A bidirectional power conversion circuit

Abstract

The invention discloses a bidirectional power conversion circuit, which improves the utilization rate of devices and reduces the quantity of semiconductor devices by integrating charge and discharge control circuits into one circuit. During the charging process, the energy of the external adapter is converted into the rechargeable battery through the linear mode; during the discharge process, the energy of the rechargeable battery is converted into the electric energy required by the load through the discharge mode, realizing the bidirectional energy conversion of the circuit. Moreover, the bidirectional power conversion circuit of the present invention has the functions of anti-reverse charging, anti-short circuit, and overvoltage discharge. The bidirectional power conversion circuit of the invention has the beneficial effects of high integration, small volume and complete functions.

Description

technical field [0001] The invention relates to the field of power electronics, more specifically, to a bidirectional power conversion circuit. Background technique [0002] Now more and more portable products use mobile charging power. The mobile charging power first needs to store the energy of the external power supply such as the adapter in the rechargeable battery of the power supply, such as a lithium battery. When it needs to be discharged, the mobile charging power supply controls the internal control circuit. Next, the energy in the rechargeable battery is converted into the energy required by the load. [0003] The use of bidirectional DC conversion is the first choice for the power conversion circuit of the mobile charging power supply. In the prior art, the above-mentioned electric energy conversion is usually carried out through the charging control module and the discharging control module, and each module needs independent peripheral components to realize. The...

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Problems solved by technology

[0003] The use of bidirectional DC conversion is the first choice for the power conversion circuit of the mobile charging power supply. In the prior art, the above-mentioned electric energy conversion is usually carried out through the charging control module and the discharging control module, and each module needs independent peripheral components to realize. The whole circuit integration is relatively Complicated and costly to control

In addition, in the prior art, when the voltage at the input port of the charger is lower than the voltage of the rechargeable battery, the battery will be reversely charged and discharged, resulting in energy loss; again, if the discharge output is short-circuited, the rechargeable battery may be discharged directly to the ground

Finally, the bidirectional DC conversion in the prior art is rarely equipped with an output overvoltage protection function. When the feedback loop fails, the output voltage may exceed the maximum limit voltage and cause system damage.

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