Control circuit for voltage detection and voltage detection circuit

Abstract

The invention provides a control circuit for voltage detection and a voltage detection circuit, relates to the technical field of voltage detection, and can detect the voltage of a power supply by accessing a control signal to a first conduction unit when the power supply is in a normal working state, and can detect the voltage of the power supply when the power supply is in a closed or dormant state. And the input of the control signal to the first conduction unit is stopped, so that the detection of the power supply voltage is stopped, the continuous detection of the power supply voltage is not needed, and the energy consumption of the power supply is reduced. According to the control circuit for voltage detection, the control end of a first conduction unit is used for receiving a control signal and conducting under the condition that the control signal is received, the input end of a first voltage division circuit is used for receiving a to-be-detected voltage, and the input end of a second conduction unit is used for receiving the to-be-detected voltage and conducting under the condition that the control signal is received. The first voltage division circuit controls the conduction of the second conduction unit, and the second conduction unit is conducted under the condition that the voltage output by the second output end is smaller than the to-be-measured voltage received by the input end of the second conduction unit.

Description

Technical Field

[0001] The present application relates to the technical field of voltage detection, and in particular to a control circuit for voltage detection and a voltage detection circuit. Background Art

[0002] In the existing power supply voltage detection technology, the output signal and the voltage signal in the battery are usually divided and amplified to detect the low-voltage power supply signal and to detect whether the performance of the power supply is in a normal state.

[0003] However, in the existing power supply voltage detection technology, continuous detection of the voltage signal requires the power supply voltage detection circuit to work continuously. The continuous operation of the detection circuit will cause waste of electric energy and loss of the battery. Summary of the invention

[0004] Based on this, it is necessary to provide a control circuit for voltage detection and a voltage detection circuit to address the above technical issues.

[0005] In a first aspect, the present application provides a control circuit for voltage detection, comprising:

[0006] A first conducting unit, wherein a control end of the first conducting unit is used to receive a control signal and conduct when the control signal is received;

[0007] A first voltage-dividing circuit, wherein an input end of the first voltage-dividing circuit is used to receive a voltage to be measured, the first voltage-dividing circuit comprises a first output end and a second output end, and the first output end of the first voltage-dividing circuit is electrically connected to an input end of the first conduction unit;

[0008] A second conduction unit, the input end of the second conduction unit is used to receive the voltage to be measured, the second output end of the first voltage divider circuit is electrically connected to the control end of the second conduction unit to control the conduction of the second conduction unit, wherein the second conduction unit is turned on when the voltage output by the second output end is less than the voltage to be measured received by the input end of the second conduction unit.

[0009] In one embodiment, the first voltage divider circuit includes a first resistor and a second resistor connected in series, wherein the first end of the first resistor is used to receive the voltage to be measured, the second end of the first resistor is electrically connected to the first end of the second resistor, and the second end of the first resistor is electrically connected to the control end of the second conduction unit, and the second end of the second resistor is electrically connected to the input end of the first conduction unit.

[0010] In one embodiment, the control circuit for voltage detection further includes:

[0011] The first filtering circuit includes a third resistor and a first capacitor, wherein the first end of the third resistor is connected between the first resistor and the second resistor, the second end of the first filtering resistor is electrically connected to the control end of the second conduction unit, the first end of the first capacitor is used to receive the voltage to be measured, and the second end of the first capacitor is connected between the third resistor and the second conduction unit.

[0012] In one embodiment, the control circuit for voltage detection further includes:

[0013] The second filtering circuit includes a second voltage divider circuit and a second capacitor, the second voltage divider circuit and the second capacitor are connected in parallel, a first end of the second filtering circuit is electrically connected to an output end of the second conduction unit, and a second end of the second filtering circuit is used for grounding.

[0014] In one embodiment, the second voltage divider circuit includes a fourth resistor and a fifth resistor, the first end of the fourth resistor is connected between the output end of the second conduction unit and the second capacitor, the first end of the fifth resistor is electrically connected to the second end of the fourth resistor, and the second end of the fifth resistor is grounded.

[0015] In one embodiment, the control circuit for voltage detection further includes:

[0016] A third filtering circuit, wherein a first end of the third filtering circuit is connected between the fourth resistor and the fifth resistor, and a second end of the third filtering circuit is used for grounding.

