CN210042318U - LED drive circuit and LED lighting device based on double-circuit PWM signal - Google Patents
LED drive circuit and LED lighting device based on double-circuit PWM signal Download PDFInfo
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- CN210042318U CN210042318U CN201920832075.4U CN201920832075U CN210042318U CN 210042318 U CN210042318 U CN 210042318U CN 201920832075 U CN201920832075 U CN 201920832075U CN 210042318 U CN210042318 U CN 210042318U
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Abstract
The utility model provides a LED drive circuit and LED lighting device based on double-circuit PWM signal. The LED drive circuit based on two-way PWM signal includes: the first electrode switching circuit comprises a first PWM signal input end, a second PWM signal input end, a first electrode switching circuit and a second electrode switching circuit; the anodes of all LED lamp beads in the first LED lamp group are connected with the first electrode end, and the cathodes of all LED lamp beads in the first LED lamp group are connected with the second electrode end of the second electrode switching circuit; and when the first PWM signal and the second PWM signal are input, the electrode output by the first electrode end is opposite to the electrode output by the second electrode end, and the first LED lamp group or the second LED lamp group is lightened.
Description
Technical Field
The utility model relates to a LED lighting technology field specifically relates to a LED drive circuit and LED lighting device based on double-circuit PWM signal.
Background
The LED is called as a fourth-generation light source, has the characteristics of energy conservation, environmental protection, safety, long service life, low power consumption, high brightness, micro size, shock resistance, easiness in dimming, light beam concentration, simplicity and convenience in maintenance and the like, and can be widely applied to the fields of various indications, display, decoration, backlight sources, common illumination and the like.
Through adjusting luminance to LED, can realize multiple light-emitting effect, satisfy the requirement of different users under different situations. For example, the LED module is designed to emit light of two or three colors, and a user can select light of the corresponding color in different application scenarios.
However, if the LED module is designed to emit light of multiple colors, it is common practice to configure one driving circuit for the same color LED lamp set, and then multiple driving circuits are required for the multi-color LED module.
In fact, in many applications of LED products, the trend of miniaturization of LED products is more and more obvious. Each additional driving circuit in the LED module inevitably leads to an additional conductive wire. This makes the miniaturized LED product require space for more conductive wires during actual assembly and also increases handling during assembly. In addition, more conducting wires can also cause the increase of defective product rate caused by the nonstandard operation of workers, and the probability of faults caused by the loosening of the welding point of the conducting wire can also be increased if the LED product is in a vibration or shaking environment for a long time in the actual transportation or use process.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a LED drive circuit and LED lighting device based on double-circuit PWM signal in order to solve the shortcoming that exists among the prior art.
An LED drive circuit based on a two-way PWM signal, comprising: a first PWM signal input terminal for receiving a first PWM signal; a second PWM signal input terminal for receiving a second PWM signal; the first electrode switching circuit is connected with the first PWM signal input end, and the first PWM signal controls the first electrode end of the first electrode switching circuit to output a positive electrode or a negative electrode; the second electrode switching circuit is connected with the second PWM signal input end, and the second PWM signal controls the second electrode end of the second electrode switching circuit to output a positive electrode or a negative electrode; the anodes of all LED lamp beads in the first LED lamp group are connected with the first electrode end, and the cathodes of all LED lamp beads in the first LED lamp group are connected with the second electrode end of the second electrode switching circuit; the cathodes of all the LED lamp beads in the second LED lamp group are connected with the first electrode end, and the anodes of all the LED lamp beads in the second LED lamp group are connected with the second electrode end; when the first PWM signal and the second PWM signal are input, the electrode output by the first electrode end is opposite to the electrode output by the second electrode end, and the first LED lamp group or the second LED lamp group is lightened.
Preferably, when the first PWM signal at the first PWM signal input terminal is at a high level, the first electrode switching circuit outputs a negative electrode, and when the first PWM signal at the first PWM signal input terminal is at a low level, the first electrode switching circuit outputs a positive electrode; when the second PWM signal of the second PWM signal input terminal is at a high level, the second electrode switching circuit outputs a positive electrode, and when the second PWM signal of the second PWM signal input terminal is at a low level, the second electrode switching circuit outputs a negative electrode.
