CN-122001071-A - Domestic alternating current and direct current power supply isolation output switching device

CN122001071ACN 122001071 ACN122001071 ACN 122001071ACN-122001071-A

Abstract

The invention belongs to the technical field of power management, and particularly provides an alternating current and direct current power supply isolation output switching device which comprises a power supply input and preprocessing module, a power supply detection and control module, a relay isolation switching module and an output adaptation and protection module, wherein the power supply input and preprocessing module is used for connecting an alternating current main power supply and a direct current standby power supply, respectively preprocessing and protecting the two paths of power supplies, the power supply detection and control module is used for collecting electric parameters of the alternating current main power supply and the direct current standby power supply in real time, judging a power supply state according to a collecting result and outputting a control signal, the relay isolation switching module comprises two relays respectively corresponding to a main power supply branch and a standby power supply branch, and realizing physical isolation and automatic switching of the alternating current power supply and the direct current power supply based on the control signal, and the output adaptation and protection module is used for providing corresponding output branches according to load types and protecting the output power supplies, wherein the two relays adopt an interlocking design to ensure non-simultaneous conduction.

Inventors

Tong Anjie
ZHU XIANGWU
XU YEFEI
ZHU BIAO
TONG YUZHOU

Assignees

中航华东光电有限公司

Dates

Publication Date: 20260508
Application Date: 20260129

Claims (10)

1. An ac and dc power isolated output switching apparatus comprising: The power input and pretreatment module is used for accessing an alternating current main power supply and a direct current standby power supply and respectively carrying out pretreatment protection on the two paths of power supplies; The power supply detection and control module is used for acquiring the electric parameters of the alternating current main power supply and the direct current standby power supply in real time, judging the power supply state of the power supply according to the acquisition result and outputting a control signal; the relay isolation switching module comprises two relays respectively corresponding to a main power supply branch and a standby power supply branch, and realizes physical isolation and automatic switching of an alternating current power supply and a direct current power supply based on the control signals; The output adapting and protecting module is used for providing a corresponding output branch according to the load type and protecting an output power supply; the two relays adopt an interlocking design, so that the two relays are ensured not to be conducted simultaneously.
2. An ac and dc power isolated output switching apparatus as in claim 1, wherein said interlock design comprises a hardware interlock and a software interlock; The hardware interlock is realized by connecting the normally closed contact of the first relay in series in the coil loop of the second relay and connecting the normally closed contact of the second relay in series in the coil loop of the first relay; the software interlock ensures mutual exclusion of control signals of the two relays through a control program.
3. The ac and dc power isolated output switching apparatus of claim 1, wherein said power input and preprocessing module comprises: an alternating current input branch circuit, an air switch, an EMI filtering module and a piezoresistor are connected in series; The direct current input branch is connected with the direct current fuse and the direct current filter capacitor in series.
4. The alternating current and direct current power supply isolation output switching device according to claim 1, wherein the power supply detection and control module comprises a single chip microcomputer, acquires the voltage and frequency of an alternating current main power supply and the voltage and current of a direct current standby power supply in real time, outputs a switching control signal within 10ms when a main power supply fault is detected, and delays 3-5s to output the switching control signal after the main power supply is recovered to be normal.
5. The ac and dc power isolated output switching apparatus of claim 1, wherein the relay isolated switching module further comprises a contact protection circuit comprising: An RC absorption circuit with parallel relay contacts of an alternating current main power supply branch; and/or the two ends of the relay coil of the direct-current standby power supply branch are reversely connected with the flywheel diode in parallel.
6. An ac and dc power isolated output switching apparatus as claimed in claim 1, wherein said output adaptation and protection module comprises: an alternating current load output branch circuit is connected in series with an overcurrent protection relay; and/or, a direct current load output branch is connected with a transient suppression diode in parallel and is connected with a current sampling resistor in series.
7. An ac and dc power isolated output switching apparatus as in claim 1, further comprising a status display and alarm module for displaying a power status and alerting in the event of a power failure.
8. The ac and dc power isolated output switching apparatus of claim 7, wherein the status display and alarm module comprises an LED indicator and a buzzer, and wherein the expandable communication interface uploads fault information to the monitoring system.
9. An ac and dc power isolated output switching apparatus as in claim 1, further comprising a capacitor in parallel with the output stage for maintaining the load supply during power switching.
10. The ac and dc power isolated output switching apparatus of claim 4, wherein the power detection circuit of the power detection and control module comprises: the alternating current detection branch circuit converts an alternating current power supply into a direct current signal and transmits the direct current signal to the singlechip; and the direct current detection branch circuit is connected to an ADC pin of the singlechip after the direct current power supply is divided, and the direct current is collected through the current detection chip.

Description

Domestic alternating current and direct current power supply isolation output switching device Technical Field The invention belongs to the technical field of power management, and particularly relates to a domestic alternating current and direct current power supply isolation output switching device. Background In critical occasions (such as military equipment, communication base stations and industrial control systems) requiring power supply continuity, a dual-redundancy power supply system consisting of an alternating-current main power supply and a direct-current standby power supply is often adopted. When the main power supply fails, the standby power supply needs to be automatically switched to ensure that the load is not powered off. At present, the device for realizing automatic switching of dual power supplies mainly has the following technical defects: The interlocking reliability is insufficient, and the risk of short circuit exists, namely, the common switching device mostly adopts single interlocking logic (such as hardware interlocking only by means of normally closed contacts of a relay or interlocking only by means of control software). When hardware contacts are adhered or a software program runs, the single interlocking mode has a great risk that the main power relay and the standby power relay are simultaneously conducted, and power short circuit and equipment burning can be caused. The switching process has large impact on the device and short service life, and when the relay is disconnected with inductive or capacitive load, arc or reverse electromotive force can be generated between contacts. The existing design often lacks the pertinence protection, leads to serious relay contact electric erosion, coil drive circuit is easy to receive high voltage impact, and device reliability and life are reduced. The core element depends on import, the cost is high, the risk of a supply chain is high, and the high-reliability automatic switching device usually adopts imported special switching chips, relays and processors, so that the cost is high, and challenges of safety and autonomous controllability of the supply chain are faced in specific fields. The transient output of switching is unstable, and the switching time of partial schemes is too long, or voltage sag and burrs exist at the switching moment, so that the harsh requirements of precise loads on the quality of electric energy cannot be met. Simple circuit designs do not provide sustained energy buffering for the subsequent stage load during switching. Therefore, an ac/dc power supply isolation switching device with controllable cost, high reliability, rapid switching and suitability for domestic environment is urgently needed. Disclosure of Invention The invention aims to provide the alternating current/direct current isolation output switching device which is convenient for alternating current 220V and DC24V, avoids the condition that alternating current and direct current output are not compatible, and can be switched seamlessly under the condition of simultaneous power supply of alternating current and direct current. The technical scheme adopted for solving the technical problems is as follows: An ac and dc power isolated output switching device comprising: The power input and pretreatment module is used for accessing an alternating current main power supply and a direct current standby power supply and respectively carrying out pretreatment protection on the two paths of power supplies; The power supply detection and control module is used for acquiring the electric parameters of the alternating current main power supply and the direct current standby power supply in real time, judging the power supply state of the power supply according to the acquisition result and outputting a control signal; the relay isolation switching module comprises two relays respectively corresponding to a main power supply branch and a standby power supply branch, and realizes physical isolation and automatic switching of an alternating current power supply and a direct current power supply based on the control signals; The output adapting and protecting module is used for providing a corresponding output branch according to the load type and protecting an output power supply; the two relays adopt an interlocking design, so that the two relays are ensured not to be conducted simultaneously. In a preferred embodiment, the interlocking design includes hardware interlocking and software interlocking; The hardware interlock is realized by connecting the normally closed contact of the first relay in series in the coil loop of the second relay and connecting the normally closed contact of the second relay in series in the coil loop of the first relay; the software interlock ensures mutual exclusion of control signals of the two relays through a control program. In a preferred embodiment, the power input and pre-processing module comprises: an alternating curr