43results about How to "Current limit" patented technology

The present invention relates to a power semiconductor device for an igniter, which protect a semiconductor switch member in the overheat state and avoid the error ignition occurring at an inappropriate time followed by the current shut off. A power semiconductor device 5 for an igniter comprises: a semiconductor switching device 4 causing a current to flow through a primary side of an ignition coil 6 or shutting off the current flowing through the primary side of the ignition coil; an integrated circuit 3 driving and controlling the semiconductor switching device; and a temperature sensing element 43 sensing temperature of the semiconductor switching device 4, wherein the integrated circuit including an overheat protection circuit limiting a current through the semiconductor switching device to a value lower than a current through the semiconductor switching device 4 during normal operation, when temperature sensed by the temperature sensing element 43 is over predetermined temperature.

The invention discloses an anti-thunder overvoltage protection device. The anti-thunder overvoltage protection device comprises a piezoresistor, a positive temperature coefficient thermistor and a gas discharge tube, wherein the positive temperature coefficient thermistor is connected with the gas discharge tube in parallel and then connected with the piezoresistor in series; the positive temperature coefficient thermistor and the piezoresistor form a thermal coupling relationship. The piezoresistor, the positive temperature coefficient thermistor and the gas discharge tube can be packaged into a whole, or the piezoresistor and the positive temperature coefficient thermistor are packaged into a whole, thus a packaged body is formed, and the gas discharge tube is located outside the packaged body. The anti-thunder overvoltage protection device not only can restrain operation overvoltage and fault power frequency overvoltage, but also can have the protection function of a normal voltage-sensitive element when lightning stroke pulse overvoltage occurs.

The invention discloses a high-power triggering and boosting circuit based on linear driving. The high-power triggering and boosting circuit based on linear driving is mainly composed of a rectification filter circuit, a triggering circuit connected with the rectification filter circuit, a boosting circuit connected with the triggering circuit, a two-stage low-pass filtration and amplification circuit connected with the boosting circuit. The high-power triggering and boosting circuit based on linear driving is characterized in that a linear driving circuit is arranged between the filter circuit and the triggering circuit and is composed of a driving chip U1, a triode VT5, a triode VT6, a triode VT7, a triode VT8, a capacitor C14, a resistor R16 and the like, the positive electrode of capacitor C14 is connected with the filter circuit, the negative electrode of the capacitor C14 passes through a resistor R15 and then is connected with an IN1 pin of the driving chip U1, one end of the resistor R16 is connected with the collector electrode of the triode VT5, and the other end of the resistor R16 passes through a resistor R17 and then is connected with the base electrode of the triode VT7. According to the high-power triggering and boosting circuit based on linear driving, the linear driving circuit is adopted, in this way, higher power can be output by the circuit, high stability can be maintained, and the operating requirement of high-power production equipment is met.

The invention discloses a low-noise high-frequency converter. The low-noise high-frequency converter is characterized by being composed of a transformer T1, a transformer T2, a linear driving circuit connected with the primary side of the transformer T1, a mixer circuit connected with the secondary side of the transformer T1, a first switching circuit connected with the mixer circuit, a processing circuit connected with the mixer circuit and the first switching circuit, and a second switching circuit connected with the output end of the processing circuit; the primary side of the transformer T2 is connected with the second switching circuit. The linear driving circuit is composed of a driving chip U, a triode VT4, a triode VT5, a triode VT6, a triode VT7, a polar capacitor C7 and the like, wherein the positive pole of the polar capacitor C7 serves as the circuit input end, and the negative pole of the polar capacitor C7 passes through a resistor R7 and then is connected with an IN1 pin of the driving chip U. According to the low-noise high-frequency converter, the linear driving circuit is adopted, and thus the converter is made to generate quite low noise when working under high-frequency working conditions, and is suitable for occasions requiring low noise.

The invention relates to a method for operating a starter (203) of a vehicle, according to which a physical quantity is measured, characterized in that, depending on the measured physical quantity, a starter current of the starter (203) is limited or not limited, wherein, in the event that the starter current is limited, the limitation is ended after a predetermined time. The invention further relates to a device (201) for operating a starter of a vehicle and to a control program.

The invention discloses an automatic emergency lamp system sensitive in induction. The automatic emergency lamp system comprises an emergency lamp XL, a battery GB, a light control circuit connected with the positive pole and the negative pole of the battery GB, a switching circuit connected with the output terminal of the light control circuit, a time delay circuit connected with the output terminal of the switching circuit, and an amplifying circuit connected with the output terminal of the time delay circuit, wherein the emergency lamp XL is connected with the amplifying circuit. The automatic emergency lamp system is characterized by also comprising a linear driving circuit connected between the light control circuit and the switching circuit, wherein the linear driving circuit comprises a driving chip U1, an audion VT2, an audion VT3, an audion VT4, an audion VT5, a polar capacitor C3 and the like; the positive pole of the polar capacitor C3 is connected with the light control circuit and the negative pole of the polar capacitor C3 passes through a resistor R7 and then is connected with an IN1 pin of a driving chip U. The automatic emergency lamp system is provided with the linear driving circuit, and can improve the sensitivity of the emergency lamp.

The invention discloses an electrical system based on linear driving. The electrical system based on linear driving is mainly composed of a front-end processing circuit, an amplification circuit connected with the output end of the front-end processing circuit, a pulse rectifying circuit connected with the output end of the amplification circuit, a fine adjustment circuit connected with the pulse rectifying circuit and a warning circuit connected with the output end of the pulse rectifying circuit. The electrical system based on linear driving is characterized in that a linear driving circuit is arranged between the amplification circuit and the pulse rectifying circuit and is composed of a driving chip U, a triode VT2, a triode VT3, a triode VT4, a triode VT5, a polar capacitor C7 and the like, the positive electrode of the polar capacitor C7 is connected with the amplification circuit, and the negative electrode of the polar capacitor C7 passes through a resistor R16 and then is connected with an IN1 pin of the driving chip U. According to the electrical system based on linear driving, due to the fact that the linear driving circuit is arranged, the electrical system can be more stable.

For converting a first DC voltage to a second DC voltage, a first bridge circuit comprised in a power converter is controlled to convert the first DC voltage to a first AC voltage. The first AC voltage is transformed to a second and possibly further AC voltage. The second and each possibly further AC voltage is converted to a DC voltage by respective bridge circuits. To increase efficiency of the power converter switches of the power converter are controlled to operate in soft switching. Thereto a duty cycle of each AC voltage is controlled. In an embodiment, a half-cycle voltage-time integral of each AC voltage is controlled to be substantially equal.

The embodiment of the invention relates to a converter circuit, a corresponding device and a method. The converter circuit includes a half-bridge power circuit having first and second switches between the input node and the current node and between the current node and ground, respectively. The inductor is coupled between the current node and the output node. A logic control circuitry is configured to switch the first and second switches to a current recirculation state and a current charging state. The logic circuitry is configured to switch the switch from the current recirculation state to the current charging state as a result of the voltage indicator signal from the output voltage comparator being asserted while initiating an on-time counter signal having an expiration value, and switches the switch from the current charging state to the current recirculation state as a result of a combination of the on-time counter signal having reached its expiration value with the voltage indicator signal from the voltage comparator being de-asserted.

The invention discloses a device for current limiting protection of a load or an output. The device includes a power supply module, a current limiting circuit, a reset circuit and a load. The current limiting circuit includes a field effect transistor, an inductor, and the zeroth to third resistors. Among them: the field effect transistor, the inductor, and the zeroth resistor are connected in series with the load, and the zeroth to third resistors form a feedback network with the field effect transistor. When the current exceeds the set current threshold, the resistance value of the zeroth resistor will be instantaneously changed by The low resistance value becomes high resistance value, and since the resistance value of the zeroth resistor becomes high resistance value, the feedback network formed by the zeroth to third resistor and the field effect transistor will set the gate voltage of the field effect transistor to the limit The potential of the current flow can be quickly and effectively realized to limit the current, realize the rapid response to the instantaneous large current, and effectively protect the circuit components.

The invention relates to the technical field of integrated circuits, in particular, to a voltage-controlled oscillator, an integrated chip, and an electronic device. The voltage-controlled oscillatorcomprises a resistor unit, a current mirror unit, a bias unit, and an oscillating unit. The current mirror unit responds to a first bias voltage provided by the bias unit to carries out bias processing on a voltage of a first node at a first current path and a voltage of a third node at a third current path to generate a first bias voltage and is also used for responding to resistance configuration of the resistor unit and adjusting a third current flowing through the third current path, wherein the first current flowing through the first current path is equal to the third current. Therefore,with configuration of the resistance corresponding to the resistor unit, the charging and discharging time of the capacitor of the oscillating unit can be indirectly adjusted to change the oscillationperiod of the oscillating unit and thus the changed oscillation period is closer to a desired oscillation period, so that the output accuracy of the oscillation period is improved.

The invention discloses an anti-thunder overvoltage protection component which comprises a piezoresistor disc, a positive temperature coefficient thermistor disc and a gas discharge tube, wherein the piezoresistor disc, the positive temperature coefficient thermistor disc and the gas discharge tube are integratedly packaged; the first common terminal of the positive temperature coefficient thermistor disc and the gas discharge tube is a first leading-out terminal; the second common terminal of the positive temperature coefficient thermistor disc and the gas discharge tube is connected with one end of the piezoresistor disc; the other end of the piezoresistor disc is a second leading-out terminal. The anti-thunder overvoltage protection component can restrain the switching overvoltage and fault power frequency overvoltage, and can play the protective role of a normal pressure cell in case of a thunderstrike pulse overvoltage.

The invention discloses a current measurement method and device based on single-axis magnetic sensing chips. The method comprises the steps: receiving the magnetic field intensity, measured by each single-axis magnetic sensing chip, of a to-be-measured cable at the current position, wherein the single-axis magnetic sensing chips are located in the same plane or mutually parallel planes; obtainingthe relative position of each single-axis magnetic sensing chip; and calculating the current value of the to-be-measured cable according to the relative positions of the single-axis magnetic sensing chips and the magnetic field intensity measured by the single-axis magnetic sensing chips. According to the technical scheme disclosed by the invention, non-closed-loop measurement can be realized by utilizing the single-axis magnetic sensing chips, so that the cumbersome degree of current measurement can be reduced, and the current value of a to-be-measured cable in almost any scene can be measured, so that the current measurement is not limited by the installation scene of the to-be-measured cable.