CN219499210U - Variable frequency controller - Google Patents
Variable frequency controller Download PDFInfo
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- CN219499210U CN219499210U CN202223094494.3U CN202223094494U CN219499210U CN 219499210 U CN219499210 U CN 219499210U CN 202223094494 U CN202223094494 U CN 202223094494U CN 219499210 U CN219499210 U CN 219499210U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The application discloses frequency conversion controller, its characterized in that includes: the power input interface is connected with a power supply; the first sampling module is used for sampling the current of the power input interface; the rectification module rectifies the current of the power input interface; the power factor correction module is connected with the rectification module and is used for carrying out power correction on the output current of the rectification module; the second sampling module is connected with the power factor correction module, is used for sampling the output current of the power factor correction module, is connected with the first sampling module, the second sampling module and the power factor correction module, and is connected with the control module, and the driving module is used for driving a load. The frequency conversion controller can be suitable for direct current or alternating current input, and the power factor correction module can reduce the input current during alternating current power supply, so that a relatively thinner input power line can be used, the use cost of a user is obviously reduced, and resources are saved.
Description
Technical Field
The utility model relates to the technical field of frequency conversion control, in particular to a frequency conversion controller.
Background
Solar energy is an important renewable energy source, and the resources are rich and clean. On the premise of environmental protection, how to utilize renewable energy sources such as solar energy and the like and convert the renewable energy sources into electric energy is one of the popular researches in the field of clean energy at present. At present, besides the photoelectric conversion efficiency, solar power generation has the defects of poor stability and great influence of weather.
In order to enable the equipment to stably operate, when solar power generation is limited, the equipment needs to be connected with 220V alternating current for use, and therefore the equipment needs to be correspondingly provided with a variable frequency controller to realize switching of different power supply modes.
The existing deep well water pump has the defects that the power line is long because of the large well depth, when alternating current is used for supplying power, a power factor correction circuit in a deep well water pump controller can be started, the input power factor is improved, the input current of the power line is reduced, the deep well water pump can select thinner power lines under the same power, and the power line of the deep well water pump is usually 100 meters, 200 meters or longer, so that a great amount of cost can be saved if the thinner power lines are selected. When the photovoltaic array using solar energy is used for power supply, the power factor correction circuit needs to be turned off.
Therefore, it is desirable to design a variable frequency controller to meet the above requirements of both ac and photovoltaic.
Disclosure of Invention
The utility model aims to provide a variable frequency controller so as to solve the existing technical problems and meet the requirements of alternating current and photovoltaic dual-purpose.
The utility model provides a variable frequency controller, which is characterized by comprising the following components: the power input interface is connected with a power supply and is used for receiving direct current power supply or alternating current power supply; the first sampling module is connected with the power input interface and is used for sampling the current of the power input interface; the rectification module is connected with the power input interface and used for rectifying the current of the power input interface; the power factor correction module is connected with the rectification module and is used for carrying out power correction on the output current of the rectification module; the second sampling module is connected with the power factor correction module and is used for sampling the output current of the power factor correction module; the first input end of the control module is connected with the first sampling module, receives a first voltage sampling signal output by the first sampling module, and outputs a switch control signal according to the first voltage sampling signal and a first voltage threshold value; the first output end of the control module is connected with the power factor correction module, and when the power input interface receives direct current power supply, the first output end of the control module outputs an invalid switch control signal to the power factor correction module, and the power factor correction module does not work; when the power input interface receives alternating current power supply, the first output end of the control module outputs an effective switch control signal, and the power factor correction module works; the second output end of the control module is connected with the driving module, and outputs a driving signal to the driving module to control the load to work.
Preferably, a second input end of the control module is connected with the second sampling module, and receives a second voltage sampling signal output by the second sampling module; when the second input end of the control module receives an abnormal voltage sampling signal, the first output end of the control module outputs an invalid switch control signal to close the power factor correction module, and the second output end of the control module outputs a driving signal to control the driving module to stop working.
Preferably, the first sampling module includes: the positive electrode of the first diode is connected with a first power supply line of the power supply; the anode of the second diode is connected with a second power supply line of the power supply; the first end of the first sampling resistor is connected with the cathodes of the first diode and the second diode; the first end of the second sampling resistor is connected with the second end of the first sampling resistor; the first end of the third sampling resistor is connected with the second end of the first sampling resistor, and the second end of the third sampling resistor is grounded; the first end of the first capacitor is connected with the second end of the second sampling resistor, and the second end of the first capacitor is grounded; and the anode of the third diode is connected with the first end of the first capacitor, and the cathode of the third diode is connected with the first voltage end.
Preferably, the power factor correction module includes: the PFC chip comprises a current amplifier input end, a current amplifier output end, a control end, a power supply end and a grounding end; the boost conversion unit is connected with the current amplifier input end, the current amplifier output end and the control end of the PFC chip respectively and comprises a current input end connected with the rectifying module and a current output end for supplying power; and one end of the enabling unit is connected with the control module, and the other end of the enabling unit is connected with the power supply end of the PFC chip to control whether the PFC chip works or not by controlling the power supply of the PFC chip.
Preferably, the boost conversion unit includes: the first end of the first inductor is connected with the current input end; the first end of the second capacitor is connected with the current input end; the anode of the fourth diode is connected with the second end of the first inductor, and the cathode of the fourth diode is connected with the current output end; the first end of the first resistor is connected with the second end of the second capacitor and is connected with the input end of the current amplifier of the PFC chip; the collector of the first switching tube is connected with the second end of the first inductor, and the emitter of the first switching tube is connected with the second end of the first resistor; the first end of the second resistor is connected with the base electrode of the first switching tube, and the second end of the second resistor is connected with the control end of the PFC chip; the first end of the third resistor is connected with a node between the cathode of the fourth diode and the current output end; the first end of the fourth resistor is connected with the second end of the third resistor, and the second end of the fourth resistor is connected with the output end of the current amplifier of the PFC chip; the first end of the fifth resistor is connected with the second end of the fourth resistor and the output end of the current amplifier of the PFC chip, and the second end of the fifth resistor is grounded; and the first end of the second capacitor is connected with the cathode of the fourth diode and the current output end, and the second end of the second capacitor is connected with the second end of the first resistor and grounded.
Preferably, the enabling unit includes: the second voltage end is used for providing working voltage for the PFC chip; the emitter of the second switching tube is connected with the second voltage end; the collector electrode of the second switching tube is connected with the third voltage end and then connected with the power supply end of the PFC chip; the first end of the sixth resistor is connected with the base electrode of the second switching tube; the first end of the seventh resistor is connected with the control module and is used for acquiring a control signal; and the base electrode of the third switching tube is connected with the second end of the seventh resistor, the emitting electrode of the third switching tube is grounded, and the collecting electrode of the third switching tube is connected with the second end of the sixth resistor.
Preferably, the control module monitors the output of the power factor correction module through the second sampling module, when the second input end of the control module receives the abnormal voltage sampling signal, the first output end of the control module outputs an invalid switch control signal to close the power factor correction module, and the second output end of the control module outputs a driving signal to control the driving module to reduce the output power.
The variable frequency controller provided by the utility model can be suitable for two power supply input modes of direct current input or alternating current input, and the power factor correction module can reduce the input current during alternating current power supply, so that a relatively thinner input power line can be used under the condition of certain power, the use cost of a user is obviously reduced, and the resources are saved; meanwhile, when alternating current is supplied, the variable frequency controller is also provided with a protection mechanism, and the two sampling modules can also track and monitor the running condition of the whole circuit in real time, so that the reliable running of the circuit is ensured, and when faults occur, the variable frequency controller can also carry out the output of the reduced line and ensure the safety of an input power line, the variable frequency controller and a load.
Drawings
The above and other objects, features and advantages of the present utility model will become more apparent from the following description of embodiments of the present utility model with reference to the accompanying drawings.
