31 results about "Bipolar voltage" patented technology

The invention belongs to the technical field of semiconductor processing, and particularly relates to an electrostatic chuck power supply with independent bias voltage, adsorption equipment and a control method.The power supply comprises a direct-current high-voltage module and a first power supply polarity switching module which are connected in sequence, and the first power supply polarity switching module outputs bipolar voltage used for adsorbing an electrostatic chuck; the system further comprises a control module, a bias voltage module and a second power supply polarity switching module. The output end of the second power supply polarity switching module is electrically connected with the direct-current high-voltage module. The bias voltage module obtains a direct current input voltage and outputs a bias voltage to the second power supply polarity switching module, the second power supply polarity switching module switches the polarity of the bias voltage and outputs the polarity to the direct current high voltage module under the control of the control module, and meanwhile, the bias voltage can be independently output as a voltage source. The bias voltage can meet the dynamic adjustment requirement in the wafer adsorption process, and is suitable for application scenes where the bias voltage needs to be independently used.

An ultrasonic imaging system has a bias-switchable, ultrasonic transducer array and a bipolar voltage source. The array has a dielectric layer having a top surface and a bottom surface; top and bottom electrode strips in electrical contact with the top and bottom surface of the dielectric layer, the bottom electrode strips being oriented at a non-zero angle relative to the top electrode strips. There is an acoustic matching layer or multiplicity of matching layers on the front-side of the array and a leakage-current mitigation layer. The bipolar voltage source is connected to each of the top and bottom electrode strips to induce a polarization in the dielectric layer, the bipolar voltage source being capable of switching between a high voltage state and a low voltage state. A controller controls the bipolar voltage source, and pulsing to and receiving signals from the top and bottom electrode strips.

The utility model relates to the technical field of power supply circuits, in particular to a bipolar output circuit for a photoresist constant-temperature power supply, which comprises a bipolar inverter circuit, a driving control circuit and an auxiliary power supply circuit. The isolation driving circuit uses a simple optical coupler device, a special digital driver or a high-speed driving optical coupler is not needed, an upper tube driving auxiliary power supply directly couples to generate two paths of driving power supplies through a mode of adding an auxiliary winding on an inductor of a conventional PWM converter, an additional independent auxiliary power supply is not needed, a bipolar voltage output function is realized, and the voltage output is realized. The circuit has the advantages of no physical contact, long service life, simple circuit and low cost.

A method includes, based on respective signals acquired by a plurality of electrodes on an anatomical surface of a heart, computing respective local activation times (LATs) at respective locations of the electrodes. The method further includes, based on the LATs, computing respective directions of electrical propagation at the locations. The method further includes selecting pairs of adjacent ones of the electrodes such that, for each of the pairs, a vector joining the pair is aligned, to within a predefined threshold degree of alignment, with the direction of electrical propagation at the location of one of the electrodes belonging to the pair. The method further includes associating respective bipolar voltages measured by the pairs of electrodes with a digital model of the anatomical surface. Other examples are also described.

A method includes, based on respective signals acquired by a plurality of electrodes on an anatomical surface of a heart, computing respective local activation times (LATs) at respective locations of the electrodes. The method further includes, based on the LATs, computing respective directions of electrical propagation at the locations. The method further includes selecting pairs of adjacent ones of the electrodes such that, for each of the pairs, a vector joining the pair is aligned, to within a predefined threshold degree of alignment, with the direction of electrical propagation at the location of one of the electrodes belonging to the pair. The method further includes associating respective bipolar voltages measured by the pairs of electrodes with a digital model of the anatomical surface. Other examples are also described.

The invention belongs to the technical field of diaphragm function monitoring, and discloses a wearable ultrasonic patch-based diaphragm function monitoring system, which comprises two ultrasonic patches with different frequencies and a signal transmitting and receiving system, each ultrasonic patch comprises a waterproof silica gel sealing layer, a matching layer, a piezoelectric material layer and a backing layer, and the piezoelectric material layer is used for transmitting and receiving ultrasonic echo signals; the backing layer is used for absorbing ultrasonic signals, and the matching layer is used for reducing interface reflection of the ultrasonic signals; the transmitting module is used for applying bipolar voltage pulses; the processing module is used for processing and analyzing the two ultrasonic echo signals to obtain diaphragm displacement, diaphragm thickness and diaphragm thickening fraction. The two body surface ultrasonic patches and the signal transmitting and receiving system are utilized, the diaphragm displacement, the diaphragm thickness and the thickening fraction can be continuously and simultaneously monitored for a long time in a non-invasive mode, noninvasiveness and comfort are achieved, the monitored diaphragm parameters are more comprehensive, and the burden of medical staff is relieved.

The invention discloses a bipolar voltage-time converter based on phase inverter threshold detection. The bipolar voltage-time converter is characterized in that a differential sampling circuit is connected with a sign bit comparator and a bipolar voltage-time conversion circuit; the sign bit comparator is used for receiving the differential sampling voltage output by the differential sampling circuit and judging the polarity of an input differential analog signal, and is connected with the bipolar voltage-time conversion circuit to output a sign bit signal and a polarity control signal; the bipolar voltage-time conversion circuit is used for charging or discharging the differential sampling voltage under the control of the polarity control signal to generate two paths of voltage ramp signals with opposite polarities, and is connected with the common-mode feedback circuit and the inverter threshold detection circuit; the common-mode feedback circuit is used for detecting a common-mode level of the differential sampling voltage or two paths of voltage ramp signals; the threshold voltage of the inverter threshold detection circuit is configured to be a predetermined common-mode level, and is used for detecting a crossover event of the two voltage ramp signals at the predetermined common-mode level and outputting a threshold detection signal.

The application discloses an isolation type inter-electrode voltage self-balancing circuit based on an L type current input type, which comprises the following: 1 input voltage source u in , 2 field effect tubes S1 and S2, 2 inductors L1 and L2, 1 transformer T, 4 switching diodes D 11 , D 12 , D 21 , D 22 , 4 capacitors C1, C2, C P , C N , and bipolar loads R P , R N . The circuit is based on an L type current input type circuit and adopts staggered control, so that the currents flowing through the input inductors L1 and L2 are staggered and complementary, and the input current ripple is effectively reduced. The problem of inter-electrode voltage deviation caused by unbalanced loads is solved through a bipolar voltage doubling unit, the inter-electrode voltage automatic balancing effect is realized, the voltage unbalance degree detection is not relied on, the complex sampling and control algorithm is not needed, the design difficulty is reduced, and the application occasion requiring high gain, low current ripple and bipolar power supply is suitable for.

This invention discloses a bidirectional bipolar input / output DC-DC converter topology, which is an asymmetric structure centered on a high-frequency transformer T1 with a center tap. It includes a first circuit unit, the high-frequency transformer T1, and a second circuit unit connected in sequence. The first circuit unit employs a half-bridge or full-bridge structure, and the second circuit unit also employs a half-bridge or full-bridge structure. At least one of the first and second circuit units uses a bidirectional switching structure with two switches connected in reverse series, enabling mutual conversion between the bipolar voltages of the first and second circuit units, thus multiplying the voltage variation range on the output side. This invention improves upon traditional bipolar DC-DC converters, achieving stable and adjustable voltage gain by changing the switching frequency while realizing high-frequency, high-efficiency bipolar DC-DC conversion, significantly improving the converter's wide-range voltage supply capability.

A method includes, based on respective signals acquired by a plurality of electrodes on an anatomical surface of a heart, computing respective local activation times (LATs) at respective locations of the electrodes. The method further includes, based on the LATs, computing respective directions of electrical propagation at the locations. The method further includes selecting pairs of adjacent ones of the electrodes such that, for each of the pairs, a vector joining the pair is aligned, to within a predefined threshold degree of alignment, with the direction of electrical propagation at the location of one of the electrodes belonging to the pair. The method further includes associating respective bipolar voltages measured by the pairs of electrodes with a digital model of the anatomical surface. Other examples are also described.

The invention provides an overvoltage protection device and an overvoltage protection method, which can utilize a processor to detect the stoping voltage of a voltage acquisition circuit, and if the stoping voltage exceeds a first voltage limit range, a first cut-off instruction is sent to a first overvoltage protection circuit to cut off the transmission of bipolar voltage by the first overvoltage protection circuit; moreover, in order to improve the accuracy of the overvoltage protection of the bipolar voltage, the bipolar voltage transmitted by the first overvoltage protection circuit is detected by using the second overvoltage protection circuit, and if the bipolar voltage exceeds a second voltage limiting range, the transmission of the bipolar voltage by the second overvoltage protection circuit is cut off. Therefore, the overlarge bipolar voltage is prevented from being transmitted to the load through the voltage acquisition circuit, and the load can be ensured to always work in a normal voltage range through dual overvoltage protection of the first overvoltage protection circuit and the second overvoltage protection circuit.

The invention relates to the technical field of electronic measurement, in particular to a low-common-mode bipolar edge-control constant-current excitation low-value resistance testing method. The low-common-mode bipolar edge-control constant-current excitation low-value resistor testing device comprises a bipolar edge-control voltage module, a constant-current control module, a low-common-mode excitation module, a tested resistor and a sampling end module, the method comprises the steps that S1, a DAC voltage source of a bipolar edge control voltage module provides a bipolar voltage source Vdac with an edge control function; s2, the output voltage Vref of the bipolar edge control voltage module is connected with a constant current control module; s3, the excitation output low end of the constant current control module is connected with a low common mode excitation module; s4, the excitation output low end and the excitation output high end of the low common mode excitation module are connected with the tested resistor through a test cable; and S5, the induction high end and the induction low end of the test cable are connected with a sampling end module. According to the invention, the edge control technology and the constant current excitation technology are combined, and low-common-mode and high-precision low-value resistance measurement is realized.

The invention discloses an unbalanced power and bipolar voltage cooperative control method for a Vienna rectifier without an electrolytic capacitor, and belongs to the technical field of Vienna rectifier control. The invention aims to solve the problem of system control instability caused by violent bipolar voltage oscillation when a Vienna rectifier is connected with a load with a relatively large power level difference at a direct current side. Comprising the following steps: comparing an unbalanced power boundary with a real-time power unbalance degree, and if the unbalanced power boundary is smaller than the real-time power unbalance degree, selecting a bipolar voltage difference control mode; otherwise, selecting a bipolar voltage balance control mode; in the balance control mode, selecting the optimal clamping mode of intermittent pulse width modulation according to the comparison result of the midpoint voltage at the adjacent next moment and the voltage hysteresis boundary; and under a bipolar voltage difference control mode, calculating an optimal voltage unbalance degree, performing vector synthesis on two adjacent vectors in a voltage vector non-synthesis region, and obtaining a modulation wave after track optimization by calculating a duty ratio. According to the invention, grid-side current harmonics can be reduced.

The embodiment of the invention discloses a medium-voltage power supply system and a solid-state transformer system, and belongs to the technical field of power conversion. The medium-voltage power supply system comprises at least one set of solid-state transformer system; the solid-state transformer system comprises a plurality of bridge arm modules, each bridge arm module comprises a plurality of solid-state transformer modules, and the solid-state transformer modules output unipolar voltage; the input ends of the plurality of bridge arm modules are connected with a three-phase power grid by adopting a preset three-phase topological connection mode; wherein the voltage value of the three-phase power grid is greater than or equal to a preset voltage threshold value; in the at least one solid-state transformer system, the output end anode of at least one bridge arm module is connected with the DC bus anode, the output end cathode is connected with the DC bus midpoint, the output end anode of at least one bridge arm module is connected with the DC bus midpoint, and the output end cathode is connected with the DC bus cathode; bipolar voltage can be output on a direct current bus, bipolar output is achieved, and the requirement for bipolar output of part of loads is met.

A polarity-adjustable high-voltage pulse generator includes: a control signal generation module, an opto-isolation drive module, a solid-state switch drive module, a Marx circuit low-voltage generation module, a relay polarity switching module, a pulse transformer boost unit module, and a load. This invention proposes a polarity-adjustable high-voltage pulse source based on a Marx-type circuit combined with a pulse transformer. Only a small number of Marx circuit stages are needed as the front-end low-voltage output unit, and high-voltage output is achieved by using a pulse transformer to boost the voltage. Simultaneously, the primary winding of the low-voltage output unit is connected to the Marx circuit using a high-frequency relay. By controlling the relay switching, the polarity of the high-voltage pulse generator is adjustable. The high-voltage pulse generator proposed in this invention can achieve high-amplitude single positive polarity, single negative polarity, and bipolar voltage outputs.

