CN201967214U - Constant current driving circuit for LED (light-emitting diode) lamp - Google Patents
Constant current driving circuit for LED (light-emitting diode) lamp Download PDFInfo
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- CN201967214U CN201967214U CN2011200439665U CN201120043966U CN201967214U CN 201967214 U CN201967214 U CN 201967214U CN 2011200439665 U CN2011200439665 U CN 2011200439665U CN 201120043966 U CN201120043966 U CN 201120043966U CN 201967214 U CN201967214 U CN 201967214U
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Abstract
The utility model discloses a constant current driving circuit for an LED (light-emitting diode) lamp, which comprises a PFC (Power Factor Correction) main circuit, a control signal circuit, a driving control circuit and a current loop regulating circuit. An output of the current loop regulating circuit is acted on the driving control circuit. An output of the driving control circuit is acted on the PFC main circuit so as to control the PFC main circuit to supply a constant current to the LED lamp. The current loop regulating circuit comprises an operational amplifier, an adjustable feedback impedance and an adjustable compensating network. A same-phase input end of the operational amplifier is used for inputting a reference voltage and an opposite-phase input end of the operational amplifier is connected with the adjustable feedback impedance. The adjustable compensating network is connected between the opposite-phase input end and an output end of the operational amplifier and is controlled by the control signal circuit to change the feedback impedance or an impedance of the compensating network. In the constant current driving circuit for the LED lamp, which is provided by the utility model, the current loop regulating circuit is controlled by the control signal circuit; loop parameters of the current loop regulating circuit are changed by changing the impedance value of the feedback impedance or the impedance of the compensating network; and the problem of flashing of the LED lamp under the condition of a light load, which is caused by large low-frequency ripple waves, is solved.
Description
Technical field
The utility model relates to LED lamp Drive Control Technique field, relates in particular to a kind of LED lamp constant-current drive circuit.
Background technology
The illumination of LED lamp is as a kind of lighting system of energy-saving and environmental protection, and the application in people's daily life also more and more widely.The LED lamp drives and adopts constant-current driving usually, it is one pole power factor correction circuit (the Power Factor Correction of topology that constant-current drive circuit mainly contains with the circuit of reversed excitation, PFC) form, being illustrated in figure 1 as with the circuit of reversed excitation is the constant-current drive circuit of topology.
In order to satisfy heavy duty higher power factor down, general design very low of the bandwidth of control loop, usually have only several hertz to tens hertz, and loop speed is very slow, therefore the low-frequency ripple of output is bigger, if be used for LED light modulation occasion, minimum usually load current need drop to rated current 10% in addition lower, and bigger low-frequency ripple can cause the output current instability, thereby causes the flicker of LED lamp.
The utility model content
In view of this, the utility model provides a kind of LED lamp constant-current drive circuit, during with solution prior art constant-current drive circuit underloading, and the problem that the LED lamp that causes greatly because of low-frequency ripple glimmers, technical scheme is as follows:
A kind of LED lamp constant-current drive circuit, comprise PFC main circuit, control signal circuit, Drive and Control Circuit and electric current loop regulating circuit, described electric current loop regulating circuit sampling LED lamp current or with the proportional signal of LED lamp current as its input signal, the output action of electric current loop regulating circuit is in Drive and Control Circuit, described Drive and Control Circuit acts on the PFC main circuit, and control PFC main circuit provides constant current for the LED lamp; Wherein, described electric current loop regulating circuit comprises: amplifier, adjustable compensation network and feedback impedance; The in-phase input end input reference voltage of described amplifier, inverting input connect described feedback impedance; Described adjustable compensation network is connected between the inverting input and output of described amplifier, and in the impedance of the control down conversion compensating network of described control signal.
