WO2024009685A1 - Dispositif d'alimentation électrique à commutation et son procédé de commande - Google Patents

Dispositif d'alimentation électrique à commutation et son procédé de commande Download PDF

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WO2024009685A1
WO2024009685A1 PCT/JP2023/021403 JP2023021403W WO2024009685A1 WO 2024009685 A1 WO2024009685 A1 WO 2024009685A1 JP 2023021403 W JP2023021403 W JP 2023021403W WO 2024009685 A1 WO2024009685 A1 WO 2024009685A1
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signal
control pulse
pulse
power supply
switching power
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PCT/JP2023/021403
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English (en)
Japanese (ja)
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一宏 堀井
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ローム株式会社
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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
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac

Definitions

  • the present disclosure relates to a switching power supply device.
  • Electronic equipment, industrial equipment, industrial machinery, and automobiles are equipped with switching power supply devices that convert the voltage from the main power source into a power supply voltage suitable for the circuit.
  • a switching power supply device includes an error amplifier that amplifies the error between an output detection signal indicating an output signal and a reference signal, a pulse modulator that converts the error signal that is the output of the error amplifier into a pulse modulation signal, and a pulse modulator that converts the error signal that is the output of the error amplifier into a pulse modulation signal.
  • a driver that drives a switching element of the switching power supply device according to the modulation signal.
  • the present disclosure has been made under such circumstances, and one exemplary objective of a certain aspect thereof is to provide a switching power supply device that can change the target level of an output signal.
  • a switching power supply device includes a power circuit including a switching element, a control pulse generator that generates a control pulse having a duty cycle according to a target value of an output signal of the power circuit, and an output signal of the power circuit. and a converter controller that generates a drive pulse and drives the switching element in accordance with the drive pulse so that the error between the output detection signal indicating the reference signal and the reference signal approaches zero.
  • the control pulse is superimposed on the output detection signal or reference signal.
  • the frequency of the control pulses is higher than the crossover frequency of the converter controller.
  • Another aspect of the present disclosure is a method of controlling a switching power supply device including a switching element.
  • the control method includes the steps of generating a control pulse having a duty cycle according to a target value of the output signal of the switching power supply, and superimposing the control pulse on an output detection signal indicating the output signal of the switching power supply to generate a feedback signal. generating a drive pulse using a feedback controller so that an error between the feedback signal and the reference signal approaches zero; and driving a switching element in accordance with the drive pulse.
  • the frequency of the control pulses is higher than the crossover frequency of the feedback controller.
  • the target level of the output signal of the switching power supply device can be digitally controlled.
  • FIG. 1 is a block diagram of a circuit system including a switching power supply device according to an embodiment.
  • FIG. 2 is a block diagram of a switching power supply device including a converter controller according to one embodiment.
  • FIG. 3 is a block diagram of the switching power supply device according to the first embodiment.
  • FIG. 4 is a block diagram of a switching power supply device according to the second embodiment.
  • FIG. 5 is a block diagram of a switching power supply device according to the third embodiment.
  • FIG. 6 is a block diagram of a switching power supply device according to the fourth embodiment.
  • FIG. 7 is a block diagram of a switching power supply device according to modification example 1.
  • a switching power supply device includes a power circuit including a switching element, a control pulse generator that generates a control pulse having a duty cycle according to a target value of an output signal of the power circuit, and a control pulse generator that generates a control pulse having a duty cycle according to a target value of an output signal of the power circuit. and a converter controller that generates drive pulses and drives the switching elements in accordance with the drive pulses so that the error between the output detection signal shown and the reference signal approaches zero.
  • the control pulse is superimposed on the output detection signal or reference signal.
  • the frequency of the control pulses is higher than the crossover frequency of the converter controller.
  • the signal level of one of the output detection signal and the reference signal on which the control pulse is superimposed can be controlled according to the duty cycle of the control pulse. Therefore, by changing the duty cycle of the control pulse, the level of the output signal of the switching power supply device can be changed.
  • the signal level of one of the output detection signal or the reference signal on which the control pulse is superimposed pulsates according to the control pulse, but since the frequency of the control pulse is higher than the crossover frequency of the converter controller, Pulsations due to control pulses do not affect the feedback loop.
  • This configuration has the advantage of not requiring a low-pass filter to remove pulsations.
  • the power circuit may be an isolated converter.
  • the control pulse generator may be provided on the primary side of the isolated converter.
  • the converter controller may be provided across the primary side and secondary side of the isolated converter.
  • the switching power supply device may further include an isolation circuit provided on a control pulse transmission path from the control pulse generator to the secondary block of the converter controller. Control pulses can be easily transmitted by isolated elements such as optocouplers, pulse transformers, and isolated gate drivers. Further, even when the control resolution is high, the number of insulation elements may be one.
  • the drive pulse and control pulse may be pulse width modulated signals.
  • the frequency of the drive pulse may be equal to the frequency of the control pulse. This makes it possible to suppress output fluctuations due to beats.
  • control pulse generator includes a counter that receives a target value of the output signal of the power circuit and a set value of the frequency of the control pulse, and generates the control pulse by counting the clock signal. It may be possible to generate a synchronization signal that is asserted every pulse period.
  • the converter controller may include a pulse width modulator that generates the drive pulses in synchronization with the synchronization signal.
  • the drive pulse and control pulse may be pulse width modulated signals.
  • the frequency of the drive pulse may be m times or 1/m times the frequency of the control pulse. This makes it possible to suppress output fluctuations due to beats.
  • control pulse generator includes a first counter that receives a target value of the output signal of the power circuit and a set value of the frequency of the control pulse, and generates the control pulse by counting the clock signal. But that's fine.
  • the switching power supply device may further include a second counter that receives the setting value of the switching frequency and generates the synchronization signal by counting the clock signal.
  • the converter controller may include a pulse width modulator that generates drive pulses in synchronization with the synchronization signal.
  • the converter controller includes an error amplifier receiving a reference signal at a first input, a first resistor connected at a first end to a second input of the error amplifier and receiving an output detection signal at a second end; a second resistor connected at one end to a second input of the error amplifier and receiving a control pulse at a second end; and a pulse modulator that generates a pulse modulation signal having a duty cycle according to the error signal that is the output of the error amplifier. It may also include.
  • the converter controller may further include a third resistor whose first end is connected to the second input of the error amplifier and whose second end is grounded. The voltage level of the second input of the error amplifier can be adjusted by the resistance value of the third resistor.
  • the converter controller includes an error amplifier receiving an output detection signal at a first input, a first resistor connected at a first end to a second input of the error amplifier and receiving a reference signal at a second end; a second resistor connected at one end to a second input of the error amplifier and receiving a control pulse at a second end; and a pulse modulator that generates a pulse modulation signal having a duty cycle according to the error signal that is the output of the error amplifier. It may also include.
  • a state in which member A is connected to member B refers to not only a case where member A and member B are physically directly connected, but also a state in which member A and member B are electrically connected. This also includes cases in which they are indirectly connected via other members that do not substantially affect the connection state or impair the functions and effects achieved by their combination.
  • a state in which member C is connected (provided) between member A and member B refers to a state in which member A and member C or member B and member C are directly connected. In addition, it also includes cases where they are indirectly connected via other members that do not substantially affect their electrical connection state or impair the functions and effects achieved by their combination.
  • FIG. 1 is a block diagram of a circuit system 1 including a switching power supply device 100 according to an embodiment.
  • the circuit system 1 includes an input power supply 2, a load 4, a host controller 6, and a switching power supply 100.
  • the switching power supply device 100 receives an input voltage V IN from the input power supply 2 on an input line (input terminal) 102 .
  • a load 4 is connected to an output line (output terminal) 104 of the switching power supply device 100 .
  • Switching power supply device 100 receives power from input power supply 2 and supplies power to load 4 .
  • the switching power supply device 100 may output a constant voltage or a constant current, but in this embodiment, it outputs a constant voltage and is stabilized at a predetermined target level V OUT (REF).
  • the output voltage V OUT is supplied to the load 4. In this embodiment, the output voltage V OUT of the switching power supply device 100 can be digitally controlled.
  • the switching power supply device 100 includes a power circuit 110, a control pulse generator 130, a converter controller 150, and a digital processor 200. Note that each block shown in FIG. 1 represents a function or process implemented in the switching power supply device 100, and does not necessarily represent a hardware unit or configuration.
  • Digital processor 200 integrally controls switching power supply 100 .
  • Digital processor 200 is capable of communicating with external host controller 6 .
  • digital processor 200 receives control data from host controller 6 that indicates a target level V OUT (REF) of output voltage V OUT of switching power supply 100 .
  • REF target level V OUT
  • the power circuit 110 is the main circuit of the switching power supply, and includes at least one switching element M1, an inductive element such as a transformer or a coil (not shown), a rectifier circuit (not shown), and a smoothing capacitor (not shown).
  • the configuration and topology of the power circuit 110 are not particularly limited, and may be insulated or non-insulated.
  • the power circuit 110 is exemplified by a forward converter, a flyback converter, a half-bridge converter, a full-bridge converter, and the like.
  • the power circuit 110 may have a topology including an inductor (reactor) instead of a transformer, such as a buck converter, a boost converter, a buck-boost converter, a Cuk converter, or a SEPIC. It may also be a converter.
  • Digital processor 200 outputs a set value D SET of target level V OUT (REF) of output voltage V OUT to control pulse generator 130 .
  • the control pulse generator 130 generates control pulses V CTRL having a duty cycle according to the digital setpoint D SET . That is, the control pulse V CTRL has a duty cycle depending on the target level V OUT (REF) .
  • Duty cycle is the ratio of the on level (e.g. high) to the period, and the control pulse V CTRL may be a pulse width modulation (PWM) signal or a pulse frequency modulation (PFM) signal. good.
  • PWM pulse width modulation
  • PFM pulse frequency modulation
  • the period is constant, and the on time varies depending on the digital signal D_SET .
  • the on time is constant, and the frequency (period) changes depending on the digital signal D SET .
  • Converter controller 150 receives control pulses V CTRL . Further, an output detection signal V DET indicating the output voltage V OUT of the power circuit 110 is fed back to the converter controller 150 .
  • the output detection signal V DET may be the output voltage V OUT or may be a voltage obtained by dividing the output voltage V OUT using a resistor or a transformer.
  • Converter controller 150 includes a pulse modulator that generates a drive pulse V DRV so that the error between output detection signal V DET and reference signal V REF approaches zero, and drives switching element M1 in accordance with drive pulse V DRV . .
  • control pulse V CTRL is superimposed on output detection signal V DET or reference signal V REF .
  • the control pulse V CTRL is superimposed on the output detection signal V DET
  • the feedback loop is configured such that the output detection signal (feedback signal V FB ) on which the control pulse V CTRL is superimposed approaches the reference signal VREF . configured.
  • f 0 be the crossover frequency of the feedback loop of converter controller 150, that is, the frequency at which the closed loop gain is 0 dB.
  • the following relationship holds between the frequency f CTRL of the control pulse V CTRL and the crossover frequency f 0 . f 0 ⁇ f CTRL
  • the above is the basic configuration of the switching power supply device 100.
  • FIG. 2 is a block diagram of a switching power supply device 100A including a converter controller 150A according to an embodiment.
  • the control pulse V CTRL is superimposed on the output detection signal V DET .
  • the converter controller 150A includes a first resistor R11 to a third resistor R13, an error amplifier 152, a pulse modulator 154, and a driver 156.
  • the error amplifier 152 receives a reference signal V REF at a first input (non-inverting input terminal +).
  • the first end of the first resistor R11 is connected to the second input (inverting input terminal -) of the error amplifier 152, and the output detection signal V DET is input to the second end of the first resistor R11.
  • a first end of the second resistor R12 is connected to a second input (-) of the error amplifier 152, and a control pulse V CTRL is input to the second end of the second resistor R12.
  • the first end of the third resistor R13 is connected to the second input (-) of the error amplifier 152, and the second end of the third resistor R13 is grounded.
  • the error amplifier 152 amplifies the error between the reference signal V REF at the first input (+) and the feedback signal V FB generated at the second input (-).
  • Pulse modulator 154 generates a pulse modulated signal V MOD having a duty cycle responsive to error signal V ERR that is the output of error amplifier 152 .
  • Pulse modulator 154 may be a pulse width modulator or a pulse frequency modulator.
  • the driver 156 supplies a drive signal V DRV according to the pulse modulation signal V MOD to the gate of the switching element M1.
  • the above is the configuration of the switching power supply device 100A.
  • the feedback loop including the error amplifier 152 causes the error between the feedback signal V FB and the reference signal V REF to be zero, in other words, the feedback signal V FB approaches the reference signal V REF . , it takes feedback.
  • the feedback signal VFB will be explained.
  • the error amplifier 152, the first resistor R11, the second resistor R12, and the third resistor R13 constitute a summing amplifier, and the feedback signal VFB , which is the output thereof, is expressed by equation (1).
  • the feedback signal V FB pulsates in response to the control pulse V CTRL .
  • the frequency of the pulsation is f CTRL , which is higher than the crossover frequency f 0 of the converter controller 150A, so the pulsation does not affect the feedback control.
  • feedback is applied so that the average voltage V FB (AVE) of the feedback voltage V FB approaches the reference signal V REF .
  • equation (4) is obtained.
  • V FB (AVE) V REF holds true, and the target level V DET (REF) of the output detection signal V DET is expressed by equation (5). Therefore, by changing the duty cycle d, it is possible to change the output detection signal V DET and thus the target level of the output voltage V OUT .
  • V L 0V
  • V DET the target level
  • the advantages of the switching power supply device 100A will be explained.
  • the advantages of the switching power supply device 100A become clear when compared with comparative technologies.
  • Comparative technology 1 In comparative technique 1, a D/A converter is provided in place of the control pulse generator 130. The D/A converter converts the set value D SET of the target level V OUT (REF) into an analog voltage V SET . The rest is the same as in FIG. 2.
  • the switching power supply device 100A does not require a D/A converter, and therefore costs can be reduced.
  • the control pulse V CTRL is input to the converter controller 150 without passing through the low-pass filter. Therefore, after changing the set value D SET , the target level V OUT (REF) of the output voltage V OUT changes immediately, and the target level V OUT (REF) can be controlled at high speed.
  • the third resistor R13 may be omitted.
  • the present disclosure covers various devices and methods that can be understood as the block diagrams and circuit diagrams in FIG. 1 or 2, or derived from the above description, and is not limited to a specific configuration. More specific configuration examples and examples will be described below, not to narrow the scope of the present disclosure, but to help understand and clarify the essence and operation of the present disclosure and the present invention.
  • FIG. 3 is a block diagram of the switching power supply device 100B according to the first embodiment.
  • Switching power supply device 100B is an isolated converter.
  • the power circuit 110B is a forward converter and includes a transformer T1, a switching element M1, rectifying elements D1 and D2, an output choke coil L0, and an output capacitor C0.
  • Switching element M1 is connected to primary winding W1 of transformer T1. Rectifying elements D1 and D2, output choke coil L0, and output capacitor C0 are connected to secondary winding W2.
  • the converter controller 150B includes a photocoupler 158 in addition to an error amplifier 152, a pulse modulator 154, a driver 156, and first to third resistors R11 to R13.
  • the error amplifier 152 and the first to third resistors R11 to R13 are arranged on the secondary side.
  • the error amplifier 152 is a shunt regulator, and supplies an error signal I ERR corresponding to the error between the feedback signal V FB and the reference voltage V REF to the light emitting element (photodiode) of the photo coupler 158 .
  • the pulse modulator 154 converts the current flowing through the light receiving element (phototransistor) of the photocoupler 158 into a voltage signal, and generates a pulse modulation signal V MOD having a duty cycle according to this voltage signal.
  • An isolation circuit 132 is provided on the transmission path of the control pulse V CTRL between the control pulse generator 130 and the converter controller 150B.
  • the insulating circuit 132 is composed of insulating elements such as a photocoupler, a pulse transformer, and an insulated gate driver.
  • the above is the configuration of the switching power supply device 100B.
  • the target level of the output voltage V OUT can be controlled at high speed even in an isolated converter.
  • Comparison technique 3 is a modification of comparison technique 1 to an isolated converter.
  • the D/A converter is placed on the secondary side.
  • An insulating circuit is required to transmit the setting data D SET from the primary side to the secondary side, but parallel transmission is required to transmit the setting data D SET at high speed. If the setting data D SET is 8 bits, eight insulating elements are required to transmit the 8 bits, resulting in problems of increased cost and increased size of the device.
  • FIG. 4 is a block diagram of a switching power supply device 100C according to the second embodiment.
  • converter controller 150C includes a pulse width modulator 154C, and drive pulse V DRV is a pulse width modulated (PWM) signal.
  • PWM pulse width modulated
  • the configuration of the power circuit 110C is similar to the power circuit 110B in FIG. 3.
  • Control pulse V CTRL is also a pulse width modulated signal.
  • Control pulse generator 130 is a digital PWM circuit and includes a counter 136 that functions as a pulse width modulator and generates control pulses V CTRL having a predetermined frequency f CTRL .
  • a set value D SET of the output voltage V OUT and a set value F SET of the frequency f CTRL of the control pulse V CTRL are input to the counter 136 .
  • Counter 136 generates control pulse V CTRL by counting clock signal CLK generated by oscillator 134 . Specifically, the counter 136 counts up in accordance with the clock signal CLK, outputs a first level (for example, high) from the start of counting until the count value reaches the set value DSET , and then outputs the first level (for example, high). A second level (for example, low) is output until the value reaches the set value F SET . When the count value reaches the set value F SET , the counter 136 is reset and repeats the same operation.
  • the frequency of the drive pulse V DRV that is, the switching frequency of the switching power supply device 100C, is equal to the frequency of the control pulse V CTRL .
  • the control pulse generator 130 generates a synchronization signal V SYNC that is asserted every period (1/f CTRL ) of the control pulse V CTRL .
  • Synchronization signal V SYNC is provided to pulse width modulator 154C.
  • Pulse width modulator 154C generates pulse width modulated signal V PWM in synchronization with synchronization signal V SYNC .
  • pulse width modulator 154C includes an oscillator 162 and a PWM comparator 164.
  • the oscillator 162 generates a periodic signal V OSC having the same frequency f CTRL as the frequency of the control pulse V CTRL in synchronization with the synchronization signal V SYNC .
  • the periodic signal V OSC is a triangular wave or a sawtooth wave.
  • PWM comparator 164 compares periodic signal V OSC with error signal V ERR and generates PWM signal V PWM . With this configuration, the frequency of the PWM signal V PWM and the frequency of the control pulse V CTRL can be made equal.
  • the switching frequency of the power circuit 110C and the frequency of the control pulse V CTRL deviate, the output voltage V OUT will oscillate due to the beat.
  • the switching frequency and the frequency of the control pulse V CTRL it is possible to suppress vibrations in the output voltage due to beats.
  • FIG. 5 is a block diagram of a switching power supply device 100D according to the third embodiment.
  • both the control pulse V CTRL and the drive pulse V DRV are PWM signals.
  • the frequency of the control pulse V CTRL is set to be m times or 1/m times the frequency (switching frequency) of the drive pulse V DRV .
  • m is a natural number.
  • the power circuit 110D and converter controller 150D are similar to the power circuit 110C and converter controller 150C in FIG. 4.
  • Switching power supply device 100D includes a synchronization signal generator 140 in addition to switching power supply device 100C in FIG.
  • the synchronization signal generator 140 generates a synchronization signal V SYNC having a frequency that is m times or 1/m times the control pulse V CTRL generated by the control pulse generator 130 .
  • Synchronization signal generator 140 includes a counter 142 .
  • the counter 142 is supplied with a frequency setting value F SET2 that defines the frequency of the synchronization signal V SYNC , that is, the switching frequency of the switching element M1, from the digital processor 200.
  • the counter 142 counts up according to the clock signal CLK, and when the count value reaches a threshold value according to the frequency setting value F SET2 , it repeats the operation of asserting the synchronization signal V SYNC and resetting it.
  • FIG. 6 is a block diagram of a switching power supply device 100E according to the fourth embodiment.
  • An auxiliary winding L1 is connected to the output choke coil L0 of the power circuit 110E, and the voltage generated in the auxiliary winding L1 is supplied to the converter controller 150E as an output detection signal V DET .
  • the configuration of converter controller 150E is similar to converter controller 150A in FIG. 2. This configuration eliminates the need for photocoupler 158 in FIGS. 3-5.
  • FIG. 7 is a block diagram of a switching power supply device 100F according to modification example 1.
  • the control pulse V CTRL is superimposed on the reference signal V REF .
  • a feedback loop is configured such that the output detection signal V DET (feedback signal V FB ) approaches the reference signal V REF ′ obtained by superimposing the control pulse V CTRL on the reference signal V REF .
  • Converter controller 150F includes an error amplifier 152, a pulse modulator 154, a driver 156, a first resistor R21, and a second resistor R22.
  • a first input (+) of the error amplifier 152 is connected to a first resistor R21 and a second resistor R22.
  • the reference voltage V REF is input to the first resistor R21, and the control pulse V CTRL is input to the second resistor R22.
  • a feedback signal V FB (V DET ) is input to the second input of the error amplifier 152 .
  • V REF ′ A reference voltage V REF ′ obtained by superimposing a control pulse V CTRL on the reference voltage V REF appears at the first input of the error amplifier 152 .
  • V REF ' R21 ⁇ V CTRL +R22 ⁇ V REF /(R21+R22)
  • control pulse V CTRL changes at two voltage levels, but this is not the case.
  • the control pulse V CTRL may change between two states: a high impedance state HiZ and a predetermined voltage level V X.
  • the control pulse generator 130 or the isolation circuit 132 in FIG. 2 may have an open drain (open collector) output format, and the predetermined voltage level Vx in this case is 0V.
  • a power circuit including a switching element, a control pulse generator that generates a control pulse having a duty cycle according to a target value of the output signal of the power circuit; a converter controller that generates a drive pulse and drives the switching element in accordance with the drive pulse so that an error between an output detection signal indicating the output signal of the power circuit and a reference signal approaches zero; Equipped with The switching power supply device, wherein the control pulse is superimposed on the output detection signal or the reference signal, and the frequency of the control pulse is higher than a crossover frequency of the converter controller.
  • the power circuit is an isolated converter;
  • the control pulse generator is provided on the primary side of the isolated converter,
  • the converter controller is provided across the primary side and secondary side of the isolated converter,
  • the switching power supply device further comprising an insulation circuit provided on a transmission path of the control pulses from the control pulse generator to a block on the secondary side of the converter controller.
  • the drive pulse and the control pulse are pulse width modulated signals,
  • the switching power supply device according to item 1, wherein the frequency of the drive pulse is equal to the frequency of the control pulse.
  • the control pulse generator is a counter that receives the target value of the output signal of the power circuit and a set value of the frequency of the control pulse, and generates the control pulse by counting a clock signal, for each cycle of the control pulse; can generate a synchronization signal that is asserted,
  • the switching power supply device according to item 3, wherein the converter controller includes a pulse width modulator that generates the drive pulse in synchronization with the synchronization signal.
  • the drive pulse and the control pulse are pulse width modulated signals,
  • the switching power supply device according to item 1, wherein the frequency of the drive pulse is m times or 1/m times the frequency of the control pulse, where m is a natural number.
  • the control pulse generator is a first counter that receives the target value of the output signal of the power circuit and a set value of the frequency of the control pulse, and generates the control pulse by counting a clock signal;
  • the switching power supply device further includes a second counter that receives a set value of the switching frequency and generates a synchronization signal by counting the clock signal,
  • the converter controller includes a pulse width modulator that generates the drive pulse in synchronization with the synchronization signal.
  • the converter controller includes: an error amplifier receiving the reference signal at a first input; a first resistor whose first end is connected to a second input of the error amplifier and whose second end receives the output detection signal; a second resistor having a first end connected to the second input of the error amplifier and receiving the control pulse at a second end; a pulse modulator that generates a pulse modulation signal having a duty cycle according to the error signal that is the output of the error amplifier;
  • the switching power supply device according to any one of items 1 to 6, including:
  • the converter controller includes: The switching power supply device according to item 7, further comprising a third resistor whose first end is connected to the second input of the error amplifier and whose second end is grounded.
  • the converter controller includes: an error amplifier receiving the output detection signal at a first input; a first resistor having a first end connected to a second input of the error amplifier and receiving the reference signal at a second end; a second resistor having a first end connected to the second input of the error amplifier and receiving the control pulse at a second end; a pulse modulator that generates a pulse modulation signal having a duty cycle according to the error signal that is the output of the error amplifier;
  • the switching power supply device according to any one of items 1 to 6, including:
  • a method for controlling a switching power supply device including a switching element comprising: generating a control pulse having a duty cycle according to a target value of the output signal of the switching power supply; superimposing the control pulse on an output detection signal indicating the output signal of the switching power supply to generate a feedback signal; generating drive pulses by a feedback controller such that an error between the feedback signal and the reference signal approaches zero; driving the switching element according to the drive pulse; Equipped with The control method, wherein the frequency of the control pulse is higher than a crossover frequency of the feedback controller.
  • the present disclosure relates to a switching power supply device.
  • Input power supply 6 Host controller 4 Load 100 Switching power supply 102 Input line 104 Output line 110 Power circuit C0 Output capacitor D1, D2 Rectifying element L0 Output choke coil L1 Auxiliary winding M1 Switching element T1 Transformer W1 Primary winding W2 Secondary winding Line 130 Control pulse generator 132 Insulation circuit 136 Counter 140 Synchronous signal generator 142 Counter 150 Converter controller 152 Error amplifier 154 Pulse modulator 156 Driver 158 Photocoupler R11, R21 First resistor R12, R22 Second resistor R13 Third resistor 160 Primary side controller IC 162 Oscillator 164 PWM comparator 200 Digital processor

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Abstract

La présente invention concerne un circuit d'alimentation 110 qui comprend un élément de commutation M1. Un générateur d'impulsions de commande 130 génère une impulsion de commande VCTRL ayant un rapport cyclique conforme à une valeur cible VOUT(REF) d'un signal de sortie VOUT du circuit d'alimentation 110. Un dispositif de commande de convertisseur 150 génère une impulsion d'entraînement VDRV telle que la différence entre un signal de détection de sortie VDET indiquant le signal de sortie VOUT du circuit d'alimentation 110 et un signal de référence VREF s'approche de zéro. L'impulsion de commande VCTRL est superposée au signal de détection de sortie VDET ou au signal de référence VREF. La fréquence fCTRL de l'impulsion de commande VCTRL est supérieure à une fréquence de croisement f0 du dispositif de commande de convertisseur 150.
PCT/JP2023/021403 2022-07-04 2023-06-08 Dispositif d'alimentation électrique à commutation et son procédé de commande WO2024009685A1 (fr)

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JP2022108012 2022-07-04

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006049127A (ja) * 2004-08-05 2006-02-16 Koito Mfg Co Ltd 照明用光源の点灯装置
JP2009095091A (ja) * 2007-10-04 2009-04-30 Cosel Co Ltd スイッチング電源装置
JP2017055522A (ja) * 2015-09-08 2017-03-16 コーセル株式会社 電源装置及びその信号処理方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006049127A (ja) * 2004-08-05 2006-02-16 Koito Mfg Co Ltd 照明用光源の点灯装置
JP2009095091A (ja) * 2007-10-04 2009-04-30 Cosel Co Ltd スイッチング電源装置
JP2017055522A (ja) * 2015-09-08 2017-03-16 コーセル株式会社 電源装置及びその信号処理方法

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