CN209930126U - Drive control circuit and household electrical appliance - Google Patents
Drive control circuit and household electrical appliance Download PDFInfo
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- CN209930126U CN209930126U CN201921044916.1U CN201921044916U CN209930126U CN 209930126 U CN209930126 U CN 209930126U CN 201921044916 U CN201921044916 U CN 201921044916U CN 209930126 U CN209930126 U CN 209930126U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model provides a drive control circuit and tame electric installation, wherein, control circuit includes: half-bridge circuit, half-bridge circuit inserts in the bus circuit, and half-bridge circuit is configured to carry out conversion processing to the power supply signal, and half-bridge circuit specifically includes: a switching tube configured to have a control end; a Hall sensor configured to sample a power supply signal to obtain a corresponding sampled signal; the first input end of the comparison module is configured to be connected with a reference signal, the second input end of the comparison module is configured to be connected with a sampling signal corresponding to the electric signal, 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 larger than the reference signal, the comparison module outputs a cut-off signal to the switch tube. Through the technical scheme of the utility model, realized overflowing the protection to functional circuit, avoided overflowing to the impact of switch tube, be favorable to promoting drive control circuit and household electrical appliances's reliability.
Description
Technical Field
The utility model relates to a drive control field particularly, relates to a drive control circuit and a household electrical appliances.
Background
In the current inverter air-conditioning market, in order to improve the operating energy efficiency of a load, a driving control circuit of a motor (load) is generally formed by a rectifier, an inductor, a PFC (power factor Correction) module, an electrolytic capacitor and an inverter.
In the related art, in order to reduce the power consumption of the BOOST PFC and the power consumption of the rectifier, the totem-pole PFC module is used to replace the BOOST PFC and the rectifier, but 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 configured to maintain the high-frequency operation.
Specifically, as shown in fig. 1, an inductor L, a totem-pole PFC (Power factor correction) module, an electrolytic capacitor E, and an inverter are used to form a driving control circuit of a motor (load), and the driving control circuit has at least the following technical defects in the operation process:
(1) because a large number of switching tubes (the first switching tube Q) are usually arranged in the totem-pole PFC module1A second switch tube Q2And a third switching tube Q3And a fourth switching tube Q4) And the switching tube operates at a high frequency, which may result in a large amount of higher harmonics in the drive control circuit.
(2) Based on the miller effect, the parasitic capacitance inherent in the switching tube may generate a large amount of peak voltage, peak current and power consumption, which may seriously affect the reliability of the totem-pole PFC module, the driving control circuit and the household appliance.
Moreover, any discussion of the prior art throughout the specification is not an admission that the prior art is necessarily known to a person of ordinary skill in the art, and any discussion of the prior art throughout the specification is not an admission that the prior art is necessarily widely known or forms part of common general knowledge in the field.
SUMMERY OF THE UTILITY MODEL
The present invention aims at least solving one of the technical problems existing in the prior art or the related art.
Therefore, an object of the present invention is to provide a driving control circuit.
It is yet another object of the present invention to provide a household appliance.
In an embodiment of the first aspect of the present invention, a driving control circuit is provided, including: the half-bridge circuit, the half-bridge circuit inserts in the bus circuit, the half-bridge circuit is configured to carry out conversion processing to the power supply signal, the half-bridge circuit specifically includes: a switching tube configured to have a control end; the Hall sensor is configured to sample a power supply signal to obtain a corresponding sampled signal; the first input end of the comparison module is configured to be connected with a reference signal, the second input end of the comparison module is configured to be connected with a sampling signal corresponding to the electric signal, 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 larger than the reference signal, the comparison module outputs a cut-off signal to the switch tube.
In the technical scheme, for a half-bridge circuit provided with at least two switching tubes, due to the parasitic capacitance existing between the control end and the output end of the switching tube, the parasitic capacitance can cause voltage interference between the two switching tubes under the amplification effect of the switching tubes, for example, at the moment when the second switching tube (denoted as a lower switching tube) starts to be conducted, the parasitic capacitance of the lower switching tube generates a peak voltage, and the peak voltage impacts the first switching tube in the form of peak current, so that the first switching tube (denoted as an upper switching tube) can be broken down, and further the half-bridge circuit is in fault, therefore, through arranging the hall sensor and the comparison module in the half-bridge circuit to perform overcurrent protection and overvoltage protection on the switching tubes, the impact of the parasitic capacitance and a power supply signal on the half-bridge circuit can be reduced, the power consumption of the half-bridge circuit can be reduced, in addition, because the half-bridge circuit does not need to be provided with an isolation circuit, the cost of the drive control circuit is reduced, and the reliability and the stability of the drive control circuit are further improved.
The output end of the comparison module is connected to the control end of the switch tube, if the absolute value of the sampling signal is greater than the reference signal, the comparison module outputs a cut-off signal to the switch tube, and particularly, when overcurrent protection or overvoltage protection is carried out, the switch tube does not need to be triggered to be cut off through a driver, so that the possibility that the switch tube is broken down can be further avoided.
In addition, the Hall sensor is arranged to sample the electric signal flowing through the half-bridge circuit, the sampling result is transmitted to the driver, and the switching frequency is adjusted according to the detection result, for example, when the current in the power supply signal is detected to carry more peak signals, in order to avoid the peak signals from being amplified and superposed through the half-bridge circuit, the switching frequency can be reduced to reduce the electromagnetic interference signals and the peak signals.
In addition, according to the drive control circuit of the above embodiment of the present invention, the following additional technical features may also be provided:
in any one of the above technical solutions, optionally, the turn-on voltage of the switching tube is greater than zero, and the comparison module further includes: a positive input end of the first comparator is connected with a first reference signal, a negative input end of the first comparator is connected with the sampling signal, and an output end of the first comparator is connected to a control end of the switching tube; and/or a second comparator, a negative input end of the second comparator is connected to a second reference signal, a positive input end of the second comparator is connected to the sampling signal, and an output end of the second comparator is connected to the control end of the switch tube, wherein the reference signal is the first reference signal or the second reference signal.
In the technical scheme, the on-state voltage of the switching tube is greater than zero, namely the switching tube is an N-type metal oxide semiconductor field effect transistor or an NPN-type triode, and the switching tube is turned on when a driving signal of a control end (a grid or a base) is in a high level.
Further, the first comparator is configured to compare a magnitude relationship between the sampling signal of the positive half shaft and the first reference signal, and according to the connection manner, if the positive sampling signal is greater than the first reference signal, the first comparator outputs a low level signal, and similarly, the second comparator is configured to compare a magnitude relationship between the sampling signal of the negative half shaft and the second reference signal, and according to the connection manner, if the negative sampling signal is less than the second reference signal, the second comparator outputs a low level signal, and the low level signal is transmitted to the control terminal of the switching tube (the N-type metal oxide semiconductor field effect transistor or the NPN type triode), that is, the low level signal is used as a cut-off signal to directly control the switching tube to be cut off.
In summary, as long as the amplitude of the sampling signal is greater than the reference signal, the comparison module outputs a cut-off signal to the control end of the switching tube to directly turn off the switching tube, thereby improving the reliability of overcurrent protection (or overvoltage protection) and shortening the response time of overcurrent protection (or overvoltage protection).
In any of the above technical solutions, optionally, the method further includes: the unidirectional conducting element is connected between the output end of the comparison module and the control end of the switch tube in series, and the unidirectional conducting element is configured to transmit the cut-off signal to the control end of the switch tube in a unidirectional mode.
In the technical scheme, the unidirectional conducting element is connected to the output end of the comparison module and the control end of the switch tube, the unidirectional conducting device is conducted only when the comparison module outputs a cut-off signal, namely the switch tube is directly turned off, and the control end of the switch tube receives a control signal of the driver and is conducted or cut off according to the control signal when the cut-off signal is not output.
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 direct current signal, and if the input end of the half-bridge circuit is connected to a direct current signal, the output end of the half-bridge circuit outputs a power supply signal.
In the technical scheme, each bridge arm of the half-bridge circuit comprises at least one switching tube, and the switching tubes are turned on and off to realize conversion processing of the power supply signal, generally, the input power supply signal is converted into a direct current signal, or the input direct current signal is converted into the power supply signal so as to drive the load to reliably operate.
In any of the above technical solutions, optionally, the method further includes: the power factor correction module comprises two half-bridge circuits which are connected in parallel and are respectively marked as a first half-bridge circuit and a second half-bridge circuit; the driver is connected to the output end of the Hall sensor, and 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 value, and the input current of the second half-bridge circuit is greater than or equal to a preset current threshold value, the driver outputs a pulse driving signal to the first half-bridge circuit, wherein the pulse driving signal is configured to control two switching tubes in the first half-bridge circuit to be alternately switched on.
In the technical scheme, the current magnitude in the power supply signal is collected through the Hall sensor, and the driving power supply signal is determined to be larger than the bus voltage through comparison, and when the sampling signal is larger than or equal to the voltage threshold, and the input current of the second half-bridge circuit is larger than or equal to the preset current threshold, the first half-bridge circuit is controlled to start working, namely the first half-bridge circuit is controlled to work by the pulse driving signal, usually, the first half-bridge circuit works in a high-frequency mode, the switching frequency is larger than 1KHz, and the impact of the abnormal state of the circuit on the switching tube is reduced.
The Power Factor Correction module comprises two half-bridge circuits connected in parallel, and switching tubes are arranged in four bridge arms, so that a totem-pole PFC (Power Factor Correction) module is formed.
Optionally, the voltage threshold value ranges from 0 to 200V, and the current threshold value ranges from 0 to 10A.
Alternatively, the switching tube in the totem-pole PFC module may be a Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET), and the switching tube may be an SiC-type switching tube or GaThe N-type switch tube can further improve the switching frequency of the switch tube, and can further improve the load operation energy efficiency, but the electromagnetic interference signal is stronger, so that a filtering module is required to be added to reduce the electromagnetic interference signal.
Optionally, a reverse freewheeling diode is integrated between the source (emitter) and the drain (collector) of the switching tube of the totem-pole PFC.
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, a common end between the first switch tube and the second switch tube is connected to the first line of the power supply signal, a common end between the third switch tube and the fourth switch tube is connected to the second line of the power supply signal, and a common end between the first switch tube and the fourth switch tube is connected to the high-voltage bus in the bus circuit, a common end between the second switch tube and the third switch tube is connected to the low-voltage bus, where when the power supply signal is a positive half-wave signal, the driver controls the third switch tube to be turned on, and simultaneously, the driver controls the fourth switch tube to be turned off, and when the power supply signal is a negative half-wave signal, the driver controls the third switch tube to be switched off, and simultaneously, the driver controls the fourth switch tube to be switched on.
In any of the above technical solutions, optionally, the switch tube is a metal oxide semiconductor field effect transistor or an insulated gate bipolar transistor, wherein a gate of the metal oxide semiconductor field effect transistor is connected to an instruction output end of the controller, a reverse freewheel diode is connected between a source and a drain of the metal oxide semiconductor field effect transistor, a base of the insulated gate bipolar transistor is connected to the instruction output end of the controller, and a reverse freewheel diode is connected between an emitter and a collector of the insulated gate bipolar transistor.
The metal oxide semiconductor field effect transistor can be a depletion type field effect transistor or an enhancement type field effect transistor, and S can be selectediC transistor or GaAnd an N transistor.
In any of the above technical solutions, optionally, the method further includes: the electrolytic capacitor is arranged at the output end of the power factor correction module and is configured to receive the pulsating direct current signal and convert the pulsating direct current signal into a direct current signal; an inverter connected to an output of the electrolytic capacitor, the inverter configured to control the DC signal to power a load.
In this technical scheme, through setting up electrolytic capacitor at half-bridge circuit's output, on the one hand, electrolytic capacitor can provide the electric quantity of load operation, and on the other hand, electrolytic capacitor also can absorb the surge signal that contains among the drive control circuit, can further reduce the electromagnetic interference signal and the noise that flow to the dc-to-ac converter, is favorable to promoting the reliability of load operation.
If the inverter comprises two half-bridge circuits connected in parallel, the inverter can drive a single-phase load to operate, and if the inverter comprises three half-bridge circuits connected in parallel, the inverter can drive a three-phase load to operate.
In any of the above technical solutions, optionally, a value range of a capacitance value of the electrolytic capacitor is 10uF to 20000 uF.
In a second aspect of the present invention, a household electrical appliance is provided, including: a load; the drive control circuit according to any one of the aspects of the present invention, the dynamic control circuit is configured to control the power supply signal to supply power to the load.
In this technical solution, the home appliance includes the driving control circuit described in the above technical solution, so that the home appliance includes all the beneficial effects of the driving control circuit described in the above technical solution, and details are not repeated again.
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 dust collector, and a computer host.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a schematic diagram of a drive control circuit of one embodiment in the prior art;
fig. 2 shows a timing diagram of a drive control circuit according to an embodiment of the present invention;
fig. 3 shows a schematic diagram of a drive control circuit according to an embodiment of the invention;
fig. 4 shows a schematic diagram of a drive control circuit according to another embodiment of the present invention;
fig. 5 shows a schematic diagram of a drive control circuit according to another embodiment of the present invention;
fig. 6 shows a schematic diagram of a drive control circuit according to another embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
The following describes a drive control circuit and a home appliance according to an embodiment of the present invention with reference to fig. 1 to 5.
As shown in fig. 1, after the Power supply signal AC is input to the driving control circuit, the driving control circuit of the motor (load) is generally composed of an inductor L, a totem-pole PFC (Power Factor Correction) module, an electrolytic capacitor E and an inverter, and a large number of switching tubes (first switching tubes Q) are generally arranged in the totem-pole PFC module1A second switch tube Q2And a third switching tube Q3And a fourth switching tube Q4) In addition, a hall sensor S is provided in the charging circuit of the inductor L, and a current is detected based on the hall sensor S.
As shown in fig. 1, the first switch tube Q1Is provided with a first reverse freewheeling diode D between the source and the drain1A second switch tube Q2Between the source and the drain of the first diode and a second reverse freewheeling diode D is arranged2A third switching tube Q3Is provided with a third reverse freewheeling diode D between the source and the drain3Fourth switch tube Q4Is provided with a fourth reverse freewheeling diode D between the source and the drain4。
As shown in fig. 2, a totem-pole PFC (Power Factor Correction) module generally operates in the following mode:
(1) at T0～T3In time interval, it is recorded as AC voltage USThe controller is connected to the first switch tube Q1And a second switching tube Q2A first switch tube Q for outputting pulse drive signal1The duty ratio of (1) is a variable value (increased from small to large or decreased from large to small) or a preset constant value, and the first switch tube Q1On-time of and the second switching tube Q2The conduction time of the third switching tube Q is complementary3On and the fourth switch tube Q4And (6) cutting off.
(2) At T3～T6In time interval, it is recorded as AC voltage USThe controller to the first switch tube Q1And a second switching tube Q2A first switch tube Q for outputting pulse drive signal1The duty ratio of (1) is a variable value (increased from small to large or decreased from large to small) or a preset constant value, and the first switch tube Q1On-time of and the second switching tube Q2The conduction time of the third switching tube Q is complementary3Cut off and the fourth switch tube Q4And conducting.
As shown in fig. 3, in a totem-pole PFC (Power Factor Correction) module, if the switch tube is an N-type MOSFET, the parasitic capacitance C isdgThe generated peak current IdgThe direction is from the grid to the drain, and the second switch tube Q2The peak current of (2) will cause the first switch tube Q1The gate of the transistor generates a spike voltage which may break down the first switching tube Q1。
Wherein, the controller is connected to the driver and drives the switch tube to be turned on or off through the driver, such as the first switch tube Q1Between the gate and the driver is connected a first resistor R1(mainly for current and voltage limiting), a first switching tube Q1A second resistor R is connected between the grid electrode and the source electrode2(mainly for drive conduction), the second switch tube Q2Is connected to a third resistor R between the gate and the driver3(mainly for current and voltage limiting)) A second switch tube Q2A fourth resistor R is connected between the grid electrode and the source electrode4(mainly for driving conduction).
As shown in fig. 4, 5 and 6, a drive control circuit according to an embodiment of the present invention includes: a half-bridge circuit 100, the half-bridge circuit 100 is connected to a bus circuit, the half-bridge circuit 100 is configured to perform conversion processing on a power supply signal AC, and the half-bridge circuit 100 specifically includes: a switching tube configured to have a control end; a Hall sensor S configured to sample a power supply signal AC to obtain a corresponding sampled signal; the first input end of the comparison module is configured to be connected with a reference signal, the second input end of the comparison module is configured to be connected with a sampling signal corresponding to the electric signal, 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 larger than the reference signal, the comparison module outputs a cut-off signal to the switch tube.
In this solution, for the half-bridge circuit 100 with at least two switching tubes, the parasitic capacitance C exists between the control end and the output end of the switching tubedgParasitic capacitance CdgThe amplification of the switching tube can cause voltage interference between the two switching tubes, e.g. the second switching tube Q2(written as lower switch tube) at the moment of starting to conduct, the parasitic capacitance C of the lower switch tubedgA peak voltage is generated which impacts the first switching tube Q in the form of a peak current1May result in the first switch tube Q1(note as the switching tube) is broken down, and then the half-bridge circuit 100 is in failure, so that overcurrent protection and overvoltage protection are carried out on the switching tube by arranging the hall sensor S and the comparison module in the half-bridge circuit 100, and the parasitic capacitance C can be reduceddgAnd the impact that power supply signal AC caused half-bridge circuit 100, can reduce half-bridge circuit 100's consumption moreover, in addition, owing to need not set up the buffer circuit for half-bridge circuit 100, also reduced drive control circuit's cost, and then promoted drive control circuit's reliability and stability。
The output end of the comparison module is connected to the control end of the switch tube, if the absolute value of the sampling signal is greater than the reference signal, the comparison module outputs a cut-off signal to the switch tube, and particularly, when overcurrent protection or overvoltage protection is carried out, the switch tube does not need to be triggered to be cut off through a driver, so that the possibility that the switch tube is broken down can be further avoided.
In addition, the hall sensor S is arranged to sample the electrical signal flowing through the half-bridge circuit 100, and transmit the sampling result to the driver, and adjust the switching frequency according to the detection result, for example, when it is detected that the current in the power supply signal AC carries more peak signals, in order to avoid the peak signals from being amplified and superimposed by the half-bridge circuit 100, the switching frequency can be reduced to reduce the electromagnetic interference signals and the peak signals.
Optionally, the sampling frequency range of the hall sensor S is 1KHz to 1000MHz, and the sampling signal is also used for closing control of the current loop.
In addition, according to the drive control circuit of the above embodiment of the present invention, the following additional technical features may also be provided:
in any one of the above technical solutions, optionally, the turn-on voltage of the switching tube is greater than zero, and the comparison module further includes: first comparator C1Said first comparator C1A positive input end of the first reference signal B is connected with a first reference signal B1Said first comparator C1The negative input terminal of the first comparator C is connected to the sampling signal1The output end of the switching tube is connected to the control end of the switching tube; and/or a second comparator C2Said second comparator C2The negative input end of the first reference signal is connected with a second reference signal B2Said second comparator C2The positive input end of the second comparator C is connected to the sampling signal2Is connected to the control end of the switching tube, wherein the reference signal is the first reference signal B1Or the second reference signal B2。
In the technical scheme, the on-state voltage of the switching tube is greater than zero, namely the switching tube is an N-type metal oxide semiconductor field effect transistor or an NPN-type triode, and the switching tube is turned on when a driving signal of a control end (a grid or a base) is in a high level.
