阅读说明：本技术 一种便携式led照明设备光照延长电路 (illumination extension circuit of portable LED lighting equipment ) 是由 钱昶 于 2019-07-26 设计创作，主要内容包括：本发明公开了一种便携式LED照明设备光照延长电路,包括Li电池、光源和驱动模块,其中,驱动模块中含有控制中心；所述Li电池的输出端与所述驱动模块的一端连接,所述驱动模块的另一端与所述光源连接；本设计通过所述驱动模块中的单片机控制中心实现自适应亮度调节,同时通过算法改变电池输出电流,延长电池的续航能力。本发明能够在便于携带的基础上,实现自适应的LED的亮度调节,解决电池续航能力差的问题。(The invention discloses a portable LED lighting equipment illumination extension circuit, which comprises a Li battery, a light source and a driving module, wherein the driving module comprises a control center; the output end of the Li battery is connected with one end of the driving module, and the other end of the driving module is connected with the light source; the design realizes self-adaptive brightness adjustment through a singlechip control center in the driving module, and simultaneously changes the output current of the battery through an algorithm to prolong the endurance of the battery. The invention can realize the self-adaptive brightness adjustment of the LED on the basis of convenient carrying and solve the problem of poor battery endurance.)

1. A portable LED lighting equipment illumination extension circuit comprises a Li battery, a light source and a driving module, and is characterized in that the driving module comprises a control center;

The output end of the Li battery is connected with one end of the driving module, and the other end of the driving module is connected with the light source;

The Li battery is used for regulating the output current of the Li battery through an internal resistance algorithm to prolong the endurance capacity of the battery;

The light source mainly comprises an LED load and is connected with the current output end of the designed circuit;

The driving module specifically comprises a power supply driving and control center, and the control center can control the output power of the battery by adjusting the PWM duty ratio of the single chip microcomputer.

2. The illumination extension circuit of the portable LED lighting device as claimed in claim 1, wherein the output current of the Li battery is changed along with the change of the internal resistance of the battery, the output current is smaller when the internal resistance is larger, the output current is larger when the internal resistance is smaller, and the duty ratio of the BUCK circuit is adjusted by the resistance value of the internal resistance R to realize illumination extension of the LED lighting device.

3. the illumination extension circuit of claim 1, wherein the light source is a circuit formed by LED loads, and the lighting loads are controlled by the current output end of the driving circuit.

4. The illumination extension circuit of a portable LED lighting device as recited in claim 1, wherein said driving module comprises a power driving and control center; the former can supply energy to the whole design; the latter realizes the self-adaptive brightness adjustment of the equipment by adding a singlechip control center.

5. The portable LED lighting device illumination extension circuit of claim 2, wherein said Li battery, when calculating the internal resistance of the battery, uses the formula: i = β/R, where the output current value of the Li battery is represented by I, β is an energy saving coefficient (a value of β is calculated from experience and experiment and is half of a difference obtained by subtracting an internal resistance when the battery is at full charge from an internal resistance when the battery is at 50%), and R is the internal resistance of the Li battery (a calculation method is (no-load voltage-current voltage)/current output load current).

6. The illumination extension circuit of claim 4, wherein the driving module comprises a control center;

The LED lamp comprises a resistor R1, a resistor R2, a resistor R3, an operational amplifier AR1, a MOS tube Q1, a diode D1, an inductor L1, a capacitor C1, an LED lamp DS1, an LED lamp DS2 and an LED lamp DS 3;

One end of the resistor R1 is connected to a voltage signal Vin, one end of the resistor R2, a cathode of the diode D1, one end of the capacitor C1, and an anode of the LED lamp DS1, a power signal REF is connected to the other end of the resistor R1, the other end of the resistor R2, and a same-direction input end of the operational amplifier AR1, a reverse input end of the operational amplifier AR1 is connected to a microwave signal, an output end of the operational amplifier AR1 is connected to a G-pole of the MOS transistor, an S-pole of the MOS transistor is connected to one end of the resistor R3, the other end of the resistor R3 is grounded, a D-pole of the MOS transistor is connected to an anode of the diode D1 and one end of the inductor L1, the other end of the inductor L1 is connected to the other end of the capacitor C1 and a cathode of the LED lamp DS3, and a cathode of the LED lamp DS2 is connected to an anode of the LED lamp DS3, the anode of the LED lamp DS2 is connected with the cathode of the LED lamp DS 1.

7. The illumination extension circuit of the portable LED lighting device as claimed in claim 4, wherein the control center can control the power output of the battery, the constant current output generated by the BUCK circuit can control the LED lamp at the output end, and the control of the current of the LED lamp bead controls the output power of the battery (because the efficiency of the BUCK circuit is close to 100% and the voltage of the LED lamp bead string does not change with the current), and the control of the output power of the battery is finally realized by actually adjusting the PWM duty ratio of the BUCK circuit; the MOS tube gate PWM is obtained by a power signal Ref and a carrier signal through a comparator.

