Light source driving device

Abstract

To provide a light source driving device capable of protecting a light emitting diode by sensing various abnormal states which may occur in a driving environment of the light emitting diode.SOLUTION: A light source drive device includes: a light source unit; a constant current drive unit which includes a first switching element connected to the light source unit and causes a constant current to be supplied to the light source unit on the basis of a switching operation of the first switching element; a drive control unit which outputs a switching signal for controlling the first switching element; an abnormal state detection unit which receives state signals corresponding to the light source unit and the drive control unit and outputs a control signal on the basis of the received state signals; and an output protection circuit unit connected to an output terminal of the light source unit, wherein the output protection circuit unit includes a 4.5.6 switching element which is connected to the abnormal state detection unit and performs a switching operation in conjunction with the abnormal state detection unit on the basis of a control signal outputted from the abnormal state detection unit.SELECTED DRAWING: Figure 9

Description

[Technical Field]

[0001] The embodiment relates to a light source driving device, and in particular, to a device for detecting various abnormal states of a light source unit and The present invention relates to a light source driving device that can stop driving a light source unit by detecting That is why. [Background technology]

[0002] Lighting is a device that can provide light and adjust the amount of light, and is used in a variety of fields. For example, lighting devices are used in various fields such as vehicles and buildings to brighten the interior or exterior of the vehicle. This can be done.

[0003] In particular, light-emitting elements have recently been used as light sources for illumination. For example, light-emitting diodes (LEDs) consume less power than existing light sources such as fluorescent lamps and incandescent lamps. It has a semi-permanent lifespan, fast response speed, safety, and environmental friendliness. Such light emitting diodes are used in various optical assemblies such as various display devices, interior and exterior lights, etc. This applies to Lee.

[0004] Generally, lamps of various colors and shapes are used in vehicles, and recently, luminous LEDs have been used as vehicle light sources. Lamps employing light emitting diodes have been proposed. It is applied to headlights, taillights, turn signals, daytime running lights, and sidelights.

[0005] At this time, the driving device for controlling the driving of the lamp is a power supply unit (not shown). A PWM (Pulse Width Modulation) type constant current is applied to the The constant current is used to drive the light emitting diode. The brightness is controlled by adjusting the intensity of the applied current.

[0006] On the other hand, recently, transistor-based countermeasures have been developed to construct low-cost light source drivers. In the case where a symmetric control method is adopted and multiple light-emitting diodes are configured in series or / and parallel, In this case, a linear circuit is used to control each light-emitting diode. In the case of a linear circuit such as Therefore, constant current circuits using transistors are widely used.

[0007] However, in the case of a constant current circuit using a transistor as described above, the driving There is no sensing circuit that can detect various abnormal events that occur in a dynamic environment. Even if an abnormal status event such as the above is detected, the LED will continue to be driven. This has led to reliability issues. Summary of the Invention [Problem to be solved by the invention]

[0008] In the embodiment, various abnormal conditions that may occur in the driving environment of the light emitting diode are detected, and The present invention provides a light source driving device that can protect the light emitting diode.

[0009] The technical problems to be solved by the present invention are not limited to the above-mentioned technical problems. However, other unmentioned technical problems can be understood from the following description as to the technology to which the embodiments belong. will be clearly understood by those of ordinary skill in the art. [Means for solving the problem]

[0010] The light source driving device according to the embodiment includes a light source unit and a first switching element connected to the light source unit. a constant current is supplied to the light source unit based on the switching operation of the first switching element; a constant current driver for supplying a first switching element to the constant current driver; a drive control unit that outputs a switching signal for controlling a light source element; An abnormal state of the drive control unit is detected, and a control signal is output based on the detected abnormal state. a detecting unit, and a detecting unit selectively operating based on a control signal output from the abnormal state detecting unit to detect the abnormal state; The light source includes a constant current driver and a protection circuit for stopping the operation of the light source.

[0011] A first protection circuit connected to the input terminal of the light source unit and a second protection circuit connected to the output terminal of the light source unit The second protection circuit unit includes at least one of the second protection circuits.

[0012] The first protection circuit is connected to the abnormal state detection unit. a second switching element that performs a switching operation based on a control signal output from the a second switching element connected to the second switching element, and The third switching element performs a switching operation.

[0013] The second switching element has a first base terminal connected to the abnormal state detector. a first collector terminal connected to the input terminal of the light source unit, and a first emitter terminal connected to the ground; the third switching element is connected to the first collector terminal of the second switching element. a second base terminal connected to the base terminal of the first switching element; The diode includes a first emitter terminal coupled to ground and a second emitter terminal coupled to ground.

[0014] Also, the second switching element is turned on when the control signal is at a first level. When the control signal is at a second level, the third switching element is turned on and when the control signal is at a second level, the third switching element is turned off. When the control signal is at the first level, the transistor is turned off. If the level is high, the first switching element is turned on, and the third switching element is turned on. If the element is in a turned-on state, it remains turned-off.

[0015] The first protection circuit has a first cathode terminal connected to an input terminal of the light source unit, a first Zener diode having an anode connected to the second base of the third switching element; Includes code.

[0016] The first Zener diode applies a second voltage higher than the first voltage to the input terminal of the light source unit. When a voltage is applied, the third switching element is turned on. The first switching element is changed to a turn-on state in response to the turn-on of the When the third switching element is in a turned-on state, the third switching element maintains the turned-off state. do.

[0017] The second protection circuit is connected to the abnormal state detection unit. a fourth switching element that performs a switching operation based on a control signal output from the 4 switching element, and based on the switching operation of the fourth switching element, a fifth switching element that is connected to the fifth switching element and performs a switching operation; a sixth switching element that performs a switching operation based on the switching operation of the fifth switching element; and a switching element.

[0018] The fourth switching element has a third base terminal connected to the abnormal state detector. a third collector terminal connected to the fifth switching element; and a third emitter terminal connected to the ground. the fifth switching element includes a third collector terminal of the fourth switching element; a fourth base terminal connected to a collector terminal, an output terminal of the light source unit, and the sixth switching element; a fourth collector terminal connected to the ground and a fourth emitter terminal connected to the ground, The fifth switching element has a source terminal connected to an output terminal of the light source unit and a second switching element. The transistor has a gate terminal connected to the fourth collector terminal and a drain terminal connected to ground.

[0019] Also, the fourth switching element is turned on when the control signal is at a first level. When the control signal is at a second level, the fifth switching element is turned on and when the control signal is at a second level, the fifth switching element is turned off. When the control signal is at the first level, the transistor is turned off. When the control signal is at the level When the control signal is at the first level, it turns off, and when the control signal is at the second level, it turns on. When the sixth switching element is turned on, the voltage applied to the light source is The current flows through a path including the sixth switching element.

[0020] The abnormal state detector receives a first state signal and a second state signal, and a first AND gate for outputting a first control signal based on a second state signal; and a third state signal, and outputting a second control signal based on the first and third state signals. The input includes a second AND gate.

[0021] The first status signal is a status signal of a power supply supplied to the drive control unit, The second status signal is a status signal of the clock signal output from the drive control unit, The three-state signal includes a state signal corresponding to an open state or a short state of the light source unit. .

[0022] The protection circuit unit includes the first protection circuit unit and the second protection circuit unit, The AND gate is connected to the protection circuit of either the first protection circuit unit or the second protection circuit unit. the first control signal is output to the first protection circuit unit, and the second AND gate is connected to the first protection circuit unit and and outputs the second control signal to another one of the second protection circuit units. [Effects of the Invention]

[0023] The embodiment can improve the operational reliability of the light source unit. The first protection circuit may include a first protection circuit disposed at an input end of the front end of the protection circuit. An abnormal state of the light source unit, an abnormal state of the power supply supplied to the drive control unit, and a power supply provided by the drive control unit When an abnormal state of the clock signal is detected, the light source unit is turned on and the light emitting operation is stopped. In this way, in the embodiment, the above-mentioned various abnormal conditions can be This can solve the reliability problem that may occur due to the light source continuing to operate. This makes it possible to protect each component circuit that constitutes the light source driving device. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a block diagram showing a configuration of a light source driving device according to an embodiment; [Figure 2] 2 is a block diagram specifically showing another embodiment of the light source unit of FIG. 1. FIG. [Figure 3] 2 is a circuit diagram specifically showing the light source driving device shown in FIG. 1. FIG. [Figure 4] 4 is a diagram illustrating an example of the operation of the light source unit illustrated in FIG. 3. [Figure 5] 2 is a circuit diagram specifically illustrating the abnormal state detector shown in FIG. 1; [Figure 6] 4 is a diagram showing an operation waveform of the light source driving device according to the embodiment; [Figure 7] FIG. 10 is a block diagram showing the configuration of a light source driving device according to another embodiment. [Figure 8] 8 is a circuit diagram specifically showing the light source driving device shown in FIG. 7. FIG. [Figure 9] FIG. 10 is a circuit diagram specifically showing a light source driving device according to yet another embodiment. [Figure 10] 1 is a top view of a vehicle to which a lamp having a light source driving device according to an embodiment is applied; [Figure 11] 1 is an example in which the light source driving device according to the embodiment is disposed at the front of a vehicle. [Figure 12] 1 is an example in which the lighting driving device according to the embodiment is disposed at the rear of a vehicle. DETAILED DESCRIPTION OF THE INVENTION

[0025] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0026] However, the technical idea of ​​the present invention is not limited to the described embodiments. The present invention can be embodied in various different forms, and the embodiments are within the scope of the technical concept of the present invention. One or more of the components can be selectively combined or substituted between the components.

[0027] Furthermore, terms (including technical and scientific terms) used in the embodiments of the present invention are clearly defined. Unless otherwise specifically described, the present invention will be understood by those skilled in the art. Commonly used terms, such as dictionary-defined terms, are interpreted as meanings that can be used. The meaning can be interpreted taking into account the contextual meaning of the technology involved.

[0028] Furthermore, the terms used in the examples of the present invention are for the purpose of explaining the examples, and In this specification, the singular forms "a," "an," and "the" are used interchangeably unless specifically stated in a phrase. It can also include plural forms as long as it is not specified, and it can be specified as "A and B, and at least one of C (or more than one)". )" means one or more of all possible combinations of A, B, and C. may include:

[0029] In addition, in the description of the components of the embodiment of the present invention, first, second, A, B, (a), (b Such terms may be used to distinguish the component from other components. The term is used to distinguish between the elements, and does not limit the essence or order of the elements. and that one component is "connected," "coupled," or "attached" to another component. When a component is described as being "connected," the component is not directly connected, bonded, or coupled to another component. Not only when the component is connected, but also when there is another structure between that component and other components. This also includes cases where the elements are "coupled," "coupled," or "connected" by components.

[0030] In addition, when it is described as being formed or arranged "above or below" each component, it is also "At or below" does not only mean when two components are in direct contact, but also when one or more other components are in contact. This also includes cases where a component is formed or placed between two components. When expressed, it means not only the upward direction but also the downward direction based on one component. It can include.

[0031] FIG. 1 is a block diagram showing the configuration of a light source driving device according to an embodiment, and FIG. 2 is a block diagram showing the configuration of the light source driving device according to an embodiment of the present invention. FIG. 10 is a block diagram specifically showing another embodiment of the light source unit.

[0032] Referring to FIG. 1, the light source driving device includes a light source unit 110, a constant current driving unit 120, and a driving control unit. 130, a first protection circuit unit 140, and an abnormal state detection unit 150.

[0033] The light source unit 110 may include at least one light emitting diode.

[0034] When the light source unit 110 includes a plurality of light emitting diodes, the plurality of light emitting diodes are may be connected in series or in parallel.

[0035] The light source unit 110 includes a light emitting package in which a light emitting diode chip is packaged. The light emitting diode chip may include blue, green, red, ultraviolet (UV) and and infrared rays.

[0036] The light source unit 110 may be mounted on a vehicle to form a lamp. The light source unit 110 is provided at least one at the front, rear, and side of the vehicle. For example, the light source unit 110 can be applied to a front lamp of a vehicle. For example, the light source unit 110 may emit light to provide a headlight, a turn signal light, a daytime running light, a It can function as at least one of main beam, low beam and fog lamp. For example, the light source unit 110 emits light in conjunction with the opening of a vehicle door to provide a welcome light. It provides additional features such as a Celebration effect. For example, the light source unit 110 can emit light to provide a side light, a brake light, a direction light, and the like. The present invention can be applied to a rear lamp that functions as at least one of the indicator lights.

[0037] The light source unit 110 is driven by an applied current. For example, the driving device of the embodiment includes: A pulse type current is applied from a main control module (not shown). The current may be a constant current. The constant current input unit 100a may include a constant current input unit 100a to which a constant current is input from an input control module.

[0038] The constant current input unit 100a is connected to a PWM (Pulse Width Modulation) The main control module is connected to a number of It may also be a module that controls a specific main lamp among the lamps. For example, The main control module includes a headlamp control module (H CM (Headlamp Control Module) may be used, but In the above, the current output from a separate module is used to Although it has been described that the voltage is applied to the light source unit 110 of the power driver, it is not limited to this. In the above, the current supplied from a separate module is supplied to the light source unit 1 of the light source driving device. However, the present invention is not limited to this. The light source driving device is connected to a vehicle battery (not shown) and discharges the battery. a converter (not shown) for driving the light source unit 110 based on the power supplied by the may further comprise:

[0039] The light source unit 110 is driven by a current applied from the constant current input unit 100a. It is possible to output light of a specific color and brightness.

[0040] The light source unit 110 may include one light emitting diode, or alternatively, may include multiple light emitting diodes. For example, the light source unit 110 may include a plurality of light emitting diodes. When the LED includes a mode, the plurality of light emitting diodes are simultaneously turned on or off.

[0041] For example, the light source unit 110 may be divided into a plurality of channels. The source unit 110 includes a first light source unit 111 of a first channel including a plurality of light emitting diodes, a plurality of a second light source unit 112 of a second channel including a light emitting diode and a second light source unit 113 including a plurality of light emitting diodes; In this case, the first to third light sources may include a third light source unit 113 of a third channel. The light emitting diodes constituting the sections 111, 112, and 113 may each be constituted by a single light emitting diode. Alternatively, two or more LEDs may be connected in series. can.

[0042] The plurality of light emitting diodes constituting the first light source unit 111 are lit simultaneously. The plurality of light emitting diodes constituting the second light source unit 112 are turned on and off at the same time. are turned on and off simultaneously. The plurality of light emitting diodes are simultaneously turned on and off. The first light source unit 111, the second light source unit 112, and the third light source unit 113 that constitute each channel The plurality of light-emitting diodes in the LED are driven by an applied current and emit light simultaneously. The light can be turned off at the same time by cutting off the applied current.

[0043] In addition, a first light source unit 111, a second light source unit 112, and a The third light source units 113 are turned on and off simultaneously.

[0044] In contrast, the first light source unit 111, the second light source unit 112, and the third light source unit 113 may be turned on at different times and turned off at different times. The plurality of light emitting diodes constituting the first light source unit 111 are turned on at a first time point, and the second light The light emitting diodes constituting the light source unit 112 are turned on at a second time point different from the first time point. The plurality of light emitting diodes constituting the third light source unit 113 may be The light may be turned on at a third time point different from the second time point.

[0045] Meanwhile, the first light source unit 111, the second light source unit 112, and the third light source unit 113 are each configured as follows: The plurality of light emitting diodes constituting the light source may be lit sequentially or in stages. The first light source unit 111 includes first to third light emitting diodes. The third light emitting diodes may be operated to emit light at different times. At least one of the first to third light emitting diodes is capable of emitting light at a first time point. and at least one of the first and second light emitting elements can be operated to emit light at a second time point that is later than the first time point. For example, the first to third light emitting diodes may be configured to emit light at regular time intervals. As a result, the light source unit 110 in the embodiment can be configured to include a plurality of light emitting diodes. By sequentially lighting up the lights, an animation effect can be created. The first to third light emitting diodes are turned on at different times and turned off at the same time. For the above-mentioned stepwise light emission operation, the first light source unit 111 Each of the second light source unit 112 and the third light source unit 113 has the following circuit configuration: It is possible.

