681 results about "Bridge circuit" patented technology

The invention relates to the technical field of power distribution automation auxiliary power supply control, and discloses an intelligent power distribution circuit system for a digital ring main unit, which comprises a transient voltage gradient induction bridge circuit, a hardware signal processing circuit, a power switch unit and a controlled energy release unit, according to the system, a transient voltage gradient induction bridge circuit is used for collecting a primary side bus voltage change rate signal, a hardware signal processing circuit carries out derivation operation on an induction signal and compares the induction signal with a voltage gradient threshold value, and a power switch unit is blocked at the moment that the voltage abnormally drops so as to cut off a load current path. According to the invention, a hardware parameter direct mapping mechanism is utilized to realize microsecond transient protection response, and the physical decoupling of protection logic and digital software is realized by balancing bus potential pulse caused by sudden unloading of a load through the inherent dehumidification resistor in the multiplexing cabinet.

The invention relates to the field of tension and pressure sensors, in particular to a tension and pressure sensor with a compensation function, which comprises an elastic body, a strain gauge, a compensation gauge and a wiring terminal, the strain gauge and the compensation gauge are respectively arranged on the surface of the elastic body, the strain gauge, the compensation gauge and the wiring terminal are electrically connected through a plurality of high-temperature-resistant cables to form a bridge circuit, at least the strain gauge and the compensation gauge are respectively limited in the first heat insulation layer and the protection layer, and the first heat insulation layer is located between the elastic body and the protection layer. At least a first heat insulation layer used for protection, heat insulation, pressure resistance and sealing is used for wrapping a strain gauge and a compensating gauge which are packaged by a polyimide film and can resist the high temperature of 260 DEG C, so that the actual temperature of the strain gauge and the compensating gauge has a remarkable temperature difference with the current environment temperature; the actual temperature of the strain gauge and the compensating gauge is obviously lower than the environment temperature, so that the strain gauge and the compensating gauge are respectively in an ideal temperature range, and the force measurement precision of the pull pressure sensor is ensured.

The single-phase bidirectional single-stage isolation matrix converter comprises a pre-stage circuit and a post-stage circuit, and the pre-stage circuit comprises an LC filter on the power grid side, a pre-stage single-phase matrix conversion circuit and an LLC resonance circuit with a high-frequency transformer; the post-stage circuit comprises a post-stage conversion circuit and an output filter capacitor; the front-stage single-phase matrix conversion circuit comprises four bidirectional switch assemblies of a full-bridge structure. Each bidirectional switch assembly comprises two unidirectional controllable MOS tubes which are reversely connected in series, one end of each bidirectional switch assembly is connected to an L line or an N line of a power grid, and the other end of each bidirectional switch assembly is connected to the LLC resonance circuit. The rear-stage conversion circuit comprises a bidirectional MOS (Metal Oxide Semiconductor) tube bridge circuit and three high-frequency transformer secondary windings which are in triangular connection or star connection; and two end points of each secondary winding are respectively connected to the upper MOS tube and the lower MOS tube of the corresponding bridge arm and then are connected to output positive and negative ends. The converter has the advantages of high power density, low current harmonic, high power factor and the like, and is small in size, strong in anti-interference capability, wide in buck-boost range, and safe and reliable in commutation.

The invention discloses a twelve-beam six-dimensional force sensor, and relates to the technical field of force sensing. The sensor effectively solves the problem of coupling interference in six-dimensional force measurement by optimizing the structural design of the elastic body, innovating the bridging mode of the strain gauges and accurately positioning the patches, and improves the measurement precision and stability. The sensor is of a twelve-beam elastomer structure, stress distribution under different loads is analyzed through COMSOL finite element simulation software, and the position of a strain sensitive area is determined; a group bridge circuit is designed through tension and compression strain characteristics of the symmetrical strain beams, and decoupling is achieved from the hardware level; mEMS silicon strain gauges are selected and accurately assembled, so that the measurement error is further reduced. Experimental data show that the crosstalk rate of the sensor under loads of all dimensions is as low as 2%, net output signals are stable, and the sensor can be widely applied to the fields of robots, precision manufacturing, aerospace and the like with high requirements on force measurement precision.

