CN111741560A - Control circuit and car light - Google Patents

Control circuit and car light Download PDF

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Publication number
CN111741560A
CN111741560A CN202010743134.8A CN202010743134A CN111741560A CN 111741560 A CN111741560 A CN 111741560A CN 202010743134 A CN202010743134 A CN 202010743134A CN 111741560 A CN111741560 A CN 111741560A
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CN
China
Prior art keywords
proportional
circuit
resistor
inverse
voltage
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Pending
Application number
CN202010743134.8A
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Chinese (zh)
Inventor
杨姚佳
董世樑
夏盛
章利俊
沈建
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HASCO Vision Technology Co Ltd
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HASCO Vision Technology Co Ltd
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Application filed by HASCO Vision Technology Co Ltd filed Critical HASCO Vision Technology Co Ltd
Priority to CN202010743134.8A priority Critical patent/CN111741560A/en
Publication of CN111741560A publication Critical patent/CN111741560A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/56—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving measures to prevent abnormal temperature of the LEDs

Abstract

The invention relates to a control circuit and a vehicle lamp, comprising: comprises a main circuit and a proportional gear shifting circuit or an inverse gear shifting circuit; the proportional gear shifting module comprises a proportional gear shifting resistor; the proportional gear shifting circuit provides a first control voltage for the main circuit when the proportional gear shifting resistor works normally; when any one of short-circuit fault and open-circuit fault occurs to the proportional gear resistor, the proportional gear circuit provides a second control voltage for the main circuit; the first control voltage is greater than the second control voltage; the inverse ratio stepping module comprises an inverse ratio stepping resistor; when the inverse ratio gear shifting resistor works normally, the inverse ratio gear shifting circuit provides a third control voltage for the main circuit; when any one of short-circuit fault and open-circuit fault occurs in the inversely proportional gear shift resistor, the inversely proportional gear shift circuit provides fourth control voltage for the main circuit; the third control voltage is less than the fourth control voltage. The control circuit and the car lamp can ensure the safety of driving at night and give a driver fault warning.

Description

Control circuit and car light
Technical Field
The invention relates to the technical field of vehicle lamp control, in particular to a control circuit and a vehicle lamp.
Background
The car light includes LED lamp plate and the LDM (constant current control module for LED illumination and signal lamp) that the LED that controls on the LED lamp plate shows, can set up corresponding stepping resistance Rbin according to the power demand of LED on the LED lamp plate usually in order to be used for controlling the demonstration luminance gear of LED. When the LED is connected to the LDM, the LDM reads the voltage or current value of the stepping resistor Rbin on the LED lamp panel to determine the magnitude of the current output from the LDM to the LED lamp panel. Because the stepping resistor Rbin is installed on the LED lamp panel, and the detection circuit of the stepping resistor Rbin is located in the LDM, the stepping resistor Rbin and the LDM can work only by being connected through a connector and a wiring harness. However, in the vehicle body, the connector may have poor contact, and the wire harness may also have a short circuit to the ground, thereby causing a fault that the bin resistor Rbin is open or short-circuited to the ground.
The sensing and action types of the LDM for the gear shifting resistance Rbin include LDM with the gear shifting resistance Rbin being larger, the output power being larger, the gear shifting resistance Rbin being smaller, the output power being smaller, namely the size of the gear shifting resistance Rbin is in direct proportion to the output power, LDM with the gear shifting resistance Rbin being larger, LDM with the gear shifting resistance Rbin being smaller, the output power being smaller, the gear shifting resistance Rbin being smaller, the output power being larger, namely the size of the gear shifting resistance Rbin is in inverse proportion to the output power.
Therefore, for the LDM with the size of the bin resistor Rbin direct proportion to the output power, when the bin resistor Rbin is open, the LDM will overpower output, and thus the LED will burn out due to overheating, and when the bin resistor Rbin is short-circuited to the ground, the LDM will not output, and thus the LED will be extinguished. For the LDM with the size of the stepping resistor Rbin in inverse proportion to the output power, when the stepping resistor Rbin is in an open circuit, the LDM can cause no output, so that the LED is turned off; when the stepping resistor Rbin is short-circuited to the ground, the LDM can output over power, so that the LED is burnt out due to overheating. For night driving, the sudden turn-off of the lighting and signal lights can cause a great safety problem.
Disclosure of Invention
Therefore, it is necessary to provide a control circuit and a vehicle lamp for solving the problem in the conventional technology that the open circuit of the stepping resistor Rbin and the short circuit to ground cause the LED not to display and thus threaten the safety of the driver.
A control circuit comprises a main circuit and a proportional gear shifting circuit or an inverse gear shifting circuit connected with the main circuit; the main circuit is used for controlling the display brightness gear of the LED according to the control voltage provided by the proportional gear shifting circuit or the inverse gear shifting circuit;
the proportional gear shifting circuit comprises a proportional gear shifting module, and the proportional gear shifting module comprises a proportional gear shifting resistor; when the positive proportional tap resistance works normally, the positive proportional tap circuit provides a first control voltage for the main circuit; when any one of short-circuit fault and open-circuit fault occurs in the proportional gear resistor, the proportional gear circuit provides a second control voltage for the main circuit; the first control voltage is greater than the second control voltage;
the inverse ratio stepping circuit comprises an inverse ratio stepping module, and the inverse ratio stepping module comprises an inverse ratio stepping resistor; when the inverse proportional tap resistor works normally, the inverse proportional tap circuit provides a third control voltage for the main circuit; when any one of short-circuit fault and open-circuit fault occurs in the inversely proportional gear shifting resistor, the inversely proportional gear shifting circuit provides fourth control voltage for the main circuit; the third control voltage is less than the fourth control voltage.
In one embodiment, the positive fractional step circuit further comprises:
the proportional short-circuit protection module is connected with the proportional stepping resistor and the main circuit and is used for providing the second control voltage for the main circuit when the proportional stepping resistor has a short-circuit fault;
the direct proportion open circuit detection module is connected with the direct proportion stepping resistor and is used for detecting whether the direct proportion stepping resistor has open circuit fault or not, outputting a direct proportion working signal when the direct proportion stepping resistor does not have open circuit fault and outputting a direct proportion open circuit signal when the direct proportion stepping resistor has open circuit fault;
the proportional open-circuit protection module is used for providing the second control voltage;
a first electric connection end of the proportional selection module is connected with the proportional open-circuit protection module, a second electric connection end of the proportional selection module is connected with the main circuit, a third electric connection end of the proportional selection module is connected with the proportional stepping resistor, and a control end of the proportional selection module is connected with the proportional open-circuit detection module; when the control end of the proportional selection module receives the proportional working signal, the second electric connection end of the proportional selection module is connected with the third electric connection end of the proportional selection module, and the second electric connection end of the proportional selection module is disconnected with the first electric connection end of the proportional selection module; when the control end of the proportional selection module receives the proportional open-circuit signal, the second electric connection end of the proportional selection module is connected with the first electric connection end of the proportional selection module, and the second electric connection end of the proportional selection module is disconnected with the third electric connection end of the proportional selection module.
In one embodiment, the proportional stepping module further includes a proportional first voltage-dividing resistor, the proportional first voltage-dividing resistor and the proportional stepping resistor are sequentially connected in series between a power supply and a ground terminal, and a third electrical connection terminal of the proportional selection module is connected between the proportional first voltage-dividing resistor and the proportional stepping resistor.
In one embodiment, the proportional short-circuit protection module includes a proportional short-circuit protection resistor, the proportional short-circuit protection resistor is connected between the proportional first voltage-dividing resistor and the proportional stepping resistor, and the third electrical connection terminal of the proportional selection module is connected between the proportional first voltage-dividing resistor and the proportional short-circuit protection resistor.
In one embodiment, the proportional open circuit detection module includes a proportional operational amplifier and a proportional pull-up resistor, a unidirectional input terminal of the proportional operational amplifier is connected between the proportional stepping resistor and the proportional short circuit protection resistor, a proportional reference voltage is input to an inverted input terminal of the proportional operational amplifier, an output terminal of the proportional operational amplifier is connected to the power supply through the proportional pull-up resistor, and an output terminal of the proportional operational amplifier is further connected to the control terminal of the proportional selection module.
In one embodiment, the proportional open circuit protection module includes a proportional second voltage-dividing resistor, a proportional third voltage-dividing resistor, and a proportional fourth voltage-dividing resistor connected in series between the power supply and the ground in sequence, a sum of resistance values of the proportional second voltage-dividing resistor and the proportional third voltage-dividing resistor is equal to a resistance value of the proportional first voltage-dividing resistor, and a resistance value of the proportional fourth voltage-dividing resistor is equal to a resistance value of the proportional short circuit protection resistor.
In one embodiment, the inverse proportional binning circuit further comprises:
the inverse ratio open-circuit protection module is connected with the inverse ratio stepping resistor and the main circuit and is used for providing the fourth control voltage for the main circuit when the inverse ratio stepping resistor has an open-circuit fault;
the reverse ratio short circuit detection module is connected with the reverse ratio stepping resistor and is used for detecting whether the reverse ratio stepping resistor has short circuit fault or not, outputting a reverse ratio working signal when the reverse ratio stepping resistor does not have short circuit fault and outputting a reverse ratio short circuit signal when the reverse ratio stepping resistor has short circuit fault;
the inverse short-circuit protection module is used for providing the fourth control voltage;
a first electric connection end of the inverse proportion selection module is connected with the inverse proportion short-circuit protection module, a second electric connection end of the inverse proportion selection module is connected with the main circuit, a third electric connection end of the inverse proportion selection module is connected with the inverse proportion stepping resistor, and a control end of the inverse proportion selection module is connected with the inverse proportion short-circuit detection module; when the control end of the inverse proportion selection module receives the inverse proportion working signal, the second electric connection end of the inverse proportion selection module is connected with the third electric connection end of the inverse proportion selection module, and the second electric connection end of the inverse proportion selection module is disconnected with the first electric connection end of the inverse proportion selection module; when the control end of the inverse proportion selection module receives the inverse proportion short-circuit signal, the second electric connection end of the inverse proportion selection module is connected with the first electric connection end of the inverse proportion selection module, and the second electric connection end of the inverse proportion selection module is disconnected with the third electric connection end of the inverse proportion selection module.
In one embodiment, the inverse proportional stepping module further includes an inverse proportional first voltage-dividing resistor, the inverse proportional first voltage-dividing resistor and the inverse proportional stepping resistor are sequentially connected in series between the power source and the ground terminal, and the third electrical connection terminal of the inverse proportional selection module is connected between the inverse proportional first voltage-dividing resistor and the inverse proportional stepping resistor.
In one embodiment, the inverse proportional open circuit protection module includes an inverse proportional open circuit protection resistor connected in parallel across the inverse proportional tap resistor.
In one embodiment, the inverse proportional open circuit detection module comprises an inverse proportional operational amplifier and an inverse proportional pull-up resistor, an inverse directional input end of the inverse proportional operational amplifier is connected between the inverse proportional stepping resistor and the inverse proportional first voltage-dividing resistor, an output end of the inverse proportional operational amplifier is connected with the power supply through the inverse proportional pull-up resistor, and an output end of the inverse proportional operational amplifier is further connected with a control end of the inverse proportional selection module.
In one embodiment, the inverse short-circuit protection module includes an inverse proportional second voltage-dividing resistor, an inverse proportional third voltage-dividing resistor, and an inverse proportional fourth voltage-dividing resistor connected in series between the power supply and the ground in sequence, wherein a resistance value of the inverse proportional second voltage-dividing resistor is equal to a resistance value of the inverse proportional first voltage-dividing resistor, and a sum of resistance values of the inverse proportional third voltage-dividing resistor and the inverse proportional fourth voltage-dividing resistor is equal to a resistance value of the inverse proportional open-circuit protection resistor.
The utility model provides a car light, includes LED, LED lamp plate and as above arbitrary control circuit, LED and divide the gear resistance all set up in on the LED lamp plate.
According to the control circuit and the vehicle lamp, when the output power of the LDM is in direct proportion to the size of the stepping resistance or when the output power of the LDM is in inverse proportion to the size of the stepping resistance, the stepping resistance can keep LED display and display brightness reduction when an open-circuit fault and a short-circuit fault occur, and therefore the driving safety at night can be guaranteed, and meanwhile fault warning can be given to a driver.
Drawings
Fig. 1 is a block diagram of a control circuit according to an embodiment.
Fig. 2 is a block diagram of a control circuit in another embodiment.
FIG. 3 is a circuit diagram of a control circuit according to an embodiment.
