CN216720907U - Power anti-reverse circuit based on relay - Google Patents
Power anti-reverse circuit based on relay Download PDFInfo
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- CN216720907U CN216720907U CN202122538168.6U CN202122538168U CN216720907U CN 216720907 U CN216720907 U CN 216720907U CN 202122538168 U CN202122538168 U CN 202122538168U CN 216720907 U CN216720907 U CN 216720907U
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Abstract
A power anti-reverse circuit based on a relay comprises a diode D1, a diode D2, a Low Dropout (LDO) chip, the relay, a triode, a resistor R1 and a resistor R3; the breakover end of the diode D2 is respectively connected with a power supply voltage and a No. 1 pin of the relay, the cut-off end of the diode D2 is connected with the input end of the low dropout regulator (LDO) chip, and the output end of the low dropout regulator (LDO) chip is connected with the power supply end of the MCU; the 2 nd pin and the 3 rd pin are connected respectively to the coil both ends of relay, and the 2 nd pin of relay is connected the end of cutting off of diode D1, and the 3 rd pin of relay and the collecting electrode of triode are connected respectively to diode D1's the end of conducting on, and the base of triode is connected with the one end of resistance R1 and the one end of resistance R3 respectively, and the other end of resistance R1 is connected with MCU's IO mouth, and the 4 th pin and the power supply of relay are connected. The utility model has the advantages of switching-off function, low design difficulty and good price advantage.
Description
Technical Field
The utility model relates to the technical field of relays, in particular to a power anti-reverse circuit based on a relay.
Background
Inside can connect a freewheeling diode in parallel at the both ends of coil usually in current relay for the induced electromotive force that the consumption coil produced, thereby avoid the component in the circuit to damage, however, different producers have the difference on the manufacturing process of relay, and the freewheeling diode that increases does not have unified standard in polarity, makes the relay easily lead to inside increased freewheeling diode to burn out because the direction connects wrong when connecting, perhaps leads to control circuit to damage because of heavy current strikes.
SUMMERY OF THE UTILITY MODEL
Aiming at the defects of the prior art, the utility model provides a power anti-reverse circuit based on a relay, which overcomes the defects of the prior art, has reasonable design, a turn-off function and low design difficulty, and has good price advantage.
In order to achieve the purpose, the utility model is realized by the following technical scheme:
a power anti-reverse circuit based on a relay comprises a diode D1, a diode D2, a low dropout regulator (LDO) chip U1, a relay KV1, a triode Q1, a resistor R1 and a resistor R3; the conducting end of the diode D2 is respectively connected with a power supply voltage VCC-BAT and the 1 st pin of the relay KV1, the cut-off end of the diode D2 is connected with the input end of the low dropout regulator chip U1, and the output end of the low dropout regulator chip U1 is connected with the power supply end of the MCU;
two ends of a coil of the relay KV1 are respectively connected with a 2 nd pin and a 3 rd pin, the 2 nd pin of the relay KV1 is connected with a cut-off end of a diode D1, a conducting end of the diode D1 is respectively connected with a 3 rd pin of the relay KV1 and a collector of a triode Q1, a base of the triode Q1 is respectively connected with one end of a resistor R1 and one end of the resistor R3, an emitter of the triode Q1 and the other end of the resistor R3 are both grounded, the other end of the resistor R1 is connected with an I/O port of an MCU, a 1 st pin of the relay KV1 is respectively connected with a 4 th pin and a 5 th pin of the relay KV1 through a change-over switch, and a 4 th pin of the relay KV1 is connected with a power supply.
Preferably, the 2 nd pin of the relay KV1 and the cut-off end of the diode D2 are respectively connected with a signal power supply.
Preferably, the ground terminal GND of the low dropout LDO chip U1 is grounded.
The utility model provides a power anti-reverse circuit based on a relay. The method has the following beneficial effects: the reverse connection signal power supply is cut off through the diode D2 so as to control a switch in the pull-in relay KV1, the MCU is effectively controlled, and the reliability of the circuit is improved.
Drawings
In order to more clearly illustrate the present invention or the prior art solutions, the drawings that are needed in the description of the prior art will be briefly described below.
FIG. 1 is a schematic structural view of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings.
