CN110381644B

CN110381644B - Constant-current LED driving circuit integrating emergency lighting

Info

Publication number: CN110381644B
Application number: CN201910771688.6A
Authority: CN
Inventors: 柳森坊; 江华荣; 郑榕龙; 卢凯
Original assignee: XIAMEN YADE ELECTRONIC TECHNOLOGY CO LTD
Current assignee: XIAMEN YADE ELECTRONIC TECHNOLOGY CO LTD
Priority date: 2019-08-21
Filing date: 2019-08-21
Publication date: 2024-09-13
Anticipated expiration: 2039-08-21
Also published as: CN110381644A

Abstract

The invention relates to an LED driving circuit, in particular to a constant-current LED driving circuit integrating emergency lighting, which corrects and outputs a power factor after filtering and rectifying an input alternating-current voltage by arranging a primary side power supply conversion circuit, and converts the alternating-current voltage into a direct-current voltage through a secondary side rectifying and filtering circuit, wherein the direct-current voltage respectively supplies power to two parts: the first part reduces the voltage through the Buck circuit to supply power for the battery charging circuit, and the battery charging circuit carries out constant-current and constant-voltage charging on the battery; the second part provides constant current driving for the LED through a conventional Boost circuit in a conventional mode, and the lithium battery provides constant power driving for the LED lamp through the emergency Boost circuit when the emergency state is entered; the emergency switching judging circuit detects the current state to realize the switching of the constant current LED driving and emergency lighting modes in the conventional mode.

Description

Constant-current LED driving circuit integrating emergency lighting

Technical Field

The invention relates to an LED driving circuit, in particular to a constant-current LED driving circuit integrating emergency lighting.

Background

The emergency lighting is started due to the failure of a power supply of normal lighting, and is realized by using an independent emergency lighting controller and an independent LED drive at present, so that the occupied space of hardware is large, circuit wiring is complex and the cost is high on the lamp assembly.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: a constant current LED drive circuit integrating emergency lighting is provided.

In order to solve the technical problems, the invention adopts the following technical scheme:

a constant-current LED driving circuit integrating emergency lighting comprises a primary side power supply conversion circuit, a secondary side rectifying circuit, a Buck circuit, a battery charging circuit, an emergency Boost circuit, an emergency switching judging circuit and a conventional Boost circuit;

The output end of the primary side power supply conversion circuit is electrically connected with the input end of the secondary side rectifying circuit, the output end of the secondary side rectifying circuit is electrically connected with the input end of the Buck circuit, the output end of the Buck circuit is electrically connected with the input end of the battery charging circuit, the output end of the battery charging circuit is electrically connected with the input end of the emergency switching judging circuit, and the output end of the emergency switching judging circuit is electrically connected with the input end of the conventional Boost circuit.

The invention has the beneficial effects that:

The primary side power supply conversion circuit is arranged to rectify and output the input alternating voltage after filtering and rectifying the power factor, the alternating voltage is converted into direct voltage through the secondary side rectifying and filtering circuit, and the direct voltage supplies power to two parts: the first part reduces the voltage through the Buck circuit to supply power for the battery charging circuit, and the battery charging circuit carries out constant-current and constant-voltage charging on the battery; the second part provides constant current driving for the LED through a conventional Boost circuit in a conventional mode, and the lithium battery provides constant power driving for the LED lamp through the emergency Boost circuit when the emergency state is entered; the emergency switching judging circuit detects the current state to realize the switching of the constant current LED driving and emergency lighting modes in the conventional mode.

Drawings

FIG. 1 is a block diagram of the overall circuit module of a constant current LED driver circuit for integrated emergency lighting according to the present invention;

FIG. 2 is a schematic circuit diagram of a primary side power conversion circuit of a constant current LED driver circuit for integrated emergency lighting according to the present invention;

FIG. 3 is a schematic circuit diagram of a secondary side rectifier circuit of a constant current LED driver circuit incorporating emergency lighting according to the present invention;

FIG. 4 is a schematic circuit diagram of a Buck circuit of a constant current LED driver circuit for integrated emergency lighting according to the present invention;

FIG. 5 is a schematic circuit diagram of a battery charging circuit of a constant current LED driver circuit incorporating emergency lighting according to the present invention;

FIG. 6 is a schematic circuit diagram of an emergency Boost circuit incorporating an emergency lighting constant current LED driver circuit in accordance with the present invention;

FIG. 7 is a schematic circuit diagram of an emergency switching decision circuit and a conventional Boost circuit of a constant current LED driver circuit incorporating emergency lighting according to the present invention;

description of the reference numerals:

1. EMC filtering rectification circuit; 2. a PSR circuit; 3. a secondary side rectifying circuit; 4. a Buck circuit; 5. a battery charging circuit; 6, an emergency Boost circuit; 7. an emergency switching judgment circuit; 8. conventional Boost circuits.

Detailed Description

In order to describe the technical contents, the achieved objects and effects of the present invention in detail, the following description will be made with reference to the embodiments in conjunction with the accompanying drawings.

Referring to fig. 1, the present invention provides the following technical solutions:

From the above description, the beneficial effects of the invention are as follows:

Further, the primary side power supply conversion circuit comprises an EMC filtering rectification circuit and a PSR circuit, wherein the output end of the EMC filtering rectification circuit is electrically connected with the input end of the PSR circuit, and the output end of the PSR circuit is electrically connected with the input end of the secondary side rectification circuit.

As is apparent from the above description, the EMC filter rectifying circuit filters and rectifies an input ac voltage and supplies power to the PSR circuit, and the PSR circuit can transmit energy to the secondary side rectifying and rectifying circuit through the isolation transformer in addition to power factor correction, and converts the energy into a dc voltage through the secondary side rectifying and rectifying circuit.

Further, the EMC filter rectifying circuit includes a rectifier bridge DB1, a capacitor C2, an X capacitor CX1, a Y capacitor CY2, a Y capacitor CY3, a varistor RV1, a magnetic induction coil L3, a transformer T1, a transformer T2, a fuse resistor F1 and a socket CON1;

The power strip CON1 comprises a first pin, a second pin and a third pin, the first end of the rectifying bridge DB1 is electrically connected with one end of a primary winding of the transformer T2, the other end of the primary winding of the transformer T2 is electrically connected with one end of the Y capacitor CY2, one end of the X capacitor CX1 and one end of the primary winding of the transformer T1 respectively, the other end of the primary winding of the transformer T1 is electrically connected with one end of the piezoresistor RV1 and one end of the safety resistor F1 respectively, the other end of the safety resistor F1 is electrically connected with the second pin of the power strip CON1, the first pin of the power strip CON1 is electrically connected with one end of a secondary winding of the transformer T1 respectively, the other end of the secondary winding of the transformer T1 is electrically connected with the other end of the X capacitor CX1, one end of the secondary winding of the Y capacitor CX1 and one end of the secondary winding of the transformer T2 respectively, the other end of the secondary winding of the transformer T2 is electrically connected with the second end of the piezoresistor RV1 and one end of the safety resistor F1 respectively, the other end of the rectifying bridge DB1 is electrically connected with the second end of the rectifying bridge CON1 and the other end of the C1, the other end of the rectifying bridge C2 is electrically connected with the third end of the inductor C1 and the inductor C2C1 respectively, and the other end of the end of C2C1 is electrically connected with the other end of the inductor C1 and the end of C1 respectively, and the end of C1 is electrically connected with the end of C3 and C1 and the inductor C1 respectively.

