JPH023396B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a power supply device for ships, particularly a generator driven by a propulsion engine of a fishing boat, and converts the output from the generator into a forward conversion circuit and an inverse conversion circuit. In a marine power supply system that supplies a constant frequency alternating voltage by converting it through a circuit, there are cases where the engine speed itself changes significantly, and the engine load and generator load fluctuate greatly. The present invention relates to a marine power supply device that accurately extracts a fault occurrence state from voltage fluctuations caused by the problem.

Conventionally, power supply equipment for ships, particularly fishing boats, has been equipped with a main generator driven by a main engine that drives a propulsion machine, and the rotational speed of the main engine has been subject to large fluctuations due to full speed operation, etc. Taking this into consideration, it is equipped with a relatively small-capacity auxiliary engine and an auxiliary generator driven by it, and during the above-mentioned full speed operation, stable frequency power from the auxiliary generator is used. was. However, as mentioned above, providing an auxiliary engine and an auxiliary generator in addition to the main generator increases the fuel cost as well as the equipment cost.

In order to solve this problem, we focused on the fact that the need to provide an auxiliary generator was due to the frequency fluctuation of the main generator.The output of the main generator was first converted to DC via a forward conversion circuit, and then an inverse conversion circuit. A system in which a constant frequency alternating voltage is generated through a voltage generator has been considered and previously filed by the inventors of the present invention.

Even in such an improved system, the frequency of the alternating voltage is kept constant by, for example, an oscillator, but although the generator itself has a voltage regulation circuit, There remains the problem that the engine speed fluctuates greatly during this period, causing the generator's output voltage to temporarily change significantly.

FIG. 1 conceptually shows how the generator rotational speed (engine rotational speed) and the generator output voltage change in accordance with the operating mode of a fishing boat.

In other words, in response to the start of the engine, the number of revolutions of the generator increases, and an induction motor, for example, is used for loading, etc., and the fishing boat itself starts, speeds up, sails, arrives at the fishing spot, and so on. The output voltage of the generator temporarily fluctuates greatly depending on the operating conditions such as operation, return speed increase, and navigation.

Among such fluctuations in the generator output voltage under non-failure conditions, failures that exceed the adjustment capacity of the voltage adjustment circuit occur, such as when there is a current leakage in the electrical system or during undesired full-speed running as shown in Figure 1. It is necessary to accurately extract and deal with the problems.

For this reason, in the case of the present invention, in consideration of the operating mode as shown in FIG. B. When the output voltage of the generator drops below the voltage that occurs when the engine stops, for example, 120V or less, the gate signal between the forward conversion circuit and the inverse conversion circuit is eliminated. C. The output voltage of the generator is, for example, 200V to 240V.
D. When the output voltage of the generator is within the range shown in Figure 1 (the range shown in Figure 1), it is considered to be in normal operating condition. When the output voltage of the generator is within a range exceeding the range shown in Figure 1, and the condition lasts for more than 2 seconds, it is considered a fault. For example, if the output voltage of the F generator is detected as shown in Figure 1,
If the voltage exceeds 360V, it will be immediately detected as a fault, and we will take appropriate action.

FIG. 2A and FIG. 2B together constitute one figure, and show the configuration of one embodiment of the present invention.

In the figure, numeral 1 is a generator driven by the engine, 2 is a circuit breaker, 3 is a forward conversion circuit, 4 is an inverse conversion circuit, 5 is a load output circuit terminal,
Reference numeral 6 represents a power supply section, 7 a forward conversion control section, and 9 a reverse conversion control section. In addition, G1 to G6 are gates for thyristors (or gate terminals) in the forward conversion circuit,
GA or GF represents a thyristor gate (or gate terminal) in the inverse conversion circuit.

The output voltage from the generator 1 is converted into a DC voltage by a forward conversion voltage 3, and then converted into a constant frequency alternating voltage by an inverse conversion circuit 4, and is supplied to a load. On the other hand, the output voltage of the generator is led to a power supply section 6, and the power supply section 6 is, for example, a constant voltage +
It generates voltages of 6V, ground, and -6V, and supplies power supply voltages to the forward conversion control section 7 and the inverse conversion control section 8.

Although not shown, the forward conversion control unit 7 is supplied with voltages of +6V, ground, and -6V from the power supply unit 6, enters the operating state, and receives signals γ, s, and t for detecting phase rotation. Then, a signal is supplied to the thyristor gates G1 to G6 in the forward conversion circuit.
Further, the inverse conversion control unit 8 is supplied with voltages of +6V, ground, and -6V from the power supply unit 6, and enters the operating state, although details are omitted from illustration, and the inverse conversion circuit thyristor gate GA or Supply signal to GF.

In the power supply section 6, the voltage reduced by the transformer 9 is rectified by the rectification section 10 and guided to the power supply voltage generation unit 11,
+6V regulated by 2, ground, -
6V is generated.

In the inverse conversion control section 8, an oscillator 13,
The timer section 14, the frequency dividing section 15, and the gate amplifier section 16 control the gate GA or GF as described above.
However, in the case of the illustrated embodiment, a voltage abnormality detection section 17 and a reverse phase/open phase control section 18 are also provided to detect an abnormal state in the system and perform breaker trip control. The section 19 is configured to interrupt the circuit breaker 2 described above.

Hereinafter, with reference to the power supply voltage generation unit 11 in the power supply section 6 and the voltage abnormality detection section 17 in the inverse conversion control section 8, it will be explained that the above-mentioned operating modes A) to F) can be obtained.

[] Regarding driving mode A).

There is an operational amplifier 2 in the power supply voltage generation unit 11.
0 is established and the voltage level divided by resistors 21 and 22 is compared with the reference voltage level by resistor 23 and Zener diode 24. And amplifier 2
0 means that the output voltage of the generator is 200V as shown in Figure 1.
The output goes high when the voltage rises to . As a result, the transistor 26 is turned on via the Zener diode 25, the transistor 28 is turned on via the photocoupler 27, and the photocoupler 2
Transistor 30 is turned on via 9. When the transistors 28 and 30 are turned on together, +6V, ground, and -6V regulated by the constant voltage circuit 12 are outputted, and the forward conversion control section 7 and the inverse conversion control section 8 Supplied as the power supply voltage for In other words, the forward conversion control section 7 and the inverse conversion control section 8 generate signals corresponding to the gates G1 to G6 and the gates GA to GF, respectively, and the forward conversion circuit 3 and the inverse conversion circuit 4 start operating, Power supply to the load is started.

[] Regarding driving mode B).

The operational amplifier 20 is provided with a feedback circuit consisting of resistors 31 and 32. As a result, a hysteresis characteristic is given to the characteristics of the operational amplifier 20, and once the output of the amplifier 20 reaches a high level, the output voltage of the generator becomes 120V, for example.
The output of the amplifier 20 is set to a low level only when the voltage drops to below. The state in which the output of the amplifier 20 becomes low level corresponds to the case where the engine that drives the generator stops rotating, and when the output of the amplifier 20 becomes low level, the transistor 2
6 is turned off, then transistors 28 and 30 are turned off, eliminating the output voltage +6V, ground, and -6V. As a result, the operations of the forward conversion circuit 3 and the inverse conversion circuit 4 are stopped, and power supply to the load is stopped. In this case, power is automatically supplied to the load when the output voltage of the generator rises to 200V or higher, as described in [] above, rather than when an abnormal condition occurs.

[] Regarding operating modes C) and D), the above-mentioned power supply voltage generating unit 11 is equipped with a terminal VV for extracting a voltage corresponding to the peak level of the output voltage of the generator. and the terminal
The voltage of VV is monitored by a voltage abnormality detection section 17 as described later. In the operating modes C) and D), the voltage abnormality detection unit 17 does not detect any abnormality, and the voltage is kept as constant as possible by the voltage adjustment function of the voltage adjustment circuit (not shown) provided in the generator 1. I work to keep it that way.

[] Regarding driving mode E).

The voltage of the above-mentioned terminal VV is detected by the voltage abnormality detection section 17.
be taken into the body. The operational amplifier 33 in the voltage abnormality detection section 17 compares the voltage at the terminal VV with a reference level, which is the voltage dividing point of the resistor 34, and changes the output to a high level when the output voltage of the generator decreases to, for example, 180V or less. do. When this high level state is maintained for, for example, two seconds or more, the voltage of the capacitor 35 becomes equal to or higher than a predetermined level. That is, a first voltage or lower time limit detection circuit according to the present invention is configured.

In addition, an operational amplifier 36 is included in the voltage abnormality detection section 17.
is being made. The amplifier 36 includes a resistor 37
The voltage at terminal VV is compared with the reference level, which is the voltage division point of , and when the output voltage of the generator rises to, for example, 255V or higher, the output is set to high level. When this high level state is maintained for, for example, two seconds or more, the voltage of the capacitor 38 becomes equal to or higher than a predetermined level. That is, the second voltage or higher time limit detection circuit according to the present invention is configured.

Voltage of the capacitor 35 or capacitor 3
When the voltage at 8 reaches a predetermined level or higher, the output of operational amplifier 39 becomes high level, causing breaker trip control section 19 to be activated. That is, the above-mentioned circuit breaker 2 is shut off.

[] Regarding driving mode F).

An operational amplifier 40 is provided within the voltage abnormality detection section 17. The amplifier 40 compares the reference level, which is the voltage dividing point of the resistor 41, with the voltage at the terminal VV, and when the output voltage of the generator exceeds, for example, 360V, the output of the amplifier 40 immediately becomes a high level.
The breaker trip control unit 19 is activated to cause the circuit breaker 2 to shut off. That is, the instant detection circuit for the third voltage or higher according to the present invention is configured.

As explained above, according to the present invention, an abnormal state (failure state) can be accurately extracted from an operating mode with severe voltage fluctuations as explained in connection with FIG. Even if the output voltage of the generator decreases to, for example, 120 V or more, the gates G1 to G6, GA to GF will not shut off the circuit breaker, that is, without requiring an artificial reset. The power supply to the load is stopped by stopping the signal supply to the load. Therefore, the occurrence of an abnormal condition can be accurately detected, shut off using a circuit breaker, and the operator notified of the occurrence, while power supply under non-abnormal conditions depends on the output voltage level of the generator. This will be done automatically, making it possible to distinguish between the two.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram illustrating the state in which the rotational speed of the generator and the generator output voltage change depending on the operating mode of the fishing boat, and FIGS. 2A and 2B show the configuration of an embodiment of the present invention. . In the figure, 1 is a generator, 2 is a circuit breaker, 3 is a forward conversion circuit, 4 is an inverse conversion circuit, 5 is a load output circuit terminal,
6 is a power supply section, 7 is a forward conversion control section, 8 is an inverse conversion controller, 11 is a power supply voltage generation unit, 12 is a constant voltage circuit, 17 is a voltage abnormality detection section, and 19 is a breaker.
The peripheral circuit including the trip control unit 33 is a first voltage or lower time detection circuit, the peripheral circuit including 36 is a second voltage or higher time detection circuit, and the peripheral circuit including 40 is a third voltage or lower time detection circuit.
Represents a voltage or higher instant detection circuit.

Claims (1)

[Claims] 1. A generator that is driven by a marine propulsion drive engine and whose output voltage is controlled by a voltage regulation circuit, a forward conversion circuit that rectifies the output voltage from the generator, and an output from the forward conversion circuit. an inverse conversion circuit that obtains a predetermined alternating voltage from the forward conversion circuit; a forward conversion control section that performs control including supplying gate signals to the forward conversion circuit; an inverse conversion control section that performs control including supplying gate signals to the inverse conversion circuit; In a marine power supply device having a power supply unit that generates a power supply voltage for the forward conversion control unit and the inverse conversion control unit, the power supply unit generates a voltage when the output voltage from the generator rises above the power supply operation start voltage. A power supply voltage generation unit that is turned on and turned off when the voltage drops below the voltage corresponding to when the engine is stopped is provided, and the output from the power supply voltage generation unit is made constant voltage to control at least the forward conversion control section and the reverse conversion control section. A voltage monitoring unit is provided, comprising a constant voltage circuit for supplying power to the generator, and monitoring the peak value of the output voltage from the generator, and the voltage monitoring unit is configured to monitor the peak value of the output voltage from the generator. a first voltage or lower time limit detection circuit that detects that the peak value of the output voltage from the generator has continuously decreased to a first voltage value or less;
a second voltage or higher time detection circuit that detects that the peak value of the output voltage from the generator has increased to a second voltage value or higher in a manner that continues beyond a predetermined period; A third voltage detector detects when the peak value of the output voltage reaches a third voltage value or higher.
from the generator when any of the first voltage or lower time detection circuit, the second voltage or higher time detection circuit, or the third voltage or higher immediate detection circuit is operated. A power supply device for a ship, characterized in that a power supply circuit leading to the forward conversion circuit is cut off by a circuit breaker.