CN203554729U - LED drive light modulation circuit - Google Patents

LED drive light modulation circuit Download PDF

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Publication number
CN203554729U
CN203554729U CN201320581870.3U CN201320581870U CN203554729U CN 203554729 U CN203554729 U CN 203554729U CN 201320581870 U CN201320581870 U CN 201320581870U CN 203554729 U CN203554729 U CN 203554729U
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CN
China
Prior art keywords
circuit
led
switch
brightness
comparator
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Withdrawn - After Issue
Application number
CN201320581870.3U
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Chinese (zh)
Inventor
楼俊山
沈锦祥
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Zhejiang Shenghui Lighting Co Ltd
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Zhejiang Shenghui Lighting Co Ltd
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Priority to CN201320581870.3U priority Critical patent/CN203554729U/en
Application granted granted Critical
Publication of CN203554729U publication Critical patent/CN203554729U/en
Withdrawn - After Issue legal-status Critical Current
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Abstract

The utility model discloses an LED drive light modulation circuit which is used for driving an LED lighting device. The LED drive light modulation circuit comprises an AC (alternating-current) power supply, a switch connected with the AC power supply, an LED drive circuit connected with the switch, a switch state detection circuit connected with the switch, and an LED brightness selection circuit, wherein one end of the LED brightness selection circuit is connected with the switch state detection circuit and the other end is connected with the LED drive circuit. The switch state detection circuit is used for detecting whether the switch is open or closed and outputting the detected result to the LED brightness selection circuit. An output of the LED brightness selection circuit is connected with the LED drive circuit. The LED drive circuit, according to the result of the LED brightness selection circuit, controls the brightness of the LED lighting device. According to the LED drive light modulation circuit, the switch state detection circuit and the LED brightness selection circuit which are composed of discrete components are added to an conventional LED drive circuit and have little changes on the original circuit; the newly added circuit is relatively low in cost; therefore, the utilization cost of the LED lighting device can be reduced.

