CN220775653U - PFC control circuit, switching power supply circuit and charger - Google Patents
PFC control circuit, switching power supply circuit and charger Download PDFInfo
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- CN220775653U CN220775653U CN202322014827.5U CN202322014827U CN220775653U CN 220775653 U CN220775653 U CN 220775653U CN 202322014827 U CN202322014827 U CN 202322014827U CN 220775653 U CN220775653 U CN 220775653U
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- 239000003990 capacitor Substances 0.000 claims description 13
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a PFC control circuit, a switching power supply circuit and a charger, wherein the PFC control circuit is arranged between a PFC module and a power supply control chip and comprises a voltage detection module and a power supply control module; the first end of the power supply control module is connected with the power supply control chip, the second end of the power supply control module is connected with the PFC module, and the third end of the power supply control module is connected with the voltage detection module; the voltage detection module is connected with the feedback control end of the power control chip and is used for detecting a feedback voltage signal output by the power control chip. According to the PFC control circuit, the state of the output power of the circuit is judged by detecting the feedback voltage signal output by the power control chip, and the PFC module is controlled to be closed when the output power of the power supply is smaller or no load is carried out, so that the problem that no-load power is higher due to the fact that the PFC circuit is increased in no load is solved, and the power efficiency is improved.
Description
Technical Field
The utility model relates to the technical field of switching power supplies, in particular to a PFC control circuit, a switching power supply circuit and a charger.
Background
PFC (power factor correction) circuits are a type of circuit often used on switching power supply circuits, the PFC circuit being located after the rectifier bridge and before the filter circuit for improving the power factor and EMI index of the circuit. The automatic control device has the main function of keeping the output voltage constant and improving the power factor of the system by automatically controlling the input current of the power system. The power system can reduce the load of the power system on the power grid and the power supply, reduce the energy consumption and the electricity expense, and simultaneously reduce the pollution and the environmental impact. However, after the PFC circuit is added, when the switching power supply circuit is in no-load or light-load state, the PFC circuit still works, which increases the power consumption of the switching power supply circuit, resulting in higher power in no-load or light-load state.
Disclosure of Invention
The embodiment of the utility model provides a PFC control circuit, a switching power supply circuit and a charger, which are used for solving the problem that after the switching power supply circuit is added into a PFC module, the power is higher in no-load or light-load conditions.
The embodiment of the utility model provides a PFC control circuit, which is arranged between a PFC module and a power supply control chip and comprises a voltage detection module and a power supply control module;
the first end of the power supply control module is connected with the power supply control chip, the second end of the power supply control module is connected with the PFC module, and the third end of the power supply control module is connected with the voltage detection module;
the voltage detection module is connected with the feedback control end of the power control chip and is used for detecting a feedback voltage signal output by the power control chip and controlling the on-off of the power supply control module according to the feedback voltage signal so that the power control chip supplies power to the PFC module or does not supply power to the PFC module.
Preferably, the voltage detection module comprises a first voltage stabilizing tube, a first resistor and a second resistor;
the first resistor and the second resistor are connected in series between the feedback control end of the power supply control chip and the ground;
the detection end of the first voltage stabilizing tube is connected with a connecting node between the first resistor and the second resistor; the anode of the first voltage stabilizing tube is grounded; and the cathode of the first voltage stabilizing tube is connected with the third end of the power supply control module.
Preferably, the voltage detection module further comprises a second voltage stabilizing tube;
the first end of the second voltage stabilizing tube is connected with the feedback control end of the power supply control chip, and the second end of the second voltage stabilizing tube is connected with the first resistor.
Preferably, the voltage detection module further comprises a first capacitor;
the first end of the first capacitor is connected with the third end of the first voltage stabilizing tube, and the second end of the first capacitor is connected with a connecting node between the first resistor and the second resistor.
Preferably, the power supply control module comprises a control tube;
the first end of the control tube is connected with the power supply control chip, the second end of the control tube is connected with the PFC module, and the third end of the control tube is connected with the voltage detection module.
