CN214985780U - Circuit device for controlling tail lamp of electric bicycle - Google Patents
Circuit device for controlling tail lamp of electric bicycle Download PDFInfo
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- CN214985780U CN214985780U CN202023227723.5U CN202023227723U CN214985780U CN 214985780 U CN214985780 U CN 214985780U CN 202023227723 U CN202023227723 U CN 202023227723U CN 214985780 U CN214985780 U CN 214985780U
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- tail lamp
- circuit
- electric bicycle
- lamp control
- dcdc
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Abstract
The utility model relates to a circuit arrangement for electric bicycle tail lamp control, including DCDC step-down circuit and tail lamp control circuit, the tail lamp control circuit includes battery positive pole B +, battery negative pole GND, the tail lamp is connected between WD and GND; the DCDC voltage reduction circuit gets electricity from the positive pole VBAT of the battery, outputs the power VCC of the car lamp after voltage reduction, and is provided with a diode D1 and a triode Q1 through the tail lamp control circuit, wherein the triode Q1 is further connected with a resistor R1, a motor controller U1 and a tail lamp switch WDSW, and the tail lamp is connected with the tail lamp switch WDSW. The utility model discloses simple structure, low cost. The damage of the lamp control circuit and the DCDC circuit at the moment of battery insertion is effectively avoided.
Description
Technical Field
The utility model relates to a bicycle tail lamp field, concretely relates to circuit arrangement for electric bicycle tail lamp control.
Background
The conventional tail lamp control circuit of the electric bicycle can cause the damage of the lamp control circuit and the DCDC circuit at the moment of battery insertion.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a circuit arrangement for electric bicycle tail lamp control.
The utility model discloses a following technical scheme realizes above-mentioned purpose: a circuit device for controlling tail lamps of electric bicycles comprises a DCDC voltage reduction circuit and a tail lamp control circuit, wherein the tail lamp control circuit comprises a battery anode B + and a battery cathode GND, and a tail lamp is connected between WD and GND; the DCDC voltage reduction circuit gets electricity from the positive pole VBAT of the battery, outputs the power VCC of the car lamp after voltage reduction, and is provided with a diode D1 and a triode Q1 through the tail lamp control circuit, wherein the triode Q1 is further connected with a resistor R1, a motor controller U1 and a tail lamp switch WDSW, and the tail lamp is connected with the tail lamp switch WDSW.
Further, the tail lamp control circuit is provided with two capacitors C1 and one capacitor C3.
Further, D1 is located between two capacitors C1, and the transistor Q1 is located between the capacitor C1 and the capacitor C3.
Further, diode D1 is used to protect against overvoltage, when D1 is turned off and Q1 is turned on, transient current is prevented from entering the DCDC output port and transistor Q1 from WD port.
Further, the transistor Q1 is used to prevent the D1 from being turned on when the negative voltage is generated, and the Q1 turns off to prevent the negative voltage from appearing at the output port of the DCDC circuit.
Compared with the prior art, the utility model discloses a circuit arrangement for electric bicycle tail lamp control's beneficial effect is: simple structure and low cost. The damage of the lamp control circuit and the DCDC circuit at the moment of battery insertion is effectively avoided.
Drawings
Fig. 1 is a schematic structural diagram of a circuit arrangement for controlling a tail lamp of an electric bicycle.
Detailed Description
Referring to fig. 1, a circuit device for controlling a tail lamp of an electric bicycle comprises a DCDC voltage-reducing circuit and a tail lamp control circuit, wherein the tail lamp control circuit comprises a battery anode B + and a battery cathode GND, and the tail lamp is connected between WD and GND; the DCDC voltage reduction circuit gets electricity from the positive pole VBAT of the battery, and outputs the power VCC of the car lamp after voltage reduction.
The tail lamp control circuit heretofore has the following problems:
1. at the moment of inserting the connector, because large equivalent impedance of an electrolytic capacitor loop is extremely small between a port B + of the controller and GND, spark discharge can be generated at the moment when the port B + of the controller is connected with the GND, and instantaneous overvoltage which can reach the battery voltage to the maximum can be generated on a WD loop when electric sparks splash to a WD connecting pin of a tail lamp, so that a tail lamp control circuit and a DCDC circuit are damaged when the circuit design is improper.
2. At the moment of inserting the connector, when the port B + of the controller is connected with the WD socket and the GND is not connected, a negative voltage which reaches the battery voltage at the maximum is generated on the WD signal at the moment, and the tail lamp control circuit is damaged when the circuit design is not proper.
The tail lamp control circuit is provided with a diode D1 and a triode Q1. The tail lamp control circuit is provided with two capacitors C1 and a capacitor C3, D1 is located between the two capacitors C1, a triode Q1 is located between a capacitor C1 and a capacitor C3, the triode Q1 is further connected with a resistor R1, a motor controller U1 and a tail lamp switch WDSW, and the tail lamp is connected with the tail lamp switch WDSW.
The diode D1 is used to protect the DCDC circuit and the transistor Q1 from damage by turning off the D1 (when the Q1 is turned on) when an over-voltage occurs, and preventing transient current from entering the DCDC output port and the transistor Q1 from the WD port.
The transistor Q1 is used to prevent the negative voltage from appearing at the output port of the DCDC circuit and causing damage to the DCDC circuit when the Q1 is turned off (when D1 is turned on) when the negative voltage is generated.
The utility model discloses a priority is: simple structure and low cost. The damage of the lamp control circuit and the DCDC circuit at the moment of battery insertion is effectively avoided.
What has been described above are only some embodiments of the invention. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are within the scope of the invention.
Claims (5)
1. A circuit arrangement for controlling a tail light of an electric bicycle, characterized in that: the tail lamp control circuit comprises a battery anode B + and a battery cathode GND, and the tail lamp is connected between WD and GND; the DCDC voltage reduction circuit gets electricity from the positive pole VBAT of the battery, outputs the power VCC of the car lamp after voltage reduction, and is provided with a diode D1 and a triode Q1 through the tail lamp control circuit, wherein the triode Q1 is further connected with a resistor R1, a motor controller U1 and a tail lamp switch WDSW, and the tail lamp is connected with the tail lamp switch WDSW.
2. The circuit arrangement for electric bicycle taillight control according to claim 1, characterized in that: the tail lamp control circuit is provided with two capacitors C1 and a capacitor C3.
3. The circuit arrangement for electric bicycle taillight control according to claim 1, characterized in that: the D1 is located between two capacitors C1, and the transistor Q1 is located between the capacitor C1 and the capacitor C3.
4. The circuit arrangement for electric bicycle taillight control according to claim 1, characterized in that: the diode D1 is used to protect the diode D1 from turning off and the transistor Q1 from turning on when an overvoltage occurs, thereby preventing transient current from entering the DCDC output port and the transistor Q1 from the WD port.
5. The circuit arrangement for electric bicycle taillight control according to claim 1, characterized in that: the transistor Q1 is used to prevent the D1 from turning on when the negative voltage is generated, and to prevent the negative voltage from appearing at the output port of the DCDC circuit when the Q1 turns off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023227723.5U CN214985780U (en) | 2020-12-28 | 2020-12-28 | Circuit device for controlling tail lamp of electric bicycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023227723.5U CN214985780U (en) | 2020-12-28 | 2020-12-28 | Circuit device for controlling tail lamp of electric bicycle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214985780U true CN214985780U (en) | 2021-12-03 |
Family
ID=79141111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023227723.5U Active CN214985780U (en) | 2020-12-28 | 2020-12-28 | Circuit device for controlling tail lamp of electric bicycle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214985780U (en) |
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2020
- 2020-12-28 CN CN202023227723.5U patent/CN214985780U/en active Active
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