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34results about How to "Enhanced overcurrent protection" patented technology
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Overcurrent protection for solid state switching system
ActiveUS7369386B2Enhanced overcurrent protectionFlow interruptionDC motor speed/torque controlAc-dc conversionMOSFETClock rate
Current sensing resistors are connected directly to output terminals of MOSFETs forming the series switching stage of a PWM sinewave dimmer. An analog sensed current signal is coupled through an EMI resistant current link to comparators that provide an overcurrent indication in response to an overcurrent condition. A logic circuit overrides PWM control signals from a programmable controller, and operates drivers to render the series switching stage nonconductive and to render a clamp switching stage conductive until after the end of the current PWM duty cycle power on segment. The logic circuit sends an overcurrent signal through an optocoupler to an input of the programmable controller. The input of the controller is polled at a clock frequency for overcurrent signals and if the count exceeds a limit in any half cycle, or a maximum sum in sixteen half cycles of the AC supply, the series switching stage is rendered nonconductive and the clamp switching stage is rendered conductive pending a reset signal.
Owner:ELECTRONIC THEATRE CONTROLS
Lighting circuit and vehicle lamp having the same
ActiveUS20160081171A1Suppress fluctuationsEnhanced overcurrent protectionElectrical apparatusElectroluminescent light sourcesEffect lightCurrent sensor
A lighting circuit for a light source includes a drive circuit and an overcurrent protection circuit. The drive circuit supplies power to the light source. The overcurrent protection circuit is inserted between the drive circuit and the light source. The overcurrent protection circuit restricts a lamp current flowing into the light source so that the lamp current does not exceed an overcurrent threshold value. The overcurrent protection circuit includes a transistor, an inductor, a rectifier, a current sensor and an overcurrent protection controller. The current sensor generates a current detection signal according to the lamp current. The overcurrent protection controller controls ON / OFF of the transistor based on the current detection signal and the overcurrent threshold value. The transistor, the inductor and the rectifier are disposed in a T-shape.
Owner:KOITO MFG CO LTD
Backlight drive circuit, driving method thereof and liquid crystal device
ActiveCN103165085AImprove protectionShorten working lifeElectrical apparatusStatic indicating devicesMode switchConstant current
The invention discloses a backlight drive circuit, a driving method thereof and a liquid crystal device. The backlight drive circuit comprises a power module and a constant current driving chip, the power module comprises a first controllable switch, an adjustable load is connected between the first controllable switch and a backlight drive circuit grounding end, the adjustable load comprises a switching module capable of switching different resistance values, a control end of the switching module is coupled to a mode switch signal of the backlight drive circuit, and one end of the adjustable load, which is connected with the first controllable switch, is coupled to an over-current protection port of the constant current driving chip. According to the backlight drive circuit, the driving method thereof and the liquid crystal device, two and even more over-current protection (OCP) threshold values can be provided, and reliable over-current protection can be achieved whether in a 2 dimensional (2D) or 3 dimensional (3D) mode.
Owner:SHENZHEN CHINA STAR OPTOELECTRONICS TECH CO LTD
Overcurrent Detection Circuit and Power Supply Apparatus Provided Therewith
ActiveUS20070223164A1Enhanced overcurrent protectionImprove reliabilityTransistorDc-dc conversionStable stateEngineering
An overcurrent detection circuit (35) that detects an overcurrent state of a transistor (2) that outputs a current to a load (25) is provided with a start-up monitoring portion (31) that distinguishes between a start-up state and a steady state, an overcurrent monitoring portion (33) that monitors an overcurrent state of the transistor (2), and an output voltage monitoring portion (34) that detects whether the output voltage to the load (25) is normal or abnormal. The overcurrent monitoring portion (31) changes an overcurrent detection level while referring to information from the start-up monitoring portion (31) and the overcurrent monitoring portion (33).
Owner:ROHM CO LTD
Overcurrent detection circuit and power supply apparatus provided therewith
ActiveUS7468877B2Improve reliabilityEnhanced overcurrent protectionTransistorDc-dc conversionStable stateEngineering
An overcurrent detection circuit that detects an overcurrent state of a transistor that outputs a current to a load is provided with a start-up monitoring portion that distinguishes between a start-up state and a steady state, an overcurrent monitoring portion that monitors an overcurrent state of the transistor, and an output voltage monitoring portion that detects whether the output voltage to the load is normal or abnormal. The overcurrent monitoring portion changes an overcurrent detection level while referring to information from the start-up monitoring portion and the overcurrent monitoring portion.
