KR20170112232A - fail-safe discharge control using SCR - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a discharge maintenance of an uninterruptible power supply (UPS), and more particularly, to a discharge maintenance of an uninterruptible power supply (UPS) , The current detection diode measures the current of the diode with the current detection sensor. When the current flows, the current detection signal is transmitted to the gate of the SCR (silicon rectifier) to conduct the SCR (silicon rectifier) Or the temperature of the diode is measured by the temperature sensor. When the temperature rises, it is judged that the current flows and the current detection signal is transmitted to the gate of the SCR (silicon rectifier), and the SCR To a conductive state to maintain a discharge in a discharge condition without power loss.

Description

Fail-safe discharge control using a silicon rectifier (SCR) {SCR}

The present invention relates to discharge control of an uninterruptible power supply (UPS) including a control unit. More particularly, the present invention relates to a battery management system (BMS) for controlling the operation of a battery of an uninterruptible power supply (UPS), and more particularly, to an apparatus and a method for controlling a main switch from a battery to an inverter when a commercial power source is abnormal.

Generally, an uninterruptible power supply (UPS) is a device for supplying power to a server device or a communication device which is always powered. Generally, a battery is installed in such an uninterruptible power supply (UPS), and the battery is charged by a power source applied during normal operation. In case of a power failure or an emergency, Power Supply: UPS) will operate stably.

An uninterruptible power supply (UPS), which is used to prevent the interruption of the power supply to the load when an abnormality occurs in the input power source, is a DC power source such as a battery or a capacitor, It is used to shut off the input side to prevent the regulated AC power obtained by operating the DC-AC converter inverter from flowing back to the input side. Generally, the battery, converter, inverter, , A switch (Static Switch), and a bypass switch (Maintenance Bypass Switch).

The battery supplies DC power to the inverter when AC input power is out of order.

The converter converts the AC input power to DC and supplies DC power to the battery or inverter, which is also called a rectifier / charger.

The inverter receives the DC power from the converter or the battery and converts it to the AC power of the constant voltage and the constant frequency and supplies it to the load. In general, the transformer, the filter and the combination .

The switching switch (Static Switch) switches the load to the alternate power source in order to prevent malfunction and shutdown of the load in case of inverter trouble.

The Bypass Switch (Maintenance Bypass Switch) is used to supply power to the load during repair or maintenance work due to UPS trouble.

In case of power failure of AC input power source, the battery management system (BMS) recognizes the AC input power supplied to the converter during power outage, so that the power of the inverter is discharged to the battery Which is supplied from the battery and supplies a stable power to the load in a steady state.

In this case, the battery management system (BMS) recognizes the power failure and activates a switch for connecting the inverter to the battery.

1 schematically shows a configuration diagram illustrating an operation of an uninterruptible power supply (UPS) 100 according to the prior art.

Referring to this drawing, an uninterruptible power supply (UPS) is installed in a battery 200 and includes a battery management system (BMS) (not shown) for controlling the operation of the battery 200 And a charge controller 110 connected to a rectifier 10 for converting a commercial power source into a direct current and for preventing overcharging while the commercial power source charges the battery 200 with the power output from the rectifier 10, .

The charge control unit 110 includes a main relay 120 for interrupting the electrical connection between the rectifier and the battery 200 and a main relay 120 for discharging the power of the battery 200 even in the event of a power failure or an emergency. And a discharge diode 130 connected in parallel with the discharge diode 120.

When the commercial power source is charged and reaches the upper limit power set on the basis of the battery 200, the charge control unit 110 turns off the main relay 120 to be supplied to the battery 200 The power source is cut off to prevent the battery 200 from being overcharged. At this time, the diode 130 connected in parallel to the main relay 120 can discharge the power of the battery 200 during a power failure or an emergency, thereby performing a role as the uninterruptible power supply (UPS) 100 can do.

However, when the power of the battery 200 is discharged by the diode 130 during a power outage or an emergency, the power consumed by the diode is not small, so that loss of power can not be prevented and a large amount of heat There is a problem that additional defects may occur.

Therefore, when the power of the battery 200 is discharged, the main relay 120 is turned on in the battery management system (BMS), and the main relay 120 is turned on, It is necessary to prevent the loss of electric power by discharging the power source and eliminate the occurrence of additional defects due to the generation of a large amount of heat.

Also, when the main relay 120 is controlled by the battery management system BMS to discharge the power of the battery 200, the battery management system BMS can not control the main relay 120 Problems can also occur.

The present invention recognizes that a battery management system (BMS) abnormally detects an input power abnormality, a power failure, or an emergency when an abnormality occurs in an input power source of a conventional uninterruptible power supply (UPS) When the main switch can not be controlled to supply stable power to the inverter and power is supplied to the inverter through the diode even when the main switch fails due to a failure of the main switch, And a main purpose is to supply power from the battery to the inverter in a stable manner by preventing a loss which may occur due to a large amount of heat generated in the diode, thereby preventing additional defects.

It is an uninterruptible power supply (UPS) to prevent the interruption of power supply from the battery to the inverter when the input power is out of order. It is located between the battery and the inverter, A battery management system (BMS) that can control the opening and closing of the main switch, a battery management system (BMS) that can control the opening and closing of the main switch, An anode connected to an input terminal of the diode and a cathode connected to an output terminal of the diode, and a cathode connected to an output terminal of the diode, And an SCR (silicon rectifier) connected to an output terminal of the control unit and having a gate connected to the control unit .

When the input power is in a normal state, the main switch receives a normal signal from the battery management system (BMS) and maintains an off state, thereby preventing discharge from a battery to an inverter, And receives an abnormal signal from the battery management system (BMS) when an abnormality occurs in the power source, and maintains the on state to maintain the discharge from the battery to the inverter.

The diode may not be able to control the main switch due to an abnormality of the main management switch (BMS) due to an abnormality of the main power switch when an abnormality occurs in the input power source, Even if the main switch is not operated, current flows and is connected in parallel to the main switch so as not to interrupt power supply from the battery to the inverter, thereby forming a current path between the battery and the inverter .

The main control unit may not be able to control the main switch due to an abnormality of the main control unit (BMS) abnormality due to an abnormality in the input power source, And a current sensing sensor for sensing that current flows through the diode connected to the main switch in parallel when the main switch is not operated.

The current sensor inputs a gate-current to a gate of the silicon rectifier when the current of the diode is measured.

The main control unit may not be able to control the main switch due to an abnormality of the main control unit (BMS) abnormality due to an abnormality in the input power source, And a temperature sensor for sensing that the diode operates and the temperature rises when the main switch is not operated.

When the temperature of the diode rises to be equal to or higher than a preset temperature value, the temperature sensor determines that a current flows through the diode and inputs a gate-current to the gate of the silicon rectifier (SCR) .

The battery management system (BMS) discharges and interrupts when an abnormality occurs in the input power of the conventional uninterruptible power supply (UPS) according to the present invention, or when the battery management system (BMS) When the main switch 100 can not be controlled in order to supply stable power from the battery to the inverter in recognition of an emergency, the main switch is not operated due to a failure of the main switch, and the power is supplied to the inverter using a diode It is possible to prevent a loss of electric power consumed by the diode and to prevent a defect that may be additionally generated due to a large amount of heat generated in the diode

That is, when the input power source abnormality occurs, the battery management system (BMS) must maintain the discharge by discharging and power failure or the emergency management, and when the battery management system (BMS) fails to control the main switch, And the temperature of the diode is measured, and the discharge can be maintained without power loss by using the SCR (silicon rectifier).

On the other hand, even if the effects are not explicitly mentioned here, the effect described in the following specification, which is expected by the technical features of the present invention, and its potential effects are treated as described in the specification of the present invention.

1 is a diagram illustrating an example of a conventional fail-safe device for maintaining discharge and power failure or emergency discharge.
FIG. 2 is a diagram illustrating a fail-safe control apparatus using a silicon rectifier (SCR) 300 to maintain a discharge and a discharge or an emergency discharge according to a preferred embodiment of the present invention.
* The accompanying drawings illustrate examples of the present invention in order to facilitate understanding of the technical idea of the present invention, and thus the scope of the present invention is not limited thereto.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" to another part, it includes not only "directly connected" but also "electrically connected" with another part in between . Also, when an element is referred to as " comprising ", it means that it can include other elements as well, without departing from the other elements unless specifically stated otherwise. The word " step (or step) " or " step " used to the extent that it is used throughout the specification does not mean " step for.

The present invention is based on the recognition that a battery management system (BMS) 300 discharges, interrupts, or emerges when an input power source of an uninterruptible power supply (UPS) It is necessary to control the main switch 310 to be on so that the power supply from the battery to the inverter can be maintained so as to supply stable power from the battery to the inverter, If the main switch 310 can not be controlled by the BMS 300 or if the main switch 310 fails to operate due to a failure of the main switch 310, When power is supplied from a battery to an inverter through a diode 320 connected in parallel to the main switch 310, 320 or a temperature is measured to input a gate-current to the gate of the SCR (silicon rectifier) 400 to drive the inverter from the battery without going through the diode 320. [ The power is supplied to the inverter to maintain the discharge.

2, when the input power is in a normal state, the battery management system (BMS) 300 transmits a normal signal to the main switch 310 so that the main switch 310 is turned off, State. On the other hand, when an abnormality occurs in the input power, the battery management system (BMS) 300 sends an abnormal signal to the main switch 310 to turn on the main switch 310 And the electric power is supplied from the battery to the inverter to maintain the discharge.

However, if the abnormal state of the battery management system (BMS) 300 fails to transmit an abnormal signal to the main switch 310 and the on / off control of the main switch 310 can not be performed, And then flows from the battery to the inverter through the diode 320 connected in parallel to the main switch 310.

Also, even when the battery management system (BMS) 300 fails to transmit an abnormal signal to the main switch 310 during a power outage or an emergency, the current flows from the battery through the diode connected to the main switch 310 in parallel (320) to the inverter.

Also, even if the main switch 310 is not operated due to a failure of the main switch 310, the battery management system (BMS) 300 transmits an abnormal signal to the main switch 310, And flows to an inverter through a diode 320 connected in parallel to the main switch 310 in a battery.

When a current flows through the diode 320, the controller 410 senses the current and inputs a gate-current to the gate of the silicon rectifier 400 to supply the gate-current from the battery to the inverter Inverter) to keep the discharge.

As shown in FIG. 2, in the first embodiment of the present invention, when an abnormality occurs in the input power source, an abnormal signal can not be transmitted to the main switch 310 from the battery management system (BMS) 300, When the main switch 310 is not operated due to a failure of the main switch 310 or when a current flows to the diode 320 in an emergency, the controller 410 senses the current of the diode 320 And a current sensing sensor.

The current sensing sensor may include a current sensor corresponding to at least one of a current transformer method, a Hall element method, and a fuse method. Here, the current sensor may mean a sensor for measuring the amount of current flowing in the alternating current and the direct current.

The battery management system (BMS) 300 is required to maintain the discharge by transmitting an abnormal signal to the main switch 310 when the input power is abnormally generated. However, the battery management system (BMS) When the main switch 310 can not be turned on due to the failure to transmit the abnormal signal to the main switch 310, the current flows from the battery through the diode 320 connected in parallel with the main switch 310 And flows to the inverter.

The current sensor of the controller 410 may measure the current flowing to the diode 320. [ When the current of the diode 320 is measured in the current sensor, a gate-current is input to the gate of the SCR (silicon rectifier).

When a gate-current is inputted from the current sensing sensor, the SCR (silicon rectifier) 400 is turned into a conductive state, And the current flowing to the diode 320 is cut off due to the intrinsic resistance of the diode 320.

Also, even when the battery management system (BMS) 300 fails to transmit an abnormal signal to the main switch 310 during a power outage or an emergency, the current flows from the battery through the diode connected to the main switch 310 in parallel (320) to the inverter.

The current sensor of the controller 410 may measure the current flowing to the diode 320. [ When the current of the diode 320 is measured in the current sensor, a gate-current is input to the gate of the SCR (silicon rectifier).

When a gate-current is inputted from the current sensing sensor, the SCR (silicon rectifier) 400 is turned into a conductive state, And the current flowing to the diode 320 is cut off due to the intrinsic resistance of the diode 320.

Also, even if the main switch 310 is not operated due to a failure of the main switch 310, the battery management system (BMS) 300 transmits an abnormal signal to the main switch 310, And flows to an inverter through a diode 320 connected in parallel to the main switch 310 in a battery.

The current sensor of the controller 410 may measure the current flowing to the diode 320. [ When the current of the diode 320 is measured in the current sensor, a gate-current is input to the gate of the SCR (silicon rectifier).

When a gate-current is inputted from the current sensing sensor, the SCR (silicon rectifier) 400 is turned into a conductive state, And the current flowing to the diode 320 is cut off due to the intrinsic resistance of the diode 320.

As shown in FIG. 2, in the second embodiment of the present invention, when an abnormality occurs in the input power source, an abnormal signal can not be transmitted to the main switch 310 from the battery management system (BMS) 300, When the main switch 310 is not operated due to a failure of the main switch 310 or when an electric current flows to the diode 320 in an emergency, the controller 410 operates the diode 320, And a temperature sensor for detecting the rising of the temperature.

The temperature sensor may be various devices capable of calculating the temperature by changing the resistance according to the temperature change. For example, the temperature measuring device may be an NTC thermistor (Negative Temperature Coefficient Thermistor). The temperature sensor is thermally interconnected with the diode 320.

The BMS 300 must transmit an abnormal signal to the main switch 310 when an abnormality occurs in the input power source but the battery management system BMS 300 may transmit an abnormal signal to the main switch 310 If the main switch 310 can not be turned on due to the abnormal signal transmission, the current is supplied from the battery to the inverter through the diode 320 connected in parallel with the main switch 310, Lt; / RTI >

When a current flows through the diode 320, the temperature of the diode 320 rises. The temperature sensor of the controller 410 measures the temperature of the diode 320 and determines that a current flows in the diode 320 when the measured value is equal to or higher than a preset temperature value, It is input to the gate of the SCR (silicon rectifier).

When the gate-current is inputted from the temperature sensor, the SCR (silicon rectifier) 400 is turned into a conductive state, and the SCR (silicon rectifier) 400 is turned on to supply power from the battery to the inverter. The current is supplied to maintain the discharge and the current flowing to the diode 320 is cut off due to the inherent resistance of the diode 320.

Also, even when the battery management system (BMS) 300 fails to transmit an abnormal signal to the main switch 310 during a power outage or an emergency, the current flows from the battery through the diode connected to the main switch 310 in parallel (320) to the inverter.

When a current flows through the diode 320, the temperature of the diode 320 rises. The temperature sensor of the controller 410 measures the temperature of the diode 320 and determines that a current flows in the diode 320 when the measured value is equal to or higher than a preset temperature value, It is input to the gate of the SCR (silicon rectifier).

When a gate-current is input from the temperature sensor, the SCR (silicon rectifier) 400 is turned into a conductive state, Inverter, power is supplied to maintain the discharge, and the current flowing to the diode 320 is cut off due to the inherent resistance of the diode 320.

Even when the main switch 310 is not operated due to a failure of the main switch 310, the current is transmitted from the battery management system (BMS) 300 to the main switch 310, And flows to an inverter through a diode 320 connected in parallel to the main switch 310 in a battery.

When a current flows through the diode 320, the temperature of the diode 320 rises. The temperature sensor of the detection unit 220 of the control unit 410 measures the temperature of the diode 320 and determines that a current flows in the diode 320 when the measured value is equal to or higher than a predetermined temperature value, -current) to the gate of the SCR (silicon rectification element).

When a gate-current is input from the temperature sensor, the SCR (silicon rectifier) 400 is turned into a conductive state, Inverter, power is supplied to maintain the discharge, and the current flowing to the diode 320 is cut off due to the inherent resistance of the diode 320.

The scope of protection of the present invention is not limited to the description and the expression of the embodiments explicitly described in the foregoing. It is again to be understood that the present invention is not limited by the modifications or substitutions that are obvious to those skilled in the art.

10 rectifier
100 Uninterruptible Power Supply (UPS)
110 charge control unit
120, 320 diodes
130 Main relay
200 Battery
300 Battery Management System (BMS)
310 main switch
400 SCR (silicon rectifier)
410 control unit

Claims (7)

Uninterruptible power supply (UPS) to prevent interruption of power supply from battery to inverter when an input power failure occurs.
A main switch which is located between a battery and an inverter and opens or closes a circuit between the battery and the inverter to maintain or interrupt the discharge;
A battery management system (BMS) capable of controlling opening and closing of the main switch;
A diode connected in parallel to the main switch so as to maintain the discharge without interruption of power supply from the battery to the inverter even in a power failure or an emergency;
A control unit connected to an output terminal of the diode; And
An SCR (silicon rectifier) having an anode connected to an input terminal of the diode, a cathode connected to an output terminal of the control unit, and a gate connected to the control unit;
And a fail-safe control device using a silicon rectifier (SCR).
The method according to claim 1,
Wherein the main switch comprises:
When the input power is in a normal state, receives a normal signal from the battery management system (BMS) and maintains the off state to prevent the battery from discharging from the battery to the inverter,
When an abnormality occurs in the input power source, an abnormality signal is received from the battery management system (BMS), and the on state is maintained to maintain the discharge from the battery to the inverter,
A fail-safe control device using a silicon rectifier (SCR).
The method according to claim 1,
The diode comprising:
When an abnormality occurs in the input power source, the main switch can not be controlled due to an abnormality of the main control unit (BMS) due to an abnormality of the battery management system (BMS), or in case of a power failure or an emergency, A current path is formed between the battery and the inverter in parallel with the main switch so as not to interrupt supply of power from the battery to the inverter even when the battery is not operated;
A fail-safe control device using a silicon rectifier (SCR).
The method according to claim 1,
Wherein the control unit comprises:
When an abnormality occurs in the input power source, the main switch can not be controlled due to an abnormality of the main control unit (BMS) due to an abnormality of the battery management system (BMS), or in case of a power failure or an emergency, If not,
A current sensor connected to the main switch in parallel to sense a current flowing through the diode;
And a fail-safe control device using a silicon rectifier (SCR).
5. The method of claim 4,
Wherein the current sensor comprises:
When the current of the diode is measured,
Gate-current is input to the gate of the SCR (silicon rectifier), and a fail-safe control device using SCR (silicon rectifier) is used.
The method according to claim 1,
Wherein,
When an abnormality occurs in the input power source, the main switch can not be controlled due to an abnormality of the main control unit (BMS) due to an abnormality of the battery management system (BMS), or in case of a power failure or an emergency, If not,
And a temperature sensor for sensing a temperature rise of the diode when the diode operates.
The method according to claim 6,
Wherein the temperature sensor comprises:
When the temperature of the diode rises and is equal to or higher than a preset temperature value,
And a Gate-current is inputted to the gate of the SCR (silicon rectifier) by judging that a current flows in the diode, and fail-safe using SCR (silicon rectifier).

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