KR100446102B1 - the appartus and method for synchronous lighting by one ballast with two bulb - Google Patents

Abstract

PURPOSE: An apparatus and a control method thereof are provided to efficiently control imbalance loads and turns on two bulbs or left and right lamps at the same time. CONSTITUTION: An apparatus comprises a full bridge inverter including a first inverter(20) and a second inverter(30); a controller(40); a step-down chopper(15); and an ignitor(70). The first inverter detects voltage and current output during operation of left lamp through sensing resistors(R5,R7,R8) and a sensing resistor(R11) coupled to a fly back converter(10). The second inverter detects voltage and current output during operation of right lamp through sensing resistors(R12,R14,R15) and a sensing resistor(R16). The controller takes, as an input, voltages from a power source(11) and current through a resistor(R10), stabilizes power applied to each load by maintaining output power at a constant level, and controls imbalance loads by detecting voltage and current output during operation of first and second inverters. The step-down chopper is connected to the controller, and maintains power of two bulbs constant by permitting power of the large resistance side bulb to be coincided to a reference power and controlling voltage of the smaller resistance side bulb. The ignitor is connected to the first and second inverters, and simultaneously applies high voltage pulses to left and right lamps such that the lamps are turned on.

Description

The appartus and method for synchronous lighting by one ballast with two bulb}

The present invention relates to an apparatus and a control method for simultaneously lighting two discharge tubes (BULB) with one ballast, and more specifically, two inverters and one inverter for controlling two discharge tubes (BULB) or left and right lamps with one ballast. Its purpose is to simultaneously control two unbalanced loads on both ends and simultaneously turn on two discharge tubes (BULB) or left and right lamps by constructing an igniter in which two layers of foil are stacked in a stacked form of a step down chipper and a capacitor.

In general, ballasts (ballasts) have the function of supplying the high starting voltage required for starting the lamp and limiting the lamp current after the lighting to the specified value. For this reason, ballasts require adequate ignition pulses for lighting, adequate open circuit voltage and instantaneous current for transitioning from discharge to ignition after discharge, and proper lighting control for rapid lighting during initial lighting. In addition, the power supplied for long life and stable light output in steady state should be constant. However, the tube voltage of the lamp varies greatly depending on individual products and tends to increase as the lamp operating time elapses, which causes difficulties in lamp power control and controller design.

Especially for vehicles that are subject to unbalanced control Independent control was performed with two existing ballasts to drive HID (High Intensity Dischare) lamps. However, there are two igniters to secure space in the vehicle and to generate high voltage for mounting two ballasts, resulting in increased equipment cost and safety problems.

Also for existing vehicles In order to drive the HID (High Intensity Dischare) lamp, the conditions of the left and right lamps (LAMP) attached to the front of the vehicle are different and the uniformity of the tube voltage inside the discharge tube (BULB) does not exactly match, so one ballast is used for one lamp (LAMP). A ballast was required and control was performed separately. In this case, the upper and lower lamps (LAMP) are configured at the same time in the configuration of the lamp (LAMP) of the vehicle, the upper lamp is a conventional halogen lamp and the lower lamp is composed of HID (High Intensity Dischare) lamp.

Accordingly, the present invention has been made to solve the above problems, the apparatus for simultaneously lighting two independent discharge tubes (BULB) or lamps with one ballast in the HID (High Intensity Dischare) system used for automobile headlamps And a control method, in particular, an igniter in which two foils are stacked in a stacked form of two inverters, a step down chopper, and a capacitor to control unbalanced loads at both ends to control two discharge tubes (BULB). The purpose is to light up the left and right lamps at the same time.

1 is a circuit diagram for simultaneously lighting two discharge tubes (BULB) in one ballast according to the present invention.

2 is an operational waveform diagram for simultaneously lighting two discharge tubes BULB according to the present invention with one ballast.

3 is an embodiment showing the operation of the flyback converter in the voltage control of the present invention

Figure 4 is an embodiment showing the operation of the flyback converter in the current control of the present invention

Figure 5 is an embodiment showing the 'ㅑ' type winding shape of the igniter portion according to the present invention

Figure 6 is an embodiment showing a double overlap-type winding shape of the igniter portion according to the present invention,

7 is an embodiment showing a serial winding shape of the igniter unit according to the present invention,

8 is a block diagram showing a method of simultaneously lighting two discharge tubes BULB with one ballast according to the present invention.

