CN207518501U - Dc bus low capacity capacitance frequency conversion control circuit and frequency conversion equipment - Google Patents
Dc bus low capacity capacitance frequency conversion control circuit and frequency conversion equipment Download PDFInfo
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- CN207518501U CN207518501U CN201721680256.7U CN201721680256U CN207518501U CN 207518501 U CN207518501 U CN 207518501U CN 201721680256 U CN201721680256 U CN 201721680256U CN 207518501 U CN207518501 U CN 207518501U
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Abstract
The utility model discloses a kind of dc bus low capacity capacitance frequency conversion control circuit and frequency conversion equipment, including rectifier, dc bus, low capacity capacitance, inverter, Inverter control module, power switch, Inverter control module power supply circuit and power control module；Power switch is connected between rectifier and exchange input；The connection exchange input of Inverter control module power supply circuit, power supply is provided for Inverter control module；Power control module control power switch after Inverter control module power supply circuit is stable is closed so that exchange input connection rectifier.Start Inverter control module power supply circuit first after complete machine powering offer exchange input and provide working power for Inverter control module, power control module controls power switch to be closed so that exchange input connection rectifier again after its stabilization, make inverter control circuit and inverter performance loop time-sharing power in a manner of 2 grades of upper electric control, improve the reliability of frequency control.
Description
Technical field
The utility model belongs to motor control technology field, specifically, being to be related to a kind of dc bus low capacity capacitance
Frequency conversion control circuit and frequency conversion equipment.
Background technology
There are two class product of constant speed air-conditioning and convertible frequency air-conditioner, constant speed air-conditionings to generate huge impact on startup for air-conditioning market
Electric current influences the operation of other electric appliances in power grid, and a large amount of harmonic waves can be generated in operational process, increases network load and influences power grid
Safety, but because constant speed air-conditioning is at low cost, therefore occupies the air conditioner market of large scale.
The DC filtering link of the frequency control of traditional convertible frequency air-conditioner is by thousands of microfarads even electrolysis of thousands of microfarads
Capacitance forms, but the capacity conference of electrolytic capacitor, is distorted in mains input side electric current and causes harmonic components high, and power
Factor the, harmonic wave caused by order to improve filter capacitor charge and discharge, and need to increase PFC（Power Factor
Correction, power factor correction）Circuit carries out power factor correction and solves harmonic problem；And opening in pfc circuit
Very big power loss and very big EMI can be generated under higher switching frequency by closing device（Electro Magnetic
Interference, electromagnetic interference）Interference does not solve the problem EMI in need that increases and filters cost, therefore, traditional frequency conversion
Control circuit high expensive, and the vulnerable device of electrolytic capacitor and the power device in PFC circuits for frequency-variable controller, wherein especially
It is that electrochemical capacitor life is influenced to become apparent from by temperature and voltage.
It is proposed in view of the above problems, having in the prior art with the scheme of the thin-film capacitor substitution electrolytic capacitor of low-capacitance, energy
PFC parts and EMI filtering parts are enough saved, realizes miniaturization and the low cost of frequency conversion control circuit, can also eliminate electrolysis electricity
The problem of holding short life, but the capacity of the usually thin-film capacitor of low-capacitance is small, causes DC bus-bar voltage unstable, works as system impedance
When matching improper, system resonance is caused, the over-voltage fault of system occurs, to overcome the problems, such as these, existing solution is logical
The detection to parameters such as AC-input voltage, busbar voltages is crossed, is asked with driving algorithm to solve DC bus-bar voltage stability
Topic.
Invention content
This application provides a kind of dc bus low capacity capacitance frequency conversion control circuit and frequency conversion equipments, build a kind of utilization
The frequency conversion control circuit of low-capacitance thin-film capacitor to realize the stability Design to DC bus-bar voltage, and is capable of providing solution
The parameters of harmonic problem and the driving algorithm of DC bus-bar voltage stability.
