CN102651610A - Switch power circuit - Google Patents
Switch power circuit Download PDFInfo
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- CN102651610A CN102651610A CN201210039946XA CN201210039946A CN102651610A CN 102651610 A CN102651610 A CN 102651610A CN 201210039946X A CN201210039946X A CN 201210039946XA CN 201210039946 A CN201210039946 A CN 201210039946A CN 102651610 A CN102651610 A CN 102651610A
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Abstract
The invention provides a switch power circuit. The switch power circuit comprises a second reactor (Lr), which is in a serial connection with a first reactor (Lr); a series circuit, which is connected between one end and another end of a DC power (Vin), and is formed by connecting the first reactor, the second reactor, a first diode (D1), and a first capacitor (C1); a switch element (Q1), which is connected between a connection point between a first coil and a second coil and one end of the DC power; a series circuit, which has one end connected to a connection point between the first and the second coils, and has the other end connected to a connection point between the first diode and the first capacitor or a connection point between the second capacitor and the first diode, and is formed by a serial connection between a switch element (Q2) and the second capacitor (C2); a control circuit (10), which can be used to control the power on and power off of the switch element (Q2), whereby the breakover of the switch element (Q1) become a zero voltage switch.
Description
Technical field
The present invention relates to reduce the switching power circuit of the switching losses of switch element.
Background technology
In the past, the known switching power circuit that booster type is arranged.Fig. 9 representes an example of the switching power circuit of booster type in the past.In Fig. 9, on the two ends of DC power supply Vin, be connected with the switch element Q1 that constitutes by reactor L10 and MOSFET and the series circuit of current sense resistor R1.
Between drain electrode-source electrode of switch element Q1, be connected with the parallel circuits of diode Da and capacitor Ca.Diode Da also can be the parasitic diode of switch element Q1, and capacitor Ca also can be the capacitor parasitics of switch element Q1.
On the two ends of the series circuit of switch element Q1 and current sense resistor R1, be connected with the series circuit of reactor L20, diode D1 and capacitor C1.On the two ends of reactor L20, be connected with the switch element Q2 that constitutes by MOSFET and the series circuit of capacitor C2.Switch element Q2 and capacitor C2 have constituted active clamp circuit.
Between drain electrode-source electrode of switch element Q2, be connected with the parallel circuits of diode Db and capacitor Cb.Diode Db also can be the parasitic diode of switch element Q2, and capacitor Cb also can be the capacitor parasitics of switch element Q2.
The control that control circuit 100 is described below: according to from the voltage of capacitor C1 with from the voltage of current sense resistor R1; Make alternately on/off of switch element Q1 and switch element Q2, export the output voltage V o of the constant voltage higher than input voltage (voltage of DC power supply Vin).
The action of the switching power circuit of booster type in the past shown in Figure 9 then, is described.At first; When switch element Q1 is switched to when breaking off from connection; The energy of excitation is followed the disconnection of switch element Q1 on reactor L10 during switch element Q1 connects, be divided into via the path of switch element Q2, capacitor C2, diode D1 to capacitor C1 emit the 1st path of energy, via the 2nd path of reactor L20, diode D1.In the 2nd path, emit the energy of reactor L10, reactor L20 is carried out excitation.
In the 1st path, capacitor C2 is recharged, and the voltage of capacitor C2 rises.After capacitor Cb discharge, diode Db connect, when connecting switch element Q2, through the resonance action, in the polarity inversion of the electric current that flows through switch element Q2, capacitor C2.And; When cut-off switch element Q2; The energy of excitation is emitted on reactor L20; At the electric charge of extracting capacitor Ca through the path of reactor L20, diode D1, capacitor C1, current sense resistor R1, capacitor Ca out, connected after the diode Da, can realize the ZVT (ZVS) of switch element Q1 through turn-on switch component Q1.
[patent documentation 1] TOHKEMY 2004-201373 communique
But; Be recorded in the switching power circuit in the past of patent documentation 1; Used and made alternately on/off of switch element Q1 and switch element Q2; The energy of reactor L20 is regenerated on capacitor C2, produce active clamp circuit like the resonance current of polarity inversion, but because the charging voltage of capacitor C2 can be added to output voltage (voltage of capacitor C1); Therefore drain electrode-voltage between source electrodes of switch element Q1, Q2 becomes bigger than the voltage of capacitor C1, surpasses the withstand voltage of switch element Q1, Q2 sometimes.
Summary of the invention
The objective of the invention is to, a kind of switching power circuit efficiently is provided, its voltage that suppresses the capacitor of active clamp circuit rises, and being no more than the withstand voltage of switch element, and realizes ZVT.
