CN218482779U - Follower circuit, PFC circuit and switching power supply - Google Patents
Follower circuit, PFC circuit and switching power supply Download PDFInfo
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- CN218482779U CN218482779U CN202222139166.4U CN202222139166U CN218482779U CN 218482779 U CN218482779 U CN 218482779U CN 202222139166 U CN202222139166 U CN 202222139166U CN 218482779 U CN218482779 U CN 218482779U
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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
Abstract
The utility model relates to a following circuit, a PFC circuit and a switch power supply, wherein the following circuit comprises an input voltage detection module, a following control module and an output voltage feedback module; the input end of the input voltage detection module is connected with the input end of the PFC circuit, the output end of the input voltage detection module is connected with the control end of the following control module, the input end of the output voltage feedback module is connected with the output end of the PFC circuit, the output end of the output voltage feedback module and one end of the following control module are connected together to serve as the output end of the following circuit, and the grounding ends of the input voltage detection module, the output voltage feedback module and the following control module are all coupled to the ground; the input voltage detection module obtains a first voltage representing the input voltage of the PFC circuit, the output voltage feedback module collects an output voltage signal of the PFC circuit and generates a feedback voltage at the output end of the following circuit, and the following control module adjusts the feedback signal to follow the first voltage signal according to the first voltage. The utility model can effectively reduce the stress and loss of the PFC circuit power device.
Description
Technical Field
The utility model relates to a switching power supply field, in particular to following circuit, PFC circuit and switching power supply.
Background
The existing PFC circuit mostly adopts a BOOST BOOST topology circuit architecture, and can BOOST the input voltage to a fixed voltage value; in order to meet the power factor correction under the full-input working condition, the boosted voltage value is basically fixed at about 400V; when the input voltage is lower, the voltage difference between the input and the output is higher, great stress is generated on a power device of a PFC circuit, the loss of the device is increased, the efficiency of a product is reduced, and the conventional PFC following control circuit is influenced by the characteristics of a triode, the precision of the output voltage is poorer, and the reliability of the product is influenced
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides a follower circuit, a PFC circuit and a switching power supply, which at least partially overcome the deficiencies of the prior art.
As a first aspect of the present invention, there is provided an embodiment of a follower circuit as follows:
a follower circuit is applied to a PFC circuit, and the PFC circuit comprises: the PFC circuit comprises a main power topology and a PFC control chip module, wherein the PFC control chip module is used for adjusting the output voltage of the PFC circuit according to a feedback voltage; the follower circuit includes: the device comprises an input voltage detection module, a following control module and an output voltage feedback module; the input end of the input voltage detection module is used for connecting the input end of the PFC circuit, the output end of the input voltage detection module is connected with the control end of the following control module, the input end of the output voltage feedback module is used for connecting the output end of the PFC circuit, the output end of the output voltage feedback module and one end of the following control module are connected together to be used as the output end of the following circuit, and the grounding end of the input voltage detection module, the grounding end of the output voltage feedback module and the grounding end of the following control module are all coupled to the ground; the input voltage detection module is used for obtaining a first voltage signal representing the input voltage of the PFC circuit, the output voltage feedback module is used for collecting the output voltage signal of the PFC circuit and generating the feedback voltage at the output end of the following circuit, and the following control module is used for adjusting the feedback signal to change along with the first voltage signal according to the first voltage signal.
As a specific implementation manner of the input voltage detection module, the method includes: resistance R1 and resistance R2, resistance R1 one end is the input of input voltage detection module, the resistance R1 other end with resistance R2 one end links together and is regarded as the output of input voltage detection module, the resistance R2 other end is the earthing terminal of input voltage detection module.
Further, the input voltage detection module further includes a capacitor C1, one end of the capacitor C1 is connected to the output end of the input voltage detection module, and the other end of the capacitor C1 is coupled to the ground end of the input voltage detection module.
