Abstract: Provided are an elastic wave radar detection device and method. The device includes a vibration excitation device, a first sensor, a second sensor, and a controller. The first sensor is arranged on the vibration excitation device, and the second sensor is arranged on a detected object. The first sensor is used to collect vibration excitation information, namely, an incident signal, and the second sensor is used to collect information of the detected object, namely, a vibration signal. Both the first sensor and the second sensor are connected to the controller. The elastic wave radar detection device and method provided by the present disclosure can receive vibration excitation information and introduce a standard incident signal, so as to achieve the uniformity of signals and improve the detection accuracy.

Abstract: A rectifying arrangement for an LED driver comprising a rectifying circuit and a clamping arrangement provides a low-impedance path between input terminals of the rectifying circuit in response to an abnormal operation of the rectifying arrangement, such as an open circuit of one rectifying branch of the rectifying arrangement. The low-impedance path is maintained for a plurality of cycles of an AC power supply provided to the rectifying circuit, and can be maintained on a (semi-)permanent basis.

Abstract: A retrofit lamp is for use with a fluorescence lighting ballast. The retrofit lamp comprises a filament emulation circuit. A detection circuit detects (at least) if a connected ballast is an instant start electronic ballast or an electromagnetic ballast by detecting a potentially existing heating voltage across the filament emulation circuit. In response, an LED arrangement may be connected in a series configuration (for an instant start electronic ballast) or in a parallel configuration (for an electromagnetic ballast). In this way, the output power is managed to ensure efficient operation. A different pin safety function may also be provided in the different configurations.

Abstract: A retrofit lamp is for use with a fluorescence lighting ballast. The retrofit lamp comprises a filament emulation circuit. A detection circuit detects (at least) if a connected ballast is an instant start electronic ballast or an electromagnetic ballast by detecting a potentially existing heating voltage across the filament emulation circuit. In response, an LED arrangement may be connected in a series configuration (for an instant start electronic ballast) or in a parallel configuration (for an electromagnetic ballast). In this way, the output power is managed to ensure efficient operation. A different pin safety function may also be provided in the different configurations.

Abstract: A retrofit lamp is for use with a fluorescence lighting ballast. The retrofit lamp comprises a filament emulation circuit. A detection circuit detects (at least) if a connected ballast is an instant start electronic ballast or an electromagnetic ballast by detecting a potentially existing heating voltage across the filament emulation circuit. In response, an LED arrangement may be connected in a series configuration (for an instant start electronic ballast) or in a parallel configuration (for an electromagnetic ballast). In this way, the output power is managed to ensure efficient operation. A different pin safety function may also be provided in the different configurations.