US 12,214,676 B2
Current mode control type switching power supply device
Yuhei Yamaguchi, Kyoto (JP)
Assigned to Rohm Co., Ltd., Kyoto (JP)
Filed by Rohm Co., Ltd., Kyoto (JP)
Filed on Jul. 13, 2021, as Appl. No. 17/374,276.
Application 17/374,276 is a continuation of application No. 15/999,702, filed on Aug. 20, 2018, granted, now 11,097,623.
Application 15/999,702 is a continuation of application No. 14/859,676, filed on Sep. 21, 2015, granted, now 10,076,963, issued on Sep. 18, 2018.
Claims priority of application No. 2014194209 (JP), filed on Sep. 24, 2014; application No. 2014194211 (JP), filed on Sep. 24, 2014; application No. 2014194215 (JP), filed on Sep. 24, 2014; and application No. 2014194230 (JP), filed on Sep. 24, 2014.
Prior Publication US 2021/0339634 A1, Nov. 4, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. G05F 3/26 (2006.01); B60L 50/50 (2019.01); H02H 7/12 (2006.01); H02M 3/156 (2006.01)
CPC B60L 50/50 (2019.02) [G05F 3/262 (2013.01); H02M 3/156 (2013.01); H02H 7/12 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A switching power supply device comprising:
a first switch having a first terminal connected to an application terminal to which an input voltage is applied;
a second switch having a first terminal connected to a second terminal of the first switch and a second terminal connected to an application terminal to which a voltage lower than the input voltage is applied;
a controller configured to control the first switch and the second switch;
a current sense portion configured to sense a signal based on an on-resistance of the second switch;
a charging switch configured to be connected to the current sense portion and configured to, when the second switch is on, control charging of a capacitor according to the signal based on the on-resistance of the second switch; and
an accumulating portion including the capacitor configured to connect to the charging switch and configured to accumulate information according to the signal based on the on-resistance of the second switch,
wherein
the controller includes an error amplifier configured to amplify a difference between a voltage corresponding to an output voltage of the switching power supply device and a reference voltage, and
the controller controls off timing of the first switch based on a first voltage and an output voltage of the error amplifier, the first voltage being a voltage reflecting the information accumulated by the accumulating portion.
 
5. An integrated circuit comprising:
a controller configured to control:
a first switch having a first terminal connected to an application terminal to which an input voltage is applied, and
a second switch having a first terminal connected to a second terminal of the first switch and a second terminal connected to an application terminal to which a voltage lower than the input voltage is applied;
a current sense portion configured to sense a signal based on an on-resistance of the second switch;
a charging switch configured to be connected to the current sense portion and configured to, when the second switch is on, control charging of a capacitor according to the signal based on the on-resistance of the second switch; and
an accumulating portion including the capacitor configured to connect to the charging switch and configured to accumulate information according to the signal based on the on-resistance of the second switch,
wherein
the controller includes an error amplifier configured to amplify a difference between a voltage corresponding to an output voltage of a switching power supply device and a reference voltage, and
the controller controls off timing of the first switch based on a first voltage and an output voltage of the error amplifier, the first voltage being a voltage reflecting the information accumulated by the accumulating portion.
 
16. A switching power supply device comprising:
a first switch having a first terminal connected to an application terminal to which an input voltage is applied;
a second switch having a first terminal connected to a second terminal of the first switch and a second terminal connected to an application terminal to which a voltage lower than the input voltage is applied;
a controller configured to control the first switch and the second switch;
a current sense portion configured to sense a signal based on an on-resistance of the second switch;
a charging switch configured to be connected to the current sense portion and configured to, when the second switch is on, control charging of a capacitor according to the signal based on the on-resistance of the second switch; and
an accumulating portion configured to connect to the charging switch and configured to accumulate information according to the signal based on the on-resistance of the second switch,
wherein
the controller includes an error amplifier configured to amplify a difference between a voltage corresponding to an output voltage of the switching power supply device and a reference voltage, and
the controller controls off timing of the first switch based on a first voltage and an output voltage of the error amplifier, the first voltage being based on the current flowing in the second switch when the first switch is off and the second switch is on.