CN100440703C - Flexible-switching DC-DC converter - Google Patents
Flexible-switching DC-DC converter Download PDFInfo
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- CN100440703C CN100440703C CNB2005100844082A CN200510084408A CN100440703C CN 100440703 C CN100440703 C CN 100440703C CN B2005100844082 A CNB2005100844082 A CN B2005100844082A CN 200510084408 A CN200510084408 A CN 200510084408A CN 100440703 C CN100440703 C CN 100440703C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
A direct-current-direct-current transducer with flexible switch, it includes: the switch circuit, the syntony circuit and the energy leading circuit; the switch circuit with the main switch that uses to transform the direct-current voltage into outputting direct-current; the syntony circuit electric connects with the switch circuit, breaks over the main switch by the syntony circuit at the condition of the main switch is at a special voltage; the energy leading circuit with the assistant switch and magnet coupling with the syntony circuit, closes the assistant switch by the syntony circuit at the condition of the assistant switch is with a special current, achieves the flexible switch of the main switch and the assistant switch. The direct-current-direct-current transducer of the invention can use the syntony circuit to achieve the main switch zero voltage of the direct-current-direct-current circuit, and the near zero current switch of the energy leading circuit assistant sequence transistor switch, reduces the switch losing of the general direct-current-direct-current transducer.
Description
Technical field
The present invention relates to a kind of pulse-width modulation (PWM) DC-to-DC change-over circuit, the DC-to-DC converter that particularly a kind of flexibility of using the zero-voltage zero-current technology is switched.
Background technology
See also Fig. 1, be the buck direct current of pulse-width modulation (PWM) commonly used-from the circuit diagram of stream transformer (BuckConverter).Wherein, buck DC-to-DC converter 100 is made of main switch 101, primary input electric capacity 102, main inductance 103, main diode 104, main output capacitance 105 and load Load; Utilize the conducting of main switch 101 and the switching of closing, and the direct voltage V1 step-down of input is produced output dc voltage V2 (not shown) on load Load.
The How It Works of the buck DC-to-DC converter 100 among Fig. 1 is: when main switch 101 conductings (on), input direct voltage V1 charges with cumlative energy to main inductance 103 and main output capacitance 105, and this moment, main diode 104 ended because of reverse biased; And when main switch 101 ends (off), main diode 104 conductings, the voltage of main inductance 103 is to main output capacitance 105 chargings.Therefore, by main switch 101 periodic conductings with end, just can on load Load, produce output dc voltage V2.
In Fig. 1, suppose that main output capacitance 105 is very big, then in theory main switch 101 can be fast and periodically conducting with close (on-off), make main inductance 103 cumlative energies, so that at any time to main output capacitance 105 makeup energy.Therefore, main output capacitance 105 is just sustainable keeps a fixed voltage and is not subjected to the influence of load variations.
Yet this buck DC-to-DC converter 100 has following two problems at least:
(1) when main switch 101 switches, reverse recovery current on the main diode 104 (reverserecovery current) can make main switch 101 and main diode 104 produce serious switch cost, so that can't be by improving the size that switching frequency reduces this buck DC-to-DC converter 100 employed inductance.
(2) in main switch 101 and main diode 104 handoff procedures, can produce serious voltage and electric current and change, cause the generation of electromagnetic interference (EMI) and radio frequency interference problems such as (RFI).
Summary of the invention
Purpose of the present invention is for providing a kind of flexible DC-to-DC converter of switching, utilize resonant circuit to make the main switch of DC-to-DC change-over circuit carry out zero voltage switching, this resonant circuit also magnetic flux is coupled in energy guiding circuit, can make the auxiliary forward transistor switch of energy guiding circuit realize being similar to the switching of zero current by the resonance effect, reduce the switch cost of DC-to-DC converter commonly used.
According to above-mentioned purpose, a kind of flexible DC-to-DC converter of switching is provided, comprising: change-over circuit, have main switch, this change-over circuit is in order to convert input direct voltage to output dc voltage; Resonant circuit is electrically connected on this change-over circuit, and this resonant circuit is in this main switch of conducting under the situation of a specific voltage at this main switch by the resonance effect; And energy guiding circuit, has auxiliary switch, this energy guiding circuit magnetic flux is coupled in this resonant circuit, and has at this auxiliary switch by the resonance effect under the situation of a specific currents and close this auxiliary switch, switches with the flexibility of finishing this main switch and this auxiliary switch.