An isolated bipolar output self-voltage balancing DC-DC converter, the converter comprising a forward converter, a bipolar voltage balancing unit; the forward converter comprises a DC input source u in , a power switch S1, a reset inductor L p1 , a transformer T, a reset diode D p1 , a rectifier diode D1, a freewheeling diode D2, an inductor L 1, an output capacitor C 1; the bipolar voltage balancing unit comprises a rectifier diode D3, a freewheeling diode D4, an inductor L 2, an inductor L 3, an output capacitor C 2, a voltage balancing capacitor C p The application can effectively reduce the voltage imbalance problem caused by cross regulation ratio of the traditional forward converter in bipolar output, reduce voltage deviation, and the circuit control is simple, the automatic voltage balancing of the bipolar output is realized through the bipolar voltage balancing unit, without complex sampling and control algorithm, the control system design and implementation difficulty is low, and the application is suitable for the occasions requiring bipolar voltage power supply.

A quantum computing system comprises a qubit and a driving circuit for providing a stream of driving pulses to said qubit. The driving circuit is configured to produce said driving pulses as bipolar voltage pulses so that a driving voltage in each driving pulse deviates from zero to either positive or negative direction. The stream of driving pulses contains pulses of both polarities in a predetermined sequence.

The embodiment of the application discloses an H-bridge circuit control method, electronic equipment and switching power supply. The control method is for an H-bridge circuit comprising a first switch tube group and a second switch tube group, and comprises: setting a target state and a target voltage of the H-bridge circuit; obtaining a duty cycle according to an output voltage and the target voltage; PWM modulating the first switch tube group according to the duty cycle, the target state and the target voltage; and controlling the second switch tube group to keep a corresponding conduction or cut-off state according to the target state and the target voltage, so that the charge and discharge state of the H-bridge circuit reaches the target state, and the output voltage reaches the target voltage. In the above manner, the embodiment of the application can realize flexible switching of BUCK mode and BOOST mode under the same H-bridge circuit topology, overcome the defect of single polarity output, realize random combination of positive and negative bipolar voltage output and charge and discharge state, and expand the application scene and use scheme of the H-bridge circuit.

The invention relates to the technical field of active magnetic compensation current driving, in particular to an active magnetic compensation bipolar current source driving system which comprises a preceding-stage filtering and protection module, a DC-DC switching power supply module, an LDO voltage stabilization module, an analog compensation network module, a bipolar output voltage-controlled current source module, a microcontroller module, a current setting module and a digital acquisition module. The primary power supply is used as the input of the DC-DC switching power supply module after being subjected to pre-filtering and protection, and the multi-path LDO voltage stabilizing module is used for stabilizing the voltage of the output of the DC-DC power supply, reducing the ripple noise of a switch and supplying power to the bipolar voltage-controlled current source module. The microcontroller module communicates with the current setting and data acquisition module in an SP I mode, and real-time current setting and reading are achieved. The active magnetic compensation electric control system is low in cost and noise, stable bipolar current output can be provided for the magnetic compensation coil, and the active magnetic compensation electric control system has the advantages of being low in noise, high in stability, rapid in response and the like.

The invention provides an electrowetting electronic paper bipolar voltage gray level modulation driving method based on dot inversion. An active matrix addressing electrowetting electronic paper display screen is adopted. Dividing one-frame display time of a display screen into two subframes, and respectively allocating a first gray scale and a second gray scale for the two subframes based on parity of N, so that the gray scales of the two subframes are adaptive to a target display gray scale; counting the scanned pixels, and when a trigger condition is met, updating the polarity control signal A so as to realize dot inversion chessboard type polarity distribution; determining the polarity of the source voltage applied to the current pixel unit relative to the common voltage according to the current state of the polarity control signal A; through voltage output combination of the two subframes, a gray level adaptive to the driving chip is formed; and when the counting result is equal to the total pixel number of the display screen, judging that the scanning of the current frame is finished, entering the next frame, and re-executing the sub-frame gray level distribution, polarity control, gray level combination and scanning judgment steps.

This invention provides a high-voltage unipolar and bipolar voltage-current modulation communication detonator electronic circuit, belonging to the field of electronic detonators. It solves the problem that existing low-voltage powered electronic detonator chips cannot drive high-voltage plasma exciters. The circuit includes a high-voltage unipolar voltage regulator circuit, a unipolar / bipolar voltage modulation communication detonator electronic chip driver circuit, and a high-voltage plasma exciter trigger circuit. The input terminals of the high-voltage unipolar voltage regulator circuit are connected to the detonator pin terminals LINE-A and LINE-B, respectively. The output terminal of the high-voltage unipolar voltage regulator circuit outputs high-voltage electricity to the high-voltage plasma exciter trigger circuit. The other output terminal of the high-voltage bridge is connected to the unipolar voltage modulation communication detonator electronic chip driver circuit. The unipolar / bipolar voltage modulation communication detonator electronic chip driver circuit outputs a driving signal to the high-voltage plasma exciter trigger circuit. This invention is applied to high-voltage plasma exciter electronic detonators without detonating explosives.

The application discloses a bipolar three-output isolated power supply integrated circuit, which comprises a transmitting end and a receiving end; the transmitting end and the receiving end are coupled through a transformer; the transmitting end comprises a power amplifier and a transmitting end control logic circuit; the receiving end comprises a bipolar output rectifier and an adaptive mode selection and logic circuit; through integrated design, the bipolar three-output isolated power supply integrated circuit realizes electrical isolation of the transmitting end and the receiving end, unification of the bipolar voltage output rectifier and high power density through transformer coupling, and aims to solve core problems of a traditional scheme, such as large size, low integration, poor bipolar power supply stability, insufficient anti-interference capability and the like, realizes bipolar three-way output voltage in a single rectifier, additionally generates a control logic power supply in addition to required high voltage and negative voltage, effectively improves the integration of the chip, and provides an efficient and compact isolated driving power supply solution for reliable application of IGBT in a high-frequency, high-voltage and high-power scene.

The application discloses a new energy island power grid transmission system through flexible DC overhead lines, adopts a bipolar DC structure, improves the flexibility and reliability of system operation, and energy storage devices are used for inhibiting intermittent characteristics and fluctuation characteristics of new energy; the coordinated cooperation of an AC energy consumption device at a sending end, a sending end flexible DC converter and new energy units realizes the consumption of surplus power at the sending end; the same outer loop controller is applied to a double closed loop control system of the sending end bipolar, so that the fighting phenomenon possibly occurring in the voltage frequency control of the sending end bipolar can be avoided; and the receiving end flexible DC converter station adopts a fixed DC voltage control strategy and a fixed active power control strategy, and when a DC line is faulty, the faulty current is controlled to be cut off, so that the DC fault self-clearing of the new energy island power grid transmission system through the flexible DC overhead lines is realized, and the technical problems of the coordinated control difficulty of the new energy and the flexible DC, the influence of power surplus on the stable operation of the system and the incapability of self-clearing of the DC side fault are solved.

A bipolar output cross regulation improvement circuit, the circuit comprises a bipolar output double-tube flyback converter, a cross regulation capacitor C p The bipolar output double-tube flyback converter comprises a DC input source u in , a power switch S1, a power switch S2, an excitation inductor L m , a transformer T, a clamping diode D 1p , a clamping diode D 2p , a diode D1, a diode D2, an output capacitor C 1, an output capacitor C 2; compared with the traditional bipolar output double-tube flyback converter, the present application can realize the improvement of cross regulation by only adding a cross regulation capacitor, without using a complex sampling and control algorithm, the implementation is simple, and the control and driving mode of the original circuit is not affected, the problem of uneven energy distribution caused by load disturbance is solved, the self-voltage balancing effect of the bipolar output circuit is realized, the voltage deviation is reduced, and it is suitable for occasions requiring bipolar voltage power supply.

The invention discloses a vibration capacitance type high-voltage static measurement probe suitable for an inclined curved surface. The vibration capacitance type high-voltage static measurement probe comprises a vibration capacitance type static probe, an amplitude-stabilized oscillator, a signal amplifier, an amplitude comparator, an adjustable direct-current voltage stabilization module, a bipolar voltage amplification module, a voltage superposition module and a voltage display module. One end of the cantilever beam is fixedly connected with the shell, the free end of the cantilever beam extends to the end face, a first piezoelectric element is arranged on the cantilever beam, and a sensitive electrode exposed through an opening is arranged at the free end of the cantilever beam; the amplitude-stabilized oscillator drives the piezoelectric element to enable the cantilever beam to vibrate, the sensitive electrode outputs a signal in direct proportion to the potential difference of the surface to be measured and the probe, and the signal is amplified by the signal amplifier and then transmitted to the amplitude comparator; the amplitude comparator regulates and controls the output of the two voltage modules, the voltage superposition module superposes the voltage of the two voltage modules and then applies the superposed voltage to the probe, and the voltage display module monitors the superposed voltage. The inclined curved surface can be measured without rotating the probe, concentrated discharge of an electric field is avoided, and wide-range and high-precision rapid continuous measurement is realized.

The embodiment of the invention discloses an H-bridge circuit control method, electronic equipment and a switching power supply. For an H-bridge circuit comprising a first switching tube group and a second switching tube group, the control method comprises the following steps: setting a target state and a target voltage of the H-bridge circuit; obtaining a duty ratio according to the output voltage and the target voltage; performing PWM modulation on the first switching tube group according to the duty ratio, the target state and the target voltage; and according to the target state and the target voltage, the second switching tube group is controlled to maintain a corresponding on or off state, so that the charging and discharging state of the H-bridge circuit reaches the target state, and the output voltage reaches the target voltage. By means of the mode, flexible switching between the BUCK mode and the BOOST mode can be achieved under the same H-bridge circuit topology, the defect of unipolar output is overcome, random combination of positive and negative bipolar voltage output and charging and discharging states is achieved, and the application scene and the use scheme of the H-bridge circuit are expanded.

The embodiments of the present application provide a method for determining the driving voltage of a display panel, a driving chip, and a display panel. The method for determining the driving voltage of a display panel includes: obtaining a target light-emitting driving current corresponding to the maximum brightness parameter in a target brightness parameter range; determining a target bipolar voltage drop of a driving transistor based on the target light-emitting driving current; the target light-emitting driving current and the target voltage drop satisfy the performance function of the driving transistor; and determining a first power supply voltage corresponding to the maximum brightness parameter in the target brightness parameter range based on the target bipolar voltage drop. The present application is conducive to reducing power consumption; it is conducive to ensuring that the driving transistor can operate in the saturation region and maintain the stable operation of the display panel. According to the performance function, the first power supply voltage corresponding to multiple brightness parameter ranges can be obtained. It is conducive to reducing the difficulty of obtaining the first power supply voltage and improving the feasibility of preparing a display panel that can dynamically adjust the first power supply voltage.

The application discloses a kind of based on the flexible direct current line differential protection method and system of berilong line mode differential integral current, by obtaining the geometric parameter of direct current line, calculating frequency variable polar domain impedance and admittance matrix, and selecting the line mode wave impedance, resistance and propagation coefficient under specific frequency;Real-time acquisition of the bipolar voltage and current at the two ends of line, after obtaining line mode by polar mode transformation, the line mode current of line reference point is accurately calculated using berilong model;Through band-pass filtering to suppress noise, and through optical fiber channel to realize the synchronization and compensation of two-end data;The sum of the reference point current at both ends is taken to generate the berilong line mode differential current, and then the line mode differential integral current is obtained by integrating the cumulative data window;Finally, the fault is determined by comparing the integral current with the action threshold value.The application solves the problem of single ground fault identification, and is suitable for reliable protection of flexible direct current line in new energy access scenario.

This invention discloses a high-gain bidirectional converter and its control method, belonging to the field of converter technology, including: a first inductor L1, a second inductor L2, first to fifth switching transistors S1 to S5, and first to M+1 diodes D. B1～ D Bm+1 The invention comprises first to Mth SM1 (sub-module) units and first to Nth SM2 units, wherein the SM1 unit is a half-bridge MMC (Modular Multilevel Converter) module, and the SM2 unit is a rechargeable and bidirectional discharge MMC sub-module; it also includes an output voltage step amplitude sampling stage, a transfer function calculation stage, a carrier stage, a comparison stage, a delay stage, and a drive signal generation stage. This invention can significantly increase voltage gain while suppressing charging current peaks and reducing charging losses, and achieves closed-loop control of bipolar voltage with a single voltage sensor.

The application discloses a bipolar voltage-sharing dual active bridge DC converter and a dead-zone sensing soft-switching design method and a control system. The converter comprises a primary side cross-parallel boost unit, a primary side active bridge, a high-frequency three-winding transformer, a secondary side active bridge, a split output capacitor and a secondary side voltage-balancing coupled inductor. The primary side cross-parallel boost unit makes the input branch high-frequency ripples offset each other through two coupled boost inductors and staggered driving. The secondary side voltage-balancing coupled inductor is respectively connected in series with two secondary side winding branches and simultaneously serves as a dual active bridge power transmission inductor and a bipolar output voltage automatic balancing channel. The design method is based on a reachable clamping state and a voltage clamping / current zero-crossing event propagation dead-zone commutation track. At the end of the dead zone, the zero-voltage turn-on condition is judged according to the secondary side bridge arm node voltage, so that the soft-switching boundary under different load imbalance degrees, output powers and coupling coefficients is obtained. The control system comprises a sampling module, a controller and a driving module.