CN108768179A - Switching power circuit, driving plate and convertible frequency air-conditioner - Google Patents
Switching power circuit, driving plate and convertible frequency air-conditioner Download PDFInfo
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- CN108768179A CN108768179A CN201810809314.4A CN201810809314A CN108768179A CN 108768179 A CN108768179 A CN 108768179A CN 201810809314 A CN201810809314 A CN 201810809314A CN 108768179 A CN108768179 A CN 108768179A
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- circuit
- switch
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- switching power
- driving
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33561—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having more than one ouput with independent control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/16—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the circuit arrangement or by the kind of wiring
Abstract
This application involves a kind of switching power circuit, driving plate and convertible frequency air-conditioners, including transformer, control module and at least one drive module；The control module includes the first rectification module, and the drive module includes the second rectification module and division module；The transformer includes armature winding, the first secondary windings and second subprime winding corresponding with each drive module；The armature winding is connected with the power supply；First secondary windings forms the first current supply circuit with first rectification module；First current supply circuit is connected with the circuit to be controlled；The second subprime winding, second rectification module and the division module form the second current supply circuit, and second current supply circuit is connected with the driving switch in circuit to be driven.It using the technical solution of the application, can prevent driving plate from breaking down, reduce driving plate failure rate.
Description
Technical field
This application involves switch power technology fields, and in particular to a kind of switching power circuit, driving plate and convertible frequency air-conditioner.
Background technology
External convertible frequency air conditioner driven compressor plate generally comprise rectification circuit, inverter circuit, control circuit, driving circuit and
Switching power circuit.
In the prior art, the outlet side of switching power circuit exports 15V voltages all the way, gives control circuit, driving electricity respectively
All upper bridge driving switch in road and the power supply of lower bridge driving switch.And due to insulated gate bipolar transistor in inverter circuit
The negative pressure that (Insulated Gate Bipolar Transistor, IGBT) is generated in switching process is if it exceeds control electricity
The ability to bear on road can make the component damage in control circuit, driving plate is caused to break down, cause driving plate failure rate compared with
It is high.
Invention content
In view of this, the application's aims to overcome that the deficiencies in the prior art, a kind of switching power circuit, driving are provided
Plate and convertible frequency air-conditioner easily make the device failure in control circuit to solve existing switching power circuit, cause driving plate that event occurs
Barrier, leads to the higher problem of driving plate failure rate.
According to the embodiment of the present application in a first aspect, provide a kind of switching power circuit, including transformer, control module and
At least one drive module；
The control module includes the first rectification unit, and the drive module includes the second rectification unit and partial pressure unit；
The transformer includes armature winding, the first secondary windings and corresponding with each drive module second
Grade winding；
The armature winding is connected with the power supply；
First secondary windings forms the first current supply circuit with first rectification unit；First current supply circuit with
The circuit to be controlled is connected；
The second subprime winding, second rectification unit and the partial pressure unit form the second current supply circuit；It is described
Second current supply circuit is connected with the driving switch in circuit to be driven.
Further, in switching power circuit described above, the power supply drives for external convertible frequency air conditioner compressor
What the rectification circuit in movable plate obtained；
Accordingly, the armature winding is connected with the rectification circuit.
Further, switching power circuit described above further includes control switch；
The circuit that the control switch is formed with the primary windings connected in series is connected with the rectification circuit.
Further, in switching power circuit described above, the breakdown voltage for controlling switch is 900V-1000V.
Further, in switching power circuit described above, first rectification unit is the first diode；Described
Two rectification units are the second diode；The partial pressure unit includes voltage-stabiliser tube and resistance.
Further, switching power circuit described above further includes the first capacitance and the second capacitance；
The first end of first secondary windings is connected with the anode of first diode；The first of first capacitance
End is connected with the cathode of first diode, the second end phase of the second end of first capacitance and first secondary windings
Even；
The first end of the second subprime winding is connected with the anode of second diode；The first of second capacitance
End is connected with the cathode of second diode, the second end phase of the second end of second capacitance and the second subprime winding
Even.