Technical Field

The invention relates to an illumination extension technology of lighting equipment, in particular to an illumination extension circuit of portable LED lighting equipment.

background

Portable LED lighting devices are essential in people's daily lives, and have a wide variety of styles, including LEDs such as flashlights, emergency lights, mine lights, headlights, and table lights. In daily life, people have great demand for portable LED lighting devices, which are easy to assemble and use due to their small size, but at the same time, the battery capacity of the lighting devices is very limited, so that the battery capacity and the cruising ability are important indexes in selecting the devices.

the conventional portable LED lighting equipment basically can only complete basic operation of manually turning on and off the lamp, and can only achieve manual brightness adjustment. The portable LED lighting equipment which can only switch on and off the lamp can only output full power in the using process and continuously carry out the lighting with the maximum brightness because the dimming cannot be carried out, so that the service time of the equipment is short in the state of being separated from the charging state, and the battery endurance is very poor. Although the battery endurance time is prolonged, the portable LED lighting equipment capable of dimming still needs manual intervention to adjust the brightness, the brightness cannot be adjusted in a self-adaptive mode, and the intelligent degree of the portable LED lighting equipment capable of dimming is not high.

In view of the above situation, the present invention provides a new circuit method capable of adaptively adjusting the brightness of the portable LED lighting device and extending the battery endurance.

Disclosure of Invention

The purpose of the invention is as follows: a portable LED lighting device illumination extension circuit is provided to solve the above problems.

The technical scheme is as follows: a portable LED luminaire illumination extension circuit comprising:

The Li battery, the light source and the driving module are characterized in that the driving module comprises a control center;

the output end of the Li battery is connected with one end of the driving module, and the other end of the driving module is connected with the light source;

The Li battery is used for regulating the output current of the Li battery through an internal resistance algorithm to prolong the endurance capacity of the battery;

the light source mainly comprises an LED load and is connected with the current output end of the designed circuit;

the driving module specifically comprises a power supply driving and control center, and the control center can control the output power of the battery by adjusting the PWM duty ratio of the single chip microcomputer.

According to one aspect of the invention, the output current of the Li battery is changed along with the change of the internal resistance of the battery, the output current is smaller when the internal resistance is larger, the output current is larger when the internal resistance is smaller, and the illumination extension of the LED lighting device is realized by adjusting the duty ratio of the BUCK circuit through the resistance value of the internal resistance R.

According to one aspect of the invention, the light source is a circuit composed of LED loads, and the lighting load is controlled by a current output end of the driving circuit.

According to one aspect of the invention, the driving module specifically comprises a power supply driving and control center; the former can supply energy to the whole design; the latter realizes the self-adaptive brightness adjustment of the equipment by adding a singlechip control center.

According to one aspect of the invention, the Li battery, when calculating the internal resistance of the battery, uses the formula: i = β/R, where the output current value of the Li battery is represented by I, β is an energy saving coefficient (a value of β is calculated from experience and experiment and is half of a difference obtained by subtracting an internal resistance when the battery is at full charge from an internal resistance when the battery is at 50%), and R is the internal resistance of the Li battery (a calculation method is (no-load voltage-current voltage)/current output load current).

According to one aspect of the invention, the drive module comprises a control center;

the LED lamp comprises a resistor R1, a resistor R2, a resistor R3, an operational amplifier AR1, a MOS tube Q1, a diode D1, an inductor L1, a capacitor C1, an LED lamp DS1, an LED lamp DS2 and an LED lamp DS 3;

One end of the resistor R1 is connected to a voltage signal Vin, one end of the resistor R2, a cathode of the diode D1, one end of the capacitor C1, and an anode of the LED lamp DS1, a power signal REF is connected to the other end of the resistor R1, the other end of the resistor R2, and a same-direction input end of the operational amplifier AR1, a reverse input end of the operational amplifier AR1 is connected to a microwave signal, an output end of the operational amplifier AR1 is connected to a G-pole of the MOS transistor, an S-pole of the MOS transistor is connected to one end of the resistor R3, the other end of the resistor R3 is grounded, a D-pole of the MOS transistor is connected to an anode of the diode D1 and one end of the inductor L1, the other end of the inductor L1 is connected to the other end of the capacitor C1 and a cathode of the LED lamp DS3, and a cathode of the LED lamp DS2 is connected to an anode of the LED lamp DS3, the anode of the LED lamp DS2 is connected with the cathode of the LED lamp DS 1.

According to one aspect of the invention, the control center can control the power output of the battery, the constant current output generated by the BUCK circuit can control the LED lamp at the output end, and the battery output power is controlled by controlling the current of the LED lamp bead (because the efficiency of the BUCK circuit is close to 100%, and the voltage of the LED lamp bead string basically does not change along with the current), and the battery output power is finally controlled by actually adjusting the PWM duty ratio of the BUCK circuit; the MOS tube gate PWM is obtained by a power signal Ref and a carrier signal through a comparator.

has the advantages that: the invention can solve the problems that the existing portable LED illumination can not carry out self-adaptive brightness adjustment and the battery endurance is poor. Details will be described below.

drawings

fig. 1 is a schematic block diagram of the present invention.

Fig. 2 is a graph comparing the range of a prior art LED lighting and the lighting apparatus of the present invention.

Fig. 3 is a graph of the output current of the Li battery of the present invention.

fig. 4 is a schematic diagram of power driving in the driving module of the present invention.

