Drive control circuits and home appliances

Abstract

The present invention provides a driving control circuit and household electrical appliances, wherein the driving control circuit comprises: a half-bridge circuit, the half-bridge circuit is connected to the bus circuit, the half-bridge circuit is configured to convert and process the power supply signal, and the half-bridge circuit specifically comprises: a switch tube, the switch tube is configured to have a control end; a Hall sensor, the Hall sensor is configured to sample the power supply signal to obtain a corresponding sampling signal; a comparison module, the first input end of the comparison module is configured to access a reference signal, and the second input end of the comparison module is configured to access a sampling signal corresponding to the electrical signal, wherein the output end of the comparison module is connected to the control end of the switch tube, and if the absolute value of the sampling signal is greater than the reference signal, the comparison module outputs a cutoff signal to the switch tube. Through the technical solution of the present invention, overcurrent protection of the functional circuit is achieved, the impact of overcurrent on the switch tube is avoided, and the reliability of the driving control circuit and household electrical appliances is improved.

Description

Technical Field

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

[0002] In the current variable frequency air conditioner market, in order to improve the load operation energy efficiency, a rectifier, an inductor, a PFC (Power Factor Correction) module, an electrolytic capacitor and an inverter are usually used to form a drive control circuit for the motor (load).

[0003] In the related art, in order to reduce the power consumption of the BOOST-type PFC and the power consumption of the rectifier, a totem-pole PFC module is used to replace the BOOST-type PFC and the rectifier. However, in order to further improve the energy efficiency of the circuit, at least one half-bridge circuit in the totem-pole PFC module is usually set to maintain high-frequency operation.

[0004] Specifically, Figure 1 As shown, an inductor L, a totem pole PFC (Power Factor Correction) module, an electrolytic capacitor E and an inverter are used to form a drive control circuit for a motor (load). The above drive control circuit has at least the following technical defects during operation:

[0005] (1) Since a large number of switch tubes (a first switch tube Q1, a second switch tube Q2, a third switch tube Q3 and a fourth switch tube Q4) are usually arranged in a totem pole PFC module, and the switch tubes operate at a high frequency, this may cause a large number of high-order harmonics to be generated in the drive control circuit.

[0006] (2) Based on the Miller effect, the inherent parasitic capacitance of the switch tube will generate a large amount of peak voltage, peak current and power consumption, which will seriously affect the reliability of the totem pole PFC module, drive control circuit and household appliances.

[0007] In addition, any discussion of background technology throughout the specification does not mean that the background technology is necessarily the prior art known to technicians in the relevant field, and any discussion of prior art throughout the specification does not mean that the prior art is necessarily widely known or necessarily constitutes common knowledge in the field. Summary of the invention

[0008] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0009] To this end, an object of the present invention is to provide a drive control circuit.

[0010] Another object of the present invention is to provide a household electrical appliance.

[0011] In the technical solution of the first aspect of the present invention, a drive control circuit is proposed, including: a half-bridge circuit, the half-bridge circuit is connected to the bus circuit, the half-bridge circuit is configured to convert and process the power supply signal, and the half-bridge circuit specifically includes: a switch tube, the switch tube is configured to have a control end; the Hall sensor is configured to sample the power supply signal to obtain a corresponding sampling signal; a comparison module, the first input end of the comparison module is configured to access a reference signal, and the second input end of the comparison module is configured to access a sampling signal corresponding to the electrical signal, wherein the output end of the comparison module is connected to the control end of the switch tube, and if the absolute value of the sampling signal is greater than the reference signal, the comparison module outputs a cutoff signal to the switch tube.

[0012] In this technical solution, for a half-bridge circuit with at least two switching tubes, since there is a parasitic capacitance between the control end and the output end of the switching tube, the parasitic capacitance will cause voltage interference between the two switching tubes under the amplification effect of the switching tube. For example, at the moment when the second switching tube (recorded as the lower switching tube) starts to turn on, the parasitic capacitance of the lower switching tube generates a spike voltage. This spike voltage impacts the first switching tube in the form of a spike current, which may cause the first switching tube (recorded as the upper switching tube) to be broken down, and then cause the half-bridge circuit to fail. Therefore, by setting a Hall sensor and a comparison module in the half-bridge circuit to perform overcurrent protection and overvoltage protection on the switching tube, not only can the impact of parasitic capacitance and power supply signal on the half-bridge circuit be reduced, but also the power consumption of the half-bridge circuit can be reduced. In addition, since there is no need to set an isolation circuit for the half-bridge circuit, the cost of the drive control circuit is also reduced, thereby improving the reliability and stability of the drive control circuit.

[0013] Among them, the output end of the comparison module is connected to the control end of the switching tube. If the absolute value of the sampling signal is greater than the reference signal, the comparison module outputs a cutoff signal to the switching tube. Especially in overcurrent protection or overvoltage protection, there is no need to go through a driver to trigger the switch tube to be cut off, which can further avoid the possibility of the switching tube being broken down.

[0014] In addition, a Hall sensor is provided to sample the electrical signal flowing through the half-bridge circuit, and the sampling result is transmitted to the driver, and the switching frequency is adjusted according to the detection result. For example, when it is detected that the current in the power supply signal carries more spike signals, in order to avoid the spike signals being amplified and superimposed through the half-bridge circuit, the electromagnetic interference signal and the spike signal can be reduced by lowering the switching frequency.

[0015] In addition, the driving control circuit according to the above embodiment of the present invention may also have the following additional technical features:

[0016] In any of the above technical solutions, optionally, the on-state voltage of the switch tube is greater than zero, and the comparison module also includes: a first comparator, the positive input terminal of the first comparator is connected to a first reference signal, the negative input terminal of the first comparator is connected to the sampling signal, and the output terminal of the first comparator is connected to the control terminal of the switch tube; and / or, a second comparator, the negative input terminal of the second comparator is connected to a second reference signal, the positive input terminal of the second comparator is connected to the sampling signal, and the output terminal of the second comparator is connected to the control terminal of the switch tube, wherein the reference signal is the first reference signal or the second reference signal.

[0017] In this technical solution, the on-state voltage of the switch tube is greater than zero, that is, the switch tube is an N-type metal oxide semiconductor field effect transistor or an NPN-type triode, and is turned on when the driving signal at its control end (gate or base) is at a high level.

[0018] Furthermore, the first comparator is used to compare the size relationship between the sampling signal of the positive half axis and the first reference signal. According to the above connection method, it can be seen that if the positive sampling signal is greater than the first reference signal, the first comparator outputs a low-level signal. Similarly, the second comparator is used to compare the size relationship between the sampling signal of the negative half axis and the second reference signal. According to the above connection method, it can be seen that if the negative sampling signal is less than the second reference signal, the second comparator outputs a low-level signal. The low-level signal is transmitted to the control end of the switch tube (N-type metal oxide semiconductor field effect transistor or NPN-type transistor), that is, it is used as a cut-off signal to directly control the switch tube to be cut off.

[0019] In summary, as long as the amplitude of the sampling signal is greater than the reference signal, the comparison module will output a cutoff signal to the control end of the switch tube to directly turn off the switch tube, thereby improving the reliability of overcurrent protection (or overvoltage protection) and shortening the response time of overcurrent protection (or overvoltage protection).

[0020] In any of the above technical solutions, optionally, it also includes: a unidirectional conductive element, which is connected in series between the output end of the comparison module and the control end of the switch tube, and the unidirectional conductive element is configured to unidirectionally transmit the cutoff signal to the control end of the switch tube.

[0021] In this technical solution, a unidirectional conductive element is connected between the output end of the comparison module and the control end of the switch tube. The unidirectional conductive element is turned on only when the comparison module outputs a cutoff signal, that is, the switch tube is directly turned off. When the cutoff signal is not output, the control end of the switch tube receives the control signal of the driver and is turned on or off according to the control signal.

[0022] In any of the above technical solutions, optionally, each bridge arm of the half-bridge circuit includes at least one switching tube, and if the input end of the half-bridge circuit is connected to a power supply signal, the output end of the half-bridge circuit outputs a DC signal; if the input end of the half-bridge circuit is connected to a DC signal, the output end of the half-bridge circuit outputs a power supply signal.

[0023] In this technical solution, each bridge arm of the half-bridge circuit is provided to include at least one switching tube, and the conversion processing of the power supply signal is realized by turning on and off the switching tube, usually converting the input power supply signal into a DC signal, or converting the input DC signal into a power supply signal to drive the load to operate reliably.

[0024] In any of the above technical solutions, optionally, it also includes: a power factor correction module, the power factor correction module includes two half-bridge circuits connected in parallel, respectively recorded as a first half-bridge circuit and a second half-bridge circuit; a driver, the driver is connected to the output end of the Hall sensor, if the driver detects that the power supply signal is greater than the bus voltage, and the sampling signal is greater than or equal to a preset voltage threshold, and the input current of the second half-bridge circuit is greater than or equal to a preset current threshold, then the driver outputs a pulse drive signal to the first half-bridge circuit, wherein the pulse drive signal is configured to control the two switching tubes in the first half-bridge circuit to be alternately turned on.

[0025] In this technical solution, the current size in the power supply signal is collected by the Hall sensor, and when it is determined by comparison that the driving power supply signal is greater than the bus voltage, and the sampling signal is greater than or equal to the voltage threshold, and the input current of the second half-bridge circuit is greater than or equal to the preset current threshold, the first half-bridge circuit is controlled to start working, that is, the first half-bridge circuit is controlled to work with a pulse drive signal. Usually, the first half-bridge circuit works in a high-frequency mode, and the switching frequency is greater than 1KHz to reduce the impact of abnormal circuit conditions on the switching tube.

[0026] Among them, the power factor correction module includes two parallel half-bridge circuits, and switching tubes are provided in the four bridge arms, that is, a totem pole PFC (Power Factor Correction) module is constituted. Optionally, the upper switching tube in the half-bridge circuit is an NPN transistor, the lower switching tube is a PNP transistor, and the upper switching tube and the lower switching tube are connected with a common emitter, and the emitter is also an output end of the above-mentioned totem pole PFC module.

[0027] Optionally, the voltage threshold value ranges from 0 to 200V, and the current threshold value ranges from 0 to 10A.

[0028] Optionally, the switch tube in the totem pole PFC module can also be set to a MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor), and the switch tube can also be an S i C-type switch tube or G a N-type switching tube, therefore, the switching frequency of the switching tube can be further increased. Although it can further improve the load operation energy efficiency, the electromagnetic interference signal is stronger, which requires the addition of a filtering module to reduce the electromagnetic interference signal.

[0029] Optionally, a reverse freewheeling diode is integrated between the source (emitter) and the drain (collector) of the switch tube of the totem pole type PFC.

[0030] In any of the above technical solutions, optionally, the first half-bridge circuit includes a first switch tube and a second switch tube, the second half-bridge circuit includes a third switch tube and a fourth switch tube, the common end between the first switch tube and the second switch tube is connected to the first line of the power supply signal, the common end between the third switch tube and the fourth switch tube is connected to the second line of the power supply signal, and the common end between the first switch tube and the fourth switch tube is connected to the high-voltage bus in the bus circuit, and the common end between the second switch tube and the third switch tube is connected to the low-voltage bus, wherein when the power supply signal is a positive half-wave signal, the driver controls the third switch tube to turn on, and at the same time, the driver controls the fourth switch tube to turn off, and when the power supply signal is a negative half-wave signal, the driver controls the third switch tube to turn off, and at the same time, the driver controls the fourth switch tube to turn on.

[0031] In any of the above technical solutions, optionally, the switching tube is a metal oxide semiconductor field effect transistor 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, a reverse freewheeling diode is connected between the source and the drain of the metal oxide semiconductor field effect transistor, the base of the insulated gate bipolar transistor is connected to the command output terminal of the controller, and a reverse freewheeling diode is connected between the emitter and the collector of the insulated gate bipolar transistor.

[0032] The metal oxide semiconductor field effect transistor can be a depletion mode field effect transistor or an enhancement mode field effect transistor, or an S i C transistor or G a N transistor.

[0033] In any of the above technical solutions, optionally, it also includes: an electrolytic capacitor, arranged at the output end of the power factor correction module, the electrolytic capacitor is configured to receive the pulsating DC signal and convert it into a DC signal; an inverter, connected to the output end of the electrolytic capacitor, the inverter is configured to control the DC signal to power the load.

[0034] In this technical solution, an electrolytic capacitor is arranged at the output end of the half-bridge circuit. On the one hand, the electrolytic capacitor can provide power for load operation. On the other hand, the electrolytic capacitor can also absorb surge signals contained in the drive control circuit, which can further reduce the electromagnetic interference signal and noise flowing to the inverter, and is beneficial to improving the reliability of load operation.

[0035] If the inverter includes two half-bridge circuits connected in parallel, a single-phase load can be driven to operate; if the inverter includes three half-bridge circuits connected in parallel, a three-phase load can be driven to operate.

[0036] In any of the above technical solutions, optionally, the capacitance of the electrolytic capacitor ranges from 10uF to 20000uF.

[0037] In the technical solution of the second aspect of the present invention, a household appliance is proposed, comprising: a load; and a driving control circuit as described in any one of the technical solutions in the first aspect of the present invention, wherein the driving control circuit is configured to control a power supply signal to supply power to the load.

[0038] In this technical solution, the household appliance includes the driving control circuit as described in the above technical solution. Therefore, all the beneficial effects of the household appliance including the driving control circuit as described in the above technical solution will not be repeated again.

[0039] In the above technical solution, optionally, 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.

[0040] Additional aspects and advantages of the present invention will become apparent from the following description or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] 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:

[0042] Figure 1 A schematic diagram of a drive control circuit according to an embodiment of the prior art is shown;

[0043] Figure 2 shows a timing diagram of a drive control circuit according to an embodiment of the present invention;

[0044] Figure 3 A schematic diagram of a drive control circuit according to an embodiment of the present invention is shown;

[0045] Figure 4 A schematic diagram of a drive control circuit according to another embodiment of the present invention is shown;

[0046] Figure 5 A schematic diagram of a drive control circuit according to another embodiment of the present invention is shown;

[0047] Figure 6 FIG. 4 is a schematic diagram showing a driving control circuit according to another embodiment of the present invention. DETAILED DESCRIPTION

[0048] 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.

[0049] 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.

[0050] Combine the following Figures 1 to 5 A driving control circuit and a household electrical appliance according to an embodiment of the present invention are described in detail.

[0051] like Figure 1 As shown, after the power supply signal AC is input to the drive control circuit, an inductor L, a totem pole PFC (Power Factor Correction) module, an electrolytic capacitor E and an inverter are usually used to form a drive control circuit for the motor (load). Since a large number of switching tubes (a first switching tube Q1, a second switching tube Q2, a third switching tube Q3 and a fourth switching tube Q4) are usually arranged in the totem pole PFC module, in addition, a Hall sensor S is arranged in the charging circuit of the inductor L, and the current is detected based on the Hall sensor S.

[0052] like Figure 1 As shown, a first reverse freewheeling diode D1 is provided between the source and drain of the first switch tube Q1, a second reverse freewheeling diode D2 is provided between the source and drain of the second switch tube Q2, a third reverse freewheeling diode D3 is provided between the source and drain of the third switch tube Q3, and a fourth reverse freewheeling diode D4 is provided between the source and drain of the fourth switch tube Q4.

[0053] like Figure 2As shown, the totem pole PFC (Power Factor Correction) module usually works in the following mode:

[0054] (1) During the period T0 to T3, the AC voltage is recorded as U S The controller outputs a pulse drive signal to the first switch tube Q1 and the second switch tube Q2. The duty cycle of the first switch tube Q1 is a variable value (increasing from small or decreasing from large) or a preset constant value. The on-time of the first switch tube Q1 is complementary to the on-time of the second switch tube Q2. The third switch tube Q3 is turned on, and the fourth switch tube Q4 is turned off.

[0055] (2) During the period from T3 to T6, the AC voltage is recorded as U S The controller outputs a pulse drive signal to the first switch tube Q1 and the second switch tube Q2. The duty cycle of the first switch tube Q1 is a variable value (increasing from small or decreasing from large) or a preset constant value. The on-time of the first switch tube Q1 is complementary to the on-time of the second switch tube Q2. The third switch tube Q3 is turned off, and the fourth switch tube Q4 is turned on.

[0056] like Figure 3 As shown, in a totem pole PFC (Power Factor Correction) module, if the switch tube is an N-type MOSFET, the parasitic capacitance C dg The peak current I dg The direction is from the gate to the drain. The peak current of the second switch tube Q2 will cause a peak voltage to be generated at the gate of the first switch tube Q1. This peak voltage may break down the first switch tube Q1.

[0057] Among them, the controller is connected to the driver, and drives the switch tube to be turned on or off through the driver. For example, a first resistor R1 (mainly used for current limiting and voltage division) is connected between the gate of the first switch tube Q1 and the driver, a second resistor R2 (mainly used for driving conduction) is connected between the gate and the source of the first switch tube Q1, a third resistor R3 (mainly used for current limiting and voltage division) is connected between the gate of the second switch tube Q2 and the driver, and a fourth resistor R4 (mainly used for driving conduction) is connected between the gate and the source of the second switch tube Q2.

[0058] like Figure 4 , Figure 5 and Figure 6As shown, a drive control circuit according to an embodiment of the present invention includes: a half-bridge circuit 100, wherein the half-bridge circuit 100 is connected to a bus circuit, wherein the half-bridge circuit 100 is configured to convert and process a power supply signal AC, and wherein the half-bridge circuit 100 specifically includes: a switch tube, wherein the switch tube is configured to have a control end; a Hall sensor S, wherein the Hall sensor S is configured to sample the power supply signal AC to obtain a corresponding sampling signal; a comparison module, wherein a first input end of the comparison module is configured to access a reference signal, and a second input end of the comparison module is configured to access a sampling signal corresponding to the electrical signal, wherein an output end of the comparison module is connected to a control end of the switch tube, and if the absolute value of the sampling signal is greater than the reference signal, the comparison module outputs a cutoff signal to the switch tube.

[0059] In this technical solution, for a half-bridge circuit 100 having at least two switch tubes, since there is a parasitic capacitance C between the control end and the output end of the switch tube, dg , parasitic capacitance C dg The amplification of the switch tube will cause voltage interference between the two switch tubes. For example, when the second switch tube Q2 (referred to as the lower switch tube) starts to conduct, the parasitic capacitance C of the lower switch tube dg A spike voltage is generated. This spike voltage impacts the first switch tube Q1 in the form of a spike current, which may cause the first switch tube Q1 (referred to as the upper switch tube) to be broken down, thereby causing the half-bridge circuit 100 to fail. Therefore, by setting a Hall sensor S and a comparison module in the half-bridge circuit 100 to perform overcurrent protection and overvoltage protection on the switch tube, not only can the parasitic capacitance C be reduced, but also the parasitic capacitance C can be reduced. dg The impact of the power supply signal AC on the half-bridge circuit 100 can be reduced, and the power consumption of the half-bridge circuit 100 can be reduced. In addition, since there is no need to set an isolation circuit for the half-bridge circuit 100, the cost of the drive control circuit is also reduced, thereby improving the reliability and stability of the drive control circuit.

[0060] Among them, the output end of the comparison module is connected to the control end of the switching tube. If the absolute value of the sampling signal is greater than the reference signal, the comparison module outputs a cutoff signal to the switching tube. Especially in overcurrent protection or overvoltage protection, there is no need to go through a driver to trigger the switch tube to be cut off, which can further avoid the possibility of the switching tube being broken down.

[0061] In addition, a Hall sensor S is provided to sample the electrical signal flowing through the half-bridge circuit 100, and the sampling result is transmitted to the driver, and the switching frequency is adjusted according to the detection result. For example, when it is detected that the current in the power supply signal AC carries more spike signals, in order to avoid the spike signals being amplified and superimposed through the half-bridge circuit 100, the electromagnetic interference signal and the spike signal can be reduced by reducing the switching frequency.

[0062] Optionally, the sampling frequency range of the Hall sensor S is 1 KHz to 1000 MHz, and the sampling signal is also used for closing control of the current loop.

[0063] In addition, the driving control circuit according to the above embodiment of the present invention may also have the following additional technical features:

[0064] In any of the above technical solutions, optionally, the on-state voltage of the switch tube is greater than zero, and the comparison module also includes: a first comparator C1, the positive input terminal of the first comparator C1 is connected to the first reference signal B1, the negative input terminal of the first comparator C1 is connected to the sampling signal, and the output terminal of the first comparator C1 is connected to the control terminal of the switch tube; and / or, a second comparator C2, the negative input terminal of the second comparator C2 is connected to the second reference signal B2, the positive input terminal of the second comparator C2 is connected to the sampling signal, and the output terminal of the second comparator C2 is connected to the control terminal of the switch tube, wherein the reference signal is the first reference signal B1 or the second reference signal B2.

[0065] In this technical solution, the on-state voltage of the switch tube is greater than zero, that is, the switch tube is an N-type metal oxide semiconductor field effect transistor or an NPN-type triode, and is turned on when the driving signal at its control end (gate or base) is at a high level.

[0066] like Figure 6 As shown, the first comparator C1 is used to compare the size relationship between the sampling signal of the positive half axis and the first reference signal B1. According to the above connection method, it can be seen that if the positive sampling signal is greater than the first reference signal B1, the first comparator C1 outputs a low-level signal. Similarly, the second comparator C2 is used to compare the size relationship between the sampling signal of the negative half axis and the second reference signal B2. According to the above connection method, it can be seen that if the negative sampling signal is less than the second reference signal B2, the second comparator C2 outputs a low-level signal. The low-level signal is transmitted to the control end of the switch tube (N-type metal oxide semiconductor field effect transistor or NPN-type triode), that is, it is used as a cut-off signal to directly control the switch tube to be cut off.

[0067] In summary, as long as the amplitude of the sampling signal is greater than the reference signal, the comparison module will output a cutoff signal to the control end of the switch tube to directly turn off the switch tube, thereby improving the reliability of overcurrent protection (or overvoltage protection) and shortening the response time of overcurrent protection (or overvoltage protection).

[0068] In any of the above technical solutions, optionally, it also includes: a unidirectional conductive device D0, which is connected in series between the output end of the comparison module and the control end of the switch tube, and the unidirectional conductive device D0 is configured to unidirectionally transmit the cutoff signal to the control end of the switch tube.

[0069] like Figure 4 and Figure 5 As shown, when the first switch tube Q1 and the third switch tube Q3 receive the turn-on signal sent by the driver, the second switch tube Q2 and the fourth switch tube Q4 receive the turn-off signal sent by the driver, and there is a dead time between the turn-on time of the first switch tube Q1 and the turn-on time of the second switch tube Q2, and at the same time, there is a dead time between the turn-on time of the third switch tube Q3 and the turn-on time of the fourth switch tube Q4.

[0070] In this technical solution, a unidirectional conductive device D0 is connected between the output end of the comparison module and the control end of the switch tube. The unidirectional conductive device D0 is turned on only when the comparison module outputs a cutoff signal, that is, the switch tube is directly turned off. When the cutoff signal is not output, the control end of the switch tube receives the control signal of the driver and is turned on or off according to the control signal.

[0071] In any of the above technical solutions, optionally, it also includes: a power factor correction module, the power factor correction module includes two half-bridge circuits 100 connected in parallel, respectively recorded as a first half-bridge circuit 100 and a second half-bridge circuit 100; a driver, the driver is connected to the output end of the Hall sensor S, if the driver detects that the power supply signal is greater than the bus voltage, and the sampling signal is greater than or equal to a preset voltage threshold, and the input current of the second half-bridge circuit 100 is greater than or equal to a preset current threshold, then the driver outputs a pulse drive signal to the first half-bridge circuit 100, wherein the pulse drive signal is configured to control the two switching tubes in the first half-bridge circuit 100 to be alternately turned on.

[0072] In this technical solution, the current size in the power supply signal is collected by the Hall sensor S, and when it is determined by comparison that the driving power supply signal is greater than the bus voltage, and the sampling signal is greater than or equal to the voltage threshold, and the input current of the second half-bridge circuit 100 is greater than or equal to the preset current threshold, the first half-bridge circuit 100 is controlled to start working, that is, the first half-bridge circuit 100 is controlled to work with a pulse drive signal. Usually, the first half-bridge circuit 100 works in a high-frequency mode, and the switching frequency is greater than 1KHz to reduce the impact of abnormal circuit conditions on the switching tube.

[0073] In addition, if Figure 6 As shown, the driver can receive three overcurrent protection signals, as follows:

[0074] (1) a comparison signal 102 output by the first comparator C1 and / or the second comparator C2;

[0075] (2) A sampling signal 104 of the power supply signal output by the Hall sensor S.

[0076] Optionally, the voltage threshold value ranges from 0 to 200V, and the current threshold value ranges from 0 to 10A.

[0077] Among them, the power factor correction module includes two parallel half-bridge circuits 100, and switching tubes are provided in the four bridge arms, that is, a totem pole PFC (Power Factor Correction) module is formed. Optionally, the upper switching tube in the half-bridge circuit 100 is an NPN transistor, the lower switching tube is a PNP transistor, and the upper switching tube and the lower switching tube are connected with a common emitter, and the emitter is also an output end of the above-mentioned totem pole PFC module.

[0078] Optionally, the switch tube in the totem pole PFC module can also be set to a MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor), and the switch tube can also be an S i C-type switch tube or G a N-type switching tube, therefore, the switching frequency of the switching tube can be further increased. Although it can further improve the load operation energy efficiency, the electromagnetic interference signal is stronger, which requires the addition of a filtering module to reduce the electromagnetic interference signal.

[0079] Optionally, a reverse freewheeling diode is integrated between the source (emitter) and the drain (collector) of the switch tube of the totem pole type PFC.

[0080] In any of the above technical solutions, optionally, the first half-bridge circuit includes a first switch tube Q1 and a second switch tube Q2, the second half-bridge circuit includes a third switch tube Q3 and a fourth switch tube Q4, the common end between the first switch tube Q1 and the second switch tube Q2 is connected to the first line of the power supply signal, the common end between the third switch tube Q3 and the fourth switch tube Q4 is connected to the second line of the power supply signal, and the common end between the first switch tube Q1 and the fourth switch tube Q4 is connected to the high-voltage bus in the bus circuit, and the common end between the second switch tube Q2 and the third switch tube Q3 is connected to the low-voltage bus, wherein when the power supply signal is a positive half-wave signal, the driver controls the third switch tube Q3 to turn on, and at the same time, the driver controls the fourth switch tube Q4 to turn off, and when the power supply signal is a negative half-wave signal, the driver controls the third switch tube Q3 to turn off, and at the same time, the driver controls the fourth switch tube Q4 to turn on.

[0081] In any of the above technical solutions, optionally, the switching tube is a metal oxide semiconductor field effect transistor 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, a reverse freewheeling diode is connected between the source and the drain of the metal oxide semiconductor field effect transistor, the base of the insulated gate bipolar transistor is connected to the command output terminal of the controller, and a reverse freewheeling diode is connected between the emitter and the collector of the insulated gate bipolar transistor.

[0082] The metal oxide semiconductor field effect transistor can be a depletion mode field effect transistor or an enhancement mode field effect transistor, or an S i C transistor or G a N transistor.

[0083] In any of the above technical solutions, optionally, it also includes: an electrolytic capacitor E, which is arranged at the output end of the power factor correction module, and the electrolytic capacitor E is configured to receive the pulsating DC signal and convert it into a DC signal; an inverter, which is connected to the output end of the electrolytic capacitor E, and the inverter is configured to control the DC signal to power the load.

[0084] In this technical solution, by setting an electrolytic capacitor E at the output end of the half-bridge circuit 100, on the one hand, the electrolytic capacitor E can provide power for load operation, and on the other hand, the electrolytic capacitor E can also absorb the surge signal contained in the drive control circuit, which can further reduce the electromagnetic interference signal and noise flowing to the inverter, which is beneficial to improving the reliability of load operation.

[0085] If the inverter includes two half-bridge circuits 100 connected in parallel, a single-phase load can be driven to operate. If the inverter includes three half-bridge circuits 100 connected in parallel, a three-phase load can be driven to operate.

[0086] In any of the above technical solutions, optionally, the capacitance of the electrolytic capacitor E ranges from 10uF to 20000uF.

[0087] In view of the technical problems existing in the prior art, the present invention proposes a drive control circuit and household appliance. By setting a Hall sensor and a comparison module in a half-bridge circuit to perform overcurrent protection and overvoltage protection on the switch tube, it can not only reduce the impact of parasitic capacitance and power supply signals on the half-bridge circuit, but also reduce the power consumption of the half-bridge circuit. In addition, since there is no need to set an isolation circuit for the half-bridge circuit, the cost of the drive control circuit is also reduced, thereby improving the reliability and stability of the drive control circuit.

[0088] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0089] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a controller of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the controller of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0090] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0091] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0092] It should be noted that in the claims, any reference signs placed between brackets shall not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claim. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The invention may be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

[0093] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0094] The above are only preferred embodiments of the present invention and are 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 half-bridge circuit, wherein the half-bridge circuit is connected to the bus circuit, and the half-bridge circuit is configured to convert the power supply signal, and the half-bridge circuit specifically includes: A switch tube, wherein the switch tube is configured to have a control terminal; A Hall sensor, wherein the Hall sensor is configured to sample the power supply signal to obtain a corresponding sampling signal; A comparison module, wherein a first input terminal of the comparison module is configured to receive a reference signal, and a second input terminal of the comparison module is configured to receive a sampling signal corresponding to the electrical signal; The parasitic capacitor is arranged between the control terminal and the output terminal of the switch tube. Wherein, the output end of the comparison module is connected to the control end of the switch tube, and if the absolute value of the sampling signal is greater than the reference signal, the comparison module outputs a cutoff signal to the switch tube; A power factor correction module, the power factor correction module comprising two half-bridge circuits connected in parallel, respectively denoted as a first half-bridge circuit and a second half-bridge circuit; A driver connected to the output end of the Hall sensor, if the driver detects that the power supply signal is greater than the bus voltage, the sampling signal is greater than or equal to a preset voltage threshold, and the input current of the second half-bridge circuit is greater than or equal to a preset current threshold, the driver outputs a pulse drive signal to the first half-bridge circuit, The pulse driving signal is configured to control the two switching tubes in the first half-bridge circuit to be turned on alternately.

2. The drive control circuit according to claim 1, characterized in that: The comparison module also includes: A first comparator, wherein a positive input terminal of the first comparator is connected to a first reference signal, a negative input terminal of the first comparator is connected to the sampling signal, and an output terminal of the first comparator is connected to a control terminal of the switch tube; and / or, a second comparator, wherein the negative input terminal of the second comparator is connected to the second reference signal, the positive input terminal of the second comparator is connected to the sampling signal, and the output terminal of the second comparator is connected to the control terminal of the switch tube, The reference signal is the first reference signal or the second reference signal.

3. The drive control circuit according to claim 1, characterized in that: Also includes: A unidirectional conductive element is connected in series between the output end of the comparison module and the control end of the switch tube, and the unidirectional conductive element is configured to unidirectionally transmit the cutoff signal to the control end of the switch tube.

4. The drive control circuit according to claim 1, characterized in that: Also includes: The first half-bridge circuit includes a first switch tube and a second switch tube, the second half-bridge circuit includes a third switch tube and a fourth switch tube, a common end between the first switch tube and the second switch tube is connected to the first line of the power supply signal, and a common end between the third switch tube and the fourth switch tube is connected to the second line of the power supply signal, The common end between the first switch tube and the fourth switch tube is connected to the high-voltage bus in the bus circuit, and the common end between the second switch tube and the third switch tube is connected to the low-voltage bus. Among them, when the power supply signal is a positive half-wave signal, the driver controls the third switch tube to be turned on, and at the same time, the driver controls the fourth switch tube to be turned off. When the power supply signal is a negative half-wave signal, the driver controls the third switch tube to be turned off, and at the same time, the driver controls the fourth switch tube to be turned on.

5. The drive control circuit according to any one of claims 1 to 4, characterized in that: The switch tube is a metal oxide semiconductor field effect transistor or an insulated gate bipolar transistor. Among them, the gate of the metal oxide semiconductor field effect transistor is connected to the command output end of the controller, a reverse freewheeling diode is connected between the source and the drain of the metal oxide semiconductor field effect transistor, the base of the insulated gate bipolar transistor is connected to the command output end of the controller, and a reverse freewheeling diode is connected between the emitter and the collector of the insulated gate bipolar transistor.

6. The drive control circuit according to any one of claims 1 to 4, characterized in that: Also includes: An electrolytic capacitor, disposed at an output end of the power factor correction module, the electrolytic capacitor being configured to receive a pulsating DC signal and convert it into a DC signal; An inverter is connected to the output end of the electrolytic capacitor, and the inverter is configured to control the DC signal to supply power to a load.

7. The drive control circuit according to claim 6, characterized in that: The capacitance value of the electrolytic capacitor ranges from 10uF to 20000uF.

8. A household appliance, characterized in that: include: load; The drive control circuit according to any one of claims 1 to 7, wherein the drive control circuit is configured to control the power supply signal to supply power to the load.

9. The household appliance according to claim 8, 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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