Preferably, the power supply control module further comprises a third resistor,
the first end of the third resistor is connected with the third end of the control tube, and the second end of the third resistor is connected with the voltage detection module.
The embodiment of the utility model also provides a switching power supply circuit which comprises a PFC module, a power supply control chip and any PFC control circuit;
the power supply end of the power supply control chip is connected with the first end of the power supply control module, and the power supply end of the PFC module is connected with the second end of the power supply control module;
and the feedback control end of the power supply control chip is connected with the voltage detection module and is used for outputting a feedback voltage signal to the voltage detection module.
Preferably, the switching power supply circuit further comprises a rectifying and filtering module, a transformer module and a feedback control module;
the input end of the rectifying and filtering module is connected with a mains supply input line and is used for rectifying and filtering the input mains supply and outputting a first direct current voltage signal;
the output end of the power supply control chip is connected with the transformer module and is used for outputting PWM signals and controlling the transformer module to carry out step-down processing on the first direct current voltage signals;
the input end of the transformer module is connected with the rectifying and filtering module and is used for carrying out step-down processing on the first direct-current voltage signal according to the PWM signal and outputting a second direct-current voltage signal;
the first end of the feedback control module is connected with the output end of the transformer module, and the second end of the feedback control module is connected with the feedback control end of the power control chip and used for controlling the power control chip to output a feedback voltage signal;
and the output end of the PFC module is connected with the rectifying and filtering module and is used for improving the power factor of the switching power supply circuit.
Preferably, the feedback control module comprises a control IC and an optocoupler unit;
the first end of the control IC is connected with the output end of the transformer module, the second end of the control IC is connected with the first end of the primary side of the optical coupler unit, and the second end of the primary side of the optical coupler unit is grounded;
the first end of the secondary side of the optical coupling unit is connected with the power supply control chip, and the second end of the secondary side of the optical coupling unit is grounded;
the control IC is used for controlling the optical coupler unit to be conducted according to the second direct-current voltage signal output by the transformer module, so that the potential of the feedback control end of the power supply control chip is increased, and a feedback voltage signal is input to the voltage detection module.
The embodiment of the utility model also provides a charger, which comprises an input interface, an output interface and the switching power supply circuit;
the first end of the input interface is used for being connected with a mains supply input line, and the second end of the input interface is connected with the rectifying and filtering module;
the first end of the output interface is connected with the output end of the transformer module, and the second end of the output interface is used for being connected with an external terminal and charging the external terminal according to the second direct-current voltage signal.
According to the PFC control circuit provided by the embodiment of the utility model, the state of the output power of the circuit can be judged by detecting the feedback voltage signal output by the power control chip, and the PFC module is controlled to be closed when the output power of the power supply is smaller or no load is carried out, so that the problem of high no-load power caused by the fact that the PFC circuit is increased by no load is solved, and the power efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments of the present utility model will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic circuit diagram of a PFC control circuit according to an embodiment of the present utility model;
fig. 2 is a schematic circuit diagram of a switching power supply circuit according to an embodiment of the utility model.
In the figure: 1. a PFC module; 2. a power supply control chip; 3. a voltage detection module; 4. a power supply control module; 5. a rectifying and filtering module; 6. a transformer module; 7. a feedback control module; 8. an input interface; 9. and an output interface.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be understood that the present utility model may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art. In the drawings, the dimensions and relative dimensions of layers and regions may be exaggerated for the same elements throughout for clarity.
It will be understood that when an element or layer is referred to as being "on" …, "" adjacent to "…," "connected to" or "coupled to" another element or layer, it can be directly on, adjacent to, connected to or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on" …, "" directly adjacent to "…," "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present utility model.
