CN206698466U - A kind of LED adjusting control circuits - Google Patents
A kind of LED adjusting control circuits Download PDFInfo
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- CN206698466U CN206698466U CN201720287393.8U CN201720287393U CN206698466U CN 206698466 U CN206698466 U CN 206698466U CN 201720287393 U CN201720287393 U CN 201720287393U CN 206698466 U CN206698466 U CN 206698466U
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Abstract
The utility model discloses a kind of LED adjusting control circuits, including power switch, square wave output circuit, counter, primary current peak detection circuit, drive circuit, switching tube and inspection leakage resistance, the input of the output end connection primary current peak detection circuit of the counter；The primary current peak detection circuit includes reference voltage selector and detection comparator；The output end of the input in the same direction termination reference voltage selector of detection comparator, the input of the output termination drive circuit of detection comparator, the output end connecting valve tube grid of drive circuit, switching tube source electrode connect inspection leakage resistance one end, examine another terminating load of leakage resistance；Draw the reverse input end that signal lines are connected to detection comparator in the junction of the source electrode of switching tube and inspection leakage resistance.LED adjusting control circuits of the present utility model simplify the structure of existing adjusting control circuit, save cost.
Description
Technical field
It the utility model is related to LED control fields, more particularly to a kind of LED adjusting control circuits.
Background technology
With energy-saving and emission-reduction and the continuous enhancing of green consciousness, the market of LED illumination expands rapidly, substituted for original
Incandescent lamp market.If it is desired to being dimmed to LED illumination with lamp brightness, the most frequently used brilliance control mode is exactly using controllable
Silicon dimming mode and PWM dimming modes.Both the above dimming mode is required for increasing certain external devices, controllable silicon light modulation
Need to increase thyristor chopper part and the increased controllable silicon detection port of chip；PWM light modulations then need to increase pwm signal hair
Raw chip coordinates.
More than described two kind dimming mode need to increase certain coordination device and could realize light modulation purpose so that
LED control system is complicated, and cost is consequently increased.
Utility model content
Purpose of utility model：In order to simply and easily adjust LED illumination lamp brightness, the utility model provides a kind of LED
Adjusting control circuit.
Technical scheme：A kind of LED adjusting control circuits, including power switch, square wave output circuit, counter, primary electrical
Peak detection circuit, drive circuit, first switch pipe M1 and inspection leakage resistance R2, the square wave output circuit is flowed to be used for according to power supply
Switch motion produces square-wave signal；The counter is used to add up the number of square wave and exports binary signal；The counter
Output end connection primary current peak detection circuit input；The primary current peak detection circuit includes reference voltage
Selector and detection comparator；Reference voltage selector is used to select reference voltage according to binary signal, detection comparator
The output end of input termination reference voltage selector in the same direction, the input of the output termination drive circuit of detection comparator, driving
The output end connection first switch pipe M1 grids of circuit, first switch pipe M1 source electrodes meet inspection leakage resistance R2 one end, inspection leakage resistance R2
Another terminating load；First switch pipe M1 source electrode is compared with examining leakage resistance R2 junction extraction signal lines and being connected to detection
The reverse input end of device.
Further, in addition to switching frequency control circuit of duty ratio, the switching frequency control circuit of duty ratio are used for
The make-and-break time of switching tube is adjusted according to binary signal；Switching frequency control circuit of duty ratio includes dutycycle selector and electricity
Stream calculation device, the dutycycle selector are used to select dutycycle, the output termination of dutycycle selector according to binary signal
The input of current calculator, the current calculator include second switch pipe M2, the 3rd switching tube M3, the first current source A1,
Second current source A2 and electric capacity C1, second switch pipe M2 drain electrode connects the first current source A1, second switch pipe M2 grid with
3rd switching tube M3 grid connection, second switch pipe M2 source class and the 3rd switching tube M3 one end to drain with electric capacity C1
Connection, the 3rd switching tube M3 source class are connected by the second current source A2 with the electric capacity C1 other end；Second switch pipe M2 source
Level is the output end of current calculator, and is connected with the input of drive circuit.
Further, the counter includes counting circuit and encoder, and the counting circuit is used for the square wave output that adds up
Accumulation result is compiled into binary signal by the square-wave signal of circuit output, the encoder.
Further, the reference voltage selector is data selector, and data selector includes selection control terminal, input
End and output end, selection control termination binary signal, input input different reference voltages, and output end, which is used to export, to be selected
Reference voltage.
Further, the dutycycle selector is data selector, and data selector includes selection control terminal, input
And output end, selection control termination binary signal, input input different dutycycles, output end is used to export accounting for for selection
Dutycycle is simultaneously passed to current calculator by sky ratio.
Beneficial effect：Compare prior art, a kind of LED adjusting control circuits provided by the utility model, simplifies existing
Some light adjusting systems, reduce the cost of LED dimming control systems；Circuit is detected by primary current peak and switching frequency accounts for
The empty size than control circuit comprehensive adjustment output current, so as to adjust load LED brightness, increase or decrease as needed
LED luminance, play the effect of energy-conserving and environment-protective.Different dutycycles is selected to play auxiliary using switching frequency dutycycle selection circuit
Effect, make control more accurate, effect is more preferable.
Brief description of the drawings
Fig. 1 is the theory diagram of LED adjusting control circuits in the utility model；
Fig. 2 is the theory diagram that square wave output circuit exports square wave in the utility model；
Fig. 3 is the theory diagram that primary current peak detects circuit in the utility model；
Fig. 4 is the schematic diagram of switching frequency control circuit of duty ratio in the utility model；
Fig. 5 is the pressure drop and first switch pipe in the utility model in switching frequency control circuit of duty ratio on electric capacity C1
Break-make graph of a relation；
Fig. 6 is the theory diagram of the utility model Counter.
Embodiment
The utility model is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
As shown in figure 1, LED adjusting control circuits include power switch, square wave output circuit, counter 1, primary electrical stream peak
Value detection circuit 2, drive circuit 3, first switch pipe M1 and inspection leakage resistance R2, the square wave output circuit are used to be opened according to power supply
Pass action produces square-wave signal, and the schematic diagram for producing square-wave signal is shown in Fig. 2；The counter 1 is for adding up the number of square wave simultaneously
Export binary signal；The input of the output end connection primary current peak detection circuit 2 of the counter 1；Such as Fig. 3 institutes
Show, the primary current peak detection circuit 2 includes reference voltage selector 21 and detection comparator 22；Reference voltage selector
21 are used to select reference voltage according to binary signal, and the input in the same direction of detection comparator 22 terminates the defeated of reference voltage selector
Go out end, the input of the output termination drive circuit 3 of detection comparator 22, drive circuit 3 is used to drive first switch pipe M1's
Break-make, the output end connection first switch pipe M1 grids of drive circuit 3, first switch pipe M1 source electrodes connect inspection leakage resistance R2 one end,
Examine another terminating loads of leakage resistance R2；First switch pipe M1 source electrode connects with examining leakage resistance R2 junction extraction signal lines
To the reverse input end of detection comparator 22.The benchmark voltage of detection comparator 22 and inspection are flowed after first switch pipe M1 is opened
Pressure drop on resistance R2, the pressure drop examined on leakage resistance R2 increases with the gradual increase of peak primary currents, when its pressure drop is more than
During the reference voltage of the anode of detection comparator 22, the M1 shut-offs of control first switch pipe.
Also include switching frequency control circuit of duty ratio 4, as shown in figure 4, the switching frequency control circuit of duty ratio 4 is used
In the make-and-break time that first switch pipe M1 is adjusted according to binary signal；Switching frequency control circuit of duty ratio 4 includes dutycycle
Selector 41 and current calculator 42, the dutycycle selector 41 are used to select dutycycle, dutycycle according to binary signal
The input of the output termination current calculator 42 of selector 41, the current calculator 42 include second switch pipe M2, the 3rd
Switching tube M3, the first current source A1, the second current source A2 and electric capacity C1, second switch pipe M2 drain electrode connect the first current source
A1, second switch pipe M2 grid are connected with the 3rd switching tube M3 grid, second switch pipe M2 source class and the 3rd switching tube
The one end of M3 drain electrode with electric capacity C1 is connected, and the 3rd switching tube M3 source class passes through the another of the second current source A2 and electric capacity C1
End connection；Second switch pipe M2 source class is the output end of current calculator 42, and is connected with the input of drive circuit 3, controls
First switch pipe M1 shut-offs processed.
The physical circuit operation principle of switching frequency control circuit of duty ratio 4 is：The sampling of current calculator 42 first
The time span of switching tube M1 conductings, that is, from first switch pipe M1 open after to detection comparator control first switch pipe M1
That period of shut-off；The dutycycle selected by the time sampled and binary signal, is calculated first switch
The time in the cycle that pipe M1 is entirely switched, and when reaching the corresponding time, the M1 conductings of control first switch pipe are next to enter
Work period.
Second switch pipe M2 in Fig. 5 follows first switch pipe M1 to be in equal state, is led when first switch pipe M1 is in
During logical state, second switch pipe M2 is controlled to be in identical conducting state together by logic circuit.Turned in first switch pipe M1
Initial stage, second switch pipe M2 are begun to turn on, and fixed current source is that the first current source A1 is filled by second switch pipe M2 to electric capacity C1
Electricity, electric capacity C1 pressure drops are begun to ramp up from initial value V1 and the pressure drop within the first switch pipe M1 conducting period on electric capacity C1 continues
Rise.After the first switch pipe M1 for being controlled by primary current peak detection circuit 2 is closed, second switch pipe M2 is equally closed
Close, electric capacity C1 pressure drop reaches V2；With this simultaneously, the 3rd switching tube M3 is opened, and the 3rd switching tube M3 is put a little to electric capacity C1, electric capacity
C1 pressure drops are begun to decline by V2 values.The different duty selection signal selected by encoder has corresponding discharge current source
That is the second current source A2, by the second current source A2 continuous discharges, when electric capacity C1 pressure drop is reduced to V1 initial values, control is produced
Signal control first switch pipe M1 processed enters conducting state, reciprocal with this.
Such as：When dutycycle selector 41 have selected 50% dutycycle, charging current and discharge current phase in circuit
Deng according to formula CV=IT, it is equal to obtain first switch pipe M1 ON time and shut-in time, obtains its ON time
Account for the 50% of switch periods time.When dutycycle selector 41 have selected other dutycycles, discharge current changes, C1 electric capacity
The time that V1 is reduced to by V2 voltages changes, and the ratio that its ON time accounts for switch periods is changed.
As shown in fig. 6, the counter 1 includes counting circuit 11 and encoder 12, the counting circuit 11 is used to add up
Accumulation result is compiled into binary signal by the square-wave signal of square wave output circuit output, the encoder.
Using the LED dimming controlling methods of LED adjusting control circuits, comprise the following steps：
(1) circuit and square-wave acts output square-wave signal according to power switch, and counter 1 enters to the square wave number of square-wave signal
Row is counted, and square wave number is converted into binary signal；
(2) Binary Signal Transmission detects the reference voltage selector 21 in circuit 2, benchmark to peak primary currents
Voltage selector 21 selects different reference voltages to export according to binary signal, on the collection inspection leakage resistance of detection comparator 22 R2
Pressure drop, and by the pressure drop on the inspection leakage resistance R2 with reference voltage compared with, if the pressure drop examined on leakage resistance R2 is more than
Reference voltage, then driver 3 is controlled to turn off first switch pipe M1；If the pressure drop on detection electric current R2 is higher than reference voltage, control
Driver processed opens first switch pipe M1.
The binary signal simultaneous transmission is to the dutycycle selector 41 in switching frequency duty cycle circuit 4, dutycycle
Selector 41 selects different dutycycles according to binary signal, and current calculator 42 calculates according to the pressure drop on inspection leakage resistance R2
ON time, and according to the time of dutycycle and the whole switch periods of ON time calculating, according to ON time and switch week
The time control driver 3 of phase cut-offs first switch pipe M1.
The method that the circuit and square-wave produces square wave is：Set first threshold and Second Threshold, and first threshold is less than the
Two threshold values, it is less than from voltage after first threshold to Second Threshold is risen above again, exports effective square wave.
LED adjusting control circuits are by the conducting and shut-off of power supply switch control system, and square wave output circuit is according to power supply
The lifting of voltage produces square-wave signal, and the counting circuit 11 in counter 1 adds up the high level number of square-wave signal, will be accumulative
The signal arrived encodes as control signal, encoder 12 to control signal, obtains corresponding binary signal；Primary current
Peak detection circuit 2 includes reference voltage selector 21 and detection comparator 22, and reference voltage selector 21 is believed according to binary system
Number reference voltage corresponding to selection, detection comparator 22 compare inspection leakage resistance R2 voltage and the size of reference voltage, detection
The part gone out higher than reference voltage is the peak fractions of primary current；Switching frequency control circuit of duty ratio 4 selects including dutycycle
Device 41 and current calculator 42 are selected, the duty ratio according to corresponding to selecting binary coding of dutycycle selector 41, will be selected
The duty ratio input current calculator 42 selected, current calculator 42 calculates ON time by sampling, and accounting for according to selection
Empty ratio calculates the switch periods time.Drive circuit 3 receives primary current peak detection circuit 2 and switching frequency Duty ratio control
The signal that circuit 4 exports, and controls first switch pipe M1 on off state, including switch periods and dutycycle, so as to realize pair
The regulation of load LED lamp brightness.
Fig. 2 is schematic diagram caused by the present embodiment square-wave signal, and wherein first threshold is Vth1, Second Threshold Vth2,
After line voltage descends below first threshold voltage Vth1, to when rising above second threshold voltage Vth2 again, output has
Imitate square-wave signal.
The output current calculation formula of LED drive circuit is formula (1), wherein ToffFor the turn-off time, T is switch periods, A
For the scale parameter of dutycycle change, VREFOn the basis of voltage, RCSThe ratio ginseng changed for voltage on the basis of inspection leakage resistance R2, B
Number.When parameters keep constant in formula (1), system output current keeps constant.And when power switch produces switch motion
When, square wave output circuit exports square-wave signal, the cumulative square wave number of counter according to switch motion, and signal is compiled into by encoder
Binary coded signal, A, B parameter are changed to fixed scale parameter according to corresponding binary coded signal, to output current
It is adjusted.
The present embodiment is using primary current peak detection circuit and switching frequency duty ratio adjusting circuit cooperation, regulation
LED brightness effects are more preferable.Circuit or switching frequency control circuit of duty ratio can also be detected only with primary current peak,
LED brightness can equally be adjusted.
A kind of example of the present utility model is the foregoing is only, it is all new in this practicality not to limit the utility model
The modification made on type principle, equivalent substitution and improvement, are all contained in the scope of protection of the utility model.
Claims (5)
1. a kind of LED adjusting control circuits, it is characterised in that including power switch, square wave output circuit, counter, primary electrical
Peak detection circuit, drive circuit, first switch pipe M1 and inspection leakage resistance R2, the square wave output circuit is flowed to be used for according to power supply
Switch motion produces square-wave signal；The counter is used to add up the number of square wave and exports binary signal；The counter
Output end connection primary current peak detection circuit input；The primary current peak detection circuit includes reference voltage
Selector and detection comparator；Reference voltage selector is used to select reference voltage according to binary signal, detection comparator
The output end of input termination reference voltage selector in the same direction, the input of the output termination drive circuit of detection comparator, driving
The output end connection first switch pipe M1 grids of circuit, first switch pipe M1 source electrodes meet inspection leakage resistance R2 one end, inspection leakage resistance R2
Another terminating load；First switch pipe M1 source electrode is compared with examining leakage resistance R2 junction extraction signal lines and being connected to detection
The reverse input end of device.
2. LED adjusting control circuits according to claim 1, it is characterised in that also including switching frequency Duty ratio control
Circuit, the switching frequency control circuit of duty ratio are used for the make-and-break time that switching tube is adjusted according to binary signal；Switch frequency
Rate control circuit of duty ratio includes dutycycle selector and current calculator, and the dutycycle selector is used to be believed according to binary system
Number selection dutycycle, dutycycle selector output termination current calculator input, the current calculator include second
Switching tube M2, the 3rd switching tube M3, the first current source A1, the second current source A2 and electric capacity C1, second switch pipe M2 drain electrode connect
The first current source A1 is met, second switch pipe M2 grid is connected with the 3rd switching tube M3 grid, second switch pipe M2 source class
Be connected with the 3rd switching tube M3 one end with electric capacity C1 of drain electrode, the 3rd switching tube M3 source class by the second current source A2 and
Electric capacity C1 other end connection；Second switch pipe M2 source class be current calculator output end, and with the drive circuit
Input connects.
3. LED adjusting control circuits according to claim 1 or 2, it is characterised in that the counter includes counting circuit
And encoder, the counting circuit are used to adding up the square-wave signal of square wave output circuit output, the encoder is by accumulation result
It is compiled into binary signal.
4. LED adjusting control circuits according to claim 1 or 2, it is characterised in that the reference voltage selector is number
According to selector, data selector includes selection control terminal, input and output end, selection control termination binary signal, input
End inputs different reference voltages, and output end is used for the reference voltage for exporting selection.
5. LED adjusting control circuits according to claim 2, it is characterised in that the dutycycle selector selects for data
Device is selected, data selector includes selection control terminal, input and output end, and selection control terminates binary signal, and input is defeated
Enter different dutycycles, output end is used to export the dutycycle of selection and dutycycle is passed into current calculator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720287393.8U CN206698466U (en) | 2017-03-23 | 2017-03-23 | A kind of LED adjusting control circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720287393.8U CN206698466U (en) | 2017-03-23 | 2017-03-23 | A kind of LED adjusting control circuits |
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| Publication Number | Publication Date |
|---|---|
| CN206698466U true CN206698466U (en) | 2017-12-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720287393.8U Withdrawn - After Issue CN206698466U (en) | 2017-03-23 | 2017-03-23 | A kind of LED adjusting control circuits |
Country Status (1)
| Country | Link |
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| CN (1) | CN206698466U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107071967A (en) * | 2017-03-23 | 2017-08-18 | 苏州智浦芯联电子科技股份有限公司 | A kind of LED adjusting control circuits and dimming controlling method |
-
2017
- 2017-03-23 CN CN201720287393.8U patent/CN206698466U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107071967A (en) * | 2017-03-23 | 2017-08-18 | 苏州智浦芯联电子科技股份有限公司 | A kind of LED adjusting control circuits and dimming controlling method |
| CN107071967B (en) * | 2017-03-23 | 2019-04-16 | 苏州智浦芯联电子科技股份有限公司 | A kind of LED adjusting control circuit and dimming controlling method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20171201 Effective date of abandoning: 20190416 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20171201 Effective date of abandoning: 20190416 |
|
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |