Classifications

• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
  • H05B41/14—Circuit arrangements
  • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC
  • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters
  • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices
  • H05B41/2821—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices by means of a single-switch converter or a parallel push-pull converter in the final stage
  • H05B41/2822—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices by means of a single-switch converter or a parallel push-pull converter in the final stage using specially adapted components in the load circuit, e.g. feed-back transformers, piezoelectric transformers; using specially adapted load circuit configurations
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
  • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
  • H05B41/14—Circuit arrangements
  • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC
  • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters
  • H05B41/288—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
  • H05B41/2881—Load circuits; Control thereof

Definitions

• the present invention relates to a discharge lamp lighting device.
• HID High Intensity Discharge lamps
• a lighting circuit of a vehicle headlight using a conventional HID lamp for example, there is a discharge lamp lighting device described in Patent Document 1.
• This discharge lamp lighting device boosts the DC voltage supplied from the vehicle battery by a DC-DC booster circuit, converts it into a low-frequency AC of about 400 Hz by a DC-AC inverter circuit, and supplies it to the HID lamp. ing.
• the power supply to the HID lamp has a two-stage configuration.
• the HID lamp is turned on by applying a high-voltage pulse of about 20 kV at startup.
• a conventional lighting device for a HID lamp requires an induction unit having an inverter transformer and a gap switch.
• the large capacity and the high cost of this transformer are the factors that hinder small and low-cost HID lamp lighting devices.
• Patent Document 1 JP-A-2002-352989
• One way to achieve this is to eliminate the inductive transformer from the HID lamp lighting device. Eliminating the inadanitor transformer can achieve downsizing and low cost. The Also, in this case, power loss due to the inductance component of the inductor transformer can be eliminated.
• the load resistance of the HID lamp varies depending on the operating state of the HID lamp, and the power required for the lighting device varies accordingly.
• the HID lamp cools down after a long time. Lighting On cold start, which starts, the resistance value of the HID lamp is as low as several tens of ohms, but after the lamp is turned off, it takes too long. In a hot start where the lamp has not yet elapsed and the lamp is still hot, the resistance of the HID lamp is high. For this reason, the power supply conditions required for starting the luminous flux after the start of lighting differ between the hot start and the cold start.
• the present invention has been made to solve the above-described problems, and is directed to a discharge lamp lighting that can efficiently supply electric power suitable for the discharge characteristics of a high-intensity discharge lamp without using an inductive transformer.
• the aim is to obtain a device.
• a discharge lamp lighting device is connected between a DC power supply for supplying power to the discharge lamp, a transformer for transmitting the voltage of the DC power supply to the discharge lamp, and a primary winding of the transformer.
• the power supply from the DC power supply to the transformer is intermittent, and the current circulates on the primary side of the transformer even when there is no power supply from the DC power supply to the transformer.
• FIG. 1 is a circuit diagram showing a configuration of a high-intensity discharge lamp lighting device according to a first embodiment of the present invention. It is.
• FIG. 2 is a diagram showing a relationship between a gate signal applied to each switch and a time waveform of a current flowing through each switch according to the first embodiment of the present invention.
• FIG. 3 is a diagram showing a current path when a gate signal applied to each switch is changed according to the first embodiment of the present invention.
• FIG. 4 is a diagram showing a time waveform of a current flowing through each element according to the first embodiment of the present invention.
• FIG. 5 is a diagram showing a waveform of a current flowing through each switch according to the first embodiment of the present invention.
• FIG. 6 is a flowchart of an operation procedure until the starting force of the HID lamp also reaches steady lighting according to Embodiment 1 of the present invention.
• FIG. 7 is a diagram illustrating supply control of a current from a DC power supply according to a second embodiment of the present invention.
• FIG. 8 is a diagram illustrating supply control of a current from a DC power supply according to Embodiment 3 of the present invention.
• FIG. 9 is a diagram illustrating supply control of current from a DC power supply according to Embodiment 3 of the present invention.
• FIG. 10 is a diagram showing a configuration of an inductor of a high-intensity discharge lamp lighting device according to Embodiment 4 of the present invention.
• FIG. 11 is a diagram showing a configuration of an inductor of a high-intensity discharge lamp lighting device according to a fourth embodiment of the present invention.