9 is a block diagram showing in detail the simultaneous lighting relationship of the simultaneous lighting method according to the present invention.

* Explanation of symbols for the main parts of the drawings *

10: Flyback Converter 11: Power Supply

12: input voltage detector 13: input current detector 15: step down chopper (PEP DOWN CHOPPER) 16: PWM controller 20: first inverter 21, 31: output current detector

22, 32: output voltage detector 23, 33: gate driver 30: second inverter 40: controller 50: LEFT lamp 60: RIGHT lamp

70: Igniter

The apparatus of the present invention for achieving the above object is a flyback converter (Flyback converter) and a full bridge inverter (Full Bridge inverter) and a power supply unit, a PWM control unit and a gate driving unit consisting of two ballasts (BULB) Configured to light at the same time,

The full bridge inverter detects an output voltage and an output current output when the left (LEFT) lamp is operated through the sensing resistors R5 and R7 and the sensing resistor R11 coupled to one side of a flyback converter 10. A second inverter 30 that detects and senses an output voltage and an output current which are output during the operation of the right lamp through the first inverter 20, and the sensing resistors R12 and R14 and the sensing resistor R16. Divided into)

The input voltage is input from the power supply unit 11, the input current is input through the resistor R10, respectively, and the output power is maintained at a predetermined level to stabilize the power supplied to each load and output when the first and second inverters are operated. A controller 40 for controlling an unbalanced load between both ends by detecting an output voltage and an output current,

Connected to one side of the controller 40, in order to control the unbalanced load generated during the initial driving of the lamp, first adjust the power of the higher resistance to the reference power, and then control the tube voltage of the discharge tube BULB having the small resistance to control both discharge tubes ( Step down chopper (STEP DOWN CHOPPER) 15 which makes electric power of BULB) constant,

An igniter unit connected to one side of the first and second inverters to simultaneously apply a high voltage pulse to the left and right lamps so that the lamp can be ignited with high voltage at the time of initial or re-ignition of the lamp. It characterized in that it comprises a 70.

In addition, the present invention is a method of simultaneously lighting two discharge tubes (BULB) with one ballast,

The controller measures the value of output voltage and input voltage so that the igniter can operate in the section where power is supplied to the ballast and the lighting is not started, and the duty of the flyback converter stage is maximized until the lighting is started. A voltage control step (S110) of controlling the high voltage to be applied to the transformer secondary side;

Simultaneously lighting two independent lamps or lamps having two discharge tubes BULB in one body through control of a controller in the gate driver (S120);

A current control step S130 for allowing a large amount of current to flow through free movement of charge between the start-up and transition periods of the discharge tube BULB of the ballast BALLAST to stabilize the direct current (DC) drive;

The power control step (S140) of controlling both voltage and current so that the discharge tube BULB can be normally turned on by measuring the input voltage and the current and the output voltage and the current while the ballast BALLAST goes to the stabilized state after the transition period. Characterized in that consists of.

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

FIG. 1 is a circuit diagram of simultaneously lighting two discharge tubes BULB according to the present invention with a single ballast, which is a flyback converter 10 and a full bridge inverter 20 and 30. , A controller 40, a PWM controller 16, a step down chopper 15, gate drivers 23, 33, and an igniter 70.

Particularly, the full bridge inverter has a first inverter 20 and a right side for driving the left lamp 50 so as to simultaneously light the left lamp 50 and the right lamp 60 of the vehicle. (RIGHT) is composed of a second inverter 30 for driving the lamp 60.

Here, since the configuration and operation of the PWM control unit and the gate driver is a common technique in the art, a detailed description thereof will be omitted.

The flyback converter 10 is connected to an input voltage detector 12 that detects an input voltage input from a battery and a generator, which is a vehicle power source, according to a constant ratio of the resistor R3 and the resistor R4 to one side. On the side of the input voltage detector 12, an input current detector 13 for detecting an input current input to the switching transistors S3 and S4 turned on / off by a control signal of the PWM controller 16 at initial startup. ) Is connected, and when the switching transistors S3 and S4 are turned on / off at the upper end of the circuit, a transformer T1 that boosts and outputs the voltages V + and V- of the battery and the generator is connected to the transformer T1. Diodes (D1, D2) rectifying the high voltage (1500V) output from the) to the igniter 70, and the first inverter by rectifying the DC voltage output from the transformer (T1) that is variable according to the ignition state of the lamp Provided to the 20 and the second inverter (30) The odd (D3, D4) is connected. In addition, an electrolytic capacitor C5, resistors R6 and R11, and an electrolytic capacitor C6 are connected in parallel between the cathode terminal and the ground terminal of the diode D3, and between the cathode terminal and the ground terminal of the diode D4. Similarly, the electrolytic capacitor C8, the resistors R13 and R16 and the electrolytic capacitor C9 are connected in parallel with each other.

Here, the input voltage detector 12 detects whether or not the load is constantly supplied at 12V, and the input current detector 13 uses the current command value provided from the controller through the sensing resistor R10 at initial startup. It detects whether a constant current flows in the transformer T1.

The first inverter 20 couples a sensing resistor to one side of a flyback converter 10 so that either one of two independent lamps or a lamp having two discharge tubes BULB is connected to a left lamp lamp (LEFT). 50 has a sensing function for controlling to operate, which is composed of sensing resistors R5, R7, and R8, an electrolytic capacitor C7, and a sensing resistor R11, as shown in FIG. Located between R7) and the sensing resistor (R8) is connected to the output voltage detection unit 22 for detecting the voltage output when the left (LEFT) lamp is operating, through the igniter unit during the initial driving of the lamp through the sensing resistor (R11) Output current detectors 21 for detecting an incoming DC current are connected, respectively, and switching transistors S1, S2, S5, and S6 switched by driving signals output from the gate driver 23 are connected.

In addition, the second inverter 30 combines a sensing resistor to one side of the flyback converter 10 to right one of two independent lamps or a lamp having two discharge tubes BUBL. It has a sensing function to control the operation to the lamp 60, which is composed of a sensing resistor (R12, R14, R15), an electrolytic capacitor (C10) and a sensing resistor (R16), as shown in FIG. An output voltage detector 32 is disposed between the sensing resistor R14 and the sensing resistor R15 to detect a voltage output when the RIGHT lamp is operated. The igniter is activated when the lamp is initially driven through the sensing resistor R16. Output current detectors 31 for detecting a DC current flowing through the unit are connected, respectively, and switching transistors S7, S8, S9, and S10 switched by a drive signal output from the gate driver 33 are connected.

The controller 40 has the characteristics of a PWM generator, lamp power stabilization, lamp temperature compensator, and total fault protection circuit. The controller 40 receives an input voltage from a power supply and maintains the input current at a predetermined stage through an initial resistor R10. By controlling the voltage supplied to each load and detecting the output voltage and the output current generated when the first inverter 20 and the second inverter 30 is operated to control the unbalanced load between both ends.

Thus, the controller 40 is connected to the input voltage detector 12 used to constantly control the initial voltage to 12V as shown in FIG. 3, and the current provided from the controller is provided on the side of the input voltage detector 12. Used to obtain a constant voltage using the command value

It is connected to the input current detector 13, the output current detector 21 used to control the DC current which is variable in the igniter unit according to the ignition state of the lamp is connected, the left (LEFT) lamp and the right (RIGHT) lamp Output voltage detectors 22 and 32 for detecting an output voltage output during operation are connected, and a DC voltage of a level varying according to a predetermined level of DC voltage from the flyback converter 10 and an ignition state of the lamp. The PWM control unit 16 for outputting the respective signals is connected, and the gate driver 22 for providing a gating signal as a control signal is output so that the square wave AC voltage is output from the first inverter and the second inverter.

The step down chopper 15 is connected to one side of the controller 40 as a BUCK converter, so that the power having the higher resistance is first applied to the reference power to control an unbalanced load generated during initial driving of the lamp. After the matching, the tube voltage of the discharge tube BULB having a small resistance is controlled to make the power of both discharge tubes BULB constant.

The igniter portion has a primary side on one side in a stacked form of a capacitor, and a secondary side on a side of the primary side. Here, in the present invention, the secondary side is configured as two, characterized in that configured to be connected to any one of the left (LEFT) lamp 50 and the right (RIGHT) lamp (60).

In particular, in the winding method of the igniter portion having one primary winding and two secondary windings, as shown in FIG. 5, a primary side is formed on one side and two secondary sides are formed on the side of the primary side in the longitudinal direction, respectively. It is arranged in a 'ㅑ' form, or as shown in Figure 6 to form a primary side on one side of the secondary side to form any one of the two secondary side and the other side to form the double It is formed by laminating, or as shown in Figure 7 to form a primary side on one side and two secondary sides are arranged side by side on the side of the primary side to form a serial form.

