CN112333880B - Emergency lighting power supply circuit applied to LED lamp - Google Patents

Abstract

The application provides an emergency lighting power supply circuit applied to an LED lamp, which comprises a main control chip module, a rectifying and filtering module, an input voltage detection module, a relay control module, a battery charging management module, a buzzer prompt module, an indicator lamp and test key module, a battery voltage detection module, an output no-load detection module, an inversion voltage output module and a load current sampling detection module, wherein the rectifying and filtering module is electrically connected with the input voltage detection module and the relay control module, and the battery charging management module, the battery voltage detection module, the output no-load detection module, the inversion voltage output module and the load current sampling detection module are sequentially and electrically connected. The emergency lighting power supply circuit applied to the LED lamp provided by the application is internally provided with the functional circuits such as the lithium battery, the battery protection, the on-off, the detection and the like and the corresponding output terminals, so that the conventional lighting LED lamp can realize actual emergency lighting.

Description

Emergency lighting power supply circuit applied to LED lamp

Technical Field

The application relates to the technical field of electronic circuits, in particular to an emergency lighting power supply circuit applied to an LED lamp.

Background

At present, an LED lamp with an emergency lighting function on the market can automatically light up when the mains supply is abnormal, provide necessary lighting or indication, and be used as a common lighting LED lamp when the mains supply is normal.

However, in practice, it is found that in order to ensure that the LED lamp can maintain a good working state at any time, it is necessary to regularly perform routine inspection on the LED lamp to avoid faults and failures, that is, it is necessary for an inspector to take the LED lamp to disassemble the LED lamp on site to perform routine inspection, which is inconvenient and wastes manpower and time to a certain extent.

Accordingly, it is desirable to provide an emergency lighting power supply circuit applied to an LED lamp to solve the above technical problems.

Disclosure of Invention

The application mainly solves the technical problem of providing an emergency lighting power supply circuit applied to an LED lamp, solves the problem that the LED lamp with an emergency lighting function is routinely checked by an inspector to avoid faults and failures due to the fact that the inspector needs to arrive at a site to disassemble the LED lamp, so that manpower and time are wasted to a certain extent, and is internally provided with functional circuits such as a lithium battery, battery protection, on-off, detection and the like and corresponding output terminals, so that the conventional lighting LED lamp can actually perform emergency lighting.

In order to solve the technical problems, the application adopts a technical scheme that an emergency lighting power supply circuit applied to an LED lamp is provided, and comprises a main control chip module 1, a rectifying and filtering module 2, an input voltage detection module 3, a relay control module 4, a battery charging management module 5, a buzzer prompt module 6, an indicator lamp and test key module 7, a battery voltage detection module 8, an output no-load detection module 9, an inverter voltage output module 10 and a load current sampling detection module 11; the main control chip module 1 is electrically connected with the rectifying and filtering module 2, the input voltage detection module 3, the relay control module 4, the battery charging management module 5, the buzzer prompt module 6, the indicator lamp and test key module 7, the battery voltage detection module 8, the output no-load detection module 9, the inversion voltage output module 10 and the load current sampling detection module 11, the rectifying and filtering module 2 is electrically connected with the input voltage detection module 3 and the relay control module 4, and the battery charging management module 5, the battery voltage detection module 8, the output no-load detection module 9, the inversion voltage output module 10 and the load current sampling detection module 11 are electrically connected in sequence.

In the examples, it is preferable that:

the main control chip module 1 at least comprises a special chip U2 with the model number YTE 1809; the 3 rd pin of the special chip U2 is connected with the relay control module 4, the 5 th pin is connected with the input voltage detection module 3 and the 14 th pin is grounded;

the battery charging management module 5 at least comprises a storage battery port BT PIN2, a fuse F2 and a diode D9; the 1 st PIN of the battery port BT PIN2 is grounded, the 2 nd PIN is connected with the 2 nd PIN of the special chip U2 through the fuse F2, the positive electrode port B+ of the battery is connected between the fuse F2 and the 2 nd PIN of the battery port BT PIN2, the VDD port is connected with the 1 st PIN of the special chip U2, the anode of the diode D9 is connected between the fuse F2 and the 2 nd PIN of the special chip U2, and the cathode of the diode D9 is connected between the VDD port and the 1 st PIN of the special chip U2;

the buzzer prompt module 6 at least comprises a loudspeaker SP1 and a diode D8; the positive pole and the negative pole of the speaker SP1 are respectively connected with the 1 st pin and the 4 th pin of the special chip U2, the anode of the diode D8 is connected between the negative pole of the speaker SP1 and the 4 th pin of the special chip U2, and the cathode of the diode D8 is connected between the positive pole of the speaker SP1 and the 1 st pin of the special chip U2;

