阅读说明：本技术 一种变频器控制装置及方法、空调 (A kind of frequency changer controller and method, air-conditioning ) 是由 尹发展 牟宗娥 张新建 陈建兵 牛建勇 于 2019-08-29 设计创作，主要内容包括：本申请的实施例提供一种变频器控制装置及方法、空调,涉及制冷设备领域,在解决直流母线电压异常升高的问题的同时,很好的控制了设备成本。该变频器控制装置应用于空调,空调包括压缩机、变频器、整流滤波电路以及控制器,变频器与整流滤波电路通过第一直流母线以及第二直流母线耦合,第一直流母线和第二直流母线之间串联薄膜电容；变频器控制装置,包括：处理模块,用于当确定电源断电或者空调停机,并且确定第一直流母线上的电压超过第一预设电压阈值时,生成泄压PWM信号；发送模块,用于将处理模块生成的泄压PWM信号输出至变频器,变频器根据泄压PWM信号开启至少一个电桥的上桥臂,并开启其他电桥中至少一个电桥的下桥臂。用于变频器控制。(Embodiments herein provides a kind of frequency changer controller and method, air-conditioning, is related to field of refrigeration equipment, while solving the problems, such as that DC bus-bar voltage increases extremely, controls equipment cost well.The frequency changer controller is applied to air-conditioning, air-conditioning includes compressor, frequency converter, current rectifying and wave filtering circuit and controller, frequency converter is coupled with current rectifying and wave filtering circuit by the first DC bus and the second DC bus, tandem thin-film capacitor between the first DC bus and the second DC bus；Frequency changer controller, comprising: processing module, for generating pressure release pwm signal when determining power cut-off or air-conditioning shutdown, and determining that the voltage on the first DC bus is more than the first predetermined voltage threshold；Sending module, the pressure release pwm signal for generating processing module are exported to frequency converter, and frequency converter opens the upper bridge arm of at least one electric bridge according to pressure release pwm signal, and opens the lower bridge arm of at least one electric bridge in other electric bridges.For Frequency Converter Control.)

1. a kind of frequency changer controller, be applied to air-conditioning, the air-conditioning include compressor, frequency converter, current rectifying and wave filtering circuit with And controller, wherein the frequency converter and the current rectifying and wave filtering circuit pass through the first DC bus and the second DC bus coupling It closes, the AC rectification that the current rectifying and wave filtering circuit is used to export power supply passes through first DC bus and institute for direct current The second DC bus is stated to export to the frequency converter, driving pwm signal of the frequency converter for being exported in the controller Energy is exported to the compressor under control；Thin-film electro is in series between first DC bus and second DC bus Hold, second DC bus connects ground terminal, wherein the frequency changer controller is the controller itself or control Chip in device；It is characterised by comprising:

Processing module for shutting down when the determining power cut-off or the air-conditioning, and determines first DC bus On voltage be more than the first predetermined voltage threshold when, generate pressure release pwm signal；

Sending module, the pressure release pwm signal for generating the processing module are exported to the frequency converter, wherein institute It states frequency converter and opens the upper bridge arm of at least one electric bridge according to the pressure release pwm signal, and open at least one in other electric bridges The lower bridge arm of electric bridge.

2. frequency changer controller according to claim 1, which is characterized in that described device further include:

Busbar voltage hardware protection circuit, for detecting the voltage on first DC bus, by first DC bus On voltage be compared with the first predetermined voltage threshold, when determine the voltage on first DC bus be greater than described first When predetermined voltage threshold, generatrix voltage protecting signal；

The processing module protects signal true specifically for the busbar voltage generated according to the busbar voltage hardware protection circuit Voltage on fixed first DC bus is more than first predetermined voltage threshold.

3. frequency changer controller according to claim 1, which is characterized in that described device further include:

Busbar voltage sample circuit, for carrying out sampling generatrix sampled voltage to the voltage on first DC bus；

The processing module, whether the bus sampled voltage generated specifically for the determination busbar voltage sample circuit is more than institute State the first predetermined voltage threshold.

4. frequency changer controller according to claim 1, which is characterized in that described device further include:

Supply voltage sample circuit is sampled for the voltage to the power supply, generates power supply sampled voltage；

The processing module, specifically for being less than when the power supply sampled voltage for determining that the supply voltage sample circuit generates When detection threshold value, the power cut-off is determined.

5. frequency changer controller according to claim 1, which is characterized in that when the frequency converter is three phase converter When, the frequency converter includes three electric bridges, and the frequency converter opens the upper bridge arm of an electric bridge according to the pressure release pwm signal, And open the lower bridge arm of at least one electric bridge in other two electric bridges；Alternatively, the frequency converter is opened according to the pressure release pwm signal The upper bridge arm of two electric bridges is opened, and opens the lower bridge arm of other electric bridge.

6. frequency changer controller according to claim 1, which is characterized in that when the frequency converter is single-phase frequency converter When, the frequency converter includes two electric bridges, and the frequency converter opens the upper bridge arm of an electric bridge according to the pressure release pwm signal, And open the lower bridge arm of another electric bridge.

7. frequency changer controller according to claim 1, which is characterized in that the sending module is also used to, when described Processing module determines that the power cut-off or the air-conditioning are shut down, and determines that the voltage on first DC bus is more than When first predetermined voltage threshold, stop exporting the driving pwm signal to the frequency converter.

8. frequency changer controller according to claim 1, which is characterized in that the sending module is also used to, when described When processing module determines the voltage on first DC bus lower than the second predetermined voltage threshold, stop defeated to the frequency converter The pressure release pwm signal out, wherein second predetermined voltage threshold is less than first predetermined voltage threshold.

9. a kind of frequency converter control method, be applied to air-conditioning, the air-conditioning include compressor, frequency converter, current rectifying and wave filtering circuit with And controller, wherein the frequency converter and the current rectifying and wave filtering circuit pass through the first DC bus and the second DC bus coupling It closes, the AC rectification that the current rectifying and wave filtering circuit is used to export power supply passes through first DC bus and institute for direct current The second DC bus is stated to export to the frequency converter, driving pwm signal of the frequency converter for being exported in the controller Energy is exported to the compressor under control；Thin-film electro is in series between first DC bus and second DC bus Hold, second DC bus connects ground terminal；It is characterized in that, which comprises

When determining that the power cut-off or the air-conditioning shut down, and determine that the voltage on first DC bus is more than the When one predetermined voltage threshold, pressure release pwm signal is generated；

The pressure release pwm signal is exported to the frequency converter, wherein the frequency converter is opened at least according to the pwm signal The upper bridge arm of one electric bridge, and open the lower bridge arm of at least one electric bridge in other electric bridges.

10. frequency converter control method according to claim 9, which is characterized in that the method also includes:

The voltage on first DC bus is detected, by the voltage and the first predetermined voltage threshold on first DC bus It is compared, when determining that the voltage on first DC bus is greater than first predetermined voltage threshold, generatrix electricity Pressure protection signal；Signal is protected to determine that the voltage on first DC bus is more than described first pre- according to the busbar voltage If voltage threshold.

11. frequency converter control method according to claim 9, which is characterized in that the method also includes: to described first Voltage on DC bus carries out sampling generatrix sampled voltage；The bus for determining that the busbar voltage sample circuit generates is adopted Whether sample voltage is more than first predetermined voltage threshold.

12. frequency converter control method according to claim 9, which is characterized in that the method also includes:

The voltage of the power supply is sampled, power supply sampled voltage is generated, is detected when determining that the power supply sampled voltage is less than When threshold value, the power cut-off is determined.

13. frequency converter control method according to claim 9, which is characterized in that when determining the power cut-off or institute When stating air-conditioning shutdown, and determining that the voltage on first DC bus is more than first predetermined voltage threshold, stop to The frequency converter exports the driving pwm signal.

14. a kind of air-conditioning, including compressor, frequency converter, current rectifying and wave filtering circuit and controller, wherein the frequency converter with it is described Current rectifying and wave filtering circuit is coupled by the first DC bus and the second DC bus, and the current rectifying and wave filtering circuit is used for power supply is defeated AC rectification out is that direct current is exported by first DC bus and second DC bus to the frequency converter, The frequency converter is used to export energy to the compressor under the control for the driving pwm signal that the controller exports；It is described Thin-film capacitor is in series between first DC bus and second DC bus, second DC bus connects ground terminal, It is characterized by further comprising: such as the described in any item frequency changer controllers of claim 1-8, wherein the Frequency Converter Control Device is the chip in the controller itself or controller.

Technical field

The embodiment of the present invention is related to field of refrigeration equipment more particularly to a kind of frequency changer controller and method, air-conditioning.

Background technique

The working principle of existing refrigeration equipment is usually to pass through compressor to act on refrigerant realization function.In converter technique In, it is powered by frequency converter to compressor, realizes the power control of compressor.A kind of common compressor control scheme is to lead to Output to frequency converter, frequency converter is exported in its controller after the voltage that over commutation filter circuit exports power supply carries out rectifying and wave-filtering Pulse width modulation (pulse width modulation, PWM) signal control under, to compressor output power, certain Application scenarios low-converter can use intelligent power module (intelligent power module, IPM).

Usual current rectifying and wave filtering circuit is coupled by DC bus with frequency converter, is stopped when the power supply of refrigeration equipment powers off suddenly When machine or abnormal failure are instantaneously shut down, the voltage on DC bus can increase extremely, in this way can be to current rectifying and wave filtering circuit or change Device in frequency device causes to damage.It is mainly to connect in the form of on DC bus at present to avoid such case The mode of large capacity, high voltage value electrolytic capacitor or tandem thin-film capacitor.Wherein, electrolytic capacitor volume is larger, cost compared with It is high；Although thin-film capacitor can solve the big problem at high cost of volume, its capacity is limited, not can effectively solve DC bus The upper raised problem of voltage.Therefore it also can usually can also connect on DC bus for preventing DC bus-bar voltage overshoot electricity Road, for reducing DC bus-bar voltage.Certain this mode needs to redesign complicated circuit, also will increase cost.

Summary of the invention

To solve the problems, such as that direct current bus bar reduce off-flavor often increases, embodiments herein provides a kind of Frequency Converter Control dress It sets and method, air-conditioning controls equipment cost while solving the problems, such as that direct current bus bar reduce off-flavor often increases well.

In a first aspect, providing a kind of frequency changer controller, it is applied to air-conditioning, air-conditioning includes compressor, frequency converter, rectification Filter circuit and controller, wherein frequency converter and current rectifying and wave filtering circuit pass through the first DC bus and the second DC bus coupling It closes, the AC rectification that current rectifying and wave filtering circuit is used to export power supply is that direct current is female by the first DC bus and the second direct current Line is exported to frequency converter, and frequency converter is used to export energy to compressor under the control for the driving pwm signal that controller exports；The Thin-film capacitor is in series between one DC bus and the second DC bus, the second DC bus connects ground terminal, wherein frequency converter Control device is the chip in controller itself or controller；The frequency changer controller includes: processing module and transmission Module.Wherein, processing module for shutting down when determining power cut-off or air-conditioning, and determines the electricity on the first DC bus When pressure is more than the first predetermined voltage threshold, pressure release pwm signal is generated；Sending module, the pressure release PWM for generating processing module Signal is exported to the frequency converter, wherein and frequency converter opens the upper bridge arm of at least one electric bridge according to the pressure release pwm signal, And open the lower bridge arm of at least one electric bridge in other electric bridges.In this way, when being shut down due to power cut-off or air-conditioning, the first direct current There are the raised risk of electric voltage exception on bus, by determining power cut-off or air-conditioning shutdown occur for the application, and first When voltage on DC bus is more than the first predetermined voltage threshold, it can actively change the pwm signal of output to frequency converter, at this Pressure release pwm signal can be exported to frequency converter in application, so that the upper bridge arm that frequency converter will open at least one electric bridge is controlled, and The lower bridge arm for opening at least one electric bridge in other electric bridges, due to the upper bridge arm and at least one other electricity of at least one electric bridge Compressor can be connected with the first DC bus and the second DC bus for the lower bridge arm of bridge, in this way due to the second DC bus Ground terminal is connected, then the first DC bus can directly carry out energy release, often increase to solve direct current bus bar reduce off-flavor The problem of while, simultaneously because increasing only thin-film capacitor, control equipment cost well.

Second aspect provides a kind of frequency converter control method, is applied to air-conditioning, air-conditioning includes compressor, frequency converter, rectification Filter circuit and controller, wherein frequency converter and current rectifying and wave filtering circuit pass through the first DC bus and the second DC bus coupling It closes, the AC rectification that current rectifying and wave filtering circuit is used to export power supply is that direct current is female by the first DC bus and the second direct current Line is exported to frequency converter, and frequency converter is used to export energy to compressor under the control for the driving pwm signal that controller exports；The Thin-film capacitor is in series between one DC bus and the second DC bus, the second DC bus connects ground terminal；This method comprises: When determining that power cut-off or air-conditioning shut down, and determine that the voltage on the first DC bus is more than the first predetermined voltage threshold When, generate pressure release pwm signal；Pressure release pwm signal is exported to frequency converter, wherein frequency converter opens at least one according to pwm signal The upper bridge arm of a electric bridge, and open the lower bridge arm of at least one electric bridge in other electric bridges.

The third aspect provides a kind of frequency changer controller, is applied to air-conditioning, air-conditioning includes compressor, frequency converter, rectification Filter circuit and controller, wherein frequency converter and current rectifying and wave filtering circuit pass through the first DC bus and the second DC bus coupling It closes, the AC rectification that current rectifying and wave filtering circuit is used to export power supply is that direct current is female by the first DC bus and the second direct current Line is exported to frequency converter, and frequency converter is used to export energy to compressor under the control for the driving pwm signal that controller exports；The Thin-film capacitor is in series between one DC bus and the second DC bus, the second DC bus connects ground terminal, wherein frequency converter Control device is the chip in controller itself or controller；The frequency changer controller includes: processor and interface circuit, Wherein processor and interface circuit couples, processor are used to execute instruction to implement the control for the frequency converter that above-mentioned second aspect provides Method processed.

Fourth aspect provides a kind of storage medium, is stored with instruction, can be realized when instruction executes on computers The frequency converter control method of second aspect offer is provided.

5th aspect provides a kind of computer program product, and computer program product includes instruction, when instruction is in computer It can be realized the frequency converter control method that above-mentioned second aspect provides when upper execution.

6th aspect, provides a kind of air-conditioning, including compressor, frequency converter, current rectifying and wave filtering circuit and controller, wherein becoming Frequency device is coupled with current rectifying and wave filtering circuit by the first DC bus and the second DC bus, and current rectifying and wave filtering circuit is used for power supply The AC rectification of output is that direct current is exported by the first DC bus and the second DC bus to frequency converter, and frequency converter is used for Energy is exported to compressor under the control of the driving pwm signal of controller output；First DC bus and the second DC bus Between be in series with thin-film capacitor, the second DC bus connects ground terminal, air-conditioning further include: the frequency converter that above-mentioned first aspect provides Control device, wherein frequency changer controller is the chip in controller itself or controller.

Wherein second aspect to the scheme that the 6th aspect provides contains technical characteristic identical or corresponding with first aspect, The technical effect that it is realized is similar with first aspect, and which is not described herein again.

Detailed description of the invention

In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described.

Fig. 1 is a kind of schematic diagram of the converter circuit for driving compressor that the embodiment of the present invention provides；

Fig. 2 is a kind of schematic diagram of the converter circuit for driving compressor that another embodiment of the present invention provides；

Fig. 3 is a kind of schematic diagram of the converter circuit for driving compressor that another embodiment of the present invention provides；

Fig. 4 is a kind of schematic diagram of the converter circuit for driving compressor that one more embodiment of the present invention provides；

Fig. 5 is a kind of schematic diagram of the converter circuit for driving compressor that another embodiment of the present invention provides；

Fig. 6 is a kind of structural schematic diagram for frequency changer controller that the embodiment of the present invention provides；

Fig. 7 is a kind of structural schematic diagram for frequency changer controller that another embodiment of the present invention provides；

Fig. 8 is a kind of flow diagram for frequency converter control method that the embodiment of the present invention provides；

Fig. 9 is a kind of structural schematic diagram for frequency changer controller that another embodiment of the present invention provides.

Specific embodiment

Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete Site preparation description, it is clear that described embodiment is some embodiments of the present application, instead of all the embodiments.Based on this Shen Please in embodiment, every other implementation obtained by those of ordinary skill in the art without making creative efforts Example, shall fall in the protection scope of this application.The use of term " first " and " second " etc. does not indicate any sequence, can be by above-mentioned art Language is construed to the title of described object.In the embodiment of the present application, " illustrative " or " such as " etc. words for indicate make Example, illustration or explanation.Be described as in the embodiment of the present application " illustrative " or " such as " any embodiment or design Scheme is not necessarily to be construed as than other embodiments or design scheme more preferably or more advantage.Specifically, it uses " exemplary " or " such as " etc. words be intended to that related notion is presented in specific ways.

Before introducing the embodiment of the present invention, the part prior art is simply introduced first.The work of existing air-conditioning It is usually to pass through compressor to act on refrigerant realization function as principle.In converter technique, powered by frequency converter to compressor, Realize the power control of compressor.A kind of common compressor control scheme is to be exported power supply by current rectifying and wave filtering circuit Output to frequency converter, frequency converter modulates (pulse width in the pulse width that its controller exports after voltage carries out rectifying and wave-filtering Modulation, PWM) under signal control, to compressor output power, certain application scenarios low-converters can be using intelligence Power module (intelligent power module, IPM).Usual current rectifying and wave filtering circuit passes through DC bus and frequency converter coupling It closes, when the power supply of air-conditioning powers off shutdown suddenly or abnormal failure is instantaneously shut down, the voltage on DC bus can rise extremely Height can cause to damage to the device in current rectifying and wave filtering circuit or frequency converter in this way.For example, referring to shown in Fig. 1, providing the one of air-conditioning The converter circuit of kind driving compressor, specifically includes: three phase mains 11, current rectifying and wave filtering circuit 12, frequency converter 13, compressor 14 And controller 15, wherein three phase mains 11 includes u, v and w three-phase；Current rectifying and wave filtering circuit 12 includes filtering part and rectification part Point, wherein filtering part includes inductance L1, L2 and L3, and wherein L1 is connected on the u phase of three phase mains 11, and L2 is connected on three phase mains 11 v phase, L3 are connected on the w phase of three phase mains 11；Rectifying part includes three that diode D1, D2, D3, D4, D5, D6 are constituted Rectifier bridge, wherein D1 and D2 is connected between the first DC bus l1 and the second DC bus l2, and the anode connection second of D2 is straight Bus l2, the anode of the cathode connection D1 of D2 are flowed, the cathode of D1 connects the first DC bus l1；Similar, wherein D3 and D4 goes here and there It is associated between the first DC bus l1 and the second DC bus l2, D5 and D6 are connected on the first DC bus l1 and the second direct current mother Between line l2, the second DC bus l2 connection ground terminal GND, the voltage on the first DC bus is Vdc.Wherein, L1 specifically goes here and there It being associated between the anode of D1 and the u phase of three phase mains 11, L2 is specifically connected between the anode of D3 and the v phase of three phase mains 11, L3 is specifically connected between the anode of D5 and the w phase of three phase mains 11.Wherein frequency converter 13 and current rectifying and wave filtering circuit 12 pass through the One DC bus l1 and the second DC bus l2 coupling, frequency converter 13 include six insulated gate bipolar transistor (insulated Gate bipolar transistor, IGBT) M1-M6 constitute three electric bridges, wherein the emitter (e) of each IGBT and collection Diode, the anode of the emitter connection D7 of illustrative M1, the yin of the collector connection D7 of M1 are in series between electrode (c) Pole, similar D8 are connected between the emitter (e) of M2 and collector (c), and D9 is connected on the emitter (e) and collector of M3 (c) between, D10 is connected between the emitter (e) of M4 and collector (c), and D11 is connected on the emitter (e) and collector of M5 (c) between, D12 is connected between the emitter (e) of M6 and collector (c).In addition, M1 and M2 are connected on the first DC bus l1 And second form the first electric bridge between DC bus l2, the collector of M1 is connect with the first DC bus l1, the emitter of M1 with The collector of M2 connects, and the emitter of M2 is connect with the second DC bus l2.Similar M3 and M4 is connected on the first DC bus The second electric bridge is formed between l1 and the second DC bus l2, M5 and M6 are connected on the first DC bus l1 and the second DC bus l2 Between formed third electric bridge.Wherein the first electric bridge includes upper bridge arm and lower bridge arm, wherein the M1 on upper bridge arm is defeated in its base stage (b) When being connected under the control of the pwm signal entered, it is believed that upper bridge arm is opened, with should the M2 in its lower bridge arm inputted in its base stage (b) Pwm signal control under when being connected, it is believed that lower bridge arm is opened, and the working principle of other two electric bridges is similar.Compressor 14 wraps Three input ports U, V, W are included, wherein the emitter of input port U connection M1, the emitter of input port V connection M3, input The emitter of port W connection M5.Wherein, controller 15 connects the base stage (b) of M1, M2, M3, M4, M5, M6, and frequency converter 13 is used for Energy is exported to compressor 14 under the control for the driving pwm signal that controller 15 exports, wherein driving pwm signal includes difference The six road pwm signals of corresponding six IGBT, certainly in certain schemes, the base stage of IGBT is also referred to as grid (g), emitter (e) Also referred to as source electrode (s), collector also referred to as drain (d).In addition, controller 15 can use central processing unit (central Processing unit, CPU), microprocessor or micro-control unit (microcontroller unit, MCU), scene can compile The logic processing circuit of the forms such as journey gate array (field-programmable gate array, FPGA), in addition Fig. 1 is shown Circuit on can also include other peripheral cells, such as the first DC bus on inductance L4 can be set.In circuit as above In, when power supply 11 suddenly instantaneously shut down by power-off or abnormal failure, the driving pwm signal of controller 15 stops output, compression 14 moment of machine stops, and the energy of 14 coil of compressor is built-in by the upper bridge IGBT (M1, M3, M5) of three electric appliances of frequency converter 13 Diode (D7, D9, D11) forming circuit, flow to the first DC bus l1, the voltage 11 of the first DC bus caused to increase, To cause frequency converter 13 and current rectifying and wave filtering circuit 12 to damage.

It is mainly the large capacity in parallel on DC bus in the form of, referring to Fig. 2 at present to avoid above situation Shown, it is female in the first DC bus l1 and the second direct current for providing a kind of difference of converter circuit and Fig. 1 for driving compressor Series connection electrolysis capacitor between line l2 shows two electrolytic capacitors C1, C2 in Fig. 2, naturally it is also possible to be that series connection is more or fewer Electrolytic capacitor.In this way, can be very good to absorb release to the first direct current mother due to the characteristic of electrolytic capacitor large capacity high voltage value The energy of line l1 avoids the first DC bus-bar voltage from increasing, however the volume of electrolytic capacitor is relatively large, higher cost.Therefore In another scheme, as shown in figure 3, electrolytic capacitor is replaced with thin-film capacitor, the first DC bus is wherein shown in Fig. 3 Concatenated thin-film capacitor C3 between l1 and the second DC bus l2.Although however the reduction of thin-film capacitor advantage of lower cost volume is bright It is aobvious, but the capacity of thin-film capacitor is smaller, the finite energy that can be absorbed, can not the first DC bus of very good solution electricity The problem of pressure increases.

Therefore, technical staff also has the mode for increasing anti-busbar voltage overshoot circuit on the basis of Fig. 3 to avoid first straight It is excessively high to flow busbar voltage, as shown in figure 4, in a kind of example, anti-busbar voltage overshoot circuit include resistance R1, diode D13, Switching tube Q1, wherein R1 is in parallel with D13, and the anode of first end connection D13 of R1, the second end of R1 connect the cathode of D13；D13 Cathode connect the first DC bus l1, D13 anode connection Q1 collector c, Q1 emitter e connect the second DC bus The base stage b connection controller 15 of l2, Q1, when controller 15 determines that power supply 11 powers off suddenly or abnormal failure is instantaneously shut down Q1 is opened, is absorbed so that energy overshoots circuit by anti-busbar voltage, avoids the problem that the voltage of the first DC bus increases.In In scheme shown in fig. 5, anti-busbar voltage overshoot circuit can also be formed in series and parallel by resistance and capacitor, such as anti-busbar voltage Overshoot circuit includes diode D14, electrolytic capacitor C4, C5 of resistance R2, R3, R4 and low capacity, wherein the anode connection of D14 Connect R2, R3, R4 between the cathode of first DC bus l1, D14 and the second DC bus l2；Wherein C4 is in parallel with R3, C5 with R4 is in parallel.Although the anti-busbar voltage shown in certain Fig. 4, Fig. 5 overshoots circuit, can be good at reducing DC bus-bar voltage, It is that this mode needs to redesign complicated circuit, also will increase cost.

