Drive control circuits and home appliances

Abstract

The present invention provides a driving control circuit and household appliance, wherein the driving control circuit includes: a voltage absorption compensation branch connected in parallel with an inverter, the voltage absorption compensation branch includes a capacitive element and a switch device connected in series, the switch device is configured to control the capacitive element to charge or discharge, wherein the capacitive element discharges to perform voltage compensation on the inverter, and the inverter is configured to drive the load to operate. By applying the technical solution provided by the present invention, voltage compensation is also achieved through the capacitive element when the voltage is low, avoiding system power fluctuations, thereby solving the problem of beat frequency noise caused when the input power supply signal is too low, and having the dual effects of reducing the load current peak and voltage compensation.

Description

Technical Field

[0001] The present invention relates to the field of drive control technology, and in particular to a drive control circuit and a household appliance. Background Art

[0002] Generally speaking, the power factor of a passive PFC (Power Factor Correction) circuit is very low and requires the use of a large-capacity capacitor, resulting in a high cost of the passive PFC circuit.

[0003] The general circuit method without electrolytic capacitors has the following disadvantages:

[0004] First, the DC bus voltage fluctuates greatly, causing large fluctuations in the load current and high load current peaks. Therefore, it is necessary to set higher-specification overcurrent protection for the power module, which increases costs.

[0005] Second, there is a periodic phenomenon in which the bus voltage at the same power supply frequency is insufficient and unable to output power, resulting in problems such as beat frequency noise.

[0006] Therefore, there is an urgent need for a drive control circuit that can solve the above technical problems. Summary of the invention

[0007] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0008] To this end, a first aspect of the present invention provides a drive control circuit.

[0009] A second aspect of the present invention provides a household appliance.

[0010] In view of this, the first aspect of the present invention provides a drive control circuit, comprising: a voltage absorption compensation branch, connected in parallel with an inverter, the voltage absorption compensation branch comprising a capacitive element and a switching device connected in series, the switching device being configured to control the charging or discharging of the capacitive element, wherein the discharge of the capacitive element performs voltage compensation on the inverter, and the inverter is configured to drive a load to operate.

[0011] In this technical solution, the drive control circuit is provided with a voltage compensation branch, including a capacitive element and a switching device connected in series. Under the control of the switching device, the capacitive element is charged to reduce the current amplitude of the load, or the capacitive element is discharged to perform voltage compensation on the inverter.

[0012] By applying the technical solution provided by the present invention, the switch device and the capacitive element are set to select whether to absorb overvoltage or perform voltage compensation. If the power supply signal is too high, the capacitive element starts to absorb the overvoltage signal and realizes charging to reduce the load current peak.

[0013] If the power supply signal is too low, the capacitive element starts to discharge to achieve voltage compensation. The capacitive element does not need to be a large capacitor, which can reduce the cost of the voltage compensation circuit. At the same time, the capacitive element absorbs overvoltage and overcurrent signals. When the voltage is low, voltage compensation is achieved through the capacitive element to avoid system power fluctuations, thereby solving the beat frequency noise problem caused by the input power supply signal being too low.

[0014] Specifically, the capacitive component can use an electrolytic capacitor with a capacitance range of 10uF to 2000uF, without the need to use a capacitor with a larger capacitance, which can achieve better cost control and has the dual effects of reducing the load current peak and voltage compensation.

[0015] In addition, the driving control circuit in the above technical solution provided by the present invention may also have the following additional technical features:

[0016] In the above technical solution, further, the inverter is connected between the high-voltage bus and the low-voltage bus, one end of the switch device is connected to the high-voltage bus, and one end of the capacitive element is connected to the low-voltage bus.

[0017] In this technical solution, the inverter is connected between the high-voltage bus and the low-voltage bus to convert the DC signal on the bus into an AC signal to drive the load. One end of the switch element is connected to the high-voltage bus, and one end of the capacitive element is connected to the low-voltage bus to control the charging and discharging of the capacitive element.

[0018] In any of the above technical solutions, further, the drive control circuit also includes: a controller, which is connected to the switching device to adjust the conduction state of the switching device; wherein, if the power supply signal is greater than or equal to a first power supply signal threshold, the controller triggers the switching device to conduct in a first mode to control the capacitive element to charge; in addition, if the controller detects that the power supply signal is less than a second power supply signal threshold, the controller triggers the switching device to conduct in a second mode to control the capacitive element to discharge.

[0019] In this technical solution, the controller controls the conduction mode of the switch device according to the size of the power supply signal. Specifically, when the AC voltage signal exceeds the first voltage threshold, it means that the AC voltage is relatively high. At this time, the controller controls the switch device to conduct in the first mode to charge the capacitive element and reduce the load current amplitude; when the AC voltage signal is less than the second voltage threshold, it means that the AC voltage is too low. At this time, the controller controls the switch device to conduct in the second mode to discharge the capacitive element and perform power compensation on the inverter.

[0020] The first power supply signal threshold and the second power supply signal threshold may take the same value or different values, and the first power supply signal threshold and the second power supply signal threshold are mainly determined by the power of the load and the power of the inverter.

[0021] The power supply signal may be an AC voltage input to the rectifier module or a DC voltage output by the rectifier module.

[0022] In the above technical solution, further, the switching device includes: a power tube, which is connected in series with the capacitive element, and the control end of the power tube is connected to the command output end of the controller, and the command output end outputs a control instruction to the control end, and the control instruction is configured to control the power tube to be turned on or off; a reverse biased freewheeling diode, and the two ends of the reverse biased freewheeling diode are respectively connected to the drain and source of the power tube, wherein, if the power tube is turned on, the capacitive element discharges to the load through the power tube, and if the power tube is turned off, the capacitive element is charged through the reverse biased freewheeling diode or does not operate.

[0023] In this technical solution, the switch device includes a power tube and a reverse-biased freewheeling diode. The power tube is connected in series with a capacitive element. The command output end of the controller is connected to the control end of the power tube to send a control command to the power tube. The power tube changes the conduction state (on or off) according to the control command. The two ends of the reverse-biased freewheeling diode are respectively connected to the drain and source of the power tube. When the power tube is turned on, the capacitive element discharges to the load through the power tube to achieve voltage compensation. When the power tube is turned off, the input voltage signal charges the capacitive element through the reverse-biased freewheeling diode to reduce the load current peak. When the load current peak is at a normal level, there is no need to reduce the load current peak, and the capacitive element does not operate.

[0024] Among them, the capacitive element is charged through the reverse biased freewheeling diode, which means that the power supply signal charges the capacitive element through the reverse biased freewheeling diode, and at the same time, the power supply signal supplies power to the running load, and the charging process of the capacitive element is a complete charging process, that is, when the capacitive element is discharged, the discharge voltage of the capacitive element is greater than the power supply voltage on the line, thereby realizing voltage compensation.

[0025] Specifically, the power tube can preferably use an IGBT (Insulated Gate Bipolar Transistor) type power tube, or a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor). The reverse-biased freewheeling diode can be set independently or integrated with the IGBT or MOSFET.

[0026] In any of the above technical solutions, further, the drive control circuit also includes: a rectifier module, which is arranged between the input end of the capacitive element and the harmonic filtering module, and the rectifier module is configured to convert the power supply signal into a DC signal, wherein the DC signal is configured to charge the capacitive element and provide the power required for the load to operate, and the inverter is configured to control the DC signal to drive the load to operate.

[0027] In this technical solution, a rectifier module is provided in the drive control circuit, and the rectifier module is connected between the input end of the capacitive element and the filter module. The power supply signal input by the power grid system enters the rectifier module after the noise is filtered out by the filter module. The rectifier module rectifies the power supply signal and outputs the rectified DC signal to the capacitive element and the load part to charge the capacitive element and provide the load with the power required for operation.

[0028] In any of the above technical solutions, further, if the load includes a single-phase AC load, the inverter includes a corresponding single-phase inverter circuit, and the single-phase inverter circuit includes: two upper bridge arm power devices and two lower bridge arm power devices, which are connected between the output end of the voltage absorption compensation branch and the input end of the load; if the load includes a three-phase AC load, the inverter includes a corresponding three-phase inverter circuit, and the three-phase inverter circuit includes: three upper bridge arm power devices and three lower bridge arm power devices, which are connected between the output end of the voltage absorption compensation branch and the input end of the load, wherein the upper bridge arm power device of one phase is connected in series with the lower bridge arm power device of a corresponding phase, and the upper bridge arm power device and the lower bridge arm power device of the same phase are not turned on at the same time.

[0029] In this technical solution, if the load includes a single-phase AC load, a corresponding single-phase inverter circuit is provided in the inverter to output a corresponding drive signal to the single-phase AC load. Specifically, the single-phase AC load can be a single-phase motor or a single-phase inductive load.

[0030] The single-phase inverter circuit includes two upper bridge arm power devices and two lower bridge arm power devices, which are connected between the output section of the capacitive element and the input end of the load.

[0031] If the load includes a three-phase AC load, the inverter is provided with a corresponding three-phase inverter circuit to output a corresponding driving signal to the three-phase AC load. Specifically, the three-phase AC load may be an induction motor or a permanent magnet synchronous motor.

[0032] The three-phase inverter circuit includes three upper bridge arm power devices and three lower bridge arm power devices, which are connected between the output section of the capacitive element and the input end of the load. The upper bridge arm power device of each phase is connected in series with the lower bridge arm power device of the corresponding phase, and the upper bridge arm power device and the lower bridge arm power device of the same phase will not be turned on at the same time, and output a single-phase drive signal to the load of the three-phase AC load. The upper bridge arm power devices and the lower bridge arm power devices of the three phases are turned on alternately, and output three-phase drive signals to the load of the three-phase AC load.

[0033] In any of the above technical solutions, further, a reverse biased freewheeling diode is connected between the source and the drain of any of the upper bridge arm power devices, which is recorded as the upper bridge arm reverse biased freewheeling diode, and a reverse biased freewheeling diode is connected between the source and the drain of any of the lower bridge arm power devices, which is recorded as the lower bridge arm reverse biased freewheeling diode.

[0034] In this technical solution, a reverse biased freewheeling diode is indirectly connected between the source and drain of the upper bridge arm power device and the lower bridge arm power device, specifically, the upper bridge arm reverse biased freewheeling diode and the lower bridge arm reverse biased freewheeling diode.

[0035] In any of the above technical solutions, further, any of the upper bridge arm power devices includes a metal oxide semiconductor field effect transistor and / or an insulated gate bipolar transistor, and any of the lower bridge arm power devices includes a metal oxide semiconductor field effect transistor and / or an insulated gate bipolar transistor, wherein the collector of the insulated gate bipolar transistor is connected as the drain, and the emitter of the insulated gate bipolar transistor is connected as the source.

[0036] In this technical solution, the upper bridge arm power device includes a metal oxide semiconductor field effect transistor (i.e., MOSFET) and / or an insulated gate bipolar transistor (i.e., IGBT). When an insulated gate bipolar transistor is used, the collector of the insulated gate bipolar transistor is connected as the drain electrode, and the emitter is connected as the source electrode. The lower bridge arm power device includes a metal oxide semiconductor field effect transistor (i.e., MOSFET) and / or an insulated gate bipolar transistor (i.e., IGBT). When an insulated gate bipolar transistor is used, the collector of the insulated gate bipolar transistor is connected as the drain electrode, and the emitter is connected as the source electrode.

[0037] In any of the above technical solutions, further, the power tube includes a metal oxide semiconductor field effect transistor and / or an insulated gate bipolar transistor, wherein the gate of the metal oxide semiconductor field effect transistor is connected to the command output terminal of the controller as the control terminal, and the base of the insulated gate bipolar transistor is connected to the command output terminal of the controller as the control terminal.

[0038] In this technical solution, the power tube includes a metal oxide semiconductor field effect transistor (i.e., MOSFET) and / or an insulated gate bipolar transistor (i.e., IGBT), wherein the gate of the MOSFET serves as a control terminal, the command output terminal of the controller is connected to the gate of the MOSFET, the MOSFET of the IGBT serves as a control terminal, and the command output terminal of the controller is connected to the base of the IGBT.

[0039] In any of the above technical solutions, further, the load includes a fan and / or a compressor.

[0040] In any of the above technical solutions, further, the load includes an induction motor and / or a permanent magnet synchronous motor.

[0041] In any of the above technical solutions, further, the capacitive element includes an electrolytic capacitor, and / or the capacitive element includes one capacitive element, and / or the capacitive element includes a plurality of capacitive elements connected in series and / or in parallel.

[0042] In this technical solution, the capacitive element uses a single electrolytic capacitor, or a plurality of electrolytic capacitors connected in series and / or in parallel can be used to achieve free setting of the equivalent capacitance of the capacitive element.

[0043] In any of the above technical solutions, further, the capacitance value of the capacitive element ranges from 10uF to 2000uF.

[0044] Optionally, the capacitance of the capacitive element is 82uF.

[0045] Optionally, the capacitance of the capacitive element is 220uF.

[0046] Optionally, the capacitance of the capacitive element is 470uF.

[0047] Optionally, the capacitance of the capacitive element is 560uF.

[0048] Optionally, the capacitance of the capacitive element is 680uF.

[0049] Optionally, the capacitance of the capacitive element is 820uF.

[0050] In any of the above technical solutions, further, the power supply of the controller includes an isolated power supply or a bootstrap power supply, wherein the bootstrap power supply includes a bootstrap power supply circuit, a bootstrap diode and a bootstrap capacitor in the inverter, the anode of the bootstrap diode is connected to the positive electrode of the bootstrap power supply circuit, the cathode of the bootstrap diode is connected to the positive electrode of the bootstrap capacitor, and the positive electrode of the bootstrap capacitor is connected to the power supply end of the controller.

[0051] In this technical solution, the controller is provided with a power supply. Specifically, the power supply includes an isolated power supply or a bootstrap power supply. When the power supply is an isolated power supply, it is connected to the power supply end of the controller through the isolated power supply to provide electric energy for the controller. When the power supply is a bootstrap power supply, the bootstrap power supply includes a bootstrap power supply circuit, an isolated power supply or a bootstrap power supply connected in series. The negative pole of the bootstrap power supply circuit is connected to the low-voltage bus in the bus line, the positive pole of the bootstrap power supply circuit is connected to the positive pole of the bootstrap diode, and the negative pole of the bootstrap diode is connected to the positive pole of the bootstrap capacitor. The negative pole of the bootstrap capacitor is connected to the power supply end of the controller to provide electric energy for the controller.

[0052] In any of the above technical solutions, further, the voltage absorption compensation branch also includes: a resistor element and / or an inductor element connected in series with the capacitive element, the resistor element is used to adjust the current flowing through the capacitive element, and the inductor element is used to filter out AC noise flowing through the capacitive element.

[0053] In this technical solution, the resistance element and / or the inductance element can be connected between the high-voltage bus and the switch device, can be connected between the capacitive element and the low-voltage bus, or can be connected between the switch device and the capacitive element.

[0054] In addition, the resistance element includes one resistor, or multiple resistors connected in series and / or in parallel. Similarly, the inductance element includes one inductance, or multiple inductors connected in series and / or in parallel.

[0055] The second aspect of the present invention provides a household appliance, comprising: a load; a drive control circuit as described in any of the above technical solutions, wherein the drive control circuit is connected between the power grid system and the load, and the drive control circuit is configured to control the power grid system to supply power to the load.

[0056] In this technical solution, the household appliance includes the driving control circuit as described in any of the above technical solutions. Therefore, all the beneficial effects of the household appliance including the driving control circuit as described in any of the above technical solutions will not be repeated again.

[0057] In the above technical solution, further, the household electrical appliance includes at least one of an air conditioner, a refrigerator, a fan, a range hood, a vacuum cleaner and a computer host. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0059] Figure 1 A schematic diagram of a drive control circuit according to an embodiment of the present invention is shown;

[0060] Figure 2 A schematic diagram showing charging of a capacitive element in a drive control circuit according to an embodiment of the present invention is shown;

[0061] Figure 3 A schematic diagram showing the discharge of a capacitive element in a drive control circuit according to an embodiment of the present invention is shown;

[0062] Figure 4 A schematic diagram of a drive control circuit according to another embodiment of the present invention is shown;

[0063] Figure 5 A schematic diagram showing charging of a capacitive element in a drive control circuit according to another embodiment of the present invention is shown;

[0064] Figure 6 A schematic diagram showing the discharge of a capacitive element in a drive control circuit according to another embodiment of the present invention is shown;

[0065] Figure 7 A schematic diagram of a drive control circuit according to another embodiment of the present invention is shown;

[0066] Figure 8 A schematic diagram of a drive control circuit according to another embodiment of the present invention is shown;

[0067] Fig. 9 A schematic diagram of a drive control circuit according to another embodiment of the present invention is shown;

[0068] Fig.10 A schematic diagram of a drive control circuit according to another embodiment of the present invention is shown;

[0069] Fig.11 A schematic diagram of a drive control circuit according to another embodiment of the present invention is shown;

[0070] Fig.12 A schematic diagram of a drive control circuit according to another embodiment of the present invention is shown;

[0071] Fig.13 A schematic diagram of a drive control circuit according to another embodiment of the present invention is shown;

[0072] Fig.14 A schematic diagram of a drive control circuit according to another embodiment of the present invention is shown;

[0073] Fig.15 A schematic diagram of a drive control circuit according to another embodiment of the present invention is shown;

[0074] Fig.16 A schematic diagram of a drive control circuit according to another embodiment of the present invention is shown;

[0075] Fig.17 A block diagram of a household appliance according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0076] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0077] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0078] Refer to the following Figures 1 to 16 The driving control circuit and the household electrical appliance according to some embodiments of the present invention are described.

[0079] like Figure 1 , Figure 2 and Figure 3 As shown, in an embodiment of the first aspect of the present invention, a drive control circuit 100 is provided, comprising: a voltage absorption compensation branch connected in parallel with the inverter, wherein the voltage absorption compensation branch comprises a capacitive element C connected in series 1 and a switching device configured to control the capacitive element C 1 To charge or discharge, the capacitive element C 1 The discharge performs voltage compensation on the inverter, and the inverter is configured to drive a load to operate.

[0080] In this embodiment, the drive control circuit 100 is provided with a voltage compensation branch including capacitive elements C connected in series. 1 and switching devices. Under the control of the switching devices, the capacitive element C 1 Charging to reduce the current amplitude of the load, or the capacitive element C 1 Discharge to compensate the voltage of the inverter. Specifically, the capacitive element C 1 When charging, the current flows as follows Figure 2 As shown, the capacitive element C 1 When discharging, the current flows as follows Figure 3 shown.

[0081] The above embodiment provided by the present invention, by setting the switch device and the capacitive element C 1 Choose to absorb overvoltage or perform voltage compensation. If the power supply signal is too high, the capacitive element C 1 Start to absorb overvoltage signal and realize charging to reduce the load current peak.

[0082] If the supply signal is too low, the capacitive element C 1 Start to discharge to achieve voltage compensation, where the capacitive element C 1 It is not necessary to use a large capacitor, which can reduce the cost of the voltage compensation circuit. 1 It absorbs overvoltage and overcurrent signals and passes through the capacitive element C when the voltage is low. 1 Voltage compensation is also implemented to avoid system power fluctuations, thereby solving the problem of beat frequency noise caused when the input power supply signal is too low.

[0083] Specifically, the capacitive element C 1 Electrolytic capacitors with a capacitance range of 10uF to 2000uF can be used without the need to select capacitors with larger capacitance, which can achieve better cost control and has the dual functions of reducing the load current peak and voltage compensation.

[0084] In one embodiment of the present invention, further, the inverter is connected between the high voltage bus and the low voltage bus, one end of the switch device is connected to the high voltage bus, and the capacitive element C 1 One end is connected to the low voltage bus.

[0085] In this embodiment, the inverter is connected between the high-voltage bus and the low-voltage bus to convert the DC signal on the bus into an AC signal to drive the load. One end of the switch element is connected to the high-voltage bus, and the capacitive element C 1 One end of the capacitor is connected to the low voltage bus to achieve 1 Charging and discharging control.

[0086] In one embodiment of the present invention, further, Figure 1 , Figure 2 and Figure 3 As shown, the drive control circuit 100 further includes: a controller M, the controller M is connected to the switch device to adjust the conduction state of the switch device; wherein, if the power supply signal is greater than or equal to the first power supply signal threshold, the controller M triggers the switch device to conduct in the first mode to control the capacitive element C 1 In addition, if the controller M detects that the power supply signal is less than the second power supply signal threshold, the controller M triggers the switch device to conduct in the second mode to control the capacitive element C 1 Discharge.

[0087] In this embodiment, the controller M controls the conduction mode of the switch device according to the magnitude of the power supply signal. Specifically, when the AC voltage signal exceeds the first voltage threshold, it means that the AC voltage is high. At this time, the controller M controls the switch device to conduct in the first mode so that the capacitive element C 1 When the AC voltage signal is less than the second voltage threshold, it indicates that the AC voltage is too low. At this time, the controller M controls the switch device to conduct in the second mode so that the capacitive element C 1 Discharge to compensate the inverter power.