the indicator lamp and TEST key module 7 at least comprises a TEST port TEST PIN3; the 1 st PIN, the 2 nd PIN and the 3 rd PIN of the TEST port TEST PIN3 are respectively connected with the 6 th PIN, the 7 th PIN and the 8 th PIN of the special chip U2;

the battery voltage detection module 8 at least comprises a resistor R11 and a resistor R12; one end of a series circuit of the resistor R11 and the resistor R12 is connected with the fuse F2, the other end is connected with a 13 th pin of the special chip U2, and a 10 th pin of the special chip U2 is connected between the resistor R11 and the resistor R12;

the output no-load detection module 9 at least comprises a resistor R9, a resistor R10, a capacitor C6 and a diode D5; one end of a series circuit of the resistor R9 and the resistor R10 and one end of the capacitor C6 are respectively connected between the resistor R5 and the cathode of the diode D5, the other end of the series circuit of the resistor R9 and the resistor R10 is connected with the 13 th pin of the special chip U2, the 11 th pin of the special chip U2 is connected between the resistor R9 and the resistor R10, the other end of the capacitor C6 is grounded, and the resistor R5 is connected between the cathode of the diode D9 and the cathode of the diode D5;

the inverter voltage output module 10 at least comprises a rectifier transformer TR1 with the model EE 10-2, a diode D4, a load port LED Light PIN4 and a MOS tube Q2 with the model N-MOSFET; a primary end of the rectifier transformer TR1 is connected to the fuse F2, another primary end of the rectifier transformer TR1 is connected to an anode of the diode D5, a secondary end of the rectifier transformer TR1 is simultaneously connected to a 2 nd PIN and a 4 th PIN of the load port LED Light PIN4 through the diode D4, another secondary end is simultaneously connected to a 1 st PIN and a 3 rd PIN of the load port LED Light PIN4, a D electrode of the MOS transistor Q2 is connected between the primary end of the rectifier transformer TR1 and the anode of the diode D5, a G electrode is connected to a 12 th PIN and a S electrode of the special chip U2, and a load current sampling detection module 11;

the load current sampling detection module 11 at least comprises a resistor R6, a resistor R7, a resistor R8 and a capacitor C5; the S pole of the MOS tube Q2 is grounded through the resistor R7, one end of a parallel circuit of the resistor R6, the resistor R7 and the capacitor C5 is connected with the 9 th pin of the special chip U2, the other end of the parallel circuit is connected with the 10 th pin of the special chip U2 through the capacitor C7, and the resistor R8 is connected between the resistor R6 and the capacitor C5.

In the examples, it is preferable that:

the rectifying and filtering module 2 at least comprises a rectifying bridge D1 with the model MB10S and a special power chip U1 with the model YTE-504;

the input voltage detection module 3 at least comprises a resistor R1, a resistor R2 and a resistor R4;

the 3 rd PIN of the rectifier bridge D1 is connected to the 2 nd PIN and the 4 th PIN of the TEST port TEST PIN1, and is connected to the 3 rd PIN, the 1 st PIN of the TEST port TEST PIN1, the ground connection and the 2 nd PIN of the rectifier bridge D1 through a fuse F1, and is simultaneously connected to the anode of the diode D10 and one end of a series circuit of the resistor R1 and the resistor R4;

the D pole of the special power chip U1 is connected with the cathode of the diode D10, and the CS pole is connected with the cathode of the diode D2 and the VDD pole through a resistor R3 and connected with the cathode of the diode D3;

the 1 st PIN of the TEST port TEST PIN1 is connected with the relay control module 4, one end of the resistor R2 and the other end of the series circuit of the resistor R1 and the resistor R4 are simultaneously connected with the 5 th PIN of the special chip U2, the other end of the resistor R2 is grounded, and the capacitor C1 is connected between the 1 st PIN and the 2 nd PIN of the rectifier bridge D1;

the anode of the diode D3 is connected with the cathode of the diode D7, the anode of the diode D7 and one end of the capacitor C3 are simultaneously connected with the VDD port, one end of the inductor L1 is connected between the resistor R3 and the cathode of the diode D2, the other end of the inductor L1 is connected between one end of the capacitor C3 and the anode of the diode D7, one end of the capacitor C2 is connected between the VDD pole of the special power chip U1 and the cathode of the diode D3, the other end of the capacitor C2 is connected between one end of the inductor L1 and the resistor R3, and the anode of the diode D2 and the other end of the capacitor C3 are simultaneously grounded.

In the examples, it is preferable that:

the RELAY control module 4 at least comprises a RELAY J1; one end of the RELAY J1 is connected to the 1 st PIN and the 2 nd PIN of the TEST port TEST PIN1, the other end is connected to the fuse F2 and the anode of the diode D6, the collector of the NPN triode Q1 is connected to the cathode of the diode D6 and the anode and the base of the zener diode ZD1 simultaneously, the 3 rd PIN and the emitter of the special chip U2 are grounded through a resistor R13, a resistor R15 is connected between the emitter of the NPN triode Q1 and the base of the NPN triode Q1, and the cathode of the zener diode ZD1 is connected to the VDD port.

In the examples, it is preferable that:

the diode D2, the diode D3, the diode D4, the diode D5 and the diode D7 at least comprise ultrafast recovery rectifier diodes with the model of ES 1J;

the diode D6 and the diode D10 at least comprise rectifier diodes with the model number M7.

The beneficial effects of the application are as follows: the emergency lighting power supply circuit applied to the LED lamp solves the problem that the conventional LED lamp with an emergency lighting function is routinely checked to avoid faults and failures due to the fact that an inspector needs to take apart the LED lamp on site to avoid the faults and failures, so that manpower and time are wasted to a certain extent, and functional circuits such as a lithium battery, battery protection, on-off, detection and the like and corresponding output terminals are built in the emergency lighting power supply circuit, so that the conventional lighting LED lamp can realize actual emergency lighting.

Drawings

FIG. 1 is a schematic block diagram of a first preferred embodiment of an emergency lighting power circuit for an LED lamp according to the present application;

fig. 2 is a schematic circuit diagram of a first preferred embodiment of an emergency lighting power supply circuit for an LED lamp according to the present application.

Detailed Description

The technical scheme of the application is described in detail below with reference to the drawings.

Referring to fig. 1, the emergency lighting power supply circuit applied to an LED lamp in this embodiment includes a main control chip module 1, a rectifying and filtering module 2, an input voltage detection module 3, a relay control module 4, a battery charging management module 5, a buzzer prompt module 6, an indicator light and test key module 7, a battery voltage detection module 8, an output no-load detection module 9, an inverter voltage output module 10, and a load current sampling detection module 11; the main control chip module 1 is electrically connected with the rectifying and filtering module 2, the input voltage detection module 3, the relay control module 4, the battery charging management module 5, the buzzer prompt module 6, the indicator lamp and test key module 7, the battery voltage detection module 8, the output no-load detection module 9, the inverter voltage output module 10 and the load current sampling detection module 11, the rectifying and filtering module 2 is electrically connected with the input voltage detection module 3 and the relay control module 4, and the battery charging management module 5, the battery voltage detection module 8, the output no-load detection module 9, the inverter voltage output module 10 and the load current sampling detection module 11 are electrically connected in sequence.

Preferably, the inverter voltage output module 10 is in communication connection with the main control chip module 1 by adopting a Pulse Width Modulation (PWM) technology, so that the bias of the inverter voltage output module 10 is modulated according to the change of the corresponding load, thereby realizing the change of the output of the inverter voltage output module 10, further keeping the output voltage of the inverter voltage output module 10 constant when the working condition changes, and being beneficial to improving the anti-interference capability of the inverter voltage output module 10.

In this embodiment, when the circuit is connected to the power supply voltage of the external power grid, the rectifying and filtering module 2 converts the alternating current with the level floating up and down at the zero point into unidirectional direct current through the unidirectional conduction characteristic of the diode and outputs the direct current to the main control chip module 1 for stabilizing voltage by 5V, and meanwhile, the input voltage detection module 3 obtains the voltage after the AC-DC rectifying and filtering in the rectifying and filtering module 2 for detection, so as to determine the power supply voltage intensity of the current external power grid and feed back the signal information into the main control chip module 1;

after the main control chip module 1 obtains the regulated power supply input by the rectifying and filtering module 2, battery voltage detection 8, output no-load detection 9 and load current sampling detection module 11 can be performed, and when the input voltage detection module 3, battery voltage detection 8, output no-load detection 10 and load current sampling detection module 11 detect faults, fault information can be fed back to the main control chip module 1 so that the main control chip module 1 sounds the buzzer prompt module 6 and the indicator lamp and test key module 7 to prompt faults;

the main control chip module 1 can carry out charge and discharge management on the battery charge management module 5, namely when the circuit is connected with the power supply voltage of an external power grid, the battery charge management module 5 can be controlled to charge, and if the circuit is not connected with the power supply voltage of the external power grid currently, the main control chip module 1 can control the battery charge management module 5 to discharge so as to meet the working voltage requirement of the circuit;

and when the circuit is connected to the power supply voltage of the external power grid, the rectification filter module 2 can convert the alternating current of the external power grid into direct current required by the main control chip module 1, or the main control chip module 1 can control the battery charging management module 5 to obtain direct current after discharging so as to meet the working voltage requirement of the circuit, and the inverter voltage output module 10 can convert the obtained direct current into alternating voltage required by the load and stably output the alternating voltage to the load.

Preferably, the application is provided with an external plug-in type detection switch and a three-color indicator lamp suite, and a product connecting wire adopts a screw-free wiring terminal seat.

Preferably, the indication function of the present application may be: the green light is a main electric state indicator lamp, the red light is a charging indicator lamp, the full-electric red light is extinguished, and the yellow light is a fault indicator lamp; and a buzzer prompt and fault alarm function is built in.

Therefore, the emergency lighting power supply circuit applied to the LED lamp described in the implementation figure 1 solves the problem that the conventional LED lamp with the emergency lighting function is routinely checked by disassembling the LED lamp to avoid faults and failures due to the fact that an inspector needs to arrive at a site, so that manpower and time are wasted to a certain extent, and functional circuits such as a lithium battery, battery protection, on-off, detection and the like and corresponding output terminals are built in the conventional LED lamp, so that the conventional LED lamp can be subjected to actual emergency lighting.

In addition, the emergency lighting power supply circuit applied to the LED lamp, which is described in the implementation fig. 1, is in communication connection with the main control chip module through adopting a Pulse Width Modulation (PWM) technology, so that the bias of the inverter voltage output module is modulated according to the change of the corresponding load, the change of the output of the inverter voltage output module is realized, the output voltage of the inverter voltage output module can be kept constant when the working condition is changed, and the anti-interference capability of the power supply circuit is improved.

Referring to fig. 2, in an embodiment of the present application, it is preferable that:

the main control chip module 1 at least comprises a special chip U2 with the model number of YTE 1809; the 3 rd pin of the special chip U2 is connected with the relay control module 4, the 5 th pin is connected with the input voltage detection module 3 and the 14 th pin is grounded;

the battery charging management module 5 at least comprises a storage battery port BT PIN2, a fuse F2 and a diode D9; the 1 st PIN of the battery port BT PIN2 is grounded, the 2 nd PIN is connected with the 2 nd PIN of the special chip U2 through a fuse F2, the positive electrode port B+ of the battery is connected between the fuse F2 and the 2 nd PIN of the battery port BT PIN2, the VDD port is connected with the 1 st PIN of the special chip U2, the anode of the diode D9 is connected between the fuse F2 and the 2 nd PIN of the special chip U2, and the cathode of the diode D9 is connected between the VDD port and the 1 st PIN of the special chip U2;

the buzzer prompt module 6 at least comprises a loudspeaker SP1 and a diode D8; the positive pole and the negative pole of the loudspeaker SP1 are respectively connected with the 1 st pin and the 4 th pin of the special chip U2, the anode of the diode D8 is connected between the negative pole of the loudspeaker SP1 and the 4 th pin of the special chip U2, and the cathode of the diode D8 is connected between the positive pole of the loudspeaker SP1 and the 1 st pin of the special chip U2;

the indicator lamp and TEST key module 7 at least comprises a TEST port TEST PIN3; the 1 st PIN, the 2 nd PIN and the 3 rd PIN of the TEST port TEST PIN3 are respectively connected with the 6 th PIN, the 7 th PIN and the 8 th PIN of the special chip U2;

the battery voltage detection module 8 at least comprises a resistor R11 and a resistor R12; one end of a series circuit of the resistor R11 and the resistor R12 is connected with the fuse F2, the other end is connected with the 13 th pin of the special chip U2, and the 10 th pin of the special chip U2 is connected between the resistor R11 and the resistor R12;

the output no-load detection module 9 at least comprises a resistor R9, a resistor R10, a capacitor C6 and a diode D5; one end of a series circuit of the resistor R9 and the resistor R10 and one end of the capacitor C6 are respectively connected between the resistor R5 and the cathode of the diode D5, the other end of the series circuit of the resistor R9 and the resistor R10 is connected with the 13 th pin of the special chip U2, the 11 th pin of the special chip U2 is connected between the resistor R9 and the resistor R10, the other end of the capacitor C6 is grounded, and the resistor R5 is connected between the cathode of the diode D9 and the cathode of the diode D5;

the inverter voltage output module 10 at least comprises a rectifier transformer TR1 with the model EE 10-2, a diode D4, a load port LED Light PIN4 and a MOS tube Q2 with the model N-MOSFET; one primary end of the rectifier transformer TR1 is connected with the fuse F2, the other primary end of the rectifier transformer TR1 is connected with the anode of the diode D5, the secondary end of the rectifier transformer TR1 is simultaneously connected with the 2 nd PIN and the 4 th PIN of the load port LED Light PIN4 through the diode D4, the other secondary end is simultaneously connected with the 1 st PIN and the 3 rd PIN of the load port LED Light PIN4, the D electrode of the MOS tube Q2 is connected between the primary end of the rectifier transformer TR1 and the anode of the diode D5, the G electrode is connected with the 12 th PIN of the special chip U2 and the S electrode is connected with the load current sampling detection module 11;

the load current sampling detection module 11 at least comprises a resistor R6, a resistor R7, a resistor R8 and a capacitor C5; the S pole of the MOS tube Q2 is grounded through a resistor R7, one end of a parallel circuit of the resistor R6, the resistor R7 and a capacitor C5 is connected with the 9 th pin of the special chip U2, the other end of the parallel circuit is connected with the 10 th pin of the special chip U2 through the capacitor C7, and the resistor R8 is connected between the resistor R6 and the capacitor C5.

