CN112271792A - Solar control circuit with low standby power consumption - Google Patents

Solar control circuit with low standby power consumption Download PDF

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Publication number
CN112271792A
CN112271792A CN202011246044.4A CN202011246044A CN112271792A CN 112271792 A CN112271792 A CN 112271792A CN 202011246044 A CN202011246044 A CN 202011246044A CN 112271792 A CN112271792 A CN 112271792A
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China
Prior art keywords
module
low standby
power consumption
standby power
control chip
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CN202011246044.4A
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CN112271792B (en
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班福奎
杨增卓
高峰
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Shanghai Shiningic Electronic Technology Co ltd
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Shanghai Shiningic Electronic Technology Co ltd
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    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
    • H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

A solar lawn lamp control circuit with low standby power consumption comprises: the low standby consumption control chip, the switch, the inductor, the rechargeable battery, the solar panel and the output capacitor. The solar LED lawn lamp has the characteristics of low standby power consumption and capability of realizing long-time standby when the battery power is lower than under-voltage locking under the condition of normal use by closing the switch; when the solar LED lawn lamp is not used for a long time, extremely low standby power consumption can be realized, and the normal charging function is not influenced. When the battery voltage is lower than the undervoltage locking threshold, even if the voltage of the battery at the light control end is lower than the light control enabling threshold, the pull-down resistor of the light control pin cannot form a discharging loop; the switch is connected in series at the inductor and the LX end of the switch port of the control chip for controlling the low standby consumption, so that the solar panel can be in standby for a long time, and the charging performance of the solar panel on the rechargeable battery is not influenced.

Description

Solar control circuit with low standby power consumption
Technical Field
The invention belongs to the technical field of lighting circuits, and relates to a solar control circuit with low standby power consumption.
Background
In recent years, the control chip and the scheme for controlling the solar lawn lamp with low standby power consumption have been widely developed and applied, so that the solar lawn lamp can be used in various environments and occasions while achieving the use of multiple functions and simultaneously achieving green and environment protection.
Referring to fig. 1 and 2, fig. 1 is a schematic diagram of a lawn lamp control circuit in the prior art. Fig. 2 is a schematic diagram of a discharge circuit of a solar lawn lamp control circuit in the prior art during standby. As shown in FIG. 1, the control chip 11 for controlling the low standby power consumption (indicated by the dashed square box) has 5 ports, a SOL terminal, a BAT terminal, an LX terminal, an output terminal VOUT, and a ground terminal GND. Wherein, the anode of the solar panel 17 is connected with the port SOL end of the control chip 11 for controlling the low standby power consumption, and the cathode of the solar panel 17 is connected with the ground; the positive pole of the rechargeable battery 14 is connected to the BAT port of the control chip 11 for controlling the low standby power consumption, and the negative pole is connected to the ground; the inductor 13 is connected between BAT and LX ports of the control chip for controlling the low standby power consumption; the output capacitor 15 is connected between the output terminal VOUT of the control chip 11 for controlling the low standby power consumption and the ground; the anode of the LED lawn lamp 16 is connected to the output terminal VOUT of the control chip 11 for controlling the low standby power consumption, and the cathode is connected to the ground; the switch 12 is connected between the ground GND of the control chip 11 that controls the low standby power consumption and ground.
More specifically, the control chip 11 for controlling the low standby power consumption may include: the control and drive module 21, the charging PMOS tube 22, the switch NMOS tube 23, the follow current PMOS tube 24 and the pull-down resistor 25 of the SOL port; the substrates of the charging PMOS tube 22 and the freewheeling PMOS tube 24 are both connected to the output terminal VOUT. The working power supply of the control and driving module 21 is the output terminal VOUT, and the pull-down resistor 25 is used to eliminate the light-operated interference of weak light to the SOL pin.
Further, the control and drive module 21 includes: a pulse frequency modulator 31, a comparison and logic module 32 and a driving module 33.
When the voltage at the SOL end is higher than 0.4V, the control and drive module 21 outputs a low level signal to the gate of the switch NMOS transistor 23 to turn off the channel thereof, and outputs a low level signal to the gate of the freewheeling PMOS transistor 24 to turn on the channel thereof; when the voltage at the SOL end is lower than 0.4V and BAT is higher than the undervoltage locking threshold value of 0.9V, the control and drive module 21 outputs a pulse frequency modulation signal to the grid of the switch NMOS tube 23 to switch the switch NMOS tube, outputs a pulse frequency modulation signal to the grid of the freewheeling PMOS tube 24 to switch the freewheeling PMOS tube 24, and switches on and off the switch NMOS tube 23 and the freewheeling PMOS tube 24 are reversed, so that the voltage boosting from the rechargeable battery 14 to the output terminal VOUT end through the inductor 13 and the freewheeling PMOS tube 24 is realized, and the voltage is boosted to the LED lawn lamp 16 to be switched on and balanced.
The rechargeable battery 14 is a nickel-metal hydride battery, the typical voltage value of the rechargeable battery is 1.2V, when the rechargeable battery is discharged to a lower voltage value, BAT is less than 0.9V and SOL is less than 0.4V, the channel of the follow current PMOS transistor is turned off, the output terminal VOUT is lower than BAT by a diode voltage drop value, the grid of the charging PMOS transistor 22 cannot be pulled up to the voltage value of BAT and is lower than BAT by a diode voltage drop value, the charging PMOS transistor 22 is turned on, the rechargeable battery 14 has a discharge current loop to the ground through the channel of the charging PMOS transistor 22 and the pull-down resistor 25, and the common value of the pull-down resistor 25 is 25K ohms, so the discharge loop is about 36uA, the standby power consumption is high, and the long-time standby of the battery is not beneficial to connection.
Referring to fig. 3, fig. 3 is a schematic diagram of a charging circuit of a solar lawn lamp control circuit in the prior art during standby. In order to turn off the discharging circuit and solve the long-time standby problem, the switch 12 is usually added in the industry, and the switch 12 between the ground GND of the control chip 11 controlling the low standby power consumption and the ground is selectively turned off, however, as shown in fig. 3, when the SOL voltage is higher than BAT, the charging circuit controls the ground GND of the control chip controlling the low standby power consumption to be floating, the channel of the charging PMOS transistor is turned off with high resistance, and the charging path is from the charging SOL port to the BAT port through the high resistance channel of the charging PMOS transistor 22 by the solar panel 17, so that the charging capability is very weak.
Disclosure of Invention
In order to solve the technical problem, the invention provides a brand-new solar lawn lamp control circuit with low standby power consumption and a method thereof, which support that when the voltage of a battery is lower than an undervoltage locking threshold value, even if the voltage of a battery at a light-control end is lower than a light-control enabling threshold value, a pull-down resistor of a light-control pin cannot form a discharge loop; the switch is connected in series at the inductor and the LX end of the switch port of the control chip for controlling the low standby consumption, so that the solar panel can be in standby for a long time, and the charging performance of the solar panel on the rechargeable battery is not influenced.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a solar lawn lamp control circuit with low standby power consumption comprises: the low standby consumption control chip controls the low standby consumption control chip, the inductor, the rechargeable battery, the solar panel and the output capacitor; the lawn lamp is connected between the output end VOUT and the ground end GND; the control chip with low standby consumption comprises an SOL end, a BAT end, an LX end, an output end VOUT and a ground end GND; wherein the content of the first and second substances,
the LX end of the control chip with low standby power consumption is connected to one end of the inductor, the other end of the inductor is connected to the BAT end of the control chip with low standby power consumption, the BAT end is also connected to the positive electrode of the rechargeable battery, and the negative electrode of the rechargeable battery is connected to the ground; the SOL end of the control chip with low standby power consumption is connected to the anode of the solar panel, and the cathode of the solar panel is connected to the ground; the VOUT end of the control chip with low standby power consumption is connected to the anode of the output capacitor and the anode of the LED lawn lamp, and the cathode of the output capacitor and the cathode of the LED lawn lamp are connected to the ground; the GND end of the control chip with low standby power consumption is connected to the ground;
the control chip with low standby power consumption comprises a charging module, a boosting module, a bias current module, an under-voltage locking module and a pull-down resistor, wherein the charging module is used for entering a charging mode after detecting that the SOL end and the BAT end of the control chip with low standby power consumption meet charging conditions; the input end of the charging module is connected with the SOL end, and the output end of the charging module is connected with the BAT and the input end VSUB of the bias current module; the input end of the boost module is connected with an enable EN end, an SOL end and an LX end, the output end of the boost module is connected with an output end VOUT, and the boost module is used for entering a boost mode after meeting a boost condition and adjusting the switching frequency according to the voltage of the LX end and the VOUT end of the control chip with low standby power consumption; the bias current module is used for generating bias current, and the under-voltage locking module is used for detecting that the voltage of a BAT end of the low-standby-consumption control chip is under-voltage or the voltage of a VOUT end of the low-standby-consumption control chip is lower than the BAT end, and the working power supply of the under-voltage locking module 204 is VOUT; the pull-down resistor is connected between the SOL and a ground end GND in series; the charging condition of the charging module is that a working power supply is higher in voltage value of an SOL end and a BAT port, and the boosting condition is that the BAT end of the control chip with low standby power consumption is locked under voltage or the SOL port is enabled by light control.