Further, in switching power circuit described above, the drive module further includes third capacitance；
The third capacitance is in parallel with the voltage-stabiliser tube.
Further, in switching power circuit described above, the drive module further includes the 4th capacitance；
4th capacitance and the resistor coupled in parallel.
Further, in switching power circuit described above, if the circuit to be driven include first on bridge driving open
Bridge drives under pass, the second switch on the bridge, third switch on the bridge, first time bridge driving switch, second time bridge driving switch and third
Switch, and bridge driving switch connects altogether under first time bridge driving switch, second time bridge driving switch and the third
It connects, the switching power circuit includes the first switch on the bridge drive module being connected with bridge driving switch on described first and institute
State the second connected switch on the bridge drive module of bridge driving switch on second, with bridge driving switch is connected in the third third
It switch on the bridge drive module and is driven respectively with bridge under first time bridge driving switch, second bridge switch and the third
Move connected lower three bridge switch drive module.
According to the second aspect of the embodiment of the present application, a kind of driving plate, including power supply, control circuit, driving are provided
Circuit and switching power circuit as described above；
The power supply, the driving circuit and the control circuit are connected with the switching power circuit；
The control circuit is also connected with the driving circuit.
Further, driving plate described above further includes inverter circuit；
The power supply includes AC input mouth and rectification circuit；
The AC input mouth and the inverter circuit are connected with the rectification circuit respectively.
Further, driving plate described above further includes filter capacitor；
The filter capacitor is in parallel with the rectification circuit.
According to the third aspect of the embodiment of the present application, a kind of convertible frequency air-conditioner is provided, including outer machine compressor and as described above
Driving plate；
The driving plate is connected with the outer machine compressor.
Switching power circuit, driving plate and the convertible frequency air-conditioner of the application, control circuit are powered by corresponding outlet side, driving
Circuit is also powered by corresponding outlet side, and the isolation drive of driving circuit itself is realized, and, driving circuit and control circuit
Isolation drive, the negative pressure that HF switch component generates in switching process can not by circuit conduct to control circuit, shut out
Forceful electric power crosstalk absolutely leads to the component damage in control circuit into weak current part.Using the technical solution of the application, Neng Goufang
Only driving plate breaks down, and reduces driving plate failure rate.
It should be understood that above general description and following detailed description is only exemplary and explanatory, not
The application can be limited.
Description of the drawings
The drawings herein are incorporated into the specification and forms part of this specification, and shows the implementation for meeting the application
Example, and the principle together with specification for explaining the application.
Fig. 1 is the structural schematic diagram of the outlet side embodiment of the switching power circuit of the prior art；
Fig. 2 is the structural schematic diagram of the switching power circuit embodiment of the application；
Fig. 3 is the structural schematic diagram of the driving plate of the prior art；
Fig. 4 is the structural schematic diagram of the driving plate of the application.
Specific implementation mode
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the application.On the contrary, they be only with it is such as appended
The example of consistent device and method of some aspects be described in detail in claims, the application.
Fig. 1 is the structural schematic diagram of the outlet side embodiment of the switching power circuit of the prior art, as shown in Figure 1, this is opened
Powered-down source circuit only includes outlet side all the way, and all upper bridge driving switch and the driving of lower bridge in control circuit, driving circuit are opened
Close the power voltage supply that export by the outlet side, when in inverter circuit since the IGBT negative pressure generated in switching process is more than to control
When the ability to bear of circuit processed, the device in control circuit may be damaged, and driving plate is caused to break down, and lead to driving plate event
Barrier rate is higher.Therefore in order to solve the above-mentioned technical problem, this application provides following technical schemes.
