CN206790730U - LED adjusting control circuit - Google Patents
LED adjusting control circuit Download PDFInfo
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- CN206790730U CN206790730U CN201720363240.7U CN201720363240U CN206790730U CN 206790730 U CN206790730 U CN 206790730U CN 201720363240 U CN201720363240 U CN 201720363240U CN 206790730 U CN206790730 U CN 206790730U
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Abstract
The utility model discloses a kind of LED adjusting control circuit, it includes current rectifying and wave filtering circuit A, pulse width modulation and transforming circuit B, rectifier filter circuit C, DC pulse width modulated dimmer circuit D and the LED string E as load, the high-frequency direct-current voltage output tremendously high frequency current rectifying and wave filtering circuit C exported after pulse width modulation and transforming circuit B, LED string E electric current is controlled by DC pulse width modulated dimmer circuit D again, adjustment is input to the size of current in LED string E, realizes the light modulation to LED string E.Because the utility model uses modular PWM, its technology maturation, cost is cheap, and uses light adjusting circuit of the present utility model, and the light modulation in the range of LED string 0 100% can be achieved, and its light modulation precision is high.
Description
Technical field：
The light regulating technology field of light source is the utility model is related to, refers in particular to a kind of LED adjusting control circuit.
Background technology：
With the progress of light emitting diode (Light Emitting Diode, abbreviation LED) technology, many illuminations at present are used
Light fixture uses LED bulb.Relative to traditional incandescent lamp, fluorescent lamp, LED has the advantages of low energy consumption, long lifespan.
LED uses DC driven, different from the dimming mode of traditional bulb, and incandescent lamp is to lean on regulation resistance control electric current size to adjust
Light.Fluorescent lamp is dimmed by ballast change frequency, voltage change.It is traditional and LED is based on its principle of luminosity
Light adjusting circuit is not particularly suited for LED.So in order to be applicable the light modulation needs of LED, the present inventor proposes a kind of following LED
Use adjusting control circuit.
Utility model content：
Technical problem to be solved in the utility model is to provide a kind of LED adjusting control circuit.
In order to solve the above-mentioned technical problem, the utility model employs following technical proposals：LED brightness adjustment control electricity
Road includes：Current rectifying and wave filtering circuit A, pulse width modulation and transforming circuit B, rectifier filter circuit C, DC pulse width are adjusted
Light adjusting circuit D processed and the LED string E as load, external communication are electrically accessed current rectifying and wave filtering circuit A, by bridge rectifier, filter
Alternating current is converted into direct current after ripple, and is output to pulse width modulation and transforming circuit B, pulse width modulation and change piezoelectricity
Road B controls ICU1 and transformer T1 to change the pulsewidth and frequency of inputted direct current by its pulse width modulation, and exports
High-frequency direct-current voltage；The high-frequency direct-current voltage output tremendously high frequency rectification filter exported after pulse width modulation and transforming circuit B
Wave circuit C, then by being DC pulse width modulated after the voltage stabilizing in DC pulse width modulated dimmer circuit D and rectification circuit
Control ICU2 to provide steady dc voltage, and by DC pulse width modulated control ICU2 control LED strings E electric current, lead to
The potentiometer VR1 controlling transistor Q1 crossed on access DC pulse width modulated control ICU2, LED string is input to so as to adjust
Size of current in E, realize the light modulation to LED string E.
Furthermore, in above-mentioned technical proposal, guarantor is provided between described external communication electricity and current rectifying and wave filtering circuit A
Dangerous element F1.
Furthermore, in above-mentioned technical proposal, the transformer T1 bags in described pulse width modulation and transforming circuit B
Primary coil, secondary coil and ancillary coil are included, wherein primary coil is as boost inductance；Secondary coil is as output stage
Voltage is provided for LED string E；Described ancillary coil is used to detect the zero cross signal in inductive current, and is adjusted with pulse width
System control ICU1 connections.
Furthermore, in above-mentioned technical proposal, described pulse width modulation control ICU1 is wherein connected on a pin
There is regulation electric capacity C4.
Furthermore, in above-mentioned technical proposal, between described LED LED string E and whole loop one is connected with to open
Close S1.
After adopting the above technical scheme, the utility model has the advantages that compared with prior art：This practicality
New pulse width modulation first (PWM) and transforming circuit B and transformer T1 change the pulsewidth and frequency of the DC voltage of input,
Then the size of current being carried on LED string E is adjusted by DC pulse width modulated (PWM) light adjusting circuit D again, so as to real
The light modulation of existing LED string.Because the utility model uses modular PWM, its technology maturation, cost is cheap, and using this
The light adjusting circuit of utility model, can be achieved the light modulation in the range of LED string 0-100%, and its light modulation precision is high.
Brief description of the drawings：
Fig. 1 is circuit theory diagrams of the present utility model；
Fig. 2 is circuit diagram of the present utility model.
Embodiment：
The utility model is further illustrated with reference to specific embodiments and the drawings.
As shown in Fig. 1,2, the utility model is a kind of LED adjusting control circuit, and the loop of the circuit includes：Rectification
Filter circuit A, pulse width modulation and transforming circuit B, rectifier filter circuit C, DC pulse width modulated dimmer circuit D
And the LED string E as load.
External communication is electrically accessed current rectifying and wave filtering circuit A, and alternating current is converted into direct current after bridge rectifier, filtering,
And pulse width modulation and transforming circuit B are output to, pulse width modulation and transforming circuit B are controlled by its pulse width modulation
IC U1 and transformer T1 changes the pulsewidth and frequency of inputted direct current, and exports high-frequency direct-current voltage；By pulse width
The high-frequency direct-current voltage output tremendously high frequency current rectifying and wave filtering circuit C exported after modulation and transforming circuit B, then passes through DC pulse width
ICU2 is controlled to provide galvanic current for DC pulse width modulated after voltage stabilizing and rectification circuit in modulation light adjusting circuit D
Pressure, and by DC pulse width modulated control IC U2 control LED strings E electric current, by accessing DC pulse width modulated control
Potentiometer VR1 controlling transistor Q1 on IC U2 processed, so as to adjust the size of current being input in LED string E, are realized to LED
Lamp string E light modulation.
Outside civil power is by voltage is 100-240V, frequency is 50Hz/60Hz alternating current by terminals of the present utility model
Input, in order to ensure safety, safety element F1 is provided between described external communication electricity and current rectifying and wave filtering circuit A.
The alternating current of outside input becomes direct current by bridge rectifier D B1 rectifications, then by electric capacity C1, electric capacity
The filter circuit that C2, inductance L1, inductance L2 are formed, the clutter in rectified current is filtered out.
Electric current after rectifying and wave-filtering will export to pulse width modulation and the transforming circuit B pulse width modulations and become piezoelectricity
Road B constitutes an APFC.The utility model is made using boost type active circuit of power factor correction
For pre-regulator.Transformer T1 in the pulse width modulation and transforming circuit B includes primary coil, secondary coil, Yi Jifu
Index contour circle, wherein primary coil is as boost inductance；Secondary coil provides voltage as output stage for LED string E；Described is auxiliary
Index contour circle is used to detect the zero cross signal in inductive current, and is connected with pulse width modulation control ICU1.I.e. by by pulse
Width modulated (PWM) controls the pulsewidth and arteries and veins frequency (frequency) output high-frequency DC of IC U1 and inverter T1 change DC voltages
Pressure.In addition, described pulse width modulation control IC U1 are wherein connected with regulation electric capacity C4 on a pin.Pulse width modulation
ON time in size control transformer T1 input circuits of the control chip U1 by adjusting electric capacity C4.
Transformer T1 secondary coil is as output stage, itself and diode D3, electric capacity C6, the high-frequency rectification that electric capacity C7 is formed
Filter circuit C connections, smooth DC voltage is obtained after over commutation, filtering.
Above-mentioned process rectifier filter circuit C obtains direct voltage output to DC pulse width modulated dimmer circuit
D.DC pulse width modulated dimmer circuit D includes：The filter circuit of pressure-stabilizing being made up of voltage-stabiliser tube ZD1, electric capacity C8, Yi Jizuo
For the control IC U2 of DC pulse width modulated.By the control IC that DC pulse width modulated is given after the filter circuit of pressure-stabilizing
U2 provides stable DC voltage.Control IC U2, transistor Q1, resistance R13, the resistance R14 of DC pulse width modulated form straight
Pulse direct current pulse width modulation (PWM) control circuit is flowed, for controlling LED string E electric current.Meanwhile resistance R11, resistance
The light adjusting circuit that R12, diode D4, diode D5, potentiometer VR1 are formed is used to can control transistor Q1, to adjust load (i.e.
LED string E) in size of current on DC circuit, so as to realize LED string E light modulation.
In addition, switch S1 of the present utility model is provided between LED string E and whole loop.
Certainly, specific embodiment of the utility model is the foregoing is only, is not to implement to limit the utility model
Scope, all equivalent change or modifications done according to construction, feature and principle described in present utility model application the scope of the claims, all should be wrapped
Include in present utility model application the scope of the claims.
Claims (5)
1.LED lamp adjusting control circuits, the circuit include：Current rectifying and wave filtering circuit (A), pulse width modulation and transforming circuit
(B), rectifier filter circuit (C), DC pulse width modulated dimmer circuit (D) and the LED string (E) as load,
It is characterized in that：External communication is electrically accessed current rectifying and wave filtering circuit (A), is converted to alternating current directly after bridge rectifier, filtering
Stream electricity, and pulse width modulation and transforming circuit (B) are output to, pulse width modulation and transforming circuit (B) are wide by its pulse
Spend modulation control IC (U1) and change the pulsewidth and frequency of inputted direct current with transformer (T1), and export high-frequency DC
Pressure；The high-frequency direct-current voltage output tremendously high frequency current rectifying and wave filtering circuit exported after pulse width modulation and transforming circuit (B)
(C), then by being DC pulse width modulated control after the voltage stabilizing in DC pulse width modulated dimmer circuit (D) and rectification circuit
IC (U2) processed provides steady dc voltage, and the electricity of IC (U2) control LED strings (E) is controlled by DC pulse width modulated
Stream, it is defeated so as to adjust by accessing potentiometer (VR1) controlling transistor (Q1) on DC pulse width modulated control IC (U2)
Enter to the size of current in LED string (E), realize the light modulation to LED string (E).
2. LED adjusting control circuit according to claim 1, it is characterised in that：Described external communication it is electric with it is whole
Safety element (F1) is provided between stream filter circuit (A).
3. LED adjusting control circuit according to claim 1, it is characterised in that：Described pulse width modulation and
Transformer (T1) in transforming circuit (B) includes primary coil, secondary coil and ancillary coil, wherein primary coil conduct
Boost inductance；Secondary coil is that LED string (E) provides voltage as output stage；Described ancillary coil is used to detect inductance electricity
Zero cross signal in stream, and be connected with pulse width modulation control IC (U1).
4. LED adjusting control circuit according to claim 3, it is characterised in that：Described pulse width modulation control
IC (U1) processed is wherein connected with regulation electric capacity (C4) on a pin.
5. LED adjusting control circuit according to claim 1, it is characterised in that：Described LEDLED lamp strings (E) with
A switch (S1) is connected between whole loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720363240.7U CN206790730U (en) | 2017-04-08 | 2017-04-08 | LED adjusting control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720363240.7U CN206790730U (en) | 2017-04-08 | 2017-04-08 | LED adjusting control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206790730U true CN206790730U (en) | 2017-12-22 |
Family
ID=60706083
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720363240.7U Active CN206790730U (en) | 2017-04-08 | 2017-04-08 | LED adjusting control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206790730U (en) |
-
2017
- 2017-04-08 CN CN201720363240.7U patent/CN206790730U/en active Active
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