Abstract: A device for suppressing high-voltage electricity is connected to a three-phase circuit of an electric generator, including three up arm semiconductor switches, three low arm semiconductor switches, three reverse breakdown diodes respectively connected to the low arm semiconductor switches in parallel, and a control circuit sending PWM signals to turn on and off the low arm semiconductor switches sequentially to evenly share and absorb the energy of surge voltage. Each of the up arm semiconductor switches has a first terminal and a second terminal, wherein the first terminals are electrically connected together, and the second terminals are respectively electrically connected to one of three coils of the three-phase circuit. Each of the low arm semiconductor switches has a first terminal and a second terminal, wherein the first terminals are respectively electrically connected to the second terminals of the up arm semiconductor switches, and the second terminals are electrically connected together.

Abstract: A device for suppressing high-voltage electricity is connected to a three-phase circuit of an electric generator, including three up arm semiconductor switches, three low arm semiconductor switches, three reverse breakdown diodes respectively connected to the low arm semiconductor switches in parallel, and a control circuit sending PWM signals to turn on and off the low arm semiconductor switches sequentially to evenly share and absorb the energy of surge voltage. Each of the up arm semiconductor switches has a first terminal and a second terminal, wherein the first terminals are electrically connected together, and the second terminals are respectively electrically connected to one of three coils of the three-phase circuit. Each of the low arm semiconductor switches has a first terminal and a second terminal, wherein the first terminals are respectively electrically connected to the second terminals of the up arm semiconductor switches, and the second terminals are electrically connected together.

Abstract: A power driving device includes six semiconductor switches and three reverse breakdown diodes. The semiconductor switches has a first end and a second end respectively, and the semiconductor switches are three upper arm semiconductor switches and three lower arm semiconductor switches, wherein end first ends of the upper arm semiconductor switches are electrically connected together, and the second ends electrically connected to each coil of a three-phase coil assembly; the second ends of the lower arm semiconductor switches electrically connected together, and the first ends electrically connected to the second ends of the upper arm semiconductor switches respectively; each diode has an anode and a cathode, wherein the anodes are electrically connected to the second ends of the upper semiconductor switches respectively, and the cathodes are electrically connected to the first ends of the upper arm semiconductor switches respectively.

Abstract: The present invention provides a multi-phase rectifier of an alternator having a plurality of phases, and each of the phases include at least a positive rectifying device and at least a negative rectifying device. The negative rectifying device includes a schottky diode and a diode with reverse breakdown effect in parallel connection. An anode of the schottky diode is connected to the input port and a cathode thereof is connected to a negative terminal of the output port. Therefore, the multi-phase rectifier of the present invention may have a low power loss and protective function in high voltage.

Abstract: The torque control circuit of a hand tool contains a motor driving circuit, a current detection circuit, a reference voltage generation circuit, a current limiting circuit, and a torque configuration circuit. In the last stage of operation of the hand tool and when the average current has reached a predetermined level, the average current is maintained for a period of time to provide a constant average power and therefore to achieve an appropriate tightness of the bolt or nut being operated. The detection and control of current is achieved by a linear circuit which is robust to the heavy noises produced by the motor. A microprocessor is adopted to consider factors such as temperature in determining a suitable current level.

Abstract: A torque control circuit includes a motor driving circuit, a motor operating current detection circuit, a reference voltage generation circuit, a maximum motor current setting circuit, a torque setting circuit, an information output circuit, a regulated-voltage power supply circuit, a motor operating temperature detection circuit, and a control circuit. The control circuit includes an integrated circuit to carry out functions of reading information detection sources, processing, and instruction for execution of torque control and output terminals of the reference voltage generation circuit, the maximum motor current setting circuit, the motor operating temperature detection circuit, and the motor impedance torque setting circuit are respectively connected to corresponding input terminals of the integrated circuit to carry out desired control of torque supplied to the impact tool.

Abstract: The torque control circuit of a hand tool contains a motor driving circuit, a current detection circuit, a reference voltage generation circuit, a current limiting circuit, and a torque configuration circuit. In the last stage of operation of the hand tool and when the average current has reached a predetermined level, the average current is maintained for a period of time to provide a constant average power and therefore to achieve an appropriate tightness of the bolt or nut being operated. The detection and control of current is achieved by a linear circuit which is robust to the heavy noises produced by the motor. A microprocessor is adopted to consider factors such as temperature in determining a suitable current level.

Abstract: A torque control circuit includes a motor driving circuit, a motor operating current detection circuit, a reference voltage generation circuit, a maximum motor current setting circuit, a torque setting circuit, an information output circuit, a regulated-voltage power supply circuit, a motor operating temperature detection circuit, and a control circuit. The control circuit includes an integrated circuit to carry out functions of reading information detection sources, processing, and instruction for execution of torque control and output terminals of the reference voltage generation circuit, the maximum motor current setting circuit, the motor operating temperature detection circuit, and the motor impedance torque setting circuit are respectively connected to corresponding input terminals of the integrated circuit to carry out desired control of torque supplied to the impact tool.

Abstract: A regulator for eliminating noises generated by an automotive power generator is composed of a front-end circuit, a semiconductor power element, a resistor, and a capacitor. The front-end circuit includes a plurality of electronic components for offering control signals generated therefrom. The semiconductor power element is electrically connected with a field coil of the power generator, including a gate electrically connected with the front-end circuit for receiving the control signals that switch ON/OFF the gate. The resistor is electrically connected in series between the gate and the front-end circuit. The capacitor includes an end connected with the gate and the other end thereof grounded. Thus, the semiconductor power element can slow down the ON/OFF switching to be further low-cost and simple-circuit for enhanced quality of the output voltage of the power generator.

Abstract: An overvoltage-protective automotive power generation control circuit that is adapted for electrical connection with a field coil of an automotive power generator includes a voltage detecting circuit electrically connected with a battery-based power source mounted in a car for generating a predetermined partial voltage with respect to the battery-based power source; a driving element having a gate terminal electrically connected with the voltage detecting circuit and two conduction terminals one of which is grounded; and an opening element serially connected with the field coil of the automotive power generator and electrically connected with the other conduction terminal for open circuit upon activation and closed circuit of the driving element. Thus, the battery-based power source is prevented from overcharge and overvoltage to further prevent electronic apparatuses mounted in the car from damage incurred by the overvoltage.

Abstract: A controller built in Li-battery electric tool includes a microprocessor, a charging switch loop, a battery voltage detecting loop, a motor driving loop, and a power circuit. The charging switch loop is connected with the microprocessor and connected to a chargeable battery and a charging source, for controlling the charging status of the rechargeable battery. The battery voltage detecting loop is connected with the microprocessor for detecting the voltage of the rechargeable battery. The motor driving loop is connected with the microprocessor, having an electrically-controlled switch connected with a motor mounted inside the electric tool. The power circuit is connected with the microprocessor and the charging source, for providing the microprocessor with a power source. Thus, the rechargeable battery can be controlled while charged and discharged, and the present invention is of few components and small-sized as advantages.

Abstract: A regulator for eliminating noises generated by an automotive power generator is composed of a front-end circuit, a semiconductor power element, a resistor, and a capacitor. The front-end circuit includes a plurality of electronic components for offering control signals generated therefrom. The semiconductor power element is electrically connected with a field coil of the power generator, including a gate electrically connected with the front-end circuit for receiving the control signals that switch ON/OFF the gate. The resistor is electrically connected in series between the gate and the front-end circuit. The capacitor includes an end connected with the gate and the other end thereof grounded. Thus, the semiconductor power element can slow down the ON/OFF switching to be further low-cost and simple-circuit for enhanced quality of the output voltage of the power generator.

Abstract: A driving circuit for electrical nailing gun is disclosed to include a capacitive charging/discharging unit formed of a first resistor, a first diode, and a capacitor connected in series and connected with two opposite ends thereof to the positive and negative poles of AC power source, an excited field unit formed of a first coil and a first electrically-controlled switch connected in series and having two opposite ends connected in parallel to the capacitor, and a control unit electrically connected to the first electrically-controlled switch for activating the first electrically-controlled switch.

Abstract: A ballast includes a power unit for supplying DC, a converting unit having four switches connected to the power unit for converting DC into AC, a voltage-resistant electrocontrol switch connected to the converting unit and having at least one high-voltage diode and an electrocontrol switch, all of which are arranged in parallel, a high-voltage ignition unit connected to the voltage-resistant electrocontrol switch, a current sensor connected to the converting unit, and a control circuit connected to the converting unit, the power unit, the high-voltage ignition unit, and the voltage-resistant electrocontrol switch for manipulating the actions of the aforesaid elements, such that the ballast is in high-voltage and parallel structure. In addition, the electrocontrol switch of the voltage-resistant electrocontrol switch contains inside high-voltage-resistant insulated oil for enabling the voltage-resistant electrocontrol switch to be resistant to high voltage for AC running through.

Abstract: A driving circuit for electrical nailing gun is disclosed to include a capacitive charging/discharging unit formed of a first resistor, a first diode, and a capacitor connected in series and connected with two opposite ends thereof to the positive and negative poles of AC power source, an excited field unit formed of a first coil and a first electrically-controlled switch connected in series and having two opposite ends connected in parallel to the capacitor, and a control unit electrically connected to the first electrically-controlled switch for activating the first electrically-controlled switch.

Abstract: A battery charging and/or DC power supply circuitry employs a control circuit through an SCR drive circuit and an MOS drive circuit to control when to turn on/off a semiconductor switch unit and to turn on the semiconductor switch unit while an initial section of each positive half wave of an AC power source and an terminating section of the same are located below a predetermined level for intercepting partial power for charging. While charging a battery, the circuitry is lightweight, small-sized, and to enhance the life of the battery. While being a DC power supply, the circuitry is small-sized, high-efficiency, and low-cost.

Abstract: An electric nailing gun is disclosed to use a sensor in the nail magazine and to connect the sensor to a control circuit such that when a magazine follower is moved to a predetermined position in the nail path, the sensor sends a control signal to the control circuit to drive a counter to start counting the number of striking actions of the plunger, and the control circuit controls the electric nailing gun to reduce the plunger impact when the counting of the counter reaches a predetermined value.

Abstract: A ballast includes a power unit for supplying DC, a converting unit having four switches connected to the power unit for converting DC into AC, a voltage-resistant electrocontrol switch connected to the converting unit and having at least one high-voltage diode and an electrocontrol switch, all of which are arranged in parallel, a high-voltage ignition unit connected to the voltage-resistant electrocontrol switch, a current sensor connected to the converting unit, and a control circuit connected to the converting unit, the power unit, the high-voltage ignition unit, and the voltage-resistant electrocontrol switch for manipulating the actions of the aforesaid elements, such that the ballast is in high-voltage and parallel structure. In addition, the electrocontrol switch of the voltage-resistant electrocontrol switch contains inside high-voltage-resistant insulated oil for enabling the voltage-resistant electrocontrol switch to be resistant to high voltage for AC running through.

Abstract: A heat dissipating structure for rectifiers of car alternators includes an upper cover, a rectifier assembly disposed under the upper cover, and a heat dissipating plate disposed below the rectifier assembly. The rectifier assembly is comprised of a plurality of rectifying elements and terminals, and a heat conductive assembly for receiving the rectifying elements. One side of the respective rectifying elements are connected to the terminals to constitute a rectifier circuit. The other side of the respective rectifying elements are connected to the heat conductive assembly, which is in turn connected to the heat dissipating plate. The heat conductive assembly is comprised of a heat conductive plate to which the rectifying elements may adhere, and a ceramic heat dissipating substrate disposed between the heat conductive plate and the heat dissipating plate.