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WO2018147133A1 - Dispositif d'alimentation électrique et dispositif de télévision - Google Patents

Dispositif d'alimentation électrique et dispositif de télévision Download PDF

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Publication number
WO2018147133A1
WO2018147133A1 PCT/JP2018/003064 JP2018003064W WO2018147133A1 WO 2018147133 A1 WO2018147133 A1 WO 2018147133A1 JP 2018003064 W JP2018003064 W JP 2018003064W WO 2018147133 A1 WO2018147133 A1 WO 2018147133A1
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WO
WIPO (PCT)
Prior art keywords
switching element
load
current
gate
power supply
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Application number
PCT/JP2018/003064
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English (en)
Japanese (ja)
Inventor
豊田　友博
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シャープ株式会社
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Publication date
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Publication of WO2018147133A1 publication Critical patent/WO2018147133A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/63—Generation or supply of power specially adapted for television receivers

Definitions

  • the present invention relates to a power supply apparatus and a television apparatus, and more particularly, to a power supply apparatus and a television apparatus that reduce noise.
  • EMI Electro Magnetic Interference
  • the switching circuit of the power supply circuit is large in terms of power, it has a great influence on EMI.
  • a high frequency component is generated at the time of switching from a switching element such as an FET used in a DC-DC converter or the like, and EMI and noise terminal voltage are deteriorated.
  • Patent Document 1 allows the rising or falling characteristics of an output signal to be set from the outside without adding or modifying design countermeasure components, and dynamically EMI. It is not something that reduces.
  • the present invention has been made in view of these circumstances, and an object of the present invention is to provide a power supply circuit and a television apparatus that dynamically reduce switching noise at light load.
  • a first technical means of the present invention includes an inductor connected to a power source, a capacitor charged with a current from the power source via the inductor, and a charging current to the capacitor.
  • a power supply device that includes a switching element for turning on / off and a control circuit that controls on / off of the switching element, and that supplies power to a load, wherein the control circuit has a large load current of the load.
  • the gate resistance value of the switching element is changed according to the temperature of the switching element.
  • the control circuit changes the gate resistance value to a larger value as the average value of the load current is smaller or the temperature of the switching element is lower. It is characterized by this.
  • the load is a load whose magnitude of the load current is changed according to a predetermined load mode
  • the control circuit includes the load mode.
  • the gate resistance value of the switching element is changed according to the above.
  • the fourth technical means is a television apparatus provided with a power supply device which is any one of the first to third technical means.
  • the fifth technical means is characterized in that, in the fourth technical means, the change of the gate resistance value of the switching element by the control circuit is performed at the time of starting or at the time of a scene change of an image.
  • switching noise at light load can be dynamically reduced.
  • FIG. 1 is a diagram for schematically explaining an example of a power supply device according to the present invention.
  • the power supply circuit 1 of the present invention converts the input voltage Vin and the input current Iin from the DC power supply 2 into an output voltage Vout and an output current Iout and supplies them to the load 5.
  • a DC-DC converter 3 is provided.
  • the AC power source in the case of a television apparatus using an AC power source, the AC power source is passed through an EMI filter, a full-wave rectifier circuit, a PFC (power factor correction circuit), an LLC (series resonance circuit), and a rectifier circuit.
  • a voltage may be obtained or a battery may be used.
  • the gate resistance value of the switching element of the DC-DC converter 3 is changed according to the magnitude of the load current.
  • This example corresponds to the first embodiment of the present invention.
  • the gate resistance value of the switching element is changed according to the temperature of the switching element of the DC-DC converter 3.