In this embodiment, the battery voltage detection module 8 of the present application mainly adopts the principle of series voltage division of resistors, that is, after voltage division by the resistor R11 and the resistor R12, signals are taken from the upper surface of the voltage division resistor and sent to the operational amplifier for comparison and amplification, and then an analog signal is output to the special chip U2;

and the output no-load detection module 9 adopts the principle of series voltage division of resistors, namely, after voltage division is carried out through the resistor R9 and the resistor R10, signals are taken from the upper surface of the voltage division resistor and are sent to an operational amplifier for comparison and amplification, then an analog signal is output to the special chip U2, and meanwhile, a capacitor C6 is connected in parallel to the resistor and can be used for filtering interference signals;

the special chip U2 can control the duty ratio through the high-frequency PWM pulse width modulation signal so as to achieve the purpose of stable output and control the bias of the MOS tube Q2, thereby realizing the change of the output of the MOS tube Q2, further keeping the output voltage of the MOS tube Q2 constant when the working condition changes, and being beneficial to improving the anti-interference capability of a power circuit;

and, the primary coil of the rectifier transformer TR1 may be connected to the dc power supply, and the secondary coil may induce a high frequency voltage therefrom and convert the dc voltage into an ac voltage to supply to a load;

and, the primary coil and one end of the secondary coil in the rectifier transformer TR1 are painted with black dots, which are marks of the same name end, and the voltages of the two ends are increased and decreased simultaneously, wherein the voltages of the black dot ends are the same in polarity;

and R, C in the load current sampling detection module 11 is connected in parallel to form a low-pass filter circuit which is connected to the special chip U2, so that the interference of the 50Hz power frequency signal can be effectively filtered;

and the diode D8 and the diode D9 in the battery charging management module 5 and the buzzer prompt module 6 can form a loop when the counter potential occurs in the circuit, so that the influence of the counter potential generated when the current is disconnected on the circuit or the damage of components can be effectively prevented.

Preferably, when the power is the same, the higher the switching frequency is, the smaller the volume of the rectifier transformer TR1 is, but the higher the requirement on the MOS transistor Q2 is;

and, the secondary side of the MOS tube Q2 can have a plurality of windings or a winding has a plurality of taps, in order to obtain the required output;

and, when the MOS transistor Q2 is turned on, the rectifier transformer TR1 can start to store energy, and when the MOS transistor Q2 is turned off, the rectifier transformer TR1 can start to release energy to the secondary stage.

Preferably, the rectifier transformer TR1 and the MOS transistor Q2 together form a self-excited (or separately excited) intermittent oscillator, so as to modulate the input dc voltage into a high-frequency pulse voltage, to perform energy transfer and conversion functions, whereas in a flyback circuit, when the MOS transistor Q2 is turned on, the rectifier transformer TR1 converts electric energy into magnetic field energy to be stored, and when the MOS transistor Q2 is turned off, the rectifier transformer TR1 releases the magnetic field energy, and in a forward circuit, when the MOS transistor Q2 is turned on, the input voltage is directly supplied to a load and energy is stored in an energy storage inductor, and when the MOS transistor Q2 is turned off, the energy storage inductor performs freewheel transfer to the load, so that the input dc voltage is converted into various required low voltages.

Referring further to FIG. 2, in an embodiment of the present application, it is preferred that:

the rectifying and filtering module 2 at least comprises a rectifying bridge D1 with the model MB10S and a special power chip U1 with the model YTE-504;

the input voltage detection module 3 at least comprises a resistor R1, a resistor R2 and a resistor R4;

the 3 rd PIN of the rectifier bridge D1 is connected to the 2 nd PIN and the 4 th PIN of the TEST port TEST PIN1 through the fuse F1, the 3 rd PIN and the 1 st PIN of the TEST port TEST PIN1 are grounded, and the 2 nd PIN is simultaneously connected to the anode of the diode D10 and one end of the series circuit of the resistor R1 and the resistor R4;

the D pole of the special power chip U1 is connected with the cathode of the diode D10, and the CS pole is connected with the cathode of the diode D2 and the cathode of the diode D3 through the resistor R3;

the 1 st PIN of the TEST port TEST PIN1 is connected with the relay control module 4, one end of the resistor R2 and the other end of the serial circuit of the resistor R1 and the resistor R4 are simultaneously connected with the 5 th PIN of the special chip U2, the other end of the resistor R2 is grounded, and the capacitor C1 is connected between the 1 st PIN and the 2 nd PIN of the rectifier bridge D1;

the anode of the diode D3 is connected with the cathode of the diode D7, the anode of the diode D7 and one end of the capacitor C3 are connected with the VDD port at the same time, one end of the inductor L1 is connected between the resistor R3 and the cathode of the diode D2, the other end of the inductor L1 is connected between one end of the capacitor C3 and the anode of the diode D7, one end of the capacitor C2 is connected between the VDD pole of the special power chip U1 and the cathode of the diode D3, the other end of the capacitor C2 is connected between one end of the inductor L1 and the resistor R3, and the anode of the diode D2 and the other end of the capacitor C3 are grounded at the same time.

In this embodiment, the rectifier bridge D1 may utilize the unidirectional conductivity of the diode to convert the ac voltage into the dc voltage, so as to implement the rectifying and filtering function of the rectifying and filtering module 2;

the application can utilize the characteristic of capacitor isolation direct current to bypass and reflux the residual alternating current component rectified by the rectifier bridge D1, and then the capacitor C1 connected in parallel to the two ends of the rectifier bridge D1 achieves the filtering effect;

and, because the output after full-wave rectification of the rectifier bridge D1 is not a flat direct current voltage, but 100 pulsating direct current voltages from zero to maximum value and from maximum value to zero per second, but such unstable voltage is not available for direct current requirements of the subsequent circuit (except for direct power consumption equipment such as charging and heating), then the output voltage can be stabilized to a smooth average value by utilizing the charging and discharging characteristics (high charging and low discharging) of the capacitor, and then the capacitor C1 connected in parallel to two ends of the rectifier bridge D1 achieves a shaping effect;

and because the rectifying output of the rectifying bridge D1 is pulsation, the average effective value is much lower than the original alternating voltage value, the overall efficiency is low by subtracting the forward voltage drop of the rectifying bridge D1, and the peak charging characteristic of the capacitor (the voltage at two ends can reach the peak value) can lead the output voltage to be close to the peak value of the original pulsation voltage (1.414 times of the original alternating current), thus greatly improving the output efficiency, and further leading the capacitor C1 connected in parallel at two ends of the rectifying bridge D1 to achieve the effect of improving the average value;

after the alternating current power supply is input into the rectifier bridge D1, the EMI filtering module 1 can be input to filter the interference on the power grid, and meanwhile, the interference of the power supply on the power grid is also filtered;

when the frequency of the input signal is smaller than f0, the signal relative circuit is direct current, and the total impedance of the circuit is equal to R1; when the frequency of the input signal is greater than f0, the capacitance of the capacitor C2 is relatively small, and the total impedance is the resistance value of the resistor and the capacitance of the upper capacitor; when the frequency is high to a certain degree, the total impedance is 0;

the LC parallel resonance circuit formed by the resistor R3, the capacitor C2, the capacitor C3 and the inductor L1 can select useful frequency components from input signals to inhibit useless frequency components or noise, namely clutter existing in an external power grid is filtered, so that interference of high-frequency pulses of the external power grid on a power supply is effectively filtered;

and the input voltage detection module 3 mainly adopts a resistor series voltage division principle, namely after voltage division is performed through the resistor R1 and the resistor R2, signals are taken from the upper surface of the voltage division resistor and are sent to the operational amplifier for comparison and amplification, an analog signal is output to the special chip U2, and meanwhile, the resistor R4 is grounded to effectively prevent counter potential from remembering to damage a circuit.

Referring further to FIG. 2, in an embodiment of the present application, it is preferred that:

the RELAY control module 4 at least comprises a RELAY J1; one end of the RELAY RELAY J1 is respectively connected with the 1 st PIN and the 2 nd PIN of the TEST port TEST PIN1, the other end is respectively connected with the fuse F2 and the anode of the diode D6, the collector of the NPN triode Q1 is simultaneously connected with the cathode of the diode D6 and the anode of the zener diode ZD1, the base is connected with the 3 rd PIN and the emitter of the special chip U2 through a resistor R13 to be grounded, the resistor R15 is connected between the emitter of the NPN triode Q1 and the base of the NPN triode Q1, and the cathode of the zener diode ZD1 is connected with the VDD port.

In the embodiment, an NPN triode is adopted to drive a RELAY, when the positive power supply input is 0V, the triode is cut OFF, and the RELAY J1 releases OFF; conversely, when the positive power input is +VCC, the triode is saturated and RELAY RELAY J1 is turned ON;

and when the current suddenly changes or decreases, the diode D6 and the zener diode ZD1 can control the current of the circuit to change more gradually, so as to avoid the occurrence of surge voltage and improve the use safety of the circuit.

