4 results about "Reversed polarity" patented technology

The invention provides a high-power high-reliability voltage retainer used for an automobile starting and stopping system. The high-power high-reliability voltage retainer is higher in power and reliability and smaller in size and ripple. The high-power high-reliability voltage retainer comprises a through circuit module (1), a booster circuit module (2), a reversed polarity circuit module (3), a CAN transceiver (4), a CPU (5), a DSP (digital signal processor) (6) and a battery. A battery input port and a battery output port are formed in the through circuit module (1), a battery input port and a battery output port are formed in the booster circuit module (2), and the reversed polarity circuit module (3) is electrically connected with the booster circuit module (2); the CAN transceiver (4), the CPU (5) and the DSP (6) are sequentially and electrically connected; the CPU (5) is electrically connected with the through circuit module (1), and the DSP (6) is electrically connected with the through circuit module (1); the DSP (6) is electrically connected with the booster circuit module (2).

The invention relates to a differential Mach-Zehnder electro-optical modulator based on frequency equalization. The modulator comprises an input waveguide branch, an output waveguide branch, a Mach-Zehnder upper phase shift arm, a Mach-Zehnder lower phase shift arm and a traveling wave electrode, each phase shift arm comprises a basic modulation region, a like-polarity modulation region and a reversed-polarity modulation region which are sequentially connected in series and are spatially arranged in parallel to form a folded arrangement structure; the traveling wave electrode is used for applying a first polarity electric field to the basic modulation area and the homo-polarity modulation area, and applying a second polarity electric field opposite in direction to the reversed polarity modulation area. By adopting the scheme, frequency equalization phase modulation is realized in a compact folding structure, and the electro-optical bandwidth of the modulator can be obviously expanded while the size of the device is reduced.

The invention relates to the technical field of circuit design, in particular to a reversed polarity protection circuit, a switch module and an application circuit thereof. The reverse polarity protection circuit comprises a first NMOS tube MN1, a second NMOS tube MN2, a third NMOS tube MN3, a fourth NMOS tube MN4, a fifth NMOS tube MN5, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a first resistor R1, a second resistor R2, a third resistor R3, a fifth resistor R5, a first PMOS tube MP1 and a second PMOS tube MP2. When a reversed polarity event occurs, the power tube is actively started to form a low-resistance path to replace a body diode for conduction, so that the power consumption is greatly reduced, the gate-source and drain-source voltages of each MOS tube are in a safe range when the circuit is in all working states (normal on / off, inductive load and reversed polarity), the risk of super voltage resistance does not exist, and the circuit can be suitable for standard processes and can be used for large-scale production. And the manufacturing cost and the design complexity are reduced.

A method for electrically controlling a functional element with electrically controllable optical properties enclosed in a glazing unit includes controlling the optical properties by a control unit connected to two transparent flat electrodes of the functional element, and applying a voltage by the control unit between the flat electrodes and the polarity of the voltage is periodically changed. The voltage has a trapezoidal profile and by the control unit an increasing electrical voltage is applied for charging the functional element, the electrical voltage increasing to a first peak value, the electrical voltage is reduced from the first peak value to a final voltage for discharging the functional element, the functional element is charged with the increasing electrical voltage with reversed polarity, wherein the electrical voltage increases to a second peak value, the electrical voltage is reduced from the second peak value to the final voltage for discharging the functional element.