WO2020147239A1 - Circuit de commande d'entraînement, climatiseur et dispositif de commande - Google Patents

Circuit de commande d'entraînement, climatiseur et dispositif de commande Download PDF

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Publication number
WO2020147239A1
WO2020147239A1 PCT/CN2019/088669 CN2019088669W WO2020147239A1 WO 2020147239 A1 WO2020147239 A1 WO 2020147239A1 CN 2019088669 W CN2019088669 W CN 2019088669W WO 2020147239 A1 WO2020147239 A1 WO 2020147239A1
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Prior art keywords
control circuit
bus
drive control
resistive
signal
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PCT/CN2019/088669
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English (en)
Chinese (zh)
Inventor
付兆强
黄招彬
文先仕
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广东美的制冷设备有限公司
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Application filed by 广东美的制冷设备有限公司 filed Critical 广东美的制冷设备有限公司
Priority to JP2021541136A priority Critical patent/JP7182719B2/ja
Publication of WO2020147239A1 publication Critical patent/WO2020147239A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection

Definitions

  • This application relates to the technical field of compressor control, in particular to a drive control circuit, an air conditioner, a drive control circuit, a controller, an air conditioner, a drive control circuit, and a control And a kind of air conditioner.
  • AC-DC-AC AC-DC-AC
  • inverter air conditioner controllers as shown in Figure 1, which mainly include AC power supply module 10', power filter module 12', and rectifier module 14' , Filter module 16', inverter module 18' and load 20'.
  • a larger capacity electrolytic capacitor is often used as the main filter element, as shown in Figures 2 and 3, where C2 to C7 are all electrolytic capacitors for filtering.
  • THD Total Harmonic Distortion
  • the heating of the electrolytic capacitor is large, which will reduce the efficiency of the controller and increase the difficulty of thermal management of the controller.
  • This application aims to solve at least one of the technical problems existing in the prior art or related technologies.
  • the first aspect of this application proposes a drive control circuit.
  • the second aspect of the application proposes an air conditioner.
  • the third aspect of the present application proposes a drive control circuit.
  • the fourth aspect of the present application proposes a controller.
  • the fifth aspect of the present application proposes an air conditioner.
  • the sixth aspect of the present application provides a drive control circuit.
  • the seventh aspect of the present application proposes a controller.
  • the eighth aspect of the present application proposes an air conditioner.
  • the first aspect of the present application provides a drive control circuit
  • the drive control circuit includes: an inverter bridge for outputting drive signals, the inverter bridge is connected between the high-voltage bus and the low-voltage bus; the drive control circuit It also includes: reactor, used to absorb the surge signal generated during the operation of the drive control circuit to drive the load, the reactor is connected between the grid and the load; bus capacitor, used to filter the surge signal on the bus line, bus The capacitor is connected to the bus line on the input side of the inverter bridge.
  • a reactor is provided in the drive control circuit, and the reactor is used to absorb the surge signal generated during the operation of the drive control circuit to drive the load to improve the surge resistance of the drive control circuit; among them, the reactor and the bus
  • the resonant frequency of the capacitor is fixed at Among them, L is the inductance value of the reactor, and C is the capacitance value of the bus capacitor, which can effectively prevent the situation where the resonance frequency is not fixed due to the distributed inductance and capacitance parameters.
  • the thin film capacitor is connected in parallel to the input side of the inverter bridge and connected in series between the high voltage bus and the low voltage bus. Used to filter out surge signals on the bus.
  • the production cost is effectively reduced; the life of film capacitors can reach 6,250 hours, which is much longer than the 2000 hours of ordinary electrolytic capacitors. Therefore, the life of the drive control circuit can be effectively increased.
  • the ESR Equivalent Series Resistance
  • the heat generation of the film capacitor is much smaller than that of the electrolytic capacitor, so it can also effectively avoid the problem of reduced control efficiency due to the heating of the bus capacitor. , Improve the reliability and work efficiency of the drive control circuit.
  • the drive control circuit further includes: a current-limiting circuit for limiting the charging current of the bus capacitor at the first power-on, and the current-limiting circuit is connected in series to the high-voltage bus.
  • the small-capacity film capacitor cannot absorb too much energy.
  • the current limiting circuit Take effect and limit the charging current of the bus capacitor at power-on to prevent the bus capacitor from being broken down by overcurrent.
  • the current-limiting circuit includes: a temperature-sensitive resistor, used to limit the charging current of the bus capacitor at the first power-on, the temperature-sensitive resistor is connected in series with the high-voltage bus; a relay, used to control the access of the first resistive element for limiting Current or short-circuit the first resistive element to stop current limiting, and the relay is connected in parallel at both ends of the temperature-sensitive resistor.
  • the temperature-sensitive resistor When a surge signal appears on the high-voltage bus, the temperature-sensitive resistor will limit the charging current of the bus capacitor at the first power-on, so as to ensure that the bus capacitor is not broken down. At the same time, the resistance of the temperature-sensitive resistor changes linearly with the temperature to achieve the The rising speed of the charging current is limited.
  • the relay is connected in parallel at both ends of the temperature-sensitive resistor to form a temperature-sensitive resistor with switching characteristics. When the drive control circuit is powered on for the first time, the relay is in an off state. The first temperature-sensitive resistor and the bus capacitor absorb the power from the AC power supply side. In the surge signal, after the first power-on, when the current on the high-voltage bus is not very large, the first relay is closed, thereby reducing the current limiting effect of the first temperature-sensitive resistor on the high-voltage bus.
  • the drive control circuit further includes: a first absorption circuit for absorbing the surge signal on the bus line, and the first absorption circuit is connected between the bus capacitor and the inverter bridge.
  • the first absorption circuit is set to connect to the bus capacitor and inverter. Between the bridges, the auxiliary bus capacitor is used to absorb the surge signal on the bus line on the side of the inverter bridge to prevent the bus capacitor from being broken down by the surge signal.
  • the first absorbing circuit includes: a resistive absorbing element for absorbing the surge signal, the resistive absorbing element is connected in parallel with the bus capacitor; and the first switching element is for adjusting the resistance The process in which the absorbing element absorbs the surge signal.
  • the first switching element is connected in series with the resistive absorbing element. When the first switching element is turned on, the resistive absorbing element absorbs the surge signal. When the first switching element is turned off, the resistive absorbing element stops Absorb the surge signal.
  • the first absorption circuit includes a resistive absorption element, and the resistive absorption element is used for absorbing the surge signal on the side of the bus capacitor close to the inverter bridge.
  • the first switching element is turned on, and the resistive absorption element is connected to the drive control circuit and absorbs the surge signal.
  • the resistive absorption element converts the electrical energy of the surge signal into heat energy and releases it to consume the surge signal , To prevent the bus capacitor from being broken down by the surge signal caused by replacing the film capacitor with a smaller capacitance value.
  • the first switch element is turned off, and the resistive absorption element is disconnected from the drive control circuit, so as to avoid affecting the normal electrical signal in the absorption control circuit.
  • the resistive absorption element includes: a first resistor for absorbing a surge signal, the first resistor is connected in series with the first switching element, and the resistance of the first resistor is connected to a preset bus
  • the voltage protection threshold corresponds to; and/or the resistance of the first resistor corresponds to the preset overcurrent protection threshold of the first switching element.
  • the resistive absorbing element includes a first resistor, and the first resistor is connected in series with the first switching element.
  • the first switching element When the first switching element is turned on, the first absorbing circuit is turned on, and the surge signal is absorbed by the first resistor. ;
  • the first switching element When the first switching element is turned off, the first absorption circuit is disconnected, and the first resistor no longer absorbs the electrical signal in the drive control circuit.
  • the resistance and power of the first resistor correspond to the preset bus voltage protection threshold and the preset overcurrent value of the first switching element and the absorbed power demand to ensure that the resistive absorption element absorbs the surge effect.
  • the voltage protection threshold and the current protection threshold are related to the voltage and current values that each component in the drive circuit can withstand when they are factory-calibrated.
  • the resistive absorbing element includes: a first single-phase conduction element connected in parallel with the first resistor, and the conduction direction of the first single-phase conduction element is the same as that flowing through the first resistor. The direction of current is opposite.
  • a first unidirectional conducting element is connected in parallel at both ends of the first resistor.
  • the first uniconducting element is a diode, which is used to form a self-inductance voltage release loop of the first resistor to prevent the first resistor from The self-inductance voltage generated on the first switching element affects the reliability of the first switching element.
  • the first resistor is an inductive resistor.
  • the conduction direction of the first single-phase conduction element is opposite to the direction of the current in the first resistor.
  • the drive control circuit further includes: a second absorption circuit for absorbing surge signals on the high-voltage bus and the low-voltage bus, and the second absorption circuit includes: a capacitive absorption element for absorbing For the surge signal, the capacitive absorption element is connected in parallel with the bus capacitor; the second unidirectional conduction element is used to regulate the absorption process of the surge signal by the capacitive absorption element, and the second unidirectional conduction element is connected in series with the capacitive absorption element.
  • the second absorbing circuit includes a capacitive absorbing element connected in parallel with the bus capacitor, the surge signal on the bus is absorbed by the capacitive absorbing element, and a second unidirectional conducting element connected in series with the capacitive absorbing element.
  • the capacitive absorbing element is capacitive, and the capacitive absorbing element is used to limit the absorbing process of the capacitive absorbing element to the surge signal, so that the capacitive absorbing element can only absorb the surge signal on the high-voltage bus, that is, through the unidirectional guide
  • the arrangement of the pass element distinguishes the bus capacitance from the capacitive absorption element, avoids using the capacitive absorption element as the bus capacitance, reduces the frequency of use of the capacitive absorption element, and improves the life of the second absorption circuit.
  • the capacitive absorption element includes at least one capacitor, or multiple capacitors connected in series and/or in parallel
  • the second absorption circuit further includes: a second resistor for absorbing the first capacitive element In the surge signal, the second resistor is connected in parallel with the capacitor.
  • the capacitive absorption element includes one or more capacitors for absorbing the surge signal, and the multiple capacitors are connected in series and/or in parallel with each other, and a second resistor connected in parallel with the capacitor is provided.
  • the second resistor is connected in parallel to absorb the surge signal in the capacitor, and the setting of the second resistor improves the reliability of the drive control circuit.
  • the second absorbing circuit and the first absorbing circuit can be provided at the same time or alternatively and separately.
  • the second absorbing circuit and the first absorbing circuit are connected in parallel.
  • the second absorbing circuit further includes: a current limiting resistor for limiting the current flowing through the capacitive absorbing element, and the current limiting resistor is connected in series with the capacitive absorbing element.
  • the second absorbing circuit is provided with a current limiting resistor, and the current limiting resistor is connected in series with the capacitive absorbing element to limit the current flowing through the capacitive absorbing element when it is powered on, and to limit the charging current of the capacitive absorbing element Within the specified range, prevent the capacitive absorption element from being broken down by overcurrent.
  • the drive control circuit further includes: a fourth resistor for absorbing the oscillating signal generated on the reactor, and the fourth resistor is connected in parallel with the reactor.
  • a fourth resistor is connected in parallel at both ends of the reactor to absorb the oscillating signal generated on the reactor.
  • the fourth resistor increases the damping of the system, and its resistance is less than 200 ohms.
  • the drive control circuit further includes: a sampling control circuit connected to the first switching element, the sampling control circuit is used to collect the power supply signal of the drive control circuit, and control the first switching element according to the power supply signal On or off; where the power supply signal includes the power supply signal measured by the drive control circuit and the power supply signal of the bus line.
  • a sampling circuit is provided in the drive control circuit.
  • the sampling circuit collects the power supply signal measured by the circuit and/or the power supply signal of the bus line, and controls the first switching element to be turned on according to the voltage amplitude of the power supply signal. Or cut off to control the absorbing process of the surge signal by the first absorbing circuit.
  • a second aspect of the present application provides an air conditioner, including: a motor; and the drive control circuit according to any one of the above technical solutions, the signal input end of the motor is connected to the drive control circuit, and the drive control The drive signal output by the circuit is used to drive the motor to run. Therefore, the air conditioner has all the beneficial effects of the drive control circuit described in any of the above embodiments, and will not be repeated here.
  • the third aspect of the present application provides a drive control circuit, including: an inverter bridge, the inverter bridge is used to output drive signals, the inverter bridge is connected between the high-voltage bus and the low-voltage bus; the reactor is used to absorb drive
  • the control circuit drives the surge signal generated during the operation of the load, the reactor is connected between the grid and the load; the bus capacitor, the bus capacitor is used to provide the starting voltage required by the load, and the bus capacitor is also used to absorb the surge signal ,
  • the bus capacitor is connected to the bus line on the input side of the inverter bridge; the first resistive element and the second switching element, the second switching element is configured to control the first resistive element to absorb the surge signal, the first resistive element And the second switching element are connected in series between the high-voltage bus and the low-voltage bus; the one-way conducting element or the third switching element; the first capacitive element, the one-way conducting element or the third switching element are configured to limit the first capacitance
  • the electrical component absorbs the surge signal
  • the drive control circuit includes: an inverter bridge, a bus capacitor, and a reactor.
  • the inverter bridge drives and controls the operation of the load, such as controlling the operation of the motor. Because the capacitance of the bus capacitor is low, The surge signal formed on the bus cannot be completely absorbed.
  • a reactor is set to absorb the surge signal generated during the operation of the drive control circuit to drive the load. At the same time, the power input signal is also filtered to make it come from the inverter bridge side and instantaneously. When the reactor is stopped, the continuous current surge signal of the reactor is released through the first absorption path composed of the unidirectional conducting element or the third switching element and the first capacitive element to realize the control of the surge signal and ensure the surge on the busbar.
  • the signal is absorbed, and a second absorption path composed of the first resistive element and the second switching element is also provided to absorb the surge signal.
  • the control chip controls the first resistive element according to the relationship between the bus signal and the voltage threshold Whether to absorb the surge signal, the arrangement of the first absorption path and the second absorption path improves the absorption capacity of the surge signal in the circuit, and improves the reliability of the circuit.
  • the unidirectional conduction element may have unidirectional conduction characteristics Components, such as diodes, etc.
  • it further includes: a second resistive element, the second resistive element is used to release the surge signal in the first capacitive element, and the second resistive element is connected in parallel with the first capacitive element.
  • the second resistive element is used to release the surge signal in the first capacitive element, and the second resistive element is set.
  • it further includes: a second capacitive element for absorbing a surge signal on the high-voltage bus, and the second capacitive element is connected in series with the first capacitive element.
  • a second capacitive element is connected in series with the first capacitive element to improve the surge signal absorption capacity of the high-voltage bus.
  • it further includes: a third resistive element, the third resistive element is used to release the surge signal in the second capacitive element, the third resistive element and the second capacitive element in parallel.
  • the third resistive element is used in conjunction with the second resistive element to balance the voltage across the first capacitive element and the second capacitive element.
  • the third resistive element is also used to release the surge signal on the second capacitive element, so as to improve the reliability of the drive control circuit.
  • it further includes: a fourth resistive element for limiting the current flowing to the first capacitive element and/or the second capacitive element, the fourth resistive element and the second switching element And the first capacitive element is connected in series; or the fourth resistive element, the second switching element, the first capacitive element and the second capacitive element are connected in series.
  • the convection of the fourth resistive element is used to flow to the first capacitive element and/or the second capacitive element.
  • the current of the capacitive element is limited to prevent the first capacitive element and/or the second capacitive element and the parallel resistive element from being damaged due to overcurrent, thereby improving the reliability of the drive control circuit.
  • it further includes: a first discharge element for releasing the spike voltage signal in the first resistive element, and the first discharge element is connected in parallel with the first resistive element.
  • the first discharging element by setting the first discharging element, after the first resistive element absorbs the surge signal on the high voltage bus, the first discharging element connected in parallel with the first resistive element is used to release the first resistive element On the spike voltage signal, the arrangement of the first discharging element improves the reliability of the drive control circuit.
  • the third switch element is connected to the control chip, and the control chip is used to collect the bus signal and control the third switch element to be turned on or off according to the bus signal.
  • the third switching element is provided to realize the controllability of the first absorption path, and the control chip controls the third switching element according to the relationship between the bus signal and the voltage threshold, so as to realize that the first capacitive element absorbs the surge signal control.
  • the controllability of the drive control circuit is improved, and the reliability of the drive control circuit is improved on the premise of improving the surge absorption capability.
  • the voltage threshold includes a first voltage threshold and a second voltage threshold; the control chip is specifically configured to: the bus signal is greater than or equal to the first voltage threshold and less than the second voltage threshold to control the second switching element Turn off, the third switching element is turned on; the bus signal is greater than or equal to the second voltage threshold, the second switching element and the third switching element are controlled to be turned on; the bus signal is less than the first voltage threshold, the second switching element and the third switching element are controlled Deadline.
  • the bus signal (such as the voltage signal of the high voltage bus) is compared with the first voltage threshold and the second voltage threshold, and the first capacitive element and the first resistive element are respectively controlled according to the comparison result to absorb
  • the surge signal specifically, when the voltage signal of the high-voltage bus is greater than or equal to the first voltage threshold and less than the second voltage threshold, the second switching element is controlled to be turned off and the third switching element is turned on, and the first capacitive element is used to Absorb the surge signal.
  • the second switching element and the third switching element are controlled to conduct, so as to quickly absorb the surge and avoid the Excessive voltage causes damage to the components of the drive control circuit;
  • the second switching element and the third switching element are controlled to be turned off, and then the surge signal is absorbed through the bus capacitance At the same time, the service life of the components in the first absorption path and the second absorption path is improved.
  • the drive control circuit further includes: a rectifier bridge, the rectifier bridge rectifies the AC signal and outputs it as a bus signal, and the bus signal is output to the bus capacitor, the inverter bridge and the inverter via the high voltage bus and the low voltage bus. Load, wherein the control chip controls the conduction state of the second switching element and the conduction state of the third switching element according to the AC signal.
  • the bus capacitor is a film capacitor.
  • the fourth aspect of the present application provides a controller including any one of the above-mentioned drive control circuits. Therefore, the controller has all the beneficial effects of the drive control circuit described in any one of the above-mentioned embodiments, which will not be repeated here.
  • a fifth aspect of the present application provides an air conditioner, including: a motor; and the drive control circuit according to any one of the above technical solutions, the signal input end of the motor is connected to the drive control circuit, and the drive control The drive signal output by the circuit is used to drive the motor to run. Therefore, the air conditioner has all the beneficial effects of the drive control circuit described in any of the above embodiments, and will not be repeated here.
  • the sixth aspect of the present application provides a drive control circuit, including: an inverter bridge, used to drive and control load operation, the inverter bridge is connected between the high-voltage bus and the low-voltage bus; a reactor, used to absorb the drive control circuit For the surge signal generated in the process of driving the load, the reactor is connected between the grid and the load; the bus capacitor is used to provide the starting voltage required for the load to be powered on, and the bus capacitor is also used to absorb the surge signal.
  • the bus capacitor is connected Into the bus line on the input side of the inverter bridge; the drive control circuit also includes: a resistive absorbing circuit for absorbing the surge signal on the bus line, the resistive absorbing circuit is connected in parallel with the bus capacitor; the fourth switching element is used for Control the resistive absorption circuit to absorb the surge signal.
