CN214380652U - PFC drive circuit, circuit board and air conditioner - Google Patents
PFC drive circuit, circuit board and air conditioner Download PDFInfo
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- CN214380652U CN214380652U CN202120500463.XU CN202120500463U CN214380652U CN 214380652 U CN214380652 U CN 214380652U CN 202120500463 U CN202120500463 U CN 202120500463U CN 214380652 U CN214380652 U CN 214380652U
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The utility model discloses a PFC drive circuit, circuit board and air conditioner, wherein, PFC drive circuit includes power loop and control loop, and the switch tube includes first pin, second pin and control pin in the power loop, and the positive pole of rectification module is connected to first pin, and the negative pole of second pin and rectification module all is connected to simulation ground; the control loop comprises a driving module, a signal output pin of the driving module is connected with a control pin to control the on-off of the switch tube, the switch tube further comprises a third pin, the third pin and a grounding pin of the driving module are both connected to a digital ground, and the third pin is electrically connected with the second pin in the switch tube; the utility model discloses a power loop and control loop among the separation PFC drive circuit avoid the high frequency current among the power loop to control loop's influence, therefore the switch tube can respond drive module's control signal sooner, realizes the switch of higher frequency.
Description
Technical Field
The utility model relates to an electronic circuit technical field especially relates to a PFC drive circuit, circuit board and air conditioner.
Background
In a PFC driving circuit of an air conditioner, the control of carrier frequency is realized by controlling the on and off of a switching tube. In the prior art, one of the pins of the switching tube is simultaneously connected to the control loop and the power loop in the PFC driving circuit, so that in the process of controlling the switching tube to be turned on and turned off at a high frequency, the switching tube is prone to generating an oscillating current, the control loop is interfered by the power loop, and further the switching loss of the switching tube is increased, and the reliability is reduced.
SUMMERY OF THE UTILITY MODEL
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The embodiment of the utility model provides a PFC drive circuit, circuit board and air conditioner parts power loop and control loop among the PFC drive circuit, prevents that interference signal from influencing drive module, reduces switching loss and generates heat.
An embodiment of the first aspect of the present invention provides a PFC driving circuit, including:
the power loop comprises a rectification module, a switch module and an inversion module which are sequentially connected, wherein the inversion module is connected with a motor of the air conditioner, the switch module comprises a switch tube, the switch tube comprises a first pin, a second pin and a control pin for controlling the connection and disconnection between the first pin and the second pin, the first pin is connected with the anode of the rectification module, and the second pin and the cathode of the rectification module are both connected to a simulation ground;
the control loop comprises a driving module, wherein the driving module comprises a signal input pin and a signal output pin, the signal input pin is connected with a control chip, the signal output pin is connected with the control pin to control the on-off of the switch tube, the switch tube further comprises a third pin, the third pin and a grounding pin of the driving module are both connected to a digital ground, and the third pin is electrically connected with the second pin in the switch tube.
According to the utility model discloses PFC drive circuit of first aspect embodiment has following beneficial effect at least: the second pin and the third pin are led out of the switch tube, so that the power loop is connected to an analog ground through the second pin, the control loop is connected to a digital ground through the third pin, a power loop and a control loop in the PFC driving circuit are separated, the influence of high-frequency current in the power loop on the control loop is avoided, the influence of lead wire inductance on the control loop on a driving module is eliminated, the switch tube can respond to a control signal of the driving module more quickly, switching at higher frequency is achieved, and the problem that the traditional PFC driving circuit limits the lifting of carrier frequency due to the heating of the switch tube is solved.
In some embodiments, the rectifier further comprises a capacitor and an inductor, the capacitor is connected in parallel between the first pin and the second pin, and the inductor is connected in series between the positive electrode of the rectifier module and the first pin. The PFC drive circuit of the application realizes circuit boosting through the capacitor device and the inductor device, wherein the inductor device is connected to the anode of the rectification module in series, the capacitor device is connected to two ends of the switch tube in parallel, and the duty ratio is adjusted through the conduction and the closing of the switch tube, so that the voltage input adjustment of the inversion module is realized.
