JP2006185876A - Power sourve device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power source device capable of improving an allowance of the treatment of its control device against it. <P>SOLUTION: A flag indicating whether a high-brightness discharge lamp 8 is in a state of rated power or not is stored in a control circuit 51. A PWM drive to an N-channel FET 12 in a chopper circuit 1 is controlled by utilizing the value of a flag. When determining whether the high-brightness discharge lamp 8 is in a state of rated power or not, it can be determined by the flag alone. Further, a set value of a duty ratio of a control pulse PLS2 in a state of rated power is stored, and it can quickly get back to the state of rated power by utilizing the set value at the state of rated power. By the above, the allowance of the treatment of the control circuit 51 against the power source device is improved, and the freedom for designing the device is also improved. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power supply device having a constant power control function for a discharge lamp.

  In recent years, a discharge lamp called a HID (High Intensity Discharge) lamp, which emits light by discharge in metal vapor, has begun to be widely used. Examples of the high-intensity discharge lamp include a metal halide lamp, a high-pressure sodium lamp, a mercury lamp, and the like, and a large luminous flux can be obtained with high efficiency, so that it is widely used in public facilities and industrial facilities.

In order to turn on this high-intensity discharge lamp, it is necessary to roughly divide the following three stages.
(1) A discharge path is generated between the lamp electrodes. (2) While maintaining / increasing the current in the discharge path, control is performed along the time-varying lamp voltage so as to shift to stable discharge. (3) Stable When discharged, perform constant power control on lamp power

  Here, it is a starter called an igniter (high voltage pulse generator) that plays the role of the above stage (1), and the control of the above stage (2) and stage (3) controls the ballast. It is called a ballast (power supply device). Among them, the ballast mainly includes a switching circuit such as a chopper circuit and a PWM controller that performs PWM (Pulse Width Modulation) control on the switching elements of the switching circuit.

  One of the constant power control methods in such a ballast is a method using a control device such as a microcomputer. In this control, power conversion based on the detected lamp voltage and lamp current is performed by a control circuit in the control device, and control is performed so as to obtain constant power. Specifically, the digital control signal output from this control circuit is converted into an analog signal and superimposed on the PWM controller. The signal is compared with the output pulse of the triangular wave oscillation circuit in the PWM controller by a comparator in the PWM controller, and pulse control is performed so that the duty ratio of the switching element in the switching power supply circuit becomes constant power. It has become. When the control circuit is used in this way, there is an advantage that the configuration of the entire ballast is simplified.

  For example, in Patent Document 1, constant power control is performed by comparing a power value calculated by a digital multiplier based on a detected lamp voltage and lamp current with data recorded in a data table. Thus, a technique for PWM-controlling the operation of the switching element is disclosed.

Japanese Patent Laid-Open No. 11-144887

  By the way, in the constant power control method by the control device as described above, for example, when it is determined that the power supply system of the high-intensity discharge lamp is in an overpower state, the number of times the control circuit in the control device determines so is counted. It is conceivable to configure so as to count at If the number of times does not reach a predetermined specified value, control is performed so that the current power value is smaller than the current value. Then, the system is determined to be in an overpower state and the system is reset. In other words, until the power supply system of the high-intensity discharge lamp returns to the target power state (rated power state), the duty ratio of the control pulse to the switching element is reduced by PWM control so that the power value is reduced at a constant rate. It is possible.

  However, when PWM control is performed at a constant rate until it returns to the rated power state in this way, it takes time to return to the original rated power state, and how long it takes to return is predicted. I can't do it. Therefore, since the control device cannot perform a quick process, the time during which stress is applied to the elements of the power supply system in an overpower state is lengthened, and the probability of damaging these elements increases.

  Further, as described above, since the control device performs the determination process for checking whether or not the power supply system is in the overpower state one by one, the process becomes very complicated.

  As described above, in the conventional technique that cannot perform a quick process, the margin of processing for the power supply device of the control device is reduced, and the degree of freedom in designing the device is reduced.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a power supply device capable of improving a processing margin for the power supply device.

  The first power supply apparatus of the present invention stores storage means for storing an identifier indicating whether or not the discharge lamp is in a rated power state in which constant power is lit at a predetermined range of power, and is stored by the storage means. And a switching element driving circuit for controlling the driving of the switching element using the identifier.

  Here, the “rated power state” means, for example, a state in which the discharge lamp maintains constant power near a predetermined target power value.

  In the first power supply device of the present invention, an identifier indicating whether or not the power is in the rated power state is stored, and the switching of the switching element is controlled using the stored identifier.

  In the first power supply device of the present invention, based on the identifier stored in the storage unit, a determination unit that determines whether or not the rated power state is set, and the determination unit determines that the rated power state is not set. And a control means for generating a control signal for setting the rated power state, and the switching element drive circuit is configured to control the driving of the switching element based on the control signal generated by the control means. Is possible. In this case, it is preferable that the control unit is configured to perform control so as to shift to the next cycle when the determination unit determines that the power is in the rated power state.

  The second power supply device of the present invention includes a switching element driving circuit that controls driving of the switching element, and a control content for driving the switching element in a rated power state in which the discharge lamp is lit at a constant power with a predetermined range of power. Storage means for storing, and the switching element driving circuit controls the driving of the switching element using the control contents in the rated power state stored by the storage means.

  In the second power supply device of the present invention, the control content for driving the switching element in the rated power state is stored, and the control for driving the switching element is performed using the stored control content in the rated power state. .

  In the second power supply device of the present invention, the judging means for judging whether or not the power is in the rated power state, and the rated power state stored in the storage means when the judging means judges that the power is not in the rated power state. And a control means for generating a control signal for setting the rated power state based on the control content of the switching element, wherein the switching element drive circuit drives the switching element based on the control signal generated by the control means. It can be configured to control.

  In the second power supply device of the present invention, when the determination means determines that the power supply state is not in the rated power state, the control content for driving the switching element at that time and the control content in the rated power state stored in the storage means And when the control means determines that the respective control contents do not match each other, based on the stored control contents in the rated power state. It is preferable that the control signal is generated by resetting.

  In the second power supply device of the present invention, when the determining means determines that the rated power state is not established, the power value in the rated power state is determined based on the control content in the rated power state stored by the storage means. The degree of deviation of the power value is determined, and the control means performs stepwise control according to the degree of deviation of the power value based on the determination result of the degree of deviation of the power value by the judging means. It is preferable to configure.

  In the second power supply device of the present invention, whether or not the control content in the rated power state stored by the storage unit is within a predetermined range when the determining unit determines that the rated power state is not present. When the control means determines that the control content in the rated power state stored in the storage means is not within the predetermined range, the apparatus is preferably configured to stop.

