CN217956682U - Protective circuit - Google Patents
Protective circuit Download PDFInfo
- Publication number
- CN217956682U CN217956682U CN202221422152.7U CN202221422152U CN217956682U CN 217956682 U CN217956682 U CN 217956682U CN 202221422152 U CN202221422152 U CN 202221422152U CN 217956682 U CN217956682 U CN 217956682U
- Authority
- CN
- China
- Prior art keywords
- resistor
- capacitor
- protection circuit
- chip microcomputer
- single chip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model relates to a protection circuit, which comprises a singlechip, a first resistor, a second resistor, a third resistor, an over-temperature protection circuit and a switch control circuit; the single chip microcomputer is respectively connected with the over-temperature protection circuit and the switch control circuit, and the output end of the single chip microcomputer is connected with an external module power supply; the over-temperature protection circuit is used for adjusting input voltage according to the current circuit temperature so as to enable the output end of the single chip microcomputer to output a control signal to control an external module power supply; the switch control circuit is used for comparing the set switch level range with the sampling voltage so as to enable the output end of the single chip microcomputer to output a control signal to control an external module power supply. The utility model discloses use singlechip and peripheral circuit jointly for the singlechip can the integrated function, realizes input voltage overvoltage protection, input voltage undervoltage protection, excess temperature protection, on-off control's function and the technical problem that the totality component is many, the circuit is complicated among the solution prior art simultaneously.
Description
Technical Field
The utility model relates to an electronic circuit field especially relates to a protection circuit.
Background
In the prior art, a conventional module power protection circuit usually detects a sampling voltage by using an operational amplifier as a control main body of the protection circuit, and switches a module power supply by comparing the sampling voltage with a reference voltage to obtain a high level and a low level, for example, an input over-voltage and under-voltage protection circuit is disclosed in chinese patent publication No. CN107449959A, and an input over-voltage and under-voltage protection circuit designed based on the operational amplifier compares the input voltage with the reference voltage to obtain the high level and the low level. However, because of the hardware characteristics of the operational amplifier, only one operational amplifier can be designed to implement one function, when the protection circuit needs to simultaneously implement the functions of over-voltage and under-voltage protection, over-temperature protection and switch control of the input voltage, a plurality of operational amplifiers are required to be combined for design and use, and such a protection circuit needs a plurality of elements, has a complex circuit structure, and is not easy to expand other functions.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a protection circuit solves among the prior art and uses the fortune to put the ware and realize input voltage overvoltage protection, input voltage undervoltage protection, excess temperature protection, on-off control's function simultaneously and use the technical problem that the component is many, the circuit is complicated as the control main part.
The utility model provides a protection circuit, include: the over-temperature protection circuit comprises a singlechip, a first resistor, a second resistor, a third resistor, an over-temperature protection circuit and a switch control circuit; the first end of the first resistor is connected with an external switching power supply, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is grounded, the first end of the third resistor is connected between the first resistor and the second resistor, and the second end of the third resistor is connected with the single chip microcomputer; the single chip microcomputer is respectively connected with the over-temperature protection circuit and the switch control circuit, and the output end of the single chip microcomputer is connected with an external module power supply; the over-temperature protection circuit is used for adjusting input voltage according to the current circuit temperature so that the output end of the single chip microcomputer outputs a control signal to control an external module power supply; the switch control circuit is used for comparing the set switch level range with the sampling voltage so as to enable the output end of the single chip microcomputer to output a control signal to control an external module power supply.
Optionally, the over-temperature protection circuit includes: the first end of the fourth resistor is connected with an external chip power supply, the second end of the fourth resistor is connected with the first end of the first thermistor, the second end of the first thermistor is grounded, the first end of the fifth resistor is connected between the fourth resistor and the first thermistor, and the second end of the fifth resistor is connected with the single chip microcomputer.
Optionally, the switch control circuit comprises: the potential control end, the first diode, the first electric capacity, the negative pole of the first diode and the first end of the first electric capacity are connected, its connecting node is connected with potential control end, the second end of the first electric capacity is earthed, the positive pole of the first diode is connected with the one-chip computer.
Optionally, the protection circuit further comprises: the first charging module comprises a second capacitor and a third capacitor, the first end of the second capacitor is connected with the second end of the first resistor and is connected with the second resistor in parallel, the second end of the second capacitor is grounded, the first end of the third capacitor is connected with the second end of the third resistor, and the second end of the third capacitor is grounded.
Optionally, the over-temperature protection circuit further includes: and the first end of the fourth capacitor is interconnected with the second end of the fourth resistor, the first end of the first thermistor and the first end of the fifth resistor, and the second end of the fourth capacitor is grounded.
Optionally, the switch control circuit further comprises: and the third charging module comprises a fifth capacitor and a sixth resistor, the first end of the sixth resistor is connected with an external chip power supply, the second end of the sixth resistor is connected with the anode of the first diode, the connecting node of the sixth resistor is connected with the singlechip, the first end of the fifth capacitor is connected with the connecting node of the anode of the first diode and the second end of the sixth resistor, and the second end of the fifth capacitor is grounded.
Optionally, the protection circuit further comprises: and the fourth charging module comprises a seventh resistor, a sixth capacitor and a seventh capacitor, the first end of the seventh resistor is connected with an external chip power supply, the second end of the seventh resistor is connected with the first end of the sixth capacitor, a connecting node of the seventh resistor is connected with the single chip microcomputer, the second end of the sixth capacitor is grounded, the first end of the seventh capacitor is connected with the external chip power supply, and the second end of the seventh capacitor is connected with the single chip microcomputer and grounded.
Implement the embodiment of the utility model provides a, will have following beneficial effect:
the single chip microcomputer is used as a main body of the protection circuit, a peripheral circuit is constructed, the single chip microcomputer can integrate functions, and overvoltage and undervoltage protection, over-temperature protection and remote switch control functions of input voltage are achieved through fewer devices. When the input voltage is too high or too low, the sampling voltage obtained by the single chip microcomputer is too high or too low, and the single chip microcomputer outputs a shutdown signal; when the temperature is too high, the input voltage is reduced, the sampling voltage obtained by the single chip microcomputer is reduced, and the single chip microcomputer outputs a shutdown signal; when the sampling voltage is lower than the set shutdown level range, the singlechip outputs a shutdown signal. The utility model discloses a setting uses the singlechip to connect overtemperature prote circuit, on-off control circuit as the control main part, and singlechip output switch signal is with the module power that the protection is connected, and the device of using is few, uses the fortune to put the ware and realize the overvoltage and undervoltage protection of input voltage, overtemperature prote, remote switch control's function and use the technical problem that the component is many, the circuit is complicated simultaneously as the control main part among the protection circuit among the solution prior art.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a circuit diagram of a protection circuit according to an embodiment of the present invention.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Hereinafter, the term "includes" or "may include" used in various embodiments of the present disclosure indicates the presence of the disclosed functions, operations, or elements, and does not limit the addition of one or more functions, operations, or elements.
Expressions (such as "first", "second", and the like) used in various embodiments of the present disclosure may modify various constituent elements in various embodiments, but may not limit the respective constituent elements. For example, the above description does not limit the order and/or importance of the elements described. The foregoing description is for the purpose of distinguishing one element from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of various embodiments of the present disclosure.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In order to solve and realize input voltage overvoltage protection, input voltage undervoltage protection, excess temperature protection, on-off control's function and use the technical problem that the component is many, the circuit is complicated simultaneously as the control main part with the fortune ware of putting among the prior art, the utility model provides an use protection circuit of singlechip as basis.
In one embodiment, as shown in fig. 1, the protection circuit includes: the over-temperature protection circuit comprises a singlechip S1, a first resistor R1, a second resistor R2, a third resistor R3, an over-temperature protection circuit 10 and a switch control circuit 20; a first end of the first resistor R1 is connected with an external switching power supply VIN, a second end of the first resistor R1 is connected with a first end of the second resistor R2, a second end of the second resistor R2 is grounded, a first end of the third resistor R3 is connected between the first resistor R1 and the second resistor R2, and a second end of the third resistor R3 is connected with the singlechip S1; the single chip microcomputer S1 is respectively connected with the over-temperature protection circuit 10 and the switch control circuit 20, and the output end of the single chip microcomputer S1 is connected with an external module power supply OFF; the over-temperature protection circuit 10 is used for adjusting input voltage according to the current circuit temperature so that the output end of the singlechip S1 outputs a control signal to control an external module power supply to be OFF; the switch control circuit 20 is used for comparing the set switch level range with the sampling voltage, so that the output end of the singlechip S1 outputs a control signal to control the OFF of an external module power supply.
The singlechip S1 selected in the embodiment is a small 8-pin singlechip with the model of PIC16F18313-E/RF and is packaged into UDFN-8. The sampled voltage refers to the magnitude of the voltage input to the corresponding pin. The input voltage is input to a corresponding pin of the singlechip S1 to realize ADC conversion. The second pin RA5 of the single chip microcomputer S1 is connected to an external module power supply OFF, the second pin RA5 outputs a high-low level signal, i.e., a power-on/OFF signal (control signal), and the external module power supply OFF receives the power-on signal or the power-OFF signal to perform corresponding power-on/OFF. The switching power supply VIN provides input voltage, and the chip power supply VCC provides 5V voltage of the power supply of the singlechip S1. The first pin VDD is a power supply pin of the singlechip S1, and the eighth pin VSS is a grounding pin of the singlechip S1.
The first resistor R1 and the second resistor R2 are used for dividing an input voltage provided by the switching power supply VIN, and since a voltage of each pin of the single chip microcomputer S1 generally cannot exceed a voltage provided by the chip power supply VCC, and the input voltage may be greater than the voltage provided by the chip power supply VCC, the divided voltage needs to be set in order to protect the single chip microcomputer S1. The third resistor R3 is used for limiting current and preventing overlarge input current from breaking down the singlechip S1. The input voltage of switching power supply VIN passes through first resistance R1 and second resistance R2 partial pressure, the voltage after the partial pressure passes through third resistance R3 and inputs singlechip S1 'S seventh pin RA0, the ADC conversion is realized to seventh pin RA0, read input voltage, when input voltage is too high or low, singlechip S1' S second pin RA5 output shutdown signal, the module power OFF of connection acquires shutdown signal and closes, thereby realize the input voltage overvoltage protection to the module power OFF of connection, undervoltage protection.
The over-temperature protection circuit 10 is used for realizing over-temperature protection, the chip power supply VCC is connected with the over-temperature protection circuit 10, and the over-temperature protection circuit 10 is connected with a fifth pin RA2 of the single chip microcomputer S1. When the temperature of the protection circuit rises, the input voltage of a fifth pin RA2 of the single chip microcomputer S1 is reduced, when the temperature reaches a set threshold value, the second pin RA5 outputs a shutdown signal, the module power supply OFF connected with the second pin RA5 obtains the shutdown signal and is closed, the effect that the module power supply OFF obtains the shutdown signal when the temperature of the circuit rises is achieved, and the module power supply OFF is closed in time, so that the module power supply OFF is not damaged by over-temperature.
The switch control circuit 20 is configured to compare the set switch level range with the sampling voltage, so that the single chip microcomputer S1 outputs a corresponding control signal, thereby implementing the on/OFF of the module power supply OFF. When the sampling voltage of the third pin RA4 of the single chip microcomputer S1 is lower than the set level range, the second pin RA5 of the single chip microcomputer S1 outputs a shutdown signal, and when the sampling voltage of the third pin RA4 of the single chip microcomputer S1 is higher than the set level range, the second pin RA5 of the single chip microcomputer S1 outputs a startup signal.
It should be noted that, the utility model discloses well relevant numerical value can be revised according to actual need to more do benefit to protect function to further extension. For example, the range of switching levels in the switch control circuit 20 may be modified in combination with the actual requirements of the circuit.
