JP6384293B2 - Power supply device and lighting device - Google Patents

Power supply device and lighting device Download PDF

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JP6384293B2
JP6384293B2 JP2014240771A JP2014240771A JP6384293B2 JP 6384293 B2 JP6384293 B2 JP 6384293B2 JP 2014240771 A JP2014240771 A JP 2014240771A JP 2014240771 A JP2014240771 A JP 2014240771A JP 6384293 B2 JP6384293 B2 JP 6384293B2
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switching
power supply
circuit
voltage
control
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JP2016103904A (en
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徹 石北
徹 石北
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東芝ライテック株式会社
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Description

  Embodiments described herein relate generally to a power supply device that supplies power to a load and a lighting device that includes the power supply device.

  For example, in a power supply device using a light source as a load, AC power is rectified by a rectifier circuit, and the rectified DC voltage is converted to a predetermined DC voltage by a switching operation of a conversion switching element included in the power supply voltage conversion circuit and supplied to the light source. The light source is turned on. The power supply apparatus may use a power factor correction circuit having a power factor improvement switching element that boosts the rectified DC voltage and outputs the boosted DC voltage to the power supply voltage conversion circuit.

  In such a power supply device, in order to keep the brightness of the light source constant, the current flowing through the light source is detected, and the switching element for conversion is feedback controlled so that the detected current value is equal to a predetermined value (reference value). doing. In the current detection, there is one in which the current flowing through the light source is sampled at a predetermined sampling frequency.

  When a power supply device has a plurality of switching elements on the same board, the ground line is common, so that noise generated when each switching element is turned on and off affects all electric elements on the board. It is easy to affect. When the switching frequency of the switching element and the sampling frequency are synchronized, noise is superimposed on the sampled current value, and the current flowing through the light source cannot be accurately detected, thereby enabling proper feedback control for the conversion switching element. May not occur, and the brightness of the light source may flicker. For this reason, a power supply device that controls all the switching elements at different switching frequencies has been proposed (see, for example, Patent Document 1). According to this power supply device, by making the sampling frequency different from the switching frequency of each switching element, it is possible to suppress the influence of noise generated when the switching element is turned on and off with respect to the sampling value (detected current value).

  By the way, the power supply device includes a control power supply circuit that converts the DC voltage rectified by the switching element into a predetermined control power supply voltage. This control power supply circuit is formed in a step-down chopper circuit, and supplies operating power to a control circuit that controls the conversion switching element of the power supply voltage conversion circuit. A control power supply circuit is formed in an intelligent power device (IPD) element in order to reduce the size of a power supply device (see, for example, Patent Document 2). In the IPD element, the switching element operates at a switching frequency of 90 to 110 KHz, for example, and converts a DC voltage into a predetermined control power supply voltage.

JP 2013-229234 A (page 4-5, FIG. 1) JP 2012-174518 A (page 6-7, FIG. 1)

  In the IPD element, the switching frequency of the switching element changes with temperature. When the temperature of the IPD element rises greatly in the power supply device, the switching frequency of the switching element changes greatly and may synchronize with the sampling frequency for detecting the current flowing through the light source. Thereby, noise generated when the switching element of the IPD element is turned on and off may affect the sampling value.

  In addition, even when all the switching elements are controlled at different switching frequencies, the power supply device may turn on / off the switching elements to coincide with the sampling timing, and noise may affect the sampling value.

  It is an object of the present invention to provide a power supply device capable of reducing the influence of noise caused by a switching operation of a switching element and controlling a load output to be constant, and an illumination device including the power supply device.

The power supply device according to the present embodiment includes a DC power supply circuit having a first switching element ; a second switching element, and the output voltage of the DC power supply circuit is set to a predetermined DC voltage by the switching operation of the second switching element. A power supply voltage conversion circuit that converts the voltage into a load and supplies the load ; a current flowing through the load connected to the power supply voltage conversion circuit is detected, and when the detected current value continuously fluctuates more than a threshold value, the second Control means for controlling the second switching element to increase or decrease the switching frequency of the switching element to a predetermined value, and to increase or decrease the switching frequency of the second switching element when the detected current value fluctuates more than a threshold value. With.

  The control means detects a current flowing through a load connected to the power supply voltage conversion circuit, and controls the second switching element of the power supply voltage conversion circuit so that the detected current value becomes a predetermined value. And a control means increases / decreases the switching frequency of the 2nd switching element of a power supply voltage conversion circuit, when a detected electric current value fluctuates more than a threshold value.

  According to the power supply device of the present embodiment, the control means increases or decreases the switching frequency of the second switching element of the power supply voltage conversion circuit when the current value flowing through the load fluctuates more than a threshold value. Brightness flickering due to noise superposition generated in accordance with the switching operation of one switching element can be suppressed.

1 is a schematic circuit diagram of a power supply device showing a first embodiment of the present invention. The waveform in the power supply apparatus is shown in the same as above, (a) is a waveform diagram of the output voltage, (b) is a waveform diagram of the drive voltage of the second switching element, and (c) is a waveform diagram of the drive voltage of the first switching element. , (D) is another waveform diagram of the output voltage, and (e) is another waveform diagram of the drive voltage of the first switching element. FIG. 5 shows another waveform in the power supply device, where (a) is a waveform diagram of an output voltage, (b) is a waveform diagram of a drive voltage of the second switching element, and (c) is a waveform of the drive voltage of the first switching element. It is a waveform diagram. It is a partially cut away schematic side view of the illuminating device which shows the 2nd Embodiment of this invention.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, a first embodiment of the present invention will be described.

  As shown in FIG. 1, the power supply device 1 of the present embodiment is connected to an AC power supply Vs that is a commercial AC power supply, and supplies power to a plurality of loads 2 a and 2 b. In the present embodiment, the power supply device 1 is constituted by LEDs 3a and 3b whose loads 2a and 2b are semiconductor light emitting elements, and a lighting device that lights the LEDs 3a and 3b. The power supply device 1 is, for example, a ceiling light, a base light, or a downlight, and can be applied to a lighting device using a plurality of LEDs 3a and 3b.

  The power supply apparatus 1 includes a DC power supply circuit 4, power supply voltage conversion circuits 5a and 5b, and a control circuit 6 serving as control means.

  In this embodiment, the DC power supply circuit 4 includes a rectifier circuit 7, a power factor correction circuit 8, and a control power supply circuit 9.

  The rectifier circuit 7 includes a rectifier 10 and a capacitor C1 connected between the outputs of the rectifier 10. The input side of the rectifier 10 is connected to the input units 12 a and 12 b of the power supply device 1 through the filter circuit 11. The input units 12a and 12b are terminals, for example, and are connected to an AC power source Vs. The filter circuit 11 includes a transformer T1, a capacitor C2, and a varistor Z1. The rectifier circuit 7 full-wave rectifies an AC voltage (for example, AC 100 V) of the AC power supply Vs, and generates the rectified voltage between both ends of the capacitor C1.

  The power factor correction circuit 8 converts the rectified voltage across the capacitor C1 into a constant DC voltage, and is formed in a known boost chopper circuit. That is, the power factor improving circuit 8 includes a series circuit of an inductor L1 and a power factor improving switching element Qp connected between both ends of the capacitor C1, and a diode D1 connected between both ends of the power factor improving switching element Qp. And a series circuit of a smoothing capacitor C3. The power factor improving switching element Qp is a field effect transistor, and its gate (control terminal) is connected to the control unit 13. When the control unit 13 performs on / off control of the power factor improving switching element Qp at several tens KHz to about 200 KHz, the rectified voltage is chopped and boosted, and a constant direct current of 250 to 300 V is applied between both ends of the smoothing capacitor C3. Generate voltage. This DC voltage is output to the power supply voltage conversion circuits 5a and 5b.

  The control power supply circuit 9 supplies operating power to the control circuit 6, and includes a step-down chopper circuit that steps down the voltage across the smoothing capacitor C3 to a predetermined power supply voltage, for example, DC15V. In this embodiment, the control power supply circuit 9 is formed by intelligent power device (IPD) elements, which are electronic components integrated at high density, and peripheral circuits. The step-down chopper circuit is formed in a known circuit by a first switching element Q1 built in the IPD element, hereinafter, an inductor, a smoothing capacitor and a diode (not shown). The first switching element Q1 performs a switching operation at a switching frequency of 90 to 110 KHz, and outputs an operating power supply voltage of, for example, DC 15 V from the step-down chopper circuit.

  Thus, the DC power supply circuit 4 converts the AC voltage of the AC power supply Vs into a constant DC voltage and outputs it by the switching operation of the power factor improving switching element Qp of the power factor improving circuit 8. By the switching operation of one switching element Q1, an operating power supply voltage is formed from the constant DC voltage and output.

