Intermediate-Potential Driver Stage for Lower Switching Loss

Solution Overview

Problem

Existing driver stages for capacitive, inductive, and/or resistive loads suffer from high power consumption due to switching losses, particularly during transitions between high-side and low-side potentials.

Innovation Solution

The driver stage incorporates an intermediate return-to-zero (RZ) circuit, allowing for an additional intermediate phase during operation cycles. This phase reduces the output voltage swing by connecting the output node to an intermediate potential, thereby minimizing switching losses.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If traditional 2-phase switching scheme is used, then device complexity is low, but power consumption is high due to large voltage swing

Engineering Contradiction:

Improvepower consumptionVSAvoiddevice complexity

Core Design Contradiction:

Use of energy by moving objectVSDevice complexity

Solution Approach 1:

The switching operation is segmented into three distinct phases: high-side phase, intermediate phase, and low-side phase. The voltage transition is divided into two stages (Vout=VH→Vout=VSS and Vout=VSS→Vout=VL), reducing the voltage swing in each switching event and thereby minimizing switching losses and power consumption.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

An intermediate circuit with an intermediate potential VSS is introduced as a mediator between the high-side potential VH and low-side potential VL. This intermediate potential serves as a transition state, allowing the output voltage to step through an intermediate level during switching, thus reducing the direct voltage swing and associated power losses.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Loss of energy

If intermediate RZ circuit is added, then switching losses are reduced, but device complexity increases

Engineering Contradiction:

Improveswitching lossesVSAvoiddevice complexity

Core Design Contradiction:

Loss of energyVSDevice complexity

Solution Approach 1:

The switching operation is segmented into three distinct phases: high-side phase, intermediate phase, and low-side phase. The voltage transition is divided into two stages (Vout=VH→Vout=VSS and Vout=VSS→Vout=VL), reducing the voltage swing in each switching event and thereby minimizing switching losses and power consumption.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

An intermediate circuit with an intermediate potential VSS is introduced as a mediator between the high-side potential VH and low-side potential VL. This intermediate potential serves as a transition state, allowing the output voltage to step through an intermediate level during switching, thus reducing the direct voltage swing and associated power losses.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Use of energy by moving object

If intermediate phase is introduced, then power consumption is reduced, but operation cycle time increases

Engineering Contradiction:

Improvepower consumptionVSAvoidoperation cycle time

Core Design Contradiction:

Use of energy by moving objectVSLoss of time

Solution Approach 1:

The driver stage operates in periodic cycles comprising three phases: high-side phase, intermediate phase, and low-side phase. The intermediate phase is introduced periodically during transitions to reduce switching losses, while the overall cycle time is managed to maintain acceptable operating speed.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS12323045B2Driver stage with an intermediate circuit

Publication Date: 2025.06.03 RENESAS DESIGN (UK) LTD

AI summary

A driver stage configured to switch an output node between a high-side potential and a low-side potential. The driver stage includes a high-side switch arranged between the high-side potential and the output node, a low-side switch arranged between the output node and the low-side potential, and an intermediate circuit arranged between the output node and an intermediate potential, wherein the intermediate potential lies between the high-side potential and the low-side potential. Furthermore, the driver stage includes a control unit configured to operate the driver stage at least in a high-side phase, in a low-side phase and in an intermediate phase.