CN211859581U - Relay protection circuit of charger - Google Patents
Relay protection circuit of charger Download PDFInfo
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- CN211859581U CN211859581U CN202020758763.3U CN202020758763U CN211859581U CN 211859581 U CN211859581 U CN 211859581U CN 202020758763 U CN202020758763 U CN 202020758763U CN 211859581 U CN211859581 U CN 211859581U
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- mcu
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Abstract
The utility model discloses a relay protection circuit of charger, through the closure or the disconnection that use two relays of MCU control, come the various operating condition of adjustment transformer winding, then the control point of two relays is connected by a triode, prevents that two relays are closed simultaneously, like this, if MCU inefficacy, two relays also can not be closed simultaneously, just so can not lead to transformer winding short circuit to play protection circuit's effect.
Description
Technical Field
The utility model relates to a relay protection circuit of charger.
Background
Nowadays, batteries are used more and more, the used batteries are also large and small, the batteries with different capacities are charged by different voltages and currents, the switched charging modes are too many, and if a certain part goes wrong, the winding of the low-frequency transformer can be short-circuited to cause the charger to be on fire.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a relay protection circuit of charger is provided, it can effectually avoid the charger transformer winding short circuit in the use.
In order to solve the technical problem, the utility model provides a relay protection circuit of charger, it includes transformer, first relay, second relay, triode, rectifier bridge and MCU;
the transformer comprises a first secondary winding and a second secondary winding;
the first relay comprises a first coil and a first contact, and the first contact comprises a fixed end, a first movable end and a second movable end;
the second relay comprises a second coil and a second contact, and the second contact is provided with a first terminal and a second terminal;
the rectifier bridge is provided with a first input end, a second input end, a positive output end and a negative output end;
the MCU is provided with a first port and a second port;
one end of the first secondary winding is electrically connected with a first movable end of the first relay, the other end of the first secondary winding is electrically connected with a first wiring end of the second relay, a second wiring end of the second relay is electrically connected with a first input end of the rectifier bridge, one end of the second secondary winding is electrically connected with a fixed end of the first relay, the other end of the second secondary winding is electrically connected with a first input end of the rectifier bridge, a first movable end of the first relay is electrically connected with a second input end of the rectifier bridge, and a second movable end of the first relay is electrically connected with a first wiring end of the second relay;
one end of a first coil of the first relay is respectively electrically connected with a first port of the MCU and a base electrode of the triode, the other end of the first coil of the first relay is connected with the switching power supply, a collector of the triode is electrically connected with one end of a second coil of the second relay, the other end of the second coil of the second relay is connected with the switching power supply, and an emitter of the triode is electrically connected with a second port of the MCU.
Preferably, a resistor is connected in series between the first port of the MCU and the base of the triode.
Preferably, the second coil of the second relay is connected in parallel with a diode, and the anode of the diode is connected to the connection point of the collector of the triode and the second coil of the second relay.
After the structure more than adopting, compared with the prior art, the utility model, have following advantage:
the utility model discloses use the closure or the disconnection of two relays of MCU control, adjust transformer winding's various operating condition, then the control point of two relays is connected by a triode, prevents that two relays are closed simultaneously, like this, if MCU became invalid, two relays also can not be closed simultaneously, just so can not lead to transformer winding short circuit to play protection circuit's effect.
Drawings
Fig. 1 is a schematic diagram of the circuit structure of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Shown by fig. 1, the utility model discloses relay protection circuit of charger, it includes transformer, first relay KJ2, second relay KJ5, triode Q1, rectifier bridge BD1 and MCU.
The transformer comprises a first secondary winding 1 and a second secondary winding 2.
The first relay KJ2 comprises a first coil and a first contact, the first contact comprises a fixed end 3, a first movable end 4 and a second movable end 5, the first movable end 4 is a normally closed end, and the second movable end 5 is a normally open end.
The second relay KJ5 includes a second coil and a second contact having a first terminal 6 and a second terminal 7, and the second contact is a normally open contact.
The rectifier bridge BD1 has a first input terminal 8, a second input terminal 9, a positive output terminal and a negative output terminal.
The MCU has a first port and a second port.
One end of the first secondary winding 1 is electrically connected with a first movable end 4 of a first relay KJ2, the other end of the first secondary winding 1 is electrically connected with a first terminal 6 of a second relay KJ5, a second terminal 7 of the second relay KJ5 is electrically connected with a first input end 8 of a rectifier bridge BD1, one end of the second secondary winding 2 is electrically connected with a fixed end 3 of the first relay KJ2, the other end of the second secondary winding 2 is electrically connected with a first input end 8 of a rectifier bridge BD1, a first movable end 4 of the first relay KJ2 is electrically connected with a second input end 9 of the rectifier bridge BD1, and a second movable end 5 of the first relay KJ2 is electrically connected with a first terminal 6 of a second relay KJ 5.
