60results about How to "Avoid the impact of high current" patented technology

The invention discloses a controller of a current vortex retarder and a control method. The controller comprises a first processing unit, a second processing unit, a power driver and a CAN bus, wherein the first processing unit and the second processing unit are both connected with the CAN bus to ensure that the first processing unit outputs a control signal according to a received operating switch signal, the control signal is sent to the second processing unit through the CAN bus, and the second processing unit controls the on-off time sequence of the stator coil of the current vortex retarder through the power driver. The CAN bus is used for the transportation of data so as to simplify the wiring structure, increase the safety and the reliability for the control of the retarder, realize the real-time communication and display in the work state and realize the information sharing or control between vehicles.

The invention provides an intelligent switch which comprises a load switch, an operating mechanism, a position state indicator, an upper disconnecting switch, a lower disconnecting switch, a current transformer, a first potential transformer, a second potential transformer, an electronic switch, a charging module, a battery and an intelligent device, wherein the load switch is connected on a main circuit and located between the upper disconnecting switch and the lower disconnecting switch; the electronic switch is connected with the load switch in parallel; the current transformer is sleeved on a branch circuit where the load switch is located; and the load switch and the electronic switch are connected in parallel. The first potential transformer and the second potential transformer are respectively connected with the charging module and can charge the battery from two sides; the intelligent device is connected to the current transformer and the charging module, and the battery can provide direct current supply for the intelligent device and the operating mechanism; the battery is connected with the charging module; the operating mechanism is connected with the load switch; and the indicator is connected with the operating mechanism. The invention also provides a control method of the intelligent switch.

The invention discloses a supercapacitor three-stage charging circuit comprising a Buck converter circuit, a current sampling circuit, a charging mode control circuit and a charging driving circuit. A supercapacitor is connected with the output end of the Buck converter circuit. The current sampling circuit is connected with the Buck converter circuit. The charging mode control circuit is connected with the output end of the current sampling circuit, the supercapacitor and the reference voltage output end of the charging driving circuit. The charging driving circuit is connected with the output end of the charging mode control circuit and the output end of the current sampling circuit. The Buck converter circuit is connected with the PWM signal output end of the charging driving circuit. The invention also discloses a supercapacitor quick charging method of the supercapacitor three-stage charging circuit. The supercapacitor three-stage charging circuit is convenient to implement and low in cost so that charging speed of the supercapacitor can be enhanced, working stability and reliability are high, the charging and discharging performance of the supercapacitor can be effectively protected and practicality is high.

The invention discloses a hybrid electric vehicle composite power supply for self-adapting filter power dividing control and a self-adapting filter power dividing control method. The composite power supply comprises a storage battery, a super capacitor and a bidirectional DC/DC (Direct Current/Direct Current) convertor, wherein the storage battery is connected with a power bus to be used as a main power supply; the super capacitor is connected with the power bus by the bidirectional DC/DC converter and is connected with the bidirectional DC/DC converter in series to form an auxiliary power supply. The self-adapting filter power dividing control method is used for controlling the bidirectional DC/DC converter. The super capacitor in the composite power supply is used for carrying out power compensation on the storage battery so as to prevent from providing instantaneous power and peak power by the battery; the whole efficiency of the composite power supply is obviously improved; the super capacitor can be used for rapidly and efficiently charging and discharging by large current and regenerative braking energy is recycled to the greatest extent; the self-adapting filter power dividing control method realizes the reasonable distribution of power, guarantees that all parts of the composite power supply are efficient obtains the good control effect.

The invention discloses a super capacitor multi-mode quick charge circuit design method, which comprises the following steps: 1) selecting resistance of a resistor RS; 2) enabling one end of the resistor RS to be connected with the cathode output end of a Buck convertor circuit, and enabling the other end of the resistor RS to be grounded; 3) selecting elements having appropriate parameters and forming a charging mode control circuit; 4) connecting the elements to form the charging mode control circuit; 5) selecting elements having appropriate parameters and forming a charging drive circuit; 6) connecting the elements to form the charging drive circuit; and 7) connecting the Buck convertor circuit, a voltage source, a super capacitor and the charging drive circuit to form a super capacitor multi-mode quick charge circuit. The method is simple in steps, reasonable in design, convenient to realize, high in practicality and convenient for popularization use.

The invention discloses a passive series composite power source braking energy recovery system. The passive series composite power source braking energy recovery system comprises a storage battery, a motor, a motor controller, a rectifier bridge, a supercapacitor, diodes, a switch and a controller. During regenerative braking, a three-phase counter electromotive force only charges the supercapacitor through the rectifier bridge, and the storage battery dose not participate in energy recovery; in the driving process, the storage battery is in series connection with the supercapacitor to output electric energy; through the diodes in parallel, the battery is prevented from conducting reverse charging on the supercapacitor; the system can be switched to be in storage battery single driving mode, and thus energy consumption of an output current on the diodes during long-time outputting is avoided; the controller controls switching of the switch, the strict requirements during switching are avoided, that is, zero-current switching can be conducted in a non-driving state; and the controller continuously detects the voltage at the supercapacitor end, the voltage of the storage battery, and the braking vehicle speed, and sends a PWM signal to control on-off of a thyristor in the rectifier bridge, direct current chopping of a braking current is achieved, and the electric braking deceleration is controlled. The passive series composite power source braking energy recovery system utilizes the rectifier bridge to recover braking energy, and the energy utilization rate is increased.

The invention provides methods and devices for controlling synchronous pre-synchronization and synchronization detection closing of a microgrid. The control method comprises the steps of: adjusting the voltage magnitude output by a main support power supply at a tracking side through iteration, so that the voltage magnitude at the tracking side successively approximates the voltage magnitude at areference side along with iteration till the absolute value of a difference value between the voltage magnitude at the tracking side and the voltage magnitude at the reference side is less than or equal to a first pre-set threshold value; adjusting the frequency output by the main support power supply at the tracking side through iteration, so that the frequency at the tracking side successively approximates the frequency at the reference side along with iteration till the absolute value of a different value between the frequency at the tracking side and the frequency at the reference side isless than or equal to a second preset threshold value; and, adjusting the phase output by the main support power supply at the tracking side through iteration, so that the phase at the tracking side successively approximates the phase at the reference side along with iteration till the absolute value of a different value between the phase at the tracking side and the phase at the reference side isless than or equal to a third preset threshold value, therefore, voltage synchronization of the tracking side and the reference side is realized.

The invention discloses a multi-output power management circuit which is in communication connection with an upper computer, wherein the upper computer outputs a power control instruction according toload demands; the multi-output power management circuit comprises a power input interface for inputting a power signal, a plurality of voltage conversion circuits, a controller and a power module; the plurality of voltage conversion circuits are connected with the power input interface separately and are arranged to carry out current and/or voltage conversion; the controller is connected with theupper computer, is provided with a plurality of enable pins connected with the plurality of voltage conversion circuits separately and is arranged to output corresponding enable signals to enable thecorresponding voltage conversion circuits to work to output required electric signals according to the power control instruction; and the power module is connected between the power input interface and a power pin of the controller and provides the controller with electricity. The problems that a traditional power management circuit is complicated in system, high in cost and large in occupied space are solved.

The invention provides a heat transfer type resistance box and relates to electric heating equipment. The heat transfer type resistance box is composed of an upper box body, an air pipe array, a lower box body and a resistance wire. The upper box body is communicated with the lower box body, a heat exchange area is constituted by the inner space of the upper box body, the air pipe array is arranged in the heat exchange area, a front air chamber is arranged on the left side of the upper box body, a rear air chamber is arranged on the right side of the upper box body, and the front air chamber is communicated with the rear air chamber through intra-pipe spaces of the air pipe array. A heat transfer area is constituted by the inner space of the lower box body, the resistance wire is arranged in the heat transfer area, a front conductive support is arranged at the front end of the inner space of the lower box body and mounted at the inner end of a wire inlet assembly, a rear conductive support is arranged at the rear end of the inner space of the lower box body and mounted at the inner end of a wire outlet assembly, and the two ends of the resistance wire are connected to the front conductive support and the rear conductive support through mounting parts. The heat transfer type resistance box is used for high-power plasma equipment treating household garbage and enables network voltage to be stable and a plasma torch to work stably; heat of the resistance wire is transferred through heat conduction oil, and heat energy is recovered for drying garbage.

The invention relates to a bidirectional charging/discharging device and a bidirectional charging/discharging method for an accumulator. The device comprises a controller, a change-over switch, a charging/discharging switch tube, a discharging switch tube, a first freewheel diode, a second freewheel diode, a normally-closed contactor, a third freewheel diode, the accumulator, an actual load, a charger and a battery current sensor. According to the device and the method provided by the invention, bidirectional DC/DC can be achieved under the premise of only using a set of circuits.

The invention relates to the technical field of rail locomotives. The invention discloses a pure electric rail locomotive power battery safety guarantee method. The guarantee method comprises the following steps: setting good physical insulation isolation and double-branch physical isolation between battery modules, reasonably setting fuses, carrying out total positive and total negative physicalisolation, and adopting safe system power-on and power-off strategies. According to the method, through the measures, the power batteries are protected, faults such as short circuit, grounding and local out-of-control expansion of the power batteries are prevented, and the safe application of the power batteries is ensured.

The invention relates to a charging circuit for the storage battery of a solar energy illumination system, comprising: a pulse width modulating control chip, a first main power transformer, also comprising: one end of a sampling resistance for charging current is connected with the grounded winding of the main power transformer, the other end of the sample resistance is connected with the negative pole of the storage battery and the same phase end sixteenth pin of the pulse width modulating control chip respectively; one end of the twenty third resistance network is connected with the fifteenth pin of the pulse width modulating control chip, the other end of the twenty third resistance network is connected with the third pin of the pulse width modulating control chip; one end of the thirty third resistance network is connected with the grounded end of the first main power transformer, the other end of the thirty third resistance network is connected with the fifteenth pin of the pulse width modulating control chip; the two ends of the thirty forth resistance network are connected with the fifteenth pin and the fourteenth pin of the pulse width modulating control chip respectively; because a constant current/constant voltage charging mode autochangeover is adopted, so that high current surge is prevented, the lifetime of the storage battery is prolonged.

The invention discloses an LED driving system which comprises a power supply module, an LED driving adjustment module, an LED control switch, a soft start module and an LED module. The power supply module, the LED module and the LED control switch are sequentially connected. The input end of the LED module is connected with the voltage sampling input end of the LED driving adjustment module. The output end of the LED control switch is connected with the current sampling input end of the LED driving adjustment module. The output end of the LED driving adjustment module is connected with the control input end of the LED control switch. The output end of the power supply module is connected with the input end of the soft start module. The output end of the soft start module is connected withthe control input end of the LED control switch. The soft start module is used to soft start the LED module. The soft start module enables the LED module to be turned on at the zero crossing point ofalternating current to prevent the LED module from large current shock.