CN113972628A - Overcurrent detection protection circuit and electronic equipment - Google Patents
Overcurrent detection protection circuit and electronic equipment Download PDFInfo
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- CN113972628A CN113972628A CN202111259888.7A CN202111259888A CN113972628A CN 113972628 A CN113972628 A CN 113972628A CN 202111259888 A CN202111259888 A CN 202111259888A CN 113972628 A CN113972628 A CN 113972628A
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- 238000001514 detection method Methods 0.000 title claims abstract description 39
- 238000007599 discharging Methods 0.000 claims abstract description 46
- 238000012545 processing Methods 0.000 claims abstract description 38
- 239000003990 capacitor Substances 0.000 claims description 43
- 238000012423 maintenance Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 8
- 238000013461 design Methods 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/027—Details with automatic disconnection after a predetermined time
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
- H02H7/1252—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to overvoltage in input or output, e.g. by load dump
Abstract
The embodiment of the application provides an overcurrent protection detection circuit and electronic equipment, wherein a rectifying voltage-dividing circuit receives a load current and then carries out rectifying voltage-dividing processing on the load current to obtain a load processing voltage, the load processing voltage is input to a control circuit, when the control circuit detects that the load processing voltage exceeds a preset voltage, a high-level signal is output to a driver to enable the driver to drive the load to stop running, a charging and discharging circuit carries out charging until a preset charging threshold value is reached under the condition that the load stops running, and the control circuit continuously sends the high-level signal to the driver when the charging and discharging circuit is charged; and when the charging reaches a preset charging threshold value, discharging until the preset discharging threshold value is reached, and outputting a low level signal to the driver by the control circuit so as to enable the driver to drive the load to start running. This application can make control circuit continuously send high level signal to the driver when charge-discharge circuit charges, and control circuit sends low level signal to the driver when the completion of discharging, and it is long when guaranteeing the maintenance, effectively reduces the potential safety hazard.
Description
Technical Field
The invention relates to the technical field of circuit detection and protection, in particular to an overcurrent detection protection circuit and electronic equipment.
Background
In power conversion and motor speed regulation, the driver has the advantages of both photoelectric isolation and electromagnetic isolation, and the design of the bootstrap power supply greatly simplifies the design of the driving power supply, so the driver is widely applied to power driving. The driver is provided with a turn-off pin port which can be used for overcurrent and overvoltage protection, when abnormal conditions occur, the turn-off pin port is changed from a low level to a high level, the high level output by the driver enables the converter to stop working, and the safety of a system is protected.
However, after the driver detects that the overcurrent is eliminated, the port of the turn-off pin is instantly changed from a high level to a low level, and the output waveform of the driver can be restored, so that the converter immediately enters a working state, potential safety hazards exist, and the use of the converter is not facilitated for users.
Disclosure of Invention
In view of the above, an object of the present invention is to provide an overcurrent detection protection circuit and an electronic device, which can maintain a load to stop operating for a period of time after detecting that an overcurrent signal disappears, thereby effectively reducing potential safety hazards.
In a first aspect, an embodiment of the present invention provides an overcurrent detection protection circuit, where the overcurrent detection protection circuit includes: the control circuit is also connected with the charging and discharging circuit; the rectification voltage division circuit is used for being connected with a load, receiving load current input by the load, performing rectification voltage division on the load current, and inputting load processing voltage subjected to rectification voltage division to the control circuit; the control circuit is also used for being connected with a driver for controlling the load to run, receiving the load processing voltage, and outputting a high-level signal to the driver to enable the driver to drive the load to stop running if the load processing voltage is detected to exceed a preset voltage; the charging and discharging circuit is used for charging until a preset charging threshold value is reached under the condition that the load stops running so that the control circuit can continuously send a high-level signal to the driver when the charging and discharging circuit is charged; and when the charging reaches a preset charging threshold value, discharging until the preset discharging threshold value is reached, and outputting a low level signal to the driver by the control circuit so as to enable the driver to drive the load to start running.
