CN115622479B - Control method for exciting motor core of compressor to generate vortex heating - Google Patents
Control method for exciting motor core of compressor to generate vortex heating Download PDFInfo
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- CN115622479B CN115622479B CN202211418858.0A CN202211418858A CN115622479B CN 115622479 B CN115622479 B CN 115622479B CN 202211418858 A CN202211418858 A CN 202211418858A CN 115622479 B CN115622479 B CN 115622479B
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 48
- 238000004804 winding Methods 0.000 claims abstract description 22
- 230000000737 periodic effect Effects 0.000 claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 230000005284 excitation Effects 0.000 claims abstract description 5
- 238000010586 diagram Methods 0.000 description 11
- 239000010687 lubricating oil Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/60—Controlling or determining the temperature of the motor or of the drive
- H02P29/62—Controlling or determining the temperature of the motor or of the drive for raising the temperature of the motor
-
- 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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
- H02P27/085—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
-
- 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
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/027—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an over-current
-
- 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
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/60—Controlling or determining the temperature of the motor or of the drive
- H02P29/66—Controlling or determining the temperature of the rotor
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention discloses a control method for exciting a motor iron core of a compressor to generate vortex heating, which comprises the following steps: presetting trigger signals of all IGBT power switching tubes of a three-phase full-bridge inverter circuit; according to the trigger signal, the three-phase full-bridge inverter circuit outputs a periodic square wave voltage signal; the change time of the level of the trigger signal is changed by adjusting the on-off frequency of the power switch tube, and the change time of the level of the periodic square wave voltage signal output by the three-phase full-bridge inverter circuit is adjusted to obtain a high-frequency pulse voltage signal; the high-frequency pulse voltage signal is applied to the three-phase winding of the compressor motor to generate high-frequency excitation current, and the compressor motor iron core is excited to generate eddy current heating. The invention is used for solving the technical problems of uneven heating and low heating efficiency of the traditional vortex heating method, thereby achieving the purposes of uniform heating, improving the heating efficiency and further reducing the heating current.
Description
Technical Field
The invention relates to the technical field of variable frequency air conditioners, in particular to a control method for exciting a motor iron core of a compressor to generate vortex heating.
Background
The compressor is used as a precision electromechanical integrated device, large friction force can be generated when the compressor rotates at a high speed, special lubricating oil is needed for lubrication, the viscosity of the lubricating oil is increased along with the reduction of the temperature of the compressor, large resistance can be generated under the low temperature condition, the normal starting of the compressor is influenced, the lubrication effect is poor, and the running reliability of the compressor is further reduced.
Therefore, an electric heating belt is additionally added on the compressor to heat the lubricating oil, so that the viscosity of the lubricating oil is reduced. However, as the compressor gradually changes frequency, a winding heating technology is proposed, namely, the compressor is heated by utilizing the resistance heating of the three-phase winding of the motor of the compressor, so that an additional electric heating belt can be omitted, the cost of the compressor is reduced, and the operation reliability of the compressor is improved.
The resistance heating of the three-phase winding of the motor of the compressor has the defect that the resistance of the three-phase winding of the motor of the compressor is needed to be relied on, when the heating power is constant, the smaller the resistance is, the larger the required current is, but the maximum value of the current cannot be increased arbitrarily due to the fact that the compressor and the frequency converter have certain limitation, so that the current passing through the three-phase winding of the motor of the compressor cannot reach the required heating current, and the heating effect is finally affected. In addition, even if the required heating current can be achieved, the high current easily causes higher temperature rise of the IPM module or the IGBT power switch tube of the frequency converter, so that additional loss is brought, and the heating efficiency is lower.
In order to solve the above problems, the industry proposes the concept of eddy current heating, namely, eddy current heating generated by the motor core of the compressor, and the method is increasingly paid attention to by the industry because of low current and high efficiency. However, the existing vortex heating mainly adopts phase-missing vortex heating, and the phase-missing vortex heating only introduces current into the two-phase windings, so that the problems of uneven heating, discontinuous generated current waveform, low heating efficiency and the like can occur.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a control method for exciting a motor core of a compressor to generate vortex heating, which is used for solving the technical problems of uneven heating and low heating efficiency of the existing vortex heating method, thereby achieving the purposes of uniform heating, improving the heating efficiency and further reducing the heating current.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a control method for exciting a compressor motor core to generate eddy current heating, comprising the steps of:
presetting trigger signals of all IGBT power switching tubes of a three-phase full-bridge inverter circuit;
according to the trigger signal, the three-phase full-bridge inverter circuit outputs a periodic square wave voltage signal;
the change time of the level of the trigger signal is changed by adjusting the on-off frequency of the power switch tube, and the change time of the level of the periodic square wave voltage signal output by the three-phase full-bridge inverter circuit is adjusted to obtain a high-frequency pulse voltage signal;
and applying the high-frequency pulse voltage signal to a three-phase winding of the compressor motor to generate high-frequency excitation current, and exciting a motor iron core of the compressor to generate eddy current heating.
