DC Bias Voltage Cutting for Portable Terminal Power Control
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Solution Overview
Problem
Portable terminals experience increased power consumption due to derived DC bias voltage, even when in sleep mode, leading to rapid battery depletion.
Innovation Solution
A power consumption control apparatus and method that includes an oscillator, inverter, and DC bias voltage cutting unit, which creates signals to operate the terminal in sleep or standby mode and cuts the DC bias voltage using a capacitor connected to the feedback line, reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the inverter feeds its output back to the input terminal through a feedback resistor, then the circuit stability is improved, but the power consumption increases due to derived DC bias voltage
Solution Approach 1:
A capacitor is introduced as an intermediary component in the feedback path between the inverter output and input. The capacitor blocks the DC bias voltage while allowing AC signals to pass through the feedback resistor, thus maintaining circuit stability without the harmful DC component that causes excessive power consumption.
Solution Approach 2:
The DC bias voltage is extracted and removed from the feedback signal path using the capacitor's DC blocking property. This separates the useful AC feedback signal from the harmful DC component, allowing the circuit to maintain stability while eliminating the source of excessive power consumption.
2Use of energy by moving object
If the portable terminal operates in sleep mode, then the power consumption is reduced, but the DC bias voltage still depletes the battery rapidly
Solution Approach 1:
The capacitor serves as a DC blocking intermediary in the feedback path, preventing the DC bias voltage from reaching the inverter input even during sleep mode operation. This eliminates the continuous power drain that was occurring during low-power states, thereby extending battery life while maintaining the ability to operate in sleep mode.
3Power
If the feedback resistor is used to stabilize the inverter circuit, then the voltage output magnitude is increased, but the DC bias voltage causes rapid battery depletion
Solution Approach 1:
The capacitor is placed in series with the feedback resistor to form a high-pass filter. This configuration allows the AC signal components that contribute to voltage output magnitude to pass through while blocking the DC bias voltage that causes energy loss and battery depletion.
Solution Approach 2:
The DC bias voltage component is extracted and removed from the feedback signal using the capacitor's blocking property, separating it from the AC signal components. This allows the circuit to maintain the necessary voltage output magnitude while eliminating the harmful DC component that causes continuous energy loss.
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
The solution effectively reduces power consumption by cutting the DC bias voltage, thereby extending battery life and optimizing energy usage in portable terminals.
Implementation Method 1
A DC bias voltage cutting unit which cuts a DC bias voltage that is derived on a feedback line between an input port and an output port of the inverter, from the signals created by the oscillator
Data Source
AI summary
A method and apparatus control power consumption in a portable terminal by cutting the direct current (DC) bias voltage. The power consumption control apparatus of a portable terminal is connected to the processors. The apparatus includes an oscillator, an inverter, and a DC bias voltage cutting unit. The oscillator creates signals to control the portable terminal to be operated in a sleep mode or a standby mode. The inverter receives the signals from the oscillator and outputs inverted signals to the processors. The DC bias voltage cutting unit cuts a DC bias voltage that is derived on a feedback line between an input port and an output port of the inverter, from the signals created by the oscillator. The apparatus and method can allow the portable terminal to reduce the power consumption when the processors are driven.