It as shown in Figure 3 include: air-conditioning include compressor in view of the above-mentioned problems, embodiments herein provides a kind of air-conditioning 14, frequency converter 13, current rectifying and wave filtering circuit 12 and controller 15, frequency converter 13 and current rectifying and wave filtering circuit 12 are female by the first direct current Line l1 and the second DC bus l2 coupling, tandem thin-film capacitor C3 between the first DC bus l1 and the second DC bus l2, tool Body function is as described above, details are not described herein again.In addition, additionally providing the frequency converter in air-conditioning referring to Fig. 6 embodiments herein Control device, the frequency changer controller are the chip in controller 15 itself or controller 15；It include: 61 He of processing module Sending module 62；

Processing module 61 for shutting down when the determining power-off of power supply 11 or air-conditioning, and determines l1 on the first DC bus Voltage be more than the first predetermined voltage threshold when, generate pressure release pwm signal；

Sending module 62, the pressure release pwm signal for generating processing module 61 are exported to frequency converter 13, wherein frequency conversion Device 13 opens the upper bridge arm of at least one electric bridge according to pressure release pwm signal, and opens in other electric bridges under at least one electric bridge Bridge arm.

In this way, when being shut down due to power cut-off or air-conditioning, there are the raised risk of electric voltage exception on the first DC bus, The application is by determining that power cut-off or air-conditioning, which occurs, shuts down, and the voltage on the first DC bus is more than the first default electricity It when pressing threshold value, can actively change the pwm signal of output to frequency converter, pressure release PWM can be exported to frequency converter in this application Signal so that the upper bridge arm of at least one electric bridge will be opened by controlling frequency converter, and opens at least one electric bridge in other electric bridges The lower bridge arm of lower bridge arm, upper bridge arm and at least one other electric bridge due at least one electric bridge can be by compressor and first DC bus and the conducting of the second DC bus, in this way since the second DC bus connects ground terminal, then the first DC bus can Directly to carry out energy release, thus while solving the problems, such as that direct current bus bar reduce off-flavor often increases, simultaneously because only increasing Thin-film capacitor, controls equipment cost well.

In addition, in order to realize the detection to the voltage of l1 on the first DC bus, referring to shown in Fig. 6, the implementation of the application The frequency changer controller that example provides further include: busbar voltage hardware protection circuit 63, for detecting l1 on the first DC bus Voltage, the voltage of l1 on the first DC bus is compared with the first predetermined voltage threshold, when determining the first DC bus When the voltage of upper l1 is greater than the first predetermined voltage threshold, generatrix voltage protecting signal；Processing module 61 is specifically used for basis The busbar voltage protection signal that busbar voltage hardware protection circuit 63 generates determines that the voltage on the first DC bus l1 is more than the One predetermined voltage threshold.

Embodiments herein also provides another detection mode to the voltage of l1 on the first DC bus, referring to Fig. 6 Frequency changer controller shown, that embodiments herein provides further include: busbar voltage sample circuit 64, for straight to first Voltage on stream bus l1 carries out sampling generatrix sampled voltage；Processing module 61 is specifically used for determining busbar voltage sampling Whether the bus sampled voltage that circuit 64 generates is more than the first predetermined voltage threshold.

Embodiments herein also provides the detection mode powered off to power supply 11, referring to shown in Fig. 6, frequency changer controller Further include: supply voltage sample circuit 65 is sampled for the voltage to power supply 11, generates power supply sampled voltage；Handle mould Block 61, specifically for determining electricity when the power supply sampled voltage for determining that supply voltage sample circuit 65 generates is less than detection threshold value Source power-off.

Illustratively, the function that busbar voltage hardware protection circuit 63 can be realized by comparator, referring to shown in Fig. 7, Busbar voltage hardware protection circuit 63 includes comparator 631, wherein the forward end (+) of comparator 631 passes through resistance R5 connection the One DC bus l1, and the voltage Vdc on the first DC bus is obtained, the backward end (-) of comparator 631 is connected by resistance R6 Reference voltage end Vcc, wherein Vcc inputs the first predetermined voltage threshold, and the forward end (+) of comparator 631 is connected by resistance R7 The backward end (-) of ground terminal GND, comparator 631 connect ground terminal GND by resistance R8 connection；The output end of comparator 631 is logical R9 connection reference voltage end Vcc is crossed, such comparator 631 can be by the default electricity of the voltage Vdc and first on the first DC bus Pressure threshold value is compared, when the voltage Vdc on the first DC bus is more than that the first predetermined voltage threshold generates above-mentioned bus electricity Pressure protection signal, the signal of busbar voltage protection at this time can be an enabled high level, it is to be understood that the first DC bus On voltage Vdc be less than or equal to the first predetermined voltage threshold when comparator 631 do not export or export one not enable it is low Level.So only when processing module 61 receives above-mentioned enabled high level, determine that the voltage on the first DC bus is super Cross the first predetermined voltage threshold.

