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An adaptive external synchronous dc/dc converter with pll latch function

A DC converter, self-adaptive technology, applied in the direction of output power conversion device, DC power input conversion to DC power output, instruments, etc., can solve the problems that the external synchronization function cannot be realized, and there is no internal oscillator circuit, etc., to achieve The effect of saving area, novel circuit design and fast response speed

Active Publication Date: 2019-03-15
昌芯(西安)集成电路科技有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The DC / DC converter corresponding to the valley current control mode with fixed turn-on time does not have a dedicated internal oscillator circuit. According to the above-mentioned PLL latch function circuit structure, the external synchronization function cannot be realized.

Method used

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  • An adaptive external synchronous dc/dc converter with pll latch function
  • An adaptive external synchronous dc/dc converter with pll latch function
  • An adaptive external synchronous dc/dc converter with pll latch function

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Embodiment Construction

[0029] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0030] like image 3As shown, the adaptive external synchronous frequency DC / DC converter with latch function of the present invention includes a reference voltage source 101, an error amplifier 102 directly connected to the reference voltage source 101, and a compensation network 113 connected to the error amplifier 102. , the PWM comparator 103 connected to the output end of the error amplifier 102 and the output end of the inductor current sampling circuit 109, the phase / frequency discriminator circuit 104, the voltage-to-current circuit 105 connected to the output end of the phase / frequency discriminator, and The turn-on time generation circuit 106 connected to the voltage-to-current circuit 105, the logic drive circuit 107 directly connected to the turn-on time generation circuit 106 and the output end of the PWM comparator 103, the logic drive circuit 107 is con...

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Abstract

The invention discloses an adaptive external synchronization DC / DC converter with a PLL latch function. The converter includes a frequency locking module, an inductive current sampling control module, and a logic operation driving module. The frequency locking module includes a phase demodulation / frequency discriminator which compares phase differences between an applied frequency and frequency of an upper pipe drive signal in a power tube circuit, and regulates the time when the upper pipe drive signal is at a high level state in the power tube circuit. The inductive current sampling control module acquires an inductive current in an inductance circuit, and regulates the time when the upper pipe drive signal is at a low level state in the power tube circuit through in inductive current sampling circuit, an error amplifier and a PWM comparator. According to the invention, when working under an applied frequency, the converter can achieve synchronization of a working frequency and an inductive frequency of the DC / DC converter without requiring a specific internal oscillator circuit to generate frequency signals.

Description

technical field [0001] The invention belongs to the technical field of electronic equipment, and relates to a DC / DC converter, in particular to an adaptive external synchronous DC / DC converter with a PLL latch function. Background technique [0002] A DC / DC converter is a device that converts one input DC voltage into another stable DC output voltage. It has the advantages of high efficiency and high precision, so it is widely used in various battery-powered electronic equipment, communication equipment, power supplies, etc. . The external synchronous DC / DC converter with PLL latch function can work according to the frequency added by the user (within a certain frequency range), which brings greater convenience to the user, so it has been paid more and more attention. [0003] When designing a DC / DC converter with PLL latch function, the most critical issue is to synchronize the operating frequency of the DC / DC converter with the applied frequency. Synchronization means tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156
CPCH02M3/156
Inventor 赵盼盼唐文海代国定吴雷潘鹏飞
Owner 昌芯(西安)集成电路科技有限责任公司