CN213602861U

CN213602861U - Circuit structure of big lamp plate

Info

Publication number: CN213602861U
Application number: CN202022510408.7U
Authority: CN
Inventors: 陈贤立
Original assignee: Wenzhou Weizheng Electronic Technology Co ltd
Current assignee: Wenzhou Weizheng Electronic Technology Co ltd
Priority date: 2020-11-03
Filing date: 2020-11-03
Publication date: 2021-07-02
Anticipated expiration: 2030-11-03

Abstract

The utility model relates to a circuit structure of headlight board, power supply circuit including the power supply circuit of passing lamp and the power supply circuit of far-reaching headlamp, the power supply circuit of passing lamp includes LED constant current driver chip, and establish ties the sampling resistor who forms the loop, the LED lamp, inductance and freewheel diode, the input power of passing lamp falls into two branch roads behind the modulate circuit, a branch road connects to the power end of LED constant current driver chip, another branch road connects to the power sampling end of LED constant current driver chip through sampling resistor, the output of inductance is connected to the drain terminal of the power switch of LED constant current driver chip. Through the arrangement of the structure, the LED constant-current driving chip, the inductor, the sampling resistor and the fly-wheel diode form the voltage-reducing constant-current control circuit in the continuous inductor current mode of self-oscillation, the output current ripple of the inductor is small, the brightness of the LED lamp is constant, the control current is only related to the sampling resistor, and adjustment is facilitated.

Description

Circuit structure of big lamp plate

Technical Field

The utility model relates to a circuit structure of headlight board.

Background

Headlamps on automobiles include running lights, dipped headlamps and high beams. In the headlamps of an automobile, the low beam and the high beam are particularly important for safe driving of a driver, and therefore, the power supply circuits of the low beam and the high beam need to satisfy the characteristics of constant current, high efficiency, and capability of ensuring the service life of the LED lamp. The circuit structure of current big lamp plate, the structure is complicated, and is inefficient, and the interference killing feature is also relatively poor.

Disclosure of Invention

In view of this, the utility model aims at providing a simple structure, efficient, have certain interference immunity, can ensure passing lamp, far-reaching headlamp life's circuit structure of big lamp plate.

In order to realize above purpose, the utility model discloses a like this include the circuit structure of a big lamp plate, power supply circuit including the power supply circuit of passing lamp and the power supply circuit of far-reaching headlamp, the power supply circuit of passing lamp include LED constant current driver chip to and establish ties sampling resistor, LED lamp, inductance and the freewheel diode that forms the loop, the input power of passing lamp divide into two branch roads behind the conditioning circuit, a branch road connects to the power end of LED constant current driver chip, another branch road warp sampling resistor connect to the power sampling end of LED constant current driver chip, the output of inductance be connected to the drain terminal of the power switch of LED constant current driver chip.

Compared with the prior art, the invention has the beneficial technical effects that: through the arrangement of the structure, the LED constant current driving chip, the inductor, the sampling resistor and the freewheeling diode form a voltage reduction type constant current control circuit in a continuous inductance current mode of self-oscillation, the result of comparison of two voltage values of input conditioning voltage and sampling voltage is used as a driving signal of the switching tube, so that the electric energy of the inductor is increased when the switching tube is switched on, the freewheeling is consumed when the switching tube is switched off, the output current ripple of the inductor is small, the brightness of the LED lamp is constant, the control current is only related to the sampling resistor, and the adjustment is convenient.

Particularly, the conditioning circuit comprises a rectifier bridge, an input power supply of the dipped headlight is connected to an alternating current input end of the rectifier bridge, an output positive electrode end of the rectifier bridge is connected with a conditioning positive voltage of the dipped headlight, and the power supply circuit of the high beam adopts a circuit structure the same as that of the power supply circuit of the dipped headlight. Through the arrangement of the structure, even if the polarity of the input power supply of the dipped headlight and/or the high beam is reversely connected, the dipped headlight and/or the high beam can normally work.

In particular, the input power supply of the high beam is connected to the conditioning positive voltage output end of the dipped headlight through the first diode. Through the setting of above structure, the voltage of passing lamp and reflector lamp can form the clamp system of each other, prevents that input power from receiving the back of disturbing and taking place the voltage sudden change, guarantees that the circuit structure of big lamp plate is not harmed.

In particular, a second diode is connected between the input power supply of the high beam and the conditioning negative voltage output end of the dipped headlight in an anti-parallel mode.

In particular, the power supply circuit of the dipped headlight comprises a first LED lamp and a second LED lamp, the power supply circuit of the high beam comprises a third LED lamp, and the first LED lamp, the second LED lamp and the third LED lamp are 35 х 35.

In particular, the inductance is 100 mh. The larger inductance is selected, so that the ripple of the LED driving current can reach the minimum value.

Particularly, the circuit structure of the large lamp panel further comprises a power circuit of the running lamp, and the power circuit of the running lamp comprises a running lamp input power supply and running lamp conditioning voltage output after the conditioning circuit.

Drawings

Fig. 1 is a circuit diagram of an embodiment of the present invention.

Detailed Description

As shown in fig. 1, a circuit structure of a large lamp panel includes a power supply circuit of a dipped headlight and a power supply circuit of a high beam, the power supply circuit of the dipped headlight includes an LED constant current driving chip U1, and a sampling resistor R1, an LED lamp, an inductor L1 and a freewheeling diode D1 which are connected in series to form a loop, an input power supply JG + of the dipped headlight is divided into two branches after passing through a conditioning circuit, one branch is connected to a power supply terminal U1-VIN of the LED constant current driving chip, the other branch is connected to a power supply sampling terminal U1-CSN of the LED constant current driving chip through the sampling resistor, and an output terminal of the inductor is connected to a drain terminal U1-SW of a power switch of the LED constant current driving chip.

Here, the LED constant current driving chip U1 is PT4115E or SL 2516B. The adoption of the high-end LED constant current driving chip can simplify the circuit structure of the dipped headlight and the high beam.

The conditioning circuit comprises a rectifier bridge DB1, an input power supply JG + of the dipped headlight is connected to an alternating current input end of the rectifier bridge DB1, an output positive terminal of the rectifier bridge DB1 is connected with a conditioning positive voltage of the dipped headlight, and the power circuit of the high beam adopts a circuit structure the same as that of the power circuit of the dipped headlight.

The input power YG + of the high beam is connected to the regulated positive voltage output VCC-JG of the low beam through the first diode D4.

The second diode D3 is connected in anti-parallel between the input power YG + of the high beam and the conditioning negative voltage output GND-JG of the dipped headlight.

The power circuit of the dipped headlight comprises a first LED light LED1 and a second LED light LED2, the power circuit of the high beam comprises a third LED light LED3, and the first LED light LED1, the second LED light LED2 and the third LED light LED3 are 35 х 35 in size.

The inductances L1, L2 are 100 mh. The larger inductance is selected, so that the ripple of the LED driving current can reach the minimum value.

The circuit structure of big lamp plate still includes the power supply circuit of driving lamp, and the power supply circuit of driving lamp includes driving lamp input power XC-IN +, and the driving lamp of output behind the conditioning circuit conditions voltage XC +.

Claims

1. A circuit structure of a big lamp panel is characterized in that: the power supply circuit of the dipped headlight comprises an LED constant-current driving chip, a sampling resistor, an LED lamp, an inductor and a freewheeling diode which are connected in series to form a loop, wherein an input power supply of the dipped headlight is divided into two branches after passing through a conditioning circuit, one branch is connected to a power supply end of the LED constant-current driving chip, the other branch is connected to a power supply sampling end of the LED constant-current driving chip through the sampling resistor, and an output end of the inductor is connected to a drain end of a power switch of the LED constant-current driving chip.

2. The circuit structure of big lamp plate of claim 1, characterized in that: the conditioning circuit comprises a rectifier bridge, an input power supply of the dipped headlight is connected to an alternating current input end of the rectifier bridge, an output positive end of the rectifier bridge is connected with a conditioning positive voltage of the dipped headlight, and the power supply circuit of the high beam adopts a circuit structure the same as that of the dipped headlight.

3. The circuit structure of big lamp plate of claim 1 or 2, characterized in that: the input power supply of the high beam is connected to the conditioning positive voltage output end of the dipped headlight through the first diode.

4. The circuit structure of big lamp plate of claim 3, characterized in that: and a second diode is connected between the input power supply of the high beam and the conditioning negative voltage output end of the dipped headlight in an anti-parallel mode.

5. The circuit structure of big lamp plate of claim 1 or 2, characterized in that: the power supply circuit of dipped headlight include first LED lamp and second LED lamp, the power supply circuit of far reaching headlamp include the third LED lamp, first LED lamp, second LED lamp and third LED lamp adopt the size of 35 х 35.

6. The circuit structure of big lamp plate of claim 1, characterized in that: the inductance is 100 mh.

7. The circuit structure of big lamp panel of claim 1, 2, 4 or 6, characterized in that: the circuit structure of big lamp plate still include the power supply circuit of driving lamp, the power supply circuit of driving lamp include driving lamp input power to and the driving lamp regulation voltage of output behind the regulation circuit.