Owner:ROHM CO LTD
Overcurrent protection device and method for inverter as well as inverter
ActiveCN102739090AEnhanced overcurrent protectionReduce risk of damageDc-ac conversion without reversalCurrent limitingEngineering
The embodiment of the invention provides an overcurrent protection device and method for an inverter as well as the inverter, which relate to the electrical and electronic field. The overcurrent protection device and method as well as the inverter are invented for efficiently improving overcurrent protection for the inverter at lower cost. The inverter comprises a power alternating circuit, a filtering circuit and the overcurrent protection device, and a change on output voltage of the filtering circuit exceeds the change on inductance current of the filtering circuit; and the overcurrent protection device comprises the following of: a voltage sampling unit which is used for sampling output voltage of the filtering circuit; a voltage comparison unit which is used for comparing the sampling output voltage sampled by the voltage sampling unit with preset voltage; and a current-limiting unit which is used for limiting current for the power alternating circuit when output voltage of the filtering circuit is reversed with theoretical output voltage and an absolute value of output voltage of the filtering circuit is larger than that of preset voltage. The overcurrent protection device and method for inverter as well as the inverter can be applied in a contravariant power supply.
Owner:HUAWEI DIGITAL POWER TECH CO LTD
Air conditioner compressor protection and control method and device
ActiveCN104009457APrevent overcurrentGood overcurrent protectionEmergency protective arrangements for limiting excess voltage/currentDriving currentCurrent limiting
The invention belongs to the technical field of compressor control, and provides an air conditioner compressor protection and control method and device. According to the method, when an over-current detection signal is received at a protection signal input end of an intelligent power module, whether a fault signal is output at a fault signal output end of the intelligent power module in a preset period of time or not is judged; if yes, a power source protection switch module is controlled to output power supply currents in a direct power supplying mode; otherwise, it shows that the intelligent power module is damaged, and therefore the power source protection switch module needs to be controlled to reduce the power supply currents in a current-limiting mode to a preset safety current range. Thus, on the condition that the intelligent power module is damaged, the abnormal over-current phenomenon is prevented from occurring in driving currents of an air conditioner compressor by reducing the power supply currents, a good over-current protection effect is achieved on the air conditioner compressor and the problem that in the prior art, when an intelligent power module is damaged, over-current protection of an air conditioner compressor cannot be realized is solved.
Owner:HANDAN MIDEA REFRIGERATION EQUIP +1
Power electronic reactor performance test device
InactiveCN107132440AEnhanced overcurrent protectionTest current controllableElectrical testingTraining setLoad following power plant
The invention discloses a power electronic reactor performance test device, which comprises a soft start module, an LCL filter module, a rectifier module, an energy storage module, an inverter module, a measurement module and a control unit module connected in sequence, wherein the input end of the soft start module is connected with an external power supply; the output end of the inverter module is connected with a tested reactor; the measurement module, the soft start module and the inverter module are connected with the control unit module respectively; the measurement module feeds sensor information back to the control unit module; and the control unit module controls the soft start module and drives the inverter module. The test device can simulate different working conditions, temperature rise test on the reactor is completed, on-load switching among test modules can be realized, shut down is not needed, the test work continuity is ensured, the time is saved, the working efficiency is improved, the test device is convenient to operate, and the device has the advantages that the power loss is little; the power is saved; a backstage can be connected in an online mode; and the test data can be transmitted in real time.
Owner:JIANGSU MODERN POWER CAPACITOR
DC-DC conversion circuit overcurrent protection circuit, method and display panel
ActiveCN109067155APreventing the Risk of Smoke and FireEnhanced overcurrent protectionStatic indicating devicesDc-dc conversionPower flowOvercurrent
The invention relates to a DC-DC conversion circuit overcurrent protection circuit, method and display panel. The overcurrent protection circuit comprises a first comparator (OP1) for comparing a DC voltage and a DC voltage. An OCP detect voltage (V1) and a first reference voltage (Vref1) in a DC conversion circuit output a first comparison result (EN1) to a logic processor; A second comparator (OP2) for comparing the OCP detection voltage (V1) and the second reference voltage (Vref2), and outputting a second comparison result (EN2) to the logic processor; A logic processor that judges DC based on the first comparison result (EN1) and the second comparison result (EN2); DC convert that working state of the circuit and output the corresponding control signal to the OCP current limiter; OCPcurrent limiter, according to the control signal, the corresponding overcurrent protection operation is performed on the DC-DC conversion circuit. The invention not only realizes the functions of theoriginal overcurrent protection circuit and the magnitude of the current triggering the overcurrent protection, but also limits the magnitude of the output current after the overcurrent protection occurs to prevent the risk of smoke and fire caused by the large current.
Owner:SHENZHEN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD
LED drive circuit and method based on voltage memory and segmented current limiting
ActiveCN103906314AAvoid damageImprove luminous efficiencyElectric light circuit arrangementEnergy saving control techniquesControl mannerEngineering
The invention discloses an LED drive circuit and method based on voltage memory and segmented current limiting. The circuit comprises a rectifying circuit, a voltage division circuit, a voltage increasing and reducing detection module, a voltage memory module, a comparator set, a control logic module, a high-voltage switch circuit, a detection resistor, a current detection comparator and an LED lamp string. According to the drive method of the circuit, according to the increasing and reducing characteristics of the directly-rectified direct-current ripple voltages, the segmented type lightening control mode is adopted in the load of the LED lamp string. The drive circuit solves the problem of the influence of the difference of voltage current characteristics of an LED chip adopted by the lamp string in the actual application on drive currents, the work current of the LED lamp string in the whole work period is limited within the designed largest current value Imax, the problems of lower brightness caused by undercurrents and damage, caused by overcurrents, to the LED chip are solved, the light-emitting efficiency of the LED lamp is improved, and meanwhile overcurrent protection can be carried out on an LED device well.
Owner:SOUTH CHINA UNIV OF TECH
Pre-charging control device for motor controller of electric vehicle and electric vehicle using pre-charging control device
InactiveCN102769315AGuaranteed reliabilityAvoid full chargeBatteries circuit arrangementsEmergency protective circuit arrangementsCapacitancePre-charge
The invention provides a pre-charging control device for a motor controller of an electric vehicle. The device comprises a power supply switch k1 and a pre-charging module, wherein one end of the power supply switch k1 is connected to the positive pole of the storage battery E1 of the electric vehicle, and the other end of the power supply switch k1 is connected to the positive pole of the capacitor bank Cz of the motor controller; the power supply switch k1 is used for controlling the on / off of the power supply loop of the motor controller; the pre-charging module is connected in parallel with the power supply switch k1 and is used for controlling the pre-charging state of the capacitor bank Cz of the motor controller. According to the pre-charging module, the phenomenon that the capacitor bank is always in a saturated state can be effectively avoided; the pre-charging control device has the overcurrent protection function, thus the capacitor bank is protected, and the service life of the capacitor bank is prolonged, so that the operating reliability of the motor controller is guaranteed, the electric quantity of the storage battery is not consumed by the pre-charging module, the travel distance of the electric vehicle can be prolonged, and a good energy-saving function is realized; and the pre-charging control device is simple in structure, low in manufacturing cost and easy to implement and popularize.
Owner:LONCIN MOTOR
DV/dt-detecting overcurrent protection circuit for power supply
ActiveUS7542258B2Enhanced overcurrent protectionReduce power lossTransistorAc-dc conversionControl signalPower switching
An overcurrent protection circuit for a power switching transistor wherein the power switching transistor has a control electrode and two main electrodes, the circuit comprising a circuit including a protection switch for sensing the rate of change of voltage with respect to time at one of the main electrodes of the power switching transistor and for controlling the protection switch to remove a control signal to the control electrode of the power switching transistor to turn off the power switching transistor if the rate of change exceeds a predefined value.
Owner:LUTRON TECH CO LLC
Method and system for determining pulse current in high-frequency pulse heating process of power battery
PendingCN113829894AHigh precisionEnhanced overcurrent protectionSpeed controllerVehicular energy storagePower batteryElectric machine
The invention discloses a method and a system for determining pulse current in a high-frequency pulse heating process of a power battery, and the method comprises the steps: calculating pulse current Ibattry through a formula in the process that the power battery discharges to store energy for U-phase, V-phase and W-phase stator windings of a three-phase motor; and in the process of charging the power battery by the U-phase stator winding, the V-phase stator winding and the W-phase stator winding of the three-phase motor, calculating the pulse current Ibattry by using another formula. According to the invention, the magnitude of the pulse current can be accurately determined in real time, the precision of pulse current control is improved, and overcurrent protection is facilitated.
Owner:深蓝汽车科技有限公司
Electric control device of engine extinguisher and control method of engine extinguisher
ActiveCN103758644AEnhanced overcurrent protectionImprove reliabilityEngine controllersMachines/enginesSignal processing circuitsSelf recovery
The invention discloses an electric control device of an engine extinguisher. The engine extinguisher comprises a flexible shaft, a motor used for driving the flexible shaft to stretch out and retract back and a detection switch which is turned on or turned off through triggering of the stretching operation and the retraction operation of the flexible shaft. The electric control device comprises a power circuit, a main controller, a first signal processing circuit, a second signal processing circuit, a motor driving circuit and a current sampling circuit used for sampling a driving current of the motor. The input end of the first signal processing circuit is connected with the signal output end of an ignition switch. The input end of the second signal processing circuit is connected with the signal output end of the detection switch. The input end of the main controller is respectively connected with the output end of the first signal processing circuit, the output end of the second signal processing circuit and the output end of the current sampling circuit and the output end of the main controller is connected with the input end of the motor driving circuit. The invention further discloses a control method of the engine extinguisher. According to the electric control device of the engine extinguisher and the control method of the engine extinguisher, the current overcurrent protection function and the self-recovery function when the current is abnormal are achieved and in addition, a motor driving current does not flow across the detection switch.
Owner:KEBODA TECH CO LTD +2
High frequency soft-switching technology switching power supply
InactiveCN102629830AReduce pollutionAccurate identificationEfficient power electronics conversionDc-dc conversionLow noiseSoft switching
The invention discloses a high frequency soft-switching technology switching power supply which is mainly for direct current switching power supply designed for the structure of a hybrid maglev system and comprises a DC / AC inverter control module, a first LC filtering module, a power frequency rectifier module, a high frequency rectifier module, a second LC filtering module and a transposition pulse width modulation module. Through the connection of the above modules, the switching power supply has the advantages of small volume, light weight, low noise, improved work efficiency and power density, less pollution to grid, fast dynamic response, stable output, and easy examination and repair.
Owner:江苏王牌电机制造有限公司
Lighting circuit and vehicle lamp having the same
ActiveUS9907151B2Prevent overcurrentSuppress fluctuationsElectrical apparatusElectroluminescent light sourcesCurrent sensorEffect light
A lighting circuit for a light source includes a drive circuit and an overcurrent protection circuit. The drive circuit supplies power to the light source. The overcurrent protection circuit is inserted between the drive circuit and the light source. The overcurrent protection circuit restricts a lamp current flowing into the light source so that the lamp current does not exceed an overcurrent threshold value. The overcurrent protection circuit includes a transistor, an inductor, a rectifier, a current sensor and an overcurrent protection controller. The current sensor generates a current detection signal according to the lamp current. The overcurrent protection controller controls ON / OFF of the transistor based on the current detection signal and the overcurrent threshold value. The transistor, the inductor and the rectifier are disposed in a T-shape.
Owner:KOITO MFG CO LTD
H-bridge switching circuit applied to epilepsy stimulation treatment
PendingCN110943727ASimple structureEnhanced overcurrent protectionElectronic switchingLDMOSPhysical medicine and rehabilitation
The invention discloses an H-bridge switching circuit applied to epilepsy stimulation treatment. The H-bridge switching circuit comprises an H-bridge switch capable of selecting positive and negativestimulation electrodes and a corresponding switch control circuit. According to the circuit, time division multiplexing stimulation can be carried out on a plurality of electrodes through one stimulation current source, and the polarities of the electrodes are selected to realize proper stimulation waveforms; the switch adopts an LDMOS tube, and can be well compatible with a conventional low-voltage process.
Owner:西安航天民芯科技有限公司
Electric control device and control method of engine flame extinguisher
ActiveCN103758644BEnhanced overcurrent protectionImprove reliabilityEngine controllersMachines/enginesSignal processing circuitsSelf recovery
Owner:KEBODA TECH CO LTD +2
Intelligent starting controller
PendingCN114237115AModification cost zeroShorten the timeProgramme controlComputer controlTransformerControl engineering
The invention discloses an intelligent starting controller which comprises a control panel and a control module, and the control panel and the control module are connected and controlled through a data line. One surface of the control panel is provided with a nixie tube, a control button and an indicating lamp, and the other surface of the control panel is provided with a control chip, a buzzer and a wiring port I; the control module is provided with a chip, a circuit board data line connection port and a transformer. The number of the nixie tubes is two, one nixie tube is used for displaying voltage values, and the other nixie tube is used for displaying starting time and working current and setting function codes. The controller has a self-coupling mode switching function and a star-delta starting mode switching function, the two modes can be mutually switched under the condition that a secondary control circuit does not need to be changed, great time is saved for temporary modification, only a primary circuit needs to be changed, and the modification cost of the secondary control circuit is zero.
Owner:浙江沪控电气有限公司
Overcurrent protection circuit and driving circuit of display panel
ActiveCN114336506AHigh insurance factorImprove protectionArrangements responsive to excess currentControl engineeringHemt circuits
The invention discloses an overcurrent protection circuit and a driving circuit of a display panel. The overcurrent protection circuit comprises a first control module, a second control module, a detection branch, a first detection module and a second detection module, one end of the detection branch is connected between the first control module and the second control module, and the other end is connected to the input ends of the first detection module and the second detection module; the current on the detection branch is the current to be detected, and when the first detection module detects that the current to be detected is smaller than a preset first threshold value, the second control module is controlled to be switched off to disconnect the load end; and when the second detection module detects that the current to be detected is greater than a preset second threshold value, the first control module is controlled to be switched off, and the power supply end is switched off. According to the over-current protection circuit, the problem that large current occurs at any one of the power supply end or the load end is solved, and the whole driving circuit can be turned off through the over-current protection circuit, so that over-current protection is realized.
Owner:HKC CORP LTD
Server VR chip OCP point setting method and control circuit
InactiveCN112510643APlay a protective effectEnhanced overcurrent protectionParameter calibration/settingArrangements responsive to excess currentComputer hardwareHemt circuits
The invention provides a server VR chip OCP point setting method and a control circuit, which are used when N loads are configured at the rear end of a server VR chip, can dynamically adjust the OCP points of the server VR chip according to in-place signals of the loads at the rear end of the server VR chip, and specifically comprises the following steps: configuring a resistor access circuit foreach of the N loads, wherein each resistor access circuit comprises a setting resistor accessed between the OCP pin of the server VR chip and the ground and a switch control circuit for controlling the conduction and disconnection of the circuit where the setting resistor is located, and the control end of the switch control circuit of each resistor access circuit is connected with an in-place signal of a corresponding load. The method and the circuit are used for improving the overcurrent protection of the server circuit.
Owner:INSPUR SUZHOU INTELLIGENT TECH CO LTD
An air conditioner compressor protection control method and device
ActiveCN104009457BPrevent overcurrentEnhanced overcurrent protectionEmergency protective arrangements for limiting excess voltage/currentDriving currentCurrent limiting
The invention belongs to the technical field of compressor control, and provides an air conditioner compressor protection and control method and device. According to the method, when an over-current detection signal is received at a protection signal input end of an intelligent power module, whether a fault signal is output at a fault signal output end of the intelligent power module in a preset period of time or not is judged; if yes, a power source protection switch module is controlled to output power supply currents in a direct power supplying mode; otherwise, it shows that the intelligent power module is damaged, and therefore the power source protection switch module needs to be controlled to reduce the power supply currents in a current-limiting mode to a preset safety current range. Thus, on the condition that the intelligent power module is damaged, the abnormal over-current phenomenon is prevented from occurring in driving currents of an air conditioner compressor by reducing the power supply currents, a good over-current protection effect is achieved on the air conditioner compressor and the problem that in the prior art, when an intelligent power module is damaged, over-current protection of an air conditioner compressor cannot be realized is solved.
Owner:HANDAN MIDEA REFRIGERATION EQUIP +1
An overcurrent protection method, device, storage medium and air conditioner
ActiveCN111181133BAccurate detectionReduces False Positive Overcurrent Protection IssuesCurrent/voltage measurementEmergency protection detectionRadarControl engineering
The invention discloses an overcurrent protection method and device, a storage medium and an air conditioner, and the method comprises the steps: detecting a power line of a compressor of the air conditioner through a radar with a set wavelength, and detecting the current flowing through the compressor of the air conditioner so as to obtain the current flowing through the compressor; determining whether the current flowing through the compressor is greater than a set overcurrent protection value or not; if the current flowing through the compressor is greater than the set overcurrent protection value, determining that an overcurrent phenomenon occurs in the current flowing through the compressor, and generating an overcurrent protection instruction; and starting a set overcurrent protection mechanism according to the generated overcurrent protection instruction so as to realize overcurrent protection of the air conditioner. According to the scheme, the problem that the overcurrent protection reliability is poor due to the fact that a current transformer needs to be adopted for detecting the current flowing through the compressor in the overcurrent protection of the air conditionercan be solved, and the effect of improving the overcurrent protection reliability is achieved.
Owner:GREE ELECTRIC APPLIANCES INC
Linear direct-current power source
PendingCN106444944AImprove overall efficiencyGuaranteed accuracy and stabilityElectric variable regulationMaintainabilityTransformer
The invention provides a linear direct-current power source comprising a voltage regulator and a power supply management circuit. The power source is characterized by further comprising an output adjustment circuit, an over-current protection circuit and an over-voltage protection circuit, the power supply management circuit comprises a transformer, three taps are arranged at the output end of the transformer and include the tap A, the tap C and the tap B in the middle, the alternating current output by the tap A and the tap C outputs first direct current through full-wave rectification to supply power to the voltage regulator, and the alternating current output by the tap B outputs second direct current through half-wave rectification to supply power to the output adjustment circuit. The overall efficiency of the power source is improved through the middle tap of the transformer, the loading capacity of the power source is improved by additionally arranging a transistor, a high-performance control chip LM723 serves as the kernel, output precision and stability are ensured, and over-current protection and over-voltage protection are achieved; all the circuits are composed of hardware, and the power source is simple in structure, easy to obtain, very high in reliability and maintainability and particularly suitable for being used in application occasions where low-voltage large-current power sources are used.
Owner:江苏惠中电气有限公司
Touch type monitor capable of achieving active informing when fault occurs
ActiveCN105781255AWith active protectionEnd passive defensive situationsBurglar alarm by openingEmergency protective arrangements for limiting excess voltage/currentEngineeringElectrical and Electronics engineering
The invention belongs to the technical field of mechanical and electrical integration, and relates to a touch type monitor capable of achieving active informing when a fault occurs. The touch type monitor is jointly composed of a fault monitoring power circuit, a lock hole cover plate, an alarm starting switch, a touch type circuit and a videography and warning circuit. The lock hole cover plate covers a lock hole switch and a lock hole together. When an event occurs, a tough signal is generated once the hand touches the lock hole cover plate, and after the touch signal is amplified through the touch type circuit, the videography and warning circuit is started to achieve videography and warning; and for events which cannot be stopped, either the lock hole continues to be opened or a door is barbarously burst open, the alarm starting switch immediately acts, the videography and warning circuit is started to achieve videography and warning, the fault monitoring power circuit is used in cooperation, and when the touch type monitor breaks down, the important functions of protection and display are achieved; and the problem that a burglar alarm is damaged so that an alarm cannot be given when an event occurs does not need to be considered any more, and the security performance of antitheft products is improved.
Owner:CHONGQING NINGLAI SCI & TRADE
Power delivery control and over current protection
ActiveUS11482853B2Eliminates and reduces loadingEnhanced overcurrent protectionApparatus without intermediate ac conversionEffective value measurementsSwitched currentControl engineering
Owner:INFINEON TECH AUSTRIA AG
A touch-type monitor that actively notifies when there is a fault
ActiveCN105781255BWith active protectionEnd passive defensive situationsBurglar alarm by openingEmergency protective arrangements for limiting excess voltage/currentEngineeringPower circuits
The invention belongs to the technical field of mechanical and electrical integration, and relates to a touch type monitor capable of achieving active informing when a fault occurs. The touch type monitor is jointly composed of a fault monitoring power circuit, a lock hole cover plate, an alarm starting switch, a touch type circuit and a videography and warning circuit. The lock hole cover plate covers a lock hole switch and a lock hole together. When an event occurs, a tough signal is generated once the hand touches the lock hole cover plate, and after the touch signal is amplified through the touch type circuit, the videography and warning circuit is started to achieve videography and warning; and for events which cannot be stopped, either the lock hole continues to be opened or a door is barbarously burst open, the alarm starting switch immediately acts, the videography and warning circuit is started to achieve videography and warning, the fault monitoring power circuit is used in cooperation, and when the touch type monitor breaks down, the important functions of protection and display are achieved; and the problem that a burglar alarm is damaged so that an alarm cannot be given when an event occurs does not need to be considered any more, and the security performance of antitheft products is improved.
Owner:CHONGQING NINGLAI SCI & TRADE
LED drive circuit and method based on voltage memory and segmental current limiting
ActiveCN103906314BAvoid damageImprove luminous efficiencyElectric light circuit arrangementEnergy saving control techniquesControl mannerEngineering
The invention discloses an LED drive circuit and method based on voltage memory and segmented current limiting. The circuit comprises a rectifying circuit, a voltage division circuit, a voltage increasing and reducing detection module, a voltage memory module, a comparator set, a control logic module, a high-voltage switch circuit, a detection resistor, a current detection comparator and an LED lamp string. According to the drive method of the circuit, according to the increasing and reducing characteristics of the directly-rectified direct-current ripple voltages, the segmented type lightening control mode is adopted in the load of the LED lamp string. The drive circuit solves the problem of the influence of the difference of voltage current characteristics of an LED chip adopted by the lamp string in the actual application on drive currents, the work current of the LED lamp string in the whole work period is limited within the designed largest current value Imax, the problems of lower brightness caused by undercurrents and damage, caused by overcurrents, to the LED chip are solved, the light-emitting efficiency of the LED lamp is improved, and meanwhile overcurrent protection can be carried out on an LED device well.
Owner:SOUTH CHINA UNIV OF TECH
A battery management system with charging high voltage interlock function
ActiveCN108045232BDetection reliabilityGuaranteed safe operationSpeed controllerElectric devicesWireless transceiverElectrical battery
The invention discloses a battery management system with a charging high-voltage interlocking function. The battery management system comprises a power battery pack, a high-voltage power interlockingmodule and a battery management module. A switch port of the power battery pack is connected with the battery management module. The output end of the battery management module is connected with the high-voltage power interlocking module through a wireless transceiver. The output end of the high-voltage power interlocking module is connected with a controllable high-voltage direct current contactor. The drive end of a motor controller is connected with a motor. The battery management module comprises a master controller and a CAN bus communication interface. The signal end of the master controller is connected with the wireless transceiver through the CAN bus communication interface. The system monitors a high-voltage loop of a battery electric vehicle in real time, and various types of feedback information is provided through a human-computer interaction interface, so that the high-voltage loop is effectively controlled in the starting and stopping processes of the battery pack and analarm is given in time when the high-voltage loop breaks down.
Owner:安徽特凯新能源科技有限公司
Flyback switching power supply for storage battery
InactiveCN108233718AReduce power consumptionHighly reliable charging functionBatteries circuit arrangementsDc-dc conversionComputer moduleAlternating current
The invention discloses a flyback switching power supply for a storage battery. The power supply comprises an alternating current input protection circuit, an EMI filter circuit, a rectification circuit, a filter circuit, a high-frequency switching power supply control module, a clamping circuit, a flyback transformer and a direct current output module; the alternating current input protection circuit, the EMI filter circuit, the rectification circuit, the filter circuit, the high-frequency switching power supply control module and the direct current output module are sequentially connected, the flyback transformer is connected with the filter circuit, the clamping circuit and the direct current output module separately, and the clamping circuit is connected with the high-frequency switching power supply control module. The flyback switching power supply can achieve the efficient, fast, low-power-consumption and high-reliability function of charging the storage battery.
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