Pulse Power Supply Transformer Reset for Short Pulse Widths
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Solution Overview
Problem
The magnetic reset circuit in pulse power supply devices requires a power supply for reset current and a restraint coil to manage induced voltage, leading to increased output impedance, making it difficult to achieve a desired pulse width.
Innovation Solution
A pulse power supply device with multiple transformers, each having primary, secondary, and tertiary windings, where the secondary windings are connected in series for output and tertiary windings in series for magnetic reset, along with an impedance changing circuit to control induced current, reducing output impedance and allowing for desired pulse widths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inductance value of the restraint coil is increased to prevent excessive current caused by induced voltage, then the power supply is protected from current damage, but the output impedance of the power supply unit increases, making it difficult to obtain an output voltage with the desired pulse width
Solution Approach 1:
The patent applies the dynamics principle by making the inductance value of the restraint coil variable rather than fixed. The inductance value is changed dynamically based on operating conditions - specifically, the restraint coil is connected in parallel with a switching element that can change the effective inductance. This allows the system to have high inductance when protection is needed and low inductance when pulse width control is prioritized, resolving the contradiction between reliability and productivity.
2Reliability
If a magnetic reset circuit is added to reduce magnetic saturation in the transformer, then magnetic reset functionality is achieved, but the device complexity increases due to additional power supply and restraint coil requirements
Solution Approach 1:
The patent applies the universality principle by designing the restraint coil to serve dual functions: it acts as both a protection element (limiting excessive current) and a magnetic reset element (reducing magnetic saturation). By making the restraint coil multi-functional, the patent avoids the need for separate dedicated circuits for each function, thereby reducing overall device complexity while maintaining the benefits of both protection and magnetic reset capabilities.
3Object-generated harmful factors
If the inductance value of the restraint coil is increased to limit induced current, then induced current is controlled, but the output impedance affects the pulse width, making it difficult to achieve desired pulse widths
Solution Approach 1:
The patent applies the dynamics principle by making the inductance value of the restraint coil variable rather than fixed. The inductance value is changed dynamically based on operating conditions - specifically, the restraint coil is connected in parallel with a switching element that can change the effective inductance. This allows the system to have high inductance when protection is needed and low inductance when pulse width control is prioritized, resolving the contradiction between reliability and productivity.
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 solution effectively reduces output impedance, enabling the generation of output voltages with desired pulse widths, including shorter pulse widths, while maintaining magnetic reset functionality.
Implementation Method 1
a transformer superimposing an induced voltage generated by the semiconductor switching element
Implementation Method 2
a magnetic reset circuit that supplies a reset current to a reset winding of a saturable reactor to reversely excite an iron core of the saturable reactor
Data Source
AI summary
A pulse power supply device includes pulse power supplies each of which outputs a monopolar pulse voltage, and transformers. The transformers include primary windings, secondary windings, and tertiary windings, and one pulse power supply is connected to one primary winding on a one-to-one basis. The secondary windings are sequentially connected in series, and a load is connected to both ends of the secondary windings. The tertiary windings are sequentially connected in series, and a magnetic reset circuit is connected to both ends of the tertiary windings. The magnetic reset circuit includes a magnetic reset power supply and an impedance changing circuit that is for limiting an induced current that can be caused to flow by a voltage induced in the tertiary windings. An impedance changing circuit is configured to be able to change an impedance.