CN220985310U - Protection circuit, power supply circuit and cleaning device - Google Patents

Abstract

The application relates to a protection circuit, a power supply circuit and cleaning equipment, wherein a current conversion module of the protection circuit is used for connecting a module to be tested so as to convert the current to be tested of the module to be tested into corresponding voltage to be tested; the bistable trigger module of the protection circuit is connected with the current conversion module and is used for being connected with the power supply module, and continuously outputting a latch signal to control the power supply module to stop supplying power under the condition that the voltage to be detected is larger than or equal to the adjustable threshold voltage and the bistable trigger module does not receive a reset signal. The adjustable threshold voltage compared with the voltage to be tested in the bistable trigger module is variable, so that the protection circuit can adapt to more modules to be tested. The bistable trigger module can output a recovery power supply signal to control the power supply module to recover power supply when the voltage to be detected is smaller than the adjustable threshold voltage or a reset signal is received, and the power supply of the power supply module is recovered through the hardware circuit while the recoverability of overcurrent protection is ensured, so that the recovery speed is accelerated.

Description

Protection circuit, power supply circuit and cleaning device

Technical Field

The application relates to the technical field of electronic circuits, in particular to a protection circuit, a power supply circuit and cleaning equipment.

Background

In the technical field of electronic circuits, a current is generally adopted to blow a fuse for overcurrent protection of the circuit, and when overload or short circuit occurs in the circuit, the fuse is blown, so that the circuit is disconnected, and the circuit and equipment are protected. But the fuse will not be reusable after blowing. The self-recovery fuse is generally suitable for circuit protection under the condition of short overload or overcurrent, when the robot equipment is in normal operation, the current is generally in the rated current range, but when the robot equipment starts to start or the load of an internal circuit is changed instantaneously, the current can temporarily exceed the rated current, and at the moment, the circuit self-recovery fuse can automatically recover, but the recovery time of the self-recovery fuse is longer, and the current protection value is not adjustable.

Disclosure of utility model

Based on this, it is necessary to provide a protection circuit, a power supply circuit, and a cleaning apparatus in view of the above technical problems.

In a first aspect, the present application provides a protection circuit comprising:

The current conversion module is used for connecting with the module to be tested so as to convert the current to be tested of the module to be tested into corresponding voltage to be tested;

And the bistable trigger module is connected with the current conversion module and used for being connected with the power supply module, and outputting a power restoration signal to control the power supply module to restore power supply under the condition that the voltage to be detected is smaller than the adjustable threshold voltage or the bistable trigger module receives a reset signal.

In one embodiment, the bistable trigger module is further configured to continuously output a latch signal to control the power supply module to stop supplying power when the voltage to be measured is greater than or equal to the adjustable threshold voltage and the bistable trigger module does not receive the reset signal.

In one embodiment, the bistable trigger module comprises:

The comparison unit is connected with the current conversion module and is used for connecting the power supply module, outputting a latch signal when the voltage to be detected is greater than or equal to the adjustable threshold voltage, and outputting a recovery power supply signal when the voltage to be detected is less than the adjustable threshold voltage;

and the latch unit is connected with the comparison unit and is used for outputting a driving signal to enable the comparison unit to continuously output the latch signal when the comparison unit outputs the latch signal and the latch unit does not receive the reset signal, and stopping outputting the driving signal when the comparison unit outputs the recovery power supply signal or the latch unit receives the reset signal.

In one embodiment, the method further comprises:

And the reset module is connected with the comparison unit and the latch unit and is used for connecting the module to be tested, detecting whether the module to be tested has an overcurrent fault or not when the comparison unit outputs a latch signal, and outputting a reset signal when the module to be tested does not have the overcurrent fault.

In one embodiment, the reset module includes:

The control unit is connected with the comparison unit and is used for connecting the module to be tested, detecting whether the module to be tested has an overcurrent fault or not when the comparison unit outputs a latch signal, and outputting a control signal when the module to be tested does not have the overcurrent fault;

And the reset unit is connected with the control unit and the latch unit and is used for outputting a reset signal to enable the latch unit to stop outputting the driving signal when the control unit outputs the control signal.

In one embodiment, the reset unit includes:

the driving subunit is connected with the control unit and used for converting the control signal into a reset signal when the control unit outputs the control signal;

And the first switch subunit is connected with the driving subunit, the latch unit and the grounding end and is used for conducting connection between the grounding end and the latch unit when the driving subunit outputs a reset signal so as to enable the latch unit to stop outputting the driving signal.

In one embodiment, the latch unit includes:

The second switch subunit is connected with the output end of the comparison unit and is used for being in a conducting state when the comparison unit outputs the latch signal and converting the latch signal into a conducting signal;

The first unidirectional conduction subunit comprises a conduction end and a cut-off end, the conduction end of the first unidirectional conduction subunit is connected with the second switch subunit, the cut-off end of the first unidirectional conduction subunit is connected with the input end of the comparison unit, and the first unidirectional conduction subunit is used for taking the conduction signal as a driving signal to enable the comparison unit to continuously output a latch signal before the second switch subunit outputs the conduction signal and the first unidirectional conduction subunit receives the reset signal.

In one embodiment, the comparison unit comprises:

The second unidirectional conduction subunit comprises a conduction end and a cut-off end, and the conduction end of the second unidirectional conduction subunit is connected with the current conversion module;

The filtering subunit is connected with the cut-off end of the second unidirectional conduction subunit;

And the comparison subunit is connected with the filtering subunit and is used for connecting the power supply module, and continuously outputting a latch signal to control the power supply module to stop supplying power when the voltage to be detected is greater than or equal to the adjustable threshold voltage and before the filtering subunit receives the reset signal.

In a second aspect, the present application also provides a power supply circuit, including:

A protection circuit as described above;

the module to be tested is connected with the current conversion module of the protection circuit and is used for outputting current to be tested;

and the power supply module is connected with the bistable trigger module of the protection circuit and used for stopping power supply when the bistable trigger module outputs a latch signal.

In a third aspect, the present application also provides a cleaning apparatus comprising:

Such as the protection circuit described above.

The protection circuit, the power supply circuit and the cleaning equipment comprise a current conversion module and a bistable trigger module. The current conversion module is used for connecting the module to be tested so as to convert the current to be tested of the module to be tested into corresponding voltage to be tested; the bistable trigger module is connected with the current conversion module and is used for being connected with the power supply module, and continuously outputting a latch signal to control the power supply module to stop supplying power under the condition that the voltage to be detected is larger than or equal to the adjustable threshold voltage and the bistable trigger module does not receive a reset signal. According to the protection circuit, on one hand, the adjustable threshold voltage compared with the voltage to be detected in the bistable trigger module is variable, so that the protection circuit can be adapted to more modules to be detected, and on the other hand, when the voltage to be detected is smaller than the adjustable threshold voltage or a reset signal is received, the bistable trigger module can output a recovery power supply signal to control the power supply module to recover power supply, and the hardware circuit is used for recovering the power supply of the power supply module while ensuring the recovery of overcurrent protection, so that the recovery speed is increased.

Drawings

FIG. 1 is a schematic diagram of a protection circuit according to an embodiment of the application;

FIG. 2 is a schematic diagram of a bistable trigger module according to an embodiment of the application;

FIG. 3 is a schematic diagram illustrating a reset unit according to an embodiment of the application;

FIG. 4 is a schematic diagram of a latch unit according to an embodiment of the present application;

FIG. 5 is a schematic diagram of a comparing unit according to an embodiment of the application;

FIG. 6 is a second schematic diagram of a protection circuit according to an embodiment of the application;

FIG. 7 is a schematic diagram of a power supply circuit according to an embodiment of the application;

Fig. 8 is a schematic structural view of a cleaning apparatus according to an embodiment of the present application.

Reference numerals illustrate:

1: a cleaning device; 10: a power supply circuit; 100: a protection circuit; 110: a current conversion module; 120: a bistable trigger module; 121: a comparison unit; 1211: a second unidirectional conductive sub-unit; 1212: a filtering subunit; 1213: a comparison subunit; 122: a latch unit; 1221: a second switch subunit; 1222: a first unidirectional conductive sub-unit; 131: a control unit; 1311: a single chip microcomputer; 132: a reset unit; 1321: a drive subunit; 1322: a first switch subunit; 200: a module to be tested; 300: and a power supply module.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

Referring to fig. 1, fig. 1 shows one of schematic structural diagrams of a protection circuit according to an embodiment of the application, and a protection circuit 100 according to an embodiment of the application includes a current conversion module 110 and a bistable triggering module 120. The current conversion module 110 is used for connecting with the module to be tested 200 to convert the current to be tested of the module to be tested 200 into corresponding voltage to be tested; the bistable trigger module 120 is connected to the current conversion module 110, and is configured to connect to the power supply module 300, where the bistable trigger module 120 outputs a power restoration signal to control the power supply module 300 to restore power when the voltage to be measured is less than the adjustable threshold voltage or the bistable trigger module 120 receives a reset signal.

