UPS power supply system

Abstract

The utility model relates to the technical field of uninterruptible power supplies, and provides a UPS power supply system, which comprises a charging module, a discharging module, a storage battery detection module, a main control unit and a timing module, the first end of the charging module is connected with the rectifier, the second end of the charging module is connected with the storage battery, and the control end of the charging module is connected with the main control unit; the first end of the storage battery detection module is connected with a storage battery, and the second end of the storage battery detection module is connected with the main control unit; the first end of the discharging module is connected with the storage battery, and the second end of the discharging module is connected with the main control unit; the timing module is connected with the master control unit. According to the technical scheme, the problem that the service life of the storage battery is affected due to the fact that the electric quantity in the storage battery in a traditional UPS system is in a full charge state for a long time is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of uninterruptible power supply, in particular to a UPS power supply system. Background Art

[0002] Uninterruptible Power Supply (UPS) is an uninterruptible power supply with energy storage device. It is mainly used to provide uninterruptible power supply to some equipment with high requirements on power supply stability. UPS power supply system is mainly composed of batteries, rectifiers, inverters and static switches. When the grid input is normal, UPS stabilizes the grid voltage and supplies it to the load. At this time, UPS is an AC voltage stabilizer, and it also charges the battery through the rectifier; when the grid is interrupted (power outage due to accident), UPS immediately switches the DC power of the battery to 220V AC power to the load through the inverter switching method, so that the load maintains normal operation.

[0003] In traditional UPS power systems, in order to ensure that the battery has enough power to power the load when the power grid is cut off, the battery is kept fully charged for a long time. If the battery is kept fully charged for a long time, the chemical substances inside the battery will gradually solidify, affecting the service life of the battery. Utility Model Content

[0004] The utility model provides a UPS power supply system, which solves the problem in a traditional UPS power supply system that the power in the battery is in a fully charged state for a long time, thus affecting the service life of the battery.

[0005] The technical solution of the utility model is as follows:

[0006] UPS power supply system, including charging module, discharging module, battery detection module, main control unit and timing module;

[0007] The first end of the charging module is used to connect to the rectifier, the second end of the charging module is used to connect to the battery, and the control end of the charging module is connected to the main control unit;

[0008] The first end of the battery detection module is used to connect to the battery, and the second end of the battery detection module is connected to the main control unit;

[0009] The first end of the discharge module is used to connect to the battery, and the second end of the discharge module is connected to the main control unit;

[0010] The timing module is connected to the main control unit.

[0011] Further, the battery detection module in the utility model includes a resistor R8 and a resistor R9;

[0012] The first end of the resistor R8 is connected to the positive electrode of the battery, the negative electrode of the battery is grounded, the second end of the resistor R8 is grounded through the resistor R9, and the second end of the resistor R8 is connected to the main control unit.

[0013] Furthermore, the charging module in the utility model includes a switch tube Q1, a transistor Q6, a variable resistor RP1, a voltage regulator tube U3 and an amplifier U4;

[0014] The first end of the switch tube Q1 is used to connect to the rectifier, and the second end of the switch tube Q1 is connected to the positive electrode of the battery;

[0015] The collector of the transistor Q6 is connected to the first end of the switch tube Q1, the base of the transistor Q6 is connected to the main control unit, the emitter of the transistor Q6 is connected to the first end of the variable resistor RP1, the sliding end of the variable resistor RP1 is connected to the cathode of the voltage regulator tube U3, the anode of the voltage regulator tube U3 is grounded, the second end of the variable resistor RP1 is connected to the inverting input end of the amplifier U4, the non-inverting input end of the amplifier U4 is connected to the second end of the resistor R8, and the output end of the amplifier U4 is connected to the control end of the switch tube Q1.

[0016] Furthermore, the charging module in the utility model further includes a transistor Q5, a controller U2, a resistor R6, a resistor R7, a capacitor C2, a switch tube Q3, a resistor R5 and a resistor R2;

[0017] The base of the transistor Q5 is connected to the output end of the amplifier U4, the emitter of the amplifier U4 is connected to a 5V power supply, the collector of the transistor Q5 is connected to the power supply end of the controller U2, the power supply end of the controller U2 is connected to the discharge end of the controller through the resistor R6, the discharge end of the controller U2 is connected to the first trigger end of the controller U2 through the resistor R7, the first trigger end of the controller U2 is connected to the second trigger end of the controller U2, the second trigger end of the controller U2 is grounded through the capacitor C2, the output end of the controller U2 is connected to the control end of the switch tube Q3, the first end of the switch tube Q3 is connected to the control end of the switch tube Q1, and the second end of the switch tube Q3 is grounded;

[0018] The first end of the resistor R5 is connected to the first end of the switch tube Q1 , the second end of the resistor R5 is connected to the control end of the switch tube Q1 , and the second end of the resistor R5 is grounded through the resistor R2 .

