1204 results about "Bridge circuit" patented technology

The invention relates to the technical field of power conversion, and discloses an intelligent power converter system based on adaptive load regulation and a control method thereof. Comprising a power converter body, a plurality of sockets of different types are arranged on the power converter body, and a load sensing sensor, a micro-control unit, a step-down circuit and a bridge circuit are arranged in the power converter body; the load sensing sensor is electrically connected with the micro-control unit and is used for monitoring the power requirement of equipment connected with each socket in real time and transmitting a corresponding monitoring signal to the micro-control unit; the micro-control unit is electrically connected with the step-down circuit and the bridge circuit, and is used for controlling the step-down circuit and the bridge circuit to adjust output voltage and current according to a monitoring signal transmitted by the load sensing sensor; the micro-control unit controls the step-down circuit and the bridge circuit to automatically adjust the output voltage and current of the corresponding jacks according to the equipment power requirement monitored by the load sensing sensor, so as to realize the self-adaptive load adjustment of each jack.

The invention discloses a multi-objective optimization method and system for dual active bridge circuit expansion phase shift modulation, and the method comprises the steps: calculating a voltage matching ratio, and determining an external phase shift angle ratio based on a difference value between an output voltage and an output voltage reference value; according to the voltage matching ratio and the external phase shift angle ratio, obtaining an internal phase shift angle ratio of the primary side full bridge through an offline lookup table; calculating the maximum transmission power of the dual-active bridge converter, and determining a current working mode from the six preset working modes based on the size relationship between the inner phase shift angle ratio and the outer phase shift angle ratio; generating an optimal modulation strategy through a multi-objective optimization algorithm by taking the current effective value and the current peak value as optimization objectives and combining the voltage matching ratio and the periodic parameters of the current working mode; and generating a trigger signal of each switch tube of the dual-active bridge converter. Through six-mode working area division, complete differential algorithm boundary constraint and off-line-on-line collaborative optimization, the contradiction between the current stress and the soft switching range of the converter under extended phase shift modulation is solved.

A power tool is provided including a power supply interface receiving a removable battery pack, a brushless direct current (BLDC) motor including a rotor and a stator, and a multi-phase inverter bridge circuit. A controller is provided to output drive signals to the inverter bridge circuit to control flow of current from to the motor, where each drive signal is activated within each corresponding phase of the motor within a conduction band. The controller is configured to control a length of the conduction band at a variable value within a first torque range below a torque threshold and at a substantially constant value within a second torque range above the torque threshold. The torque threshold is greater than approximately 1 Newton-meters and the motor produces a maximum power output of at least approximately 1250 watts at the torque of approximately 1 Newton-meters.

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 an external phase shift angle determination method and system, a frequency conversion phase shift control method and a chip, and the method comprises the steps: obtaining an external phase shift angle based on a general solution of a time domain differential equation of a resonant inductor current and a resonant capacitor voltage of a DBSRC equivalent circuit and the symmetry of the DBSRC equivalent circuit; determining a first current value of the resonant inductor at the first moment and a second current value of the resonant inductor at the second moment; based on the first current value when the primary bridge circuit meets the ZVS soft switching requirement, obtaining a first relational expression of the external phase shift angle about the input voltage and the output voltage of the DBSRC and the switching frequency of the switching tube; based on a second current value when the secondary-side bridge circuit meets the ZVS soft switching requirement, obtaining a second relational expression of the external phase shift angle with respect to the input voltage, the output voltage and the switching frequency; according to the first relational expression, the second relational expression and the steady-state voltage value of the output end of the DBSRC, the expression of the external phase shift angle about the switching frequency, the steady-state voltage value and the input voltage is determined; the scheme is simple, the accuracy is high, and the portability is high.

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 invention discloses a high-power alternating-current impedance excitation circuit, a control method thereof and an electrolysis test system, and belongs to the technical field of power supplies and power electronics, the circuit is used as an alternating-current power supply in a high-capacity electrolysis test power supply, and the circuit is controlled by a controller to output an alternating-current signal so as to carry out an impedance test on an electrolytic bath. Compared with a full-bridge circuit, the alternating-current impedance excitation circuit adopts the multi-level converter, so that the output current harmonic content is low, the electrolysis efficiency is improved, the equipment loss is reduced, the economical efficiency of an electrolysis system is improved, stable operation of an electrolytic bath is ensured, and electrolysis interruption or faults caused by voltage fluctuation are reduced.

The embodiment of the invention discloses a multiplex type three-stage starting power generation controller, and relates to the technical field of aviation three-stage starting power generators. In the starting stage, an H-bridge inverter in the starting power generation controller provides single-phase alternating-current exciting current for a main exciter stator exciting winding through SPWM modulation so as to establish a pulsating magnetic field to provide exciting current for a main motor, and a three-phase full-bridge inverter provides armature current for a main motor stator armature winding through SVPWM modulation. In a power generation stage, an anti-parallel diode of the three-phase full-bridge inverter is used as a rectification circuit of the auxiliary exciter, and the H-bridge inverter adopts a PWM chopping mode to operate as an asymmetric half-bridge circuit. A power generation controller and a starting controller are integrated into a whole, and by changing the modulation mode of a hardware circuit, the control function of the three-stage starting generator at different stages can be realized by only one controller, so that the structure of the starting power generation controller is simplified, the system integration degree of the three-stage starting generator is improved, and the volume and the weight of the system are reduced.

An output node of a high-side driver circuit 220 is connected to a gate of a high-side transistor MH. The high-side driver circuit 220 is operable in a first mode in which the high-side driver circuit 220 outputs a drive current IHG_ON of a first current amount in a first period after a high-side control signal HGCTL transitioned from off-level to on-level, and outputs, in a second period following the first period, a drive current of a second current amount less than the first current amount.

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.

The invention relates to the technical field of three-phase power dynamic optimization double-phase output control, in particular to a three-phase power dynamic optimization double-phase output control method and device. The method comprises the following steps: collecting line voltage and load current signals of a three-phase power supply; identifying the load type according to the characteristics of the load current signal; determining a health degree evaluation value of each line according to the load type and the harmonic distortion rate and the voltage fluctuation rate of each line voltage; selecting the line with the optimal health degree evaluation value as a selected line; if it is determined that the health degree evaluation value of the selected line meets a preset safety condition, outputting a two-phase voltage including the selected line; and if the preset safety condition is not met, synthesizing two-phase voltage through a bridge circuit and outputting the two-phase voltage.

The utility model relates to a crosstalk suppression driving circuit of a silicon carbide MOSFET bridge circuit and power supply equipment. The crosstalk suppression driving circuit comprises an upper bridge driving module, an upper bridge crosstalk suppression module, a lower bridge driving module and a lower bridge crosstalk suppression module. The upper bridge driving module is respectively connected with the upper bridge crosstalk suppression module and the upper bridge arm, and the upper bridge crosstalk suppression module is also connected with the upper bridge arm; the lower bridge driving module is connected with the lower bridge crosstalk suppression module and the lower bridge arm, and the lower bridge crosstalk suppression module is further connected with the lower bridge arm. Each crosstalk suppression module and the corresponding bridge arm share a turn-off signal and a turn-on signal, and there is no need to additionally add a detection or control circuit to control the crosstalk suppression module. Each crosstalk suppression module is connected with the corresponding bridge arm in the turn-off process of the corresponding bridge arm, so that the forward driving crosstalk and the negative driving crosstalk of the silicon carbide MOSFET can be suppressed; and each crosstalk suppression module is automatically disconnected with the corresponding bridge arm before the corresponding bridge arm is conducted, so that the conduction loss of the bridge arm can be reduced, and the circuit efficiency is prevented from being reduced.

An electric apparatus includes a rotary electric machine, an electric power control unit, and an AC electric power source connection portion. The rotary electric machine includes a stator core on which a slot shared by a β-phase first coil and a β-phase second coil is formed. The electric power control unit includes: a third full-bridge circuit and a fourth full-bridge circuit that are connected to each of both ends of each β-phase coil; and a third connection-disconnection device and a fourth connection-disconnection device that are connected between each of one end of each β-phase coil and each full-bridge circuit. The AC electric power source connection member is connected to both ends of each connection-disconnection device such that magnetic fluxes are cancelled each other when a current supplied from an external AC electric power source to the β-phase coils that are magnetically coupled flows.

The invention discloses a BUCK-BOOST multi-stage half-bridge circuit series aging topological structure and a control method, and in the topological structure, a front-stage BUCK circuit and a rear-stage BOOST circuit are symmetrically designed by taking a voltage-stabilizing energy-storage capacitor as a center; the pre-stage BUCK circuit comprises a plurality of BUCK half-bridge units which are cascaded in sequence, and the post-stage BOOST circuit comprises a plurality of BOOST half-bridge units which are cascaded in sequence; the BUCK half-bridge unit and the BOOST half-bridge unit have the same circuit structure and each comprise an upper bridge arm and a lower bridge arm; in the BUCK half-bridge unit, an upper bridge arm switch and a lower bridge arm switch are connected to the output end of the upper stage, and an inductor L and the negative end of a lower bridge arm are connected to the input end of the lower stage; in the BOOST half-bridge unit, the inductor L and the negative end of the lower bridge arm are connected to the output end of the upper stage, and the upper bridge arm switch and the lower bridge arm switch are connected to the input end of the lower stage. According to the invention, cascade aging of BUCK and BOOST is realized, the aging efficiency is greatly improved, the energy loss is reduced, the cost is saved, the cascade aging is closer to system operation, the verification is more sufficient, and the working condition coverage is larger.

The application discloses a single-stage bidirectional power conversion topology structure capable of realizing wide-range soft switching and a control method thereof. The bridge-in and bridge-between phase shift control of a double half-bridge circuit and a high-frequency switch matrix provides a basis for realizing soft switching of all power tubes. The soft switching of a wide voltage variation range is realized by real-time adjustment of a switching frequency according to the size of a port voltage. The bridge arm current connected with the primary side of a second transformer is the sum of the primary side current of the second transformer and the inductance current connected with the primary side of the second transformer in parallel. By designing the inductance value of the parallel inductance connected with the primary side of the second transformer, the bridge arm current connected with the primary side of the second transformer can be effectively changed, so that the soft switching realization range of the switching tube of the bridge arm connected with the primary side of the second transformer under the wide power transmission range can be expanded.

An electric apparatus includes: an electricity storage device; a rotary electric machine including an α-phase first coil and an α-phase second coil; and an electric power control unit that controls electric power transfer of each of the electricity storage device and the rotary electric machine. The electric power control unit includes: a first full-bridge circuit connected to both ends of the α-phase first coil; and a second full-bridge circuit connected to both ends of the α-phase second coil. When electric power is transmitted via the α-phase first coil and the α-phase second coil between the first full-bridge circuit and the second full-bridge circuit, the electric power control unit controls a phase difference between the first full-bridge circuit and the second full-bridge circuit in a range that includes 90° to 180°.

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 relates to a method for the open- / closed-loop controlling of a stepper motor. The stator windings of the stepper motor are controlled via a full-bridge circuit with switching elements. The switching elements can be controlled in such a way that a rapid-decay mode or a slow-decay mode can be set. A charge cycle time in a pulse width modulation (PWM) period is stored, and the rapid-decay mode or the slow-decay mode for the next PWM period is set according to the charge cycle time. The invention additionally relates to a control unit, and a stepper motor comprising the full-bridge circuit and the control unit.

The invention relates to the technical field of flexible pressure sensors, and provides a low-temperature-drift flexible pressure sensor and a preparation method thereof.The low-temperature-drift flexible pressure sensor comprises an upper insulating layer, an upper sensor layer, a pressure isolation microstructure layer, a lower sensor layer and a lower insulating layer which are arranged from top to bottom; the electrodes of the first piezoresistive sensor group in the upper sensor layer are exposed to the external environment through the electrode holes of the upper insulating layer, and the electrodes of the second piezoresistive sensor group in the lower sensor layer are exposed to the external environment through the electrode holes and the communicating holes in the pressure isolation microstructure layer; the pressure isolation microstructure layer is provided with a concave part which covers the second piezoresistive sensor group; the two piezoresistive sensor groups are identical and are electrically connected to form a Huygens bridge circuit. The low-temperature-drift flexible pressure sensor realizes the compensation of the temperature drift of the sensor, reduces the influence of the temperature on the measurement precision of the sensor, has a high integration level, and facilitates the measurement of the surface of integrated equipment.

An electric apparatus includes an electric power storage device, a rotary electric machine, an electric power control unit, a motor temperature sensor, and a battery temperature sensor. The rotary electric machine includes each coil. The electric power control unit includes a first full-bridge circuit and a second full-bridge circuit that are connected to both ends of each coil, and a third full-bridge circuit and a fourth full-bridge circuit that are connected to both ends of each coil. The electric power control unit controls electric power supply of each coil in accordance with the temperature acquired by each temperature sensor, and switches between and performs a first mode in which a heat generation amount of the electric power storage device is larger than a heat generation amount of the rotary electric machine and a second mode in which a heat generation amount of the electric power storage device is smaller than that of the first mode.

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 discloses a single-stage AC-DC converter for a high-voltage pulse power supply and a modulation control method of the single-stage AC-DC converter, the single-stage AC-DC converter comprises an interleaved Boost circuit and a DC-DC converter, the primary side of a transformer in the DC-DC converter and the interleaved Boost circuit multiplex bridge arms of an AC full-bridge circuit, the secondary side of the transformer is connected with a clamping diode half-bridge three-level circuit, and the clamping diode half-bridge three-level circuit is connected with the DC-DC converter. The clamping diode half-bridge three-level circuit is connected in parallel with a voltage stabilizing capacitor; according to the interleaving Boost circuit adopted by the primary side, a two-stage medium-direct-current bus high-capacity electrolytic capacitor is canceled and replaced by a smaller filtering thin-film capacitor, so that the size of the converter is greatly reduced, and the power density of the converter is improved; and the secondary side adopts a clamping diode half-bridge three-level circuit structure, so that the voltage stress borne by the switching device is greatly reduced, and the switching device is more suitable for high-voltage and high-power occasions.

The invention relates to a coupled inductor current-limiting type hybrid direct-current circuit breaker topology and a working method. The coupled inductor current-limiting type hybrid direct-current circuit breaker comprises a current-carrying part and a breaking part, the current-carrying part is formed by connecting an ultra-fast mechanical switch UFD and a load change-over switch LCS in series, the breaking part comprises a bridge circuit, a first branch circuit, a second branch circuit, a third branch circuit, a fourth branch circuit, a fifth branch circuit and a sixth branch circuit, the fourth branch circuit is formed by connecting a thyristor, a coupling inductor and a primary side inductor in series to form a current-limiting branch circuit, and the fifth branch circuit is formed by connecting a secondary side inductor and a secondary side inductor. The sixth branch is formed by connecting a secondary side inductor of a coupling inductor with a thyristor in series and then connecting the secondary side inductor with a capacitor in parallel; the current limiting of the fault current is realized through the fourth branch, the fault breaking of the primary side inductor of the coupling inductor of the fourth branch is completed through the coupling effect of the secondary side inductor of the coupling inductor of the sixth branch, the peak value of the fault current is obviously reduced, and the breaking time is obviously shortened; the circuit breaker can quickly respond to faults of three working modes of current limiting breaking, reclosing and small current breaking; and the breaking part of the circuit breaker adopts the thyristors instead of the IGBTs, so that the cost of the circuit breaker is reduced.

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.

The invention discloses a rapid discharge control system and control method for an AC loop of an inverter. The rapid discharge control system comprises an inverter side circuit module, a mains supply detection module, a control module and a discharge execution module, the inverter side circuit module is used for forming a detection and electric loop; the mains supply detection module is used for judging whether the AC power grid has mains supply; the control module is used for receiving detection signals of the mains supply detection module and outputting driving control signals; and the discharge execution module is used for receiving the drive control signal of the control module and controlling the conduction states of a switch tube Q3 and a switch tube Q4 in the full-bridge circuit to form a discharge loop of the AC side capacitor. The hardware cost is not increased, and the problem of cost increase and hardware transformation workload are avoided. Rapid discharge of AC side capacitor voltage is realized through software control, and the risk of electric shock of operators is fundamentally avoided. The control algorithm is simplified, the DSP operation load is reduced, misjudgment can be avoided, and the accuracy and reliability of discharge triggering are ensured. The method has a wide application scene.

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 invention belongs to the technical field of electromagnetic detection, and particularly relates to an electromagnetic detection transmitting system for urban underground space and a control method, the electromagnetic detection transmitting system comprises a direct current power supply, an inverter and a load which form a traditional electromagnetic transmitting circuit, and a composite impedance matching network is connected in series between the inverter and the load; the composite impedance matching network comprises an active matching network and a passive matching network, the active matching network comprises an H bridge circuit composed of four IGBT transistors and a coupling transformer, one output end of the inverter passes through one end of the secondary side of the coupling transformer, and the primary side of the coupling transformer is connected with the H bridge circuit; and one end of the passive matching network is connected with the other end of the secondary side of the coupling transformer, the other end of the passive matching network is connected with one end of the load, and the other end of the load is connected with the other output end of the inverter, so that the situation that the emission energy of the full-aviation emission system of the unmanned aerial vehicle is weakened due to dynamic impedance change generated in actual motion is avoided.