A voltage output control circuit

Abstract

The utility model discloses a voltage output control circuit. The circuit includes: voltage sampling module, voltage detection module and output control module, the input end of voltage sampling module is as the receiving end of input voltage, the output end of voltage sampling module is electrically connected with voltage detection module, voltage detection module and the control end of output control module are electrically connected, the input end of output control module is electrically connected with the input end of voltage sampling module, the output end of output control module is as the output end of input voltage, voltage detection module is used for according to the size output control signal of input voltage to output control module to make output control module according to control signal control whether the input voltage is output. The scheme realizes the output of control output voltage, thereby satisfies the power supply stability of power supply equipment.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology; in particular, it relates to a voltage output control circuit. Background Technology

[0002] Power technology is an extremely broad and crucial fundamental technology field, encompassing the generation, storage, conversion, distribution, and management of electrical energy. It can be said that any device that requires electricity cannot function without power technology.

[0003] In the field of power supply technology, the power modules inside electrical equipment have a defined tolerance range for input voltage fluctuations. Instability in the power supply system, causing the voltage to deviate from this range, will lead to abnormal power supply operation or performance degradation, and may even cause irreversible physical damage. Therefore, introducing a reliable voltage output control circuit is crucial. Utility Model Content

[0004] This invention provides a voltage output control circuit to control the output voltage, thereby ensuring the power supply stability of the power supply equipment.

[0005] To achieve the above objectives, this utility model provides a voltage output control circuit, which includes: a voltage sampling module, a voltage detection module, and an output control module;

[0006] The input terminal of the voltage sampling module serves as the receiving terminal of the input voltage; the output terminal of the voltage sampling module is electrically connected to the voltage detection module; the voltage detection module is electrically connected to the control terminal of the output control module; the input terminal of the output control module is electrically connected to the input terminal of the voltage sampling module; the output terminal of the output control module serves as the output terminal of the input voltage.

[0007] The voltage detection module is used to output a control signal to the output control module according to the magnitude of the input voltage, so that the output control module controls whether the input voltage is output according to the control signal.

[0008] Optionally, the voltage detection module includes a first voltage reference unit, a first voltage comparison unit, a second voltage reference unit, a second voltage comparison unit, a first output unit, and a second output unit;

[0009] The first voltage reference unit is electrically connected to the first input terminal of the first voltage comparison unit; the second input terminal of the first voltage comparison unit and the first input terminal of the second voltage comparison unit are both electrically connected to the output terminal of the voltage sampling module; the second voltage reference unit is electrically connected to the second input terminal of the second voltage comparison unit.

[0010] The output terminal of the first voltage comparison unit is electrically connected to the control terminal of the output control module through the first output unit;

[0011] The output terminal of the second voltage comparison unit is electrically connected to the control terminal of the output control module through the second output unit.

[0012] Optionally, the voltage detection module further includes: a first filtering unit and a second filtering unit;

[0013] The output terminal of the first voltage comparison unit is electrically connected to the first output unit through the first filter unit;

[0014] The output terminal of the second voltage comparison unit is electrically connected to the first output unit through the second filter unit.

[0015] Optionally, the first voltage reference unit includes a first resistor and a second resistor; the first voltage comparison unit includes a first comparator;

[0016] The first output unit includes a first diode;

[0017] The first end of the first resistor is electrically connected to a voltage source, and the second end of the first resistor is electrically connected to the first end of the second resistor; the second end of the second resistor is grounded; the second end of the first resistor is also electrically connected to the first end of the first comparator; the second end of the first comparator is electrically connected to the output end of the voltage detection module; the output end of the first comparator is electrically connected to the first end of the first diode; and the second end of the first diode is electrically connected to the control end of the output control module.

[0018] Optionally, the first voltage reference unit includes a third resistor and a fourth resistor; the second voltage comparison unit includes a second comparator; and the second output unit includes a second diode.

[0019] The first end of the third resistor is electrically connected to the voltage source, and the second end of the third resistor is electrically connected to the first end of the fourth resistor; the second end of the fourth resistor is grounded; the second end of the third resistor is also electrically connected to the first end of the second comparator; the second end of the second comparator is electrically connected to the output end of the voltage detection module; the output end of the second comparator is electrically connected to the first end of the second diode; and the second end of the second diode is electrically connected to the control end of the output control module.