As a specific implementation manner of the following control module, the following control module includes a triode Q1 and a resistor R3, a base of the triode Q1 is a control end of the following control module, a collector of the triode Q1 is one end of the following control module, an emitter of the triode Q1 is connected to one end of the resistor R3, and the other end of the resistor R3 is a ground end of the following control module.
Further, the following control module further includes a diode D1, an anode of the diode D1 is coupled to the base of the transistor Q1, and a cathode of the diode D1 is connected to the ground terminal of the following control module.
As another kind of concrete implementation mode of following control module, including fortune U2, resistance R3, resistance R6, resistance R7, resistance R8 and MOS pipe Q1, the negative phase input end that U2 was put to fortune does follow control module's control end, the output that U2 was put to fortune is connected simultaneously resistance R6 one end with resistance R8 one end, the positive input end that U2 was put to fortune is connected simultaneously the resistance R6 other end with resistance R7 one end, the resistance R8 other end is connected MOS pipe Q1's grid, MOS pipe Q1's drain electrode does follow control module's one end, MOS pipe Q1's source electrode is connected resistance R3 one end, the resistance R7 other end with the resistance R3 other end links together and is the earthing terminal of following control module.
As a specific implementation manner of the output voltage feedback module, the output voltage feedback module includes a resistor R4 and a resistor R5, one end of the resistor R4 is an input end of the output voltage feedback module, the other end of the resistor R4 is connected with one end of the resistor R5 to serve as an output end of the output voltage feedback module, and the other end of the resistor R5 is a ground end of the output voltage feedback module.
A follower circuit is applied to a PFC circuit, and the PFC circuit comprises: the PFC circuit comprises a main power topology and a PFC control chip module, wherein the PFC control chip module is used for adjusting the output voltage of the PFC circuit according to a feedback voltage; the follower circuit includes: the device comprises an input voltage detection module, a following control module and an output voltage feedback module; the input end of the input voltage detection module is used for connecting the input end of the PFC circuit, the output end of the input voltage detection module is connected with the control end of the following control module, the input end of the output voltage feedback module is used for connecting the output end of the PFC circuit, the output end of the output voltage feedback module and one end of the following control module are connected together to be used as the output end of the following circuit, and the grounding end of the input voltage detection module, the grounding end of the output voltage feedback module and the grounding end of the following control module are all coupled to the ground; the input voltage detection module includes: the circuit comprises a resistor R1 and a resistor R2, wherein one end of the resistor R1 is an input end of the input voltage detection module, the other end of the resistor R1 is connected with one end of the resistor R2 to serve as an output end of the input voltage detection module, and the other end of the resistor R2 is a grounding end of the input voltage detection module; the following control module comprises a triode Q1 and a resistor R3, the base electrode of the triode Q1 is the control end of the following control module, the collector electrode of the triode Q1 is one end of the following control module, the emitter electrode of the triode Q1 is connected with one end of the resistor R3, and the other end of the resistor R3 is the grounding end of the following control module; the output voltage feedback module comprises a resistor R4 and a resistor R5, one end of the resistor R4 is the input end of the output voltage feedback module, the other end of the resistor R4 is connected with one end of the resistor R5 to serve as the output end of the output voltage feedback module, and the other end of the resistor R5 is the grounding end of the output voltage feedback module.
Further, the input voltage detection module further includes a capacitor C1, one end of the capacitor C1 is connected to the output end of the input voltage detection module, and the other end of the capacitor C1 is coupled to the ground end of the input voltage detection module.
Further, the following control module further comprises a diode D1, an anode of the diode D1 is connected to a base of the triode Q1 through the resistor R2, and a cathode of the diode D1 is connected to a ground terminal of the following control module.
A follower circuit applied to a PFC circuit, the PFC circuit comprising: the PFC control chip module is used for adjusting the output voltage of the PFC circuit according to the feedback voltage; the follower circuit includes: the device comprises an input voltage detection module, a following control module and an output voltage feedback module; the input end of the input voltage detection module is used for being connected with the input end of the PFC circuit, the output end of the input voltage detection module is connected with the control end of the following control module, the input end of the output voltage feedback module is used for being connected with the output end of the PFC circuit, the output end of the output voltage feedback module and one end of the following control module are connected together to serve as the output end of the following circuit, and the grounding end of the input voltage detection module, the grounding end of the output voltage feedback module and the grounding end of the following control module are all coupled to the ground; the input voltage detection module includes: the circuit comprises a resistor R1 and a resistor R2, wherein one end of the resistor R1 is an input end of the input voltage detection module, the other end of the resistor R1 is connected with one end of the resistor R2 to serve as an output end of the input voltage detection module, and the other end of the resistor R2 is a grounding end of the input voltage detection module; the following control module comprises an operational amplifier U2, a resistor R3, a resistor R6, a resistor R7, a resistor R8 and an MOS (metal oxide semiconductor) tube Q1, wherein a negative phase input end of the operational amplifier U2 is a control end of the following control module, an output end of the operational amplifier U2 is simultaneously connected with one end of the resistor R6 and one end of the resistor R8, a positive input end of the operational amplifier U2 is simultaneously connected with the other end of the resistor R6 and one end of the resistor R7, the other end of the resistor R8 is connected with a grid electrode of the MOS tube Q1, a drain electrode of the MOS tube Q1 is one end of the following control module, a source electrode of the MOS tube Q1 is connected with one end of the resistor R3, and the other end of the resistor R7 and the other end of the resistor R3 are connected together to form a grounding end of the following control module; the output voltage feedback module comprises a resistor R4 and a resistor R5, one end of the resistor R4 is the input end of the output voltage feedback module, the other end of the resistor R4 is connected with one end of the resistor R5 to serve as the output end of the output voltage feedback module, and the other end of the resistor R5 is the grounding end of the output voltage feedback module.
As a second aspect of the present invention, there is provided an embodiment of a PFC circuit as follows:
a PFC circuit comprising: in an embodiment of the main power topology, the PFC control chip module, and any of the follower circuits of the first aspect, the PFC control chip module is configured to adjust the output voltage of the PFC circuit according to the feedback voltage.
Preferably, the main power topology is a BOOST topology.
As a third aspect of the present invention, there is provided a switching power supply according to the following embodiments:
a switching power supply comprising an embodiment of the PFC circuit of any of the second aspects above.
The theory of operation of this application will combine specific embodiment to describe, and the no longer repeated description here compares with prior art, the utility model discloses following beneficial effect has:
(1) The method comprises the steps that a first voltage signal representing the input voltage of the PFC circuit is obtained through an input voltage detection module, a follow control module collects an output voltage signal of the PFC circuit and generates a feedback voltage at the output end of the follow circuit, the control module adjusts the feedback signal to change along with the first voltage signal according to the first voltage signal, and a PFC control chip module is enabled to accurately change along with the change of the input voltage all the time when adjusting the output voltage of the PFC circuit according to the feedback voltage, so that the stress and the loss of a power device of the PFC circuit are effectively reduced, the efficiency of the PFC circuit is improved, the control accuracy of the PFC output voltage is improved, and the circuit reliability is improved;
(2) The specific realization circuit structure of each module in the following circuit is simple, so that the input voltage following function can be realized at lower cost, and the output voltage of the PFC circuit can be accurately controlled.
Drawings
Fig. 1 is a schematic diagram of a specific implementation of a follower circuit according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of another specific implementation of the follower circuit according to the first embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It is to be noted that the terms "comprises" and "comprising," and any variations thereof, as used in the specification and claims of this application, are intended to cover non-exclusive inclusions, such as, for example, the inclusion of a list of elements or unit circuits is not necessarily limited to those elements or unit circuits expressly listed, but may include elements or unit circuits not expressly listed or inherent to such circuits.
In addition, the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It will be understood that when an element is referred to in the specification and claims as being "connected" or "coupled" to another element, it can be "directly connected" to the other element or "connected" to the other element through a third element; when an element is described as being "coupled" to another element, it means that a plurality of corresponding ports between the two objects form an organic connection, which is systematic.
First embodiment
The embodiment provides a follower circuit applied to a PFC circuit, where the PFC circuit includes: the PFC circuit comprises a main power topology and a PFC control chip module, wherein the PFC control chip module is used for adjusting the output voltage of the PFC circuit according to the feedback voltage.
The follower circuit of the present embodiment includes: the device comprises an input voltage detection module, a following control module and an output voltage feedback module; the input end of the input voltage detection module is used for being connected with the input end of the PFC circuit, the output end of the input voltage detection module is connected with the control end of the following control module, the input end of the output voltage feedback module is used for being connected with the output end of the PFC circuit, the output end of the output voltage feedback module and one end of the following control module are connected together to serve as the output end of the following circuit, and the grounding end of the input voltage detection module, the grounding end of the output voltage feedback module and the grounding end of the following control module are all coupled to the ground.
The input voltage detection module is used for obtaining a first voltage signal representing the input voltage of the PFC circuit, the output voltage feedback module is used for collecting the output voltage signal of the PFC circuit and generating feedback voltage at the output end of the following circuit, and the following control module is used for adjusting the feedback signal to change along with the first voltage signal according to the first voltage signal.
Fig. 1 is a schematic diagram of a specific implementation manner of the follower circuit according to the first embodiment of the present invention.
Wherein, input voltage detection module includes: resistance R1 and resistance R2, resistance R1 one end is the input of input voltage detection module, and the resistance R1 other end links together as the output of input voltage detection module with resistance R2 one end, and the resistance R2 other end is the earthing terminal of input voltage detection module.
Furthermore, the input voltage detection module further comprises a capacitor C1, one end of the capacitor C1 is connected to the output end of the input voltage detection module, and the other end of the capacitor C1 is coupled to the ground end of the input voltage detection module. The capacitor C1 is used for filtering the first voltage signal output by the input voltage detection module, so that high-frequency interference signals are filtered, and stable input sampling signals are provided for the following control module.
Wherein, follow control module and include triode Q1 and resistance R3, triode Q1's base is for following control module's control end, and triode Q1's collector is for following control module's one end, and triode Q1's projecting pole connecting resistance R3 one end, the resistance R3 other end is for following control module's earthing terminal.
Furthermore, the following control module further comprises a diode D1, an anode of the diode D1 is coupled to a base of the triode Q1, and a cathode of the diode D1 is connected to a ground terminal of the following control module. The effect of increasing the diode D1 lies in utilizing the high temperature characteristic of diode self conduction pressure drop, compensates the high temperature characteristic of triode magnification beta to guarantee the stability of triode Q1 amplification performance under high low temperature operating mode.
The output voltage feedback module comprises a resistor R4 and a resistor R5, one end of the resistor R4 is an input end of the output voltage feedback module, the other end of the resistor R4 and one end of the resistor R5 are connected together to serve as an output end of the output voltage feedback module, and the other end of the resistor R5 is a grounding end of the output voltage feedback module.
The circuit shown in fig. 1 operates as follows:
when the PFC circuit works, the input voltage of the PFC circuit is divided by serially connecting a resistor R1, a resistor R2 and a diode D1, and then filtered by a capacitor C1, the base current of a triode Q1 is changed in real time by the change of the input voltage, the triode Q1 works in a linear amplification state by setting the parameters of the resistor R1 and the resistor R2, the size of the current flowing in a resistor R3 can be changed in real time by the change of the base current of the triode Q1, so that the voltage (namely feedback voltage) of the output end of the follow-up circuit is changed, and the switching time of PFC power conversion is timely adjusted by a PFC control chip module according to the feedback voltage, so that the output voltage of the PFC circuit is adjusted, namely the output voltage of the PFC is changed along with the input voltage;
fig. 2 is the utility model discloses another kind of embodiment's of following circuit schematic diagram of first embodiment, with fig. 1 difference lie in wherein follow control module include that U2 is put to fortune, resistance R3, resistance R6, resistance R7, resistance R8 and MOS pipe Q1, U2's negative phase input end is put for following control module's control end to fortune, U2's output is put to fortune connecting resistance R6 one end and resistance R8 one end simultaneously, U2's positive input end is put to fortune connecting resistance R6 other end and resistance R7 one end simultaneously, MOS pipe Q1's grid is connected to the resistance R8 other end, MOS pipe Q1's drain electrode is for following control module's one end, MOS pipe Q1's source electrode connecting resistance R3 one end, the resistance R7 other end links together for following control module's earthing terminal with the resistance R3 other end.