Referring further to FIG. 2, in an embodiment of the present application, it is preferred that:

the diode D2, the diode D3, the diode D4, the diode D5 and the diode D7 at least comprise ultrafast recovery rectifier diodes with the model of ES 1J;

the diode D6 and the diode D10 at least comprise rectifying diodes with the model number of M7;

the diodes D8 and D9 include at least a switching diode of model 4148.

In the embodiment, the fast recovery rectifying diode can be used as a high-frequency, low-voltage, high-current rectifying, follow current and protection diode;

when the current suddenly changes or decreases, the switching diode can control the current of the circuit to change more gradually so as to avoid the occurrence of surge voltage and improve the use safety of the segmented switch controller circuit;

and the rectifier diode can convert alternating current with alternating direction into pulse direct current with single direction by utilizing unidirectional conductivity of the diode.

Therefore, the emergency lighting power supply circuit applied to the LED lamp described in the implementation figure 2 solves the problem that the conventional LED lamp with the emergency lighting function is routinely checked by disassembling the LED lamp to avoid faults and failures due to the fact that an inspector needs to arrive at a site, so that manpower and time are wasted to a certain extent, and functional circuits such as a lithium battery, battery protection, on-off, detection and the like and corresponding output terminals are built in the conventional LED lamp, so that the conventional LED lamp can be subjected to actual emergency lighting.

In addition, the emergency lighting power supply circuit applied to the LED lamp described in the embodiment of the fig. 2 can filter the frequency points except the specific frequency or the frequency points in the power line, so that a user can obtain a power supply signal with the specific frequency, or eliminate the power supply signal with the specific frequency, and the disturbance voltage emission of a product to a power grid can be effectively reduced, so that the disturbance resistance of the product is improved, and the influence of an unclean power supply of the power grid on equipment is prevented.

The foregoing is only illustrative of the present application and is not to be construed as limiting the scope of the application, and all equivalent structures made by the description of the application and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the application.

Claims (1)

1. An emergency lighting power supply circuit applied to an LED lamp is characterized in that: the device comprises a main control chip module (1), a rectifying and filtering module (2), an input voltage detection module (3), a relay control module (4), a battery charging management module (5), a buzzer prompt module (6), an indicator lamp and test key module (7), a battery voltage detection module (8), an output no-load detection module (9), an inversion voltage output module (10) and a load current sampling detection module (11); the main control chip module (1) is electrically connected with the rectifying and filtering module (2), the input voltage detection module (3), the relay control module (4), the battery charging management module (5), the buzzer prompt module (6), the indicator light and test key module (7), the battery voltage detection module (8), the output no-load detection module (9), the inversion voltage output module (10) and the load current sampling detection module (11), the rectifying and filtering module (2) is electrically connected with the input voltage detection module (3) and the relay control module (4), and the battery charging management module (5), the battery voltage detection module (8), the output no-load detection module (9), the inversion voltage output module (10) and the load current sampling detection module (11) are electrically connected in sequence;

the main control chip module (1) at least comprises a special chip U2 with the model YTE 1809; the 3 rd pin of the special chip U2 is connected with the relay control module (4), the 5 th pin is connected with the input voltage detection module (3) and the 14 th pin is grounded;

the battery charging management module (5) at least comprises a storage battery port BT PIN2, a fuse F2 and a diode D9; the 1 st PIN of the battery port BT PIN2 is grounded, the 2 nd PIN is connected with the 2 nd PIN of the special chip U2 through the fuse F2, the positive electrode port B+ of the battery is connected between the fuse F2 and the 2 nd PIN of the battery port BT PIN2, the VDD port is connected with the 1 st PIN of the special chip U2, the anode of the diode D9 is connected between the fuse F2 and the 2 nd PIN of the special chip U2, and the cathode of the diode D9 is connected between the VDD port and the 1 st PIN of the special chip U2;

the buzzer prompt module (6) at least comprises a loudspeaker SP1 and a diode D8; the positive pole and the negative pole of the speaker SP1 are respectively connected with the 1 st pin and the 4 th pin of the special chip U2, the anode of the diode D8 is connected between the negative pole of the speaker SP1 and the 4 th pin of the special chip U2, and the cathode of the diode D8 is connected between the positive pole of the speaker SP1 and the 1 st pin of the special chip U2;

the indicator lamp and the TEST key module (7) at least comprise a TEST port TEST PIN3; the 1 st PIN, the 2 nd PIN and the 3 rd PIN of the TEST port TEST PIN3 are respectively connected with the 6 th PIN, the 7 th PIN and the 8 th PIN of the special chip U2;

the battery voltage detection module (8) at least comprises a resistor R11 and a resistor R12; one end of a series circuit of the resistor R11 and the resistor R12 is connected with the fuse F2, the other end is connected with a 13 th pin of the special chip U2, and a 10 th pin of the special chip U2 is connected between the resistor R11 and the resistor R12;

