CN-224233387-U - Automatic switching-on circuit of battery and FTU power supply

Abstract

The embodiment of the utility model discloses an automatic battery switching-in circuit and an FTU power supply, wherein the automatic battery switching-in circuit sets automatic switching-in point voltage through a resistor R4 and a resistor R6, when the battery voltage is larger than the switching-on threshold voltage of a MOS tube Q2, the MOS tube Q2 is conducted, the resistor R2 is used for flowing current to GND, the MOS tube Q1 is switched on, the automatic battery switching-in is successful in supplying power to a load V01+, and a self-discharging loop is formed by a capacitor C1, a resistor R3 and a diode D4, so that repeated switching-in operation of the battery is supported, the FTU power supply can be switched in automatically, and power is supplied to a load at a later stage after switching-in is realized. The utility model has simple structure, low cost, stability and reliability, ensures that the FTU power supply can be automatically input, supplies power to the post-stage load after the access is realized, and is suitable for popularization and application.

Inventors

• CHEN YOU
• LIU HAIXIONG
• BAI YONG

Assignees

• 无锡市金赛德电子有限公司

Dates

Publication Date

20260512

Application Date

20241231

Claims (2)

1. 1. The automatic battery input circuit is characterized by comprising a diode D1, a MOS (metal oxide semiconductor) transistor Q1, a resistor R2, a MOS transistor Q2, a resistor R3, a resistor R4, a diode D2, a diode D3, a capacitor C1, a diode D4 and a resistor R5, wherein the positive electrode of the diode D1 is connected with the drain electrode of the MOS transistor Q1, the negative electrode of the diode D1 is connected with a load end V01+, the source electrode of the MOS transistor Q1 is connected with one end BAT+ of a battery, one end of the resistor R1 is connected with one end of the resistor R2 and the grid electrode of the MOS transistor Q1, the other end of the resistor R2 is connected with the drain electrode of the MOS transistor Q2, the grid electrode of the MOS transistor Q2 is connected with one end of the resistor R6 and one end of the resistor R4, the other end of the resistor R6 is grounded GND after being connected with the source electrode of the MOS transistor Q2, the other end of the diode D3 is connected with the negative electrode of the diode D3, the positive electrode of the diode D3 is connected with one end of the resistor R5, and the other end of the diode C5 is connected with the positive electrode of the diode C4 and the diode D2 after the other end of the resistor C4 is connected with the anode of the resistor D2.
2. 2. An FTU power supply comprising the battery automatic switching circuit of claim 1.

Description

Automatic switching-on circuit of battery and FTU power supply Technical Field The embodiment of the utility model relates to the field of electronic circuits, in particular to an automatic battery switching circuit and an FTU power supply. Background Feeder terminal Unit (FEEDER TERMINAL Unit, FTU) power supplies are an important component in power distribution automation systems, typically mounted on the feeder lines of a medium voltage distribution network, for monitoring and controlling the status of the power lines. The main functions of the FTU include monitoring line voltage, current, power, etc., detecting faults, and performing protective actions such as the operation of the circuit breaker. Therefore, a stable and reliable power supply is critical to ensure proper operation of the FTU. The FTU power supply can work after inputting alternating current to provide output current for the load, meanwhile, the battery can be charged in a constant-current and constant-voltage mode, after the charging is completed, the power supply automatically changes into a floating charging state, the power supply provides floating charging voltage and current to supplement normal self-discharging of the battery, and when the input is in power failure, the battery continuously supplies power for the load. However, the existing FTU power supply cannot be automatically switched on, and power can not be supplied to a later stage load after the power is switched on, so that the use of a user is affected, and the problem needs to be solved. Disclosure of Invention In view of the above, the present utility model provides an automatic battery switching circuit and an FTU power supply to solve the above-mentioned problems in the background art. In order to achieve the above purpose, the embodiment of the present utility model adopts the following technical scheme: In a first aspect, the embodiment of the utility model provides an automatic battery input circuit, which comprises a diode D1, a MOS (metal oxide semiconductor) tube Q1, a resistor R2, a MOS tube Q2, a resistor R3, a resistor R4, a diode D2, a diode D3, a capacitor C1, a diode D4 and a resistor R5, wherein the anode of the diode D1 is connected with the drain electrode of the MOS tube Q1, the cathode of the diode D1 is connected with a load end V01+, the source electrode of the MOS tube Q1 is connected with one end of a battery anode BAT+ and a resistor R1, the other end of the resistor R1 is connected with one end of the resistor R2 and the grid electrode of the MOS tube Q1, the other end of the resistor R2 is connected with the drain electrode of the MOS tube Q2, the grid electrode of the MOS tube Q2 is connected with one end of the resistor R6, the other end of the resistor R4 is connected with the ground GND after the source electrode of the MOS tube Q2 is connected, the other end of the resistor R6 is connected with the cathode of the diode D3, the anode of the diode D3 is connected with one end of the resistor R5, the other end of the anode of the resistor C5 is connected with the anode of the diode D4 is connected with the anode of the diode C2, and the other end of the anode of the diode C4 is connected with the anode of the diode C2 is connected with the anode of the resistor 2. In a second aspect, the embodiment of the utility model provides an FTU power supply, which comprises an automatic battery input circuit, wherein the automatic battery input circuit comprises a diode D1, a MOS (metal oxide semiconductor) tube Q1, a resistor R2, a MOS tube Q2, a resistor R3, a resistor R4, a diode D2, a diode D3, a capacitor C1, a diode D4 and a resistor R5, the positive electrode of the diode D1 is connected with the drain electrode of the MOS tube Q1, the negative electrode of the diode D1 is connected with a load end V01+, the source electrode of the MOS tube Q1 is connected with the positive electrode BAT+ of a battery, one end of the resistor R1 is connected with one end of the resistor R2, the other end of the resistor R1 is connected with one end of the gate electrode of the MOS tube Q1, the other end of the resistor R2 is connected with the drain electrode of the MOS tube Q2, one end of the gate electrode of the MOS tube Q2 and one end of the resistor R6 are connected with one end of the resistor R4, the other end of the resistor R6 is connected with the source electrode of the MOS tube Q2 and then grounded GND, the other end of the resistor R4 is connected with the negative electrode of the diode D3, the positive electrode of the diode D3 is connected with the negative electrode of the diode C5 and the other end of the resistor C2 is connected with the positive electrode of the capacitor C1 and the diode C2 is connected with the positive electrode of the diode 2. According to the technical scheme provided by the embodiment of the utility model, the resistor R4 and the resistor R6 are used for setting the voltage of an automatic input point, when the voltage