To realize above-mentioned technique effect, the application is achieved using following technical scheme：
A kind of dc bus low capacity capacitance frequency conversion control circuit is proposed, including rectifier, dc bus, low capacity electricity
Appearance, inverter and Inverter control module；Two output terminals of the rectifier connect the dc bus, the low capacity capacitance
It is in parallel with the dc bus successively with the inverter；Further include power switch, Inverter control module power supply circuit and confession
Electric control module；The power switch is connected between the rectifier and exchange input；The Inverter control module power supply
The circuit connection exchange input, power supply is provided for the Inverter control module；The power control module, for described
After Inverter control module power supply circuit is stable, the power switch is controlled to be closed, so that the exchange input connection
The rectifier.
A kind of frequency conversion equipment is proposed, including dc bus low capacity capacitance frequency conversion control circuit, the dc bus little Rong
It measures capacitance frequency conversion control circuit and includes rectifier, dc bus, low capacity capacitance, inverter and Inverter control module；It is described
Two output terminals of rectifier connect the dc bus, the low capacity capacitance and the inverter successively with the dc bus
It is in parallel；Further include power switch, Inverter control module power supply circuit and power control module；The power switch is connected to institute
It states between rectifier and exchange input；The Inverter control module power supply circuit connection exchange input, is the inversion
Device control module provides power supply；The power control module, for stable in the Inverter control module power supply circuit
Afterwards, the power switch is controlled to be closed, so that the exchange input connects the rectifier.
Compared with prior art, the advantages of the application and good effect is：The dc bus low capacity electricity that the application proposes
Hold frequency conversion control circuit include rectifier, dc bus, low capacity capacitance, inverter, Inverter control module, power switch,
Inverter control module power supply circuit and power control module；Inverter control module power supply circuit is directly connected to exchange input,
Power switch is connected between exchange input and rectifier, power switch disconnects so that exchange input is separated with rectifier, whole
Machine powers on to be started Inverter control module power supply circuit after offer exchange input for Inverter control module to provide work electric first
Source, after its stabilization, power control module controls power switch to be closed so that exchanging input connection rectifier again, then rectifier
DC power supply is exported again to inverter, is realized inverter busbar power supply electrifying, is made inversion by way of this 2 grades upper electric control
Device control loop and inverter performance loop time-sharing power improve the reliability of frequency control.Increase surge voltage to absorb back
Road, can be by the surge voltage absorption circuit by surge energy when in second level circuit, moment surge over voltage occurs in busbar voltage
In bleed off to the bus capacitor in first order circuit, the excessive pressure damages of second level power device are avoided, reliability is improved, realizes to straight
Flow the stability Design of busbar voltage.
After the detailed description of the application embodiment is read in conjunction with the figure, other features and advantages of the application will become more
Add clear.
Description of the drawings
Fig. 1 is the circuit embodiments figure for the dc bus low capacity capacitance frequency conversion control circuit that the application proposes；
Fig. 2 is the implementation illustration for the dc bus overvoltage crowbar that the application proposes；
Fig. 3 is the implementation illustration for the AC-input voltage detection circuit that the application proposes.
Specific embodiment
The specific embodiment of the application is described in more detail below in conjunction with the accompanying drawings.
As shown in Figure 1, the dc bus low capacity capacitance frequency conversion control circuit that the application proposes, including rectifier U1, directly
Flow busbar, low capacity capacitance C1, inverter U, Inverter control module U2, power switch K1, Inverter control module power supply electricity
Road U3 and power control module U4；The two output terminal b1 of rectifier U1 connect dc bus, low capacity capacitance C1 and inversion with b2
Device U is in parallel with dc bus successively；Power switch K1 is connected between rectifier U1 and exchange input AC；Inverter control module
Power supply circuit U3 connections exchange input AC, working power is provided for Inverter control module U2；Power control module U4 is used for
After Inverter control module power supply circuit U3 is stable, control power switch K1 is closed, so that exchange input AC connections are whole
Flow device U1；Inverter U connection motors COMP.
