Reset protection circuit and electronic equipment

Abstract

The utility model discloses a reset protection circuit and electronic equipment. The reset protection circuit comprises a charging and discharging module, a comparison module and a voltage regulation module; the charging and discharging module is connected with a first power supply, is used for charging according to the first power supply and is connected with a reset signal, and the reset signal is used for controlling the charging and discharging module to discharge; a first input end of the comparison module is connected with the charging and discharging module, a second input end of the comparison module is connected with the voltage regulation module, the voltage regulation module is connected to a second power supply, and an output end of the comparison module is connected with the processor; the voltage adjusting module is used for outputting adjustable reference voltage, and the comparison module is used for comparing discharging voltage of the charging and discharging module with the reference voltage and then outputting a control signal to control the processor to reset. The reset protection circuit provided by the utility model can reasonably control the reset protection delay time.

Description

Technical Field

[0001] This utility model relates to the field of power electronics technology, and in particular to a reset protection circuit and electronic device. Background Technology

[0002] The reset protection circuit ensures that critical components such as chips and processors in an electronic system start up in the appropriate initial state, and when an abnormal situation is encountered during operation, it forces the relevant components to reset to the initial set state, so as to protect the system from erroneous operation and damage and ensure that the system can operate normally and stably in the future.

[0003] Currently, reset circuits typically include watchdog reset circuits and power supply monitoring chip reset circuits. For example, when the power supply voltage is lower or higher than a preset threshold, the chip's internal comparator compares and judges the voltage. Once the power supply voltage exceeds the normal range, the power monitoring chip immediately generates a reset signal, triggering a system reset. During power-on or power-off, power supply voltage fluctuations can cause system instability and safety hazards because the aforementioned reset circuit immediately generates a reset signal when the power supply voltage exceeds the normal range. Utility Model Content

[0004] This invention provides a reset protection circuit and electronic device to solve the problem that the reset circuit in the prior art generates a reset signal quickly, leading to system instability.

[0005] According to one aspect of the present invention, a reset protection circuit is provided, including a charge / discharge module, a comparison module, and a voltage regulation module;

[0006] The charging and discharging module is connected to a first power source, and is used to charge according to the first power source. The charging and discharging module is connected to a reset signal, and the reset signal is used to control the charging and discharging module to discharge.

[0007] The first input terminal of the comparison module is connected to the charge / discharge module, the second input terminal of the comparison module is connected to the voltage regulation module, the voltage regulation module is connected to a second power supply, and the output terminal of the comparison module is connected to the processor. The voltage regulation module is used to output an adjustable reference voltage, and the comparison module is used to compare the discharge voltage of the charge / discharge module with the reference voltage and then output a control signal to control the processor to reset.

[0008] Optionally, the charge / discharge module includes a charge storage unit and a discharge regulation unit. The first end of the charge storage unit serves as the output end of the charge / discharge module and is connected to the first end of the discharge regulation unit and the first input end of the comparison module. The second end of the charge storage unit is grounded, and the second end of the discharge regulation unit serves as the input end of the charge / discharge module. The charge storage unit is used to charge according to the first power supply, the reset signal is used to control the discharge of the charge storage unit, and the discharge regulation unit is used to adjust the discharge parameters of the charge storage unit.

[0009] Optionally, the charge storage unit includes a first capacitor, with a first terminal of the first capacitor serving as the first terminal of the charge storage unit and a second terminal of the first capacitor serving as the second terminal of the charge storage unit; the discharge regulation unit includes a first resistor, with a first terminal of the first resistor serving as the first terminal of the discharge regulation unit and a second terminal of the first resistor serving as the second terminal of the discharge regulation unit.

[0010] Optionally, the reset protection circuit further includes a reset chip, which is used to output the reset signal.

[0011] Optionally, the reset protection circuit further includes a unidirectional conduction module, the first end of which is connected to the charging and discharging module, and the second end of which is connected to the reset chip. The unidirectional conduction module is used to conduct unidirectionally according to the discharge voltage of the charging and discharging module.

[0012] Optionally, the unidirectional conduction module includes a first diode, with a first end of the first diode serving as the first end of the unidirectional conduction module and a second end of the first diode serving as the second end of the unidirectional conduction module.

[0013] Optionally, the comparison module includes an operational amplifier, wherein the non-inverting input terminal of the operational amplifier serves as the first input terminal of the comparison module, the inverting input terminal of the operational amplifier serves as the second input terminal of the comparison module, and the output terminal of the operational amplifier serves as the output terminal of the comparison module.