  The power supply voltage conversion circuits 5a and 5b are connected in parallel between both ends of the smoothing capacitor C3, and a constant DC voltage output from the DC power supply circuit 4 is input thereto. The power supply voltage conversion circuits 5a and 5b supply a predetermined DC voltage to the loads 2a and 2b, and are known step-down choppers that convert the output voltage (a constant DC voltage) of the DC power supply circuit 4 into a predetermined DC voltage. Formed in the circuit. In the present embodiment, the power supply voltage conversion circuits 5a and 5b have the same circuit configuration and specifications. Further, not only the two power supply voltage conversion circuits 5a and 5b but also one power supply voltage conversion circuit 5a may be provided between the outputs of the DC power supply circuit 4, or three or more power supply voltage conversion circuits 5a may be provided. May be.

  The power supply voltage conversion circuit 5a includes a series circuit of a diode D2, a second switching element Q2a and a resistor R1 connected between both ends of a smoothing capacitor C3, and a series circuit of a capacitor C4 and an inductor L2 connected in parallel to the diode D2. Are formed. The power supply voltage conversion circuit 5b is formed by a diode D3, a second switching element Q2b, a resistor R2, a capacitor C5, and an inductor L3 in the same manner as the power supply voltage conversion circuit 5a. Then, both ends of the capacitor C4 are connected to one output portion 14a, 14b of the power supply device 1, and both ends of the capacitor C5 are connected to the other output portion 15a, 15b. The output units 14a and 14b and the output units 15a and 15b are composed of terminals, for example. A load 2a is connected to the output units 14a and 14b, and a load 2b is connected to the output units 15a and 15b.

  The loads 2a and 2b are each composed of a plurality of LEDs 3a and 3b. The LEDs 3a and 3b are connected in series or in series and parallel, and emit visible light when a current flows.

  The second switching elements Q2a and Q2b are, for example, field effect transistors, and a drive voltage is supplied from the control power supply circuit 9 to their gates (control terminals). That is, the control power supply circuit 9 generates a drive voltage for turning on the second switching elements Q2a and Q2b in addition to the operation power supply voltage of the control circuit 6. A voltage adjusting resistor (not shown) or the like is provided between the gates of the second switching elements Q2a and Q2b and the control power supply circuit 9.

  The second switching elements Q2a and Q2b are on / off controlled by the switching operation of the switching elements Q3a and Q3b formed of field effect transistors. That is, when the switching elements Q3a and Q3b are turned on, the gates of the second switching elements Q2a and Q2b are connected to the negative side (ground line) of the DC power supply circuit 4, and the drive voltage output from the control power supply circuit 9 is No longer applied to the gates of the second switching elements Q2a and Q2b, and the second switching elements Q2a and Q2b are turned off. When the switching elements Q3a and Q3b are turned off, the drive voltage output from the control power supply circuit 9 is applied to the gates of the second switching elements Q2a and Q2b, and the second switching elements Q2a and Q2b are turned on. The switching elements Q3a and Q3b are on / off controlled by the control circuit 6. As a result, the second switching elements Q2a and Q2b are on / off controlled by the control circuit 6. In the present embodiment, the second switching elements Q2a and Q2b are on / off controlled at a switching frequency of 50 KHz, for example.

  When the second switching elements Q2a and Q2b are turned on, the output voltage (a constant DC voltage) of the DC power supply circuit 4 is applied to the output units 14a and 14b and the output units 15a and 15b. Strictly speaking, a DC voltage obtained by subtracting a voltage drop in the power supply voltage conversion circuits 5a and 5b from a constant DC voltage is applied. A DC voltage is supplied to the load 2a connected to the output units 14a and 14b and the load 2b connected to the output units 15a and 15b, and a current flows through the loads 2a and 2b.

  When the second switching elements Q2a and Q2b are turned off, the DC voltage is not applied to the output units 14a and 14b and the output units 15a and 15b, and no current flows through the loads 2a and 2b. This is performed at the switching frequency of the second switching elements Q2a and Q2b, and a rectangular wave voltage is supplied to the loads 2a and 2b. In the on / off control of the second switching elements Q2a and Q2b, the control circuit 6 controls the on period to vary the rectangular wave voltage supply period in one cycle, that is, the on duty period or the on duty ratio. Thus, the DC voltage conversion circuits 5a and 5b convert the output voltage of the DC power supply circuit 4 into a predetermined DC voltage and supply it to the loads 2a and 2b.

