KR102050367B1 - Circuit topology of vehicle lamp - Google Patents

Abstract

The present invention discloses a vehicle lamp circuit topology. The vehicle lamp circuit topology according to the present invention includes a first light emitting module, a second light emitting module, and a light emitting module driver for supplying a driving voltage to at least one of the first light emitting module and the second light emitting module. Is a result of selecting a high beam or a low beam based on a combination of an input voltage unit receiving a voltage supplied from a vehicle, a regulator adjusting a voltage provided from the input voltage unit, and an output combination of the first light emitting module and the second light emitting module. Accordingly, the first switch may include a first switch for changing a converting mode of the light emitting module driver and a second switch switched on or off in correspondence with the converting mode.

Description

Circuit topology of vehicle lamp

The present invention relates to a vehicle lamp circuit topology, and more particularly, to a vehicle lamp circuit topology for improving the light emitting module driver for supplying a constant voltage to the light emitting module.

BACKGROUND ART In general, a vehicle includes various types of vehicle lamps having a lighting function for easily checking an object located around the vehicle at night and a signal function for notifying other vehicles or road users of the driving state of the vehicle.

For example, head lamps, fog lamps, and the like are mainly intended for lighting functions, and turn signal lamps, tail lamps, brake lamps, side markers, and the like are mainly intended for signal functions. In addition, such vehicle lamps are prescribed by law with respect to their installation standards and standards so as to fully exhibit their respective functions.

Among such vehicle lamps, the head lamp that ensures the driver's forward vision when the vehicle is driving at night or driving in a dark place such as a tunnel plays a very important role in safe driving.

In addition, due to the rapid development of LED (Light Emitting Diode), it is a trend that is widely used as a light source in the head lamp field of the vehicle.

For driving the light emitting module such as LED (Light Emitting Diode) of the vehicle, the light emitting module driver, which is a constant current supply module, is used.In particular, the low light and high beam require high light quantity, so the output power of the light emitting module driver is high Therefore, the difference in power consumption and heat generation occurs depending on the efficiency.

The light emitting module driver uses a buck, boost, or buck-boost topology of a DC / DC converter according to the configuration of a light emitting module such as a light emitting diode (LED). Recently, as the efficiency of automotive LEDs is improved and the number of LEDs constituting the low beam and the high beam is reduced, the frequency of using the buck-boost topology is increasing more than the existing boost topology. .

However, the buck-boost topology has a disadvantage in that power consumption and heat generation are high because efficiency is lower than that of the buck and boost topology. Therefore, there is a need for a method of improving the DC / DC converter configuration for designing a high efficiency light emitting module driver without flicker.

In addition, since the light emitting module driver corresponding to the low beam of the vehicle and the light emitting module driver corresponding to the high beam of the vehicle are separately provided, a plurality of light emitting module drivers for outputting the low beam or the high beam should be provided. There are also disadvantages. There is also a need for measures to improve this.

Japanese Unexamined Patent Publication No. 2010-272763 (2010.12.02)

Accordingly, an object of the present invention is to provide a vehicle lamp circuit topology for efficiently improving a light emitting module driver configuration for outputting a low beam or high beam of a vehicle. .

In addition, the present invention provides a vehicle lamp circuit topology that can actively change the DC / DC converter configuration for designing a high efficiency light emitting module driver.

The object of the present invention is not limited to the above-mentioned problems, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

The vehicle lamp circuit topology according to the first aspect of the present invention for achieving the above object is a light emitting for supplying a driving voltage to at least one of the first light emitting module, the second light emitting module and the first light emitting module and the second light emitting module. And a module driver, wherein the light emitting module driver includes an input voltage unit receiving a voltage supplied from a vehicle, a regulator for adjusting a voltage provided from the input voltage unit, and an output combination of the first light emitting module and the second light emitting module. And a first switch for changing the converting mode of the light emitting module driver and a second switch switched on or off in correspondence with the converting mode according to a result of selecting one of the plurality of modes based on.

The first light emitting module is connected to an output terminal of the regulator, and the second light emitting module is connected to an output terminal of the first light emitting module, the first switch, or a switch block including the first switch and the second switch. Can be connected.

The first light emitting module may correspond to a first mode of the plurality of modes, and the second light emitting module may correspond to the second mode.

The first mode may correspond to a low beam, and the second mode may correspond to a high beam.

The vehicle lamp circuit topology may further include a third light emitting module connected in parallel to the first light emitting module and a fourth light emitting module connected in parallel to the second light emitting module.

When the first light emitting module is turned on, the first switch is in an off state, and the second switch is in an on state.

When the first light emitting module and the second light emitting module are turned on, the first switch is in an on state, and the second switch is in an off state.

According to an operation combination of the first switch and the second switch, when the voltage is supplied to the first path for supplying the voltage to the first light emitting module, the light emitting module driver is in a buck boost converter mode.

According to an operation combination of the first switch and the second switch, when the voltage is supplied to a second path for supplying voltage to at least one of the first light emitting module and the second light emitting module, the light emitting module driver may boost. Converter mode.

In the converting mode of the light emitting module driver, a current may be supplied to any one of two output terminals of the first light emitting module according to the switching of the first switch.

When the first mode is selected, a leakage current block connected in parallel to the second light emitting module to lower the current flowing to the second light emitting module below a predetermined reference current in preparation for the current flowing to the first light emitting module. It may further include.

In addition, the vehicle lamp circuit topology according to the second aspect of the present invention for achieving the above object is to supply a driving voltage to at least one of the first light emitting module, the second light emitting module and the first light emitting module and the second light emitting module. And a light emitting module driver, wherein the light emitting module driver includes an input voltage unit for receiving a voltage supplied from a vehicle, a regulator for adjusting a voltage provided from the input voltage unit, the first light emitting module, and the second light emitting module. It may include a plurality of switches for selecting a specific path among the plurality of paths for supplying the voltage, or switch the selected specific path to another specific path.

The plurality of paths may include a first path for supplying voltage to the first light emitting module and a second path for supplying voltage to at least one of the first light emitting module and the second light emitting module.

The plurality of switches includes a first switch and a second switch, and when the voltage is supplied through the first path, the first switch is in an off state and the second switch is in an on state.

The plurality of switches includes a first switch and a second switch, and when the voltage is supplied through the second path, the first switch is in an on state and the second switch is in an off state.

In the converting mode of the light emitting module driver, a current may be supplied to one of the two output terminals of the first light emitting module according to the switching of the first switch.

When the first mode is selected, a leakage current block connected in parallel to the second light emitting module to lower the current flowing to the second light emitting module below a predetermined reference current in preparation for the current flowing to the first light emitting module. It may further include.

When the voltage is supplied through the first path, the light emitting module driver is in a buck boost converter mode.

When the voltage is supplied through the second path, the light emitting module driver is in a boost converter mode.

When the voltage is supplied through the first path, the first light emitting module may correspond to a low beam.

When the voltage is supplied through the second path, the first and second light emitting modules may correspond to a high beam.

The supply of voltage through the second path is more efficient than the supply of voltage through the first path.

Accordingly, in the present invention, there is an advantage in that it is possible to provide a vehicle lamp circuit topology capable of efficiently improving a light emitting module driver configuration for outputting a low beam or high beam of a vehicle.

In addition, the present invention has the advantage to provide a vehicle lamp circuit topology that can actively change the DC / DC converter configuration for designing a high efficiency light emitting module driver.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a block diagram showing a vehicle lamp according to an embodiment of the present invention.
FIG. 2 is a circuit diagram illustrating the vehicle lamp of FIG. 1 as an example.
3 is a circuit diagram illustrating a current flow in a first stage when the first switch of the light emitting module driver of FIG. 2 is switched to an on state.
FIG. 4 is a circuit diagram illustrating a current flow in a second stage when the first switch of the light emitting module driver of FIG. 2 is turned on.
FIG. 5 is a circuit diagram illustrating a current flow in a third stage when the first switch of the light emitting module driver of FIG. 2 is turned on.
6 is a circuit diagram illustrating another example of the vehicle lamp of FIG. 1.
7 is a circuit diagram illustrating a boost converter applied to the present invention.
8 is a circuit diagram illustrating a buck boost converter applied to the present invention.
9 is a table for comparing the converting modes of the present invention.
FIG. 10 is a graph showing the results of each step shown in FIGS. 3 to 5.
FIG. 11 is a circuit diagram illustrating a current flow in a first stage when the first switch of the light emitting module driver of FIG. 2 is turned off.
FIG. 12 is a circuit diagram illustrating a current flow in a second stage when the first switch of the light emitting module driver of FIG. 2 is turned off.
FIG. 13 is a circuit diagram illustrating a current flow in a third stage when the first switch of the light emitting module driver of FIG. 2 is turned off.
14 is a circuit diagram illustrating another example of the vehicle lamp of FIG. 1.
FIG. 15 is a circuit diagram illustrating another example of the vehicle lamp of FIG. 1.
FIG. 16 is a circuit diagram illustrating another example of the vehicle lamp of FIG. 1.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, and only the embodiments make the disclosure of the present invention complete, and the general knowledge in the art to which the present invention belongs. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

In addition, the embodiments described herein will be described with reference to cross-sectional and / or schematic views, which are ideal illustrations of the invention. Accordingly, shapes of the exemplary views may be modified by manufacturing techniques and / or tolerances. In addition, each component in each drawing shown in the present invention may be shown to be somewhat enlarged or reduced in view of the convenience of description.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a vehicle lamp according to an embodiment of the present invention.

As shown in FIG. 1, the vehicle lamp 100 supplies light to supply a constant voltage to the first light emitting module 110, the second light emitting module 120, and each light emitting module used as a light source to drive each light emitting module. Module driver 130.

The light emitting module driver 120 may include an input voltage unit Vin receiving a voltage supplied from a vehicle, a regulator 131 for adjusting a voltage provided from the input voltage unit, a first light emitting module 110, and a second light emitting module ( According to a result of selecting the high beam or the low beam based on the output combination of the 120, the first switch SW2 for changing the converting mode of the light emitting module driver 120 and the second switch switched on or off in correspondence with the converting mode. (SW3).

The first light emitting module 110 is connected to an output terminal of the regulator 131, and the second light emitting module 120 is an output terminal of the first light emitting module 110, a first switch SW2, or a first switch SW2. And a switch block including a second switch SW3.

Through the above circuit connection, the first light emitting module 110 may be provided to correspond to the low beam, and the second light emitting module 120 may be provided to correspond to the high beam.

When the first light emitting module 110 is turned on, the first switch SW2 is in an off state and the second switch SW3 is in an on state.

In addition, when both of the first light emitting module 110 and the second light emitting module 120 are turned on, the first switch SW2 is in an on state and the second switch SW3 is in an off state.

Here, the vehicle lamp 100 may include a head lamp that lights the front of the vehicle, but is not limited thereto and may be applied to other lamps. In the following description, a head lamp will be described in detail, but the present invention should not be interpreted as being limited to the head lamp.

In the field of vehicle headlamps, LEDs are currently being replaced by light emitting diodes (LEDs) in existing halogen and HID lamps, and LED headlamps are expanding from high-end trim models to popular-type trim models. According to this expansion, various LED products are released. In the case of high-power LEDs for the low and high beam of the head lamp, 5 LED chips are connected in series so that one LED module is used for the low beam function and the high beam function. -function The product is in the spotlight in the supply trim.

For a white LED, the typical forward voltage is 3.5V, which in series is 17.5V with five chips. However, depending on the LED operating temperature or the output current, the LED forward voltage is motorized to 14-18V. In the case of a vehicle (eg, a passenger car), since the input voltage is 9 to 16 V in a normal operation section, the light emitting module driver 120 driving the LED may be configured as a buck-boost topology.

However, buck-boost topologies are less efficient than buck and boost topologies, which can cause problems such as heat generation and input voltage drop. It may also cause problems such as drops of. As a result, a flicker phenomenon of the lamp during stop-start startup and component damage due to heat generation in a low voltage section may be caused.

Therefore, the light emitting module driver 130 of the present invention has a configuration including an input voltage unit Vin, a regulator 131, a first switch SW2, and a second switch SW3 as described above.

The first switch SW2 is linked to a low beam selection or a high beam selection input from the outside, and may change the converting mode of the light emitting module driver 130 to a boost converter mode or a buck boost converter mode.

The output terminal of the first light emitting module 110 is divided into at least two, and the converting mode of the light emitting module driver 130 is one of at least two output terminals of the first light emitting module 110 according to the switching of the first switch SW2. Allow current to flow through a specific output stage.

Here, the configuration for supplying the control signal to the light emitting module driver 130 is a separate control module connected to the vehicle lamp 100, and may be an ECU as an example of the control module.

The boost converter mode is that the light emitting module driver 130 is operated as a boost converter, and has a circuit configuration as shown in FIG. Here, the boost converter means a case in which the regulator 131 functions as a boost converter.

The boost converter raises the driving voltage by using the charge and discharge energy of the inductor as the switch is turned on or off. At this time, the diode prevents the current from flowing in the reverse direction due to the driving voltage higher than the input voltage.

Meanwhile, the buck boost converter mode is that the light emitting module driver 130 is operated as a buck boost converter, and has a recursive circuit configuration as shown in FIG. 7. Here, the buck boost converter means a case in which the regulator 131 functions as a buck boost converter.

In the buck boost converter mode, the voltage provided to the first light emitting module 110 is increased by using the inductor's charging and discharging energies through on / off of the switch, and the (-) terminal of the first light emitting module (cathode of the LED). ) Is connected to the input voltage, the voltage of the first light emitting module can be kept constant by the difference between the elevated voltage and the input voltage. Accordingly, in the buck boost converter mode, the voltage of the first light emitting module may be kept constant regardless of the input voltage.

There is also a buck converter mode. The buck converter is applied when the driving voltage is lower than the input voltage, and the ratio of the applied voltage to the vehicle is small compared to other modes, but the input voltage is 6V to 20V and the driving voltage is output at a constant voltage of 15V. In this case, it is applicable when converting an input voltage of 20V into a driving voltage that is a constant voltage of 15V.

In addition, the regulator 131 of the light emitting module driver 130 is provided as a boost converter, and as described above, the entire circuit configuration of the light emitting module driver 130 operates in the boost converter mode according to the operation of the first switch SW2. It is possible to operate in buck boost converter mode.

The light emitting module driver 130 may improve the efficiency of the DC / DC converter, reduce battery consumption of the vehicle, and prevent flicker due to voltage drops.

In order to increase the efficiency of the DC / DC converter, it is possible by reducing the power loss. Hereinafter, Equations 1 to 4 represent the electric loss of the MOSFET and the inductor. On the other hand, the power dissipation of the diode is proportional to the output current and is dependent on the load specifications, regardless of the DC / DC converter configuration.

Switching MOSFET Power Loss

<Equation 1>

<Equation 2>

Inductor Power Loss

<Equation 3>

<Equation 4>

Referring to Equations 1 and 2, the LED forward current and voltage are variables determined by the load specification, and the switch on time and the off time are determined by the MOSFET specification.

Also, among the variables of Equations 3 and 4, DCR and K-Factor are specifications of the inductor. Lowering the switching frequency will improve the efficiency, but it will increase the size and cost of the component by increasing the capacity of the inductor.

In conclusion, if the difference between the input voltage and the driving voltage is large, the power loss increases as the duty cycle increases. This means that under the same conditions, the boost converter is more efficient than the buck-boost converter.

In the following, Equations 5 and 6 represent respective duty cycles.

Duty Cycle of Boost Converter

<Equation 5>

Duty Cycle of Buck-Boost Converter

<Equation 6>

In addition, to compare the performance of buck boost and boost converters, it is fixed at a driving voltage of 15.5v, an output current of 1.45A, which is suitable for automotive bi-funtion headlamps, and the switching frequency is set to 250KHz, and then heats at a low voltage section of 8V. And the result of measuring the efficiency was derived as shown in FIG.

Temperature was measured with a thermal imaging camera at room temperature, and buck-boost is expected to exceed the component limit temperature of 175 ° C under 105 ° C, the vehicle's reliability test condition.

Boost, on the other hand, does not reach the component limit temperature without any heat dissipation measures.

Accordingly, the conversion of the conversion topology mode executed in the light emitting module driver 130 of the present invention may be changed from the boost converter mode to the buck boost converter mode, or mainly from the buck boost converter mode to the boost converter mode.

More specifically, the operation mode of the light emitting module driver 130 may be changed to the boost converter mode or the buck boost converter mode according to the vehicle input voltage, the driving voltages of the first light emitting module 110 and the second light emitting module 120. Can be.

As described above, the change of the converting topology mode executed in the light emitting module driver 130 is based on a control signal provided to the light emitting module driver 130.

The control module generates a control signal for driving a switch configuration that is responsible for mode switching in the light emitting module driver 130 so that the light emitting module driver 130 may operate in the boost converter mode in response to the low beam selection or the high beam selection. The generated control signal is provided to the light emitting module driver 130.

When the low beam is selected, the control module corresponds to a control signal for driving the switch configuration which is responsible for mode switching in the light emitting module driver 130 so that the light emitting module driver 130 may be operated in the buck boost converter mode. The generated control signal is provided to the light emitting module driver 130.

On the other hand, when the high beam is selected, the control module controls to operate the switch configuration that is responsible for mode switching in the light emitting module driver 130 so that the light emitting module driver 130 can be operated in the boost converter mode in response to the high beam being selected. A signal is generated and the generated control signal is provided to the light emitting module driver 130.

FIG. 2 is a circuit diagram illustrating the vehicle lamp of FIG. 1 as an example.

As shown in FIG. 2, the light emitting module driver 130 adjusts the driving voltage of the light emitting module 110 by charging or discharging the inductor L1 and the inductor L1 to which the input voltage of the vehicle is applied. The converter 131 and the converter mode which are disposed between the switch SW1 and the inductor and the first light emitting module 110 to block the reverse flow of the current output to the first light emitting module 110 and the converter mode. It may include a first switch (SW2) for changing the.

Here, the output terminal of the first light emitting module 110 is a cathode direction of the LED, it can be divided into two. Accordingly, in the converting mode of the light emitting module driver 120, current is supplied to one of the two output terminals A and B of the first light emitting module 110 according to the switching of the mode change switch. Output A corresponds to the current flow path in buck boost converter mode and output B corresponds to the current flow path in boost converter mode.

When the first switch SW2 is in the switched-on state, the light emitting module driver 130 operates in the boost converter mode to raise the input voltage to match the voltage driving voltage of the first light emitting module 110 to change the input voltage. Even if the voltage of the first light emitting module is adjusted to be the same as the driving voltage of the first light emitting module preset. At this time, the current flows in the B direction at the output of the first light emitting module 110.

At this time, the second switch SW3 is in a switched-off state, and constitutes a circuit for turning on both the first light emitting module 110 and the second light emitting module 120, but in the A direction of the first light emitting module 110. Shut off the flowing current.

In addition, when the mode change switch SW2 is in the switched off state, the light emitting module driver 120 operates in the buck boost converter mode so that the boosted voltage applied to the positive terminal (the anode of the LED) of the first light emitting module is increased. The voltage of the first light emitting module 110 matches the driving voltage of the first light emitting module preset by the difference between the voltage and the input voltage connected to the negative terminal (the cathode of the LED) of the first light emitting module. Adjust At this time, the current flows in the A direction at the output of the first light emitting module 110.

In this case, the second switch SW3 is in a switched-on state, and configures a circuit to turn on the first light emitting module 110 and to turn off the second light emitting module 120. The current flows in the A direction.

That is, the control signal provided to the light emitting module driver 130 may be a signal for turning on or off the first switch SW2. The control signal provided to the light emitting module driver 130 also turns on or off the voltage adjusting switch SW1 to adjust the voltage supplied to the first light emitting module 110 and the second light emitting module 120 serving as loads. It is also possible.

Furthermore, the light emitting module driver 130 may further include a second diode that blocks a current flowing from the input voltage to the output unit A direction of the light emitting module dry 130.

When operating in the boost converter mode, when there is no second diode, the light emitting module output unit (A direction) is shorted at the input voltage so that the current does not go through the regulator 131 at the input voltage and the first light emitting module 110 is not present. ) And does not boost the input voltage by the regulator 131.

Therefore, to prevent this short current in boost mode, a second diode is included.

The first light emitting module 110 may include an LED, and the light emitting module driver 130 may include an input connected to an anode of the LED and an output connected to a cathode of the LED.

FIG. 3 is a circuit diagram illustrating a current flow in a first stage when the first switch of the light emitting module driver of FIG. 2 is turned on.

3 is a circuit diagram illustrating a current flow in a first stage when the first switch SW2 of the light emitting module driver 130 of FIG. 2 is switched to an on state, and FIG. 4 is a view of the light emitting module driver 130 of FIG. 2. When the mode change switch SW2 is switched to the on state, it is a circuit diagram showing the current flow in the second stage, and FIG. 5 is a case where the mode change switch SW2 of the light emitting module driver 130 of FIG. FIG. 9 is a circuit diagram showing the current flow in the third stage, and FIG. 9 is a graph showing the result of each stage shown in FIGS.

The mode change switch SW2 mentioned above may be provided as a metal-oxide-semiconductor field effect transistor (MOSFET).

When such a MOSFET is turned on, it may proceed in three steps as shown in FIGS.

Step 1 of FIG. 3 is a state just before the MOSFET is turned on, and since the gate voltage of the MOSFET is low, the drain and the source are opened to operate the LED module 130 in the regressive buck-boost converter mode. Be sure to

At this time, the voltage regulating switch SW1 boosts the load forward voltage, the second diode, and the input voltage to a voltage in order to maintain a constant current.

In step 2 of FIG. 4, when the MOSFET is turned on and in the active region, the current acts as a resistor so that current flows in both directions, and the sum of the currents is equal to the current flowing in the first light emitting module 110. The voltage maintains the same voltage as in the first step described above because current flows in the second diode direction.

In step 3 of FIG. 5, when the MOSFET is completely conducted, current flows only in the direction of the MOSFET.

Referring to FIG. 10, the current voltage waveforms of the circuit operation process of FIGS. 3 to 5 that convert from buck boost to boost mode may be checked.

b is a current flowing through the second diode, a is a current flowing through the first switch SW2, and c is a sum of a and b. d and e represent the anode and cathode voltages of the load of the first light emitting module 110. As shown in FIG. 9, when the mode is changed, the current applied to the load is kept constant so that the topology is changed without the flicker phenomenon.

FIG. 11 is a circuit diagram illustrating a current flow in a first stage when the first switch SW2 of the light emitting module driver 130 of FIG. 2 is turned off, and FIG. 12 is a view of the light emitting module driver 130 of FIG. 2. When the first switch SW2 is turned off, a circuit diagram showing a current flow in a second stage, and FIG. 13 is a case where the first switch SW2 of the light emitting module driver 130 of FIG. 2 is turned off. A circuit diagram showing the current flow in the third stage.

When the mode is changed from boost to buck boost, each step as shown in FIGS. 11 to 13 is sequentially performed. This is the same as the reverse of each step shown in FIGS. 3 to 5.

In addition, as shown in FIG. 4 or FIG. 12, the MOSFET is temporarily operated like a resistor before it is fully conducted, so that the current supplied to the first light emitting module 110 at a moment of changing the converting topology mode is constant. By holding it, the flicker phenomenon of the first light emitting module 110 can be prevented.

6 is a circuit diagram illustrating another example of the vehicle lamp of FIG. 1.

As illustrated in FIG. 6, the second switch SW3 may be connected to an output terminal of the second light emitting module 120.

14 is a circuit diagram illustrating another example of the vehicle lamp of FIG. 1.

As illustrated in FIG. 14, the first switch SW2 may include an RC circuit having a resistor and an accumulator, and a transistor having a RC circuit connected to a base and a first light emitting module 110 connected to a collector.

When the transistor of the first switch SW2 is in an energized state and is converted from the buck boost converter mode to the boost converter mode, an overcurrent flow can be prevented by applying a current to the RC circuit.

That is, the operation of the light emitting module driver 130 in the boost converter mode means that the gap between the input voltage and the driving voltage is large. Even though the mode switching is performed slowly through the RC circuit included in the operation circuit of FIG. 14, the overcurrent Should be prevented.

In addition, when the transistor of the first switch SW2 is in a state where the power supply is cut off, and is switched from the boost converter mode to the buck boost converter mode, the transistor can be quickly switched mode within a predetermined time.

That is, the operation of the light emitting module driver 130 in the buck boost converter mode means that the gap between the input voltage and the driving voltage is relatively smaller than that in the boost converter mode described above. You can quickly switch modes.

FIG. 15 is a circuit diagram illustrating another example of the vehicle lamp of FIG. 1.

As shown in FIG. 15, the vehicle lamp may be extended not to the concept of a single lamp but to a concept including both headlamps of the vehicle. That is, not only the configuration of controlling the low beam and the high beam of the vehicle lamp with the light emitting module driver 130, but also the configuration of controlling both headlamps with the light emitting module driver 130.

To this end, a vehicle lamp having a concept including both headlamps includes a third light emitting module 140 connected in parallel to the first light emitting module 110, and a fourth light emitting light connected in parallel to the second light emitting module 120. The module 150 may further include.

In other words, the first light emitting module 110 and the third light emitting module 140 corresponding to the low beam become the first group, and the second light emitting module 120 and the fourth light emitting module 150 corresponding to the high beam ) May be the second group. In this structure, the light emitting module driver 130 may execute driving for light output for each group.

FIG. 16 is a circuit diagram illustrating another example of the vehicle lamp of FIG. 1.

As shown in FIG. 16, the light emitting module driver 130 may have a different circuit configuration according to a high beam or a low beam.

For example, when the high beam is selected, the light emitting module driver 130 lowers the current flowing to the second light emitting module 120 to be lower than or equal to a predetermined reference current in preparation for the current flowing to the first light emitting module 110. The leakage current block 160 may be further included in parallel with the second light emitting module 120.

That is, when the input current passes through the first light emitting module 110, 100% is applied so that the first light emitting module 110 outputs light, and the leakage current block 160 connected in parallel to the second light emitting module 120. 20% of the current flows through the current flow control configuration (for example, resistance) so that 80% of the current flows through the second light emitting module 120 and 20% of the current flows through the leakage current block 160. .

As a result, the amount of current of the second light emitting module 120 may be adjusted differently from that of the first light emitting module 110, thereby controlling the amount of heat generated by the second light emitting module 120 corresponding to the high beam.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. You will understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

In addition, the present invention is to provide a vehicle lamp circuit topology for efficiently improving the configuration of a light emitting module driver that outputs a large amount of low beam or high beam, the possibility of commercialization or sales is not only sufficient but also realistically implemented. It is an invention with industrial applicability as much as it can be.

100: vehicle lamp 110: first light emitting module
120: second light emitting module 130: light emitting module driver
140: third light emitting module 150: fourth light emitting module
160: leakage current block

Claims (20)

A first light emitting module;
A second light emitting module; And
A light emitting module driver for supplying a driving voltage to at least one of the first light emitting module and the second light emitting module;
The light emitting module driver,
An input voltage unit receiving a voltage supplied from a vehicle;
A regulator for adjusting a voltage provided from the input voltage unit;
A first switch; And
A second switch;
One end of the first switch is connected to the first light emitting module, and the other end of the first switch is disposed to be connected to the second light emitting module,
The second switch is arranged such that one end is connected to the input voltage unit,
When the lamp of the vehicle is selected to irradiate a low beam, the first switch is turned off, the second switch is turned on, and the light emitting module driver is set to a buck boost converting mode.
And the first switch is turned on when the lamp of the vehicle is selected to irradiate a high beam, and the second switch is turned off to set the light emitting module driver to a boost converting mode. According to claim 1,
The first light emitting module is connected to an output terminal of the regulator, and the second light emitting module is connected to an output terminal of the first light emitting module, the first switch, or a switch block including the first switch and the second switch. Automotive lamp circuit topology to be connected. delete delete According to claim 1,
A third light emitting module connected in parallel to the first light emitting module; And
And a fourth light emitting module connected to the second light emitting module in parallel. delete delete delete delete According to claim 1,
The converting mode of the light emitting module driver is a vehicle lamp circuit topology for applying a current to any one of the two output terminals of the first light emitting module according to the switching of the first switch. According to claim 1,
When the light emitting module driver is in the boost converting mode, the light emitting module driver is connected to the second light emitting module in parallel so as to lower the current flowing to the second light emitting module below a predetermined reference current in preparation for the current flowing to the first light emitting module. Further comprising a leakage current block,
The other end of the second switch is a vehicle lamp circuit topology connected to the leakage current block. delete delete delete delete delete delete delete delete delete

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