One of the two secondary sides thus formed is connected to the left (LEFT) lamp 50 and the right (RIGHT) lamp 60 to form two ballasts with one ballast to discharge two discharge tubes (BULB) or left and right lamps. You can control it.

In addition, the winding material is preferably made of aluminum foil having excellent thermal and electrical conductivity and strong corrosion resistance in the atmosphere.

As such, the apparatus for controlling the simultaneous lighting of two discharge tubes BULB with one ballast according to the present invention includes a conventional flyback converter 10, a full bridge inverter 20, 30, In the apparatus for simultaneously lighting two discharge tubes (BULB) with two ballasts consisting of a power supply (11), a PWM control section (16), and a gate driver (23, 33), the flyback converter (10) An input voltage detector 12, an input current detector 13, a step down chopper 15, and an output current detector 21, 31 are configured to constitute the flyback converter 20. A first inverter 20 having a sensing function for driving the left (LEFT) lamp 50 and a second inverter 30 having a sensing function for driving the right (RIGHT) lamp 60, , LAMP lamp 50 and RIGHT lamp That comprises the igniter 70 such that the foil-type connection formed at the same time to 60 characterized.

Hereinafter, an operation for simultaneously lighting two discharge tubes BULB according to the present invention with one ballast will be described.

As shown in FIG. 2, a breakdown section in which discharge starts, a glow discharge section due to ion collision, a glow to arc transition section from a glow discharge state, and a hot electron emission It can be largely classified into an arc discharge section.

First, as shown in FIG. 2, there is a high-voltage pulse for ignition with a voltage that breaks the internal insulation state by applying to both ends of the lamp as a breakdown section at which discharge starts, which is 2 KV at the initial start (cold start). For a hot start, 25 KV is required. In the case of re-ignition, it is necessary to cool the lamp to avoid the high ignition voltage, but in order to recover to the cold state during natural cooling, it takes 10 minutes or more. In the present invention, an ignitor 70 capable of outputting more than 25K is applied. .

Next, there is a voltage that maintains a glow discharge state after ignition of the lamp by a glow discharge section due to ion collision. In the present invention, a voltage of about 600 V is applied to the lamp before ignition before ignition. ) To keep the glow state.

Next, the take-over current circuit is a section in which the lamp transitions from the glow discharge state to the arc discharge state after ignition. If the take-over current is not supplied sufficiently, the lighting fails because the voltage of the lamp immediately after the arc discharge transition is lowered, and the lamp maintains the arc discharge with the current supplied from the ballast. Therefore, in the present invention, the take-over current circuit is configured to flow current to the lamp until the current is sufficiently supplied from the ballast.

Next, there is an arc discharge section by hot electron emission, which transitions from the glow discharge state to the arc discharge state, and then the internal temperature and pressure of the lamp are increased by the power supplied from the ballast. At this time, the voltage and light output of the lamp also increase to reach a steady state. Since the current supplied in this operation section not only determines the warm-up time of the lamp, but also the light output response characteristic in the transient state, the present invention controls the lamp power to the desired power through the control of the controller.

Finally, the power supplied to the lamp is controlled at a constant value to obtain a constant light output in a steady state, thereby preventing the light from shaking and reducing the lifespan.

As described above, the controller 40, the step down chopper 15, and the first inverter, which are the apparatus of the present invention, are based on the operation items for simultaneously lighting two discharge tubes BULB according to the present invention with one ballast. 20, detailed operations of the second inverter 30 and the igniter unit 70 will be described.

First, the operation of the controller 40 will be described with reference to FIG. 1, which is characterized by a PWM generator, lamp power stabilization, lamp temperature compensator, and overall fault protection circuit. The input voltage and the input current are input from the battery and the generator, respectively. In order to control the power supplied to each load by maintaining the output power in a predetermined step, and to control the output voltage and the output current provided to the first inverter 20 and the second inverter 30, in particular the output voltage detector 22, 32) between the sensing resistor R7 and the sensing resistor R8 and between the sensing resistor R14 and the sensing resistor R15 when the left lamp 50 and the right lamp 60 are operated. When the generated output voltage is detected and the magnitude of either unbalanced load increases, the unbalanced load is controlled by increasing the system short-circuit capacity to keep the output voltage constant.

