Power conversion apparatus for pulse current
a technology of power conversion apparatus and pulse current, which is applied in the direction of pulse technique, process and machine control, instruments, etc., can solve the problems of slow dynamic response of switching power converter, low power conversion efficiency of circuits, and large circuit footprint, and achieve fast response to changes, high power conversion efficiency, and high power density
Inactive Publication Date: 2006-06-15
NAT CHENG KUNG UNIV
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Benefits of technology
"The present invention provides a power conversion apparatus for pulse current that has improved stability and dynamic response. It includes a linear power conversion circuit and a switching power conversion circuit that work together to strengthen the load current and make it more stable during sudden changes. The apparatus also includes a switching DC / AC converter for converting AC power into DC power. The linear power conversion circuit can adjust the output voltage to match the load current, and the switching power conversion circuit can supply a stable power to the workpiece. Overall, the invention provides a more efficient, powerful, and compact power conversion apparatus for pulse current."
Problems solved by technology
However, since the gap for electrical discharging needs to be very small and since the tool and the workpiece are constantly being etched away during machining, discharging quickly ceases because the gap widens.
Since the linear power converter is used as the main structure in the conventional power conversion apparatuses for electrical discharge machining, the output voltage and current are adjusted by using power resistor D or power transistor E working in the active region to make the voltage big enough to discharge to the workpiece A. Hence, these circuits each have low power conversion efficiency and a large circuit footprint; therefore, they are unfavorable in the industry.
If the switching power converter is used alone, although high power conversion efficiency and a smaller size can be achieved, desirable load current cannot be obtained, causing the slow dynamic response of the switching power converter.
In summary, the power conversion efficiency of the linear power converters is not sufficient, so the size of the power conversion apparatus of the machine becomes quite big.
Moreover, although using the switching power converter alone can improve the power conversion efficiency and decrease the size of the power conversion apparatus, it cannot effectively improve its dynamic response to a sudden change in load current.
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[0032] In order to make the illustration of the present invention more explicit and complete, the following description is stated with reference to FIGS. 5 to 11.
[0033] Reference is made to FIG. 5, illustrating a power conversion apparatus for pulse current according to the preferred embodiment of the present invention. The power conversion apparatus for pulse current according to the preferred embodiment of the present invention comprises a linear power conversion circuit 3 and a switching power conversion circuit 4 wherein the linear power conversion circuit 3 and the switching power conversion circuit 4 are set in parallel. The linear power conversion circuit 3, electrically connected to an outer power supply 2, supplies a load current and strengthens the dynamic response to sudden changes in the load current. The switching power conversion circuit 4, electrically connected to the outer power supply 2, strengthens the load current by phase-shifting to make the load current have ...
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The present invention discloses a power conversion apparatus for pulse current suitable for electrical discharge machining. The power conversion apparatus comprises a linear power conversion circuit and a switching power conversion circuit. The linear power conversion circuit offers a fast response to changes in output load and is used to adjust the output voltage. The magnitude or the waveform of the current through the workpiece is adjusted by the power resistor or the power transistor. Then, the switching power conversion circuit supplies the workpiece a stable power to make the power conversion apparatus output a stable pulse current to achieve the goal of high power conversion efficiency, high power density, and small size.
Description
RELATED APPLICATIONS [0001] The present application is based on, and claims priority from, Taiwan Application Serial Number 93138844, filed Dec. 15, 2004, the disclosure of which is hereby incorporated by reference herein in its entirety. FIELD OF THE INVENTION [0002] The present invention relates to a power conversion apparatus for pulse current, and more particularly, to a power conversion apparatus having a linear power conversion circuit and a switching power conversion circuit to improve the efficiency of power conversion, decrease the size of the apparatus, and supply stable voltages and currents to meet the demands of electrical discharge machining (EDM). BACKGROUND OF THE INVENTION [0003] Electrical machining involves machining metal materials by melting them in electrolyte or by directly etching them by electricity. Electrical discharge machining (EDM) is a non-contact machining method; that is, there is always a gap between the tool and the workpiece such that there is no ...
Claims
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IPC IPC(8): G05F1/40G05F1/618
CPCB23H1/022H02M3/1584H02M2001/007H03K17/6871H02M1/007
InventorLIN, RAY-LEE
OwnerNAT CHENG KUNG UNIV