WO2014017279A1 - Dc/dcコンバータ及び表示装置 - Google Patents
Dc/dcコンバータ及び表示装置 Download PDFInfo
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- WO2014017279A1 WO2014017279A1 PCT/JP2013/068600 JP2013068600W WO2014017279A1 WO 2014017279 A1 WO2014017279 A1 WO 2014017279A1 JP 2013068600 W JP2013068600 W JP 2013068600W WO 2014017279 A1 WO2014017279 A1 WO 2014017279A1
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- magnetic field
- converter
- inductor
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- voltage
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/06—Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
- G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/327—Means for protecting converters other than automatic disconnection against abnormal temperatures
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Definitions
- the present invention relates to a DC / DC converter and a display device, and more particularly to a DC / DC converter and a display device used under a strong magnetic field.
- a display device for medical use when a display device is installed in an environment where a magnetic field generator such as MRI (Magnetic Resonance Imaging system) is used and used as a monitor, the electronic component driving the display device is It is conceivable that a malfunction may occur due to the influence of a change in the surrounding magnetic field, causing an unexpected operation. Specifically, the inductor included in the power supply circuit for driving the display device is directly affected by the surrounding magnetic field, and thus operates differently from the expected operation. The power supply circuit may malfunction. An integrated circuit (IC) may be affected by a magnetic field, and may operate differently from an expected operation.
- IC integrated circuit
- a switching circuit used for a booster circuit or a step-down circuit.
- This switching circuit is mainly composed of an inductor, a field effect transistor (FET), a rectifying diode, and a smoothing capacitor, and converts an input voltage to generate an output voltage having a voltage value different from the input voltage.
- FET field effect transistor
- the DC / DC converter is provided with an overcurrent prevention circuit for preventing dangers such as heat generation and ignition of electronic components when the output current becomes abnormally large.
- a display device equipped with a DC / DC converter having such a configuration When a display device equipped with a DC / DC converter having such a configuration is placed under a strong magnetic field (referred to as a strong magnetic field), if the inductor is affected by the magnetic field and moves in the direction of magnetic flux saturation, the current flows. When the value increases and exceeds the threshold value of the overcurrent prevention circuit, the DC / DC converter enters a latch operation. When the latch operation is activated, the DC / DC converter stops outputting, and as a result, the display device stops and nothing is displayed. That is, when the display device is placed under a strong magnetic field, there is a problem that the display device suddenly stops due to a change in the surrounding magnetic field, and a work for returning the stopped display device again is necessary.
- Patent Document 1 includes an AC / DC converter that converts an AC voltage of an AC power source into a DC voltage, a smoothing capacitor that smoothes the DC voltage, and a power transistor.
- the switching circuit that converts the smoothed DC voltage into the AC voltage is compared with the command voltage and the carrier wave, and the power transistor of the switching circuit is controlled on / off.
- a PWM circuit that outputs a control signal, and the magnetic flux saturation of a reactor for suppressing harmonic noise connected between the AC power supply and the power converter is determined.
- a power converter including a comparator that changes a switching frequency is disclosed.
- a magnetic flux detected by a magnetic flux detector is compared with a threshold level that is designated in advance.
- the oscillation frequency that controls the power transistor of the power supply circuit is reduced to avoid the LC resonance frequency composed of the reactor and the smoothing capacitor attached to the reactor.
- the magnetic flux is detected again, and when the magnetic flux is larger than the detected magnetic flux, the oscillation frequency is increased and the oscillation frequency is changed to a frequency region where the reactor is not magnetically saturated.
- Patent Document 2 listed below is a power control device that generates power for driving an amplifier circuit that amplifies a transmission signal, and a transmission signal to be output from the amplifier circuit according to the transmission signal.
- a generating unit that generates a PWM signal based on a maximum voltage value per unit time, a selecting unit, and a plurality of inductors having different inductances, and the inductor selected by the selecting unit among the plurality of inductors
- a power generation unit that generates the power based on the PWM signal, and the selection unit acquires a value reflecting the maximum voltage value, and the value is set in advance.
- a power control device that compares one or more threshold values and selects an inductor to be used in the power generation unit according to a comparison result. This publication describes that two booster circuit lines are prepared in advance in a booster circuit, and a booster path (mainly an inductor) is changed according to an output voltage value and a load.
- Patent Document 3 listed below includes a reactor and a switching element, and a voltage converter that converts an input voltage into a predetermined output voltage by controlling an amount of current flowing through the reactor by periodic switching control of the switching element. Obtained by the current detection unit at a plurality of timings including a timing different from the center timing of the ON or OFF period of the switching element. And a detection control unit that detects a change in the capacity of the reactor based on a plurality of detected values and a reference value related to the detected value when the capacity of the reactor is a predetermined value. Yes. In this publication, if the reactor current increases due to reactor deterioration or the like, the current is detected, and the difference between the detected current value and the normal state (reference value) is compared. Or reducing the SW cycle.
- Patent Document 4 discloses an actuator driving apparatus for driving an electromagnetic actuator, in which a boosting circuit for boosting a power supply voltage is provided, and a post-boosting voltage control means is provided on the downstream side of the boosting circuit. ing.
- the input voltage is monitored, and when the input voltage drops, the output voltage is reduced by switching the F / B voltage dividing resistance value of the booster, and the switch is turned ON / OFF according to the determination result of the input voltage sensor. It is described to do.
- Patent Document 5 two main reactors divided into two equivalently constituting one reactor and one pole are connected to one end of a series connection body of the main reactor, and the other pole is connected to a DC power source.
- a main switch directly connected to one of the voltage terminals, a series connection of a snubber diode and a snubber capacitor connected to both ends of the main switch, a connection point of the snubber diode and the snubber capacitor, and the two
- An auxiliary switch connected to the connection point of the series connection of the main reactor, and the auxiliary switch is a chopper that sets the voltage at the turn-on of the main switch to zero by setting the voltage of the snubber capacitor to zero.
- a circuit is disclosed. This publication describes a soft switching operation in which S2 is turned on slightly earlier than S1 with respect to the ON / OFF timing of each switch, and a regenerative operation in which S2 and S1 are turned on simultaneously or S2 is turned on later than S1.
- Patent Document 2 two power generation lines are prepared, and the power generation unit (coil, FET, smoothing capacitor, etc.) is switched between when the load is large and when the load is small.
- the power generation unit coil, FET, smoothing capacitor, etc.
- the output part of the Hall element is not directly connected to the end of the switch (transistor or FET gate), and only the input voltage is monitored to turn the switch ON / OFF. Since the determination is made, the conventional switch does not operate under a strong magnetic field, and the DC / DC converter may stop due to an overcurrent.
- the present invention has been made in view of the above problems, and a main object of the present invention is to avoid that the DC / DC converter shuts down and the display device stops even when placed in a strong magnetic field.
- An object of the present invention is to provide a DC / DC converter and a display device that can be used.
- the present invention provides an inductor having one end connected to an input terminal, a switching element connected between the other end of the inductor and ground, and the other end of the inductor and an output terminal.
- a diode connected in between, a capacitor connected between the output terminal and ground, a feedback circuit connected between the output terminal and ground, and outputting a feedback voltage obtained by dividing the output voltage;
- An external magnetic field is detected in a DC / DC converter including an oscillation circuit that receives the feedback voltage and controls ON / OFF of the switching element at a frequency corresponding to the feedback voltage, and the detected magnetic field has a predetermined threshold value
- a detection circuit that outputs a different signal depending on whether or not the signal exceeds the DC /
- By controlling the C converter in which and a control circuit for suppressing the overcurrent of the DC / DC converter in a strong magnetic field under.
- the DC / DC converter and the display device of the present invention it is possible to prevent the display device from stopping due to the DC / DC converter shutting down even when placed under a strong magnetic field.
- the DC / DC converter detects a magnetic field and outputs a different signal depending on whether or not the detected magnetic field exceeds a predetermined threshold, and depending on the output signal , Increase the oscillation frequency for ON / OFF control of the switching FET, increase the inductance value by connecting another inductor in series, increase the F / B voltage by disconnecting the voltage dividing resistor, This is because a latching operation avoidance circuit under a strong magnetic field is provided to control the DC / DC converter so as not to enter a latching operation when it is detected that it is under a strong magnetic field.
- FIG. 1 is a block diagram illustrating an overall configuration of a display device according to a first embodiment of the present invention. It is a block diagram which shows the structure of the DC / DC converter which concerns on the 1st Example of this invention. It is a figure which shows the control operation of the oscillation frequency in the DC / DC converter which concerns on 1st Example of this invention. It is a block diagram which shows the structure of the DC / DC converter which concerns on the 2nd Example of this invention. It is a figure which shows the control operation of the inductance in the DC / DC converter which concerns on the 2nd Example of this invention. It is a block diagram which shows the structure of the DC / DC converter which concerns on the 3rd Example of this invention.
- FIG. 10 is a diagram illustrating a circuit configuration example of a power conversion device disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2004-260963).
- FIG. 11 is a diagram illustrating a circuit algorithm of a power conversion device disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2004-260963).
- FIG. 11 is a diagram illustrating a circuit configuration example of a power control device disclosed in Patent Document 2 (Japanese Patent Laid-Open No. 2009-225592).
- FIG. 10 is a diagram illustrating a circuit configuration example of a power conversion device disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2004-260963).
- FIG. 11 is a diagram illustrating a circuit configuration example of a power control device disclosed in Patent Document 2 (Japanese Patent Laid-Open No. 2009-225592).
- FIG. 11 is a diagram illustrating a circuit configuration example of a detection circuit disclosed in Patent Document 3 (Japanese Patent Laid-Open No. 2010-279150).
- FIG. 11 is a diagram illustrating a circuit configuration example of an actuator driving device disclosed in Patent Document 4 (Japanese Patent Laid-Open No. 2005-333768). It is a figure which shows the circuit structural example of the chopper circuit of the former (WO2006-098376).
- an overcurrent prevention circuit (latch circuit) provided in the DC / DC converter may operate.
- the latch circuit When the latch circuit is activated, the DC / DC converter turns off the output voltage after a certain period of time (shutdown), so that the video of the display device is not displayed and is stopped. It is necessary to input.
- an inductor having one end connected to the input terminal, a switching element connected between the other end of the inductor and the ground, and the other end of the inductor and the output terminal A diode connected in between, a capacitor connected between the output terminal and the ground, a feedback circuit connected between the output terminal and the ground, and outputting a feedback voltage obtained by dividing the output voltage;
- An external magnetic field is detected in a DC / DC converter including an oscillation circuit that receives the feedback voltage and controls ON / OFF of the switching element at a frequency corresponding to the feedback voltage, and the detected magnetic field has a predetermined threshold value And a detection circuit that outputs a different signal depending on whether or not the signal exceeds the DC / By controlling the C converter, and a control circuit for suppressing the overcurrent of the DC / DC converter in a strong magnetic field under.
- the circuit configuration is such that the display device does not stop even when placed under a strong magnetic field, that is, the DC / DC converter does not shut down
- a strong magnetic field detection circuit that detects the presence of a strong magnetic field, and a strong magnetic field latch that controls the DC / DC converter so as not to enter a latch operation when the strong magnetic field is detected.
- a circuit configuration including an operation avoidance circuit is configured using, for example, a Hall element (Hall IC) that switches output logic (Hi or Low) in response to the strength of the surrounding magnetic field.
- a latch operation avoidance circuit under a strong magnetic field for example, a circuit (oscillation frequency control circuit, inductance control circuit, F / B voltage control circuit, etc.) that changes the output voltage generation operation of the DC / DC converter according to the output state of the Hall IC ).
- FIG. 1 is a block diagram showing the configuration of the display device of this embodiment
- FIG. 2 is a block diagram showing the configuration of the DC / DC converter of this embodiment
- FIGS. 3A to 3D are diagrams showing the control operation of the oscillation frequency in the DC / DC converter.
- a display device 10 of this embodiment includes a power supply source 20 such as a battery, a power generation circuit 30 such as a DC / DC converter, a video signal supply source 40 that supplies a video signal, and a video.
- a video signal processing circuit 50 such as an IC for processing a signal
- a display device driver 60 such as an IC for driving a display device
- a display device scanning driver 70 such as an IC for scanning the display device
- LCD for displaying an image Etc.
- an inductor is used for the power generation circuit 30, and this inductor malfunctions due to the influence of the magnetic field.
- the power generation circuit 30 operates normally even under a strong magnetic field.
- FIG. 1 As an example of the power generation circuit 30, a basic operation of a DC / DC converter 30a will be described.
- the DC / DC converter 30a When the input voltage VIN is inputted, the DC / DC converter 30a charges the energy by the inductor 31, opens the gate of the switching FET 32 at a cycle determined by the oscillation IC 33, and repeats ON / OFF of the boosting line from the input.
- the rectifier diode 34 rectifies the current so as to flow in one direction, obtains a stable voltage by the smoothing capacitor 35, and outputs it as the output voltage VOUT.
- the output voltage is constantly monitored to prevent the output voltage from becoming higher than the expected voltage, and the divided value of the output voltage is oscillated as a feedback (F / B) voltage determined by the resistor 36 and the resistor 37.
- IC33 F / B detection Divider in FIG. 2
- monitor output voltage value with error amplifier present in oscillation IC33 monitor output voltage value with error amplifier present in oscillation IC33, and when output voltage becomes high, output voltage becomes low and output voltage becomes low In such a case, the circuit configuration is adjusted so as to be high
- a strong magnetic field (not limited to a numerical value) exceeding several mT (millitesla) is applied from a part other than the components constituting the DC / DC converter 30a (external to the DC / DC converter) (
- the inductor 31 used for the step-up switching and step-down switching of the DC / DC converter 30a is affected by the external magnetic field and tends to be saturated with magnetic flux. become.
- the inductance value of the inductor 31 decreases accordingly.
- the inductance value decreasing means that energy sufficient to generate the output voltage cannot be stored in the inductor 31 until the switching FET 32 is turned ON / OFF and the next ON / OFF driving is started. Insufficient energy can be maintained, causing a voltage drop, which causes the F / B circuit of the DC / DC converter 30a to recognize an abnormal state and operate the latch circuit. As a result, the display device 10 is stopped and no video is suddenly displayed on the screen.
- the switching operation can be connected by advancing the ON / OFF timing of the switching FET 32 so that the output voltage can be held. That is, it is only necessary to increase the oscillation frequency when a strong magnetic field is detected so that the output voltage can be maintained.
- the DC / DC converter 30a detects the strong magnetic field under detection.
- a circuit 38 and a strong magnetic field latch operation avoidance circuit that controls the DC / DC converter 30a so as not to enter the latch operation when it is detected that the magnetic field is strong magnetic field are provided.
- the strong magnetic field latch operation avoidance circuit when a signal output when the strong magnetic field detection circuit 38 detects a magnetic field exceeding a threshold value is input, sets the frequency for ON / OFF control of the switching FET 32. Control to increase.
- the strong magnetic field detection circuit 38 can be configured using a component that switches output logic (Hi or Low) in response to the strength of the surrounding magnetic field, for example, a Hall element (Hall IC). Further, the latch operation avoidance circuit under the strong magnetic field can be configured using an oscillation frequency control circuit 39a that controls the oscillation frequency of the DC / DC converter 30a by the output logic (Hi or Low) of the Hall IC.
- a component that switches output logic (Hi or Low) in response to the strength of the surrounding magnetic field for example, a Hall element (Hall IC).
- the latch operation avoidance circuit under the strong magnetic field can be configured using an oscillation frequency control circuit 39a that controls the oscillation frequency of the DC / DC converter 30a by the output logic (Hi or Low) of the Hall IC.
- the Hall IC may be either a digital output type or an analog output type (linear Hall IC, etc.), and the type of Hall IC is not limited. However, a linear Hall IC that can be controlled with an analog value is more suitable for realizing a fast operation. Further, the detection of the magnetic field is not limited to the Hall IC, and any device or component that detects the strength of the magnetic field and switches the output logic state depending on the strength may be used.
- the operation when the strong magnetic field detection circuit 38 and the oscillation frequency control circuit 39a are mounted will be described.
- the Hi level is output in an environment where there is no external magnetic field or very small, and the Hall IC operates and outputs the Low level when placed under a strong magnetic field exceeding a certain threshold. It is assumed that The oscillation frequency control circuit 39a determines the output level of the Hall IC. If the output level is Hi level, the switching FET 32 is driven at the oscillation frequency f0 (kHz) during normal driving. Switch to a frequency fm that satisfies 1.
- the value of fmax needs to be a value smaller than the reciprocal of the sum of the turn-on time (Ton) and the turn-off time (Toff) of the FET when driving the switching FET 32, as shown in Equation 2 below. is there.
