Power factor correction circuit and power supply equipment

Abstract

The utility model discloses a power factor correction circuit and power supply equipment. The power factor correction circuit comprises a correction main module, a voltage sampling module and a main control module, the correction main module is used for correcting a power factor; the voltage sampling module is electrically connected with the correction main module, and the voltage sampling module is used for sampling the correction main module to generate sampling voltage; the input end of the main control module is electrically connected with the correction main module, the output end of the main control module is electrically connected with the voltage sampling module, and the main control module is used for outputting a first control signal or a second control signal according to the power of the correction main module; the voltage sampling module is used for starting sampling based on the first control signal and stopping sampling based on the second control signal. By adopting the scheme, the power consumption of the power factor correction circuit during no-load is reduced, and the energy efficiency of the power factor correction circuit is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, and in particular to a power factor correction circuit and a power supply device. Background Art

[0002] PFC circuit (Power Factor Correction) refers to a circuit used to improve the power factor of electric energy. Power factor refers to the relationship between effective power and total power consumption, that is, the ratio of effective power to total power consumption. The power factor can measure the degree to which electricity is effectively utilized. The larger the power factor value, the higher the power utilization rate. However, in the prior art, the voltage sampling module of the power factor correction circuit is connected to the circuit and participates in the work during the entire working period, which causes the voltage sampling module to have losses during the entire working process of the power factor correction circuit. Therefore, the power factor correction circuit has the problem of higher losses when no-load. Utility Model Content

[0003] The utility model provides a power factor correction circuit and power supply equipment to reduce the no-load power consumption of the power factor correction circuit.

[0004] According to one aspect of the utility model, a power factor correction circuit is provided, the power factor correction circuit comprising a correction main module, a voltage sampling module and a main control module;

[0005] The main correction module is used to correct the power factor;

[0006] The voltage sampling module is electrically connected to the correction main module, and the voltage sampling module is used to sample the correction main module to generate a sampling voltage;

[0007] The input end of the main control module is electrically connected to the correction main module, and the output end of the main control module is electrically connected to the voltage sampling module. The main control module is used to output a first control signal or a second control signal according to the power of the correction main module, and the voltage sampling module is used to start sampling based on the first control signal and stop sampling based on the second control signal.

[0008] In an optional embodiment of the utility model, the power factor correction circuit further includes a switch module, and the switch module is electrically connected between the main control module and the voltage sampling module;

[0009] The switch module is turned on based on the first control signal, and is turned off based on the second control signal;

[0010] The voltage sampling module is used to start sampling when the switch module is turned on, and stop sampling when the switch module is turned off.

[0011] In an optional embodiment of the present utility model, the voltage sampling module includes a voltage dividing unit and a first switch unit, and the first switch unit is connected in series with the voltage dividing unit;

[0012] The switch module is used to output a turn-on signal when turned on, and to output a turn-off signal when turned off;

[0013] The control end of the first switch unit is electrically connected to the switch module, and the first switch unit is used to be turned on based on the turn-on signal and turned off based on the turn-off signal.

[0014] In an optional embodiment of the present utility model, the switch module includes a first transistor, a first resistor and a first capacitor;

[0015] The collector of the first transistor is electrically connected to the power supply, the emitter of the first transistor is electrically connected to the voltage sampling module as the output end of the switch module, and the base of the first transistor is electrically connected to the main control module;

[0016] One end of the first resistor is electrically connected to the base of the first transistor, and the other end of the first resistor is electrically connected to the emitter of the first transistor;

[0017] One end of the first capacitor is electrically connected to the collector of the first transistor, and the other end of the first capacitor is electrically connected to the ground;

[0018] And / or, the voltage dividing unit includes an upper voltage dividing subunit and a lower voltage dividing subunit, and the voltage sampling module further includes a sampling filtering unit;

[0019] The first switch unit is connected in series between the upper voltage dividing subunit and the lower voltage dividing subunit;

[0020] One end of the upper voltage dividing subunit away from the first switch unit is electrically connected to the correction main module;

[0021] The sampling and filtering unit is connected in parallel with the lower voltage dividing subunit.

[0022] In an optional embodiment of the present utility model, the power factor correction circuit further includes an isolation module, which is electrically connected between the switch module and the main control module and is used to isolate the switch module from the main control module.

[0023] In an optional embodiment of the present utility model, the isolation module includes a photoelectric coupler, the light-emitting side of the photoelectric coupler is electrically connected to the main control module, and the light-receiving side of the photoelectric coupler is electrically connected to the switch module.

[0024] In an optional embodiment of the utility model, the power factor correction circuit further includes a correction control module;

[0025] The input end of the correction control module is electrically connected to the correction main module, the output end of the correction control module is electrically connected to the voltage sampling module, and the correction control module is used to control the correction main module to correct the power factor according to the sampled voltage;

[0026] The main control module is electrically connected to the correction control module, and the correction control module is used to work based on the first control signal and stop working based on the second control signal.

[0027] In an optional embodiment of the utility model, the correction main module includes a boost unit, a boost switch unit, a current sampling unit and a boost filter unit;

[0028] The input end of the boost unit is used to receive direct current, and the boost unit is used to boost the direct current;

[0029] The output end of the boost unit is electrically connected to the boost filter unit and the voltage sampling module, and the boost filter unit is used to filter the output voltage of the boost unit;

[0030] The control end of the boost unit is connected to the first end of the boost switch unit, the second end of the boost switch unit is electrically connected to the first end of the current sampling unit, the control end of the boost switch unit is connected to the output end of the correction control module, and the boost switch unit is used to control the working state of the boost unit;

[0031] The second end of the current sampling unit is connected to the third end of the boost switch unit, the third end of the current sampling unit is connected to the input end of the correction control module, and the current sampling unit is used to collect the current of the boost unit to generate a sampling current.