  • the fourth switching element is connected in series with the resistive absorption circuit. When the fourth switching element is turned on, the resistive absorption circuit absorbs the surge signal. When the fourth switching element is turned off, the resistive The absorption circuit stops absorbing the surge signal.
  • the drive control circuit assists the bus capacitor to absorb the surge signal on the bus by connecting the resistive absorption circuit and the bus capacitor in parallel, and at the same time, controls the resistive absorption by connecting the fourth switching element in series with the resistive absorption circuit
  • the circuit's absorption process of surge signals Specifically, when the prototype is running normally, the maximum bus voltage will be much smaller than the bus voltage protection threshold (which can be set according to the actual situation), without the intervention of resistive absorption circuit, so the fourth switching element will not work; surge energy Mainly comes from the power input, the motor winding when the prototype fails, the AC and DC side inductance freewheeling and the motor kinetic energy.
  • the bus voltage will rise rapidly. Once the bus voltage exceeds the protection threshold, the components may be damaged.
  • the fourth switching element is turned on, resistive The absorption circuit starts to absorb the surge, and the bus voltage will drop rapidly. When the bus voltage is within a reasonable range (set according to the actual situation), the fourth switching element is turned off, and the resistive absorption circuit ends the surge absorption process at this stage.
  • the drive control circuit provided by the present application can effectively alleviate the poor absorption of the surge signal by the bus capacitor, thereby improving the stability and reliability of the bus voltage.
  • the resistive absorption circuit includes: a fifth resistive element for absorbing the surge signal, and the fifth resistive element is connected between the high-voltage bus and the low-voltage bus.
  • the resistive absorption circuit includes a fifth resistive element, and the fifth resistive element is inserted between the high-voltage bus and the low-voltage bus to absorb the surge signal on the bus.
  • the resistance of the fifth resistive element, power and bus voltage protection threshold, the overcurrent capability of the fourth switching element, and the energy absorbed are related.
  • the fifth resistive element is one or more resistors connected in series.
  • the resistance can be inductive or non-inductive, and there is no specific limitation here. By selecting the resistance model, the surge signal can be quickly absorbed and the bus voltage can be quickly reduced.
  • the fourth switching element is a power switch or a relay; the power switch or relay is used to control the absorbing process of the surge signal by the resistive absorbing circuit.
  • the fourth switching element is a power switch or a relay, but it is not limited thereto.
  • the absorption process of the surge signal by the resistive absorption circuit is controlled by a power switch or a relay.
  • the resistive absorption circuit further includes: a second discharge element for discharging the peak voltage of the fifth resistive element, and the second discharge element is connected in parallel with the fifth resistive element.
  • the resistive absorbing circuit also includes a second discharge element, which uses the second discharge element in parallel with the fifth resistive element to serve as the peak voltage release circuit of the fifth resistive element to prevent the fourth switching element from disconnecting At this time, the fifth resistive element generates a spike voltage, thereby affecting the drive control circuit or causing damage to the components.
  • the second discharging element is a unidirectional conducting element, or the second discharging element includes a uniconducting element and a resistor connected in series; The direction of current in the resistive element is opposite.
  • a single unidirectional conduction element or a series combination of a unidirectional conduction element and a resistor is used to provide a discharge loop for the peak voltage of the fifth resistive element.
  • Uni-conducting components are components with uni-conducting characteristics, such as diodes.
  • the unidirectional conducting element is a diode, and the selection of the diode is related to the inductance and resistance of the fifth resistive element.
  • the second discharge element includes: a third capacitive element for discharging the peak voltage of the fifth resistive element, and the third capacitive element is connected in parallel with the fifth resistive element .
  • the second discharge element includes a third capacitive element
  • the third capacitive element is used in parallel with the fifth resistive element as a discharge circuit for the peak voltage of the fifth resistive element.
  • the selection of the third capacitive element is related to the inductance of the fifth resistive element.
  • the capacitance of the third capacitive element is positively related to the inductance of the fifth resistive element, that is, the inductance of the fifth resistive element The smaller the capacitance, the smaller the capacitance of the third capacitive element.
  • the second discharge element further includes: a sixth resistive element for limiting the current flowing through the third capacitive element, and the sixth resistive element is connected in series with the third capacitive element .
  • the second discharge element also includes a sixth resistive element, and the sixth resistive element is connected in series with the third capacitive element to limit the current flowing through the third capacitive element and prevent the third capacitive element from being caused by Damaged by overcurrent, thereby improving circuit reliability.
  • the third capacitive element is a capacitor
  • the sixth resistive element is a resistor, that is, a series-connected RC resonance circuit is used to release the spike voltage of the fifth resistive element.
  • the selection of the second discharging element is related to the inductance and resistance of the fifth resistive element. If the inductance of the fifth resistive element is small enough to be negligible or not, for example, the fifth resistive element consists of one Or multiple non-inductive resistors connected in series, then the second discharge element may not be used, and the fifth resistive element alone can be used as the absorbing element.
  • the fifth resistive element includes: one or more resistors, and the multiple resistors are connected in series.
  • the drive control circuit further includes: a control circuit connected to the fourth switch element, the control circuit is used to collect the power supply signal of the drive control circuit, and control the fourth switch element according to the power supply signal On or off; where the power supply signal is a bus signal and an AC signal.
  • the power supply signal of the driving control circuit is collected by the control circuit, and the fourth switch element is controlled to be turned on or off according to the power supply signal, thereby controlling the resistive element's absorption process of the surge signal.
  • the power supply signal is a bus signal and/or an AC signal.
  • the AC signal is processed into a bus signal by the rectifier circuit, and both the bus signal and the AC signal can be used as a determination condition for controlling the turning on or off of the fourth switching element.
  • the bus capacitor is a film capacitor.
  • the seventh aspect of the present application proposes a controller, including: the drive control circuit as described in any one of the above technical solutions, so the air conditioner controller has all the technical effects of the drive control circuit, and will not be repeated here. .
  • An eighth aspect of the present application provides an air conditioner, including: a motor; and a drive control circuit as in any one of the above technical solutions; wherein the signal input terminal of the motor is connected to the drive control circuit, and the drive control circuit outputs the drive The signal is used to drive the motor to run, so the air conditioner has all the technical effects of the drive control circuit or the controller, and will not be repeated.
  • Figure 1 shows a schematic diagram of the AC-DC-AC topology in general conditions
  • Figure 2 shows a schematic diagram of a drive control circuit in general
  • Figure 3 shows a schematic diagram of another drive control circuit in general
  • FIG. 4 shows a schematic diagram of a drive control circuit of an embodiment of the present application
  • FIG. 5 shows a schematic diagram of a drive control circuit of another embodiment of the present application.
  • Fig. 6 shows a schematic diagram of a drive control circuit of another embodiment of the present application.
  • Figure 6.1 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • Fig. 7 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • Fig. 8 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • Fig. 9 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • Fig. 10 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 11 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • Fig. 12 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 13 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • Fig. 14 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 15 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • Fig. 16 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • Fig. 17 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 18 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • Fig. 19 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 20 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 21 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • Fig. 22 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 23 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 24 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 25 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 26 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 27 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 28 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 29 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 30 shows a schematic diagram of a topological structure of a drive control circuit of an embodiment of the present application.
  • FIG. 31 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • Fig. 32 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 33 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 34 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 35 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 36 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 37 shows a schematic diagram of the first voltage threshold and the second voltage threshold of an embodiment of the present application.
  • FIG. 38 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 39 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 40 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 41 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 42 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 43 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 44 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 45 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 46 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 47 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • FIG. 48 shows a schematic diagram of a drive control circuit according to another embodiment of the present application.
  • the drive control circuit, air conditioner, drive control circuit, controller, air conditioner, drive control circuit, controller, and air conditioner according to some embodiments of the present application are described below with reference to FIGS. 4 to 48.
  • a drive control circuit includes: an inverter bridge for outputting drive signals, and the inverter bridge is connected to the high-voltage bus and the low-voltage Between the busbars; the control circuit also includes: a reactor Ldc 2 , used to absorb the surge signal generated during the operation of the drive control circuit to drive the load, the reactor Ldc 2 is connected between the grid and the load; the bus capacitor is used to filter In addition to the surge signal on the bus line, the bus capacitor is connected to the bus line on the input side of the inverter bridge.
  • a reactor Ldc 2 is provided in the drive control circuit, and the reactor Ldc 2 is used to absorb the surge signal generated by the AC input side and the inverter bridge to improve the surge resistance of the drive control circuit; among them, The resonance frequency of the reactor Ldc 2 and the bus capacitor is fixed to Among them, L is the inductance value of the reactor Ldc 2 , and C is the capacitance value of the bus capacitor, which can effectively prevent the unfixed resonance frequency due to the distributed inductance and capacitance parameters. At the same time, choose to use a lower capacitance bus capacitor instead of the traditional electrolytic capacitor. Specifically, a thin film capacitor is selected as the bus capacitor on the bus.
  • the thin film capacitor is connected in parallel to the input side of the inverter bridge and connected in series between the high voltage bus and the low voltage bus. , Used to filter out the surge signal on the bus.
  • the production cost is effectively reduced; the life of film capacitors can reach 6,250 hours, which is much longer than the 2000 hours of ordinary electrolytic capacitors. Therefore, the life of the drive control circuit can be effectively increased.
  • the ESR Equivalent Series Resistance
  • the heat generation of the film capacitor is much smaller than that of the electrolytic capacitor, so it can also effectively avoid the problem of reduced control efficiency due to the heating of the bus capacitor. , Improve the reliability and work efficiency of the drive control circuit.
  • the capacitance of the bus capacitor is less than the preset capacity.
