KR100383724B1 - An automatical power supply switching apparatus - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic voltage converting device which automatically adjusts an output voltage when starting an inductive load and automatically switches off an output voltage of a voltage supply device when an overload condition is eliminated when an overload occurs. The purpose is to.

The present invention for achieving the above object is an operating voltage generation unit 10 for generating a power relay voltage, a relay voltage and a circuit voltage, a phase current detector 80 for detecting a phase current and a neutral current change installed on a load line; Neutral current detector 90, First and second detection current output units 20 and 30 for rectifying and smoothing the detected currents of the phase current detector and the neutral current detector, respectively, and the first and second detection current output units. A control IC 40 that receives the output, delays and compares the result, and generates a relay drive control logic signal; a delay unit 45 that determines an output delay time value of the control IC; and a reset circuit for resetting the control IC. A reset unit 50 including a reset switch 51, a power relay driving contact for delay supply of inductive load driving voltage, a contact for blocking the general load 102, and a buzzer 103 according to the output of the control IC. Foot contact for driving A relay unit 60 including a plurality of transistors 61-64 for producing and a relay 65-68 controlled by these transistors, and a relay 65 for inductive load driving voltage delay supply of the relay unit; And an inductive load power supply unit 70, 70 'including a power relay and a power transformer for activating the inductive loads 100 and 101, respectively, in response to the contacts of 66).

Such an apparatus of the present invention facilitates the starting of inductive loads, and in case of overload, temporarily shuts off the load voltage supply and then alarms and automatically recovers when the overload condition is eliminated. It has the effect of preventing damage and preventing the possibility of fire.

Description

Automatic voltage converter {An automatical power supply switching apparatus}

The present invention provides an automatic voltage converter which automatically adjusts the output voltage at the start of an inductive load and automatically switches off the load voltage supply simultaneously with the operation of the alarm buzzer until the overload condition is eliminated when an overload occurs. It is about.

In general, when the inductive load is started, a current larger than the holding current after driving thereof is required. Therefore, at start-up, a supply of a current larger than the drive current is required at a voltage lower than the drive voltage. Since a control circuit for satisfying this is not provided separately in a general load voltage supply device, the start voltage supplied to an inductive load Since the drive holding voltage is the same after starting, the power utilization efficiency cannot be adequately achieved.

On the other hand, in the general consumer side, an additional load is excessively connected to the power supply line in excess of the capacity of the voltage supply transformer, resulting in damage to the voltage supply device due to overload or fire.

Therefore, it has been desired to add an automatic voltage converter and an overload automatic detection and blocking device capable of supplying a driving voltage to an inductive load with an appropriate temporal voltage and current conversion program.

SUMMARY OF THE INVENTION An object of the present invention is to provide an automatic voltage conversion device in which an adjustment of an output voltage conversion is automatically performed at a predetermined time interval when an inductive load is started.

Another object of the present invention is to automatically switch off the output voltage of the voltage supply device when the overload condition is eliminated when the overload condition is eliminated by inserting an additional load beyond the transformer capacity on the load voltage supply line. To provide a device.

1 is a circuit configuration diagram of the apparatus of the present invention.

<Description of the symbols for the main parts of the drawings>

10: operation voltage generator 11: bridge diode

12, 13: constant voltage IC 20, 30: detection current output unit

21-24,31-34: Diodes 25,26,35,36,47: Condenser

28,29,38,39,46,48,52: Resistance 40: Control IC

45: delay unit 50: reset unit

51: reset switch 60: relay unit

61-64: Transistor 65-68: Relay

70.70 ': Inductive load power supply 71: Power transformer

72: power relay 80: phase current detector

90: neutral current detector 100-102: load

103: buzzer

The present invention for achieving the above object is an operating voltage generating unit for generating a power relay voltage, a relay voltage and a circuit voltage, a phase current detector and a neutral current detector for detecting a phase current and a neutral current change installed on a load line, Relay drive control logic signal by receiving and delaying and comparing the first and second detection current output units for rectifying and smoothing the detection currents of the phase current detector and the neutral current detector, respectively, and outputting the first and second detection current output units. A reset unit including a control IC for generating a signal, a delay unit for determining an output delay time value of the control IC, a reset switch for resetting the control IC, and an inductive along the output of the control IC. A plurality of transistors for generating a power relay driving contact for load supply voltage delay supply, a contact point for a general part and a blocking contact, and a buzzer driving contact And a relay unit including relays controlled by these transistors, and a power relay and a power transformer for activating the inductive load, respectively, by receiving contacts of the relay unit for inductive load driving voltage delay supply. It characterized in that it comprises a load power supply.

Hereinafter, the present invention will be described with reference to the accompanying drawings.

1 is a circuit configuration diagram of the apparatus of the present invention. As referred to herein, the automatic voltage converting apparatus of the present invention detects a change in phase current and neutral current installed on a load line, and an operating voltage generator 10 for generating a power relay voltage, a relay voltage, and a circuit voltage. A phase current detector 80 and a neutral current detector 90, first and second detection current output units 20 and 30 for rectifying and smoothing and outputting detection currents of the phase current detector and the neutral current detector, respectively, and the first And a control IC 40 which receives the output of the 2 detection current output unit, delays and compares the result, and generates a relay drive control logic signal, a delay unit 45 that determines an output delay time value of the control IC, and the control. A reset unit 50 for resetting the IC, a relay unit 60 for generating a plurality of load and buzzer control contacts according to the output of the control IC, and an inductive load power supply unit operating as a contact point of the relay unit ( 70,7 0 ').

The operating voltage generator 10 includes a bridge diode 11 rectifying an AC input, a plurality of smoothing capacitors, and first and second constant voltage ICs 12 and 13 maintaining a predetermined constant voltage output, which is a power relay. The driving voltage 30V, the relay driving voltage 12V and the circuit operating voltages 5V and Vcc are respectively output.

The first detection current output unit 20 includes diodes 21-24, a smoothing capacitor 25, resistors 27, 28, and a capacitor 26 for rectifying the signal detected by the phase current detector 80. do.

The second detection current output unit 30 includes a diode 31-34, a smoothing capacitor 35, a resistor 37, 38, and a capacitor 36 for rectifying the signal detected by the neutral current detector 90. Include.

The delay unit 45 includes resistors 46 and 48 and a capacitor 47 to determine the relay control output delay time in the control IC 40.

The reset unit 50 includes a reset switch 51 for resetting the control IC 40.

The relay unit 60 includes a plurality of transistors 61-64 which drive in accordance with the control output logic of the control IC 40, and a plurality of relays 65-68 which drive by these transistors, respectively.

The inductive load power supply unit 70 is a power relay 72 to be driven by the contact output of the relay unit, and a power transformer 71 to switch the voltage supplied to the load 100 side by the contact of the power relay It includes. The inductive load power supply 70 'also has the same circuit configuration as the inductive load power supply 70.

Referring to the operation of the present invention configured as described above is as follows.

When the load power switch is turned on to start the inductive load 100, the current supplied to the load changes rapidly, and the current change is detected by the phase current detector 80 installed on the current supply line. The detection current is input to the port PAO of the control IC 40 through the detection current output unit 20.

The control IC 40 makes the logic output of the port PB7 high for a delay time set by the delay unit 45 when a phase current change signal is input to its port PAO. As a result, the relay 65 of the relay unit 60 is turned on and the contact thereof turns on the power relay 72 of the inductive load power supply unit 70 by turning on the relay.

The driving of the power relay 72 switches its contacts to change the output voltage of the power transformer 71 supplied to the load 100 side.

Subsequently, after the delay time determined by the load start time in the delay unit 45 has elapsed, the logic output value of the port PB7 of the control IC 40 goes low, and thus the power relay 72 is turned off. The voltage supplied to 100 is supplied with the normal input voltage through the power transformer.

On the other hand, if the transformer is overloaded by the insertion of an additional load in the normal load driving state, the current change is detected in the neutral current detector 90.

This sensing current is input to the control IC 40 through the respective current detectors 20 and 30 together with the output of the phase current detector 70 to determine the overcurrent state according to the overload condition.

When the overload condition is determined by the control IC 40, a logic signal of high level is output from the ports PB4, PB5, and PB6, respectively, thereby driving the relays 66-68 of the relay unit 60. The LED is driven.

The driving of the relay 66 causes the load 101 to be switched off through another inductive load power supply 70 ', and the AC supply of the AC voltage supplied to the load 102 by the relay 67 is provided. It is to be cut off, the buzzer 103 is driven by the relay 68 to alert the administrator of the load interruption and overload conditions.

When this overload condition is restored, the control IC 40 switches the logic level of its output port to normalize the voltage supply supplied to the load. In addition, the control IC can be reset by operating the reset switch 51 of the reset unit 50.

Such an apparatus of the present invention prevents an overload condition during startup by dually supplying a starting voltage and a load driving holding voltage when starting an inductive load, and in case of overload, temporarily shuts off the load voltage supply and then alarms and overloads. By automatically recovering when the condition is eliminated, it is possible to prevent damage to the voltage supply due to the continued overload condition and to prevent the possibility of a fire in advance.

Claims (1)

An operating voltage generator 10 for generating a power relay voltage, a relay voltage and a circuit voltage, a phase current detector 80 and a neutral current detector 90 for detecting a phase current and a neutral current change installed on a load line, and the phase current. The first and second detection current output units 20 and 30 for rectifying and smoothing the detection currents of the detector and the neutral current detector, respectively, and the outputs of the first and second detection current output units are delayed and compared. A control IC 40 for generating a relay drive control logic signal, a delay unit 45 for determining an output delay time value of the control IC, and a reset switch 51 for resetting the control IC; According to the reset unit 50 and the output of the control IC, a power relay driving contact for delay supply of inductive load driving voltage, a contact for disconnecting the general load 102 and a contact for driving the buzzer 103 are respectively generated. Multiple Transistors (61-64) And a relay unit 60 including relays 65-68 respectively controlled by these transistors, and inductive loads 100 and 101 in contact with the inductive load driving voltage delay supply relays 65 and 66. And an inductive load power supply unit (70, 70 ') including a power relay and a power transformer for activating the respective ones.