CN202535116U - Solar energy charging circuit - Google Patents
Solar energy charging circuit Download PDFInfo
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- CN202535116U CN202535116U CN201220183839XU CN201220183839U CN202535116U CN 202535116 U CN202535116 U CN 202535116U CN 201220183839X U CN201220183839X U CN 201220183839XU CN 201220183839 U CN201220183839 U CN 201220183839U CN 202535116 U CN202535116 U CN 202535116U
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- storage battery
- battery bat
- auxiliary switch
- charging circuit
- diode
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Abstract
The utility model relates to the technical field of solar energy power generation and specifically relates to a solar energy charging circuit. The solar energy charging circuit comprises a main charging switch tube VT1 and an energy storage inductor L1 and a freewheeling diode D1, wherein the main charging switch tube VT1 and the energy storage inductor L1 are connected in series and then connected in series with a solar energy battery PV and a storage battery BAT to form a main charging circuit, the freewheeling diode D1 is connected in parallel with the solar energy battery PV, the freewheeling diode D1, the energy storage inductor L1 and the storage battery BAT are connected in series to form a freewheeling loop, an auxiliary switch tube S1 is connected in series with the freewheeling diode D1 and then connected in parallel with the solar energy battery PV, the auxiliary switch tube S1 is controlled by access polarity of the storage battery BAT, when charged access polarity of the storage battery BAT is correct, the auxiliary switch tube S1 is in the on-state, and when the charged access polarity of the storage battery BAT is inverted, the auxiliary switch tube S1 is in the off-state. The solar energy charging circuit solves a problem of occurrence of an accident caused by a short circuit which is formed the storage battery BAT in the freewheeling loop when the charged access polarity of the storage battery BAT is inverted by carelessness.
Description
Technical field
The utility model relates to the solar energy generation technology field, is specifically related to solar charging circuit.
Background technology
In the existing solar charging power technology; Part circuit is the conducting of directly adopting the switch controlled charging circuit with disconnection, in the major loop that charges, does not have continuous current circuit, and charging current is discontinuous; The current sample difficulty has brought obstacle for the raising of MPPT maximum power point tracking performance; The sudden change of charging current causes the surge voltage stress of charge switch pipe very big, causes the generation of switching tube over-voltage breakdown accident easily; The voltage fluctuation at storage battery two ends simultaneously is violent, and electromagnetic interference is serious, has also reduced the useful life of storage battery.Energy storage inductor and fly-wheel diode in solar charging circuit, have been increased for this reason; Constituted BUCK type charging circuit; But because the existence of the continuous current circuit in the BUCK circuit; If the careless error-polarity connection of storage battery then can cause storage battery to cause short circuit through continuous current circuit, thereby serious accidents such as initiation fire, personal injury.
Summary of the invention
The utility model is intended to provide a kind of solar charging circuit, and especially a kind of new circuit topological structure causes storage battery in continuous current circuit, to form the accidents caused problem of short circuit to solve the careless charged error-polarity connection of storage battery.
Provide solar charging circuit for this reason, comprise charging main switch VT1 and energy storage inductor L1, connecting with solar cell PV that is inserted and the storage battery BAT that is inserted after their series connection forms the charging major loop again;
Comprise the sustained diode parallelly connected with solar cell PV 1, sustained diode 1, energy storage inductor L1 and storage battery BAT series connection form continuous current circuit;
It is characterized in that:
Parallelly connected with solar cell PV again after auxiliary switch S1 being arranged and sustained diode 1 being connected; Auxiliary switch S1 receives storage battery BAT to insert Polarity Control; The correctly then auxiliary switch S1 conducting of the charged access polarity of storage battery BAT, the charged error-polarity connection of storage battery BAT then auxiliary switch S1 are turn-offed.
The operation principle of solar charging circuit is; Solar cell PV, charging main switch VT1, energy storage inductor L1, storage battery BAT series connection form the charging major loop; Sustained diode 1, inductance L 1, storage battery BAT series connection form continuous current circuit, and charging main switch VT1 can adopt the PWM control mode, and storage battery BAT charging current is continuous; Current sample is convenient, has improved the performance of MPPT maximum power point tracking (MPPT); Owing to the existence of continuous current circuit, reduced the surge voltage stress of charging main switch VT1, guaranteed that charging main switch VT1 works reliably; The voltage fluctuation at storage battery BAT two ends simultaneously reduces, and has reduced electromagnetic interference, helps prolonging the useful life of storage battery BAT.Charging main switch VT1 can be the MOSFET pipe or the IGBT pipe of band parasitic body diode.
