High-Side Switch IC Feedback Control for Stable Output Voltage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional high-side switch ICs face issues such as increased chip cost, noise generation, and design burden due to output voltage fluctuations and noise, necessitating large transistors and capacitors, and input voltage corrections for different systems.
Innovation Solution
A semiconductor integrated circuit device with a switching transistor, differential amplifier, and reference voltage source that maintains a constant output voltage by controlling the transistor based on a reference voltage, reducing the need for large transistors and capacitors, and eliminating the need for input voltage corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transistor with small on-resistance is used to reduce output voltage fluctuation, then the transistor element size must be increased, but this leads to increased chip cost
Solution Approach 1:
The patent implements a feedback mechanism where the output voltage is monitored and fed back to the control circuit. The control circuit adjusts the transistor gate voltage dynamically to compensate for voltage drops caused by on-resistance, thereby maintaining stable output voltage without requiring a transistor with excessively small on-resistance or large element size
Solution Approach 2:
The patent changes the operating parameters of the transistor by dynamically adjusting the gate-source voltage based on the actual output voltage and load conditions. This allows the transistor to operate at optimal points that balance on-resistance and element size, avoiding the need for oversized transistors while maintaining voltage stability
2Object-affected harmful factors
If a large-capacity capacitor is used as smoothing capacitor to suppress noise and stabilize output voltage, then the capacitance must be increased, but this increases the cost of the circuit
Solution Approach 1:
The feedback control circuit actively compensates for voltage fluctuations and noise by continuously monitoring the output voltage and adjusting the transistor operation accordingly. This active control replaces the need for large passive filtering capacitors, achieving noise suppression through control rather than through large energy-storing components
Solution Approach 2:
The patent replaces the passive mechanical/electrical filtering approach (large capacitors) with an active control approach using the control circuit and transistor. The control circuit electronically suppresses noise and stabilizes voltage without requiring large physical capacitors, thus reducing circuit cost and component count
3Reliability
If input voltage is corrected by shifting to higher voltage to compensate for on-resistance voltage drop, then the output voltage can be ensured, but the design burden on the user increases due to system-specific correction requirements
Solution Approach 1:
The patent implements a self-service mechanism where the control circuit automatically monitors the output voltage and adjusts the transistor operation to compensate for voltage drops. The system self-regulates without requiring external intervention or user-configured voltage correction, thereby ensuring reliable supply voltage while eliminating the design burden of system-specific correction calculations
Solution Approach 2:
The feedback control automatically adjusts the input voltage compensation based on actual output conditions. The control circuit senses the output voltage and load current, and dynamically adjusts the transistor gate voltage to maintain the desired output level, eliminating the need for users to pre-calculate and apply system-specific voltage corrections
Data Source
AI summary
Disclosed is a semiconductor integrated circuit device including: a switching transistor; a terminal to receive a control signal from outside; and a control circuit that controls the switching transistor based on the control signal. The control circuit includes: a reference voltage source that generates a reference voltage from the DC voltage; a differential amplifier to receive the reference voltage and a voltage of the voltage output terminal, and output a voltage applied to a control terminal of the switching transistor; and a logic circuit that generates a signal to control an operation state of the differential amplifier based on the control signal. According to an output signal of the logic circuit, the differential amplifier controls the switching transistor to be on in response to the control signal being a first logic level, and to be off in response to the control signal being a second logic level.