CN210954206U - Modular equipotential detection system - Google Patents
Modular equipotential detection system Download PDFInfo
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- CN210954206U CN210954206U CN201921713757.XU CN201921713757U CN210954206U CN 210954206 U CN210954206 U CN 210954206U CN 201921713757 U CN201921713757 U CN 201921713757U CN 210954206 U CN210954206 U CN 210954206U
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Abstract
The utility model discloses a modularization equipotential detecting system, more specifically, an equipotential detecting system for will detect, report to the police, signal output integration is as a module, including bridge rectifier circuit, voltage upper and lower limit comparator, zener diode, filter capacitance, ordinary triode, emitting diode, photoelectric triode. According to the system, after an external power supply signal is rectified by a bridge rectifier circuit, the high and low levels are output through the amplitude limiting of a Zener diode and the filtering action of a filter capacitor and the detection and amplification of a voltage upper and lower limit comparator, a common triode is triggered to be conducted to enable a light emitting diode to work, a photoelectric triode is conducted after receiving the signal of the light emitting diode, and the external relay is controlled to act through a signal relay solid state relay, so that the indication and the action are realized. The utility model discloses aim at miniaturizing equipotential detecting system, improve equipment's stability reduces equipment overall dimension, and convenient wiring is overhauld.
Description
Technical Field
The invention relates to a shore power connection system, in particular to a high-voltage shore power connection switch cabinet and a high-voltage shore power monitoring protection cabinet.
Background
Most European and American boats and ships are all in order being equipped with to berth the shore power system at present, and when boats and ships berth at the pier, use the shore power and stop the generator to play the effect of energy saving environmental protection, before shore power connection circular telegram, for the safety of protection operating personnel and boats and ships, must equipotential connection between hull and the ground, past equipotential connecting device is split type mostly, is unfavorable for maintaining and detection diode exposes in the salt fog environment for a long time, influences the life of equipment.
Disclosure of Invention
In order to solve the above problems, the present invention provides a modular equipotential detecting system, including:
the rectifier circuit comprises a bridge rectifier circuit, four rectifier diodes D1, D2, D3 and D4 form the bridge rectifier circuit and is used for converting input alternating-current voltage into direct-current voltage, a first voltage input end U1 to be detected is connected with one input end of the bridge rectifier circuit through a fuse FU1, and a second voltage input end U2 to be detected is connected with the other input end of the bridge rectifier circuit;
the filter capacitor C1 and the filter capacitor C1 are connected with the bridge rectifier circuit in parallel and used for filtering alternating current components in direct current voltage output by the bridge rectifier circuit;
the Zener diode D is connected with the bridge rectifier circuit in parallel and used for limiting the amplitude of the direct-current voltage output by the bridge rectifier circuit;
the voltage upper and lower limit comparator is formed by connecting two operational amplifiers A1 and A2 in parallel and is used for comparing the magnitude relation between the direct-current voltage output by the bridge rectifier circuit and the set comparison levels Ui1 and Ui2 and outputting high and low levels;
the operational amplifiers A1 and A2 are connected with the base electrode of a common triode through a detection diode and a resistor respectively, the emitting electrode of the common triode is grounded, and the collector electrode of the common triode is connected with a 5V power supply through the resistor and a light emitting diode;
the phototriode is used for responding to the signal of the light-emitting diode and controlling the action of a signal relay solid-state relay connected with an emitter of the phototriode; the signal relay solid-state relay is connected with the anti-impact capacitor in parallel and then grounded, and the collector of the phototriode is connected with a 5V power supply.
The resistors R1 and R1 'are connected in series to form a first group of voltage division circuits which are connected with the inverting input end of the operational amplifier A1, a comparison level Ui1 is set for the operational amplifier A1, one end of R1 in the first group of voltage division circuits is connected with a 5V power supply, and one end of R1' is grounded; the resistors R2 and R2 'are connected in series to form a second group of voltage division circuits which are connected with the non-inverting input end of the operational amplifier A2, a comparison level Ui2 is set for the operational amplifier A2, one end of the R2 in the second group of voltage division circuits is connected with a 5V power supply, and one end of the R2' is grounded; the output end of the bridge rectifier circuit is simultaneously connected with the non-inverting input end of the operational amplifier A1 and the inverting input end of the operational amplifier A2, and the output ends of the operational amplifiers A1 and A2 are connected with the same post-stage circuit.
All 5V power supplies are provided for the modular equipotential detection system by an external power supply through the isolation module or the transmitting module and supply power to the system.
The invention has the beneficial effects that: compact structure, small occupied space, material saving, convenient and fast operation and maintenance.
