CN219428274U

CN219428274U - Tail lamp current limiting protection circuit of electric bicycle motor controller

Info

Publication number: CN219428274U
Application number: CN202223575325.1U
Authority: CN
Inventors: 张登基; 张洺玮
Original assignee: Xianle Power Control Technology Shanghai Co ltd
Current assignee: Xianle Power Control Technology Shanghai Co ltd
Priority date: 2022-12-31
Filing date: 2022-12-31
Publication date: 2023-07-28
Anticipated expiration: 2032-12-31

Abstract

The utility model relates to a tail lamp current limiting protection circuit of an electric bicycle motor controller, which comprises a current limiting protection circuit, an input VLMP, an output VOUT, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first triode Q1, a second triode Q2, a third triode Q3 and a tail lamp switching signal SW, wherein the first resistor R1 is connected with the first triode Q1 in series and then is connected with the output VOUT, the second triode Q2 is connected with the first resistor R1 in parallel, the base electrode of the first triode Q1 is connected with the second resistor R2, and the third resistor R3 is respectively connected with the fourth resistor R4 and the base electrode of the third triode Q3; when the voltage at two ends of the first resistor R1 rises to the conducting voltage of the emitting junction of the second triode Q2, the second triode Q2 is conducted; the collector terminal current Ic of the second triode Q2 divides the base terminal current Ib of part of the first triode Q1, so that the collector terminal current Ic of the first triode Q1 is reduced, the VOUT output current is also reduced, and finally the output load current reaches a balanced state.

Description

Tail lamp current limiting protection circuit of electric bicycle motor controller

Technical Field

The utility model relates to the technical field of electric bicycle motor controllers, in particular to a tail lamp current-limiting protection circuit of an electric bicycle motor controller.

Background

The electric bicycle is used as a public travel tool and is spread at all corners in daily life, and in the existing electric bicycle motor controller, a tail lamp circuit is simple in structure and has an infinite current protection function. When the load of the tail lamp is over-current or short-circuited, the lamp circuit may be burnt out, which is unfavorable for the reliability of the product.

How to design a design benefit, simple structure, with low costs, the reliability is high, increases the current limiting protect function of tail lamp circuit, when making the tail lamp load overcurrent or short circuit, the tail lamp circuit still can normally work, a kind of electric bicycle motor controller tail lamp current limiting protect circuit of the reliability of assurance product is the problem that needs to solve at present.

Disclosure of Invention

In order to solve in the current electric bicycle motor controller, tail lamp circuit structure is simple, unlimited flow protect function. The utility model provides a tail lamp current limiting protection circuit of an electric bicycle motor controller, which is ingenious in design and simple in structure, and can increase the current limiting protection function of the tail lamp circuit, so that the tail lamp circuit can still work normally when the tail lamp load is over-current or short-circuited, and the reliability of products is guaranteed.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides an electric bicycle motor controller tail lamp current limiting protection circuit, including current limiting protection circuit, input VLMP, output VOUT, first resistance R1, second resistance R2, third resistance R3, fourth resistance R4, first triode Q1, second triode Q2, third triode Q3 and tail lamp switching signal SW, wherein, output VOUT is connected after first resistance R1 and first triode Q1 establish ties, second triode Q2 and first resistance R1 parallel connection, second resistance R2 is connected to first triode Q1's base, fourth resistance R4 and third triode Q3 base are connected respectively to third resistance R3; when the load current of the output VOUT increases, the voltage at two ends of the first resistor R1 increases, and when the voltage rises to the conducting voltage of the emitting junction of the second triode Q2, the second triode Q2 is conducted; the collector terminal current Ic of the second triode Q2 divides the base terminal current Ib of part of the first triode Q1, so that the collector terminal current Ic of the first triode Q1 is reduced, the VOUT output current is also reduced, and finally the output load current reaches a balanced state.

As a further optimization scheme of the tail lamp current-limiting protection circuit of the electric bicycle motor controller, the first triode Q1 and the second triode Q2 adopt PNP triodes.

As a further optimization scheme of the tail lamp current-limiting protection circuit of the electric bicycle motor controller, the third triode Q3 adopts an NPN triode.

Compared with the prior art, the utility model has the beneficial effects that:

the utility model increases the current limiting protection function of the tail lamp circuit, so that the lamp circuit can still work normally when the lamp load is over-current or short-circuited, thereby ensuring the reliability of the product. The current limiting protection circuit is suitable for most power supply circuits without current protection.

Drawings

FIG. 1 is a schematic diagram of the circuit element connections of the present utility model;

fig. 2 is a schematic diagram of the circuit principle of the present utility model.

Detailed Description

The following describes the embodiments of the present utility model in further detail with reference to the drawings.

Referring to fig. 1 and 2, fig. 1 is a schematic diagram of connection of circuit elements of the present utility model, fig. 2 is a schematic diagram of a circuit principle of the present utility model, and a tail lamp current limiting protection circuit of an electric bicycle motor controller includes a current limiting protection circuit, an input VLMP, an output VOUT, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first triode Q1, a second triode Q2, a third triode Q3, and a tail lamp switching signal SW, where the first resistor R1 is connected in series with the first triode Q1 and then connected with the output VOUT, the second triode Q2 is connected in parallel with the first resistor R1, a base of the first triode Q1 is connected with the second resistor R2, and the third resistor R3 is connected with bases of the fourth resistor R4 and the third triode Q3, respectively; when the load current of the output VOUT increases, the voltage at two ends of the first resistor R1 increases, and when the voltage rises to the conducting voltage of the emitting junction of the second triode Q2, the second triode Q2 is conducted; the collector terminal current Ic of the second triode Q2 divides the base terminal current Ib of part of the first triode Q1, so that the collector terminal current Ic of the first triode Q1 is reduced, the VOUT output current is also reduced, and finally the output load current reaches a balanced state.

In actual operation, the working principle of the utility model is as follows: when the tail lamp switch signal SW is at a high level, the third triode Q3 is conducted, and the first triode Q1 is conducted; meanwhile, the first triode Q1 works in an amplifying state, and the output current of VOUT is a fixed value. When the VOUT load current increases, the VR1 two-stage voltage also increases, and when the voltage reaches the turn-on voltage of the second triode Q2, the collector current Ic of the second triode Q2 will divide part of the current Ib of the base terminal of the first triode Q1, resulting in a decrease of the current Ib of the base terminal of the first triode Q1. Because the first triode Q1 works in the amplifying region, the current Ic at the collector end of the first triode Q1 synchronously drops, and the current VOUT drops, so that the current limiting effect is finally achieved.

The utility model has ingenious design and simple structure, and increases the current limiting protection function of the tail lamp circuit, so that the tail lamp circuit can still work normally when the tail lamp is overloaded or shorted, the reliability of products is ensured, and the problems of simple structure and infinite current protection function of the tail lamp circuit in the existing motor controller of the electric bicycle are solved. When the tail lamp is overloaded or short-circuited, the lamp circuit is possibly burnt out, which is not beneficial to the technical problems of reliability and the like of products, and the lamp has good market prospect and development space for the prior art.

While the preferred embodiments and examples of the present utility model have been described in detail with reference to the accompanying drawings, the present utility model is not limited to the above-described embodiments and examples, and various changes may be made within the knowledge of those skilled in the art without departing from the spirit of the present utility model.

Claims

1. A current-limiting protection circuit for a tail lamp of an electric bicycle motor controller is characterized in that: the current limiting protection circuit comprises a current limiting protection circuit, an input VLMP, an output VOUT, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first triode Q1, a second triode Q2, a third triode Q3 and a tail lamp switching signal SW, wherein the first resistor R1 is connected with the first triode Q1 in series and then is connected with the output VOUT, the second triode Q2 is connected with the first resistor R1 in parallel, the base electrode of the first triode Q1 is connected with the second resistor R2, and the third resistor R3 is respectively connected with the base electrodes of the fourth resistor R4 and the third triode Q3; when the load current of the output VOUT increases, the voltage at two ends of the first resistor R1 increases, and when the voltage rises to the conducting voltage of the emitting junction of the second triode Q2, the second triode Q2 is conducted; the collector terminal current Ic of the second triode Q2 divides the base terminal current Ib of part of the first triode Q1, so that the collector terminal current Ic of the first triode Q1 is reduced, the VOUT output current is also reduced, and finally the output load current reaches a balanced state.

2. The electric bicycle motor controller tail lamp current limiting protection circuit of claim 1, wherein: the first triode Q1 and the second triode Q2 adopt PNP triodes.

3. The electric bicycle motor controller tail lamp current limiting protection circuit of claim 1, wherein: the third triode Q3 adopts an NPN triode.