CN102647823B - 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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Abstract
The invention 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 regulation circuit, wherein the output of the current loop regulation circuit acts on the driving control circuit, the output of the driving control circuit acts on the PFC main circuit and controls the same to provide constant current for the LED lamp; the current loop regulation circuit comprises an operational amplifier, an adjustable feedback impedance and an adjustable compensating network; the non-inverting input terminal of the operational amplifier inputs a reference voltage, and the inverting input terminal of the operational amplifier is connected with the adjustable feedback impedance; and the adjustable compensating network is connected between the non-inverting input terminal and the output terminal of the operational amplifier, and converts the feedback impedance or the impedance of the compensating network under the control of the control signal circuit. In the constant current driving circuit for the LED lamp, disclosed by the invention, the current loop regulation circuit is controlled by the control signal circuit, and the loop parameters of the current loop regulation circuit are converted by conducting the feedback impedance conversion or the impedance valve conversion of the compensating network, so the flickering problem of the LED lamp caused by larger low-frequency ripples during the light load of the circuit is solved.
Description
Technical field
The present invention relates to LED lamp Drive Control Technique field, relate 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 is also more and more extensive.LED lamp drives and conventionally adopts constant current to drive, constant-current drive circuit mainly contains taking circuit of reversed excitation as topological one pole power factor correction circuit (Power Factor Correction, PFC) composition, is illustrated in figure 1 taking circuit of reversed excitation as topological constant-current drive circuit.
In order to meet power factor higher under heavy duty, general design very low of bandwidth of control loop, conventionally only have several hertz to tens hertz, and loop speed is very slow, therefore the low-frequency ripple of output is larger, if for LED light modulation occasion, conventionally minimum load current need to drop to the 10% even lower of rated current, and larger low-frequency ripple can cause output current unstable, thereby cause the flicker of LED lamp.
Summary of the invention
In view of this, the invention provides a kind of LED lamp constant-current drive circuit, when solving prior art constant-current drive circuit underloading, because low-frequency ripple is compared with the problem of the LED lamp flicker causing greatly, 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 signal proportional to LED lamp current are 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 PFC main circuit, controls PFC main circuit and provides constant current to 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 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.
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 signal proportional to LED lamp current are 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 PFC main circuit, controls PFC main circuit and provides constant current to 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 connects 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 LED lamp constant-current drive circuit provided by the invention, the control of electric current loop regulating circuit suspension control signal, by carrying out the impedance transformation of feedback impedance conversion or compensating network, convert the loop parameter of electric current loop regulating circuit, make the bandwidth of electric current loop regulating circuit can adapt to the conversion of load, thereby while having avoided prior art constant-current drive circuit underloading, because low-frequency ripple is compared with the problem of the LED lamp flicker causing greatly, can also ensure that drive circuit heavy duty or full load have higher power factor simultaneously.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
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 embodiment of the present invention;
The electric current loop regulating circuit principle schematic 1 that Fig. 3 provides for the embodiment of the present invention;
The electric current loop regulating circuit principle schematic 2 that Fig. 4 provides for inventive embodiments;
The another kind of LED lamp constant-current drive circuit principle schematic that Fig. 5 provides for the embodiment of the present invention;
The principle schematic 3 of the electric current loop regulating circuit that Fig. 6 provides for the embodiment of the present invention;
The principle schematic 4 of the electric current loop regulating circuit that Fig. 7 provides for the embodiment of the present invention;
The another kind of LED lamp constant-current drive circuit principle schematic that Fig. 8 provides for the embodiment of the present invention;
The principle schematic of the control signal circuit that Fig. 9 provides for the embodiment of the present invention.
Embodiment
The embodiment of the present invention during for prior art constant-current drive circuit underloading, because low-frequency ripple is compared with the problem of the LED lamp flicker causing greatly, provides a solution.
The invention provides LED lamp constant-current drive circuit and 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 signal proportional to LED lamp current are inputted as it, the output action of electric current loop regulating circuit is in Drive and Control Circuit, the output action of described Drive and Control Circuit, in PFC main circuit, is controlled PFC main circuit and is provided constant current to LED lamp.Wherein, the control of electric current loop regulating circuit suspension control signal circuit, by carrying out the impedance transformation of feedback impedance conversion or compensating network, convert the loop parameter of 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 while having solved underloading.
In order to make those skilled in the art better understand and implement the present invention, below with reference to Figure of description, the specific embodiment of the present invention is described in further detail.
As shown in Figure 2, the LED lamp constant-current drive circuit that the embodiment of the present invention provides can comprise:
PFC main circuit 100, control signal circuit 200, electric current loop regulating circuit 300 and Drive and Control Circuit 400; Sample LED lamp current or signal proportional to LED lamp current of described electric current loop regulating circuit 300 inputted as it, 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, in PFC main circuit, is controlled PFC main circuit and is provided constant current to 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 connects 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.
In one embodiment of the present of invention, shown in Figure 3, feedback impedance S1 in electric current loop regulating circuit in 300 is the 3rd resistance R, adjustable compensation network Z can comprise: the first resistance R 1, the switch SW of connecting with described the first resistance R 1, series arm the second resistance R 2 in parallel forming with described switch SW and the first resistance R 1, first capacitor C 1 of connecting with the parallel branch of described the second resistance R 2 and described series arm composition.
The embodiment of the present invention, by the compensating network Z in conversion electric current loop regulating circuit 300, changes the loop parameter of electric current loop regulating circuit 300, i.e. transfer function.
In the time that SW disconnects, transfer function:
It should be noted that s is complex variable, for actual frequency, s=jw=j2 π f, zero frequency
pole frequency f
p=0, gain
In the time of closed SW, R2 and R1 parallel connection (being designated as R2//R1), transfer function becomes:
pole frequency is still f
p=0, zero frequency
gain
Can find out, when SW disconnects compared with SW closure, zero frequency diminishes but gains and becomes large.
In actual applications, can arrange to determine to be that zero frequency or gain are larger on the impact of whole drive circuit bandwidth by the design parameter of capacitance resistance ware in above-mentioned formula, and then determine when underloading it is to disconnect SW or closed SW, in a word, when underloading is more heavily loaded, should increase bandwidth and improve response speed, solve underloading LED and affected by low-frequency ripple and the flicker problem that produces.
In an alternative embodiment of the invention, shown in Figure 4, feedback impedance S1 in electric current loop regulating circuit 300 is the 3rd resistance R, adjustable compensation network Z can comprise: the second capacitor C 2, the switch SW of connecting with described the second capacitor C 2, series arm the first capacitor C 1 in parallel forming with described switch SW and the second capacitor C 2, second resistance R 2 of connecting with the parallel branch of described the first capacitor C 1 and described series arm composition.
When control signal circuit 200 is controlled SW closure, 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
control SW when control signal circuit 200 and disconnect,
zero frequency
pole frequency f
p=0, gain
Can find out, when SW disconnects compared with SW closure, zero frequency becomes large and gains and becomes greatly.So should disconnect SW in the time of underloading, make zero frequency become large, make gain become large, thereby increase bandwidth, response speed is accelerated, and solves underloading LED and affected by low-frequency ripple and the flicker problem that produces.
Shown in Figure 5, the disclosed another kind of LED lamp constant-current drive circuit of the embodiment of the present invention, 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 signal proportional to LED lamp current are inputted as it, the output action of electric current loop regulating circuit is in Drive and Control Circuit, the output action of described Drive and Control Circuit, in PFC main circuit, is controlled PFC main circuit and is provided constant current to 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 connects 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.
In one embodiment of the present of invention, shown in Figure 6, the compensating network Z1 in electric current loop regulating circuit in 300 comprises: the second resistance R 2, first capacitor C 1 of connecting with described the second resistance R 2; Described adjustable feedback impedance S comprises: the first resistance R 1, the switch SW of connecting with described the first resistance, series arm the 3rd resistance R in parallel forming with described switch SW and the first resistance R 1.
In the present embodiment, in the time that control signal circuit 200 control switch SW disconnect,
zero frequency
pole frequency f
p=0, gain
in the time that control signal circuit 200 control switch SW are closed,
the zero frequency of electric current loop regulating circuit 300 is still
Can find out, when SW disconnects compared with SW closure, zero frequency is constant, and gain diminishes.So answer Closing Switch SW to make gain become large in the time of underloading, thereby the bandwidth of whole drive circuit improves, the response speed of circuit is accelerated, thereby problem of LED lamp flicker while having avoided underloading.
In an alternative embodiment of the invention, shown in Figure 7, the compensating network Z1 in electric current loop regulating circuit in 300 comprises: the second resistance R 2, first capacitor C 1 of connecting with described the second resistance R 2; Described adjustable feedback impedance S comprises: the first resistance R 1, switch SW and second capacitor C 2 of connecting with described the first resistance R 1, series arm the 3rd resistance R in parallel forming with described switch SW, the first resistance R 1 and the second capacitor C 2.
In the present embodiment, in the time that control signal circuit 200 control switch SW disconnect,
zero frequency
pole frequency f
p=0, gain
in the time that 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
Visible, switch SW closure while disconnection compared with SW, has increased a zeros and poles more and gain becomes large, so, should Closing Switch SW when underloading, improve response speed thereby increase electric current loop bandwidth.
It should be noted that, the underloading described in literary composition refers to that load current is less than or equal to the certain percentage of 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 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, if PFC main circuit can be isolated form circuit or non-isolation type circuit, described isolated form PFC main circuit can be Flyback circuit, and described non-isolation type PFC main circuit can be boost circuit.The impossible all circuit forms of limit herein, above introduced LED lamp constant-current drive circuit, only for inventive concept of the present invention is described, does not represent that the present invention can only be applied in circuit disclosed above.In LED lamp constant-current drive circuit, the quantity of electric current loop regulating circuit and position, need to determine according to actual application scenarios.For example, in a LED lamp constant-current drive circuit, can have multiple electric current loop regulating circuits that are positioned at diverse location, below a simple example be illustrated.
Shown in Figure 8, in the time that the PFC main circuit in LED lamp constant-current drive circuit is circuit of reversed excitation Flyback, circuit comprises two electric current loop regulating circuits, 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 altogether, are normally positioned at the electric current loop regulating circuit of PFC control chip inside, former limit.(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), from log (KAB)=log (KA)+log (B), the gain decibels of C is A and B gain decibels sum, and therefore no matter changing former limit or the parameter of secondary current ring can affect master control loop bandwidth and then affect its response speed.
Buffer circuit can be embodied as optocoupler in actual applications, makes the former limit of main transformer and the control circuit of secondary not altogether.
It should be noted that, be no matter 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.
It should be noted that, as shown in Figure 9, the control signal circuit of mentioning in above each embodiment can comprise: comparator U1 and the 4th resistance R 4; Wherein, an input of described comparator U1 connects described the 4th resistance R 4, the signal of this input using 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 is during lower than described underloading reference current Iref, the impedance of compensating network or the conversion of feedback impedance described in the control of control signal circuit.
It should be noted that, when described LED lamp constant-current drive circuit is during with dimming function, the input of described control signal circuit can be directly corresponding dim signal, while arriving the dimming function of 10V such as described LED lamp constant-current drive circuit with 0, described control signal circuit be input as 0 to 10V dim signal, the impedance of described compensating network or conversion of feedback impedance are controlled in its output.
In addition, it should be noted that the switch SW of mentioning in above each embodiment, in practical application, can be selected metal-oxide-semiconductor, insulated gate bipolar transistor, triode, controllable silicon or relay set.
Drive and Control Circuit described in literary composition is output as pulse signal, the duty ratio size of pulse signal is determined by the input of Drive and Control Circuit, the output of described Drive and Control Circuit connects the control end of the switching device in PFC main circuit, controls the size of LED load current.
It should be noted that, in this article, relational terms such as the first and second grades is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply and between these entities or operation, have the relation of any this reality or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby the process, method, article or the equipment that make to comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or be also included as the intrinsic key element of this process, method, article or equipment.The in the situation that of more restrictions not, the key element being limited 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 is only the specific embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a 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 signal proportional to LED lamp current are 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 PFC main circuit, controls PFC main circuit and provides constant current to 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 during lower than default underloading reference current (Iref), is subject to the impedance of the control down conversion compensating network of described control signal circuit at lamp current.
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: the first resistance, the switch of connecting with described the first resistance, second resistance in parallel with the series arm of described switch and the first resistance composition, first electric capacity of connecting with the parallel branch of described the second resistance and described series arm composition.
4. LED lamp constant-current drive circuit according to claim 2, it is characterized in that, described adjustable compensation network comprises: the second electric capacity, switch with described the second capacitances in series, first electric capacity in parallel with the series arm of described switch and the second electric capacity composition, second resistance of connecting with the parallel branch of described the first electric capacity and described series arm composition.
5. according to the LED lamp constant-current drive circuit described in claim 1-4 any one, it is characterized in that, described switch is metal-oxide-semiconductor, insulated gate bipolar transistor, triode, controllable silicon or relay.
6. a 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 signal proportional to LED lamp current are 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 PFC main circuit, controls PFC main circuit and provides constant current to 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 connects described adjustable feedback impedance; Described adjustable feedback impedance during lower than default underloading reference current (Iref), is subject to the control down conversion impedance of described control signal circuit at lamp current; 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: the second resistance, first electric capacity of connecting with described the second resistance.
8. LED lamp constant-current drive circuit according to claim 7, is characterized in that, described adjustable feedback impedance comprises: the first resistance, the switch of connecting with described the first resistance, three resistance in parallel with the series arm of described switch and the first resistance composition.
9. LED lamp constant-current drive circuit according to claim 7, it is characterized in that, described adjustable feedback impedance comprises: the first resistance, switch and second electric capacity of connecting with described the first resistance, three resistance in parallel with the series arm of described switch, the first resistance and the second electric capacity composition.
10. according to the LED lamp constant-current drive circuit described in claim 6-9 any one, it is characterized in that, described switch is metal-oxide-semiconductor, insulated gate bipolar transistor, triode, controllable silicon or relay.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110042397.7A CN102647823B (en) | 2011-02-22 | 2011-02-22 | Constant current driving circuit for LED (Light Emitting Diode) lamp |
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| CN201110042397.7A CN102647823B (en) | 2011-02-22 | 2011-02-22 | Constant current driving circuit for LED (Light Emitting Diode) lamp |
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| CN102647823B true CN102647823B (en) | 2014-11-26 |
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| CN103716970B (en) * | 2014-01-23 | 2015-09-30 | 英飞特电子（杭州）股份有限公司 | A kind of LED drive circuit |
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| CN108459650B (en) * | 2017-02-22 | 2023-09-12 | 普源精电科技股份有限公司 | Constant voltage control loop and electronic load |
| CN109219189B (en) * | 2018-08-24 | 2024-09-03 | 南京博德新能源技术有限公司 | Circuit with fast current protection and slow current regulation functions for driving LED lamp |
| CN109041353B (en) * | 2018-09-13 | 2023-09-19 | 深圳茂硕电子科技有限公司 | Variable-gain current loop feedback compensation control circuit |
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