WO2006011288A1 - 放電灯点灯装置 - Google Patents
放電灯点灯装置 Download PDFInfo
- Publication number
- WO2006011288A1 WO2006011288A1 PCT/JP2005/009555 JP2005009555W WO2006011288A1 WO 2006011288 A1 WO2006011288 A1 WO 2006011288A1 JP 2005009555 W JP2005009555 W JP 2005009555W WO 2006011288 A1 WO2006011288 A1 WO 2006011288A1
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- WIPO (PCT)
- Prior art keywords
- power supply
- circuit
- voltage
- discharge lamp
- current
- Prior art date
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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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0083—Converters characterised by their input or output configuration
- H02M1/0087—Converters characterised by their input or output configuration adapted for receiving as input a current source
Definitions
- the present invention relates to a discharge lamp used as a headlamp of an automobile or the like, or a discharge lamp lighting device for lighting a discharge lamp used as an illumination lamp or street lamp in an indoor / outdoor facility, warehouse, factory, etc.
- the present invention relates to a discharge lamp lighting device in which a current supplied from a DC power source that operates the lighting device is controlled based on a total current value flowing to a load.
- high-intensity discharge lamps such as metal halide bulbs, high-pressure sodium bulbs, and mercury bulbs have advantages such as high luminous flux, high lamp efficiency, and long life. Therefore, it has been used for lighting and street lamps in indoor and outdoor facilities, warehouses and factories. Particularly in recent years, it is also being used as a headlamp for vehicles such as automobiles. In order to light up this type of discharge lamp, it is necessary to apply a predetermined voltage to the bulb at the start-up, and to superimpose a high-voltage start pulse, which is a stable function for stably lighting the discharge lamp.
- DC-DC converter DC-DC converter, etc.
- AC power supply circuit AC power supply circuit
- igniter starting circuit
- DC-DC converter DC power supply circuit
- DC-DC converter DC-DC converter
- AC power supply circuit AC power supply circuit
- igniter starting circuit
- a current detection resistor is provided on the primary feeder side to detect the input current (power supply current) to the DC power supply circuit.
- a current limit control unit is provided for performing current limitation on the input current to the DC power supply circuit in accordance with the detection signal to prevent overcurrent from the DC power supply (see, for example, Patent Document 2).
- Patent Documents 3 to 6 As conventional techniques related to power supply in the discharge lamp lighting device.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2001-43989
- Patent Document 2 JP-A-7-169585
- Patent Document 3 JP-A-6-188078
- Patent Document 4 Japanese Patent Laid-Open No. 9-223590
- Patent Document 5 Japanese Patent Laid-Open No. 2002-110384
- Patent Document 6 Japanese Unexamined Patent Publication No. 2003-323992
- a conventional discharge lamp lighting device is configured as described above, and in particular, Conventional Example 1 is a technique for preventing overcurrent against a ground fault. For reasons other than ground faults, it is excluded.
- the step-up DCZDC converter used in the DC power supply circuit (DC-DC converter) of the conventional example 1 is a single-unit step-up transformer.
- the improved step-up transformer has the advantage that the core with fewer wires can be made smaller and more convenient. Therefore, if the current detection resistor can be provided between the direct current power source and the lighting device as in the conventional example 2 in the configuration of the conventional example 1, it is advantageous that the effect of the conventional example 2 can be achieved.
- the load current of the DC power supply is a DCZDC converter transformer in which the primary and secondary windings are separated. Unlike the conventional example # 2, it flows not only to the DC power supply circuit but also to the subsequent inverter circuit. In other words, the load current from one DC power supply is shunted to multiple load circuits such as DC power supply circuit and inverter circuit. Will be. For this reason, even if a current detection resistor is provided between the DC power supply and the lighting device as in conventional example 2, the potential on the load side of this current detection resistor fluctuates with the current, and this fluctuation causes the output flowing to the inverter circuit. The potential across the resistor for current detection also fluctuated, and there was a problem that the power supply current could not be detected accurately due to these fluctuations.
- the present invention has been made to solve the above-described problems, as in the case where a single step-up transformer is used as a transformer forming a DC power supply circuit (DC-DC converter).
- a discharge lamp lighting device configured to shunt load current from a single DC power supply to multiple load circuits such as a DC power supply circuit and an inverter circuit, the power supply current supplied to this single DC power supply can be accurately measured.
- the purpose is to obtain a discharge lamp lighting device that controls the current supplied from the DC power source based on the detection result.
- a discharge lamp lighting device connects a plurality of load circuits to a DC power supply, converts a voltage from the DC power supply into a predetermined DC voltage, converts the voltage to an AC voltage, and supplies the AC voltage to the discharge lamp.
- a power supply circuit and a starter circuit that generates a high-voltage pulse to superimpose and apply the high-voltage pulse to the discharge lamp to start discharge, and the control unit is based on a total value of currents flowing through a plurality of load circuits.
- the DC power supply also controls the supplied current.
- FIG. 1 is a circuit diagram showing a basic configuration of a discharge lamp lighting device according to Embodiment 1 of the present invention.
- FIG. 2 relates to a discharge lamp lighting device according to Embodiment 1 of the present invention.
- (A) is a current waveform diagram of a primary side current detection resistor (R1), and
- (b) is an output current detection resistor (R2). It is a current waveform diagram
- FIG. 3 is a circuit configuration diagram of a total current detector of the discharge lamp lighting device according to Embodiment 1 of the present invention.
- FIG. 4 is a circuit configuration diagram of a current detector of a discharge lamp lighting device according to Embodiment 2 of the present invention. is there.
- FIG. 5 is a circuit configuration diagram of a current detector of a discharge lamp lighting device according to Embodiment 3 of the present invention.
- FIG. 6 is a circuit configuration diagram of a current detector of a discharge lamp lighting device according to Embodiment 4 of the present invention.
- FIG. 7 is a circuit configuration diagram of a current detector of a discharge lamp lighting device according to Embodiment 5 of the present invention.
- FIG. 8 is a timing relationship diagram between a current (a) supplied from a DC power supply and an output signal (b) of a comparator, for a discharge lamp lighting device according to Embodiment 5 of the present invention.
- FIG. 9 is a circuit configuration diagram of a discharge lamp lighting device according to Embodiment 6 of the present invention.
- FIG. 1 is a circuit diagram showing a basic configuration of a discharge lamp lighting device according to Embodiment 1 of the present invention.
- this discharge lamp lighting device consists of DC power supply 1, DC power supply circuit 2, inverter circuit 3, igniter 4, primary-side current detection resistor 5 (R1), and output current detection resistor 6 (R2).
- the current detection unit 7 and the control unit 8 are included.
- the DC power source 1 is a DC power source such as a battery having a DC voltage Vb.
- the DC power supply circuit 2 is a DC-DC converter.
- a single-unit step-up transformer 21 (hereinafter referred to as “single transformer 21”) and the AC voltage generated in the single transformer 21 are converted into a direct current voltage.
- DC power source 1 power applied to the primary side of single transformer 21 It is converted to DC voltage Vo and output from the secondary side of this single transformer 21.
- the inverter circuit 3 includes an H bridge circuit including four FETs 31, 32, 33, and 34, and an H bridge circuit. It is composed of the bridge circuit FET31, 34 and FET32, 33, which are alternately turned on and off, and the H bridge driver 35, which converts the DC voltage Vo from the DC power supply circuit 2 into a rectangular AC voltage. Convert.
- the DC power supply circuit 2 and the inverter circuit 3 form a power supply circuit in a broad sense in a discharge lamp lighting device.
- the igniter 4 generates a high voltage pulse for start-up based on the voltage from the DC power supply circuit 2, applies it to the discharge lamp 9 to start discharge, and applies this high voltage pulse to the discharge lamp 9. To start lighting.
- the primary-side current detection resistor 5 (R1) forms the first load current detection means, and the primary-side current of the single transformer 21 of the DC power supply circuit 2 that flows by the DC voltage Vb of the DC power supply 1 is obtained. Detect as a voltage signal. This current is the load current of the DC power source 1.
- Figure 2 (a) shows an example of the current waveform that flows through the primary-side current detection resistor 5 (R1).
- the output current detection resistor 6 forms a second load current detection means, and detects the output current of the inverter circuit 3 and subsequent flowing through the DC voltage Vb of the DC power source 1 as a voltage signal. This output current also detects the current force flowing through the inverter circuit 3, but the inverter circuit
- Figure 2 (b) shows an example of the current waveform that flows through the output current detection resistor 6 (R2).
- the maximum current value (Im2) is approximately 0.4 A, and one cycle (T2) is approximately 1.25 ms. Indicates that current is flowing.
- the total current detection unit 7 includes a primary-side current detection resistor 5 (R1) and an output current detection resistor 6
- the control unit 8 controls the output power by switching the switching transistor 24 of the DC power supply circuit 2 based on the total current value detected by the total current detection unit 7, thereby controlling the output power from the DC power supply 1. Controls the current supplied lb.
- FIG. 3 shows the circuit configuration of the total current detector 7A of the discharge lamp lighting device according to the first embodiment. It is a chart.
- this total current detection is composed of resistors 701 (R3), 702 (R4), 703 (R5), 704 (R6), and amplifier 705 to form a summing amplifier circuit. ing.
- the amplifier 705 is composed of, for example, an operational amplifier (op amp).
- the resistor 701 (R3) is connected to the primary current detection resistor 5 (R1)
- the resistor 702 (R4) is connected to the output current detection resistor 6 (R2).
- the voltage signal of the primary side current of the DC power supply circuit 2 detected by the primary side current detection resistor 5 (R1) through these both resistors 701 (R 3) and 702 (R4), and the output current detection resistor 6 The voltage signal of the output current after inverter circuit 3 detected in (R2) is combined, and this combined voltage signal is input to the positive phase input terminal (+ terminal) of amplifier 705.
- resistors 703 (R5) and 704 (R6) are connected to the negative phase input terminal (-terminal) as shown in the figure.