  The loads 2a and 2b increase linearly over a period from when the second switching elements Q2a and Q2b are turned on to when they are turned off by the action of the inductors L2 and L3 of the power supply voltage conversion circuits 5a and 5b. Current flows. This load current is detected by resistors R1 and R2 connected in series to the second switching elements Q2a and Q2b, converted to an output voltage and input to the control circuit 6 as shown in FIG. Resistors R1 and R2 together with the control circuit 6 constitute the control means of this embodiment.

  The control circuit 6 has a microprocessor (MPU). In the present embodiment, the control circuit 6 detects the current value of the load current input at the timing immediately before the second switching elements Q2a and Q2b are turned off. This detection timing is performed for each cycle of on / off control of the second switching elements Q2a and Q2b. That is, the frequency of the detection timing is equal to the switching frequency of the second switching elements Q2a and Q2b. Then, the control circuit 6 converts the detected current value (output voltage value) from an analog value to a digital value, and outputs the second value via the switching elements Q3a and Q3b so that the detected current value becomes a predetermined value set in advance. The switching elements Q2a and Q2b are controlled. Thereby, a constant current of a target value flows through the LEDs 3a and 3b which are the loads 2a and 2b.

  Further, as shown in FIG. 1, a dimming signal from the dimmer 16 is input to the control circuit 6 through the dimming control unit 17. The control circuit 6 varies the on / off control ratio (on-duty ratio) of the second switching elements Q2a and Q2b based on the input dimming signal. Thereby, the constant current according to a light control signal flows into LED3a, 3b, and LED3a, 3b is light-controlled.

  As shown in FIGS. 2A to 2C, the load current input to the control circuit 6 includes the switching operation of the second switching elements Q2a and Q2b and the first switching element of the control power supply circuit 9, for example. Noise due to the switching operation of Q1 is superimposed. That is, noise (not shown) due to on / off of the second switching elements Q2a and Q2b is superimposed at the time of rising and falling of the load current, and noise N1a due to on / off of the first switching element Q1 when the load current flows. N1b overlaps. The detection timing for detecting the current value of the load current is performed at a timing at which the noises N1a and N1b are not superimposed.

  The control circuit 6 determines that noise is superimposed on the detected current value when the detected current value fluctuates by more than a threshold value. Then, the switching frequency of the second switching elements Q2a and Q2b, for example, 50 KHz is increased or decreased to control the second switching elements Q2a and Q2b on and off. The threshold value may be appropriately set to a numerical value that causes noise caused by the switching operation of the first switching element Q1 and the like to cause the LEDs 3a and 3b to flicker. Current value. The control circuit 6 may determine that noise is superimposed on the detected current value when the detected current value is a current value more than a threshold value than a predetermined value to be compared. When the difference from the immediately preceding detected current value is equal to or greater than the threshold value, it may be determined that noise is superimposed on the detected current value.

  Next, the operation of the first embodiment of the present invention will be described.

  When the AC power supply Vs is turned on, the power supply device 1 outputs a constant DC voltage from the DC power supply circuit 4 to the power supply voltage conversion circuits 5a and 5b, and a predetermined power supply voltage from the control power supply circuit 9 to the control circuit 6. The operating power supply voltage is output. The control circuit 6 operates to control on / off of the switching elements Q3a, Q3b so that the second switching elements Q2a, Q2b perform a switching operation at an on-duty ratio based on a control signal from the dimmer 16. Here, the control circuit 6 switches the second switching elements Q2a and Q2b at a switching frequency of, for example, 50 KHz, and the first switching element Q1 of the control power supply circuit 9 switches at a switching frequency of 90 to 110 KHz, for example, 95 KHz. It is assumed that it is operating.

  The output voltage of the DC power supply circuit 4 is converted into a predetermined DC voltage according to the dimming signal by the power supply voltage conversion circuits 5a and 5b, and supplied to the LEDs 3a and 3b as the loads 3a and 3b. The LEDs 3a and 3b are lit (emitted) when a current flows, and emit visible light. The load current flowing through the LEDs 3a and 3b is detected by the resistors R1 and R2, converted into an output voltage, and input to the control circuit 6.

  The control circuit 6 detects the current value of the load current immediately before turning on the switching elements Q3a and Q3b, that is, immediately before turning off the second switching elements Q2a and Q2b. Here, the detection of the current value may be performed every cycle, or may be performed every two or more cycles, every tens to hundreds of cycles. Since the detection timing deviates from the on / off timing of the first switching element Q1 and the on / off timing of the second switching elements Q2a and Q2b, the detected current value is an approximately accurate current of the load current flowing through the LEDs 3a and 3b. Value.

  The control circuit 6 converts the detected current value of the analog value into a digital value, and the second switching element Q2a via the switching elements Q3a and Q3b so that the detected current value becomes a predetermined value corresponding to the dimming signal. , Q2b are controlled on and off. Thus, the LEDs 3a and 3b are lit at a dimming level corresponding to the dimming signal through a constant current of a target value corresponding to the dimming signal.

  The IPD element of the DC power supply circuit 9 is highly heated and rises in temperature due to the switching operation of the first switching element Q1. As the IPD element becomes high temperature, the switching frequency of the first switching element Q1 gradually increases from 95 KHz, and becomes almost a multiple of the switching frequency (50 KHz) of the second switching elements Q2a and Q2b. There is. Further, if the frequency of the detection timing of the detected current value and the switching frequency of the first switching element Q1 are different, even if there is a slight difference, the detection timing of the detected current value and the first switching element Q1 are eventually changed. The on / off timing is almost the same. As a result, as shown in FIGS. 2D to 2E, noise due to the switching operation of the first switching element Q1 is continuously superimposed on the load current at the detection timing, and for example, noise N1b is added to the detected current value. Are superimposed.

  When the control circuit 6 performs on / off control of the second switching elements Q2a and Q2b so that the detected current value on which the noise is superimposed becomes a predetermined value, a load current that fluctuates from the constant current of the target value flows in the LEDs 3a and 3b. . If the load current continues to fluctuate, the amount of visible light emitted from the LEDs 3a and 3b fluctuates and flickering occurs.

  Therefore, the control circuit 6 increases or decreases the switching frequency of the second switching elements Q2a and Q2b when the detected current value fluctuates by a predetermined threshold value or more. The increase / decrease width of the switching frequency may be within 10% of the controlled switching frequency. For example, the control circuit 6 changes the switching frequency of the second switching elements Q2a and Q2b from 50 KHz to, for example, 48 KHz.

  Moreover, in this embodiment, the control circuit 6 increases / decreases the switching frequency of 2nd switching element Q2a, Q2b, when the fluctuation | variation more than the threshold value of a detection electric current value is continuous several times, for example, 5 times. As a result, as shown in FIG. 3, there is a corresponding numerical difference between the detection timing frequency of the detection current value and a multiple of the switching frequency of the first switching element Q1, and the first detection timing of the detection current value is the first. The switching timing of the switching element Q1 is not matched. Therefore, the control circuit 6 can perform on / off control of the second switching elements Q2a and Q2b so that the detection current value that does not superimpose noise becomes a predetermined value set in advance. The LEDs 3a and 3b are lit when a constant current of a target value flows. The plurality of times may be appropriately set according to the detection timing frequency, detection accuracy, etc., such as several times to several hundreds times.

  Even if the switching frequency of the second switching elements Q2a and Q2b is decreased from 50 KHz to 48 KHz, the on-duty ratio of the on / off control does not change, so the current value per unit time of the load current flowing through the LEDs 3a and 3b changes. Instead, the LEDs 3a and 3b emit a constant output of visible light.

  In the present embodiment, when the detected current value does not fluctuate more than the threshold value over a predetermined period, for example, 1 second, the control circuit 6 sets the switching frequency reduced to 48 KHz to the initial switching frequency 50 KHz and sets the second switching element On / off control of Q2a and Q2b is performed. As a result, the second switching elements Q2a and Q2b are controlled to be turned on / off at the design switching frequency.

  Note that if the switching frequency of the first switching element Q1 is different from the switching frequency of the second switching elements Q2a and Q2b, the detection timing of the current value of the load current and the on-time of the first switching element Q1 The timing or the off timing is almost the same. Here, if the coincidence is single-shot, the fluctuation of the load current flowing through the LEDs 3a and 3b is very short, and the flickering of visible light is not felt.

  However, the control circuit 6 increases or decreases the switching frequency of the second switching elements Q2a and Q2b not only when the detected current value continuously fluctuates more than the threshold value but also when the detected current value of the load current fluctuates more than the threshold value. You may do it.