Described DC-to-DC converter, wherein: this main switch comprises transistor: and/or this auxiliary switch comprises transistor.
Described DC-to-DC converter, wherein: this change-over circuit comprises the buck change-over circuit; And/or this buck change-over circuit is made of main inductance, main diode and main output capacitance, one end of this main inductance is connected in an end of this main switch and the cathode terminal of this main diode, the other end of this main inductance is connected in an end of this main output capacitance and the output of this DC-to-DC converter, and the anode tap of this main diode is connected in the other end of this main output capacitance and the output of this DC-to-DC converter.
Described DC-to-DC converter, wherein: this change-over circuit comprises the boost type change-over circuit; And/or this boost type change-over circuit is made of main inductance, main diode and main output capacitance, one end of this main inductance is connected in the input of DC-to-DC converter, the other end of this main inductance is connected in an end of this main switch and the anode tap of this main diode, the cathode terminal of this main diode is connected in an end of this main output capacitance and the output of this DC-to-DC converter, and the other end of this main output capacitance is connected in the other end of this main switch and the output of this DC-to-DC converter.
Described DC-to-DC converter, wherein: this change-over circuit comprises liter-buck change-over circuit; And/or this liter-buck change-over circuit is made of main inductance, main diode and main output capacitance, one end of this main inductance is connected in an end of this main switch and the cathode terminal of this main diode, the anode tap of this main diode is connected in an end of this main inductance and the output of this DC-to-DC converter, and the other end of this main inductance is connected in the other end of this main inductance and the output of this DC-to-DC converter.
Described DC-to-DC converter, wherein this resonant circuit is made of secondary side, resonance inductor, resonance diode and the free-wheel diode of transformer, the cathode terminal of this resonance diode is connected in an end of the secondary side of this transformer, the other end of the secondary side of this transformer is connected in the cathode terminal of this free-wheel diode and an end of this resonance inductor, and the anode tap of this resonance diode is connected in the anode tap of this free-wheel diode.
Described DC-to-DC converter, wherein this energy guiding circuit: magnetic flux is connected in this resonant circuit; Or be connected in parallel in the output of this DC-to-DC converter.
Described DC-to-DC converter, wherein this energy guiding circuit is by this auxiliary switch, clamp diode, the primary side of transformer, clamp capacitor and discharge resistance constitute, one end of this discharge resistance is connected in the input of this DC-to-DC converter, one end of one end of this clamp capacitor and the primary side of this transformer, the other end of this discharge resistance is connected in the other end of this clamp capacitor and the cathode terminal of this clamp diode, the anode tap of this clamp diode is connected in the other end of primary side of this transformer and an end of this auxiliary switch, and the other end of this auxiliary switch is connected in the input and the output of this DC-to-DC converter.
Described DC-to-DC converter, wherein: this energy guiding circuit comprises pair transistor forward type DC-to-DC change-over circuit; And/or this pair transistor forward type DC-to-DC change-over circuit is by the first transistor, transistor seconds, first diode, the primary side of second diode and transformer constitutes, the anode tap of this first diode is connected in an end of this first transistor and the output of this DC-to-DC converter, the cathode terminal of this first diode is connected in an end of the primary side of an end of this transistor seconds and this transformer, the other end of the primary side of this transformer is connected in the anode tap of this second diode and the other end of this first transistor, and the cathode terminal of this second diode is connected in the input of this DC-to-DC converter and the other end of this transistor seconds.
Described DC-to-DC converter, wherein this energy guiding circuit comprises: push-pull type DC-to-DC change-over circuit; Or full-bridge type DC-to-DC change-over circuit.
Described DC-to-DC converter, wherein: this specific voltage comprises no-voltage; And/or this specific currents comprises and is similar to zero electric current.
