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Feedforward compensated oscillator

A technology of oscillators and devices, applied in the field of feedforward compensation oscillators, can solve the problems of large chip area occupied, oscillator oscillation frequency error, low input voltage, etc., and achieve the effect of occupying a small chip area

Active Publication Date: 2014-06-25
北京中星天视科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Depend on Figure 4 It can be seen that the oscillator used for feed-forward compensation DC-DC system needs a fast comparator, because the input voltage of the positive and negative terminals of the comparator is low, usually a fold-cascode comparator structure is required, which leads to Comparator design is complex and occupies a large chip area
At the same time, in the oscillator used for feedforward compensation, the resistor R4 is relatively large, and R4 occupies a large chip area.
At the same time, due to the large delay of the comparator, the large delay included in the oscillation cycle will cause an error in the oscillation frequency of the oscillator

Method used

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Embodiment Construction

[0028] Figure 5 Is the schematic diagram of the oscillator of the present invention. The oscillator includes a current generation circuit, a comparison circuit, a current-voltage conversion circuit, a charging device, and a discharge control circuit.

[0029] The current generating circuit is connected to the power supply voltage VI N, and the current generating circuit includes a first branch that generates a current I1 that increases linearly with the power supply voltage VI N, a second branch that proportionally replicates I1 to generate a current I2, and a proportional Duplicate I1 to create a third branch of current I3. MP1, MP2 and MP3 form a current mirror, and the first branch includes MP1 and R1 for generating a charging current I1.

[0030] The comparison circuit includes MN1, MN2 and INV1, and one input terminal of the comparison circuit is connected to the oscillator output terminal RAMP for comparing the potential of the oscillator output terminal RAMP with poi...

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Abstract

The invention relates to an oscillator, in particular to a feedforward compensated oscillator. The oscillator in the invention comprises a current generating circuit, a comparison circuit, a current voltage converting circuit, a charging device and a discharging controlling circuit. The current generating circuit comprises a current mirror consisting of a transistor (MP1), a transistor (MP2) and atransistor (MP3), wherein, the current generated by the current generating circuit can be stably increased linearly along with the input voltage. One input end of the comparison circuit is used as th e output of the oscillator, and the other input end of the comparison circuit is connected with the current voltage converting circuit. In the invention, the charging device is charged by the current generating circuit and the comparison circuit compares whether the charging voltage reaches the oscillator width so as to generate sawtooth wave with oscillator width increased along with the increaseof input voltage and unchanged frequency. The oscillator in the invention has small area for occupying chip and stable frequency, and is in particular applied to various DC-DC systems required to rea lize feedforward compensation.

Description

technical field [0001] The present invention relates to an oscillator, in particular to a feed-forward compensation oscillator applied in a DC-DC converter. Background technique [0002] In the switching DC-DC converter based on the inductance structure, in order to improve the response characteristics of the DC-DC converter to the input voltage change, it is usually necessary to introduce feed-forward compensation to reduce the output voltage change caused by the input voltage change . The Buck type DC-DC converter is taken as an example below to illustrate. [0003] figure 1 It is a schematic diagram of a traditional Buck type DC-DC converter. In this traditional Buck type DC-DC converter, the oscillator output waveform is a sawtooth wave, and it satisfies VO=VIN·D, where VO is the output voltage of the DC-DC converter, VIN is the input voltage of the DC-DC converter, and D is the duty cycle of the switching signal, which is equal to the ratio of the conduction time of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/14H02M1/08
Inventor 王钊杨晓东
Owner 北京中星天视科技有限公司