- the signal Sa of the total current value output from the amplifier 705 is sent to the control unit 8, and the control unit 8 performs switching control of the switching transistor 24 of the DC power supply circuit 2 based on the signal Sa of the total current value.
- the control unit 8 controls the output power so that the DC voltage Vo of the DC power supply circuit 2 is maintained substantially constant within the overcurrent limit value of the DC power supply 1 set in advance by the signal Sa of the total current value.
- the output power of the DC power supply circuit 2 is limited and the current supplied from the DC power supply 1 is limited.
- the primary side of the DC power supply circuit 2 from the DC power supply 1 The primary current value that is shunted to the primary side is detected by the primary current detection resistor 5, while the output current value that is shunted from the DC power supply 1 to the inverter circuit 3 and later is detected by the output current detection resistor 6, and these are detected.
- the total current value flowing to the load circuits such as the DC power supply circuit 2 and the inverter circuit 3 is detected by the total current detection unit 7, and this detected total current is detected.
- the control unit 8 is configured to control the output power by controlling the switching transistor 24 of the DC power supply circuit 2 based on the value, so that the current lb supplied from the DC power supply 1 is controlled.
- a discharge lamp lighting device configured to divert load current from a single DC power source 1 to a plurality of load circuits such as a DC power source circuit 2 and an inverter circuit 3 as when a single transformer 21 is used for 2 .
- This one straight It can accurately detect the current value corresponding to the power supply current value flowing out of the power supply 1, the current lb supplied from the DC power source 1 to the detection result based on can be appropriately controlled.
- the control unit 8 limits the output power of the DC power circuit 2 and is supplied from the DC power source 1. Since it is configured to limit the overcurrent against the current, it is possible to protect the load circuit such as the DC power supply 1 and the DC power supply circuit 2 from overcurrent force.
- the total current detection unit 7A adds each signal of the primary side current value detected by the primary side current detection resistor 5 and the output current value detected by the output current detection resistor 6 by the amplifier 705. Since it is configured to amplify, and both are added without error with a simple circuit configuration, it is possible to accurately detect the current value corresponding to the power supply current value flowing out to multiple load circuits. .
- FIG. 4 is a circuit configuration diagram of the total current detection unit 7B of the discharge lamp lighting device according to Embodiment 2 of the present invention. Components identical to those in FIG. 3 are given the same reference numerals, and explanations of those identical components are omitted.
- the total current detector 7B is the same amplifier as in FIG.
- a comparator 706 is provided after the summing amplifier circuit composed of 705, etc., and an integration circuit consisting of a resistor 707 (R7) and a capacitor 708 (C1) is added to this comparator 706 to add an integration function. It is a thing.
- This integration circuit as an integration function is provided so as not to react to instantaneous fluctuations such as noise.
- Comparator 706 is composed of an operational amplifier, for example, and its positive phase input terminal (+ terminal) is set to a voltage Vs obtained by dividing DC voltage Vcc by resistors 709 (R8) and 710 (R9). is doing.
- This voltage Vs is the reference setting value for overcurrent determination (hereinafter referred to as “reference setting value Vs”).
- This reference set value Vs is divided using a stabilized DC voltage Vcc such as 3V or 5V, etc., so that it becomes a stable reference set value Vs without fluctuation.
- a comparator circuit is formed by the comparator 706, the resistor 709 (R8), the resistor 710 (R9), and the like.
- the total current value signal Sa output from the amplifier 705 is input to the negative-phase input terminal (one terminal) of the comparator 706 via the resistor 707 (R7), and the positive-phase input terminal (+ Is compared with the reference set value Vs set to the terminal.
- the signal Sa of the total current value is subjected to integration by the integrating circuit consisting of the resistor 7 07 (R7) and the capacitor 708 (C1).
- the vessel 706 is avoided from this effect. For example, even if the signal Sa of the total current value becomes an instantaneous large current due to the influence of noise or the like, the comparator 706 is not affected by this.
- the constants of the resistor 707 (R7) and capacitor 708 (C1) that determine the time constant of this integration circuit can be set arbitrarily, and the required response characteristics can be easily realized by optimizing this constant setting. .
- the comparator 706 sets the control unit 8 to the normal control state.
- the control unit 8 shown in FIG. 1 controls the output power by switching the switching transistor 24 so that the DC voltage Vo of the DC power supply circuit 2 is maintained substantially constant, and the output power is supplied from the DC power supply 1. To control the current lb.
- the comparator 706 outputs a signal (Sb) for instructing overcurrent limitation to the control unit 8.
- the control unit 8 controls the switching transistor 24 of the DC power supply circuit 2 according to the input instruction signal to limit the output power, and limits the overcurrent to the current supplied from the DC power supply 1.
- the total current detection unit 7B detects the primary current value detected by the primary current detection resistor 5 and the output current detection resistor 6.
