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Control method of hysteresis controller in PWM and PFM modes

A control method and a hysteretic technology, applied in the field of analog-digital hybrid circuits and integrated circuits, which can solve problems such as changes in electromagnetic interference characteristics and unfavorable practical applications.

Active Publication Date: 2016-09-21
HALO MICROELECTRONICS CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

These changes will cause the switching ripple of the output voltage to change, and the related electromagnetic interference (EMI) characteristics will also change, which is not conducive to practical applications.

Method used

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  • Control method of hysteresis controller in PWM and PFM modes
  • Control method of hysteresis controller in PWM and PFM modes
  • Control method of hysteresis controller in PWM and PFM modes

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Embodiment Construction

[0024] In the following, the present invention will be further described in conjunction with the accompanying drawings and specific embodiments, so as to understand more clearly the technical idea claimed in the present invention.

[0025] In the PWM working mode, changing the threshold interval voltage Vd of the hysteresis comparator, or changing the slope constant K of the ramp generator, or changing both at the same time can directly change the PWM working frequency. Therefore, use a frequency follower to monitor the difference between the reference oscillator and the PWM operating frequency, and use this error to make corresponding parameter changes, so that the PWM operating frequency can be driven to be fixed at the reference frequency. Figure 4is a functional block diagram for changing the threshold interval voltage Vd of a hysteretic comparator using an analog phase-locked loop (PLL) circuit as a frequency follower. and figure 2 compared to, Figure 4 Added three m...

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Abstract

The present invention relates to a control method of a hysteresis controller in PWM and PFM modes. According to the method, the maintenance of a fixed working frequency in a PWM working mode is needed, and an output voltage ripple similar to PWM is maintained in a PFM working mode. In the PWM working mode, a frequency follower is used to monitor the difference between a reference oscillator and a PWM working frequency, an error is used to do a corresponding parameter change, and thus the PWM working frequency is driven to be fixed to a reference frequency. In the PFM working mode, through recording the actual numerical value needed by a system in the PWM mode in real time and storing the actual numerical value by using a memory unit, after the system is switched to the PFM mode, and the actual numerical value is directly called and used by a control loop. According to the method, when the system is in the PWM and PFM working modes, a determined working frequency and a determined output ripple can be ensured so as to ensure that the system conforms to the requirement of practical application.

Description

technical field [0001] The invention is a design method in the field of analog-digital hybrid circuits and integrated circuits. Specifically, the invention relates to a control method of operating frequency and output ripple in PWM and PFM modes of a hysteresis switching power supply controller. It provides a solution to the hysteretic mode switching power supply controller in the pulse width modulation (Pulse Width Modulation, referred to as PWM) working mode and pulse frequency modulation (Pulse Frequency Modulation, referred to as PFM) working mode, and the accuracy of the mode switching process. Effective way to control operating frequency and output ripple (Ripple). Background technique [0002] PWM is the basic working mode of the switching power supply conversion circuit, and the purpose of adjusting the output voltage is achieved by adjusting the ratio of the power to the switching time of the tube. Traditional PWM controllers use a fixed-frequency structure, and t...

Claims

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Application Information

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IPC IPC(8): H02M3/156H02M1/14
CPCH02M1/14H02M3/156
Inventor 范俊陶海
Owner HALO MICROELECTRONICS CO LTD
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