CN103052243A - Lamp brightness regulation circuit - Google Patents
Lamp brightness regulation circuit Download PDFInfo
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- CN103052243A CN103052243A CN2013100200836A CN201310020083A CN103052243A CN 103052243 A CN103052243 A CN 103052243A CN 2013100200836 A CN2013100200836 A CN 2013100200836A CN 201310020083 A CN201310020083 A CN 201310020083A CN 103052243 A CN103052243 A CN 103052243A
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Abstract
The embodiment of the invention discloses an LED (Light Emitting Diode) lamp brightness regulation circuit. The circuit comprises a voltage conversion circuit, a feedback circuit, a control circuit and a plurality of loads, wherein the voltage conversion circuit receives an input voltage, and is provided with at least one triode; the feedback circuit is connected with an output end of the voltage conversion circuit; the control circuit is respectively connected with an output end of the feedback circuit and the voltage conversion circuit; the loads are connected with the output end of the feedback circuit; the feedback circuit inputs a voltage signal from the output end of the voltage conversion circuit to the control circuit as a feedback signal; and the control circuit converts the feedback signal transmitted by the feedback circuit to a PWM (Pulse Width Modulation) signal, controls the work state of at least one triode in the voltage conversion circuit according to the PWM signal so as to control an output voltage of the voltage conversion circuit, so that the voltage conversion circuit inputs the controlled output voltage to the plurality of loads connected in series with the feedback circuit. According to the invention, the production cost of the LED lamp brightness regulation circuit is lowered, and the size of the LED lamp brightness regulation circuit is reduced.
Description
Technical field
The present invention relates to LED technical field (Light Emitting Diode, light-emitting diode), more particularly, relate to a kind of LED lamp brightness regulating circuit.
Background technology
The circuit of LED lamp brightness regulating circuit for the luminosity of LED is regulated, it is significant in the practical application of LED light fixture.At present, LED lamp brightness regulating circuit mainly adopts the mode of circuit feedback, the voltage signal before the input LED load is boosted processings, step-down processing, constant voltage are processed, constant current is processed, thereby realizes the luminosity adjusting of load.
Fig. 1 is the circuit block diagram of the LED lamp brightness regulating circuit of prior art, as seen in Figure 1, the LED lamp brightness regulating circuit of prior art can carry out brightness regulation to Multi-path LED load, but the brightness regulation for each load, prior art all has special voltage conversion circuit, control circuit, feedback circuit carries out mate-assist, this is so that the LED lamp brightness regulating circuit of prior art, in the process that realizes the multichannel loading brightness regulation, need to use more electronic component, so that the production cost of LED lamp brightness regulating circuit is higher, and the volume of LED lamp brightness regulating circuit is larger.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of LED lamp brightness regulating circuit, and is higher with the production cost that solves existing LED lamp brightness regulating circuit, and the larger problem of volume.
For achieving the above object, the embodiment of the invention provides following technical scheme:
A kind of LED lamp brightness regulating circuit comprises: receive the voltage conversion circuit of input voltage, described voltage conversion circuit has at least one triode; The feedback circuit that joins with the current output terminal of described voltage conversion circuit, the control circuit that joins with described feedback circuit and described voltage conversion circuit respectively, the current output terminal of described control circuit and described feedback circuit joins; A plurality of loads of joining with the current output terminal of described feedback circuit;
Wherein, described feedback circuit is inputted described control circuit with the voltage signal of described voltage conversion circuit output as feedback signal;
The feedback signal that described control circuit is carried described feedback circuit is converted to pwm signal, according to described pwm signal the operating state of at least one triode in the described voltage conversion circuit is controlled, to control the output voltage of described voltage conversion circuit, so that described voltage conversion circuit is connected in series controlled output voltage input with described feedback circuit described a plurality of loads.
Wherein, described voltage conversion circuit comprises: the first triode, the first diode, the first inductance, the second triode, the second diode and the first electric capacity;
Wherein, the source electrode of described the first triode connects external power supply, receives input voltage, and the grid of described the first triode and described control circuit join, and drain electrode is joined with the negative electrode of described the first diode and an end of the first inductance respectively; The plus earth of described the first diode; The drain electrode of the other end of described the first inductance and described the second triode is joined; The positive pole of the drain electrode of described the second triode and described the second diode joins, and grid and described control circuit join source ground; The negative electrode of described the second diode respectively with the input of described feedback circuit, an end of described the first electric capacity joins; The end that the negative electrode of described the first electric capacity and described the second diode joins also joins with described control circuit, the other end ground connection of described the first electric capacity.
Wherein, described control circuit comprises: NAND gate and single-chip microcomputer;
The first input end of described NAND gate and described single-chip microcomputer join, and the second input and described first input end join, and the grid of output and described the first triode joins; Described single-chip microcomputer respectively with the grid of described the second triode, an earth-free end of described the first electric capacity, the output of described feedback circuit joins.
Wherein, described feedback circuit comprises: the first resistance, the negative electrode of described the first resistor current input and described the second diode joins, current output terminal respectively with described single-chip microcomputer, and the current input terminal of described a plurality of loads joins.
Wherein, the described pwm signal of described foundation is controlled the operating state of at least one triode in the described voltage conversion circuit and is comprised:
When described the first resistance feedback was zero for the magnitude of voltage of described single-chip microcomputer, described the second triode of described Single-chip Controlling turn-offed, and described single-chip microcomputer is controlled described the first triode by described NAND gate and opened with minimum pulse width, works with the step-down form;
If after described the first triode is with the work of step-down form, described the first resistance feedback does not reach preset value for the magnitude of voltage of described single-chip microcomputer, then described single-chip microcomputer is controlled described the first triode increase pulsewidth by described NAND gate, until described the first resistance feedback reaches described preset value for the magnitude of voltage of described single-chip microcomputer;
If when the pwm value of described the first triode reaches maximum, described the first resistance feedback does not reach described preset value for the magnitude of voltage of described single-chip microcomputer, described single-chip microcomputer is in the peaked situation at the pwm value of described the first triode, control described the second triode and open with minimum pulse width, with the form work of boosting;
If after described the second triode is with the form work of boosting, described the first resistance feedback does not reach preset value for the magnitude of voltage of described single-chip microcomputer, then described the second triode of described Single-chip Controlling increases pulsewidth, until described the first resistance feedback reaches described preset value for the magnitude of voltage of described single-chip microcomputer.
Wherein, described LED lamp brightness regulating circuit also comprises: the regulating circuit that joins with described control circuit;
Described regulating circuit is inputted described control circuit with the conditioning signal that generates, so that the operating state of the corresponding adjusting with the conditioning signal that receives of described control circuit control device.
Wherein, the conditioning signal that described regulating circuit generates is corresponding with the output voltage of described voltage conversion circuit, described regulating circuit is inputted described control circuit with the conditioning signal that generates, so that described control circuit is converted to corresponding pwm signal with described conditioning signal, according to described pwm signal the operating state of at least one triode in the described voltage conversion circuit is controlled, control the magnitude of voltage of the output voltage of described voltage conversion circuit, corresponding with described conditioning signal.
Wherein, described control circuit also joins with described a plurality of loads;
The quantity of described regulating circuit is identical with the quantity of described a plurality of loads, the corresponding load of conditioning signal that regulating circuit generates, each regulating circuit is inputted described control circuit with the conditioning signal that generates, so that described control circuit is controlled the operating state of corresponding load.
Wherein, described a plurality of load comprises: the first load and the second load; The regulating circuit identical with the quantity of described a plurality of loads comprises: the first regulating circuit and the second regulating circuit; Described the first regulating circuit comprises: the first slide rheostat; Described the second regulating circuit comprises: the second slide rheostat; Corresponding the first load of the conditioning signal that described the first regulating circuit generates, corresponding the second load of the conditioning signal that described the second regulating circuit generates; Described conditioning signal is that the resistance of slide rheostat changes the analog signal that generates;
Described voltage conversion circuit comprises: the first triode, the first diode, the first inductance, the second triode, the second diode and the first electric capacity; The external input voltage of described the first triode source electrode, the grid of described the first triode and described control circuit join, and drain electrode is joined with the negative electrode of described the first diode and an end of described the first inductance respectively; The plus earth of described the first diode; The drain electrode of the other end of described the first inductance and described the second triode is joined; The positive pole of the drain electrode of described the second triode and described the second diode joins, and grid and described control circuit join source ground; The negative electrode of described the second diode respectively with the input of described feedback circuit, an end of described the first electric capacity joins; The end that the negative electrode of described the first electric capacity and described the second diode joins also joins with described control circuit, the other end ground connection of described the first electric capacity;
Described control circuit comprises: NAND gate, single-chip microcomputer, the 3rd triode and the 4th triode; The first input end of described NAND gate and described single-chip microcomputer join, and the second input is joined with described the first input, and the grid of output and described the first triode joins; Described single-chip microcomputer respectively with described the first slide rheostat, described the second slide rheostat, the grid of described the second triode, an earth-free end of described the first electric capacity, the output of described feedback circuit, the grid of described the 3rd triode, the grid of described the 4th triode joins; The current output terminal of the drain electrode of described the 3rd triode and described the first load joins, source ground; The current output terminal of the drain electrode of described the 4th triode and described the second load joins, source ground;
Described feedback circuit comprises: the first resistance, the negative electrode of described the first resistor current input and described the second diode joins, current output terminal respectively with described single-chip microcomputer, and the current input terminal of described a plurality of loads joins.
Wherein, described each regulating circuit is inputted described control circuit with the conditioning signal that generates, and comprises so that described control circuit is controlled the operating state of corresponding load:
The first slide rheostat changes the analog signal that generates with resistance and inputs described single-chip microcomputer, described single-chip microcomputer generates the pwm signal corresponding with described analog signal, described pwm signal is inputted the grid of described the 3rd triode, by controlling the operating state of described the 3rd triode, to control the working application time of the first load that links to each other with the drain electrode of described the 3rd triode.
Based on technique scheme, in the LED lamp brightness regulating circuit that the embodiment of the invention provides, control circuit is according to the voltage signal of feedback circuit feedback, generate pwm signal, thereby the output voltage by pwm signal control voltage conversion circuit, thereby before the input of a plurality of loads, form boost, step-down, constant voltage, constant current, realized the brightness regulation of LED light fixture multichannel loading.Compare the brightness regulation for each load, all want the special configuration voltage conversion circuit, control circuit, feedback circuit carries out the prior art of mate-assist, the LED lamp brightness regulating circuit that the embodiment of the invention provides is in the brightness regulation process that realizes multichannel loading, employed electronic component significantly reduces, and has reduced the production cost of LED lamp brightness regulating circuit, has reduced the volume of LED lamp brightness regulating circuit.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the circuit block diagram of the LED lamp brightness regulating circuit of prior art;
The circuit block diagram of the lamp brightness regulating circuit that Fig. 2 provides for the embodiment of the invention;
The electrical block diagram of the lamp brightness regulating circuit that Fig. 3 provides for the embodiment of the invention;
Another circuit block diagram of the lamp brightness regulating circuit that Fig. 4 provides for the embodiment of the invention;
Another circuit diagram of the lamp brightness regulating circuit that Fig. 5 provides for the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The circuit block diagram of the LED lamp brightness regulating circuit that Fig. 2 provides for the embodiment of the invention, with reference to Fig. 2, LED lamp brightness regulating circuit can comprise: voltage conversion circuit 1, feedback circuit 2, control circuit 3 and a plurality of load 4; Wherein, voltage conversion circuit 1 external power supply receives the input voltage that external power supply offers a plurality of loads 4, and the input of the current output terminal of voltage conversion circuit 1 and feedback circuit 2 joins, and has at least one triode in the voltage conversion circuit 1; The output of feedback circuit 2 respectively with control circuit 3, and the current input terminal of a plurality of loads 4 joins; Control circuit 3 joins with output and the voltage conversion circuit 1 of feedback circuit 2 respectively;
The course of work of the LED lamp brightness regulating circuit that the embodiment of the invention provides can be as follows: the voltage of feedback circuit 2 monitoring voltage change-over circuits 1 output and the voltage of load input terminal, with the monitoring voltage signal as feedback signal input control circuit 3; The feedback signal that control circuit 3 is carried feedback circuit is converted to PWM(Pulse Width Modulation, pulse width modulation) signal, according to described pwm signal the operating state of at least one triode in the voltage conversion circuit 1 is controlled; At least one triode in the voltage conversion circuit 1 is under the control of control circuit 3, to change operating state, so that the magnitude of voltage of voltage conversion circuit 1 output changes, voltage conversion circuit 1 flows to a plurality of loads 4 that are connected in series with feedback circuit 2 with the output voltage of controlled change, thereby before the input of a plurality of loads 4, form boost, step-down, constant voltage, constant current, realize the brightness regulation of LED light fixture multichannel loading.
In the LED lamp brightness regulating circuit that the embodiment of the invention provides, control circuit is according to the voltage signal of feedback circuit feedback, generate pwm signal, thereby the output voltage by pwm signal control voltage conversion circuit, thereby before the input of a plurality of loads, form boost, step-down, constant voltage, constant current, realized the brightness regulation of LED light fixture multichannel loading.Compare the brightness regulation for each load, all want the special configuration voltage conversion circuit, control circuit, feedback circuit carries out the prior art of mate-assist, the LED lamp brightness regulating circuit that the embodiment of the invention provides is in the brightness regulation process that realizes multichannel loading, employed electronic component significantly reduces, and has reduced the production cost of LED lamp brightness regulating circuit, has reduced the volume of LED lamp brightness regulating circuit.
The electrical block diagram of the lamp brightness regulating circuit that Fig. 3 provides for the embodiment of the invention, circuit structure shown in Figure 3 is corresponding with circuit block diagram structure shown in Figure 2, but need to be appreciated that circuit structure shown in Figure 3 only is a kind of optional mode of circuit block diagram structure shown in Figure 2.With reference to Fig. 3, voltage conversion circuit 1 comprises: the first triode Q1, the first diode D1, the first inductance L 1, the second triode Q2, the second diode D2 and the first capacitor C 1; Feedback circuit 2 can comprise: the first resistance R 1; Control circuit 3 can comprise: NAND gate U and single-chip microcomputer P; A plurality of loads can be LED multi-path, and optional single-chip microcomputer P can make the ATMEGA8 single-chip microcomputer.
Wherein, the source electrode of the first triode Q1 connects external power supply, receives input voltage; The grid of the first triode Q1 and control circuit 3 join, and be concrete, and the output of the grid of the first triode Q1 and NAND gate U joins, and the drain electrode of the first triode Q1 is joined with the negative electrode of the first diode D1 and an end of the first inductance L 1 respectively; The plus earth of the first diode D1; The drain electrode of the other end of the first inductance L 1 and the second triode Q2 is joined; The drain electrode of the second triode Q2 is also joined with the positive pole of the second diode D2, and the grid of the second triode Q2 and control circuit 3 join, and be concrete, and the grid of the second triode Q2 and single-chip microcomputer P join, the source ground of the second triode Q2; The negative electrode of the second diode D2 respectively with the input of the first resistance R 1, an end of the first capacitor C 1 joins; The end that the negative electrode of the first capacitor C 1 and the second diode D2 joins also joins with control circuit 3, and is concrete, can join with single-chip microcomputer P the other end ground connection of the first capacitor C 1;
The first input end of NAND gate U and single-chip microcomputer P join, and the second input and first input end join, and the output of NAND gate U and voltage conversion circuit 1 join, and be concrete, can join with the grid of the first triode Q1; Single-chip microcomputer P respectively with the grid of the second triode Q2, an earth-free end of the first capacitor C 1, the output of the first resistance R 1 joins;
The output of the first resistance R 1 respectively with single-chip microcomputer P, and the current input terminal of a plurality of loads 4 joins.
Lamp brightness regulating circuit shown in Figure 3, realize that the process of load brightness regulation is specific as follows: the first resistance R 1 detects the output voltage of voltage conversion circuit 1 and the voltage of load input terminal, and the voltage signal that detects is fed back to single-chip microcomputer P; When the magnitude of voltage that feeds back to single-chip microcomputer P when the first resistance R 1 was zero, single-chip microcomputer P controlled the second triode Q2 and turn-offs, and single-chip microcomputer P output pwm signal is controlled the first triode Q1 by NAND gate U and opened with minimum pulse width, works with the step-down form; After the first triode Q1 is with the work of step-down form, the magnitude of voltage that the first resistance R 1 feeds back to single-chip microcomputer P does not reach preset value, single-chip microcomputer P output pwm signal then, control the first triode Q1 by NAND gate and increase pulsewidth, reach described preset value until the first resistance R 1 feeds back to the magnitude of voltage of single-chip microcomputer P; When the pwm value at the first triode Q1 reaches maximum, if the first resistance R 1 feeds back to the magnitude of voltage of single-chip microcomputer P and does not reach described preset value, then single-chip microcomputer P is in the peaked situation at the pwm value of the first triode Q1, control the second triode Q2 and open with minimum pulse width, with the form work of boosting; When after the second triode Q2 is with the form work of boosting, the magnitude of voltage that the first resistance R 1 feeds back to single-chip microcomputer P does not reach preset value, then single-chip microcomputer P controls the second triode Q2 increase pulsewidth, reaches described preset value until the first resistance R 1 feeds back to the magnitude of voltage of single-chip microcomputer P.
Describe by epimere, lamp brightness regulating circuit shown in Figure 3 can form constant voltage before the input of a plurality of loads, realizes the constant voltage purpose; Realize the constant current purpose therewith in like manner, single-chip microcomputer can be judged load current condition by the feedback signal of the first resistance, then enters constant current state when load current is excessive.
Another circuit block diagram of the lamp brightness regulating circuit that Fig. 4 provides for the embodiment of the invention, in conjunction with Fig. 2 and shown in Figure 4, lamp brightness regulating circuit shown in Figure 4 also comprises: regulating circuit 5, regulating circuit 5 joins with control circuit 3, regulating circuit 5 is with the conditioning signal input control circuit 3 that generates, so that the operating state of the corresponding adjusting with the conditioning signal that receives of control circuit 3 controls device.In the embodiment of the invention, conditioning signal can be the input signal of lamp brightness regulating circuit, and it can be switching signal, digital signal, analog signal.
The adjusting device that conditioning signal is corresponding can be the device in the voltage conversion circuit 1, also can be load.
First kind of way can be, the conditioning signal that regulating circuit 5 generates is corresponding with the output voltage of voltage conversion circuit 1, regulating circuit 5 is with the conditioning signal input control circuit 3 that generates, so that control circuit 3 is converted to corresponding pwm signal with this conditioning signal, according to this pwm signal the operating state of at least one triode in the voltage conversion circuit 1 is controlled, the magnitude of voltage of the output voltage of control voltage conversion circuit 1 is corresponding with this conditioning signal.Be slide rheostat as regulating circuit can be set, the resistance by slide rheostat changes sends analog signal to control circuit 3, thereby so that control circuit 3 changes the voltage output value of voltage conversion circuits 1.
The second way can be that the adjusting device that conditioning signal is corresponding is load.Operating state by the regulating circuit regulating load.For this situation, the quantity that regulating circuit 5 can be set is identical with the quantity of a plurality of loads 4, and the corresponding load of conditioning signal that regulating circuit generates makes control circuit 3 and a plurality of loads 4 join simultaneously; The conditioning signal input control circuit 5 that each regulating circuit is generated is so that the operating state of the corresponding load of control circuit 5 controls.
The third mode can be that the adjusting device that conditioning signal is corresponding is load.Operating state by the regulating circuit regulating load.For this situation, the quantity that regulating circuit 5 can be set is more than one.The total working state of the corresponding a plurality of loads of conditioning signal that regulating circuit generates, the in addition ratio of the corresponding a plurality of loaded work piece states of conditioning signal that regulating circuit generates.
With reference to Fig. 5, another circuit diagram of the lamp brightness regulating circuit that Fig. 5 provides for the embodiment of the invention, it shows a kind of optional mode of the operating state of regulating circuit regulating load, and for ease of describing, the quantity that Fig. 5 chooses a plurality of loads 4 is two; Voltage conversion circuit 1 comprises: the first triode Q1, the first diode D1, the first inductance L 1, the second triode Q2, the second diode D2 and the first capacitor C 1; Feedback circuit 2 can comprise: the first resistance R 1; Control circuit 3 comprises: NAND gate U, single-chip microcomputer P, the 3rd triode Q3, and the 4th triode Q4; A plurality of loads 4 comprise: the first load 41 and the second load 42; Regulating circuit comprises: the first regulating circuit and the second regulating circuit, the total working state of the corresponding a plurality of loads of the conditioning signal that the first regulating circuit generates, the ratio of the corresponding a plurality of loaded work piece states of the conditioning signal that the second regulating circuit generates, wherein, the first regulating circuit comprises the first slide rheostat W1, and the second regulating circuit comprises the second slide rheostat W2; A plurality of loads are LED multi-path; Optional single-chip microcomputer P can be the ATMEGA8 single-chip microcomputer.
Wherein, the source electrode of the first triode Q1 connects external power supply, receive input voltage, the grid of the first triode Q1 and control circuit 3 join, concrete, the output of the grid of the first triode Q1 and NAND gate U joins, and the drain electrode of the first triode Q1 is joined with the negative electrode phase of the first diode D1 and an end of the first inductance L 1 respectively; The plus earth of the first diode D1; The drain electrode of the other end of the first inductance L 1 and the second triode Q2 is joined; The drain electrode of the second triode Q2 is also joined with the positive pole of the second diode D2, and the grid of the second triode Q2 and control circuit 3 join, and be concrete, and the grid of the second triode Q2 and single-chip microcomputer P join, the source ground of the second triode Q2; The negative electrode of the second diode D2 respectively with the input of the first resistance R 1, an end of the first capacitor C 1 joins; The end that the negative electrode of the first capacitor C 1 and the second diode D2 joins also joins with control circuit 3, and is concrete, can join with single-chip microcomputer P the other end ground connection of the first capacitor C 1;
The first input end of NAND gate U and single-chip microcomputer P join, and the second input and first input end join, and the output of NAND gate U and voltage conversion circuit 1 join, and be concrete, can join with the grid of the first triode Q1; Single-chip microcomputer P respectively with the first slide rheostat W1, the second slide rheostat W2, the grid of the second triode Q2, an earth-free end of the first capacitor C 1, the output of the first resistance R 1, the grid of the 3rd triode Q3, and the grid of the 4th triode Q4 joins; The current output terminal of the drain electrode of the 3rd triode Q3 and the first load 41 joins, the source ground of the 3rd triode Q3; The current output terminal of the drain electrode of the 4th triode Q4 and the second load 42 joins, the source ground of the 4th triode Q4;
The output of the first resistance R 1 respectively with single-chip microcomputer P, the current input terminal of the first load 41, and the current input terminal of the second load 42 joins.
Process and the circuit shown in Figure 2 of the realization load brightness regulation of lamp brightness regulating circuit shown in Figure 5 are similar, but cross-reference repeats no more herein; Lamp brightness regulating circuit shown in Figure 5 can be as follows by the process of the operating state of regulating circuit regulating load: the first slide rheostat W1 changes resistance the analog signal input single-chip microcomputer P that generates, single-chip microcomputer P generates the pwm signal corresponding with this analog signal, this pwm signal is input to respectively the grid of the 3rd triode Q3 and the grid of the 4th triode Q4, operating state by controlling the 3rd triode Q3 and the operating state of the 4th triode Q4, the working application time of the second load 42 that links to each other with the drain electrode of the working application time of the first load 41 of linking to each other with the drain electrode of the 3rd triode Q3 of control and the 4th triode Q4, thus realize the adjusting of the operating state of the adjusting of operating state of the first load 41 and the second load 42.The second slide rheostat W2 changes resistance the analog signal input single-chip microcomputer P that generates, single-chip microcomputer P generates the pwm signal corresponding with this analog signal, this pwm signal is input to respectively the grid of the 3rd triode Q3 and the grid of the 4th triode Q4, the ratio of the operating state by controlling the 3rd triode Q3 and the operating state of the 4th triode Q4, the ratio of the working application time of the second load 42 that links to each other with the drain electrode of the working application time of the first load 41 of linking to each other with the drain electrode of the 3rd triode Q3 of control and the 4th triode Q4, thus realize the adjusting of the operating state of the first load 41 and the second load 42.
The below shows the first slide rheostat W1, the second slide rheostat W2, the operating state of the 3rd triode Q3 and the 4th triode Q4, relation with the working application time ratio of the first load 41 and the second load 42, represent the first load 41 with FA, FB represents the second load 42, and optional the first load and the second load are 10W(watt) light-emitting diode, the operating state of the 3rd triode Q3 and the 4th triode Q4 is specially conducting and off-state.
When W1 was adjusted to 100%, when W2 was 100%, Q3 opens 100%, Q4, and to open 0%, FA be 10W, and FB is 0W, and total work is 10W;
When W1 was adjusted to 100%, when W2 was 0%, Q3 opens 0%, Q4, and to open 100%, FA be 0W, and FB is 10W, and total work is 10W;
When W1 was adjusted to 100%, when W2 was 50%, Q3 opens 50%, Q4, and to open 50%, FA be 5W, and FB is 5W, and total work is 10W;
When W1 was adjusted to 100%, when W2 was 25%, Q3 opens 25%, Q4, and to open 75%, FA be 2.5W, and FB is 7.5W, and total work is 10W;
When W1 was adjusted to 50%, when W2 was 100%, Q3 opens 50%, Q4, and to open 0%, FA be 5W, and FB is 0W, and total work is 5W;
When W1 was adjusted to 50%, when W2 was 0%, Q3 opens 0%, Q4, and to open 50%, FA be 0W, and FB is 5W, and total work is 5W;
When W1 was adjusted to 50%, when W2 was 50%, Q3 opens 25%, Q4, and to open 25%, FA be 2.5W, and FB is 2.5W, and total work is 5W;
When W1 was adjusted to 50%, when W2 was 25%, Q3 opens 25%, Q4, and to open 75%, FA be 1.25W, and FB is 3.75W, and total work is 5W.
Optionally, the operating state that the conditioning signal that the first regulating circuit shown in Figure 5 generates can corresponding the first load, the operating state that the conditioning signal that the second regulating circuit generates can corresponding the second load.The first slide rheostat W1 changes resistance the analog signal input single-chip microcomputer P that generates, single-chip microcomputer P generates the pwm signal corresponding with described analog signal, described pwm signal is inputted the grid of the 3rd triode Q3, by controlling the operating state of the 3rd triode Q3, to control the working application time of the first load 41 that links to each other with the drain electrode of the 3rd triode Q3.The control of the working application time of the second load 42 and the first load are similar, repeat no more herein.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can in the situation that does not break away from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a lamp brightness regulating circuit is characterized in that, comprising: receive the voltage conversion circuit of input voltage, described voltage conversion circuit has at least one triode; The feedback circuit that joins with the current output terminal of described voltage conversion circuit, the control circuit that joins with described feedback circuit and described voltage conversion circuit respectively, the current output terminal of described control circuit and described feedback circuit joins; A plurality of loads of joining with the current output terminal of described feedback circuit;
Wherein, described feedback circuit is inputted described control circuit with the voltage signal of described voltage conversion circuit output as feedback signal;
The feedback signal that described control circuit is carried described feedback circuit is converted to the pulse width modulation (PWM) signal, according to described pwm signal the operating state of at least one triode in the described voltage conversion circuit is controlled, to control the output voltage of described voltage conversion circuit, so that described voltage conversion circuit is connected in series controlled output voltage input with described feedback circuit described a plurality of loads.
2. lamp brightness regulating circuit according to claim 1 is characterized in that, described voltage conversion circuit comprises: the first triode, the first diode, the first inductance, the second triode, the second diode and the first electric capacity;
Wherein, the source electrode of described the first triode connects external power supply, receives input voltage, and the grid of described the first triode and described control circuit join, and drain electrode is joined with the negative electrode of described the first diode and an end of the first inductance respectively; The plus earth of described the first diode; The drain electrode of the other end of described the first inductance and described the second triode is joined; The positive pole of the drain electrode of described the second triode and described the second diode joins, and grid and described control circuit join source ground; The negative electrode of described the second diode respectively with the input of described feedback circuit, an end of described the first electric capacity joins; The end that the negative electrode of described the first electric capacity and described the second diode joins also joins with described control circuit, the other end ground connection of described the first electric capacity.
3. lamp brightness regulating circuit according to claim 2 is characterized in that, described control circuit comprises: NAND gate and single-chip microcomputer;
The first input end of described NAND gate and described single-chip microcomputer join, and the second input and described first input end join, and the grid of output and described the first triode joins; Described single-chip microcomputer respectively with the grid of described the second triode, an earth-free end of described the first electric capacity, the output of described feedback circuit joins.
4. lamp brightness regulating circuit according to claim 3, it is characterized in that, described feedback circuit comprises: the first resistance, the negative electrode of described the first resistor current input and described the second diode joins, current output terminal respectively with described single-chip microcomputer, and the current input terminal of described a plurality of loads joins.
5. lamp brightness regulating circuit according to claim 4 is characterized in that, described control circuit is controlled the operating state of at least one triode in the described voltage conversion circuit according to described pwm signal in such a way:
When described the first resistance feedback was zero for the magnitude of voltage of described single-chip microcomputer, described the second triode of described Single-chip Controlling turn-offed, and described single-chip microcomputer is controlled described the first triode by described NAND gate and opened with minimum pulse width, works with the step-down form;
If after described the first triode is with the work of step-down form, described the first resistance feedback does not reach preset value for the magnitude of voltage of described single-chip microcomputer, then described single-chip microcomputer is controlled described the first triode increase pulsewidth by described NAND gate, until described the first resistance feedback reaches described preset value for the magnitude of voltage of described single-chip microcomputer;
If when the pwm value of described the first triode reaches maximum, described the first resistance feedback does not reach described preset value for the magnitude of voltage of described single-chip microcomputer, described single-chip microcomputer is in the peaked situation at the pwm value of described the first triode, control described the second triode and open with minimum pulse width, with the form work of boosting;
If after described the second triode is with the form work of boosting, described the first resistance feedback does not reach preset value for the magnitude of voltage of described single-chip microcomputer, then described the second triode of described Single-chip Controlling increases pulsewidth, until described the first resistance feedback reaches described preset value for the magnitude of voltage of described single-chip microcomputer.
6. lamp brightness regulating circuit according to claim 1 is characterized in that, also comprises: the regulating circuit that joins with described control circuit;
Described regulating circuit is inputted described control circuit with the conditioning signal that generates, so that the operating state of the corresponding adjusting with the conditioning signal that receives of described control circuit control device.
7. lamp brightness regulating circuit according to claim 6, it is characterized in that, the conditioning signal that described regulating circuit generates is corresponding with the output voltage of described voltage conversion circuit, described regulating circuit is inputted described control circuit with the conditioning signal that generates, so that described control circuit is converted to corresponding pwm signal with described conditioning signal, according to described pwm signal the operating state of at least one triode in the described voltage conversion circuit is controlled, control the magnitude of voltage of the output voltage of described voltage conversion circuit, corresponding with described conditioning signal.
8. lamp brightness regulating circuit according to claim 6 is characterized in that, described control circuit also joins with described a plurality of loads;
The quantity of described regulating circuit is identical with the quantity of described a plurality of loads, the corresponding load of conditioning signal that regulating circuit generates, each regulating circuit is inputted described control circuit with the conditioning signal that generates, so that described control circuit is controlled the operating state of corresponding load.
9. lamp brightness regulating circuit according to claim 8 is characterized in that, described a plurality of loads comprise: the first load and the second load; The regulating circuit identical with the quantity of described a plurality of loads comprises: the first regulating circuit and the second regulating circuit; Described the first regulating circuit comprises: the first slide rheostat; Described the second regulating circuit comprises: the second slide rheostat; Corresponding the first load of the conditioning signal that described the first regulating circuit generates, corresponding the second load of the conditioning signal that described the second regulating circuit generates; Described conditioning signal is that the resistance of slide rheostat changes the analog signal that generates;
Described voltage conversion circuit comprises: the first triode, the first diode, the first inductance, the second triode, the second diode and the first electric capacity; The external input voltage of described the first triode source electrode, the grid of described the first triode and described control circuit join, and drain electrode is joined with the negative electrode of described the first diode and an end of described the first inductance respectively; The plus earth of described the first diode; The drain electrode of the other end of described the first inductance and described the second triode is joined; The positive pole of the drain electrode of described the second triode and described the second diode joins, and grid and described control circuit join source ground; The negative electrode of described the second diode respectively with the input of described feedback circuit, an end of described the first electric capacity joins; The end that the negative electrode of described the first electric capacity and described the second diode joins also joins with described control circuit, the other end ground connection of described the first electric capacity;
Described control circuit comprises: NAND gate, single-chip microcomputer, the 3rd triode and the 4th triode; The first input end of described NAND gate and described single-chip microcomputer join, and the second input is joined with described the first input, and the grid of output and described the first triode joins; Described single-chip microcomputer respectively with described the first slide rheostat, described the second slide rheostat, the grid of described the second triode, an earth-free end of described the first electric capacity, the output of described feedback circuit, the grid of described the 3rd triode, the grid of described the 4th triode joins; The current output terminal of the drain electrode of described the 3rd triode and described the first load joins, source ground; The current output terminal of the drain electrode of described the 4th triode and described the second load joins, source ground;
Described feedback circuit comprises: the first resistance, the negative electrode of described the first resistor current input and described the second diode joins, current output terminal respectively with described single-chip microcomputer, and the current input terminal of described a plurality of loads joins.
10. lamp brightness regulating circuit according to claim 9 is characterized in that, described each regulating circuit is inputted described control circuit with the conditioning signal that generates, and comprises so that described control circuit is controlled the operating state of corresponding load:
The first slide rheostat changes the analog signal that generates with resistance and inputs described single-chip microcomputer, described single-chip microcomputer generates the pwm signal corresponding with described analog signal, described pwm signal is inputted the grid of described the 3rd triode, by controlling the operating state of described the 3rd triode, to control the working application time of the first load that links to each other with the drain electrode of described the 3rd triode.
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| CN201310020083.6A CN103052243B (en) | 2013-01-18 | 2013-01-18 | Lamp brightness regulation circuit |
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| CN201310020083.6A CN103052243B (en) | 2013-01-18 | 2013-01-18 | Lamp brightness regulation circuit |
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| CN1515037A (en) * | 2002-05-07 | 2004-07-21 | ��ķ�ɷ�����˾ | Light emitting element driving device and electronic apparatus having light emitting element |
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