A UPS intelligent power supply

Abstract

A UPS intelligent power supply comprises a power board, the power board being provided with a DC power supply circuit, a battery power supply circuit, an AC power supply circuit, an auxiliary uninterruptible power supply circuit, and a fault emergency direct circuit. The input of the auxiliary uninterruptible power supply circuit is respectively connected to the DC power supply circuit and the AC power supply circuit, and the output is connected to the power output interface. The fault emergency direct circuit comprises a transfer switch, one end of the normally open contact of the transfer switch is connected to the DC power supply circuit input power interface, and the other end is connected to the power output interface of the UPS intelligent power supply. The present invention uses an AC220V isolation conversion DC24V power supply, a DC24V power supply, a lead-acid battery DC24V power supply, and a large-capacity energy storage capacitor power supply to achieve uninterruptible power supply to a vehicle-mounted DC24V power supply through a parallel diode connection. The vehicle-mounted DC24V power supply is directly connected to the load via a diode, without the need for high-power switching power supply conversion. The vehicle-mounted DC24V power supply has high efficiency and reliability, and is suitable for use with vehicle-mounted or ground-mounted equipment requiring a DC24V uninterruptible power supply.

Description

Technical Field

[0001] The invention belongs to the field of power supplies, and in particular relates to a UPS intelligent power supply. Background Art

[0002] Existing UPS intelligent power supplies use DC voltage regulation, stabilizing the output voltage of the input DC power and battery power through a switching power supply. While this can stabilize the output voltage within a narrow range, the power supply suffers from significant electromagnetic interference, low efficiency, high heat generation, low reliability, difficulty in increasing output power, and high cost. Furthermore, existing UPS intelligent power supplies that output DC power are powered solely by DC power, lacking AC power. Furthermore, because they do not sample the battery charge and discharge currents, they only have the relatively simple battery management features of undervoltage protection and floating charge control. Regarding human-computer interaction, power status is indicated by an LED (light-emitting diode), with no digital tubes to visually display input, output, or charging voltage and current. Summary of the Invention

[0003] In order to solve the above problems, a UPS intelligent power supply is provided.

[0004] The object of the present invention is achieved in the following manner:

[0005] A UPS intelligent power supply includes a power board, on which a DC power supply circuit, a battery power supply circuit, an AC power supply circuit, an auxiliary uninterruptible power supply circuit and a fault emergency direct-through circuit are provided. The input of the DC power supply circuit is connected to an external DC power supply, and the output is connected to the power output interface of the UPS intelligent power supply; the output of the battery power supply circuit is connected to the power output interface of the UPS intelligent power supply; the input of the AC power supply circuit is connected to an external AC power supply and converts the AC power supply into the required DC power supply, and the output is connected to the power output interface of the UPS intelligent power supply; the input of the auxiliary uninterruptible power supply circuit is respectively connected to the DC power supply circuit and the AC power supply circuit, and the output is connected to the power output interface of the UPS intelligent power supply; the fault emergency direct-through circuit includes a conversion switch, and one end of the normally open contact of the conversion switch is connected to the input power interface of the DC power supply circuit, and the other end is connected to the power output interface of the UPS intelligent power supply.

[0006] The DC power supply circuit includes a DC power interface connected to an external input DC power supply. The DC power of the DC power interface passes through the second fuse and the second zero-one diode in sequence and is output through the power output interface of the UPS intelligent power supply.

[0007] The battery power supply circuit includes a battery pack formed by at least one lead-acid battery or at least two lead-acid batteries connected in series, in parallel, or in series and parallel. The lead-acid battery pack passes through a third fuse, a relay, and a 301 diode in sequence, and then outputs power through the power output interface of the UPS intelligent power supply.

[0008] The AC power supply circuit includes an AC power interface connected to an external AC power supply. The AC power interface is connected to a first fuse, an AC EMC filter unit, and an AC / DC isolation power supply unit in sequence, and then connected to the power output interface of the UPS intelligent power supply through a first 01 diode.

[0009] The auxiliary uninterruptible power supply circuit includes an energy storage capacitor power supply, one end of the energy storage capacitor power supply is grounded, and the other end is connected to a current limiting resistor, and then connected to the DC power supply circuit input through a 402 diode and to the AC power supply circuit AC / DC isolation power supply unit output through a 403 diode; at the same time, the other end of the energy storage capacitor power supply is also connected to the power output interface of the UPS intelligent power supply through a 401 diode.

[0010] The energy storage capacitor power supply is a capacitor bank, which is formed by connecting one or at least two capacitors in parallel, in series, or in series-parallel connection according to the output power and voltage of the UPS intelligent power supply. The capacitor bank is used to provide short-term power to the outside from the energy storage capacitor during the switching of the relay contacts, so that the intelligent UPS power supply can achieve zero-time switching between the external DC or AC power supply and the internal battery bank, so that the UPS intelligent power supply can achieve complete uninterrupted power supply.

[0011] The UPS intelligent power supply also includes a battery charging circuit, which includes a DC EMC filter circuit connected to the power output interface of the UPS intelligent power supply, a DC / DC charging power supply unit connected to the DC EMC filter circuit, the output of the DC / DC charging power supply unit connected to the anode of the sixth diode, and the cathode of the sixth diode connected to the battery pack through a third fuse.