  • the preset capacity is calculated according to the following calculation formula:
  • C dc is the preset capacity
  • L S is the total inductance value on the DC side of the equivalent drive control circuit
  • P L is the load power of the drive control circuit
  • R S is the total resistance on the DC side of the equivalent drive control circuit
  • v dc0 It is the average value of the bus voltage. For example, take the 7P prototype as an example. According to the calculation formula, it can be determined that C dc must be greater than 840uF, the preset capacity is 840uF or more, and 1230uF is used in specific implementation.
  • the specification of the film capacitor is a single 900V, 30uF.
  • a resistor R 0 for current limiting is also provided between the reactor Ldc 2 and the rectifier bridge, and the resistor R 0 may be an ordinary resistor.
  • the drive control circuit further includes: a current-limiting circuit for limiting the charging current of the bus capacitor at the first power-on, and the current-limiting circuit is connected in series with the high-voltage bus.
  • the small-capacity film capacitor cannot absorb too much energy.
  • the current limiting circuit Take effect and limit the charging current of the bus capacitor at power-on to prevent the bus capacitor from being broken down by overcurrent.
  • the current-limiting circuit includes: a temperature-sensitive resistor, used to limit the charging current of the bus capacitor at the first power-on, the temperature-sensitive resistor is connected in series with the high-voltage bus; a relay is used to control the first The resistive element is used for current limiting or the first resistive element is short-circuited to stop the current limiting, and the relay is connected in parallel at both ends of the temperature-sensitive resistor.
  • the temperature-sensitive resistor when a surge signal occurs on the high-voltage bus, the temperature-sensitive resistor will limit the charging current of the bus capacitor at the first power-on, so as to ensure that the bus capacitor is not broken down. At the same time, the resistance of the temperature-sensitive resistor increases with temperature. The linear change limits the rising speed of the charging current.
  • the relay is connected in parallel at both ends of the temperature-sensitive resistor to form a temperature-sensitive resistor with switching characteristics. When the drive control circuit is powered on for the first time, the relay is in an off state. The first temperature-sensitive resistor and the bus capacitor absorb the power from the AC power supply side. In the surge signal, after the first power-on, when the current on the high-voltage bus is not very large, the first relay is closed, thereby reducing the current limiting effect of the first temperature-sensitive resistor on the high-voltage bus.
  • the drive control circuit further includes: a first absorption circuit for absorbing the surge signal on the bus line, the first absorption circuit is connected to the bus capacitor and Between inverter bridges.
  • the first absorption circuit is connected to the bus capacitor and the inverter. Between the bridges, the auxiliary bus capacitor is used to absorb the surge signal on the bus line on the side of the inverter bridge to prevent the bus capacitor from being broken down by the surge signal.
  • the first absorption circuit includes: a resistive absorption element for absorbing a surge signal, the resistive absorption element is connected in parallel with the bus capacitor; and a first switch The element is used to regulate the process of the resistive absorbing element absorbing the surge signal.
  • the first switching element is connected in series with the resistive absorbing element. When the first switching element is turned on, the resistive absorbing element absorbs the surge signal and the first switching element is turned off When the resistive absorption element stops absorbing the surge signal.
  • the first absorption circuit includes a resistive absorption element, and the resistive absorption element is used to absorb the surge signal on the side of the bus capacitor near the inverter bridge.
  • the first switching element is turned on, and the resistive absorption element is connected to the drive control circuit and absorbs the surge signal.
  • the resistive absorption element converts the electrical energy of the surge signal into heat energy and releases it to consume the surge signal , To prevent the bus capacitor from being broken down by the surge signal caused by replacing the film capacitor with a smaller capacitance value.
  • the first switch element is turned off, and the resistive absorption element is disconnected from the drive control circuit, so as to avoid affecting the normal electrical signal in the absorption control circuit.
  • the resistive absorption element includes: a first resistor for absorbing a surge signal; the first resistor is connected in series with the first switching element; The resistance value corresponds to the preset bus voltage protection threshold; and/or the resistance value of the first resistor corresponds to the preset overcurrent protection threshold of the first switching element.
  • the resistive absorbing element includes a first resistor, and the first resistor is connected in series with the first switching element.
  • the first switching element When the first switching element is turned on, the first absorbing circuit is turned on, and the surge signal is absorbed by the first resistor. ;
  • the first switching element When the first switching element is turned off, the first absorption circuit is disconnected, and the first resistor no longer absorbs the electrical signal in the drive control circuit.
  • the resistance of the first resistor corresponds to the preset bus voltage protection threshold and the preset overcurrent protection threshold of the first switching element, so as to ensure the surge absorption effect of the resistive absorption element.
  • the voltage protection threshold and the current protection threshold are related to the voltage and current values that each component in the drive circuit can withstand when they are factory-calibrated.
  • the resistive absorbing element when the first resistor is a non-inductive resistor, the resistive absorbing element further includes a diode connected in anti-parallel to the first resistor to form an induced voltage release loop.
  • the resistive absorbing element when the first resistor is a non-inductive resistor, the resistive absorbing element also includes a capacitor C 1 and a resistor R 1. After C 1 and R 1 are connected in series, they are connected in parallel to both ends of the first resistor. To form an induced voltage release loop.
  • the resistive absorption element includes: a first single-phase conduction element, connected in parallel with the first resistor, and the conduction direction of the first single-phase conduction element The direction of the current flowing through the first resistor is opposite.
  • a first uni-conducting element is connected in parallel at both ends of the first resistor.
  • the first uni-conducting element is a diode, which is used to form a self-inductance voltage release loop of the first resistor to prevent the first resistor
  • the self-inductance voltage generated on the first switching element affects the reliability of the first switching element.
  • the first resistor is an inductive resistor.
  • the conduction direction of the first single-phase conduction element is opposite to the direction of the current in the first resistor.
  • the drive control circuit further includes: a second absorption circuit for absorbing surge signals on the high-voltage bus and the low-voltage bus, and the second absorption circuit includes: The capacitive absorption element is used to absorb the surge signal, and the capacitive absorption element is connected in parallel with the bus capacitor; the second unidirectional conductive element is used to regulate the absorption process of the surge signal by the capacitive absorption element.
  • the absorbing elements are connected in series.
  • the second absorbing circuit includes a capacitive absorbing element connected in parallel with the bus capacitor, the surge signal on the bus is absorbed by the capacitive absorbing element, and a second unidirectional conducting element connected in series with the capacitive absorbing element.
  • the capacitive absorbing element is capacitive
  • the second capacitive absorbing element is used to limit the absorbing process of the capacitive absorbing element on the surge signal, so that the capacitive absorbing element can only absorb the surge signal on the high-voltage bus, that is, through
  • the setting of the unidirectional conductive element distinguishes the bus capacitor from the capacitive absorption element, avoids using the capacitive absorption element as a bus capacitor, reduces the frequency of use of the capacitive absorption element, and increases the life of the second absorption circuit.
  • the capacitive absorption element includes at least one capacitor, or multiple capacitors connected in series and/or in parallel
  • the second absorption circuit further includes: a second resistor, To absorb the surge signal in the first capacitive element, the second resistor is connected in parallel with the capacitor.
  • the capacitive absorption element includes one or more capacitors for absorbing surge signals, and the plurality of capacitors are connected in series and/or in parallel with each other, and a second resistor connected in parallel with the capacitor is provided.
  • the second resistor is connected in parallel to absorb the surge signal in the capacitor, and the setting of the second resistor improves the reliability of the drive control circuit.
  • the second absorbing circuit and the first absorbing circuit can be provided at the same time or alternatively and separately.
  • the second absorbing circuit and the first absorbing circuit are connected in parallel.
  • the second absorbing circuit further includes: a current limiting resistor for limiting the current flowing through the capacitive absorbing element, and the current limiting resistor is connected in series with the capacitive absorbing element .
  • the second absorbing circuit is provided with a current limiting resistor, and the current limiting resistor is connected in series with the capacitive absorbing element to limit the current flowing through the capacitive absorbing element at power-on, and to limit the charging current of the capacitive absorbing element Within the specified range, prevent the capacitive absorption element from being broken down by overcurrent.
  • the drive control circuit further includes: a fourth resistor for absorbing the oscillating signal generated on the reactor Ldc 2 , and the fourth resistor is connected in parallel with the reactor Ldc 2 .
  • a fourth resistor is connected in parallel at both ends of the reactor Ldc 2 to absorb the oscillating signal generated on the reactor Ldc 2.
  • the fourth resistor increases the system damping, and its resistance is less than 200 ohms.
  • the current limiting circuit can be set to three or two, specifically PTC 1 , PTC 2 and PTC 3 , or set PTC 1 , PTC 2 and PTC Any two of 3 , such as PTC 1 and PTC 2 , are respectively located on the three-phase or any two-phase input line at the AC input source side, specifically between the filter circuit and the rectifier bridge.
  • the relay When the power is first turned on, the relay is disconnected to The temperature-sensitive resistor is connected to the loop to limit the charging current of the bus capacitor.
  • three current limiting circuits are respectively located on the three-phase bus on the AC input source side, specifically located between the filter circuit and the rectifier bridge, at the first power-on, the relay is disconnected so that the temperature-sensitive resistor is connected to the loop, thereby limiting the charging current of the bus capacitor.
  • a first absorption circuit is provided in the drive control circuit.
  • three current limiting circuits are respectively located on the three-phase bus on the AC input source side , which is specifically located between the filter circuit and the rectifier bridge.
  • the relay is disconnected so that the temperature-sensitive resistor is connected to the loop, thereby limiting the charging current of the bus capacitor.
  • the drive control circuit is provided with a first absorption circuit and a second absorption circuit.
  • the first absorption circuit is located between the bus capacitor C and the inverter bridge, and the second absorption circuit is located between the rectifier bridge and the reactor Ldc 2 ; or as shown in Figure 11, the first absorbing circuit is located between the bus capacitor C and the inverter bridge, and the second absorbing circuit is located between the reactor Ldc 2 and the bus capacitor C.
