JP2022528097A - Drive control circuit and air conditioner - Google Patents

Abstract

The present application provides a drive control circuit and an air conditioner, wherein the drive control circuit has a first capacitive element arranged to provide a starting voltage for the motor assembly and an input line of the first capacitive element. With a connected switching element, when the switching element is turned on, the power grid system charges the first capacitive element and the conduction time of the switching element is that of the first capacitive element. It has a positive correlation with the charging voltage. According to the technical means provided by the present application, it is not necessary to install relays and thermistors in the drive control circuit of the motor assembly, the hardware loss and power consumption of the switching element are reduced, and the circuit board layout area is saved. ..
[Selection diagram] Fig. 1

Description

This application was submitted to the Chinese Patent Office on April 30, 2019, with the application number 201910364817. The priority of the Chinese patent application, which is X and the name of the invention is "drive control circuit and air conditioner", is claimed, and all of the contents thereof are incorporated into the present application.
In addition, the present application claims the priority of a Chinese patent application submitted to the China Patent Office on April 30, 2019, with an application number of 2019103633079.7 and the title of the invention being "drive control circuit and air conditioner". However, it is incorporated into the present application by incorporating all of its contents.

The present application relates to a technical field of drive control, and specifically to a drive control circuit and an air conditioner.

Generally, in the power supply control system of the inverter air conditioner outdoor unit, it is necessary to control using one relay, and when the outdoor unit is started, it is necessary to control to close the relay, thereby outdoors by the relay. Provides a starting voltage to the machine's motor assembly.

In the related technique, the power supply control system using a relay has the following drawbacks.
(1) When power is supplied to the motor assembly by the relay, it is necessary to hold the power supply to the relay in order to close the power supply line, which increases the overall power consumption of the air conditioner.
(2) The volume of the relay is large and occupies a lot of space on the circuit board.
(3) It is necessary to add a thermistor to the relay separately for precharging.
(4) The contact impedance inside the relay is large, and the switch life is limited.

It should be noted that the discussion of the background art in the entire specification does not mean that the background art must be prior art known to those skilled in the art. The discussion of the prior art throughout the specification does not mean that the prior art must be widely known or constitute common sense in the art.

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

Therefore, the first aspect of the present application is to provide a drive control circuit.

A second aspect of the present application is to provide another drive control circuit.

A third aspect of the present application is to provide an air conditioner.

In view of this, a first aspect of the present application is a drive control circuit applied to an air conditioner comprising a motor assembly with a first capacitive element arranged to provide a starting voltage for the motor assembly. The power grid system charges the first capacitive element with a switching element connected to the input line of the first capacitive element, and when the switching element is turned on, the switching element of the first capacitive element is charged. The conduction time provides a drive control circuit that has a positive correlation with the charging voltage of the first capacitive element.

In the technical means, when the switching element is turned on, the power grid system charges the first capacitive element and controls the conductivity of the switching element so that the charging current of the first capacitive element is effective. The value can be controlled, and the impact on the power grid and the electric control panel when the circuit is connected to the power grid can be avoided.

Specifically, the drive control circuit may further include a fuse tube, a common mode inductor, a rectifier module, a switch power supply, a controller, and the controller starts operating when power is supplied from the switch power supply. By transmitting a drive pulse to the switching element and controlling the conductivity of the switching element by the drive pulse, the effective value of the charging current of the first capacitive element is controlled, and the duty ratio of the drive pulse is transmitted first. When the duty ratio is increased gradually from 1%, the duty ratio of the drive pulse finally reaches 100% and is maintained.

The drive pulse may be kept constant or may vary in magnitude. The higher the charging voltage of the first capacitive element, the more electrical energy is stored by the first capacitive element and the greater the amount of charge stored in both poles, so the switching element needs to have a longer conduction time. The slow charging of the first capacitive element is realized.

The drive pulse is transmitted to the switching element by the above method, and the switching element is controlled to be turned on according to the conduction time of the drive pulse, whereby the impact on the power grid and the electric control panel when the circuit is connected to the power grid. Can be avoided. Further, since the on-resistance of the switching element used in the technical means of the present application is very small and smaller than the contact impedance of the relay, the loss can be effectively reduced by using the switching element. Since the theoretical value of the service life of the switching element is unlimited and the actual service life is much longer than that of the relay, the frequency of replacement is low and the maintenance cost of the drive control circuit can be reduced. The volume of the switching element can be reduced by 80% or more compared to the relay, occupies less circuit board space, the thermistor can be omitted, and the circuit board space is saved compared to the method using the relay. Can also place integrated circuits that implement different functions.

By using the above drive control circuit, the internal space of the air conditioner can be saved, the power consumption of the air conditioner can be reduced, and the impact on the power grid and the electric control panel when the air conditioner is connected to the power grid can be avoided. Improve the safety of using the air conditioner and improve the user experience.

The first capacitive element may be one capacitor, or may be a plurality of capacitors connected in series or in parallel.

The switching transistor may be an IGBT (Insulated Gate Bipolar Transistor) type power transistor, or may be a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) or a metal oxide semiconductor power field effect transistor. good.

Further, according to the drive control circuit according to the above embodiment of the present application, it may have the following additional technical features.

In any of the above technical means, further, in the drive control circuit, the conduction time has a negative correlation with the withstand current of the power grid system, and the conduction time is the maximum voltage threshold of the power grid system. There is a positive correlation.

In the technical means, the conduction time of the switching element has a negative correlation with the withstand current of the power grid system, and the conduction time has a positive correlation with the maximum voltage threshold of the power grid system. When charging the first capacitive element, at the initial time of charging, there is no electromotive force difference between the two poles of the first capacitive element, or the electromotive force difference is small. At both poles, the amount of charge is small, the stored electrical energy is small, and when the power grid charges the first capacitive element, the instantaneous current value generated in the circuit is large, giving an impact to the power grid and the electric control panel. At this time, it is necessary to consider the load capacity of the power grid system for the conduction time of the switching element. The drive pulse is transmitted to the switching element by the above method, and the switching element is controlled to be turned on according to the conduction time of the drive pulse, whereby the impact on the power grid and the electric control panel when the circuit is connected to the power grid. Can be avoided.

In any of the above technical means, and further in the drive control circuit, the conduction time increases as the charging time of the first capacitive element increases.

In the technical means, the conduction time of the switching element increases as the charging time of the first capacitive element increases, and when charging the first capacitive element, the first capacitive at the initial time of charging. Since there is no difference in electromotive force between the two poles of the element, the instantaneous current value generated in the circuit is large, and the power grid and the electric control panel are impacted, the switching element provides a short conduction time for the initial staircase for charging the capacitive element. However, as the charging process progresses, the amount of charge on both poles of the first capacitive element continues to increase, and after the circuit is turned on, the impact on the power grid and the electrical control panel is reduced, so that the switching element The conduction time can be appropriately increased, the conduction state of the switching element is controlled by the drive pulse, and the drive pulse may be held in the same form, sometimes large and sometimes small.

The drive pulse is transmitted to the switching element by the above method, the switching element is controlled to be turned on according to the conduction time of the drive pulse, and the conduction time increases as the charging time of the first capacitive element increases. As a result, it is possible to avoid an impact on the power grid and the electric control panel when the circuit is connected to the power grid.

In any of the above technical means, further, the drive control circuit is connected between the power grid system and the first capacitive element, and an AC electric signal input from the power grid system is used as a DC electric signal. A rectifying module that converts to is further provided, and the DC electrical signal is arranged to charge the first capacitive element.

In the technical means, the drive control circuit is provided with a rectifying module, which is connected between the power network system and the first capacitive element to convert an AC electric signal input from the power network system into a DC electric signal. The DC electrical signal is arranged to charge the first capacitive element, and the rectifying module may have a rectifying bridge, wherein the rectifying bridge converts an AC signal into a DC signal and is an air conditioner. Normal operation of the electrical control system is guaranteed.

In any of the above technical means, further, the drive control circuit receives an AC electric signal input from the power grid system, and inputs the AC electric signal as an input line to the rectifier module. Further equipped with a line and a second AC line.

In the technical means, the drive control circuit includes a first AC line and a second AC line for receiving an AC electric signal input from the power network system, and the first AC line and the second AC line. Inputs an AC electrical signal to the rectifying module as an input line, and the rectifying module converts the AC electrical signal into a DC electrical signal, ensuring normal operation after the air conditioner is connected to the AC power network.

In any of the above technical means, further, the drive control circuit is connected between the first AC line and the second AC line, and a second capacitance for filtering the AC electric signal. Further equipped with a sex element.

In the technical means, the drive control circuit includes a second capacitive element connected between the first AC line and the second AC line to filter the AC electrical signal and filter out the DC signal. After that, the AC signal is input to the rectification module, and the normal operation of the rectification module is guaranteed.

The second capacitive element may be one capacitor, or may be a plurality of capacitors connected in series or in parallel.

In any of the above technical means, the drive control circuit is further connected to the input end of the first AC line and / or to the input end of the second AC line and the motor assembly. Is further equipped with a fuse tube that protects against overvoltage and overcurrent.

In the technical means, the drive control circuit is connected to the input end of the first AC line and / or to the input end of the second AC line, a fuse tube that protects the motor assembly from overvoltage and overcurrent. When an overvoltage and overcurrent phenomenon occurs, it prevents the internal device of the air conditioner from being damaged by the excessive current and voltage.

In any of the above technical means, further, in the drive control circuit, one inductor is connected in series in the first AC line, and the other inductor is connected in series in the second AC line. Further including a common mode inductor, the common mode inductor filters out common mode interference existing in the first alternating current line and the second alternating current line, and also filters out the first alternating current line and the second alternating current. Arranged to reduce electromagnetic interference generated in the line.

In the technical means, the drive control circuit comprises a pair of common mode inductors, one inductor in the common mode inductor is connected in series on the first AC line and the other inductor in the common mode inductor is the first. Connected in series on the 2 AC lines, the common mode inductor filters out the common mode interference present in the 1st AC line and the 2nd AC line and occurs in the 1st AC line and the 2nd AC line. Arranged to reduce electromagnetic interference, the normal operation of the air conditioner is guaranteed.

In any of the above technical means, the drive control circuit further comprises a third capacitive element connected between the common mode inductor and the fuse tube to filter the AC electrical signal. ..

In the technical means, the drive control circuit includes a third capacitive element connected between the common mode inductor and the fuse tube to filter the AC electrical signal, and the AC signal after the filtered out DC signal. Is input to the rectifying module, and normal operation of the rectifying module is guaranteed.

A second aspect of the present application provides another drive control circuit, wherein the drive control circuit comprises a first capacitive element arranged to provide a starting voltage for the motor assembly and the first capacitive. To the connection line between the second capacitive element and the first resistant element connected in series and connected to the input end of the element, and the first capacitive element and the second capacitive element. With a switching device to be connected, when the switching device is turned off, the power network system charges the second capacitive element via the first resistant element and the second capacitive element. While the element is being charged, the switching device is in the half-on state, and when the charging of the second capacitive element is completed, the switching device is in the full-on state, and the on-resistance of the switching device in the half-on state is the above. It is 100 times or more the on-resistance of the switching device in the full-on state, and the on-resistance of the switching device in the full-on state is at the milliohm level.

In the technical means, the drive control circuit is provided with a first capacitive element, in which the outdoor unit applies a starting voltage to the outdoor unit motor assembly when the air conditioner outdoor unit is started. Provided, the first capacitive element has a large capacitance and is usually arranged as an electrolytic capacitor, and the drive control circuit includes a second capacitive element and a first capacitive element connected in series, and a first one. Further, a switching device connected between the capacitive element and the second capacitive element is provided.

When the switching device is turned off, the first capacitive element is disconnected, the power grid system charges the second capacitive element through the first resistant element, and when the switching device is turned on. The power grid system charges the first capacitive element, and while the second capacitive element is being charged, the switching device is in the half-on state, and when the charging of the second capacitive element is completed, the switching When the device is in the full-on state, the on-resistance of the switching device in the half-on state is 100 times or more the on-resistance of the switching device in the full-on state, and the on-resistance of the switching device in the full-on state is at the milliohm level. Is.

By applying the technical means provided by the present application, when the switching device is in the half-on state in the process of charging the second capacitive element and the charging of the second capacitive element is completed, the said. The switching device is in the full-on state, and the on-resistance of the switching device in the half-on state is 100 times or more the on-resistance of the switching device in the full-on state, and the on-resistance of the switching device in the full-on state is milliohms. At the level, the drive control circuit described above is capable of achieving slow charging of the first capacitive element and after charging the second capacitive element, the on-resistance of the switching device is less than 10 milliohms. Compared to the 30 milliohms of the contact impedance of the relay, the switching device can reduce the circuit loss and power consumption, the life theoretical value of the switching device is unlimited, and the service life of the drive control circuit. And finally, the volume can be reduced by more than 80% compared to switching devices and relays, and there is no need to install a thermistor set for the relay, and the complexity of circuit design. Is simplified and hardware costs are eliminated.

Specifically, by installing the above-mentioned second capacitive element and the above-mentioned switching device, low-speed charging of the electrolytic capacitor (that is, the first capacitive element) is realized, for example, three poles as a switching device. Vacuum tubes or thyristors can be selected, no relays need to be used, and switching devices with low on-resistance such as switch tubes are used, further reducing relay hardware loss and power consumption, and driving control circuits. Improves service life.

Furthermore, since the switching device can be used by selecting a small-volume switch device such as a switching transistor, the volume is reduced as compared with the relay, and there is no need to separately install a thermista, so that the hardware cost is high. It saves, the circuit board layout area is also saved, the difficulty of circuit board placement is reduced, and the space utilization of the circuit board is optimized.

The first capacitive element is a starting capacitor of the motor assembly of the air conditioner outdoor unit, which is usually installed as an electrolytic capacitor, and the second capacitive element is connected in series with the first resistant element.

Since the on-resistance of the switching transistor is lower than 10 milliohms and significantly lower than the relay's 30 milliohms, the loss can be effectively reduced, and the volume of the switching transistor is reduced by 80% or more compared to the relay. , There is no need to install a thermistor, and the circuit board area is further saved. When the outdoor unit is turned on, the switching transistor closes and the power grid system charges the second capacitive element with the first resistant element.

In addition, the drive control circuit in the above technical means provided by the present application may further have the following additional technical features.

In the above technical means, further, the drive control circuit is connected in series with the first resistance element, arranged so as to divide the voltage with the first resistance element, and parallel to the second capacitive element. It further comprises a second resistance element connected.

In the technical means, the drive control circuit is provided with a second resistance element, the second resistance element is connected in series with the first resistance element, and the second resistance element is , Connected in parallel to the second capacitive element. As a result, the voltage division of the first resistance element is realized, and when the drive control circuit suddenly loses power or the power is turned off, the second capacitive element is discharged and divided, and at the same time, the second resistance is generated. The sex element can consume the discharge current of the second capacitive element, and the overcurrent is prevented from being generated in the drive control circuit.

In any of the above technical means, the drive control circuit is further connected in parallel to the second capacitive element and is arranged to limit the load voltage of the switching device below the voltage threshold. Further prepare.

In the technical means, the drive control circuit is provided with a Zener diode connected in parallel to the second capacitive element to limit the load voltage of the switching device, and when an overvoltage occurs in the drive control circuit, the load of the switching device is provided. When the voltage is higher than the voltage threshold it can withstand, the Zener diode is enabled, effectively reducing the load voltage of the switching device and providing overvoltage protection for the switching device.

In any of the above technical means, further, the drive control circuit is connected between the power grid system and the second capacitive element, and the AC electric signal input from the power grid system is converted into a DC electric signal. Further comprising a rectifying module for conversion, the DC electrical signal is arranged to charge the first capacitive element and / or the second capacitive element.

In the technical means, the drive control circuit is provided with a rectifying module, and after connecting the drive control circuit to the power grid system, the AC electric signal input from the power grid system is received, and the AC electric signal received by the rectifying module is received. Is rectified to obtain a DC electrical signal for charging the first capacitive element and / or the second capacitive element.

In any of the above technical means, further, the drive control circuit receives the AC electric signal input from the power grid system and inputs the AC electric signal as an input line to the rectifier module. And a second AC line is further provided.

In the technical means, the drive control circuit is provided with a first AC line and a second AC line as input lines from the power network system to the rectifying module, and the first AC line and the second AC line are It is connected to the power network system, receives the AC electric signal input from the power network system, transfers this AC electric signal to the rectifying module, rectifies the AC electric signal by the rectifying module, and / or the first capacitive element and / or Acquires a DC electrical signal for charging the second capacitive element.

In any of the above technical means, further, the drive control circuit is connected between the first AC line and the second AC line, and has a third capacitive to filter the AC electric signal. Further equipped with elements.

In the technical means, the drive control circuit is provided with a third capacitive element between the first AC line and the second AC line to filter the AC electrical signals provided by the power grid system and power grid. Eliminates the interference of miscellaneous waves in the system and improves the stability of the drive control circuit.

In any of the above technical means, the drive control circuit is further connected to the input end of the first AC line and / or to the input end of the second AC line to provide the motor assembly. Further provided with a fuse tube to protect against overvoltage and overcurrent.

In the technical means, the drive control circuit is provided with a fuse tube, which is installed at the input end of the first AC line and / or the second AC line, causing an overvoltage in the power network system. When the voltage or current exceeds the withstand threshold of the drive control circuit when the overcurrent or the like undulates, the fuse tube is burnt and blown, the overvoltage or overcurrent is separated from the outside of the drive control circuit, and the drive control circuit is overvoltage and Protection from overcurrent is realized.

The burn threshold of the fuse tube is lower than the voltage withstand threshold and the current withstand threshold of each device in the drive control circuit.

In any of the above technical means, further, the drive control circuit is a common in which one inductor is connected in series in the first AC line and the other inductor is connected in series in the second AC line. Further including a mode inductor, the common mode inductor filters out common mode interference existing in the first AC line and the second AC line, and also filters out the first AC line and the second AC line. It is arranged so as to reduce the electromagnetic interference generated in.

In the technical means, the drive control circuit is provided with a common mode inductor, the common mode inductor includes at least two inductors, the first inductor is connected in series on the first AC line, and the second inductor. Are connected in series in the second AC line, and the first inductor and the second inductor act in cooperation with each other to eliminate the common mode interference existing in the first AC line and the second AC line. It can improve the stability of the drive control circuit.

Specifically, the common mode inductor also reduces the electromagnetic interference generated in the first AC line and the second AC line, and further improves the stability and reliability of the drive control circuit.

In any of the above technical means, the drive control circuit further comprises a fourth capacitive element connected between the common mode inductor and the fuse tube to filter the AC electrical signal.

In the technical means, the drive control circuit is provided with a fourth capacitive element, the fourth capacitive element being connected between the common mode inductor and the fuse tube, and alternating current input from the power grid system. It filters electrical signals, reduces miscellaneous waves in AC electrical signals, and improves the stability and reliability of drive control circuits.

According to an embodiment of the third aspect of the present application, an air conditioner comprising a motor assembly and a drive control circuit arranged to control execution of the motor assembly according to the embodiment of the first aspect of the present application. I will provide a.

The third capacitive element may be one capacitor, or may be a plurality of capacitors connected in series or in parallel.

In the technical means, the air conditioner includes the drive control circuit in any of the above technical means, so that the air conditioner includes all the beneficial effects of the drive control circuit in any of the above technical means. Therefore, the explanation will not be repeated.

The above and / or additional aspects and advantages of the present application will be clarified and easy to understand by explaining the examples with reference to the drawings below.

It is a structural diagram which shows the drive control circuit which concerns on one Embodiment of this application. It is a structural diagram which shows the drive control circuit which concerns on another Embodiment of this application. It is a structural diagram which shows the drive control circuit which concerns on still another Embodiment of this application. It is a block diagram which shows the air conditioner which concerns on one Embodiment of this application.

In order to enable a clearer understanding of the above objectives, features and advantages of the present application, the present application will be described in more detail below in connection with drawings and specific embodiments. As long as there is no contradiction, the examples of the present application and the features according to the examples can be combined with each other.

Although many specific and detailed contents are described in the following description for a full understanding of the present application, the present application may be implemented in a form different from that described herein, and therefore the present application. The scope of protection of is not limited to the specific embodiments disclosed below.

Hereinafter, the drive control circuit and the air conditioner according to some embodiments of the present application will be described with reference to FIGS. 1 to 4.

Example 1
As shown in FIGS. 1 and 2, according to an embodiment of the first aspect of the present application, a drive control circuit applied to an air conditioner including a motor assembly is provided, and the drive control circuit is used to start the motor assembly. A first capacitive element C ₃ arranged to provide a voltage and a switching element Q connected to the input line of the first capacitive element C ₃ are provided, and the switching element Q is turned on. Then, the power grid system charges the first capacitive element C ₃ , and the conduction time of the switching element Q has a positive correlation with the charging voltage of the first capacitive element C ₃ .

In this embodiment, when the switching element Q is turned on, the power grid system charges the first capacitive element C ₃ and controls the conductivity of the switching element Q to control the first capacitive element C ₃ The effective value of the charging current can be controlled, and the impact on the power grid and the electric control panel when the circuit is connected to the power grid can be avoided.

Specifically, the drive control circuit further includes a fuse tube F, a common mode inductor L, a rectifier module BR, a switch power supply, and a controller. The controller starts operation when power is supplied from the switch power supply, transmits a drive pulse to the switching element Q, and controls the conductivity of the switching element Q by the drive pulse, so that the first capacitive element C The effective value of the charging current of ₃ is controlled.

The drive pulse gradually increases from the duty ratio of 1% when it is first transmitted, and finally the duty ratio of the drive pulse reaches 100% and is maintained. The drive pulse may be held in the same format, sometimes large and sometimes small. The higher the charging voltage of the first capacitive element C ₃ , the larger the electric energy stored by the first capacitive element C ₃ , and the larger the amount of charge stored in both poles, so that the switching element Q is longer. Must have conduction time.

The following provides a calculation method for calculating the conduction time of a drive pulse, and the technical means claimed in the present application is not limited to this method.

The formula for calculating the conduction time t of the initial drive pulse is as follows.

Here, _Ciss is a capacitance value between the gate and the source of the switching element, R ₁ is the resistance of the resistor R ₁ connected in series with the switching element, and E is the rated voltage of the drive switching element. It is usually 15 V, and V _t is a drive voltage value when the on resistance of the switching element is R _on .

Here, T is a switch pulse period, and the calculation formula for the next pulse conduction time t ₂ is as follows.

The drive pulse is transmitted to the switching element Q by the above method, and the switching element Q is controlled to be turned on according to the conduction time of the drive pulse, thereby to the power grid and the electric control panel when the circuit is connected to the power grid. Impact can be avoided. Further, since the on-resistance of the switching element Q used in the technical means of the present application is very small and smaller than the contact impedance of the relay, the loss can be effectively reduced by using the switching element Q, and switching can be performed. Since the theoretical value of the working life of the element Q is unlimited and the actual working life is much longer than that of the relay, the frequency of replacement is low, the maintenance cost of the drive control circuit can be reduced, and the switching element Q can be used. The volume can be reduced by more than 80% compared to the relay, occupies less circuit board space, the thermistor can be omitted compared to the alternative using the relay, and the saved circuit board space is separate. An integrated circuit that realizes the above functions can be arranged.

By using the above drive control circuit, the internal space of the air conditioner can be saved, the power consumption of the air conditioner can be reduced, and the impact on the power grid and the electric control panel when the air conditioner is connected to the power grid can be avoided. Improve the safety of using the air conditioner and improve the user experience.

Here, the switching element Q is the switching transistor, and the first capacitive element C ₃ may be one capacitor, or may be a plurality of capacitors connected in series or in parallel.

Further, according to the drive control circuit according to the above embodiment of the present application, it may have the following additional technical features.

In one embodiment of the present application, further, as shown in FIG. 1, in the drive control circuit, the conduction time has a negative correlation with the withstand current of the power grid system, and the conduction time is the power grid system. There is a positive correlation with the maximum voltage threshold of.

In this embodiment, the conduction time of the switching element Q has a negative correlation with the withstand current of the power grid system, and the conduction time has a positive correlation with the maximum voltage threshold of the power grid system. When charging the first capacitive element C3 _, at the initial time of charging, there is no electromotive force difference between the _two poles of the first capacitive element C3, or the electromotive force difference is small, so that the first capacitance Both poles of the sex element C ₃ have a small amount of charge, a small amount of stored electric energy, and when the power grid charges the first capacitive element C ₃ , the instantaneous current value generated in the circuit is large, and the power grid and electricity. An impact is applied to the control panel, and at this time, the conduction time of the switching element Q needs to consider the load capacity of the power grid system.

The following provides a calculation method for calculating the drive pulse conduction time, and the technical means claimed in the present application is not limited to this method.

The formula for calculating the conduction time t of the initial pulse is as follows.

Here, T is a switch pulse period, and the calculation formula for the next pulse conduction time t ₂ is as follows.

In one embodiment of the present application, further, as shown in FIG. 1, in the drive control circuit, the conduction time increases as the charging time of the _first capacitive element C3 increases.

In this embodiment, the conduction time of the switching element Q increases as the charging time of the first capacitive element C ₃ increases, and when the first capacitive element C ₃ is charged, at the initial time of charging, the first There is no difference in electromotive force between the _two poles of the capacitive element C3 of 1, and the instantaneous current value generated in the circuit is large, which gives an impact to the power network and the electric control panel. Q provides a short conduction time, and as the charging process progresses, the amount of charge on both poles of the first capacitive element continues to increase, reducing the impact on the power network and electrical control panel after the circuit is turned on. Therefore, the conduction time of the switching element Q can be appropriately increased, the conduction state of the switching element Q is controlled by the drive pulse, and the drive pulse may be held in the same form, sometimes large. Sometimes it may be in a smaller format.

The following provides a calculation method for calculating the drive pulse conduction time, and the technical means claimed in the present application is not limited to this method.

The formula for calculating the conduction time t of the initial pulse is as follows.

In one embodiment of the present application, further, as shown in FIG. 1, the drive control circuit is connected between the power grid system and the first capacitive element C3 _, and is an alternating current input from the power grid system. Further, a rectifying module BR for converting an electric signal into a DC electric signal is provided, and the DC electric signal is arranged so as to charge the _first capacitive element C3.

In the above embodiment, the drive control circuit is provided with a rectifying module BR, which is connected between the power network system and the first capacitive element C3 _, and converts an AC electric signal input from the power network system into a DC electric signal. The DC electrical signal is arranged so as to charge the _first capacitive element C3, and the rectifying module BR may have a rectifying bridge, which converts the AC signal into a DC signal. However, the normal operation of the electric control system of the air conditioner is guaranteed.

In one embodiment of the present application, further, as shown in FIG. 1, the drive control circuit receives an AC electric signal input from the power grid system and transfers the AC electric signal to the rectifying module BR as an input line. A first AC line and a second AC line for input are further provided.

In the embodiment, the drive control circuit includes a first AC line and a second AC line for receiving an AC electric signal input from the power network system, and the first AC line and the second AC line are , The AC electric signal is input to the rectifying module BR as an input line, and the rectifying module BR converts the AC electric signal into a DC electric signal, and normal operation is guaranteed after the air conditioner is connected to the AC power network.

In one embodiment of the present application, further, as shown in FIG. 1, the drive control circuit is connected between the first AC line and the second AC line, and filters the AC electric signal. A second capacitive element C ₂ is further provided.

In this embodiment, the drive control circuit includes a _second capacitive element C2 connected between the first AC line and the second AC line to filter the AC electrical signal and filter out the DC signal. The AC signal after the AC signal is input to the rectifying module BR, and the normal operation of the rectifying module BR is guaranteed. Among them, the second capacitive element C ₂ may be a capacitor.

In one embodiment of the present application, further, as shown in FIG. 1, the drive control circuit is connected to the input end of the first AC line and / or to the input end of the second AC line. Further include a fuse tube F that protects the motor assembly from overvoltage and overcurrent.

In this embodiment, the drive control circuit is connected to the input end of the first AC line and / or to the input end of the second AC line, a fuse tube that protects the motor assembly from overvoltage and overcurrent. Including F, when an overvoltage and an overcurrent phenomenon occurs, the excessive current and voltage prevent the internal device of the air conditioner from being damaged.

In one embodiment of the present application, further, as shown in FIG. 1, in the drive control circuit, one inductor is connected in series to the first AC line, and the other inductor is connected to the second AC line. Further including a common mode inductor L connected in series, the common mode inductor L filters out common mode interference existing in the first AC line and the second AC line, and also filters out the common mode interference existing in the first AC line and the first AC line. And are arranged so as to reduce the electromagnetic interference generated in the second AC line.

In this embodiment, the drive control circuit includes a common mode inductor L installed in pairs, one inductor in the common mode inductor L is connected in series to the first AC line, and another inductor in the common mode inductor L. Is connected in series to the second AC line, in which the common mode inductor filters out the common mode interference existing in the first AC line and the second AC line, and the first AC line and the second AC line. It is arranged so as to reduce the electromagnetic interference generated in the AC line of the AC line, and the normal operation of the air conditioner is guaranteed.

In one embodiment of the present application, further, as shown in FIG. 1, the drive control circuit is connected between the common mode inductor L and the fuse tube F, and a third AC electric signal is filtered. A capacitive element C ₁ is further provided.

In this embodiment, the drive control circuit includes a _third capacitive element C1 connected between the common mode inductor L and the fuse tube F to filter the AC electrical signal, after the filtered out DC signal. The AC signal is input to the rectifying module BR, and the normal operation of the rectifying module BR is guaranteed.

As shown in FIG. 2, in one embodiment of the present application, the protection resistor _R2 can be further connected in parallel to both ends of the switching element, and the Zener diode D and the protection capacitor C ₄ are the reliability of the circuit. To improve.

Example 2
As shown in FIG. 3, according to an embodiment of the second aspect of the present application, another drive control circuit 204 is provided, the drive control circuit 204 is arranged to provide a starting voltage for the motor assembly. A first capacitive element C ₃ , a second capacitive element C ₄ connected in series connected to an input end of the first capacitive element C ₃ , and a first resistant element R ₁ . A switching device Q connected to a connection line between the first capacitive element C ₃ and the second capacitive element C ₄ is provided, and when the switching device Q is cut off, a power network system is provided. Charges the second capacitive element C ₄ via the first resistant element R ₁ , and while the second capacitive element C ₄ is being charged, the switching device Q is in a half-on state. When the charging of the second capacitive element C ₄ is completed, the switching device Q is in the full-on state, and the on-resistance of the switching device Q in the half-on state is that of the switching device Q in the full-on state. It is 100 times or more the on-resistance, and the on-resistance of the switching device Q in the fully-on state is at the milliohm level.

In the embodiment, the drive control circuit 204 is provided with the _first capacitive element C3 _, and the first capacitive element C3 is the motor of the outdoor unit when the outdoor unit is started. It provides a starting voltage to the assembly, in which the first capacitive element C ₃ has a large capacitance and is usually arranged as an electrolytic capacitor, and the drive control circuit 204 has a second capacitive element C connected in series. A switching device Q connected between the ₄ and the first capacitive element R ₁ and between the first capacitive element C ₃ and the second capacitive element C ₄ is further provided.

When the switching device Q is cut off, the first capacitive element C ₃ is disconnected, the power grid system Q charges the second capacitive element C ₄ via the first resistant element, and the switching device Q When is turned on, the power grid system charges the first capacitive element C3, and while the _second capacitive element _C4 is being charged, the switching device Q is in the half-on state and the second capacitive element C4. When the charging of the capacitive element C ₄ is completed, the switching device Q is in the full-on state, and the on-resistance of the switching device Q in the half-on state is 100 times the on-resistance of the switching device Q in the full-on state. As described above, the on-resistance of the switching device Q in the full-on state is at the milliohm level.

By applying the technical means provided by the present application, in the process of charging the second capacitive element C ₄ , the switching device Q is in a half-on state, and the second capacitive element C ₄ is charged. Is completed, the switching device Q is in the full-on state, and the on-resistance of the switching device Q in the half-on state is 100 times or more the on-resistance of the switching device Q in the full-on state. The on-resistance of the switching device Q in the above is at the milliohm level, and the above drive control circuit can realize low-speed charging of the first capacitive element C ₃ and charge the second capacitive element C ₄ . After that, the on-resistance of the switching device Q is lower than 10 milliohms, and the switching device Q can reduce the circuit loss and power consumption as compared with the contact impedance of the relay of 30 milliohms, and the switching device Q can also be used. The theoretical lifespan of is unlimited, which can further improve the lifespan of the drive control circuit, and finally, the switching device Q can be reduced in volume by more than 80% compared to the relay, and the relay. There is no need to install a thermistor set according to the above, the complexity of circuit design is simplified, and the hardware cost is eliminated.

On the other hand, since the switching device Q can select and use a small-volume switch device such as a switching transistor, the volume is reduced as compared with the relay, and there is no need to separately install a thermista, so that the hardware cost is high. It saves, the circuit board layout area is also saved, the difficulty of circuit board placement is reduced, and the space utilization of the circuit board is optimized.

Specifically, by installing the above-mentioned second capacitive element C ₄ and the above-mentioned switching device Q, low-speed charging of the electrolytic capacitor (that is, the first capacitive element C ₃ ) is realized, for example. A triode vacuum tube or thyristor can be selected as the switching device, there is no need to use a relay, and a switching device Q with low on-resistance such as a switching transistor is used, so the hardware loss and power consumption of the relay are further reduced. This improves the service life of the drive control circuit 204.

Furthermore, since the switching device Q can be used by selecting a small-volume switch device such as a switching transistor, the volume is reduced as compared with the relay, and there is no need to separately install a thermistor, so that the hardware cost Is saved, the circuit board layout area is also saved, the difficulty of arranging the circuit board is reduced, and the space utilization of the circuit board is optimized.

Since the on-resistance of the switching transistor is lower than 10 milliohms and significantly lower than the relay's 30 milliohms, the loss can be effectively reduced, and the volume of the switching transistor is reduced by 80% or more compared to the relay. , There is no need to install a thermistor, and the circuit board area is further saved. When the outdoor unit is turned on, the switching transistor closes and the power grid system charges the second capacitive element C ₄ via the first resistance element R ₁ .

The switching transistor may be an IGBT (Insulated Gate Bipolar Transistor) type power transistor, or may be a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) or a metal oxide semiconductor power field effect transistor. good.

In one embodiment of the present application, further, as shown in FIG. 1, the drive control circuit 204 is connected in series to the first resistance element R ₁ and divides the voltage with the first resistance element R ₁ . Further includes a _second resistance element R2 arranged in the second capacitive element _C4 and connected in parallel to the second capacitive element C4.

In the embodiment, the drive control circuit 204 is provided with the _second resistance element R2, and the second resistance element _R2 is connected in series to the first resistance element R1 and is connected to the _first resistance element R1. The resistance element R ₂ of 2 is connected in parallel to the second capacitive element C ₄ . As a result, the voltage division of the first resistance element R ₁ is realized, and when the drive control circuit suddenly loses power or the power is turned off, the second capacitive element C ₄ is discharged and divided at the same time. The second resistance element R ₂ can consume the discharge current of the second capacitive element C ₄ , and prevents an overcurrent from being generated in the drive control circuit 204.

In one embodiment of the present application, further, as shown in FIG. 1, the drive control circuit 204 is connected in parallel to the second capacitive element _C4 , and the load voltage of the switching device Q is lower than the voltage threshold value. It further comprises a Zener diode D arranged to limit.

In this embodiment, the drive control circuit 204 is provided with a Zener diode D which is connected in parallel to the second capacitive element _C4 and limits the load voltage of the switching device Q, and when an overvoltage occurs in the drive control circuit 204. When the load voltage of the switching device Q is higher than the voltage threshold that it can withstand, the Zener diode D is enabled, the load voltage of the switching device Q is effectively reduced, and the overvoltage protection of the switching device Q is realized. ..

Specifically, the Zener diode D can guarantee that the voltage across the switching device Q is lower than 20V.

In one embodiment of the present application, further, as shown in FIG. 1, the drive control circuit 204 is connected between the power network system and the second capacitive element _C4 , and is an alternating current input from the power network system. Further comprising a rectifying module BR that converts an electrical signal into a DC electrical signal, the DC electrical signal is arranged to charge the first capacitive element C3 and / or the _second capacitive element _C4 . To.

In the embodiment, the drive control circuit 204 is provided with a rectifier module BR, and after connecting the drive control circuit to the power network system, the AC electric signal input from the power network system is received, and the AC received by the rectifier module BR is received. The electrical signal is rectified to obtain a DC electrical signal that charges the first capacitive element C3 and / or the _second capacitive element _C4 .