One end of the first coil of the first relay KJ2 is respectively connected with the first port of the MCU, the base electrode of the triode Q1 is electrically connected, the other end of the first coil of the first relay KJ2 is connected with a switching power supply, the switching power supply is a 24V direct current power supply, the collector electrode of the triode Q1 is electrically connected with one end of the second coil of the second relay KJ5, the other end of the second coil of the second relay KJ5 is connected with the switching power supply, the switching power supply is a 24V direct current power supply, and the emitter electrode of the triode Q1 is electrically connected with the second port of the MCU.
And a resistor R36 is connected in series between the first port of the MCU and the base electrode of the triode Q1.
The second coil of the second relay KJ5 is connected in parallel with a diode D13, the anode of the diode D13 is connected to the connection point of the collector of the triode Q1 and the second coil of the second relay KJ5, and the connection point of the second coil of the second relay KJ5 and the switching power supply is connected with the cathode of the diode D13.
The utility model discloses following three kinds of mode have:
1. the MCU controls the first movable end 4 of the first contact of the first relay KJ2 to be closed and the second contact of the second relay KJ5 to be opened, and at the moment, the second winding 2 of the transformer works independently;
2. the MCU controls a first movable end 4 of a first contact of the first relay KJ2 to be closed and a second contact of the second relay KJ5 to be closed, and at the moment, a first winding 1 and a second winding 2 of the transformer work in parallel;
3. the MCU controls the second movable end 5 of the first contact of the first relay KJ2 to be closed and the second contact of the second relay KJ5 to be opened, and at the moment, the first winding 1 and the second winding 2 of the transformer are connected in series to work.
If the MCU fails, when the first relay KJ2 and the second relay KJ5 are at low voltages at the same time, the transistor Q1 is not turned on, and at this time, the utility model relates to the above-mentioned 1 st operating mode; if MCU became invalid, when first relay KJ2 and second relay KJ5 were high voltage simultaneously, triode Q1 did not switch on, this moment the utility model discloses a foretell 2 nd kind of mode, the utility model discloses the second that makes first relay KJ 2's first coil moves end and second relay KJ 5's second coil does not have the closed state simultaneously, so can play protection circuit's effect when MCU became invalid.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention, but should not be construed as limiting the claims, and the present invention is not limited to the above-described embodiments, but may be modified in various ways. In summary, all changes that can be made within the scope of the independent claims of the present invention are within the scope of the present invention.
Claims (3)
1. A relay protection circuit of a charger is characterized by comprising a transformer, a first relay, a second relay, a triode, a rectifier bridge and an MCU;
the transformer comprises a first secondary winding and a second secondary winding;
the first relay comprises a first coil and a first contact, and the first contact comprises a fixed end, a first movable end and a second movable end;
the second relay comprises a second coil and a second contact, and the second contact is provided with a first terminal and a second terminal;
the rectifier bridge is provided with a first input end, a second input end, a positive output end and a negative output end;
the MCU is provided with a first port and a second port;
one end of the first secondary winding is electrically connected with a first movable end of the first relay, the other end of the first secondary winding is electrically connected with a first wiring end of the second relay, a second wiring end of the second relay is electrically connected with a first input end of the rectifier bridge, one end of the second secondary winding is electrically connected with a fixed end of the first relay, the other end of the second secondary winding is electrically connected with a first input end of the rectifier bridge, a first movable end of the first relay is electrically connected with a second input end of the rectifier bridge, and a second movable end of the first relay is electrically connected with a first wiring end of the second relay;
one end of a first coil of the first relay is respectively electrically connected with a first port of the MCU and a base electrode of the triode, the other end of the first coil of the first relay is connected with the switching power supply, a collector of the triode is electrically connected with one end of a second coil of the second relay, the other end of the second coil of the second relay is connected with the switching power supply, and an emitter of the triode is electrically connected with a second port of the MCU.
2. The relay protection circuit of the charger according to claim 1, wherein a resistor is connected in series between the first port of the MCU and the base of the transistor.
3. The relay protection circuit of the charger according to claim 2, wherein the second coil of the second relay is connected in parallel with a diode, and an anode of the diode is connected to a connection point of a collector of the transistor and the second coil of the second relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020758763.3U CN211859581U (en) | 2020-05-09 | 2020-05-09 | Relay protection circuit of charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020758763.3U CN211859581U (en) | 2020-05-09 | 2020-05-09 | Relay protection circuit of charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211859581U true CN211859581U (en) | 2020-11-03 |
Family
ID=73178803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020758763.3U Active CN211859581U (en) | 2020-05-09 | 2020-05-09 | Relay protection circuit of charger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211859581U (en) |
-
2020
- 2020-05-09 CN CN202020758763.3U patent/CN211859581U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Relay protection circuit of charger Effective date of registration: 20211029 Granted publication date: 20201103 Pledgee: Postal Savings Bank of China Limited by Share Ltd Xinchang branch Pledgor: XINCHANG BAIDE ELECTRONICS CO.,LTD. Registration number: Y2021330002084 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |