Recently, according to the financial statements issued by Denso Group, a Japanese automotive parts supplier, during the period from April to December 2010 (ie the first three quarters), the company’s net profit increased 2.5 times year-on-year to 129.47 billion yen. Yen; Sales increased by a significant 11.3% year-on-year to 2.385 billion yen. With a substantial increase in sales, operating profit increased 121.4% year-on-year to 174.435 million yen; regular interest increased 101.3% year-on-year to 18.877 billion yen.

As Japan's No. 1 supplier of automotive parts, Denso said that sales in fiscal year 2010 are expected to reach 3 trillion 140 billion yen, operating profit is expected to be 2020 billion yen, and regular interest is expected to be 217 billion days. yuan. Denso said it expects net profit for the period to reach more than 147 billion yen.

Led street light, compared with the traditional lighting technology, led lamps and lanterns have higher efficiency, and longer service life.Thus become the preferred bulb type, in order to reduce the energy consumption of indoor/outdoor lighting, get energy saving effect.
For street lamps, higher efficiency and longer life are indispensable for cost reduction.Designed for the LED power supply switch power supply, also must have a high efficiency and durability, to ensure that it has as long as the LED life without maintenance.Here, the resonant converter is one of the most popular power supply topology, this is because compared with previous power supply topology, their performance has brought higher power efficiency, and can reduce EMI.Soft switch is an important characteristic of resonant converter.But the resonant converter used in parasitic diodes (bodydiode) can sometimes lead to system failure.Stored in the parasitic diodes charge must be clear, to avoid large current and voltage surge, including topology structure of high dv/dt and di/dt.

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