Light-emitting diode (LED) bulb circuit capable of being charged after light is turned off

Abstract

The utility model discloses a light-off charging LED bulb circuit comprising a live wire input end L, a zero line input end N, a safety circuit F1, a lightning protection surge circuit, a rectification circuit, a filtering circuit, an LED constant current IC internal control circuit, a constant current IC no-load control circuit, an output current adjusting circuit, an AC input detection circuit, a transformer output power supply circuit and a charging and discharging control circuit. According to the utility model, a plurality of LED emergency lamps are connected in parallel on the same line, the system has the functions of automatic identification of mixed connection of null lines and live lines, accurate AC impedance input detection and perfect battery protection and management, the actual use voltage range is wide AC85-265V, global use can be realized, and the system can be widely applied to the fields of power supply, power supply and the like. The circuit has an emergency three-level dimming function, IC peripheral auxiliary components are reduced, the design is simpler and more convenient, the cost is lower, and the performance is more stable. Operation is convenient, and production efficiency is improved. Operation is convenient, and production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lighting equipment, in particular to a light-off charging LED bulb circuit. Background Art

[0002] LED (light-emitting diode) lighting has been widely used, bringing great energy-saving contributions to society. At present, there are still many countries or regions with backward economic conditions that often experience power outages, so LED emergency lighting bulbs are very suitable for these environments. Conventional LED emergency bulb circuits are charged under normal lighting conditions. Now we have developed an LED bulb circuit that charges when the lights are turned off. Ensure that the charging state is turned off when there is AC input. This circuit has a simple structure, few devices around the IC, simple production, and an emergency three-level dimming function. Improve the cost-effectiveness of the product and enhance market competitiveness. Utility Model Content

[0003] The purpose of the utility model is to provide a LED bulb circuit for charging with the light off, so as to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a light-off charging LED bulb circuit, comprising a live input terminal L, a neutral input terminal N, a fuse circuit F1, a lightning surge protection circuit, a rectifier circuit, a filter circuit, an LED constant current IC internal control circuit, a constant current IC no-load control circuit, an output current regulation circuit, an AC input detection circuit, a transformer output power supply circuit and a charge and discharge control circuit, wherein the live input terminal L is connected to one end of the lightning surge protection circuit through the fuse circuit F1, the neutral input terminal N is connected to the other end of the lightning surge protection circuit, the rectifier circuit is respectively connected to the lightning surge protection circuit, the filter circuit and the AC input detection circuit, the LED constant current IC internal control circuit is respectively connected to the filter circuit, the constant current IC no-load control circuit, the output current regulation circuit and the transformer output power supply circuit, and the charge and discharge control circuit is respectively connected to the constant current IC no-load control circuit, the transformer output power supply circuit and the AC input detection circuit;

[0005] The charge and discharge control circuit includes a power supply rectification and filtering circuit, a charging indication circuit, an emergency main IC internal control circuit, a battery management circuit, an output control circuit and an LED working circuit; the emergency main IC internal control circuit is respectively connected to the transformer output power supply circuit, the power supply rectification and filtering circuit, the charging indication circuit, the battery management circuit, the output control circuit and the LED working circuit.

[0006] The internal control circuit of the emergency main IC includes an emergency detection control chip IC, the power supply rectification and filtering circuit includes a capacitor C2, a resistor R6 and a diode D1, the charging indication circuit includes an LED1 lamp bead and an LED2 lamp bead, the battery management circuit includes a capacitor C3 and a battery pack BAT, the output control circuit includes a resistor R7, and the LED working circuit includes an LED+ lamp bead string and an LED- lamp bead string.

[0007] Preferably: the lightning protection surge circuit includes a varistor RV1, the rectifier circuit includes a rectifier bridge DB1, a varistor RV1 is connected between the live wire input terminal L and the neutral wire input terminal N, one end of the fuse circuit F1 is electrically connected to the live wire input terminal L, the other end of the fuse circuit F1 is respectively connected to one end of the varistor RV1 and pin 4 of the rectifier bridge DB1, pin 1 of the rectifier bridge DB1 is electrically connected to the neutral wire input terminal N, the filter circuit includes a capacitor C1, pin 3 of the rectifier bridge DB1 of the rectifier circuit is connected to the positive electrode of the capacitor C1, the LED constant current IC internal control circuit includes a constant current IC, the output current regulation circuit includes a resistor R1, the transformer output power supply circuit includes a transformer T1, and the AC input detection circuit includes a resistor R4 and a resistor R5.

[0008] Preferably: the emergency detection control chip IC includes VN pin 1, NC pins 2, 3, 6, 13, EN pin 4, BATP pin 5, CHRG pin 7, GND pin 8, LED1 pin 9, PROG pin 10, LED2 pin 11, VDD pin 12 and VL pin 14, the pin number of the VN pin is 1; the pin numbers of the NC pins are 2, 3, 6, 13 respectively; the pin number of the EN pin is 4; the pin number of the BATP pin is 5; the pin number of the CHRG pin is 7; the pin number of the GND pin is 8; the pin number of the LED1 pin is 9; the pin number of the PROG pin is 10; the pin number of the LED2 pin is 11; the pin number of the VDD pin is 12 and the pin number of the VL pin is 14.

[0009] Preferably: the 4th pin of the constant current IC is respectively connected to the 3rd pin of the rectifier bridge DB1 and the capacitor C1, the 2nd pin of the constant current IC is connected to one end of the low voltage pin of the transformer T1 and one end of the diode D1 through the resistor R2, the 5th and 6th pins of the constant current IC are connected to one end of the high voltage pin of the transformer T1, the 7th pin of the constant current IC is connected to one end of the resistor R1, the 2nd pin of the constant current IC is connected to the 7th pin of the emergency detection control chip IC, the 1st pin of the emergency detection control chip IC is respectively connected to one end of the varistor RV1, one end of the insurance circuit F1 and the 4th pin of the rectifier bridge DB1 through the resistor R4, the 4th pin of the emergency detection control chip IC is connected to the LED+ lamp bead string and the LED- lamp bead string through the resistor R7, the 5th pin of the emergency detection control chip IC is respectively connected to the capacitor C3 and one end of the battery pack BAT, the 9th pin of the emergency detection control chip IC is connected to One end of the LED1 lamp bead is connected, and the other end of the LED1 lamp bead is respectively connected to one end of the resistor R6 and the LED2 lamp bead, the 10th pin of the emergency detection control chip IC is connected to one end of the resistor R3, and the 12th pin of the emergency detection control chip IC is respectively connected to the other end of the diode D1, the positive electrode of the capacitor C2 and the other end of the resistor R6, and the 14th pin of the emergency detection control chip IC is respectively connected to the 1st pin of the rectifier bridge stack DB1 and the neutral line input terminal N through the resistor R5, and the 2nd pin of the rectifier bridge stack DB1 is electrically connected to the other end of the capacitor C1, the other end of the 1st pin of the constant current IC, the other end of the resistor R1, the other end of the high and low voltage pins of the transformer T1, the other end of the capacitor C2, the other end of the resistor R3, the other end of the LED2 lamp bead, the 8th pin of the emergency detection control chip IC, the capacitor C3, the other end of the battery pack BAT and the other end of the LED+ lamp bead string and the LED- lamp bead string.

[0010] Preferably, the fuse circuit F1 is a fuse / PTC thermistor.

[0011] Preferably: the model of the emergency detection control chip IC is IC2893.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The utility model connects multiple LED emergency lights in parallel on the same circuit, and has the function of automatic identification of mixed connection of neutral and live wires.

[0014] 2. Accurate AC impedance input detection.

[0015] 3. Complete battery protection and management.

[0016] 4. The actual voltage range is wide, AC85-265V, and can be used worldwide.

[0017] 5. This line has emergency three-level dimming function.

[0018] 6. Reduce IC peripheral auxiliary components to make the design simpler, the cost lower, and the performance more stable. The operation is simple and the production efficiency is improved. The operation is simple and the production efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the circuit principle diagram of the utility model;

[0020] Figure 2 This is the pin distribution diagram of the LED constant current driver chip IC of the utility model;

[0021] Figure 3 This is the internal block diagram of the LED constant current driver IC of the utility model;

[0022] Figure 4 This is the electrical principle framework diagram of the utility model;

[0023] Figure 5 This is a schematic diagram of the top layer of the PCB board of the utility model;

[0024] Figure 6 This is a schematic diagram of the bottom layer of the PCB board of the present utility model. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Example

[0027] See also Figure 1-Figure 6 The utility model provides a technical solution: a light-off charging LED bulb circuit, including a live input terminal L, a neutral input terminal N, a fuse circuit F1, a lightning surge protection circuit, a rectifier circuit, a filter circuit, an LED constant current IC internal control circuit, a constant current IC no-load control circuit, an output current regulation circuit, an AC input detection circuit, a transformer output power supply circuit and a charge and discharge control circuit, wherein the live input terminal L is connected to one end of the lightning surge protection circuit through the fuse circuit F1, the neutral input terminal N is connected to the other end of the lightning surge protection circuit, the rectifier circuit is respectively connected to the lightning surge protection circuit, the filter circuit and the AC input detection circuit, the LED constant current IC internal control circuit is respectively connected to the filter circuit, the constant current IC no-load control circuit, the output current regulation circuit and the transformer output power supply circuit, and the charge and discharge control circuit is respectively connected to the constant current IC no-load control circuit, the transformer output power supply circuit and the AC input detection circuit;

[0028] The charge and discharge control circuit includes a power supply rectification and filtering circuit, a charging indication circuit, an emergency main IC internal control circuit, a battery management circuit, an output control circuit and an LED working circuit; the emergency main IC internal control circuit is respectively connected to the transformer output power supply circuit, the power supply rectification and filtering circuit, the charging indication circuit, the battery management circuit, the output control circuit and the LED working circuit.

[0029] The internal control circuit of the emergency main IC includes an emergency detection control chip IC, the power supply rectification and filtering circuit includes a capacitor C2, a resistor R6 and a diode D1, the charging indication circuit includes an LED1 lamp bead and an LED2 lamp bead, the battery management circuit includes a capacitor C3 and a battery pack BAT, the output control circuit includes a resistor R7, and the LED working circuit includes an LED+ lamp bead string and an LED- lamp bead string.

[0030] Features

[0031] (1) AC leakage emergency start function;

[0032] (2) Extremely simple peripheral application circuit;

[0033] (3) Accurate AC impedance input detection;

[0034] (4) Complete battery protection and management;

[0035] (5) EN directly drives the LED load;

[0036] (6) Charging status indication;

[0037] (7) No need to distinguish between neutral and live wires;

[0038] (8) Applicable to the full range of input voltage from 85Vac to 265Vac;

[0039] (9) It has three-speed emergency dimming function;

[0040] (10) Use 14-pin SOP-14 package.

[0041] In this embodiment, specifically: the lightning protection surge circuit includes a varistor RV1, the rectifier circuit includes a rectifier bridge DB1, the varistor RV1 is connected between the live input terminal L and the neutral input terminal N, one end of the fuse circuit F1 is electrically connected to the live input terminal L, the other end of the fuse circuit F1 is respectively connected to one end of the varistor RV1 and pin 4 of the rectifier bridge DB1, pin 1 of the rectifier bridge DB1 is electrically connected to the neutral input terminal N, the filter circuit includes a capacitor C1, pin 3 of the rectifier bridge DB1 of the rectifier circuit is connected to the positive electrode of the capacitor C1, the internal control circuit of the LED constant current IC includes a constant current IC, the output current regulation circuit includes a resistor R1, the transformer output power supply circuit includes a transformer T1, and the AC input detection circuit includes a resistor R4 and a resistor R5.

[0042] In this embodiment, specifically: the emergency detection control chip IC includes VN pin 1, NC pins 2, 3, 6, 13, EN pin 4, BATP pin 5, CHRG pin 7, GND pin 8, LED1 pin 9, PROG pin 10, LED2 pin 11, VDD pin 12 and VL pin 14, the pin number of the VN pin is 1; the pin numbers of the NC pins are 2, 3, 6, 13 respectively; the pin number of the EN pin is 4; the pin number of the BATP pin is 5; the pin number of the CHRG pin is 7; the pin number of the GND pin is 8; the pin number of the LED1 pin is 9; the pin number of the PROG pin is 10; the pin number of the LED2 pin is 11; the pin number of the VDD pin is 12 and the pin number of the VL pin is 14.

[0043] Overview of Emergency Detection Control Chip IC

[0044] IC2893 is a special chip for emergency detection and control. The chip adopts high-voltage isolation and detection technology, directly monitors the state of AC input signal without any peripheral components, and directly or indirectly drives LED light strings. It also supports full voltage 85-265Vac input.

[0045] IC2893 supports charging status when the lamp is turned off with AC input.

[0046] IC2893 integrates high-precision single-cell lithium battery management and 0V battery charging functions, and has functions such as trickle charging, programmable constant current charging, constant voltage charging, and over-discharge protection.

[0047] IC2893EN has a dimming function in emergency mode, supports series current limiting resistors to directly drive a single string of LEDs, and also supports external boost circuits to drive multiple strings of LEDs.

[0048] When IC2893 is used in parallel with multiple lamps, LED lamps do not need to distinguish between neutral and live wires. IC2893 has a built-in AC leakage detection module.

[0049] IC2893 adopts ROHS compliant SOP14 package and has an operating temperature range of -40 degrees to 105 degrees.

[0050] like Figure 2-Figure 3 As shown: IC2893 adopts ROHSSOP14 package and internal structure framework diagram;

[0051] 1. The pin description of IC2893 chip is shown in the following table:

[0052] Pin Number Pin Name Function 1 VN AC neutral input 2 NC 3 NC 4 EN Output current / high level 5 BATP Connect to the positive terminal of the battery 6 NC 7 CHG Turn off the light to charge the logic, the default is OPEN state 8 GND Chip ground / battery ground 9 LED1 Charging indicator 10 PROG Charging current setting 11 LED2 Full power indicator 12 VDD Charging input terminal 13 NC 14 V L AC live wire input

[0053] 2. Limit parameters are shown in the following table:

[0054] parameter symbol value unit BATP, EN, VDD voltage <![CDATA[V tO ]]> -0.3 to +7 V CHRG, PROG, LED1, LED2 voltage <![CDATA[V EX ]]> -0.3 to +7 V VL, VN <![CDATA[V L 、In X ]]> -0.3 to +600 V Operating Junction Temperature <![CDATA[T J ]]> -40 to +150 ℃ Storage temperature <![CDATA[T STG ]]> -65 to +150 ℃ Thermal resistance <![CDATA[θ μ ]]> 90 ℃ / W Soldering temperature (Soldering, 10 sec) <![CDATA[T LEAD ]]> +300 ℃ ESD (Machine Model) - 200 V ESD (Human Body Model) - 2000 V

[0055] 3. Electrical parameters are shown in the following table:

[0056]

[0057] like Figure 1As shown, in this embodiment, specifically: the 4th pin of the constant current IC is respectively connected to the 3rd pin of the rectifier bridge DB1 and the capacitor C1, the 2nd pin of the constant current IC is connected to one end of the low voltage pin of the transformer T1 and one end of the diode D1 through the resistor R2, the 5th and 6th pins of the constant current IC are connected to one end of the high voltage pin of the transformer T1, the 7th pin of the constant current IC is connected to one end of the resistor R1, the 2nd pin of the constant current IC is connected to the 7th pin of the emergency detection control chip IC, the 1st pin of the emergency detection control chip IC is respectively connected to one end of the varistor RV1, one end of the insurance circuit F1 and the 4th pin of the rectifier bridge DB1 through the resistor R4, the 4th pin of the emergency detection control chip IC is connected to the LED+ lamp bead string and the LED- lamp bead string through the resistor R7, the 5th pin of the emergency detection control chip IC is respectively connected to the capacitor C3 and one end of the battery pack BAT, the emergency detection control chip IC Pin 9 is connected to one end of the LED1 lamp bead, and the other end of the LED1 lamp bead is respectively connected to one end of the resistor R6 and the LED2 lamp bead, pin 10 of the emergency detection control chip IC is connected to one end of the resistor R3, and pin 12 of the emergency detection control chip IC is respectively connected to the other end of the diode D1, the positive electrode of the capacitor C2 and the other end of the resistor R6, and pin 14 of the emergency detection control chip IC is respectively connected to pin 1 of the rectifier bridge DB1 and the neutral line input terminal N through the resistor R5, and pin 2 of the rectifier bridge DB1 is electrically connected to the other end of the capacitor C1, the other end of pin 1 of the constant current IC, the other end of the resistor R1, the other end of the high and low voltage pins of the transformer T1, the other end of the capacitor C2, the other end of the resistor R3, the other end of the LED2 lamp bead, pin 8 of the emergency detection control chip IC, capacitor C3, the other end of the battery pack BAT and the other end of the LED+ lamp bead string and the LED- lamp bead string.

[0058] like Figure 1 As shown, in this embodiment, specifically: the fuse circuit F1 is a fuse / PTC thermistor.

[0059] In this embodiment, specifically: the model of the emergency detection control chip IC is IC2893

[0060] Working principle: IC2893 is a professional emergency detection control chip that can realize EN pin level conversion according to the impedance state between VL and VN. When AC voltage is input between VL and VN or there is no AC voltage but the equivalent impedance of the detection line is greater than the threshold resistance, the internal switch tubes are cut off, and the EN output is in a high impedance state. Only when the AC voltage is zero and the impedance between VL and VN is less than the threshold resistance, EN outputs a high level.

[0061] AC Input EN output NOTE AC Yes High resistance AC Open Circuit High resistance AC short circuit High level (battery voltage) The impedance between L and N is less than the threshold resistance

[0062] The necessary prerequisite for the normal operation of the above logic is that the battery voltage is within the normal operating range.

[0063] (2) Battery Management

[0064] IC2893 integrates a complete single-cell lithium battery charging management and battery protection module, including overcharge protection, over-discharge protection, constant current charging, constant voltage charging and trickle charging mode.

[0065] Based on the special internal MOSFET architecture and anti-reverse charging circuit, IC2893 does not require external detection resistors and isolation diodes. When the external ambient temperature is too high or in high-power applications, thermal feedback can adjust the charging current to reduce the chip temperature. The maximum charging voltage is fixed between 4.2-4.3V, and the charging current can be set externally through a resistor. When the charging current reaches the final floating charge voltage and drops to 1 / 10 of the set value, the chip will terminate the charging cycle.

[0066] When the VDD voltage is greater than the minimum normal operating voltage, IC2893 starts charging the battery. If the battery voltage is lower than 2.9V, the chip enters the trickle mode to pre-charge the battery. When the battery voltage exceeds 2.9V, the charger uses the constant current mode to charge the battery. The charging current is determined by the resistance between the PROG terminal and the GND terminal. The calculation formula is as follows: Ichrg = (1 ÷ Rprog) × 1000

[0067] When the battery voltage approaches the floating charge voltage, the charging current gradually decreases and IC2893 enters the constant voltage charging mode. When the charging current decreases to the constant voltage charging cutoff ratio, the charging cycle ends. When the battery voltage drops below the recharge threshold, a new charging cycle automatically starts. The high-precision voltage reference source, error amplifier and resistor divider network inside the chip ensure that the accuracy of the BAT terminal modulation voltage is within 1%, meeting the requirements of lithium-ion and lithium polymer batteries.

[0068] Since the voltage detected by the battery charge and discharge management is the battery voltage, when designing the PCB layout, the battery terminals should be placed as close to the chip pins as possible, and high-frequency filter capacitors should be added near these two pins. This will also help suppress the interference of AC / DC on battery voltage sampling during switching. It is recommended to use 1uF chip capacitors.

[0069] (3) Charging indicator light

[0070] IC2893 integrates two status indicator outputs. When the battery is in charging state, LED1 is low level and LED2 is high impedance; when the battery is fully charged, LED1 is high impedance and LED2 is low level.

[0071] (4) Output current and emergency dimming function

[0072] IC2893 has a built-in 200 milliohm switch. When EN outputs a high level, a current limiting resistor can be connected between ENPIN and the LED output to power the LED load. The chip allows a maximum discharge current of 1.5A. IC2893 has an internal integrated emergency dimming module. In emergency mode, turning the switch on and off once within 5S will put the chip into dimming mode. The EN output PWM ratio is 100%-50%-25% (the actual current will be slightly less than this value due to the delay in driving the start), and it will be circulated in sequence. If the switch switching time is greater than 5S, the brightness will be 100% each time it is turned on. At the same time, after connecting the AC power once at any brightness, the brightness will default to 100% when entering the emergency state again.

[0073] (5) L / N mixed connection function

[0074] IC2893 has the function of automatic identification of mixed connection of neutral and live wires. When multiple emergency lamps are used in parallel, the input neutral and live wires can be connected to any end at will. It only needs to be quickly switched on and off once within 1S when AC power is first supplied. After that, all lamps in the same line will automatically identify and memorize the neutral and live wire status, completing the mixed connection alignment mode. This mode will automatically reset when the battery voltage is lower than 2V.

[0075] (6) Leakage detection

[0076] IC2893 has a built-in AC leakage detection module. When the voltage and loop resistance of the AC power grid are lower than the chip detection value, the system enters the emergency working state. At this time, when the residual voltage in the power grid is lower than the peak value of 20V, the system will maintain the emergency state.

[0077] (6) Turn off the light to charge

[0078] IC2893 has the function of charging with lights off. When the AC input is normal, the switch can be switched repeatedly within an interval of 0.5 to 5 seconds to control the switching of the CHRG pin between high and low impedance states. When applied, the CHRG pin can be directly connected to the OVP pin of the main control chip, or to the control ports such as Enable and PWM of the main control chip, and the charging function of lights off can be realized by repeated switching actions.

[0079] The CHRG pin logic is shown in the following table:

[0080]

[0081] Reasonable PCB layout is very important to ensure maximum system stability and low noise. Using multi-layer PCB is an effective way to avoid noise interference. In order to effectively reduce the noise of the current loop, the input bypass capacitor should be grounded separately. Connect the high current ground loop, the ground lead of the input bypass capacitor and the ground lead of the output filter to the same point (star grounding method) to minimize ground noise.

[0082] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A light-off charging LED bulb circuit, comprising a live input terminal L, a neutral input terminal N, a fuse circuit F1, a lightning surge protection circuit, a rectifier circuit, a filter circuit, an LED constant current IC internal control circuit, a constant current IC no-load control circuit, an output current regulation circuit, an AC input detection circuit, a transformer output power supply circuit and a charge and discharge control circuit, characterized in that: The live wire input terminal L is connected to one end of the lightning surge protection circuit through the insurance circuit F1, the neutral wire input terminal N is connected to the other end of the lightning surge protection circuit, the rectifier circuit is respectively connected to the lightning surge protection circuit, the filter circuit and the AC input detection circuit, the LED constant current IC internal control circuit is respectively connected to the filter circuit, the constant current IC no-load control circuit, the output current regulation circuit and the transformer output power supply circuit, and the charge and discharge control circuit is respectively connected to the constant current IC no-load control circuit, the transformer output power supply circuit and the AC input detection circuit; The charging and discharging control circuit includes a power supply rectification and filtering circuit, a charging indication circuit, an emergency main IC internal control circuit, a battery management circuit, an output control circuit and an LED working circuit; The internal control circuit of the emergency main IC is respectively connected to the transformer output power supply circuit, the power supply rectification and filtering circuit, the charging indication circuit, the battery management circuit, the output control circuit and the LED working circuit; The internal control circuit of the emergency main IC includes an emergency detection control chip IC, the power supply rectification and filtering circuit includes a capacitor C2, a resistor R6 and a diode D1, the charging indication circuit includes an LED1 lamp bead and an LED2 lamp bead, the battery management circuit includes a capacitor C3 and a battery pack BAT, the output control circuit includes a resistor R7, and the LED working circuit includes an LED+ lamp bead string and an LED- lamp bead string.

2. The LED bulb circuit for charging with lights off according to claim 1, characterized in that: The lightning surge protection circuit includes a varistor RV1, the rectifier circuit includes a rectifier bridge DB1, the varistor RV1 is connected between the live wire input terminal L and the neutral wire input terminal N, one end of the fuse circuit F1 is electrically connected to the live wire input terminal L, the other end of the fuse circuit F1 is respectively connected to one end of the varistor RV1 and pin 4 of the rectifier bridge DB1, pin 1 of the rectifier bridge DB1 is electrically connected to the neutral wire input terminal N, the filter circuit includes a capacitor C1, pin 3 of the rectifier bridge DB1 of the rectifier circuit is connected to the positive electrode of the capacitor C1, the LED constant current IC internal control circuit includes a constant current IC, the output current regulation circuit includes a resistor R1, the transformer output power supply circuit includes a transformer T1, and the AC input detection circuit includes a resistor R4 and a resistor R5.

3. The LED bulb circuit for charging with lights off according to claim 1, characterized in that: The emergency detection control chip IC includes VN pin 1, NC pins 2, 3, 6, 13, EN pin 4, BATP pin 5, CHRG pin 7, GND pin 8, LED1 pin 9, PROG pin 10, LED2 pin 11, VDD pin 12 and VL pin 14, the pin number of the VN pin is 1; the pin numbers of the NC pins are 2, 3, 6, 13 respectively; the pin number of the EN pin is 4; the pin number of the BATP pin is 5; the pin number of the CHRG pin is 7; the pin number of the GND pin is 8; the pin number of the LED1 pin is 9; the pin number of the PROG pin is 10; the pin number of the LED2 pin is 11; the pin number of the VDD pin is 12 and the pin number of the VL pin is 14.

4. The LED bulb circuit for charging with lights off according to claim 3, characterized in that: The 4th pin of the constant current IC is respectively connected to the 3rd pin of the rectifier bridge DB1 and the capacitor C1, the 2nd pin of the constant current IC is connected to one end of the low voltage pin of the transformer T1 and one end of the diode D1 through the resistor R2, the 5th and 6th pins of the constant current IC are connected to one end of the high voltage pin of the transformer T1, the 7th pin of the constant current IC is connected to one end of the resistor R1, the 2nd pin of the constant current IC is connected to the 7th pin of the emergency detection control chip IC, the 1st pin of the emergency detection control chip IC is respectively connected to one end of the varistor RV1, one end of the insurance circuit F1 and the 4th pin of the rectifier bridge DB1 through the resistor R4, the 4th pin of the emergency detection control chip IC is connected to the LED+ lamp bead string and the LED- lamp bead string through the resistor R7, the 5th pin of the emergency detection control chip IC is respectively connected to the capacitor C3 and one end of the battery pack BAT, and the 9th pin of the emergency detection control chip IC is connected to the LE One end of the D1 lamp bead is connected, the other end of the LED1 lamp bead is respectively connected to one end of the resistor R6 and the LED2 lamp bead, the 10th pin of the emergency detection control chip IC is connected to one end of the resistor R3, the 12th pin of the emergency detection control chip IC is respectively connected to the other end of the diode D1, the positive electrode of the capacitor C2 and the other end of the resistor R6, the 14th pin of the emergency detection control chip IC is respectively connected to the 1st pin of the rectifier bridge DB1 and the neutral line input terminal N through the resistor R5, and the 2nd pin of the rectifier bridge DB1 is electrically connected to the other end of the capacitor C1, the other end of the 1st pin of the constant current IC, the other end of the resistor R1, the other end of the high and low voltage pins of the transformer T1, the other end of the capacitor C2, the other end of the resistor R3, the other end of the LED2 lamp bead, the 8th pin of the emergency detection control chip IC, the capacitor C3, the other end of the battery pack BAT and the other end of the LED+ lamp bead string and the LED- lamp bead string.

5. The LED bulb circuit for charging with lights off according to claim 1, characterized in that: The fuse circuit F1 is a fuse / PTC thermistor.

6. The LED bulb circuit for charging with lights off according to claim 1, characterized in that: The model of the emergency detection control chip IC is IC2893.

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