The invention relates to a high-precision temperature detection system based on an alternating-current impedance bridge. The high-precision temperature detection system comprises a double-resistance bridge circuit, a lock-in amplifier and a differential circuit, the double-resistor bridge circuit comprises a resistive temperature sensor and a standard resistor which are connected in series, and the phase-locked amplifier is a digital phase-locked amplifier realized based on an FPGA (Field Programmable Gate Array). Wherein the initial potential of a first voltage measurement end arranged at the midpoint of the double-resistor bridge circuit is zero by adjusting the two excitation signals which are loaded to the double-resistor bridge circuit and have the same frequency and opposite phases before temperature measurement; in the temperature measuring process, the lock-in amplifier detects the potential of the first voltage measuring end and the voltage at the two ends of the standard resistor through the differential circuit, then the resistance value of the resistance-type temperature sensor is calculated by combining the resistance value of the standard resistor, and then the temperature of the resistance-type temperature sensor is reduced. According to the invention, the anti-interference capability can be improved, and the measurement precision of 0.1 mK level can be reached near 273K.

The invention discloses a half-bridge ZVS Buck-Boost converter and a control method thereof, and belongs to the technical field of power converters, the half-bridge ZVS Buck-Boost converter comprises a primary side conversion module, a voltage transformation module and a secondary side conversion module, and the primary side conversion module, the voltage transformation module and the secondary side conversion module are connected in sequence; the primary side conversion module comprises a first bridge arm, a second bridge arm, a first inductor and a bidirectional switch, the first bridge arm and the second bridge arm are connected in parallel, a bridge arm midpoint of the first bridge arm is connected with a first end of the first inductor, a second end of the first inductor is connected with a first end of the voltage transformation module, and a second end of the voltage transformation module is connected with a second end of the voltage transformation module. The second end of the voltage transformation module is connected with the bridge arm midpoint of the second bridge arm, the bridge arm midpoint of the first bridge arm is connected with the first end of the bidirectional switch, and the second end of the bidirectional switch is connected with the bridge arm midpoint of the second bridge arm. According to the invention, zero-voltage switching-on of the half-bridge circuit switching tube in a full-input, full-output and full-load range under a constant switching frequency can be realized.

A laptop computer including a first casing, a first sub-circuit board, an input module, a second casing, a motherboard, and a bridge circuit board is provided. The first sub-circuit board is disposed at the first casing. The input module is disposed at the first casing and electrically connected to the first sub-circuit board. The motherboard is disposed at the second casing. The first casing and the second casing are assembled together, such that the first sub-circuit board, the bridge circuit board, and the motherboard are partially overlapped, and the first sub-circuit board is electrically connected to the motherboard via the bridge circuit board.

The invention discloses a control device of a magnetic suspension bearing driver, a magnetic suspension bearing and a control method of the magnetic suspension bearing driver, and the device comprises a control unit which outputs a first group of control signals to an auxiliary resonance unit; the auxiliary resonance unit is arranged on the input side of the bridge circuit and provides bus voltage for the input side of the bridge circuit under the control of the first group of control signals output by the control unit based on preset power supply voltage; the control unit is also used for outputting a second group of control signals to the bridge circuit; and the bridge circuit is used for realizing soft switching control under the control of the second group of control signals output by the control unit based on the bus voltage provided by the auxiliary resonance unit. According to the scheme, the auxiliary resonance circuit is additionally arranged in front of the bridge circuit, and the equivalent capacitor module is additionally arranged in the bridge circuit, so that the switching power amplifier in the bridge circuit realizes zero-voltage starting, the switching peak current can be reduced, the power loss is reduced, and the service life of the switching power amplifier is prolonged.

The invention relates to the technical field of power electronics, and discloses an alternating-current static switch topology with a buffering function and a design method of the alternating-current static switch topology. The alternating-current static switch topology comprises a bridge circuit and a buffer circuit, the buffer circuit comprises a first resistor, a first capacitor and a piezoresistor, the first resistor and the first capacitor are connected in series and then connected to the two ends of the bridge circuit in parallel, and the piezoresistor is connected to the two ends of the bridge circuit in parallel. According to the alternating-current static switch topology, the IGBT transistors of the bridge circuit achieve circuit mu s-level rapid opening and closing switching, and opening and closing rapidity is guaranteed; when the IGBT transistor of the bridge circuit is switched off, the piezoresistor of the buffer circuit and the RC circuit absorb the peak voltage of the IGBT transistor when the large current is switched off, so that the IGBT transistor is prevented from generating relatively high voltage stress due to system inductive reactance, the safe and stable work of the IGBT transistor in the bridge circuit is ensured, and the reliability and the stability of the application of the alternating current static switch are improved.

A power supply system with a large number of battery modules, wherein each battery module has a first electrical connection and a second electrical connection, via which the battery modules are connected in series in an interconnection branch of the power supply system. Each battery module also has an accumulator which can be connected via a bridge circuit of the battery module to the first electrical connection and the second electrical connection, and to a charging path via which the power supply system can be charged, and to a discharging path via which the power supply system can deliver electrical power to a connected consumer. The power supply system has a switching component to which the charging path, the discharging path and the interconnection branch are connected, and wherein the switching component can connect the charging path and / or the discharging path electrically conductively to the interconnection branch.

The utility model relates to the technical field of high-voltage cascade energy storage systems, and discloses a valve hall type high-voltage cascade energy storage system based on nested power modules, which comprises three phases of chain type energy storage bridge arms respectively connected with three phase lines of a power grid, and each phase of chain type energy storage bridge arm comprises a plurality of cascaded nested power modules. Each nested power module comprises a plurality of direct-current energy storage units and an H-bridge circuit, the plurality of direct-current energy storage units are connected in parallel and then connected with the direct-current side of the H-bridge circuit, and the alternating-current side of the H-bridge circuit is connected with an alternating-current switch; the DC energy storage unit comprises a battery cluster and a DCDC converter connected with the battery cluster in parallel, the DCDC converter comprises a first capacitor, a second capacitor and a power conversion unit, and the power conversion unit comprises three full-control semiconductor devices and an inductor. According to the utility model, each battery cluster is accurately controlled through the DCDC converter in the embedded power module, so that the reliability of the valve hall type high-voltage cascade energy storage system is improved.

The application discloses a DC line single-end fault ranging method and system with self-calibration capability, and belongs to the technical field of DC line fault positioning. The technical problem to be solved is that the anti-interference capability of a DC fault ranging technology is weak, parameter drift cannot be calibrated, double-end synchronization is required, and engineering implementation is complex. Technical scheme points are as follows: an excitation signal is injected into a fault line through an H-bridge circuit unit, an H-bridge output voltage and a line port voltage after an external calibration inductor are synchronously collected, and a line fault loop current zero-crossing moment is detected; at the zero-crossing moment, two groups of voltage equations are used to solve an external calibration inductor calculation value in real time, the inductor calculation value is compared with a nominal value to obtain an inductor correction coefficient, online self-calibration of the line inductor is realized; and based on the calibrated line inductor, fault discrimination and distance calculation are completed in combination with a relationship between a port voltage and a current slope.

A power transfer device and system include an AC delivery path, a DC delivery path, and a circuit to combine the power from the AC delivery path and the DC delivery path. The AC delivery path includes a source bridge circuit that couples AC source to a source DC link. The source bridge has cross-connected switches to convert an AC current from the AC source to a pseudo DC (direct current) current, and the source DC link transfer the energy as a DC current. The DC delivery path includes a battery, a battery interconnection circuit, and a battery DC link to transfer energy from the battery as a DC current. Both the AC delivery path and the DC delivery path couple to a consumer bridge circuit having cross-connected switches to convert the DC current to an AC current for a microgrid.

In an aspect of the disclosure, an operation method, for balancing voltage of capacitors of a bridge circuit of a multi-level LLC resonant converter, includes: measuring voltages of the capacitors of the bridge circuit, an output voltage and an output current of an output load the multi-level LLC resonant converter, and an input voltage of the bridge circuit; selecting a voltage-level zone of a required output voltage of the bridge circuit according to the output voltage of the output load, and the input voltage of the bridge circuit; selecting a circuit mode, with a highest value of the required output voltage; and outputting PWM signals corresponding to the circuit mode, with a switching frequency, to switches of the plurality of capacitor-switch modules.

In the DAB converter, the control circuit (13) controls in a manner including a first period in which the first DC portion (E1, Ca) is conducted with the primary winding (n1) of the isolation transformer (TR1), and a second period in which both ends of the primary winding (n1) of the isolation transformer (TR1) are short-circuited within the first bridge circuit (11), in the case of step-down transmission of electric power from the first DC portion (E1, Ca) to the second DC portion (E2, Cb). The control circuit (13) generates: a first mode in which the fourth switching element (Q4) is off, and the first period is switched to the second period; a second mode in which the second switching element (Q2) is off, and the first period is switched to the second period; a third mode in which the first switching element (Q1) is off, and the first period is switched to the second period; and a fourth mode in which the third switching element (Q3) is off, and the first period is switched to the second period.

A common-source cascode switching system and its operation method, as well as a half-bridge circuit, are disclosed. The common-source cascode switching system includes a JFET and a MOSFET coupled in series between the drain and source terminals, and a driving circuit. The driving circuit includes: a JFET driver that receives an input signal and outputs a JFET drive signal to a capacitor coupled in series with the gate of the JFET; a switch coupled between the gate and source terminals of the JFET and configured to respond to the input signal; and a comparator for comparing the JFET gate voltage with a threshold. The driving circuit also includes a MOSFET driver circuit to drive the MOSFET in a MOSFET on state during an input signal on state, and to drive the MOSFET in either a MOSFET off state or a MOSFET on state during an input signal off state in response to a comparison signal from the comparator.

A system and method for reducing common mode (CM) conducted electromagnetic interference (EMI) noise of a full bridge (FB) resonant converter is presented. The FB resonant converter comprises a bridge circuit, a transformer, a resonant cavity and a rectifier. The transformer has a primary winding and a secondary winding which are magnetically coupled, the primary winding being divided into a first primary winding segment and a second primary winding segment, respectively having winding turns P1 and P2. The resonant cavity is composed of a capacitor and an inductor and is electrically connected between the first and second primary winding segments. The secondary winding is electrically connected with the rectifier. The bridge circuit includes two or more switches with duty cycle control connected to the primary winding in series with the first and second primary winding segments.

The application relates to the technical field of hydraulic control, in particular to a jitter prevention system applied to a load-sensitive proportional multi-way valve, which controls the flow supply of a hydraulic system through the opening change of a pressure compensator, the pressure compensator is driven by an initial pressure P1 collected at a load-sensitive signal LS collection point, the initial pressure P1 presents irregular sawtooth fluctuation; the initial pressure P1 is subjected to filtering and voltage stabilizing treatment through an S-shaped damping bridge circuit, the S-shaped damping bridge circuit converts the fluctuating initial pressure P1 into stable target pressure P4, so as to drive the pressure compensator to smoothly act, and realize the continuous and stable supply of system flow.

The utility model provides a wire cup capable of being electrically controlled to brake and a fishing reel. The wire cup comprises a cylindrical cup body, a stator part, a rotor part, an electric control unit, a single-phase rectifier bridge circuit and a switching device. The stator part and the rotor part are arranged in the cup body, the stator part comprises a first induction coil and a second induction coil, the first end of the first induction coil is connected with the first end of the second induction coil, and the rotor part can coaxially rotate relative to the stator part and comprises a plurality of magnets which are arranged on the inner wall of the cup body at intervals in the circumferential direction; the polarities of the adjacent magnets are opposite; two alternating-current ends of the single-phase rectifier bridge circuit are respectively connected with the second end of the first induction coil and the second end of the second induction coil, and two direct-current ends of the single-phase rectifier bridge circuit are connected with a power supply end of the electric control unit; the enable end of the switching device is connected with the brake signal output end of the electric control unit, and the brake current path is conducted when a brake signal sent by the electric control unit is received.

The invention relates to a power converter control method, a power converter and a chip, the power converter comprises an alternating current side half-bridge circuit and a controller, the provided power converter control method is used in the controller, and the method comprises the following steps: when the alternating current side half-bridge circuit satisfies a zero-crossing switching condition, starting the controller; and switching the control mode of the AC side half-bridge circuit from the first mode to the second mode. Wherein the second mode comprises that all the switching devices located in the same bridge arm circuit are switched on according to a preset time sequence or switched off according to the preset time sequence, the corresponding switching devices in different bridge arm circuits are switched on in a complementary mode, and after the switching device which is switched on in a pilot mode in one bridge arm circuit is switched on for a preset time length, the switching device which is switched off later in the other bridge arm circuit is switched off. By adopting the method, the control reliability of the power converter can be improved.

The invention discloses a current converter, a control method and a related product. The converter comprises a three-phase full-bridge circuit and a controller. A direct current first end of the three-phase full-bridge circuit is used for connecting a direct current positive electrode, a direct current second end of the three-phase full-bridge circuit is used for connecting a direct current negative electrode, and a three-phase alternating current end of the three-phase full-bridge circuit is used for connecting a converter transformer; wherein the upper bridge arm and the lower bridge arm of each phase in the three-phase full-bridge circuit respectively comprise a converter valve; the controller is configured to obtain a turn-off interval of a target converter valve, the target converter valve is allowed to be turned off actively in the turn-off interval, and the target converter valve comprises a converter valve in any upper bridge arm or any lower bridge arm; and under the condition that the converter is abnormal, controlling the target converter valve to prohibit active turn-off in the turn-off interval. In the embodiment of the invention, under the condition that the converter is abnormal, the target converter valve is controlled to be prohibited from being turned off actively in the turn-off interval corresponding to the target converter valve, so that the internal turn-off stress of the converter valve is reduced, and the operation safety of the converter valve is improved.

The invention relates to a photovoltaic system, a micro inverter and a control method thereof. The micro inverter comprises a primary side capacitor, wherein the input end of the primary side capacitor is used for being connected with a renewable energy source conversion device; a primary side H-bridge circuit; a transformer; a bidirectional switch bridge arm; the controller is used for acquiring an input signal of the primary side H-bridge circuit, a specified control signal and a grid-connected state of the micro inverter and determining a connection state of the micro inverter and the renewable energy source conversion device according to the input signal and the specified control signal of the primary side H-bridge circuit and the grid-connected state of the micro inverter; the specified control signal is a control signal loaded to the primary side H-bridge circuit and the bidirectional switch bridge arm. In the micro inverter, the controller determines the connection state of the micro inverter and the renewable energy source conversion device according to the input signal of the primary side H-bridge circuit, the specified control signal and the grid-connected state of the micro inverter, so that the risk of misjudgment of access detection is effectively reduced.

An integrated circuit (100A) includes an H-bridge circuit (102) having a first output node (OUT1) for coupling to the high-side terminal of an inductor (103) and a second output node (OUT2) for coupling to the low-side terminal of the inductor. A current-sensing FET (SNS-DRV) is coupled between a current source (110) and a lower supply voltage to provide a reference current (Itrip), including a peak current limit at the sensing node. A current-sensing comparator (104) has a first input coupled to the sensing node, a second input coupled to the second output node, and an output (113) coupled to send an output signal to a driver control circuit. A FET linearity detection circuit (112) is coupled to receive the gate voltage (LS2) of an active low-side power FET (Mls2) and has an output (CMP EN) coupled to enable the current-sensing comparator when the active low-side power FET operates in the linear region.

The precision capacitance micrometer system comprises a modulation signal source, a sensitive probe, a differential transformer bridge circuit, a signal amplification link, a multiplier and a low-pass filter circuit which are electrically connected in sequence, a double-limit comparator is arranged between the signal amplification link and the multiplier; the input end of the double-limit comparator is connected with the output end of the signal amplification link, the output end of the double-limit comparator is connected to one input end of the multiplier, and the double-limit comparator is used for shaping the amplified modulation signal and taking the shaped signal as the demodulation input signal. The invention also provides a precise capacitance micrometer method. The precise capacitance micrometer system provided by the embodiment of the invention ensures that the system output is insensitive to phase difference fluctuation within a certain demodulation phase difference range, and finally realizes high-precision measurement of micro displacement. All the modules complete full-link conversion from physical quantity to measurable voltage signals through step-by-step signal transmission and function complementation.

A method and system for monitoring an insulation resistance (IR) of an electric machine, the system including a bridge circuit arrangement. A voltage on the bridge circuit arrangement is detected. The IR is calculated as a resistance in the bridge circuit arrangement associated with the detected voltage.

The invention relates to an automation component (1), comprising a printed circuit board (LP) with electrical components (B1,…,B4) for performing automation tasks, a first supply voltage terminal (IN_24V) and a second supply voltage terminal (S_GND) configured for connection of a supply voltage (24V), wherein a reverse polarity protection circuit (VSS) is arranged between the first supply voltage terminal (IN_24V) and a feed point (S_1P24V) of the supply voltage (24V) for the components (B1,…,B4), wherein a bridging circuit (US) is integrated into the reverse polarity protection circuit (VSS), and is configured to maintain the energy flow for the electrical components (B1,..,B4) in the event of a voltage dip (SE) in the supply voltage (24V).

An uninterruptible power supply device (10) comprises: a converter (12) that converts AC power supplied from an AC power supply (1) into DC power and supplies the DC power to a DC bus (14); an inverter (18) that converts DC power received from the DC bus (14) into AC power and supplies the AC power to an AC transmission line (4); and a power storage device (3). The converter (12) includes a plurality of cascaded first converter cells. The inverter (18) includes a plurality of cascaded second converter cells. The power storage device (3) includes a plurality of power storage cells (3a) provided respectively corresponding to the plurality of first converter cells. Each of the plurality of first converter cells includes: a first input / output terminal and a second input / output terminal; a first bridge circuit including a plurality of semiconductor switching elements; a first capacitor connected to the first and second input / output terminals via the first bridge circuit; and a charge / discharge circuit. The charge / discharge circuit exchanges DC power between the first capacitor and the corresponding power storage cell.

The present disclosure relates to a monitoring module and a surge protection system for monitoring a surge protection module. The invention relates to a monitoring module (16) for monitoring a surge protection module (21). The monitoring module (16) has a first connection (18) and a second connection (20) for the surge protection module (21). The monitoring module (16) has an overload protection (22) which is connected to the first connection (18) via a line (26) and is adapted to be connected in series with the surge protection module (21) via the first connection (18). The monitoring module (16) comprises a bridge circuit (28) for voltage detection. The monitoring module (16) has an evaluation unit (30) which is connected to the line (26) via a tapping (29) of the bridge circuit (28) to detect and evaluate a voltage drop across the overload protection (22) and / or a voltage drop between the first connection (18) and the second connection (20). Furthermore, a surge protection system (10) is described.

The present specification relates to the technical field of power electronics, and particularly relates to a multi-element heterogeneous hydrogen production power supply and a control method. The power supply comprises a main branch and an auxiliary branch. The main branch comprises a first rectifier circuit and a Buck converter. An input end of the first rectifier circuit is connected with a first output winding of a transformer, an output end of the first rectifier circuit is connected with an input end of the Buck converter, and an output end of the Buck converter is connected with a first end of a DC bus. The main branch is used for providing steady-state power. The first rectifier circuit is an uncontrolled rectifier circuit. The auxiliary branch comprises a second rectifier circuit and a full-bridge circuit. An input end of the second rectifier circuit is connected with a second output winding of the transformer, an output end of the second rectifier circuit is connected with an input end of the full-bridge circuit, and an output end of the full-bridge circuit is connected with the first end of the DC bus. The auxiliary branch is used for transmitting fluctuating power or AC excitation. The embodiments of the present specification can balance between steady-state high efficiency and dynamic fast response.

This invention provides an inverter load simulation device capable of producing a sinusoidal waveform output with suppressed distortion even at high switching frequencies. [Solution] The inverter load simulation device 1 includes switching circuits 13, 23, 33 which are bridge circuits composed of a plurality of switching elements SW1 to SW4, a drive control unit 51 which controls the driving of the plurality of switching elements SW1 to SW4 in the switching circuit 13, a filter 40 which converts the voltage output from the switching circuit 13 into a sinusoidal voltage, isolated DC / DC 11, 21, 31 which supply a DC voltage to the switching circuits 13, 23, 33 and which can change the DC voltage, and a DC voltage adjustment unit 52 which changes the DC voltage output by the isolated DC / DC 11, 21, 31 according to the voltage Vo output to the inverter P under test.