An emergency power supply control system

Abstract

The present invention discloses an emergency power supply control system including: a main control module, a power storage module, a charging module, and a discharging module, wherein the main control module is connected to the power storage module, the charging module, and the discharging module respectively, and the charging module, the power storage module, and the discharging module are connected in sequence; the power storage module includes a power storage control unit and a power storage management unit, wherein the input end of the power storage management unit is connected to the output end of the charging module, the output end of the power storage management unit is connected to the input end of the discharging module, the input end of the power storage management unit is also connected to the output end of the power storage control unit, and the input end of the power storage control unit is connected to the main control module. The present invention can reduce the standby power consumption of the emergency power supply when it is not in use, thereby increasing the standby time of the emergency power supply, and is more conducive to the long-term storage of the emergency power supply.

Description

Technical Field

[0001] The invention relates to the technical field of emergency power supply, and in particular to an emergency power supply control system. Background Art

[0002] Emergency power supply refers to an independent power supply device that can immediately provide emergency power supply to important loads for a short time when the normal power supply is interrupted. It is becoming more and more commonly used in construction, electricity, fire protection and other fields.

[0003] With the development of society and the continuous improvement of construction technology, urban buildings tend to be large-scale and high-rise, and the requirements for power supply for buildings are getting higher and higher. The informatization of society and the modernization of buildings have made buildings more and more dependent on power supply, especially for some important public buildings. Once the power supply is interrupted, it will cause major political impact or economic losses. If a fire occurs, the consequences will be even more disastrous.

[0004] At present, emergency power supplies may generally be in an idle state for a long time. In today's energy-saving and environmental protection era, higher requirements are placed on the standby power consumption and standby time of emergency power supplies, so that emergency power supplies can be stored for a long time and play their due role in emergency use. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an emergency power supply control system, which can reduce the standby power consumption of the emergency power supply when it is not in use, thereby increasing the standby time of the emergency power supply and being more conducive to the long-term storage of the emergency power supply.

[0006] In the first aspect, an embodiment of the present invention provides an emergency power supply control system: comprising: a main control module, a power storage module, a charging module, and a discharging module, wherein the main control module is connected to the power storage module, the charging module, and the discharging module, respectively, and the charging module, the power storage module, and the discharging module are connected in sequence; the power storage module comprises a power storage control unit and a power storage management unit, the input end of the power storage management unit is connected to the output end of the charging module, the output end of the power storage management unit is connected to the input end of the discharging module, the input end of the power storage management unit is also connected to the output end of the power storage control unit, and the input end of the power storage control unit is connected to the main control module.

[0007] An emergency power supply control system according to an embodiment of the present invention has at least the following beneficial effects: it can reduce the standby power consumption of the emergency power supply when it is not in use, thereby increasing the standby time of the emergency power supply and being more conducive to long-term storage of the emergency power supply.

[0008] In an emergency power supply control system according to some other embodiments of the present invention, the power storage control unit includes a switching circuit, a main control circuit, and a self-locking power supply circuit, the switching circuit, the main control circuit and the self-locking power supply circuit are connected in sequence, and the switching circuit connection and the self-locking power supply circuit are both connected to the power storage management unit.

[0009] This embodiment can realize partial control of the power storage control unit over the power storage management unit, and can realize self-locking of the power storage control unit's own power supply circuit, thereby saving energy consumption. At the same time, when there is no need for power storage output, the beneficial effects of low standby power consumption and long storage time can be achieved by turning off the self-locking power supply circuit of the power storage control unit.

[0010] In an emergency power supply control system according to some other embodiments of the present invention, the main control circuit includes: a first main control chip, a third main control chip, and a second power supply chip, the output end of the first main control chip is connected to the input end of the power storage management unit, the output end of the power storage management unit is connected to the input end of the second power supply chip, and the output end of the second power supply chip is connected to the third main control chip.

[0011] This embodiment can realize effective communication control among the power storage control unit, the power storage management unit and the main control module.

[0012] According to some other embodiments of the present invention, an emergency power supply control system, the self-locking power supply circuit includes: a first diode, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first transistor, a first switch tube, and a first power supply chip, the first end of the first diode is connected to the first main control chip, the second end of the first diode is connected to the first end of the third resistor, the second end of the third resistor is respectively connected to the base of the first transistor and the first end of the fourth resistor, the second end of the fourth resistor is connected to the emitter of the first transistor, the collector of the first transistor is connected to the first end of the sixth resistor, the second end of the sixth resistor is respectively connected to the first end of the fifth resistor and the third end of the first switch tube, the second end of the fifth resistor is connected to the second end of the first switch tube, the first end of the first switch tube is connected to the second pin of the first power supply chip, the first pin of the first power supply chip is connected to the emitter of the first transistor, and the third pin of the first power supply chip is connected to the first main control chip.

[0013] This embodiment is a specific design of a self-locking power supply circuit, which can control the self-locking power supply circuit to be turned on when the first main control chip pin outputs a high level, thereby realizing the self-locking power supply function and achieving the beneficial effect of low power consumption of the emergency power supply.

[0014] According to some other embodiments of the present invention, an emergency power supply control system, the switching circuit includes: a first switch, a second switch, a thirty-seventh resistor, a thirty-eighth resistor, a thirty-ninth resistor, a second voltage-stabilizing diode, a fifth diode, and a sixth diode, the first end of the sixth diode is connected to the third main control chip, the second end of the sixth diode is connected to the second end of the fifth diode, the first end of the fifth diode is respectively connected to the first end of the thirty-eighth resistor and the first end of the first switch, the second end of the thirty-eighth resistor is respectively connected to the first end of the thirty-ninth resistor and the first end of the second switch, the second end of the thirty-nineth resistor is respectively connected to the first end of the second voltage-stabilizing diode and the ground, the second end of the second voltage-stabilizing diode, the second end of the first switch, and the second end of the second switch are all connected to the first end of the thirty-seventh resistor, and the second end of the thirty-seventh resistor is connected to the positive electrode of the power storage management unit.

[0015] This embodiment can achieve that when the first switch or the second switch is closed, the third main control chip is triggered to power on, thereby triggering the above-mentioned self-locking power supply circuit through the sixth diode, and at the same time, the first main control chip can be powered on, thereby turning on the self-locking power supply circuit through the above-mentioned first diode, ultimately achieving the beneficial effect of saving energy consumption.

[0016] According to some other embodiments of the present invention, in an emergency power supply control system, the discharge module includes an AC discharge module and a DC discharge module, the AC discharge module includes a DC-AC conversion unit, an AC sampling unit, and an AC output unit, the DC-AC conversion unit is connected to the power storage management unit, the DC-AC conversion unit, the AC sampling unit, and the AC output unit are connected in sequence, the DC-AC conversion unit and the AC sampling unit are both connected to the main control module, the DC discharge module includes a DC output protection unit and a DC output unit, the DC output protection unit is respectively connected to the main control module and the power storage module, and the DC output protection unit is also connected to the DC output unit.

[0017] According to an emergency power supply control system of some other embodiments of the present invention, the charging module includes a DC input unit, a DC input protection unit, and a DC-DC conversion unit connected in sequence, and the output end of the DC-DC conversion unit is respectively connected to the power storage module and the main control module.

[0018] This embodiment can implement DC input protection at the DC input end, thereby reducing damage to the rear-end circuit of the DC input end.

[0019] According to some other embodiments of the present invention, an emergency power supply control system, the AC sampling unit includes: a second main control chip, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, and a second capacitor, the first end of the twentieth resistor is connected to the first end of the DC-AC conversion unit, the first end of the twentieth resistor is also connected to the first end of the twenty-first resistor, the second end of the twentieth resistor is connected to the first end of the twenty-second resistor, the second end of the twenty-first resistor and the second end of the twenty-second resistor are both connected to the second main control chip, the first end of the twenty-third resistor is connected to the second end of the DC-AC conversion unit, the second end of the twenty-third resistor is respectively connected to the second main control chip, the first end of the second capacitor, and the first end of the twenty-fourth resistor, the second end of the second capacitor and the second end of the twenty-fourth resistor are both connected to the first end of the DC-AC conversion unit.

[0020] This embodiment can detect the voltage or current at the AC output end, so that the voltage or current signal is fed back to the third main control chip through the second main control chip, so that the third main control chip can control the DC-AC conversion unit.

[0021] According to an emergency power supply control system of some other embodiments of the present invention, the DC output protection unit includes: a second power supply chip, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, a twenty-ninth resistor, a thirtieth resistor, a thirty-first resistor, a thirty-second resistor, a thirty-third resistor, a thirty-fourth resistor, a thirty-fifth resistor, a thirty-sixth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a fourth switch tube, a fifth switch tube, a third transistor, and a fourth transistor, the first end of the third capacitor, the first end of the twenty-fifth resistor, and the first end of the twenty-sixth resistor are all connected to the third main control chip, the second end of the third capacitor and the second end of the twenty-sixth resistor are both connected to the first end of the second power supply chip, the second end of the twenty-fifth resistor is connected to the second end of the second power supply chip, the first end of the fourth capacitor, the first end of the twenty-seventh resistor, and the first end of the twenty-eighth resistor are all connected to the third main control chip, the second end of the fourth capacitor and the second end of the twenty-eighth resistor are both connected to the first end of the second power supply chip, and the second end of the second The second end of the seventeenth resistor is connected to the second end of the fifth switch tube, the third end of the fifth switch tube is connected to the first end of the thirty-first resistor, the second end of the thirty-first resistor is connected to the collector of the fourth transistor, the emitter of the fourth transistor is connected to the first end of the thirty-sixth resistor, the second end of the thirty-sixth resistor is connected to the base of the fourth transistor, the base of the fourth transistor is connected to the first end of the thirty-fifth resistor, the second end of the thirty-fifth resistor is connected to the third main control chip, the first end of the fifth switch tube is connected to the first end of the fourth switch tube, the second end of the fourth switch tube is connected to the second end of the second power supply chip, the third end of the fourth switch tube is connected to the first end of the thirty-second resistor, the second end of the thirty-second resistor is connected to the collector of the third transistor, the emitter of the third transistor and the first end of the thirty-third resistor are respectively connected to the first end of the second power supply chip, the second end of the thirty-third resistor is connected to the base of the third transistor, the base of the third transistor is connected to the first end of the thirty-fourth resistor, and the second end of the thirty-fourth resistor is connected to the third main control chip.

[0022] This embodiment can effectively prevent the user from connecting an external voltage to cause voltage backflow or overvoltage breakdown damage at the DC output terminal, thereby solving the overvoltage protection problem at the DC output terminal.

[0023] According to an emergency power supply control system of some other embodiments of the present invention, the DC input protection unit includes a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a second triode, a second diode, a third diode, a fourth diode, a voltage regulator, a photocoupler, a first voltage regulator diode, a second switch tube, a third switch tube, and a first capacitor. The first end of the ninth resistor is connected to the first end of the DC input unit, the second end of the ninth resistor is connected to the first end of the tenth resistor, and the first end of the tenth resistor is connected to the first end of the DC input unit. The first end of the voltage regulator is also connected to the first end of the voltage regulator, the second end of the tenth resistor and the second end of the voltage regulator are respectively connected to the second end of the DC input unit, the first end of the tenth resistor is also connected to the first end of the eleventh resistor, the second end of the eleventh resistor is connected to the collector of the second transistor, the third end of the voltage regulator is connected to the first end of the twelfth resistor, the second end of the twelfth resistor is connected to the base of the second transistor, the base of the second transistor is also connected to the first end of the thirteenth resistor, the second end of the thirteenth resistor is connected to the emitter of the second transistor, the second end of the thirteenth resistor is also connected to the second end of the second diode, and the second diode first end is connected to the emitter of the second transistor. The first end of the first transistor is connected to the first end of the ninth resistor, the collector of the second transistor is also connected to the first end of the third diode, the second end of the third diode is connected to the first end of the fourteenth resistor, the second end of the fourteenth resistor is connected to the second end of the DC input unit, the second end of the third diode is also connected to the second pin of the photoelectric coupler, the first pin of the photoelectric coupler is connected to the second end of the fourth diode, the first end of the fourth diode is connected to the first end of the sixteenth resistor, the second end of the sixteenth resistor is connected to the fourth pin of the photoelectric coupler, and the third pin of the photoelectric coupler is respectively connected to the first end of the seventeenth resistor and the first end of the eighteenth resistor One end is connected to the second end of the first voltage zener diode, the second end of the eighteenth resistor is connected to the first end of the nineteenth resistor, the second end of the nineteenth resistor is connected to the second end of the first capacitor, the first end of the nineteenth resistor is also connected to the third end of the third switch tube, the second end of the third switch tube is connected to the second end of the first capacitor, the first end of the third switch tube is connected to the first end of the second switch tube, the second end of the second switch tube is connected to the first end of the fifteenth resistor, the second end of the fifteenth resistor is connected to the second end of the seventeenth resistor and the third end of the second switch tube, and the second end of the third switch tube is also connected to the DC-DC conversion unit.