In a preferred embodiment of the present invention, when a trigger signal of each power switching tube of the three-phase full-bridge inverter circuit is preset, the method includes:
setting IGBT power switch tube Q 1 The level change time of the trigger signal in one period is t1 and t2;
setting IGBT power switch tube Q 2 The level change time of the trigger signal in one period is t2 and t3;
setting IGBT power switch tube Q 3 The level change time of the trigger signal in one period is t3 and t4;
setting IGBT power switch tube Q 4 The level change time of the trigger signal in one period is t4 and t5;
setting IGBT power switch tube Q 5 The level change time of the trigger signal in one period is t5 and t6;
setting IGBT power switch tube Q 6 The level change time of the trigger signal in one period is t1 and t6;
wherein the three-phase full-bridge inverter circuit comprises an IGBT power switch tube Q 1 、Q 2 、Q 3 、Q 4 、Q 5 And Q 6 Flywheel diode D 1 、D 2 、D 3 、D 4 、D 5 And D 6 The method comprises the steps of carrying out a first treatment on the surface of the The flywheel diode D 1 、D 2 、D 3 、D 4 、D 5 And D 6 Respectively with IGBT power switch tube Q 1 、Q 2 、Q 3 、Q 4 、Q 5 And Q 6 Anti-parallel, Q 1 、Q 3 And Q 5 For upper bridge switching tube, Q 4 、Q 6 And Q 2 For the lower bridge switching tube, the three-phase windings of the compressor motor are respectively connected with an IGBT power switching tube Q 1 And Q is equal to 4 、Q 3 And Q is equal to 6 、Q 5 And Q is equal to 2 Constituted U-phaseV phase and W phase bridge arm; the level change time is t1, t2, t3, t4, t5 and t6 in sequence.
As a preferred embodiment of the present invention, when the level change timing of the trigger signal is changed by adjusting the on-off frequency of the power switching tube, the method includes:
the change moments t1, t2, t3, t4, t5 and t6 are specifically shown in formula 1:
wherein f s For the on-off frequency of each IGBT power switch tube, the duty ratio thereof
By adjusting the on-off frequency f s The level change timings t1, t2, t3, t4, t5, and t6 of the trigger signal are changed.
As a preferred embodiment of the present invention, at the level change time t1, the method includes:
setting a control port of a W-phase bridge arm to be in a high-resistance state;
setting a control port of a U, V-phase bridge arm as a PWM port;
setting the value of the U-phase PWM register to 0;
setting the value of a V-phase PWM register as a set value;
jump to level change time t2.
As a preferred embodiment of the present invention, at the level change time t2, the method includes:
setting a control port of a V-th phase bridge arm to be in a high-resistance state;
setting a control port of a U, W-phase bridge arm as a PWM port;
setting the value of the U-phase PWM register to 0;
setting the value of a W-phase PWM register as a set value;
jump to level change time t3.
As a preferred embodiment of the present invention, at the level change time t3, the method includes:
setting a control port of a U-phase bridge arm to be in a high-resistance state;
setting a control port of a V, W-phase bridge arm as a PWM port;
setting the value of the V-phase PWM register to 0;
setting the value of a W-phase PWM register as a set value;
jump to level change time t4.
As a preferred embodiment of the present invention, at the level change time t4, the method includes:
setting a control port of a W-phase bridge arm to be in a high-resistance state;
setting a control port of a U, W-phase bridge arm as a PWM port;
setting the value of the V-phase PWM register to 0;
setting the value of a PWM register of the U phase as a set value;
jump to level change time t5.
As a preferred embodiment of the present invention, at the level change time t5, the method includes:
setting a control port of a V-th phase bridge arm to be in a high-resistance state;
setting a control port of a U, W-phase bridge arm as a PWM port;
setting the value of the W-phase PWM register to 0;
setting the value of a PWM register of the U phase as a set value;
jump to level change time t6.
As a preferred embodiment of the present invention, at the level change time t6, the method includes:
setting a control port of a U-phase bridge arm to be in a high-resistance state;
setting a control port of a V, W-phase bridge arm as a PWM port;
setting the value of the W-phase PWM register to 0;
setting the value of a V-phase PWM register as a set value;
jump to level change time t1.
As a preferred embodiment of the present invention, before setting the control port to the high impedance state, the method includes:
setting the on-off frequency of the IGBT power switching tube, and setting the port of the IGBT power switching tube controlled by the control chip as a PWM mode;
according to the on-off frequency of the IGBT power switch tube, the main clock frequency of the control chip and the dead time, a set value of a PWM register is obtained, and the set value is specifically shown as a formula 2:
wherein f 1 To control the master clock frequency of the chip, f s The on-off frequency of the IGBT power switch tube, t d The PWM count value corresponding to the dead time.
Compared with the prior art, the invention has the beneficial effects that:
(1) By adopting the control method provided by the invention, the traditional external PTC heating belt can be omitted, so that the cost of the compressor is reduced, and the operation reliability of the compressor is improved;
(2) Compared with a mode of heating by using the motor winding resistance of the compressor, the control method provided by the invention greatly reduces the energizing current, and effectively reduces the electric stress and loss of the power device of the frequency converter, thereby further improving the heating efficiency and the operation reliability of the compressor;
(3) Compared with the existing phase-lack vortex heating, the control method provided by the invention has the advantages that the three-phase windings are electrified, so that the compressor is uniformly heated, the generated current waveform is continuous and smaller, and the heating efficiency is improved.
The invention is described in further detail below with reference to the drawings and the detailed description.
Drawings
FIG. 1-is a topology diagram of a three-phase full-bridge inverter circuit according to an embodiment of the present invention;
FIG. 2-is a timing diagram of the application of high frequency pulse voltages in accordance with an embodiment of the present invention;
FIG. 3 is a waveform diagram of three phase winding currents of a compressor motor after application of a high frequency pulse voltage in accordance with an embodiment of the present invention;
FIG. 4 is a program flow diagram of level change time t1 according to an embodiment of the present invention;
FIG. 5 is a program flow diagram of level change time t2 according to an embodiment of the present invention;
FIG. 6-is a program flow diagram of level change time t3 according to an embodiment of the present invention;
FIG. 7 is a program flow diagram of level change time t4 according to an embodiment of the present invention;
FIG. 8 is a program flow diagram of level change time t5 according to an embodiment of the present invention;
FIG. 9 is a program flow diagram of level change time t6 according to an embodiment of the present invention;
FIG. 10 is a step diagram of a control method for exciting a compressor motor core to generate vortex heating in accordance with an embodiment of the present invention.
Detailed Description
The control method for exciting the motor core of the compressor to generate vortex heating provided by the invention, as shown in fig. 10, comprises the following steps:
step S1: presetting trigger signals of all IGBT power switching tubes of a three-phase full-bridge inverter circuit;
step S2: according to the trigger signal, the three-phase full-bridge inverter circuit outputs a periodic square wave voltage signal;
step S3: the change time of the level of the trigger signal is changed by adjusting the on-off frequency of the power switch tube, and the change time of the level of the periodic square wave voltage signal output by the three-phase full-bridge inverter circuit is adjusted to obtain a high-frequency pulse voltage signal;
step S4: the high-frequency pulse voltage signal is applied to the three-phase winding of the compressor motor to generate high-frequency excitation current, and the compressor motor iron core is excited to generate eddy current heating.