A kind of LED lamp constant-current drive circuit, comprise PFC main circuit, control signal circuit, Drive and Control Circuit and electric current loop regulating circuit, described electric current loop regulating circuit sampling LED lamp current or with the proportional signal of LED lamp current as its input signal, the output action of electric current loop regulating circuit is in Drive and Control Circuit, described Drive and Control Circuit acts on the PFC main circuit, and control PFC main circuit provides constant current for the LED lamp; Wherein, described electric current loop regulating circuit comprises: amplifier, adjustable feedback impedance, compensating network; The in-phase input end input reference voltage of described amplifier, inverting input connect described adjustable feedback impedance; Described adjustable feedback impedance is in the control down conversion impedance of described control signal; Described compensating network is connected between the inverting input and output of described amplifier.
As can be seen from the above technical solutions, in the LED lamp constant-current drive circuit that the utility model provides, the control of electric current loop regulating circuit suspension control signal, by carrying out the impedance conversion of feedback impedance conversion or compensating network, come the loop parameter of conversion electric current loop regulating circuit, make the bandwidth of electric current loop regulating circuit can adapt to the conversion of load, thereby when having avoided prior art constant-current drive circuit underloading, the problem that the LED lamp that causes greatly because of low-frequency ripple glimmers can also guarantee that drive circuit heavy duty or full load have higher power factor simultaneously.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The principle schematic of the LED lamp constant-current drive circuit that Fig. 1 provides for prior art;
A kind of LED lamp constant-current drive circuit principle schematic that Fig. 2 provides for the utility model embodiment;
The electric current loop regulating circuit principle schematic 1 that Fig. 3 provides for the utility model embodiment;
The electric current loop regulating circuit principle schematic 2 that Fig. 4 provides for utility model embodiment;
The another kind of LED lamp constant-current drive circuit principle schematic that Fig. 5 provides for the utility model embodiment;
The principle schematic 3 of the electric current loop regulating circuit that Fig. 6 provides for the utility model embodiment;
The principle schematic 4 of the electric current loop regulating circuit that Fig. 7 provides for the utility model embodiment;
The another kind of LED lamp constant-current drive circuit principle schematic that Fig. 8 provides for the utility model embodiment;
The principle schematic of the control signal circuit that Fig. 9 provides for the utility model embodiment.
Embodiment
The utility model embodiment is during at prior art constant-current drive circuit underloading, and the problem of the LED lamp flicker that causes greatly because of low-frequency ripple provides a solution.
The utility model provides LED lamp constant-current drive circuit to comprise PFC main circuit, control signal circuit, Drive and Control Circuit and electric current loop regulating circuit, described electric current loop regulating circuit sampling LED lamp current or import as it with the proportional signal of LED lamp current, the output action of electric current loop regulating circuit is in Drive and Control Circuit, the output action of described Drive and Control Circuit is in the PFC main circuit, and control PFC main circuit provides constant current for the LED lamp.Wherein, the control of electric current loop regulating circuit suspension control signal circuit, by carrying out the impedance conversion of feedback impedance conversion or compensating network, come the loop parameter of conversion electric current loop regulating circuit, make the bandwidth of electric current loop regulating circuit can adapt to the conversion of load, thus the problem of LED lamp flicker when having solved underloading.
For those skilled in the art better being understood and implementing the utility model,, embodiment of the present utility model is further described in detail below with reference to Figure of description.
As shown in Figure 2, the LED lamp constant-current drive circuit that provides of the utility model embodiment can comprise:
PFC main circuit 100, control signal circuit 200, electric current loop regulating circuit 300 and Drive and Control Circuit 400; Described electric current loop regulating circuit 300 sampling LED lamp currents or import as it with the proportional signal of LED lamp current, the output action of electric current loop regulating circuit 300 is in Drive and Control Circuit 400, the output action of described Drive and Control Circuit 400 is in the PFC main circuit, and control PFC main circuit provides constant current for the LED lamp.Wherein, described electric current loop regulating circuit 300 comprises: amplifier A, feedback impedance S1, adjustable compensation network Z; The in-phase input end input reference voltage of described amplifier A, inverting input connect described adjustable feedback impedance S1; Described adjustable compensation network Z is connected between the inverting input and output of described amplifier A, and at the control down conversion feedback impedance of described control signal circuit 200.
Among the embodiment of the present utility model, referring to shown in Figure 3, feedback impedance S1 in the electric current loop regulating circuit in 300 is the 3rd resistance R, adjustable compensation network Z can comprise: first resistance R 1, the switch SW of connecting with described first resistance R 1, with series arm second resistance R 2 in parallel that the described switch SW and first resistance R 1 are formed, first capacitor C 1 of connecting with the parallel branch that described second resistance R 2 and described series arm are formed.
The utility model embodiment changes the loop parameter of electric current loop regulating circuit 300, i.e. transfer function by the compensating network Z in the conversion electric current loop regulating circuit 300.
When SW disconnects, transfer function:
Need to prove that s is a complex variable, for actual frequency, s=jw=j2 π f, then zero frequency
Pole frequency f
p=0, gain
When closed SW, R2 and R1 parallel connection (being designated as R2//R1), transfer function becomes:
Pole frequency still is f
p=0, zero frequency
Gain
As can be seen, when SW disconnected than the SW closure, zero frequency diminished but gains and becomes big.
In actual applications, can determine that zero frequency still is that gain is bigger to the influence of whole drive circuit bandwidth by the concrete parameter setting of capacitance resistance ware in the above-mentioned formula, and then decision is to disconnect SW or closed SW during underloading, in a word, underloading should increase bandwidth during heavy duty and improve response speed, solves underloading LED and influenced by low-frequency ripple and the flicker problem that produces.
Among another embodiment of the present utility model, referring to shown in Figure 4, feedback impedance S1 in the electric current loop regulating circuit 300 is the 3rd resistance R, adjustable compensation network Z can comprise: second capacitor C 2, the switch SW of connecting with described second capacitor C 2, with series arm first capacitor C 1 in parallel that the described switch SW and second capacitor C 2 are formed, second resistance R 2 of connecting with the parallel branch that described first capacitor C 1 and described series arm are formed.
When control signal circuit 200 control SW closures, C1 and C2 parallel connection, the transfer function of electric current loop regulating circuit 300
The zero frequency of electric current loop regulating circuit 300
Gain
200 control SW disconnect when the control signal circuit,
Zero frequency
Pole frequency f
p=0, gain
As can be seen, when SW disconnected than the SW closure, zero frequency became big and gain becomes greatly.So when underloading, should disconnect SW, make zero frequency become big, making gain become big, thereby increasing bandwidth, response speed is accelerated, and solves underloading LED and influenced by low-frequency ripple and the flicker problem that produces.
Referring to shown in Figure 5, the disclosed another kind of LED lamp constant-current drive circuit of the utility model embodiment can comprise:
PFC main circuit 100, control signal circuit 200, electric current loop regulating circuit 300 and Drive and Control Circuit 400, described electric current loop regulating circuit sampling LED lamp current or import as it with the proportional signal of LED lamp current, the output action of electric current loop regulating circuit is in Drive and Control Circuit, the output action of described Drive and Control Circuit is in the PFC main circuit, and control PFC main circuit provides constant current for the LED lamp.Wherein, described electric current loop regulating circuit 300 can comprise: amplifier A, adjustable feedback impedance S, compensating network Z1; The in-phase input end input reference voltage of described amplifier A, inverting input connect described adjustable feedback impedance S; Described adjustable feedback impedance S is in the control down conversion impedance magnitude of described control signal circuit 200; Described compensating network Z1 is connected between the inverting input and output of described amplifier A.
Among the embodiment of the present utility model, referring to shown in Figure 6, the compensating network Z1 in the electric current loop regulating circuit in 300 comprises: second resistance R 2, first capacitor C 1 of connecting with described second resistance R 2; Described adjustable feedback impedance S comprises: first resistance R 1, the switch SW of connecting with described first resistance is with series arm the 3rd resistance R in parallel of described switch SW and first resistance R, 1 composition.
