CN206260106U - A kind of twin-stage PFC dimming driving circuits - Google Patents
A kind of twin-stage PFC dimming driving circuits Download PDFInfo
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- CN206260106U CN206260106U CN201621282269.4U CN201621282269U CN206260106U CN 206260106 U CN206260106 U CN 206260106U CN 201621282269 U CN201621282269 U CN 201621282269U CN 206260106 U CN206260106 U CN 206260106U
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- auxiliary circuit
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Abstract
A kind of twin-stage PFC dimming driving circuits, including light modulation driver IC circuits and constant current auxiliary circuit and power supply auxiliary circuit, the constant current auxiliary circuit include flyback auxiliary circuit;Power supply auxiliary circuit includes normal shock auxiliary circuit;The flyback auxiliary circuit includes the assists winding N3, resistance R20, resistance R21 of transformer T1;The normal shock auxiliary circuit includes the assists winding N4, diode D4, resistance R5, electric capacity C4 of transformer T1.The utility model causes that this dimming driving circuit can both be realized expanding the reference constant current of whole circuit in the case of keeping High Power Factor, output voltage change very greatly in the case of holding output current stabilization.Auxiliary switching power supply or linear voltage decreasing mu balanced circuit are saved, original efficiency is maintained production cost is reduced.
Description
Technical field
The utility model is related to a kind of twin-stage PFC dimming driving circuits.
Background technology
LED is able to quickly send out in recent years due to many merits such as environmental protection, long lifespan, photoelectric efficiency be high in every profession and trade application
Exhibition, the driving power supply of LED into the focus of attention, in theory, the service life of LED more than 100,000 hours, but in practical application
During, because design and the type of drive selection of driving power supply are improper, LED is easily damaged.
Tradition increases pfc circuit can to power supply, purpose be exactly in order to reduce the higher hamonic wave produced in power supply to power network and
The harmonic pollution of other electric equipments and interference, so as to improve the utilization rate to electric energy, can provide dynamic compensation, even if negative
When being loaded in dynamic change, it is also possible to possess more outstanding utilization rate of electrical, so as to lift power savings.
Fig. 1 and Fig. 2 are that PFC light modulations drive the auxiliary circuit for expanding reference constant current in the prior art.
What is had in traditional PFC dimming driving circuits uses the turn ratio for improving flyback assists winding to exporting winding, auxiliary
Winding is powered by one-level linear voltage decreasing mu balanced circuit to IC, it is ensured that during output low pressure, IC does not enter under-voltage protection, its shortcoming
It is:The loss of linear voltage decreasing mu balanced circuit is very big, reduces the efficiency of whole circuit, increases cost, as shown in Figure 1.
The whole circuit of use also having in traditional PFC dimming driving circuits increases by one group of auxiliary switching power supply and IC is powered,
It has the disadvantage:Circuit is complicated, increases cost, accordingly also reduces some efficiency, as shown in Figure 2.
Accordingly, it would be desirable to progressive one improves.
The content of the invention
The purpose of this utility model is to overcome the shortcomings of that above-mentioned prior art is present, and provides a kind of twin-stage PFC light modulations
Drive circuit, circuit is simple, do not increase cost, original efficiency can be kept, while expanding whole reference constant current.
What the purpose of this utility model was realized in:
A kind of twin-stage PFC dimming driving circuits, including dimming driving circuit and constant current auxiliary circuit and power supply auxiliary circuit,
It is characterized in that:The normal shock auxiliary circuit;
The flyback auxiliary circuit includes the assists winding N3, resistance R20, resistance R21 of transformer T1;
The normal shock auxiliary circuit includes the assists winding N4, diode D4, resistance R5, electric capacity C4 of transformer T1;
The assists winding N3 of the transformer T1 in turn connects with resistance R20, R21, the fvsns pin connection of processor U1
Between resistance R20 and R21;
The assists winding N4 of the transformer T1 is connected with the positive pole of diode D4, and negative pole and the resistance R5 of diode D4 connect
Connect, resistance R5 is connected with the vcc pin of processor U1, the pgnd pin of U1 are grounded after being connected with electric capacity C4 one end, and electric capacity C4's is another
End is connected between R5 and the vcc pin of processor.
The transformer T1 also includes armature winding N1, and the polarity of the assists winding N4 is identical with armature winding N1, institute
State assists winding N4 to be powered to light modulation driver IC circuits, assists winding N4 sets in proportion with the turn ratio of armature winding N1.
The utility model has the beneficial effect that:
By above-mentioned improved technical scheme so that this dimming driving circuit can both realize keeping the feelings of High Power Factor
Expand the reference constant current of whole circuit under condition, save auxiliary switching power supply or linear voltage decreasing mu balanced circuit, be produced into reducing
Originally original efficiency is maintained.
Brief description of the drawings
Fig. 1 is prior art linear voltage decreasing mu balanced circuit figure.
Fig. 2 is that prior art increases independent auxiliary switching power supply circuit diagram.
Fig. 3 is the circuit diagram of the example of the utility model one.
Specific embodiment
Below in conjunction with the accompanying drawings and example is further described to the utility model.
Referring to Fig. 3, a kind of twin-stage PFC dimming driving circuits, including dimming driving circuit and constant current auxiliary
Circuit and power supply auxiliary circuit, constant current auxiliary circuit include flyback auxiliary circuit, and power supply auxiliary includes that normal shock is aided in
Circuit.
Further, flyback auxiliary circuit includes the assists winding N3, resistance R20, resistance R21 of transformer T1.
Further, normal shock auxiliary circuit includes the assists winding N4, diode D4, resistance R5, electric capacity C4 of transformer T1.
Further, the assists winding N3 of transformer T1 in turn connects with resistance R20, R21, the fvsns of processor U1
Pin is connected and resistance R20 and R21 between;Flyback auxiliary circuit is used for the zero passage detection of driver and setting for output no-load voltage
It is fixed.
Further, the assists winding N4 of transformer T1 is connected with the positive pole of diode D4, negative pole and the electricity of diode D4
Resistance R5 connections, resistance R5 is connected with the vcc pin of processor U1, and the pgnd pin of U1 are grounded after being connected with electric capacity C4 one end, electric capacity C4
The other end be connected between R5 and the vcc pin of processor, circuit work when, the output voltage of PFC boost circuit is transformer
The input voltage of the armature winding N1 of T1, this voltage substantially constant.
Further, transformer T1 also polarity and armature winding N1 phases including armature winding N1, the assists winding N4
Together, assists winding N4 sets in proportion with the number of turn of armature winding N1, when circuit works, is powered to IC from assists winding N4, just
The voltage substantially constant of level winding N1, the voltage of corresponding N4 also substantially constant.No matter the height of output voltage, light modulation drives IC electricity
Road is all without entering under-voltage protection.
Further, assists winding N4 directly powers to light modulation driver IC circuits, and without extra element is increased, circuit is simple
It is single, overcome the shortcoming of traditional scheme complex circuit and efficiency reduction.
Above-described embodiment is preferred scheme of the present utility model, and the utility model can also have other embodiments, ability
The technical staff in domain can also make equivalent variations or replacement on the premise of without prejudice to the utility model spirit, these equivalent changes
Type or replacement are all contained in the scope set by the application claim.
Claims (3)
1. a kind of twin-stage PFC dimming driving circuits, including light modulation driver IC circuits and constant current auxiliary circuit, it is characterised in that:Institute
Stating constant current auxiliary circuit includes flyback auxiliary circuit and normal shock auxiliary circuit;
The flyback auxiliary circuit includes the assists winding N3, resistance R20, resistance R21 of transformer T1;
The normal shock auxiliary circuit includes the assists winding N4, diode D4, resistance R5, electric capacity C4, processor U1 of transformer T1;
The assists winding N3 of the transformer T1 in turn connects with resistance R20, R21, the connection of fvsns pin and the electricity of processor U1
Between resistance R20 and R21;
The assists winding N4 of the transformer T1 is connected with the positive pole of diode D4, and the negative pole of diode D4 is connected with resistance R5,
Resistance R5 is connected with the vcc pin of processor U1, and the pgnd pin of U1 are grounded after being connected with electric capacity C4 one end, and the other end of electric capacity C4 connects
It is connected between R5 and the vcc pin of processor.
2. twin-stage PFC dimming driving circuits according to claim 1, it is characterised in that:The transformer T1 also includes primary
Winding N1, the polarity of the assists winding N4 is identical with armature winding N1, the number of turn of assists winding N4 and armature winding N1 press than
Example setting.
3. twin-stage PFC dimming driving circuits according to any one of claim 1 or 2, it is characterised in that:The assists winding N4
Powered to light modulation driver IC circuits, the light modulation driver IC circuits are electrically connected with LED device.
Priority Applications (1)
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CN201621282269.4U CN206260106U (en) | 2016-11-25 | 2016-11-25 | A kind of twin-stage PFC dimming driving circuits |
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CN201621282269.4U CN206260106U (en) | 2016-11-25 | 2016-11-25 | A kind of twin-stage PFC dimming driving circuits |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018232587A1 (en) * | 2017-06-20 | 2018-12-27 | 凤冠电机(深圳)有限公司 | Dimming driving circuit and smart light control led device |
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2016
- 2016-11-25 CN CN201621282269.4U patent/CN206260106U/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2018232587A1 (en) * | 2017-06-20 | 2018-12-27 | 凤冠电机(深圳)有限公司 | Dimming driving circuit and smart light control led device |
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