Standby Power Supply Circuit for 2-Wire Intercom Systems
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Solution Overview
Problem
Conventional 2-wire intercom systems face limitations in alternating current impedance, particularly at standby status, leading to reduced audio quality and limited device capacity due to the large size of inductors required for sufficient power supply and impedance.
Innovation Solution
A standby power supply circuit is introduced, comprising two separate power supply modules: one for standby and one for operation, utilizing a constant current circuit with a main and auxiliary path, along with a voltage regulator unit, to maintain high alternating current impedance and stable voltage, even under varying conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coil inductor is used as the inductance component to provide sufficient impedance and power supply capacity, then the alternating current impedance is improved, but the size of the inductor becomes very large
Solution Approach 1:
The patent replaces the mechanical coil inductor with an electronic inductance circuit composed of active electronic components (transistors, capacitors, resistors). This substitution maintains the necessary alternating current impedance while eliminating the large physical size associated with traditional coil inductors, thereby resolving the contradiction between impedance reliability and component size.
2Device complexity
If a single system power supply is used to serve all device loads, then the device complexity is reduced, but the alternating current impedance becomes insufficient when large numbers of devices are connected
Solution Approach 1:
The patent segments the single power supply system into multiple independent power supply modules, each serving specific device loads. This segmentation allows each module to maintain sufficient alternating current impedance independently, while the overall system complexity remains manageable due to the modular architecture. Each module can be optimized for its specific load requirements.
3Weight of stationary object
If electronic inductance circuit is used to replace coil inductor to reduce size, then the device complexity is reduced, but the alternating current impedance becomes limited especially for operation circuit
Solution Approach 1:
The patent employs parameter changes by dynamically adjusting the operating parameters of the electronic inductance circuit based on whether devices are in standby or operation mode. During standby mode, parameters are optimized for high impedance with minimal power consumption. During operation mode, parameters are adjusted to maintain sufficient impedance while supporting higher power demands, thus resolving the limitation of fixed-parameter electronic inductance circuits.
Data Source
Figure 1~2a
Figure 2b~2c
Figure 2d~3
AI summary
A standby power supply circuit (300) for a 2-wire bus intercom system and an apparatus thereof. The standby power supply circuit (300) is separated into two power supply modules, in which the first power supply module is a power supply to a standby circuit (302) and the second power supply module is a power supply to an operation circuit (304). The power supply to the operation circuit (304) is switched off by a constant circuit switch (310) when a device load is at the standby status. The power supply to the standby circuit (302) comprises a constant current circuit (306) whose alternating current impedance is large. With the standby power supply circuit, the larger alternating current impedance for the 2-wire intercom system is achieved, which can offer sufficient power for many device loads both in the conditions of operation and standby status.