- Each signal of the output current value is added and amplified by the amplifier 705, and the output of this amplifier 705 is input to the comparator 706 via the resistor 707 (R7) forming the integrating circuit and compared with the reference set value Vs. 6 indicates that when the output from the amplifier 705 exceeds the reference set value Vs, the output power of the DC power supply circuit 2 is limited, and a signal Sb for instructing the overcurrent limit for the current supplied from the DC power supply 1 is sent to the control unit. Since it is configured to output to 8, the primary current of the DC power supply circuit 2 is reduced, thereby limiting the current that flows out of the DC power supply 1 and the load on the DC power supply 1 and DC power supply circuit 2 etc. The circuit can be protected against overcurrent.
- the comparator 706 is provided with a resistor 707 (R7), a capacitor 708 (C1), and an integrating circuit that also has a force, so that the signal Sa of the total current value from the amplifier 705 is, for example, noise or the like. Even if the instantaneous current becomes large due to the influence of the above, the comparator 706 can be prevented from being affected by this influence.
- FIG. 5 is a circuit configuration diagram of the total current detection unit 7C of the discharge lamp lighting device according to Embodiment 3 of the present invention. Components identical to those in FIG. 3 are given the same reference numerals, and explanations of those identical components are omitted.
- the total current detection unit 7C includes an amplifier 711 (hereinafter referred to as “amplifier”) that amplifies a voltage signal representing the output current after the inverter circuit 3 detected by the output current detection resistor 6 (R2).
- “first amplifier 711” is provided, and the amplified output is connected to the amplifier 705 (hereinafter referred to as this embodiment) that forms the summing amplifier circuit of FIG. 3 via the resistor 712 (R10).
- the voltage amplification factor ⁇ 2 of the second amplifier 705 operating as a positive phase amplifier Is not necessarily the same as in Fig. 3.
- the resistor for setting the amplification is changed from the configuration in Fig. 3 and the resistors are 713 (R11) and 714 (R12)
- the primary-side current detection resistor 5 (R1) and the output current detection resistor 6 (R2) have as low resistance as possible in order to reduce power consumption.
- the lower the resistance the smaller the voltage drop and the lower the current detection accuracy.
- the current flowing through the output current detection resistor 6 (R2) is very small compared to the current flowing through the primary side current detection resistor 5 (R1). Therefore, by amplifying the voltage signal from the output current detection resistor 6 (R2) by the first amplifier 711, even if the output current detection resistor 6 (R2) has a low resistance, the current detection accuracy is lowered. It will be avoided.
- the voltage signal output from the first amplifier 711 passes through the resistor 712 (R10), and the voltage signal from the primary-side current detection resistor 5 (R1) input through the resistor 701 (R3).
- This combined voltage signal is input to the positive phase input terminal (+ terminal) of the second amplifier 705, and the operation is the same as in FIG.
- the second amplifier 705 from the second amplifier 705, the primary side current of the DC power supply circuit 2 flowing in the primary side current detection resistor 5 (R1) and the inverter circuit 3 and subsequent channels flowing in the output current detection resistor 6 (R2)
- a signal Sc of the total current value obtained by adding the output current is detected and output to the control unit 8.
- the operation of the control unit 8 is as described in FIG.
- the ratio of each resistor taking into account the voltage amplification degree K of the first amplifier 711,
- the total current detection unit 7C amplifies the signal of the output current value detected by the output current detection resistor 6 using the first amplifier 711, and Since the amplifier 711 output signal and the primary current value signal detected by the primary current detection resistor 5 are added and amplified by the second amplifier 705, the output current detection resistor 6 (R2) can be used to reduce power consumption. Even if the resistance is low, the current detection accuracy can be prevented from being lowered, and the second amplifier 705 can obtain a summed amplified output with little error.
- FIG. 6 is a circuit configuration diagram of the total current detection unit 7D of the discharge lamp lighting device according to Embodiment 4 of the present invention. The same parts as those in FIG. 3 or FIG. The description with the same sign is omitted.
- the total current detection unit 7D includes an overcurrent determination function by the comparator 706 described in the second embodiment (FIG. 4) and an increase described in the third embodiment (FIG. 5). This is provided with an amplifying function by the width device 711.
- the operation of the portion composed of the resistor 701 (R3), the amplifier 711, and the resistor 712 (R10) in FIG. 6 is as described in FIG. 5 and the primary side current that has passed through the resistor 701 (R3).
- the voltage signal obtained by synthesizing the voltage signal from the detection resistor 5 (R1) and the voltage signal from the output current detection resistor 6 (R2) via the amplifier 711 and the resistor 712 (R10) is composed of, for example, an operational amplifier. Input to the negative phase input terminal (one terminal) of comparator 715.
- the positive phase input terminal (+ terminal) of this comparator 715 has a reference set value Vs for overcurrent determination, which is obtained by dividing the DC voltage Vcc by resistors 716 (R13) and 717 (R14), as in Fig. 4. Is set. Similarly to FIG. 4, this reference set value Vs is divided by using a stabilized DC voltage Vcc such as 3V or 5V, etc., to obtain a stabilized reference set value Vs having no fluctuation.
- the comparator 715, the resistor 716 (R13), the resistor 717 (R14), etc. form a comparator circuit.
- the comparator 715 is provided with an integration circuit formed by resistors 701 (R3) and 712 (R10) and a capacitor 708 (C1) to reduce instantaneous fluctuations such as noise. I try not to react.
- the operation of the comparator 715 is basically the same as that of the comparator 706 in FIG. 4, and is input through an integrating circuit composed of resistors 701 (R3) and 712 (R10) and a capacitor 708 (C1).
- the comparator 715 sets the control unit 8 to the normal control state.
- the control unit 8 shown in FIG. 1 controls the output power by switching the switching transistor 24 so that the DC voltage Vo of the DC power supply circuit 2 is maintained substantially constant, and is supplied from the DC power supply 1.
- control unit 8 follows the input instruction signal to switch the switching power supply of the DC power supply circuit 2.
- the output power is limited by switching control of the transistor 24, and overcurrent is limited to the current supplied from the DC power supply 1.
- the comparator 715 may use the second amplifier 705 described in Embodiment 3 (FIG. 5) as the comparator 715. In this case, the amplifier 711 may be deleted. Thus, the adder amplifier and the overcurrent detection comparator can be integrated. Further, the integrated amplifier composed of the capacitor 708 (C1) or the like may be attached to the integrated adder amplifier.
- the total current detection unit 7D amplifies the signal of the output current value detected by the output current detection resistor 6 using the first amplifier 711, and 1
- the signal obtained by combining the output signal of the amplifier 711 and the primary current value signal detected by the primary current detection resistor 5 is input to the comparator 715 and compared with the reference set value Vs.
- the unit 715 limits the output power of the DC power supply circuit 2 and instructs the current supplied from the DC power supply 1 to limit overcurrent. Since it is configured to output Se to the control unit 8, the primary current of the DC power supply circuit 2 is reduced, thereby limiting the current that flows out of the DC power supply 1, and the DC power supply 1 and DC power supply circuit 2 etc. load circuit can be protected from overcurrent.
- the comparator 715 is provided with an integrating circuit composed of resistors 701 (R3), 712 (R10) and a capacitor 708 (C1), so that the signal Sd of the total current value is, for example, noise.
- the comparator 715 can be prevented from being affected by an instantaneous large current due to the influence of the above.
- the adder amplifier and the overcurrent detection comparator are integrated.
- the integration circuit having the equal force of the capacitor 708 (C1) it is possible to provide a reaction characteristic that does not react to an instantaneous large current.
- the functions of current addition, comparison, and reaction characteristics required for overcurrent limiting can be realized with a simple configuration.
- FIG. 7 shows the circuit of the total current detector 7E of the discharge lamp lighting device according to Embodiment 5 of the present invention.
- FIG. 7 The same parts as those in FIG. 3, FIG. 5 or FIG. 6 are given the same reference numerals, and explanations of these same reference numerals are omitted.
- the total current detection unit 7E includes a transistor (PNP type) 718 and a base voltage setting resistor 719 (R15) and a transistor 718 for the configuration of the fourth embodiment.
- a resistor 720 (R16) is provided. This component forms an integrator circuit voltage setting means!
- the purpose of the transistor 718 and the like is to improve the response to the integration circuit formed by the resistors 701 (R3) and 712 (R10) and the capacitor 708 (C 1) in the comparator 715.
- the improvement in responsiveness using the transistor 718 and the like is described with reference to FIG.
- Fig. 8 is a timing relationship between the current lb (Fig. 1) supplied from the DC power source 1 and the output signal Sf with respect to the time of the comparator 715, and (a) shows the former current lb. , (B) shows the latter output signal (voltage signal) Sf.
- the current lb must be an overcurrent !, low before the timing ta !, and the input current (steady current) Ibl is turned on between the collector (C) and the emitter (E) Short capacitor 708 (C1).
- Ve ⁇ (R16 -Vcc) / (R15 + R16) ⁇ + 0.7 (V)
- FIG. 8 (b) shows the above-mentioned emitter voltage Ve in the ON state.
- This emitter voltage V e is also the level of the output signal Sf of the comparator 715, and is a constant value as long as the power supply voltage Vcc does not fluctuate. It becomes. Therefore, when the current lb becomes the overcurrent Ib2 after the timing ta, the level at the start of falling is the above-mentioned emitter voltage Ve. As a result, the fall time until reaching the output signal Sfo to start overcurrent limit becomes Tn.
- the downward slope is determined by the integration constants of the resistors 701 (R3) and 712 (R10) and the capacitor 708 (C1), as in the case where the transistor 718 is not provided.
- the fall time Tn means that it is possible to shorten the time for starting the overcurrent limit, which is shorter than the fall time Tm when the transistor 718 is not provided, and to speed up the response of the overcurrent limit. .
