Low-cost relayless ups system based on buck circuit multiplexing technology

Abstract

The utility model relates to low -cost relayless UPS system based on BUCK circuit multiplexing technique, include: input unit, access charging cabinet 12V DC power supply adapter, as normal work's main power supply, for charging cabinet inside control panel, display screen and load battery power supply, BUCK voltage reduction charging unit contains power MOS pipe Q1, high -frequency inductance L1, schottky diode D1 and PI controller, the PI controller connects battery voltage sampling circuit and power MOS pipe Q1's grid, power supply switching unit, utilize the one -way conduction of schottky diode D1 and potential difference realizes contactless switching, load battery unit, when the main power supply failure, through schottky diode D1 for load power supply. Its integrated battery identification and dynamic charging control, has promoted the power supply reliability and charging efficiency. This scheme because no relay, topological volume reduces 25% while compatible multiple battery power supply function, switching time is less than 10ms, charging efficiency improves 20%. Solve the traditional UPS adaptation charging cabinet problem.

Description

Technical Field

[0001] This utility model relates to the field of UPS power supply technology, and in particular to a low-cost relay-free UPS system based on BUCK circuit multiplexing technology. Background Technology

[0002] In recent years, as social production and daily life have become increasingly reliant on electrical equipment, the stability and reliability of equipment operation have become decisive factors in ensuring continuous system operation and maintaining industrial production. Due to the widespread use of industrial electrical equipment, the demand for power supply reliability standards to avoid power outages is increasing. Driven by market demand, uninterruptible power supplies (UPS) have become an essential solution. High performance and high efficiency of UPS have become the focus of competition.

[0003] In charging cabinet applications, providing a stable power supply is crucial. Traditional charging cabinet power supply solutions have shortcomings: Firstly, if the AC-DC adapter relying on mains power fails, it can easily lead to power outages and data loss for the equipment inside the charging cabinet. Existing UPS systems mostly use relay switching, which is slow to respond and susceptible to electromagnetic interference within the charging cabinet, causing arcing and equipment damage. Secondly, the diverse battery types within the charging cabinet mean that traditional charging control modes cannot accurately adapt to different battery charging curves, resulting in low charging efficiency and impacting battery life. Simultaneously, the compact space of charging cabinets necessitates a miniaturized and integrated UPS topology, creating a pressing need for a solution that adapts to the charging cabinet scenario and balances efficient power switching with precise charging control. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a low-cost relay-free UPS system based on BUCK circuit multiplexing technology. It is an uninterruptible power supply (UPS) adapted to charging cabinets, which solves the problems mentioned in the background technology.

[0005] The above-mentioned utility model objective is achieved through the following technical solution:

[0006] Low-cost relay-free UPS systems based on BUCK circuit multiplexing technology include:

[0007] The input unit connects to the AC-DC power adapter of the charging cabinet's 12V DC power supply, which serves as the main power source for normal operation, supplying power to the control board, display screen, and load batteries inside the charging cabinet.

[0008] The BUCK buck charging unit includes a power MOSFET Q1, a high-frequency inductor L1, a Schottky diode D1, and a PI controller. The PI controller is connected to the battery voltage sampling circuit and the gate of the power MOSFET Q1.

[0009] The power supply switching unit utilizes the unidirectional conductivity and potential difference of the Schottky diode D1 to achieve contactless switching;

[0010] The load battery unit supplies power to the load via Schottky diode D1 when the main power supply fails.

[0011] As a further technical solution of this utility model: the PI controller is connected to the battery identification module and dynamically adjusts the duty cycle of the MOS transistor to adapt to the charging curve of the lithium battery / lead-acid battery.

[0012] As a further technical solution of this utility model: the power supply switching response time is <10ms, and mechanical switching is achieved by the Schottky diode D1 and the battery potential difference working together.

[0013] In summary, this utility model has at least one of the following beneficial technical effects:

[0014] This utility model discloses a low-cost, relay-free UPS system based on BUCK circuit multiplexing technology, mainly relating to the field of UPS power supply technology. The topology includes a DC 12V adapter power supply, a BUCK step-down circuit, a PI controller with multi-battery curve adaptation, and load batteries. During normal operation, the AC-DC adapter provides power and charges the batteries via the PI-adapted charging curve. In case of a fault, the batteries automatically take over from the adapter to power the load. The innovation of this utility model lies in its adaptation to charging cabinet scenarios, integrating battery identification and dynamic charging control, thus improving power supply reliability and charging efficiency. Because this solution eliminates relays, the topology size is reduced by 25% while remaining compatible with multiple battery power supply functions, with a switching time of less than 10ms and a 20% improvement in charging efficiency. It solves the problem of adapting traditional UPS systems to charging cabinets. Attached Figure Description

[0015] Figure 1 This is the circuit diagram of this utility model. Detailed Implementation

[0016] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0017] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0018] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0019] Example 1:

[0020] Reference Figure 1 The present invention discloses a low-cost, relay-free UPS system based on BUCK circuit multiplexing technology, comprising:

[0021] The input unit connects to the AC-DC power adapter of the charging cabinet's 12V DC power supply, serving as the main power source for normal operation and supplying power to the control board, display screen, and load batteries inside the charging cabinet.

[0022] The BUCK buck charging unit includes a power MOSFET Q1, a high-frequency inductor L1, a Schottky diode D1, and a PI controller. The PI controller is connected to the battery voltage sampling circuit and the gate of the power MOSFET Q1. The BUCK buck charging unit mainly consists of a low on-resistance power MOSFET, a high-frequency inductor, and a Schottky diode. Combined with a PI (proportional-integral) controller power management chip, it identifies different types of batteries (such as lithium batteries / lead-acid batteries) in the charging cabinet through a battery identification module and dynamically adjusts the MOSFET duty cycle to efficiently charge batteries with different loads.

[0023] The power supply switching unit utilizes the unidirectional conductivity and potential difference of the Schottky diode D1 to achieve contactless switching. By leveraging the unidirectional conductivity of the Schottky diode and combining it with the potential difference between the main power supply and the load battery in the charging cabinet, it achieves intelligent and seamless switching between AC-DC power supply and load battery power supply without the need for additional mechanical switching components.

[0024] The load battery unit supplies power to the load via Schottky diode D1 when the main power supply fails. The load battery serves as a backup power source for the charging cabinet, storing electrical energy and outputting 12V to maintain timely power supply to key modules (main control board, display screen, communication board) in the event of a main power failure.

[0025] The PI controller connects to the battery identification module and dynamically adjusts the duty cycle of the MOSFET to adapt to the charging curves of lithium / lead-acid batteries. The power supply switching response time is <10ms, achieved through mechanical-free switching via the coordinated action of Schottky diode D1 and the battery potential difference.

[0026] When operating normally, the AC-DC adapter outputs 12V DC power, directly powering the charging cabinet's display screen, control board, and other modules. It can also simultaneously provide precise power to the load battery on the other side. This is mainly achieved by using a PI controller to collect data on the load battery's type (e.g., lithium battery / lead-acid battery) and status (voltage, current, SOC, etc.) from the battery identification module. The controller then dynamically adjusts the duty cycle of the MOSFETs in the BUCK circuit to dynamically reduce the 12V voltage to match the charging curves of different batteries, thus enabling dynamic and efficient charging of the load battery.

[0027] In the event of a fault, if the AC-DC adapter fails, the potential difference of the load battery will be higher than that of the charging cabinet's load power supply terminal. The load battery will then directly output 12V, seamlessly taking over the main power supply and providing timely power to critical loads in the charging cabinet (main control board, display screen, communication board, etc.). This ensures a fast response time (<10ms) and strong anti-interference capability with no mechanical contact switching throughout the process. Simultaneously, the PI controller performs real-time charging control and enters a low-power detection mode, awaiting the main power supply's restoration.

[0028] The implementation principle of this utility model is as follows: This utility model discloses a low-cost, relay-free UPS system based on BUCK circuit multiplexing technology, mainly relating to the field of UPS power supply technology. The topology includes a DC 12V adapter power supply, a BUCK step-down circuit, a PI controller with multi-battery curve adaptation, and load batteries. During normal operation, the AC-DC adapter provides power and charges the batteries via the PI-adapted charging curve. In case of a fault, the batteries automatically take over from the adapter to power the load. The innovation of this utility model lies in its adaptation to charging cabinet scenarios, integrating battery identification and dynamic charging control, thus improving power supply reliability and charging efficiency. Because this solution eliminates relays, the topology size is reduced by 25% while remaining compatible with multiple battery power supply functions, with a switching time of less than 10ms and a 20% improvement in charging efficiency. It solves the problem of adapting traditional UPS systems to charging cabinets.

[0029] The embodiments described herein are preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape, and principle of this utility model should be included within the scope of protection of this utility model.

Claims

1. A low-cost, relay-free UPS system based on BUCK circuit multiplexing technology, characterized in that, include: The input unit connects to the AC-DC power adapter of the charging cabinet's 12V DC power supply, which serves as the main power source for normal operation, supplying power to the control board, display screen, and load batteries inside the charging cabinet. The BUCK buck charging unit includes a power MOSFET Q1, a high-frequency inductor L1, a Schottky diode D1, and a PI controller. The PI controller is connected to the battery voltage sampling circuit and the gate of the power MOSFET Q1. The power supply switching unit utilizes the unidirectional conductivity and potential difference of the Schottky diode D1 to achieve contactless switching; The load battery unit supplies power to the load via Schottky diode D1 when the main power supply fails.

2. The low-cost relay-free UPS system based on BUCK circuit multiplexing technology according to claim 1, characterized in that, The PI controller is connected to the battery identification module and dynamically adjusts the duty cycle of the MOS transistor to adapt to the charging curve of the lithium battery / lead-acid battery.

3. The low-cost relay-free UPS system based on BUCK circuit multiplexing technology according to claim 1, characterized in that, The power supply switching response time is less than 10ms, and mechanical switching is achieved by the Schottky diode D1 and the battery potential difference working together.

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