• FIG. 12 is a diagram showing the relationship between the magnitude of the current flowing through the capacitor and the current flowing through the HID lamp according to the fifth embodiment of the present invention.
• FIG. 1 shows a configuration of a high-intensity discharge lamp lighting device 100 according to Embodiment 1 of the present invention.
• FIG. 1 shows a configuration of a high-intensity discharge lamp lighting device 100 according to Embodiment 1 of the present invention.
• the high-intensity discharge lamp lighting device 100 includes a DC power supply 101, a switch (switching element for power input) 102, a switch (first switching element) 103, a switch (second switching element) 104, Transformer 105, inductor (first inductance element) 106, inductor (third inductance element) 107, inductor (second inductance element) 108, capacitor (first capacitor) 109, capacitor (second capacitor) 110, equipped with HID lamp (discharge lamp) 111.
• the voltage of the DC power supply 101 is V
• the inductance of the inductor 106 is Ll
• the inductance of the inductor 107 is Lp
• the inductance of the inductor 108 is Ls
• the capacitance of the capacitor 109 is Cp
• the capacitance of the capacitor 110 is Cs.
• the switch 102 is installed between the DC power supply 101 and the primary winding of the transformer 105, and serves as a switch for supplying power to the transformer 105.
• a switch 103 and a switch 104 are further provided.
• An inductor 106 is connected in series to a secondary winding of the transformer 105, and an inductor 107 is connected in parallel.
• An inductor 108, a capacitor 109, and a capacitor 110 are connected between the secondary winding of the transformer 105 and the HID lamp 111.
• switches 102, 103, and 104 power semiconductor power devices such as MOSFETs, power transistors, and IGBTs can be used.
• a power semiconductor power device made of a wide gap semiconductor such as SiC or GaN may be used.
• the transformer 105 is a push-pull transformer, and the center of the primary winding and the DC power supply 101 are connected via a switch 102.
• the winding ratio between the primary side and the secondary side of the transformer 105 is set to a value that can supply a predetermined power even when the impedance of the HID lamp 111 increases.
• the winding ratio is such that a required voltage can be obtained in the secondary winding of the transformer 105 when the voltage of the DC power supply 101 decreases.
• the winding ratio is about 1: 1: 17.
• the value of the winding ratio is not limited to this.
• the inductor 108 and the capacitor 110 form a series resonance circuit, and the inductor 107 and the capacitor 109 form a parallel resonance circuit so as to be supplied well.
• the HID lamp 111 has four operating states: A. discharge standby, B. discharge start, C. transient discharge, and D. steady discharge. Since the load resistance value of the HID lamp 111 is different in each operation state, it is necessary to efficiently supply power according to the operation state.
• the outline of B. discharge start, C. transient discharge, and D. steady discharge will be described below.
• the HID lamp 111 breaks down and starts discharging.
• the discharge is started with this DC voltage.
• lighting was started with an impulse voltage of about 20 kV, and an initiator transformer for generating the impulse voltage was required.
• the transient discharge is a period from the start of discharge to the steady discharge in which the halogenated metal inside the HID lamp 111 is stably discharged.
• sufficient power must be provided to sustain the discharge and quickly build up the luminous flux.
• the luminous flux must be activated within a few seconds after the lighting is started.
• the resistance value of the HID lamp 111 immediately after the discharge starts differs depending on the length of time elapsed since the HID lamp 111 was turned off, and the required power supply differs.
• a hot start is a case where the lighting is started after a short time after the light is turned off.
• the cold start is performed, and the resistance value of the HID lamp 111 immediately after the lighting is started is as low as several tens ⁇ .
• the steady discharge is a state in which a stable discharge is performed inside the HID lamp 111, and during this period, it is necessary to efficiently supply constant power.
• the supply power during the steady discharge period is 35W.
• the high-intensity discharge lamp lighting device 100 performs a high-frequency lighting operation with a driving frequency of several tens of kHz.
• the HID lamp 111 is turned on at high frequency, the acoustic resonance phenomenon As a result, the arc in the HID lamp 111 becomes unstable, causing flickering or extinguishing.
• the driving frequency of the high-frequency power supply is varied.