Description of drawings
Fig. 1 is the circuit diagram of the buck DC-to-DC converter of the pulse-width modulation used always;
Fig. 2 is the circuit diagram of flexible DC-to-DC converter first embodiment that switches of the present invention;
Fig. 3 (a)～(h) be among Fig. 2 the flexible DC-to-DC converter of switching at the circuit diagram of different operating under the stage;
The sequential chart of Fig. 4 current/voltage of main element that is pattern zero to the pattern six;
Fig. 5 is the circuit diagram of flexible DC-to-DC converter second embodiment that switches of the present invention;
Fig. 6 is the circuit diagram of flexible DC-to-DC converter the 3rd embodiment that switches of the present invention;
It (b) is the circuit diagram of flexible DC-to-DC converter the 4th embodiment that switches of the present invention that Fig. 7 (a) reaches;
It (b) is the circuit diagram of flexible DC-to-DC converter the 5th embodiment that switches of the present invention that Fig. 8 (a) reaches;
Fig. 9 is the circuit diagram of flexible DC-to-DC converter the 6th embodiment that switches of the present invention; And
Figure 10 is the circuit diagram of flexible DC-to-DC converter the 7th embodiment that switches of the present invention.
The number in the figure explanation:
100 buck DC-to-DC converter, 101 main switches
102 primary input electric capacity, 103 main inductances
104 main diode 105 main output capacitances
200 DC-to-DC converter, 201 main switches
202 input capacitances, 203 main inductances
204 main diode 205 main output capacitances
206 resonant circuits, 2061 resonance diodes
The secondary side of 2062 resonance inductors, 2063 transformers
The output capacitance of 2064 free-wheel diodes, 2065 main switches
207 energy guiding circuit, 2071 auxiliary forward transistor switches
The primary side of 2072 clamp diodes, 2073 transformers
2074 clamp capacitors, 2075 discharge resistances
208 buck DC-to-DC change-over circuits
N1 first node N2 Section Point
N3 the 3rd node N4 the 4th node
N5 the 5th node N6 the 6th node
Tr transformer V1, Vin input direct voltage
V2 output dc voltage Load load
Q1 transistor Q2 transistor
Q3 transistor Q4 transistor
Q5 transistor D1 diode
D2 diode D3 utmost point pipe
Lr resonance inductor Lo, Lin main inductance
Vc clamp capacitor voltage Vo master output capacitance
Embodiment
See also Fig. 2, it is the circuit diagram of flexible DC-to-DC converter first embodiment that switches of the present invention, wherein, DC-to-DC converter 200 is made of buck DC-to-DC change-over circuit 208, resonant circuit 206 and energy guiding circuit 207.
DC-to-DC converter 200 is electrically connected on input direct voltage V1, and utilizes main switch 201 to carry out conducting and the switching of closing, and with input direct voltage V1 step-down, and on load Load, produce output dc voltage V2.
In Fig. 2, buck DC-to-DC change-over circuit 208 is made of main switch 201, main inductance 203, main diode 204 and main output capacitance 205.Wherein, first end and the input direct voltage V1 of main switch 201 are connected in first node N1, main inductance 203 is electrically connected on Section Point N2 with second end of main switch 201 and the cathode terminal of main diode 204, one end of the other end of main inductance 203 and main output capacitance 205 is connected in the 3rd node N3, and the 3rd node N3 is as the output of output dc voltage V2, at last, the other end of the anode tap of main diode 204 and main output capacitance 205 is connected in the 4th node N4.
In buck DC-to-DC change-over circuit 208, when main switch 201 conductings, just to main inductance 203 and 205 chargings of main output capacitance, main diode 204 is in reverse biased and ends input direct voltage V1 at this moment; When main switch 201 is closed, the just conducting of main diode 204, the voltage of main inductance 203 is promptly to main output capacitance 205 chargings.Therefore, by the periodic conducting of main switch with end, just can on load Load, produce output dc voltage V2.
Secondly, resonant circuit 206 is made of secondary side 2063 and the free-wheel diode 2064 of resonance diode 2061, resonance inductor 2062, transformer Tr.The purpose of resonant circuit 206 is to make the main switch 201 of buck DC-to-DC change-over circuit 208 can conducting when no-voltage.
In resonant circuit 206, the anode tap of resonance diode 2061 and the other end of main output capacitance 205 and the anode tap of main diode 204 are connected in the 4th node N4 jointly, the cathode terminal of resonance diode 2061 is connected in series in an end of the secondary side 2063 of transformer Tr, and the other end of the secondary side 2063 of transformer Tr and an end of resonance inductor 2062 are connected in the 6th node N6, and second end of the other end of resonance inductor 2062 and main switch 201 is connected in Section Point N2, and the cathode terminal of free-wheel diode 2064 is connected in the 6th node N6, and its anode tap is connected in the 4th node N4.
In addition, forward primary side 2073, clamp capacitor 2074 and the discharge resistance 2075 of transistor switch 2071, clamp diode 2072, transformer Tr are constituted energy guiding circuit 207 by assisting.
One end of first end of auxiliary forward transistor switch 2071 and the primary side 2073 of transformer Tr is connected in the 5th node N5, auxiliary forward second end of transistor switch 2071 then is connected in the 4th node N4, the other end of the primary side 2073 of transformer Tr is connected in first node N1, the anode tap of clamp diode 2072 is connected in the 5th node N5, cathode terminal then is connected in an end of clamp capacitor 2074 and discharge resistance 2075, and the other end of clamp capacitor 2074 and discharge resistance 2075 is connected in first node N1 jointly.
See also Fig. 3 (a)～(h), it is that the flexible DC-to-DC converter of switching is at the circuit diagram of different operating under the stage among Fig. 2, and its groundwork principle is described below:
(1) pattern zero
Shown in Fig. 3 (a), this pattern is identical with the function mode that the buck DC-to-DC converter 100 commonly used of earlier figures 1 operates in discharge mode (discharge mode); Be stored in the energy on the main inductance 203 of buck DC-to-DC change-over circuit 208, can be discharged on the main output capacitance 205 via main diode 204.
(2) pattern one
Shown in Fig. 3 (b), make energy guide auxiliary forward transistor switch 2071 conductings of circuit 207, because energy is guided before the circuit 207 and attonity, therefore, auxiliary forward transistor switch 2071 becomes zero current passing (ZCS), and the electric current on the resonance inductor 2062 of resonant circuit 206 just increases in the mode of linearity.When the electric current of resonance inductor 2062 was increased to the electric current that makes winner's diode 204 and is 0, then main diode 204 ended, and it also ends for zero current, and this moment, pattern one finished.
(3) pattern two
Shown in Fig. 3 (c), after main diode 204 is closed, the output capacitance 2065 of main switch 201 produces resonance through transformer Tr and resonance diode 2061 forward and with resonance inductor 2062, and this resonance behavior will make the energy on the output capacitance 2065 of main switch 201 be released into zero fully.This pattern finishes when the voltage of the main output capacitance 2065 of main switch 201 is discharged to 0V.
(4) pattern three
Shown in Fig. 3 (d), when output capacitance 2065 voltages of main switch 201 arrive no-voltage, drive main switch 201 conductings, so main switch 201 conducting when no-voltage (ZVS), the energy of resonance inductor 2062 is discharged to primary input electric capacity 202 linearly via transformer Tr, and when the energy release of resonance inductor 2062 finished, this pattern finished.
Because the primary side 2073 of the transformer Tr of energy guiding circuit 207 has magnetic flux with the secondary side 2063 of the transformer Tr of resonant circuit 206 and is connected, and the magnetizing inductance of transformer Tr is very big, therefore the shop helps the forward only remaining a spot of exciting curent of transistor switch 2071, and therefore auxiliary forward transistor switch 2071 cuts out being similar under the situation of zero current.
(5) pattern four
Shown in Fig. 3 (e), this pattern starts from assisting when forward transistor switch 2071 ends, the transformer Tr of energy guiding circuit 207 will carry out demagnetization at excitatory energy, must discharge to finish demagnetization by clamp diode 2072 and clamp capacitor 2074, situation and commonly used pulse-width modulation type buck DC-to-DC converter 100 situation that operate in charge mode of main circuit under this pattern is identical simultaneously.