In the step S1, when the trigger signal of each power switch tube of the three-phase full-bridge inverter circuit is preset, the method includes:
setting IGBT power switch tube Q 1 The level change time of the trigger signal in one period is t1 andt2；
setting IGBT power switch tube Q 2 The level change time of the trigger signal in one period is t2 and t3;
setting IGBT power switch tube Q 3 The level change time of the trigger signal in one period is t3 and t4;
setting IGBT power switch tube Q 4 The level change time of the trigger signal in one period is t4 and t5;
setting IGBT power switch tube Q 5 The level change time of the trigger signal in one period is t5 and t6;
setting IGBT power switch tube Q 6 The level change time of the trigger signal in one period is t1 and t6;
the three-phase full-bridge inverter circuit, as shown in fig. 1, comprises an IGBT power switch tube Q 1 、Q 2 、Q 3 、Q 4 、Q 5 And Q 6 Flywheel diode D 1 、D 2 、D 3 、D 4 、D 5 And D 6 The method comprises the steps of carrying out a first treatment on the surface of the Freewheel diode D 1 、D 2 、D 3 、D 4 、D 5 And D 6 Respectively with IGBT power switch tube Q 1 、Q 2 、Q 3 、Q 4 、Q 5 And Q 6 Anti-parallel, Q 1 、Q 3 And Q 5 For upper bridge switching tube, Q 4 、Q 6 And Q 2 For the lower bridge switching tube, three-phase windings of the compressor motor are respectively connected with an IGBT power switching tube Q 1 And Q is equal to 4 、Q 3 And Q is equal to 6 、Q 5 And Q is equal to 2 The U phase, V phase and W phase bridge arm are formed; the level change times are t1, t2, t3, t4, t5, and t6 in order.
In the step S3, when the level change time of the trigger signal is changed by adjusting the on-off frequency of the power switch tube, the method includes:
the change moments t1, t2, t3, t4, t5 and t6 are specifically shown in formula 1:
wherein f s For the on-off frequency of each IGBT power switch tube, the duty ratio thereof
By adjusting the on-off frequency f s The level change timings t1, t2, t3, t4, t5, and t6 of the trigger signal are changed.
Specifically, the topology structure of the three-phase full-bridge inverter circuit is shown in fig. 1. As can be seen from fig. 1, the three-phase full-bridge inverter circuit is composed of six IGBT power switching tubes Q 1 ～Q 6 And six anti-parallel freewheeling diodes D 1 ～D 6 The input is direct current voltage, P is positive pole, N is negative pole, and the output is three-phase sine wave PWM voltage, and when the three-phase sine wave PWM voltage is added to the three-phase winding of the compressor motor, three-phase sine wave current is generated. In order to enable the three-phase winding of the compressor motor to generate an eddy current magnetic field and realize eddy current heating, a three-phase full-bridge inverter circuit is required to output high-frequency pulse voltage to be applied to the three-phase winding of the compressor motor so as to generate high-frequency excitation current. The timing diagram of the high-frequency pulse voltage formulated by the invention is shown in fig. 2, the conduction sequence of the six IGBT power switch tubes is 1-2-3-4-5-6, and a two-to-two conduction current conversion mode is adopted. For example, Q is turned on at time t1 6 And Q 1 Turn on Q at time t2 1 And Q 2 Turn on Q at time t3 2 And Q 3 Turn on Q at time t4 3 And Q 4 Turn on Q at time t5 4 And Q 5 Turn on Q at time t6 5 And Q 6 The current waveforms thus generated are sequentially cycled, as shown in particular in fig. 3. Wherein,f s for the on-off frequency of each IGBT power switch tube, the duty ratio thereofThe invention is realized by regulating the valveBreaking frequency f s To adjust the heating power, the heating power and the on-off frequency f s Inversely proportional.
Further, as shown in fig. 4, at the level change time t1, the method includes:
setting a control port of a W-phase bridge arm to be in a high-resistance state;
setting a control port of a U, V-phase bridge arm as a PWM port;
setting the value of the U-phase PWM register to 0;
setting the value of a V-phase PWM register as a set value;
jump to level change time t2.
Further, as shown in fig. 5, at the level change time t2, the method includes:
setting a control port of a V-th phase bridge arm to be in a high-resistance state;
setting a control port of a U, W-phase bridge arm as a PWM port;
setting the value of the U-phase PWM register to 0;
setting the value of a W-phase PWM register as a set value;
jump to level change time t3.
Further, as shown in fig. 6, at the level change time t3, the method includes:
setting a control port of a U-phase bridge arm to be in a high-resistance state;
setting a control port of a V, W-phase bridge arm as a PWM port;
setting the value of the V-phase PWM register to 0;
setting the value of a W-phase PWM register as a set value;
jump to level change time t4.
Further, as shown in fig. 7, at the level change time t4, the method includes:
setting a control port of a W-phase bridge arm to be in a high-resistance state;
setting a control port of a U, W-phase bridge arm as a PWM port;
setting the value of the V-phase PWM register to 0;
setting the value of a PWM register of the U phase as a set value;
jump to level change time t5.
