CN216056332U - Anti-reverse connection circuit and charger - Google Patents
Anti-reverse connection circuit and charger Download PDFInfo
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- CN216056332U CN216056332U CN202121803012.XU CN202121803012U CN216056332U CN 216056332 U CN216056332 U CN 216056332U CN 202121803012 U CN202121803012 U CN 202121803012U CN 216056332 U CN216056332 U CN 216056332U
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Abstract
The application provides an anti-reverse connection circuit and a charger, wherein the anti-reverse connection circuit is connected with a power circuit and a charging output port, and the charging output port is used for outputting a power signal of the power circuit to an external load; the reverse connection preventing circuit includes: detection circuit, judgement circuit and switching circuit. The judging circuit judges whether the charging output port is reversely connected or not according to the positive and negative polarities of the charging output port detected by the detecting circuit, and then the switching circuit is timely disconnected when the charging output port is reversely connected so as to disconnect the power supply circuit from the charging output port, thereby ensuring the power utilization safety of the equipment.
Description
Technical Field
The application relates to the field of power safety, in particular to an anti-reverse connection circuit and a charger.
Background
The conventional charger is easy to have the condition of reverse connection of a positive electrode and a negative electrode, and when the positive electrode and the negative electrode are reversely connected, once a loop is formed in equipment, irreversible damage can be caused to each device in the equipment.
SUMMERY OF THE UTILITY MODEL
The application mainly aims to provide an anti-reverse connection circuit and a charger, and aims to solve the problem that equipment is damaged due to reverse connection of the charger in the prior art.
To achieve the above object, the present application provides an anti-reverse connection circuit,
the reverse connection preventing circuit is connected with the power circuit and the charging output port, and the charging output port is used for outputting a power signal of the power circuit to an external load; the reverse connection prevention circuit includes: a detection circuit, a judgment circuit and a switch circuit; wherein:
the detection circuit is connected between a first terminal of the charging output port and a second terminal of the charging output port and is connected with the judgment circuit, and the detection circuit is used for detecting the actual electric polarity of the first terminal and the second terminal and outputting a first electric signal to the judgment circuit after generating the first electric signal according to the actual electric polarity;
the judging circuit is connected with the detection circuit and the switch circuit, and is used for judging whether the charging output port is reversely connected with the external load electric polarity according to the first electric signal and outputting a second electric signal to the switch circuit according to a judgment result;
the switching circuit is connected between the charging output port and the power circuit and connected with the judging circuit, and the switching circuit is used for switching on or switching off the connection between the charging output port and the power circuit according to the second electric signal.
Optionally, the detection circuit comprises a detection unit and an isolation unit; the detection unit is respectively connected with the anode of the charging output port and the cathode of the charging output port, the output end of the detection unit is connected with the input end of the isolation unit, and the output end of the isolation unit is connected with the input end of the judgment circuit; wherein:
the detection unit is used for detecting and outputting a third electric signal to the isolation unit according to the actual electric polarities of the first terminal of the charging output port and the second terminal of the charging output port;
the isolation unit is used for outputting the first electric signal to the judgment circuit according to the third electric signal.
Optionally, the detection unit includes a first diode, a first resistor, and a second resistor; wherein:
the negative electrode of the first diode is connected with the positive electrode of the charging output port through the first resistor; the anode of the first diode is connected with the cathode of the charging output port through the second resistor, and the anode of the first diode is further connected with the input end of the isolation unit.
Optionally, the isolation unit comprises an optocoupler; wherein:
the positive electrode of the optical coupler is connected with the negative electrode of the charging output port, and the negative electrode of the optical coupler is connected with the output end of the detection unit; and the collector of the optical coupler is connected with the input end of the judging circuit, and the emitter of the optical coupler is grounded.
Optionally, the determining circuit includes a comparator, a third resistor, a fourth resistor, and a first capacitor; wherein:
the non-inverting input end of the comparator is connected with the output end of the detection circuit, and the non-inverting input end of the comparator is also connected with the first power supply through the third resistor;
the inverting input end of the comparator is connected with a second power supply;
the output end of the comparator is connected with the control end of the switch circuit through the fourth resistor;
the power supply end of the comparator is connected with the first power supply, the power supply end of the comparator is grounded through the first capacitor, and the grounding end of the comparator is grounded.
Optionally, the determining circuit further includes an electrolytic capacitor and a second diode; wherein:
the anode of the electrolytic capacitor is connected with the non-inverting input end of the comparator, the anode of the electrolytic capacitor is also connected with the anode of the second diode, and the cathode of the second diode is connected with the first power supply; and the negative electrode of the electrolytic capacitor is grounded.
Optionally, the switching circuit includes a switching tube, a relay, a third diode, a fifth resistor, and a sixth resistor; wherein:
the control end of the switch tube is connected with the cathode of the third diode, the anode of the third diode is connected with the output end of the judging circuit through the fifth resistor, and the control end of the switch tube is grounded through the sixth resistor;
the input end of the switch tube is connected with a third power supply through a coil of the relay, and the output end of the switch tube is grounded;
and a group of normally open contacts of the relay is connected between the charging output port and the power circuit.
Optionally, the reverse connection prevention circuit further comprises an indication circuit, and the indication circuit comprises a light emitting diode and a seventh resistor; wherein:
the anode of the light emitting diode is connected with the output end of the judging circuit through the seventh resistor; and the cathode of the light emitting diode is grounded.
Optionally, the reverse connection preventing circuit further includes a processing circuit, and the processing circuit includes a control chip, a fourth diode, and a fifth diode, where:
the output end of the control chip is connected with the cathode of the fourth diode, and the anode of the fourth diode is connected with the control end of the switch circuit; the output end of the control chip is also connected with the anode of the fifth diode, and the cathode of the fifth diode is connected with a third power supply.
Further, to achieve the above object, the present application also provides a charger including: the anti-reverse-connection circuit is connected between the power supply circuit and the charging output port.
The application provides a prevent reverse connection circuit and charger, prevent reverse connection circuit includes detection circuitry, judgement circuit and switch circuit. Whether the charging output port is reversely connected is judged according to the positive polarity and the negative polarity of the charging output port, and then the output of the power circuit is timely disconnected when the charging output port is reversely connected, so that the power utilization safety of equipment is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present application 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 application, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an embodiment of an anti-reverse connection circuit according to the present application;
FIG. 2 is a schematic structural diagram of another embodiment of an anti-reverse connection circuit of the present application;
fig. 3 is a circuit structure diagram of the anti-reverse connection circuit applied in the embodiment of fig. 2.
The implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) | |
| 100 | Detection circuit | R1～R7 | First to |
|
| 110 | Detection unit | D1～D5 | First to |
|
| 120 | Isolation unit | C1 | |
|
| 200 | Judgment circuit | C2 | |
|
| 300 | Switching circuit | | Switch tube | |
| 400 | Indicating circuit | U1 | Optical coupler | |
| 500 | Processing circuit | U2 | Comparator with a comparator circuit | |
| K1 | Relay with a movable contact | LED1 | Light emitting diode | |
| V+ | A first power supply | 3V3 | Third power supply | |
| VREF | Second power supply |
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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 application.
It should be noted that all directional indicators (such as up, down, left, right, front, and back) in the embodiments of the present application are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions referred to as "first", "second", etc. in this application are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
The application provides an anti-reverse connection circuit which can be applied to power supply equipment such as a charger. Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of an anti-reverse connection circuit according to the present application. In the embodiment, the reverse connection preventing circuit is connected with the power circuit and the charging output port, and the charging output port is used for outputting a power signal of the power circuit to an external load; the reverse connection preventing circuit comprises a detection circuit 100, a judgment circuit 200 and a switch circuit 300; wherein:
a detection circuit 100 connected between a first terminal of the charging output port and a second terminal of the charging output port, and connected to the determination circuit 200, the detection circuit 100 being configured to detect an actual electrical polarity of the first terminal and the second terminal, and to output a first electrical signal to the determination circuit 200 after generating the first electrical signal according to the actual electrical polarity;
the judging circuit 200 is connected with the detecting circuit 100 and the switch circuit 300, and the judging circuit 200 is used for judging whether the charging output port is reversely connected with the electric polarity of the external load according to the first electric signal and outputting a second electric signal to the switch circuit 300 according to the judgment result;
and a switching circuit 300 connected between the charging output port and the power circuit and connected to the determining circuit 200, wherein the switching circuit 300 is configured to turn on or off the connection between the charging output port and the power circuit according to the second electrical signal.
The charger comprises a power circuit and a charging output port, and the power circuit is connected with the charging output port through an anti-reverse connection circuit.