[0014] Optionally, the reset protection circuit further includes a pull-up module, which is connected to the output of the comparison module and is used to pull up the voltage value of the control signal to a preset voltage.

[0015] Optionally, the pull-up module includes a second resistor, the first end of which is connected to a third power supply, and the second end of which is connected to the output of the comparator module.

[0016] According to another aspect of the present invention, an electronic device is provided, including the aforementioned reset protection circuit.

[0017] The technical solution of this utility model embodiment includes a reset protection circuit comprising a charging / discharging module, a comparison module, and a voltage regulation module. The charging / discharging module is connected to a first power supply and is used to charge according to the first power supply. A reset signal is also connected to the charging / discharging module, and the reset signal is used to control the charging / discharging module to discharge. The first input terminal of the comparison module is connected to the charging / discharging module, and the second input terminal of the comparison module is connected to the voltage regulation module. The voltage regulation module outputs an adjustable reference voltage. The comparison module compares the discharge voltage of the charging / discharging module with the reference voltage and then outputs a control signal to control the processor to reset. The reset signal controls the charging / discharging module to discharge. The change process of the discharge voltage of the charging / discharging module is determined by the discharge parameters of the charging / discharging module. The magnitude of the reference voltage can be adjusted by the voltage regulation module. Therefore, by adjusting the reference voltage and the discharge parameters of the charging / discharging module, the comparison module outputs a control signal after meeting the set delay time, thus achieving reasonable control of the reset protection delay time, improving system stability, and solving the problem of system instability caused by the rapid generation of a reset signal by the reset circuit in the prior art.

[0018] 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

[0019] 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.

[0020] Figure 1 This is a schematic diagram of a reset protection circuit provided in an embodiment of the present invention;

[0021] Figure 2 This is a circuit diagram of a reset protection circuit provided in an embodiment of this utility model;

[0022] Figure 3 This is a circuit diagram of another reset protection circuit provided in an embodiment of this utility model;

[0023] Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this utility model. Detailed Implementation

[0024] 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.

[0025] 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.

[0026] This utility model embodiment provides a reset protection circuit. Figure 1 This is a schematic diagram of a reset protection circuit provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the reset protection circuit 100 includes a charge / discharge module 110, a comparison module 120, and a voltage regulation module 130. The charge / discharge module 110 is connected to a first power supply V1 and is used to charge according to the first power supply V1. The charge / discharge module 110 is connected to a reset signal RST, which is used to control the charge / discharge module 110 to discharge. The first input terminal of the comparison module 120 is connected to the charge / discharge module 110, and the second input terminal of the comparison module 120 is connected to the voltage regulation module 130. The voltage regulation module 130 is connected to a second power supply V2, and the output terminal of the comparison module 120 is connected to the processor. The voltage regulation module 130 is used to output an adjustable reference voltage, and the comparison module 120 is used to compare the discharge voltage of the charge / discharge module 110 with the reference voltage and then output a control signal to control the processor to reset.

[0027] In this embodiment of the invention, the reset protection circuit 100 is a circuit that restores the system to its initial state. The charge / discharge module 110 is a module with charging and discharging functions; for example, the charge / discharge module 110 includes charge storage elements. The comparison module 120 is a module that outputs a corresponding logic level by comparing the magnitudes of two input signals; for example, the comparison module 120 includes comparators. The voltage regulation module 130 is a module that converts the input voltage into a stable and adjustable target output voltage; for example, the voltage regulation module 130 includes voltage converters, voltage regulators, and other components.

[0028] In this embodiment of the invention, the charging / discharging module 110 charges according to the first power supply V1. The voltage of the charging / discharging module 110 when fully charged is equal to the voltage of the first power supply V1. The reference voltage output by the voltage regulation module 130 is less than the voltage of the first power supply, and the comparison module 120 outputs a low-level signal, rendering the control signal output by the comparison module 120 invalid. When a reset signal is received by the charging / discharging module 110 (e.g., a low-level reset signal), the charging / discharging module 110 discharges. The comparison module 120 compares the discharge voltage of the charging / discharging module 110 with the reference voltage. When the discharge voltage of the charging / discharging module 110 is less than or equal to the reference voltage, the comparison module 120 outputs a high-level signal, rendering the control signal output by the comparison module 120 valid, and the processor resets according to the control signal. By adjusting the reference voltage and the discharge parameters of the charging / discharging module, the comparator outputs a valid control signal after meeting the set delay time, thus achieving reasonable control of the reset protection delay time.

