| 摘要 |
An isolated power supply for protecting electrical devices from transient voltages and currents is disclosed. Specifically, the filter has a toroid (110) and resistor (102) which are used in conjunction with an isolator transformer (30). The transformer's secondary windings (124) are coupled to the electrical load (12) sought to be isolated. The primary windings (122) of the transformer are tied to an alternating current source (14) with an earth ground lead (18). The primary shield lead (138) of the transformer is tied to the earth ground lead. The secondary shield lead (134) of the transformer is also tied to the earth ground. A toroid inductor and resistor in parallel are coupled between the secondary neutral lead (68) and the secondary ground lead (70) to shunt off current or voltage spikes. The earth ground is part of a chassis which prevents spark jump insuring the isolation of the power source. The isolator thus provides equal voltage potential between the secondary lead and the primary earth ground at frequencies of less than 1 kHz.
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