CN206517305U - A kind of power conversion circuit - Google Patents
A kind of power conversion circuit Download PDFInfo
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- CN206517305U CN206517305U CN201720130407.5U CN201720130407U CN206517305U CN 206517305 U CN206517305 U CN 206517305U CN 201720130407 U CN201720130407 U CN 201720130407U CN 206517305 U CN206517305 U CN 206517305U
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- power conversion
- circuit
- conversion circuit
- absorption
- capacitor
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Abstract
The utility model discloses a kind of power conversion circuit, the power conversion circuit includes rectification module (1), inductor (2), capacitor (3), the first inverter circuit (4) and control module (5), absorbing circuit (7) is connected with stabilizing inducatnce (8), and the entirety after series connection is in parallel with capacitor (3).The beneficial effects of the utility model are：(1) stabilizing inducatnce is added on absorbing circuit so that when the power conversion circuit was becoming big at upper electric moment or busbar voltage rapidly, the electric current on absorbing circuit will not increase rapidly, and absorbing circuit is played a protective role；(2) three-phase alternating current is exported to more motors using a set of power conversion circuit, saves circuit cost.
Description
Technical field
The utility model is related to field of air conditioning, is specifically related to a kind of power conversion circuit.
Background technology
In the prior art, as shown in figure 1, air-conditioning power conversion circuit includes rectification module 1, inductor 2, capacitor 3, the
One inverter circuit 4 and control module 5, the inductor 2 are connected with AC power 9, and capacitor 3 is gone here and there with the rectification module 1
Connection, first inverter circuit 4 is arranged in parallel on capacitor 3, and the control module 5 is connected with first inverter circuit 4,
For controlling the output of the first inverter circuit 4 three-phase alternating current, first inverter circuit 4 is connected with the first motor 6, described
The three-phase alternating current of first inverter circuit 4 output is used to drive first motor 6 to run.When the first motor 6 is shut down suddenly,
Because the electric current that the electric current in inductor 2 can not be changed into 0, inductor 2 moment still charges to capacitor 3, this can cause
Overtension on capacitor 3, easily occurs the breakdown danger of capacitor 3, or due to accessing the unstable of civil power, also can
Cause the electric current in inductor 2 is excessive to cause to overcharge capacitor 3, capacitor 3 is caused to damage.
In order to overcome above mentioned problem, Japanese Unexamined Patent Publication 2005-20836 publications provide a kind of power conversion circuit, such as should
In patent shown in Fig. 7, on the basis of existing technology, absorbing circuit is connected into by diode Ds, resistance Rs, electric capacity Cs, it is described
Absorbing circuit is arranged in parallel on electric capacity C, so, and when electric capacity C is electrically charged and raises its voltage, the absorbing circuit can
Electric current is absorbed, and then reduces the voltage on electric capacity C.Also, electric capacity Cs is electrochemical capacitor, electrolytic capacitor Cs charging voltage
It is smoothed as substantially constant.Electrolytic capacitor Cs can act as the power supply for the circuit being driven with fixed voltage.
But the circuit when becoming big at upper electric moment, or busbar voltage rapidly, and Cs can form very big charging current, hold
Fragile device, it is necessary to just can guarantee that electric current will not be excessive using the Rs of larger resistance, and larger resistance can cause circuit to damage
Consumption is bigger than normal.
The content of the invention
A purpose of the present utility model is to provide a kind of power conversion circuit so that when the power conversion circuit exists
When upper electric moment or busbar voltage become big rapidly, the electric current on absorbing circuit will not increase rapidly.
Specifically, the utility model is achieved by the following technical solution：
A kind of power conversion circuit, the power conversion circuit includes rectification module, inductor, capacitor, the first inversion
Circuit and control module, the inductor are connected with AC power, and the capacitor is connected with the rectification module, and described
One inverter circuit is arranged in parallel on the capacitor, and the control module is connected with first inverter circuit, described for controlling
First inverter circuit exports three-phase alternating current, first inverter circuit and the first motor connection, and first inverter circuit is defeated
The three-phase alternating current gone out be used for drive first motor operation, absorbing circuit is connected with stabilizing inducatnce, the entirety after series connection and
Capacitor is in parallel.
Preferably, the absorbing circuit only includes the first absorption resistance.
Preferably, the absorbing circuit is the cascaded structure of the first absorption resistance and Absorption Capacitance.
Preferably, the absorbing circuit is the parallel-connection structure of the first absorption resistance and Absorption Capacitance.
Preferably, the first absorption resistance is in parallel with Absorption Capacitance, doublet is formed, the doublet absorbs electricity with second again
Resistance series connection, forms the absorbing circuit.
Preferably, going back series diode on the second absorption resistance, the diode is arranged such that from rectification module
The electric current of middle output by and flow into absorbing circuit.
Preferably, the control module includes control device, DC/DC modules, PWM generator, the DC/DC modules and control
Device connection processed, for providing low-voltage DC to the control device, the control device is connected with the first PWM generator,
For controlling the PWM generator to generate satisfactory PWM waveform, first PWM generator and the first inverter circuit connect
Connect, for inputting PWM waveform to first inverter circuit.
Preferably, the Absorption Capacitance is electrochemical capacitor, the charging voltage of the Absorption Capacitance is smoothed as substantially constant,
The DC/DC wired in parallel is on Absorption Capacitance.
Preferably, one or more inverter circuits are connected in parallel on the Absorption Capacitance.
Preferably, the control device controls one or more of inverter circuits by the PWM generator of respective numbers
Generate three-phase alternating current.
The beneficial effects of the utility model are：(1) stabilizing inducatnce is added on absorbing circuit so that when the power becomes
Circuit is changed when becoming big rapidly at upper electric moment or busbar voltage, the electric current on absorbing circuit will not increase rapidly, to absorbing electricity
Road plays a protective role；(2) using a set of power conversion circuit to more motors export three-phase alternating current, save circuit into
This.
Brief description of the drawings
, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
Or the accompanying drawing used required in description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is some embodiments of the present utility model, for those of ordinary skill in the art, is not paying the premise of creative work
Under, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is existing power conversion circuit structural representation；
A kind of power conversion circuit structural representation that Fig. 2 provides for the utility model first embodiment；
A kind of power conversion circuit structural representation that Fig. 3 provides for the utility model second embodiment；
A kind of power conversion circuit structural representation that Fig. 4 provides for the utility model 3rd embodiment；
A kind of power conversion circuit structural representation that Fig. 5 provides for the utility model fourth embodiment；
A kind of power conversion circuit structural representation that Fig. 6 provides for the embodiment of the utility model the 5th；
A kind of power conversion circuit structural representation that Fig. 7 provides for the utility model sixth embodiment；
A kind of power conversion circuit structural representation that Fig. 8 provides for the embodiment of the utility model the 7th.
Description of reference numerals
Further clearly to illustrate the annexation between structure of the present utility model and each part, give following attached
Icon is remembered, and is illustrated.
1st, rectification module；2nd, inductor；3rd, capacitor；4th, the first inverter circuit；5th, control module；51st, control device；
52nd, DC/DC modules；53rd, PWM generator；6th, the first motor；7th, absorbing circuit；71st, the first absorption resistance；72nd, Absorption Capacitance；
73rd, the second absorption resistance；74th, diode；8th, stabilizing inducatnce；9th, AC power；10th, the second inverter circuit；11st, the second motor.
By above-mentioned description of reference numerals, with reference to embodiment of the present utility model, it can be more clearly understood from and illustrate
The technical solution of the utility model.
Embodiment
Here exemplary embodiment will be illustrated in detail, its example is illustrated in the accompanying drawings.Following description is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the utility model.On the contrary, they be only with such as
The example of the consistent apparatus and method of some aspects being described in detail in appended claims, of the present utility model.
The term used in the utility model is the purpose only merely for description specific embodiment, and is not intended to be limiting this reality
With new." one kind ", " described " and "the" of singulative used in the utility model and appended claims
It is intended to include most forms, unless context clearly shows that other implications.It is also understood that term used herein " and/
Or " refer to and may be combined comprising one or more associated any or all of project listed.
It will be appreciated that though various information may be described using term first, second, third, etc. in the utility model,
But these information should not necessarily be limited by these terms.These terms are only used for same type of information being distinguished from each other out.For example, not
In the case of departing from the utility model scope, the first information can also be referred to as the second information, similarly, and the second information can also
It is referred to as the first information.Depending on linguistic context, word as used in this " if " can be construed to " ... when " or
" when ... " or " in response to determining ".
The utility model will be described in detail by embodiment below.
A kind of power conversion circuit, as shown in Fig. 2 the power conversion circuit includes rectification module 1, inductor 2, electric capacity
Device 3, the first inverter circuit 4 and control module 5, the inductor 2 are connected with AC power 9, the capacitor 3 with it is described whole
Flow module 1 is connected, and first inverter circuit 4 is arranged in parallel on capacitor 3, the control module 5 and first inversion
Circuit 4 is connected, for controlling the output of the first inverter circuit 4 three-phase alternating current, the motor of the first inverter circuit 4 and first
6 connections, the three-phase alternating current that first inverter circuit 4 is exported is used to drive first motor 6 to run, absorbing circuit 7 with
Capacitor 3 is in parallel.
The absorbing circuit 7 has the effect of mutation current on absorption inductor device 2.Due to input ac voltage fluctuation or
Situations such as motor is stopped suddenly can cause the electric current on inductor 2 to increase suddenly, and increased electric current will be absorbed by described
Circuit 7 absorbs, and then avoids increased electric current further towards capacitor 3 so as to cause the voltage on dc bus to increase,
So that capacitor 3 is breakdown, the damage of the power conversion circuit is caused.Further, on the absorbing circuit 7, also go here and there
Join stabilizing inducatnce 8.
In one embodiment of the present utility model, as shown in figure 3, the absorbing circuit 7 only has the first absorption resistance 71,
First absorption resistance 71 is consumed the electric current flowed out from inductor 2, and then increased electricity on absorption inductor device 2
Stream.
In another embodiment of the present utility model, as shown in figure 4, the absorbing circuit 7 is the first absorption resistance 71
With the cascaded structure of Absorption Capacitance 72, first absorption resistance 71 is consumed the electric current flowed out from inductor 2, described
Absorption Capacitance 72 is further stored increased electric current, and then increased electric current on absorption inductor device 2.
In another embodiment of the present utility model, as shown in figure 5, the absorbing circuit 7 is the first absorption resistance 71
With the parallel-connection structure of Absorption Capacitance 72, so, an increased electric current part is consumed by the first absorption resistance 71 on inductor 2, separately
A part is stored by Absorption Capacitance 72, further increases the current sink capability of absorbing circuit, also, when the absorbing circuit
7 from when accessing disconnection at switch 8, and the electric energy stored in Absorption Capacitance 72 can also be consumed by the first absorption resistance 71,
So that Absorption Capacitance 72 is when carrying out electric current absorption next time, the ability that its electric current absorbs with being consistent before.
In another embodiment of the present utility model, as shown in fig. 6, the first absorption resistance 71 and Absorption Capacitance 72 are simultaneously
Connection, forms doublet, and the doublet is connected with the second absorption resistance 73 again, forms the absorbing circuit, and electricity is absorbed with first
Resistance 71 is compared with the absorbing circuit in parallel formed of Absorption Capacitance 72, and the absorbing circuit of the present embodiment can not only make Absorption Capacitance 72
When carrying out electric current absorption next time, the ability that its electric current absorbs with being consistent before, additionally it is possible to passes through the second absorption resistance 73
Further consume electric energy, it is to avoid because increased electric current is excessive and absorbing circuit is caused to damage in inductance 2.
In another embodiment of the present utility model, as shown in fig. 7, it is characterized in that, compared to the implementation shown in Fig. 6
Example, goes back series diode 74 on the second absorption resistance 73, and the diode 74 is arranged such that and exported from rectification module
Electric current pass through the diode, flow into absorbing circuit 7.In this embodiment, the control module 5 includes control device 51, DC/
DC modules 52, PWM generator 53, the DC/DC modules 52 are connected with control device 51, for being provided to the control device 51
Low-voltage DC, the control device 51 is further connected with the first PWM generator 53, for controlling the PWM generator 53
Satisfactory PWM waveform is generated, first PWM generator 53 is further connected with the first inverter circuit 4, for described
First inverter circuit 4 inputs PWM waveform, and then controls first inverter circuit 4 to export satisfactory three to the first motor 6
Cross streams electricity, it is preferred that the control device 51 is single-chip microcomputer.Wherein, the DC/DC modules 52 are connected in parallel on Absorption Capacitance 72
On, Absorption Capacitance 72 is electrochemical capacitor, and the charging voltage of the electrochemical capacitor is smoothed as substantially constant, and then the DC/DC moulds
Input direct voltage of the block 52 by the use of the voltage on the Absorption Capacitance 72 as DC/DC modules 52.Further, such as Fig. 8 institutes
Show, second inverter circuit 10 also in parallel on the Absorption Capacitance 72, second inverter circuit 10 is used for connected
Second motor 11 exports three-phase alternating current.The control device 51 is also connected with the second PWM generator 54, and the 2nd PWM occurs
Device 54 is further connected with the second inverter circuit 10, for inputting PWM waveform to second inverter circuit 10, and then controls institute
State the second inverter circuit 10 and export satisfactory three-phase alternating current to the second motor 11.Further, those skilled in the art
Can be under the teaching of the present embodiment, more inverter circuits in parallel on Absorption Capacitance 72, and then pass through a set of power conversion
Circuit exports three-phase alternating current to more motors, and here is omitted.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
Within the spirit and principle of utility model, any modification, equivalent substitution and improvements done etc. should be included in the utility model
Within the scope of protection.
