US 12,463,645 B2
Level shifter, drive circuit, switching power supply device, and vehicle
Isao Takobe, Kyoto (JP)
Assigned to Rohm Co., Ltd., Kyoto (JP)
Filed by ROHM CO., LTD., Kyoto (JP)
Filed on Feb. 15, 2024, as Appl. No. 18/442,800.
Claims priority of application No. 2023-024227 (JP), filed on Feb. 20, 2023.
Prior Publication US 2024/0283455 A1, Aug. 22, 2024
Int. Cl. B60R 16/03 (2006.01); H02M 1/08 (2006.01); H02M 3/158 (2006.01); H03K 19/0185 (2006.01)
CPC H03K 19/018507 (2013.01) [B60R 16/03 (2013.01); H02M 1/08 (2013.01); H02M 3/158 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A level shifter, comprising:
a first signal generator configured to generate a first binary signal in response to an input signal;
a second signal generator configured to generate a second binary signal in response to the first binary signal;
a third signal generator configured to generate a third binary signal in response to the second binary signal,
wherein the first signal generator and the second signal generator are further configured to use a first internal voltage, which is based on a first voltage, as an upper-side power supply voltage when the first voltage is higher than a second voltage, and use a second internal voltage, which is based on the second voltage, as the upper-side power supply voltage when the second voltage is higher than the first voltage,
wherein the third signal generator is further configured to use the second voltage as an upper-side power supply voltage,
wherein the first signal generator is further configured to use a third internal voltage, which is based on a third voltage, as a lower-side power supply voltage when the third voltage is higher than a fourth voltage, and use a fourth internal voltage, which is based on the fourth voltage, as the lower-side power supply voltage when the fourth voltage is higher than the third voltage,
wherein the second signal generator and the third signal generator are further configured to use the fourth voltage as the lower-side power supply voltage, and
wherein the third voltage is lower than the first voltage and the fourth voltage is lower than the second voltage; and
a lower-side power supply configured to generate the third internal voltage and the fourth internal voltage,
wherein the lower-side power supply includes a third diode having an anode to which the third voltage is applied, and a fourth diode having an anode to which the fourth voltage is applied, and
wherein each cathode of the third diode and the fourth diode is connected to the first signal generator.