Power supply system for an electromagnetic riveting apparatus
First Claim
1. A voltage charging circuit apparatus for charging a first plurality of capacitors which are connected together to form a first capacitor bank, comprising:
- a first AC capacitor having one side thereof connected to one end of a power source; and
a first diode circuit comprising a first diode connected between the other side of the AC capacitor and the other end of the power source and a first element having a diode function connected between said other side of the AC capacitor and one end of the first capacitor bank, wherein the other end of the power source is connected to the other end of the first capacitor bank, the first AC capacitor and the first diode circuit defining a first charging doubler module, wherein the first charging doubler module in operation facilitates charging of the capacitor bank to a selected charge voltage and acts as a voltage doubler relative to the power source.
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Accused Products
Abstract
The power supply, useful with an electromagnetic force apparatus such as a riveter or a bolt inserter, includes two capacitor banks which are charged through charging doubler modules. Each charging doubler module includes an AC capacitor which is responsive to a power source. The AC capacitor is connected to a node point between two diode elements, which are connected in series across the capacitor bank. An analog-to-digital converter converts the voltage on the capacitor bank to a digital voltage for comparison with a selected digital charge voltage in a controller. The selected digital charge voltage may vary over time by means of a compensating algorithm. A ground fault indicator using a biasing voltage is connected between a selected electrical circuit portion of the force apparatus and earth ground. A gas discharge tube in combination with a current sensing element is connected to the capacitor banks to determine a possible overvoltage condition. A Hall-effect sensor is mounted between bus connections which carry the current between the capacitor bank and a coil portion of the electromagnetic force apparatus to determine the current flowing into the coil by measurement of the magnetic field between the bus bars.
32 Citations
45 Claims
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1. A voltage charging circuit apparatus for charging a first plurality of capacitors which are connected together to form a first capacitor bank, comprising:
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a first AC capacitor having one side thereof connected to one end of a power source; and a first diode circuit comprising a first diode connected between the other side of the AC capacitor and the other end of the power source and a first element having a diode function connected between said other side of the AC capacitor and one end of the first capacitor bank, wherein the other end of the power source is connected to the other end of the first capacitor bank, the first AC capacitor and the first diode circuit defining a first charging doubler module, wherein the first charging doubler module in operation facilitates charging of the capacitor bank to a selected charge voltage and acts as a voltage doubler relative to the power source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. An apparatus for controlling the charge voltage for a capacitor bank in an electromagnetic force apparatus which includes a charging circuit for charging the capacitor bank, wherein the capacitor bank comprises a plurality of connected capacitors, the apparatus comprising:
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an analog-to-digital converter for converting the analog voltage present at the capacitor bank to a corresponding digital voltage during charging of the capacitor bank by the charging circuit; a controller having stored therein a selected digital charge voltage, the controller including means for comparing said digital voltage from the analog-to-digital converter with the selected charge voltage and further includes means responsive to said comparing means to control the charging circuit such that the voltage thereon reaches the selected charge voltage; and means for transmitting said digital voltage from the analog-to-digital converter to the controller. - View Dependent Claims (44, 45)
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Specification