DC-to-DC controller and its operation method for multi-ramp signals
A DC to DC, ramp signal technology, applied in DC power input conversion to DC power output, control/regulation systems, instruments, etc., can solve problems such as phase instability and insufficient charging time, to avoid phase instability, Avoid transient response phenomenon, avoid the effect of abnormal ramp signal
Active Publication Date: 2016-09-21
UPI SEMICON CORP
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Problems solved by technology
However, as the frequency in the circuit architecture may change or the number of phases of the multi-phase is switched, this fixed time Ramp_Tc will inevitably occupy a considerable time in the period of the ramp signal RAMP
For example, if the originally required fixed time Ramp_Tc is 100μs; when the frequency increases and one period of the ramp signal RAMP becomes 50μs, the transient response phenomenon may also be caused due to the obvious insufficient charging time. cause phase instability
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[0061] Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In addition, elements / components with the same or similar numbers used in the drawings and embodiments are used to represent the same or similar parts.
[0062]In the following embodiments, when an element is referred to as being “connected” or “coupled” to another element, it may be directly connected or coupled to the other element, or there may be intervening elements. The term "circuitry" refers to at least one element or a plurality of elements, or elements that are actively and / or passively coupled together to provide a suitable function. The term "signal" means at least one current, voltage, load, temperature, data or other signal. The ramp wave signal can also be a ramp-like signal, a triangular wave signal or a sawtooth wave signal, and it can be a ramp wave in the form of a repeating-falling wave or a ramp...
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The invention provides a DC-to-DC controller and an operation method for multi-ramp signals thereof. The DC-to-DC controller includes a ramp wave generating unit, a comparator, a logic circuit and a switch unit. The ramp generating unit alternately generates the first internal ramp signal and the second internal ramp signal. The logic circuit generates a first control signal and a second control signal according to the comparison signal of the comparator. The switch unit alternately switches one of the first internal ramp signal and the second internal ramp signal to the second input end of the comparator according to the first control signal and the second control signal. When the second internal ramp signal is switched to the comparator, the ramp generating unit charges the first internal ramp signal to the first voltage level. In another switching process, the ramp generating unit charges the second internal ramp signal to a second voltage level.
Description
technical field [0001] The present invention relates to a DC-to-DC control technology, and in particular to a DC-to-DC controller and an operation method for multi-ramp signals thereof. Background technique [0002] figure 1 is a schematic waveform diagram of an existing constant on-time circuit architecture. see figure 1 , in the existing constant on-time (Constant On Time, hereinafter referred to as COT) circuit architecture, basically a single set of ramp signal RAMP and error signal COMP are compared for signal intersection to generate an on-time signal PWM_Ton. When an on-time signal PWM_Ton for PWM starts to be calculated, the ramp signal RAMP is immediately reset and recharged to its peak voltage level. The ramp signal RAMP takes a fixed time Ramp_Tc to charge. However, as the frequency in the circuit structure may change or multi-phase phase switching is performed, the fixed time Ramp_Tc will definitely occupy a considerable time in the period of the ramp signal...
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IPC IPC(8): H02M1/088H02M3/335
CPCH02M3/156H02M3/1584
Inventor张志廉
OwnerUPI SEMICON CORP