Fig. 5 is a control center schematic in the drive module of the present invention.

Detailed Description

As shown in fig. 1, in this embodiment, a portable LED lighting device illumination extension circuit mainly includes a Li battery, a light source, and a driving module.

The output end of the Li battery is connected with one end of the driving module, and the other end of the driving module is connected with the light source;

the singlechip control center in the driving module can realize the control of the output power of the battery by adjusting the PWM duty ratio of the internal BUCK circuit, and further realize the self-adaptive brightness adjustment of the equipment;

The output current of the Li battery is adaptively adjusted through an internal resistance algorithm, so that the brightness of the LED lamp can be controlled to be adjusted along with the voltage requirement, and the cruising ability of the battery is further prolonged.

in a further embodiment, the output current of the Li battery is changed along with the change of the internal resistance of the battery, the output current is smaller when the internal resistance is larger, the output current is larger when the internal resistance is smaller, and the duty ratio of the BUCK circuit is adjusted through the resistance value of the internal resistance R to realize the illumination extension of the LED lighting device. As shown in fig. 4, the no-load voltage refers to a voltage when the LED lamp does not operate, the on-load voltage refers to a voltage when the LED operates, and the load current refers to an output current of the battery.

By changing the value of the voltage signal Vin in the invention, the internal resistance value of the Li battery can be adaptively changed, and the output current of the battery can be further controlled. The output current is the current for supplying power to the LED load, and the efficiency of the BUCK circuit is close to 100%, so that the control of the current is actually the control of the PWM duty ratio of the BUCK circuit, and further the brightness of the LED load can be adjusted.

In a further embodiment, the light source is a circuit composed of LED loads, and the lighting load is controlled by a current output terminal of the driving circuit.

In a further embodiment, the driving module specifically includes a power driver and a control center. The former can supply energy to the whole design; as shown in fig. 5, the latter realizes the function of self-adaptive brightness adjustment of the device by adding a single chip control center.

In a further embodiment, the Li battery, when calculating the internal resistance of the battery, uses the formula: i = β/R. As shown in fig. 2, the output current value of the Li battery is represented by I, β is an energy saving coefficient (a value of β is calculated by experience and experiment, and is half of a difference obtained by subtracting the internal resistance when the battery is at full charge from the internal resistance when the battery is at 50%), and R is the internal resistance of the Li battery (calculated as (no-load voltage-current voltage)/current output load current).

In a further embodiment, the driving module comprises a control center;

The LED lamp comprises a resistor R1, a resistor R2, a resistor R3, an operational amplifier AR1, a MOS tube Q1, a diode D1, an inductor L1, a capacitor C1, an LED lamp DS1, an LED lamp DS2 and an LED lamp DS 3;

one end of the resistor R1 is connected to a voltage signal Vin, one end of the resistor R2, a cathode of the diode D1, one end of the capacitor C1, and an anode of the LED lamp DS1, respectively, a power signal Ref is connected to the other end of the resistor R1, the other end of the resistor R2, and a same-direction input end of the operational amplifier AR1, an opposite-direction input end of the operational amplifier AR1 is connected to a microwave signal, an output end of the operational amplifier AR1 is connected to a G-pole of the MOS transistor, an S-pole of the MOS transistor is connected to one end of the resistor R3, the other end of the resistor R3 is grounded, a D-pole of the MOS transistor is connected to an anode of the diode D1 and one end of the inductor L1, the other end of the inductor L1 is connected to the other end of the capacitor C1 and a cathode of the LED lamp DS3, respectively, and a cathode of the LED lamp DS2 is connected to an anode of the LED lamp DS3, the anode of the LED lamp DS2 is connected with the cathode of the LED lamp DS 1.

under the control of an external voltage signal Vin, the resistor R1 and the resistor R2 respectively control no-load-on-load voltage difference monitoring and load current monitoring, the input end of the operational amplifier AR1 is controlled through a carrier signal and a power signal Ref, the comparison circuit is completed, PWM of the BUCK circuit can be adjusted, and 100% efficiency is further completed. The MOS tube Q1, the inductor L1, the diode D1 and the capacitor C1 are used for completing buck-boost control, and the control function of circuit voltage is realized.

In a further embodiment, the control center can control the power output of the battery, the constant current output generated by the BUCK circuit can control the LED lamp at the output end, and the control of the current of the LED lamp bead controls the output power of the battery (because the efficiency of the BUCK circuit is close to 100%, and the voltage of the string of LED lamp beads does not change with the current), and the control of the output power of the battery is finally realized by adjusting the PWM duty cycle of the BUCK circuit; the MOS tube gate PWM is obtained by a power signal Ref and a carrier signal through a comparator. The design scheme can protect the service life of the storage battery under the condition of deep discharge.

In summary, the present invention has the following advantages: compared with the existing portable LED lighting equipment, the invention automatically adjusts the output current I by using an optimal and reasonable algorithm, completes the brightness self-adaptive design on the premise of not manually intervening, and increases the illumination time of the portable LED lighting equipment, thereby prolonging the service life of the lighting device to a great extent.

It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.