80 results about "Dummy load" patented technology

The utility model discloses a switching matrix of a high-power multipath coaxial switch, a coaxial switch switching matrix and a controller. The coaxial switch matrix comprises a plurality of coaxial switches, a plurality of output antennas, a plurality of power sources, a dummy load, a duplexer and a power combiner. The coaxial switch is used for connecting each component, the power source can be connected to any output antenna or dummy load, the duplexer is used for receiving two power sources and outputting the two power sources to any output antenna or dummy load, and the power combiner is used for receiving and combining a plurality of power sources and outputting the power sources to a specific output antenna or dummy load; and the controller is used for controlling the coaxial switch to switch.

A electromagnetic wave test device includes: a reverberation chamber; a first antenna installed inside the chamber and radiating electromagnetic waves of a frequency lower than the chamber's first resonance frequency; a second antenna installed inside the chamber and radiating electromagnetic waves of a frequency equal to or higher than first resonance frequency; a power supply device connected between a grounding member and first antenna and feeding power to the first antenna; a dummy load connected between the grounding member and first antenna; a first power loss inhibiting unit having an impedance corresponding to an allowed value for power loss according to first antenna in a case wherein electromagnetic waves are radiated from the second antenna; and a switching unit including a first switching unit that switches a connection destination of first antenna to one of the dummy load and the first power loss inhibiting unit.

The invention discloses a radio frequency dummy load multi-physical field simulation method, which comprises the following steps of S1, performing electromagnetic characteristic analysis on a radio frequency dummy load wave-absorbing structure, and calculating power loss distribution; s2, importing the power loss distribution into thermal simulation software, performing thermal simulation, and calculating steady-state temperature distribution of the radio frequency dummy load wave-absorbing structure in the oil medium; s3, taking the temperature distribution obtained by thermal simulation as a load, performing structural analysis on the radio frequency dummy load wave-absorbing structure, and obtaining thermal deformation of each part; and S4, introducing the radio frequency dummy load wave-absorbing structure after thermal deformation, updating the material characteristics, performing simulation, and finally obtaining the electromagnetic performance of the radio frequency dummy load wave-absorbing structure influenced by the temperature. By comprehensively considering the interaction of a plurality of physical fields such as an electromagnetic field, a thermal field and a mechanical field, the performance of the radio frequency dummy load in an actual working environment can be simulated more accurately, and potential design problems can be found, so that the design accuracy and reliability are improved.

The utility model provides an intelligent control silicon controlled rectifier stable output circuit. The intelligent control silicon controlled rectifier stable output circuit comprises a silicon controlled rectifier signal input circuit, a rectification filter circuit, an intelligent control dimming module and a load power supply circuit. The rectification filter circuit is connected with the output end of the silicon controlled signal input circuit and is connected with the load power supply circuit through the active damping circuit. The intelligent control dimming module forms a control loop with a rectification filter circuit and a load power supply circuit through a plurality of electronic switch tubes, resistors, capacitors and other elements. When sine wave alternating current is input, the load power supply circuit outputs the maximum output current to the LED load; when a phase switching signal is input, the signal control end of the intelligent control dimming module outputs a high level, so that electronic switching tubes in the dummy load holding circuit and the small board load holding circuit are conducted and form a current loop, and therefore, a silicon controlled rectifier can obtain enough holding current and work stably; and the stability of the intelligent control silicon controlled rectifier stable output circuit is improved.

The invention relates to the technical field of electromagnetic pulse simulators, and solves the technical problems of low efficiency, limited debugging precision and high debugging cost when an existing pulse source debugging system and method of an electromagnetic pulse simulator are used for debugging a pulse source of the electromagnetic pulse simulator. The invention discloses a pulse source debugging system and method for a large horizontal polarization radiation wave electromagnetic pulse simulator. According to the method, under the condition that only a simple dummy load module is connected, the influence of ground reflection and cone bottom reflection on a radiation electric field waveform index is avoided by reasonably arranging the position of an electric field sensor, and a radiation electric field waveform parameter at the actually measured electric field sensor is directly used as a debugging basis of a pulse source; and dynamically adjusting the state of the to-be-debugged pulse source through the remote control end. Therefore, large-scale antenna erection is avoided, and the requirements on debugging sites and environments are obviously reduced; the limitation of traditional indirect parameter debugging is broken through, and the accuracy of pulse source state parameters is improved; the debugging efficiency is greatly improved, the research and development period is shortened, and the cost is reduced.

The invention provides an adaptive switching method and device for an energy obtaining mode based on a radio frequency energy supply tag, relates to the technical field of circuit control, and is applied to an energy obtaining circuit. The energy obtaining circuit comprises a rectifier, an energy storage capacitor, a charge pump, a switched capacitor type step-down circuit, a low dropout linear regulator, a dummy load, a full charge judgment circuit, a clock generator, a timer and a switch control circuit. The method comprises the steps of obtaining direct-current voltage output by a rectifier; a dummy load is connected to the direct-current voltage, and a timer is started for timing; in the timing process, whether the direct current voltage reaches a preset threshold value or not is detected through a full-power judgment circuit, and a detection result is obtained; and based on the detection result and the timing ending signal, the control switch selects an energy storage mode or a direct connection mode to supply power to the radio frequency energy supply tag. In the mode, the energy storage mode and the direct connection mode are adaptively switched according to the magnitude of the radio frequency energy, high sensitivity and quick response are both considered, and the adaptability and the checking efficiency of the tag in a variable environment are remarkably improved.

The invention relates to the technical field of audio conversion output protection, and discloses a high-reliability and stable audio converter power amplifier output protection circuit, which comprises switch modules (130, 140) for receiving audio signals output by a power amplification module, a main control module (MCU), driving modules (180a, 180b) and a virtual load module (170), when the load is not connected to the output end of the power amplification module, the main control module (MCU) outputs a high-level control signal to trigger the driving modules (180a and 180b) to control the virtual load module (170) to be connected to the output end of the power amplification module.

The utility model belongs to the technical field of power supplies, and particularly relates to a sectional type self-adjusting dummy load device which comprises a first control circuit used for outputting a first control signal; the second control circuit is used for outputting a second control signal; the third control circuit is used for outputting a third control signal; and the dummy load power regulation circuit is used for changing the power of the dummy load according to the first control signal, the second control signal and the third control signal so as to maintain the stability of the output voltage. According to the invention, unstable factors such as output oscillation of each voltage section and the like can be solved, and the dummy load can be in a relatively low operation level, so that the power supply efficiency is improved.

The application discloses a liquid cooling dummy load testing device, system and method. The device comprises a case, a mainboard in the case and a plurality of simulated heat generating components on the mainboard. The mainboard comprises a plurality of partitions, each of which comprises a first fixing device and a first signal connecting device for connecting the simulated heat generating components, and a buried wire for power supply and signal transmission. Each simulated heat generating component comprises a second fixing device and a second signal connecting device for connecting the mainboard, a temperature sensor and a remotely controllable adjustable heating device. The simulated heat generating component is used for simulating a target component generating heat in a server, and the target component at least comprises a hard disk, a CPU, a GPU and a memory. The application solves the technical problem of lacking effective testing means for direct contact type liquid cooling cabinets in the related art.

A power amplifier arrangement for one or more antennas having a calibratable dummy load. The power amplifier arrangement includes a calibration arrangement that controls or defines an amount of power drawn by the dummy load in response to a power-responsive parameter that changes in response to an amount of power drawn by one or more power amplifiers of the power amplifier arrangement when amplifying an input signal to be transmitted by the antenna(s).

The invention discloses a multipath portable transmitter dummy load and a working method thereof, the multipath portable transmitter dummy load comprises a resistor module, a heat dissipation module, a test module, a connector and a cabinet module, the resistor module, the heat dissipation module and the test module are installed in the cabinet module, and the resistor module, a capacitor module and the test module are connected in parallel with a conversion module; the resistance module is used for absorbing electric energy output by the transmitter and simulating the real use environment of the transducer; the conversion module is connected with the transmitter through the case module, so that multi-channel power amplifier output of the transmitter can be switched to the resistor module; the test module is used for checking the integrity of the dummy load and monitoring the output parameters of the multi-channel power amplifier of the transmitter; and the heat dissipation module is used for dissipating heat of the resistor module. The device has the advantages of being small in size, light in weight, convenient to carry, capable of being used in a boat and the like, the convenience and working efficiency of a debugging test are improved, the device has the advantage of continuous emission, the troubleshooting time of an emitter can be shortened, the damage risk of the emitter is reduced, and the equipment reliability is improved.

1. Name of the designed product: digital television transmitter (dummy load). 2. Use of the designed product: for digital television transmitter. 3. Design points of the designed product: in shape. 4. Picture or photo best showing the design points: perspective view.

The invention discloses a flyback switching power supply and a cross regulation rate control method and circuit thereof, and belongs to the technical field of switching power supplies, the switching power supply comprises at least one main path output and one auxiliary path output, and the method comprises the following steps: detecting a first load state of the main path output and a second load state of the auxiliary path output; according to the first load state and the second load state, dynamically controlling the connection and disconnection of a controllable dummy load circuit connected in parallel with the main circuit output; and when the first load state represents that the main circuit is in a light-load or no-load state and the second load state represents that the auxiliary circuit is in a heavy-load state, controlling the controllable dummy load circuit to access the main circuit for output. The dummy load is dynamically connected to the main path, so that the cross adjustment rate of the multi-path flyback power supply is effectively improved when the main path is in light load and the auxiliary path is in heavy load, and the multi-path flyback power supply has low power consumption and high stability.

A radar transceiver having a transmitter including a phase shifter, comprising: a digital controller configured to provide a digital control signal indicative of a phase shift; a digital-to-analog converter configured to receive the digital control signal and provide an analog signal in accordance with the phase shift; the phase shifter configured to receive the analog signal and provide a phase-shifted output signal for transmission; a dummy load connected to receive the analog signal from the digital-to-analog converter and provide an analog output; a resistive network connected across the output of the dummy load; a test module configured to measure the analog output of the dummy load; and a controller module configured to control operation of the dummy load, the test module, and the digital controller during a self-test mode of operation by: enabling the dummy load; operating the digital controller to provide a series of digital control signals to the digital-to-analog converter; and operating the test module to measure the analog output of the dummy load to determine a linearity measurement of the digital-to-analog converter.

The invention relates to a simulation device and a using method thereof, the simulation device comprises a blade shell, a DCU board card, a function integration board and a signal input and output board, and the blade shell is provided with a containing cavity for containing cooling liquid; the DCU board card is arranged in the accommodating cavity, a first dummy load is arranged on the DCU board card, and the first dummy load is used for simulating a device generating heat in the server; the function integrated board is arranged in the accommodating cavity and comprises a control module; at least part of the signal input and output board is arranged in the containing cavity, the signal input and output board is used for supplying power to the first dummy load so that the first dummy load can generate heat and generate preset heat, and the heated and gasified cooling liquid in the containing cavity can flow out of the containing cavity and flow into the containing cavity after being liquefied; the control module is used for monitoring the real-time liquid level of the cooling liquid in the containing cavity.

