JP2022517387A - Drive control circuit, air conditioner and controller - Google Patents

Abstract

The present application provides a drive control circuit, an air conditioner and an air conditioner controller. The drive control circuit includes an inverter bridge used to output a drive signal and connected in series between the high voltage bus and the low voltage bus, wherein the drive control circuit drives the load. It is used to absorb the surge signal generated in the process of operating the inverter, and is used to filter and remove the surge signal on the bus line and the reactor connected between the transmission and distribution network and the load. And further includes a bus capacitor connected to the bus line on the input side of the inverter bridge. According to the technical means according to the present application, by using a relatively low cost film capacitor instead of the expensive electrolytic capacitor, the service life of the drive control circuit is extended, and the heat generated by the bus capacitor reduces the control efficiency. This situation is alleviated, and the reliability and operating efficiency of the drive control circuit are improved. [Selection diagram] FIG. 4

Description

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on January 16, 2019, with an application number of 200910041294.5 and the title of the invention being "drive control circuit and air conditioner". It is incorporated into the present application by incorporating all of its contents.
Further, in this application, priority is given to the Chinese patent application submitted to the China Patent Office on January 16, 2019, in which the application number is 200910041279.0 and the title of the invention is "drive control circuit, air conditioner controller and air conditioner". Incorporate it into the present application by claiming the right and using all of its contents.
Further, in this application, priority is given to the Chinese patent application submitted to the China Patent Office on January 16, 2019, in which the application number is 200910041711.6 and the title of the invention is "drive control circuit, air conditioner controller and air conditioner". Incorporate the right into the present application by traveling on a business trip and using all of its contents.

The present application relates to the field of compressor control technology, and specifically relates to a drive control circuit, an air conditioner, a drive control circuit, a controller, an air conditioner, a drive control circuit, a controller and an air conditioner.

Generally, in an inverter air conditioner controller, an AC-DC-AC (alternating current-direct current-AC) topology structure is often used, and as shown in FIG. 1, mainly an alternating current power supply module 10'and a power supply filter module 12' , A rectifying module 14', a filter module 16', an inverter module 18', and a load 20'.

Generally, in a filter module, a large-capacity electrolytic capacitor is often used as the main filter element in order to filter and flatten the rectified commercial power frequency signal, as shown in FIGS. 2 and 3. Both C ₂ to C ₇ are electrolytic capacitors for filters.

However, the use of electrolytic capacitors raises the following problems.
1. 1. The THD (Total Harmonic Distortion) of the input AC current increases.
2. 2. Since the service life of the electrolytic capacitor is short, the use of the electrolytic capacitor affects the maximum service life of the controller.
3. 3. Since the amount of heat generated by the electrolytic capacitor is large, the efficiency of the controller is reduced and the difficulty of heat management of the controller is increased.
4. If a large number of electrolytic capacitors are used, the stress distribution in the PCB (Printed Circuit Board) becomes non-uniform, and the weight of the entire controller also increases.

The present application aims to solve at least one of the technical problems in the prior art or the related art.

Therefore, the first aspect of the present application provides a drive control circuit.

A second aspect of the present application provides an air conditioner.

A third aspect of the present application provides a drive control circuit.

A fourth aspect of the present application provides a controller.

A fifth aspect of the present application provides an air conditioner.

A sixth aspect of the present application provides a drive control circuit.

A seventh aspect of the present application provides a controller.

An eighth aspect of the present application provides an air conditioner.

Therefore, the first aspect of the present application is a drive control circuit that provides a drive control circuit, is used for outputting a drive signal, and includes an inverter bridge connected between the high voltage bus and the low voltage bus. Therefore, the drive control circuit is used to absorb a surge signal generated in the process in which the drive control circuit drives and operates the load, and is a reactor connected between the transmission and distribution network and the load. It further includes a bus capacitor used to filter and remove surge signals on the bus line and connected to the bus line on the input side of the inverter bridge.

In the technical means, a reactor is provided in the drive control circuit, and the reactor absorbs a surge signal generated in the process of driving and operating the load by the drive control circuit to improve the surge resistance characteristic of the drive control circuit. The resonance frequency of the reactor and the bus capacitor is fixed at 1 / (2π√LC), L is the inductance of the reactor, C is the capacitance of the bus capacitor, and the resonance frequency is fixed by the distributed inductance-capacitor parameter. You can effectively prevent situations where you do not. Further, a bus capacitor having a small capacity is used instead of the conventional electrolytic capacitor, specifically, a film capacitor is used as a bus capacitor on the bus, and the film capacitor is connected in parallel to the input side of the inverter bridge, and the height is described. It is connected in series between a voltage bus and a low voltage bus and is used to filter and eliminate surge signals on the bus. By using the technical means according to the present application, the manufacturing cost is effectively reduced by using a relatively low cost film capacitor instead of the expensive electrolytic capacitor, and the service life of the film capacitor reaches 6250 hours. Since it is much larger than 2000 hours of a normal electrolytic capacitor, the useful life of the drive control circuit can be effectively extended. In addition, since the ESR (equivalent series resistance) of the film capacitor is small, the film capacitor generates much less heat than the electrolytic capacitor under the influence of the same ripple current, so the problem that the control efficiency decreases due to the heat generated by the bus capacitor is effective. This can be avoided, and the reliability and operating efficiency of the drive control circuit are improved.

Preferably, the drive control circuit is used to limit the charging current of the bus capacitor at the time of initial energization, and further includes a current limiting circuit connected in series with the high voltage bus.

Due to the small capacity of the bus capacitor used, the small capacity film capacitor cannot absorb much energy in the presence of surge voltage, so if the bus voltage is higher than the terminal voltage of the surge absorbing capacitor in this case, the current limit By establishing a circuit and limiting the charging current of the bus capacitor when energized, it is possible to prevent the bus capacitor from being destroyed by the overcurrent.

Preferably, the current limiting circuit is used to limit the charging current of the bus capacitor at the time of initial energization, and the thermistor connected in series with the high voltage bus is connected to the first resistant element to limit the current. It includes a relay that is used to control the current limiting to stop the current limit by causing or short-circuiting the first resistor element and is connected in parallel to both ends of the thermistor.

When a surge signal appears on a high voltage bus, the thermistor limits the charging current of the bus capacitor at the first energization to ensure that the bus capacitor is not destroyed and the resistance of the thermistor is linear with temperature. It changes to realize a limit on the rate of increase of the charging current. Relays are connected in parallel at both ends of the thermistor to form a thermistor with switching characteristics. When the drive control circuit is energized for the first time, the relay is off, and the first thermistor and bus capacitor are surged from the AC power supply side. After absorbing the signal and energizing for the first time, when the current on the high voltage bus is not large, the first relay is turned on and the current limiting effect of the first thermistor on the high voltage bus is relaxed.

The drive control circuit according to the embodiment of the present application may further have the following additional technical features.

In any of the above technical means, the drive control circuit is further used to absorb the surge signal on the bus line and further includes a first absorption circuit connected between the bus capacitor and the inverter bridge.

In the technical means, when a film capacitor is used as a bus capacitor, if there is a surge voltage in the circuit, the film capacitor cannot absorb a lot of surge energy, so the first absorption circuit is a bus capacitor and an inverter. By connecting to the bridge and helping the bus capacitor absorb the surge signal on the bus line on the inverter bridge side, the bus capacitor is prevented from being destroyed by the surge signal.

In any of the above technical means, the first absorption circuit is further used to absorb the surge signal, and the resistance absorption element connected in parallel to the bus capacitor and the surge signal of the resistance absorption element. A first switching element used to regulate the absorption process and connected in series with a resistance absorption element, the resistance absorption element absorbs the surge signal when the first switching element is turned on. The first switching element includes the first switching element in which the resistance absorbing element stops absorbing the surge signal when the first switching element is turned off.

In the technical means, the first absorption circuit includes a resistance absorption element for absorbing the surge signal on the side close to the inverter bridge of the bus capacitor. Specifically, when the first switching element is turned on, the resistance absorbing element is connected to the drive control circuit to absorb the surge signal, and specifically, the resistance absorbing element heats the electric energy of the surge signal. By converting it into energy and releasing it, the surge signal is eliminated, and by replacing it with a film capacitor with a smaller capacity, the bus capacitor is prevented from being destroyed by the surge signal. After the surge signal on the bus drops or disappears, the first switching element is turned off and the resistant absorption element is cut off from the drive control circuit to avoid affecting the normal electrical signal in the absorption control circuit.

In any of the above technical means, the resistant absorbing element further comprises a first resistance for absorbing the surge signal, the first resistance is connected in series with the first switching element, and the resistance value of the first resistance is 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.

In the technical means, the resistant absorption element includes a first resistor connected in series with the first switching element, and when the first switching element is turned on, the first absorption circuit is turned on and the surge signal is the first. When it is absorbed by one resistor and the first switching element is turned off, the first absorption circuit is turned off and the first resistor does not absorb the electric signal in the drive control circuit. Specifically, the resistance value 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 power demand for absorption, thereby the resistance absorption element. Surge absorption effect is guaranteed. The voltage protection threshold value and the current protection threshold value are related to the withstand voltage value and the withstand current value calibrated before shipment of each component in the drive circuit.

In any of the above technical means, the resistance absorbing element further includes a first unidirectional conducting element connected in parallel with the first resistance, and the conduction direction of the first unidirectional conducting element flows through the first resistance. It is the opposite of the direction of the current.

In the technical means, a first unidirectional conducting element is connected in parallel to both ends of the first resistor, specifically, the first unidirectional conducting element is a diode, and a self-inductance voltage emission circuit of the first resistor is provided. It is formed to prevent the self-inductance voltage generated in the first resistor from affecting the reliability of the first switching element.

Preferably, the first resistance is an induced resistance.

Preferably, the conduction direction of the first unidirectional conduction element is opposite to the current direction in the first resistance.

In any of the above technical means, the drive control circuit further includes a second absorption circuit for absorbing the surge signal on the high voltage bus and the low voltage bus, and the second absorption circuit absorbs the surge signal. It is used to adjust the absorption process of the surge signal of the capacitive absorption element and the capacitive absorption element connected in parallel to the bus capacitor, and is connected in series to the capacitive absorption element. Includes a second unidirectional conducting element.

In the technical means, the second absorption circuit absorbs the surge signal on the bus and has a capacitive absorption element connected in parallel to the bus capacitor and a second unidirectional connection connected to the capacitive absorption element in series. Further includes a conducting element. Specifically, the capacitive absorption element has capacitive characteristics, and the capacitive absorption element limits the absorption process of the surge signal of the capacitive absorption element, so that the capacitive absorption element has only the surge signal on the high voltage bus. By providing a unidirectional conducting element, the bus capacitor and the capacitive absorption element can be distinguished from each other, and the capacitive absorption element can be avoided from being used as the bus capacitor. The frequency of use of the sex absorbing element is reduced, and the service life of the second absorbing circuit is extended.

In any of the above technical means, the capacitive absorption element further comprises at least one capacitor, or a plurality of capacitors connected in series and / or in parallel, and the second absorption circuit is a first. It further includes a second resistor used to absorb the surge signal in the capacitive element and connected in parallel with the capacitor.

In the technical means, the capacitive absorber comprises one or more capacitors for absorbing the surge signal, the plurality of capacitors connected in series with each other and / or connected in parallel with each other, and in parallel with the capacitors. A second resistor to be connected is provided, and the surge signal in the capacitor is absorbed by using the second resistor connected in parallel with the capacitor, and the reliability of the drive control circuit is improved by providing the second resistor. ..

Preferably, both the second absorption circuit and the first absorption circuit may be provided, or one of them may be provided, and when both the second absorption circuit and the first absorption circuit are provided, the second absorption circuit is provided. The circuit and the first absorption circuit are connected in parallel with each other.

In any of the above technical means, the second absorption circuit is further used to limit the current flowing through the capacitive absorption element and further includes a current limiting resistance connected in series with the capacitive absorption element.

In the technical means, a current limiting resistor is provided in the second absorption circuit, and the current limiting resistor is connected in series with the capacitive absorption element to limit the current flowing through the capacitive absorption element when energized, so that the capacitive absorption element can be used. It is used to limit the charging current to a predetermined range and prevent the capacitive absorption element from being destroyed by overcurrent.

In any of the above technical means, the drive control circuit further comprises a fourth resistor used to absorb the oscillation signal generated in the reactor and connected in parallel with the reactor.

In the technical means, a fourth resistor is connected in parallel at both ends of the reactor to absorb the oscillation signal generated in the reactor. Specifically, the fourth resistor has a resistance value smaller than 200Ω. If attenuation is added and the bus capacitor is a film capacitor, the provision of a fourth resistor can improve the stability of the system.

In any of the above technical means, the drive control circuit is further connected to the first switching element and collects the feed signal of the drive control circuit to control and turn on the first switching element based on the feed signal. Alternatively, a sampling control circuit for turning off is further included, and the feeding signal includes a feeding signal on the AC side of the drive control circuit and a feeding signal on the bus line.

In the technical means, a sampling circuit is provided in the drive control circuit, and the sampling circuit collects the feeding signal on the AC side of the circuit and / or the feeding signal of the bus line, and the first is based on the voltage amplitude value of the feeding signal. The switching element is controlled to be turned on or off to control the surge signal absorption process of the first absorption circuit.

A second aspect of the present application provides an air conditioner comprising a motor and the drive control circuit according to any of the technical means, wherein the signal input end of the motor is connected to the drive control circuit to control the drive. The drive signal output from the circuit is used to drive and operate the motor. Since the air conditioner includes the drive control circuit according to any one of the above embodiments, it has all the beneficial effects of the drive control circuit according to any one of the above embodiments, and the description thereof is omitted here.

A third aspect of the present application is a drive control circuit that provides a drive control circuit, is used for outputting a drive signal, and includes an inverter bridge connected between a high voltage bus and a low voltage bus. The drive control circuit is used to absorb the surge signal generated in the process in which the drive control circuit drives and operates the load, and the reactor connected between the transmission and distribution network and the load, and the load. A bus capacitor used to provide the starting voltage required for energization, also used to absorb surge signals, and connected to the bus line on the input side of the inverter bridge, a first resistance element and a second The switching element, the second switching element is set to control the first resistance element to absorb the surge signal, and the first resistance element and the second switching element are connected in series and then have a high voltage. A first resistant element and a second switching element connected in series between a bus and a low voltage bus, a unidirectional conducting element or a third switching element, and a first capacitive element, which are unidirectional conducting. The element or the third switching element is set to limit the absorption of the surge signal on the high voltage bus by the first capacitive element, and the unidirectional conducting element or the third switching element and the first capacitive element are connected in series. Then, it is connected to the first capacitive element and the second switching element, which are connected in series between the high voltage bus and the low voltage bus, and the first resistance is based on the magnitude relationship between the bus signal and the voltage threshold. Includes a control chip that controls the operation of the element.

The drive control circuit according to the embodiment of the present application includes an inverter bridge, a bus capacitor, and a reactor, and the inverter bridge drives and controls the operation of the load, for example, controls the operation of the motor, and the capacity of the bus capacitor is small. Therefore, it is difficult to guarantee that the surge signal formed in the high-voltage bus is completely absorbed, and a reactor is provided to absorb the surge signal generated in the process in which the drive control circuit drives the operation of the load, and the power input. By filtering the signal, the surge signal fly back to the inverter bridge side and the reactor at the time of momentary stoppage is the first absorption composed of the unidirectional conduction element or the third switching element and the first capacitive element. It is emitted by the path to realize control over the surge signal, and it is guaranteed that the surge signal on the bus is absorbed, and it is composed of a first resistance element and a second switching element to absorb the surge signal. A second absorption path is further provided. Specifically, the control chip controls whether or not the first resistance element absorbs the surge signal based on the magnitude relationship between the bus signal and the voltage threshold, and the first absorption path. And by providing the second absorption path, the absorption capacity of the surge signal in the circuit is improved, the reliability of the circuit is improved, and the unidirectional conduction element may be an element having unidirectional conduction characteristics. For example, a capacitor.

The technical means further includes a second resistant element that is used to emit a surge signal in the first capacitive element and is connected in parallel to the first capacitive element.

In the technical means, after the first capacitive element absorbs the surge signal on the high voltage bus, the second capacitive element is used to emit the surge signal in the first capacitive element, and the second resistant element is used. The reliability of the drive control circuit is improved and the capacity demand of the absorption capacitor is reduced.

In any of the above technical means, further includes a second capacitive element used to absorb the surge signal on the high voltage bus and connected in series with the first capacitive element.

In the technical means, when the voltage of the high voltage bus is large, the surge signal absorption capacity of the high voltage bus is improved by connecting the second capacitive element in series with the first capacitive element.

In any of the above technical means, further includes a third resistant element used to emit a surge signal in the second capacitive element and connected in parallel to the second capacitive element.

In the technical means, when the second capacitive element is provided, the first capacitive element and the second capacitive element can be obtained by providing the third resistant element and using it in combination with the second capacitive element. The voltage across the ends is balanced, and the third resistant element is also used to emit a surge signal on the second capacitive element to improve the reliability of the drive control circuit.

In any of the above technical means, further includes a fourth resistant element for limiting the current flowing through the first capacitive element and / or the second capacitive element, the fourth resistant element, the second switching. The element and the first capacitive element are connected in series, or the fourth resistant element, the second switching element, the first capacitive element and the second capacitive element are connected in series.

In the technical means, a fourth capacitive element and / or a fourth resistant element connected in series with the second capacitive element is provided, and the fourth capacitive element is used to provide the first capacitive element and / or Drive control by limiting the current flowing through the second capacitive element and preventing the first capacitive element and / or the second capacitive element and the resistor element connected in parallel from being destroyed by the overcurrent. The reliability of the circuit is improved.

In any of the above technical means, further includes a first discharge element used to emit a spike voltage signal in the first resistant element and connected in parallel to the first resistant element.

In the technical means, by providing the first discharge element, the first discharge element connected in parallel to the first resistance element after the first resistance element absorbs the surge signal on the high voltage bus. By utilizing the spike voltage signal in the first resistance element and providing the first discharge element, the reliability of the drive control circuit is improved.

In any of the above technical means, further, a third switching element is connected to a control chip, which collects a bus signal and controls the third switching element to turn on or off based on the bus signal. Used for.

In the technical means, the controllability of the first absorption path is realized by providing the third switching element, and the control chip controls the third switching element based on the magnitude relationship between the bus signal and the voltage threshold value. The control of absorption of the surge signal by the first capacitive element is realized. By providing the third switching element, the controllability of the drive control circuit is improved, and the reliability of the drive control circuit is improved on the premise that the surge absorption capacity is improved.

In any of the above technical means, the voltage threshold further comprises a first voltage threshold and a second voltage threshold, the control chip specifically having a second voltage whose bus signal is greater than or equal to the first voltage threshold. If it is smaller than the threshold, the second switching element is controlled to be turned off, the third switching element is controlled to be turned on, and if the bus signal is larger than or equal to the second voltage threshold, the second switching element and the third switching are performed. It is used to control and turn on the element and control and turn off the second switching element and the third switching element when the bus signal is smaller than the first voltage threshold.

In the technical means, the bus signal (for example, 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 resistant element are selected based on the comparison result, respectively. Controlled 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 turn off and the second. 3 The switching element is controlled and turned on, the surge signal is absorbed by using the first capacitive element, and when the voltage signal of the high voltage bus is larger than or equal to the second voltage threshold, the second switching element and the third are used. The switching element is controlled and turned on to achieve a rapid absorption surge, avoiding the destruction of drive control circuit components if the voltage on the high voltage bus is too high, and the voltage signal on the high voltage bus is the first. When the voltage is smaller than the voltage threshold, the second and third switching elements are controlled to be turned off and the surge signal is absorbed by the bus capacitor, so that the components of both the first absorption path and the second absorption path can be used. Life is extended.

In any of the above technical means, the drive control circuit further includes a rectifying bridge that rectifies the AC signal and outputs it as a bus signal, and the bus signal is a bus capacitor or an inverter bridge via a high voltage bus and a low voltage bus. And output to the load, the control chip controls the ON state of the second switching element and the ON state of the third switching element based on the AC signal.

In any of the above technical means, the bus capacitor is further a film capacitor.

A fourth aspect of the present application provides a controller comprising the drive control circuit according to any one of the above technical means, wherein the controller includes the drive control circuit according to any one of the above embodiments. It has all the beneficial effects of the drive control circuit described in the embodiment, and the description thereof is omitted here.

A fifth aspect of the present application provides an air conditioner comprising a motor and the drive control circuit according to any of the technical means, wherein the signal input end of the motor is connected to the drive control circuit to control the drive. The drive signal output from the circuit is used to drive and operate the motor. Since the air conditioner includes the drive control circuit according to any one of the above embodiments, it has all the beneficial effects of the drive control circuit according to any one of the above embodiments, and the description thereof is omitted here.

A sixth aspect of the present application provides a drive control circuit, which is used to drive and control the operation of a load and includes an inverter bridge connected between a high voltage bus and a low voltage bus. A circuit, the drive control circuit is used to absorb a surge signal generated in the process in which the drive control circuit drives and operates the load, and is a reactor connected between the power transmission / distribution network and the load. And a bus capacitor used to provide the starting voltage required to energize the load, also used to absorb surge signals, and connected to the bus line on the input side of the inverter bridge. The control circuit is used to absorb the surge signal on the bus line, and is used to control the surge signal absorption process of the resistance absorption circuit connected in parallel with the bus capacitor and the resistance absorption circuit. A fourth switching element connected in series to the resistance absorption circuit, when the resistance absorption circuit absorbs a surge signal and the fourth switching element is turned off when the fourth switching element is turned on. Further includes a fourth switching element in which the resistance absorption circuit stops the absorption of the surge signal.

The drive control circuit according to the present application helps the bus capacitor absorb the surge signal on the bus by connecting the resistance absorption circuit in parallel with the bus capacitor, and also connects the fourth switching element and the resistance absorption circuit in series. By connecting to, the absorption process of the surge signal of the resistance absorption circuit is controlled. Specifically, when the prototype operates normally, the maximum value of the bus voltage is much smaller than the bus voltage protection threshold (which can be set based on the actual situation), and it is not necessary to include a resistance absorption circuit. , The 4th switching element does not have to function, the surge energy is mainly derived from the power input, the motor winding when the operation is stopped due to the failure of the prototype, the inductance flyback on the AC / DC side, and the kinetic energy of the motor, and the surge signal. When the bus voltage rises rapidly and the bus voltage exceeds the protection threshold, the component is destroyed due to the limited surge capacity absorption of the small capacity bus capacitor (eg film capacitor or small capacity electrolytic capacitor). To protect the components (mainly components such as smart power modules and capacitors) from high voltage breakdown, the 4th switching element is turned on, the resistance absorption circuit begins to absorb the surge and the bus voltage rises. When it drops rapidly and the bus voltage is within a reasonable range (which can be set based on the actual situation), the fourth switching element is turned off and the resistance absorption circuit ends the surge absorption process at this stage. The drive control circuit according to the present application can effectively alleviate the situation where the surge signal is not well absorbed by the bus capacitor, and can improve the stability and reliability of the bus voltage.

In the technical means, preferably, the resistance absorption circuit includes a fifth resistance element used to absorb the surge signal and connected between the high voltage bus and the low voltage bus.

In the technical means, the resistance absorption circuit includes a fifth resistance element, and the fifth resistance element is connected between the high voltage bus and the low voltage bus to absorb the surge signal on the bus. The resistance value and power of the fifth resistance element are related to the bus voltage protection threshold, the overcurrent characteristic of the fourth switching element, and the energy to be absorbed, and preferably one of the fifth resistance elements is connected in series. Alternatively, it may be a plurality of resistances, and the resistance may be an inductive resistance or a non-inductive resistance, and is not specifically limited here. By selecting the model number of the resistance, rapid absorption of the surge signal is realized and the bus voltage is rapid. The decline can be guaranteed.

