CN111884322A - Battery self-adaptation solar light-operated boost circuit - Google Patents

Battery self-adaptation solar light-operated boost circuit Download PDF

Info

Publication number
CN111884322A
CN111884322A CN202010758019.8A CN202010758019A CN111884322A CN 111884322 A CN111884322 A CN 111884322A CN 202010758019 A CN202010758019 A CN 202010758019A CN 111884322 A CN111884322 A CN 111884322A
Authority
CN
China
Prior art keywords
circuit
resistor
power supply
pin
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010758019.8A
Other languages
Chinese (zh)
Inventor
陈长兴
班福奎
杨义凯
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Shiningic Electronic Technology Co ltd
Original Assignee
Shanghai Shiningic Electronic Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai Shiningic Electronic Technology Co ltd filed Critical Shanghai Shiningic Electronic Technology Co ltd
Priority to CN202010758019.8A priority Critical patent/CN111884322A/en
Publication of CN111884322A publication Critical patent/CN111884322A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/005—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting using a power saving mode
    • H02J9/007—Detection of the absence of a load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00—Integration of renewable energy sources in buildings
    • Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
    • Y04S20/20—End-user application control systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Dc-Dc Converters (AREA)

Abstract

A battery self-adaptive solar light-operated booster circuit comprises a solar charging control circuit, a battery low-power turn-off circuit, an enabling control circuit, a driving control circuit, a PFM control circuit and a power supply switching circuit; the peripheral circuit only comprises an inductor and a capacitor required by circuit boosting and a solar panel required by solar light control introduction. The solar charging management is realized through the solar charging control circuit, the on and off of the boosting circuit are controlled through the battery low-power turn-off circuit and the enabling control circuit, and particularly, the power supply switching circuit is added, so that the output voltage can be thoroughly turned off during the enabling control and light-operated charging. The invention effectively solves the problem of electric quantity loss when the battery power supply is gradually reduced, can greatly improve the service time of the battery, and simultaneously improves the input wide-range application by thoroughly cutting off the output voltage.