When the step down chopper (15) is operated, the input voltage and the current of a predetermined step input to the step down chopper (STEP DOWN CHOPPER) 15 are controlled by the control signal of the PWM controller 16. The unbalanced load generated between both discharge tubes BULB is controlled during initial operation of the lamp.

In addition, the gate driver 23 of the first inverter 20 and the gate driver 33 of the second inverter 30 are controlled to simultaneously light up the left (LEFT) lamp 50 and the right (RIGHT) lamp 60. To control.

Next, when the operation of the first inverter 20 is described, it operates while the pair of switches alternately conduct and cut off using four switches S1, S2, S5, and S6. In other words, if you look at the operating waveform of the switch, the voltage stress of the switch is the same as the input voltage, but if you look at the waveform of the voltage of the primary side of the transformer, the maximum value is double the half bridge, which is double the output. It means that can be obtained twice. In other words, since the voltage and current are inversely related, the input current becomes the switch current. Therefore, the output current of the inverter is half of the switch current in the half bridge under the same output condition.

The current in the circuit of the first inverter 20 is expressed by Equation 7 as follows.

The order of switching in the circuit is composed of (S1, S6) and (S2, S5) to operate as a square wave.

In this operation, the first inverter 20 receives a DC voltage of 20 to 100 V output from the flyback converter 10 and converts it into a square wave AC voltage of 150 to 200 Hz, and combines a sensing resistor on one side to provide two independent voltages. It has a sensing function that controls one of the lamps or the lamp having two discharge tubes (BULB) in one body to be operated as the left (LEFT) lamp 50, which is the sensing resistor (R5, R7, R8) when driving the lamp. ) And the output resistor 50V at a constant ratio from the sensing resistor R11 to the left lamp 50 through the gate driver 23, or as the resistance of the lamp increases, the sensing resistor R11 in the igniter unit. Control the unbalanced load between both lamps by reducing the amount of current flowing into).

At this time, the voltage output between the sensing resistor R7 and the sensing resistor R8 is detected by the output voltage detector 22 and the switching transistors S1, S2, S5 switched by the drive signal output from the gate driver 23. S6) turns on the left lamp.

Next, the operation of the second inverter 30, which is similar to the first inverter 10, receives a DC voltage of 20 ~ 100V output from the flyback converter 10, the square wave of 150 ~ 200Hz Sensing function that converts AC voltage and combines a sensing resistor on one side to control one of two independent lamps or one lamp having two discharge tubes (BULB) on one body to operate as RIGHT lamp 60 Has That is, when the lamp is driven, the sensing voltage (R12, R14, R15) and the sensing resistor (R16) sense the output voltage 50V at a constant ratio and apply it to the RIGHT lamp through the gate driver 33, or the resistance of the lamp is As it increases, the current flowing into the sensing resistor R16 from the igniter portion is reduced to reduce the amount of sensing, thereby controlling the unbalanced load between both lamps.

At this time, the voltage output between the sensing resistor R14 and the sensing resistor R15 is detected by the output voltage detector 32 and the switching transistors S7, S8, and S9 switched by the driving signal output from the gate driver 33. , S10) turns on the right (RIGTHT) lamp 60.

Next, the operation of the igniter unit 70 and the step down chopper (STEP DOWN CHOPPER) 15 will be described.

When the voltage applied from the power supply reaches a constant voltage of 400V ~ 600V, it is supplied to the igniter through the electronic spark gap (SPARK GAP), which is automatically delivered, and the igniter generates the discharge necessary for the initial glow discharge of the discharge tube BULB. Initiate. At this time, the inverter keeps the pass of current PASS in one direction for continuous supply of power. At this time, the two secondary side according to the present invention is connected to each discharge tube (BULB) to supply the voltage required for discharge.

However, at this time, the smoothed voltage before the inverter is constant, so that the electric power applied to the discharge tube BULB during the initial operation has a small resistance component and a large current flows, and a large current causes a power unbalance.

In the present invention, in order to improve the power unbalance, through the step down chopper which can reach the rating by controlling the tube voltage of the discharge tube (BULB) with a low resistance after matching the power of the larger resistance to the reference power The electric power of both discharge tubes BULB is made constant.

That is, when the power unbalance between the two discharge tubes (BULB) occurs during the initial driving of the lamp, the controller sends a control signal through the PWM control unit 16, the control signal of the PWM control unit to the step down chopper (STEP DOWN CHOPPER) 15 By adjusting the input voltage and input current at a certain stage, the unbalanced load generated between the discharge tubes BULB can be controlled by adjusting the power of the resistor with the higher resistance to the reference power and then controlling the tube voltage of the discharge tube with the lower resistance. There is.

Hereinafter, a method of controlling the two discharge tubes BULB by simultaneously lighting one ballast according to the present invention will be described.

First, the controller measures the value of output voltage and input voltage so that the igniter can operate in the section where power is applied to the ballast and the lighting is not started, and the duty ratio of the converter stage is maximized until the lighting is started. As a voltage control step (S110) to control the high voltage is applied to the transformer secondary side.

As an example, as shown in FIG. 3, a battery power supply of 12V, which is a vehicle power supply, is boosted in a flyback converter and smoothed. At this time, when the transistors S3 and S4 are turned off by the control signal of the PWM controller output from the controller 40, the input current flowing to the primary side of the transformer no longer flows, and no magnetic flux occurs in the core. Looking at the secondary side of the transformer, the polarity of the electromotive force E _S is reversed, biasing the output diode D forward. At this time, the energized energy on the secondary side of the transformer core induces a voltage on the primary side upside down according to the primary and secondary winding ratios. The reflected voltage V _fb is called a flyback voltage and is expressed by Equation 8 below. I can express it.

Here, Vfb is applied between the drain and the source when the transistors S3 and S4 are turned off to select the breakdown voltage, and the duty ratio is maximized so that the high voltage is applied to the secondary side of the transformer. The voltage is controlled to be applied.

Next, there is a step (S120) of simultaneously lighting two independent lamps or lamps having two discharge tubes BULB in one body through the control of a controller in the gate drivers 23 and 33.

As described above, an unbalanced load between both ends is formed by constituting an igniter in which two foils are stacked in a stacked form of two inverters, a step down chopper for controlling an unbalanced load between both discharge tubes BULB, and a capacitor. It is possible to control the two discharge tubes (BULB) or the left and right independent lamps at the same time with one ballast.

As an example, as shown in FIG. 9, first, the power chattering applied to the power supply unit is checked (S200), and whether the condition of the discharge tube BULB is re-lit or initial-lit is checked (S210). If the condition of the discharge tube BULB is re-lit, the full bridge converter duty ratio 2 is determined (S220), which is expressed by the following equation (9).

Where D ₂ is the full bridge converter duty ratio on re-lighting.

If the condition of the discharge tube BULB is initially turned on, the full bridge converter duty ratio 1 is determined (S230), which is expressed by Equation 10.

Where D1 is the full bridge converter duty ratio at initial lighting.

The duty ratio (1) and the duty ratio (2) determined as described above are added to determine the optimum duty ratio to apply a DC voltage (400V ~ 600V) suitable for driving the first inverter and the second inverter (S240).

The generated DC voltage is automatically supplied to the igniter unit through the electronic spark gap (SPARK GAP), and the voltage supplied to the igniter unit generates a voltage necessary for initial glow discharge to start discharging (S250). Then, the discharge tube BULB turns on simultaneously (S260).

At this time, if an unbalanced load is generated between both discharge tubes, the power of the left and right lamps is compared (S270).

In other words, if the power of either of the left and right lamps is large, the step down chopper is driven by the control of the controller to match the power of the higher resistance to the reference power first, and then the tube voltage of the discharge tube BUBL having the small resistance. By controlling the power of the both discharge tube (BULB) to be constantly controlled (S290). The first inverter detects and senses an output voltage and an output current output during the operation of the left lamp through the sensing resistors R5, R7, and R8 and the sensing resistor R11, and senses the sensing resistors R12 and R12 in the second inverter. The output voltage and the output current output during the operation of the right lamp through R14 and R15 and the sensing resistor R16 are sensed and sensed to perform alternating control between the first inverter and the second inverter (S300).

If the power of either of the left and right lamps is small, the inverters are alternately controlled as described above (S280) and the lighting is maintained at a constant constant power (S310).

Next, a current control step (S130) for allowing a large amount of current to flow through free movement of charge between the start-up and transition periods of the discharge tube BULB of the ballast BALLAST to stabilize the direct current (DC) drive. have.

For example, as shown in FIG. 4, when the transistors S3 and S4 are turned on, the primary side of the transformer having the inductance L _p receives the input voltage V _in . In this case, it is assumed that the input voltage is an ideal DC, and the time t while the transistors S3 and S4 are turned on is assumed to be a ratio D (duty cycle) of the switching period T. At that time, the input current increases by (11).

At this time, as the input current i _in (t) increases, the magnetic energy of the transformer also increases. And when the input current i _in (t) is variable and flows through the primary winding of the transformer, the magnetic flux Φ (t) is generated inside the core of the transformer, and the electromotive force is represented on both ends of each winding according to Faraday's law as shown in Equation 12. do.

That is, when the electromotive force Ep is induced on the primary side, the secondary side is induced with the opposite polarity Es, and the output diode D is reverse biased. Therefore, the energy of the input voltage is accumulated only in the core and does not go to the secondary side, only the energy of the output capacitor is supplied to the load.

In this way, when the input current increases and ends, t = DT, the input current is maximized to stabilize the direct current (DC) drive.

Next, the power control step of controlling both the voltage and the current to measure the input voltage and current, and the output voltage and current while the ballast BALLAST goes to the stabilization state after the transition period, so that the discharge tube BULB can be normally turned on. There is (S140).

In one embodiment, when power is supplied to the first inverter 20 and the left lamp 50 is normally turned on, the first inverter 20 senses the sensing resistors R5, R7, and R8 and the sensing resistors ( R11) detects and detects an output current and an output voltage generated at a high voltage of an igniter that varies according to the ignition state of the left (LEFT) lamp 50.

At this time, the controller 40 compares the preset current set value with the output current of the transformer T1 to maintain a normal lighting state when the left lamp is operated through the step down chopper 15. If out of the range, the output current of the transformer T1 can be kept constant by controlling the frequency and pulse width of the PWM control signal.

In the same manner, when power is supplied to the second inverter 30, the second inverter 30 uses the sensing resistors R12, R14, and R15 and the sensing resistor R16 according to the ignition state of the RIGHT lamp. Detects and detects the output current and the output voltage generated at the high voltage of the igniter.

At this time, the controller 40 adjusts the preset current set value and the output current of the transformer T1 to maintain normal lighting when the RIGTH lamp 60 operates through the step down chopper 15. In comparison, when the deviation is more than a predetermined range, the output current of the transformer T1 can be kept constant by controlling the frequency and pulse width of the PWM control signal.

As described above, in the present invention, an igniter in which two foils are stacked in a stacked form of two inverters, a step down chopper, and a capacitor is configured to efficiently control an unbalanced load between both ends, thereby providing two discharge tubes (BULB). ) And left and right lamps can be lit simultaneously with one ballast.

As described above, the present invention provides a device for controlling two discharge tubes (BULB) simultaneously with one ballast, which is performed by independently controlling two conventional ballasts to drive a vehicle HID lamp that is an unbalanced control object. By providing the method, it is possible to reduce the production cost, to effectively control the unbalanced load, to achieve miniaturization and light weight, and to improve the reliability by simplifying the circuit.

Claims (9)

In a device for simultaneously lighting two discharge tubes (BULB) with two ballasts consisting of a flyback converter, a full bridge inverter and a power supply unit, a PWM control unit and a gate drive unit, The full bridge inverter detects an output voltage and an output current which are output when the left (LEFT) lamp is operated through the sensing resistors R5, R7, and R8 coupled to one side of the flyback converter 10. The first inverter 20 for sensing and the second inverter for detecting and sensing the output voltage and the output current output during the right lamp operation through the sensing resistors R12, R14, and R15 and the sensing resistor R16. Divided into 30), The input voltage is inputted from the power supply unit 11, the input current is input through the resistor R10, respectively, and the output power is maintained at a predetermined level to stabilize the power supplied to each load, and output when the first inverter and the second inverter operate. A controller 40 for detecting an unbalanced load between both ends by detecting a voltage and an output current; Connected to one side of the controller 40, in order to control the unbalanced load generated during the initial driving of the lamp, first adjust the power of the higher resistance to the reference power, and then control the tube voltage of the discharge tube BULB having the small resistance to control both discharge tubes ( Step down chopper (STEP DOWN CHOPPER) 15 which makes electric power of BULB) constant, An igniter unit connected to one side of the first and second inverters to simultaneously apply a high voltage pulse to the left and right lamps so that the lamp can be ignited with high voltage at the time of initial or re-ignition of the lamp. Apparatus for simultaneously lighting two discharge vessels, characterized in that it comprises a 70 with one ballast. The first inverter 20 is connected between the sensing resistor (R7) and the resistor (R8) is connected to the output voltage detector 22 for detecting a voltage output when the left (LEFT) lamp operation, An output current detector 21 for detecting a DC current flowing through the igniter unit during the initial driving of the lamp through the sensing resistor R11 is connected, and a switching transistor S1 switched by a drive signal output from the gate driver 23. , S2, S5, S6 is connected to the device to simultaneously light the two discharge vessels with one ballast. The second inverter 30 is connected between the sensing resistor (R14) and the resistor (R15) is connected to the output voltage detector 32 for detecting a voltage output when the right lamp (RIGHT) lamp operation, the sensing Through the resistor R16, an output current detector 31 for detecting a DC current flowing through the igniter unit during initial driving of the lamp is connected, and a switching transistor S7 switched by a drive signal output from the gate driver 33. , S8, S9, S10 is connected to the device to simultaneously light the two discharge vessels in one ballast. The controller 40 according to claim 1, wherein the controller 40 has an input voltage detector 12, an input current detector 13, a PWM controller 16, an output current detector 21, 31, and an output voltage detector 22, 32 on one side. And simultaneously discharging two discharge tubes with one ballast, characterized in that the gate driving units (23, 33) are connected to each other. 2. The two discharge tubes according to claim 1, wherein the igniter portion 70 is formed in a 'ㅑ' shape by forming a primary side on one side and arranging two secondary sides in a longitudinal direction on each side of the primary side. A device that simultaneously lights up a single ballast. The method of claim 1, wherein the igniter unit 70 is formed by forming a primary side on one side and forming one of two secondary sides on the side of the primary side inward and the other on the outside to form a double stack A device that simultaneously lights up two discharge tubes characterized by one ballast. The method of claim 1, wherein the igniter unit 70 forms a primary side on one side and two secondary sides are arranged side by side on the side of the primary side to form two discharge tubes as a single ballast A device that lights up simultaneously. The controller measures the value of output voltage and input voltage so that the igniter can operate in the section where power is supplied to the ballast and the lighting is not started, and the duty ratio of the flyback converter stage is maximized until the lighting is started. Voltage control step (S110) for controlling so that high voltage is applied to the secondary side of the transformer, Simultaneously lighting two independent lamps or lamps having two discharge tubes (BULB) in one body through control of a controller in the gate driving unit (S120); A current control step S130 for allowing a large amount of current to flow through free movement of charge between the start-up and transition periods of the discharge tube BULB of the ballast BALLAST to stabilize the direct current (DC) drive; The power control step (S140) of controlling both voltage and current so that the discharge tube BULB can be normally turned on by measuring the input voltage and the current and the output voltage and the current while the ballast BALLAST goes to the stabilized state after the transition period. Method for simultaneously lighting two discharge tubes, characterized in that consisting of one ballast. The method of claim 8, wherein the simultaneous lighting step (S120) Checking the power chattering applied to the power supply unit (S200); Checking whether the condition of the discharge tube BULB is re-lighting or initial lighting (S210); Determining the full bridge converter duty ratio 2 when the condition of the discharge tube BLB is re-lit (S220); Determining the full bridge converter duty ratio 1 when the condition of the discharge tube BULB is initial lighting (S230); Summing the duty ratio 1 and the duty ratio 2 to determine an optimal duty ratio and applying a DC voltage (400 V to 600 V) suitable for driving the first and second inverters (S240); Supplying the DC voltage to the igniter unit to generate a voltage required for initial glow discharge to start discharging (S250); And discharging the discharge tube BULB simultaneously by ignition of the igniter (S260). Comparing the power of the left and right lamps at the same time of the discharge tube (S270), If the power of either of the left and right lamps is small, the first inverter detects the output voltage and output current output during the operation of the left lamp through the sensing resistors R5, R7, R8 and the sensing resistor R11. The second inverter detects and senses an output voltage and an output current which are output during the operation of the right lamp through the sensing resistors R12, R14, and R15 and the sensing resistor R16. Alternating control (S280), If the power of either of the left and right lamps is large, the step down chopper is driven through the control of the controller to adjust the power of the larger resistance to the reference power first, and then control the tube voltage of the low resistance discharge tube (BULB). By controlling the power of the both discharge tube (BULB) constant (S290), Performing control of alternating between the first inverter and the second inverter after the control of the step down chopper (S300); Simultaneous lighting of two discharge tubes with one ballast, characterized in that the step of maintaining the lighting at a constant constant power (S310).