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Control method in hysteresis controller pwm and pfm mode

A control method and controller technology, applied in control/regulation systems, instruments, output power conversion devices, etc., can solve problems such as changes in electromagnetic interference characteristics and unfavorable practical applications.

Active Publication Date: 2018-05-22
HALO MICROELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • 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 in hysteresis controller pwm and pfm mode
  • Control method in hysteresis controller pwm and pfm mode
  • Control method in hysteresis controller pwm and pfm mode

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Embodiment Construction

[0024] The following further describes the present invention with reference to the accompanying drawings and specific embodiments to facilitate a clearer understanding of the technical ideas claimed by the present invention.

[0025] In the PWM operating 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 operating frequency. Therefore, using a frequency follower to monitor the difference between the reference oscillator and the PWM operating frequency, and using this error to make corresponding parameter changes, can drive the PWM operating frequency to be fixed at the reference frequency. Figure 4 It is a functional block diagram that uses an analog phase-locked loop (PLL) circuit as a frequency follower to change the threshold interval voltage Vd of the hysteresis comparator. with figure 2 compared to, Figure 4 Added three modules:...

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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 related to the hysteresis switching power supply controller PWM and PFM mode operating frequency and output ripple control method. It provides solutions to the hysteretic mode (Hysteretic Mode) switching power supply controller in the pulse width modulation (Pulse Width Modulation, referred to as PWM) operating mode and pulse frequency modulation (Pulse Frequency Modulation, referred to as PFM) operating mode, as well as accurate mode switching process An effective method to control the operating frequency and output ripple (Ripple). Background technique [0002] PWM is the basic working mode of the switching power supply conversion circuit, which uses the ratio of the power to the switching time of the tube to adjust the output voltage. The traditional PWM controller uses a fixed frequency structure, and the PWM switching frequency is det...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156H02M1/14
CPCH02M1/14H02M3/156
Inventor 范俊陶海
Owner HALO MICROELECTRONICS CO LTD
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