[0019] Furthermore, the charging module in the present invention further includes a resistor R1, a resistor R3 and a transistor Q2;

[0020] The first end of the resistor R1 is used to connect to the rectifier, the second end of the resistor R1 is connected to the first end of the switch tube Q1, the second end of the resistor R1 is connected to the base of the transistor Q2 through the resistor R3, the emitter of the transistor Q2 is connected to the first end of the resistor R1, and the collector of the transistor Q2 is grounded.

[0021] Furthermore, the discharge module in the present invention includes a resistor R12 and a switch tube Q7;

[0022] The first end of the resistor R12 is connected to the positive electrode of the battery, the second end of the resistor R12 is connected to the first end of the switch tube Q7, the second end of the switch tube Q7 is grounded, and the control end of the switch tube Q7 is connected to the main control unit.

[0023] Furthermore, the utility model also includes a power switching module, which includes a voltage regulator U1, a resistor RP2, a transistor Q4 and a relay K1;

[0024] The cathode of the voltage regulator U1 is used to connect to the rectifier, the anode of the voltage regulator U1 is connected to the first end of the variable resistor RP2, the second end of the variable resistor RP2 is grounded, the sliding end of the variable resistor RP2 is connected to the base of the transistor Q4, the collector of the transistor Q4 is connected to the first input end of the relay K1, the emitter of the transistor Q4 is grounded, the second input end of the relay K1 is used to connect to the rectifier, the common end of the relay K1 is used to connect to the inverter, and the normally open end of the relay K1 is connected to the positive electrode of the battery.

[0025] The working principle and beneficial effects of the utility model are:

[0026] In the utility model, in order to prevent the battery from being in a fully charged state for a long time, the timing time is set by the timing module, and the main control unit controls the charging module or the discharging module according to the detection result of the battery detection module to charge and discharge the battery regularly to keep the battery power within an appropriate range, which can better protect the battery and extend its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] Figure 1 It is a structural block diagram of the UPS power supply system in the utility model;

[0029] Figure 2 The present invention is a circuit diagram of a UPS power supply system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to enable people in the technical field to better understand the present solution, the technical solution in the embodiment of the present solution will be clearly described below in conjunction with the drawings in the embodiment of the present solution. Obviously, the described embodiment is an embodiment of a part of the present solution, not all of the embodiments. Based on the embodiments in the present solution, all other embodiments obtained by ordinary technicians in the field without creative work should fall within the scope of protection of the present solution.

[0031] The term "including" and any other variations in the specification and claims of this solution and the above drawings mean "including but not limited to", and is intended to cover non-exclusive inclusions and is not limited to the examples listed in the text. In addition, the terms "first" and "second" are used to distinguish different objects, not to describe a specific order.

[0032] Example 1

[0033] like Figure 1 As shown, this embodiment proposes a UPS power system, including a charging module, a discharging module, a battery B1 detection module, a main control unit and a timing module;

[0034] The first end of the charging module is used to connect to the rectifier, the second end of the charging module is used to connect to the battery B1, and the control end of the charging module is connected to the main control unit;

[0035] The first end of the battery B1 detection module is used to connect to the battery B1, and the second end of the battery B1 detection module is connected to the main control unit;

[0036] The first end of the discharge module is used to connect to the battery B1, and the second end of the discharge module is connected to the main control unit;

[0037] The timing module is connected to the main control unit.

[0038] The uninterruptible power supply system (UPS) mainly includes battery B1, rectifier, inverter and static switch.

[0039] Battery B1: Battery B1 is a device used to store electrical energy in the UPS power system. During normal power supply, the DC power supply charges the battery B1. Once the grid supply is interrupted, the battery B1 will immediately supply power to the inverter to ensure the AC output voltage of the UPS power supply.

[0040] Rectifier: The function of the rectifier is to convert the alternating current (AC) from the grid into direct current (DC), which is then supplied to the inverter or battery B1.

[0041] Inverter: The main function of the inverter is to convert direct current (DC) back into alternating current (AC) for use by the load.

[0042] Static switch: The static switch is a key component in the UPS power system, used to control the switch from the grid to the battery B1. When the grid power supply is normal, the grid provides power to the equipment, and when a problem with the grid is detected, it seamlessly switches to the battery B1 for power supply.

[0043] In a traditional UPS power system, in order to ensure that battery B1 has enough power to supply power to the load when the power grid is cut off, the power of battery B1 is kept fully charged for a long time. The power of battery B1 kept fully charged for a long time will have some adverse effects on battery B1.

[0044] First, a long period of full charge will cause the chemical substances inside the battery to gradually solidify, which will reduce the capacity of battery B1. In addition, when fully charged, lithium ions are most active, and the safety hazard is also the greatest. Therefore, long-term full charge storage may increase safety hazards. On the other hand, full charge storage may also cause the battery to overcharge, which in turn causes battery aging and damage. Moreover, full charge storage may also cause the battery to self-discharge, causing the battery voltage to be too low, thus causing the battery to be scrapped early.

[0045] To this end, in this embodiment, the timing module is used to play a timing role. During the timing period, the battery B1 can self-discharge. After the timing time is reached, the remaining power of the battery B1 is obtained through the battery B1 detection module. The battery B1 detection module is used to detect the remaining power of the battery B1 and convert the remaining power of the battery B1 into a suitable electrical signal and send it to the main control unit. When the voltage of the battery B1 is lower than the set lower limit, the main control unit sends a control instruction to the control end of the charging module. The charging module is used to provide a charging circuit for the battery B1. When charging, the DC signal output by the rectifier is added to the positive electrode of the battery B1 after passing through the charging module to charge the battery B1. When the power of the battery B1 exceeds the set upper limit, the main control unit stops sending control instructions to the charging module. At this time, the battery B1 stops charging because the charging circuit is disconnected.

[0046] After the timing time is reached, if the power level of battery B1 is higher than the set lower limit, the main control unit sends a control instruction to the discharge module, and the discharge module provides a discharge circuit for battery B1 to release the electric energy stored in battery B1. When the voltage of battery B1 is lower than the set lower limit, the main control unit stops sending control instructions to the discharge module, and battery B1 stops discharging to avoid over-discharge of battery B1.

[0047] If the timing time has not arrived and the power level of the battery B1 is lower than the set lower limit, the main control unit will also send a control instruction to the charging module.

[0048] In this embodiment, in order to prevent the battery B1 from being in a fully charged state for a long time, the timing time is set by the timing module, and the main control unit controls the charging module or the discharging module according to the detection result of the battery B1 detection module to regularly charge and discharge the battery B1 to keep the power of the battery B1 within an appropriate range. This can better protect the battery B1 and extend its service life.

[0049] like Figure 2 As shown, in this embodiment, the battery B1 detection module includes a resistor R8 and a resistor R9; the first end of the resistor R8 is connected to the positive electrode of the battery B1, the negative electrode of the battery B1 is grounded, the second end of the resistor R8 is grounded through the resistor R9, and the second end of the resistor R8 is connected to the main control unit.

[0050] In this embodiment, resistors R8 and R9 form a voltage divider circuit for detecting the voltage across the battery B1. The voltage across resistor R9 is taken as a sampling voltage, and the voltage across resistor R9 is sent to the main control unit. The remaining power of battery B1 is determined based on the voltage across resistor R9.

[0051] like Figure 2 As shown, the charging module in this embodiment includes a switch tube Q1, a transistor Q6, a variable resistor RP1, a voltage regulator tube U3 and an amplifier U4;

[0052] The first end of the switch tube Q1 is used to connect to the rectifier, and the second end of the switch tube Q1 is connected to the positive electrode of the battery B1;

[0053] The collector of the transistor Q6 is connected to the first end of the switch tube Q1, the base of the transistor Q6 is connected to the main control unit, the emitter of the transistor Q6 is connected to the first end of the variable resistor RP1, the sliding end of the variable resistor RP1 is connected to the cathode of the voltage regulator tube U3, the anode of the voltage regulator tube U3 is grounded, the second end of the variable resistor RP1 is connected to the inverting input end of the amplifier U4, the non-inverting input end of the amplifier U4 is connected to the second end of the resistor R8, and the output end of the amplifier U4 is connected to the control end of the switch tube Q1.