[0024] This embodiment can effectively prevent the circuit connected to the back of the DC input terminal from being burned out or damaged due to voltage input with opposite polarity. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a module block diagram of a specific embodiment of the emergency power supply control system in an embodiment of the present invention;

[0026] Figure 2 It is a circuit schematic diagram of a specific embodiment of the emergency power supply control system in the embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following will be combined with the embodiments to clearly and completely describe the concept of the present invention and the technical effects produced, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0028] In the description of the present invention, if it involves a description of orientation, for example, the orientation or position relationship indicated by "upper", "lower", "front", "back", "left", "right", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. If a feature is referred to as being "set", "fixed", "connected", or "installed" on another feature, it can be directly set, fixed, or connected to the other feature, or it can be indirectly set, fixed, connected, or installed on the other feature.

[0029] In the description of the embodiments of the present invention, if "several" is involved, it means more than one, if "multiple" is involved, it means more than two, if "greater than", "less than" or "exceed" is involved, it should be understood as not including the number itself, if "above", "below" or "within" is involved, it should be understood as including the number itself. If "first" or "second" is involved, it should be understood as being used to distinguish technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In one embodiment of the present invention, referring to Figure 1 , shows a module block diagram of a specific embodiment of the emergency power supply control system in the embodiment of the present invention. Specifically, it includes: a main control module, a power storage module, a charging module, and a discharging module, wherein the main control module is connected to the power storage module, the charging module, and the discharging module respectively, and the charging module, the power storage module, and the discharging module are connected in sequence; the above-mentioned power storage module includes a power storage control unit and a power storage management unit, the input end of the power storage management unit is connected to the output end of the charging module, the output end of the power storage management unit is connected to the input end of the discharging module, the input end of the power storage management unit is also connected to the output end of the power storage control unit, and the input end of the power storage control unit is connected to the main control module.

[0031] This embodiment can realize power control of the power storage module and realize communication among the charging module, the main control module, the power storage module and the discharge module.

[0032] More specifically, during the specific communication process between the charging module and the discharging module and the power storage module, the direct communication unit is the power storage management unit in the power storage module.

[0033] Specifically, refer to Figure 2 The power storage management unit is mainly responsible for the management of the battery pack. The above-mentioned battery pack is a battery pack formed by connecting BT1, BT2 and BT3 in series. The size of the battery pack is not limited to the above number of battery cells. The number of battery cells can be increased or decreased according to the actual application scenario.

[0034] In another embodiment of the present invention, referring to Figure 2 The power storage control unit includes a switch circuit, a main control circuit, and a self-locking power supply circuit, wherein the switch circuit, the main control circuit, and the self-locking power supply circuit are connected in sequence, and the switch circuit and the self-locking power supply circuit are both connected to the power storage management unit.

[0035] Specifically, the switch circuit is connected to the main control module and the power storage module respectively, and is used to control the start-up of the main control module and the power storage module.

[0036] Specifically, the switch signal output by the switch circuit can turn on the power storage module and the main control module at the same time, and after the power storage module is turned on, the battery parameters stored in the power storage module are fed back to the main control module. The main control module simultaneously records the switch signal of the switch module and receives the battery parameters, and controls the discharge mode of the DC discharge module and the AC discharge module connected to the main control module through the recorded switch signal instructions, which can ultimately achieve the following two effects:

[0037] (1) It can provide power for DC and AC emergency loads;

[0038] (2) Real-time monitoring of the discharge status of the load;

[0039] Specifically, in this embodiment, a self-locking control method is adopted between the power storage module and the main control module, which is beneficial to reducing the power supply loss of multiple circuit modules, solving the problems of high standby power consumption and short standby time of emergency power supply products when not in use, and is beneficial to the long-term storage of emergency power supplies.

[0040] The battery parameters include capacity parameters, voltage parameters, and temperature parameters, but are not limited to the above battery parameters and may also include other battery-related parameters.

[0041] The above-mentioned main control circuit includes: a first main control chip 60, a third main control chip 40, and a second power supply chip 130. The output end of the above-mentioned first main control chip 60 is connected to the input end of the power storage management unit, the output end of the power storage management unit is connected to the input end of the second power supply chip 130, and the output end of the second power supply chip 130 is connected to the third main control chip 40.

[0042] The self-locking power supply circuit includes: a first diode D5, a third resistor R17, a fourth resistor R18, a fifth resistor R13, a sixth resistor R14, a first transistor Q2, a first switch tube M3, and a first power supply chip 140. The first end of the first diode D5 is connected to the first main control chip 60, the second end of the first diode D5 is connected to the first end of the third resistor R17, the second end of the third resistor R17 is respectively connected to the base of the first transistor Q2 and the first end of the fourth resistor R18, the second end of the fourth resistor R18 is connected to the emitter of the first transistor Q2, the collector of the first transistor Q2 is connected to the first end of the sixth resistor R14, the second end of the sixth resistor R14 is respectively connected to the first end of the fifth resistor R13 and the third end of the first switch tube M3, the second end of the fifth resistor R13 is connected to the second end of the first switch tube M3, the first end of the first switch tube M3 is connected to the second pin of the first power supply chip 140, the first pin of the first power supply chip 140 is connected to the emitter of the first transistor Q2, and the third pin of the first power supply chip 140 is connected to the first main control chip 60.

[0043] The above-mentioned switching circuit includes: a first switch S1, a second switch S2, a thirty-seventh resistor R12, a thirty-eighth resistor R15, a thirty-ninth resistor R16, a second voltage zener diode ZD2, a fifth diode D4, and a sixth diode D6. The first end of the sixth diode D6 is connected to the third main control chip 40, and the second end of the sixth diode D6 is connected to the second end of the fifth diode D4. The first end of the fifth diode D4 is respectively connected to the first end of the thirty-eighth resistor R15 and the first end of the first switch S1, the second end of the thirty-eighth resistor R15 is respectively connected to the first end of the thirty-ninth resistor R16 and the first end of the second switch S2, the second end of the thirty-ninth resistor R16 is respectively connected to the first end of the second voltage zener diode ZD2 and the ground, the second end of the second voltage zener diode ZD2, the second end of the first switch S2, and the second end of the second switch S2 are all connected to the first end of the thirty-seventh resistor R12, and the second end of the thirty-seventh resistor R12 is connected to the positive electrode of the power storage management unit.

[0044] Specifically, when the first switch S1 is closed, the first switch is connected to the positive pole of the power supply through the thirty-seventh resistor R12, the contactor diode D4 is turned on, and the first transistor Q2 is controlled to be turned on through the third resistor R17. Since the first switch tube M3 is controlled by the first transistor Q2, the first switch tube M3 is also turned on and the first power supply chip 140 supplies power to the first main control chip 60. At this time, the first main control chip 60 outputs a high level from the pin KEY_LOCK to turn on the first diode D5, and turns on the first transistor Q2 and the first switch tube M3. The first power supply chip 140 is controlled by the first switch tube M3 and is also in a conducting state at this time. The first main control chip completes a complete self-locking function.

[0045] Specifically, when the emergency power supply is started, the first switch S1 or the second switch S2 is closed and connected to the KEY_D pin of the third main control 40, and the DC output power or AC output power is determined according to the different level values ​​recognized by the KEY_D pin of the third main control 40. It can be understood that a thirty-eighth resistor R15 and a thirty-ninth resistor R16 are connected between the first switch S1, the second switch S2 and the ground for voltage division detection, so that the level values ​​received by the third main control 40 are different, so that the level value of the output signal can be effectively determined, thereby further controlling the first main control chip 60 and the power storage management unit. At this time, the power storage The management unit can control the switch tube on the power storage management unit to be turned on or off according to the level signal from the first main control chip 60 and the third main control chip 40. When the emergency power supply is normally powered, the switch tube M8 and the switch tube M9 are in the on state, and output DC power and AC power can be provided at this time. It can be understood that M8 and M9 are turned on at the same time when charging. When the charging power reaches a predetermined threshold, the above-mentioned battery management unit turns off the switch tube M9 to protect the battery pack in real time. The predetermined threshold is generally the battery full state value. The KEY_D pin on the third main control chip 40 can be regarded as a switch signal detection pin.

[0046] Specifically, the sixth diode D6 is a charging wake-up function. Specifically, when the DC input module has input, because the first pin and the second pin of the second power supply chip 130 are respectively connected to the negative pole and the positive pole of the DC input module, the second power supply chip 130 supplies power to the third main control chip 40 at this time, and the sixth diode D6 is turned on through the CHRG_AWAKE pin of the third main control chip 40, thereby waking up the above-mentioned self-locking function.

[0047] The first resistor RT1 in the circuit is a thermistor, which together with the second resistor R20 plays the role of voltage division to detect the temperature of the circuit.

[0048] Specifically, the battery management unit 70 connected to the power control unit in this embodiment is a commonly used battery management unit in the prior art. Any battery management unit that can achieve the corresponding or same function as this embodiment can replace the battery management unit in this embodiment.

[0049] Specifically, in the standby state, it is triggered by the third main control chip 40, and the standby signal is fed back to the first main control chip 60 through the first communication module 50. At this time, the first main control chip 60 can turn off the above-mentioned self-locking power supply circuit through the KEY_LOCK pin, and at the same time control the disconnection of the above-mentioned battery management unit through the BMS_CTL pin of the first main control chip 60, which effectively reduces the power supply loss of the circuit module, solves the problem of high standby power consumption and short standby time of emergency power supply products when not in use, and is conducive to the long-term storage of emergency power supplies.

[0050] In another embodiment of the present invention, the discharge module in the above embodiment is specifically designed. Specifically, the discharge module in the above embodiment is designed to include an AC discharge module and a DC discharge module.

[0051] Specifically, the AC discharge module and the DC discharge module are connected to the main control module and the power storage module at the same time; the AC discharge module and the DC discharge module can upload corresponding discharge status signals to the main control module while discharging, so that the main control module can manage and monitor the AC discharge module and the DC discharge module in real time. The discharge status signal includes a discharge voltage signal, a discharge current signal, a discharge power signal, and a discharge temperature signal, but is not limited to the above discharge status signals, and other discharge status signals can also be added according to actual conditions.

[0052] Specifically, this embodiment designs the AC discharge module in the above embodiment, and the above AC discharge module includes a DC-AC conversion unit, an AC sampling unit, and an AC output unit. The DC-AC conversion unit is connected to the above power storage management unit, and the above DC-AC conversion unit, AC sampling unit, and AC output unit are connected in sequence. The above DC-AC conversion unit and AC sampling unit are both connected to the above main control module.

[0053] Specifically, this embodiment can realize real-time monitoring of the AC discharge module by the main control module. More specifically, it can realize real-time monitoring of the DC-AC conversion unit and the AC sampling unit in the AC discharge module by the main control module, so as to control and protect the AC discharge module in real time and reduce the disadvantage of normal discharge failure due to faults.

[0054] This embodiment also specifically designs the DC discharge module.

[0055] Specifically, the DC discharge module includes a DC output protection unit and a DC output unit. The DC output protection unit is connected to the main control module and the power storage module respectively, and the DC output protection unit is also connected to the DC output unit.

[0056] This embodiment can enable the main control module to monitor the signal of the DC discharge module, thereby making the DC discharge module signal stable and improving the DC output protection capability to ensure the normal use of the emergency power supply DC interface.

[0057] In another embodiment of the present invention, this embodiment specifically designs the charging module in the above embodiment.

[0058] Specifically, the charging module includes a DC input unit, a DC input protection unit, and a DC-DC conversion unit which are connected in sequence, and the output end of the DC-DC conversion unit is respectively connected to the above-mentioned power storage module and the above-mentioned main control module.

[0059] Specifically, the DC charging module is connected to the main control module and the power storage module respectively. The DC charging module converts DC power of different voltage segments or unstable DC power into stable DC power, provides power to the power storage module and stores the power at the same time. At the same time, the DC charging module feeds back the charging status signal to the main control module, and the main control module manages and monitors the charging status of the DC charging module in real time, wherein the charging status signal includes a charging voltage signal, a charging current signal, and a charging temperature signal, but is not limited to the above charging status signals, and also includes other charging status signals according to actual applications.

[0060] In another embodiment of the present invention, a display module is added to the above embodiment, and the display module is connected to the main control module and is used to display battery parameter information and warning information.

[0061] Specifically, the display module is connected to the main control module and can display corresponding emergency warning prompts so that users can obtain the real-time working status of the emergency power supply in real time, prevent uncertain failures caused by the use of the emergency power supply, and effectively and quickly resolve emergency events.

[0062] The above-mentioned emergency warning prompts include charging status warning, discharging status warning, and battery status warning, but are not limited to the above status warnings, and may also include other status warnings; the above-mentioned emergency events include earthquakes, typhoons, and rescue, but are not limited to the above emergency events, and may also include other natural disasters or power outages caused by human factors.

[0063] Specifically, the AC sampling unit includes a second main control chip 100, a twentieth resistor R35, a twenty-first resistor R32, a twenty-second resistor R36, a twenty-third resistor R39, a twenty-fourth resistor R40, and a second capacitor C4. The first end of the twentieth resistor R35 is connected to the first end of the DC-AC conversion unit 80, the first end of the twentieth resistor R35 is also connected to the first end of the twenty-first resistor R32, the second end of the twentieth resistor R35 is connected to the first end of the twenty-second resistor R36, the second end of the twenty-first resistor R32 and the second end of the twenty-second resistor R36 are respectively connected to the second main control chip 100, the first end of the twenty-third resistor R39 is connected to the second end of the DC-AC conversion unit 80, the second end of the twenty-third resistor R39 is respectively connected to the second main control chip 100, the first end of the second capacitor C4, and the first end of the twenty-fourth resistor R40, the second end of the second capacitor C4 and the second end of the twenty-fourth resistor R40 are connected to the first end of the DC-AC conversion unit 80.

[0064] The first terminal N of the DC-AC conversion unit 80 is a neutral line, and the second terminal L is a live line.

[0065] Specifically, the AC sampling circuit also includes a power supply unit 110, a current sampling unit consisting of a twentieth resistor R35, a twenty-first resistor R32, and a twenty-second resistor R36, a voltage sampling unit consisting of a twenty-third resistor R39, a twenty-fourth resistor R40, and a second capacitor C4, and a second main control chip 100; the input end of the power supply unit 110 is connected to the output end of the DC-AC conversion unit 80, and the power supply unit 110 supplies power to the second main control chip 100 by directly connecting to the AC side; the current sampling unit is used to detect the current at the AC output end; the voltage sampling unit is used to detect the voltage at the AC output end; the second main control chip 100 feeds back the current and voltage signals of the current sampling unit and the voltage sampling unit to the third main control chip 40 through the second communication circuit 90, and the third main control chip 40 receives the current and voltage signals at the AC output end and controls the DC-AC conversion circuit through the INV_CTL port.

[0066] Specifically, the output end of the AC sampling unit is connected to the AC output unit, the neutral line interface AC_N1 of the AC output unit is connected to the first end N of the DC-AC conversion unit 80, and the live line interface AC_L1 of the AC output unit is connected to the second end L of the DC-AC conversion unit 80.

[0067] Specifically, the DC output protection unit includes: a second power supply chip 130, a twenty-fifth resistor R22, a twenty-sixth resistor R23, a twenty-seventh resistor R33, a twenty-eighth resistor R34, a twenty-ninth resistor R37, a thirtieth resistor R38, a thirty-first resistor R28, a thirty-second resistor R27, a thirty-third resistor R25, a thirty-fourth resistor R24, a thirty-fifth resistor R30, a thirty-sixth resistor R31, a third capacitor C1, a fourth capacitor C2, a fifth capacitor C3, a fourth switch tube M4, a fifth switch tube M5, a third transistor Q3, and a fourth transistor Q 4, the first end of the third capacitor C1, the first end of the twenty-fifth resistor R22, and the first end of the twenty-sixth resistor R23 are respectively connected to the third main control chip 40, the second end of the third capacitor C1 and the second end of the twenty-sixth resistor R23 are both connected to the first end of the second power supply chip 130, the second end of the twenty-fifth resistor R22 is connected to the second end of the second power supply chip 130, the first end of the fourth capacitor C2, the first end of the twenty-seventh resistor R33, and the first end of the twenty-eighth resistor R34 are all connected to the third main control chip 40, the second end of the fourth capacitor C2 and the second end of the twenty-eighth resistor R34 are both connected to the second power supply chip The first end of the chip 130 is connected, the second end of the twenty-seventh resistor R33 is connected to the second end of the fifth switch tube M5, the third end of the fifth switch tube M5 is connected to the first end of the thirty-first resistor R28, the second end of the thirty-first resistor R28 is connected to the collector of the fourth triode Q4, the emitter of the fourth triode Q4 is connected to the first end of the thirty-sixth resistor R31, the second end of the thirty-sixth resistor R31 is connected to the base of the fourth triode Q4, the base of the fourth triode Q4 is connected to the first end of the thirty-fifth resistor R30, the second end of the thirty-fifth resistor R30 is connected to the third main control chip 40, the first end of the fifth switch tube M5 is connected to the fourth The first end of the switch tube M4 and the second end of the fourth switch tube M4 are connected to the second end of the second power supply chip 130, the third end of the fourth switch tube M4 is connected to the first end of the thirty-second resistor R27, the second end of the thirty-second resistor R27 is connected to the collector of the third triode Q3, the emitter of the third triode Q3 and the first end of the thirty-third resistor R25 are respectively connected to the first end of the second power supply chip 130, the second end of the thirty-third resistor R25 is connected to the base of the third triode Q3, the base of the third triode Q3 is connected to the first end of the thirty-fourth resistor R24, and the second end of the thirty-fourth resistor R24 ​​is connected to the third main control chip 40.

[0068] Among them, the thirty-first resistor R28 and the thirty-second resistor R27 are driving resistors, and the fourth switch tube M4 is controlled by the third triode Q3. It can be understood that the fifth switch tube M5 is controlled by the fourth triode Q4. When the third triode Q3 is turned on, the corresponding fourth switch tube M4 is turned on. Similarly, when the fourth triode Q4 is turned on, the fifth switch tube M5 is turned on. When the third triode Q3 is turned off, the corresponding fourth switch tube M4 is turned off. When the fourth triode Q4 is turned off, the fifth switch tube M5 is turned off.

[0069] Specifically, the above-mentioned DC output protection circuit is connected to the main control module, wherein the DC output protection circuit includes an input voltage sampling unit composed of a twenty-fifth resistor R22, a twenty-sixth resistor R23, and a third capacitor C1, an output voltage sampling unit composed of a twenty-seventh resistor R33, a twenty-eighth resistor R34, and a fourth capacitor C2, an output current sampling unit composed of a twenty-ninth resistor R37, a thirtieth resistor R38, and a fifth capacitor 85, and an output control unit composed of a fourth switch tube M4, a fifth switch tube M5, a third transistor Q3, and a fourth transistor Q4; the DC output protection circuit is controlled by the third main control chip 40 in the main control module.

[0070] Specifically, the Vdc1_D port of the third main control chip 40 is connected to the input voltage sampling unit to detect the voltage at the input end of the DC output protection circuit, so as to prevent the storage module from under-voltage discharge and thus causing damage to the energy storage battery due to power shortage; the Vdc2_D port is connected to the output voltage sampling unit to detect the voltage at the DC output end; when the output control unit is cut off, the Vdc2_D port first detects the voltage at the DC output end to determine whether there is an external voltage input at the DC output end, so as to prevent the user from connecting the external voltage to cause voltage backflow or overvoltage breakdown damage at the DC output end, thereby solving the overvoltage protection of the DC output end; the Idc1_D port is connected to the output current sampling unit to detect the current at the DC output end; the DC1_CTL1 and DC1_CTL2 ports are connected to the output control unit to control the conduction and cutoff of the output control unit; after the Vdc2_D port detects that there is no external voltage connected to the DC output end through the output voltage sampling unit, the DC1_ The CTL1 port outputs a signal to turn on the fourth switch tube M4 in the output control unit. At this time, the BT+ signal connected to the input end of the fourth switch tube M4 is output to the input end of the fifth switch tube M5 through the fourth switch tube M4. Since the fifth switch tube M5 is in the cut-off state, the BT+ signal can only be output to the DC output end through the internal diode of the fifth switch tube M5. At the same time, the Idc1_D port detects the current signal in the output current sampling unit to determine whether there is a load connected to the DC output end or the size of the connected load; when it is detected that there is a load connected to the DC output end, the DC1_CTL2 port outputs a signal to turn on the fifth switch tube M5 in the output control unit. At the same time, the Idc1_D port monitors and detects the current signal in the output current sampling unit in real time to determine whether there is a short circuit or overcurrent at the DC output end, and controls the output control unit to quickly shut down the DC output end through the DC1_CTL1 and DC1_CTL2 ports to solve the short circuit and overcurrent problems at the DC output end.

[0071] It can be understood that after passing through the DC output protection unit, the power signal will provide a DC power connection port for the external load through the DC output unit 20.

[0072] Specifically, the DC input protection unit includes a ninth resistor R1, a tenth resistor R2, an eleventh resistor R3, a twelfth resistor R4, a thirteenth resistor R5, a fourteenth resistor R6, a fifteenth resistor R7, a sixteenth resistor R8, a seventeenth resistor R9, an eighteenth resistor R10, a nineteenth resistor R11, a second transistor Q1, a second diode D1, a third diode D2, a fourth diode D3, a voltage regulator IC1, an optocoupler PC1, a first voltage regulator diode ZD1, a second switch tube M1, a third switch tube M2, a first capacitor CE1, a first end of the ninth resistor R1 is connected to the first end of the DC input unit, and a second end of the ninth resistor R1 is connected to the tenth resistor R2 first end, the tenth resistor R2 first end is also connected to the first end of the regulator IC1, the tenth resistor R2 second end and the regulator IC1 second end are respectively connected to the DC input unit second end, the tenth resistor R2 first end is also connected to the eleventh resistor R3 first end, the eleventh resistor R3 second end is connected to the collector of the second transistor Q1, the regulator IC1 third end is connected to the twelfth resistor R4 first end, the twelfth resistor R4 second end is connected to the second transistor Q1 base, the second transistor Q1 base is also connected to the thirteenth resistor R5 first end, the thirteenth resistor R5 second end is connected to the second transistor Q1 emitter, the thirteenth resistor R5 second end is also connected to the second end of the second diode D1, the The first end of the second diode D1 is connected to the first end of the ninth resistor R1, the collector of the second transistor Q1 is also connected to the first end of the third diode D3, the second end of the third diode D3 is connected to the first end of the fourteenth resistor R6, the second end of the fourteenth resistor R6 is connected to the second end of the DC input unit, the second end of the third diode D3 is also connected to the second pin of the photoelectric coupler PC1, the first pin of the photoelectric coupler PC1 is connected to the second end of the fourth diode D3, the first end of the fourth diode D3 is connected to the first end of the sixteenth resistor R8, the second end of the sixteenth resistor R8 is connected to the fourth pin of the photoelectric coupler PC1, and the third pin of the photoelectric coupler PC1 is connected to the first end of the seventeenth resistor R9 and the eighteenth resistor R1 respectively. 0 and the second end of the first Zener diode ZD1, the second end of the eighteenth resistor R10 is connected to the first end of the nineteenth resistor R11, the second end of the nineteenth resistor R11 is connected to the second end of the first capacitor CE1, the first end of the nineteenth resistor R11 is also connected to the third end of the third switch tube M2, the second end of the third switch tube M2 is connected to the second end of the first capacitor CE1, the first end of the third switch tube M2 is connected to the first end of the second switch tube M1, the second end of the second switch tube M1 is connected to the first end of the fifteenth resistor R7, the second end of the fifteenth resistor R7 is respectively connected to the second end of the seventeenth resistor R9 and the third end of the second switch tube M1, and the second end of the third switch tube M2 is also connected to the DC-DC conversion unit.

[0073] Specifically, the first end and the second end of the first capacitor CE1 are also connected to the DC-DC conversion unit 20, respectively, which plays a good filtering role. The ninth resistor R1 and the tenth resistor R2 mainly play a role in limiting the voltage. The eleventh resistor R3 and the ninth resistor R1 and the tenth resistor R2 can form a voltage loop, thereby playing a good role in overvoltage protection. The twelfth resistor R4 is a current limiting resistor of the voltage regulator IC1, and can also be regarded as a bias resistor of the second transistor Q1, which can be used to adjust the bias current of the base of the second transistor Q1, so that the second transistor Q1 is controlled at a suitable working point.

[0074] Specifically, refer to Figure 2 , after the power signal is input from the DC input terminal 10, it is transmitted to the DC-DC conversion unit 20 after passing through the DC protection unit, wherein the DC input protection unit includes a voltage sampling unit composed of a ninth resistor R1, a tenth resistor R2, and a voltage regulator IC1, a control unit composed of a twelfth resistor R4, a thirteenth resistor R5, a fourteenth resistor R6, a third diode D2, and a second triode Q1, a driving unit composed of a fourth diode D3, a fifteenth resistor R7, a sixteenth resistor R8, a seventeenth resistor R9, a voltage regulator diode 71, and a photocoupler PC1, and a switch unit composed of a second switch tube M1 and a third switch tube M2. Among them, the fifteenth resistor R7 and the sixteenth resistor R8 are the driving resistors of the first switch tube 31, and after the first switch tube 31 is turned on, the battery voltage is detected through the above-mentioned seventeenth resistor R9 and eighteenth resistor R10. The eleventh resistor R3 plays a role in voltage compensation, and can play a role in overvoltage protection when the third diode D2 is turned on. The twelfth resistor R4 plays a role in current limiting for the voltage regulator IC1. The voltage regulator IC1 in this embodiment uses TL431, and other programmable voltage regulators can also be used. The DC-DC conversion unit 20 uses a commonly used DC-DC conversion unit, and any device or apparatus that can play the role of DC-DC conversion in this scheme can be replaced.

[0075] Specifically, voltage sampling can change the highest voltage protection point of the DC input terminal by adjusting the resistance values ​​of the ninth resistor R1 and the tenth resistor R2; the control function is to control the conduction and cutoff of the input terminal of the photoelectric coupler PC1 by the on-off of the second transistor Q1; the driving unit drives the conduction and cutoff of the second switch tube M1 and the third switch tube M2 that act as a switch by the on-off of the photoelectric coupler PC1, so as to solve the problem that the user mistakenly inserts a high-voltage input device into the DC input terminal, causing the circuit connected to the DC input to be damaged by high-voltage breakdown; at the same time, it can solve the problem that the user inserts an input device with opposite polarity into the DC input terminal and causes damage to the circuit. Since the input terminal of the photoelectric coupler PC1 is connected to the DC input terminal, when a voltage with opposite polarity is connected, the input terminal of the photoelectric coupler PC1 will be reversely cut off, and the photoelectric coupler PC1 cannot work and the above-mentioned circuit that acts as a switch is cut off. It can effectively prevent the internal circuit of the emergency power supply connected to the DC input terminal from being burned and damaged by the voltage input with opposite polarity.

[0076] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. An emergency power supply control system, characterized in that: include: A power storage module, a charging module, and a discharging module, wherein the charging module, the power storage module, and the discharging module are connected in sequence; the power storage module comprises a power storage control unit and a power storage management unit, wherein the input end of the power storage management unit is connected to the output end of the charging module, the output end of the power storage management unit is connected to the input end of the discharging module, and the input end of the power storage management unit is also connected to the output end of the power storage control unit; The power storage control unit includes a switch circuit, a main control circuit, and a self-locking power supply circuit. The switch circuit, the main control circuit, and the self-locking power supply circuit are connected in sequence. The switch circuit and the self-locking power supply circuit are both connected to the power storage management unit. The main control circuit is respectively connected to the power storage module, the charging module, and the discharging module. The main control circuit comprises: a first main control chip, a third main control chip, and a second power supply chip, wherein the output end of the first main control chip is connected to the input end of the power storage management unit, the output end of the power storage management unit is connected to the input end of the second power supply chip, and the output end of the second power supply chip is connected to the third main control chip; The self-locking power supply circuit includes: a first diode, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first transistor, a first switch tube, and a first power supply chip. The first end of the first diode is connected to the first main control chip, the second end of the first diode is connected to the first end of the third resistor, the second end of the third resistor is respectively connected to the base of the first transistor and the first end of the fourth resistor, the second end of the fourth resistor is connected to the emitter of the first transistor, the collector of the first transistor is connected to the first end of the sixth resistor, the second end of the sixth resistor is respectively connected to the first end of the fifth resistor and the third end of the first switch tube, the second end of the fifth resistor is connected to the second end of the first switch tube, the first end of the first switch tube is connected to the second pin of the first power supply chip, the first pin of the first power supply chip is connected to the emitter of the first transistor, and the third pin of the first power supply chip is connected to the first main control chip; The switching circuit includes: a first switch, a second switch, a thirty-seventh resistor, a thirty-eighth resistor, a thirty-ninth resistor, a second voltage-stabilizing diode, a fifth diode, and a sixth diode. The first end of the sixth diode is connected to the third main control chip, the second end of the sixth diode is connected to the second end of the fifth diode, the first end of the fifth diode is respectively connected to the first end of the thirty-eighth resistor and the first end of the first switch, the second end of the thirty-eighth resistor is respectively connected to the first end of the thirty-ninth resistor and the first end of the second switch, the second end of the thirty-ninth resistor is respectively connected to the first end of the second voltage-stabilizing diode and the ground, the second end of the second voltage-stabilizing diode, the second end of the first switch, and the second end of the second switch are all connected to the first end of the thirty-seventh resistor, and the second end of the thirty-seventh resistor is connected to the positive electrode of the power storage management unit.

2. An emergency power supply control system according to claim 1, characterized in that: The discharge module includes an AC discharge module and a DC discharge module. The AC discharge module includes a DC-AC conversion unit, an AC sampling unit, and an AC output unit. The DC-AC conversion unit is connected to the power storage management unit. The DC-AC conversion unit, the AC sampling unit, and the AC output unit are connected in sequence. The DC-AC conversion unit and the AC sampling unit are both connected to the main control circuit. The DC discharge module includes a DC output protection unit and a DC output unit. The DC output protection unit is connected to the main control circuit, and the DC output protection unit is also connected to the DC output unit.

3. An emergency power supply control system according to claim 2, characterized in that: The charging module comprises a DC input unit, a DC input protection unit, and a DC-DC conversion unit which are connected in sequence, and an output end of the DC-DC conversion unit is connected to the main control circuit.

4. An emergency power supply control system according to claim 2, characterized in that: The AC sampling unit includes: a second main control chip, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, and a second capacitor, wherein a first end of the twentieth resistor is connected to a first end of the DC-AC conversion unit, the first end of the twentieth resistor is also connected to a first end of the twenty-first resistor, a second end of the twentieth resistor is connected to a first end of the twenty-second resistor, a second end of the twenty-first resistor and a second end of the twenty-second resistor are both connected to the second main control chip, a first end of the twenty-third resistor is connected to a second end of the DC-AC conversion unit, a second end of the twenty-third resistor is respectively connected to the second main control chip, a first end of the second capacitor, and a first end of the twenty-fourth resistor, and a second end of the second capacitor and a second end of the twenty-fourth resistor are both connected to the first end of the DC-AC conversion unit.

5. An emergency power supply control system according to claim 2, characterized in that: The DC output protection unit includes: a second power supply chip, a twenty-fifth resistor, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, a twenty-ninth resistor, a thirtieth resistor, a thirty-first resistor, a thirty-second resistor, a thirty-third resistor, a thirty-fourth resistor, a thirty-fifth resistor, a thirty-sixth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a fourth switch tube, a fifth switch tube, a third transistor, and a fourth transistor. The first end of the third capacitor, the first end of the twenty-fifth resistor, and the first end of the twenty-sixth resistor are all connected to the third main control chip, the second end of the third capacitor and the second end of the twenty-sixth resistor are all connected to the first end of the second power supply chip, the second end of the twenty-fifth resistor is connected to the second end of the second power supply chip, the first end of the fourth capacitor, the first end of the twenty-seventh resistor, and the first end of the twenty-eighth resistor are all connected to the third main control chip, the second end of the fourth capacitor and the second end of the twenty-eighth resistor are all connected to the first end of the second power supply chip, and the second end of the twenty-seventh resistor is connected to the first end of the second power supply chip. The second end of the fifth switch tube, the third end of the fifth switch tube is connected to the first end of the thirty-first resistor, the second end of the thirty-first resistor is connected to the collector of the fourth transistor, the emitter of the fourth transistor is connected to the first end of the thirty-sixth resistor, the second end of the thirty-sixth resistor is connected to the base of the fourth transistor, the base of the fourth transistor is connected to the first end of the thirty-fifth resistor, the second end of the thirty-fifth resistor is connected to the third main control chip, the first end of the fifth switch tube is connected to the first end of the fourth switch tube, the second end of the fourth switch tube is connected to the second end of the second power supply chip, the third end of the fourth switch tube is connected to the first end of the thirty-second resistor, the second end of the thirty-second resistor is connected to the collector of the third transistor, the emitter of the third transistor and the first end of the thirty-third resistor are both connected to the first end of the second power supply chip, the second end of the thirty-third resistor is connected to the base of the third transistor, the base of the third transistor is connected to the first end of the thirty-fourth resistor, and the second end of the thirty-fourth resistor is connected to the third main control chip.

6. An emergency power supply control system according to claim 2, characterized in that: The DC input protection unit includes a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a second triode, a second diode, a third diode, a fourth diode, a voltage regulator, a photocoupler, a first voltage regulator diode, a second switch tube, a third switch tube, and a first capacitor. The first end of the ninth resistor is connected to the first end of the DC input unit, the second end of the ninth resistor is connected to the first end of the tenth resistor, the first end of the tenth resistor is also connected to the first end of the voltage regulator, and the tenth resistor The second end and the second end of the voltage regulator are both connected to the second end of the DC input unit, the first end of the tenth resistor is also connected to the first end of the eleventh resistor, the second end of the eleventh resistor is connected to the collector of the second transistor, the third end of the voltage regulator is connected to the first end of the twelfth resistor, the second end of the twelfth resistor is connected to the base of the second transistor, the base of the second transistor is also connected to the first end of the thirteenth resistor, the second end of the thirteenth resistor is connected to the emitter of the second transistor, the second end of the thirteenth resistor is also connected to the second end of the second diode, and the first end of the second diode is connected to the first end of the ninth resistor The collector of the second transistor is also connected to the first end of the third diode, the second end of the third diode is connected to the first end of the fourteenth resistor, the second end of the fourteenth resistor is connected to the second end of the DC input unit, the second end of the third diode is also connected to the second pin of the photoelectric coupler, the first pin of the photoelectric coupler is connected to the second end of the fourth diode, the first end of the fourth diode is connected to the first end of the sixteenth resistor, the second end of the sixteenth resistor is connected to the fourth pin of the photoelectric coupler, the third pin of the photoelectric coupler is respectively connected to the first end of the seventeenth resistor, the first end of the eighteenth resistor and the second end of the first voltage regulator diode, the second end of the eighteenth resistor is connected to the first end of the nineteenth resistor, the second end of the nineteenth resistor is connected to the second end of the first capacitor, the first end of the nineteenth resistor is also connected to the third end of the third switch tube, the second end of the third switch tube is connected to the second end of the first capacitor, the first end of the third switch tube is connected to the first end of the second switch tube, the second end of the second switch tube is connected to the first end of the fifteenth resistor, the second end of the fifteenth resistor is respectively connected to the second end of the seventeenth resistor and the third end of the second switch tube, and the second end of the third switch tube is also connected to the DC-DC conversion unit.

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