CN208299518U - A kind of electrolytic capacitor group pre-charge circuit - Google Patents
A kind of electrolytic capacitor group pre-charge circuit Download PDFInfo
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- CN208299518U CN208299518U CN201820967033.7U CN201820967033U CN208299518U CN 208299518 U CN208299518 U CN 208299518U CN 201820967033 U CN201820967033 U CN 201820967033U CN 208299518 U CN208299518 U CN 208299518U
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- electrolytic capacitor
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Abstract
The utility model provides a kind of electrolytic capacitor group pre-charge circuit, comprising: rectification circuit, input terminal are connected with ac bus, for providing DC charging voltage；At least two pre-charge resistances are connected with the output end of the rectification circuit, are connected on DC bus anode；Relay is controlled correspondingly with the pre-charge resistance, is connected in parallel on corresponding pre-charge resistance；With the one-to-one control relay circuit of the control relay, it is connected with corresponding control relay, for controlling the on-off of corresponding control relay, to realize the charge control of corresponding pre-charge resistance；Bus accumulator is arranged at least two pre-charge resistance rear end, is connected with the DC bus, for storing electric energy.The electrolytic capacitor group pre-charge circuit of the utility model can reduce surge current when charging, accelerate charging rate, reduces equipment and starts the time, and drops low-resistance power stress.
Description
Technical field
The utility model relates to the technical fields of electronic circuit, are pre-charged electricity more particularly to a kind of electrolytic capacitor group
Road.
Background technique
Electrolytic capacitor is one kind of capacitor, and metal foil is positive (aluminium or tantalum), and the oxidation film (oxygen of metal is close to anode
Change aluminium or tantalum pentoxide) be dielectric, cathode by conductive material, electrolyte (electrolyte can be liquid or solid) and other
Material collectively constitutes.Because electrolyte is the major part of cathode, therefore electrolytic capacitor is gained the name.Electrolytic capacitor unit volume
Capacitance is very big, and the capacitor than other types is big by tens to hundreds times；And specified capacity can be accomplished very greatly, it can be light
It is easy to do to tens of thousands of μ f even several f.
In large-scale electric power equipment, the bus capacitor of larger capacitance is generally required to maintain the normal operation of equipment.Compared with
Big bus capacitor can generate huge surge current in device power to influence the normal of power grid.Surge in the prior art
Electric current suppressing method is to add the pre-charge circuit of one or one group resistance after charging complete by electronically or mechanically switching after rectifying
By its short circuit, although surge current is eased, lengthened significantly the starting time of equipment, and higher pulse function
Rate gets higher the cost of resistance significantly.
Utility model content
In view of the foregoing deficiencies of prior art, the purpose of this utility model is to provide a kind of electrolytic capacitor group is pre-
Charging circuit can reduce surge current when charging, accelerate charging rate, reduces equipment and starts the time, and drops low-resistance
Power stress.
In order to achieve the above objects and other related objects, the utility model provides a kind of electrolytic capacitor group precharge electricity
Road, comprising: rectification circuit, input terminal are connected with ac bus, for providing DC charging voltage；At least two precharge electricity
Resistance, is connected with the output end of the rectification circuit, is connected on DC bus anode；It is one-to-one with the pre-charge resistance
Relay is controlled, is connected in parallel on corresponding pre-charge resistance；With the one-to-one control relay circuit of the control relay,
It is connected with corresponding control relay, for controlling the on-off of corresponding control relay, to realize corresponding pre-charge resistance
Charge control；Bus accumulator is arranged at least two pre-charge resistance rear end, is connected with the DC bus,
For storing electric energy.
In an embodiment of the present invention, the rectification circuit includes at least one rectifier bridge and an input capacitance；
The rectifier bridge includes two concatenated diodes, is connected on the ac bus；The input capacitance is connected to the friendship
It flows on bus.
In an embodiment of the present invention, the number of the rectifier bridge is 3.
In an embodiment of the present invention, the control relay circuit includes diode, NPN triode and temperature-sensitive electricity
Resistance；The anode of the diode is connected with power source for relay control anode, and cathode is connected with the collector of the NPN triode,
And the diode is connected with the input terminal of the control relay；Emitter and relay the control electricity of the NPN triode
Source cathode is connected, and base stage is connected with one end of the thermistor；The other end of the thermistor is connected with control voltage.
In an embodiment of the present invention, the thermistor of each control relay circuit is connected in series, and is connected in series
Described thermistor one end be connected with the base stage of a NPN triode, the other end is connected with master control voltage, the control voltage
For partial pressure of the master control voltage at each thermistor.
