CN206350198U - A kind of inexpensive circuit on Switching Power Supply secondary side feedback - Google Patents

A kind of inexpensive circuit on Switching Power Supply secondary side feedback Download PDF

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Publication number
CN206350198U
CN206350198U CN201621482587.5U CN201621482587U CN206350198U CN 206350198 U CN206350198 U CN 206350198U CN 201621482587 U CN201621482587 U CN 201621482587U CN 206350198 U CN206350198 U CN 206350198U
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Prior art keywords
circuit
resistor
voltage
resistance
photodiode
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CN201621482587.5U
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Chinese (zh)
Inventor
吕健超
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Guangdong Kennede Electronics Manufacturing Co Ltd
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Guangdong Kennede Electronics Manufacturing Co Ltd
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Abstract

The utility model discloses a kind of inexpensive circuit on Switching Power Supply secondary side feedback, including high frequency transformer, output current loop circuit and current rectifying and wave filtering circuit, also include mu balanced circuit and output electrochemical capacitor, mu balanced circuit includes 3rd resistor and voltage-regulator diode, output current loop circuit includes photodiode, first resistor and second resistance, one end of 3rd resistor is connected on current rectifying and wave filtering circuit and the other end is connected with the negative pole of voltage-regulator diode, the positive pole of voltage-regulator diode connects the positive pole of photodiode, the negative pole of photodiode connects the negative pole of output end of high frequency transformer, second resistance is in parallel after being connected with first resistor with photodiode.Structure setting of the present utility model rationally, can reduce the use of the electronic component of comparator, so as to simplify circuit, greatly reduce the cost of circuit, and stability in use is good and strong applicability.

Description

A kind of inexpensive circuit on Switching Power Supply secondary side feedback
Technical field
The utility model belongs to LED drive power technical field, and in particular to a kind of on Switching Power Supply secondary side feedback Inexpensive circuit.
Background technology
As LED illumination is more and more hotter, the LED drive power as LED life pillars is also more and more concerned, this kind of electricity The characteristics of source is maximum is constant current voltage limiting, moreover long-term work is in the state of fully loaded, higher to efficiency requirements;Some small-powers Light fixture, such as built-in bulb lamp, Down lamp, fluorescent lamp have the strict limitation of comparison again to the physical dimension of power supply, and then one A little topological structures are simple, and inexpensive flyback power supply obtains vast application.In order to simplify structure, in small-power and to electric current electricity Press in the not high lamp power of required precision, the secondary side feedback loop simplified has played effect in circuit cost is saved.
The content of the invention
The purpose of this utility model is to provide that a kind of structure setting is reasonable and stability in use is good on Switching Power Supply pair The inexpensive circuit of side feedback.
The technical scheme for realizing the utility model purpose is a kind of inexpensive circuit on Switching Power Supply secondary side feedback, bag High frequency transformer, output current loop circuit and current rectifying and wave filtering circuit are included, the current rectifying and wave filtering circuit is connected to high frequency transformer In output end, in addition to mu balanced circuit includes 3rd resistor and voltage-regulator diode, institute with electrochemical capacitor, the mu balanced circuit is exported Output current loop circuit is stated including photodiode, first resistor and second resistance, one end of the 3rd resistor is connected to whole Flow on filter circuit and the other end is connected with the negative pole of voltage-regulator diode, the positive pole of the voltage-regulator diode connects photosensitive two pole The positive pole of pipe, the negative pole of the photodiode connects the negative pole of output end of high frequency transformer, the second resistance and described first It is in parallel after resistant series with photodiode, one end of the output electrochemical capacitor is connected to current rectifying and wave filtering circuit and the 3rd electricity On the tie point of resistance, the other end is connected on the tie point of first resistor and second resistance.
The resistance value of the first resistor is much larger than the resistance value of second resistance.
The utility model has positive effect:Rationally, it is compared adopts structure setting of the present utility model in conventional art For the secondary side feedback circuit of the comparators such as TL431 or LM358, the use of the electronic component of comparator can be effectively reduced, So as to simplify circuit, the cost of circuit is greatly reduced, while this circuit is existing by 3rd resistor, voltage-regulator diode, optocoupler Photodiode in device, the output no-load voltage regulator circuit of second resistance composition, there is photosensitive in first resistor, optical coupler again Diode composition constant output current regulation loop, meets the constant current voltage limiting requirement of LED drive power, stability in use it is good and Strong applicability.
Brief description of the drawings
In order that content of the present utility model is more likely to be clearly understood, below according to specific embodiment and with reference to attached Figure, is described in further detail to the utility model, wherein:
Fig. 1 is electrical block diagram of the present utility model.
Embodiment
(Embodiment 1)
Fig. 1 shows a kind of embodiment of the present utility model, and wherein Fig. 1 is that circuit structure of the present utility model shows It is intended to.
See Fig. 1, a kind of inexpensive circuit on Switching Power Supply secondary side feedback, including high frequency transformer 1, output current ring Circuit 2 and current rectifying and wave filtering circuit 3, the current rectifying and wave filtering circuit 3 are connected in the output end of high frequency transformer 1, in addition to voltage stabilizing Circuit 4 and output electrochemical capacitor C2, the mu balanced circuit bag 4 include 3rd resistor R3 and voltage-regulator diode ZD1, the output current Loop circuit 2 includes photodiode PC1 (in the present embodiment, photodiode is the photodiode inside optical coupler), first Resistance R1 and second resistance R2, one end of the 3rd resistor R3 is connected on current rectifying and wave filtering circuit and the other end and the pole of voltage stabilizing two Pipe ZD1 negative pole is connected, the positive pole connection photodiode PC1 of voltage-regulator diode ZD1 positive pole, photosensitive two pole Pipe PC1 negative pole connects the negative pole of output end of high frequency transformer, the second resistance R2 connected with the first resistor R1 after with light Quick diode PC1 is in parallel, and one end of the output electrochemical capacitor C2 is connected to the connection of current rectifying and wave filtering circuit and 3rd resistor On point, the other end is connected on the tie point of first resistor and second resistance.
The resistance value of the first resistor is much larger than the resistance value of second resistance.
When LED is unloaded, in order to prevent output voltage too high, voltage-regulator diode ZD1 and R2, R3 branch road can carry out maximum Voltage-regulation, after output voltage is more than Vzd1, ZD1 is begun to turn on, and R2 voltages start to reach that PC1 is opened after PC1 conducting voltage Begin feedback, and power-supply controller of electric proceeds by regulation, reduces or stops conveying energy to secondary.
Realized during the action for loading LED by R1, it is assumed that the forward conduction voltage drop of optocoupler PC1 light emitting diode is 1.2V, then the arranges value of LED current be:
Iled=1.2V/R1+R2 R1 are typically much deeper than R2 so can be reduced to
Iled=1.2V/R1
Rationally, it compares the pair using comparators such as TL431 or LM358 in conventional art to structure setting of the present utility model For the feedback circuit of side, the use of the electronic component of comparator can be effectively reduced, so as to simplify circuit, electricity is greatly reduced The cost on road, while this circuit is existing by 3rd resistor, voltage-regulator diode, photodiode, second resistance composition in optical coupler Output no-load voltage regulator circuit, have in first resistor, optical coupler photodiode composition constant output current regulation again Loop, meets the constant current voltage limiting requirement of LED drive power, and stability in use is good and strong applicability.
Obviously, above-described embodiment of the present utility model is only intended to clearly illustrate the utility model example, and It is not the restriction to embodiment of the present utility model.For those of ordinary skill in the field, in described above On the basis of can also make other changes in different forms.There is no need and unable to give all embodiments It is exhaustive.And these belong to the obvious changes or variations that connotation of the present utility model extends out and still fall within this practicality New protection domain.

Claims (2)

1. a kind of inexpensive circuit on Switching Power Supply secondary side feedback, including high frequency transformer, output current loop circuit and whole Filter circuit is flowed, the current rectifying and wave filtering circuit is connected in the output end of high frequency transformer, it is characterised in that:Also include voltage stabilizing electricity Road and output electrochemical capacitor, the mu balanced circuit include 3rd resistor and voltage-regulator diode, and the output current loop circuit includes Photodiode, first resistor and second resistance, one end of the 3rd resistor are connected on current rectifying and wave filtering circuit and the other end It is connected with the negative pole of voltage-regulator diode, the positive pole of the voltage-regulator diode connects the positive pole of photodiode, described photosensitive two The negative pole of pole pipe connects the negative pole of output end of high frequency transformer, the second resistance connected with the first resistor after with photosensitive two pole Pipe is in parallel, and described one end for exporting electrochemical capacitor is connected on the tie point of current rectifying and wave filtering circuit and 3rd resistor, the other end On the tie point for being connected to first resistor and second resistance.
2. a kind of inexpensive circuit on Switching Power Supply secondary side feedback according to claim 1, it is characterised in that:It is described The resistance value of first resistor is much larger than the resistance value of second resistance.
CN201621482587.5U 2016-12-30 2016-12-30 A kind of inexpensive circuit on Switching Power Supply secondary side feedback Active CN206350198U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201621482587.5U CN206350198U (en) 2016-12-30 2016-12-30 A kind of inexpensive circuit on Switching Power Supply secondary side feedback

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201621482587.5U CN206350198U (en) 2016-12-30 2016-12-30 A kind of inexpensive circuit on Switching Power Supply secondary side feedback

Publications (1)

Publication Number Publication Date
CN206350198U true CN206350198U (en) 2017-07-21

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109412423A (en) * 2018-12-14 2019-03-01 中国电子科技集团公司第四十三研究所 It is a kind of list pulse width modulator Multiple isolated outputs circuit and isolation output method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109412423A (en) * 2018-12-14 2019-03-01 中国电子科技集团公司第四十三研究所 It is a kind of list pulse width modulator Multiple isolated outputs circuit and isolation output method

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