Charge Pump Circuit Voltage Slope Control
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Solution Overview
Problem
Conventional semiconductor integrated circuits experience steep changes in output voltage when the charge pump circuit starts or stops operating, leading to transient displacement issues affecting circuit blocks, particularly in portable appliances with limited mounting area and high current supply requirements.
Innovation Solution
A semiconductor integrated circuit design that includes a charge pump circuit connected to both a first and second capacitor, with a gate driving circuit controlling the switching transistors to manage the charging process, reducing the slope of output voltage changes by adjusting the ON duty of switching transistors and using a current source to control charging, thereby minimizing the impact on circuit blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the charge pump circuit starts or stops operating, then the output voltage changes rapidly to meet current supply requirements, but this causes steep output voltage changes and transient displacement affecting circuit blocks
Solution Approach 1:
The gate driving circuit performs preliminary action by controlling the switching transistors to gradually change the ON duty cycle before the charge pump circuit fully starts or stops operation. This gradual transition prevents sudden output voltage changes and reduces transient displacement affecting circuit blocks, while still achieving the required current supply capability.
2Power
If the charge pump circuit operates at high power to meet current requirements, then the current supply capability is sufficient, but the output voltage changes steeply causing transient sound and disturbances
Solution Approach 1:
The gate driving circuit dynamically adjusts the ON duty cycle of switching transistors during charge pump operation. By making the duty cycle adjustable and time-dependent, the circuit can provide high current supply capability when needed while gradually transitioning the output voltage to minimize transient sound and disturbances.
3Area of stationary object
If the charge pump circuit is integrated with circuit blocks on the same substrate to save mounting area, then the mounting area is reduced, but the transient voltage changes affect the circuit blocks
Solution Approach 1:
The gate driving circuit controls the switching transistors to gradually adjust the ON duty cycle, performing preliminary action to prevent sudden voltage changes. This protects integrated circuit blocks from transient voltage disturbances while maintaining the space-saving integration on the same substrate.
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 design effectively suppresses steep output voltage changes and transient displacement, allowing for integration of circuit blocks on the same semiconductor board while maintaining a small charging slope, thus preventing disturbances like transient sound and saving mounting area.
Implementation Method 1
a charge pump circuit connected to a first capacitor and a second capacitor, charges the first capacitor with an input voltage, transfers a charge accumulated in the first capacitor to the second capacitor
Data Source
AI summary
A semiconductor integrated circuit that suppresses steep changes of an output voltage when starting of a charge pump circuit to suppress transient displacement of output of a circuit block operating independently of the charge pump circuit is provided.A semiconductor integrated circuit has: a charge pump circuit which charges a first capacitor with an input voltage, transfers a charge accumulated in the first capacitor to a second capacitor, outputs, as an output voltage, a voltage of the second capacitor, and is capable of changing over a capability of charging the second capacitor; a first circuit block that receives a positive voltage and a grounding potential; and a second circuit block that receives the positive voltage and the output voltage of the charge pump. The semiconductor integrated circuit suppresses the charging capability by the charge pump circuit when starting of the charge pump circuit.