CN206640832U - A kind of control circuit - Google Patents
A kind of control circuit Download PDFInfo
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- CN206640832U CN206640832U CN201720198695.8U CN201720198695U CN206640832U CN 206640832 U CN206640832 U CN 206640832U CN 201720198695 U CN201720198695 U CN 201720198695U CN 206640832 U CN206640832 U CN 206640832U
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- comparator
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Abstract
The utility model discloses a kind of control circuit, including comparator U1, the power end of the comparator U1 is connected with reference power supply, comparator U1 ground terminal ground connection, comparator U1 in-phase input end is connected by a reference voltage processing unit with reference power supply, comparator U1 inverting input is connected by an input bleeder circuit unit with mains electricity input end, comparator U1 output end is connected by a resistance R7 with metal-oxide-semiconductor Q3 grid, the source ground of the metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q3 drain electrode are connected by electric capacity C6 with the main control chip U2 of LED driver；This product utilizes CT functions, when inlet highway voltage is high, ON time or constant, the low principle of power factor (PF), by this control circuit, makes to change its ON time when busbar voltage is high to reach high power factor；It disclosure satisfy that the requirement that LED driver power factor (PF) in 90 305V input voltages reaches more than 0.9.
Description
Technical field
Low-voltage distribution technology is the utility model is related to, more particularly, to a kind of power factor (PF) control for applying to LED driver
Circuit processed.
Background technology
ON Semi chip NCL30000 are currently based on, using critical conduction mode（CrM）Flyback topologies structure, with single hop
Formula topological structure provides high power factor, and its fixation ON time generation is sinusoidal identical with input current phase, so as in circuit
Cycle maintains constant on-time, but because fixed turn on when using American industry lighting voltage 277V, power factor (PF) is low
In 0.9, it is impossible to meet Energy Star industrial lighting voltage 277V or it is higher when power factor (PF) be more than 0.9 requirement.
Utility model content
In view of the above-mentioned problems, the utility model provides a kind of control circuit, the control circuit disclosure satisfy that LED driver
Requirement of the power factor (PF) more than 0.9 can be met in 90-305V input voltages.
The utility model is that technical scheme is used by solving its technical problem：
A kind of control circuit, including comparator U1, the power end of the comparator U1 are connected with reference power supply, comparator U1
Ground terminal ground connection, it is characterised in that：The in-phase input end of the comparator U1 passes through a reference voltage processing unit and benchmark electricity
Source is connected, and comparator U1 inverting input is connected by an input bleeder circuit unit with mains electricity input end, comparator U1's
Output end is connected by a resistance R7 with metal-oxide-semiconductor Q3 grid, and the source ground of the metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q3 drain electrode passes through
One electric capacity C6 is connected with the main control chip U2 of LED driver.
Further, the reference voltage processing unit includes electric capacity C1, the resistance R1 and resistance R2 being connected in series, and parallel connection is even
Meet the voltage-regulator diode D1 and electric capacity C2 that latter end is grounded and the other end is connected with resistance R1 and resistance R2 connection end, resistance R1
The other end be connected with comparator U1 in-phase input end, the resistance R2 other end is connected with reference power supply, the comparator U1
In-phase input end be grounded by electric capacity C1.
Further, the input bleeder circuit unit includes diode D2, electric capacity C3 and C4, resistance R3, R4, R5 and R6,
The negative electrode of the diode D2 is connected with the inverting input of the comparator U1, and diode D2 anode is connected by resistance R6
To mains electricity input end, resistance R4 is connected in parallel on diode D2 both ends, and the inverting input of the comparator U1 also passes through electricity respectively
R3 and electric capacity C4 ground connection is hindered, the anode of the diode D2 is grounded by resistance R4 and electric capacity C3 respectively.
The beneficial effects of the utility model are：This control circuit is connected on the CT of LED driver control chip, is utilized
This CT function, when inlet highway voltage is high, ON time or constant, the low principle of power factor (PF), by this control circuit,
Make to change its ON time when busbar voltage is high to reach high power factor；This control circuit disclosure satisfy that LED driver in 90-
Power factor (PF) reaches more than 0.9 requirement during 305V input voltages.
Brief description of the drawings
, below will be to needed for embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
The accompanying drawing to be used is briefly described.Obviously, described accompanying drawing is part of the embodiment of the present utility model, rather than entirely
Portion's embodiment, those skilled in the art on the premise of not paying creative work, can also obtain according to these accompanying drawings
Other designs and accompanying drawing：
Fig. 1 is the utility model circuit theory diagrams；
Fig. 2 is to apply LED driver circuit schematic diagram of the present utility model.
Embodiment
Design, concrete structure and caused technique effect of the present utility model are carried out below with reference to embodiment and accompanying drawing
Clearly and completely describe, to be completely understood by the purpose of this utility model, feature and effect.Obviously, described embodiment
It is part of the embodiment of the present utility model, rather than whole embodiments, based on embodiment of the present utility model, the skill of this area
The other embodiment that art personnel are obtained on the premise of not paying creative work, belong to the model of the utility model protection
Enclose.
