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Random number generating device

A technology for generating devices and random numbers, applied in random number generators, electrical digital data processing, digital data processing components and other directions, can solve problems such as rising cost and complex structure, and achieve the effect of simple structure

Inactive Publication Date: 2013-07-24
MAKITA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in this case, the structure as a random number generator becomes complicated, and there is a problem that the cost increases

Method used

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no. 1 approach ］

[0042] The random number generating device of this embodiment is realized as one of the functions of the charger 30. When the battery pack 10 is installed, the random number generating device judges (authenticates) whether the battery pack 10 is a standard specification battery pack, and when judging that the battery pack 10 is When the battery pack 10 is a standard specification battery pack, charging of the battery pack 10 is started.

[0043] Such as figure 1 As shown, the battery pack 10 includes: a battery 20 formed by connecting a plurality of battery cells in series; It is connected to an electric tool or an electric working machine to be supplied with power, or is connected to the charger 30 .

[0044] In addition, the battery pack 10 is provided with: a voltage detection unit 26 that detects the voltage of the battery 20; machine) and the charging current used to charge the battery 20 from the charger 30 .

[0045] Furthermore, detection signals from the above-ment...

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Abstract

The invention provides a random number generating device which can generate a random number based on operation processing of a microcomputer without the need to use an external circuit which outputs differently according to supply voltage. The microcomputer of a charger charging a battery pack has a main oscillating circuit and an auxiliary oscillating circuit. The auxiliary oscillating circuit is higher in temperature dependency than that of the main oscillating circuit, and is used for counting in a timer. The microcomputer generates a random number for authenticating the battery pack according to the clock pulse action of the main oscillating circuit with low temperature dependency. When the random number is generated, the microcomputer enables the timer to assist counting (S110) of clock pulse, then the counting of the timer reaches a specified value, and the time (S120, S130) when the timer ceases is measured by counting a variable i. Since the time from start to cease of the timer changes based on the temperature of the auxiliary oscillating circuit, the random number can be generated by using the main oscillating circuit to measure.

Description

technical field [0001] The present invention relates to a random number generator for generating random numbers through the operation of a microcomputer. Background technique [0002] Electric equipment (electric tools, electric working machines, etc.) that receive power supply from the battery and a charger that charges the battery, if a non-standard battery that is not a standard battery is installed, the equipment may be damaged. In case of a malfunction or when the battery is abnormally hot. [0003] Therefore, a technique is known in which, when a battery is installed in such a device, it is determined (authenticated) whether the installed battery is a standard product using a random number (for example, refer to Patent Document 1). [0004] Furthermore, Patent Document 1 proposes a technique of using noise bits (lower bits) of an A / D converted value obtained by an A / D converter as a random number. [0005] Also, as a random number generating circuit for generating ra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F7/58
CPCG06F7/582G06F7/588
Inventor 冈林寿和
Owner MAKITA CORP
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