Vacuum cleaner having a dual power supply

摘要: A vacuum cleaner comprising a motor and power supply. The supply comprises input terminals for connection to an AC source, output connected the motor, AC-to-DC stage, battery. stage converts alternating current drawn from source into direct that is supplied battery motor. operates in first mode when disconnected second source. When mode, either low-power state or high-power state. state, each draw such charges. draws both discharges.