On-line UPS controllable from far end

Details On-line UPS controllable from far end On-line UPS controllable from far end

2000-02-17

2001-01-16

Wu, Daniel J. (Department: 2736)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S660000, C363S041000, C363S026000, C363S034000, C307S064000, C307S067000

Reexamination Certificate

active

06175311

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to an uninterrupted power supply (UPS), more particularly, to an improved ON-LINE UPS, which is capable of avoiding electrical shock in replacement of battery when the civil power is under supply and regulating output voltage in spite of changes in input voltage, combined with an appending function of controlling switches from far end by means of detecting ring signal.
2. Description of the Prior Art
An average OFF-LINE UPS is characterized that when the civil power is supplied normally, the output voltage will change subject to change of the input voltage through a relay to probably mangle components in the following stages.
A conventional ON-LINE UPS is to charge a battery through a transformer and a rectifying/charging device or a single rectifying/charging device when the civil power is applied so that the charging voltage of the battery will be varied according to the input rectified voltage to probably mangle the battery and shorten lifetime thereof; and, because the charging circuit is coupled directly with the civil AC power, a user may be electrically shocked when replacing the battery.
Nevertheless, so far, not yet an OFF-LINE or an ON-LINE UPS has been applied in an unmanned relay station for electric power management controllable from far end by availing itself of an existing telecommunication device from which the concept of this invention stems. In view of the demand and after years of constant effort in research, the inventor of this invention has consequently developed and proposed this improved mechanism pertaining to the subject matter.
SUMMARY OF THE INVENTION
The primary object of this invention is to improve the existing UPS for solving the problem of an unmanned relay station for electric power management controllable from far end effectively by a simple way.
Another object of this invention is to improve the existing OFF-LINE UPS to avoid any bad affect on its output power caused by change of its input power.
Yet another object of this invention is to enhance isolation between the AC input power and the battery of the existing ON-LINE UPS.
In order to realize the abovesaid objects, this invention comprises an AC/DC converter, a charger, a battery detector, a DC/DC booster, a DC/AC inverter, a ring detector, and a controller.
The AC/DC converter is used to convert the AC input power into a high-voltage DC power for the DC/AC inverter, wherein a high efficiency PWM is adopted to permit omni-range input power for conversion into a stable output power and isolate the primary AC input power from the battery to avoid electric shock when replacing the battery. The concise circuit of the AC/DC converter is composed of components including U
1
, U
2
, Q
1
, T
1
, D
1
, BD
2
, ZD
1
, ZD
2
, C
2
, C
3
, C
4
, and R
3
.
The charger is a charging circuit used to charge the battery with limited voltage and current without exceeding rated values when the civil power is available. The main components of the charging circuit include ZD
3
, Q
2
, R
4
, and R
5
.
The battery detector is used to detect the battery voltage and transmit the measured data to the controller for shutting down the battery's power in order not to over-discharge. The main components of the voltage detector include R
8
, R
9
, and U
6
.
The DC/DC booster is supposed to boost the battery voltage in case of civil power failure, and the components included are U
2
, Q
3
, T
2
, D
2
, C
5
, R
6
, and R
7
.
The DC/AC inverter is used to change the DC voltage output of the AC/DC converter or the high-voltage output of the DC/DC booster into a sine-wave voltage output, and the components included are U
4
, US, Q
4
, Q
5
, Q
6
, Q
7
, L
1
, and C
6
.
The ring detector is used to fetch an alternating ring signal from a capacitor. The ring signal then undergoes a bridge rectifier to produce a DC voltage that is applied to an LED of a photocoupler in forward direction with a resister combined in series for current limitation of the LED. When the LED is lightened, a transistor in an opposite position inside the photocoupler is conducted and the voltage of the output ring signal would approach zero, and on the contrary, when the transistor is open, the voltage of the output ring signal is equal to +Vcc. When ringing, as the DC voltage difference between the phone lines is hindered by an interpolated capacitor, the ring detector containing CN
1
, BD
1
, U
3
, C
1
, R
1
, and R
2
will not be intervened by any other alternating signal.
The controller is composed of some electronic elements or a microcontroller plus a control program to thereby control the DC/DC booster and the DC/AC inverter for output of an AC power depending on conditions of the power switch, charge quantity of the battery, ring signal, and status of the output power.
The abovesaid well isolated ON-LINE UPS controllable from far end can ensure safety in replacing the battery and in omni-range AC power input.


REFERENCES:
patent: 4860185 (1989-08-01), Brewer et al.
patent: 4876460 (1989-10-01), Johnson
patent: 5465011 (1995-11-01), Miller et al.
patent: 5612581 (1997-03-01), Kageyama
patent: 5619077 (1997-04-01), Green et al.
patent: 5896282 (1999-04-01), Wu

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