CN104582172A - LED driving circuit with PWM dimming interface - Google Patents
LED driving circuit with PWM dimming interface Download PDFInfo
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- CN104582172A CN104582172A CN201410848622.XA CN201410848622A CN104582172A CN 104582172 A CN104582172 A CN 104582172A CN 201410848622 A CN201410848622 A CN 201410848622A CN 104582172 A CN104582172 A CN 104582172A
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Abstract
The invention discloses an LED driving circuit with a PWM dimming interface. The driving device comprises an input end, a constant-voltage power supply device, a constant-current power supply device and a digital control circuit, wherein the input end is used for receiving alternating current, the constant-voltage power supply device is used for conducting voltage conversion on the received alternating current so that the voltage can be suitable for driving an LED, the constant-current power supply device is used for conducting current conversion on output of the constant-voltage power supply device so that the current can be suitable for driving the LED, the digital control circuit is used for providing driving signals for a constant-voltage module and a constant-current module, and more importantly, the digital control circuit is connected with a dimming signal input interface so that the digital control circuit can have dimming signals to a larger extent so as to control the constant-voltage power supply device or the constant-current power supply device.
Description
Technical field
The present invention relates to a kind of LED drive circuit, particularly a kind of LED drive circuit with PWM dimming interface.
Background technology
In known technology, PWM light adjusting circuit is the break-make utilizing pwm signal to control the power switch of LED lower end, to change average output current to realize the control to LED brightness.PWM light modulation, is utilize pwm signal to control the time ratio turned on and off of LED driver power switch to regulate average output current, thus realizes a kind of light-dimming method to the adjustment of LED light flux.PWM light modulation is that the method for the pulse-width modulation of the switch operating frequency being greater than 100Hz changes the pulse duty factor of LED drive current to realize the brightness adjustment control of LED, selects and is greater than 100Hz switch dimming control frequency mainly in order to avoid human eye perceives is to light modulation scintillation.Under the control of pwm signal, the luminosity of LED is proportional to the pulse duty factor of PWM.Under this dimming controlling method, the electric current flowing through LED is not straight direct current, but a pulse current, cause LED lamp to be glimmered, and driving power loss is large.
Summary of the invention
Technical problem to be solved by this invention is for the defect in aforementioned background art and deficiency, provides a kind of PWM dimming arrangement.
The present invention is for solving above technical problem, and the technical scheme adopted is:
A kind of LED drive device with PWM dimming interface, comprise alternating current and electric supply installation formation, electric supply installation comprises the constant voltage electric supply installation of front end and the constant current power supply installation of rear end, the input of constant voltage electric supply installation is connected to L and the N pole of alternating current, the output of constant voltage electric supply installation is connected with the input of constant current power supply installation, the output of constant current power supply installation exports and is connected to LED lamp, it is characterized in that:
Above-mentioned electric supply installation also comprises numerical control device, described numerical control device provides drive control signal for described constant current power supply installation and described constant voltage electric supply installation, numerical control device is connected with a dim signal input interface, accept dim signal, and provide drive singal for described constant current power supply installation.
Above-mentioned dim signal input interface receives external dimmer signal by a spacer assembly.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of embodiments of the invention.
Fig. 2 is the circuit diagram specifically implemented of Fig. 1 of the present invention.
Embodiment
Below with reference to accompanying drawing, technical scheme of the present invention is described in detail.
The input of the constant voltage electric supply installation 102 shown in Fig. 1 is connected to L and the N pole of alternating current 101, and export and be connected to constant current power supply installation 103, the output of constant current power supply installation 103 is connected to LED lamp 106, for it provides required direct current and voltage designated value.Aforementioned digital control device 104 adopts digital control chip, carries out digital communication with constant current power supply installation 103, controls the output current of constant current power supply installation 103 and the object of voltage to reach; Aforementioned digital control device 104 also carries out digital communication with constant voltage electric supply installation 102, to realize controlling the output voltage of constant voltage electric supply installation simultaneously.Aforementioned digital control device 104 is connected with a dim signal input interface, accepts dim signal.Numerical control device 104 controls the switching drive signal of constant voltage electric supply installation 102 and constant current power supply installation 103 according to the dim signal received, and more optimizedly controls the switching drive signal of constant current power supply installation 103.
The input of the constant voltage electric supply installation 202 shown in Fig. 2 is connected to L and the N pole of alternating current 201, and export and be connected to constant current power supply installation 203, the output of constant current power supply installation 203 is connected to LED lamp 206, for it provides required direct current and voltage designated value.Aforementioned digital control device 204 adopts digital control chip, carries out digital communication with constant current power supply installation 203, controls the output current of constant current power supply installation 203 and the object of voltage to reach; Aforementioned digital control device 204 also carries out digital communication with constant voltage electric supply installation 202, to realize controlling the output voltage of constant voltage electric supply installation simultaneously.Aforementioned digital control device 104 is connected with a dim signal input interface, accepts dim signal.Numerical control device 104 controls the switching drive signal of constant voltage electric supply installation 102 and constant current power supply installation 103 according to the dim signal received, more optimizedly the switching drive signal of constant current power supply installation 103 is controlled, spacer assembly 251 described here can be isolating transformer or optocoupler, also can be other similar spacer assemblys.
It should be noted that; the embodiment enumerated herein is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, every technological thought proposed according to the present invention; any change that technical scheme basis is done, all falls within scope.
Claims (2)
1. one kind has the LED drive device of PWM dimming interface, comprise alternating current and electric supply installation formation, electric supply installation comprises the constant voltage electric supply installation of front end and the constant current power supply installation of rear end, the input of constant voltage electric supply installation is connected to L and the N pole of alternating current, the output of constant voltage electric supply installation is connected with the input of constant current power supply installation, the output of constant current power supply installation exports and is connected to LED lamp, it is characterized in that:
Described electric supply installation also comprises numerical control device, described numerical control device provides drive control signal for described constant current power supply installation and described constant voltage electric supply installation, numerical control device is connected with a light modulation input interface, accept dim signal, and provide drive singal for described constant current power supply installation.
2. a kind of LED drive device with PWM dimming interface as claimed in claim 1, is characterized in that described light modulating device receives external dimmer signal by a spacer assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410848622.XA CN104582172A (en) | 2014-12-24 | 2014-12-24 | LED driving circuit with PWM dimming interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410848622.XA CN104582172A (en) | 2014-12-24 | 2014-12-24 | LED driving circuit with PWM dimming interface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104582172A true CN104582172A (en) | 2015-04-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410848622.XA Pending CN104582172A (en) | 2014-12-24 | 2014-12-24 | LED driving circuit with PWM dimming interface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104582172A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111263490A (en) * | 2018-11-30 | 2020-06-09 | 松下知识产权经营株式会社 | Load controller |
-
2014
- 2014-12-24 CN CN201410848622.XA patent/CN104582172A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111263490A (en) * | 2018-11-30 | 2020-06-09 | 松下知识产权经营株式会社 | Load controller |
| CN111263490B (en) * | 2018-11-30 | 2022-03-29 | 松下知识产权经营株式会社 | Load controller |
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| C06 | Publication | ||
| PB01 | Publication | ||
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Gao Xinyong Document name: Notification of before Expiration of Request of Examination as to Substance |
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| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Gao Xinyong Document name: Notification that Application Deemed to be Withdrawn |
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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150429 |