Potential detection discharge control circuit

Abstract

The present invention provides a potential detection discharge control circuit, comprising: a voltage divider module, a current limiting module, a voltage ratio control module, and a discharge module. The voltage divider module is configured to divide the voltage at the detection end and output an intermediate voltage signal; the current limiting module is configured to control the current flowing through the voltage ratio control module and the discharge module based on the intermediate voltage signal; the voltage ratio control module is configured to output a discharge control signal based on the intermediate voltage signal; and the discharge module is configured to form a discharge loop based on the discharge control signal. This circuit can flexibly control the discharge of the output end based on changes in the potential at the detection end, thereby achieving discharge protection for the circuit. Furthermore, the overall circuit structure is compact, eliminating the need for a constant current source, overvoltage determination circuit, etc., greatly simplifying the circuit structure and reducing the overall power consumption of the circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of power electronics, and in particular to a potential detection discharge control circuit. Background Art

[0002] Voltage detection and discharge control are key technologies for ensuring safe equipment operation. As electronic devices become increasingly complex, the requirements for voltage stability and discharge control are also increasing. Voltage detection and discharge control circuits monitor the power supply voltage and ensure that appropriate protective measures (such as discharge) are taken when the voltage drops too low to prevent equipment damage or performance degradation.

[0003] Traditional voltage detection circuits typically use a voltage comparator, employing an operational amplifier to compare the input voltage with a reference voltage. When the input voltage exceeds the reference voltage, the output Vout is high; when the input voltage is less than the reference voltage, the output Vout is low. The output level Vout is then used to control the discharge circuit. This type of voltage detection circuit has a complex circuit structure and consumes high power. To address this issue, other patents have integrated enhancement-mode and depletion-mode transistors, constant current sources, overvoltage circuits, and control circuits to reduce overall circuit power consumption.

[0004] However, the structure of the above voltage detection circuit is still relatively complex, including overvoltage determination and control circuit parts, and there is a large constant DC leakage current, which affects the power consumption of the input circuit. Summary of the Invention

[0005] In view of the defects in the prior art, an object of the present invention is to provide a potential detection discharge control circuit.

[0006] In a first aspect, the present application provides a potential detection discharge control circuit, comprising: a voltage divider module, a current limiting module, a voltage ratio control module and a discharge module, wherein:

[0007] The voltage dividing module is used to divide the voltage at the detection end and output an intermediate voltage signal;

[0008] The current limiting module is used to control the current flowing through the voltage ratio adjustment module and the discharge module according to the intermediate voltage signal;

[0009] The voltage ratio control module is configured to output a discharge control signal according to the intermediate voltage signal;

[0010] The discharge module is used to form a discharge loop according to the discharge control signal.

[0011] Optionally, the voltage dividing module includes: a pseudo resistor and a first resistor;

[0012] Wherein, the first end of the pseudo resistor is connected to the detection end, the second end of the pseudo resistor is connected to the first end of the first resistor, and the second end of the first resistor is grounded;

[0013] The first end of the first resistor constitutes the output end of the voltage divider module, and is used to output an intermediate voltage signal.

[0014] Optionally, the pseudo resistor is a metal oxide semiconductor field effect transistor.

[0015] Optionally, the current limiting module includes: a first switching tube and a second switching tube, wherein:

[0016] The control end of the first switching tube is connected to the control end of the second switching tube, the first end of the first switching tube is connected to the discharge output end, the first end of the second switching tube is connected to the discharge output end, the second end of the first switching tube constitutes the first output end of the current limiting module, and the second end of the second switching tube constitutes the second output end of the current limiting module.

[0017] Optionally, the first switch tube and the second switch tube are P-channel metal oxide semiconductor field effect transistors.

