Switching mode power supply and control method thereof
View Patent ↗There is provided a switching mode power supply having primary and secondary induction coils inductively coupled to each other and converting a voltage applied to the primary induction coil to supply the converted voltage to the secondary induction coil, the switching mode power supply including a power switching unit switching the voltage applied to the primary induction coil, a load information obtaining unit obtaining load information relating to a load connected to the secondary induction coil, a bias current controlling unit controlling a switching driving current based on the load information; and a driving unit driving the power switching unit based on the load information and the switching driving current.
1. A switching mode power supply having primary and secondary induction coils inductively coupled to each other and converting a voltage applied to the primary induction coil to supply the converted voltage to the secondary induction coil, the switching mode power supply comprising:
a power switching unit switching the voltage applied to the primary induction coil;
a load information obtaining unit obtaining load information relating to a load connected to the secondary induction coil;
a bias current controlling unit controlling a switching driving current based on the load information; and
a driving unit driving the power switching unit based on the load information and the switching driving current;
wherein the load information obtaining unit outputs a load voltage;
wherein the bias current controlling unit includes:
an amplifier outputting a control current or a control voltage based on the load voltage; and
a current source controlling the switching driving current based on the control current or the control voltage.
2. The switching mode power supply of claim 1 , wherein the bias current controlling unit controls a first switching driving current, a charging current for the power switching unit, based on the load information, and controls a second switching driving current, a discharging current for the power switching unit, based on the load information.
3. The switching mode power supply of claim 1 , wherein the bias current controlling unit includes a voltage-current converter.
4. A switching mode power supply having primary and secondary induction coils inductively coupled to each other and converting a voltage applied to the primary induction coil to supply the converted voltage to the secondary induction coil, the switching mode power supply comprising:
a power switching unit switching the voltage applied to the primary induction coil;
a load information obtaining unit obtaining load information relating to a load connected to the secondary induction coil;
a bias current controlling unit controlling a switching driving current based on the load information; and
a driving unit driving the power switching unit based on the load information and the switching driving current;
wherein the load information obtaining unit outputs a load voltage;
wherein the bias current controlling unit includes:
a first amplifier outputting a first control current or a first control voltage based on the load voltage; and
a first bias current source controlling a first switching driving current, a charging current for the power switching unit, based on the first control current or the first control voltage.
5. The switching mode power supply of claim 4 , wherein the bias current controlling unit controls a first switching driving current, a charging current for the power switching unit, based on the load information, and controls a second switching driving current, a discharging current for the power switching unit, based on the load information.
6. The switching mode power supply of claim 4 , wherein the bias current controlling unit includes a voltage-current converter.
7. A switching mode power supply having primary and secondary induction coils inductively coupled to each other and converting a voltage applied to the primary induction coil to supply the converted voltage to the secondary induction coil, the switching mode power supply comprising:
a power switching unit switching the voltage applied to the primary induction coil;
a load information obtaining unit obtaining load information relating to a load connected to the secondary induction coil;
a bias current controlling unit controlling a switching driving current based on the load information; and
a driving unit driving the power switching unit based on the load information and the switching driving current
wherein the load information obtaining unit outputs a load voltage;
wherein the bias current controlling unit includes:
a second amplifier outputting a second control current or a second control voltage based on the load voltage; and
a second bias current source controlling a second switching driving current, a discharging current for the power switching unit, based on the second control current or the second control voltage.
8. The switching mode power supply of claim 7 , wherein the driving unit includes:
a pulse information generator generating first pulse information and second pulse information based on the load voltage;
an upper switch driven by the first switching driving current and the first pulse information; and
a lower switch driven by the second switching driving current and the second pulse information.
9. The switching mode power supply of claim 7 , wherein the bias current controlling unit controls a first switching driving current, a charging current for the power switching unit, based on the load information, and controls a second switching driving current, a discharging current for the power switching unit, based on the load information.
10. The switching mode power supply of claim 7 , wherein the bias current controlling unit includes a voltage-current converter.
11. A switching mode power supply having primary and secondary induction coils inductively coupled to each other and converting a voltage applied to the primary induction coil to supply the converted voltage to the secondary induction coil, the secondary induction coil for driving a load, the switching mode power supply comprising:
a power switching unit switching the voltage applied to the primary induction coil;
a load information obtaining unit coupled to the secondary induction coil for determining a load voltage relating to the load;
a bias current controlling unit including a current source configured for controlling a switching driving current based on the load voltage; and
a driving unit driving the power switching unit based on the load voltage and the switching driving current.
12. The switching mode power supply of claim 10 , wherein the driving unit includes:
a pulse information generator generating first pulse information and second pulse information based on the load voltage;
an upper switch driven by the first switching driving current and the first pulse information; and
a lower switch driven by the second switching driving current and the second pulse information.