The beneficial effect of the utility model is; Auxiliary switch S1 is with parallelly connected with solar cell PV again after sustained diode 1 is connected, and auxiliary switch S1 receives the charged access Polarity Control of storage battery BAT, when the charged access polarity of storage battery BAT is correct; Auxiliary switch S1 conducting; The continuous current circuit function is normal, if the charged error-polarity connection of storage battery BAT takes place, then auxiliary switch S1 turn-offs; Continuous current circuit short circuit when having prevented the charged error-polarity connection of storage battery BAT, thus the storage battery BAT generation that causes personal injury and property loss accident on fire avoided.Auxiliary switch S1 can be MOSFET pipe or IGBT pipe.
The utility model preferably; Also be serially connected with in the public part of charging major loop and continuous current circuit and be used to the anti-backflow pipe VT2 that prevents that storage battery BAT from discharging to solar cell PV; When having prevented night or not had sunlight; Storage battery BAT carries out reverse current to solar cell PV and pours in down a chimney, and has avoided the energy loss of storage battery BAT.Anti-backflow pipe VT2 can be the independent diode or the MOSFET pipe or the IGBT pipe of band parasitic body diode, and anti-backflow pipe VT2 also can be relay or contactor.Further, charging main switch VT1 can be the MOSFET pipe or the IGBT pipe of band parasitic body diode, and it is not in continuous current circuit.Charging main switch VT1 and sustained diode 1 constitute solar cell polarity reverse-connection protection circuit; When storage battery BAT correctly connects; If solar cell PV error-polarity connection; The parasitic diode of main switch VT1 and diode D1 just form short-channel to solar cell PV, and solar cell PV allows output short-circuit, and this has just been avoided storage battery BAT voltage and solar cell PV voltage to superpose in the same way and has caused anti-backflow pipe VT2 overvoltage damage.
The utility model can also comprise diode VD1 and optocoupler U1; Be connected between the positive and negative electrode of storage battery BAT behind the photodiode series aiding connection of diode VD1 and optocoupler U1 inside, realize that through optocoupler U1 storage battery BAT inserts the control of polarity to auxiliary switch S1.The effect of diode VD1 is to prevent that the reverse overvoltage of the inner photodiode of optocoupler U1 from damaging.On this basis more preferably; The driving voltage of auxiliary switch S1 is converted by the output voltage of storage battery BAT; The charged access polarity of storage battery BAT correctly then provides this driving voltage; The charged error-polarity connection of storage battery BAT does not then provide this driving voltage, the safeguard protection when further guaranteeing storage battery BAT reversal connection.
The utility model adopts technique scheme, the charging current continuously smooth, and the charging current sampling is convenient, has improved the efficient of MPPT maximum power point tracking.Simultaneously, because the effect of continuous current circuit, the surge voltage stress of charging main switch VT1 is very little, greatly reduces thermal losses, has guaranteed that charging main switch VT1 works safely and reliably.The utility model circuit topology is simple, and system effectiveness is high, has anti-backflow simultaneously, prevents that solar cell PV error-polarity connection from damaging, preventing the defencive function that storage battery BAT error-polarity connection damages.
Description of drawings
Fig. 1 is first embodiment schematic diagram of solar charging circuit.
Fig. 2 is second embodiment schematic diagram of solar charging circuit.
Fig. 3 is the 3rd embodiment schematic diagram of solar charging circuit.
Fig. 4 is the 4th embodiment schematic diagram of solar charging circuit.
Fig. 5 is the 5th embodiment schematic diagram of solar charging circuit.
Fig. 6 is that storage battery inserts Polarity Control drive circuit schematic diagram.
Fig. 7 is the switching power circuit schematic diagram that produces driving voltage.
Embodiment
Like Fig. 1,2,3,4 or 5, charging main switch VT1, energy storage inductor L1, solar cell PV and storage battery BAT series connection form the charging major loop, and solar cell PV charges to storage battery BAT in the charging major loop.Sustained diode 1 is parallelly connected with solar cell PV, and sustained diode 1, energy storage inductor L1 and storage battery BAT series connection form continuous current circuit.
Charging main switch VT1 is not in the continuous current circuit: in Fig. 1, the embodiment shown in 2 or 5, charging main switch VT1 is connected on solar cell binding post negative pole PV-; In the embodiment shown in Fig. 3 or 4, charging main switch VT1 is connected on the anodal PV+ of solar cell binding post.Anti-backflow pipe VT2 then is serially connected in the public part of charging major loop and continuous current circuit: in Fig. 1,2, the embodiment shown in 3 or 4, anti-backflow pipe VT2 is connected on battery terminal negative pole BAT-, and energy storage inductor L1 is connected on the anodal BAT+ of battery terminal; In embodiment as shown in Figure 5, anti-backflow pipe VT2 is connected on the anodal BAT+ of battery terminal, and energy storage inductor L1 is connected on battery terminal negative pole BAT-.
Charging main switch VT1 is the MOSFET pipe or the IGBT pipe of band parasitic body diode in these embodiment, receives control system control conducting and shutoff outside the solar charging circuit.Anti-backflow pipe VT2 is used to prevent that storage battery BAT from discharging to solar cell PV.Anti-backflow pipe VT2 is the MOSFET pipe or the IGBT pipe of band parasitic body diode in these embodiment, controlled by the control system outside the solar charging circuit; Can change in other embodiments is diode independently; Also can change in other embodiments is relay or contactor, controlled by the control system outside the solar charging circuit.
When the careless reversal connection of solar cell PV; Solar cell PV just through the parasitic diode of charging main switch VT1 and sustained diode 1 by short circuit, the overvoltage damage of having avoided storage battery BAT voltage and solar cell PV voltage to superpose in the same way causing anti-backflow pipe VT2.
Auxiliary switch S1 is with parallelly connected with solar cell PV again after sustained diode 1 is connected.Auxiliary switch S1 receives the charged access Polarity Control of storage battery BAT, and insert the Polarity Control drive circuit through storage battery particularly and realize control: in Fig. 1, the embodiment shown in 3 or 5, auxiliary switch S1 is connected on the anode tap of sustained diode 1; In the embodiment shown in Fig. 2 or 4, auxiliary switch S1 is connected on the cathode terminal of sustained diode 1.Auxiliary switch S1 is MOSFET pipe or IGBT pipe in these embodiment.
The correctly then auxiliary switch S1 conducting of the charged access polarity of storage battery BAT; The charged error-polarity connection of storage battery BAT then auxiliary switch S1 turn-offs; Concrete realization can be as shown in Figure 6; Be connected between the positive and negative electrode of storage battery BAT behind the photodiode series aiding connection of diode VD1 and optocoupler U1 inside, realize that through optocoupler U1 storage battery BAT inserts the control of polarity to auxiliary switch S1:
When the charged error-polarity connection of storage battery BAT; Battery positive voltage binding post BAT+ current potential is lower than battery terminal negative binding post BAT-; It is in the opposite direction to apply the inner photodiode of voltage and optocoupler U1, not conducting of optocoupler U1, and auxiliary switch S1 just keeps turn-offing; At this moment, the diode VD1 with the inner photodiode series aiding connection of optocoupler U1 can prevent that the reverse overvoltage of the inner photodiode of optocoupler U1 from damaging;
When just connecing (it is correct promptly to insert polarity) when storage battery BAT is charged, battery positive voltage binding post BAT+ current potential is higher than battery terminal negative binding post BAT-, optocoupler U1 conducting, auxiliary switch S1 conducting thereupon.
It is thus clear that when the charged error-polarity connection of storage battery BAT, auxiliary switch S1 turn-offs, continuous current circuit just can not connected; When storage battery BAT is charged when just connecing, auxiliary switch S1 conducting, continuous current circuit is connected.
