Cordless Telephone Base Unit Power Failure Communication
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Solution Overview
Problem
Cordless telephone sets that support power failure features become heavy due to the inclusion of circuit elements like switch circuits and detection units in the handset, compromising the weight and usability of the device.
Innovation Solution
A cordless telephone set design where the base unit includes a determination unit and a switch circuit that allows power supply from a secondary battery in the handset only when external power supply voltage is low, enabling radio communication without burdening the handset with these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If circuit elements such as switch circuit and detection unit are installed in the cordless handset to enable power failure communication, then the cordless handset can communicate with the base unit during power failure, but the weight of the cordless handset becomes heavy
Solution Approach 1:
The patent extracts the detection unit and switch circuit from the cordless handset and relocates them to the base unit. The base unit's detection unit detects power failure conditions, and the base unit's switch circuit controls the power supply from the handset's battery to the base unit. This extraction eliminates the need for these circuit elements in the handset, thereby reducing its weight while maintaining the power failure communication capability.
Solution Approach 2:
The patent inverts the traditional power supply relationship by allowing the handset's battery to power the base unit during power failure conditions, rather than the base unit solely powering the handset. The switch circuit enables bidirectional power flow control, where the handset becomes the power source for the base unit when external power is unavailable, thus enabling communication during power failures without adding weight to the handset.
2Adaptability or versatility
If the handset includes a second radio communicating section that performs modulation and demodulation with voltage output from the secondary battery, then the handset can operate during power failure, but the device complexity increases
Solution Approach 1:
The patent implements multi-functionality by enabling the first radio communicating section in the base unit to serve dual purposes: communicating with the handset during normal power supply conditions and receiving power from the handset's battery during power failure conditions. The switch circuit enables the base unit to dynamically switch between power supply modes, allowing the same hardware to adapt to different operational scenarios without requiring separate dedicated circuits for each mode.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design achieves a lightweight handset while maintaining voice call functionality during power failures without imposing a burden on the user, by ensuring power is supplied from the secondary battery to the base unit when external power is insufficient.
Implementation Method 1
the handset includes a secondary battery which is charged by the predetermined voltage output from the secondary battery when the handset is placed on the base unit
Data Source
AI summary
Disclosed is a cordless telephone set capable of suppressing power consumption during power failures to lengthen the time for a call. A cordless telephone (1) receives power supply from a handset (3) placed on a charging section (26) of a base unit (2), during power failures. In order to suppress current consumption of a secondary battery (BT) of the handset (3), the base unit (2) instructs a base unit radio section (21) to be switched to a transmission power-saving mode in which transmission power of the base unit radio section (21) is reduced down to a level at which no communication error occurs, according to radio wave information transmitted from the handset (3) and indicates the received signal strength of a radio signal from the base unit radio section (21) of the base unit (2), received by a handset radio section (39) of the handset (3).