CN201571240U - Multichannel constant-current control module - Google Patents
Multichannel constant-current control module Download PDFInfo
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- CN201571240U CN201571240U CN2009202960151U CN200920296015U CN201571240U CN 201571240 U CN201571240 U CN 201571240U CN 2009202960151 U CN2009202960151 U CN 2009202960151U CN 200920296015 U CN200920296015 U CN 200920296015U CN 201571240 U CN201571240 U CN 201571240U
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Abstract
A multichannel constant-current control module includes a plurality of load connection terminals, a multipath constant current circuit, a multipath feedback voltage comparison circuit, and an optical-coupling isolating circuit, a constant current circuit is arranged between the ground and each of the plurality of load connection terminals, each voltage signal crosses each feedback voltage comparison circuit to output a comparison signal, the comparison signal from the multipath feedback voltage comparison circuit is transmitted to an input end of the optical coupling isolating circuit, and an output end of the optical coupling isolating circuit outputs a feedback signal. The control module also may include a sampling voltage drive circuit. The control module also includes a connection power supply terminal and is added with a feedback voltage comparison circuit, and voltage signal connected with a power supply terminal crosses the feedback voltage comparison circuit to output a comparison signal to the input end of the optical coupling isolating circuit. The utility model is syncretized with PWM constant voltage technology and DC constant current technology such that cost is low, and is capable of implementing multipath independent constant current with high efficiency and completely satisfying constant current requirement to multiple groups of LEDs of middle/small power lighting lamps.
Description
Technical field:
The utility model relates to a kind of multichannel constant current control module, is applied to multichannel loading constant current control, is mainly used in many group LED constant current controls.
Background technology:
Because the brightness of LED is controlled by constant current, and the main series connection by many groups LED of middle high-power LED illumination realizes, because the difference of LED junction voltage, many groups structure in parallel can't guarantee the constant current of LED, the possibility that has chain reaction simultaneously, i.e. one group of damage causes a chain of the damage.Multiple constant current is an optimal scheme, and voltage source+the multi-channel PWM constant-current source is good scheme to adopt AC/DC, but cost is too high, and the following constant-current source of 120W adopts this scheme price to be difficult to bear.
Summary of the invention:
The purpose of this utility model is exactly at the too high problem of present domestic illumination LED constant-current source cost, proposes the high multichannel constant current control module of a kind of cost performance.
For achieving the above object, the utility model multichannel constant current control module, comprise a plurality of connection face terminals, multiple constant current circuit, multichannel feedback voltage comparison circuit, optical coupling isolation circuit, a plurality of connection face terminals, its each with ground between be connected No. one constant-current circuit, its each voltage signal is through one road feedback voltage comparison circuit output comparison signal, the comparison signal of described multichannel feedback voltage comparison circuit output is all transported to the input of optical coupling isolation circuit, the output output feedback signal of optical coupling isolation circuit.
Also the sampled voltage drive circuit can be set between the input of above-mentioned each connection face terminals and feedback voltage comparison circuit.
Can comprise that also connects a power supply terminal, above-mentioned multichannel feedback voltage comparison circuit increases by one the tunnel again, and the voltage signal that connects power supply terminal is through the input of this feedback voltage comparison circuit output comparison signal to optical coupling isolation circuit.
In one embodiment, above-mentioned constant-current circuit comprises the sampling resistor that is connected between connection face terminals and the ground.
In a kind of preferred implementation, above-mentioned constant-current circuit comprises electric current and adjusts element, sampling resistor, voltage comparator circuit, electric current is connected between connection face terminals and the ground after adjusting element and sampling resistor series connection, electric current is adjusted the input of the voltage signal input voltage comparison circuit of element and sampling resistor tie point, and the output output comparison signal of voltage comparator circuit is adjusted the control end of element to electric current.Electric current is adjusted element and be can be field effect transistor, and then the control end of this electric current adjustment element is the grid of field effect transistor, and electric current is adjusted element and also be can be triode, and then the control end of this electric current adjustment element is the base stage of triode.
The utility model adopts independently constant-current circuit realization multiple constant current of multichannel, avoid one group of damage, cause a chain of the damage, by each being connected the voltage signal sampling feedback of face terminals, realize the closed-loop control of electric power output voltage, make it to reach the minimum voltage of best constant current conditions, reduce power consumption.By to connecting the voltage signal sampling feedback of power supply terminal, realize the closed-loop control of electric power output voltage, the output voltage of avoiding opening a way is too high.In a kind of preferred implementation, adopt independently closed-loop control field effect transistor of multichannel or triode to realize the constant current of multichannel independence, by sampling feedback to field effect transistor or triode voltage across poles, realize the adjustment of electric power output voltage, make it to reach minimum voltage and the field effect transistor or the triode lowest power consumption of best constant current conditions, thereby reach the highest efficient.
The utility model has merged PWM manostatic technique and direct current constant current technology, and is with low cost, realized the constant current of multichannel independence simultaneously, and the efficient height satisfies the constant current requirement that the middle low power lighting is organized LED more fully.
AC/DC voltage source+multi-channel PWM constant-current source the scheme and the AC/DC single channel constant-current source scheme that are different from absolute construction.Voltage source+multi-channel PWM current source scheme cost height, AC/DC single channel constant-current source can't satisfy the current-sharing of LED between group, also has chain reaction hidden danger.The utility model has solved cost problem and equal flow problem, efficient height simultaneously well.
Description of drawings:
Fig. 1 is for using circuit working principle schematic of the present utility model;
Fig. 2 is the operation principle block diagram of the utility model embodiment one;
Fig. 3 is the circuit theory diagrams of Fig. 2 constant-current circuit An and sampled voltage drive circuit Bn;
Fig. 4 is Fig. 2 feedback voltage comparison circuit E1, E2 ... the circuit theory diagrams of En, F and optical coupling isolation circuit G;
Fig. 5 is the circuit theory diagrams of the utility model embodiment two.
Embodiment:
As shown in Figure 1, many group LED are the output loading of Switching Power Supply, a plurality of connection face terminals H1, the H2 of the utility model M4CM ... Hn is negative pole LED1-, the LED2-of serial connection group LED respectively ... LEDn-, one connects the feeder ear LED+ that power supply terminal OVP connects many group LED, for the purpose of directly perceived, a plurality of connection face terminals that embodiment describes are LED1-to LEDn-, and one connects power supply terminal is LED+, and the utility model M4CM output feedback signal FB is to the PWM MCU control chip of Switching Power Supply.
Below in conjunction with accompanying drawing the utility model embodiment is described in detail.
Embodiment one:
As shown in Figure 2, the utility model embodiment one comprises a plurality of connection face terminals LED1-to LEDn-, one connects power supply terminal LED+, multiple constant current circuit A1 to An, multi-channel sampling Voltag driving circuit B1 to Bn and feedback voltage comparison circuit E1 to En and F, optical coupling isolation circuit G, a plurality of connection face terminals LED1-to LEDn-, its each with ground between be connected No. one constant-current circuit, its each voltage signal is successively through one road sampled voltage drive circuit, feedback voltage comparison circuit output comparison signal, a voltage signal that connects power supply terminal LED+ is through feedback voltage comparison circuit F output comparison signal, multi-channel sampling connects the feedback voltage comparison circuit E1 to En of face terminals, the comparison signal of the feedback voltage comparison circuit F output of one tunnel sampling connection power supply terminal is all transported to the input of optical coupling isolation circuit G, the output output feedback signal FB of optical coupling isolation circuit G.
As shown in Figure 3, be the circuit theory diagrams of Fig. 2 No. one constant-current circuit An and one road sampled voltage drive circuit Bn; Constant-current circuit An comprises electric current and adjusts element field effect transistor Q2, sampling resistor Rsense, voltage comparator circuit, voltage comparator circuit comprises operational amplifier U6A, be connected after field effect transistor Q2 and the sampling resistor Rsense series connection and connect between face terminals LEDn-and the ground, the voltage signal of field effect transistor Q2 and sampling resistor Rsense tie point is through the input of resistance R 6 input operational amplifier U6A, another input of operational amplifier U6A connects reference voltage V e, and the output output comparison signal of operational amplifier U6A is to the grid of field effect transistor Q2.Constant-current circuit An realizes circuit turn-on, and forms closed-loop control by Voltage Feedback and the reference voltage V e of sampling resistor Rsense for adopting operational amplifier output control field effect transistor Q2, realizes the constant of electric current.Sampled voltage drive circuit Bn is an operational amplifier U6B amplifying circuit, is in-phase amplification circuit, realizes that the sampling of the voltage signal Vd of connection face terminals LEDn-drives amplification.
As shown in Figure 4, connect the feedback voltage comparison circuit E1 to En of face terminals, the feedback voltage comparison circuit F of one tunnel sampling connection power supply terminal and the circuit theory diagrams of light-coupled isolation G for Fig. 2 multi-channel sampling; The feedback voltage comparison circuit comprises voltage adjustment TL431, and voltage is adjusted the corresponding voltage signal of input input of TL431.Fig. 4 is that multichannel connects face terminals is connected power supply terminal with one tunnel voltage sample feedback, by light-coupled isolation U2 control PWM MCU control chip.
Vcc is an operating voltage, has adopted among Fig. 3 and Fig. 4+12V, if adopt other voltages, corresponding resistance R 21/R31/R22/R32 ... Deng the needs adjustment of being correlated with.
Amplify by the signal of adjusting sampled voltage, realize the adjustment of electric power output voltage, make it to reach the minimum voltage and the field effect transistor lowest power consumption of best constant current conditions, thereby reach the highest efficient.The field effect transistor internal resistance difference of different model, tube voltage drop is deviation slightly, therefore adopts the field effect transistor of different model, and sample circuit also needs suitable adjustment.
It is field effect transistor Q2 that above-mentioned electric current is adjusted element, also can adopt triode.Above-mentioned sampled voltage drive circuit Bn is the operational amplifier amplifying circuit, also can adopt transistor amplifier.Above-mentioned feedback voltage comparison circuit adopts voltage to adjust TL431, voltage is adjusted the corresponding voltage signal of input input of TL431, also can adopt operational amplifier, a corresponding voltage signal of input input of operational amplifier, another input connects reference voltage, or the like.Operation principle is identical, does not enumerate one by one.
Embodiment two:
As shown in Figure 5, be the circuit theory diagrams of the utility model embodiment two.Different with embodiment one is, with sampling resistor Rs1, Rs2 ... Rsn has replaced constant-current circuit A1, the A2 of embodiment one ... An has saved sampled voltage drive circuit B1, B2 ... Bn.Sampling resistor Rs1, Rs2 ... the value of Rsn guarantees to flow through the maximum current of load less than rated current, and the voltage sample feedback by a plurality of connection face terminals LED1-to LEDn-realizes multiple constant current.
All the other are identical with embodiment one, the few description.
Claims (10)
1. multichannel constant current control module, it is characterized in that, comprise a plurality of connection face terminals, multiple constant current circuit, multichannel feedback voltage comparison circuit, optical coupling isolation circuit, a plurality of connection face terminals, its each with ground between be connected No. one constant-current circuit, its each voltage signal is through one road feedback voltage comparison circuit output comparison signal, the comparison signal of described multichannel feedback voltage comparison circuit output is all transported to the input of optical coupling isolation circuit, the output output feedback signal of optical coupling isolation circuit.
2. module according to claim 1 is characterized in that: between the input of described each connection face terminals and feedback voltage comparison circuit the sampled voltage drive circuit is set.
3. module according to claim 2 is characterized in that: described sampled voltage drive circuit is the operational amplifier amplifying circuit, perhaps, is transistor amplifier.
4. module according to claim 2, it is characterized in that: comprise that also connects a power supply terminal, described multichannel feedback voltage comparison circuit increases by one the tunnel again, and the voltage signal that connects power supply terminal is through the input of this feedback voltage comparison circuit output comparison signal to optical coupling isolation circuit.
5. module according to claim 1, it is characterized in that: comprise that also connects a power supply terminal, described multichannel feedback voltage comparison circuit increases by one the tunnel again, and the voltage signal that connects power supply terminal is through the input of this feedback voltage comparison circuit output comparison signal to optical coupling isolation circuit.
6. according to each described module of claim 1 to 5, it is characterized in that: described feedback voltage comparison circuit comprises operational amplifier, a corresponding voltage signal of input input of operational amplifier, and another input connects reference voltage; Perhaps, described feedback voltage comparison circuit comprises voltage adjustment TL431, and voltage is adjusted the corresponding voltage signal of input input of TL431.
7. according to each described module of claim 1 to 5, it is characterized in that: described constant-current circuit comprises the sampling resistor that is connected between connection face terminals and the ground.
8. according to each described module of claim 1 to 5, it is characterized in that: described constant-current circuit comprises electric current and adjusts element, sampling resistor, voltage comparator circuit, electric current is connected between connection face terminals and the ground after adjusting element and sampling resistor series connection, electric current is adjusted the input of the voltage signal input voltage comparison circuit of element and sampling resistor tie point, and the output output comparison signal of voltage comparator circuit is adjusted the control end of element to electric current.
9. module according to claim 8, it is characterized in that: described voltage comparator circuit comprises operational amplifier, an input input current of operational amplifier is adjusted the voltage signal of element and sampling resistor tie point, and another input connects reference voltage.
10. module according to claim 8 is characterized in that: it is field effect transistor that described electric current is adjusted element, and the control end that this electric current is adjusted element is the grid of field effect transistor; Perhaps, it is triode that described electric current is adjusted element, and the control end that this electric current is adjusted element is the base stage of triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202960151U CN201571240U (en) | 2009-12-31 | 2009-12-31 | Multichannel constant-current control module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202960151U CN201571240U (en) | 2009-12-31 | 2009-12-31 | Multichannel constant-current control module |
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| CN201571240U true CN201571240U (en) | 2010-09-01 |
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| CN2009202960151U Expired - Lifetime CN201571240U (en) | 2009-12-31 | 2009-12-31 | Multichannel constant-current control module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105468068A (en) * | 2015-11-25 | 2016-04-06 | 广东工业大学 | Special constant current source for measurement of semiconducting material high-temperature thermoelectric property and control method for same |
-
2009
- 2009-12-31 CN CN2009202960151U patent/CN201571240U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105468068A (en) * | 2015-11-25 | 2016-04-06 | 广东工业大学 | Special constant current source for measurement of semiconducting material high-temperature thermoelectric property and control method for same |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100901 |