US 11,658,558 B2
Zeta converter generating control power from an internal node
Kazuo Takenaka, Osaka (JP); Takashi Higashide, Osaka (JP); Katsunori Atago, Fukushima (JP); Youichi Kageyama, Osaka (JP); Hisao Hiragi, Osaka (JP); Yugo Setsu, Osaka (JP); and Hiroki Nishinaka, Osaka (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Appl. No. 17/286,902
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
PCT Filed Dec. 18, 2019, PCT No. PCT/JP2019/049641
§ 371(c)(1), (2) Date Apr. 20, 2021,
PCT Pub. No. WO2020/149084, PCT Pub. Date Jul. 23, 2020.
Claims priority of application No. JP2019-004887 (JP), filed on Jan. 16, 2019.
Prior Publication US 2021/0351692 A1, Nov. 11, 2021
Int. Cl. H02M 3/00 (2006.01); H02M 1/00 (2006.01); H02M 1/36 (2007.01)
CPC H02M 1/0006 (2021.05) [H02M 1/36 (2013.01); H02M 3/005 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A DC-DC converter comprising:
an input end;
an output end;
a switch element having one end and another and, the one end of the switching element being connected to the input end;
a coupling capacitor having one end and another end, the one end of coupling capacitor being connected to the another end of the switch element at a first node;
a first inductor having one end and another end, the one end of the first inductor being connected to the another end of the coupling capacitor at a second node, the another end of first inductor being connected to the output end at a third node;
a control circuit configured to control the switch element;
a second inductor having one end and another end, the one end of the second inductor being connected to the first node, the another end of the second inductor being connected to a ground;
a first diode having a cathode and an anode, the cathode of the first diode being connected to the second node, the anode of the first diode being connected to the ground;
a smoothing capacitor having one end and another end, the one end of the smoothing capacitor being connected to the third node, the another end of the smoothing capacitor being connected to the ground;
a comparator configured to be powered with a power voltage, and to compare a voltage at the output end with a reference voltage so as to output a comparison result to the control circuit;
a second diode having an anode and a cathode, the anode of the second diode being connected directly to the second node, the cathode of the second diode being connected directly to the comparator, the second diode being configured to supply the power voltage from the cathode to the comparator, the cathode of the second diode being configured to have a higher voltage than the output terminal; and
an output capacitor having one end and another end, the one end of the output capacitor being connected to the cathode of the second diode, the another end of the output capacitor being connected to the ground.