[0012] The UPS intelligent power supply also includes an intelligent power management and control circuit unit, which includes a CPU circuit unit. The CPU circuit unit is connected to a USB interface circuit unit, an LED status indication interface circuit unit, a digital display and buzzer circuit interface circuit unit, a communication isolation interface circuit unit, a DC / DC isolation power supply unit, an analog isolation detection circuit unit I, an analog isolation detection circuit unit II, an analog isolation detection circuit unit III, a digital isolation conversion circuit unit, and a temperature ID chip. The DC / DC isolation power supply unit is connected to the UPS intelligent power supply output interface through a DC EMC filter circuit, and the power supply output through the UPS intelligent power supply output interface is then converted into a low-voltage power supply for internal use in the UPS intelligent power supply through voltage isolation.

[0013] The UPS intelligent power supply also includes a power supply switching and battery charge and discharge control circuit unit, the input end of which inputs an external input DC voltage, a DC voltage after the external input AC is converted to DC, and a battery pack voltage. The output of the power supply switching and battery charge and discharge control circuit unit is connected to a relay in the battery power supply circuit and a DC / DC charging power supply unit in the battery charging circuit.

[0014] A method for uninterruptible power supply of a UPS intelligent power supply, the method comprising:

[0015] When the external input DC power supply voltage is lower than the set value or the external input AC power supply voltage is lower than the set value, the normally open contact of the relay of the battery power supply circuit is closed, and the lead-acid battery group in the battery power supply circuit is connected to the power output interface of the UPS intelligent power supply for power supply;

[0016] During the switching process of the normally open contact of the relay from normally open to closed, the energy storage capacitor of the auxiliary uninterruptible power supply circuit is connected to the power output interface of the UPS intelligent power supply through the diode for power supply;

[0017] When the UPS intelligent power supply fails, the normally open contact of the transfer switch is closed, so that the input power interface and the output power interface of the UPS intelligent power supply DC power supply circuit are directly connected.

[0018] Beneficial effects of the present invention:

[0019] This device uses a single AC220V isolated DC24V power source, a DC24V power source, a lead-acid battery DC24V power source, and a large-capacity energy storage capacitor power source connected in parallel via diodes to achieve uninterrupted power supply for the vehicle's DC24V power supply. This power supply is directly connected to the load via the diodes, eliminating the need for high-power switching power conversion. It also features power detection, recording, and RS485 / CAN communication functions, making it suitable for use with on-board or ground-based equipment requiring a DC24V uninterruptible power supply.

[0020] The human-computer interaction functions of the UPS intelligent power supply of the present invention mainly include a digital display function, an LED indication function, a buzzer function, an emergency switching function, a USB dump function, and a lead-acid battery undervoltage buzzer function.

[0021] The human-computer interaction function of the UPS intelligent power supply of the present invention includes a digital display function, which can intuitively display the UPS intelligent power supply input voltage, current, output voltage, current, charging voltage, and current. At the same time, the LED indication function and the buzzer function are used as auxiliary functions to provide more information.

[0022] The UPS intelligent power supply of the present invention is provided with a transfer switch as an emergency transfer switch. When the circuit between the input and output inside the UPS is disconnected due to a fault, this switch can be operated to directly connect the input and output, thereby realizing emergency direct connection of the DC power supply or AC220V mains power into the DC power supply through isolation.

[0023] The UPS intelligent power supply USB dump function of the present invention is to set a USB interface on the front panel of the UPS intelligent power supply, through which UPS record data files can be dumped.

[0024] The UPS intelligent power supply of the present invention can realize true uninterrupted power supply by providing an auxiliary uninterrupted power supply circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention.

[0026] Figure 2 This is the circuit diagram of the AC EMC filter circuit unit and the AC / DC isolation power supply unit.

[0027] Figure 3 This is the circuit diagram of the DC EMC filter circuit unit and the DC / DC isolation power supply unit.

[0028] Figure 4 This is the circuit diagram of the DC / DC charging power supply unit.

[0029] Figure 5 This is the circuit diagram of the input voltage / current analog isolation detection circuit unit.

[0030] Figure 6 This is the circuit diagram of the output voltage / current analog isolation detection circuit unit.

[0031] Figure 7 This is the circuit diagram of the charging voltage / current analog isolation detection circuit unit.

[0032] Figure 8 This is the circuit diagram of the transfer switch state detection circuit unit.

[0033] Figure 9 This is the circuit diagram of the input / output / charge / discharge voltage digital isolation conversion circuit unit and the temperature ID chip.

[0034] Figure 10 This is the circuit diagram of the CUP circuit unit.

[0035] Figure 11 This is the circuit diagram of the communication isolation interface unit.

[0036] Figure 12 This is the circuit diagram of the digital display and buzzer interface circuit unit.

[0037] Figure 13 This is a schematic diagram of the USB interface circuit unit.

[0038] Figure 14 This is a schematic diagram of the power supply switching and battery charging and discharging control circuit unit. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0040] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same technical meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0041] like Figure 1 As shown, the present invention provides a UPS intelligent power supply. The UPS intelligent power supply includes a power board equipped with a DC power supply circuit, an AC power supply circuit, an auxiliary uninterruptible power supply circuit, and a fault emergency direct circuit. The DC power supply circuit is used to connect to an external DC power supply to power a load connected to the UPS intelligent power supply. The external DC power supply charges a battery pack connected to the battery power supply circuit. The battery power supply circuit is used to provide uninterrupted power to the load via the battery pack when the external DC power supply is disconnected or the voltage drops to a preset threshold. In some embodiments, when the present invention is applied on a train, the DC power supply is an onboard 24V DC power supply.

[0042] The DC power supply circuit includes a DC power interface connected to an external DC power supply. The DC power from the DC power interface passes through fuse F2 and diode V201, and is then output from power output interfaces XU3-XU6 of the UPS intelligent power supply to power the loads connected to the UPS intelligent power supply. Diode V201 is used to prevent backflow, reverse polarity, and parallel connection with the power output of other power supply circuits.

[0043] The battery power supply circuit includes a lead-acid battery pack. After passing through fuse F3, relay K1, and diode V301, the battery pack outputs power from power output interfaces XU3-XU6 of the UPS intelligent power supply, supplying power to the loads connected to the UPS intelligent power supply. The batteries in the battery pack can be large-capacity, maintenance-free, valve-regulated lead-acid batteries. Based on the preset battery discharge duration and output voltage, the battery pack can select a single lead-acid battery or at least two or more lead-acid batteries. The at least two lead-acid batteries are connected in series, in parallel, or in series-parallel configuration to form a battery pack housed within the UPS intelligent power supply housing. In some embodiments, the battery pack comprises two 12V, large-capacity, maintenance-free lead-acid batteries connected in series to a total voltage of 24V. The battery pack is charged by an external power supply, which passes through a DC EMC filter circuit unit and a DC / DC charging power supply unit. The external power supply includes an external DC power supply and an external AC power supply.

[0044] In one or more feasible implementations, the UPS intelligent power supply further includes an AC power supply circuit; the AC power supply circuit is used to connect to an external AC220V AC power supply and convert the AC power supply into the required DC power supply to power the load. Figure 1 In the embodiment shown, the AC power supply circuit includes an AC power interface connected to an external AC power source. The AC power interface is connected to a first fuse F1, a filter circuit unit, and an AC / DC isolation power supply unit in sequence, and then connected to the power output interface of the UPS intelligent power supply through a first zero-one diode V101.

[0045] like Figure 2As shown, the aforementioned filter circuit unit can be an AC EMC filter circuit unit. The AC EMC filter circuit unit includes a first common-mode filter L101 connected to the AC power source, a first common-mode filter L102 connected to the first common-mode filter L101, and a filter capacitor connected to the common-mode inductor. These filters the input AC power before outputting it through an AC / DC isolated power supply unit. This AC / DC isolated power supply unit is an AC / DC power supply module capable of converting a 220V AC voltage into the required DC voltage for output. After passing through a first diode V101, the output voltage is output from power output interfaces XU3-XU6 of the UPS intelligent power supply, supplying power to the load connected to the UPS intelligent power supply. Preferably, the AC / DC isolated power supply module in the AC / DC isolated power supply unit utilizes LH60-20B24.

[0046] In one or more feasible embodiments, the UPS intelligent power supply also includes an auxiliary uninterruptible power supply circuit. Since there will be a time interval when the relay switches when the power supply is converted from an external DC power supply or AC power supply to a battery power supply, and the power outage will occur during this time interval, the present invention provides an auxiliary uninterruptible power supply circuit, the circuit composition of which is used to ensure that when the external power supply is converted to battery power or when the battery power is converted to the external power supply, the power supply during the switching process from DC power supply or AC power supply to battery power supply and the power supply during the switching process from battery power supply to DC power supply or AC power supply is completely uninterrupted.

[0047] The auxiliary uninterruptible power supply circuit includes an energy storage capacitor power supply C401, one end of which is grounded, and the other end is connected to a current limiting resistor R401. The other end is connected to the DC power supply circuit input through a 402 diode V402 and to the AC power supply circuit AC / DC isolation power supply unit output through a 403 diode V403 to charge the energy storage capacitor C401. The other end of the energy storage capacitor power supply C401 is connected to the power output interface of the UPS intelligent power supply through a 401 diode V401 to provide short-term power to the external load when the DC power supply voltage input by the DC power supply interface falls below a preset voltage threshold or when the power is cut off. The above-mentioned resistor R401 is set to prevent the energy storage capacitor from charging excessively when the UPS intelligent power supply is powered on, thereby preventing the UPS intelligent power supply from having excessive startup current due to excessive charging current.

[0048] In one or more feasible embodiments, the above-mentioned energy storage capacitor power supply can select an existing capacitor group, such as a large-capacity electrolytic capacitor or a supercapacitor. The capacitor group is formed by setting a capacitor or at least two capacitors in the UPS smart power supply in parallel, series, or series-parallel according to the output power and voltage of the UPS smart power supply.

[0049] When the power supply of the UPS intelligent power supply switches from the external DC power supply circuit or AC power supply circuit to the battery power supply circuit, the power stored in the storage capacitor power supply C401 passes through the 401st diode V401 and is output from the power output interface of the UPS intelligent power supply to supply power. Figure 1 As shown, in one or more feasible embodiments, the UPS intelligent power supply further includes a fault emergency direct circuit formed by a transfer switch. One end of the normally open contact of the transfer switch is connected to the DC power supply circuit input power interface, and the other end of the normally open contact is connected between the UPS intelligent power supply output power interfaces. If fuses F1, F2, the first and second diodes V101, V201 are open, or the internal circuitry of the power supply is disconnected, power input may be present but power output may be absent. In this case, the isolation switch can directly connect the DC power input and output of the UPS intelligent power supply, achieving fault isolation while maintaining power to the device.

[0050] The fault emergency direct circuit includes a transfer switch, one end of the normally open contact of the transfer switch is connected to the DC power supply circuit input power interface, and the other end is connected to the UPS intelligent power supply output power interface.

[0051] The UPS intelligent power supply also includes a battery charging circuit, which includes a DC EMC filter circuit connected to the power output interface, a DC / DC charging power supply unit connected to the DC EMC filter circuit, the output of the DC / DC charging power supply unit connected to the anode of the sixth diode, and the cathode of the sixth diode connected to the battery pack through a third fuse.

[0052] like Figure 1As shown, the UPS intelligent power supply also includes a power supply switching and battery charge and discharge control circuit unit, the output end of which is respectively connected to the DC / DC charging power supply unit of the charging circuit and the relay of the battery power supply circuit; the battery sets a voltage switching threshold and detects the external input DC input voltage, the DC voltage after AC-DC conversion, and the battery pack voltage. When the external input DC power supply or the DC voltage after AC-DC conversion is lower than the voltage switching threshold or power is off, the DC / DC charging power supply unit of the battery charging circuit is controlled to stop working, the normally open contact of the relay K1 of the battery power supply circuit is closed, and power is supplied through the battery module of the battery power supply circuit to the power output interface XU3~XU6 of the UPS intelligent power supply.

[0053] like Figure 4 As shown, the DC / DC charging power supply unit uses the sixth charging isolation power supply module U601 to charge the battery. Figure 1 、 Figure 2 After the AC EMC filter circuit unit and AC / DC isolation power supply unit shown in the figure are converted into DC output, they are fed into Figure 3 The DC EMC filter circuit unit shown in the figure filters the Figure 4 The DC / DC charging power supply unit shown; Figure 1 As shown, after the DC power supply is output, it is also sent to Figure 3 The DC EMC filter circuit unit shown in the figure filters the Figure 4 The DC / DC charging power supply unit shown. Figure 4 The DC / DC charging power supply unit 601 charging isolation power supply module U601 converts the filtered input power into the charging power required by the battery pack, and then Figure 4 The circuit composed of the sixth common-mode inductor L601 and the capacitor connected to the common-mode inductor is filtered, and the final output is used to charge the battery pack.

[0054] like Figure 14 As shown, the power supply switching and battery charge and discharge control circuit unit includes a first operational amplifier U620A and a second operational amplifier U620B. When the input voltage (DC input voltage and the voltage after AC-DC conversion) is input to the reverse input terminal of U620A after resistor division, when the input voltage is lower than the reference voltage of the positive input terminal of the first operational amplifier U620A, the output terminal of the first operational amplifier outputs a high level, and this level is sent out in two ways.

[0055] 1. The collector-emitter stage of the 601st transistor Q601 is turned on, and the current flows through the diode at the input end of the 630th optocoupler U630, driving the collector-emitter stage at the output end of the 630th optocoupler U630 to turn on and send out a low-level control signal CTRL2. Figure 4 The charging isolation power module U601 in the power supply stops working, no longer outputs charging voltage and charging current, and stops charging the battery pack.

[0056] Another circuit controls the collector-emitter conduction of transistor Q610, sending out a low-level control signal TQ, which is connected to one end of the coil of relay K1 (the other end of the coil is connected to the output voltage). That is, current flows through the coil of relay K1, the contacts of relay K1 are energized, and the UPS intelligent power supply switches to discharging the internal battery pack.

[0057] The inverting input terminal of the second operational amplifier U620B is connected to a switch circuit for switching the battery pack voltage Vin3'+. The switch circuit includes a sixth transistor Q605 and a sixth transistor Q604 and their peripheral circuits. Figure 14 J102 is the socket connected to the AC input selection switch on the UPS intelligent power supply chassis. When the UOS intelligent power supply selects AC input, the AC input selection switch contacts close, the output voltage (VOUT1) passes through the switch contacts, and then drives the sixth transistor Q605 through the sixth resistor R640. The collector-emitter of the sixth transistor Q605 is short-circuited, which in turn drives the emitter-collector of the sixth transistor Q604 to short-circuit, causing the battery voltage (VIN3'+) to be transmitted to the reverse input terminal of the second operational amplifier U602B. It is compared with the reference voltage at the positive input terminal of the second operational amplifier U602B. If the reverse input voltage is lower than the positive input voltage, it indicates that the battery pack voltage is undervoltage, and the second operational amplifier U602B is undervoltage. The output is high, driving the collector-emitter of the 603rd transistor Q603 to short-circuit, pulling down the output of the first operational amplifier U602A to a low level, disconnecting the contacts of the relay K1, and stopping the battery from discharging; when the AC input selection switch connected to J102 is disconnected, it will still pull down the output of the first operational amplifier U602A to a low level, disconnecting the contacts of the relay K1, and stopping the battery from discharging; if the voltage of this reverse input terminal is higher than the voltage of the forward input terminal, the second operational amplifier U602B outputs a low level, and the collector-emitter of the 603rd transistor Q603 is open, and does not interfere with the first operational amplifier U620A's comparison of the external voltage and the switching action of the relay K1.