FIG. 1 shows a schematic diagram of a power supply system of a variable frequency controller according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a first voltage sampling module of a variable frequency controller according to an embodiment of the present utility model;
FIGS. 3a to 3d are diagrams showing waveforms of the power supply in different power modes according to the embodiment of the present utility model;
fig. 4 shows a schematic circuit diagram of a power factor correction module of a variable frequency controller according to an embodiment of the utility model.
Detailed Description
The utility model will be described in more detail below with reference to the accompanying drawings. Like elements are denoted by like reference numerals throughout the various figures. For clarity, the various features of the drawings are not drawn to scale. Furthermore, some well-known portions may not be shown.
It will be understood that when an element or module is referred to as being "in front of" another element or module, it can be directly on or connected to the front end of the other element or module circuit or other elements or modules can be included between the element or module. And if part of the modules can also adjust the positions and the adjacent relations according to the needs.
If, for the purposes of describing a situation directly preceding another component, another module, the expression "directly preceding … …" or "preceding … … and adjoining" will be used herein.
Numerous specific details of some embodiments of the utility model, such as specific circuit configurations, component models, numbers, and connections of modules, are set forth below in order to provide a more thorough understanding of the utility model. However, as will be understood by those skilled in the art, the present utility model may be practiced without these specific details.
The utility model may be embodied in various forms, some examples of which are described below.
FIG. 1 shows a schematic diagram of a power supply system of a variable frequency controller according to an embodiment of the present utility model; the load is, for example, deep well water pump 300, and deep well water pump 300 adopts, for example, three-phase power, and power supply 100 includes direct current power supply module 110 provided by a photovoltaic array module or alternating current power supply module 120 provided by an urban power grid, and one of the two power supply modules is selected as required to supply power to variable frequency controller 200.
The variable frequency controller 200 includes: the power input interface 210, the first sampling module 220, the rectifying module 230, the power factor correction module 240, the second sampling module 260, the control module 250 and the driving module 270, wherein the driving module 270 is connected with the deep well water pump 300, and the driving module 270 drives the deep well water pump 300 to operate under the control of the control module 250.
The power input interface 210 of the variable frequency controller 200 is used for being connected with the power supply 100 to allow direct current power supply or alternating current power supply to be connected, the first sampling module 220 is connected with the power input interface 210 and the control module 250, the input voltage of the power input interface 210 is sampled through the first sampling module 220 and provided to the control module 250, the control module 250 calculates and judges the power input mode (direct current or alternating current), and accordingly enables the power factor correction module 240, specifically, if the power supply 100 provides alternating current power supply, the power factor correction module 240 is turned on, if the power supply 100 provides direct current power supply, the power factor correction module 240 is turned off. The rectifying module 230 is connected to the power input interface 210, rectifies the current input thereto, and provides the rectified current to the power factor correction module 240, and the power factor correction module 240 performs power correction, specifically, the rectifying module 230 performs rectifying function when the input is ac, and performs reverse connection preventing function when the input is dc. The current passing through the power factor correction module 240 is sampled by the second sampling module 260 and provided to the control module 250, and finally the control module 250 provides a driving signal to the driving module 270 and controls the driving module 270 to drive the deep well water pump 300 to work.
Fig. 2 shows a schematic diagram of a first sampling module of a variable frequency controller according to an embodiment of the present utility model, where the first sampling module includes, for example, three diodes D1 to D3, five sampling resistors RS1 to RS5, and a capacitor C1, where two input lines of the power supply 100 are respectively connected to anodes of the diodes D1 and D2, and cathodes of the diodes D1 and D2 are connected to a first end of the sampling resistor RS1 after being connected to cathodes of the diodes D1, and two input lines of the power supply 100 are, for example, a live wire N and a zero wire L, respectively, and of course, may also be anodes and cathodes of direct current power supply. The second end of sampling resistor RS1 links to each other with sampling resistor RS 2's first end, sampling resistor RS 2's second end links to each other with sampling resistor RS 3's first end, sampling resistor RS 3's second end links to each other with sampling resistor RS 4's first end and sampling resistor RS 5's first end respectively, sampling resistor RS 4's second end links to each other and is as sampling output with capacitor C1's first end, sampling resistor RS 5's second end links to each other with capacitor C1's second end and ground connection, second capacitor C1's first end still links to each other with diode D3's negative pole, diode D3's positive pole links to each other U1 with first voltage end. Specifically, the resistances of the sampling resistors RS1 to RS3 are the same and are all 330kΩ, the resistance of the sampling resistor RS4 is, for example, 1kΩ, the resistance of the sampling resistor RS5 is, for example, 2kΩ, and the first voltage terminal U1 provides a voltage of +5v.
Further, the first sampling module 220 may not be directly connected to the power input interface 210, and the first sampling module 220 may be placed after the rectifying module 230 and before the pfc module 240, that is, the first sampling module 220 samples between the rectifying module 230 and the pfc module 240, and the two diodes D1 and D2 of the first sampling module 220 may be omitted because the rectifying module 230 is passed.
Fig. 3a to 3d are waveform diagrams of power supply in different power supply modes according to an embodiment of the present utility model; as shown in fig. 3a, the power supply 100 provides, for example, alternating current, and the waveform diagram thereof is sine wave; fig. 3b to 3d are all solar voltage (direct current) provided by the photovoltaic array module by the power supply 100, when illumination is stable, the waveform diagram is shown in fig. 3b, when illumination is strong, the waveform diagram is shown in fig. 3c, when illumination is weak, the waveform diagram is shown in fig. 3d, in conclusion, when the power supply 100 provides direct current, the power supply voltage is affected by illumination intensity, the power supply voltage is positively related to the illumination intensity, and the voltage fluctuates within a certain range along with the intensity change of illumination.
According to the characteristics and differences of the waveform diagrams of the alternating current and the direct current, the control module 250 may detect the current provided by the first sampling module 220 to determine whether the power supply 100 adopts alternating current power supply or direct current power supply, specifically, the first sampling module 220 collects a voltage maximum value Vmax and a voltage minimum value Vmin within a preset time, when Vmax/Vmin is greater than a first threshold, it determines that the power supply 100 provides alternating current power supply, and when Vmax/Vmin is not greater than the first threshold, it determines that the power supply 100 provides direct current power supply, that is, photovoltaic power supply, and the preset time is not less than one half period of a sine wave of alternating current power supply. When the power supply 100 supplies alternating current, the Vmax/Vmin ratio is very large, and when the power supply 100 supplies direct current, the Vmax/Vmin ratio is relatively small, typically less than 2.
The control module 250 obtains the voltage signal of the first sampling module 220, if the value of V1max/V1min is greater than the preset value P1 (for example, p1=2), it determines that ac power is supplied, otherwise dc power is supplied, specifically, the control module 230 may perform filtering before calculating and determining when processing.
FIG. 4 is a schematic circuit diagram of a PFC module of a variable frequency controller according to an embodiment of the present utility model; the power factor correction module includes: boost conversion unit 100, PFC chip 200, and enable unit 300.
The boost converting unit 100 includes an input end Vin, an inductor L1, a capacitor C2, resistors R1 to R5, a switching tube Q1, a diode D4, an output end Vout and a large capacitor E1, where the input end Vin is connected to a first end of the inductor L1 and a first end of the capacitor C2, a second end of the inductor L1 is connected to a collector of the switching tube Q1 and an anode of the diode D4, a cathode of the diode D4 is connected to a first end of the resistor R3 and a first end of the large capacitor E1, a first end of the large capacitor E1 is connected to an output end Vout, a second end of the large capacitor E1 is grounded, a node between the capacitor C2 and the resistor R1 is connected to an input end ISENSE of a current amplifier of the PFC chip 200, a second end of the resistor R1 is connected to an emitter of the switching tube Q1 and a second end of the large capacitor E1, a base of the switching tube Q1 is connected to a first end of the resistor R2, a second end of the resistor R2 is connected to a first end of the resistor R3 and a second end of the PFC chip 200, a second end of the resistor R4 is connected to a second end of the resistor R5, and a second end of the resistor 200 is connected to a first end of the resistor 2.
The enabling unit 300 comprises a control end RE, resistors R6 and R7, power supply ends VCC1 and VCC2, and switching tubes Q2 and Q3, which are connected with the control module; the power supply end VCC2 is connected with the emitter of the switching tube Q2, the power supply end VCC1 is connected with the collector of the switching tube Q2 and the power supply end VCC of the PFC chip 200, the base of the switching tube Q2 is connected with the first end of the resistor R6, the second end of the resistor R6 is connected with the collector of the switching tube Q3, the control end RE is connected with the first end of the resistor R7, the second end of the resistor R7 is connected with the base of the switching tube Q3, and the emitter of the switching tube Q3 is grounded.
Specifically, when the control module 250 determines that the power supply 100 provides dc power, the control module 250 lowers the potential of the control end RE, so that the switching tube Q3 is not turned on, the switching tube Q2 is not turned on, the power supply end VCC of the PFC chip cannot obtain the required power supply and does not work, the switching tube Q1 is not turned on, the inductor L1 is not charged, the power input point is the input end Vin, the power output point is the output end Vout, and Vout is substantially the same as Vin.
When the control module 250 judges that the power supply 100 provides ac power, the control module 250 turns the control end RE high, the switching tube Q3 is turned on, the switching tube Q2 is turned on, the power supply end VCC of the PFC chip obtains the required power supply, the PFC chip starts to work, and the switching tube Q1 is controlled by the PFC chip to be turned on and off periodically, so as to realize the PWM function. When the switching tube Q1 is turned on, the inductor L1 is shorted to ground, the diode D4 is turned off, and the input terminal Vin charges the inductor L1 to charge the voltage across the inductor L1 to Vin. When the switching tube Q1 is turned off, the current on the inductor L1 is not immediately reduced, and the voltage is not immediately reversed, so that the current direction is unchanged, the large capacitor E1 is charged through the diode D4, the voltage at the output end Vout is filtered into direct current through the filtering of the large capacitor E1, the filtered direct current voltage is monitored through the voltage monitoring circuit formed by the resistors R3 to R5 and fed back to the PFC chip, and the PFC chip regulates and controls the duty ratio of the switching tube Q1 through the control end GATE, so that closed-loop voltage control is formed. The output voltage of the output terminal Vout is generally designed to be 390V-420V. The control module 250 collects whether the output voltage of the output terminal Vout is a design value through the second sampling module 260, and determines whether the pfc module 240 is in a normal operating state, and whether a fault occurs.
In order to illustrate how the variable frequency controller according to the embodiment of the present utility model works, a specific working process of the variable frequency controller and handling of various faults will be briefly described below.
Firstly, the variable frequency controller is electrified, a first sampling module in the variable frequency controller samples input voltage, for example, the maximum voltage Vmax and the minimum voltage Vmin (first sampling information) of the variable frequency controller are obtained in preset time, and the two values are provided for a control module, wherein the preset time is not less than one half of an alternating current period, and if the ratio of the Vmax to the Vmin is greater than a first threshold (for example, 2), the control module judges that the input current is alternating current, and otherwise, the input current is judged to be direct current.
When the input is direct current, the power factor correction module is closed, the direct current drives the deep well water pump to operate, the control module tracks the maximum power point (Maximum Power Point Tracking, MPPT) of the driving module, and the load and the operation condition of the driving module are detected.
When the input is alternating current, the control module sets the control end RE of the power factor correction module at a high potential, namely, starts the power factor correction module, acquires the output voltage Vout (second sampling voltage) of the power factor correction module through the second sampling module, and judges whether the output Vout of the power factor correction module accords with a design value (second threshold value).
If the output Vout does not accord with the design value, judging that the power factor correction module is in fault, closing the power factor correction module by the control module, and reducing the power by the driving module to output so as to drive the deep well water pump to work. Specifically, if the pfc module is operating normally, the output power of the driving module is, for example, pmax, and when the pfc module is turned off, the output power of the driving module is, for example, P1, where P1 is measured to be about seventy percent of Pmax.
If the output Vout accords with the design value, the power factor correction module works normally, and the driving module operates at maximum power to drive the deep well water pump to operate. In operation, the control module monitors the second sampled voltage at a time, and monitors whether the voltage value of Vout suddenly drops by an amount exceeding a preset value (e.g., 10V).
If the voltage value of Vout decreases in a short time to a magnitude exceeding a preset value, judging that the power factor correction module is overloaded or damaged, and controlling the driving module to stop working and closing the power factor correction module by the control module; waiting for a preset time (e.g., 2 seconds) and restarting the pfc module. And in a preset time (such as 10 seconds), the output Vout is restored to a designed output value, so that the power factor correction module is normal, and the driving module drives the deep well water pump to operate at the maximum power. If the output Vout of the power factor correction module fails to recover to the designed output value within the preset time, the power factor correction module is turned off, and the drive module reduces the output limit.
If the voltage value of Vout does not decrease in a short time beyond the preset value, the power factor correction module is indicated to work normally, and the driving module continues to operate at the maximum power. At this time, the control module monitors whether the input voltage provided by the power supply suddenly drops through the first sampling module.
If the input voltage provided by the power supply does not suddenly drop, returning to the previous step, and continuously monitoring whether the second sampling voltage drops beyond a preset value.
If the input voltage provided by the power supply suddenly drops, the driving module is immediately turned off, and the input voltage provided by the power supply is waited to be recovered to be normal; by closing the driving module in time, the overload of the power factor correction module can be effectively prevented, and particularly, when power is lost, if the power factor correction module is not protected, the power factor correction module is extremely damaged.
When the input voltage provided by the power supply is recovered to be normal, starting the driving module again and returning to the step of monitoring whether the second sampling voltage drops beyond a preset value; if the input voltage provided by the power supply fails to return to normal, the standby is continued.
The variable frequency controller provided by the utility model can be suitable for two power supply input modes of direct current input or alternating current input, and the power factor correction module can reduce the input current during alternating current power supply, so that a relatively thinner input power line can be used under the condition of certain power, the use cost of a user is obviously reduced, and the resources are saved; meanwhile, when alternating current is supplied, the variable frequency controller is also provided with a protection mechanism, and the two sampling modules can also track and monitor the running condition of the whole circuit in real time, so that the reliable running of the circuit is ensured, and when faults occur, the variable frequency controller can also carry out the output of the reduced line and ensure the safety of an input power line, the variable frequency controller and a load.
In the above description, technical details such as the position combinations and the connection modes of the respective components are not described in detail. Those skilled in the art will appreciate that the desired connection relationships, etc., may be formed by a variety of techniques. In addition, in order to have the same function, a person skilled in the art may also design a structure that is not exactly the same as the structure described above. In addition, although the embodiments are described above separately, this does not mean that the measures in the embodiments cannot be used advantageously in combination.
The embodiments of the present utility model are described above. However, these examples are for illustrative purposes only and are not intended to limit the scope of the present utility model. The scope of the utility model is defined by the appended claims and equivalents thereof. Various alternatives and modifications can be made by those skilled in the art without departing from the scope of the utility model, and such alternatives and modifications are intended to fall within the scope of the utility model.
Claims (7)
1. A variable frequency controller, comprising:
the power input interface is connected with a power supply and is used for receiving direct current power supply or alternating current power supply;
the first sampling module is connected with the power input interface and is used for sampling the current of the power input interface;
the rectification module is connected with the power input interface and used for rectifying the current of the power input interface;
the power factor correction module is connected with the rectification module and is used for carrying out power correction on the output current of the rectification module;
the second sampling module is connected with the power factor correction module and is used for sampling the output current of the power factor correction module;
the first input end of the control module is connected with the first sampling module, receives a first voltage sampling signal output by the first sampling module, and outputs a switch control signal according to the first voltage sampling signal and a first voltage threshold value;
the first output end of the control module is connected with the power factor correction module, and when the power input interface receives direct current power supply, the first output end of the control module outputs an invalid switch control signal to the power factor correction module, and the power factor correction module does not work; when the power input interface receives alternating current power supply, the first output end of the control module outputs an effective switch control signal, and the power factor correction module works;
the second output end of the control module is connected with the driving module, and outputs a driving signal to the driving module to control the load to work.