In some embodiments, the capacitor device further comprises a switch power supply, a power taking end of the switch power supply is connected with the capacitor device to take power, and a power supply end of the switch power supply is connected with the driving module to supply power to the driving module. Because the driving module is driven by weak current, the direct current output of the switching power supply provides power input for the driving module.
In some embodiments, the inverter module further comprises a unidirectional conducting device connected in series between the positive electrode of the rectifying module and the inverting module. The unidirectional conducting device has the function of preventing the current of the capacitor device from reversely flowing to one side of the rectifier module in the discharging process of the capacitor device, and the safe operation of the PFC driving circuit can be ensured.
In some embodiments, a first lead inductance is included between the second pin and a connection point of the second pin and the third pin, a second lead inductance is included between the third pin and a connection point of the second pin and the third pin, and an inductance value of the first lead inductance is greater than an inductance value of the second lead inductance. In the high-frequency working process of the driving current, the first lead inductance generated by the second pin connected to the power loop is higher than the second lead inductance generated by the third pin connected to the control loop, and the first lead inductance on the power loop does not influence a control signal in the control loop any more, so that the driving module is favorable for outputting the control signal to control the switch tube.
In some embodiments, a resistor is further connected in series between the signal output pin of the driving module and the control pin of the switching tube. And a signal output pin of the driving module returns to the grounding pin of the driving module through the control pin and the third pin to form a control loop, and the resistor is used for dividing voltage so as to realize that the voltage of the signal output pin passes through the resistor and then obtain the voltage suitable for controlling the working of the switching tube.
In some embodiments, the rectifier module includes a first bridge arm and a second bridge arm connected to an ac power source, the first bridge arm and the second bridge arm are connected in parallel, and the first bridge arm and the second bridge arm are each composed of two diodes connected in series in the same direction. The first bridge arm and the second bridge arm form a rectifier bridge, wherein each bridge arm is formed by two diodes which are connected in series in the same direction, and therefore full-wave rectification is achieved.
In some embodiments, the switching tube is an MOS tube, a gate of the MOS tube is connected to the control pin, a drain of the MOS tube is connected to the first pin, and two leads separated from a source of the MOS tube are respectively connected to the second pin and the third pin. Compared with the existing three-pin MOS tube, the MOS tube of the embodiment has four pins, wherein the second pin and the third pin separated from the source electrode are respectively a conventional source electrode and a secondary source electrode, and the second pin and the third pin are led out from the source electrode through different lead inductances.
In some embodiments, the switch tube is a triode, a base of the triode is connected to the control pin, a collector of the triode is connected to the first pin, and two leads are separated from an emitter of the triode and connected to the second pin and the third pin respectively. Compared with the existing three-pin triode, the triode of the embodiment has four pins, wherein the second pin and the third pin which are separated from the emitter are respectively a conventional emitter and a secondary emitter, and the second pin and the third pin are led out by the emitter through different lead inductances.
In some embodiments, the switch tube is a packaged chip, and the first pin, the second pin, the third pin and the control pin are external pins of the packaged chip. The switching tube is solidified in a 4-pin packaging chip mode, and can be conveniently integrated in the PFC driving circuit according to the pin connection relation.
An embodiment of the second aspect of the present invention provides a circuit board, including the first aspect of the PFC driving circuit.
According to the utility model discloses circuit board of second aspect embodiment has following beneficial effect at least: the PFC driving circuit is arranged in the circuit board and used for driving a motor to work, a second pin and a third pin are led out from a switching tube in the PFC driving circuit, so that the power loop is connected to an analog ground through the second pin, the control loop is connected to a digital ground through the third pin, a power loop and a control loop in the PFC driving circuit are separated, the influence of high-frequency current in the power loop on the control loop is avoided, the influence of lead wire inductance on the control loop on a driving module is eliminated, therefore, the switching tube can respond to a control signal of the driving module more quickly, higher-frequency switching is achieved, and the problem that the traditional PFC driving circuit limits the lifting of carrier frequency due to the heating of the switching tube is solved.
An embodiment of the third aspect of the present invention provides an air conditioner, including the circuit board of the aforementioned second aspect.
According to the utility model discloses the air conditioner of third aspect embodiment has following beneficial effect at least: the circuit board is integrated in the air conditioner, so that the PFC driving circuit can be applied, the second pin and the third pin are led out from the switch tube in the PFC driving circuit, the power loop is connected to an analog ground through the second pin, the control loop is connected to a digital ground through the third pin, the power loop and the control loop in the PFC driving circuit are separated, the influence of high-frequency current in the power loop on the control loop is avoided, the influence of lead wire inductance on a driving module on the control loop is eliminated, the switch tube can respond to a control signal of the driving module more quickly, high-frequency switching is achieved, and the problem that the carrier frequency of a traditional PFC driving circuit is limited due to heating of the switch tube is solved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
Fig. 1 is a circuit diagram of a PFC driving circuit of an air conditioner in the prior art;
fig. 2 is a circuit diagram of a PFC driving circuit of an air conditioner according to an embodiment of the present invention;
fig. 3 is a simplified circuit diagram of the switching tube according to the embodiment of the present invention when the switching tube is a triode;
fig. 4 is a circuit module connection diagram provided by an example of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
The embodiment of the utility model provides a PFC drive circuit, circuit board and air conditioner, set up the switch tube of four pins in PFC drive circuit, and the switch tube through four pins separates PFC drive circuit's control loop and power loop, thereby avoid in air conditioner PFC drive circuit course of work, the lead wire inductance that high frequency current formed on power loop influences control loop's signal control, because this application separates the lead wire inductance on the power loop in power loop, consequently, power loop can more directly provide control signal to the switch tube, and then reduced the switching loss and the calorific capacity of switch tube, thereby make the switch tube can bear higher switching frequency in air conditioner PFC drive circuit, the problem of the carrier frequency and the calorific capacity restriction of each other of air conditioner PFC drive circuit has been solved.
The embodiments of the present invention will be further explained with reference to the drawings.
Referring to fig. 1, firstly, a conventional PFC driving circuit of an air conditioner is a PFC circuit applied to a motor, a rectifier module for rectifying ac mains power and an inverter module for driving the motor according to a bus voltage are simplified in fig. 1, and mainly considering the condition of a switching tube, in fig. 1, a triode is taken as an example, a collector of the triode is connected to an anode of the rectifier module, a base of the triode is connected to a control chip (not shown) corresponding to the PFC driving circuit, an emitter of the triode is connected to a cathode of the rectifier module, it can be seen that the drive chip forms a control loop corresponding to a weak current control circuit through the base and the emitter, and the rectifier module forms a power loop through the collector and the emitter, corresponding to a power supply circuit, that is, the control loop and the power loop share a same strong current emitter, thereby causing a parasitic inductance effect on the emitter during operation, the oscillation is generated, so that the switching loss of the switching tube is increased, and the switching speed of the switching tube is limited and the heat productivity of the switching tube is increased. Therefore, in the prior art, the PFC driving circuit of the air conditioner often cannot set a carrier frequency too high, which is generally controlled to be about 40KHz, because the increase of the carrier frequency can significantly increase the heat of the switching tube, which affects the stability of the PFC driving circuit. However, increasing the carrier frequency is beneficial to reducing ripple current and improving the electrical characteristics of the PFC driving circuit, so how to balance the carrier frequency and the heat generation of the switching tube is a very important issue in the air conditioner circuit technology field.
In order to solve the above problem, referring to fig. 2, an embodiment of the present invention provides a PFC driving circuit, including:
the power loop comprises a rectification module, a switch module and an inversion module which are sequentially connected, wherein the inversion module is connected with a motor of the air conditioner, the switch module comprises a switch tube, the switch tube comprises a first pin, a second pin and a control pin for controlling the connection and disconnection between the first pin and the second pin, the first pin is connected with the anode of the rectification module, and the second pin and the cathode of the rectification module are both connected to the analog ground;
the control loop comprises a driving module, wherein the driving module comprises a signal input pin and a signal output pin, the signal input pin is connected with a control chip, the control chip can be used as a Pulse Width Modulation (PWM) signal source to send a PWM signal to the signal input pin, the signal output pin is connected with the control pin to control the on-off of the switch tube, the switch tube further comprises a third pin, the third pin and a grounding pin of the driving module are both connected to a digital ground, and the third pin is electrically connected with the second pin in the switch tube.
The switching tube of the present application has four pins, a conventional pin portion includes a first pin and a control pin, and a second pin and a third pin belong to two pins separated in the same pole, and thus have the same contact inside the switching tube. According to the induced inductance effect, the same pole respectively passes through different lead inductances, so that the power loop and the control loop are respectively connected to different grounding ends, and the Kelvin connection is formed. Through the circuit connection method of the separation pin, the control loop bypasses the lead inductance of the power loop, so that on one hand, the heating value of the switch tube can be reduced, and on the other hand, the control loop can control the switch tube at higher frequency.
The switch tube can adopt different circuit structures, and different semiconductor devices can be adopted according to the actual requirement of the PFC driving circuit of the air conditioner; specifically, in some embodiments, the switching tube is an MOS tube, a base B of the MOS tube is connected to the control pin, a drain D of the MOS tube is connected to the first pin, and a source S of the MOS tube is separated into two leads which are respectively connected to the second pin and the third pin. In the embodiment, the MOS transistor is used as a switching transistor, and the four-pin MOS transistor provides an additional connection (kelvin connection) to the source S, which is used as a reference potential of the driving voltage of the base B, so that the influence of the voltage drop on the inductance of the source S is eliminated, and an undisturbed signal is transmitted to the driving chip in the control loop. Therefore, the driving module can realize faster switch switching on and off of the MOS tube, and the efficiency is improved.
Besides the MOS tube, the switch tube can also be a triode. Specifically, in some embodiments, referring to fig. 3, the switching tube is a triode, a gate G of the triode is connected to the control pin, a collector C of the triode is connected to the first pin, and an emitter E of the triode is separated into two leads respectively connected to the second pin and the third pin. Adopt the triode as switching device in this embodiment, provide emitter E and the secondary emitter E1 through the inductance of second lead wire of drawing forth through the first lead wire inductance, secondary emitter E1 and grid G constitute control loop, and emitter E and collector C constitute power loop, and two parts circuit does not influence each other, reduces the switching loss of triode to can promote switching speed, promote drive module's system performance. Thus, the switching device can operate at a lower temperature and a higher carrier frequency. In fact, the transistor of this embodiment is similar to the MOS transistor of the above embodiment, and the second pin and the third pin are connected through the kelvin emitter E, so that the influence of the lead inductance of the emitter E on the gate G control loop is eliminated, and the switching tube can respond to the driving module signal more quickly.
According to the connection method for separating the lead inductors, different lead inductors are respectively arranged between the second pin and the third pin from the connection contact of the second pin and the third pin, specifically, the second pin is led out through the first lead inductor, the third pin is led out through the second lead inductor, the inductance value of the first lead inductor is larger than that of the second lead inductor, compared with the situation that the same pin is simultaneously connected into a power loop and a control loop in the prior art, the lead inductor on the control loop is quite small, and therefore a control signal can be better sent to a switch tube for on-off control.
It is understood that, although the MOS transistor and the triode are used to exemplify the type of the switching transistor, the switching transistor does not necessarily form the whole of the switching module; in some embodiments, although the MOS transistor or the triode is a main device of the switch module, the switch module may further integrate other circuit elements, such as a resistance inductor around the switch device, for improving the operating characteristics of the switch device, increasing the operating efficiency of the switch module as a whole, and improving the heat generation level.
The control loop and the power loop are also connected to different grounding ends to realize circuit separation, wherein the control loop on the weak current signal side can be selectively connected to a digital ground, and the power loop on the strong current signal side can be selectively connected to an analog ground. The above-mentioned digital ground and analog ground are only examples, and in practical circuit application, different grounding ends may be selected as needed as long as the power loop and the control loop are separated into two loops, because different grounding positions may be set in the circuit and the corresponding grounding positions may have different grounding modes.
It can be understood that the PFC driving circuit of the air conditioner can provide a corresponding bus voltage according to a working condition of the motor, and in order to adjust the bus voltage, the PFC driving circuit according to an embodiment of the present application further includes a capacitor device and an inductor device, the capacitor device is connected in parallel between the first pin and the second pin, and the inductor device is connected in series between the anode of the rectifier module and the first pin. The capacitor device, the inductor device and the switch tube form a boost circuit, and the charge and discharge energy processes of the capacitor device and the inductor device are adjusted by controlling the duty ratio of the switch tube, so that the adjustment of the bus voltage is realized.
It can be understood that the switch tube can be integrated in the form of a packaged chip in the PFC driving circuit according to the embodiment of the present invention, as shown in fig. 2, the portion of the dashed line frame is a simplified representation of the packaged chip, and the packaged chip leads out four external pins respectively, that is, the first pin, the second pin, the third pin and the control pin are the external pins of the packaged chip, accordingly, the first lead inductor and the second lead inductor are integrated in the packaged chip, and the lead inductor does not need to be considered when the packaged chip is applied, so long as the pins of the packaged chip are distinguished. Therefore, the packaging chip can be directly integrated in the PFC driving circuit in the production process of the PFC driving circuit of the air conditioner, the circuit design process is simplified, and the reliability of the PFC driving circuit can be improved.
In fig. 2, a signal input end of the driving module is connected to a PWM signal source (control chip), and the switching tube is controlled to be turned on and off according to a duty ratio of the PWM signal source. Since the driving module also needs weak current driving, in order to avoid the influence of strong current on the control loop, the switching power supply is used for providing direct current voltage for the driving module, and therefore, in some embodiments, the PFC driving circuit further includes the switching power supply, the power taking end of the switching power supply is connected with the capacitor device to take power, and the power supply end of the switching power supply is connected with the driving module to supply power to the driving module. According to the working rule of the capacitor device, the voltage value at two ends of the capacitor device is a constant value when the duty ratio is stable, so that the switching power supply mainly supplies power to the driving module in a direct current-to-direct current mode to provide corresponding voltage Vd.
In order to avoid the reverse current flowing to the rectifying device when the capacitor device is discharged, especially when the switching speed of the switching tube is low, a device for limiting the current flowing direction needs to be added in the driving current. Specifically, the PFC driving circuit of this embodiment further includes a unidirectional conducting device, and the unidirectional conducting device is connected in series between the positive electrode of the rectifying module and the inverting module. Taking the unidirectional conducting device as an example of a power diode, since the discharging and charging directions of the capacitor device are opposite, the anode of the rectifier module is connected to one end of the capacitor device through the conducting direction of the power diode, and the cathode of the power diode is connected to the end of the capacitor device at the moment, so that current is prevented from flowing back to the anode of the rectifier module when the capacitor device discharges.
It can be understood that, when the driving module is an operational amplifier, the voltage output at the signal output terminal after the PWM signal is amplified may be relatively large, and a resistor Rg is further connected in series between the signal output pin of the driving module and the control pin of the switching tube. The output signal is subjected to voltage division through the resistor Rg, and the level value of the control pin input to the switching tube can be reduced. Based on the selection of the operational amplifier and the cost limitation, the level value can be adjusted simply and conveniently by adjusting the resistance value of the voltage Rg.
In order to realize the rectification of the alternating current, the present embodiment provides a structure of a rectifier bridge, and specifically, the rectifier module includes a first bridge arm and a second bridge arm connected to an alternating current power supply, the first bridge arm and the second bridge arm are connected in parallel, and the first bridge arm and the second bridge arm are both formed by connecting two diodes in series in the same direction. The connection point of the two diodes of the first arm is connected to one end of an alternating current input, the connection point of the two diodes of the second arm is connected to the other end of the alternating current input, the alternating current input is input from the first arm in a positive half cycle and output from the second arm, and the alternating current input is input from the second arm in a negative half cycle and output from the first arm, thereby realizing full-wave rectification of the alternating current. It is understood that, besides the above circuit structure, the rectifying module may also adopt other forms of circuits, such as totem-pole circuits, etc., which are not exemplified herein.
It can be understood that the embodiment of the utility model provides a be applied to the air conditioner field for the motor operation of drive air conditioner, because driving motor's PFC drive circuit often works in the high frequency state, calorific capacity that the high-speed switching of switch tube brought need be considered in PFC drive circuit's design process, the embodiment of the utility model provides a from the lead wire inductance that improves the switch tube, avoid lead wire inductance to influence drive chip's control signal, thereby separation control loop and power loop reduce the calorific capacity of switch tube.
The utility model discloses a switch tube of four pins separates the control loop and the power loop among the air conditioner PFC drive circuit, has avoided the influence that the lead wire inductance that switch tube pin produced led to the fact control signal in the high frequency is used, when having reduced calorific capacity of switch tube, still makes drive module can directly transmit control signal to the switch tube at control loop, and switch module's quick response also supports for the performance that air conditioner PFC drive circuit's high frequency operation provided.
The following describes an embodiment of the present invention with a practical example:
referring to fig. 4, an exemplary PFC driving circuit includes an ac source, a rectifier module, an inductor, a driving module, a switching tube, a power diode, a capacitor, a switching power supply, and an inverter module, wherein the inverter module is connected to a motor of an air conditioner, the ac source is connected to the rectifier module, an anode of the inductor and an anode of the power diode are sequentially connected, a cathode of the power diode is divided into two paths and respectively connected to one end of the capacitor and an anode input end of the inverter module, another end of the capacitor is connected to a cathode of the rectifier module, a signal input pin of the driving module is connected to a control chip (PWM signal source), and a signal output pin of the driving module is connected to a control pin of the switching tube through a resistor Rg, thereby controlling the switching tube to be turned on and off according to a PWM signal; two input ends of the switching power supply are connected in parallel with two ends of the capacitor device, and two output ends of the switching power supply are respectively connected with a power taking pin and a grounding pin of the driving module to provide working voltage Vd for the driving module; besides the control pin, the switch tube further comprises a first pin, a second pin and a third pin, the second pin and the third pin belong to two pins led out from the same pole of the switch tube, the first pin is connected to the connecting point of the inductance device and the power diode, the second pin is connected between the negative pole of the rectification module and the other end of the capacitance device and is connected with an analog ground, and the third pin is connected to the grounding pin of the driving module and is connected with a digital ground. Therefore, the positive electrode, the first pin, the second pin and the negative electrode of the rectifying module form a power loop, and the signal output pin, the control pin and the third pin of the driving module and the grounding pin of the driving module form a control loop.
The rectifier module comprises a first bridge arm and a second bridge arm which are connected with an alternating current power supply, the first bridge arm and the second bridge arm are connected in parallel, and the first bridge arm and the second bridge arm are formed by connecting two diodes in series in the same direction. The connection point of the two diodes of the first arm is connected to one end of an alternating current input, the connection point of the two diodes of the second arm is connected to the other end of the alternating current input, the alternating current input is input from the first arm in a positive half cycle and output from the second arm, and the alternating current input is input from the second arm in a negative half cycle and output from the first arm, thereby realizing full-wave rectification of the alternating current.
Wherein the switch tube is a four-pin packaged triode which comprises a base electrode B connected with the control pin, a collector electrode C connected with the first pin, an emitter electrode E connected with the second pin and a secondary emitter electrode E1 connected with the third pin, the emitter electrode E and the secondary emitter electrode E1 are respectively connected with the power loop and the control loop, when the PFC driving circuit of the air conditioner works, because the second pin corresponding to the emitter E and the third pin corresponding to the secondary emitter E1 are led out through different lead inductances, under the high-frequency application, the first lead inductance in the power loop is obviously higher than the second lead inductance in the control loop, therefore, in the present example, by separating the power loop and the control loop, the influence of the lead inductance in the power loop on the control signal of the control loop is avoided, the heat of the switching tube is reduced, and the switching tube can adapt to the driving signal with higher frequency.
The embodiment of the utility model provides a still provide a circuit board, including aforementioned PFC drive circuit. The PFC driving circuit is integrated on the circuit board, a power loop and a control loop in the PFC driving circuit are separated, and the influence of high-frequency current in the power loop on the control loop is avoided, so that the influence of lead inductance on a drive module on the control loop is eliminated, a switching tube can respond to a control signal of the drive module more quickly, high-frequency switching is achieved, and the problem that the traditional PFC driving circuit limits the improvement of carrier frequency due to the fact that the switching tube generates heat is solved.
