Buck-boost controller based on current mode

A technology of current mode and controller, which is applied in the direction of control/adjustment system, instrument, electrical components, etc., can solve the problems of difficult seamless switching and high dynamic loss of switching, and achieve the effect of smooth seamless switching and reduced dynamic loss

CN112072916AActive Publication Date: 2020-12-11SHENZHEN INJOINIC TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-12-11

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Abstract

A buck-boost controller based on a current mode comprises a controller, a voltage feedback loop and a current sampling circuit, a drain electrode of a first switch tube is connected with a VIN input signal, a grid electrode of the first switch tube is connected with a DRV1 signal of the controller, and a source electrode of the first switch tube is connected with a drain electrode of a second switch tube; a drain electrode of a third switch tube is connected with a VOUT output signal, a grid electrode of the third switch tube is connected with a DRV3 signal of the controller, and a source electrode of the third switch tube is connected with a drain electrode of a fourth switch tube; the source electrode of the second switch tube and the source electrode of the fourth switch tube are connected with a current sampling resistor, and the grid electrode of the second switch tube is connected with a DRV2 signal of the controller; and the grid electrode of the fourth switching tube is connected with a DRV4 signal of the controller. According to the invention, smooth seamless switching from voltage boosting to buck-boost to voltage boosting is realized.
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Description

technical field

[0001] The invention relates to the field of buck-boost converters, in particular to a buck-boost controller based on a current mode. Background technique

[0002] The typical configuration of a four-switch buck-boost converter is as follows: the controller provides periodic PWM control signals, and the driver drives four switches, inductors and output capacitors respectively.

[0003] Now there are various architectures to realize the functions of the controller, such as peak current mode, average current mode. However, it is difficult for current buck-boost converters of various architectures to achieve seamless switching between boost and buck, and even switches all four switching tubes in one cycle, resulting in more switching dynamic losses.

[0004] It is not difficult to see that there are many problems in the prior art. Contents of the invention

[0005] Therefore, in order to solve the above-mentioned problems in the prior art, the present invent...

Examples

Embodiment

[0037] refer to figure 1 , figure 1 It shows a buck-boost converter composed of a controller, a voltage feedback circuit and a current sampling circuit. The buck-boost converter mainly includes two parts, namely the core controller and the voltage and current feedback loop that cooperates with the core controller , the controller outputs a DRV1 signal, a DRV2 signal, a DRV3 signal, and a DRV4 signal, and the voltage feedback loop includes a first switching tube 1, a second switching tube 2, a third switching tube 3 and a fourth switching tube 4, so The drain of the first switching tube 1 is connected to the VIN input signal, the gate of the first switching tube 1 is connected to the DRV1 signal of the controller, and the source of the first switching tube 1 is connected to the drain of the second switching tube 2; The drain of the third switching tube 3 is connected to the VOUT output signal, the grid of the third switching tube 3 is connected to the DRV3 signal of the contro...