CN202957763U - Discharge circuit for inverter - Google Patents

Discharge circuit for inverter Download PDF

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Publication number
CN202957763U
CN202957763U CN 201220554779 CN201220554779U CN202957763U CN 202957763 U CN202957763 U CN 202957763U CN 201220554779 CN201220554779 CN 201220554779 CN 201220554779 U CN201220554779 U CN 201220554779U CN 202957763 U CN202957763 U CN 202957763U
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CN
China
Prior art keywords
resistance
discharge
inverter
switching tube
discharge circuit
Prior art date
Application number
CN 201220554779
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Chinese (zh)
Inventor
孙颖
周练文
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比亚迪股份有限公司
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Priority to CN 201220554779 priority Critical patent/CN202957763U/en
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Publication of CN202957763U publication Critical patent/CN202957763U/en

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Abstract

The utility model provides a discharge circuit for an inverter. The discharge circuit comprises a control circuit and a discharge branch in parallel connection with an energy storage capacitor at the DC side of the inverter. The control circuit comprises a first switch tube Q1, a resistor R5 and a resistor R6 , wherein the base electrode or grid of the first switch tube Q1 is connected with the power supply signal output end VCC 1 of the inverter, a collector electrode or drain electrode of the first switch tube Q1 is connected with the anode of the energy storage capacitor at the DC side through the resistor R6, an emitter electrode or source of the first switch tube Q1 is connected with the cathode of the energy storage capacitor at the DC side, and the resistor R5 is connected between the collector electrode or drain electrode of the first switch tube and the emitter electrode or source of the first switch tube. The discharge branch comprises a second switch tube Q2 and a discharge resistor R7, wherein the base electrode or grid of the second switch tube Q2 is connected with the collector electrode or drain electrode of the first switch tube Q2, the emitter electrode or source of the second switch tube Q1 is connected with the cathode of the energy storage capacitor at the DC side, and the collector electrode or drain electrode is connected with the anode of the energy storage capacitor at the DC side through the discharge resistor R7. The discharge circuit enables safe and reliable discharge of an inverter and is low in energy consumption.

Description

A kind of discharge circuit for inverter

Technical field

The utility model relates to a kind of discharge circuit, relates in particular to a kind of discharge circuit for inverter.

Background technology

All can use inverter in a large amount of electrical equipment that people use, inverter is generally used for direct current is converted to alternating current, and it has generally included the DC side storage capacitor in DC side.When inverter quits work, the electric energy be stored on the DC side storage capacitor need to discharge fast.Especially the higher inverter of changing voltage, it is when quitting work, and the danger that is stored in the electric energy on the DC side storage capacitor is larger.For example, can reduce the photovoltaic DC-to-AC converter of the consumption of the fossil energies such as oil, natural gas and coal, it needs the higher voltage of conversion usually, therefore, when the power supply that disconnects inverter quits work it, the electric energy by its DC side storage capacitor that need to be exceedingly fast discharges.For example; the inverter used in electric motor car and hybrid electric vehicle; the voltage of its input is higher than 100V; in order to protect personal safety; for passive discharge circuit; GB GB18488 require its in 120 seconds by below lower voltage to 60 volt of DC side storage capacitor, for the active discharge circuit, standard-required its in 5 seconds by below lower voltage to 60 volt of DC side storage capacitor.

So, for personal safety, after inverter is de-energized, can rapidly the electric energy of storing in the large electric capacity of DC side be bled off and seem very important.Referring to Fig. 1, its circuit structure that is the common capacitor discharge adopted in prior art.Directly the both positive and negative polarity of DC side storage capacitor C1 indirectly on resistance R1, consume the electric energy on this electric capacity by this resistance.After shutdown, by C1, R1 loop, to capacitor C 1 electric discharge, as long as the value of R1, C1 is suitable, the voltage on electric capacity can be put to safe voltage at the appointed time.When inverter normally moves, R1 is parallel to the two ends of C1 always, because C1 is on the input (BUS+ and BUS-) that directly is parallel to the DC side of inverter, be that voltage between BUS+ and BUS-directly loads on R1, so resistance R 1 is consuming electric energy always, this capacitor discharge mode makes energy loss larger.Simultaneously, because resistance R 1 is under high pressure worked for a long time, the easy excess Temperature of resistance R 1 and easily damage, therefore it has not only shortened the life-span of resistance R 1, also reduced the security reliability of inverter work simultaneously.