Further, as shown in fig. 8, at the level change time t5, the method includes:
setting a control port of a V-th phase bridge arm to be in a high-resistance state;
setting a control port of a U, W-phase bridge arm as a PWM port;
setting the value of the W-phase PWM register to 0;
setting the value of a PWM register of the U phase as a set value;
jump to level change time t6.
Further, as shown in fig. 9, at the level change time t6, the method includes:
setting a control port of a U-phase bridge arm to be in a high-resistance state;
setting a control port of a V, W-phase bridge arm as a PWM port;
setting the value of the W-phase PWM register to 0;
setting the value of a V-phase PWM register as a set value;
jump to level change time t1.
Still further, before setting the control port to the high impedance state, the method includes:
setting the on-off frequency of an IGBT power switch tube, and setting a port of the IGBT power switch tube controlled by a control chip as a PWM mode;
according to the on-off frequency of the IGBT power switch tube, the main clock frequency of the control chip and the dead time, the set value of the PWM register is obtained, and the set value is specifically shown as a formula 2:
wherein f 1 To control the master clock frequency of the chip, f s The on-off frequency of the IGBT power switch tube, t d The PWM count value corresponding to the dead time.
Specifically, setting a register of a control chip, and setting the on-off frequency f of an IGBT power switch tube s Control chip 6-way control IGThe port of the BT power switch tube is set to be in a PWM mode, overcurrent protection interruption is turned on, and the main clock frequency of a control chip is assumed to be f 1 PWM count value corresponding to dead time is t d The high level is effective when triggering, the port output is high level when comparing action occurs, or the low level is effective when triggering, the port output is high level when comparing action occurs, and the value of the PWM timer is specifically shown as formula 3:
when the upper bridge switching tube is conducted, the set value of the comparator is 0, and when the lower bridge switching tube is conducted, the set value of the comparator is shown in formula 2.
The port is set to be in a PWM mode, and the purpose of the port is to use the protection function of the control chip to play a role in protection when a short circuit occurs in a three-way IGBT bridge arm, or a short circuit occurs between windings of a compressor, or unexpected overcurrent is generated.
Compared with the prior art, the invention has the beneficial effects that:
(1) By adopting the control method provided by the invention, the traditional external PTC heating belt can be omitted, so that the cost of the compressor is reduced, and the operation reliability of the compressor is improved;
(2) Compared with a mode of heating by using the motor winding resistance of the compressor, the control method provided by the invention greatly reduces the energizing current, and effectively reduces the electric stress and loss of the power device of the frequency converter, thereby further improving the heating efficiency and the operation reliability of the compressor;
(3) Compared with the existing phase-lack vortex heating, the control method provided by the invention has the advantages that the three-phase windings are electrified, so that the compressor is uniformly heated, the generated current waveform is continuous and smaller, and the heating efficiency is improved.
The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention are intended to be within the scope of the present invention as claimed.
Claims (8)
1. A control method for exciting a compressor motor core to generate eddy current heating, comprising the steps of:
presetting trigger signals of all IGBT power switching tubes of a three-phase full-bridge inverter circuit;
according to the trigger signal, the three-phase full-bridge inverter circuit outputs a periodic square wave voltage signal;
the change time of the level of the trigger signal is changed by adjusting the on-off frequency of the power switch tube, and the change time of the level of the periodic square wave voltage signal output by the three-phase full-bridge inverter circuit is adjusted to obtain a high-frequency pulse voltage signal;
the high-frequency pulse voltage signal is applied to a three-phase winding of a compressor motor to generate high-frequency excitation current, and an iron core of the compressor motor is excited to generate eddy current heating;
when the trigger signals of the power switch tubes of the three-phase full-bridge inverter circuit are preset, the method comprises the following steps:
setting IGBT power switch tube Q 1 The level change time of the trigger signal in one period is t1 and t2;
setting IGBT power switch tube Q 2 The level change time of the trigger signal in one period is t2 and t3;
setting IGBT power switch tube Q 3 The level change time of the trigger signal in one period is t3 and t4;
