Power Supply Unit Standby Wake-Up Transition
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Solution Overview
Problem
Conventional electronic control systems with two-stage power supply units face challenges in quickly transitioning from standby mode to normal operation mode due to delayed supply of electric current at the target voltage, leading to prolonged wake-up times and increased power consumption.
Innovation Solution
The system employs a voltage drop type switching regulator with a capacitor and a series regulator, where the switching regulator locks its switching element to an on-state during standby, reducing power consumption and allowing immediate voltage regulation upon wake-up, enabling rapid production of the target voltage upon satisfaction of the wake-up condition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a two-stage power supply unit with switching regulator and series regulator is used, then power loss is reduced and voltage control precision is improved, but the transition time from standby mode to normal operation mode is prolonged
Solution Approach 1:
The switching regulator performs preliminary charging of the smoothing circuit capacitor during standby mode, so that when wake-up occurs, the capacitor is already charged and can immediately supply current to the series regulator, eliminating the delay that would otherwise occur while charging the capacitor from scratch
Solution Approach 2:
The system dynamically switches between different operational states of the switching regulator (standby mode with capacitor charging, normal operation mode with full power supply) based on the microcomputer's operational state, optimizing both power efficiency during standby and response speed during wake-up
2Reliability
If the switching regulator operates in standby mode with frequent switching, then voltage regulation is maintained, but power consumption increases
Solution Approach 1:
Instead of continuous switching, the switching regulator performs periodic charging actions during standby mode, switching only when necessary to maintain the capacitor charge level, thereby reducing unnecessary switching losses while still ensuring voltage regulation capability is maintained
Solution Approach 2:
The smoothing circuit capacitor serves itself by being charged during standby mode to store energy, so that during wake-up it can autonomously provide the necessary current surge without requiring active switching control, reducing the burden on the switching regulator
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 approach reduces power consumption and shortens the time required to transition from standby to normal operation mode, ensuring timely and efficient power supply to electronic control units.
Implementation Method 1
a voltage drop type switching regulator having a capacitor and a series regulator. The switching regulator applies the input voltage of the input line to a connection line in response to the standby mode of the control unit while accumulating electric charge in the capacitor
Implementation Method 2
The switching regulator starts performing a switching operation in response to the satisfaction of the wake-up condition in the control unit to produce a transfer voltage on the connection line from the input voltage of the input line and to adjust the transfer voltage to an intermediate voltage
Implementation Method 3
The series regulator produces the supply voltage on the supply line from either the input voltage of the input line or the input voltage of the connection line applied by the switching regulator
Data Source
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AI summary
A power supply unit for supplying electric current of a supply voltage to a control unit in an electronic control system has switching regulator dropping an input voltage to an intermediate voltage, a first series regulator producing electric current of the supply voltage from the intermediate voltage, and a second series regulator producing electric current of the supply voltage lower than electric current produced in the first series regulator. During the standby mode of the control unit, an FET of the switching regulator is locked to the on state to accumulate electric charge in a capacitor of a smoothing circuit, while an output transistor of the first series regulator is locked to the off state. When a wake-up condition is satisfied in the control unit, the FET starts the switching operation, and the output transistor immediately starts the driving operation while using the charge supplied from the capacitor.