CN203193511U - Forward converter - Google Patents
Forward converter Download PDFInfo
- Publication number
- CN203193511U CN203193511U CN2013201215162U CN201320121516U CN203193511U CN 203193511 U CN203193511 U CN 203193511U CN 2013201215162 U CN2013201215162 U CN 2013201215162U CN 201320121516 U CN201320121516 U CN 201320121516U CN 203193511 U CN203193511 U CN 203193511U
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- Prior art keywords
- transformer
- diode
- forward converter
- energy
- parallel
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model relates to a forward converter comprising a transformer. One end of a power switch and an anode end of an energy releasing diode are connected with one end of a primary winding of the transformer after being connected in parallel; a cathode end of the energy releasing diode is connected with one end of a secondary winding of the transformer; one end of an excitation energy recovery capacitor is also connected with one end of the secondary winding of the transformer; and the other end of the secondary winding of the transformer is connected with an anode end of a secondary rectifier diode. The forward converter can facilitate improvement of the efficiency of a photovoltaic inverter system.
Description
Technical field
The utility model relates to electric and electronic technical field, particularly the forward converter in a kind of photovoltaic DC-to-AC converter.
Background technology
Forward converter is simple owing to its circuit topology, voltage lifting/lowering wide ranges be widely used in, small-power power conversion occasion.Because the transformer of forward converter is unidirectional magnetiztion, so an inherent defect of forward converter is to need adjunct circuit to realize the magnetic reset of transformer.Forward converter transformer magnetic reset technology has multiple.Adopting the forward converter advantage of magnetic reset winding is that technology maturation is reliable, and magnetic energy is lossless to feed back in the direct current survey.But additional magnetic reset winding makes transformer device structure complicated, and power switch pipe also will bear the supply voltage stress of twice in addition.RCD clamp technology has simple, the duty ratio d of circuit〉0.5, advantage such as the power switch voltage stress is low, its deficiency is that magnetic energy partly consumes in clamp resistance, has reduced the whole efficiency of system.The active clamp technology realizes that magnetic reset is a kind of method of function admirable, and its unique deficiency is to have increased converter design difficulty and cost.
Summary of the invention
The utility model provides a kind of forward converter that is beneficial to the efficient that improves the photovoltaic DC-to-AC converter system.
The technical scheme that realizes above-mentioned purpose is as follows:
A kind of forward converter, comprise transformer, one end of a power switch with one release can diode anode tap in parallel after, be connected with an end of the elementary winding of transformer, the cathode terminal of releasing the energy diode is connected with an end of Secondary winding of transformer, one end of an excitatory energy recovery electric capacity also is connected with an end of Secondary winding of transformer, and the other end of Secondary winding of transformer is connected with the anode tap of a secondary commutation diode.
Further, the cathode terminal of described secondary commutation diode filter capacitor in parallel.
Further, the two ends of described power switch buffering energy-absorbing electric capacity in parallel.
Further, described two ends buffering energy-absorbing electric capacity in parallel of releasing the energy diode.
Further, described releasing can diode be fast recovery diode.
Adopted such scheme, excitatory energy of the present utility model reclaims not adopt and adds the degaussing winding, but adopt excitatory energy to reclaim electric capacity and the form of releasing the energy diode, reach following purpose: 1) avoided the design of complicated degaussing winding circuit and the volume that has reduced high frequency transformer, made circuit structure succinct; 2) by releasing and need not to add the RCD buffer circuit in addition by diode two ends little suitable electric capacity in parallel, improved the efficient of system; 3) owing to there is excitatory energy to reclaim electric capacity, therefore saved the output energy storage inductor.
The beneficial effects of the utility model: do not have to reclaim electric capacity by excitatory energy under the degaussing winding in the forward converter of the present utility model and absorb magnetic energy.Under no RCD buffer network, the switch stress of main power tube reduces, and has promoted the efficient of system.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Fig. 1 is forward converter schematic diagram of the present utility model;
Fig. 2 is the work equivalent electric circuit A in one-period of circuit among Fig. 1;
Fig. 3 is the work equivalent electric circuit B in one-period of circuit among Fig. 1;
Fig. 4 is the work equivalent electric circuit C in one-period of circuit among Fig. 1;
Embodiment
With reference to Fig. 1, forward converter of the present utility model comprises transformer T1, the end of a power switch Q1 with one release can diode the end of D2 in parallel after, be connected with an end of the elementary winding of transformer T1.The two ends of power switch Q1 buffering energy-absorbing capacitor C 3 in parallel.The other end of transformer T1 is connected by primary leakage inductance LS and power supply Vin are anodal, and the two ends of power supply Vin are parallel with filter capacitor C1 and filter filter capacitor C2.The other end of releasing energy diode D2 is connected with an end of Secondary winding of transformer, and releasing diode D2 to be fast recovery diode.Release two ends buffering energy-absorbing capacitor C 8 in parallel of energy diode D2.One end of an excitatory energy recovery capacitor C 4 also is connected with an end of Secondary winding of transformer, and the other end that excitatory energy reclaims capacitor C 4 and power switch Q1 is connected with power cathode.The other end of the secondary winding of transformer T1 is connected with the anode tap of a secondary commutation diode D1, the two ends of secondary commutation diode D1 capacitor C 7 in parallel.The cathode terminal of secondary commutation diode D1 filter capacitor C5 in parallel, the cathode terminal of secondary commutation diode D1 be filter capacitor C6 in parallel also, and the other end of filter capacitor C5 and filter capacitor C6 is connected with the negative pole end of power supply Vin.
If circuit of the present utility model can be divided into three operating states at a PWM in the cycle:
State A: power switch Q1 conducting, release and can turn-off by diode D2, secondary commutation diode D1 conducting simultaneously, exciting curent begins to rise, and T1 level of transformer and excitatory energy reclaim capacitor C 4 and transmit energy to load-side jointly, and its equivalent electric circuit is as shown in Figure 2.
State B: power switch Q1 turn-offs, and releases and can turn-off by diode D2, and the secondary current direction of transformer T1 can not be suddenlyd change, and secondary commutation diode D1 continues to keep conducting state, and circuit is in the leakage field energy to the load-side feed status.Its equivalent electric circuit as shown in Figure 3.
State C: power switch Q1 turn-offs, and releases energy diode D2 conducting this moment, and secondary commutation diode D1 turn-offs, and circuit is in excitatory energy to be shifted to excitatory energy recovery capacitor C 4.Its equivalent electric circuit as shown in Figure 4.
Claims (5)
1. forward converter, comprise transformer, it is characterized in that: an end of a power switch (Q1) with one release can diode the anode tap of (D2) in parallel after, be connected with an end of the elementary winding of transformer (T1), the cathode terminal of releasing energy diode (D2) is connected with an end of Secondary winding of transformer, one end of an excitatory energy recovery electric capacity (C4) also is connected with an end of Secondary winding of transformer, and the other end of Secondary winding of transformer is connected with the anode tap of a secondary commutation diode (D2).
2. forward converter according to claim 1 is characterized in that: the cathode terminal of a described secondary commutation diode filter capacitor (C5) in parallel.
3. forward converter according to claim 1 is characterized in that: the two ends of a described power switch buffering energy-absorbing electric capacity (C3) in parallel.
4. forward converter according to claim 1 is characterized in that: a described two ends buffering energy-absorbing electric capacity (C8) in parallel of releasing energy diode (D2).
5. forward converter according to claim 1 is characterized in that: described releasing can be fast recovery diode by diode (D2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201215162U CN203193511U (en) | 2013-03-17 | 2013-03-17 | Forward converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201215162U CN203193511U (en) | 2013-03-17 | 2013-03-17 | Forward converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203193511U true CN203193511U (en) | 2013-09-11 |
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ID=49110339
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013201215162U Expired - Fee Related CN203193511U (en) | 2013-03-17 | 2013-03-17 | Forward converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203193511U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113037093A (en) * | 2021-03-16 | 2021-06-25 | 西安科技大学 | Forward converter with secondary rectifier diode connected with capacitor in parallel and system |
-
2013
- 2013-03-17 CN CN2013201215162U patent/CN203193511U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113037093A (en) * | 2021-03-16 | 2021-06-25 | 西安科技大学 | Forward converter with secondary rectifier diode connected with capacitor in parallel and system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130911 Termination date: 20180317 |