High Voltage Start-Up Circuit Enable Control for Zero Standby Power

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Solution Overview

Problem

Existing high voltage start-up circuits have high standby input power consumption and current, leading to energy waste and being unsuitable for applications requiring extremely low standby power consumption or current.

Innovation Solution

A high voltage power system with enable control, comprising a high voltage start-up circuit, a PWM control module, and a driving module, where the entire system is controlled by a pin EN to enter a zero standby state, reducing standby power consumption and current by shutting off the high voltage start-up circuit, PWM control module, and driving module when not in use.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the high voltage start-up circuit and power supply are kept in working state during standby mode, then the system can respond quickly when activated, but the standby input power consumption becomes rather large (over 50 mW) and standby input current becomes rather large (over 300 μA)

Engineering Contradiction:

Improvesystem response speedVSAvoidstandby input power consumption

Core Design Contradiction:

SpeedVSUse of energy by moving object

Solution Approach 1:

The patent applies dynamics by making the system state changeable between working mode and standby mode through the enable pin EN. The high voltage start-up circuit and power supply can dynamically switch between active and inactive states, allowing the system to adapt its power consumption characteristics based on operational requirements while maintaining quick response capability when activated.

Inventive Principle:

Principle #15Dynamics

2Speed

If the high voltage start-up circuit and power supply are kept in working state during standby mode, then the system can respond quickly when activated, but the standby input current becomes rather large (over 300 μA)

Engineering Contradiction:

Improvesystem response speedVSAvoidstandby input current

Core Design Contradiction:

SpeedVSQuantity of substance

Solution Approach 1:

The enable pin EN controls the dynamic state of the system, allowing it to switch between working and standby modes. In standby mode, the high voltage start-up circuit and power supply are turned off, reducing input current to near-zero levels while maintaining the capability to quickly resume operation when EN is activated.

Inventive Principle:

Principle #15Dynamics

3Use of energy by moving object

If the high voltage start-up circuit is shut off to reduce standby power consumption, then standby input power consumption becomes extremely low (less than 15 mW), but the system cannot respond quickly without proper initialization

Engineering Contradiction:

Improvestandby input power consumptionVSAvoidsystem response speed

Core Design Contradiction:

Use of energy by moving objectVSSpeed

Solution Approach 1:

The enable pin EN is configured to initiate the start-up sequence when activated. The high voltage start-up circuit performs preliminary actions by charging the external capacitor C1 connected to pin VDD through transistor M1, ensuring the system is properly initialized and ready for operation. This preliminary charging action enables quick system response when transitioning from standby to working mode.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically transitions from standby to working mode through the enable pin EN. When EN is activated, the high voltage start-up circuit quickly charges the external capacitor C1, and the power supply transitions from inactive to active state, achieving fast system response despite being in low-power standby mode previously.

Inventive Principle:

Principle #15Dynamics

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

The system achieves extremely low standby input power consumption (less than 15 mW) and current (less than 60 μA), suitable for applications needing minimal power usage, thereby reducing energy waste and enhancing flexibility.

Implementation Method 1

the transistor M1 is conductive, and a relatively large flow of current IHV from the pin HV of the power supply chip charges the external capacitor C1 connected with the pin VDD quickly

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 2

the transistor M3 is conductive, and the potential of the gate of the transistor M1 is pulled low, and the transistor M1 is off

Methodology Applied

Scientific EffectTransistor switching:

Implementation Method 3

the transistor M4 is conductive, and the potential of the gate of the transistor M1 is pulled low, and the transistor M1 is off, and the current IHV is reduced to zero

Methodology Applied

Scientific EffectTransistor switching:

Data Source

PatentUS10038437B2High voltage power system with enable control

Publication Date: 2018.07.31 WUXI CHIPOWN MICROELECTRONICS

AI summary

Disclosed is a high voltage power system with enable control, comprising a high voltage start-up circuit, a PWM control module, and a driving module; the high voltage start-up circuit comprises a first transistor, a third transistor, a fourth transistor, a resistor, a diode, a VDD detection unit and an I/O interface unit; the high voltage start-up circuit is controlled by an input of a pin EN; when the pin EN is set, the high voltage start-up circuit stops working; the power system is shut off and doesn't restart, and enters a zero standby state; when the pin EN is reset, the high voltage start-up circuit restores to work, and the power system restarts and enters a normal working state. The power system having the high voltage start-up circuit with enable control has characteristics that the standby input power consumption and standby input current are both close to zero.