Emergency lamp control circuit for detecting battery temperature abnormity

Abstract

The utility model discloses an emergency lamp control circuit for detecting battery temperature abnormity, which relates to the field of emergency lamps and comprises a battery pack, a temperature control abnormity control circuit, a battery power supply circuit, an emergency lamp working circuit, a single chip microcomputer power supply circuit, a voltage detection circuit and a temperature control abnormity control circuit. The temperature control abnormity control circuit comprises a single chip microcomputer U4, resistors R22 to R23, resistors R25 to R26, a capacitor C6, capacitors C8 to C9, a virtual switch T.SW1 and a battery power supply circuit, the battery power supply circuit comprises a power supply circuit, a voltage transformation circuit and a power supply circuit which are sequentially connected in series, and the power supply circuit comprises an MOS tube Q3, a triode Q4, a diode D4, resistors R14 to R17, a resistor R40 and a capacitor C15. The integrated NTC detection circuit is used for collecting the surface temperature value of the battery; when the temperature value is abnormal, the triode Q4 is controlled to be cut off, and then the MOS tube Q3 is turned off. Warning and protection of the battery and the circuit in the case of abnormity are realized.

Description

Technical Field

[0001] The utility model relates to the field of emergency lights, in particular to an emergency light control circuit for detecting abnormal battery temperature. Background Technique

[0002] Emergency lighting refers to lighting facilities that are only used under abnormal conditions, including standby lighting, evacuation lighting, and safety lighting, and are widely used in hotels, shopping malls, hospitals, entertainment venues, and commercial office and civil buildings.

[0003] Due to environmental protection and the great advantages of lithium batteries in energy storage, more and more emergency lights use lithium iron phosphate batteries. Lithium batteries have strong activity, and there are certain limitations in relying solely on the protection board to protect the battery. The protection control circuit for detecting abnormal surface temperature of lithium iron phosphate batteries is even more important.

[0004] Therefore, providing an emergency light with a control circuit for detecting abnormal battery temperature can detect the surface temperature of the battery through an external NTC resistor under normal protection scenarios, strengthening the protection function of lithium battery emergency lights. Content of the Utility Model

[0005] To achieve the above object, the utility model adopts the following technical solutions: An emergency light control circuit for detecting abnormal battery temperature, comprising:

[0006] A battery pack, the battery pack includes n series-connected or parallel-connected battery cells B1, B2,..., Bn, the battery pack is provided with a positive electrode B+, a negative electrode and a detection pin NTC, the first battery cell B1 of the battery pack is provided with a positive electrode B1+, and the negative electrode of the battery pack is grounded;

[0007] All the battery cells are lithium iron phosphate batteries;

[0008] A temperature control abnormal control circuit, the temperature control abnormal control circuit includes a single-chip microcomputer U4, resistors R22 to R23, resistors R25 to R26, capacitors C6, C8 to C9, and a virtual switch T.SW1. The resistor R22, the resistor R23 and the ground are connected in series in turn. The virtual switch T.SW1, the resistor R23 and the capacitor C8 are connected in parallel. The 5th pin Keyin of the single-chip microcomputer U4 is connected between the resistor R22 and the resistor R23. Both ends of the capacitor C6 are respectively connected to the 1st pin VDD and the 14th pin GND of the single-chip microcomputer U4. The 14th pin GND of the single-chip microcomputer U4 is grounded. The positive electrode B+, the resistor R25, the resistor R26 and the ground are connected in series in turn. The capacitor C9 is connected in parallel with the resistor R26. The 12th pin CEN of the single-chip microcomputer U4 is connected between the resistor R25 and the resistor R26;

[0009] A battery power supply circuit includes a mains supply, a power supply circuit, a voltage conversion circuit, and a power supply circuit connected in series. The power supply circuit includes: a MOS tube Q3, a transistor Q4, a diode D4, resistors R14 to R17, a resistor R40, and a capacitor C15. The source of the MOS tube Q3 is connected to the voltage conversion circuit. The drain of the MOS tube Q3, the resistor R17, the diode D4, and the positive electrode B+ of the battery pack are connected in series in sequence. The two ends of the resistor R14 are respectively connected to the gate and source of the MOS tube Q3. The gate of the MOS transistor Q3 is connected to the collector of the transistor Q4, the emitter of the transistor Q4 is grounded, the 13th pin RA of the single-chip microcomputer U4, the resistor R15, and the base of the transistor Q4 are connected in series in sequence, the two ends of the resistor R16 are respectively connected to the emitter and base of the transistor Q4, the resistor R22, the resistor R40, the capacitor C15 and the ground are connected in series in sequence, and the detection pin NTC of the battery pack and the 11th pin RT1 of the single-chip microcomputer U4 are both connected between the resistor R40 and the capacitor C15;

[0010] Emergency light working circuit, the emergency light working circuit is connected to the positive electrode B+ of the battery pack, the positive electrode B1+ of the first battery cell of the battery pack and the single chip microcomputer U4;

[0011] A single-chip microcomputer power supply circuit, wherein the input terminal VIN of the single-chip microcomputer power supply circuit is connected to the positive electrode B+ of the battery pack and the positive electrode B1+ of the first battery cell of the battery pack, and the output terminal OUT of the single-chip microcomputer power supply circuit is connected to the first pin VDD of the single-chip microcomputer U4;

[0012] A voltage detection circuit, one end of which is connected to the battery power supply circuit, and the other end of which is connected to the 6th pin ACDET of the single-chip computer U4.

[0013] Preferably, the temperature control abnormality control circuit further includes a resistor R24 and several light emitting diodes, the two ends of which are connected in anti-parallel to the resistor R24 and the second pin VPP of the microcontroller U4 respectively, and the resistor R24 is connected to the third pin of the microcontroller U4.

[0014] Preferably, the power supply circuit further includes: resistors R18 to R19, a voltage stabilizing diode Z2, the drain of the MOS tube Q3, resistors R17, R18, R19 and the ground are connected in series in sequence, the voltage stabilizing diode Z2 is connected in parallel to the resistor R19, and the fourth pin ChargDet of the microcontroller U4 is connected between the resistor R18 and the resistor R19.

[0015] Preferably, the voltage conversion circuit includes: an AC-DC conversion chip U1, a transformer T1, diodes D1 to D3, resistors R2 to R13, capacitors C1 to C4, electrolytic capacitors E3 to E4, and a safety capacitor CY1. The mains power and the power supply circuit are sequentially connected in series to the first pin of the transformer T1. The seventh pin of the transformer T1, the diode D3, and the source electrode of the MOS transistor Q3 are sequentially connected in series. The two ends of the safety capacitor CY1 are respectively connected to the fifth pin and the sixth pin of the transformer T1. The fifth pin and the sixth pin of the transformer T1 are grounded. The electrolytic capacitor E4, the capacitor C4, and the resistor R13 are connected in parallel, and the two ends are respectively connected to the negative electrode of the diode D3 and the sixth pin of the transformer T1. The sixth pin of the transformer T1 is grounded. The GND pin of the AC-DC conversion chip U1 is grounded. The first pin of the transformer T1, the resistor R2, the resistor R4, the resistor R3, and the ground are sequentially connected in series. The capacitor C2 is connected in parallel to the resistor R3. The OV / BO pin of the AC-DC conversion chip U1 is connected between the resistor R4 and the resistor R3. The second pin of the transformer T1, the diode D1, and the resistor R7 are sequentially connected in series. The capacitor C1, the resistor R5, and the resistor R6 are connected in parallel, and the two ends are respectively connected to the resistor R7 and the first pin of the transformer T1. The GND pin of the AC-DC conversion chip U1 is connected to the second pin of the transformer T1. The fourth pin of the transformer T1, the resistor R8, the resistor R9, and the ground are sequentially connected in series. The resistor R11 and the resistor R12 are connected in parallel, and the two ends are respectively connected to the CS pin of the AC-DC conversion chip U1 and the ground. The two ends of the capacitor C3 are respectively connected to the FB pin of the AC-DC conversion chip U1 and the ground. The fourth pin of the transformer T1, the resistor R10, the diode D2, and the VDD pin of the AC-DC conversion chip U1 are sequentially connected in series. The two ends of the electrolytic capacitor E3 are respectively connected to the negative electrode of the diode D2 and the ground.

[0016] Preferably, the single-chip microcomputer power supply circuit includes: a three-terminal voltage regulator chip U2, a capacitor C5, electrolytic capacitors E5 to E6, a diode D5, and a diode D7. The two ends of the diode D5 are respectively connected to the negative electrode of the diode D3 and the VIN pin of the three-terminal voltage regulator chip U2. The two ends of the diode D7 are respectively connected to the positive electrode B1+ of the first cell of the battery pack and the VIN pin of the three-terminal voltage regulator chip U2. The electrolytic capacitor E5 and the capacitor C5 are connected in parallel, and the two ends are respectively connected to the VIN pin and the GND pin of the three-terminal voltage regulator chip U2. The two ends of the electrolytic capacitor E6 are respectively connected to the OUT pin and the GND pin of the three-terminal voltage regulator chip U2. The OUT pin of the three-terminal voltage regulator chip U2 is connected to the first pin VDD of the single-chip microcomputer U4.

[0017] Preferably, the emergency light working circuit includes: chip U3, diode D9, triode Q6, MOS transistor Q5, resistors R27 to R29, resistors R32 to R35, electrolytic capacitors E7 to E8, capacitors C10 to C12, inductor L2, and LED assembly. The two ends of the electrolytic capacitor E7 in parallel with the capacitor C10 are respectively connected to the Vin pin and the GND pin of the chip U3. The drain of the MOS transistor Q5 and the positive electrode B1+ of the first cell of the battery pack are both connected to the Vin pin of the chip U3. The source of the MOS transistor Q5 is connected to the positive electrode B+ of the battery pack. The gate of the MOS transistor Q5 is connected to the collector of the triode Q6. The emitter of the triode Q6 is grounded. The base of the triode Q6, the resistor R28, and the 7th pin Relay of the microcontroller U4 are connected in series in sequence. The two ends of the resistor R27 are respectively connected to the source and the gate of the MOS transistor Q5. The two ends of the resistor R29 are respectively connected to the base and the emitter of the triode Q6. The two ends of the resistor R32 in parallel with the resistor R33 are respectively connected to the CS pin and the GND pin of the chip U3. The two ends of the diode D9 are respectively connected to the SW pin and the GND pin of the chip U3. The LED assembly, the inductor L2, and the SW pin of the chip U3 are connected in series in sequence. The two ends of the electrolytic capacitor E8 in parallel with the capacitor C11 are respectively connected to one end of the inductor L2 connected to the LED assembly and the GND pin of the chip U3. The two ends of the resistor R34 in parallel with the capacitor C12 are respectively connected to one end of the inductor L2 connected to the LED assembly and the FB pin of the chip U3. The two ends of the resistor R35 are respectively connected to the FB pin of the chip U3 and the ground.

[0018] Preferably, the LED assembly includes n LED modules LED1, LED2,..., LEDn. Each LED module includes: an LED lamp, resistors R36 to R37, a zener diode Z3, and a capacitor C13. The positive electrode of the LED lamp is connected to the inductor L2. The two ends of the zener diode Z3 in parallel with the capacitor C13 are respectively connected to the resistor R36 and the ground. The resistor R36 is connected to the negative electrode of the LED lamp. The two ends of the resistor R37 are respectively connected to the negative electrode of the LED lamp and the ground. The LampDet pin of the microcontroller U4 is connected between the resistor R36 and the zener diode Z3.

[0019] Preferably, the voltage detection circuit includes: a zener diode Z1, a capacitor C7, a diode D8, and resistors R20 to R21. The zener diode Z1, the resistor R20, and the resistor R21 are connected in series in sequence and then in parallel with the capacitor C7. The positive electrode of the diode D3, the diode D8, the capacitor C7, and the ground are connected in series in sequence.

[0020] Preferably, the power supply circuit includes a rectifier bridge BR1, a varistor VDR, a capacitor X1, a fuse F1, an inductor L1, a resistor R1, and electrolytic capacitors E1 to E2. The mains power supply includes a live wire L and a neutral wire N. The live wire L is connected to the first pin of the rectifier bridge through the fuse, and the neutral wire N is connected to the second pin of the rectifier bridge. The two ends of the varistor VDR and the capacitor X1 are respectively connected to the first pin and the second pin of the rectifier bridge. The third pin of the rectifier bridge is connected to the first pin of a transformer T1 through the inductor L1. The resistor R1 is connected in parallel with the inductor L1. The two ends of the electrolytic capacitor E1 are respectively connected to the third pin and the fourth pin of the rectifier bridge. One end of the electrolytic capacitor E2 is connected to the end of the inductor L1 away from the rectifier bridge, and the other end of the electrolytic capacitor E2 is connected to the fourth pin of the rectifier bridge. The fourth pin of the rectifier bridge is grounded.

[0021] Preferably, the model of the single-chip microcomputer U4 is FT61EC22, and the model of the chip U3 is XL4001.

[0022] The working principle of the present utility model is as follows: The battery power supply circuit part provides a stable DC12V voltage. The power supply circuit is used to connect to the mains power supply, and the voltage conversion circuit is used to convert alternating current into direct current to charge the battery pack through the power supply circuit. The three-terminal voltage regulator chip of the single-chip microcomputer power supply circuit provides a stable 3.3V voltage to supply the single-chip microcomputer U4 of the temperature control abnormal control circuit.

[0023] When power is turned on, the battery power supply circuit is connected to the battery. The single-chip microcomputer U4 provides a high level to the base of the triode Q4 through the 13th pin, making the triode Q4 conduct, and then turning on the MOS tube Q3. After the MOS tube Q3 is turned on, the battery is charged through the diode D4 and the resistor R17.

[0024] The resistor R40 and the capacitor C15 are connected to the 11th pin of the single-chip microcomputer to form an NTC detection circuit. The 11th pin is connected to the yellow wire of the battery to connect to the NTC detection pin to collect abnormal battery temperature data. When an abnormality occurs, the 13th pin of the single-chip microcomputer outputs a low level to control the triode Q4 to cut off, and then turn off the MOS tube Q3 to achieve the shutdown of the charging control. At the same time, the single-chip microcomputer U4 controls the light-emitting diode to conduct through the 2nd and 3rd pins to achieve fast flashing alarm.

[0025] The beneficial effects of the present utility model are as follows: An integrated NTC detection circuit is used to collect the surface temperature value of the battery; when the temperature value is abnormal, the triode Q4 is controlled to cut off, and then the MOS tube Q3 is turned off. The warning and protection of the battery and the circuit are realized during abnormalities. Description of the Drawings

[0026] The drawings further illustrate the present utility model, but the embodiments in the drawings do not constitute any limitation to the present utility model.

[0027] Figure 1Schematic diagram of the battery power supply circuit provided by an embodiment of the present utility model;

[0028] Figure 2 Schematic diagram of the temperature control abnormal control circuit provided by an embodiment of the present utility model;

[0029] Figure 3 Schematic diagram of the emergency light working circuit provided by an embodiment of the present utility model;

[0030] Figure 4 Schematic diagram of the single-chip microcomputer power supply circuit provided by an embodiment of the present utility model;

[0031] Figure 5 Schematic diagram of the voltage detection circuit provided by an embodiment of the present utility model. Specific embodiments

[0032] The following will describe in detail the specific embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present utility model, and are not used to limit the present utility model.

[0033] It should be noted that in the present utility model, unless otherwise stated, when an element is referred to as being "connected to" another element, it means that a certain pin of the element is coupled to the other element.

[0034] As Figures 1 to 5 shown in

[0035] a battery pack, the battery pack includes n series-connected or parallel-connected battery cells B1, B2,..., Bn, the battery pack is provided with a positive electrode B+, a negative electrode and a detection pin NTC, the first battery cell B1 of the battery pack is provided with a positive electrode B1+, and the negative electrode of the battery pack is grounded;

[0036] All the battery cells are lithium iron phosphate batteries;

[0037] Thermostatic abnormal control circuit. The thermostatic abnormal control circuit includes a single-chip microcomputer U4, resistors R22 to R23, resistors R25 to R26, capacitors C6, C8 to C9, and a virtual switch T.SW1. The resistor R22, resistor R23 are serially connected to the ground in sequence. The virtual switch T.SW1, resistor R23 are in parallel with capacitor C8. The 5th pin Keyin of the single-chip microcomputer U4 is connected between resistor R22 and resistor R23. Both ends of capacitor C6 are respectively connected to the 1st pin VDD and the 14th pin GND of the single-chip microcomputer U4. The 14th pin GND of the single-chip microcomputer U4 is grounded. The positive pole B+, resistor R25, resistor R26 are serially connected to the ground in sequence. Capacitor C9 is in parallel with resistor R26. The 12th pin CEN of the single-chip microcomputer U4 is connected between resistor R25 and resistor R26;

[0038] Battery power supply circuit. The battery power supply circuit includes the mains power supply, a power supply circuit, a voltage transformation circuit and a power supply circuit connected in series in sequence. The power supply circuit includes: MOS transistor Q3, triode Q4, diode D4, resistors R14 to R17, resistor R40, capacitor C15. The source electrode of the MOS transistor Q3 is connected to the voltage transformation circuit. The drain electrode of the MOS transistor Q3, resistor R17, diode D4 and the positive pole B+ of the battery pack are serially connected in sequence. Both ends of resistor R14 are respectively connected to the gate and source electrode of the MOS transistor Q3. The gate of the MOS transistor Q3 is connected to the collector of the triode Q4. The emitter of the triode Q4 is grounded. The 13th pin RA of the single-chip microcomputer U4, resistor R15 and the base of the triode Q4 are serially connected in sequence. Both ends of resistor R16 are respectively connected to the emitter and base of the triode Q4. Resistor R22, resistor R40, capacitor C15 are serially connected to the ground in sequence. The detection pin NTC of the battery pack and the 11th pin RT1 of the single-chip microcomputer U4 are both connected between resistor R40 and capacitor C15;

[0039] Emergency light working circuit. The emergency light working circuit is connected to the positive pole B+ of the battery pack, the positive pole B1+ of the first battery cell of the battery pack and the single-chip microcomputer U4;

[0040] Single-chip microcomputer power supply circuit. The input terminal VIN of the single-chip microcomputer power supply circuit is connected to the positive pole B+ of the battery pack and the positive pole B1+ of the first battery cell of the battery pack. The output terminal OUT of the single-chip microcomputer power supply circuit is connected to the 1st pin VDD of the single-chip microcomputer U4;

[0041] Voltage detection circuit. One end of the voltage detection circuit is connected to the battery power supply circuit. The other end of the voltage detection circuit is connected to the 6th pin ACDET of the single-chip microcomputer U4.

[0042] The temperature control abnormal control circuit further includes a resistor R24 and several light-emitting diodes. After several of the light-emitting diodes are connected in anti-parallel, the two ends are respectively connected to the resistor R24 and the second pin VPP of the single-chip microcomputer U4, and the resistor R24 is connected to the third pin of the single-chip microcomputer U4.

