CN107990505A - Frequency conversion control circuit and air conditioner - Google Patents
Frequency conversion control circuit and air conditioner Download PDFInfo
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- CN107990505A CN107990505A CN201711390673.2A CN201711390673A CN107990505A CN 107990505 A CN107990505 A CN 107990505A CN 201711390673 A CN201711390673 A CN 201711390673A CN 107990505 A CN107990505 A CN 107990505A
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Abstract
The present invention provides a kind of frequency conversion control circuit and air conditioner, wherein, frequency conversion control circuit includes：Inverter control unit, it is connected to power factor correction unit, inverter control unit is additionally coupled to the second sampling end of DC bus-bar voltage signal, for comparing the sampled voltage of the second sampling end and the magnitude relationship of predeterminated voltage, and the whether abnormal signal of DC bus-bar voltage signal is sent to PFC control units according to magnitude relationship, the signal that PFC control units are sent according to inverter control unit according to the sampled voltage of the first sampling end to determine whether carry out Voltage loop control and the conducting and cut-off of adjusting PFC switching devices.Pass through technical scheme, it is possible to increase the reliability of frequency conversion control circuit, and then improve the reliability of air conditioner.
Description
Technical field
It is empty in particular to a kind of frequency conversion control circuit and one kind the present invention relates to technical field of frequency-conversion air conditioner control
Adjust device.
Background technology
PFC (Power Factor Correction, PFC) generally use current inner loop and outer voltage
Double-closed-loop control structure, the effect of Voltage loop are to adjust PFC output voltages to make it keep stablizing, and Voltage loop input signal is usually
The feedback signal of PFC output voltages, is derived from electric resistance partial pressure.
But when the resistance value of divider resistance in electric resistance partial pressure changes, such as divider resistance because vulcanization causes resistance value to become
Small, the feedback signal of PFC output voltages also changes therewith, and PFC output voltages may be caused to raise extremely, or even can exceed flat
The load voltage value of sliding electrolytic capacitor and other electronic components, ultimately results in the failure of device, so as to influence product quality.
The content of the invention
It is contemplated that at least solve one of technical problem present in the prior art or correlation technique.
For this reason, it is an object of the present invention to provide a kind of frequency conversion control circuit.
It is another object of the present invention to provide a kind of air conditioner.
To achieve these goals, embodiment according to the first aspect of the invention, there is provided a kind of frequency conversion control circuit,
Including：Inverter control unit, is connected to PFC control units, and inverter control unit is additionally coupled to DC bus-bar voltage signal
The second sampling end, for comparing the sampled voltage of the second sampling end and the magnitude relationship of predeterminated voltage, and according to magnitude relationship
To judge whether DC bus-bar voltage signal abnormal, and to PFC control units send whether abnormal signal, PFC control units
The signal sent according to inverter control unit according to the sampled voltage of the first sampling end to determine whether carry out Voltage loop control
And adjust the conducting and cut-off of PFC switching devices.
In the technical scheme, inverter control unit is by comparing the size of dc bus sampled voltage and predeterminated voltage
Relation judges whether DC bus-bar voltage signal abnormal, and to PFC control units send whether abnormal signal, PFC controls are single
The signal that member is sent according to inverter control unit according to the sampled voltage of the first sampling end to determine whether carry out Voltage loop control
The conducting and cut-off of system and adjustment PFC switching devices, improve the reliability of frequency conversion control circuit.Inverter control unit connects
The second sampling end of DC bus-bar voltage signal is connected to, the sampled voltage of dc bus is obtained by voltage sampling circuit, wherein,
The sampled voltage that the sample circuit of inverter control unit obtains can be represented with equation below：
Wherein, VFB2Voltage, R are used for the second sampling endFB4, RFB5, RFB6For three divider resistances of the second sampling end,
VPFCFor the magnitude of voltage of DC bus-bar voltage signal.
Compare the sampled voltage of the second sampling end and the size of predeterminated voltage, when judging that the sampled voltage is more than predeterminated voltage
When, inverter control unit sends DC bus-bar voltage abnormal signal, via the connection of inversion control unit and PFC control units
Circuit is sent to PFC control units, and PFC control units stop the sampled voltage according to the first sampling end according to the abnormal signal
Carry out Voltage loop control and adjust the conducting and cut-off of PFC switching devices, directly turn off PFC switching devices.