• the HID lamp 111 can be stably turned on even at a driving frequency of several tens of kHz.
• the switch 102 is turned on. At this time, either the switch 103 or the switch 104 is turned on to supply power from the DC power supply 101. After the switch 102 is turned on for a certain period of time, the switch 102 is turned off. Thereafter, the switch 103 and the switch 104 are turned on at the same time, and the current continues to flow to the primary circuit of the transformer 105 through the primary winding of the transformer 105, the switch 103, and the switch 104. At this time, on the secondary side of the transformer 105, current flows through all circuit parts including the inductors 106, 107, 108, the capacitors 109, 110, and the HID lamp 111.
• FIG. 2 is a diagram showing a relationship between a gate signal applied to each switch of the primary circuit of the transformer 105 and a time waveform of a current flowing through each switch.
• FIG. 3 is a diagram showing a current path when a gate signal applied to each switch is changed.
• the HID lamp 111 during the transient discharge period at the time of a cold start, power of about 70 W is supplied to the HID lamp 111 to sustain the discharge, and the luminous flux is quickly started.
• FIG. 4 is a diagram showing a time waveform of a current flowing through each element. As shown in the figure, current flows through each element even during the period in which the gate signal of the switch 102 is off.
• FIG. 5 is a diagram showing a waveform of a current flowing through each switch. As shown in FIGS. 4 and 5, the peak value of the current flowing through the switch 103 or the switch 104 changes depending on whether the gate signal of the switch 102 is on or off.
• the power loss on the primary side includes, for example, conduction loss of a switching element.
• FIG. 6 is a flowchart of an operation procedure from the start of HID lamp 111 to steady lighting.
• a discharge growth period is several hundred microseconds, and a large amount of power needs to be supplied.
• a resonance circuit including a capacitor and an inductor is provided on the secondary side of The value of the element is set so as to have a frequency.
• the resonance frequency can correspond to the driving frequency of the power supplied to the HID lamp 111! /.
• an inductor 106 is connected in series with the secondary winding of the transformer 105. Thereby, the power supply efficiency at the time of a cold start is realized.
• L1 0. lmH.
• the HID lamp 111 in the high-intensity discharge lamp lighting device 100 that has been turned off for a long time, the HID lamp 111 can be efficiently used during the excessive discharge period after the HID lamp 111 is turned on. Can be powered.
• the starting since the starting is performed by applying a DC voltage, there is no igniter transformer for generating a short pulse required to start the HID lamp 111 in the related art, so that the high-intensity discharge lamp lighting device 100 can be downsized.
• the desired power is supplied to the HID lamp 111 by determining the ON / OFF timing of the switch 102 based on the cycle of the current flowing through the secondary winding of the transformer 105.
• FIG. 7 is a diagram illustrating control of current supply from DC power supply 101 according to the second embodiment.
• the ON time of the switch 102 is set to be NZ2 (N is a natural number) times the oscillation period with respect to the period of the current flowing through the secondary winding of the transformer 105.
• N is a natural number
• the ON time of the switch 102 is 1Z2 times the oscillation period, and the OFF time is 2Z2 times the oscillation period.
• the ON time of the switch 102 is 2Z2 times the oscillation period, and the OFF time is 4Z2 times the oscillation period.
• the ON time of the switch 102 operates at different times of 3Z2 times, 2Z2 times, and 1Z2 times of the oscillation period.
• Off time is 3Z2 times and 1Z2 times of oscillation cycle It has become.
• the ON / OFF control of the switch 102 may be periodically performed at the same timing as in Example 1 or Example 2.
• the on / off operation may be performed with different on-time and off-time as in Example 3.
• the switch 102 When the switch 102 is off, the current flowing through the secondary winding of the transformer 105 can be prevented from becoming zero. Also, by setting the off time of the switch 102 to be NZ2 times the oscillation period of the current flowing through the secondary winding of the transformer 105, the current when the switches 103 and 104 are turned off becomes zero, and the switching loss is reduced. The efficiency of power supply can be improved.
• the ON time of the switch 102 is adjusted to a length corresponding to the duty cycle of NZ2 times the oscillation period of the current flowing through the secondary winding of the transformer 105 so that desired power is supplied to the HID lamp 111. You can.
• the on-time of switch 102 is adjusted based on the oscillation period of the current flowing through the secondary winding of transformer 105, so that a long time has elapsed since the light was turned off.
• Electric power can be supplied to the HID lamp 111.
• the on / off timing of the switch 102 is determined by using the switch 103 and the switch 1.
• the desired power is supplied to the HID lamp 111 by making a determination based on the oscillation cycle of the current flowing through the 04.
• the off time of the switch 102 is N times the oscillation period of the switches 103 and 104.
• the ON time of the switch 102 is set to 1Z2 times the oscillation period of the current of the switch 103 and the switch 104. Further, the off time of the switch 102 is set to be one time the oscillation cycle of the current of the switches 103 and 104.
• the ON time of the switch 102 is 1Z2 times the oscillation period of the current of the switch 103 and the switch 104, and the OFF time of the switch 102 is twice the oscillation period of the current of the switch 103 and the switch 104.
• the ON time of the switch 102 is 2Z2 times the oscillation period of the current of the switch 103 and the switch 104, and the ON time of the switch 102 is The off time is set to twice the oscillation period of the current of the switches 103 and 104.
• the off period of the switch 102 by changing the off period of the switch 102 according to the load current or load power on the secondary side of the transformer 105, power can be supplied more efficiently.
• the ON duty ratio of the switch 102 may be changed.
• the on / off control of the switch 102 may be periodically performed at the same timing as shown in FIGS. 2, 8, and 9.
• the ON time of the switch 102 is adjusted by the duty ratio with respect to NZ2 times the oscillation cycle of the current flowing through the switches 103 and 104 so that desired power is supplied to the HID lamp 111. Is also good.
• the on-time of switch 102 is adjusted based on the oscillation cycle of the current flowing through switch 103 and switch 104.
• the HID lamp 111 is turned on, power can be efficiently supplied to the HID lamp 111 during an excessive discharge period after the lighting is started.
• each inductor formed on the secondary side of the transformer 105 is more preferable.
• FIG. 10 and 11 are diagrams showing the configuration of the inductor of high-intensity discharge lamp lighting device 100 according to the fourth embodiment.
• any two of the inductor 106, the inductor 107, and the inductor 108 on the secondary side of the transformer 105 are formed using the same core. Thereby, the volume of the high-intensity discharge lamp lighting device 100 can be reduced.
• the inductor 106 connected in series to the secondary winding of the transformer 105 is formed using the leakage inductance of the secondary winding of the transformer 105.
• the volume of the high-intensity discharge lamp lighting device 100 can be reduced.
• the volume of the inductor on the secondary side of transformer 105 is reduced, so that high-intensity discharge lamp lighting device 100 can be downsized.
• the capacitance value Cp of the capacitor 109 and the capacitance value Cs of the capacitor 110 are set to more preferable values.
• FIG. 12 shows the relationship between the values of Cp and Cs and the current flowing through the HID lamp 111 and the capacitor 109. As shown in the figure, when the values of Cp and Cs are equal, the currents flowing through the HID lamp 111 and the capacitor 109 are equal. When Cs is larger than Cp, the current flowing through the HID lamp 111 becomes larger than the current flowing through the capacitor 109. That is, by setting Cs to a value larger than Cp, more current flows to the HID lamp 111 and more power can be supplied to the HID lamp 111.
• the efficiency of power supply to the HID lamp 111 is improved by setting the capacitance Cs of the capacitor 110 to a value larger than the capacitance Cp of the capacitor 109. be able to.
• the discharge lamp lighting device according to the present invention is suitable for use in vehicle-mounted headlights and the like.

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• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Circuit Arrangements For Discharge Lamps (AREA)

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• 2004
  • 2004-04-07 JP JP2004113336A patent/JP2005302378A/ja active Pending
• 2005
  • 2005-04-06 CN CNA2005800105322A patent/CN1939097A/zh active Pending
  • 2005-04-06 DE DE112005000771T patent/DE112005000771T5/de not_active Withdrawn
  • 2005-04-06 US US10/589,266 patent/US20070164685A1/en not_active Abandoned
  • 2005-04-06 WO PCT/JP2005/006782 patent/WO2005099317A1/ja not_active Ceased

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