The rectification voltage division circuit comprises a rectification circuit and a voltage division circuit, wherein the rectification circuit is connected with the control circuit and the charging and discharging circuit through the voltage division circuit; the rectifying circuit is used for being connected with a load, receiving load current, rectifying the load current and inputting the rectified load current to the voltage dividing circuit; and the voltage division circuit receives the rectified load current, performs voltage division processing on the rectified load current to obtain load processing voltage, and inputs the load processing voltage into the control circuit.
The rectifying circuit is a rectifying bridge circuit consisting of a first rectifying diode, a second rectifying diode, a third rectifying diode and a fourth rectifying diode; the anode of the first rectifier diode and the cathode of the second rectifier diode are connected with one end of a load, the anode of the third rectifier diode and the cathode of the fourth rectifier diode are connected with the other end of the load, the cathode of the first rectifier diode and the cathode of the third rectifier diode are connected with a voltage division circuit, and the anode of the second rectifier diode and the anode of the fourth rectifier diode are grounded.
The voltage division circuit comprises a first resistor, a second resistor, a third resistor and a first capacitor; the negative pole of the first rectifier diode and the negative pole of the third rectifier diode are connected with one end of the first resistor, one end of the second resistor, one end of the third resistor and one end of the first capacitor are connected with the other end of the first resistor, the other end of the second resistor and the other end of the first capacitor are grounded, and the other end of the third resistor is connected with the control circuit and the charging and discharging circuit.
The control circuit comprises a reference power supply chip, a first triode, a fourth resistor, a fifth resistor, a second capacitor, a voltage power supply, a sixth resistor, a first diode, a seventh resistor and a third capacitor; the control electrode of the reference power supply chip is connected with the other end of the third resistor, the cathode of the reference power supply chip is connected with the base electrode of the first triode through the fourth resistor, the cathode of the reference power supply chip is connected with the emitting electrode of the first triode through the fifth resistor, the anode of the reference power supply chip is grounded, the collecting electrode of the first triode is connected with the driver, one ends of the fifth resistor and the second capacitor are connected with the voltage power supply, the other end of the second capacitor is grounded, one end of the sixth resistor is connected with the collecting electrode of the first triode, the other end of the sixth resistor is connected to the control electrode through the first diode, one end of the seventh resistor and one end of the third capacitor are connected to the control electrode, and the other end of the seventh resistor and the other end of the third capacitor are grounded.
The charging and discharging circuit comprises an eighth resistor, a second diode, a voltage regulator tube, a second triode, a fourth capacitor and a ninth resistor; one end of the eighth resistor, the negative electrode of the second diode and one end of the ninth resistor are connected with the collector electrode of the first triode, the other end of the eighth resistor, the positive electrode of the second diode and one end of the fourth capacitor are connected with the negative electrode of the voltage regulator tube, the other end of the fourth capacitor is grounded, the positive electrode of the voltage regulator tube is connected with the base electrode of the second triode, the emitting electrode of the second triode is grounded, the collector electrode of the second triode is connected with the other end of the third resistor and the control electrode, and the other end of the ninth resistor is grounded.
The first triode is a PNP triode.
The second triode is an NPN triode.
The overcurrent detection protection circuit is arranged on the PCB.
In a second aspect, an embodiment of the present invention further provides an electronic device, where the electronic device includes the over-current detection protection circuit.
The embodiment of the invention has the following beneficial effects:
the embodiment of the application provides an overcurrent protection detection circuit and electronic equipment, wherein the rectification voltage division circuit performs rectification voltage division processing on load current after receiving the load current to obtain load processing voltage, the load processing voltage is input to the control circuit, the control circuit outputs a high-level signal to a driver when detecting that the load processing voltage exceeds preset voltage, so that the driver drives the load to stop running, and a charging and discharging circuit performs charging until reaching a preset charging threshold value under the condition that the load stops running, so that the control circuit continuously sends the high-level signal to the driver when the charging and discharging circuit is charged; and when the charging reaches a preset charging threshold value, discharging until the preset discharging threshold value is reached, and outputting a low level signal to the driver by the control circuit so as to enable the driver to drive the load to start running. This application can utilize charge and discharge circuit's charge and discharge characteristic to make control circuit continuously send high level signal to the driver during charging to make load stop operation, when the completion of discharging, control circuit sends low level signal to the driver, so that the load begins to operate, and it is long when guaranteeing the maintenance, effectively reduces the potential safety hazard, thereby has ensured user's safe handling.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of an overcurrent detection protection circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another over-current detection protection circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of an over-current detection protection circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Considering that the existing driver can instantly change the port of the turn-off pin from a high level to a low level after detecting that the overcurrent is eliminated, the output waveform of the driver can be restored, so that the converter immediately enters a working state, potential safety hazards can exist, and the use of a user is not facilitated; based on this, the over-current detection protection circuit and the electronic device provided by the embodiments of the present invention can utilize the charge and discharge characteristics of the charge and discharge circuit to enable the control circuit to continuously send a high level signal to the driver during the charge period, so as to stop the operation of the load, and when the discharge is completed, the control circuit sends a low level signal to the driver, so as to start the operation of the load, thereby ensuring the maintenance duration, effectively reducing the potential safety hazard, and ensuring the safe use of the user.
The embodiment provides an over-current detection protection circuit, wherein, referring to a schematic structural diagram of the over-current detection protection circuit shown in fig. 1, as shown in fig. 1, the over-current detection protection circuit includes: the charging and discharging circuit comprises a rectification voltage division circuit 100, a control circuit 101 and a charging and discharging circuit 102, wherein the control circuit 101 is connected with the rectification voltage division circuit 100, and the charging and discharging circuit 102 is also connected with the control circuit 101; the rectification voltage division circuit is used for being connected with a load, receiving load current input by the load, performing rectification voltage division on the load current, and inputting load processing voltage subjected to rectification voltage division to the control circuit; the control circuit is also used for being connected with a driver for controlling the load to run, receiving the load processing voltage, and outputting a high-level signal to the driver to enable the driver to drive the load to stop running if the load processing voltage is detected to exceed a preset voltage; the charging and discharging circuit is used for charging until a preset charging threshold value is reached under the condition that the load stops running so that the control circuit can continuously send a high-level signal to the driver when the charging and discharging circuit is charged; and when the charging reaches a preset charging threshold value, discharging until the preset discharging threshold value is reached, and outputting a low level signal to the driver by the control circuit so as to enable the driver to drive the load to start running.
When the load is in overcurrent, the load processing voltage output by the rectifying voltage division circuit is increased, so that the load processing voltage reaches the preset voltage of the control circuit, at the moment, the control circuit sends a high level signal to the driver to enable the driver to drive the load to stop working, when the load stops working, the load processing voltage output by the rectifying voltage division circuit is 0, the charging and discharging circuit starts to charge until the charged electric quantity reaches the preset charging threshold value, during the period, the control circuit is maintained to always send the high level signal to the driver, when the charging and discharging circuit finishes charging and starts discharging, and until the discharged electric quantity reaches the preset discharging threshold value, the control circuit sends a low level signal to the driver to enable the driver to drive the load to start running, so that the maintenance time is prolonged, the occurrence of faults can be greatly reduced, and the safe use of users is guaranteed.
The preset voltage, the preset charging threshold and the preset discharging threshold may be determined according to values of components of the overcurrent protection detection circuit, and are not limited herein.
