TWI700962B - Lighting device - Google Patents

Abstract

The lighting device of the invention comprises: a stability resistor and a stability diode, which constitutes an application circuiy with a disdetermined DC power supply powered by a light-emitting diode to drive a control integrated circuit, and achieves the effect of light-emitting diode group light-emitting stability in order to replace the AC power filter effect of X-capacitor.

Description

Lighting device

The lighting device of the present invention uses a stable resistor and a stable diode in the application circuit of a non-isolated LED lighting drive integrated circuit to replace the field of AC X capacitor power filtering.

Background technique

As shown in Figure 1, it is the application circuit of the conventional non-isolated LED lighting drive integrated circuit. As can be seen from the figure, the SD6922STR non-isolated LED lighting drive integrated circuit of Silan Microelectronics is used as an example. Its peripheral application Floating BUCK architecture, built-in 600V high-voltage power MOSFET, the chip uses the inductive current of the second inductor L2 to flow into the second pin CS polarity conversion circuit of the driving integrated circuit, and uses the internal error amplifier to form a closed-circuit feedback network to achieve high Constant current accuracy and high input and output adjustment rate. At the same time, the chip has its own PFC control, which automatically achieves a high PF value in the full voltage range. The critical conduction mode of the chip can reduce switching energy dissipation and improve system conversion efficiency. Figure 1 is conventional The operating principle of the application circuit will not be repeated.

As shown in Figure 2, it is the waveform diagram measured at the measurement point with the X capacitor 10 removed in Figure 1. It can be seen from the figure that there are many ripples at both ends of the LED group 100, and the reason is X capacitor 10 go After removal, it loses the filtering function of the AC power source, so there are many ripples at both ends of the LED group 100, especially when the AC power switch uses a neon lamp as the indicator light, the ripple at both ends of the LED group 100 More, causing the light-emitting diode group 100 to flicker and affect the vision.

As shown in Fig. 3, it is the waveform of the X capacitor 10 in Fig. 1 measured at the measurement point. It can be seen from the figure that only points A and B appear at the ripple points at the two ends of the LED group 100. The reason for point and point C is that the X capacitor 10 is connected to filter the AC power, so the flicker at both ends of the LED group 100 is greatly improved.

The model of the instrument measured by the present invention is a DPO4034 oscilloscope from Tektronix. The measured waveforms and data of the measurement points are within the error tolerance of the instrument. The waveform data is for reference only, and the most important factor is the waveform ripple. Comparison to prove that the present invention can be implemented.

In the field of lighting technology, the optimization of short, small, lightweight products often cannot fit the standardized AC X capacitors on dense circuit boards. The disadvantages are as follows:

1. The standardized AC X capacitors are large in size and are not suitable for the needs of short, light and thin optimized products.

2. The high price of standardized AC X capacitors increases production costs.

The purpose of the present invention:

1. The present invention uses a stable resistor and a stable diode to make the non-isolated LED lighting drive integrated circuit obtain a stable DC power supply, achieving the effect of stabilizing the light of the light emitting diode group, instead of the AC X capacitor.

2. The stable resistor and the stable diode used in the present invention have small size and low price, and are suitable for short, light and thin lighting product applications.

The invention has the following characteristics:

1. The stabilizing resistor of the present invention allows the full-wave rectifier DC positive output terminal and DC negative terminal to obtain a complete DC power supply circuit, so that the non-isolated LED lighting drive integrated circuit is supplied with a stable DC power supply, achieving the second light emission. The polar body group has a stable luminous effect.

2. The function of the stable diode of the present invention is to prevent the power supply system at both ends of the LED group from feeding back to the complete DC power supply circuit of the full-wave rectifier DC positive output terminal and DC negative terminal, but to reach the LED group Stable luminescence effect.

IC1: Non-isolated LED lighting driver integrated circuit

L1: first inductor

L2: second inductor

R1: first resistor

R2: second resistor

R3: third resistor

R4: Fourth resistor

R5: fifth resistor

R6: sixth resistor

R7: seventh resistor

R8‧‧‧Eighth resistor

C2‧‧‧Second capacitor

C3‧‧‧The third capacitor

C4‧‧‧Fourth capacitor

C5‧‧‧Fifth capacitor

C6‧‧‧The sixth capacitor

V1‧‧‧Surge Absorber

D1‧‧‧First Semiconductor

D2‧‧‧Second Semiconductor

10‧‧‧X capacitor

20‧‧‧Holding diode

30‧‧‧Holding resistor

100‧‧‧Light Emitting Diode Group

BD1‧‧‧Full-wave rectifier

F1‧‧‧Fuse

L‧‧‧AC power live wire

N‧‧‧AC power neutral line

S‧‧‧switch

LED+‧‧‧Light-emitting diode group positive terminal

LED-‧‧‧Light-Emitting Diode Group Negative Terminal

Figure 1 shows the application circuit of the conventional non-isolated LED lighting drive integrated circuit.

Fig. 2 is a waveform diagram obtained by removing the X capacitor at the measuring point in Fig. 1.

Fig. 3 is a waveform diagram measured at the measuring point with an X capacitor connected in Fig. 1.

Figure 4 is an embodiment of the lighting device of the present invention.

Fig. 5 is a waveform diagram measured by the lighting device of the present invention at a measuring point.

As shown in Figure 4, it is an embodiment of the lighting device of the present invention. It can be seen from the figure that the AC power line L is connected to the switch S, the switch S is connected to the AC end AC of the full-wave rectifier BD1, and the AC power neutral line N is connected to the full-wave rectifier BD1 When the switch S is turned on (On), the current at the DC positive terminal V+ of the full-wave rectifier BD1 passes through the positive terminal of the first inductor L1, the second capacitor C2 and the surge absorber V1 One end, the non-isolated type is connected to one end of the surge absorber V1 The fifth and sixth pins of the LED lighting drive integrated circuit IC1 are the drain of the built-in MOSFET, the positive terminal of the third capacitor C3 and one end of the first resistor R1. At the same time, the current flows through the first resistor R1 , The second resistor R2 and the stable resistor 30 return to the DC negative terminal V- of the full-wave rectifier BD1 to form a complete stable DC power supply circuit.

At the same time, the DC current is supplied to the first pin of the non-isolated LED lighting drive integrated circuit IC1 through the stable diode 20 to the positive terminal of the fifth capacitor C5, which is the positive power supply of the non-isolated LED lighting drive integrated circuit IC1 Pin, its fifth capacitor C5 has a filtering effect, so that the non-isolated LED lighting drive integrated circuit IC1 gets stable DC power supply, and the stable diode 20 can block all the noise on the side of the light-emitting diode group 100 Interference non-isolated LED lighting drive integrated circuit IC1, it can be seen that the non-isolated LED lighting drive integrated circuit IC1 gets a stable DC power supply, and at the same time, the light-emitting diode group 100 gets a stable DC power supply to eliminate The flicker shortcomings of the LED group 100.

As shown in Figure 5, it is a waveform diagram measured by the lighting device of the present invention at the measurement point. It can be seen from the figure that only D and E points appear at the ripple points at the two ends of the LED group 100. The reason is The stabilizing resistor 30 and stabilizing diode 20 of the present invention have the function of stabilizing the power supply at both ends of the light emitting diode group 100.

From the waveforms measured at the measurement points in Figures 3 and 5, it can be seen that in Figure 3 there are points A, B, and C at the ripple points at both ends of the LED group 100, and in Figure 5 in the LED group The ripple points at both ends of 100 only appear at point D and point E. Comparison of the two shows that the present invention is superior to the stable effect of the X capacitor 10, which also proves that the present invention can replace the X capacitor 10.

In the present invention, the X capacitor 10 is replaced by a stable resistor 30 and a stable diode 20 on the same lighting circuit. The present invention can be called a pioneering. It has been achieved that the invention has unpredictable effects; of course, the stable resistor 30, the stable diode 20 and the X capacitor 10 of the present invention can be installed on the same lighting circuit at the same time, and the stable of the light-emitting diode group 100 The effect is better.

The inventor has been engaged in electronic technology research for many years. The embodiments of the present invention have been proved to be successful through experiments and implementations, and can be implemented according to them. The above embodiments are only to fully illustrate the preferred implementation of the present invention. For example, the protection scope of the present invention is not limited to this, including those skilled in the art, equivalent substitutions or changes made on the basis of the present invention, are all within the protection scope of the present invention. The scope of protection of the present invention is subject to the scope of the patent application.

IC1‧‧‧Non-isolated LED lighting driver integrated circuit

The application circuit of this non-isolated LED lighting drive integrated circuit includes:

L1‧‧‧First inductor

L2‧‧‧Second inductor

R1‧‧‧First resistor

R2‧‧‧Second resistor

R3‧‧‧Third resistor

R4‧‧‧Fourth resistor

R5‧‧‧Fifth resistor

R6‧‧‧Sixth resistor

R7‧‧‧Seventh resistor

R8‧‧‧Eighth resistor

C2‧‧‧Second capacitor

C3‧‧‧The third capacitor

C4‧‧‧Fourth capacitor

C5‧‧‧Fifth capacitor

C6‧‧‧The sixth capacitor

V1‧‧‧Surge Absorber

D1‧‧‧First Semiconductor

D2‧‧‧Second Semiconductor

20‧‧‧Holding diode

30‧‧‧Holding resistor

100‧‧‧Light Emitting Diode Group

BD1‧‧‧Full-wave rectifier

F1‧‧‧Fuse

L‧‧‧AC power live wire

N‧‧‧AC power neutral line

S‧‧‧switch

LED+‧‧‧Light-emitting diode group positive terminal

LED-‧‧‧Light-Emitting Diode Group Negative Terminal

Claims (3)

A lighting device, which is applied to the application circuit of a non-isolated LED lighting drive integrated circuit, and its function is to replace the X capacitor. The lighting device includes: a stable resistor with two ends, one end of which is connected to the non-isolated LED lighting The other end of the second resistor on the positive terminal side of the full-wave rectifier of the application circuit of the driving integrated circuit, and the other end is connected to the negative terminal of the full-wave rectifier of the application circuit of the non-isolated LED lighting driving integrated circuit; and A diode having an anode terminal and a cathode terminal, the anode terminal is connected to one end of the stable resistor, and the cathode terminal is connected to the positive power supply pin of the non-isolated LED lighting drive integrated circuit and the non-isolated LED lighting drive integrated circuit The positive terminal of the fifth capacitor of the application circuit of the circuit. According to the lighting device described in item 1 of the scope of patent application, the stable resistor, the stable diode and the X capacitor can be installed in the same application circuit of the non-isolated LED lighting drive integrated circuit. The lighting device according to item 1 of the scope of patent application, wherein the application circuit of the non-isolated LED lighting drive integrated circuit includes at least: one non-isolated LED lighting drive integrated circuit; one full-wave rectifier; one light-emitting two Polar body group; a surge absorber; and electronic passive components needed to match the light-emitting diode group to emit light.

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