  According to the power supply device 1 of the present embodiment, the control circuit 6 uses the second power supply voltage conversion circuits 5a and 5b when the detected current value of the load current flowing through the LEDs 3a and 3b fluctuates more than a preset threshold value. Since the switching frequency of the switching elements Q2a and Q2b is increased or decreased, noise N1a and N1b due to the switching operation of the first switching element Q1 of the DC power supply circuit 4 can be suppressed from being superimposed on the detected current value. Control can be performed so that a constant current of the target value flows through 3b, and flickering in brightness can be suppressed.

  Further, the control circuit 6 increases or decreases the switching frequency of the second switching elements Q2a and Q2b of the power supply voltage conversion circuits 5a and 5b when the fluctuation of the load current with respect to the detected current value exceeds the threshold value continues. There is an effect that predetermined light output can be performed without causing flickering in visible light emitted from 3b.

  Further, the control circuit 6 sets the increased or decreased switching frequency to the initial switching frequency when the detected current value of the load current does not fluctuate for a predetermined period or more, and the second switching element Q2a of the power supply voltage conversion circuits 5a and 5b. , Q2b are on / off controlled, so that the power supply device 1 can be operated with the original design.

  The power supply device 1 is formed as an intelligent power device (IPD) element, which is an electronic component in which the control power supply circuit 9 of the DC power supply circuit 4 has the first switching element Q1 and is integrated with high density. Therefore, it has the effect that it can be reduced in size and weight.

  In the present embodiment, the loads 2a and 2b are not limited to the LEDs 3a and 3b, but may be other light sources such as EL elements, or may be electric devices other than the light sources.

  Next, a second embodiment of the present invention will be described.

  In FIG. 4, the illuminating device 21 of this embodiment is shown. In FIG. 4, the same parts as those in FIG.

  The illuminating device 21 is a ceiling light that is attached to a ceiling or the like. A decorative frame 24 is provided. An LED module 25 having LEDs 3 a and 3 b as semiconductor light emitting elements is disposed on the lower surface of the apparatus main body 22, and the power supply apparatus 1 shown in FIG. 1 is disposed in the hollow of the apparatus main body 22.

  When the external AC power supply Vs is turned on in the lighting device 1, the LEDs 3a and 3b are turned on by the power supply device 1. Visible light, such as white light, emitted from the LEDs 3a and 3b passes through the shade 23 and illuminates the space on the front side of the shade 23.

  Since the illuminating device 21 of the present embodiment includes the power supply device 1, it is possible to suppress occurrence of flickering or the like in the visible light emitted from the LEDs 3a and 3b.

  The above-described embodiment of the present invention has been presented as an example, and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Power supply device, 2a, 2b ... Load, 3a, 3b ... LED as a semiconductor light emitting element, 4 ... DC power supply circuit, 5a, 5b ... Power supply voltage conversion circuit, 6 ... Control circuit as control means, 9 ... Control power supply Circuit, 21 ... Lighting device, 22 ... Device main body, Q1 ... First switching element, Q2a, Q2b ... Second switching element, R1, R2 ... Resistor constituting control means

Claims (4)

  1. A DC power supply circuit having a first switching element;
    A power supply voltage conversion circuit which has a second switching element, converts the output voltage of the DC power supply circuit into a predetermined DC voltage by the switching operation of the second switching element, and supplies it to a load;
    A current flowing through the load connected to the power supply voltage conversion circuit is detected, and when the detected current value continuously fluctuates more than a threshold value, the switching frequency of the second switching element is increased or decreased to become a predetermined value. Control means for controlling the second switching element and increasing or decreasing the switching frequency of the second switching element when the detected current value fluctuates by more than a threshold value;
    A power supply device comprising:
  2. The control means according to claim 1, wherein the detected current value and controls the second switching element and the switching frequency is increased or decreased at the beginning of the switching frequency when no longer varies over a predetermined time period threshold Power supply.
  3. The DC power supply circuit includes a control power supply circuit that converts the output voltage of the DC power supply circuit into a predetermined power supply voltage by the switching operation of the first switching element and supplies the converted voltage to the control means. The power supply device according to claim 1 , wherein the power supply device is an electronic component integrated in a density.
  4. A power supply device according to any one of claims 1 to 3 ;
    A semiconductor light emitting element as the load that is turned on by the power supply device;
    An apparatus main body in which the power supply apparatus and the semiconductor light emitting element are disposed;
    An illumination device comprising:
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