Intelligent controller for undervoltage protection on ship

Abstract

The utility model discloses an intelligent controller for undervoltage protection on a ship. The intelligent controller comprises a sampling circuit, a microprocessor, an electromagnet driving circuit and an electromagnet, the sampling circuit is electrically connected with the microprocessor, the microprocessor is electrically connected with the permanent magnet electromagnet driving circuit, and the electromagnet driving circuit is connected with the electromagnet. According to the utility model, the current and voltage of a line are continuously detected through the sampling circuit, and when a current or voltage fault is detected, the controller controls the electromagnet to separate and break the circuit breaker and instantly cut off the power supply of the electromagnet, so that the electromagnet is prevented from being influenced by overvoltage impact.

Description

Technical Field

[0001] This utility model belongs to the field of low-voltage switchgear technology, and in particular relates to an intelligent controller for undervoltage protection on ships. Background Technology

[0002] Currently, existing undervoltage controllers use undervoltage electromagnets and are controlled by AC380V. However, due to the frequent start-stop of marine generators, the voltage is unstable during power generation. In particular, high overvoltages, often exceeding AC500V, occur at the moment the circuit breaker trips, causing the undervoltage controller to burn out frequently. This results in difficult-to-repair malfunctions when the ship leaves the shore. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides an intelligent controller for undervoltage protection on ships.

[0004] This utility model is achieved through the following technical solution.

[0005] This utility model provides an intelligent controller for undervoltage protection on ships, comprising a sampling circuit, a microprocessor, an electromagnet drive circuit, and an electromagnet; the sampling circuit is electrically connected to the microprocessor, the microprocessor is electrically connected to the permanent magnet electromagnet drive circuit, and the electromagnet drive circuit is connected to the electromagnet.

[0006] Preferably, the sampling circuit includes a voltage sampling circuit, a current sampling circuit, a voltage conditioning circuit, and a current conditioning circuit. The voltage sampling circuit is electrically connected to the voltage conditioning circuit, the voltage conditioning circuit is electrically connected to the microprocessor, the current sampling circuit is electrically connected to the current conditioning circuit, and the current conditioning circuit is electrically connected to the microprocessor.

[0007] Preferably, the voltage sampling circuit includes a sampling resistor and a voltage transformer, wherein the sampling resistor is electrically connected to the voltage transformer, and the voltage transformer is electrically connected to the voltage conditioning circuit.

[0008] Preferably, the electromagnet driving circuit is a bidirectional driving electromagnet circuit.

[0009] Preferably, the electromagnet is a permanent magnet electromagnet.

[0010] Preferably, the electromagnet driving circuit includes an optocoupler and a MOSFET, the microprocessor is connected to the optocoupler, the optocoupler is electrically connected to the MOSFET, and the MOSFET is connected to the electromagnet.

[0011] The beneficial effects of this utility model are as follows:

[0012] 1. This utility model realizes continuous detection of line current and voltage through sampling circuit. When a current or voltage fault is detected, the controller controls the electromagnet to separate, disconnects the circuit breaker, and instantly cuts off the power supply to the electromagnet to protect it from the effects of overvoltage.

[0013] 2. This utility model can detect voltage or current faults. If it is a current fault, the mechanically locked circuit breaker cannot be closed by itself. The line fault needs to be manually cleared and the controller needs to be manually operated to pull back the electromagnet and unlock the circuit breaker closing part.

[0014] 3. Using permanent magnet electromagnets reduces energy consumption caused by continuous driving of ordinary electromagnets, avoids the reverse impact of coil induced current on the control circuit caused by continuous driving of ordinary electromagnets, and avoids the impact of generator overvoltage on the line and coil at the moment of circuit breaking. While reducing energy consumption, it also significantly reduces the failure rate of the controller. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the intelligent controller provided in this embodiment of the utility model;

[0016] Figure 2 This is a schematic diagram of the electromagnet drive circuit structure provided in this embodiment of the utility model;

[0017] Figure 3 This is a schematic diagram of the voltage sampling circuit and voltage conditioning circuit provided in this embodiment of the utility model;

[0018] Figure 4 This is a schematic diagram of the current conditioning circuit structure provided in an embodiment of the present invention. Detailed Implementation

[0019] The technical solution of this utility model is further described below, but the scope of protection is not limited to what is described.

[0020] like Figure 1 As shown, an intelligent controller for undervoltage protection on a ship includes a sampling circuit, a microprocessor, an electromagnet drive circuit, and an electromagnet; the sampling circuit is electrically connected to the microprocessor, the microprocessor is electrically connected to the permanent magnet electromagnet drive circuit, and the electromagnet drive circuit is connected to the electromagnet.

[0021] Electromagnets are used as the driving component for the circuit breaker to trip on board. The electromagnet driving circuit is controlled by a microprocessor, thereby controlling the electromagnet and realizing the circuit breaker tripping.

[0022] At the same time, it can automatically disconnect the circuit breaker when a fault occurs. Specifically, the sampling circuit collects voltage and current data, and the microprocessor determines whether a fault has occurred. After a fault is determined, the electromagnet drive circuit controls the electromagnet to disconnect, that is, controls the circuit breaker to disconnect.

