48results about How to "Prevent reverse connection" patented technology

Positive and negative poles of a solar cell module (10) are split to take out a pair of positive and negative cables (11), and a two-pole connector (20) where terminals (15) are connected is integrally formed at the forward end of each cable (11). The terminals (15) in the two-pole connector (20) arranged on one side of the solar cell module (10) are plugs for the positive pole and negative pole, and the terminals (15) in the two-pole connector (20) arranged on the other side of the solar cell module (10) are sockets for the positive pole and negative pole. Both two-pole connectors (20) on the plug side and socket side arranged between adjacent solar cell modules (10) are each provided with a projection section (37) as a reverse connection preventing part. The projection sections (37) allow the connection between the connectors (20) when the positive and negative poles of one connector (20) have the same polarilities as those of the other, and prevent the connection when the positive and negative poles of one connector (20) have the different polarities from those of the other.

The invention discloses a tool capable of conveniently testing motor torque. A hollow weight axle tube is rotationally connected to a fixed connecting base, one end of the weight axle tube is providedwith a torque testing assembly for testing motor output torque, a plurality of centers elastically sliding in the axial direction are arranged inside the weight axle tube, a testing positioning auxiliary mechanism which can perform positioning and pressing fixing on a motor body when a motor output shaft stretches into the weight axle tube is arranged at the other end side of the weight axle tubeon the fixed connecting base, when the motor output shaft stretches into the weight axle tube, the end of the motor output shaft abuts against and presses some centers to slide in the axial direction, the side faces of the other centers abut against the flat structure of the motor output shaft so as to transmit torque to enable the weight axle tube to rotate along with rotation of the motor output shaft, then, torque transmission can be achieved, and the tool has the advantages of being simple in structure, needing no correction, and being convenient to operate.

The invention discloses a smart water cup for children. The smart water cup for children includes a cup cover and a cup body connected to the cup cover; the cup cover includes a hemispheric hollow-structured upper cover, and a cup cover body hinged to the upper cover; and the cup body includes a middle cover hinged to the upper cover, a cup cover lower shell with one end connected to the middle cover and the other end in threaded connection with the cup body, the middle cover arranged between the upper cover and the cup cover lower shell, a through hole arranged in the center of the middle cover and communicating the cup body, a control main board arranged in the middle cover, a control circuit installed on the control main board, and a temperature probe, a flowmeter, a horn, a power source and a display device connected to the control circuit. The smart water cup for children has simple principles and is easy to realize. The flowmeter can be used to obtain children's daily water drinking situation conveniently, so as to provide data support for subsequent management of children's water drinking and facilitate the cultivation of healthy water drinking habits of children. The smartwater cup for children has high practical value and promotion value.

The embodiment of the invention relates to the technical field of power supplies, and discloses an anti-reverse-connection power supply protection circuit, a power supply management system and a robot. The power supply protection circuit comprises: an NMOS transistor and a first resistor; the grid electrode of the NMOS transistor is connected with the positive electrode of a direct-current power supply through the first resistor; the drain electrode of the first resistor is connected with the negative electrode of the direct-current power supply, the source electrode of the first resistor is connected with the negative electrode of a load, the first resistor provides bias voltage for the NMOS tube, and the direct-current power supply and the load are controlled to be disconnected by applying the switching characteristic of the NMOS tube when the direct-current power supply is reversely connected. Through the mode, the embodiment of the invention can effectively prevent the reverse connection of the power supply, reduces the conduction voltage drop, and is low in cost and power consumption.

An embodiment of the application provides a detection circuit and a power supply circuit, relates to the field of power, and can detect a ground resistance of a cable on-line in a power supply systemhaving a neutral ground point. The solution is that the detection circuit comprises a variable voltage circuit and a current measuring circuit, wherein the variable voltage circuit comprises a first voltage source and a second voltage source, one end of the first voltage source is grounded through the current measuring circuit and the other end is used for connecting a first cable, the first cableis connected to the negative pole of a first diode in the power supply circuit, the positive pole of the first diode is connected to the positive output end of the power supply circuit, and the firstvoltage source is used to make the output current of the positive output end change to zero; one end of the two voltage source is grounded through the current measuring circuit and the other end is used for connecting a second cable, the second cable is connected to the positive pole of a second diode in the power supply circuit, the negative pole of the second diode is connected to the negativeoutput end of the power supply circuit, and the second voltage source is used to make the output current of the negative output end change to zero. The embodiment of the application is used for measuring ground resistances.

The invention discloses a WIFI module test method and test system. The test system comprises a scanning device, a test device and a wireless network card, wherein the scanning device is used to acquire IMEI information of a target WIFI module and send the IMEI information to the test device; the test device is used to set the IMEI information as a target WIFI hotspot name of the target WIFI module; the wireless network card is used to obtain a WIFI hotspot name list in a set range and send the WIFI hotspot name list to the test device; and the test device is used to determine whether the target WIFI hotspot name is in the WIFI hotspot name list, and if yes, the test device determines that the target WIFI module is successfully opened. According to the scheme of the invention, a mobile network of a wireless communication module can be converted into a WIFI signal, and thus the test efficiency can be improved, and the phenomenon of misjudgment can be reduced; and meanwhile, the problem of reverse connection between a test fixture and the WIFI module can be effectively prevented.

The invention discloses a DC 110V digital quantity acquisition card based on a compact peripheral component interconnect (CPCI) bus, which comprises a self-checking control circuit, a digital quantity conditioning circuit, an optical coupler isolation and acquisition circuit, a three-state buffer, a PCI bridge and a peripheral circuit. The digital quantity conditioning circuit receives relay contact information through an external input port connector; the output end of the digital quantity conditioning circuit is connected with the optical coupler isolation and acquisition circuit; the output end of the optical coupler isolation and acquisition circuit is connected to the PCI bridge through the three-state buffer; the PCI bridge performs data interaction with a CPCI computer through a PCI bus; and the input end of the self-checking control circuit is connected with a control signal of the PCI bridge, and the output end of the self-checking control circuit is connected to the digital quantity conditioning circuit. As an expansion board of a CPCI computer, the DC 110V digital quantity input information of the subway vehicle-mounted relay can be effectively acquired, so that the state of the vehicle-mounted relay is monitored, the fault position can be quickly positioned, and a fault diagnosis effect is achieved.

The invention discloses an analog signal output circuit of a central air-conditioning partition controller. The analog signal output circuit of the central air-conditioning partition controller comprises an amplifying circuit and a voltage current switching circuit. A voltage signal is output by a frequency voltage switching circuit, and is output to a switch valve control module through the amplifying circuit and the voltage current switching circuit successively. The analog signal output circuit of the central air-conditioning partition controller has the characteristics of safety, stabilization, long service life, and extensive application range.

The invention discloses a control system for a novel mining lithium iron phosphate switched reluctance electric locomotive. The system comprises a battery pack management device, a switched reluctance electric locomotive control device and a charger which are connected with an explosion-proof plug respectively. The switched reluctance electric locomotive control device comprises a chopper controller, a photoelectric setter, a power conversion module, three Hall current sensors, six insulated gate bipolar transistors, a charging capacitor, a direct current contactor, a motor A-phase winding terminal block, a motor B-phase winding terminal block, a motor C-phase winding terminal block and two paths. The system has the advantages of high control accuracy and long equipment service life.

A power source protection device comprising at least the following: two or more isolation circuits, configured so as to connect between each charging power source and charging path, preventing a reversal connection of each charging power source; additionally, a control circuit, configured so as to connect between a charging source and an isolation circuit and, when two or more charging paths simultaneously access charging, to shut off a charging path so that only one charging path engages in charging. The present invention embodiment isolates and protects each charging path by means of connecting an isolation circuit between a charging source and a charging path, and, when an extra charging path exists, uses a control circuit for determination and selection, leaving only one charging path and thus providing protection to the charging circuit.

The embodiment of the present application provides a detection circuit and a power supply circuit, which relate to the field of electric power and can detect the resistance value of a cable to ground on-line in a power supply system with a neutral ground point. The solution is: the detection circuit includes a variable voltage circuit and a current measurement circuit; the variable voltage circuit includes a first voltage source and a second voltage source, one end of the first voltage source is grounded through the current measurement circuit, and the other end is used for connecting with the first cable connection, the first cable is connected to the cathode of the first diode in the power supply circuit, the anode of the first diode is connected to the positive output terminal of the power supply circuit, and the first voltage source is used to make the output current of the positive output terminal change to 0; the second One end of the two voltage sources is grounded through the current measurement circuit, and the other end is used to connect to the second cable, the second cable is connected to the positive pole of the second diode in the power supply circuit, and the negative pole of the second diode is connected to the negative output terminal of the power supply circuit connected, the second voltage source is used to make the output current of the negative output terminal change to 0. The embodiment of the present application is used to measure the resistance to ground.

The invention discloses an electrode sleeve, which includes a conductive sleeve body, an electrode cavity that can be inserted into an electrode is provided in the sleeve body, an electrode insertion port is provided on the upper part of the electrode cavity, and an electrode cavity is provided in the electrode cavity. The side wall is provided with a conductive first elastic extrusion part that is in contact with the electrode, and the outer side of the sleeve is provided with a conductive second elastic extrusion part that is in contact with the outer electrode. The lower part of the sleeve body is provided with a stop card that can be engaged with the external bayonet. The invention aims to provide an electrode cover with excellent contact with the output electrode and input electrode and a good fixation, and a detachable xenon headlamp using the electrode cover with the advantages of anti-breakdown, easy disassembly and installation, safety and stability.

The invention provides a current-limiting protection circuit, which comprises a rectifier diode, a voltage stabilizing diode, a PNP triode, a resistor and a PMOS transistor, wherein a positive electrode of the rectifier diode is connected with an input end of the current-limiting protection circuit, and a negative electrode of the rectifier diode is connected with a positive electrode of the voltage stabilizing diode; a negative electrode of the voltage stabilizing diode is connected with an output end of the current-limiting protection circuit; an emitting electrode of the PNP triode is connected with the negative electrode of the rectifier diode, a collecting electrode of the PNP triode is connected with a grid electrode of the PMOS transistor, and a base electrode of the PNP triode is connected with a drain electrode of the PMOS transistor; a source electrode of the PMOS transistor is connected with the output end of the current-limiting protection circuit; and two ends of the resistor are respectively connected with the emitting electrode of the PNP triode and the drain electrode of the PMOS transistor. The current-limiting protection circuit has the characteristics of high-speed disconnection and easy recovery, and can provide current-limiting protection for any DC circuits.

The invention discloses a control circuit capable of preventing supervoltage and preventing surge voltage. In the invention, the control of output voltage is achieved through controlling opening / closing of a field-effect tube; when the output voltage is higher than the upper limit of a set voltage, the grid potential of the field-effect tube is drawn down, the field-effect tube is in a closed state, and at the moment, load consumes charges stored in a capacitor; and when the output voltage is lower than the lower limit of the set voltage, the grid potential of the field-effect tube is drawn up, the field-effect tube is in a conducting state, and at the moment, current input through the field-effect tube supplies power for the load and charges the capacitor. The invention can prevent the load from being damaged by continuous high voltage and surge from, and simultaneously, continuous power supply of the load can be ensured through the capacitor when the field-effect tube is closed. At the same time, the invention can regulate a circuit according to the rated voltage of the load, so that the output voltage is matched with the rated voltage of the load to be applicable to the load with different rated voltages.

An embodiment relates to a controller and a motor assembly comprising same, the controller comprising: a substrate; a controller housing disposed on the substrate; a CM filter unit disposed between the substrate and the controller housing; a DM filter unit disposed under the CM filter unit; a controller cover disposed between the substrate and the DM filter unit; a power module unit disposed between the substrate and the controller cover; and a connector unit coupled to the substrate, wherein the power module unit comprises a power module and a mold unit surrounding the power module. Accordingly, the heat generating problem of the power module unit can be resolved.

The invention relates to the technical field of power supplies, and provides a parallel power supply protection circuit and electronic equipment. Each power supply branch comprises a power supply positive electrode interface, a power supply negative electrode interface, a power NMOS tube, a grid voltage bias circuit, a switch tube and a comparator; the power NMOS tube is connected to the negative power line in series, the drain electrode of the power NMOS tube, the first input end of the comparator and the power source negative interface are connected with one another, the source electrode of the power NMOS tube, the second input end of the comparator and the load negative end are connected with one another, and the grid electrode of the power NMOS tube is connected with the grid voltage bias end of the grid voltage bias circuit. The output end of the comparator is connected with the control end of the switching tube, and the access end of the switching tube is connected with the grid voltage bias circuit. According to the technical scheme, the power loss is very small, the universality is high, and the method can be applied to a-48V power supply system.