[0017] In one embodiment, the third filtering circuit includes a sixth resistor and a third capacitor, the first end of the sixth resistor is electrically connected to the output end of the second voltage divider circuit, the second end of the sixth resistor is electrically connected to the first end of the third capacitor, and the second end of the third capacitor is grounded.

[0018] In one embodiment, the control circuit for voltage detection further includes:

[0019] A unidirectional conducting unit, wherein the input end of the unidirectional conducting unit is used to be electrically connected to the control end of the second conducting unit, and the output end of the unidirectional conducting unit is used to access the voltage to be measured.

[0020] In one embodiment, the control circuit for voltage detection further includes:

[0021] A control unit, wherein an output end of the control unit is electrically connected to a control end of the first conducting unit, and the control unit is used to send the control signal to the first conducting unit according to a preset interval duration.

[0022] In a second aspect, an embodiment of the present application further provides a voltage detection circuit, including:

[0023] A control circuit for voltage detection as described in any one of the first aspects;

[0024] A detection unit, wherein the input end of the detection unit is used to be electrically connected to the output end of the second conduction unit in the control circuit for voltage detection.

[0025] The control circuit for voltage detection and the control circuit for voltage detection provided in the embodiment of the present application receive a control signal through the control end of the first conduction unit, and conduct when receiving the control signal. When the first conduction unit is conducted, the first voltage divider circuit can be used for voltage division, so that the voltage output by the first output end and the second output end of the first voltage divider circuit can be less than the voltage to be measured, and further the control end of the second conduction unit and the input end can be conducted with a negative voltage, so that the voltage to be measured can be output through the second conduction unit. Therefore, the output end of the second conduction unit can output the voltage to be measured for voltage detection. When the power supply is working normally, the conduction state of the first conduction unit is controlled by the control signal, and the conduction state of the second conduction unit is further controlled, so that the detection state of the power supply voltage can be controlled. When the power supply is in the off or dormant state, the control signal is stopped from being input to the first conduction unit, so as to stop detecting the power supply voltage. It is not necessary to continuously detect the power supply voltage, and it is not necessary for the power supply voltage detection circuit to continuously work, thereby reducing the energy consumption of the power supply, increasing the service life of the power supply, and improving the reliability and stability of the power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the conventional technology, the drawings required for use in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] FIG1 is a schematic structural diagram of a control circuit for voltage detection provided in an embodiment of the present application;

[0028] FIG2 is a schematic circuit diagram of a control circuit for voltage detection provided in an embodiment of the present application;

[0029] FIG3 is a schematic structural diagram of another control circuit for voltage detection provided in an embodiment of the present application;

[0030] FIG4 is a schematic structural diagram of another control circuit for voltage detection provided in an embodiment of the present application;

[0031] FIG5 is a schematic structural diagram of another control circuit for voltage detection provided in an embodiment of the present application;

[0032] FIG6 is a schematic structural diagram of another control circuit for voltage detection provided in an embodiment of the present application;

[0033] FIG7 is a schematic structural diagram of another control circuit for voltage detection provided in an embodiment of the present application;

[0034] FIG8 is a schematic structural diagram of another control circuit for voltage detection provided in an embodiment of the present application;

[0035] FIG9 is a schematic structural diagram of another control circuit for voltage detection provided in an embodiment of the present application;

[0036] FIG10 is a schematic structural diagram of another control circuit for voltage detection provided in an embodiment of the present application;

[0037] FIG. 11 is a schematic structural diagram of another control circuit for voltage detection provided in an embodiment of the present application.

[0038] Description of reference numerals:

[0039] 00, detection unit; 100, first conduction unit; 200, first voltage divider circuit; 2001, first resistor; 2002, second resistor; 300, second conduction unit; 400, first filter circuit; 500, second filter circuit; 5001, second voltage divider circuit; 5011, fourth resistor; 5012, fifth resistor; 5002, second capacitor; 600, third filter circuit; 6001, sixth resistor; 6002, third capacitor; 700, unidirectional conduction unit; 800, control unit. DETAILED DESCRIPTION

[0040] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0042] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that when the terms "consisting of" and / or "comprising" are used in this specification, the presence of the features, integers, elements and / or components may be determined, but the presence or addition of one or more other features, integers, elements, components and / or groups is not excluded. At the same time, when used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0043] In the existing power supply voltage detection technology, the output signal and the voltage signal in the battery are usually divided and amplified to detect the low-voltage power supply signal and to detect whether the performance of the power supply is in a normal state.

[0044] However, in the existing power supply voltage detection technology, continuous detection of the voltage signal requires the power supply voltage detection circuit to work continuously. The continuous operation of the detection circuit will cause waste of electric energy and loss of the battery.

[0045] Please refer to Figure 1. An embodiment of the present application provides a control circuit for voltage detection, which includes: a first conduction unit 100, a first voltage divider circuit 200 and a second conduction unit 300, wherein the control end of the first conduction unit 100 is used to receive a control signal and is turned on when the control signal is received; the input end of the first voltage divider circuit 200 is used to receive a voltage to be measured, the first voltage divider circuit 200 includes a first output end and a second output end, the first output end of the first voltage divider circuit 200 is electrically connected to the input end of the first conduction unit 100; the input end of the second conduction unit 300 is used to receive the voltage to be measured, the second output end of the first voltage divider circuit 200 is electrically connected to the control end of the second conduction unit 300 to control the conduction of the second conduction unit 300, wherein the second conduction unit 300 is turned on when the voltage output by the second output end is less than the voltage to be measured received by the input end of the second conduction unit 300.

[0046] Exemplarily, please refer to Figure 2, which is a schematic circuit diagram of a control circuit for voltage detection provided in an embodiment of the present application. The control end of the first conduction unit T1 is used to receive a control signal and is turned on when the control signal is received. More specifically, the control signal is a high-level signal, and the first conduction unit T1 is turned on when the high-level signal is received. It should be noted that the control circuit for voltage detection provided in the embodiment of the present application may also include a resistor R4 and a resistor R5, the first end of the resistor R4 is used to receive the control signal, the second end of the resistor R4 is electrically connected to the control end of the first conduction unit T1, the first end of the resistor R5 is connected between the resistor R4 and the control end of the first conduction unit T1, and the second end of the resistor R5 is grounded.

[0047] Exemplarily, please continue to refer to Figure 2. The first voltage-dividing circuit 200 can be connected to the control end of the second conduction unit T2. When the first conduction unit T1 is turned on, it can ensure that the voltage value of the power supply voltage input to the second conduction unit T2 through the first voltage-dividing circuit 200 is less than the voltage value input to the receiving end of the second conduction unit T2. When the level signal of the control end of the second conduction unit T2 is lower than the level signal of the input end of the second conduction unit T2, the second conduction unit T2 is turned on and then outputs the power supply voltage. The output power supply voltage can be used for subsequent voltage detection. Therefore, the conduction or shutdown of the second conduction unit T2 can be achieved by controlling the conduction of the first conduction unit T1, thereby achieving voltage detection.

[0048] The control circuit for voltage detection provided in the embodiment of the present application receives a control signal through the control end of the first conduction unit 100 and is turned on when the control signal is received. When the first conduction unit 100 is turned on, the first voltage divider circuit 200 can be used for voltage division, so that the voltages output by the first output end and the second output end of the first voltage divider circuit 200 are both smaller than the voltage to be measured, and further, the control end of the second conduction unit 300 can be turned on with a negative voltage with the input end, so that the voltage to be measured can be output through the second conduction unit 300. Therefore, the output end of the second conduction unit 300 can output the voltage to be tested for voltage detection. When the power supply is working normally, the conduction state of the first conduction unit 100 is controlled by a control signal, and the conduction state of the second conduction unit 300 is further controlled, so that the detection state of the power supply voltage can be controlled. When the power supply is in the off or dormant state, the control signal is stopped from being input to the first conduction unit 100, so as to stop detecting the power supply voltage. There is no need to continuously detect the power supply voltage, and there is no need for the power supply voltage detection circuit to continue to work, thereby reducing the energy consumption of the power supply, increasing the service life of the power supply, and improving the reliability and stability of the power supply.

[0049] Please refer to Figures 2 and 3. In some embodiments, the first voltage divider circuit 200 includes a first resistor 2001 and a second resistor 2002 connected in series, wherein the first end of the first resistor 2001 is used to receive the voltage to be measured, the second end of the first resistor 2001 is electrically connected to the first end of the second resistor 2002, and the second end of the first resistor 2001 is electrically connected to the control end of the second conductive unit 300, and the second end of the second resistor 2002 is electrically connected to the input end of the first conductive unit 100.

[0050] Exemplarily, the first voltage divider circuit 200 includes a first resistor R1 and a second resistor R2 connected in series, the first end of the first resistor R1 receives the voltage to be measured, and the second end of the first resistor R1 is electrically connected to the first end of the second resistor R2, thereby forming a continuous current path, so that the voltage is proportionally distributed between the two resistors, thereby realizing the voltage division function, and then making the voltage value input to the first voltage divider circuit 200 less than the voltage value output by the first voltage divider circuit 200. Further, the second end of the first resistor R1 is electrically connected to the control end of the second conduction unit T2, and the conduction or shutoff of the second conduction unit T2 can be realized by controlling the conduction of the first voltage divider circuit 200, thereby realizing the control of the circuit. When it is necessary to adjust the working state of the circuit, the circuit can be adjusted by simply changing the control signal of the control end of the first conduction unit T1, thereby improving the flexibility and stability of the circuit.

[0051] The control circuit for voltage detection provided in the embodiment of the present application, when the first unit is turned on, by setting the first voltage divider circuit 200, realizes that the voltage input to the control end of the second conduction unit 300 is lower than the voltage at the input end of the second conduction unit 300, so as to realize the use of the first conduction unit 100 to control the conduction or shutoff of the second conduction unit 300. When it is necessary to detect the voltage, the first conduction unit 100 is controlled to be turned on, and then the second conduction unit 300 is controlled to be turned on, so that the control circuit for voltage detection outputs the voltage to be measured. When it is not necessary to detect the voltage, the first conduction unit 100 is controlled to be turned off, and then the second conduction unit 300 is controlled to be turned off, and the control circuit for voltage detection stops outputting the voltage to be measured, thereby realizing the control of voltage detection.

[0052] Please refer to Figure 4. In some embodiments, the control circuit for voltage detection also includes: a first filtering circuit 400, including a third resistor R3 and a first capacitor C1, the first end of the third resistor R3 is connected between the first resistor 2001 and the second resistor 2002, the second end of the first filtering resistor is electrically connected to the control end of the second conduction unit 300, the first end of the first capacitor C1 is used to receive the voltage to be measured, and the second end of the first capacitor C1 is connected between the third resistor R3 and the second conduction unit 300.

[0053] Exemplarily, the first filtering circuit 400 can filter the received voltage signal to eliminate noise in the voltage signal to facilitate subsequent signal processing and analysis, thereby achieving high-precision detection of the voltage to be measured.

[0054] The control circuit for voltage detection provided in the embodiment of the present application realizes filtering of the voltage to be measured at the input end of the second conduction unit 300 by setting the first filter circuit 400, thereby eliminating noise interference of the voltage to be measured. In this way, the second conduction unit 300 can output a low-noise voltage, thereby realizing more accurate detection of the voltage to be measured and improving the accuracy and objectivity of voltage detection.

[0055] Please refer to Figures 2, 5 and 6. In some embodiments, the control circuit for voltage detection also includes: a second filtering circuit 500, including a second voltage divider circuit 5001 and a second capacitor 5002, the second voltage divider circuit 5001 and the second capacitor 5002 are connected in parallel, the first end of the second filtering circuit 500 is electrically connected to the output end of the second conduction unit 300, and the second end of the second filtering circuit 500 is used for grounding.

[0056] Exemplarily, when the second capacitor C2 receives the voltage to be measured output by the second conduction unit T2, the second capacitor C2 can output the direct current in the voltage to be measured, and output the direct current to the second voltage divider circuit 5001, and ground the alternating current, so that the second filter circuit 500 can filter the voltage signal output by the second conduction unit T2 to eliminate the noise in the voltage signal. More specifically, the larger the capacity of the second capacitor C2, the smaller the capacitive reactance to the alternating current, and the better the filtering effect, therefore, the capacity of the second capacitor C2 can be set according to the actual situation to meet the filtering requirements.

[0057] The control circuit for voltage detection provided in the embodiment of the present application realizes filtering of the voltage to be measured outputted from the output end of the second conduction unit 300 by setting the second filter circuit 500, eliminates noise interference of the voltage to be measured outputted from the second conduction unit 300, realizes more accurate detection of the voltage to be measured, and improves the accuracy and objectivity of voltage detection.

[0058] Please refer to Figures 2, 6 and 7. In some embodiments, the second voltage divider circuit 5001 includes a fourth resistor 5011 and a fifth resistor 5012. The first end of the fourth resistor 5011 is connected between the output end of the second conduction unit 300 and the second capacitor 5002. The first end of the fifth resistor 5012 is electrically connected to the second end of the fourth resistor 5011. The second end of the fifth resistor 5012 is grounded.

[0059] Exemplarily, the second voltage divider circuit 5001 includes a fourth resistor R6 and a fifth resistor R8, the first end of the fourth resistor R6 receives the voltage to be measured output by the second conduction unit T2, and the first end of the fifth resistor R8 is electrically connected to the second end of the fourth resistor R6, thereby forming a continuous current path, so that the voltage to be measured is proportionally distributed between the two resistors, thereby realizing the voltage division function, and further reducing the voltage value output by the second voltage divider circuit 5001 to match the subsequent voltage detection.

[0060] The control circuit for voltage detection provided in the embodiment of the present application reduces the voltage value to be measured output by the second conduction unit 300 by setting a second voltage divider circuit 5001, so as to output a voltage to be measured with a low voltage value through the control circuit for voltage detection, thereby providing a more matched voltage value to be measured for subsequent voltage detection, and improving the objectivity and reliability of voltage detection.

[0061] Please refer to Figures 2 and 8. In some embodiments, the control circuit for voltage detection also includes: a third filter circuit 600, a first end of the third filter circuit 600 is connected between the fourth resistor 5011 and the fifth resistor 5012, and a second end of the third filter circuit 600 is used for grounding.

[0062] As an example, the first end of the third filter circuit 600 is connected between the fourth resistor R6 and the fifth resistor R8 to further filter the voltage to be measured output by the second voltage divider circuit 5001, eliminate noise in the voltage signal, thereby improving the reliability and objectivity of the voltage detection result and obtaining a more accurate voltage value.

[0063] The control circuit for voltage detection provided in the embodiment of the present application realizes filtering of the voltage to be measured outputted from the output end of the second voltage divider circuit 5001 by setting the third filtering circuit 600, thereby eliminating noise interference of the voltage to be measured outputted from the second voltage divider circuit 5001, achieving more accurate detection of the voltage to be measured, and improving the accuracy and objectivity of voltage detection.

[0064] Please continue to refer to Figures 2 and 8. In some embodiments, the third filtering circuit 600 includes a sixth resistor 6001 and a third capacitor 6002. The first end of the sixth resistor 6001 is electrically connected to the output end of the second voltage divider circuit 5001, the second end of the sixth resistor 6001 is electrically connected to the first end of the third capacitor 6002, and the second end of the third capacitor 6002 is grounded.

[0065] Exemplarily, when the third capacitor C3 receives the voltage to be measured output by the sixth resistor R7, the third capacitor C3 can output the direct current in the voltage to be measured and ground the alternating current, so that the third filter circuit 600 can filter the voltage signal output by the second conduction unit T2 to eliminate the noise in the voltage signal. More specifically, the larger the capacity of the third capacitor C3, the smaller the capacitive reactance to the alternating current, and the better the filtering effect. Therefore, the capacity of the third capacitor C3 can be set according to actual conditions to meet the filtering requirements.

[0066] The control circuit for voltage detection provided in the embodiment of the present application realizes the filtering function of the third filtering circuit 600 by setting the sixth resistor 6001 and the third capacitor 6002, thereby filtering the voltage signal output by the second conduction unit 300, eliminating noise interference in the voltage signal, and improving the objectivity and reliability of the voltage detection to be measured.

[0067] Please refer to Figures 2 and 9. In some embodiments, the control circuit for voltage detection also includes: a unidirectional conduction unit 700, the input end of the unidirectional conduction unit 700 is used to be electrically connected to the control end of the second conduction unit 300, and the output end of the unidirectional conduction unit 700 is used to access the voltage to be measured.

[0068] Exemplarily, the unidirectional conduction unit D1 may include but is not limited to a diode. The input end of the unidirectional conduction unit D1 is electrically connected to the control end of the second conduction unit T2, which can prevent the voltage to be measured from being directly input to the control end of the second conduction unit T2 without passing through the first voltage divider circuit 200, causing damage to the second conduction unit T2, thereby protecting the normal operation of the second conduction unit T2 and improving the reliability of the circuit.

[0069] The control circuit for circuit detection provided in the embodiment of the present application can prevent the voltage to be measured from being directly input into the control end of the second conduction unit 300 without passing through the first voltage divider circuit 200, thereby protecting the normal operation of the second conduction unit 300 and improving the reliability of the circuit.

[0070] Please refer to Figure 10. In some embodiments, the control circuit for voltage detection also includes: a control unit 800, the output end of the control unit 800 is electrically connected to the control end of the first conduction unit 100, and the control unit 800 is used to send a control signal to the first conduction unit 100 according to a preset interval duration.

[0071] Exemplarily, the control unit 800 sends a control signal to the first conduction unit 100 according to the preset interval duration to detect the voltage to be measured at the preset time interval, and monitors the change of the voltage to be measured in real time. More specifically, the preset time interval can be set according to actual conditions to meet the needs of different application scenarios. The control unit 800 sends a control signal to the first conduction unit 100 according to the preset interval duration, so that it is periodically turned on and off, thereby realizing real-time monitoring of the voltage. Improve the accuracy and stability of voltage detection.

[0072] The control circuit for voltage detection provided in the embodiment of the present application can detect the voltage to be measured at preset time intervals by setting a control unit 800, without the need to continuously detect the voltage to be measured, thereby reducing the energy consumption of detecting the voltage to be measured.

[0073] An embodiment of the present application provides a voltage detection circuit, please refer to Figure 11, including: a control circuit for voltage detection of any one of the above embodiments; a detection unit 00, the input end of the detection unit 00 is used to be electrically connected to the output end of the second conduction unit 300 in the control circuit for voltage detection.

[0074] Exemplarily, the input end of the detection unit 00 is electrically connected to the output end of the second conduction unit 300 in the control circuit, and the voltage to be measured can be detected when the second conduction unit 300 is turned on.

[0075] It should be noted that a power supply unit may also be included, the output end of the power supply unit is electrically connected to the input end of the voltage detection circuit, and the power supply unit provides a stable power supply for the voltage detection circuit. The voltage detection circuit provided in the embodiment of the present application may also include a sampling unit and a protection unit. The sampling unit is connected to the voltage source to be detected, and is used to collect voltage values ​​in real time. The output end of the sampling unit is electrically connected to the input end of the detection unit 00, and is used to detect the collected voltage value and monitor the voltage change in real time. The input end of the protection unit is electrically connected to the output end of the detection unit 00, and the output end of the protection unit is electrically connected to the input end of the control unit 800. When the detection result output by the detection unit 00 is abnormal voltage, the protection unit sends a circuit protection signal to the control end according to the detection signal output by the detection unit 00 to send an alarm signal, thereby improving the reliability and safety of the voltage detection circuit.

[0076] The voltage detection circuit provided in the embodiment of the present application receives a control signal through the control end of the first conduction unit 100, and is turned on when the control signal is received. When the first conduction unit 100 is turned on, the input end of the first voltage divider circuit 200 receives the voltage to be measured, and outputs the divided electrical signal to the control end of the second conduction unit 300 through the second output end. The input end of the second conduction unit 300 is used to receive the voltage to be measured. Since the voltage value of the electrical signal output by the first voltage divider circuit 200 is less than the voltage value of the voltage to be measured received by the input end of the second conduction unit 300, the second conduction unit 300 is turned on, so that the second The output end of the conduction unit 300 can output the voltage to be tested. The detection unit 00 is electrically connected to the output end of the second conduction unit 300 for voltage detection. When the power supply is working normally, the power supply voltage can be detected by connecting the control signal to the first conduction unit 100. When the power supply is in the off or dormant state, the control signal is stopped from being input to the first conduction unit 100 to stop detecting the power supply voltage. Therefore, there is no need to continuously detect the power supply voltage, and the power supply voltage detection circuit does not need to work continuously, thereby reducing the energy consumption of the power supply, increasing the service life of the power supply, and improving the reliability and stability of the power supply.

[0077] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features of the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0078] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A control circuit for voltage detection, characterized in that: include: A first conducting unit, wherein a control end of the first conducting unit is used to receive a control signal and conduct when the control signal is received; A first voltage-dividing circuit, wherein an input end of the first voltage-dividing circuit is used to receive a voltage to be measured, the first voltage-dividing circuit comprises a first output end and a second output end, and the first output end of the first voltage-dividing circuit is electrically connected to an input end of the first conduction unit; A second conduction unit, the input end of the second conduction unit is used to receive the voltage to be measured, the second output end of the first voltage divider circuit is electrically connected to the control end of the second conduction unit to control the conduction of the second conduction unit, wherein the second conduction unit is turned on when the voltage output by the second output end is less than the voltage to be measured received by the input end of the second conduction unit.

2. The control circuit for voltage detection according to claim 1, characterized in that: The first voltage divider circuit includes a first resistor and a second resistor connected in series, wherein the first end of the first resistor is used to receive the voltage to be measured, the second end of the first resistor is electrically connected to the first end of the second resistor, and the second end of the first resistor is electrically connected to the control end of the second conduction unit, and the second end of the second resistor is electrically connected to the input end of the first conduction unit.

3. The control circuit for voltage detection according to claim 2, characterized in that: Also includes: The first filtering circuit includes a third resistor and a first capacitor, wherein the first end of the third resistor is connected between the first resistor and the second resistor, the second end of the first filtering resistor is electrically connected to the control end of the second conduction unit, the first end of the first capacitor is used to receive the voltage to be measured, and the second end of the first capacitor is connected between the third resistor and the second conduction unit.

4. The control circuit for voltage detection according to claim 1, characterized in that: Also includes: The second filtering circuit includes a second voltage divider circuit and a second capacitor, the second voltage divider circuit and the second capacitor are connected in parallel, a first end of the second filtering circuit is electrically connected to an output end of the second conduction unit, and a second end of the second filtering circuit is used for grounding.

5. The control circuit for voltage detection according to claim 4, characterized in that: The second voltage divider circuit includes a fourth resistor and a fifth resistor, the first end of the fourth resistor is connected between the output end of the second conduction unit and the second capacitor, the first end of the fifth resistor is electrically connected to the second end of the fourth resistor, and the second end of the fifth resistor is grounded.

6. The control circuit for voltage detection according to claim 5, characterized in that: Also includes: A third filtering circuit, wherein a first end of the third filtering circuit is connected between the fourth resistor and the fifth resistor, and a second end of the third filtering circuit is used for grounding.

7. The control circuit for voltage detection according to claim 6, characterized in that: The third filtering circuit includes a sixth resistor and a third capacitor, the first end of the sixth resistor is electrically connected to the output end of the second voltage divider circuit, the second end of the sixth resistor is electrically connected to the first end of the third capacitor, and the second end of the third capacitor is grounded.

8. The control circuit for voltage detection according to claim 1, characterized in that: Also includes: A unidirectional conducting unit, wherein the input end of the unidirectional conducting unit is used to be electrically connected to the control end of the second conducting unit, and the output end of the unidirectional conducting unit is used to access the voltage to be measured.

9. The control circuit for voltage detection according to claim 1, characterized in that: Also includes: A control unit, wherein an output end of the control unit is electrically connected to a control end of the first conducting unit, and the control unit is used to send the control signal to the first conducting unit according to a preset interval duration.

10. A voltage detection circuit, characterized in that: include: A control circuit for voltage detection according to any one of claims 1 to 9; A detection unit, wherein the input end of the detection unit is used to be electrically connected to the output end of the second conduction unit in the control circuit for voltage detection.

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