[0088] The power supply signal may be an AC voltage input to the rectifier module or a DC voltage output by the rectifier module.

[0089] In one embodiment of the present invention, further, Figure 1 , Figure 2 and Figure 3 As shown, the switch device includes: a power tube Q, and the capacitive element C 1 The control end of the power tube Q is connected in series, and the control end of the power tube Q is connected to the command output end of the controller M, and the command output end outputs a control command to the control end, and the control command is configured to control the power tube Q to be turned on or off; the reverse biased freewheeling diode D 1 , the reverse biased freewheeling diode D 1 The two ends of the capacitor C are connected to the drain and source of the power tube Q respectively. If the power tube Q is turned on, the capacitive element C 1 The power tube Q discharges to the load. If the power tube Q is turned off, the capacitive element C 1 The reverse biased freewheeling diode D 1 Charging or no action.

[0090] In this embodiment, the switch device includes a power tube Q and a reverse biased freewheeling diode D 1 , power tube Q and capacitive element C 1 The command output end of the controller M is connected in series to the control end of the power tube Q to send a control command to the power tube Q. The power tube Q changes its conduction state (on or off) according to the control command. The reverse biased freewheeling diode D 1 The two ends of the capacitor are connected to the drain and source of the power tube Q respectively. When the power tube Q is turned on, the capacitive element C 1 The power tube Q is discharged to the load to achieve voltage compensation. When the power tube Q is turned off, the input voltage signal is discharged to the load through the reverse biased freewheeling diode D 1 C is the capacitive element 1 When the load current peak is at a normal level, there is no need to reduce the load current peak. The capacitive element C 1 No action.

[0091] Wherein, the capacitive element C 1 The reverse biased freewheeling diode D 1 Charging means that the power supply signal passes through the reverse biased freewheeling diode D 1 For capacitive element C 1 At the same time, the power supply signal supplies power to the running load, and the capacitive element C 1 The charging process is a complete charging process, that is, the capacitive element C 1 When discharging, the capacitive element C 1 The discharge voltage is greater than the supply voltage on the line, thereby achieving voltage compensation.

[0092] Specifically, the power tube Q may preferably use an IGBT (Insulated Gate Bipolar Transistor) type power tube Q, or a MOSFET (Metal-O 1 ide-Semiconductor Field-Effect Transistor, Metal Oxide Semiconductor Power Field Effect Transistor), Reverse Biased Freewheeling Diode D 1 It can be set independently or integrated with IGBT or MOSFET.

[0093] In one embodiment of the present invention, further, Figure 1 , Figure 2 and Figure 3 As shown, the drive control circuit 100 further includes: a rectifier module, which is arranged on the capacitive element C 1 The rectifier module is configured to convert the power supply signal into a DC signal between the input end of the capacitor and the harmonic filtering module, wherein the DC signal is configured to pass the capacitive element C 1 The inverter is configured to control the DC signal to drive the load to operate.

[0094] In this embodiment, the driving control circuit 100 is provided with a rectifier module, which is connected to the capacitive element C 1 The power supply signal input by the power grid system enters the rectifier module after the noise is filtered out by the filter module. The rectifier module rectifies the power supply signal and outputs the DC signal obtained after rectification to the capacitive element C 1 and the load part, to the capacitive element C 1 Charges and provides the load with the power required for operation.

[0095] In one embodiment of the present invention, further, Figure 1 , Figure 2 , Figure 3, Figure 4 and Figure 5 As shown, if the load includes a single-phase AC load, the inverter includes a corresponding single-phase inverter circuit, and the single-phase inverter circuit includes: two upper bridge arm power devices and two lower bridge arm power devices, which are connected between the output end of the voltage absorption compensation branch and the input end of the load; if the load includes a three-phase AC load, the inverter includes a corresponding three-phase inverter circuit, and the three-phase inverter circuit includes: three upper bridge arm power devices and three lower bridge arm power devices, which are connected between the output end of the voltage absorption compensation branch and the input end of the load, wherein the upper bridge arm power device of one phase is connected in series with the lower bridge arm power device of a corresponding phase, and the upper bridge arm power device and the lower bridge arm power device of the same phase are not turned on at the same time.

[0096] In this embodiment, if the load includes a single-phase AC load, the inverter is provided with a corresponding single-phase inverter circuit to output a corresponding drive signal to the single-phase AC load. Specifically, the single-phase AC load can be a single-phase motor or a single-phase inductive load.

[0097] The single-phase inverter circuit includes two upper bridge arm power devices and two lower bridge arm power devices, which are connected to the capacitive element C 1 between the output stage and the input of the load.

[0098] Specifically, when the power supply signal exceeds the first power supply signal threshold, it means that the power supply signal is high. Figure 5 As shown, the controller M controls the switch device to conduct in the first mode, so that the capacitive element C 1 When the power supply signal is less than the second power supply signal threshold, it means that the power supply signal is too low. Figure 6 As shown, the controller M controls the switch device to conduct in the second mode so that the capacitive element C 1 Discharge to provide voltage compensation for single-phase AC load.

[0099] If the load includes a three-phase AC load, the inverter is provided with a corresponding three-phase inverter circuit to output a corresponding driving signal to the three-phase AC load. Specifically, the three-phase AC load may be an induction motor or a permanent magnet synchronous motor.

[0100] The three-phase inverter circuit includes three upper bridge arm power devices and three lower bridge arm power devices, which are connected to the capacitive element C 1The upper bridge arm power device of each phase is connected in series with the lower bridge arm power device of the corresponding phase. The upper bridge arm power device and the lower bridge arm power device of the same phase will not be turned on at the same time, and output a single-phase drive signal to the load of the three-phase AC load. The upper bridge arm power devices and the lower bridge arm power devices of the three phases are turned on alternately, and output three-phase drive signals to the load of the three-phase AC load.

[0101] In one embodiment of the present invention, further, Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, a reverse biased freewheeling diode is connected between the source and drain of any upper bridge arm power device, which is recorded as the upper bridge arm reverse biased freewheeling diode, and a reverse biased freewheeling diode is connected between the source and drain of any lower bridge arm power device, which is recorded as the lower bridge arm reverse biased freewheeling diode.

[0102] In this embodiment, a reverse biased freewheeling diode is indirectly provided between the source and the drain of the upper bridge arm power device and the lower bridge arm power device, specifically, the upper bridge arm reverse biased freewheeling diode and the lower bridge arm reverse biased freewheeling diode.

[0103] In one embodiment of the present invention, further, any of the upper bridge arm power devices includes a metal oxide semiconductor field effect transistor and / or an insulated gate bipolar transistor, and any of the lower bridge arm power devices includes a metal oxide semiconductor field effect transistor and / or an insulated gate bipolar transistor, wherein the collector of the insulated gate bipolar transistor is connected as the drain, and the emitter of the insulated gate bipolar transistor is connected as the source.

[0104] In this embodiment, the upper bridge arm power device includes a metal oxide semiconductor field effect transistor (i.e., MOSFET) and / or an insulated gate bipolar transistor (i.e., IGBT). When an insulated gate bipolar transistor is used, the collector of the insulated gate bipolar transistor is connected as the drain electrode, and the emitter is connected as the source electrode. The lower bridge arm power device includes a metal oxide semiconductor field effect transistor (i.e., MOSFET) and / or an insulated gate bipolar transistor (i.e., IGBT). When an insulated gate bipolar transistor is used, the collector of the insulated gate bipolar transistor is connected as the drain electrode, and the emitter is connected as the source electrode.

[0105] In one embodiment of the present invention, further, the power tube Q includes a metal oxide semiconductor field effect transistor and / or an insulated gate bipolar transistor, wherein the gate of the metal oxide semiconductor field effect transistor is connected to the command output terminal of the controller M as the control terminal, and the base of the insulated gate bipolar transistor is connected to the command output terminal of the controller M as the control terminal.

[0106] In this embodiment, the power tube Q includes a metal oxide semiconductor field effect transistor (i.e., MOSFET) and / or an insulated gate bipolar transistor (i.e., IGBT), wherein the gate of the MOSFET serves as a control terminal, the command output terminal of the controller M is connected to the gate of the MOSFET, the MOSFET of the IGBT serves as a control terminal, and the command output terminal of the controller M is connected to the base of the IGBT.

[0107] In one embodiment of the present invention, further, Figure 4 , Figure 5 and Figure 6 As shown, the driving control circuit 100 of the single-phase AC load includes a rectifier circuit, a power switch tube, a power diode, an electrolytic capacitor, a single-phase inverter circuit and a single-phase AC load.

[0108] The single-phase power supply signal source is converted into a DC voltage after passing through a rectifier circuit. The power switch tube is connected in parallel with the power diode. The emitter (or source) of the power switch tube and the cathode of the power diode are connected to the positive end of the DC voltage. The collector (or drain) of the power switch tube and the anode of the power diode are connected to the anode of the electrolytic capacitor. The cathode of the electrolytic capacitor is connected to the negative end of the DC voltage. The DC voltage powers the single-phase inverter circuit to drive the single-phase AC load.

[0109] Optionally, the single-phase inverter circuit may be composed of four IGBTs or four MOSFETs and have an anti-parallel freewheeling diode.

[0110] Optionally, the single-phase AC load may be a single-phase motor or a single-phase inductive load.

[0111] In one embodiment of the present invention, further, the load of the load includes a fan and / or a compressor.

[0112] In one embodiment of the present invention, further, the load includes an induction motor and / or a permanent magnet synchronous motor.

[0113] In one embodiment of the present invention, further, the capacitive element C 1 Including electrolytic capacitors, and / or the capacitive element C 1 includes a capacitive element, and / or the capacitive element C 1Includes multiple capacitive elements connected in series and / or in parallel.

[0114] In this embodiment, the capacitive element C 1 A single electrolytic capacitor can be used, or multiple electrolytic capacitors can be used in series and / or parallel to achieve the capacitive element C 1 Free setting of equivalent capacitance value.

[0115] In one embodiment of the present invention, further, the capacitive element C 1 The capacitance range is 10uF~2000uF.

[0116] Optionally, the capacitive element C 1 The capacitance is 82uF.

[0117] Optionally, the capacitive element C 1 The capacitance is 220uF.

[0118] Optionally, the capacitive element C 1 The capacitance is 470uF.

[0119] Optionally, the capacitive element C 1 The capacitance is 560uF.

[0120] Optionally, the capacitive element C 1 The capacitance is 680uF.

[0121] Optionally, the capacitive element C 1 The capacitance is 820uF.

[0122] In one embodiment of the present invention, further, Figure 7 , Figure 8 , Fig. 9 , Fig.10 and Fig.11 As shown, the power supply of the controller M includes an isolated power supply or a bootstrap power supply, wherein the bootstrap power supply includes a bootstrap power supply circuit DC, a bootstrap diode and a bootstrap capacitor in the inverter, the anode of the bootstrap diode is connected to the positive electrode of the bootstrap power supply circuit, the cathode of the bootstrap diode is connected to the positive electrode of the bootstrap capacitor, and the positive electrode of the bootstrap capacitor is connected to the power supply end of the controller M.

[0123] In this embodiment, the controller M is provided with a power supply. Specifically, the power supply includes an isolated power supply or a bootstrap power supply. When the power supply is an isolated power supply, the isolated power supply is connected to the power supply end of the controller M to provide power to the controller M. When the power supply is a bootstrap power supply, the bootstrap power supply includes a bootstrap power supply circuit DC and a bootstrap diode D connected in series. 2 and the bootstrap capacitor C 2The negative pole of the bootstrap power supply circuit DC is connected to the low voltage bus in the bus line, and the positive pole of the bootstrap power supply circuit is connected to the bootstrap diode D 2 The positive electrode of the bootstrap diode D 2 The negative electrode and the bootstrap capacitor C 2 The positive electrode of the bootstrap capacitor C 2 The negative pole of is connected to the power supply end of the controller M to provide electrical energy to the controller M.

[0124] Alternatively, if Figure 7 , Figure 8 , Fig. 9 and Fig.10 As shown, the load is a three-phase load, and the switching power supply unit includes a controller M and a power supply, wherein the power supply is a bootstrap power supply.

[0125] Wherein, optionally, Figure 8 As shown, the bootstrap diode D 2 Set to one.

[0126] Wherein, optionally, Fig. 9 As shown, the bootstrap diode D 2 Set to two.

[0127] Wherein, optionally, Fig.10 As shown, the bootstrap diode D 2 Set to three.

[0128] Multiple bootstrap diodes D 2 The reliability of the drive control circuit can be improved.

[0129] Alternatively, if Figure 7 and Fig.11 As shown, the load is a three-phase load, and the switching power supply unit includes a controller M and a power supply, wherein the power supply is an isolated power supply.

[0130] Alternatively, if Fig.12 , Fig.13 and Fig.14 As shown, the load is a single-phase load, and the switching power supply unit includes a controller M and a power supply, wherein the power supply is a bootstrap power supply.

[0131] Wherein, optionally, Fig.13 As shown, the bootstrap diode D 2 Set to one.

[0132] Wherein, optionally, Fig.14 As shown, the bootstrap diode D 2 Set to two.

[0133] Two bootstrap diodes D 2 The reliability of the drive control circuit can be improved.

[0134] Alternatively, if Fig.12 and Fig.15 As shown, the load is a single-phase load, and the switching power supply unit includes a controller M and a power supply, wherein the power supply is a bootstrap power supply.

[0135] like Fig.16 As shown, in this technical solution, the resistance element and / or the inductance element L 0 It can be connected between the high voltage bus and the switch device, or it can be connected to the capacitive element C 1 Between the low voltage busbar and the switch device and capacitive element C 1 between.

[0136] In any of the above technical solutions, further, the resistance element includes a resistor, or a plurality of resistors connected in series and / or in parallel. Similarly, the inductance element L 0 Includes one inductor, or multiple inductors connected in series and / or in parallel.

[0137] like Fig.17 As shown, in an embodiment of the second aspect of the present invention, a household appliance 300 is provided, including: a load 200; a drive control circuit 100 as described in any of the above embodiments, the drive control circuit 100 is connected between the power grid system and the load, and the drive control circuit 100 is configured to control the power grid system to supply power to the load 200.

[0138] In this embodiment, the household appliance includes the driving control circuit 100 as described in any of the above embodiments. Therefore, all the beneficial effects of the household appliance including the driving control circuit 100 as described in any of the above embodiments are not repeated again.

[0139] In one embodiment of the present invention, further, the household electrical appliance includes at least one of an air conditioner, a refrigerator, a fan, a range hood, a vacuum cleaner and a computer host.

[0140] In the description of the present invention, the term "plurality" refers to two or more than two. Unless otherwise clearly defined, the orientation or positional relationship indicated by the terms "upper" and "lower" is based on the orientation or positional relationship described in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention. The terms "connection", "installation", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0141] In the description of the present invention, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In the present invention, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0142] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A drive control circuit, characterized in that: include: A voltage absorption compensation branch is connected in parallel with the inverter, wherein the voltage absorption compensation branch comprises a capacitive element and a switch device connected in series, wherein the switch device is configured to control the capacitive element to charge or discharge, Wherein, the capacitive element discharges to perform voltage compensation on the inverter, and the inverter is configured to drive a load to operate; A controller, the controller being connected to the switch device to adjust the conduction state of the switch device; Wherein, if the power supply signal is greater than or equal to the first power supply signal threshold, the controller triggers the switch device to conduct in the first mode to control the capacitive element to charge, In addition, if the controller detects that the power supply signal is less than a second power supply signal threshold, the controller triggers the switch device to conduct in a second mode to control the capacitive element to discharge; The first power supply signal threshold and the second power supply signal threshold are determined by the power of the load and the power of the inverter; the switching device includes: A power tube, connected in series with the capacitive element, wherein a control end of the power tube is connected to an instruction output end of the controller, and the instruction output end outputs a control instruction to the control end, wherein the control instruction is configured to control the power tube to be turned on or off; A reverse biased freewheeling diode, wherein two ends of the reverse biased freewheeling diode are respectively connected to the drain and source of the power tube, Wherein, if the power tube is turned on, the capacitive element discharges to the load through the power tube, and if the power tube is turned off, the capacitive element is charged through the reverse biased freewheeling diode or does not act; The reverse biased freewheeling diode is integrated with the power tube; The drive control circuit also includes: A rectifier module is provided between the input end of the capacitive element and the power grid system, and the rectifier module is configured to convert the power supply signal into a DC signal. The power supply signal is an AC voltage input to the rectifier module, or a DC voltage output by the rectifier module; The capacitive element comprises an electrolytic capacitor, and / or the capacitive element comprises one capacitive element, and / or the capacitive element comprises a plurality of capacitive elements connected in series and / or in parallel.

2. The drive control circuit according to claim 1, characterized in that: The inverter is connected between a high-voltage bus and a low-voltage bus, one end of the switch device is connected to the high-voltage bus, and one end of the capacitive element is connected to the low-voltage bus.

3. The drive control circuit according to claim 1, characterized in that: The DC signal is configured to charge the capacitive element and provide the power required for the load to operate, and the inverter is configured to control the DC signal to drive the load to operate.

4. The drive control circuit according to claim 1, characterized in that: If the load includes a single-phase AC load, the inverter includes a corresponding single-phase inverter circuit, and the single-phase inverter circuit includes: Two upper bridge arm power devices and two lower bridge arm power devices are connected between the output end of the voltage absorption compensation branch and the input end of the load, If the load includes a three-phase AC load, the inverter includes a corresponding three-phase inverter circuit, and the three-phase inverter circuit includes: Three upper bridge arm power devices and three lower bridge arm power devices are connected between the output end of the voltage absorption compensation branch and the input end of the load, The upper bridge arm power device of one phase is connected in series with the lower bridge arm power device of a corresponding phase, and the upper bridge arm power device and the lower bridge arm power device of the same phase are not turned on at the same time.

5. The drive control circuit according to claim 4, characterized in that: A reverse biased freewheeling diode is connected between the source and drain of any of the upper bridge arm power devices, which is referred to as the upper bridge arm reverse biased freewheeling diode. A reverse biased freewheeling diode is connected between the source and the drain of any of the lower bridge arm power devices, which is recorded as the lower bridge arm reverse biased freewheeling diode.

6. The drive control circuit according to claim 4, characterized in that: Any of the upper bridge arm power devices comprises a metal oxide semiconductor field effect transistor and / or an insulated gate bipolar transistor, Any of the lower bridge arm power devices comprises a metal oxide semiconductor field effect transistor and / or an insulated gate bipolar transistor, Wherein, the collector of the insulated gate bipolar transistor is connected as the drain, and the emitter of the insulated gate bipolar transistor is connected as the source.

7. The drive control circuit according to claim 4, characterized in that: The power transistor includes a metal oxide semiconductor field effect transistor and / or an insulated gate bipolar transistor. The gate of the metal oxide semiconductor field effect transistor is connected to the command output terminal of the controller as the control terminal, and the base of the insulated gate bipolar transistor is connected to the command output terminal of the controller as the control terminal.

8. The drive control circuit according to any one of claims 1 to 7, characterized in that: The loads include fans and / or compressors. Or the load of the load includes an induction motor and / or a permanent magnet synchronous motor.

9. The drive control circuit according to any one of claims 1 to 7, characterized in that: The capacitance value of the capacitive element ranges from 10uF to 2000uF.

10. The drive control circuit according to any one of claims 1 to 7, characterized in that: The power supply of the controller includes an isolated power supply or a bootstrap power supply. The bootstrap power supply includes a bootstrap power supply circuit, a bootstrap diode and a bootstrap capacitor in the inverter, the anode of the bootstrap diode is connected to the positive electrode of the bootstrap power supply circuit, the cathode of the bootstrap diode is connected to the positive electrode of the bootstrap capacitor, and the positive electrode of the bootstrap capacitor is connected to the power supply end of the controller.

11. The drive control circuit according to any one of claims 1 to 7, characterized in that: The voltage absorption compensation branch also includes: A resistance element and / or an inductance element connected in series with the capacitive element, the resistance element is used to adjust the current flowing through the capacitive element, and the inductance element is used to filter out AC noise flowing through the capacitive element.

12. The drive control circuit according to claim 11, characterized in that: The resistance element has a value range of 0.1 mΩ to 10 Ω, and the inductance element has a value range of 1 uH to 10 mH.

13. A household appliance, characterized in that: include: load; The drive control circuit according to any one of claims 1 to 12, wherein the drive control circuit is connected between the power grid system and the load, and the drive control circuit is configured to control the power grid system to supply power to the load.

14. The household appliance according to claim 13, characterized in that: The household electrical appliances include at least one of an air conditioner, a refrigerator, a fan, a range hood, a vacuum cleaner and a computer host.

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