The module to be tested 200 may be any functional circuit, and for example, when the protection circuit 100 in the present embodiment is applied to a cleaning apparatus such as a sweeping robot, the module to be tested 200 may be various driving functional circuits for driving the sweeping robot to operate. The current to be measured is the running current corresponding to each driving function circuit. For example, the current conversion module 110 may be a sampling unit, such as a voltage dividing resistor, through which the current to be measured passes, so that the voltage input to the bistable trigger module 120 via the voltage dividing resistor, the resistance value of the voltage dividing resistor, and the current to be measured conform to ohm's law, and thus, by setting the variable threshold voltage in the bistable trigger module 120, which conforms to ohm's law with the variable threshold current and the resistance value of the voltage dividing resistor, the magnitudes of the current to be measured and the variable threshold current can be obtained by comparing the magnitudes of the variable threshold voltage and the voltage to be measured, so that the operating state of the power supply module 300 is further controlled by the comparison result.

Specifically, when the voltage to be measured is smaller than the adjustable threshold voltage, it indicates that the module to be measured 200 has no overcurrent fault or the overcurrent fault has been eliminated, and the bistable trigger module 120 can timely output the power restoration signal to control the power supply module 300 to restore power. On the other hand, when the protection circuit 100 controls the power supply module 300 to stop supplying power due to an overcurrent failure of the module under test 200 in the previous operation period, the bistable trigger module 120 is quickly caused to output a power restoration signal by an externally input reset signal after the failure is removed, so that the power supply module 300 restores the power supply.

It can be understood that, in the present embodiment, the bistable trigger module 120 corresponds to a memory, when the voltage to be detected is greater than or equal to the adjustable threshold voltage, the bistable trigger module 120 continuously outputs the latch signal, which corresponds to storing the latch signal, and continuously outputs the latch signal to the power supply module 300 before receiving the reset signal, so that the state that the power supply module 300 stops supplying power is maintained, and the overcurrent protection effect of the protection circuit 100 on the power supply module 300 is more stable.

In the present embodiment, the adjustable threshold voltage of the bistable trigger module 120 compared with the voltage to be tested is variable, so the protection circuit 100 can adapt to more modules 200 to be tested. Moreover, the bistable trigger module 120 can output a recovery power supply signal to control the power supply module 300 to recover power when the voltage to be detected is smaller than the adjustable threshold voltage or the reset signal is received, so that the power supply of the power supply module 300 is recovered through the hardware circuit while the recoverability of the overcurrent protection is ensured, and the recovery speed is accelerated.

In another embodiment, when the voltage to be measured is greater than or equal to the adjustable threshold voltage and the bistable trigger module does not receive the reset signal, the bistable trigger module continuously outputs the latch signal to control the power supply module to stop supplying power.

For example, when the protection circuit in the embodiment is applied to cleaning equipment such as a sweeping robot, overcurrent can be caused due to the fact that the rolling brush, the driving wheel or the side brush of the robot equipment is clamped, and the protection circuit can detect the running currents (corresponding to the currents to be detected in the embodiment) of various functional circuits of the sweeping robot, therefore, when the corresponding functional circuits have overcurrent faults, the bistable trigger structure can continuously output latch signals to control the power supply module to stop power supply, so that the sweeping robot stops working, and safe operation of the functional circuits is timely protected.

Specifically, when the voltage to be measured is greater than or equal to the adjustable threshold voltage, the module to be measured is indicated to have faults such as overload or short circuit, and the bistable trigger module outputs a latch signal to control the power supply module to stop supplying power. For example, the bistable trigger module outputs a low-level latch signal to control the disconnection between the power supply source of the power supply module and the power supply circuit, so that the load connected with the power supply module stops working, and overcurrent protection is realized.

The bistable trigger module in the embodiment continuously outputs the latch signal before the voltage to be detected is greater than or equal to the adjustable threshold voltage and receives the reset signal, so that the power supply module is controlled to stop supplying power, the power supply module is controlled to stop supplying power all the time before the voltage to be detected is greater than or equal to the adjustable threshold voltage and receives the reset signal, and the circuit is protected.

In one embodiment, the bistable trigger module 120 includes a comparison unit 121 and a latch unit 122 as shown in the schematic structure of the bistable trigger module of fig. 2. The comparison unit 121 is connected to the current conversion module 110 and is used for connecting to the power supply module 300, outputting a latch signal when the voltage to be detected is greater than or equal to the adjustable threshold voltage, and outputting a restored power supply signal when the voltage to be detected is less than the adjustable threshold voltage; the latch unit 122 is connected to the comparison unit 121 for outputting a driving signal to make the comparison unit 121 continuously output the latch signal in a case where the comparison unit 121 outputs the latch signal and the latch unit 122 does not receive the reset signal, and for stopping outputting the driving signal in a case where the comparison unit 121 outputs the restoration power supply signal or the latch unit 122 receives the reset signal.

The comparing unit 121 may be any comparator, such as an operational amplifier or a high-speed comparator with a specification parameter of RS331XF, and the present application is not particularly limited as long as the comparing function described in the present embodiment can be implemented.

It is understood that when the comparing unit 121 is a current comparator, the current comparator may also be directly connected to the module under test 200 to obtain the current under test, and obtain the comparison result by comparing with the adjustable threshold current.

The latch unit 122 operates in a similar manner to an RS flip-flop (reset-set flip-flop). Illustratively, two ends of the latch unit 122 are respectively connected to one end of the current conversion module 110 connected to the comparison unit 121 and one end of the comparison unit 121 connected to the power supply module 300, when the comparison unit 121 outputs a latch signal, the latch unit 122 receives the latch signal, and feeds back a driving signal with a voltage greater than or equal to an adjustable threshold voltage to the comparison unit 121 based on the latch signal, so that the comparison unit 121 obtains the same comparison result as when the adjustable threshold voltage is compared with the voltage to be measured when the comparison is performed between the voltage of the driving signal and the adjustable threshold voltage, and thus the comparison unit 121 always outputs the latch signal before receiving a reset signal. It will be appreciated that when the latch unit 122 receives the reset signal, the voltage of the signal output by the latch unit 122 to the comparison unit 121 changes, and at this time, the voltage of the signal output by the latch unit 122 to the comparison voltage is smaller than the adjustable threshold voltage, so that the comparison unit 121 no longer outputs the latch signal.

In this embodiment, the bistable trigger module 120 compares the voltage to be tested with the adjustable threshold voltage through the comparing unit 121 to realize the overcurrent judgment of the module to be tested 200. Meanwhile, the judgment result of the comparing unit 121 is maintained by the driving signal output by the latch unit 122, so that the comparing unit 121 continuously outputs the latch signal to keep the power supply module 300 in a power supply stop state, and the power supply safety is protected.

In one embodiment, the protection circuit of the application further comprises a reset module, wherein the reset module is connected with the comparison unit and the latch unit and is used for connecting the module to be tested, detecting whether the module to be tested has an overcurrent fault or not when the comparison unit outputs the latch signal, and outputting a reset signal when the module to be tested does not have the overcurrent fault.

The reset module comprises a control unit and a reset unit, wherein the control unit is connected with the comparison unit and is used for connecting the module to be tested, detecting whether the module to be tested has an overcurrent fault or not when the comparison unit outputs a latch signal, and outputting a control signal when the module to be tested does not have the overcurrent fault; the reset unit is connected with the control unit and the latch unit, and outputs a reset signal to stop the latch unit from outputting the driving signal when the control unit outputs the control signal.

The control unit can be a microcontroller such as a singlechip, and can realize fault monitoring of the module to be tested, so as to further output a control signal according to a monitoring result to control whether a reset signal is output or not. The control unit is also connected with at least one fault detection module, and the number of the fault detection modules is at least one, and the fault detection modules are respectively connected with a circuit or a structure which is easy to generate an overcurrent fault in the module to be detected and are used for monitoring the overcurrent fault condition of the module to be detected in real time; when all the monitoring signals fed back to the control unit by the fault detection modules indicate that no overcurrent faults exist, the control unit starts to output control signals.

The control unit includes at least one monitoring circuit, and the detection circuit is connected with a circuit which is easy to generate an overcurrent fault in the module to be tested, so that the overcurrent monitoring of the module to be tested is realized according to the specific characteristics of the signal input by the monitoring circuit. If the signal voltage input by the monitoring line is in the first preset voltage range, the existence of the overcurrent fault is indicated, and if the signal voltage input by the monitoring line is in the second preset voltage range, the existence of the overcurrent fault is indicated.

It will be appreciated that the particular characteristics of the signal input by the monitoring line may be varied as long as it reflects the presence and absence of an over-current fault.

In this embodiment, the power supply state of the power supply module can be recovered by the reset signal output by the reset module in the hardware circuit, so that the recovery speed is increased.

In one embodiment, as shown in the schematic structure of the reset unit in fig. 3, the reset unit 132 includes a driving sub-unit 1321 and a first switching sub-unit 1322, and the driving sub-unit 1321 is connected to the control unit 131 and is used for converting the control signal into the reset signal when the control unit 131 outputs the control signal. The first switching sub-unit 1322 is connected to the driving sub-unit 1321, the latch unit 122, and the ground GND, and is configured to, when the driving sub-unit 1321 outputs the reset signal, turn on the connection between the ground GND and the latch unit 122 to stop the latch unit 122 from outputting the drive signal.

Illustratively, the drive sub-unit 1321 may be a component for providing the target voltage, such as a resistor. The first switch subunit 1322 may be a component, such as a MOS transistor, capable of being turned on under a preset condition. The first switch sub-unit 1322 is connected to the ground GND, and since the first switch sub-unit 1322 is further connected to the latch unit 122, when the first switch sub-unit 1322 is turned on when receiving the reset signal, the latch unit 122 is also turned on to the ground GND, so that the signal input to the comparing unit 121 is pulled down, that is, the latch unit 122 stops outputting the driving signal at this time.

In this embodiment, the control signal output by the control unit 131 can be converted into the reset signal for controlling the first switch sub-unit 1322 to be turned on by the driving sub-unit 1321, and then the first switch sub-unit 1322 is connected to the ground GND and the latch unit 122, so that when the first switch sub-unit 1322 is turned on, the latch unit 122 is also connected to the ground GND, and further the latch unit 122 stops outputting the driving signal, and the cut-off comparing unit 121 continuously outputs the state of the latch signal.

In one embodiment, as shown in the schematic structure of the latch unit in fig. 4, the latch unit 122 includes a second switch subunit 1221 and a first unidirectional conductive subunit 1222. The second switch subunit 1221 is connected to the output end of the comparing unit 121, and is configured to be in a conducting state when the comparing unit 121 outputs the latch signal, and convert the latch signal into a conducting signal; the first unidirectional conduction subunit 1222 includes a conduction end and a cut-off end, the conduction end of the first unidirectional conduction subunit 1222 is connected to the second switch subunit 1221, and the cut-off end of the first unidirectional conduction subunit 1222 is connected to the input end of the comparison unit 121, so that when the second switch subunit 1221 outputs the conduction signal, and before the first unidirectional conduction subunit 1222 receives the reset signal, the conduction signal is used as a driving signal to make the comparison unit 121 continuously output the latch signal.

The second switching subunit 1221 may be a component capable of being turned on or off under any preset condition, such as a transistor, where the type of the transistor is related to the connection between the comparing unit 121 and the current converting module 110 when the second switching subunit 1221 is a transistor. For example, when the comparing unit 121 is a high-speed comparator and the current converting module 110 is connected to the inverting input terminal of the high-speed comparator, the non-inverting input terminal of the high-speed comparator is connected to the adjustable threshold voltage, and when the voltage to be measured is greater than or equal to the adjustable threshold voltage, the output terminal of the high-speed comparator outputs a low-level signal, and when the latch unit 122 is required to output a driving signal, the transistor is a PNP transistor that is turned on under the control of the low-level signal. On the contrary, when the non-inverting input end of the high-speed comparator is connected with the current conversion module 110 and the inverting input end of the high-speed comparator is connected with the adjustable threshold voltage, the output end of the high-speed comparator outputs a high-level signal when the voltage to be measured is greater than or equal to the adjustable threshold voltage, and at this time, the triode is of NPN type.