[0018] Optionally, the voltage ratio control module includes: a second resistor, a third resistor and a third switch tube, wherein:

[0019] The first end of the second resistor is connected to the first output end of the current limiting module, and the second end of the second resistor is connected to the first end of the third switch tube, and constitutes the output end of the voltage ratio control module, and the output end of the voltage ratio control module is used to output the discharge control signal;

[0020] A first end of the third resistor is connected to the second output end of the current limiting module, and a second end of the third resistor is connected to the discharge module;

[0021] The control end of the third switch tube is connected to the first end of the first resistor for receiving an intermediate voltage signal, and the second end of the third switch tube is grounded.

[0022] Optionally, the third switch tube is an N-channel metal oxide semiconductor field effect transistor.

[0023] Optionally, the discharge module includes: a fourth switch tube, wherein:

[0024] The first end of the fourth switch tube is connected to the second end of the third resistor, the control end of the fourth switch tube is connected to the second end of the second resistor for receiving a discharge control signal, and the second end of the fourth switch tube is grounded.

[0025] Optionally, the fourth switch tube is an N-channel metal oxide semiconductor field effect transistor.

[0026] Optionally, when the potential of the detection terminal is higher than a preset value, the third switch tube is triggered to be in an on state, and the fourth switch tube is controlled to be in an off state through the intermediate voltage signal, so that the discharge output terminal maintains a high potential;

[0027] When the potential of the detection end is lower than a preset value, the third switch tube is triggered to be in the cut-off state, and the fourth switch tube is controlled to be in the on state through the intermediate voltage signal, so that the discharge output end is grounded through the fourth switch tube to form a discharge loop.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present invention comprises a voltage divider module, a current limiting module, a voltage ratio control module, and a discharge module. The voltage divider module divides the voltage at the detection end and outputs an intermediate voltage signal; the current limiting module controls the current flowing through the voltage ratio control module and the discharge module based on the intermediate voltage signal; the voltage ratio control module outputs a discharge control signal based on the intermediate voltage signal; and the discharge module forms a discharge loop based on the discharge control signal. This allows for flexible control of discharge at the output end based on potential changes at the detection end, achieving circuit discharge protection. Furthermore, the overall circuit structure is compact, eliminating the need for a constant current source or overvoltage determination circuit, significantly simplifying the circuit structure and reducing overall power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without inventive work. Other features, purposes and advantages of the present invention will become more apparent by reading the detailed description of the non-limiting embodiments with reference to the following drawings:

[0031] Figure 1 A schematic diagram of the structure of a potential detection discharge control circuit provided in an embodiment of the present application; DETAILED DESCRIPTION

[0032] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several variations and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, the term "connected" can be used for both fixing and circuit connection.

[0034] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0036] For example, Figure 1 This is a schematic diagram of the structure of the potential detection discharge control circuit provided in the embodiment of the present application, as shown in FIG. Figure 1 As shown, the potential detection discharge control circuit 200 in this embodiment may include: a voltage dividing module 210, a current limiting module 220, a voltage ratio control module 230 and a discharge module 240, wherein: the voltage dividing module 210 is used to divide the voltage at the detection end and output an intermediate voltage signal; the current limiting module 220 is used to control the current flowing through the voltage ratio control module and the discharge module according to the intermediate voltage signal; the voltage ratio control module 230 is used to output a discharge control signal according to the intermediate voltage signal; and the discharge module 240 is used to form a discharge loop according to the discharge control signal.

[0037] For example, combined Figure 1As shown, the voltage divider module 210 includes: a pseudo resistor MP0 and a first resistor R1; wherein, the first end of the pseudo resistor MP0 is connected to the detection end, the second end of the pseudo resistor MP0 is connected to the first end of the first resistor R1, and the second end of the first resistor R1 is grounded; the first end of the first resistor R1 constitutes the output end of the voltage divider module, which is used to output the intermediate voltage signal.

[0038] For example, combined Figure 1 As shown, the pseudo resistor MP0 adopts a metal oxide semiconductor field effect transistor.

[0039] For example, combined Figure 1 As shown, the current limiting module 220 includes: a first switch tube MP1 and a second switch tube MP2, wherein: the control end of the first switch tube MP1 is connected to the control end of the second switch tube MP2, the first end of the first switch tube MP1 is connected to the discharge output end, the first end of the second switch tube MP2 is connected to the discharge output end, the second end of the first switch tube MP1 constitutes the first output end of the current limiting module, and the second end of the second switch tube MP2 constitutes the second output end of the current limiting module.

[0040] Exemplarily, the first switch transistor MP1 and the second switch transistor MP2 are P-channel metal oxide semiconductor field effect transistors.

[0041] For example, combined Figure 1 As shown, the voltage ratio control module 230 includes: a second resistor R2, a third resistor R3 and a third switch tube MN1, wherein: a first end of the second resistor R2 is connected to the first output end of the current limiting module 220, a second end of the second resistor R2 is connected to the first end of the third switch tube MN1, and constitutes the output end of the voltage ratio control module 230, and the output end of the voltage ratio control module 230 is used to output a discharge control signal; a first end of the third resistor R3 is connected to the second output end of the current limiting module 220, and a second end of the third resistor R3 is connected to the discharge module 240; a control end of the third switch tube MN1 is connected to the first end of the first resistor R1 for receiving the intermediate voltage signal, and a second end of the third switch tube MN1 is grounded.

[0042] For example, combined Figure 1 As shown, the third switch tube MN1 is an N-channel metal oxide semiconductor field effect transistor.

[0043] For example, combined Figure 1As shown, the discharge module 240 includes: a fourth switch tube MN2, wherein: a first end of the fourth switch tube MN2 is connected to the second end of the third resistor R3, a control end of the fourth switch tube MN2 is connected to the second end of the second resistor R3, for receiving a discharge control signal, and a second end of the fourth switch tube MN2 is grounded.

[0044] For example, combined Figure 1 As shown, the fourth switch tube MN2 is an N-channel metal oxide semiconductor field effect transistor.

[0045] Exemplarily, when the potential of the detection terminal A is higher than a preset value, the third switch tube MN1 is triggered to be in the on state, and the fourth switch tube MN2 is controlled to be in the off state by the intermediate voltage signal Vg1, so that the discharge output terminal B maintains a high potential; when the potential of the detection terminal A is lower than the preset value, the third switch tube MN1 is triggered to be in the off state, and the fourth switch tube MN2 is controlled to be in the on state by the intermediate voltage signal Vg1, so that the discharge output terminal B is grounded through the fourth switch tube MN2, forming a discharge loop.

[0046] In this embodiment, A is the voltage at the input terminal (also known as the detection terminal), and B is the voltage at the output terminal (also known as the discharge terminal). In the initial state, both A and B are at high potential. In the initial state, A is at high potential, Vg1 is the voltage divided by MP0 and the resistor, and the initial signal of Vg1 is also high. MN1 is turned on, pulling the Vg2 signal low. The MN2 tube is closed, and no discharge loop is formed at the B terminal, which still maintains a high potential. When the voltage at the input terminal A begins to drop, the A voltage drops below the preset potential, the Vg1 signal drops below the threshold voltage of MN1, MN1 is turned off, and the Vg2 potential is pulled up by the MP1 tube above until Vg2 reaches above the MN2 threshold voltage. The MN2 tube is turned on, generating a constant discharge current, the B terminal is discharged, and the voltage drops until the potential is 0.

[0047] This embodiment comprises a voltage divider module, a current limiting module, a voltage ratio control module, and a discharge module. The voltage divider module divides the voltage at the detection terminal and outputs an intermediate voltage signal; the current limiting module controls the current flowing through the voltage ratio control module and the discharge module based on the intermediate voltage signal; the voltage ratio control module outputs a discharge control signal based on the intermediate voltage signal; and the discharge module forms a discharge loop based on the discharge control signal. This allows for flexible control of discharge at the output terminal based on potential changes at the detection terminal, thereby achieving circuit discharge protection. Furthermore, the overall circuit structure is compact, eliminating the need for a constant current source, overvoltage detection circuit, and the like. This significantly simplifies the circuit structure and reduces overall power consumption.

[0048] The potential detection and discharge control circuit provided in this embodiment has a simple overall circuit structure, uses a limited number of components, and is compatible with all CMOS processes. Furthermore, the circuit exhibits excellent stability, smoothly switching between discharge and non-discharge modes, and consumes minimal current in non-discharge mode. Furthermore, the circuit in this embodiment can be used in any specialized application requiring detection of the input voltage potential and automatic control of the output voltage discharge.

[0049] The above is the core idea of ​​the present invention. In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0050] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. The above description of the disclosed embodiments enables professionals and technicians in this field to implement or use the present invention. Various modifications to these embodiments will be apparent to professionals and technicians in this field, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

[0051] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various variations or modifications within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A potential detection discharge control circuit, characterized in that: include: Voltage dividing module, current limiting module, voltage proportional control module and discharge module, among which: The voltage dividing module is used to divide the voltage at the detection end and output an intermediate voltage signal; The current limiting module is configured to control the current flowing through the voltage proportional adjustment module and the discharge module according to the intermediate voltage signal. The current limiting module includes: a first switching tube and a second switching tube, wherein: a control end of the first switching tube is connected to a control end of the second switching tube, a first end of the first switching tube is connected to a discharge output end, a first end of the second switching tube is connected to the discharge output end, a second end of the first switching tube constitutes a first output end of the current limiting module, and a second end of the second switching tube constitutes a second output end of the current limiting module; The voltage ratio control module is configured to output a discharge control signal based on the intermediate voltage signal. The voltage ratio control module includes: a second resistor, a third resistor, and a third switch tube, wherein: a first end of the second resistor is connected to the first output end of the current limiting module, a second end of the second resistor is connected to the first end of the third switch tube, and constitutes the output end of the voltage ratio control module, and the output end of the voltage ratio control module is configured to output the discharge control signal; a first end of the third resistor is connected to the second output end of the current limiting module, and a second end of the third resistor is connected to the discharge module; a control end of the third switch tube is connected to the first end of the first resistor, and is configured to receive the intermediate voltage signal, and a second end of the third switch tube is grounded; The discharge module is used to form a discharge loop according to the discharge control signal.

2. The potential detection discharge control circuit according to claim 1, characterized in that: The voltage dividing module includes: a pseudo resistor and a first resistor; Wherein, the first end of the pseudo resistor is connected to the detection end, the second end of the pseudo resistor is connected to the first end of the first resistor, and the second end of the first resistor is grounded; The first end of the first resistor constitutes the output end of the voltage divider module, and is used to output an intermediate voltage signal.

3. The potential detection discharge control circuit according to claim 2, characterized in that: The pseudo resistor is a metal oxide semiconductor field effect transistor.

4. The potential detection discharge control circuit according to claim 1, wherein: The first switch tube and the second switch tube are P-channel metal oxide semiconductor field effect transistors.

5. The potential detection discharge control circuit according to claim 1, wherein: The third switch tube is an N-channel metal oxide semiconductor field effect transistor.

6. The potential detection discharge control circuit according to claim 5, characterized in that: The discharge module includes: a fourth switch tube, wherein: The first end of the fourth switch tube is connected to the second end of the third resistor, the control end of the fourth switch tube is connected to the second end of the second resistor for receiving a discharge control signal, and the second end of the fourth switch tube is grounded.

7. The potential detection discharge control circuit according to claim 6, characterized in that: The fourth switch tube is an N-channel metal oxide semiconductor field effect transistor.

8. The potential detection discharge control circuit according to claim 6, characterized in that: When the potential of the detection end is higher than a preset value, the third switch tube is triggered to be in the on state, and the fourth switch tube is controlled to be in the off state through the intermediate voltage signal, so that the discharge output end maintains a high potential; when the potential of the detection end is lower than the preset value, the third switch tube is triggered to be in the off state, and the fourth switch tube is controlled to be in the on state through the intermediate voltage signal, so that the discharge output end is grounded through the fourth switch tube, forming a discharge loop.

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