Insulation Measuring Apparatus Circuit Topology
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Solution Overview
Problem
Existing insulation measuring apparatuses using flying capacitors are costly and require extended high-voltage circuit areas, leading to increased costs and safety concerns due to the need for high-voltage insulation elements and complex discharging circuits.
Innovation Solution
The proposed insulation measuring apparatus incorporates a measuring circuit with a first capacitor, a control unit, and a switching section, along with a second capacitor between the ground and the switching section, allowing for efficient voltage setting and discharge management, eliminating the need for a separate discharging circuit and reducing the complexity of the high-voltage circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate discharging circuit with high-voltage insulation elements is used, then the capacitor can be discharged safely, but the device complexity and cost increase
Solution Approach 1:
The patent combines the discharge function with the existing measurement circuit by using the same switching elements (first and second switches) and resistors (first and second resistors) that are already present in the measurement path. The discharge path is formed by turning on the first and second switches to connect the capacitor through the first resistor to ground, eliminating the need for a separate discharging circuit with additional high-voltage insulation elements.
Solution Approach 2:
The switching elements and resistors in the circuit serve dual purposes: they are used both for measurement operations and for discharging the capacitor. The first switch and first resistor, for example, participate in both the measurement path and the discharge path, allowing a single component to perform multiple functions and reducing overall circuit complexity.
2Reliability
If high-voltage insulation elements are used in the discharging circuit, then safety is ensured, but the cost increases
Solution Approach 1:
The patent merges the discharge function into the existing measurement circuit, using the same switching elements and resistors for both measurement and discharge operations. This eliminates the need for additional high-voltage insulation elements in a separate discharging circuit, thereby reducing component count and manufacturing cost while maintaining safety through the controlled discharge path.
3Reliability
If a complex discharging circuit is implemented, then complete discharge is achieved, but the measurement time increases
Solution Approach 1:
The patent combines the discharge path with the measurement path by using the same switching elements and resistors. The discharge is achieved by turning on the first and second switches to connect the capacitor through the first resistor to ground, which provides a sufficient discharge path without requiring additional time for a separate discharge operation. This integrated approach allows complete discharge to be achieved within the existing measurement time frame.
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 configuration reduces costs, shortens measurement time, and maintains high detection accuracy while ensuring safety by eliminating the need for high-voltage insulation elements and simplifying the circuit design.
Implementation Method 1
a measuring circuit 10 having a first capacitor C1; a control means 30 for reading a voltage set on the first capacitor C1 to determine an insulation state of a power supply V
Implementation Method 2
a switching section 22, 23, 24, 25 provided in a path located between the measuring circuit 10 and the control means 30
Implementation Method 3
a second capacitor C2 provided between a ground and a path located between the switching section 22, 23, 24, 25 and the control means 30
Data Source
AI summary
An insulation measuring apparatus having a measuring circuit including a first capacitor; a control unit that reads a voltage set on the first capacitor to decide an insulation state of a power supply, and control a path configuration of the measuring circuit; a switching section provided in a path located between the measuring circuit and the control unit; and a second capacitor provided between a ground and a path located between the switching section and the control unit. The control unit controls the path configuration of the measuring circuit, by turning ON the switching section to set a voltage corresponding to the voltage that is set on the first capacitor on the second capacitor, and then by turning OFF the switching section to read the voltage set on the second capacitor and to discharge an electric charge corresponding to the voltage being set on the first capacitor.