the output no-load detection module (9) at least comprises a resistor R9, a resistor R10, a capacitor C6 and a diode D5; one end of a series circuit of the resistor R9 and the resistor R10 and one end of the capacitor C6 are respectively connected between the resistor R5 and the cathode of the diode D5, the other end of the series circuit of the resistor R9 and the resistor R10 is connected with the 13 th pin of the special chip U2, the 11 th pin of the special chip U2 is connected between the resistor R9 and the resistor R10, the other end of the capacitor C6 is grounded, and the resistor R5 is connected between the cathode of the diode D9 and the cathode of the diode D5;

the inverter voltage output module (10) at least comprises a rectifier transformer TR1 with the model EE 10-2, a diode D4, a load port LED Light PIN4 and a MOS tube Q2 with the model N-MOSFET; a primary end of the rectifier transformer TR1 is connected to the fuse F2, another primary end of the rectifier transformer TR1 is connected to an anode of the diode D5, a secondary end of the rectifier transformer TR1 is simultaneously connected to a 2 nd PIN and a 4 th PIN of the load port LED Light PIN4 through the diode D4, another secondary end is simultaneously connected to a 1 st PIN and a 3 rd PIN of the load port LED Light PIN4, a D electrode of the MOS transistor Q2 is connected between the primary end of the rectifier transformer TR1 and the anode of the diode D5, a G electrode is connected to a 12 th PIN and a S electrode of the special chip U2, and the G electrode is connected to the load current sampling detection module (11);

the load current sampling detection module (11) at least comprises a resistor R6, a resistor R7, a resistor R8 and a capacitor C5; the S pole of the MOS tube Q2 is grounded through the resistor R7, one end of a parallel circuit of the resistor R6, the resistor R7 and the capacitor C5 is connected with the 9 th pin of the special chip U2, the other end of the parallel circuit is connected with the 10 th pin of the special chip U2 through the capacitor C7, and the resistor R8 is connected between the resistor R6 and the capacitor C5;

the rectifying and filtering module (2) at least comprises a rectifying bridge D1 with the model MB10S and a special power chip U1 with the model YTE-504;

the input voltage detection module (3) at least comprises a resistor R1, a resistor R2 and a resistor R4;

the 3 rd PIN of the rectifier bridge D1 is connected to the 2 nd PIN and the 4 th PIN of the TEST port TEST PIN1, and is connected to the 3 rd PIN, the 1 st PIN of the TEST port TEST PIN1, the ground connection and the 2 nd PIN of the rectifier bridge D1 through a fuse F1, and is simultaneously connected to the anode of the diode D10 and one end of a series circuit of the resistor R1 and the resistor R4;

the D pole of the special power chip U1 is connected with the cathode of the diode D10, and the CS pole is connected with the cathode of the diode D2 and the VDD pole through a resistor R3 and connected with the cathode of the diode D3;

the 1 st PIN of the TEST port TEST PIN1 is connected with the relay control module (4), one end of the resistor R2 and the other end of the series circuit of the resistor R1 and the resistor R4 are simultaneously connected with the 5 th PIN of the special chip U2, the other end of the resistor R2 is grounded, and the capacitor C1 is connected between the 1 st PIN and the 2 nd PIN of the rectifier bridge D1;

the anode of the diode D3 is connected with the cathode of the diode D7, the anode of the diode D7 and one end of the capacitor C3 are simultaneously connected with the VDD port, one end of the inductor L1 is connected between the resistor R3 and the cathode of the diode D2, the other end of the inductor L1 is connected between one end of the capacitor C3 and the anode of the diode D7, one end of the capacitor C2 is connected between the VDD pole of the special power chip U1 and the cathode of the diode D3, the other end of the capacitor C2 is connected between one end of the inductor L1 and the resistor R3, and the anode of the diode D2 and the other end of the capacitor C3 are simultaneously grounded;

the RELAY control module (4) at least comprises a RELAY J1; one end of the RELAY RELAY J1 is respectively connected with the 1 st PIN and the 2 nd PIN of the TEST port TEST PIN1, the other end is respectively connected with anodes of the fuse F2 and the diode D6, a collector of the NPN triode Q1 is simultaneously connected with a cathode of the diode D6 and an anode and a base of the zener diode ZD1, the 3 rd PIN and the emitter of the special chip U2 are grounded through a resistor R13, a resistor R15 is connected between an emitter of the NPN triode Q1 and the base of the NPN triode Q1, and a cathode of the zener diode ZD1 is connected with the VDD port;

the diode D2, the diode D3, the diode D4, the diode D5 and the diode D7 at least comprise ultrafast recovery rectifier diodes with the model of ES 1J;

the diode D6 and the diode D10 at least comprise rectifier diodes with the model number M7.