CN209767410U - Switching power supply and high power factor constant voltage output circuit - Google Patents

Switching power supply and high power factor constant voltage output circuit Download PDF

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Publication number
CN209767410U
CN209767410U CN201822118909.3U CN201822118909U CN209767410U CN 209767410 U CN209767410 U CN 209767410U CN 201822118909 U CN201822118909 U CN 201822118909U CN 209767410 U CN209767410 U CN 209767410U
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China
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circuit
power supply
output
current
switching power
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CN201822118909.3U
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Chinese (zh)
Inventor
王远
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Shenzhen Gongtong Electronics Co Ltd
Shenzhen Gongjin Electronics Co Ltd
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Shenzhen Gongtong Electronics Co Ltd
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Abstract

The utility model is suitable for a circuit technology field provides a switching power supply and high power factor constant voltage output circuit, wherein, is provided with the circuit of filling in the millet to and, the electric current afterflow circuit that links to each other with the circuit of filling in the millet. Through the current follow current circuit, on one hand, the valley filling circuit can work in a full voltage section, so that the application is expanded, and on the other hand, the voltage ripple can be restrained, so that the output is constant voltage, and the application is further expanded.

Description

switching power supply and high power factor constant voltage output circuit
Technical Field
The utility model belongs to the technical field of the circuit, especially, relate to a switching power supply and high power factor constant voltage output circuit.
Background
In a conventional switching power supply, a passive power factor corrector circuit, i.e. a valley filling circuit, is usually used, and the role of the valley filling circuit is mainly to spread a current waveform after rectification and filtration of an alternating current mains from a narrow pulse to a waveform close to a sine wave, which is equivalent to filling a large part of valley point areas in the narrow pulse current waveform. Conventional valley-fill circuits can achieve higher Power Factor (PF) values, but they can only be applied to high voltage segments, such as: 200Vac-264Vac, and cannot be applied to the full voltage section; in addition, the output voltage ripple voltage can reach more than 10V, and the output voltage ripple voltage cannot be applied to circuits with high requirements on voltage, so that the application of the output voltage ripple voltage is limited.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of above-mentioned technical problem at least.
The technical scheme of the utility model is that:
A switching power supply, comprising:
A main control circuit, a starting circuit, an input filter rectifying circuit, a valley filling circuit, a current follow current circuit, an energy conversion circuit, an output rectifying circuit and a detection feedback circuit,
The starting circuit is connected between the input filter rectification circuit and the main control circuit, the valley filling circuit, the energy conversion circuit and the output rectification circuit are sequentially connected behind the input filter rectification circuit, the current follow current circuit is located between the input filter rectification circuit and the energy conversion circuit, and the detection feedback circuit is connected between the output rectification circuit and the main control circuit.
As a further improvement of the present technical solution, the current freewheeling circuit is located between the input filter rectification circuit and the valley filling circuit.
As a further improvement of the present technical solution, the current freewheeling circuit is located between the valley filling circuit and the energy conversion circuit.
As a further improvement of the present technical solution, the switching power supply further includes: a switch-off absorption circuit located between the valley-fill circuit and the energy conversion circuit.
as a further improvement of the present technical solution, the detection feedback circuit includes:
an output voltage detection circuit and a feedback circuit,
the output voltage detection circuit is connected between the output rectifying circuit and the feedback circuit.
As a further improvement of the present technical solution, the current freewheeling circuit includes an inductor.
The utility model discloses another technical scheme is:
A high power factor constant voltage output circuit comprising: the valley filling circuit comprises a valley filling circuit and a current follow current circuit connected with the valley filling circuit.
The utility model provides an among switching power supply and high power factor constant voltage output circuit, be provided with the circuit of filling in the millet to and, the electric current afterflow circuit that links to each other with the circuit of filling in the millet. Through the current follow current circuit, on one hand, the valley filling circuit can work in a full voltage section, so that the application is expanded, and on the other hand, the voltage ripple can be restrained, so that the output is constant voltage, and the application is further expanded.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
fig. 1 is a schematic circuit diagram of a switching power supply according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a switching power supply according to a second embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a switching power supply according to a third embodiment of the present invention;
Fig. 4 is a schematic circuit diagram of a switching power supply according to an 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 should be noted that the terms "disposed" and "connected" should be interpreted broadly, and may be, for example, directly disposed, installed, connected, or indirectly disposed and connected through intervening components and intervening structures.
In addition, in the embodiments of the present invention, if there are orientations or positional relationships indicated by "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc., based on the orientations or positional relationships shown in the drawings or the conventional placement state or use state, the description is only for convenience of description and simplification, but the indication or suggestion that the indicated structure, feature, device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The various features and embodiments described in the detailed description may be combined in any suitable manner, for example, different embodiments may be formed by combining different features/embodiments, and various combinations of features/embodiments are not separately described in order to avoid unnecessary repetition in the present disclosure.
The first embodiment is as follows:
as shown in fig. 1, the present embodiment provides a switching power supply including:
A main control circuit 101, a start circuit 102, an input filter rectification circuit 103, a high power factor constant voltage output circuit 104, and a detection feedback circuit 105, wherein the high power factor constant voltage output circuit 104 includes: a valley-fill circuit 1041, a current flywheel circuit 1042, an energy conversion circuit 1043, and an output rectification circuit 1044.
The high power factor constant voltage output circuit 104 is connected after the input filter rectification circuit 103, the start circuit 102 is connected between the input filter rectification circuit 103 and the main control circuit 101, the valley filling circuit 1041, the energy conversion circuit 1043 and the output rectification circuit 1044 are sequentially connected after the input filter rectification circuit 103, the current follow current circuit 1042 is located between the input filter rectification circuit 103 and the energy conversion circuit 1043, and the detection feedback circuit 105 is connected between the output rectification circuit 1044 and the main control circuit 101.
the main control circuit 101 is used for controlling the whole switching power supply to work and can provide a corresponding power supply terminal VDD, a ground terminal GND, a feedback terminal FB and the like.
the start-up circuit 102 may be connected to a power supply terminal VDD of the main control circuit 101 and to a power supply point of the input filter and rectifier circuit 103 to take power from the input filter and rectifier circuit 103. The power supply point may be located before the rectifying circuit in the input filter rectifying circuit 103 or behind the rectifying circuit, and if the power supply point is located before the rectifying circuit, the customer requirement for standby power consumption may be met, and if the power supply point is located behind the rectifying circuit, the customer requirement for start time may be met. The start-up circuit 102 may include a gating circuit to select the power-up position of the power supply point.
The input filter rectifying circuit 103 is used for filtering and rectifying the input alternating current, and supplies power to the main control circuit 101 through the starting circuit 102.
The valley filling circuit 1041 can realize a higher PF value, and can spread the current waveform after the ac mains filtering and rectification from a narrow pulse to a waveform close to a sine wave.
The current freewheeling circuit 1042 can make the valley filling circuit 1041 work in the full voltage section and can restrain the voltage ripple, so that the output is a constant voltage, and the application is expanded.
the energy conversion circuit 1043 may change the ac voltage using a transformer so that the changed voltage meets the load requirement.
The output rectifying circuit 1044 can be used to convert ac into dc and output the dc to a load at the back end.
The detection feedback circuit 105 may collect the output voltage of the output rectification circuit 1044, and output the collected feedback signal to the main control circuit 101, so as to be used as a reference for the control action of the main control circuit 101.
In general, the detection feedback circuit 105 may include: an output voltage detection circuit 1051 and a feedback circuit 1052, wherein the output voltage detection circuit 1051 is connected between an output rectification circuit 1044 and the feedback circuit 1052.
In the embodiment, the valley filling circuit can work in a full voltage section and expand the application through the arranged current follow current circuit, and the voltage ripple can be restrained, so that the output is a constant voltage and the application is further expanded.
example two:
The embodiment further provides the following contents on the basis of the first embodiment:
As shown in fig. 1, the current flywheel circuit 1042 is located between the input filter rectification circuit 103 and the valley filling circuit 1041, or, as shown in fig. 2, the current flywheel circuit 1042 is located between the valley filling circuit 1041 and the energy conversion circuit 1043.
No matter which suitable position the current freewheeling circuit 1042 is located on the high power factor constant voltage output circuit 104, the valley filling circuit 1041 can operate in the full voltage section, and can also suppress the voltage ripple to make the output be a constant voltage.
Example three:
The embodiment further provides the following contents on the basis of the first embodiment or the second embodiment:
As shown in fig. 3, the switching power supply further includes: a switch between the valley fill circuit 1041 and the energy conversion circuit 1043 turns off the absorption circuit 1045.
the switch turn-off snubber circuit 1045 may be a resistor (R) capacitor (C) snubber circuit to improve the voltage and current waveforms experienced by the power electronic device at the turn-on and turn-off times, for example: limiting the circuit voltage rise rate to be too large.
In a specific application, as shown in fig. 4, in the circuit structure of the switching power supply, the current flywheel circuit 1042 may be an inductor or a branch consisting of an inductor and a diode. The main control circuit 101 adopts a chip model OB 2281A.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the present invention.

Claims (7)

1. a switching power supply, comprising:
A main control circuit, a starting circuit, an input filter rectifying circuit, a valley filling circuit, a current follow current circuit, an energy conversion circuit, an output rectifying circuit and a detection feedback circuit,
the starting circuit is connected between the input filter rectification circuit and the main control circuit, the valley filling circuit, the energy conversion circuit and the output rectification circuit are sequentially connected behind the input filter rectification circuit, the current follow current circuit is located between the input filter rectification circuit and the energy conversion circuit, and the detection feedback circuit is connected between the output rectification circuit and the main control circuit.
2. The switching power supply according to claim 1, wherein said current freewheeling circuit is located between said input filter rectification circuit and said valley fill circuit.
3. the switching power supply of claim 1 wherein said current freewheeling circuit is located between said valley-fill circuit and said energy conversion circuit.
4. The switching power supply according to claim 1, wherein the switching power supply further comprises: a switch-off absorption circuit located between the valley-fill circuit and the energy conversion circuit.
5. The switching power supply of claim 1, wherein the detection feedback circuit comprises:
an output voltage detection circuit and a feedback circuit,
The output voltage detection circuit is connected between the output rectifying circuit and the feedback circuit.
6. The switching power supply according to any one of claims 1 to 5, wherein the current freewheeling circuit comprises an inductor.
7. A high power factor constant voltage output circuit comprising the valley fill circuit, the current freewheel circuit, the energy conversion circuit, and the output rectification circuit of claim 1.
CN201822118909.3U 2018-12-14 2018-12-14 Switching power supply and high power factor constant voltage output circuit Active CN209767410U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201822118909.3U CN209767410U (en) 2018-12-14 2018-12-14 Switching power supply and high power factor constant voltage output circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201822118909.3U CN209767410U (en) 2018-12-14 2018-12-14 Switching power supply and high power factor constant voltage output circuit

Publications (1)

Publication Number Publication Date
CN209767410U true CN209767410U (en) 2019-12-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201822118909.3U Active CN209767410U (en) 2018-12-14 2018-12-14 Switching power supply and high power factor constant voltage output circuit

Country Status (1)

Country Link
CN (1) CN209767410U (en)

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