[0020] Optionally, the second voltage comparison unit further includes a third diode;

[0021] The first terminal of the third diode is electrically connected to the output terminal of the second comparator; the second terminal of the third diode is electrically connected to the first terminal of the second comparator.

[0022] Optionally, the first filtering unit includes a first capacitor; the second filtering unit includes a second capacitor;

[0023] The first terminal of the first capacitor is electrically connected to the output terminal of the first voltage comparison unit; the second terminal of the first capacitor is grounded.

[0024] The first terminal of the second capacitor is electrically connected to the output terminal of the second voltage comparison unit; the second terminal of the second capacitor is grounded.

[0025] Optionally, the voltage sampling module includes a fifth resistor and a sixth resistor;

[0026] The first end of the fifth resistor serves as the input terminal of the voltage sampling module, and the second end of the fifth resistor is electrically connected to the first end of the sixth resistor and the input terminal of the voltage detection module; the second end of the sixth resistor is grounded.

[0027] Optionally, the circuit further includes: a sampling and filtering module; the output terminal of the voltage sampling module is electrically connected to the voltage detection module through the sampling and filtering module.

[0028] Optionally, the output control module includes a first transistor;

[0029] The control terminal of the first transistor is electrically connected to the output terminal of the voltage detection module; the first terminal of the first transistor is electrically connected to the input terminal of the voltage sampling module; and the second terminal of the first transistor serves as the output terminal of the output control module.

[0030] In this embodiment of the invention, the output terminal of the voltage sampling module is electrically connected to the voltage detection module; the voltage detection module is electrically connected to the control terminal of the output control module; the input terminal of the output control module is electrically connected to the input terminal of the voltage sampling module; the output terminal of the output control module serves as the output terminal of the input voltage; thus, the voltage detection module outputs a control signal to the output control module according to the magnitude of the input voltage, and the output control module controls whether the input voltage is output according to the control signal, thereby achieving control over the output voltage and thus satisfying the power supply stability of the power supply equipment.

[0031] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this utility model, nor is it intended to limit the scope of this utility model. Other features of this utility model will become readily apparent from the following description. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of a voltage output control circuit provided in an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the specific structure of a voltage output control circuit provided in an embodiment of this utility model;

[0035] Figure 3 This is a schematic diagram of another voltage output control circuit provided in this embodiment of the present invention.

[0036] Figure 4 This is a circuit diagram of a voltage output control circuit provided in an embodiment of the present utility model;

[0037] Figure 5 This is a circuit diagram of another voltage output control circuit provided in an embodiment of the present invention. Detailed Implementation

[0038] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0039] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0040] Figure 1This is a schematic diagram of a voltage output control circuit provided in an embodiment of the present invention; as shown below. Figure 1 As shown, the voltage output control circuit includes: a voltage sampling module 10, a voltage detection module 20, and an output control module 30;

[0041] The input terminal of the voltage sampling module 10 serves as the receiving terminal of the input voltage; the output terminal of the voltage sampling module 10 is electrically connected to the voltage detection module 20; the voltage detection module 20 is electrically connected to the control terminal of the output control module 30; the input terminal of the output control module 30 is electrically connected to the input terminal of the voltage sampling module 10; the output terminal of the output control module 30 serves as the output terminal of the input voltage.

[0042] The voltage detection module 20 is used to output a control signal to the output control module 30 according to the magnitude of the input voltage, so that the output control module 30 controls whether the input voltage is output according to the control signal.

[0043] The voltage sampling module 10 can be a voltage divider circuit to sample the input voltage; the voltage detection module 20 can output a control signal according to the magnitude of the input voltage; the voltage detection module 20 can be any circuit, and this embodiment does not limit it; the output control module 30 controls whether the input voltage is output according to the control signal; the output control module 30 can be any circuit, and this embodiment does not limit it.

[0044] Specifically, when the input voltage is normal, a first control signal is output to the output control module 30, and the output control module 30 controls the input voltage output according to the first control signal; when the input voltage increases, a second control signal is output to the output control module 30, and the output control module 30 controls the input voltage not to be output according to the second control signal; when the input voltage decreases, a third control signal is output to the output control module 30, and the output control module 30 controls the input voltage not to be output according to the third control signal.

[0045] In this invention, the voltage detection module 20 outputs a control signal to the output control module 30 based on the magnitude of the input voltage. The output control module 30 then controls whether the input voltage is output based on the control signal, thereby achieving control over the output voltage and ensuring the power supply stability of the power supply equipment.

[0046] Optionally, based on the above embodiments, each module can be further refined. Figure 2 This is a schematic diagram of the specific structure of a voltage output control circuit provided in an embodiment of this utility model; as shown below. Figure 2 As shown,

[0047] The voltage detection module 20 includes a first voltage reference unit 21, a first voltage comparison unit 22, a second voltage reference unit 23, a second voltage comparison unit 24, a first output unit 25, and a second output unit 26;

[0048] The first voltage reference unit 21 is electrically connected to the first input terminal of the first voltage comparison unit 22; the second input terminal of the first voltage comparison unit 22 and the first input terminal of the second voltage comparison unit 24 are both electrically connected to the output terminal of the voltage sampling module 10; the second voltage reference unit 23 is electrically connected to the second input terminal of the second voltage comparison unit 24; the output terminal of the first voltage comparison unit 22 is electrically connected to the control terminal of the output control module 30 through the first output unit 25; the output terminal of the second voltage comparison unit 24 is electrically connected to the control terminal of the output control module 30 through the second output unit 26.

[0049] Specifically, the first voltage reference unit 21 can provide a first reference voltage Vref1; the second voltage reference unit 23 can provide a second reference voltage Vref2. When the input voltage is normal, the first voltage comparison unit 21 outputs a first level signal based on the input voltage detected by the voltage detection module 10 and the first reference voltage Vref1. The first level signal is then output to the output control module 30 via the first output unit 25. Simultaneously, the second voltage comparison unit 24 also outputs a first level signal based on the input voltage detected by the voltage detection module 10 and the second reference voltage Vref2. The first level signal is then output to the output control module 30 via the second output unit 26. The output control module 30 then controls the input voltage output based on the simultaneously received first level signal (i.e., the first control signal).

[0050] When the input voltage increases, the first voltage comparison unit 21 outputs a second level signal based on the input voltage detected by the voltage detection module 10 and the first reference voltage Vref1; the second level signal is output to the output control module 30 through the first output unit 25; the output control module 30 then controls the output without input voltage based on the second level signal (i.e., the second control signal) output by the first output module.

[0051] When the input voltage decreases, the second voltage comparison unit 24 outputs a second level signal based on the input voltage detected by the voltage detection module 10 and the second reference voltage Vref2; the second level signal is output to the output control module 30 through the second output unit 26; the output control module 30 then controls the output voltage not to be input based on the second level signal (i.e., the second control signal) output by the second output module 26.

[0052] Optional, Figure 3 This is a schematic diagram of another voltage output control circuit provided in this embodiment of the present invention; as shown below. Figure 3As shown, the voltage detection module 20 further includes: a first filtering unit 27 and a second filtering unit 28; the output terminal of the first voltage comparison unit 22 is electrically connected to the first output unit 25 through the first filtering unit 27; the output terminal of the second voltage comparison unit 24 is electrically connected to the second output unit 26 through the second filtering unit 28.

[0053] The first filtering unit 27 filters the signal output from the first output unit 25, and the second filtering unit 28 filters the signal output from the second output unit 26. This allows the output control module 30 to reliably control whether the input voltage is output, avoiding malfunctions. The first filtering unit 27 can be composed of multiple capacitors or multiple resistors, without limitation; the second filtering unit 28 can also be composed of multiple capacitors or multiple resistors, without limitation.

[0054] Optional, Figure 4 This is a circuit diagram of a voltage output control circuit provided in an embodiment of the present invention; as shown below. Figure 4 As shown, the first voltage reference unit 21 in this circuit includes a first resistor R1 and a second resistor R2; the first voltage comparison unit 22 includes a first comparator U1; and the first output unit 25 includes a first diode D1.