(6) pattern five
Shown in Fig. 3 (f), main switch 201 still is in conducting state, and the situation that the situation of this pattern and pulse-width modulation type buck DC-to-DC converter 100 commonly used operate in charge mode is identical, and this pattern finishes when main switch 201 is closed.
(7) pattern six
Shown in Fig. 3 (g), when main switch 201 is closed, the main inductance 203 of DC-to-DC converter 200 charges to the output capacitance 2065 of main switch 201, the voltage of output capacitance 2065 can linearly rise, and main diode 204 electric currents of flowing through also can rise gradually, when the electric current of main diode 204 equals output current, main diode 204 complete conductings this moment, the situation that itself and pulse-width modulation type buck DC-to-DC converter 100 commonly used operate in discharge mode is identical, shown in Fig. 3 (h).
(8) pattern zero main element sequential chart to pattern six
See also Fig. 4, the sequential chart of its current/voltage of main elements such as main switch 210, resonance inductor 2062 and auxiliary forward transistor switch 2071 that is pattern zero to the pattern six can have clearer understanding to foregoing each pattern by Fig. 4.
Should be understood that, if the auxiliary forward transistor switch 2071 of energy guiding circuit 207 promptly ends before pattern three finishes, then the free-wheel diode 2064 of resonant circuit 206 just can offer resonance inductor 2062 another energy discharge paths, but under normal operation, this free-wheel diode 2064 can be omitted.
See also Fig. 5, it is the circuit diagram of flexible DC-to-DC converter second embodiment that switches of the present invention; The difference of the DC-to-DC converter 200 of itself and second figure is, guides circuit 207 with energy and replaces with the pair transistor forward type DC-to-DC converter that is made of transistor Q2 and Q3 and diode DA and DB.
See also Fig. 6, it is the circuit diagram of flexible DC-to-DC converter the 3rd embodiment that switches of the present invention; The difference of the DC-to-DC converter 200 of itself and second figure only is, guides circuit 207 with energy and moves to load Load one side that is connected in output.
See also Fig. 7 (a) and (b), it is the circuit diagram of flexible DC-to-DC converter the 4th embodiment that switches of the present invention.Wherein, Fig. 7 (a) only is with the difference of the DC-to-DC converter 200 of Fig. 2, replaces the buck DC-to-DC change-over circuit 208 of Fig. 2 to carry out circuit arrangement with boost type change-over circuit (Boost converter); In addition, Fig. 7 (b) only is the energy guiding circuit 207 of Fig. 7 (a) is moved to load Load one side that is connected in output with the difference of Fig. 7 (a).
See also Fig. 8 (a) and (b), it is the circuit diagram of flexible DC-to-DC converter the 5th embodiment that switches of the present invention.Wherein, Fig. 8 (a) only is with the difference of the DC-to-DC converter 200 of Fig. 2, replaces the buck DC-to-DC change-over circuit 208 of Fig. 2 to carry out circuit arrangement with liter-buck change-over circuit (Buck-Boost converter); In addition, Fig. 8 (b) only is the energy guiding circuit 207 of Fig. 8 (a) is moved to load Load one side that is connected in output with the difference of Fig. 8 (a).
See also Fig. 9, it is the circuit diagram of flexible DC-to-DC converter the 6th embodiment that switches of the present invention.Wherein, the difference of the DC-to-DC converter 200 of Fig. 9 and Fig. 2 is, replaces the energy guiding circuit 207 of Fig. 2 to carry out circuit arrangement with push-pull type (Push-Pull) DC-to-DC change-over circuit.
See also Figure 10, it is the circuit diagram of flexible DC-to-DC converter the 7th embodiment that switches of the present invention.Wherein, the difference of the DC-to-DC converter 200 of Figure 10 and Fig. 2 is, replaces the energy guiding circuit 207 of Fig. 2 to carry out circuit arrangement with full-bridge type (Full-Bridge) DC-to-DC change-over circuit.
Comprehensively above-mentioned, the DC-to-DC converter that flexibility proposed by the invention is switched, mainly utilize resonant circuit to make the main switch of DC-to-DC change-over circuit carry out zero voltage switching, and the auxiliary forward transistor switch of energy guiding circuit also can be by the resonance effect of resonant circuit, to realize the switching of approximate zero electric current.