In order to address the above problem, switching power circuit of the present invention is characterized in that having:
Reactor, it constitutes by the 1st reactor with the 2nd reactor that said the 1st reactor is connected in series, and the 1st reactor is formed by connecting the 1st winding with magnetic-coupled the 2nd windings in series of the 1st winding;
The 1st series circuit, it is connected between the end and the other end of DC power supply, is formed by connecting said the 1st reactor, said the 2nd reactor, the 1st diode and the 1st capacitors in series;
The 1st switch element, its be connected tie point between said the 1st winding and said the 2nd winding, and an end of said DC power supply between;
The 2nd series circuit; The one of which end is connected on the tie point between said the 1st winding and said the 2nd winding; And the other end is connected on the tie point or the tie point between said the 2nd reactor and said the 1st diode between said the 1st diode and said the 1st capacitor, is formed by connecting the 2nd switch element and the 2nd capacitors in series; And
Control circuit, its conducting with said the 1st switch element becomes the mode of ZVT, the connection of said the 2nd switch element is broken off control.
According to the present invention; When breaking off the 1st switch element; The magnetization energy of the 1st reactor is released to the 1st capacitor from the 1st winding through the 2nd switch element and the 2nd capacitor; Though the 2nd capacitor is recharged, also emit energy from the 2nd winding simultaneously, the path discharge of path or 2nd winding of the 2nd capacitor through the 2nd winding, the 2nd reactor, the 1st diode, the 2nd capacitor, the 2nd switch element, the 2nd reactor, the 2nd capacitor, the 2nd switch element; Therefore the charging voltage of the 2nd capacitor is suppressed lowly; Can not surpass the withstand voltage of the 1st and the 2nd switch element, realize the ZVT of the 1st and the 2nd switch element, switching power circuit efficiently can be provided.
Description of drawings
Fig. 1 is the structure chart of the switching power circuit of embodiments of the invention 1.
Fig. 2 is the oscillogram of action of each several part of the switching power circuit of expression embodiments of the invention 1.
Fig. 3 is the oscillogram of action of each several part of the switching power circuit of expression embodiments of the invention 1.
Fig. 4 is the figure of the current path when having represented that with thick line the each several part of the switching power circuit of embodiments of the invention 1 moves during each.
Fig. 5 is the figure of the current path when having represented that with thick line the each several part of the switching power circuit of embodiments of the invention 1 moves during each.
Fig. 6 is the structure chart of the switching power circuit of embodiments of the invention 2.
Fig. 7 is the structure chart of the switching power circuit of embodiments of the invention 3.
Fig. 8 is the structure chart of the switching power circuit of embodiments of the invention 4.
Fig. 9 be represent booster type in the past switching power circuit one the example figure.
Symbol description
Vin: DC power supply; Vac: AC power; L1: reactor; L1-1: the 1st winding of the 1st reactor; L1-2: the 2nd winding of the 1st reactor; Lr: the 2nd reactor; Q1, Q2: switch element; D1: diode; RC1: rectification circuit; R1～R3: resistance; C1～C3: capacitor; 10,10a: control circuit.
Embodiment
Below, the switching power circuit of the execution mode that present invention will be described in detail with reference to the accompanying.
[embodiment 1]
Fig. 1 is the structure chart of the switching power circuit of embodiments of the invention 1.The switching power circuit of embodiment 1 shown in Figure 1 is the boost chopper that flows through the continuous current mode that the electric current of reactor L1 flows through continuously; It is characterized in that; Structure for switching power circuit in the past shown in Figure 9; Be provided with reactor L1, this reactor L1 is by constituting like the lower part: the 1st reactor, its have the 1st winding L 1-1 and with magnetic-coupled the 2nd winding L 1-2 of the 1st winding L 1-1; And by the 2nd reactor Lr.
In addition, in Fig. 1, make reactor L1 replace reactor L10, the L20 of Fig. 9.Because other structure is identical with the structure of Fig. 9, therefore on same section, enclose identical symbol.
The 2nd reactor Lr is by constituting based on the 1st winding L 1-1 of the 1st reactor and the leakage inductance of the magnetic leakage flux between the 2nd winding L 1-2.In addition, as long as the 2nd reactor Lr has the inductance composition, can not above-mentioned leakage inductance also, reactor or saturable reactor are set separately.In addition, the turn ratio of the 1st winding L 1-1 and the 2nd winding L 1-2 can be about 10: 1.
In addition, the connection of control circuit 10 control switch element Q2 is broken off, so that the conducting of switch element Q1 becomes ZVT.
In addition, the voltage that is applied to switch element Q1, Q2 is the voltage of capacitor C1 and the voltage sum of capacitor C2.