Fig. 4 is a circuit diagram of a control circuit in another embodiment.
Description of reference numerals:
100. a main circuit; 200. a proportional gear shifting circuit; 210. a proportional gear module; 220. a proportional short-circuit protection module; 230. a proportional open circuit detection module; 240. a proportional open circuit protection module; 250. a proportional selection module; 300. a main circuit; 400. an inverse ratio stepping circuit; 410. an inverse ratio gear module; 420. an inverse open circuit protection module; 430. an inverse short detection module; 440. an inverse short-circuit protection module; 450. an inverse ratio selection module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In the description of the present application, it is to be understood that the terms "center", "lateral", "upper", "lower", "left", "right", "vertical", "horizontal", "top", "bottom", "inner" and "outer" etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application. Further, when an element is referred to as being "formed on" another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present.
The application provides a can all can keep LED demonstration and reduce and show luminance when stepping position resistance short circuit fault takes place and open circuit fault to can also give the control circuit of driver trouble warning when guaranteeing night driving safety.
The control circuit comprises a main circuit and a proportional gear shifting circuit or an inverse gear shifting circuit connected with the main circuit. The main circuit is used for controlling the display brightness gear of the LED according to the control voltage provided by the proportional gear shifting circuit or the inverse gear shifting circuit.
The proportional gear shifting circuit comprises a proportional gear shifting module, and the proportional gear shifting module comprises a proportional gear shifting resistor; the proportional gear shifting circuit provides a first control voltage for the main circuit when the proportional gear shifting resistor works normally; when any one of short-circuit fault and open-circuit fault occurs to the proportional gear resistor, the proportional gear circuit provides a second control voltage for the main circuit; the first control voltage is greater than the second control voltage.
The inverse ratio gear circuit comprises an inverse ratio gear module, and the inverse ratio gear module comprises an inverse ratio gear resistor; when the inverse ratio gear shifting resistor works normally, the inverse ratio gear shifting circuit provides a third control voltage for the main circuit; when any one of short-circuit fault and open-circuit fault occurs in the inversely proportional gear shift resistor, the inversely proportional gear shift circuit provides fourth control voltage for the main circuit; the third control voltage is less than the fourth control voltage.
Specifically, the main circuit can be located LDM, belongs to the part circuit of controlling the LED on the LED lamp plate among the LDM, and direct ratio stepping resistance, inverse ratio stepping resistance and LED are located on the LED lamp plate. As shown in fig. 1, when the output power of the LDM is proportional to the magnitude of the shift register resistance, the control circuit includes a main circuit 100 and a proportional shift register circuit 200 connected to the main circuit 100. The main circuit 100 is used for controlling the display brightness level of the LED according to the control voltage provided by the proportional gear shifting circuit 200, and the display brightness of the LED is brighter as the output power of the main circuit 100 is larger when the control voltage provided by the proportional gear shifting circuit 200 is larger. The proportional binning circuit 200 includes a proportional binning module 210, and the proportional binning module 210 includes a proportional binning resistor (not shown in fig. 1). When the proportional gear shifting resistor works normally, the proportional gear shifting circuit 200 provides a first control voltage for the main circuit 100, and the main circuit 100 controls the display brightness gear of the LED according to the first control voltage; when any one of the short-circuit fault and the open-circuit fault occurs to the proportional gear shift resistor, the proportional gear shift circuit 200 provides a second control voltage to the main circuit 100, and the main circuit 100 controls the display brightness gear of the LED according to the second control voltage. Since the second control voltage is smaller than the first control voltage, the main circuit 100 can still keep the LED displaying when any one of the short-circuit fault and the open-circuit fault occurs to the proportional stepping resistor, the display brightness is reduced compared with that when the proportional stepping resistor normally works, and the output power of the main circuit 100 is consistent when the short-circuit fault occurs to the proportional stepping resistor and when the open-circuit fault occurs to the proportional stepping resistor, so that the display brightness of the LED is also the same.
As shown in fig. 2, when the output power of the LDM is inversely proportional to the magnitude of the tap resistance, the control circuit includes a main circuit 300 and an inversely proportional tap circuit 400 connected to the main circuit 300. The main circuit 300 is used for controlling the display brightness level of the LED according to the control voltage provided by the inverse gear circuit 400, and the display brightness of the LED is darker as the output power of the main circuit 300 is smaller as the control voltage provided by the inverse gear circuit 400 is larger. The inverse ratio binning circuit 400 includes an inverse ratio binning module 410, and the inverse ratio binning module 410 includes an inverse ratio binning resistor (not shown in fig. 2). When the inversely proportional shift resistor works normally, the inversely proportional shift circuit 400 provides a third control voltage for the main circuit 300, and the main circuit 300 controls the display brightness shift of the LED according to the third control voltage; when any one of the short-circuit fault and the open-circuit fault occurs in the inversely proportional shift resistor, the inversely proportional shift circuit 400 provides a fourth control voltage to the main circuit 300, and the main circuit 300 controls the display brightness shift of the LED according to the fourth control voltage. Since the fourth control voltage is greater than the third control voltage, the main circuit 300 can still keep the LED displaying when any one of the short-circuit fault and the open-circuit fault occurs to the inversely proportional stepped resistor, the display brightness is reduced compared to when the inversely proportional stepped resistor normally operates, and the output power of the main circuit 300 is consistent when the inversely proportional stepped resistor has the short-circuit fault and the open-circuit fault, so that the display brightness of the LED is also the same.
When the output power of the LDM is in direct proportion to the size of the stepping resistance or when the output power of the LDM is in inverse proportion to the size of the stepping resistance, the control circuit can keep the LED display and reduce the display brightness when the stepping resistance has open circuit fault and short circuit fault, thereby ensuring the driving safety at night and giving fault warning to a driver.
Fig. 3 is a circuit diagram of a control circuit in an embodiment. As shown in fig. 3, the control circuit includes a main circuit 100 and a proportional gear shifting circuit 200. The proportional gear shifting circuit 200 includes a proportional gear shifting module 210, a proportional short-circuit protection module 220, a proportional open-circuit detection module 230, a proportional open-circuit protection module 240, and a proportional selection module 250. The proportional binning module 210 includes a proportional binning resistor Rbin 2.