Be understandable that, the statement of this part only provides the background information relevant to the utility model, may form or not form so-called prior art.

Summary of the invention

Technical problem to be solved in the utility model be in prior art for the defect that security reliability is lower and energy consumption is larger of the discharge circuit of inverter, the discharge circuit for inverter that a kind of security reliability is high and energy consumption is lower is provided.

The utility model solves the technical scheme that its technical problem adopts and is to provide a kind of discharge circuit for inverter, and it comprises: all control circuit in parallel with the DC side storage capacitor of inverter and discharge paths; Described control circuit comprises: the first switching tube Q1, resistance R 5 and resistance R 6; The base stage of the first switching tube Q1 or grid meet the power supply signal output VCC1 of inverter, its collector electrode or drain electrode connect the positive pole of DC side storage capacitor by resistance R 6, its emitter or source electrode connect the negative pole of DC side storage capacitor, and resistance R 5 is connected between the collector electrode or drain electrode and the emitter or source electrode of the first switching tube of the first switching tube; Described discharge paths comprises: second switch pipe Q2 and discharge resistance R7; The base stage of second switch pipe Q2 or grid connect collector electrode or the drain electrode of the first switching tube Q1, and its emitter or source electrode connect the negative pole of DC side storage capacitor, and its collector electrode or drain electrode connect the positive pole of DC side storage capacitor by discharge resistance R7.

In above-mentioned discharge circuit, also comprise resistance R 2, it is connected between the base stage or grid of power supply signal output VCC1 and the first switching tube Q1.

In above-mentioned discharge circuit, also comprise resistance R 3, it is connected between the emitter or source electrode of power supply signal output VCC1 and the first switching tube Q1.

In above-mentioned discharge circuit, also comprise resistance R 4, it is connected between the base stage or grid of the collector electrode of the first switching tube Q1 or drain electrode and second switch pipe Q2.

In above-mentioned discharge circuit, also comprise fuse F1, it is connected between the collector electrode or drain electrode and discharge resistance R7 of second switch pipe Q2.

In above-mentioned discharge circuit, described the first switching tube is NPN type triode, and described second switch pipe is the N-type field effect transistor.

In above-mentioned discharge circuit, described the first switching tube is the N-type field effect transistor, and described second switch pipe is NPN type triode.

In above-mentioned discharge circuit, the resistance of described discharge resistance R7 is 1-100 kilohm.

In above-mentioned discharge circuit, the resistance of described resistance R 6 is greater than 500 kilohms.

In above-mentioned discharge circuit, the resistance of described resistance R 5 is greater than 200 kilohms.

The discharge circuit for inverter that the utility model provides, it carrys out the break-make of the second switch pipe in the controlled discharge branch road according to the switching on and shutting down of inverter by control circuit, thereby whether controlled discharge resistance is connected so that the electric energy on electric capacity is released on discharge resistance with the DC side storage capacitor.The break-make that is the first switching tube Q1 in control circuit is controlled by the power supply signal output, and then the break-make of second switch pipe Q2 in control circuit controlled discharge branch road, thereby the effectively work of controlled discharge resistance, therefore discharge resistance can be avoided under high pressure working for a long time, thereby discharge resistance can come safe and reliable work to make the safe and reliable of discharge circuit and inverter according to the start and stop of inverter, and has reduced the loss of energy on the discharge resistance.

The accompanying drawing explanation

Fig. 1 is the schematic diagram of DC side storage capacitor electric discharge in prior art;

The circuit diagram of the discharge circuit for inverter that Fig. 2 the utility model provides;

In the preferred embodiment that Fig. 3 the utility model provides for the circuit diagram of the discharge circuit of inverter.

Embodiment

Clearer for technical problem, technical scheme and beneficial effect that the utility model is solved, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.

In description of the present utility model, it will be appreciated that, term " vertically ", " laterally ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", orientation or the position relationship of indications such as " outward " are based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, rather than device or the element of indication or hint indication must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as restriction of the present utility model.

The discharge circuit that the utility model provides mainly comes the controlled discharge branch road to carry out work in needs by the break-make of the first switching tube and second switch pipe, thereby improves the security reliability of discharge circuit work and the loss of minimizing energy.

Shown in Figure 2, the discharge circuit for inverter that the utility model provides mainly comprises control circuit and discharge paths, and control circuit and discharge paths all in parallel with the DC side storage capacitor of inverter.Concrete, control circuit comprises: the first switching tube Q1, resistance R 5 and resistance R 6.The base stage of the first switching tube Q1 or grid meet the power supply signal output VCC1 of inverter, its collector electrode or drain electrode connect the positive pole (being also the electrode input end BUS+ of DC side) of DC side storage capacitor by resistance R 6, its emitter or source electrode connect the negative pole (being also the negative input BUS-of DC side) of DC side storage capacitor, and resistance R 5 is connected between the collector electrode or drain electrode and the emitter or source electrode of the first switching tube of the first switching tube.Discharge paths comprises: second switch pipe Q2 and discharge resistance R7; The base stage of second switch pipe Q2 or grid connect collector electrode or the drain electrode of the first switching tube Q1, and its emitter or source electrode connect the negative pole of DC side storage capacitor, and its collector electrode or drain electrode connect the positive pole of DC side storage capacitor by discharge resistance R7.

Referring to Fig. 2, the operation principle of the discharge circuit that the utility model provides is as follows:

When inverter works, its Switching Power Supply just can be worked normally, therefore the power supply signal output VCC1 of inverter will output voltage, now the first switching tube Q1 is just in conducting state, the voltage V1 of the collector electrode of the first switching tube Q1 or drain electrode place is dragged down (common V1 ≈ 0 herein), so the base stage of second switch pipe Q2 or the voltage V2 of grid are dragged down, therefore second switch pipe Q2 cut-off.So discharge resistance R7 is in vacant state, therefore when the DC side storage capacitor does not need to discharge during inverter work, the damage to discharge resistance of the energy loss of having avoided discharge resistance to bring and long-time high-pressure work.

When inverter is shut down, now on the DC side storage capacitor of inverter inside, still store a large amount of electric energy.Now because inverter is shut down, thus Switching Power Supply be not activated, therefore the voltage of power supply signal output VCC1 is about 0, so the voltage of the base stage of the first switching tube Q1 or grid is about 0, therefore the first switching tube Q1 cut-off.Voltage V1=the R5/(R5+R6 of the collector electrode of the first switching tube Q1 or drain electrode place) * V BUS, V2 ≈ R5/(R5+R6) and * V BUS, wherein, V BUSMagnitude of voltage for capacitor C 1 two ends.So when V2>Vth(Vth threshold voltage that is second switch pipe Q2) time, second switch pipe Q2 conducting, therefore discharge paths is started working, the electric energy of DC side storage capacitor C1 the inside starts electric discharge, V immediately by discharge resistance R7, Q2 BUSWill reduce, until V BUSWhen being reduced to V2 and being less than Vth, i.e. V BUS<Vth*(R5+R6)/and during R5, second switch pipe Q2 cut-off, discharge paths stops electric discharge.

What deserves to be explained is, above-mentioned the first switching tube and second switch pipe can play for common triode, field effect transistor etc. the element of on-off action.Preferably, the first switching tube is that NPN type triode and second switch pipe are the N-type field effect transistor, perhaps, the first switching tube is that N-type field effect transistor and second switch pipe are NPN type triode, thereby makes the first switching tube and second switch pipe according to the start and stop (being the variation of power supply signal output VCC1) of inverter, come the electric energy on control capacitance whether can be released into safe current potential by discharge resistance fast.Therefore discharge circuit can not discharge when inverter is worked, when not working, inverter makes immediately the electric discharge of DC side storage capacitor, thereby discharge circuit is reasonably discharged in needs, and then guaranteed fail safe and the reliability of discharge resistance and inverter work, and greatly reduced the energy consumption that discharge resistance brings.

Shown in Figure 3, preferably, discharge circuit also comprises resistance R 2, and it is connected between the base stage or grid of power supply signal output VCC1 and the first switching tube Q1, and resistance R 2 is mainly used in current limliting.Discharge circuit also comprises resistance R 3, and it is connected between the emitter or source electrode of power supply signal output VCC1 and the first switching tube Q1, and resistance R 3 is for the protection of the first switching tube Q1.More preferably, discharge circuit also comprises resistance R 4, and it is connected between the base stage or grid of the collector electrode of the first switching tube Q1 or drain electrode and second switch pipe Q2, and resistance R 4 is for current limliting.

In order better to protect discharge resistance R7 and inverter, preferably, discharge circuit also comprises fuse F1, and it is connected between the collector electrode or drain electrode and discharge resistance R7 of second switch pipe Q2.When excess Temperature appears in discharge resistance or burn out dangerous arranged, fuse F1 fuses to protect discharge resistance and discharge circuit.

For the inverter that need to be changed larger voltage, discharge resistance need to bear higher voltage, and takes into account its velocity of discharge, and preferably, the resistance of discharge resistance R7 is 1-100 kilohm.In like manner, resistance R 5 and R6 need higher withstand voltage, and preferably, the resistance of resistance R 6 is greater than 500 kilohms.The resistance of resistance R 5 is greater than 200 kilohms.

The discharge circuit that the utility model provides can be applied in a large amount of inverters, photovoltaic DC-to-AC converter for example, for example, because the voltage of solar panel is that variation along with intensity of sunshine changes.When sunshine intensity by by force when weak; the voltage of solar panel is also by high step-down; when panel voltage during lower than the under-voltage protection voltage set; inverter must be out of service; in the DC side storage capacitor, also store electric energy; now the first switching tube Q1 cut-off in control circuit, the second switch pipe Q2 conducting in discharge paths, discharge circuit starts electric discharge.(V in the time of in the voltage of DC side storage capacitor the inside is down to the safe voltage scope that human body can bear BUS<Vth*(R5+R6)/during R5), second switch pipe Q 2 cut-offs, discharge circuit stops electric discharge.

The discharge circuit that the utility model provides compared to existing technology, its adopt the first switching tube Q1, second switch pipe Q2, and discharge resistance R7 replaced original independently discharge resistance, can in reasonable time, work according to the on off control discharge circuit of inverter like this, thereby improved fail safe and the reliability of discharge resistance and discharge circuit work, and can reduce the thermal losses on discharge resistance.

In description of the present utility model, unless otherwise prescribed and limit, it should be noted that, term " installation ", " being connected ", " connection " should be done broad understanding, for example, can be mechanical connection or electrical connection, can be also the connection of two element internals, can be directly to be connected, and also can indirectly be connected by intermediary, for the ordinary skill in the art, can understand as the case may be the concrete meaning of above-mentioned term.

The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.

Claims (10)

1. the discharge circuit for inverter, is characterized in that, comprising: equal control circuit and discharge paths in parallel with the DC side storage capacitor C1 of inverter;
Described control circuit comprises: the first switching tube Q1, resistance R 5 and resistance R 6; The base stage of the first switching tube Q1 or grid meet the power supply signal output VCC1 of inverter, its collector electrode or drain electrode connect the positive pole of DC side storage capacitor by resistance R 6, its emitter or source electrode connect the negative pole of DC side storage capacitor, and resistance R 5 is connected between the collector electrode or drain electrode and the emitter or source electrode of the first switching tube of the first switching tube;
Described discharge paths comprises: second switch pipe Q2 and discharge resistance R7; The base stage of second switch pipe Q2 or grid connect collector electrode or the drain electrode of the first switching tube Q1, and its emitter or source electrode connect the negative pole of DC side storage capacitor, and its collector electrode or drain electrode connect the positive pole of DC side storage capacitor by discharge resistance R7.
2. discharge circuit as claimed in claim 1, is characterized in that, also comprises resistance R 2, and it is connected between the base stage or grid of power supply signal output VCC1 and the first switching tube Q1.
3. discharge circuit as claimed in claim 1 or 2, is characterized in that, also comprises resistance R 3, and it is connected between the emitter or source electrode of power supply signal output VCC1 and the first switching tube Q1.
4. discharge circuit as claimed in claim 1 or 2, is characterized in that, also comprises resistance R 4, and it is connected between the base stage or grid of the collector electrode of the first switching tube Q1 or drain electrode and second switch pipe Q2.
5. discharge circuit as claimed in claim 1, is characterized in that, also comprises fuse F1, and it is connected between the collector electrode or drain electrode and discharge resistance R7 of second switch pipe Q2.
6. discharge circuit as claimed in claim 1, is characterized in that, described the first switching tube is NPN type triode, and described second switch pipe is the N-type field effect transistor.
7. discharge circuit as claimed in claim 1, is characterized in that, described the first switching tube is the N-type field effect transistor, and described second switch pipe is NPN type triode.
8. discharge circuit as claimed in claim 1, is characterized in that, the resistance of described discharge resistance R7 is 1-100 kilohm.
9. discharge circuit as claimed in claim 1, is characterized in that, the resistance of described resistance R 6 is greater than 500 kilohms.
10. discharge circuit as claimed in claim 1, is characterized in that, the resistance of described resistance R 5 is greater than 200 kilohms.
CN 201220554779 2012-10-26 2012-10-26 Discharge circuit for inverter CN202957763U (en)

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Application Number Priority Date Filing Date Title
CN 201220554779 CN202957763U (en) 2012-10-26 2012-10-26 Discharge circuit for inverter

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Cited By (12)

* Cited by examiner, † Cited by third party
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
CN104682724A (en) * 2013-11-29 2015-06-03 佳能株式会社 Discharge circuit, information processing apparatus and discharge method
CN104980036A (en) * 2015-06-30 2015-10-14 广东欧珀移动通信有限公司 Fly-back switch power supply circuit
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
CN106130160A (en) * 2016-08-25 2016-11-16 苏州苏宝新能源科技有限公司 There is charging, control and the solar control system of discharging function
CN106208322A (en) * 2016-08-25 2016-12-07 苏州苏宝新能源科技有限公司 Have and control and the solar control system of discharging function
CN106300598A (en) * 2016-08-25 2017-01-04 苏州苏宝新能源科技有限公司 There is charging, control and the solar control system of discharging function
CN106300610A (en) * 2016-08-25 2017-01-04 苏州苏宝新能源科技有限公司 There is the solar control system of charging and discharging function
CN106300605A (en) * 2016-08-25 2017-01-04 苏州苏宝新能源科技有限公司 There is the solar control system of discharging function
CN107040129A (en) * 2017-05-03 2017-08-11 浙江埃菲生能源科技有限公司 A kind of discharge circuit of photovoltaic DC-to-AC converter
CN109802475A (en) * 2019-01-31 2019-05-24 大禹电气科技股份有限公司 A kind of self discharge system for storage capacitor
CN110247542A (en) * 2019-04-25 2019-09-17 珠海格力电器股份有限公司 For the discharge circuit of DC bus, driving plate and air conditioner

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104682724A (en) * 2013-11-29 2015-06-03 佳能株式会社 Discharge circuit, information processing apparatus and discharge method
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
CN104980036A (en) * 2015-06-30 2015-10-14 广东欧珀移动通信有限公司 Fly-back switch power supply circuit
CN104980036B (en) * 2015-06-30 2018-05-25 广东欧珀移动通信有限公司 A kind of inverse-excitation type switch power-supply circuit
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
CN106300610A (en) * 2016-08-25 2017-01-04 苏州苏宝新能源科技有限公司 There is the solar control system of charging and discharging function
CN106300598A (en) * 2016-08-25 2017-01-04 苏州苏宝新能源科技有限公司 There is charging, control and the solar control system of discharging function
CN106300605A (en) * 2016-08-25 2017-01-04 苏州苏宝新能源科技有限公司 There is the solar control system of discharging function
CN106208322A (en) * 2016-08-25 2016-12-07 苏州苏宝新能源科技有限公司 Have and control and the solar control system of discharging function
CN106130160A (en) * 2016-08-25 2016-11-16 苏州苏宝新能源科技有限公司 There is charging, control and the solar control system of discharging function
CN107040129A (en) * 2017-05-03 2017-08-11 浙江埃菲生能源科技有限公司 A kind of discharge circuit of photovoltaic DC-to-AC converter
CN109802475A (en) * 2019-01-31 2019-05-24 大禹电气科技股份有限公司 A kind of self discharge system for storage capacitor
CN110247542A (en) * 2019-04-25 2019-09-17 珠海格力电器股份有限公司 For the discharge circuit of DC bus, driving plate and air conditioner

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