Spatially relative terms, such as "under …," "under …," "below," "under …," "above …," "above," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "under" or "beneath" other elements would then be oriented "on" the other elements or features. Thus, the exemplary terms "under …" and "under …" may include both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
In the following description, for the purpose of providing a thorough understanding of the present utility model, detailed structures and steps are presented in order to illustrate the technical solution presented by the present utility model. Preferred embodiments of the present utility model are described in detail below, however, the present utility model may have other embodiments in addition to these detailed descriptions.
The embodiment of the utility model provides a PFC control circuit, which is arranged between a PFC module 1 and a power supply control chip 2 and comprises a voltage detection module 3 and a power supply control module 4 as shown in figures 1 and 2; the first end of the power supply control module 4 is connected with the power supply control chip 2, the second end of the power supply control module 4 is connected with the PFC module 1, and the third end of the power supply control module 4 is connected with the voltage detection module 3; the voltage detection module 3 is connected with the feedback control end FB of the power control chip 2, and is configured to detect a feedback voltage signal output by the power control chip 2, and control on-off of the power supply control module 4 according to the feedback voltage signal, so that the power control chip 2 supplies power to the PFC module 1 or does not supply power.
The feedback voltage signal is a voltage signal output by the power control chip 2 according to the output power of the switching power supply circuit, and increases with the increase of the output power of the switching power supply circuit.
As an example, the PFC control circuit may be applied to a switching power supply circuit, and disposed between the PFC module 1 and the power supply control chip 2 in the switching power supply circuit. The PFC module 1 is used for improving the power factor and the EMI index of the circuit. The PFC control circuit comprises a voltage detection module 3 and a power supply control module 4, wherein a first end of the power supply control module 4 is connected with a power supply end FB_VCC of a power supply control chip, a second end of the power supply control module 4 is connected with the power supply end PFC_VCC of the PFC module, and a third end of the power supply control module 4 is connected with the voltage detection module 3. The voltage detection module 3 is connected to the feedback control end FB of the power control chip 2, and is configured to detect a feedback voltage signal output by the power control chip 2, where the feedback voltage signal is a voltage signal output by the power control chip 2 according to the output power of the switching power supply circuit, and increases with the increase of the output power of the switching power supply circuit. When the feedback voltage signal is larger than the preset voltage value, the power supply control module 4 is controlled to be turned on, so that the power supply control chip 2 supplies power to the PFC module 1, and the PFC module 1 works normally, otherwise, when the feedback voltage signal is detected not to be larger than the preset voltage value, the power supply control module 4 is controlled to be turned off, and then the PFC module 1 is turned off. The PFC control circuit can judge the output power state of the circuit by detecting the feedback voltage signal output by the power control chip 2, and controls to close the PFC module 1 when the output power of the power supply is smaller or no load is carried out, so that the problem of high no-load power caused by the fact that the PFC circuit is increased by no load is solved, and the power efficiency is improved.
In one embodiment, the voltage detection module 3 includes a first voltage regulator D1, a first resistor R1, and a second resistor R2; the first resistor R1 and the second resistor R2 are connected in series between the feedback control end FB of the power control chip 2 and the ground; the detection end of the first voltage stabilizing tube D1 is connected with a connecting node between the first resistor R1 and the second resistor R2; the anode of the first voltage stabilizing tube D1 is grounded; the cathode of the first voltage stabilizing tube D1 is connected with the third end of the power supply control module 4.
As an example, the voltage detection module 3 includes a first voltage regulator D1, a first resistor R1, and a second resistor R2, where the first voltage regulator D1 is a TL431 voltage regulator. The first resistor R1 and the second resistor R2 are connected in series between the feedback control end FB of the power control chip 2 and the ground, the detection end of the first voltage stabilizing tube D1 is connected with a connecting node between the first resistor R1 and the second resistor R2, the anode of the first voltage stabilizing tube D1 is grounded, the first resistor R1 and the second resistor R2 form a voltage dividing effect, and the voltage of the detection end of the first voltage stabilizing tube D1 is the same as the voltage of the two ends of the second resistor R2. When the feedback voltage signal output by the feedback control end FB of the power supply control chip 2 is larger than a preset voltage value, the voltage of the detection end of the first voltage stabilizing tube D1 reaches the opening voltage of the first voltage stabilizing tube D1, the first voltage stabilizing tube D1 is conducted to the ground, the cathode end of the first voltage stabilizing tube D1 is connected with the third end of the power supply control module 4, and when the first voltage stabilizing tube D1 is conducted, the third end of the power supply control module 4 is pulled down to the ground, so that the power supply control module 4 is opened.
In an embodiment, the voltage detection module 3 further includes a second voltage stabilizing tube D2; the first end of the second voltage stabilizing tube D2 is connected with the feedback control end FB of the power control chip 2, and the second end of the second voltage stabilizing tube D2 is connected with the first resistor R1.
As an example, the voltage detection module 3 further includes a second voltage stabilizing tube D2, where a cathode terminal of the second voltage stabilizing tube D2 is connected to the feedback control terminal FB of the power control chip 2, and an anode terminal of the second voltage stabilizing tube D2 is connected to the first resistor R1, and when the second voltage stabilizing tube D2 breaks down in a reverse direction, a terminal voltage is almost unchanged in a certain current range, and a voltage stabilizing characteristic is shown, so that the voltage stability can be maintained.
In an embodiment, the voltage detection module 3 further includes a first capacitor C1; the first end of the first capacitor C1 is connected with the third end of the first voltage stabilizing tube D1, and the second end of the first capacitor C1 is connected with a connecting node between the first resistor R1 and the second resistor R2.
As an example, the voltage detection module 3 further includes a first capacitor C1, where a first end of the first capacitor C1 is connected to a cathode end of the first voltage stabilizing tube D1, a second end of the first capacitor C1 is connected to a connection node between the first resistor R1 and the second resistor R2, and the first capacitor C1 is bridged between the cathode end and the detection end of the voltage stabilizing tube to form positive feedback, so as to keep the voltage stabilizing tube continuously turned on.
In one embodiment, the power control module 4 includes a control tube Q1; the first end of the control tube Q1 is connected with the power control chip 2, the second end of the control tube Q1 is connected with the PFC module 1, and the third end of the control tube Q1 is connected with the voltage detection module 3.
As an example, the power supply control module 4 includes a control tube Q1, where the control tube Q1 is preferably a PNP type triode, a collector of the triode is connected to a power supply terminal fb_vcc of the power supply control chip, an emitter of the triode is connected to the power supply terminal pfc_vcc of the PFC module, a base of the triode is connected to a cathode terminal of the first voltage regulator D1 in the voltage detection module 3, when a feedback voltage signal output by the feedback control terminal FB of the power supply control chip 2 is greater than a preset voltage value, the first voltage regulator D1 is turned on, and a base of the triode is pulled down to ground, and the triode is turned on, so that the power supply control chip 2 supplies power to the PFC module 1, and the PFC module 1 works normally.
In an embodiment, the power supply control module 4 further includes a third resistor R3, a first end of the third resistor R3 is connected to the third end of the control tube Q1, and a second end of the third resistor R3 is connected to the third end of the first voltage stabilizing tube D1.
As an example, the power supply control module 4 further includes a third resistor R3, where a first end of the third resistor R3 is connected to a third end of the control tube Q1, and a second end of the third resistor R3 is connected to a third end of the first voltage stabilizing tube D1, so as to perform a current limiting function, so that a base current of the triode is kept within a normal range.
The embodiment of the utility model also provides a switching power supply circuit which comprises a power supply control chip 2, a PFC module 1 and the PFC control circuit; the power supply end FB_VCC of the power supply control chip is connected with the first end of the power supply control module 4, and the power supply end PFC_VCC of the PFC module is connected with the second end of the power supply control module 4; the feedback control end FB of the power supply control chip 2 is connected with the voltage detection module 3 and is used for outputting a feedback voltage signal to the voltage detection module 3.
As an example, the switching power supply circuit includes the power supply control chip 2, the PFC module 1, and the PFC control circuit described above. The power control chip 2 is arranged on one side of a primary side of a transformer in the switching power supply circuit and is used for outputting PWM waves to control the output voltage of a secondary side of the transformer in the switching power supply circuit, and the feedback control end FB of the power control chip 2 outputs a feedback voltage signal to the voltage detection module 3 according to the output power of the secondary side of the transformer, wherein the magnitude of the feedback voltage signal increases along with the increase of the output power. When the feedback voltage signal output by the power control chip 2 is larger than the preset voltage value, the power supply control module 4 is turned on, so that the power control chip 2 supplies power to the PFC module 1, and the PFC module 1 works normally.
In an embodiment, the switching power supply circuit further comprises a rectifying and filtering module 5, a transformer module 6 and a feedback control module 7; the input end of the rectifying and filtering module 5 is connected with a mains supply input line and is used for rectifying and filtering the input mains supply and outputting a first direct current voltage signal; the output end of the power supply control chip 2 is connected with the transformer module 6 and is used for outputting PWM signals and controlling the transformer module 6 to carry out step-down processing on the first direct current voltage signals; the input end of the transformer module 6 is connected with the rectifying and filtering module 5 and is used for carrying out step-down processing on the first direct-current voltage signal according to the PWM signal and outputting a second direct-current voltage signal; the first end of the feedback control module 7 is connected with the output end of the transformer module 6, and the second end of the feedback control module 7 is connected with the feedback control end FB of the power control chip 2 and used for controlling the power control chip 2 to output a feedback voltage signal; the output end of the PFC module 1 is connected with the rectifying and filtering module 5 and is used for improving the power factor of the switching power supply circuit.
As an example, the switching power supply circuit further comprises a rectifying and filtering module 5, a transformer module 6 and a feedback control module 7. The input end of the rectifying and filtering module 5 is connected with a mains supply input line and is used for rectifying and filtering the input mains supply and outputting a first direct current voltage signal; the output end of the power supply control chip 2 is connected with the transformer module 6 and is used for outputting PWM signals and controlling the transformer module 6 to carry out step-down processing on the first direct current voltage signals; the input end of the transformer module 6 is connected with the rectifying and filtering module 5 and is used for carrying out step-down processing on the first direct-current voltage signal according to the PWM signal and outputting a second direct-current voltage signal; the first end of the feedback control module 7 is connected with the output end of the transformer module 6, and the second end of the feedback control module 7 is connected with the feedback control end FB of the power control chip 2 and used for controlling the power control chip 2 to output a feedback voltage signal; the output end of the PFC module 1 is connected with the rectifying and filtering module 5 and is used for improving the power factor of the switching power supply circuit. By adding the PFC control circuit in the switching power supply circuit, the state of the output power of the circuit can be judged by detecting the feedback voltage signal output by the power supply control chip 2, and the PFC module 1 is controlled to be closed when the output power of the power supply is smaller or no load is carried out, so that the problem of high no-load power caused by the fact that the PFC circuit is added in no load is solved, and the power efficiency is improved.
In an embodiment, the feedback control module 7 comprises a control IC and an optocoupler unit; the first end of the control IC is connected with the output end of the transformer module 6, the second end of the control IC is connected with the first end of the primary side of the optical coupler unit, and the second end of the primary side of the optical coupler unit is grounded; the first end of the secondary side of the optical coupling unit is connected with the power control chip 2, and the second end of the secondary side of the optical coupling unit is grounded; and the control IC is used for controlling the on of the optocoupler unit according to the second direct-current voltage signal output by the transformer module 6, so that the feedback control end FB of the power supply control chip 2 is increased in potential, and a feedback voltage signal is input to the voltage detection module 3.
As an example, the feedback control module 7 includes a control IC and an optocoupler unit. The first end of the control IC is connected to the output end of the transformer module 6, and is used for detecting a second dc voltage signal, and detecting the output power of the switching power supply circuit according to the second dc voltage signal, the second end of the control IC is connected to the first end of the primary side of the optocoupler unit, the second end of the primary side of the optocoupler unit is grounded, the first end of the secondary side of the optocoupler unit is connected to the power control chip 2, and the second end of the secondary side of the optocoupler unit is grounded. When the output power of the switching power supply circuit increases, the control IC controls the primary side of the optocoupler unit to be conducted, the secondary side of the optocoupler unit to be conducted, the FB potential of the feedback control end of the power supply control chip 2 increases along with the increase of the output power, a feedback voltage signal is input to the voltage detection module 3, when the feedback voltage signal increases to be larger than a preset voltage value, the power supply control module 4 is turned on, the power supply control chip 2 supplies power to the PFC module 1, and the PFC module 1 normally works, otherwise, when the output power of the switching power supply circuit is smaller, the feedback voltage signal generated by the secondary side of the optocoupler unit to be conducted is not larger than the preset voltage value, the power supply control module 4 is turned off, the PFC module 1 is turned off in no-load or light load, the problem that no-load power is higher due to the fact that the no-load power is increased by the PFC circuit is solved, and the power supply efficiency is improved.
The embodiment of the utility model also provides a charger which comprises an input interface 8, an output interface 9 and the switching power supply circuit; the first end of the input interface 8 is used for connecting a mains supply input line, and the second end of the input interface 8 is connected with the rectifying and filtering module 5; the first end of the output interface 9 is connected to the output end of the transformer module 6, and the second end of the output interface 9 is used for connecting an external terminal and charging the external terminal according to the second direct current voltage signal.
As an example, an input interface 8, an output interface 9, and the switching power supply circuit described above are included. The first end of the input interface 8 is connected with a mains supply input line, the second end of the input interface 8 is connected with the rectifying and filtering module 5, the output end of the first end transformer module 6 of the output interface 9 is connected, the second end of the output interface 9 is connected with an external terminal, and the external terminal is charged according to a second direct-current voltage signal. When the output power of the switching power supply circuit increases, the feedback control end FB potential of the power supply control chip 2 increases along with the increase of the output power, a feedback voltage signal is input to the voltage detection module 3, when the feedback voltage signal increases to be larger than a preset voltage value, the power supply control module 4 is turned on, the power supply control chip 2 supplies power to the PFC module 1, so that the PFC module 1 normally works when the power supply is in a high-power state, otherwise, when the output power of the switching power supply circuit is smaller, the feedback voltage signal is not larger than the preset voltage value, the power supply control module 4 is turned off, the PFC module 1 is turned off when no load or light load is realized, the problem that no-load power is higher due to the fact that the no-load power is increased by the PFC circuit is solved, and the power supply efficiency is improved.
The above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and are intended to be included in the scope of the present utility model.
Claims (10)
1. The PFC control circuit is arranged between the PFC module and the power supply control chip and is characterized by comprising a voltage detection module and a power supply control module;
the first end of the power supply control module is connected with the power supply control chip, the second end of the power supply control module is connected with the PFC module, and the third end of the power supply control module is connected with the voltage detection module;
the voltage detection module is connected with the feedback control end of the power control chip and is used for detecting a feedback voltage signal output by the power control chip and controlling the on-off of the power supply control module according to the feedback voltage signal so that the power control chip supplies power to the PFC module or does not supply power to the PFC module.
2. The PFC control circuit of claim 1 wherein the voltage detection module comprises a first regulator tube, a first resistor, and a second resistor;
the first resistor and the second resistor are connected in series between the feedback control end of the power supply control chip and the ground;
the detection end of the first voltage stabilizing tube is connected with a connecting node between the first resistor and the second resistor; the anode of the first voltage stabilizing tube is grounded; and the cathode of the first voltage stabilizing tube is connected with the third end of the power supply control module.
