33results about How to "Guaranteed voltage stability" patented technology

The invention discloses an intermittent hydrogen discharge system for an anode of a fuel system and a control method of the intermittent hydrogen discharge system. The control method comprises the following steps: monitoring the voltage of a fuel cell stack and the hydrogen concentration of an anode outlet of the fuel cell stack in real time; when determining that a voltage drop value of the fuel cell stack during the period of closing anode hydrogen discharge is greater than a preset voltage drop threshold, controlling starting discharging hydrogen at the anode outlet of the fuel cell stack; and when determining that the hydrogen concentration of the anode outlet of the fuel cell stack is smaller than a preset nitrogen concentration threshold, controlling stopping discharging the hydrogen at the anode outlet of the fuel cell stack. According to the hydrogen discharge system and the control method thereof, the hydrogen utilization efficiency of the fuel cell system can be improved on the basis of maintaining the stability of the voltage of the fuel cell stack.

The invention discloses a low-power-consumption stable voltage backlight control circuit. The low-power-consumption stable voltage backlight control circuit comprises a front-end power supply circuit, a DC-DC (Direct Current-Direct Current) voltage regulating circuit, a rear end linear constant current circuit and a voltage detection circuit, wherein the front-end power supply circuit comprises a power supply circuit, a first power supply output end, a second power supply output end and a feedback circuit; the feedback circuit is used for controlling the power supply circuit to adjust voltage values of the first power supply output end and the second power supply output end according to a voltage value of a control signal input end; the DC-DC voltage adjusting circuit is used for adjusting a voltage signal output by the second power supply output end to a fixed voltage signal; the voltage detection circuit is used for switching off current passing through an LED lamp cluster when the LED lamp cluster is closed. The invention further provides a self-adapted power supply adjustable television. According to the technical scheme disclosed by the invention, the output voltage of the circuit can be controlled, supply voltage of a main board is stabilized and a phenomenon that an LED has micro-light when backlight is closed is prevented.

The invention discloses a self-disconnecting device for a computer network server, which belongs to the field of circuit protection. A self-disconnecting device for a computer network server includes a circuit controller installed at the lower end of the network server body, and the right end of the circuit controller is fixedly connected with a The self-power-off protection box electrically connected with it, the self-power-off protection box is fixedly connected with a voltage sensing controller, and the self-power-off processing can be performed through the voltage sensing controller, which can effectively ensure the voltage stability of the network server body and reduce the power consumption of the network server. If the circuit inside the main body is damaged, the self-power-off circuit protection will be carried out to reduce the economic loss of the service object, and through the cooperation of the voltage test regulation component and the test power socket, the voltage pre-detection of the repaired external power supply can be carried out, effectively avoiding the The damage to the network server body caused by mistakes is repaired, the protection degree of the circuit in the network server body is further improved, and the protection effect is enhanced.

The invention belongs to a self-inspection method and system of an optical fiber gyroscope. In order to solve the technical problem that the current closed-loop optical fiber gyroscope self-inspection method has low coverage and can only perform partial self-inspection on its functional failures, it provides an optical fiber gyroscope with a high coverage rate. Self-inspection method and self-inspection system, by accurately calibrating the digital quantity of the fiber optic gyroscope in the closed-loop feedback, and locking the calibrated self-inspection excitation signal digital quantity in the register of the FPGA self-inspection module inside the fiber optic gyroscope for the self-inspection process Simulate the angular rate of the carrier during actual flight to realize self-inspection of full-range angular rate tracking accuracy; use the closed-loop state to detect the light intensity values ​​of the non-modulated state and the modulated state, and perform difference calculation after denoising to realize the optical path self-test. Through the fiber optic gyro self-inspection, the fault status of the sensor can be accurately judged before flight, which minimizes the probability of air system failure and ensures flight safety.

The invention discloses a model predictive control method for charging electric vehicles and participating in voltage regulation. Firstly, a linear state space model of the power grid system for charging electric vehicles and participating in voltage regulation is established, and then calculated according to the preset voltage target value to obtain the prediction stage. The optimal reference curve, and then take the minimization of the deviation between the grid system voltage and the rated value and the change of the control quantity as the objective function, establish the optimization problem model of the first stage, and obtain the minimum objective function of the optimization problem model according to the optimal reference curve The optimal attainable curve can be optimized; finally, the target function is to minimize the deviation between the grid voltage, the control quantity and the given reference value, and the second-stage predictive controller model is established, and the control output is obtained according to the best attainable reference curve, and the conversion is the control increment of the power grid system, which is input to the state space model of the power grid system to control the parameters of the power grid system. The invention can simultaneously meet the electricity demand of the electric vehicle and the goal of maintaining the voltage stability of the grid.

The present invention relates to a feedback driving circuit, which comprises a channel LED current driving circuit module (003) for outputting matching currents of at least two LED channels according to a received digital signal; at least two sampling and holding circuit modules (001) , used to collect and hold the node voltages at one end of at least two LED channels respectively; the channel feedback voltage selection and error amplifier module (002) is used to determine the minimum voltage from the voltages output by the at least two sample and hold circuit modules (001), Amplify the minimum voltage and output it; the boosting driver stage circuit module (006) is used to perform a voltage step on the node voltages at the other ends of the at least two LED channels according to the channel feedback voltage selection and the output voltage of the error amplifier module (002). Adaptive adjustment. The invention ensures that the external voltage divider feedback resistance is saved without increasing the chip area, the voltage stability of the external circuit is maintained, the output voltage is optimized, and the utilization efficiency of the power supply is improved at the same time.

The invention discloses a deep-water power supply device based on a three-level inverter, which is arranged in a main base station on the seabed, and is used to convert the high-voltage direct current transmitted from the shore-based power supply to the main base station on the seabed through a submarine cable into medium-voltage electric energy. The deep water power supply device includes: a DC commutation module, a first main power conversion module, a second main power conversion module and a multi-functional load; wherein, the DC commutation module is used to receive double-terminal shore-based power and transmit it through a submarine cable The bidirectional high-voltage direct current is input into the first main power conversion module and the second main power conversion module in sequence after the input current is commutated; the first main power conversion module and the second main power conversion module are used for the input DC high voltage is used for power conversion to output DC medium voltage, which are respectively input to the multifunctional load and the main base station control cabin; the multifunctional load is used to keep the deep water power supply device running at a constant power, and is also used to control Do a self-test.

The invention discloses a reference current obtaining circuit, a read-only memory and an electronic device. The reference current obtaining circuit comprises a current mirror circuit, a switch circuit, a pull-down circuit and a pulse generation circuit, wherein the current mirror circuit is suitable for outputting a reference current according to the reference current, and comprises at least one current input branch and at least one current output branch; the at least one current input branch and the at least one current output branch are connected at a reference node; the reference current is input to the first end of the switch circuit; the second end of the switch circuit is connected with the at least one current input branch; a chip selection signal is input to the control end of the switch circuit; the chip selection signal controls the reference current to flow into the at least one current input branch; the pull-down circuit provides a discharge path to ground for the reference node; and the pulse generation circuit is suitable to control the discharge path to be switched on under the edge triggering of the chip selection signal in a preset power-on time according to the chip selection signal and to control the discharge path to be always kept switched off after the preset power-on time. The problem that the reference current provided for a sensitive amplifier in the read-only memory is instable can be solved.