Bm1z002fj-evk-001 startup evaluation

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Preface

I received it early in the morning ROHM It's from BM1Z002FJ-EVK-001 Development board .BM1Z002FJ-EVK-001 Belong to ROHM Zero crossing detection IC Star products in . Why can the modified product achieve zero crossing detection ？ The zero crossing detection can be carried out without optocoupler , Therefore, the power consumption is extremely low , The standby power consumption of the zero crossing detection circuit during normal power on can be reduced to 0.01W. in addition , When driving applications , The zero crossing detection circuit used in the past with an optocoupler AC The delay time error of voltage fluctuation is reduced to ±50µs within . Extremely low standby power consumption and minimal delay time error , So that even in different countries AC At supply voltage , It can also drive the motor efficiently , The high-precision microcontroller driver, which is difficult to realize in the past zero crossing detection circuit, is successfully realized . and , Since the optocoupler is no longer needed , It can also reduce the risk of aging , It helps to improve the reliability of products .

Advantages and usage scenarios of zero crossing detection

In order to effectively control the motor and microcontroller , Many white goods need to be configured to detect AC( communication ) Wavy 0V Potential ( Zero crossing ※ notes ) Circuit ( Zero crossing detection circuit ). In the past zero crossing detection circuit , An optocoupler is usually used , Its power consumption accounts for about% of the standby power consumption of the entire application 1/2.

In recent years , With the rapid development of Internet of things , More and more white appliances are equipped with Wi-Fi Communications functions . Since power must always be on to maintain a communication connection , And appliance manufacturers must reduce standby power consumption to 0.5W following , This will face greater challenges than ever before . at present , The improvement of standby power consumption of motor and power supply has reached the bottleneck , There is an urgent need to develop innovative technologies

New product features

1. Zero crossing detection circuit without optocoupler , It helps to greatly reduce the standby power consumption of applications

2. It helps to improve the reliability and efficiency of white goods in various countries

3. It can easily replace the previous zero crossing detection circuit

4. have “ Voltage clamping function ”, It can protect the microcontroller of the rear section

Unpacking and use

Open the express as soon as you receive it , The board is beautifully packed ROHM Of log And QR code , Open the package to see the board , And two instructions . Board length is 9.0 centimeter , Width 3.9 centimeter . The whole module uses two sides pcb Design . The circuit design is simple , The layout of components is reasonable .

Device input 90-264V AC power supply

Output is 0-4.5V The number of (DCOUT) And simulation (ACOUT) Output ,DCOUT The interface is connected to a multimeter to detect the voltage ,ACOUT You can connect the oscilloscope to check the output waveform .