[0046] FIG. 2 shows any one of the first light source unit 111, the second light source unit 112, and the third light source unit 113. FIG. 2 is a detailed configuration diagram of one light source unit.

[0047] Referring to FIG. 2, the first light source unit 111, the second light source unit 112, and the third light source unit 113 At least one of them includes a first light emitting diode 210 and a second light emitting diode 220. The first light emitting diode 210 and the second light emitting diode 220 may be directly In this case, the first light source unit 111, the second light source unit 112 and the third light source unit 113 may be connected in a row. At least one of the units 113 is shown as including two light emitting diodes. For example, the first light source unit 111, the second light source unit 112, and the third light source unit 113 may be At least one of the light sources 113 includes three or more light emitting diodes. The lights can be lit sequentially or in stages to create an animation effect.

[0048] The light source unit is connected to both ends of each of the light emitting diodes. For example, the light source unit may include a detector for detecting an abnormal state of the light emitting diode. For example, the first and second light emitting diodes 210 and 211 may operate in an abnormal state. During operation, the photodiode 220 may experience abnormal conditions such as an open circuit or a short circuit. The first sensing unit 230 senses an abnormal state that may occur in the first light emitting diode 210. In addition, the second sensing unit 240 may be generated by the second light emitting diode 210. The abnormal state can be detected by detecting an open state of the light emitting diode and The first sensing unit 230 may be in a short state. The second sensing unit 240 can sense the first voltage across the second A second voltage across the light emitting diode 220 can be sensed.

[0049] The light source unit may include an individual switch. The individual switches are individually connected to the respective light emitting diodes. For example, each individual switch can The first individual switch 250 may include the first individual switch 250. The first light emitting diode 210 is connected to both ends of the first light emitting diode 210. The individual switches include a second individual switch 260. The second individual switch 260 may be connected to both ends of the second light emitting diode 220. , and can turn on / off the current flowing through the second light emitting diode 220. The first individual switch 250 is turned on to apply a current to the first light emitting diode 210. current is supplied to the first light emitting diode 210 in the turned-off state. Similarly, the second individual switch 260 can be turned on. In the turn-off state, a current is supplied to the second light emitting diode 220. The current flowing through the second light emitting diode 220 can be cut off.

[0050] The light source unit may include an individual control unit 270. The individual control unit 270 , by controlling the switching state of the first individual switch 250 to turn on the first light emitting diode 2 The individual control unit 270 can control the light emitting operation of the second individual The switching state of the switch 260 is controlled to control the light emitting operation of the second light emitting diode 220. In addition, the individual control unit 270 can detect an abnormal state of the light source driving device. The abnormal state detecting unit 150 is connected to the first light emitting diode 210 and 2 LED 220. For example, the individual control The first voltage sensed by the first sensing unit 230 and the second sensing unit 240 is input to the voltage sensing unit 270. If the second voltages detected through the abnormal state detector are all within the normal range, the abnormal state detector outputs a high signal to the second voltage detector. 150. In addition, the individual control unit 270 can transmit the first sensing unit 230 The first voltage sensed through the second sensing unit 240 and the second voltage sensed through the second sensing unit 240 are the minimum of the first voltage sensed through the second sensing unit 240 and the second voltage sensed through the second sensing unit 240. If at least one voltage is out of the normal range, a low signal is sent to the abnormal state detector 150. It can be transmitted.

[0051] As mentioned above, the high-spec light source that can realize the animation effect has a sensing part. , individual switches and individual control sections are included, thereby allowing individual control of each light emitting diode. It is possible to control it.

[0052] Meanwhile, the constant current driver 120 can control the light source unit 110 with a constant current. For example, the constant current driver 120 is a switching element connected to the output terminal of the light source unit 110. It can contain children.

[0053] The switching element constituting the constant current driving unit 120 controls the current flowing to the light source unit 110. For example, the constant current driver 120 controls the magnitude of the current. Therefore, the constant current can be supplied to the The current driver 120 feeds back the current flowing through the light source 110 and itself. Then, the constant current driver 120 can determine the value of the constant current based on the result of the feedback. Based on this, the output amplitude can be varied to maintain a constant current. The constant current driver 120 controls the brightness dimming of the light source 110 linearly. It can generate WM (Pulse Width Modulation) control signals. For example, the constant current driver 120 may be configured to dim the brightness of the light source 110. The duty ratio of the PWM control signal can be controlled. 20 performs a switching operation based on the PWM control signal to control the light source unit 110. It can act as a load to absorb the voltage difference caused by the voltage increase or decrease.

[0054] The drive control unit 130 generates the PWM control signal and controls the front end based on the PWM control signal. The drive control unit 130 can control the constant current drive unit 120. The drive control unit 130 may include a microcomputer. The drive control unit 130 can be, but is not limited to, a clock signal. and the overall operation of the light source driving device is performed based on the clock signal. For example, the drive control unit 130 controls the constant current based on the clock signal. The drive unit 120 can be controlled.

[0055] The embodiment includes a first protection circuit unit 140. The first protection circuit unit 140 is The first protection circuit unit 140 is disposed between the power unit 100a and the light source unit 110. If an abnormal state occurs during operation of the light source unit 110, the operation of the light source unit 110 is stopped (for example, For example, the current flowing through the light source unit 110 can be cut off. The protection circuit unit 140 is disposed between the input terminal of the light source unit 110 and the constant current driver unit 120. When the abnormal state is detected, the first protection circuit unit 140 turns on the constant current The constant current driver 120 then transmits a corresponding signal to the driver 120. The light source is switched on and off based on a signal provided from the first protection circuit unit 140. For example, the constant current driver 120 can cut off the current flowing through the The first protection circuit unit 140 operates in a turn-off state based on a signal provided from the first protection circuit unit 140. The current applied to the source 110 can be interrupted.

[0056] The abnormal state detector 150 detects various abnormal states that may occur during the operation of the light source unit 110. , and can output a control signal corresponding to whether or not the abnormal state is detected.

[0057] For example, the abnormal state detector 150 may detect an abnormal state during the operation of the light source unit 110. If the abnormal state detection unit 150 detects an abnormal state, it can output a low level control signal. The low level control signal output from the first protection circuit unit 140 is a signal for operating the first protection circuit unit 140. For example, the first protection circuit unit 140 may include at least one switching The switching element of the first protection circuit unit 140 may include The abnormal state detector 150 turns on the abnormal state detector 150 in response to a low level control signal. The switching element of the first protection circuit unit 140 can operate in a turned-on state. A switching element that constitutes the constant current driver 120 by operating in an on-state The constant current driver 120 can be turned off. The switching element operates in a turn-off state, and the operation of the light source unit 110 is stopped. can be.

[0058] The specific circuit configuration of the light source driving device and the connection relationship therebetween will be described below. I decided to do so.

[0059] FIG. 3 is a circuit diagram specifically showing the light source driving device shown in FIG. 1, and FIG. 4 is a circuit diagram specifically showing the light source driving device shown in FIG. 5 is a diagram showing an example of the operation of the light source unit shown in FIG. 1. FIG. 6 is a circuit diagram specifically showing the detecting unit, and FIG. 7 shows the operating waveforms of the light source driving device according to the embodiment. This is a drawing.

[0060] Referring to FIG. 3, the light source unit 110 can be divided into a plurality of channels. For example, the light source unit 110 includes a first light source unit 111 and a second light source unit 112 which are divided into different channels. The different channels may include a first light source unit 112 and a second light source unit 113. Each of the divided light source units may include at least one light emitting diode. In this embodiment, the first light source unit 111, the second light source unit 112, and the third light source unit 113 Although the figures show each of the LEDs including two LEDs, the present invention is not limited to this. For example, at least one of the first light source unit 111, the second light source unit 112, and the third light source unit 113 At least one of the light emitting diodes may contain only one light emitting diode, and the other may contain three or more light emitting diodes. A diode may also be included.

