CN204131422U - Photovoltaic DC-to-AC converter bus capacitor discharge protection circuit - Google Patents
Photovoltaic DC-to-AC converter bus capacitor discharge protection circuit Download PDFInfo
- Publication number
- CN204131422U CN204131422U CN201420584852.5U CN201420584852U CN204131422U CN 204131422 U CN204131422 U CN 204131422U CN 201420584852 U CN201420584852 U CN 201420584852U CN 204131422 U CN204131422 U CN 204131422U
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- CN
- China
- Prior art keywords
- triode
- bus capacitor
- resistor
- pull
- emitter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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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- Inverter Devices (AREA)
Abstract
The utility model provides a kind of photovoltaic DC-to-AC converter bus capacitor discharge protection circuit, one end of first input resistance is connected with the base stage of the first triode, the collector electrode of the first triode is connected with one end of the first pull-up resistor, the other end of the first pull-up resistor is connected with the anode of bus capacitor, the emitter of the first triode is connected with one end of the second input resistance, the other end of the second input resistance is connected with the base stage of the first triode, the base stage of the second triode is connected with the collector electrode of the first triode, the collector electrode of the second triode is connected with one end of the second pull-up resistor, the other end of the second pull-up resistor is connected with the anode of bus capacitor, the emitter of the second triode is connected with the emitter of the first triode, the negative electrode of bus capacitor is connected with the emitter of the second triode.This discharge protection circuit is when photovoltaic inverter system is run, and discharge circuit and converter main circuit disconnect, and not influential system work, therefore without excess loss.
Description
Technical field
The utility model relates to a kind of protective circuit, particularly relates to a kind of photovoltaic DC-to-AC converter bus capacitor discharge protection circuit.
Background technology
In high-power photovoltaic inverter, need bus capacitor to carry out supporting bus voltage, and general bus capacitor voltage is higher, capacity is comparatively large, and when after system closedown, bus still residual charge, so need discharge circuit to discharge electric charge, to avoid Danger Electric shock risk occurs.At present, conventional discharge mode is a resistance in parallel on bus capacitor, but when system works, this resistance meeting consumed energy, makes the loss of system increase, how to reduce the technical problem that system loss is badly in need of solving to become those skilled in the art.
Semiconductor transistor is adopted to carry out controlled discharge circuit; without the need to the control circuit of complexity; system loss is little; a kind of circuit structure very with researching value and development prospect, if semiconductor transistor can be adopted effectively will to reduce the loss of system as the discharge protection circuit of photovoltaic DC-to-AC converter bus capacitor.
Utility model content
The shortcoming of prior art in view of the above, the purpose of this utility model is to provide a kind of photovoltaic DC-to-AC converter bus capacitor discharge protection circuit that effectively can reduce system loss.
For achieving the above object and other relevant objects, the utility model provides a kind of photovoltaic DC-to-AC converter bus capacitor discharge protection circuit, it comprises: the first triode, second triode, first pull-up resistor, second pull-up resistor, first input resistance, second input resistance, bus capacitor, one end of described first input resistance is connected with signal input part, the other end of the first input resistance is connected with the base stage of the first triode, the collector electrode of the first triode is connected with one end of the first pull-up resistor, the other end of the first pull-up resistor is connected with the anode of bus capacitor, the emitter of the first triode is connected with one end of the second input resistance, the other end of the second input resistance is connected with the base stage of the first triode, the base stage of the second triode is connected with the collector electrode of the first triode, the collector electrode of the second triode is connected with one end of the second pull-up resistor, the other end of the second pull-up resistor is connected with the anode of bus capacitor, the emitter of the second triode is connected with the emitter of the first triode, the negative electrode of bus capacitor is connected with the emitter of the second triode.
As mentioned above, photovoltaic DC-to-AC converter bus capacitor discharge protection circuit of the present utility model has following beneficial effect: in this photovoltaic DC-to-AC converter bus capacitor discharge protection circuit course of work, when photovoltaic inverter system is run, outer signals is high level, first triode is saturated, second triode cut-off, would not discharge to bus capacitor like this; Outer signals disappears when the system is shut down, and bus capacitor has voltage, and the first triode cut-off, the second triode is saturated, and the second pull-up resistor discharges to bus capacitor.This discharge protection circuit tool has the following advantages: when (1) photovoltaic inverter system is run, discharge circuit and converter main circuit disconnect, and not influential system work, therefore without excess loss; (2) this discharge protection circuit utilizes semiconductor controlled discharge connecting and disconnecting of the circuit, and circuit is simple, is easy to control, simple and reliable.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the utility model embodiment.
Circuit state schematic diagram when Fig. 2 is the utility model embodiment system cloud gray model.
Circuit state schematic diagram when Fig. 3 is the utility model embodiment system closing.
Embodiment
Below by way of specific instantiation, execution mode of the present utility model is described, those skilled in the art the content disclosed by this specification can understand other advantages of the present utility model and effect easily.The utility model can also be implemented or be applied by embodiments different in addition, and the every details in this specification also can based on different viewpoints and application, carries out various modification or change not deviating under spirit of the present utility model.
Refer to Fig. 1,2,3.It should be noted that, the diagram provided in the present embodiment only illustrates basic conception of the present utility model in a schematic way, then only the assembly relevant with the utility model is shown in graphic but not component count, shape and size when implementing according to reality is drawn, it is actual when implementing, and the kenel of each assembly, quantity and ratio can be a kind of change arbitrarily, and its assembly layout kenel also may be more complicated.
As shown in Figure 1, the utility model provides the photovoltaic DC-to-AC converter bus capacitor discharge protection circuit of a kind of example, and it comprises the first triode Q
1, the second triode Q
2, the first pull-up resistor R
1, the second pull-up resistor R
2, the first input resistance R
b1, the second input resistance R
b2, bus capacitor C, concrete connected mode is, the first input resistance R
b1one end be connected with outer signals input, the first input resistance R
b1the other end and the first triode Q
1base stage connect, the first triode Q
1collector electrode and the first pull-up resistor R
1one end connect, R
1the other end be connected with the anode of bus capacitor C, the first triode Q
1emitter and the second input resistance R
b2one end connect, the second input resistance R
b2the other end and the first triode Q
1base stage connect, the second triode Q
2base stage and the first triode Q
1collector electrode connect, the second triode Q
2collector electrode and the second pull-up resistor R
2one end connect, the second pull-up resistor R
2the other end be connected with the anode of bus capacitor C, the second triode Q
2emitter and the first triode Q
1emitter connect, the negative electrode of bus capacitor and the second triode Q
2emitter connect.
When photovoltaic inverter system is run, outer signals is high level, the saturated Q of the first triode
1, the second triode cut-off Q
2, would not discharge to bus capacitor (as shown in black line thick in Fig. 2) like this; Outer signals disappears when the system is shut down, and bus capacitor C has voltage, the first triode Q
1cut-off, the second triode Q
2saturated, the second pull-up resistor R2 discharges (as shown in black line thick in Fig. 2) to bus capacitor C.
This discharge protection circuit tool has the following advantages: when (1) photovoltaic inverter system is run, discharge circuit and converter main circuit disconnect, and not influential system work, therefore without excess loss; (2) this discharge protection circuit utilizes semiconductor controlled discharge connecting and disconnecting of the circuit, and circuit is simple, is easy to control, simple and reliable.So the utility model effectively overcomes various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present utility model and effect thereof only, but not for limiting the utility model.Any person skilled in the art scholar all without prejudice under spirit of the present utility model and category, can modify above-described embodiment or changes.Therefore, such as have in art and usually know that the knowledgeable modifies or changes not departing from all equivalences completed under the spirit and technological thought that the utility model discloses, must be contained by claim of the present utility model.
Claims (1)
1. a photovoltaic DC-to-AC converter bus capacitor discharge protection circuit, is characterized in that, it comprises: the first triode (Q
1), the second triode (Q
2), the first pull-up resistor (R
1), the second pull-up resistor (R
2), the first input resistance (R
b1), the second input resistance (R
b2), bus capacitor (C), described first input resistance (R
b1) one end be connected with signal input part, the first input resistance (R
b1) the other end and the first triode (Q
1) base stage connect, the first triode (Q
1) collector electrode and the first pull-up resistor (R
1) one end connect, the first pull-up resistor (R
1) the other end be connected with the anode of bus capacitor (C), the first triode (Q
1) emitter and the second input resistance (R
b2) one end connect, the second input resistance (R
b2) the other end and the first triode (Q
1) base stage connect, the second triode (Q
2) base stage and the first triode (Q
1) collector electrode connect, the second triode (Q
2) collector electrode and the second pull-up resistor (R
2) one end connect, the second pull-up resistor (R
2) the other end be connected with the anode of bus capacitor (C), the second triode (Q
2) emitter and the first triode (Q
1) emitter connect, the negative electrode of bus capacitor (C) and the second triode (Q
2) emitter connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420584852.5U CN204131422U (en) | 2014-10-10 | 2014-10-10 | Photovoltaic DC-to-AC converter bus capacitor discharge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420584852.5U CN204131422U (en) | 2014-10-10 | 2014-10-10 | Photovoltaic DC-to-AC converter bus capacitor discharge protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204131422U true CN204131422U (en) | 2015-01-28 |
Family
ID=52387739
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420584852.5U Expired - Fee Related CN204131422U (en) | 2014-10-10 | 2014-10-10 | Photovoltaic DC-to-AC converter bus capacitor discharge protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204131422U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242702A (en) * | 2014-10-10 | 2014-12-24 | 苏州弘鹏新能源有限公司 | Busbar capacitance discharge protection circuit of photovoltaic inverter |
| CN113097984A (en) * | 2021-04-29 | 2021-07-09 | 珠海格力电器股份有限公司 | Energy storage discharge circuit, variable frequency drive circuit, variable frequency motor and electric equipment |
-
2014
- 2014-10-10 CN CN201420584852.5U patent/CN204131422U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242702A (en) * | 2014-10-10 | 2014-12-24 | 苏州弘鹏新能源有限公司 | Busbar capacitance discharge protection circuit of photovoltaic inverter |
| CN113097984A (en) * | 2021-04-29 | 2021-07-09 | 珠海格力电器股份有限公司 | Energy storage discharge circuit, variable frequency drive circuit, variable frequency motor and electric equipment |
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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 |
Granted publication date: 20150128 Termination date: 20181010 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |