A smart charger with 0-load automatic power-off and intelligent wake-up function

Abstract

The application discloses a kind of intelligent charger with 0 load automatic power-off and intelligent wake-up function, it is related to power management technical field, by the current detection module of sampling resistance and differential amplifier composition real-time monitoring load state, when output current is continuously below threshold value, control module cuts off mains to eliminate standby power consumption, simultaneously by equipment insertion detection module such as USB data line or Type-C CC line signal realizes quick wake-up.Capacitor step-down circuit is used to independently power supply control module, compatible with PD / QC and other fast charging protocols, solve the problem of high standby power consumption and poor compatibility of traditional charger.It is suitable for mobile phone, tablet computer and other equipment charging, compatible with fast charging protocol and eliminate standby power consumption, solve the problem of energy waste and mispower-off, simultaneously reduce cost through capacitor step-down circuit.

Description

Technical Field

[0001] This invention relates to the field of power management technology, and in particular to a smart charger that can automatically cut off or restore power supply according to the load status. Background Technology

[0002] Traditional chargers still consume standby power (0.1~1W) even when no device is connected, leading to energy waste from prolonged plugging in. Current technologies use simple current detection to cut off power, but this suffers from high false alarm rates, incompatibility with fast charging protocols, and slow wake-up responses. Summary of the Invention

[0003] 1. Technical Solution: - Hardware architecture: - Main power supply module (AC-DC conversion), current detection module (sampling resistor + differential amplifier), control module (MCU), device insertion detection module (D+ / D- or CC line monitoring), independent standby power supply (capacitor step-down circuit).

[0004] 2. Control Logic: - When the output current is below the threshold (e.g., 50mA) for 5 seconds, the control MOSFET disconnects the main power supply; - The main power supply is woken up by the device insertion detection signal, and fast charging protocols such as PD / QC are supported.

[0005] 3. Beneficial effects: - Standby power consumption is close to 0W; - Compatible with mainstream fast charging protocols to prevent accidental power outages; - Achieve low-cost independent power supply through a capacitor-based step-down circuit.

Claims

1. A smart charger, characterized in that, include: - Main power module, used to convert AC power to DC power output; - Current detection module, which monitors the output current in real time through sampling resistor and differential amplifier; -Device insertion detection module determines the device connection status based on USB data cable or CC cable signals; - The control module disconnects the main power supply when the current value remains below the set threshold and restores power supply when a device is detected being inserted; - Independent standby power supply module provides power to the control module and device insertion detection module during power outages.

2. The charger according to claim 1, characterized in that, The independent standby power supply module is a capacitor step-down circuit.

3. The charger according to claim 1, characterized in that, The device insertion detection module supports the PD / QC fast charging protocol.

4. The charger according to claim 1, characterized in that, The power failure determination logic of the control module includes a delay filtering algorithm.