Control circuit of power supply unit which controls output power of external power supply based upon current from the external power supply, power supply unit and control method thereof
First Claim
Patent Images
1. A control circuit of power supply unit for controlling output voltage with electric power supplied from an external power supply, comprising:
- a monitoring portion monitoring current and voltage outputted from the external power supply and the output power of the external power supply; and
a setting portion setting the upper limit value of current outputted from the external power supply based on a result of monitoring by the monitoring portion,wherein the monitoring portion includes;
a voltage detecting portion detecting that voltage value outputted from the external power supply is smaller than a lower limit value;
a current detecting portion detecting that current value outputted from the external power supply is limited by the upper limit value;
an upper limit value changing portion changing the upper limit value set by the setting portion based on a detection result of the voltage detecting portion or the current detecting portion;
an electric power calculating portion calculating a first electric power from current value and voltage value outputted from the external power supply based on the upper limit value set by the setting portion or a second electric power from current value and voltage value outputted from the external power supply based on the upper limit value changed by the upper limit value changing portion;
an electric power comparing portion determining which is larger the first electric power or the second electric power calculated by the electric power calculating portion; and
an adjusting portion, in accordance with a result of determination by the electric power comparing portion, replacing the upper limit value changed by the upper limit value changing portion with an adjustment upper limit value different from the upper limit value.
10 Assignments
0 Petitions
Accused Products
Abstract
The control circuit 30 of power supply unit and power supply unit 10 controlling output power with electric power supplied from the external power 15, comprise a monitoring portion 40 monitoring current I1 and voltage outputted from the external power supply 15 and output power of the external power supply 15 and a setting portion e1 which sets an upper limit value of current outputted from the external power supply 15 based on a monitoring result of the monitoring portion 40.
-
Citations
15 Claims
-
1. A control circuit of power supply unit for controlling output voltage with electric power supplied from an external power supply, comprising:
-
a monitoring portion monitoring current and voltage outputted from the external power supply and the output power of the external power supply; and a setting portion setting the upper limit value of current outputted from the external power supply based on a result of monitoring by the monitoring portion, wherein the monitoring portion includes; a voltage detecting portion detecting that voltage value outputted from the external power supply is smaller than a lower limit value; a current detecting portion detecting that current value outputted from the external power supply is limited by the upper limit value; an upper limit value changing portion changing the upper limit value set by the setting portion based on a detection result of the voltage detecting portion or the current detecting portion; an electric power calculating portion calculating a first electric power from current value and voltage value outputted from the external power supply based on the upper limit value set by the setting portion or a second electric power from current value and voltage value outputted from the external power supply based on the upper limit value changed by the upper limit value changing portion; an electric power comparing portion determining which is larger the first electric power or the second electric power calculated by the electric power calculating portion; and an adjusting portion, in accordance with a result of determination by the electric power comparing portion, replacing the upper limit value changed by the upper limit value changing portion with an adjustment upper limit value different from the upper limit value. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A power supply unit controlling output voltage with electric power supplied from an external power supply, comprising:
-
a monitoring portion monitoring current and voltage outputted from the external power supply and the output power of the external power supply; and a setting portion setting the upper limit value of current outputted from the external power supply based on a result of monitoring by the monitoring portion, wherein the monitoring portion includes; a voltage detecting portion detecting that voltage value outputted from the external power supply is smaller than a lower limit value; a current detecting portion detecting that current value outputted from the external power supply is limited by the upper limit value; an upper limit value changing portion changing the upper limit value set by the setting portion based on a detection result of the voltage detecting portion or the current detecting portion; an electric power calculating portion calculating a first electric power from current value and voltage value outputted from the external power supply based on the upper value set by the setting portion or a second electric power from current value and voltage value outputted from the external power supply based on the upper limit value changed by the upper limit value changing portion; an electric power comparing portion determining which is larger the first electric power or the second electric power calculated by the electric power calculating portion; and an adjusting portion, in accordance with a result of determination by the electric power comparing portion, replacing the upper limit value changed by the upper limit value changing portion with an adjustment upper limit value different from the upper limit value. - View Dependent Claims (8, 9, 10, 11, 12)
-
-
13. A control method of power supply unit controlling output voltage with electric power supplied from an external power supply, comprising:
-
monitoring current and voltage outputted from the external power supply and the output power of the external power supply; and setting the upper limit value of current outputted from the external power supply based on a result of the monitoring, wherein the monitoring comprises; detecting that voltage value outputted from the external power supply is smaller than a lower limit value; detecting that current value outputted from the external power supply is limited by the upper limit value; changing the upper limit value set by the setting the upper limit value of current based on a detection result of the detecting voltage value or a detection result of the detecting current value; calculating a first electric power from current value and voltage value outputted from the external power supply based on the upper limit value set by the setting the upper limit value of current or a second electric power from current value and voltage value outputted from the external power supply based on the upper limit value changed by the changing; determining which is larger the first electric power or the second electric power calculated by the calculating; and replacing the upper limit value changed by the changing with an adjustment upper limit value different from the upper limit value, in accordance with a result of determination by the determining which is larger the first electric power or the second electric power. - View Dependent Claims (14, 15)
-
Specification