  • the current-limiting circuit is arranged on the high-voltage bus.
  • the relay When the power is first turned on, the relay is disconnected to allow the temperature-sensitive resistor to connect to the loop, thereby limiting the capacitance of the bus. recharging current.
  • the driving control circuit includes a second absorption circuit, and the surge signal is absorbed by the capacitive absorption element in the second absorption circuit.
  • the current limiting circuit is arranged on the high-voltage bus.
  • the relay is disconnected to allow the temperature-sensitive resistor to connect to the loop, thereby limiting Charging current of the bus capacitor.
  • the drive control circuit is provided with a first absorption circuit and a second absorption circuit.
  • the first absorption circuit is located between the bus capacitor C and the inverter bridge, and the second absorption circuit is located between the current limiting circuit and the reactor.
  • Ldc 2 or as shown in Figure 14, the first absorption circuit is located between the bus capacitor C and the inverter bridge, and the second absorption circuit is located between the reactor Ldc 2 and the bus capacitor C.
  • three current limiting circuits are respectively located on the three-phase bus on the AC input source side.
  • the relay is disconnected to allow the temperature-sensitive resistor to connect to the loop, thereby limiting the charging current of the bus capacitor.
  • a second absorption circuit is provided in the drive control circuit, wherein a conduction element is provided in the second absorption circuit, and the conduction element is specifically the first switching element.
  • the first switching element When the surge signal in the system is weak, the first switching element is turned off , The surge signal is absorbed through the bus capacitor; when the surge signal in the system is strong, the first switching element is closed, and the second absorption circuit is connected between the high-voltage bus and the low-voltage bus to assist in absorbing the surge signal.
  • the current limiting circuit is arranged on the high-voltage bus.
  • the relay is disconnected to allow the temperature-sensitive resistor to connect to the loop, thereby limiting the capacitance of the bus. recharging current.
  • a second absorption circuit is provided in the drive control circuit, wherein a conduction element is provided in the second absorption circuit, and the conduction element is specifically the first switching element.
  • the first switching element When the surge signal in the system is weak, the first switching element is turned off , The electrophoresis signal is absorbed through the bus capacitor; when the surge signal in the system is strong, the first switching element is closed, and the second absorption circuit is connected between the high voltage bus and the low voltage bus to assist in absorbing the surge signal.
  • the current-limiting circuit is arranged on the high-voltage bus.
  • the relay When the power is first turned on, the relay is disconnected so that the temperature-sensitive resistor is connected to the loop, thereby limiting the capacitance of the bus recharging current.
  • a first absorption circuit and a second absorption circuit are provided in the drive control circuit.
  • the first absorption circuit and the second absorption circuit are respectively located on both sides of the bus capacitor.
  • the second absorption circuit is provided with a conduction element, specifically the first absorption circuit.
  • the first switching element is also provided in the first absorption circuit.
  • the first switching element of the first absorption circuit and the second absorption circuit are disconnected, and the electrophoretic signal is absorbed through the bus capacitance ;
  • the corresponding first switching element is controlled to close, so that the first absorption circuit and/or the second absorption circuit are connected between the high-voltage bus and the low-voltage bus to assist in absorbing the surge signal.
  • three current limiting circuits are respectively located on the three-phase bus on the AC input source side.
  • the relay is disconnected to allow the temperature-sensitive resistor to connect to the loop, thereby limiting the charging current of the bus capacitor.
  • a first absorption circuit and a second absorption circuit are provided in the drive control circuit.
  • the first absorption circuit and the second absorption circuit are respectively located on both sides of the bus capacitor.
  • the second absorption circuit is provided with a conduction element, specifically the first absorption circuit.
  • the first switching element is also provided in the first absorption circuit.
  • the first switching element of the first absorption circuit and the second absorption circuit are disconnected, and the electrophoretic signal is absorbed through the bus capacitance ;
  • the corresponding first switching element is controlled to close, so that the first absorption circuit and/or the second absorption circuit are connected between the high-voltage bus and the low-voltage bus to assist in absorbing the surge signal.
  • three current limiting circuits are respectively located on the three-phase bus on the AC input source side.
  • the relay is disconnected to allow the temperature-sensitive resistor to connect to the loop, thereby limiting the charging current of the bus capacitor.
  • the drive control circuit is provided with a first absorption circuit and a second absorption circuit. The first absorption circuit and the second absorption circuit are respectively located on both sides of the bus capacitor.
  • the second absorption circuit is provided with a conductive element, specifically a diode, In this way, the surge signal on the bus can enter the second absorption circuit through the diode, and the discharge current of the capacitive absorption element on the second absorption circuit is cut off by the diode, which will not affect the electrical signal on the bus.
  • a fourth resistor R 4 is connected in parallel to the reactor Ldc 2 to reduce the oscillating signal between the reactor Ldc 2 and the bus capacitor, and prevent system fluctuations caused by the LC oscillation effect between the reactor Ldc 2 and the bus capacitor. To improve system stability.
  • the current-limiting circuit is arranged on the high-voltage bus.
  • the relay is disconnected to allow the temperature-sensitive resistor to connect to the loop, thereby limiting the capacitance of the bus. recharging current.
  • the drive control circuit is provided with a first absorption circuit and a second absorption circuit. The first absorption circuit and the second absorption circuit are respectively located on both sides of the bus capacitor.
  • the second absorption circuit is provided with a conductive element, specifically a diode, In this way, the surge signal on the bus can enter the second absorption circuit through the diode, and the discharge current of the capacitive absorption element on the second absorption circuit is cut off by the diode, which will not affect the electrical signal on the bus.
  • a fourth resistor R 4 is connected in parallel to the reactor Ldc 2 to reduce the oscillating signal between the reactor Ldc 2 and the bus capacitor, and prevent system fluctuations caused by the LC oscillation effect between the reactor Ldc 2 and the bus capacitor. To improve system stability.
  • the drive control circuit includes a third absorption circuit, and the third absorption circuit includes a current limiting element.
  • the current limiting element can be a temperature-sensitive resistor PTC or a current-limiting resistor R, and a first switching element connected in parallel at both ends of the temperature-sensitive resistor PTC or current-limiting resistor R.
  • the surge energy mainly comes from the power input, the compressor winding when the prototype fails, the AC and DC side inductance freewheeling, and the compressor kinetic energy; when there is a surge voltage, the small-capacity film capacitor cannot absorb too much energy ,
  • the bus voltage is higher than the terminal voltage of the capacitive absorbing element (including capacitors C 2 and C 3 ) in the third absorbing circuit, the third absorbing circuit will work, and the remaining energy will flow into the bus capacitor and the third absorbing circuit.
  • the first switching element is closed, the temperature-sensitive resistor PTC or the current-limiting resistor R is short-circuited, and the surge energy can be quickly absorbed; when the power supply is disconnected or the DC bus voltage is lower than a fixed value (preferably set to 200V), the judgment is There is no current flowing in a switching element, so the first switching element is controlled to be turned off (the AC relay is used as the first switching element to determine whether there is no current flowing through the first switching element.
  • the current limiting element is located between the single-phase conduction element and the capacitive absorption element; or as shown in Figure 22, the current limiting element is located between the high-voltage bus and the single-phase conduction element; or As shown in Figure 23, the current limiting element is located between the capacitive absorption element and the low voltage bus.
  • the current-limiting resistor R1 (temperature-sensitive resistor PTC or current-limiting resistor R) can be realized by connecting two resistors R 4 and R 5 in series, wherein the two resistors R 4 and The sum of the resistance values of R 5 is equal to the resistance value of R 1 .
  • the first switching element is connected in parallel to the two ends of the resistor R4.
  • the resistors R 4 and R 5 are connected in series with the third current limiting circuit for current limiting. In the surge absorption stage after power on, they are closed.
  • the Kaiyuan element short-circuits the resistor R 4 , and at this time the resistor R 5 performs the current limiting function alone.
  • a first absorption circuit and a third absorption circuit are simultaneously provided in the drive control circuit; which includes a current limiting element, a capacitive absorption element and a unidirectional conduction
  • the current-limiting element includes current-limiting resistors R 4 and R 5 , R 5 is located between the unidirectional conduction element and the capacitive absorption element; R 4 is located between the capacitive absorption element and the low-voltage bus, and the first switching element is connected in parallel with the resistor Both ends of R 4 ; when the system is powered on, resistors R 4 and R 5 are connected in series with the third current-limiting circuit for current limiting.
  • the resistor R 5 performs the current limiting function alone.
  • a fourth absorption circuit is provided in the driving control circuit.
  • the fourth absorption circuit includes a capacitive absorption element, a resistive absorption element and a current-limiting element; the capacitive absorption element is connected in series with the current-limiting element; the capacitive absorption element includes a conduction element, an absorption capacitor, a current-limiting resistor R1 and a discharge resistor , snubber capacitor is set to two, respectively, and C 2 C 3, R 2 and R 3 are connected in parallel with both ends of the C 2, C 3, and C 2 for discharge and C 3; conducting element particularly single phase
  • the resistive absorption element includes an absorption resistance, a freewheeling circuit connected in parallel to both ends of the absorption resistance, the first switching element and a current measuring element, the freewheeling circuit preferably uses an anti-parallel diode; when the power supply When it is disconnected or the DC bus voltage is lower than a
  • the input end of the resistive element is connected between the conduction element and the current limiting resistor R1, and the output end of the resistive element is connected to the low voltage bus.
  • an input terminal connected to the resistive element limiting resistor R 1 and the capacitance between the absorber C, the output terminal of the resistive element 29 is connected to the voltage bus bar.
  • Lac refers to the actual AC inductance measurement model and the inductance of the input power line, which includes the inductance and resistance.
  • the AC side inductance used by the existing models is 25mH , 500 milliohms, the inductance value of the input power cord is less than or equal to 10mH (numerical amplification), and the resistance value is not less than 0.5 ohms (the resistance of the actual wire used is about 1.2 ohms);
  • Ldc refers to the actual DC side inductance model, which includes Inductance and resistance, the inductance value of Ldc is 4.5mH, 120 milliohms;
  • R 4 is a damping resistor, and the damping resistor R 4 is not set when the selected inductance value of Ldc is 4.5mH, and it is not available on the prototype with a capacity of 6KW Setting Ldc, or not setting R 4 ;
  • Lac and Ldc exist for EMC harmonic
  • Lac or Ldc may exist on the prototype, or Lac and Ldc can coexist.
  • both Lac and Ldc do not exist, but in order to solve the problem of high-frequency harmonics (if this problem is ignored, the Ldc inductor may not be used), one will be used at the Ldc position of the circuit topology Ldc2 with a smaller inductance value, and a small damping resistor R 4 in parallel with this smaller Ldc2 to improve system stability.
  • the drive control circuit further includes: a sampling control circuit (not shown in the figure), the sampling control circuit is used to collect the power supply signal of the drive control circuit, and control the first switching element according to the power supply signal On or off; where the power supply signal includes the power supply signal measured by the drive control circuit and the power supply signal of the bus line.
  • a sampling control circuit 20 is provided in the drive control circuit.
  • the sampling control circuit 20 collects the power supply signal according to the AC measurement of the circuit and/or the power supply signal of the bus line.
  • the voltage amplitude controls the first switching element to be turned on or off, thereby controlling the absorbing process of the surge signal by the first absorbing circuit.
  • the AC measured power supply signal is specifically an electrical signal between the AC power module 10 and the filter circuit 12.
  • the AC measured power supply signal is specifically an electrical signal between the filter circuit 12 and the rectifier bridge 14.
  • the power supply signal of the bus line includes the electrical signal between the rectifier bridge 14 and the absorption circuit 16, specifically the electrical signal between the rectifier bridge 14 and the reactor Ldc 2 .
  • the power supply signal of the bus line includes an electrical signal between the absorption circuit 16 and the inverter bridge 18.
  • an air conditioner including: a motor; and the drive control circuit according to any one of the above embodiments, the signal input terminal of the motor is connected to the drive control Circuit, the drive signal output by the drive control circuit is used to drive the motor to run. Therefore, the air conditioner has all the beneficial effects of the drive control circuit described in any of the above embodiments, and will not be repeated here.
  • a drive control circuit includes: a reactor Ldc, which is used to absorb the load generated during the operation of the drive control circuit to drive the load.
  • the reactor Ldc is connected between the power grid and the load; the bus capacitor C 1 and the bus capacitor C 1 are used to provide the starting voltage required by the load, and the bus capacitor C 1 is also used to absorb the surge signal.
  • the bus capacitor C 1 is connected to the bus line on the input side of the inverter bridge; the first resistive element R 1 and the second switching element, the second switching element is configured to control the first resistive element R 1 to absorb the surge signal,
  • the first resistive element R 1 and the second switching element are connected in series between the high-voltage bus and the low-voltage bus; the one-way conducting element or the third switching element; the first capacitive element C 2 , the one-way conducting element or the third
  • the switching element is configured to limit the first capacitive element C 2 from absorbing the surge signal on the high-voltage bus.
  • the unidirectional conducting element or the third switching element is connected in series with the first capacitive element C 2 and then connected in series between the high-voltage bus and the low-voltage bus.
  • control chip (not shown in the figure)
  • the control chip is connected to the second switching element, wherein the control chip controls the first resistive element R 1 to work according to the magnitude relationship between the voltage signal of the high-voltage bus and the
  • the drive control circuit when the unidirectional conducting element D 1 and the first capacitive element C 2 are connected in series, the drive control circuit includes: an inverter bridge, a bus capacitor C 1 , a reactor Ldc and a unidirectional conducting element D 1 , wherein the inverter bridge Drive and control the load operation, such as controlling the operation of the motor. Because the capacitance of the bus capacitor C 1 is low, the surge signal formed on the high-voltage bus cannot be completely absorbed. By setting the reactor Ldc, the drive control circuit can be used to drive the load.
  • the surge signal generated in the process further blocks the surge signal from the inverter bridge side, so that the surge signal from the inverter bridge side is composed of the unidirectional conducting element D 1 and the first capacitive element C 2
  • the first absorption path is released to realize the control of the surge signal, while ensuring that the surge signal on the bus is completely absorbed, and the second absorption path formed by the first resistive element R 1 and the second switching element is also provided to correct
  • the surge signal is absorbed.
  • the control chip controls whether the first resistive element R 1 absorbs the surge signal according to the relationship between the bus signal and the voltage threshold.
  • the arrangement of the first absorption path and the second absorption path improves the circuit
  • the surge signal absorption capability improves the reliability of the circuit.
  • the anode of the unidirectional conducting element D 1 is connected to the high-voltage bus, and the cathode of the uni conducting element D 1 is connected to the low-voltage bus via the first capacitive element C 2 is connected, wherein the unidirectional conductive element D 1 may be a single element having a conduction characteristic, such as voltage-dependent diode, the voltage threshold and the high-voltage bus.
  • the first resistive element R 1 and the second switching element include a temperature-sensitive resistor PTC 11 , a temperature-sensitive resistor PTC 12, and a temperature-sensitive resistor PTC 13 in the driving control circuit.
  • Each temperature-sensitive resistor is provided with a relay switch in parallel.
  • the drive control circuit further includes: a second resistive element R 2 , and the second resistive element R 2 is used to release the first capacitive element C 2 surge signal, a second resistive element and a first capacitive element R 2 C 2 connected in parallel.
  • the second resistive element R 2 is provided to release the surge signal in the first capacitive element C 2 .
  • the arrangement of the two resistive elements R 2 improves the reliability of the drive control circuit.
  • FIG. 32 and FIG. 33 it further includes: a second capacitive element C 3 for absorbing the surge signal on the high-voltage bus, the second capacitive element C 3 and the first The capacitive element C 2 is connected in series.
  • a second capacitive element C 3 series in the first capacitive element C 2 of the order to increase the absorption capacity of the high-voltage surge signal bus.
  • FIGS. 32 and 33 it further includes: a third resistive element R 3 , and the third resistive element R 3 is used to release the surge in the second capacitive element C 3 signal, a third resistive element R 3 C 3 connected in parallel with the second capacitive element.
  • the third resistive element R 3 is used in conjunction with the second resistive element R 2 to balance the first capacitive element C 2 and the second resistive element R 2 .
  • the voltage across the two capacitive elements C 3 and the third resistive element R 3 are also used to release the surge signal on the second capacitive element C 3 to improve the reliability of the drive control circuit.
  • it further includes: a fourth resistive element R 4 for restricting flow to the first capacitive element C 2 and/or the second capacitive element C 3
  • the fourth resistive element R 4 , the second switching element, and the first capacitive element C 2 are connected in series; or the fourth resistive element R 4 , the second switching element, the first capacitive element C 2 and the second The capacitive element C is connected in series with 3 phases.
  • the convection flow of the fourth resistive element R 4 toward the first capacitive element is used.
  • the current of the capacitive element C 2 and/or the second capacitive element C 3 is limited to prevent the first capacitive element and/or the second capacitive element and the parallel resistive element from being damaged due to overcurrent, which improves the drive control circuit Reliability.
  • a first discharge element for releasing a first resistive element R 1 is a spike voltage signal, a first resistive element and the first discharge The sex element R 1 is connected in parallel.
  • the first discharging element by setting the first discharging element, after the first resistive element R 1 absorbs the surge signal on the high voltage bus, the first discharging element connected in parallel with the first resistive element R 1 is used to release the a voltage spike signal generated in the resistive element 1 a R, a first discharge element improves the reliability of the drive control circuit.
  • the first discharge element is a diode.
  • the third switching element is connected to the control chip, and the control chip is used to collect bus signals and control the third switching element to be turned on or off according to the bus signals.
  • the third switching element is provided to realize the controllability of the first absorption path, and the control chip controls the third switching element according to the magnitude relationship between the bus signal and the voltage threshold, thereby realizing the first capacitive element C 2 to absorb the wave. Control of surge signals.
  • the controllability of the drive control circuit is improved, and the reliability of the drive control circuit is improved on the premise of improving the surge absorption capability.
  • Figure 35 is an example of the placement of the surge absorption circuit in Figure 33, Figure 28 and Figure 29 are Figure 35 can be implemented connection relationship.
  • the second switching element is controlled to be turned on or off according to whether an overcurrent current signal is collected by the current measuring element.
  • the preset voltage includes a first voltage threshold V 2 and a second voltage threshold V 1 ;
  • the control chip is specifically configured to: the voltage signal on the high-voltage bus is greater than or equal to the first When a voltage threshold V 2 is less than the second voltage threshold V 1 , the second switching element is controlled to be turned off and the third switching element is turned on; when the voltage signal of the high voltage bus is greater than or equal to the second voltage threshold V 1 , control The second switching element and the third switching element are turned on; when the voltage signal of the high-voltage bus is less than the first voltage threshold V 2 , the second switching element and the third switching element are controlled to be turned off.
  • the voltage signal of the high-voltage bus is compared with the first voltage threshold V 2 and the second voltage threshold V 1 , and the first capacitive element C 2 and the first resistive element R are respectively controlled according to the comparison result. 1.
  • the second switching element is controlled to be turned off and the third switching element is turned on, The first capacitive element C 2 is used to absorb the surge signal.
  • the second switching element and the third switching element are controlled to be turned on to achieve Quickly absorb surges to avoid damage to the components of the drive control circuit due to excessive voltage on the high-voltage bus; when the voltage signal of the high-voltage bus is less than the first voltage threshold V 2 , the second switching element and the third switching element are controlled Cut off, and then through the bus capacitance to absorb the surge signal, while improving the life of the components in the first absorption path and the second absorption path, where the first voltage threshold V 2 and the second voltage threshold V 1 according to the bus capacitance C 1 is related to the surge absorption capacity of the drive control circuit.
  • the drive control circuit further includes: a rectifier bridge, which rectifies the AC signal and outputs it as a bus signal.
  • the bus signal is output to the bus capacitor, inverter bridge and load via the high-voltage bus and the low-voltage bus.
  • the control chip controls the conduction state of the second switching element and the conduction state of the third switching element according to the AC signal.
  • control chip controls the conduction state of the second switching element and the conduction state of the third switching element according to the corresponding relationship between the AC signal and the voltage threshold, wherein the voltage threshold is set corresponding to the voltage threshold of the bus signal.
  • the resistance value of the first resistive element R 1 is related to the set bus voltage protection threshold and the over-current capability of the second switching element worth noting that the fourth resistive element R and a first capacitive element selected 4 C 2 related to the inductance of the first resistive element of R 1, if the first resistive element R 1 is non-inductive resistor, the The fourth resistive element R 4 , the first capacitive element C 2 and the first discharge element may not be used.
  • the first discharging element can be a diode, that is, discharging is performed by means of anti-parallel diodes. The selection of the anti-parallel diode is related to the inductance and resistance of the first resistive element R 1 .
  • the conducting element D 1 is a diode
  • the voltage on the first capacitive element C 2 and the second capacitive element C 3 is maintained at the maximum point of the DC bus voltage, and the first resistive element R
  • the second switching element on 1 is disconnected, and the surge energy mainly comes from the power input, the compressor winding when the prototype fails, the AC and DC side inductance freewheeling and the compressor kinetic energy; when there is a surge signal, due to the small capacity bus when the capacitor C 1 can not absorb too much energy, the surge voltage is greater than a first capacitive element C 2, and C 3 terminal voltage of the second capacitive element, a first capacitive element C 2, and a second capacitive element C 3 The remaining energy flows into the bus capacitor C 1 and the first capacitive element C 2 and the second capacitive element C 3.
  • the high-voltage bus voltage slowly rises (the first capacitive element C 2 and a second capacitive element C 3 is larger capacitance value, raising the voltage of the high voltage bus slower); when the high voltage is greater than a set value (V1 37 in the figure, can be set to 720V), a first The resistive element R 1 intervenes, and the switching element starts to conduct in the form of pulse width modulation or a fixed form; this ensures that the bus voltage is as stable as possible when the voltage on the high voltage bus appears. As the surge capacity is absorbed, the bus voltage begins to decrease. When it is lower than a certain set value (V2 in Figure 37, which can be set to 700V), the switching element is turned off.
  • V2 in Figure 37 which can be set to 700V
  • the conduction element D 1 is a switching element
  • both switching elements are disconnected.
  • the bus capacitor C 1 works, (the first capacitive element C 2 and the second capacitive element C 3 )
  • the surge energy mainly comes from the power input, the compressor winding when the prototype fails, the AC and DC side inductance freewheeling, and the compressor kinetic energy; when there is a surge voltage, the small-capacity bus capacitor C 1 (film capacitor) cannot Absorb too much energy.
  • the switching elements of the first capacitive element C 2 and the second capacitive element C 3 are closed, and the surge energy is almost all Enter the first capacitive element C 2 and the second capacitive element C 3 to absorb.
  • the bus voltage may decrease first and then slowly increase; when the voltage of the high voltage bus rises above a certain set value (as shown in Figure 37 the V1, can be set to 720V), a first resistive element R 1 intervening switching element begins to pulse width modulation or immobilized form conductive; in order to ensure the smoothest possible when the surge voltage appears in the bus voltage.
  • the bus voltage begins to decrease.
  • V2 in Figure 37 which can be set to 700V
  • Lac refers to the actual AC side inductance model and the input power line inductance, which includes inductance and resistance.
  • the reactor Ldc is connected in parallel with the fifth resistive element R 5 , which serves as a system damping resistor to improve system stability.
  • Lac and Ldc are for EMC (Electro Magnetic Compatibility, electromagnetic compatibility, which refers to the ability of a device or system to meet the requirements in its electromagnetic environment and not produce intolerable electromagnetic interference to any equipment in its environment) Harmonic requirements exist. If it is an area with harmonic requirements, there may be Lac or Ldc on the prototype, and even Lac and Ldc may coexist. For areas without harmonic requirements, both Lac and Ldc do not exist, but for high-frequency harmonic problems (if you ignore this problem, you can not use Ldc inductors), a smaller one will be used at the Ldc position of the circuit topology. Ldc2, this smaller Ldc2 is connected in parallel with a small damping resistor to improve system stability.
  • EMC Electro Magnetic Compatibility, electromagnetic compatibility, which refers to the ability of a device or system to meet the requirements in its electromagnetic environment and not produce intolerable electromagnetic interference to any equipment in its environment
  • Harmonic requirements exist. If it is an area with harmonic requirements, there may be Lac or Ldc on
  • PTC is the abbreviation of Positive Temperature Coefficient, which means positive temperature coefficient, and generally refers to semiconductor materials or components with a large positive temperature coefficient. Usually we mentioned PTC refers to positive temperature coefficient thermistor.
  • the combination of the conduction element D 1 and the second switching element ensures that the bus voltage is lower than the designed maximum voltage (such as 720V), which improves the stability of the drive control circuit and reduces the conduction element D 1 And the capacitance and resistance of the device in the path where the second switching element is located, thereby reducing the cost.
  • the designed maximum voltage such as 720V
  • a controller including any one of the above-mentioned drive control circuits. Therefore, the controller has all the beneficial effects of the drive control circuit of any one of the above-mentioned embodiments. Repeat it again.
  • an air conditioner including: a motor; and a drive control circuit as in any of the above technical solutions, the signal input of the motor is connected to the drive control circuit, and the drive control circuit outputs The drive signal is used to drive the motor to run. Therefore, the air conditioner has all the beneficial effects of the drive control circuit of any one of the above embodiments, and will not be repeated here.
  • the drive control circuit includes: an inverter bridge for driving and controlling the operation of the load, the inverter bridge is connected between the high-voltage bus and the low-voltage bus; a reactor , Used to absorb the surge signal generated during the operation of the drive control circuit to drive the load, the reactor is connected between the grid and the load; the bus capacitor is used to provide the starting voltage required for the load to be powered on, and the bus capacitor is also used to absorb For the surge signal, the bus capacitor is connected to the bus line on the input side of the inverter bridge; the drive control circuit also includes: a resistive absorption circuit for absorbing the surge signal on the bus line, and the resistive absorption circuit is connected in parallel with the bus capacitor; The fourth switching element is used to control the resistive absorption circuit absorbing the surge signal. The fourth switching element is connected in series with the resistive absorption circuit. When the fourth switching element is turned on, the resistive absorption circuit absorbs the surge signal. When the switching element is turned
  • the drive control circuit assists the bus capacitor to absorb the surge signal on the bus by connecting the resistive absorption circuit and the bus capacitor in parallel, and at the same time, controls the resistance by connecting the fourth switching element in series with the resistive absorption circuit.
  • the absorption process of the surge signal by the sexual absorption circuit Specifically, when the prototype is running normally, the maximum bus voltage will be much smaller than the bus voltage protection threshold (which can be set according to the actual situation), without the intervention of resistive absorption circuit, so the fourth switching element will not work; surge energy Mainly comes from the power input, the motor winding when the prototype fails, the AC and DC side inductance freewheeling, and the kinetic energy of the motor.
  • the small-capacity bus capacitor (such as film capacitor or small-capacity electrolytic capacitor) absorbs the surge Limited, the bus voltage will rise rapidly. Once the bus voltage exceeds the protection threshold, the components may be damaged.
  • the fourth switching element is turned on, resistive The absorption circuit starts to absorb the surge, and the bus voltage will drop rapidly. When the bus voltage is within a reasonable range (set according to the actual situation), the fourth switching element is turned off, and the resistive absorption circuit ends the surge absorption process at this stage.
  • the drive control circuit provided by the present application can effectively alleviate the poor absorption of the surge signal by the bus capacitor, thereby improving the stability and reliability of the bus voltage.
  • the resistive absorption circuit includes: a fifth resistive element for absorbing surge signals, and the fifth resistive element is connected to one of the high-voltage bus and the low-voltage bus. between.
  • the resistive absorption circuit includes a fifth resistive element, and the fifth resistive element is inserted between the high-voltage bus and the low-voltage bus to absorb the surge signal on the bus.
  • the resistance of the fifth resistive element, power and bus voltage protection threshold, the overcurrent capability of the fourth switching element, and the energy absorbed are related.
  • the fifth resistive element is one or more resistors connected in series.
  • the resistance can be inductive or non-inductive, and there is no specific limitation here. By selecting the resistance model, the surge signal can be quickly absorbed and the bus voltage can be quickly reduced.
  • the fourth switching element is a power switch or relay; the power switch or relay is used to control the absorbing process of the surge signal by the resistive absorbing circuit.
  • the fourth switching element is a power switch or a relay.
  • the fourth switch The component is a power switch.
  • the resistive absorption circuit further includes: a second discharge element configured to discharge the peak voltage of the fifth resistive element, and the second discharge element is connected in parallel with the fifth resistive element .
  • the resistive absorption circuit further includes a second discharge element, which is used in parallel with the fifth resistive element as a release circuit for the peak voltage of the fifth resistive element to prevent the fourth switching element from being disconnected At this time, the fifth resistive element generates a spike voltage, thereby affecting the drive control circuit or causing damage to the components.
  • the second discharge element is a unidirectional conducting element.
  • the second discharge element is a diode, and the diode is used to discharge the peak voltage of the fifth resistive element, and the conduction direction of the diode is opposite to the direction of current flowing through the fifth resistive element.
  • anti-parallel diodes provide a discharge circuit for the peak voltage of the fifth resistive element.
  • the selection of the diode is related to the inductance and resistance of the fifth resistive element.
  • the second discharge element is a series combination of a unidirectional conduction element and a resistor.
  • a unidirectional conduction element is an element with unidirectional conduction characteristics, such as a diode.
  • the second discharge element includes: a third capacitive element for discharging the peak voltage of the fifth resistive element, and the third capacitive element The element is connected in parallel with the fifth resistive element.
  • the second discharge element includes a third capacitive element, and the third capacitive element is connected in parallel with the fifth resistive element to serve as a discharge circuit for the peak voltage of the fifth resistive element.
  • the selection of the third capacitive element is related to the inductance of the fifth resistive element. Specifically, the capacitance of the third capacitive element is positively related to the inductance of the fifth resistive element, and the greater the inductance of the fifth resistive element is. Smaller, the smaller the capacitance of the third capacitive element.
  • the second discharge element further includes: a sixth resistive element for limiting the current flowing through the third capacitive element, and the sixth resistive element The element is connected in series with the third capacitive element.
  • the second discharge element further includes a sixth resistive element, and the sixth resistive element is connected in series with the third capacitive element to limit the current flowing through the third capacitive element.
  • the third capacitive element is a capacitor
  • the sixth resistive element is a resistor, that is, a series-connected RC resonance circuit is used to release the spike voltage of the fifth resistive element.
  • the selection of the second discharging element is related to the inductance and resistance of the fifth resistive element. If the inductance of the fifth resistive element is small enough to be negligible or not, for example, the fifth resistive element consists of one Or multiple non-inductive resistors connected in series, then the second discharge element may not be used, and the fifth resistive element alone can be used as the absorbing element.
  • the fifth resistive element includes: one or more resistors, and the multiple resistors are connected in series.
  • the drive control circuit further includes: a temperature-sensitive resistor for limiting the current on the resistive absorption circuit ,
  • the temperature-sensitive resistor is connected to the high-voltage bus.
  • the temperature-sensitive resistor By connecting the temperature-sensitive resistor to the high-voltage bus, it mainly works at the moment of power-on, limiting the instantaneous circuit on the absorption resistor, and it will be short-circuited after the charging is completed.
  • the resistance is a component with a positive temperature coefficient, it can be used instead of a temperature-sensitive resistor.
  • the drive control circuit further includes a relay, which is used to limit the temperature-sensitive resistance to the wave on the high-voltage bus. In the process of absorbing the surge signal, the relay is connected in parallel with the temperature-sensitive resistor.
  • the drive control circuit further includes a relay, and the relay is connected in parallel with the temperature-sensitive resistor to control the limiting process of the current on the resistive absorption circuit by the temperature-sensitive resistor.
  • the drive control circuit further includes a plurality of temperature-sensitive resistors for absorbing the surge signal at the power input terminal, specifically, The number of temperature-sensitive resistors is three, namely PTC 1 , PTC 2 , and PTC 3 , which are respectively set on each line of the AC three-phase three-wire.
  • the drive control circuit further includes a plurality of relays, and the number of relays corresponds to the temperature-sensitive resistor one to one.
  • the number of relays is three, and the three are connected in parallel with PTC 1 , PTC 2 , and PTC 3 respectively .
  • PTC 1 , PTC 2 , and PTC 3 respectively.
  • the position of the fourth switching element and the resistive absorbing circuit can be changed.
  • IGBT Insulated Gate Bipolar Transistor, insulated gate bipolar transistor
  • the drive control circuit further includes: a control circuit (not shown in the figure), connected to the fourth switch element, the control circuit is used to collect the power supply signal of the drive control circuit, and The fourth switching element is controlled to be turned on or off according to the power supply signal; wherein the power supply signal is a bus signal and an AC signal.
  • the power supply signal of the driving control circuit is collected by the control circuit, and the fourth switch element is controlled to be turned on or off according to the power supply signal, thereby controlling the resistive element's absorption process of the surge signal.
  • the power supply signal is a bus signal and/or an AC signal.
  • the AC signal is processed into a bus signal by the rectifier bridge, and both the bus signal and the AC signal can be used as a determination condition for controlling the turning on or off of the fourth switching element.
  • the bus signal can be obtained by collecting the voltage before the reactor after the rectifier bridge and/or the voltage before the inverter bridge after the reactor; the AC signal is the peak value of the AC input voltage and/or the voltage before the rectifier bridge.
  • a power amplifier circuit (not shown in the figure) is connected in series between the control circuit and the fourth switch element, and the control signal output by the control circuit is amplified by the power amplifier circuit, so that the control circuit can drive the fourth switch element.
  • the bus capacitor is a film capacitor.
  • Reactor Lac refers to the actual AC side inductance model and the input power line inductance, which includes inductance and resistance.
  • the existing models use AC side inductance 25mH, 500 milliohms, and the input power line inductance is less than or equal to 10mH (numerical amplification).
  • the resistance is not less than 0.5 ohms (the actual wire resistance is about 1.2 ohms);
  • Reactor refers to the actual DC side inductance model, which includes inductance and resistance, 4.5mH, 120 milliohms;
  • R 4 is the damping resistance of the system (not more than 200 ohms, 68 ohms are used on the 16KW prototype, but can not be used in practice).
  • the damping resistance R4 is not increased when the reactor is selected at 4.5mH, and there is no reactor on the 6KW prototype. Can be without R4.
  • Lac and reactors exist for EMC harmonic requirements. If it is a harmonic requirement area, there may be Lac or reactors on the prototype, and even Lac and reactors may coexist. For areas without harmonic requirements, Lac and reactors do not exist, but for high-frequency harmonic problems (if you ignore this problem, you can not use reactor inductance), a reactor will be used at the location of the circuit topology.
  • the smaller reactor Ldc for cost reasons, preferably has a small inductance, such as less than 2mH. This smaller Ldc is connected in parallel with a small damping resistor to improve system stability.
  • the prototype works normally, and the fourth switching element of the first resistive absorption element is not conducting.
  • the voltage on the bus capacitor fluctuates at a frequency that is 6 times the AC input power frequency.
  • the fourth switching element is Turn on in duty cycle or pulse form.
  • the motor can quickly reduce the frequency, and it can also be stopped directly.
  • the motor uses the zero vector stop function (if the motor itself has a small inductance and back EMF coefficient, it can be stopped directly).
  • the fourth switching element is turned off, ending the surge absorption process of this stage.
  • a controller including: the drive control circuit as described in any of the above embodiments. Therefore, the controller has all the technical effects of the drive control circuit, and no longer Repeat.
  • an air conditioner including: a motor; a drive control circuit as in any one of the above embodiments; wherein the signal input end of the motor is connected to the drive control circuit, and the drive control The drive signal output by the circuit is used to drive the motor to run, so the air conditioner has all the technical effects of the drive control circuit or the controller in any of the above embodiments, and will not be repeated.
  • the term “plurality” refers to two or more than two. Unless otherwise clearly defined, the orientation or positional relationship indicated by the terms “upper” and “lower” are based on the orientation described in the drawings. Or the positional relationship is only for the convenience of describing the application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the application; “Connected”, “installed”, “fixed”, etc. should be understood in a broad sense. For example, “connected” can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or through an intermediate medium. Indirectly connected. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Air Conditioning Control Device (AREA)
  • Power Conversion In General (AREA)

Abstract

L'invention concerne un dispositif de commande d'entraînement, un climatiseur et un dispositif de commande de climatiseur. Le circuit de commande d'entraînement comprend un pont onduleur utilisé pour émettre un signal d'attaque, le pont onduleur étant connecté en série entre un bus haute tension et un bus basse tension. Le circuit de commande comprend en outre : un réacteur utilisé pour absorber un signal de surtension généré pendant le fonctionnement d'une charge entraînée par le circuit de commande d'entraînement, le réacteur étant connecté entre un réseau électrique et la charge; et un condensateur de bus utilisé pour filtrer le signal de surtension sur une ligne de bus, le condensateur de bus étant connecté à la ligne de bus au niveau d'un côté d'entrée du pont onduleur. Dans la solution technique fournie par la présente invention, un condensateur électrolytique de coût élevé est remplacé par un condensateur à film mince de faible coût, prolongeant le temps de service du circuit de commande d'entraînement, réduisant l'apparition d'une réduction de l'efficacité de commande provoquée par le chauffage du condensateur de bus, et améliorant la fiabilité et l'efficacité de fonctionnement du circuit de commande d'entraînement.
PCT/CN2019/088669 2019-01-16 2019-05-27 Circuit de commande d'entraînement, climatiseur et dispositif de commande WO2020147239A1 (fr)

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CN114142685A (zh) * 2021-11-01 2022-03-04 苏州伟创电气科技股份有限公司 一种电机供电系统
CN114142685B (zh) * 2021-11-01 2023-02-10 苏州伟创电气科技股份有限公司 一种电机供电系统
CN114447879A (zh) * 2022-03-25 2022-05-06 西安西电电力系统有限公司 一种过流保护电路和控制方法
CN114447879B (zh) * 2022-03-25 2023-08-08 西安西电电力系统有限公司 一种过流保护电路和控制方法
CN114444425A (zh) * 2022-04-07 2022-05-06 安徽威灵汽车部件有限公司 直流母线间放电电阻的参数确定方法及相关装置

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