LED lighting device driven by boosting alternating current

The present invention relates to an LED lighting device driven by boosting alternating current, and more particularly to an LED lighting device that is boosted by an AC boosting driving circuit. Under the premise that the same luminous efficiency is achieved by an LED lighting load, the required operating current is lowered to reduce the heat generated by the LED lighting load.

With the development of science and technology, new products and technologies are constantly innovating. LEDs as new light sources have the characteristics of energy saving, environment-friendly and high efficiency. The LED technology has matured and is applied to various fields. Therefore, LEDs are widely used. In order to ensure that the LED load can be driven by the mains electricity, the industry produces LED products with an operating voltage in the peak voltage of the mains electricity, that is, in the range of 1.414 times the effective value of the mains electricity. Since the electric power is equal to the current multiplied by the voltage (W=V*I), if the voltage is limited and the luminous efficiency of the LED load is to be increased, only the amount of the LED load can be increased, or the current passing through the LED load can be increased. However, increasing the amount of LED load will increase the cost, and the increase in current will increase the heat generated by the LED load greatly, and the operating temperature is also increased greatly. Therefore, the service life of the LED load is shortened.

The primary object of the present invention is to provide an LED lighting device driven by boosting alternating current. Under the premise of the same luminous efficiency, the operating current required for an LED load is lowered to reduce the heat generated by the LED load.

An LED lighting device driven by boosting alternating current comprises a mains AC input terminal, an LED lighting load, and an AC boosting driving circuit. The mains AC input terminal is configured to input mains electricity. An operating voltage of the LED lighting load is 1.5 times to 6 times an effective voltage of the mains electricity. The AC boosting driving circuit is electrically connected the mains AC input terminal and the LED lighting load, and is configured to perform forward boosting and reverse boosting for the mains electricity from the mains AC input terminal so that the voltage of the mains electricity is boosted to 1.5 to 6 times to be supplied to the LED lighting load.

Preferably, the AC boosting driving circuit includes a forward boosting module and a reverse boosting module. A positive half cycle of the mains electricity is boosted by the forward boosting module, and a negative half cycle of the mains electricity is boosted by the reverse boosting module.

Preferably, the LED lighting device driven by boosting alternating current further comprises a capacitor array. A positive electrode of the capacitor array is electrically connected to an output terminal of the forward boosting module and a positive electrode of the LED lighting load. A negative electrode of the capacitor array is electrically connected to an output terminal of the reverse boosting module.

Preferably, the LED lighting device driven by boosting alternating current further comprises a constant current driver. The constant current driver is electrically connected to the LED lighting load so that a current passing through the LED lighting load is a constant value.

Preferably, the forward boosting module is a first diode.

Preferably, the reverse boosting module is a second diode.

Preferably, the capacitor array includes a first capacitor and a second capacitor. The first capacitor is electrically connected to the forward boosting module and the LED lighting load. The second capacitor is electrically connected to the reverse boosting module.

The reason for the voltage of the mains electricity to be boosted to 1.5 times to 6 times: the conventional circuit without the AC boost driving circuit is taken as an example, because the mains electricity is alternating current, the operating voltage of the LED lighting load using direct current will be less than the peak value of the voltage of the mains electricity, that is, 1.414 times the voltage of the mains electricity. Even if the voltage is unstable to result in that the voltage of the mains electricity is suddenly increased, the LED lighting load with an operating voltage that is 1.5 times or more the voltage of the mains electricity cannot be driven, so as to achieve the effect of 1.5 times of the present invention. The voltage resistance of most existing electronic components is less than 800V. When it is more than 800V, it is difficult for the electronic components to load, and expensive semiconductor materials are needed. This is less economical. When the mains electricity is 120V, 800V is equivalent to more than six times the mains electricity. Therefore, the voltage of the mains electricity is boosted to 1.5 times to 6 times, meeting different usage requirements.

According to the above technical features, the following effects can be achieved:

1. Through a simple component, such as the AC boosting driving circuit to boost the received mains electricity, the effective voltage of the mains electricity is boosted to 1.5 times to 6 times, so as to meet different usage requirements.

2. Because of the increase of the voltage across the LED lighting load, the LED lighting load achieves the same luminous efficiency, and the current flowing through the LED lighting load can be reduced, thereby reducing the heat generated by the LED lighting load. The operating temperature of the LED lighting load is reduced. The service life is prolonged. The power saving, energy saving, carbon reduction, and luminous efficiency are improved.

3. The residual voltage in the first capacitor and the second capacitor is discharged by the first resistor and the second resistor, thereby avoiding a danger caused by the residual voltage. In addition, it is also avoided that the residual voltage causes the overvoltage of the first capacitor or the second capacitor in the next use, thereby improving safety.

4. The constant current driver is configured to keep the brightness of the LED lighting load constant, so as to prevent the LED lighting load from flashing due to unstable current.

FIG. 1 is a circuit diagram of an embodiment of the present invention, illustrating an LED lighting device driven by boosting alternating current of the present invention;

FIG. 2 is a schematic view of the embodiment of the present invention, illustrating that the LED lighting load of this embodiment is a light bulb;

FIG. 3 is a diagram illustrating the relationship between the voltage and time of the mains electricity of the embodiment of the present invention;

FIG. 4 is a diagram illustrating the relationship between the forward current and forward voltage of the LED lighting load of the embodiment of the present invention; and

FIG. 5 is a diagram illustrating the relationship between the forward luminous flux and forward current of the LED lighting load of the embodiment of the present invention.

Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings.

Referring to FIG. 1 , an LED lighting device driven by boosting alternating current comprises mains AC input terminals L 1 , L 2 , an AC boosting driving circuit, a capacitor array, an LED lighting load D 3 , and a constant current driver U 1 .

The mains AC input terminals L 1 , L 2 are configured to input mains electricity.

The AC boosting driving circuit includes a forward boosting module and a reverse boosting module. In this embodiment of the present invention, the forward boosting module is a first diode D 1 , and the reverse boosting module is a second diode D 2 . The input terminal of the forward boost module, namely the anode of the first diode D 1 , is electrically connected to one of the mains AC input terminals L 1 , L 2 . The output terminal of the reverse boosting module, namely the cathode of the second diode D 2 , is electrically connected to the same mains AC input terminal L 1 , L 2 .

The capacitor array includes a first capacitor C 1 and a second capacitor C 2 . The positive electrode of the first capacitor C 1 is electrically connected to the cathode of the first diode D 1 . The negative electrode of the second capacitor C 2 is electrically connected to the anode of the second diode D 2 and connected to the ground.

One end of a first resistor R 1 is electrically connected to the positive electrode of the first capacitor C 1 . The other end of the first resistor R 1 is electrically connected to one end of a second resistor R 2 . The other end of the second resistor R 2 is electrically connected to the negative electrode of the second capacitor C 2 .

The anode of the LED lighting load D 3 is electrically connected to the cathode of the first diode D 1 .

The constant current driver U 1 is configured to keep the brightness of the LED lighting load D 3 constant, so as to prevent the LED lighting load D 3 from flashing due to unstable current. The constant current driver U 1 includes an input voltage pin VC. The input voltage pin VC is electrically connected to the negative electrode of the LED lighting load D 3 . The constant current driver U 1 is commonly used in the art, and no further details are described hereinafter for concision.

Through the simple components such as the first diode D 1 and the second diode D 2 , the effective voltage of the mains electricity is boosted to 1.5 times to 6 times and then supplied to the LED lighting load D 3 , so that the voltage across the LED lighting load D 3 rises. The operating voltage of the LED lighting load D 3 is 1.5 times to 6 times the effective voltage of the mains electricity. Because of the increase of the voltage across the LED lighting load D 3 , the LED lighting load D 3 achieves the same luminous efficiency, and the current flowing through the LED lighting load D 3 is reduced, thereby reducing the heat generated by the LED lighting load D 3 . The operating temperature of the LED lighting load D 3 is reduced. The service life is prolonged. The power saving, energy saving, carbon reduction, and luminous efficiency are improved.

Referring to FIG. 1 and FIG. 2 , in this embodiment of the present invention, the LED lighting load D 3 is a light bulb. The light bulb includes a circuit D 31 , a light bulb holder D 32 , a light bulb shell D 33 , and a lighting source D 34 . The AC boosting driving circuit may be directly disposed in the light bulb holder D 32 as the circuit D 31 , or the AC boosting driving circuit and the circuit D 31 are connected by wires outside the light bulb D 3 . It should be noted that the light bulb D 3 is taken as an example only, and the AC boosting driving circuit is not limited to be applied to the light bulb D 3 . The AC boosting driving circuit may be used in any LED lighting device.

FIG. 1 and FIG. 3 illustrate the flow and storage of the mains electricity from the mains AC input terminals L 1 , L 2 . When the mains electricity is in a positive half cycle, the mains electricity is boosted forward by the first diode D 1 , and the first capacitor C 1 is charged. Since the voltage of the first capacitor C 1 is less than the voltage of the LED lighting load D 3 , the mains electricity is stored in the first capacitor C 1 . When the mains electricity in a negative half cycle, that is, when the voltage of the mains electricity is less than 0, the mains electricity is boosted reversely by the second diode D 2 , and the second capacitor C 2 is charged. Since sum of the voltage of the second capacitor C 2 and the voltage of the first capacitor C 1 equal to the voltage of the LED lighting load D 3 , the current of the mains electricity flows through the LED lighting load D 3 so that the LED lighting load D 3 emits light. At the same time, the first resistor R 1 and the second resistor R 2 performs filtering, and the constant current driver U 1 performs constant current control, so that the current flowing through the LED lighting load D 3 is a constant value.

After the input of the mains electricity is stopped, the residual voltage in the first capacitor C 1 and the second capacitor C 2 is discharged by the first resistor R 1 and the second resistor R 2 , thereby avoiding a danger caused by the residual voltage. In addition, it is also avoided that the residual voltage causes the overvoltage of the first capacitor C 1 or the second capacitor C 2 in the next use, thereby improving safety.

Referring to FIG. 1 and FIG. 4 , the LED lighting load D 3 that is commercially available is taken as an example. If the LED lighting load D 3 is marked as 8 W, the product of the operating current of the LED lighting load D 3 and the input voltage is 8 W. Hereinafter, the LED lighting loads D 3 of the same size and the same 8 W are divided into a control group A 1 that is not boosted and a test group A 2 that is boosted. The experimental group A 2 is the present invention. If the voltage of the mains electricity input to the mains AC input terminals L 1 , L 2 is 132V, the operating current of the control group A 1 is that 8 W divided by 132V approximately equals 60 mA. After the voltage boosted by the first diode D 1 and the second diode D 2 is raised to 276V, the operating current of the experimental group A 2 is that 8 W divided by 276V approximately equals 28 mA. FIG. 4 illustrates the relationship between the forward current and forward voltage of the LED lighting load D 3 . When the control group A 1 is operated at 60 mA, the operating voltage of the control group A 1 is about 2.88V, and the electric power of the actual operation of the control group A 1 is that 60 mA multiplied by 2.88V is 0.1728 W. When the experimental group A 2 is operated at 28 mA, the operating voltage of the experimental group A 2 is about 2.77V, and the electric power of the actual operation of the experimental group A 2 is that 28 mA multiplied by 2.77V is 0.07756 W.

Please refer to FIG. 1 and FIG. 5 . FIG. 5 shows the relationship between the forward luminous flux and the forward current of the LED lighting load D 3 . When the control group A 1 is operated at 60 mA, the forward luminous flux of the control group A 1 is about 41%, and the luminous efficiency of the control group A 1 is that 41% divided by 0.1728 W approximately equals 237.26 W −1 . When the experimental group A 2 is operated at 28 mA, the forward luminous flux of the experimental group A 2 is about 20%, and the luminous efficiency of the experimental group A 2 is that 20% divided by 0.07756 W approximately equals 257.86 W −1 . It should be noted that the forward luminous flux of the vertical axis in FIG. 5 is the maximum luminous flux relative to the LED lighting load D 3 . Since the control group A 1 and the experimental group A 2 use the LED lighting loads D 3 having the same maximum luminous flux, only the forward luminous flux is calculated. From the above calculations, it can be known that the luminous efficiency of the experimental group A 2 is indeed higher than that of the control group A 1 after the operating voltage is raised and the operating current is lowered.

Based on the foregoing calculation, in the case that the LED lighting load D 3 of the same size is used, according to the characteristics of the voltage and current of the LED lighting load D 3 , when the voltage the LED lighting load D 3 is raised and the current is lowered, the luminous efficiency can be improved. Alternatively, by connecting the same number of LED lighting loads D 3 in series, the same power, lower heat generation and increased luminous efficiency can be achieved. Therefore, the manufacturer can manufacture the LED lighting load D 3 with a high wattage for the luminous efficiency of the LED lighting load D 3 to be better, but the current flowing through the LED lighting load D 3 is not increased, thereby achieving the energy saving effect.

Although particular embodiments of the present invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the present invention. Accordingly, the present invention is not to be limited except as by the appended claims.