WO2014188985A1 - 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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- WO2014188985A1 WO2014188985A1 PCT/JP2014/063151 JP2014063151W WO2014188985A1 WO 2014188985 A1 WO2014188985 A1 WO 2014188985A1 JP 2014063151 W JP2014063151 W JP 2014063151W WO 2014188985 A1 WO2014188985 A1 WO 2014188985A1
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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
- H02M3/33538—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 of the forward type
- H02M3/33546—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 of the forward type with automatic control of the output voltage or current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
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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
- H02M3/33569—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
- H02M3/33576—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 having at least one active switching element at the secondary side of an isolation transformer
Definitions
- the present invention relates to a switching power supply device including a switching element on a primary side of a transformer and an inductor and a rectifying element on a secondary side.
- Patent Document 1 shows an example in which a commutation diode is provided with a snubber circuit.
- FIG. 11 is a diagram illustrating an example of a secondary circuit of a switching power supply device including a snubber circuit disclosed in Patent Document 1.
- a secondary side circuit including a rectifying diode Da, a commutation diode Db, an inductor Lo, and an output capacitor Co is configured on the secondary side of the transformer T.
- An RC snubber circuit composed of a series circuit of a capacitor C and a resistor R is connected to both ends of the commutation diode Db.
- Patent Document 1 in order to solve the problem of the RC snubber circuit, the resistor R is not used, the transistor is turned on at the timing when the surge voltage is generated in the rectifier circuit, and the energy of the surge voltage is stored in the capacitor.
- An active snubber circuit that is to be released later is also shown.
- it is possible to regenerate the surge voltage energy but the entire circuit configuration becomes complicated, resulting in a problem that the occupied area on the substrate increases.
- An object of the present invention is to provide a switching power supply device that has a simple circuit configuration but avoids a loss due to the consumption of surge voltage energy in a snubber circuit and has improved power conversion efficiency.
- the switching power supply device of the present invention is configured as follows.
- corresponds to the code
- the switching power supply device of the present invention includes a transformer having a primary winding and a secondary winding, a primary side circuit including a switching element connected to the primary winding and intermittently supplying a DC power supply voltage to the primary winding.
- An inductor connected in series to a current path between the output terminal or the negative output terminal and the secondary winding, a first rectifier (Q1) and a second rectifier for rectifying the current flowing through the secondary winding and the inductor
- a secondary side circuit including a rectifying element (Q2), A first series circuit connected between a positive output terminal and a negative output terminal and comprising a third rectifier element (D3) and a fourth rectifier element (D4); A first end is connected to a connection point of the third rectifying element (D3) and the fourth rectifying element (D4), and the first rectifying element (Q1) or the end of the second rectifying element (Q2), A first capacitor (C1) having a second end connected to one end not connected to the first series circuit;
- a surge voltage generated between both ends of the first and second rectifier elements (Q1, Q2) is stored as electric energy in a snubber circuit including a capacitor and a rectifier element, and the energy stored in the capacitor is stored in the rectifier element. Since regeneration occurs when (Q1, Q2) is on, loss due to the snubber circuit can be reduced.
- the first rectifier element (Q1) is a rectifier element (rectifier side rectifier element) connected in series with a secondary winding of a transformer
- the second rectifier element (Q2) is a secondary winding.
- a rectifying element (commutation side rectifying element) connected in parallel to the first capacitor (C1) has a second end connected to a connection point between the first rectifying element (Q1) and the secondary winding. ing.
- the first rectifying element (Q1) is a rectifying element connected in series with a secondary winding of a transformer, and the second rectifying element (Q2) is connected in parallel with a secondary winding.
- the second end of the first capacitor (C1) is connected to a connection point between the second rectifier element (Q2) and the inductor.
- the switching element includes a low-side switching element and a high-side switching element that are alternately turned on / off, and the secondary winding includes a first secondary winding and a second secondary winding connected in series,
- the inductor is connected between the connection point of the first secondary winding and the second secondary winding and the positive output terminal or the negative output terminal, and the first rectifier element (Q1) is connected to the first secondary winding.
- the fifth rectifying element (D5) and the sixth rectifying element (D5) connected in series, connected in series with the second secondary winding, and connected between the positive output terminal and the negative output terminal.
- the first end is connected to the connection point of the second series circuit by the rectifying element (D6) and the fifth rectifying element (D5) and the sixth rectifying element (D6) of the second series circuit, and the second rectifying element (Q2 ) And the second secondary winding, and a second capacitor (C2) having a second end connected to the connection point of the second secondary winding. It is preferable that another snubber circuit is constituted by the second capacitor.