The embodiment of the application provides an overcurrent protection detection circuit, wherein a rectification voltage division circuit performs rectification voltage division processing on a load current after receiving the load current to obtain a load processing voltage, the load processing voltage is input to a control circuit, the control circuit outputs a high level signal to a driver when detecting that the load processing voltage exceeds a preset voltage, so that the driver drives the load to stop running, and a charge and discharge circuit performs charging until reaching a preset charging threshold value under the condition that the load stops running, so that the control circuit continuously sends the high level signal to the driver when the charge and discharge circuit is charged; and when the charging reaches a preset charging threshold value, discharging until the preset discharging threshold value is reached, and outputting a low level signal to the driver by the control circuit so as to enable the driver to drive the load to start running. This application can utilize charge and discharge circuit's charge and discharge characteristic to make control circuit continuously send high level signal to the driver during charging to make load stop operation, when the completion of discharging, control circuit sends low level signal to the driver, so that the load begins to operate, and it is long when guaranteeing the maintenance, effectively reduces the potential safety hazard, thereby has ensured user's safe handling.
On the basis of fig. 1, fig. 2 shows a schematic structural diagram of another over-current detection protection circuit, as shown in fig. 2, the rectifying and voltage-dividing circuit 100 includes a rectifying circuit 200 and a voltage-dividing circuit 201, wherein the rectifying circuit 200 is connected with the control circuit 101 and the charging and discharging circuit 102 through the voltage-dividing circuit 201; the rectifying circuit is used for being connected with a load, receiving load current, rectifying the load current and inputting the rectified load current to the voltage dividing circuit; and the voltage division circuit receives the rectified load current, performs voltage division processing on the rectified load current to obtain load processing voltage, and inputs the load processing voltage into the control circuit.
In this embodiment, the rectifying circuit rectifies the ac current into a dc voltage, and the voltage is divided by the voltage divider circuit to obtain the load processing voltage.
For ease of understanding, fig. 3 shows a circuit diagram of an overcurrent detection protection circuit, and as shown in fig. 3, the rectifier circuit is a rectifier bridge circuit composed of a first rectifier diode D1, a second rectifier diode D2, a third rectifier diode D3, and a fourth rectifier diode D4; the anode of the first rectifier diode D1 and the cathode of the second rectifier diode D2 are connected to one end of the load F, the anode of the third rectifier diode and the cathode of the fourth rectifier diode D4 are connected to the other end of the load, the cathode of the first rectifier diode D1 and the cathode of the third rectifier diode D3 are connected to the voltage divider circuit, and the anode of the second rectifier diode D2 and the anode of the fourth rectifier diode D4 are grounded to GND.
As shown in fig. 3, the voltage divider circuit includes a first resistor R2, a second resistor R3, a third resistor D4, and a first capacitor C1; the negative electrode of the first rectifier diode D1 and the negative electrode of the third rectifier diode D3 are connected with one end of a first resistor R2, one end of a second resistor R3, one end of a third resistor R4 and one end of a first capacitor C1 are connected with the other end of a first resistor R2, the other end of the second resistor R3 and the other end of the first capacitor C1 are both grounded to GND, and the other end of the third resistor R4 is connected with a control circuit and a charging and discharging circuit.
As shown in fig. 3, the control circuit includes a reference power chip IC1, a first transistor Q2, a fourth resistor R9, a fifth resistor R10, a second capacitor C4, a voltage source V, a sixth resistor R7, a first diode D6, a seventh resistor R8, and a third capacitor C3; a control electrode B of the reference power chip IC1 is connected to the other end of the third resistor R4, a cathode of the reference power chip IC1 is connected to a base of the first transistor Q2 through the fourth resistor R9, and is connected to an emitter of the first transistor Q2 through the fifth resistor R10, an anode of the reference power chip IC1 is grounded GND, a collector of the first transistor Q2 is connected to the driver D, one ends of the fifth resistor R10 and the second capacitor C4 are connected to the voltage source V, the other end of the second capacitor C4 is grounded GND, one end of the sixth resistor R7 is connected to a collector of the first transistor Q2, the other end of the sixth resistor R7 is connected to the control electrode B through the first diode D6, one end of the seventh resistor R8 and one end of the third capacitor C3 are connected to the control electrode B, and the other end of the seventh resistor R8 and the other end of the third capacitor C3 are grounded GND. Wherein, the first triode is a PNP type triode.
