Transformerless dc to ac power supply
阅读：297发布：2022-07-19
专利汇可以提供Transformerless dc to ac power supply专利检索，专利查询，专利分析的服务。并且A transformerless DC to AC power supply which comprises a piezoelectric crystal dimensioned to be resonant at a given frequency, excited to resonance by the application of a sinusoidal signal derived from a multivibrator powered by a direct-current power source. A feedback loop adapts the output of the piezoelectric crystal to synchronize the operating frequency of the multivibrator at the resonant frequency of the piezoelectric crystal.，下面是Transformerless dc to ac power supply专利的具体信息内容。
1. A DC to AC power supply comprising: a. a piezoelectric crystal having input and output terminals and dimensioned to be resonant at a given parallel resonant frequency and adapted to output an alternating electrical signal at the parallel resonant frequency; b. direct current power means for providing direct current voltage; c. a multivibrator connected to said direct current power means, said multivibrator outputting a signal alternating substantially at the parallel resonant frequency of said piezoelectric crystal and including first and second cooperating members each having an electrical signal in a predetermined phase relationship with the output signal of said piezoelectric crystal; d. means for connecting the output of said multivibrator to the input of said piezoelectric crystal; and e. feedback means for connecting a portion of the output signal of said piezoelectric crystal to the member of said multivibrator substantially in phase with the output of said piezoelectric crystal whereby the output signal of said multivibrator is substantially synchronized with the output signal of said piezoelectric crystal.
2. A DC to AC power supply as in claim 1 wherein said multivibrator is an astable multivibrator.
3. A DC TO AC power supply as in claim 2 wherein said means for connecting said astable multivibrator to said piezoelectric crystal comprises a two-stage amplifier having an output therefrom which is a sinusoidal signal, the output of said amplifier being connected to a series-resonant device adapted to output a sinusoidal signal at substantially the parallel resonant frequency of said piezoelectric crystal.
4. A high voltage AC to DC power supply comprising: a. a piezoelectric crystal dimensioned to be resonant at a given parallel resonant frequency and adapted to output an alternating electrical signal upon receipt of an excitation signal at substantially the parallel resonant frequency of said piezoelectric crystal; b. a direct current voltage source; c. an astable multivibrator adapted to output a square wave signal and having first and second semiconductor active members each having a base, emitter and collector electrodes, said first and second active members having a predetermined phase relationship with respect to each other and with respect to the output of said piezoelectric crystal; d. an amplifier having a sinusoidal output signal connected to the output of said astable multivibrator, said amplifier including a series-resonant member having an inductor and a capacitor connected to each other, the output of said amplifier being at the junction of said inductor and said capacitor, said output connected to said piezoelectric crystal providing the excitation signal thereto; e. feedback means for coupling a predetermined portion of the output signal of said piezoelectric crystal to the base of the active member of said astable multivibrator which is substantially in phase with the output signal of said piezoelectric crystal; and f. means for connecting said astable multivibrator and said amplifier to said DC voltage source.
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