Potential detection discharge control circuit

Abstract

The invention provides a potential detection discharge control circuit, which comprises a voltage division module, a current limiting module, a voltage proportion regulation and control module and a discharge module, and is characterized in that the voltage division module is used for carrying out voltage division processing on the voltage of a detection end and outputting an intermediate voltage signal; the current limiting module is used for controlling the current flowing through the voltage proportion adjusting module and the discharging module according to the intermediate voltage signal; the voltage proportion regulation and control module is used for outputting a discharge control signal according to the intermediate voltage signal; and the discharge module is used for forming a discharge loop according to the discharge control signal. Therefore, the output end can be flexibly controlled to discharge according to the potential change of the detection end, the discharge protection of the circuit is realized, the overall circuit structure is compact, a constant current source, an overvoltage judgment circuit and the like do not need to be configured, the circuit structure is greatly simplified, and the overall power consumption of the circuit is reduced.

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 to ensure safe operation of equipment. As the functions of electronic equipment become more complex, the requirements for voltage stability and discharge control are also increasing. Voltage detection and discharge control circuits can monitor the power supply voltage and ensure that appropriate protection measures (such as discharge) are taken when it is too low to prevent equipment damage or performance degradation.

[0003] Traditional voltage detection circuits usually use voltage comparators and operational amplifiers to compare input voltage and reference voltage. When the input voltage exceeds the reference voltage, the output Vout is high, and 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. The circuit structure of this voltage detection circuit is complex and the power consumption is high. To address this problem, other patents have integrated enhancement and depletion transistors, constant current sources, overvoltage circuits, and control circuits to reduce the overall power consumption of the circuit.

[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 will affect 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, including: a voltage division 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 used 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 switch tube and a second switch tube, wherein:

[0016] The control end of the first switch tube is connected to the control end of the second switch tube, the first end of the first switch tube is connected to the discharge output end, the first end of the second switch tube is connected to the discharge output end, the second end of the first switch tube constitutes the first output end of the current limiting module, and the second end of the second switch 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 a discharge control signal;

[0020] The first end of the third resistor is connected to the second output end of the current limiting module, and the 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 end 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 end 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 a cut-off state, and the fourth switch tube is controlled to be in a conduction 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 sets a voltage divider module, a current limiting module, a voltage ratio control module and a discharge module, wherein: the voltage divider module is used to divide the voltage at the detection end and output an intermediate voltage signal; the current limiting module 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 is used to output a discharge control signal according to the intermediate voltage signal; the discharge module is used to form a discharge loop according to the discharge control signal. Therefore, the output end can be flexibly controlled to discharge according to the potential change of the detection end, so as to realize the discharge protection of the circuit, and the overall circuit structure is compact, and there is no need to configure a constant current source, an overvoltage judgment circuit, etc., which greatly simplifies the circuit structure and reduces the overall power consumption of the circuit. 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 will briefly introduce the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings in the following descriptions are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without creative work. By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, purposes and advantages of the present invention will become more obvious:

[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 is described in detail below in conjunction with 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 of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0033] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. 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, connection can be used for fixing or for 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 operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] For example, Figure 1 The schematic diagram of the structure of the potential detection discharge control circuit provided in the embodiment of the present application is as follows: 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 adjustment 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; the discharge module 240 is used to form a discharge loop according to the discharge control signal.

[0037] Exemplary, 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 an intermediate voltage signal.

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

[0039] Exemplary, 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] Exemplary, 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: the first end of the second resistor R2 is connected to the first output end of the current limiting module 220, the 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; the first end of the third resistor R3 is connected to the second output end of the current limiting module 220, and the second end of the third resistor R3 is connected to the discharge module 240; the 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 the second end of the third switch tube MN1 is grounded.

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

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

[0044] Exemplary, 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 an on state, and the fourth switch tube MN2 is controlled to be in an off state through 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 an off state, and the fourth switch tube MN2 is controlled to be in an on state through the intermediate voltage signal Vg1, so that the discharge output terminal B is grounded through the fourth switch tube MN2 to form 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 turned off, 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] In this embodiment, a voltage dividing module, a current limiting module, a voltage ratio control module and a discharge module are provided, wherein: 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 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 is used to output a discharge control signal according to the intermediate voltage signal; and the discharge module is used to form a discharge loop according to the discharge control signal. Thus, the output end can be flexibly controlled to discharge according to the potential change at the detection end, so as to realize the discharge protection of the circuit, and the overall circuit structure is compact, and there is no need to configure a constant current source, an overvoltage judgment circuit, etc., which greatly simplifies the circuit structure and reduces the overall power consumption of the circuit.

[0048] The potential detection discharge control circuit provided in this embodiment has a simple overall circuit structure, uses a small number of device types, and is compatible with all CMOS processes. In addition, the circuit has good stability, the discharge mode and the non-discharge mode can be switched smoothly, and the current loss of the circuit in the non-discharge mode is very small. In addition, the circuit in this embodiment can also be used for any special application that requires detecting the voltage potential of the input terminal and automatically controlling the discharge of the output terminal voltage.

[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 combination 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 creative work are within the scope of protection of the present invention.

[0050] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the 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 obvious 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 these embodiments shown in this article, but will comply with the widest range 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 modifications or variations 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 division module, current limiting module, voltage ratio 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 used to control the current flowing through the voltage ratio adjustment module and the discharge module according to the intermediate voltage signal; The voltage ratio control module is used to output a discharge control signal according to the intermediate voltage signal; 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 comprises: 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 2, characterized in that: The current limiting module includes: a first switch tube and a second switch tube, wherein: The control end of the first switch tube is connected to the control end of the second switch tube, the first end of the first switch tube is connected to the discharge output end, the first end of the second switch tube is connected to the discharge output end, the second end of the first switch tube constitutes the first output end of the current limiting module, and the second end of the second switch tube constitutes the second output end of the current limiting module.

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

6. The potential detection discharge control circuit according to claim 4, characterized in that: The voltage ratio control module includes: a second resistor, a third resistor and a third switch tube, wherein: 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 a 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; 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.

7. The potential detection discharge control circuit according to claim 6, characterized in that: The third 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: 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.

9. The potential detection discharge control circuit according to claim 8, characterized in that: The fourth switch tube is an N-channel metal oxide semiconductor field effect transistor.

10. The potential detection discharge control circuit according to claim 8, 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 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 end maintains a high potential; When the potential of the detection end is lower than a preset value, the third switch tube is triggered to be in a cut-off state, and the fourth switch tube is controlled to be in a conduction state through the intermediate voltage signal, so that the discharge output end is grounded through the fourth switch tube to form a discharge loop.

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