Claims (10)
1. a kind of power conversion circuit, the power conversion circuit includes rectification module (1), inductor (2), capacitor (3), the
One inverter circuit (4) and control module (5), the inductor (2) are connected with AC power (9), the capacitor (3) and institute
State rectification module (1) series connection, first inverter circuit (4) is arranged in parallel on capacitor (3), the control module (5) with
First inverter circuit (4) connection, for controlling the first inverter circuit (4) output three-phase alternating current, described first is inverse
Become circuit (4) be connected with the first motor (6), the three-phase alternating current that first inverter circuit (4) exports is for driving described the
One motor (6) is run, it is characterised in that absorbing circuit (7) is connected with stabilizing inducatnce (8), the entirety after series connection and capacitor (3)
It is in parallel.
2. power conversion circuit according to claim 1, it is characterised in that the absorbing circuit (7) only includes first and inhaled
Receive resistance (71).
3. power conversion circuit according to claim 1, it is characterised in that the absorbing circuit (7) is the first absorption electricity
Hinder (71) and the cascaded structure of Absorption Capacitance (72).
4. power conversion circuit according to claim 1, it is characterised in that the absorbing circuit (7) is the first absorption electricity
Hinder (71) and the parallel-connection structure of Absorption Capacitance (72).
5. power conversion circuit according to claim 1, it is characterised in that the first absorption resistance (71) and Absorption Capacitance
(72) it is in parallel, doublet is formed, the doublet is connected with the second absorption resistance (73) again, form the absorbing circuit (7).
6. power conversion circuit according to claim 5, it is characterised in that also connect two on the second absorption resistance (73)
Pole pipe (74), the diode (74) be arranged such that the electric current of the output from the rectification module (1) by and flow into absorption electricity
Road (7).
7. power conversion circuit according to claim 6, it is characterised in that the control module (5) includes control device
(51), DC/DC modules (52), PWM generator (53), the DC/DC modules (52) are connected with control device (51), for institute
State control device (51) and low-voltage DC is provided, the control device (51) is connected with the first PWM generator (53), for controlling
The PWM generator (53) generates satisfactory PWM waveform, first PWM generator (53) and the first inverter circuit (4)
Connection, for inputting PWM waveform to first inverter circuit (4).
8. power conversion circuit according to claim 7, it is characterised in that the Absorption Capacitance (72) is electrochemical capacitor,
The charging voltage of the Absorption Capacitance (72) is smoothed as substantially constant, and the DC/DC modules (52) are connected in parallel on Absorption Capacitance
(72) on.
9. power conversion circuit according to claim 8, it is characterised in that one or more inverter circuits are connected in parallel on described
On Absorption Capacitance (72).
10. power conversion circuit according to claim 9, it is characterised in that the control device (51) passes through respective counts
The PWM generator of amount controls one or more of inverter circuit generation three-phase alternating currents.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720130407.5U CN206517305U (en) | 2017-02-14 | 2017-02-14 | A kind of power conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720130407.5U CN206517305U (en) | 2017-02-14 | 2017-02-14 | A kind of power conversion circuit |
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| Publication Number | Publication Date |
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| CN206517305U true CN206517305U (en) | 2017-09-22 |
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| CN201720130407.5U Active CN206517305U (en) | 2017-02-14 | 2017-02-14 | A kind of power conversion circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109599888A (en) * | 2017-09-25 | 2019-04-09 | 奥的斯电梯公司 | The mixed DC chain-circuit system of regenerative drive |
-
2017
- 2017-02-14 CN CN201720130407.5U patent/CN206517305U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109599888A (en) * | 2017-09-25 | 2019-04-09 | 奥的斯电梯公司 | The mixed DC chain-circuit system of regenerative drive |
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