CN102624235A - DC (Direct Current)/DC conversion circuit - Google Patents
DC (Direct Current)/DC conversion circuit Download PDFInfo
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- CN102624235A CN102624235A CN2012100538053A CN201210053805A CN102624235A CN 102624235 A CN102624235 A CN 102624235A CN 2012100538053 A CN2012100538053 A CN 2012100538053A CN 201210053805 A CN201210053805 A CN 201210053805A CN 102624235 A CN102624235 A CN 102624235A
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- conversion circuit
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Abstract
The invention provides a DC (Direct Current)/DC conversion circuit. The DC/DC conversion circuit comprises a transformer, a switch, a first capacitor, a first diode and a second diode; the transformer comprises a primary coil and a secondary coil; the switch is used for receiving a switch control signal; and the second diode is used for being coupled with a load. When the switch is enabled according to the switch control signal, the primary coil and the first capacitor store energy; and when the switch is switched off according to the switch control signal, the primary coil and the first capacitor release the energy to the load. Compared with the prior art, the DC/DC conversion circuit has the characteristics of both a forward conversion circuit and a flyback conversion circuit, so that the conversion efficiency can be effectively improved by the DC/DC conversion circuit.
Description
Technical field
The present invention refers to a kind of DC/DC conversion circuit that has forward type change-over circuit and flyback change-over circuit simultaneously especially relevant for a kind of DC/DC conversion circuit.
Background technology
Formerly in the technology, the DC/DC conversion circuit mainly contains forward type change-over circuit (forward transformer) and flyback change-over circuit (flyback transformer).Generally speaking, because the forward type change-over circuit utilizes primary coil directly the energy of input to be sent to secondary coil, the conversion efficiency of forward type change-over circuit is better.But the shortcoming of forward type change-over circuit is that the turn ratio of primary coil and secondary coil must be greater than the step-up ratio of forward type change-over circuit.For example, when the step-up ratio of forward type change-over circuit was N, the primary coil of forward type change-over circuit and the turn ratio M of secondary coil must be greater than N.
On the other hand, the turn ratio of the primary coil of flyback change-over circuit and secondary coil can be less than the step-up ratio of flyback change-over circuit.For example, when the step-up ratio of flyback change-over circuit was N, the primary coil of flyback change-over circuit and the turn ratio L of secondary coil can be less than N.But the flyback change-over circuit is when transmitting energy to the secondary coil of input, and the energy of input is stored in the inductance earlier, and then reaches secondary coil.Because inductor loss is bigger, so the shortcoming of flyback change-over circuit is that conversion efficiency is relatively poor.
Summary of the invention
In view of the above problems, one embodiment of the invention provide a kind of DC/DC conversion circuit.This DC/DC conversion circuit comprises transformer, switch, first electric capacity, first diode and second diode.This transformer comprises primary coil and secondary coil; This primary coil has first end, in order to receive input voltage, reaches second end; This secondary coil has first end, and second end.This switch has first end, is coupled to second end of this primary coil, second end, and in order to the receiving key control signal, and the 3rd end.This first electric capacity has first end, is coupled to second end of this secondary coil, and second end.This first diode has first end, is coupled to first end of this secondary coil, and second end, is coupled to second end of this first electric capacity.This second diode has first end, in order to couple load, reaches second end, is coupled to first end of this first diode.When this switch conduction, this primary coil and this first electric capacity storage power, when this switch cut out, this primary coil and this first electric capacity discharged this energy to this load.
According to above-mentioned DC/DC conversion circuit, other comprises clamp circuit, and this clamp circuit is coupled to this primary coil and this switch, in order to when this switch cuts out, reclaims the energy of this primary coil of this transformer.
According to above-mentioned DC/DC conversion circuit, this clamp circuit comprises the 3rd diode, second electric capacity, the 4th diode and inductance, and the 3rd diode has first end, is coupled to first end of this primary coil, and second end; This second electric capacity has first end, is coupled to second end of the 3rd diode, and second end, is coupled to first end of this switch; The 4th diode has first end, is coupled to first end of this second electric capacity, and second end; This inductance has first end, is coupled to second end of the 4th diode, and second end, is coupled to the 3rd end of this switch.
According to above-mentioned DC/DC conversion circuit; When this switch according to this switch controlling signal open period; This second electric capacity produces inductance capacitance vibration with this inductance, with the current potential of first end of the current potential of second end that changes this second electric capacity and second electric capacity, and when this switch cuts out according to this switch controlling signal; Be stored in the energy of the parasitic capacitance of this switch, be sent to this input voltage through this second electric capacity and the 3rd diode.
According to above-mentioned DC/DC conversion circuit, this switch controlling signal is a pulse-width signal.
According to above-mentioned DC/DC conversion circuit, transformer is isolated transformer.
According to above-mentioned DC/DC conversion circuit, when this switch conduction, be the forward type change-over circuit, when this switch cuts out, be the flyback change-over circuit.
The present invention provides a kind of DC/DC conversion circuit.Compared to prior art; This DC/DC conversion circuit is because have the characteristic of forward type change-over circuit and flyback change-over circuit simultaneously; So the present invention has advantage: the first, when switch conduction; Have corresponding to the characteristic of this forward type change-over circuit and characteristic because flow through the electric current of primary coil,, the conversion efficiency of this DC/DC conversion circuit is improved so it is over time little to flow through the electric current of this primary coil corresponding to this flyback change-over circuit; The second, when this switch conduction, because the portion of energy of input voltage is stored in the magnetizing inductance in this primary coil, and another part energy storage of this input voltage is at first electric capacity, so the energy loss of this DC/DC conversion circuit is less; Three, because the present invention has the characteristic of this forward type change-over circuit and the characteristic of this flyback change-over circuit simultaneously; So the number of turn of this forward type change-over circuit of turn ratio of the present invention is few, and conversion efficiency of the present invention is higher than the conversion efficiency of this flyback change-over circuit; Four,,, cause the conversion efficiency of this DC/DC conversion circuit to improve so when this switch cut out according to the switch controlling signal, this switch had the zero voltage switching characteristic because in the another embodiment of the present invention, have clamp circuit.
Description of drawings
Fig. 1 explains a kind of sketch map of DC/DC conversion circuit for one embodiment of the invention.
Fig. 2 is the sketch map of the DC/DC conversion circuit of explanation when switch cuts out.
Fig. 3 explains a kind of sketch map of DC/DC conversion circuit for another embodiment of the present invention.
Fig. 4 is the sketch map of the clamp circuit of explanation when switch cuts out.
Fig. 5 is for explaining that clamp circuit has the sketch map of zero voltage switching characteristic by switch when switch cuts out according to switch controlling signal.
Embodiment
Please with reference to Fig. 1, Fig. 1 explains a kind of sketch map of DC/DC conversion circuit 100 for one embodiment of the invention.As shown in Figure 1; DC/DC conversion circuit 100 comprises transformer 102, switch 104, first electric capacity 106, first diode 108 and second diode 110; Wherein transformer 102 is selected isolated transformer in order to comply with market mainstream demand, but the present invention is as limit, and transformer 102 comprises primary coil 1022 and secondary coil 1024; And the turn ratio of primary coil 1022 and secondary coil 1024 is 1: N, N are the constant greater than 0.Primary coil 1022 has first end, in order to receive input voltage VIN, reaches second end; Secondary coil 1024 has first end, and second end.Switch 104 has first end, is coupled to second end of primary coil 1022, second end, and in order to receiving key control signal SCS, and the 3rd end, wherein switch controlling signal SCS is a pulse-width signal.In addition, the work period of switch controlling signal SCS is D, and D is between 0 and 1.First electric capacity 106 has first end, is coupled to second end of secondary coil 1024, and second end.Diode 108 has first end, is coupled to first end of secondary coil 1024, and second end, is coupled to second end of first electric capacity 106.Second diode 110 has first end, is coupled to load 112, and second end, is coupled to first end of first diode 108.
As shown in Figure 1, when switch 104 conductings (ON), secondary coil 1024 is (forward) pattern forward.At this moment, electric current I PF flows through primary coil 1022, and current IS FO flows through secondary coil 1024 and to 106 chargings of first electric capacity, therefore, the energy of input voltage VIN is stored in the magnetizing inductance and first electric capacity 106 in the primary coil 1022.