  According to the first power supply device of the present invention, an identifier indicating whether or not the rated power state is present is stored, and the control for driving the switching element is performed using the stored identifier. Therefore, it is not necessary to perform calculation processing and the like one by one when determining whether or not the power is rated power, it is possible to determine only by the contents of the identifier, and it is possible to improve the processing margin for the power supply device. . Therefore, it is possible to improve the degree of freedom when designing the apparatus.

  In particular, when it is determined to be in the rated power state and control is performed to shift to the next cycle, the processing is simplified by omitting unnecessary processing, and the margin of processing for the power supply device Can be further improved.

  Further, according to the second power supply device of the present invention, the control content for driving the switching element in the rated power state is stored, and the switching content is driven using the stored control content in the rated power state. Therefore, it is possible to quickly return to the rated power state by using the stored control content. Therefore, it is possible to improve the margin of processing for the power supply apparatus, and it is also possible to improve the degree of freedom when designing the apparatus.

  In particular, when it is determined that it is not in the rated power state, the degree of deviation of the power value is judged based on the stored control content, and stepwise control is performed according to the degree of deviation of the power value. In this case, it is possible to return to the rated power state more quickly by performing an appropriate process according to the degree of the deviation, and it is possible to further improve the processing margin for the power supply device.

  In particular, when it is determined that it is not in the rated power state, it is determined whether the stored control content is within a predetermined range, and when it is determined that this is not within the predetermined range, the device If the control content deviates from the range that can be taken from the configuration, it can be determined that it is a malfunction of the device itself, and a quick response can be made. The degree can be further improved.

  Hereinafter, the best mode for carrying out the present invention (hereinafter simply referred to as an embodiment) will be described in detail with reference to the drawings.

[First Embodiment]
FIG. 1 shows a configuration of a power supply device according to the first embodiment of the present invention. This power supply device performs control via an igniter 7 that generates a high voltage and operates as a starter so that the high-intensity discharge lamp 8 that is a load lights at a constant power. This power supply apparatus includes a chopper circuit 1 that steps down a high-voltage DC input voltage Vin supplied from a high-voltage power supply (not shown) to obtain a low-voltage DC output voltage V1, and four full-bridge switching elements. The inverter circuit 2, the current detection circuit 3, the voltage detection circuit 4, the control circuit 51 for controlling the constant power operation for the high-intensity discharge lamp 8, and the digital / analog conversion for the control signal L 5 from the control circuit 51 ( A D / A converter 52 that performs D / A conversion) and a PWM controller 6 that generates a drive pulse PLS2 for driving the chopper circuit 1 are provided. The high-voltage power source may be a high-voltage battery, or a combination of an AC generator and a rectifier circuit, or a combination thereof.

The chopper circuit 1 includes a power line LH and a ground that connect a pair of input terminals T1 and T2 to which a DC input voltage Vin is applied and a pair of chopper circuit output terminals T3 and T4 to which a DC output voltage V1 is output, respectively. Line LG, an input smoothing capacitor 11 connected between the input terminals T1 and T2, and an N-channel FET inserted in the power line LH on the output side of the input smoothing capacitor 11 (the side opposite to the input terminals T1 and T2) (Field Effect Transistor) 12 is provided. The N-channel FET 12 is arranged such that its drain D is connected to the input terminal T1 side and its source S is connected to the chopper circuit output terminal T3 side. The gate G of the N-channel FET 12 is connected to an output terminal VO of a drive circuit 64 in the PWM controller 6 described later. The input smoothing capacitor 11 is for smoothing the input DC input voltage Vin, and the N-channel FET 12 functions as a switching element that generates a substantially rectangular pulse voltage by intermittently connecting the DC input voltage Vin. Is. The arrangement of the N-channel FET 12 is not limited to this, and it may be inserted between the ground line LG and the anode of the rectifier diode 13 described below. Also, the drain voltage V _D , source voltage V _S and gate voltage V _G in the figure represent the potentials of the drain D, source S and gate G of the N-channel FET 12 with respect to the ground line LG, respectively.

  The chopper circuit 1 also includes a rectifier diode 13 having a cathode connected to the power line LH on the source side of the N-channel FET 12 and an anode connected to the ground line LG, and a chopper circuit output terminal T3 side from the cathode of the rectifier diode 13. Connected to the choke coil 14 inserted in the power line LH and between the power line LH on the output side of the choke coil 14 and the ground line LG (that is, between the chopper circuit output terminals T3 and T4). And an output smoothing capacitor 15. The rectifier diode 13 rectifies the pulse voltage generated by the N-channel FET 12, and the choke coil 14 and the output smoothing capacitor 15 are for smoothing the rectified voltage waveform. The inverter circuit 2 is connected to the chopper circuit output terminals T3 and T4. With such a configuration, the chopper circuit 1 performs a chopping operation with an operation cycle of about several tens to several hundreds of kHz in accordance with the drive pulse PLS2 output from the PWM controller 6, and supplies the DC output voltage V1 to the inverter circuit 2. It is supposed to be.

  The inverter circuit 2 includes four switching elements S1 to S4 that are bridge-connected to each other. Specifically, one ends of the switching elements S1 and S2 are connected to each other to form a connection point P4, and one ends of the switching elements S3 and S4 are connected to each other to form a connection point P5. The other ends of the switching elements S1 and S3 are connected to each other to form a connection point P2, and the other ends of the switching elements S2 and S4 are connected to each other to form a connection point P3. P3 is connected to chopper circuit output terminals T3 and T4, respectively. Further, these switching elements S1 to S4 are controlled by the control signals L1 to L4 from the control circuit 51, respectively, while the switching elements S1 and S4 are on and the switching elements S2 and S3 are off, and the switching elements S2 and S3 are In the on state, the switching elements S1 and S4 are alternately switched to the off period. With this configuration, the inverter circuit 2 converts the DC output voltage V1 from the chopper circuit 1 applied between the chopper circuit output terminals T3 and T4 into the AC output voltage V2 by the above switching operation with an operation cycle of about several hundred Hz. The AC output voltage V2 is supplied to the high-intensity discharge lamp 8 via the inverter output terminals T5 and T6 and the igniter 7. Each of the switching elements S1 to S4 is configured by a switching element such as an FET, a bipolar transistor, or an IGBT (Insulated Gate Bipolor Transistor).

  The current detection circuit 3 is inserted into the ground line LG between the chopper circuit output terminal T4 and the connection point P3. With this configuration, the current detection circuit 3 detects the DC output current I1 of the chopper circuit 1 as a lamp current of the high-intensity discharge lamp 8, and converts it into a voltage. The magnitude of the lamp current I1 is as follows. A corresponding lamp current signal LI is output to the current input terminal VI of the control circuit 51. The arrangement of the current detection circuit 3 is not limited to this, and the current detection circuit 3 may be inserted into the power supply line LH between the chopper circuit output terminal T3 and the connection point P2.

  The voltage detection circuit 4 is disposed between the connection point P2 and the voltage input terminal VV of the control circuit 51. With such a configuration, the voltage detection circuit 4 detects the DC output voltage V1 of the chopper circuit 1 as the lamp voltage of the high-intensity discharge lamp 8, and generates a lamp voltage signal LV corresponding to the magnitude of the lamp voltage V1. 51 is output to the voltage input terminal VV. As a specific circuit configuration of the voltage detection circuit 4, for example, a DC output voltage V1 is detected by a voltage dividing resistor (not shown) disposed between the connection point P2 and the ground, and a signal corresponding thereto is detected. The thing which produces LV is mentioned.

  The control circuit 51 includes a current input terminal VI, a voltage input terminal VV, four switching element control terminals VS1 to VS4, and n (n: a natural number of 1 or more) output terminals VO1 to VOn. . The current input terminal VI is connected to the current detection circuit 3 via the lamp current signal LI, the voltage input terminal VV is connected to the voltage detection circuit 4 via the ramp voltage signal LV, and the switching control terminals VS1 to VS4 are respectively controlled. The output terminals VO1 to VOn are connected to the input terminal of the D / A converter 52 via the n-bit control signal L5 via the signals L1 to L4. Yes. The control circuit 51 controls the constant power operation for the high-intensity discharge lamp 8 as described above. Specifically, the calculation is performed based on the lamp current signal LI corresponding to the lamp current I1 detected by the current detection circuit 3 and the lamp voltage signal LV corresponding to the lamp voltage V1 detected by the voltage detection circuit 4. A digital (n-bit) control signal L5 for lighting the high-intensity discharge lamp 8 at a constant power is generated, and these control signals are output to the PWM controller 6 via the D / A converter 52. It has become. The control circuit 51 also generates control signals L1 to L4 for controlling the switching operations of the switching elements S1 to S4 and supplies them to these switching elements. The control circuit 51 is constituted by, for example, a microcomputer. In this case, the constant power operation is controlled by software, and periodic control as described later is performed.

  The input terminal of the D / A converter 52 is connected to the output terminals VO1 to VOn of the control circuit 51 via an n-bit control signal L5, and the output terminal is connected to the PWM controller via a control signal L12 as will be described later. 6 is connected to the inverting input terminal of the comparator 63B. The D / A converter 52 performs D / A conversion on the digital control signal L5 from the control circuit 51 as described above to generate an analog control signal L12. For example, a plurality of resistors Are constituted by a so-called R-2R ladder or the like connected alternately.

  Here, in this power supply device, the operation mode of the PWM controller 6 utilizing the soft start function is determined by the n-bit control signal L5 output from the control circuit 51, and the PWM controller 6 uses the power of the high-intensity discharge lamp 6 to power. The operation according to the state is made. FIG. 2 shows the operation mode of the PWM controller 6 using this soft start function, the n-bit control signal L5 output from the control circuit 51, and the voltage V12 of the control signal L12 output from the D / A converter 52. Represents an example of the relationship. In this figure, the horizontal axis indicates the operation mode of the PWM controller 6, the right vertical axis indicates the value of the 8-bit control signal L5 in hexadecimal and decimal numbers (value in parentheses), and the left vertical axis. Represents the voltage V12 of the control signal L12 corresponding to the value of the control signal L5. In this example, the control signal L5 is assumed to be 8 bits, and the voltage V12 of the control signal L12 is assumed to be in a voltage range from 0 to 4.00V. In addition, the range indicated by reference signs X1 and Y1 in the figure represents the control range of the control circuit 51.

  Thus, in this example, the operation mode of the PWM controller 6 is the control signal L5 = “00H (0)” to “50H (80)”, that is, the stop corresponding to the interval from the voltage V12 = 0V to 0.80V. The mode A, the control signal L5 = “64H (100)” to “C0H (192)”, that is, the constant power control mode corresponding to the voltage V12 = 1.00V to 1.92V, and the control signal L5 = “ C0H (192) "to" FFH (255) ", that is, the stop mode B corresponding to the section of voltage V12 = 1.92V to 2.55V. Note that the control signal L5 = “50H (80)” to “64H (100)”, which is located between the stop mode A and the constant power control mode, that is, the voltage V12 = 0.80V to 1.00V, The PWM controller 6 is in standby mode

  The stop mode A is an operation mode in which the supply of the control pulse PLS2 from the PWM controller 6 to the chopper circuit 1 is stopped, as will be described later. At this time, since the N-channel FET 12 in the chopper circuit 1 is turned off, the operation of the power supply device is stopped. This stop mode A is set when an abnormality occurs in the system, for example, when the high-intensity discharge lamp 8 is in an overpower state in which the power is larger than a predetermined power value.

  The constant power control mode is an operation mode that is set when constant power control is performed on the high-intensity discharge lamp 8. In this constant power control mode, as the value of the control signal L5 increases from “64H (100)” to “C0H (192)”, the duty ratio of the control pulse PLS2 also increases (for example, 0% to 46). %) In the PWM controller 6. With such a configuration, the duty ratio of the control pulse PLS2 supplied to the chopper circuit 1 is set to an arbitrary value by a control signal L5 from the control circuit 51, as will be described later. The voltage V12 of the control signal L12 is set so as to be within the amplitude voltage range of the oscillation pulse PLS1 output from the oscillation circuit 62 in the PWM controller 6 as will be described later. As long as the mode is selected, the duty ratio of the control pulse PLS2 is not fixed to 0% in the normal state.

  The stop mode B is an operation mode in which the duty ratio of the control pulse PLS2 is maximized and the operation of the power supply device is stopped. This stop mode B is set, for example, when this power supply device is in a latch-up state.

  Returning to FIG. 1, the PWM controller 6 includes an amplifier 61 that amplifies the potential difference between the reference voltage V3 and the connection point P6, an oscillation circuit 62 that generates an oscillation pulse PLS1 composed of a triangular wave having a predetermined period, and a comparator 63A. , 63B, and a drive circuit 64 that generates a drive pulse PLS2 for actually driving the chopper circuit 1 based on the comparison result signals L21, L22 output from the comparators 63A, 63B, respectively. Have.

  The non-inverting input terminal of the amplifier 61 is connected to a reference voltage power supply 611 arranged outside the PWM controller 6, the inverting input terminal is connected to the connection point P6, and the output terminal is connected to the inverting input terminal of the comparator 63A. Yes. The reference voltage V3 is supplied from the reference voltage power supply 611, and the constant voltage V4 supplied from the constant voltage power supply 612 is divided at the connection point P6 by the voltage dividing resistors 613 and 614 arranged outside the PWM controller 6. Voltage is supplied. With such a configuration, the amplifier 61 amplifies (stabilizes) the potential difference between the reference voltage V3 and the connection point P6, and outputs a fixed amplification signal L11 composed of the fixed potential V11 to the comparator 63A. In this power supply device, since the amplifier 61 does not control the duty ratio of the drive pulse PLS2, the fixed potential V11 of the fixed amplification signal L11 is output from the oscillation circuit 62 so that the duty ratio becomes maximum. It is set to be always higher than the potential of the oscillation pulse PLS1.

  The output terminal of the oscillation circuit 62 is connected to the non-inverting input terminals of the comparators 63A and 63B. The inverting input terminal of the comparator 63A is connected to the output terminal of the amplifier 61 via the fixed amplification signal L11, and the output terminal of the comparator 63A is connected to the input terminal VC1 of the drive circuit 64 via the comparison result signal L21. ing. The inverting input terminal of the comparator 63B is connected to the output terminal of the D / A converter 52 via the control signal L12, and the output terminal of the comparator 63B is connected to the input terminal VC2 of the drive circuit 64 via the comparison result signal L22. It is connected to the. With this configuration, the comparator 63A compares the fixed potential V11 of the fixed amplification signal L11 output from the amplifier 61 with the potential of the oscillation pulse PLS1, and drives the comparison result signal L21 having a fixed potential, as will be described later. The output is made to the circuit 64. On the other hand, as described later, the comparator 63B compares the potential V12 of the control signal L12 output from the D / A converter 52 with the potential of the oscillation pulse PLS1, and the comparison result consisting of a variable potential. The signal L22 is output to the drive circuit 64.

  The drive circuit 64 has input terminals VC1 and VC2 and an output terminal VO. The input terminals VC1 and VC2 are connected to the output terminals of the comparators 63A and 63B via the comparison result signals L21 and L22, respectively, and the output terminal VO is connected to the gate G of the N-channel FET 12. The drive circuit 64 generates a drive pulse PLS2 supplied from the output terminal VO to the gate G of the N-channel FET 12 based on the comparison result signals L21 and L22 output from the comparators 63A and 63B, respectively. With this configuration, the drive circuit 64 drives the N-channel FET 12 by PWM control using the drive pulse PLS2. In the example of FIG. 1, the drive pulse PLS2 output from the drive circuit 64 is directly supplied to the N-channel FET 12. However, for example, the drive pulse PLS2 may be supplied to the N-channel FET 12 via a certain amplifier. Good.

  The igniter 7 functions as a starter that generates a discharge path between lamp electrodes (not shown) of the high-intensity lamp 8 when the high-intensity lamp 8 is lit. It is inserted between them. The high-intensity discharge lamp 8 is a discharge lamp that emits light by discharge in metal vapor, and examples thereof include a metal halide lamp, a high-pressure sodium lamp, and a mercury lamp. The high-intensity discharge lamp 8 is subjected to constant power control by an AC output current supplied from the inverter circuit 2 after a discharge path is generated by the igniter 7 and transition to stable discharge.

  Here, the chopper circuit 1 corresponds to a specific example of “switching power supply circuit” in the present invention, and the N-channel FET 12 is a specific example of “switching element” in the present invention. The “high-intensity discharge lamp 8” is a specific example of the “discharge lamp” in the present invention. The control circuit 51 is a specific example of “storage means”, “determination means”, and “control means” in the present invention, and the control signal L12 is a specific example of “control signal” in the present invention. The PWM controller 6 is a specific example of the “switching element driving circuit” in the present invention.

Next, the operation of the power supply apparatus having the above configuration will be described with reference to FIG. Here, FIG. 3 shows the voltage waveform of each part of the power supply device shown in FIG. 1, (A) shows the lamp power P (= lamp voltage V1 × lamp current I1) in the high-intensity discharge lamp 8, (B) shows the potential V11 of the fixed amplification signal L11, (C) shows the waveform of the oscillation pulse PLS1, (D) shows the potential V12 of the control signal L12, and (E) is seen from the source potential V _S. The waveform of the drive pulse PLS2 in this case is shown, and (F) shows the DC output voltage of the chopper circuit 1, that is, the lamp voltage V1. In the example shown here, the predetermined target power value (rated power value) in the power P is Pt, the peak value of the potential V11 = 3.50V, the peak value of the oscillation pulse PLS1 = 1.00V, the wave of the oscillation pulse PLS1. High value = 3.00V, Crest value of potential V12 = 0.00V, Crest value of potential V12 = 1.00 to 1.92V, Crest value of drive pulse PLS2 = 0.00V, Crest value of drive pulse PLS2 = A predetermined target voltage value (rated voltage value) at 5.00 V and the lamp voltage V1 is Vt. In the following, the rated power control operation at the time of stable discharge of the high-intensity discharge lamp 8, which is a characteristic part of the present invention, will be described, and the description of the control operation before shifting to stable discharge will be omitted.

  First, the power P of the high-intensity discharge lamp 8 is larger than a predetermined target power value (rated power value) Pt, and the operation when the power P is reduced by this power supply device (timing t1 to t5 in FIG. 3). (Period).

  First, the lamp current I1 and the lamp voltage V1 of the high-intensity discharge lamp 8 are detected by the current detection circuit 3 and the voltage detection circuit 4, respectively. Based on these detected values, the lamp power P is calculated by the control circuit 51. Calculated. For example, at timing t1, the lamp voltage V1 is larger than the rated voltage value Vt (FIG. 3F), and accordingly, the lamp power P is also larger than the rated power value Pt (FIG. 3A). )), That is, when the control circuit 51 determines that the high-intensity discharge lamp 8 is in an overpower state at timing t1, the control circuit 51 causes the duty ratio of the control pulse PLS2 to the chopper circuit 1 to be reduced. The control signal L5 of n bits (8 bits in this example) as shown in FIG. 2 is generated, the signal is analog-converted by the D / A converter 52, and the analogized control signal L12 is compared. To the non-inverting input terminal of the device 63B.

  The comparator 63B compares the supplied potential V12 of the control signal L12 with the potential of the oscillation pulse PLS1. Here, when the potential of the oscillation pulse PLS1 is smaller than the potential V12, the comparison result signal L22, which is an output signal thereof, becomes “H” level, and conversely, the potential of the oscillation pulse PLS1 is larger than the potential V12. In addition, the comparison result signal L22 is set to the “L” level (= 0V). That is, in the power supply device of the present embodiment, since the potential V12 of the control signal L12 is set to be within the amplitude voltage range of the oscillation pulse PLS1 as described above (FIG. 3D), high luminance is achieved. Unless the operation mode of the discharge lamp 8 is the stop mode A or the stop mode B, the duty ratio of the comparison result signal L22 is not fixed at 0% in the normal state, and a variable signal corresponding to the voltage change of the potential V12. It becomes.

  On the other hand, the comparator 63A compares the potential V11 of the fixed amplification signal L11 output from the amplifier 61 with the potential of the oscillation pulse PLS1. Here, as described above, since the potential V11 is a fixed potential and is always higher than the potential of the oscillation pulse PLS1 (FIG. 3B), the comparison result signal L21, which is the output signal of the comparator 63A, is also obtained. The fixed signal is always at “H” level, which is higher than the potential of the oscillation pulse PLS1.

  Thus, while the comparison result signal L22 is a variable signal according to the voltage change of the potential V12, the comparison result signal L21 is a fixed signal of “H” level (= 3.50 V) that is always larger than the potential of the oscillation pulse PLS1. Therefore, in the drive circuit 64, the control pulse PLS2 that changes so that its duty ratio decreases as the potential V12 of the comparison result signal L22 decreases (timing t1 to t5 in FIG. 3D). It is generated (FIG. 3E) and supplied to the chopper circuit 1.

In the chopper circuit 1, the DC input voltage Vin supplied from the input terminals T 1 and T 2 is smoothed by the input smoothing capacitor 11. The smoothed drain voltage V _D becomes a square wave when the N-channel FET 12 is turned on / off, and the waveform is smoothed by the choke coil 14 and the output smoothing capacitor 15. The DC output voltage of the chopper circuit 1, that is, the lamp voltage V1, is determined by the pulse width of the gate voltage V _G and the drain voltage V _D , and the output current I1 corresponding to the power state of the high-intensity discharge lamp 8 as a load is , Supplied to the inverter circuit 2.

  In the inverter circuit 2, the switching elements S 1 and S 4 are in the on state and the switching elements S 2 and S 3 are in the off state, and the switching elements S 2 and S 3 are in the on state in response to the switching element control signals L 1 to L 4 from the control circuit 51. Thus, the switching elements S1 and S4 are alternately switched to the off-state period, whereby the AC output voltage V2 is generated based on the DC output voltage V1 (lamp voltage) supplied from the chopper circuit 1. The AC output voltage V2 is supplied to the high-intensity discharge lamp 8 via inverter output terminals T5 and T6. In the high-intensity discharge lamp 8, as the duty ratio of the control pulse PLS2 decreases, the lamp voltage V1 and the lamp power P also decrease to the rated values Vt and Pt, respectively (FIG. 3F). , (A)). In this way, the rated power control is performed by the power supply device so that the high-intensity discharge lamp 8 changes from the overpower state to the rated power value Pt.

  Next, the operation when the power P of the high-intensity discharge lamp 8 is smaller than the rated power value Pt and the power P is increased by the power supply apparatus (period t6 to t10 in FIG. 3) will be described. .

  In this case as well, as described above, the rated voltage is controlled so that the high-intensity discharge lamp 8 reaches the rated power value Pt from the overpower state. It is smaller than the voltage value Vt (FIG. 3F), and accordingly, the lamp power P is also smaller than the rated power value Pt (FIG. 3A), that is, the high-intensity discharge lamp at timing t6. When it is determined that 8 is in a low power state, the control circuit 51 generates an n-bit control signal L5 so that the duty ratio of the control pulse PLS2 is increased, and the analog control signal L12 is compared. To the inverting input terminal of the device 63B. Then, the drive signal 64 changes via the comparators 63A and 63B so that the duty ratio increases as the potential V12 of the comparison result signal L22 increases (timing t6 to t10 in FIG. 3D). The control pulse PLS2 to be generated is generated (FIG. 3E) and supplied to the chopper circuit 1. In the high-intensity discharge lamp 8, as the duty ratio of the control pulse PLS2 increases, the lamp voltage V1 and the lamp power P also increase to the rated values Vt and Pt, respectively (FIG. 3F). , (A)). In this way, the rated power control is performed by the power supply device so that the high-intensity discharge lamp 8 changes from the low power state to the rated power value Pt.

  Next, a periodic processing operation performed by the control circuit 51 in the above rated power control will be described with reference to FIGS. Here, FIG. 4 shows a periodic rated power control process in the power supply apparatus of FIG. 5 and 6 show specific processes in the rated power control process (step S15) shown in FIG.

  First, since the rated power control processing in this power supply apparatus is performed at a constant cycle as described above, the control circuit 51 monitors and confirms the cycle (step S11 in FIG. 4). Specifically, for example, a certain period is monitored by a timer provided in the control circuit, and after the period elapses, the process proceeds to the next process. Next, the control circuit 51 outputs switching element control signals L1 to L4 to the switching elements S1 to S4 in the inverter circuit 2, respectively, and these switching elements have a predetermined cycle (for example, about several hundred Hz). Control is performed to perform the switching operation (step S12).

  Next, the control circuit 51 detects the lamp current signal LI corresponding to the magnitude of the lamp current I1 detected by the current detection circuit 3, and the lamp voltage corresponding to the magnitude of the lamp voltage V1 detected by the voltage detection circuit 4. Each of the signals VI is subjected to digital / analog conversion (A / D conversion) to generate a digitized signal (step S13). Then, the control circuit 51 calculates the lamp power P based on the digitized lamp current and the signal corresponding to the magnitude of the lamp voltage (step S14).

  Next, the control circuit 51 performs the following rated power control process to turn on the high-intensity discharge lamp 8 at a constant power value Pt (step S15). Here, in the control circuit 51 (for example, a memory area), a flag indicating whether or not the high-intensity discharge lamp 8 is in a rated power state in which constant power lighting is performed at the rated power value Pt, and the rating The set value of the duty ratio of the control pulse PLS2 in the power state is always stored. This flag is a specific example of the “identifier” in the present invention, and the set value of the duty ratio of the control pulse PLS2 in the rated power state is “control content for driving the switching element in the rated power state” in the present invention. Is a specific example.

  First, the control circuit 51 determines whether or not the high-intensity lamp 8 is in the rated power state based on the flag indicating whether or not the high-intensity lamp 8 is in the rated power state as described above. Specifically, in this example, it is determined whether or not the value of this flag is 1 (step S151 in FIG. 5). If the value of the flag is 1 (step S151: Y), the control circuit 51 then determines whether or not the rated power value Pt, which is actually the target value, based on the value of the lamp power P calculated in step S14. Is determined (step S152). When the lamp power P is actually the rated power value Pt (step S152: Y), the control circuit 51 determines that the high-intensity discharge lamp 8 is in the rated power state, and the processing described below. Control is performed so as to shift to the next periodic control without going through. As described above, when it is determined that the high-intensity discharge lamp 8 is in the rated power state, unnecessary processing is omitted and processing is simplified by shifting to the next periodic control. In this example, it is configured to indicate the rated power state when the flag value is 1, but conversely to indicate the rated power state when the flag value is 0. It may be configured.

  On the other hand, if the value of the flag is not 1 (0) (step S151: N), or the value of the flag is 1, the calculated lamp power P is not the rated power value Pt but actually Is not in the rated power state (step S152: N), the control circuit 51 performs control such that the high-intensity discharge lamp 8 is in the rated power state as described below. Specifically, in the former case, it is first determined whether or not the high-intensity discharge lamp 8 is in the overpower state A (step S154). In the latter case, the flag is first cleared (the value is set to 0). ) (Step S153), it is determined whether or not it is in the overpower state A (step S154). In the latter case, the decision is made after clearing the flag. In this case, the flag value is 1 although it is not actually in the rated power state (indicating that it is in the rated power state). Because. In this way, it is determined whether or not the high-intensity discharge lamp 8 is in the rated power state based on the actually calculated lamp power P in addition to the value of the flag, so that step S168 described later is performed. Even after the flag value is set to 1 when the rated power state is reached in FIG. 1, even when the rated power state disappears due to a factor over time, the determination can be made reliably.

  Here, in the rated power control in the present embodiment, when it is determined that the high-intensity discharge lamp 8 is in a state other than the rated power state, the control pulse in the rated power state stored in the control circuit 51 is determined. Based on the set value of the duty ratio of PLS2, the control circuit 51 determines the degree of deviation of the lamp power P with reference to the rated power value Pt, and the stepwise rating is determined according to the degree of deviation of the lamp power P. Power control processing is performed. Specifically, in this example, the power state of the high-intensity discharge lamp 8 includes the overpower state A in which the value of the lamp power P is 115% or more of the rated power value Pt and 110% or more of the rated power value Pt. Moreover, it is roughly divided into an overpower state B that is less than 115% and a state that is less than 110% of the rated power value Pt and is not in the rated power state. Since the stepped rated power control process is performed in accordance with the degree of deviation of the lamp power P in this way, an appropriate process according to the state is performed.

  First, when it is determined that the overpower state A (the value of the lamp power P is 115% or more of the rated power value Pt) (step S154: Y), the control circuit 51 determines whether the error The counter value is incremented by 1 (step S155). Here, the error counter indicates the number of times that the high-intensity discharge lamp 8 is determined to be in the overpower state A. Then, it is determined whether or not the value of the error counter has reached a predetermined specified value (for example, 50) (step S156). If the error counter has reached a predetermined specified value (step S156: Y), control is performed. When the circuit 51 is in an overpower state for a longer time, the circuit 51 determines that the power supply element is stressed and damaged, and stops the system (step S157), thereby completing the entire process. When the value of the error counter does not reach the predetermined specified value (step S156: N), the setting value of the duty ratio of the control pulse PLS2 in the rated power state stored in the control circuit 51 is the software It is determined whether or not it is within a configuration setting range (for example, as described above, the duty ratio of the control pulse PLS2 is within a range of 0% to 46%) (step S158). If it is not within the setting range (step S158: N), the control circuit 51 determines that this setting value is a value that cannot be obtained in the configuration, and that the setting value has been changed for some reason, and stops the system. (Step S157). If it is within the set range (step S158: Y), the control circuit 51 next sets the set value of the duty ratio of the control pulse PLS2 at that time and the control pulse PLS2 in the stored rated power state. It is determined whether or not the set value of the duty ratio matches each other (step S159). That is, it is determined whether or not the set value at that time is actually set to the set value in the rated power state that is the target value.

  When the stored set value is actually set to a value in the rated power state (step S159: Y), the control circuit 51 has a predetermined value corresponding to the case where the overpower state A returns to the rated power state. Rated power control A, which is a control process, is performed (step S161). This is in consideration of a case where the stored set value is actually set to a value in the rated power state due to damage or the like and has become the overpower state A. Specifically, for example, the control circuit 51 sets the above-described n-bit control signal L5 so that the duty ratio of the control pulse PLS2 is −5%. After this, the process proceeds to the next periodic control. In this way, the PWM control for the chopper circuit 1 as described above is performed so that the high-intensity discharge lamp 8 is in the rated power state. On the other hand, when the stored set value is not actually set to the value in the rated power state (step S159: N), the stored set value in the rated power state is reset as the target value (step S159). In step S160, the high-intensity discharge lamp 8 can surely return to the rated power state in the subsequent processing. In this case as well, after this, the process proceeds to the next periodic control.

  If it is determined in step S154 that the overpower state A is not detected (step S154: N), the control circuit 51 once clears the error counter value (sets the value to 0) (FIG. 6 step S162). Next, the control circuit 51 determines whether or not the high-intensity discharge lamp 8 is in the overpower state B (110% or more and less than 115% of the rated power value Pt) (step S163). If it is determined that the overpower state B is present (step S163: Y), the control circuit 51 is a predetermined control process corresponding to a case where the overpower state B returns to the rated power state. Is performed (step S164). Specifically, for example, the control circuit 51 sets the above-described n-bit control signal L5 so that the duty ratio of the control pulse PLS2 is −2%. After this, the process proceeds to the next periodic control. On the other hand, if it is determined that the overpower state B is not set (step S163: N), then the control circuit 51 determines whether or not the high-intensity discharge lamp 8 is in the rated power state (step S165). . When it is determined that it is still not in the rated power state (step S165: N), the high-intensity discharge lamp 8 corresponds to a state that is less than 110% of the rated power value Pt and is not in the rated power state. The rated power control C, which is a predetermined control process corresponding to the case of returning from this state to the rated power state, is performed (step S166). Specifically, for example, the control circuit 51 sets the above-described n-bit control signal L5 so that the duty ratio of the control pulse PLS2 becomes ± 1%. After this, the process proceeds to the next periodic control.

  On the other hand, when the rated power state is determined (step S165: Y), the set value of the duty ratio of the control pulse PLS2 at this time is stored in the control circuit 51 (step S167). In this way, the set value of the duty ratio of the control pulse PLS2 when the rated power state is reached is stored in the control circuit 51. The control circuit 51 sets the flag value to 1 to indicate that the high-intensity lamp 8 is in the rated power state (step S168). In this way, it is easily determined that the high-intensity lamp 8 is in the rated power state. After this, the process proceeds to the next periodic control.

  As described above, in this embodiment, a flag indicating whether or not the high-intensity discharge lamp 8 is in the rated power state is stored in the control circuit 51, and the stored flag value is used. Thus, since the PWM drive for the N-channel FET 12 in the chopper circuit 1 is controlled, it is not necessary to perform arithmetic processing one by one when determining whether or not the high-intensity discharge lamp 8 is in the rated power state. The determination can be made based only on the flag value, and the processing margin for the power supply device of the control circuit 51 can be improved. Therefore, it is possible to improve the degree of freedom when designing the apparatus.

  In addition, when it is determined that it is in the rated power state, the process is shifted to the next periodic control, so that unnecessary processing is simplified to simplify processing and further improve the processing margin for the power supply device. Is possible.

  In addition to the value of the flag, it is determined whether or not the high-intensity discharge lamp 8 is in the rated power state based on the actually calculated lamp power P. In this case, even if the flag value is set to 1 and the rated power state is lost due to damage or the like, the determination can be made reliably.

  Further, the setting value of the duty ratio of the control pulse PLS2 in the rated power state is stored, and the PWM driving for the N-channel FET 12 in the chopper circuit 1 is controlled using the stored setting value. Therefore, it is possible to quickly return to the rated power state by using the stored setting value. Therefore, it is possible to improve the margin of processing for the power supply apparatus, and it is also possible to improve the degree of freedom when designing the apparatus.

  Further, when it is determined that the current is not in the rated power state, the degree of deviation of the value of the lamp power P is determined based on the set value of the duty ratio of the control pulse PLS2 in the stored rated power state, and the lamp power P Since stepwise control is performed according to the degree of deviation of the value, it is possible to return to the rated power state more quickly by performing appropriate processing according to the degree of deviation, and the power supply device It is possible to further improve the margin of processing for the above.

  Also, whether or not the set value of the duty ratio of the control pulse PLS2 at that time and the set value of the duty ratio of the control pulse PLS2 in the stored rated power state match each other, that is, the set value at that time Is determined to be actually set to the set value in the rated power state that is the target value, and if it is determined that the stored set value is not actually set to the value in the rated power state, By resetting the stored setting value in the rated power state as the target value, the high-intensity discharge lamp 8 can surely return to the rated power state in the subsequent processing.

  Further, when it is determined that it is not in the rated power state, it is determined whether or not the set value of the duty ratio of the control pulse PLS2 in the stored rated power state is within the setting range in the software configuration. If it is not within the range, the system is stopped, so when the control content deviates from the range that can be taken in the configuration, it can be determined that it is a malfunction of the device itself and it can respond quickly. Thus, it is possible to further improve the processing margin for the power supply device.

  In the power supply device of the present embodiment, when the set value of the duty ratio of the control pulse PLS2 in this rated power state is stored cumulatively, depending on the state of change of the set value over time, etc. It is also possible to determine the degree of deterioration of the apparatus.

  Further, in the power supply device of the present embodiment, a flag indicating whether or not the high-intensity discharge lamp 8 is in the rated power state and a setting value of the duty ratio of the control pulse PLS2 in the rated power state are stored. Although the PWM control is performed using the set values, only one of these flags and the set values in the rated power state may be stored. Even in the case of such a configuration, it is possible to perform a quick process and improve the margin as compared with the conventional case.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.

  FIG. 7 shows a configuration of the power supply device according to the present embodiment. In this figure, the same components as those in the first embodiment (FIG. 1) are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  The power supply apparatus according to the present embodiment is the same as the power supply apparatus according to the first embodiment, except that the control signal output from the D / A converter 52 is used as a reference in the amplifier 61 instead of the inverting input terminal of the comparator 63B. The voltage power supply 611 is connected to a non-inverting input terminal provided with an adder 615. Specifically, the control signal L13 output from the D / A converter 52 is connected to the non-inverting input terminal of the amplifier 61 via the adder 615 as described above, and the potential of the control signal L13 is used as the correction potential. The signal line L12 that is superimposed on the reference potential V3 and connected to the inverting input terminal of the comparator 63B is fixed by a constant current source 631 and a capacitive element 632 arranged outside the PWM controller 6. A potential is supplied. Other configurations are the same as those in FIG.

  FIG. 8 shows voltage waveforms at various parts of the power supply device shown in FIG. 7, and corresponds to FIG. 3 in the first embodiment.

  In this way, the potential V12 of the signal line L12 is a fixed potential and always higher than the potential of the oscillation pulse PLS1 as in the potential V11 of the signal line L11 (FIG. 3B) in the first embodiment. (FIG. 8D) and the potential V11 of the signal line L11 is controlled by the connection relationship as described above as in the potential V12 of the signal line L12 in the first embodiment (FIG. 3D). By setting the variable signal according to the correction potential of the signal L13 (FIG. 8B), the duty ratio of the control pulse PLS2 can be changed (FIG. 8E), and the lamp voltage V1 and the lamp power P are also changed. Since the values can be changed to be the rated values Vt and Pt, respectively (FIGS. 8F and 8A), the rated power control similar to that in the first embodiment can be performed.

  The processing operation performed by the control circuit during rated power control is basically the same as in the case of the first embodiment (flow charts shown in FIGS. 4 to 6). The difference from the case of the first embodiment is that, as a specific example of “the control content for driving the switching element in the rated power state” in the present invention, the setting value of the duty ratio of the control pulse PLS2 in the rated power state is changed. In addition, the correction potential of the control signal L13 output from the D / A converter 52 in the rated power state is stored.

  As described above, in the present embodiment, the control signal L13 output from the D / A converter 52 is connected to the non-inverting input terminal of the amplifier 61 via the adder 615 and superimposed on the reference potential V3 as a correction potential. In addition to this, the correction potential of the control signal L13 in the rated power state is stored, and the PWM drive for the N-channel FET 12 in the chopper circuit 1 is controlled using this correction potential. The margin of processing for the power supply device of the circuit 51 can be improved, and the same effect as in the case of the first embodiment can be obtained.

  Although the present invention has been described with reference to the first and second embodiments, the present invention is not limited to these embodiments, and various modifications can be made.

  For example, in the above-described embodiment, the case where the switching power supply circuit portion is configured by the chopper circuit 1 has been described. For example, when the DC input voltage Vin is lower than the lamp voltage, a boost circuit such as a flyback type is used. You may make it comprise by.

  Moreover, although the case where the inverter circuit 2 is configured by four full-bridge type switching elements has been described in the above embodiment, the inverter circuit 2 may be configured by, for example, a half-bridge type switching element.

  Moreover, although the case where the switching element in the chopper circuit 1 is configured by the N-channel FET 12 has been described in the above embodiment, the switching element may be configured by another switching element such as a bipolar transistor or IGBT.

  Further, in the above embodiment, when the lamp voltage V1 supplied from the chopper circuit 1 is AC converted by the inverter circuit 2 and the AC output voltage V2 is supplied to the high-intensity discharge lamp 8, that is, this power supply device is AC driven. However, for example, the lamp voltage V1 supplied from the chopper circuit 1 is directly supplied to the high-intensity discharge lamp 8, and the power supply device is configured by a DC type that is DC driven. It is also possible.

  In the above embodiment, as a specific example of “control content for driving of switching element in rated power state” in the present invention, the set value of the duty ratio of control pulse PLS2 in the rated power state and D in the rated power state The correction potential of the control signal L13 output from the / A converter 52 has been described above, but the control content to be stored is not limited to these, and other control content is configured to be stored. May be.

  Moreover, in the said embodiment, as shown to FIG.5, 6, although the stepwise control in an overpower state was divided into 3 steps (rated power control AC), the number of steps is limited to this. The rated power control can be performed with an arbitrary number of steps of 2 or more. In the above embodiment, stepwise rated power control is performed in an overpower state where the power value is larger than the rated power state, but conversely in a low power state where the power value is smaller than the rated power state. In addition, such a stepwise rated power control may be performed.

  Further, in the above embodiment, the circuit configuration of the power supply device and the operation configuration of the rated power control have been specifically described, but these configurations are not limited to this, and other circuit configurations and other An operation configuration may be adopted.

  Furthermore, in the above embodiment, the processing operation performed at the time of rated power control has been described with a specific processing configuration, but the processing configuration is not limited to this, and other processing configurations may be used. Good.

It is a circuit diagram showing the structure of the power supply device which concerns on the 1st Embodiment of this invention. It is a characteristic view showing the relationship between the mode of the PWM controller which a control circuit comprises, and a 2nd threshold voltage. FIG. 2 is a timing diagram for explaining the operation of the power supply device of FIG. 1. It is a flowchart for demonstrating the rated power control processing operation | movement in the power supply device of FIG. 5 is a flowchart showing the contents of a rated power control processing routine shown in FIG. 5 is a flowchart showing the contents of a rated power control processing routine shown in FIG. It is a circuit diagram showing the structure of the power supply device which concerns on the 2nd Embodiment of this invention. FIG. 8 is a timing chart for explaining the operation of the power supply device of FIG. 7.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Chopper circuit, 11 ... Input smoothing capacitor, 12 ... N channel FET, 13 ... Rectifier diode, 14 ... Choke coil, 15 ... Output smoothing capacitor, 2 ... Inverter circuit, 3 ... Current detection circuit, 4 ... Voltage detection circuit, DESCRIPTION OF SYMBOLS 51 ... Control circuit, 52 ... D / A converter, 6 ... PWM controller, 61 ... Amplifier, 611 ... Reference voltage power supply, 612 ... Constant voltage power supply, 613, 614 ... Resistor, 615 ... Adder, 62 ... Oscillation circuit , 63: Comparator, 64: Drive circuit, 7: Igniter, 8: High-intensity discharge lamp, T1, T2: Input terminal, T3, T4: Chopper circuit output terminal, T5, T6: Inverter output terminal, LH: Power line , LG ... ground line, I1 ... lamp current (DC output current), V1 ... lamp voltage (DC output voltage), V2 ... AC output voltage, V _D ... drain voltage, V _S ... Seo Scan voltage, V _G ... gate voltage, S1 to S4 ... switching device, PLS1 ... oscillation pulses, PLS2 ... driving pulses.

Claims (8)

A power supply that includes a switching power supply circuit that includes a switching element that switches a DC input voltage and generates a DC output voltage, and that performs predetermined periodic control so that the discharge lamp is lit at a constant power based on the generated DC output voltage A device,
Storage means for storing an identifier indicating whether or not the discharge lamp is in a rated power state in which constant power is lit at a predetermined range of power;
And a switching element driving circuit that controls driving of the switching element by using an identifier stored in the storage means. Determination means for determining whether or not the rated power state is based on the identifier stored by the storage means;
Control means for generating a control signal for setting the rated power state when the determining means determines that the rated power state is not established; and
The power supply device according to claim 1, wherein the switching element driving circuit controls driving of the switching element based on a control signal generated by the control unit. The power supply apparatus according to claim 2, wherein the control unit performs control to shift to a next cycle when the determination unit determines that the rated power state is set. A power supply that includes a switching power supply circuit that includes a switching element that switches a DC input voltage and generates a DC output voltage, and that performs predetermined periodic control so that the discharge lamp is lit at a constant power based on the generated DC output voltage A device,
A switching element driving circuit for controlling driving of the switching element;
Storage means for storing control details for driving the switching element in a rated power state where the discharge lamp is lit at a constant power with a predetermined range of power;
The switching element driving circuit controls the driving of the switching element by using the control content in the rated power state stored by the storage unit. Determining means for determining whether or not the rated power state;
Control means for generating a control signal for setting the rated power state based on the control content in the rated power state stored by the storage means when the determining means determines that the rated power state is not established; Further comprising
The power supply device according to claim 4, wherein the switching element driving circuit controls driving of the switching element based on a control signal generated by the control unit. When the determination unit determines that the rated power state is not satisfied, whether or not the control content for driving the switching element at that time coincides with the control content in the rated power state stored by the storage unit. Determine whether
The control means generates the control signal by resetting based on the control contents in the stored rated power state when the determination means determines that the control contents do not match each other. The power supply device according to claim 5. When the determination means determines that the power condition is not the rated power state, based on the control content in the rated power state stored by the storage means, the power value shift based on the power value in the rated power state is determined. Judge the degree,
6. The power supply according to claim 5, wherein the control unit performs stepwise control according to the degree of deviation of the power value based on a determination result of the degree of deviation of the power value by the determination unit. apparatus. When determining that the rated power state is not the rated power state, the determining unit determines whether the control content in the rated power state stored by the storage unit is within a predetermined range;
The said control means stops an apparatus, when it is judged that the control content in the rated power state memorize | stored by the said memory | storage means is not the thing within the said predetermined range. Power supply.

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