Secure Power Supply Device Voltage Selection Circuit

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Solution Overview

Problem

Existing secure power supply systems are inefficient due to the need for large charge storage capacitors, which result in longer charging and discharging times and increased power consumption, while also being vulnerable to hackers detecting power characteristics for unauthorized data extraction.

Innovation Solution

A power supply device comprising a secure power supply, a stable voltage source, and a voltage selection circuit that dynamically adjusts the driving voltage for an encryption/decryption device by combining supply voltage and stable voltage when the driving voltage falls below a threshold, reducing the reliance on large capacitors and minimizing power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If a large charge storage capacitor is used to ensure sufficient charge supply during encryption/decryption, then the charge supply capability is improved, but the charging and discharging time increases and power consumption increases

Engineering Contradiction:

Improvecharge supply capabilityVSAvoidcharging and discharging time

Core Design Contradiction:

Quantity of substanceVSLoss of time

Solution Approach 1:

The power supply system is divided into two independent power sources: a secure power supply device for providing supply voltage and a stable voltage source for providing stable voltage. This segmentation allows each power source to be optimized independently, eliminating the need for a large charge storage capacitor while ensuring both charge supply capability and fast response time.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent combines the secure power supply device and the stable voltage source into a unified power supply system that serves the encryption/decryption device. The two power sources work together through a voltage selection device, merging their advantages to provide both sufficient charge supply and fast response without requiring a large capacitor.

Inventive Principle:

Principle #5Merging (Combining)

2Quantity of substance

If a large charge storage capacitor is used to ensure sufficient charge supply during encryption/decryption, then the charge supply capability is improved, but the power consumption increases

Engineering Contradiction:

Improvecharge supply capabilityVSAvoidpower consumption

Core Design Contradiction:

Quantity of substanceVSUse of energy by moving object

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

3Reliability

If the power pins and ground pins are isolated from external pads to prevent side attacks, then the security is improved, but the power supply stability may be affected

Engineering Contradiction:

ImprovesecurityVSAvoidpower supply stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent introduces a stable voltage source as an intermediary power source that works in conjunction with the secure power supply device. This intermediary provides additional stability to the driving voltage without requiring direct external connections, thus maintaining both security (isolation from external pads) and power supply stability.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The stable voltage source acts as a pre-prepared backup power source that can immediately compensate for any voltage fluctuations or disruptions. This beforehand cushioning ensures power supply stability is maintained even when the secure power supply device operates in isolation from external pads for security reasons.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 solution effectively reduces the size, operation time, and power consumption of the charge storage capacitor, while preventing hackers from obtaining secure information through power characteristics, enhancing the security and efficiency of the power supply system.

Implementation Method 1

a charge storage capacitor CS

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS20230099825A1Power supply device, method and secure system

Publication Date: 2023.03.30 NUVOTON

AI summary

A power supply device is provided with a secure power supply device, a voltage detection circuit, a stable voltage source and a switch. By using the voltage detection circuit, whether a driving voltage of an encryption/decryption device is insufficient to control the on and off the switch, so as to determine whether only the secure power supply device provides a supply voltage to the encryption/decryption device as the driving voltage. Alternatively, the supply voltage of the secure power supply device and a stable voltage of the stable voltage source are provided simultaneously to the encryption/decryption device as the driving voltage. In other words, once the driving voltage drops (that is, the encryption/decryption device consumes a large current for encryption/decryption), the stable voltage source immediately provides the stable voltage to the encryption/decryption device as part of the driving voltage to ensure that the encryption/decryption device can normally work.