Among Fig. 6; The driving voltage that is applied between VCC1+ and the VCC1-is used to drive auxiliary switch S1; This driving voltage can be converted by the output voltage of storage battery BAT; The charged access polarity of storage battery BAT correctly then provides this driving voltage, and the charged error-polarity connection of storage battery BAT does not then provide this driving voltage, specifically can be produced by switching power circuit as shown in Figure 7.Among Fig. 7; The anode of battery positive voltage binding post BAT+ and diode D2 is connected; End of the same name 1 pin of first winding of the positive pole of the power supply end of the negative electrode of diode D2 and control chip U2 (7 pin), capacitor C 1, the negative electrode of diode D3, transformer T1 is connected; Different name end 2 pin of first winding of transformer T1 and the drain electrode of switching tube Q1 are connected; The source electrode of switching tube Q1 is connected with battery terminal negative binding post BAT-; The negative pole of capacitor C 1 is connected with battery terminal negative binding post BAT-, and different name end 3 pin of second winding of the anode of diode D3 and transformer T1 are connected, and end of the same name 4 pin of second winding of transformer T1 are connected with battery terminal negative binding post BAT-.The compensation end COM (1 pin) of control chip U2 and an end of capacitor C 2 are connected; The other end of capacitor C 2 is connected with battery terminal negative binding post BAT-; Reference power source output VREF (8 pin) and an end of capacitor C 3, the end of resistance R 4 of control chip U2 are connected; The other end of capacitor C 3 is connected with battery terminal negative binding post BAT-; RT/CT end (4 pin) and the other end of resistance R 4, the end of capacitor C 4 of control chip U2 are connected, and the other end of capacitor C 4 is connected with battery terminal negative binding post BAT-.One end of the output of control chip U2 (6 pin) and resistance R 5 is connected, and the grid of the other end of resistance R 5 and switching tube Q1, an end of resistance R 6 are connected, and the other end of resistance R 6 is connected with battery terminal negative binding post BAT-.The in-phase input end of the internal error amplifier of control chip U2 (2 pin), current detecting input (3 pin), earth terminal (5 pin) are connected with battery terminal negative binding post BAT-.The end of the same name of the output winding of transformer T1 is connected with the anode of diode D4; One end of the negative electrode of diode D4 and inductance L 2 is connected; The positive pole of the other end of inductance L 2 and capacitor C 5, an end of resistance R 7 are connected, and the other end of the negative pole of capacitor C 5, resistance R 7 is connected with the different name end of the output winding of transformer T1.The positive pole output of capacitor C 5 is VCC1+, and the negative pole output of capacitor C 5 is VCC1-.The model of control chip U2 is UC3845.
When the charged error-polarity connection of storage battery BAT; Because the unidirectional conducting effect of diode D2, transformer T1 secondary output voltage is 0, does not promptly have output voltage; Thereby can not driving voltage be provided for the auxiliary switch S1 among Fig. 6; Switching tube S1 just can't conducting, and continuous current circuit breaks off always, the safeguard protection when having guaranteed storage battery BAT reversal connection.
When storage battery BAT is charged when just connecing; Transformer T1 secondary output voltage is normal; For the auxiliary switch S1 among Fig. 6 provides driving voltage, it is correct that the optocoupler U1 among while Fig. 6 detects storage battery BAT access polarity, just controls auxiliary switch S1 and driven conducting; Continuous current circuit is connected, the solar charging circuit operate as normal.
Should be noted that at last through changing the position of charging main switch VT1, anti-backflow pipe VT2 and energy storage inductor L1 in the charging major loop, can also obtain other circuit topologies embodiment.
Above embodiment is only in order to the technical scheme of explanation the utility model but not to the restriction of the utility model protection range; Although the utility model has been done detailed description with reference to preferred embodiment; Those of ordinary skill in the art can make amendment or is equal to replacement the technical scheme of the utility model, and does not break away from the essence and the scope of the utility model technical scheme.
Claims (9)
1. solar charging circuit,
Comprise charging main switch VT1 and energy storage inductor L1, connecting with solar cell PV that is inserted and the storage battery BAT that is inserted after their series connection forms the charging major loop again;
Comprise the sustained diode parallelly connected with solar cell PV 1, sustained diode 1, energy storage inductor L1 and storage battery BAT series connection form continuous current circuit;
It is characterized in that:
Parallelly connected with solar cell PV again after auxiliary switch S1 being arranged and sustained diode 1 being connected; Auxiliary switch S1 receives storage battery BAT to insert Polarity Control; The correctly then auxiliary switch S1 conducting of the charged access polarity of storage battery BAT, the charged error-polarity connection of storage battery BAT then auxiliary switch S1 are turn-offed.