The invention provides a kind of flexible switching DC-DC converter,, therefore solved the defective of known technology, and then reach research and development purpose of the present invention to reduce the switch cost of DC-to-DC converter commonly used with novel zero-voltage zero-current.
The present invention can carry out various modifications by the person skilled in the art, yet does not break away from the claimed scope of claim.
Claims (10)
1. flexible DC-to-DC converter of switching comprises:
Change-over circuit has main switch, and this change-over circuit is in order to convert input direct voltage to output dc voltage;
Resonant circuit is electrically connected on this change-over circuit, and this resonant circuit is in this main switch of conducting under the situation of a specific voltage at this main switch by the resonance effect; And
Energy guiding circuit, has auxiliary switch, this energy guiding circuit magnetic flux is coupled in this resonant circuit, and has at this auxiliary switch by this resonance effect under the situation of a specific currents and close this auxiliary switch, switches with the flexibility of finishing this main switch and this auxiliary switch;
Wherein this resonant circuit is made of secondary side, resonance inductor, resonance diode and the free-wheel diode of transformer, the cathode terminal of this resonance diode is connected in an end of the secondary side of this transformer, the other end of the secondary side of this transformer is connected in the cathode terminal of this free-wheel diode and an end of this resonance inductor, and the anode tap of this resonance diode is connected in the anode tap of this free-wheel diode.
2. DC-to-DC converter as claimed in claim 1, wherein:
This main switch comprises transistor; And/or
This auxiliary switch comprises transistor.
3. DC-to-DC converter as claimed in claim 1, wherein:
This change-over circuit comprises the buck change-over circuit;
This buck change-over circuit also comprises main inductance, main diode and main output capacitance, one end of this main inductance is connected in an end of this main switch and the cathode terminal of this main diode, the other end of this main inductance is connected in an end of this main output capacitance and the output of this DC-to-DC converter, and the anode tap of this main diode is connected in the other end of this main output capacitance and the output of this DC-to-DC converter.
4. DC-to-DC converter as claimed in claim 1, wherein:
This change-over circuit comprises the boost type change-over circuit;
This boost type change-over circuit also comprises main inductance, main diode and main output capacitance, one end of this main inductance is connected in the input of DC-to-DC converter, the other end of this main inductance is connected in an end of this main switch and the anode tap of this main diode, the cathode terminal of this main diode is connected in an end of this main output capacitance and the output of this DC-to-DC converter, and the other end of this main output capacitance is connected in the other end of this main switch and the output of this DC-to-DC converter.
5. DC-to-DC converter as claimed in claim 1, wherein:
This change-over circuit comprises liter-buck change-over circuit;
This liter-buck change-over circuit also comprises main inductance, main diode and main output capacitance, one end of this main inductance is connected in an end of this main switch and the cathode terminal of this main diode, the anode tap of this main diode is connected in an end of this main output capacitance and the output of this DC-to-DC converter, and the other end of this main inductance is connected in the other end of this main output capacitance and the output of this DC-to-DC converter.
6. DC-to-DC converter as claimed in claim 1, wherein this energy guiding circuit is connected in parallel in the output of this DC-to-DC converter.
7. DC-to-DC converter as claimed in claim 1, wherein this energy guiding circuit is by this auxiliary switch, clamp diode, the primary side of transformer, clamp capacitor and discharge resistance constitute, one end of this discharge resistance is connected in the input of this DC-to-DC converter, one end of one end of this clamp capacitor and the primary side of this transformer, the other end of this discharge resistance is connected in the other end of this clamp capacitor and the cathode terminal of this clamp diode, the anode tap of this clamp diode is connected in the other end of primary side of this transformer and an end of this auxiliary switch, and the other end of this auxiliary switch is connected in the input and the output of this DC-to-DC converter.
8. DC-to-DC converter as claimed in claim 1, wherein:
This energy guiding circuit comprises pair transistor forward type DC-to-DC change-over circuit;
This pair transistor forward type DC-to-DC change-over circuit is by the first transistor, transistor seconds, first diode, the primary side of second diode and transformer constitutes, the anode tap of this first diode is connected in an end of this first transistor and the output of this DC-to-DC converter, the cathode terminal of this first diode is connected in an end of the primary side of an end of this transistor seconds and this transformer, the other end of the primary side of this transformer is connected in the anode tap of this second diode and the other end of this first transistor, and the cathode terminal of this second diode is connected in the input of this DC-to-DC converter and the other end of this transistor seconds.