Referring to figs. 1 to Fig. 2, a kind of control circuit, including comparator U1, the power end and reference power supply of the comparator U1
It is connected, comparator U1 ground terminal ground connection, it is characterised in that：The in-phase input end of the comparator U1 is handled by a reference voltage
Unit is connected with reference power supply, and comparator U1 inverting input passes through an input bleeder circuit unit and mains electricity input end phase
Even, comparator U1 output end is connected by a resistance R7 with metal-oxide-semiconductor Q3 grid, the source ground of the metal-oxide-semiconductor Q3, MOS
Pipe Q3 drain electrode is connected by an electric capacity C6 with the main control chip U2 of LED driver CT pins.Using this CT function, work as input
When busbar voltage is high, ON time or constant, the low principle of power factor (PF), by this control circuit, when making busbar voltage high
Change its ON time to reach high power factor.
Further, the reference voltage processing unit includes electric capacity C1, the resistance R1 and resistance R2 being connected in series, and parallel connection is even
Meet the voltage-regulator diode D1 and electric capacity C2 that latter end is grounded and the other end is connected with resistance R1 and resistance R2 connection end, resistance R1
The other end be connected with comparator U1 in-phase input end, the resistance R2 other end is connected with reference power supply, the comparator U1
In-phase input end be grounded by electric capacity C1.
Further, the input bleeder circuit unit includes diode D2, electric capacity C3 and C4, resistance R3, R4, R5 and R6,
The negative electrode of the diode D2 is connected with the inverting input of the comparator U1, and diode D2 anode is connected by resistance R6
To mains electricity input end, resistance R4 is connected in parallel on diode D2 both ends, and the inverting input of the comparator U1 also passes through electricity respectively
R3 and electric capacity C4 ground connection is hindered, the anode of the diode D2 is grounded by resistance R4 and electric capacity C3 respectively.
Operation principle of the present utility model is：Reference voltage processing unit provides benchmark voltage to the same of comparator U1
To input, the line voltage of acquisition is inputed to comparator U1 inverting inputs and carries out voltage ratio by input bleeder circuit unit
Compared with when inputting line voltage height and being more than or equal to 277V, comparator U1 output ends are low level, and metal-oxide-semiconductor Q3 is not turned on, electric capacity C6
Disconnect, ON time is determined by C9, the comparator output terminal output high level when inputting line voltage and being less than 90V, Q3 conductings,
Make the increase of CT electric capacity, make it to meet power factor (PF) more than 0.9 in 90-305V input voltages.
Described above-described embodiment is that the above of the present utility model is further described, but should not be interpreted as this
The scope of the above-mentioned theme of the utility model is only limitted to above-described embodiment, all to belong to this reality based on the technology that the above is realized
With new scope.
Claims (3)
1. a kind of control circuit, including comparator U1, the power end of the comparator U1 are connected with reference power supply, comparator U1's
Ground terminal is grounded, it is characterised in that：The in-phase input end of the comparator U1 passes through a reference voltage processing unit and reference power supply
It is connected, comparator U1 inverting input is connected by an input bleeder circuit unit with mains electricity input end, and comparator U1's is defeated
Go out end by a resistance R7 with metal-oxide-semiconductor Q3 grid to be connected, the source ground of the metal-oxide-semiconductor Q3, metal-oxide-semiconductor Q3 drain electrode passes through one
Electric capacity C6 is connected with the main control chip U2 of LED driver.
A kind of 2. control circuit according to claim 1, it is characterised in that：The reference voltage processing unit includes electric capacity
C1, the resistance R1 and resistance R2 being connected in series, it is connected in parallel the connection of latter end ground connection and the other end and resistance R1 and resistance R2
End connected voltage-regulator diode D1 and electric capacity C2, the resistance R1 other end are connected with comparator U1 in-phase input end, resistance R2
The other end be connected with reference power supply, the in-phase input end of the comparator U1 is grounded by electric capacity C1.
A kind of 3. control circuit according to claim 1, it is characterised in that：The input bleeder circuit unit includes two poles
Pipe D2, electric capacity C3 and C4, resistance R3, R4, R5 and R6, the inverting input of the negative electrode of the diode D2 and the comparator U1
It is connected, diode D2 anode is connected to mains electricity input end by resistance R6, and resistance R4 is connected in parallel on diode D2 both ends, described
Comparator U1 inverting input is also grounded by resistance R3 and electric capacity C4 respectively, and the anode of the diode D2 passes through electricity respectively
Hinder R4 and electric capacity C3 ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720198695.8U CN206640832U (en) | 2017-03-02 | 2017-03-02 | A kind of control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720198695.8U CN206640832U (en) | 2017-03-02 | 2017-03-02 | A kind of control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206640832U true CN206640832U (en) | 2017-11-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720198695.8U Active CN206640832U (en) | 2017-03-02 | 2017-03-02 | A kind of control circuit |
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| CN (1) | CN206640832U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108848576A (en) * | 2018-07-14 | 2018-11-20 | 潘忠浩 | A kind of control method adapting to wide input voltage controller for electric-heated blanket |
-
2017
- 2017-03-02 CN CN201720198695.8U patent/CN206640832U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108848576A (en) * | 2018-07-14 | 2018-11-20 | 潘忠浩 | A kind of control method adapting to wide input voltage controller for electric-heated blanket |
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