CN209860795U - Power factor correction circuit and air conditioner - Google Patents
Power factor correction circuit and air conditioner Download PDFInfo
- Publication number
- CN209860795U CN209860795U CN201920710867.4U CN201920710867U CN209860795U CN 209860795 U CN209860795 U CN 209860795U CN 201920710867 U CN201920710867 U CN 201920710867U CN 209860795 U CN209860795 U CN 209860795U
- Authority
- CN
- China
- Prior art keywords
- module
- switch
- factor correction
- power factor
- switching tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
Landscapes
- Rectifiers (AREA)
Abstract
The utility model provides a power factor correction circuit and air conditioner, wherein, power factor correction circuit includes: the alternating current input end of the power factor correction module is connected to an alternating current power supply and used for rectifying the alternating current power supply into direct current output; the switch driving module is connected to the driving input end of the power factor correction module and used for outputting a switch signal to the power factor correction module; the control module is connected to the switch driving module and used for controlling the on or off of the driving output of the switch driving module; the Hall current sensor is arranged on the alternating current input side of the power factor correction module; and the driving protection module is connected with the Hall current sensor and the control module and used for determining whether to output a protection signal to the control module according to the relation between the sampling signal and the corresponding first safety threshold value. Through the technical scheme of the utility model, whether unusual appears in detection rectifier that can be more direct to and when confirming to appear unusually, can confirm the unusual part that corresponds under the operating mode of difference.
Description
Technical Field
The utility model relates to an air conditioner technical field particularly, relates to a power factor correction circuit and an air conditioner.
Background
In the related art, a power factor correction circuit (i.e., a PFC circuit) adopts a high-power MOS (metal-oxide-semiconductor) switching technology as a main power device to replace an IGBT (insulated gate bipolar transistor) device, and utilizes a characteristic of MOS low on-resistance to replace a characteristic of constant IGBT on-voltage drop to reduce power consumption under medium and small power, so as to reduce power consumption of an air conditioner.
Adopt four switch tubes to constitute power factor correction module to adopt two half-bridge driver chips drives, one of them driver chip has a protect function, combines sampling resistor to carry out overcurrent detection, if detect heavy current, then trigger and close the drive output to four switches, in order to carry out overcurrent protection, but this scheme has following defect:
as shown in fig. 1, the existing protection scheme can only achieve detection when upper and lower Q1 and Q3 are abnormal, or upper and lower Q2 and Q4 are abnormal, and in practical application, the upper and lower switching tubes can be provided with an interlocking protection circuit due to the fact that the switch driving module can be internally provided with an interlocking protection circuit, and the upper and lower bridge arms are directly connected with each other and are difficult to appear, so that the probability of occurrence of a fault corresponding to the protection scheme is low, and the practicability is poor.
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 power factor correction circuit.
Another object of the present invention is to provide an air conditioner.
In order to achieve the above object, according to an embodiment of the first aspect of the present invention, there is provided a power factor correction circuit including: the power factor correction module receives a power supply signal and comprises a switch tube which is configured to control the power supply signal to supply power to a load; the switch driving module is connected to the driving input end of the power factor correction module and used for outputting a switch signal to the power factor correction module; the control module is connected to the switch driving module and used for controlling the switch driving module to be switched on and output the switch signal or switched off and output the switch signal; the current sensor, which can be a hall current sensor specifically, is arranged on the input side of the power factor correction module to collect input current and determine the input current as a sampling signal; and the drive protection module is connected with the Hall current sensor and the control module, and outputs a protection signal to the control module if the sampling signal is greater than a first safety threshold value, wherein the protection signal is used for triggering the control module to close the output of the switch drive module.
In the technical scheme, a Hall current sensor is arranged at an alternating current input end of a power factor correction module, the Hall current sensor collects input current or output current of the power factor correction module based on the arranged position, converts the current into a sampling signal and outputs the sampling signal to a driving protection module, so that the driving protection module detects whether an overcurrent phenomenon occurs or not, and controls to stop outputting a switching signal to the power factor correction module under the condition of detecting the overcurrent phenomenon, on one hand, because the Hall current sensor is not in electrical contact with a detected circuit, the power of the detected power supply can not be consumed, the high-efficiency low-power consumption control of the frequency conversion equipment is not influenced, on the other hand, because the Hall current sensor directly collects the current at the input end of the power factor correction module, different corresponding current flow paths of the power factor correction module can carry out circuit abnormity detection through the Hall current sensor when executing different functional operations, therefore, whether the rectifier is abnormal or not can be detected more directly, corresponding abnormal parts can be determined under different working conditions when the abnormity is determined, and compared with the scheme that the overcurrent detection is carried out by combining the driving chip with the protection function with the sampling resistor in the prior art, the overcurrent detection device is smaller in limitation and has pertinence and practicability.
The first safety threshold is a safety threshold of the voltage at the input end.
The Hall current sensor is a sensor which converts primary large current into secondary micro sampling signals by utilizing a Hall effect, and is combined with an operational amplifier to amplify the micro sampling signals into standard voltage, namely the Hall current sensor outputs the sampling signals to the outside and compares the sampling signals with a safety threshold value arranged in a drive protection module, and whether a short circuit overcurrent phenomenon occurs in a circuit is determined according to a comparison result.
In the above technical solution, optionally, the method further includes: and the sampling resistor is arranged at the negative electrode output end of the power factor correction module and is connected to the driving protection module, and the driving protection module outputs the protection signal to the control module when detecting that the voltage drop on the sampling resistor exceeds a second safety threshold.
In the technical scheme, a Hall current sensor is connected in series with an alternating current side of a power factor correction module and is used for detecting the current of the alternating current side, then a sampling signal output by the sensor is used as an input signal of a driving protection module, a sampling resistor connected in series with a negative electrode output end of the power factor correction module is combined, the voltage detected by the sampling resistor is also input into the driving protection module, when any one of the two paths of input voltages exceeds the preset voltage of the current detection and driving protection module, the protection of the current detection and driving protection module is triggered, and the power factor correction module is switched off, so that the detection function of the overcurrent phenomenon can be realized on the input side and the output side.
The second safety threshold is a voltage safety threshold of the negative output end of the power factor correction module.
In any one of the above technical solutions, optionally, the method further includes: the reactor is arranged between the power factor correction module and an alternating current power supply; the zero-crossing detection module is arranged between a live wire end and a zero line end of the alternating current power supply and is connected to the control module, and the zero-crossing detection module is used for acquiring a zero-crossing detection signal between the live wire end and the zero line end; the control module is further configured to: and determining the phase state of the alternating current power supply according to the zero-crossing detection signal output by the zero-crossing detection module, and outputting a switch control signal to the switch driving module according to the phase state so as to control the charging of the reactor, wherein the alternating current power supply is used for outputting the power supply signal.
In this technical solution, by providing the reactor between the ac input terminal of the power factor correction module and the ac power supply, when the ac power supply performs ac output, the reactor can convert electric energy supplied from the ac power supply into magnetic energy to be stored as energy, and can realize boosting of the PFC circuit and improvement of the power factor by releasing the energy.
Specifically, a zero-crossing detection module is arranged between the live wire and the zero wire, so that the zero-crossing detection module judges the real-time phase of the alternating current power supply, different switching devices in the power factor correction module are driven to execute switching operation according to different phase states, a rectification function or a Power Factor Correction (PFC) function is respectively realized, and therefore direct current power supply of a load end is realized based on the rectification function, or the alternating current side voltage and the alternating current side current are consistent in phase through PFC control.
In addition, the overcurrent phenomenon is caused by various reasons, such as that the circuit is disturbed to cause the control module to be halted and reset, or the short circuit abnormality occurs to the reactor, and the like.
In any one of the above technical solutions, optionally, the hall current sensor is disposed between the ac power supply and the reactor; the drive protection module is further configured to: and if the sampling signal is detected to be larger than a first safety threshold value, outputting the protection signal to the control module to close the output of the switch driving module.
The Hall current sensor can be placed at any position of a live wire or a zero wire in series connection with the reactor.
In any of the above technical solutions, optionally, the power factor correction module is formed by configuring a first switching tube, a second switching tube, a third switching tube and a fourth switching tube, the first switching tube and the second switching tube are disposed on the upper portion of the power factor correction module, the third switching tube and the fourth switching tube are disposed on the lower portion of the power factor correction module, the first switching tube and the third switching tube are disposed on the left portion of the power factor correction module, the second switching tube and the fourth switching tube are disposed on the right portion of the power factor correction module, the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are connected in parallel in opposite directions with a freewheeling diode, a drain electrode of the first switching tube is connected in series with a drain electrode of the second switching tube, a connection point is determined as a positive output end of the power factor correction module, a source electrode of the third switching tube is connected in series with a source electrode of the fourth switching tube, and determining a connection point as the negative output end to be connected with the sampling resistor in series and then grounded, connecting the source electrode of the first switch tube with the drain electrode of the third switch tube in series, connecting the connection point to the live wire end, connecting the source electrode of the second switch tube with the drain electrode of the fourth switch tube in series, and connecting the connection point to the zero wire end.
Specifically, the first switch tube, the second switch tube, the third switch tube and the fourth switch tube may be Metal-Oxide-Semiconductor Field-Effect transistors (MOS tubes), such as super-junction MOSFETs or SiC-MOSFETs.
The MOS tube works in a mode that the grid electrode controls the on-off between the source electrode and the drain electrode to realize the switch, and the grid electrode power supply is required to be larger than the source electrode power supply when the MOS tube is switched on.
In the technical scheme, a power factor correction module consisting of four switching tubes is arranged, and a control circuit respectively executes rectification operation or power factor correction operation by combining a control command output by the control module, when the power factor correction module is used as a component of a motor driving system, the power factor correction module alternately performs power factor improvement action and synchronous rectification action to boost the voltage so as to achieve the purpose of improving the allowable limit of the rotating speed of the motor, in the working process, a current transformer and a Hall current inductor are additionally arranged in the circuit to detect the running current, and in the case of detecting the current abnormity, the power factor correction module is controlled to stop working, and the power factor correction module is operated again after the abnormity is eliminated, so that the safety of the motor driving process is ensured.
In the technical scheme, a Hall current sensor is arranged at an alternating current input end of a power factor correction module, and no matter rectification operation or power factor correction operation is carried out, current flows through the Hall current sensor, so that when the current is detected to flow through a Hall device, the device outputs corresponding voltage, a voltage value needing to be protected is set in an overcurrent detection unit arranged in a driving protection module or the Hall current sensor according to the current value capable of being born by four switching tubes of the power factor correction module, a first switching tube and a second switching tube are connected in series between a live wire and a zero wire, a third switching tube and a fourth switching tube are connected in series between the live wire and the zero wire, and when abnormal overcurrent occurs in the first switching tube, the second switching tube or the third switching tube and the fourth switching tube, the current outputs corresponding voltage through the Hall current sensor and triggers the driving protection module, and then the switching signal of the switch driving module is turned off, so that the overcurrent of the switching tube is realized through protection, when the overcurrent signal is removed, the drive protection module removes the control on the overcurrent switch driving module to recover normal work, so that the timely and effective detection on the fault with higher probability can be realized in the rectifying operation process or the power factor correction process, and the aim of improving the safety of the whole PFC circuit is fulfilled.
For the power factor correction circuit of the Hall current sensor and the sampling resistor, the voltage can be sampled based on the Hall current sensor and/or the sampling resistor in different current flow paths, and whether a short circuit phenomenon exists or not is determined according to the detection result of the sampling voltage, so that the detection requirements of different combination flow paths of a first switch tube, a second switch tube, a third switch tube and a fourth switch tube in the power factor correction module can be met.
In any one of the above technical solutions, optionally, the switch driving module includes a first switch driving module for driving the first switch tube and the third switch tube, and a second switch driving module for driving the second switch tube and the fourth switch tube, where if the driving protection module detects that the sampling signal is greater than a first safety threshold and/or the voltage drop is greater than a second safety threshold, the driving protection module triggers the control module to turn off the driving output of the first switch driving module and the second switch driving module.
In this technical scheme, the switch drive module includes first switch drive module and second switch drive module to realize the half-bridge drive of H bridge reorganizer.
In addition, as can be understood by those skilled in the art, when the control module controls the switch driving modules to stop driving the output, in order to simultaneously control the first switch driving module and the second switch driving module to stop outputting, the two switch driving modules have the same execution priority.
Specifically, a first switch tube and a third switch tube are driven by a first switch driving module, a second switch tube and a fourth switch tube are driven by a second switch driving module, a sampling signal output by a Hall current sensor and a voltage sampling signal of a sampling resistor are both connected to a driving protection module, and when the driving protection module detects that the voltage output by the Hall current sensor and the voltage sampling signal on the sampling resistor exceed a preset value, the first switch driving module and the second switch driving module are forcibly turned off, so that four switch tubes are protected.
The Hall current sensor is mainly used for detecting when the current passes through the first switch tube and the second switch tube in sequence or when the current passes through the third switch tube and the fourth switch tube in sequence and the short circuit is abnormal, and the sampling resistor is mainly used for detecting when the current passes through the first switch tube and the third switch tube in sequence or when the current passes through the second switch tube and the fourth switch tube in sequence and the short circuit is abnormal.
The protection signal generated based on the triggering of the hall current sensor and the protection signal generated based on the triggering of the sampling resistor have the same priority, any abnormal circuit triggers the driving protection module, and the overcurrent reason may be that the circuit is interfered by electromagnetism or surge to cause the control module to crash and reset, or the reactor is in short circuit abnormality, and the like.
In any one of the above technical solutions, optionally, the method further includes: and the bus capacitor is connected to the direct current output end of the power factor correction module and is arranged in parallel with the load driving module.
In any of the above technical solutions, optionally, the control module is further configured to: if the input voltage of the alternating current power supply is in a positive half cycle, controlling the switch driving module to output a switch signal for conducting the first switch tube and the fourth switch tube and bypassing the corresponding freewheeling diode; the control module is further configured to: and if the input voltage of the alternating current power supply is in a negative half cycle, controlling the switch driving module to output a switch signal for conducting the second switch tube and the third switch tube, and bypassing the corresponding freewheeling diode to realize synchronous rectification.
The first switching tube has a freewheeling diode inside, the freewheeling diode is a part of a PN junction existing between a source and a drain of the first switching tube, and a saturation voltage (drain-source voltage in an on state) of the first switching tube is lower than a forward voltage drop of the freewheeling diode. Accordingly, the voltage drop is smaller when a current flows through the source and drain of the first switching tube than when a current flows through the parasitic diode, and the conduction loss can be reduced. It is easy to understand that the flow of current through the first switching tube in the on state reduces conduction loss as compared with the flow of current through the freewheeling diode in the first switching tube in the off state, and the present invention is also applicable to other second, third, and fourth switching tubes.
In the technical scheme, the low-power-consumption synchronous rectification can be realized by utilizing the principle of low conduction voltage drop of the MOS tube and turning on the corresponding MOS tube according to the phase state of the alternating current.
Specifically, the control module outputs a corresponding control signal according to the current alternating current phase detected by the zero-crossing detection module to drive a corresponding switching tube to work.
In the related art, when synchronous rectification is performed, when an alternating current power supply is in a positive half cycle, current passes through a hall current sensor and a reactor, and then is rectified by a freewheeling diode of a fourth switching tube through a first switching tube to supply power to a system, and at the moment, because the freewheeling diode has a large voltage drop, energy waste is caused.
In the technical scheme, at the moment, the control module judges that the current passes through the Hall current sensor and the reactor when the positive half cycle of the alternating current power supply starts according to the zero-crossing detection module, and outputs a switching signal to drive the first switching tube and the fourth switching tube to be conducted, so that the current flowing through the freewheeling diode on the first switching tube and the fourth switching tube of the sampling resistor flows through the MOS tube, and the freewheeling diode is bypassed by utilizing the low conduction characteristic of the MOS tube, thereby reducing the conduction loss. Similarly, when the alternating current power supply is in a negative half cycle, the control module controls the second switching tube and the third switching tube to be switched on, so that the four MOS tubes realize a synchronous rectification function, and in the synchronous rectification process, whether an overcurrent phenomenon occurs is detected by detecting currents passing through the Hall current sensor and the sampling resistor.
In any of the above technical solutions, optionally, the control module is further configured to: if the input voltage of the alternating current power supply is in a positive half cycle, controlling the third switching tube and the fourth switching tube to be opened and closed according to the zero-crossing detection signal and the switching signal, enabling the third switching tube and the fourth switching tube to be conducted to charge the reactor, turning off the third switching tube and the fourth switching tube, enabling the first switching tube to be conducted, and enabling the reactor to supply power to a load; the control module is further configured to: if the input voltage of the alternating current power supply is in a negative half cycle, controlling the third switching tube and the fourth switching tube to be opened and closed according to the zero-crossing detection signal and the switching signal, enabling the third switching tube and the fourth switching tube to be conducted to charge the reactor, turning off the third switching tube and the fourth switching tube to drive the second switching tube to be conducted, and enabling the reactor to supply power to a load to achieve power factor correction.
In the technical scheme, when the circuit is used for PFC operation, when the input is in the positive half cycle of an alternating current power supply, the control module drives the third switching tube and the fourth switching tube to be conducted according to a zero-crossing detection signal to charge the reactor, during the charging process, whether a short-circuit phenomenon occurs or not is determined by detecting the current on the Hall current sensor, when the third switching tube and the fourth switching tube are turned off, the control module drives the first switching tube to be conducted, the electric energy stored by the reactor is released to a rear-stage circuit through the first switching tube to supply power to a bus capacitor and a load (such as a motor), when the input is in the negative half cycle of the alternating current power supply, the control module drives the third switching tube and the fourth switching tube to be conducted according to the zero-crossing detection signal to charge the reactor, and when the third switching tube and the fourth switching tube are turned off, the control module drives the second switching tube to be opened, the electric energy stored by the reactor is released to a later-stage circuit through the second switch tube to supply power to the bus capacitor and a load (such as a motor), the energy accumulated in the reactor is released to the bus capacitor, and the direct-current voltage of the bus capacitor is boosted, so that the distortion of a current waveform can be reduced through short-circuit current, the current waveform is close to a sine wave, the power factor of the PFC circuit can be further improved, further, the pulse width of the third switch tube or the first switch tube is calculated according to the bus voltage of the load, the duration of the short-circuit current in the PFC circuit can be reasonably adjusted, the conducting/turning-off times of each switch are reasonably controlled according to the pulse change times, the conducting loss of a switch unit can be reduced, the switching loss is reduced, and the efficiency is improved.
In any one of the above technical solutions, optionally, the method further includes: and one end of the bus capacitor is connected to the positive output end, the other end of the bus capacitor is grounded, the switch driving module outputs the switching signal, the bus capacitor is charged through the alternating current power supply, or the bus capacitor discharges, the switch driving module does not output the switching signal, and the bus capacitor discharges.
In any one of the above technical solutions, optionally, the method further includes: the load driving module is connected to the direct current output end of the power factor correction module and used for receiving the direct current output of the power factor correction module so as to supply power to a load; and the direct current bus voltage detection module is connected to the direct current output end of the power factor correction module, is arranged in parallel with the load driving module and is used for detecting the direct current bus voltage.
In the technical scheme, in an application scenario that a load is a motor, a load driving module is used for inverting a voltage-stabilized direct current into a three-phase alternating current output so as to supply power to the motor, and the switching states of all switching tubes in a power factor correction module and the pulse widths of all switching tubes when the switching tubes are conducted are controlled by detecting the bus voltage of the direct current output of the power factor correction module and the input voltage in combination with the setting of a direct current bus voltage detection module.
In any one of the above technical solutions, optionally, the control module is further connected to a load driving module for outputting an inversion control signal to the load driving module.
According to an embodiment of the second aspect of the present invention, there is provided an air conditioner, including: the power factor correction circuit according to the first aspect of the present invention.
Specifically, the power factor correction circuit is applied to a motor driving system of a compressor, and the phenomenon of demagnetization of the compressor caused by over-high rotating speed of a motor during over-current is prevented by detecting whether the over-current phenomenon occurs in a circuit.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, 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 power factor correction circuit in the related art;
fig. 2 shows a schematic diagram of a power factor correction circuit according to an embodiment of the 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.
Example one
As shown in fig. 2, a power factor correction circuit according to an embodiment of the present invention is suitable for an air conditioner, including: a power factor correction module 10 receiving a power supply signal, wherein the power factor correction module 10 includes a switch tube configured to control the power supply signal to supply power to a load; the switch driving module is connected to a driving input end of the power factor correction module 10, and is used for outputting a switching signal to the power factor correction module 10; the control module 30 is connected to the switch driving module and is used for controlling the switch driving module to turn on and output the switch signal or turn off and output the switch signal; a hall current sensor 40 disposed at an ac input side of the power factor correction module 10 to collect an input current and determine the input current as a sampling signal; and the driving protection module 50 is connected with the hall current sensor 40 and the control module 30, and outputs a protection signal to the control module 30 if the sampling signal is greater than a first safety threshold, wherein the protection signal is used for triggering the control module 30 to close the output of the switch driving module.
In this embodiment, a hall current sensor 40 is disposed at the ac input end of the pfc module 10, the hall current sensor 40 collects the input current or the output current of the pfc module 10 based on the disposed position, and converts the current into a sampling signal to be output to the driving protection module 50, so as to detect whether the overcurrent phenomenon occurs by the driving protection module 50, and to control to stop outputting the switching signal to the pfc module 10 when the overcurrent phenomenon is detected, on one hand, since the hall current sensor 40 is not in electrical contact with the circuit to be detected, the power of the power source to be detected can not be consumed, the high-efficiency and low-power control of the inverter device is not affected, on the other hand, since the hall current sensor 40 directly collects the input end current of the pfc module 10, and the input end is connected to the live wire and zero wire end N of the ac power source, therefore, whether the rectifier is abnormal or not can be detected more directly, corresponding abnormal parts can be determined under different working conditions when the abnormity is determined, and compared with the scheme that the driving chip with the protection function is combined with the sampling resistor Rs to perform overcurrent detection in the prior art, the overcurrent detection device is smaller in limitation and has pertinence and practicability.
The hall current sensor 40 is a sensor that converts a primary large current into a secondary micro sampling signal by using a hall effect, and combines with an operational amplifier to amplify the micro sampling signal into a standard voltage, that is, the hall current sensor 40 outputs the sampling signal to the outside, and compares the sampling signal with a safety threshold value built in the driving protection module 50, and determines whether a short circuit overcurrent phenomenon occurs in a circuit according to a comparison result, because the hall current sensor 40 can measure both ac and dc, the hall current sensor can be arranged on an ac input side of the power factor correction module 10, and can also be arranged on a dc output side of the power factor correction module 10.
Example two
As shown in fig. 2, on the basis of providing the hall current sensor 40, in the above embodiment, optionally, the method further includes: and the sampling resistor Rs is arranged at the negative electrode output end of the power factor correction module 10 and is connected to the driving protection module 50, and the driving protection module 50 outputs the protection signal to the control module 30 when detecting that the voltage drop of the sampling resistor Rs exceeds a second safety threshold.
In this embodiment, a hall current sensor 40 is connected in series to the ac side of the pfc module 10 to detect the current on the ac side, and then a sampling signal output by the sensor is used as an input signal for driving the protection module 50, and is combined with a sampling resistor Rs connected in series to the negative output terminal of the pfc module 10, and a voltage detected by the sampling resistor Rs is also input to the driving protection module 50, so that when any one of the two input voltages exceeds a preset voltage of the current detection and driving protection module 50, the protection of the current detection and driving protection module 50 is triggered and the pfc module 10 is turned off.
In any one of the above embodiments, optionally, the method further includes: a reactor L1 provided between the power factor correction module 10 and an ac power supply; the zero-crossing detection module 60 is arranged between a live wire end L and a zero line end N of the alternating-current power supply and is connected to the control module 30, and the zero-crossing detection module 60 is used for acquiring a zero-crossing detection signal between the live wire end L and the zero line end N; the control module 30 is further configured to: the phase state of the ac power supply is determined according to the zero-crossing detection signal output by the zero-crossing detection module 60, and a switch control signal is output to the switch driving module according to the phase state to control the charging of the reactor L1.
By providing the reactor L1 between the ac input terminal of the power factor correction module 10 and the ac power supply in this embodiment, the reactor L1 can convert the electric energy supplied from the ac power supply into magnetic energy to be stored as energy when the ac power supply performs ac output, and can achieve boosting of the PFC circuit and improvement of the power factor by discharging the energy.
Specifically, the zero-cross detection module 60 is disposed between the live line and the zero line, so that the zero-cross detection module 60 determines the real-time phase of the ac power supply, so as to drive different switching devices in the power factor correction module 10 to perform switching operations according to different phase states, so as to respectively implement a rectification function or a Power Factor Correction (PFC) function, thereby implementing dc power supply at a load end based on the rectification function, or making the ac-side voltage and the ac-side current consistent in phase through PFC control.
In addition, the overcurrent phenomenon may occur due to various reasons, such as a dead reset of the control module 30 caused by a disturbance to the circuit, or a short-circuit abnormality of the reactor L1.
EXAMPLE III
In any of the above embodiments, as shown in fig. 2, optionally, the power factor correction module 10 is formed by configuring a first switch tube Q1, a second switch tube Q2, a third switch tube Q3 and a fourth switch tube Q4, the first switch tube Q1 and the second switch tube Q2 are arranged on the upper portion of the power factor correction module 10, the third switch tube Q3 and the fourth switch tube Q4 are arranged on the lower portion of the power factor correction module 10, the first switch tube Q1 and the third switch tube Q3 are arranged on the left portion of the power factor correction module 10, the second switch tube Q2 and the fourth switch tube Q4 are arranged on the right portion of the power factor correction module 10, a freewheeling diode is connected in parallel in reverse direction to the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4, the connection point of the drain of the first switch tube Q1 and the drain of the second switch tube Q2 is connected in series, and determines the positive output terminal of the power factor correction module, the source electrode of the third switching tube Q3 is connected with the source electrode of the fourth switching tube Q4 in series, the connecting point is connected with the sampling resistor Rs in series and then grounded, the source electrode of the first switching tube Q1 is connected with the drain electrode of the third switching tube Q3 in series, the connecting point is connected to the live wire end L, the source electrode of the second switching tube Q2 is connected with the drain electrode of the fourth switching tube Q4 in series, and the connecting point is connected to the neutral wire end N.
Specifically, the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 may be mosfets (metal oxide semiconductor field effect transistors, MOS transistors), such as super-junction mosfets or SiC-mosfets.
The MOS tube works in a mode that the grid electrode controls the on-off between the source electrode and the drain electrode to realize the switch, and the grid electrode power supply is required to be larger than the source electrode power supply when the MOS tube is switched on.
In this embodiment, the power factor correction module 10 composed of four switching tubes is provided, and in combination with a control command output by the control module 30, the control circuit performs a rectifying operation or a power factor correction operation, respectively, and when the power factor correction module is used as a component of a motor drive system, the control circuit performs a boosting operation by alternately performing a "power factor improvement operation" and a "synchronous rectifying operation" to achieve the purpose of increasing the allowable limit of the motor rotation speed, and in the working process, a current transformer and a hall current sensor are additionally provided in the circuit to detect the operating current, and in the case of detecting the occurrence of a current abnormality, the power factor correction module 10 is controlled to stop working, and is operated again after the abnormality is eliminated, thereby ensuring the safety of the motor drive process.
In this embodiment, by providing the hall current sensor 40 at the ac input terminal of the power factor correction module 10, no matter whether the rectifying operation or the power factor correction operation is performed, current flows through the hall current sensor 40, so that when current is detected to flow through the hall device, the device will output a corresponding voltage, according to the current value that can be borne by the four switching tubes of the power factor correction module 10, a voltage value to be protected is set in the driving protection module 50 or an overcurrent detection unit built in the hall current sensor 40, the first switching tube Q1 is connected in series between the live wire and the neutral wire in the second switching tube Q2, the third switching tube Q3 is connected in series between the live wire and the neutral wire in the fourth switching tube Q4, and when abnormal overcurrent occurs in the first switching tube Q1-the second switching tube Q2, or in the third switching tube Q3-the fourth switching tube Q4, the current will output a corresponding voltage through the hall current sensor 40 and trigger the driving protection module 50, and then the switching signal of the switch driving module is turned off, thereby protecting and realizing the overcurrent of the switching tube, when the overcurrent signal is removed, the drive protection module 50 removes the control of the overcurrent switch driving module to recover the normal work, thereby realizing the timely and effective detection of the fault with higher probability in the rectifying operation process or the power factor correction process, and achieving the purpose of improving the safety of the whole PFC circuit.
For the power factor correction circuit of the hall current sensor 40 and the sampling resistor Rs, the voltage can be sampled based on the hall current sensor 40 and/or the sampling resistor Rs in different current flow paths, and whether the short circuit phenomenon exists is determined according to the detection result of the sampled voltage, so that the detection requirements of different combined flow paths of the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 in the power factor correction module 10 can be met.
In any of the above embodiments, optionally, the switch driving module includes a first switch driving module 202 configured to drive the first switch Q1 and the third switch Q3, and a second switch driving module 204 configured to drive the second switch Q2 and the fourth switch Q4, wherein if the driving protection module 50 detects that the sampling signal is greater than a first safety threshold and/or the voltage drop is greater than a second safety threshold, the driving protection module triggers the control module 30 to turn off the driving outputs of the first switch driving module 202 and the second switch driving module 204.
In this embodiment, the switch driving module includes a first switch driving module 202 and a second switch driving module 204 to implement half-bridge driving of the H-bridge rectifier.
In addition, as can be understood by those skilled in the art, in order to simultaneously control the first switch driving module 202 and the second switch driving module 204 to stop outputting when the control module 30 controls the switch driving modules to stop driving outputting, the two switch driving modules have the same execution priority.
In any one of the above embodiments, optionally, the method further includes: and a bus capacitor E connected to the dc output terminal of the power factor correction module 10 and arranged in parallel with the load driving module 70.
Example four
As shown in fig. 2, in any of the above embodiments, optionally, the hall current sensor 40 is provided between the alternating-current power supply and the reactor L1; the drive protection module 50 is further configured to: if it is detected that the sampling signal is greater than the first safety threshold, the protection signal is output to the control module 30 to close the output of the switch driving module.
The hall current sensor 40 can be placed at any position of the live line or the neutral line in series with the reactor L1.
In this embodiment, by providing the hall current sensor 40 at the ac input terminal of the power factor correction module 10, no matter whether the rectifying operation or the power factor correction operation is performed, current flows through the hall current sensor 40, so that when current is detected to flow through the hall device, the device will output a corresponding voltage, according to the current value that can be borne by the four switching tubes of the power factor correction module 10, a voltage value to be protected is set in the driving protection module 50 or the overcurrent detection unit built in the hall current sensor 40, the first switching tube Q1 is connected in series between the live wire and the neutral wire in the second switching tube Q2, the third switching tube Q3 is connected in series between the live wire and the fourth switching tube Q4, when abnormal overcurrent occurs in the first switching tube Q1-the second switching tube Q2 or the third switching tube Q3-the fourth switching tube Q4, the current will output a corresponding voltage through the hall current sensor 40 and trigger the driving protection module 50, and then the switching signal of the switch driving module is turned off, thereby protecting and realizing the overcurrent of the switching tube, when the overcurrent signal is removed, the drive protection module 50 removes the control of the overcurrent switch driving module to recover the normal work, thereby realizing the timely and effective detection of the fault with higher probability in the rectifying operation process or the power factor correction process, and achieving the purpose of improving the safety of the whole PFC circuit.
For the power factor correction circuit of the hall current sensor 40 and the sampling resistor Rs, the voltage can be sampled based on the hall current sensor 40 and/or the sampling resistor Rs in different current flow paths, and whether the short circuit phenomenon exists is determined according to the detection result of the sampled voltage, so that the detection requirements of different combined flow paths of the first switch tube Q1, the second switch tube Q2, the third switch tube Q3 and the fourth switch tube Q4 in the power factor correction module 10 can be met.
The first switch tube Q1 and the third switch tube Q3 are driven by the first switch driving module 202, the second switch tube Q2 and the fourth switch tube Q4 are driven by the second switch driving module 204, the sampling signal output by the hall current sensor 40 and the voltage sampling signal of the sampling resistor Rs are both connected to the driving protection module 50, and when the driving protection module 50 detects that the voltage output by the hall current sensor 40 and the voltage sampling signal on the sampling resistor Rs exceed preset values, the first switch driving module 202 and the second switch driving module 204 are forcibly turned off, so that four switch tubes are protected.
The hall current sensor 40 is mainly used for detecting when a current passes through the first switch tube Q1 and the second switch tube Q2 in sequence, or when the current passes through the third switch tube Q3 and the fourth switch tube Q4 in sequence, the short circuit is abnormal, and the sampling resistor Rs is mainly used for detecting when the current passes through the first switch tube Q1 and the third switch tube Q3 in sequence, or when the current passes through the second switch tube Q2 and the fourth switch tube Q4 in sequence, the short circuit is abnormal.
As can be understood by those skilled in the art, the priority of the protection signal generated based on the triggering of the hall current sensor 40 is the same as the priority of the protection signal generated based on the triggering of the sampling resistor Rs, any abnormal condition occurs in any path and triggers the driving protection module 50, and the overcurrent reason may be that the circuit is subjected to electromagnetic or surge interference, so that the control module 30 is halted and reset, or the short circuit abnormality occurs in the reactor L1, and so on.
EXAMPLE five
In any of the above embodiments, optionally, the control module 30 is further configured to: if the input voltage of the alternating current power supply is in a positive half cycle, controlling the switch driving module to output a switch signal for enabling the first switch tube Q1 and the fourth switch tube Q4 to be conducted, and bypassing a corresponding freewheeling diode; the control module 30 is further configured to: if the input voltage of the alternating current power supply is in a negative half cycle, the switch driving module is controlled to output a switching signal for conducting the second switching tube Q2 and the third switching tube Q3, and corresponding freewheeling diodes are bypassed, so that synchronous rectification is realized.
The first switching tube Q1 has a freewheeling diode therein, the freewheeling diode is a part of a P-junction existing between the source and the drain of the first switching tube Q1, and the saturation voltage (drain-source voltage in the on state) of the first switching tube Q1 is lower than the forward voltage drop of the freewheeling diode. Accordingly, the voltage drop of the current flowing through the source/drain of the first switching tube Q1 is smaller than that of the current flowing through the parasitic diode, and the conduction loss can be reduced. It is easy to understand that the flow of current through the first switching transistor Q1 in the on state reduces conduction loss as compared with the flow of current through the freewheeling diode in the first switching transistor Q1 in the off state, and that the present invention is also applicable to the other second switching transistor Q2, third switching transistor Q3, and fourth switching transistor Q4.
In the embodiment, by utilizing the principle of low conduction voltage drop of the MOS tube, the low-power-consumption synchronous rectification can be realized by turning on the corresponding MOS tube according to the phase state of the alternating current.
Specifically, the control module 30 outputs a corresponding control signal according to the current ac phase detected by the zero-crossing detection module 60 to drive the corresponding switching tube to operate.
In the related art, during synchronous rectification, when the ac power supply is in the positive half cycle, the current passes through the hall current sensor 40 and the reactor L1, and then is rectified by the freewheeling diode of the first switching tube Q1 and the fourth switching tube Q4 to supply power to the system.
In this embodiment, at this time, the control module 30 determines, according to the zero-cross detection module 60, that at the beginning of the positive half cycle of the ac power supply, the current passes through the hall current sensor 40 and the reactor L1, outputs a switching signal to drive the first switching tube Q1 and the fourth switching tube Q4 to be conducted, so that the current flowing through the freewheeling diode on the first switching tube Q1, the sampling resistor Rs and the fourth switching tube Q4 flows through the MOS transistor, and the freewheeling diode is bypassed by using the low conduction characteristic of the MOS transistor, thereby reducing the conduction loss. Similarly, when the alternating current power supply is in the negative half cycle, the control module 30 controls to turn on the second switching tube Q2 and the third switching tube Q3, so that the four MOS tubes realize the synchronous rectification function, and in the synchronous rectification process, whether the overcurrent phenomenon occurs is detected by detecting the current passing through the hall current sensor 40 and the sampling resistor Rs.
EXAMPLE six
In any of the above embodiments, optionally, the control module 30 is further configured to: if the input voltage of the alternating current power supply is in a positive half cycle, controlling the third switching tube Q3 and the fourth switching tube Q4 to be opened and closed according to the zero-crossing detection signal and the switching signal, enabling the third switching tube Q3 and the fourth switching tube Q4 to be conducted so as to charge the reactor L1, enabling the third switching tube Q3 and the fourth switching tube Q4 to be turned off, enabling the first switching tube Q1 to be conducted, and enabling the reactor L1 to supply power to a load; the control module 30 is further configured to: if the input voltage of the alternating current power supply is in a negative half cycle, the third switching tube Q3 and the fourth switching tube Q4 are controlled to be opened and closed according to the zero-crossing detection signal and the switching signal, the third switching tube Q3 and the fourth switching tube Q4 are switched on to charge the reactor L1, the third switching tube Q3 and the fourth switching tube Q4 are switched off to drive the second switching tube Q2 to be switched on, and the reactor L1 supplies power to a load to realize power factor correction.
In this embodiment, when the circuit is used for PFC operation, the control module 30 drives the third switching tube Q3 and the fourth switching tube Q4 to conduct and charge the reactor L1 according to the zero-crossing detection signal when the input is in the positive half cycle of the ac power supply, when the third switching tube Q3 and the fourth switching tube Q4 are turned off, the control module 30 drives the first switching tube Q1 to open, the electric energy stored in the reactor L1 is released to the rear stage circuit through the first switching tube Q1 to supply power to the bus capacitor E and the load (such as a motor), when the input is in the negative half cycle of the ac power supply, the control module 30 drives the third switching tube Q3 and the fourth switching tube Q4 to conduct and charge the reactor L1 according to the zero-crossing detection signal, when the third switching tube Q3 and the fourth switching tube Q4 are turned off, the control module 30 drives the second switching tube Q2 to open and the electric energy stored in the reactor L1 is released to the rear stage circuit through the second switching tube Q2, the method comprises the steps of supplying power to a bus capacitor E and a load (such as a motor), releasing energy accumulated in a reactor L1 to the bus capacitor E, boosting direct-current voltage of the bus capacitor E, reducing distortion of a current waveform through short-circuit current, enabling the current waveform to be close to a sine wave, and further improving the power factor of a PFC circuit, further, calculating the pulse width of a third switching tube Q3 or a first switching tube Q1 according to the bus voltage of the load, reasonably adjusting the duration of the short-circuit current in the PFC circuit, reasonably controlling the on/off times of each switch according to the pulse change times, reducing the on loss of a switch unit, reducing the switch loss and improving the efficiency.
In any one of the above embodiments, optionally, the method further includes: and one end of the bus capacitor E is connected to the positive output end, the other end of the bus capacitor E is grounded, the switch driving module outputs the switching signal, the bus capacitor E is charged through the alternating current power supply, or the bus capacitor E discharges, the switch driving module does not output the switching signal, and the bus capacitor E discharges.
In any one of the above embodiments, optionally, the method further includes: a load driving module 70 connected to the dc output terminal of the power factor correction module 10, for receiving the dc output of the power factor correction module 10 to supply power to a load; a dc bus voltage detection module (not shown in the figure) connected to the dc output terminal of the power factor correction module 10, and arranged in parallel with the load driving module 70, for detecting the dc bus voltage.
In this embodiment, in an application scenario where the load is a motor, the load driving module 70 is configured to invert a regulated dc to a three-phase ac output to supply power to the motor, and in combination with the setting of the dc bus voltage detection module, the switching state of each switching element in the power factor correction module 10 and the pulse width when each switching element is turned on are controlled by detecting the bus voltage of the dc output of the power factor correction module 10 and detecting the input voltage.
In any of the above embodiments, optionally, the control module 30 is further connected to a load driving module 70 for outputting an inversion control signal to the load driving module 70.
According to the utility model discloses an air conditioner, include: the power factor correction circuit of any of the above embodiments.
Specifically, the power factor correction circuit is applied to a motor driving system of a compressor, and the phenomenon of demagnetization of the compressor caused by over-high rotating speed of a motor during over-current is prevented by detecting whether the over-current phenomenon occurs in a circuit.
Compared with the prior art, the embodiment disclosed in the technical scheme of the application has at least the following beneficial effects:
(1) because the input current of the power factor correction module is directly collected by the Hall current sensor, different current flow paths corresponding to the power factor correction module when different functional operations are executed can be subjected to circuit abnormity detection through the Hall current sensor, so that whether the rectifier is abnormal can be more directly detected, and when the abnormity is determined, corresponding abnormal parts can be determined under different working conditions.
(2) When any one of the two paths of input voltages exceeds the preset voltage of the current detection and drive protection module, the protection of the current detection and drive protection module is triggered and the power factor correction module is switched off, so that the function of detecting the overcurrent phenomenon can be realized on the input and output sides.
(3) For the power factor correction circuit of the Hall current sensor and the sampling resistor, the voltage can be sampled based on the Hall current sensor and/or the sampling resistor in different current flow paths, and whether a short circuit phenomenon exists or not is determined according to the detection result of the sampling voltage, so that the detection requirements of different combination flow paths of a first switch tube, a second switch tube, a third switch tube and a fourth switch tube in the power factor correction module can be met.
Above combine the figure to explain in detail the technical scheme of the utility model, through the hall current sensor of establishing ties in power factor correction module's interchange side for be responsible for the electric current of detecting the interchange side, then regard the sampling signal of this sensor output as the input signal of drive protection module, combine the sampling resistor who establishes ties at power factor correction module's negative pole output, the drive protection module is also input to the voltage that this sampling resistor detected, when any one of these two tunnel input voltage surpassed the predetermined voltage of current detection and drive protection module, all will trigger current detection and drive protection module's protection and turn-off power factor correction module.
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 processor 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 processor 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 modular claim 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.
Obviously, various modifications and changes may be made by those skilled in the art without departing from the scope of the present invention and its equivalents, and it is intended that the present invention also include such modifications and changes.
Claims (11)
1. A power factor correction circuit, comprising:
the power factor correction module receives a power supply signal and comprises a switch tube which is configured to control the power supply signal to supply power to a load;
the switch driving module is connected to the driving input end of the power factor correction module and used for outputting a switch signal to the power factor correction module;
the control module is connected to the switch driving module and used for controlling the switch driving module to be switched on and output the switch signal or switched off and output the switch signal;
the current sensor is arranged on the input side of the power factor correction module to collect input current and determine the input current as a sampling signal;
the drive protection module is connected with the current sensor and the control module, if the sampling signal is greater than a first safety threshold value, the sampling signal outputs a protection signal to the control module, and the protection signal is used for triggering the control module to close the output of the switch drive module.
2. The power factor correction circuit of claim 1, further comprising:
and the sampling resistor is arranged at the negative electrode output end of the power factor correction module and is connected to the driving protection module, and the driving protection module outputs the protection signal to the control module when detecting that the voltage drop on the sampling resistor exceeds a second safety threshold.
3. The power factor correction circuit of claim 2, further comprising:
the reactor is arranged between the power factor correction module and an alternating current power supply;
the zero-crossing detection module is arranged between a live wire end and a zero line end of the alternating current power supply and is connected to the control module, and the zero-crossing detection module is used for acquiring a zero-crossing detection signal between the live wire end and the zero line end;
the control module is further configured to: determining a phase state of the AC power according to a zero-crossing detection signal output by the zero-crossing detection module, and outputting a switch control signal to the switch driving module according to the phase state to control charging of the reactor,
the alternating current power supply is used for outputting the power supply signal.
4. The power factor correction circuit of claim 3,
the current sensor is provided between the alternating-current power supply and the reactor;
the drive protection module is further configured to: and if the sampling signal is detected to be larger than a first safety threshold value, outputting the protection signal to the control module to close the output of the switch driving module.
5. The power factor correction circuit of claim 4,
the power factor correction module is formed by a first switching tube, a second switching tube, a third switching tube and a fourth switching tube, the first switch tube, the second switch tube, the third switch tube and the fourth switch tube are reversely connected with a freewheeling diode in parallel, the drain electrode of the first switch tube is connected with the drain electrode of the second switch tube in series, and the connection point is determined as the positive output end of the power factor correction module, the source electrode of the third switching tube is connected with the source electrode of the fourth switching tube in series, the connection point is determined as the negative output end, the source electrode of the first switching tube is connected with the drain electrode of the third switching tube in series after being connected with the sampling resistor in series and then grounded, and connecting the connection point to the live wire end, connecting the source electrode of the second switching tube with the drain electrode of the fourth switching tube in series, and connecting the connection point to the zero wire end.
6. The power factor correction circuit of claim 5,
the switch driving module comprises a first switch driving module for driving the first switch tube and the third switch tube, and a second switch driving module for driving the second switch tube and the fourth switch tube,
if the drive protection module detects that the sampling signal is greater than a first safety threshold and/or the voltage drop is greater than a second safety threshold, the control module is triggered to close the drive outputs of the first switch drive module and the second switch drive module.
7. The power factor correction circuit of claim 5,
the control module is further configured to: if the input voltage of the alternating current power supply is in a positive half cycle, controlling the switch driving module to output a switch signal for conducting the first switch tube and the fourth switch tube and bypassing the corresponding freewheeling diode;
the control module is further configured to: and if the input voltage of the alternating current power supply is in a negative half cycle, controlling the switch driving module to output a switch signal for conducting the second switch tube and the third switch tube, and bypassing the corresponding freewheeling diode to realize synchronous rectification.
8. The power factor correction circuit of claim 5,
the control module is further configured to: if the input voltage of the alternating current power supply is in a positive half cycle, controlling the third switching tube and the fourth switching tube to be opened and closed according to the zero-crossing detection signal and the switching signal, enabling the third switching tube and the fourth switching tube to be conducted to charge the reactor, turning off the third switching tube and the fourth switching tube, enabling the first switching tube to be conducted, and enabling the reactor to supply power to a load;
the control module is further configured to: if the input voltage of the alternating current power supply is in a negative half cycle, controlling the third switching tube and the fourth switching tube to be opened and closed according to the zero-crossing detection signal and the switching signal, enabling the third switching tube and the fourth switching tube to be conducted to charge the reactor, turning off the third switching tube and the fourth switching tube to drive the second switching tube to be conducted, and enabling the reactor to supply power to a load to achieve power factor correction.
9. The power factor correction circuit of claim 5, further comprising:
and one end of the bus capacitor is connected to the positive output end, the other end of the bus capacitor is grounded, the switch driving module outputs the switching signal, the bus capacitor is charged through the alternating current power supply, or the bus capacitor discharges, the switch driving module does not output the switching signal, and the bus capacitor discharges.
10. The power factor correction circuit according to any one of claims 1 to 8, further comprising:
the load driving module is connected to the direct current output end of the power factor correction module and used for receiving the direct current output of the power factor correction module so as to supply power to a load;
the control module is also connected to the load driving module for outputting an inversion control signal to the load driving module.
11. An air conditioner, comprising: a power factor correction circuit as claimed in any one of claims 1 to 10.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920710867.4U CN209860795U (en) | 2019-05-17 | 2019-05-17 | Power factor correction circuit and air conditioner |
| PCT/CN2019/117017 WO2020232995A1 (en) | 2019-05-17 | 2019-11-11 | Power factor correction circuit and air conditioner |
| JP2021568807A JP2022534367A (en) | 2019-05-17 | 2019-11-11 | Power factor correction circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920710867.4U CN209860795U (en) | 2019-05-17 | 2019-05-17 | Power factor correction circuit and air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209860795U true CN209860795U (en) | 2019-12-27 |
Family
ID=68941287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920710867.4U Active CN209860795U (en) | 2019-05-17 | 2019-05-17 | Power factor correction circuit and air conditioner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209860795U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980915A (en) * | 2019-05-17 | 2019-07-05 | 广东美的制冷设备有限公司 | Circuit of power factor correction and air conditioner |
| CN113972822A (en) * | 2020-07-22 | 2022-01-25 | 广东美的制冷设备有限公司 | Power factor correction circuit and control method thereof, medium, compressor and air conditioner |
| CN114050549A (en) * | 2022-01-11 | 2022-02-15 | 华邦创科(惠州市)智能科技有限公司 | Single-phase power supply quick circuit-breaking protection system |
| CN117081366A (en) * | 2023-10-13 | 2023-11-17 | 深圳莱福德科技股份有限公司 | Lighting drive start-up delay circuit |
-
2019
- 2019-05-17 CN CN201920710867.4U patent/CN209860795U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980915A (en) * | 2019-05-17 | 2019-07-05 | 广东美的制冷设备有限公司 | Circuit of power factor correction and air conditioner |
| CN113972822A (en) * | 2020-07-22 | 2022-01-25 | 广东美的制冷设备有限公司 | Power factor correction circuit and control method thereof, medium, compressor and air conditioner |
| CN113972822B (en) * | 2020-07-22 | 2024-01-16 | 广东美的制冷设备有限公司 | Power factor correction circuit, control method thereof, medium, compressor and air conditioner |
| CN114050549A (en) * | 2022-01-11 | 2022-02-15 | 华邦创科(惠州市)智能科技有限公司 | Single-phase power supply quick circuit-breaking protection system |
| CN117081366A (en) * | 2023-10-13 | 2023-11-17 | 深圳莱福德科技股份有限公司 | Lighting drive start-up delay circuit |
| CN117081366B (en) * | 2023-10-13 | 2024-02-23 | 深圳莱福德科技股份有限公司 | Lighting drive start-up delay circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN209860795U (en) | Power factor correction circuit and air conditioner | |
| JP7374226B2 (en) | Power factor correction circuit and air conditioner | |
| CN109874379B (en) | Power conversion device and air conditioner | |
| US8467212B2 (en) | Rectifier circuit | |
| JP6284081B2 (en) | Inverter device | |
| US9531250B2 (en) | Power conversion device and refrigeration/air-conditioning system | |
| JP5258927B2 (en) | Power converter, refrigeration air conditioning system, and control method | |
| CN110011530A (en) | Circuit of power factor correction and air conditioner | |
| CN110011531A (en) | Circuit of power factor correction and air conditioner | |
| CN209545434U (en) | Circuit of power factor correction and air conditioner | |
| WO2020232995A1 (en) | Power factor correction circuit and air conditioner | |
| CN109980915A (en) | Circuit of power factor correction and air conditioner | |
| US11909197B2 (en) | Motor drive device, blower, compressor, and air conditioner | |
| CN210007620U (en) | Power factor correction circuit and air conditioner | |
| CN109980914A (en) | Circuit of power factor correction and air conditioner | |
| CN110034671A (en) | Circuit of power factor correction and air conditioner | |
| CN209860796U (en) | Power factor correction circuit and air conditioner | |
| US10734900B2 (en) | Converter device, motor drive device, refrigerator, air conditioner, and heat-pump water heater | |
| CN210007619U (en) | Power factor correction circuit and air conditioner | |
| US11811353B2 (en) | Load driving device, refrigeration cycle applicable apparatus, and air conditioner | |
| WO2020232994A1 (en) | Power factor correction circuit and air conditioner | |
| CN114337465A (en) | Intelligent control module and control method thereof | |
| KR101946369B1 (en) | Power transforming apparatus and air conditioner including the same | |
| JP5716682B2 (en) | DC power supply | |
| Ishigaya et al. | High-efficiency converter technologies for advanced air conditioner |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |