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Buck-Boost converter with output current compensation branch

A technology of output current and converter, which is applied in the field of Buck-Boost converter, can solve problems such as poor pulsating current tolerance, performance impact, and reduced circuit dynamic response speed, etc., to achieve efficiency improvement, low output voltage ripple, and improved The effect of the output voltage ripple

Pending Publication Date: 2019-08-30
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, common aluminum electrolytic capacitors have poor tolerance to pulsating current, and their performance is seriously affected by temperature; common filters (such as: LC filters) will reduce the dynamic response speed of the circuit

Method used

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  • Buck-Boost converter with output current compensation branch
  • Buck-Boost converter with output current compensation branch
  • Buck-Boost converter with output current compensation branch

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] refer to figure 1 , a Buck-Boost converter with an output current compensation branch, including an N-channel MOS transistor M1, an inductor L1, a diode D1, a capacitor Co, an output current compensation branch and a controller, the current compensation branch has a port a, port b, port c, port d, port gc and port sc, the controller has port g1, port s1, port gc and port sc, the positive end of the DC power supply Vi and the drain of the N-channel MOS transistor M1 The source of the N-channel MOS transistor M1 is simultaneously connected to one end of the inductor L1, the port c of the output current compensation branch and the cathode of the diode D1, and the anode of the diode D1 is simultaneously connected to the port d of the output current compensation branch and the capacitor Co One end of the capacitor Co is connected to one end of the load RL, and the other end of the capacitor Co is connected to the other end of the load RL, the port b of the output current com...

Embodiment 2

[0046] refer to figure 1 , image 3 and Figure 6 , a Buck-Boost converter with an output current compensation branch, the output current compensation branch includes an inductor Lb1, an inductor Lb2, an NPN BJT transistor Qb1, a diode Db1 and a resistor Rb1, and the emitter of the NPN BJT transistor Qb1 is simultaneously It is connected to port c and port sc of the output current compensation branch, the base of the NPN type BJT tube Qb1 is connected to one end of the resistor Rb1, and the other end of the resistor Rb1 is connected to the port gc of the output current compensation branch, and the NPN type BJT tube Qb1 The collector of the inductor Lb1 is connected to one end of the inductor Lb1, the other end of the inductor Lb1 is connected to the port a of the output current compensation branch, one end of the inductor Lb2 is connected to the port d of the output current compensation branch, and the other end of the inductor Lb2 is connected to the port of the diode Db1 T...

Embodiment 3

[0052] refer to figure 1 , Figure 4and Figure 6 , a Buck-Boost converter with an output current compensation branch, the output current compensation branch includes an inductor Lc1, an inductor Lc2, an N-channel MOS transistor Mc1, and a diode Dc1 to a diode Dc3, the cathode of the diode Dc1 is connected to the output current compensation The port c of the branch is connected, the anode of the diode Dc1 is connected with one end of the inductor Lc1 and the anode of the diode Dc2 at the same time, the cathode of the diode Dc2 is connected with the port b of the output current compensation branch, and the other end of the inductor Lc1 is connected with the output current compensation branch The port sc of the circuit, one end of the inductor Lc2, and the source of the N-channel MOS transistor Mc1 are connected, the drain of the N-channel MOS transistor Mc1 is connected to the port a of the output current compensation branch, and the gate of the N-channel MOS transistor Mc1 I...

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Abstract

The invention relates to a Buck-Boost converter with an output current compensation branch. The Buck-Boost converter comprises an N-channel MOS (metal oxide semiconductor) tube M1, an inductor L1, a diode D1, a capacitor Co, an output current compensation branch and a controller, in the output current compensation branch, when the N-channel MOS tube M1 is cut off, part of a current is shunted fromthe inductor L1 through a port a of the output current compensation branch for energy storage, and the inductor L1 forms a loop with the port a and a port c of the output current compensation branch;when the N-channel MOS tube M1 is conducted, energy is released through the port b of the output current compensation branch, the current is provided for the capacitor Co and the load RL, and the capacitor Co and the load RL form a loop with the port b and the port d of the output current compensation branch; the controller adopts a soft switch controller, controls the switching state of the N-channel MOS tube M1 through a port g1 and a port s1 of the controller, and controls the working state of energy storage or release of the output current compensation branch through a port gc and a portsc of the controller. The Buck-Boost converter has the characteristic of low output voltage ripple.

Description

technical field [0001] The invention relates to a Buck-Boost converter, in particular to a Buck-Boost converter with an output current compensation branch, which is suitable for the application occasion of low output voltage ripple. Background technique [0002] The output current of the traditional Buck-Boost converter (referring to the current from the output terminal to the freewheeling diode) is discontinuous, and this characteristic will lead to a large output voltage ripple. To obtain a smaller output voltage ripple, the usual method is to increase the capacity of the output electrolytic capacitor or add a filter. However, common aluminum electrolytic capacitors have poor tolerance to pulsating currents, and their performance is seriously affected by temperature; common filters (such as: LC filters) will reduce the dynamic response speed of the circuit. [0003] Therefore, consider introducing an output current compensation branch for the traditional Buck-Boost conver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158H02M1/14
CPCH02M3/1582H02M1/143H02M1/0058Y02B70/10
Inventor 谢路耀陈怡周丹
Owner ZHEJIANG UNIV OF TECH
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