CN107512216B - Control circuit of automobile daytime running lamp and position lamp integrated lamp - Google Patents

Control circuit of automobile daytime running lamp and position lamp integrated lamp Download PDF

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CN107512216B
CN107512216B CN201710612253.8A CN201710612253A CN107512216B CN 107512216 B CN107512216 B CN 107512216B CN 201710612253 A CN201710612253 A CN 201710612253A CN 107512216 B CN107512216 B CN 107512216B
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lamp
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triode
resistor
switch
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CN107512216A (en
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何飞
肖星
易伟
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Chery Automobile Co Ltd
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Chery Automobile Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60QARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/26Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to indicate the vehicle, or parts thereof, or to give signals, to other traffic
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60QARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q2400/00Special features or arrangements of exterior signal lamps for vehicles
    • B60Q2400/30Daytime running lights [DRL], e.g. circuits or arrangements therefor

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

The invention aims to provide a control circuit of an automobile daytime running lamp and position lamp integrated lamp, which can meet the requirements of position lamps, daytime running lamps and the like on different luminous intensities of light sources, and can also meet the requirement of relevant regulations because all the other light sources stop working after one light source is disconnected. The invention adopts the simple triode amplifying circuit to realize the requirements of different luminous intensities of the position lamp and the daytime running LED, realizes the function that one path of LED is broken and the rest LEDs stop working by using the switching characteristic of the triode, is completely built by adopting discrete analog elements on the premise of meeting the requirements of corresponding regulations on the control circuit, has low cost, fully considers the dangerous condition possibly encountered by the control circuit in the working process and is provided with corresponding protection circuits, such as a filter circuit, a transient voltage suppression circuit and the like, and the position lamp circuit and the daytime running lamp circuit do not interfere with each other in the working process, thereby improving the reliability of the control circuit.

Description

Control circuit of automobile daytime running lamp and position lamp integrated lamp
Technical Field
The invention relates to the technical field of automobile illumination, in particular to a control circuit of an automobile daytime running lamp and position lamp integrated lamp.
Background
Currently, daytime running lights and position lights have become the mainstream trend, but due to the limitations of shape and space, the position lights and the daytime running lights have to be integrated on the same light source in many cases. In the national standard, the point light source controller can be used for controlling the luminous intensity if the daytime running lamp is mixed with other functions to use the same light source, namely the luminous intensity of the light source can be changed by changing the current flowing through the light source, so that the same light source can simultaneously meet the regulation requirements of a position lamp and the daytime running lamp. Therefore, the automotive lighting system requires such a circuit to achieve its integrated functions of the position light and the daytime running light.
United nations european economic commission automobile regulation (ECE) R87 third revision 7.4 provisions "for daytime running lights consisting of more than one light source, a minimum luminous intensity is to be met when any one of the light sources fails; when all light sources are simultaneously lit, the prescribed maximum luminous intensity must not be exceeded. A light source group is considered a light source "if its connection would cause all light sources to cease emitting light if one light source fails. Therefore, the circuit should include a light source failure protection circuit to stop the entire lamp when one light source fails and cannot meet the minimum regulatory intensity.
Disclosure of Invention
The invention aims to provide a control circuit of an automobile daytime running lamp and position lamp integrated lamp, which can meet the requirements of position lamps, daytime running lamps and the like on different luminous intensities of light sources, and can also meet the requirement of relevant regulations because all the other light sources stop working after one light source is disconnected.
The control circuit of the automobile daytime running lamp and position lamp integrated lamp comprises a daytime running lamp control signal input end, a position lamp control signal input end and a lamp source group formed by connecting at least two lamp sources in parallel, wherein each lamp source is provided with one bulb or a plurality of serially connected bulbs; the key point is that the daytime running light control signal input end is connected with the position light control signal input end through a one-way conduction circuit; each lamp source corresponds to one switch circuit; one end of each lamp source in the lamp source group is connected with the position lamp control signal input end, the other end of each lamp source in the lamp source group is grounded through a switch circuit, and the switch circuit is formed by connecting a first switch and a second switch in parallel; the position lamp control signal input end is connected with the control end of the first switch to control whether the first switch is conducted or not; the daytime running light control signal input end is connected with the control end of the second switch to control whether the second switch is conducted or not; the control circuit of the automobile daytime running lamp and position lamp integrated lamp further comprises a feedback circuit, the feedback circuit is composed of fault detection circuits and fault control circuits, the number of the fault detection circuits corresponds to the number of the lamp sources, the fault detection circuits detect whether the corresponding lamp sources have open circuit faults or not, and send control signals to the fault control circuits after the open circuit faults occur, and the fault control circuits close all the first switches and the second switches in the lamp source groups; the priority of the fault control circuit for controlling the first switch is greater than the priority of the position lamp control signal input end for controlling the first switch, and the priority of the fault control circuit for controlling the second switch is greater than the priority of the daytime running lamp control signal input end for controlling the second switch.
The working principle of the control circuit of the automobile daytime running lamp and position lamp integrated lamp is as follows:
when the daytime running lamp or the position lamp needs to be lightened, the corresponding control signal input end outputs a high-level signal to supply power for the control circuit of the automobile daytime running lamp and position lamp integrated lamp.
When the position lamp control signal input end outputs a high level signal, the first switch is conducted, and at the moment, the second switch is in a disconnected state because the second switch does not obtain a control signal of the daytime running lamp, so that the magnitude of current flowing through the lamp source is only determined by the resistance value of the first switch; when the input end of the daytime running lamp outputs a high level signal, the second switch is conducted under the control of the high level signal, and the high level signal output by the input end of the daytime running lamp is transmitted to the first switch through the unidirectional conducting circuit, so that the first switch is also in a conducting state, and the current flowing through the lamp source is determined by the resistance value of the whole switch circuit. Because the switch circuit is formed by connecting the first switch and the second switch in parallel, the resistance value of the switch circuit is smaller than the resistance value of the first switch circuit, when the daytime running lamp is started, the current flowing through the lamp source is larger than the current when the position lamp is started, and the requirements of the position lamp, the daytime running lamp and the like on different luminous intensities of the light source are met.
When any one light source has an open circuit fault, the fault detection circuit corresponding to the light source sends a control signal to the fault control circuit, and the fault control circuit closes all the first switches and the second switches in the light source group, so that all the light sources are closed, and the function that all the other light sources stop working after one light source is opened is realized.
Specifically, the first switch circuit is composed of a first triode, a first resistor, a second resistor and a third resistor, the base of the first triode is connected with the input end of the position lamp control signal through a series circuit composed of the first resistor and the second resistor, the emitter of the first triode is grounded through the third resistor, and the collector of the first triode is connected with the corresponding lamp source; the junction of the first resistor and the second resistor is grounded through a double diode connected in series.
The second switch circuit is composed of a second triode, a fourth resistor, a fifth resistor and a sixth resistor, the base electrode of the second triode is connected with the control signal input end of the daytime running lamp through a series circuit composed of the fourth resistor and the fifth resistor, the emitting electrode of the second triode is grounded through the sixth resistor, and the collector electrode of the second triode is connected with the corresponding lamp source; the junction of the third resistor and the fourth resistor is grounded through a double diode connected in series.
The first resistor, the second resistor and the double diodes connected in series provide base voltage for the first triode, and when the input end of the position lamp control signal outputs a high level signal, the base voltage of the first triode is high; and then make first triode switch on, there is the electric current in the light source that corresponds to flow to ground end through first triode, and the light source is luminous. The working principle of the second switch circuit is the same as that of the first switch circuit, and the description is omitted here.
Furthermore, a fault detection circuit in the feedback circuit is composed of a third triode, a first diode, a seventh resistor and an eighth resistor, and a fault control circuit is composed of a fourth triode and a fifth triode; the connection point of the lamp source and the switch circuit is connected with the base electrode of a third triode through a seventh resistor, the collector electrode of the third triode is connected with the position lamp control signal input end through an eighth resistor, and the emitting electrode of the third triode is respectively connected with the base electrodes of a fourth triode and a fifth triode; the emitter of the fourth triode is grounded, and the collector of the fourth triode is connected with the base of the first triode; the emitter of the fifth triode is grounded, and the collector of the fifth triode is connected with the base of the second triode.