In one embodiment of the present application, further, as shown in FIG. 1, the drive control circuit 204 receives an AC electric signal input from the power grid system and transfers the AC electric signal to the rectifying module BR as an input line. A first AC line and a second AC line for input are further provided.

In the embodiment, the drive control circuit 204 is provided with a first AC line and a second AC line as input lines from the power network system to the rectifying module BR, and the first AC line and the second AC line are provided. Is connected to the power network system, receives the AC electric signal input from the power network system, transfers this AC electric signal to the rectifying module BR, rectifies the AC electric signal by the rectifying module BR, and is the first capacitive element. Acquires a DC electrical signal for charging C ₃ and / or the second capacitive element C ₄ .

In one embodiment of the present application, further, as shown in FIG. 1, the drive control circuit 204 is connected between the first AC line and the second AC line, and filters the AC electric signal. A third capacitive element C ₂ is further provided.

In this embodiment, the drive control circuit 204 is provided with a third capacitive element C2 between the first AC line and the _second AC line to filter the AC electrical signal provided by the power grid system. It eliminates the interference of miscellaneous waves in the power grid system and improves the stability of the drive control circuit 204.

In one embodiment of the present application, further, as shown in FIG. 1, the drive control circuit 204 is connected to the input end of the first AC line and / or to the input end of the second AC line. Further include a fuse tube F that protects the motor assembly from overvoltage and overcurrent.

In this embodiment, the drive control circuit 204 is provided with a fuse tube F, which is installed at the input end of the first AC line and / or the second AC line, and an overvoltage is generated in the power network system. However, when the voltage or current exceeds the withstand threshold of the drive control circuit 204 when the overcurrent or the like undulates, the fuse tube F is burnt and cut, and the overvoltage or overcurrent is separated from the outside of the drive control circuit 204 and driven. It is realized that the control circuit 204 is protected from overvoltage and overcurrent. Among them, the burnout threshold value of the fuse tube F is lower than the voltage withstand threshold value and the current withstand threshold value of each device in the drive control circuit 204.

In one embodiment of the present application, further, as shown in FIG. 1, in the drive control circuit 204, one inductor is connected in series to the first AC line, and the other inductor is connected to the second AC line. Further including a common mode inductor L connected in series, the common mode inductor L filters out common mode interference existing in the first AC line and the second AC line, and also filters out the common mode interference existing in the first AC line and the first AC line. And are arranged so as to reduce the electromagnetic interference generated in the second AC line.

In this embodiment, the drive control circuit 204 is provided with a common mode inductor L, the common mode inductor L includes at least two inductors, in which the first inductor is connected in series to the first AC line. , The second inductor is connected in series to the second AC line, and the first inductor and the second inductor are present in the first AC line and the second AC line by acting in cooperation with each other. Common mode interference can be eliminated and the stability of the drive control circuit 204 is improved.

Specifically, the common mode inductor L also reduces electromagnetic interference generated in the first AC line and the second AC line, and further improves the stability and reliability of the drive control circuit 204.

In one embodiment of the present application, further, as shown in FIG. 1, the drive control circuit 204 is connected between the common mode inductor L and the fuse tube F, and a fourth AC electric signal is filtered. A capacitive element C ₁ is further provided.

In this embodiment, the drive control circuit 204 is provided with a fourth capacitive element, the fourth capacitive element C ₁ is connected between the common mode inductor L and the fuse tube F, and is input from the power grid system. The generated AC electric signal is filtered, further, the miscellaneous waves in the AC electric signal are reduced, and the stability and reliability of the drive control circuit 204 are improved.

The power grid system is connected to the fourth capacitive element C1 by the neutral wire terminal N _- NI and the phase wire terminal L-IN.

In one embodiment of the present application, further, as shown in FIG. 1, after the air conditioner is turned on, the AC electric signal provided by the streetcar (power grid system) is the fuse tube F, the common mode inductor L, and the rectifier module BR. After passing through, it is converted into a DC electric signal. At this time, since the switching device Q is turned off, the first capacitive element C ₃ is not charged.

The second capacitive element C ₄ is charged by the first resistance element R ₁ and controls the capacitance value magnitude of the second capacitive element C ₄ and the resistance magnitude of the first resistance element R ₁ . Thereby, the charging speed of the first capacitive element C ₃ can be controlled.

The derivation process based on the formula for calculating the charge / discharge time of the capacitive element is as follows.

V ₀ is the initial voltage value in the second capacitive element C ₄ , V _u is the final voltage value after the second capacitive element C ₄ is charged, and V _t is an arbitrary time t. Assuming that the voltage value in the second capacitive element _C4 is V _t = V ₀ + (V _u −V ₀ ) × [1-exp (−t / (R × C))].

Here, R is the resistance value of the first resistance element R ₁ , and C is the capacitance value of the second capacitive element C ₄ . If the initial voltage value of the second capacitive element C ₄ is 0, the final voltage value after charging becomes E, that is, when V ₀ = 0 and V _u = E, any The voltage at the second capacitive element _C4 at time t is V _t = E × [1-exp (−t / (R × C))], t = R × C × Ln [E / (. EV _t )].

Therefore, it is possible to adjust the charging time of the first capacitive element C ₃ by adjusting the capacitance value of the second capacitive element C ₄ and the resistance magnitude of the first resistant element R ₁ . And low speed charging is realized.

When the switching device Q is turned on to the on-resistance of 5 ohms (the impact current of the power grid system is set to be less than 60A), the change range of the drive voltage is small, and the resistance of the switching device Q is as follows. Get with an expression.

R _mos = [(U-U ₁ ) / (U ₂ -U ₁ )] / (R ₂ -R ₁ ) + R ₁

Here, U ₁ is the drive voltage value at the moment when the switching transistor is turned on, U is the real-time voltage value of the switching transistor, and at this time, the on-resistance is the first resistance element R ₁ and. The on-resistance of U ₂ is the drive voltage value when the second resistance element R ₂ (R ₂ is 5 ohms), and the voltage in the first capacitive element C ₃ is U _{c 3} = E ×. [1-exp (-t / (R _mos × C ₃ ))].

As shown in FIG. 4, in the embodiment of the second aspect of the present application, the motor assembly 202 is arranged so as to control the execution of the motor assembly 202 and the motor assembly 202 described in the embodiment of the first aspect of the present application. Provided is an air conditioner 200 including a drive control circuit 204.