As shown in fig. 3, the charging and discharging circuit includes an eighth resistor R6, a second diode D5, a voltage regulator ZD1, a second transistor Q1, a fourth capacitor C2, and a ninth resistor R5; one end of an eighth resistor R6, the cathode of the second diode D5 and one end of a ninth resistor R5 are connected with the collector of the first triode Q2, the other end of the eighth resistor R6, the anode of the second diode Q1 and one end of a fourth capacitor C2 are connected with the cathode of a voltage regulator tube ZD1, the other end of the fourth capacitor C2 is grounded GND, the anode of the voltage regulator tube ZD1 is connected with the base of the second triode Q1, the emitter of the second triode Q1 is grounded GND, the collector of the second triode Q1 is connected with the other end of the third resistor R4 and the control electrode B, and the other end of the ninth resistor R5 is grounded GND. The second triode is an NPN triode.
By the circuit, when the load is in overcurrent, the load processing voltage output by the rectifying voltage division circuit exceeds the preset voltage of the control electrode B of the reference power supply chip, at the moment, the IC1 is conducted, because the anode of the IC1 is grounded, the first triode Q2 is conducted, the collector of the first triode is changed into the voltage value of the voltage power supply from low level, the driver is blocked due to a high level signal, and the load stops. Because the load stops working, the load processing voltage output by the rectifying voltage-dividing circuit is 0, and meanwhile, the voltage power supply makes the level of the control electrode B greater than the preset voltage through the sixth resistor R7, the first diode D6, the seventh resistor R8 and the third capacitor C3, so that the IC1 keeps a conducting state, at this time, the voltage power supply charges the fourth capacitor C2 through the eighth resistor R6, the level of the positive electrode of the fourth capacitor C2 slowly rises, because the resistance of the eighth resistor R6 is very large, the fourth capacitor C2 can rise to be above the preset charging threshold after a period of time, and the first triode outputs a high-level signal to the driver all the time, so that the driver blocks output.
When the charging capacity of the fourth capacitor C2 reaches a preset charging threshold value, the second triode Q1 connected with the voltage regulator tube ZD1 is turned on, the level of the control electrode B becomes 0, the reference power supply chip IC1 is turned off, the first triode Q2 is also turned off, at this time, the fourth capacitor C2 discharges through the second diode D5 and the ninth resistor R5, because the resistance value of the ninth resistor R5 is very small, the discharging speed of the fourth capacitor C2 is far greater than the charging speed, the collector electrode of the first triode outputs a low level signal to the driver quickly, the driver recovers to a normal state, and the driving blocking is released, namely the driver drives the load to operate.
In actual use, because the PCB (Printed Circuit Board) Board can electrically connect elements in the Circuit, the assembly and welding work of electronic products is simplified, the wiring workload in the traditional mode is reduced, and the labor intensity of workers is greatly reduced; and the whole volume is reduced, the product cost is reduced, the quality and the reliability of the electronic equipment are improved, and the like, so that in the embodiment, the overcurrent detection protection Circuit can be arranged on a Printed Circuit Board (PCB) for use.
The above-mentioned overcurrent detection protection circuit that this embodiment is disclosed can in time output high level signal under the load condition of overflowing, utilizes the driver to block drive signal to make the load stop operation, and after delaying a period, give the time that maintenance personal fully handled the overload problem of load, then unblock is blocked automatically, resumes normal standby state, and the fault that can significantly reduce takes place.
Corresponding to the embodiment of the over-current detection protection circuit, an embodiment of the invention provides an electronic device, fig. 4 shows a schematic structural diagram of the electronic device, and as shown in fig. 4, the electronic device 400 includes the over-current detection protection circuit 401. The electronic device may be any device that needs overcurrent detection protection, and is not limited herein.
The electronic device provided by the embodiment of the invention has the same technical characteristics as the overcurrent detection protection circuit provided by the embodiment, so that the same technical problems can be solved, and the same technical effects can be achieved.
In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that the following embodiments are merely illustrative of the present invention, and not restrictive, and the scope of the present invention is not limited thereto: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An over-current detection protection circuit, comprising: the charging and discharging circuit comprises a rectification voltage division circuit, a control circuit and a charging and discharging circuit, wherein the control circuit and the charging and discharging circuit are connected with the rectification voltage division circuit;
the rectification voltage division circuit is used for being connected with a load, receiving load current input by the load, performing rectification voltage division processing on the load current to obtain load processing voltage, and inputting the load processing voltage to the control circuit;
the control circuit is also used for being connected with a driver for controlling the load to run, receiving the load processing voltage, and outputting a high-level signal to the driver to enable the driver to drive the load to stop running if the load processing voltage is detected to exceed a preset voltage;
the charging and discharging circuit is used for charging until a preset charging threshold value is reached under the condition that the load stops running, so that the control circuit continuously sends the high-level signal to the driver when the charging and discharging circuit is charged; and when the charging reaches a preset charging threshold value, discharging until the preset discharging threshold value is reached, and outputting a low level signal to the driver by the control circuit so that the driver drives the load to start running.
2. The over-current detection protection circuit according to claim 1, wherein the rectifying voltage-dividing circuit comprises a rectifying circuit and a voltage-dividing circuit, wherein the rectifying circuit is connected with the control circuit and the charging and discharging circuit through the voltage-dividing circuit;
the rectifying circuit is used for being connected with a load, receiving the load current, rectifying the load current and inputting the rectified load current to the voltage dividing circuit;
the voltage division circuit receives the rectified load current, performs voltage division processing on the rectified load current to obtain the load processing voltage, and inputs the load processing voltage to the control circuit.
3. The overcurrent detection protection circuit according to claim 2, wherein the rectifier circuit is a rectifier bridge circuit composed of a first rectifier diode, a second rectifier diode, a third rectifier diode, and a fourth rectifier diode; the positive electrode of the first rectifier diode and the negative electrode of the second rectifier diode are connected with one end of a load, the positive electrode of the third rectifier diode and the negative electrode of the fourth rectifier diode are connected with the other end of the load, the negative electrode of the first rectifier diode and the negative electrode of the third rectifier diode are connected with the voltage division circuit, and the positive electrode of the second rectifier diode and the positive electrode of the fourth rectifier diode are grounded.
4. The over-current detection protection circuit according to claim 3, wherein the voltage divider circuit comprises a first resistor, a second resistor, a third resistor and a first capacitor;
the negative electrode of the first rectifier diode and the negative electrode of the third rectifier diode are connected with one end of the first resistor, one end of the second resistor, one end of the third resistor and one end of the first capacitor are connected with the other end of the first resistor, the other end of the second resistor and the other end of the first capacitor are grounded, and the other end of the third resistor is connected with the control circuit and the charging and discharging circuit.
5. The over-current detection protection circuit according to claim 4, wherein the control circuit comprises a reference power supply chip, a first triode, a fourth resistor, a fifth resistor, a second capacitor, a voltage power supply, a sixth resistor, a first diode, a seventh resistor and a third capacitor;
wherein the control electrode of the reference power supply chip is connected with the other end of the third resistor, the cathode of the reference power supply chip is connected with the base electrode of the first triode through the fourth resistor, the reference power supply chip is connected with the emitting electrode of the first triode through a fifth resistor, the anode of the reference power supply chip is grounded, the collector of the first triode is connected with the driver, one end of the fifth resistor and one end of the second capacitor are connected with the voltage power supply, the other end of the second capacitor is grounded, one end of the sixth resistor is connected with the collector of the first triode, the other end of the sixth resistor is connected to the control electrode through the first diode, one end of the seventh resistor and one end of the third capacitor are connected to the control electrode, and the other end of the seventh resistor and the other end of the third capacitor are grounded.
6. The over-current detection protection circuit according to claim 5, wherein the charge and discharge circuit comprises an eighth resistor, a second diode, a voltage regulator tube, a second triode, a fourth capacitor and a ninth resistor;
one end of the eighth resistor, the negative electrode of the second diode and one end of a ninth resistor are all connected with the collector electrode of the first triode, the other end of the eighth resistor, the positive electrode of the second diode and one end of a fourth capacitor are all connected with the negative electrode of the voltage regulator tube, the other end of the fourth capacitor is grounded, the positive electrode of the voltage regulator tube is connected with the base electrode of the second triode, the emitting electrode of the second triode is grounded, the collector electrode of the second triode is connected with the other end of the third resistor and the control electrode, and the other end of the ninth resistor is grounded.
7. The over-current detection protection circuit of claim 5, wherein the first transistor is a PNP type transistor.
8. The over-current detection protection circuit of claim 6, wherein the second transistor is an NPN transistor.
9. The over-current detection protection circuit according to claim 1, wherein the over-current detection protection circuit is disposed on a PCB board.
10. An electronic device, characterized in that the electronic device comprises the over-current detection protection circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111259888.7A CN113972628A (en) | 2021-10-28 | 2021-10-28 | Overcurrent detection protection circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111259888.7A CN113972628A (en) | 2021-10-28 | 2021-10-28 | Overcurrent detection protection circuit and electronic equipment |
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| CN113972628A true CN113972628A (en) | 2022-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111259888.7A Pending CN113972628A (en) | 2021-10-28 | 2021-10-28 | Overcurrent detection protection circuit and electronic equipment |
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Citations (6)
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|---|---|---|---|---|
| US6404608B1 (en) * | 1990-10-12 | 2002-06-11 | Tyco Electronics Uk Ltd. | Overcurrent protection device |
| US20070236839A1 (en) * | 2006-04-05 | 2007-10-11 | Vanruymbeke Gilles | Power supply particularly for a meter-bus |
| CN104218531A (en) * | 2014-09-04 | 2014-12-17 | 国家电网公司 | Short circuit protecting circuit and method |
| CN207853441U (en) * | 2017-12-25 | 2018-09-11 | 河北树航教育科技有限公司 | Teaching experimental equipment overload short circuit protects circuit |
| CN214100827U (en) * | 2020-12-28 | 2021-08-31 | 国家电网有限公司 | Overvoltage and overcurrent protection device for direct current power supply |
| CN214337789U (en) * | 2021-01-08 | 2021-10-01 | 雅安小航电器有限责任公司 | Direct-current low-side driving switch circuit with short circuit and overload protection functions |
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2021
- 2021-10-28 CN CN202111259888.7A patent/CN113972628A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6404608B1 (en) * | 1990-10-12 | 2002-06-11 | Tyco Electronics Uk Ltd. | Overcurrent protection device |
| US20070236839A1 (en) * | 2006-04-05 | 2007-10-11 | Vanruymbeke Gilles | Power supply particularly for a meter-bus |
| CN104218531A (en) * | 2014-09-04 | 2014-12-17 | 国家电网公司 | Short circuit protecting circuit and method |
| CN207853441U (en) * | 2017-12-25 | 2018-09-11 | 河北树航教育科技有限公司 | Teaching experimental equipment overload short circuit protects circuit |
| CN214100827U (en) * | 2020-12-28 | 2021-08-31 | 国家电网有限公司 | Overvoltage and overcurrent protection device for direct current power supply |
| CN214337789U (en) * | 2021-01-08 | 2021-10-01 | 雅安小航电器有限责任公司 | Direct-current low-side driving switch circuit with short circuit and overload protection functions |
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