2. The variable frequency controller of claim 1, wherein a second input of the control module is connected to the second sampling module, and receives a second voltage sampling signal output by the second sampling module; when the second input end of the control module receives an abnormal voltage sampling signal, the first output end of the control module outputs an invalid switch control signal to close the power factor correction module, and the second output end of the control module outputs a driving signal to control the driving module to stop working.
3. The variable frequency controller of claim 1, wherein the first sampling module comprises:
the positive electrode of the first diode is connected with a first power supply line of the power supply;
the anode of the second diode is connected with a second power supply line of the power supply;
the first end of the first sampling resistor is connected with the cathodes of the first diode and the second diode;
the first end of the second sampling resistor is connected with the second end of the first sampling resistor;
the first end of the third sampling resistor is connected with the second end of the first sampling resistor, and the second end of the third sampling resistor is grounded;
the first end of the first capacitor is connected with the second end of the second sampling resistor, and the second end of the first capacitor is grounded;
and the anode of the third diode is connected with the first end of the first capacitor, and the cathode of the third diode is connected with the first voltage end.
4. The variable frequency controller of claim 1, wherein the power factor correction module comprises:
the PFC chip comprises a current amplifier input end, a current amplifier output end, a control end, a power supply end and a grounding end;
the boost conversion unit is connected with the current amplifier input end, the current amplifier output end and the control end of the PFC chip respectively and comprises a current input end connected with the rectifying module and a current output end for supplying power;
and one end of the enabling unit is connected with the control module, and the other end of the enabling unit is connected with the power supply end of the PFC chip to control whether the PFC chip works or not by controlling the power supply of the PFC chip.
5. The variable frequency controller of claim 4, wherein the boost conversion unit comprises:
the first end of the first inductor is connected with the current input end;
the first end of the second capacitor is connected with the current input end;
the anode of the fourth diode is connected with the second end of the first inductor, and the cathode of the fourth diode is connected with the current output end;
the first end of the first resistor is connected with the second end of the second capacitor and is connected with the input end of the current amplifier of the PFC chip;
the collector of the first switching tube is connected with the second end of the first inductor, and the emitter of the first switching tube is connected with the second end of the first resistor;
the first end of the second resistor is connected with the base electrode of the first switching tube, and the second end of the second resistor is connected with the control end of the PFC chip;
the first end of the third resistor is connected with a node between the cathode of the fourth diode and the current output end;
the first end of the fourth resistor is connected with the second end of the third resistor, and the second end of the fourth resistor is connected with the output end of the current amplifier of the PFC chip;
the first end of the fifth resistor is connected with the second end of the fourth resistor and the output end of the current amplifier of the PFC chip, and the second end of the fifth resistor is grounded;
and the first end of the second capacitor is connected with the cathode of the fourth diode and the current output end, and the second end of the second capacitor is connected with the second end of the first resistor and grounded.
6. The variable frequency controller of claim 4, wherein the enabling unit comprises:
the second voltage end is used for providing working voltage for the PFC chip;
the emitter of the second switching tube is connected with the second voltage end; the collector electrode of the second switching tube is connected with the third voltage end and then connected with the power supply end of the PFC chip;
the first end of the sixth resistor is connected with the base electrode of the second switching tube;
the first end of the seventh resistor is connected with the control module and is used for acquiring a control signal;
and the base electrode of the third switching tube is connected with the second end of the seventh resistor, the emitting electrode of the third switching tube is grounded, and the collecting electrode of the third switching tube is connected with the second end of the sixth resistor.
7. The variable frequency controller of claim 1, wherein the control module monitors the output of the pfc module via the second sampling module, and when the second input terminal of the control module receives the abnormal voltage sampling signal, the first output terminal of the control module outputs an invalid switching control signal to turn off the pfc module, and the second output terminal of the control module outputs a driving signal to control the driving module to reduce the output power.
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