Файл: wirelesspowerspecificationpart1.pdf

1.6Conventions

This Section 1.6 defines the notations and conventions used in this System Description Wireless Power Transfer.

1.6.1Cross references

Unless indicated otherwise, cross references to Sections in either this document or documents listed in Section 1.2, refer to the referenced Section as well as the sub Sections contained therein.

1.6.2Informative text

With the exception of Sections that are marked as informative, all informative text is set in italics.

1.6.3Terms in capitals

All terms that start with a capital are defined in Section 1.3. As an exception to this rule, definitions that already exist in [Part 1], [Part 2], or [Part 3], are not redefined.

1.6.4Notation of numbers

Real numbers are represented using the digits 0 to 9, a decimal point, and optionally an exponential part. In addition, a positive and/or negative tolerance may follow a real number. Real numbers that do not include an explicit tolerance, have a tolerance of half the least significant digit that is specified.

comprises the range from 1.21 through 1.23; a specified value of 1.23 comprises the range from 1.225 through 1.234999…; and a specified value of comprises the range from 1.107 through 1.353.

Integer numbers in decimal notation are represented using the digits 0 to 9.

Integer numbers in hexadecimal notation are represented using the hexadecimal digits 0 to 9 and A to F, and are preceded by “0x” (unless explicitly indicated otherwise).

Single bit values are represented using the words ZERO and ONE.

Integer numbers in binary notation and bit patterns are represented using sequences of the digits 0 and

1that are enclosed in single quotes (‘’). In a sequence of n bits, the most significant bit (msb) is bit bn–1 and the least significant bit (lsb) is bit b0; the most significant bit is shown on the left-hand side.

1.6.5Units of physical quantities

Physical quantities are expressed in units of the International System of Units [SI].

1.6.6Bit ordering in a byte

The graphical representation of a byte is such that the msb is on the left, and the lsb is on the right. Figure 1-1 defines the bit positions in a byte.

Figure 1-1: Bit positions in a byte

1.6.7Byte numbering

The bytes in a sequence of n bytes are referred to as B0, B1, …, Bn–1. Byte B0 corresponds to the first byte in the sequence; byte Bn–1 corresponds to the last byte in the sequence. The graphical representation of a byte sequence is such that B0 is at the upper left-hand side, and byte Bn–1 is at the lower right-hand side.

1.6.8Multiple-bit Fields

Unless indicated otherwise, a multiple bit field in a data structure represents an unsigned integer value. In a multiple-bit field that spans multiple bytes, the msb of the multiple-bit field is located in the byte with

the lowest address, and the lsb of the multiple-bit field is located in the byte with the highest address. (Informative) Figure 1-2 provides an example of a 6-bit field that spans two bytes.

Figure 1-2: Example of multiple-bit field

1.7Operators

This Section 1.7 defines the operators used in this System Description Wireless Power Transfer, which are less commonly used. The commonly used operators have their usual meaning.

1.7.1Exclusive-OR

The symbol ‘ ’ represents the exclusive-OR operation.

1.7.2Concatenation

The symbol ‘||’ represents concatenation of two bit strings. In the resulting concatenated bit string, the msb of the right-hand side operand directly follows the lsb of the left-hand side operand.

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Figure 2-2: Primary Coil of Power Transmitter design A12

Table 2-1: Primary Coil parameters of Power Transmitter design A12

2.1.1.1.2Shielding

As shown in Figure 2-3, soft-magnetic material protects the Base Station from the magnetic field that is generated in the Primary Coil. The Shielding extends to at least 2.5 mm beyond the outer edge of the Primary Coil, and has a thickness of at least 0.5 mm. This version 1.1 Addendum A12 to the System Description Wireless Power Transfer, Volume I, Part 1, limits the composition of the Shielding to a choice from the following list of materials:

PM12PT6576 – TODAISU Corporation

Figure 2-3: Primary Coil assembly of Power Transmitter design A12

2.1.1.1.3Interface Surface

As shown in Figure 2-3, the distance from the Primary Coil to the Interface Surface of the Base Station is mm, across the top face of the Primary Coil. In addition, the Interface Surface of the Base

Station extends at least 5 mm beyond the outer diameter of the Primary Coil.

2.1.1.1.4Inter coil seperation

If the Base Station contains multiple type A12 Power Transmitters, the Primary Coils of any pair of those Power Transmitters shall have a center-to-center distance of at least 65 mm.

2.1.1.2Electrical details

As shown in Figure 2-3, Power Transmitter design A12 uses a full-bridge inverter to drive the Primary Coil and a series capacitance. Within the Operating Frequency range Specified below, the assembly of

voltage developed across the series capacitance can reach levels up to 100 V pk-pk.

Power Transmitter design A12 uses the Operating Frequency and duty cycle of the full-bridge inverter to control the amount of power that is transferred. For this purpose, the Operating Frequency range of the full-bridge inverter is kHz with a duty cycle of 50% and its duty cycle range is 2 … 50% at

an Operating Frequency of 205 kHz. A higher Operating Frequency and lower duty cycle result in the transfer of a lower amount of power. In order to achieve a sufficiently accurate adjustment of the power that is transferred, a type A12 Power Transmitter shall be able to control the frequency with a resolution of 0.5 kHz or better. a type A12 Power Transmitter shall control the duty cycle of the Power Signal with a resolution of 0.1% or better.

When a type A12 Power Transmitter first applies a Power Signal (Digital Ping; see [Part 1] Section 5.2.1), the Power Transmitter shall use an initial Operating Frequency of 175 kHz, and a duty cycle of 50%. If the Power Transmitter does not to receive a Signal Strength Packet from the Power Receiver, the Power Transmitter shall remove the Power Signal as defined in [Part 1], Section 5.2.1. The Power Transmitter may reapply the Power Signal multiple times at other-consecutively lower-Operating Frequencies within the range specified above, until the Power Transmitter receives a Signal Strength Packet containing an appropriate Signal Strength Value.