In this embodiment, since the air conditioner 200 includes the drive control circuit 204 described in any of the above technical means, the air conditioner 200 is all useful of the drive control circuit 204 described in any of the above technical means. Has a positive effect. Therefore, the explanation will not be repeated.

The technical means of the present application have been described in detail with reference to the accompanying drawings. In related techniques, power supply control usually needs to be performed via relays, which consume more energy and occupy more circuit boards, requires the cooperation of additional devices, and take into account issues such as high replacement costs. Therefore, the present application presents a drive control circuit and an air conditioner that can partially overcome the above technical defects.

In the description of the present specification, the term "plurality" refers to two or more unless otherwise defined, and the orientation or positional relationship indicated by terms such as "upper" and "lower" is shown based on the drawings. An orientation or positional relationship, used only to facilitate or simplify the description of the present application, indicating that the device or set shown always has a particular orientation and has a particular orientation structure and operation. Or it should be understood that it is not implied and therefore should not be considered a regulation to the present application. The meaning of the terms "connection", "attachment", "fixed", etc. should be widely understood, for example, "connection" can be fixed continuous or unloadable connection. , Or may be integrally connected, or may be electrically connected, and "connecting" can be directly connected or indirectly connected via an intermediate medium. be. Those skilled in the art can understand the specific meanings of the above terms in the present application according to the specific circumstances.

In the description of the present specification, the descriptions such as the terms "one example", "several examples", and "concrete examples" are the specific features and structures described in the examples or examples. , Materials or features, are intended to be included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. In addition, the specific features, structures, materials or features described may be combined in any one or more embodiments or embodiments in any manner appropriate.

The above is merely a preferred embodiment of the present application, and is not intended to limit the present application. Any person skilled in the art can make various changes or modifications in the present application. Any modifications, equal replacements, improvements, etc. made without departing from the spirit and principles of the present application shall be within the scope of protection of the present application.

Claims (19)

A drive control circuit applied to air conditioners equipped with a motor assembly.
With a first capacitive element arranged to provide the starting voltage of the motor assembly,
A switching element connected to the input line of the first capacitive element is provided.
When the switching element is turned on, the power grid system charges the first capacitive element, and the conduction time of the switching element is positively correlated with the charging voltage of the first capacitive element. Drive control circuit. The conduction time has a negative correlation with the withstand current of the power grid system, and the conduction time has a positive correlation with the maximum voltage threshold of the power grid system.
The drive control circuit according to claim 1. The conduction time increases as the charging time of the first capacitive element increases.
The drive control circuit according to claim 1. Further comprising a rectifying module connected between the power grid system and the first capacitive element and converting an AC electrical signal input from the power grid system into a DC electrical signal.
The DC electrical signal is arranged to charge the first capacitive element.
The drive control circuit according to any one of claims 1 to 3. A first AC line and a second AC line that receive an AC electric signal input from the power grid system and input the AC electric signal to the rectifying module as an input line are further provided.
The drive control circuit according to claim 4. A second capacitive element connected between the first AC line and the second AC line and filtering the AC electric signal is further provided.
The drive control circuit according to claim 5. Further comprising a fuse tube connected to the input end of the first AC line and / or the input end of the second AC line to protect the motor assembly from overvoltage and overcurrent.
The drive control circuit according to claim 6. Further comprising a common mode inductor in which one inductor is connected in series on the first AC line and the other inductor is connected in series on the second AC line.
The common mode inductor filters out the common mode interference existing in the first AC line and the second AC line, and also suppresses the electromagnetic interference generated in the first AC line and the second AC line. Arranged to reduce,
The drive control circuit according to claim 7. Further comprising a third capacitive element connected between the common mode inductor and the fuse tube and filtering the AC electrical signal.
The drive control circuit according to claim 8. A drive control circuit applied to air conditioners equipped with a motor assembly.
With a first capacitive element arranged to provide the starting voltage of the motor assembly,
A second capacitive element and a first resistant element connected in series, which are connected to the input end of the first capacitive element,
A switching device connected to a connection line between the first capacitive element and the second capacitive element is provided.
When the switching device is turned off, the power grid system charges the second capacitive element via the first resistant element, and while the second capacitive element is being charged, the switching device is charged. When the second capacitive element is fully charged in the half-on state, the switching device is in the full-on state.
The on-resistance of the switching device in the half-on state is 100 times or more the on-resistance of the switching device in the full-on state, and the on-resistance of the switching device in the full-on state is a milliohm level. A second resistance element connected in series to the first resistance element, arranged so as to divide the voltage from the first resistance element, and connected in parallel to the second capacitive element is further provided.
The drive control circuit according to claim 10. Further comprising a Zener diode connected in parallel to the second capacitive element and arranged to limit the load voltage of the switching device below the voltage threshold.
The drive control circuit according to claim 10. Further comprising a rectifying module connected between the power grid system and the second capacitive element and converting an AC electrical signal input from the power grid system into a DC electrical signal.
The DC electrical signal is arranged to charge the first capacitive element and / or the second capacitive element.
The drive control circuit according to any one of claims 10 to 12. 13. The drive according to claim 13, further comprising a first AC line and a second AC line that receive an AC electric signal input from the power grid system and input the AC electric signal to the rectifier module as an input line. Control circuit. A third capacitive element connected between the first AC line and the second AC line and filtering the AC electric signal is further provided.
The drive control circuit according to claim 14. 15. The drive control according to claim 15, further comprising a fuse tube connected to the input end of the first AC line and / or the input end of the second AC line to protect the motor assembly from overvoltage and overcurrent. circuit. Further comprising a common mode inductor in which one inductor is connected in series on the first AC line and the other inductor is connected in series on the second AC line.
The common mode inductor filters out common mode interference existing in the first AC line and the second AC line, and reduces electromagnetic interference generated in the first AC line and the second AC line. Arranged to do,
The drive control circuit according to claim 16. Further comprising a fourth capacitive element connected between the common mode inductor and the fuse tube and filtering the AC electrical signal.
The drive control circuit according to claim 17. With the motor assembly,
The air conditioner comprising the drive control circuit according to any one of claims 1 to 18, which is arranged to control the execution of the motor assembly.

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