[0032] In an optional embodiment of the present utility model, the boost unit includes a first inductor, a second inductor, a first diode, a second diode, a first capacitor, and a second capacitor;

[0033] The first end of the first inductor is connected to direct current; the second end of the first inductor is connected to the first end of the second inductor; the second end of the second inductor is connected to the anode end of the first diode; the cathode end of the first diode is connected to the boost filter unit; the anode end of the second diode is connected to the second end of the first inductor; the cathode end of the second diode is connected to the cathode end of the first diode; the first end of the first capacitor is connected to the first end of the first inductor; the second end of the first capacitor is grounded; the first end of the second capacitor is connected to the second end of the first inductor; the second end of the second capacitor is connected to the second end of the first capacitor;

[0034] And / or, the boost switch unit includes: a first magnetic bead, a third MOS tube, a second voltage regulator diode, a first resistive element, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a twenty-third resistor, a twelfth capacitor and a fifth diode;

[0035] One end of the first magnetic bead is electrically connected to the boost unit, the other end of the first magnetic bead is electrically connected to the drain of the third MOS tube, the source of the third MOS tube is electrically connected to one end of the first resistive element, and the other end of the first resistive element is electrically connected to the ground; the gate of the third MOS tube is electrically connected to one end of the twelfth resistor, the other end of the twelfth resistor away from the third MOS tube is electrically connected to one end of the eleventh resistor, the other end of the eleventh resistor is electrically connected to the anode of the fifth diode, and the cathode of the fifth diode is electrically connected to the output end of the correction control module; one end of the thirteenth resistor is electrically connected to the output end of the correction control module, the other end of the thirteenth resistor is electrically connected to one end of the twelfth capacitor, and is electrically connected between the eleventh resistor and the twelfth resistor, and the other end of the twelfth capacitor is electrically connected to the gate of the third MOS tube; one end of the twenty-third resistor and the cathode of the second voltage stabilizing diode are both electrically connected to the gate of the third MOS tube, and the other end of the twenty-third resistor and the anode of the second voltage stabilizing diode are both electrically connected to the source of the third MOS tube;

[0036] And / or, the current sampling unit includes: a second resistive element, a third resistive element, a first capacitive element, an eighth capacitor, a fifth capacitor and a fourteenth resistor;

[0037] One end of the second resistive element is electrically connected to the boost switch unit, the other end of the second resistive element is electrically connected to one end of the third resistive element, the other end of the third resistive element is electrically connected to one end of the first capacitive element, the other end of the first capacitive element is electrically connected to the input end of the correction control module through the fourteenth resistor, one end of the fifth capacitor is electrically connected to the input end of the correction control module, the other end of the fifth capacitor is electrically connected to the ground, and the eighth capacitor is connected in parallel with the second resistive element.

[0038] In an optional embodiment of the present utility model, the power factor correction circuit further includes at least one of the following:

[0039] A rectifier module, the output end of which is electrically connected to the power supply end of the correction main module, and the rectifier module is used to convert alternating current into direct current;

[0040] The EMC filter module is used to suppress electromagnetic interference of alternating current.

[0041] According to another aspect of the present invention, a power supply device is provided, comprising the power factor correction circuit described in any embodiment of the present invention.

[0042] The technical solution of the embodiment of the utility model is to set a correction main module, a voltage sampling module and a main control module. The main control module can output a first control signal or a second control signal according to the power of the correction main module. The voltage sampling module is used to start sampling based on the first control signal and stop sampling based on the second control signal. Compared with the voltage sampling module of the power factor correction circuit in the related art, which is connected to the circuit and participates in the work during the whole working period, resulting in the loss of the voltage sampling module during the whole working process of the power factor correction circuit, the present application can start or stop sampling by the voltage sampling module according to the power situation of the correction main module. The voltage sampling module does not need to participate in the work during the whole working period, thereby reducing the power consumption of the power factor correction circuit when it is no-load and improving the energy efficiency of the power factor correction circuit.

[0043] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present utility model, nor are they intended to limit the scope of the present utility model. Other features of the present utility model will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0045] Figure 1 It is a circuit block diagram of a power factor correction circuit provided by an embodiment of the utility model;

[0046] Figure 2 It is a circuit block diagram of another power factor correction circuit provided by an embodiment of the utility model;

[0047] Figure 3 It is a circuit block diagram of another power factor correction circuit provided by an embodiment of the utility model;

[0048] Figure 4 It is a circuit block diagram of another power factor correction circuit provided by an embodiment of the utility model;

[0049] Figure 5 This is a circuit schematic diagram of a main control module provided by an embodiment of the utility model;

[0050] Figure 6 The utility model provides a circuit schematic diagram of a power factor correction circuit. DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0052] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0053] The embodiment of the utility model provides a power factor correction circuit, which can correct the power factor of the electric energy outputted by the power factor correction circuit and reduce the power consumption of the circuit. Figure 1 Schematic diagram of a power factor correction circuit provided by an embodiment of the utility model. Figure 1 As shown, the power factor correction circuit includes a correction main module 120 , a voltage sampling module 130 and a main control module 100 .

[0054] The correction main module 120 is used to correct the power factor. The correction main module 120 refers to a circuit module that can correct the power factor of the output electric energy. The voltage sampling module 130 is electrically connected to the correction main module 120, and the voltage sampling module 130 is used to sample the correction main module 120 to generate a sampled voltage. The voltage sampling module 130 refers to a module that can sample the voltage of the correction main module 120.

[0055] The input end of the main control module 100 is electrically connected to the correction main module 120, and the output end of the main control module 100 is electrically connected to the voltage sampling module 130. The main control module 100 is used to output a first control signal or a second control signal according to the power of the correction main module 120, and the voltage sampling module 130 is used to start sampling based on the first control signal and stop sampling based on the second control signal. Among them, the main control module 100 refers to a functional module for performing main logic control.

[0056] The first control signal and the second control signal are different electrical signals for instructing the voltage sampling module 130 to start sampling and stop sampling. In some embodiments, the first control signal is at a low level and the second control signal is at a high level; in some embodiments, the first control signal is at a high level and the second control signal is at a low level. This is not specifically limited here, but is only an example.

[0057] The power of the correction main module 120 can reflect the working state of the correction main module 120. For example, when the power factor correction circuit is unloaded, the power of the correction main module 120 is relatively small. In some embodiments, the main control module 100 can determine whether the power of the correction main module 120 is less than the power threshold, and output a second control signal when the power of the correction main module 120 is not less than the power threshold, and output a second control signal when the power of the correction main module 120 is less than the power threshold, so that the voltage sampling module 130 does not work when the correction main module 120 is unloaded, thereby reducing the no-load loss. It should be noted that the power threshold is the power size used to determine whether the power factor correction circuit is unloaded. In actual applications, the power threshold can be set according to actual conditions, and this embodiment does not limit this.

[0058] In the above scheme, by setting up a correction main module 120, a voltage sampling module 130 and a main control module 100, the main control module 100 can output a first control signal or a second control signal according to the power of the correction main module 120, and the voltage sampling module 130 is used to start sampling based on the first control signal and stop sampling based on the second control signal. Compared with the voltage sampling module 130 of the power factor correction circuit in the related art, which is connected to the circuit and participates in the work during the entire working period, resulting in the voltage sampling module 130 having losses during the entire working process of the power factor correction circuit, the present application can allow the voltage sampling module 130 to start sampling or stop sampling according to the power situation of the correction main module 120, and the voltage sampling module 130 does not need to participate in the work during the entire working period, thereby reducing the power consumption of the power factor correction circuit when it is no-load and improving the energy efficiency of the power factor correction circuit.

[0059] In an optional embodiment of the present utility model, as Figure 2 As shown, the power factor correction circuit also includes a switch module 110, which is electrically connected between the main control module 100 and the voltage sampling module 130; the switch module 110 is turned on based on the first control signal and turned off based on the second control signal; the voltage sampling module 130 is used to start sampling when the switch module 110 is turned on, and stop sampling when the switch module 110 is turned off. The switch module 110 refers to a module that can open a circuit, interrupt a current, or make it flow to other circuits. When the switch module 110 receives the first control signal, the switch module 110 is turned on, so the voltage sampling module 130 starts sampling; when the switch module 110 receives the second control signal, the switch module 110 is turned off, so the voltage sampling module 130 stops sampling. Therefore, in the above manner, the main control module 100 can control the voltage sampling module 130 to start sampling or stop sampling through the switch module 110.

[0060] In an optional embodiment of the present utility model, as Figure 3As shown, the voltage sampling module 130 includes a voltage dividing unit 131 and a first switch unit 132. The first switch unit 132 is connected in series with the voltage dividing unit 131. In some embodiments, the first switch unit 132 is connected in series with the voltage dividing unit 131 as a whole. In some embodiments, the voltage dividing unit 131 includes a plurality of voltage dividing sub-units. The first switch unit 132 is connected in series between the plurality of voltage dividing sub-units. The specific manner in which the first switch unit 132 and the voltage dividing unit 131 are connected in series is not specifically limited herein. The switch module 110 is used to output a conduction signal when it is turned on, and to output a shutdown signal when it is turned off; the control end of the first switch unit 132 is electrically connected to the switch module 110, and the first switch unit 132 is used to turn on based on the conduction signal, and to turn off based on the shutdown signal. The voltage dividing unit 131 generates a sampling voltage by dividing the voltage at the output end of the correction main circuit. Since the first switch unit 132 and the voltage divider unit 131 are connected in series, when the first switch unit 132 is turned on, the voltage divider unit 131 works and starts sampling; when the first switch unit 132 is turned off, the circuit where the voltage divider unit 131 is located is broken, the voltage divider unit 131 does not work, and sampling stops.

[0061] In an optional embodiment of the present utility model, as Figure 4 As shown, the power factor correction circuit also includes a correction control module 140; the input end of the correction control module 140 is electrically connected to the correction main module 120, the output end of the correction control module 140 is electrically connected to the voltage sampling module 130, and the correction control module 140 is used to control the correction main module 120 to correct the power factor according to the sampled voltage; the main control module 100 is electrically connected to the correction control module 140, and the correction control module 140 is used to work based on the first control signal and stop working based on the second control signal. Among them, the correction control module 140 can also work or stop working according to different signals output by the main control module 100, so as to further reduce the power consumption of the power factor correction circuit.

[0062] In an optional embodiment of the present invention, the control end of the correction control module 140 and the control end of the first switch unit 132 are both electrically connected to the output end of the switch module 110, so that the switch module 110 can simultaneously control the working states of the correction control module 140 and the voltage sampling module 130, that is, control the working states of the correction control module 140 and the voltage sampling module 130 synchronously, and when no-load, the voltage sampling module 130 can stop sampling and the correction control module 140 can stop working, thereby further reducing the power consumption of the power factor correction circuit.

[0063] In an optional embodiment of the present utility model, as Figure 5As shown, the main control module 100 implements the comparison between power and power threshold through hardware, for example, the main control module 100 includes a comparator, and the power and power threshold are compared by the comparator. In some embodiments, the main control module 100 implements the comparison between power and power threshold through a computer program, for example, the main control module 100 includes any programmable device among MCU, CPU, DSP, and FPGA. In the present embodiment, the main control module 100 is an MCU, and the main control module 100 includes a controller U6, and the controller U6 is used to implement the first control signal or the second control signal according to the power output of the correction main module 120. It can be understood that in other embodiments, the main control module 100 may include other devices, which are not specifically limited here, but are just given as examples.

[0064] In an optional embodiment of the present utility model, as Figure 5 and Figure 6 As shown, the VDD1 switch module 110 includes a first transistor Q1, a first resistor R1 and a first capacitor C1; the collector of the first transistor Q1 is electrically connected to the power supply VDD1, the emitter of the first transistor Q1 is electrically connected to the voltage sampling module 130 and the correction control module 140 as the output end of the switch module 110, and the base of the first transistor Q1 is electrically connected to the main control module 100; one end of the first resistor R1 is electrically connected to the base of the first transistor Q1, and the other end of the first resistor R1 is electrically connected to the emitter of the first transistor Q1; one end of the first capacitor C1 is electrically connected to the collector of the first transistor Q1, and the other end of the first capacitor C1 is electrically connected to the ground. The first transistor Q1 is specifically an NPN transistor. In this embodiment, the first control signal is specifically a high level, and the second control signal is specifically a low level. When the main control module 100 outputs a high level, the base of the first transistor Q1 is at a high level, so that the first transistor Q1 is turned on, and the first transistor Q1 outputs a turn-on signal through the collector; when the main control module 100 outputs a low level, the base of the first transistor Q1 is at a low level, so that the first transistor Q1 is turned off, and the first transistor Q1 outputs a turn-off signal through the collector.

[0065] In an optional embodiment of the present utility model, the switch module 110 also includes an anti-reverse diode D1, the anode of the anti-reverse diode D1 is electrically connected to the emitter of the first transistor Q1, and the cathode of the anti-reverse diode D1 is electrically connected to the voltage sampling module 130 and the correction control module 140 as the output end of the switch module 110, which can prevent the reverse flow of current from damaging the first transistor Q1 when a circuit fault occurs.

[0066] In an optional embodiment of the present utility model, the switch module 110 further includes a first zener diode ZD1 , a cathode of the first zener diode ZD1 is electrically connected to the base of the first transistor Q1 , and an anode of the first zener diode ZD1 is grounded.

[0067] In an optional embodiment of the present utility model, as Figure 4 As shown, the voltage dividing unit 131 includes a plurality of voltage dividing subunits, the first switch unit 132 is connected in series between the plurality of voltage dividing subunits, the plurality of voltage dividing subunits include an upper voltage dividing subunit 1311 and a lower voltage dividing subunit 1312, and the voltage sampling module 130 further includes a sampling filter unit 133; the first switch unit 132 is connected in series between the upper voltage dividing subunit 1311 and the lower voltage dividing subunit 1312; the end of the upper voltage dividing subunit 1311 away from the first switch unit 132 is electrically connected to the correction main module 120; the sampling filter unit 133 is connected in parallel with the lower voltage dividing subunit 1312. Specifically, the upper voltage dividing subunit 1311 and the lower voltage dividing subunit 1312 divide the output voltage of the correction main module 120 to generate a sampling voltage. Specifically, the sampling filter unit 133 filters out noise or interference in the sampling voltage to improve the purity and reliability of the sampling voltage.

[0068] In an optional embodiment of the present invention, the upper voltage dividing subunit 1311 and the lower voltage dividing subunit 1312 include at least one voltage dividing resistor.

[0069] For example, Figure 4 and Figure 6 As shown, the upper voltage-dividing subunit 1311 includes a second voltage-dividing resistor R2, a third voltage-dividing resistor R3, a fourth voltage-dividing resistor R4 and a fifth voltage-dividing resistor R5, which are sequentially connected in series between the output end of the correction main module 120 and the first switch unit 132. Specifically, the second voltage-dividing resistor R2, the third voltage-dividing resistor R3, the fourth voltage-dividing resistor R4 and the fifth voltage-dividing resistor R5 divide the output voltage of the correction main circuit 120 to generate a sampling voltage that meets the requirements.

[0070] In an optional embodiment of the present invention, the lower voltage dividing subunit 1312 includes a sixth voltage dividing resistor R6 and a seventh voltage dividing resistor R7. Specifically, the sixth voltage dividing resistor R6 is electrically connected between the first switch unit 132 and the ground, and the seventh voltage dividing resistor R7 is electrically connected between the first switch unit 132 and the correction control module 140.

[0071] In an optional embodiment of the present utility model, the sampling filter unit 133 includes a filter resistor R8 and a first filter capacitor C11, the filter resistor R8 and the first filter capacitor C11 are connected in parallel, and one end of the filter resistor R8 and the first filter capacitor C11 are electrically connected to the first switch unit 132, and the other end of the filter resistor R8 and the first filter capacitor C11 are electrically connected to the ground.

[0072] In an optional embodiment of the present utility model, the first switch unit 132 may be a switch tube. Figure 6, the first switch unit 132 may be composed of a sampling MOS transistor Q5, the gate of the sampling MOS transistor Q5 being electrically connected to the output end of the switch module 110 as the control end of the first switch unit 132, the source of the sampling MOS transistor Q5 being electrically connected to the lower voltage-dividing subunit 1312, and the drain of the sampling MOS transistor Q5 being electrically connected to the upper voltage-dividing subunit 1311. In this embodiment, the on signal is a high level, and the off signal is a low level. When the switch module 110 outputs an on signal, the sampling MOS transistor Q5 is turned on, so that current flows through the upper voltage-dividing subunit 1311 and the lower voltage-dividing subunit 1312, and the voltage sampling module 130 can start sampling; when the switch module 110 outputs an off signal, the sampling MOS transistor Q5 is turned off, so that the circuit between the upper voltage-dividing subunit 1311 and the lower voltage-dividing subunit 1312 is disconnected, and the voltage sampling module 130 stops sampling.

[0073] In an optional embodiment of the present utility model, as Figure 4-Figure 6 As shown, the power factor correction circuit further includes an isolation module 150, which is electrically connected between the switch module 110 and the main control module 100 and is used to isolate the switch module 110 from the main control module 100. The isolation module 150 can achieve electrical isolation between the input and the output, thereby improving the anti-interference ability and protection ability of the power factor correction circuit.

[0074] On the basis of the above embodiment, the isolation module 150 includes a photocoupler U11, the light-emitting side of the photocoupler U11 is electrically connected to the main control module 100, and the light-receiving side of the photocoupler U11 is electrically connected to the switch module 110. The main functions of the photocoupler U11 include isolation transmission and signal transmission. It realizes electrical isolation between input and output by converting electrical signals into optical signals and then converting them back into electrical signals, thereby improving the anti-interference ability and protection ability of the circuit.

[0075] Exemplarily, the isolation module 150 further includes a first protection resistor R10 and a second protection resistor R9, the light-emitting side of the photocoupler U11 has a first end and a second end, the first protection resistor R10 is connected in series between the output end of the main control module 100 and the first end of the photocoupler U11, and the second end of the photocoupler U11 is electrically connected to the ground. The light-receiving side of the photocoupler U11 has a third end and a fourth end, the second protection resistor R9 is connected in series between the collector of the first transistor Q1 and the third end of the photocoupler U11, and the fourth end of the photocoupler U11 is electrically connected to the base of the first transistor Q1.