[0054] In this embodiment, the charging module is used to provide a charging circuit for the battery B1, wherein the amplifier U4 constitutes a comparator. When the battery B1 is sufficiently charged, the base of the transistor Q6 is at a low level, the transistor Q6 is cut off, the inverting input terminal of the amplifier U4 is 0, the output of the amplifier U4 is at a high level, the switch tube Q1 is cut off, and therefore, the charging circuit is disconnected.

[0055] When the power of the battery B1 is lower than the set lower limit, the main control unit will send a high-level signal to the base of the transistor Q6, and the transistor Q6 will be turned on. In this embodiment, the transistor Q6 works in a switching state, and the variable resistor RP1 and the voltage regulator U3 form a voltage regulator circuit. At this time, a stable reference voltage is formed at the inverting input of the amplifier U4. When the power of the battery B1 is lower than the set lower limit, the voltage at the inverting input of the amplifier U4 is greater than the voltage at the same-phase input of the amplifier U4, and the amplifier U4 outputs a low level, the switch Q1 is turned on, and the DC voltage output by the rectifier charges the battery B1 after passing through the switch Q1. When the power of the battery B1 reaches the set upper limit, the amplifier U4 outputs a high level again, the switch Q1 is turned off, and the charging of the battery B1 stops.

[0056] like Figure 2 As shown, the charging module in this embodiment also includes a transistor Q5, a controller U2, a resistor R6, a resistor R7, a capacitor C2, a switch tube Q3, a resistor R5 and a resistor R2; the base of the transistor Q5 is connected to the output end of the amplifier U4, the emitter of the amplifier U4 is connected to the 5V power supply, the collector of the transistor Q5 is connected to the power supply end of the controller U2, the power supply end of the controller U2 is connected to the discharge end of the controller through the resistor R6, the discharge end of the controller U2 is connected to the first trigger end of the controller U2 through the resistor R7, the first trigger end of the controller U2 is connected to the second trigger end of the controller U2, the second trigger end of the controller U2 is grounded through the capacitor C2, the output end of the controller U2 is connected to the control end of the switch tube Q3, the first end of the switch tube Q3 is connected to the control end of the switch tube Q1, and the second end of the switch tube Q3 is grounded; the first end of the resistor R5 is connected to the first end of the switch tube Q1, the second end of the resistor R5 is connected to the control end of the switch tube Q1, and the second end of the resistor R5 is grounded through the resistor R2.

[0057] In this embodiment, when the battery B1 is not used for a long time or the power of the battery B1 is very low, the internal resistance of the battery B1 is very small, almost zero. If it is charged directly at this time, the current borne by the battery B1 will be very large, which can easily cause permanent damage to the battery. For this reason, this embodiment uses pulse charging to charge the battery B1.

[0058] Among them, the controller U2, the resistor R6, the resistor R7 and the capacitor C2 constitute a pulse generating circuit. In this embodiment, a 555 timer is used as the controller U2. When the battery B1 is fully charged, the amplifier U4 outputs a high level, the transistor Q5 is cut off, the power supply end of the controller U2 is not powered on, the controller U2 outputs a low level, the switch tube Q3 is cut off, and the voltage at the control end of the switch tube Q1 is approximately equal to the voltage at the first end of the switch tube Q1. The switch tube Q1 is cut off, and the battery B1 is not charged.

[0059] When the power of the battery B1 is lower than the set lower limit, the amplifier U4 outputs a low level, the transistor Q5 is turned on, and the transistor Q5 also works in a switch state. At this time, the controller U2 is powered on and outputs a pulse signal. When the pulse signal is low level, the switch tube Q3 is turned off, and the switch tube Q1 is also turned off. When the pulse signal is high level, the switch tube Q3 is turned on. After the resistor R5 and the resistor R2 divide the voltage, the voltage difference between the control end of the switch tube Q1 and the first end of the switch tube Q1 is less than the start voltage of the switch tube Q1. Therefore, the switch tube Q1 is turned on, and the DC signal output by the rectifier charges the battery B1 after passing through the switch tube Q1. This forms a cycle until the battery B1 is fully charged.

[0060] like Figure 2 As shown, the charging module in this embodiment also includes a resistor R1, a resistor R3 and a transistor Q2; the first end of the resistor R1 is connected to the rectifier, the second end of the resistor R1 is connected to the first end of the switch tube Q1, the second end of the resistor R1 is connected to the base of the transistor Q2 through the resistor R3, the emitter of the transistor Q2 is connected to the first end of the resistor R1, and the collector of the transistor Q2 is grounded.

[0061] During the charging process of battery B1, if the charging current increases, it will have an impact on battery B1, such as:

[0062] If the charging current is too large, the charging speed of battery B1 will be accelerated, which will increase the number of cycles of battery B1 and shorten its service life. If the charging current is too large, the chemical reaction inside the battery will be accelerated, which will increase the consumption of electrolyte and lead to a decrease in battery capacity. If the charging current is too large, the battery may overheat. Long-term high-temperature operation may shorten the battery life and may even cause thermal runaway, resulting in battery explosion or fire. In addition, large current may also cause uneven deposition of lithium ions on the electrodes, forming lithium metal deposits, which may cause internal short circuits in the battery.

[0063] Therefore, in this embodiment, the resistor R1, the resistor R3 and the transistor Q2 constitute an overcurrent protection circuit. During the charging process of the battery B1, when the charging current is normal, the base of the transistor Q2 generates a voltage that is greater than the conduction voltage of the transistor Q2. The transistor Q2 is turned on and works in an amplification state. The transistor Q2 plays a shunt role. When the charging current of the battery B1 is normal, the shunt of the transistor Q2 is small. When the charging current increases, the base current of the transistor Q2 increases, thereby causing the collector current of the transistor Q2 to increase, that is, the shunt of the transistor Q2 increases, thereby suppressing the charging current of the battery B1 from increasing. Avoiding the bad influence on the battery B1 caused by excessive charging current.

[0064] like Figure 2As shown, in this embodiment, the discharge module includes a resistor R12 and a switch tube Q7; the first end of the resistor R12 is connected to the positive electrode of the battery B1, the second end of the resistor R12 is connected to the first end of the switch tube Q7, the second end of the switch tube Q7 is grounded, and the control end of the switch tube Q7 is connected to the main control unit.

[0065] In this embodiment, in order to improve the service life and performance of the battery B1, when the battery B1 is not used for a long time, it is necessary to charge and discharge the battery B1 regularly.

[0066] When the timing time of the timing module is reached, if the power level of the battery B1 is higher than the set lower limit, the main control unit sends a low-level signal to the control end of the switch tube Q7, and the switch tube Q7 is turned on. At this time, the battery B1 discharges through the switch tube Q7. When the power level of the battery B1 is lower than the set lower limit, the main control unit sends a high-level signal to the control end of the switch tube Q7, and the switch tube Q7 is turned off, and the battery B1 stops discharging.

[0067] like Figure 2 As shown, this embodiment also includes a power switching module, which includes a voltage regulator U1, a resistor RP2, a transistor Q4 and a relay K1;

[0068] The cathode of the voltage regulator U1 is used to connect to the rectifier, the anode of the voltage regulator U1 is connected to the first end of the resistor RP2, the second end of the resistor RP2 is grounded, the sliding end of the resistor RP2 is connected to the base of the transistor Q4, the collector of the transistor Q4 is connected to the first input end of the relay K1, the emitter of the transistor Q4 is grounded, the second input end of the relay K1 is used to connect to the rectifier, the common end of the relay K1 is used to connect to the inverter, and the normally open end of the relay K1 is connected to the positive electrode of the battery B1.

[0069] The power switching module in this embodiment is a static switch, which is used to control the switching from the power grid to the battery B1. When the power grid is normal, the power grid provides power to the device, and when a problem with the power grid is detected, the power supply is seamlessly switched to the battery B1.

[0070] Specifically, when the power supply of the grid is normal, the DC voltage at the output end of the rectifier is greater than the breakdown voltage of the voltage regulator U1, the voltage regulator U1 breaks down and conducts, a voltage is generated on the resistor RP2, the transistor Q4 is turned on, and the relay K1 is energized and closed, that is, the common end of the relay K1 is connected to the normally open end of the relay K1, and the battery B1 does not work.

[0071] When there is a problem with the power supply of the grid, the DC voltage at the output end of the rectifier is less than the breakdown voltage of the voltage regulator U1, the voltage regulator U1 is cut off, the transistor Q4 is cut off, the relay K1 is not energized, and the common end of the relay K1 is connected to the normally closed end of the relay K1, that is, the battery B1 is connected to the inverter.

[0072] The above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. UPS power supply system, characterized in that: It includes a charging module, a discharging module, a battery detection module, a main control unit and a timing module; The first end of the charging module is used to connect to the rectifier, the second end of the charging module is used to connect to the battery, and the control end of the charging module is connected to the main control unit; The first end of the battery detection module is used to connect to the battery, and the second end of the battery detection module is connected to the main control unit; The first end of the discharge module is used to connect to the battery, and the second end of the discharge module is connected to the main control unit; The timing module is connected to the main control unit.

2. The UPS power supply system according to claim 1, characterized in that: The battery detection module includes a resistor R8 and a resistor R9; The first end of the resistor R8 is connected to the positive electrode of the battery, the negative electrode of the battery is grounded, the second end of the resistor R8 is grounded through the resistor R9, and the second end of the resistor R8 is connected to the main control unit.

3. The UPS power supply system according to claim 2, characterized in that: The charging module includes a switch tube Q1, a transistor Q6, a variable resistor RP1, a voltage regulator tube U3 and an amplifier U4; The first end of the switch tube Q1 is used to connect to the rectifier, and the second end of the switch tube Q1 is connected to the positive electrode of the battery; The collector of the transistor Q6 is connected to the first end of the switch tube Q1, the base of the transistor Q6 is connected to the main control unit, the emitter of the transistor Q6 is connected to the first end of the variable resistor RP1, the sliding end of the variable resistor RP1 is connected to the cathode of the voltage regulator tube U3, the anode of the voltage regulator tube U3 is grounded, the second end of the variable resistor RP1 is connected to the inverting input end of the amplifier U4, the non-inverting input end of the amplifier U4 is connected to the second end of the resistor R8, and the output end of the amplifier U4 is connected to the control end of the switch tube Q1.

4. The UPS power supply system according to claim 3, characterized in that: The charging module also includes a transistor Q5, a controller U2, a resistor R6, a resistor R7, a capacitor C2, a switch tube Q3, a resistor R5 and a resistor R2; The base of the transistor Q5 is connected to the output end of the amplifier U4, the emitter of the amplifier U4 is connected to a 5V power supply, the collector of the transistor Q5 is connected to the power supply end of the controller U2, the power supply end of the controller U2 is connected to the discharge end of the controller through the resistor R6, the discharge end of the controller U2 is connected to the first trigger end of the controller U2 through the resistor R7, the first trigger end of the controller U2 is connected to the second trigger end of the controller U2, the second trigger end of the controller U2 is grounded through the capacitor C2, the output end of the controller U2 is connected to the control end of the switch tube Q3, the first end of the switch tube Q3 is connected to the control end of the switch tube Q1, and the second end of the switch tube Q3 is grounded; The first end of the resistor R5 is connected to the first end of the switch tube Q1 , the second end of the resistor R5 is connected to the control end of the switch tube Q1 , and the second end of the resistor R5 is grounded through the resistor R2 .

5. The UPS power supply system according to claim 3, characterized in that: The charging module also includes a resistor R1, a resistor R3 and a transistor Q2; The first end of the resistor R1 is used to connect to the rectifier, the second end of the resistor R1 is connected to the first end of the switch tube Q1, the second end of the resistor R1 is connected to the base of the transistor Q2 through the resistor R3, the emitter of the transistor Q2 is connected to the first end of the resistor R1, and the collector of the transistor Q2 is grounded.

6. The UPS power supply system according to claim 1, characterized in that: The discharge module includes a resistor R12 and a switch tube Q7; The first end of the resistor R12 is connected to the positive electrode of the battery, the second end of the resistor R12 is connected to the first end of the switch tube Q7, the second end of the switch tube Q7 is grounded, and the control end of the switch tube Q7 is connected to the main control unit.

7. The UPS power supply system according to claim 1, characterized in that: It also includes a power switching module, which includes a voltage regulator U1, a variable resistor RP2, a transistor Q4 and a relay K1; The cathode of the voltage regulator U1 is used to connect to the rectifier, the anode of the voltage regulator U1 is connected to the first end of the variable resistor RP2, the second end of the variable resistor RP2 is grounded, the sliding end of the variable resistor RP2 is connected to the base of the transistor Q4, the collector of the transistor Q4 is connected to the first input end of the relay K1, the emitter of the transistor Q4 is grounded, the second input end of the relay K1 is used to connect to the rectifier, the common end of the relay K1 is used to connect to the inverter, and the normally open end of the relay K1 is connected to the positive electrode of the battery.

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