[0058] When the AC input selection switch is disconnected, but there is a DC power input (in-vehicle application), the DC input power signal VIN2'+ drives the sixth transistor Q605 through the sixth resistor R653, and the collector-emitter of the sixth transistor Q650 is turned on and short-circuited, and then drives the emitter-collector of the sixth transistor Q604 to be turned on and short-circuited, so that the battery voltage (VIN3'+) is transmitted to the reverse input terminal of the second operational amplifier U602B, and compared with the reference voltage of the positive input terminal of the second operational amplifier U602B. If the voltage of this reverse input terminal is lower than the voltage of the positive input terminal, it means that the battery pack voltage is undervoltage. The second operational amplifier U602B outputs a high level, driving the collector-emitter of the sixth and third transistor Q603 to short-circuit, pulling down the output of the first operational amplifier U602A to a low level, disconnecting the contacts of the relay K1, stopping the battery discharge, and shutting down the UPS intelligent power supply. However, there will still be DC input power output through the UPS intelligent power supply; if the voltage of this reverse input terminal is higher than the voltage of the forward input terminal, the second operational amplifier U602B outputs a low level, and the collector-emitter of the sixth and third transistor Q603 is open, which does not interfere with the first operational amplifier U620A's comparison of the external voltage and the switching action of the relay K1.

[0059] like Figure 1 As shown, the UPS intelligent power supply also includes a transfer switch state detection circuit unit, such as Figure 8 As shown, the transfer switch state detection circuit unit includes an optocoupler diode detection input portion connected to the transfer switch contacts and an optocoupler transistor detection result output portion. When the transfer switch contacts are closed, current flows through the three optocoupler diodes. Among them, the collector and emitter of the output transistor of the seventh optocoupler U710 are conductive, sending a low-level ZHKG signal to the CPU circuit unit, informing the CPU circuit unit that the transfer switch is in the direct-through state; at the same time, the collector and emitter of the output transistor of the seventh optocoupler U711 are also conductive, driving the collector and emitter of the fifth optocoupler Q511 to conduct, and then driving the collector and emitter of the output transistor of the fifth optocoupler U511 to conduct, sending a low-level CTRL2 Signal, controls the charging isolation power supply module U601 in the DC / DC charging power supply unit to stop working, no longer outputs charging voltage and charging current, and stops charging the battery pack; at the same time, the collector and emitter of the output transistor of the 712th optocoupler U712 are also turned on, driving the collector and emitter of the 510th transistor Q510 to be turned on, and sending a low-level JDQkz signal to the power supply switching and battery charging and discharging control circuit unit, thereby controlling the normally open contact of the relay K1 of the battery power supply circuit to be disconnected, to prevent the battery pack from discharging externally.

[0060] In one or more feasible embodiments, the UPS intelligent power supply of the present invention may include a chassis, wherein the chassis includes but is not limited to a large-capacity lead-acid battery pack, a power board, and a UPS monitoring and recording indicator board, and the batteries or circuit boards are connected by cables. The battery pack in the battery power supply circuit is separately arranged inside the chassis, and the DC power supply circuit, AC power supply circuit, battery power supply circuit and other parts are arranged on the power board (such as Figure 1 As shown); high-current wiring terminals for power input and output of each power supply circuit are set on the edge of the power board, and a high-current aviation connector is set on the rear panel of the chassis. The high-current wiring terminals set on the edge of the power board and the high-current aviation connector set on the rear panel of the chassis are connected by cables. The external DC power supply, AC power supply, and load are all connected to the high-current aviation connector set on the rear panel of the chassis.

[0061] The UPS intelligent power supply also includes a UPS monitoring and recording indicator board, which is provided with an intelligent power management and control circuit unit. The intelligent power management and control circuit unit includes a CPU circuit unit. The CPU circuit unit is connected to a USB interface circuit unit, an LED status indication interface circuit unit, a digital display and buzzer circuit interface circuit unit, a communication isolation interface circuit unit, a DC / DC isolation power supply unit, an analog isolation detection circuit unit I, an analog isolation detection circuit unit II, an analog isolation detection circuit unit III, a digital isolation conversion circuit unit, and a temperature ID chip. The DC / DC isolation power supply unit is connected to the UPS intelligent power supply output interface through a DC EMC filter circuit, and the power supply output through the UPS intelligent power supply output interface is then converted into a low-voltage power supply for internal use in the UPS intelligent power supply through voltage isolation.

[0062] The above-mentioned DC / DC isolated power supply unit is used to connect to the power output interface through the DC EMC filter circuit. The power output through the power output interface supplies power to the processor unit on the UPS monitoring and recording indicator board and other circuit units that require power isolation and voltage conversion.

[0063] Furthermore, the circuit diagram of the DC EMC filter circuit unit and the DC / DC isolation power supply unit is as follows: Figure 3 As shown, the external DC power supply performs common-mode filtering on the current through the fifth common-mode filter L501 and the fifth common-mode filter L502 connected in series in the DC EMC filter circuit unit, and then filters out the series-mode interference through the line capacitor CX503 and the fifth common-mode capacitor before being output through the DC / DC isolation power supply module unit. The output of the DC / DC isolation power supply module unit performs common-mode filtering on the current through the fifth common-mode filter L504 before being output to the CPU circuit unit; the DC / DC isolation power supply module adopts VRB2405LD-20WHR2.

[0064] Among them, the CUP circuit unit and USB interface circuit unit, LED status indication interface circuit unit, digital display and buzzer circuit interface circuit unit, and communication isolation interface circuit unit are arranged on the UPS monitoring record indicator board (such as Figure 1 The DC / DC isolated power supply unit, analog isolation detection circuit unit I, analog isolation detection circuit unit II, analog isolation detection circuit unit III, digital isolation conversion circuit unit, and a temperature ID chip that detects the internal temperature of the UPS intelligent power supply and the device number are installed on the UPS power board.

[0065] However, it should be understood that the above structure does not limit the number and circuit distribution of the circuit boards within the UPS intelligent power supply of this application. In other embodiments of this application, the number of circuit boards within the UPS intelligent power supply may be greater or lesser, and the circuit distribution on each circuit board may be achieved through certain combinations and splits. Furthermore, the UPS intelligent power supply's large-capacity, maintenance-free lead-acid battery pack may also be separately installed outside the UPS intelligent power supply and connected to the UPS intelligent power supply via an interface to expand the battery pack capacity and provide a longer backup power supply.

[0066] Likewise, the aforementioned CUP circuit unit may include but is not limited to existing CPU processors, DSP processors, PLC processors, etc. as needed. Different processors may be independent processors or integrated into one or more processors.

[0067] The USB interface circuit unit serves as a USB interface to connect to an external device with a USB interface, and can be used to dump data of the UPS intelligent power supply or update the UPS intelligent power supply program.

[0068] The communication interface circuit unit is used to communicate with the outside, and the interface unit includes but is not limited to a CAN communication isolation interface and an RS422 communication isolation interface.

[0069] The circuit units used for human-computer interaction include but are not limited to an LED status indication interface circuit unit connected to the CUP circuit unit, a digital display and buzzer circuit interface circuit unit, wherein the LED status indication interface circuit unit includes but is not limited to multiple LED indicator lights. Except for the indicator light for indicating CPU operation, the indicator light for indicating CAN communication and RS422 communication, and the indicator light for indicating record data dump, which are soft lights, the others are hard lights, do not require CPU driving, and have high reliability.

[0070] Based on the information obtained by the CPU circuit unit, different indicators among the multiple indicators are used to indicate one or more of the following:

[0071] 1) The LED indicator light indicates the status of the two power supply voltages (DC power supply and AC power supply) in real time. Usually, the LED indicator light is on when there is voltage, and off when there is no voltage.

[0072] 2) The LED indicator light indicates the status of output voltage in real time. The LED indicator light can be designed to indicate that there is voltage output at present, and to indicate that there is no voltage output at present when the LED indicator light is off.

[0073] 3) The LED indicator light indicates the status of charging voltage in real time. The LED indicator light can be designed to be on to indicate that it is currently charging, and off to indicate that it is not currently charging.

[0074] 4) The LED indicator light indicates the position status of the transfer switch in real time. The LED indicator light can be designed to be off to indicate that the current transfer switch is not directly connected to the UPS power input and output, and to be on to indicate that the current transfer switch is directly connected to the UPS power input and output.

[0075] 5) The LED indicator light indicates the working status of the CPU circuit in real time. The LED indicator light can be designed to flash to indicate that the current processor unit is working, and to be off to indicate that the current processor unit is not working.

[0076] 6) The LED indicator light indicates the USB log file dump status. The LED indicator light can be designed to flash quickly or continuously to indicate that the current USB interface is working, and to be off to indicate that the current USB interface is not working.

[0077] 7) The LED indicator light indicates the CAN or RS422 communication status. The LED indicator light can be designed to flash quickly or continuously to indicate that it is currently communicating with the external device. If it is off, it means that there is no communication with the external device.

[0078] The above-mentioned display unit can include various existing display units, such as liquid crystal display units and digital tube display units. As shown in the figure, in this application, according to the data obtained by the CPU circuit unit, multiple digital tube display interface circuit units are used to display different contents, and each digital tube display interface circuit unit is composed of multiple digital tubes.

[0079] The above-mentioned digital tube display interface circuit unit can be designed as an input voltage digital tube for displaying the input voltage, an output voltage digital tube for displaying the output voltage, a charging voltage digital tube for displaying the charging voltage, an input current digital tube for displaying the input current, an output current digital tube for displaying the output current, and a charging current digital tube for displaying the charging current.

[0080] When used on trains:

[0081] 1) Input voltage digital tube: When only the vehicle DC24V input is available, it indicates the vehicle DC24V voltage in real time; when only the AC220V mains power is available, it indicates the voltage converted from AC220V to DC24V in real time; when two input voltages are input simultaneously, it indicates the higher DC24V voltage of the two; when the battery pack is discharging, it indicates the battery pack terminal voltage.

[0082] 2) Input current digital tube: When only the vehicle DC24V input is available, it indicates the input current of the vehicle DC24V power supply in real time; when only the AC220V mains power is available, it indicates the current of the AC220V converted to DC24V in real time; when two input voltages are input simultaneously, it indicates the current of the higher DC24V voltage; when the battery pack is discharging, it indicates the battery pack discharge current.

[0083] 3) Output voltage digital tube: used to display the voltage value at the power output interface, that is, Figure 1 The values ​​of the four output voltages shown are (the four output voltages are connected in parallel and have the same voltage).

[0084] 4) Output current digital tube: used to display the total output current value of the four power output interfaces.

[0085] 5) Charging voltage digital tube: used to display the charging voltage value of the lead-acid battery pack.

[0086] 6) Charging current digital tube: used to display the charging current value of the lead-acid battery pack.

[0087] The CPU circuit unit of the present invention can also be connected to a buzzer. When the power is supplied by a battery, the buzzer reminds the staff to pay attention to the battery power level.

[0088] Analog Isolation Detection Circuit Units I, II, and III are used to detect input voltage / current values ​​(including DC input voltage / current, AC / DC input voltage / current, and battery input voltage / current), output voltage / current values, and charging voltage / current values. The detected analog values ​​are then converted into digital signals and sent to the CPU circuit unit for recording. Simultaneously, the CPU circuit unit drives the digital display and buzzer circuit interface circuit units to display or sound an alarm.

