On-line UPS controllable from far end

• US 6,175,311 B1
• Filed: 02/17/2000
• Issued: 01/16/2001
• Est. Priority Date: 02/17/2000
• Status: Expired due to Fees

• Current Assignee: DIGI Power Manufacturing Incorporated
• Original Assignee: DIGI Power Manufacturing Incorporated
• Inventors: Li, Yung-Feng
• Primary Examiner(s): Wu, Daniel J.
• Assistant Examiner(s): Previl, Daniel
• Application Number:
  US09/505,850
• Time in Patent Office: 334 Days
• Field of Search: 340/657, 340/660, 340/664, 340/636, 340/644, 340/645, 340/693--69, 363/41, 363/13, 363/15, 363/26, 363/34, 363/35, 363/39, 307/67, 307/68, 307/150, 307/151, 307/64, 307/43, 307/44, 307/65
• US Class Current: 340/657
• CPC Class Codes: H02J 9/062 for AC powered loads

Abstract

An ON-LINE uninterrupted power supply (UPS) of this invention serving as a long term high quality power supply for web, telecommunication, security system, etc is characterized in detecting a ring signal from far end for ON/OFF control of an output power and in permitting omni-range input civil power to avoid any unstable output power.

Claims

1. An ON-LINE uninterrupted power supply (UPS) controllable from far end, comprising:

an AC/DC converter utilized to convert an AC input power into a DC power by a bridge rectifier for supplying power to a transformer, a transistor, and a pulse width modulator (PWM) to oscillate and create a higher voltage signal which is then rectified by a diode to in turn supply a stable high voltage DC power for a DC/AC inverter and a battery in virtue of a cooperative feedback circuit including a Zener diode and a photocoupler, wherein said PWM at high efficiency is capable of permitting omni-range AC input power and isolating the primary AC input power from said battery to avoid electric shock when replacing the latter;

a charger using the high voltage DC power to charge said battery in a manner of limited voltage and current under rated values via a transistor switching circuit and a Zener voltage regulating diode when the civil power is available to ensure a safe and best charge process;

a battery detector being provided with a component voltage rendered by a resistive voltage divider to notify a controller to shut down said battery in time for prolonging lifetime of the latter;

a DC/DC booster utilized to boost the battery voltage in case of civil power failure to supply a high voltage power to a DC/DC inverter via a PWM, a transistor, a transformer, and a rectifying diode;

said DC/AC inverter used to change the DC voltage output of said AC/DC converter or the high-voltage output of said DC/DC booster into a sinewave voltage output via a driver, a power transistor, and an electric inductor;

a ring detector further comprising a capacitor, a bridge rectifier, and a photocoupler used to fetch a ring signal and notify said controller to enable or disable power output; and

said controller composed of some electronic elements or a microcontroller plus a control program to thereby control said DC/DC booster, a power indicating light, and said DC/AC inverter for output of an AC power according to conditions of the power switch, charge quantity of the battery, ring signal, and status of the output power;

wherein said ring detector is ready to detect a ring signal for ON/OFF the output power for power management; and

said AC/DC converter adopts said PWM to effectively isolate the primary AC power from said battery for safe replacement of the latter and permit omni-range AC input power to ensure safe operation.

2. The ON-LINE UPS controllable from far end of claim 1, wherein the AC input power applied to said AC/DC converter is 80V AC˜

240V AC at least or up.