阅读说明：本技术 日行灯电路 (Day drive lamp circuit ) 是由 甘淼 于 2020-05-12 设计创作，主要内容包括：本发明为一种日行灯电路。它包括电源输入单元、LED负载单元、线性IC调节单元和输出采样单元；所述线性IC调节单元分别与所述电源输入单元、输出采样单元和LED负载单元相连。本发明电路结构更加简单、应用范围更广,主要解决了分离式恒流电路,元件使用数量较多,难以进行小型化设计的问题,本发明通过所述线性IC调节单元和输出采样单元,降低线性电路的设计难度,扩展使用范围。(The invention relates to a daytime running light circuit. The LED load-adjustable LED drive circuit comprises a power input unit, an LED load unit, a linear IC adjusting unit and an output sampling unit; and the linear IC regulating unit is respectively connected with the power input unit, the output sampling unit and the LED load unit. The circuit structure is simpler, the application range is wider, the problems that a separated constant current circuit is large in element using quantity and difficult to design in a miniaturized mode are mainly solved, the design difficulty of the linear circuit is reduced through the linear IC adjusting unit and the output sampling unit, and the application range is expanded.)

1. The utility model provides a day portable lighter circuit, includes power input unit, LED load cell, its characterized in that: the circuit also comprises a linear IC regulating unit and an output sampling unit; the linear IC adjusting unit is respectively connected with the power input unit, the output sampling unit and the LED load unit;

the linear IC regulating unit comprises a control chip U1, a resistor R4, a resistor R9 and a resistor R8, wherein the control chip U1 comprises a VIN pin, an EN pin, a PWM1 pin, a PWM2 pin, a PWM3 pin, a TEMP pin, a GND pin, an OUT1 pin, an OUT2 pin, an OUT3 pin, a VSNS1 pin, a VSNS2 pin, a VSNS3 pin, a REF pin and an EP pin; the output sampling unit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R5, a resistor R6, a resistor R7, a capacitor C2, a capacitor C3 and a capacitor C4; the LED load unit comprises a first lamp group, a second lamp group and a third lamp group which are connected in parallel;

one end of the resistor R1 is respectively connected with the OUT3 pin, one end of the capacitor C2 and the first lamp group; the other end of the resistor R1 is respectively connected with one end of the VSNS3 pin and one end of the resistor R5; one end of the resistor R2 is respectively connected with the OUT2 pin, one end of the capacitor C3 and the second lamp group, and the other end of the resistor R2 is respectively connected with the VSNS2 pin and one end of the resistor R6; one end of the resistor R3 is respectively connected with the OUT1 pin, one end of the capacitor C4 and the third lamp group, and the other end of the resistor R3 is respectively connected with the VSNS1 pin and one end of the resistor R7; the other end of the resistor R5 is connected with the other end of the capacitor C2, the other end of the resistor R6, the other end of the capacitor C3, the other end of the resistor R7 and the other end of the capacitor C4, then is grounded, and is respectively connected with one end of a resistor R8 and an EP pin of the LED load unit and the linear IC regulating unit; the other end of the resistor R8 is connected to the REF pin.

2. The daytime running light circuit of claim 1, wherein: the power input unit comprises an interface provided with a first pin P1 and a second pin P2, a bidirectional transient suppression diode D2, a diode D1, a capacitor C1, a capacitor C7, a capacitor C5 and a capacitor C6; the second pin P2 is respectively connected with one end of the bidirectional transient suppression diode D2, one end of the capacitor C1 and the anode of the diode D1; the cathode of the diode D1 is respectively connected with one end of the capacitor C5, one end of the capacitor C6, the VIN pin and one end of the resistor R4; the other end of the resistor R4 is respectively connected with the EN pin, the PWM1 pin, the PWM2 pin and the PWM3 pin;

the other end of the capacitor C1 is connected with one end of the capacitor C7; the first pin P1, the other end of the bidirectional transient suppression diode D2, the other end of the capacitor C7, the other end of the capacitor C5 and the other end of the capacitor C6 are connected and then grounded, and are respectively connected with one end of the resistor R9 and a GND pin; the other end of the resistor R9 is connected with the TEMP pin.

3. The daytime running light circuit of claim 1, wherein: the first lamp group is composed of a light emitting diode LD1 and a light emitting diode LD4 which are connected in series, the second lamp group is composed of a light emitting diode LD2 and a light emitting diode LD5 which are connected in series, and the third lamp group is composed of a light emitting diode LD3 and a light emitting diode LD4 which are connected in series.

4. The daytime running light circuit according to claim 2, wherein: the capacitor C1, the capacitor C5, the capacitor C6 and the capacitor C7 are filter capacitors respectively.

5. The daytime running light circuit of claim 1, wherein: the control chip U1 is a TPS92630Q chip.

Technical Field

The invention relates to a vehicle lamp circuit, in particular to a daytime running lamp circuit.

Background

At present, automobile lamps are developing towards the situation that halogen bulbs are comprehensively replaced by LED lamps, and a linear constant current circuit is taken as one of the most common LED circuits and has a wide application range. The existing separated constant current circuit has more elements, is difficult to carry out miniaturization design and has larger design difficulty of a linear circuit.