[0055] The first end of the first resistor R1 is electrically connected to the voltage source VCC, and the second end of the first resistor R1 is electrically connected to the first end of the second resistor R2. The second end of the second resistor R2 is connected to signal ground. The second end of the first resistor R1 is also electrically connected to the first end of the first comparator U1. The second end of the first comparator U1 is electrically connected to the output end of the voltage detection module 10. The output end of the first comparator U1 is electrically connected to the first end of the first diode D1. The second end of the first diode D1 is electrically connected to the control end of the output control module 30. The voltage source VCC is also electrically connected to the positive power supply end of the first comparator U1. The negative power supply end of the first comparator U1 is grounded.

[0056] Optional, continue to refer to Figure 4 The second voltage reference unit 23 includes a third resistor R3 and a fourth resistor R4; the second voltage comparison unit 24 includes a second comparator U2; the second output unit 26 includes a second diode D2; the first terminal of the third resistor R3 is electrically connected to the voltage source VCC, and the second terminal of the third resistor R3 is electrically connected to the first terminal of the fourth resistor R4; the second terminal of the fourth resistor R4 is grounded; the second terminal of the third resistor R3 is also electrically connected to the first terminal of the second comparator U2; the second terminal of the second comparator U2 is electrically connected to the output terminal of the voltage detection module 10; the output terminal of the second comparator U2 is electrically connected to the first terminal of the second diode D2; and the second terminal of the second diode D2 is electrically connected to the control terminal of the output control module 30.

[0057] Specifically, when the input voltage is normal, the voltage source VCC outputs a first reference voltage Vref1 to the first input terminal of the first comparator U1 after being divided by the first resistor R1 and the second resistor R2. Thus, the first reference voltage at the first input terminal of the first comparator U1 is less than the voltage at its second input terminal (the input voltage input to the voltage detection module 10). Therefore, the first comparator U1 outputs a low level. This low level is then output to the output control module 30 through the first diode D1. Simultaneously, the voltage source VCC outputs a second reference voltage Vref2 to the second input terminal of the second comparator U1 after being divided by the third resistor R1 and the fourth resistor R2. Thus, the second reference voltage at the second input terminal of the second comparator U2 is greater than the voltage at its first input terminal (the input voltage input to the voltage detection module 10). Therefore, the second comparator U2 outputs a low level. The output control module 30 then controls the input voltage output based on the simultaneously received low level (i.e., the first control signal).

[0058] When the input voltage increases, the voltage at the second input terminal of the first comparator U1 (the input voltage input to the voltage detection module 10) is less than the first reference voltage at its first input terminal; then the first comparator U1 outputs a high level; the high level is output to the output control module 30 through the first diode D1; the output control module 30 then controls the output without input voltage based only on the high level (i.e., the second control signal);

[0059] When the input voltage decreases, the second reference voltage at the second input terminal of the second comparator U2 is less than the voltage at its first input terminal (the input voltage of the voltage detection module 10), so the second comparator U2 outputs a high level; the high level is output to the output control module 30 through the second diode D2; the output control module 30 then controls the output voltage not to be input only according to the high level (i.e. the third control signal).

[0060] Optional, continue to refer to Figure 4 The second voltage comparison unit 24 also includes a third diode D3; the first terminal of the third diode D3 is electrically connected to the output terminal of the second comparator U2; the second terminal of the third diode D3 is electrically connected to the first terminal of the second comparator U2. The third diode D3 can act as a protection latch-up mechanism when the second comparator U2 outputs a high level.

[0061] Optional, continue to refer to Figure 4The first filter unit 27 includes a first capacitor C1; the second filter unit includes a second capacitor C2; the first terminal of the first capacitor C1 is electrically connected to the output terminal of the first voltage comparison unit 22 (i.e., the output terminal of the first comparator U1); the second terminal of the first capacitor C1 is grounded; the first terminal of the second capacitor C2 is electrically connected to the output terminal of the second voltage comparison unit 24 (i.e., the output terminal of the second comparator U2); the second terminal of the second capacitor C2 is grounded. The first capacitor C1 and the second capacitor C2 serve as filters, thereby improving the reliability of the output control.

[0062] Optional, continue to refer to Figure 4 The voltage sampling module 10 includes a fifth resistor R5 and a sixth resistor R6. The first terminal of the fifth resistor R5 serves as the input terminal VIN+ of the voltage sampling module 10. The second terminal of the fifth resistor R5 is electrically connected to the first terminal of the sixth resistor R6 and the input terminal of the voltage detection module 10 (i.e., the second terminal of the first comparator U1 and the first terminal of the second comparator U2). The second terminal of the sixth resistor R6 is connected to the signal ground VIN-. The voltage sampling module 10 incorporates a voltage divider circuit, which serves to acquire the input voltage.

[0063] Optional, continue to refer to Figure 4 The circuit further includes a sampling and filtering module 40; the output terminal of the voltage sampling module 10 is electrically connected to the voltage detection module 20 through the sampling and filtering module 40. The sampling and filtering module 40 filters the input voltage. The sampling and filtering module 40 can use multiple capacitors or multiple resistors; this embodiment does not limit this. In some embodiments, the sampling and filtering module 40 may include a third capacitor C3 and a seventh resistor R7; the first terminal of the third capacitor C3 is electrically connected to the first terminal of the sixth resistor R6 and the first terminal of the seventh resistor R7; the second terminal of the third capacitor C3 is connected to signal ground; the second terminal of the seventh resistor R7 is electrically connected to the input terminal of the voltage detection module 20 (i.e., to the second terminal of the first comparator U1 and the first terminal of the second comparator U1).

[0064] Optional, continue to refer to Figure 4The output control module 30 includes a first transistor Q1. The control terminal of the first transistor Q1 is electrically connected to the output terminal of the voltage detection module 20 (i.e., to the second terminal of the first diode D1 and the second terminal of the second diode D2). The first terminal of the first transistor Q1 is electrically connected to the input terminal of the voltage sampling module 10 (i.e., the first terminal of the fifth resistor R5). The second terminal of the first transistor Q1 serves as the output terminal of the output control module 30. The first transistor can be a PMOS transistor. When both the second terminals of the first diode D1 and the second terminal of the second diode D2 output a low level, the first transistor Q1 is enabled. When the second terminal of the first diode D1 outputs a high level, the first transistor Q1 is disabled. When the second terminal of the second diode D2 outputs a high level, the first transistor Q1 is disabled.

[0065] It should be noted that the output control module 30 can also be a combination of transistors. Specifically, Figure 5 This is a circuit diagram of another voltage output control circuit provided in an embodiment of the present invention; as shown. Figure 5 As shown, the output control module 30 includes a first transistor and a second transistor; the control terminal of the first transistor is electrically connected to the output terminal of the voltage detection module 20 (i.e., to the second terminal of the first diode D1 and the second terminal of the second diode D2); the first terminal of the first transistor is electrically connected to the control terminal of the second transistor; the second terminal of the first transistor is grounded, and the first terminal of the second transistor is electrically connected to the input terminal of the voltage sampling module 10 (i.e., the first terminal of the fifth resistor R5); the second terminal of the second transistor Q serves as the output terminal of the output control module 30.

[0066] In this embodiment, the first transistor is an NMOS transistor, and the second transistor is a PMOS transistor. When both the second terminals of the first diode D1 and the second diode D2 output a low level, the first transistor is disabled, and the second transistor is enabled, thus allowing the input voltage to be output normally. When the second terminal of the first diode D1 outputs a high level, the first transistor is enabled, and the second transistor is disabled, thus allowing the input voltage to be output normally. When the second terminal of the second diode D2 outputs a high level, the first transistor is enabled, and the second transistor is disabled, thus allowing the input voltage to be output normally.

[0067] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A voltage output control circuit, characterized in that, include: Voltage sampling module, voltage detection module and output control module; The input terminal of the voltage sampling module serves as the receiving terminal of the input voltage; the output terminal of the voltage sampling module is electrically connected to the voltage detection module; the voltage detection module is electrically connected to the control terminal of the output control module; the input terminal of the output control module is electrically connected to the input terminal of the voltage sampling module; the output terminal of the output control module serves as the output terminal of the input voltage. The voltage detection module is used to output a control signal to the output control module according to the magnitude of the input voltage, so that the output control module controls whether the input voltage is output according to the control signal.

2. The voltage output control circuit according to claim 1, characterized in that, The voltage detection module includes a first voltage reference unit, a first voltage comparison unit, a second voltage reference unit, a second voltage comparison unit, a first output unit, and a second output unit; The first voltage reference unit is electrically connected to the first input terminal of the first voltage comparison unit; The second input terminal of the first voltage comparison unit and the first input terminal of the second voltage comparison unit are both electrically connected to the output terminal of the voltage sampling module; the second voltage reference unit is electrically connected to the second input terminal of the second voltage comparison unit. The output terminal of the first voltage comparison unit is electrically connected to the control terminal of the output control module through the first output unit; The output terminal of the second voltage comparison unit is electrically connected to the control terminal of the output control module through the second output unit.

3. The voltage output control circuit according to claim 2, characterized in that, The voltage detection module further includes: a first filtering unit and a second filtering unit; The output terminal of the first voltage comparison unit is electrically connected to the first output unit through the first filter unit; The output terminal of the second voltage comparison unit is electrically connected to the first output unit through the second filter unit.

4. The voltage output control circuit according to claim 2, characterized in that, The first voltage reference unit includes a first resistor and a second resistor; the first voltage comparison unit includes a first comparator; The first output unit includes a first diode; The first end of the first resistor is electrically connected to a voltage source, and the second end of the first resistor is electrically connected to the first end of the second resistor; the second end of the second resistor is connected to signal ground; the second end of the first resistor is also electrically connected to the first end of the first comparator; the second end of the first comparator is electrically connected to the output end of the voltage detection module; the output end of the first comparator is electrically connected to the first end of the first diode; and the second end of the first diode is electrically connected to the control end of the output control module.

5. The voltage output control circuit according to claim 2, characterized in that, The first voltage reference unit includes a third resistor and a fourth resistor; the second voltage comparison unit includes a second comparator; the second output unit includes a second diode; The first end of the third resistor is electrically connected to the voltage source, and the second end of the third resistor is electrically connected to the first end of the fourth resistor; the second end of the fourth resistor is grounded; the second end of the third resistor is also electrically connected to the first end of the second comparator; the second end of the second comparator is electrically connected to the output end of the voltage detection module; the output end of the second comparator is electrically connected to the first end of the second diode; and the second end of the second diode is electrically connected to the control end of the output control module.

6. The voltage output control circuit according to claim 5, characterized in that, The second voltage comparison unit also includes a third diode; The first terminal of the third diode is electrically connected to the output terminal of the second comparator; the second terminal of the third diode is electrically connected to the first terminal of the second comparator.

7. The voltage output control circuit according to claim 3, characterized in that, The first filtering unit includes a first capacitor; the second filtering unit includes a second capacitor; The first terminal of the first capacitor is electrically connected to the output terminal of the first voltage comparison unit; the second terminal of the first capacitor is grounded. The first terminal of the second capacitor is electrically connected to the output terminal of the second voltage comparison unit; the second terminal of the second capacitor is grounded.

8. The voltage output control circuit according to claim 1, characterized in that, The voltage sampling module includes a fifth resistor and a sixth resistor; The first end of the fifth resistor serves as the input terminal of the voltage sampling module, and the second end of the fifth resistor is electrically connected to the first end of the sixth resistor and the input terminal of the voltage detection module; the second end of the sixth resistor is grounded.

9. The voltage output control circuit according to claim 1, characterized in that, Also includes: A sampling and filtering module; the output terminal of the voltage sampling module is electrically connected to the voltage detection module through the sampling and filtering module.

10. The voltage output control circuit according to claim 1, characterized in that, The output control module includes a first transistor; The control terminal of the first transistor is electrically connected to the output terminal of the voltage detection module; the first terminal of the first transistor is electrically connected to the input terminal of the voltage sampling module; and the second terminal of the first transistor serves as the output terminal of the output control module.

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