9. DC-to-DC converter as claimed in claim 1, wherein this energy guiding circuit comprises:
Push-pull type DC-to-DC change-over circuit; Or
Full-bridge type DC-to-DC change-over circuit.
10. DC-to-DC converter as claimed in claim 1, wherein:
This specific voltage comprises no-voltage; And/or
This specific currents comprises and is similar to zero electric current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100844082A CN100440703C (en) | 2005-07-15 | 2005-07-15 | Flexible-switching DC-DC converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100844082A CN100440703C (en) | 2005-07-15 | 2005-07-15 | Flexible-switching DC-DC converter |
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| Publication Number | Publication Date |
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| CN1897427A CN1897427A (en) | 2007-01-17 |
| CN100440703C true CN100440703C (en) | 2008-12-03 |
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| CNB2005100844082A Active CN100440703C (en) | 2005-07-15 | 2005-07-15 | Flexible-switching DC-DC converter |
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| CN103095132B (en) * | 2012-11-29 | 2014-08-13 | 盐城工学院 | Voltage reduction type convertor |
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|---|---|---|---|---|
| US5477131A (en) * | 1993-09-02 | 1995-12-19 | Motorola, Inc. | Zero-voltage-transition switching power converters using magnetic feedback |
| US20010019490A1 (en) * | 1997-12-03 | 2001-09-06 | Fuji Electric Co., Ltd. | Switching power supply |
| JP2001298951A (en) * | 2000-04-17 | 2001-10-26 | Sanken Electric Co Ltd | Dc-dc converter |
| JP2001309646A (en) * | 2000-04-26 | 2001-11-02 | Matsushita Electric Ind Co Ltd | Switching power unit |
| US6429629B1 (en) * | 2001-03-08 | 2002-08-06 | Tranh To Nguyen | Switch-mode power supplies |
| JP2002369521A (en) * | 2000-05-31 | 2002-12-20 | Sanken Electric Co Ltd | Dc-dc converter |
| CN1574582A (en) * | 2003-05-23 | 2005-02-02 | 台达电子工业股份有限公司 | Soft switch power converter |
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2005
- 2005-07-15 CN CNB2005100844082A patent/CN100440703C/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5477131A (en) * | 1993-09-02 | 1995-12-19 | Motorola, Inc. | Zero-voltage-transition switching power converters using magnetic feedback |
| US20010019490A1 (en) * | 1997-12-03 | 2001-09-06 | Fuji Electric Co., Ltd. | Switching power supply |
| JP2001298951A (en) * | 2000-04-17 | 2001-10-26 | Sanken Electric Co Ltd | Dc-dc converter |
| JP2001309646A (en) * | 2000-04-26 | 2001-11-02 | Matsushita Electric Ind Co Ltd | Switching power unit |
| JP2002369521A (en) * | 2000-05-31 | 2002-12-20 | Sanken Electric Co Ltd | Dc-dc converter |
| US6429629B1 (en) * | 2001-03-08 | 2002-08-06 | Tranh To Nguyen | Switch-mode power supplies |
| CN1574582A (en) * | 2003-05-23 | 2005-02-02 | 台达电子工业股份有限公司 | Soft switch power converter |
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| Publication number | Publication date |
|---|---|
| CN1897427A (en) | 2007-01-17 |
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Assignee: In reach electronics (Jiangsu) Co., Ltd Assignor: Delta Optoelectronics Inc. Contract fulfillment period: 2008.1.1 to 2013.12.31 contract change Contract record no.: 2009990000379 Denomination of invention: Flexible-switching DC-DC converter Granted publication date: 20081203 License type: Exclusive license Record date: 2009.4.28 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.1.1 TO 2013.12.31; CHANGE OF CONTRACT Name of requester: ZHONGDA ELECTRONICS (JIANGSU) CO., LTD. Effective date: 20090428 |