Please with reference to Fig. 2, Fig. 2 is the sketch map of the DC/DC conversion circuit 100 of explanation when switch 104 cuts out (OFF).As shown in Figure 2, when switch 104 cut out (OFF), secondary coil 1024 was that flyback (flyback) pattern and the electric current I PF that flows through primary coil 1022 reduce to zero.Because primary coil 1022 is opposite with the polarity of secondary coil 1024; So secondary coil 1024 can be because the magnetic flux change in the secondary coil 1024; Produce and the reverse current IS F1 of current IS F0, and can the be coupled portion of energy of the interior stored input voltage VIN of magnetizing inductance of primary coil 1022 of secondary coil 1024.Therefore; Secondary coil 1024 can the magnetizing inductance in the primary coil 1022 is stored another part energy of the stored input voltage VIN of portion of energy and first electric capacity 106 of input voltage VIN; Be released into load 112 through current IS F1, wherein can produce according to formula (1) according to the output voltage VO that current IS F1 produced in order to drive load 112.
VIN*D＝(VO-N*VIN)/N)*(1-D) (1)
Can know by formula (1),, then also can confirm in order to the output voltage VO that drives load 112 if the work period D of switch controlling signal SCS, input voltage VIN and primary coil 1022 are definite with the turn ratio of secondary coil 1024.
Please with reference to Fig. 3, Fig. 3 explains a kind of sketch map of DC/DC conversion circuit 300 for another embodiment of the present invention.The difference of DC/DC conversion circuit 300 and DC/DC conversion circuit 100 is that DC/DC conversion circuit 300 comprises clamp circuit 314 in addition; Wherein clamp circuit 314 is coupled to first end of primary coil 1022 and first end and the 3rd end of switch 104; In order to when switch 104 cuts out, reclaim the energy of the primary coil 1022 of transformer 102.Clamp circuit 314 comprises the 3rd diode 3142, second electric capacity 3144, the 4th diode 3146 and inductance 3148.But the present invention is not limited to the clamp circuit 314 of Fig. 3.The 3rd diode 3142 has first end, is coupled to first end of primary coil 1022, and second end; Second electric capacity 3144 has first end, is coupled to second end of the 3rd diode 3142, and second end, is coupled to first end of switch 104; The 4th diode 3146 has first end, is coupled to first end of second electric capacity 3144, and second end; Inductance 3148 has first end, is coupled to second end of the 4th diode 3146, and second end, is coupled to the 3rd end of switch 104.
As shown in Figure 3, when switch 104 was opened (ON) according to switch controlling signal SCS, second electric capacity 3144 produced the inductance capacitances vibration with inductance 3148, that is second electric capacity 3144, switch 104, inductance 3148 and the 4th diode 3146 form discharge paths.Therefore; In the discharge process of second electric capacity 3144; The current potential of second end of second electric capacity 3144 transfers negative potential to by positive potential (closing corresponding to a preceding switch 104) gradually, and the current potential of first end of second electric capacity 3144 transfers positive potential to by negative potential (closing corresponding to a preceding switch 104) gradually.
Please with reference to Fig. 4, Fig. 4 is the sketch map of the clamp circuit 314 of explanation when switch 104 cuts out (OFF).As shown in Figure 4; When switch 104 cuts out (OFF) according to switch controlling signal SCS; Flow through the electric current of primary coil 1022 simultaneously to the parasitic capacitance of switch 104 and 3144 chargings of second electric capacity, the current potential of second end of second electric capacity 3144 that raises (at this moment, the current potential of second end of second electric capacity 3144 is a negative potential); Cause the current potential (at this moment, the current potential of first end of second electric capacity 3144 is a positive potential) of first end of second electric capacity 3144 also to be raised.Therefore, when the potential rise of first end of second electric capacity 3144 is high enough to conducting the 3rd diode 3142, be stored in the energy of the parasitic capacitance of switch 104, can be sent to input voltage VIN through second electric capacity 3144 and the 3rd diode 3142.Then, the current potential of second end of second electric capacity 3144 transfers positive potential to by negative potential gradually, and the current potential of first end of second electric capacity 3144 transfers negative potential to by positive potential gradually.Because when switch 104 cuts out (OFF) according to switch controlling signal SCS, the electric current of the primary coil 1022 of flowing through is simultaneously to the parasitic capacitance of switch 104 and 3144 chargings of second electric capacity, so the voltage at switch 104 two ends is can instantaneous variation inviolent.Please with reference to Fig. 5, Fig. 5 is for explaining that clamp circuit 314 lets switch 104 have the sketch map of zero voltage switching characteristic when switch 104 cuts out (OFF) according to switch controlling signal SCS.As shown in Figure 5; When switch 104 cuts out (OFF) according to switch controlling signal SCS; Because the leakage inductance energy that clamp circuit 314 reclaims primary coil 1022 is to input voltage VIN, so the voltage VDS at switch 104 two ends variation is milder, that is when switch 104 cuts out (OFF) according to switch controlling signal SCS; Switch 104 has the zero voltage switching characteristic, causes the conversion efficiency of DC/DC conversion circuit 300 to improve.
