CN210007952U

CN210007952U - LED lamp drive control circuit

Info

Publication number: CN210007952U
Application number: CN201920317182.3U
Authority: CN
Inventors: 薛鋆
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-03-13
Filing date: 2019-03-13
Publication date: 2020-01-31
Anticipated expiration: 2029-03-13

Abstract

The utility model provides an kinds of LED lamp drive control circuit constitutes including battery, singlechip, the linear stabiliser of low dropout, electric capacity boost circuit, battery charge control circuit, MOS pipe drive circuit, MOS pipe and LED lamp plate, the square wave voltage of electric capacity boost circuit input, by singlechip direct output or through the output after current amplification, electric capacity boost circuit's lifting voltage promotes on battery voltage's basis, is equivalent to battery voltage stack LOD output voltage, electric capacity boost circuit's lifting voltage also can promote on the basis of LDO output, is equivalent to twice LDO output voltage, the utility model discloses a main advantage is the use quantity that can reduce electron device effectively, improves system reliability, reduces the hardware cost, reduces system's consumption simultaneously, extension system standby time.

Description

LED lamp drive control circuit

Technical Field

The utility model relates to a LED lighting system technical field, in particular to kinds of LED lamp drive control circuit.

Background

In an LED lighting system powered by a single lithium battery or a plurality of lithium batteries in parallel, the output voltage of the battery is 2.6V-4.2V, the PN junction voltage of the LED lamp bead is about 2.4-3.3V, and the voltage difference between the two is small, so that the LED brightness can be adjusted by directly adopting PWM (pulse width modulation) control. Because the circuit is simple, the cost is low, the reliability is high, and the application is more and more common.

However, the power transistor used for PWM (pulse width modulation) control is generally a MOS transistor (field effect transistor), and the total turn-on voltage needs to be more than 4.5V, but the output voltage of a single lithium battery is between 2.6V and 4.2V, and if the battery voltage is directly driven, the MOS transistor cannot be guaranteed to be completely turned on, which results in overheating and damage of the MOS transistor.

Therefore, the conventional control method adopts a special BOOST circuit to generate a voltage higher than 4.5V to supply to the MOS transistor driving circuit.

In FIG. 1, 1 is a battery, which provides 2.5-4.2V voltage; 2, a special boosting chip is used for boosting the battery voltage to 6V and supplying the battery voltage to an MOS tube driving circuit and an LDO (low dropout regulator); the 3 is LOD, and 6V voltage is converted into constant 3.6V to supply power to the singlechip; 4, the singlechip outputs a PWM (pulse-width modulation) adjusting signal and controls the battery to charge; 5 is a battery charging control circuit; 6 is MOS tube driving circuit, which is used to drive MOS tube; the MOS tube 7 is used as a power switch for adjusting the brightness of the LED; and 8, an LED lamp panel.

In the circuit of fig. 1, a special boost chip 2 is needed to boost the voltage to more than 4.5V (6V in the figure), which is high in cost.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing kinds of LED lamp drive control circuit to reduce the hardware cost, make circuit work more reliable, and reduce the static consumption of system, extension system standby time.

In order to achieve the above object, the utility model provides a following technical scheme:

LED lamp driving control circuit comprises a battery, a single chip microcomputer, a low-dropout linear regulator, a capacitor boosting circuit, a battery charging control circuit, an MOS tube driving circuit, an MOS tube and an LED lamp panel, wherein the battery provides voltage for the low-dropout linear regulator and the LED lamp panel, the low-dropout linear regulator converts the battery voltage into input voltage of the single chip microcomputer to supply power to the single chip microcomputer, the single chip microcomputer outputs square wave driving voltage to a capacitor boosting circuit, outputs PWM (pulse-width modulation) adjusting signals to the MOS tube driving circuit and outputs battery charging control signals to the battery charging control circuit, the input end of the capacitor boosting circuit is connected with the battery voltage or the output voltage of the low-dropout linear regulator, the battery voltage or the output voltage of the low-dropout linear regulator is boosted and then is output to the MOS tube driving circuit and the battery charging control circuit, the MOS tube driving circuit drives the MOS tube, and the MOS tube is connected with the LED lamp panel and.

According to aspects of the utility model, the capacitance boost circuit comprises diode D1, diode D2, electric capacity C1, electric capacity C2, the end of electric capacity C1 is connected the square wave drive voltage of singlechip output, the negative pole of diode D1 is connected to the other end of electric capacity C1, battery voltage or the output voltage of low dropout linear regulator is connected to the positive pole of diode D1, the positive pole of diode D2 is still connected to the other end of electric capacity C1, MOS pipe drive circuit and battery charging control circuit are connected to the negative pole of diode D2, the positive pole of diode D1 and the negative pole of diode D2 are connected respectively to the both ends of electric capacity C2.

According to the utility model discloses an aspects, electric capacity boost circuit promotes 2.5V-3.6V on battery voltage's basis, makes MOS pipe drive voltage reach 5.0V-7.8V.

According to the utility model discloses an aspects, electric capacity boost circuit promotes 2.5V-3.6V on low dropout linear voltage regulator output voltage's basis, makes MOS pipe drive voltage reach 5.0V-7.2V.

Due to the adoption of the scheme, the beneficial effects of the utility model are that:

the square wave voltage input by the capacitance booster circuit is directly output by the singlechip or output after current amplification; the boost voltage of the capacitor booster circuit is boosted on the basis of the battery voltage, and is equivalent to the battery voltage superposed LOD output voltage; the boost voltage of the capacitor boost circuit can also be boosted on the basis of the output of the LDO, which is equivalent to twice the output voltage of the LDO. The utility model discloses a main advantage is for reducing electron device's use quantity effectively, improves system reliability, reduces the hardware cost, reduces system's consumption simultaneously, extension system stand-by time.

Drawings

Fig. 1 is a circuit diagram of a prior art LED lamp driving control circuit.

Fig. 2 is a embodiment of the LED lamp driving control circuit of the present invention.

Fig. 3 is a diagram of a second embodiment of the LED lamp driving control circuit of the present invention.

Detailed Description

The technical solution 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 , but not all embodiments.

The utility model discloses as shown in fig. 2 and fig. 3, battery voltage directly supplies with LDO and for the singlechip power supply, singlechip port output square wave voltage (directly export or export after current amplification), through electric capacity boost circuit promote on battery voltage's basis (fig. 2), or promote on the basis of LDO voltage (fig. 3) to supply with MOS pipe drive circuit and battery charge control circuit.

[ example ]

Referring to fig. 2, 1 is a battery, 2.5-4.2V voltage is provided, 2 is a single chip microcomputer, square wave driving voltage of a capacitor boosting circuit is output, a PWM regulation signal is output, a battery charging control signal is output, 3 is an LDO (low dropout regulator) for limiting input voltage of the single chip microcomputer, 4 is a capacitor boosting circuit and consists of a diode D1, a diode D2, a capacitor C1 and a capacitor C2, referring to fig. 2, a end of a capacitor C1 is connected with the square wave driving voltage output by the single chip microcomputer, the other end of the capacitor C1 is connected with a cathode of a diode D1, an anode of a diode D1 is connected with battery voltage, the other end of the capacitor C1 is also connected with an anode of a diode D2, a cathode of the diode D2 is connected with a MOS tube driving circuit and a battery charging control circuit, two ends of the capacitor C2 are respectively connected with an anode of a diode D1 and a cathode of a diode D2, the capacitor boosting circuit boosts 2.5V-3.6V voltage on the basis of the battery voltage, the capacitor boosting circuit is used for adjusting the voltage of the MOS tube driving circuit, and the lamp panel voltage of the MOS tube driving circuit is a lamp panel driving circuit is adjusted to be equal to.

[ example two ]

Referring to fig. 3, 1 is a battery, 2.5-4.2V voltage is provided, 2 is a single chip microcomputer, square wave driving voltage of a capacitor boosting circuit is output, a PWM regulation signal is output, a battery charging control signal is output, 3 is an LDO (low dropout regulator) for limiting input voltage of the single chip microcomputer, 4 is a capacitor boosting circuit and consists of a diode D1, a diode D2, a capacitor C1 and a capacitor C2, referring to fig. 3, a end of a capacitor C1 is connected with the square wave driving voltage output by the single chip microcomputer, the other end of the capacitor C1 is connected with a cathode of a diode D1, an anode of a diode D1 is connected with the output voltage of the low dropout regulator, the other end of the capacitor C1 is also connected with an anode of a diode D2, a cathode of a diode D38 is connected with a MOS tube driving circuit and a battery charging control circuit, two ends of the capacitor C2 are respectively connected with an anode of a diode D1 and a cathode of a diode D2, the capacitor boosting circuit is used for boosting the voltage to reach 2.5V-3.6V voltage on the basis of the capacitor boosting circuit, and the MOS tube driving circuit is used for adjusting the brightness of the LED lamp panel to be an LED lamp panel voltage, and the lamp voltage is a lamp.

To sum up, use the utility model discloses the time, components and parts are less, reduce the hardware cost, make circuit work more reliable to the static consumption of greatly reduced system, extension system stand-by time.

It will be readily apparent to those skilled in the art that various modifications may be made to the embodiments and the -like principles described herein may be applied to other embodiments without the use of inventive faculty.

Claims

The LED lamp driving control circuit is characterized by comprising a battery, a single chip microcomputer, a low-dropout linear voltage regulator, a capacitor boosting circuit, a battery charging control circuit, an MOS tube driving circuit, an MOS tube and an LED lamp panel, wherein the battery provides voltage for the low-dropout linear voltage regulator and the LED lamp panel, the low-dropout linear voltage regulator converts the voltage of the battery into input voltage of the single chip microcomputer to supply power to the single chip microcomputer, the single chip microcomputer outputs square wave driving voltage to a capacitor boosting circuit, outputs PWM (pulse-width modulation) adjusting signals to an MOS tube driving circuit and outputs battery charging control signals to the battery charging control circuit, the input end of the capacitor boosting circuit is connected with the voltage of the battery or the output voltage of the low-dropout linear voltage regulator, the battery voltage or the output voltage of the low-dropout linear voltage regulator is boosted and then output to the MOS tube driving circuit and the battery charging control circuit, the MOS tube driving circuit drives the MOS tube, and the MOS tube is connected with the.
2. The LED lamp driving control circuit according to claim 1, wherein the capacitance boosting circuit comprises a diode D1, a diode D2, a capacitor C1 and a capacitor C2, wherein a end of the capacitor C1 is connected with a square wave driving voltage output by the single chip microcomputer, another end of the capacitor C1 is connected with a cathode of a diode D1, an anode of the diode D1 is connected with a battery voltage or an output voltage of the low dropout linear regulator, another end of the capacitor C1 is further connected with an anode of a diode D2, a cathode of the diode D2 is connected with the MOS tube driving circuit and the battery charging control circuit, and two ends of the capacitor C2 are respectively connected with an anode of a diode D1 and a cathode of a diode D2.
3. The kinds of LED lamp drive control circuit of claim 1, wherein the capacitor boosting circuit boosts 2.5V-3.6V based on the battery voltage to make the MOS tube drive voltage reach 5.0V-7.8V.
4. The kinds of LED lamp drive control circuit of claim 1, wherein the capacitor boosting circuit boosts 2.5V-3.6V based on the output voltage of the low dropout regulator to make the MOS tube drive voltage reach 5.0V-7.2V.