332 results about "Current regulation" patented technology

The invention discloses a new energy commercial vehicle fast charging working condition thermal management control method and system, and relates to the technical field of new energy vehicle thermal management and fast charging control, and the method comprises the following steps: collecting the temperature, voltage and current data of each subarea of a battery in a fast charging process, forming a time synchronization sequence, and based on the sequence, obtaining a new energy commercial vehicle fast charging condition; calculating internal thermal resistance and thermal capacity parameters of the battery in real time by using an online identification algorithm, updating a basic thermal model to obtain a corrected thermal dynamic model reflecting actual thermal characteristics of the current battery, importing the corrected model into a model prediction controller, constructing a multi-objective optimization function, and performing rolling solution in a prediction time domain to obtain a prediction model; and outputting an optimal target charging current instruction and a cooling total demand, adjusting the charging power according to the target current, and combining the temperature difference distribution of each partition. Accurate prediction and partition cooperative control of the thermal state of the battery in the fast charging process are achieved, the temperature rise and the temperature difference are effectively restrained while the charging efficiency is guaranteed, the service life of the battery is prolonged, and the system safety is improved.

The invention belongs to the technical field of electronic information, and provides a method for optimizing the stability of a photoelectric information conversion assembly in a severe environment, which comprises the step of optimizing the stability of the photoelectric information conversion assembly in the severe environment. The method comprises the following steps of: synchronously acquiring environment parameters such as temperature, humidity and illumination and equipment current data in a high-temperature and high-humidity environment to construct a multi-dimensional time sequence group; analyzing the coupling degree of each environment parameter and the current sequence, and after locking the high coupling relationship between illumination and current, judging whether the current response has delay or not when the illumination suddenly changes; if the delay exists, further analyzing the current response sensitivity, if the sensitivity deviates from expectation, constructing an illumination-current prediction model, and calculating the current regulation quantity in advance by predicting the illumination abrupt change amplitude to realize pre-regulation; and finally, collecting the adjusted data iteration optimization model, and improving the dynamic response performance and stability of the assembly in a complex environment.

The invention discloses a driving control method, a driving control circuit and electronic equipment. The driving control method comprises the following steps: acquiring a power supply output voltage, an energy storage characteristic voltage and an energy storage characteristic current in an energy storage compensation circuit; performing first filtering processing on the power supply output voltage to obtain a target output voltage; obtaining a feedback regulation output value by using the target output voltage and the power supply output voltage; obtaining an energy storage adjustment output value by using the target energy storage voltage and the energy storage characteristic voltage; obtaining a voltage regulation output value by using the feedback regulation output value and the energy storage regulation output value; obtaining a current regulation output value by using the energy storage characteristic current and the voltage regulation output value; generating a driving control signal by using the current regulation output value; and the driving control signal is sent to the energy storage compensation circuit so as to adjust the power supply output voltage. According to the driving control method, the time delay of dynamic compensation of the power supply output of the energy storage compensation circuit is short, the response is quicker, and the structure is simpler.

The invention provides an anti-over-temperature protection method and system for a battery of a two-wheeled vehicle of a battery changing cabinet in the technical field of battery safety management of the battery changing cabinet. The method comprises the following steps: S1, setting a threshold parameter; s2, collecting the temperature value and the real-time SOC of each battery in the charging process, and calculating the temperature rise rate; s3, when the temperature value is smaller than the temperature early warning value and the temperature rise rate is smaller than or equal to a first temperature rise rate threshold value, a minute-level monitoring mode is triggered; s4, when the temperature value is larger than or equal to the temperature early warning value or the temperature rise rate is larger than a second temperature rise rate threshold value, a second-level monitoring mode is triggered, and the initial charging current is adjusted based on a three-level current regulation and control strategy; s5, performing current recovery operation on the reduced charging current; s6, executing fusing protection based on the triggering times of the three-level current regulation and control strategy; and S7, when the real-time SOC reaches the SOC upper limit, stopping charging of the battery. The power conversion cabinet has the advantage that the charging safety of the power conversion cabinet is greatly improved.

