Power supply for compensating for current deviation and operating method thereof
The present disclosure relates to a communication scheme and system for converging a 5 th generation (5G) communication system for supporting a data rate higher than that of a 4 th generation (4G) system with an internet of things (IoT) technology. The present disclosure is applicable to intelligent services (e.g., smart homes, smart buildings, smart cities, smart cars, connected cars, health care, digital education, retails, and security and safety-related services) based on the 5G communication technology and the IoT-related technology. An operation method of a power supply is provided. The operation method includes calculating an inter-phase current deviation by averaging current deviations between a first phase current and a second phase current, comparing the inter-phase current deviation with a first threshold value, adjusting a pulse width modulation (PWM) duty value of at least one of a first phase and a second phase according to a result of the comparing, and compensating for inter-phase current deviation according to the adjusted PWM duty value.
1. An operation method of a power supply, the operation method comprising:
calculating an inter-phase current deviation by averaging current deviations between a first phase current and a second phase current;
comparing the inter-phase current deviation with a first threshold value;
adjusting a pulse width modulation (PWM) duty value of at least one of a first phase and a second phase according to a result of the comparing; and
compensating for the inter-phase current deviation according to the adjusted PWM duty value,
wherein the adjusting of the PWM duty value comprises:
if the inter-phase current deviation is greater than the first threshold value, calculating a duty adjustment value using the inter-phase current deviation and a first gain, and
increasing the PWM duty value of the second phase using the duty adjustment value.
2. The operation method of claim 1 , wherein the adjusting the PWM duty value further comprises:
if the inter-phase current deviation is less than a second threshold value, calculating the duty adjustment value using the inter-phase current deviation and a second gain; and
increasing the PWM duty value of the first phase using the duty adjustment value.
3. The operation method of claim 2 , wherein a sum of the first and second threshold values is 0.
4. The operation method of claim 1 , further comprising:
when the inter-phase current deviation is equal to or less than the first threshold value and equal to or greater than a second threshold value, checking whether the inter-phase current deviation is greater than 0; and
adjusting the PWM duty value of the first or second phase using a predetermined minimum duty value according to a result of the checking.
5. The operation method of claim 4 , further comprising, if the inter-phase current deviation is greater than 0, increasing the PWM duty value of the second phase using the minimum duty value.
6. The operation method of claim 4 , further comprising, if the inter-phase current deviation is equal to or less than 0, increasing the PWM duty value of the first phase using the minimum duty value.
7. The operation method of claim 1 , wherein the first phase current and the second phase current are individually obtained by converting a first-order side current value of the power supply to an average value via a sampling integration method.
8. The operation method of claim 7 , further comprising sensing the first phase current and the second phase current only during a PWM on-time.
9. The operation method of claim 8 , further comprising increasing a current sensing level using a parallel bias voltage when sensing the currents.
10. The operation method of claim 1 , wherein the power supply comprises a direct current-direct current (DC-DC) convertor or an alternating current-direct current (AC-DC) converter.
11. A power supply comprising:
a power supply unit; and
a current deviation controller configured to:
control to calculate an inter-phase current deviation by averaging current deviations between a first phase current and a second phase current of the power supply unit,
compare the inter-phase current deviation with a first threshold value,
adjust a pulse width modulation (PWM) duty value of at least one of a first phase and a second phase according to a result of the comparing, and
compensate for the inter-phase current deviation according to the adjusted PWM duty value,
wherein the current deviation controller is further configured to control to, if the inter-phase current deviation is greater than the first threshold value, calculate a duty adjustment value using the inter-phase current deviation and a first gain and increase the PWM duty value of the second phase using the duty adjustment value.
12. The power supply of claim 11 , wherein the current deviation controller is further configured to control to, if the inter-phase current deviation is less than a second threshold value, calculate the duty adjustment value using the inter-phase current deviation and a second gain and increase the PWM duty value of the first phase using the duty adjustment value.
13. The power supply of claim 12 , wherein a sum of the first and second threshold values is 0.
14. The power supply of claim 11 , wherein the current deviation controller is further configured to control to, when the inter-phase current deviation is equal to or less than the first threshold value and equal to or greater than a second threshold value, check whether the inter-phase current deviation is greater than 0 and adjust the PWM duty value of the first or second phase using a predetermined minimum duty value according to a result of the checking.
15. The power supply of claim 11 ,
wherein the first phase current and the second phase current are individually obtained by converting a first-order side current value of the power supply to an average value via a sampling integration method, and
wherein the first-order side is located at an input terminal that is not linked to any inductor or switch of the power supply.
16. The power supply of claim 11 , further comprising at least one field effect transistor (FET) implemented to sense the first phase current and the second phase current only during a PWM on-time.
17. The power supply of claim 11 , wherein the power supply unit is implemented with a direct current-direct current (DC-DC) convertor or an alternating current-direct current (AC-DC) converter.