  • the load 5 is a backlight of the liquid crystal television device, and the gate resistance value of the switching element is changed according to the mode of the video signal.
  • This example corresponds to the third embodiment of the present invention.
  • an electronic switching element such as an FET is used for the DC-DC converter 3. It is known that a high frequency component is generated at the time of switching, and EMI and noise terminal voltage are deteriorated. In this case, even if the average load current is large, there is no problem with EMI if it is close to the DC current, but even if the average load current is small, the EMI deteriorates if the pulse current has a large peak value. There is.
  • the gate pulse waveform of an electronic switching element such as an FET
  • the rise time and fall time of the switching element can be delayed, and the generation of high-frequency noise due to switching can be suppressed.
  • the gate pulse waveform is smoothed, there is a problem that the temperature of the switching element rises.
  • the gate pulse waveform is smoothed by increasing the resistance value of the gate line that drives the FET that is the switching element of the DC-DC converter 3, that is, The switching noise of the FET is suppressed by changing the slope of the rising and falling waveforms.
  • the switching element focusing on the temperature of the switching element, when the load is light, the switching element does not exceed the allowable operating temperature range, so the temperature of the switching element is detected and the temperature falls below a predetermined temperature.
  • the resistance value of the gate line is increased to suppress the generation of switching noise.
  • FIG. 2 is a diagram illustrating a configuration of an embodiment of a power supply device according to the present invention, and corresponds to the schematic diagram of FIG.
  • a direct current power source 2 is used as a power source and an LED (light emitting diode) 51 used for a backlight of a liquid crystal television device or a liquid crystal display device is used as a load 5
  • the battery 5 may be a battery, and the load 5 is not limited to the LED of the backlight but can be various loads.
  • the power supply device 1 of this embodiment includes a DC-DC converter 3, a gate control circuit 4, and a load current detection circuit 6.
  • the configuration surrounded by the broken line of the gate control circuit 4 may be configured by an IC (integrated circuit).
  • the DC-DC converter 3 is supplied with an input voltage Vin from a DC power supply 2 and is supplied with an input current Iin. One output terminal of the DC power supply 2 is grounded.
  • the DC-DC converter 3 includes a capacitor 31 connected in parallel to the output terminal of the DC power supply 2, an inductor 32 connected to one DC line of the capacitor 31, a switching element 33 provided at the subsequent stage of the inductor 32, and switching A backflow prevention diode 34 and a smoothing capacitor 35 provided in the subsequent stage of the element 33 are provided. Both ends of the smoothing capacitor 35 correspond to output terminals of the power supply device, and a load 5 is connected to the subsequent stage.
  • the inductor 32 is an inductance element for generating an electromotive force by storing a current flowing according to a voltage supplied from the DC power supply 2 and the capacitor 31 as energy.
  • the switching element 33 is composed of, for example, an N-channel field effect transistor (FET), and is turned on when a high level signal is supplied to the gate, and is turned off when a low level signal is supplied to the gate.
  • FET field effect transistor
  • a gate signal from the gate control circuit 4 is supplied to the gate of the switching element 33. Since the switching frequency of the switching element 33 is generally several tens of kHz to several MHz, it is important to reduce noise from the switching element 33 as an EMI countermeasure.
  • the gate control circuit 4 changes the duty ratio of the gate signal supplied to the switching element 33 in accordance with the output voltage of the DC-DC converter 3, and the output voltage of the DC-DC converter 3 is a predetermined value. It is controlled to become. That is, the power supply apparatus constitutes a feedback control system based on the output voltage. For example, the predetermined value of the output voltage of the DC-DC converter 3 is set to a voltage at which the LED as a load is sufficiently lit.
  • the gate control circuit 4 includes resistors 41 and 42, an error amplifier 43, a reference voltage generation circuit 44, a pulse width modulation (PWM) circuit 45, a gate resistance value change circuit 46, a threshold voltage generation circuit 47, and a comparator 48. .