In sum; Compared to prior art; DC/DC conversion circuit provided by the present invention is because have the characteristic of forward type change-over circuit and flyback change-over circuit simultaneously; So the present invention has advantage: the first, when switch conduction; Have simultaneously corresponding to the electric current of forward type transfer characteristic and electric current because flow through the electric current of primary coil,, cause the conversion efficiency of DC/DC conversion circuit to improve so it is over time little to flow through the electric current of primary coil corresponding to the flyback transfer characteristic; The second, when switch conduction, because the portion of energy of input voltage is stored in the magnetizing inductance in the primary coil, and another part energy storage of input voltage is at first electric capacity, so the energy loss of DC/DC conversion circuit is less; Three, because the present invention has the characteristic of forward type change-over circuit and flyback change-over circuit simultaneously, so turn ratio forward type change-over circuit of the present invention is little, and conversion efficiency of the present invention is higher than flyback change-over circuit; Four,,, cause the conversion efficiency of DC/DC conversion circuit to improve so when switch cut out according to the switch controlling signal, switch had the zero voltage switching characteristic because another embodiment of the present invention has clamp circuit.
The above is merely preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (6)
1. a DC/DC conversion circuit is characterized in that, comprises:
Transformer comprises:
Primary coil has first end, in order to receive input voltage, reaches second end; And
Secondary coil has first end, and second end;
Switch has first end, is coupled to second end of this primary coil, second end, and in order to the receiving key control signal, and the 3rd end;
First electric capacity has first end, is coupled to second end of this secondary coil, and second end;
First diode has first end, is coupled to first end of this secondary coil, and second end, is coupled to second end of this first electric capacity; And
Second diode has first end, in order to couple load, reaches second end, is coupled to first end of this first diode;
Wherein when this switch conduction, this primary coil and this first electric capacity storage power, when this switch cut out, this primary coil and this first electric capacity discharged this energy to this load.
2. DC/DC conversion circuit according to claim 1 is characterized in that other comprises:
Clamp circuit is coupled to this primary coil and this switch, in order to when this switch cuts out, reclaims the energy of this primary coil of this transformer.
3. like request 2 described DC/DC conversion circuit, it is characterized in that this clamp circuit comprises:
The 3rd diode has first end, is coupled to first end of this primary coil, and second end;
Second electric capacity has first end, is coupled to second end of the 3rd diode, and second end, is coupled to first end of this switch;
The 4th diode has first end, is coupled to first end of this second electric capacity, and second end; And
Inductance has first end, is coupled to second end of the 4th diode, and second end, is coupled to the 3rd end of this switch.
4. DC/DC conversion circuit according to claim 3; It is characterized in that, when this switch according to this switch controlling signal open period, this second electric capacity produces inductance capacitance vibration with this inductance; Current potential with first end of the current potential of second end that changes this second electric capacity and second electric capacity; And when this switch cuts out according to this switch controlling signal, be stored in the energy of the parasitic capacitance of this switch, be sent to this input voltage through this second electric capacity and the 3rd diode.
5. DC/DC conversion circuit according to claim 1 is characterized in that, this switch controlling signal is a pulse-width signal.
6. DC/DC conversion circuit according to claim 1 is characterized in that, this transformer is isolated transformer.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101104181A TW201334387A (en) | 2012-02-09 | 2012-02-09 | Direct current/direct current converter |
| CN2012100538053A CN102624235A (en) | 2012-02-09 | 2012-03-02 | DC (Direct Current)/DC conversion circuit |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW101104181A TW201334387A (en) | 2012-02-09 | 2012-02-09 | Direct current/direct current converter |
| CN2012100538053A CN102624235A (en) | 2012-02-09 | 2012-03-02 | DC (Direct Current)/DC conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102624235A true CN102624235A (en) | 2012-08-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100538053A Pending CN102624235A (en) | 2012-02-09 | 2012-03-02 | DC (Direct Current)/DC conversion circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102624235A (en) |
| TW (1) | TW201334387A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104717784A (en) * | 2013-12-13 | 2015-06-17 | 台达电子企业管理（上海）有限公司 | Light source drive circuit |
| TWI731675B (en) * | 2020-05-11 | 2021-06-21 | 宏碁股份有限公司 | Power supply device for eliminating ringing effect |
| CN113938014A (en) * | 2020-07-13 | 2022-01-14 | 宏碁股份有限公司 | Power supply for eliminating ringing effect |
| US11764689B2 (en) | 2019-02-01 | 2023-09-19 | Chicony Power Technology Co., Ltd. | Flyback power-converting device with zero-voltage switching and method for flyback converting power with zero-voltage switching |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI495239B (en) * | 2013-11-01 | 2015-08-01 | Univ Nat Taipei Technology | Voltage converter combined with one bootstrap capacitor and one coupled inductor |
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| CN1545195A (en) * | 2003-11-19 | 2004-11-10 | 南京航空航天大学 | Positive and negative excitation bidirectional DC-DC converter |
| CN2917083Y (en) * | 2005-11-04 | 2007-06-27 | 周春香 | Normal/reverse excitation combined DC/DC isolated transformer |
| CN101854188A (en) * | 2004-01-29 | 2010-10-06 | 桥扬科技有限公司 | The method and apparatus that is used for multicarrier, multi-cell wireless communication networks |
| CN201854188U (en) * | 2010-11-23 | 2011-06-01 | 中国电子科技集团公司第三十八研究所 | Simple and efficient DC/DC positive and negative forward converter |
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2012
- 2012-02-09 TW TW101104181A patent/TW201334387A/en unknown
- 2012-03-02 CN CN2012100538053A patent/CN102624235A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1545195A (en) * | 2003-11-19 | 2004-11-10 | 南京航空航天大学 | Positive and negative excitation bidirectional DC-DC converter |
| CN101854188A (en) * | 2004-01-29 | 2010-10-06 | 桥扬科技有限公司 | The method and apparatus that is used for multicarrier, multi-cell wireless communication networks |
| CN2917083Y (en) * | 2005-11-04 | 2007-06-27 | 周春香 | Normal/reverse excitation combined DC/DC isolated transformer |
| CN201854188U (en) * | 2010-11-23 | 2011-06-01 | 中国电子科技集团公司第三十八研究所 | Simple and efficient DC/DC positive and negative forward converter |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104717784A (en) * | 2013-12-13 | 2015-06-17 | 台达电子企业管理（上海）有限公司 | Light source drive circuit |
| CN104717784B (en) * | 2013-12-13 | 2018-09-14 | 台达电子企业管理（上海）有限公司 | Light source driving circuit |
| US10111284B2 (en) | 2013-12-13 | 2018-10-23 | Delta Electronics (Shanghai) Co., Ltd. | Light driving circuit |
| US11764689B2 (en) | 2019-02-01 | 2023-09-19 | Chicony Power Technology Co., Ltd. | Flyback power-converting device with zero-voltage switching and method for flyback converting power with zero-voltage switching |
| TWI731675B (en) * | 2020-05-11 | 2021-06-21 | 宏碁股份有限公司 | Power supply device for eliminating ringing effect |
| US11171567B1 (en) | 2020-05-11 | 2021-11-09 | Acer Incorporated | Power supply device for eliminating ringing effect |
| CN113938014A (en) * | 2020-07-13 | 2022-01-14 | 宏碁股份有限公司 | Power supply for eliminating ringing effect |
| CN113938014B (en) * | 2020-07-13 | 2023-07-21 | 宏碁股份有限公司 | Power supply device for eliminating ringing effect |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201334387A (en) | 2013-08-16 |
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Application publication date: 20120801 |