- the reason is that when the switching FET 32 is driven, even if it is driven at a frequency exceeding the reciprocal of the sum of the turn-on time and the turn-off time of the FET, the switching FET 32 is driven in a region where the ON / OFF reaction is not sufficiently performed. This is because the normal switching operation is not performed.
- the output logic of the Hall IC (the strong electromagnetic wave in FIG. 3B).
- the lower detection circuit output V (v)) is at the Hi level, and the oscillation frequency control circuit 39a drives the switching FET 32 of the DC / DC converter 30a ON / OFF at the oscillation frequency f0 (see FIG. 3C). ), The switching FET 32 is normally driven (see FIG. 3D).
- the DC / DC converter 30a when the DC / DC converter 30a is placed under a strong magnetic field (here, when the magnetic flux density B (T) in FIG. 3A exceeds the threshold value (Bth) of the Hall element), it is under a strong magnetic field.
- An external magnetic field is detected by the detection circuit 38, and the oscillation frequency control circuit 39a increases the value of the oscillation frequency (f (kHz) in FIG. 3C) for driving the switching FET 32 to ON / OFF to be fm. Then, increase the number of ON / OFF times of the switching FET 32 (see the waveform of V (v) in FIG. 3D).
- a decrease in output voltage due to a decrease in the inductance value of the inductor 31 affected by the external magnetic field is prevented, and the operation of the latch circuit is avoided.
- the strong magnetic field detection circuit 38 and the oscillation frequency control circuit 39a are provided in the DC / DC converter 30a.
- the oscillation frequency control circuit 39a is switched.
- the oscillation frequency for driving the FET 32 By changing the oscillation frequency for driving the FET 32 to fm which is larger than f0 during normal driving and smaller than the reciprocal of the sum of the turn-on time and the turn-off time, the output voltage can be prevented from decreasing. Even when the DC / DC converter 30a is placed in a strong magnetic field, the output is not stopped, and the display device 10 can be prevented from shutting down suddenly.
- the switching FET 32 is driven at a constantly high oscillation frequency, a switching loss (decrease in efficiency of the DC / DC converter 30a) occurs due to an increase in the number of times of switching. Therefore, only in a necessary minimum period, that is, only in a strong magnetic field.
- the efficient DC / DC converter 30a can be realized by returning to the oscillation frequency of normal driving.
- the Hall IC outputs a Hi output when there is no external magnetic field, and outputs a Low output under a strong magnetic field.
- an open drain type of Hall IC may be used.
- FIG. 4 is a block diagram showing the configuration of the DC / DC converter of this embodiment
- FIGS. 5 (a) to 5 (d) are diagrams showing an inductance control operation in the DC / DC converter.
- the oscillation frequency control circuit 39a is used as a latch operation avoidance circuit under a strong magnetic field, and the oscillation frequency for driving the switching FET 32 under a strong magnetic field is increased, resulting in a decrease in the inductance value of the inductor 31.
- the operation of the latch circuit is suppressed by controlling the inductance.
- the second switching element, the second inductor connected in series with the inductor 31 when the second switching element is ON or OFF, and the second switching element are ON / OFF controlled.
- the inductor 31 and the second inductor are connected in series. Control to increase the inductance value by connecting.
- the configuration in that case is as shown in FIG. 4.
- the DC / DC converter 30 b includes a strong magnetic field detection circuit 38 that detects a strong magnetic field, and the DC / DC converter step-up (step-down) depending on the output state of the Hall IC.
- An inductance control circuit 39b (a strong magnetic field latch operation avoidance circuit) for changing the inductance value used in the line is provided.
- the inductance control circuit 39b includes an inductor L1 and circuit elements (such as a transistor, a switching FET, and a resistor) that control whether to connect the inductor L1 according to the output of the Hall IC.
- the basic configuration of the display device 10 and the DC / DC converter is the same as that of the first embodiment.
- the configuration of the detection circuit 38 under the strong magnetic field is the same as that of the first embodiment, and the Hall IC may be a digital output type or an analog output type (linear Hall IC, etc.), and the types of Hall ICs are limited. Not. However, a linear Hall IC that can be controlled with an analog value is more suitable for realizing a fast operation. Further, the detection of the magnetic field is not limited to the Hall IC, and any device or component that detects the strength of the magnetic field and switches the output logic state depending on the strength may be used.
- the Hi IC is output in an environment where there is no external magnetic field or is very small, and the Hall IC is placed under a strong magnetic field exceeding a certain threshold value.
- the specification is to operate and output a low level.
- the inductance control circuit 39b determines the output level of the Hall IC. If it is at the Hi level, the inductance control circuit 39b is driven using only the inductor L0 during normal driving. If it is at the Low level, the inductance control circuit 39b adds the inductor L1 to the inductor L0.
- the DC converter 30b is driven.
- the output logic of the Hall IC (the strong electromagnetic wave in FIG. 5B).
- the lower detection circuit output V (v)) is at the Hi level, and the transistor (Tr) connected to the output terminal of the Hall IC is turned on.
- FET0 is turned ON by the potential divided by the resistances of R3 and R4, and no current flows through the inductance of L1, so the DC / DC converter 30b is driven only by the inductor 31 of L0 (FIG. 5 (c) L ( ⁇ H), see FIG. 5 (d) I (A)).
- the strong magnetic field is used.
- the lower detection circuit 38 detects an external magnetic field, the output logic of the Hall IC becomes Low level, and Tr connected to the output terminal of the Hall IC is turned off.
- the potential applied to R3 and R4 becomes the same potential, and FET0 is turned off, so that the DC / DC converter 30b is driven by adding L0 and L1 (L in FIG. 5C). ( ⁇ H), see I (A) in FIG.
- the inductor 31 for driving the DC / DC converter 30b is driven by L0 + L1 rather than being driven by only L0, the inductance value is larger, so that sufficient energy can be stored to hold the output voltage. Therefore, it is possible to prevent the output voltage from being lowered and to prevent the latch circuit from operating.
- Equation 3 it is preferable to consider a constant in advance so that the reduced inductance value corresponds to the inductance value in the normal state.
- the strong magnetic field detection circuit 38 and the inductance control circuit 39b are provided in the DC / DC converter 30a, and when the strong magnetic field detection circuit 38 detects a magnetic field exceeding the threshold, the inductor of the inductance control circuit 39b adds. As a result, the inductance value is increased and the output voltage can be prevented from being lowered. Therefore, even when the DC / DC converter 30a is placed in a strong magnetic field, the output is not stopped and the display device 10 is suddenly shut down. It can be avoided.
- FIG. 6 is a block diagram showing the configuration of the DC / DC converter of the present embodiment
- FIGS. 7A to 7D are diagrams showing the control operation of the F / B voltage in the DC / DC converter. .
- the operation of the latch circuit due to a decrease in the inductance value of the inductor 31 is suppressed by increasing the oscillation frequency for driving the switching FET 32 under a strong magnetic field.
- the operation of the latch circuit is suppressed by increasing the inductance value under a magnetic field
- the operation of the latch circuit is suppressed by controlling the F / B voltage.
- an F / B voltage control circuit including a resistor having one end connected to the output path of the F / B voltage and a transistor connected between the other end of the resistor and the ground is provided.
- the configuration in that case is as shown in FIG. 6.
- the DC / DC converter 30 c includes a strong magnetic field detection circuit 38 that detects a strong magnetic field, and an output voltage generation of the DC / DC converter 30 c depending on the output state of the Hall IC.
- An F / B voltage control circuit 39c (a latching operation avoidance circuit under a strong magnetic field) for changing the operation is provided.
- the F / B voltage control circuit 39c includes a resistor R3 and a circuit element (such as a transistor) that controls connection / disconnection of the resistor R3 according to the output of the Hall IC.
- the basic configurations of the display device 10 and the DC / DC converter are the same as those in the first and second embodiments.
- the configuration of the detection circuit 38 under the strong magnetic field is the same as that of the first and second embodiments, and the Hall IC may be a digital output type or an analog output type (linear Hall IC, etc.).
- the type is not limited. However, a linear Hall IC that can be controlled with an analog value is more suitable for realizing a fast operation.
- the detection of the magnetic field is not limited to the Hall IC, and any device or component that detects the strength of the magnetic field and switches the output logic state depending on the strength may be used.
- the F / B voltage will be described.
- the following equation 4 is obtained as a voltage value (Vf / b) obtained by dividing the output voltage VOUT by the resistances R1 and R2, and a constant output voltage is obtained by inputting this voltage value to the F / B terminal of the oscillation IC 33. A value will be obtained.