Above-mentioned PFC control units, PFC switching devices, booster diode and PFC inductance together constitute pfc circuit.When sentencing
When the disconnected sampled voltage is less than or equal to predeterminated voltage, inverter control unit sends DC bus-bar voltage normal signal or does not send
Any signal, since PFC control units are connected to the first sampling end of bus voltage signal, PFC control units are adopted according to first
The sampled voltage at sample end carries out the conducting and cut-off of Voltage loop control PFC switching devices.
Preferably, the second sampling end of DC bus-bar voltage signal is except for judging whether DC bus-bar voltage signal is different
Often, the current loop control as DC MOTOR CONTROL is also indispensable parameter.
Preferably, what the first sample circuit and the second sample circuit detected is all DC bus-bar voltage signal, i.e., first adopts
Sample end and the second sampling end are all derived from the both ends of filter circuit (i.e. smoothing electrolytic capacitance).
In any of the above-described technical solution, it is preferable that frequency conversion control circuit further includes：Rectification circuit, arranged on frequency control
The input terminal of circuit, for AC-input voltage to be transformed to pulsating dc voltage.
In any of the above-described technical solution, it is preferable that rectification circuit is bridge rectifier.
In any of the above-described technical solution, it is preferable that frequency conversion control circuit further includes：Filter circuit, is connected to rectified current
The output terminal on road, filter circuit are used for the ripple voltage for filtering off rectification circuit output, the pulsating dc voltage after rectification are converted
Into smooth DC voltage.
Specifically, filter circuit is connected to the output terminal of rectification circuit, and filter circuit is used to filter off rectification circuit output
Pulsating dc voltage after rectification, is transformed into smooth DC voltage by ripple voltage.
In any of the above-described technical solution, it is preferable that filter circuit includes multiple in parallel and/or series connection electrolytic capacitor,
The cathode of filter circuit is connected to the first sampling end, the anode ground connection of filter circuit.
In any of the above-described technical solution, it is preferable that frequency conversion control circuit further includes：Inverter circuit, inverter circuit are used for
By DC power conversion into alternating current, arranged on the output terminal of frequency conversion control circuit, be made of 6 conductive arms, each conductive arm by
IGBT and reverse recovery diodes compose in parallel.
In any of the above-described technical solution, it is preferable that frequency conversion control circuit further includes：Pfc circuit, pfc circuit are used to change
Kind power factor, is made of PFC switching devices, booster diode, PFC inductance and PFC control units.
In any of the above-described technical solution, it is preferable that PFC inductance connections are in the output terminal and filter circuit of rectification circuit
Between input terminal, the anode of booster diode is connected to the output terminal of PFC inductance, and the cathode of booster diode is connected to filtered electrical
The input terminal on road, the output terminal of PFC control units are connected to the gate terminal of PFC switching devices, and the collector of PFC switching devices connects
The anode of booster diode is connected to, the emitter of PFC switching devices is connected to one end of sampling resistor, the other end of sampling resistor
Ground connection.
In any of the above-described technical solution, it is preferable that PFC control units include：First error amplifier, the first error are put
The negative input of big device is connected to the first sampling end, and the electrode input end access reference voltage of the first error amplifier, is used for
Export the voltage error signal between the sampled voltage and reference voltage of the first sampling end；Multiplier, the first input of multiplier
End is connected to the output terminal of the first error amplifier, and for obtaining voltage error signal, the second input terminal access of multiplier is whole
The rectified voltage signal of current circuit output；Second error amplifier, the negative input of the second error amplifier are connected to PFC and open
Between the emitter and sampling resistor that close device, the multiplication meter of the electrode input end access multiplier output of the second error amplifier
Calculate result；PWM comparators, the triangular wave of the positive terminal access oscillator output of PWM comparators, the negative pole end of PWM comparators connect
The output terminal of the second error amplifier is connected to, the output terminal of PWM comparators is connected to the gate terminal of PFC switching devices, for defeated
Go out pwm signal to control the conducting of PFC switching devices and cut-off.
Technical solution according to the second aspect of the invention, there is provided a kind of air conditioner, including：Motor；It is such as any of the above-described
The frequency conversion control circuit of item technical solution, the output terminal of frequency conversion control circuit are connected to the input terminal of motor.
The additional aspect and advantage of the present invention will provide in following description section, will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination accompanying drawings below to embodiment
Substantially and it is readily appreciated that, wherein：
Fig. 1 shows the schematic diagram of frequency conversion control circuit according to an embodiment of the invention；
Fig. 2 shows the schematic diagram of frequency conversion control circuit according to another embodiment of the invention；
Fig. 3 shows the schematic diagram of the frequency conversion control circuit of air conditioner according to an embodiment of the invention.
Wherein, reference numeral and its corresponding structure are entitled：PFC switching element Ts, inverter control unit 106, first
Sampling end A, the second sampling end B, rectification circuit 102, filter circuit 104, inverter circuit 108, PFC control units 110, PFC electricity
Feel L, booster diode D, the first sampling end divider resistance RFB1、RFB2、RFB3, the second sampling end divider resistance RFB4、RFB5、RFB6,
Sampling resistor RCS, electrolytic capacitor E1, electrolytic capacitor E2, electrolytic capacitor E3, resistance RIAC, resistance RM, the second error amplifier 202,
PWM comparators 204, the first error amplifier 206, multiplier 208, self-oscillator OSC, motor M.
Embodiment
It is to better understand the objects, features and advantages of the present invention, below in conjunction with the accompanying drawings and specific real
Mode is applied the present invention is further described in detail.It should be noted that in the case where there is no conflict, the implementation of the application
Feature in example and embodiment can be mutually combined.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
To be implemented using other different from other modes described here, therefore, protection scope of the present invention and from described below
Specific embodiment limitation.
Fig. 1 shows the schematic diagram of frequency conversion control circuit according to an embodiment of the invention.
Fig. 2 shows the schematic diagram of frequency conversion control circuit according to another embodiment of the invention；
Fig. 3 shows the schematic diagram of the frequency conversion control circuit of air conditioner according to an embodiment of the invention.
Frequency conversion control circuit according to an embodiment of the invention is specifically described with reference to Fig. 1 and Fig. 2.
As shown in Figure 1, frequency conversion control circuit according to an embodiment of the invention, including：Inverter control unit 106, even
PFC control units 110 are connected to, inverter control unit 106 is additionally coupled to the second sampling end B of DC bus-bar voltage signal, uses
In the sampled voltage and the magnitude relationship of predeterminated voltage that compare the second sampling end B, and dc bus is judged according to magnitude relationship
Whether voltage signal abnormal, and to PFC control units 110 send whether abnormal signal, PFC control units are according to inverter control
The signal that unit processed is sent according to the sampled voltage progress Voltage loop control and adjusting PFC of the first sampling end to determine whether open
Close the conducting and cut-off of device.
In the technical scheme, inverter control unit 106 is by comparing dc bus sampled voltage and predeterminated voltage
Magnitude relationship judges whether DC bus-bar voltage signal abnormal, and to PFC control units 110 send whether abnormal signal, PFC
Signal that control unit 110 is sent according to inverter control unit 106 is to determine whether sampled voltage according to the first sampling end A
Carry out Voltage loop control and adjust the conducting and cut-off of PFC switching devices, improve the reliability of frequency conversion control circuit.Inversion
Device control unit 106 is connected to the second sampling end B of DC bus-bar voltage signal, and dc bus is obtained by voltage sampling circuit
Sampled voltage, wherein, the sampled voltage that the sample circuit of inverter control unit 106 obtains can be represented with equation below：
Wherein, VFB2For the sampled voltage of 106 second sampling end B of inverter control unit, RFB4, RFB5, RFB6For inverter
Three divider resistances of 106 second sampling end B of control unit, RFB4, RFB5, RFB6Three divider resistances can be, but not limited to,
VPFCFor the magnitude of voltage of DC bus-bar voltage signal.
Similarly, the sampled voltage for the first sampling end A that PFC control units 110 detect, can be represented with equation below：
Wherein, VFB1For the sampled voltage of the first sampling end A, RFB1, RFB2, RFB3For three partial pressure electricity of the first sampling end A
Resistance, namely the resistance for causing resistance value to be drifted about that may cure, RFB1, RFB2, RFB3Three divider resistances can be, but not limited to,
VPFCFor the magnitude of voltage of DC bus-bar voltage signal.
Preferably, whether the second sampling end B of DC bus-bar voltage signal is except for judging DC bus-bar voltage signal
Abnormal, the current loop control as DC MOTOR CONTROL is also indispensable parameter.
Preferably, what the first sample circuit and the second sample circuit detected is all DC bus-bar voltage signal, i.e., first adopts
Sample end A and the second sampling end B is derived from the both ends of filter circuit (i.e. smoothing electrolytic capacitance).Compare the sampling of the second sampling end B
The size of voltage and predeterminated voltage, when judging that the sampled voltage is more than predeterminated voltage, inverter control unit 106 sends direct current
Busbar voltage abnormal signal, it is single to be sent to PFC controls via the connection circuit of inversion control unit 106 and PFC control units 110
110, PFC of member control units 110 stop carrying out Voltage loop control according to the sampled voltage of the first sampling end A according to the abnormal signal
The conducting and cut-off of system and adjustment PFC switching devices, directly turn off PFC switching element Ts, above-mentioned PFC control units 110, PFC
Switching element T, booster diode D and PFC inductance L together constitute pfc circuit.When judging that it is default that the sampled voltage is less than or equal to
During voltage, inverter control unit 106 sends DC bus-bar voltage normal signal or does not send any signal, since PFC is controlled
Unit 110 is connected to the first sampling end A, PFC control unit 110 of bus voltage signal according to the sampling electricity of the first sampling end A
Pressure carries out the conducting and cut-off of Voltage loop control PFC switching element Ts.
In any of the above-described technical solution, it is preferable that frequency conversion control circuit further includes：Rectification circuit 102, arranged on frequency conversion control
The input terminal of circuit processed, for AC-input voltage to be transformed to DC voltage, is made of four diodes, four diodes point
Wei not VD11、VD12、VD13And VD14。
In any of the above-described technical solution, it is preferable that rectification circuit 102 is bridge rectifier.
In any of the above-described technical solution, it is preferable that frequency conversion control circuit further includes：Filter circuit 104, is connected to rectification
The output terminal of circuit 102, filter circuit 104 is used for the ripple voltage for filtering off the output of rectification circuit 102, and the pulsation after rectification is straight
Galvanic electricity is transformed into smooth direct current, and filter circuit is made of one or more electrolytic capacitors.
Wherein, filter circuit 104 can include multiple electrolytic capacitors, as shown in Figure 1 by three electrolytic capacitor E1 in parallel,
The electrolytic capacitor of electrolytic capacitor E2 and electrolytic capacitor E3 compositions or a larger capacitance.
In any of the above-described technical solution, it is preferable that filter circuit 104 includes multiple in parallel and/or series connection electrolysis electricity
Hold, the cathode of filter circuit 104 is connected to the first sampling end A, the anode ground connection of filter circuit 104.
In any of the above-described technical solution, it is preferable that frequency conversion control circuit further includes：Inverter circuit 108, inverter circuit
108 are used for the alternating current by DC power conversion into frequency-adjustable, arranged on the output terminal of frequency conversion control circuit, by 6 conductive arm groups
Into each conductive arm is composed in parallel by IGBT and reverse recovery diodes.
Wherein, six conductive arms are respectively TOn U、TUnder U、TOn V、TUnder V、TOn W、TUnder W。
In any of the above-described technical solution, it is preferable that frequency conversion control circuit further includes：Pfc circuit, pfc circuit are used to change
Kind power factor, is made of PFC switching element Ts, booster diode D, PFC inductance L and PFC control unit 110.
In any of the above-described technical solution, it is preferable that PFC inductance connections are in the output terminal and filtered electrical of rectification circuit 102
Between the input terminal on road 104, the anode of booster diode D is connected to the output terminal of PFC inductance L, and the cathode of booster diode D connects
The input terminal of filter circuit 104 is connected to, the output terminal of PFC control units 110 is connected to the grid of PFC switching element Ts, and PFC is opened
The collector for closing device T is connected to the anode of booster diode D, and the emitter of PFC switching element Ts is connected to sampling resistor RCS's
One end, sampling resistor RCSThe other end ground connection.
As shown in Fig. 2, in any of the above-described technical solution, it is preferable that PFC control units 110 include：First error is amplified
Device 206, the negative input of the first error amplifier 206 are connected to the first sampling end A, the cathode of the first error amplifier 206
Input terminal access reference voltage VREF, for the voltage error letter between the sampled voltage and reference voltage of the first sampling end A of output
Number；Multiplier 208, the first input end of multiplier 208 is connected to the output terminal of the first error amplifier 206, for obtaining electricity
Difference signal is held up, the second input terminal of multiplier 208 passes through resistance RIACThe rectified voltage signal that rectification circuit 102 exports is accessed,
Multiplier 208 generates the product of voltage error signal and rectified voltage signal；Second error amplifier 202, the amplification of the second error
The negative input of device 202 is connected to PFC switching element Ts emitter and sampling resistor RCSBetween, PFC switching devices are flowed through in input
The current signal of T, the multiplication result of calculation of the electrode input end access output of multiplier 208 of the second error amplifier 202, second
The electrode input end of error amplifier 202 is further connected with protective resistance RM, protective resistance RMGround connection；PWM comparators 204, PWM compares
The positive terminal access of device 204 carrys out the triangular signal of self-oscillator OSC, and the negative pole end of PWM comparators 204 is connected to the second error
The output terminal of amplifier 202, the output terminal of PWM comparators 204 is connected to the gate terminal of PFC switching element Ts, for exporting PWM
Signal is to adjust the conducting of PFC switching element Ts and cut-off.
Fig. 3 shows the schematic diagram of the motor-drive circuit of air conditioner according to an embodiment of the invention.
As shown in figure 3, the motor-drive circuit of air conditioner according to an embodiment of the invention, is connected to exchange input
Between holding AC and motor M, specifically include successively：Rectification circuit unit 302, circuit of power factor correction unit 304, filter circuit
Unit 306 and inverter circuit unit 308, wherein, rectification circuit unit 302 include Fig. 1 shown in rectification circuit 102, power because
Plain correcting circuit unit 304 includes pfc circuit, specifically include PFC control units 110 shown in Fig. 2 and PFC switching element Ts,
PFC inductance L, booster diode D (can use boosting fast recovery diode), filter circuit unit 306 includes in parallel and/or series connection
Multiple electrolytic capacitors (capacitance E1, capacitance E2 and capacitance E3 shown in Fig. 1), wherein, in order to improve circuit of power factor correction
The reliability of unit 304, control inverter circuit unit 308 is transmitted to the sampled signal of DC bus-bar voltage signal power because
Number correcting circuit unit 304, to reduce the resistance of divider resistance in the voltage loop control circuit of circuit of power factor correction unit 304
The influence that value drift controls PFC Voltage loops.
Be described in detail technical scheme above in association with attached drawing, the present invention propose a kind of frequency conversion control circuit and
Air conditioner, by comparing the dc bus sampled voltage of inverter circuit unit and the magnitude relationship of predeterminated voltage, reduce power because
Influence of the resistance value drift of divider resistance to the control of PFC Voltage loops, is improved in the voltage loop control circuit of number correcting circuit unit
The reliability of frequency conversion control circuit, also further increasing the reliability of air conditioner.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the invention, for the skill of this area
For art personnel, the invention may be variously modified and varied.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of frequency conversion control circuit, the frequency conversion control circuit includes PFC switching devices and PFC control units, the PFC controls
Unit processed is connected to the gate terminal of the PFC switching devices, and the PFC control units are additionally coupled to the DC bus-bar voltage letter
Number the first sampling end, for carrying out Voltage loop control and the adjustment PFC according to the sampled voltage of first sampling end
The conducting and cut-off of switching device, it is characterised in that the frequency conversion control circuit includes：
Inverter control unit, is connected to the PFC control units, it is female that the inverter control unit is additionally coupled to the direct current
Second sampling end of line voltage signal, for the sampled voltage of second sampling end and the magnitude relationship of predeterminated voltage,
And judge whether the DC bus-bar voltage signal is abnormal according to the magnitude relationship, and sent to the PFC control units
Whether abnormal signal, the signal that the PFC control units are sent according to the inverter control unit is to determine whether according to institute
The sampled voltage for stating the first sampling end carries out the Voltage loop control and adjusts the conducting and cut-off of the PFC switching devices.
2. frequency conversion control circuit according to claim 1, it is characterised in that further include：
Rectification circuit, arranged on the input terminal of the frequency conversion control circuit, for AC-input voltage to be transformed to Rectified alternating current
Pressure.
3. frequency conversion control circuit according to claim 2, it is characterised in that
The rectification circuit is bridge rectifier.
4. frequency conversion control circuit according to claim 2, it is characterised in that further include：
Filter circuit, is connected to the output terminal of the rectification circuit, and the filter circuit is used to filter off the rectification circuit output
Ripple voltage, the pulsating dc voltage after rectification is transformed into smooth DC voltage.
5. frequency conversion control circuit according to claim 4, it is characterised in that
The filter circuit includes multiple in parallel and/or series connection electrolytic capacitor, and the cathode of the filter circuit is connected to described
First sampling end, the anode ground connection of the filter circuit.
6. frequency conversion control circuit according to claim 1, it is characterised in that further include：
Inverter circuit, the inverter circuit is used for DC power conversion into alternating current, arranged on the output of the frequency conversion control circuit
End, is made of 6 conductive arms, and each conductive arm is composed in parallel by IGBT and reverse recovery diodes.
7. frequency conversion control circuit according to claim 4, it is characterised in that further include：
Pfc circuit, the pfc circuit is used to improve power factor, by the PFC switching devices, booster diode, PFC inductance
And the PFC control units composition.
8. frequency conversion control circuit according to claim 7, it is characterised in that
The PFC inductance connections are between the output terminal of the rectification circuit and the input terminal of the filter circuit, the boosting
The anode of diode is connected to the output terminal of the PFC inductance, and the cathode of the booster diode is connected to the filter circuit
Input terminal, the output terminal of the PFC control units is connected to the gate terminal of the PFC switching devices, the PFC switching devices
Collector be connected to the anode of the booster diode, the emitter of the PFC switching devices is connected to the one of sampling resistor
End, the other end ground connection of the sampling resistor.
9. frequency conversion control circuit according to claim 7, it is characterised in that the PFC control units include：
First error amplifier, the negative input of first error amplifier are connected to first sampling end, and described
The electrode input end access reference voltage of one error amplifier, for the sampled voltage for exporting first sampling end and the ginseng
Examine the voltage error signal between voltage；
Multiplier, the first input end of the multiplier is connected to the output terminal of first error amplifier, for obtaining
Voltage error signal is stated, the second input terminal of the multiplier accesses the rectified voltage signal of the rectification circuit output；
Second error amplifier, the negative input of second error amplifier are connected to the transmitting of the PFC switching devices
Between pole and sampling resistor, the electrode input end of second error amplifier accesses the multiplication calculating knot of the multiplier output
Fruit；
PWM comparators, the triangular wave of the positive terminal access oscillator output of the PWM comparators, the anode of the PWM comparators
End is connected to the output terminal of second error amplifier, and the output terminal of the PWM comparators is connected to the PFC switching devices
Gate terminal, for exporting the pwm signal to control the conducting and cut-off of the PFC switching devices.
A kind of 10. air conditioner, it is characterised in that including：
Motor；
Frequency conversion control circuit as claimed in any one of claims 1-9 wherein, the output terminal of the frequency conversion control circuit are connected to institute
State the input terminal of motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711390673.2A CN107990505A (en) | 2017-12-21 | 2017-12-21 | Frequency conversion control circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711390673.2A CN107990505A (en) | 2017-12-21 | 2017-12-21 | Frequency conversion control circuit and air conditioner |
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| Publication Number | Publication Date |
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| CN107990505A true CN107990505A (en) | 2018-05-04 |
Family
ID=62039320
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711390673.2A Pending CN107990505A (en) | 2017-12-21 | 2017-12-21 | Frequency conversion control circuit and air conditioner |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111645490A (en) * | 2020-06-11 | 2020-09-11 | 江苏罗思韦尔电气有限公司 | Automobile air conditioner temperature controller and fault repairing method thereof |
| CN112283907A (en) * | 2020-10-26 | 2021-01-29 | Tcl空调器(中山)有限公司 | Fan shutdown control method and control circuit and air conditioner |
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| CN111645490A (en) * | 2020-06-11 | 2020-09-11 | 江苏罗思韦尔电气有限公司 | Automobile air conditioner temperature controller and fault repairing method thereof |
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| CN112283907A (en) * | 2020-10-26 | 2021-01-29 | Tcl空调器(中山)有限公司 | Fan shutdown control method and control circuit and air conditioner |
| CN112283907B (en) * | 2020-10-26 | 2022-06-10 | Tcl空调器(中山)有限公司 | Fan shutdown control method and control circuit and air conditioner |
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