CN108471656B - Light source driving circuit and lighting device - Google Patents
Light source driving circuit and lighting device Download PDFInfo
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- CN108471656B CN108471656B CN201810557218.5A CN201810557218A CN108471656B CN 108471656 B CN108471656 B CN 108471656B CN 201810557218 A CN201810557218 A CN 201810557218A CN 108471656 B CN108471656 B CN 108471656B
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- 238000010586 diagram Methods 0.000 description 4
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- 238000003745 diagnosis Methods 0.000 description 3
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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]
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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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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Abstract
The invention provides a light source driving circuit and a lighting device, and relates to the technical field of automobile lighting. The light source driving circuit comprises a DC/DC constant voltage module and a linear constant current module, wherein the DC/DC constant voltage module is electrically connected with a light source group, the DC/DC constant voltage module is electrically connected with an input power supply, the positive electrode of the linear constant current module is electrically connected with the light source group, and the negative electrode of the linear constant current module is grounded. The light source driving circuit and the lighting device provided by the invention have the advantages of improving the circuit conversion efficiency of the whole driving circuit, reducing the power consumption and heat consumed by driving, effectively reducing the area of a driving plate and the like.
Description
Technical Field
The invention relates to the technical field of automobile illumination, in particular to a light source driving circuit and an illumination device.
Background
With the rapid development of the automobile industry, the field of automobile accessories has also achieved remarkable progress, wherein the lighting device is used as an important accessory to be configured for each automobile, and the technical progress is particularly obvious.
The conventional driving circuit architecture of the automotive lighting device is divided into: the three major types of resistive, linear constant current and DC/DC constant current are adopted, and the driving framework of each LED function adopts a single type driving framework, namely a pure resistive type, a pure linear constant current type or a pure DC/DC constant current type. The problems of overlarge control panel, poor anti-interference capability, low working efficiency and the like easily occur in a single driving circuit.
In view of this, how to solve the above problems is an important point of attention of those skilled in the art.
Disclosure of Invention
The invention aims to provide a light source driving circuit which is used for solving the problems of overlarge control panel, poor anti-interference capability, low working efficiency and the like of an automobile lighting device driving circuit in the prior art.
Another objective of the present invention is to provide a lighting device, which solves the problems of the prior art that the control panel of the driving circuit of the automotive lighting device is too large, the anti-interference capability is poor, and the working efficiency is low.
The invention is realized in the following way:
in one aspect, an embodiment of the present invention provides a light source driving circuit, where the light source driving circuit includes a DC/DC constant voltage module and a linear constant current module, where the DC/DC constant voltage module is electrically connected to a light source group, and the DC/DC constant voltage module is electrically connected to an input power supply, an anode of the linear constant current module is electrically connected to the light source group, and a cathode of the linear constant current module is grounded.
Further, the light source driving circuit further comprises a fault detection module and a fault shut-off module, the output end of the light source group is electrically connected with the fault detection module, the fault detection module is electrically connected with the fault shut-off module, and the fault shut-off module is electrically connected with the DC/DC constant voltage module.
Further, the DC/DC constant voltage module includes a DC/DC chip, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, a first inductor, and a schottky diode, where a first port and a second port of the DC/DC chip are electrically connected to one end of the first resistor and the input power supply, the other end of the first resistor is electrically connected to the fault shutdown module, a third port of the DC/DC chip is electrically connected to the fault shutdown module, a fourth port of the DC/DC chip is electrically connected to the second resistor and then grounded, and the second resistor is also electrically connected to the fault shutdown module, a fifth port of the DC/DC chip is electrically connected to the third resistor, the fourth resistor, and one end of the first capacitor, another end of the third resistor is grounded, another end of the fourth resistor is electrically connected to one end of the first inductor, another end of the first resistor is electrically connected to the first inductor, a third port of the DC/DC chip is electrically connected to the second resistor, another end of the second resistor is electrically connected to the second resistor, another end of the schottky diode is electrically connected to the first end of the first resistor, another end of the second resistor is electrically grounded, and another end of the third resistor is electrically connected to the second resistor.
Further, the fault shutdown module comprises a first triode, a second triode, a third triode, a sixth resistor, a seventh resistor, an eighth resistor, a third capacitor and a fourth capacitor, wherein the base electrode of the first triode is respectively and electrically connected with one end of the fault detection module and one end of the third capacitor, the other end of the third capacitor is grounded, the collector electrode of the first triode is grounded, the emitter electrode of the first triode is respectively and electrically connected with the base electrode of the second triode and one end of the sixth resistor, the other end of the sixth resistor is electrically connected with an input power supply, one end of the fourth capacitor is electrically connected with the base electrode of the second triode, the other end of the fourth capacitor is grounded, the emitter electrode of the second triode is respectively and electrically connected with one end of the eighth resistor and the third triode, the other end of the eighth resistor is electrically connected with the input power supply, the other end of the third triode is grounded, and the collector electrode of the third triode is respectively connected with the DC chip.
Further, the linear constant current module comprises a fourth triode, a fifth triode, a ninth resistor and a tenth resistor, wherein a collector of the fourth triode is electrically connected with the light source group, an emitter of the fourth triode is electrically connected with a base of the fifth triode and the ninth resistor respectively, the ninth resistor is grounded, a base of the fourth triode is electrically connected with the collector of the fifth triode and one end of the tenth resistor respectively, the other end of the tenth resistor is electrically connected with an output end of the DC/DC constant voltage module, and the emitter of the fifth triode is grounded.
Further, the light source driving circuit further comprises an input filter module, wherein the input filter module is electrically connected with the DC/DC constant voltage module, and the input filter module is used for being electrically connected with the input power supply.
Further, the input filter module includes a second inductor, a fifth capacitor, a sixth capacitor, a seventh capacitor and an eighth capacitor, where a first end of the second inductor is electrically connected to the input power supply, a second end of the second inductor is point-connected to the DC/DC constant voltage module, the fifth capacitor is serially connected to the sixth capacitor, one end of the fifth capacitor is electrically connected to the first end of the second inductor, the sixth capacitor is grounded, one end of the seventh capacitor is electrically connected to the first end of the second inductor, the other end of the seventh capacitor is grounded, one end of the eighth capacitor is electrically connected to the second end of the second inductor, and the other end of the eighth capacitor is grounded.
Further, the light source driving circuit further comprises an anti-reverse connection module, the input end of the anti-reverse connection module is electrically connected with the input filter module, and the output end of the anti-reverse connection module is electrically connected with the DC/DC constant voltage module.
In a second aspect, an embodiment of the present invention further provides a lighting device, where the lighting device includes a light source group and a light source driving circuit, a DC/DC constant voltage module of the light source driving circuit is electrically connected to an input end of the light source group, and a linear constant current module of the light source driving circuit is electrically connected to an output end of the light source group.
Further, the lighting device comprises a plurality of LED lamp strings, the input end of each LED lamp string is electrically connected with the DC/DC constant voltage module, and the output end of each LED lamp string is electrically connected with one linear constant current module.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a light source driving circuit and a lighting device, wherein the light source driving circuit comprises a DC/DC constant voltage module and a linear constant current module, the DC/DC constant voltage module is electrically connected with a light source group, the DC/DC constant voltage module is electrically connected with an input power supply, the positive electrode of the linear constant current module is electrically connected with the light source group, and the negative electrode of the linear constant current module is grounded. The DC/DC constant voltage module is used as the front-end circuit, the input voltage is firstly adjusted to be within the range of the voltage of the light source group at the proper rear end in a high-efficiency driving mode, and then the current flowing through the LEDs is accurately controlled in a mode that the rear end is connected with the linear constant current module, so that the circuit conversion efficiency of the whole driving circuit is effectively improved on the driving circuit, the power consumption and the heat consumed by driving are reduced, and the area of the driving plate is effectively reduced. And the front-end DC/DC constant voltage module is arranged, the mode of the rear-end linear constant current module can control the external radiation interference quantity, and the anti-interference can be stronger.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 shows a schematic block diagram of a light source driving circuit according to an embodiment of the invention.
Fig. 2 shows a block diagram of a light source driving circuit according to an embodiment of the present invention.
Fig. 3 shows a circuit diagram of a light source driving circuit according to an embodiment of the present invention.
Fig. 4 shows a block diagram of another light source driving circuit according to an embodiment of the present invention.
Icon: 100-a light source driving circuit; a 110-DC/DC constant voltage module; 120-a linear constant current module; 130-a fault detection module; 140-a fail shutdown module; 150-an input filtering module; 160-an anti-reverse connection module; 200-light source group.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
Some embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
First embodiment
Referring to fig. 1 and 2, an embodiment of the present invention provides a light source driving circuit 100, where the light source driving circuit 100 includes an input filtering module 150, a reverse connection preventing module 160, a DC/DC constant voltage module 110, a linear constant current module 120, a fault detecting module 130, and a fault shutdown module 140. The input filter module 150, the anti-reverse connection module 160 and the DC/DC constant voltage module 110 are electrically connected in sequence, the DC/DC constant voltage module 110 is electrically connected with an input end of a light source group 200, an output end of the light source group 200 is electrically connected with an input end of the linear constant current module 120, an output end of the linear constant current module 120 is grounded, the fault detection module 130 is electrically connected with the light source group 200, the fault detection module 130 is electrically connected with the fault shutdown module 140, and the fault shutdown module 140 is electrically connected with the DC/DC constant voltage module 110.
In the first aspect, the DC/DC constant voltage module is used as the front-end primary module, the input voltage is adjusted to be within a range of the voltage of the rear-end light source group 200 (for example, 12V is reduced to 8V, the conversion efficiency is about 80% higher than the simple linear constant current conversion efficiency by 30%) through the DC/DC driving, and then the secondary connection linear constant current module 120 precisely controls the current flowing through the light source group 200. In the second aspect, since the hybrid module of front-end DC/DC constant-voltage driving and rear-end linear constant-current driving is adopted, the linear constant-current module 120 of the rear-end second stage can effectively relieve the external radiation interference of the front-stage DC/DC constant-voltage module, and compared with the traditional DC/DC constant-current driving, the external radiation interference of the switching power supply module can be effectively reduced, so that the EMC electromagnetic compatibility test is easier to pass. In the third aspect, on the primary and secondary driving power supply modules, a fault detection module 130 and a fault shutdown module 140 are additionally added at the secondary linear constant current module 120 end, and meanwhile, a DC/DC constant voltage module of the previous stage is turned off by the shutdown module, so that the fault shutdown current of the light source group 200 is reduced, and the lamp is easier to meet the current requirement of the whole vehicle factory body BCM on fault diagnosis.
Referring to fig. 3, the following describes the light source driving circuit 100 in detail:
the DC/DC constant voltage module 110 includes a DC/DC chip, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, a second capacitor C2, a first inductor L1, and a schottky diode D1, where in this embodiment, the DC/DC chip includes eight ports, the first port is a SELREF port, the second port is a power input end, the third port is an enable end, the fourth port is an overcurrent protection port, the fifth port is a SENSE port, the sixth port is an FGOOD port, the seventh port is a modulation output port, and the eighth port is a ground port.