The embodiment of the utility model provides an air conditioner is still provided, including aforementioned circuit board. The circuit board is arranged in the air conditioner to control a motor of the air conditioner, so that better power consumption control is realized; particularly, a power loop and a control loop in the PFC driving circuit are separated, and the influence of high-frequency current in the power loop on the control loop is avoided, so that the influence of lead inductance on the control loop on a driving module is eliminated, a switching tube can respond to a control signal of the driving module more quickly, switching at higher frequency is realized, and the problem that the traditional PFC driving circuit limits the lifting of carrier frequency due to the heating of the switching tube is solved.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are included in the scope of the present invention defined by the claims.
Claims (10)
1. A PFC driver circuit comprising:
the power loop comprises a rectification module, a switch module and an inversion module which are sequentially connected, wherein the inversion module is connected with a motor of the air conditioner, the switch module comprises a switch tube, the switch tube comprises a first pin, a second pin and a control pin for controlling the connection and disconnection between the first pin and the second pin, the first pin is connected with the anode of the rectification module, and the second pin and the cathode of the rectification module are both connected to a simulation ground;
the control loop comprises a driving module, wherein the driving module comprises a signal input pin and a signal output pin, the signal input pin is connected with a control chip, the signal output pin is connected with the control pin to control the on-off of the switch tube, the switch tube further comprises a third pin, the third pin and a grounding pin of the driving module are both connected to a digital ground, and the third pin is electrically connected with the second pin in the switch tube.
2. The PFC driving circuit of claim 1, further comprising a capacitive device connected in parallel between the first pin and the second pin and an inductive device connected in series between an anode of the rectifier module and the first pin.
3. The PFC driving circuit according to claim 2, further comprising a switching power supply, wherein a power taking terminal of the switching power supply is connected with the capacitor device to take power, and a power supply terminal of the switching power supply is connected with the driving module to supply power to the driving module.
4. The PFC driving circuit of claim 2, further comprising a unidirectional conduction device connected in series between the positive electrode of the rectification module and the inversion module.
5. The PFC driving circuit of claim 1, wherein a first lead inductance is included between the second pin and a connection point between the second pin and the third pin, a second lead inductance is included between the third pin and a connection point between the second pin and the third pin, and an inductance value of the first lead inductance is greater than an inductance value of the second lead inductance.
6. The PFC driving circuit according to claim 1, wherein the rectification module comprises a first bridge arm and a second bridge arm connected with an alternating current power supply, the first bridge arm and the second bridge arm are connected in parallel, and the first bridge arm and the second bridge arm are formed by connecting two diodes in series in the same direction.
7. The PFC driving circuit according to claim 1, wherein the switching tube is an MOS tube, a gate of the MOS tube is connected with the control pin, a drain of the MOS tube is connected with the first pin, and two leads separated from a source of the MOS tube are respectively connected with the second pin and the third pin;
alternatively, the first and second electrodes may be,
the switch tube is a triode, the base of the triode is connected with the control pin, the collector of the triode is connected with the first pin, and two leads are separated from the emitter of the triode and are respectively connected with the second pin and the third pin.
8. The PFC driving circuit of any of claims 1 to 7, wherein the switching tube is a packaged chip, and the first pin, the second pin, the third pin and the control pin are external pins of the packaged chip.
9. A circuit board comprising the PFC driver circuit according to any one of claims 1 to 8.
10. An air conditioner characterized by comprising the wiring board of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120500463.XU CN214380652U (en) | 2021-03-09 | 2021-03-09 | PFC drive circuit, circuit board and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120500463.XU CN214380652U (en) | 2021-03-09 | 2021-03-09 | PFC drive circuit, circuit board and air conditioner |
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| Publication Number | Publication Date |
|---|---|
| CN214380652U true CN214380652U (en) | 2021-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120500463.XU Active CN214380652U (en) | 2021-03-09 | 2021-03-09 | PFC drive circuit, circuit board and air conditioner |
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| Country | Link |
|---|---|
| CN (1) | CN214380652U (en) |
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2021
- 2021-03-09 CN CN202120500463.XU patent/CN214380652U/en active Active
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