CN103269154A - Direct current bus capacitor automatic discharge circuit for power electronic equipment - Google Patents
Direct current bus capacitor automatic discharge circuit for power electronic equipment Download PDFInfo
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- CN103269154A CN103269154A CN2013101580546A CN201310158054A CN103269154A CN 103269154 A CN103269154 A CN 103269154A CN 2013101580546 A CN2013101580546 A CN 2013101580546A CN 201310158054 A CN201310158054 A CN 201310158054A CN 103269154 A CN103269154 A CN 103269154A
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Abstract
The invention relates to a direct current bus capacitor automatic discharge circuit for power electronic equipment. The direct current bus capacitor automatic discharge circuit for the power electronic equipment comprises a bus over-voltage detecting unit, a driving protection unit, a discharge loop unit and a power supply unit. The input end of the bus over-voltage detecting unit is connected with a positive electrode VDC of a bus capacitor and the output end of the power supply unit. The input end of the driving protection unit is connected with the output end of the bus over-voltage detecting unit. The control end of the discharge loop unit is connected with the output end of the driving protection unit. The input end of the discharge loop unit is connected with the positive electrode VDC of the bus capacitor, and the other end of the discharge loop unit is connected with a reference ground of the bus capacitor. The power supply unit is connected with the positive electrode VDC of the bus capacitor, and the output end of the power supply unit is connected with the input end of the bus over-voltage detecting unit. The bus over-voltage detecting unit is used for detecting the bus voltage, when the bus voltage is larger than a given voltage, the driving protection unit starts the discharge loop unit, and then the bus voltage value is reduced. A pure hardware circuit is used for building the direct current bus capacitor automatic discharge circuit for the power electronic equipment, so that a system is safe and reliable, the direct current bus capacitor automatic discharge circuit for the power electronic equipment is simple in structure, an external auxiliary element is not needed, cost is low, and universality is high.
Description
Technical field
The present invention relates to a kind of power electronic equipment dc-link capacitance automatic discharge circuit.Belong to the distributed microgrid technical field of power generation of photovoltaic, relate in particular to a kind of power electronic equipment dc-link capacitance automatic discharge circuit.
Background technology
Based on the distributed microgrid power supply of the photovoltaic of dc bus, need a plurality of bus capacitor parallel connections to obtain sufficiently stable VD.Because the discontinuity of photovoltaic energy, and the finiteness of bearing power are easy to cause the unexpected increase of busbar voltage.The hysteresis quality of control system then, software control algorithm often can not be adjusted timely, and work gently then damages the electric capacity life-span for a long time, and is heavy then may cause that electric capacity explodes.
At present, the dc-link capacitance automatic discharge circuit adopts comparatively complicated control system to regulate often, or realizes discharging function by auxiliary circuit.There is the cost height in these methods, and coefficient of safety is low, and the risk of unfavorable application.
Summary of the invention
The objective of the invention is the characteristics at the dc-link capacitance automatic discharge circuit, provide a kind of cost low, the power electronic equipment that coefficient of safety is high dc-link capacitance automatic discharge circuit.
In order to achieve the above object, technical scheme of the present invention provides a kind of power electronic equipment dc-link capacitance automatic discharge circuit, it is characterized in that: comprise the bus overvoltage detecting unit, drive protected location, discharge loop unit and power supply unit.The anodal VDC of the input connection bus electric capacity of bus overvoltage detecting unit and the output of power supply unit; drive the output of the input termination bus overvoltage detecting unit of protected location; the control termination of discharge loop unit drives the output of protected location; the anodal VDC of its input connection bus electric capacity, the reference ground of the other end and bus capacitor links to each other.The anodal VDC of power supply unit and bus capacitor links to each other, and output links to each other with bus overvoltage detecting unit input.The bus overvoltage detecting unit detects busbar voltage, when busbar voltage during greater than given voltage, drives protected location and opens the discharge loop unit, thereby reduce bus voltage value.
Preferably, the bus overvoltage detecting unit comprises first resistance, the anodal V of an end connection bus electric capacity of first resistance
DC, the other end connects second resistance.Relatively end and the anode pin of the two ends of second resistance first electric capacity in parallel and first fiducial chip.The negative electrode of first fiducial chip connects the cathode output end of power supply unit.One end of second resistance links to each other with the 3rd resistance.One end of the 3rd resistance and the reference of bus capacitor ground link to each other.The POI of second resistance and the 3rd resistance is the delivery outlet of bus overvoltage detecting unit.Busbar voltage is relatively obtained the bus overvoltage situation by the partial pressure value Uc of second resistance and the reference voltage V ref of first fiducial chip; As Uc〉during Vref, first fiducial chip is open-minded, and power supply unit provides voltage, and the output end voltage that makes the bus overvoltage detecting unit is high level, thereby opens discharge loop.
Preferably, described driving protected location comprises the 6th resistance and second voltage stabilizing didoe.The anodal V of one termination bus capacitor of the 6th resistance
DCThe negative electrode of another termination second voltage stabilizing didoe.The negative electrode of second voltage stabilizing didoe links to each other with the control end of discharge loop unit.
Preferably, described discharge loop unit comprises the 7th resistance, the anodal V of a termination bus capacitor of the 7th resistance
DCThe other end links to each other with second power tube.When the bus overvoltage detecting unit was output as high level, second power tube was open-minded, and the discharge loop unit is the bus capacitor discharge by the 7th resistance.
Preferably, described power supply unit comprises first power tube, and the drain electrode of first power tube meets the anodal V of bus capacitor
DCWith an end of the 4th resistance, source electrode links to each other with the 5th resistance in addition, and gate pole links to each other with the other end of first voltage stabilizing didoe, second electric capacity and the 4th resistance.
Preferably, described first voltage stabilizing didoe also can be by the 5th NPN type triode, and the 13 resistance and the 3rd voltage stabilizing didoe constitute.
Advantage of the present invention is: adopt pure hardware circuit to build, system safety is reliable.Circuit structure is simple, need not outside auxiliary element, low, the highly versatile of cost.
Description of drawings
Fig. 1 is power electronic equipment provided by the invention dc-link capacitance automatic discharge circuit structured flowchart;
Fig. 2 the invention provides the physical circuit figure that a kind of power electronic equipment is used the dc-link capacitance automatic discharge circuit;
Fig. 3 is the another kind of physical circuit figure of power supply unit provided by the invention;
Embodiment
For the present invention is become apparent, now with a preferred embodiment, and conjunction with figs. is described below in detail.
The present invention is directed to the requirement of the distributed microgrid power supply of photovoltaic of dc bus, designed a kind of independence simple in structure, the power electronic equipment that cost is low dc-link capacitance automatic discharge circuit.This circuit structure comprises the bus overvoltage detecting unit, drives protected location, discharge loop unit and power supply unit as shown in Figure 1.The anodal V of the input connection bus electric capacity of bus overvoltage detecting unit
DCAnd the output of power supply unit, the output of the input termination bus overvoltage detecting unit of driving protected location, the control termination of discharge loop unit drives the output of protected location, the anodal V of its input connection bus electric capacity
DC, the reference ground of the other end and bus capacitor links to each other.The anodal V of power supply unit and bus capacitor
DCLink to each other, output links to each other with bus overvoltage detecting unit input.The bus overvoltage detecting unit detects busbar voltage, when busbar voltage during greater than given voltage, drives protected location and opens the discharge loop unit, thereby reduce bus voltage value.
Fig. 2 is the specific embodiment that a kind of power electronic equipment is used the dc-link capacitance automatic discharge circuit.Bus overvoltage detecting unit 101 comprises first resistance R, 1, the second resistance R, 2, the three resistance R, 3, the first capacitor C 1, and the first fiducial chip U1.Drive protected location 102, comprise the 6th resistance R 6 and the second voltage stabilizing didoe D2.Discharge loop unit 103 comprises the 7th resistance R 7, the seven resistance R 7.Power supply unit 104 comprises the first power tube Q1, the 4th resistance R 4, the five resistance R 5, the first voltage stabilizing didoe D1, second capacitor C 2 and the 4th resistance R 4.Busbar voltage is relatively obtained the bus overvoltage situation by the partial pressure value Uc of second resistance R 2 and the reference voltage V ref of the first fiducial chip U1; First capacitor C 1 plays filtering bus High-frequency Interference at the two ends that are attempted by second resistance R 2.As Uc〉during Vref, the negative electrode of the first fiducial chip U1 and anode conducting, power supply unit 104 provides electric current and makes it voltage to the 3rd resistance R 3 by U1 and is elevated to output voltage near power supply 104, thereby makes the second power tube Q2 conducting form discharge loop.Bus capacitor reduces bus capacitor voltage by discharge resistance R7 discharge.Voltage stabilizing didoe D2 plays the function of voltage-limiting protection, protects the gate pole of the second power tube Q2 not breakdown.
Power electronic equipment shown in Figure 2 comprises the first power tube Q1, the 4th resistance R 4, the five resistance R 5, the first voltage stabilizing didoe D1, second capacitor C 2 and the 4th resistance R 4 with the power supply unit 104 in the physical circuit of dc-link capacitance automatic discharge circuit.Busbar voltage is higher than the first voltage stabilizing didoe D1, voltage by clamped to given voltage Vz, the first power tube Q1 conducting, after the 5th resistance R 5 voltages were higher than given voltage Vz1, the first power tube Q1 turn-offed, thereby kept output voltage stabilization at given voltage Vz1.
Fig. 3 is the another kind of specific embodiment of power supply unit.This circuit comprises the 3rd power tube Q3, the 11 resistance R 11, the 12 resistance R 12, the 13 resistance R 13, the five positive-negative-positive triodes, the 3rd voltage stabilizing didoe D3 and the 4th capacitor C 4.During electrifying startup, busbar voltage begins conducting when being higher than the cut-in voltage of power tube Q3, resistance R 12 is output as high level, the 5th NPN type triode is open-minded, and at this moment, R12 and the 3rd voltage stabilizing didoe D3 form the loop, make the gate voltage of the 3rd power tube Q3 be stabilized in given voltage Vz2, when the output voltage of the 3rd power tube Q3 was higher than given voltage Vz2, pipe turn-offed, thereby keeps output voltage stabilization at given voltage Vz2.
The above only is preferred embodiments of the present invention, not in order to limiting the present invention, all any modifications of doing in the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a power electronic equipment dc-link capacitance automatic discharge circuit is characterized in that: comprise bus overvoltage detecting unit (101), drive protected location (102), discharge loop unit (103) and power supply unit (104).The anodal V of the input connection bus electric capacity of bus overvoltage detecting unit (101)
DCAnd the output of power supply unit (104); drive the output of the input termination bus overvoltage detecting unit (101) of protected location (102); the control termination of discharge loop unit (103) drives the output of protected location (102), the anodal V of its input connection bus electric capacity
DC, the reference ground of the other end and bus capacitor links to each other.The anodal VDC of power supply unit (104) and bus capacitor links to each other, and output links to each other with bus overvoltage detecting unit (101) input.Bus overvoltage detecting unit (101) detects busbar voltage, when busbar voltage during greater than given voltage, drives protected location (102) and opens discharge loop unit (103), thereby reduce bus voltage value.
2. a kind of power electronic equipment dc-link capacitance automatic discharge circuit as claimed in claim 1, it is characterized in that: described bus overvoltage detecting unit (101) comprises first resistance (R1), the anodal V of an end connection bus electric capacity of first resistance (R1)
DC, the other end connects second resistance (R2).Relatively end and the anode pin of the two ends of second resistance (R2) first electric capacity (C1) in parallel and first fiducial chip (U1).The negative electrode of first fiducial chip (U1) connects the cathode output end of power supply unit (104).One end of second resistance (R2) links to each other with the 3rd resistance (R3).One end of the 3rd resistance (R3) and the reference of bus capacitor ground link to each other.Second resistance (R2) is the delivery outlet of bus overvoltage detecting unit (101) with the POI of the 3rd resistance (R3).Busbar voltage is relatively obtained the bus overvoltage situation by the partial pressure value Uc of second resistance (R2) and the reference voltage V ref of first fiducial chip (U1); As Uc〉during Vref, (U1) is open-minded for first fiducial chip, and power supply unit (104) provides voltage, and the output end voltage that makes bus overvoltage detecting unit (101) is high level, thereby opens discharge loop.
3. bus overvoltage detecting unit as claimed in claim 2 (101) is characterized in that, described first electric capacity (C1) is selectable unit.
4. a kind of power electronic equipment dc-link capacitance automatic discharge circuit as claimed in claim 1 is characterized in that:
Described driving protected location (102) comprises the 6th resistance (R6) and second voltage stabilizing didoe (D2).The anodal V of one termination bus capacitor of the 6th resistance
DCThe negative electrode of another termination second voltage stabilizing didoe (D2).The negative electrode of second voltage stabilizing didoe (D2) links to each other with the control end of discharge loop unit (103).Wherein the 6th resistance (R6) is selectable unit for driving pull-up resistor.
5. a kind of power electronic equipment dc-link capacitance automatic discharge circuit as claimed in claim 1 is characterized in that:
Described discharge loop unit (103) comprises the 7th resistance (R7), the anodal V of a termination bus capacitor of the 7th resistance (R7)
DCThe other end links to each other with second power tube (Q2).When bus overvoltage detecting unit (101) when being output as high level, (Q2) is open-minded for second power tube, and discharge for bus capacitor by the 7th resistance (R7) discharge loop unit (103).
6. a kind of power electronic equipment dc-link capacitance automatic discharge circuit as claimed in claim 1 is characterized in that:
Described power supply unit (104) comprises first power tube (Q1), and the drain electrode of first power tube (Q1) meets the anodal V of bus capacitor
DCWith an end of the 4th resistance (R4), source electrode links to each other with the 5th resistance (R5) in addition, and gate pole links to each other with the other end of first voltage stabilizing didoe (D1), second electric capacity (C2) and the 4th resistance (R4).Wherein second electric capacity (C2) is selectable unit.
7. power supply unit as claimed in claim 6, it is characterized in that: described first voltage stabilizing didoe (D1) also can be by the 5th positive-negative-positive triode (Q5), and the 13 resistance (R13) and the 3rd voltage stabilizing didoe (D3) constitute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310158054.6A CN103269154B (en) | 2013-04-27 | 2013-04-27 | A kind of power electronic equipment dc-link capacitance automatic discharge circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310158054.6A CN103269154B (en) | 2013-04-27 | 2013-04-27 | A kind of power electronic equipment dc-link capacitance automatic discharge circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103269154A true CN103269154A (en) | 2013-08-28 |
| CN103269154B CN103269154B (en) | 2018-05-29 |
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| CN201310158054.6A Expired - Fee Related CN103269154B (en) | 2013-04-27 | 2013-04-27 | A kind of power electronic equipment dc-link capacitance automatic discharge circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109412113A (en) * | 2018-12-13 | 2019-03-01 | 国网河南省电力公司洛阳供电公司 | A kind of portable small bus jump exchange device |
| CN112103922A (en) * | 2020-08-13 | 2020-12-18 | 珠海格力电器股份有限公司 | Power supply protection device, method and driver |
| CN113471942A (en) * | 2020-03-30 | 2021-10-01 | 台达电子企业管理（上海）有限公司 | Power supply device with protection circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101971474A (en) * | 2008-02-20 | 2011-02-09 | 莫斯科技株式会社 | Magnetic energy recovery switech having protective circuit |
| CN102868231A (en) * | 2011-07-08 | 2013-01-09 | 三星电机株式会社 | Electric energy storage apparatus, voltage equalization module and voltage equalization method |
-
2013
- 2013-04-27 CN CN201310158054.6A patent/CN103269154B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101971474A (en) * | 2008-02-20 | 2011-02-09 | 莫斯科技株式会社 | Magnetic energy recovery switech having protective circuit |
| CN102868231A (en) * | 2011-07-08 | 2013-01-09 | 三星电机株式会社 | Electric energy storage apparatus, voltage equalization module and voltage equalization method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109412113A (en) * | 2018-12-13 | 2019-03-01 | 国网河南省电力公司洛阳供电公司 | A kind of portable small bus jump exchange device |
| CN109412113B (en) * | 2018-12-13 | 2023-08-25 | 国网河南省电力公司洛阳供电公司 | Portable small bus jumping device |
| CN113471942A (en) * | 2020-03-30 | 2021-10-01 | 台达电子企业管理（上海）有限公司 | Power supply device with protection circuit |
| CN112103922A (en) * | 2020-08-13 | 2020-12-18 | 珠海格力电器股份有限公司 | Power supply protection device, method and driver |
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| Publication number | Publication date |
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| CN103269154B (en) | 2018-05-29 |
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Granted publication date: 20180529 Termination date: 20190427 |