The first port and the second port of the DC/DC chip are electrically connected to one end of the first resistor R1 and the input power supply respectively, the other end of the first resistor R1 is electrically connected to the fault shutdown module 140, the third port of the DC/DC chip is electrically connected to the fault shutdown module 140, the fourth port of the DC/DC chip is electrically connected to the second resistor R2 and then grounded, the second resistor R2 is further electrically connected to the fault shutdown module 140, the fifth port of the DC/DC chip is electrically connected to one end of the third resistor R3, the fourth resistor R4 and the first capacitor C1 respectively, the other end of the third resistor R3 is grounded, the other end of the fourth resistor R4 and the first capacitor C1 is electrically connected to one end of the first inductor L1, the sixth port of the DC/DC chip is electrically connected to one end of the fifth resistor R5, the other end of the fifth resistor R5 is electrically connected to one end of the first inductor L1, the seventh port of the DC/DC chip is electrically connected to the negative electrode of the schottky diode D1 and the other end of the first inductor L1 respectively, the positive electrode of the schottky diode D1 is grounded, the positive electrode of the schottky diode D2 of the second inductor C1 is connected to the other end of the second capacitor C2 is grounded, and the constant voltage capacitor C2 is connected to the other end of the capacitor C2 is connected to the constant voltage topology structure. The eighth port of the DC/DC chip is grounded, and one end of the first inductor L1 is further electrically connected to the light source group 200.
In the present embodiment, the connection point between the first inductor L1 and the second capacitor C2 is the output voltage port VLED of the DC/DC constant voltage module 110, which supplies power to the following light source set 200. Meanwhile, the VLED voltage is electrically connected to one end of the fourth resistor R4, the other end of the fourth resistor R4 is connected to one end of the third resistor R3, and the connection point is connected to a fifth port of the DC/DC chip as a voltage sampling point for overvoltage protection, and when the output voltage VLED exceeds a set value, the DC/DC chip can internally adjust the duty ratio of the PWM signal output from the seventh port to control the output voltage VLED within a set range. One end of the third resistor R3 is electrically connected with the fourth port of the DC/DC chip, the other end of the third resistor R3 is grounded, and the resistor is used for setting the overcurrent protection of the output current of the DC/DC chip. The third port of the DC/DC chip is connected to the first resistor R1 to the second port, and in this embodiment, the first resistor R1 is used as a pull-up resistor, and when the DC/DC chip is in normal operation, the third port is pulled up to a high level, so that the DC/DC chip is in normal operation.
In this embodiment, the DC/DC constant voltage module 110 adopts a BUCK mode, which can effectively improve the voltage conversion efficiency. Of course, in other embodiments, the DC/DC constant voltage module 110 may take other forms, and there may be sepic and ZETA constant voltage circuits with buck-boost forms, which is not limited in this embodiment.
Specifically, the fault shutdown module 140 includes a first transistor, a second transistor, a third transistor, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a third capacitor C3, and a fourth capacitor C4. In this embodiment, the first transistor is a PNP transistor, the second transistor and the third transistor are NPN transistors, however, in other embodiments, other combinations may be used, and this embodiment is not limited in any way.
The base of the first triode is electrically connected with the fault detection module 130 and one end of the third capacitor C3 respectively, the other end of the third capacitor C3 is grounded, the collector of the first triode is grounded, the emitter of the first triode is electrically connected with the base of the second triode and one end of the sixth resistor R6 respectively, the other end of the sixth resistor R6 is electrically connected with the input power supply, one end of the fourth capacitor C4 is electrically connected with the base of the second triode, the other end of the fourth capacitor C4 is grounded, the emitter of the second triode is grounded after being connected with the seventh resistor R7, the collector of the second triode is electrically connected with one end of the eighth resistor R8 and the third triode respectively, the other end of the eighth resistor R8 is electrically connected with the input power supply, the emitter of the third resistor R3 is grounded, and the collector of the third resistor R3 is electrically connected with the third resistor R1 and the third port of the DC/DC chip respectively.
In this embodiment, the third capacitor C3 is used as a bypass capacitor, the sixth resistor R6 is pulled up to be electrically connected to the vn point, and the eighth resistor R8 is also pulled up to be electrically connected to the vn point. In this embodiment, the working principle of the fault shutdown module 140 is: when the light source group 200 fails, the voltage at the point a is reduced, the first triode is turned on, so that the voltage at the end B is reduced, the second triode is in a cut-off state, so that the voltage at the point C is increased, the third triode is turned on to the ground, the third port of the DC/DC chip is grounded, the third port of the DC/DC chip is at a low level, the DC/DC chip does not work, and the back-end circuit does not work. When the light source set 200 is normal, the voltage at the point a is increased, the first triode is turned off, so that the voltage at the end B is increased, the second triode is in a conducting state, so that the voltage at the point C is reduced, the third triode is turned off, and the third port of the DC/DC chip is connected with the pull-up resistor, so that the third port receives a high level, the DC/DC chip works normally, and the back-end circuit works.
The linear constant current module 120 includes a fourth triode, a fifth triode, a ninth resistor R9 and a tenth resistor R10, where the collector of the fourth triode is electrically connected with the light source set 200, the emitter of the fourth triode is electrically connected with the base of the fifth triode and the ninth resistor R9, the ninth resistor R9 is grounded, the base of the fourth triode is electrically connected with the collector of the fifth triode and one end of the tenth resistor R10, the other end of the tenth resistor R10 is electrically connected with the output end of the DC/DC constant voltage module 110, and the emitter of the fifth triode is grounded.
The other end of the tenth resistor R10 is connected to the output end of the DC/DC constant voltage module 110, so as to supply power to the linear constant current module 120. In this embodiment, the linear constant current module 120 includes a plurality of linear constant current modules 120, and each of the plurality of linear constant current modules 120 is electrically connected to the light source. In addition, the fault detection module 130 provided in this embodiment includes a plurality of diodes, where the cathode of each diode is electrically connected to the cathode of the light source group 200, and the anode of each diode is electrically connected to the point a. Thereby performing an off operation when the light source bank 200 fails. Of course, in other embodiments, the fault detection module 130 and the fault shutdown module 140 may be collocated with other circuits, which is not limited in this embodiment.
In this embodiment, the input filter module 150 includes a second inductor L2, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, and an eighth capacitor C8, where a first end of the second inductor L2 is electrically connected to the input power, a second end of the second inductor L2 is point-connected to the DC/DC constant voltage module 110, the fifth capacitor C5 is connected in series with the sixth capacitor C6, one end of the fifth capacitor C5 is electrically connected to the first end of the second inductor L2, the sixth capacitor C6 is grounded, one end of the seventh capacitor C7 is electrically connected to the first end of the second inductor L2, and the other end of the seventh capacitor C8 is electrically connected to the second end of the second inductor L2, and the other end of the eighth capacitor C8 is grounded. The seventh capacitor C7, the eighth capacitor C8 and the second inductor L2 form a bridge filter circuit. Of course, in other embodiments, the input filter module 150 may also use other circuit configurations, which are not limited in this embodiment.
In order to prevent the operator from damaging the back-end device when connecting to the power supply, the light source driving circuit 100 is provided with a reverse connection preventing module 160, in this embodiment, the reverse connection preventing module 160 is a reverse connection preventing diode, the positive electrode of the reverse connection preventing diode is electrically connected to the input filter module 150, and the negative electrode of the reverse connection preventing diode is electrically connected to the DC/DC constant voltage module 110. Of course, in other embodiments, other devices may be used for the anti-reverse connection module 160, for example, PMOS is used as the anti-reverse connection module 160, which is not limited in this embodiment.
The circuit provided by this embodiment has the following working principle:
the input filter module 150 and the DC/DC constant current module form a first stage DC/DC constant voltage circuit, the input filter module 150 is configured to mitigate ripple of the DC/DC switching power supply circuit, a modulation output port LXT (i.e., a seventh port) of the DC/DC chip in the DC/DC constant current module, a schottky diode, a first inductor L1, and a connection manner of the second capacitor C2 form a BUCK topology, a constant voltage outputs a VLED point voltage, the point voltage is used to supply power to the anode of the light source set 200, and the cathode of the light source set 200 is connected to the input end D point of the second stage linear constant current module 120.
The working principle of the linear constant current module 120 is: the voltage across the ninth resistor R9 (i.e. VBE of the fifth transistor) is kept constant by the connection between the fourth transistor and the fifth transistor, so that the current flowing across the ninth resistor R9 can be kept constant, and the current I R9 =vbe/R9, wherein VBE is approximately equal to 0.6V; also, since the collector current I C of the fourth transistor is approximately equal to the emitter current I E, I E = I C (1+1/β), the current flowing through the light source bank 200 (i.e., the collector current of the fourth transistor) is approximately equal to the current flowing through the ninth resistor R9 (i.e., the emitter current of the fourth transistor).
In the present embodiment, the light source group 200 includes a plurality of light source strings, and the fault detection module 130 and the fault shutdown module 140 constitute fault detection and shutdown of each light source string. D3, D4, D5 are responsible for detecting the fault of each light source string branch, and when a fault occurs in any one string of light source strings, the fault signal is transmitted to the point a of the fault shutdown circuit. When the light source group 200 fails, the voltage at the point A becomes low, the first triode is conducted to the ground, the voltage at the point B becomes low, the second triode is cut off, the voltage at the point C becomes high, and the third triode is conducted to the ground, so that the third port of the DC/DC chip is pulled down to the ground, and the DC/DC chip does not work, thereby cutting off the power supply branch of the whole light source driving circuit 100, closing all the light source groups 200, and simultaneously enabling the fault diagnosis current to meet the requirement of being smaller than a certain value; when the light source set 200 works normally, the voltage at the point A becomes high, the first triode is cut off, the voltage at the point B becomes high, the second triode is conducted, the voltage at the point C becomes low, the third triode is cut off, the third port of the DC/DC chip is pulled up to VI N, the DC/DC chip works normally, and the light source set 200 has normal power supply voltage, so that the light source set can work normally.
Second embodiment
Referring to fig. 4, the embodiment of the present invention further provides another light source driving circuit, and it should be noted that the circuit structure principle of the light source driving circuit provided in the present embodiment is basically the same as that of the light source driving circuit provided in the first embodiment, so that the present embodiment only describes different circuit structures of the two, and the same structure is referred to fig. 1.
Specifically, the light source driving circuit 100 includes an input filtering module 150, a reverse connection preventing module 160, a DC/DC constant voltage module 110, a linear constant current module 120, a fault detecting module 130, and a fault shutting-off module 140. The input filter module 150, the anti-reverse connection module 160 and the DC/DC constant voltage module 110 are electrically connected in sequence, the DC/DC constant voltage module is electrically connected with the positive electrode of the linear constant current module, the negative electrode of the linear constant current module is electrically connected with the positive electrode of a light source group, and the negative electrode of the light source group is grounded. The fault detection module 130 is electrically connected to the negative electrode of the linear constant current module, and the fault detection module 130 is electrically connected to the fault shut-down module 140, and the fault shut-down module 140 is electrically connected to the DC/DC constant voltage module 110. Third embodiment
Referring to fig. 1, an embodiment of the present invention provides a lighting device, which includes a light source group 200 and a light source driving circuit 100 according to the first embodiment, a DC/DC constant voltage module 110 of the light source driving circuit 100 is electrically connected to an input end of the light source group 200, and a linear constant current module 120 of the light source driving circuit 100 is electrically connected to an output end of the light source group 200.
Further, in the present embodiment, the lighting device includes a plurality of LED strings, each LED string includes a plurality of LED lamps, and an input end of each LED string is electrically connected to the DC/DC constant voltage module 110, and an output end of each LED string is electrically connected to one linear constant current module 120. Of course, in other embodiments, the lighting device may also include other devices, which are not limited in this embodiment.
It should be noted that, in this embodiment, one pole of each LED string of the light source group 200 is independently separated and is respectively connected with the positive pole of the linear constant current module 120 of each branch, the negative pole of the linear constant current branch of the linear constant current module 120 is connected with the ground GND to complete the integrity of the current loop, the linear constant current branch of the linear constant current module 120 can be expanded from 1 to N, and according to the actual number of LEDs, this embodiment is not limited in any way. The fault detection module 130 adopts or logic to feed back the LED fault in any string of branches to the fault shutdown module 140, and finally the output end of the fault shutdown circuit is connected to the enable port ON of the DC/DC constant voltage module 110, and when the fault detection module 130 detects a single LED fault, the fault shutdown circuit is started to close the enable port ON of the DC/DC constant voltage module 110, so that the DC/DC constant voltage stops working, and the power supply of the whole system circuit is cut off, so as to achieve the purpose of reducing the fault shutdown current.
It should be further noted that, from the perspective of regulations, the current requirement for the vehicle body signal lamp is that a single LED is damaged, all LEDs are turned off, and meanwhile, the vehicle body control unit has a certain requirement for the driving consumption current (i.e. fault diagnosis current) of the whole LED after the LED is damaged (for example, the driving consumption current of the LED function must be less than 10mA after the single LED fails). Therefore, in this embodiment, the purpose of reducing the fault shutdown current is achieved by cutting off the power supply of the overall system circuit, so as to meet the regulatory requirements.
In summary, the present invention provides a light source driving circuit and a lighting device, where the light source driving circuit includes a DC/DC constant voltage module and a linear constant current module, the DC/DC constant voltage module is electrically connected to a light source group, the DC/DC constant voltage module is electrically connected to an input power source, a positive electrode of the linear constant current module is electrically connected to the light source group, and a negative electrode of the linear constant current module is grounded. The DC/DC constant voltage module is used as the front-end circuit, the input voltage is firstly adjusted to be within the range of the voltage of the light source group at the proper rear end in a high-efficiency driving mode, and then the current flowing through the LEDs is accurately controlled in a mode that the rear end is connected with the linear constant current module, so that the circuit conversion efficiency of the whole driving circuit is effectively improved on the driving circuit, the power consumption and the heat consumed by driving are reduced, and the area of the driving plate is effectively reduced. And the front-end DC/DC constant voltage module is arranged, the mode of the rear-end linear constant current module can control the external radiation interference quantity, and the anti-interference can be stronger.
In the description of the present invention, it should be noted that the terms "first," "second," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance. The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The light source driving circuit is characterized by comprising a DC/DC constant voltage module and a linear constant current module, wherein the DC/DC constant voltage module is electrically connected with a light source group and is used for being electrically connected with an input power supply, the positive electrode of the linear constant current module is electrically connected with the light source group, and the negative electrode of the linear constant current module is grounded;
the light source driving circuit further comprises a fault detection module and a fault shut-off module, wherein the output end of the light source group is electrically connected with the fault detection module, the fault detection module is electrically connected with the fault shut-off module, and the fault shut-off module is electrically connected with the DC/DC constant voltage module;
and when the light source group fails, the DC/DC constant voltage module does not work.
2. The light source driving circuit according to claim 1, wherein the DC/DC constant voltage module comprises a DC/DC chip, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first capacitor, a second capacitor, a first inductor and a schottky diode, wherein the first port and the second port of the DC/DC chip are electrically connected to one end of the first resistor and the input power supply, respectively, the other end of the first resistor is electrically connected to the fault shutdown module, the third port of the DC/DC chip is electrically connected to the fault shutdown module, the fourth port of the DC/DC chip is electrically connected to the second resistor and then grounded, and the second resistor is also electrically connected to the fault shutdown module, the fifth port of the DC/DC chip is electrically connected to one end of the third resistor, the fourth resistor and the first capacitor, the other end of the third resistor is grounded, the other end of the fourth resistor is electrically connected to the first capacitor, the other end of the fourth resistor is electrically connected to the second capacitor, the second port of the third resistor is electrically connected to the second capacitor, the other end of the third resistor is electrically connected to the second capacitor, the fifth port of the third resistor is electrically connected to the third capacitor, the other end of the third resistor is electrically grounded, the fifth port of the third resistor is electrically connected to the third capacitor, the other end of the third resistor is electrically connected to the third capacitor, the fifth port of the third capacitor is electrically connected to the fourth capacitor is grounded.
3. The light source driving circuit according to claim 2, wherein the fault shutdown module comprises a first triode, a second triode, a third triode, a sixth resistor, a seventh resistor, an eighth resistor, a third capacitor and a fourth capacitor, wherein a base electrode of the first triode is respectively and electrically connected with one end of the fault detection module and one end of the third capacitor, the other end of the third capacitor is grounded, a collector electrode of the first triode is grounded, an emitter electrode of the first triode is respectively and electrically connected with a base electrode of the second triode and one end of the sixth resistor, the other end of the sixth resistor is electrically connected with the input power supply, one end of the fourth capacitor is electrically connected with a base electrode of the second triode, the other end of the fourth capacitor is grounded, an emitter electrode of the second triode is respectively and electrically connected with one end of the eighth resistor and the third triode, the other end of the eighth resistor is respectively and electrically connected with a collector electrode of the third resistor, and the third triode is respectively connected with the DC/DC input power supply and the third resistor.
4. The light source driving circuit according to claim 1, wherein the linear constant current module comprises a fourth triode, a fifth triode, a ninth resistor and a tenth resistor, wherein a collector of the fourth triode is electrically connected with the light source group, an emitter of the fourth triode is electrically connected with a base of the fifth triode and the ninth resistor respectively, the ninth resistor is grounded, a base of the fourth triode is electrically connected with the collector of the fifth triode and one end of the tenth resistor respectively, the other end of the tenth resistor is electrically connected with an output end of the DC/DC constant voltage module, and the emitter of the fifth triode is grounded.
5. The light source driver circuit of claim 1, further comprising an input filter module electrically connected to the DC/DC constant voltage module and configured to be electrically connected to the input power supply.
6. The light source driving circuit according to claim 5, wherein the input filter module comprises a second inductor, a fifth capacitor, a sixth capacitor, a seventh capacitor and an eighth capacitor, a first end of the second inductor is electrically connected to the input power supply, a second end of the second inductor is point-connected to the DC/DC constant voltage module, the fifth capacitor is connected in series with the sixth capacitor, one end of the fifth capacitor is electrically connected to the first end of the second inductor, the sixth capacitor is grounded, one end of the seventh capacitor is electrically connected to the first end of the second inductor, the other end of the seventh capacitor is grounded, one end of the eighth capacitor is electrically connected to the second end of the second inductor, and the other end of the eighth capacitor is grounded.
7. The light source driving circuit is characterized by comprising a DC/DC constant voltage module and a linear constant current module, wherein the DC/DC constant voltage module is electrically connected with the positive electrode of the linear constant current module, the DC/DC constant voltage module is electrically connected with an input power supply, the negative electrode of the linear constant current module is electrically connected with the positive electrode of a light source group, and the negative electrode of the light source group is grounded;
the light source driving circuit further comprises a fault detection module and a fault shut-off module, wherein the output end of the light source group is electrically connected with the fault detection module, the fault detection module is electrically connected with the fault shut-off module, and the fault shut-off module is electrically connected with the DC/DC constant voltage module;
and when the light source group fails, the DC/DC constant voltage module does not work.
8. A lighting device comprising a light source group and the light source driving circuit according to any one of claims 1 to 7, wherein a DC/DC constant voltage module of the light source driving circuit is electrically connected to an input terminal of the light source group, and a linear constant current module of the light source driving circuit is electrically connected to an output terminal of the light source group.
9. The lighting device of claim 8, wherein said lighting device comprises a plurality of LED strings, an input of each of said LED strings being electrically connected to said DC/DC constant voltage module, and an output of each of said LED strings being electrically connected to one of said linear constant current modules.
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| CN109362141A (en) * | 2018-09-13 | 2019-02-19 | 华域视觉科技(上海)有限公司 | OLED light source drive control circuit and OLED luminaire |
| CN109688664A (en) * | 2019-01-25 | 2019-04-26 | 常州星宇车灯股份有限公司 | LED drive circuit and car light and automobile with it |
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