When the charging output port is connected to an external load (e.g., a battery), the detection circuit 100 detects the polarity connection of the charging output port, and sends a first electrical signal to the determination circuit 200 according to the detection result; after receiving the first electrical signal, the determining circuit 200 compares the first electrical signal with a preset reverse connection condition, and when the first electrical signal meets the preset reverse connection condition, it is determined that the positive electrode and the negative electrode of the charging output port are reversely connected, and when the first electrical signal does not meet the preset reverse connection condition, it is determined that the charging output port is not reversely connected; sending a second electrical signal to the switching circuit 300 according to the comparison result of whether the charging output port is reversely connected; when receiving the second electrical signal indicating that the charging output port is reversely connected, the switch circuit 300 disconnects the charging output port from the power circuit, and when receiving the second electrical signal indicating that the charging output port is not reversely connected, the switch circuit 300 switches on the connection of the charging output port and the power circuit.
According to the embodiment, whether the charging output port is reversely connected is judged according to the positive polarity and the negative polarity of the charging output port, and then the power output is timely disconnected when the power circuit is reversely connected, so that the power utilization safety of equipment is ensured.
Further, referring to fig. 2, the detection circuit 100 includes a detection unit 110 and an isolation unit 120; the detection unit 110 is respectively connected with the positive electrode of the charging output port and the negative electrode of the charging output port, the output end of the detection unit 110 is connected with the input end of the isolation unit 120, and the output end of the isolation unit 120 is connected with the input end of the judgment circuit 200; wherein:
a detection unit 110 for detecting and outputting a third electrical signal to the isolation unit 120 according to the actual electrical polarities of the first terminal of the charging output port and the second terminal of the charging output port;
the isolation unit 120 is configured to output the first electrical signal to the determining circuit 200 according to the third electrical signal.
When the power circuit is connected to the charging output port, the detecting unit 110 detects the polarity connection between the power circuit and the charging output port, and sends a third electrical signal to the isolating unit 120 according to the detection result, and the isolating unit 120 sends a corresponding first electrical signal to the determining circuit 200 according to the third electrical signal.
The electrical isolation by the isolation unit 120 enables an improved immunity of the circuit.
Further, referring to fig. 3, the detection unit 110 includes a first diode D1, a first resistor R1, and a second resistor R2; wherein:
the cathode of the first diode D1 is connected with the anode of the charging output port through a first resistor R1; the anode of the first diode D1 is connected to the cathode of the charging output port through the second resistor R2, and the anode of the first diode D1 is also connected to the input terminal of the isolation unit 120.
The isolation unit 120 includes an optocoupler U1; wherein:
the positive electrode of the optocoupler U1 is connected with the negative electrode of the charging output port, and the negative electrode of the optocoupler U1 is connected with the output end of the detection unit 110; the collector of the optical coupler U1 is connected with the input end of the judgment circuit 200, and the emitter of the optical coupler U1 is grounded.
When the charging output port is not reversely connected, the first diode D1 is reversely connected in series with the anode of the charging output port, at the moment, the first diode D1 is cut off, the cathode of the optocoupler U1 is connected with the cathode of the charging output port through the second resistor R2, the voltages of the two ends of the light emitting diode LED1 in the optocoupler U1 are the same, the optocoupler U1 is cut off, and a high level signal is output to the judgment circuit 200;
when the output port that charges connects conversely, first diode D1 is positive to be established ties with the output port positive pole that charges, first diode D1 switches on this moment, the anodal of opto-coupler U1 is connected with the positive pole of battery, the negative pole of opto-coupler U1 is connected with the positive pole of battery through second resistance R2, however because the partial pressure of second resistance R2 and first resistance R1, lead to the inside emitting diode LED 1's of opto-coupler U1 anodal voltage to be greater than negative pole voltage, opto-coupler U1 switches on, output low level signal to judgement circuit 200.
Further, the determining circuit 200 includes a comparator U2, a third resistor R3, a fourth resistor R4, and a first capacitor C1; wherein:
the non-inverting input end of the comparator U2 is connected with the output end of the detection circuit 100, and the non-inverting input end of the comparator U2 is also connected with the first power supply V + through a third resistor R3;
the inverting input terminal of the comparator U2 is connected to a second power supply VREF;
the output end of the comparator U2 is connected with the control end of the switch circuit 300 through a fourth resistor R4;
the power supply terminal of the comparator U2 is connected to the first power supply V +, the power supply terminal of the comparator U2 is also connected to ground through the first capacitor C1, and the ground terminal of the comparator U2 is connected to ground.
The third resistor R3 is a pull-up resistor for clamping the non-inverting input terminal of the comparator U2 at a high level when the non-inverting input terminal of the comparator U2 does not receive a low level signal.
Optionally, in this embodiment, the voltage of the first power source V + is higher than the voltage of the second power source VREF, for example, the first power source V + is 12V, and the second power source VREF is 5V. It should be understood that the first power source V + and the second power source VREF may be voltages of other output voltages, and are not limited herein.
When the charging output port is not reversely connected, the non-inverting input end of the comparator U2 receives a voltage signal of a first power supply V +, the inverting input end of the comparator U2 receives a voltage signal of a second power supply VREF, the voltage of the non-inverting input end of the comparator U2 is greater than that of the inverting input end, and the output end of the comparator U2 outputs a high level;
when the output port is charged, the non-inverting input end of the comparator U2 is grounded, the inverting input end of the comparator U2 receives a voltage signal of a second power source VREF, the voltage of the non-inverting input end of the comparator U2 is smaller than that of the inverting input end, and the output end of the comparator U2 outputs a low level;
the first capacitor C1 is a filter capacitor.
The judgment circuit 200 further comprises an electrolytic capacitor C2 and a second diode D2; wherein:
the anode of the electrolytic capacitor C2 is connected with the non-inverting input end of the comparator U2, the anode of the electrolytic capacitor C2 is also connected with the anode of the second diode D2, and the cathode of the second diode D2 is connected with the first power supply V +; the negative electrode of the electrolytic capacitor C2 is grounded.
The electrolytic capacitor C2 plays a role of delaying conduction, and the time of delaying conduction is adjusted by adjusting the parameters of the third resistor R3 and the electrolytic capacitor C2. Specifically, when the power supply circuit is connected with the charging output port, due to the effect of the electrolytic capacitor C2, the voltage at the non-inverting input end of the comparator U2 cannot rise rapidly, so that the power supply circuit is prevented from being conducted with the charging output port when the self-checking of the power supply circuit direction is performed, and the reliability of the circuit is ensured.
The second diode D2 is used to quickly drain the charge in the electrolytic capacitor C2 when power is lost, so as to prevent the circuit function from being affected when the charge in the electrolytic capacitor C2 is not drained in time.
Further, the switch circuit 300 includes a switch tube Q1, a relay K1, a third diode D3, a fifth resistor R5, and a sixth resistor R6; wherein:
the control end of the switching tube Q1 is connected with the cathode of the third diode D3, the anode of the third diode D3 is connected with the output end of the judging circuit 200 through the fifth resistor R5, and the control end of the switching tube Q1 is also grounded through the sixth resistor R6;
the input end of the switch tube Q1 is connected with a third power supply 3V3 through a coil of a relay K1, and the output end of the switch tube Q1 is grounded;
a set of normally open contacts of relay K1 is connected between the charging output port and the power circuit.
The switching tube Q1 may be a triode or a MOS tube, and may be selected according to actual needs. In this embodiment, the switching tube Q1 is taken as a triode, the control terminal of the switching tube Q1 is the base of the triode, the input terminal of the switching tube Q1 is the collector of the triode, and the output terminal of the switching tube Q1 is the emitter of the triode.
The transistor in this embodiment is a high voltage transistor, which generates a leakage current when turned off, and the third diode D3 is used to prevent the leakage current from affecting other circuits.
The sixth resistor R6 is a pull-down resistor, and is used to clamp the base of the transistor at a low level when the base of the transistor does not receive a high level signal.
When the charging output port is not reversely connected, the base electrode of the triode receives high level, the triode is conducted, the coil of the relay K1 is electrified, the normally open contact of the relay K1 is closed, and the connection between the power circuit and the charging output port is conducted;
when the charging output port is reversely connected, the base electrode of the triode receives low level, the triode is turned off at the moment, the coil of the relay K1 is not electrified, the normally open contact of the relay K1 is disconnected, and the connection between the power circuit and the charging output port is disconnected.
The embodiment can reasonably control the connection or disconnection of the power supply circuit and the charging output port according to the connection state of the charging output port.
Further, the reverse connection prevention circuit further comprises an indicating circuit 400, wherein the indicating circuit 400 comprises a light emitting diode LED1 and a seventh resistor R7; wherein:
the anode of the light emitting diode LED1 is connected to the output end of the judging circuit 200 through a seventh resistor R7; the cathode of the light emitting diode LED1 is connected to ground.
The conduction logic of the LED1 is consistent with the conduction logic of the transistor, so that the connection state of the charging output port can be represented by the LED 1.
