Tunable DC voltage generating circuit

Patent metadata

Field	Value
Publication number	US-9825525-B2
Application number	US-201715587154-A
Country	US
Kind code	B2
Filing date	May 4, 2017
Priority date	Feb 4, 2016
Publication date	Nov 21, 2017
Grant date	Nov 21, 2017

Abstract

A tunable DC voltage generating circuit includes: a resonance circuit including an inductor and an input capacitor coupled in a series connection, and arranged to operably receive an input signal and to operably generate a resonance signal at an output node between the inductor and the input capacitor; a rectifying circuit coupled with the output node and arranged to operably rectify the resonance signal; a current control unit coupled with an input of the rectifying circuit and coupled with the inductor or the input capacitor in a parallel connection; a stabilizing capacitor coupled with an output of the rectifying circuit and arranged to operably provide a DC output signal having a voltage level greater than that of the input signal; and a control circuit arranged to operably adjust a current passing through the current control unit according to a setting signal to thereby manipulate the DC output signal.

First claim

What is claimed is:

1. A tunable DC voltage generating circuit ( 300 ), comprising:
a resonance circuit ( 110 ) comprising an inductor ( 111 ) and an input capacitor ( 113 ) coupled in a series connection, and arranged to operably receive an input signal (VIN) and to operably generate a resonance signal (VLC) at an output node ( 115 ) between the inductor ( 111 ) and the input capacitor ( 113 );
a rectifying circuit ( 120 ), coupled with the output node ( 115 ), arranged to operably rectify the resonance signal (VLC);
a current control unit ( 130 ), coupled with an input of the rectifying circuit ( 120 ), and coupled with the inductor ( 111 ) or the input capacitor ( 113 ) in a parallel connection;
a stabilizing capacitor ( 140 ), coupled with an output of the rectifying circuit ( 120 ), arranged to operably provide a DC output signal (VOUT) having a voltage level greater than that of the input signal (VIN); and
a control circuit ( 150 ), coupled with the current control unit ( 130 ) and the output of the rectifying circuit ( 120 ), arranged to operably adjust a current passing through the current control unit ( 130 ) according to a setting signal (VSET) to thereby manipulate the DC output signal (VOUT).

2. The tunable DC voltage generating circuit ( 300 ) of claim 1 , wherein the input signal (VIN) is an AC signal or a pulsed DC signal, not a fixed-voltage DC signal.

3. The tunable DC voltage generating circuit ( 300 ) of claim 1 , wherein the current control unit ( 130 ) comprises a tunable resistor or a transistor, and an equivalent resistance of the current control unit ( 130 ) is controlled by the control circuit ( 150 ).

4. The tunable DC voltage generating circuit ( 300 ) of claim 3 , wherein the control circuit ( 150 ) comprises:
a feedback circuit ( 151 ), coupled with an input of the stabilizing capacitor ( 140 ), arranged to operably generate a feedback signal (FB) corresponding to the DC output signal (VOUT); and
a comparator ( 153 ), coupled with the feedback circuit ( 151 ) and the current control unit ( 130 ), arranged to operably compare the feedback signal (FB) with the setting signal (VSET) to adjust the equivalent resistance of the current control unit ( 130 ).

Assignees

• Richtek Technology Corp

Inventors

• Liu Kuo-Chi
• Wei Wei-Hsin

Classifications

• H02M7/06

  using discharge tubes without control electrode or semiconductor devices without control electrode · CPC title

• H02M2001/0054

  Electricity · mapped topic

• H02M3/1588

  comprising at least one synchronous rectifier element (H02M3/1582, H02M3/1584 take precedence) · CPC title

• H03H7/38

  Impedance-matching networks · CPC title

• H02M3/158

  including plural semiconductor devices as final control devices for a single load · CPC title