CN104377966A - Flyback converter for low-rectified-voltage stress - Google Patents
Flyback converter for low-rectified-voltage stress Download PDFInfo
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- CN104377966A CN104377966A CN201410656109.0A CN201410656109A CN104377966A CN 104377966 A CN104377966 A CN 104377966A CN 201410656109 A CN201410656109 A CN 201410656109A CN 104377966 A CN104377966 A CN 104377966A
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Abstract
A flyback converter for low-rectified-voltage stress comprises a transformer T, a primary side winding of the transformer T is connected with a switch component VT in series and then receives input voltage Vin, and an auxiliary side winding of the transformer T is connected with a voltage output circuit. The flyback converter is characterized by comprising an input voltage sampling circuit, and the connection between the auxiliary side winding of the transformer T and the voltage output circuit concretely includes the steps that A, taps for selection are reserved on the auxiliary side winding of the transformer T; B, when the input voltage Vin measured by the input voltage sampling circuit is high, the voltage output circuit selects to be connected to the tap with a small number of corresponding turns. When the input voltage Vin is low, the voltage output circuit is connected to the tap with a large number of corresponding turns, the auxiliary side winding can obtain sufficiently high voltage, and when the input voltage Vin is high, the voltage output circuit is connected to the tap with the small number of corresponding turns, voltage stress borne by components in the voltage output circuit is reduced, and then reliable working can be guaranteed within the wide input voltage range.
Description
Technical field
The present invention relates to anti exciting converter.
Background technology
At present, in micro-combining inverter generation technology such as photovoltaic, wind-force, usual employing anti exciting converter realizes boosting inverter, anti exciting converter exports and inputs the simplest converter of isolating, output filtering only needs a filter capacitor, do not need the inductance that volume, weight are larger, therefore system cost is lower.
At present in actual applications, the vice-side winding of anti exciting converter: the turn ratio of former limit winding is fixing, at wind, in light power generating system, if input voltage transformation range is wider, when illumination is more weak or wind-force is less, photovoltaic cell or wind-driven generator output voltage lower, in order to the energy produced when making full use of the low light level or gentle breeze, wish vice-side winding: the turn ratio of former limit winding is as far as possible large, allow vice-side winding can obtain enough large voltage, and when illumination is strong or wind-force is powerful, photovoltaic cell or wind-driven generator output voltage very high, vice-side winding: the turn ratio of former limit winding will cause greatly the device in voltage follower circuit (such as rectification circuit) to bear very high voltage stress, cause device over-voltage breakdown, economic loss is caused even to cause security incident.
Summary of the invention
The object of the invention is anti exciting converter can be ensured reliably to work in wide input voltage range.
Provide the anti exciting converter of low commutating voltage stress for this reason, comprise transformer T, input voltage vin is accepted after its former limit windings in series switching device VT, its vice-side winding connects voltage follower circuit, it is characterized in that comprising input voltage sample circuit, the vice-side winding of transformer T and the connection of voltage follower circuit be particularly: the vice-side winding of A. transformer T leaves selective tap, and it is higher that B. input voltage sample circuit records input voltage vin, and voltage follower circuit is selected to be access to the less tap of the corresponding number of turn.
The anti exciting converter that the present invention provides, when input voltage vin is lower, voltage follower circuit is access to the more tap of the corresponding number of turn, allow vice-side winding can obtain enough large voltage, and when input voltage vin is higher, voltage follower circuit is access to the less tap of the corresponding number of turn, reduces the voltage stress that the device in voltage follower circuit bears, thus can ensure reliably to work in wide input voltage range.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of anti exciting converter.
Embodiment
Anti exciting converter is as Fig. 1, and at input side, switching device VT is controlled carries out chop control to input voltage vin, is connected on the two ends of voltage input as input voltage sample circuit after resistance R1, R2 series connection; At outlet side, the vice-side winding of transformer T has two taps 1,2, and tap 1,2 is access to the current rectifying and wave filtering circuit be made up of diode D1, D2, D3, D4 and electric capacity C through relay switch K.
When illumination is more weak or wind-force is less, photovoltaic cell or wind-driven generator output voltage lower, therefore the input voltage vin being input to anti exciting converter is lower.In order to make full use of the energy of the low light level or gentle breeze generation, we wish vice-side winding: the turn ratio of former limit winding is as far as possible large, allow vice-side winding can obtain enough large voltage, for this reason, when input voltage vin is lower, control unit receives lower input voltage signal from the contact of resistance R1 and resistance R2, and just control relay switch K switches to the state as Fig. 1, thus allow voltage follower circuit be access to the more tap of the corresponding number of turn 1, to extract the electric energy that input side provides as far as possible.
When illumination is strong or wind-force is powerful, photovoltaic cell or wind-driven generator output voltage very high, therefore the input voltage vin being input to anti exciting converter is higher, if now vice-side winding: the turn ratio of former limit winding will cause greatly the diode D1 in current rectifying and wave filtering circuit, D2, D3, D4 bears very high voltage stress, therefore, when input voltage vin is higher, control unit receives higher input voltage signal from the contact of resistance R1 and resistance R2, just control relay switch K and switch to the other end, thus allow voltage follower circuit be access to the less tap of the corresponding number of turn 2, thus reduce diode D1, D2, D3, the voltage stress that D4 bears.
In the present embodiment, the vice-side winding of transformer T has two taps, in practice, according to actual needs, can arrange the tap of suitable quantity, and the input voltage value of corresponding respective numbers is interval.
Claims (4)
1. the anti exciting converter of low commutating voltage stress, comprise transformer T, input voltage vin is accepted after its former limit windings in series switching device VT, its vice-side winding connects voltage follower circuit, it is characterized in that comprising input voltage sample circuit, the vice-side winding of transformer T and the connection of voltage follower circuit particularly:
A. the vice-side winding of transformer T leaves selective tap (1,2),
B. to record input voltage vin higher for input voltage sample circuit, and voltage follower circuit is selected to be access to the less tap of the corresponding number of turn (2).
2. anti exciting converter according to claim 1, described voltage follower circuit comprises rectification circuit.
3. anti exciting converter according to claim 1, diverter switch K is connected to realize the selection to tap (1,2) between voltage follower circuit and tap (1,2), the input voltage signal having control unit receiver voltage sample circuit to record also controls diverter switch K accordingly, thus the B described in realizing.
4. anti exciting converter according to claim 1, described diverter switch K is relay switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410656109.0A CN104377966A (en) | 2014-11-18 | 2014-11-18 | Flyback converter for low-rectified-voltage stress |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410656109.0A CN104377966A (en) | 2014-11-18 | 2014-11-18 | Flyback converter for low-rectified-voltage stress |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104377966A true CN104377966A (en) | 2015-02-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410656109.0A Pending CN104377966A (en) | 2014-11-18 | 2014-11-18 | Flyback converter for low-rectified-voltage stress |
Country Status (1)
| Country | Link |
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| CN (1) | CN104377966A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106487233A (en) * | 2016-11-24 | 2017-03-08 | 广东美的制冷设备有限公司 | The power supply circuits of solar air conditioner and solar air conditioner |
| CN106849688A (en) * | 2017-02-14 | 2017-06-13 | 深圳市华星光电技术有限公司 | A kind of circuit and liquid crystal display device for reducing power supply power consumption |
| US10673346B2 (en) | 2017-02-14 | 2020-06-02 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Circuit for reducing power consumption and liquid crystal display |
-
2014
- 2014-11-18 CN CN201410656109.0A patent/CN104377966A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106487233A (en) * | 2016-11-24 | 2017-03-08 | 广东美的制冷设备有限公司 | The power supply circuits of solar air conditioner and solar air conditioner |
| CN106849688A (en) * | 2017-02-14 | 2017-06-13 | 深圳市华星光电技术有限公司 | A kind of circuit and liquid crystal display device for reducing power supply power consumption |
| US10673346B2 (en) | 2017-02-14 | 2020-06-02 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Circuit for reducing power consumption and liquid crystal display |
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