一种电子直流双电源切换装置

Abstract

本实用新型公开了一种电子直流双电源切换装置，属于双电源切换技术领域。一种电子直流双电源切换装置，包括直流负载设备，还包括：交流电源输入端，用于连接外部交流电源；直流电源输入端，用于连接直流负载设备；直流负载输出端，用于连接直流负载设备；双向整流模块；通过控制单元导通第一电子开关、断开第二电子开关，交流电源经双向整流模块整流后通过第一电子开关向负载供电，同时储能电容C1充电；当交流电源电压异常低于第一预设阈值或高于第二预设阈值时，控制单元立即断开第一电子开关、导通第二电子开关，直流电源通过第二电子开关向负载供电，实现无缝切换，从而避免使用者的通信关键信息无法发出问题，进一步提高了设备的稳定性。

Claims

1. An electronic DC dual power supply switching device comprising a DC load device (100), characterized in that, The electronic DC dual power supply switching device further includes an AC power input terminal (1), a DC power input terminal (2), a DC load output terminal (3), a bidirectional rectifier module (4), a switching module (5), a control unit (6), a power detection module (7), and an energy storage buffer module (8). The AC power input terminal (1) is connected to an external AC power source; the DC power input terminal (2) and the DC load output terminal (3) are both connected to the DC load device (100); the bidirectional rectifier module (4) is connected in series between the AC power input terminal (1) and the DC load output terminal (3); the switching module (5) is located between the bidirectional rectifier module (4) and the DC power input terminal (8). 2) Between, the switching module (5) includes at least two low on-resistance first electronic switches and second electronic switches, the first electronic switches are connected in series between the bidirectional rectifier module (4) and the DC load output terminal (3), and the second electronic switches are connected in series between the DC power input terminal (2) and the DC load output terminal (3); the control unit (6) is electrically connected to the switching module (5); the power detection module (7) is electrically connected to the AC power input terminal (1), the DC power input terminal (2) and the control unit (6) respectively; the energy storage buffer module (8) is connected in parallel to the DC load output terminal (3), and the energy storage buffer module (8) includes at least one energy storage capacitor.

2. The electronic DC dual power switching device according to claim 1, wherein, The bidirectional rectifier module (4) is a full-bridge rectifier circuit or a synchronous rectifier circuit; the first electronic switch and the second electronic switch are anti-parallel semiconductor switching devices, and the conduction directions of the first electronic switch and the second electronic switch are opposite.

3. The electronic DC dual power switching device of claim 1, wherein, The power detection module (7) includes an AC voltage sampling circuit, a DC voltage sampling circuit and a comparison circuit; the AC voltage sampling circuit samples the voltage of the AC power input terminal (1) and converts it into an AC detection signal; the DC voltage sampling circuit samples the voltage of the DC power input terminal (2) and converts it into a DC detection signal; the comparison circuit outputs an AC power status signal to the control unit (6).

4. The electronic DC dual power switching device of claim 1, wherein, The control unit (6) is a microcontroller or a field-programmable gate array, and the control unit (6) is equipped with a switching delay suppression module.

5. The electronic DC dual power switching device of claim 4, wherein, An overvoltage protection module (9) is connected in series between the bidirectional rectifier module (4) and the switching module (5). The overvoltage protection module (9) includes a varistor or a transient voltage suppression diode.

6. The electronic DC dual power switching device of claim 1, wherein, A reverse connection protection unit (10) is provided between the DC power input terminal (2) and the switching module (5). The reverse connection protection unit (10) is a reverse blocking MOSFET or diode.

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