CN203872383U - Discharging circuit of solar LED lighting device - Google Patents

Abstract

The utility model discloses a discharge circuit of a solar LED lighting device, which comprises: a power field effect tube, the drain is connected to a driving circuit, the source is grounded, and a resistor is connected between the grid and the source of the power field effect tube; Zener diode, the anode is connected to the source of the power FET, the cathode is connected to the grid of the power FET; an optocoupler, the output end is connected to the grid of the power FET, the ground terminal is connected to the ground through a capacitor, and the anode is connected to the grid through a The resistor is connected to a power supply, the Vcc terminal is connected to the positive pole of the storage battery; a triode, the emitter is grounded, the collector is connected to the negative pole of the optocoupler, and the base receives a discharge control signal through an adjustable resistor and grounded through a resistor.

Description

A discharge circuit of a solar LED lighting device

technical field

The utility model relates to the field of control circuits of solar lighting devices, in particular to a discharge circuit of solar LEDs.

Background technique

With the rapid development of science and technology and the increasingly serious world energy crisis, the price of oil continues to rise, and the use of conventional energy can no longer meet the needs of the rapid growth of the world economy. The development and utilization of new energy, especially solar energy, has increasingly attracted the attention of various governments. Pay attention to. With the rise of third-generation semiconductors represented by gallium nitride and the successful development of white LEDs, white LEDs are considered to be the most valuable new light source in the 21st century. White LED lighting has replaced traditional lighting and become the main way of human lighting. As a solar LED lighting device that combines the advantages of both solar energy and LEDs, it will have great practicability.

The structure of the more common solar LED lighting devices mainly includes solar panels, batteries, and driving circuits (used to drive LEDs). The performance of the storage battery will directly affect the quality of the solar LED lighting device. Therefore, how to improve its reliability and reduce the cost is a technical problem that needs to be solved at present.

Utility model content

The utility model provides a discharge circuit of a solar LED lighting device aiming at the above-mentioned deficiencies in the prior art. The utility model is realized through the following technical solutions:

A discharge circuit of a solar LED lighting device is connected between a storage battery and a driving circuit of a solar LED lighting device, and the discharging circuit of the solar LED lighting device includes:

A power field effect transistor, the drain is connected to the driving circuit, the source is grounded, and a resistor is connected between the gate and the source of the power field effect transistor;

A Zener diode, the anode of which is connected to the source of the power field effect transistor, and the cathode of which is connected to the gate of the power field effect transistor;

An optocoupler, the output terminal is connected to the gate of the power FET, the ground terminal is grounded through a capacitor, the positive pole is connected to a power supply through a resistor, and the Vcc terminal is connected to the positive pole of the battery;

A triode, the emitter is grounded, the collector is connected to the negative pole of the optocoupler, and the base receives a discharge control signal through an adjustable resistor and grounded through a resistor.

Preferably, the discharge control signal includes low level and high level. When the discharge control signal is high level, the discharge circuit of the solar LED lighting device is turned on, and the drive circuit obtains electric energy from the battery. When the discharge control signal is low In the state of electrical level, the discharge circuit of the solar LED lighting device is disconnected.

Preferably, the power supply is a +5V power supply.

The utility model has excellent performance, stability and reliability, simple circuit and low failure rate, and is suitable for existing solar lighting devices.

Description of drawings

What Fig. 1 shows is the circuit diagram of an embodiment of the utility model;

Figure 2 shows the circuit diagram of the optocoupler.

Detailed ways

The following will be combined with the accompanying drawings of the utility model to clearly and completely describe and discuss the technical solutions in the embodiments of the utility model. Obviously, what is described here is only a part of the utility model, not all examples, based on The embodiments of the present utility model and all other embodiments obtained by persons of ordinary skill in the art without making creative efforts all belong to the protection scope of the present utility model.

In order to facilitate the understanding of the embodiments of the present utility model, the following will further explain and illustrate by taking specific embodiments as examples in conjunction with the accompanying drawings, and each embodiment does not constitute a limitation to the embodiments of the present utility model.

As shown in Figure 1, the discharge circuit of the solar LED lighting device provided by the utility model includes:

With the power field effect transistor V5 as the core, its drain output controls the drive circuit, the source is grounded, the gate is connected to the output terminal of the optocoupler through the resistor R12; the positive pole of the Zener diode D4 is connected to the source and negative pole of the power field effect transistor V5 Connect the gate of the power field effect transistor V5; the resistor R13 is connected between the gate and the source of the power field effect transistor V5; the positive pole of the optocoupler is connected to the +5V power supply through the resistor R11, and the negative pole is connected to the collector of the triode V4; the triode The emitter of V4 is grounded, the base receives the discharge control signal through the adjustable resistor R10, and is grounded through the resistor R9. Adjusting R10 can change the bias voltage of transistor V4 to meet the conduction condition of V4.

When the discharge control signal gives a high level, the triode V4 is turned on, the optocoupler outputs a high level, the gate-source voltage of the power field effect transistor V5 is clamped at 10V, the power field effect transistor V5 is turned on, and the battery is charged to the battery through the drive circuit. The LED load supplies power. When the discharge control signal gives a low level, the triode V4 is cut off, the power field effect transistor V5 switch is in the off state, and the battery cannot supply power to the LED load.

In this embodiment, the power field effect transistor V5 adopts IRF3205, and the optocoupler adopts TLP250, but the utility model is not limited. The circuit diagram of the optocoupler TLP250 is shown in Figure 2, pin 1 and pin 4 Not connected, pin 2 is positive, pin 3 is negative, pin 5 is grounded, pin 6 and pin 7 are output terminals, and pin 8 is Vcc.

The above is only a preferred embodiment of the utility model, but the scope of protection of the utility model is not limited thereto, and any person familiar with the technical field can easily think of All changes or replacements should fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (3)

1. a discharge circuit of a solar LED lighting device, characterized in that, it is connected between a storage battery and a drive circuit of a solar LED lighting device, and the discharging circuit of the solar LED lighting device comprises: A power field effect transistor, the drain is connected to the driving circuit, the source is grounded, and a resistor is connected between the gate and the source of the power field effect transistor; A Zener diode, the anode of which is connected to the source of the power field effect transistor, and the cathode of which is connected to the gate of the power field effect transistor; An optocoupler, the output terminal is connected to the grid of the power field effect transistor, the ground terminal is grounded through a capacitor, the positive pole is connected to a power supply through a resistor, and the Vcc terminal is connected to the positive pole of the storage battery; A triode, the emitter is grounded, the collector is connected to the negative pole of the optocoupler, and the base receives a discharge control signal through an adjustable resistor and grounded through a resistor. 2. The discharge circuit of the solar LED lighting device according to claim 1, wherein the discharge control signal includes a low level and a high level, and when the discharge control signal is a high level, the The discharge circuit of the solar LED lighting device is turned on, the drive circuit obtains electric energy from the storage battery, and when the discharge control signal is at a low level, the discharge circuit of the solar LED lighting device is disconnected. 3. The discharge circuit of the solar LED lighting device according to claim 1, wherein the power supply is a +5V power supply.