An on-line UPS device with redundant AC input modules

Abstract

The utility model belongs to the UPS power supply technical field, especially relates to an online UPS device with redundant AC input module, including the cabinet body and the circuit in the cabinet body, single-chip microcomputer connects inverting output circuit, commercial power detection circuit and buzzer control circuit respectively, redundant AC input module connects voltage transformation rectifier circuit and power factor correction circuit in proper order, power factor correction circuit connects inverting output circuit and charging circuit respectively, charging circuit connects standby power supply and maintenance -free battery group, and commercial power detection circuit still connects voltage transformation rectifier circuit, be equipped with single -pole double -throw magnetic latching relay in redundant AC input module. The utility model has the beneficial effects that: through the relay of AC220V double power supply supply circuit, automatic switching is carried out, and when the extreme situation of the double AC power supply all power off appears, the safety and stability of the user with extremely high power supply requirement can still be satisfied.

Description

Technical Field

[0001] This utility model belongs to the field of UPS power supply technology, and specifically relates to an online UPS device with a redundant AC input module. Background Technology

[0002] A UPS (Uninterruptible Power Supply) is a type of uninterruptible power supply containing energy storage devices. It is primarily used to provide uninterrupted power to equipment with high power stability requirements. An online UPS means that regardless of whether the mains voltage is normal or not, the AC voltage supplied to the load always passes through the inverter output circuit, and the inverter is always operational. Therefore, when a power outage occurs, the UPS can immediately convert the stored electrical energy into AC power through the inverter to supply power to the load, thus achieving the goal of zero-interruption switching of output voltage. Online UPSs generally have a double-conversion structure. Double conversion means that during normal operation, the electrical energy undergoes two conversions—AC / DC and DC / AC—before being supplied to the load.

[0003] Chinese utility model patent application number 201320832635.9 discloses an online UPS dual-power automatic switching device, which includes two parallel power supplies. By switching between the two power supplies, the mains power supply to the UPS is ensured to be uninterrupted. When one power supply fails, the other power supply automatically switches on, thus ensuring continuous power supply and keeping the UPS in a stable voltage supply state. Normally, only regular charging and discharging maintenance of the batteries is required, improving battery efficiency and lifespan, and reducing maintenance costs. Its shortcomings include the use of two sets of contactors for interlocking switching, a large number of contactors, and the lack of a parallel RC snubber circuit across the contactor coils, making it prone to failure. Utility Model Content

[0004] The purpose of this invention is to provide an online UPS device with a redundant AC input module, overcoming the shortcomings of the prior art. By using a single-pole double-throw magnetic latching relay for automatic and reliable switching of the dual AC power supply circuits, the battery can reliably switch in and continue to provide power in the extreme case of a power outage of both power sources. This satisfies the safety and stability requirements of users with extremely high power supply demands and avoids economic losses or loss of life and property caused by unexpected power outages.

[0005] To achieve the above objectives, this utility model employs the following technical solution: An online UPS device with a redundant AC input module includes a cabinet and circuitry housed within the cabinet. The circuitry includes a redundant AC input module, a transformer-rectifier circuit, a microcontroller, a power factor correction circuit, a charging circuit, a backup power supply, an inverter output circuit, a mains power detection circuit, and a buzzer control circuit. The microcontroller is connected to the inverter output circuit, the mains power detection circuit, and the buzzer control circuit. The redundant AC input module is sequentially connected to the transformer-rectifier circuit and the power factor correction circuit. The power factor correction circuit is connected to the inverter output circuit and the charging circuit. The charging circuit is connected to the backup power supply and a maintenance-free battery pack. The mains power detection circuit is also connected to the transformer-rectifier circuit. The redundant AC input module includes a single-pole double-throw magnetic latching relay, and the coil of the single-pole double-throw magnetic latching relay is equipped with an RC snubber circuit.

[0006] Furthermore, the microcontroller's chip model is AT89C2051.

[0007] Furthermore, the chips in the transformer rectifier circuit are LM7812 and LM7805.

[0008] Furthermore, the chip model of the power factor correction circuit is UCC28019AD.

[0009] Furthermore, the chip model of the inverter output circuit is PUCC27301AQDDARQ.

[0010] Furthermore, the backup power supply chip model is URD_LD-20WR3, and the charging circuit chip model is LTC4079EDD#PBF.

[0011] Furthermore, the chip model of the mains power detection circuit is 78L05.

[0012] Compared with the prior art, the beneficial effects of this utility model are: The redundant AC input module uses a single-pole double-throw magnetic latching relay for automatic and reliable switching. In the extreme case of a power outage of both AC power sources, the battery can reliably connect to provide power, thereby meeting the safety and stability requirements of users with extremely high power supply requirements and avoiding economic losses or loss of life and property caused by unexpected power outages. The two AC220V mains power supplies share a single transformer and voltage regulator circuit, which greatly reduces the size of the equipment, simplifies the structure, lowers the cost, and provides ample space for the product to be equipped with a larger capacity battery. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the external structure of an embodiment of this utility model; Figure 2 This is a schematic diagram of the redundant AC input module according to an embodiment of this utility model; Figure 3 This is a schematic diagram of the transformer-rectifier circuit according to an embodiment of this utility model; Figure 4 This is a schematic diagram of the microcontroller circuit principle of an embodiment of this utility model; Figure 5 This is a schematic diagram of the power factor correction circuit according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the circuit principle of the backup power supply and maintenance-free battery pack according to an embodiment of this utility model; Figure 7 This is a schematic diagram of the charging circuit principle of an embodiment of this utility model; Figure 8 This is a schematic diagram of the inverter output circuit according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the mains power detection circuit according to an embodiment of this utility model; Figure 10 This is a schematic diagram of the buzzer control circuit according to an embodiment of the present invention. Detailed Implementation

[0014] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the specific embodiments used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some embodiments of this utility model. For those skilled in the art, other specific embodiments can be obtained based on these specific embodiments without creative effort.

[0016] The components of the present invention described and shown in the specific embodiments herein can be arranged and designed in numerous different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0017] See Figure 1-10This is a schematic diagram of an embodiment of an online UPS device with a redundant AC input module according to this utility model. It includes a cabinet and circuitry housed within the cabinet. The circuitry includes a redundant AC input module, a transformer-rectifier circuit, a microcontroller, a power factor correction circuit, a charging circuit, a backup power supply, an inverter output circuit, a mains power detection circuit, and a buzzer control circuit. The microcontroller is connected to the inverter output circuit, the mains power detection circuit, and the buzzer control circuit. The redundant AC input module is sequentially connected to the transformer-rectifier circuit and the power factor correction circuit. The power factor correction circuit is connected to the inverter output circuit and the charging circuit. The charging circuit is connected to the backup power supply and the maintenance-free battery pack. The mains power detection circuit is also connected to the transformer-rectifier circuit. The redundant AC input module includes a single-pole double-throw magnetic latching relay KM1. An RC snubber circuit is installed at both ends of the coil of the single-pole double-throw magnetic latching relay. The single-pole double-throw switch reliably ensures that at least one of the two AC 220V power supplies is always connected online. The two AC 220V mains power supplies come from two different distribution network branches.

[0018] The chips used in the transformer-rectifier circuit are LM7812 and LM7805. LM7812 refers to a three-terminal voltage regulator IC chip, suitable for various power supply voltage regulation circuits, offering good output stability, ease of use, and automatic overcurrent and overheat protection. LM7805 is a common three-terminal voltage regulator IC. In this series of integrated voltage regulator ICs, the number after LM78 indicates the output voltage of the three-terminal integrated voltage regulator circuit. For example, LM78012 indicates an output voltage of +12V, and LM7805 indicates an output voltage of +5V. AC220V is input through a socket, and transformer T1 outputs three channels: AC36V, AC12V, and AC5V. The AC12V is rectified and filtered, then processed by the LM7812 to output +12V, and the AC5V is rectified and filtered, then processed by the LM7805 to output +5V, meeting the power supply needs of the microcontroller and other circuit chips.

[0019] The microcontroller chip is AT89C2051, which integrates a general-purpose 8-bit central processing unit and Flash memory, is compatible with the standard MCS-51 instruction set, and contains 2kbytes of erasable and rewritable read-only program memory (PEROM) and 128 bytes of random access memory (RAM). The 24C02 is a 2Kbit serial EEPROM chip used to store the device's operating status. In this embodiment, the AT89C2051 microcontroller can control the inverter output circuit to enter or exit its operating state, and can also control the buzzer to sound to indicate abnormal power supply conditions.

[0020] The power factor correction circuit uses the UCC28019AD chip, a TI (Texas Instruments) PFC controller, specifically an 8-pin active power factor correction (PFC) controller operating in continuous conduction mode (CCM) boost topology. This controller is suitable for systems ranging from 100 W to >2 kW on a wide range of general-purpose AC line inputs. In this embodiment, power factor correction is performed on the VCC voltage, and a voltage with a qualified power factor is output from VOUT.

[0021] The inverter output circuit uses the PUCC27301AQDDARQ chip, a powerful N-channel MOSFET driver with an absolute maximum switching node (HS) rated voltage of 115V. This device allows control of two N-channel MOSFETs in topologies based on half-bridge or synchronous buck configurations. With a peak source current capability of 3.7A and a peak sink current capability of 4.5A, the UCC27301A-Q1 achieves extremely low switching losses during the switching process through the Miller flattening region while driving high-power MOSFETs, maintaining stable output power.

[0022] The backup power supply uses the URD_LD-20WR3 chip, a DC-DC module with an output voltage of 12V, an output current of 1.667A, an output power of 20W, and an efficiency (Typ) of 89%. Its function is to convert the battery voltage VOUT into DC +12V and DC +5V, enabling the backup power supply to participate in power generation. The LTC4079 EDD#PBF is a low-quiescent-current, high-efficiency, high-voltage linear charger used to charge maintenance-free battery packs.

[0023] The mains power detection circuit uses a 78L05 chip, a three-terminal voltage regulator. This regulator precisely locks the 5V output through an internal feedback loop. The circuit input detects the VTEST signal in the transformer-rectifier circuit, and the output is sent to the TEST pin of the microcontroller, which receives a signal indicating whether mains power is available. When both mains power supplies are disconnected, the 78L05 output drops to near 0V, and the microcontroller issues a buzzer alarm signal.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An online UPS device with redundant AC input modules, comprising a cabinet and circuitry housed within the cabinet, characterized in that, The circuit includes a redundant AC input module, a transformer and rectifier circuit, a microcontroller, a power factor correction circuit, a charging circuit, a backup power supply, an inverter output circuit, a mains power detection circuit, and a buzzer control circuit. The microcontroller is connected to the inverter output circuit, the mains power detection circuit, and the buzzer control circuit. The redundant AC input module is connected to the transformer and rectifier circuit and the power factor correction circuit in sequence. The power factor correction circuit is connected to the inverter output circuit and the charging circuit in sequence. The charging circuit is connected to the backup power supply and the maintenance-free battery pack. The mains power detection circuit is also connected to the transformer and rectifier circuit. The redundant AC input module is equipped with a single-pole double-throw magnetic latching relay, and the coil of the single-pole double-throw magnetic latching relay is provided with an RC snubber circuit at both ends.

2. The online UPS device with redundant AC input module according to claim 1, characterized in that, The microcontroller uses an AT89C2051 chip.

3. The online UPS device with redundant AC input module according to claim 1, characterized in that, The chips in the transformer rectifier circuit are LM7812 and LM7805.

4. An online UPS device with a redundant AC input module according to claim 1, characterized in that, The power factor correction circuit uses a UCC28019AD chip.

5. An online UPS device with a redundant AC input module according to claim 1, characterized in that, The chip model of the inverter output circuit is PUCC27301AQDDARQ.

6. An online UPS device with a redundant AC input module according to claim 1, characterized in that, The backup power supply uses a URD_LD-20WR3 chip; the charging circuit uses an LTC4079EDD#PBF chip.

7. An online UPS device with a redundant AC input module according to claim 1, characterized in that, The chip model of the mains power detection circuit is 78L05.

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