Boost Circuit Sensor Control Using Substitute Values
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Solution Overview
Problem
Temperature detecting devices often output erroneous signals when the power supply is stopped, leading to incorrect detection of the inverter element temperature, causing normal control operations to fail.
Innovation Solution
A sensor device with a boost circuit and internal power supply that generates a drive signal to increase voltage, and a controller that calculates values based on sensor signals, using a substitute value instead of calculated values when the boost circuit is turned off to prevent erroneous detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the power supply is stopped to save energy, then energy consumption is reduced, but erroneous detection of sensor signals occurs
Solution Approach 1:
The controller stores the last valid sensor signal value in memory before stopping the power supply. When the power supply is restarted, the controller retrieves this stored value and outputs it as a substitute, preventing erroneous detection during the power stop period while maintaining energy savings.
Solution Approach 2:
The controller creates a copy of the last valid sensor signal value and stores it in memory. This copied value is then used as a substitute when the actual sensor signal becomes invalid due to power supply stoppage, ensuring continuous reliable output without requiring continuous power consumption.
2Use of energy by moving object
If the boost circuit is stopped to reduce power consumption, then energy efficiency is improved, but sensor signal generation fails leading to incorrect detection
Solution Approach 1:
Before stopping the boost circuit, the controller calculates and stores the last valid sensor value in memory. When the boost circuit is stopped to save power, the controller retrieves this pre-stored value and outputs it as a substitute, ensuring continuous accurate detection without requiring the boost circuit to remain active.
Solution Approach 2:
The memory unit acts as an intermediary between the boost circuit and the output. When the boost circuit is stopped, the stored sensor value in memory serves as a substitute signal, mediating the gap between power savings and continuous detection requirements.
3Use of energy by moving object
If the power supply voltage is reduced to save energy, then energy consumption is lowered, but detection accuracy deteriorates
Solution Approach 1:
The controller calculates and stores the last valid sensor value before reducing power supply voltage. When voltage is reduced and sensor detection becomes unreliable, the controller outputs this pre-calculated stored value as a substitute, maintaining detection accuracy while enabling energy-saving voltage reduction.
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
Prevents erroneous detection of the inverter element temperature and other sensor states by using substitute values when the boost circuit is stopped, ensuring accurate control operations.
Implementation Method 1
a boost circuit configured to increase voltage from a battery
Data Source
AI summary
A sensor device includes a boost circuit configured to increase voltage from a battery, an internal power supply configured to supply the voltage that is increased by the boost circuit, and a controller. The controller includes a drive signal generating unit configured to generate a boost-circuit drive signal for driving the boost circuit, and a calculating unit configured to calculate, as a calculated value, a value in accordance with a state of a detection target based on a sensor signal that is generated using the internal power supply. The controller is further configured to use a substitute value as an internal recognition value of the state of the detection target, instead of the calculated value based on the sensor signal when turning off the boost-circuit drive signal to stop the boost circuit.