Boost DC-DC Converter With Segmented Circuits For Low Voltage Startup
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Solution Overview
Problem
Conventional boost DC-DC converters fail to initiate boost operation when the input power voltage is low, leading to insufficient power conversion and inability to activate loads with high power consumption, resulting in increased size and power conversion loss.
Innovation Solution
Incorporating a first and second boost circuit with a storage capacitor to generate and store boosted power, allowing the first boost circuit to start operation with stored power when its voltage meets the minimum operation voltage, and using the third boosted power to control the N-channel MOS transistor for efficient power conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conventional boost DC-DC converter uses a single boost circuit with direct input power supply to control circuit, then the circuit structure is simple, but the converter cannot start boost operation when input power voltage is low
Solution Approach 1:
The converter is divided into two independent boost circuits: a first boost circuit for main power conversion and a second boost circuit for generating startup power. This segmentation allows each circuit to be optimized for its specific function, enabling the system to start operation even when input voltage is low.
Solution Approach 2:
The second boost circuit operates first to generate and store boosted power in a storage capacitor before the first boost circuit starts operation. This preliminary action ensures that the control circuit has sufficient voltage to initiate and control the first boost circuit, even when the input power voltage is below the minimum operation voltage.
2Adaptability or versatility
If the converter requires high input voltage to start operation, then the control circuit can operate reliably, but the converter cannot handle low voltage input scenarios
Solution Approach 1:
The storage capacitor acts as an intermediary energy storage device between the second boost circuit and the control circuit. It stores the boosted power generated by the second circuit and provides it to the control circuit, ensuring reliable operation even when the input voltage is too low for the first boost circuit to start directly.
3Power
If the converter is designed for high power consumption loads, then the load can be activated, but the converter size and power conversion loss increase
Solution Approach 1:
The second boost circuit is designed to provide only the minimum necessary power for control circuit operation, not the full power required by the load. This partial action approach allows the system to handle high power consumption loads while keeping the second circuit relatively small, reducing overall converter size and power conversion 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
Enables boost operation initiation at low input power voltages, reduces the size and power conversion loss of the converter, and ensures the first boosted power meets or exceeds load power consumption.
Implementation Method 1
a storage capacitor configured to store the second boosted power as a storage power, and supply the storage power to the first boost circuit as an operation power source of the first boost circuit
Implementation Method 2
The N-channel MOS transistor 305 switches current which flows from the other terminal of the coil 302 to a ground terminal
Implementation Method 3
The diode 303 rectifies the current output from the other terminal of the coil 302 and outputs the boosted power
Data Source
AI summary
A boost DC-DC converter includes: an input terminal; an output terminal; a first boost circuit configured to generate, from an input power to the input terminal, a first boosted power having a higher voltage than a voltage of the input power, and outputs the generated first boosted power from the output terminal; a second boost circuit configured to generate, from the input power, a second boosted power having a higher voltage than the voltage of the input power; and a storage capacitor configured to store the second boosted power as a storage power, and supply the storage power to the first boost circuit as an operation power source. The first boost circuit is configured to start a boost operation with the storage power when a voltage of the storage power is equal to or higher than a minimum operation voltage of the first boost circuit.