WO2005053141A1 - スイッチング電源装置 - Google Patents
スイッチング電源装置 Download PDFInfo
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- WO2005053141A1 WO2005053141A1 PCT/JP2004/015714 JP2004015714W WO2005053141A1 WO 2005053141 A1 WO2005053141 A1 WO 2005053141A1 JP 2004015714 W JP2004015714 W JP 2004015714W WO 2005053141 A1 WO2005053141 A1 WO 2005053141A1
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- Prior art keywords
- transformer
- winding
- switch
- power supply
- main switch
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/08—High-leakage transformers or inductances
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
- H01F27/38—Auxiliary core members; Auxiliary coils or windings
-
- 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
- H02M3/33569—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 having several active switching elements
-
- 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
- H02M3/01—Resonant DC/DC converters
Definitions
- the present invention relates to a high-efficiency, small-sized, low-noise switching power supply device.
- FIG. 1 shows a circuit configuration diagram of a conventional switching power supply of this type (Non-Patent Document 1, Non-Patent Document 2).
- a main switch Q1 such as a MOSFET (hereinafter referred to as an FET) is connected to a DC power supply Vdcl via a primary winding 5a (number of turns nl) of a transformer T.
- a parallel circuit including a resistor R2 and a capacitor C2 and a diode D3 connected in series to the parallel circuit are connected.
- the main switch Q1 is turned on and off by the PWM control of the control circuit 100.
- the primary winding 5a of the transformer T and the secondary winding 5b of the transformer T are wound so that a common-mode voltage is generated therebetween, and the secondary winding 5b of the transformer T (number of turns n2 ) Is connected to a rectifying / smoothing circuit including diodes Dl and D2, a rear turtle L1 and a capacitor C4.
- This rectifying / smoothing circuit rectifies and smoothes the voltage (north voltage controlled on-Z off) induced in the secondary winding 5b of the transformer T, and outputs a DC output to the load RL.
- the control circuit 100 includes an operational amplifier and a photo power blur (not shown).
- the operational amplifier compares the output voltage of the load RL with a reference voltage, and when the output voltage of the load RL becomes higher than the reference voltage. Next, control is performed so as to reduce the ON width of the pulse applied to the main switch Q1. That is, when the output voltage of the load RL becomes equal to or higher than the reference voltage, the output voltage is controlled to a constant voltage by narrowing the ON width of the pulse of the main switch Q1.
- FIG. 2 shows a voltage Qlv between both ends of the main switch Q1, a current Qli flowing through the main switch Q1, and a Q1 control signal for controlling the main switch Q1 to be turned on and off.
- the main switch Q1 changes from the on state to the off state by the Q1 control signal.
- the excitation energy of the primary winding 5a of the transformer T and the energy of the leakage inductance Lg (inductance coupled with the secondary winding 5b) are not transmitted to the secondary winding 5b.
- capacitor C2 Stored in capacitor C2 via D3.
- a snubber circuit (C2, R2) is inserted to make the temporal change of the voltage of the main switch Q1 gradual, so that the switching noise can be reduced and the transformer can be reduced.
- the surge voltage to the main switch Q1 due to the leakage inductance Lg of T can be suppressed.
- Non-Patent Document 1 Kosuke Harada, “Switching Power Supply, No. Book”, published by Nikkan Kogyo Shimbun, Chapter 2 Basic Circuit of Switching Power Supply and Design Practice p. 27 Figure 2.2
- Non-Patent Document 2 Shizuo Shimizu, “High-speed Switching Regulator”, Sogo Denshi Shuppansha, 2.2.1 Separately-excited converter ⁇ 30 Figure 2.5
- the transformer exciting current flowing through the primary winding 5a of the transformer T is, as shown in FIG.
- switch Ql When switch Ql is on, it increases linearly with a positive value, and when main switch Q1 is off, it decreases linearly to zero. That is, as shown in FIG. 3, since the magnetic flux of the transformer T uses only the first quadrant of the BH force, the transformer T whose core utilization of the transformer T is low is large.
- An object of the present invention is to provide a switching power supply device that enables downsizing of a transformer and zero-voltage switching of a switch, and that can achieve small size, high efficiency, and low noise.
- the present invention has the following configurations in order to solve the above-mentioned problems.
- the invention of claim 1 provides a first series circuit connected to both ends of a DC power supply, wherein a primary winding of a transformer and a main switch are connected in series, and a secondary circuit of the transformer when the main switch is turned on.
- a third series circuit connected to both ends of the main switch, a first diode and a snubber capacitor connected in series, a connection point between the first diode and the snubber capacitor, and the auxiliary switch.
- a fourth series circuit connected to a connection point with the clamp capacitor and having an auxiliary winding of the transformer and a second diode connected in series; and the main switch and the auxiliary switch alternately.
- the control circuit turns on the auxiliary switch, turns off the auxiliary switch when the excitation current increases, and turns on the auxiliary switch to zero voltage when the excitation current is increased by turning on the auxiliary switch. It is characterized by switching.
- the rectifying and smoothing circuit includes a fifth series circuit including a secondary winding and a tertiary winding of the transformer, and a first rectifier connected to both ends of the fifth series circuit.
- the core of the transformer has a primary winding and a secondary winding of the transformer.
- the transformer is wound so as to have a leakage inductance, and the primary winding and the tertiary winding of the transformer have a leakage inductance smaller than the leakage inductance of the primary winding and the secondary winding.
- the primary winding and the auxiliary winding of the transformer are smaller than the leakage inductance of the primary winding and the secondary winding, and the primary winding and the tertiary winding are smaller than the leakage inductance of the primary winding and the secondary winding. It is characterized by being wound so as to have a leakage inductance larger than the leakage inductance.
- the invention of claim 5 is characterized in that a part having a small cross-sectional area is provided in a part of the magnetic path of the core of the transformer.
- the first series circuit connected to both ends of the DC power supply, wherein the primary winding of the transformer and the main switch are connected in series, and the first series circuit connected to the transformer when the main switch is turned off.
- a rectifying / smoothing circuit for rectifying and smoothing the voltage output to the secondary winding, a rectifying / smoothing circuit connected to both ends of the main switch or both ends of the primary winding of the transformer, and an auxiliary switch and a clamp capacitor connected in series; (2) a series circuit, a third series circuit connected to both ends of the main switch, and a first diode and a snapper capacitor connected in series, a connection point between the first diode and the snubber capacitor, A fourth series circuit connected to a connection point between an auxiliary switch and the clamp capacitor, the auxiliary winding of the transformer and a second diode being connected in series; the main switch and the auxiliary switch; A control circuit for alternately turning on and off the battery, discharging the electric charge of the sn
- the invention of claim 7 is characterized in that the rectifying and smoothing circuit has a series circuit of a rectifying diode and a smoothing capacitor connected to both ends of a secondary winding of the transformer.
- the primary winding and the secondary winding of the transformer are wound around the core of the transformer so as to have leakage inductance, and the primary winding of the transformer and the primary winding are connected to each other.
- the auxiliary winding is wound so as to have a leakage inductance larger than a leakage inductance of the primary winding and the secondary winding.
- the utilization factor of the magnetic flux of the core of the transformer is improved, and the transformer can be downsized. Also, by adjusting the capacitance of the snubber capacitor, the slope of the voltage rise when the main switch is off can be reduced, the flux utilization rate of the transformer core can be adjusted, and the energy of the snubber capacitor is released to the output. Therefore, low noise, miniaturization, and high efficiency can be achieved.
- FIG. 1 is a circuit configuration diagram showing a conventional switching power supply device.
- FIG. 2 is a timing chart of signals in respective parts of a conventional switching power supply device.
- FIG. 3 is a diagram showing BH characteristics of a transformer provided in a conventional switching power supply device.
- FIG. 4 is a timing chart of an exciting current of a transformer provided in a conventional switching power supply device.
- FIG. 5 is a circuit configuration diagram showing a switching power supply device according to Embodiment 1.
- FIG. 6 is a timing chart of signals in each part of the switching power supply device according to the first embodiment.
- FIG. 7 is a timing chart showing details of signals at various parts when a switch Q1 of the switching power supply device according to the first embodiment is turned on.
- FIG. 8 is a timing chart showing details of signals in each unit when the switch Q1 of the switching power supply device according to the first embodiment is turned off.
- FIG. 9 is a diagram illustrating a manner in which the rise time changes according to the size of the snubber capacitor Cx when the switch Q1 of the switching power supply device according to Embodiment 1 is turned off.
- FIG. 10 is a diagram illustrating BH characteristics of a transformer having a low core of the switching power supply device according to the first embodiment.
