Small Capacitance Compensation Network Circuit for Power Control

Solution Overview

Problem

Existing compensation network technologies in power control circuits are costly and unreliable, particularly due to the need for large external capacitors and dedicated pins in integrated circuits, which can lead to system failures in high temperature and humidity environments.

Innovation Solution

A small capacitance compensation network circuit utilizing switch modules, capacitors, amplification modules, and a voltage-controlled current source to alternately charge and discharge capacitors, eliminating the need for external compensation capacitors and integrated circuit pins by controlling the switch states to process capacitance deviations and generate accurate error signals.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If a large compensation capacitor is used to achieve stability during power frequency cycle, then the system stability is improved, but the circuit cost and occupied space increase

Engineering Contradiction:

Improvesystem stabilityVSAvoidoccupied space

Core Design Contradiction:

Stability of the object's compositionVSArea of stationary object

Solution Approach 1:

The patent merges the compensation capacitor function with internal circuit components by connecting the compensation capacitor to the inverting input terminal of the operational amplifier, which is also the output terminal of the error amplifier. This integration allows the compensation capacitor to work in conjunction with internal resistors and amplifiers, achieving stable operation during power frequency cycles without requiring a large external capacitor.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The compensation capacitor serves multiple functions simultaneously: it provides frequency compensation for stability, acts as part of the error signal generation circuit, and works with the operational amplifier to regulate output voltage. This multi-functionality reduces the need for separate large-capacitor components while maintaining system stability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Stability of the object's composition

If a large compensation capacitor is used to achieve stability during power frequency cycle, then the system stability is improved, but the circuit cost increases

Engineering Contradiction:

Improvesystem stabilityVSAvoidcircuit cost

Core Design Contradiction:

Stability of the object's compositionVSEase of manufacture

Solution Approach 1:

The patent merges the compensation capacitor function with internal circuit components by connecting the compensation capacitor to the inverting input terminal of the operational amplifier, which is also the output terminal of the error amplifier. This integration allows the compensation capacitor to work in conjunction with internal resistors and amplifiers, achieving stable operation during power frequency cycles without requiring a large external capacitor.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The compensation capacitor serves multiple functions simultaneously: it provides frequency compensation for stability, acts as part of the error signal generation circuit, and works with the operational amplifier to regulate output voltage. This multi-functionality reduces the need for separate large-capacitor components while maintaining system stability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Stability of the object's composition

If an external compensation capacitor is used in traditional compensation network, then the basic stable error signal within power frequency cycle is achieved, but the reliability decreases due to leakage current in high temperature and humidity environment

Engineering Contradiction:

Improveerror signal stabilityVSAvoidsystem reliability

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent extracts the compensation function from external components and integrates it into the internal circuit architecture. By connecting the compensation capacitor to the inverting input terminal of the operational amplifier and utilizing internal resistors and amplifiers, the system achieves stable error signals without relying on external capacitors that are susceptible to leakage current in high temperature and humidity environments.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The operational amplifier serves as an intermediary that mediates between the compensation capacitor and the error signal output. The inverting input terminal of the operational amplifier acts as a node that receives feedback from the output terminal and processes the compensation capacitor's effect, producing a stable error signal without requiring external components that may fail in harsh environments.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 reduces system costs, improves reliability by integrating the compensation capacitor within the circuit, and eliminates the risk of leakage current, thereby enhancing the stability of power supplies.

Implementation Method 1

a voltage-controlled current source; an output end of the voltage-controlled current source, a second end of the resistor R2 and a second end of the second amplification module are jointly connected

Methodology Applied

Scientific EffectVoltage-controlled current source:

Implementation Method 2

the electrical signal output by the reference current source is amplified by the first amplification module and then charges the capacitor C1

Methodology Applied

Scientific EffectSignal amplification:

Implementation Method 3

the first switch module and the second switch module are alternately switched between the switched-off state and the switched-on state

Methodology Applied

Scientific EffectElectrical switching:

Implementation Method 4

when the first switch module is switched off and the second switch module is switched on, the capacitor C1 charges the compensation capacitor C3

Methodology Applied

Scientific EffectCapacitor charging: Capacitance

Implementation Method 5

when the third switch module is switched on and the fourth switch module is switched off, the compensation capacitor C3 is discharged to charge the capacitor C2

Methodology Applied

Scientific EffectCapacitor discharging: Capacitance

Data Source

PatentUS10496116B2Small capacitance compensation network circuit

Publication Date: 2019.12.03 SHENZHEN WINSEMI MICROELECTRONICS

AI summary

A small capacitance compensation network circuit, the first switch module (201) and the second switch (202) module are alternately switched between a switched-off state and a switched-on state, so that the compensation capacitor C3 is charged by the capacitor C1; and the third switch module (203) and the fourth switch module (204) are alternately switched between the switched-off state and the switched-on state, so that the compensation capacitor C3 is discharged to charge the capacitor C2, by controlling the alternate switch-on of the first switch module (201) and the second switch module (202), the third switch module (203) and the fourth switch module (204) causes the deviation of the capacitor C1 and the capacitor C2 to be processed and obtain the error signal. Therefore, the compensation capacitor C3 can be designed to be very small, which facilitates the integration of the integrated circuit, eliminates the need for external compensation capacitors and integrated circuit pins, reduces the system cost, and improves the reliability. Therefore, it is solved the problem that the existing compensation network technology has high cost in the power control circuit and poor reliability in the power supply.