Disclosure of Invention

The invention aims to overcome the problems in the prior art and provide a daytime running light circuit which is simpler in structure and wider in application range.

The invention is realized by the following steps: a daytime running light circuit comprises a power input unit, an LED load unit, a linear IC adjusting unit and an output sampling unit; the linear IC adjusting unit is respectively connected with the power input unit, the output sampling unit and the LED load unit;

the linear IC regulating unit comprises a control chip U1, a resistor R4, a resistor R9 and a resistor R8, wherein the control chip U1 comprises a VIN pin, an EN pin, a PWM1 pin, a PWM2 pin, a PWM3 pin, a TEMP pin, a GND pin, an OUT1 pin, an OUT2 pin, an OUT3 pin, a VSNS1 pin, a VSNS2 pin, a VSNS3 pin, a REF pin and an EP pin; the output sampling unit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R5, a resistor R6, a resistor R7, a capacitor C2, a capacitor C3 and a capacitor C4; the LED load unit comprises a first lamp group, a second lamp group and a third lamp group which are connected in parallel;

one end of the resistor R1 is respectively connected with the OUT3 pin, one end of the capacitor C2 and the first lamp group; the other end of the resistor R1 is respectively connected with one end of the VSNS3 pin and one end of the resistor R5; one end of the resistor R2 is respectively connected with the OUT2 pin, one end of the capacitor C3 and the second lamp group, and the other end of the resistor R2 is respectively connected with the VSNS2 pin and one end of the resistor R6; one end of the resistor R3 is respectively connected with the OUT1 pin, one end of the capacitor C4 and the third lamp group, and the other end of the resistor R3 is respectively connected with the VSNS1 pin and one end of the resistor R7; the other end of the resistor R5 is connected with the other end of the capacitor C2, the other end of the resistor R6, the other end of the capacitor C3, the other end of the resistor R7 and the other end of the capacitor C4, then is grounded, and is respectively connected with one end of a resistor R8 and an EP pin of the LED load unit and the linear IC regulating unit; the other end of the resistor R8 is connected to the REF pin.

The power input unit comprises an interface provided with a first pin P1 and a second pin P2, a bidirectional transient suppression diode D2, a diode D1, a capacitor C1, a capacitor C7, a capacitor C5 and a capacitor C6; the second pin P2 is respectively connected with one end of the bidirectional transient suppression diode D2, one end of the capacitor C1 and the anode of the diode D1; the cathode of the diode D1 is respectively connected with one end of the capacitor C5, one end of the capacitor C6, the VIN pin and one end of the resistor R4; the other end of the resistor R4 is respectively connected with the EN pin, the PWM1 pin, the PWM2 pin and the PWM3 pin;

the other end of the capacitor C1 is connected with one end of the capacitor C7; the first pin P1, the other end of the bidirectional transient suppression diode D2, the other end of the capacitor C7, the other end of the capacitor C5 and the other end of the capacitor C6 are connected and then grounded, and are respectively connected with one end of the resistor R9 and a GND pin; the other end of the resistor R9 is connected with the TEMP pin.

The first lamp group is composed of a light emitting diode LD1 and a light emitting diode LD4 which are connected in series, the second lamp group is composed of a light emitting diode LD2 and a light emitting diode LD5 which are connected in series, and the third lamp group is composed of a light emitting diode LD3 and a light emitting diode LD4 which are connected in series.

The capacitor C1, the capacitor C5, the capacitor C6 and the capacitor C7 are filter capacitors respectively.

The control chip U1 is a TPS92630Q chip.

The invention has the beneficial effects that: the circuit structure is simpler, the application range is wider, the problems that a separated constant current circuit is large in element using quantity and difficult to design in a miniaturized mode are mainly solved, the design difficulty of the linear circuit is reduced through the linear IC adjusting unit and the output sampling unit, and the application range is expanded.

The capacitor C1, the capacitor C5, the capacitor C6 and the capacitor C7 of the power input unit are respectively filter capacitors, the diode D1 is anti-reverse-connected, and the bidirectional transient suppression diode D2 is effectively lightning-proof, so that an input protection circuit is formed; the linear IC adjusting unit can adjust the constant current output by each path through a resistor R8, the maximum current of each path is 150Ma, the total output is 450mA, the output sampling unit confirms the change of the output voltage of each path through resistor voltage division sampling to judge whether the circuit has a short circuit or open circuit phenomenon, the protection purpose is achieved, and the LED load can be adjusted according to the actual situation.

Drawings

FIG. 1 is a schematic diagram of the present invention.

Wherein: 1. a power input unit; 2. a linear IC adjusting unit; 3. an output sampling unit; 4. an LED load unit; 5. a first lamp group; 6. a second lamp group; 7. and a third lamp group.

Detailed Description

According to fig. 1, the present invention includes a power input unit 1, an LED load unit 4, a linear IC adjusting unit 2, and an output sampling unit 3; the linear IC adjusting unit 2 is connected to the power input unit 1, the output sampling unit 3, and the LED load unit 4, respectively.

The linear IC regulating unit 2 comprises a control chip U1, a resistor R4, a resistor R9 and a resistor R8, wherein the control chip U1 comprises a VIN pin, an EN pin, a PWM1 pin, a PWM2 pin, a PWM3 pin, a TEMP pin, a GND pin, an OUT1 pin, an OUT2 pin, an OUT3 pin, a VSNS1 pin, a VSNS2 pin, a VSNS3 pin, a REF pin and an EP pin; the output sampling unit 3 comprises a resistor R1, a resistor R2, a resistor R3, a resistor R5, a resistor R6, a resistor R7, a capacitor C2, a capacitor C3 and a capacitor C4; the LED load unit 4 includes a first lamp group 5, a second lamp group 6, and a third lamp group 7 connected in parallel to each other. The first lamp group 5 is composed of a light emitting diode LD1 and a light emitting diode LD4 which are connected in series, the second lamp group 6 is composed of a light emitting diode LD2 and a light emitting diode LD5 which are connected in series, and the third lamp group 7 is composed of a light emitting diode LD3 and a light emitting diode LD4 which are connected in series. The control chip U1 is a TPS92630Q chip.

One end of the resistor R1 is respectively connected with the OUT3 pin, one end of the capacitor C2 and the first lamp group 5; the other end of the resistor R1 is respectively connected with one end of the VSNS3 pin and one end of the resistor R5; one end of the resistor R2 is respectively connected with the OUT2 pin, one end of the capacitor C3 and the second lamp group 6, and the other end of the resistor R2 is respectively connected with the VSNS2 pin and one end of the resistor R6; one end of the resistor R3 is connected to the OUT1 pin, one end of the capacitor C4, and the third lamp group 7, respectively, and the other end of the resistor R3 is connected to the VSNS1 pin and one end of the resistor R7, respectively; the other end of the resistor R5 is connected with the other end of the capacitor C2, the other end of the resistor R6, the other end of the capacitor C3, the other end of the resistor R7 and the other end of the capacitor C4, then is grounded, and is respectively connected with one end of a resistor R8 and an EP pin of the LED load unit and the linear IC regulating unit; the other end of the resistor R8 is connected to the REF pin.

The power input unit comprises an interface provided with a first pin P1 and a second pin P2, a bidirectional transient suppression diode D2, a diode D1, a capacitor C1, a capacitor C7, a capacitor C5 and a capacitor C6; the second pin P2 is respectively connected with one end of the bidirectional transient suppression diode D2, one end of the capacitor C1 and the anode of the diode D1; the cathode of the diode D1 is respectively connected with one end of the capacitor C5, one end of the capacitor C6, the VIN pin and one end of the resistor R4; the other end of the resistor R4 is respectively connected with the EN pin, the PWM1 pin, the PWM2 pin and the PWM3 pin. The capacitor C1, the capacitor C5, the capacitor C6 and the capacitor C7 are filter capacitors respectively.

The other end of the capacitor C1 is connected with one end of the capacitor C7; the first pin P1, the other end of the bidirectional transient suppression diode D2, the other end of the capacitor C7, the other end of the capacitor C5 and the other end of the capacitor C6 are connected and then grounded, and are respectively connected with one end of the resistor R9 and a GND pin; the other end of the resistor R9 is connected with the TEMP pin.

The control chip U1 is a TPS92630Q chip manufactured by Texas Instruments (TI) in usa, and the TPS92630Q chip is a three-channel linear LED driver with analog and PWM dimming.

The capacitor C1, the capacitor C5, the capacitor C6 and the capacitor C7 are input filter capacitors, the diode D1 is in reverse connection prevention, the bidirectional transient suppression diode D2 is in lightning protection, and a protection circuit of the power input unit is formed. The capacitor C2, the capacitor C3 and the capacitor C4 are output capacitors, the VIN pin is a linear chip input pin, and the EN pin is an enable pin; the PWM1 pin, the PWM2 pin and the PWM3 pin are three-way LED linear circuit PWM dimming pins, and dimming can be performed through PWM signals. The circuit of the invention is directly pulled high through the resistor R4, and a PWM dimming mode is cancelled. The FAULT pin and the FAULT _ S pin are FAULT feedback pins, the resistor R8 is used for setting the full current of each path of LED, the resistor R9 is an NTC resistance value capable of detecting temperature change, and the output current can be reduced after the resistance value exceeds a threshold value, so that the IC temperature is prevented from being too high. The pin OUT1, the pin OUT2 and the pin OUT3 are three-way linear current output pins, the pin VSNS1, the pin VSNS2 and the pin VSNS3 are three-way voltage detection pins, a precise voltage divider is formed by a resistor R1, a resistor R2, a resistor R3, a resistor R5, a resistor R6 and a resistor R7, monitoring is carried OUT simultaneously, voltage can be unbalanced after any one of the two pins fails, sampling is carried OUT through the pin VSNS, comparison is carried OUT, whether abnormity occurs or not is judged, and output is interrupted after the abnormity occurs.