As shown in FIG. 6, the first comparator C1For comparing the sampling signal of the positive half-shaft with a first reference signal B1The magnitude relation between the two signals is known from the above connection manner, if the positive sampling signal is larger than the first reference signal B1Then the first comparator C1Output a low level signal, and, similarly, a second comparator C2For comparing the sampled signal of the negative half-shaft with a second reference signal B2The magnitude relation between the two signals is known from the above connection, if the negative sampling signal is smaller than the second reference signal B2Then the second comparator C2And outputting a low-level signal, wherein the low-level signal is transmitted to a control end of a switching tube (an N-type metal oxide semiconductor field effect transistor or an NPN-type triode), namely, the low-level signal is used as a cut-off signal to directly control the switching tube to be cut off.
In summary, as long as the amplitude of the sampling signal is greater than the reference signal, the comparison module outputs a cut-off signal to the control end of the switching tube to directly turn off the switching tube, thereby improving the reliability of overcurrent protection (or overvoltage protection) and shortening the response time of overcurrent protection (or overvoltage protection).
In any of the above technical solutions, optionally, the method further includes: unidirectional conducting device D0Said one-way conduction device D0A one-way conduction device D connected in series between the output end of the comparison module and the control end of the switch tube0The control end is configured to transmit the cut-off signal to the switch tube in a single direction.
As shown in fig. 4 and 5, the first switching tube Q1And a third switching tube Q3When receiving the conducting signal sent by the driver, the second switch tube Q2And a fourth switching tube Q4Receiving a cut-off signal sent by the driver, and a first switch tube Q1On-time and second switching tube Q2There is a dead time between the on-times, and at the same time, the third switching tube Q3On-time and fourth switching transistor Q4Between the conduction times ofDuring the dead time.
In the technical scheme, the unidirectional conducting device D is connected to the output end of the comparison module and the control end of the switch tube0When the comparison module outputs the cut-off signal, the device D is turned on in one direction0And when the cut-off signal is not output, the control end of the switch tube receives the control signal of the driver and is switched on or off according to the control signal.
In any of the above technical solutions, optionally, the method further includes: a power factor correction module, which includes two parallel half-bridge circuits 100, and is respectively referred to as a first half-bridge circuit 100 and a second half-bridge circuit 100; and the driver is connected to the output end of the hall sensor S, and 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 100 is greater than or equal to a preset current threshold, the driver outputs a pulse driving signal to the first half-bridge circuit 100, wherein the pulse driving signal is configured to control two switching tubes in the first half-bridge circuit 100 to be alternately turned on.
In the technical scheme, the current magnitude in the power supply signal is collected through the hall sensor S, and it is determined through comparison that the driving power supply signal is greater than the bus voltage, and when 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 by the pulse driving signal, generally, the first half-bridge circuit 100 works in a high-frequency mode, and the switching frequency is greater than 1KHz, so as to reduce the impact of the abnormal state of the circuit on the switching tube.
In addition, as shown in fig. 6, the driver can receive three paths of overcurrent protection signals, which are as follows:
(1) first comparator C1And/or a second comparator C2The output comparison signal 102;
(2) a sampled signal 104 of the supply signal output by the hall sensor S.
Optionally, the voltage threshold value ranges from 0 to 200V, and the current threshold value ranges from 0 to 10A.
The Power Factor Correction module includes two half-bridge circuits 100 connected in parallel, and switching tubes are respectively disposed in four bridge arms, so as to form a totem-pole PFC (Power Factor Correction) module, optionally, an upper switching tube in the half-bridge circuit 100 is an NPN-type triode, a lower switching tube is a PNP-type triode, the upper switching tube and the lower switching tube are connected by a common emitter, and the emitter is also an output end of the totem-pole PFC module.
Alternatively, the switching tube in the totem-pole PFC module may be a Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET), and the switching tube may be an SiC-type switching tube or GaThe N-type switch tube can further improve the switching frequency of the switch tube, and can further improve the load operation energy efficiency, but the electromagnetic interference signal is stronger, so that a filtering module is required to be added to reduce the electromagnetic interference signal.
Optionally, a reverse freewheeling diode is integrated between the source (emitter) and the drain (collector) of the switching tube of the totem-pole PFC.
In any of the above technical solutions, optionally, the first half-bridge circuit includes a first switch transistor Q1And a second switching tube Q2The second half-bridge circuit comprises a third switching tube Q3And a fourth switching tube Q4The first switch tube Q1And the second switching tube Q2The common end between the first and the second switching tubes is connected with the first line of the power supply signal, and the third switching tube Q3And the fourth switching tube Q4A second line between which the common terminal is connected to the power supply signal, and the first switch tube Q1And the fourth switching tube Q4The common end between the two is connected to a high-voltage bus in the bus circuit, and the second switching tube Q2And the third switch tube Q3The common end between the two is connected with the low-voltage bus, wherein when the power supply signal is a positive half-wave signal,the driver controls the third switch tube Q3Conducting, simultaneously, the driver controls the fourth switch tube Q4When the power supply signal is a negative half-wave signal, the driver controls the third switching tube Q3When the fourth switch tube Q is cut off, the driver controls the fourth switch tube Q4And conducting.
In any of the above technical solutions, optionally, the switch tube is a metal oxide semiconductor field effect transistor or an insulated gate bipolar transistor, wherein a gate of the metal oxide semiconductor field effect transistor is connected to an instruction output end of the controller, a reverse freewheel diode is connected between a source and a drain of the metal oxide semiconductor field effect transistor, a base of the insulated gate bipolar transistor is connected to the instruction output end of the controller, and a reverse freewheel diode is connected between an emitter and a collector of the insulated gate bipolar transistor.
The metal oxide semiconductor field effect transistor can be a depletion type field effect transistor or an enhancement type field effect transistor, and S can be selectediC transistor or GaAnd an N transistor.
In any of the above technical solutions, optionally, the method further includes: the electrolytic capacitor E is arranged at the output end of the power factor correction module and is configured to receive the pulsating direct current signal and convert the pulsating direct current signal into a direct current signal; an inverter connected to an output of the electrolytic capacitor E, the inverter configured to control the DC signal to power a load.
In this technical scheme, through set up electrolytic capacitor E at half-bridge circuit 100's output, electrolytic capacitor E can provide the electric quantity of load operation on the one hand, and on the other hand, electrolytic capacitor E also can absorb the surge signal that contains in the drive control circuit, can further reduce the electromagnetic interference signal and the noise that flow to the inverter, is favorable to promoting the reliability of load operation.
If the inverter includes two half-bridge circuits 100 connected in parallel, the inverter can drive a single-phase load to operate, and if the inverter includes three half-bridge circuits 100 connected in parallel, the inverter can drive a three-phase load to operate.
In any of the above technical solutions, optionally, a value range of a capacitance value of the electrolytic capacitor E is 10uF to 20000 uF.
To the technical problem who exists among the prior art, the utility model provides a drive control circuit and household electrical appliances, through set up hall sensor and comparison module in half-bridge circuit to carry out overcurrent protection and overvoltage protection to the switch tube, not only can reduce parasitic capacitance and the impact that supply signal led to the fact to half-bridge circuit, and can reduce half-bridge circuit's consumption, in addition, owing to need not set up isolating circuit for half-bridge circuit, drive control circuit's cost has also been reduced, and then promoted drive control circuit's reliability and stability.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a controller of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the controller of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention can be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A drive control circuit, comprising:
the half-bridge circuit, the half-bridge circuit inserts in the bus circuit, the half-bridge circuit is configured to carry out conversion processing to the power supply signal, the half-bridge circuit specifically includes:
a switching tube configured to have a control end;
a Hall sensor configured to sample a power supply signal to obtain a corresponding sampled signal;
a comparison module, a first input end of which is configured to be connected to a reference signal, and a second input end of which is configured to be connected to a sampling signal corresponding to the electrical signal,
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 cut-off signal to the switch tube.
2. The driving control circuit of claim 1, wherein the comparing module further comprises:
a positive input end of the first comparator is connected with a first reference signal, a negative input end of the first comparator is connected with the sampling signal, and an output end of the first comparator is connected to a control end of the switching tube;
and/or a second comparator, a negative input end of the second comparator is connected to a second reference signal, a positive input end of the second comparator is connected to the sampling signal, an output end of the second comparator is connected to the control end of the switch tube,
wherein the reference signal is the first reference signal or the second reference signal.
3. The drive control circuit according to claim 1, further comprising:
the unidirectional conducting element is connected between the output end of the comparison module and the control end of the switch tube in series, and the unidirectional conducting element is configured to transmit the cut-off signal to the control end of the switch tube in a unidirectional mode.
4. The drive control circuit according to claim 1,
the power factor correction module comprises two half-bridge circuits which are connected in parallel and are respectively marked as a first half-bridge circuit and a second half-bridge circuit;
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, the sampling signal is greater than or equal to a preset voltage threshold value, and the input current of the second half-bridge circuit is greater than or equal to a preset current threshold value, the driver outputs a pulse driving signal to the first half-bridge circuit,
wherein the pulse driving signal is configured to control two switching tubes in the first half-bridge circuit to be alternatively conducted.
5. The drive control circuit according to claim 4, characterized by further comprising:
the first half-bridge circuit comprises a first switch tube and a second switch tube, the second half-bridge circuit comprises 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 a first line of the power supply signal, a common end between the third switch tube and the fourth switch tube is connected to a second line of the power supply signal,
the common end between the first switching tube and the fourth switching tube is connected to a high-voltage bus in the bus circuit, the common end between the second switching tube and the third switching tube is connected to a low-voltage bus,
when the power supply signal is a positive half-wave signal, the driver controls the third switch tube to be switched on, and simultaneously controls the fourth switch tube to be switched off, and when the power supply signal is a negative half-wave signal, the driver controls the third switch tube to be switched off, and simultaneously, the driver controls the fourth switch tube to be switched on.
6. The drive control circuit according to any one of claims 1 to 5,
the switch tube is a metal oxide semiconductor field effect transistor or an insulated gate bipolar transistor,
the gate of the metal oxide semiconductor field effect transistor is connected to an instruction output end of the controller, a reverse freewheeling diode is connected between the source electrode and the drain electrode of the metal oxide semiconductor field effect transistor, the base electrode of the insulated gate bipolar transistor is connected to the instruction output end of the controller, and a reverse freewheeling diode is connected between the emitter electrode and the collector electrode of the insulated gate bipolar transistor.
7. The drive control circuit according to claim 4 or 5, characterized by further comprising:
the electrolytic capacitor is arranged at the output end of the power factor correction module and is configured to receive the pulsating direct current signal and convert the pulsating direct current signal into a direct current signal;
an inverter connected to an output of the electrolytic capacitor, the inverter configured to control the DC signal to power a load.
8. The drive control circuit according to claim 7,
the capacitance value range of the electrolytic capacitor is 10 uF-20000 uF.
9. An appliance, comprising:
a load;
the drive control circuit of any one of claims 1 to 8, configured to control a supply signal to supply power to a load.
10. The home device of claim 9,
the household appliance comprises at least one of an air conditioner, a refrigerator, a fan, a range hood, a dust collector and a computer host.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921044916.1U CN209930126U (en) | 2019-07-05 | 2019-07-05 | Drive control circuit and household electrical appliance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921044916.1U CN209930126U (en) | 2019-07-05 | 2019-07-05 | Drive control circuit and household electrical appliance |
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| CN209930126U true CN209930126U (en) | 2020-01-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110299824A (en) * | 2019-07-05 | 2019-10-01 | 广东美的制冷设备有限公司 | Drive control circuit and household appliance |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110299824A (en) * | 2019-07-05 | 2019-10-01 | 广东美的制冷设备有限公司 | Drive control circuit and household appliance |
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