Description

Battery self-adaptation solar light-operated boost circuit
Technical Field
The invention belongs to the technical field of lighting circuits, and relates to a battery self-adaptive solar light-operated voltage boosting circuit.
Background
Under the big environment of green life advocated at present, outdoor lighting such as park, square, outdoor advertising lamp uses and begins to adopt solar energy supplementary energy and control mode generally, can not only make full use of present sustainable energy, has also saved the consumption of traditional energy simultaneously greatly, has reduced the emission of pollution. In practical applications, the LEDs such as lawn lamps and light strings often need to be powered more than their on-state voltage, which requires a boosting function when powered by a solar cell.
The LED controller circuit with the boosting function widely applied to the market mainly comprises the following circuit forms: a constant current control circuit, a constant voltage control circuit and the like. It is clear to those skilled in the art of solar lighting circuits that when a constant voltage circuit is operated, the output voltage is constant and specific, and although the LED load can be guaranteed to be constant in brightness all the time, the input current is larger and larger as the battery power decreases and the energy conservation is maintained, so that the battery voltage is powered down more and more quickly. This allows the input constant current application to be further developed, which is more convenient in calculating power consumption and battery life time and easier to determine the charging current due to the constant input current, thereby realizing charge-discharge balance.
However, as the output-off battery is adjusted back due to over-discharge, the boost circuit starts to operate again. This causes the output to be high or low after the battery power is low, and especially, when the constant current control circuit controls the LED load to work, the phenomenon becomes more obvious, which makes the battery low power detection and turn-off more important.
Specifically, when solar light accuse is stepped up and is used, when adopting two solar energy dry battery or lithium cell that establish ties, output voltage is the same with input voltage after the solar charging, and LED turn-on voltage is less than two dry battery and lithium cell voltage, this LED load is bright when will leading to solar charging, this phenomenon not only is not conform to customer's custom, the resource has also been wasted simultaneously, consequently, be applied to products such as lawn lamp, solar lamp cluster in the market often can meet the application and be restricted, under the condition of no external turn-off circuit, the solar charging that only can be used to a battery is stepped up and is used.
In addition, the conventional solar light-operated booster circuit is often formed by a booster chip, a solar charging control circuit and other circuits, so that the area of a PCB (printed circuit board) and the number of peripheral tubes are increased in the practical application process of a client, and the practical use cost is greatly increased.
Disclosure of Invention
The invention mainly aims to provide a brand-new battery self-adaptive solar light-controlled boosting circuit, which not only solves the problem of unstable voltage in solar charging boosting, but also can reduce the area of a PCB (printed circuit board) and the number of peripheral pipes thereof, greatly saves power consumption and further realizes the purposes of energy conservation and emission reduction.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a battery self-adaptive solar light-operated booster circuit comprises a chip internal circuit and a peripheral circuit; the peripheral circuit comprises an inductor L, a solar panel solar, a battery and an output capacitor Cout; the chip internal circuit comprises a booster circuit, a solar charging control circuit, a PFM control circuit, a PMOS transistor MP1, a PMOS transistor MP2, an NMOS transistor MN1, a drive circuit and a power supply switching circuit; the solar panel solar is connected between a pin SOL and a ground terminal GND, the output capacitor Cout is connected between a power supply VDD and the ground terminal GND, the solar charging control circuit comprises a first input end, a second input end, a third input end, a first output end, a second output end and a third output end, the first input end and a source electrode of the PMOS transistor MP2 are connected with the pin BAT, the second input end and a drain electrode of the PMOS transistor MP2 are connected with the pin SOL, the third input end is connected with the PFM control circuit, the first output end is connected with a grid electrode of the PMOS transistor MP2, and the second output end and the third output end are respectively connected with the driving circuit and provide an enable signal EN1 for the power supply switching circuit; the driving circuit comprises a first input end, a second input end, a first output end and a second output end, the power supply switching circuit comprises a first input end, a second input end, a first output end and a second output end, the first output end and the second output end are connected with the grids of the PMOS transistor MP1 and the NMOS transistor MN1, the drains of the PMOS transistor MP1 and the NMOS transistor MN1 are connected with the pin LX, the source of the PMOS transistor MP1 is connected with the first output end of the power supply switching circuit, the second output end of the power supply switching circuit is connected with the power supply VDD, the power supply switching circuit comprises a first input end connected with the ground terminal GND and a second input end connected with the enable signal EN1, the inductor L is connected between the pin LX and the pin SOL, and the battery is connected between the pin SOL and the ground terminal GND;
the signal of the pin BAT and the signal of the pin SOL generate an enable signal EN1 through the solar charging control circuit, the output of the boost circuit is the same as the voltage of the power supply VDD under the normal work and no light control condition, and the output of the boost circuit is the same as the voltage of the ground terminal GND when the light control charging or the enabling is turned off.
Further, the battery self-adaptive solar light-operated boost circuit further comprises an enabling circuit, wherein the input end of the enabling circuit receives a signal received by a pin EN and outputs an enabling signal EN2, the power supply switching circuit further comprises a third input end, the third input end receives an enabling signal EN2 and supplies the enabling signal EN and the ground end GND signal to the power supply switching circuit so as to output the voltage of the power supply VDD or the voltage of the ground end GND.
Further, the power supply switching circuit includes a first switch key1, a second switch key2, a nor gate and an inverter; two input ends of the nor gate are respectively connected with the enable signal EN1 and the enable signal EN2, the first switch key1 is connected between an internal power supply pin VDD1 and the power supply VDD signal, and the second switch key2 is connected between the ground terminal GND signal and the power supply VDD signal; the nor gate controls the conduction of the first switch key1, the inverter controls the conduction of the first switch key2, and the output VDD is switched to the ground GND signal when the enable signal EN1 and the enable signal EN2 are turned off.
Furthermore, the battery self-adaptive solar light-operated boost circuit further comprises a battery low-power turn-off circuit, the power supply switching circuit further comprises a fourth input end, the battery low-power turn-off circuit receives the pin BAT signal to generate a control signal CTL, the fourth input end receives the control signal CTL, and when the pin BAT signal indicates that the battery power is insufficient, the power supply switching circuit generates a turn-off signal; the signal of the pin LX, the enable signal EN1 and the control signal CTL generate the internal power supply pin VDD1 signal through the voltage boosting circuit and supply the internal power supply pin VDD1 signal to the power supply switching circuit so as to output the power supply VDD signal.
Further, the low battery power shutdown circuit comprises a resistor R8, a resistor R9, a resistor R10, a resistor R11, a MOS transistor 3, a MOS transistor 4, and a schmitt trigger, wherein the resistor R8, the resistor R9, and the resistor R10 are sequentially connected in series between the pin BAT and the ground terminal GND, and the resistor R11 is connected to the internal power supply pin vdd1 and an input end of the schmitt trigger; the grid electrode of the MOS transistor 3 is connected with the connection point of the resistor R8 and the resistor R9, the drain electrode is connected with the input end of the Schmitt trigger, and the source electrode is connected with the grounding end GND; the grid of the MOS transistor 4 is connected with the output end of the Schmitt trigger, the drain of the MOS transistor 4 is connected with the connection point of the resistor R9 and the resistor R10, and the source of the MOS transistor 4 is connected with the ground end GND; the output of the schmitt trigger outputs the control signal CTL.
Further, the MOS transistor 3 and the MOS transistor 4 are NMOS transistors.
Further, the boost circuit comprises a resistor R1, a resistor R2, a resistor R3, an operational amplifier and a MOS transistor MN0, wherein the resistor R1, the resistor R2 and the resistor R3 are sequentially connected in series between the pin BAT and the ground terminal GND, the anode of the operational amplifier is connected to the pin SOL, the cathode of the operational amplifier is connected to the connection point of the resistor R1 and the resistor R2, the drain of the MOS transistor MN0 is connected to the connection point of the resistor R2 and the resistor R3, and the source of the MOS transistor MN0 is connected to the ground terminal GND; the gate of the MOS transistor MN0 is connected with the output end of the operational amplifier; the output terminal of the operational amplifier outputs the enable signal EN 1.
Further, the solar charging control circuit comprises a resistor R4, a resistor R5, an operational amplifier and a MOS transistor MP0, wherein the resistor R4 and the resistor R5 are sequentially connected in series between the pin SOL and the ground terminal GND, the anode of the operational amplifier is connected with the pin BAT, the cathode of the operational amplifier is connected with the connection point of the resistor R4 and the resistor R5, the drain of the MOS transistor MP0 is connected with the pin SOL, and the source of the MOS transistor MP0 is connected with the pin BAT; the gate of the MOS transistor MP0 is connected to the output terminal of the operational amplifier.
According to the technical scheme, the self-adaptive solar light-controlled voltage boosting circuit of the battery provides a scheme capable of effectively solving the problems of solar charging and constant-current output voltage, solar charging management is achieved through the solar charging control circuit, the on and off of the voltage boosting circuit are controlled through the low-power-quantity turn-off circuit and the enabling control circuit of the battery, and particularly, the power supply switching circuit is added, so that the output voltage can be completely turned off during enabling control and light-controlled charging. Therefore, the invention effectively solves the problem of electric quantity loss when the battery power supply is gradually reduced, can greatly improve the service time of the battery, and simultaneously improves the input wide-range application by thoroughly cutting off the output voltage. That is, the circuit can be used in a wide operating voltage range, and when the supply voltage is higher than the internally set minimum operating threshold voltage, the output voltage can be ensured to be kept constant without being affected by the supply voltage.
In addition, the invention provides a constant voltage output mode and adopts a low power consumption design, thereby ensuring the service life of the battery under the state of charging or not outputting the load, greatly saving energy, adding an enabling turn-off function, completely turning off the output when the load is not required to be output, greatly saving power consumption, and simultaneously solving the problem of repeated output voltage in the turn-off and turn-on process of the battery.
Drawings
FIG. 1 is a block diagram of a battery adaptive solar photo-controlled boost circuit according to an embodiment of the present invention
FIG. 2 is a schematic diagram of a boost circuit according to an embodiment of the present invention
FIG. 3 is a detailed circuit diagram of a solar charging circuit according to an embodiment of the invention
FIG. 4 is a diagram of a low battery turn-off circuit according to an embodiment of the present invention
FIG. 5 is a schematic diagram of a power supply switching circuit according to an embodiment of the invention
Detailed Description
The following description of the present invention will be made in detail with reference to the accompanying drawings 1 to 5.
It should be noted that the present invention is applied to a solar photo-controlled boost circuit based on a constant current control circuit, and the constant current control circuit may be a PWM (pulse width modulation) type control circuit or a PFM (pulse frequency modulation) type control circuit. In the embodiment of the present invention, a PFM (pulse frequency modulation) type control circuit is explained as an example.
Referring to fig. 1, fig. 1 is a schematic block diagram of a battery adaptive solar photo-controlled boost circuit according to an embodiment of the present invention. As shown in fig. 1, the battery adaptive solar light-controlled boost circuit includes a chip internal circuit and a peripheral circuit; the peripheral circuit comprises an inductor L, a solar panel solar, a battery and an output capacitor Cout; the chip internal circuit comprises a booster circuit, a solar charging control circuit, a PFM control circuit, a PMOS transistor MP1, a PMOS transistor MP2, an NMOS transistor MN1, a drive circuit and a power supply switching circuit. That is, the present invention integrates all the functional modules into one chip, which reduces the PCB area and the number of peripheral pipes in the practical application process. The solar energy self-adaptive boost circuit is mainly characterized in that a power supply switching circuit is additionally arranged, so that the solar energy self-adaptive boost circuit can be used in a wider working voltage range, the output can be directly turned off after the electric quantity of a solar battery is lower by additionally arranging a battery low-electric-quantity turn-off circuit, the condition that the output of an LED lamp is suddenly high and suddenly low in brightness is avoided, and the battery self-adaptive boost circuit can be ensured to be out of work under the condition that a user does not use the solar LED lamp for a period of time by additionally arranging an enabling circuit.