In any of the above technical means, preferably the fourth switching element is a power switch or relay, the power switch or relay being used to control the process of absorbing the surge signal in the resistance absorption circuit.

In the technical means, the fourth switching element is, but is not limited to, a power switch or relay. The absorption process of the surge signal in the resistance absorption circuit is controlled by a power switch or relay.

In any of the above technical means, preferably the resistant absorption circuit is used to discharge the spike voltage of the fifth resistant element and is connected in parallel to the fifth resistant element. Including further.

In the technical means, the resistance absorption circuit further includes a second discharge element, and the second discharge element is connected in parallel with the fifth resistance element to form a spike voltage emission circuit of the fifth resistance element. Prevents the fifth resistant element from generating a spike voltage when the fourth switching element is turned off, affecting the drive control circuit or destroying the component.

In any of the above technical means, preferably the second discharge element is a unidirectional conducting element, or the second discharging element comprises a unidirectional conducting element and a resistor connected in series and the conduction of the unidirectional conducting element. The direction is opposite to the direction of the current flowing through the fifth resistance element.

In the technical means, the discharge circuit is provided for the spike voltage of the fifth resistant element by the combination of the unidirectional conducting element alone or the unidirectional conducting element connected in series with the resistor. The unidirectional conduction element is an element having a unidirectional continuity characteristic, for example, a diode or the like. Preferably, the unidirectional conducting element is a diode, and the choice of diode is related to the inductance and resistance value of the fifth resistant element.

In any of the above technical means, preferably the second discharge element is used to discharge the spike voltage of the fifth resistant element and is connected in parallel to the fifth resistant element with a third capacitance. Includes elements.

In the technical means, the second discharge element includes the third capacitive element, and the third capacitive element is connected in parallel with the fifth resistant element to form a discharge circuit of the spike voltage of the fifth resistant element. .. The selection of the third capacitive element is related to the inductance of the fifth resistant element, and specifically, there is a positive correlation between the capacitance of the third capacitive element and the inductance of the fifth resistant element, that is, The smaller the inductance of the fifth resistant element, the smaller the capacitance of the third capacitive element.

In any of the above technical means, preferably the second discharge element is used to limit the current flowing through the third capacitive element and is connected in series with the third capacitive element with a sixth resistance. Further includes elements.

In the technical means, the second discharge element further includes a sixth resistant element, the sixth resistant element is connected in series with the third capacitive element to limit the current flowing through the third capacitive element. , The reliability of the circuit is improved by preventing the third capacitive element from being destroyed by the overcurrent.

Preferably, the third capacitive element is a capacitor and the sixth resistant element is a resistor, i.e., an RC resonant circuit connected in series is used to emit the spike voltage of the fifth resistant element.

The selection of the second discharge element is related to the inductance and the resistance value of the fifth resistance element, and when the inductance of the fifth resistance element is negligibly small or not, for example, one fifth resistance element or When it is composed of a plurality of non-inductive resistors connected in series, the second discharge element may not be used and the fifth resistance element may be used alone as the absorption element.

In any of the above technical means, preferably, the fifth resistant element comprises one or more resistors, and the plurality of resistors are connected in series.

In any of the above technical means, preferably, the drive control circuit is connected to the fourth switching element and collects the feed signal of the drive control circuit to control the fourth switching element based on the feed signal. Further including a control circuit for turning on or off, the feeding signal is a bus signal and an AC signal.

In the embodiment, the power supply signal of the drive control circuit is collected by the control circuit, and the fourth switching element is controlled to be turned on or off based on the power supply signal to control the absorption process of the surge signal of the resistance element. .. The feeding signal is a bus signal and / or an AC signal.

Specifically, the AC signal is processed by the rectifier circuit to become a bus signal, and both the bus signal and the AC signal may be used as a determination condition for controlling the fourth switching element to turn it on or off.

In any of the above technical means, the bus capacitor is preferably a film capacitor.

A seventh aspect of the present application provides a controller comprising the drive control circuit according to any one of the above technical means, wherein the air conditioner controller includes the drive control circuit according to any one of the above embodiments. It has all the beneficial effects of the drive control circuit described in any of the embodiments and is omitted herein.

Eighth aspect of the present application provides an air conditioner comprising a motor and the drive control circuit according to any of the above technical means, wherein the signal input end of the motor is connected to the drive control circuit and outputs from the drive control circuit. The drive signal generated is used to drive and operate the motor. Since the air conditioner includes the drive control circuit or controller according to any one of the above embodiments, it has all the beneficial effects of the drive control circuit or controller according to any one of the above embodiments and is described herein. Omitted.

The above and / or other aspects and advantages of the present application will be clarified and easily understood from the description of the examples with reference to the following drawings.

A schematic diagram of a normal AC-DC-AC topology structure is shown. A schematic diagram of a normal drive control circuit is shown. A schematic diagram of another normal drive control circuit is shown. A schematic diagram of a drive control circuit according to an embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of the topology structure of the drive control circuit according to the embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of the first voltage threshold value and the second voltage threshold value of one embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown. A schematic diagram of a drive control circuit according to another embodiment of the present application is shown.

For a better understanding of the above mentioned objectives, features and advantages of the present application, the present application will be described in more detail in connection with the drawings and specific embodiments. As long as there is no contradiction, the embodiments of the present application or the features of the embodiments can be combined with each other.

Although many details are provided in the following description for a full understanding of the present application, the present application may be implemented in a different form than described herein, and the scope of protection of the present application is disclosed below. It is not limited to a specific embodiment.

Next, the drive control circuit, the air conditioner, the drive control circuit, the controller, the air conditioner, the drive control circuit, the controller, and the air conditioner described in some examples of the present application will be described with reference to FIGS. 4 to 48.

As shown in FIG. 4, an embodiment of the first aspect of the present application is used to provide a drive control circuit, output a drive signal, and is connected between a high voltage bus and a low voltage bus. A drive control circuit including an inverter bridge, the drive control circuit is used to absorb a surge signal generated in the process in which the drive control circuit drives and operates a load, and is used for a transmission / distribution network and a load. It further includes a reactor Ldc ₂ connected in between and a bus capacitor used to filter and remove surge signals on the bus line and connected to the bus line on the input side of the inverter bridge.

In the embodiment, the inductance Ldc ₂ is provided in the drive control circuit, and the inductance Ldc ₂ is used to absorb surge signals generated on the AC input side and the inverter bridge to improve the surge resistance characteristics of the drive control circuit. , The resonance frequency of the reactor Ldc ₂ and the bus capacitor is fixed at 1 / (2π√LC), L is the inductance of the reactor Ldc ₂ , C is the capacitance of the bus capacitor, and the resonance frequency is determined by the distributed inductance-capacitor parameter. It is possible to effectively prevent the situation where it is not fixed. Further, a bus capacitor having a small capacity is used instead of the conventional electrolytic capacitor, specifically, a film capacitor is used as a bus capacitor on the bus, and the film capacitor is connected in parallel to the input side of the inverter bridge, and the height is described. It is connected in series between a voltage bus and a low voltage bus and is used to filter and eliminate surge signals on the bus. By using the technical means according to the present application, the manufacturing cost is effectively reduced by using a relatively low cost film capacitor instead of the expensive electrolytic capacitor, and the service life of the film capacitor reaches 6250 hours. Since it is much larger than 2000 hours of a normal electrolytic capacitor, the useful life of the drive control circuit can be effectively extended. In addition, since the ESR (equivalent series resistance) of the film capacitor is small, the film capacitor generates much less heat than the electrolytic capacitor under the influence of the same ripple current, so the problem that the control efficiency decreases due to the heat generated by the bus capacitor is effective. This can be avoided, and the reliability and operating efficiency of the drive control circuit are improved.

Preferably, the capacity of the bus capacitor is smaller than the set capacity, and specifically, the set capacity is calculated according to the following formula.

C _dc > L _S P _L / R _S v _dc0 ²

In the equation, _{C dc} is the set capacitance, _LS is the total inductance on the DC side of the equivalent drive control circuit, PL is the load power of the drive control circuit, and _RS is the DC side of the equivalent drive control circuit. It is the total resistance, and _vdc0 is the average value of the bus voltage. For example, taking the 7P prototype as an example, it is determined that the C _dc must be larger than 840 μF and the set capacitance is 840 μF or more by the formula. In actual implementation, it is set to 1230 μF.

Preferably, the specifications of the film capacitor are 900 V and 30 μF.

Preferably, a current limiting resistor R ₀ is further provided between the reactor Ldc ₂ and the rectifying bridge, and a normal resistor may be used as the resistor R ₀ .

Preferably, as shown in FIG. 5, the drive control circuit is used to limit the charging current of the bus capacitor at the time of initial energization, and further includes a current limiting circuit connected in series with the high voltage bus.

Due to the small capacity of the bus capacitor used, the small capacity film capacitor cannot absorb much energy in the presence of surge voltage, so if the bus voltage is higher than the terminal voltage of the surge absorbing capacitor in this case, the current limit By establishing a circuit and limiting the charging current of the bus capacitor when energized, it is possible to prevent the bus capacitor from being destroyed by the overcurrent.

Preferably, as shown in FIG. 5, the current limiting circuit is used to limit the charging current of the bus capacitor at the time of initial energization, and the thermistor connected in series with the high voltage bus and the first resistance element. Is used to control the current limiting by connecting the thermistor to stop the current limiting by short-circuiting the first resistance element, and includes a relay connected in parallel to both ends of the thermistor.

In this embodiment, when a surge signal appears in a high-voltage bus, the thermistor limits the charging current of the bus capacitor at the time of initial energization to ensure that the bus capacitor is not destroyed and the resistance value of the thermistor is increased. It changes linearly with temperature to limit the rate of increase of the charging current. Relays are connected in parallel at both ends of the thermistor to form a thermistor with switching characteristics. When the drive control circuit is energized for the first time, the relay is off, and the first thermistor and bus capacitor are surged from the AC power supply side. After absorbing the signal and energizing for the first time, when the current on the high voltage bus is not large, the first relay is turned on and the current limiting effect of the first thermistor on the high voltage bus is relaxed.

In one embodiment of the present application, further, as shown in FIG. 6A, the drive control circuit is used to absorb the surge signal on the bus line, and the first absorption connected between the bus capacitor and the inverter bridge. Further includes circuits.

In this embodiment, when a film capacitor is used as a bus capacitor, the film capacitor cannot absorb a large amount of surge energy when there is a surge voltage in the circuit. Therefore, the first absorption circuit is used as a bus capacitor and an inverter bridge. By connecting between and helping the bus capacitor absorb the surge signal on the bus line on the inverter bridge side, the bus capacitor is prevented from being destroyed by the surge signal.

Further, in one embodiment of the present application, as shown in FIG. 6A, the first absorption circuit is used to absorb a surge signal and is resistant to a resistance absorption element connected in parallel to the bus capacitor. It is a first switching element used to adjust the absorption process of the surge signal of the absorption element and is connected in series with the resistance absorption element, and when the first switching element is turned on, the resistance absorption element becomes The first switching element includes the first switching element that absorbs a surge signal and stops absorption of the surge signal when the first switching element is turned off.

In this embodiment, the first absorption circuit includes a resistance absorption element for absorbing a surge signal on the side close to the inverter bridge of the bus capacitor. Specifically, when the first switching element is turned on, the resistance absorbing element is connected to the drive control circuit to absorb the surge signal, and specifically, the resistance absorbing element heats the electric energy of the surge signal. By converting it into energy and releasing it, the surge signal is eliminated, and by replacing it with a film capacitor with a smaller capacity, the bus capacitor is prevented from being destroyed by the surge signal. After the surge signal on the bus drops or disappears, the first switching element is turned off and the resistant absorption element is cut off from the drive control circuit to avoid affecting the normal electrical signal in the absorption control circuit.

In one embodiment of the present application, further, as shown in FIG. 6A, the resistant absorbing element includes a first resistance for absorbing a surge signal, the first resistance is connected in series with the first switching element, and the first is The resistance value of the resistor corresponds to a preset bus voltage protection threshold and / or the resistance value of the first resistor corresponds to a preset overcurrent protection threshold of the first switching element.

In this embodiment, the resistant absorption element includes a first resistor connected in series with the first switching element, and when the first switching element is turned on, the first absorption circuit is turned on and the surge signal is first. When absorbed by a resistor and the first switching element is turned off, the first absorption circuit is turned off and the first resistor no longer absorbs the electrical signal in the drive control circuit. Specifically, the resistance value of the first resistor corresponds to a preset bus voltage protection threshold value and a preset overcurrent protection threshold value of the first switching element, thereby guaranteeing the surge absorption effect of the resistance absorbing element. Will be done. The voltage protection threshold value and the current protection threshold value are related to the withstand voltage value and the withstand current value calibrated before shipment of each component in the drive circuit.

Further, as shown in FIG. 6A, when the first resistance is a non-inductive resistance, the resistance absorbing element further includes a diode connected in antiparallel to the first resistance to form an induced voltage emission circuit. ..

Further, as shown in FIG. 6B, when the first resistance is a non-inductive resistance, the resistance absorbing element further includes a capacitor C ₁ and a resistance R ₁ , and C ₁ and R ₁ are connected in series. By connecting in parallel to both ends of the first resistor, an induced voltage discharge circuit is formed.

Further, in one embodiment of the present application, as shown in FIG. 6A, the resistance absorbing element includes a first unidirectional conducting element connected in parallel with the first resistance, and the conduction direction of the first unidirectional conducting element is the first. It is opposite to the direction of the current flowing through one resistance.

In the embodiment, the first unidirectional conduction element is connected in parallel at both ends of the first resistor, specifically, the first unidirectional conduction element is a diode, and a self-inductance voltage emission circuit of the first resistor is formed. It is used to prevent the self-inductance voltage generated in the first resistor from affecting the reliability of the first switching element.

Preferably, the first resistance is an induced resistance.

Preferably, the conduction direction of the first unidirectional conduction element is opposite to the current direction in the first resistance.

In one embodiment of the present application, further, as shown in FIG. 7, the drive control circuit further includes a second absorption circuit for absorbing surge signals on the high voltage bus and the low voltage bus, the second absorption circuit. A capacitive absorption element used to absorb a surge signal and connected in parallel to a bus capacitor, and a capacitive absorption element used to adjust the surge signal absorption process of the capacitive absorption element, and in series with the capacitive absorption element. Includes a second unidirectional conducting element connected to.

In the embodiment, the second absorption circuit absorbs the surge signal on the bus and has a capacitive absorption element connected in parallel to the bus capacitor and a second unidirectional conduction connected in series to the capacitive absorption element. Further includes elements. Specifically, the capacitive absorption element has capacitive characteristics, and the capacitive absorption element limits the absorption process of the surge signal of the capacitive absorption element, so that the capacitive absorption element has only the surge signal on the high voltage bus. By providing a unidirectional conducting element, the bus capacitor and the capacitive absorption element can be distinguished from each other, and the capacitive absorption element can be avoided from being used as the bus capacitor. The frequency of use of the sex absorbing element is reduced, and the service life of the second absorbing circuit is extended.

In one embodiment of the present application, further, as shown in FIG. 7, the capacitive absorption element includes at least one capacitor, or a plurality of capacitors connected in series and / or in parallel, and is a second absorption circuit. Is used to absorb the surge signal in the first capacitive element and further includes a second resistor connected in parallel with the capacitor.

In this embodiment, the capacitive absorber comprises one or more capacitors for absorbing the surge signal, the plurality of capacitors connected in series with each other and / or connected in parallel with each other, and connected in parallel with the capacitors. A second resistor is provided, and the second resistor connected in parallel to the capacitor is used to absorb the surge signal in the capacitor, and the second resistor is provided to improve the reliability of the drive control circuit.

Preferably, both the second absorption circuit and the first absorption circuit may be provided, or one of them may be provided, and when both the second absorption circuit and the first absorption circuit are provided, the second absorption circuit is provided. The circuit and the first absorption circuit are connected in parallel with each other.

In one embodiment of the present application, further, as shown in FIG. 7, the second absorption circuit is used to limit the current flowing through the capacitive absorption element, and is a current limiting resistance connected in series with the capacitive absorption element. Including further.

In the embodiment, a current limiting resistor is provided in the second absorption circuit, 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 energized to charge the capacitive absorbing element. It is used to limit the current to a predetermined range and prevent the capacitive absorption element from being destroyed by overcurrent.

In one embodiment of the present application, the drive control circuit is further used to absorb the oscillation signal generated in the reactor Ldc ₂ and further includes a fourth resistor connected in parallel to the reactor Ldc ₂ .

In the embodiment, the fourth resistor is connected in parallel to both ends of the reactor Ldc ₂ to absorb the oscillation signal generated in the reactor Ldc _2. Specifically, the resistance value of the fourth resistor is 200Ω. Smaller system attenuation is added, and if the bus capacitor is a film capacitor, a fourth resistor can improve the stability of the system.

Further, in one embodiment of the present application, as shown in FIG. 8, three or two current limiting circuits may be provided, and specifically, PTC ₁ , PTC ₂ and PTC ₃ may be provided. Any two of PTC ₁ , PTC ₂ and PTC ₃ may be provided, for example PTC ₁ and PTC ₂ , respectively, located on the three-phase or arbitrary two-phase input line on the AC input source side, respectively. Specifically, it is located between the filter circuit and the rectifying bridge, and when the relay is turned off for the first time, the thermistor is connected to the circuit and limits the charging current of the bus capacitor.

Further, in one embodiment of the present application, as shown in FIG. 9, three current limiting circuits are provided, specifically PTC ₁ , PTC ₂ and PTC ₃ , respectively, in a three-phase bus on the AC input source side. It is located, specifically between the filter circuit and the rectifying bridge, and at the first energization, the thermistor is connected to the circuit by turning off the relay and limits the charging current of the bus capacitor. Further, the drive control circuit is provided with a first absorption circuit.

In one embodiment of the present application, as shown in FIGS. 10 and 11, three current limiting circuits are provided, specifically PTC ₁ , PTC ₂ , and PTC ₃ , respectively, which are three on the AC input source side. Located on the phase bus, specifically between the filter circuit and the rectifying bridge, the thermistor is connected to the circuit by turning off the relay at the first energization, limiting the charging current of the bus capacitor. .. Further, both the first absorption circuit and the second absorption circuit are provided in the drive control circuit, and as shown in FIG. 10, the first absorption circuit is located between the bus capacitor C and the inverter bridge, and the second absorption circuit is provided. Is located between the rectifying bridge and the reactor Ldc ₂ , or as shown in FIG. 11, the first absorption circuit is located between the bus capacitor C and the inverter bridge, and the second absorption circuit is the reactor Ldc ₂ and the bus. It is located between the capacitor C and the capacitor C.

Taking the solution of FIG. 11 as an example, when the system operates normally, the voltage on the capacitive absorption element of the second absorption circuit is maintained at the maximum value of the DC bus voltage, and in this case, it corresponds to the resistance absorption element. The surge voltage is turned off because the surge energy is mainly derived from the power input, the compressor winding when the operation is stopped due to a system failure, the inductance flyback on the AC / DC side, and the kinetic energy of the compressor. When the bus voltage is higher than the terminal voltage of the surge absorption capacitor, the capacitive absorption element works and the remaining energy is the film capacitor and surge absorption capacitor because the small capacity film capacitor cannot absorb much energy. When the DC bus voltage gradually rises as it flows into the module and the surge energy is absorbed (the larger the surge absorption capacitor, the slower the DC bus voltage rises), and the DC bus voltage is higher than a specific set value. (For example, it is set to 720V and is actually adjustable), a resistance absorbing element is inserted, the first switching element begins to be turned on by pulse width modulation (PWM) method or definite method, and a surge voltage appears. Sometimes the bus voltage is guaranteed to be as stable as possible.

In one embodiment of the present application, further, as shown in FIG. 12, a current limiting circuit is provided in the high voltage bus, and at the first energization, the thermistor is connected to the circuit by turning off the relay, and the bus capacitor is connected. Limit the charging current. Further, the drive control circuit includes a second absorption circuit, and the surge signal is absorbed by the capacitive absorption element in the second absorption circuit.

In one embodiment of the present application, further, as shown in FIGS. 13 and 14, a current limiting circuit is provided in the high voltage bus, and at the first energization, the relay is turned off so that the thermistor is connected to the circuit. Limit the charging current of the bus capacitor. Further, both the first absorption circuit and the second absorption circuit are provided in the drive control circuit, and as shown in FIG. 13, the first absorption circuit is located between the bus capacitor C and the inverter bridge, and the second absorption circuit is provided. Is located between the current limiting circuit and the reactor Ldc ₂ , or as shown in FIG. 14, the first absorption circuit is located between the bus capacitor C and the inverter bridge, and the second absorption circuit is the reactor Ldc ₂ . It is located between the bus capacitor C and the bus capacitor C.

Further, in one embodiment of the present application, as shown in FIG. 15, three current limiting circuits are provided, specifically PTC ₁ , PTC ₂ and PTC ₃ , respectively, in a three-phase bus on the AC input source side. Positioned, the thermistor is connected to the circuit by turning off the relay at the first energization, limiting the charging current of the bus capacitor. Further, a second absorption circuit is provided in the drive control circuit, a conduction element is provided in the second absorption circuit, and the conduction element is specifically the first switching element. When the surge signal is weak in the system, the first When the switching element is turned off and the bus capacitor absorbs the surge signal and the surge signal is strong in the system, the first switching element is turned on and the second absorption circuit is connected between the high voltage bus and the low voltage bus. It helps to absorb the surge signal.

In one embodiment of the present application, further, as shown in FIG. 16, a current limiting circuit is provided in the high voltage bus, and at the first energization, the thermistor is connected to the circuit by turning off the relay, and the bus capacitor is connected. Limit the charging current. Further, a second absorption circuit is provided in the drive control circuit, a conduction element is provided in the second absorption circuit, and the conduction element is specifically the first switching element. When the surge signal is weak in the system, the first When the switching element is turned off and the bus capacitor absorbs the surge signal and the surge signal is strong in the system, the first switching element is turned on and the second absorption circuit is connected between the high voltage bus and the low voltage bus. It helps to absorb the surge signal.

In one embodiment of the present application, further, as shown in FIG. 17, a current limiting circuit is provided in the high voltage bus, and at the first energization, the thermistor is connected to the circuit by turning off the relay, and the bus capacitor is connected. Limit the charging current. Further, 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 located on both sides of the bus capacitor, respectively, and the second absorption circuit is provided with a conduction element. Specifically, it is the first switching element, and the first absorption circuit is also provided with the first switching element, and when the surge signal is weak in the system, the first switching element of the first absorption circuit and the second absorption circuit is used. When turned off, the bus capacitor absorbs the surge signal, and when the surge signal is strong in the system, the corresponding first switching element is turned on to make the first absorption circuit and / or the second absorption circuit a high voltage bus. It is connected between the and the low voltage bus to help absorb the surge signal.

Further, in one embodiment of the present application, as shown in FIG. 18, three current limiting circuits are provided, specifically, PTC ₁ , PTC ₂ and PTC ₃ , respectively, in a three-phase bus on the AC input source side. Positioned, the thermistor is connected to the circuit by turning off the relay at the first energization, limiting the charging current of the bus capacitor. Further, 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 located on both sides of the bus capacitor, respectively, and the second absorption circuit is provided with a conduction element. Specifically, it is the first switching element, and the first absorption circuit is also provided with the first switching element, and when the surge signal is weak in the system, the first switching element of the first absorption circuit and the second absorption circuit is used. When turned off, the bus capacitor absorbs the surge signal, and when the surge signal is strong in the system, the corresponding first switching element is turned on to make the first absorption circuit and / or the second absorption circuit a high voltage bus. It is connected between the and the low voltage bus to help absorb the surge signal.

Further, in one embodiment of the present application, as shown in FIG. 19, three current limiting circuits are provided, specifically PTC ₁ , PTC ₂ and PTC ₃ , respectively, in a three-phase bus on the AC input source side. Positioned, the thermistor is connected to the circuit by turning off the relay at the first energization, limiting the charging current of the bus capacitor. Further, 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 located on both sides of the bus capacitor, respectively, and the second absorption circuit is provided with a conduction element. Specifically, it is a diode, so that the surge signal on the bus enters the second absorption circuit via the diode, and the discharge current of the capacitive absorption element on the second absorption circuit is turned off by the diode, so that it is on the bus. There is no need to affect the electrical signal of. Also, a fourth resistor _R4 is connected in parallel to the reactor Ldc ₂ which reduces the oscillation signal between the reactor Ldc ₂ and the bus capacitor and is a system due to the LC oscillation effect between the reactor Ldc ₂ and the bus capacitor. It is used to improve the stability of the system by preventing fluctuations in the system.

In one embodiment of the present application, further, as shown in FIG. 20, a current limiting circuit is provided in the high voltage bus, and at the first energization, the thermistor is connected to the circuit by turning off the relay, and the bus capacitor is connected. Limit the charging current. Further, 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 located on both sides of the bus capacitor, respectively, and the second absorption circuit is provided with a conduction element. Specifically, it is a diode, so that the surge signal on the bus enters the second absorption circuit via the diode, and the discharge current of the capacitive absorption element on the second absorption circuit is turned off by the diode, so that it is on the bus. There is no need to affect the electrical signal of. Also, a fourth resistor _R4 is connected in parallel to the reactor Ldc ₂ , which reduces the oscillation signal between the reactor Ldc ₂ and the bus capacitor, and is a system due to the LC oscillation effect between the reactor Ldc ₂ and the bus capacitor. It is used to improve the stability of the system by preventing fluctuations in the system.

In one embodiment of the present application, further, as shown in FIGS. 21, 22, 23, 24, 25 and 26, the drive control circuit includes a third absorption circuit, and the third absorption circuit is a current limiting element. A first switching element connected in parallel to both ends of the thermistor PTC or current limiting resistor R and the thermistor PTC or current limiting resistor R is included in the current limiting element, including a capacitive absorption element and a unidirectional conduction element. May be used. Specifically, the surge energy is mainly derived from the power input, the compressor winding when the operation is stopped due to the failure of the prototype, the inductance flyback on the AC / DC side, and the kinetic energy of the compressor, and when there is a surge voltage, Since a small-capacity film capacitor cannot absorb a large amount of energy, the third absorption occurs when the bus voltage is higher than the terminal voltage of the capacitive absorption element (specifically, the capacitors C ₂ and C ₃ ) in the third absorption circuit. The circuit functions and the remaining energy flows into the bus capacitor and the third absorption circuit, at which time the first switching element is turned on, the thermista PTC or current limiting resistor R is shorted, and the surge energy is quickly absorbed. , When the power supply is turned off or the DC bus voltage is lower than the definite value (preferably set to 200V), it is determined that no current is flowing through the first switching element, and therefore the first switching element is controlled and turned off. (It is necessary to determine whether or not a current flows through the first switching element only when the AC relay is used as the first switching element, and a normal IGBT (Insulated Gate Voltage Transistor) or DC relay is used. (May be turned off at any time), that is, when energized, the thermista PTC or current limiting resistor R is connected in series to the circuit of the capacitive absorber to serve the purpose of current limiting, after which the first switching element is turned on. Turn on to short-circuit the thermista PTC or current limiting resistor R to serve the purpose of rapid absorption of surge energy.

Further, as shown in FIG. 21, the current limiting element is located between the unidirectional conducting element and the capacitive absorption element, or as shown in FIG. 22, the current limiting element is a high voltage bus and a unidirectional conducting element. The current limiting element is located between the capacitive absorption element and the low voltage bus, as shown in FIG. 23.

Further, as shown in FIGS. 24, 25 and 26, the current limiting resistance R ₁ (thermistor PTC or current limiting resistance R) may be realized by connecting two resistances R ₄ and R ₅ in series. The sum of the resistance values of the two resistances R ₄ and R ₅ is equal to the resistance value of R ₁ . The first switching element is connected in parallel to both ends of the resistor _R4 , and when the system is energized, the resistors _R4 and R5 are simultaneously connected in series to the _third current limiting circuit to limit the current, and after energization. At the surge absorption stage, the switching element is turned on and the resistance R ₄ is short-circuited. At this time, the resistance R ₅ independently limits the current.

Further, in one embodiment of the present application, as shown in FIG. 27, both the first absorption circuit and the third absorption circuit are provided in the drive control circuit, and the current limiting element, the capacitive absorption element, and the unidirectional are provided. A conducting element is included, the current limiting element includes current limiting resistors R ₄ and R ₅ , R ₅ is located between the unidirectional conducting element and the capacitive absorption element, and R ₄ is the capacitive absorption element and low. Located between the voltage bus, the first switching element is connected in parallel across the resistor _R4 , and when the system is energized, the resistors _R4 and R5 are simultaneously connected in series with the _third current limiting circuit. The current is limited, and at the surge absorption stage after energization, the switching element is turned on and the resistor _R4 is short-circuited. _At this time, the resistor R5 independently limits the current.

In one embodiment of the present application, the drive control circuit is further provided with a fourth absorption circuit, as shown in FIGS. 28 and 29. The fourth absorption circuit includes a capacitive absorption element, a resistance absorption element, and a current limiting element, the capacitive absorption element is connected in series with the current limiting element, and the capacitive absorption element includes a conduction element and an absorption capacitor. , The current limiting resistor R ₁ and the discharge resistor are included, and two absorption capacitors are provided, which are C ₂ and C ₃ , respectively, and R ₂ and R ₃ are connected in parallel to both ends of C ₂ and C ₃ , respectively. The conduction element is specifically a unidirectional conduction element or a _first switching element, and the resistance absorption element is parallel to the absorption resistance and _both ends of the absorption resistance. It is preferable to use a diode connected to the flyback circuit including a flyback circuit, a first switching element, and a current measuring element, which are connected in antiparallel to the flyback circuit. If is lower than the definite value and the current measuring element determines that no current is flowing through the first switching element, the first switching element is controlled to be turned off.

Further, as shown in FIG. 28, the input end of the resistance element is connected between the conduction element and the current limiting resistor _R1 , and the output end of the resistance element is connected to the low voltage bus.

Further, as shown in FIG. 29, the input end of the resistance element is connected between the current limiting resistor R ₁ and the absorption capacitor C ₂ , and the output end of the resistance element is connected to the low voltage bus.

In the above embodiment corresponding to FIGS. 4 to 29, Lac refers to the actual AC side inductance model and the inductance of the input power line, and includes the inductance and the resistance, and the AC side inductance used in the conventional model is 25 mH, 500 mΩ. The inductance of the input power line is less than or equal to 10 mH (numerical expansion), the resistance value is greater than or equal to 0.5Ω (the resistance of the lead wire actually used is about 1.2Ω), and Ldc is the actual. Refers to the DC side inductance model, including inductance and resistance, when the inductance of Ldc is 4.5 mH, 120 mΩ, R ₄ is the attenuation resistance, and the attenuation resistance R ₄ is Ldc and the inductance is set to 4.5 mH. Since Ldc is not provided in the prototype which is not provided and has a capacitance of 6KW, _R4 may not be provided, and Lac or Ldc exists because the EMC harmonic is required, and the EMC harmonic is required. In the area where waves are required, Lac or Ldc may be present in the prototype, or Lac and Ldc may coexist. In areas where harmonics are not required, neither Lac nor Ldc exist, and the position of Ldc in the topology circuit to deal with high frequency harmonics (if this is ignored, the Ldc inductor does not have to be used). Ldc ₂ having a small inductance may be used, and a small attenuation resistor R ₄ may be connected in parallel to the small Ldc ₂ to improve the stability of the system.

In one embodiment of the present application, the drive control circuit further collects a feed signal of the drive control circuit and controls a first switching element based on the feed signal to turn it on or off (not shown). ), And the power supply signal includes the power supply signal on the AC side of the drive control circuit and the power supply signal on the bus line.

In the embodiment, as shown in FIG. 30, a sampling control circuit 20 is provided in the drive control circuit, and the sampling control circuit 20 collects a power supply signal on the circuit AC side and / or a power supply signal of the bus line to supply power. The first switching element is controlled to be turned on or off based on the voltage amplitude value of the signal to control the surge signal absorption process of the first absorption circuit.

Preferably, the power supply signal on the AC side is specifically an electric signal between the AC power supply module 10 and the filter circuit 12.

Preferably, the feeding signal on the AC side is specifically an electrical signal between the filter circuit 12 and the rectifying bridge 14.

Preferably, the bus line feed signal includes an electrical signal between the rectifying bridge 14 and the absorption circuit 16, specifically an electrical signal between the rectifying bridge 14 and the reactor Ldc ₂ .

Preferably, the bus line feed signal includes an electrical signal between the absorption circuit 16 and the inverter bridge 18.

An embodiment of the second aspect of the present application provides an air conditioner comprising a motor and the drive control circuit according to any one of the above embodiments, wherein the signal input end of the motor is connected to the drive control circuit. The drive signal output from the drive control circuit is used to drive and operate the motor. Since the air conditioner includes the drive control circuit according to any one of the above embodiments, it has all the beneficial effects of the drive control circuit according to any one of the above embodiments, and the description thereof is omitted here.

As shown in FIGS. 32 and 33, an embodiment of the third aspect of the present application provides a drive control circuit, which is a surge generated in the process of the drive control circuit driving and operating a load. It is used to absorb the signal and is used to provide the reactor Ldc connected between the transmission and distribution network and the load and the starting voltage required to energize the load, and also to absorb the surge signal. The bus capacitor C ₁ used and connected to the bus line on the input side of the inverter bridge, the first resistance element R ₁ and the second switching element, and the second switching element is the first resistance element R ₁ . The first resistance element _R1 and the second switching element are connected in series and are connected in series between the high voltage bus and the low voltage bus. The first resistance element and the second switching element, the unidirectional conducting element or the third switching element, the first capacitive element C ₂ , and the unidirectional conducting element or the third switching element is the first capacitive element C. It is set to limit the absorption of surge signals on the high voltage bus by ₂ , and a unidirectional conducting element or a third switching element is connected in series with the first capacitive element C ₂ to form a high voltage bus and a low voltage bus. The first capacitive element C 2 connected in series between the first capacitive element C ₂ and the first resistant element R ₁ connected to the second switching element based on the magnitude relationship between the voltage signal of the high voltage bus and the set voltage. Includes a control chip (not shown) that controls operation.

Specifically, 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. Including D ₁ , the inverter bridge drives and controls the operation of the load, for example the operation of the motor, and because the capacity of the bus capacitor C ₁ is small, the surge signal formed in the high voltage bus is completely absorbed. It is difficult to guarantee that, and by providing the reactor Ldc, the drive control circuit absorbs the surge signal generated in the process of driving the operation of the load, and by blocking the surge signal from the inverter bridge side, the inverter bridge side The surge signal from is emitted by the first absorption path composed of the unidirectional conduction element D ₁ and the first capacitive element C ₂ , the control for the surge signal is realized, and the surge signal on the bus is completely eliminated. It is guaranteed to be absorbed, and a second absorption path composed of a first resistance element _R1 and a second switching element is further provided to absorb the surge signal. Specifically, the control chip is a bus signal. It controls whether the first resistance element R ₁ absorbs the surge signal based on the magnitude relationship between the voltage threshold and the voltage threshold, and the first absorption path and the second absorption path are provided to absorb the surge signal in the circuit. The reliability of the circuit is improved. Specifically, the anode of the unidirectional conducting element D ₁ is connected to the high voltage bus, and the cathode of the unidirectional conducting element D ₁ is the first capacitive element C ₂ . The unidirectional conduction element D ₁ may be an element having a unidirectional conduction characteristic, for example, a diode, and the voltage threshold is related to the voltage of the high voltage bus.

Specifically, as shown in FIG. 31, a schematic circuit diagram of a drive control circuit in which the first resistance element R ₁ and the second switching element include a thermistor PTC ₁₁ , a thermistor PTC ₁₂ , and a thermistor PTC ₁₃ . One relay switch is connected in parallel to each thermistor.

In one embodiment of the present application, as shown in FIGS. 32 and 33, the drive control circuit is used to emit a surge signal in the first capacitive element C ₂ and in parallel with the first capacitive element C ₂ . Further includes a _second resistance element R2 to be connected.

In the embodiment, after the first capacitive element C ₂ absorbs the surge signal on the high voltage bus, the second capacitive element R ₂ is used to emit the surge signal in the first capacitive element C ₂ . The reliability of the drive control circuit is improved by providing the second resistance element R ₂ .

In one embodiment of the present application, as shown in FIGS. 32 and 33, the second capacitive element used to absorb the surge signal on the high voltage bus and connected in series with the first capacitive element _C2 . The element C ₃ is further included.

In the embodiment, when the voltage of the high voltage bus is large, the surge signal absorption capacity of the high voltage bus is improved by connecting the second capacitive element C ₃ in series to the first capacitive element C ₂ .

In one embodiment of the present application, as shown in FIGS. 32 and 33, a _second capacitive element C3 is used to emit a surge signal and is connected in parallel to the _second capacitive element C3. 3 The resistance element R ₃ is further included.

In the embodiment, when the second capacitive element C ₃ is provided, the first capacitive element C ₂ is provided by providing the third resistant element R ₃ and using it in combination with the second capacitive element R ₂ . And the voltage across the second capacitive element C ₃ is balanced, and the third resistant element R ₃ emits a surge signal on the second capacitive element C ₃ to improve the reliability of the drive control circuit. It is also used to make it.

In one embodiment of the present application, as shown in FIGS. 32 and 33, a fourth resistant element _R4 for limiting the current flowing through the first capacitive element C ₂ and / or the second capacitive element C ₃ is provided. Further included, the fourth resistant element R ₄ , the second switching element and the first capacitive element C ₂ are connected in series, or the fourth resistant element R ₄ , the second switching element, the first capacitive element C ₂ And the second capacitive element C ₃ are connected in series.

In the embodiment, a fourth resistant element R ₄ connected in series with the first capacitive element C ₂ and / or the second capacitive element C ₃ is provided, and the fourth resistant element R ₄ is used. By limiting the current flowing through the 1-capacitive element C ₂ and / or the 2nd capacitive element C ₃ , the first capacitive element and / or the second capacitive element and the resistance element connected in parallel are caused by an overcurrent. By preventing it from being destroyed, the reliability of the drive control circuit is improved.

In one embodiment of the present application, as shown in FIGS. 32 and 33, it is used to emit a spike voltage signal in the _first resistance element R1 and is connected in parallel to the _first resistance element R1. It further includes a first discharge element.

In the embodiment, the first discharge element is provided so that the first resistance element R ₁ absorbs the surge signal on the high voltage bus and then is connected in parallel to the first resistance element R ₁ . The reliability of the drive control circuit is improved by using the discharge element to emit the spike voltage signal generated in the first resistance element R ₁ and providing the first discharge element.

Further, as shown in FIG. 34, the first discharge element is a diode.

In one embodiment of the present application, as shown in FIG. 35, a third switching element is connected to a control chip, which collects a bus signal and controls the third switching element to turn on or on based on the bus signal. Used to turn it off.

In the technical means, the controllability of the first absorption path is realized by providing the third switching element, and the control chip controls the third switching element based on the magnitude relationship between the bus signal and the voltage threshold value. The control of absorption of the surge signal by the first capacitive element C ₂ is realized. By providing the third switching element, the controllability of the drive control circuit is improved, and the reliability of the drive control circuit is improved on the premise that the surge absorption capacity is improved.

29, 30, FIG. 31, FIG. 32, FIG. 33, FIG. 34, and FIG. 35, of which FIG. 35 is an embodiment of the installation position of the surge absorption circuit of FIG. 29 is a connection relationship that can be implemented in FIG. 35. The second switching element is controlled to turn on or off based on whether the current measuring element has collected an overcurrent signal.

In one embodiment of the present application, as shown in FIGS. 33 and 37, the set voltage includes a first voltage threshold V ₂ and a second voltage threshold V ₁ , and the control chip is specifically of a high voltage bus. When the voltage signal is greater than or equal to the first voltage threshold V ₂ or equally smaller than the second voltage threshold V ₁ , the second switching element is controlled to turn off, the third switching element is controlled to turn on, and the high voltage bus is used. When the voltage signal is greater than or equal to the second voltage threshold V ₁ , the second switching element and the third switching element are controlled and turned on, and when the voltage signal of the high voltage bus is smaller than the first voltage threshold V ₂ . It is used to control and turn off the second switching element and the third switching element.

In the technical means, 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 resistant element R are compared based on the comparison result. ₁ is controlled to absorb the surge signal. Specifically, when the voltage signal of the high voltage bus is larger than or equal to the first voltage threshold V ₂ and smaller than the second voltage threshold V ₁ , the second switching element is used. Controlled to turn off, controlled to turn on the third switching element, use the first capacitive element _C2 to absorb the surge signal, and the voltage signal of the high voltage bus is greater than or greater than the _second voltage threshold V1. Equally, the second and third switching elements are controlled and turned on to achieve a rapid absorption surge, and if the voltage on the high voltage bus is too high, the components of the drive control circuit will be destroyed. By avoiding, when the voltage signal of the high voltage bus is smaller than the first voltage threshold V ₂ , the second switching element and the third switching element are controlled and turned off, and the surge signal is absorbed by the bus capacitor. The service life of both the absorption path and the second absorption path components is extended, and the first voltage threshold V ₂ and the second voltage threshold V ₁ relate to the surge absorption capacity of the bus capacitor C ₁ and the drive control circuit.

In one embodiment of the present application, the drive control circuit further includes a rectifying bridge that rectifies an AC signal and outputs it as a bus signal, and the bus signal is output to a bus capacitor, an inverter bridge, and a load via a high voltage bus and a low voltage bus. Then, the control chip controls the ON state of the second switching element and the ON state of the third switching element based on the AC signal.

Specifically, the control chip controls the on state of the second switching element and the on state of the third switching element based on the correspondence between the AC signal and the voltage threshold, and the voltage threshold corresponds to the voltage threshold of the bus signal. Set.

As shown in FIGS. 33 and 37, when the drive control circuit is energized for the _first time, the switching element is turned off, and the input power charges the bus capacitor C1 via the inductance Lac, the filter circuit, the rectifying bridge, and the inductance Ldc. Further, the first capacitive element C ₂ and the second capacitive element C ₃ are charged via the unidirectional conducting element D ₁ , and the first resistant element R ₁ has a set bus voltage protection threshold and a second resistance value. It is related to the overcurrent characteristic of the switching element, and the selection of the fourth resistant element R ₄ and the first capacitive element C ₂ is related to the inductance of the first resistant element R ₁ , and the selection of the first resistant element R ₁ When is a non-inductive resistance, the fourth resistance element R ₄ , the first capacitive element C ₂ , and the first discharge element may not be used. A diode may be selected for the first discharge element, that is, discharge is performed by a diode connected in antiparallel, and the selection of the diode connected in antiparallel is the inductance and resistance value of the _first resistance element R1. Involved.

When the conducting element D ₁ is a diode, when the prototype operates normally, the voltage on the first capacitive element C ₂ and the second capacitive element C ₃ is maintained at the maximum value of the DC bus voltage, and the first resistance. The second switching element on the sex element _R1 is turned off, and the surge energy is mainly derived from the power input, the compressor winding when the operation is stopped due to the failure of the prototype, the inductance flyback on the AC / DC side, and the kinetic energy of the compressor. However, when there is a surge signal, the bus voltage is higher than the terminal voltage of the surge first capacitive element C ₂ and the second capacitive element C ₃ because the small capacity bus capacitor C ₁ cannot absorb a lot of energy. , The first capacitive element C ₂ and the second capacitive element C ₃ function, and the remaining energy flows into the bus capacitor C ₁ , the first capacitive element C ₂ and the second capacitive element C ₃ , and the surge energy. The high voltage bus voltage gradually rises as the voltage rises (the larger the capacitance of the _first capacitive element C ₂ and the second capacitive element C3, the slower the voltage rise of the high voltage bus). When the voltage bus voltage is higher than a certain set value (eg V ₁ is set to 720V in FIG. 37), the first resistant element R ₁ is inserted and the switching element is turned on by pulse width modulation or determination. Initially, the bus voltage is guaranteed to be as stable as possible when voltage appears on the high voltage bus. As the surge energy is absorbed, the bus voltage begins to drop and the switching element is turned off when it is below a certain set value (eg, V ₂ is set to 700 V in FIG. 37).

When the conducting element D ₁ is a switching element, both of the two switching elements are turned off when the prototype is energized, and the bus capacitor C ₁ operates during normal operation (first capacitive element C ₂ and first). The surge energy (of the ₂ capacitive element C3) is mainly derived from the power input, the compressor winding when the operation is stopped due to the failure of the prototype, the inductance flyback on the AC / DC side, and the kinetic energy of the compressor, and there is a surge voltage. In some cases, the small capacitance bus capacitor C ₁ (film capacitor) cannot absorb much energy, so when the voltage of the high voltage bus is higher than a certain fixed value (eg 680V), the first capacitive element C ₂ and the first The switching element of the two capacitive elements C ₃ is turned on, in which case almost all of the surge energy enters and is absorbed by the first capacitive element C ₂ and the second capacitive element C ₃ , and the bus voltage first drops. Then, when the voltage of the high voltage bus rises above a certain set value (for example, V ₁ is set to 720 V in FIG. 37), the first resistance element R ₁ may rise gradually. It is plugged in and the switching element begins to be turned on in a pulse width modulation or deterministic manner, ensuring that the bus voltage is as stable as possible when a surge voltage appears. As the surge energy is absorbed, the bus voltage begins to drop and the switching element is turned off when it is below a certain set value (eg, V ₂ is set to 700 V in FIG. 37).

In addition, Lac refers to the actual AC side inductance model and the inductance of the input power line, and includes the inductance and the resistance. In one embodiment of the present application, as shown in FIG. 36, the _fifth resistance element R5 is connected in parallel to the reactor Ldc to obtain the damping resistance of the system, thereby improving the stability of the system.

In addition, Lac or Ldc is EMC (Electromagnetic Compatibility, that is, the ability of a device or system that meets the operating requirements in an electromagnetic environment to not cause electromagnetic interference that cannot be tolerated by any device in the environment) harmonics. In the area where harmonics are required, Lac or Ldc may be present in the prototype, and Lac and Ldc may coexist. In areas where harmonics are not required, neither Lac nor Ldc exist, and the position of the Ldc in the topology circuit to deal with high frequency harmonics (if this is ignored, the Ldc inductor does not have to be used). The smaller Ldc ₂ is used and a small attenuation resistor is connected in parallel to the smaller Ldc ₂ in order to improve the stability of the system.

PTC is an abbreviation for Positive Temperature Cooperative, which means a positive temperature coefficient and broadly refers to a semiconductor material or component having a very large positive temperature coefficient. Generally, PTC refers to a positive temperature coefficient thermistor.

By using the conducting element D ₁ and the second switching element in combination, the bus voltage is realized to be lower than the set maximum voltage (for example, 720V), the stability of the drive control circuit is improved, and the conducting element D ₁ and the conduction element D 1 and the second switching element are used in combination. The capacitance and resistance value of the component in the path to which the second switching element belongs are reduced, and the cost is reduced.

The embodiment of the fourth aspect of the present application provides a controller including the drive control circuit of any one of the above, and since the controller includes the drive control circuit of any of the above embodiments, the embodiment of any of the above. It has all the beneficial effects of the drive control circuit and is omitted here.

An embodiment of a fifth aspect of the present application provides an air conditioner comprising a motor and a drive control circuit of any of the above technical means, the signal input end of the motor being connected to the drive control circuit and output from the drive control circuit. The drive signal generated is used to drive and operate the motor. Since the air conditioner includes the drive control circuit of any one of the above embodiments, it has all the beneficial effects of the drive control circuit of any of the above embodiments, and the description thereof is omitted here.

As shown in FIG. 38, an embodiment of the sixth aspect of the present application includes an inverter bridge used to drive and control the operation of a load and connected between a high voltage bus and a low voltage bus. A drive control circuit, which is used to absorb surge signals generated in the process of the drive control circuit driving and operating the load, and is connected between the transmission and distribution network and the load. Includes a reactor and a bus capacitor used to provide the starting voltage required to energize the load, also used to absorb surge signals, and connected to the bus line on the input side of the inverter bridge. The drive control circuit is used to absorb the surge signal on the bus line, and is used to control the absorption process of the surge signal of the resistance absorption circuit and the resistance absorption circuit connected in parallel to the bus capacitor. It is a fourth switching element used and connected in series with a resistance absorption circuit, and when the fourth switching element is turned on, the resistance absorption circuit absorbs the surge signal and the fourth switching element is turned off. In this case, the resistance absorption circuit further includes the fourth switching element that stops the absorption of the surge signal.

The drive control circuit according to the embodiment of the present application helps the bus capacitor absorb the surge signal on the bus by connecting the resistance absorption circuit in parallel with the bus capacitor, and also absorbs the resistance with the fourth switching element. By connecting the circuits in series, the absorption process of the surge signal of the resistance absorption circuit is controlled. Specifically, when the prototype operates normally, the maximum value of the bus voltage is much smaller than the bus voltage protection threshold (which can be set based on the actual situation), and it is not necessary to include a resistance absorption circuit. , The 4th switching element does not have to function, the surge energy is mainly derived from the power input, the motor winding when the operation is stopped due to the failure of the prototype, the inductance flyback on the AC / DC side, and the kinetic energy of the motor, and the surge signal. When the bus voltage rises rapidly and the bus voltage exceeds the protection threshold, the component is destroyed due to the limited surge capacity absorption of the small capacity bus capacitor (eg film capacitor or small capacity electrolytic capacitor). To protect the components (mainly components such as smart power modules and capacitors) from high voltage breakdown, the 4th switching element is turned on, the resistance absorption circuit begins to absorb the surge and the bus voltage rises. When it drops rapidly and the bus voltage is within a reasonable range (which can be set based on the actual situation), the fourth switching element is turned off and the resistance absorption circuit ends the surge absorption process at this stage. The drive control circuit according to the present application can effectively alleviate the situation where the surge signal is not well absorbed by the bus capacitor, and can improve the stability and reliability of the bus voltage.

In the first embodiment of the present application, the resistance absorption circuit is preferably used to absorb the surge signal and includes a fifth resistance element connected between the high voltage bus and the low voltage bus.

In this embodiment, the resistance absorption circuit includes a fifth resistance element, and the fifth resistance element is connected between the high voltage bus and the low voltage bus to absorb the surge signal on the bus. The resistance value and power of the fifth resistance element are related to the bus voltage protection threshold, the overcurrent characteristic of the fourth switching element, and the energy to be absorbed, and preferably one of the fifth resistance elements is connected in series. Alternatively, it may be a plurality of resistances, and the resistance may be an inductive resistance or a non-inductive resistance, and is not specifically limited here. By selecting the model number of the resistance, rapid absorption of the surge signal is realized and the bus voltage is rapid. The decline can be guaranteed.

In one embodiment of the present application, the fourth switching element is a power switch or relay, and the power switch or relay is used to control the absorption process of the surge signal of the resistance absorption circuit.

In another embodiment of the present application, the fourth switching element is a power switch or relay, specifically, as shown in FIGS. 39, 40, 41, 43, 44, 47 and 48. The fourth switching element is a power switch.

In one embodiment of the present application, the resistant absorption circuit is preferably used to discharge the spike voltage of the fifth resistant element and further includes a second discharge element connected in parallel to the fifth resistant element. ..

In this embodiment, the resistance absorption circuit further includes a second discharge element, and the second discharge element is connected in parallel to the fifth resistance element to form a spike voltage emission circuit of the fifth resistance element. , The fifth resistant element generates a spike voltage when the fourth switching element is turned off, preventing it from affecting the drive control circuit or destroying the component.

In another embodiment of the present application, the second discharge element is preferably a unidirectional conducting element. Specifically, as shown in FIG. 39, the second discharge element is a diode for discharging the spike voltage of the fifth resistance element, and the conduction direction of the diode is the direction of the current flowing through the fifth resistance element. The opposite is true.

In this embodiment, a diode connected in antiparallel provides a discharge circuit for the spike voltage of the fifth resistant element. The choice of diode is related to the inductance and resistance value of the fifth resistant element.

In another embodiment of the present application, the second discharge element is a combination of a unidirectional conduction element and a resistor connected in series. The unidirectional conduction element is an element having a unidirectional conduction characteristic, and is, for example, a diode.

In another embodiment of the present application, as shown in FIG. 40, preferably the second discharge element is used to discharge the spike voltage of the fifth resistant element and is connected in parallel to the fifth resistant element. Includes a third capacitive element.

In the embodiment, the second discharge element includes a third capacitive element, and the third capacitive element is connected in parallel to the fifth resistant element to form a discharge circuit having a spike voltage of the fifth resistant element. The selection of the third capacitive element is related to the inductance of the fifth resistant element, and specifically, there is a positive correlation between the capacitance of the third capacitive element and the inductance of the fifth resistant element. 5 The smaller the inductance of the resistant element, the smaller the capacitance of the third capacitive element.

In another embodiment of the present application, as shown in FIG. 41, preferably the second discharge device is used to limit the current flowing through the third capacitive element and is connected in series with the third capacitive element. The sixth resistance element is further included.

In this embodiment, the second discharge element further includes a sixth resistant element, the sixth resistant element is connected in series with the third capacitive element to limit the current flowing through the third capacitive element. Preferably, the third capacitive element is a capacitor and the sixth resistant element is a resistor, i.e., an RC resonant circuit connected in series is used to emit the spike voltage of the fifth resistant element.

The selection of the second discharge element is related to the inductance and the resistance value of the fifth resistance element, and when the inductance of the fifth resistance element is negligibly small or not, for example, one fifth resistance element or When it is composed of a plurality of non-inductive resistors connected in series, the second discharge element may not be used and the fifth resistance element may be used alone as the absorption element.

In another embodiment of the present application, preferably, the fifth resistant element comprises one or more resistances, and the plurality of resistances are connected in series.

In another embodiment of the present application, as shown in FIGS. 40, 42, 43 and 44, preferably the drive control circuit is used to limit the current on the resistant absorption circuit and the high voltage bus. Also includes thermistors connected to.

The thermistor is connected to a high voltage bus and acts primarily at the moment of energization to limit extraneous circuits on absorption resistance and is shorted when charging is complete. As long as the resistance value is a component with a positive temperature coefficient, any of them can be used as a thermistor.

In another embodiment of the present application, preferably, as shown in FIGS. 40, 42, 43 and 44, the drive control circuit is used to limit the process of absorbing surge signals on the thermistor's high voltage bus. Also included are relays connected in parallel to the thermistor.

In this embodiment, the drive control circuit further includes a relay connected in parallel to the thermistor and for controlling the current limiting process on the resistance absorption circuit by the thermistor.

In another embodiment of the present application, preferably, as shown in FIGS. 46, 47 and 48, the drive control circuit further comprises a plurality of thermistors for absorbing surge signals at the power input ends, specifically. The number of thermistors is three, which are described as PTC ₁ , PTC ₂ , and PTC ₃ , and each of the three is provided in each of the three AC three-phase lines.

Preferably, the drive control circuit further includes a plurality of relays, the number of relays corresponds one-to-one with the thermistor, specifically, the number of relays is three, and the three are PTC ₁ , PTC ₂ , PTC ₃ . They are connected in parallel to each of the thermistors and are used to control the absorption process of the surge signal of the thermistor.

Further, the positions of the fourth switching element and the resistance absorption circuit may be changed, and the positions are fixed in consideration of the fact that an IGBT (Insulated Gate Bipolar Transistor) is used, but the position is fixed. When a relay or the like is used as the switching element, the position may be exchanged with the fifth resistance element.

In one embodiment of the present application, preferably, the drive control circuit includes a control circuit (not shown) connected to a fourth switching element, and the control circuit collects a power supply signal of the drive control circuit to supply power. It is used to control the fourth switching element to be turned on or off based on the signal, and the feeding signal is a bus signal and an AC signal.

In the embodiment, the power supply signal of the drive control circuit is collected by the control circuit, and the fourth switching element is controlled to be turned on or off based on the power supply signal to control the absorption process of the surge signal of the resistance element. .. The feeding signal is a bus signal and / or an AC signal. Specifically, the AC signal is processed by the rectifying bridge to become a bus signal, and both the bus signal and the AC signal may be used as a determination condition for controlling the fourth switching element to turn it on or off.

The bus signal may be acquired by collecting the voltage after the rectifying bridge and before the reactor and / or the voltage after the reactor and before the inverter bridge, and the AC signal is the peak value of the AC input voltage and / or before the rectifying bridge. It is a voltage.

A power amplification circuit (not shown) is connected in series between the control circuit and the fourth switching element, and the control signal output from the control circuit is amplified by the power amplification circuit, so that the control circuit becomes the fourth. Can drive switching elements.

In any of the above embodiments, the bus capacitor is preferably a film capacitor.

For further explanation of the present application, the actual 6KW prototype is shown in FIGS. 38, 39, 40, 41, 42, 43, 44, 45, 46, 47 and 48. Set the parameters from the operation of.

Reactor Lac refers to the actual AC side inductance model and the inductance of the input power line, including the inductance and resistance, the AC side inductance used in the conventional model is 25 mH, 500 mΩ, and the inductance of the input power line is less than 10 mH or Equal (magnified numerically), the resistance is greater than or equal to 0.5Ω (the resistance of the conductor actually used is about 1.2Ω).

The reactor refers to an actual DC side inductance model, which includes inductance and resistance, and is 4.5 mH and 120 mΩ.

_R4 is the system attenuation resistance (less than or equal to 200Ω, 68Ω in the 16KW prototype is used and does not have to be used in practice), and the attenuation resistance _R4 is when the reactor is set to 4.5mH. It may not be added to the 6KW prototype and may not have a reactor and may not have an _R4 .

In addition, Lac or reactor exists because EMC harmonics are required, and in the area where harmonics are required, there is a possibility that Lac or reactor exists in the prototype, and further, there is a possibility that Lac and reactor coexist. There is also. In areas where harmonics are not required, there are no Lac or reactors, and in order to deal with high frequency harmonics (if this is ignored, no reactor or inductor may be used), the reactor of the topology circuit. The smaller reactor Ldc is used at the position, and the smaller inductance is preferable from the viewpoint of cost. For example, it is smaller than 2 mH, and it is the stability of the system that a small damping resistance is connected in parallel to the smaller Ldc. This is to improve.

Operation description: When the prototype is energized, the input voltage is rectified by the rectifying bridge and at the same time the bus capacitor is charged. In this case, the input voltage is within the normal setting range (150V to 264V) and does not exceed 294V. (The hardware protection voltage threshold is set to 800V, the software protection threshold is set to 720V, and the valid value of the corresponding AC input is 720 ÷ 1.414 ÷ 1.732 = 294V), the prototype operates normally, and the first The fourth switching element of the resistance absorbing element is not turned on.

When the prototype operates normally, the voltage on the bus capacitor fluctuates at a frequency that is 6 times the frequency of the AC input power, and the maximum value of the bus voltage during normal operation is 264 x 1.414 x 1.732 = 646V. The fourth switching element does not work because it is much smaller than the set protection threshold.

The surge energy is mainly derived from the power input, the motor winding when the operation is stopped due to the failure of the prototype, the inductance flyback on the AC / DC side, and the kinetic energy of the motor. Since the surge absorption capacity of the capacitor) is limited, the bus voltage rises rapidly.

To protect components (mainly components such as smart power modules and capacitors) from high voltage breakdown when the DC bus voltage is higher than the set threshold voltage V ₂ (here set to 720V and actually adjustable). In addition, the fourth switching element is turned on by the duty ratio method or the pulse wave method. At the same time, the motor may quickly reduce the frequency or stop the direct operation, and the motor utilizes the zero vector operation stop function (when the inductance of the motor itself or the counter electromotive force constant is small, the direct operation is stopped. May be).

When the DC bus voltage is lower _than the set threshold voltage V1 (here it is set to 700V and is actually adjustable), the fourth switching element is turned off and the surge absorption process at this stage is completed.

The embodiment of the seventh aspect of the present application provides a controller including the drive control circuit according to any one of the above embodiments, because the controller includes the drive control circuit according to any one of the above embodiments. It has all the technical effects of the drive control circuit described in any one of the above embodiments, and description thereof is omitted here.

An eighth embodiment of the present application provides an air conditioner comprising a motor and a drive control circuit according to any one of the above embodiments, the signal input end of the motor being connected to the drive control circuit and being output from the drive control circuit. The drive signal is used to drive and operate the motor. Since the air conditioner includes the drive control circuit or controller according to any one of the above embodiments, it has all the technical effects of the drive control circuit or controller according to any one of the above embodiments, and the description thereof is omitted here.

In the description of the present application, the term "plurality" refers to two or more, and unless there is a clear limitation, the orientation or positional relationship indicated by the terms "upper", "lower", etc. is described in the drawings. It is based on orientation or positional relationship, and only these are used for the sake of simplification of the description of the present application, and the device or element of interest must be in a particular orientation and be constructed or operated in a particular orientation. Neither indicates nor suggests this, and is therefore not understood as a limitation to the present application. The terms "connection", "attachment", "fixing", etc. should be understood in a broad sense, for example, "connection" may mean fixed connection or detachable connection. It may be connected, it may be connected integrally, it may be directly connected, or it may be indirectly connected via an intermediate inclusion. May be. A person skilled in the art can specifically understand the meaning of the term in the present application depending on the situation.

In the description of the present application, when the terms "one example", "some examples", "specific examples", etc. are used, the specific features, structures, materials or advantages described in the examples or examples. Is intended to be included in at least one example or example of the present application. In the present application, the exemplary description of the term does not necessarily cover the same embodiment or example. Moreover, the particular features, structures, materials or advantages described may be combined in any one or more embodiments or examples in a suitable manner.

The above is merely a preferred embodiment of the present application and is not intended to limit the present application, and for those skilled in the art, various changes and changes may be made to the present application. If corrections, equivalent replacements, improvements, etc. are made without departing from the spirit of the present application, all of them are included in the scope of protection of the present application.

Claims (32)

A drive control circuit used to output a drive signal and including an inverter bridge connected between a high voltage bus and a low voltage bus.

A reactor that is used to absorb surge signals generated in the process of driving and operating the load by the drive control circuit and is connected between the transmission and distribution network and the load.
A drive control circuit including a bus capacitor used to filter and remove a surge signal on a bus line and connected to the bus line on the input side of the inverter bridge. The drive control circuit according to claim 1, further comprising a first absorption circuit used for absorbing a surge signal on the bus line and connected between the bus capacitor and the inverter bridge. The first absorption circuit is
A resistance absorbing element used to absorb the surge signal and connected in parallel to the bus capacitor.
When the first switching element is used to adjust the absorption process of the surge signal of the resistance absorbing element and is connected in series with the resistance absorbing element, and the first switching element is turned on. The said resistance absorbing element includes the first switching element which stops the absorption of the surge signal when the resistance absorbing element absorbs the surge signal and the first switching element is turned off. Item 2. The drive control circuit according to Item 2. The resistance absorbing element is
A first resistor for absorbing the surge signal is included, the first resistor is connected in series with the first switching element, and the resistance value of the first resistor corresponds to a preset bus voltage protection threshold. And / or
The drive control circuit according to claim 3, wherein the resistance value of the first resistor corresponds to an overcurrent protection threshold value of the first switching element. The resistance absorbing element includes a first unidirectional conducting element connected in parallel with the first resistance.
The drive control circuit according to claim 4, wherein the conduction direction of the first unidirectional conduction element is opposite to the direction of the current flowing through the first resistance. Further included is a second absorption circuit for absorbing surge signals on the high voltage bus and the low voltage bus.
The second absorption circuit is
Capacitive absorption elements used to absorb the surge signal and connected in parallel to the bus capacitor
The drive control according to claim 1, further comprising a second unidirectional conduction element used for adjusting the absorption process of the surge signal of the capacitive absorption element and connected in series with the capacitive absorption element. circuit. The capacitive absorption element is
Includes at least one capacitor, or a plurality of the capacitors connected in series and / or in parallel.
The second absorption circuit is
The drive control circuit of claim 6, further comprising a second resistor used to absorb the surge signal in the capacitor and connected in parallel to the capacitor. The second absorption circuit is
The drive control circuit according to claim 7, further comprising a current limiting resistor used to limit the current flowing through the capacitive absorbing element and connected in series with the capacitive absorbing element. The drive control circuit according to any one of claims 1 to 8, further comprising a fourth resistor used to absorb an oscillation signal generated in the reactor and connected in parallel to the reactor. A sampling control circuit connected to the first switching element, which collects a feed signal of the drive control circuit and controls the first switching element based on the feed signal to turn it on or off. Including more control circuits,
The drive control circuit according to claim 3, wherein the power supply signal includes a power supply signal on the AC side of the drive control circuit and a power supply signal of the bus line. With the motor
The drive control circuit according to any one of claims 1 to 10 is included.
An air conditioner in which a signal input end of the motor is connected to the drive control circuit, and a drive signal output from the drive control circuit is used to drive and operate the motor. A drive control circuit used to drive and control the operation of a load and including an inverter bridge connected between a high voltage bus and a low voltage bus.
A reactor that is used by the drive control circuit to absorb surge signals generated in the process of driving and operating the load, and is connected between the transmission and distribution network and the load.
A bus capacitor used to provide the starting voltage required to energize the load, also used to absorb the surge signal, and connected to the bus line on the input side of the inverter bridge.
A first resistant element and a second switching element, the second switching element is set to control the first resistant element to absorb the surge signal, and the first resistant element and the first. The two switching elements are connected in series, and then the first resistance element and the second switching element connected in series between the high voltage bus and the low voltage bus.
With a unidirectional conduction element or a third switching element,
The first capacitive element, the unidirectional conducting element or the third switching element, is set to limit the absorption of surge signals on the high voltage bus by the first capacitive element, and the unidirectional conducting element. An element or a first capacitive element in which the third switching element and the first capacitive element are connected in series and then connected in series between the high voltage bus and the low voltage bus.
A drive control circuit including a control chip connected to the second switching element and controlling the operation of the first resistance element based on the magnitude relationship between the bus signal and the voltage threshold value. 12. The drive control circuit according to claim 12, further comprising a second resistant element used to emit a surge signal in the first capacitive element and connected in parallel to the first capacitive element. 13. The drive control circuit of claim 13, further comprising a second capacitive element used to absorb the surge signal on the high voltage bus and connected in series with the first capacitive element. The drive control circuit according to claim 14, further comprising a third resistant element used to emit a surge signal in the second capacitive element and connected in parallel to the second capacitive element. Further including a fourth resistant element for limiting the current flowing through the first capacitive element and / or the second capacitive element.
The fourth resistant element, the second switching element and the first capacitive element are connected in series, or the fourth resistant element, the second switching element, the first capacitive element and the second capacitive element. The drive control circuit according to claim 15, wherein the elements are connected in series. 12. The drive control circuit according to claim 12, further comprising a first discharge element used to emit a spike voltage signal in the first resistance element and connected in parallel to the first resistance element. The third switching element is connected to a control chip, and the control chip is used to collect a bus signal and control the third switching element to be turned on or off based on the bus signal. The drive control circuit described in. The voltage threshold includes a first voltage threshold and a second voltage threshold.
Specifically, when the bus signal is larger than or equal to the first voltage threshold value and smaller than the second voltage threshold value, the control chip controls and turns off the second switching element to turn off the third switching element. Control and turn it on
When the bus signal is greater than or equal to the second voltage threshold, the second switching element and the third switching element are controlled and turned on.
The drive control circuit according to claim 18, which is used to control and turn off the second switching element and the third switching element when the bus signal is smaller than the first set voltage. Further including a rectifying bridge that rectifies an AC signal and outputs it as the bus signal, the bus signal is output to the bus capacitor, the inverter bridge, and the load via the high voltage bus and the low voltage bus.
The drive control circuit according to claim 19, wherein the control chip controls an on state of the second switching element and an on state of the third switching element based on the AC signal. A controller comprising the drive control circuit according to any one of claims 12 to 20. With the motor
The drive control circuit according to any one of claims 12 to 20 is included.
An air conditioner in which a signal input end of the motor is connected to the drive control circuit, and a drive signal output from the drive control circuit is used to drive and operate the motor. A drive control circuit used to drive and control the operation of a load and including an inverter bridge connected between a high voltage bus and a low voltage bus.
A reactor that is used by the drive control circuit to absorb surge signals generated in the process of driving and operating the load, and is connected between the transmission and distribution network and the load.
A bus capacitor used to provide the starting voltage required to energize the load, also used to absorb the surge signal, and connected to the bus line on the input side of the inverter bridge.
A resistance absorption circuit used to absorb the surge signal in the bus line and connected in parallel to the bus capacitor.
A fourth switching element used to adjust the absorption process of the surge signal in the resistance absorption circuit and connected in series with the resistance absorption circuit, when the fourth switching element is turned on. , A fourth switching element, wherein the resistance absorption circuit stops absorbing the surge signal when the resistance absorption circuit absorbs the surge signal and the fourth switching element is turned off. Control circuit. The resistance absorption circuit is
23. The drive control circuit of claim 23, comprising a fifth resistant element used to absorb the surge signal and connected between the high voltage bus and the low voltage bus. The fourth switching element is a power switch or a relay.
The drive control circuit according to claim 24, wherein the power switch or the relay is used for adjusting the absorption process of the surge signal of the resistance absorption circuit. The resistance absorption circuit is
24. The drive control circuit of claim 24, further comprising a second discharge element used to discharge the spike voltage of the fifth resistant element and connected in parallel to the fifth resistant element. The second discharge element is a unidirectional conduction element, or the second discharge element includes a unidirectional conduction element and a resistor connected in series.
The drive control circuit according to claim 26, wherein the conduction direction of the unidirectional conduction element is opposite to the direction of the current flowing through the fifth resistance element. The second discharge element is
26. The drive control circuit of claim 26, comprising a third capacitive element used to discharge the spike voltage and connected in parallel to the fifth resistant element. The second discharge element is
28. The drive control circuit of claim 28, further comprising a sixth resistant element used to limit the current flowing through the third capacitive element and connected in series with the third capacitive element. The fifth resistance element is
The drive control circuit according to any one of claims 24 to 29, wherein the drive control circuit includes one or a plurality of resistances, and the plurality of resistances are connected in series. A controller comprising the drive control circuit according to any one of claims 23 to 30. With the motor
The drive control circuit according to any one of claims 23 to 30 is included.
An air conditioner in which a signal input end of the motor is connected to the drive control circuit, and a drive signal output from the drive control circuit is used to drive and operate the motor.

Images