[0029] In this embodiment, the reset protection circuit includes a charging / discharging module, a comparison module, and a voltage regulation module. The charging / discharging module is connected to a first power source and is used to charge according to the first power source. A reset signal is also connected to the charging / discharging module to control its discharge. The first input terminal of the comparison module is connected to the charging / discharging module, and the second input terminal is connected to the voltage regulation module. The voltage regulation module outputs an adjustable reference voltage. The comparison module compares the discharge voltage of the charging / discharging module with the reference voltage and then outputs a control signal to control the processor reset. The reset signal controls the discharge of the charging / discharging module. The change in the discharge voltage of the charging / discharging module is determined by its discharge parameters. The magnitude of the reference voltage can be adjusted by the voltage regulation module. Therefore, by adjusting the reference voltage and the discharge parameters of the charging / discharging module, the comparison module outputs a control signal after meeting a set delay time. This allows for reasonable control of the reset protection delay time, improving system stability and solving the problem of system instability caused by the rapid generation of a reset signal in the prior art.

[0030] Figure 2 This is a circuit diagram of a reset protection circuit provided in an embodiment of this utility model, as shown below. Figure 2As shown, the charge / discharge module 110 includes a charge storage unit 111 and a discharge regulation unit 112. The first end of the charge storage unit 111 serves as the output end of the charge / discharge module 110 and is connected to the first end of the discharge regulation unit 112 and the first input end of the comparison module 120. The second end of the charge storage unit 111 is grounded, and the second end of the discharge regulation unit 112 serves as the input end of the charge / discharge module 110. The charge storage unit 111 is used to charge according to the first power supply V1, the reset signal RST is used to control the discharge of the charge storage unit 111, and the discharge regulation unit 112 is used to adjust the discharge parameters of the charge storage unit 111.

[0031] In this embodiment of the invention, the charge storage unit 111 is a unit for storing charge, including electronic components for storing charge, such as capacitors. The discharge adjustment unit 112 is a unit for adjusting the discharge process of the charge storage unit 111; for example, the discharge adjustment unit 112 can adjust the discharge duration of the charge storage unit 111. Referring to the above embodiment, the charge storage unit 111 is charged according to the first power supply V1 until the charging voltage of the charge storage unit 111 is equal to the voltage of the first power supply V1. Since the reference voltage is less than the voltage of the first power supply, the comparison module 120 outputs a low-level signal. When the charge / discharge module 110 receives a reset signal, the charge storage unit 111 discharges, and the discharge adjustment unit 112 adjusts the discharge duration of the charge storage unit 111. The comparison module 120 compares the discharge voltage of the charge storage unit 111 with the reference voltage. When the discharge voltage of the charge storage unit 111 is less than or equal to the reference voltage, the comparison module 120 outputs a high-level signal, the control signal output by the comparison module 120 is valid, and the processor resets according to the control signal.

[0032] Specifically, the charge storage unit 111 includes a first capacitor C1, with the first end of the first capacitor C1 serving as the first end of the charge storage unit 111 and the second end of the first capacitor C1 serving as the second end of the charge storage unit 111; the discharge regulation unit 112 includes a first resistor R1, with the first end of the first resistor R1 serving as the first end of the discharge regulation unit 112 and the second end of the first resistor R1 serving as the second end of the discharge regulation unit 112.

[0033] In this embodiment of the invention, the reset protection circuit further includes a third resistor R3. The first power supply V1 charges the first capacitor C1 through the third resistor R3 and the first resistor R1 until the first capacitor C1 is fully charged. At this point, the voltage of the first capacitor C1 is equal to the voltage of the first power supply V1. When a reset signal is input, the first capacitor C1 begins to discharge. When the discharge voltage of the first capacitor C1 is less than or equal to the reference voltage, the comparator module 120 outputs a valid control signal to control the processor to reset. The first capacitor C1 is a variable capacitor, and the first resistor R1 is a variable resistor. By adjusting the capacitance value of the first capacitor C1 and the resistance value of the first resistor R1, the discharge duration of the first capacitor C1 is adjusted, thereby achieving reasonable control of the reset protection delay time.

[0034] Figure 3 This is a circuit diagram of another reset protection circuit provided in an embodiment of this utility model, as shown below. Figure 3 As shown, the reset protection circuit also includes a reset chip U1, which is used to output a reset signal RST.