[0043] The power supply circuit further includes: resistors R18 to R19, a voltage stabilizing diode Z2. The drain of the MOS transistor Q3, the resistor R17, the resistor R18, the resistor R19 and the ground are connected in series in sequence. The voltage stabilizing diode Z2 is connected in parallel with the resistor R19. The fourth pin ChargDet of the single-chip microcomputer U4 is connected between the resistor R18 and the resistor R19.

[0044] The voltage transformation circuit includes: an AC-DC conversion chip U1, a transformer T1, diodes D1 to D3, resistors R2 to R13, capacitors C1 to C4, electrolytic capacitors E3 to E4, and a safety capacitor CY1. The commercial power, the power supply circuit and the first pin of the transformer T1 are connected in series in sequence. The seventh pin of the transformer T1, the diode D3 and the source of the MOS transistor Q3 are connected in series in sequence. The two ends of the safety capacitor CY1 are respectively connected to the fifth pin and the sixth pin of the transformer T1. The fifth pin and the sixth pin of the transformer T1 are grounded. The electrolytic capacitor E4, the capacitor C4 and the resistor R13 are connected in parallel, and the two ends are respectively connected to the negative electrode of the diode D3 and the sixth pin of the transformer T1. The sixth pin of the transformer T1 is grounded. The GND pin of the AC-DC conversion chip U1 is grounded. The first pin of the transformer T1, the resistor R2, the resistor R4, the resistor R3 and the ground are connected in series in sequence. The capacitor C2 is connected in parallel with the resistor R3. The OV / BO pin of the AC-DC conversion chip U1 is connected between the resistor R4 and the resistor R3. The second pin of the transformer T1, the diode D1 and the resistor R7 are connected in series in sequence. The capacitor C1, the resistor R5 and the resistor R6 are connected in parallel, and the two ends are respectively connected to the resistor R7 and the first pin of the transformer T1. The GND pin of the AC-DC conversion chip U1 is connected to the second pin of the transformer T1. The fourth pin of the transformer T1, the resistor R8, the resistor R9 and the ground are connected in series in sequence. The resistor R11 and the resistor R12 are connected in parallel, and the two ends are respectively connected to the CS pin of the AC-DC conversion chip U1 and the ground. The two ends of the capacitor C3 are respectively connected to the FB pin of the AC-DC conversion chip U1 and the ground. The fourth pin of the transformer T1, the resistor R10, the diode D2 and the VDD pin of the AC-DC conversion chip U1 are connected in series in sequence. The two ends of the electrolytic capacitor E3 are respectively connected to the negative electrode of the diode D2 and the ground.

[0045] The single-chip microcomputer power supply circuit includes: a three-terminal voltage regulator chip U2, a capacitor C5, electrolytic capacitors E5 - E6, a diode D5, and a diode D7. The two ends of the diode D5 are respectively connected to the negative electrode of the diode D3 and the VIN pin of the three-terminal voltage regulator chip U2. The two ends of the diode D7 are respectively connected to the positive electrode B1+ of the first battery cell of the battery pack and the VIN pin of the three-terminal voltage regulator chip U2. The electrolytic capacitor E5 and the capacitor C5 are connected in parallel, and their two ends are respectively connected to the VIN pin and the GND pin of the three-terminal voltage regulator chip U2. The two ends of the electrolytic capacitor E6 are respectively connected to the OUT pin and the GND pin of the three-terminal voltage regulator chip U2. The OUT pin of the three-terminal voltage regulator chip U2 is connected to the first pin VDD of the single-chip microcomputer U4.

[0046] The emergency light working circuit includes: a chip U3, a diode D9, a triode Q6, a MOS tube Q5, resistors R27 - R29, resistors R32 - R35, electrolytic capacitors E7 - E8, capacitors C10 - C12, an inductor L2, and an LED assembly. The electrolytic capacitor E7 and the capacitor C10 are connected in parallel, and their two ends are respectively connected to the Vin pin and the GND pin of the chip U3. The drain of the MOS tube Q5 and the positive electrode B1+ of the first battery cell of the battery pack are both connected to the Vin pin of the chip U3. The source of the MOS tube Q5 is connected to the positive electrode B+ of the battery pack. The gate of the MOS tube Q5 is connected to the collector of the triode Q6. The emitter of the triode Q6 is grounded. The base of the triode Q6, the resistor R28, and the seventh pin Relay of the single-chip microcomputer U4 are connected in series in sequence. The two ends of the resistor R27 are respectively connected to the source and the gate of the MOS tube Q5. The two ends of the resistor R29 are respectively connected to the base and the emitter of the triode Q6. The resistors R32 and R33 are connected in parallel, and their two ends are respectively connected to the CS pin and the GND pin of the chip U3. The two ends of the diode D9 are respectively connected to the SW pin and the GND pin of the chip U3. The LED assembly, the inductor L2, and the SW pin of the chip U3 are connected in series in sequence. The electrolytic capacitor E8 and the capacitor C11 are connected in parallel, and their two ends are respectively connected to one end of the inductor L2 connected to the LED assembly and the GND pin of the chip U3. The resistor R34 and the capacitor C12 are connected in parallel, and their two ends are respectively connected to one end of the inductor L2 connected to the LED assembly and the FB pin of the chip U3. The two ends of the resistor R35 are respectively connected to the FB pin of the chip U3 and the ground.

