CN204517648U - A kind of discharge circuit, charge-discharge circuit and inverter - Google Patents
A kind of discharge circuit, charge-discharge circuit and inverter Download PDFInfo
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- CN204517648U CN204517648U CN201520175233.5U CN201520175233U CN204517648U CN 204517648 U CN204517648 U CN 204517648U CN 201520175233 U CN201520175233 U CN 201520175233U CN 204517648 U CN204517648 U CN 204517648U
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Abstract
This application discloses a kind of discharge circuit, charge-discharge circuit and inverter, this discharge circuit comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the first switching tube and second switch pipe, wherein: be connected in parallel on dc-link capacitance two ends again after the first resistance and the second resistant series; This electric capacity two ends are connected in parallel on again after 3rd resistance and the 4th resistant series; The input of the first switching tube connects the positive pole of this electric capacity through the 5th resistance, it exports the negative pole of this electric capacity of termination, and it controls the common port of termination the 3rd resistance and the 4th resistance; Input termination the 3rd resistance of second switch pipe and the common port of the 4th resistance, it exports the negative pole of this electric capacity of termination, and it controls the common port of termination first resistance and the second resistance; When DC bus-bar voltage is greater than preset value, the conducting of second switch pipe, the first switching tube turn off; Otherwise second switch pipe turns off, the first switching tube conducting; The resistance of the 3rd resistance is greater than the 5th resistance, reduces discharge resistance power grade.
Description
Technical field
The utility model relates to electric and electronic technical field, more particularly, relates to a kind of discharge circuit, charge-discharge circuit and inverter.
Background technology
In photovoltaic system, for guaranteeing personal safety, need the electric energy on inverter dc-link capacitance to discharge when inverter power down, conventional method adopts the form of discharge resistance heat radiation to consume electric energy.This method structure is simple, but for the inverter of wide output voltage range (output voltage range as 0 ~ 1000V), the power grade of discharge resistance requires higher, causes that its cost is higher, volume is larger.
Utility model content
In view of this, the utility model provides a kind of discharge circuit, charge-discharge circuit and inverter, to reduce the power grade of discharge resistance, and then reduces the cost of discharge resistance, the volume of reduction discharge resistance.
A kind of discharge circuit, comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the first switching tube and second switch pipe, wherein:
Dc-link capacitance two ends are connected in parallel on again after described first resistance and described second resistant series;
Described dc-link capacitance two ends are connected in parallel on again after described 3rd resistance and described 4th resistant series;
The input of described first switching tube connects the positive pole of described dc-link capacitance through described 5th resistance, it exports the negative pole of dc-link capacitance described in termination, and it controls the common port of the 3rd resistance and described 4th resistance described in termination;
The common port of the 3rd resistance described in the input termination of described second switch pipe and described 4th resistance, it exports the negative pole of dc-link capacitance described in termination, and it controls the common port of the first resistance and described second resistance described in termination;
When DC bus-bar voltage is greater than preset value, the conducting of described second switch pipe, described first switching tube turn off; When DC bus-bar voltage is less than described preset value, described second switch pipe turns off, described first switching tube conducting; The resistance of described 3rd resistance is greater than described 5th resistance.
Wherein, described first switching tube and/or described second switch pipe are MOS.
Wherein, described first switching tube and/or described second switch pipe are IGBT.
Alternatively, described discharge circuit also comprises: input connects the positive pole of described dc-link capacitance through described 3rd resistance, exports the first gate-controlled switch of the negative pole of dc-link capacitance described in termination.
A kind of charge-discharge circuit, comprises charging circuit and any one discharge circuit above-mentioned;
Described charging circuit comprises the second gate-controlled switch, rectifier bridge and described 5th resistance, wherein: the input of described rectifier bridge connects AC power through described second gate-controlled switch, its positive output end connects the positive pole of described dc-link capacitance through described 5th resistance, its negative output terminal ground connection.
Alternatively, described discharge circuit also comprises: the 6th resistance connecting the input of described 5th resistance and described first switching tube.
Alternatively, described charging circuit also comprises: be connected on the protection component on described charging circuit trunk roads.
Wherein, described protection component is fuse.
Wherein, described protection component is miniature circuit breaker.
A kind of inverter, comprises any one discharge circuit above-mentioned or any one charge-discharge circuit above-mentioned.
As can be seen from above-mentioned technical scheme, the utility model adopts two-stage electric discharge, one-level discharge loop is formed by the first resistance, the second resistance, the 3rd resistance and second switch pipe, two-stage discharge loop is formed by the 3rd resistance, the 4th resistance, the 5th resistance and the first switching tube, adopt when DC bus-bar voltage is higher the one-level discharge loop that discharge resistance resistance is larger, adopt when DC bus-bar voltage is lower the two-stage discharge loop that discharge resistance resistance is less.According to formula U
2/ R=P is known, compared to the changeless discharge resistance of resistance that prior art adopts, the utility model can regulate the resistance of discharge resistance in the same way according to DC bus-bar voltage size variation direction, this significantly reduces the power grade of discharge resistance, and then reduce the cost of discharge resistance, decrease the volume of discharge resistance.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of discharge circuit structural representation disclosed in the utility model embodiment;
Fig. 2 is the utility model embodiment another discharge circuit structural representation disclosed;
Fig. 3 is a kind of charge-discharge circuit structural representation disclosed in the utility model embodiment;
Fig. 4 is the utility model embodiment another charge-discharge circuit structural representation disclosed.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
See Fig. 1, the utility model embodiment discloses a kind of discharge circuit, to reduce the power grade of discharge resistance, and then reduce the cost of discharge resistance, the volume of reduction discharge resistance, comprise the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the first switching tube Q1 and second switch pipe Q2, wherein:
First resistance R1 is connected in parallel on dc-link capacitance C after connecting with the second resistance R2 again
dctwo ends;
3rd resistance R3 and the 4th resistance R4 is connected in parallel on dc-link capacitance C after connecting again
dctwo ends;
The input of the first switching tube Q1 meets dc-link capacitance C through the 5th resistance R5
dcpositive pole, it exports termination dc-link capacitance C
dcnegative pole, it controls the common port of termination the 3rd resistance R3 and the 4th resistance R4;
Input termination the 3rd resistance R3 of second switch pipe Q2 and the common port of the 4th resistance R4, it exports termination dc-link capacitance C
dcnegative pole, it controls the common port of termination first resistance R1 and the second resistance R2;
When DC bus-bar voltage is greater than preset value V
2time, second switch pipe Q2 conducting, the first switching tube Q1 turn off; When DC bus-bar voltage is less than preset value V
2time, second switch pipe Q2 turns off, the first switching tube Q1 conducting; The resistance of the 3rd resistance R3 is greater than the 5th resistance R5.
The present embodiment adopts two-stage discharge circuit to realize dc-link capacitance C
dcelectric discharge, one-level discharge loop 100 is made up of R1, R2, R3 and Q2, and wherein R1 and R2 forms bleeder circuit, and R3 is discharge resistance; Two-stage discharge loop 200 is made up of R3, R4, R5 and Q1, and wherein R3 and R4 forms bleeder circuit, and R5 is discharge resistance.The present embodiment is with V
2as the switched voltage of two-stage discharge circuit, use the one-level discharge loop 100 (corresponding discharge resistance is R3) that discharge resistance resistance is larger when DC bus-bar voltage is higher, use the two-stage discharge loop 200 (corresponding discharge resistance is R5) that discharge resistance resistance is less when DC bus-bar voltage is lower.
The operation principle of described discharge circuit is as follows:
For ease of describing, first establishing the common port voltage of DC bus-bar voltage, R1 and R2, the common port voltage of R3 and R4 is respectively V
dc, V
q2, V
q1;
Work as V
dc>=V
2time, V
dcv is obtained through R1 and R2 dividing potential drop
q2, pre-set V
q2be greater than the starting resistor of Q2, now Q2 conducting, dc-link capacitance C
dcdischarged by R2 and Q2;
Work as V
dc< V
2time, Q2 turns off; V
dcv is obtained through R3 and R4 dividing potential drop
q1, pre-set V
q1be greater than the starting resistor of Q1, now Q1 conducting, dc-link capacitance C
dcdischarged by R5 and Q1.
Visible, the present embodiment adopts two-stage electric discharge, by carrying out rational optimum configurations, at V to discharge circuit
dc>=V
2time Q2 conducting, Q1 are turned off the larger one-level discharge loop 100 of star t-up discharge resistance, at V
dc< V
2time Q2 is turned off, Q1 conducting comes the less two-stage discharge loop 200 of star t-up discharge resistance.According to formula U
2/ R=P (resistance both end voltage square/power of the resistance=resistance of resistance) is known, for the changeless discharge resistance of resistance, and DC bus-bar voltage V
dcgreatly, discharge resistance power is larger; And the present embodiment is according to DC bus-bar voltage V
dcsize variation regulate the resistance of discharge resistance in the same way, thus effectively can reduce the power grade of discharge resistance, and then reduce the cost of discharge resistance, reduce the volume of discharge resistance.
Wherein, first switching tube Q1 and/or second switch pipe Q2 can adopt MOS (Metal OxideSemiconductor FET, mos field effect transistor), also IGBT (Insulated Gate Bipolar Transistor, igbt) or other switch elements can be adopted.For the first switching tube Q1, when Q1 is MOS, the input of Q1 is drain electrode, and the output of Q1 is source electrode, and the control end of Q1 is grid; When Q1 is IGBT, the input of Q1 is collector electrode, and the output of Q1 is emitter, and the control end of Q1 is base stage.
As preferably, see Fig. 2, described discharge circuit also comprises: input meets dc-link capacitance C through the 3rd resistance R3
dcpositive pole, export termination dc-link capacitance C
dcthe first gate-controlled switch K1 of negative pole.
To break down when one-level discharge loop 100 and/or two-stage discharge loop 200 and can not to dc-link capacitance C
dcduring electric discharge, control signal can be sent out to the control end of the first gate-controlled switch K1 and close to make K1, thus utilize the second resistance R2 to discharge, improve described discharge circuit emergent protective capacities in case of a fault.
See Fig. 3, the utility model embodiment also discloses a kind of charge-discharge circuit, to reduce the power grade of discharge resistance, and then reduce the cost of discharge resistance, the volume of minimizing discharge resistance, comprise charging circuit 10 and above-mentioned any one discharge circuit 20 disclosed;
Charging circuit 10 comprises the second gate-controlled switch K2, rectifier bridge Z1 and the 5th resistance R5, wherein:
The input of rectifier bridge Z1 meets AC power V1 through the second gate-controlled switch K2, and its positive output end meets dc-link capacitance C through the 5th resistance R5
dcpositive pole, its negative output terminal ground connection.
As DC bus-bar voltage V
dcbe zero or very low time, control signal control the second gate-controlled switch K2 close, input voltage through rectifier bridge Z1 and the 5th resistance R5 to dc-link capacitance C
dccharging; In charging circuit 10, the 5th resistance R5, as current-limiting resistance, can limit the surge current in charging process.
Wherein, rectifier bridge Z1 selects diode rectifier bridge, is made up of these four diodes of D1 ~ D4.
Wherein, AC power V1 can be single phase alternating current (A.C.) source, also can be three-phase alternating current source; When using single phase alternating current (A.C.) source, the charging circuit that corresponding use rectifier bridge Z1 is single-phase rectification bridge, when using three-phase alternating current source, the charging circuit that corresponding use rectifier bridge Z1 is three-phase commutation bridge, Fig. 3 is only for single phase system.
As preferably, see Fig. 4, discharge circuit 20 also comprises: the 6th resistance R6 connecting the input of the 5th resistance R5 and the first switching tube Q1.Owing to using as the discharge resistance of two-stage discharge circuit in the current-limiting resistance of charging circuit 10 and discharge circuit 20 while of the 5th resistance R5, when practical application, the current-limiting resistance resistance needed for charging circuit 10 and the inconsistent situation of the discharge resistance resistance needed for two-stage discharge circuit may be there is, therefore the present embodiment has set up the 6th resistance R6, thus, charging circuit 10 is using the 5th resistance R5 as current-limiting resistance, two-stage discharge circuit is using the 5th resistance R5 after series connection and the 6th resistance R6 as discharge resistance, by reasonable arrangement the 5th resistance R5, the resistance size of the 6th resistance R6, the resistance demand that charging circuit 10 is different with discharge circuit 20 can be met simultaneously.
As preferably, still see Fig. 4, charging circuit 10 also comprises: be connected on the protection component on charging circuit 10 trunk roads, shields for disconnecting when rectifier bridge Z1 inefficacy short circuit.Described protection component can be fuse F1 ~ F2 as shown in Figure 4, also can be miniature circuit breaker or other protection components.
In addition, the utility model embodiment also discloses a kind of inverter, described inverter comprises above-mentioned any one discharge circuit disclosed or above-mentioned any one charge-discharge circuit disclosed, to reduce the power grade of discharge resistance, and then reduces the cost of discharge resistance, the volume of minimizing discharge resistance.
In sum, the utility model adopts two-stage electric discharge, one-level discharge loop is formed by the first resistance, the second resistance, the 3rd resistance and second switch pipe, two-stage discharge loop is formed by the 3rd resistance, the 4th resistance, the 5th resistance and the first switching tube, adopt when DC bus-bar voltage is higher the one-level discharge loop that discharge resistance resistance is larger, adopt when DC bus-bar voltage is lower the two-stage discharge loop that discharge resistance resistance is less.According to formula U
2/ R=P is known, compared to the changeless discharge resistance of resistance that prior art adopts, the utility model can regulate the resistance of discharge resistance in the same way according to DC bus-bar voltage size variation direction, this significantly reduces the power grade of discharge resistance, and then reduce the cost of discharge resistance, decrease the volume of discharge resistance.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a discharge circuit, is characterized in that, comprises the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the first switching tube and second switch pipe, wherein:
Dc-link capacitance two ends are connected in parallel on again after described first resistance and described second resistant series;
Described dc-link capacitance two ends are connected in parallel on again after described 3rd resistance and described 4th resistant series;
The input of described first switching tube connects the positive pole of described dc-link capacitance through described 5th resistance, it exports the negative pole of dc-link capacitance described in termination, and it controls the common port of the 3rd resistance and described 4th resistance described in termination;
The common port of the 3rd resistance described in the input termination of described second switch pipe and described 4th resistance, it exports the negative pole of dc-link capacitance described in termination, and it controls the common port of the first resistance and described second resistance described in termination;
When DC bus-bar voltage is greater than preset value, the conducting of described second switch pipe, described first switching tube turn off; When DC bus-bar voltage is less than described preset value, described second switch pipe turns off, described first switching tube conducting; The resistance of described 3rd resistance is greater than described 5th resistance.
2. discharge circuit according to claim 1, is characterized in that, described first switching tube and/or described second switch pipe are MOS.
3. discharge circuit according to claim 1, is characterized in that, described first switching tube and/or described second switch pipe are IGBT.
4. the discharge circuit according to claim 1,2 or 3, is characterized in that, described discharge circuit also comprises: input connects the positive pole of described dc-link capacitance through described 3rd resistance, exports the first gate-controlled switch of the negative pole of dc-link capacitance described in termination.
5. a charge-discharge circuit, is characterized in that, comprises the discharge circuit according to any one of charging circuit and claim 1-4;
Described charging circuit comprises the second gate-controlled switch, rectifier bridge and described 5th resistance, wherein:
The input of described rectifier bridge connects AC power through described second gate-controlled switch, and its positive output end connects the positive pole of described dc-link capacitance through described 5th resistance, its negative output terminal ground connection.
6. charge-discharge circuit according to claim 5, is characterized in that, described discharge circuit also comprises: the 6th resistance connecting the input of described 5th resistance and described first switching tube.
7. the charge-discharge circuit according to claim 5 or 6, is characterized in that, described charging circuit also comprises: be connected on the protection component on described charging circuit trunk roads.
8. charge-discharge circuit according to claim 7, is characterized in that, described protection component is fuse.
9. charge-discharge circuit according to claim 7, is characterized in that, described protection component is miniature circuit breaker.
10. an inverter, is characterized in that, comprises the discharge circuit according to any one of claim 1-4 or the charge-discharge circuit according to any one of claim 5-9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520175233.5U CN204517648U (en) | 2015-03-25 | 2015-03-25 | A kind of discharge circuit, charge-discharge circuit and inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520175233.5U CN204517648U (en) | 2015-03-25 | 2015-03-25 | A kind of discharge circuit, charge-discharge circuit and inverter |
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| CN204517648U true CN204517648U (en) | 2015-07-29 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105680678A (en) * | 2016-03-30 | 2016-06-15 | 合肥惠科金扬科技有限公司 | Discharge circuit and AC power supply device |
| CN108181842A (en) * | 2017-11-27 | 2018-06-19 | 珠海格力节能环保制冷技术研究中心有限公司 | Driver, driver control method and device |
| CN113037068A (en) * | 2021-05-07 | 2021-06-25 | 阳光电源股份有限公司 | Capacitor discharge circuit and power conversion circuit |
| CN113054637A (en) * | 2021-03-22 | 2021-06-29 | 上海空间电源研究所 | High-voltage discharge protection circuit for energy storage capacitor after shutdown of satellite load power supply |
| CN114444425A (en) * | 2022-04-07 | 2022-05-06 | 安徽威灵汽车部件有限公司 | Parameter determination method for discharge resistance between direct current buses and related device |
-
2015
- 2015-03-25 CN CN201520175233.5U patent/CN204517648U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105680678A (en) * | 2016-03-30 | 2016-06-15 | 合肥惠科金扬科技有限公司 | Discharge circuit and AC power supply device |
| CN105680678B (en) * | 2016-03-30 | 2019-01-18 | 合肥惠科金扬科技有限公司 | A kind of discharge circuit and AC power supply device |
| CN108181842A (en) * | 2017-11-27 | 2018-06-19 | 珠海格力节能环保制冷技术研究中心有限公司 | Driver, driver control method and device |
| CN113054637A (en) * | 2021-03-22 | 2021-06-29 | 上海空间电源研究所 | High-voltage discharge protection circuit for energy storage capacitor after shutdown of satellite load power supply |
| CN113054637B (en) * | 2021-03-22 | 2022-12-13 | 上海空间电源研究所 | High-voltage discharge protection circuit for energy storage capacitor after shutdown of satellite load power supply |
| CN113037068A (en) * | 2021-05-07 | 2021-06-25 | 阳光电源股份有限公司 | Capacitor discharge circuit and power conversion circuit |
| CN114444425A (en) * | 2022-04-07 | 2022-05-06 | 安徽威灵汽车部件有限公司 | Parameter determination method for discharge resistance between direct current buses and related device |
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