[0035] In this embodiment of the invention, the reset chip U1 is a chip with a reset function. The reset chip U1 is connected to the processor and controls the processor to reset under specific conditions, enabling the processor to initialize to a defined initial state and ensuring the normal and stable startup and operation of the system. For example, when the reset chip U1 detects a power supply failure in the processor, it outputs a reset signal RES.

[0036] Continue to refer to Figure 3 The reset protection circuit also includes a unidirectional conduction module 310. The first end of the unidirectional conduction module 310 is connected to the charge-discharge module 110, and the second end of the unidirectional conduction module 310 is connected to the reset chip U1. The unidirectional conduction module 310 is used to conduct unidirectionally according to the discharge voltage of the charge-discharge module 110.

[0037] In this embodiment of the invention, the unidirectional conduction module 310 is a module that allows current to flow in one direction and prevents reverse current from flowing. Referring to the above embodiment, the reset signal is a low-level signal, and the reset signal controls the charging and discharging module 110 to discharge. The unidirectional conduction module 310 can ensure that the discharge current of the charging and discharging module 110 flows to the reset chip and prevents reverse current from flowing.

[0038] Specifically, the unidirectional conduction module 310 includes a first diode D1, the first end of the first diode D1 serves as the first end of the unidirectional conduction module 310, and the second end of the first diode D1 serves as the second end of the unidirectional conduction module 310.

[0039] Based on the above embodiment, after the reset chip U1 outputs a reset signal, since the reset signal is a low-level signal, the charge / discharge module 110 discharges through the first diode D1. The first diode D1 ensures that the discharge current of the charge / discharge module 110 flows to the reset chip and prevents reverse current from passing through, which can improve the stability and safety of the circuit.

[0040] Continue to refer to Figure 3 The comparison module 120 includes an operational amplifier U2. The non-inverting input terminal of the operational amplifier U2 serves as the first input terminal of the comparison module 120, the inverting input terminal of the operational amplifier U2 serves as the second input terminal of the comparison module 120, and the output terminal of the operational amplifier U2 serves as the output terminal of the comparison module 120.

[0041] In this embodiment of the invention, the inverting input of operational amplifier U2 is connected to the output voltage of the charge / discharge module, and the non-inverting input of operational amplifier U2 is connected to a reference voltage. When the output voltage of the charge / discharge module is greater than the reference voltage, operational amplifier U2 outputs a low-level signal, meaning the control signal output by comparator module 120 is invalid. When the output voltage of charge / discharge module 110 is less than or equal to the reference voltage, operational amplifier U2 outputs a high-level signal, meaning the control signal output by operational amplifier U2 is valid, and the processor resets according to the control signal.

[0042] Continue to refer to Figure 3 The reset protection circuit also includes a pull-up module 320, which is connected to the output of the comparator module 120. The pull-up module 320 is used to pull up the voltage value of the control signal to a preset voltage.

[0043] In this embodiment of the invention, the pull-up module 320 clamps an uncertain signal to a high-level signal. Referring to the above embodiment, when the comparator module 210 outputs a low-level signal, the reset protection circuit outputs a low-level signal. When the comparator module 210 outputs a high-level signal, the pull-up module 320 pulls the voltage at the output terminal of the comparator module to a high level, making the high-level signal output by the reset protection circuit more stable, avoiding data transmission errors caused by level fluctuations, and improving signal accuracy.

[0044] Specifically, the pull-up module 320 includes a second resistor R2. The first end of the second resistor R2 is connected to the third power supply V3, and the second end of the second resistor R2 is connected to the output terminal of the comparator module 120. When the comparator module 210 outputs a high-level signal, the second resistor R2 pulls the voltage at the output terminal of the comparator module up to the voltage of the third power supply V3, making the high-level signal output by the reset protection circuit more stable.

[0045] In this embodiment of the invention, the reset protection circuit further includes a fourth resistor R4 and a second capacitor C2. The fourth resistor R4 and the second capacitor C2 constitute a filtering module to filter the level signal output by the comparison module, thereby improving signal stability. The reset protection circuit also includes a fifth resistor R5 and a sixth resistor R6. The voltage output by the voltage regulation module 130 is divided by the fifth resistor R5 and the sixth resistor R6 to output a reference voltage.

[0046] In this embodiment of the invention, the charging / discharging module 110 charges according to the first power supply V1. The voltage of the charging / discharging module 110 when fully charged is equal to the voltage of the first power supply V1. The reference voltage output by the voltage regulation module 130 is less than the voltage of the first power supply. The comparison module 120 outputs a low-level signal, and the control signal output by the comparison module 120 is invalid. When a reset signal is received by the charging / discharging module 110, the reset signal controls the charging / discharging module 110 to discharge. The comparison module 120 compares the discharge voltage of the charging / discharging module 110 with the reference voltage. When the discharge voltage of the charging / discharging module 110 is less than or equal to the reference voltage, the comparison module 120 outputs a high-level signal, and the control signal output by the comparison module 120 is valid. The processor resets according to the control signal. By adjusting the reference voltage and the discharge parameters of the charging / discharging module, the comparator outputs a valid control signal after meeting the set delay time, thus achieving reasonable control of the reset protection delay time. Furthermore, the reset protection circuit can be connected to multiple processors. When the power supply of any processor malfunctions, the reset protection circuit can simultaneously reset all processors.

[0047] This utility model embodiment also provides an electronic device. Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this utility model, as shown below. Figure 4 As shown, the electronic device 10 provided in this embodiment includes the reset protection circuit 100 in any of the above embodiments, and has the beneficial effects of the reset protection circuit in any of the above embodiments, which will not be described again here.

[0048] It should be understood that the various forms of the process shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this utility model can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this utility model can be achieved, and this is not limited herein.

[0049] The specific embodiments described above do not constitute a limitation on the scope of protection of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A reset protection circuit, characterized by comprising: The reset protection circuit comprises a charging and discharging module, a comparison module and a voltage regulating module. The charging and discharging module is connected to a first power supply and is configured to be charged by the first power supply, and the charging and discharging module is connected to a reset signal, and the reset signal is configured to control the discharging of the charging and discharging module. A first input end of the comparison module is connected to the charging and discharging module, a second input end of the comparison module is connected to the voltage regulating module, the voltage regulating module is connected to a second power supply, and an output end of the comparison module is connected to a processor; the voltage regulating module is configured to output an adjustable reference voltage, and the comparison module is configured to compare the discharging voltage of the charging and discharging module with the reference voltage and output a control signal to reset the processor.

2. The reset protection circuit of claim 1, wherein, The charging and discharging module comprises a charge storage unit and a discharging regulating unit, a first end of the charge storage unit is connected to an output end of the charging and discharging module, a first end of the discharging regulating unit, and a first input end of the comparison module, a second end of the charge storage unit is grounded, and a second end of the discharging regulating unit is connected to an input end of the charging and discharging module; the charge storage unit is configured to be charged by the first power supply, the reset signal is configured to control the discharging of the charge storage unit, and the discharging regulating unit is configured to regulate the discharging parameters of the charge storage unit.

3. The reset protection circuit of claim 2, wherein, The charge storage unit comprises a first capacitor, a first end of the first capacitor is connected to a first end of the charge storage unit, and a second end of the first capacitor is connected to a second end of the charge storage unit. The discharging regulating unit comprises a first resistor, a first end of the first resistor is connected to a first end of the discharging regulating unit, and a second end of the first resistor is connected to a second end of the discharging regulating unit.

4. The reset protection circuit of claim 1, wherein, The reset protection circuit further comprises a reset chip, and the reset chip is configured to output the reset signal.

5. The reset protection circuit of claim 4, wherein, The reset protection circuit further comprises a unidirectional conduction module, a first end of the unidirectional conduction module is connected to the charging and discharging module, a second end of the unidirectional conduction module is connected to the reset chip, and the unidirectional conduction module is configured to conduct unidirectionally according to the discharging voltage of the charging and discharging module.

6. The reset protection circuit of claim 5, wherein, The unidirectional conduction module comprises a first diode, a first end of the first diode is connected to a first end of the unidirectional conduction module, and a second end of the first diode is connected to a second end of the unidirectional conduction module.

7. The reset protection circuit of claim 1, wherein, The comparison module comprises an operational amplifier, a non-inverting input end of the operational amplifier is connected to a first input end of the comparison module, an inverting input end of the operational amplifier is connected to a second input end of the comparison module, and an output end of the operational amplifier is connected to an output end of the comparison module.

8. The reset protection circuit of claim 1, wherein, The reset protection circuit further comprises a pull-up module, the pull-up module is connected to the output end of the comparison module, and the pull-up module is configured to pull up the voltage value of the control signal to a preset voltage.

9. The reset protection circuit of claim 8, wherein, The pull-up module comprises a second resistor, a first end of the second resistor is connected to a third power supply, and a second end of the second resistor is connected to the output end of the comparison module.

10. An electronic device, comprising: The reset protection circuit comprises the reset protection circuit according to any one of claims 1-9.

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