In the working process of the light source, if a certain light source has an open circuit fault, the base electrode of a third triode connected with the light source is at a low level, the third triode is in a disconnected state at the moment, the current originally flowing through the third triode is interrupted, and under the action of a high level control signal of a daytime running lamp or a position lamp, the base electrode voltage of a fourth triode and a fifth triode is pulled high, so that the fourth triode and the fifth triode are connected, correspondingly, the base electrode voltage of the first triode and the second triode is pulled low, the first triode and the second triode are in a disconnected state, the current circulation paths of all the light sources are disconnected, and all the light sources are closed.
Furthermore, the input end of the position lamp control signal is grounded through a parallel circuit consisting of a first bidirectional transient voltage suppression diode and a first filter capacitor; the daytime running light control signal input end is grounded through a parallel circuit formed by a second bidirectional transient voltage suppression diode and a second filter capacitor. The bidirectional transient voltage suppression diode is mainly used for protecting a circuit when input voltage fluctuates, preventing transient overvoltage from damaging the circuit, and conducting when the transient voltage of an input end is higher than a certain voltage, so that the whole circuit is protected; the filter capacitor plays a role of filtering.
Furthermore, the daytime running light control signal input end is connected with the one-way conduction circuit through a double diode connected in parallel, and a joint of the double diode and the one-way conduction circuit is connected with the fourth resistor. The double diodes connected in parallel can prevent current from flowing backwards, so that the daytime running light control signal input end is protected.
Furthermore, the position lamp control signal input end is connected with the one-way conduction circuit through a second diode, and the conduction directions of the second diode and the one-way conduction circuit are opposite. The second diode can prevent current from flowing backwards, so that the position lamp control signal input end is protected.
The control circuit of the automobile daytime running lamp and position lamp integrated lamp is built by adopting discrete analog elements on the premise of meeting the requirements of corresponding regulations on the control circuit, the cost is low, the dangerous conditions possibly met by the control circuit in the working process are fully considered, the corresponding protection circuits such as a filter circuit, a transient voltage suppression circuit and the like are arranged, the position lamp circuit and the daytime running lamp circuit do not interfere with each other in the working process, and the reliability of the control circuit is improved.
Drawings
FIG. 1 is a schematic diagram of a control circuit for an automotive daytime running light and position light integrated light of the present invention.
Fig. 2 is a simplified circuit for operation of the position light (only the first light source is shown).
Fig. 3 is a simplified circuit for daytime running light operation (only the first light source is shown).
Detailed Description
The following describes embodiments of the present invention, such as shapes and structures of respective members, mutual positions and connection relationships between respective portions, and actions and operation principles of the respective portions, in further detail, with reference to the accompanying drawings.
Example 1:
as shown in fig. 1, the control circuit of the vehicle daytime running lamp and position lamp integrated lamp of this embodiment includes a daytime running lamp control signal input terminal DRL, a position lamp control signal input terminal TAIL, and a lamp source group formed by connecting three lamp sources in parallel, and each lamp source has three LED bulbs connected in series (the three lamp sources are LED 1-LED 3, LED 4-LED 6, and LED 7-LED 9, respectively); the daytime running lamp control signal input end DRL is connected with the position lamp control signal input end TAIL through a parallel double diode formed by connecting diodes D1 and D2 in parallel and a one-way conduction circuit, in the embodiment, the one-way conduction circuit is formed by connecting diodes D3 and D4 in parallel, and the conduction directions of the diodes D1, D2, D3 and D4 are all from the daytime running lamp control signal input end DRL to the position lamp control signal input end TAIL.
The position lamp control signal input terminal TAIL is connected with the unidirectional conducting circuit through a second diode D5, and the conducting direction of the second diode is opposite to that of the unidirectional conducting circuit. The second diode D5 prevents the reverse flow of current, thereby protecting the position lamp control signal input terminal TAIL.
The position lamp control signal input terminal TAIL is grounded through a parallel circuit consisting of a first bidirectional transient voltage suppression diode T1 and a first filter capacitor C1; the daytime running lamp control signal input end DRL is grounded through a parallel circuit consisting of a second bidirectional transient voltage suppression diode T2 and a second filter capacitor C2. The bidirectional transient voltage suppression diodes T1 and T2 mainly protect the circuit when the input voltage fluctuates, prevent the transient overvoltage from damaging the circuit, and conduct when the transient voltage of the input end is higher than a certain voltage, so that the whole circuit is protected; the filter capacitors C1 and C2 play a role in filtering.
Each lamp source corresponds to one switch circuit; one end of each lamp source in the lamp source group is connected with a position lamp control signal input end TAIL, the other end of each lamp source in the lamp source group is grounded through a switch circuit, and the switch circuit is formed by connecting a first switch and a second switch in parallel; the position lamp control signal input end TAIL is connected with the control end of the first switch to control whether the first switch is conducted or not; the daytime running lamp control signal input end DRL is connected with the control end of the second switch so as to control whether the second switch is conducted or not; the control circuit of the automobile daytime running lamp and position lamp integrated lamp further comprises a feedback circuit, the feedback circuit is composed of fault detection circuits and fault control circuits, the number of the fault detection circuits corresponds to the number of the lamp sources, the fault detection circuits detect whether the corresponding lamp sources have open circuit faults or not, and send control signals to the fault control circuits after the open circuit faults occur, and the fault control circuits close all the first switches and the second switches in the lamp source groups; the priority of the fault control circuit on the control of the first switch is greater than that of the position lamp control signal input end TAIL on the control of the first switch, and the priority of the fault control circuit on the control of the second switch is greater than that of the daytime running lamp control signal input end DRL on the control of the second switch.
Taking the first light source composed of the LEDs 1-3 as an example, the corresponding first switch circuit is composed of a first triode Q1, a first resistor R1, a second resistor R2 and a third resistor R3, the base of the first triode Q1 is connected with the position light control signal input terminal TAIL through a series circuit composed of the first resistor R1 and the second resistor R2, the emitter of the first triode Q1 is grounded through the third resistor R3, and the collector of the first triode Q1 is connected with the corresponding light source (i.e., the LED 3); the junction of the first resistor R1 and the second resistor R2 is grounded through a double diode Z1 connected in series.
The second switch circuit corresponding to the lamp source formed by the LEDs 1-3 is formed by a second triode Q2, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6, the base of the second triode Q2 is connected with the connection point of the unidirectional conducting circuit and the parallel double diodes D1 and D2 through a series circuit formed by the fourth resistor R4 and the fifth resistor R5, the emitter of the second triode Q2 is grounded through the sixth resistor R6, and the collector of the second triode Q2 is connected with the corresponding lamp source (namely, the LED 3); the junction of the third resistor R3 and the fourth resistor R4 is grounded through a double diode Z2 connected in series.
The first resistor R1, the second resistor R2 and the serially connected double diode Z1 provide base voltage for the first triode Q1, and when the position lamp control signal input terminal TAIL outputs a high level signal, the base voltage of the first triode Q1 is high; and then the first triode Q1 is turned on, and current in the corresponding light source flows to the ground end through the first triode Q1, so that the light source emits light. The working principle of the second switch circuit is the same as that of the first switch circuit, and the description is omitted here.
The fault detection circuit in the feedback circuit is composed of a third triode Q3, a first diode D6, a seventh resistor R7 and an eighth resistor R8, and the fault control circuit is composed of a fourth triode Q4 and a fifth triode Q5; the junction of the lamp source and the switch circuit is connected with the base electrode of a third triode Q3 through a seventh resistor R7, the collector electrode of the third triode Q3 is connected with the position lamp control signal input end TAIL through an eighth resistor R8, and the emitter electrode of the third triode Q3 is respectively connected with the base electrodes of a fourth triode Q4 and a fifth triode Q5; the emitter of the fourth triode Q4 is grounded, and the collector of the fourth triode Q4 is connected with the base of the first triode Q1; the emitter of the fifth triode Q5 is grounded, and the collector is connected to the base of the second triode Q2.
In the working process of the light source, if a certain light source has an open circuit fault, the base of the third triode Q3 connected with the light source is at a low level, at this time, the third triode Q3 is in an off state, the current originally flowing through the third triode Q3 is interrupted, and under the action of a high level control signal of the daytime running lamp or the position lamp, the base voltages of the fourth triode Q4 and the fifth triode Q5 are pulled high, so that the fourth triode Q4 and the fifth triode Q5 are conducted, accordingly, the base voltages of the first triode Q1 and the second triode Q2 are pulled low, the first triode Q1 and the second triode Q2 are in an off state, so that the current flow paths of all the light sources are disconnected, and all the light sources are closed.
The working principle of the control circuit of the automobile daytime running lamp and position lamp integrated lamp is as follows:
when the daytime running lamp or the position lamp needs to be lightened, the corresponding control signal input end outputs a high-level signal to supply power for the control circuit of the automobile daytime running lamp and position lamp integrated lamp.
When the position lamp control signal input terminal TAIL outputs a high level signal, the first switch is switched on, and at the moment, the second switch is in a disconnected state because the control signal of the daytime running lamp is not obtained, so that the magnitude of the current flowing through the lamp source is only determined by the resistance value of the first switch; when the input end of the daytime running lamp outputs a high level signal, the second switch is conducted under the control of the high level signal, and the high level signal output by the input end of the daytime running lamp is transmitted to the first switch through the unidirectional conducting circuit, so that the first switch is also in a conducting state, and the current flowing through the lamp source is determined by the resistance value of the whole switch circuit. Because the switch circuit is formed by connecting the first switch and the second switch in parallel, the resistance value of the switch circuit is smaller than the resistance value of the first switch circuit, when the daytime running lamp is started, the current flowing through the lamp source is larger than the current when the position lamp is started, and the requirements of the position lamp, the daytime running lamp and the like on different luminous intensities of the light source are met.
When any one light source has an open circuit fault, the fault detection circuit corresponding to the light source sends a control signal to the fault control circuit, and the fault control circuit closes all the first switches and the second switches in the light source group, so that all the light sources are closed, and the function that all the other light sources stop working after one light source is opened is realized.
Specifically, when the position light circuit is operated, the operating states of the 3-way LEDs are consistent, the output of the whole circuit is equivalent to the parallel connection of the 3-way LEDs, and the circuit can be simplified to fig. 2 (only the first light source LEDs 1 to LED3 are taken as examples). The operating states of the first transistor Q1, the third transistor Q3, and the fourth transistor Q4 determine the state of the overall circuit. Since the voltage across the dual diode Z2 is 1.4V, and the voltage of the emitter of the first transistor Q1 is the voltage after the LED3, which is about 5V, the first transistor Q1 is in a conducting state, and the street lamp source operates normally. The base voltage of the third triode Q3 is greater than the PN junction start voltage, and the base current ib is calculated to be 6uA, and according to the current amplification effect of the triodes, the third triode Q3 is in the saturation region, and at this time, the collector and the emitter of the third triode Q3 are equivalent to short circuit, so that the voltage at the upper end of the first diode D6 is pulled down, and the fourth triode Q4 is kept in the off state.
When any one of the LEDs 1-3 has an open circuit fault, the base of the third triode Q3 is open and is in a cut-off region, the current passes through the eighth resistor R8 and the first diode D6, the base voltage of the fourth triode Q4 is no longer low, because the collector of the fourth triode Q4 is connected with the base of the first triode Q1, the voltages of the two are equal, the base voltage of the first triode Q1 is calculated to be smaller than the base voltage of the fourth triode Q4, the fourth triode Q4 is in a saturated conduction state, the collector voltage of the fourth triode Q4 is zero, meanwhile, the collector voltage of the first triode Q1 is also zero, similarly, the base voltages of the first triodes corresponding to other circuits are also 0, all the first triodes are cut off, that is the first switch circuit is disconnected, and all the lamp sources stop working.
The working condition of the circuit when the daytime running lamp works is as follows:
when the daytime running lamp control signal input end DRL outputs a high-level control signal, the high-level control signal is divided into two paths, one path controls the conduction of the second switch circuit, the other path is connected with the position lamp circuit to enable the conduction of the first switch circuit, and the working current of the lamp source is the superposition of the two paths of current, so that the daytime running lamp is brighter when working than the position lamp. The fault feedback of the daytime running lamp during working is similar to that of a position lamp, and is realized by changing a cut-off state of the fourth triode Q4 and the fifth triode Q5 into a saturation state at the same time and pulling down the base voltages of the first triode Q1 and the second triode Q2, so that all lamp sources stop working.
In the drawings of the present invention, corresponding elements are labeled with the same reference numerals for easy identification, for example, all the first transistors are labeled with Q1, all the second transistors are labeled with Q2, and the like.