- the F / B voltage is determined by the oscillation IC 33 so as to be always a constant voltage value (Vf / bic), and thereby the output voltage value is adjusted. Become.
- Vf / b VOUT ⁇ (R2) / (R1 + R2) ...
- VOUT Vf / bic ⁇ (1+ (R1 ⁇ ((1 / R2) + (1 / R3))))) Equation 8
- the value of VOUT obtained by Expression 8 is set under the environment where there is no external magnetic field (here, the magnetic flux density B (T) in FIG. 7 (a)). This is set as the output voltage value (V (v) in FIG. 7D) at the case where the threshold value (Bth) of the Hall element is not exceeded.
- the Hall IC detects this and sets the Low level.
- the Tr connected to the output terminal of the Hall IC is turned off. That is, R3 becomes invalid, and only R2 is related to the F / B voltage (see R ( ⁇ ) in FIG. 7C), so the output voltage is expressed by the following Expression 9.
- VOUTm Vf / bic ⁇ (1+ (R1 ⁇ (1 / R2))) Equation 9
- VOUTm Output voltage value when the DC / DC converter is placed in a strong magnetic field
- VOUT and VOUTm are compared, since VOUT> VOUTm, it can be seen that the output voltage under a strong magnetic field is smaller than when there is no external magnetic field (see V (v) in FIG. 7D). ).
- the current value of the boost line of the DC / DC converter 30c can be reduced, and control can be performed so as not to exceed the shutdown threshold current of the DC / DC converter 30c. Therefore, even when the display device equipped with the F / B voltage control circuit 39c of the present embodiment is placed in a strong magnetic field, the problem that the DC / DC converter 30c shuts down and the display device suddenly disappears can be avoided. it can.
- the Hall IC is designed to output Hi when there is no external magnetic field, and Low output under a strong magnetic field, but it outputs Hi-Z (OPEN) when there is no external magnetic field, and Low output under a strong magnetic field. Since the Tr connected to the output terminal of the Hall IC is not required (the Hall IC and one resistor can be used to configure the strong magnetic field detection circuit 38 and the F / B voltage control circuit 39c). Can be reduced.
- the present invention is not limited to the above-described embodiments, and the configuration and control thereof can be changed as appropriate without departing from the spirit of the present invention.
- the step-up DC / DC converter has been described.
- the present invention can be similarly applied to a step-down DC / DC converter.
- the present invention is applicable to a DC / DC converter, in particular, a DC / DC converter used under a strong magnetic field and a display device using the DC / DC converter as a power generation circuit.
- Display apparatus 20 Power supply source 30 Power supply generation circuit 30a, 30b, 30c DC / DC converter 31 Inductor 32 Switching FET 33 Oscillation IC 34 Rectifier diode 35 Smoothing capacitor 36, 37 Resistance 38 Under strong magnetic field detection circuit 39 Under strong magnetic field latch operation avoidance circuit 39a Oscillation frequency control circuit 39b Inductance control circuit 39c F / B voltage control circuit 40 Video signal supply source 50 Video signal processing circuit 60 Display Device Driver 70 Display Device Scan Driver 80 Video Display Unit
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Abstract
Description
~:ニアリーイコール
L0:外部磁界が無い場合のインダクタL0のインダクタンス値
L0m:強磁界下でのインダクタL0のインダクタンス値
L1m:強磁界下でのインダクタL1のインダクタンス値
VOUT=(R1+R2)×If/b … 式6
VOUT=Vf/bic×(R1+R2)/R2=Vf/bic×(1+(R1/R2)) … 式7
VOUTm:DC/DCコンバータが強磁界下に置かれた場合の出力電圧値
20 電源供給源
30 電源生成回路
30a、30b、30c DC/DCコンバータ
31 インダクタ
32 スイッチングFET
33 発振IC
34 整流ダイオード
35 平滑コンデンサ
36、37 抵抗
38 強磁界下検出回路
39 強磁界下ラッチ動作回避回路
39a 発振周波数制御回路
39b インダクタンス制御回路
39c F/B電圧制御回路
40 映像信号供給源
50 映像信号処理回路
60 表示装置駆動ドライバ
70 表示装置走査用ドライバ
80 映像表示部
Claims (8)
- 入力端子に一端が接続されたインダクタと、前記インダクタの他端と接地との間に接続されたスイッチング素子と、前記インダクタの他端と出力端子との間に接続されたダイオードと、前記出力端子と接地との間に接続されたコンデンサと、前記出力端子と接地との間に接続され、出力電圧を分圧したフィードバック電圧を出力するフィードバック回路と、前記フィードバック電圧が入力され、前記フィードバック電圧に応じた周波数で前記スイッチング素子をON/OFF制御する発振回路と、を備えるDC/DCコンバータにおいて、
外部磁界を検出し、検出した磁界が予め定めた閾値を超えるか否かに応じて異なる信号を出力する検出回路と、
前記信号が入力され、前記信号に応じて前記DC/DCコンバータを制御することにより、強磁界下における前記DC/DCコンバータの過電流を抑制する制御回路と、を備える、
ことを特徴とするDC/DCコンバータ。 - 前記制御回路は、前記検出回路が前記閾値を超える磁界を検出したときに出力される信号が入力されたら、前記スイッチング素子をON/OFF制御する周波数を高くする制御を行う、
ことを特徴とする請求項1に記載のDC/DCコンバータ。 - 外部磁界が無い又は非常に小さい場合の前記スイッチング素子を駆動する周波数をf0、前記スイッチング素子のターンON時間をTon、ターンOFF時間をToffとした場合、
前記制御回路は、前記スイッチング素子をON/OFF制御する周波数fmが、
f0<fm<1/(Ton+Toff)
を満たすように制御する、
ことを特徴とする請求項2に記載のDC/DCコンバータ。 - 前記制御回路は、第2のスイッチング素子と、前記第2のスイッチング素子がON又はOFFの時に前記インダクタに直列に接続される第2のインダクタと、前記第2のスイッチング素子をON/OFF制御するトランジスタと、を含み、前記検出回路が前記閾値を超える磁界を検出したときに出力される信号が前記トランジスタに入力されたら、前記インダクタと前記第2のインダクタとを直列に接続して、インダクタンス値を高くする制御を行う、
ことを特徴とする請求項1に記載のDC/DCコンバータ。 - 外部磁界が無い又は非常に小さい場合の前記インダクタのインダクタンス値をL0、外部磁界が前記閾値を超える場合の前記インダクタのインダクタンス値と前記第2のインダクタのインダクタンス値との総和値をLmとした場合、前記第2のインダクタは、L0とLmとが略等しくなるように設定される、
ことを特徴とする請求項4に記載のDC/DCコンバータ。 - 前記制御回路は、前記フィードバック電圧の出力経路に一端が接続される抵抗と、前記抵抗の他端と接地との間に接続されるトランジスタと、を含み、前記検出回路が前記閾値を超える磁界を検出したときに出力される信号が前記トランジスタに入力されたら、前記抵抗を無効にして、前記DC/DCコンバータの出力電圧を低くする制御を行う、
ことを特徴とする請求項1に記載のDC/DCコンバータ。 - 前記フィードバック回路の分圧用の抵抗をR1、R2、前記制御回路の抵抗をR3、外部磁界が無い又は非常に小さい場合の前記DC/DCコンバータの出力電圧をVOUT、外部磁界が前記閾値を超える場合の前記DC/DCコンバータの出力電圧をVOUTm、前記フィードバック電圧の設定値をVf/bicとした場合、
VOUT=Vf/bic×(1+(R1×((1/R2)+(1/R3))))
VOUTm=Vf/bic×(1+(R1×(1/R2)))
で表され、
前記制御回路は、
VOUTm<VOUT
を満たすように制御する、
ことを特徴とする請求項6に記載のDC/DCコンバータ。 - 請求項1乃至7のいずれか一に記載のDC/DCコンバータを備える、
ことを特徴とする表示装置。
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CN105896984B (zh) * | 2016-06-21 | 2018-06-29 | 清华大学 | Boost电路及DC-DC模块,刺激电路和植入式医疗器械 |
US10560993B1 (en) | 2018-03-08 | 2020-02-11 | Universal Lighting Technologies, Inc. | Dimming controller for LED driver and method of indirect power estimation |
CN111478583B (zh) * | 2020-04-24 | 2021-04-20 | 无锡芯朋微电子股份有限公司 | 开关电源控制电路及应用该电路的开关电源控制方法 |
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