CN206118103U - Former limit feedback constant current control two -stage process dimmer circuit - Google Patents
Former limit feedback constant current control two -stage process dimmer circuit Download PDFInfo
- Publication number
- CN206118103U CN206118103U CN201621019989.1U CN201621019989U CN206118103U CN 206118103 U CN206118103 U CN 206118103U CN 201621019989 U CN201621019989 U CN 201621019989U CN 206118103 U CN206118103 U CN 206118103U
- Authority
- CN
- China
- Prior art keywords
- power switch
- switch pipe
- control chip
- winding
- primary side
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
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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
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The utility model discloses a former limit feedback constant current control two -stage process dimmer circuit, including transformer, first power switch pipe, second power switch pipe, control chip sampling resistor, the transformer includes primary side winding, vice limit winding and auxiliary winding, and primary side winding's the one end and the drain electrode of first power switch pipe are connected, and the both ends of vice limit winding are connected with load circuit through first rectification filter circuit, and auxiliary winding's one end is held with control chip's voltage input and is connected, and the other end and control chip's secondary current detection terminal is connected, the one end ground connection of sampling resistor, the other end with the source connection of first power switch pipe, control chip's former limit current detection terminal through a divider resistance with the source connection of first power switch pipe, control chip's the output and the grid of first power switch pipe are connected, second power switch outside of tubes connects the 2nd divider resistance circuit break -make of control module control and divider resistance series connection. The utility model discloses can realize the two -stage process adjusts luminance.
Description
Technical field
The utility model is related to integrated circuit fields, more particularly to a kind of primary side feedback constant-current control circuit, for realizing
Two sections of light modulations of light emitting diode.
Background technology
In integrated circuit fields, need to realize constant current in many applications.For example, for light emitting diode (LED：Light
Emitting Diode) illumination, because the voltage-current characteristic of LED is with diode-like seemingly, LED current is to the electricity added by two ends
Pressure is especially sensitive, and very small voltage change can all cause very big curent change.Curent change is excessive not only to affect LED
Life-span, or even LED can be caused to burn.In order to control to flow through the electric current of LED well, it is clear that driven with a constant pressure source
LED is inappropriate, and constant-current source is only suitable selection.
In order to realize constant current, at present conventional is that LED is driven by primary side feedback constant-current control circuit, but the driving
Mode is all firm power output, it is impossible to power output is adjusted, and then intensity of illumination can not be adjusted, to using
Person brings serious inconvenience.
Utility model content
Goal of the invention of the present utility model is to provide a kind of two sections of light adjusting circuits of primary side feedback current constant control, can realize
Two sections of regulations of LED luminance, lift the convenience for using.
To achieve the above object of the invention, the technical solution adopted in the utility model is：A kind of primary side feedback current constant control two
Section light adjusting circuit, including transformer, the first power switch pipe, the second power switch pipe, control chip and sampling resistor；Its
In,
The transformer includes primary side winding, vice-side winding and assists winding, one end of the primary side winding and the first work(
The drain electrode connection of rate switching tube, the two ends of the vice-side winding are connected by the first current rectifying and wave filtering circuit with load circuit, described
One end of assists winding is connected with the voltage input end of control chip, and the other end connects with the secondary current test side of control chip
Connect；
One end ground connection of the sampling resistor, the other end is connected with the source electrode of first power switch pipe；
The source electrode of the divider resistance of primary current test side first of the control chip and first power switch pipe
Connection, the output end of the control chip is connected with the grid of first power switch pipe；
The drain electrode divider resistances of Jing second of second power switch pipe and the primary current test side of the control chip
Connection, source ground, grid is connected with external control signal input；
First divider resistance and the second divider resistance are connected.
Further, the assists winding two ends are additionally provided with the second current rectifying and wave filtering circuit, for defeated to external control signal
Enter module and power supply is provided.
Further, diode is provided between the grid and external control signal input of second power switch pipe,
The positive pole of the diode is connected to the grid of the second power switch pipe.
Further, also including the Zener diode and resistance being arranged in parallel, the negative pole of the Zener diode is connected to
Between the grid and diode of second power switch pipe, the plus earth of the Zener diode
Because above-mentioned technical proposal is used, the utility model has compared with prior art following advantages：
The utility model by the second divider resistance of connecting on the first divider resistance, and by the second power switch management and control
The break-make of the second voltage dividing resistance circuit is made, so as to change the partial pressure on sampling resistor, and then changes output current, realize two sections of tune
Light.
Description of the drawings
Fig. 1 is circuit diagram of the present utility model in embodiment one.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment is further described to the utility model：
Embodiment one：
It is shown in Figure 1, a kind of two sections of light adjusting circuits of primary side feedback current constant control, including transformer, the first power switch
Pipe Q1, the second power switch pipe Q2, control chip and sampling resistor R7；Wherein,
The transformer includes primary side winding, vice-side winding and assists winding, one end of the primary side winding and the first work(
The drain electrode connection of rate switching tube Q1, the two ends of the vice-side winding are connected by the first current rectifying and wave filtering circuit with load circuit, institute
State one end of assists winding to be connected with the voltage input end VCC of control chip, the other end is detected with the secondary current of control chip
End FB connections；
One end ground connection of the sampling resistor R7, the other end is connected with the source electrode of the first power switch pipe Q1；
Primary current test side CS Jing the first divider resistance R6 and the first power switch pipe Q1 of the control chip
Source electrode connection, output end GATE of the control chip is connected with the grid of the first power switch pipe Q1；
Drain electrode Jing the second divider resistance R12 of the second power switch pipe Q2 are examined with the primary current of the control chip
End CS connections are surveyed, source ground, grid is connected with external control signal input DIM；
The first divider resistance R6 and the second divider resistance R12 connects.
The assists winding two ends are additionally provided with the second current rectifying and wave filtering circuit, for providing to external control signal input module
Power supply (i.e. VCC and GND ports), including diode D20 and electric capacity C26, the positive pole of the diode D20 sequentially passes through resistance
R17 and diode D7 are connected to the voltage input end VCC of control chip, and the positive pole of diode D7 is connected to resistance R17, electric capacity
C26 one end is connected to the negative pole of diode D20, other end ground connection.
Diode D22 is provided between the grid and external control signal input of the second power switch pipe Q2, it is described
The positive pole of diode D22 is connected to the grid of the second power switch pipe Q2, and its effect is to prevent external control signal input DIM
On have too high voltages occur damage the second power switch pipe Q2.
Also include Zener diode ZD1 and the resistance R14 being arranged in parallel, for protecting the second power switch pipe Q2, and carry
For the discharge path of Q2 grids, the negative pole of the Zener diode ZD1 be connected to the grid of the second power switch pipe Q2 with
Between diode D22, the plus earth of the Zener diode ZD1, the negative pole and diode D20 of the Zener diode ZD1
Negative pole between be also in series with resistance R13.
Specifically, be additionally provided with primary side winding circuit of the present utility model electric capacity C4 and C7, resistance R20, inductance L1 and
Diode D8, electric capacity C4 mono- terminate VIN, other end ground connection；After electric capacity C7 and resistance R20 are in parallel, a termination VIN, another termination
The negative pole of diode D8, the positive pole Jing inductance L1 of diode D8 are connected to the drain electrode of the first power switch pipe Q1.
The first current rectifying and wave filtering circuit in vice-side winding circuit include diode D10, electrochemical capacitor BC2, BC3, BC4 and
BC5, electric capacity C10 and resistance R24, wherein electrochemical capacitor BC2, BC3, BC4 and BC5, electric capacity C10 and resistance R24 are in parallel even
Connect, one end of parallel-connection structure is connected to the negative pole of diode D10, other end Jing electric capacity CY5 ground connection；It is additionally provided with resistance R22, R23
With electric capacity C9, resistance R22 and R23 be in parallel, and the one end after parallel connection is connected to the positive pole of diode D10, and other end Jing electric capacity C9 connects
It is connected between electrochemical capacitor BC2 and BC3.
Resistance R18 and R19, electric capacity C6 and electrochemical capacitor BC1, resistance R18 and R19 string are additionally provided with assists winding circuit
One end connects the positive pole of diode D20 after connection, and other end ground connection, the intermediate node of resistance R18 and R19 is connected to control chip
The voltage input end VCC of secondary current test side FB, electric capacity C6 and electrochemical capacitor BC1 latter termination control chip in parallel, it is another
End ground connection, the intermediate node of electric capacity C6 and electrochemical capacitor BC1 sequentially passes through resistance R4, R3 and R2 of series connection and is connected to primary side winding
VIN.
The primary current test side CS Jing electric capacity C2 ground connection of control chip, secondary current test side FB Jing electric capacity C3 ground connection,
COMP ends Jing electric capacity C5 ground connection, output end GATE sequentially passes through resistance R5, the resistance R11 that is arranged in parallel and diode D5 and is connected to
The grid of the first power switch pipe Q1, between the grid and source electrode of the first power switch pipe Q1 resistance R10 is further connected with.
Operation principle of the present utility model is, when not accessing external control module or external control signal input DIM
Be input into for high level when, the grid potential of the second power switch pipe Q2 is high level, Q2 conductings, and R12 and R6 is to sampling resistor R7
On voltage carry out after partial pressure, send into control chip, now, output current is maximum output current；When external control signal it is defeated
When to enter to hold DIM input signals be low level 0, the grid potential of Q2 is equal to the forward conduction voltage of D22, about 1V, Q2 cut-off, R12
Voltage on sampling resistor R7 is had no effect, output current is about the half of maximum output current, it is achieved thereby that two sections
Light modulation.
Claims (4)
1. two sections of light adjusting circuits of a kind of primary side feedback current constant control, it is characterised in that：Including transformer, the first power switch pipe,
Second power switch pipe, control chip and sampling resistor；Wherein,
The transformer includes primary side winding, vice-side winding and assists winding, and one end of the primary side winding is opened with the first power
The drain electrode connection of pipe is closed, the two ends of the vice-side winding are connected by the first current rectifying and wave filtering circuit with load circuit, the auxiliary
One end of winding is connected with the voltage input end of control chip, and the other end is connected with the secondary current test side of control chip；
One end ground connection of the sampling resistor, the other end is connected with the source electrode of first power switch pipe；
The divider resistance of primary current test side first of the control chip is connected with the source electrode of first power switch pipe,
The output end of the control chip is connected with the grid of first power switch pipe；
The drain electrode divider resistances of Jing second of second power switch pipe are connected with the primary current test side of the control chip,
Source ground, grid is connected with external control signal input；
First divider resistance and the second divider resistance are connected.
2. two sections of light adjusting circuits of primary side feedback current constant control according to claim 1, it is characterised in that：The assists winding
Two ends are additionally provided with the second current rectifying and wave filtering circuit, for providing power supply to external control signal input module.
3. two sections of light adjusting circuits of primary side feedback current constant control according to claim 1, it is characterised in that：Second power
A diode is provided between the grid and external control signal input of switching tube, the positive pole of the diode is connected to the second work(
The grid of rate switching tube.
4. two sections of light adjusting circuits of primary side feedback current constant control according to claim 3, it is characterised in that：Also set including parallel connection
The Zener diode put and resistance, the negative pole of the Zener diode is connected to grid and two poles of second power switch pipe
Between pipe, the plus earth of the Zener diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621019989.1U CN206118103U (en) | 2016-08-31 | 2016-08-31 | Former limit feedback constant current control two -stage process dimmer circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621019989.1U CN206118103U (en) | 2016-08-31 | 2016-08-31 | Former limit feedback constant current control two -stage process dimmer circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206118103U true CN206118103U (en) | 2017-04-19 |
Family
ID=58516254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621019989.1U Expired - Fee Related CN206118103U (en) | 2016-08-31 | 2016-08-31 | Former limit feedback constant current control two -stage process dimmer circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206118103U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107733241A (en) * | 2017-11-14 | 2018-02-23 | 深圳睿舍智能科技有限公司 | Double primary side insulating power supplies |
| CN108738203A (en) * | 2018-07-13 | 2018-11-02 | 深圳安赋特科技有限公司 | LED power invariable power input control circuit |
| CN109406860A (en) * | 2018-12-24 | 2019-03-01 | 厦门能瑞康电子有限公司 | A kind of voltage sampling circuit |
-
2016
- 2016-08-31 CN CN201621019989.1U patent/CN206118103U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107733241A (en) * | 2017-11-14 | 2018-02-23 | 深圳睿舍智能科技有限公司 | Double primary side insulating power supplies |
| CN108738203A (en) * | 2018-07-13 | 2018-11-02 | 深圳安赋特科技有限公司 | LED power invariable power input control circuit |
| CN109406860A (en) * | 2018-12-24 | 2019-03-01 | 厦门能瑞康电子有限公司 | A kind of voltage sampling circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170419 Termination date: 20200831 |