61results about How to "Duty cycle adjustable" patented technology

A piezoelectric energy captor enabling to capture energy and store energy effectively consists of piezoelectric beam formed by two layers of piezoelectric ceramic plates and intermediate sandwich layer, electrode prepared by plating metal silver on ceramic plate, inductance coil with control switch, bridge type of rectifier, rectifying capacitor, Cuk type of dc-dc converter formed by transistor switch and electric inductance as well as diode, filtering capacitor for stabilizing charge current, and energy storing battery.

The invention provides a semiconductor laser device driving circuit which comprises a pulse shaping circuit used for shaping a wave form of an input narrow pulse signal and further compressing the pulse width of the narrow pulse signal, and a power amplification circuit connected with the pulse shaping circuit and used for performing power amplification on the narrow pulse signal output by the pulse shaping circuit through using high voltage, and for outputting a high level of the narrow pulse signal to an anode of a laser device and a low level to a cathode of the laser device after the power amplification. According to the semiconductor laser device driving circuit, the pulse width of the narrow pulse signal is further compressed by the pulse shaping circuit, and power of the narrow pulse signal is increased by the power amplification circuit, so that the semiconductor laser device driving circuit can meet requirements of high power and a narrow pulse.

The invention provides wide-voltage electric vehicle anti-theft apparatus with a short-circuit protection and a working method, and relates to anti-theft apparatus and a working method thereof. A coil of a relay of a conventional anti-theft apparatus, which is controlled in a voltage reducing manner through a high power transistor and a large resistor, consumes electricity, has a small operating voltage range, and requires high cost; and the anti-theft apparatus cannot judge short circuit, so that once an electric vehicle is short circuited, the electric vehicle anti-theft apparatus is burnt out when electric start is conducted or an alarm is given, and fire is caused in severe cases. The electric vehicle anti-theft apparatus comprises a detection device, an anti-theft device and a control device, wherein, the control device comprises a relay. The electric vehicle anti-theft apparatus is characterized in that the control device comprises a relay control unit; the relay control unit comprises a single chip computer, a power source voltage detection circuit connected with an input port of the single chip computer, and a relay control circuit connected with a pulse width modulation signal output port of the single chip computer; and the single chip computer is provided with a pulse width computation module and a pulse width signal output module. The relay has a wide working voltage and consumes little energy; and as the anti-theft apparatus can detect short circuit, the safety performance is high.

The invention relates to a low-power-consumption, adjustable-frequency and adjustable-duty-ratio clock generation circuit. The low-power-consumption, adjustable-frequency and adjustable-duty-ratio clock generation circuit is characterized in that the circuit includes a DAC (Digital-to-Analogue Conversion) circuit, a charge pump circuit, a comparator circuit, a feedback signal generating circuit and a buffer stage circuit; the DAC circuit receives digital control signals and is electrically connected to the charge pump circuit; the charge pump circuit is electrically connected to the comparator circuit; the comparator circuit is electrically connected to the feedback signal generating circuit and the buffer stage circuit; and the buffer state circuit outputs clock signals CLK. According to the invention, stable, precise adjustable-frequency and adjustable duty-ratio clock signal output can be obtained. Besides, the charge pump circuit is simple in structure and is insusceptible to influence of technique, temperature and voltage change. The clock signal output path is extremely simple and a low signal jitter characteristic is realized.