

[0009] Its further technical solution is that the discharge driving module includes a second step-down unit and a transistor, the second step-down unit is respectively connected to the second discharge interface, the signal processing module and the gate of the MOS tube, the transistor is respectively connected to the first step-down unit, the discharge module and the second discharge interface, and is grounded.

[0010] A further technical solution is that the detection module is a diode.

[0011] A further technical solution is that the voltage dividing unit is a resistor.

[0012] A further technical solution is that the first voltage-reducing unit is a resistor.

[0013] A further technical solution is that the second voltage-reducing unit is a resistor.

[0014] A further technical solution is that the heat dissipation unit is a resistor.

[0015] Compared with the prior art, the technical effects that can be achieved by the embodiments of the present invention include:

[0016] Increase the compatibility and stability of the power supply line, and achieve a smooth discharge effect when matching uncertain motherboards and power boards, avoiding residual electricity from adding uncertainty to the system; the detection module, signal processing module and discharge module are respectively composed of basic components such as diodes, triodes, and resistors, with a simple structure, few lines, and low cost; after meeting the preset conditions, the second discharge interface can be directly connected to the ground wire, the accelerated discharge effect is obvious, and the line is durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of a power supply discharge circuit structure provided by an embodiment of the utility model;

[0019] Figure 2 A schematic diagram of another power supply discharge circuit structure provided by an embodiment of the utility model;

[0020] Figure 3 A schematic diagram of another power supply discharge circuit structure provided in an embodiment of the utility model.

[0021] Reference numerals

[0022] The first discharge interface 11, the second discharge interface 12, the detection module 2, the signal processing module 3, the discharge driving module 4, the discharge module 5, the second buck unit 41, the transistor Q1, the heat dissipation unit 51, the MOS tube Q2, the first buck unit 32, and the voltage dividing unit 31. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments. Similar component numbers in the drawings represent similar components. Obviously, the embodiments to be described below are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0024] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0025] It should also be understood that the terms used in this utility model embodiment specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model embodiments. As used in the utility model embodiment specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0026] See also Figure 1-3 , the embodiment of the utility model provides a power supply discharge circuit. The power supply discharge circuit includes a detection module 2, a signal processing module 3, a discharge driving module 4 and a discharge module 5; the signal processing module 3 is respectively connected to the detection module 2 and the discharge driving module 4, and is grounded; the detection module 2 is connected to the first discharge interface 11 of the power supply VCC; the discharge module 5 is respectively connected to the discharge driving module 4 and the second discharge interface 12 of the power supply VCC, and is grounded; the discharge driving module 4 is connected to the second discharge interface 12, and is grounded. The specific introduction of each component is as follows:

[0027] In this embodiment, the detection module 2 includes a voltage stabilizing diode, and when the reverse voltage increases to a certain value, the reverse current suddenly increases. The signal processing module 3 is used to receive a first indication level and send a second indication level, wherein the first indication level includes any signal of a high level and a low level, and the second indication level includes any signal of a high level and a low level, and the discharge driving module 4 is used to control the discharge module 5 to disconnect / connect according to the second indication level of the signal processing module 3; for example: when the voltage of the first discharge interface 11 exceeds the voltage stabilizing value of the detection module 2, the signal processing module 3 receives a high level and sends a low level to the discharge driving module 4, and the discharge driving module 4 controls the second discharge interface 12 to be disconnected from the ground after receiving the low level. The discharge module 5 realizes the connection / blocking of the second discharge interface 12 with the ground under the control of the discharge driving module 4. When the voltage of the first discharge interface 11 does not exceed the voltage stabilizing value of the detection module 2, the signal processing module 3 receives a low level and sends a high level to the discharge driving module 4, and the discharge driving module 4 controls the discharge module 5 to operate and discharge after receiving the high level.

[0028] Through the avalanche effect of the detection module 2, when the power supply VCC releases a high voltage, the signal processing module 3 receives the high level and sends a low level to the discharge driving module 4, and the discharge driving module 4 disconnects the second discharge interface 12 from the ground line, which has no effect on the line; when the power supply VCC releases a low voltage, the signal processing module 3 receives the low level and sends a high level to the discharge driving module 4, and the discharge driving module 4 controls the operation of the discharge module 5, and the second discharge interface 12 of the power supply VCC is grounded through the discharge module 5 to achieve rapid discharge.

[0029] This circuit can prevent residual electricity from affecting the system. When there is residual charge in the power supply, it can be discharged smoothly and quickly. The circuit design is simple and the compatibility is strong.

[0030] Continue to see Figure 1-3 In this embodiment, the signal processing module 3 includes a voltage divider unit 31 and a first voltage step-down unit 32; the voltage divider unit 31 is respectively connected to the discharge driving module 4 and the first voltage step-down unit 32 and is grounded; the first voltage step-down unit 32 is connected to the detection module 2.

[0031] Specifically, the voltage divider unit 31 is connected between the first voltage reduction unit 32 and the discharge driving module 4, and is used to divide the voltage of the first discharge interface 11 entering the signal processing module 3 into different levels to meet the working requirements of the discharge driving module 4, or the voltage divider unit 31 is used to divide the current into different branches to achieve balanced distribution of the load. The first voltage reduction unit 32 is used to limit the magnitude of the current, and by selecting an appropriate resistance value, the current between the first discharge interface 11 and the signal processing module 3 is limited to prevent overload and equipment damage.

[0032] Furthermore, the discharge module 4 includes a MOS transistor Q2, a source of the MOS transistor Q2 is grounded, a drain of the MOS transistor Q2 is connected to the second discharge interface 12, and a gate of the MOS transistor Q2 is connected to the signal processing module 3 and the second discharge interface 12 respectively.

[0033] Specifically, if the gate of the MOS transistor Q2 receives a high level signal, the source of the MOS transistor Q2 is connected to the drain of the MOS transistor Q2; if the gate of the MOS transistor Q2 receives a low level signal, the source of the MOS transistor Q2 is disconnected from the drain of the MOS transistor Q2.

[0034] Furthermore, a heat dissipation unit 51 is included, which is respectively connected to the second discharge interface 12 and the drain of the MOS tube Q2.

[0035] Specifically, the heat dissipation unit 51 is used to absorb the power output from the second discharge interface 12 and convert it into heat energy for dissipation.

[0036] Further, the discharge driving module 4 includes a second step-down unit 41 and a transistor Q1, the second step-down unit 41 is respectively connected to the second discharge interface 12, the signal processing module 3 and the gate of the MOS tube Q2, the transistor Q1 is respectively connected to the first step-down unit 32, the discharge driving module 4 and the second discharge interface 12, and is grounded. The base of the transistor Q1 is connected to the detection module 2, the emitter of the transistor Q1 is grounded, and the collector of the transistor Q1 is connected to the second discharge interface 12. If the base of the transistor Q1 receives a high level, a low level signal is sent to the discharge driving module 4, and if the base of the transistor Q1 receives a low level, a high level signal is sent to the discharge driving module 4.

[0037] Specifically, the second voltage reduction unit 41 is used to limit the magnitude of the current. By selecting an appropriate resistance value, the current between the second discharge interface 12 and the signal processing module 3 is limited to prevent overload and equipment damage.

[0038] Furthermore, the detection module 2 is a diode.

[0039] In this embodiment, the detection module 2 is a diode D1. Due to the avalanche breakdown characteristic of the diode D1, when the voltage of the first discharge interface 11 exceeds a preset threshold, the reverse current of the diode D1 increases.

[0040] Furthermore, the voltage dividing unit 31 is a resistor.

[0041] In this embodiment, the voltage dividing unit 31 is a resistor R1 .

[0042] Furthermore, the first voltage reduction unit 32 is a resistor.

[0043] In this embodiment, the first voltage reducing unit 32 is a resistor R2.

[0044] Furthermore, the second voltage-reducing unit 41 is a resistor.

[0045] In this embodiment, the second voltage reducing unit 41 is a resistor R3 .

[0046] Furthermore, the heat dissipation unit 51 is a resistor.

[0047] In this embodiment, the heat dissipation unit 51 is a resistor R4.

[0048] The circuit analysis of the utility model embodiment is as follows:

[0049] When the power supply VCC is at the normal operating voltage, the diode D1 will be turned on, the current will be limited by the resistor R2, and the voltage will be divided by the resistor R1, so that the transistor Q1 is in the on state, so that the gate of the MOS tube Q2 is at a low level, the source of the MOS tube Q2 and the drain of the MOS tube Q2 are in a non-conducting state, and the resistor R4 is not connected to the power network, and has no effect on the circuit;

[0050] When the power supply VCC is powered down to the trigger voltage, the diode D1 will be cut off, and the control level of Q1 is ensured by the resistor R1, so that the transistor Q1 is in the off state, and the voltage is reduced by the resistor R3, so that the gate of the MOS tube Q2 is at a high level, the source of the MOS tube Q2 and the drain of the MOS tube Q2 are in the on state, and the resistor R4 is connected to the power network to accelerate the discharge of the line.

[0051] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0052] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be connected, detachably connected, or integrated; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification.

[0055] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include these modifications and variations.

[0056] The above is a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A power supply discharge circuit, characterized in that: include: Detection module, signal processing module, discharge driving module and discharge module; The signal processing module is respectively connected to the detection module and the discharge driving module, and is grounded; The detection module is connected to a first discharge interface of a power source; The discharge module is respectively connected to the discharge driving module and the second discharge interface of the power supply, and is grounded; The discharge driving module is connected to the second discharge interface and is grounded.

2. The power supply discharge circuit according to claim 1, characterized in that: The signal processing module includes a voltage dividing unit and a first voltage reducing unit; the voltage dividing unit is respectively connected to the discharge driving module and the first voltage reducing unit and is grounded; the first voltage reducing unit is connected to the detection module.

3. The power supply discharge circuit according to claim 2, characterized in that: The discharge module comprises a MOS tube, the source of the MOS tube is grounded, the drain of the MOS tube is connected to the second discharge interface, and the gate of the MOS tube is respectively connected to the signal processing module and the second discharge interface.

4. The power supply discharge circuit according to claim 3, characterized in that: The discharge module also includes a heat dissipation unit connected to the second discharge interface and the drain of the MOS tube respectively.

5. The power supply discharge circuit according to claim 3, characterized in that: The discharge driving module includes a second step-down unit and a transistor, the second step-down unit is respectively connected to the second discharge interface, the signal processing module and the gate of the MOS tube, the transistor is respectively connected to the first step-down unit, the discharge module and the second discharge interface, and is grounded.

6. The power supply discharge circuit according to claim 1, characterized in that: The detection module is a diode.

7. The power supply discharge circuit according to claim 2, characterized in that: The voltage dividing unit is a resistor.

8. The power supply discharge circuit according to claim 2, characterized in that: The first voltage-dropping unit is a resistor.

9. The power supply discharge circuit according to claim 5, characterized in that: The second voltage-dropping unit is a resistor.

10. The power supply discharge circuit according to claim 4, characterized in that: The heat dissipation unit is a resistor.

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