[0089] Furthermore, analog isolation detection circuit unit I, analog isolation detection circuit unit II, and analog isolation detection circuit unit III have the same structure, each including a power supply monitor LTC2945IMS#TRPBF and a digital isolator ADuM2250ARWZ. The power supply monitor LTC2945IMS#TRPBF is used to detect input voltage / current values, output voltage / current values, and charging voltage / current values, converting the detected analog values ​​into digital signals and sending them to the CPU circuit unit for recording. Furthermore, the circuit diagram of the input voltage / current analog isolation detection circuit unit (circuit diagram of analog isolation detection circuit unit I) is shown below. Figure 5 shown.

[0090] Output voltage / current analog isolation detection circuit unit circuit diagram (analog isolation detection circuit unit II) Figure 6 shown.

[0091] The circuit diagram of the charging voltage / current analog isolation detection circuit unit (analog isolation detection circuit unit III) is as follows Figure 7 shown.

[0092] like Figure 1 As shown, the power supply switching and battery charge-discharge control circuit unit also controls the battery pack's response to the DC / DC charging power supply unit, implementing battery discharge undervoltage protection and battery overcharge protection. Furthermore, the power supply switching and battery charge-discharge control circuit unit is connected to the CPU circuit unit via the digital isolation conversion circuit unit. It receives instructions from the CPU circuit unit and further controls the charging of the DC / DC charging power supply unit, enabling intermittent charging to prevent the battery pack's life from being shortened due to long-term floating charging.

[0093] The transfer switch status detection circuit unit is connected to the transfer switch and is used to detect the open / closed state of the transfer switch and transmit the information to the CPU circuit unit and the LED status indication interface circuit unit via the digital isolation conversion circuit unit. The CPU circuit unit records the transfer switch status, and the LED status indication interface circuit unit displays the transfer switch status via an LED. The transfer switch status detected by the transfer switch status detection circuit unit is also transmitted to the power supply switching and battery charge / discharge control circuit unit. If the transfer switch is detected to be in the direct-through state, the power supply switching and battery charge / discharge control circuit unit disables the charging function of the DC / DC charging power supply unit to prevent the battery pack from being in a state of both charging and discharging during discharge.

[0094] The circuit diagram of the digital isolation conversion circuit unit is as follows: Figure 9 As shown, the digital isolation conversion circuit uses the optocoupler isolation ACPL-217-500E. The temperature ID chip uses the MAX31826MUA.

[0095] The present invention can obtain and record the operating status of the UPS intelligent power supply through the above-mentioned units, and perform human-computer interaction by displaying, indicating, beeping, etc. on each human-computer interaction unit.

[0096] Based on the above-mentioned UPS intelligent power supply, the present invention further provides an uninterruptible power supply method using the above-mentioned UPS intelligent power supply, the method comprising:

[0097] The power supply switching and battery charge and discharge control circuit unit sets the voltage switching threshold and detects the external input DC voltage, the DC voltage after AC to DC conversion, and the battery pack voltage. When the external input DC power supply or the DC voltage after AC to DC conversion is lower than the voltage switching threshold or the power is cut off, the normally open contact of the relay K1 of the battery power supply circuit is closed, and the battery module of the battery power supply circuit is connected to the power output interface of the UPS intelligent power supply for power supply.

[0098] During the process of the normally open contact of the relay K1 switching from normally open to closed, power is supplied by the energy storage capacitor power supply of the auxiliary uninterruptible power supply circuit, thereby avoiding the load voltage being too low or the power being cut off momentarily during the relay switching, thereby realizing the complete uninterruptible power supply function of the UPS intelligent power supply.

[0099] The power supply switching and battery charge and discharge control circuit unit monitors the voltage of the battery pack in real time. When the battery pack supplies power to the load, when the voltage of the battery pack is lower than the battery undervoltage protection value set by the power supply switching and battery charge and discharge control circuit unit, the normally open contact of relay K1 on the power channel of the lead-acid battery pack is disconnected, and the battery pack power supply stops discharging to the load, thereby preventing the lead-acid battery from over-discharging.

[0100] The UPS intelligent power supply's internal DC / DC charging power supply unit charges the battery pack. This unit has a float charge function to prevent overcharging of the lead-acid battery. Simultaneously, the power supply switching and battery charge and discharge control circuit unit controls whether the DC / DC charging power supply unit is charging or not, preventing overcharging or prolonged float charging of the battery pack.

[0101] The UPS intelligent power supply of the present invention also has detection and recording functions. The UPS intelligent power supply is arranged with a CPU circuit unit as the core and multiple detection circuit units connected thereto. It can detect the UPS power supply input voltage, current, output voltage, current, charging voltage, current, internal temperature, device number (ID number), the status of DC or AC input voltage, the status of output voltage, the status of charging voltage, and the position status of the conversion switch. At the same time, these data are recorded regularly to form a record file, which can be dumped through the USB interface circuit.

[0102] The UPS intelligent power supply of the present invention also has an external isolated communication function. The R422 / CAN communication isolation interface circuit unit can transmit UPS intelligent power supply detection information to external power-consuming devices in real time, facilitating the power management of the external power-consuming devices themselves and remote control of the UPS intelligent power supply.

[0103] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without any creative work are still within the scope of protection of the present invention.

Claims

1. A UPS intelligent power supply, including a power board, characterized by: The power board is provided with a DC power supply circuit, a battery power supply circuit, an AC power supply circuit, an auxiliary uninterruptible power supply circuit and a fault emergency direct circuit. The input of the DC power supply circuit is connected to an external DC power supply, and the output is connected to the power output interface of the UPS intelligent power supply; the output of the battery power supply circuit is connected to the power output interface of the UPS intelligent power supply; the input of the AC power supply circuit is connected to an external AC power supply and converts the AC power supply into the required DC power supply, and the output is connected to the power output interface of the UPS intelligent power supply; the input of the auxiliary uninterruptible power supply circuit is respectively connected to the DC power supply circuit and the AC power supply circuit, and the output is connected to the power output interface of the UPS intelligent power supply; the fault emergency direct circuit includes a conversion switch, and one end of the normally open contact of the conversion switch is connected to the DC power supply circuit input power interface, and the other end is connected to the power output interface of the UPS intelligent power supply; The auxiliary uninterruptible power supply circuit includes an energy storage capacitor power supply (C401), one end of the energy storage capacitor power supply (C401) is grounded, and the other end is connected to a current limiting resistor (R401), and then connected to the input of a DC power supply circuit through a 402 diode (V402), and to the output of an AC power supply circuit AC / DC isolation power supply unit through a 403 diode (V403); at the same time, the other end of the energy storage capacitor power supply (C401) is also connected to the power output interface of the UPS intelligent power supply through a 401 diode (V401).

2. The UPS intelligent power supply according to claim 1, characterized in that: The DC power supply circuit includes a DC power interface connected to an external input DC power supply. The DC power of the DC power interface passes through a second fuse (F2) and a second zero-one diode (V201) in sequence and is output through a power output interface of the UPS intelligent power supply.

3. The UPS intelligent power supply according to claim 1, characterized in that: The battery power supply circuit includes a battery pack formed by at least one lead-acid battery or at least two lead-acid batteries connected in series, in parallel, or in series and parallel. The lead-acid battery pack sequentially passes through a third fuse (F3), a relay (K1), and a 301st diode (V301), and then outputs power through a power output interface of a UPS intelligent power supply.

4. The UPS intelligent power supply according to claim 1, characterized in that: The AC power supply circuit includes an AC power interface connected to an external AC power source, wherein the AC power interface is connected in sequence to a first fuse (F1), an AC EMC filter unit, and an AC / DC isolation power supply unit, and then connected to a power output interface of a UPS intelligent power supply through a first zero-one diode (V101).

5. The UPS intelligent power supply according to claim 4, characterized in that: The energy storage capacitor power supply (C401) is a capacitor bank, which is formed by connecting one capacitor or at least two capacitors in parallel, in series, or in series-parallel connection according to the output power and voltage of the UPS intelligent power supply. The capacitor bank is used to provide a short-term power supply to the outside from the energy storage capacitor (C401) during the switching of the relay (K1) contacts, so that the intelligent UPS power supply can achieve zero-time switching between the external DC or AC power supply and the internal battery bank, so that the UPS intelligent power supply can achieve complete uninterrupted power supply.

6. The UPS intelligent power supply according to claim 1, characterized in that: The UPS intelligent power supply also includes a battery charging circuit, which includes a DC EMC filter circuit connected to the power output interface of the UPS intelligent power supply, a DC / DC charging power supply unit connected to the DC EMC filter circuit, the output of the DC / DC charging power supply unit connected to the anode of the sixth diode, and the cathode of the sixth diode connected to the battery pack through a third fuse.

7. The UPS intelligent power supply according to claim 1, characterized in that: The UPS intelligent power supply also includes an intelligent power management and control circuit unit, which includes a CPU circuit unit. The CPU circuit unit is connected to a USB interface circuit unit, an LED status indication interface circuit unit, a digital display and buzzer circuit interface circuit unit, a communication isolation interface circuit unit, a DC / DC isolation power supply unit, an analog isolation detection circuit unit I, an analog isolation detection circuit unit II, an analog isolation detection circuit unit III, a digital isolation conversion circuit unit, and a temperature ID chip. The DC / DC isolation power supply unit is connected to the UPS intelligent power supply output interface through a DC EMC filter circuit, and the power supply output through the UPS intelligent power supply output interface is then converted into a low-voltage power supply for internal use in the UPS intelligent power supply through voltage isolation.

8. The UPS intelligent power supply according to claim 6, characterized in that: The UPS intelligent power supply also includes a power supply switching and battery charge and discharge control circuit unit, the input end of which inputs an external input DC voltage, a DC voltage after external input AC is converted to DC, and a battery pack voltage, and the output of the power supply switching and battery charge and discharge control circuit unit is connected to a relay (K1) in a battery power supply circuit and a DC / DC charging power supply unit in a battery charging circuit.

9. An uninterruptible power supply method using the UPS intelligent power supply according to any one of claims 1 to 8, characterized in that: The uninterruptible power supply method comprises: When the external input DC power supply voltage is lower than the set value or the external input AC power supply voltage is lower than the set value, the normally open contact of the relay (K1) of the battery power supply circuit is closed, and the lead-acid battery pack in the battery power supply circuit is connected to the power output interface of the UPS intelligent power supply for power supply; During the switching process of the normally open contact of the relay (K1) from normally open to closed, the energy storage capacitor of the auxiliary uninterruptible power supply circuit is connected to the power output interface of the UPS intelligent power supply through the 401st diode (V401) for power supply; When the UPS intelligent power supply fails, the normally open contact of the transfer switch is closed, so that the input power interface and the output power interface of the UPS intelligent power supply DC power supply circuit are directly connected.

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