IEC 62969-3:2018 pdf download

IEC 62969-3:2018 pdf download.Semiconductor devices – Semiconductor interface for automotive vehicles – Part 3: Shock driven piezoelectric energy harvesting for automotive vehicle sensors
1 Scope
This part of IEC 62969 describes terms, definitions, symbols, configurations, and test methods that can be used to evaluate and determine the performance characteristics of mechanical shock driven piezoelectric energy harvesting devices for automotive vehicle sensor applications. This document is also applicable to energy harvesting devices for motorbikes, automobiles, buses, trucks and their respective engineering subsystems applications without any limitations of device technology and size.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60749-5, Semiconductor devices – Mechanical and climatic test methods – Part 5: Steady-state temperature humidity bias life test IEC 60749-1 0, Semiconductor devices – Mechanical and climatic test methods – Part 10: Mechanical shock IEC 60749-1 2, Semiconductor devices – Mechanical and climatic test methods – Part 12: Vibration, variable frequency IEC 62830-1 , Semiconductor devices – Semiconductor devices for energy harvesting and generation – Part 1: Vibration based piezoelectric energy harvesting
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62830-1 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at http://www.iso.org/obp 3.1 General terms 3.1.1 shock sudden acceleration or deceleration resulting in transient physical excitation; characterized by the peak acceleration, the duration, and the shape of the shock pulse (rectangular, half-sine, sawtooth, etc.) Note 1 to entry: The fundamental frequency of the automotive vehicle shock is varied from 0,5 Hz to 20 Hz. Note 2 to entry: Mechanical shock pulses are sinusoidal, rectangular, half-sine, sawtooth, etc. waves. Detailed explanation of mechanical shock pulses with an analysis of shock amplitude and duration/frequency of automobile and conventional shaker have been included in Annex A (informative). 3.1.2 shock driven energy harvester generator that responds to the applied mechanical shock, transforms shock into vibration (mechanical oscillation), and converts the vibration to the electricity Note 1 to entry: The generated power depends on the characteristics of applied shock and, mechanical and electrical characteristics of the generator itself. Note 2 to entry: Shock energy harvester to convert shock to electricity by using piezoelectric transducers is comprised of inertial mass, spring, and piezoelectric transducer as shown in Figure 1 . The piezoelectric transducer contains two electrodes and a piezoelectric film. Vibration is induced in response to the applied shock that introduces a reciprocating motion to the mass. The spring which suspends the mass is bended and the bending of spring introduces tensile and compression of piezoelectric film. The top and bottom electrodes of piezoelectric film harvest generated charges from the piezoelectric effect. Note 3 to entry: Shock driven energy harvester is represented as shown in Figure 2. It is configured by mass, spring, damping, and piezoelectric transducer. The piezoelectric transducer is generally viewed as damping.3.2 Piezoelectric transducer 3.2.1 piezoelectric effect phenomenon in which a mechanical deformation produces an electric polarization of piezoelectric material, and conversely an electric polarization produces a mechanical deformation [SOURCE: IEC 60050-1 21 :1 998, 1 21 -1 2-86, modified] 3.2.2 piezoelectric charge constant d ij polarization generated per unit of mechanical stress applied to a piezoelectric material Note 1 to entry: The first subscript to d indicates the direction of polarization generated in the material when the electric field, is zero or, alternatively, is the direction of the applied field strength. The second subscript is the direction of the applied stress or the induced strain, respectively. d 33 : induced strain in direction Z-axis per unit electric field applied in direction Z-axis. d 31 : induced strain in direction X-axis per unit electric field applied in direction Z-axis. 3.2.3 electromechanical coupling coefficient k value to describe the conversion rate of electrical energy to mechanical form or vice versa