As can be seen from the above description, the safety resistor F1 provides abnormal protection for the power supply, the X capacitor CX1 is an EMC differential mode filter, and the magnetic induction coil L3, the capacitor C1 and the capacitor C2 are configured to form an EMC differential mode pi-type filter circuit for filtering differential mode interference; the Y capacitor CY1, the Y capacitor CY2, the transformer T1 and the transformer T2 form an EMC common mode filtering circuit for filtering common mode interference, and the input alternating current is converted into direct current voltage through the rectifier bridge DB 1.

Further, the PSR circuit includes a chip U1, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a resistor R39, a resistor R42, a resistor R43, a capacitor C5, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C12, a Y capacitor CY1, an electrolytic capacitor CE1, a diode D2, a diode D4, a magnetically induced coil TR1A, a magnetically induced coil TR1B, and a field effect transistor Q2;

The chip U1 comprises a first pin, a second pin, a third pin, a fourth pin, a fifth pin and a sixth pin, the first pin of the chip U1 is electrically connected with one end of the resistor R8, one end of the resistor R9, one end of the resistor R10 and one end of the capacitor C8, the second pin of the chip U2 is electrically connected with one end of the capacitor C5, one end of the resistor R9, one end of the resistor R10 and the other end of the capacitor C8 respectively, the second pin of the chip U1, one end of the capacitor C5, one end of the resistor R9, one end of the resistor R10 and the other end of the capacitor C8 are all grounded, and the third pin of the chip U1 is respectively connected with the other end of the capacitor C5, The cathode of the diode D2, one end of the electrolytic capacitor CE1 and one end of the resistor R12 are electrically connected, the other end of the resistor R12 is electrically connected with one end of the resistor R11, the other end of the resistor R11 is electrically connected with one end of the resistor R1, one end of the resistor R42, one end of the capacitor C12, one end of the Y capacitor CY1 and one end of the magnetic induction coil TR1A respectively, the other end of the Y capacitor CY1 is grounded, the other end of the resistor R1 is electrically connected with the other end of the resistor R42, one end of the resistor R43 and one end of the resistor R39 respectively, and the other end of the resistor R43 is electrically connected with the other end of the resistor R39, the other end of the capacitor C12, one end of the resistor R5 and one end of the resistor R6 are electrically connected, the other end of the resistor R5 is electrically connected with the other end of the resistor R6 and the cathode of the diode D1, the anode of the diode D1 is electrically connected with the other end of the magnetic induction coil TR1A, the source of the field effect tube Q2 and one end of the capacitor C7, the drain of the field effect tube Q2 is electrically connected with the other end of the capacitor C7, one end of the resistor R19, one end of the resistor R20, one end of the resistor R18, one end of the resistor R17 and one end of the resistor R21, the other end of the resistor R20 is electrically connected with the other end of the resistor R19 and the other end of the resistor R18 respectively, and the other end of the resistor R20, The other end of the resistor R19 and the other end of the resistor R18 are grounded, the grid electrode of the field effect transistor Q2 is respectively and electrically connected with one end of the resistor R21, the anode of the diode D4 and one end of the resistor R16, the cathode of the diode D4 is respectively and electrically connected with the other end of the resistor R16 and one end of the resistor R15, the other end of the resistor R15 is electrically connected with the fourth pin of the chip U1, the fifth pin of the chip U1 is respectively and electrically connected with one end of the capacitor C11 and the other end of the resistor R17, the sixth pin of the chip U1 is respectively and electrically connected with one end of the resistor R14 and one end of the capacitor C9, The other end of the capacitor C9 is electrically connected with the other end of the capacitor C10 and the other end of the capacitor C11 respectively, the other end of the capacitor C9, the other end of the capacitor C10 and the other end of the capacitor C11 are all grounded, the other end of the resistor R8 is electrically connected with one end of the resistor R7 and one end of the magnetic induction coil RT1B respectively, the other end of the magnetic induction coil RT1B is electrically connected with the other end of the electrolytic capacitor CE1, the other end of the magnetic induction coil RT1B and the other end of the electrolytic capacitor CE1 are all grounded, and the other end of the resistor R7 is electrically connected with the anode of the diode D2.

As can be seen from the above description, the control chip U1 outputs a PWM square wave to control the switching of the fet Q2, and when the fet Q2 is turned on, the current rises according to a certain slope, and the transformer TR1 stores energy; when the field effect transistor Q2 is turned off, the transformer TR1 provides energy for the secondary side and the auxiliary winding, and meanwhile, the chip U1 improves active power and reduces harmful odd harmonics through a constant conduction control scheme. Resistor R7, diode D2, electrolytic capacitor CE1, and capacitor C5 provide VCC voltage for chip U1. The resistor R1, the resistor R5, the resistor R6, the resistor R39, the resistor R42, the resistor R43, the capacitor C12 and the diode D1 form a peak absorption circuit, so that the voltage stress of the field effect transistor Q2 is reduced, and EMC interference is improved; the resistor R18, the resistor R19 and the resistor R20 sample the current signal of the field effect transistor Q1 to provide overcurrent protection for the PSR circuit; the magnetic induction coil TR1B, the resistor R8, the resistor R9, the resistor R10 and the capacitor C8 form a voltage dividing circuit, and compared with the reference voltage in the chip U1, the control of primary side feedback to secondary side output voltage is realized, a secondary side feedback element and an optocoupler are eliminated by the PSR circuit, and the circuit is simplified and the cost is reduced.

Further, the secondary rectifying circuit includes a resistor R2, a resistor R3, a resistor R105, a resistor R106, a resistor R107, a resistor R110, a capacitor C14, a capacitor C35, an electrolytic capacitor CE2, an electrolytic capacitor CE3, an electrolytic capacitor CE9, an electrolytic capacitor CE10, a diode D17, a magnetic induction coil TR1C, and a magnetic induction coil TR1D;

One end of the electrolytic capacitor CE2 is electrically connected to one end of the diode D10, one end of the capacitor C14, one end of the electrolytic capacitor CE9, one end of the electrolytic capacitor CE10, one end of the resistor R105, one end of the resistor R106, and one end of the resistor R107, the other end of the resistor R107 is grounded, one end of the resistor R106, the other end of the resistor R105, the other end of the electrolytic capacitor CE10, the other end of the electrolytic capacitor CE9, the other end of the electrolytic capacitor CE2, one end of the electrolytic capacitor CE3, one end of the capacitor C35, one end of the magnetic induction coil TR1C, one end of the magnetic induction coil TR1D, one end of the resistor R107, the other end of the resistor R105, the other end of the electrolytic capacitor CE10, the other end of the electrolytic capacitor CE9, the other end of the electrolytic capacitor CE2, one end of the electrolytic capacitor CE3, one end of the capacitor C35, one end of the magnetic induction coil TR1C, one end of the magnetic induction coil TR1D, one end of the anode 1D, one end of the resistor R110, one end of the diode C2, the other end of the diode C17, the other end of the diode C2, and the other end of the resistor C3D 3, and the other end of the resistor C3 are electrically connected.