As shown in fig. 1, a relay-based power anti-reverse circuit includes a diode D1, a diode D2, a low dropout LDO chip U1, a relay KV1, a transistor Q1, a resistor R1, and a resistor R3; the conducting end of the diode D2 is respectively connected with a power supply voltage VCC-BAT and the 1 st pin of the relay KV1, the cut-off end of the diode D2 is connected with the input end of the low dropout regulator chip U1, and the output end of the low dropout regulator chip U1 is connected with the power supply end of the MCU; the grounding end GND of the low dropout regulator (LDO) chip U1 is grounded;
two ends of a coil of the relay KV1 are respectively connected with a 2 nd pin and a 3 rd pin, the 2 nd pin of the relay KV1 is connected with a cut-off end of a diode D1, a conducting end of a diode D1 is respectively connected with a 3 rd pin of the relay KV1 and a collector of a triode Q1, a base of the triode Q1 is respectively connected with one end of a resistor R1 and one end of a resistor R3, an emitter of the triode Q1 and the other end of the resistor R3 are both grounded, the other end of the resistor R1 is connected with an I/O port of the MCU, a 1 st pin of the relay KV1 is respectively connected with a 4 th pin and a 5 th pin of the relay KV1 through a change-over switch, and a 4 th pin of the relay KV1 is connected with a power supply.
In the present embodiment, the 2 nd pin of the relay KV1 and the cut-off terminal of the diode D2 are both connected to signal power sources, respectively.
The working principle is as follows:
when the power supply is normally connected, the power supply voltage VCC-BAT is connected to the low dropout regulator (LDO) chip U1 through the diode D2, the low dropout regulator (LDO) chip U1 works normally, and the MCU works normally when the normal working voltage is supplied to the power supply end of the MCU; the power supply end of the MCU supplies high level to an I/O port of the MCU to enable the triode Q1 to be conducted, the 1 st pin contact of the relay KV1 is switched to the 4 th pin from the 5 th pin, and the power supply is conducted.
When the power supply is reversely connected, the diode D2 cuts off a reverse connection signal power supply, the low dropout LDO chip U1 does not work, the MCU does not work, the relay KV1 is controlled by the MCU and does not work, and when the relay KV1 is disconnected, the power supply is not conducted, so that the reverse voltage is cut off.
This application cuts off reverse signal power through diode D2 to the switch in the control actuation relay KV1 realizes the effective control to the relay, has improved the circuit reliability greatly.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will 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; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (3)
1. A power anti-reverse circuit based on a relay is characterized in that: the low dropout regulator comprises a diode D1, a diode D2, a low dropout regulator (LDO) chip U1, a relay KV1, a triode Q1, a resistor R1 and a resistor R3; the conducting end of the diode D2 is respectively connected with a power supply voltage VCC-BAT and the 1 st pin of the relay KV1, the cut-off end of the diode D2 is connected with the input end of the low dropout regulator chip U1, and the output end of the low dropout regulator chip U1 is connected with the power supply end of the MCU;
two ends of a coil of the relay KV1 are respectively connected with a 2 nd pin and a 3 rd pin, the 2 nd pin of the relay KV1 is connected with a cut-off end of a diode D1, a conducting end of the diode D1 is respectively connected with a 3 rd pin of the relay KV1 and a collector of a triode Q1, a base of the triode Q1 is respectively connected with one end of a resistor R1 and one end of the resistor R3, an emitter of the triode Q1 and the other end of the resistor R3 are both grounded, the other end of the resistor R1 is connected with an I/O port of an MCU, a 1 st pin of the relay KV1 is respectively connected with a 4 th pin and a 5 th pin of the relay KV1 through a change-over switch, and a 4 th pin of the relay KV1 is connected with a power supply.
2. The relay-based power anti-reverse circuit according to claim 1, wherein: and the No. 2 pin of the relay KV1 and the cut-off end of the diode D2 are respectively connected with a signal power supply.
3. The relay-based power anti-reverse circuit according to claim 1, wherein: the ground terminal GND of the low dropout LDO chip U1 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122538168.6U CN216720907U (en) | 2021-10-21 | 2021-10-21 | Power anti-reverse circuit based on relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122538168.6U CN216720907U (en) | 2021-10-21 | 2021-10-21 | Power anti-reverse circuit based on relay |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216720907U true CN216720907U (en) | 2022-06-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122538168.6U Active CN216720907U (en) | 2021-10-21 | 2021-10-21 | Power anti-reverse circuit based on relay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216720907U (en) |
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2021
- 2021-10-21 CN CN202122538168.6U patent/CN216720907U/en active Active
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