30results about How to "Reduce residual voltage" patented technology

The invention provides materials and methods (including driving methods) for reducing the effects of remnant voltages in electro-optic displays.

A bistable electro-optic display has a plurality of pixels, each of which is capable of displaying at least three gray levels. The display is driven by a method comprising: storing a look-up table containing data representing the impulses necessary to convert an initial gray level to a final gray level; storing data representing at least an initial state of each pixel of the display; receiving an input signal representing a desired final state of at least one pixel of the display; and generating an output signal representing the impulse necessary to convert the initial state of said one pixel to the desired final state thereof, as determined from said look-up table. The invention also provides a method for reducing the remnant voltage of an electro-optic display.

An electro-optic display has a viewing surface through which a user views the display, a bistable, non-electrochromic electro-optic medium, and at least one electrode arranged to apply an electric field to the electro-optic medium, the display. The display comprises at least 10 micromoles per square meter of the viewing surface of at least one redox compound having an oxidation potential more negative that about 150 mV with respect to a standard hydrogen electrode, as measured at pH 8.

The present invention relates to a thermoplastic, multi-layer, electrostatic discharging, laminate comprised of at least one outer layer that is permanent static dissipative and non-contaminating, and a core or base layer that is conductive. The outer layer has a surface resistivity of from about 1.0x105 to about 1.0x1012 Ohm/sq, and the core layer has a surface resistivity of from about 1.0x101 to about 1.0x1011 Ohm/sq.

The present invention relates to a lighting device and its driving method. The driving method separately drives a first luminous diode and a second luminous diode to light during a first period and a second period, the driving method comprises the following steps: in the first period, outputting a driving signal with a first responsibility period so as to drive the first luminous diode; and in the first period, outputting a driving signal with a second responsibility period so as to drive the first luminous diode, wherein the second responsibility period is less than the first responsibility period. The lighting device comprises: an electrical source supply circuit for outputting a voltage; a transformer with a once side and a twice side; a first lighting unit for electrical property connecting to the twice side of the transformer; a second lighting unit for electrical property connecting to the twice side of the transformer; and a transformer switch for electrical property connecting to the transformer.

The invention brings forward a buffer circuit structure suitable for a hybrid high-voltage DC breaker bidirectional parallel load commutation switch, and a control policy. The circuit structure comprises capacitors C1p and C1n, insulation gate bipolar transistors T1p and T1n, diodes D1p to D3n and resistors R1p to R2n, wherein the collector electrode and the emitter electrode of the T1p are connected with the cathode and the anode of the D1p; one end of the R1p is connected with the emitter electrode of the T1p, and the other end is connected with a node S2; one end of the C1p is connected with the collector electrode of the T1p, and the other end is connected with the node S2; the R2p and the D2p are connected in parallel; the anode and the cathode of the D2p are connected with the cathode of the D3p and the collector electrode of T1p; the anode of the D3p is connected with a node S1; and another same buffer circuit structure is reversely connected in series between the node S1 and the node S2. The control policy of the circuit comprises control over the T1p and the T1n when a hybrid high-voltage DC breaker is disconnected and connected. The structure and control are simple, and the quick acting property and reliability of the hybrid high-voltage DC breaker are improved.

The present invention discloses a surge protection circuit. The surge protection circuit is formed by serially connecting a piezoresistor, a discharge tube and a differential mode (DM) inductor. The present invention fully utilizes characteristics of the DM inductor, effectively suppresses electromagnetic interference, and can also effectively avoid damage caused to a surge protection element by over-voltage and over-current shocks, reduce a residual voltage, and prolong the service life of a related electronic product.

The invention relates to an output voltage turning-off control method and a control circuit of a vehicle-mounted sine wave inverter, as well as the relevant vehicle-mounted sine wave inverter. The control method comprises the steps that when the vehicle-mounted sine wave inverter stops outputting, a real-time phase of output voltage is computed according to an SPWM (Sine Pulse Width Modulation) counting value; whether output voltage corresponding to the real-time phase is less than the preset voltage value is judged; if so, outputting of an SPWM wave is stopped immediately; if not, a waveform of the output voltage is further judged; if the waveform rises, the SPWM wave is output continuously after the SPWM pulse counting value is adjusted to allow the waveform of the output voltage to be changed from rising to dropping immediately; if the waveform drops, the SPWM wave is output continuously and normally; and the output voltage is monitored continuously whether the waveform rises or drops till the output voltage is less than the preset voltage value. According to the control method, the control circuit and the relevant vehicle-mounted sine wave inverter, the real-time waveform of the output voltage is monitored when the vehicle-mounted sine wave inverter stops the outputting, the output voltage is turned off by a zero voltage turning-off technology, and residual voltage at an output end is low after turning-off, so that the safety is good; no discharge resistor is required to be connected in parallel; and the product efficiency is improved.

The invention provides an antimony silicate-modified high gradient zinc oxide pressure sensitive material, which comprises the following components by weight percentage: 91 to 92 percent of ZnO, 2.65 to 2.80 percent of Bi2O3, 1.85 to 2.00 percent of Co2O3, 0.50 to 0.70 percent of MnO2, 0.40 to 0.60 percent of Cr2O3 and 2.55 to 3.00 percent of antimony silicate. A process flow for producing the antimony silicate-modified high gradient zinc oxide pressure sensitive material comprises the steps of material weighing, mixing and grinding, granulation, forming, sintering, electrode loading, lead wire welding, encapsulating, curing and testing, wherein the sintering temperature is 105 DEG C and the temperature is kept for 120 minutes. With the addition of a proper amount of antimony silicate and an optimized material mixing ratio, the zinc oxide pressure sensitive material achieves an obviously improved electric property, a plurality of excellent electric parameters and a high pressure sensitive voltage gradient. Thus, the zinc oxide pressure sensitive material meets the requirements on electric parameters of general pressure-sensitive devices and reduces raw materials at the same time. Compared with the prior general art, the zinc oxide pressure sensitive material can save 70 to 95 percent of raw materials.