[0047] The LED component includes n LED modules LED1, LED2, …, LEDn. Each LED module includes: an LED lamp, resistors R36 to R37, a zener diode Z3, and a capacitor C13. The positive electrode of the LED lamp is connected to an inductor L2. The two ends of the zener diode Z3 and the capacitor C13 in parallel are respectively connected to the resistor R36 and the ground. The resistor R36 is connected to the negative electrode of the LED lamp. The two ends of the resistor R37 are respectively connected to the negative electrode of the LED lamp and the ground. The LampDet pin of the single-chip microcomputer U4 is connected between the resistor R36 and the zener diode Z3. The resistance value of the resistor R36 is 10 KΩ, the resistance value of the resistor R37 is 5.1 Ω, and the breakdown voltage of the zener diode is 2 V.

[0048] The voltage detection circuit includes: a zener diode Z1, a capacitor C7, a diode D8, and resistors R20 to R21. The zener diode Z1, the resistor R20, and the resistor R21 are connected in series in sequence and then connected in parallel with the capacitor C7. The positive electrode of the diode D3, the diode D8, the capacitor C7, and the ground are connected in series in sequence.

[0049] The power supply circuit includes: a rectifier bridge BR1, a varistor VDR, a capacitor X1, a fuse F1, an inductor L1, a resistor R1, and electrolytic capacitors E1 to E2. The commercial power supply includes a live wire L and a neutral wire N. The live wire L is connected to the first pin of the rectifier bridge through the fuse. The neutral wire N is connected to the second pin of the rectifier bridge. The two ends of the varistor VDR and the capacitor X1 are respectively connected to the first pin and the second pin of the rectifier bridge. The third pin of the rectifier bridge is connected to the first pin of a transformer T1 through the inductor L1. The resistor R1 is connected in parallel with the inductor L1. The two ends of the electrolytic capacitor E1 are respectively connected to the third pin and the fourth pin of the rectifier bridge. One end of the electrolytic capacitor E2 is connected to the end of the inductor L1 far from the rectifier bridge, and the other end of the electrolytic capacitor E2 is connected to the fourth pin of the rectifier bridge. The fourth pin of the rectifier bridge is grounded.

[0050] The model of the single-chip microcomputer U4 is FT61EC22, and the model of the chip U3 is XL4001. The model of the rectifier bridge BR1 is MB6S, the model of the AC / DC conversion chip U1 is PN6370P, and the model of the three-terminal voltage regulator chip U2 is JC5333.

[0051] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these should all be considered as falling within the scope described in this specification.

Claims

1. An emergency light control circuit for detecting abnormal battery temperature, characterized in that: Comprising: A battery pack, the battery pack including n series-connected or parallel-connected battery cells B1, B2, …, Bn, the battery pack being provided with a positive electrode B+, a negative electrode and a detection pin NTC, the first battery cell B1 of the battery pack being provided with a positive electrode B1+, and the negative electrode of the battery pack being grounded; A temperature control abnormal control circuit, the temperature control abnormal control circuit including a single-chip microcomputer U4, resistors R22 to R23, resistors R25 to R26, capacitors C6, C8 to C9, and a virtual switch T.SW1. The resistor R22, the resistor R23 and the ground are connected in series in sequence. The virtual switch T.SW1, the resistor R23 and the capacitor C8 are connected in parallel. The 5th pin Keyin of the single-chip microcomputer U4 is connected between the resistor R22 and the resistor R23. The two ends of the capacitor C6 are respectively connected to the 1st pin VDD and the 14th pin GND of the single-chip microcomputer U4. The 14th pin GND of the single-chip microcomputer U4 is grounded. The positive electrode B+, the resistor R25, the resistor R26 and the ground are connected in series in sequence. The capacitor C9 is connected in parallel with the resistor R26. The 12th pin CEN of the single-chip microcomputer U4 is connected between the resistor R25 and the resistor R26; A battery power supply circuit, the battery power supply circuit including a mains power supply, a power supply circuit, a voltage transformation circuit and a power supply circuit connected in series in sequence. The power supply circuit includes: a MOS transistor Q3, a triode Q4, a diode D4, resistors R14 to R17, a resistor R40, and a capacitor C15. The source electrode of the MOS transistor Q3 is connected to the voltage transformation circuit. The drain electrode of the MOS transistor Q3, the resistor R17, the diode D4 and the positive electrode B+ of the battery pack are connected in series in sequence. The two ends of the resistor R14 are respectively connected to the gate electrode and the source electrode of the MOS transistor Q3. The gate electrode of the MOS transistor Q3 is connected to the collector electrode of the triode Q4. The emitter electrode of the triode Q4 is grounded. The 13th pin RA of the single-chip microcomputer U4, the resistor R15 and the base electrode of the triode Q4 are connected in series in sequence. The two ends of the resistor R16 are respectively connected to the emitter electrode and the base electrode of the triode Q4. The resistor R22, the resistor R40, the capacitor C15 and the ground are connected in series in sequence. The detection pin NTC of the battery pack and the 11th pin RT1 of the single-chip microcomputer U4 are both connected between the resistor R40 and the capacitor C15; An emergency lamp working circuit, the emergency lamp working circuit being connected to the positive electrode B+ of the battery pack, the positive electrode B1+ of the first battery cell of the battery pack and the single-chip microcomputer U4; A single-chip microcomputer power supply circuit, the input end VIN of the single-chip microcomputer power supply circuit being connected to the positive electrode B+ of the battery pack and the positive electrode B1+ of the first battery cell of the battery pack, and the output end OUT of the single-chip microcomputer power supply circuit being connected to the 1st pin VDD of the single-chip microcomputer U4; A voltage detection circuit, one end of the voltage detection circuit being connected to the battery power supply circuit, and the other end of the voltage detection circuit being connected to the 6th pin ACDET of the single-chip microcomputer U4.

2. The emergency lamp control circuit for detecting abnormal battery temperature according to claim 1, wherein: The temperature control abnormal control circuit further includes a resistor R24 and a plurality of light-emitting diodes. After being anti-parallel-connected, the two ends of the plurality of light-emitting diodes are respectively connected to the resistor R24 and the 2nd pin VPP of the single-chip microcomputer U4, and the resistor R24 is connected to the 3rd pin of the single-chip microcomputer U4.

3. The emergency light control circuit for detecting abnormal battery temperature according to claim 1, characterized in that: The power supply circuit further includes: resistors R18 to R19, and a zener diode Z2. The drain of the MOS transistor Q3, resistor R17, resistor R18, resistor R19 are sequentially connected in series to the ground. The zener diode Z2 is connected in parallel with resistor R19. The 4th pin ChargDet of the single-chip microcomputer U4 is connected between resistor R18 and resistor R19.

4. The emergency lamp control circuit for detecting abnormal battery temperature according to claim 1, characterized in that: The voltage transformation circuit includes: an AC-DC conversion chip U1, a transformer T1, diodes D1 to D3, resistors R2 to R13, capacitors C1 to C4, electrolytic capacitors E3 to E4, and a safety capacitor CY1. The commercial power supply, the power supply circuit and the 1st pin of the transformer T1 are sequentially connected in series. The 7th pin of the transformer T1, diode D3 and the source of the MOS transistor Q3 are sequentially connected in series. The two ends of the safety capacitor CY1 are respectively connected to the 5th pin and the 6th pin of the transformer T1. The 5th pin and the 6th pin of the transformer T1 are grounded. The electrolytic capacitor E4, capacitor C4 and resistor R13 are connected in parallel, and the two ends are respectively connected to the negative electrode of diode D3 and the 6th pin of the transformer T1. The 6th pin of the transformer T1 is grounded. The GND pin of the AC-DC conversion chip U1 is grounded. The 1st pin of the transformer T1, resistor R2, resistor R4, resistor R3 are sequentially connected in series to the ground. The capacitor C2 is connected in parallel with resistor R3. The OV / BO pin of the AC-DC conversion chip U1 is connected between resistor R4 and resistor R3. The 2nd pin of the transformer T1, diode D1 and resistor R7 are sequentially connected in series. The capacitor C1, resistor R5 and resistor R6 are connected in parallel, and the two ends are respectively connected to resistor R7 and the 1st pin of the transformer T1. The GND pin of the AC-DC conversion chip U1 is connected to the 2nd pin of the transformer T1. The 4th pin of the transformer T1, resistor R8, resistor R9 are sequentially connected in series to the ground. Resistors R11 and R12 are connected in parallel, and the two ends are respectively connected to the CS pin of the AC-DC conversion chip U1 and the ground. The two ends of the capacitor C3 are respectively connected to the FB pin of the AC-DC conversion chip U1 and the ground. The 4th pin of the transformer T1, resistor R10, diode D2 and the VDD pin of the AC-DC conversion chip U1 are sequentially connected in series. The two ends of the electrolytic capacitor E3 are respectively connected to the negative electrode of diode D2 and the ground.