- the total current detection unit 7E has a resistance provided in the comparator 715 with respect to the configuration of the total current detection unit 7D in the fourth embodiment (FIG. 6). Since the integration circuit voltage setting means for limiting the output voltage of the integration circuit formed by 701 (R3), 71 2 (R10) and the capacitor 708 (C1) is provided, the output of the integration circuit (transistor 718 Since the emitter is previously limited to the predetermined voltage (Ve) and is waiting, the time until the comparator 715 outputs the signal Sf instructing the start of the overcurrent limit to the control unit 8 is shortened. be able to. As a result, it is possible to realize an integration circuit that responds quickly to a continuous overcurrent without reacting to an instantaneous large current, and can perform overcurrent limitation with quick response.
- FIG. 9 is a circuit configuration diagram of a discharge lamp lighting device according to Embodiment 6 of the present invention, which is a discharge lamp lighting device for lighting left and right headlamps of an automobile.
- the DC power supply 1 is loaded with the DC power supply circuit 2 and the inverter circuit 3 in the discharge lamp lighting device including one discharge lamp lighting circuit.
- the discharge lamp lighting device according to the sixth embodiment shown in FIG. 9 includes two discharge lamp lighting circuits, and each of the two discharge lamp lighting circuits is used as a load of the DC power source 1.
- the discharge lamp lighting device includes a DC power source 11, a first discharge lamp lighting circuit 12, a second discharge lamp lighting circuit 13, and a first load current detection resistor 14 (R12 1 ), The second load current detection resistor 15 (R131), the total current detection unit 16 and the control unit 17, and the first discharge lamp lighting circuit 12 lights the discharge lamp 18 for the right headlamp of the automobile.
- the second discharge lamp lighting circuit 13 is for lighting a discharge lamp 19 for a left headlamp of an automobile.
- the DC power source 11 corresponds to the DC power source 1 of FIG. 1, and is a DC power source such as a knottery, for example, of the DC voltage Vb.
- the first discharge lamp lighting circuit 12 and the second discharge lamp lighting circuit 13 have the same configuration, and the transformer 121 (131) of the DCZDC converter for boosting in which the primary side and the secondary side are separated from each other MOS FET switching transistor 122 (132) that performs switching operation for this transformer 121 (131), rectifier diode 123 (133) that converts the AC voltage generated in this transformer 121 (131) to DC voltage, and smoothing
- the DC voltage Vb applied from the DC power supply 11 to the primary side of the transformer 121 (131) is converted into a DC voltage Vo of a predetermined voltage value by using the power of the capacitor 124 (134) for the transformer 121 (131).
- a DC power supply circuit that outputs from the secondary side, and an inverter circuit 125 (135) that converts the DC voltage Vo converted to DC by the rectifier diode 123 (133) and the smoothing capacitor 124 (134) into rectangular wave AC, Based on the rectangular wave AC converted by this inverter circuit 125 (13 5) It comprises an igniter 126 (136) for generating a high voltage pulse for starting and applying it to the discharge lamp 18 (19) to start discharge.
- Each of the first discharge lamp lighting circuit 12 and the second discharge lamp lighting circuit 13 uses a transformer 121 (131) in which the primary side and the secondary side are separated from each other, except for the above point. The part is basically the same as the configuration in FIG.
- the DC power supply circuit and the inverter circuit 125 (135) form a power supply circuit in a broad sense in this discharge lamp lighting device.
- the first load current detection resistor 14 (R121) and the second load current detection resistor 15 (R1 31) form load current detection means, respectively, from the DC voltage Vb of the DC power supply 11 to the first
- the current flowing to the discharge lamp lighting circuit 12 or the second discharge lamp lighting circuit 13 is detected as a voltage signal.
- These currents are load currents of the DC power supply 11.
- the total current detection unit 16 corresponds to the total current detection unit 7 of FIG. 1, and the load detected by the first load current detection resistor 14 (R121) and the second load current detection resistor 15 (R131). Based on the current, the total current value flowing to these multiple load circuits is detected.
- the control unit 17 corresponds to the control unit 8 of FIG. 1, and based on the total current value detected by the total current detection unit 16, the first discharge lamp lighting circuit 12 and the second discharge lamp lighting circuit 13 The current lb supplied from the DC power supply 11 is controlled by each switch.
- the specific internal configuration of the total current detection unit 16 shown in FIG. 9 corresponds to the total current detection unit 7A described in the first embodiment (FIG. 3), and resistors 161 (R161), 162 (R162), 163 (R163 ), 164 (R164), and an amplifier 165 composed of, for example, an operational amplifier, forming an addition amplifier circuit.
- the resistor 161 (R161) is connected to the first load current detection resistor 14 (R121), and the resistor 162 (R162) is connected to the second load current detection resistor 15 (R131).
- the voltage signal of the load current of the first discharge lamp lighting circuit 12 detected by the first load current detection resistor 14 (R121) through these resistors 161 (R161) and 162 (R162) 2 is combined with the voltage signal of the load current of the second discharge lamp lighting circuit 13 detected by the load current detection resistor 15 (R131), and this combined voltage signal is combined with the positive phase input terminal (+ Terminal).
- Resistors 163 (R163) and 164 (R164) are connected to the negative phase input terminal (one terminal) as shown in the figure, and this amplifier 165 is a positive phase amplifier similar to the total current detection unit 7A.
- the amplifier 165 amplifies the first load current detection resistor 14 (R121) from the amplifier 165 to load current of the first discharge lamp lighting circuit 12 and the second load current detection resistor. 15, a signal Sg having a total current value obtained by adding the load current of the second discharge lamp lighting circuit 13 flowing in (R131) is detected and output. As a result, a signal Sg having a total current value corresponding to the current lb supplied from the DC power supply 11 is obtained.
- the total current value signal Sg output from the amplifier 165 is sent to the control unit 17, and the control unit 17 uses the total current value signal Sg to generate the first discharge lamp lighting circuit 12 and the second
- the current lb supplied from the DC power source 11 is controlled by controlling the switching power of the switching transistors 122 and 132 of the discharge lamp lighting circuit 13 and controlling the output power.
- the control unit 17 determines the DC output voltage Vo of each of the first discharge lamp lighting circuit 12 and the second discharge lamp lighting circuit 13 within the overcurrent limit value of the DC power source 1 set by the signal Sg of the total current value.
- the output power is controlled so as to maintain a substantially constant value.On the other hand, when the total current value signal Sg exceeds this overcurrent limit value, the first discharge lamp lighting circuit 12 and the second discharge lamp are lit.
- the output power of each DC power supply circuit of circuit 13 is limited, and overcurrent is limited to the current supplied from DC power supply 11.
- the force that the specific internal configuration of the total current detection unit 16 corresponds to the total current detection unit 7A of the first embodiment is not limited to this. It may be equivalent to the total current detection unit 7B of the form 2 (FIG. 4).
- the comparator 706 of the total current detector 7B may have an amplification function so that the adder amplifier and the overcurrent detector comparator are integrated (not shown).
- the integration circuit voltage setting means described in the fifth embodiment may be added to the capacitor 708 (C1) forming the integration circuit of the total current detection unit 7B! / (Not shown) )
- the configuration of FIG. 9 is a force in which the load of the DC power source 11 is made into two systems of the first discharge lamp lighting circuit 12 and the second discharge lamp lighting circuit 13 having the same configuration.
- the total current detector 16 detects the total current value by adding and summing the load currents from these three or more loads, and based on the detected total current value, the three or more systems as described above. Switching control of each switching transistor of the DC power supply circuit in the load of!
- the current value shunted from the DC power source 11 to the first discharge lamp lighting circuit 12 is detected by the first load current detection resistor 14, while the DC The current value shunted from the power source 11 to the second discharge lamp lighting circuit 13 is detected by the second load current detection resistor 15, and the first discharge lamp lighting circuit 12 and the second discharge lamp lighting circuit 12 are detected based on the detected current values. 2 free
- the total current value flowing to the load circuit such as the lamp lighting circuit 13 is detected by the total current detection unit 16, and the control unit 17 uses the detected total current value to control the first discharge lamp lighting circuit 12 and the second discharge lamp.
- the lighting circuit 13 controls the switching transistors 122 and 132 of the lighting circuit 13 to control the output power, the current lb supplied from the DC power supply 11 is controlled.
- the power supply current value flowing out from this single DC power source 11 is The corresponding current value can be accurately detected, and the current lb supplied from the DC power supply 11 can be appropriately controlled based on the detection result.
- the control unit 17 causes the first discharge lamp lighting circuit 12 and the second discharge lamp lighting circuit 13 to be set. Since the output power of each DC power supply circuit is limited and the overcurrent is limited to the current supplied from the DC power supply 11, the DC power supply 11, the first discharge lamp lighting circuit 12, and the second discharge lamp are configured. The load circuit such as the lamp lighting circuit 13 can be protected from overcurrent.
- the detection circuit using the first load current detection resistor 14 and the detection circuit using the second load current detection resistor 15 are independent of each other, each of them is an accurate current without interfering with each other. Can be detected.
- the total current detection unit 16 has the same configuration as the total current detection unit 7A (Embodiment 1) or the total current detection unit 7B (Embodiment 2). From the DC power supply 11, a plurality of loads such as the first discharge lamp lighting circuit 12 and the second discharge lamp lighting circuit 13 can be obtained while enjoying the effects of the total current detection unit 7A or the total current detection unit 7B. It is possible to accurately detect the current value corresponding to the power supply current flowing into the circuit.
- the integration circuit voltage setting means of the fifth embodiment (FIG. 7) is added to the integration circuit of the total current detection unit 7B, it is possible to perform the overcurrent limitation with the quick response described above. wear.
