Emergency power supply circuit and lighting equipment

Abstract

The utility model provides an emergency power supply circuit and a lighting device, the emergency power supply circuit comprises a charging circuit, an energy storage unit, a main control unit, an auxiliary power supply, a boost circuit, an auxiliary power supply control circuit and a boost control circuit, and the boost circuit comprises a boost unit, a feedback unit and a driving control unit. The output voltage of the charging circuit is monitored through the main control unit, when the charging circuit is abnormal, the auxiliary power supply is connected with the energy storage unit through the auxiliary power supply control circuit, so that the auxiliary power supply charges the energy storage unit, and the power supply stability of the energy storage unit is ensured; the boost circuit performs boost processing on the output voltage of the energy storage unit to ensure that the output voltage can meet the working voltage requirement of the load, and the boost circuit also adjusts the output voltage in real time through the feedback unit and the driving control unit, thereby providing stable boost voltage for the load and ensuring the reliability of load operation.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, and in particular to an emergency power supply circuit and lighting equipment. Background Art

[0002] Emergency power supplies can supply electricity in the event of a main power failure or blackout, ensuring continued operation of equipment or systems. For example, emergency lighting equipment can automatically illuminate lamps when a power grid failure occurs, and turn off the lamps after the battery pack is depleted. Emergency power supplies primarily rely on energy storage devices, such as batteries, to power the load. Energy storage devices are typically designed to output a standardized power supply voltage. Therefore, in some special scenarios, such as those with high lighting requirements, the emergency power supply may not be able to drive the lamps to illuminate. Furthermore, if the power grid failure lasts for an extended period, powering the lamps solely with the energy stored in the batteries may result in unstable output voltage due to insufficient power supply, preventing the lamps from maintaining normal illumination and causing flickering or low brightness. Utility Model Content

[0003] The utility model provides an emergency power supply circuit and lighting equipment, aiming to solve the problem of poor adaptability and stability of the output voltage of the emergency power supply in the related art.

[0004] In order to solve the above technical problems, the first aspect of the present invention provides an emergency power supply circuit, including: a charging circuit, an energy storage unit, a main control unit, an auxiliary power supply, a boost circuit, an auxiliary power supply control circuit and a boost control circuit, the boost circuit including a boost unit, a feedback unit and a drive control unit; the charging circuit is electrically connected to the energy storage unit and the main control unit respectively and is used to be electrically connected to an external power grid, the auxiliary power supply control circuit is electrically connected to the auxiliary power supply, the main control unit and the energy storage unit respectively, the boost control circuit is electrically connected to the boost unit, the energy storage unit and the main control unit respectively, the drive control unit is electrically connected to the boost unit and the feedback unit respectively, and the boost unit is also used to be electrically connected to an external load.

[0005] Furthermore, the boost unit includes an inductor and a first switching tube, one end of the inductor is electrically connected to the boost control circuit, the other end of the inductor is electrically connected to the first end of the first switching tube and is used to be electrically connected to an external load, the second end of the first switching tube is electrically connected to the drive control unit, and the third end of the first switching tube is electrically connected to the feedback unit.

[0006] Furthermore, the feedback unit includes a first voltage sampling circuit and a first current sampling circuit, the voltage sampling circuit is electrically connected to the other end of the inductor and the drive control unit respectively, and the current sampling circuit is electrically connected to the third end of the first switching tube and the drive control unit respectively.

[0007] Furthermore, the charging circuit includes a second rectifier and filter circuit, a transformer, a driver chip and a charging protection circuit. The second rectifier and filter circuit is electrically connected to the primary winding of the transformer and is used to be electrically connected to the external power grid. The driver chip is electrically connected to the primary winding and one end of the charging protection circuit respectively. The secondary winding of the transformer is electrically connected to the energy storage unit, and the other end of the charging protection circuit is electrically connected to the energy storage unit.

[0008] A second aspect of the present application provides a lighting device, comprising the emergency power supply circuit as described in the first aspect of the present application.

[0009] As can be seen from the above description, the present application charges the energy storage unit through the charging circuit, and the main control unit monitors the output voltage of the charging circuit. When an abnormality in the charging circuit is detected, the auxiliary power supply is connected to the energy storage unit through the auxiliary power supply control circuit, so that the auxiliary power supply charges the energy storage unit to ensure the stability of the power supply of the energy storage unit. At the same time, the energy storage unit is connected to the boost unit through the boost control circuit to boost the output voltage of the energy storage unit, so that the boost voltage drives the external load to ensure that the output voltage can meet the working voltage requirement of the load. The boost circuit also adjusts the output voltage in real time through the feedback unit and the drive control unit, thereby providing a stable boost voltage for the load and ensuring the reliability of the load operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic structural diagram of an emergency power supply circuit according to an embodiment of the present application;

[0011] Figure 2 is a circuit schematic diagram of a boost control circuit according to an embodiment of the present application;

[0012] Figure 3 is a circuit schematic diagram of an auxiliary power supply control circuit according to an embodiment of the present application;

[0013] Figure 4 This is a circuit schematic diagram of a main control unit according to an embodiment of the present application;

[0014] Figure 5 is a circuit schematic diagram of a boost circuit according to an embodiment of the present application;

[0015] Figure 6 is a circuit schematic diagram of a charging circuit according to an embodiment of the present application;

[0016] Figure 7 is a circuit schematic diagram of a relay circuit according to an embodiment of the present application;

[0017] Figure 8 This is a circuit schematic diagram of a power conversion circuit according to an embodiment of the present application. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0019] In the related art, there is a problem that the output voltage of the emergency power supply has poor adaptability and stability. Therefore, an embodiment of the present application provides an emergency power supply circuit.

[0020] like Figure 1 The figure shows a structural schematic diagram of an emergency power supply circuit provided in an embodiment of the present application, which includes: a charging circuit 100, an energy storage unit 200, a main control unit 300, an auxiliary power supply 400, a boost circuit 500, an auxiliary power supply control circuit 600 and a boost control circuit 700, the boost circuit 500 includes a boost unit 510, a feedback unit 520 and a drive control unit 530; the charging circuit 100 is electrically connected to the energy storage unit 200 and the main control unit 300 respectively and is used to be electrically connected to an external power grid, the auxiliary power supply control circuit 600 is electrically connected to the auxiliary power supply 400, the main control unit 300 and the energy storage unit 200 respectively, the boost control circuit 700 is electrically connected to the boost unit 510, the energy storage unit 200 and the main control unit 300 respectively, the drive control unit 530 is electrically connected to the boost unit 510 and the feedback unit 520 respectively, and the boost unit 510 is also used to be electrically connected to an external load 800.

[0021] Specifically, in this embodiment, the charging circuit 100 is connected to an external power grid to charge the energy storage unit 200, which may be a battery. The main control unit 300 is used to monitor the output voltage of the charging circuit 100 to determine whether the external power grid is normal. When an abnormality is detected in the charging circuit 100, the auxiliary power supply 400 is connected to the energy storage unit 200 via the auxiliary power supply control circuit 600, so that the auxiliary power supply 400 charges the energy storage unit 200, ensuring that the energy storage unit 200 stores sufficient power, which is conducive to improving the stability of power supply. At the same time, the energy storage unit 200 is connected to the boost unit 510 via the boost control circuit 700 to boost the output voltage of the energy storage unit 200, so that the boosted voltage drives the external load 800, ensuring that the output voltage can meet the operating voltage requirements of the load 800. The boost circuit 500 adjusts the output voltage in real time through the feedback unit 520 and the drive control unit 530, thereby providing a stable boosted voltage for the load 800 and ensuring the reliability of the operation of the load 800.