Description

LED drives light adjusting circuit
Technical field
The utility model relates to LED lighting technical field, and particularly a kind of LED drives light adjusting circuit.
Background technology
LED due to have energy-saving and environmental protection, can be light-operated, the lot of advantages such as solidification, long-life, in the today of advocating low-carbon (LC) life, be widely used in various lighting fields.
In the prior art, the holder structure of LED lamp is generally designed to the holder structure identical with original illuminating lamp such as incandescent lamp, electricity-saving lamp, LED lamp directly can be replaced like this to original illuminating lamp, is not only convenient to install, and does not change the structure of original illuminator.But LED lamp is directly replaced after original illuminating lamp, the dimming function of the LED lamp after replacement cannot be brought into play, if LED lamp is carried out to light modulation, must in original illuminator, access in addition dimmer, due to the purchase of dimmer with install and need to increase extra cost, on market, produced the demand that substitutes dimmer and come adjusting brightness of LED lamps with regular tap.
When carrying out light modulation with regular tap, dimming mode mainly contains two kinds, first kind of way adopts stepless dimming, and user can select brightness arbitrarily, when user presses switch for the first time, lamp is gradient to high-high brightness from minimum brightness, this process can be lasted several seconds, if in this process, user presses switch for the second time, lamp goes out, but brightness meeting is now remembered.When pressing switch for the third time to user, lamp is luminous with the brightness of remembering before.When pressing switch the 4th time, lamp goes out.Before can repeating by switch more afterwards, for the first time by the process of switch, if pressed after switch for the first time, lamp is gradient to this process of high-high brightness from minimum brightness, does not press switch, and lamp is with high-high brightness work.
The second way is user's selection that circulates in the brightness of several settings, and the dimming mode of the second way is take two-stage light modulation process as example, that is:, when pressing switch for the first time, lamp is worked with the first setting brightness, and when pressing switch for the second time, lamp goes out; When pressing switch for the third time, lamp is with the brightness work of the second setting; When pressing switch the 4th time, lamp goes out.Press after switch for the 5th time, lamp with the first setting brightness work, as for the first time, so circulates again.
At present, existing common way is to adopt special light modulation chip, or coordinates to realize brightness selection function with MCU, and such design is very large to the change of original circuit, and complex circuit, thereby has increased the use cost of LED lamp.
Summary of the invention
The utility model has overcome above-mentioned the deficiencies in the prior art, provides a kind of the relatively low LED of the little and newly-increased line cost of the change of original circuit is driven to light adjusting circuit.
To achieve these goals, the technical solution adopted in the utility model is such:
A kind of LED drives light adjusting circuit, for driving LED lighting device, described LED drives light adjusting circuit to comprise: AC power, the switch being connected with described AC power, the LED drive circuit being connected with described switch, circuit is selected in the switch condition detection circuit being connected with described switch and LED brightness, described LED brightness selects one end of circuit to be connected with switch condition detection circuit, the other end is connected with LED drive circuit, wherein, switch condition detection circuit is to disconnect or closure for detection of switch, and export the result detecting to LED brightness selection circuit, LED brightness selects the output of circuit to connect LED drive circuit, LED drive circuit selects the result of circuit to control the brightness of LED lighting device according to LED brightness.
As preferably, described switch condition detection circuit comprises first, second comparator and the first electric capacity, and the output of described the first comparator is connected to the input of the second comparator, and first electric capacity one end is connected to the output of the first comparator, other end ground connection.
As preferably, described LED brightness selects circuit to comprise latching circuit and second electric capacity in parallel with latching circuit.
As preferably, described latching circuit comprises first, second transistor and first, second, third, fourth resistance of series connection.
As preferably, described switch condition detection circuit comprises the first and second comparators.
As preferably, described LED brightness selects circuit to comprise T ' counter, and the output of described the first comparator is connected to the CP end of T ' counter, and the output of described the second comparator is connected to the reset terminal of T ' counter.
Compared to prior art, the utility model is on the basis of original LED drive circuit, to increase the switch condition detection circuit and the LED brightness that discrete component, consist of to select circuit, change to original circuit is little, and newly-increased line cost is relatively low, thereby can reduce the use cost of LED lighting device.
Accompanying drawing explanation
Fig. 1 is the schematic block diagram that the utility model LED drives light adjusting circuit;
Fig. 2 is that the utility model LED drives switch condition detection circuit and LED brightness in light adjusting circuit to select the circuit diagram of circuit the first embodiment;
Fig. 3 is that the utility model LED drives switch condition detection circuit and LED brightness in light adjusting circuit to select the circuit diagram of circuit the second embodiment.
Embodiment
Embodiment of the present utility model is as follows:
Embodiment 1: Fig. 1 is the schematic block diagram that the utility model LED drives light adjusting circuit, as shown in Figure 1, the utility model LED drives light adjusting circuit for driving LED lighting device 6, described LED drives light adjusting circuit to comprise AC power 1, switch 2, LED drive circuit 3, circuit 5 is selected in switch condition detection circuit 4 and LED brightness, wherein, AC power 1, switch 2 and LED drive circuit 3 are control structures of existing LED lighting device in the market, LED of the present utility model drives the main utility model point of light adjusting circuit to be switch condition detection circuit 4 and LED brightness selection circuit 5.Switch condition detection circuit 4 is to disconnect or closure for detection of switch 2, and the result detecting is outputed to LED brightness selection circuit 5, LED brightness selects the output of circuit 5 to be connected to LED drive circuit 3, and LED drive circuit 3 selects the result of circuit 5 to control the brightness of LED lighting device 6 according to LED brightness.
Fig. 2 is that the utility model LED drives switch condition detection circuit 4 in light adjusting circuit and LED brightness to select the circuit diagram of circuit 5 first embodiment, as shown in Figure 2, switch condition detection circuit 4 comprises first, second comparator 41,42 and the first electric capacity 43, the output of described the first comparator 41 is connected to the input of the second comparator 42, first electric capacity 43 one end are connected to the output of the first comparator 41, other end ground connection.LED brightness selects circuit 5 to comprise latching circuit 51 and second electric capacity 52 in parallel with latching circuit 51, and this known latching circuit 51 comprises first, second transistor 53,54 and first, second, third, fourth resistance 55,56,57,58 of series connection.Wherein, the first transistor 53 is PNP transistor, transistor seconds 54 is NPN transistor, the first transistor 53 and the 3rd resistance 57, the 4th resistance 58 are cascaded, transistor seconds 54 and the second resistance 56, the first resistance 55 are cascaded, the collector electrode of the first transistor 53 is connected with the 3rd resistance 57, the emitter of the first transistor 53 is connected with the two ends of the first resistance 55 respectively with base stage, the collector electrode of transistor seconds 54 is connected with the second resistance 56, and the base stage of transistor seconds 54 is connected with the two ends of the 4th resistance 58 respectively with emitter.
When pressing for the first time switch 2, switch 2 closes, A point voltage VA is high level, be greater than Vref, it is low level that the first comparator 41 is exported VB, and it is also low level that the second comparator 42 is exported, latching circuit 51 is failure to actuate, VC is high level, when LED drive circuit 3 receives the VC of high level, with the first setting brightness work.While pressing switch 2 for the second time, switch 2 disconnects, A point voltage declines, when VA is during lower than reference voltage Vref, the first comparator 41 is exported VB and is uprised level, after Td time delay, on the first electric capacity 43, current potential Vc1 is higher than Vref, the second comparator 42 outputs uprise, and trigger latching circuit 51, and VC becomes low level from high level.Latching circuit 51 is powered by the second electric capacity 52, and after the TL time, the second electric capacity 52 electric weight exhaust, and latching circuit 51 resets.If press switch 2 for the third time within the TL time, LED drive circuit 3 receives low level VC, with the second setting brightness work.If press switch 2 for the third time after the TL time, because latching circuit 51 resets, VC is high level, and LED drive circuit 3 is worked with the first setting brightness.In like manner, if at the 4th time by switch 2 be less than TL by the time interval of switch 2 the 5th time, LED drive circuit 3 is worked with the second setting brightness, if be greater than TL, with the first setting brightness work.Td, TL time are to represent the random time that can arrange according to actual needs.
Embodiment 2: Fig. 3 is that the utility model LED drives switch condition detection circuit in light adjusting circuit and LED brightness to select the circuit diagram of circuit the second embodiment, the circuit connection structure of the each assembly of the present embodiment is as the criterion with Fig. 3, as shown in Figure 3, switch condition detection circuit 4a mainly comprises first, second comparator 41a, 42a and the first electric capacity 43a, the 5th resistance 44a; One end of the first electric capacity 43a is connected with the power supply of first, second comparator 41a, 42a, the other end ground connection of the first electric capacity 43a, and by the 5th resistance 44a, be connected between the other end of the first electric capacity 43a and the in-phase input end of the second comparator 42a.LED brightness selects circuit 5a to comprise T ' counter, and the output of described the first comparator 41a is connected to the CP end of T ' counter, and the output of described the second comparator 42a is connected to the reset terminal of T ' counter.
When pressing for the first time switch 2, switch closes, the first electric capacity 43a charging, and when the upper voltage Vr3 of the 5th resistance 44a is during lower than Vref, the second comparator 42 is output as low level, and T ' counter resets.After Vr3 is higher than Vref, the second comparator 42a is output as high level afterwards.When A point voltage VA is greater than Vref, the first comparator 41a output VB is low level, and the second comparator 42a output is also high level, T ' counter is failure to actuate, and maintains initial condition, and now VC is high level, when LED drive circuit 3 receives the VC of high level, with the first setting brightness work.While pressing switch 2 for the second time, switch 2 disconnects, and A point voltage declines, and when VA is during lower than reference voltage Vref, the first comparator 41a output VB uprises level, after Td time delay, and T ' counter rollover, VC becomes low level from high level.From starting timing by switch 2 for the second time, after the TL time, the first electric capacity 43a declines, and when the upper voltage Vr3 of the first resistance 44a is less than Vref, the second comparator 42a output becomes low level from high level, and T ' counter will reset.If press switch 2 for the third time within the TL time, LED drive circuit 3 receives low level VC, with the second setting brightness work.In like manner, after pressing switch 2 the 4th time, the first comparator 41a output high level, T ' counter rollover, VC becomes high level from low level.If press time interval between switch for the 4th time and the 5th time in TL, LED drive circuit will be with the first setting brightness work.Like this, LED drive circuit can periodic duty between two kinds of brightness.If but after the TL time, press switch for the third time, because T ' counter resets, VC is high level, LED drive circuit 3 will be with the first setting brightness work.
The utility model preferred embodiment is just for helping to set forth the utility model.Preferred embodiment does not have all details of detailed descriptionthe, and also not limiting this utility model is only described embodiment.Obviously, according to the content of this specification, can make many modifications and variations.These embodiment are chosen and specifically described to this specification, is in order to explain better principle of the present utility model and practical application, thereby under making, technical field technical staff can utilize the utility model well.The utility model is only subject to the restriction of claims and four corner and equivalent.Disclosed is above only several specific embodiments of the application, but the application is not limited thereto, and the changes that any person skilled in the art can think of, all should drop in the application's protection range.

Claims (6)

1. a LED drives light adjusting circuit, for driving LED lighting device, it is characterized in that: described LED drives light adjusting circuit to comprise: AC power, the switch being connected with described AC power, the LED drive circuit being connected with described switch, circuit is selected in the switch condition detection circuit being connected with described switch and LED brightness, described LED brightness selects one end of circuit to be connected with switch condition detection circuit, the other end is connected with LED drive circuit, wherein, switch condition detection circuit is to disconnect or closure for detection of switch, and export the result detecting to LED brightness selection circuit, LED brightness selects the output of circuit to connect LED drive circuit, LED drive circuit selects the result of circuit to control the brightness of LED lighting device according to LED brightness.
2. LED according to claim 1 drives light adjusting circuit, it is characterized in that: described switch condition detection circuit comprises first, second comparator and the first electric capacity, the output of described the first comparator is connected to the input of the second comparator, first electric capacity one end is connected to the output of the first comparator, other end ground connection.
3. LED according to claim 2 drives light adjusting circuit, it is characterized in that: described LED brightness selects circuit to comprise latching circuit and second electric capacity in parallel with latching circuit.
4. LED according to claim 3 drives light adjusting circuit, it is characterized in that: described latching circuit comprises first, second transistor and first, second, third, fourth resistance of series connection.
5. LED according to claim 1 drives light adjusting circuit, it is characterized in that: described switch condition detection circuit comprises the first and second comparators.
6. LED according to claim 5 drives light adjusting circuit, it is characterized in that: described LED brightness selects circuit to comprise T ' counter, the output of described the first comparator is connected to the CP end of T ' counter, and the output of described the second comparator is connected to the reset terminal of T ' counter.
CN201320581870.3U 2013-09-18 2013-09-18 LED drive light modulation circuit Withdrawn - After Issue CN203554729U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201320581870.3U CN203554729U (en) 2013-09-18 2013-09-18 LED drive light modulation circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201320581870.3U CN203554729U (en) 2013-09-18 2013-09-18 LED drive light modulation circuit

Publications (1)

Publication Number Publication Date
CN203554729U true CN203554729U (en) 2014-04-16

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Application Number Title Priority Date Filing Date
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Country Status (1)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103533705A (en) * 2013-09-18 2014-01-22 浙江生辉照明有限公司 LED (Light Emitting Diode) driving and dimming circuit
CN106550515A (en) * 2015-09-19 2017-03-29 卢志勇 A kind of intelligent dimming ager and light modulation shading process

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103533705A (en) * 2013-09-18 2014-01-22 浙江生辉照明有限公司 LED (Light Emitting Diode) driving and dimming circuit
WO2015039561A1 (en) * 2013-09-18 2015-03-26 Zhejiang Shenghui Lighting Co., Ltd Led driving and dimming circuit and configuration method
US9161412B2 (en) 2013-09-18 2015-10-13 Zhejiang Shenghu Lighting Co., Ltd. LED driving and dimming circuit and configuration method
CN103533705B (en) * 2013-09-18 2015-12-02 浙江生辉照明有限公司 LED drives light adjusting circuit
CN106550515A (en) * 2015-09-19 2017-03-29 卢志勇 A kind of intelligent dimming ager and light modulation shading process

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C14 Grant of patent or utility model
AV01 Patent right actively abandoned

Granted publication date: 20140416

Effective date of abandoning: 20151202

C25 Abandonment of patent right or utility model to avoid double patenting