56results about How to "Prevent reverse charging" patented technology

The invention relates to voltage transformer protection technology, specifically to a device for preventing reverse charging of a secondary side of a voltage transformer, and solves the problem that existing voltage transformer protection technology cannot completely prevent a reverse charging phenomenon from occurring in a voltage transformer. The device for preventing reverse charging of the secondary side of the voltage transformer includes a three-phase air switch, a first spring, a lock rod, a support, a lever, a top rod, a bimetallic strip, an electric heating element, a reverse charging release, an overcurrent release, an undervoltage release, and a second spring; a right end of the first spring is fixed to a first phase moving contact of the three-phase air switch; a left part side face of the lock rod is fixed to the first phase moving contact, a second phase moving contact and a third phase moving contact of the three-phase air switch; a right end of the lock rod is provided with a first hook-shaped part; a left end of the lever is provided with a second hook-shaped part which are in a clasp joint with the first hook-shaped part; and a right end of the lever is hinged to the support. The device for preventing reverse charging of the secondary side of the voltage transformer in the invention is suitable for a power grid.

The invention provides an optimal modulation method and an optimal modulation system for a non-isolated alternating-current bypass single-phase grid-connected inverter. The method comprises the following steps: acquiring the phase angle Omega(t) of the voltage of a power grid; acquiring the phase angle Omega(t)+Beta of the output voltage of an inverter; and judging an interval, needing insertion of a dead zone, of the output voltage of the inverter according to the power factor angle Alpha and the phase angle difference Beta between the output voltage of the inverter relative and the voltage of the power grid, and inserting a dead zone between a bypass freewheeling switch and a main switch in an interval in which the output power of the inverter is negative. By using the optimal modulation method for a non-isolated alternating-current bypass single-phase grid-connected inverter provided by the invention, the problem of zero-crossing distortion caused by ignorance of inductance voltage and the problem of reverse charging caused by insertion of a dead zone for the existing modulation method are solved.

A discharge control circuit for a battery pack, comprising: a pre-discharge unit, a discharge unit, a start unit and a control unit, the input end of the pre-discharge unit is connected to the total positive end of the battery pack, the output end is connected to an external load, the input control end is connected to the control The first output control terminal of the unit is connected; the input terminal of the discharge unit is connected to the total positive terminal of the battery pack, the input control terminal is connected to the output control terminal of the starting unit, and the output terminal is connected to an external load; the first input control terminal of the starting unit It is connected with the output terminal of the discharge unit, and the second input control terminal is connected with the second output control terminal of the control unit. The control unit of the present invention controls the power MOS tube to disconnect and start the pre-discharge unit and the discharge unit, starts the pre-discharge unit to work at the moment of discharge, uses the power resistance of the pre-discharge unit to absorb the peak current, and then disconnects the pre-discharge unit to start the discharge unit , to realize the safe discharge of the battery pack to the external load.

The invention relates to a battery which can improve the safety and electric property. Said inventive safe battery is connected to a electric circuit protective board with detecting and controlling functions to make the one-time lithium battery own the functions as avoiding short circuit, instant current increase, and over-discharge without reducing the output voltage, and in special condition, the invention can supply bypass function. The invention has simple design, small size and variable position and shape of said electric circuit protective board. The invention can be used in one-time lithium battery as lithium/thionyl chloride (Li/SOCl2), lithium/chlorosulfuric acid (Li/SO2Cl2), lithium/sulfur dioxide (Li/SO2), and lithium/manganese bioxide (Li/MnO2).

The invention discloses a driving circuit of a switch unit of a reverse-connection preventing protection circuit for a solar charge controller. The driving circuit is provided with a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a diode D7, a negative-positive-negative (NPN) type triode Q6, a positive-negative-positive (PNP) type triode Q7, an NPN type triode Q8, an NPN type triode Q9 and a PNP type triode Q10. The driving circuit of the switch unit of the reverse-connection preventing protection circuit for the solar charge controller can output a driving signal through a signal output terminal DRV2; when a storage battery is connected reversely, the storage battery is prevented from being charged reversely during charge of the storage battery; and when the storage battery is not charged at night, the storage battery can be prevented from being discharged to a solar battery. The driving circuit has the advantages of simple structure and accurate detection.

The invention provides a gas pipeline system of a reaction chamber and a control method of the gas pipeline system. The gas pipeline system comprises a roughing pump connected with a reaction chamber by a butterfly damper for exhausting gas in the reaction chamber; a turbine aerating pump connected with the reaction chamber for aerating the reaction chamber, wherein a gas cooling unit of the turbine aerating pump is communicated with the roughing pump; and a valve control unit for comparing the gas pressure in the gas cooling unit with gas pressure in the reaction chamber and closing a butterfly valve when the gas pressure in the gas cooling unit is more than that of the reaction chamber. In the invention, the roughing pump always exhausts gas in the gas cooling unit when working, can reduce gas pressure in the gas cooling unit and enable the gas pressure to keep balance with the gas pressure of the reaction chamber; the valve control unit compares the gas pressures, controls opening or closing of the butterfly valve, thereby effectively preventing the cooling gas from being reversely filled to the reaction chamber.

The invention discloses a hybrid power system which comprises a fuel cell, a storage battery, a fuel cell one-way conduction module, a storage battery one-way conduction module and a one-way direct current voltage reduction module. The output end of the fuel cell is connected to a load by the fuel cell one-way conduction module; the storage battery is connected to the load by the storage battery one-way conduction module; the input end of the one-way direct current voltage reduction module is connected with the input end or the output end of the fuel cell one-way conduction module; and the output end of the one-way direct current voltage reduction module is connected with the storage battery, wherein a relationship among an input starting voltage U1, an input shutdown voltage U2 and an output voltage U3 of the one-way direct current voltage reduction module is that: U1 is greater than or equal to U2 and U2 is greater than U3. In the hybrid power system disclosed by the invention, the one-way direct current voltage reduction module is adopted between the fuel cell and the storage battery, and the one-way direct current voltage reduction module only converts and transmit a small quantity of output power of the fuel cell to the storage battery, thereby reducing a specification, a weight, cost and power consumption of the one-way direct current voltage reduction module.

The invention discloses a control device and method for an electric car driving and braking system. The device comprises a motor controller, a three-phase motor, a diode, a rectifying circuit, a super capacitor, a power battery, a thyristor triggering circuit, an inductor and a relay. In driving, when the terminal voltage of the super capacitor is higher than the voltage between an audion base electrode and a collector electrode, the relay is switched on, and the super capacitor and the power battery together drive the motor to rotate; when the terminal voltage of the super capacitor is lower than the voltage between the audion base electrode and the collector electrode, the relay is switched off, and at this moment, only the power battery conducts separate drive; and in braking, three-phase power of the motor passes through the inductor and directly charges the super capacitor through the rectifying circuit which is composed of a thyristor and the diode. In driving, the device can reduce energy output of the power battery and prevent discharge of the super capacitor when the voltage is low, and in braking, by adoption of the rectifying circuit with the thyristor, consumption of recovered energy can be reduced.

The invention discloses a secondary side parallel LCD forward converter capable of avoiding the reverse charging of an energy storage capacitor. The forward converter comprises a forward converter main circuit and an energy transfer and transmission circuit; the forward converter main circuit comprises a high-frequency transformer T, a switching tube S, a diode D1, a diode D2, an inductor L1 and acapacitor C1, and the energy transfer and transmission circuit comprises a diode D3, a capacitor C2, an inductor L2 and a diode D4. The forward converter is simple in circuit structure and high in reliability, the diode D4 ensures that C2 cannot be reversely charged, reactive power loss of the converter is reduced, the reverse recovery problem of the D4 can be eliminated, diode loss is reduced, excitation energy can be transferred to a load side, forward excitation energy can be transmitted, energy transmission efficiency is improved, and the circuit is suitable for high-power transmission.

A dynamic parallel operation circuit and method for a low-voltage household energy storage system are provided. The circuit comprises two battery pack current sampling modules and an inverter, the battery pack current sampling module comprises a battery module and a current sampling unit, one side of a positive electrode of the battery module is connected with the current sampling unit in series, the battery module comprises a battery, a discharging MOS and a charging MOS. The discharging MOS and the charging MOS are connected in series to a circuit, two battery pack current sampling modules are connected in parallel, the two ends of the parallel connection position of the battery pack current sampling modules are respectively provided with current nodes, the current nodes comprise a battery pack total positive node and a battery pack total negative node. The battery pack total positive node and the battery pack total negative node are connected with the inverter in series, the current sampling unit monitors the current condition in real time, and through cooperation of the discharging MOS and the charging MOS, parallel operation under the dynamic condition is completed, and meanwhile the problem of large-current circulation is solved.

The present invention discloses a 12V jump starter using a ternary lithium battery. The 12V jump starter using the ternary lithium battery comprises a battery pack module used for outputting a DC externally and comprising three lithium battery packs which are connected in series mutually, wherein each lithium battery pack comprises one or a plurality of ternary lithium batteries which are connected in parallel mutually; and a load end which is in series connection with the battery pack module and is used to receive the voltage of the battery pack module and output externally. The 12V jump starter using the ternary lithium battery is characterized by also comprising a relay which is in series connection between the battery pack module and the load end; a control device used for controlling the relay. By implementing the technical scheme of the present invention, the technical problem in the prior art that the 12V jump starter can not be manufactured by the ternary lithium battery can be solved, the reverse charging, the overcurrent discharging and the battery overheating of the ternary lithium battery can be prevented, and the system safety is guaranteed.

The invention discloses a charging control and protection device of a gas turbine. The device comprises a differential protector and an excitation adjuster, wherein the differential protector is provided with a first input port, a first output port and a judging control unit, the first input port is connected with a power input terminal of a power generator of the gas turbine, the first output port is connected with a power storage unit, the judging control unit is arranged between the first input port and the first output port, the judging control unit is used for controlling the engaging and disengaging of the first input port and the first output port according to the comparison result of the output voltage of the power generator and the residual voltage of the power storage unit, and the excitation adjuster is used for connecting a power output terminal of the power generator and an excitation coil of the power generator so as to control the output voltage of the power generator to supply power for the excitation coil of the power generator. The device has the advantage that the power storage unit is charged by the self power generator of the gas turbine, the consumed power of the power storage unit can be timely supplemented, and the charging circuit is timely cut off, so the reverse charging of the power generator by the power storage unit is avoided, the power generator is protected, and the over-charging of the power storage unit is prevented.

The invention relates to safe equipment, in particular to a bridge opening safety door. The bridge opening safety door comprises an electric rolling door; the electric rolling door is installed on the outer wall of abridge opening; a water level sensor is installed on the top inside the bridge opening; the water level sensor is electrically connected with a controller which is electrically connected with a relay A and a relay B, wherein a coil of the relay A is in forward connection with a tubular motor; a coil of the relay B is in reverse connection with the tubular motor; the relay A and the relay B are both electrically connected with a storage battery; the outer wall of the bridge opening is provided with a solar-cell panel; and the solar-cell panel is electrically connected with the storage battery through a solar charge controller. The bridge opening safety door completely eradicates deaths caused by waterlogging in the bridge opening, makes people who rely on luck have no chances to try, completely prevents injuries and deaths caused by waterlogging from happening again, and is suitable for nation-wide general promotion.

The invention discloses a guardrail capable of generating power and a power generation system thereof. The guardrail comprises a guardrail main body, wherein a wind driven generator is arranged on theguardrail main body. The power generation system comprises the wind driven generator arranged on the guardrail main body, wherein the wind driven generator is electrically connected with a charge-and-discharge controller through a rectifier; the charge-and-discharge controller is electrically connected with a storage battery and a direct-current load; the charge-and-discharge controller is electrically connected with an alternating-current load through an inverter; the alternating-current load is electrically connected with an auxiliary power supply; and the charge-and-discharge controller iselectrically connected with a solar photocell square matrix through an anti-backcharging blocking diode. According to the guardrail and the power generation system, the wind generated by the vehiclespeed can be used for generating power, so that the waste of energy is greatly reduced, and the environmental friendliness is facilitated; and meanwhile, the storage battery can be charged, and the power can be supplied not only for the direct-current load but also for the alternating-current load.