[0023] In the case of a voltage fault, after the circuit breaker is disconnected and the voltage returns to normal, it can be closed by the microprocessor control. In the case of a current fault, when the circuit breaker is disconnected, the circuit breaker is mechanically locked by the mechanical locking drive circuit. The circuit breaker can only be closed by manually unlocking the mechanical lock after the fault is cleared, thus ensuring the reliability of the circuit breaker.

[0024] The sampling circuit includes a voltage sampling circuit, a current sampling circuit, a voltage conditioning circuit, and a current conditioning circuit. The voltage sampling circuit is electrically connected to the voltage conditioning circuit, the voltage conditioning circuit is electrically connected to the microprocessor, the current sampling circuit is electrically connected to the current conditioning circuit, and the current conditioning circuit is electrically connected to the microprocessor.

[0025] The sampling circuit is connected to the ship's electrical grid to collect and detect voltage and current data in real time. Specifically, the voltage sampling circuit collects voltage data and converts it into a signal that can be processed by a microprocessor through a voltage conditioning circuit; similarly, the current sampling circuit collects current data and converts it into a signal that can be processed by a microprocessor through a current conditioning circuit.

[0026] The voltage sampling circuit includes a sampling resistor and a voltage transformer. The sampling resistor is electrically connected to the voltage transformer, and the voltage transformer is electrically connected to the voltage conditioning circuit.

[0027] like Figure 3 As shown, this embodiment includes a voltage sampling circuit and a voltage conditioning circuit. The voltage sampling circuit is connected to the ship's electrical grid, collecting voltage division data through a sampling resistor. A voltage transformer isolates the primary and secondary circuits, protecting the controller's internal components from overvoltage surges during circuit breaker tripping. The voltage conditioning circuit converts the voltage data into data that can be processed by a microprocessor. Figure 4 As shown, this is the current conditioning circuit of this embodiment. IC5A is an integrator circuit chip, and IC5B is a multi-stage amplifier circuit chip. The current conditioning circuit converts the current signal collected by the current sampling circuit into data that can be processed by the microprocessor.

[0028] The electromagnet driving circuit is a bidirectional electromagnet driving circuit.

[0029] The circuit breaker is tripped by driving the electromagnet through a bidirectional drive electromagnet drive circuit.

[0030] The electromagnet is a permanent magnet electromagnet.

[0031] Using permanent magnet electromagnets reduces energy consumption caused by continuous driving of ordinary electromagnets, avoids the reverse impact of coil induced current on the control circuit caused by continuous driving of ordinary electromagnets, and avoids the impact of generator overvoltage on the line and coil at the moment of circuit breaking. While reducing energy consumption, it also significantly reduces the failure rate of the controller.

[0032] The electromagnet driving circuit includes an optocoupler and a MOSFET. The microprocessor is connected to the optocoupler, the optocoupler is electrically connected to the MOSFET, and the MOSFET is connected to the electromagnet.

[0033] The electromagnet drive circuit in this embodiment is as follows: Figure 2 As shown, optocouplers are used to isolate high-voltage and low-voltage circuits, protecting the internal components of the controller. The optocoupler connects to the MOSFET, which in turn drives the electromagnet, thus tripping the circuit breaker.

[0034] This invention enables continuous detection of line current and voltage through a sampling circuit. When a current or voltage fault is detected, the controller controls the electromagnet to separate, disconnecting the circuit breaker and instantly cutting off the power supply to the electromagnet to protect it from overvoltage impact. This invention can detect voltage or current faults. If it is a current fault, the circuit breaker is mechanically locked and cannot be closed automatically. The fault must be manually cleared before the controller is manually operated to pull back the electromagnet and unlock the circuit breaker's closing mechanism.

Claims

1. An intelligent controller for under-voltage protection on board a ship, characterized in that, The sampling circuit, microprocessor, electromagnet driving circuit and electromagnet are connected electrically; the sampling circuit includes voltage sampling circuit, current sampling circuit, voltage conditioning circuit and current conditioning circuit; the voltage sampling circuit is connected to the voltage conditioning circuit electrically; the voltage conditioning circuit is connected to the microprocessor electrically; the current sampling circuit is connected to the current conditioning circuit electrically; the current conditioning circuit is connected to the microprocessor electrically. The sampling circuit, microprocessor, electromagnet driving circuit and electromagnet are connected electrically; the sampling circuit includes voltage sampling circuit, current sampling circuit, voltage conditioning circuit and current conditioning circuit; the voltage sampling circuit is connected to the voltage conditioning circuit electrically; the voltage conditioning circuit is connected to the microprocessor electrically; the current sampling circuit is connected to the current conditioning circuit electrically; the current conditioning circuit is connected to the microprocessor electrically.

2. The intelligent controller of claim 1, wherein, The voltage sampling circuit includes sampling resistor and voltage transformer; the sampling resistor is connected to the voltage transformer electrically; the voltage transformer is connected to the voltage conditioning circuit electrically.

3. The intelligent controller of claim 1, wherein, The electromagnet driving circuit is a bidirectional driving electromagnet circuit.

4. The intelligent controller of claim 1, wherein, The electromagnet is a permanent magnet type electromagnet.

5. The intelligent controller of claim 1, wherein, The electromagnet driving circuit includes optical coupler and MOS tube; the microprocessor is connected to the optical coupler; the optical coupler is connected to the MOS tube electrically; the MOS tube is connected to the electromagnet.

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