WO2007088803A1 - スイッチング電源装置および電源制御用半導体集積回路 - Google Patents
スイッチング電源装置および電源制御用半導体集積回路 Download PDFInfo
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- WO2007088803A1 WO2007088803A1 PCT/JP2007/051365 JP2007051365W WO2007088803A1 WO 2007088803 A1 WO2007088803 A1 WO 2007088803A1 JP 2007051365 W JP2007051365 W JP 2007051365W WO 2007088803 A1 WO2007088803 A1 WO 2007088803A1
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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
- H02M3/325—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 using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—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 using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—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 using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
Definitions
- the present invention relates to an output voltage stabilization technique for a switching power supply device including a voltage conversion transformer, and is effective when used for a DC-DC converter used in a power conversion device such as an AC adapter. Regarding technology.
- An AC adapter is composed of a diode bridge circuit that rectifies an AC power supply, and a DC-DC converter that steps down the DC voltage rectified by the circuit and converts it to a DC voltage of a desired potential.
- a DC-DC converter for example, a switching power supply device is used which controls the voltage induced in the secondary side winding by switching control of the current flowing in the primary side winding of the voltage conversion transformer.
- the AC adapter has been reduced in size and cost. For this purpose, it is important to reduce the number of parts. Therefore, a control IC that controls a switching transistor that allows current to flow through the primary side wire has been developed.
- Conventional switching control ICs have a relatively large number of external elements such as photo power bras, capacitors, and resistors for feeding back the output voltage on the secondary winding side to the control IC. Circuit designs are being implemented to reduce the number of external elements incorporated into the IC.
- Fig. 5 shows the overall configuration of the switching regulator disclosed in Patent Document 1
- Fig. 6 shows the configuration example of the trigger control circuit that detects the terminal voltage of the primary auxiliary winding and gives sampling timing.
- Fig. 7 shows the waveforms of signals and voltages inside the regulator.
- the trigger control circuit in FIG. 6 is provided in the control IC 100 in FIG.
- the change in the voltage between the terminals of the auxiliary winding Nb (hereinafter referred to as the auxiliary winding voltage) Vb
- the switches CP1 and C2 detect and generate Vg and Vd signals. Based on these signals, switches that charge and discharge the capacitors C1 and C2 in the logic circuit consisting of flip-flops FF1 and FF2 and logic gates LG1 and LG2.
- a signal for controlling S1 to S4 is generated to detect the timing when the potentials of capacitors C1 and C2 become equal, and the sample and hold signal S & H is generated at this timing. As shown in FIG.
- the timing for generating the sample and hold signal S & H is a point Ps of about 2Z3 of the voltage duration Th of the auxiliary winding voltage Vb, and the secondary side diode Dr, that is, the secondary side Since the current is close to the point where the current Id force flowing in the shoreline becomes the timing, the control can be performed with relatively good accuracy.
- the current Id flowing from the secondary side winding Ns to the rectifying diode Dr gradually changes during the voltage duration Th of the auxiliary winding voltage Vb, as shown in FIG. . Therefore, the point Ps, which is about 2/3 of the voltage duration Th of the auxiliary winding voltage Vb, is close to the point where the current flowing through the diode becomes 0 but is not completely 0.
- diodes have relatively large variations in characteristics between elements.
- the output voltage Vout in the switching regulator of FIG. 5 is the forward voltage of the secondary side rectifier diode Dr, where NsZ Nb is the ratio between the secondary side and the primary side auxiliary Is VF, the following formula (1)
- Vout Vb (Ns / Nb) — VF (1)
- An object of the present invention is a switching power supply device including a voltage conversion transformer, which is a terminal voltage of an auxiliary wire at a timing very close to a point at which a current flowing through a rectifying diode on the secondary side becomes zero. It is an object of the present invention to provide a switching power supply device that can sample the output voltage and control the output voltage with high accuracy.
- Another object of the present invention is to enable accurate sampling with little error even when the output voltage fluctuates, thereby enabling high-accuracy output voltage control. It is to provide a power supply device.
- the present invention provides a voltage conversion transformer having an auxiliary winding on the primary side, a switching transistor connected to the primary side of the transformer, and the auxiliary winding.
- the switching control circuit that outputs a signal for controlling the on / off of the transistor in response to the terminal voltage of the transistor, the rectifying diode connected to the secondary side of the transformer, and the secondary side of the transformer.
- the switching control circuit includes a detection circuit that detects a fall of the terminal voltage of the auxiliary winding, and is provided at a detection timing of the detection circuit. Based on the terminal voltage of the auxiliary winding just before the current flowing through the rectifier diode becomes 0, the switching transistor is controlled. It is a thing.
- the detection circuit includes a differentiating circuit, and is configured to detect a falling edge of the terminal voltage of the auxiliary winding line by the differentiating circuit.
- holding means for holding the terminal voltage immediately before the fall of the auxiliary winding
- a sample hold circuit for sampling the voltage held by the holding means based on the detection output of the detection circuit.
- This sample and hold circuit is based on an oscillation signal having a predetermined frequency and based on the detection output of the first sample and hold circuit for sampling the voltage according to the terminal voltage of the auxiliary winding and the detection output of the detection circuit.
- the second sample and hold circuit is configured to have a second sample and hold circuit that samples the voltage held by the first sample and hold circuit.
- the second sample and hold circuit includes first sample and hold means for sampling the hold voltage of the first sample and hold circuit, and second and second samples for sampling the hold voltage of the first sample and hold circuit.
- Sample hold means, and the first sample hold means and the second sample hold means are alternately held by the first sample hold circuit every period based on the detection output of the detection circuit. It is configured to perform sampling.
- the terminal voltage of the auxiliary winding can be sampled at a timing immediately before the current flowing through the secondary-side rectifying diode becomes zero. Even when the output voltage fluctuates, accurate sampling can be performed with little error. Therefore, it is not affected by the forward voltage of the secondary diode and variations in device characteristics! /, The correct voltage can be detected.
- the terminal voltage of the auxiliary winding is sampled at a timing very close to the point where the current flowing through the secondary-side rectifying diode becomes zero.
- FIG. 1 is a circuit diagram showing a configuration of a switching power supply device according to a first embodiment of the present invention.
- FIG. 2 is a time chart showing changes in signals and voltages in the circuit of FIG.
- FIG. 6 is a time chart showing an enlarged part of a period in the time chart of FIG.
- FIG. 3 is a time chart showing changes in signals and voltages inside the circuit of FIG.
- FIG. 4 is a circuit diagram showing a switching power supply device according to a second embodiment of the present invention.
- FIG. 5 is a circuit diagram showing the overall configuration of a switching regulator disclosed in Patent Document 1.
- FIG. 6 is a circuit diagram showing a configuration example of a trigger control circuit that detects the terminal voltage of the primary side auxiliary winding in the circuit of FIG. 5 and gives sampling timing.
- FIG. 7 is a time chart showing changes in signals and voltages inside the regulator of FIG.
- FIG. 8 is a time chart showing changes in the auxiliary winding voltage and changes in the secondary diode current in the regulator of FIG. 5.
- FIG. 9 is a circuit diagram showing a configuration of a switching power supply device according to a third embodiment.
- FIG. 10 is a circuit configuration diagram showing a specific circuit example of a rising edge detection circuit and a falling edge detection circuit of an oscillation signal.
- FIG. 11 is a time chart showing changes in the auxiliary winding voltage Vb, the detection signal of the falling detection unit, the output signal of the oscillator, and the sampling signals S & H1, S & H2.
- FIG. 12 shows an example of changes in signals and voltages at various parts in the switching power supply of Embodiment 2
- FIG. 12 (B) shows changes in signals and voltages at various parts in the switching power supply of Embodiment 3. It is a time chart which shows an example.
- FIG. 1 is a circuit diagram showing a configuration of a switching power supply device according to a first embodiment of the present invention. It is.
- the switching power supply 10 of this embodiment includes a diode bridge circuit 11 and a smoothing capacitor C1 that rectifies an alternating voltage (AC) and converts it into a direct current voltage, a primary winding Np, and an auxiliary winding Nb.
- Transformer T1 having a secondary wire Ns, a switching transistor TrO connected in series with the primary wire Np of this transformer T1, resistors Rl, R2 for dividing the voltage across the terminals of the auxiliary wire Nb, and resistors
- the switching control circuit 12 drives the transistor TrO according to the feedback voltage VFB divided by Rl and R2.
- the switching control circuit 12 is formed as a semiconductor integrated circuit on a single semiconductor chip such as a single crystal silicon substrate.
- a rectifying diode D1 connected in series with the secondary winding Ns, and between the power sword terminal of the diode D1 and the other terminal of the secondary winding Ns And a smoothing capacitor C2 connected to the primary winding Np by rectifying and smoothing the alternating current induced in the secondary winding Ns by passing a current intermittently through the primary winding Np.
- the switching control circuit 12 includes a falling detection unit 12A that monitors the feedback voltage VFB and detects the falling of the auxiliary winding voltage Vb, and a first-stage sample-and-hold that samples the feedback voltage VFB at a predetermined cycle. Select the voltage of the sampling circuit that is in the hold state from the two sampling circuits and the second stage sample-and-hold unit that has two sampling circuits that alternately sample the sampled voltage every cycle. Then, the signal switching unit 12D that outputs the error signal, the error amplifying circuit 12E that amplifies the potential difference between the error signal and the predetermined reference voltage Vref2, and the switching transistor TrO according to the output of the error amplifying circuit 12E. A switching pulse to be turned on and off, and a drive pulse generator 12F that generates a pulse.
- the drive pulse generator 12F includes an oscillator OSC2 that generates a triangular wave with a predetermined frequency, a comparator CP M2 that compares the output of the oscillator OSC2 and the output of the error amplifier circuit 12E, an inverter G1, a resistor R3, and A one-shot pulse generation circuit that has a CR time constant circuit composed of a capacitor C3 and an AND gate G2 to detect a change in the output of the comparator CPM1 and generates a pulse; a flip-flop FF3 that is set by the generated pulse;
- the switching transistor TrO includes a comparator CPM3 that compares the emitter voltage of the transistor TrO with a predetermined reference voltage Vrefi. The output of the comparator CPM3 is input to the reset terminal of the flip-flop FF3.
- flip-flop FF3 when flip-flop FF3 is set by the output of AND gate G2, switching 'transistor TrO is turned on and current flows through primary winding Np, and flip-flop FF3 is output from comparator CPM3.
- the switching 'transistor TrO When reset by, the switching 'transistor TrO is turned off and the primary winding Np current is cut off. By repeating this, an intermittent current flows through the primary winding Np.
- the switching 'transistor TrO is turned off by increasing the timing at which the transistor TrO is also turned on to lengthen the on time, and when the feedback voltage VFB increases, the switching' transistor TrO is turned off.
- the falling detection unit 12A includes a powerful falling detection circuit DIF such as a differentiation circuit that detects the falling of the feedback voltage VFB, that is, the falling of the auxiliary winding voltage Vb, the detection signal, and a predetermined reference voltage Vrefl.
- a powerful falling detection circuit DIF such as a differentiation circuit that detects the falling of the feedback voltage VFB, that is, the falling of the auxiliary winding voltage Vb, the detection signal, and a predetermined reference voltage Vrefl.
- Comparator CMP1 a toggle flip-flop FF1 whose output is inverted by the output of the comparator CMP1
- a Zener diode Dz connected in the reverse direction between the output terminal of the comparator CMP1 and the ground point.
- Diode Dz is for eliminating negative pulses generated by the differentiation circuit detecting the rising edge of the waveform.
- Zener diode Dz may be provided between falling detection circuit DIF and comparator CMP 1! ,.
- the first-stage sample-and-hold unit 12B includes the oscillator OSC1, the switching element SW1 that is turned on / off by the oscillation signal, and the sampling that takes in the feedback voltage VFB during the period when the switching element SW1 is turned on! Capacity Csl and power.
- the oscillation frequency of the oscillator OSC1 is set to a frequency (for example, 1 MHz) that is about 10 times the oscillation frequency (for example, 100 kHz) of the oscillator OSC2 of the drive pulse generator 12F. ing.
- Oscillator OSC1 oscillation frequency The oscillation frequency is preferably at least 5 times, more preferably at least 10 times, and even more preferably at least 20 times. Therefore, the auxiliary winding voltage Vb shown in FIG. It becomes easier to sample the voltage at a point closer to the point where the current flowing through the diode becomes 0 than the point of.
- the second-stage sample-and-hold unit 12C includes the switching elements SW2 and SW3 connected to the output node N1 of the first-stage sample-and-hold part 12B and the first stage during the period when the switching element SW2 is on. It consists of a sampling capacitor Cs2 that captures the output potential of the sample-and-hold unit 12B and a sampling capacitor Cs3 that captures the output potential of the first-stage sample-and-hold unit 12B while the switching element SW3 is on.
- the switching elements SW2 and SW3 are alternately turned on each time the falling edge of the waveform is detected by the outputs Q and ZQ of the flip-flop FF1 of the falling detection unit 12A, and the period during which the switching elements SW2 and SW3 are turned on Control is performed so that the hold potential of the first-stage sample hold unit 12B is alternately taken into the sampling capacitors Cs2 and Cs3.
- ZQ is the negative phase signal of Q
- the signal switching unit 12D includes switching elements SW4 and SW5 connected between the sampling capacitors Cs2 and Cs3 and the output node N4.
- the switching element SW5 is turned on and off by the output Q of the flip-flop FF1 of the falling detection unit 12A, and SW4 is turned on and off by the inverted signal. That is, SW4 is complemented with SW2, and SW5 is complementarily turned on and off with SW3.
- the signal switching unit 12D has the sampling capacitor Cs2 set to the voltage when the sampling capacitor Cs2 is in the hold state after the sampling of the output potential of the first-stage sample hold unit 12B and the sampling capacitor Cs3 are set to one stage. After capturing the output potential of the first sample hold section 12B, the voltage in the hold state is output alternately.
- FIGS. 2 and 3 are time charts showing changes in signals and voltages inside the circuit of FIG. 1, and FIG. 2 is an enlarged view of a part of the time chart of FIG.
- (A) is the feedback voltage VFB, that is, the auxiliary winding voltage Vb
- (B) is the output of the oscillator OSC1 in the first stage sample-and-hold unit 12B
- (C) is the secondary diode D1.
- the flowing current Id, (D) is from the first stage sample hold section 12B to the second stage sample hole This is the sample and hold signal VS & HO that is supplied to the 12C section.
- (A) is the feedback voltage VFB, that is, the auxiliary winding voltage Vb
- (B) is the current Id flowing through the secondary diode D1
- (C) is the second stage from the falling detection unit 12A.
- (D) and (E) are sample hold signals supplied from the second stage sample hold unit 12C to the signal switching unit 12D VS & H1, VS & H2.
- the auxiliary winding voltage Vb is simplified.
- the switching element SW1 in the first stage sample hold unit 12B is turned off at the falling timing tl of the output of the oscillator OSC1. Hold the voltage of the immediately preceding sampling capacitor Csl. The timing tl is immediately before the timing t2 when the auxiliary winding voltage Vb falls and the current Id flowing through the secondary diode D1 becomes zero. Switching element SW1 avoids a drop in the transmitted voltage.
- a MOSFET is used as a transistor constituting switching control circuit 12, that is, when it is formed as a CMOS integrated circuit, a P-channel MOSFET and an N-channel MOSFET are connected in parallel. It is desirable to use a transmission gate connected to
- the hold voltage of Csl is the output Q of the flip-flop FF1 of the falling detection unit 12A, that is, the timing at which the sampling Z hold control signal SHC changes t21, t22 (see Fig. 3).
- the switching elements SW2 and SW3 of the sample-and-hold unit 12C are alternately turned on or off, the sampling capacitors Cs2 and Cs3 are alternately sampled and held, and the voltage is held in the error state by the signal switching circuit 12D during the hold state. Supplied to 12E.
- the voltage Vb at the time of the fall of the auxiliary winding voltage Vb should be sampled and supplied to the error amplification circuit 12E, but the fall of the auxiliary winding voltage Vb should be detected by the differentiation circuit. If the sampling timing is used, the sampling operation is delayed due to the circuit delay, and sampling cannot be performed at the timing when the current Id force flowing in the secondary diode D1 is reached.
- the auxiliary winding voltage Vb is sampled by the first stage sample-and-hold unit 12B at the output of the oscillator OSC1. When the falling edge of the auxiliary winding voltage Vb is detected, it is sampled by the second stage sample hold unit 12C, so there is virtually no time delay even if the sampling signal SHC is delayed. Sampling becomes possible.
- FIG. 4 is a circuit diagram showing a configuration of the switching power supply device according to the second embodiment of the present invention.
- the switching power supply device 10 of this embodiment has a configuration in which the diode bridge circuit 11 is omitted and direct DC voltage is directly input, and signal switching is performed between the first-stage sample hold section 12B and the second-stage sample hold section 12C. There are two systems of part 12D.
- the first stage sample hold unit 12B, the second stage sample hold unit 12C, and the signal switching unit 12D are provided in two systems. One is operated with the positive phase signal of OSC 1, and the other is operated with the reverse phase signal of OSC 1. It is made to operate.
- the signal switching unit 12D includes switching elements SW4a, SW5a and SW4b, SW5b that select voltages held by these two systems, a comparator CMP5 that compares the hold voltages of the two systems, Switching elements SW6 and SW7 are provided for selecting a force that uses the voltage sampled in any system by the output signal as an input signal of the error amplifier circuit 12E in the subsequent stage. Since the voltage value just before the fall of the auxiliary winding voltage can be held! /, The voltage value is higher! /, So the switching element is judged by the comparator CMP5. It is a mechanism to switch between SW6 and SW7. As a result, the fall of the auxiliary winding voltage (secondary diode current) becomes zero. It is possible to hold the value immediately before starting and to perform accurate constant voltage control by performing feedback control according to the value.
- the feedback voltage is provided before the sample hold unit 12C.
- sample hold unit 12B that samples (auxiliary winding voltage) with a predetermined oscillation signal.
- the present invention is not limited to this, and any means that can hold the voltage waveform immediately before the auxiliary winding falls.
- it may be configured by any type of circuit such as a holding circuit in which buffer amplifiers are connected in multiple stages.
- the voltage obtained by dividing the auxiliary winding voltage Vb by resistance is used as the feedback voltage.
- the auxiliary winding voltage Vb may be used as it is.
- the first-stage sample-and-hold unit 12B and the drive pulse generation unit 12F are each provided with a divider instead of the power oscillator OSC2 and the oscillator OSC1 and OSC2.
- a signal obtained by dividing the signal generated by OSC1 may be used.
- the switching transistor TrO may be formed by an external element, but the on-chip formed on the semiconductor chip on which the switching control circuit 12 is formed. An element may be used.
- the switching power supply device of the second embodiment the output of the oscillator OSC1 and its inverted signal (on the off-control signal of the sampling switching elements SWla, SWlb of the first stage sample hold unit 12B) In both cases, sample hold operation is performed alternately using a duty of 50%.
- FIG. 9 is a circuit diagram showing a configuration of the switching power supply device of the third embodiment.
- Book The switching power supply according to the embodiment has substantially the same configuration as the switching power supply according to the second embodiment of FIG.
- the difference from the switching power supply device of the second embodiment in FIG. 4 is that the circuit that generates the sampling signals S & H1, S & H2 for controlling the on / off control of the sampling switching elements SWla, SWlb of the first-stage sample-and-hold unit 12B This is because a rise detection circuit 13a for detecting the rise of the output of OSC1 and a fall detection circuit 13b for detecting the fall of the output of OSC1 are used instead of the output of C1.
- the sampling signal generation circuit is not limited to the rising edge detection circuit 13a and the falling edge detection circuit 13b as long as it generates a signal that satisfies the conditions described below.
- FIG. 10 shows specific circuit examples of the rising edge detection circuit 13a and the falling edge detection circuit 13b.
- an odd number of inverters and an RC time constant circuit are connected in series to delay the output of the oscillator OSC1, and the output signal of the oscillator OSC1 and the signal delayed by the delay circuit DLY1
- the rising edge detection circuit 13a is configured by the AND gate circuit G1 having the input of.
- the first stage inverter that inverts the output signal of the oscillator OSC1 the delay circuit DLY2 in which an odd number of inverters and an RC time constant circuit are connected in series, and the output signal of the first stage inverter and the delay circuit DLY2
- the fall detection circuit 13b is configured by an AND gate circuit G2 that receives the delayed signal as an input.
- the rise detection circuit 13a and the fall detection circuit 13b are one-shot pulse generation circuits. Of these, the rise detection circuit 13a is synchronized with the rise of the output signal of the oscillator OSC1, and corresponds to the delay time tdl of the delay circuit DLY1. The rising edge detection signal with the pulse width to be generated is generated as the sampling signal S & H1. The fall detection circuit 13b generates a fall detection signal having a pulse width corresponding to the delay time td2 of the delay circuit DLY2 as the sampling signal S & H2 in synchronization with the fall of the output signal of the oscillator OSC1.
- the rise detection circuit 13a and the fall detection circuit 13b are configured by using an external element for the resistance and capacitance of the delay circuit DLY1 and delay circuit DLY2 constituting them, or by making the resistance value and capacitance value variable. Thus, the circuit can be adjusted in delay time.
- FIG. 11 shows the auxiliary winding voltage Vb, the detection signal of the falling detector 12A (the input signal of FF1 in FIG. 9) FD, the output signal of the oscillator OSC1, and the sampling signals S & H1, S & H2
- the symbol tO is the timing when the current flowing through the diode D1 becomes “0”. Since the oscillator OSC1 operates asynchronously with the oscillator OSC2, the phase of the output waveform of the oscillator OSC1 is slightly shifted from the waveform of the auxiliary winding voltage Vb.
- FIG. 11 shows a state in which the falling timing of the sampling signal S & H2 coincides with the timing tO when the current flowing through the diode D1 becomes “0”.
- the inventors conducted a simulation and the like and examined in detail.
- the detection signal FD of the falling detection unit 12A rises from the timing tO when the current flowing through the diode DI becomes "0".
- T1 is the time from the falling edge of sampling signal S & H1 to the rising edge of S & H2, let ⁇ 2 be desirable so that ⁇ 2> ⁇ 1.
- ⁇ 2 is set so that ⁇ 2 and T1
- the value of auxiliary auxiliary voltage Vb after the current of diode D1 becomes ⁇ 0 '' is sampled between timing tO and tl.
- the auxiliary winding voltage Vb just before the current of the diode D1 becomes “0” cannot be sampled.
- the setting is made so that T2> T1.
- T1 is set so that the falling detection unit 12A does not detect noise included in the auxiliary winding terminal voltage Vb.
- T2 can be set by appropriately selecting the frequency of the oscillator OSC1 and the delay time tdl of the delay circuit DLY1. Specifically, the delay time tdl can be set to a desired value by changing the values of the resistance and capacitance of the RC time constant circuit constituting the delay circuit DLY1.
- Embodiment 3 having the above-described configuration is more desirable than Embodiment 2 in which the output of the oscillator OSC1 is used as the sampling signal in the first-stage sample-and-hold unit 12B will be described. .
- FIG. 12 (A) shows an example of changes in signals and voltages at various parts in the switching power supply apparatus of Embodiment 2
- FIG. 12 (B) shows signals and voltages at various parts in the switching power supply apparatus according to Embodiment 3.
- An example of the change in voltage is shown.
- (h) is the voltage VS & H1 sampled and held in the capacitor Csla by the sampling signal S & H1 of (g)
- (1) is the voltage of (k).
- the voltage VS & H2 is sampled and held in the capacitor Cslb by the sampling signal S & H2, and the input voltage Vb is taken into the capacitors Csla and Cslb during the high level period of S & H1 and S & H2. Hold.
- the voltage VS & H1 is sampled by the signals S & H3 and S & H4 of (d) and (e) to become the voltages VS & H3 and VS & H4 of (i) and (j), and the voltage VS & H2 of (d) and (e) Sampled by signals S & H5 and S & H6, they become voltages VS & H5 and VS & H6 of (m) and (n).
- the voltage V S & H3 and VS & H4 are selected (extracted) by the hold part by the switches SW4a and SW5a of the signal switching unit 12D, and the voltage VS & H5 and VS & H6 are selected (extracted) by the switch SW4b and SW5b. Supplied to CMP5.
- sampling signals S & H1, S & H2 are in-phase and anti-phase signals with the same duty 50% as the output of oscillator OSC1, as shown in (g) and (k) in FIG. In Fig. 12 (B), the signal has a small pulse width synchronized with the output of the oscillator OSC1 and its opposite phase signal.
- Fig. 12 (A) The problem in Fig. 12 (A) is that when the voltage VS & H2 sampled and held by the signal S & H2 in (k) is sampled and held by the signals S & H5 and S & H6 in (d) and (e), If the timing overlaps, there is a risk of holding the voltage value in the middle of decreasing voltage VS & H2 in (1) as shown in (m) and (n).
- the signals S & H 1 and S & H 2 in (g) and (k) are made to have narrow pulse widths, and the circuit is designed so that T 2> T 1 as described above. Therefore, the timings of the signals S & H2, S & H5, and S & H6 can be prevented from overlapping as much as possible, thereby avoiding holding the voltage value while the voltage VS & H2 is decreasing.
- the comparator CMP5 compares the voltage values in the circles (h) and (1) to select the voltage (h).
- Fig. 12 (A) when viewed from the auxiliary winding voltage Vb, This results in holding the voltage value.
- Fig. 12 (B) the voltage value immediately before the fall can be held. Therefore, as shown in FIG. 12 (o), a potential difference of ⁇ occurs between the second embodiment and the third embodiment at the output of the signal switching unit serving as the error amplifier input.
- the voltage before the falling of the auxiliary winding voltage Vb is sampled from the one that samples the voltage value during or after the falling, and the voltage before the falling is separated.
- a signal whose value is sampled can be used as a feedback signal.
- a frequency divider is provided instead of the force oscillator OSC2 provided with the oscillators OSC1 and OSC2 in the first-stage sample hold unit 12B and the drive pulse generation unit 12F, respectively.
- a signal obtained by dividing the oscillation signal supplied from the outside may be input to the rising edge detection circuit 13a and the falling edge detection circuit 13b to generate the sampling signals S & H1, S & H2.
- the present invention is not limited to a separately excited switching power supply device, but can also be used for a self-excited switching power supply device.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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CN2007800038952A CN101375489B (zh) | 2006-01-31 | 2007-01-29 | 开关电源装置以及电源控制用半导体集成电路 |
DE112007000220T DE112007000220T5 (de) | 2006-01-31 | 2007-01-29 | Schaltende Stromversorgungsvorrichtung und integrierte Halbleiterschaltung zum Steuern einer Stromversorgung |
JP2007556843A JP4752842B2 (ja) | 2006-01-31 | 2007-01-29 | スイッチング電源装置および電源制御用半導体集積回路 |
US12/162,948 US8130516B2 (en) | 2006-01-31 | 2007-01-29 | Switching power supply control semiconductor integrated circuit sampling an auxiliary wiring voltage near a point at which a secondary rectifier diode current becomes zero |
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PCT/JP2006/301519 WO2007088577A1 (ja) | 2006-01-31 | 2006-01-31 | スイッチング電源装置および電源制御用半導体集積回路 |
JPPCT/JP2006/301519 | 2006-01-31 |
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PCT/JP2006/301519 WO2007088577A1 (ja) | 2006-01-31 | 2006-01-31 | スイッチング電源装置および電源制御用半導体集積回路 |
PCT/JP2007/051365 WO2007088803A1 (ja) | 2006-01-31 | 2007-01-29 | スイッチング電源装置および電源制御用半導体集積回路 |
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PCT/JP2006/301519 WO2007088577A1 (ja) | 2006-01-31 | 2006-01-31 | スイッチング電源装置および電源制御用半導体集積回路 |
Country Status (4)
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US (1) | US8130516B2 (ja) |
CN (1) | CN101375489B (ja) |
DE (1) | DE112007000220T5 (ja) |
WO (2) | WO2007088577A1 (ja) |
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WO2007088577A1 (ja) * | 2006-01-31 | 2007-08-09 | Mitsumi Electric Co., Ltd. | スイッチング電源装置および電源制御用半導体集積回路 |
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JP5983172B2 (ja) * | 2012-08-10 | 2016-08-31 | 富士電機株式会社 | スイッチング電源装置及びスイッチング電源装置の制御回路 |
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- 2007-01-29 CN CN2007800038952A patent/CN101375489B/zh not_active Expired - Fee Related
- 2007-01-29 US US12/162,948 patent/US8130516B2/en not_active Expired - Fee Related
- 2007-01-29 DE DE112007000220T patent/DE112007000220T5/de not_active Ceased
- 2007-01-29 WO PCT/JP2007/051365 patent/WO2007088803A1/ja active Application Filing
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Also Published As
Publication number | Publication date |
---|---|
CN101375489B (zh) | 2011-07-13 |
US20090021968A1 (en) | 2009-01-22 |
WO2007088577A1 (ja) | 2007-08-09 |
CN101375489A (zh) | 2009-02-25 |
DE112007000220T5 (de) | 2008-12-11 |
US8130516B2 (en) | 2012-03-06 |
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