In an embodiment of the present invention, the control voltage of each control relay circuit is separately provided.
In an embodiment of the present invention, the bus accumulator include the first electrolytic capacitor, the second electrolytic capacitor,
Third electrolytic capacitor and the 4th electrolytic capacitor；First electrolytic capacitor in parallel and second electrolytic capacitor and institute in parallel
It is arranged between the positive and negative anodes of the DC bus after stating third electrolytic capacitor and the 4th electrolytic capacitor series connection.
As described above, the electrolytic capacitor group pre-charge circuit of the utility model, has the advantages that
(1) pre-charge resistance number is increased, and by each pre-charge resistance relay in parallel, thus with lesser punching
The pre-charging functions of electric current realization faster are hit, the preliminary filling electricity demanding of large-scale high capacity capacitor is met；
(2) lower to the power requirement of single pre-charge resistance；
(3) it can be full of entire bus capacitor at a high speed, substantially reduce surge impact when powering on；
(4) control is simple, practical.
Detailed description of the invention
Fig. 1 is shown as structural schematic diagram of the electrolytic capacitor group pre-charge circuit of the utility model in an embodiment；
Fig. 2 is shown as the control waveform diagram of the control relay of the utility model.
Specific embodiment
The embodiments of the present invention is illustrated by particular specific embodiment below, those skilled in the art can be by this
Content disclosed by specification understands other advantages and effect of the utility model easily.
It should be clear that this specification structure depicted in this specification institute accompanying drawings, ratio, size etc., only to cooperate specification to be taken off
The content shown is not intended to limit the utility model enforceable restriction item so that those skilled in the art understands and reads
Part, therefore do not have technical essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size are not influencing
Under the effect of the utility model can be generated and the purpose that can reach, should all still it fall in the revealed technology of the utility model
In the range of Rong get Neng is covered.Meanwhile it is cited such as "upper", "lower", "left", "right", " centre " and " one " in this specification
Deng term, be merely convenient to being illustrated for narration, rather than to limit the enforceable range of the utility model, relativeness
It is altered or modified, under the content of no substantial changes in technology, when being also considered as the enforceable scope of the utility model.
The electrolytic capacitor group pre-charge circuit of the utility model by an each pre-charge resistance relay in parallel, thus with
Lesser dash current realizes pre-charging functions faster, reduces equipment and starts the time, and drops low-resistance power stress.
In an embodiment, the electrolytic capacitor group pre-charge circuit of the utility model includes:
Rectification circuit, input terminal are connected with ac bus, for providing DC charging voltage.Wherein, the rectification circuit
Including at least one rectifier bridge and an input capacitance；The rectifier bridge includes two concatenated diodes, is connected to the friendship
It flows on bus；The input capacitance is connected on the ac bus, can be used for the energy storage of power supply.
At least two pre-charge resistances are connected with the output end of the rectification circuit, are connected on DC bus anode.
Relay is controlled correspondingly with the pre-charge resistance, is connected in parallel on corresponding pre-charge resistance.
With the one-to-one control relay circuit of the control relay, it is connected with corresponding control relay, is used for
The on-off of corresponding control relay is controlled, to realize the charge control of corresponding pre-charge resistance.Specifically, when the relay
When device control circuit controls control relay closure, corresponding pre-charge resistance stopping is bypassed, and stops charging；When described
When control relay circuit controls control relay opening, corresponding pre-charge resistance charges.
Bus accumulator is arranged at least two pre-charge resistance rear end, is connected with the DC bus, is used for
Store electric energy.Wherein, the bus accumulator includes one or more large-scale electrolysis capacitors for storing energy for rear class
Load uses.
The electrolytic capacitor group precharge of the utility model is further illustrated below with reference to specific embodiment shown in FIG. 1
Circuit.In this embodiment, the electrolytic capacitor group pre-charge circuit includes:
Rectification circuit, input terminal are connected with ac bus, including a six diode D1~D6 and capacitor C1.Wherein,
Diode D1 connects with diode D4, and diode D2 connects with diode D5, and diode D3 connects with diode D6, diode D1
It is connected with the linkage section of diode D4 with ac bus L1, the linkage section and ac bus L3 phase of diode D2 and diode D5
Even, diode D3 is connected with the linkage section of diode D6 with ac bus L2, thus by input voltage Ua, Uc of ac bus and
Ub is converted to DC voltage.Capacitor C1 charges simultaneously, realizes the energy storage of power supply.
Three pre-charge resistances PTC1, PTC2 and PTC3, are connected with the output end of the rectification circuit, are connected on direct current mother
On line anode DCP.
Relay RL1, RL2 and RL3 are controlled correspondingly with the pre-charge resistance, are connected in parallel on corresponding precharge electricity
It hinders on PTC1, PTC2 and PTC3.
With the one-to-one control relay circuit of described control relay RL1, RL2 and RL3, with corresponding control relay
Device RL1, RL2 are connected with RL3, for control it is corresponding control relay on-off, with realize corresponding pre-charge resistance PTC1,
The charge control of PTC2 and PTC3.In an embodiment of the present invention, the control relay circuit includes diode, NPN
Triode and thermistor；The anode of the diode is connected with power source for relay control anode, cathode and the NPN triode
Collector be connected, and the diode with it is described control relay input terminal be connected；The emitter of the NPN triode with
Power source for relay control cathode is connected, and base stage is connected with one end of the thermistor；The other end of the thermistor and control
Voltage processed is connected.For example, control relay circuit corresponding for control relay RL1, including diode Dr1, NPN triode
The anode of Tr1, thermistor Rr1, diode Dr1 are connected with power source for relay control positive (+12V), cathode and the NPN tri-
The collector of pole pipe Tr1 is connected, and diode Dr1 is connected with the input (i.e. the 1st end and the 2nd end) of the control relay；Institute
The emitter for stating NPN triode Tr1 is connected with power source for relay control cathode, one end phase of base stage and the thermistor Rr1
Even.Control the corresponding control relay circuit of relay RL2 and RL3 control relay circuit corresponding with control relay RL1
It is identical, therefore details are not described herein.
It should be noted that the control voltage of the thermistor can be separately provided, can also unify to be arranged.Uniformly set
When setting, the thermistor of each control relay circuit is connected in series, described thermistor one end of series connection and a NPN tri-
The base stage of pole pipe is connected, and the other end is connected with master control voltage, and the control voltage is the master control voltage in each temperature-sensitive
Partial pressure at resistance.
Bus accumulator is arranged at least two pre-charge resistance rear end, is connected with the DC bus, is used for
Store electric energy.Wherein, the bus accumulator may include one or more electrolytic capacitors.When including an electrolytic capacitor
When, it is arranged between the positive and negative anodes of the DC bus；When including two electrolytic capacitors, it is arranged after in parallel female in the direct current
Between the positive and negative anodes of line；When including four electrolytic capacitors, it is connected between the positive and negative anodes of the DC bus after parallel connection two-by-two.
The work for being pre-charged electric circuit below with reference to the electrolytic capacitor group that Fig. 2 briefly describes the utility model is former
Reason.Wherein t0It represents circuit and powers on moment, t1Represent control relay RL1 closing time, t2Represent control relay RL2 closure
Time, t3Represent control relay RL3 closing time.T0When the moment, input current is filled by pre-charge resistance PTC1~PTC3
Electricity, electric current is smaller, T1When the moment, S1 signal opens RL1, so that total charging resistor becomes smaller, electric current is increased, and accelerates charging, with
This analogizes under the end-state that charges, and only single PTC3 works on, and cuts off after charging to be done.
In conclusion the electrolytic capacitor group pre-charge circuit of the utility model increases pre-charge resistance number, and will
Each pre-charge resistance relay in parallel meets big to realize pre-charging functions faster with lesser dash current
The preliminary filling electricity demanding of type high capacity capacitor；It is lower to the power requirement of single pre-charge resistance；It can be full of entire bus at a high speed
Capacitor substantially reduces surge impact when powering on；Control is simple, practical.So the utility model effectively overcome it is existing
Various shortcoming in technology and have high industrial utilization value.
The above embodiments are only illustrative of the principle and efficacy of the utility model, and not for limitation, this is practical new
Type.Any person skilled in the art can all carry out above-described embodiment under the spirit and scope without prejudice to the utility model
Modifications and changes.Therefore, such as those of ordinary skill in the art without departing from the revealed essence of the utility model
All equivalent modifications or change completed under mind and technical idea, should be covered by the claim of the utility model.
Claims (7)
1. a kind of electrolytic capacitor group pre-charge circuit, it is characterised in that: include:
Rectification circuit, input terminal are connected with ac bus, for providing DC charging voltage；
At least two pre-charge resistances are connected with the output end of the rectification circuit, are connected on DC bus anode；
Relay is controlled correspondingly with the pre-charge resistance, is connected in parallel on corresponding pre-charge resistance；
With the one-to-one control relay circuit of the control relay, it is connected with corresponding control relay, for controlling
The on-off of corresponding control relay, to realize the charge control of corresponding pre-charge resistance；
Bus accumulator is arranged at least two pre-charge resistance rear end, is connected with the DC bus, for storing
Electric energy.
2. electrolytic capacitor group pre-charge circuit according to claim 1, it is characterised in that: the rectification circuit includes extremely
A few rectifier bridge and an input capacitance；The rectifier bridge includes two concatenated diodes, is connected to the ac bus
On；The input capacitance is connected on the ac bus.
3. electrolytic capacitor group pre-charge circuit according to claim 2, it is characterised in that: the number of the rectifier bridge is
3.
4. electrolytic capacitor group pre-charge circuit according to claim 1, it is characterised in that: the control relay circuit
Including diode, NPN triode and thermistor；The anode of the diode is connected with power source for relay control anode, cathode
It is connected with the collector of the NPN triode, and the diode is connected with the input terminal of the control relay；The NPN
The emitter of triode is connected with power source for relay control cathode, and base stage is connected with one end of the thermistor；The temperature-sensitive
The other end of resistance is connected with control voltage.
5. electrolytic capacitor group pre-charge circuit according to claim 4, it is characterised in that: each control relay circuit
Thermistor be connected in series, described thermistor one end of series connection is connected with the base stage of a NPN triode, the other end and
Master control voltage is connected, and the control voltage is partial pressure of the master control voltage at each thermistor.
6. electrolytic capacitor group pre-charge circuit according to claim 4, it is characterised in that: each control relay circuit
Control voltage be separately provided.
7. electrolytic capacitor group pre-charge circuit according to claim 1, it is characterised in that: the bus accumulator packet
Include the first electrolytic capacitor, the second electrolytic capacitor, third electrolytic capacitor and the 4th electrolytic capacitor；First electrolytic capacitor in parallel
It is arranged after connecting with second electrolytic capacitor with the third electrolytic capacitor in parallel and the 4th electrolytic capacitor described
Between the positive and negative anodes of DC bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820967033.7U CN208299518U (en) | 2018-06-22 | 2018-06-22 | A kind of electrolytic capacitor group pre-charge circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820967033.7U CN208299518U (en) | 2018-06-22 | 2018-06-22 | A kind of electrolytic capacitor group pre-charge circuit |
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| Publication Number | Publication Date |
|---|---|
| CN208299518U true CN208299518U (en) | 2018-12-28 |
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ID=64701698
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| CN201820967033.7U Active CN208299518U (en) | 2018-06-22 | 2018-06-22 | A kind of electrolytic capacitor group pre-charge circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113615031A (en) * | 2019-03-26 | 2021-11-05 | Tvs电机股份有限公司 | Vehicle pre-charging system |
| CN113964911A (en) * | 2021-11-02 | 2022-01-21 | 华羿微电子股份有限公司 | Multi-stage large-capacitance charging buffer circuit |
| WO2022121828A1 (en) * | 2020-12-08 | 2022-06-16 | 华为数字能源技术有限公司 | Power conversion circuit, control method for power conversion circuit, and transformer |
| WO2023155514A1 (en) * | 2022-02-15 | 2023-08-24 | 深圳市正浩创新科技股份有限公司 | Method for verifying buffer resistor, and terminal and storage medium |
-
2018
- 2018-06-22 CN CN201820967033.7U patent/CN208299518U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113615031A (en) * | 2019-03-26 | 2021-11-05 | Tvs电机股份有限公司 | Vehicle pre-charging system |
| WO2022121828A1 (en) * | 2020-12-08 | 2022-06-16 | 华为数字能源技术有限公司 | Power conversion circuit, control method for power conversion circuit, and transformer |
| US11909308B2 (en) | 2020-12-08 | 2024-02-20 | Huawei Digital Power Technologies Co., Ltd. | Power conversion circuit, method for controlling power conversion circuit, and transformer |
| CN113964911A (en) * | 2021-11-02 | 2022-01-21 | 华羿微电子股份有限公司 | Multi-stage large-capacitance charging buffer circuit |
| WO2023155514A1 (en) * | 2022-02-15 | 2023-08-24 | 深圳市正浩创新科技股份有限公司 | Method for verifying buffer resistor, and terminal and storage medium |
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| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: Room 1101-163, 323 Guoding Road, Yangpu District, Shanghai 200433 Patentee after: Shanghai Rujing Intelligent Control Technology Co.,Ltd. Address before: Room 1101-163, 323 Guoding Road, Yangpu District, Shanghai 200433 Patentee before: RUKING EMERSON CLIMATE TECHNOLOGIES (SHANGHAI) Co.,Ltd. |
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| CP03 | Change of name, title or address |