The operating principle of the circuit shown in fig. 2 is different from that shown in fig. 1 in that a first voltage signal output by an input voltage detection module is amplified by an operational amplifier U2 and then controls a MOS transistor Q1 to be turned on, and by reasonably setting peripheral resistance parameters, when an output end voltage of the operational amplifier U2 drives the MOS transistor Q1 to be turned on, vds of the MOS transistor Q1 is ensured to be less than or equal to Vgs-Vth (Vds is a drain-source voltage of the MOS transistor Q1, and Vgs-Vth is a gate-on threshold voltage of the MOS transistor Q1), so that the MOS transistor Q1 always operates in a variable resistance region, a voltage change at an input end of the operational amplifier U2 is subjected to proportional operation and then outputs a changed voltage signal at an output end thereof, the change of the voltage signal changes a magnitude of a current flowing in a resistor R3 in real time and also enables a voltage (i.e., a feedback voltage) at an output end of a follower circuit to change, and a PFC control chip module timely adjusts a switching time of a PFC power conversion according to adjust an output voltage of the PFC circuit, i.e., the output voltage of the PFC changes with an input voltage.
In the embodiment, the first voltage signal representing the input voltage of the PFC circuit is obtained through the input voltage detection module, the follow control module collects the output voltage signal of the PFC circuit and generates the feedback voltage at the output end of the follow circuit, and the control module adjusts the feedback signal to change along with the first voltage signal according to the first voltage signal, so that the PFC control chip module can accurately change along with the input voltage change all the time when adjusting the output voltage of the PFC circuit according to the feedback voltage, thereby effectively reducing the stress and loss of a PFC circuit power device, improving the efficiency of the PFC circuit, improving the control precision of the PFC output voltage and the reliability of the circuit.
In addition, the specific implementation circuit structure of each module in the following circuit of the embodiment is simple, so that the input voltage following function can be implemented at low cost, and the output voltage of the PFC circuit is accurately controlled.
Second embodiment
The present embodiment provides a PFC circuit, including: in a specific implementation of the main power topology, the PFC control chip module, and the follower circuit in any of the first embodiments, the PFC control chip module is configured to adjust an output voltage of the PFC circuit according to a feedback voltage.
The scheme adopted by the main power topology is not limited, and the advantage of the embodiment is more obvious when the main power topology is a BOOST topology.
Third embodiment
This embodiment provides a switching power supply including the specific implementation of any one of the PFC circuits of the second embodiment.
The above description of the embodiments is only for the purpose of helping understanding the inventive concept of the present application, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made by those of ordinary skill in the art without departing from the principle of the present invention should be included in the protection scope of the present invention.
Claims (14)
1. A follower circuit is applied to a PFC circuit, and the PFC circuit comprises: the PFC control chip module is used for adjusting the output voltage of the PFC circuit according to the feedback voltage; the method is characterized in that:
the follower circuit includes: the device comprises an input voltage detection module, a following control module and an output voltage feedback module; the input end of the input voltage detection module is used for being connected with the input end of the PFC circuit, the output end of the input voltage detection module is connected with the control end of the following control module, the input end of the output voltage feedback module is used for being connected with the output end of the PFC circuit, the output end of the output voltage feedback module and one end of the following control module are connected together to serve as the output end of the following circuit, and the grounding end of the input voltage detection module, the grounding end of the output voltage feedback module and the grounding end of the following control module are all coupled to the ground;
the input voltage detection module is used for obtaining a first voltage signal representing the input voltage of the PFC circuit, the output voltage feedback module is used for collecting the output voltage signal of the PFC circuit and generating the feedback voltage at the output end of the following circuit, and the following control module is used for adjusting the feedback signal to follow the first voltage signal according to the first voltage signal.
2. The follower circuit according to claim 1, wherein the input voltage detection module comprises: resistance R1 and resistance R2, resistance R1 one end is the input of input voltage detection module, the resistance R1 other end with resistance R2 one end links together and is regarded as the output of input voltage detection module, the resistance R2 other end is the earthing terminal of input voltage detection module.
3. The follower circuit of claim 2, wherein the input voltage detection module further comprises a capacitor C1, one end of the capacitor C1 is connected to the output terminal of the input voltage detection module, and the other end of the capacitor C1 is coupled to the ground terminal of the input voltage detection module.
4. The follower circuit of claim 1, wherein the follower control module comprises a transistor Q1 and a resistor R3, a base of the transistor Q1 is a control terminal of the follower control module, a collector of the transistor Q1 is one terminal of the follower control module, an emitter of the transistor Q1 is connected to one terminal of the resistor R3, and another terminal of the resistor R3 is a ground terminal of the follower control module.
5. The follower circuit of claim 4, wherein the follower control module further comprises a diode D1, an anode of the diode D1 is coupled to the base of the transistor Q1, and a cathode of the diode D1 is connected to a ground terminal of the follower control module.
6. The follower circuit of claim 1, wherein the follower control module comprises an operational amplifier U2, a resistor R3, a resistor R6, a resistor R7, a resistor R8 and a MOS transistor Q1, a negative phase input end of the operational amplifier U2 is a control end of the follower control module, an output end of the operational amplifier U2 is connected to one end of the resistor R6 and one end of the resistor R8, a positive input end of the operational amplifier U2 is connected to the other end of the resistor R6 and one end of the resistor R7, the other end of the resistor R8 is connected to a gate of the MOS transistor Q1, a drain of the MOS transistor Q1 is one end of the follower control module, a source of the MOS transistor Q1 is connected to one end of the resistor R3, and the other end of the resistor R7 and the other end of the resistor R3 are connected together to be a ground end of the follower control module.
7. The follower circuit of claim 1, wherein the output voltage feedback module comprises a resistor R4 and a resistor R5, one end of the resistor R4 is an input end of the output voltage feedback module, the other end of the resistor R4 and one end of the resistor R5 are connected together to serve as an output end of the output voltage feedback module, and the other end of the resistor R5 is a ground end of the output voltage feedback module.
8. A follower circuit is applied to a PFC circuit, and the PFC circuit comprises: the PFC control chip module is used for adjusting the output voltage of the PFC circuit according to the feedback voltage; the method is characterized in that:
the follower circuit includes: the device comprises an input voltage detection module, a following control module and an output voltage feedback module; the input end of the input voltage detection module is used for being connected with the input end of the PFC circuit, the output end of the input voltage detection module is connected with the control end of the following control module, the input end of the output voltage feedback module is used for being connected with the output end of the PFC circuit, the output end of the output voltage feedback module and one end of the following control module are connected together to serve as the output end of the following circuit, and the grounding end of the input voltage detection module, the grounding end of the output voltage feedback module and the grounding end of the following control module are all coupled to the ground;
the input voltage detection module includes: the circuit comprises a resistor R1 and a resistor R2, wherein one end of the resistor R1 is an input end of the input voltage detection module, the other end of the resistor R1 is connected with one end of the resistor R2 to be used as an output end of the input voltage detection module, and the other end of the resistor R2 is a grounding end of the input voltage detection module;
the following control module comprises a triode Q1 and a resistor R3, the base electrode of the triode Q1 is the control end of the following control module, the collector electrode of the triode Q1 is one end of the following control module, the emitter electrode of the triode Q1 is connected with one end of the resistor R3, and the other end of the resistor R3 is the grounding end of the following control module;
the output voltage feedback module comprises a resistor R4 and a resistor R5, one end of the resistor R4 is the input end of the output voltage feedback module, the other end of the resistor R4 is connected with one end of the resistor R5 to serve as the output end of the output voltage feedback module, and the other end of the resistor R5 is the grounding end of the output voltage feedback module.
9. The follower circuit of claim 8, wherein: the input voltage detection module further comprises a capacitor C1, one end of the capacitor C1 is connected with the output end of the input voltage detection module, and the other end of the capacitor C1 is coupled with the grounding end of the input voltage detection module.
10. The follower circuit of claim 8 or 9, wherein: the following control module further comprises a diode D1, the anode of the diode D1 is connected with the base electrode of the triode Q1 through the resistor R2, and the cathode of the diode D1 is connected with the grounding end of the following control module.
11. A follower circuit is applied to a PFC circuit, and the PFC circuit comprises: the PFC control chip module is used for adjusting the output voltage of the PFC circuit according to the feedback voltage; the method is characterized in that:
the follower circuit includes: the device comprises an input voltage detection module, a following control module and an output voltage feedback module; the input end of the input voltage detection module is used for being connected with the input end of the PFC circuit, the output end of the input voltage detection module is connected with the control end of the following control module, the input end of the output voltage feedback module is used for being connected with the output end of the PFC circuit, the output end of the output voltage feedback module and one end of the following control module are connected together to serve as the output end of the following circuit, and the grounding end of the input voltage detection module, the grounding end of the output voltage feedback module and the grounding end of the following control module are all coupled to the ground;
the input voltage detection module includes: the circuit comprises a resistor R1 and a resistor R2, wherein one end of the resistor R1 is an input end of the input voltage detection module, the other end of the resistor R1 is connected with one end of the resistor R2 to be used as an output end of the input voltage detection module, and the other end of the resistor R2 is a grounding end of the input voltage detection module;
the following control module comprises an operational amplifier U2, a resistor R3, a resistor R6, a resistor R7, a resistor R8 and an MOS (metal oxide semiconductor) tube Q1, wherein the negative phase input end of the operational amplifier U2 is the control end of the following control module, the output end of the operational amplifier U2 is simultaneously connected with one end of the resistor R6 and one end of the resistor R8, the positive input end of the operational amplifier U2 is simultaneously connected with the other end of the resistor R6 and one end of the resistor R7, the other end of the resistor R8 is connected with the grid electrode of the MOS tube Q1, the drain electrode of the MOS tube Q1 is one end of the following control module, the source electrode of the MOS tube Q1 is connected with one end of the resistor R3, and the other end of the resistor R7 and the other end of the resistor R3 are connected together to form the grounding end of the following control module;
the output voltage feedback module comprises a resistor R4 and a resistor R5, one end of the resistor R4 is the input end of the output voltage feedback module, the other end of the resistor R4 is connected with one end of the resistor R5 to serve as the output end of the output voltage feedback module, and the other end of the resistor R5 is the grounding end of the output voltage feedback module.
12. A PFC circuit, comprising: a main power topology, a PFC control chip module and the follower circuit of any of claims 1 to 11, the PFC control chip module being configured to regulate an output voltage of the PFC circuit in dependence on the feedback voltage.
13. The PFC circuit of claim 12, wherein the main power topology is a BOOST topology.
14. A switching power supply comprising the PFC circuit of claim 12 or 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222139166.4U CN218482779U (en) | 2022-08-15 | 2022-08-15 | Follower circuit, PFC circuit and switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222139166.4U CN218482779U (en) | 2022-08-15 | 2022-08-15 | Follower circuit, PFC circuit and switching power supply |
Publications (1)
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|---|---|
| CN218482779U true CN218482779U (en) | 2023-02-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222139166.4U Active CN218482779U (en) | 2022-08-15 | 2022-08-15 | Follower circuit, PFC circuit and switching power supply |
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| Country | Link |
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| CN (1) | CN218482779U (en) |
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