- the discharge lamp lighting device is supplied from one DC power source. It is suitable for accurately detecting the power supply current and controlling the current supplied from the DC power supply based on the detection result.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
- Inverter Devices (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE112005000049T DE112005000049B4 (de) | 2004-07-28 | 2005-05-25 | Entladungslampen-Vorschaltgerätevorrichtung |
CN2005800008182A CN1843063B (zh) | 2004-07-28 | 2005-05-25 | 放电灯点灯装置 |
US10/568,534 US7298095B2 (en) | 2004-07-28 | 2005-05-25 | Discharge lamp ballast apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-220400 | 2004-07-28 | ||
JP2004220400A JP4476730B2 (ja) | 2004-07-28 | 2004-07-28 | 放電灯点灯装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006011288A1 true WO2006011288A1 (ja) | 2006-02-02 |
Family
ID=35786043
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/009555 WO2006011288A1 (ja) | 2004-07-28 | 2005-05-25 | 放電灯点灯装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US7298095B2 (ja) |
JP (1) | JP4476730B2 (ja) |
CN (1) | CN1843063B (ja) |
DE (1) | DE112005000049B4 (ja) |
WO (1) | WO2006011288A1 (ja) |
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TWM265641U (en) * | 2004-06-09 | 2005-05-21 | Rilite Corportation | Double shielded electroluminescent panel |
US7372216B2 (en) * | 2006-04-03 | 2008-05-13 | Ceelite Llc | Constant brightness control for electro-luminescent lamp |
AT504944B1 (de) * | 2007-02-16 | 2012-03-15 | Siemens Ag | Wechselrichter |
JP2008235240A (ja) * | 2007-02-23 | 2008-10-02 | Sansha Electric Mfg Co Ltd | 放電ランプ点灯制御方法、コンピュータプログラム、放電ランプ点灯制御装置、及び電源回路 |
US7898185B2 (en) * | 2007-07-05 | 2011-03-01 | Mojarradi Mohammad M | Current controlled driver |
US8502454B2 (en) | 2008-02-08 | 2013-08-06 | Innosys, Inc | Solid state semiconductor LED replacement for fluorescent lamps |
US7977887B2 (en) * | 2008-09-09 | 2011-07-12 | Delphi Technologies, Inc. | Low leakage current LED drive apparatus with fault protection and diagnostics |
DE102008055862A1 (de) | 2008-11-05 | 2010-05-06 | Tridonicatco Gmbh & Co. Kg | Leuchtmittel-Betriebsgerät mit Potentialtrennung |
US8148907B2 (en) * | 2009-04-11 | 2012-04-03 | Sadwick Laurence P | Dimmable power supply |
TWI495393B (zh) * | 2009-05-09 | 2015-08-01 | Innosys Inc | 通用型調光器 |
JP5379560B2 (ja) * | 2009-05-26 | 2013-12-25 | パナソニック株式会社 | 点灯装置ならびにそれを用いた照明器具および照明システム |
US8536803B2 (en) * | 2009-07-16 | 2013-09-17 | Innosys, Inc | Fluorescent lamp power supply |
FR2958408B1 (fr) * | 2010-04-01 | 2012-12-07 | Continental Automotive France | Dispositif et procede de mesure de courant pour controler au moins deux equipements electriques montes en cascade |
US8773031B2 (en) | 2010-11-22 | 2014-07-08 | Innosys, Inc. | Dimmable timer-based LED power supply |
TWI458261B (zh) * | 2011-12-27 | 2014-10-21 | Acbel Polytech Inc | Digital controller with level conversion function and its level conversion circuit |
US8987997B2 (en) | 2012-02-17 | 2015-03-24 | Innosys, Inc. | Dimming driver with stealer switch |
DE102012104752B3 (de) * | 2012-06-01 | 2013-11-28 | Sma Solar Technology Ag | Verfahren zur Messung eines Isolationswiderstands für einen Wechselrichter und Wechselrichter |
WO2014011706A1 (en) * | 2012-07-09 | 2014-01-16 | Inertech Ip Llc | Transformerless multi-level medium-voltage uninterruptible power supply (ups) systems and methods |
JP6232133B2 (ja) * | 2014-06-10 | 2017-11-15 | 日立オートモティブシステムズ株式会社 | 電子制御装置 |
CN106124840B (zh) * | 2016-06-27 | 2019-01-15 | 成都芯源系统有限公司 | 电流检测电路 |
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-
2005
- 2005-05-25 DE DE112005000049T patent/DE112005000049B4/de not_active Expired - Fee Related
- 2005-05-25 WO PCT/JP2005/009555 patent/WO2006011288A1/ja not_active Application Discontinuation
- 2005-05-25 CN CN2005800008182A patent/CN1843063B/zh not_active Expired - Fee Related
- 2005-05-25 US US10/568,534 patent/US7298095B2/en not_active Expired - Fee Related
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JPH0845675A (ja) * | 1994-08-03 | 1996-02-16 | Hitachi Ltd | 放電灯点灯装置 |
JP2001043986A (ja) * | 1999-07-30 | 2001-02-16 | Denso Corp | 放電灯装置 |
Also Published As
Publication number | Publication date |
---|---|
US20060261748A1 (en) | 2006-11-23 |
DE112005000049T5 (de) | 2006-07-20 |
CN1843063B (zh) | 2010-12-29 |
CN1843063A (zh) | 2006-10-04 |
JP4476730B2 (ja) | 2010-06-09 |
US7298095B2 (en) | 2007-11-20 |
DE112005000049B4 (de) | 2013-04-25 |
JP2006040757A (ja) | 2006-02-09 |
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