5. The emergency light control circuit for detecting abnormal battery temperature according to claim 4, characterized in that: The single-chip microcomputer power supply circuit includes: a three-terminal voltage regulator chip U2, capacitor C5, electrolytic capacitors E5 to E6, diode D5, diode D7. The two ends of diode D5 are respectively connected to the negative electrode of diode D3 and the VIN pin of the three-terminal voltage regulator chip U2. The two ends of diode D7 are respectively connected to the positive electrode B1+ of the first cell of the battery pack and the VIN pin of the three-terminal voltage regulator chip U2. The electrolytic capacitor E5 and capacitor C5 are connected in parallel, and the two ends are respectively connected to the VIN pin and the GND pin of the three-terminal voltage regulator chip U2. The two ends of the electrolytic capacitor E6 are respectively connected to the OUT pin and the GND pin of the three-terminal voltage regulator chip U2. The OUT pin of the three-terminal voltage regulator chip U2 is connected to the 1st pin VDD of the single-chip microcomputer U4.

6. The emergency light control circuit for detecting abnormal battery temperature according to claim 1, characterized in that: The emergency light working circuit includes: chip U3, diode D9, triode Q6, MOS transistor Q5, resistors R27 to R29, resistors R32 to R35, electrolytic capacitors E7 to E8, capacitors C10 to C12, inductor L2, and LED assembly. The two ends of the electrolytic capacitor E7 in parallel with the capacitor C10 are respectively connected to the Vin pin and the GND pin of the chip U3. The drain of the MOS transistor Q5 and the positive electrode B1+ of the first cell of the battery pack are both connected to the Vin pin of the chip U3. The source of the MOS transistor Q5 is connected to the positive electrode B+ of the battery pack. The gate of the MOS transistor Q5 is connected to the collector of the triode Q6. The emitter of the triode Q6 is grounded. The base of the triode Q6, the resistor R28, and the 7th pin Relay of the single-chip microcomputer U4 are connected in series in sequence. The two ends of the resistor R27 are respectively connected to the source and the gate of the MOS transistor Q5. The two ends of the resistor R29 are respectively connected to the base and the emitter of the triode Q6. The two ends of the resistor R32 in parallel with the resistor R33 are respectively connected to the CS pin and the GND pin of the chip U3. The two ends of the diode D9 are respectively connected to the SW pin and the GND pin of the chip U3. The LED assembly, the inductor L2, and the SW pin of the chip U3 are connected in series in sequence. The two ends of the electrolytic capacitor E8 in parallel with the capacitor C11 are respectively connected to one end of the inductor L2 connected to the LED assembly and the GND pin of the chip U3. The two ends of the resistor R34 in parallel with the capacitor C12 are respectively connected to one end of the inductor L2 connected to the LED assembly and the FB pin of the chip U3. The two ends of the resistor R35 are respectively connected to the FB pin of the chip U3 and the ground.

7. The emergency lamp control circuit for detecting abnormal battery temperature according to claim 6, wherein: The LED assembly includes n LED modules LED1, LED2,..., LEDn. Each LED module includes: an LED lamp, resistors R36 to R37, a zener diode Z3, and a capacitor C13. The positive electrode of the LED lamp is connected to the inductor L2. The two ends of the zener diode Z3 in parallel with the capacitor C13 are respectively connected to the resistor R36 and the ground. The resistor R36 is connected to the negative electrode of the LED lamp. The two ends of the resistor R37 are respectively connected to the negative electrode of the LED lamp and the ground. The LampDet pin of the single-chip microcomputer U4 is connected between the resistor R36 and the zener diode Z3.

8. The emergency light control circuit for detecting abnormal battery temperature according to claim 4, characterized in that: The voltage detection circuit includes: a zener diode Z1, a capacitor C7, a diode D8, and resistors R20 to R21. The zener diode Z1, the resistor R20, and the resistor R21 are connected in series in sequence and then connected in parallel with the capacitor C7. The positive electrode of the diode D3, the diode D8, the capacitor C7, and the ground are connected in series in sequence.

9. The emergency light control circuit for detecting abnormal battery temperature according to claim 4, wherein: The power supply circuit includes: a rectifier bridge BR1, a varistor VDR, a capacitor X1, a fuse F1, an inductor L1, a resistor R1, electrolytic capacitors E1 to E2. The mains power supply includes a live wire L and a neutral wire N. The live wire L is connected to the first pin of the rectifier bridge through the fuse. The neutral wire N is connected to the second pin of the rectifier bridge. The two ends of the varistor VDR and the capacitor X1 are respectively connected to the first pin and the second pin of the rectifier bridge. The third pin of the rectifier bridge is connected to the first pin of a transformer T1 through the inductor L1. The resistor R1 is connected in parallel with the inductor L1. The two ends of the electrolytic capacitor E1 are respectively connected to the third pin and the fourth pin of the rectifier bridge. One end of the electrolytic capacitor E2 is connected to the end of the inductor L1 far from the rectifier bridge, and the other end of the electrolytic capacitor E2 is connected to the fourth pin of the rectifier bridge. The fourth pin of the rectifier bridge is grounded.

10. The emergency light control circuit for detecting abnormal battery temperature according to claim 6, characterized in that: The model of the single-chip microcomputer U4 is FT61EC22, and the model of the chip U3 is XL4001.

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