The utility model relates to a dimming turn-off control circuit and a driving power supply. The dimming turn-off control circuit comprises a voltage feedback module, a dimming turn-off module, a loop feedback module and a dummy load module, the dimming turn-off module is turned on according to the dimming turn-off signal and pulls down a voltage feedback signal output by the voltage feedback module when the dimming turn-off module is turned on and controls the dummy load module to start working; the loop feedback module outputs a turn-off feedback signal to the main control chip according to the pulled-down voltage feedback signal, so that the main control chip turns off the output according to the turn-off feedback signal; and the dummy load module forms a dummy load loop during working. The output voltage of the voltage feedback module and the output voltage of the driving power supply are reduced through the dimming turn-off module, the purpose of dimming turn-off is achieved, meanwhile, a dummy load loop is formed through the dummy load module after dimming turn-off, an auxiliary power supply winding keeps certain energy, the output voltage is kept stable, the turn-off effect can be achieved, and the service life of the driving power supply is prolonged. And the problem of dimming flickering can be avoided, the reliability is good, and the cost is low.

The invention provides a control method and system of an air conditioner power supply circuit and the air conditioner power supply circuit, and the air conditioner power supply circuit comprises a voltage stabilization output end comprising a first dummy load circuit, a first non-voltage stabilization output end comprising a second dummy load circuit, and a second non-voltage stabilization output end comprising a third dummy load circuit. The first dummy load circuit, the second dummy load circuit and the third dummy load circuit at least comprise resistors. The method comprises the following steps: acquiring the number of pulses of power supply voltage of a first non-stabilized voltage output end in a preset time period; when the number of the pulses is greater than or equal to a preset threshold value and the first dummy load circuit is turned on, the resistance value of the first dummy load circuit is increased; and under the condition that the number of the pulses is smaller than a preset threshold value, the resistance value of the first dummy load circuit, the resistance value of the second dummy load circuit and the resistance value of the third dummy load circuit are adjusted according to whether the first dummy load circuit of the voltage stabilization output end is turned on or not. The problem that the air conditioner power supply voltage is prone to fluctuation is solved.

The utility model discloses a portable transmitter dummy load and a working method thereof, the portable transmitter dummy load comprises a resistor module, a capacitor module, a switching module, a test module, a ventilation module and a cabinet module, the resistor module, the capacitor module, the switching module and the ventilation module are installed in the cabinet module; the resistor module, the capacitor module and the test module are connected in parallel with the conversion module; the resistance module is used for absorbing electric energy output by the transmitter; the capacitor module plays a role in matching and filtering, and simulates a real use environment of the transducer; the conversion module is connected with the transmitter through the case module, so that 36 paths of power amplifier outputs of the transmitter can be switched to the resistor module and the capacitor module; the test module is used for checking the integrity of the dummy load and monitoring output parameters of 36 paths of power amplifiers of the transmitter; and the ventilation module is used for cooling the resistor module. According to the utility model, the transmitter can continuously transmit when being connected with the dummy load, so that the transmitter can be better tested and maintained.

A movable device and a block-type millimeter wave array antenna module thereof are disclosed. The block-type millimeter wave array antenna module includes an antenna-carrying substrate, an antenna signal transmission group, an antenna signal reception group, and a dummy load antenna group. A plurality of block-shaped carriers of the antenna-carrying substrate are divided into a plurality of first antenna-carrying blocks, a plurality of second antenna-carrying blocks, a plurality of third antenna-carrying blocks, and a plurality of fourth antenna-carrying blocks. The antenna signal transmission group includes a plurality of signal transmission antenna structures respectively carried by the plurality of first antenna-carrying blocks. The antenna signal reception group includes a plurality of signal reception antenna structures respectively carried by the plurality of second antenna-carrying blocks. The dummy load antenna group includes a plurality of first dummy load antenna structures respectively carried by the plurality of third antenna-carrying blocks and a plurality of second dummy load antenna structures respectively carried by the plurality of fourth antenna-carrying blocks. Thus, the present application can be used for wireless signal transmission and reception.

The utility model belongs to the field of direct current sources, and discloses a dummy load circuit for direct current source equipment, which comprises an output circuit, an output current sampling circuit, a dummy load control circuit and a dummy load circuit, the output circuit is connected with the output current sampling circuit, the dummy load control circuit and the dummy load circuit in sequence, and the dummy load circuit is connected with the output circuit; the output current sampling circuit is used for outputting a voltage value corresponding to a sampling current after the voltage values at the two ends of the sampling resistor are processed by an operational amplifier; and the dummy load control circuit is used for controlling connection and disconnection between the dummy load and the output end of the direct current source according to the sampling current value. According to the utility model, load discharge can be realized, no-load or light-load damage is prevented, voltage spikes are inhibited, and direct impact of extreme working conditions is avoided.

The utility model relates to the technical field of LED driving power supplies, in particular to a detection system of an LED driving power supply, which comprises a load condition detection unit, a two-in-one detection unit, a dummy load unit, a microcontroller unit and a main circuit of the LED driving power supply. The main circuit is used for generating voltage signals; the on-load condition detection unit is used for receiving the voltage signal, generating a level signal and transmitting the level signal to the microcontroller unit; the two-in-one detection unit is used for receiving the voltage signal, generating a short circuit detection signal and a load detection signal and transmitting the signals to the microcontroller unit; the dummy load unit is used for being connected in parallel with the output end of the main circuit after being controlled to be conducted by the microcontroller unit; the problems of circuit complexity and high power consumption caused by independent arrangement of a detection circuit and high power consumption caused by long-term parallel connection of dummy load circuits are solved.

An integrated circuit that includes multiple power rails with dummy loads configured on at least some of the power rails. The dummy loads are activated in response to a voltage overshoot condition on regions of the power rails at which the dummy loads are located. The dummy loads may be substituted for decoupling capacitors or other active cells at particular regions of the power rails.

The utility model relates to an airborne UHF frequency band power amplifier, and belongs to the technical field of amplifiers. The system comprises a signal amplification unit, a power amplification control unit, a secondary power supply, a dummy load, a liquid cooling box body and the like, and is characterized in that the signal amplification unit is used for amplifying an input signal; the power amplification control unit provides a logic control signal for the signal amplification unit; the power amplifier communicates with an upper computer, receives a command of the upper computer and reports the working state and fault information of the power amplifier; the power amplifier secondary power supply is used for converting input voltage into corresponding output voltage; the power amplifier control unit and the signal amplification unit are both connected with the power amplifier secondary power supply and are powered by the power amplifier secondary power supply; the power amplifier control unit is connected with the signal amplification unit and transmits control information to the signal amplification unit. According to the utility model, a plurality of problems of high power, miniaturization, high vibration magnitude, low-pressure environment, multi-carrier over-excitation and the like of the airborne countermeasure power amplifier are solved, and rapid interference on airborne equipment can be realized.

This invention provides a radio frequency (RF) output determination apparatus and a substrate processing apparatus including the apparatus, which can compensate for power loss in a high-power substrate processing apparatus. The RF output determination apparatus includes: an RF power supply; a sensor connected to the RF power supply via a first cable and a second cable; a dummy load connected to the sensor via the first cable; and an output value determination unit that determines the RF output of the RF power supply based on signal data obtained through the second cable, wherein the RF output takes into account the power loss in the first cable that is supplied to the dummy load.

The invention discloses a dummy load control circuit, a power panel and terminal equipment. The dummy load control circuit comprises an energy storage module, a voltage sampling module, a switch control module and an access control module, the energy storage module is connected to the circuit power supply end; the voltage sampling module is used for generating a first control signal when the sampling voltage is greater than or equal to a preset voltage threshold; the switch control module is used for being switched off during power-off or responding to the first control signal and generating a second control signal based on working voltage conduction during standby; and the access control module is used for responding to disconnection of the second control signal, electrically disconnecting the dummy load from the output end of the power panel, and electrically connecting the dummy load with the output end of the power panel based on connection of the energy storage voltage or the working voltage when the switch control module is disconnected. According to the invention, the dummy load is automatically switched according to the on-load of the output end of the power panel, and the access of the dummy load is maintained during power-off so as to discharge the electric energy stored by the capacitor at the output end, thereby improving the safety and reliability.

The utility model discloses electromagnetic emission equipment applied to an artificial source electromagnetic method, which comprises a dummy load device, the dummy load device comprises an upper opening box body, a binding post group and a load device formed by connecting five resistors in series, and the load device is arranged in the upper opening box body and is connected with a generator set through the binding post group; the binding post group comprises a total binding post, a large-current emission gear binding post and a small-current emission gear binding post. The dummy load device is used for replacing no-load operation, that is, the dummy load device simulates an actual load during the power-off period of the electromagnetic transmitter, so that the load fluctuation amplitude is reduced, the stability of the generator is kept, and smooth operation of the generator set is guaranteed; the connection mode can be adjusted according to the electrical resistivity of coupling of the electromagnetic transmitter and the ground so as to adapt to actual load simulation requirements during transmission of different currents.

The invention discloses an intelligent high-power radio frequency emission system, which relates to the technical field of radio and television engineering and comprises a radio frequency detection module, a display indication module, a temperature detection and control module, an impact power bypass protection switch module and an intelligent control module. The integrated radio frequency detection unit and the temperature monitoring system provided by the invention can feed back the working state of the dummy load in real time, quickly identify failure and overload conditions, and significantly improve the accuracy and timeliness of monitoring, and the intelligent control unit supports data recording and fault early warning functions, can automatically process faults and generate maintenance records, and improves the working efficiency. Compared with the prior art, manual intervention is reduced, the working efficiency is improved, the impact power bypass protection switch effectively prevents equipment damage caused by abnormal power rise, safe operation of a transmitter and a dummy load is guaranteed, dependence on manual regular inspection is reduced through online monitoring and data analysis, the system downtime is shortened, and the maintenance cost is reduced.

A load inductor has first and second nodes. The first node couples to a first terminal of a first switch. A second terminal of the first switch couples to an output of a first low noise amplifier (LNA). The second node couples to a third terminal of a second switch. A fourth terminal of the second switch couples to an output of a second LNA. In response to receiving a single-ended signal at the first LNA, the first LNA is turned on, the first switch is closed, the second LNA is turned off, and the second switch is opened. In response to receiving the signal at the second LNA input, the first LNA is turned off, the first switch is opened, the second LNA is turned on, and the second switch is closed. The signal is transformed to a differential signal across the first and second inductor nodes.

The present invention discloses a thyristor dummy load self-excitation circuit, comprising an EMI circuit, wherein the output end of the EMI circuit is connected to the input end of a rectifier circuit; the output end of the rectifier circuit is connected to the input end of an active and passive discharge circuit, the output end of the active and passive discharge circuit is connected to the input end of a PFC and LLC circuit, one output end of the PFC and LLC circuit is connected to one input end of the rectifier circuit via a dummy load circuit, one output end of the synchronous rectifier circuit is connected to one input end of a feedback loop, one output end of the feedback loop is connected to one input end of the PFC and LLC circuit, and one output end of the single-chip circuit is connected to another input end of a dimming MOS tube circuit. The self-excitation circuit has the advantages of low noise and low loss during dimming, and a smooth dimming process without flicker.

The invention discloses a dummy load design method for an LCC / S compensation type wireless charging system, and belongs to the technical field of wireless charging, and the method comprises the steps: calculating the maximum no-load output voltage of the wireless charging system; calculating the maximum safe no-load output voltage of the wireless charging system; judging whether a dummy load needs to be used or not and whether LCC compensation network parameters need to be readjusted or not; determining a dummy load resistance value meeting the maximum safe no-load output voltage to enable the rectifier bridge to work in a continuous or discontinuous state; and calculating a dummy load resistance value meeting the maximum safe no-load output voltage. The dummy load is additionally arranged at the output end of the LCC / S compensation type wireless charging system, and the parameters of the dummy load are designed, so that the problem of voltage rise during no-load operation of the wireless charging system is solved, and safe and stable operation of the system is guaranteed.