Further, the charging module comprises a substrate selection module, a comparator and a charging P tube; the input end of the substrate selection module is connected with the SOL end and the BAT end, and the output end of the substrate selection module is connected with the input end VSUB of the bias current module; the input end of the comparator is connected with the SOL end and the BAT end, and the output end of the comparator is connected with the grid electrode of the charging P tube 22; the substrate of the charging P tube is connected to the input end VSUB of the bias current module, the source electrode of the charging P tube is connected to the SOL, and the drain electrode of the charging P tube is connected to the BAT end.
Further, the bias current module provides a working tail current for the charging module, the boosting module, the bias current module and the under-voltage locking module, a working power supply of the bias current module is an output signal VSUB of the substrate selection module, and the signal VSUB is a signal output by high-voltage devices at the SOL end and the BAT end of the low standby consumption control chip.
Furthermore, the boosting module comprises a logic and driving module, a pulse frequency modulation module, a switch N tube and a follow current P tube; the input end of the logic and drive module is connected with an enabling EN end, an SOL end and the output end of the pulse frequency modulation module, and the output end of the logic and drive module is connected with a switch N tube and a follow current P tube; the source electrode and the substrate of the switch N tube are connected to a ground GND end, and the drain electrode of the switch N tube is connected to an LX end; the source electrode and the substrate of the follow current P pipe are connected to the output end VOUT, and the drain electrode of the follow current P pipe is connected to the LX end.
Further, when the under-voltage locking module detects that the BAT end of the chip is under-voltage or the VOUT end voltage is lower than the BAT end, the P tube is normally turned on, and the N tube is turned off.
Further, the solar control circuit with low standby power consumption further comprises a switch, wherein the LX terminal of the control chip with low standby power consumption is connected to one end of the switch, and the other end of the switch is connected to one end of the inductor; when the switch is turned off, the voltage of the output terminal VOUT is zero.
According to the technical scheme, the solar control circuit with low standby power consumption can effectively solve the problem that the solar lawn lamp can be in standby for a long time, and meanwhile, the charging performance of the solar panel on the rechargeable battery is not influenced.
Drawings
FIG. 1 is a schematic diagram of a prior art lawn lamp control circuit
FIG. 2 is a schematic diagram of a discharge circuit of a solar lawn lamp control circuit in standby state in the prior art
FIG. 3 is a schematic diagram of a charging circuit of a solar lawn lamp control circuit in standby state in the prior art
FIG. 4 is a schematic diagram of a solar lawn lamp control circuit with low standby power consumption according to an embodiment of the present invention
FIG. 5 is a schematic diagram of a charging loop during charging with low standby power consumption when the switch is turned off according to an embodiment of the present invention
Description of the element reference numerals
11 prior art control chip
12 switch
13 inductor
14 rechargeable battery
15 output capacitance
16 LED lawn lamp
17 solar panel
21 prior art control and drive module
22 charging P tube
23 switch N tube
24-follow P pipe
25 pull-down resistor
31 pulse frequency modulation module
32 compare and logic module
33 drive module
101 control chip with low standby power consumption of the invention
201 charging module
202 boost module
203 bias current module
204 under-voltage locking module
301 comparator
302 substrate selection module
401 logic and driver module
402 pulse frequency modulation module
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 solar control circuit with low standby power consumption of the present invention realizes the long-time standby of the solar lawn lamp without affecting the charging performance of the solar panel to the rechargeable battery under the following two conditions, and the two schemes are realized by a switch connected in series between the LX terminal of the control chip with low standby power consumption and the inductor, that is:
under the condition that the switch is turned off, the solar LED lawn lamp has the characteristic of low standby power consumption when the battery power is lower than under-voltage locking under the normal use condition, and long-time standby can be realized.
Concretely, a solar energy lawn lamp control circuit of low standby power consumption, characterized by includes: the low standby consumption control chip controls the low standby consumption control chip, the inductor, the rechargeable battery, the solar panel and the output capacitor; the lawn lamp is connected between the output end VOUT and the ground end GND; the control chip with low standby consumption comprises an SOL end, a BAT end, an LX end, an output end VOUT and a ground end GND; wherein the content of the first and second substances,
the LX end of the control chip with low standby power consumption is connected to one end of the inductor, the other end of the inductor is connected to the BAT end of the control chip with low standby power consumption, the BAT end is also connected to the positive electrode of the rechargeable battery, and the negative electrode of the rechargeable battery is connected to the ground; the SOL end of the control chip with low standby power consumption is connected to the anode of the solar panel, and the cathode of the solar panel is connected to the ground; the VOUT end of the control chip with low standby power consumption is connected to the anode of the output capacitor and the anode of the LED lawn lamp, and the cathode of the output capacitor and the cathode of the LED lawn lamp are connected to the ground; the GND end of the control chip with low standby power consumption is connected to the ground;
the control chip with low standby power consumption comprises a charging module, a boosting module, a bias current module, an under-voltage locking module and a pull-down resistor, wherein the charging module is used for entering a charging mode after detecting that the SOL end and the BAT end of the control chip with low standby power consumption meet charging conditions; the input end of the charging module is connected with the SOL end, and the output end of the charging module is connected with the BAT and the input end VSUB of the bias current module; the input end of the boost module is connected with an enable EN end, an SOL end and an LX end, the output end of the boost module is connected with an output end VOUT, and the boost module is used for entering a boost mode after meeting a boost condition and adjusting the switching frequency according to the voltage of the LX end and the VOUT end of the control chip with low standby power consumption; the bias current module is used for generating bias current, and the under-voltage locking module is used for detecting that the voltage of a BAT end of the low standby power consumption control chip is under-voltage or the voltage of a VOUT end of the low standby power consumption control chip is lower than the BAT end, and the working power supply of the under-voltage locking module is VOUT; the pull-down resistor is connected between the SOL and a ground end GND in series; the charging condition of the charging module is that a working power supply is higher in voltage value of an SOL end and a BAT port, and the boosting condition is that the BAT end of the control chip with low standby power consumption is locked under voltage or the SOL port is enabled by light control.
Secondly, under the condition that the switch is disconnected, namely when the solar LED lawn lamp is not used for a long time, a switch is connected in series between the inductor and the control chip LX switch pin for controlling the low standby power consumption and is opened, so that extremely low standby power consumption can be realized, and the normal charging function is not influenced.
The working principle of the solar lawn lamp control circuit with low standby power consumption is described below by an embodiment.
Referring to fig. 4, fig. 4 is a schematic diagram of a solar lawn lamp control circuit with low standby power consumption according to an embodiment of the present invention. As shown in fig. 4, the solar lawn lamp control circuit with low standby power consumption includes a control chip 101, a switch 12, an inductor 13, a rechargeable battery 14, an output capacitor 15, an LED lawn lamp 16, and a solar panel 17; the LX terminal of the chip 101 is connected to the switch 12, the other terminal of the switch 12 is connected to the inductor 13, the other terminal of the inductor 13 is connected to the BAT terminal of the chip 101, the BAT terminal is also connected to the positive electrode of the rechargeable battery 14, and the negative electrode of the rechargeable battery 14 is connected to the ground; the SOL terminal of the chip 101 is connected to the anode of the solar panel 17, and the cathode of the solar panel 17 is connected to the ground; the VOUT end of the chip 101 is connected to the positive electrode of the output capacitor 15 and the anode of the LED lawn lamp 16, and the negative electrode of the output capacitor 15 and the cathode of the LED lawn lamp 16 are connected to the ground; the GND terminal of the chip 101 is connected to ground.
The chip-making sheet 101 includes: the charging module 201, the boosting module 202, the bias current module 203, the under-voltage locking module 204 and the pull-down resistor 25; the 5 ports are SOL, BAT, LX, VOUT and GND; the input signal of the charging module 201 is SOL, and the output signals are BAT and VSUB; the input signals of the boost module 202 are EN, SOL and LX, and the output signal is VOUT; a pull-down resistor 25 is connected in series between SOL and GND.
More specifically, the charging module 201 includes: a comparator 301, a substrate selection module 302, a charging P tube 22; the input signals of the substrate selection module 302 are SOL and BAT, and the output signal is VSUB; the input signals of the comparator 301 are SOL and BAT, and the output signal is connected to the grid of the charging P tube 22; the substrate of charge P-tube 22 is connected to the VSUB signal, the source is connected to SOL, and the drain is connected to BAT.
The charging module 201 is configured to enter a charging mode after detecting that the SOL and BAT ports of the chip 101 meet a charging condition; the working power of the charging module 201 is the higher voltage of the SOL and BAT ports.
More specifically, the boost module 202 includes: a logic and driving module 401, a pulse frequency modulation module 402, a switch N tube 23 and a follow current P tube 24; the input signals of the logic and drive module 401 are the output signals of the EN, SOL and pulse frequency modulation module 402, and the output signal of the logic and drive module 401 is connected to the switch N tube 23 and the follow current P tube 24; the source and the substrate of the switch N tube 23 are connected to GND, and the drain is connected to LX; the source electrode and the substrate of the follow current P tube are connected to VOUT, and the drain electrode is connected to LX;
the boost module 202 is used for entering a boost mode after the boost condition is met, and adjusting the switching frequency according to the voltage of the LX and VOUT ports of the chip 101 to realize boost output; when the BAT port of the chip 101 is locked under voltage or the SOL port is enabled by light control, the freewheeling P pipe 24 between the LX port and the VOUT port is normally open; the operating power supply of the boost module 202 is VOUT.
The bias current module 203 is used for generating bias current and providing work tail current for other modules; the working power supply of the bias current module 203 is the output signal VSUB of the substrate selection module 302, i.e. the voltage of the SOL and BAT ports of the chip 101 is high;
the undervoltage locking module 204 is used for detecting undervoltage of a BAT port of the chip 101 or switching on the P tube 24 when the voltage of VOUT end is lower than that of the BAT end, and simultaneously switching off the N tube 23; the operating power supply of the under-voltage lockout module 204 is VOUT.
As shown in fig. 4, when the switch 12 is always closed or the BAT and LX ports of the chip 101 are directly connected through the inductor, and when the voltage at the SOL end is higher than 0.4V, the voltage boost module 202 outputs a low level signal to the gate of the switch N transistor 23 to turn off the switch, and outputs a low level signal to the gate of the freewheeling P transistor 24 to turn on the switch; when the voltage at the SOL end is lower than 0.4V and BAT is higher than the undervoltage locking threshold value by 0.9V, the logic and drive module 401 outputs a pulse frequency modulation signal to the grid electrode of the switch N tube 23 to enable the switch of the switch N tube, outputs a pulse frequency modulation signal to the grid electrode of the follow current P tube to enable the switch of the follow current P tube, and the switch N tube 23 and the follow current P tube 24 are switched on and off in a mutual reverse manner, so that the voltage boosting of the rechargeable battery 14 to the VOUT end through the inductor 13 and the follow current P tube 24 is realized, and the voltage is boosted to the conduction of the LED lawn lamp 16 and reaches; the rechargeable battery 17 is a nickel-metal hydride battery, the typical voltage value of the rechargeable battery is 1.2V, when the rechargeable battery is discharged to a lower voltage value, BAT is less than 0.9V and SOL is less than 0.4V, the working power supply of the charging module 201 is selected to be BAT voltage by the substrate selection module 302, the grid electrode of the charging P tube 22 is pulled up to the BAT voltage value, the charging P tube is turned off, the rechargeable battery 14 has no discharging current loop to the ground through the charging P tube 22 and the pull-down resistor 25, meanwhile, the freewheeling P tube 24 is turned on, VOUT is equal to the BAT voltage value, the working power supply VOUT of the boosting module 202 is equal to the BAT voltage value, no switching frequency is increased, VOUT is lower than the LED starting voltage, low standby power consumption is achieved, and the.
Referring to fig. 5, fig. 5 is a schematic diagram of a charging loop during charging with low standby power consumption when a switch is turned off according to an embodiment of the present invention. As shown in fig. 5, when the battery is connected and the lighting function is not needed, the inductor 13 and the LX port of the chip 101 are connected in series with a switch 12 to turn off, so VOUT voltage is zero, in this case, only the charging module 201 and the bias current module 203 operate, the standby power consumption is very low, when the SOL voltage is higher than BAT, the charging circuit is as shown in fig. 5, the channel of the charging P-tube 22 is on, the charging path is from the SOL port of the chip 101 to the BAT port of the chip 101 through the on channel of the charging P-tube 22 by the solar panel 17, and the charging circuit operates normally.
In summary, the power supply switching circuit of the invention can effectively solve the problem encountered by similar products in the market, not only expands the width in the application scene, but also reduces the power consumption of the control chip with low standby power consumption.
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 (6)

1. A solar lawn lamp control circuit with low standby power consumption is characterized by comprising: the low standby consumption control chip controls the low standby consumption control chip, the inductor, the rechargeable battery, the solar panel and the output capacitor; the lawn lamp is connected between the output end VOUT and the ground end GND; the control chip with low standby consumption comprises an SOL end, a BAT end, an LX end, an output end VOUT and a ground end GND; wherein the content of the first and second substances,
the LX end of the control chip with low standby power consumption is connected to one end of the inductor, the other end of the inductor is connected to the BAT end of the control chip with low standby power consumption, the BAT end is also connected to the positive electrode of the rechargeable battery, and the negative electrode of the rechargeable battery is connected to the ground; the SOL end of the control chip with low standby power consumption is connected to the anode of the solar panel, and the cathode of the solar panel is connected to the ground; the VOUT end of the control chip with low standby power consumption is connected to the anode of the output capacitor and the anode of the LED lawn lamp, and the cathode of the output capacitor and the cathode of the LED lawn lamp are connected to the ground; the GND end of the control chip with low standby power consumption is connected to the ground;
the control chip with low standby power consumption comprises a charging module, a boosting module, a bias current module, an under-voltage locking module and a pull-down resistor, wherein the charging module is used for entering a charging mode after detecting that the SOL end and the BAT end of the control chip with low standby power consumption meet charging conditions; the input end of the charging module is connected with the SOL end, and the output end of the charging module is connected with the BAT and the input end VSUB of the bias current module; the input end of the boost module is connected with an enable EN end, an SOL end and an LX end, the output end of the boost module is connected with an output end VOUT, and the boost module is used for entering a boost mode after meeting a boost condition and adjusting the switching frequency according to the voltage of the LX end and the VOUT end of the control chip with low standby power consumption; the bias current module is used for generating bias current, and the under-voltage locking module is used for detecting that the voltage of a BAT end of the low-standby-consumption control chip is under-voltage or the voltage of a VOUT end of the low-standby-consumption control chip is lower than the BAT end, and the working power supply of the under-voltage locking module 204 is VOUT; the pull-down resistor is connected between the SOL and a ground end GND in series; the charging condition of the charging module is that a working power supply is higher in voltage value of an SOL end and a BAT port, and the boosting condition is that the BAT end of the control chip with low standby power consumption is locked under voltage or the SOL port is enabled by light control.
2. The low standby power consumption solar control circuit of claim 1; the charging module is characterized by comprising a substrate selection module, a comparator and a charging P tube; the input end of the substrate selection module is connected with the SOL end and the BAT end, and the output end of the substrate selection module is connected with the input end VSUB of the bias current module; the input end of the comparator is connected with the SOL end and the BAT end, and the output end of the comparator is connected with the grid electrode of the charging P tube 22; the substrate of the charging P tube is connected to the input end VSUB of the bias current module, the source electrode of the charging P tube is connected to the SOL, and the drain electrode of the charging P tube is connected to the BAT end.
3. The low standby power consumption solar control circuit of claim 2; the low standby consumption control chip is characterized in that the bias current module provides working tail current for the charging module, the boosting module, the bias current module and the undervoltage locking module, a working power supply of the bias current module is an output signal VSUB of the substrate selection module, and the signal VSUB is a signal output by a high voltage device of the SOL end and the BAT end of the low standby consumption control chip.
4. The low standby power consumption solar control circuit of claim 1; the boost circuit is characterized in that the boost module comprises a logic and driving module, a pulse frequency modulation module, a switch N tube and a follow current P tube; the input end of the logic and drive module is connected with an enabling EN end, an SOL end and the output end of the pulse frequency modulation module, and the output end of the logic and drive module is connected with a switch N tube and a follow current P tube; the source electrode and the substrate of the switch N tube are connected to a ground GND end, and the drain electrode of the switch N tube is connected to an LX end; the source electrode and the substrate of the follow current P pipe are connected to the output end VOUT, and the drain electrode of the follow current P pipe is connected to the LX end.
5. The low standby power consumption solar control circuit of claim 4; the undervoltage locking module is characterized in that when detecting the BAT end undervoltage or VOUT end voltage of the chip is lower than the BAT end, the current P tube is normally turned on, and the switch N tube is turned off.
6. The solar control circuit with low standby power consumption according to any one of claims 1 to 5, further comprising a switch, wherein the LX terminal of the control chip with low standby power consumption is connected to one terminal of the switch, and the other terminal of the switch is connected to one terminal of the inductor; when the switch is turned off, the voltage of the output terminal VOUT is zero.
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