CN211457431U

CN211457431U - Automatic control circuit for solar lamp

Info

Publication number: CN211457431U
Application number: CN202020467944.0U
Authority: CN
Inventors: 关锦明
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-04-02
Filing date: 2020-04-02
Publication date: 2020-09-08
Anticipated expiration: 2030-04-02

Abstract

The utility model discloses an automatic control circuit for solar lamp, including photovoltaic board charge detection circuitry, control chip and dimming control circuit, photovoltaic board charge detection circuitry includes second resistance, third resistance, diode and second electric capacity for detect the voltage of photovoltaic board, and output high-low level signal gives control chip, control chip has PWM signal output, accepts the photovoltaic board charge detection circuitry's output signal, and output PWM signal gives dimming control circuit, dimming control circuit includes first resistance, emitting diode, MOS pipe and fourth resistance, the PWM signal control that the MOS pipe sent by control chip realizes emitting diode brightness control. The utility model provides a pair of automatic control circuit for solar lamp passes through PWM and adjusts luminance, and power falls to thirty percent fixed along with time, compares in the market that the first half is brighter night, and the capacity of battery is saved more at the back half night, and circuit layout is succinct, and life is longer.

Description

Automatic control circuit for solar lamp

Technical Field

The utility model relates to a lamps and lanterns technical field, especially a solar energy is automatic control circuit for lamps and lanterns.

Background

With the development of photovoltaic technology, the utilization of solar energy has been widely applied to various fields, and at present, solar energy is converted into electric energy by a solar photovoltaic panel in the daytime and stored in a storage battery of a solar garden lamp or a solar street lamp which is powered by solar energy on the market, the storage battery supplies power for a constant current driving circuit at night, and the constant current driving circuit outputs constant current to light an LED light source.

However, the conventional LED lamp controller can only control the on-off of the LED lamp according to the preset on-off time, the brightness of the LED lamp cannot be automatically adjusted according to the front and back midnight, the brightness of the photovoltaic LED lamp is high, and high-intensity illumination is not needed in the back midnight, so that a large amount of electric energy is wasted.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an automatic control circuit for solar lamp, through detecting the automatic light, the lamp of turning off of photovoltaic board voltage, PWM output signal's pulse width modulation LED illumination luminance to practice thrift the electric energy.

According to the utility model discloses an automatic control circuit is used to solar lamp, including photovoltaic board charge detection circuitry, control chip and dimming control circuit, photovoltaic board charge detection circuitry includes second resistance, third resistance, diode and second electric capacity for detect the voltage of photovoltaic board, and output high-low level signal gives control chip, control chip has PWM signal output, accepts the output signal of photovoltaic board charge detection circuitry, and output PWM signal gives dimming control circuit, dimming control circuit includes first resistance, emitting diode, MOS pipe and fourth resistance, the PWM signal control that the MOS pipe sent by control chip realizes emitting diode brightness control.

Further, the first end of second resistance is coupled with photovoltaic board charging power supply among the photovoltaic board detection circuitry that charges, the second end of second resistance is coupled with the first end of third resistance, the second end ground connection of third resistance, diode and second electric capacity are parallelly connected with the third resistance respectively, and the negative pole of diode is coupled with control chip's TYN pin.

Furthermore, a first capacitor is connected in parallel between the VCC pin and the GND pin of the control chip.

Furthermore, a first end of a first resistor in the dimming control circuit is coupled to a battery power supply, a second end of the first resistor is coupled to an anode of the light emitting diode, a gate of the MOS transistor is coupled to a PWM pin of the control chip, a source of the MOS transistor is grounded, a drain of the MOS transistor is coupled to a cathode of the light emitting diode, and a first end and a second end of the fourth resistor are coupled to the gate of the MOS transistor and the source of the MOS transistor, respectively.

On the basis of the scheme, the MOS tube is an N-channel enhancement type MOS tube.

On the basis of the scheme, the voltage of the battery power supply is less than 36V.

Further, still including being used for the step-down circuit for the control chip power supply, the step-down circuit includes the step-down chip, the VCC pin of step-down chip inserts battery power, and the GND pin ground connection of step-down chip, the OUT pin output power supply after the step-down of step-down chip.

Compared with the prior art, the utility model beneficial effect who has is:

1. the photovoltaic panel is powered off by self induction, the lamp is automatically turned on, the control chip is provided with PWM (pulse-width modulation) signal output, the LED illumination brightness is adjusted by the pulse width of the PWM output signal, and the power is reduced by two percent every ten minutes through a preset program and is fixed by thirty percent. Compared with the products on the market, the battery is brighter in the first half night and saves the capacity of the battery in the second half night.

2. The circuit layout is simple, and the yield of mass production is improved by 5%.

3. The battery adopts safe direct current lower than 36V, so that the safety hidden danger of people is avoided, and the service life is longer.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a circuit diagram of an automatic control circuit for a solar lamp according to the present invention.

Fig. 2 is a circuit diagram of the step-down circuit.

Fig. 3 is a circuit diagram of an automatic control circuit for a solar lamp according to another embodiment.

Wherein, the reference numbers:

r1: a first resistor

R2: second resistance

R3: third resistance

R4: fourth resistor

R5: fifth resistor

D1: light emitting diode

D2: diode with a high-voltage source

Q1: MOS tube

C1: first capacitor

C2: second capacitor

U1: control chip

U2: step-down chip

U3: infrared receiving head

TYN: photovoltaic panel charging source

B: a battery power source.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The LED is a direct current power supply device, can be easily manufactured into a direct current lamp and is widely applied to a direct current system, such as a solar lamp product. After the solar photovoltaic LED lamp darkens to a certain degree (dark, cloudy or fog and the like) in ambient light, the battery provides power for the load (the LED light-emitting plate), and if the illumination brightness of the LED lamp is not controlled, the electric energy consumption of the battery is high, so that the electric energy is wasted, and the service time is shortened.

Referring to fig. 1, an automatic control circuit for a solar lamp comprises a photovoltaic panel charging detection circuit, a control chip U1 and a dimming control circuit, wherein the photovoltaic panel charging detection circuit comprises a second resistor R2, a third resistor R3, a diode D2 and a second capacitor C2, used for detecting the voltage of the photovoltaic panel and outputting high and low level signals to the control chip U1, the control chip U1 adopts an IC integrated chip LP6482SPR with PWM signal output, the control chip U1 receives the output signals of the photovoltaic panel charging detection circuit, and output PWM signal to the dimming control circuit, the dimming control circuit includes first resistance R1, emitting diode D1, MOS pipe Q1 and fourth resistance R4, MOS pipe Q1 is as the switch tube, is N channel enhancement mode MOS pipe, has little on resistance, and switching speed is fast, has fine switching performance, and the PWM signal control that is sent by control chip U1 realizes emitting diode brightness control.

The first end of a second resistor R2 in the photovoltaic panel charging detection circuit is coupled with a photovoltaic panel charging power supply TYN +, the second end of a second resistor R2 is coupled with the first end of a third resistor R3, the second end of the third resistor R3 is grounded, a diode D2 and a second capacitor C2 are connected with a third resistor R3 in parallel respectively, and the negative electrode of the diode D2 is coupled with a TYN pin of a control chip U1.

Referring to fig. 2, the voltage reduction circuit for supplying power to the control chip U1 is further included, the voltage reduction circuit includes a voltage reduction chip U2, the voltage reduction chip U2 adopts a CP7530 voltage reduction chip, a VCC pin of the voltage reduction chip U2 is connected to the battery power supply B, a GND pin of the voltage reduction chip U2 is grounded, and an OUT pin of the voltage reduction chip U2 outputs the power supply after voltage reduction. The VCC pin of the control chip U1 is connected to a power supply, and the GND pin of the control chip U1 is grounded.

The voltage of the battery power supply B is less than 36V, safe direct current lower than 36V is adopted, no potential safety hazard exists, and the service life is longer.

In order to provide a more stable power supply for the control chip U1, a first capacitor C1 is connected in parallel between the VCC pin and the GND pin of the control chip U1, and the first capacitor C1 is a decoupling capacitor, so that the more stable power supply can be provided, the noise of the component coupled to the power supply terminal can be reduced, and the influence of the noise of the component on other components can be indirectly reduced.

In the dimming control circuit, a first end of a first resistor R1 is coupled to a battery power supply B, a second end of the first resistor R1 is coupled to an anode of a light emitting diode D1, a gate of a MOS transistor Q1 is coupled to a PWM pin of a control chip U1, a source of the MOS transistor Q1 is grounded, a drain of the MOS transistor Q1 is coupled to a cathode of the light emitting diode D1, and a first end and a second end of a fourth resistor R4 are coupled to a gate of a MOS transistor Q1 and a source of the MOS transistor Q1, respectively. The control chip U1 can provide the required gate charge for the grid of MOS pipe Q1 to guarantee the switching performance of the device, realize the electric isolation between the main circuit and the control circuit, and have stronger anti-jamming capability.

The control chip U1 function foot detects the photovoltaic board voltage, and when the voltage was greater than 1.5V the light was closed, and when the voltage was less than 1.5V, condenser C2 discharged, and photovoltaic board charge detection circuit output high level. When the photovoltaic panel charging detection circuit gives a high level, the control chip U1 outputs the high level, the gate-source voltage of the MOS tube Q1 is clamped, at the moment, the MOS and the tube Q1 are conducted, the storage battery supplies power to the load, otherwise, when the low level is given, the storage battery is in a disconnected state, and the battery cannot supply power to the load-light emitting diode D1. The luminance of the light emitting diode D1 is controlled by controlling the time when the light emitting diode D1 is on, and the duty ratio of the output PWM is fixed. If the power is reduced by 2% per minute, the duty ratio of PWM is reduced by 2%; the 30% power is that the duty ratio of PWM fixes at 30%, every ten minutes falls two percent power, falls thirty percent fixed, compares to the product on the market that the former half night is brighter, the latter half night more saves the capacity of battery.

Referring to fig. 3, in another embodiment, the apparatus further includes an infrared remote control receiving circuit, where the infrared remote control receiving circuit includes an infrared receiving head U3 and a fifth resistor R5, a model of the infrared receiving head U3 is LF1738 infrared receiving head, a signal output pin of the infrared receiving head U3 is coupled to an IR pin of the control chip U1, a first end of the fifth resistor R5 is coupled to a signal output pin of the infrared receiving head U3, a second end of the fifth resistor R5 is coupled to a power supply, a power supply pin of the infrared receiving head U3 is coupled to the power supply, and a ground pin of the infrared receiving head U3 is grounded. The infrared remote control receiving circuit receives the infrared remote control signal and sends the infrared remote control signal to the control chip U1, so that the operation of turning on and off the remote control LED lamp is realized, and the convenience of operation is improved.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides an automatic control circuit for solar lamp, includes that photovoltaic board charges detection circuitry, control chip and dimming control circuit, photovoltaic board charges detection circuitry includes second resistance, third resistance, diode and second electric capacity for detect the voltage of photovoltaic board, and export high-low level signal and give control chip, control chip has PWM signal output, accepts the output signal that photovoltaic board charges detection circuitry, and exports PWM signal and give dimming control circuit, dimming control circuit includes first resistance, emitting diode, MOS pipe and fourth resistance, the MOS pipe is controlled by the PWM signal that control chip sent, realizes emitting diode brightness control.

2. The automatic control circuit for the solar energy lamp as claimed in claim 1, wherein: the first end of second resistance is coupled with photovoltaic board charging source among the photovoltaic board detection circuitry that charges, the second end of second resistance is coupled with the first end of third resistance, the second end ground connection of third resistance, diode and second electric capacity are parallelly connected with the third resistance respectively, and the negative pole of diode is coupled with control chip's TYN pin.

3. The automatic control circuit for the solar energy lamp as claimed in claim 1, wherein: a first capacitor is connected in parallel between the VCC pin and the GND pin of the control chip.

4. The automatic control circuit for the solar energy lamp as claimed in claim 1, wherein: the first end of a first resistor in the dimming control circuit is coupled with a battery power supply, the second end of the first resistor is coupled with the anode of the light emitting diode, the grid of the MOS tube is coupled with the PWM pin of the control chip, the source of the MOS tube is grounded, the drain of the MOS tube is coupled with the cathode of the light emitting diode, and the first end and the second end of a fourth resistor are respectively coupled with the grid of the MOS tube and the source of the MOS tube.

5. The automatic control circuit for the solar energy lamp as claimed in claim 4, wherein: the MOS tube is an N-channel enhanced MOS tube.

6. The automatic control circuit for the solar energy lamp as claimed in claim 4, wherein: the voltage of the battery power supply is less than 36V.

7. The automatic control circuit for the solar energy lamp as claimed in claim 1, wherein: still including being used for the step-down circuit for the control chip power supply, the step-down circuit includes the step-down chip, the VCC pin of step-down chip inserts battery power, and the GND pin ground connection of step-down chip, the OUT pin output power supply after the step-down of step-down chip.