The invention belongs to the technical field of off-grid inverter and battery management, and particularly relates to an off-grid inverter battery protection and charging control method and system based on impedance detection, and the method comprises the steps: collecting battery input parameters under two different load working conditions: no-load or light-load and on-load conditions; an Ohm law analytical algorithm is adopted, a corresponding relation model of the lithium battery remaining capacity SOC and the battery internal resistance is preset, the current actual internal resistance of the battery is obtained, the preset SOC-internal resistance corresponding relation model is input, and the current SOC value of the battery is obtained through reverse deduction; an inverter charging current adjusting threshold value is set in a grading mode, and a multi-dimensional risk early warning threshold value is set in a grading mode; and when the monitored numerical value exceeds a correspondingly set risk early warning threshold value, triggering a risk early warning signal of a corresponding grade and a matched disposal action, and carrying out full-process management and control of battery state real-time monitoring, charging current self-adaptive adjustment and risk early warning. Therefore, the problems of short service life, poor charging safety and the like of the battery in the prior art are solved.

The invention relates to a thermodynamic design method for distributed overhead ground wire alternating current ice melting, and belongs to the technical field of power transmission line ice melting. The method aims at solving the problems that an existing ice melting technology is high in power consumption, low in efficiency, difficult in equipment movement and lack of fine design of a current regulation and control strategy. The core of the technical scheme is that a thermal equivalent theoretical model and an electric heat flow coupling simulation model of the overhead ground wire are established, key thresholds such as wire protection current, critical ice melting current and maximum allowable current are determined through calculation, and an effective value of alternating current injected into the ground wire is flexibly adjusted by using a reactive power compensation device. According to the method, segmented ice melting according to needs can be achieved, energy consumption is remarkably reduced, the ice melting efficiency and safety are improved, and the needed device is small in size, convenient to move and deploy and suitable for various complex icing working conditions.

The invention discloses a material flow collaborative distribution system for a double-color injection mold of an automobile connector, relates to the technical field of intelligent manufacturing equipment, and can solve the technical problems of inaccurate regulation and control in the injection molding process and easy generation of a bonding line defect, and the material flow collaborative distribution system comprises the following steps: obtaining production monitoring data in the production process of the double-color injection mold; according to time sequence monitoring parameters in the production monitoring data, abnormal data generated by temporary interference are identified and eliminated, and abnormal state parameters are obtained; wherein the abnormal state parameter is used for representing a real process abnormal state after the temporary interference is eliminated; according to the abnormal state parameter, screening out a historical similar state similar to the current production process from the historical production monitoring data, and determining the interference degree on the defect of the bonding line in the current production process according to the historical similar state; determining a current regulation and control demand according to the interference degree; and a regulation and control instruction is generated according to the current regulation and control requirement, and an execution mechanism is driven according to the regulation and control instruction to adjust the melt propelling speed.

The utility model discloses a leakage current detection type PCBA test circuit and equipment. The leakage current detection type PCBA test circuit comprises a test current signal output unit, a test voltage signal output unit and a test result signal output unit, the test current signal output unit is used for outputting a leakage current detection current signal; the test current signal output unit is provided with a current adjusting circuit, and the current adjusting circuit is used for adjusting the value of the leakage current detection current signal. The test voltage signal output unit is used for outputting a leakage current detection voltage signal; the test voltage signal output unit is provided with a voltage adjusting circuit, and the voltage adjusting circuit is used for adjusting the value of the leakage current detection voltage signal. The leakage current detection current signal and the leakage current detection voltage signal are used for being loaded to a PCBA to be detected; when the PCBA receives the leakage current detection current signal and the leakage current detection voltage signal, a leakage current protection signal is output; the test result output unit is configured to output a test result signal when the leakage current protection signal is received.

The invention relates to a multi-split air conditioner regulation and control method, device and equipment, a storage medium and a product. The method comprises the steps that reference temperature data of a target building where the multi-split air conditioner is located and reference power data of the multi-split air conditioner within a preset reference time period are obtained, and a target thermal parameter value of the target building is obtained through a preset building thermal model, the reference temperature data and the reference power data, the building thermal model is used for calculating heat change data and heat exchange data of the target building, and the target thermal parameter value is a value of a thermodynamic parameter of the target building under the condition that the heat change data and the heat exchange data meet a preset heat balance relationship; and the actual load-shedding power amount of the multi-split air conditioner in the current regulation and control time period is determined, so that the multi-split air conditioner is regulated and controlled according to the load-shedding power amount. By adopting the method, the dynamic thermodynamic characteristics of the building under the actual operation working condition can be determined, the adjustable potential of the air conditioning system can be accurately quantified, and the regulation and control accuracy can be improved.

The invention discloses a power supply control method and system based on a real-time slope adjustment algorithm, and the method comprises the steps: monitoring the load impedance characteristics of a power supply and environment noise data in real time, and obtaining an independent control time slice set; obtaining a time sequence identifier of the control time slice set, and obtaining a dynamic mode parameter packet bound with the current load characteristic; obtaining a real-time voltage / current regulation instruction set with a feed-forward compensation coefficient according to the dynamic mode parameter packet and the error tolerance data; analyzing the real-time voltage / current regulation instruction set, and combining the historical working condition similarity data to obtain an optimized PID coefficient matrix and a feed-forward gain vector; and executing the optimized PID coefficient matrix and the feed-forward gain vector, and generating and outputting a four-dimensional space trajectory signal which is completely matched with the target slope trajectory as a direct driving reference of a power supply power device. According to the embodiment of the invention, high-precision and low-jitter real-time slope tracking control can be realized, and the dynamic response speed and anti-interference robustness of a power supply system are improved.

The invention discloses a power supply control method of a hard disk array and electronic equipment, and relates to the technical field of server storage. The method comprises the following steps: acquiring hard disk starting power consumption in a server power-on stage; according to the hard disk starting power consumption, determining an initial starting number, simultaneously electrifying a plurality of hard disk groups which are initially started in the hard disk array, and obtaining first power consumption of the hard disk array; according to the first power consumption, the remaining hard disk groups in the hard disk array are powered on in batches, so that all the hard disk groups in the hard disk array are powered on; in a server operation stage, obtaining second power consumption of the hard disk array to construct a power consumption regulation and control model; and based on the power consumption regulation and control model and the power consumption tracking sequence, determining a target power supply current adjustment signal, so that the first logic device adjusts the power supply current of the hard disk array according to the target power supply current adjustment signal. Therefore, tracking and stable control of the power consumption of the hard disk array are realized.

The invention discloses a voltage compensation method, a voltage compensation circuit and electronic equipment. The voltage compensation method comprises the following steps: acquiring bus voltage in a power switch circuit and energy storage current in an energy storage compensation circuit; obtaining a bus amplitude limiting voltage target value by using the bus voltage target value and the bias adjustment value, and subtracting the bus voltage from the bus amplitude limiting voltage target value to obtain a bus amplitude limiting voltage error value; performing proportional integral operation and amplitude limiting processing on the bus amplitude limiting voltage error value to obtain an energy storage current target value, and subtracting the energy storage current from the energy storage current target value to obtain an energy storage current error value; performing proportional integral operation on the energy storage current error value to obtain a current regulation output value; and a compensation control signal is obtained by using the current regulation output value and is used for triggering the energy storage compensation circuit to change the charging and discharging states, so that the bus voltage is compensated and regulated to a set threshold range. Through the above mode, the voltage compensation method can effectively stabilize the bus voltage within the set threshold range, and the control logic is simple.

The invention discloses a temperature compensation circuit, a power amplifier and a radio frequency front-end module. The temperature compensation circuit comprises a temperature compensation module, a current source module and a control module. The temperature compensation module is used for outputting a first temperature compensation voltage under the condition that the environment temperature is smaller than or equal to a first temperature threshold value; the current source module is connected between the temperature compensation module and the output port and is used for converting the temperature compensation voltage output by the temperature compensation module into control current; the current source module is provided with at least two current adjusting gears, and the control module is connected with the current source module. When the first temperature compensation voltage output by the temperature compensation module is in positive correlation with the environment temperature, and the environment temperature is smaller than or equal to a first temperature threshold value (namely, the low-temperature environment), the control current is reduced accordingly, so that the offset signal of the compensated power amplifier is synchronously reduced, and the offset signal of the power amplifier is synchronously reduced. The working gain of the power amplifier in a low-temperature environment can be reduced, so that the durability of the power amplifier is improved.

A differential pulse conveyor system includes detectable markers arranged in series on moving parts of the conveyor system. A stationary sensor positioned near the marker generates a signal to place the marker near the sensor when the moving part is within a first range of motion, and the sensor does not generate a signal when the moving part is outside the first range of motion. The sensor signal causes a current regulating device to adjust the current from a current source to operate a motor to power a conveyor tray to move at a first acceleration rate in a first mode, and the signal activation causes the current regulating device to operate the motor to power the conveyor tray to move at a second acceleration rate in a second mode. The markers can be positioned to optimize the timing of the current mode.

The invention provides a control method of an oxygen adjusting module and a refrigerator with the oxygen adjusting module. The control method of the oxygen adjusting module comprises the following steps that the oxygen adjusting module is started; the real-time current of the oxygen adjusting module is collected; and based on the real-time current, adjusting the voltage of the oxygen adjusting module so that the real-time current is not greater than a preset range. The real-time current is collected and transmitted to the control device, and the control device adjusts the voltage of the oxygen adjusting module based on the real-time current, so that it is ensured that the oxygen adjusting module operates at the proper current, and the current of the oxygen adjusting module is prevented from being too high.

This invention provides a method and system for handling redundant communication faults in a steer-by-wire system, relating to the field of steer-by-wire technology. The method includes: acquiring the original communication status parameters of independently configured first and second communication channels; the first and second communication channels are two independent communication channels between the main control unit and the redundant control unit in the steer-by-wire system; verifying the original communication status parameters based on a preset multi-dimensional verification strategy, and determining the current fault level of the system by combining preset fault level judgment rules and a dynamically adjustable fault judgment cycle, wherein the fault level is based on the communication channel status combination and fault severity; and executing matching fault handling, signal switching, and current regulation strategies based on the fault level, combining hierarchical signal control logic and a motor current gradient limiting mechanism to achieve precise switching between system signals and motor current.

This invention proposes a multi-channel DC adjustable intelligent electronic circuit breaker, specifically relating to the field of circuit protection technology. It includes an MCU module; a power supply connected to the MCU module; a current adjustment knob (KNOB) connected to the MCU module; at least one intelligent fuse connected to both the power supply and the MCU module, with each intelligent fuse corresponding to a load connected to its respective channel; one-time fuses corresponding to the intelligent fuses; and a Bluetooth unit built into the MCU module. By configuring the MCU module, designing the current adjustment knob (KNOB) on the MCU module, and designing intelligent fuses on each load-connected path, the short-circuit protection response time of the multi-channel DC adjustable intelligent electronic circuit breaker proposed in this invention is improved by one level, from the microsecond (µs) level to the nanosecond (ns) level.

The application discloses a current regulating circuit, a first control module is arranged between the gate of a first PMOS and the gate of a second PMOS, when receiving a first closing instruction, the first control module controls the gate of the second PMOS to be connected with the gate of the first PMOS, the second PMOS is turned on, the first PMOS and the second PMOS are connected in common-gate to form a current mirror and output current; when receiving a first opening instruction, the first control module controls the second PMOS to be turned off, and the second PMOS cannot output current. When the second PMOS is turned on, the current output by the drain of the second PMOS directly flows into the output end of the current regulating circuit, the second PMOS is prevented from being affected by the on-voltage drop, so that the second PMOS stably works in a saturation region, the working condition of the second PMOS as the current mirror is met, and the stability of the current regulating circuit is ensured.

The invention relates to the technical field of semiconductors, and provides an MOS (Metal Oxide Semiconductor) device and a preparation method thereof. The epitaxial layer is arranged on the substrate and has a first doping type; the current adjusting layer is arranged in the epitaxial layer and has a first doping type, the doping concentration of the current adjusting layer is larger than that of the epitaxial layer, and the current adjusting layer comprises a plurality of first current adjusting parts which are arranged at intervals in the direction parallel to the substrate; the base regions are of a second doping type, the second doping type is opposite to the first doping type, and the multiple base regions are arranged in the epitaxial layer at intervals and located on the side, away from the substrate, of the current adjusting layer; the well region with the second doping type and the source region with the first doping type are arranged in the base region; and the trench gate structure is at least partially arranged in the interval between the adjacent base regions, and the trench gate structure extends into the current adjusting layer and is in contact with the first current adjusting part.

The invention relates to the technical field of power electronics, and discloses an output commercial power impact resistance control and protection method for a sine wave inverter, and the method comprises the steps: S1, carrying out the normal output control, sampling the output current of the inverter, generating an alternating current instruction according to an output target, and carrying out the normal output control; according to the error between the current instruction and the sampling current, digital adjustment operation is executed, and a pulse width modulation signal for driving an inverter full bridge is generated; s2, key electrical quantity monitoring is carried out in the operation process of the inverter; s3, judging a commercial power impact fault; s4, current regulation intervention; s5, closing the driving signal; and S6, latching the fault and giving an alarm. The output current peak value and the direct-current bus voltage are monitored at the same time through the digital controller, a double-threshold judgment mode is combined, rapid identification of the special fault of electric supply insertion impact is achieved, the response process is completely completed through software, the protection action is more timely, and the identification accuracy is higher.

The invention discloses a voltage-controlled oscillator circuit, comprising: a current control circuit module configured to receive an input voltage and generate a control current responsive to the input voltage; the ring oscillator circuit module is connected with the current control circuit module and comprises a multi-stage inverter and a current adjusting unit which are connected in series to form a ring; the current adjusting unit is respectively connected to the current control circuit module and each stage of the multi-stage phase inverter, and is configured to synchronously and symmetrically adjust the pull-up current and the pull-down current of each stage of phase inverter in the multi-stage phase inverter in response to the control current; and the output driving circuit module is connected with an output node of the ring oscillator circuit module so as to shape and drive the oscillation signal generated by the ring oscillator circuit module and output a clock signal with a duty ratio of 50%. The circuit structure is simplified, the chip area is saved, the oscillator is allowed to directly work at the target frequency instead of double frequency, and the overall power consumption is reduced.

The invention discloses an equalizing charge intelligent adjustment method and system for a lithium battery, electronic equipment and a storage medium, and the method comprises the steps: obtaining historical charging data and corresponding historical state parameters of each single battery in a lithium battery pack, and constructing a charging characteristic data set based on the historical charging data and the historical state parameters; performing feature extraction and classification on the charging characteristic data set of each single battery to obtain a charging characteristic analysis result; constructing a long short-term memory network model, and training the long short-term memory network model based on the charging characteristic analysis result to obtain a charging path prediction model; acquiring real-time state parameters of each single battery, performing single battery charging path prediction by using the charging path prediction model to obtain a prediction result, monitoring temperature parameters of each single battery at the same time, and generating a dynamic current adjustment strategy based on the prediction result and the temperature parameters; and adjusting the current distribution of each single battery in the lithium battery pack based on the dynamic current adjusting strategy.

The water dispenser comprises a water inlet assembly, a power supply assembly, a water flow pipeline, a water outlet assembly and an electrolytic bath, the water inlet assembly is communicated with an external water source, the electrolytic bath is respectively communicated with the water inlet assembly and the water outlet assembly through the water flow pipeline, and the power supply assembly comprises a power source and a current adjusting part. A series circuit is formed among the power supply, the current regulating part and the electrolytic bath; and a first throttle valve is arranged between the electrolytic bath and the water outlet assembly. The water dispenser can provide working currents with different magnitudes for the electrolytic cell through the power supply assembly, so that the reaction speed of the cathode and the anode of the electrolytic cell is adjusted, and water flows with different alkaline values / acid values are formed.

The invention discloses a low-power-consumption variable bias current control method for a high-speed magnetic suspension bearing, and belongs to the field of low-power-consumption control of a high-speed magnetic suspension bearing-rotor system, and the method comprises the following steps: S1, providing a bottom model support for PID control and current optimization control; s2, parameter setting of the PID controller is completed; s3, constructing a cooperative control system composed of a PID controller and a bias current regulation controller; and the bias current adjusting controller dynamically sets bias current in the acceleration stage and the stable rotation stage in sequence based on the state signals of the rotating speed and the vibration displacement in the acceleration stage and the stable rotation stage, so as to obtain an optimal bias current parameter. By adopting the low-power-consumption variable bias current control method of the high-speed magnetic suspension bearing, power consumption optimization of different working states is realized on the premise of ensuring system stability and dynamic stiffness.

The disclosure relates to a battery system. The battery system comprises a first battery cell unit and a second battery cell unit, each one comprising a respective current regulator arrangement configured to control charging of a respective battery cell unit. The battery system further comprises a control arrangement. The control arrangement is configured to selectively control charging of the first and second battery cell units, by controlling the current regulator arrangement of the first battery cell unit to charge the first battery cell unit, and simultaneously by controlling the current regulator arrangement of the second battery cell unit to heat said second battery cell unit. The heating is performed by a pulsed charging cycle, preferably wherein the pulsed charging cycle is delivered by pulses having a frequency of 1 Hz – 1 MHz, preferably 10 Hz – 100 kHz. The disclosure further relates to a computer program and a computer-readable medium.

This disclosure provides an external constant current circuit based on a DC-DC converter. The external constant current circuit includes a signal conversion operational amplifier circuit, a comparator circuit, a current regulation circuit, and a buffer. Specifically, the signal conversion operational amplifier circuit acquires the output current of the DC-DC converter, converts and amplifies the output current into a first voltage signal. The comparator circuit then compares the first voltage signal with an external reference voltage signal to output a second voltage signal. When the output current exceeds the constant current threshold, the current regulation circuit adjusts the current injected into the voltage feedback pin using the second voltage signal, thereby regulating the output current and maintaining it constant at the constant current threshold. This solves the problem of how to more efficiently implement constant current functionality in chips based on existing DC-DC converters.

The invention discloses a hierarchical collaborative battery energy storage system bypass equalization method, and relates to the technical field of electronics, a plurality of battery modules are connected in parallel in a battery energy storage system, each battery module comprises any number of battery monomers connected in series, and for any battery module, the equalization index of the battery module is calculated, and the equalization index of the battery module is calculated; when the equalization index exceeds a preset equalization threshold value, determining a target battery monomer of the battery module, the target battery monomer being a battery monomer with the lowest SOC predicted value in the battery module when the battery energy storage system is in a discharging state, or a battery monomer with the highest SOC predicted value in the battery module when the battery energy storage system is in a charging state; and bypassing the target battery monomer, and compensating the current of the battery module through the differentiated current regulation and control coefficient. According to the technical scheme, an additional hardware structure does not need to be added, the voltage drop influence caused by bypass equalization topology switching can be eliminated, and SOC equalization between the battery modules and SOC equalization of the battery monomers are achieved.

The invention provides a device and method for restraining plate stamping interface failure through pulse current regulation and control, and the system comprises a plate stamping module which is used for carrying out the stamping forming of a plate; the plurality of electrode clamps are detachably connected with the plate respectively, and electrodes are arranged on the electrode clamps; the current box is electrically connected with the electrode; the thermocouple is electrically connected with the current box and is used for acquiring temperature data of the plate; the ultrasonic emission sensor is electrically connected with the current box and is used for acquiring ultrasonic signal intensity data; the current box is configured to apply a heating current to the plated plate according to the temperature data, apply a preset high-strength low-frequency current to the plated plate after the temperature data reaches a target temperature, apply a low-strength high-frequency current to the plated plate when the ultrasonic signal strength reaches a preset strength in the punch forming process, continuously increase the density of the low-strength high-frequency current, and perform punch forming on the plated plate; the ultrasonic signal intensity is not increased any more. Therefore, the forming performance can be improved by introducing the high-strength low-frequency composite low-strength high-frequency pulse current.

The application discloses a decay control method and a current regulating device, and relates to the technical field of motor control. Actual voltage values corresponding to a motor driving circuit are acquired in a blanking time in a motor driving stage and a first preset time after the blanking time. The actual voltage values in respective first conduction times are compared with subsequent target voltage values. According to the relative size values between the respective actual voltage values and the target voltage values, deviation states between the actual voltage values and the target voltage values are recorded, so that respective corresponding decay times are determined in the two durations to realize an adaptive hybrid decay function. The motor driving circuit is controlled and processed according to the determined decay times. By adjusting the PWM off time to enter the next chopping cycle in advance, the motor current can reach the target current more quickly, noise and power consumption are reduced, and the chopping frequency is improved, so that the motor current ripple is less.

A power supply circuit, a digital addressable lighting interface (DALI) module, a lighting device, and a control method are disclosed. The power supply circuit includes: a power supply circuit (100); an regulating transistor (Q161) configured to be connected between the power supply circuit and a first output port (DA+); a first controller (U160) configured to control the regulating transistor (Q161) to be turned on or off; and a current regulating controller (A) configured to be connected between the power supply circuit and a second output port (DA-), the current regulating controller (A) also being connected between the regulating transistor (Q161) and the first controller (U160), wherein when the current at the second output port (DA-) is greater than a preset value, the current regulating controller (A) reduces the current flowing through the regulating transistor (Q161).