[0061] The constant current driver 120 includes a switching element. Each channel may include a switching element connected to an output terminal of the light source unit. For example, the constant current driver 120 is connected to the output terminal of the first light source 111. The constant current driver 120 may include a switching element Q1. The light source unit 112 may include a second switching element Q2 connected to an output terminal of the light source unit 112. The constant current driver 120 includes a third switch connected to the output terminal of the third light source 113. A switching element Q3 may be included.

[0062] The first switching element Q1 selectively performs a switching operation to switch the first light source unit A constant current can be supplied to the first switching element 111. The first transistor may include, but is not limited to, a pn-type transistor. The collector terminal of the switching element Q1 is connected to the output terminal of the first light source unit 111. In addition, the emitter terminal of the first switching element Q1 is connected to ground. The base terminal of the first switching element Q1 is connected to the output terminal of the first protection circuit unit 140. The base terminal of the first switching element Q1 is connected to the drive control unit 1. 30. Therefore, the first switching element Q1 is The drive control unit 130 applies a switching signal to the turn-on or In addition, the first switching element Q1 can be turned off in the abnormal state. Under abnormal operating conditions, a signal output from the first protection circuit unit 140 is generated. The turn-off operation can be performed based on this.

[0063] The second switching element Q2 selectively performs a switching operation to switch the second light source unit A constant current can be supplied to the second switching element Q2. The collector terminal is connected to the output terminal of the second light source unit 112. The emitter terminal of the switching element Q2 is connected to the ground. The base terminal of the switching element Q2 is connected to the output terminal of the first protection circuit unit 140. The base terminal of the second switching element Q2 is connected to the driving control unit 130. As a result, the second switching element Q2 operates in the normal operating condition. It performs turn-on or turn-off operation based on the switching signal applied from In addition, the second switching element Q2 can be turned on when an abnormal operating condition occurs. In this case, the turn-off operation is performed based on the signal output from the first protection circuit unit 140. It is possible.

[0064] The third switching element Q3 selectively performs a switching operation to switch the third light source unit A constant current can be supplied to the third switching element Q3. The collector terminal is connected to the output terminal of the third light source unit 113. The emitter terminal of the switching element Q3 is connected to ground. The base terminal of the switching element Q3 is connected to the output terminal of the first protection circuit unit 140. In addition, the base terminal of the third switching element Q3 is connected to the driving control unit 130. As a result, under normal operating conditions, the third switching element Q3 130, which performs a turn-on or turn-off operation based on a switching signal applied thereto. In addition, the third switching element Q3 can be turned on when an abnormal state occurs. In an operating condition, the first protection circuit 140 is turned off based on a signal output from the first protection circuit 140. It can perform actions.

[0065] Meanwhile, the driving control unit 130 includes a first resistor R1, a second resistor R2, and a third resistor R3. The first resistor R1 is connected between the emitter terminal of the first switching element Q1 and ground. The second resistor R2 is disposed between the emitter terminal of the second switching element Q2 and The third resistor R3 is connected between the emitter of the third switching element Q3 and ground. It is placed between the end and ground.

[0066] On the other hand, the first protection circuit unit 140 includes a plurality of resistors, capacitors, Zener diodes, and diodes. For example, the first protection circuit unit 140 may include a diode and a switching element. , a third switching element Q4, a fifth switching element Q5, a first Zener diode ZD 1, diode, first capacitor C1, fourth resistor R4, fifth resistor R5, sixth resistor R6, A seventh resistor R7, an eighth resistor R8 and a ninth resistor R9 may be included.

[0067] The cathode terminal of the first Zener diode ZD1 is connected to the output terminal of the constant current input section 100a and the The anode of the first Zener diode ZD1 is connected between the input terminal of the light source unit 110. The terminal is connected to one terminal of the fourth resistor R4.

[0068] A fourth resistor R4 has one end connected to the anode end of the first Zener diode ZD1, The other end is connected to one end of a fifth resistor R5.

[0069] One end of a fifth resistor R5 is connected to the other end of the fourth resistor R4, and the other end of the fifth resistor R5 is connected to the fourth switch The sixth resistor R6 is connected to the base of the sixth resistor Q4.

[0070] The sixth resistor R6 has one end connected to the base of the fourth switching element Q4 and the other end connected to the fifth resistor R5. The other end is connected to ground.

[0071] The seventh resistor R7 has one end connected to the output terminal of the abnormal state detector 150 and the other end connected to the eighth resistor R 8 and the base of the fifth switching element Q5.

[0072] An eighth resistor R8 has one end connected to the other end of the seventh resistor R7 and the other end of the fifth switching element Q5. The other end is connected to the base and the other end is connected to ground.

[0073] The ninth resistor R9 has one end connected to the input terminal of the light source unit 110 and the other end connected to the anode of the diode. It is connected to the end of the wire.

[0074] The fourth resistor R4, fifth resistor R5, sixth resistor R6, seventh resistor R7, and eighth resistor R The eighth and ninth resistors R9 are provided to ensure the reliability of the operation of the elements constituting the first protection circuit unit 140. For example, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a The eighth resistor R8 and the ninth resistor R9 can reduce the current or voltage at the location where they are placed. can.

[0075] Meanwhile, the fourth switching element Q4 of the first protection circuit unit 140 has a base terminal connected to the fifth resistor For example, the fourth switching element R5 is connected between the other end of the fourth switching element R5 and one end of the sixth resistor R6. The base terminal of Q4 is connected to the first Zener diode via a fourth resistor R4 and a fifth resistor R5. The collector terminal of the fourth switching element Q4 is connected to the anode terminal of the fourth switching element Q5. The collector of the fourth switching element Q4 is connected to the constant current driver 120. The terminal is connected to the base terminal of the switching element constituting the constant current driver 120. For example, the collector terminal of the fourth switching element Q4 is connected to the base terminal of the first switching element Q1. the base of the second switching element Q2 and the base of the third switching element Q3. Each is connected.

[0076] The base terminal of the fifth switching element Q5 is connected to one end of the eighth resistor R8 and one end of the seventh resistor R7. Specifically, the base terminal of the fifth switching element Q5 is connected to the other end of the seventh resistor Q1. The fifth switch is connected to the output terminal of the abnormal state detector 150 via resistor R7. The switching element Q5 receives the first control signal C outputted through the output terminal of the abnormal state detector 150. It is turned on or off based on S1 and / or the second control signal CS2.

[0077] The collector terminal of the fifth switching element Q5 is connected to the other end of the ninth resistor and the The emitter terminal of the fifth switching element Q5 is connected to the ground. are linked.

[0078] The anode terminal of the diode is connected to the other terminal of the ninth resistor R9 and the fifth switching element The cathode is connected to the base of the fourth switching element Q4. can be.

[0079] The first capacitor C1 has one end connected to the base terminal of the fourth switching element Q4 and the fifth resistor Q5. The other end of resistor R5 is connected to one end of the sixth resistor R6 and the cathode of the diode. The end is connected to ground.

[0080] Meanwhile, the light source driving device as described above includes a tenth resistor R10 and an eleventh resistor R11. The tenth resistor R10 is connected between the constant current input unit 100a and the light source unit 110. The eleventh resistor R11 is disposed between the input terminal of the light source unit 110 and the constant voltage It is disposed between the flow drivers 120.

[0081] Under normal operating conditions, the light source driving device described above receives a constant current from the constant current input section 100a. When a constant current is applied, the applied constant current is applied to the light source unit 110. For example, When the light source unit 110 is configured with three channels, the three channels have the following characteristics: The constant current is applied to each of the electrodes in a uniformly distributed manner. When the current is 1A, each of the three channels of light sources is supplied with a constant current of 1 / 3A. Then, the constant current driver 120 applies the This allows for switching on and off of the constant current. Under the normal operating conditions as described above, a constant current is applied to the light source unit 110. The light emitting operation can be performed by a constant current supplied.

[0082] Meanwhile, the first protection circuit unit 140 detects an abnormal state during operation of the light source unit 110. When the constant current driver 120 is turned on, the switching element of the constant current driver 120 is turned off. It can be done.

[0083] For example, the first protection circuit unit 140 operates when the light source unit 110 is open. That is, the light source unit 110 is configured with a plurality of channels, and the plurality of When the light source unit corresponding to any one of the channels is open, The first protection circuit unit 140 starts operating.

[0084] For this purpose, the first Zener diode ZD1 of the first protection circuit unit 140 is The cathode terminal is connected to the input terminal of the light source unit 110. At this time, the state of the light source unit 110 is normal. In this case, the input terminal of the light source unit 110, for example, the cathode of the first Zener diode ZD1 A first voltage is applied to the terminals of the light source unit 110. If an open circuit occurs in the light-emitting diode of at least one channel, A second voltage greater than the first voltage is applied to the cathode terminal of the first Zener diode ZD1. It will take time.

[0085] When the first voltage is applied to the cathode terminal of the first Zener diode ZD1, The first Zener diode ZD can be maintained in a turned-off state. 1 selectively turns on when the voltage applied to the cathode terminal increases. The first Zener diode ZD1 applies a voltage equal to or higher than a preset threshold voltage to the cathode terminal. For example, the first Zener diode ZD1 is The transistor is turned on when a second voltage higher than the first voltage is applied to the cathode terminal.

[0086] Meanwhile, the fourth switching element Q4 is turned on under the condition that the light source unit 110 operates in the normal state. The fourth switching element Q4 is turned off at the light source unit 110. For example, the fourth switch The switching element Q4 is turned on when the first Zener diode ZD1 is turned off. In addition, the fourth switching element Q4 can maintain the light source As the voltage at the input terminal of the unit 110 rises, the first Zener diode ZD1 turns on. When the first Zener diode ZD1 is turned on, the first Zener diode ZD2 is turned on in conjunction with the switching operation of the first Zener diode ZD1. At this time, the collector terminal of the fourth switching element Q4 is connected to the constant current driver That is, the collector terminal of the fourth switching element Q4 is connected to the constant current The driver 120 includes a first switching element Q1, a second switching element Q2, and a third switching element Q3. The fourth switching element Q1 is connected to the base terminal of the fourth switching element Q2. When the switching element Q4 is turned on, the first switching element Q1 and the second switching element Q2 are turned on. The first switching element Q2 and the third switching element Q3 are turned off. The first switching element Q1, the second switching element Q2, and the third switching element Q3 are turned on. By turning it off, the current applied to the light source unit 110 is cut off.

[0087] As described above, the first protection circuit unit 140 in this embodiment is connected to the input terminal of the light source unit 110. The first Zener diode ZD1 is connected to the first Zener diode ZD 1 is a turn-on signal in response to an opening of a specific channel of the light source unit 110. The fourth switch 110 can detect an abnormal state of the light source unit 110. The sensing element Q4 detects an abnormal state caused by the first Zener diode ZD1 being turned on. When the constant current driver 120 is turned on, the constant current driver 120 can be turned off.

[0088] Meanwhile, the first protection circuit unit 140 is connected to the abnormal state detection unit 150 as described above. The connecting end is connected to the fifth switch through the seventh resistor R7. The base end of the switching element Q5 is connected to the

[0089] At this time, the fifth switching element Q5 maintains a turned-on state under normal operating conditions. The fifth switching element Q5 is connected to the abnormal state detector 150. When a control signal corresponding to the detection of a specific abnormal state is transmitted, the device can perform a turn-off operation. For example, the abnormal state detector 150 may set the first level when the light source driving device is operating normally. When the light source driving device is operating abnormally, a second level control signal is output. The fifth switching element Q5 can then supply the different When a first level control signal is input from the normal state detector 150, the turn-on state is maintained. Alternatively, the fifth switching element Q5 may be connected to the input terminal When a second level control signal is input from the abnormal state detector 150 via is changed to the off state.

[0090] At this time, when the fifth switching element Q5 is turned off, the constant voltage The current applied from the current driver 120 passes through the ninth resistor R9 and the diode to the fourth switch. The fourth switching element Q4 is connected to the ninth resistor Q1. It is turned on by the current applied through resistor R9 and the diode. The switching element Q4 operates in a turned-off state before the current is applied. When a current is applied, the fourth switch can operate in a turn-on state. When the fourth switching element Q4 is turned on, the The first switching element Q1, the second switching element Q2, and the The third switching element Q3 is turned off. When a second level control signal indicating an abnormal state is applied to the fifth switch 140, The switching of the constant current driver 120 is controlled through the fourth switching element Q4 and the fourth switching element Q5. In the embodiment, the light emitting element can be turned off. When the power source driving device operates in an abnormal state, the constant current driving unit 120 operates in a turn-off state. By doing so, the operation of the light source unit 110 can be stopped.

[0091] Meanwhile, the input terminal of the first protection circuit unit 140 is connected to a control circuit corresponding to the detection result of various abnormal conditions. A control signal is input.

[0092] For example, the input terminal of the first protection circuit unit 140 is connected to the open state of the light source unit 110 or The first abnormal state corresponds to a short circuit state, and the power supply to the drive control unit 130 is cut off. The corresponding second abnormal state corresponds to the case where the drive control unit 130 does not generate a clock signal. This may include a third abnormal condition in which

[0093] That is, the abnormal state detector 150 detects any of the abnormal states defined above. When an abnormal condition occurs, the second level control signal can be output. When the control signal of the second level is output, the fifth protection circuit 140 The switching element Q5 is turned off, and the fourth switching element Q4 is turned on. This stops the operation of the constant current driver 120 and the light source 110. .

[0094] The detailed configuration of the abnormal state detector 150 and the characteristics of the output of the second level control signal The symptoms will now be explained in more detail.

[0095] The abnormal condition detector 150 may include a plurality of AND gates. The abnormal state detector 150 includes a first AND gate 154 and a second AND gate 155. The output terminal OP1 of the first AND gate 154 and the output terminal OP2 of the second AND gate 155 can be The output terminals OP2 of the first protection circuit unit 140 are connected to the input terminals of the first protection circuit unit 140. For example, The first AND gate 154 logically converts the signals input via the input terminals IP1 and IP2 into and outputs a first control signal corresponding to the logical AND operation result. The ND gate 155 performs a logical AND operation on the signals input via the input terminals IP3 and IP4, and A second control signal corresponding to the result of the AND operation is output. A specific signal is input to the input terminals of the first AND gate 154 and the second AND gate 154. .

[0096] The first input terminal IP1 of the first AND gate 154 receives the power signal of the drive control unit 130. For example, the first input terminal IP1 of the first AND gate 154 receives the previous signal PSS. The power supply signal PSS terminal 151 is connected to the drive control unit 130 .

[0097] The second input terminal IP2 of the first AND gate 154 is connected to the clock signal of the driving control unit 130. For example, the second input terminal IP2 of the first AND gate 154 receives the clock signal CLKS. The clock signal CLKS terminal 152 of the driving control unit 130 is connected to the CLKS terminal 152 .

[0098] As a result, the first AND gate 154 receives the signal IP1 via the first input terminal IP1. and the power supply signal of the drive control unit 130 input through the second input terminal IP2. The first control signal can be output based on the clock signal of the control unit 130. For example, The first AND gate 154 receives the power signal of the drive control unit 130 and the power signal of the drive control unit 13 When a clock signal of 0 is input normally, a first control signal of a first level is output. In addition, the first AND gate 154 can receive the power signal of the drive control unit 130. and the clock signal of the drive control unit 130 are not input. In a normal state, the first control signal can be output at a second level. The first control signal is provided to the input terminal of the first protection circuit unit 140. For example, When a first control signal of a first level is output through the D gate 154, the first protection circuit The fifth switching element Q5 of the unit 140 can be maintained in a turned-on state. When the first control signal of the second level is output through the first AND gate 154, The fifth switching element Q5 of the first protection circuit unit 140 is changed to a turned-off state.

[0099] The third input terminal IP3 of the second AND gate 155 is connected to the power supply signal of the driving control unit 130. For example, the third input terminal IP3 of the second AND gate 155 receives the previous signal PSS. The power supply signal PSS terminal 151 is connected to the drive control unit 130 .