Fig. 2 and Fig. 3 are the oscillograms of action of each several part of the switching power circuit of expression embodiments of the invention 1.Fig. 4 and Fig. 5 are the figure of the current path when having represented that with thick line the each several part of the switching power circuit of embodiments of the invention 1 moves during each.
In addition, in Fig. 4 and Fig. 5, the voltage C2v of capacitor C2 is defined as the drain side current potential of switch element Q2 just, and general+Vo side current potential is defined as 0 volt.
Then, referring to figs. 1 through Fig. 5, the action of the each several part of the switching power circuit of illustrative embodiment 1.In addition, switch element Q1 and switch element Q2 have td idle time of regulation, and quilt is on/off alternately.Fig. 4 (a) has represented initial condition.
At first, during Fig. 4 (b) among the t3, through the energy by the reactor L1 of the voltage excitation of DC power supply Vin, charge to the capacitor Ca between drain electrode-source electrode of switch element Q1 in the path of the negative pole through L1-1 → Q1 (Ca) → R1 → Vin.Therefore, the voltage Q1v between drain electrode-source electrode of switch element Q1 rises.
In addition, meanwhile, because the energy of reactor L1 also flows through on the path of the negative pole of L1-1 → Q2 (Cb) → C2 → C1 → Vin, so the voltage Q2v between drain electrode-source electrode of switch element Q2 also begins to descend.The voltage change ratio dv/dt of capacitor Ca, Cb changes with the gradient that is made up of the 1st winding L 1-1 and capacitor Ca, the time constant of Cb.
During Fig. 4 (c), among the t4, on the diode Db of switch element Q2, begin to flow through the energy of emitting of the 1st winding L 1-1.Fig. 2 and negative current Q2i shown in Figure 3 are illustrated in diode Db upper reaches overcurrent.This negative current Q2i flow through during, through signal Q2g switch element Q2 is connected, can realize the ZVT of switch element Q2.
In addition, the 2nd path of the negative pole of the 1st path of the negative pole of the positive pole → L1-1 → L1-2 → Lr → D1 → C1 → Vin through Vin and positive pole → L1-1 → Q2 → C2 → C1 → Vin of Vin, C1 emits energy to capacitor.
Among the t5, switch element Q1 breaks off during Fig. 4 (d), and switch element Q2 connects.At this moment, through the energy of reactor L1, capacitor C2 is charged via switch element Q2.Meanwhile, begin to emit the energy of the 2nd winding L 1-2, capacitor C2 is through the path discharge of L1-2 → Lr → D1 → C2 → Q2 → L1-2.
On diode D1, be connected with the 2nd winding L 1-2 and the 2nd reactor Lr, therefore the energy of emitting of the 2nd winding L 1-2 outputs to capacitor C1 when Lr carries out excitation to the 2nd reactor.Thereupon, when the charging voltage C2v of capacitor C2 rose gradually, this time capacitor C2 discharged and flows out electric current through the path of C2 → Q2 → L1-2 → Lr → D1 → C2.This can be that positive situation is known from the electric current Q2i polarity inversion of switch element Q2 also.
Among the t6, switch element Q2 breaks off through signal Q2g during Fig. 5 (a), and meanwhile, the 2nd reactor Lr begins to emit magnetization energy.The overcurrent at the upper reaches, path of Lr → D1 → C2 → Q2 (Cb) → L1-2 → Lr; Capacitor Cb is recharged with the gradient dv/dt based on the time constant of the 2nd reactor Lr and capacitor Cb gradually, the voltage of capacitor Cb, is that voltage Q2v between drain electrode-source electrode of switch element Q2 rises.
And then, through the path of Lr → D1 → C1 → R1 → Q1 (Ca) → L1-2 → Lr, the magnetization energy that begins to emit the 2nd reactor Lr.At this moment, the electric charge of the capacitor Ca of switch element Q1 is drawn out of, and the voltage Q1v of switch element Q1 descends.
During Fig. 5 (b) among the t7, through with during the identical current path of t6 flow through electric current, therefore on the diode Da of switch element Q1, flow through the energy of emitting of the 2nd reactor Lr.Fig. 2 and negative current Q1i shown in Figure 3 are illustrated in diode Da upper reaches overcurrent.Flow through negative current Q1i during, through signal Q1g switch element Q1 is connected, thereby can realize the ZVT of switch element Q1.
During Fig. 5 (c) among the t1, switch element Q1 connects, and on switch element Q1, flows through the exciting current that on the 1st winding L 1-1, flows through through DC power supply Vin, and emits the difference current between the electric current that flows through through the energy of the 2nd reactor Lr.