As shown in fig. 1, in an embodiment of the present invention, the solar panel solar is connected between a pin SOL and a ground terminal GND, the output capacitor Cout is connected between a power supply VDD and the ground terminal GND, the solar charging control circuit includes a first input terminal, a second input terminal, a third input terminal, a first output terminal, a second output terminal, and a third output terminal, the first input terminal and a source of the PMOS transistor MP2 are connected to the pin BAT, the second input terminal and a drain of the PMOS transistor MP2 are connected to the pin SOL, the third input terminal is connected to the PFM control circuit, the first output terminal is connected to a gate of the PMOS transistor MP2, and the second output terminal and the third output terminal are respectively connected to the driving circuit and provide an enable signal EN1 for the power supply switching circuit; the drive circuit comprises a first input end, a second input end, a first output end and a second output end, the power supply switching circuit comprises a first input end, a second input end, a first output end and a second output end, the first output end and the second output end are connected with the grids of the PMOS transistor MP1 and the NMOS transistor MN1, the drains of the PMOS transistor MP1 and the NMOS transistor MN1 are connected with the pin LX, the source of the PMOS transistor MP1 is connected with the first output end of the power supply switching circuit, the second output end of the power supply switching circuit is connected with the power supply VDD, the power supply switching circuit comprises a first input end connected with the ground terminal GND and a second input end connected with the enable signal EN1, the inductor L is connected between the pin LX and the pin SOL, and the battery is connected between the pin SOL and the ground terminal GND.
The signal of the pin BAT and the signal of the pin SOL generate an enable signal EN1 through the solar charging control circuit, the output of the boost circuit is the same as the voltage of the power supply VDD under the normal work and no light control condition, and the output of the boost circuit is the same as the voltage of the ground terminal GND when the light control charging or the enabling is turned off.
That is, in the above embodiment, the enable signal EN1 and the voltage information of the ground GND determine the output of the battery adaptive solar light-controlled voltage boosting circuit; under the condition that the booster circuit works normally and no light control exists, the output of the booster circuit is the same as the voltage of the power supply VDD, and when the light control charging or the enabling is turned off, the output of the booster circuit is the same as the voltage of the ground end GND.
Referring to fig. 2, fig. 2 is a schematic diagram of a circuit for generating an enable signal EN1 according to an embodiment of the invention. As shown in fig. 2, the boost circuit includes a resistor R1, a resistor R2, a resistor R3, an operational amplifier and a MOS transistor MN0, the resistor R1, the resistor R2 and the resistor R3 are sequentially connected in series between the pin BAT and the ground terminal GND, the anode of the operational amplifier is connected to the pin SOL, the cathode of the operational amplifier is connected to the connection point of the resistor R1 and the resistor R2, the drain of the MOS transistor MN0 is connected to the connection point of the resistor R2 and the resistor R3, and the source of the MOS transistor MN0 is connected to the ground terminal GND; the gate of the MOS transistor MN0 is connected with the output end of the operational amplifier; the output terminal of the operational amplifier outputs the enable signal EN 1.
In embodiments of the present invention, as the illumination becomes stronger
Figure BDA0002612223260000071
When the enable signal EN1 is high, the light-operated signal is detected, the booster circuit can be controlled to be turned off, and the output power VDD is pulled to the ground end GND through the power supply switching circuit; as the illumination becomes weaker
Figure BDA0002612223260000072
When the enable signal EN1 is low, the light control signal is detected to be invalid, and the booster circuit and the output power supply VDD can be restored. In the circuit, a charge delay is made through the NMOS transistor MN0, so that the critical state encountered during solar charging and discharging is prevented.
Referring to fig. 3, fig. 3 is a schematic circuit diagram of a solar charging circuit according to an embodiment of the invention. As shown in the figure, the solar charging control circuit comprises a resistor R4, a resistor R5, an operational amplifier and a MOS transistor MP0, wherein the resistor R4 and the resistor R5 are sequentially connected in series between the pin SOL and the ground GND, the anode of the operational amplifier is connected to the pin BAT, the cathode of the operational amplifier is connected to the connection point of the resistor R4 and the resistor R5, the drain of the MOS transistor MP0 is connected to the pin SOL, and the source of the MOS transistor MP0 is connected to the pin BAT; the gate of the MOS transistor MP0 is connected to the output terminal of the operational amplifier.
In the embodiment of the invention, when
Figure BDA0002612223260000073
When the voltage of the gate of the PMOS transistor MP2 is low, the output information of the pin SOL charges the pin BAT; when in use
Figure BDA0002612223260000074
At this time, the gate voltage of the PMOS transistor MP2 is high, and the charging is ended.
It can be seen from the above that, through the above circuit, the level values of the pin BAT and the pin SOL can be detected, so as to obtain the result of whether the solar energy charges the battery, thereby implementing the solar charging management function.
Referring to fig. 1, as shown in the figure, the battery-adaptive solar photo-controlled boost circuit further includes a low battery shutdown circuit, the low battery shutdown circuit receives the pin BAT signal to generate a control signal CTL, and when the pin BAT signal indicates that the battery power is insufficient, the power supply switching circuit generates a shutdown signal; the signal of the pin LX, the enable signal EN1 and the control signal CTL generate the internal power supply pin VDD1 signal through the voltage boost circuit and supply the signal to the power supply switching circuit, so as to output the voltage of the power supply VDD or the voltage of the ground GND.
Referring to fig. 4 in conjunction with fig. 1, fig. 4 is a schematic diagram illustrating a low battery shutdown circuit according to an embodiment of the invention. The low battery power turn-off circuit comprises a resistor R8, a resistor R9, a resistor R10, a resistor R11, a MOS transistor 3, a MOS transistor 4 and a Schmitt trigger, wherein the resistor R8, the resistor R9 and the resistor R10 are sequentially connected between the pin BAT and the ground terminal GND in series, and the resistor R11 is connected with the internal power supply pin vdd1 and the input end of the Schmitt trigger; the grid electrode of the MOS transistor 3 is connected with the connection point of the resistor R8 and the resistor R9, the drain electrode is connected with the input end of the Schmitt trigger, and the source electrode is connected with the grounding end GND; the grid of the MOS transistor 4 is connected with the output end of the Schmitt trigger, the drain of the MOS transistor 4 is connected with the connection point of the resistor R9 and the resistor R10, and the source of the MOS transistor 4 is connected with the ground end GND; the output of the schmitt trigger outputs the control signal CTL.
The low-battery turn-off circuit in the above embodiment operates on the principle that the boost circuit and the power supply switching circuit are controlled by the control signal CTL output from the voltage at the detection pin BAT. As the power supplied by the battery is gradually increased,
Figure BDA0002612223260000081
VTH_MN3the voltage is the turn-on voltage of the NMOS transistor MN3, and the output control signal CTL at this time is low; as the battery operates, its supply voltage gradually decreases as
Figure BDA0002612223260000082
At this time, the control signal CTL output is high. Therefore, the voltage of the pin BAT is detected to control the booster circuit and the output voltage. When the battery electric quantity displayed by the pin BAT is insufficient, the battery self-adaptive solar light-controlled booster circuit is turned off.
Referring to fig. 5, fig. 5 is a schematic diagram illustrating a power supply switching circuit according to an embodiment of the invention. As shown, the power switching circuit includes a first switch key1, a second switch key2, a nor gate, and an inverter; two input ends of the nor gate are respectively connected with the enable signal EN1 and an enable signal EN2, the first switch key1 is connected between the internal power supply pin VDD1 and the power supply VDD signal, and the second switch key2 is connected between the ground terminal GND signal and the power supply VDD signal; the nor gate controls the conduction of the first switch key1, the inverter controls the conduction of the first switch key2, and the output VDD is switched to the ground GND signal when the enable signal EN1 and the enable signal EN2 are turned off.
The working principle of the circuit is that under the condition that the booster circuit works normally and no light control exists, the output power supply VDD voltage is the same as the voltage of the internal power supply pin VDD1, and when the light control is charged or the enable is turned off, the voltage of the ground end GND is output. The output voltage can be effectively cut off through the power supply switching circuit. Above-mentioned technical scheme has solved the problem of this light-operated product that steps up in the existing market well, and when light-operated charging, its output voltage equals with input voltage, and this when input voltage is greater than LED and switches on threshold voltage, can make LED thoroughly turn-off when being applied to LED relevant product and use.
In conclusion, the power supply switching circuit can effectively solve the problem of similar products in the market, not only expands the width in an application scene, but also reduces the power consumption of a chip.
The above description is only for the preferred embodiment of the present invention, and the embodiment is not intended to limit the scope of the present invention, so that all the equivalent structural changes made by using the contents of the description and the drawings of the present invention should be included in the scope of the present invention.

Claims (8)

1. A battery self-adaptive solar light-operated voltage boosting circuit is characterized by comprising a chip internal circuit and a peripheral circuit; the peripheral circuit comprises an inductor L, a solar panel solar, a battery and an output capacitor Cout; the chip internal circuit comprises a booster circuit, a solar charging control circuit, a PFM control circuit, a PMOS transistor MP1, a PMOS transistor MP2, an NMOS transistor MN1, a drive circuit and a power supply switching circuit; the solar panel solar is connected between a pin SOL and a ground terminal GND, the output capacitor Cout is connected between a power supply VDD and the ground terminal GND, the solar charging control circuit comprises a first input end, a second input end, a third input end, a first output end, a second output end and a third output end, the first input end and a source electrode of the PMOS transistor MP2 are connected with the pin BAT, the second input end and a drain electrode of the PMOS transistor MP2 are connected with the pin SOL, the third input end is connected with the PFM control circuit, the first output end is connected with a grid electrode of the PMOS transistor MP2, and the second output end and the third output end are respectively connected with the driving circuit and provide an enable signal EN1 for the power supply switching circuit; the driving circuit comprises a first input end, a second input end, a first output end and a second output end, the power supply switching circuit comprises a first input end, a second input end, a first output end and a second output end, the first output end and the second output end are connected with the grids of the PMOS transistor MP1 and the NMOS transistor MN1, the drains of the PMOS transistor MP1 and the NMOS transistor MN1 are connected with the pin LX, the source of the PMOS transistor MP1 is connected with the first output end of the power supply switching circuit, the second output end of the power supply switching circuit is connected with the power supply VDD, the power supply switching circuit comprises a first input end connected with the ground terminal GND and a second input end connected with the enable signal EN1, the inductor L is connected between the pin LX and the pin SOL, and the battery is connected between the pin SOL and the ground terminal GND;
the signal of the pin BAT and the signal of the pin SOL generate an enable signal EN1 through the solar charging control circuit, the output of the boost circuit is the same as the voltage of the power supply VDD under the normal work and no light control condition, and the output of the boost circuit is the same as the voltage of the ground terminal GND when the light control charging or the enabling is turned off.
2. The battery adaptive solar light-operated boost circuit of claim 1; the power supply switching circuit is characterized by further comprising an enabling circuit, wherein an input end of the enabling circuit receives a signal received by a pin EN and outputs an enabling signal EN2, and the power supply switching circuit further comprises a third input end, wherein the third input end receives an enabling signal EN2 and supplies the enabling signal EN and the ground end GND signal to the power supply switching circuit so as to output the voltage of the power supply VDD or the voltage of the ground end GND.
3. The battery adaptive solar light-operated boost circuit of claim 2; the power supply switching circuit is characterized by comprising a first switch key1, a second switch key2, a NOR gate and an inverter; two input ends of the nor gate are respectively connected with the enable signal EN1 and the enable signal EN2, the first switch key1 is connected between an internal power supply pin VDD1 and the power supply VDD signal, and the second switch key2 is connected between the ground terminal GND signal and the power supply VDD signal; the nor gate controls the conduction of the first switch key1, the inverter controls the conduction of the first switch key2, and the output VDD is switched to the ground GND signal when the enable signal EN1 and the enable signal EN2 are turned off.
4. The battery adaptive solar light-operated boost circuit of claim 1; the power supply switching circuit is characterized by further comprising a low battery power turn-off circuit, the power supply switching circuit further comprises a fourth input end, the low battery power turn-off circuit receives the pin BAT signal to generate a control signal CTL, the fourth input end receives the control signal CTL, and when the signal of the pin BAT shows that the battery power is insufficient, the power supply switching circuit generates a turn-off signal; the signal of the pin LX, the enable signal EN1 and the control signal CTL generate the internal power supply pin VDD1 signal through the voltage boosting circuit and supply the internal power supply pin VDD1 signal to the power supply switching circuit so as to output the power supply VDD signal.
5. The battery-adaptive solar light-operated boost circuit according to claim 4, wherein the battery low-power turn-off circuit comprises a resistor R8, a resistor R9, a resistor R10, a resistor R11, a MOS transistor 3, a MOS transistor 4 and a Schmitt trigger, wherein the resistor R8, the resistor R9 and the resistor R10 are sequentially connected in series between the pin BAT and the ground terminal GND, and the resistor R11 is connected with the internal power supply pin vdd1 and the input end of the Schmitt trigger; the grid electrode of the MOS transistor 3 is connected with the connection point of the resistor R8 and the resistor R9, the drain electrode is connected with the input end of the Schmitt trigger, and the source electrode is connected with the grounding end GND; the grid of the MOS transistor 4 is connected with the output end of the Schmitt trigger, the drain of the MOS transistor 4 is connected with the connection point of the resistor R9 and the resistor R10, and the source of the MOS transistor 4 is connected with the ground end GND; the output of the schmitt trigger outputs the control signal CTL.
6. The battery-adaptive solar light-operated boost circuit according to claim 5, wherein said MOS transistor 3 and said MOS transistor 4 are NMOS transistors.
7. The battery-adaptive solar light-operated boost circuit according to claim 1, wherein the boost circuit comprises a resistor R1, a resistor R2, a resistor R3, an operational amplifier and a MOS transistor MN0, wherein the resistor R1, the resistor R2 and the resistor R3 are sequentially connected in series between the pin BAT and the ground terminal GND, the positive electrode of the operational amplifier is connected to the pin SOL, the negative electrode of the operational amplifier is connected to the connection point of the resistor R1 and the resistor R2, the drain of the MOS transistor MN0 is connected to the connection point of the resistor R2 and the resistor R3, and the source of the MOS transistor MN0 is connected to the ground terminal GND; the gate of the MOS transistor MN0 is connected with the output end of the operational amplifier; the output terminal of the operational amplifier outputs the enable signal EN 1.
8. The battery-adaptive solar light-operated boost circuit according to claim 1, wherein the solar charge control circuit comprises a resistor R4, a resistor R5, an operational amplifier and a MOS transistor MP0, wherein the resistor R4 and the resistor R5 are sequentially connected in series between the pin SOL and the ground terminal GND, the anode of the operational amplifier is connected to the pin BAT, the cathode of the operational amplifier is connected to the connection point of the resistor R4 and the resistor R5, the drain of the MOS transistor MP0 is connected to the pin SOL, and the source of the MOS transistor MP0 is connected to the pin BAT; the gate of the MOS transistor MP0 is connected to the output terminal of the operational amplifier.
CN202010758019.8A 2020-07-31 2020-07-31 Battery self-adaptation solar light-operated boost circuit Pending CN111884322A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010758019.8A CN111884322A (en) 2020-07-31 2020-07-31 Battery self-adaptation solar light-operated boost circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010758019.8A CN111884322A (en) 2020-07-31 2020-07-31 Battery self-adaptation solar light-operated boost circuit

Publications (1)

Publication Number Publication Date
CN111884322A true CN111884322A (en) 2020-11-03

Family

ID=73204834

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010758019.8A Pending CN111884322A (en) 2020-07-31 2020-07-31 Battery self-adaptation solar light-operated boost circuit

Country Status (1)

Country Link
CN (1) CN111884322A (en)

Similar Documents

Publication Publication Date Title
CN103354685B (en) LED driving chip
CN102395235A (en) Energy saving lamp box control circuit and energy saving lamp box
WO2024027555A1 (en) Power supply circuit, display screen, and electronic device
CN102480819A (en) LED driving circuit
CN212519502U (en) Remote controller control circuit, circuit board and remote controller
CN202310230U (en) Energy saving light box control circuit and energy saving light box
CN212992001U (en) Light-operated boost circuit with turn-off function
CN102281683B (en) LED anti-flash circuit
WO2021258366A1 (en) Control circuit, battery management system and electrochemical device
CN108650738A (en) A kind of LED control circuit
CN111884323A (en) Low-power consumption solar light-operated boost circuit
CN213243577U (en) Input constant-current light-operated booster circuit
CN104869686A (en) Driving circuit and illuminating device comprising same
CN111884322A (en) Battery self-adaptation solar light-operated boost circuit
CN201622822U (en) Backlight regulating circuit
CN103369763A (en) LED signal lamp and driving circuit thereof
CN211352513U (en) Solar light-operated boosting LED functional circuit
CN213152423U (en) Circuit for deepening LED dimming depth and LED driving power supply
CN111404236B (en) Charging circuit of photovoltaic charging controller and photovoltaic charging controller
CN210202140U (en) LED induction lamp control circuit based on LED constant current driving power supply
CN210724292U (en) Lithium battery charger with multi-mode charging function
CN210202135U (en) Active consumption circuit with auxiliary winding control power supply
CN113489126A (en) High-efficient milliwatt level photovoltaic energy collection control circuit
CN107249235B (en) LED drive circuit compatible with indicator light switch
CN212969439U (en) Low-power-consumption circuit for quickly powering off chip in standby mode

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination