Battery automatic input circuit and FTU power supply

Abstract

The embodiment of the utility model discloses a battery automatic input circuit and an FTU power supply, the battery automatic input circuit sets an automatic input point voltage through a resistor R4 and a resistor R6, when the battery voltage is greater than a turn-on threshold voltage of an MOS tube Q2, the MOS tube Q2 is turned on, current flows through the GND by the resistor R2, the MOS tube Q1 is turned on, at the moment, the battery is automatically input successfully to supply power to a load V01 +, and the FTU power supply supplies power to the load V01 +. And the capacitor C1, the resistor R3 and the diode D4 form a self-discharge loop, so that repeated input operation of the battery is supported, the FTU power supply can be automatically input, and power is supplied to a post-stage load after the FTU power supply is connected. The FTU power supply is simple in structure, low in cost, stable and reliable, the FTU power supply can be automatically switched on, power is supplied to a post-stage load after connection, and the FTU power supply is suitable for popularization and application.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuits, and in particular to an automatic battery switching circuit and an FTU power supply. Background Technology

[0002] Feeder Terminal Unit (FTU) power supplies are a crucial component of distribution automation systems, typically installed on feeders in medium-voltage distribution networks to monitor and control the status of power lines. The main functions of an FTU include monitoring line voltage, current, and power parameters, detecting faults, and performing protective actions such as circuit breaker operation. Therefore, a stable and reliable power supply is essential for ensuring the normal operation of the FTU. An FTU power supply can operate immediately upon receiving AC power, providing output current to the load and simultaneously charging the battery with constant current and voltage. After charging is complete, the power supply automatically switches to float charging mode, providing float charging voltage and current to compensate for the battery's normal self-discharge. When the input power fails, the battery continuously supplies power to the load. However, existing FTU power supplies cannot automatically switch on, failing to provide power to downstream loads immediately upon connection, impacting user experience. This problem urgently needs to be solved. Summary of the Invention

[0003] In view of this, the present invention provides an automatic battery switching circuit and an FTU power supply to solve the problems mentioned in the background section above.

[0004] To achieve the above objectives, the embodiments of this utility model adopt the following technical solutions:

[0005] In a first aspect, this utility model provides an automatic battery switching circuit, which includes: diode D1, MOSFET Q1, resistor R1, resistor R2, MOSFET Q2, resistor R3, resistor R4, diode D2, diode D3, capacitor C1, diode D4, and resistor R5; the anode of diode D1 is connected to the drain of MOSFET Q1, the cathode of diode D1 is connected to the load terminal V01+, the source of MOSFET Q1 is connected to the positive terminal BAT+ of the battery and one end of resistor R1, the other end of resistor R1 is connected to one end of resistor R2 and the gate of MOSFET Q1, and the other end of resistor R2 is connected to the battery gate. The gate of MOSFET Q2 is connected to one end of resistor R6 and one end of resistor R4. The other end of resistor R6 is connected to the source of MOSFET Q2 and then grounded to GND. The other end of resistor R4 is connected to the cathode of diode D3. The anode of diode D3 is connected to one end of resistor R5. The other end of resistor R5 is connected to one end of capacitor C1 and the cathode of diode D4. The anode of diode D4 is connected to one end of resistor R3 and then grounded to GND. The other end of resistor R3 is connected to the other end of capacitor C1 and the cathode of diode D2. The anode of diode D2 is connected to the positive terminal BAT+ of the battery.

[0006] Secondly, this utility model embodiment provides an FTU power supply, which includes an automatic battery switching circuit; the automatic battery switching circuit includes diode D1, MOSFET Q1, resistors R1 and R2, MOSFET Q2, resistors R3 and R4, diode D2 and diode D3, capacitor C1, diode D4, and resistor R5; the anode of diode D1 is connected to the drain of MOSFET Q1, the cathode of diode D1 is connected to the load terminal V01+, the source of MOSFET Q1 is connected to the positive terminal BAT+ of the battery and one end of resistor R1, the other end of resistor R1 is connected to one end of resistor R2 and the gate of MOSFET Q1. The other end of resistor R2 is connected to the drain of MOSFET Q2. The gate of MOSFET Q2 is connected to one end of resistor R6 and one end of resistor R4. The other end of resistor R6 is connected to the source of MOSFET Q2 and then grounded to GND. The other end of resistor R4 is connected to the cathode of diode D3. The anode of diode D3 is connected to one end of resistor R5. The other end of resistor R5 is connected to one end of capacitor C1 and the cathode of diode D4. The anode of diode D4 is connected to one end of resistor R3 and then grounded to GND. The other end of resistor R3 is connected to the other end of capacitor C1 and the cathode of diode D2. The anode of diode D2 is connected to the positive terminal BAT+ of the battery.

[0007] In this embodiment of the invention, resistors R4 and R6 are used to set the automatic switching voltage. When the battery voltage is greater than the turn-on threshold voltage of MOSFET Q2, MOSFET Q2 turns on, current flows through resistor R2 to GND, and MOSFET Q1 turns on. At this time, the battery automatically switches on successfully, supplying power to the load V01+. Capacitor C1, resistor R3, and diode D4 form a self-discharge circuit, thus supporting repeated battery switching operations. This allows the FTU power supply to automatically switch on and supply power to the downstream load immediately upon connection. This invention has a simple structure, low cost, and is stable and reliable, enabling the FTU power supply to automatically switch on and supply power to the downstream load immediately upon connection, making it suitable for widespread application. Attached Figure Description

[0008] To more clearly illustrate and understand the technical solutions in the embodiments of this utility model, the accompanying drawings used in the background technology and embodiment description of this utility model will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of the automatic battery insertion circuit provided in an embodiment of the present invention. Detailed Implementation

[0010] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0011] Example 1

[0012] like Figure 1 As shown, Figure 1 This is a schematic diagram of the automatic battery insertion circuit provided in an embodiment of the present invention.

[0013] This embodiment provides an automatic battery switching circuit, which includes: diode D1, MOSFET Q1, resistors R1 and R2, MOSFET Q2, resistors R3 and R4, diode D2 and diode D3, capacitor C1, diode D4, and resistor R5; the anode of diode D1 is connected to the drain of MOSFET Q1, and the cathode of diode D1 is connected to the load terminal V01+; the source of MOSFET Q1 is connected to the positive terminal BAT+ of the battery and one end of resistor R1; the other end of resistor R1 is connected to one end of resistor R2 and the gate of MOSFET Q1; the other end of resistor R2 is connected to the MOSFET... The drain of transistor Q2 is connected. The gate of MOSFET Q2 is connected to one end of resistor R6 and one end of resistor R4. The other end of resistor R6 is connected to the source of MOSFET Q2 and then grounded to GND. The other end of resistor R4 is connected to the cathode of diode D3. The anode of diode D3 is connected to one end of resistor R5. The other end of resistor R5 is connected to one end of capacitor C1 and the cathode of diode D4. The anode of diode D4 is connected to one end of resistor R3 and then grounded to GND. The other end of resistor R3 is connected to the other end of capacitor C1 and the cathode of diode D2. The anode of diode D2 is connected to the positive terminal BAT+ of the battery.

[0014] During operation, the automatic switching voltage is set via resistors R4 and R6. When the battery voltage exceeds the turn-on threshold voltage of MOSFET Q2, MOSFET Q2 turns on, current flows through resistor R2 to GND, and MOSFET Q1 turns on. At this point, the battery automatically switches on successfully, supplying power to the load V01+. Capacitor C1, resistor R3, and diode D4 form a self-discharge circuit, supporting repeated battery switching operations. This allows the FTU power supply to automatically switch on and supply power to the downstream load upon connection. This invention features a simple structure, low cost, and stable reliability, enabling automatic FTU power supply and immediate power supply to the downstream load upon connection, making it suitable for widespread application.

[0015] Example 2

[0016] This embodiment provides an FTU power supply, which includes the automatic battery switching circuit described in Embodiment 1 above. The automatic battery switching circuit includes diode D1, MOSFET Q1, resistors R1 and R2, MOSFET Q2, resistors R3 and R4, diodes D2 and D3, capacitor C1, diode D4, and resistor R5. The anode of diode D1 is connected to the drain of MOSFET Q1, and the cathode of diode D1 is connected to the load terminal V01+. The source of MOSFET Q1 is connected to the positive terminal BAT+ of the battery and one end of resistor R1. The other end of resistor R1 is connected to one end of resistor R2 and the gate of MOSFET Q1. The other end of resistor R2 is connected to the drain of MOSFET Q2. The gate of MOSFET Q2 is connected to one end of resistor R6 and one end of resistor R4. The other end of resistor R6 is connected to the source of MOSFET Q2 and then grounded to GND. The other end of resistor R4 is connected to the cathode of diode D3. The anode of diode D3 is connected to one end of resistor R5. The other end of resistor R5 is connected to one end of capacitor C1 and the cathode of diode D4. The anode of diode D4 is connected to one end of resistor R3 and then grounded to GND. The other end of resistor R3 is connected to the other end of capacitor C1 and the cathode of diode D2. The anode of diode D2 is connected to the positive terminal BAT+ of the battery.

[0017] During operation, the automatic switching point voltage is set through resistors R4 and R6. When the battery voltage is greater than the turn-on threshold voltage of MOSFET Q2, MOSFET Q2 turns on, and current flows through resistor R2 to GND, turning on MOSFET Q1. At this time, the battery is automatically switched on successfully to supply power to the load V01+. Capacitor C1, resistor R3 and diode D4 form a self-discharge circuit, which supports repeated battery switching operations, enabling the FTU power supply to automatically switch on and supply power to the downstream load after connection.

[0018] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An automatic battery charging circuit, characterized in that, The circuit includes: diode D1, MOSFET Q1, resistors R1 and R2, MOSFET Q2, resistors R3 and R4, diodes D2 and D3, capacitor C1, diode D4, and resistor R5. The anode of diode D1 is connected to the drain of MOSFET Q1, and the cathode of diode D1 is connected to the load terminal V01+. The source of MOSFET Q1 is connected to the positive terminal BAT+ of the battery, one end of resistor R1, the other end of resistor R1 is connected to one end of resistor R2, the gate of MOSFET Q1, and the other end of resistor R2 is connected to the drain of MOSFET Q2. The gate of MOSFET Q2 is connected to one end of resistor R6 and one end of resistor R4. The other end of resistor R6 is connected to the source of MOSFET Q2 and grounded to GND. The other end of resistor R4 is connected to the cathode of diode D3. The anode of diode D3 is connected to one end of resistor R5. The other end of resistor R5 is connected to one end of capacitor C1 and the cathode of diode D4. The anode of diode D4 is connected to one end of resistor R3 and grounded to GND. The other end of resistor R3 is connected to the other end of capacitor C1 and the cathode of diode D2. The anode of diode D2 is connected to the positive terminal BAT+ of the battery.

2. An FTU power supply, characterized in that, Includes the automatic battery insertion circuit as described in claim 1.

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