[0100] The fourth input terminal IP4 of the second AND gate 155 receives a state detection signal of the light source unit 110. For example, the fourth input terminal IP4 of the second AND gate 155 receives the light source The feedback signal of the sensing block that senses the state of the unit 110 is connected to the FS output terminal 153. For example, the fourth input terminal IP4 of the second AND gate 155 is The feedback terminal (not shown) of the separate control unit 270 is connected to the feedback terminal of the separate control unit 270. For example, The unit 270 detects the first light emitting diode through the first and second sensing units 230 and 240. The first light emitting diode 210 and the second light emitting diode 220 are detected to be in an open state or a short state. and inputs the received sensing signal to the fourth input terminal IP of the second AND gate 155. For example, the sensing signal may be provided to the first light emitting diode 210 and and a first sensing signal indicating that the second light emitting diodes 220 are all in a normal state; At least one of the first light emitting diode 210 and the second light emitting diode 220 may include a second sensing signal indicating that the

[0101] Meanwhile, the second AND gate 155 receives the driving voltage inputted through the third input terminal IP3. The power signal of the control unit 130 and the state of the light source unit 110 input through the fourth input terminal IP4 are input. The second control signal may be output based on the sensing signal. The port 155 transmits a power supply signal to the drive control unit 130 and an individual control unit 270 of the light source unit 110. and outputting a second control signal of a first level under a condition that a first sensing signal is input from the In addition, the second AND gate 155 determines whether the power supply signal of the drive control unit 130 is normal. The second sensing signal is not inputted directly from the individual control unit 270 of the light source unit 110. A control signal of the second level can be output under the condition that the first level The second control signal or the second control signal at the second level is input to the first protection circuit unit 140. For example, the second control of the first level is provided via the second AND gate 155. When a signal is output, the fifth switching element Q5 of the first protection circuit unit 140 turns on. For example, the second level can be maintained in an ON state through the second AND gate 155. When the second control signal of the fifth protection circuit unit 140 is output, the fifth switching element The child Q5 is changed to the turn-off state.

[0102] As described above, in this embodiment, various abnormalities of the light source driving device are detected through the abnormal state detector 150. In addition, in this embodiment, the first protection circuit unit 140 can detect the abnormal state. In the embodiment, the operation of the light source unit 110 can be stopped by detecting the state of the light source unit 110. Based on the detection signal detected by the light source unit 110, the light source unit 110 is turned on or off. The first Zener diode ZD1 can be used to sense the ON / OFF state. It is also possible to directly perform a protection operation corresponding to the open state of the light source unit 110 through the above. That is, as described above, the light source unit 110 may or may not have an animation function. If the light source unit 110 does not have an animation function, The light source unit 110 does not include the individual switches, sensing units, and individual control units described above. In this case, the first Zener diode ZD1 is connected to the input of the light source unit 110. The light source unit 110 is selectively turned on in response to the voltage applied to the terminal. The constant current driver 120 and the light source 110 can be stopped from operating.

[0103] Meanwhile, referring to FIG. 6, in the embodiment, the first control signal and the second control signal are output in response to the output of the first control signal and the second control signal. The current or voltage applied to the light source unit 110 changes. The waveform B shows the magnitude of the current output from the first AND gate 154. 15 shows the first control signal output from the second AND gate 155. 10 shows a second control signal to be input.

[0104] For example, in the embodiment, in the first section TS1 between the initial time point T0 and the first time point T1, The control signal CS1 maintains the first level corresponding to the high level, and the second control signal CS2 maintains the high level. The first control signal CS1 can maintain a second level corresponding to the first level. When the second control signal CS2 is maintained at a high level, the light source unit 110 is in normal operation. That is, when the light source unit 110 is in a normal state, the driving control unit The power supply signal is normally input to the drive control unit 130, and the clock signal is normally output from the drive control unit 130. When the first control signal CS1 and the second control signal CS2 are both at a high level, As a result, the constant current driver 120 operates normally under the above conditions. As a result, a constant current is supplied to the light source unit 110.

[0105] Meanwhile, in the embodiment, the first control signal CS1 is at a high level at the first time point T1. For example, at the first time point T1, the signal supplied to the drive control unit 130 is changed to a low level. An abnormality may occur in the power supply signal output from the drive control unit 130 or the clock signal output from the drive control unit 130. In this case, the first AND gate 154 determines the level of the first control signal. The first control level can be changed to a second level (for example, a low level). When the level of the signal CS1 is changed from a high level to a low level, the first protection circuit For example, when the level of the first control signal CS1 changes to a low level, the operation of 140 is started. As a result, the fifth switching element Q5 is turned off, and the fourth switching element Q The switching element Q4 is turned on, and the constant current driver 120 is changed to an off state. As a result, the light emission operation of the light source unit 110 can also be stopped. The unit 110 detects a current during a second section TS2 corresponding to the first time point T1 to the second time point T2. may not be supplied.

[0106] Meanwhile, in the embodiment, the first control signal CS1 is at a low level at the second time point T2. For example, at the second time point T2, the signal supplied to the drive control unit 130 is changed from high to low. A power signal that was not supplied or a clock signal that was not output from the drive control unit 130 In this case, the first AND gate 154 returns to the normal state. The level of the first control signal is changed to a high level again. is changed to a high level, the constant current driver 120 restarts its operation, and A constant current is supplied to the light source unit 110 under the control of the constant current driver 120. The light source unit 110 turns on at a second time point when both the first control signal and the second control signal are maintained at a high level. During the third section TS3 corresponding to the period from T2 to the third time point T3, normal operation is possible. .

[0107] On the other hand, in the embodiment, the second control signal CS2 is at a high level at the third time point T3. For example, at the third time point T3, the signal supplied to the drive control unit 130 is changed to a low level. The power signal is not supplied normally or an abnormal state is detected in the light source unit 110. In this case, the second AND gate 155 sets the level of the second control signal to The second control signal can be changed to a second level (for example, a low level). When the level of CS2 is changed from high to low, the first protection circuit unit 14 For example, when the level of the second control signal CS2 is changed to a low level, As a result, the fifth switching element Q5 is turned off, and the fourth switching element Q As a result, the constant current driver 120 is turned off. This also stops the light emission operation of the light source unit 110. 10, a current is supplied during a fourth section TS4 corresponding to the third time point T3 to the fourth time point T4. It does not have to be provided.

[0108] Meanwhile, in the embodiment, the second control signal CS2 is at a low level at the fourth time point T4. For example, at the fourth time point T4, the signal supplied to the drive control unit 130 is changed from high to low. The power signal that was not supplied is supplied again, or the light source unit 110 returns to a normal state. In this case, the first AND gate 154 sets the level of the first control signal to The first control signal is changed from a low level to a high level. , the constant current driver 120 restarts its operation, and the constant current driver A constant current is supplied to the light source unit 110 under the control of 120. The first control signal and the second control signal are both maintained at a high level from a fifth time point T5. During the fifth section TS5 until the level of the first control signal or the second control signal is changed, It can operate normally.

[0109] FIG. 7 is a block diagram showing the configuration of a light source driving device according to another embodiment, and FIG. 7 is a circuit diagram specifically showing the light source driving device shown in FIG.

[0110] Referring to FIG. 7, the light source driving device of another embodiment includes a light source unit 110, a constant current driving unit 120, and a , a drive control unit 130, an abnormal state detection unit 150, and a second protection circuit unit 160. The light source unit 110, the constant current driver 120, the drive controller 130, and the abnormality state controller 140 shown in FIG. The state detector 150 is substantially the same as that shown in FIG. We will give it the same fail rating and omit detailed explanation.

[0111] The first protection circuit unit 140 in FIG. 3 is connected to the input terminal of the constant current input unit 100a and the light source unit 110. and controls the operation of the constant current driver 120 and the light source 110.

[0112] Alternatively, the second protection circuit unit 160 is disposed at the output end of the light source unit 110 . The second protection circuit unit 160 is connected to the abnormal state detection unit 150, thereby detecting the abnormal state. The normal state detector 150 provides a first control signal and a second control signal. The protection circuit unit 160 protects at least one of the first and second control signals. When the level of the signal is at a second level (for example, a low level), the constant current driver is activated. The operation of the power supply 120 and the light source 110 can be stopped.

