171results about How to "Stable output current" patented technology

The invention discloses a band-gap reference voltage circuit. A current source is additionally arranged, a reference voltage output end and a power source end are arranged, density of current flowing through a second triode is n times of the density of current flowing through a first triode in a micro current source unit, a power supply end of a difference amplifier unit is connected with the power source end, a collector of a third triode is connected with the power source end through the current source, an emitting electrode of the third triode is connected with an input end of the micro current source unit, the collector of the third triode is connected with an output end of the difference amplifier, and a connecting point and a base electrode of the third triode are both connected to a reference standard output end. As an implementation mode of the micro current source unit, resistance value of a third resistor is n times of that of a second resistor, and the first triode is symmetrically matched with the second triode. The band-gap reference voltage circuit is high in accuracy, low in power source noise, small in temperature coefficient, low in power, capable of directly generating reference voltage over 1.25V, needless of being connected with a peripheral resistor for working and suitable for generating reference voltage inside a chip.

The invention provides a battery management method, a battery management device and equipment powered by a battery, and relates to the technical field of communication. Harmful effects caused by bias current and ring current can be controlled effectively, and the bias current and the ring current are generated when batteries or battery packs of different capacities and materials are directly utilized in parallel. The method is capable of managing two or more than two parallel batteries or battery packs in a circuit, and a parallel branch is formed by the branch where each parallel battery or battery pack is located. The method comprises: whether a current value of a target parallel branch is larger than a preset current value or not is detected; when the detected current value of the target parallel branch is larger than the preset current value, the current value of the target parallel branch is adjusted to be smaller than or equal to the preset current value. The battery management method is used for management of parallel batteries.

The invention provides a method for simultaneous and integrated electric energy outputting by a solar cell fabric unit and a friction nano generator. The method comprises: the solar cell fabric unit is formed by direct intersected braiding or wound connection of photo-anodes having fiber structures and counter electrodes of the fiber structures; the friction nano generator is formed by two electrodes having different interfacial electron adsorption capacities, wherein one electrode is equipped with negative electricity and the other electrode is equipped with positive electricity after the two electrodes are in contact and then are separated; elements having unidirectional conduction characteristics are connected to the photo-anodes or counter electrodes of the solar cell fabric unit and then parallel connection with the two electrodes of the friction nano generator is realized, thereby matching electrical output characteristics of the solar cell fabric unit and the friction nano generator and thus realizing simultaneous and integrated outputting. Therefore, a technical problem that the friction nano generator with the high output impedance is easy to be in a shot circuit state by the low-impedance solar cell can be solved. The provided integration solution has advantages of light weight, easy integration and prevention of manual adjustment all the time.

The invention discloses an LED driving circuit and a driving method. The driving circuit comprises a control chip, a constant current driving module, a first switch tube, a second switch tube and a third switch tube, wherein a first LED particle, the first switch tube and the constant current driving module are connected in series to form a loop; a second LED particle, the second switch tube and the constant current driving module are connected in series to form a loop; a third LED particle, the third switch tube and the constant current driving module are connected in series to form a loop; the control chip is electrically connected to the control end of the constant current driving module, the control end of the first switch tube, the control end of the second switch tube and the control end of the third switch tube. According to the LED driving circuit and the driving method, working conditions of different LED particles can be controlled according to luminance, color temperature and color requirements set by a user to achieve the set effect, output current is stable without current overshoot, and extra power consumption is reduced.

The invention relates to a self-feedback linear galvanostat integrating an adjustable thermistor, which belomngs to the technical field of a semiconductor power device. The self-feedback linear galvanostat comprises a junction-type field effect transistor (JFET) and an adjustable thermistor, which are integrated together, wherein one end of the adjustable thermistor is connected with a JFET source electrode, and the other end is connected with a grid electrode of the JFET. The self-feedback linear galvanostat is centralized on the adjustable thermistor, and the adjustable thermistor can obtain a resistance value meeting the requirement of the output current through a laser cutting way, so that different types of products can be obtained in the same batch. The thermistor is a positive temperature coefficient, under the working situation, the temperature is increased, the resistance is increased, the output current is reduced, and the reliability of an application system is protected. The self-feedback linear galvanostat has advantages of high integration, stability in output current, adjustability of the current and good temperature property and can be applied to the fields such as light emitting diode (LED).

The invention discloses a circuit structure of a narrow-pulse-width high-repetition-frequency pulse current source. The circuit structure is characterized by comprising an adjustable reference voltage input module (1), a current source module (2), an adjustable narrow pulse generating and shaping module (3), a high-speed selection module (4) and a current mirror module (5), wherein the adjustable reference voltage input module (1), the current source module (2) and the current mirror module (5) are electrically connected in sequence; and the adjustable pulse generating and shaping module (3), the high-speed selection module (4) and the current mirror module (5) are electrically connected in sequence. By adopting the circuit structure, the pulse width, the current magnitude and the pulse frequency can be adjusted. Moreover, the circuit structure has the advantages of narrow pulse width, high repetition frequency, high current, small overshoot and steep leading edge.

The invention discloses a current mirror circuit, which comprises an n-channel metal oxide semiconductor (NMOS) tube N1, an NMOS tube N2, an NMOS tube N3 and a p-channel metal oxide semiconductor (PMOS) tube P1, wherein the drain of the NMOS tube N1 is connected with a circuit voltage drain drain (VDD) through a constant current source Ib1, the grid of the NMOS tube N1 is in short-circuit connection with the drain of the NMOS tube N1, the grid of the NMOS tube N1is grounded through a capacitor C2, and the source of the NMOS tube N1 is grounded; the drain of the NMOS tube N2 is connected with the output end through a switch S1, the grid of the NMOS tube N2 is in short-circuit connection with the drain through a capacitor C1, and the source of the NMOS tube N2 is grounded; the drain of the NMOS tube N3 is connected with the circuit voltage drain drain (VDD) through a constant current source Ib2, the grid of the NMOS tube N3 is connected with grids of the NMOS tube N1 and the NMOS tube N2, and the source of the NMOS tube N3 is grounded; and the source of the PMOS tube P1 is connected with the grid of the NMOS tube N1, the grid of the PMOS tube P1 is connected with the drain of the NMOS tube N3 and the drain of the PMOS tube P1 is grounded. According to the current mirror circuit, when the voltage of a node A exceeds a certain value, the current release capacity of the node A is improved by a feedback circuit inside an accelerating circuit to quickly and steadily output current, and time for outputting steady current can be shortened.

The invention provides a power management circuit and a chip thereof. The power management circuit comprises a pre-voltage stabilizing module, a linear voltage stabilizing module, and a bias current generation module. Input voltages sequentially pass through the pre-voltage stabilizing module, the linear voltage stabilizing module, and the bias current generation module to generate a pre-stabilized voltage VPR, a voltage stabilizing voltage VREG, and a bias current Ibias separately. The power management circuit in the chip provides a power supply voltage and a current bias for modules in the chip. The invention has the advantages that the circuit can generate stable voltages at high input voltage conditions to provide stable power supply for each module in a power management IC (IntegratedCircuits); output currents are stable, and the driving capacity is large; the power consumption of the power management circuit is low, helping to control the overall power consumption of the chip; and the circuit structure is easy to realize so as to be suitable for engineering application.

The invention belongs to the field of electronic technology, and relates to an inductively coupled power transfer (ICPT) device with a pull-down auxiliary switch. A group of pull-down auxiliary switch branch is added to an LC resonant single tube inverting bipolar inverting circuit topology used by the existing ICPT device, the branch comprises an auxiliary switch tube, a main switch tube and the auxiliary switch tube have the same switch frequency, soft switch control can be both realized, no shoot-through problem exists between the two tubes, and the reliability is improved. In a condition of keeping the advantages of the original circuit, voltage borne at two ends of the switch tube is reduced to 2/3 the original voltage, the device can adopt a metal oxide transistor as a switch tube, the switch frequency can reach more than 83kHz, and as the auxiliary switch tube is short in turn-on time and low in power consumption, a technical scheme for furthering reducing the size and the weight of the ICPT device and reducing the cost is provided.

An output driver has an output multiplexor and an output current driver. The output multiplexor receives a data signal and outputs a q-node signal. The output current driver receives the q-node signal and drives a bus based on the q-node signal. The output multiplexor processes the data signal in various ways to generate the q-node signal. The output current driver is responsive to current control bits to select a amount of output drive current. In addition, the output multiplexor is controlled such that the output impedance of the output current driver is maintained within a predetermined range.

The invention discloses an electronic system, a power amplifier and a temperature compensation method of the power amplifier. The power amplifier comprises a bias circuit, an output stage circuit and a compensation circuit. The bias circuit is used for providing reference voltage. The reference voltage is the sum of first voltage with positive temperature coefficient and second voltage with negative temperature coefficient. The output stage circuit receives working voltage. The compensation circuit receives compensation current, with the negative temperature coefficient, transmitted by the bias circuit and provides compensation voltage with the negative temperature coefficient to the output stage circuit through the bias circuit. The working voltage is the sum of the reference voltage and the compensation voltage. The power amplifier stabilizes the input current of the output stage circuit through the compensation circuit or stabilizes the output current by adjusting the input current into the positive temperature coefficient when the ratio constant between the output current and the input current of the output stage circuit is the negative temperature coefficient.

The invention discloses an energy-saving LED strong light device comprising a base plate, an LED, a light source reflection bowl, a radiator and a translucent lampshade. The energy-saving LED strong light device has the main technical points that connected light source reflection bowl structures are evenly distributed on the convexity of an arc-shaped heat conduction base plate, the inner side of each light source reflection bowl is provided with an LED, the back end part of the LED is connected with the arc-shaped heat conduction base plate, and the edge of the light source reflection bowl structure is convex honeycomb-shaped structure; the radiator is arranged on the concavity of the arc-shaped heat conduction base plate; a power supply driving controller is connected between the LED and the power supply which are connected in series; the power supply driving controller respectively comprises a limited current circuit, a voltage doubling rectifying circuit and a constant current circuit, wherein the voltage doubling rectifying circuit is connected with the output end of the limited current circuit, and the constant current circuit is connected with an output end of the voltage doubling rectifying circuit. As all LEDs in a lamp are connected in series, the constant current circuit provides stable output current for LEDs connected in series, which relatively improves the service life of the LEDs. The invention also has the characteristics of safety, reliability, wide application range and the like.

The invention discloses a complementation-metal-oxide semiconductor constant potential rectifier with rapid stability characteristic, relating to the weak current detection technology of sensors; the complementation-metal-oxide semiconductor constant potential rectifier comprises an operational transconductance amplifier (OTA), a NMOS tube, a switch for rapid charge, and an in-chip and out-chip voltage stabilization and noise filtration capacitor; the output end of the operational transconductance amplifier (OTA) is connected with the grid electrode of the NMOS, the source electrode of the NMOS is connected with the inverted input end of the operational amplifier, so as to form a current conveyer, and the drain electrode of the NMOS is used as the output end of a constant potential rectifier; the switch is connected at the non-inverting input end and the inverted input end of the operational transconductance amplifier in a bridging way, and the control end of the switch is connected to the setting end of the system. In the invention, the stability of the voltage of the working electrode of the sensor can be enhanced, and the circuit with any current can enter in a detection state rapidly, and the constant potential rectifier leads the drain electrode of the NMOS to close to ideal constant flow source output.

The invention discloses a variable gain amplifier, which comprises a current adjustable amplifying circuit and a compensating circuit; wherein the current adjustable amplifying circuit can change the gain according to a control voltage; while the output terminal of the compensating circuit is connected with the output terminal of the current adjustable amplifying circuit, and provides direct compensating current to the adjustable amplifying circuit; the sum of the direct compensating current and the output current of the current adjustable amplifying circuit is equal to the current source current of the current adjustable amplifying circuit. The output current of the variable gain amplifier is relatively stable, which reduces the change of a common mode output level, thereby reducing the influence on the next-stage circuit offset.

The present invention discloses an RF power amplifier which adopts a single chip design without reference voltage, and the RF power amplifier includes a three-terminal current source circuit, a current mirror circuit and an output stage circuit. The three-terminal current source circuit receives a first system voltage and outputs a first current and a second current based on the first system voltage, and a source voltage exists between a first output point of the first current and a second output point of the second current. The current mirror circuit receives the first current and the second current, and generates a bias current based on the first current and the second current. The output stage circuit receives the bias current to work at an operation bias point. The RF power amplifier enables the first system voltage to be between the first voltage and the second voltage through the source voltage of the three-terminal current source circuit, so that the output stage circuit outputs an output current which does not change along with the first system voltage, and which has temperature compensation.

The invention discloses a DFIG system control method based on a repetition sliding mode. A repetition controller is added to a construction sliding mode face, so the system has the capability in controlling any harmonic wave. Through the method, motor electromagnetic torque ripples caused by power grid voltage harmonic waves and harmonic waves of the output current of the system can be eliminated, and prolongation of the life of the blower fan machinery and wind-electricity grid connected harmonic wave standards can be satisfied. According to the method, extraction for each harmonic component is not required, adding extra resonance controllers is not required, control on any subharmonic wave can be realized, and the method makes the system be applicable.

The invention relates to an LED lighting circuit, which is characterized in that a constant flow source which comprises a voltage-regulator tube D3, a fifth current-limiting resistor R5 and a triode Q1 is additionally arranged in the traditional LED lighting circuit. Since the constant flow source is additionally arranged in the traditional LED lighting circuit, and the most notable effect of the constant flow source is stable output current, the output reliability is ensured; even if voltage has fluctuation, the output can not be influenced, and the current output to each branch is constant, and therefore, users can add the number of LED light-emitting diodes according to self needs. The users not only can add the number of the LEDs but also can put the LEDs or change the colors of the diodes at will, and for example, some festive products can be added with colorful light-emitting diodes.

The invention discloses a mobile phone tablet computer having a built-in ultra-thin universal serial bus (USB) device. The mobile phone tablet computer comprises a shell of the mobile phone tablet computer, a mainboard, a supply circuit and a functional circuit. The mobile phone tablet computer is characterized in that the mainboard of the mobile phone tablet computer is connected with an ultra-thin USB charging and/or data-transmission device which can be used for straight cutting of an A type USB mother port, the USB interface standard of the device is USB 2.0 or USB 3.0, and the thickness of the device is usual 2-3 millimeters. The ultra-thin USB device is arranged inside the shell or a groove part of the mobile phone tablet computer at ordinary times and can be pushed out through manual operation, electric operation, flat pushing, rotation, folding and other methods. Compared with the A type USB interface, the built-in ultra-thin USB device of the mobile phone tablet computer is thin, beautiful, and easy to be widely applied, can enable a user to conveniently conduct charging or image-text, music and video transmission by enabling the USB device to be connected with a computer, a laptop, a mobile power and other devices.