CN209692665U - A kind of frequency-variable controller driving circuit - Google Patents
A kind of frequency-variable controller driving circuit Download PDFInfo
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- CN209692665U CN209692665U CN201920948772.6U CN201920948772U CN209692665U CN 209692665 U CN209692665 U CN 209692665U CN 201920948772 U CN201920948772 U CN 201920948772U CN 209692665 U CN209692665 U CN 209692665U
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Abstract
The utility model relates to low-voltage electrical control technology fields, provide a kind of frequency-variable controller driving circuit, including rectification circuit, capacitance voltage stabilizing circuit, inverter circuit, voltage sampling circuit, current sampling circuit and controller；Voltage sampling circuit acquires the voltage of rectification circuit exchange input side；Capacitance voltage stabilizing circuit includes thin-film capacitor；Current sampling circuit acquires the electric current of rectification circuit DC output side output in real time；Controller obtains the voltage value of voltage sampling circuit sampling and the current value of current sampling circuit sampling in real time, to calculate the realtime power that rectification circuit is exported to inverter circuit, and controls the voltage output of inverter circuit；The utility model is for the frequency-variable controller driving circuit of traditional cross-straight-intersection transmission mode, realize the dynamic regulation to transmission power, improve the transfer efficiency of electric energy, it is ensured that the reliability of drive circuit works, and be widely used in working under different power grid environments.
Description
Technical field
The utility model relates to low-voltage electrical control technology field more particularly to a kind of frequency-variable controller driving circuits.
Background technique
Currently, traditional refrigerator, refrigerator are generallyd use with frequency-variable controller by filter circuit, rectifier bridge, capacitance voltage stabilizing electricity
The driving circuit that road and inverter circuit are constituted, wherein inverter circuit is the three-phase using six device for power switching IGBT composition
Bridge inverter main circuit.As shown in Figure 1, the driving circuit at work, by rectifier bridge BD1 by AC rectification in " steamed bun wave "
Electricity carries out pressure stabilizing and energy storage using the capacitance voltage stabilizing circuit comprising big capacity electrolyte capacitor EC1, and is filtered into containing minimum ripple
Direct current, then, then by inverter circuit (IGBTs) copped wave formed need frequency and the adjustable alternating current of voltage, with drive
Dynamic frequency-changeable compressor.
Traditional transducer drive circuit is when carrying out power transmission as a result, using cross-straight-intersection transmission mode, i.e., first
AC rectification is filtered into direct current, energy storage is in the capacitance voltage stabilizing circuit being made of electrolytic capacitor, then extracts electrolysis
The energy of capacitor is converted into the power of demand by device for power switching IGBT according to certain timing switching.However, this change
At work, there are the following problems for frequency device driving circuit:
(1) traditional transducer drive circuit places one's entire reliance upon storage and release of the electrolytic capacitor EC1 to energy, but is electrolysed
Capacitor EC1 includes electrolyte, high temperature or after working long hours, and electrolyte inside can evaporate reduction, so that capacity reduces, finally lead
Cause a whole set of driving circuit that cannot steadily work for a long time；
(2) transducer drive circuit in, the maximum nominal voltage of electrolytic capacitor is usually no more than 500-600V, if
Using under higher voltage conditions, it is necessary to it is used in series using more electrolytic capacitors, this increases accordingly equipment cost, and
Due to the ESR(equivalent series resistance of every capacitor) it is different, when series connection, must pressure be handled；In addition, be limited by electrolytic capacitor without
Method bears backward voltage, if having more than 1.5 times of backward voltages and be applied to capacitor both ends, the chemistry inside capacitor can be caused anti-
It answers, or even explodes；Electrolytic capacitor receiving surge voltage ability is weak simultaneously, and maximum can bear 1.15 or 2 times of surge voltage,
Otherwise, failure is caused punch through.
From the foregoing, it will be observed that the transducer drive circuit that conventionally employed electrolytic capacitor carries out the conversion of " cross-straight-intersection " electric energy exist at
This height, cannot ensure to be stablized for a long time, reliably working the problem of.
Summary of the invention
(1) technical problems to be solved
The purpose of the utility model is to provide a kind of frequency-variable controller driving circuits, to solve conventionally employed electrolytic capacitor
The transducer drive circuit of " cross-straight-intersection " electric energy conversion is carried out there are at high cost, cannot ensure to be stablized for a long time, reliable work
The problem of making.
(2) technical solution
In order to solve the above-mentioned technical problem, the utility model provides a kind of frequency-variable controller driving circuit, including successively
Rectification circuit, capacitance voltage stabilizing circuit and the inverter circuit of connection, further include voltage sampling circuit, current sampling circuit and control
Device；
The voltage sampling circuit acquires the voltage of the rectification circuit exchange input side in real time；
The capacitance voltage stabilizing circuit includes thin-film capacitor, the DC output side of the rectification circuit and the inverter circuit
Direct current input side is connected, and the in parallel thin-film capacitor, the DC output side of the rectification circuit and the thin-film capacitor it
Between be in series with current sampling resistor；
The current sampling circuit acquires the electric current by the current sampling resistor in real time；
The controller obtains voltage value and the current sampling circuit sampling of the voltage sampling circuit sampling in real time
Current value, to calculate the realtime power that the rectification circuit is exported to the inverter circuit, and control the inverter circuit
Voltage output.
Preferably, rectification circuit described in the utility model is that single-phase bridge can not control rectifying circuit；The inverter circuit
For three-phase inverter bridge circuit, three-phase inverter bridge circuit includes three bridge arms, and there are two IGBT power switch for each bridge arm tool
Pipe；The controller is PLC controller, and the input terminal of the PLC controller is separately connected the voltage sampling circuit, the electricity
Sample circuit is flowed, the output end of the PLC controller is separately connected each IGBT power switch tube in the inverter circuit.
Preferably, the negative pole end ground connection of the DC output side of rectification circuit described in the utility model；The current sample
Resistance is connected between the negative pole end of the DC output side of the rectification circuit and the thin-film capacitor.
Preferably, voltage sampling circuit described in the utility model and the current sampling circuit are all made of difference and turn single-ended
Operational amplifier circuit.
Preferably, current sampling circuit described in the utility model includes the first operational amplifier；First operation is put
The in-phase end and reverse side of big device are correspondingly connected with the both ends of the current sampling resistor；The in-phase end of first operational amplifier
It is separately connected one end of resistance R6 and one end of resistance R7, another termination high level of resistance R6, the other end ground connection of resistance R7；
Series resistance R3 between the reverse side and its output end of first operational amplifier；The output end of first operational amplifier
As the sampled output of the current sampling circuit, the sampled output of the current sampling circuit is grounded by capacitor C2.
Preferably, the in-phase end of the first operational amplifier described in the utility model is to one end of the current sampling resistor
Between be sequentially connected in series resistance R5 and resistance R4；The reverse side of first operational amplifier is to the another of the current sampling resistor
Resistance R2 and resistance R1 are sequentially connected in series between end；Resistance R2, the interconnecting piece of resistance R1 and resistance R5, resistance R4 interconnecting piece between
Series capacitance C1.
Preferably, voltage sampling circuit described in the utility model includes second operational amplifier；Second operation is put
The in-phase end of big device is correspondingly connected with the rectification circuit with reverse side and exchanges input side；The in-phase end of the second operational amplifier
It is separately connected one end of resistance R15 and one end of resistance R8, another termination high level of resistance R15, another termination of resistance R8
Ground；Series resistance R16 between the reverse side of the second operational amplifier and its output end；The second operational amplifier it is defeated
The sampled output of sampled output of the outlet as the voltage sampling circuit, the voltage sampling circuit passes through capacitor C15
Ground connection.
Preferably, the in-phase end of second operational amplifier described in the utility model to the rectification circuit one of them
Resistance R14 and resistance R13 have been sequentially connected in series between ac input end；The reverse side of the second operational amplifier is to the rectification
Resistance R12 and resistance R11 have been sequentially connected in series between another ac input end of circuit；The interconnecting piece of resistance R14 and resistance R13
It is grounded by capacitor C12, the interconnecting piece of resistance R12 and resistance R11 are grounded by capacitor C11；The second operational amplifier
Capacitor C14 and forward diode D1 and backward dioded D2 are also parallel between in-phase end and backward end.
(3) technical effect
Frequency-variable controller driving circuit provided by the utility model, by using being adapted to larger power network fluctuation and severe work
The thin-film capacitor for making environment replaces traditional capacitance voltage stabilizing circuit being made of electrolytic capacitor, and passes through voltage sampling circuit, electricity
Sample circuit is flowed, the circuit of voltage and DC output side to rectification circuit exchange input side carries out real-time monitoring, calculates with this
It being delivered to the power of inverter circuit direct current input side in real time, thus, when output power reaches wave crest, can be controlled by controller
Inverter circuit fast and dense ground output power, is run with driving motor, and when output power is in trough, utilize turning for motor
Dynamic inertia buffer power transmission.
It can be seen that the utility model relative to traditional cross-straight-intersection transmission mode frequency-variable controller driving circuit and
Speech, realizes the dynamic regulation to transmission power, improves the transfer efficiency of electric energy, it is ensured that the stabilization of drive circuit works can
It leans on, and is widely used in working under different power grid environments.
Detailed description of the invention
It, below will be to implementation in order to illustrate more clearly of the embodiments of the present invention or technical solution in the prior art
Example or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, the accompanying drawings in the following description is
Some embodiments of the utility model, for those of ordinary skill in the art, without creative efforts,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is the structural schematic diagram of existing frequency-variable controller driving circuit；
Fig. 2 is the control structure block diagram of frequency-variable controller driving circuit shown in the utility model embodiment；
Fig. 3 is rectification circuit, capacitance voltage stabilizing circuit in frequency-variable controller driving circuit shown in the utility model embodiment
The circuit original image being connected with inverter circuit；
Fig. 4 is the circuit original image of current sampling circuit shown in the utility model embodiment；
Fig. 5 is that the sampling input terminal of current sampling circuit and sampled output are bent in the voltage change of a cycle in Fig. 4
Line chart；
Fig. 6 is the circuit original image of voltage sampling circuit shown in the utility model embodiment；
Fig. 7 is that the sampling input terminal of voltage sampling circuit and sampled output are bent in the voltage change of a cycle in Fig. 6
Line chart.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model
Example, every other embodiment obtained by those of ordinary skill in the art without making creative efforts belong to
The range of the utility model protection.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " is pacified
Dress ", " connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
The concrete meaning of language in the present invention.
Present embodiments provide a kind of frequency-variable controller driving circuit, including sequentially connected rectification circuit, capacitance voltage stabilizing
Circuit and inverter circuit, further include voltage sampling circuit, current sampling circuit and controller, referring to fig. 2；
As shown in Figure 3, voltage sampling circuit acquires the voltage of rectification circuit BD1 exchange input side in real time；Capacitance voltage stabilizing electricity
Road includes thin-film capacitor CFilm, the DC output side of rectification circuit BD1 is connected with the direct current input side of inverter circuit IGBTs, and
Parallel thin film capacitor CFilm, the DC output side and thin-film capacitor C of rectification circuit BD1FilmBetween be in series with current sampling resistor R_
Sense；Current sampling circuit acquires the electric current by current sampling resistor R_Sense in real time；Controller obtains voltage in real time and adopts
The current value of voltage value and the current sampling circuit sampling of sample circuit sampling, to calculate rectification circuit BD1 to the inverter circuit
The realtime power of output, and control the voltage output of inverter circuit IGBTs.
The structure as shown in Fig. 2-3 it is found that the present embodiment by using being adapted to larger power network fluctuation and harsh ring
The thin-film capacitor in border replaces traditional capacitance voltage stabilizing circuit being made of electrolytic capacitor, and is adopted by voltage sampling circuit, electric current
The circuit of sample circuit, voltage and DC output side to rectification circuit exchange input side carries out real-time monitoring, is calculated in real time with this
It is delivered to the power of inverter circuit direct current input side, thus, when output power reaches wave crest, inversion can be controlled by controller
Circuit fast and dense ground output power utilizes electricity with driving motor Compressor operation, and when output power is in trough
The rotator inertia of machine Compressor slows down power transmission, realizes the dynamic regulation to transmission power with this, improves driving
Transfer efficiency of the circuit to electric energy.
Further, referring to Fig. 3, rectification circuit BD1 is that single-phase bridge can not control rectifying circuit in the present embodiment；Inversion electricity
Road IGBTs is three-phase inverter bridge circuit, and three-phase inverter bridge circuit includes three bridge arms, and there are two IGBT function for each bridge arm tool
Rate switching tube；The PLC controller of the model S7-200 of Siemens Company's production, the simulation of PLC controller can be used in controller
Amount input terminal is separately connected voltage sampling circuit, current sampling circuit, and the analog output end of PLC controller is separately connected inversion
Each IGBT power switch tube in circuit I GBTs.
Further, referring to Fig. 3, the negative pole end ground connection of the DC output side of rectification circuit BD1 in the present embodiment；Electric current is adopted
Sample resistance R_Sense is connected on the negative pole end and thin-film capacitor C of the DC output side of rectification circuit BD1FilmBetween.
Further, voltage sampling circuit described in the present embodiment and the current sampling circuit are all made of difference and turn single-ended
Operational amplifier circuit.
Further, referring to fig. 4, current sampling circuit described in the present embodiment includes the first operational amplifier U1；It is described
Sampling input terminal I_ac of the in-phase end and reverse side of first operational amplifier U1 as current sampling circuit, and it is correspondingly connected with institute
State the both ends of current sampling resistor R_Sense；The in-phase end of the first operational amplifier U1 is separately connected one end of resistance R6
With one end of resistance R7, another termination 5V high level of resistance R6, the other end ground connection of resistance R7, wherein resistance R6 and resistance
The interconnecting piece of R7 is 2.5V as signal midpoint, the level at the signal midpoint；The reverse side of the first operational amplifier U1 with
Series resistance R3 between its output end；Sampling of the output end of the first operational amplifier U1 as the current sampling circuit
The sampled output Iac_s of output end Iac_s, the current sampling circuit are grounded by capacitor C2.
Further, the in-phase end of the first operational amplifier U1 described in the present embodiment is to the current sampling resistor R_
Resistance R5 and resistance R4 are sequentially connected in series between one end of Sense；The reverse side of the first operational amplifier U1 is to the electric current
Resistance R2 and resistance R1 are sequentially connected in series between the other end of sampling resistor R_Sense；The interconnecting piece and resistance of resistance R2, resistance R1
R5, resistance R4 interconnecting piece between series capacitance C1.
By above-mentioned current sampling circuit, it can be measured and sample input terminal I_ac and sampled output Iac_s in a cycle
Interior voltage change curve, as shown in Figure 5.By the acquisition of the electric signal of the sampled output Iac_s to current sampling circuit,
And by the conversion of controller, the current value for passing through current sampling resistor R_Sense in real time can be obtained.
Further, referring to Fig. 6, voltage sampling circuit described in the present embodiment includes second operational amplifier U2；It is described
Sampling input terminal V_ac of the in-phase end and reverse side of second operational amplifier U2 as voltage sampling circuit, and it is correspondingly connected with institute
State the exchange input side of rectification circuit BD1；The in-phase end of the second operational amplifier U2 be separately connected resistance R15 one end and
One end of resistance R8, another termination 5V high level of resistance R15, the other end ground connection of resistance R8, wherein resistance R15 and resistance
The interconnecting piece of R8 is 2.5V as signal midpoint, the level at the signal midpoint；The reverse side of the second operational amplifier U2 with
Series resistance R16 between its output end；Output end the adopting as the voltage sampling circuit of the second operational amplifier U2
The sampled output Vac_s of sample output end Vac_s, the voltage sampling circuit are grounded by capacitor C15.
Further, the in-phase end of second operational amplifier U2 described in the present embodiment to the rectification circuit BD1 its
In be sequentially connected in series resistance R14 and resistance R13 between an ac input end；The reverse side of the second operational amplifier U2 arrives
Resistance R12 and resistance R11 have been sequentially connected in series between another ac input end of the rectification circuit BD1；Resistance R14 and resistance
The interconnecting piece of R13 is grounded by capacitor C12, and the interconnecting piece of resistance R12 and resistance R11 are grounded by capacitor C11；Second fortune
It calculates and is also parallel with capacitor C14 and forward diode D1 and backward dioded D2 between the in-phase end and backward end of amplifier U2.
By above-mentioned voltage sampling circuit, it can be measured and sample input terminal V_ac and sampled output Vac_s in a cycle
Interior voltage change curve, as shown in Figure 7.By the acquisition of the electric signal of the sampled output Vac_s to voltage sampling circuit,
And by the conversion of controller, the voltage value for being input to the exchange input side of rectification circuit BD1 in real time can be obtained.
Finally, it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations；
Although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that:
It is still possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is carried out etc.
With replacement；And these are modified or replaceed, various embodiments of the utility model technology that it does not separate the essence of the corresponding technical solution
The spirit and scope of scheme.
Claims (8)
1. a kind of frequency-variable controller driving circuit, including sequentially connected rectification circuit, capacitance voltage stabilizing circuit and inverter circuit,
It is characterized in that,
It further include voltage sampling circuit, current sampling circuit and controller；
The voltage sampling circuit acquires the voltage of the rectification circuit exchange input side in real time；
The capacitance voltage stabilizing circuit includes thin-film capacitor, the direct current of the DC output side of the rectification circuit and the inverter circuit
Input side is connected, and the thin-film capacitor in parallel, goes here and there between the DC output side of the rectification circuit and the thin-film capacitor
It is associated with current sampling resistor；
The current sampling circuit acquires the electric current by the current sampling resistor in real time；
The controller obtains the voltage value of the voltage sampling circuit sampling and the electricity of current sampling circuit sampling in real time
Flow valuve to calculate the realtime power that the rectification circuit is exported to the inverter circuit, and controls the voltage of the inverter circuit
Output.
2. a kind of frequency-variable controller driving circuit according to claim 1, which is characterized in that the rectification circuit is single-phase
Bridge-type can not control rectifying circuit；The inverter circuit is three-phase inverter bridge circuit, and three-phase inverter bridge circuit includes three bridges
Arm, there are two IGBT power switch tubes for each bridge arm tool；The controller is PLC controller, the input terminal of the PLC controller
It is separately connected the voltage sampling circuit, the current sampling circuit, the output end of the PLC controller is separately connected described inverse
Each IGBT power switch tube in power transformation road.
3. a kind of frequency-variable controller driving circuit according to claim 1 or 2, which is characterized in that the rectification circuit
The negative pole end of DC output side is grounded；The current sampling resistor is connected on the negative pole end of the DC output side of the rectification circuit
Between the thin-film capacitor.
4. a kind of frequency-variable controller driving circuit according to claim 3, which is characterized in that the voltage sampling circuit with
The current sampling circuit is all made of difference and turns single-ended operational amplifier circuit.
5. a kind of frequency-variable controller driving circuit according to claim 4, which is characterized in that the current sampling circuit packet
Include the first operational amplifier；The in-phase end and reverse side of first operational amplifier are correspondingly connected with the current sampling resistor
Both ends；The in-phase end of first operational amplifier is separately connected one end of resistance R6 and one end of resistance R7, and resistance R6's is another
One termination high level, the other end ground connection of resistance R7；It connects between the reverse side of first operational amplifier and its output end
Resistance R3；Sampled output of the output end of first operational amplifier as the current sampling circuit, the electric current are adopted
The sampled output of sample circuit is grounded by capacitor C2.
6. a kind of frequency-variable controller driving circuit according to claim 5, which is characterized in that first operational amplifier
In-phase end to being sequentially connected in series resistance R5 and resistance R4 between one end of the current sampling resistor；First operational amplifier
Reverse side be sequentially connected in series resistance R2 and resistance R1 between the other end of the current sampling resistor；Resistance R2, resistance R1
Interconnecting piece and resistance R5, resistance R4 interconnecting piece between series capacitance C1.
7. a kind of frequency-variable controller driving circuit according to claim 4, which is characterized in that the voltage sampling circuit packet
Include second operational amplifier；The in-phase end of the second operational amplifier is correspondingly connected with exchanging for the rectification circuit with reverse side
Input side；The in-phase end of the second operational amplifier is separately connected one end of resistance R15 and one end of resistance R8, resistance R15
Another termination high level, resistance R8 the other end ground connection；Between the reverse side of the second operational amplifier and its output end
Series resistance R16；Sampled output of the output end of the second operational amplifier as the voltage sampling circuit, the electricity
The sampled output of pressure sample circuit is grounded by capacitor C15.
8. a kind of frequency-variable controller driving circuit according to claim 7, which is characterized in that the second operational amplifier
In-phase end be sequentially connected in series resistance R14 and resistance R13 between one of ac input end of the rectification circuit；It is described
The reverse side of second operational amplifier to be sequentially connected in series between another ac input end of the rectification circuit resistance R12 and
Resistance R11；The interconnecting piece of resistance R14 and resistance R13 are grounded by capacitor C12, and the interconnecting piece of resistance R12 and resistance R11 pass through
Capacitor C11 ground connection；Capacitor C14 and forward diode are also parallel between the in-phase end and backward end of the second operational amplifier
D1 and backward dioded D2.
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| CN201920948772.6U CN209692665U (en) | 2019-06-24 | 2019-06-24 | A kind of frequency-variable controller driving circuit |
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| CN201920948772.6U CN209692665U (en) | 2019-06-24 | 2019-06-24 | A kind of frequency-variable controller driving circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110098780A (en) * | 2019-06-24 | 2019-08-06 | 黄石东贝电器股份有限公司 | A kind of frequency-variable controller driving circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110098780A (en) * | 2019-06-24 | 2019-08-06 | 黄石东贝电器股份有限公司 | A kind of frequency-variable controller driving circuit |
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| TR01 | Transfer of patent right |
Effective date of registration: 20210701 Address after: No.6, East Jinshan Avenue, Tieshan District, Huangshi economic and Technological Development Zone, Huangshi City, Hubei Province Patentee after: Huangshi Dongbei Compressor Co.,Ltd. Address before: No. 6, East Jinshan Avenue, Huangshi economic and Technological Development Zone, Huangshi City, Hubei Province Patentee before: Huangshi Dongbei Electrical Appliance Co.,Ltd. |
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