Phase-to-phase current balance control system for high-frequency two-phase buck converter with hysteresis control
A technology of hysteresis control and balanced control, applied in control/regulation systems, conversion of DC power input to DC power output, instruments, etc. Achieve the effect of reducing voltage ripple, small power consumption, and improving efficiency
Active Publication Date: 2022-03-25
ZHEJIANG UNIV
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[0006] In view of the above, the present invention provides a phase-to-phase current balance control system suitable for hysteretic control high-frequency two-phase Buck converters, which can work at a relatively high switching frequency, overcome various mismatch factors, and accurately measure the inductance of each phase Current, achieve equal distribution of current between phases, avoid the problem of single-phase inductance saturation caused by unbalanced current of each phase or single-phase current is too large, and compared with traditional digital control methods, the energy loss is lower and the occupied area is smaller
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[0038] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0039] Such as figure 2 As shown, the circuit structure of the phase-to-phase current balance control system of the present invention is suitable for the control chip of the high-frequency dual-phase Buck converter, and the high-frequency dual-phase Buck converter is provided with a power input pin (V IN ), the output voltage pin (V O ), ground pin (GND) and two switch SW pins (V SW1 and V SW2 ). The high-frequency dual-phase Buck converter and its control system include a reference circuit module, a main comparator module, a voltage loop module, a clock generation module, a control logic module, a ripple compensation module, a zero-delay synchronization module, and an average inductor current detection module. module, current balance module, driver ...
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The invention discloses a phase-to-phase current balance control system suitable for a hysteretic control high-frequency two-phase Buck converter, which is equipped with an average inductance current detection module in each phase, obtains the average inductance current value, and then converts the two-phase The average inductor current value is input into the current balance module to obtain the inductor current difference information. The inductor current difference information adjusts the duty cycle of the two phases in real time through the main comparator 1 and the main comparator 2, and finally balances the inductor current of the two phases. The control system of the present invention overcomes the problem of current balance under high-frequency conditions, has high detection accuracy of inductive current, good current equalization effect, relatively low energy loss and small occupied area compared with traditional digital control methods.
Description
technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a phase-to-phase current balance control system suitable for a hysteretic control high-frequency dual-phase Buck converter. Background technique [0002] A Buck converter is a DC-DC converter whose output voltage is lower than the input voltage. It is a type of switching power supply. It generally contains at least two semiconductor elements and at least one energy storage element (such as an inductor), and the output terminal is connected to a filter. ; Common Buck converter control methods include voltage mode, current mode, and hysteresis control. [0003] In recent years, the development of portable devices has put forward more requirements for Buck converters. One of the characteristics of portable devices is small size, so the power management chip inside the portable device should consider the size problem when designing. The size of passive compon...
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IPC IPC(8): H02M3/158H02M1/08
CPCH02M3/1584H02M1/08
Inventor 赵梦恋林晓清刘胜刘猛豪吴晓波
Owner ZHEJIANG UNIV