Voltage-Current Conversion Circuit Using Correction Current to Shorten Start-Up Period
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Solution Overview
Problem
The existing voltage-current conversion circuits have a long start-up period due to the charging of phase compensation capacitors in the error amplifier circuit, which affects the conversion of input voltage to output current.
Innovation Solution
A voltage-current conversion circuit that includes a first MOS transistor and a correction current generation unit using a second resistor to generate a correction current based on the gate-source voltage of the first MOS transistor, which is added to the current flowing through a first resistor to produce the conversion current, thereby eliminating the need for an error amplifier circuit and shortening the start-up period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an error amplifier circuit with phase compensation capacitor is used for voltage-current conversion, then the conversion accuracy is improved, but the start-up period becomes long
Solution Approach 1:
The patent extracts and removes the phase compensation capacitor from the error amplifier circuit. By eliminating this capacitor, the circuit avoids the charging delay that causes long start-up periods, while maintaining voltage-current conversion functionality through an alternative configuration using operational amplifier and resistors.
Solution Approach 2:
The patent changes the circuit configuration parameters by replacing the error amplifier with an operational amplifier and adjusting the resistor network arrangement. This parameter change allows the circuit to achieve voltage-current conversion without requiring phase compensation, thereby shortening the start-up period while preserving conversion accuracy.
2Stability of the object's composition
If phase compensation capacitor is included in error amplifier circuit, then circuit stability is improved, but conversion speed is reduced
Solution Approach 1:
The patent removes the phase compensation capacitor from the circuit configuration. This extraction eliminates the time delay associated with capacitor charging, thereby increasing the conversion speed while maintaining circuit stability through the operational amplifier's inherent characteristics and resistor network design.
Solution Approach 2:
The patent substitutes the error amplifier mechanism with an operational amplifier-based voltage-current conversion mechanism. This substitution replaces the need for phase compensation hardware, enabling faster response while maintaining stability through the new circuit architecture.
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 configuration allows for a faster start-up period by eliminating the delay caused by phase compensation capacitors, enabling the conversion current to reach a steady-state value more quickly without using an error amplifier circuit.
Implementation Method 1
a correction current generation unit (129) including a second resistor (127), and configured to generate, as a correction current, through use of the second resistor (127), a current corresponding to a current generated when a voltage corresponding to an absolute value of a gate-source voltage of the first MOS transistor (121) is applied to the first resistor (126)
Data Source
AI summary
Provided are a switching regulator and a voltage-current conversion circuit configured to shorten a start-up period. The voltage-current conversion circuit includes: a first MOS transistor of a first conductivity type including a gate and a drain connected in common, and a source connected to a first power supply terminal; a first resistor connected between the drain of the first MOS transistor and a second power supply terminal; and a correction current generation unit including a second resistor, and configured to generate, as a correction current, through use of the second resistor, a current corresponding to a current generated when a voltage corresponding to an absolute value of a gate-source voltage of the first MOS transistor is applied to the first resistor. The voltage-current conversion circuit is configured to add the correction current to a current flowing through the first resistor, to thereby generate the conversion current.