In order to improve the filtering effect, the junction between the first resistor R1 and the second resistor R2 is grounded through a capacitor C3, and the junction between the first resistor R3 and the second resistor R4 is grounded through a capacitor C4.

Claims (4)

1. A control circuit of an automobile daytime running lamp and position lamp integrated lamp comprises a daytime running lamp control signal input end, a position lamp control signal input end and a lamp source group formed by connecting at least two lamp sources in parallel, wherein each lamp source is provided with a bulb or a plurality of serially connected bulbs; the daytime running light control signal input end is connected with the position light control signal input end through a one-way conduction circuit; each lamp source corresponds to one switch circuit; one end of each lamp source in the lamp source group is connected with the position lamp control signal input end, the other end of each lamp source in the lamp source group is grounded through a switch circuit, and the switch circuit is formed by connecting a first switch and a second switch in parallel; the position lamp control signal input end is connected with the control end of the first switch to control whether the first switch is conducted or not; the daytime running light control signal input end is connected with the control end of the second switch to control whether the second switch is conducted or not; the control circuit of the automobile daytime running lamp and position lamp integrated lamp further comprises a feedback circuit, the feedback circuit is composed of fault detection circuits and fault control circuits, the number of the fault detection circuits corresponds to the number of the lamp sources, the fault detection circuits detect whether the corresponding lamp sources have open circuit faults or not, and send control signals to the fault control circuits after the open circuit faults occur, and the fault control circuits close all the first switches and the second switches in the lamp source groups; the priority of the fault control circuit for controlling the first switch is greater than the priority of the position lamp control signal input end for controlling the first switch, and the priority of the fault control circuit for controlling the second switch is greater than the priority of the daytime running lamp control signal input end for controlling the second switch; the first switch is composed of a first triode, a first resistor, a second resistor and a third resistor, the base electrode of the first triode is connected with the input end of the position lamp control signal through a series circuit composed of the first resistor and the second resistor, the emitting electrode of the first triode is grounded through the third resistor, and the collecting electrode of the first triode is connected with the corresponding lamp source; the joint of the first resistor and the second resistor is grounded through a double diode connected in series; the second switch is composed of a second triode, a fourth resistor, a fifth resistor and a sixth resistor, the base electrode of the second triode is connected with the control signal input end of the daytime running lamp through a series circuit composed of the fourth resistor and the fifth resistor, the emitting electrode of the second triode is grounded through the sixth resistor, and the collector electrode of the second triode is connected with the corresponding lamp source; the junction of the third resistor and the fourth resistor is grounded through a double diode connected in series; the fault detection circuit in the feedback circuit is composed of a third triode, a first diode, a seventh resistor and an eighth resistor, and the fault control circuit is composed of a fourth triode and a fifth triode; the connection point of the lamp source and the switch circuit is connected with the base electrode of a third triode through a seventh resistor, the collector electrode of the third triode is connected with the position lamp control signal input end through an eighth resistor, and the emitting electrode of the third triode is respectively connected with the base electrodes of a fourth triode and a fifth triode; the emitter of the fourth triode is grounded, and the collector of the fourth triode is connected with the base of the first triode; the emitter of the fifth triode is grounded, and the collector of the fifth triode is connected with the base of the second triode.
2. The control circuit of the automobile daytime running lamp and position lamp integrated lamp according to claim 1, wherein the position lamp control signal input end is grounded through a parallel circuit consisting of a first bidirectional transient voltage suppression diode and a first filter capacitor; the daytime running light control signal input end is grounded through a parallel circuit formed by a second bidirectional transient voltage suppression diode and a second filter capacitor.
3. The control circuit of the vehicle daytime running lamp and position lamp integrated lamp according to claim 1, wherein the daytime running lamp control signal input end is connected with the unidirectional conducting circuit through a double diode connected in parallel, and a junction of the double diode and the unidirectional conducting circuit is connected with a fourth resistor.
4. The control circuit of the automobile daytime running lamp and position lamp integrated lamp according to claim 1, wherein the position lamp control signal input end is connected with the one-way conduction circuit through a second diode, and the conduction direction of the second diode is opposite to that of the one-way conduction circuit.
CN201710612253.8A 2017-07-25 2017-07-25 Control circuit of automobile daytime running lamp and position lamp integrated lamp Active CN107512216B (en)

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