Shenzhen Yanbao Technology Co., Ltd.

Aac Technologies (nanjing) Co., Ltd.

Aac Acoustic Technologies (shenzhen) Co., Ltd.

Meraki Integrated Circuit (shenzhen) Technology, Ltd.

Shuai Yang

Chao Wang

Jian Deng

Lirong Zhang

Ziyu Zhan

Zhiqiang Zhuang

Ke Wu

Wei Shan Dong

Lin Sheng

Boyue Luan

The present invention provides a piezoelectric film acoustic resonator, which comprises a substrate, a first electrode disposed over the substrate, a piezoelectric film disposed over the substrate and covering at least a portion of the first electrode and a second electrode disposed on a surface of the piezoelectric film away from the first electrode, one end of the first electrode extends in the direction away from the piezoelectric film to form a first extended pad, one end of the second electrode extends in the direction away from the first extended pad to form a second extended pad, the first extended pad comprises a first protruding reflection grating on the surface away from the substrate, the second extended pad comprises a second protruding reflection grating on the surface away from the substrate. The configuration can reduce the impact on acoustic performance while improving the quality factor.

Piezoelectric film acoustic resonator

The present disclosure provides a piezoelectric resonator comprising a substrate having an acoustic reflection mirror, a bottom electrode stacked on the substrate, a piezoelectric layer disposed on the substrate and covering the bottom electrode, and a top electrode stacked on a surface of piezoelectric layer distal to the bottom electrode. An overlapping portion of the acoustic reflection mirror, the bottom electrode, the piezoelectric layer, and the top electrode along a thickness direction of the piezoelectric resonator is a resonance region. A sidewall of the top electrode or a bottom electrode recesses to form a recessing portion. The recessing portion does not extend to an upper surface or a lower surface of the top electrode or the bottom electrode.

Piezoelectric resonator

An asymmetric half-bridge flyback circuit-based converter is provided. The converter is configured to convert an alternating current (AC) input at an AC input end into a direct current (DC) within a preset voltage value range. The converter includes a full-bridge rectifier circuit, a half-bridge circuit, a resonant circuit, a transformer, a load output circuit, and a control circuit.

Asymmetric half-bridge flyback circuit-based converter and control method thereof

Stylus pen

Stylus pen charger

Toothbrush head

Growing community of inventors

Shenzhen, China

Shuai Yang