摘要:
An easy LSB tuning method is proposed for a digitally controlled DC-DC converter to increase the DC gain of the digitally controlled DC-DC converter under conditions of no-limit-cycle and a finite bit number to reduce steady-state error of the digitally controlled DC-DC converter. The LSB of one or more of the coefficients in the denominator of the discrete-time domain transfer function of the digital compensator in the digitally controlled DC-DC converter is so tuned that the sum of all coefficients in the denominator of the discrete-time domain transfer function becomes zero. Therefore, the influence of round-off effect on the coefficients of the digital compensator is mitigated.
摘要:
An easy LSB tuning method is proposed for a digitally controlled DC-DC converter to increase the DC gain of the digitally controlled DC-DC converter under conditions of no-limit-cycle and a finite bit number to reduce steady-state error of the digitally controlled DC-DC converter. The LSB of one or more of the coefficients in the denominator of the discrete-time domain transfer function of the digital compensator in the digitally controlled DC-DC converter is so tuned that the sum of all coefficients in the denominator of the discrete-time domain transfer function becomes zero. Therefore, the influence of round-off effect on the coefficients of the digital compensator is mitigated.
摘要:
A control circuit and method for controlling a power converter comprises an adder, a digital compensator, and a pulse width modulation circuit. The adder acquires an output voltage difference between the output voltage and the reference output voltage. The digital compensator, which has a Z-domain transfer function, references the output voltage difference to generate a pulse width control signal with the least significant bits of the denominator coefficient in the Z-domain transfer function being regulated to achieve the load line function of the power converter. Further, the pulse modulation circuit is controlled by the pulse width control signal to generate the pulse width modulation signal to control ON/OFF of the power converter.
摘要:
A multi-phase buck converter has a digital compensator to select a set of compensation coefficients depending on the operating phase number of the multi-phase buck converter, or including different compensators for each operation phase number to improve the loop gain bandwidth, transient response and stability of the multi-phase buck converter. The multi-phase buck converter operates with more phase circuits for higher loading and operates with fewer phase circuits for lower loading. The compensation varies with the number of the operated phase circuits so to be adaptive to the operation condition with an optimized control-to-output voltage transfer function.
摘要:
For a multiphase interleaved voltage regulator, an offset cancellation circuit is applied for each phase separately. The current loop gain of each phase is thus increased to mitigate the beat-frequency oscillation in phase currents when the beat frequency is below the bandwidth of the low-pass filter in the offset cancellation circuit, without introducing additional instability issue that is the drawback of increasing current-sensing gain.
摘要:
A control circuit and control method for a power converter detects change of the output voltage of the converter, and performs the time-optimal control function when the change exceeds the default value. According to the voltage slew rate detected at the time of the change exceeding the default value, a time interval T1 from the change exceeding the default value being detected to the current of the inductor rising to be the same as the output current of the converter is estimated, and the time intervals T2 and T3 are figured out based on the time interval T1. The parasitic resistance of the output capacitor of the converter is taken into account during estimating process such that even if the output capacitor has larger parasitic resistance, the output voltage can be back to the steady state value accurately to avoid the time-optimal control being triggered repeatedly.
摘要:
A method for designing a digital compensator for a switching mode power supply is provided such that the digital compensator has complex conjugated zero pair or a right hand pole to eliminate the complex conjugated pole pair or right hand zero in the transfer function of the control-to-output voltage of the switching mode power supply.
摘要:
A method for designing a digital compensator for a switching mode power supply is provided such that the digital compensator has complex conjugated zero pair or a right hand pole to eliminate the complex conjugated pole pair or right hand zero in the transfer function of the control-to-output voltage of the switching mode power supply.
摘要:
A control circuit and method for a power converter controlling adaptive voltage position comprises an adder acquiring an output voltage difference between the output voltage and the reference output voltage, a digital compensator with an Z-domain transfer function to reference to the output voltage difference to generate a pulse width control signal, regulating the least significant bits of a denominator coefficient in the Z-domain transfer function such that a load line function of the power converter is performed via control of the pulse width control signal, and a pulse modulation circuit being controlled by the pulse width control signal to generate the pulse width modulation signal to control ON/OFF of power switch of the power converter. Thus, functions of controlling the negative or positive load lines and function of variable load line required by the operation of multiphase converter can be performed easily without complicated operations.
摘要:
A method for realizing QoS guarantee in a MPLS network, a method for establishing a QoS data path, a method for terminating QoS data transmission, an edge router for a MPLS network and a MPLS network for realizing QoS guarantee are provided. The method for realizing QoS guarantee in a MPLS network includes: creating individual QoS resource list in each edge router to record resource state corresponding to a path; the each edge router assigning resources to a user terminal which makes a request based on the QoS resource list and updating the QoS resource list.