Bus-Powered Slave Circuit for Stable Voltage During Signal Transitions
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Solution Overview
Problem
Existing slave circuits experience voltage instability and increased power consumption due to slow response times of operational amplifiers during communication signal transitions, leading to uncontrolled voltage rises in capacitors.
Innovation Solution
Incorporating a control unit to synchronize the operation of switches with communication signals, including first and second switches, and optionally enabling/disabling operational amplifiers, to manage capacitor charging paths and suppress voltage rises.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If operational amplifiers are used in the regulator circuit, then voltage regulation function is provided, but response speed is slow causing voltage instability during communication signal transitions
Solution Approach 1:
The power supply circuit is segmented into multiple independent paths: a first path with a first capacitor for bulk energy storage, and a second path with a second capacitor and diode for rapid response during communication transitions. This segmentation allows each capacitor to be optimized for its specific function, resolving the contradiction between stability and response speed.
Solution Approach 2:
A diode is introduced as an intermediary element in the second capacitor path, enabling it to activate only during specific conditions (when communication signals cause voltage drops). This intermediary component allows the second capacitor to provide rapid voltage supplementation without interfering with the normal operation of the operational amplifier-based regulator, thus improving response speed while maintaining stability.
2Reliability
If capacitor size is increased to stabilize voltage, then voltage stability improves, but power consumption increases
Solution Approach 1:
The capacitance function is segmented between two capacitors of different sizes with different functions. The first capacitor provides bulk energy storage for general stability, while the second capacitor provides targeted rapid supplementation only during communication signal transitions. This segmentation allows using smaller capacitors overall, reducing power consumption while maintaining stability.
Solution Approach 2:
The second capacitor operates periodically only when communication signals cause voltage drops, rather than continuously. The diode enables this periodic action by conducting only during specific voltage conditions, allowing the capacitor to charge and discharge in synchronized pulses with communication activity, thereby reducing overall power consumption while providing stability when needed.
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
Stabilizes output voltage and reduces power consumption by precisely controlling switch states in response to communication signals, ensuring stable power supply and efficient energy use.
Implementation Method 1
a diode bridge circuit configured to rectify a voltage of the bus
Implementation Method 2
an operational amplifier having a first input configured to receive a feedback voltage corresponding to a voltage of the capacitor connection pin, having a second input configured to receive a reference voltage, and having an output connected to a gate of the P-type transistor
Data Source
AI summary
A slave circuit that is connected to a master circuit via a bus, receives a power supply voltage via the bus, and receives a communication signal superimposed on the power supply voltage includes a diode bridge circuit configured to rectify a voltage of the bus, a capacitor connection pin to which a capacitor is connected, a P-type transistor connected between an output of the diode bridge circuit and the capacitor connection pin, an operational amplifier having a first input configured to receive a feedback voltage, having a second input configured to receive a reference voltage, and having an output connected to a gate of the P-type transistor, a receiving circuit configured to receive the communication signal, a first switch connected between the gate and source of the P-type transistor, and a control unit configured to control the first switch by generating a control signal synchronous with the communication signal.