Transformer Power Supply Gate Drive for Surge and Noise Control
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Solution Overview
Problem
Conventional power supply devices experience increased electric power loss and noise due to surge voltage generation during switching element turn-on, as current from the clamping capacitor flows immediately after turn-on, leading to higher current and voltage multiplication.
Innovation Solution
A power supply device configuration with a transformer, primary, secondary, and auxiliary windings, along with specific rectifying circuits and resistors, where the resistance value for current flow into the gate terminal of the switching element is lower than for current flow out, optimizing switching speeds to reduce power loss and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a clamp circuit with clamping capacitor and diodes is used to suppress surge voltage, then surge voltage is suppressed, but electric power loss increases due to large current immediately after switching element turn-on
Solution Approach 1:
The gate resistance is made asymmetric and dynamic: low resistance path for turn-on to enable fast switching and reduce power loss, high resistance path for turn-off to suppress surge voltage. This dynamic adjustment of resistance based on switching direction resolves the contradiction between fast switching (low loss) and surge suppression.
Solution Approach 2:
Different resistance values are applied to different directions of current flow through the gate terminal. The circuit provides locally optimized properties: low resistance for turn-on current path and high resistance for turn-off current path, allowing each switching event to have optimal characteristics for its specific purpose.
2Loss of energy
If turn-on speed is increased to reduce electric power loss, then power loss decreases, but noise generation increases during switching
Solution Approach 1:
The switching characteristics are made dynamic and direction-dependent. Turn-on uses low resistance for fast switching to minimize power loss, while turn-off uses high resistance to control dv/dt and reduce noise. This dynamic adaptation resolves the contradiction between fast switching and noise reduction.
Solution Approach 2:
The gate resistance parameter is changed based on the switching direction. By using different resistance values for turn-on and turn-off, the circuit optimizes the switching speed and noise characteristics for each event, achieving both low power loss and low noise operation.
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 configuration reduces electric power loss during turn-on and noise generation during turn-off by ensuring faster turn-on speed than turn-off speed, balancing power loss and noise levels.
Implementation Method 1
a transformer including a primary winding, a secondary winding and an auxiliary winding
Implementation Method 2
a first circuit in which a first capacitor and a first rectifying element are connected in series
Data Source
AI summary
A power supply device includes a transformer including a primary winding, a secondary winding and an auxiliary winding, first, second and third circuits, and a switch. The first circuit in which a first capacitor and a first rectifier are connected in series is connected to the primary winding in parallel. The switch of which one end is connected to one end of the primary winding. The second circuit in which the auxiliary winding and a second rectifier are connected in serial is connected between a connecting point, to which the first capacitor and the first rectifier are connected, and the other end of the switch. The third circuit including a resistor and a third rectifier is connected to a gate of the switch. In the third circuit, a resistance value in a direction where a current flows into the gate of the switch is smaller than that in a direction where the current flows out of the gate.