2. solar charging circuit according to claim 1 is characterized in that, charging main switch VT1 is the MOSFET pipe or the IGBT pipe of band parasitic body diode.
3. solar charging circuit according to claim 2 is characterized in that, charging main switch VT1 is not in continuous current circuit.
4. according to claim 1 or 3 described solar charging circuits, it is characterized in that, also be serially connected with in the public part of charging major loop and continuous current circuit and be used to the anti-backflow pipe VT2 that prevents that storage battery BAT from discharging to solar cell PV.
5. solar charging circuit according to claim 4 is characterized in that, anti-backflow pipe VT2 is the independent diode or the MOSFET pipe or the IGBT pipe of band parasitic body diode.
6. solar charging circuit according to claim 4 is characterized in that, anti-backflow pipe VT2 is relay or contactor.
7. according to the described solar charging circuit of claim 1; It is characterized in that; Comprise diode VD1 and optocoupler U1; Be connected between the positive and negative electrode of storage battery BAT behind the photodiode series aiding connection of diode VD1 and optocoupler U1 inside, realize that through optocoupler U1 storage battery BAT inserts the control of polarity to auxiliary switch S1.
8. solar charging circuit according to claim 7; It is characterized in that; The driving voltage of auxiliary switch S1 is converted by the output voltage of storage battery BAT; The charged access polarity of storage battery BAT correctly then provides this driving voltage, and the charged error-polarity connection of storage battery BAT does not then provide this driving voltage.
9. solar charging circuit according to claim 1 is characterized in that, auxiliary switch S1 is MOSFET pipe or IGBT pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220183839XU CN202535116U (en) | 2012-04-27 | 2012-04-27 | Solar energy charging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220183839XU CN202535116U (en) | 2012-04-27 | 2012-04-27 | Solar energy charging circuit |
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| CN202535116U true CN202535116U (en) | 2012-11-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201220183839XU Expired - Fee Related CN202535116U (en) | 2012-04-27 | 2012-04-27 | Solar energy charging circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103269099A (en) * | 2013-05-22 | 2013-08-28 | 深圳市安能能源技术有限公司 | Battery charge-discharge circuit |
| CN107168901A (en) * | 2016-03-08 | 2017-09-15 | 德昌电机(深圳)有限公司 | Mongline two-way communication circuit |
| CN109841923A (en) * | 2017-11-27 | 2019-06-04 | 河南森源重工有限公司 | A kind of battery pack low-temperature heating device, battery module and vehicle |
| CN112202339A (en) * | 2020-09-30 | 2021-01-08 | 重庆长安新能源汽车科技有限公司 | Output reverse connection protection circuit of electric automobile direct current converter |
-
2012
- 2012-04-27 CN CN201220183839XU patent/CN202535116U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103269099A (en) * | 2013-05-22 | 2013-08-28 | 深圳市安能能源技术有限公司 | Battery charge-discharge circuit |
| WO2014186990A1 (en) * | 2013-05-22 | 2014-11-27 | 安徽动力源科技有限公司 | Battery charging and discharging circuit |
| CN103269099B (en) * | 2013-05-22 | 2015-08-19 | 安徽动力源科技有限公司 | Battery charge-discharge circuit |
| CN107168901A (en) * | 2016-03-08 | 2017-09-15 | 德昌电机(深圳)有限公司 | Mongline two-way communication circuit |
| CN107168901B (en) * | 2016-03-08 | 2021-06-25 | 德昌电机(深圳)有限公司 | Single-wire bidirectional communication circuit |
| CN109841923A (en) * | 2017-11-27 | 2019-06-04 | 河南森源重工有限公司 | A kind of battery pack low-temperature heating device, battery module and vehicle |
| CN112202339A (en) * | 2020-09-30 | 2021-01-08 | 重庆长安新能源汽车科技有限公司 | Output reverse connection protection circuit of electric automobile direct current converter |
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Legal Events
| Date | Code | Title | Description |
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| 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: 20121114 Termination date: 20170427 |