Staggered Slave Device Startup in Bus Power Supply Circuits
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Solution Overview
Problem
In traditional bus power supply systems, slave devices often start up simultaneously, leading to an instantaneous increase in power load, which can cause voltage drops, preventing remote slave devices from activating due to excessive voltage drops.
Innovation Solution
The proposed bus power supply system incorporates a start-up circuit with a switch, timer, and oscillator in each slave device, allowing them to power on at different times by adjusting the impedance of external resistors or internal start-up time settings, thereby avoiding overlapping power-on sequences and voltage drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If slave devices start up simultaneously in a bus power supply system, then the power supply system can be simple and the wiring complexity is reduced, but the instantaneous power load increases causing voltage drops that prevent remote slave devices from activating
Solution Approach 1:
The patent applies preliminary action by implementing a start-up delay mechanism in each slave device. The delay circuit delays the power-on signal transmission to downstream slave devices, ensuring that devices are activated sequentially rather than simultaneously. This preliminary timing adjustment prevents instantaneous power load spikes while maintaining the simplicity of the bus power supply architecture.
2Reliability
If slave devices are equipped with start-up delay circuits to power on sequentially, then voltage drops are avoided and power supply stability is improved, but the device complexity increases due to additional circuit components
Solution Approach 1:
The patent implements self-service by designing autonomous start-up delay circuits integrated into each slave device. Each device independently generates its own delayed power-on signal without requiring external control from the master device. This self-service approach maintains power supply stability through sequential activation while minimizing the need for additional control circuitry in the master device.
Solution Approach 2:
The patent applies periodic action through the use of delay circuits that introduce specific time intervals between the activation of consecutive slave devices. This periodic timing ensures that each device completes its power-up sequence before the next device activates, preventing power load conflicts and voltage drops while maintaining a regular, predictable power-on pattern across the bus.
3Reliability
If the master device controls the power-on sequence of slave devices, then power supply stability can be maintained, but the control complexity and communication overhead increase
Solution Approach 1:
The patent implements self-service by enabling each slave device to autonomously generate and transmit its own delayed power-on signal to downstream devices. This distributed control approach eliminates the need for the master device to manage the power-on sequence, reducing control complexity and communication overhead while maintaining power supply stability through the inherent delay mechanism in each device.
Data Source
AI summary
An electronic device is provided. The electronic device includes a power pin, a main circuit, and a start-up circuit. The power pin is configured to receive a power supply. The start-up circuit includes a switch coupled between the power pin and the main circuit, a timer and an oscillator. The switch is configured to selectively provide the power supply to the main circuit in response to a control signal. The oscillator, is configured to provide a periodic signal. The timer is configured to provide the control signal to turn on the switch when counting to a start-up time according to the periodic signal, so that the main circuit is configured to provide a fixed voltage according to the power supply.