- FIG. 11 shows B-H characteristics of a transformer having a high core of the switching power supply device of the first embodiment
- FIG. 12 is a timing chart of a current flowing through a transformer provided in the switching power supply device according to the first embodiment.
- FIG. 13 is a circuit configuration diagram illustrating a switching power supply device according to Embodiment 2.
- FIG. 14 is a structural diagram of a transformer provided in the switching power supply device of Embodiment 2.
- FIG. 15 is a circuit diagram showing a switching power supply device according to Embodiment 3.
- FIG. 16 is a structural diagram of a transformer provided in a switching power supply device according to Embodiment 3.
- FIG. 17 is a timing chart of signals in each part of the switching power supply device according to the third embodiment.
- FIG. 18 is a timing chart showing details of signals at various parts when switch Q1 of the switching power supply device according to Embodiment 3 is turned on.
- FIG. 19 is a timing chart showing details of signals at various parts when the switch Q1 of the switching power supply according to Embodiment 3 is turned off.
- the switching power supply device provides an auxiliary winding in the transformer, and discharges the electric charge of the snubber capacitor connected via the diode to the clamp capacitor via the auxiliary winding when the main switch is turned on.
- the slope of the voltage rise when the main switch is turned off is moderated, and by turning on the auxiliary switch connected in series with the clamp capacitor, the The magnetic flux is deflected to the negative side to expand the magnetic flux change range and, when the exciting current increases, turn off the auxiliary switch and perform zero voltage switching (ZVS) on the main switch to establish the ZVS of the switch.
- the transformer is characterized by high efficiency, low noise, and a downsized transformer.
- FIG. 5 is a circuit configuration diagram of the switching power supply device according to the first embodiment.
- a series circuit of a primary winding 5a (number of turns nl) of a transformer T1 and a switch Q1 (main switch) composed of an FET is connected to both ends of a DC power supply Vdcl.
- a diode D4 is connected in parallel to both ends of the switch Q1.
- a connection point between one end of the primary winding 5a of the transformer T1 and one end of the switch Q1 is connected to one end of a switch Q2 (auxiliary switch) composed of an FET, and the other end of the switch Q2 is connected to a clamp capacitor C1.
- the power supply is connected to the positive terminal of the DC power supply Vdcl.
- the other end of the switch Q2 is connected to the negative terminal of the DC power supply Vdc1 via the clamp capacitor C1.
- a series circuit of a diode Dx1 and a snubber capacitor Cx is connected to both ends of the switch Q1.
- a series circuit of an auxiliary winding 5x (number of turns nx) of the transformer T1 and a diode Dx2 is connected to a connection point between the diode Dxl and the capacitor Cx and a connection point between the switch Q2 and the clamp capacitor C1.
- the auxiliary winding 5x of the transformer T1 discharges the energy stored in the capacitor Cx to the clamp capacitor C1 when the switch Q1 is turned on.
- a diode D3 is connected in parallel to both ends of the switch Q2. Further, the diode 4 may be a parasitic diode of the switch Q1, and the diode D3 may be a parasitic diode of the switch Q2.
- the switches Ql and Q2 have a period in which they are both turned off (dead time), and are turned on and off alternately by the PWM control of the control circuit 10.
- the core of the transformer T1 is wound with a primary winding 5a and a secondary winding 5b (number of turns n2) in phase with the winding, and one end of the secondary winding 5b is
- the anode of the diode D1 is connected to the diode D1
- the force source of the diode D1 and the other end of the secondary winding 5b are connected to the diode D2.
- a series circuit of a rear turtle L1 and a capacitor C4 is connected to both ends of the diode D2.
- Diode D1, diode D2, capacitor C4, and rear turtle L1 make up a rectifying and smoothing circuit. This capacitor C4 outputs a DC output to the load RL.
- the control circuit 10 alternately turns on and off the switch Q1 and the switch Q2 to reduce the on-width of the pulse applied to the switch Q1 when the output voltage of the load RL exceeds the reference voltage. Then, control is performed so as to widen the ON width of the pulse applied to the switch Q2. Snow That is, when the output voltage of the load RL exceeds the reference voltage, the output voltage is controlled to a constant voltage by reducing the ON width of the switch Q1! / Puru.
- the magnetic flux is divided into the first quadrant and the third quadrant around the zero on the BH curve. Increase or decrease equal to.
- the magnetic flux is not completely symmetrical and is mainly in the first quadrant.
- the magnetic field H is generated in proportion to the magnitude of the current i.
- the magnetic flux B moves on the B—H curve in the order of Ba ⁇ Bb ⁇ Bc ⁇ Bd ⁇ Be ⁇ Bf ⁇ Bg, and the operating range of the magnetic flux is wide. There is saturation between Ba-Bb and Bf-Bg on the B-H curve.
- the core shows no B-H curve when the magnetic permeability of the core is low.
- the core is not saturated.
- FIG. 6 is a timing chart of signals in each part of the switching power supply device according to the first embodiment.
- FIG. 7 is a timing chart showing details of signals at various parts when the switch Q1 of the switching power supply device according to the first embodiment is turned on.
- FIG. 8 is a timing chart showing details of signals at various parts when the switch Q1 of the switching power supply device according to the first embodiment is turned off.
- this current nli has a current value a (negative value) at time tl, a current value b (negative value) at time tlb, a current value c (zero) at time tl3, and a current value at time t2. It changes to the value d (positive value).
- the magnetic flux changes from Ba to Bb to Bc to Bd. Note that Ba—Bg shown in FIG. 11 and a—g shown in FIG. 12 correspond to each other.
- the capacitor Cx is charged to the maximum voltage of the switch Q1, and a voltage is induced in the auxiliary winding 5x by this voltage and the applied polarity.
- the current flows in the order of Cx ⁇ 5x ⁇ Dx2 ⁇ Cl ⁇ Vdcl ⁇ Cx, and all the charge of the capacitor Cx moves to the clamp capacitor C1, and the voltage Cxv of the capacitor Cx becomes zero.
- the current waveform of the capacitor Cx at this time is determined by the leakage inductance between the primary winding 5a and the auxiliary winding 5x of the transformer T1 and the resonance frequency of the capacitor Cx.
- the diode D3 conducts, a diode current flows, and the clamp capacitor C1 is charged.
- the switch Q2 becomes a zero-voltage switch.
- the current nli changes from the current value d (positive value) to the current value e (zero) from time t2 to time t20.
- the magnetic flux changes from Bd to Be.
- the current nli becomes as shown in FIG. Negative value .
- the current nli changes from the current value e (zero) to the current value f (negative value) at time t20-time t2a.
- the magnetic flux changes from Be to Bf.
- the area S from time t2 to time t20 is equal to the area S from time t20 to time t2a. This area S corresponds to the energy of the transformer T1 stored in the clamp capacitor C1.
- the current nli changes from the current value f (negative value) to the current value g (negative value) between time t2a and time t3.
- the magnetic flux changes from Bf to Bg.
- the area E at time t2a—time t3 corresponds to the energy of the capacitor Cx stored in the clamp capacitor C1.
- the current nli increases by the amount of energy supplied from the capacitor Cx at the time of reset. Therefore, the magnetic flux moves to the third quadrant, reaches the saturation region (Bf-Bg), the current nli increases, and reaches the maximum at time t3 (also at time tl). The current nli increases just before the end of the ON period of the switch Q2, and is the current when the transformer T1 is saturated.
- the current immediately before the switch Q2 is turned off to achieve the ZVS of the switch Q1 depends on the capacitance of a capacitor connected in parallel with the switch Q1, and the smaller the capacitance, the smaller the current. Therefore, if the capacity of the capacitor to be selected is small and the power capacity is small, the slope of the voltage when the switch Q1 is off increases, and the loss and noise of the switch increase. For this reason, it is desirable that the parallel capacitance when the switch Q1 is on is small and the parallel capacitance when the switch Q1 is off is large. Therefore, in the first embodiment, the capacitance when the switch Q1 is on is set to be small (it may be a parasitic capacitance between the drain and the source of the switch Q1). When the switch Q1 is off, the capacitor Cx is connected in parallel via the diode Dxl. I'm caught.
- the energy of the capacitor Cx is transferred to the clamp capacitor C1, and the magnetic flux of the transformer T1 is shifted to the third quadrant side.
- the range of use of T1 is expanded, the current is increased, and ZVS of switch Q1 can be easily achieved.
- the current becomes higher than when the core reaches the saturation region of the transformer T1, and the ZVS operation of the switch Q1 becomes easier.
- FIG. 13 is a circuit configuration diagram showing a switching power supply device according to the second embodiment.
- the switching power supply device according to the second embodiment shown in FIG. 13 differs from the switching power supply device according to the first embodiment shown in FIG. 5 in the secondary circuit of the transformer T2.
- the transformer T2 includes a primary winding 5a (number of turns nl), a secondary winding 5b (number of turns n2), a tertiary winding 5c (number of turns n3), and an auxiliary winding 5x (number of turns nx). Is wound.
- a series circuit of a diode D6 and a capacitor C4 is connected to both ends of the series circuit of the secondary winding 5b and the tertiary winding 5c of the transformer T2.
- a diode D5 is connected to a connection point between the secondary winding 5b and the tertiary winding 5c and a connection point between the diode D6 and the capacitor C4.
- the primary winding 5a and the secondary winding 5b are wound in phase
- the primary winding 5a and the auxiliary winding 5x are wound in phase
- the primary winding 5a and the tertiary winding 5c are wound in phase. It is wound in reverse phase.
- the secondary winding 5b of the transformer T2 is loosely coupled to the primary winding 5a, and the leakage inductance between the primary winding 5a and the secondary winding 5b causes a rear turtle (shown in series) to be connected in series to the transformer T2. Without).
- the tertiary winding 5c of the transformer T2 is slightly loosely coupled to the primary winding 5a.
- the value of the inductance connected in series to the primary winding 5a of the transformer T2 is increased, and the energy stored when the switch Q1 is turned on is returned to the secondary side via the transformer T2. Therefore, the efficiency is improved. Also, the secondary current flows during the ON and OFF periods of the switch Q1 due to the diode D5 and the diode D6, and becomes continuous. Therefore, the ripple current of the capacitor C4 also decreases.
- FIG. 14 is a structural diagram of a transformer provided in the switching power supply device according to the second embodiment.
- the transformer T2 shown in FIG. 14 has a sun-shaped core 30, and a primary winding 5a and a tertiary winding 5c are wound close to each other on a core portion 30a of the core 30. .
- This provides a slight leakage inductance between the primary and tertiary windings.
- a pass core 30c and a gap 31 are formed in the core 30, and a secondary winding 5b is wound around the outer core.
- the auxiliary winding 5x is wound close to the primary winding 5a. That is, the leakage inductance is increased by loosely coupling the primary winding 5a and the secondary winding 5b by the pass core 30c.
- the primary winding 5a and the secondary winding 5b of the transformer T2 are wound around the core 30 of the transformer T2 so as to have leakage inductance, and the primary winding 5a and the tertiary winding of the transformer T2 are wound.
- 5c is wound so as to have a leakage inductance smaller than that of the primary winding 5a and the secondary winding 5b, and the primary winding 5a and the auxiliary winding 5x of the transformer T2 are the primary winding. It is wound so as to have a leakage inductance smaller than the leakage inductance of the primary winding 5a and the secondary winding 5b and larger than the leakage inductance of the primary winding 5a and the tertiary winding 5c.
- two concave portions 30b are formed on the outer peripheral core and between the primary winding 5a and the secondary winding 5b. Due to the recess 30b, the cross-sectional area of a part of the magnetic path of the outer core becomes narrower than that of the other part, and only that part is saturated, so that core loss can be reduced.
- the switching power supply device can be reduced in size and cost can be reduced by devising the shape of the core of the transformer T2 and the winding.
- FIG. 15 is a circuit configuration diagram showing a switching power supply device according to the third embodiment.
- the switching power supply device of the third embodiment shown in FIG. 15 differs from the switching power supply device of the first embodiment shown in FIG. 5 in the secondary side circuit of the transformer T3.
- the core of the transformer T3 is wound with a primary winding 5a and a secondary winding 5b (number of turns n2) having a phase opposite to that of the primary winding 5a, and one end of the secondary winding 5b.
- Is connected to the anode of diode D1 and the force source of diode D1 and the other end of secondary winding 5b are connected to capacitor C4.
- Diode D1 and capacitor C4 constitute a rectifying and smoothing circuit. This capacitor C4 smoothes the rectified voltage of the diode D1 and outputs a DC output to the load RL.
- FIG. 16 is a structural diagram of a transformer provided in the switching power supply device according to the third embodiment.
- the transformer T3 shown in FIG. 16 has a sun-shaped core 40, and a primary winding 5a and an auxiliary winding 5x are wound close to each other on a core portion 40a of the core 40.
- leakage inductance is provided between the primary and auxiliary windings.
- the secondary winding 5b is wound concentrically with the primary winding 5a and the auxiliary winding 5x. As a result, a slight leakage inductance is provided.
- a gap 41 is formed in the core portion 40a.
- the primary winding 5a and the secondary winding 5b of the transformer T3 are wound around the core 40 of the transformer T3 so as to have leakage inductance, and the primary winding 5a and the auxiliary winding 5x of the transformer T3 are wound. Are wound so as to have a leakage inductance larger than the leakage inductance of the primary winding 5a and the secondary winding 5b.
- FIG. 17 is a timing chart of signals in each part of the switching power supply device according to the third embodiment.
- FIG. 18 is a timing chart showing details of signals at various parts when the switch Q1 of the switching power supply device according to the third embodiment is turned on.
- FIG. 19 is a timing chart showing details of signals at various parts when the switch Q1 of the switching power supply device according to the third embodiment is turned off.
- FIGS. 17 to 19 the voltage Qlv between both ends of the switch Q1 and the voltage flowing through the switch Q1 are shown.
- the timing charts of FIGS. 17 to 19 are substantially the same as the timing charts of FIGS. 6 to 8, and only the operation of the secondary circuit of the transformer T3 is different. Therefore, only the operation of this part will be described. .
- switch Q1 is turned off, and the slope of the voltage rise when switch Q1 is off can be reduced by capacitor Cx.
- the energy stored in the capacitor C X is output to the secondary winding 5b of the transformer T3 when the switch Q2 is turned on. Therefore, the current Dli flows through the diode D1, and power is supplied to the load RL.
- the switching power supply of the present invention is applicable to a DC-DC conversion type power supply circuit and an AC-DC conversion type power supply circuit.
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Abstract
Description
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Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/550,654 US7130204B2 (en) | 2003-11-26 | 2004-10-22 | Switching power source apparatus |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003-395492 | 2003-11-26 | ||
| JP2003395492A JP3861871B2 (ja) | 2003-11-26 | 2003-11-26 | スイッチング電源装置 |
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| Publication Number | Publication Date |
|---|---|
| WO2005053141A1 true WO2005053141A1 (ja) | 2005-06-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2004/015714 Ceased WO2005053141A1 (ja) | 2003-11-26 | 2004-10-22 | スイッチング電源装置 |
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| Country | Link |
|---|---|
| US (1) | US7130204B2 (ja) |
| JP (1) | JP3861871B2 (ja) |
| WO (1) | WO2005053141A1 (ja) |
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| US11258291B2 (en) * | 2018-02-14 | 2022-02-22 | Lg Energy Solution, Ltd. | Power supply circuit for energy transfer between battery and smoothing capacitor, battery management system and battery pack |
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| US7964343B2 (en) | 2003-05-13 | 2011-06-21 | Ibis Biosciences, Inc. | Method for rapid purification of nucleic acids for subsequent analysis by mass spectrometry by solution capture |
| US8097416B2 (en) | 2003-09-11 | 2012-01-17 | Ibis Biosciences, Inc. | Methods for identification of sepsis-causing bacteria |
| US8546082B2 (en) | 2003-09-11 | 2013-10-01 | Ibis Biosciences, Inc. | Methods for identification of sepsis-causing bacteria |
| US8013142B2 (en) | 2003-09-11 | 2011-09-06 | Ibis Biosciences, Inc. | Compositions for use in identification of bacteria |
| US7956175B2 (en) | 2003-09-11 | 2011-06-07 | Ibis Biosciences, Inc. | Compositions for use in identification of bacteria |
| US8407010B2 (en) | 2004-05-25 | 2013-03-26 | Ibis Biosciences, Inc. | Methods for rapid forensic analysis of mitochondrial DNA |
| WO2007014045A3 (en) * | 2005-07-21 | 2007-04-26 | Isis Pharmaceuticals Inc | Methods for rapid identification and quantitation of nucleic acid variants |
| US11258291B2 (en) * | 2018-02-14 | 2022-02-22 | Lg Energy Solution, Ltd. | Power supply circuit for energy transfer between battery and smoothing capacitor, battery management system and battery pack |
Also Published As
| Publication number | Publication date |
|---|---|
| US20060187688A1 (en) | 2006-08-24 |
| JP3861871B2 (ja) | 2006-12-27 |
| US7130204B2 (en) | 2006-10-31 |
| JP2005160217A (ja) | 2005-06-16 |
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