Voltage Booster Circuit Startup Reliability via Switched Reference
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Solution Overview
Problem
Conventional voltage booster circuits face malfunctions during startup due to voltage drops across diodes, which can prevent the booster control circuit from initiating boosting operations, especially when the reference voltage is low, leading to insufficient power supply for the booster section.
Innovation Solution
A voltage booster circuit design that includes a reference voltage generation circuit, a booster section, a booster control section, and a switch controlled by a comparator, where the switch connects the reference voltage line directly to the boosted voltage line during startup to ensure the booster control section receives the necessary voltage for initialization, avoiding voltage drops and ensuring proper startup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a diode is used to supply reference voltage to the boosted voltage line, then the reference voltage can be supplied to the booster control section, but the voltage drops due to the diode forward voltage drop, lowering the potential below the required start-up voltage
Solution Approach 1:
A switch element is introduced as an intermediary component between the reference voltage line and the boosted voltage line. This switch replaces the diode and is controlled by a control circuit to connect the reference voltage directly to the boosted voltage line during start-up, eliminating the voltage drop caused by the diode's forward voltage while still enabling voltage supply.
Solution Approach 2:
The invention changes the electrical parameter (voltage level) by using a controlled switch instead of a passive diode. The control circuit dynamically adjusts the connection state to maintain the reference voltage level without the forward voltage drop, ensuring the boosted voltage line receives sufficient voltage for start-up.
2Productivity
If the power supply is turned ON, then the voltage booster circuit should start operating, but the boosted voltage is initially at 0 V, preventing the booster control circuit from starting up
Solution Approach 1:
The control circuit performs a preliminary action by detecting the voltage difference between the reference voltage line and the boosted voltage line. When the boosted voltage is initially at 0 V, the control circuit activates the switch element to connect the reference voltage line to the boosted voltage line, providing the necessary voltage for the booster control section to start up before normal boosting operations begin.
Solution Approach 2:
The control circuit uses feedback by continuously monitoring the voltage difference between the reference voltage line and the boosted voltage line. Based on this feedback, the control circuit adjusts the switch element's state to ensure proper voltage supply during start-up, enabling the booster control section to initialize correctly.
Data Source
AI summary
A voltage booster circuit includes a reference voltage generation circuit that generates a first potential and supplies the first potential to a first potential line; a booster section that supplies a second potential to a second potential line, the second potential being boosted from the first potential; a booster control section, connected to the second potential line, that controls the booster section in accordance with the second potential; a switch connected to the first potential line and the second potential line; and a control circuit that controls the switch in accordance with a potential difference between the first potential and the second potential.