The single chip microcomputer is used as a main body of the protection circuit, a peripheral circuit is constructed, the single chip microcomputer can integrate functions, and overvoltage and undervoltage protection, over-temperature protection and remote switch control functions of input voltage are achieved through fewer devices. When the input voltage is too high or too low, the sampling voltage obtained by the single chip microcomputer is too high or too low, and the single chip microcomputer outputs a shutdown signal; when the temperature is too high, the input voltage is reduced, the sampling voltage obtained by the singlechip is reduced, and the singlechip outputs a shutdown signal; when the sampling voltage is lower than the set shutdown level range, the singlechip outputs a shutdown signal. The utility model discloses a setting uses the singlechip to connect overtemperature prote circuit, on-off control circuit as the control main part, and singlechip output switch signal is with the module power that the protection is connected, and the device of using is few, uses the fortune to put the ware and realize the overvoltage and undervoltage protection of input voltage, overtemperature prote, remote switch control's function and use the technical problem that the component is many, the circuit is complicated simultaneously as the control main part among the protection circuit among the solution prior art. Compared with the protection circuit using an operational amplifier, the circuit device used by the protection circuit is less, and the circuit principle is simple and easy to realize.
In one embodiment, as shown in fig. 1, the over-temperature protection circuit 10 includes: fourth resistance R4, fifth resistance R5, first thermistor RT1, fourth resistance R4 'S first end is connected with outside chip power VCC, and fourth resistance R4' S second end and first thermistor RT1 'S first end are connected, and first thermistor RT 1' S second end ground connection, and fourth resistance R4 and first thermistor RT1 are connected to fifth resistance R5 'S first end, and singlechip S1 is connected to fifth resistance R5' S second end.
The thermistor can sense the ambient temperature and its resistance value can be changed according to the ambient temperature. The fourth resistor R4 is used for limiting current, the fourth resistor R4 and the first thermistor RT1 divide voltage between the chip power VCC and the ground, the divided voltage is input to the fifth lead RA2 of the single chip microcomputer S1 through the fourth resistor R4, and the fifth lead RA2 of the single chip microcomputer S1 realizes ADC conversion to read the voltage. When the temperature rises, the resistance value of the first thermistor RT1 is reduced, so that the input voltage of a fifth pin RA2 of the singlechip S1 is reduced, and the sampling voltage of the fifth pin RA2 of the singlechip S1 is reduced; when the temperature rises to the threshold value, a second pin RA5 of the singlechip S1 outputs a shutdown protection signal.
In one embodiment, as shown in fig. 1, the switch control circuit 20 includes: the LED driving circuit comprises a potential control end ON/OFF, a first diode D1 and a first capacitor C1, wherein the cathode of the first diode D1 is connected with the first end of the first capacitor C1, the connecting node of the first diode D1 is connected with the potential control end ON/OFF, the second end of the first capacitor C1 is grounded, and the anode of the first diode D1 is connected with a singlechip S1.
The ON/OFF of the potential control terminal is a switch control pin, which is a pin for inputting direct current voltage, a user can control the ON/OFF of the switch according to the pin, and the level setting of the pin can be high level ON and low level OFF, or high level OFF and low level ON, and the setting is performed according to actual needs. A first diode D1 and a first capacitor C1 are connected in series between a chip power supply VCC and the ground, a potential control end ON/OFF is connected between the first diode D1 and the first capacitor C1 externally, a user sets a power-ON/power-OFF level range independently through the potential control end ON/OFF, the power-OFF level range of the potential control end ON/OFF is set to be 0-U1, and the power-ON level range is set to be U2-4.3V (U2 is more than U1). The input voltage of the potential control terminal ON/OFF is smaller than the voltage provided by the chip power supply VCC, the first diode D1 is conducted by the voltage provided by the chip power supply VCC, and because the voltage drop of the first diode D1 is fixed, when the input voltage of the potential control terminal ON/OFF changes, the sampling voltage of the third pin RA4 of the singlechip S1 also changes. It can be understood that, in the present embodiment, the input voltage is provided by the ON/OFF of the voltage control terminal, and is input to the third pin RA4 of the single chip microcomputer S1, and the third pin RA4 of the single chip microcomputer S1 obtains the sampling voltage. When the sampling voltage of a third pin RA4 of the singlechip S1 is lower than U1, a second pin RA5 of the singlechip S1 outputs a shutdown signal; when the sampling voltage of the third pin RA4 of the single chip microcomputer S1 is higher than that of the U2, the second pin RA5 of the single chip microcomputer S1 outputs a starting signal, and therefore the independent switch control over the OFF of the module power supply is achieved. And because the unidirectional conductivity of the first diode D1, when the input voltage of the ON/OFF of the potential control end is higher than the voltage provided by the chip power supply VCC, the first diode D1 is cut OFF, and the highest voltage of the pin of the singlechip S1 is the voltage provided by the chip power supply VCC, so that the singlechip S1 cannot be damaged.