Fig. 2 is the structural schematic diagram of the switching power circuit embodiment of the application, as shown in Fig. 2, the switch of the present embodiment
Power circuit can be applied in three-phase 380V business air conditioners, and transformer T, control module A and at least one are can specifically include
A drive module；Control module A includes the first rectification unit, and drive module includes the second rectification unit and partial pressure unit；Transformation
Device T includes armature winding T11, the first secondary windings T12 and second subprime winding T13 corresponding with each drive module.The
One secondary windings and the first rectification unit form the first current supply circuit；First current supply circuit is connected with circuit to be controlled；Second
Grade winding, the second rectification unit and partial pressure unit form the second current supply circuit；Second current supply circuit and the drive in circuit to be driven
Dynamic switch is connected.
For example, in three-phase 380V business air conditioners, circuit to be driven includes bridge driving switch on first, bridge is opened on second
Therefore bridge driving switch under pass, third switch on the bridge, first time bridge driving switch, second time bridge driving switch and third is such as schemed
Shown in 2, the present embodiment is to include the first switch on the bridge drive module being connected with bridge driving switch on first, be driven with bridge on second
The dynamic third switch on the bridge drive module for switching the second connected switch on the bridge drive module, being connected with bridge driving switch in third
It is with the lower three bridge switch drive module that bridge driving is connected under first time bridge driving switch, the second bridge switch and third respectively
The technical solution of the application is described in example.As shown in Fig. 2, the first rectification unit may include the first diode D1, second
Rectification unit may include the second diode D2, and partial pressure unit may include voltage-stabiliser tube VD and resistance R.
In the present embodiment, armature winding T11 is connected with power supply；First secondary windings T12 and the first diode D1 shapes
At the first current supply circuit；First current supply circuit is connected with circuit to be controlled；The armature winding T11 warps of power supply input transformer
It after first secondary windings T12 transformations, the first diode D1 rectifications, obtains controlling voltage accordingly, and treats control circuit progress
Power supply, wherein the voltage of the first power supply circuit output+15V.Second subprime winding T12, the second diode D2, voltage-stabiliser tube VD and
Resistance R forms the second current supply circuit, and voltage-stabiliser tube VD is connected with the one end being connected resistance R with ground terminal；Second current supply circuit with
Circuit to be driven is connected.The armature winding T11 of power supply input transformer is through second subprime winding T13 transformations, the two or two pole
The DC voltage of 24V is obtained after pipe D2 rectifications, and through voltage-stabiliser tube VD voltage stabilizings, after resistance R is divided, obtain the positive pressure and -9V of+15V
Negative pressure, drive circuit to be driven.Each driving switch is powered by corresponding drive module, with formed driving circuit itself every
From driving.
The switching power circuit of the present embodiment, control circuit are powered by corresponding outlet side, and driving circuit is also by corresponding
Outlet side is powered, and the isolation drive of driving circuit itself is realized, and, the isolation drive of driving circuit and control circuit is high
The negative pressure that frequency switching component generates in switching process can not by circuit conduct to control circuit, prevented forceful electric power crosstalk into
Weak current part leads to the component damage in control circuit.Using the technical solution of the application, it can prevent driving plate from event occurs
Barrier, reduces driving plate failure rate.
During specific implementation at one, if the power supply being connected with switching power circuit is derived from a phase line and zero curve,
There may be the zero curve of input line is accessed firewire when staff's wiring, cause electric at press plates switching power circuit
Hold suffered voltage and generates explosion, compressor emergency shutdown report communication failure more than permissible value.It is first unpluged in the process of running alternatively, depositing
The power cord line of powered-down source circuit and lead to control circuit power down and the busbar after rectification also has the situation of electricity, lead to inverter circuit
In inverter it is uncontrolled, will produce when serious up and down bridge short circuit directly burn inverter.Therefore, to solve the above-mentioned problems,
Present invention also provides following technical schemes.
Specifically, in the present embodiment, power supply is the rectification circuit pair three in external convertible frequency air conditioner driven compressor plate
Phase alternating current carries out the direct current obtained after rectification.Accordingly, in armature winding T11 and external convertible frequency air conditioner driven compressor plate
Rectification circuit be connected.The external power interface that switching power circuit can be cancelled in this way, has fundamentally prevented staff's mistake
The possibility of operation effectively prevents being likely to occur the case where zero curve of input line is accessed firewire when staff's wiring,
Alternatively, occurring first pulling out the power cord line of switching power circuit in operational process and leading to control circuit power down and the busbar after rectification
Also electric situation.
The switching power circuit of the present embodiment has prevented the possibility that the above failure generates, greatly at all from design
The stability for improving driving plate reduces failure rate, and then reduces the probability for replacing driving plate, reduces breakdown maintenance
Cost.
As shown in Fig. 2, the switching power circuit of the present embodiment can also include control switch K, control switch K and primary around
The circuits to be formed of connecting group T11 are connected with rectification circuit, wherein it is preferably that MOSFET is managed to control switch K.In the present embodiment,
After the rectified circuit rectifies of three-phase alternating current of 380V, the direct current of 540V is obtained, when being powered to switching power circuit, by
The secondary windings inverse electromotive force of transformer and leakage inductance zone of action are come when the fluctuation of power grid ± 20% is plus the K shutdowns of control switch
200V or more voltage so that the voltage of input switch power circuit is higher, therefore, is required according to safety, the present embodiment
The breakdown voltage of control switch K in switching power circuit is 900-1000V, and carries out external setting.
In practical applications, the switching power circuit of the present embodiment further includes the first capacitance C1 and the second capacitance C2；First
The first end of secondary windings T12 is connected with the anode of the first diode D1；The first end of first capacitance C1 and the first diode D1
Cathode be connected, the second end of the first capacitance C1 is connected with the second end of the first secondary windings T12；Second subprime winding T13's
First end is connected with the anode of the second diode D2；The first end of second capacitance C2 is connected with the cathode of the second diode D2, the
The second end of two capacitance C2 is connected with the second end of second subprime winding T13.Each secondary windings of transformer T1 is by corresponding to
Diode rectification after, by corresponding capacitance carry out energy storage, to obtain stable voltage.
As shown in Fig. 2, the drive module of the present embodiment further includes third capacitance C3 and the 4th capacitance C4, third capacitance C3 with
Voltage-stabiliser tube VD is in parallel, after each voltage-stabiliser tube VD voltage stabilizings, carries out energy storage by corresponding capacitance, obtains stable positive voltage.4th electricity
It is in parallel with resistance R to hold C4, after each resistance R partial pressures, energy storage is carried out by corresponding capacitance, obtains stable negative voltage.
Fig. 3 is the structural schematic diagram of the driving plate of the prior art, as shown in figure 3, driving plate in the prior art includes supplying
Power supply 10, control circuit 11, driving circuit 12, inverter circuit 13 and switching power circuit 14；Power supply 10 and driving electricity
Road 12 is connected with inverter circuit 13；Driving circuit 12 and control circuit 11 are connected with switching power circuit 14；Control circuit
11 are also connected with driving circuit 12, and inverter circuit 13 is connected with the external compression machine of convertible frequency air-conditioner.Wherein, switching power circuit 14 is
Switching power circuit shown in FIG. 1.Switching power circuit 14 in three-phase alternating current a phase line and zero curve be connected, from three intersection
Galvanic electricity takes electricity, after transformer transformation, diode rectification, capacitive energy storage, output voltage all the way is obtained, respectively to control circuit
11, all switch on the bridges in driving circuit 12 and bridge switch are powered.
Fig. 4 is the structural schematic diagram of the driving plate of the application, as shown in figure 4, the driving plate in the present embodiment includes power supply
Power supply 10, control circuit 11, driving circuit 12, inverter circuit 13 and switching power circuit 14；Power supply 10 and driving circuit
12 are connected with inverter circuit 13；Driving circuit 12 and control circuit 11 are connected with switching power circuit 14；Control circuit 11
Also it is connected with driving circuit 12, inverter circuit 13 is connected with the external compression machine of convertible frequency air-conditioner.Switching power circuit 14 is using Fig. 2 institutes
The switching power circuit shown.
The switching power circuit of the present embodiment, control circuit are powered by corresponding outlet side, and driving circuit is also by corresponding
Outlet side is powered, and the isolation drive of driving circuit itself is realized, and, the isolation drive of driving circuit and control circuit is high
The negative pressure that frequency switching component generates in switching process can not by circuit conduct to control circuit, prevented forceful electric power crosstalk into
Weak current part leads to the component damage in control circuit.Using the technical solution of the application, it can prevent driving plate from event occurs
Barrier, reduces driving plate failure rate.
For example, power supply 10 includes AC input mouth 101 and rectification circuit 102；101 He of AC input mouth
Inverter circuit 14 is connected with rectification circuit 102 respectively.And switching power circuit 14 is connected with rectification circuit 102, with from rectified current
Road 102 takes electricity, so as to cancel the external power interface of switching power circuit 14, has fundamentally prevented staff's maloperation
Possibility, that is, effectively prevent being likely to occur the case where zero curve of input line is accessed into firewire when staff's wiring, alternatively,
Occur first pulling out the power cord line of switching power circuit 14 in operational process and leading to 11 power down of control circuit and the busbar after rectification
Also electric situation.
It should be noted that in the present embodiment, if switching power circuit 14 uses switching power circuit shown in FIG. 1, together
Sample may be used switching power circuit 14 and be connected with rectification circuit 102, in a manner of taking electricity from rectification circuit 102, realizes and cancels
The external power interface of switching power circuit 14 has fundamentally prevented the possibility of staff's maloperation, that is, has effectively prevented
The case where zero curve of input line is accessed into firewire is likely to occur when staff's wiring, alternatively, occurring first unpluging in operational process
The power cord line of powered-down source circuit 14 and lead to 11 power down of control circuit and the busbar after rectification also has the situation of electricity.
As shown in figure 4, the driving plate in the present embodiment further includes filter capacitor, the filter capacitor and rectification circuit 102 are simultaneously
Connection promotes efficient smooth direct current output to reduce AC ripple ripple coefficient.
The application also provides a kind of convertible frequency air-conditioner, which includes the driving of outer machine compressor and embodiment as above
Plate；The driving plate is connected with outer machine compressor.
It is understood that same or similar part can mutually refer in the various embodiments described above, in some embodiments
Unspecified content may refer to same or analogous content in other embodiment.
It should be noted that in the description of the present application, term " first ", " second " etc. are used for description purposes only, without
It can be interpreted as indicating or implying relative importance.In addition, in the description of the present application, unless otherwise indicated, the meaning of " multiple "
Refer at least two.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is contained at least one embodiment or example of the application.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiments or example in can be combined in any suitable manner.
Although embodiments herein has been shown and described above, it is to be understood that above-described embodiment is example
Property, it should not be understood as the limitation to the application, those skilled in the art within the scope of application can be to above-mentioned
Embodiment is changed, changes, replacing and modification.
Claims (13)
1. a kind of switching power circuit, which is characterized in that including transformer, control module and at least one drive module；
The control module includes the first rectification unit, and the drive module includes the second rectification unit and partial pressure unit；
The transformer include armature winding, the first secondary windings and second subprime corresponding with each drive module around
Group；
The armature winding is connected with the power supply；
First secondary windings forms the first current supply circuit with first rectification unit；First current supply circuit with it is described
Circuit to be controlled is connected；
The second subprime winding, second rectification unit and the partial pressure unit form the second current supply circuit；Described second
Current supply circuit is connected with the driving switch in circuit to be driven.
2. switching power circuit according to claim 1, which is characterized in that the power supply is external convertible frequency air conditioner pressure
What the rectification circuit in contracting machine driving plate obtained；
Accordingly, the armature winding is connected with the rectification circuit.
3. switching power circuit according to claim 2, which is characterized in that further include control switch；
The circuit that the control switch is formed with the primary windings connected in series is connected with the rectification circuit.