- a so-called center tap secondary circuit is configured on the secondary side of the transformer.
- this secondary circuit has a larger transformer leakage inductor component, so the generated surge voltage energy is high, and loss reduction due to energy regeneration in the snubber circuit High effect.
- the first rectifier element (Q1) and the second rectifier element (Q2) are, for example, a MOS-FET provided with a body diode, or a rectifier element having characteristics equivalent to a MOS-FET.
- a surge voltage generated between both ends of the first and second rectifying elements is stored as electric energy in a snubber circuit including a capacitor and a rectifying element, and the energy stored in the capacitor is stored when the rectifying element is turned on. Since regeneration is performed, consumption of surge voltage energy is avoided, and as a result, loss can be reduced.
- FIG. 1 is a circuit diagram of a switching power supply device 101 according to the first embodiment.
- FIG. 2 is a circuit diagram in which switching elements in the circuit of FIG. 1 are represented by switch symbols.
- FIG. 3 is a diagram showing the current flowing in each state of the switching power supply apparatus 101.
- FIG. 4 is a circuit diagram of the switching power supply apparatus 102 according to the second embodiment.
- FIG. 5 is a circuit diagram in which switching elements in the circuit of FIG. 4 are represented by switch symbols.
- FIG. 6 is a diagram showing the current flowing in each state of the switching power supply 102.
- FIG. 7 is a circuit diagram of the switching power supply device 103 according to the third embodiment.
- FIG. 8 is a circuit diagram in which switching elements in the circuit of FIG. 7 are represented by switch symbols.
- FIG. 8 is a circuit diagram in which switching elements in the circuit of FIG. 7 are represented by switch symbols.
- FIG. 9 is a waveform diagram of each part of the switching power supply apparatus 103 shown in FIGS.
- FIG. 10 is a diagram showing the current flowing in each state of the switching power supply device 103.
- FIG. 11 is a diagram illustrating an example of a secondary circuit of a switching power supply device including a snubber circuit disclosed in Patent Document 1. In FIG.
- FIG. 1 is a circuit diagram of a switching power supply device 101 according to the first embodiment.
- FIG. 2 is a circuit diagram in which switching elements in the circuit of FIG. 1 are represented by switch symbols.
- This switching power supply device 101 includes a transformer T having a primary winding n1 and a secondary winding n2, and a primary side including a switching element Qa that is connected to the primary winding n1 and intermittently applies a DC voltage to the primary winding n1.
- an inductor (choke coil) Lo connected between the secondary winding n2 and the output terminal Po (+), a first rectifier element Q1 for rectifying a current flowing in the secondary winding n2 and the inductor Lo, and the second A secondary side circuit including two rectifying elements Q2.
- the first rectifier element Q1 is a rectifier element on the rectification side
- the second rectifier element Q2 is a rectifier element on the commutation side.
- the forward converter circuit is configured.
- a DC power source is connected to the positive input terminal Pi (+) and the negative input terminal Pi ( ⁇ ).
- the inductor (choke coil) Lo may be connected in series to the current path between the positive output terminal Po (+) or the negative output terminal Po ( ⁇ ) and the secondary winding n2. Therefore, it may be connected between the source of the first rectifying element Q1 and the output terminal Po ( ⁇ ). The same applies to other embodiments described later.
- the input capacitor Ci is connected between the positive input terminal Pi (+) and the negative input terminal Pi ( ⁇ ) of the primary circuit.
- An output capacitor Co is connected between the positive output terminal Po (+) + and the negative output terminal Po ( ⁇ ) of the secondary circuit.
- a first series circuit including a third rectifier element D3 and a fourth rectifier element D4 is connected between the positive output terminal Po (+) and the negative output terminal Po ( ⁇ ) of the secondary circuit.
- the first end of the first capacitor C1 is connected to the connection point of the third rectifier element D3 and the fourth rectifier element D4, and the first end of the first capacitor C1 is connected to the connection point of the first rectifier element Q1 and the secondary winding n2. Two ends are connected.
- a snubber circuit 11 is constituted by the first capacitor C1, the third rectifier element D3, and the fourth rectifier element D4.
- the switching element Qa, the first rectifying element Q1, and the second rectifying element Q2 are all MOS-FETs, each having a body diode (parasitic diode) between the drain and source.
- a switching control circuit (not shown) is connected between the gate and source of the switching element Qa.
- the first rectifier element Q1 is turned on when the switching element Qa on the primary side is turned on.
- the second rectifier element Q2 is turned on when the primary side switching element Qa is turned off.
- the gate of the first rectifying element Q1 is connected to the secondary winding n2, and the gate of the second rectifying element Q2 is connected to the secondary winding n2.
- FIG. 3 is a diagram showing the current flowing in each state of the switching power supply apparatus 101.
- the operation of the switching power supply apparatus 101 is as follows.
- the surge voltage energy is stored in the first capacitor C1, the first capacitor C1, the secondary winding n2, the inductor Lo, the load, the fourth rectifying element D4, and the first capacitor C1.
- the current I2r flows through the path. Thereby, the surge voltage energy once accumulated in the first capacitor C1 is regenerated.
- the current I2c flows (commutates) through the second rectifier element Q2 by the energy stored in the inductor Lo.
- the state After that, if necessary, after passing through a dead time in which all of the switching element Qa, the first rectifying element Q1 and the second rectifying element Q2 are turned off, the state returns to the state (1).
- FIG. 4 is a circuit diagram of the switching power supply apparatus 102 according to the second embodiment.
- FIG. 5 is a circuit diagram in which switching elements in the circuit of FIG. 4 are represented by switch symbols.
- the switching power supply 102 includes a transformer T having a primary winding n1 and a secondary winding n2, and a primary side including a switching element Qa connected to the primary winding n1 and intermittently applying a DC voltage to the primary winding n1.
- the first rectifier element Q1 is a rectifier element on the rectification side
- the second rectifier element Q2 is a rectifier element on the commutation side.
- the first embodiment differs from the switching power supply device 101 shown in FIGS. 1 and 2 in the connection position of the first capacitor C1.
- the first end of the first capacitor C1 is connected to the connection point of the third rectifier element D3 and the fourth rectifier element D4, and the second rectifier element Q2 and the secondary winding are connected.
- a second end of the first capacitor C1 is connected to a connection point with n2.
- the configuration of other parts is the same as that of the switching power supply apparatus 101 shown in FIGS.
- FIG. 6 is a diagram showing the current flowing in each state of the switching power supply apparatus 102.
- the operation of the switching power supply apparatus 102 is as follows.
- the second rectifier element Q2 when the second rectifier element Q2 is turned off, a surge is generated due to the parasitic inductance of the circuit and the reverse recovery characteristic of the body diode of the second rectifier element Q2. Therefore, the current I2b flows through the path of inductor Lo ⁇ first capacitor C1 ⁇ third rectifier element D3 ⁇ inductor Lo. Thereby, surge voltage energy is accumulated in the first capacitor C1.
- the state After that, if necessary, after passing through a dead time in which all of the switching element Qa, the first rectifying element Q1 and the second rectifying element Q2 are turned off, the state returns to the state (1).
- FIG. 7 is a circuit diagram of the switching power supply device 103 according to the third embodiment.
- FIG. 8 is a circuit diagram in which switching elements in the circuit of FIG. 7 are represented by switch symbols.
- This switching power supply device 103 includes a transformer T having a primary winding n1 and secondary windings n21 and n22, a primary circuit connected to the primary winding n1, and a secondary connected to the secondary windings n21 and n22. A side circuit is provided.
- the primary circuit includes a series circuit of a high-side switching element Qa and a low-side switching element Qb, and a series circuit of capacitors Ca and Cb, which are connected between input terminals Pi (+)-Pi (-). ing.
- the primary winding n1 of the transformer T is connected between the connection point of the switching elements Qa and Qb and the connection point of the capacitors Ca and Cb.
- the secondary side circuit includes a first rectifier element Q1, a second rectifier element Q2, an inductor Lo, a third rectifier element D3, a fourth rectifier element D4, a fifth rectifier element D5, a sixth rectifier element D6, a first capacitor C1, A second capacitor C2 is provided.
- the inductor Lo is connected between the connection point of the first secondary winding n21 and the second secondary winding n22 and the output terminal Po (+).
- the first rectifier element Q1 is connected in series to the first secondary winding n21, and the second rectifier element Q2 is connected in series to the second secondary winding n22. In this way, a half bridge converter circuit is configured.
- a third series rectifier element D3 and a fourth rectifier element D4 constitute a first series circuit, and this first series circuit is connected between the positive output terminal Po (+) and the negative output terminal Po ( ⁇ ).
- a second series circuit is configured by the fifth rectifying element D5 and the sixth rectifying element D6, and this second series circuit is formed by a positive output terminal Po (+) and a negative output terminal Po ( ⁇ ). Connected between.
- the first end of the first capacitor C1 is connected to the connection point between the fifth rectifier element D5 and the sixth rectifier element D6, and the first capacitor C1 is connected to the connection point between the first rectifier element Q1 and the first secondary winding n21.
- the 2nd end of is connected.
- the first end of the second capacitor C2 is connected to the connection point between the third rectification element D3 and the fourth rectification element D4, and the second connection point between the second rectification element Q2 and the second secondary winding n22.
- a second end of the capacitor C2 is connected.
- FIG. 9 is a waveform diagram of each part of the switching power supply apparatus 103 shown in FIGS.
- FIG. 10 is a diagram showing the current flowing in each state of the switching power supply device 103.
- the operation of the switching power supply device 103 is as follows.
- the first rectifier element Q1 is turned off, and the switching element Qa and the second rectifier element Q2 are turned on, whereby a current I1f is applied to the primary winding n1 of the transformer T as shown in the state (1) of FIG.
- Current I2f flows through the secondary winding n22.
- Energy is stored in the inductor Lo by this current I2f.
- the first rectifier element Q1 is turned off by the transition from the state (4) to the state (1), a surge due to the back electromotive force of the parasitic inductance of the circuit is generated.
- the current I2b flows through the path of the secondary winding n21 ⁇ the first capacitor C1 ⁇ the fifth rectifying element D5 ⁇ the inductor Lo ⁇ the secondary winding n21. Thereby, surge voltage energy is accumulated in the first capacitor C1.
- the surge energy generated in the secondary winding n21 when the first rectifying element Q1 is turned off is absorbed by the snubber circuit 11, and the energy is regenerated immediately after. Further, the surge energy generated when the second rectifying element Q2 is turned off is absorbed by the snubber circuit 12, and the energy is regenerated immediately after.
- the configuration of the snubber circuit differs depending on the connection form (topology) of the secondary circuit of the transformer of the switching power supply device, but the positive output terminal and the negative output terminal A series circuit composed of two rectifying elements (D3, D4) or (D5, D6) connected in between, and a first end connected to a connection point of the two rectifying elements; It is common to have a capacitor (C1) or (C2) with the second end connected to one end of the end of Q1) or the second rectifier (Q2) that is not connected to the series circuit. Yes.
- the third rectifier element D3, the fourth rectifier element D4, the fifth rectifier element D5, and the sixth rectifier element D6 are each constituted by a diode. You may comprise with an element.
- the first rectifier element Q1 and the second rectifier element Q2 are configured by MOS-FETs, and are configured to perform synchronous rectification by switching in synchronization with the switching of the primary side circuit. These may be configured using a rectifying element having characteristics equivalent to a MOS-FET.
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Abstract
Description
正の出力端子と負の出力端子との間に接続され、第3整流素子(D3)および第4整流素子(D4)による第1直列回路と、
前記第3整流素子(D3)および第4整流素子(D4)の接続点に第1端が接続され、前記第1整流素子(Q1)または前記第2整流素子(Q2)の端部のうち、前記第1直列回路には繋がらない一方の端部に第2端が接続された第1容量(C1)と、を備え、
前記第1直列回路および前記第1容量によってスナバ回路が構成されたことを特徴とする。
図1は第1の実施形態に係るスイッチング電源装置101の回路図である。図2は、図1の回路内のスイッチング素子をスイッチ記号で表した回路図である。このスイッチング電源装置101は、一次巻線n1および二次巻線n2を有するトランスTと、一次巻線n1に接続され、一次巻線n1に直流電圧を断続的に与えるスイッチング素子Qaを含む一次側回路と、二次巻線n2と出力端子Po(+) との間に接続されたインダクタ(チョークコイル)Lo、二次巻線n2およびインダクタLoに流れる電流を整流する第1整流素子Q1および第2整流素子Q2を含む二次側回路と、を備える。第1整流素子Q1は整流側の整流素子、第2整流素子Q2は転流側の整流素子である。このようにしてフォワードコンバータ回路が構成されている。なお、正の入力端子Pi(+)と負の入力端子Pi(-)には、直流電源が接続されている。インダクタ(チョークコイル)Loは、正の出力端子Po(+) または負の出力端子Po(-) と二次巻線n2との間の電流経路に直列接続されていればよい。したがって、第1整流素子Q1のソースと出力端子Po(-) との間に接続されていてもよい。このことは後に示す他の実施形態についても同様である。
図4は第2の実施形態に係るスイッチング電源装置102の回路図である。図5は、図4の回路内のスイッチング素子をスイッチ記号で表した回路図である。このスイッチング電源装置102は、一次巻線n1および二次巻線n2を有するトランスTと、一次巻線n1に接続され、一次巻線n1に直流電圧を断続的に与えるスイッチング素子Qaを含む一次側回路と、二次巻線n2と出力端子Po(+) との間に接続されたインダクタ(チョークコイル)Lo、二次巻線n2およびインダクタLoに流れる電流を整流する第1整流素子Q1および第2整流素子Q2を含む二次側回路と、を備える。第1整流素子Q1は整流側の整流素子、第2整流素子Q2は転流側の整流素子である。
図7は第3の実施形態に係るスイッチング電源装置103の回路図である。図8は、図7の回路内のスイッチング素子をスイッチ記号で表した回路図である。このスイッチング電源装置103は、一次巻線n1および二次巻線n21,n22を有するトランスTと、一次巻線n1に接続された一次側回路、二次巻線n21,n22に接続された二次側回路を備えている。
C2…第2容量
Ca,Cb…コンデンサ
Ci…入力コンデンサ
Co…出力コンデンサ
D3…第3整流素子
D4…第4整流素子
D5…第5整流素子
D6…第6整流素子
Da…整流用ダイオード
Db…転流用ダイオード
Lo…インダクタ
n1…一次巻線
n2…二次巻線
n21…第1二次巻線
n22…第2二次巻線
Pi(+) …正の入力端子
Pi(-) …負の入力端子
Po(+) …正の出力端子
Po(-) …負の出力端子
Q1…第1整流素子
Q2…第2整流素子
Qa,Qb…スイッチング素子
T…トランス
11,12…スナバ回路
101,102,103…スイッチング電源装置
Claims (7)
- 一次巻線および二次巻線を有するトランスと、
前記一次巻線に接続され、前記一次巻線に直流電圧を断続的に与えるスイッチング素子を含む一次側回路と、
正の出力端子または負の出力端子と前記二次巻線との間の電流経路に直列接続されたインダクタ、前記二次巻線および前記インダクタに流れる電流を整流する第1整流素子および第2整流素子を含む二次側回路と、を備えたスイッチング電源装置において、
正の出力端子と負の出力端子との間に接続され、第3整流素子および第4整流素子による第1直列回路と、
前記第3整流素子および第4整流素子の接続点に第1端が接続され、前記第1整流素子または前記第2整流素子の端部のうち、前記第1直列回路には繋がらない一方の端部に第2端が接続された第1容量と、を備え、
前記第1直列回路および前記第1容量によってスナバ回路が構成されたことを特徴とするスイッチング電源装置。 - 前記第1整流素子は前記二次巻線に対して直列に接続された整流素子であり、前記第2整流素子は前記二次巻線に対して並列に接続された整流素子であり、
前記第1容量の第2端は前記第1整流素子と二次巻線との接続点に接続されている、請求項1に記載のスイッチング電源装置。 - 前記第1整流素子は前記二次巻線に対して直列に接続された整流素子であり、前記第2整流素子は前記二次巻線に対して並列に接続された整流素子であり、
前記第1容量の第2端は前記第2整流素子と前記インダクタとの接続点に接続されている、請求項1に記載のスイッチング電源装置。 - 前記スイッチング素子は、交互にオン/オフされるローサイドスイッチング素子およびハイサイドスイッチング素子で構成され、
前記二次巻線は、直列接続された第1二次巻線および第2二次巻線を含み、
前記第1整流素子は前記第1二次巻線に直列接続され、
前記第2整流素子は前記第2二次巻線に直列接続され、
前記正の出力端子と前記負の出力端子との間に接続された、第5整流素子および第6整流素子による第2直列回路と、
前記第5整流素子と第6整流素子との接続点に第1端が接続され、前記第2整流素子と前記第2二次巻線との接続点に第2端が接続された第2容量と、を備え、
前記第2直列回路および前記第2容量によってスナバ回路が構成された、請求項1に記載のスイッチング電源装置。 - 前記第1整流素子および前記第2整流素子は、ボディダイオードを備えたMOS-FETである、請求項1~4のいずれかに記載のスイッチング電源装置。
- 前記第3整流素子および前記第4整流素子はダイオード素子である、請求項1~5のいずれかに記載のスイッチング電源装置。
- 前記第5整流素子および第6整流素子はダイオード素子である、請求項4に記載のスイッチング電源装置。
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JP2015518226A JP6032357B2 (ja) | 2013-05-21 | 2014-05-19 | スイッチング電源装置 |
CN201480016917.9A CN105144562B (zh) | 2013-05-21 | 2014-05-19 | 开关电源装置 |
US14/881,230 US9748851B2 (en) | 2013-05-21 | 2015-10-13 | Switching power supply apparatus with snubber circuit |
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US20160036337A1 (en) | 2016-02-04 |
JPWO2014188985A1 (ja) | 2017-02-23 |
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