In one embodiment, as shown in fig. 1, the protection circuit further includes: the first charging module comprises a second capacitor C2 and a third capacitor C3, the first end of the second capacitor C2 is connected with the second end of the first resistor R1 and is connected with the second resistor R2 in parallel, the second end of the second capacitor C2 is grounded, the first end of the third capacitor C3 is connected with the second end of the third resistor R3, and the second end of the third capacitor C3 is grounded.
The working of the singlechip needs a minimum system, corresponding burning pins are needed during the burning program of the singlechip, and the pins all need voltage capable of keeping normal working, so the lowest voltage is needed to keep the singlechip S1 to work, a chip power supply VCC charges a second capacitor C2 and a third capacitor C3 through a resistor, and the second capacitor C2 and the third capacitor C3 are charged fully to a seventh pin RA0 of the connected singlechip S1 so as to keep the voltage of the seventh pin RA0 of the singlechip S1.
In one embodiment, as shown in fig. 1, the over-temperature protection circuit 10 further includes: and the second charging module comprises a fourth capacitor C4, the first end of the fourth capacitor C4, the second end of the fourth resistor R4, the first end of the first thermistor RT1 and the first end of the fifth resistor R5 are interconnected, and the second end of the fourth capacitor C4 is grounded.
The working of the single chip microcomputer needs a minimum system, corresponding burning pins are needed during the burning program of the single chip microcomputer, the pins all need to be kept at a voltage for normal working, the minimum voltage is needed to keep the single chip microcomputer S1 working, a chip power supply VCC charges a fourth capacitor C4, and the fourth capacitor C4 is fully charged and then charges a fifth pin RA2 of the connected single chip microcomputer S1 so as to keep the voltage needed by the fifth pin RA2.
In one embodiment, as shown in fig. 1, the switch control circuit 20 further includes: the third module of charging, the third module of charging includes fifth electric capacity C5, sixth resistance R6, the first end and the chip power VCC of sixth resistance R6 are connected, the second end of sixth resistance R6 and the positive pole of first diode D1 are connected, its connected node is the third end of switch control circuit 20, the first end of fifth electric capacity C5 is connected at the connected node of the positive pole of first diode D1 and the second end of sixth resistance R6, the second end ground connection of fifth electric capacity C5.
The working of the singlechip requires a minimum system, corresponding burning pins are required during the burning program of the singlechip, the pins all need to be kept at a normal working voltage, so that the lowest voltage is required to keep the singlechip S1 working, a chip power supply VCC charges a fifth capacitor C5, and the fifth capacitor C5 is fully charged and then charges a third pin RA4 of the connected singlechip S1 to keep the voltage required by the third pin RA 4. The sixth resistor R6 is used for limiting current and determining the charging current and the charging speed of the fifth capacitor C5.
In one embodiment, as shown in fig. 1, the protection circuit further includes: the fourth charging module comprises a seventh resistor R7, a sixth capacitor C6 and a seventh capacitor C7, the first end of the seventh resistor R7 is connected with the chip power supply VCC, the second end of the seventh resistor R7 is connected with the first end of the sixth capacitor C6, the connecting node is connected with the single chip microcomputer S1, the second end of the sixth capacitor C6 is grounded, the first end of the seventh capacitor C7 is connected with the external chip power supply VCC, and the second end of the seventh capacitor C7 is connected with the single chip microcomputer S1 and grounded.
The working of the singlechip requires a minimum system, corresponding burning pins are required during the burning program of the singlechip and need to be kept at a normal working voltage, so that the lowest voltage is required to keep the singlechip S1 working, a chip power supply VCC charges a sixth capacitor C6 and a seventh capacitor C7, and the sixth capacitor C6 and the seventh capacitor C7 are charged fully and respectively charge a fourth pin RA3 of the singlechip S1 and an eighth pin VSS of the singlechip S1 which are connected with the sixth capacitor C6 and the seventh capacitor C7 so as to keep the voltages of the fourth pin RA3 of the singlechip S1 and the eighth pin VSS of the singlechip S1. The seventh resistor R7 is used for limiting current and determining the charging current and the charging speed of the sixth capacitor C6.
The working principle of the invention is explained below with reference to fig. 1:
when the switching power supply VIN provides an input voltage, the input voltage is input to the corresponding pin S1 of the single chip microcomputer to obtain a sampling voltage. When the sampling voltage accords with a normal range, a power-on signal output by a second pin RA5 of the singlechip S1 enables an OFF of a connected module power supply to keep working normally, and when the sampling voltage is too large or too small, a power-OFF signal output by the second pin RA5 of the singlechip S1 enables the OFF of the module power supply to be closed; when the temperature of the circuit rises to a set threshold value, the over-temperature protection circuit 10 reduces the input voltage, the sampling voltage obtained by a fifth pin RA2 of the singlechip S1 is reduced, and a shutdown signal output by a second pin RA5 of the singlechip S1 enables the power supply of the module to be OFF; when a power-ON/OFF level range is set at an ON/OFF potential control end in the switch control circuit 20, and a sampling voltage RA4 obtained by a fourth pin RA3 of the single chip microcomputer S1 is lower than the set power-OFF level range, a power-OFF signal output by a second pin RA5 of the single chip microcomputer S1 turns OFF a module power supply.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (7)
1. A protection circuit, characterized in that the protection circuit comprises: the over-temperature protection circuit comprises a singlechip, a first resistor, a second resistor, a third resistor, an over-temperature protection circuit and a switch control circuit; the first end of the first resistor is connected with an external switching power supply, the second end of the first resistor is connected with the first end of the second resistor, the second end of the second resistor is grounded, the first end of the third resistor is connected between the first resistor and the second resistor, and the second end of the third resistor is connected with the single chip microcomputer; the single chip microcomputer is respectively connected with the over-temperature protection circuit and the switch control circuit, and the output end of the single chip microcomputer is connected with an external module power supply; the over-temperature protection circuit is used for adjusting input voltage according to the current circuit temperature so that the output end of the single chip microcomputer outputs a control signal to control an external module power supply; the switch control circuit is used for comparing the set switch level range with the sampling voltage so as to enable the output end of the single chip microcomputer to output a control signal to control an external module power supply.
2. The protection circuit of claim 1, wherein the over-temperature protection circuit comprises: the chip comprises a fourth resistor, a fifth resistor and a first thermistor, wherein the first end of the fourth resistor is connected with an external chip power supply, the second end of the fourth resistor is connected with the first end of the first thermistor, the second end of the first thermistor is grounded, the first end of the fifth resistor is connected between the fourth resistor and the first thermistor, and the second end of the fifth resistor is connected with the single chip microcomputer.
3. The protection circuit according to claim 1, wherein the switch control circuit comprises: the voltage regulator comprises a potential control end, a first diode and a first capacitor, wherein the cathode of the first diode is connected with the first end of the first capacitor, a connecting node of the first diode is connected with the potential control end, the second end of the first capacitor is grounded, and the anode of the first diode is connected with the singlechip.
4. The protection circuit of claim 2, further comprising: the first module of charging, first module of charging includes second electric capacity, third electric capacity, the first end of second electric capacity is connected the second end of first resistance, with second resistance is parallelly connected, the second end ground connection of second electric capacity, the first end of third electric capacity with the second end of third resistance is connected, the second end ground connection of third electric capacity.