[0113] The second protection circuit unit 160 includes a twelfth resistor R12, a thirteenth resistor R13, and a fourteenth resistor R1 4. Second Zener diode ZD2, sixth switching element Q6, seventh switching element The sixth switching element Q6 may include a sixth switching element Q7 and an eighth switching element M1. The seventh switching element Q7 may be a transistor. The switching element M1 is a MOSFET (Metal Oxide Semiconductor Field Effect Transistor). For example, the eighth switch may be a field effect transistor. The switching element M1 may be a P-type MOSFET, but is not limited to this. stomach.

[0114] The twelfth resistor R12 has one end connected to the output terminal of the abnormal state detector 150 and the other end connected to the The sixth switching element Q6 is connected to the base terminal of the sixth switching element Q6 and one terminal of the second capacitor C2.

[0115] The thirteenth resistor R13 has one end connected to the output terminal of the light source unit 110 and the other end connected to the seventh switch. The collector terminal of the eighth switching device Q7 is connected to the gate terminal of the eighth switching device M1.

[0116] The fourteenth resistor R14 has one end connected to the output terminal of the light source unit 110 and the other end connected to the output terminal of the Zener diode ZD1. The other end is connected to the base terminal of the sixth switching element Q6 and the seventh switching element Q7. The resistor R2 is connected to the base end of the resistor Q7.

[0117] The sixth switching element Q6 has a collector terminal connected to the base terminal of the seventh switching element Q7. The base terminal is connected to the other end of the 12th resistor R12 and the second capacitor R14. The emitter terminal is connected to one end of the capacitor C2, and the emitter terminal is connected to ground.

[0118] The seventh switching element Q7 has a collector terminal connected to the gate terminal of the eighth switching element M1. The base terminal is connected to the collector terminal of the sixth switching element Q6, and the emitter terminal is connected to Connected to the earth.

[0119] The eighth switching element M1 has a source terminal connected to the output terminal of the light source unit 110 and a gate terminal is connected to the other end of the resistor R13, the anode end of the second Zener diode ZD2, and the The collector terminal of the switching element Q7 is connected to the collector terminal of the switching element Q7, and the drain terminal is connected to the ground.

[0120] The second Zener diode ZD2 has a cathode terminal connected to the output terminal of the light source unit 110 and a thirteenth resistor. The anode terminal of the seventh switching element R11 is connected to one end of the resistor R13 and one end of the fourteenth resistor R14. The collector terminal of the device Q7 is connected to the gate terminal of the eighth switching device M1.

[0121] The second capacitor C2 has one end connected to the other end of the twelfth resistor R12 and the sixth switching The other end is connected to the base of element Q6 and is grounded.

[0122] The second protection circuit unit 160 configured as above operates as follows.

[0123] The second protection circuit unit 160 receives the first control signal CS1 and the second control signal CS2 from the abnormal state detection unit 150. A second control signal CS2 is provided. For example, the first control signal CS1 may be As such, it can include a first control signal of a first level and a first control signal of a second level. In addition, the second control signal CS2 is a first level second control signal and a second level second control signal. It may contain a number.

[0124] The second protection circuit unit 160 controls the first control signal CS1 and the second control signal CS When the level of at least one of the two control signals is the second level (or low level), When the constant current driver 120 and the light source 110 are turned on, the constant current driver 120 and the light source 110 are stopped. can be done.

[0125] Meanwhile, the first control signal CS1 and the second control signal CS2 are both at the first level (or high level). When the sixth switching element Q6 is in a turned-on state, the seventh switching element Q7 is in a turned-on state. The eighth switching element Q7 is turned off and the eighth switching element M1 is turned off. At this time, since the eighth switching element M1 is in a turned-off state, the constant The constant current applied from the current input unit 100a is controlled by the constant current driving unit 120. The light sources 110 are respectively applied with the respective signals.

[0126] Meanwhile, at least one of the first control signal CS1 and the second control signal CS2 When the level of the control signal is at the second level (or low level), the sixth switching element The seventh switching element Q6 is turned off, and the seventh switching element Q7 is turned on. At this time, the seventh switching element Q7 is turned on. In response to this, the eighth switching element M1 is also turned on. When the switching element M1 is turned on, the light source unit 110 operates in a short-circuit state. For example, when the eighth switching device M1 is turned on, the light source unit 1 The anode and cathode terminals of the light-emitting diode 10 are short-circuited. Therefore, the current applied from the constant current input unit 100a is not applied to the light source unit 110. , can flow through the eighth switching element M1. 110 can stop the lighting operation.

[0127] According to the above, the second protection circuit unit 160 is a switch that constitutes the constant current driver 120. The light emitting operation of the light source unit 110 is stopped without changing the switching state of the light emitting element. This is because the second protection circuit unit 160 is connected to the input terminal of the light source unit 110. This is because the output terminal is connected to the output terminal.

[0128] As described above, in the embodiment, depending on the arrangement state of the light source unit 110 constituting the light source driving device, At least one of the first protection circuit unit 140 and the second protection circuit unit 160 is protected. A protection circuit can be applied to stop the light emission of the light source unit 110.

[0129] For example, the light source unit 110 is configured with a plurality of channels, and the plurality of channels are Different lamps may be configured in the vehicle. For example, the light source unit 110 may be configured as follows: Some of the multiple channels can be applied to vehicle taillights, and others can be applied to directional indicators. Some of them can be applied to indicator lights, and some of them can be applied to brake lights.

[0130] In this case, the light source driving device includes a plurality of circuit boards that are separated from each other, The light source units 110 of the multiple channels are arranged in a separated manner on the circuit board. At this time, the plurality of circuit boards are connected to each other via connecting members such as wires. Meanwhile, the first protection circuit unit 140 is configured to protect one of the plurality of light sources. At this time, the first protection circuit is disposed on the circuit board on which the other circuits are disposed. The operation of the light source part on the board can be controlled through limited control pins. This may cause problems in operational reliability. The first protection circuit unit 140 and the second protection circuit unit 160 are connected in accordance with the arrangement of the light source unit 110. The operation of the light source unit 110 can be controlled by using at least one of the protection circuits. Make it possible.

[0131] FIG. 9 is a circuit diagram specifically showing a light source driving device according to still another embodiment.

[0132] Referring to FIG. 9, the light source driving device includes a constant current input unit 100a, a light source unit 110, a constant current drive unit 111, a constant current input unit 112, a constant current drive unit 113, a constant current input unit 114, a constant current input unit 115, a constant current drive unit 116, a constant current input unit 117, a constant current input unit 118, a constant current drive unit 119, a constant current input a driving unit 120, a driving control unit 130, a first protection circuit unit 140, an abnormal state detection unit 150, and a second A protection circuit unit 160 may be included.

[0133] That is, the light source driving device in the embodiment includes the first protection circuit unit 140 shown in FIG. 3 and the 8. Therefore, in the embodiment, The first protection circuit unit 140 and the second protection circuit unit 160 are used to adjust the light source unit 110 depending on the situation. The control operation can be performed.

[0134] For example, in the embodiment, under the first condition, the first protection circuit unit 140 is used to protect the light In the embodiment, the operation of the source unit 110 can be controlled under the second condition. The operation of the light source unit 110 can be controlled using the protection circuit unit 160.

[0135] For example, the abnormal state detector 150 includes a first AND gate 154 and a second AND gate 155. It may contain 155.

[0136] Then, either the first AND gate 154 or the second AND gate 155 The output terminal of one AND gate is connected to the first protection circuit unit 140. The other one of the first AND gate 154 and the second AND gate 155 The output terminal is connected to the second protection circuit unit 160. For example, the first protection circuit unit 140 is connected to the output terminal of the first AND gate 154. 0 is connected to the output terminal of the second AND gate 155. In this case, the first The protection circuit unit 140 receives the first control signal CS1 output from the first AND gate 154. In addition, the second protection circuit unit 160 receives the signal output from the second AND gate 155. Therefore, the first protection circuit unit 140 receives the second control signal CS2. The first control signal of the first level or the first control signal of the second level output from the AND gate 154 The first protection circuit unit 140 can receive the second level control signal. When the first control signal is received, the constant current driver 120 and the light source 1 are activated. The second protection circuit unit 160 can stop the operation of the second A10. The second control signal of the first level or the second control signal of the second level output from the ND gate 155 The second protection circuit unit 160 can receive the second level signal. When a second control signal is received, the control signal is activated to short the light source unit 110. 8, the current can be controlled to flow via the switching element M1.

[0137] In the embodiment, the operational reliability of the light source unit can be improved. The power supply may include a first protection circuit disposed at an input end of the power supply, the first protection circuit comprising: An abnormal state of the light source unit, an abnormal state of the power supply to the drive control unit, and When an abnormal state of the clock signal is detected, the light source unit is activated to emit light. As a result, in the embodiment, the previous operation can be stopped in various abnormal situations such as those described above. This can solve the reliability problem that may occur due to the continued operation of the light source unit. This makes it possible to protect the circuits that make up the light source driving device.

[0138] FIG. 10 is a top view of a vehicle to which a lamp having a light source driving device according to an embodiment is applied. 11 shows an example in which the light source driving device according to the embodiment is disposed in the front of a vehicle, and FIG. 12 shows an example in which the light source driving device according to the embodiment is disposed in the front of a vehicle. 1 is an example in which the lighting driving device according to the embodiment is disposed at the rear of a vehicle.

[0139] 10 to 12, the lighting driving device according to the embodiment is configured to drive a lamp of a vehicle 2000. The lamps may be positioned at least in the front, rear, and sides of the vehicle 2000. The lighting driving device is provided in various shapes such as curved lines and straight lines. and can be applied to lamps arranged in various areas of the vehicle 2000.

[0140] For example, referring to FIG. 11, the lamp may be a front lamp 2100 of a vehicle 2000. The front lamp 2100 includes a first cover member 2110 and the lighting The first lamp module may include at least one lamp module including the device 1000. The bar member 2110 can house the lighting driver.

[0141] The front lamp 2100 includes at least one lamp module and a lighting driver. By controlling the timing of the operation of the front lamp 2, multiple functions can be provided. 100 is a headlight, a turn signal lamp, a Provides at least one of the following functions: daytime running lights, high beam, low beam, and fog lights. The lamp module may include a first lamp module 2120 and a third lamp module 2130. In addition, the front lamp 2100 lights up the welcome light when the driver opens the vehicle door. Additional features such as mullite or celebration effects It can even provide Noh performances.

[0142] Also, referring to FIG. 12, the lamp may be applied to a rear lamp 2200 of a vehicle. The rear lamp 2200 includes a second cover member 2210 and the lighting driving device. The second cover member 221 may include at least one lamp module including: 0 can accommodate the lighting driving device.

[0143] The rear lamp 2200 includes a light source driver included in at least one lamp module. The activation time can be controlled to provide multiple functions. For example, the rear lamp 2200 The light source unit 110 of the light source driving device emits light to illuminate the side lamps, brake lamps, and turn signal lamps. A second lamp module 2220 may be included to provide at least one function.

[0144] In the embodiment, the operational reliability of the light source unit can be improved. The power supply may include a first protection circuit disposed at an input end of the power supply, the first protection circuit comprising: An abnormal state of the light source unit, an abnormal state of the power supply to the drive control unit, and When an abnormal state of the clock signal is detected, the light source unit is activated to emit light. As a result, in the embodiment, the previous operation can be stopped in various abnormal situations such as those described above. This can solve the reliability problem that may occur due to the continued operation of the light source unit. This makes it possible to protect the circuits that make up the light source driving device.

[0145] The features, structures, effects, etc. described in the above embodiments may be applied to at least one embodiment of the present invention. The present invention is not limited to any one embodiment. The features, structures, effects, etc. of the present invention may be easily understood by a person having ordinary skill in the art to which the present invention pertains. Therefore, the present invention relates to such combinations and modifications. The contents should be construed as falling within the scope of the present invention.

[0146] Although the above description has been centered on the examples, these are merely examples and do not limit the present invention. The present invention is not intended to be limited to the above embodiments, and a person having ordinary skill in the art to which the present invention pertains can easily understand the present invention. Various modifications and applications not exemplified above are possible within the scope of the essential characteristics. For example, each component specifically presented in the embodiment can be modified and implemented. The differences relating to such modifications and applications are within the scope of the present invention as defined in the appended claims. It should be construed as being within the scope of the invention.

Claims

1. A light source unit; a first switching element connected to the light source unit, a constant current driving unit that supplies a constant current to the light source unit based on a switching operation; a switching signal for controlling the first switching element constituting the constant current driving unit; a drive control unit that outputs the Detecting an abnormal state of the light source unit and an abnormal state of the drive control unit, and an abnormal state detection unit that outputs a control signal; The constant current driver is selectively operated based on a control signal output from the abnormal state detector. a protection circuit for stopping the operation of the light source; and

2. a first protection circuit connected to an input terminal of the light source unit and a second protection circuit connected to an output terminal of the light source unit; The light source driving device according to claim 1 , further comprising at least one second protection circuit unit.

3. The first protection circuit unit a control signal output from the abnormal state detection unit, the control signal being connected to the abnormal state detection unit; a second switching element that performs a switching operation; a switching element connected to the second switching element, the switching element 3. The light source driver according to claim 2, further comprising a third switching element that performs a switching operation based on motion device.

4. The second switching element has a first base terminal connected to the abnormal state detector and a The light source includes a first collector terminal connected to an input terminal of the light source unit and a first emitter terminal connected to a ground. 、 The third switching element is connected to the first collector terminal of the second switching element. a second base connected to the first switching element; and a second collector connected to the first switching element.

4. The light source driving device of claim 3, further comprising a first emitter end coupled to a first emitter end and a second emitter end coupled to ground.

5. the second switching element is turned on when the control signal is at a first level; When the control signal is at a second level, it turns off; The third switching element is turned off when the control signal is at the first level. and when the control signal is at the second level, it turns on; When the third switching element is turned on, the first switching element The light source driving device according to claim 4 , wherein the light source driving device maintains the turned-off state.

6. The first protection circuit has a first cathode terminal connected to an input terminal of the light source unit, and a first Zener diode having an anode connected to the second base of the switching element; The light source driving device of claim 4 .

7. The first Zener diode is connected to the input terminal of the light source unit when a second voltage higher than the first voltage is applied to the input terminal of the light source unit. At that point, it turns on The third switching element is configured to turn on the first Zener diode. The state is changed to the turn-on state as shown below. When the third switching element is turned on, the first switching element The light source driving device according to claim 6 , wherein the light source driving device maintains the turned-off state.

8. The second protection circuit unit a control signal output from the abnormal state detection unit, the control signal being connected to the abnormal state detection unit; a fourth switching element that performs a switching operation; a switching element connected to the fourth switching element, the switching element being configured to switch the fourth switching element; a fifth switching element that performs a switching operation based on the a switching element connected to the fifth switching element, for switching the fifth switching element; and a sixth switching element that performs a switching operation based on Source drive device.

9. The fourth switching element has a third base connected to the abnormal state detector and a third collector terminal connected to the fifth switching element and a third emitter terminal connected to ground; Including, The fifth switching element is connected to the third collector terminal of the fourth switching element. a fourth base terminal connected to the output terminal of the light source unit and the sixth switching element; a fourth collector end and a fourth emitter end coupled to ground; The sixth switching element has a source terminal connected to an output terminal of the light source unit and a The gate terminal of the switching element is connected to the fourth collector terminal, and the drain terminal is connected to the ground. The light source driving device of claim 8 , further comprising an in end.

10. the fourth switching element is turned on when the control signal is at a first level; When the control signal is at a second level, it turns off; The fifth switching element is turned off when the control signal is at the first level. and when the control signal is at the second level, it turns on; The sixth switching element is turned off when the control signal is at the first level. and when the control signal is at the second level, it turns on; When the sixth switching element is turned on, the current applied to the light source is The light source driving device according to claim 9 , wherein the current flows through a path including the sixth switching element. Place.

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