CN106658849A - Input voltage bilateral detection-based switch linear control circuit and method - Google Patents
Input voltage bilateral detection-based switch linear control circuit and method Download PDFInfo
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- CN106658849A CN106658849A CN201611216767.3A CN201611216767A CN106658849A CN 106658849 A CN106658849 A CN 106658849A CN 201611216767 A CN201611216767 A CN 201611216767A CN 106658849 A CN106658849 A CN 106658849A
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- sampler
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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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]
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- Measurement Of Current Or Voltage (AREA)
Abstract
The invention relates to an input voltage bilateral detection-based switch linear control circuit and method. The switch linear control circuit comprises a current sampler, a voltage sampler, a logic driving control module, a monitoring comparison module, a reference current comparison module and a voltage sampling and recording module, wherein the input end of the voltage sampling and recording module is connected with the output end of the voltage sampler; the monitoring comparison module is used for performing comparison between the output of the voltage sampling and recording module and the output of the voltage sampler, and outputting a comparison result to the input end of the logic driving control module; the logic driving control module is connected with the control end of a switch; and the switch controls the on-off of an LED current according to a control signal of the logic driving control module. By adoption of the input voltage bilateral detection-based switch linear control circuit and method, constant current is achieved based on detection on a voltage value range in an input voltage period; and the circuit is simple in structure, convenient to apply, and applicable to a low-frequency constant-current driving LED.
Description
Technical field
The present invention relates to technical field of constant current drive, specifically refers to a kind of being based on to range of voltage values in the input voltage cycle
Detected so as to reach the switched linear control circuit based on the bilateral detection of input voltage and method of constant current.
Background technology
Controlled using unique linear topology framework, and insertion switch more than the control circuit of LED of the prior art, it is main
To be low-frequency channel, traditional control structure mostly is monolateral Linear Control, and is symmetric signal, institute in the input voltage signal cycle
So that in this case, lamp bead utilization rate is low, it is impossible to realize real effectively current constant control.
The content of the invention
The purpose of the present invention is the shortcoming for overcoming above-mentioned prior art, there is provided one kind can be based on to input voltage week
Range of voltage values is detected so as to reaching constant current, simple structure, applying conveniently, suitable for low frequency constant-current driving LED in phase
Switched linear control circuit and method based on the bilateral detection of input voltage.
To achieve these goals, the present invention has following composition：
The switched linear control circuit of the bilateral detection of input voltage should be based on, it is mainly characterized by, described circuit includes electric current
Sampler, voltage sample device, logical drive control module, monitoring comparison module, reference current comparison module and voltage sample with
Logging modle, wherein：
The voltage sample is connected with the input of logging modle with the output end of the voltage sample device；
The monitoring comparison module is carried out to the voltage sample with the output of logging modle and the output of the voltage sample device
Compare, and export the input of comparative result to the logical drive control module；
Output of the reference current comparison module to the current sampler is compared with reference voltage, and knot is compared in output
The input and the voltage sample of fruit to the logical drive control module and the input of logging modle；
The logical drive module is connected with the control end of switch, and the switch is believed according to the control of the logical drive module
The current switching of number control LED, the current sampler and voltage sample device are detected to the current supply circuit of the LED.
It is preferred that being additionally provided with sample rate current modulus of conversion between described current sampler and reference current comparison module
Block.
The invention further relates to a kind of switched linear control method based on the bilateral detection of input voltage, it is mainly characterized by,
Described method is comprised the following steps：
（1）Apply supply voltage at LED two ends, and supply voltage gradually increases；
（2）When the electric current of current sampler detection reaches preset maximum value, signal is fed back into logical drive control module, opened
Switch, now the voltage at voltage sample device sample record LED two ends is V1, voltage sample and logging modle recording voltage V1 values；
（3）Supply voltage rises to and begun to decline after maximum, the voltage of voltage sample and logging modle comparison voltage sampler with
The voltage V1 of record, when the voltage of voltage sample device drops to V1, drop signal feeds back to logical drive control module, and logic is driven
Dynamic control module controlling switch closure.
The switched linear control circuit based on the bilateral detection of input voltage and the method in the invention is employed, is used
Switched linear power supply architecture, control chip is monitored to input voltage, in two stage detection voltages of input voltage raising and lowering
Whether value reaches control chip preset value, and so as to regulate and control control chip inner parameter, controlled output signal is turned on and off power
Pipe, with this constant-current driving LED.
Description of the drawings
Fig. 1 is the circuit structure diagram of the switched linear control circuit based on the bilateral detection of input voltage of the present invention.
Fig. 2 is Vdc, electric current IR1, gate and POR waveform diagram of the present invention.
Specific embodiment
In order to more clearly describe the technology contents of the present invention, carry out with reference to specific embodiment further
Description.
The present invention improves the utilization rate of circuit lamp bead using bilateral linear control.Specially：Input signal after rectification
Magnitude of voltage first rises in a cycle and declines afterwards, monitoring record its value, measuring point according to setup parameter institute in control chip really
Fixed, uphill process records magnitude of voltage, and turns off switch, detects whether input voltage drops to the note of eve during decline
Record value, if reaching, reopens switch, so periodically controls, and finally reaches the purpose of circuit constant current.
As shown in figure 1, the circuit of the present invention includes current sampler, voltage sample device, logical drive control module, monitoring
Comparison module, reference current comparison module and voltage sample and logging modle, wherein：
The voltage sample is connected with the input of logging modle with the output end of the voltage sample device；
The monitoring comparison module is carried out to the voltage sample with the output of logging modle and the output of the voltage sample device
Compare, and export the input of comparative result to the logical drive control module；
Output of the reference current comparison module to the current sampler is compared with reference voltage, and knot is compared in output
The input and the voltage sample of fruit to the logical drive control module and the input of logging modle；
The logical drive module is connected with the control end of switch, and the switch is believed according to the control of the logical drive module
The current switching of number control LED, the current sampler and voltage sample device are detected to the current supply circuit of the LED.
By rectification, AC conversion is direct current, is just started, and por signal is the effect of initializing signal in control chip,
Switch OFF, afterwards by detecting Vdc zero passages, switch is opened.Source voltage Vdc is slowly raised from zero, and circuit is not turned on, LED
Upper electric current is zero, and when Vdc voltages are increased to the cut-in voltage VT of load LED, diode D1 conductings, current sampler electric current increases
Greatly.Correlation module is started working, and as Vdc continues to raise, when electric current reaches preset maximum value Imax, signal is fed back into logic
Drive control module, shut-off switch, current sampler detection electric current is zero, now by voltage sample device sample record Vdc=
V1.Vdc continues to raise, and reaches afterwards after peak and begins to decline, and when V1 is dropped to, is captured by control chip again, and
Control drive signal opens switch, and circuit turn-on, with Vdc declines, electric current reduction, when Vdc is less than VT, flows through load LED
Electric current is zero, but switch is still opened, and afterwards switch open is relevant with the value of record Vdc, and it doesn't matter with zero passage detection.
As shown in figure 1, after control chip electrification reset, Vdc zero passage detections, switch is opened, and Vdc starts from scratch rising, arrives
Up to cut-in voltage, circuit turn-on, leakage current starts increase, to current sample, after inverted resume module, result is sent to and is compared
Module, when electric current reaches preset value, logic, drive module receive this signal and turn off switch in time, while voltage sample with
Logging modle also receives signal and carries out an input voltage sampling, and records now Vdc voltages V1, and monitoring rate is compared with module monitors
Vdc voltages, when its value reaches V1 for the second time, give logical drive module sending signal, open switch, and Vdc zero passage detections are only
Work when switch is first switched on.
In the technical scheme of the switched linear control circuit based on the bilateral detection of input voltage of the present invention, wherein included
Each function device and modular device can correspond to actual particular hardware circuit structure, therefore these modules and unit
Merely with hardware circuit it is achieved that need not aid in being automatically obtained corresponding work(with specific control software
Energy.
The switched linear control circuit based on the bilateral detection of input voltage and the method in the invention is employed, is used
Switched linear power supply architecture, control chip is monitored to input voltage, in two stage detection voltages of input voltage raising and lowering
Whether value reaches control chip preset value, and so as to regulate and control control chip inner parameter, controlled output signal is turned on and off switch,
With this constant-current driving LED.
In this description, the present invention is described with reference to its specific embodiment.But it is clear that still can make
Various modifications and alterations are without departing from the spirit and scope of the present invention.Therefore, specification and drawings are considered as illustrative
And it is nonrestrictive.
Claims (3)
1. a kind of switched linear control circuit based on the bilateral detection of input voltage, it is characterised in that described circuit includes electricity
Stream sampler, voltage sample device, logical drive control module, monitoring comparison module, reference current comparison module and voltage sample
With logging modle, wherein：
The voltage sample is connected with the input of logging modle with the output end of the voltage sample device；
The monitoring comparison module is carried out to the voltage sample with the output of logging modle and the output of the voltage sample device
Compare, and export the input of comparative result to the logical drive control module；
Output of the reference current comparison module to the current sampler is compared with reference voltage, and knot is compared in output
The input and the voltage sample of fruit to the logical drive control module and the input of logging modle；
The logical drive module is connected with the control end of switch, and the switch is believed according to the control of the logical drive module
The current switching of number control LED, the current sampler and voltage sample device are detected to the current supply circuit of the LED.
2. the switched linear control circuit based on the bilateral detection of input voltage according to claim 1, it is characterised in that institute
Sample rate current modular converter is additionally provided between the current sampler stated and reference current comparison module.
3. the switched linear control method based on the bilateral detection of input voltage of a kind of circuit according to claim 1, its
It is characterised by, described method is comprised the following steps：
（1）Apply supply voltage at LED two ends, and supply voltage gradually increases；
（2）When the electric current of current sampler detection reaches preset maximum value, signal is fed back into logical drive control module, opened
Switch, now the voltage at voltage sample device sample record LED two ends is V1, voltage sample and logging modle recording voltage V1 values；
（3）Supply voltage rises to and begun to decline after maximum, the voltage of voltage sample and logging modle comparison voltage sampler with
The voltage V1 of record, when the voltage of voltage sample device drops to V1, drop signal feeds back to logical drive control module, and logic is driven
Dynamic control module controlling switch closure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611216767.3A CN106658849A (en) | 2016-12-26 | 2016-12-26 | Input voltage bilateral detection-based switch linear control circuit and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611216767.3A CN106658849A (en) | 2016-12-26 | 2016-12-26 | Input voltage bilateral detection-based switch linear control circuit and method |
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| Publication Number | Publication Date |
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| CN106658849A true CN106658849A (en) | 2017-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611216767.3A Pending CN106658849A (en) | 2016-12-26 | 2016-12-26 | Input voltage bilateral detection-based switch linear control circuit and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107966612A (en) * | 2017-12-27 | 2018-04-27 | 苏州菲达旭微电子有限公司 | A kind of chopped phase detection circuit |
| CN107979898A (en) * | 2017-12-27 | 2018-05-01 | 苏州菲达旭微电子有限公司 | Low-voltage LED linear drive circuit |
| CN109195273A (en) * | 2018-10-26 | 2019-01-11 | 深圳市晟碟半导体有限公司 | A kind of constant power control device and constant-power control method of LED lamp |
| CN107966612B (en) * | 2017-12-27 | 2024-06-07 | 国网安徽省电力有限公司无为市供电公司 | Chopper phase detection circuit |
-
2016
- 2016-12-26 CN CN201611216767.3A patent/CN106658849A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107966612A (en) * | 2017-12-27 | 2018-04-27 | 苏州菲达旭微电子有限公司 | A kind of chopped phase detection circuit |
| CN107979898A (en) * | 2017-12-27 | 2018-05-01 | 苏州菲达旭微电子有限公司 | Low-voltage LED linear drive circuit |
| CN107966612B (en) * | 2017-12-27 | 2024-06-07 | 国网安徽省电力有限公司无为市供电公司 | Chopper phase detection circuit |
| CN109195273A (en) * | 2018-10-26 | 2019-01-11 | 深圳市晟碟半导体有限公司 | A kind of constant power control device and constant-power control method of LED lamp |
| CN109195273B (en) * | 2018-10-26 | 2021-03-30 | 深圳市晟碟半导体有限公司 | Constant power control device and constant power control method for LED lamp |
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| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170510 |
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| WD01 | Invention patent application deemed withdrawn after publication |