Details, datasheet, quote on part number: M54125
PartM54125
CategoryAnalog & Mixed-Signal Processing => Power
TitlePower
DescriptionEarth Leakage Current Detector
CompanyMitsubishi Electronics America, Inc.
DatasheetDownload M54125 datasheet
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Features, Applications

DESCRIPTION

The is a semiconductor integrated circuit consisting of an amplifier for high-speed earth leakage circuit breaker.

FEATURES

q Satisfies JIS 8371 q Temperature-stable input current trigger threshold (VLKT 9mV) q Capable of detecting a lost phase on the neutral line q Economical, low external component count q Highly resistant to noise and power surges q Wide operating temperature range (Ta +80C)

APPLICATION

The is a semiconductor integrated circuit for use in the amplifier section of earth-leakage circuit breakers. It consists of a differential amplifier, one-shot circuit, output circuit, current regulator, waveform regulator and delay circuit. The following description refers to the block diagram, application example, and operational waveforms.

Bias current source Voltage regulator Comparator VBLT
EARTH LEAKAGE CURRENT DETECTOR ABSOLUTE MAXIMUM RATINGS (Ta 80C unless otherwise noted)

Symbol IS IS(SO) VILK VIBL VOUT Pd Topr Tstg Parameter Supply voltage Supply surge current ILK input voltage IBL input voltage OUT applied voltage Power dissipation Operating temperature Storage temperature Conditions Average supply current frequency per cycle (Note 1) Pin VB serves as the voltage reference When external voltage is applied Ratings Unit mW C

Note 1: IS(SG) current waveform, which is given in the following diagram, shall be one shot or less per minute.

RECOMMENDED OPERATING CONDITIONS (Ta 80C unless otherwise noted)

Symbol VS IS CMM CWF CTD RX Supply voltage Supply current External capacitor MM External capacitor WF External capacitor TD External resistor RX Parameter When output OUT is OFF Average power supply current per cycle Min. 12 Limits Typ. Max. Unit F k

Handling of unused pins when the abnormal voltage detection function is not used Pin RX must be left open Pin TD must be shorted to GND Pin WF and pin IBL may be left open or shorted to GND

When leakage current Ig appears on the primary side of zero-current transformer, ZCT, leakage signal voltage V ILK appears on the secondary side and is input at ILK with bias VB as the reference. In the half cycle when VILK is negative, capacitor CMM connected to MM charges until VILK reaches the DC trip voltage. If the voltage at MM does not reach the MM positive threshold voltage, when the charging phase is completed, capacitor CMM discharges at a small current. The output OUT is reset to the off state (in which output current flows in) when VMM descends to the MM negative threshold voltage. Earth-leakage currents are detected when the amplitude of input voltage VILK exceeds the DC trip voltage VLKT for longer than the detection time tMM. The output OUT turns on for time tOUT. The output current is used to turn on the thyristor that opens the breaker contacts.

Normally VIBL, fixed amplitude AC supply that has been rectified and divided by a resistor, is input to abnormal voltage input IBL. When a fault occurs in the neutral line N, successive peaks of VIBL become alternately small and large, with the levels determined by the load on the AC power lines A and B. When the amplitude of VIBL exceeds the abnormal voltage trip voltage VBLT, capacitor CWF connected to pin WF discharges. After the discharge shase is completed, charging begins again.) When voltage VWF at WF drops below the WF threshold voltage, capacitor CTD at TD charges, and after delay time tTD, when voltage VTD at TD reaches the TD threshold voltage, output OUT turns on, activating the circuit breaker. To avoid misoperation due to the effect of repeated one-shot noise that brings VIBL above VBLT, the voltage drops to the initial value only after time tWF. This abnormal voltage detection circuit is enabled only when an external resistor RX is connected to pin RX to enable the current flow.

1) Voltage waveform when earth leakage is detected. VILK ILK VB
2) Voltage waveform when abnormal voltage is detected. VISL Noise VBTL(3.9V)

 

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