As can be seen from the above description, output rectification and filtering are achieved by providing the magnetic induction coil TR1C, the diode D10, the electrolytic capacitor CE2, the electrolytic capacitor CE9, and the electrolytic capacitor CE10, and the magnetic induction coil TR1D, the resistor R110, the diode D17, and the electrolytic capacitor CE3 provide the sec_vcc voltage (secondary side auxiliary dc voltage) for the secondary side control circuit; the resistor R2, the resistor R3 and the capacitor C14 form a peak absorption circuit for reducing the voltage stress of the diode D10 and improving the EMC interference of the LED driving circuit.

Further, the Buck circuit includes a chip U4, a resistor R13, a resistor R23, a resistor R24, a resistor R26, a resistor R29, a resistor R95, a resistor R96, a capacitor C2, a capacitor C13, a capacitor C16, a capacitor C36, an electrolytic capacitor CE4, a diode D13, and an inductor L4;

The chip U4 comprises a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin and a seventh pin, the first pin of the chip U4 is respectively and electrically connected with one end of the capacitor C13 and one end of the resistor R13, the other end of the resistor R13 is respectively and electrically connected with the fifth pin of the chip U4, one end of the resistor R23, one end of the capacitor C36 and one end of the resistor R24, the other end of the capacitor C36 is respectively and electrically connected with the other end of the resistor R23, one end of the capacitor C2, the third pin of the chip U4 and the other end of the capacitor C13, the other end of the capacitor C36, one end of the resistor R23, the third pin of the chip U4 and the other end of the capacitor C13 are all grounded, the other end of the capacitor C2 is electrically connected with the sixth pin of the chip U4, the second pin of the chip U4 is electrically connected with one end of the resistor R96, the cathode of the diode D13 and one end of the inductor L4, the other end of the inductor L4 is electrically connected with one end of the electrolytic capacitor CE4, one end of the capacitor C3 and one end of the resistor R26, the other end of the resistor R26 is electrically connected with one end of the resistor R95 and one end of the resistor R29, the other end of the resistor R29 is grounded, the other end of the resistor R95 is electrically connected with the seventh pin of the chip U4, the anode of the diode D13 is electrically connected with the other end of the electrolytic capacitor CE4 and the other end of the capacitor C3, the anode of the diode D13, the other end of the electrolytic capacitor CE4 and the other end of the capacitor C3 are all grounded, the fourth pin of the chip U4 is electrically connected with one end of the capacitor C16, and the other end of the capacitor C16 is electrically connected with the other end of the resistor R96.

As can be seen from the above description, when the MOS transistor inside the chip U4 is turned on, the dc voltage VOUT provides the MOS transistor inside the chip U4 and the inductor L4 to provide energy for output, the current rises according to a certain slope, the inductor L4 stores energy, when the MOS transistor inside the chip U4 is turned off, the polarity of the inductor L4 is reversed, the freewheeling current provides energy for output through the diode D13 and the electrolytic capacitor CE4, the current drops according to a certain slope, and the inductor L4 releases energy; and R26, R29 and R95 are used for carrying out partial pressure sampling on the output voltage, and comparing the output voltage with the internal reference of U4, controlling the MOS switch in U4 and realizing constant voltage output. The resistor R13, the resistor R23 and the capacitor C36 form a voltage dividing circuit, and compared with the internal reference of the chip U4, the chip U4 is controlled to be enabled; when the switch is closed, the fifth pin of the chip U4 is lower than the internal reference, the chip U4 stops working, the BAT_VCC voltage (direct current voltage after Buck conversion of the Buck circuit) is reduced, the detection is carried out through the emergency switching judging circuit, the driving is carried out in an emergency mode, after the switch is opened, the driving is carried out in a normal mode, and the function manually checks whether the emergency function is normal or not.

Further, the battery charging circuit comprises a chip U5, a resistor R34, a capacitor C17, a capacitor C18, a diode D11, a diode D12 and a safety resistor F2;

The chip U5 comprises a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin, a seventh pin and an eighth pin, the first pin of the chip U5 is electrically connected with the third pin of the chip U5, one end of a resistor R34, one end of a capacitor C17 and one end of a capacitor C18, the first pin of the chip U5, the third pin of the chip U5, one end of the resistor R34, one end of the capacitor C17 and one end of the capacitor C18 are all grounded, the other end of the resistor R34 is electrically connected with the second pin of the chip U5, the other end of the capacitor C17 is electrically connected with the fourth pin of the chip U5, the fifth pin of the chip U5 is electrically connected with the other end of the capacitor C18 and one end of a safety resistor F2, the other end of the safety resistor F2 is electrically connected with the eighth pin of the chip U5, the sixth pin of the chip U5 is electrically connected with the cathode of the diode D12, and the seventh pin of the chip U5 is electrically connected with the anode of the diode D11.

As can be seen from the above description, the chip U6 is a lithium battery charging protection chip, performing constant current and constant voltage charging management for a single lithium battery, and if the voltage of the eighth pin (battery voltage detection input terminal) of the chip U6 is lower than 2.5V, the charger precharges the battery with a small current; when the voltage of the battery voltage detection input end exceeds 2.5V, the charger charges the battery in a constant current mode; the charging current is determined by resistor R34; when the voltage of the battery voltage detection input end is close to the battery end modulation voltage, the charging current is gradually reduced, and the chip U6 enters a constant-voltage charging mode; when the charging current is reduced to a charging end threshold value, the charging period is ended, and the safety resistor F2 provides abnormal protection for battery charging; the diode D11, the diode D12 and the LED lamp provide battery charge indication status; when the LED is normally charged, the seventh pin of the chip U6 is in a low configuration, the sixth pin of the chip U6 is in a high configuration, and the LED emits light (charges normally); in the abnormal state, the seventh pin of the chip U6 and the sixth pin of the chip U6 are both in a high configuration, and the LED does not emit light (charge abnormality).

Further, the emergency Boost circuit comprises a chip U2, a resistor R28, a resistor R52, a resistor R53, a resistor R55, a resistor R56, a resistor R58, a resistor R63, a resistor R66, a resistor R67, a resistor R68, a resistor R71, a resistor R72, a resistor R75, a resistor R79, a resistor R80, a resistor R89, an electrolytic capacitor CE5, an electrolytic capacitor CE7, a diode D16, a diode D15, a diode D19, a diode D20, a voltage stabilizing diode DZ4, a triode Q7, a triode Q9, a triode Q10, a triode Q5, a triode Q11, a triode Q12 and a field effect transistor Q13;

The chip U2 comprises a first pin, a second pin and a third pin, the first pin of the chip U2 is respectively and electrically connected with one end of the resistor R89, the emitter of the triode Q12, one end of the resistor R79, one end of the electrolytic capacitor CE7, the emitter of the triode Q11, one end of the resistor R75, one end of the resistor R80 and the emitter of the triode Q10, the first pin of the chip U2, one end of the resistor R89, the emitter of the triode Q12, one end of the resistor R79, one end of the electrolytic capacitor CE7, the emitter of the triode Q11, one end of the resistor R75, one end of the resistor R80 and the emitter of the triode Q10 are all grounded, the third pin of the chip U2 is electrically connected with one end of the resistor R72, the other end of the resistor R72 is respectively and electrically connected with the other end of the resistor R79, one end of the resistor R67 and the collector of the triode Q12, the base electrode of the triode Q12 is respectively and electrically connected with the other end of the resistor R89 and the anode electrode of the voltage stabilizing diode DZ4, the second pin of the chip U2 is electrically connected with one end of the resistor R66, the other end of the resistor R66 is respectively and electrically connected with one end of the resistor R56, the base electrode of the triode Q9 and the collector electrode of the triode Q7, the collector electrode of the triode Q9 is respectively and electrically connected with the anode electrode of the diode D20, one end of the resistor R68 and one end of the resistor R80, the emitter electrode of the triode Q9 is respectively and electrically connected with the other end of the resistor R56, the emitter electrode of the triode Q7, one end of the electrolytic capacitor CE5, the emitter electrode of the triode Q5, one end of the resistor R53 and the source electrode of the field effect transistor Q13, the other end of the resistor R53 is respectively and electrically connected with the collector electrode of the triode Q10, one end of the resistor R28 and the grid electrode of the field effect transistor Q13, the other end of the resistor R28 is electrically connected with the base electrode of the triode Q5, the other end of the resistor R68 is electrically connected with the base of the triode Q10, the base of the triode Q7 is electrically connected with the other end of the electrolytic capacitor CE5, one end of the resistor R52 and one end of the resistor R55 respectively, the other end of the resistor R52 is electrically connected with the anode of the diode D15, the cathode of the diode D15 is electrically connected with the other end of the resistor R55, the collector of the triode Q11 and one end of the resistor R58 respectively, the other end of the resistor R58 is electrically connected with the cathode of the diode D19, the other end of the diode D19 is electrically connected with one end of the resistor R63 and the anode of the diode D16 respectively, the cathode of the diode D16 is electrically connected with the other end of the electrolytic capacitor CE7, the other end of the resistor R67 and the cathode of the diode D20 respectively, the other end of the resistor R63 is electrically connected with one end of the resistor R71 and the other end of the resistor R75 respectively, and the other end of the resistor R71 is electrically connected with the base of the triode Q11.

Further, the conventional Boost circuit comprises a chip U8, a resistor R33, a resistor R35, a resistor R37, a resistor R38, a resistor R44, a resistor R70, a resistor R85, a resistor R88, a resistor R91, a capacitor C4, a capacitor C6, a capacitor C15, a capacitor C20, an inductor L8 and a field effect transistor Q6;

The chip U8 comprises a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin and a seventh pin, the first pin of the chip U8 is electrically connected with one end of the capacitor C4, the other end of the capacitor C4 is electrically connected with one end of the capacitor C15 and the third pin of the chip U8 respectively, the other end of the capacitor C4, one end of the capacitor C15 and the third pin of the chip U8 are grounded, the other end of the capacitor C15 is electrically connected with one end of the fourth pin of the chip U8 and one end of the resistor R37 respectively, the other end of the resistor R37 is electrically connected with one end of the resistor R35, one end of the resistor R44, one end of the resistor R70 and the source electrode of the field effect transistor Q6 respectively, the other end of the resistor R35 is electrically connected with one end of the resistor R33 and the grid electrode of the field effect transistor Q6 respectively, the drain electrode of the field effect transistor Q6 is electrically connected with one end of the inductor L8 and one end of the diode D5 respectively, the other end of the resistor C33 is electrically connected with one end of the capacitor C8 and one end of the other end of the resistor C8 respectively, the other end of the resistor R33 is electrically connected with one end of the resistor C8 and the other end of the resistor C8, the other end of the resistor C20 is electrically connected with the other end of the resistor C8, one end of the resistor C8 is electrically connected with the other end of the resistor C8 and the other end of the resistor C8 is electrically connected with the other end of the resistor C8, the resistor C8 is electrically connected with the resistor C20, the other end of the resistor is electrically connected with the other end of the resistor C8, the end of the resistor is electrically connected with the resistor, the end, the resistor is electrically has the resistor, the capacitor, and the capacitor and the ground.

As can be seen from the above description, the chip U8 outputs a PWM square wave to control the switching of the fet Q6, and the secondary side rectifies and filters the dc voltage VOUT to provide constant current driving for the LED through the inductor L8, fet Q6, diode D5, and electrolytic capacitor CE6 power devices; the resistor R59, the resistor R64 and the resistor R22 sample output current to realize constant current output; resistor R38, resistor R44 and resistor R70 sample the current signal of FET Q6 to provide over-current protection for the LED drive circuit.

Further, the emergency switching judging circuit comprises a resistor R36, a resistor R51, a resistor R99, a resistor R100, a resistor R101, a capacitor C21, a diode D9, a triode Q15 and a triode Q16;

One end of the resistor R100 is respectively and electrically connected with one end of the resistor R99, one end of the resistor R101 and one end of the capacitor C21, the other end of the capacitor C21 is respectively and electrically connected with the other end of the resistor R101 and the emitter of the triode Q16, the other end of the capacitor C21, the other end of the resistor R101 and the emitter of the triode Q16 are grounded, the base of the triode Q16 is electrically connected with the other end of the resistor R100, the collector of the triode Q16 is respectively and electrically connected with one end of the resistor R36 and one end of the resistor R51, the other end of the resistor R51 is electrically connected with the base of the triode Q15, the emitter of the triode Q15 is electrically connected with the other end of the resistor R36, and the other end of the resistor R99 is electrically connected with the cathode of the diode D9.

Referring to fig. 1 to 7, a first embodiment of the present invention is as follows:

referring to fig. 1, a constant current LED driving circuit for integrated emergency lighting includes a primary power conversion circuit, a secondary rectification circuit 3, a Buck circuit 4, a battery charging circuit 5, an emergency Boost circuit 6, an emergency switching judgment circuit 7 and a conventional Boost circuit 8;

The output end of the primary side power supply conversion circuit is electrically connected with the input end of the secondary side rectification circuit 3, the output end of the secondary side rectification circuit 3 is electrically connected with the input end of the Buck circuit 4, the output end of the Buck circuit 4 is electrically connected with the input end of the battery charging circuit 5, the output end of the battery charging circuit 5 is electrically connected with the input end of the emergency switching judgment circuit 7, and the output end of the emergency switching judgment circuit 7 is electrically connected with the input end of the conventional Boost circuit 8.

The primary side power supply conversion circuit comprises an EMC filtering rectification circuit 1 and a PSR circuit 2, wherein the output end of the EMC filtering rectification circuit 1 is electrically connected with the input end of the PSR circuit 2, and the output end of the PSR circuit 2 is electrically connected with the input end of the secondary side rectification circuit 3.

Referring to fig. 2, the EMC filter rectifying circuit 1 includes a rectifier bridge DB1, a capacitor C2, an X capacitor CX1, a Y capacitor CY2, a Y capacitor CY3, a varistor RV1, a magnetic induction coil L3, a transformer T1, a transformer T2, a fuse resistor F1 and a power strip CON1;

Referring to figure 2 of the drawings in which, the PSR circuit 2 comprises a chip U1 (model OB 3636), a resistor R1 (with a resistance value of 240KΩ), a resistor R5 (with a resistance value of 20 Ω), a resistor R6 (with a resistance value of 4.7KΩ), a resistor R8 (with a resistance value of 15KΩ), a resistor R9 (with a resistance value of 270KΩ), a resistor R10 (with a resistance value of 2.4KΩ), a resistor R11 (with a resistance value of 470KΩ), a resistor R12 (with a resistance value of 470KΩ), a resistor R14 (with a resistance value of 10KΩ), a resistor R15 (with a resistance value of 20 Ω), a resistor R16 (with a resistance value of 100 Ω), a resistor R17 (with a resistance value of 0 Ω), a resistor R18 (with a resistance value of 0.7 KΩ), a resistor R19 (with a resistance value of 0.0.4 KΩ) resistor R20 (resistance value 0.75Ω), resistor R21 (resistance value 10KΩ), resistor R39 (resistance value 240KΩ), resistor R42 (resistance value 240KΩ), resistor R43 (resistance value 240KΩ), capacitor C5 (capacitance value 100 nF), capacitor C7 (capacitance value 22 pF), capacitor C8 (capacitance value 33 pF), capacitor C9 (capacitance value 470 nF), capacitor C10 (capacitance value 1 uF), capacitor C11 (capacitance value 22 pF), capacitor C12 (capacitance value 1 nF), capacitor CY1 (capacitance value 2200 pF), electrolytic capacitor CE1 ((capacitance value 2.2 uF)), diode D1 (model RS 2M), diode D2 (model ES 1J), diode D4 (model 1N4148 WS), magnetic induction coil TR1A (model PQ 2615), magnetic induction coil TR1B (model PQ 2615)), and field effect transistor Q2 (model IPD80R1K0 CE);

Referring to fig. 3, the secondary rectifying circuit 3 includes a resistor R2 (having a resistance value of 47 Ω), a resistor R3 (having a resistance value of 47 Ω), a resistor R105 (having a resistance value of 10kΩ), a resistor R106 (having a resistance value of 10kΩ), a resistor R107 (having a resistance value of 10kΩ), a resistor R110 (having a resistance value of 4.7Ω), a capacitor C14 (having a capacitance value of 100 pF), a capacitor C35 (having a capacitance value of 100 nF), an electrolytic capacitor CE2 (having a capacitance value of 560 uF), an electrolytic capacitor CE3 (having a capacitance value of 470 uF), an electrolytic capacitor CE9 (having a capacitance value of 560 uF), an electrolytic capacitor CE10 (having a capacitance value of 560 uF), a diode D10 (model MBR20200 CT), a diode D17 (model ES 1J), a magnetic induction coil TR1C (model PQ 2615), and a magnetic induction coil TR1D (model PQ 2615).

Referring to fig. 4, the Buck circuit 4 includes a chip U4 (model MP 9942), a resistor R13 (resistance 365kΩ), a resistor R23 (resistance 27kΩ), a resistor R24 (resistance 27kΩ), a resistor R26 (resistance 51kΩ), a resistor R29 (resistance 10kΩ), a resistor R95 (resistance 51kΩ), a resistor R96 (resistance 20 Ω), a capacitor C2 (capacitance 100 nF), a capacitor C3 (capacitance 100 nF), a capacitor C13 (capacitance 100 nF), a capacitor C16 (capacitance 100 nF), a capacitor C36 (capacitance 100 nF), an electrolytic capacitor CE4 (capacitance 100 uF), a diode D13 (model SS 24A), and an inductor L4 (inductance 10 uH);

Referring to fig. 5, the battery charging circuit 5 includes a chip U5 (model CN 3058), a resistor R34 (with a resistance value of 4.22kΩ), a capacitor C17 (with a capacitance value of 1 uF), a capacitor C18 (with a capacitance value of 4.7 uF), a diode D11 (model 1N4148 WS), a diode D12 (model 1N4148 WS), and a fuse resistor F2 (model 2010T, with a current value of 2A and a voltage value of 250V);

Referring to figure 6 of the drawings in which, the emergency Boost circuit 6 includes a chip U2 (model number TLVH K AQDBZR), a resistor R28 (resistance number 1K Ω), a resistor R52 (resistance number 330K Ω), a resistor R53 (resistance number 2.7K Ω), a resistor R55 (resistance number 100K Ω), a resistor R56 (resistance number 5.1K Ω), a resistor R58 (resistance number 100K Ω), a resistor R63 (resistance number 5.1K Ω), a resistor R66 (resistance number 1K Ω), a resistor R67 (resistance number 3.9K Ω), a resistor R68 (resistance number 1K Ω), a resistor R71 (resistance number 5.1K Ω), a resistor R72 (resistance number 1K Ω), a resistor R75 (resistance number 5.1K Ω), a resistor R79 (resistance number 5.1K Ω), a resistor R80 (resistance number 2.7K Ω), a resistor R89 (resistance number 2.7K Ω), an electrolytic capacitor CE5 (capacitance number 47 ubc), an electrolytic capacitor CE7 (BC 7), a capacitor CE 16D (model number 16D 6Q 5Q 7), a transistor Q5 (model number Q5Q 7), a transistor Q5Q 6 (model number Q5Q 6), a transistor Q5Q 6, a transistor Q6 (model number Q5Q) and a transistor Q5 (model number Q7);

Referring to fig. 7, the conventional Boost circuit 8 includes a chip U8 (model OB 3350), a resistor R33 (with a resistance value of 10Ω), a resistor R35 (with a resistance value of 10kΩ), a resistor R37 (with a resistance value of 1kΩ), a resistor R38 (with a resistance value of 0.39Ω), a resistor R44 (with a resistance value of 0.39Ω), a resistor R70 (with a resistance value of 0.39Ω), a resistor R85 (with a resistance value of 100deg.Ω), a resistor R88 (with a resistance value of 10kΩ), a resistor R91 (with a resistance value of 24kΩ), a capacitor C4 (with a capacitance value of 100 nF), a capacitor C6 (with a capacitance value of 33 nF), a capacitor C15 (with a capacitance value of 1 nF), a capacitor C20 (with a capacitance value of 1 nF), an inductor L8 (with an inductance value of 33 uH), and a field effect transistor Q6 (model AOD 4286);

Referring to fig. 7, the emergency switching determination circuit 7 includes a resistor R36 (having a resistance value of 27kΩ), a resistor R51 (having a resistance value of 10kΩ), a resistor R99 (having a resistance value of 39kΩ), a resistor R100 (having a resistance value of 1kΩ), a resistor R101 (having a resistance value of 10kΩ), a capacitor C21 (having a capacitance value of 4.7 uF), a diode D9 (model 1N4148 WS), a transistor Q15 (model BC 857B), and a transistor Q16 (model BC 847B);

Referring to fig. 2 to 7, the working principle of the constant current LED driving circuit for integrated emergency lighting is as follows:

The safety resistor F1 provides abnormal protection for a power supply, the X capacitor CX1 is EMC differential mode filtering, and an EMC differential mode pi-type filtering circuit is formed by arranging the magnetic induction coil L3, the capacitor C1 and the capacitor C2 and is used for filtering differential mode interference; the Y capacitor CY1, the Y capacitor CY2, the transformer T1 and the transformer T2 form an EMC common mode filtering circuit for filtering common mode interference, and the input alternating current is converted into direct current voltage through the rectifier bridge DB 1.

The control chip U1 outputs a PWM square wave to control the switch of the field effect transistor Q2, when the field effect transistor Q2 is conducted, the current rises according to a certain slope, and the transformer TR1 stores energy; when the field effect transistor Q2 is turned off, the transformer TR1 provides energy for the secondary side and the auxiliary winding, and meanwhile, the chip U1 improves active power and reduces harmful odd harmonics through a constant conduction control scheme. Resistor R7, diode D2, electrolytic capacitor CE1, and capacitor C5 provide VCC voltage for chip U1. The resistor R1, the resistor R5, the resistor R6, the resistor R39, the resistor R42, the resistor R43, the capacitor C12 and the diode D1 form a peak absorption circuit, so that the voltage stress of the field effect transistor Q2 is reduced, and EMC interference is improved; the resistor R18, the resistor R19 and the resistor R20 sample the current signal of the field effect transistor Q1 to provide overcurrent protection for the PSR circuit 2; the magnetic induction coil TR1B, the resistor R8, the resistor R9, the resistor R10 and the capacitor C8 form a voltage dividing circuit, and compared with the reference voltage in the chip U1, the control of primary side feedback to secondary side output voltage is realized, the secondary side feedback element and the optocoupler are eliminated by the PSR circuit 2, and the circuit is simplified and the cost is reduced.

Output rectification and filtering are realized by arranging a magnetic induction coil TR1C, a diode D10, an electrolytic capacitor CE2, an electrolytic capacitor CE9 and an electrolytic capacitor CE10, and the magnetic induction coil TR1D, a resistor R110, a diode D17 and an electrolytic capacitor CE3 provide SEC_VCC voltage for a secondary side control circuit; the resistor R2, the resistor R3 and the capacitor C14 form a peak absorption circuit for reducing the voltage stress of the diode D10 and improving the EMC interference of the LED driving circuit.

When the MOS tube inside the chip U4 is conducted, the direct-current voltage VOUT provides energy for output through the MOS tube inside the chip U4 and the inductor L4, current rises according to a certain slope, the inductor L4 stores energy, when the MOS tube inside the chip U4 is cut off, the polarity of the inductor L4 is reversed, the energy is provided for output through the diode D13 and the electrolytic capacitor CE4 in a freewheeling mode, the current drops according to a certain slope, and the inductor L4 releases energy; and R26, R29 and R95 are used for carrying out partial pressure sampling on the output voltage, and comparing the output voltage with the internal reference of U4, controlling the MOS switch in U4 and realizing constant voltage output. The resistor R13, the resistor R23 and the capacitor C36 form a voltage dividing circuit, and compared with the internal reference of the chip U4, the chip U4 is controlled to be enabled; when the switch is closed, the fifth pin of the chip U4 is lower than the internal reference, the chip U4 stops working, the BAT_VCC is reduced, the detection is carried out through the emergency switching judging circuit 7, the driving is carried out in an emergency mode, after the switch is opened, the driving is carried out in a conventional mode, and whether the emergency function is normal or not is manually checked by the function.

The chip U6 is a lithium battery charging protection chip, constant-current and constant-voltage charging management is carried out on a single lithium battery, and if the voltage of an eighth pin (a battery voltage detection input end) of the chip U6 is lower than 2.5V, the battery is precharged by a small current; when the voltage of the battery voltage detection input end exceeds 2.5V, the charger charges the battery in a constant current mode; the charging current is determined by resistor R34; when the voltage of the battery voltage detection input end is close to the battery end modulation voltage, the charging current is gradually reduced, and the chip U6 enters a constant-voltage charging mode; when the charging current is reduced to a charging end threshold value, the charging period is ended, and the safety resistor F2 provides abnormal protection for battery charging; the diode D11, the diode D12 and the LED lamp provide battery charge indication status; when the LED is normally charged, the seventh pin of the chip U6 is in a low configuration, the sixth pin of the chip U6 is in a high configuration, and the LED emits light (charges normally); in the abnormal state, the seventh pin of the chip U6 and the sixth pin of the chip U6 are both in a high configuration, and the LED does not emit light (charge abnormality).

In an emergency mode, the field effect transistor Q13 and the triode Q5 are conducted, a PWM square wave is output through the chip U7 to control the switch of the field effect transistor Q3, when the field effect transistor Q3 is conducted, the current of the inductor L6 rises according to a certain slope, and the inductor L6 stores energy; when the field effect transistor Q3 is turned off, the lithium battery provides constant power driving for the LED lamp through the inductor L6, the field effect transistor Q3, the diode D18 and the electrolytic capacitor CE6 power device, the current of the inductor L6 is reduced according to a certain slope, and the inductor L6 releases energy. The resistor R59, the resistor R64 and the resistor R22 convert input current into sampling voltage, and after the sampling voltage is amplified by an amplifying circuit (comprising the resistor R74, the resistor R69, the resistor R81 and the chip U6), the FB pin of the chip U7 is compared with an internal reference, and the switching of the field effect transistor Q3 is controlled, so that constant power output is realized. The field effect transistor U3 is a voltage doubling chip, and is constructed into a voltage doubling circuit with the diode D8, the capacitor C31 and the electrolytic capacitor CE8 to double the voltage of the battery and supply power to the VCC pin of the chip U6 and the VIN pin of the chip U7. Resistor R61, resistor R65 and resistor R84 sample the FET Q3 current signal to provide over-current protection for the LED drive circuit. The resistor R54 and the resistor R62 divide the output voltage and then provide the divided output voltage for the voltage stabilizing diode DZ4, the resistor R89 and the triode Q12, when the output voltage exceeds a certain value, the triode Q12 is conducted and is in a saturated state, the second pin of the chip U2 is in a high potential, the triode Q9, the triode Q10 and the triode Q5 are in a cut-off state, the field effect transistor Q13 is disconnected, the emergency Boost circuit 6 stops working, and the overvoltage protection of the LED driving circuit is realized.

In a conventional mode, a PWM square wave is output through a chip U8 to control the switch of a field effect transistor Q6, and a direct current voltage VOUT after secondary side rectification and filtration is used for providing constant current drive for an LED through an inductor L8, the field effect transistor Q6, a diode D5 and an electrolytic capacitor CE6 power device; the resistor R59, the resistor R64 and the resistor R22 sample output current to realize constant current output; resistor R38, resistor R44 and resistor R70 sample the current signal of FET Q6 to provide over-current protection for the LED drive circuit. Resistor R108, resistor R109 and resistor R88 sense the output voltage and provide overvoltage protection for the LED driver circuit.

In a normal state (when mains supply is normal), the PSR circuit 2 works normally, BAT_VCC keeps normal voltage, BAT_VCC is divided by a resistor R63, a resistor R75 and a resistor R71 to supply power to the base electrode and the emitter electrode of the triode Q11, the triode Q11 works in a saturation region, the battery BAT works in the saturation region through an electrolytic capacitor CE5, a diode D15, a resistor R25, a resistor R55 and the triode Q11, the base electrode and the emitter electrode of the triode Q9 are short-circuited by the triode Q7, the triode Q9, the triode Q10 and the triode Q5 work in a cut-off region, the triode Q13 is cut off, the chip U3 is not provided with input voltage, the VCC pin of the chip U6 and the VIN pin of the chip U7 are not powered, and the two chips are not working, and the LED driving circuit stops working; meanwhile, BAT_VCC keeps normal voltage, triode Q15 and triode Q16 work in saturation region, the first pin (VIN pin) of chip U8 supplies power normally, LED drive circuit works normally, drive is in normal mode, and in this mode, LED is supplied power through LED drive circuit.