In another scheme, busbar voltage sample circuit 64 may include two resistance R10, R11, and wherein the of R10 One end is connected with the second end of R11, is coupled to processing module 61, and the second end of R10 connects the of the first DC bus l1, R11 Two ends connect ground terminal GND.

Wherein power supply 11 can be three phase mains or two-phase power supply, and the application is without limitation.As shown in figs 1 to 6, become Frequency device 13 is three phase converter, and frequency converter 13 includes three electric bridges, and frequency converter 13 opens an electric bridge according to pressure release pwm signal Upper bridge arm, and open the lower bridge arm of at least one electric bridge in other two electric bridges；Alternatively, frequency converter is opened according to pressure release pwm signal The upper bridge arm of two electric bridges is opened, and opens the lower bridge arm of other electric bridge.Such as: frequency converter 13 is opened according to pressure release pwm signal The upper bridge arm of the first electric bridge is opened, the lower bridge arm of the second electric bridge, third electric bridge is opened；Or second is opened according to pressure release pwm signal The upper bridge arm of electric bridge opens the lower bridge arm of the first electric bridge, third electric bridge；Or third electric bridge is opened according to pressure release pwm signal Upper bridge arm opens the lower bridge arm of the first electric bridge, the second electric bridge；Or the first electric bridge, third electric bridge are opened according to pressure release pwm signal Upper bridge arm, open the second electric bridge lower bridge arm；Or the upper bridge of the second electric bridge, third electric bridge is opened according to pressure release pwm signal Arm opens the lower bridge arm of the first electric bridge；Or the upper bridge arm of the first electric bridge, the second electric bridge is opened according to pressure release pwm signal, it opens The lower bridge arm of third electric bridge；Or the upper bridge arm of third electric bridge is opened according to pressure release pwm signal, open the lower bridge of the first electric bridge Arm；Or the upper bridge arm of third electric bridge is opened according to pressure release pwm signal, open the lower bridge arm of the second electric bridge；Or according to pressure release Pwm signal opens the upper bridge arm of the second electric bridge, opens the lower bridge arm of the first electric bridge；Or second is opened according to pressure release pwm signal The upper bridge arm of electric bridge opens the lower bridge arm of third electric bridge；Or the upper bridge arm of the first electric bridge is opened according to pressure release pwm signal, it opens Open the lower bridge arm of the second electric bridge；Or the upper bridge arm of the first electric bridge is opened according to pressure release pwm signal, open the lower bridge of third electric bridge Arm.

Frequency converter 13 is or single-phase frequency converter, such frequency converter 13 include two electric bridges, and frequency converter 13 is according to letting out It presses pwm signal to open the upper bridge arm of an electric bridge, and opens the lower bridge arm in another electric bridge.

It is more than first default of course for the voltage realized on power cut-off or air-conditioning shutdown and DC bus Pressure release pwm signal can be exported to frequency converter when voltage threshold, need to stop driving pwm signal, then sending module 62 It is also used to, when processing module 61 determines the power-off of power supply 11 or air-conditioning shutdown, and the voltage on determining first DC bus l1 When more than the first predetermined voltage threshold, stop to 13 output driving pwm signal of frequency converter.

Furthermore when the voltage on the first DC bus restores to allowed band, the scheme of embodiments herein offer It can also stop exporting pressure release pwm signal to frequency converter, specifically, sending module 62 is also used to, when processing module 61 determines the When voltage on one DC bus l1 is lower than the second predetermined voltage threshold, stop exporting pressure release pwm signal to frequency converter 13, wherein Second predetermined voltage threshold is less than the first predetermined voltage threshold.

Referring to shown in Fig. 8, the embodiment of the present invention also provides a kind of frequency converter control method, is applied to air-conditioning, the air-conditioning For the structure specifically included referring to shown in Fig. 3, which is not described herein again, specifically comprises the following steps:

801, when determining that power cut-off or air-conditioning shut down, and determine that the voltage on the first DC bus is more than first in advance If when voltage threshold, generating pressure release pwm signal.

It further include the method for determining the voltage of the first DC bus, such as can be with are as follows: detection first before step 801 Voltage on first DC bus is compared by the voltage on DC bus with the first predetermined voltage threshold, when determining first When voltage on DC bus is greater than the first predetermined voltage threshold, generatrix voltage protecting signal；It is protected according to busbar voltage Signal determines that the voltage on the first DC bus is more than the first predetermined voltage threshold；Alternatively, to the voltage on the first DC bus Carry out sampling generatrix sampled voltage；Determine whether the bus sampled voltage that busbar voltage sample circuit generates is pre- more than first If voltage threshold.

In addition, further include the method for determining power cut-off before step 801, such as: the voltage of power supply is adopted Sample generates power supply sampled voltage, when determining that power supply sampled voltage is less than detection threshold value, determines power cut-off.

802, pressure release pwm signal is exported to frequency converter, wherein frequency converter opens at least one electric bridge according to pwm signal Upper bridge arm, and open the lower bridge arm of at least one electric bridge in other electric bridges.

The technical issues of frequency converter control method is can solve, and the technical effect realized are referred to above-mentioned frequency conversion The description of device control device, details are not described herein again.

In another scheme, the processing module 61 of above-mentioned frequency-converting control device can use one or more processor It realizes, sending module 62 can be realized using interface circuit；Now referring to a kind of frequency changer controller shown in Fig. 9, is provided, answer For air-conditioning, air-conditioning includes compressor, frequency converter, current rectifying and wave filtering circuit and controller, wherein frequency converter and rectifying and wave-filtering electricity Road is coupled by the first DC bus and the second DC bus, and current rectifying and wave filtering circuit is used for the AC rectification for exporting power supply It is exported by the first DC bus and the second DC bus to frequency converter for direct current, frequency converter is used for the drive exported in controller Energy is exported to compressor under the control of dynamic pwm signal；Thin-film electro is in series between first DC bus and the second DC bus Hold, the second DC bus connects ground terminal, and wherein frequency changer controller is the chip in controller itself or controller；It should Frequency changer controller includes: the coupling of processor 91 and interface circuit 92, wherein processor 91 and interface circuit 92, processor 91 Implement the control method of above-mentioned frequency converter for executing instruction.Illustrative interface circuit 91, processor 91 can be by total Line 93 couples.

Processor 91 can be a general central processor (central processing unit, CPU), controller MCU, application-specific integrated circuit (application-specific integrated circuit, ASIC) or one or more A integrated circuit executed for controlling application scheme program.

Certainly, the computer program of control method for executing frequency converter or depositing for instruction can also be integrated on processor 91 Storage device, or storage device can also be separately provided, such as shown in Figure 9, memory 94 is separately provided.Memory 94 can be read-only memory (read-only memory, ROM) or can store the other kinds of quiet of static information and instruction State store equipment, random access memory (random access memory, RAM) or can store information and instruction other The dynamic memory of type is also possible to Electrically Erasable Programmable Read-Only Memory (electrically erasable Programmable read-only memory, EEPROM), CD-ROM (compact disc read-only memory, CD-ROM) or other optical disc storages, optical disc storage (including compression optical disc, laser disc, optical disc, Digital Versatile Disc, Blu-ray Disc Deng), magnetic disk storage medium or other magnetic storage apparatus or can be used in carrying or storing that there is instruction or data structure shape The desired program code of formula and can by any other medium of computer access, but not limited to this.

Interface circuit 92 is used to support the interaction of processor 91 Yu other devices, such as sends pressure release PWM to frequency converter 13 Signal.Or work as the frequency-converting control device further include: busbar voltage hardware protection circuit 95, busbar voltage sample circuit 96, electricity When the voltage sampling circuit 97 of source, interface circuit 92 is for receiving busbar voltage hardware protection circuit 95, busbar voltage sample circuit 96, the signal that supply voltage sample circuit 97 is sent, wherein the function Yu structure of busbar voltage hardware protection circuit 95 are referring to figure 6, the busbar voltage hardware protection circuit 63 in Fig. 7, the function and structure of busbar voltage sample circuit 96 are referring in Fig. 6, Fig. 7 Busbar voltage sample circuit 64, the function and structure of supply voltage sample circuit 97 are sampled referring to the supply voltage in Fig. 6, Fig. 7 Which is not described herein again for circuit 65.

The embodiment of the present invention also provides a kind of storage medium, is stored with instruction, can when instruction executes on computers Realize the frequency converter control method that above-mentioned second aspect provides.

The embodiment of the present invention also provides a kind of computer program product, and computer program product includes instruction, when instruction exists It can be realized the frequency converter control method that above-mentioned second aspect provides when executing on computer.

It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row His property includes, so that the process, method, article or the device that include a series of elements not only include those elements, and And further include other elements that are not explicitly listed, or further include for this process, method, article or device institute it is intrinsic Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do There is also other identical elements in the process, method of element, article or device.

Through the above description of the embodiments, those skilled in the art can be understood that above-described embodiment side Method can be realized by means of software and necessary general hardware platform, naturally it is also possible to by hardware, but in many cases The former is more preferably embodiment.Based on this understanding, the technical solution of the application substantially in other words does the prior art The part contributed out can be embodied in the form of software products, which is stored in a storage medium In (such as ROM/RAM, magnetic disk, CD), including some instructions are used so that a terminal (can be mobile phone, computer, service Device, air conditioner or network equipment etc.) execute each embodiment of the application method.

Embodiments herein is described above in conjunction with attached drawing, but the application be not limited to it is above-mentioned specific Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art Under the enlightenment of the application, when not departing from the application objective and scope of the claimed protection, can also it make very much Form belongs within the protection of the application.