42results about How to "With overcurrent protection function" patented technology

The invention discloses a cooking device having the function of over-current protection. The cooking device includes: an electromagnetic energy conversion circuit which is provided with an electromagnetic coil and a power switch unit; a drive circuit which is connected to an input end of the electromagnetic energy conversion circuit and is used for driving on-off of the power switch unit; a current sampling circuit which is used for acquiring the current of the electromagnetic coil; an over-current protection circuit which is connected to the current sampling circuit and generates a trigger signal when the current of the electromagnetic coil is greater than a preset current value; and a controller which is connected to the drive circuit and the over-current protection circuit and closes a control signal being output to the drive circuit after receiving the trigger signal. The cooking device can perform real-time monitoring on the current of the electromagnetic coil through the current sampling circuit, and can timely stop output of a drive signal in the drive circuit during over-current, so that the power switch unit such as an IGBT, can be protected, and damage to the power switch unit such as an IGBT, due to over-current, can be prevented.

The invention discloses a power battery comprising a high-voltage protector. The power battery comprises a high voltage power distribution system, a battery management system and a battery pack system, wherein a power input of the high voltage power distribution system is connected with a power output of the battery pack system through a connector, and a power output of the high voltage power distribution system is connected with a plurality of loads through a plurality of connectors. A power control terminal of the high voltage power distribution system is connected with a power control terminal of the battery management system through a connector, and a control input of the high voltage power distribution system is connected with a control output of a superior controller through a connector. The power battery system not only comprises the battery management system and the battery pack system, but also comprises the high voltage power distribution system, so that the problem of multiple wire harnesses is effectively solved, the integration level of the power battery is improved, and the size of the power battery can be smaller. The power battery has the functions of loop protection, pre-charge, and overcurrent protection. The power battery also has a real-time maintenance switch, so that the safety of workers can be ensured during the battery maintenance.

The invention relates to the light-emitting diode (LED) manufacturing field and provides a LED driving power supply. The LED driving power supply comprises a power input end, an electro magnetic compatibility (EMC) circuit, a rectifying circuit, a voltage conditioning circuit, a filtering circuit, an output current voltage detecting circuit and an LED lamp at the output end of the output current voltage detecting circuit, and further comprises a constant current and constant voltage controlling circuit, wherein the power input end, the EMC circuit, the rectifying circuit, the voltage conditioning circuit, the filtering circuit, the output current voltage detecting circuit and the LED lamp are connected in sequence, the constant current and constant voltage controlling circuit is connected with an output end of the output current voltage detecting circuit and an input end of the voltage conditioning circuit, an inductance and a piezoresistor are arranged between the rectifying circuit and the voltage conditioning circuit, the inductance is connected with the rectifying circuit and the voltage conditioning circuit in series, the piezoresistor is connected with the rectifying circuit and the voltage conditioning circuit in parallel, and the input end of the piezoresistor is connected with the output end of the inductance. The LED driving power supply has the advantages that elements with big sizes, high failure rates and high prices are greatly reduced, the structure is simple and reasonable, the cost is lowered and application is stable and reliable. The inductance is added between the rectifying circuit and the voltage conditioning circuit, so that undesirable effects due to the fact that different-mode signals transit to a power grid are restrained, meanwhile the piezoresistor is added, and thereby the ability of the power supply to reject outside surge is improved.

The invention relates to an intelligent charger with a universal serial bus (USB) interface. AC 220V current sequentially passes through a sorting circuit, a filtering voltage-stabilization circuit and a voltage transformation circuit and then is output to a USB device to be charged, the output end of the voltage transformation circuit is connected with a charging state detection circuit, a USB interface of the USB device to be charged is connected with a pull and plug detection circuit, the output ends of the charging state detection circuit and the pull and plug detection circuit are connected with a device comprehensive state logic operation circuit, the output end of the device comprehensive state logic operation circuit is connected with an on/off control circuit, the output end of the on/off control circuit is connected with the output end of a rectification circuit and can be used for switching on/off the input of a power supply, and the output end of the voltage transformation circuit is used for controlling duty cycle of a switching tube in the voltage transformation circuit according to a control signal output from a voltage-stabilization control circuit. By the intelligent charger, the access and the pull-out of a charging device are intelligently detected, power is automatically cut off from a source head after the device is pulled out, charging is automatically carried out after the device is inserted, and power is automatically cut off after the charging is full; and meanwhile, the intelligent charger has an overcurrent protection function, and the power supply is automatically cut off when overcurrent occurs so as to prevent an accident.

The invention provides an over-current protection and startup recovery circuit for a solar photovoltaic controller. According to the technical scheme adopted for the circuit, a current sampling resistor is connected to a discharging circuit for a load of a storage battery in series, a same-phase proportional amplifying circuit composed of an operational amplifier and a plurality of resistors is adopted to amplify a voltage signal on the sampling resistor, then the voltage signal is sent to a voltage comparer composed of an operational amplifier and a plurality of resistors for comparison and high and low level output, and the voltage comparer is connected with the control end of a drive control circuit to control on and off of a switch tube. In addition, a recovery control circuit is arranged at the same-phase input end of the operational amplifier of the voltage comparer of the circuit so that intelligent recovery control can be performed through an I/O port of a single chip microcomputer. A state monitoring circuit is arranged at the output end of the voltage comparer. By means of the circuit design, the working stability and the capacity of automatically resuming work after breakdown of the solar photovoltaic controller are improved.

The invention relates to a Wi-Fi plug with electric leakage and over-current protection functions. The Wi-Fi plug comprises a power line, a power source module, a microcontroller, a Wi-Fi module, an electric leakage detection module, an over-current protection module and an on-off control circuit arranged on the power line. The power source module is connected with the microcontroller and the Wi-Fi module respectively. The electric leakage detection module and the over-current protection module are connected with the microcontroller. The microcontroller is connected with an intelligent household appliance control mainboard and the on-off control circuit. The invention further provides an intelligent household appliance control system. The intelligent household appliance control system comprises the Wi-Fi plug and the intelligent household appliance control mainboard, a wireless router capable of communicating with the Wi-Fi plug, a server connected with the wireless router and a mobile control terminal capable of communicating with the server after having access to the internet. The Wi-Fi plug has the functions of power supply and communication and further has the functions of electric leakage protection and over-current protection, and by means of the intelligent household appliance control system applying the Wi-Fi plug, intelligent household appliances can be controlled in a remote mode and protected in an all-around mode at the same time.

The invention discloses a numerical-control direct-current voltage source. Reference voltage is provided by a D/A (digital to analog) conversion module, and is outputted by a power operational amplifying module, the outputted voltage is sampled and fed back to the input end of the power operational amplifying module for closed loop control, the outputted voltage can reach several dozens of volts, the accuracy can reach 1 per mill, and the bidirectional voltage output can be realized without an output polar reversing circuit. In addition, the numerical-control direct-current voltage source also has an overcurrent protection function and an outputted voltage and current measuring and displaying function.

The invention belongs to a power supply of an illumination light source, in particular to a controllable LED load current driving circuit, which is characterized in that: an over-current, over-voltage, over-heat and under-voltage signal sampling circuit and an over-current, over-voltage, over-heat and under-voltage protection circuit are connected between a constant-current and constant-voltage output circuit and a single-ended flyback DC/DC power converter; a voltage fluctuation signal extracted by the over-current, over-voltage, over-heat and under-voltage signal sampling circuit passes through the over-current, over-voltage, over-heat and under-voltage protection circuit and then controls the output of the single-ended flyback DC/DC power converter, so that the constant-current and constant-voltage output circuit outputs stable voltage and current; and the over-current, over-voltage, over-heat and under-heat protection circuit adopts a current control mode PWM/PFM generator. In the invention, the controllable LED load current driving circuit is provided, has high power and high reliability and is slightly changed with factors, such as input voltage, temperature and the like.

The present invention provides a single-ended flyback constant current circuit for a light-emitting diode (LED). The constant current circuit includes an electromagnetic compatibility (EMC) and surge current suppression circuit, a rectifier filter circuit, a single-ended flyback DC/DC power converter, and a constant current constant voltage output circuit. Through adoption of the single-ended flyback constant current circuit for the LED, an adjustment service life of the LED lamp can be prolonged effectively, further, an adjustment accuracy of the LED is greatly improved, and fine adjustments such as lamp brightness adjustment can be carried out in a smaller range.

A three-crystal overcurrent protection type A circuit voltage regulator chip in the load dump low overvoltage region, including: the emitter of the first transistor Q1 is grounded, the collector of Q1 is connected to the positive pole B+ of the power supply through the resistor R1, and the collector is also connected to the third transistor The gate of Q3 is connected to the input terminal of the energy storage delay unit 5; the source of the transistor Q3 is grounded E, and its drain is connected to the collector of the second transistor Q2, and the base of the transistor Q2 is connected to the output terminal of the energy storage delay unit 5, and the energy storage delay unit The ground terminal of 5 is grounded, the emitter of transistor Q2 is connected to the base of transistor Q1 through the threshold adjustment unit 4, and the drain of transistor Q3 is the excitation terminal F; the sampling unit 7 is connected to the positive pole of the power supply and the ground, and its output terminal is connected to transistor Q1 through the reference unit 8 The freewheeling unit 9 is connected between the excitation terminal and B+; it has simple chip circuit, high withstand voltage, overcurrent protection function, good temperature resistance, low load dump overvoltage zone, low cost, and wide application range , The advantages of high reliability.

The invention discloses an automobile low-speed-driving alarm system. The automobile low-speed-driving alarm system comprises an automobile-speed collecting unit, a gear signal collecting unit, a microprocessor and an alarm unit. The automobile-speed collecting unit and the gear signal collecting unit are connected with the input end of the microprocessor respectively, and the output end of the microprocessor is connected with the alarm unit. The automobile low-speed-driving alarm system of the structure has the advantages that automatic low-speed alarm is achieved; the mode of alarm is multiple; the multiple functions such as automobile backing reminding, charging reminding and electric quantity reminding are integrated; the under-voltage detection function, the overvoltage protection function and the over-current protection function are achieved.

The invention discloses an automatic control circuit for a high-stability streetlamp and with an overcurrent protection function. The automatic control circuit is characterized by being mainly composed of a diode rectifier U, a fuse FU, an audion VT1, a phototriode VT2, an audion VT3, an audion VT4 and the like. The automatic control circuit can automatically control the streetlamp to be turned on when ambient brightness is not high enough, and can automatically control the streetlamp to be turned off when ambient brightness is high enough, so that the degree of automation is high, the street lamp does not need to be manually turned on or off, the situation that a person forgets to turn off a street lamp under sufficient light during the daytime, and consequently a large amount of electric energy is wasted can be avoided, and electric energy is saved to a great extent. The automatic control circuit can well filter out alternating components in direct-current voltage, so that the streetlamp works more stably, and the lighting effect of the streetlamp is improved.

The invention provides a bridge type LC (inductance capacitance) resonance circuit with an overcurrent protection function. The bridge type LC resonance circuit comprises a switch circuit unit, a resonance circuit unit and an overcurrent protection unit, wherein the switch circuit unit is used for controlling the on-off state of driving signals of external loads, the resonance circuit unit is connected with the switch circuit unit and is used for generating high voltage, the overcurrent protection unit is connected with the switch circuit unit and the resonance circuit unit and is used for sampling current output by the switch circuit unit, and the switch circuit unit is forcibly switched off when the current is excessive. The bridge type LC resonance circuit with the overcurrent protection function is implemented in a zero-current switch-on mode, the circuit is protected, and simplicity and convenience are realized.

The invention relates to an air blowing heating intelligent control module. With the air blowing heating intelligent control module adopted, defects in the prior art can be eliminated. According to the technical schemes of the invention, the air blowing heating intelligent control module includes a three-phase Hall-free direct current motor, a motor driving module, a power supply module, a CPU control driving module, a protection module and a modulation module; the input end of the power supply module is connected with a power source; the output end of the power supply module is electrically connected with the input end of the motor driving module and the CPU control driving module; the output end of the power supply module is electrically connected with the CPU control driving module and the three-phase Hall-free direct current motor respectively through the protection module; the driving end and the feedback end of the motor driving module are both electrically connected with the CPU control module; the output end of the motor driving module is electrically connected with the input end of the three-phase Hall-free direct current motor; the CPU control driving module is also electrically connected with the modulation module.