3. The PFC control circuit of claim 2 wherein the voltage detection module further comprises a second regulator tube;
the first end of the second voltage stabilizing tube is connected with the feedback control end of the power supply control chip, and the second end of the second voltage stabilizing tube is connected with the first resistor.
4. The PFC control circuit of claim 2 wherein the voltage detection module further comprises a first capacitor;
the first end of the first capacitor is connected with the third end of the first voltage stabilizing tube, and the second end of the first capacitor is connected with a connecting node between the first resistor and the second resistor.
5. The PFC control circuit of claim 2 wherein the power supply control module comprises a control tube;
the first end of the control tube is connected with the power supply control chip, the second end of the control tube is connected with the PFC module, and the third end of the control tube is connected with the voltage detection module.
6. The PFC control circuit of claim 5 wherein the power control module further comprises a third resistor,
the first end of the third resistor is connected with the third end of the control tube, and the second end of the third resistor is connected with the voltage detection module.
7. A switching power supply circuit comprising a PFC module, a power supply control chip and the PFC control circuit of any one of claims 1 to 6;
the power supply end of the power supply control chip is connected with the first end of the power supply control module, and the power supply end of the PFC module is connected with the second end of the power supply control module;
and the feedback control end of the power supply control chip is connected with the voltage detection module and is used for outputting a feedback voltage signal to the voltage detection module.
8. The switching power supply circuit of claim 7 further comprising a rectifying and filtering module, a transformer module, and a feedback control module;
the input end of the rectifying and filtering module is connected with a mains supply input line and is used for rectifying and filtering the input mains supply and outputting a first direct current voltage signal;
the output end of the power supply control chip is connected with the transformer module and is used for outputting PWM signals and controlling the transformer module to carry out step-down processing on the first direct current voltage signals;
the input end of the transformer module is connected with the rectifying and filtering module and is used for carrying out step-down processing on the first direct-current voltage signal according to the PWM signal and outputting a second direct-current voltage signal;
the first end of the feedback control module is connected with the output end of the transformer module, and the second end of the feedback control module is connected with the feedback control end of the power control chip and used for controlling the power control chip to output a feedback voltage signal;
and the output end of the PFC module is connected with the rectifying and filtering module and is used for improving the power factor of the switching power supply circuit.
9. The switching power supply circuit according to claim 8, wherein the feedback control module includes a control IC and an optocoupler unit;
the first end of the control IC is connected with the output end of the transformer module, the second end of the control IC is connected with the first end of the primary side of the optical coupler unit, and the second end of the primary side of the optical coupler unit is grounded;
the first end of the secondary side of the optical coupling unit is connected with the power supply control chip, and the second end of the secondary side of the optical coupling unit is grounded;
the control IC is used for controlling the optical coupler unit to be conducted according to the second direct-current voltage signal output by the transformer module, so that the potential of the feedback control end of the power supply control chip is increased, and a feedback voltage signal is input to the voltage detection module.
10. A charger comprising an input interface, an output interface and the switching power supply circuit of any one of claims 7-9;
the first end of the input interface is used for being connected with a mains supply input line, and the second end of the input interface is connected with the rectifying and filtering module;
the first end of the output interface is connected with the output end of the transformer module, and the second end of the output interface is used for being connected with an external terminal and charging the external terminal according to a second direct-current voltage signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322014827.5U CN220775653U (en) | 2023-07-28 | 2023-07-28 | PFC control circuit, switching power supply circuit and charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322014827.5U CN220775653U (en) | 2023-07-28 | 2023-07-28 | PFC control circuit, switching power supply circuit and charger |
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| Publication Number | Publication Date |
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| CN220775653U true CN220775653U (en) | 2024-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322014827.5U Active CN220775653U (en) | 2023-07-28 | 2023-07-28 | PFC control circuit, switching power supply circuit and charger |
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| Country | Link |
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| CN (1) | CN220775653U (en) |
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