Soft Switching Drive Circuit With Programmable Delay Control
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Solution Overview
Problem
Switching power circuits face challenges with high switching losses, component stresses, and electromagnetic interference (EMI) due to the inherent limitations of existing phase-shift schemes for high-frequency power conversion, particularly in achieving soft switching efficiently.
Innovation Solution
A switching drive circuit is developed that generates delay signals to control the switching signals in a full-bridge phase-shift switching power circuit, enabling soft switching by using delay circuits to synchronize the on/off times of switches and providing a regulated power source for the high-side and low-side drivers, allowing for efficient energy transfer and reduced switching losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If phase-shift schemes of soft switching are used to reduce switching losses, then switching losses are reduced, but device complexity increases due to additional magnetic components and resonant inductance requirements
Solution Approach 1:
The patent extracts the delay function from complex magnetic component-based soft switching schemes and implements it through simple delay circuits with programmable delay terminals. This separates the timing control function from the power conversion function, achieving soft switching without additional magnetic components or resonant inductance.
Solution Approach 2:
The patent introduces delay circuits as intermediary components between the control signal and the switching devices. These delay circuits act as mediators that precisely control the timing of switch activation, enabling soft switching through timing control rather than complex magnetic resonance circuits.
2Weight of stationary object
If high-frequency operation is implemented to reduce component size and weight, then size and weight are reduced, but switching losses and electromagnetic interference increase
Solution Approach 1:
The patent applies preliminary action by using delay circuits to pre-control the switching timing before the actual switching event occurs. The programmable delay terminals allow the switching signals to be timed in advance to achieve zero-voltage switching conditions, reducing switching losses at high frequencies without increasing component weight.
3Reliability
If additional magnetic components are added to achieve soft switching, then switching performance is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the soft switching achievement from magnetic component-based resonance and relocates it to electronic delay circuits. This eliminates the need for additional magnetic components while maintaining reliable soft switching performance through precise electronic timing control.
Solution Approach 2:
The patent substitutes magnetic component-based mechanical resonance with electronic delay circuit-based timing control. This replacement eliminates physical magnetic components and their associated complexities while achieving the same soft switching effect through electronic signal timing.
Data Source
AI summary
A switching drive circuit for soft switching is disclosed. It includes an input circuit to receive an input signal. A first delay circuit generates a first delay time in response to the enable of the input signal. A second delay circuit generates a second delay time in response to the disable of the input signal. A switching signal generator generates switching signals. The pulse width of the high-side switching signal is generated in proportion to the pulse width of the input signal. The high-side switching signal enabled after the first delay time once the input signal is enabled. The low-side switching signal disabled in response to the enable of the input signal. The low-side switching signal is enabled after the second delay time once the high-side switching signal is disabled.