Drawings
FIG. 1 is a schematic diagram of a modular equipotential detection system of the present invention.
Detailed Description
As shown in fig. 1, D is a zener diode, connected in parallel with a bridge rectifier circuit, for limiting an amplitude of a dc voltage output by the bridge rectifier circuit; d1, D2, D3 and D4 are rectifier diodes, a bridge rectifier circuit is formed by the rectifier diodes D1, D2, D3 and D4 and used for converting input alternating-current voltage into direct-current voltage, a voltage input end U1 to be detected is connected with one input end of the rectifier circuit through a fuse FU1, and a voltage input end U2 to be detected is connected with the other input end of the bridge rectifier circuit; c1 is a filter capacitor connected in parallel with the bridge rectifier circuit and used for filtering the alternating current component in the direct current voltage output by the bridge rectifier circuit; RY1 and RY2 are signal relay solid-state relays, R1, R1 ', R2 and R2' are voltage dividing resistors, a1 and a2 are operational amplifier circuits, 1D1 and 2D1 are detector diodes, T1 and T2 are common triodes, 1D2 and 2D2 are light emitting diodes, 1T1 and 2T1 are phototransistors, and 1C1 and 2C1 are anti-impact capacitors. U2 is connected with ground at the distal end, and V + is the positive input end of the working power supply of system, and the positive input end has been handled on the circuit board, only has a contact, "" is the negative input end of the working power supply of system, and the negative pole is reliably connected with the ground connection of equipment or boats and ships to be examined simultaneously.
Because the operational amplifier circuit in fig. 1 is not provided with a feedback resistor, or the feedback resistor tends to infinity in an open loop state, and theoretically the open loop multiple of the operational amplifier circuit is also infinity, the LM324 integrated operational amplifier adopted by the system has an open loop amplification factor of about 100dB, and at this time, the operational amplifier circuit forms a voltage comparator, as shown in fig. 1, the voltage upper and lower limit comparator is formed by connecting two operational amplifiers a1 and a2 in parallel, and is used for comparing the magnitude relation between the output direct current voltage of the bridge rectifier circuit and the set comparison levels Ui1 and Ui2 and outputting high and low levels; the resistors R1 and R1 'are connected in series to form a first group of voltage division circuits which are connected with the inverting input end of the operational amplifier A1, a comparison level Ui1 is set for the operational amplifier A1, one end of R1 in the first group of voltage division circuits is connected with a 5V power supply, and one end of R1' is grounded; the resistors R2 and R2 'are connected in series to form a second group of voltage division circuits which are connected with the non-inverting input end of the operational amplifier A2, a comparison level Ui2 is set for the operational amplifier A2, one end of the R2 in the second group of voltage division circuits is connected with a 5V power supply, and one end of the R2' is grounded; the output of the bridge rectifier circuit is connected with the non-inverting input end of the operational amplifier A1 and the inverting input end of the operational amplifier A2 at the same time, and the output ends of the operational amplifiers A1 and A2 are connected with the same post-stage circuit.
As shown in fig. 1, the normal triode is used for isolating the influence of the front-stage circuit on the rear-stage circuit, two output ends of the operational amplifiers a1 and a2 are respectively connected with the base of the normal triode through a detection diode and a resistor, the emitter of the normal triode is grounded, and the collector of the normal triode is connected with a 5V power supply through a resistor and a light emitting diode; and the photoelectric triode is used for responding to a signal of the light emitting diode and controlling the action of a signal relay solid-state relay connected with the emitter, the signal relay solid-state relay is connected with the anti-impact capacitor in parallel and then is grounded, and the collector of the photoelectric triode is connected with a 5V power supply.
Normal operating conditions 1: the input signal is rectified and then simultaneously input between the positive input end of the operational amplifier circuit A1 and the negative input end of the operational amplifier circuit A2, when the output direct current voltage Ui of the bridge rectifier circuit is greater than Ui1, the operational amplifier circuit A1 outputs high level, the detection diode 1D1 and the detection diode 1R1 trigger the common triode T1 to be conducted, the light emitting diode 1D2 works, and the photoelectric triode 1T1 works to drive the signal relay solid state relay to act to output signals to the outside. This state indicates that the vessel or equipment is at a potential above "earth" and there is a ground fault at the equipment or vessel end that does not allow further operation.
Normal operating conditions 2: similar to the case 1, the input signal is rectified and then simultaneously input between the positive input end of the operational amplifier circuit a1 and the negative input end of the operational amplifier circuit a2, when the output direct current voltage Ui of the bridge rectifier circuit is less than Ui2, the operational amplifier a2 outputs high level, the detection diode 2D1 and the detection diode 2R1 trigger the normal triode T2 to be conducted, the light emitting diode 2D2 works, and the photoelectric triode 2T1 works to drive the signal relay solid state relay to act, so as to output the signal externally. This state indicates that the device is normal, allowing further operation.
Abnormal conditions are as follows: when the input potential is high, the high potential may damage the detection circuit, and in order to prevent this, a zener diode is added after the rectifier circuit to achieve the amplitude limiting effect. When the electric potential is too high and there is resistance ground connection at the near-end, fault voltage will switch on with ground through rectifier equipment, will produce the heavy current this moment, for preventing that the heavy current from damaging the rectifier circuit, set up fuse FU1 at the electric potential input end, fusing when the electric current is too big to protection back-end circuit safety.
Other descriptions: the system does not serve as a judgment condition for 'permission of ship connection' when the shipborne shore power is connected, and ensures the conduction of a safety circuit when the ship is connected, namely, the ship connection operation can be carried out under the condition that the safety circuit is established and the electric potential is equal, the system can establish a signal through acquiring the safety circuit to output the 'permission of ship connection' condition, and can only output 'equipotential connection' as one of the judgment conditions for 'permission of ship connection'.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (3)
1. A modular equipotential detection system, comprising:
the detection circuit comprises a bridge rectifier circuit, four rectifier diodes D1, D2, D3 and D4 form the bridge rectifier circuit and is used for converting input alternating-current voltage into direct-current voltage, a first voltage input end U1 to be detected is connected with one input end of the bridge rectifier circuit through a fuse FU1, and a second voltage input end U2 to be detected is connected with the other input end of the bridge rectifier circuit;
the filter capacitor C1, the filter capacitor C1 is connected in parallel with the bridge rectifier circuit and is used for filtering an alternating current component in the direct current voltage output by the bridge rectifier circuit;
the Zener diode D is connected with the bridge rectifier circuit in parallel and used for limiting the amplitude of the direct-current voltage output by the bridge rectifier circuit;
the voltage upper and lower limit comparator is formed by connecting two operational amplifiers A1 and A2 in parallel and is used for comparing the magnitude relation between the direct-current voltage output by the bridge rectifier circuit and the set comparison levels Ui1 and Ui2 and outputting high and low levels;
the operational amplifiers A1 and A2 are connected with the base electrode of one common triode through a detection diode and a resistor respectively, the emitting electrode of the common triode is grounded, and the collector electrode of the common triode is connected with a 5V power supply through a resistor and a light-emitting diode;
the photoelectric triode is used for responding to the signal of the light emitting diode and controlling the action of a signal relay solid-state relay connected with an emitter of the photoelectric triode; the signal relay solid-state relay is connected with the anti-impact capacitor in parallel and then grounded, and the collector of the phototriode is connected with a 5V power supply.
2. The modular equipotential detecting system according to claim 1, wherein resistors R1 and R1 'are connected in series to form a first group of voltage divider circuits, one end of each of R1 of the first group of voltage divider circuits is connected to the 5V power supply, and the other end of each of R1' is connected to the ground, and the first group of voltage divider circuits is connected to the inverting input terminal of the operational amplifier a1 to set the comparison level Ui1 for the operational amplifier a 1; resistors R2 and R2 'are connected in series to form a second group of voltage division circuits, the second group of voltage division circuits are connected with the non-inverting input end of the operational amplifier A2, a comparison level Ui2 is set for the operational amplifier A2, one end of R2 in the second group of voltage division circuits is connected with a 5V power supply, and one end of R2' is grounded; the output end of the bridge rectifier circuit is simultaneously connected with the non-inverting input end of the operational amplifier A1 and the inverting input end of the operational amplifier A2, and the post-stage circuits connected with the output ends of the operational amplifiers A1 and A2 are the same.
3. The modular equipotential detection system of claim 1, wherein all of the 5V power is provided to the modular equipotential detection system and supplies power to the system by an external power source through an isolation module or a transmission module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921713757.XU CN210954206U (en) | 2019-10-14 | 2019-10-14 | Modular equipotential detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921713757.XU CN210954206U (en) | 2019-10-14 | 2019-10-14 | Modular equipotential detection system |
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| Publication Number | Publication Date |
|---|---|
| CN210954206U true CN210954206U (en) | 2020-07-07 |
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| CN201921713757.XU Active CN210954206U (en) | 2019-10-14 | 2019-10-14 | Modular equipotential detection system |
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|---|---|
| CN (1) | CN210954206U (en) |
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2019
- 2019-10-14 CN CN201921713757.XU patent/CN210954206U/en active Active
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