49results 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 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 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.