source:Industry News Popular:adapter release time:2022-05-10 10:04:57 Article author:yu
1. Since the inductor current rises with a slope determined by Vin-Vo, the waveform responds immediately to changes in the input voltage, eliminating delayed response and gain changes with input changes...
2. Since the error amplifier now controls the current, the effect of the inductor is minimized, and the filter now only provides a single pole to the feedback loop, which both simplifies compensation and achieves higher Gain Bandwidth...
3. The inherent pulse-by-pulse current limit only needs to clamp the control signal from the error amplifier (chips like the commonly used 3843 are clamped to 1V), and it is easy to achieve load sharing when the power supplies are connected in parallel. (For example, it can alleviate the bias phenomenon of push-pull topology)
While the improvements offered by current mode have many benefits, they also have their own set of issues that must be taken into account in the design. The following briefly describes its shortcomings:
1. There are two feedback loops, which increase the man of circuit analysis;
2. When the duty cycle is greater than 50%, the control loop will become unstable, and additional slope compensation needs to be adopted;
3. Since the control modulation is based on a signal derived from the output current, resonances in the power stage can introduce noise into the control loop;
4. The current spike caused by the transformer winding capacitance and the reverse recovery current of the secondary rectifier;
5. Since the control loop is used to implement the current drive, the load regulation rate becomes poor;
6. Coupled inductors are required for multiple outputs to obtain acceptable voltage regulation.
While current-mode control will relax many of the constraints of voltage-mode control, it also presents a number of design challenges. So there are new improvements in voltage mode now. Then these two improvements are mainly voltage feedforward and high frequency capability. The former is used to eliminate the effects of voltage changes, and the latter is used to place the output filter pole at the standard control loop bandwidth. out of range.
Voltage feedforward is achieved by making the slope of the ramp waveform proportional to the input voltage. This provides a corresponding and corrected duty cycle modulation without any action by the feedback loop. A constant control loop gain and transient response to input voltage changes are obtained.
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