The first unidirectional conducting subunit 1222 may be a diode, and it is understood that when the first unidirectional conducting subunit 1222 is a diode, the anode of the diode is a conducting terminal, and the cathode of the diode is a blocking terminal.

In the present embodiment, the second switching sub-unit 1221 is capable of turning on the connection between the output terminal of the comparing unit 121 and the end of the comparing unit 121 connected to the current converting module 110 when the comparing unit 121 outputs the latch signal, so that the comparing unit 121 continuously outputs the latch signal. The first unidirectional conduction subunit 1222 can prevent current from flowing backward to the module to be tested 200 through the current conversion module 110, so as to protect the circuit.

In one embodiment, as shown in the schematic structure of the comparing unit in fig. 5, the comparing unit 121 includes a second unidirectional conduction subunit 1211, a filtering subunit 1212, and a comparing subunit 1213. The second unidirectional conduction subunit 1211 includes a conduction end and a cutoff end, and the conduction end of the second unidirectional conduction subunit 1211 is connected to the current conversion module 110; the filter subunit 1212 is connected to the off-terminal of the second unidirectional-on subunit 1211; the comparing subunit 1213 is connected to the filtering subunit 1212, and is configured to connect to the power supply module 300, and continuously output a latch signal to control the power supply module 300 to stop supplying power when the voltage to be measured is greater than or equal to the adjustable threshold voltage and before the filtering subunit 1212 receives the reset signal.

The second unidirectional conduction subunit 1211, similar to the first unidirectional conduction subunit in the above embodiment, may be any component that performs unidirectional conduction, such as a diode; the filtering subunit 1212 may be a filtering circuit formed by a capacitor and a resistor, and is used for filtering a signal. The comparison subunit 1213 may be any comparator.

In the present embodiment, the second unidirectional conductive sub-unit 1211 can prevent current from flowing backward to the module under test 200, thereby protecting the circuit from being safe. The comparison efficiency and accuracy of the comparison subunit 1213 can be improved by filtering the signal by the filtering subunit 1212.

In one embodiment, as shown in the second schematic diagram of the protection circuit shown in fig. 6, the protection circuit 100 includes a current conversion module 110, a bistable trigger module 120, a singlechip 1311, and a reset unit 132. Wherein the current conversion module 110 includes a resistor R1; the bistable trigger module 120 comprises a diode D1, a diode D2, a resistor R2-resistor R7, a capacitor C1-capacitor C4 and a PNP triode Q1, wherein the diode D1 and the diode D2 comprise a combination of two input ends and one output end, the two input ends are respectively the anodes of the diode D1 and the diode D2, and the cathodes of the diode D1 and the diode D2 are used as the output ends to be connected with the reverse input end of the high-speed comparator U1; capacitor C2 and capacitor C3 serve as power supplies to power high-speed comparator U1. The reset unit 132 includes a resistor R8, a resistor R9, a capacitor C5, and a MOS transistor Q2. In particular, the connection relationship between the devices can be seen in fig. 6.

It can be appreciated that the diode D1 corresponds to the first unidirectional conduction subunit in the above embodiment; the diode D2 corresponds to the second unidirectional conduction subunit in the above embodiment; the filter circuit composed of the capacitor C1 and the resistor R2 is equivalent to the filter subunit in the above embodiment; the high-speed comparator U1 corresponds to the comparing subunit in the above embodiment; PNP transistor Q1 corresponds to the second switching subunit of the above embodiment; the MOS transistor Q2 corresponds to the first switch subunit in the above embodiment; the resistor R8 corresponds to the driving subunit in the above embodiment; the single chip microcomputer 1311 corresponds to the control unit in the above embodiment.

Referring to fig. 7, fig. 7 is a schematic structural diagram of a power supply circuit according to an embodiment of the present application, where the power supply circuit 10 in this embodiment includes the protection circuit 100, the module to be tested 200, and the power supply module 300 in any of the above embodiments, and the module to be tested 200 is connected to the current conversion module 110 of the protection circuit 100 and is used for outputting a current to be tested; the power supply module 300 is connected to the bistable trigger module 120 of the protection circuit 100, and is configured to stop power supply when the bistable trigger module 120 outputs a latch signal.

Referring to fig. 8, fig. 8 is a schematic diagram showing the structure of a cleaning apparatus according to an embodiment of the present application, and the cleaning apparatus 1 includes the protection circuit 100 according to any of the above embodiments.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (10)

1. A protection circuit, characterized in that the protection circuit comprises:

The current conversion module is used for connecting with the module to be tested so as to convert the current to be tested of the module to be tested into corresponding voltage to be tested;

And the bistable trigger module is connected with the current conversion module and used for being connected with the power supply module, and outputting a power restoration signal to control the power supply module to restore power supply under the condition that the voltage to be detected is smaller than the adjustable threshold voltage or the bistable trigger module receives a reset signal.

2. The protection circuit of claim 1, wherein,

The bistable trigger module is further configured to continuously output a latch signal to control the power supply module to stop supplying power when the voltage to be detected is greater than or equal to the adjustable threshold voltage and the bistable trigger module does not receive the reset signal.

3. The protection circuit of claim 2, wherein the bistable trigger module comprises:

The comparison unit is connected with the current conversion module and is used for connecting the power supply module, outputting a latch signal when the voltage to be detected is greater than or equal to the adjustable threshold voltage, and outputting a recovery power supply signal when the voltage to be detected is less than the adjustable threshold voltage;

and the latch unit is connected with the comparison unit and is used for outputting a driving signal to enable the comparison unit to continuously output the latch signal when the comparison unit outputs the latch signal and the latch unit does not receive the reset signal, and stopping outputting the driving signal when the comparison unit outputs the recovery power supply signal or the latch unit receives the reset signal.

4. A protection circuit according to claim 3, further comprising:

And the reset module is connected with the comparison unit and the latch unit and is used for connecting the module to be tested, detecting whether the module to be tested has an overcurrent fault or not when the comparison unit outputs a latch signal, and outputting a reset signal when the module to be tested does not have the overcurrent fault.

5. The protection circuit of claim 4, wherein the reset module comprises:

The control unit is connected with the comparison unit and is used for connecting the module to be tested, detecting whether the module to be tested has an overcurrent fault or not when the comparison unit outputs a latch signal, and outputting a control signal when the module to be tested does not have the overcurrent fault;

And the reset unit is connected with the control unit and the latch unit and is used for outputting a reset signal to enable the latch unit to stop outputting the driving signal when the control unit outputs the control signal.

6. The protection circuit according to claim 5, wherein the reset unit includes:

the driving subunit is connected with the control unit and used for converting the control signal into a reset signal when the control unit outputs the control signal;

And the first switch subunit is connected with the driving subunit, the latch unit and the grounding end and is used for conducting connection between the grounding end and the latch unit when the driving subunit outputs a reset signal so as to enable the latch unit to stop outputting the driving signal.

7. A protection circuit according to claim 3, wherein the latch unit comprises:

The second switch subunit is connected with the output end of the comparison unit and is used for being in a conducting state when the comparison unit outputs the latch signal and converting the latch signal into a conducting signal;

The first unidirectional conduction subunit comprises a conduction end and a cut-off end, the conduction end of the first unidirectional conduction subunit is connected with the second switch subunit, the cut-off end of the first unidirectional conduction subunit is connected with the input end of the comparison unit, and the first unidirectional conduction subunit is used for taking the conduction signal as a driving signal to enable the comparison unit to continuously output a latch signal before the second switch subunit outputs the conduction signal and the first unidirectional conduction subunit receives the reset signal.

8. A protection circuit according to claim 3, wherein the comparison unit comprises:

The second unidirectional conduction subunit comprises a conduction end and a cut-off end, and the conduction end of the second unidirectional conduction subunit is connected with the current conversion module;

The filtering subunit is connected with the cut-off end of the second unidirectional conduction subunit;

And the comparison subunit is connected with the filtering subunit and is used for connecting the power supply module, and continuously outputting a latch signal to control the power supply module to stop supplying power when the voltage to be detected is greater than or equal to the adjustable threshold voltage and before the filtering subunit receives the reset signal.

9. A power supply circuit, comprising:

a protection circuit as claimed in any one of claims 1 to 8;

the module to be tested is connected with the current conversion module of the protection circuit and is used for outputting current to be tested;

and the power supply module is connected with the bistable trigger module of the protection circuit and used for stopping power supply when the bistable trigger module outputs a latch signal.

10. A cleaning apparatus, comprising:

A protection circuit as claimed in any one of claims 1 to 8.