Battery installations. Application area

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Section 4. Switchgears and substations

Battery installations. Application area

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Encyclopedia of radio electronics and electrical engineering / Rules for the installation of electrical installations (PUE)

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4.4.1. This chapter of the Rules applies to stationary installations of acid batteries.

The regulations do not apply to special purpose battery installations.

4.4.2. Battery rooms in which batteries are charged at a voltage of more than 2,3 V per cell are classified as explosive class B-Ia (see also 4.4.29 and 4.4.30).

The premises of rechargeable batteries operating in the mode of constant recharging and charging with a voltage of up to 2,3 V per cell are explosive only during the periods of battery formation and charging after their repair with a voltage of more than 2,3 V per cell. Under normal operating conditions with voltages up to 2,3 V per cell, these rooms are non-explosive.

See other articles Section Rules for the installation of electrical installations (PUE).

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TI DRV2605L vibration motor driver 17.08.2015

Indication of an incoming call using vibration is now implemented in almost every phone. With the widespread use of touchscreen keyboards, an easy way is needed to notify the operator that a key has actually been pressed. One option here is to provide tactile feedback with vibration.

The new DRV2605L IC is an intelligent controller for controlling a small vibration motor or linear resonant actuator (moving core coil). The Immersion TouchSense 2200 library of special effects is already built into the microcircuit, which allows not only to "feel" the touch of a fixed touch button with your fingers, but also to provide full information about the result of the operation using distinguishable vibration effects.

Variable vibration patterns are achieved using the DRV2605L's built-in forced start, forced deceleration, PWM control, and level calibration mechanisms. The microcircuit also monitors the health of the connected actuator by detecting the states "short circuit" and "break". When used with a moving coil actuator, the DRV2605L automatically detects the resonant frequency for maximum control efficiency. DRV2605L assumes control from the microcontroller via the I2C interface and allows direct connection of a vibration motor or a coil with a resistance of more than 4 ohms.

The DRV2605L chip operates on a voltage of 2,5 ... 5,2 V and has its own consumption current of 1,9 μA in standby mode and 2,5 mA at the time of vibration effect playback (without load).

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