In an abnormal state (when mains supply is under-voltage or power is off), the PSR circuit 2 stops working, BAT_VCC does not have output, when BAT_VCC does not have output, the voltage at two ends of the electrolytic capacitor CE7 is unchanged due to the existence of the electrolytic capacitor CE7, and the resistance partial pressure of the resistor R67, the resistor R79 and the resistor R72 is higher than the internal reference of the chip U2, so that the second pin of the chip U2 is maintained at a low potential; in addition, when BAT_VCC has no output, the triode Q11 and the triode Q7 work in a cut-off area, the battery BAT supplies power to the base electrode and the emitter electrode of the triode Q9 through the resistor R56, the resistor R66 and the chip U2, and the triode Q9 works in a saturation area; the battery BAT supplies power to the base electrode and the emitter electrode of the triode Q10 through the triode Q9, the resistor R68 and the resistor R80, and the triode Q10 works in a saturation region; the triode Q5, the resistor R28 and the triode Q10 are conducted, and the triode Q5 works in a saturation region; in addition, the triode Q10 is conducted to pull down the grid electrode of the field effect tube Q13, the field effect tube Q13 works in a conducting state, after the battery is multiplied by the voltage of the chip U3, the VCC pin of the chip U6 and the VIN pin of the chip U7 are supplied with power, the LED driving circuit works normally, meanwhile, the BAT_VCC has no output, and the triode Q15 and the triode Q16 work in a cut-off area; the first pin (VIN pin) of the chip U8 is unpowered, the LED driver circuit is inactive, and the driver is in an emergency mode in which the battery powers the LEDs through the emergency LED driver circuit.

The emergency switching judging circuit 7 is used for judging the current commercial power state and switching between the emergency state and the normal state.

The constant-current LED driving circuit for integrating emergency lighting, which is designed by the scheme, has the following advantages:

1. The circuit can realize a drive circuit with high PF value and low harmonic wave when in full load output by arranging the PSR circuit 2, eliminates a secondary side feedback element and an optocoupler, simplifies the circuit and reduces the cost;

2. the circuit has various protection functions such as overvoltage, overcurrent, battery charge protection and the like, and can provide the reliability of emergency LED driving;

3. an emergency conversion judging circuit is constructed by using logic devices, and the circuit is simple and the cost is optimized;

4. The circuit integrates a conventional mode and an emergency lighting mode, saves space in lamp assembly, provides a greater freedom for lamp designers due to moderate space requirements of the integrated drive, and solves the problem of complex wiring;

5. The circuit uses the emergency Boost circuit 6, is driven by constant power, can realize the use of various LED loads, and is convenient for customers to use and reduce the driving model.

In summary, according to the constant current LED driving circuit for integrated emergency lighting provided by the invention, the primary side power supply conversion circuit is arranged to rectify and output the input ac voltage after filtering and rectifying the power factor, and the ac voltage is converted into the dc voltage through the secondary side rectifying and filtering circuit, and the dc voltage supplies power to two parts: the first part reduces the voltage through the Buck circuit to supply power for the battery charging circuit, and the battery charging circuit carries out constant-current and constant-voltage charging on the battery; the second part provides constant current driving for the LED through a conventional Boost circuit in a conventional mode, and the lithium battery provides constant power driving for the LED lamp through the emergency Boost circuit when the emergency state is entered; the emergency switching judging circuit detects the current state to realize the switching of the constant current LED driving and emergency lighting modes in the conventional mode.

The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent changes made by the specification and drawings of the present invention, or direct or indirect application in the relevant art, are included in the scope of the present invention.

Claims

1. The constant-current LED driving circuit integrating the emergency lighting is characterized by comprising a primary side power supply conversion circuit, a secondary side rectification circuit, a Buck circuit, a battery charging circuit, an emergency Boost circuit, an emergency switching judging circuit and a conventional Boost circuit;

The output end of the primary side power supply conversion circuit is electrically connected with the input end of the secondary side rectifying circuit, the output end of the secondary side rectifying circuit is electrically connected with the input end of the Buck circuit, the output end of the Buck circuit is electrically connected with the input end of the battery charging circuit, the output end of the battery charging circuit is electrically connected with the input end of the emergency switching judging circuit, and the output end of the emergency switching judging circuit is electrically connected with the input end of the conventional Boost circuit;

The emergency switching judging circuit comprises a resistor R36, a resistor R51, a resistor R99, a resistor R100, a resistor R101, a capacitor C21, a diode D9, a triode Q15 and a triode Q16;

One end of the resistor R100 is electrically connected with one end of the resistor R99, one end of the resistor R101 and one end of the capacitor C21 respectively, the other end of the capacitor C21 is electrically connected with the other end of the resistor R101 and the emitter of the triode Q16 respectively, the other end of the capacitor C21, the other end of the resistor R101 and the emitter of the triode Q16 are all grounded, the base of the triode Q16 is electrically connected with the other end of the resistor R100, the collector of the triode Q16 is electrically connected with one end of the resistor R36 and one end of the resistor R51 respectively, the other end of the resistor R51 is electrically connected with the base of the triode Q15, the emitter of the triode Q15 is electrically connected with the other end of the resistor R36, and the other end of the resistor R99 is electrically connected with the cathode of the diode D9;

the emergency Boost circuit comprises a chip U2, a resistor R28, a resistor R52, a resistor R53, a resistor R55, a resistor R56, a resistor R58, a resistor R63, a resistor R66, a resistor R67, a resistor R68, a resistor R71, a resistor R72, a resistor R75, a resistor R79, a resistor R80, a resistor R89, an electrolytic capacitor CE5, an electrolytic capacitor CE7, a diode D16, a diode D15, a diode D19, a diode D20, a voltage stabilizing diode DZ4, a triode Q7, a triode Q9, a triode Q10, a triode Q5, a triode Q11, a triode Q12 and a field effect transistor Q13;

2. The integrated emergency lighting constant current LED driver circuit of claim 1, wherein the primary side power conversion circuit comprises an EMC filter rectifier circuit and a PSR circuit, an output of the EMC filter rectifier circuit is electrically connected to an input of the PSR circuit, and an output of the PSR circuit is electrically connected to an input of the secondary side rectifier circuit.

3. The constant current LED driving circuit for integrated emergency lighting according to claim 2, wherein the EMC filter rectifying circuit comprises a rectifier bridge DB1, a capacitor C2, an X capacitor CX1, a Y capacitor CY2, a Y capacitor CY3, a varistor RV1, a magnetic induction coil L3, a transformer T1, a transformer T2, a safety resistor F1 and a strip CON1;

The power strip CON1 comprises a first pin, a second pin and a third pin, the first end of the rectifying bridge DB1 is electrically connected with one end of a primary winding of the transformer T2, the other end of the primary winding of the transformer T2 is electrically connected with one end of the Y capacitor CY2, one end of the X capacitor CX1 and one end of the primary winding of the transformer T1 respectively, the other end of the primary winding of the transformer T1 is electrically connected with one end of the piezoresistor RV1 and one end of the safety resistor F1 respectively, the other end of the safety resistor F1 is electrically connected with the second pin of the power strip CON1, the first pin of the power strip CON1 is electrically connected with one end of a secondary winding of the transformer T1 respectively, the other end of the secondary winding of the transformer T1 is electrically connected with the other end of the X capacitor CX1, one end of the secondary winding of the Y capacitor CX 3 and one end of the secondary winding of the transformer T2 respectively, the other end of the secondary winding of the transformer T2 is electrically connected with the second end of the piezoresistor RV1 and one end of the safety resistor F1 respectively, the other end of the rectifying bridge DB1 is electrically connected with the second end of the rectifying bridge CON1 and the other end of the C2, the other end of the rectifying bridge C2 is electrically connected with the third end of the inductor C1 and the inductor C2 respectively, and the other end of the end of C2C1 is electrically connected with the other end of the inductor C1 and the end of C2 is electrically connected with the end of C3 and C1 respectively.

4. The integrated emergency lighting constant current LED driver circuit of claim 3, wherein the PSR circuit comprises a chip U1, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a resistor R39, a resistor R42, a resistor R43, a capacitor C5, a capacitor C7, a capacitor C8, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C12, a Y capacitor CY1, an electrolytic capacitor CE1, a diode D2, a diode D4, a magnetic inductor TR1A, a magnetic inductor TR1B, and a field effect transistor Q2;

The chip U1 comprises a first pin, a second pin, a third pin, a fourth pin, a fifth pin and a sixth pin, the first pin of the chip U1 is electrically connected with one end of the resistor R8, one end of the resistor R9, one end of the resistor R10 and one end of the capacitor C8, the second pin of the chip U1 is respectively electrically connected with one end of the capacitor C5, the other end of the resistor R9, the other end of the resistor R10 and the other end of the capacitor C8, the second pin of the chip U1, one end of the capacitor C5, the other end of the resistor R9, the other end of the resistor R10 and the other end of the capacitor C8 are all grounded, and the third pin of the chip U1 is respectively connected with the other end of the capacitor C5, The cathode of the diode D2, one end of the electrolytic capacitor CE1 and one end of the resistor R12 are electrically connected, the other end of the resistor R12 is electrically connected with one end of the resistor R11, the other end of the resistor R11 is respectively electrically connected with one end of the resistor R1, one end of the resistor R42, one end of the capacitor C12, one end of the Y capacitor CY1 and one end of the magnetic induction coil TR1A through the magnetic induction coil L3, the other end of the Y capacitor CY1 is grounded, the other end of the resistor R1 is respectively electrically connected with the other end of the resistor R42, one end of the resistor R43 and one end of the resistor R39, the other end of the resistor R43 is respectively electrically connected with the other end of the resistor R39, the other end of the capacitor C12, one end of the resistor R5 and one end of the resistor R6 are electrically connected, the other end of the resistor R5 is electrically connected with the other end of the resistor R6 and the cathode of the diode D1, the anode of the diode D1 is electrically connected with the other end of the magnetic induction coil TR1A, the source of the field effect tube Q2 and one end of the capacitor C7, the drain of the field effect tube Q2 is electrically connected with the other end of the capacitor C7, one end of the resistor R19, one end of the resistor R20, one end of the resistor R18, one end of the resistor R17 and one end of the resistor R21, the other end of the resistor R20 is electrically connected with the other end of the resistor R19 and the other end of the resistor R18 respectively, and the other end of the resistor R20, The other end of the resistor R19 and the other end of the resistor R18 are grounded, the grid electrode of the field effect transistor Q2 is respectively and electrically connected with one end of the resistor R21, the anode of the diode D4 and one end of the resistor R16, the cathode of the diode D4 is respectively and electrically connected with the other end of the resistor R16 and one end of the resistor R15, the other end of the resistor R15 is electrically connected with the fourth pin of the chip U1, the fifth pin of the chip U1 is respectively and electrically connected with one end of the capacitor C11 and the other end of the resistor R17, the sixth pin of the chip U1 is respectively and electrically connected with one end of the resistor R14 and one end of the capacitor C9, The other end of the capacitor C9 is electrically connected with the other end of the capacitor C10 and the other end of the capacitor C11 respectively, the other end of the capacitor C9, the other end of the capacitor C10 and the other end of the capacitor C11 are all grounded, the other end of the resistor R8 is electrically connected with one end of the resistor R7 and one end of the magnetic induction coil RT1B respectively, the other end of the magnetic induction coil RT1B is electrically connected with the other end of the electrolytic capacitor CE1, the other end of the magnetic induction coil RT1B and the other end of the electrolytic capacitor CE1 are all grounded, and the other end of the resistor R7 is electrically connected with the anode of the diode D2.

5. The integrated emergency lighting constant current LED driver circuit of claim 1, wherein the secondary rectification circuit comprises a resistor R2, a resistor R3, a resistor R105, a resistor R106, a resistor R107, a resistor R110, a capacitor C14, a capacitor C35, an electrolytic capacitor CE2, an electrolytic capacitor CE3, an electrolytic capacitor CE9, an electrolytic capacitor CE10, a diode D17, a magnetically induced coil TR1C, and a magnetically induced coil TR1D;

6. The integrated emergency lighting constant current LED driver circuit of claim 1, wherein the Buck circuit comprises a chip U4, a resistor R13, a resistor R23, a resistor R24, a resistor R26, a resistor

R29, resistor R95, resistor R96, capacitor C2, capacitor C3, capacitor C13, capacitor C16, capacitor C36, electrolytic capacitor CE4, diode D13 and inductor L4;

The chip U4 comprises a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin and a seventh pin, wherein the first pin of the chip U4 is respectively and electrically connected with one end of the capacitor C13 and one end of the resistor R13, the other end of the resistor R13 is respectively and electrically connected with one end of the fifth pin of the chip U4, one end of the resistor R23, one end of the capacitor C36 and one end of the resistor R24, the other end of the capacitor C36 is respectively and electrically connected with the other end of the resistor R23, one end of the capacitor C2, one end of the third pin of the chip U4 and the other end of the capacitor C13, the other end of the resistor R23, one end of the capacitor C2, the third pin of the chip U4 and the other end of the capacitor C13 are respectively grounded, the other end of the capacitor C2 is electrically connected with the sixth pin of the chip U4, the second pin of the chip U4 is respectively electrically connected with one end of the resistor R96, one end of the diode D13 and one end of the inductor L4, one end of the capacitor L4 is respectively electrically connected with one end of the resistor L4, one end of the resistor C26 is electrically connected with one end of the resistor C4, one end of the capacitor C26 is electrically connected with one end of the resistor C29, one end of the capacitor C4 is electrically connected with one end of the other end of the resistor C4, one end of the resistor C4 is electrically connected with the capacitor C29, and the other end of the capacitor C29 is electrically connected with the other end of the capacitor C3, and the other end of the capacitor is electrically connected with the other end of the capacitor C3, and the capacitor C29 is electrically connected with the other end and the one end of the other end of the capacitor, and the capacitor is.

7. The integrated emergency lighting constant current LED driver circuit of claim 1, wherein the battery charging circuit comprises a chip U5, a resistor R34, a capacitor C17, a capacitor C18, a diode D11, a diode D12, and a dump resistor F2;

8. The integrated emergency lighting constant current LED driver circuit of claim 1, wherein the conventional Boost circuit comprises a chip U8, a resistor R33, a resistor R35, a resistor R37, a resistor R38, a resistor R44, a resistor R70, a resistor R85, a resistor R88, a resistor R91, a capacitor C4, a capacitor C6, a capacitor C15, a capacitor C20, an inductor L8, and a field effect transistor Q6;