Among the t2, the energy of the 2nd reactor Lr is emitted end during Fig. 5 (d), and the electric current Q1i of switch element Q1 is to be flow through by the gradient of the electric current of excitation through DC power supply Vin.
In addition, as shown in Figure 3 when increasing the number of turn of the 2nd winding L 1-2 gradually, the voltage C2v of capacitor C2 also becomes negative voltage sometimes, also can make the voltage Q1v of switch element Q1, Q2, Q2v specific output voltage (voltage of capacitor C1) low.
As stated; Switching power circuit according to embodiment 1; Through cut-off switch element Q1, the magnetization energy of reactor L1 at first is released to capacitor C1 or load from the 1st winding L 1-1 through switch element Q2 and capacitor C2, and capacitor C2 is recharged; But also emit energy from the 2nd winding L 1-2 simultaneously, capacitor C2 discharges through the path of the 2nd winding L 1-2, the 2nd reactor Lr, diode D1, capacitor C2, switch element Q2.
Therefore, the charging voltage of capacitor C2 is suppressed lowly, and the drain electrode of switch element Q1, Q2-voltage between source electrodes Vds can not surpass withstand voltage.Promptly, through the 2nd winding L 1-2 is set; Carry out the discharge of capacitor C2 energetically; The withstand voltage situation of switch element that surpasses that can not occur causing by the rising of the voltage of capacitor C2, and can realize the ZVT of switch element Q1, Q2 switching power circuit efficiently being provided.
[embodiment 2]
Fig. 6 is the structure chart of the switching power circuit of embodiments of the invention 2.In embodiment shown in Figure 62, it is characterized in that, the 2nd winding L 1-2, the 2nd reactor Lr, capacitor C2 and switch element Q2 are connected into closed circuitly constitute.
In addition, Fig. 6 has changed the connection of the capacitor C2 of Fig. 1.Because other structure is identical with the structure of Fig. 1, therefore same section has been enclosed same-sign.
Even aforesaid structure also can access action and identical action and the effect of effect with the switching power circuit of embodiment shown in Figure 11.
[embodiment 3]
Fig. 7 is the structure chart of the switching power circuit of embodiments of the invention 3.In embodiment shown in Figure 73, it is characterized in that, be provided with the buffer circuit that constitutes by diode D2, D3 and capacitor C3.
In addition, among Fig. 7, diode D2, D3, capacitor C3 have been increased for Fig. 1.Because other structure is identical with the structure of Fig. 1, therefore same section has been enclosed same-sign.
On the anode of diode D1, be connected with the end of capacitor C3, on the other end of capacitor C3, be connected with the anode of diode D2 and the negative electrode of diode D3.The anode of diode D3 is connected the end, lead-out terminal of negative pole, the capacitor C1 of DC power supply Vin (Vo) with the end of current sense resistor R1.The negative electrode of diode D2 is connected the other end of capacitor C1, the negative electrode of diode D1 and the end of capacitor C2.
According to above structure; When connecting switch element Q1; On the 1st winding L 1-1, be applied with the voltage of DC power supply Vin; Therefore the coupling of the 1st winding L 1-1 and the 2nd winding L 1-2 magnetic produces the voltage of Vin * (number of turn of L1-2)/(number of turn of L1-1) on the 2nd winding L 1-2, with addition the voltage of this voltage and output voltage V o be applied on the diode D1.At this moment, through extracting the stored charge of diode D1 out, on diode D1, produce surge voltage sometimes.
At this moment, the voltage that on the 2nd winding L 1-2, produces is through capacitor C3, diode D2 and capacitor C1 is charged.In addition, diode D3 uses when negative voltage.Therefore, the voltage that is applied to diode D1 reduces, and on diode D1, can not produce surge voltage.Promptly, owing to increased the free of losses buffer circuit of diode D2, D3 and capacitor C3, can suppress the withstand voltage of diode D1.
[embodiment 4]
The switching power circuit of embodiment 4 shown in Figure 8 is characterised in that, replaces the DC power supply Vin of switching power circuit shown in Figure 1 to be provided with the pfc circuit (power factor correction circuit) of AC power Vac and rectification circuit RC1.
AC power Vac supplies to rectification circuit RC1 with alternating voltage.Rectification circuit RC1 carries out rectification to the alternating voltage from AC power Vac.
According to the switching power circuit of aforesaid embodiment 4, when improving power factor, carry out the identical action of action with the switching power circuit of embodiment 1, can access identical effect.
The present invention can use in DC-DC transducer, power factor correction circuit and AC-DC transducer.
Claims (5)
1. switching power circuit is characterized in that having:
Reactor, it constitutes by the 1st reactor with the 2nd reactor that said the 1st reactor is connected in series, and wherein, the 1st reactor is formed by connecting the 1st winding with magnetic-coupled the 2nd windings in series of the 1st winding;
The 1st series circuit, it is connected between the end and the other end of DC power supply, is formed by connecting said the 1st reactor, said the 2nd reactor, the 1st diode and the 1st capacitors in series;
The 1st switch element, its be connected tie point between said the 1st winding and said the 2nd winding, and an end of said DC power supply between;
The 2nd series circuit; The one of which end is connected on the tie point between said the 1st winding and said the 2nd winding; And the other end is connected on the tie point or the tie point between said the 2nd reactor and said the 1st diode between said the 1st diode and said the 1st capacitor, is formed by connecting the 2nd switch element and the 2nd capacitors in series; And
Control circuit, its conducting with said the 1st switch element becomes the mode of ZVT, the connection of said the 2nd switch element is broken off control.
2. switching power circuit according to claim 1 is characterized in that,
Said the 2nd reactor is said the 1st winding of said the 1st reactor and the leakage inductance between said the 2nd winding.
3. switching power circuit according to claim 1 is characterized in that,
Said the 2nd reactor is a saturable reactor.
4. switching power circuit according to claim 1 is characterized in that,
On said the 1st diode, be connected with buffer circuit.
5. according to any described switching power circuit in the claim 1 to 4, it is characterized in that,
Said DC power supply is made up of AC power and rectification circuit, and said control circuit is carried out the control that improves power factor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2011-041651 | 2011-02-28 | ||
| JP2011041651A JP2012178952A (en) | 2011-02-28 | 2011-02-28 | Switching power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102651610A true CN102651610A (en) | 2012-08-29 |
Family
ID=46693516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210039946XA Pending CN102651610A (en) | 2011-02-28 | 2012-02-20 | Switch power circuit |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2012178952A (en) |
| CN (1) | CN102651610A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103812331A (en) * | 2012-11-14 | 2014-05-21 | 财团法人工业技术研究院 | Direct current conversion circuit |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7051727B2 (en) | 2019-01-24 | 2022-04-11 | 株式会社京三製作所 | DC pulse power supply |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020185993A1 (en) * | 2001-06-07 | 2002-12-12 | Philips Electronics North America Corporation. | Active clamp step-down converter with power switch voltage clamping function |
| CN1411130A (en) * | 2001-09-28 | 2003-04-16 | 三垦电气株式会社 | Switch power supply unit |
| US20030205990A1 (en) * | 2002-05-01 | 2003-11-06 | Wittenbreder, Ernest H. | Circuits and circuit elements for high efficiency power conversion |
| CN1551470A (en) * | 2003-05-16 | 2004-12-01 | 株式会社村田制作所 | Switching power supply apparatus |
| US20090262557A1 (en) * | 2008-04-16 | 2009-10-22 | Sanken Electric Co., Ltd. | Bi-directional dc-dc converter |
| CN101882865A (en) * | 2010-07-01 | 2010-11-10 | 燕山大学 | Power factor correction converter based on magnetic coupling lossless buffer circuit |
-
2011
- 2011-02-28 JP JP2011041651A patent/JP2012178952A/en not_active Withdrawn
-
2012
- 2012-02-20 CN CN201210039946XA patent/CN102651610A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020185993A1 (en) * | 2001-06-07 | 2002-12-12 | Philips Electronics North America Corporation. | Active clamp step-down converter with power switch voltage clamping function |
| CN1411130A (en) * | 2001-09-28 | 2003-04-16 | 三垦电气株式会社 | Switch power supply unit |
| US20030205990A1 (en) * | 2002-05-01 | 2003-11-06 | Wittenbreder, Ernest H. | Circuits and circuit elements for high efficiency power conversion |
| CN1551470A (en) * | 2003-05-16 | 2004-12-01 | 株式会社村田制作所 | Switching power supply apparatus |
| US20090262557A1 (en) * | 2008-04-16 | 2009-10-22 | Sanken Electric Co., Ltd. | Bi-directional dc-dc converter |
| CN101882865A (en) * | 2010-07-01 | 2010-11-10 | 燕山大学 | Power factor correction converter based on magnetic coupling lossless buffer circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103812331A (en) * | 2012-11-14 | 2014-05-21 | 财团法人工业技术研究院 | Direct current conversion circuit |
| CN103812331B (en) * | 2012-11-14 | 2016-09-21 | 财团法人工业技术研究院 | Direct current conversion circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2012178952A (en) | 2012-09-13 |
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Application publication date: 20120829 |