setting IGBT power switch tube Q 4 The level change time of the trigger signal in one period is t4 and t5;
setting IGBT power switch tube Q 5 The level change time of the trigger signal in one period is t5 and t6;
setting IGBT power switch tube Q 6 The level change time of the trigger signal in one period is t1 and t6;
wherein the three-phase full-bridge inverter circuit comprises an IGBT power switch tube Q 1 、Q 2 、Q 3 、Q 4 、Q 5 And Q 6 Flywheel diode D 1 、D 2 、D 3 、D 4 、D 5 And D 6 The method comprises the steps of carrying out a first treatment on the surface of the The flywheel diode D 1 、D 2 、D 3 、D 4 、D 5 And D 6 Respectively with IGBT power switch tube Q 1 、Q 2 、Q 3 、Q 4 、Q 5 And Q 6 Anti-parallel, Q 1 、Q 3 And Q 5 For upper bridge switching tube, Q 4 、Q 6 And Q 2 For the lower bridge switching tube, the three-phase windings of the compressor motor are respectively connected with an IGBT power switching tube Q 1 And Q is equal to 4 、Q 3 And Q is equal to 6 、Q 5 And Q is equal to 2 The U phase, V phase and W phase bridge arm are formed; the level change moments are t1, t2, t3, t4, t5 and t6 in sequence;
when the level change moment of the trigger signal is changed by adjusting the on-off frequency of the power switch tube, the method comprises the following steps:
the change moments t1, t2, t3, t4, t5 and t6 are specifically shown in formula 1:
wherein f s For the on-off frequency of each IGBT power switch tube, the duty ratio thereof
By adjusting the on-off frequency f s The level change timings t1, t2, t3, t4, t5, and t6 of the trigger signal are changed.
2. The control method for exciting a compressor motor core to generate eddy current heating according to claim 1, comprising, at a level change time t 1:
setting a control port of a W-phase bridge arm to be in a high-resistance state;
setting a control port of a U, V-phase bridge arm as a PWM port;
setting the value of the U-phase PWM register to 0;
setting the value of a V-phase PWM register as a set value;
jump to level change time t2.
3. The control method for exciting a compressor motor core to generate eddy current heating according to claim 1, comprising, at a level change time t 2:
setting a control port of a V-th phase bridge arm to be in a high-resistance state;
setting a control port of a U, W-phase bridge arm as a PWM port;
setting the value of the U-phase PWM register to 0;
setting the value of a W-phase PWM register as a set value;
jump to level change time t3.
4. The control method for exciting a compressor motor core to generate eddy current heating according to claim 1, comprising, at a level change time t 3:
setting a control port of a U-phase bridge arm to be in a high-resistance state;
setting a control port of a V, W-phase bridge arm as a PWM port;
setting the value of the V-phase PWM register to 0;
setting the value of a W-phase PWM register as a set value;
jump to level change time t4.
5. The control method for exciting a compressor motor core to generate eddy current heating according to claim 1, comprising, at a level change time t 4:
setting a control port of a W-phase bridge arm to be in a high-resistance state;
setting a control port of a U, W-phase bridge arm as a PWM port;
setting the value of the V-phase PWM register to 0;
setting the value of a PWM register of the U phase as a set value;
jump to level change time t5.
6. The control method for exciting a compressor motor core to generate eddy current heating according to claim 1, comprising, at a level change time t 5:
setting a control port of a V-th phase bridge arm to be in a high-resistance state;
setting a control port of a U, W-phase bridge arm as a PWM port;
setting the value of the W-phase PWM register to 0;
setting the value of a PWM register of the U phase as a set value;
jump to level change time t6.
7. The control method for exciting a compressor motor core to generate eddy current heating according to claim 1, comprising, at a level change time t 6:
setting a control port of a U-phase bridge arm to be in a high-resistance state;
setting a control port of a V, W-phase bridge arm as a PWM port;
setting the value of the W-phase PWM register to 0;
setting the value of a V-phase PWM register as a set value;
jump to level change time t1.
8. The method of any one of claims 2-7, wherein prior to setting the control port to the high impedance state, comprising:
setting the on-off frequency of the IGBT power switching tube, and setting the port of the IGBT power switching tube controlled by the control chip as a PWM mode;
according to the on-off frequency of the IGBT power switch tube, the main clock frequency of the control chip and the dead time, a set value of a PWM register is obtained, and the set value is specifically shown as a formula 2:
wherein f 1 To control the master clock frequency of the chip, f s The on-off frequency of the IGBT power switch tube, t d The PWM count value corresponding to the dead time.
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