  • the output voltage Vout of the DC-DC converter 3 is divided by the resistors 41 and 42, and the divided voltage is connected to the inverting input terminal of the error amplifier 43.
  • the reference voltage Vr from the reference voltage generation circuit 44 is input to the non-inverting input terminal of the error amplifier 43.
  • a difference voltage between the reference voltage Vr and the divided voltage is output as an output signal of the error amplifier 43.
  • the output signal of the error amplifier 43 is input to the pulse width modulation circuit 45, and the pulse width modulation circuit 45 has a predetermined pulse frequency (several tens of kHz to several MHz) according to the magnitude of the output signal of the error amplifier 43.
  • a pulse signal with a changed pulse duty ratio is output.
  • the pulse signal from the pulse width modulation circuit 45 is applied to the gate of the switching element 33 of the DC-DC converter 3 through the gate resistance value changing circuit 46.
  • the switching element 33 Since the pulse signal from the pulse width modulation circuit 45 becomes the gate signal of the switching element 33, the switching element 33 is turned on in an on time corresponding to the duty ratio of the pulse signal from the pulse width modulation circuit 45.
  • the voltage of the resistor 61 is input to the inverting input terminal of the comparator 48, and the threshold voltage Vth from the threshold voltage generating circuit 47 is input to the non-inverting input terminal of the comparator 48. Because One resistor 61 the other is connected in series to the load 5 is grounded, the load current I F equal load 5 to the output current Iout of the DC-DC converter 3 is detected as a voltage value V IF at the resistor 61.
  • the load current is not a direct current but includes an alternating current such as a pulse current
  • an average value circuit and a low-pass filter (not shown) are provided in front of the comparator 48 so that the non-inverting input terminal of the comparator 48 is provided.
  • the voltage corresponding to the average value of the load current flowing through the load 5 is input.
  • the resistor 61 constitutes the load current detection circuit 6.
  • the voltage V IF of the threshold voltage Vth and the resistor 61 are compared, as a comparison signal, a binary signal of high level or low level is outputted.
  • the binary output signal from the comparator 48 is input to the gate resistance value changing circuit 46 and used to change the resistance value of the gate line of the switching element 33. The change of the resistance value of the gate line will be described in detail later.
  • FIG. 3 is a diagram showing the voltage waveform or current waveform of each part of the power supply device shown in FIG. 2.
  • the input voltage Vin, the input current Iin of the DC-DC converter 3, the gate signal Q of the switching element 33, and the switching element 33 are shown.
  • the switching element 33 is turned on at time t1, turned off at time t2, turned on at time t3, turned off at time t4, turned on at time t5, and turned off at time t6.
  • a path of the DC power source 2 is generated. Therefore, the voltage of the DC power supply 2 is an inductor 32, is applied to the switching element 33, the current I L of the inductor 32 as an inductance element is increased.
  • a current IQ flows through the switching element 33.
  • the current I L and the current I Q is the same size. With increasing current I L in the inductor 32, the energy stored in the inductor 32 increases.
  • the DC power source 2 When the switching element 33 is turned off at time t2, the DC power source 2, the inductor 32, the diode 34, the parallel circuit of the load 5 and the smoothing capacitor 35, and the path of the DC power source 2 are generated. Then, power from the DC power source 2 is supplied to the smoothing capacitor 35 and the load 5 via the diode 34 as energy stored in the inductor 32.
  • the current ID flowing through the diode 34 is a current obtained by adding the current IC2 flowing through the smoothing capacitor 35 and the load current. Therefore, current obtained by subtracting the load current I F from the current flowing through the current I D flowing through the diode 34 but flows into the smoothing capacitor 35, decreasing charged in the smoothing capacitor 35 with time. Further, the output voltage Vout of the DC-DC converter 3 becomes higher than the input voltage Vin.
  • the switching element 33 is turned off at time t3, the path of the DC power source 2, the inductor 32, the switching element 33, and the DC power source 2 is generated as in the time t1, and the same current flows.
  • a load current is supplied from the smoothing capacitor 35 to the load 5. In this way, power is supplied to the load 5 both when the switching element 33 is on and when it is off.
  • the current I C1 flowing through the capacitor 31 and the current I C2 flowing through the smoothing capacitor 35 have an AC component corresponding to the on / off state of the switching element 33.
  • the load 5 is directed to the LED (light emitting diode) 51 used for the backlight of the liquid crystal television device or the liquid crystal display device, but the brightness of the backlight is dimming. It is adjusted by the switching signal from the signal generation circuit 9. More specifically, the current flowing through the LED 51 is switched at a frequency with no visual problem by a switching element 52 such as a field effect transistor (FET). The brightness is adjusted by the on-duty of the switching signal. Note that the switching frequency of the switching element 52 is at most several hundred Hz, and a frequency considerably lower than the switching frequency of the switching element 33 of the DC-DC converter 3 is used.
  • a switching element 52 such as a field effect transistor (FET).
  • FIG. 4 is a diagram illustrating a current flowing through the load of the power supply device illustrated in FIG. 2.
  • FIG. 4A illustrates a case where the backlight is lit brightly, and the on-duty of the switching signal of the switching element 52 is 100%. It is said. In this case, the load current I F becomes almost a direct current, the average load current I FAVE also increased.
  • FIG. 4B shows a case where the backlight does not need to be lit brightly, and the on-duty of the switching signal of the switching element 52 is, for example, 50%. In this case, the load current I F becomes substantially pulse-shaped current, the average load current I FAVE is smaller than when the on-duty of 100%. However, since the pulse current flows when the average current I FAVE shown in FIG.
  • the gate control circuit 4 tries to maintain the output voltage Vout of the DC-DC converter 3 at a voltage value necessary for lighting the LED 51.
  • the duty ratio D of 33 is increased. Thereby, current I Q flowing through the switching element 33 increases, the temperature of the switching element 33 of the DC-DC converter 3 is increased.
  • the gate control circuit 4 tries to maintain the output voltage Vout of the DC-DC converter 3 at a voltage value necessary for lighting the LED 51. Since F is small, it is not necessary to increase the duty ratio D of the switching element 33 and an attempt is made to maintain a small value. Thereby, current I Q flowing through the switching element 33 is decreased, the temperature of the switching element 33 is not large to increase. In this case, the temperature of the switching element 33 such as an FET and the temperature of the solder surface have a relatively margin with respect to the reference value.
  • the gate pulse waveform is smoothed by increasing the resistance value of the gate line that drives the switching element 33 of the DC-DC converter 3, and the switching element The rise time and fall time are slowed down to suppress the generation of high frequency noise due to switching.
  • FIG. 5 is a diagram for explaining a gate resistance value changing circuit and a gate signal waveform of the power supply device shown in FIG. 2, and will be described together with FIG.
  • the comparator 48 compares the threshold voltage Vth and the voltage V IF of the resistor 61, and the binary output signal from the comparator 48 is input to the gate resistance value changing circuit 46.
  • the resistance value of the resistor R 2 is greater than the resistance value of the resistor R 1, for example, resistor R 1 is 0 .OMEGA, resistance R 2 has a 200 [Omega.
  • the comparator 48 outputs a low level signal, the gate resistance value changing circuit 46, switching the switch SW so that the resistance value of the gate line becomes a value of less resistance R 1 of the switching element 33.
  • a gate signal having a good pulse waveform in which the rise and fall are not inclined is applied to the gate of the switching element 33, and the temperature rise of the switching element is suppressed.
  • the comparator 48 when the voltage V IF resistor 61 is smaller than the threshold voltage Vth, that is, when the load current I F is smaller than the predetermined value, the comparator 48 outputs a high signal, the gate resistance value changing circuit 46, switching Since the time constant of the RC circuit is large due to the resistance between the gate line of the element 33 having a large gate line resistance and the capacitance between the gate and source of the switching element 33, the waveform of the gate signal is as shown in FIG. It becomes a so-called sluggish shape with rising and falling slopes. Thereby, although the temperature of the switching element 33 rises, the generated noise can be suppressed.
  • the magnitude of the threshold voltage Vth, the resistance value of the resistor 61 for the load current I F detected, the resistance value of the resistor R 2 is set so that the switching element 33 falls within the allowable temperature range.
  • the switch the two values as the resistance value of the gate line of the switching element 33 may be switched to three or more resistance, further, the magnitude of the load current I F Accordingly, the resistance value of the gate line may be changed continuously.
  • FIG. 6 is a diagram showing the configuration of another embodiment of the power supply device according to the present invention, and corresponds to the schematic diagram of FIG.
  • a direct-current power source 2 is used as a power source
  • an LED (light emitting diode) 51 used as a backlight of a liquid crystal television device or a liquid crystal display device is used as a load 5 as in the first embodiment.
  • the power source may be a battery
  • the load 5 is not limited to the LED of the backlight but can be various loads.
  • the power supply device 1 of this embodiment includes a DC-DC converter 3, a gate control circuit 4, and an element temperature detection circuit 7.
  • the configuration surrounded by the broken line of the gate control circuit 4 can be configured by an IC (integrated circuit).
  • the basic configuration of the DC-DC converter 3 and the gate control circuit 4 is the same as that of the first embodiment shown in FIG. 2, and in the first embodiment, the magnitude of the load current IF is large.
  • the gate resistance value of the switching element 33 of the DC-DC converter 3 is changed accordingly, whereas in the present embodiment, the gate resistance of the switching element 33 depends on the temperature of the switching element 33 of the DC-DC converter 3. The value has been changed.
  • the description of the same configuration as that of the first embodiment will be omitted, and a different configuration will be described.
  • Element temperature detecting circuit 7 for detecting the temperature of the switching element 33 is provided.
  • the voltage V T obtained by dividing the constant voltage by the voltage dividing resistor circuit of the thermistor 71 and the resistor 72 is the temperature of the switching element 33.
  • the value increases with the rise.
  • the comparator 48 If the voltage V T is greater than the threshold voltage Vth, i.e., when the temperature of the switching element 33 is higher than the predetermined value, the comparator 48 outputs a low level signal, the gate resistance value changing circuit 46, the switching element the resistance of the gate line 33 assumes a value smaller resistor R 1 so switches the switch SW.
  • a gate signal having a good pulse waveform in which the rising and falling edges are not inclined is applied to the gate of the switching element 33, and the temperature rise of the switching element 33 is suppressed.
  • the gate resistance changing circuit 46 switches the switch SW to a value of the resistor R 2 the resistance value is large gate line of the switching element 33.
  • the time constant of the RC circuit due to the resistance of the gate line of the switching element 33 and the capacitance between the gate and source of the switching element 33 increases, so that the waveform of the gate signal rises and falls as shown in FIG.
  • the so-called slanted shape is inclined. Thereby, although the temperature of the switching element 33 rises, the generated noise can be suppressed.
  • the magnitude of the threshold voltage Vth, characteristic resistance value of the thermistor 71, the resistance value of the resistor 72, the resistance value of the resistor R 2, is set so that the switching element 33 becomes the allowable temperature range.
  • two values are switched as the resistance value of the gate line of the switching element 33.
  • three or more resistance values may be switched.
  • the resistance value of the gate line may be continuously changed according to the temperature of the switching element 33.
  • FIG. 7 is a diagram illustrating a configuration of an embodiment when a television apparatus is applied to the power supply device according to the present invention, and corresponds to the schematic diagram of FIG.
  • a DC power source 2 is used as a power source
  • an LED (light emitting diode) 51 used as a backlight of a liquid crystal television device is used as a load 5 as in the first embodiment.
  • the television apparatus of this embodiment includes a DC-DC converter 3, a gate control circuit 4, and a dimming signal generation circuit 9.
  • the configuration surrounded by the broken line of the gate control circuit 4 can be configured by an IC (integrated circuit).
  • the basic configuration of the DC-DC converter 3 and the gate control circuit 4 is the same as that of the first embodiment shown in FIG. 2, and in the first embodiment, the magnitude of the load current IF is large.
  • the gate resistance value of the switching element 33 of the DC-DC converter 3 is changed accordingly, in the present embodiment, in the television device, the current consumption of the backlight in a specific video mode such as a movie mode. Note that the gate resistance value of the switching element 33 of the DC-DC converter 3 is changed according to the mode of the video signal.
  • the description of the same configuration as that of the first embodiment will be omitted, and a different configuration will be described.
  • the gate control circuit 4 includes a mode analysis unit 49 that receives a mode signal input from the video signal mode input terminal.
  • the threshold voltage generation circuit 47 included in the first embodiment, and The comparator 48 is not provided.
  • the mode signal input from the video signal mode input terminal is also input to the dimming signal generation circuit 9.
  • the dimming signal generation circuit 9 adjusts the current flowing through the LED 51 in accordance with the mode signal input from the video signal mode input terminal. For example, when the mode signal is the movie mode, by inputting a switching signal having a small on-duty ratio to the switching element 52, the current flowing through the LED 51 is suppressed, and a dark image is displayed on a liquid crystal screen (not shown). When the mode signal is dynamic mode, a switching signal having a large on-duty ratio is input to the switching element 52, whereby the current flowing through the LED 51 is increased and an image with a large contrast is displayed. Thus, the magnitude of the load current of the backlight is changed according to a load mode such as a predetermined video mode.
  • a load mode such as a predetermined video mode.
  • the mode analysis unit 49 of the gate control circuit 4 analyzes the mode signal input from the video signal mode input terminal, and outputs a resistance change signal to the gate resistance value change circuit 46 according to the mode signal.
  • the mode signal when a movie mode, the gate resistance value changing circuit 46 outputs a resistance change signal to a value of the resistance value is large R 2 gate line of the switching element 33.
  • the waveform of the gate signal has a so-called distorted shape in which the rising edge and the falling edge are inclined as shown in FIG. Thereby, although the temperature of the switching element 33 rises, the generated noise can be suppressed.
  • the mode analyzing portion 49 of the gate control circuit 4 if the mode signal is in the dynamic mode, so that the gate resistance value changing circuit 46 becomes a value of the resistor R 1 a small resistance value of the gate line of the switching element 33 Outputs a resistance change signal.
  • a gate signal having a good pulse waveform in which the rising and falling edges are not inclined is applied to the gate of the switching element 33, and the temperature rise of the switching element 33 is suppressed.
  • the movie mode and the dynamic mode have been described as examples of the video signal mode.
  • the video signal mode need not be limited to this.
  • the backlight load current IF is reduced by receiving the mode signal of the dark mode, and the switching element 33 may be controlled to a value of the resistor R 2 the resistance value is large gate lines.
  • the resistance R the resistance of the gate line is larger switching element 33 It can be controlled to be a value of 2 .
  • a scene change or the like is performed in order to avoid a visual influence when the output voltage of the DC-DC converter 3 varies by changing the resistance value of the gate line of the switching element 33. It is desirable to change the resistance value at the video switching timing.
  • SYMBOLS 1 Power supply device, 2 ... DC power supply, 3 ... DC-DC converter, 4 ... Gate control circuit, 5 ... Load, 6 ... Load current detection circuit, 7 ... Element temperature detection circuit, 9 ... Dimming signal generation circuit, 31 DESCRIPTION OF SYMBOLS Capacitor 32 ... Inductor 33 ... Switching element 34 ... Diode 35 ... Smoothing capacitor 41, 42 ... Resistor 43 ... Error amplifier 44 ... Reference voltage generation circuit 45 ... Pulse width modulation circuit 46 ... Gate Resistance value changing circuit, 47... Threshold voltage generating circuit, 48... Comparator, 49... Mode analysis unit, 51... LED, 52.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Dc-Dc Converters (AREA)
  • Television Receiver Circuits (AREA)

Abstract

L'invention concerne un dispositif d'alimentation électrique et un dispositif de télévision qui réduisent dynamiquement un bruit de commutation sous une charge légère. Ce dispositif d'alimentation électrique est pourvu : d'une bobine d'induction (32) connectée à un bloc d'alimentation en courant continu (2); d'un condensateur (35) dans lequel un courant est chargé à partir du bloc d'alimentation par l'intermédiaire de la bobine d'induction (32); et d'un élément de commutation (33) pour la commande marche-arrêt du courant de charge vers le condensateur (35), et qui fournit de l'énergie à une charge (5). Lorsque l'amplitude d'un courant de charge IF de la charge (5) est faible, l'apparition de bruit est empêchée par l'augmentation d'une valeur de résistance de grille de l'élément de commutation (33) pour atténuer une forme d'onde d'impulsion de grille. De plus, lorsque la température de l'élément de commutation (33) est faible, la valeur de résistance de grille de l'élément de commutation (33) peut également être augmentée.
PCT/JP2018/003064 2017-02-13 2018-01-31 Dispositif d'alimentation électrique et dispositif de télévision WO2018147133A1 (fr)

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JP2017-024488 2017-02-13
JP2017024488A JP2018133852A (ja) 2017-02-13 2017-02-13 電源装置およびテレビジョン装置

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Cited By (2)

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TWI692982B (zh) * 2018-11-02 2020-05-01 茂達電子股份有限公司 背光裝置及其調光控制方法
WO2024135296A1 (fr) * 2022-12-22 2024-06-27 株式会社デンソー Dispositif de commande

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Publication number Priority date Publication date Assignee Title
KR102612829B1 (ko) * 2018-12-19 2023-12-11 엘지마그나 이파워트레인 주식회사 전력변환장치, 및 이를 구비하는 차량
JP2021005959A (ja) * 2019-06-26 2021-01-14 ファナック株式会社 入力直流電圧を出力直流電圧に変換するスイッチングレギュレータ回路

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005168171A (ja) * 2003-12-02 2005-06-23 Toyota Motor Corp 電力変換装置およびそれを備える自動車
JP2009136138A (ja) * 2007-11-07 2009-06-18 Panasonic Corp パワースイッチング素子の駆動回路、その駆動方法及びスイッチング電源装置
JP2009296721A (ja) * 2008-06-03 2009-12-17 Denso Corp 昇圧電源装置及び駆動装置
JP2013205717A (ja) * 2012-03-29 2013-10-07 Panasonic Corp 光源駆動装置、表示装置、車載装置
JP2014103485A (ja) * 2012-11-19 2014-06-05 Rohm Co Ltd スイッチ駆動回路

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3716004B2 (ja) * 1995-03-16 2005-11-16 日産自動車株式会社 車両用エンジンの検査装置及び検査方法
JP3865224B2 (ja) * 2002-03-15 2007-01-10 株式会社デンソー 電動パワーステアリング装置
JP2004045139A (ja) * 2002-07-10 2004-02-12 Ono Sokki Co Ltd エンジン回転計
JP4209730B2 (ja) * 2003-07-22 2009-01-14 東光株式会社 スイッチング定電流電源装置
JP2011078193A (ja) * 2009-09-30 2011-04-14 Sharp Corp 映像表示装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005168171A (ja) * 2003-12-02 2005-06-23 Toyota Motor Corp 電力変換装置およびそれを備える自動車
JP2009136138A (ja) * 2007-11-07 2009-06-18 Panasonic Corp パワースイッチング素子の駆動回路、その駆動方法及びスイッチング電源装置
JP2009296721A (ja) * 2008-06-03 2009-12-17 Denso Corp 昇圧電源装置及び駆動装置
JP2013205717A (ja) * 2012-03-29 2013-10-07 Panasonic Corp 光源駆動装置、表示装置、車載装置
JP2014103485A (ja) * 2012-11-19 2014-06-05 Rohm Co Ltd スイッチ駆動回路

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI692982B (zh) * 2018-11-02 2020-05-01 茂達電子股份有限公司 背光裝置及其調光控制方法
WO2024135296A1 (fr) * 2022-12-22 2024-06-27 株式会社デンソー Dispositif de commande

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