Inverter control module power supply circuit U3 is directly connected to exchange input AC, connects between exchange input AC and rectifier U1
Power switch K1 is connected to, power switch K1 is disconnected so that exchange input AC and rectifier U1 is separated, in complete machine powering offer exchange
It can start Inverter control module power supply circuit U3 first after input AC and provide working power for Inverter control module U2, at it
After stabilization, power switch K1 is controlled to be closed again by power control module U4 so that exchange input AC connection rectifier U1, then rectification
Device U1 exports DC power supply to inverter U again, inverter busbar power supply electrifying is realized, by way of this 2 grades upper electric control
Make inverter control circuit and inverter performance loop time-sharing power, improve the reliability of frequency control, realize to direct current mother
The stability Design of line voltage.
Specifically, as shown in Figure 1, the application propose Inverter control module power supply circuit U3 include first resistor R1,
First diode D1, electrolytic capacitor E1, switching tube IC1 and transformer T；The connection of first resistor R1 one end, which exchanges, inputs AC, and first
The other end of resistance R1 connects the anode of the first diode D1, the primary coil of the cathode connection transformer T of the first diode D1
One end, the second input terminal b of the primary coil other end connecting valve pipe IC1 of transformer T, the output terminal c of switching tube IC1 connect
Ground；The first input end a of switching tube IC1 is connected to the positive terminal of electrolytic capacitor E1 through resistance；Electrolytic capacitor E1 positive terminals connect
The cathode of first diode D1, the negative pole end ground connection of electrolytic capacitor E1.
After complete machine powering, exchange input AC is straight by the first diode D1 halfwave rectifier output ripples after first resistor R1
Stream, pulsating direct current output makes electrolytic capacitor E1 charge, and when electrolytic capacitor E1 voltages reach setting value, switching tube IC1 is carried out
Switch control is that Inverter control module U2 and/or power control module U4 powers.
After Inverter control module power supply circuit U3 the operation is stable namely after output steady operation power supply, confession is automatically controlled
Molding block U4 controls power switch K1 to be closed again, and among these, the output stability of Inverter control module power supply circuit U3 can be with
It is measured by time setting or sampled data, for example, power control module U4 can meet Inverter control module power supply electricity
Control is closed power switch K1 after the period of road U3 steady operations, alternatively, passing through the defeated of Inverter control module power supply circuit
Go out voltage signal to be sampled to determine whether meet predeterminated voltage, power switch K1 etc. is closed after predeterminated voltage is met.
The dc bus low capacity capacitance frequency conversion control circuit that the application proposes further includes the absorption of dc bus surge voltage
Circuit U5；As shown in Figure 1, the dc bus surge voltage absorption circuit U5 include the second diode D2, second resistance R2 and
Electrolytic capacitor E1；The first DC output end b1's, the second diode D21 of the anode connection rectifier U1 of second diode D2 is negative
Pole connects second resistance R2, and the other end of second resistance R2 connects the first diode D1 cathode and the anode of electrolytic capacitor E1.By
In the low-capacitance capacitance on dc bus be only the thin-film capacitor of tens microfarads, inverter side feed back moment surge voltage when,
Busbar voltage Vdc1 moments can be caused to increase, inverter end may be caused to damage, therefore, the dc bus surge electricity in the application
Absorption circuit U5 is pressed, in Vdc1>During Vdc2, DC bus-bar voltage is by the second diode D2 and second resistance R2 to electrolytic capacitor
E1 charges, and reduces the voltage value of Vdc1, safeguards that DC bus-bar voltage is stablized.
Dc bus low capacity capacitance frequency conversion control circuit in the application further includes dc bus overvoltage crowbar；Such as
Shown in Fig. 2, including reference voltage circuit and first comparator U7；Resistor voltage divider circuit in reference voltage circuit such as figure, ginseng
Examine the first input end of the output connection first comparator U7 of potential circuit（Positive terminal in diagram）, the of first comparator U7
Two input terminals（Reverse side in diagram）Be connected on dc bus or the positive terminal of electrolytic capacitor or as depicted with electricity
The output terminal of resistor voltage divider circuit of solution capacitance E1 parallel connections etc. is any to be reflected in the test point of DC bus-bar voltage；First ratio
Output terminal connection Inverter control module U2 compared with device U7；It is higher than the output voltage of reference voltage circuit in DC bus-bar voltage
When, Inverter control module U2 is controlled according to the output of first comparator stops inverter output, realizes to the quick of inverter
Protection.
The dc bus low capacity capacitance frequency conversion control circuit that the application proposes also solves harmonic problem and direct current to provide
The driving algorithm of busbar voltage stability provides parameters, specifically, busbar voltage detection circuit U 8 for example shown in Fig. 2；
The busbar voltage detection circuit connects dc bus, for obtaining and exporting the voltage on dc bus；Specific busbar electricity
Press detection circuit resistor voltage divider circuit for example as depicted output or other can realize sampling busbar voltage circuit, this
Application not limits, and the output Vdc1-AD/Vdc2-AD of busbar voltage detection circuit is exported is used for software to MCU or drive module
Protection control.
As shown in figure 3, the dc bus low capacity capacitance frequency conversion control circuit that the application proposes further includes exchange input electricity
Press detection circuit；Including resistance network circuit U10, Bias voltage-setting circuit U11 and the second comparator U12；Resistor network electricity
The input terminal connection exchange input AC of road U10, the first of the second comparator of the first output terminal connection of resistance network circuit are defeated
Enter end（The positive terminal of diagram）；The second output terminal of resistor network connects the second input terminal of the second comparator（The reverse phase of diagram
End）；The first input end of output the second comparator of connection of Bias voltage-setting circuit U11, using alternating-current bidirectional detection mode,
Detection signal is applied into a bias voltage, the voltage signal that output signal is made to be 0-5V passes through the circuit, MCU, drive module
Etc. control modules can detect the variation of input voltage in real time be driven control, among these, Vac-AD for exchange input electricity
The analog quantity detection output signal of pressure.
Based on above-mentioned dc bus low capacity capacitance frequency conversion control circuit, the application also protects a kind of such as convertible frequency air-conditioner
Deng frequency conversion equipment, using there is a dc bus low capacity capacitance frequency conversion control circuit as described above, Inverter control module supplies
Circuit is directly connected to exchange input, and power switch is connected between exchange input and rectifier, and power switch is disconnected so that handing over
Stream input is separated with rectifier, and it is inverse to start Inverter control module power supply circuit first after complete machine powering provides exchange input
Become device control module and working power is provided, after its stabilization, power switch is controlled to be closed again for power control module so that exchange is defeated
Enter and connect rectifier, then rectifier exports DC power supply to inverter again, inverter busbar power supply electrifying is realized, by this
The modes of 2 grades of upper electric control make inverter control circuit and inverter performance loop time-sharing power, and improve frequency control can
By property.Increase surge voltage absorption circuit, when moment surge over voltage occurs in busbar voltage in second level circuit, the surge can be passed through
The crushing excessively that voltage absorption circuit in the bus capacitor of surge energy bleed off to first order circuit, will avoid second level power device
It is bad, reliability is improved, realizes the stability Design to DC bus-bar voltage.It is also, also female to solve harmonic problem and direct current
The driving algorithm of line voltage stability problem provides the parameters such as input voltage, DC bus-bar voltage.
It should be noted that the above description is not intended to limit the present invention, the utility model is also not limited to
The example above, variation that those skilled in the art are made in the essential scope of the utility model retrofit, add
Add or replace, should also belong to the protection scope of the utility model.
Claims (7)
1. dc bus low capacity capacitance frequency conversion control circuit, including rectifier, dc bus, low capacity capacitance, inverter and
Inverter control module；Two output terminals of the rectifier connect the dc bus, the low capacity capacitance and the inversion
Device is in parallel with the dc bus successively；It is characterized in that, further include power switch, Inverter control module power supply circuit and confession
Electric control module；
The power switch is connected between the rectifier and exchange input；
The Inverter control module power supply circuit connection exchange input, power supply is provided for the Inverter control module；
The power control module, for after the Inverter control module power supply circuit is stable, controlling the power supply
Switch is closed, so that the exchange input connects the rectifier.
2. dc bus low capacity capacitance frequency conversion control circuit according to claim 1, which is characterized in that the inverter
Control module power supply circuit includes first resistor, the first diode, electrolytic capacitor, switching tube and transformer；
First resistor one end connection exchange input, the other end of the first resistor connect first diode
Anode, the cathode of first diode connect primary coil one end of the transformer, and the primary coil of the transformer is another
One end connects the second input terminal of the switching tube, the output terminal ground connection of the switching tube, the first input end of the switching tube
Connect the positive terminal of the electrolytic capacitor；The electrolytic capacitor positive terminal connects the cathode of first diode, the electrolysis
The negative pole end ground connection of capacitance.
3. dc bus low capacity capacitance frequency conversion control circuit according to claim 2, which is characterized in that the direct current is female
Line low capacity capacitance frequency conversion control circuit further includes dc bus surge voltage absorption circuit；
The dc bus surge voltage absorption circuit includes the second diode, second resistance and the electrolytic capacitor；
The anode of second diode connects the first DC output end of the rectifier, and the cathode of second diode connects
The second resistance is connect, the other end of the second resistance connects the cathode of first diode.
4. dc bus low capacity capacitance frequency conversion control circuit according to claim 3, which is characterized in that the direct current is female
Line low capacity capacitance frequency conversion control circuit further includes dc bus overvoltage crowbar；
The dc bus overvoltage crowbar includes reference voltage circuit and first comparator；
The first input end of the output connection first comparator of the reference voltage circuit, the second of the first comparator
Input terminal is connected on the dc bus or the positive terminal of the electrolytic capacitor；The output terminal connection institute of the first comparator
State Inverter control module；When the DC bus-bar voltage is higher than the output voltage of the reference voltage circuit, the inversion
Device control module stops the inverter according to the output of first comparator control and exports.
5. dc bus low capacity capacitance frequency conversion control circuit according to claim 1, which is characterized in that the direct current is female
Line low capacity capacitance frequency conversion control circuit further includes busbar voltage detection circuit；
The busbar voltage detection circuit connects the dc bus, for obtaining and exporting the voltage on the dc bus.
6. dc bus low capacity capacitance frequency conversion control circuit according to claim 1, which is characterized in that the direct current is female
Line low capacity capacitance frequency conversion control circuit further includes AC-input voltage detection circuit；
The AC-input voltage detection circuit includes resistance network circuit, Bias voltage-setting circuit and the second comparator；
The input terminal connection exchange input of the resistance network circuit, the first output terminal connection of the resistance network circuit
The first input end of second comparator；The second output terminal of the resistor network connects the second of second comparator
Input terminal；
The output of the Bias voltage-setting circuit connects the first input end of second comparator.
7. frequency conversion equipment, which is characterized in that including such as claim 1-6 any one of them dc bus low capacity capacitance frequency conversion
Control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721680256.7U CN207518501U (en) | 2017-12-06 | 2017-12-06 | Dc bus low capacity capacitance frequency conversion control circuit and frequency conversion equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721680256.7U CN207518501U (en) | 2017-12-06 | 2017-12-06 | Dc bus low capacity capacitance frequency conversion control circuit and frequency conversion equipment |
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| CN207518501U true CN207518501U (en) | 2018-06-19 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107959458A (en) * | 2017-12-06 | 2018-04-24 | 海信（山东）空调有限公司 | Dc bus low capacity capacitance frequency conversion control circuit and frequency conversion equipment |
| CN110417250A (en) * | 2019-08-05 | 2019-11-05 | 深圳市搏世通用科技开发有限公司 | A kind of adaptive power supply soft-start control system |
-
2017
- 2017-12-06 CN CN201721680256.7U patent/CN207518501U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107959458A (en) * | 2017-12-06 | 2018-04-24 | 海信（山东）空调有限公司 | Dc bus low capacity capacitance frequency conversion control circuit and frequency conversion equipment |
| CN110417250A (en) * | 2019-08-05 | 2019-11-05 | 深圳市搏世通用科技开发有限公司 | A kind of adaptive power supply soft-start control system |
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