In the present embodiment, when control signal circuit 200 control switch SW disconnect,
Zero frequency
Pole frequency f
p=0, gain
When control signal circuit 200 control switch SW are closed,
The zero frequency of electric current loop regulating circuit 300 still is
As can be seen, when SW disconnected than the SW closure, zero frequency was constant, and gain diminishes.So answer Closing Switch SW to make gain become big when underloading, thereby the bandwidth of whole drive circuit improves, the response speed of circuit is accelerated, thus the problem of LED lamp flicker when having avoided underloading.
Among another embodiment of the present utility model, referring to shown in Figure 7, the compensating network Z1 in the electric current loop regulating circuit in 300 comprises: second resistance R 2, first capacitor C 1 of connecting with described second resistance R 2; Described adjustable feedback impedance S comprises: first resistance R 1, the switch SW and second capacitor C 2 of connecting with described first resistance R 1 are with series arm the 3rd resistance R in parallel of described switch SW, first resistance R 1 and second capacitor C, 2 compositions.
In the present embodiment, when control signal circuit 200 control switch SW disconnect,
Zero frequency
Pole frequency f
p=0, gain
When control signal circuit 200 control switch SW are closed, the transfer function of electric current loop regulating circuit 300
The zero frequency of electric current loop regulating circuit 300 is respectively
With
Pole frequency is respectively
And f
p=0, gain
As seen, the switch SW closure has increased a zero point and limit when disconnecting than SW more and gain becomes big, so, should Closing Switch SW during underloading, improve response speed thereby increase the electric current loop bandwidth.
Need to prove that the underloading described in the literary composition is meant the certain percentage of load current smaller or equal to full-load current, for example 30%, 20%, 10%, 5%, can set according to concrete needs.
In addition, those skilled in the art are to be understood that, in the middle of the practical application, adopt different topology to have a variety of as the form of the LED lamp constant-current drive circuit of PFC main circuit, can be isolated form circuit or non-isolation type circuit as the PFC main circuit, described isolated form PFC main circuit can be the Flyback circuit, and described non-isolation type PFC main circuit can be the boost circuit.This paper can not all circuit forms of limit, more than the LED lamp constant-current drive circuit introduced only be used to illustrate utility model design of the present utility model, do not represent the utility model can only be applied in the circuit disclosed above.In the LED lamp constant-current drive circuit, the quantity of electric current loop regulating circuit and position need be decided according to the application scenarios of reality.For example in LED lamp constant-current drive circuit, can have a plurality of electric current loop regulating circuits that are positioned at diverse location, below a simple example be illustrated.
Referring to shown in Figure 8, when the PFC main circuit in the LED lamp constant-current drive circuit is circuit of reversed excitation Flyback, comprise two electric current loop regulating circuits in the circuit, Drive and Control Circuit comprises former limit control chip and buffer circuit, wherein the secondary of first electric current loop regulating circuit and main transformer T altogether, second electric current loop regulating circuit and the former limit of main transformer T normally are positioned at the electric current loop regulating circuit of PFC control chip inside, former limit altogether.(its limit, Central Plains control chip transfer function gain is designated as A to the transfer function C=KAB of the master control loop that former limit control chip internal current ring regulating circuit and secondary current ring regulating circuit are cascaded into k-factor, the gain of secondary current ring transfer function is designated as B), by log (KAB)=log (KA)+log (B) as can be known, the gain decibels of C is an A and B gain decibels sum, and the parameter that therefore no matter changes former limit and still be the secondary current ring can both influence the master control loop bandwidth and then influence its response speed.
Buffer circuit can be embodied as optocoupler in actual applications, and the control circuit that makes the former limit of main transformer and secondary is not altogether.
Need to prove, no matter be the electric current loop regulating circuit on former limit or the electric current loop regulating circuit of secondary can adopt Fig. 4, Fig. 5, Fig. 6, Fig. 7 shown in mode change loop parameter.
Need to prove, as shown in Figure 9, more than the control signal circuit mentioned among each embodiment can comprise: comparator U1 and the 4th resistance R 4; Wherein, the input of described comparator U1 connects described the 4th resistance R 4, and this input is with the signal of LED lamp current as input; The underloading reference current Iref of another input input user preset of described amplifier U1, the output of described comparator U1 is control signal.When lamp current was lower than described underloading reference current Iref, the control signal circuit was controlled the impedance of described compensating network or the conversion of feedback impedance.
Need to prove, when described LED lamp constant-current drive circuit has dimming function, the input of described control signal circuit can directly be corresponding dim signal, when having 0 to 10V dimming function such as described LED lamp constant-current drive circuit, described control signal circuit be input as 0 to the 10V dim signal, the impedance of the described compensating network of its output control or the conversion of feedback impedance.
In addition, need to prove, more than the switch SW mentioned among each embodiment, in the practical application, can select metal-oxide-semiconductor, insulated gate bipolar transistor, triode, controllable silicon or relay or the like.
Drive and Control Circuit described in the literary composition is output as pulse signal, the duty ratio size of pulse signal is by the input decision of Drive and Control Circuit, the output of described Drive and Control Circuit connects the control end of the switching device in the PFC main circuit, the size of control LED load current.
Need to prove, in this article, relational terms such as first and second grades only is used for an entity or operation are made a distinction with another entity or operation, and not necessarily requires or hint and have the relation of any this reality or in proper order between these entities or the operation.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby make and comprise that process, method, article or the equipment of a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or also be included as this process, method, article or equipment intrinsic key element.Do not having under the situation of more restrictions, the key element that limits by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
The above only is an embodiment of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (10)
1. LED lamp constant-current drive circuit, comprise PFC main circuit, control signal circuit, Drive and Control Circuit and electric current loop regulating circuit, described electric current loop regulating circuit sampling LED lamp current or with the proportional signal of LED lamp current as its input signal, the output action of electric current loop regulating circuit is in Drive and Control Circuit, described Drive and Control Circuit acts on the PFC main circuit, and control PFC main circuit provides constant current for the LED lamp; It is characterized in that described electric current loop regulating circuit comprises: amplifier, adjustable compensation network and feedback impedance; The in-phase input end input reference voltage of described amplifier, inverting input connects described feedback impedance; Described adjustable compensation network is connected between the inverting input and output of described amplifier, and in the impedance of the control down conversion compensating network of described control signal circuit.
2. LED lamp constant-current drive circuit according to claim 1 is characterized in that described feedback impedance is the 3rd resistance.
3. LED lamp constant-current drive circuit according to claim 2, it is characterized in that, described adjustable compensation network comprises: first resistance, the switch of connecting with described first resistance, with series arm second resistance in parallel that the described switch and first resistance are formed, first electric capacity of connecting with the parallel branch that described second resistance and described series arm are formed.
4. LED lamp constant-current drive circuit according to claim 2, it is characterized in that, described adjustable compensation network comprises: second electric capacity, switch with described second capacitances in series, with series arm first electric capacity in parallel that the described switch and second electric capacity are formed, second resistance of connecting with the parallel branch that described first electric capacity and described series arm are formed.
5. according to any described LED lamp constant-current drive circuit of claim 1-4, it is characterized in that described switch is metal-oxide-semiconductor, insulated gate bipolar transistor, triode, controllable silicon or relay.
6. LED lamp constant-current drive circuit, comprise PFC main circuit, control signal circuit, Drive and Control Circuit and electric current loop regulating circuit, described electric current loop regulating circuit sampling LED lamp current or with the proportional signal of LED lamp current as its input signal, the output action of electric current loop regulating circuit is in Drive and Control Circuit, described Drive and Control Circuit acts on the PFC main circuit, and control PFC main circuit provides constant current for the LED lamp; It is characterized in that described electric current loop regulating circuit comprises: amplifier, adjustable feedback impedance, compensating network; The in-phase input end input reference voltage of described amplifier, inverting input connect described adjustable feedback impedance; Described adjustable feedback impedance is in the control down conversion impedance of described control signal circuit; Described compensating network is connected between the inverting input and output of described amplifier.
7. LED lamp constant-current drive circuit according to claim 6 is characterized in that described compensating network comprises: second resistance, first electric capacity of connecting with described second resistance.
8. LED lamp constant-current drive circuit according to claim 7 is characterized in that, described adjustable feedback impedance comprises: first resistance, the switch of connecting with described first resistance is with series arm the 3rd resistance in parallel of described switch and first resistance composition.
9. LED lamp constant-current drive circuit according to claim 7, it is characterized in that, described adjustable feedback impedance comprises: first resistance, the switch and second electric capacity of connecting with described first resistance are with series arm the 3rd resistance in parallel of described switch, first resistance and second electric capacity composition.
10. according to any described LED lamp constant-current drive circuit of claim 6-9, it is characterized in that described switch is metal-oxide-semiconductor, insulated gate bipolar transistor, triode, controllable silicon or relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200439665U CN201967214U (en) | 2011-02-22 | 2011-02-22 | Constant current driving circuit for LED (light-emitting diode) lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200439665U CN201967214U (en) | 2011-02-22 | 2011-02-22 | Constant current driving circuit for LED (light-emitting diode) lamp |
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| CN201967214U true CN201967214U (en) | 2011-09-07 |
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| CN2011200439665U Expired - Fee Related CN201967214U (en) | 2011-02-22 | 2011-02-22 | Constant current driving circuit for LED (light-emitting diode) lamp |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102647823A (en) * | 2011-02-22 | 2012-08-22 | 英飞特电子（杭州）有限公司 | Constant current driving circuit for LED (Light Emitting Diode) lamp |
| CN103812323A (en) * | 2012-11-08 | 2014-05-21 | 常州隆辉照明科技有限公司 | Power factor compensating circuit |
| CN103813596A (en) * | 2014-03-10 | 2014-05-21 | 杭州士兰微电子股份有限公司 | LED (Light-Emitting Diode) driving circuit and method for reducing LED current ripple |
| CN103904879A (en) * | 2014-01-09 | 2014-07-02 | 常州隆辉照明科技有限公司 | Compensating circuit and method for buck circuit power factor |
| CN111867176A (en) * | 2019-04-08 | 2020-10-30 | 华润矽威科技（上海）有限公司 | LED drive circuit and silicon controlled rectifier dimming circuit |
-
2011
- 2011-02-22 CN CN2011200439665U patent/CN201967214U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102647823A (en) * | 2011-02-22 | 2012-08-22 | 英飞特电子（杭州）有限公司 | Constant current driving circuit for LED (Light Emitting Diode) lamp |
| CN102647823B (en) * | 2011-02-22 | 2014-11-26 | 英飞特电子（杭州）股份有限公司 | Constant current driving circuit for LED (Light Emitting Diode) lamp |
| CN103812323A (en) * | 2012-11-08 | 2014-05-21 | 常州隆辉照明科技有限公司 | Power factor compensating circuit |
| CN103904879A (en) * | 2014-01-09 | 2014-07-02 | 常州隆辉照明科技有限公司 | Compensating circuit and method for buck circuit power factor |
| CN103813596A (en) * | 2014-03-10 | 2014-05-21 | 杭州士兰微电子股份有限公司 | LED (Light-Emitting Diode) driving circuit and method for reducing LED current ripple |
| CN111867176A (en) * | 2019-04-08 | 2020-10-30 | 华润矽威科技（上海）有限公司 | LED drive circuit and silicon controlled rectifier dimming circuit |
| CN111867176B (en) * | 2019-04-08 | 2023-01-03 | 华润微集成电路(无锡)有限公司 | LED drive circuit and silicon controlled rectifier dimming circuit |
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Address after: Hangzhou City, Zhejiang province 310053 Binjiang District Dongxin Road No. 66 East communication B block 309 Patentee after: LED One (Hangzhou) Co.,Ltd. Address before: Hangzhou City, Zhejiang province 310053 Binjiang District Dongxin Road No. 66 East communication B block 309 Patentee before: Inventronics (Hangzhou) Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110907 Termination date: 20150222 |
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