4. switching power circuit according to claim 3, which is characterized in that the breakdown voltage for controlling switch is 900V-
1000V。
5. switching power circuit according to claim 1, which is characterized in that first rectification unit is the one or two pole
Pipe；Second rectification unit is the second diode；The partial pressure unit includes voltage-stabiliser tube and resistance.
6. switching power circuit according to claim 5, which is characterized in that further include the first capacitance and the second capacitance；
The first end of first secondary windings is connected with the anode of first diode；The first end of first capacitance with
The cathode of first diode is connected, and the second end of first capacitance is connected with the second end of first secondary windings；
The first end of the second subprime winding is connected with the anode of second diode；The first end of second capacitance with
The cathode of second diode is connected, and the second end of second capacitance is connected with the second end of the second subprime winding.
7. switching power circuit according to claim 5, which is characterized in that the drive module further includes third capacitance；
The third capacitance is in parallel with the voltage-stabiliser tube.
8. switching power circuit according to claim 5, which is characterized in that the drive module further includes the 4th capacitance；
4th capacitance and the resistor coupled in parallel.
9. according to any switching power circuits of claim 1-8, which is characterized in that if the circuit to be driven includes the
Bridge driving switch on one, the second switch on the bridge, third switch on the bridge, first time bridge driving switch, second time bridge driving switch and
Bridge driving switch under third, and bridge drives under first time bridge driving switch, second time bridge driving switch and the third
Dynamic switch common ground connection, the switching power circuit include that the first switch on the bridge being connected with bridge driving switch on described first is driven
Dynamic model block, the second switch on the bridge drive module being connected with bridge driving switch on described second are opened with bridge driving in the third
Close connected third switch on the bridge drive module and respectively with first time bridge driving switch, second bridge switch and institute
State the lower three bridge switch drive module that bridge driving is connected under third.
10. a kind of driving plate, which is characterized in that including power supply, control circuit, driving circuit and such as claim 1-9 appoints
Switching power circuit described in one；
The power supply, the driving circuit and the control circuit are connected with the switching power circuit；
The control circuit is also connected with the driving circuit.
11. driving plate according to claim 10, which is characterized in that further include inverter circuit；
The power supply includes AC input mouth and rectification circuit；
The AC input mouth and the inverter circuit are connected with the rectification circuit respectively.
12. driving plate according to claim 10, which is characterized in that further include filter capacitor；
The filter capacitor is in parallel with the rectification circuit.
13. a kind of convertible frequency air-conditioner, which is characterized in that including outer machine compressor and as claim 10-12 any one of them is driven
Movable plate；
The driving plate is connected with the outer machine compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810809314.4A CN108768179A (en) | 2018-07-20 | 2018-07-20 | Switching power circuit, driving plate and convertible frequency air-conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810809314.4A CN108768179A (en) | 2018-07-20 | 2018-07-20 | Switching power circuit, driving plate and convertible frequency air-conditioner |
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| CN108768179A true CN108768179A (en) | 2018-11-06 |
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| CN201810809314.4A Pending CN108768179A (en) | 2018-07-20 | 2018-07-20 | Switching power circuit, driving plate and convertible frequency air-conditioner |
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| CN110311540A (en) * | 2019-07-22 | 2019-10-08 | 珠海格力电器股份有限公司 | A kind of isolation control circuit, frequency converter and air-conditioning |
| CN110762808A (en) * | 2019-10-31 | 2020-02-07 | 广东美的制冷设备有限公司 | Drive control circuit and air conditioner |
| CN110797836A (en) * | 2019-11-28 | 2020-02-14 | 北京Abb电气传动系统有限公司 | Circuit for switching power supply in motor driver, operation method and motor driving circuit system |
| CN111308229A (en) * | 2020-02-24 | 2020-06-19 | 广东美的暖通设备有限公司 | Drive control circuit and air conditioner |
| WO2022121890A1 (en) * | 2020-12-07 | 2022-06-16 | 昱能科技股份有限公司 | Power supply system and solar photovoltaic inverter |
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