D-C Voltage converter for a wristwatch
First Claim
1. An electronic wristwatch provided with a low voltage d-c supply source and an electronic circuit having a high-frequency time base whose output is coupled to a multi-stage frequency divider whose output stage yields low-frequency timing pulses to actuate a time display, and a converter which functions to increase the voltage of the source to a level sufficient to energize the electronic circuit, said converter comprising:
- (A) a transformer having a primary and a secondary;
(B) a periodically-actuated chopper interposed between the source and the primary whereby an a-c voltage is induced in the secondary;
(C) a rectifier circuit connected to the secondary and having at least one controllable switch element; and
(D) means to derive intermediate frequency pulses from an intermediate stage of the divider to govern the on-off state of said switch element in synchronism with the periodically-actuated chopper to cause said element to effect rectification of the a-c voltage.
2 Assignments
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Accused Products
Abstract
A d-c converter for inclusion in a miniature electronic device, such as an electronic wristwatch having a d-c supply source, the converter functioning to increase or decrease the voltage of this source. The converter includes a transformer whose primary is connected to the source through a periodically-actuated chopper to produce an alternating voltage, the secondary of the transformer being connected to a rectifier circuit having at least one controllable switch element whose on-off state is governed in synchronism with the chopper whereby the switch element acts to rectify the secondary voltage.
7 Citations
15 Claims
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1. An electronic wristwatch provided with a low voltage d-c supply source and an electronic circuit having a high-frequency time base whose output is coupled to a multi-stage frequency divider whose output stage yields low-frequency timing pulses to actuate a time display, and a converter which functions to increase the voltage of the source to a level sufficient to energize the electronic circuit, said converter comprising:
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(A) a transformer having a primary and a secondary; (B) a periodically-actuated chopper interposed between the source and the primary whereby an a-c voltage is induced in the secondary; (C) a rectifier circuit connected to the secondary and having at least one controllable switch element; and (D) means to derive intermediate frequency pulses from an intermediate stage of the divider to govern the on-off state of said switch element in synchronism with the periodically-actuated chopper to cause said element to effect rectification of the a-c voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification