CN203748073U - LED current ripple suppression circuit and LED light-emitting device - Google Patents
LED current ripple suppression circuit and LED light-emitting device Download PDFInfo
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- CN203748073U CN203748073U CN201420094008.4U CN201420094008U CN203748073U CN 203748073 U CN203748073 U CN 203748073U CN 201420094008 U CN201420094008 U CN 201420094008U CN 203748073 U CN203748073 U CN 203748073U
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- inhibition circuit
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Abstract
The utility model belongs to the technical field of LED control and provides an LED current ripple suppression circuit and an LED light-emitting device. The LED current ripple suppression circuit comprises a first resistor R1, a first capacitor C1, a second resistor R2 and an NMOS tube M1, the structure is simple and the cost is low. The NMOS tube M1 works at a saturation area, and the first resistor R1, the first capacitor C1 and the second resistor R2 carry out filter processing on voltage ripples of the gate of the NMOS tube M1. Therefore, current ripples of the drain of the NMOS tube M1 can be reduced, current ripples flowing through an LED load can be effectively reduced, the purpose of no strobe lighting of the LED can be achieved, and the problem that current ripples can not be effectively eliminated in the prior LED current ripple elimination driving circuit and thus no strobe of the LED can not be realized can be solved.
Description
Technical field
The utility model belongs to LED control technology field, relates in particular to a kind of LED current ripple inhibition circuit and LED light-emitting device.
Background technology
At present, the LED constant current control program that realizes High Power Factor can be divided into has power frequency flicker (abbreviation stroboscopic) scheme and without power frequency flicker (being called for short without stroboscopic) scheme.
Wherein, for the LED constant current control program that has stroboscopic, its peripheral circuit is simple, and system Material Cost is lower.But study, show, the stroboscopic of LED lamp can cause very large injury to human eye, so, if this type of scheme wants to alleviate stroboscopic, need to increase input capacitance or output filter capacitor.If increase input capacitance, the sacrifice High Power Factor of take is often cost, and the effect that stroboscopic alleviates is better, and power factor can be lower; If increase output filter capacitor, although can alleviate the stroboscopic of LED lamp, can not fundamentally solve stroboscopic problem, and also can increase system Material Cost, also just make this type of scheme lose low-cost advantage.
For the LED constant current control program without stroboscopic, although it is without stroboscopic, but peripheral circuit is complicated, system Material Cost is high, and PCB layout is difficulty comparatively, without the controller of the LED constant-current control circuit of stroboscopic is inner, need integrated two cover modulation circuits, and then cause the control circuit of controller inside complicated, the cost of controller is higher than the conventional PFC chip that possesses High Power Factor, thereby system Material Cost is increased.
The stroboscopic and the Cost Problems that for the LED constant current control program that possesses High Power Factor, exist, prior art has proposed a kind of solution as shown in Figure 1, ripple in the electric current that its LED constant-current control circuit that adopts 10 pairs of a drive circuit of LED current ripples elimination based on triode to possess High Power Factor is exported carries out filtering processing to reach the object of eliminating stroboscopic, this method can be reduced to certain scope to alleviate stroboscopic by the ripple of output current, but capacitor C 1 needs to adopt high withstand voltage electric capacity, its cost is high, and this circuit is not good enough for the eradicating efficacy of current ripples, cannot effectively eliminate current ripples to reach LED without the object of stroboscopic.
In sum, existing LED current ripples is eliminated drive circuit cannot effectively to eliminate current ripples high without stroboscopic and cost to realize.
Utility model content
The purpose of this utility model is to provide a kind of LED current ripple inhibition circuit, is intended to solve existing LED current ripples and eliminates the existing current ripples of cannot effectively eliminating of drive circuit to realize LED without stroboscopic and the high problem of cost.
The utility model is to realize like this, a kind of LED current ripple inhibition circuit, be connected with constant-current control circuit and LED load, the current output terminal of described constant-current control circuit connects the input of described LED load, and the input of described LED current ripple inhibition circuit is connected respectively the output of described LED load and the loop end of described constant-current control circuit with output;
Described LED current ripple inhibition circuit comprises the first resistance R 1, the first capacitor C 1, the second resistance R 2 and NMOS pipe M1; The common contact of the drain electrode of the first end of described the first resistance R 1 and described NMOS pipe M1 is the input of described LED current ripple inhibition circuit, the second end of the first end of described the first capacitor C 1 and described the first resistance R 1 and the first end of described the second resistance R 2 are connected to the grid of described NMOS pipe M1 altogether, and it is the output of described LED current ripple inhibition circuit that the second end of the described NMOS pipe source electrode of M1 and the second end of described the second resistance R 2 and described the first capacitor C 1 connects formed contact altogether altogether; Described NMOS pipe M1 works in saturation region, and the grid voltage ripple of managing M1 by described the first resistance R 1, described the first capacitor C 1 and 2 couples of described NMOS of described the second resistance R carries out filtering processing so that described NMOS pipe M1 reduces the current ripples of its drain electrode.
Another object of the present utility model is also to provide a kind of LED light-emitting device, and described LED light-emitting device comprises constant-current control circuit, LED load and above-mentioned LED current ripple inhibition circuit.
The utility model comprises the first resistance R 1 by employing, the first capacitor C 1, the LED current ripple inhibition circuit of the second resistance R 2 and NMOS pipe M1, it is simple in structure and cost is low, NMOS pipe M1 works in saturation region, and by the first resistance R 1, the grid voltage ripple of 2 couples of NMOS pipe M1 of the first capacitor C 1 and the second resistance R carries out filtering processing so that described NMOS pipe M1 reduces the current ripples of its drain electrode, and then effectively reduce to flow through the current ripples of LED load, thereby reach LED without the object of strobe light emission, solve existing LED current ripples and eliminated the existing current ripples of cannot effectively eliminating of drive circuit to realize LED without the problem of stroboscopic.
Accompanying drawing explanation
Fig. 1 is the structure chart that the LED current ripples that provides of prior art is eliminated drive circuit;
Fig. 2 is the structure chart of the LED current ripple inhibition circuit that provides of the utility model embodiment;
Fig. 3 is another structure chart of the LED current ripple inhibition circuit that provides of the utility model embodiment;
Fig. 4 is the structure chart of the LED current ripple inhibition circuit that comprise clamper module corresponding with Fig. 2;
Fig. 5 is the structure chart of the LED current ripple inhibition circuit that comprise clamper module corresponding with Fig. 3;
Fig. 6 is another structure chart of the LED current ripple inhibition circuit that comprise clamper module corresponding with Fig. 2;
Fig. 7 is another structure chart of the LED current ripple inhibition circuit that comprise clamper module corresponding with Fig. 3.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Fig. 2 shows the structure of the LED current ripple inhibition circuit that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant to the utility model embodiment, and details are as follows:
The LED current ripple inhibition circuit 100 that the utility model embodiment provides is connected with constant-current control circuit 200 and LED load 300, the input of current output terminal+connection LED load 300 of constant-current control circuit 200, the input of LED current ripple inhibition circuit 100 is connected respectively the output of LED load 300 and the loop end of constant-current control circuit 200 with output.Wherein, constant-current control circuit 200 is the LED constant-current control circuits that possess High Power Factor, and LED load 300 is the LED modules that comprise one or more LED.
LED current ripple inhibition circuit 100 comprises the first resistance R 1, the first capacitor C 1, the second resistance R 2 and NMOS pipe M1; The common contact of the drain electrode of the first end of the first resistance R 1 and NMOS pipe M1 is the input of LED current ripple inhibition circuit 100, the second end of the first end of the first capacitor C 1 and the first resistance R 1 and the first end of the second resistance R 2 are connected to the grid of NMOS pipe M1 altogether, and it is the output of LED current ripple inhibition circuit 100 that the second end of the NMOS pipe source electrode of M1 and the second end of the second resistance R 2 and the first capacitor C 1 connects formed contact altogether altogether; NMOS pipe M1 works in saturation region, and the grid voltage ripple of being managed M1 by the first resistance R 1, the first capacitor C 1 and 2 couples of NMOS of the second resistance R carries out filtering processing so that NMOS pipe M1 reduces the current ripples of its drain electrode.
Wherein, NMOS pipe M1 works in saturation region, and the grid-source voltage of managing M1 at NMOS (is V
gS) fixedly time, its drain current can (be not V with drain electrode-source voltage
dS) change, the grid voltage ripple of NMOS being managed to M1 by the first resistance R 1, the first capacitor C 1 and the second resistance R 2 carries out filtering to reduce voltage ripple, the current ripples that can driving N metal-oxide-semiconductor M1 reduces its drain electrode, and then the current ripples that flows through LED load is reduced, thereby realize LED without the object of strobe light emission.In the above-mentioned process that reduces current ripples, V
dSborn the voltage ripple of the grid of NMOS pipe M1, its power of bearing voltage ripple is consumed by NMOS pipe M1.
In order to make the current ripples eradicating efficacy of LED current ripple inhibition circuit 100 better, and reduce as much as possible to flow through the current ripples of LED load 300, LED current ripple inhibition circuit 100 also can further comprise the 3rd resistance R 3, as shown in Figure 3, the 3rd resistance R 3 is connected between the NMOS pipe source electrode of M1 and the second end of the second resistance R 2.By the 3rd resistance R 3, can produce a negative feedback regulating for electric current, thereby current ripples is reduced to close to zero, greatly promote the current ripples filtration result of LED current ripple inhibition circuit 100.
In addition, for the LED current ripple inhibition circuit 100 shown in Fig. 2 and Fig. 3, in order to make LED current ripple inhibition circuit 100 start to carry out current ripples filtering operation fast, and reduce the power consumption of NMOS pipe M1, as shown in Fig. 4 (corresponding diagram 2) and Fig. 5 (corresponding diagram 3), LED current ripple inhibition circuit 100 also can further comprise clamper module 101, and clamper module 101 comprises the 4th resistance R 4, the 5th resistance R 5 and positive-negative-positive triode Q1; The emitter of the first end of the 4th resistance R 4 and positive-negative-positive triode Q1 is connected to the output of LED load 300 altogether, the second end of the 4th resistance R 4 and the first end of the 5th resistance R 5 are connected to the base stage of positive-negative-positive triode Q1 altogether, and the second end of the collector electrode of positive-negative-positive triode Q1 and the 5th resistance R 5 is connected respectively first end and second end of the first capacitor C 1.Wherein, adopt above-mentioned clamper module, can be when circuit start by positive-negative-positive triode Q1 to the first capacitor C 1 quick charge to reach the object of quick startup LED current ripple inhibition circuit 100, and can realize voltage clamping and control that the drain voltage of NMOS pipe M1 is limited, thereby the object that reaches the power consumption that reduces NMOS pipe M1, the resistance of adjusting the 4th resistance R 4 and the 5th resistance R 5 can regulate the size of clamp voltage.
In other embodiment of the utility model, as shown in Fig. 6 (corresponding diagram 2) and Fig. 7 (corresponding diagram 3), clamper module 101 can also comprise the 6th resistance R 6, the 7th resistance R 7, PMOS pipe M2 and diode D1; The source electrode of the first end of the 6th resistance R 6 and PMOS pipe M2 is connected to the output of LED load 300 altogether, the second end of the 6th resistance R 6 and the first end of the 7th resistance R 7 are connected to the grid of PMOS pipe M2 altogether, the drain electrode of PMOS pipe M2 connects the anode of diode D1, and the second end of the negative electrode of diode D1 and the 7th resistance R 7 is connected respectively first end and second end of the first capacitor C 1.Wherein, the combination of PMOS pipe M2 and diode D1 is identical with the function of above-mentioned positive-negative-positive triode Q1, therefore repeats no more.
For the LED current ripple inhibition circuit 100 shown in Fig. 2 to Fig. 7, in practical application, both can adopt above-mentioned each discrete component to build, also can adopt CMOS technique that all components and parts except the first capacitor C 1 are integrated in a chip, with the form of integrated circuit and the LED constant-current control circuit with High Power Factor, be combined into and possess the LED Constant Current Control System that drives function without stroboscopic.
LED current ripple inhibition circuit 100 based on above-mentioned, the utility model embodiment also provides a kind of LED light-emitting device, and it comprises constant-current control circuit 200, LED load 300 and above-mentioned LED current ripple inhibition circuit 100.
The utility model embodiment comprises the first resistance R 1 by employing, the first capacitor C 1, the LED current ripple inhibition circuit 100 of the second resistance R 2 and NMOS pipe M1, it is simple in structure and cost is low, NMOS pipe M1 works in saturation region, and by the first resistance R 1, the grid voltage ripple of 2 couples of NMOS pipe M1 of the first capacitor C 1 and the second resistance R carries out filtering processing so that described NMOS pipe M1 reduces the current ripples of its drain electrode, and then effectively reduce to flow through the current ripples of LED load 300, thereby reach LED without the object of strobe light emission, solve existing LED current ripples and eliminated the existing current ripples of cannot effectively eliminating of drive circuit to realize LED without the problem of stroboscopic.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (8)
1. a LED current ripple inhibition circuit, it is characterized in that, described LED current ripple inhibition circuit is connected with constant-current control circuit and LED load, the current output terminal of described constant-current control circuit connects the input of described LED load, and the input of described LED current ripple inhibition circuit is connected respectively the output of described LED load and the loop end of described constant-current control circuit with output;
Described LED current ripple inhibition circuit comprises the first resistance R 1, the first capacitor C 1, the second resistance R 2 and NMOS pipe M1; The common contact of the drain electrode of the first end of described the first resistance R 1 and described NMOS pipe M1 is the input of described LED current ripple inhibition circuit, the second end of the first end of described the first capacitor C 1 and described the first resistance R 1 and the first end of described the second resistance R 2 are connected to the grid of described NMOS pipe M1 altogether, and it is the output of described LED current ripple inhibition circuit that the second end of the described NMOS pipe source electrode of M1 and the second end of described the second resistance R 2 and described the first capacitor C 1 connects formed contact altogether altogether; Described NMOS pipe M1 works in saturation region, and the grid voltage ripple of managing M1 by described the first resistance R 1, described the first capacitor C 1 and 2 couples of described NMOS of described the second resistance R carries out filtering processing so that described NMOS pipe M1 reduces the current ripples of its drain electrode.
2. LED current ripple inhibition circuit as claimed in claim 1, is characterized in that, described LED current ripple inhibition circuit also comprises the 3rd resistance R 3, and described the 3rd resistance R 3 is connected between the described NMOS pipe source electrode of M1 and the second end of described the second resistance R 2.
3. LED current ripple inhibition circuit as claimed in claim 1 or 2, is characterized in that, described LED current ripple inhibition circuit also comprises clamper module,
Described clamper module comprises the 4th resistance R 4, the 5th resistance R 5 and positive-negative-positive triode Q1; The emitter of the first end of described the 4th resistance R 4 and described positive-negative-positive triode Q1 is connected to the output of described LED load altogether, the second end of described the 4th resistance R 4 and the first end of described the 5th resistance R 5 are connected to the base stage of described positive-negative-positive triode Q1 altogether, and the second end of the collector electrode of described positive-negative-positive triode Q1 and described the 5th resistance R 5 is connected respectively first end and second end of described the first capacitor C 1.
4. LED current ripple inhibition circuit as claimed in claim 1 or 2, is characterized in that, described LED current ripple inhibition circuit also comprises clamper module, and described clamper module comprises the 6th resistance R 6, the 7th resistance R 7, PMOS pipe M2 and diode D1;
The source electrode of the first end of described the 6th resistance R 6 and described PMOS pipe M2 is connected to the output of described LED load altogether, the second end of described the 6th resistance R 6 and the first end of described the 7th resistance R 7 are connected to the grid of described PMOS pipe M2 altogether, the drain electrode of described PMOS pipe M2 connects the anode of described diode D1, and the second end of the negative electrode of described diode D1 and described the 7th resistance R 7 is connected respectively first end and second end of described the first capacitor C 1.
5. a LED light-emitting device, comprise constant-current control circuit and LED load, it is characterized in that, described LED light-emitting device also comprises LED current ripple inhibition circuit, described LED current ripple inhibition circuit is connected with described constant-current control circuit and described LED load, the current output terminal of described constant-current control circuit connects the input of described LED load, and the input of described LED current ripple inhibition circuit is connected respectively the output of described LED load and the loop end of described constant-current control circuit with output;
Described LED current ripple inhibition circuit comprises the first resistance R 1, the first capacitor C 1, the second resistance R 2 and NMOS pipe M1; The common contact of the drain electrode of the first end of described the first resistance R 1 and described NMOS pipe M1 is the input of described LED current ripple inhibition circuit, the second end of the first end of described the first capacitor C 1 and described the first resistance R 1 and the first end of described the second resistance R 2 are connected to the grid of described NMOS pipe M1 altogether, and it is the output of described LED current ripple inhibition circuit that the second end of the described NMOS pipe source electrode of M1 and the second end of described the second resistance R 2 and described the first capacitor C 1 connects formed contact altogether altogether; Described NMOS pipe M1 works in saturation region, and the grid voltage ripple of managing M1 by described the first resistance R 1, described the first capacitor C 1 and 2 couples of described NMOS of described the second resistance R carries out filtering processing so that described NMOS pipe M1 reduces the current ripples of its drain electrode.
6. LED light-emitting device as claimed in claim 5, is characterized in that, described LED current ripple inhibition circuit also comprises the 3rd resistance R 3, and described the 3rd resistance R 3 is connected between the described NMOS pipe source electrode of M1 and the second end of described the second resistance R 2.
7. the LED light-emitting device as described in claim 5 or 6, is characterized in that, described LED current ripple inhibition circuit also comprises clamper module,
Described clamper module comprises the 4th resistance R 4, the 5th resistance R 5 and positive-negative-positive triode Q1; The emitter of the first end of described the 4th resistance R 4 and described positive-negative-positive triode Q1 is connected to the output of described LED load altogether, the second end of described the 4th resistance R 4 and the first end of described the 5th resistance R 5 are connected to the base stage of described positive-negative-positive triode Q1 altogether, and the second end of the collector electrode of described positive-negative-positive triode Q1 and described the 5th resistance R 5 is connected respectively first end and second end of described the first capacitor C 1.
8. the LED light-emitting device as described in claim 5 or 6, is characterized in that, described LED current ripple inhibition circuit also comprises clamper module, and described clamper module comprises the 6th resistance R 6, the 7th resistance R 7, PMOS pipe M2 and diode D1;
The source electrode of the first end of described the 6th resistance R 6 and described PMOS pipe M2 is connected to the output of described LED load altogether, the second end of described the 6th resistance R 6 and the first end of described the 7th resistance R 7 are connected to the grid of described PMOS pipe M2 altogether, the drain electrode of described PMOS pipe M2 connects the anode of described diode D1, and the second end of the negative electrode of described diode D1 and described the 7th resistance R 7 is connected respectively first end and second end of described the first capacitor C 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420094008.4U CN203748073U (en) | 2014-03-03 | 2014-03-03 | LED current ripple suppression circuit and LED light-emitting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420094008.4U CN203748073U (en) | 2014-03-03 | 2014-03-03 | LED current ripple suppression circuit and LED light-emitting device |
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| CN203748073U true CN203748073U (en) | 2014-07-30 |
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| CN201420094008.4U Expired - Fee Related CN203748073U (en) | 2014-03-03 | 2014-03-03 | LED current ripple suppression circuit and LED light-emitting device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103889113A (en) * | 2014-03-03 | 2014-06-25 | 深圳市明微电子股份有限公司 | LED current ripple eliminating circuit and LED lighting device |
| CN105898938A (en) * | 2014-11-24 | 2016-08-24 | 李顺华 | Driving circuit of ballast type LED lamp |
| CN106774577A (en) * | 2016-12-30 | 2017-05-31 | 北京华大九天软件有限公司 | A kind of power supply circuit for improving PSRR |
| CN110381639A (en) * | 2019-07-26 | 2019-10-25 | 帝奥微电子有限公司 | For eliminating the control circuit and method of LED ripple current |
| WO2020073359A1 (en) * | 2018-10-11 | 2020-04-16 | 忆云有限公司 | Design of dimmable, color adjustable and flicker-free downlight circuit |
| CN112748756A (en) * | 2020-12-18 | 2021-05-04 | 珠海格力电器股份有限公司 | Power supply voltage ripple suppression method, device and control circuit |
| CN110381639B (en) * | 2019-07-26 | 2024-04-26 | 江苏帝奥微电子股份有限公司 | Control circuit and method for eliminating LED ripple current |
-
2014
- 2014-03-03 CN CN201420094008.4U patent/CN203748073U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103889113A (en) * | 2014-03-03 | 2014-06-25 | 深圳市明微电子股份有限公司 | LED current ripple eliminating circuit and LED lighting device |
| CN103889113B (en) * | 2014-03-03 | 2017-01-25 | 深圳市明微电子股份有限公司 | LED current ripple eliminating circuit and LED lighting device |
| CN105898938A (en) * | 2014-11-24 | 2016-08-24 | 李顺华 | Driving circuit of ballast type LED lamp |
| CN106774577A (en) * | 2016-12-30 | 2017-05-31 | 北京华大九天软件有限公司 | A kind of power supply circuit for improving PSRR |
| WO2020073359A1 (en) * | 2018-10-11 | 2020-04-16 | 忆云有限公司 | Design of dimmable, color adjustable and flicker-free downlight circuit |
| CN110381639A (en) * | 2019-07-26 | 2019-10-25 | 帝奥微电子有限公司 | For eliminating the control circuit and method of LED ripple current |
| CN110381639B (en) * | 2019-07-26 | 2024-04-26 | 江苏帝奥微电子股份有限公司 | Control circuit and method for eliminating LED ripple current |
| CN112748756A (en) * | 2020-12-18 | 2021-05-04 | 珠海格力电器股份有限公司 | Power supply voltage ripple suppression method, device and control circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140730 Termination date: 20170303 |