Charge Pump Boosting Circuit Peak Current Suppression
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Solution Overview
Problem
Conventional charge pump boosting circuits experience a temporary drop in input voltage due to peak currents flowing into capacitors during the start of a boosting operation, leading to malfunctions in semiconductor chips.
Innovation Solution
A boosting circuit and method that includes a double boosting step followed by a triple boosting step, where the input voltage is applied to a first capacitor and then to an output capacitor in a predetermined period, and subsequently, the voltage across the first capacitor is applied to the second capacitor, and finally, the sum of voltages across both capacitors is applied to the output capacitor, reducing peak currents and maintaining the input voltage level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the boosting operation starts immediately with conventional charge pump circuit, then the voltage boosting function is activated, but peak currents flow into capacitors causing input voltage drop and circuit malfunction
Solution Approach 1:
The patent applies preliminary action by introducing a predetermined delay period before the main boosting operation begins. During this delay period, the switching elements are controlled in advance to prevent peak currents from flowing into the capacitors, thereby avoiding input voltage drops and ensuring stable circuit operation from the start of the boosting process
2Productivity
If the input voltage is applied directly to the output capacitor during initial boosting, then voltage multiplication is achieved, but large peak currents are generated causing voltage level instability
Solution Approach 1:
The patent implements periodic action by dividing the boosting operation into distinct phases: an initial predetermined delay period with controlled switching, followed by the main boosting phase. This periodic control pattern allows the circuit to establish stable operating conditions before executing rapid voltage multiplication, thus maintaining voltage level stability while achieving high boosting productivity
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 allows for boosting the input voltage to three or higher integer times without causing a drop in the input voltage level, effectively suppressing peak currents and ensuring stable operation of semiconductor chips.
Implementation Method 1
capacitors Ca, C1, C2, and C3 for charge accumulation
Data Source
AI summary
A boosting circuit of charge pump type includes: charging portion for applying an input voltage to a first capacitor; double boosting portion for applying the input voltage to a second capacitor and applying a sum of the input voltage and a voltage across the first capacitor to an output capacitor in a first predetermined period after start of a boosting operation; and triple boosting portion for repeating in order, after end of the first predetermined period, a step of applying the sum of the input voltage and the voltage across the first capacitor to the second capacitor and a step of applying a sum of the voltage across the first capacitor and a voltage across the second capacitor to the output capacitor.