CN217770421U - LED electronic component based on power driving - Google Patents
LED electronic component based on power driving Download PDFInfo
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- CN217770421U CN217770421U CN202221232407.3U CN202221232407U CN217770421U CN 217770421 U CN217770421 U CN 217770421U CN 202221232407 U CN202221232407 U CN 202221232407U CN 217770421 U CN217770421 U CN 217770421U
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- 239000003990 capacitor Substances 0.000 claims description 40
- 238000001514 detection method Methods 0.000 claims description 21
- 230000010355 oscillation Effects 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000002955 isolation Methods 0.000 description 3
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- 239000004065 semiconductor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000010356 wave oscillation Effects 0.000 description 2
- 229910002601 GaN Inorganic materials 0.000 description 1
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 1
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- 238000004134 energy conservation Methods 0.000 description 1
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Abstract
The utility model discloses a LED electronic component based on power drive relates to power electronic technology field. The utility model discloses a plurality of LED lamps are arranged, and are connected in series in a loop through wires to form an LED lamp string; a PWM control circuit for detecting current and providing feedback; and the driving circuit is compared with an output signal of an error amplifier in the PWM control chip, and the brightness of the LED can be adjusted by adjusting the duty ratio of the driving circuit, so that the aim of dimming is fulfilled. The utility model discloses a IC chip UC3843 be that high performance fixed frequency current mode controller chip has 8 pins, and outer circuit wiring is simple, and used component is few, and the superior performance, and is with low costs, and the chip is inside to have the oscillator that can finely tune to carry out accurate duty cycle control.
Description
Technical Field
The utility model relates to a power electronic technology field, concretely relates to LED electronic component based on power drive.
Background
Since the 90 s of the 20 th century, with the rise of the gallium nitride-based third-generation semiconductor, the blue and white light emitting diodes were successfully developed, and the solid light source LED light emitting diode with the advantages of high efficiency, energy conservation, environmental protection, long service life and the like really ignites the brilliance of green illumination, so that the solid light source LED light emitting diode is considered to be the most valuable new light source in the 21 st century. However, the electrical discreteness of the high-power LED is large, and is easily affected by temperature, and after the LED is turned on, the voltage applied to the two ends of the LED is slightly increased, which may cause the current flowing through the LED to increase sharply, and in severe cases, the LED may exceed the rated current for a long time, and the semiconductor chip of the LED may be easily burned out. To control the brightness of a high power LED, the driver must provide a constant current.
The high-power LED constant current drive commonly used comprises resistance current limiting, an open tube converter, a special chip and the like. The resistance current-limiting mode control method is simple, but the method cannot solve the problem of luminous flux output change caused by power supply voltage fluctuation, has large energy loss and low efficiency and cannot achieve the aim of energy saving. Many semiconductor manufacturers have released special driving chips for high-power LEDs, which have achieved good results, but such chips are generally expensive. Aiming at the defects of the existing driving circuit, the LED electronic element based on power driving is provided, and the circuit is simple and easy to use, the control method is simple, the efficiency is high, and the cost is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a: in order to solve the problems in the background art, the utility model provides a LED electronic component based on power drive.
The utility model discloses a realize above-mentioned purpose and specifically adopt following technical scheme:
a power-driven LED electronic component, comprising:
the LED lamps are arranged in a plurality of numbers and are connected in series in a loop through a lead to form an LED lamp string;
a PWM control circuit for detecting current and providing feedback;
and the driving circuit is compared with an output signal of an error amplifier in the PWM control chip, and the brightness of the LED can be adjusted by adjusting the duty ratio of the driving circuit, so that the aim of dimming is fulfilled.
Further, the control circuit comprises a UC3843, a MOSFET Q1, an inductor 1.1, a high-power series freewheeling diode D1, and a detection resistor R12, wherein a pin of the UC3843 is connected with a resistor capacitor R13 and a capacitor C9, which are used to determine a sawtooth wave oscillation frequency of PWM, and the duty ratio of the PWM signal is controlled by comparing the UC3843, the MOSFET Q1, the inductor 1.1, the high-power series freewheeling diode D1, the detection resistor R12, and a current detection signal through current detection, so as to limit a peak current value flowing through the LED.
Furthermore, the UC3843, the MOSFET Q1, the inductor 1.1, the high-power series freewheeling diode D1, and the detection resistor R12 are electrically connected to form a closed loop, and are connected in parallel with the resistor capacitor R13 and the capacitor C9.
Further, the slope compensation circuit further comprises a slope compensation network, wherein the slope compensation network is composed of a transistor Q4, a resistor R8, a resistor R9, a resistor R10, a resistor R12, a capacitor C5 and a capacitor C8, and the transistor Q4, the resistor R8, the resistor R9, the resistor R10, the resistor R12, the capacitor C5 and the capacitor C8 are electrically connected with each other.
Further, the capacitor C5 is an ac coupling capacitor.
Furthermore, a first-stage emitter follower is added in the oscillation signal output by the isolation pin of the capacitor C5.
The utility model has the advantages as follows:
the utility model discloses a IC chip UC3843 be that high performance fixed frequency current mode controller chip has 8 pins, and outer circuit wiring is simple, and used component is few, and the superior performance, and is with low costs, and the chip is inside to have the oscillator that can finely tune to carry out accurate duty cycle control.
Drawings
Fig. 1 is a circuit diagram of a driving circuit of the present invention;
fig. 2 is a part connection diagram of the electronic component of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention.
As shown in fig. 1-2, a power-based driven LED electronic component includes: the LED lamps are arranged in a plurality of numbers and are connected in series in a loop through a lead to form an LED lamp string; a PWM control circuit for detecting current and providing feedback; and the driving circuit is compared with an output signal of an error amplifier in the PWM control chip, and the brightness of the LED can be adjusted by adjusting the duty ratio of the driving circuit, so that the aim of dimming is fulfilled.
As shown in fig. 1, in some embodiments, the control circuit includes UC3843, MOSFET Q1, inductor 1.1, high-power series freewheeling diode D1, and detection resistor R12, a resistor capacitor R13 and a capacitor C9 are connected to a pin of the UC3843, and are used to determine a sawtooth oscillation frequency of PWM, and a duty ratio of a PWM signal is controlled by comparing the UC3843, MOSFET Q1, inductor 1.1, high-power series freewheeling diode D1, and detection resistor R12 with a current detection signal through current detection, so as to limit a peak current value flowing through the LED.
As shown in fig. 2, in some embodiments, the UC3843, the MOSFET Q1, the inductor 1.1, the high-power serial freewheeling diode D1, and the detection resistor R12 are electrically connected to form a closed loop, and are connected in parallel with the resistor-capacitor R13 and the capacitor C9.
As shown in fig. 1-2, in some embodiments, the system further includes a slope compensation network, the slope compensation network is composed of a transistor Q4, a resistor R8, a resistor R9, a resistor R10, a resistor R12, a capacitor C5, and a capacitor C8, and the transistor Q4, the resistor R8, the resistor R9, the resistor R10, the resistor R12, the capacitor C5, and the capacitor C8 are electrically connected to each other.
As shown in fig. 2, in some embodiments, the capacitor C5 is an ac coupling capacitor.
In some embodiments, as shown in fig. 1, a first emitter follower is added to the oscillation signal output from the isolation pin of the capacitor C5
The utility model discloses a theory of operation does: the circuit mainly comprises a UC3843, a MOSFET QI, an inductor LI, a high-power IED series freewheeling diode DI and a detection resistor R12, and is a BUCK type peak current control mode circuit. The resistor capacitor RI3 and the capacitor C9 connected with the pin 4 are used for determining the sawtooth wave oscillation frequency of the PWM; the voltage reference of current detection feedback consisting of error amplifiers in RI, R2, potentiometers R3,1IL.431, R4, R5, C3 and UC3843 is compared with a current detection signal through a current detection comparator to control the duty ratio of a PWM signal and limit the current peak value flowing through an LED, a designed slope compensation circuit adopts a peak-peak voltage signal on a CT (current transformer) as an input signal of slope compensation, a principle circuit comprises a transistor Q4, a resistor R8, a resistor R9, a resistor R10, a resistor R12, a capacitor C5 and a capacitor C8, the capacitor C5 is an alternating current coupling capacitor, and an isolation pin 4 outputs a direct current component in an oscillation signal. To reduce the interaction between the timing resistor RI3 and the compensation network, a first emitter follower is added between the oscillator output and the compensation network input. The resistor R8 and the resistor R10 form a voltage division network, a slope compensation signal is obtained at a pin 3 of the UC3843, and meanwhile, the resistor R10 and the capacitor C8 form a peak current absorber to filter a peak interference signal. The slope compensation signal and the current detection signal are summed at leg 3 of UC3843, so that slope compensation is achieved, and inside UC3843, the reverse input terminal of the current detection comparator is clamped at IV by a built-in zener diode, and as long as the voltage at leg 3 of the chip reaches IV, terminal 6 is turned off, so that MOS transistor Q1 is immediately turned off. The IED can thus be dimmed by changing the value of the input voltage of the control pin 3-the average current through the LEDs over a period. In FIG. 2, R14, R15, RI6, R17, Q2 and Q3 are included. In order to make human eyes not feel the flicker of the light, the frequency of the PWMD signal is taken as 100-200HZ. When the PWMD signal is low level, Q3 is conducted, the voltage added at pin 3 exceeds IV, and the output end 6 of UC3843 immediately turns off the MOS tube. When the duty ratio of the PWMD signal changes, the average current flowing through the LED in one period also changes, so that the luminous flux output by the IED also changes, and the aim of controlling the brightness of the LED is fulfilled. In practical application, the PWMD can be generated by a simple singlechip with a PWM function.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. An LED electronic component driven based on power, comprising:
the LED lamps are arranged in a plurality of numbers and are connected in series in a loop through a lead to form an LED lamp string;
a PWM control circuit for detecting current and providing feedback;
and the driving circuit is compared with an output signal of an error amplifier in the PWM control chip, and the brightness of the LED can be adjusted by adjusting the duty ratio of the driving circuit, so that the aim of dimming is fulfilled.
2. The LED electronic component based on power driving as claimed in claim 1, wherein the control circuit includes UC3843, MOSFET Q1, inductor 1.1, high power series freewheeling diode D1, and detection resistor R12, the pin of UC3843 is connected with resistor capacitor R13 and capacitor C9, which are used to determine the sawtooth oscillation frequency of PWM, and the duty ratio of PWM signal is controlled by comparing UC3843, MOSFET Q1, inductor 1.1, high power series freewheeling diode D1, detection resistor R12 with the current detection signal through current detection, so as to limit the peak value of current flowing through the LED.
3. The power-driving-based LED electronic component of claim 1, wherein the UC3843, the MOSFET Q1, the inductor 1.1, the high-power series freewheeling diode D1, and the detection resistor R12 are electrically connected to form a closed loop, and are connected in parallel with the resistor-capacitor R13 and the capacitor C9.
4. The power-drive-based LED electronic component according to claim 1, further comprising a slope compensation network, wherein the slope compensation network is composed of a transistor Q4, a resistor R8, a resistor R9, a resistor R10, a resistor R12, a capacitor C5 and a capacitor C8, and the transistor Q4, the resistor R8, the resistor R9, the resistor R10, the resistor R12, the capacitor C5 and the capacitor C8 are electrically connected to each other.
5. The power-driving-based LED electronic component of claim 1, wherein the capacitor C5 is an ac coupling capacitor.
6. The power-drive-based LED electronic component as claimed in claim 1, wherein a first emitter follower is added to the isolated pin output oscillating signal of the capacitor C5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221232407.3U CN217770421U (en) | 2022-05-20 | 2022-05-20 | LED electronic component based on power driving |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221232407.3U CN217770421U (en) | 2022-05-20 | 2022-05-20 | LED electronic component based on power driving |
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| CN217770421U true CN217770421U (en) | 2022-11-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119421288A (en) * | 2025-01-06 | 2025-02-11 | 珠海市圣昌电子有限公司 | A multi-mode dimming and color adjustment power supply based on PWM |
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2022
- 2022-05-20 CN CN202221232407.3U patent/CN217770421U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119421288A (en) * | 2025-01-06 | 2025-02-11 | 珠海市圣昌电子有限公司 | A multi-mode dimming and color adjustment power supply based on PWM |
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