Switching power input and battery automatically with P-Channal MOSFET

I am going to design a circuit that uses a battery as a power source. And an adapter as the input power. So I need a circuit that switches the power source automatically from battery to input power. And I do not want to add a chip to do this because it will increase the cost of the board.

The simple circuit for that could be:
The shortcoming of this circuit is that it will consume some power by the diode D1 when the adapter plugs in.  In order to overcome this, a P-MOSFET is used to replace it.
The simulation showed it works well. I will test it later.

评论

发表评论

此博客中的热门博文

High side switch with P-Channal MOSFET

图片
Recently, I am designing a circuit that needs to switch off a module from 12V by a 5V control signal. So I do some research work and make desicion to use the circuit as below. The simulation result as below. The real components in the design list as below. P-Channel MOSFET:  TPH1R712MD (RDSon:1.35mOhms)
阅读全文

How to Program XMC Mcu with XMCFlasher

图片
1. Download XMCFlasher from website of Infineon .  Or use this link XMCFlasher ； 2. Install Oracle Java8 JRE . If it is not yet installed in your system. 3. Install the latest Segger JLink software . 4. Extract the folder XMC™ Flasher to the preferred location. Double click on XMCFlasher.jar, Click on Connect and select which mcu you are going to program. If some error happen. Maybe it because the BMI set is not correct. You can set the BMI mode by click on the BMI on menu. Click Select File button to select which program is going to program. Usually the file is locate in the \Debug or \Release subfolder under your project folder depends on you set of project. After that, click Program button, the mcu will programmed. If you have several board to program, click Connect button when you change a board and click Program Button. I found in some computer, when you run XMCFlasher.jar. It will show an error. Even I reinstall Java, the error is still there. But When I
阅读全文