Preferably, the electrode switching circuit includes: a positive switching circuit and a negative switching circuit; the positive pole switching circuit and the negative pole switching circuit are both connected with a PWM signal input end, and when the input PWM signal is in a high level, one of the positive pole switching circuit and the negative pole switching circuit is conducted and outputs a corresponding electrode; when the input PWM signal is at low level, the other circuit of the positive pole switching circuit and the negative pole switching circuit is conducted and outputs the corresponding electrode.
Preferably, the positive electrode switching circuit includes: the base electrode of the first triode is connected with the PWM signal input end, the emitting electrode of the first triode is connected with the positive electrode of the power supply, and the collecting electrode of the first triode is connected with the grid electrode of the first MOS tube; the grid electrode of the first MOS tube is connected with the positive electrode of a power supply through a first voltage-stabilizing diode, the source electrode of the first MOS tube is directly connected with the positive electrode of the power supply, the drain electrode of the first MOS tube is connected with the electrode end, and the first voltage-stabilizing diode enables the grid electrode of the first MOS tube to be conducted to the positive electrode of the power supply in a single direction; the negative switching circuit includes: the base electrode of the second triode is connected with the PWM signal input end, the emitting electrode of the second triode is connected with the negative electrode of the power supply, and the collecting electrode of the second triode is connected with the grid electrode of the second MOS tube; the grid electrode of the second MOS tube is also connected with the emitting electrode of the second triode through a second voltage stabilizing diode, the source electrode is directly connected with the negative electrode of the power supply, the drain electrode is connected with the electrode end, and the second voltage stabilizing diode enables the emitting electrode of the second triode to be conducted to the grid electrode of the second MOS tube in a single direction; and a resistor is connected between the grid of the first MOS tube and the grid of the second MOS tube so as to enable the first MOS tube and the second MOS tube to be electrically connected.
An LED lighting device based on the LED driving circuit based on the two-way PWM signal comprises an LED light-emitting unit, a circuit board, a first lead and a second lead, wherein the first lead and the second lead are used for connecting the LED light-emitting unit and the circuit board; the first LED lamp group and the second LED lamp group are integrated in the LED light-emitting unit; the circuit board is internally integrated with the first electrode switching circuit and the second electrode switching circuit; the first lead is connected with a first electrode end of the first electrode switching circuit, and the second lead is connected with a second electrode end of the second electrode switching circuit; the anodes of all the LED lamp beads in the first LED lamp group are connected with the first lead, and the cathodes of all the LED lamp beads in the first LED lamp group are connected with the second lead; the cathodes of all the LED lamp beads in the second LED lamp group are connected with the first conducting wire, and the anodes of all the LED lamp beads in the second LED lamp group are connected with the second conducting wire.
Preferably, the LED lighting unit is a light strip, a lamp panel or a light post.
The utility model has the advantages that:
in the LED driving circuit, the LED lighting device and the driving method based on the two-way PWM signal, the anodes of all LED lamp beads in the first LED lamp group are connected with the first electrode end, and the cathodes of all LED lamp beads in the first LED lamp group are connected with the second electrode end of the second electrode switching circuit; the cathodes of all the LED lamp beads in the second LED lamp group are connected with the first electrode end, and the anodes of all the LED lamp beads in the second LED lamp group are connected with the second electrode end; after the first PWM signal and the second PWM signal are input, the electrode output by the first electrode end is opposite to the electrode output by the second electrode end, and the first LED lamp group or the second LED lamp group is lightened, so that the switching of different light-emitting effects of the light beads is realized only by switching the positive electrode and the negative electrode, the structure is simple, and the practical significance is higher.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work, wherein:
fig. 1 is a schematic circuit structure diagram of an LED driving circuit based on two-way PWM signals according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a connection structure of an LED light emitting unit and a circuit board in an LED lighting device of an LED driving circuit based on a two-way PWM signal.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, the utility model provides a LED drive circuit based on double-circuit PWM signal includes: a first PWM signal input PWM1, a first PWM signal input PWM2, a first electrode switching circuit 10, a second electrode switching circuit 20, a first LED lamp group 30, and a second LED lamp group 40.
In this embodiment, the first PWM signal input terminal PWM1 is configured to receive a first PWM signal; the second PWM signal input PWM2 is for receiving a second PWM signal. Also, the first electrode switching circuit 10 is connected to the first PWM signal input terminal PWM1, and the second electrode switching circuit 20 is connected to the second PWM signal input terminal PWM 2.
The first LED lamp group 30 and the second LED lamp group 40 are connected to the first electrode switching circuit 10 and the second electrode switching circuit 20, respectively.
Specifically, the first PWM signal controls the first electrode terminal OUT1 of the first electrode switching circuit 10 to output positive or negative electrode, and the second PWM signal controls the second electrode terminal OUT2 of the second electrode switching circuit 20 to output positive or negative electrode.
In this embodiment, when the first PWM signal of the first PWM signal input terminal PWM1 is at a high level, the first electrode switching circuit 10 outputs a negative electrode, and when the first PWM signal of the first PWM signal input terminal PWM1 is at a low level, the first electrode switching circuit 20 outputs a positive electrode;
when the second PWM signal of the second PWM signal input terminal PWM2 is at a high level, the second electrode switching circuit 20 outputs a positive electrode, and when the second PWM signal of the second PWM signal input terminal PWM2 is at a low level, the second electrode switching circuit 20 outputs a negative electrode.
Of course, not limited to this embodiment, in other alternative embodiments, when the first PWM signal of the first PWM signal input terminal PWM1 is at a high level, the first electrode switching circuit 10 outputs a positive electrode, and when the first PWM signal of the first PWM signal input terminal PWM1 is at a low level, the first electrode switching circuit 20 outputs a negative electrode; when the second PWM signal of the second PWM signal input terminal PWM2 is at a high level, the second electrode switching circuit 20 outputs a negative electrode, and when the second PWM signal of the second PWM signal input terminal PWM2 is at a low level, the second electrode switching circuit 20 outputs a positive electrode. It should be understood that the above modifications are equivalent variations of the technical solution within the scope of the present invention, which may be implemented by those skilled in the art without any inventive work, and fall within the protection scope of the present invention.
In addition, in this embodiment, the first electrode switching circuit is the same as the second electrode, and here, the specific structure of the electrode switching circuit will be described by taking the first electrode switching circuit 10 as an example.
The electrode switching circuit includes: a positive switching circuit 11 and a negative switching circuit 12. The positive pole switching circuit 11 and the negative pole switching circuit 12 are both connected to a PWM signal input terminal PWM1, when the input PWM signal is at a high level, the positive pole switching circuit 11 is in an open circuit, and the negative pole switching circuit 12 is turned on and outputs a negative pole; when the input PWM signal is at a low level, the negative electrode switching circuit 12 is in an open circuit, and the positive electrode switching circuit 11 is turned on and outputs a positive electrode.
Of course, not limited to this embodiment, in other alternative embodiments, when the input PWM signal is at a high level, the negative electrode switching circuit 12 is in an off state, and the positive electrode switching circuit 11 is turned on and outputs a positive electrode; when the input PWM signal is at a low level, the positive switching circuit 11 is in an off state, and the negative switching circuit 12 is turned on and outputs a negative. It should be understood that the above modifications are equivalent variations of the technical solution within the scope of the present invention, which may be implemented by those skilled in the art without any inventive work, and fall within the protection scope of the present invention.
Further, the positive electrode switching circuit 11 includes: the transistor comprises a first triode Q3 and a first MOS transistor Q4 which are connected with each other, wherein the base electrode of the first triode Q3 is connected with the PWM signal input end PWM1, the emitting electrode of the first triode Q3 is connected with the positive electrode VCC of a power supply, and the collecting electrode of the first triode Q4 is connected with the grid electrode of the first MOS transistor Q4; the grid of first MOS pipe Q4 still connects the positive VCC of power through first zener diode Z2, source lug connection the positive VCC of power, electrode terminal OUT1 is connected to the drain, first zener diode Z2 makes from the grid of first MOS pipe Q4 to the positive VCC unidirectional conduction of power.
The negative polarity switching circuit 12 includes: the base of the second triode Q2 is connected with the PWM signal input end PWM1, the emitter is connected with the power supply cathode GND, and the collector is connected with the grid of the second MOS tube Q1; the gate of the second MOS transistor Q1 is further connected to the emitter of the second triode Q2 through a second zener diode Z1, the source is directly connected to the negative GND of the power supply, the drain is connected to the electrode terminal OUT1, and the second zener diode Z1 makes unidirectional conduction from the emitter of the second triode Q2 to the gate of the second MOS transistor Q1;
a resistor R2 is connected between the grid of the first MOS transistor Q4 and the grid of the second MOS transistor Q1 so as to enable the two to be electrically connected.
The working principle of the electrode switching circuit is as follows:
when the PWM signal received by the PWM signal input terminal PWM1 is at a high level, the first transistor Q3 of the positive pole switching circuit 11 is in a cut-off state, and the second transistor Q2 and the second MOS transistor Q1 of the negative pole switching circuit 12 are both in a conducting state, then the negative pole switching circuit 12 outputs a negative pole;
when the PWM signal received by the PWM signal input terminal PWM1 is at a low level, the second transistor Q2 of the negative switching circuit 12 is in a cut-off state, and both the first transistor Q3 and the first MOS transistor Q4 of the positive switching circuit 11 are in a conducting state, so that the positive switching circuit 11 outputs a positive electrode.
In addition, the first LED lamp group 30 and the second LED lamp group 40 each include a plurality of LED lamp beads arranged in parallel. In addition, the anodes of all the LED lamp beads in the first LED lamp group 30 are connected to the first electrode terminal OUT1, and the cathodes of all the LED lamp beads in the first LED lamp group 30 are connected to the second electrode terminal OUT 2; the cathodes of all the LED lamp beads in the second LED lamp group 40 are connected with the first electrode end OUT1, and the anodes of all the LED lamp beads in the second LED lamp group 40 are connected with the second electrode end OUT 2.
When the first PWM signal and the second PWM signal are input, the electrode output from the first electrode terminal OUT1 is opposite to the electrode output from the second electrode terminal OUT2, and the first LED lamp set 30 or the second LED lamp set 40 is turned on.
In this embodiment, the operation principle of the LED driving circuit based on two-way PWM signal shown in fig. 1 is as follows:
if the first LED lamp group 30 needs to be turned on, the first PWM signal input terminal PWM1 is controlled to obtain a first PWM signal with a low level, and the second PWM signal input terminal PWM2 is controlled to obtain a second PWM signal with a high level, so that the first electrode terminal OUT1 of the first electrode switching circuit 10 outputs a positive electrode, and the second electrode terminal OUT2 of the second electrode switching circuit 20 outputs a negative electrode;
if the second LED lamp group 40 needs to be turned on, the first PWM signal input terminal PWM1 is controlled to obtain a first PWM signal with a high level, and the second PWM signal input terminal PWM2 is controlled to obtain a second PWM signal with a low level, so that the first electrode terminal OUT1 of the first electrode switching circuit 10 outputs a negative electrode, and the second electrode terminal OUT2 of the second electrode switching circuit 20 outputs a positive electrode;
if the first LED lamp group 30 and the second LED lamp group 40 need to be alternately turned on, the periods of the first PWM signal and the second PWM signal are controlled to be synchronous and the same, the high-level and low-level switching frequency of the first PWM signal and the second PWM signal is adjusted, and in one signal period, the first PWM signal and the second PWM signal are always in the opposite state of the high-level and the low-level, so that the first LED lamp group 30 and the second LED lamp group 40 alternately emit light, and stepless color matching is realized.
A driving method based on a double-path PWM signal LED driving circuit shown in figure 1 comprises the following steps:
controlling the first PWM signal input terminal PWM1 to obtain a first PWM signal with a low level, and controlling the second PWM signal input terminal PWM2 to obtain a second PWM signal with a high level, so that the first electrode terminal OUT1 of the first electrode switching circuit 10 outputs a positive electrode, the second electrode terminal OUT2 of the second electrode switching circuit 20 outputs a negative electrode, and then the first LED lamp set 30 is turned on;
controlling the first PWM signal input terminal PWM1 to obtain a first PWM signal with a high level, and controlling the second PWM signal input terminal PWM2 to obtain a second PWM signal with a low level, so that the first electrode terminal OUT1 of the first electrode switching circuit 10 outputs a negative electrode, the second electrode terminal OUT2 of the second electrode switching circuit 20 outputs a positive electrode, and then the second LED lamp group 40 is turned on;
the method comprises the steps of controlling the periods of a first PWM signal and a second PWM signal to be synchronous and the same, adjusting the high-level and low-level switching frequency of the first PWM signal and the second PWM signal, and enabling the first PWM signal and the second PWM signal to be in opposite states of high level and low level all the time in a signal period, so that a first LED lamp group 30 and a second LED lamp group 40 emit light alternately, and stepless color mixing is achieved.
For example, in one period, the first PWM signal is high level in the first half period, and the first PWM signal is low level in the second half period; and the second PWM signal is low level in the first half period and high level in the second half period.
As shown in fig. 1, an LED lighting device based on the LED driving circuit based on the two-way PWM signal shown in fig. 1 includes an LED light emitting unit 110, a circuit board 120, and a first wire 130 and a second wire 140 connecting the LED light emitting unit 110 and the circuit board 120.
Wherein the first LED lamp group 30 and the second LED lamp group 40 are integrated in the LED lighting unit 110. Alternatively, the LED lighting unit 110 may be a light strip, a lamp panel or a lamp post.
The first electrode switching circuit 10 and the second electrode switching circuit 20 are integrated in the circuit board 120. Also, the first wire 130 is connected to the first electrode terminal OUT1 of the first electrode switching circuit 10, and the second wire 140 is connected to the second electrode terminal OUT2 of the second electrode switching circuit 20.
In addition, the anodes of all the LED lamp beads in the first LED lamp group 30 are connected to the first conducting wire 130, and the cathodes of all the LED lamp beads in the first LED lamp group 30 are connected to the second conducting wire 140; the cathodes of all the LED bulbs in the second LED lamp group 40 are connected to the first conducting wire 130, and the anodes of all the LED bulbs in the second LED lamp group 40 are connected to the second conducting wire 130.
It should be noted that only two conductive wires 130, 140 are needed between the LED light emitting unit 110 and the circuit board 120 to complete electrical connection, and one conductive wire is reduced compared with a commercially available multi-color LED module, thereby further contributing to the miniaturization of LED products, further improving the product assembly efficiency, and reducing the defective product rate and the product failure rate.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all of which utilize the equivalent structure or equivalent flow transformation made by the content of the specification of the present invention, or directly or indirectly applied to other related technical fields, all included in the same way in the patent protection scope of the present invention.
Claims (6)
1. An LED drive circuit based on two-way PWM signals, characterized by comprising:
a first PWM signal input terminal for receiving a first PWM signal;
a second PWM signal input terminal for receiving a second PWM signal;
the first electrode switching circuit is connected with the first PWM signal input end, and the first PWM signal controls the first electrode end of the first electrode switching circuit to output a positive electrode or a negative electrode;
the second electrode switching circuit is connected with the second PWM signal input end, and the second PWM signal controls the second electrode end of the second electrode switching circuit to output a positive electrode or a negative electrode;
the anodes of all LED lamp beads in the first LED lamp group are connected with the first electrode end, and the cathodes of all LED lamp beads in the first LED lamp group are connected with the second electrode end;
the cathodes of all the LED lamp beads in the second LED lamp group are connected with the first electrode end, and the anodes of all the LED lamp beads in the second LED lamp group are connected with the second electrode end;
when the first PWM signal and the second PWM signal are input, the electrode output by the first electrode end is opposite to the electrode output by the second electrode end, and the first LED lamp group or the second LED lamp group is lightened.
2. The LED driving circuit according to claim 1, wherein the first electrode switching circuit outputs a negative electrode when the first PWM signal at the first PWM signal input terminal is at a high level, and outputs a positive electrode when the first PWM signal at the first PWM signal input terminal is at a low level;
when the second PWM signal of the second PWM signal input terminal is at a high level, the second electrode switching circuit outputs a positive electrode, and when the second PWM signal of the second PWM signal input terminal is at a low level, the second electrode switching circuit outputs a negative electrode.
3. The dual PWM signal based LED driving circuit according to claim 1, wherein the electrode switching circuit comprises: a positive switching circuit and a negative switching circuit;
the positive pole switching circuit and the negative pole switching circuit are both connected with a PWM signal input end, and when the input PWM signal is in a high level, one of the positive pole switching circuit and the negative pole switching circuit is conducted and outputs a corresponding electrode;
when the input PWM signal is at low level, the other circuit of the positive pole switching circuit and the negative pole switching circuit is conducted and outputs the corresponding electrode.
4. The dual PWM signal based LED driving circuit according to claim 3, wherein the positive switching circuit comprises: the base electrode of the first triode is connected with the PWM signal input end, the emitting electrode of the first triode is connected with the positive electrode of the power supply, and the collecting electrode of the first triode is connected with the grid electrode of the first MOS tube; the grid electrode of the first MOS tube is connected with the positive electrode of a power supply through a first voltage-stabilizing diode, the source electrode of the first MOS tube is directly connected with the positive electrode of the power supply, the drain electrode of the first MOS tube is connected with the electrode end, and the first voltage-stabilizing diode enables the grid electrode of the first MOS tube to be conducted to the positive electrode of the power supply in a single direction;
the negative switching circuit includes: the base electrode of the second triode is connected with the PWM signal input end, the emitting electrode of the second triode is connected with the negative electrode of the power supply, and the collecting electrode of the second triode is connected with the grid electrode of the second MOS tube; the grid electrode of the second MOS tube is also connected with the emitting electrode of the second triode through a second voltage stabilizing diode, the source electrode is directly connected with the negative electrode of the power supply, the drain electrode is connected with the electrode end, and the second voltage stabilizing diode enables the emitting electrode of the second triode to be conducted to the grid electrode of the second MOS tube in a single direction;
and a resistor is connected between the grid of the first MOS tube and the grid of the second MOS tube so as to enable the first MOS tube and the second MOS tube to be electrically connected.
5. An LED lighting device based on the LED driving circuit based on the two-way PWM signal according to any one of claims 1 to 4, comprising an LED light-emitting unit, a circuit board, and a first wire and a second wire for connecting the LED light-emitting unit and the circuit board;
the first LED lamp group and the second LED lamp group are integrated in the LED light-emitting unit;
the circuit board is internally integrated with the first electrode switching circuit and the second electrode switching circuit;
the first lead is connected with a first electrode end of the first electrode switching circuit, and the second lead is connected with a second electrode end of the second electrode switching circuit;
the anodes of all the LED lamp beads in the first LED lamp group are connected with the first lead, and the cathodes of all the LED lamp beads in the first LED lamp group are connected with the second lead;
the cathodes of all the LED lamp beads in the second LED lamp group are connected with the first conducting wire, and the anodes of all the LED lamp beads in the second LED lamp group are connected with the second conducting wire.
6. The LED lighting device according to claim 5, wherein the LED light emitting unit is a light strip, a light panel, or a light post.
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| CN201920832075.4U CN210042318U (en) | 2019-06-01 | 2019-06-01 | LED drive circuit and LED lighting device based on double-circuit PWM signal |
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| CN201920832075.4U CN210042318U (en) | 2019-06-01 | 2019-06-01 | LED drive circuit and LED lighting device based on double-circuit PWM signal |
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