[0022] like Figure 2 、 Figure 3 and Figure 4 The following are schematic diagrams of a boost control circuit, an auxiliary power supply control circuit, and a main control unit provided in this embodiment, respectively. Figure 2 、 Figure 3 and Figure 4 The boost control circuit 700 and the auxiliary power supply control circuit 600 both include a third switch Q18 or Q8 and a fourth switch Q13 or Q6. A first terminal of the third switch Q18 or Q8 is electrically connected to the main control unit 300, a second terminal of the third switch Q18 or Q8 is electrically connected to a first terminal of the fourth switch Q13 or Q6, a third terminal of the third switch Q18 or Q8 is grounded, a second terminal of the fourth switch Q13 or Q6 is electrically connected to the energy storage unit 200, and a third terminal of the fourth switch Q13 or Q6 is electrically connected to the boost unit 510 or the auxiliary power supply 400. Furthermore, the fourth switch Q6 of the auxiliary power supply control circuit 600 is connected to an external button via a resistor R32 and a diode D7. When the external button is pressed, a low-level signal is transmitted to the gate of the fourth switch Q6, turning on the fourth switch Q6.

[0023] The third switch tube Q18 or Q8 can be a transistor such as Figure 2 、 Figure 3 The NPN transistor in the fourth switch tube Q13 or Q6 can be a MOS tube such as Figure 2 、 Figure 3The PMOS transistor, the third switch transistor Q18 or Q8, and the fourth switch transistor Q13 or Q6 are all connected to a bias voltage supply circuit. The bias voltage supply circuit of the third switch transistor Q18 or Q8 includes a resistor R39 or R77 and a resistor R40 or R85. The bias voltage supply circuit of the fourth switch transistor Q13 or Q6 includes a resistor R29 or R68 and a resistor R34 or R72.

[0024] Specifically, in this embodiment, the main control unit 300 can be a single-chip microcomputer. Pin 20 of the single-chip microcomputer detects the output voltage of the charging circuit 100 through a voltage sampling circuit (i.e., a voltage sampling circuit composed of resistors R47 and R49). When the external power grid loses power, a high-level signal is transmitted to the auxiliary power control circuit 600 and the boost control circuit 700 through pins 11 and 10. At this time, the third switch tube Q18 or Q8 will be turned on, thereby driving the fourth switch tube Q13 or Q6 to be turned on, and the auxiliary power supply 400 (i.e., Figure 2 VBAT++ in) and energy storage unit 200 (i.e. Figure 2 The auxiliary power supply 400 continuously charges the energy storage unit 200, and connects the energy storage unit 200 to the input of the boost unit 510 (the input voltage of the boost unit 510 is V0) to boost the output voltage of the energy storage unit 200 to obtain a boosted voltage, for example, 48V, and transmit the boosted voltage to the external load.

[0025] like Figure 5 The figure shows a circuit diagram of a boost circuit provided by this embodiment. Figure 5 The boost unit 510 includes an inductor L3 and a first switch tube Q10. One end of the inductor L3 is electrically connected to the boost control circuit 700, and the other end of the inductor L3 is electrically connected to the first end of the first switch tube Q10 and is used to be electrically connected to the external load 800. The second end of the first switch tube Q10 is electrically connected to the drive control unit 530, and the third end of the first switch tube Q10 is electrically connected to the feedback unit 520.

[0026] Further, see Figure 5 The boost circuit 500 also includes a first diode D8 and a first rectifier and filter circuit. The anode of the first diode D8 is electrically connected to one end of the inductor L3, the cathode of the first diode D8 is electrically connected to the first end of the first rectifier and filter circuit, the second end of the first rectifier and filter circuit is electrically connected to the other end of the inductor L3, and the third end of the first rectifier and filter circuit is used to be electrically connected to the external load 800.

[0027] The first rectifier and filter circuit includes a diode D10, a capacitor C19, a common-mode inductor T2, a capacitor C18, and a resistor RS2. The anode of the diode D10 is electrically connected to the inductor L3, the cathode of the diode D10 is electrically connected to the first end of the common-mode inductor T2 and the cathode of the first diode D8, one end of the capacitor C19 is electrically connected to the cathode of the diode D10, the other end of the capacitor C19 is grounded, the second end of the common-mode inductor T2 is electrically connected to one end of the resistor RS2, the third and fourth ends of the common-mode inductor T2 are both used to be electrically connected to an external load, the other end of the resistor RS2 is grounded, and the capacitor C18 is electrically connected to the third and fourth ends of the common-mode inductor T2. The first rectifier and filter circuit also includes a capacitor C12 and a resistor R41. The resistor R41 is electrically connected to the anode of the diode D10 and one end of the capacitor C12, respectively, and the other end of the capacitor C12 is electrically connected to the cathode of the diode D10.

[0028] Specifically, in this embodiment, after boosting, boost circuit 500 rectifies and filters the boosted voltage before transmitting it to an external load. Diode D10 is used to rectify the output voltage. Capacitor C12 and resistor R41 form an RC snubber circuit, which shunts and absorbs voltage peaks, reducing them and protecting the stability and reliability of diode D10. Capacitor C19, common-mode inductor T2, capacitor C18, and resistor RS2 are used for filtering. Furthermore, a first diode D8 is included, connected in parallel with inductor L3, to prevent inductor L3 from saturating when capacitor C19 is short-circuited.

[0029] Further, see Figure 5 The feedback unit 520 includes a first voltage sampling circuit and a first current sampling circuit. The voltage sampling circuit is electrically connected to the other end of the inductor L3 and the drive control unit 530 respectively. The current sampling circuit is electrically connected to the third end of the first switch tube Q10 and the drive control unit 530 respectively.

[0030] The first current sampling circuit includes a resistor RS1 and a resistor R58. One end of the resistor RS1 is electrically connected to the first switch tube Q10 and one end of the resistor, respectively. The other end of the resistor RS1 is grounded. The other end of the resistor R58 is electrically connected to the current detection end of the drive control unit 530. The first voltage sampling circuit includes a resistor R42, a resistor R44, a resistor R56 and a buffer circuit. One end of the resistor R42 is electrically connected to the inductor L3 and one end of the buffer circuit, respectively. The other end of the resistor R42 is electrically connected to one end of the resistor R44. The other end of the resistor R44 is electrically connected to one end of the resistor R56, the other end of the buffer circuit and the feedback voltage input end of the drive control unit 530, respectively. The other end of the resistor R56 is grounded. The buffer circuit includes a resistor R43 and a capacitor C15. The resistor R43 is electrically connected to one end of the resistor R42 and one end of the capacitor C15, respectively. The other end of the capacitor C15 is electrically connected to the other end of the resistor R44. The drive control unit 530 can use a controller with a model number of UC3843. The first switch tube Q10 can be a MOS tube such as Figure 5 In addition, the boost circuit 500 also includes a voltage sampling circuit, namely Figure 5 The circuit consists of resistors R46, R51 and R52. One end of the voltage sampling circuit is connected to the output of the boost unit 510, and the other end is connected to pin 3 of the microcontroller. The microcontroller can control the boost circuit 500 according to the voltage feedback signal.

[0031] Specifically, in this embodiment, the driver control unit 530 is configured to output a drive signal to the first switch Q10, causing the first switch Q10 to periodically switch in accordance with the drive signal. During each switching cycle, when the first switch Q10 is on, the inductor L3 stores energy, thereby increasing the output voltage. When the first switch Q10 is off, the inductor L3 releases the energy, transferring the stored energy to an external load, such as an LED unit. A first voltage sampling circuit is configured to collect the output voltage and transmit it to the driver control unit 530. The voltage is then compared with the reference voltage of an error amplifier within the driver control unit 530 to generate a control voltage, thereby adjusting the duty cycle or pulse width of the drive signal and thereby adjusting the on-time of the first switch Q10 to regulate the output voltage. A first current sampling circuit is configured to collect the output current and convert it into a voltage, which is then transmitted to the driver control unit 530. The driver control unit 530 adjusts the duty cycle or pulse width of the drive control signal based on the feedback voltage. Thus, by employing two sampling circuits for feedback, the boosted output voltage can be stabilized at a set voltage value, providing a stable and reliable power supply voltage for the external load 800.

[0032] In addition, to ensure power supply safety, a short-circuit protection circuit can be designed between the output of the boost circuit 500 and the load 800. The short-circuit protection circuit mainly consists of a comparison circuit, a current sampling circuit, a thyristor, and an NMOS transistor. The comparison circuit is electrically connected to the output of the boost circuit 500, one end of the current sampling circuit, and the first end of the thyristor, respectively. The other end of the current sampling circuit is electrically connected to the source of the NMOS transistor, the gate of the NMOS transistor is electrically connected to the second end of the thyristor, the drain of the NMOS transistor is electrically connected to the external load 800, and the third end of the thyristor is grounded. The current sampling circuit is used to collect current in the power supply circuit and transmit it to the comparison circuit. The comparison circuit determines whether a short circuit has occurred in the power supply circuit. When a short circuit occurs in the power supply circuit, it outputs a short-circuit protection signal to the thyristor. Upon receiving the short-circuit protection signal transmitted by the comparison circuit, the thyristor remains in the on state until it receives a shutdown signal, thereby completely shutting down the NMOS transistor, ensuring that the power supply circuit is completely disconnected from the load 800 and achieving short-circuit protection.

[0033] like Figure 6 The circuit diagram of a charging circuit provided by this embodiment is shown in FIG. Figure 6 The charging circuit 100 includes a second rectifier and filter circuit, a transformer T1, a driver chip U1, and a charging protection circuit. The second rectifier and filter circuit is electrically connected to the primary winding of the transformer T1 and is used to be electrically connected to the external power grid. The driver chip U1 is electrically connected to the primary winding and one end of the charging protection circuit respectively. The secondary winding of the transformer T1 is electrically connected to the energy storage unit 200, and the other end of the charging protection circuit is electrically connected to the energy storage unit 200. Among them, the second rectifier and filter circuit includes a common-mode inductor L1, a bridge rectifier circuit, a differential-mode inductor L2, and a resistor and capacitor unit. In addition, the secondary winding of the transformer T1 is connected to a diode D3 and a diode D1. The diode D3 can be used for rectification, and the diode D1 can be used to prevent backflow.

[0034] Further, see Figure 6 The charging protection circuit includes an optocoupler OP1, a second switch Q7, and a second current sampling circuit. The second current sampling circuit is electrically connected to the energy storage unit 200 and the first end of the second switch Q7, respectively. The second end of the second switch Q7 is electrically connected to the first end of the optocoupler OP1. The third end of the second switch Q7 is grounded. The second end of the optocoupler OP1 is electrically connected to the secondary winding. The third end of the optocoupler OP1 is electrically connected to the driver chip U1. The fourth end of the optocoupler OP1 is grounded. The second current sampling circuit is primarily composed of resistors R33 and R37.

[0035] Further, see Figure 6The charging circuit 100 also includes a voltage stabilizing circuit, which includes a voltage stabilizing diode U2, a second diode D4, a second voltage sampling circuit, and an optocoupler OP1. The voltage stabilizing circuit is electrically connected to the first terminal of the optocoupler OP1 and one terminal of the second voltage sampling circuit, respectively. The other terminal of the second voltage sampling circuit is electrically connected to the secondary winding. The cathode of the second diode D4 is electrically connected to the secondary winding, and the anode of the second diode D4 is electrically connected to the second terminal of the optocoupler OP1. The second voltage sampling circuit is primarily composed of resistors R27, R30, R35, and R36.

[0036] Specifically, in this embodiment, after the external power grid is input to the charging circuit 100, it is first rectified and filtered before being transmitted to the primary winding of the transformer T1, and then the secondary winding of the transformer T1 outputs a DC voltage to the energy storage unit 200 (i.e. Figure 6 CON1 in FIG, BAT+ represents the supply voltage of the energy storage unit 200); the second current sampling circuit is used to collect the current of the energy storage unit 200 and convert it into a voltage signal. When the current flowing through the energy storage unit 200 reaches a predetermined value, the second switch tube Q7 will be turned on, thereby lowering the voltage of the optocoupler OP1 and shutting down the driver chip U1, thereby preventing overcharging of the battery; the voltage stabilizing circuit divides the output voltage of the transformer T1 through the second voltage sampling circuit and transmits it to the voltage stabilizing tube U2. The voltage stabilizing tube U2 compares the collected voltage with the reference voltage and outputs a corresponding voltage control signal, which is transmitted to the optocoupler OP1. The optocoupler OP1 then feeds back to the driver chip U1, thereby regulating the output voltage of the transformer T1 to provide a stable charging voltage for the energy storage unit 200; the second diode D4 is used to limit the input voltage to protect the voltage stabilizing tube.

[0037] Furthermore, the emergency power supply circuit also includes a relay circuit, see Figure 7 The circuit schematic diagram of the relay circuit shown in the figure includes a relay K1 and a fifth switch tube Q3. The first end of the relay K1 is electrically connected to the first end of the fifth switch tube Q3. The second end of the relay K1 is electrically connected to the boost unit 510 and is used to be electrically connected to the external load 800. The second end of the fifth switch tube Q3 is electrically connected to the main control unit 300, and the third end of the fifth switch tube Q3 is grounded.

[0038] Specifically, in this embodiment, when the main control unit 300 detects a mains power failure, it outputs drive signals to the boost control circuit 700, the auxiliary power supply control circuit 600 and the relay circuit respectively. When the relay circuit receives a control signal transmitted by the main control unit 300, such as a high-level signal, the fifth switch tube Q3 is turned on and the relay K1 is energized, thereby driving an external load such as an LED unit.

[0039] In addition, the power supply of each circuit in this embodiment can be provided by the auxiliary power supply or the DC power obtained by rectification and conversion of the external power grid, for example Figure 8 In the power conversion circuit shown, the auxiliary power supply voltage VBAT++ and the DC power supply 34.5V are connected to the input of a first voltage-stabilizing converter circuit via diodes D13 and D14, respectively. The output of the first voltage-stabilizing converter circuit is connected to the input of a second voltage-stabilizing converter circuit. The first voltage-stabilizing converter circuit converts the auxiliary power supply voltage VBAT++ or the DC power supply 34.5V into a stable 12V voltage to power related circuits. The second voltage-stabilizing converter circuit converts the 12V voltage transmitted by the first voltage-stabilizing converter circuit into a stable 5V voltage to power the main control unit. The voltage-stabilizing converter circuit includes a Zener diode Q20 or Q19 and a transistor Q17 or Q16. The Zener diode Q20 or Q19 provides a reference voltage source and controls the output of the transistor Q17 or Q16 based on the feedback voltage, thereby regulating the output voltage.

[0040] The emergency power supply circuit provided in the embodiment of the present application charges the energy storage unit through the charging circuit, and the main control unit monitors the output voltage of the charging circuit. When an abnormality in the charging circuit is detected, the auxiliary power supply is connected to the energy storage unit through the auxiliary power supply control circuit, so that the auxiliary power supply charges the energy storage unit to ensure the stability of the power supply of the energy storage unit. At the same time, the energy storage unit is connected to the boost unit through the boost control circuit to boost the output voltage of the energy storage unit, so that the boost voltage drives the external load to ensure that the output voltage can meet the operating voltage requirement of the load. The boost circuit also adjusts the output voltage in real time through the feedback unit and the drive control unit, thereby providing a stable boost voltage for the load and ensuring the reliability of the load operation.

[0041] The embodiment of the present application further provides a lighting device, which includes the above-mentioned emergency power supply circuit. The lighting device may be an emergency light.

[0042] It should be noted that the various embodiments in the present invention are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other.

[0043] It should also be noted that, in the present invention, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further restrictions, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0044] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein, but is intended to be applied in the widest possible manner consistent with the principles and novel features disclosed herein.

Claims

1. An emergency power supply circuit, characterized in that: include: A charging circuit, an energy storage unit, a main control unit, an auxiliary power supply, a boost circuit, an auxiliary power supply control circuit, and a boost control circuit, wherein the boost circuit includes a boost unit, a feedback unit, and a drive control unit; The charging circuit is electrically connected to the energy storage unit and the main control unit respectively and is used to be electrically connected to an external power grid. The auxiliary power supply control circuit is electrically connected to the auxiliary power supply, the main control unit and the energy storage unit respectively. The boost control circuit is electrically connected to the boost unit, the energy storage unit and the main control unit respectively. The drive control unit is electrically connected to the boost unit and the feedback unit respectively. The boost unit is also used to be electrically connected to an external load.

2. The emergency power supply circuit according to claim 1, characterized in that: The boost unit includes an inductor and a first switching tube, one end of the inductor is electrically connected to the boost control circuit, the other end of the inductor is electrically connected to the first end of the first switching tube and is used to be electrically connected to an external load, the second end of the first switching tube is electrically connected to the drive control unit, and the third end of the first switching tube is electrically connected to the feedback unit.

3. The emergency power supply circuit according to claim 2, characterized in that: The boost circuit also includes a first diode and a first rectifier and filter circuit, the positive electrode of the first diode is electrically connected to one end of the inductor, the negative electrode of the first diode is electrically connected to the first end of the first rectifier and filter circuit, the second end of the first rectifier and filter circuit is electrically connected to the other end of the inductor, and the third end of the first rectifier and filter circuit is used to be electrically connected to an external load.

4. The emergency power supply circuit according to claim 2, characterized in that: The feedback unit includes a first voltage sampling circuit and a first current sampling circuit. The voltage sampling circuit is electrically connected to the other end of the inductor and the drive control unit respectively. The current sampling circuit is electrically connected to the third end of the first switching tube and the drive control unit respectively.

5. The emergency power supply circuit according to claim 1, characterized in that: The charging circuit includes a second rectifier and filter circuit, a transformer, a driver chip and a charging protection circuit. The second rectifier and filter circuit is electrically connected to the primary winding of the transformer and is used to be electrically connected to the external power grid. The driver chip is electrically connected to the primary winding and one end of the charging protection circuit respectively. The secondary winding of the transformer is electrically connected to the energy storage unit, and the other end of the charging protection circuit is electrically connected to the energy storage unit.

6. The emergency power supply circuit according to claim 5, characterized in that: The charging protection circuit includes an optocoupler, a second switching tube and a second current sampling circuit. The second current sampling circuit is electrically connected to the energy storage unit and the first end of the second switching tube, respectively. The second end of the second switching tube is electrically connected to the first end of the optocoupler. The third end of the second switching tube is grounded. The second end of the optocoupler is electrically connected to the secondary winding. The third end of the optocoupler is electrically connected to the driver chip. The fourth end of the optocoupler is grounded.

7. The emergency power supply circuit according to claim 6, characterized in that: The charging circuit also includes a voltage stabilizing circuit, which includes a voltage stabilizing diode, a second diode, a second voltage sampling circuit and the optocoupler. The voltage stabilizing circuit is electrically connected to the first end of the optocoupler and one end of the second voltage sampling circuit, respectively. The other end of the second voltage sampling circuit is electrically connected to the secondary winding, the cathode of the second diode is electrically connected to the secondary winding, and the anode of the second diode is electrically connected to the second end of the optocoupler.

8. The emergency power supply circuit according to claim 1, characterized in that: The boost control circuit and the auxiliary power supply control circuit both include a third switch tube and a fourth switch tube. The first end of the third switch tube is electrically connected to the main control unit, the second end of the third switch tube is electrically connected to the first end of the fourth switch tube, the third end of the third switch tube is grounded, the second end of the fourth switch tube is electrically connected to the energy storage unit, and the third end of the fourth switch tube is electrically connected to the boost unit or the auxiliary power supply.

9. The emergency power supply circuit according to claim 1, characterized in that: It also includes a relay circuit, which includes a relay and a fifth switch tube. The first end of the relay is electrically connected to the first end of the fifth switch tube, the second end of the relay is electrically connected to the boost unit and is used to be electrically connected to an external load, the second end of the fifth switch tube is electrically connected to the main control unit, and the third end of the fifth switch tube is grounded.

10. A lighting device, characterized in that: The emergency power supply circuit comprises the emergency power supply circuit according to any one of claims 1 to 9.

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