Voltage Conversion Device Controller Power Supply During Input Drop
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Solution Overview
Problem
In insulation type DC-DC converters, particularly in boost half-bridge systems, the power supply to the controller is disrupted when the input voltage decreases, leading to uncontrollable switching operations due to insufficient voltage for the controller's operation.
Innovation Solution
A voltage conversion device with a power supply circuit that obtains power from a connection point between the auxiliary switching element and the first capacitor, providing the necessary voltage to the controller even when the input voltage is low, eliminating the need for a tertiary winding or additional insulation circuits, and including a clamp circuit to stabilize the voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the input voltage decreases, then the power supply to the controller becomes insufficient, but adding a tertiary winding or additional insulation circuits increases device complexity
Solution Approach 1:
The patent extracts the power supply function for the controller from the main transformer by utilizing the voltage at the connection point between the auxiliary switching element and the first capacitor. This eliminates the need for a tertiary winding on the transformer, thereby maintaining controller power supply reliability while reducing transformer structure complexity.
Solution Approach 2:
The connection point between the auxiliary switching element and the first capacitor serves multiple functions: it is part of the main power conversion circuit and simultaneously provides the power supply for the controller. This multi-functionality approach eliminates the need for separate power supply circuits, reducing overall device complexity while ensuring reliable controller operation.
2Reliability
If additional insulation circuits are added to ensure controller power supply, then reliability improves, but ease of manufacture deteriorates
Solution Approach 1:
The patent merges the controller power supply circuit with the existing first conversion circuit by directly utilizing the connection point voltage. This integration eliminates the need for separate insulation circuits and reduces the number of components, thereby improving ease of manufacture while ensuring continuous controller operation through the boosted voltage at the connection point.
3Device complexity
If the input voltage is used directly for controller power supply, then device complexity is low, but the controller cannot operate when input voltage decreases
Solution Approach 1:
The patent introduces the connection point between the auxiliary switching element and the first capacitor as an intermediary voltage source for the controller. This connection point provides a boosted voltage that is higher than the input voltage, serving as an effective mediator that ensures stable controller operation even when the input voltage decreases, without requiring complex power supply circuits.
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
Ensures continuous operation of the controller by supplying the required power from the boosted voltage at the connection point, preventing resets and simplifying the configuration by avoiding complex transformer structures and additional insulation circuits.
Implementation Method 1
a first conversion circuit that converts a DC voltage at a DC power supply into an AC voltage by switching of the DC voltage
Implementation Method 2
a second conversion circuit that converts the AC voltage converted with the first conversion circuit into a DC voltage by rectification of the AC voltage
Data Source
AI summary
A voltage conversion device includes a first conversion circuit configured to switch a DC voltage at a DC power supply to convert the DC voltage into an AC voltage, a second conversion circuit configured to rectify the AC voltage converted with the first conversion circuit to convert the AC voltage into a DC voltage, a controller configured to control switching operation of the first conversion circuit, and emergency power supply circuits (a clamp circuit and a constant-voltage circuit) provided between a connection point of an auxiliary switching element and a capacitor and the controller. When an input voltage at the DC power supply decreases due to start-up of a starter motor in releasing idling stop of a vehicle, the emergency power supply circuits obtain a power supply voltage necessary for operation of the controller from a voltage at the connection point, and supply the power supply voltage to the controller.