10results about How to "Reduce radiation interference" patented technology

The invention discloses an MIMO terminal antenna loaded with lumped capacitance, and belongs to the technical field of wireless communication. The antenna comprises a horizontal dielectric substrate, two vertical dielectric substrates intersecting with the horizontal dielectric substrate, a metal ground and N dual-port coupled feed antenna pairs, 2N + 2 gaps are formed in the long edge of the metal ground, and the metal ground is printed on the upper surface of the horizontal dielectric substrate; the N dual-port coupled feed antenna pairs are arranged on the two vertical dielectric substrates, N / 2 dual-port coupled feed antenna pairs are arranged on the inner side of each vertical dielectric substrate, and each dual-port coupled feed antenna pair comprises a shared radiator, two feed branches, two L-shaped coupled feed branches and a lumped capacitor. Signals are transmitted to the shared radiator in an electromagnetic coupling mode, the lumped capacitance is loaded in the shared radiator, the matching impedance of the antenna structure is changed, signal loss is reduced, the bandwidth is improved, and meanwhile low cross coupling and small radiation interference are achieved.

The invention discloses a high-frequency transformer with low-voltage and high-current output. The high-frequency transformer comprises an inner copper bar sleeve, an outer copper bar sleeve and a high-voltage wire bag which are coaxially arranged inside and outside, a cavity extending in the axial lead direction in the inner copper bar sleeve is used for accommodating a transformer magnetic core; the outer copper bar sleeve is arranged on the inner copper bar sleeve in a sleeving manner in the axial lead direction; the high-voltage wire is wrapped between the inner copper bar sleeve and the outer copper bar sleeve and is insulated and isolated from the inner copper bar sleeve and the outer copper bar sleeve respectively; the inner copper bar sleeve and the outer copper bar sleeve are both secondary side coils of the high-frequency transformer. According to the invention, the high-voltage wire is wrapped between the two secondary coils of the inner copper bar sleeve and the outer copper bar sleeve, on one hand, the primary and secondary coils are well coupled, the reduction of the utilization rate of the wire due to the proximity effect under high frequency is reduced, and the power conversion efficiency is improved; on the other hand, the high-frequency high-voltage wire is wrapped by the inner and outer copper bar sleeves, so that radiation interference of high-frequency switch noise to the outside is effectively reduced; in addition, the inner copper bar sleeve and the outer copper bar sleeve have good thermal conductivity, heat dissipation performance and excellent through-current capability.

The utility model discloses a radio frequency channel switching control device and an electromagnetic compatibility test system. The radio frequency channel switching control device comprises an AC power supply interface, a radio frequency signal input interface, a first group of output interfaces, a second group of output interfaces, a switching power supply, a switching control unit, a relay connection circuit and a signal connection circuit board. The switching power supply is used for converting an alternating current power supply input by the AC power supply interface into a direct current to supply power to the relay connection circuit, and the switching control unit is used for outputting a radio frequency signal source input by the radio frequency signal input interface through the first output interface and the second output interface by controlling the power supply of the relay connection circuit; the number of output interfaces of the radio frequency signal source is expanded, so that the radio frequency signal source is respectively output to a power amplifier, a power test probe and the like. The signal output of each output interface of the radio frequency channel switching control device is controlled through the switch, so that the connection state of the radiation test equipment can be changed without manual switching, and the test efficiency is improved on the premise of ensuring the minimum radiation interference.

The present invention relates to an infrared temperature measuring device and a gas stove using the infrared temperature measuring device, wherein the infrared temperature measuring device includes an infrared temperature measuring sensor for measuring temperature, and is characterized in that: it also includes a shell, the infrared temperature measuring sensor is installed in the shell, a transmission hole is opened on the surface of the shell, an anti-fouling sheet capable of transmitting infrared light is arranged in the transmission hole, a detection channel connected to the transmission hole is arranged in the shell, and the infrared temperature measuring sensor is arranged in the detection channel; the detection channel is straight and has an angle α with the horizontal plane, 18°<α<23°; a collimator is also arranged in the detection channel, which is located in front of the infrared temperature measuring sensor and is used to increase the measuring distance of the infrared temperature measuring sensor. Compared with the prior art, the present invention does not need to open a hole in the inner ring of the burner, can reduce most of the flame radiation interference, and ensure that the infrared temperature measuring sensor can still have a stable measurement result and a relatively accurate test accuracy under the condition of flame interference.

The application provides a motor terminal block assembly, an electric drive system and a hybrid vehicle. The motor terminal block assembly comprises: a terminal block body, wherein an installation portion is formed on the terminal block body; a first wiring assembly, wherein the first wiring assembly is installed on the installation portion and is used for being connected with a high-voltage electrical system; a second wiring assembly, wherein the second wiring assembly is installed on the installation portion and is used for being connected with the high-voltage electrical system; and a third wiring assembly, wherein the third wiring assembly is installed on the installation portion, is located between the first wiring assembly and the second wiring assembly and is used for being connected with a low-voltage electrical system; and wherein filter magnetic rings are respectively sleeved on the first wiring assembly and the second wiring assembly. The motor terminal block assembly integrates high-voltage and low-voltage plug-ins, filters harmonics through the filter magnetic rings, reduces the radiation interference of high-voltage signals on low-voltage signals, and places the low-voltage plug-ins in a shell to avoid the influence of low-voltage radiation current on electromagnetic compatibility level.

The invention provides a current detection device, system and method, and relates to the technical field of electromagnetic compatibility testing. The current detection device comprises a support and further comprises an electromagnetic body, a conversion connector and a pointer which are installed on the support, the pointer is rotationally connected with the support through a rotating shaft, the end, away from the support, of the rotating shaft is connected with the electromagnetic body, the electromagnetic body is used for driving the pointer to deflect, and the conversion connector is electrically connected with the electromagnetic body. The conversion connector comprises a moving contact and a fixed contact which are used for conducting electricity, the fixed contact is fixedly installed on the support, the moving contact is fixedly connected with the pointer, the pointer is configured to enable the moving contact to abut against the fixed contact when the pointer is fully deviated, and the conversion connector is configured to switch a current path to enable the electromagnetic body to be short-circuited when the moving contact is connected with the fixed contact. When the current detection device is used for measuring the standby current of the DUT, the current detection device can be directly connected in series with an ampere meter with a larger range to measure the working current. The invention has the effect of continuously measuring the standby current and the working current of the DUT so as to simplify the measurement process.

The present invention provides a current detection device, system and method, which relate to the field of electromagnetic compatibility testing technology. A current detection device includes a bracket, and also includes an electromagnetic body, a conversion joint and a pointer installed on the bracket. The pointer is rotatably connected to the bracket through a rotating shaft, and the end of the rotating shaft away from the bracket is connected to the electromagnetic body. The electromagnetic body is used to drive the pointer to deflect, and the conversion joint is electrically connected to the electromagnetic body. The conversion joint includes a moving contact and a fixed contact for conducting electricity. The fixed contact is fixedly installed on the bracket, and the moving contact is fixedly connected to the pointer. The pointer is configured to make the moving contact abut against the fixed contact when fully deflected, and the conversion joint is configured to switch the current path to short-circuit the electromagnetic body when the moving contact and the fixed contact are connected. The above-mentioned current detection device is used to measure the standby current of the DUT, and can be directly connected in series with an ammeter with a larger range to measure the working current. The present invention has the effect of continuously measuring the standby current and working current of the DUT to simplify the measurement process.

The utility model provides a cable head insulation paste reinforcement type cable, which relates to the technical field of power construction, and comprises a main body shell and a waterproof and fireproof mechanism, a connecting sheet is arranged on the outer side of the main body shell, the waterproof and fireproof mechanism is arranged on one side of the connecting sheet, and the cable is placed in the main body shell through the arrangement of the waterproof and fireproof mechanism. Then the two connecting pieces are attached to each other, the bolts are screwed into the connecting pieces, the bolts are tightly fixed to the connecting pieces through the nuts, the sealing layers are tightly attached to form a closed space, moisture is prevented from permeating along gaps of the shell, and the cable fireproof wrapping tape can serve as a physical barrier; according to the fireproof cable, the contact between the cable and external or internal flames is isolated, the development speed of fire behavior is delayed, the fireproof blanket is not easy to burn in the flames or is quickly carbonized after burning to form a heat-insulating carbonized layer, the cable is maintained to continue working within a certain time as much as possible, and personnel evacuation and emergency rescue in an emergency are facilitated.

The utility model relates to the technical field of light curtains, in particular to a light curtain control device which comprises a channel auxiliary control board. The light curtain emission main control board is electrically connected with the channel auxiliary control board; the light curtain emission expansion board is cascaded with the light curtain emission main control board and is provided with an infrared emission tube; a channel main control board; the light curtain receiving main control board is electrically connected with the channel main control board; and the light curtain receiving expansion board is cascaded with the light curtain receiving main control board and is provided with an infrared receiving tube matched with the infrared transmitting tube. According to the scheme, when multiple light curtains are used in one device, the occupied interface resources of the channel auxiliary control board and the channel main control board are reduced, wires are effectively saved, and wiring is simplified.

This application relates to an irradiation testing system for nuclear power robots. The system includes an irradiation source, at least one irradiation platform, a testing device, and a central control device. The irradiation platform carries the component under test and is positioned close to the irradiation source. The testing device is connected to both the component under test and the central control device via wiring to collect electrical parameters of the component under test during irradiation. The central control device analyzes the radiation resistance of the component under test based on these electrical parameters. A first isolation component is provided between the testing device and the irradiation source. A second isolation component is provided between the central control device and the irradiation source. By collecting the electrical parameters of the component under test in real time during irradiation through the testing device and analyzing them through the central control device, online dynamic monitoring and accurate determination of the radiation resistance of the nuclear power robot are achieved, thereby improving testing accuracy.