Mixed digital pulse duration modulater suitable for digital power supply controller
A pulse width modulator, digital power technology, applied in the direction of differential modulation, can solve the problems of low resolution, low stability, large area, etc., to achieve the effect of high resolution, guaranteed stability, and high speed
Inactive Publication Date: 2011-06-22
HEBEI ZHAORI OPTOELECTRONICS TECH
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[0008] The purpose of the present invention is to propose a new type of hybrid digital pulse width modulator suitable for digital power supply controllers, so as to overcome the shortcomings of existing digital pulse width modulators such as low stability, low speed, low resolution and large area , to meet the needs of today's digital power controllers
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[0022] The present invention will be further described below in conjunction with the accompanying drawings.
[0023] image 3 Shown is the system block diagram of the entire hybrid digital pulse width modulator. The adaptive bias voltage generation circuit 12 generates a bias voltage V with temperature process compensation ctr l47 (output terminal), connected to the control voltage input terminal 15 of the 8-stage VCO 13, to generate 16-phase clocks 29-31 (output terminal) that are not affected by process deviation and external temperature, and connected to the digital control part Input terminals 60-62; the digital control part 14 generates a modulation pulse with a resolution of n bits at the modulation pulse output port 68 according to the 16-phase clock from the 8-stage voltage-controlled loop oscillator 13 and the n-bit duty cycle 59 of the input terminal pulse. The input end of the entire hybrid digital pulse width modulator is the n-bit duty cycle input end 59 , and ...
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The invention belongs to the integrated circuit technical field, especially a mixed digital pulse modulator used in a digital supply controllers composed of an adaptive offset voltage generation circuit, a 8-stage voltage-controlled loop oscillator and a digital control part, in which, the adaptive offset voltage generation circuit generates an offset voltage Vctrl compensated by temperature technique to control the 8-stage voltage-controlled loop oscillator and a 16-phase clock C0-C15 which is not influenced by outside temperature or technical offset, and the digital control part generates a modulated pulse with the resolution of n-bit according to the 16-phase clock staggered for 1 / 16 period orderly and n-bit duty ratio input from outside d[n-1 :0]. The 16-phase clock generated by the invention is not sensitive to the technical temperature change, so that the system can keep the clock stability even under a bad work environment, further ensure the stability of the output modulation pulse; and effectively reduce the frequency of the system clock, and can avoid the problems of timing limitation and power consumption caused by the high clock frequency.
Description
technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a novel hybrid digital pulse width modulator suitable for a digital power supply controller. Background technique [0002] With the rapid development of electronic information technology, people's life has become more and more inseparable from various consumer electronic products, and a power supply with excellent performance is a prerequisite for these electronic products to play their functions. Switching power supply technology is widely used due to its advantages of high conversion efficiency and wide voltage regulation range. At the same time, the switching power supply also has the advantages of small size and light weight, and is more suitable for portable electronic products such as mobile phones, digital cameras, and notebook computers. Using switching power supply for key modules can not only prolong the battery life of the device, but also isol...
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IPC IPC(8): H03M3/04
Inventor 李舜陈华周锋
Owner HEBEI ZHAORI OPTOELECTRONICS TECH