Specifically, when the charging output port is not reversely connected, the anode of the light emitting diode LED1 receives a high level, and the light emitting diode LED1 is turned on; specifically, when the charging output port is reversely connected, the anode of the light emitting diode LED1 receives a low level, and the light emitting diode LED1 is turned off and extinguished.
The present embodiment enables the user to know the connection state of the charging output port in real time through the light emission state of the light emitting diode LED 1.
Further, the reverse connection prevention circuit further comprises a processing circuit 500, and the processing circuit 500 comprises a control chip, a fourth diode D4 and a fifth diode D5, wherein:
the output end of the control chip is connected with the cathode of the fourth diode D4, and the anode of the fourth diode D4 is connected with the control end of the switch circuit 300; the output end of the control chip is also connected with the anode of a fifth diode D5, and the cathode of a fifth diode D5 is connected with a third power supply 3V 3.
The control chip is used for controlling the power supply circuit to be disconnected with the charging output port when other circuit faults occur or a power-off signal sent by a user is received;
when the control chip outputs low level through the fourth diode D4, the base of the triode is low level, the coil of the triode turn-off relay K1 is not electrified, the normally open contact of the relay K1 is disconnected, and the connection between the power circuit and the charging output port is disconnected.
The fifth diode D5 is used to clamp the output terminal of the control chip to prevent the maximum operating voltage of the control chip from being exceeded when the back-end circuit is abnormal, thereby damaging the control chip.
The present embodiment can provide a control method of additional power circuit connection.
The application also protects a charger, the charger includes: the structure of the reverse connection preventing circuit can refer to the above embodiments and is not described herein again. It should be noted that, since the charger of the present embodiment adopts the technical solution of the anti-reverse connection circuit, the charger has all the beneficial effects of the anti-reverse connection circuit.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. The term "comprising", without further limitation, means that the element so defined is not excluded from the group of processes, methods, articles, or systems that include the element. The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; the modifications or substitutions do not cause the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application, or to be directly or indirectly applied to other related technical fields, and are intended to be included within the scope of the present application.
Claims (10)
1. The reverse connection preventing circuit is characterized in that the reverse connection preventing circuit is connected with a power circuit and a charging output port, and the charging output port is used for outputting a power signal of the power circuit to an external load; the reverse connection prevention circuit includes: a detection circuit, a judgment circuit and a switch circuit; wherein:
the detection circuit is connected between a first terminal of the charging output port and a second terminal of the charging output port and is connected with the judgment circuit, and the detection circuit is used for detecting the actual electric polarity of the first terminal and the second terminal and outputting a first electric signal to the judgment circuit after generating the first electric signal according to the actual electric polarity;
the judging circuit is connected with the detection circuit and the switch circuit, and is used for judging whether the charging output port is reversely connected with the external load electric polarity according to the first electric signal and outputting a second electric signal to the switch circuit according to a judgment result;
the switching circuit is connected between the charging output port and the power circuit and connected with the judging circuit, and the switching circuit is used for switching on or switching off the connection between the charging output port and the power circuit according to the second electric signal.
2. The reverse-connection prevention circuit according to claim 1, wherein the detection circuit includes a detection unit and an isolation unit; the detection unit is respectively connected with the anode of the charging output port and the cathode of the charging output port, the output end of the detection unit is connected with the input end of the isolation unit, and the output end of the isolation unit is connected with the input end of the judgment circuit; wherein:
the detection unit is used for detecting and outputting a third electric signal to the isolation unit according to the actual electric polarities of the first terminal of the charging output port and the second terminal of the charging output port;
the isolation unit is used for outputting the first electric signal to the judgment circuit according to the third electric signal.
3. The reverse-connection prevention circuit according to claim 2, wherein the detection unit includes a first diode, a first resistor, and a second resistor; wherein:
the negative electrode of the first diode is connected with the positive electrode of the charging output port through the first resistor; the anode of the first diode is connected with the cathode of the charging output port through the second resistor, and the anode of the first diode is further connected with the input end of the isolation unit.
4. The reverse-connection prevention circuit according to claim 2, wherein the isolation unit includes an optocoupler; wherein:
the positive electrode of the optical coupler is connected with the negative electrode of the charging output port, and the negative electrode of the optical coupler is connected with the output end of the detection unit; and the collector of the optical coupler is connected with the input end of the judging circuit, and the emitter of the optical coupler is grounded.
5. The anti-reverse connection circuit according to any one of claims 1 to 4, wherein the judgment circuit comprises a comparator, a third resistor, a fourth resistor and a first capacitor; wherein:
the non-inverting input end of the comparator is connected with the output end of the detection circuit, and the non-inverting input end of the comparator is also connected with the first power supply through the third resistor;
the inverting input end of the comparator is connected with a second power supply;
the output end of the comparator is connected with the control end of the switch circuit through the fourth resistor;
the power supply end of the comparator is connected with the first power supply, the power supply end of the comparator is grounded through the first capacitor, and the grounding end of the comparator is grounded.
6. The anti-reverse connection circuit according to claim 5, wherein the judgment circuit further comprises an electrolytic capacitor and a second diode; wherein:
the anode of the electrolytic capacitor is connected with the non-inverting input end of the comparator, the anode of the electrolytic capacitor is also connected with the anode of the second diode, and the cathode of the second diode is connected with the first power supply; and the negative electrode of the electrolytic capacitor is grounded.
7. The reverse connection prevention circuit according to any one of claims 1 to 4, wherein the switching circuit comprises a switching tube, a relay, a third diode, a fifth resistor and a sixth resistor; wherein:
the control end of the switch tube is connected with the cathode of the third diode, the anode of the third diode is connected with the output end of the judging circuit through the fifth resistor, and the control end of the switch tube is grounded through the sixth resistor;
the input end of the switch tube is connected with a third power supply through a coil of the relay, and the output end of the switch tube is grounded;
and a group of normally open contacts of the relay is connected between the charging output port and the power circuit.
8. The reverse connection prevention circuit according to any one of claims 1 to 4, further comprising an indication circuit, wherein the indication circuit comprises a light emitting diode and a seventh resistor; wherein:
the anode of the light emitting diode is connected with the output end of the judging circuit through the seventh resistor; and the cathode of the light emitting diode is grounded.
9. The anti-reverse connection circuit according to any one of claims 1 to 4, further comprising a processing circuit including a control chip, a fourth diode, and a fifth diode, wherein:
the output end of the control chip is connected with the cathode of the fourth diode, and the anode of the fourth diode is connected with the control end of the switch circuit; the output end of the control chip is also connected with the anode of the fifth diode, and the cathode of the fifth diode is connected with a third power supply.
10. A charger, characterized in that the charger comprises: a power supply circuit, a charging output port, and an anti-reverse connection circuit as claimed in any one of claims 1 to 9, connected between the power supply circuit and the charging output port.
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| CN202121803012.XU CN216056332U (en) | 2021-08-03 | 2021-08-03 | Anti-reverse connection circuit and charger |
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| CN202121803012.XU CN216056332U (en) | 2021-08-03 | 2021-08-03 | Anti-reverse connection circuit and charger |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116345639A (en) * | 2023-05-16 | 2023-06-27 | 深圳市高斯宝电气技术有限公司 | Automatic reverse connection preventing circuit based on operational amplifier control relay |
| CN117060531A (en) * | 2023-08-14 | 2023-11-14 | 东莞航电新能源科技有限公司 | Mutual charge prevention control circuit and lithium battery pack |
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- 2021-08-03 CN CN202121803012.XU patent/CN216056332U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116345639A (en) * | 2023-05-16 | 2023-06-27 | 深圳市高斯宝电气技术有限公司 | Automatic reverse connection preventing circuit based on operational amplifier control relay |
| CN116345639B (en) * | 2023-05-16 | 2023-10-27 | 深圳市高斯宝电气技术有限公司 | Automatic reverse connection preventing circuit based on operational amplifier control relay |
| CN117060531A (en) * | 2023-08-14 | 2023-11-14 | 东莞航电新能源科技有限公司 | Mutual charge prevention control circuit and lithium battery pack |
| CN117060531B (en) * | 2023-08-14 | 2024-03-08 | 东莞航电新能源科技有限公司 | Mutual charge prevention control circuit and lithium battery pack |
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Effective date of registration: 20230718 Address after: 518057, 1, 4, building 401, two software park, Nanshan District hi tech North Zone, Shenzhen, Guangdong, Patentee after: SHENZHEN KSTAR SCIENCE AND TECHNOLOGY Co.,Ltd. Address before: 516006 1st floor, No.1 Workshop, No.2 West Hechang 7th Road, Zhongkai high tech Zone, Huizhou City, Guangdong Province Patentee before: Guangdong Youdian New Energy Technology Co.,Ltd. |