CN201672427U - Led illuminating device - Google Patents

Abstract

The utility model discloses an LED illuminating device comprising a direct-current charging circuit, a power storage loop, an LED drive circuit, and an LED array formed by a plurality of LEDs, which are connected in sequence. The power storage loop comprises a capacitor bank and a photocell circuit which are connected between the direct-current charging circuit and the LED drive circuit; the photocell circuit and the capacitor bank are connected in parallel and then grounded by a first resistor; and the photocell circuit comprises a photocell, an illuminating switch and a second resistor which are sequentially connected in series. In the utility model, the LED illuminating device adopts the capacitor bank to conduct power storage, works at a frequency of 50 Hz or 60 Hz, has small loss, is energy-saving and environment-friendly, and has light weight; in addition, when in emergency, the photocell can be used for absorbing solar energy to supplement energy, thus avoiding the phenomenon that the LED array has unstable voltage caused by unstable voltage of the charging circuit, and further leading to stable illumination of the LED array.

Description

LED lighting

technical field

The utility model relates to a lighting device, in particular to an LED lighting device.

Background technique

At present, LEDs have advantages over traditional lighting sources, such as lower power requirements, faster response speed, higher shock resistance, longer service life, green environmental protection, and continuously and rapidly increasing luminous efficiency. etc., becoming a new generation of light source that is most likely to replace traditional light sources in the world.

Most of the current LED lighting devices use dry batteries, but the extensive use of dry batteries has brought great harm to the environment. Because dry batteries use a certain amount of mercury in the manufacturing process, mercury is a harmful cumulative poisoning substance to the human body, and it is very easy to pollute the environment, especially water quality, causing various hazards. According to statistics, my country produces 5 billion dry batteries each year, including 100 million zinc-mercury batteries and alkaline batteries, and 100 tons of mercury per year. Because people use up the batteries and throw them away at will, over time, they will be exposed to the sun and rain or buried in the ground, which will often pollute the environment. It has become an inevitable trend to replace traditional dry batteries with environmentally friendly and energy-saving components. Therefore, a rechargeable LED lighting device that can be reused has emerged as the times require.

Most of the existing LED lighting devices use lithium batteries and nickel batteries to store electric energy. However, such devices are often heavy and not easy to carry, and their charging and discharging voltage instability can easily lead to unstable LED lighting. In addition, lithium and nickel batteries have a very limited lifespan, shortening the lifespan of LED lighting fixtures. Therefore, it is urgent to provide an improved LED lighting device to overcome the above defects.

Utility model content

The technical problem to be solved by the utility model is to provide an LED lighting device which is energy-saving, environment-friendly, portable, stable in light emission and long in service life.

In order to solve the above technical problems, the utility model provides an LED lighting device, which includes a DC charging circuit, a power storage circuit, an LED driving circuit and an LED array composed of several LEDs connected in sequence. The storage circuit includes a capacitor bank and a photocell circuit connected between the DC charging circuit and the LED driving circuit, and the photocell circuit is connected in parallel with the capacitor bank and grounded through a first resistor. The photocell circuit includes a photocell, a lighting switch and a second resistor connected in series in sequence.

Compared with the prior art, because the utility model adopts the capacitor bank to store electricity, since the utility model works at 50 or 60 Hz, the loss is small, the utility model is energy-saving, environment-friendly and light in weight. In addition, in case of emergency, solar cells can be used to absorb solar energy to supplement energy, avoiding voltage instability of the LED array caused by voltage instability of the charging circuit, thereby enabling the LED array to emit light stably.

As a preferred embodiment of the present invention, the LED driving circuit includes an astable oscillator, a switching transistor and an inductor, the input end of the astable oscillator is connected to the storage circuit, and the output end is connected to the switch The control end of the transistor is connected, the high potential end of the controlled end of the switching transistor is connected to the storage circuit, the low potential end is connected to one end of the inductor, and the other end of the inductor is respectively connected to the LED array and the ground. . The aforementioned LED driving circuit can provide a stable voltage for the LED array to ensure stable light emission at low voltage.

Preferably, the switch transistor is a PNP transistor with high DC gain and low collector-emitter saturation voltage to obtain the best efficiency.

Preferably, the photovoltaic cell circuit further includes an isolation diode, the anode of the isolation diode is connected to the photovoltaic cell, and the cathode of the isolation diode is connected to the DC charging circuit. The isolation diode can avoid mutual interference between the DC charging circuit and the photocell.

Preferably, the capacitor bank includes a plurality of 1F capacitors. Large size, good heat dissipation.

Preferably, the DC charging circuit includes a current-limiting step-down circuit, a diode rectifier circuit, and a filter circuit that are sequentially connected to the mains network. In this way, the charging current is small and the charging time is long, which improves the service life of the capacitor bank.

The utility model will become clearer through the following description in conjunction with the accompanying drawings, which are used to explain the embodiments of the utility model.

Description of drawings

Fig. 1 is a functional block diagram of the LED lighting device of the present invention.

FIG. 2 is a detailed circuit diagram of the power storage circuit of the LED lighting device shown in FIG. 1 .

FIG. 3 is a detailed circuit diagram of the LED driving circuit and the LED array of the LED lighting device shown in FIG. 1 .

FIG. 4 is a detailed circuit diagram of the DC charging circuit of the LED lighting device shown in FIG. 1 .

Detailed ways

Embodiments of the present invention will now be described with reference to the drawings, in which like reference numerals represent like elements. As mentioned above, the utility model provides an energy-saving, environment-friendly, portable and highly stable LED lighting device.

The technical solutions of the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. As shown in FIG. 1 , the LED lighting device of this embodiment includes a DC charging circuit 1 , a power storage circuit 2 , an LED driving circuit 3 , and an LED array 4 composed of several LEDs connected in sequence.

As shown in Figure 2, the storage circuit 2 includes a capacitor bank 21 and a photocell circuit 22 connected between the DC charging circuit 1 and the LED drive circuit 3, and the photocell circuit 22 and the capacitor bank 21 After being connected in parallel, they are grounded through the first resistor Rd. The photocell circuit 22 includes a photocell 22a, a lighting switch S2 and a second resistor Rc connected in series in sequence. As shown in the figure, the photovoltaic cell circuit 22 may further include an isolation diode D2, the anode of the isolation diode D2 is connected to the photovoltaic cell 22a, and the cathode is connected to the DC charging circuit 1 . The isolation diode D2 can prevent the DC charging circuit 1 from interfering with the photovoltaic cell 22a. Because the utility model adopts the capacitor bank 21 to store electricity, since it works at 50 or 60 Hz, the loss is small, energy saving, environmental protection and light in weight.

Under normal circumstances, the capacitor bank 21 is charged through the DC charging circuit 1, and in an emergency, the photovoltaic cell 22a can be used to absorb solar energy to replenish energy, avoiding the voltage instability of the LED array caused by the unstable voltage of the charging circuit, so that the LED array emits light stably .

Preferably, the capacitor bank includes a plurality of 1F capacitors. Large size, good heat dissipation.

As shown in FIG. 3 , the LED driving circuit 3 of this embodiment includes an astable oscillator 31 , a switching transistor 32 and an inductor L1 . The astable oscillator 31 is composed of triodes Q1, Q2 and their peripheral circuits and their peripheral circuits R1-R6, C1-C2. The input end of the astable oscillator 31 is connected to the storage circuit 2, The output end is connected to the control end of the switching transistor 32, the high potential end of the controlled end of the switching transistor 32 is connected to the storage circuit 2, and the low potential end is connected to one end of the inductor L1, the inductor L1 The other ends of the LED arrays 4 and ground are respectively connected. The foregoing LED driving circuit 3 can provide a stable voltage for the LED array 4 to ensure stable light emission at low voltage.

Specifically, in this embodiment, the switching transistor 32 may be a PNP transistor Q3, the base of the PNP transistor Q3 is connected to the collector of Q2, the emitter is connected to the power storage circuit 2, and the collector is passed through the inductor L1 grounded. The PNP transistor Q3 has high DC gain and low collector-emitter saturation voltage, so that the best efficiency can be obtained.

As shown in FIG. 4 , the DC charging circuit 1 includes a current-limiting step-down circuit 11 , a diode rectifier circuit 12 and a filter circuit 13 sequentially connected to the mains network. In this way, the charging current is small and the charging time is long, which improves the service life of the capacitor bank 21 . Optionally, a light-emitting diode VD3 is connected in series between the filter circuit 13 and the diode rectifier circuit 12 to indicate whether the LED device is in a charging state.

When the lighting switch S2 is closed, the photocell charges the capacitor bank, and sends a high-level signal to the LED drive circuit through the capacitor bank, so that the astable oscillator composed of transistors Q1 and Q2 starts to oscillate, and the transistor Q2 The collector outputs a square wave to control the on-off of the switching transistor Q3. When the switching transistor Q3 is turned on, the inductor L1 is charged. When the switching transistor Q3 is turned off, the inductor L1 releases the stored energy through the direction of the LED array, thereby lighting the LED. The LED driving circuit has a simple structure and is driven at a low voltage, thereby ensuring stable light emission of the LED array. It should be noted that the charging rate of the inductor L1 is greater than the discharging rate, and the aforementioned current-limiting step-down circuit 11 , diode rectifier circuit 12 and filter circuit 13 are well known to those skilled in the art, and will not be repeated here.

Claims (7)

1. An LED lighting device, comprising a DC charging circuit, an electric storage circuit, an LED drive circuit and an LED array composed of several LEDs connected in sequence, it is characterized in that: the electric storage circuit includes a circuit connected to the DC charging circuit A capacitor bank and a photocell circuit between the LED driving circuit, the photocell circuit is connected in parallel with the capacitor bank and grounded through a first resistor, and the photocell circuit includes a photocell, a lighting switch and a second resistor connected in series in sequence. 2. The LED lighting device according to claim 1, characterized in that: the LED driving circuit comprises an astable oscillator, a switching transistor and an inductor, and the input end of the astable oscillator is connected to the power storage circuit connection, the output end is connected to the control end of the switching transistor, the high potential end of the controlled end of the switching transistor is connected to the storage circuit, the low potential end is connected to one end of the inductor, and the other end of the inductor Connect the LED array and ground respectively. 3. The LED lighting device according to claim 2, wherein the switch transistor is a PNP transistor. 4. The LED lighting device according to claim 3, wherein the photocell circuit further includes an isolation diode, the anode of the isolation diode is connected to the photocell, and the cathode of the isolation diode is connected to the DC charging circuit. connected. 5. The LED lighting device according to any one of claims 1-4, wherein the capacitor bank comprises a plurality of 1F capacitors. 6. The LED lighting device according to any one of claims 1-4, wherein the DC charging circuit comprises a current-limiting step-down circuit, a diode rectifier circuit and a filter circuit sequentially connected to the mains network. 7. The LED lighting device according to claim 6, wherein a light emitting diode is connected in series between the filter circuit and the diode rectifier circuit.

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