The proportional short-circuit protection module 220 is connected to the proportional tap resistor Rbin2 and the main circuit 100. The proportional short-circuit protection module 220 is configured to detect whether the positive proportional gear shift resistor Rbin2 has a short-circuit fault, and provide a second control voltage to the main circuit 100 when the positive proportional gear shift resistor Rbin2 has a short-circuit fault. The second control voltage may correspond to a voltage corresponding to a rated minimum output gear of the main circuit 100, so that when the proportional tap resistor Rbin2 has a short-circuit fault, the output current of the main circuit 100 is a rated minimum current, thereby controlling the LED display brightness to be at the minimum gear.
The proportional open circuit detection module 230 is connected to the proportional bin resistor Rbin 2. The proportional open circuit detection module 230 is configured to detect whether the proportional bin resistor Rbin2 has an open circuit fault, output a proportional operating signal when the proportional bin resistor Rbin2 has no open circuit fault, and output a proportional open circuit signal when the proportional bin resistor Rbin2 has an open circuit fault. For example, the proportional open circuit detection module 230 may determine whether the proportional tap resistor Rbin2 has an open circuit fault by detecting a voltage across the proportional tap resistor Rbin2, output a low level signal as the proportional operating signal when the proportional tap resistor Rbin2 has no open circuit fault, and output a high level signal as the proportional open circuit signal when the proportional tap resistor Rbin2 has an open circuit fault.
The proportional open circuit protection module 240 is configured to provide a second control voltage, that is, the control voltage provided by the proportional open circuit protection module 240 is the same as the control voltage provided by the proportional short circuit protection module 220 when the proportional bin resistor Rbin2 has a short circuit fault, so that the display brightness of the LED is the same when the proportional bin resistor Rbin2 has a short circuit fault and when the proportional bin resistor Rbin2 has an open circuit fault.
The proportional selection module 250 comprises a first electrical connection terminal X21, a second electrical connection terminal X22, a third electrical connection terminal X23 and a control terminal X24. The first electrical connection terminal X21 of the proportional selection module 250 is connected to the proportional open-circuit protection module 240, the second electrical connection terminal X22 of the proportional selection module 250 is connected to the main circuit 100, the third electrical connection terminal X23 of the proportional selection module 250 is connected to the proportional shift resistor Rbin2, and the control terminal X24 of the proportional selection module 250 is connected to the proportional open-circuit detection module 230. When the control terminal X24 of the proportional selection module 250 receives the proportional operating signal, the second electrical connection terminal X22 of the proportional selection module 250 is connected to the third electrical connection terminal X23 of the proportional selection module 250, and the second electrical connection terminal X22 of the proportional selection module 250 is disconnected from the first electrical connection terminal X21 of the proportional selection module 250, if the proportional tap resistor Rbin2 does not have a short-circuit fault, the proportional tap circuit 200 provides the first control voltage to the main circuit 100, and if the proportional tap resistor Rbin2 has a short-circuit fault, the proportional tap circuit 200 provides the second control voltage to the main circuit 100 due to the function of the proportional short-circuit protection module 220. When the control terminal X24 of the proportional selection module 250 receives the proportional open signal, the second electrical connection terminal X22 of the proportional selection module 250 is electrically connected to the first electrical connection terminal X21 of the proportional selection module 250, and the second electrical connection terminal X22 of the proportional selection module 250 is electrically disconnected from the third electrical connection terminal X23 of the proportional selection module 250, so that the open protection module 240 provides the second control voltage to the main circuit 100.
Illustratively, the proportional binning module 210 includes a proportional first voltage-dividing resistor R21 and a proportional binning resistor Rbin2 connected in series between the power supply and ground. The third electrical connection X23 of the proportional selection module 250 is connected between the proportional first voltage-dividing resistor R21 and the proportional bin resistor Rbin 2.
Illustratively, the proportional short-circuit protection module 220 includes a proportional short-circuit protection resistor R22. The proportional short-circuit protection resistor R22 is connected between the proportional first voltage-dividing resistor R21 and the proportional stepping resistor Rbin2, and the third electrical connection terminal X23 of the proportional selection module 250 is connected between the proportional first voltage-dividing resistor R21 and the proportional short-circuit protection resistor R22.
When the proportional tap resistor Rbin2 is not short-circuited, the series equivalent resistor of the proportional short-circuit protection resistor R22 and the proportional tap resistor Rbin2 and the proportional first voltage-dividing resistor R21 divide the voltage, so that a first control voltage is output from a point a to the main circuit 100, and the main circuit 100 outputs a normal current according to the first control voltage to control the LED to display a normal brightness tap position. When a short-circuit fault occurs in the proportional stepping resistor Rbin2, the proportional short-circuit protection resistor R22 undertakes the work of the whole stepping resistor, so that the second control voltage is output to the main circuit 100 from the point A, the output power of the main circuit 100 is the output power of the gear corresponding to the proportional short-circuit protection resistor R22, and the requirements that the LED is not over-bright and is not closed are met. When the proportional stepping resistor Rbin2 returns to normal, the proportional stepping resistor Rbin2 is connected to the circuit again, the series resistance of the proportional short-circuit protection resistor R22 and the proportional stepping resistor Rbin2 returns to normal, the output of the main circuit 100 returns to normal, and therefore the display brightness of the LED is adjusted to the normal display brightness position again.
Optionally, the proportional short-circuit protection resistor R22 may be selected as a resistance value corresponding to a rated minimum output gear of the main circuit 100, and when the proportional gear shift resistor Rbin2 is short-circuited to ground, the output current of the main circuit 100 is the rated minimum current, which may meet the fail-safe requirement of the main circuit 100 in the whole application range.
Illustratively, the proportional selection module 250 may include any one of an analog path selector, an electronically controlled mechanical switch, a relay, a discrete MOS transistor, and a discrete triode. When the control terminal X24 of the proportional selection module 250 receives a low level, it is able to control the conduction between the second electrical connection terminal X22 and the third electrical connection terminal X23 of the proportional selection module 250 and the disconnection between the second electrical connection terminal X22 and the first electrical connection terminal X21 of the proportional selection module 250; when the control terminal X24 of the proportional selection module 250 receives a high level, it is possible to control the disconnection between the second electrical connection terminal X22 and the third electrical connection terminal X23 of the proportional selection module 250 and the conduction between the second electrical connection terminal X22 and the first electrical connection terminal X21 of the proportional selection module 250.
Illustratively, the proportional open circuit detection module 230 includes a proportional operational amplifier U21 and a proportional pull-up resistor R23. Proportional operational amplifier U21 and proportional pull-up resistor R23 may form a comparator. The same-direction input end of the proportional operational amplifier U21 is connected between the proportional stepping resistor Rbin2 and the proportional short-circuit protection resistor R22, the reverse input end of the proportional operational amplifier U21 inputs a proportional reference voltage Vth, the output end of the proportional operational amplifier U21 is connected with a power supply through a proportional pull-up resistor R23, and the output end of the proportional operational amplifier U21 is connected with the control end X24 of the proportional selection module 250.
Optionally, the proportional reference voltage Vth at the point C is slightly smaller than the power supply voltage, so as to ensure that the comparator can be reliably triggered when the positive proportional tap resistor Rbin2 has an open-circuit fault. When the proportional stepping resistor Rbin2 has no open-circuit fault, the voltage Vbin _ ext at the point B is smaller than the proportional reference voltage Vth at the point C, and the comparator outputs a low level to be used as a proportional working signal. After the control terminal X24 of the proportional selection module 250 receives the proportional operating signal, the second electrical connection terminal X22 of the proportional selection module 250 is connected to the third electrical connection terminal X23, and the second electrical connection terminal X22 of the proportional selection module 250 is disconnected from the first electrical connection terminal X21, so that the main circuit 100 is normally connected to the proportional stepping module 210, when the proportional stepping resistor Rbin2 does not have a short-circuit fault, the point a outputs a first control voltage to the main circuit 100, and when the proportional stepping resistor Rbin2 has a short-circuit fault, the point a outputs a second control voltage to the main circuit 100. When the proportional stepping resistor Rbin2 has an open-circuit fault, the voltage Vbin _ ext at the point B is greater than the proportional reference voltage Vth at the point C, and the comparator outputs a high level as a proportional open-circuit signal. After the control terminal X24 of the proportional selection module 250 receives the proportional open-circuit signal, the second electrical connection terminal X22 of the proportional selection module 250 is disconnected from the third electrical connection terminal X23, and the second electrical connection terminal X22 of the proportional selection module 250 is connected to the first electrical connection terminal X21, so that the main circuit 100 is disconnected from the proportional stepping module 210, the main circuit 100 is connected to the proportional open-circuit protection module 240, the proportional open-circuit protection module 240 outputs the second control voltage from the point D to the main circuit 100, and the LED display brightness decreases. After the open-circuit fault of the proportional stepping resistor Rbin2 is removed, the voltage Vbin _ ext at the point B is smaller than the proportional reference voltage Vth at the point C, the comparator outputs a low level to serve as a proportional working signal, the control voltage of the main circuit 100 is restored to the first control voltage, and the LED restores to the normal display brightness position.
Illustratively, the proportional open circuit protection module 240 includes a proportional second voltage divider resistor R24, a proportional third voltage divider resistor R25, and a proportional fourth voltage divider resistor R26 connected in series between the power supply and the ground. By adjusting the proportion of the resistance values of the proportional second voltage-dividing resistor R24 and the proportional third voltage-dividing resistor R25, the proportional reference voltage Vth can be slightly smaller than the power supply voltage VDD, so that the comparator is ensured to be reliably triggered when the positive-proportion tap resistor Rbin2 has an open-circuit fault. In this embodiment, the sum of the resistance values of the proportional second voltage-dividing resistor R24 and the proportional third voltage-dividing resistor R25 is equal to the resistance value of the proportional first voltage-dividing resistor R21, and the resistance value of the proportional fourth voltage-dividing resistor R26 is equal to the resistance value of the proportional short-circuit protection resistor R22, so that the voltage Vbin _ Failsafe at the point D is equal to the voltage at the point a when the proportional tap resistor Rbin2 has a short-circuit fault, and thus the proportional tap circuit 200 can provide the same control voltage, i.e., the second control voltage, to the main circuit 100 when the proportional tap resistor Rbin2 has a short-circuit fault and an open-circuit fault, and the display luminance steps of the LEDs are the same when the proportional tap resistor Rbin2 has a short-circuit fault and the open-circuit fault.
Fig. 4 is a circuit diagram of a control circuit in another embodiment. As shown in fig. 4, the control circuit includes a main circuit 300 and an inversely proportional shift position circuit 400. The inverse ratio step circuit 400 includes an inverse ratio step module 410, an inverse ratio open circuit protection module 420, an inverse ratio short detection module 430, an inverse ratio short protection module 440, and an inverse ratio selection module 450. The inverse ratio step module 410 includes an inverse ratio step resistor Rbin 4.
The inverse proportional open circuit protection module 420 is connected to the inverse proportional tap resistor Rbin4 and the main circuit 300. The inverse proportional open circuit protection module 420 is configured to detect whether the inverse proportional tap position resistor Rbin4 has an open circuit fault, and provide a fourth control voltage to the main circuit 300 when the inverse proportional tap position resistor Rbin4 has an open circuit fault. The fourth control voltage may correspond to a voltage corresponding to a rated minimum output gear of the main circuit 300, such that when an open-circuit fault occurs in the inverse ratio stepping resistor Rbin4, the output current of the main circuit 300 is a rated minimum current, thereby controlling the LED display brightness to be at the minimum gear.
The inverse short detection module 430 is coupled to an inverse stepping resistor Rbin 4. The inverse proportion stepping resistor Rbin4 is used for detecting whether a short-circuit fault occurs in the inverse proportion stepping resistor Rbin4, outputting an inverse proportion working signal when the inverse proportion stepping resistor Rbin4 does not have the short-circuit fault, and outputting an inverse proportion short-circuit signal when the inverse proportion stepping resistor Rbin4 has the short-circuit fault. For example, the inverse proportional short circuit detection module 430 may determine whether the inverse proportional shift resistor Rbin4 has a short circuit fault by detecting a voltage across the inverse proportional shift resistor Rbin4, output a low level signal as the inverse proportional operating signal when the inverse proportional shift resistor Rbin4 has no short circuit fault, and output a high level signal as the inverse proportional short circuit signal when the inverse proportional shift resistor Rbin4 has a short circuit fault.
The inverse short-circuit protection module 440 is configured to provide a fourth control voltage, that is, the control voltage provided by the inverse short-circuit protection module 440 is the same as the control voltage provided by the inverse open-circuit protection module 420 when the inverse discrete step resistor Rbin4 is in an open-circuit fault, so that the display brightness of the LED is the same when the inverse discrete step resistor Rbin4 is in an open-circuit fault and when the inverse discrete step resistor Rbin is in a short-circuit fault.
The inverse ratio selection module 450 comprises a first electrical connection terminal X41, a second electrical connection terminal X42, a third electrical connection terminal X43 and a control terminal X44. The first electrical connection terminal X41 of the inverse proportion selection module 450 is connected with the inverse proportion short-circuit protection module 440, the second electrical connection terminal X42 of the inverse proportion selection module 450 is connected with the main circuit 300, the third electrical connection terminal X43 of the inverse proportion selection module 450 is connected with the inverse proportion gear shift resistor Rbin4, and the control terminal X44 of the inverse proportion selection module 450 is connected with the inverse proportion short-circuit detection module 430. When the control terminal X44 of the inverse ratio selection module 450 receives the inverse ratio operation signal, the second electrical connection terminal X42 of the inverse ratio selection module 450 is electrically connected to the third electrical connection terminal X43 of the inverse ratio selection module 450, and the second electrical connection terminal X42 of the inverse ratio selection module 450 is electrically disconnected from the first electrical connection terminal X41 of the inverse ratio selection module 450, if the inverse ratio stepping resistor Rbin4 does not have an open-circuit fault, the point E outputs a third control voltage to the main circuit 300, and if the inverse ratio stepping resistor Rbin4 has an open-circuit fault, the point E outputs a fourth control voltage to the main circuit 300 due to the function of the inverse ratio open-circuit protection module 420. When the control terminal X44 of the inversely proportional selecting module 450 receives the inversely proportional short-circuit signal, the second electrical connection terminal X42 of the inversely proportional selecting module 450 is electrically connected to the first electrical connection terminal X41 of the inversely proportional selecting module 450, and the second electrical connection terminal X42 of the inversely proportional selecting module 450 is electrically disconnected from the third electrical connection terminal X43 of the inversely proportional selecting module 450, so that the short-circuit protection module 440 provides the fourth control voltage to the main circuit 300.
Illustratively, the inverse proportional binning module 410 includes an inverse proportional first voltage-dividing resistor R41 and an inverse proportional binning resistor Rbin4 connected in series between the power supply and ground in sequence. The third electrical connection X43 of the inverse proportional selection module 450 is connected between the inverse proportional first voltage dividing resistor R41 and the inverse proportional stepping resistor Rbin 4.
Illustratively, the inverse proportional open protection module 420 includes an inverse proportional open protection resistor R42. The inverse proportional open-circuit protection resistor R42 is connected in parallel with two ends of the inverse proportional stepping resistor Rbin 4.
When the inverse ratio stepping resistor Rbin4 has no open-circuit fault, the parallel equivalent resistor of the inverse ratio open-circuit protection resistor R42 and the inverse ratio stepping resistor Rbin4 and the inverse ratio first divider resistor R41 divide the voltage, so that a third control voltage is output from the point E to the main circuit 300, and the main circuit 300 outputs a normal current according to the third control voltage to control the LED to display a normal brightness gear. When an open-circuit fault occurs in the inverse ratio stepping resistor Rbin4, the inverse ratio open-circuit protection resistor R42 undertakes the work of the whole stepping resistor, so that a fourth control voltage is output to the main circuit 300 from the point E, and the output power of the main circuit 300 is the output power of the gear corresponding to the inverse ratio open-circuit protection resistor R42, thereby meeting the requirements that the LED is not over-bright and is not turned off. When the inverse ratio stepping resistor Rbin4 returns to normal, the inverse ratio stepping resistor Rbin4 is connected to the circuit again, the parallel resistance of the inverse ratio open-circuit protection resistor R42 and the inverse ratio stepping resistor Rbin4 returns to normal, the output of the main circuit 300 returns to normal, and therefore the display brightness of the LED is adjusted to the normal display brightness gear again.
Optionally, the inverse ratio open-circuit protection resistor R42 may be selected as a resistance value corresponding to a rated minimum output gear of the main circuit 300, and when the inverse ratio gear shift resistor Rbin4 is short-circuited to ground, the output current of the main circuit 300 is the rated minimum current, which may meet the fail-safe requirement of the main circuit 300 in the whole application range.
Illustratively, the inverse proportion selection module 450 may include any one of an analog path selector, an electrically controlled mechanical switch, a relay, a discrete MOS transistor, and a discrete triode. When the control terminal X44 of the inverse proportion selection module 450 receives a low level, it is able to control the conduction between the second electrical connection terminal X42 and the third electrical connection terminal X43 of the inverse proportion selection module 450 and the disconnection between the second electrical connection terminal X42 and the first electrical connection terminal X41 of the inverse proportion selection module 450; when the control terminal X44 of the inverse proportion selection module 450 receives a high level, it is able to control the disconnection between the second electrical connection terminal X42 and the third electrical connection terminal X43 of the inverse proportion selection module 450 and the conduction between the second electrical connection terminal X42 and the first electrical connection terminal X41 of the inverse proportion selection module 450.
Illustratively, the inversely proportional open circuit detection module 430 includes an inversely proportional operational amplifier U41 and an inversely proportional pull-up resistor R43. An inversely proportional operational amplifier U41 and an inversely proportional pull-up resistor R43 may constitute a comparator. An inverse ratio reference voltage Vth2 is input to an equidirectional input end of an inverse ratio operational amplifier U41, an inverse input end of the inverse ratio operational amplifier U41 is connected between an inverse ratio stepping resistor Rbin4 and an inverse ratio first voltage-dividing resistor R21, an output end of the inverse ratio operational amplifier U41 is connected with a power supply through an inverse ratio pull-up resistor R43, and an output end of the inverse ratio operational amplifier U41 is further connected with a control end X44 of the inverse ratio selection module 450.
Optionally, the inverse ratio reference voltage Vth2 at the point F is slightly larger than the voltage of the ground terminal, so that when the inverse ratio tap position resistor Rbin4 has a short-circuit fault, the comparator can be reliably triggered. When the short-circuit fault does not occur in the inverse proportional stepping resistor Rbin4, the voltage Vbin _ ext2 at the point E is greater than the inverse proportional reference voltage Vth2 at the point F, and the comparator outputs a low level as an inverse proportional operating signal. After the control terminal X44 of the inverse ratio selection module 450 receives the inverse ratio operation signal, the second electrical connection terminal X42 and the third electrical connection terminal X43 of the inverse ratio selection module 450 are turned on, and the second electrical connection terminal X42 and the first electrical connection terminal X41 of the inverse ratio selection module 450 are turned off, so that the main circuit 300 is normally connected to the inverse ratio stepping module 410, if the inverse ratio stepping resistor Rbin4 has no open-circuit fault, the point E outputs the third control voltage to the main circuit 300, and if the inverse ratio stepping resistor Rbin4 has an open-circuit fault, the point E outputs the fourth control voltage to the main circuit 300. When the short-circuit fault occurs in the inverse proportional stepping resistor Rbin4, the voltage Vbin _ ext2 at the point E is smaller than the inverse proportional reference voltage Vth2 at the point F, and the comparator outputs a high level as an inverse proportional short-circuit signal. After the control terminal X44 of the inverse proportion selection module 450 receives the inverse proportion short-circuit signal, the second electrical connection terminal X42 and the third electrical connection terminal X43 of the inverse proportion selection module 450 are disconnected, and the second electrical connection terminal X42 and the first electrical connection terminal X41 of the inverse proportion selection module 450 are connected, so that the main circuit 300 and the inverse proportion gear shift module 410 are disconnected, the main circuit 300 is connected with the inverse proportion short-circuit protection module 440, the inverse proportion short-circuit protection module 440 provides the fourth control voltage to the main circuit 300, and the LED display brightness is reduced. After the short-circuit fault of the inverse ratio shift resistor Rbin4 is removed, the voltage Vbin _ ext2 at the point E is greater than the inverse ratio reference voltage Vth2 at the point F, the comparator outputs a low level as an inverse ratio working signal, the control voltage of the main circuit 300 is restored to the third control voltage, and the LED restores to the normal display brightness position.
Illustratively, the inversely proportional short-circuit protection module 440 includes an inversely proportional second voltage-dividing resistor R44, an inversely proportional third voltage-dividing resistor R45, and an inversely proportional fourth voltage-dividing resistor R46, which are serially connected in sequence between the power supply and the ground. By adjusting the proportion of the sum of the resistance value of the inversely proportional fourth voltage-dividing resistor R46 and the resistance values of the inversely proportional second voltage-dividing resistor R44 and the inversely proportional third voltage-dividing resistor R45, the inversely proportional reference voltage Vth2 can be slightly larger than the voltage of the ground terminal, so that the comparator can be reliably triggered when the inversely proportional fourth voltage-dividing resistor Rbin4 has a short-circuit fault. The resistance value of the inversely proportional second voltage-dividing resistor R44 is equal to the resistance value of the inversely proportional first voltage-dividing resistor R41, the sum of the resistance values of the inversely proportional third voltage-dividing resistor R45 and the inversely proportional fourth voltage-dividing resistor R46 is equal to the resistance value of the inversely proportional open-circuit protection resistor R42, so that the voltage Vbin _ Failsafe2 at the point G is equal to the voltage at the point E when the inversely proportional tap resistor Rbin4 has an open-circuit fault, so that the inversely proportional tap circuit 400 can provide the same control voltage, i.e., the fourth control voltage, to the main circuit 300 when the inversely proportional tap resistor Rbin4 has an open-circuit fault and a short-circuit fault occurs, so that the display luminance steps of the LEDs are the same when the inversely proportional tap resistor Rbin4 has a short-circuit fault and the open.
The control circuit can control the LED not to be over-bright and not to be closed when the stepping resistor has open circuit fault and short circuit fault, the output power is the same under the two faults, namely the display brightness gear of the LED is controlled to be the same, and self-recovery can be carried out after the fault is removed, so that the display brightness gear of the LED is recovered to the normal gear again. Moreover, the control circuit is a common device, which is beneficial to reducing cost and can ensure the functional failure safety when the stepping resistors of most LEDs are open-circuited or short-circuited to the ground.
The application also provides a car light. The car light includes LED, LED lamp plate and as in any one of the above embodiments the control circuit. LED and stepping resistance all set up on the LED lamp plate.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (12)

1. A control circuit is characterized by comprising a main circuit and a proportional gear shifting circuit or an inverse gear shifting circuit connected with the main circuit; the main circuit is used for controlling the display brightness gear of the LED according to the control voltage provided by the proportional gear shifting circuit or the inverse gear shifting circuit;
the proportional gear shifting circuit comprises a proportional gear shifting module, and the proportional gear shifting module comprises a proportional gear shifting resistor; when the positive proportional tap resistance works normally, the positive proportional tap circuit provides a first control voltage for the main circuit; when any one of short-circuit fault and open-circuit fault occurs in the proportional gear resistor, the proportional gear circuit provides a second control voltage for the main circuit; the first control voltage is greater than the second control voltage;
the inverse ratio stepping circuit comprises an inverse ratio stepping module, and the inverse ratio stepping module comprises an inverse ratio stepping resistor; when the inverse proportional tap resistor works normally, the inverse proportional tap circuit provides a third control voltage for the main circuit; when any one of short-circuit fault and open-circuit fault occurs in the inversely proportional gear shifting resistor, the inversely proportional gear shifting circuit provides fourth control voltage for the main circuit; the third control voltage is less than the fourth control voltage.
2. The control circuit of claim 1, wherein the positive fractional step circuit further comprises:
the proportional short-circuit protection module is connected with the proportional stepping resistor and the main circuit and is used for providing the second control voltage for the main circuit when the proportional stepping resistor has a short-circuit fault;
the direct proportion open circuit detection module is connected with the direct proportion stepping resistor and is used for detecting whether the direct proportion stepping resistor has open circuit fault or not, outputting a direct proportion working signal when the direct proportion stepping resistor does not have open circuit fault and outputting a direct proportion open circuit signal when the direct proportion stepping resistor has open circuit fault;
the proportional open-circuit protection module is used for providing the second control voltage;
a first electric connection end of the proportional selection module is connected with the proportional open-circuit protection module, a second electric connection end of the proportional selection module is connected with the main circuit, a third electric connection end of the proportional selection module is connected with the proportional stepping resistor, and a control end of the proportional selection module is connected with the proportional open-circuit detection module; when the control end of the proportional selection module receives the proportional working signal, the second electric connection end of the proportional selection module is connected with the third electric connection end of the proportional selection module, and the second electric connection end of the proportional selection module is disconnected with the first electric connection end of the proportional selection module; when the control end of the proportional selection module receives the proportional open-circuit signal, the second electric connection end of the proportional selection module is connected with the first electric connection end of the proportional selection module, and the second electric connection end of the proportional selection module is disconnected with the third electric connection end of the proportional selection module.
3. The control circuit of claim 2, wherein the positive fractional binning module further comprises a proportional first voltage-dividing resistor, the proportional first voltage-dividing resistor and the proportional binning resistor are sequentially connected in series between a power supply and a ground terminal, and a third electrical connection terminal of the proportional selection module is connected between the proportional first voltage-dividing resistor and the proportional binning resistor.
4. The control circuit of claim 3, wherein the proportional short-circuit protection module comprises a proportional short-circuit protection resistor, the proportional short-circuit protection resistor is connected between the proportional first voltage-dividing resistor and the proportional stepping resistor, and the third electrical connection terminal of the proportional selection module is connected between the proportional first voltage-dividing resistor and the proportional short-circuit protection resistor.
5. The control circuit of claim 4, wherein the proportional open circuit detection module comprises a proportional operational amplifier and a proportional pull-up resistor, a unidirectional input terminal of the proportional operational amplifier is connected between the proportional stepping resistor and the proportional short circuit protection resistor, a proportional reference voltage is input to an inverting input terminal of the proportional operational amplifier, an output terminal of the proportional operational amplifier is connected to the power supply through the proportional pull-up resistor, and an output terminal of the proportional operational amplifier is further connected to the control terminal of the proportional selection module.
6. The control circuit of claim 5, wherein the proportional open circuit protection module comprises a proportional second voltage-dividing resistor, a proportional third voltage-dividing resistor and a proportional fourth voltage-dividing resistor connected in series between the power supply and the ground in sequence, a sum of resistance values of the proportional second voltage-dividing resistor and the proportional third voltage-dividing resistor is equal to a resistance value of the proportional first voltage-dividing resistor, and a resistance value of the proportional fourth voltage-dividing resistor is equal to a resistance value of the proportional short circuit protection resistor.
7. The control circuit of claim 1, wherein the inverse proportional binning circuit further comprises:
the inverse ratio open-circuit protection module is connected with the inverse ratio stepping resistor and the main circuit and is used for providing the fourth control voltage for the main circuit when the inverse ratio stepping resistor has an open-circuit fault;
the reverse ratio short circuit detection module is connected with the reverse ratio stepping resistor and is used for detecting whether the reverse ratio stepping resistor has short circuit fault or not, outputting a reverse ratio working signal when the reverse ratio stepping resistor does not have short circuit fault and outputting a reverse ratio short circuit signal when the reverse ratio stepping resistor has short circuit fault;
the inverse short-circuit protection module is used for providing the fourth control voltage;
a first electric connection end of the inverse proportion selection module is connected with the inverse proportion short-circuit protection module, a second electric connection end of the inverse proportion selection module is connected with the main circuit, a third electric connection end of the inverse proportion selection module is connected with the inverse proportion stepping resistor, and a control end of the inverse proportion selection module is connected with the inverse proportion short-circuit detection module; when the control end of the inverse proportion selection module receives the inverse proportion working signal, the second electric connection end of the inverse proportion selection module is connected with the third electric connection end of the inverse proportion selection module, and the second electric connection end of the inverse proportion selection module is disconnected with the first electric connection end of the inverse proportion selection module; when the control end of the inverse proportion selection module receives the inverse proportion short-circuit signal, the second electric connection end of the inverse proportion selection module is connected with the first electric connection end of the inverse proportion selection module, and the second electric connection end of the inverse proportion selection module is disconnected with the third electric connection end of the inverse proportion selection module.
8. The control circuit of claim 7, wherein the inverse proportional binning module further comprises an inverse proportional first voltage-dividing resistor, the inverse proportional first voltage-dividing resistor and the inverse proportional binning resistor being connected in series between the power source and the ground in turn, and a third electrical connection of the inverse proportional selection module being connected between the inverse proportional first voltage-dividing resistor and the inverse proportional binning resistor.
9. The control circuit of claim 8, wherein the inverse proportional open circuit protection module includes an inverse proportional open circuit protection resistor connected in parallel across the inverse proportional tap resistance.
10. The control circuit of claim 9, wherein the inverse proportional open circuit detection module comprises an inverse proportional operational amplifier and an inverse proportional pull-up resistor, a common input terminal of the inverse proportional operational amplifier inputs an inverse proportional reference voltage, an inverse input terminal of the inverse proportional operational amplifier is connected between the inverse proportional stepping resistor and the inverse proportional first voltage-dividing resistor, an output terminal of the inverse proportional operational amplifier is connected with the power supply through the inverse proportional pull-up resistor, and an output terminal of the inverse proportional operational amplifier is further connected with the control terminal of the inverse proportional selection module.
11. The control circuit of claim 10, wherein the inversely proportional short-circuit protection module comprises an inversely proportional second voltage-dividing resistor, an inversely proportional third voltage-dividing resistor, and an inversely proportional fourth voltage-dividing resistor connected in series between the power supply and the ground in this order, wherein a resistance value of the inversely proportional second voltage-dividing resistor is equal to a resistance value of the inversely proportional first voltage-dividing resistor, and a sum of resistance values of the inversely proportional third voltage-dividing resistor and the inversely proportional fourth voltage-dividing resistor is equal to a resistance value of the inversely proportional open-circuit protection resistor.
12. A car light, characterized in that, includes LED, LED lamp plate and according to any one of claims 1 to 9 the control circuit, LED and divide gear level resistance all set up in on the LED lamp plate.
CN202010743134.8A 2020-07-29 2020-07-29 Control circuit and car light Pending CN111741560A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010743134.8A CN111741560A (en) 2020-07-29 2020-07-29 Control circuit and car light

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010743134.8A CN111741560A (en) 2020-07-29 2020-07-29 Control circuit and car light

Publications (1)

Publication Number Publication Date
CN111741560A true CN111741560A (en) 2020-10-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010743134.8A Pending CN111741560A (en) 2020-07-29 2020-07-29 Control circuit and car light

Country Status (1)

Country Link
CN (1) CN111741560A (en)

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