[0076] In an optional embodiment of the present utility model, as Figure 6As shown, the correction main module 120 includes a boost unit 121, a boost switch unit 122, a current sampling unit 124 and a boost filter unit 123; the input end of the boost unit 121 is used to access direct current, and the boost unit 121 is used to boost the direct current. The output end of the boost unit 121 is electrically connected to the boost filter unit 123 and the voltage sampling module 130, and the boost filter unit 123 is used to filter the output voltage of the boost unit 121. The control end of the boost unit 121 is connected to the first end of the boost switch unit 122, the second end of the boost switch unit 122 is electrically connected to the first end of the current sampling unit 124, the control end of the boost switch unit 122 is connected to the output end of the correction control module 140, and the boost switch unit 122 is used to control the working state of the boost unit 121. The second end of the current sampling unit 124 is connected to the third end of the boost switch unit 122 , and the third end of the current sampling unit 124 is connected to the input end of the correction control module 140 . The current sampling unit 124 is used to collect the current of the boost unit 121 to generate a sampling current.

[0077] Specifically, the correction control module 140 generates a driving signal according to the sampled voltage collected by the voltage sampling module 130. The boost switch unit 122 controls the working state of the boost unit 121 according to the driving signal, thereby controlling the output voltage of the boost unit 121. Exemplarily, the correction control module 140 compares the sampled voltage collected by the voltage sampling module 130 with the reference voltage. When the sampled voltage is lower than the reference voltage, the correction control module 140 controls the boost switch unit 122 to extend the boost time of the boost unit 121, thereby increasing the output voltage of the boost unit 121; when the sampled voltage is higher than the reference voltage, the correction control module 140 controls the boost switch unit 122 to shorten the boost time of the boost unit 121, thereby reducing the output voltage of the boost unit 121. After the boost unit 121 boosts the DC power, the boost filter unit 123 filters the boosted DC power and outputs it to the load. The current sampling unit 124 samples the current output by the boost unit 121 to generate a sampled current. The correction control module 140 controls the correction main module 120 to perform power factor correction according to the sampled current and the sampled voltage.

[0078] In an optional embodiment of the utility model, the boost unit 121 includes a first inductor L1, a second inductor L2, a first diode D11, a second diode D12, a sixth capacitor C6 and a seventh capacitor C7; the first end of the first inductor L1 is connected to direct current; the second end of the first inductor L1 is connected to the first end of the second inductor L2; the second end of the second inductor L2 is connected to the anode end of the first diode D11; the cathode end of the first diode D11 is connected to the boost filter unit 123; the anode end of the second diode D12 is connected to the second end of the first inductor L1; the cathode end of the second diode D12 is connected to the cathode end of the first diode D11; the first end of the sixth capacitor C6 is connected to the first end of the first inductor L1; the second end of the sixth capacitor C6 is grounded; the first end of the seventh capacitor C7 is connected to the second end of the first inductor L1; the second end of the seventh capacitor C7 is connected to the second end of the first capacitor C1.

[0079] Specifically, when the boost unit 121 is powered on, the second diode D12 shunts the input direct current to avoid the impact of the large current on the first diode D11 at the moment of power-on, thereby protecting the first diode D11. At the same time, the first diode D11 can also prevent the saturation current of the first inductor L1 and the second inductor L2 at the moment of power-on from impacting the boost switch unit 122. Exemplarily, the first diode D11 can be an ultra-fast recovery diode, and the second diode D12 can be a fast recovery diode.

[0080] Before the boost unit 121 boosts the input DC power, the first inductor L1, the second inductor L2, the sixth capacitor C6 and the seventh capacitor C7 are charged through the boost switch unit 122. When the boost unit 121 boosts the input DC power, the voltages stored in the first inductor L1, the second inductor L2, the sixth capacitor C6 and the seventh capacitor C7 are superimposed on each other, thereby boosting the input DC power.

[0081] In an optional embodiment of the present invention, the boost filter unit 123 includes at least one polarity capacitor.

[0082] On the basis of the above embodiments, the boost filter unit 123 includes: a first polarity capacitor CE1, a second polarity capacitor CE2, a third polarity capacitor CE3 and a fourth polarity capacitor CE4.

[0083] The first end of the first polarity capacitor CE1 is connected to the output end of the boost unit 121 ; the second end of the first polarity capacitor CE1 is grounded; the second polarity capacitor CE2 , the third polarity capacitor CE3 and the fourth polarity capacitor CE4 are all connected in parallel with the first polarity capacitor CE1 .

[0084] Specifically, the boost filter unit 123 stabilizes and filters the DC power output by the boost unit 121. The capacity and quantity of the polar capacitors in the boost filter unit 123 can be selected according to the requirements of actual application, and this embodiment does not limit this.

[0085] In an optional embodiment of the present utility model, the boost switch unit 122 includes: a first magnetic bead B1, a third MOS tube Q3, a second voltage regulator diode ZD2, a first resistive element Z1, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a twenty-third resistor R23, a twelfth capacitor C12 and a fifth diode D5.

[0086] One end of the first magnetic bead B1 is electrically connected to the boost unit 121, the other end of the first magnetic bead B1 is electrically connected to the drain of the third MOS tube Q3, the source of the third MOS tube Q3 is electrically connected to one end of the first resistive element Z1, and the other end of the first resistive element Z1 is electrically connected to the ground; the gate of the third MOS tube Q3 is electrically connected to one end of the twelfth resistor R12, the other end of the twelfth resistor R12 away from the third MOS tube Q3 is electrically connected to one end of the eleventh resistor R11, the other end of the eleventh resistor R11 is electrically connected to the anode of the fifth diode D5, and the cathode of the fifth diode D5 is electrically connected to the correction control module 140. one end of a thirteenth resistor R13 is electrically connected to the output end of the correction control module 140, the other end of the thirteenth resistor R13 is electrically connected to one end of a twelfth capacitor C12, and is electrically connected between the eleventh resistor R11 and the twelfth resistor R12, the other end of the twelfth capacitor C12 is electrically connected to the gate of the third MOS tube Q3; one end of a twenty-third resistor R23 and a cathode of the second zener diode ZD2 are electrically connected to the gate of the third MOS tube Q3, the other end of the twenty-third resistor R23 and an anode of the second zener diode ZD2 are electrically connected to the source of the third MOS tube Q3.

[0087] Exemplarily, the first resistive element Z1 includes at least one resistor. When the first resistive element Z1 has two or more resistors, the resistors are connected in parallel. For example, the first resistive element Z1 may include a fifteenth resistor R15, a sixteenth resistor R16 and a seventeenth resistor R17 connected in parallel.

[0088] In an optional embodiment of the present utility model, the current sampling unit 124 includes: a second resistive element Z2, a third resistive element Z3, a first capacitive element X1, an eighth capacitor C8, a fifth capacitor C5 and a fourteenth resistor R14. One end of the second resistive element Z2 is electrically connected to the boost switch unit 122, the other end of the second resistive element Z2 is electrically connected to one end of the third resistive element Z3, the other end of the third resistive element Z3 is electrically connected to one end of the first capacitive element X1, the other end of the first capacitive element X1 is electrically connected to the input end of the correction control module 140 through the fourteenth resistor R14, one end of the fifth capacitor C5 is electrically connected to the input end of the correction control module 140, the other end of the fifth capacitor C5 is electrically connected to the ground, and the eighth capacitor C8 is connected in parallel with the second resistive element Z2.

[0089] Exemplarily, the second resistive element Z2 includes at least one resistor; for example, the second resistive element Z2 may include an eighteenth resistor R18, a nineteenth resistor R19, and a twentieth resistor R20 connected in series, the end of the eighteenth resistor R18 facing away from the nineteenth resistor R19 is connected to the first magnetic bead B1, and the end of the twentieth resistor R20 facing away from the nineteenth resistor R19 is connected to the third resistive element Z3; the third resistive element Z3 includes at least one resistor, and the third resistive element Z3 may, for example, include a twenty-first resistor R21; the first capacitive element X1 includes at least one capacitor, for example, the first capacitive element X1 may include a ninth capacitor C9 and a tenth capacitor C10 connected in parallel.

[0090] Based on the above embodiments, optionally, continue to refer to Figure 6 , the correction control module 140 includes a control chip U1, a second capacitor C2, a fourth capacitor C4, a third capacitor C3 and a twenty-second resistor R22. The first end of the second capacitor C2 is connected to the power supply terminal VCC of the control chip U1, and the power supply terminal VCC of the control chip U1 is electrically connected to the output terminal of the switch module 110, and the second end of the second capacitor C2 is grounded; the first end of the twenty-second resistor R22 is connected to the comparison terminal CMP of the control chip U1; the second end of the twenty-second resistor R22 is connected to the first end of the fourth capacitor C4; the second end of the fourth capacitor C4 is grounded; the first end of the third capacitor C3 is connected to the first end of the twenty-second resistor R22; the second end of the third capacitor C3 is grounded; the current input terminal CS of the control chip U1 is used as the input terminal of the correction control module 140140 and is electrically connected to the current sampling unit 124; the driving terminal DRV of the control chip U1 is connected to the control terminal of the boost switch unit 122; the signal feedback terminal VFB of the control chip U1 is connected to the output terminal of the voltage sampling module 130, and the ground terminal GND of the control chip U1 is grounded.

[0091] Specifically, the boost switch unit 122 controls the charge and discharge of the first inductor L1, the second inductor L2, the sixth capacitor C6, and the seventh capacitor C7 through the third MOS tube Q3. When the third MOS tube Q3 is turned on, the first inductor L1 and the second inductor L2 are charged; when the third MOS tube Q3 is turned off, the stored voltages of the first inductor L1, the second inductor L2, the sixth capacitor C6, and the seventh capacitor C7 are superimposed on each other, thereby boosting the input DC power.

[0092] The correction control module 140 controls the conduction of the third MOS tube Q3 through the thirteenth resistor R13, that is, the thirteenth resistor R13 constitutes a driving circuit of the third MOS tube Q3; when the third MOS tube Q3 is turned off, the discharge current flows back to the correction control module 140 through the eleventh resistor R11 and the fifth diode D5, that is, the eleventh resistor R11 and the fifth diode D5 constitute a discharge circuit of the third MOS tube Q3. The setting of the discharge circuit in the boost switch unit 122 is conducive to preventing the third MOS tube Q3 from being broken down.

[0093] In this embodiment, the first control signal is specifically a high level, and the second control signal is specifically a low level. Since the power supply terminal VCC of the control chip U1 is electrically connected to the output terminal of the switch module 110, when the main control module 100 outputs a high level, the base of the first transistor Q1 of the switch module 110 is a high level, so that the first transistor Q1 is turned on, and the first transistor Q1 outputs a turn-on signal through the collector. At this time, the power supply terminal VCC of the control chip U1 receives the turn-on signal and starts working; when the main control module 100 outputs a low level, the base of the first transistor Q1 of the switch module 110 is a low level, so that the first transistor Q1 is turned off, and the first transistor Q1 outputs a turn-off signal through the collector. At this time, the power supply terminal VCC of the control chip U1 receives the turn-off signal and stops working.

[0094] In an optional embodiment of the present utility model, as Figure 5 and Figure 6 As shown, the power factor correction circuit also includes a rectifier module 160, the output end of the rectifier module 160 is electrically connected to the power end of the correction main module 120, and the rectifier module 160 is used to convert AC power into DC power; in actual application, AC mains is usually used as the power supply, and through the rectifier module 160, AC power can be converted into DC power to power the correction main module 120.

[0095] In an optional embodiment of the present invention, the power factor correction circuit further includes an EMC filter module 170, which is used to suppress electromagnetic interference of the AC power, and the EMC filter module 170 is electrically connected between the AC power supply providing the AC power and the rectifier module 160. The AC power supply can specifically be a mains supply.

[0096] In an optional embodiment of the present invention, the rectifier module 160 includes a rectifier bridge. The main function of the rectifier bridge is to convert AC power into DC power. By making the rectifier module 160 include a rectifier bridge, AC power can be easily converted into DC power.

[0097] In an optional embodiment of the utility model, the number of rectifier bridges is two, namely, the first rectifier bridge BD1 and the second rectifier bridge BD2. The first AC end AC1 and the second AC end AC2 of the first rectifier bridge BD1 are electrically connected to the first output end of the EMC filter module 170; the first AC end AC1 and the second AC end AC2 of the second rectifier bridge BD2 are electrically connected to the second output end of the EMC filter module 170; the positive terminal V+ of the first rectifier bridge BD1 and the positive terminal V+ of the second rectifier bridge BD2 are electrically connected to the power supply end of the correction main module 120; the negative terminal V- of the first rectifier bridge BD1 and the negative terminal V- of the second rectifier bridge BD2 are electrically connected to the ground, so that the AC power passing through the EMC filter module 170 will be converted into DC power through the first rectifier bridge BD1 and the second rectifier bridge BD2 to power the correction main module 120. It can be understood that in other embodiments, the number of rectifier bridges can also be other numbers, which is not specifically limited here, but is just an example.

[0098] In an optional embodiment of the present invention, the EMC filter module 170 includes an EMC filter. The EMC filter (electromagnetic compatibility filter) is an electronic device used to suppress and eliminate strong electromagnetic interference and electric spark interference in the industrial automation system field, so it can suppress electromagnetic interference of alternating current.

[0099] Based on the above embodiment, the number of EMC filters is two, namely, the first EMC filter LF1 and the second EMC filter LF2, and the first EMC filter LF1 and the second EMC filter LF2 are connected in series between the AC power supply and the rectifier module 160. It can be understood that in other embodiments, the number of rectifier bridges can also be other numbers, which is not specifically limited here, but is only an example.

[0100] In an optional embodiment of the present utility model, the EMC filter module 170 also includes a fuse F1, a first thermistor NTC1, a second thermistor F2, a varistor MOV1, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, a second filter capacitor CX1, a first bypass capacitor CY1 and a second bypass capacitor CY2.

[0101] One end of the fuse F1 is connected to the live wire L of the AC power supply; the other end of the fuse F1 is connected to one end of the varistor MOV1; one end of the first thermistor NTC1 is connected to the neutral wire N of the AC power supply; one end of the varistor MOV1 facing away from the fuse F1 is connected to one end of the second thermistor F2, and one end of the second thermistor F2 facing away from the varistor MOV1 is connected to one end of the first thermistor NTC1 facing away from the neutral wire N of the AC power supply.

[0102] The first EMC filter LF1 includes a first filter inductor and a second filter inductor, and the second EMC filter LF2 includes a third filter inductor and a fourth filter inductor. The first end of the first filter inductor is electrically connected between the fuse F1 and the varistor MOV1, the second end of the first filter inductor is electrically connected to the first end of the third filter inductor, and the second end of the third filter inductor is electrically connected to the rectifier module 160 as the first output end of the EMC filter module 170; the first end of the second filter inductor is electrically connected between the first thermistor NTC1 and the second thermistor F2, the second end of the second filter inductor is electrically connected to the first end of the fourth filter inductor, and the second end of the fourth filter inductor is electrically connected to the rectifier module 160 as the second output end of the EMC filter module 170.

[0103] One end of the fourteenth resistor R14 is electrically connected between the second end of the first filter inductor and the first end of the third filter inductor, the other end of the fourteenth resistor R14 is electrically connected to the fifteenth resistor R15, and the end of the fifteenth resistor R15 away from the fourteenth resistor R14 is electrically connected between the second end of the second filter inductor and the first end of the fourth filter inductor. One end of the sixteenth resistor R16 is electrically connected between the second end of the first filter inductor and the first end of the third filter inductor, the other end of the sixteenth resistor R16 is electrically connected to one end of the seventeenth resistor R17, and the end of the seventeenth resistor R17 away from the sixteenth resistor R16 is electrically connected between the second end of the second filter inductor and the first end of the fourth filter inductor. The connection point of the fourteenth resistor R14 and the fifteenth resistor R15 is electrically connected to the connection point of the sixteenth resistor R16 and the seventeenth resistor R17. One end of the second filter capacitor CX1 is electrically connected between the second end of the first filter inductor and the first end of the third filter inductor, and the other end of the second filter capacitor CX1 is electrically connected between the second end of the second filter inductor and the first end of the fourth filter inductor.

[0104] The present utility model embodiment also provides a power supply device, including the power factor correction circuit of any embodiment of the present utility model. The power supply device provided by the present utility model embodiment has the beneficial effects of the power factor correction circuit provided by any of the above embodiments, which will not be repeated here. In some embodiments, the power supply device includes one or more of a power strip, a mobile power supply or a charger.

[0105] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0106] The above specific implementations do not constitute a limitation on the protection scope of the present utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A power factor correction circuit, characterized in that: It includes a correction main module, a voltage sampling module and a main control module; The main correction module is used to correct the power factor; The voltage sampling module is electrically connected to the correction main module, and the voltage sampling module is used to sample the correction main module to generate a sampling voltage; The input end of the main control module is electrically connected to the correction main module, and the output end of the main control module is electrically connected to the voltage sampling module. The main control module is used to output a first control signal or a second control signal according to the power of the correction main module, and the voltage sampling module is used to start sampling based on the first control signal and stop sampling based on the second control signal.

2. The power factor correction circuit according to claim 1, characterized in that: The power factor correction circuit also includes a switch module, and the switch module is electrically connected between the main control module and the voltage sampling module; The switch module is turned on based on the first control signal, and is turned off based on the second control signal; The voltage sampling module is used to start sampling when the switch module is turned on, and stop sampling when the switch module is turned off.

3. The power factor correction circuit according to claim 2, characterized in that: The voltage sampling module includes a voltage dividing unit and a first switch unit, wherein the first switch unit is connected in series with the voltage dividing unit; The switch module is used to output a turn-on signal when turned on, and to output a turn-off signal when turned off; The control end of the first switch unit is electrically connected to the switch module, and the first switch unit is used to be turned on based on the turn-on signal and turned off based on the turn-off signal.

4. The power factor correction circuit according to claim 3, characterized in that: The switch module includes a first transistor, a first resistor and a first capacitor; The collector of the first transistor is electrically connected to the power supply, the emitter of the first transistor is electrically connected to the voltage sampling module as the output end of the switch module, and the base of the first transistor is electrically connected to the main control module; One end of the first resistor is electrically connected to the base of the first transistor, and the other end of the first resistor is electrically connected to the emitter of the first transistor; One end of the first capacitor is electrically connected to the collector of the first transistor, and the other end of the first capacitor is electrically connected to the ground; And / or, the voltage dividing unit includes an upper voltage dividing subunit and a lower voltage dividing subunit, and the voltage sampling module further includes a sampling filtering unit; The first switch unit is connected in series between the upper voltage dividing subunit and the lower voltage dividing subunit; One end of the upper voltage dividing subunit away from the first switch unit is electrically connected to the correction main module; The sampling and filtering unit is connected in parallel with the lower voltage dividing subunit.

5. The power factor correction circuit according to any one of claims 2 to 4, characterized in that: The power factor correction circuit further includes an isolation module, which is electrically connected between the switch module and the main control module and is used to isolate the switch module from the main control module.

6. The power factor correction circuit according to claim 5, characterized in that: The isolation module comprises a photoelectric coupler, the light-emitting side of the photoelectric coupler is electrically connected to the main control module, and the light-receiving side of the photoelectric coupler is electrically connected to the switch module.

7. The power factor correction circuit according to any one of claims 1 to 4, characterized in that: The power factor correction circuit also includes a correction control module; The input end of the correction control module is electrically connected to the correction main module, the output end of the correction control module is electrically connected to the voltage sampling module, and the correction control module is used to control the correction main module to correct the power factor according to the sampled voltage; The main control module is electrically connected to the correction control module, and the correction control module is used to work based on the first control signal and stop working based on the second control signal.

8. The power factor correction circuit according to claim 7, characterized in that: The correction main module includes a boost unit, a boost switch unit, a current sampling unit and a boost filter unit; The input end of the boost unit is used to receive direct current, and the boost unit is used to boost the direct current; The output end of the boost unit is electrically connected to the boost filter unit and the voltage sampling module, and the boost filter unit is used to filter the output voltage of the boost unit; The control end of the boost unit is connected to the first end of the boost switch unit, the second end of the boost switch unit is electrically connected to the first end of the current sampling unit, the control end of the boost switch unit is connected to the output end of the correction control module, and the boost switch unit is used to control the working state of the boost unit; The second end of the current sampling unit is connected to the third end of the boost switch unit, the third end of the current sampling unit is connected to the input end of the correction control module, and the current sampling unit is used to collect the current of the boost unit to generate a sampling current.

9. The power factor correction circuit according to claim 8, characterized in that: The boost unit includes a first inductor, a second inductor, a first diode, a second diode, a first capacitor and a second capacitor; The first end of the first inductor is connected to direct current; the second end of the first inductor is connected to the first end of the second inductor; the second end of the second inductor is connected to the anode end of the first diode; the cathode end of the first diode is connected to the boost filter unit; the anode end of the second diode is connected to the second end of the first inductor; the cathode end of the second diode is connected to the cathode end of the first diode; the first end of the first capacitor is connected to the first end of the first inductor; the second end of the first capacitor is grounded; the first end of the second capacitor is connected to the second end of the first inductor; the second end of the second capacitor is connected to the second end of the first capacitor; And / or, the boost switch unit includes: a first magnetic bead, a third MOS tube, a second voltage regulator diode, a first resistive element, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a twenty-third resistor, a twelfth capacitor and a fifth diode; One end of the first magnetic bead is electrically connected to the boost unit, the other end of the first magnetic bead is electrically connected to the drain of the third MOS tube, the source of the third MOS tube is electrically connected to one end of the first resistive element, and the other end of the first resistive element is electrically connected to the ground; the gate of the third MOS tube is electrically connected to one end of the twelfth resistor, the other end of the twelfth resistor away from the third MOS tube is electrically connected to one end of the eleventh resistor, the other end of the eleventh resistor is electrically connected to the anode of the fifth diode, and the cathode of the fifth diode is electrically connected to the output end of the correction control module; one end of the thirteenth resistor is electrically connected to the output end of the correction control module, the other end of the thirteenth resistor is electrically connected to one end of the twelfth capacitor, and is electrically connected between the eleventh resistor and the twelfth resistor, and the other end of the twelfth capacitor is electrically connected to the gate of the third MOS tube; one end of the twenty-third resistor and the cathode of the second voltage stabilizing diode are both electrically connected to the gate of the third MOS tube, and the other end of the twenty-third resistor and the anode of the second voltage stabilizing diode are both electrically connected to the source of the third MOS tube; And / or, the current sampling unit includes: a second resistive element, a third resistive element, a first capacitive element, an eighth capacitor, a fifth capacitor and a fourteenth resistor; One end of the second resistive element is electrically connected to the boost switch unit, the other end of the second resistive element is electrically connected to one end of the third resistive element, the other end of the third resistive element is electrically connected to one end of the first capacitive element, the other end of the first capacitive element is electrically connected to the input end of the correction control module through the fourteenth resistor, one end of the fifth capacitor is electrically connected to the input end of the correction control module, the other end of the fifth capacitor is electrically connected to the ground, and the eighth capacitor is connected in parallel with the second resistive element.

10. The power factor correction circuit according to any one of claims 1 to 4, characterized in that: The power factor correction circuit further includes at least one of the following: A rectifier module, the output end of which is electrically connected to the power supply end of the correction main module, and the rectifier module is used to convert alternating current into direct current; The EMC filter module is used to suppress electromagnetic interference of alternating current.

11. A power supply device, characterized in that: Comprising a power factor correction circuit as described in any one of claims 1-10.

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