31results about How to "Control output current" patented technology

The invention discloses an excitation state analysis-based low-voltage ride-through control method of a virtual synchronous power generator. The method comprises the steps of improving designs of droop characteristic, a reactive power ring and an active power ring by means of a reactive power adjustment principle of the synchronous power generator and a power grid which are connected in parallel,and the problems of excessive large reactive power increment, difficulty in preventing impact current and loop coupling reinforcement are effectively dealt with; and on the basis of no change on characteristic of the state analysis-based low-voltage ride-through control method of virtual synchronous power generator (VSG) system, an additional current ring is designed again, the under-excitation state running of an auxiliary system can be assisted during power grid fault period, an output current is adjusted, and a reactive power support is given out. A new directional method is employed, the transient process is accelerated, a control algorithm is not needed to be switched during the power grid fault period, a smooth switching strategy among states is also not needed to be added, and the low-voltage ride-through problem and the asymmetric drop of the power grid can be simultaneously dealt with.

Disclosed are an inverter control device and an inverter control method, wherein a switching circuit on one side is driven with a fixed conduction width and a switching circuit on the other side is switched to a pulse width modulation system, a phase control system, or a drive signal width control system using the phase control system according to the output state, thereby implementing high accurate control at the time of small output while suppressing the heat generation of switching elements.

The present invention provides switching type controller, used in power supply delivery unit primary side for controlling current output. It includes waveform detector, discharge time detector, oscillator, integrator, error amplifier pulsewidth comparer. The current output of power supply delivery unit can be stable adjusted on primary side.

It is possible to provide a fuel cell system which can control an output current of a fuel cell even if an error occurs in control of splitting a flow of an oxidizing gas. The fuel cell system includes a fuel cell and a feed device for transmitting the oxidizing gas under a pressure to the fuel cell. A feed channel is connected to a discharge channel by a bypass channel so that the oxidizing gas flows while bypassing the fuel cell. The system includes: a pressure adjusting valve which adjusts the split flow of the oxidizing gas to the bypass channel and the fuel cell; and a bypass valve. Whenthe pressure adjusting valve or the bypass valve has failed, a control unit stops the control of the output current of the fuel cell by control of the pressure adjusting valve and switches the controlto a control of the output current of the fuel cell by control of the feed device.

The invention concerns a load pump device able to provide a constant current, respectively positive or negative, over an extremely wide output voltage range. A symmetrical switching system activates a first operational amplifier (AOP1) associated with the positive current source or a second amplifier (AOP2) associated with the negative current source according to predetermined threshold values (Vref), the first amplifier being provided so as to restore the behavior of the current mirror (M2, M1) generating a positive current when the output voltage of the device approaches the feed voltage (VDD) and the second amplifier being provided so as to restore the behavior of the current mirror (M4, M3) generating a negative current when the output voltage of the device approaches the earth (GND), thus allowing the output current of the device to be always constant and equal to a reference value (Iref).

The invention discloses a power supply system and a current control method of the power supply system. The method comprises the following steps: when a power supply device is started, an output current generated by the power supply device is increased; then, when the output current is increased to reach a rated output current value, the output current begins to be decreased; finally, when the output current is decreased to reach a normal-state output current value, the output current is maintained to be the normal-state output current value.

The invention provides a vehicle-mounted fuel cell system and a start operation control method thereof, belongs to the technical field of fuel cells, and solves the problem that a coordination control method for a fuel cell and a DC-DC converter within a wide step-up ratio range in the process of switching from cold start to normal operation does not exist in the prior art. The system comprises a galvanic pile, a DC-DC converter, hydrogen equipment, air equipment and a controller. The hydrogen inlet of the electric pile is connected with the output end of the hydrogen equipment, the air inlet is connected with the output end of the air equipment, and the power supply end is connected with the DC-DC converter. And during low-temperature starting, the controller controls the DC-DC converter to be in a low switching frequency, the air equipment and the hydrogen equipment are started, and the stoichiometric ratio and the current of air entering the pile are adjusted, so that the pile outputs target voltage. And in the switching process, after the controller controls the output current of the electric pile to be reduced to a calibration value, the in-pile air stoichiometric ratio is adjusted to a target stoichiometric ratio. And during high-temperature operation, the controller controls the DC-DC converter to convert high switching frequency, and then the parameters of the fuel cell are adjusted in real time.

The invention discloses a control gain adjustment method and device of a reactive power compensation device and a system. The method comprises a step of calculating a deviation value of control pointbus voltage according to a sampling value of the control point bus voltage and a target value of the control point bus voltage, a step of obtaining a control point operation short-circuit capacity ofan SVC, and a step of calculating an adjustment step number of the control gain of the SVC based on the deviation value of control point bus voltage and the control point operation short-circuit capacity. According to the method provided in the embodiment of the present invention, the adjustment step number of the control gain can be adjusted according to an actual value of the control point operation short-circuit capacity such that SVC controller gain parameters are matched with a short-circuit capacity of a power grid.

Disclosed herein is a resonant converter, including: a power conversion circuit alternately switching applied DC power to output a predetermined level of output power; and a control circuit fixing an operating frequency and controlling the level of the output power by varying the comparison voltage level that is a comparison target of the operating frequency, by determining that a short circuit occurs when the output current of the power conversion circuit is a reference current or more by comparing the output current of the power conversion circuit with the reference current. By this configuration, the output current can be constantly controlled even when the short circuit occurs in the output end of the resonant converter.

The invention discloses a mainboard cold standby power supply circuit which comprises a PSU and a BBU used for supplying power to a mainboard, a first switching circuit arranged on a power supply lineof the PSU, a second switching circuit arranged on a power supply line of the BBU, a current limiting switching circuit connected with the first switching circuit in parallel, and a control circuit.When the mains supply is just powered on or the PSU is just inserted into the circuit board, output is not stable, the PSU supplies power to the rear-end circuit through the current-limiting switch circuit. According to the mainboard cold standby power supply circuit, the output current of the PSU is limited, so that the situations of arc and the like caused by impact of large current generated when the output of the PSU is not stable on a rear-end circuit are avoided, namely, PSU hot plugging can be reliably realized without depending on a switching circuit working in an amplification region,and the safety and reliability of the mainboard cold standby power supply circuit are improved. The invention further discloses a storage server which has the same beneficial effects as the mainboardcold standby power supply circuit.

The invention discloses an integrated control circuit of an LED (light-emitting diode), comprising a central controller and multiple paths of LED driver circuits, wherein the central controller comprises a silicon controlled rectifier (SCR) and a dimming control trigger circuit; the dimming control trigger circuit comprises a manual luminance regulation trigger circuit and / or an environmental luminance detection and luminance regulation trigger circuit and / or a timing control and regulation trigger circuit and is used for outputting manual, light-operated and / or time-control dimming signals; and each LED driver circuit comprises a main circuit, a signal detection, reshaping and conversion circuit and a current regulation and constant-control circuit. The dimming effect within a wider range can be obtained when the conduction angle of the SCR in a central controller changes within a small range; and in addition, the invention has simple circuit and low cost, does not generate large harmonic wave and can lower the possibility of harmonic wave pollution.

The invention discloses a high-reliability electronic meridian treatment instrument. The high-reliability electronic meridian treatment instrument comprises an operational amplifier power supply unit, a single chip microcomputer power supply unit, and a three-way treatment intensity adjustment output unit, wherein the three-way treatment intensity adjustment output unit comprises an A-way treatment intensity adjustment output unit, a B-way treatment intensity adjustment output unit and a C-way treatment intensity adjustment output unit; the operational amplifier power supply unit comprises a diode D1 and a diode D2; the single chip microcomputer power supply unit comprises a power supply voltage-stabilizing chip U5; the A-way treatment intensity adjustment output unit comprises an integrated circuit U7; the B-way treatment intensity adjustment output unit comprises an integrated circuit U8; and the C-way treatment intensity adjustment output unit comprises an integrated circuit U9. The high-reliability electronic meridian treatment instrument has the following advantages of high reliability, high anti-interference performance, capability of effectively controlling output current, stable voltage output, high signal output stability, low error, good curative effect and low manufacturing cost.

The invention concerns a load pump device able to provide a constant current, respectively positive or negative, over an extremely wide output voltage range. A symmetrical switching system activates a first operational amplifier (AOP1) associated with the positive current source or a second amplifier (AOP2) associated with the negative current source according to predetermined threshold values (Vref), the first amplifier being provided so as to restore the behavior of the current mirror (M2, M1) generating a positive current when the output voltage of the device approaches the feed voltage (VDD) and the second amplifier being provided so as to restore the behavior of the current mirror (M4, M3) generating a negative current when the output voltage of the device approaches the earth (GND), thus allowing the output current of the device to be always constant and equal to a reference value (Iref).

The invention relates to an electronic meridian treatment device with a small waveform distortion factor, comprising a total waveform generator U16, an integrated circuit U7, an integrated circuit U8 and an integrated circuit U9; a second pin of the total waveform generator U16 is connected with a third pin of a gliding resistor R22; a first pin of the integrated circuit U7 is connected with a fifth pin of a single chip U6; a first pin of the integrated circuit U8 is connected with an eighth pin of the single chip U6, a first pin of the integrated circuit U9 is connected with an eleventh pin of the single chip U6. The electronic meridian treatment device is good in anti-disturbance performance, stable in intensity output, high in reliability and low in fault rate; the waveform generating unit is stable in performance and low in cost, and featured by universality, usability, expansibility, and stability; the electronic meridian treatment device is strong in flexibility, powerful in function, small in output signal frequency bias, high in resolution rate and has full digital; the device is convenient to integrate and use; the work is stable; besides, the device is low in manufacturing cost, good in treatment effect, safe and reliable, and has good treatment effect.

An embodiment of the present invention provides a current inverter, including a current controller of the inverter; it is characterized in that the current controller includes a simple proportional-integral control part and a proportional resonance control part. The simple proportional-integral control part and proportional resonance control part designed according to the method of the embodiment of the present invention can well control the output current of the inverter.

The embodiment of the invention provides a current inverter. The current inverter comprises a current controller of the inverter. The current inverter is characterized in that the current controller comprises a simple proportional integral control part and a proportional harmonic control part. According to the simple proportional integral control part and the proportional harmonic control part designed by the method in the embodiment of the invention, the output current of the inverter can be well controlled.

The invention relates to a low-loss electronic meridian therapeutic instrument, which comprises a photoelectric coupler U13, a photoelectric coupler U14, a photoelectric coupler U15, an integrated circuit U7, an integrated circuit U8 and an integrated circuit U9. The pin 1 of the photoelectric coupler U13 is connected with the pin 2 of the photoelectric coupler U13 through a diode D22; the pin 1 of the photoelectric coupler U14 is connected with the pin 2 of the photoelectric coupler U14 through a diode D23; the pin 1 of the photoelectric coupler U15 is connected with the pin 2 of the photoelectric coupler U15 through a diode D24; the pin 1 of the integrated circuit U7 is connected with the pin 5 of a single-chip microcomputer U6; the pin 1 of the integrated circuit U8 is connected with the pin 8 of the single-chip microcomputer U6; and the pin 1 of the integrated circuit U9 is connected with the pin 11 of the single-chip microcomputer U6. The electronic meridian therapeutic instrument is good in anti-interference performance, is stable in intensity output, is high in reliability, is low in failure rate, is fast in reaction speed, is timely in feedback to a relay, can keep detecting cup drop in the whole therapeutic process, is low in manufacturing cost, is safe and reliable and has a good curative effect.

The invention relates an electronic main-and-collateral-channel therapeutic apparatus in good power supply persistence, comprising a power supply voltage stabilizing chip U5, an integrated circuit U7, an integrated circuit U8, and an integrated circuit U9. The first pin of the power supply voltage stabilizing chip U5 is connected with ground through a transient suppression diode D20. The first pin of the integrated circuit U7 is connected with the fifth pin of a single chip microcomputer U6. The first pin of the integrated circuit U8 is connected with the eighth pin of the single chip microcomputer U6. The first pin of the integrated circuit U9 is connected with the eleventh pin of the single chip microcomputer U6. The electronic main-and-collateral-channel therapeutic apparatus is good in anti-interference ability and stable in intensity output. The electronic main-and-collateral-channel therapeutic apparatus is high in reliability, low in failure rate, stable in voltage output, high in long-term working stability, simple in structure, low in cost, low in manufacturing cost, and good in treatment effect. The electronic main-and-collateral-channel therapeutic apparatus is safe and reliable, and has good curative effect.

The invention discloses a primary side feedback flyback LED constant current driver based on power tube drain detection technology, which consists of an EMI filter, a rectifier, a large capacitor Cin, an RCD absorption circuit, a flyback transformer, a power MOS tube, a primary side It consists of sampling resistor Rcs, secondary diode D0, output capacitor Co, LED, secondary on-time acquisition module, LED output current estimation module and PWM controller. Compared with the prior art, the present invention does not need an optocoupler device and an auxiliary winding, and obtains the conduction time information of the secondary diode by detecting the drain of the power switch tube, and the peak current information of the primary side obtained by sampling the source of the power MOSFET, and inputs them together To the PWM controller, the PWM controller obtains the output current information through calculation, so as to control the LED output current to be constant.

The invention provides a power tube test circuit, the circuit which comprises a power tube, a control circuit and a sampling tube, the power tube comprises N + 1 unit tubes, the N + 1 unit tubes comprise a first unit tube and N unit tubes, in a test mode, the control circuit closes the N unit tubes and only opens the first unit tube, so that the output current of the power tube is reduced, therefore, the large current is converted into the small current which can be tested through the probe, and the stability of the test is improved.

The invention relates to an anti-interference electronic meridian therapeutic instrument, which comprises an integrated circuit U7, an integrated circuit U8, an integrated circuit U9, a transformer U10, a transformer U11, a transformer U12, a triode Q2, a triode Q3 and a triode Q4. The pin 1 of the integrated circuit U7 is connected with the pin 5 of the integrated circuit U6; the pin 1 of the integrated circuit U8 is connected with the pin 8 of the integrated circuit U6; the pin 1 of the integrated circuit U9 is connected with the pin 11 of a single-chip microcomputer U6; the pin 1 of the transformer U10 is connected with the pin 4 of a power amplifier circuit U3; the pin 1 of the transformer U11 is connected with the pin 4 of a power amplifier circuit U2; the pin 1 of the transformer U12 is connected with the pin 4 of a power amplifier circuit U1; the emitting electrode of the triode Q2 is grounded; the emitting electrode of the triode Q3 is grounded; and the emitting electrode of the triode Q4 is grounded. The anti-interference electronic meridian therapeutic instrument is high in reliability, low in failure rate, fast in boosting speed and high in voltage stability; a set voltage can be reached in a short time, thereby improving precision of the electronic meridian therapeutic instrument; and the electronic meridian therapeutic instrument is not prone to damage and low in failure rate, being low in production cost and good in treatment effect, being safe and reliable, and has a better therapeutic effect.

The invention discloses a centrifugal fan intelligent cooling protection self-starting control system. The system comprises a centrifugal fan, a cooling structure, a temperature sensor, a controller, a display control panel, an alarm unit, a power supply and a cooling water tank, wherein the cooling structure and the temperature sensor are arranged on the centrifugal fan; the controller is connected with the centrifugal fan; the display control panel and the alarm unit are arranged on the controller; the power supply is connected with the controller; the cooling water tank is connected with the cooling structure through a cooling driving device; the temperature sensor is further connected with the controller; the cooling driving device is also connected with the power supply and the controller; the cooling driving device is a temperature control starting circuit provided with a cooling water pump; and the power input end of the temperature control starting circuit is connected with the power supply. The centrifugal fan intelligent cooling protection self-starting control system provided by the invention can automatically cool equipment at a high temperature during equipment operation and can give an alarm in time when the temperature exceeds a set value to remind related staff to maintain the equipment.

The invention discloses an excitation state analysis-based low-voltage ride-through control method of a virtual synchronous power generator. The method comprises the steps of improving designs of droop characteristic, a reactive power ring and an active power ring by means of a reactive power adjustment principle of the synchronous power generator and a power grid which are connected in parallel,and the problems of excessive large reactive power increment, difficulty in preventing impact current and loop coupling reinforcement are effectively dealt with; and on the basis of no change on characteristic of the state analysis-based low-voltage ride-through control method of virtual synchronous power generator (VSG) system, an additional current ring is designed again, the under-excitation state running of an auxiliary system can be assisted during power grid fault period, an output current is adjusted, and a reactive power support is given out. A new directional method is employed, the transient process is accelerated, a control algorithm is not needed to be switched during the power grid fault period, a smooth switching strategy among states is also not needed to be added, and the low-voltage ride-through problem and the asymmetric drop of the power grid can be simultaneously dealt with.

The invention discloses a device for controlling a plurality of LED power supplies in parallel connection with light-operated and dimming functions. The device comprises a master-slave power supply determination module, a master power supply module and a slave power supply module. The master-slave power supply determination module is used for setting the master power supply module and the slave power supply module according to a detection result of an environment state; and the master power supply module converts collected environment state detection information into a synchronizing signal, sends the synchronizing signal to a synchronizing signal receiving circuit through a synchronizing signal sending circuit, reads the synchronizing signal from the power supply module, and decides whether to turn on output and enable dimming or turn off the output and turn off a dimming function according to a reading result of the synchronizing signal. The invention further discloses a control method corresponding to the device. According to the device and the method, control precision is enhanced, overall control performance is improved, and cost is reduced.

The invention discloses a control device for parallel connection of multiple LED power supplies for light control and dimming, including: a master-slave power supply determination module, a master power supply module and a slave power supply module; the master-slave power supply determination module is used for detecting results according to environmental conditions Set the main power module and the slave power module; the main power module converts the collected environmental state detection information into a synchronous signal, sends it to the synchronous signal receiving circuit through the synchronous signal sending circuit, reads the synchronous signal from the power module, and according to the synchronous The signal reading result determines whether the output is turned on and the dimming is enabled or the output is turned off and the dimming function is turned off. The invention also discloses a control method corresponding to the device. The device and method enhance the control precision, improve the overall control performance and reduce the cost.

The invention discloses an electronic meridian treatment instrument with a long communication distance. The electronic meridian treatment instrument comprises a communication unit and a three-way treatment intensity adjustment output unit, wherein the three-way treatment intensity adjustment output unit comprises an A-way treatment intensity adjustment output unit, a B-way treatment intensity adjustment output unit and a C-way treatment intensity adjustment output unit; and the communication unit comprises a connector J13. The treatment instrument has the following advantages: the communication distance is long, the fault rate is low, the anti-interference performance is good, the reliability is high, the treatment effect of the meridian treatment instrument is good, the purpose of dredging meridians can be achieved, the disease healing rate is high, and the manufacturing cost is low.