5. The protection circuit of claim 2, wherein the over-temperature protection circuit further comprises: the second charging module comprises a fourth capacitor, the first end of the fourth capacitor is interconnected with the second end of the fourth resistor, the first end of the first thermistor and the first end of the fifth resistor, and the second end of the fourth capacitor is grounded.
6. The protection circuit of claim 3, wherein the switch control circuit further comprises: the third charging module comprises a fifth capacitor and a sixth resistor, the first end of the sixth resistor is connected with an external chip power supply, the second end of the sixth resistor is connected with the anode of the first diode, the connecting node of the sixth resistor is connected with the single chip microcomputer, the first end of the fifth capacitor is connected with the connecting node of the anode of the first diode and the second end of the sixth resistor, and the second end of the fifth capacitor is grounded.
7. The protection circuit of claim 4, further comprising: the first end of the seventh resistor is connected with an external chip power supply, the second end of the seventh resistor is connected with the first end of the sixth capacitor, a connecting node of the seventh resistor is connected with the single chip microcomputer, the second end of the sixth capacitor is grounded, the first end of the seventh capacitor is connected with the external chip power supply, and the second end of the seventh capacitor is connected with the single chip microcomputer and grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221422152.7U CN217956682U (en) | 2022-06-08 | 2022-06-08 | Protective circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221422152.7U CN217956682U (en) | 2022-06-08 | 2022-06-08 | Protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217956682U true CN217956682U (en) | 2022-12-02 |
Family
ID=84215536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221422152.7U Active CN217956682U (en) | 2022-06-08 | 2022-06-08 | Protective circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217956682U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116885669A (en) * | 2023-09-08 | 2023-10-13 | 广东东菱电源科技有限公司 | MCU (micro control unit) controlled input voltage overvoltage and undervoltage protection circuit |
-
2022
- 2022-06-08 CN CN202221422152.7U patent/CN217956682U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116885669A (en) * | 2023-09-08 | 2023-10-13 | 广东东菱电源科技有限公司 | MCU (micro control unit) controlled input voltage overvoltage and undervoltage protection circuit |
| CN116885669B (en) * | 2023-09-08 | 2024-01-12 | 广东东菱电源科技有限公司 | MCU (micro control unit) controlled input voltage overvoltage and undervoltage protection circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN217956682U (en) | Protective circuit | |
| US20200083725A1 (en) | Hibernate mode for battery pack protection circuitry | |
| US20140292257A1 (en) | Electronic device and charging circuit thereof | |
| JP6778142B2 (en) | Electronic devices and their power circuits | |
| CN112311038A (en) | Charging and discharging protection circuit, terminal equipment and battery discharging control method | |
| CN112670959A (en) | Lithium battery protection circuit | |
| CN217115613U (en) | Undervoltage protection circuit | |
| CN104795003A (en) | LED electronic name tag with USB interface and realizing method thereof | |
| CN208270993U (en) | Electrifying startup circuit for Loongson processor | |
| US9231432B2 (en) | Electronic device and charging circuit thereof | |
| US20200026676A1 (en) | Usb expansion function device | |
| CN208423857U (en) | A kind of novel lithium battery switched charge power supply protection circuit | |
| CN106655406B (en) | Single-port charging device | |
| CN216774740U (en) | Reset circuit | |
| CN216851930U (en) | Starting circuit and electronic equipment | |
| CN114243870B (en) | Over-discharge protection circuit, battery protection board and electronic equipment | |
| CN215580343U (en) | Standby zero-power-consumption undervoltage protection system and electric appliance | |
| CN211630157U (en) | Touch power switch suitable for small-sized battery power supply electronic equipment | |
| CN103376749A (en) | Startup and shutdown circuit and electronic equipment | |
| CN220066900U (en) | Battery boost circuit | |
| CN117293991B (en) | Solar charging control circuit with protection function | |
| CN219145258U (en) | Undervoltage detection circuit and switching power supply | |
| CN111431149B (en) | Battery protection circuit, terminal and battery protection method | |
| CN218888388U (en) | Power supply circuit with surge current protection function and wireless communication equipment | |
| CN117526080B (en) | Laser and control protection circuit thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |