KR100282276B1 - Controller power supply - Google Patents

Abstract

Disclosed is a power supply apparatus for an electronic controller for use in construction heavy equipment and the like.

Such a device includes a power supply of the controller, the controller 300; A power supply unit 302 for generating a DC power of a predetermined size; When the applied first selection signal Cs1 is turned on, the DC power generated from the power supply unit 302 is supplied and connected to the output terminal. When the applied first selection signal Cs1 is turned off, it is generated from the power supply unit 302. A first switching unit 304 for cutting off the DC power; When the applied third selection signal Cs3 is turned on, the DC power output from the first switching unit 304 is connected to the controller 300. When the applied third selection signal Cs3 is turned off, the first selection signal Cs3 is turned off. A second switching unit 306 which cuts off the DC power output from the switching unit 304; When the second selection signal Cs2 applied is turned on, the third selection signal Cs3 applied to the second switching unit 306 is turned off. When the second selection signal Cs2 is turned off, driving is performed. A start motor 308 for stopping and turning on a third selection signal Cs3 applied to the second switching unit 306; And turning on the first selection signal Cs1 applied to the first switching unit 304 and turning on the second selection signal Cs2 applied to the starting motor 308 at startup. And a start switch 310 for turning off the first selection signal Cs1 applied to the first switching unit 304 and turning off the second selection signal Cs2 applied to the starter motor 308.

Description

Electric source apparatus of a controller

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device, and more particularly, to a power supply device for an electronic controller used in construction heavy equipment and the like.

Electronic controllers with built-in microprocessors used in heavy construction equipment powered by engines can operate normally only when the supply voltage is within the allowable range.

If the power supply voltage is out of the allowable range (eg 4.5 V to 5.5 V), the controller will not be able to perform normal operation. If the power supply voltage temporarily changes below the allowable range, the controller may stop executing the program or perform abnormal operation (such as runaway).

1 is a circuit diagram of a power supply device of a controller of the prior art.

The power supply of the controller as shown in Figure 1 is a vehicle power battery 100, the power cut off battery relay 102, the start switch 104, fuse 106, controller 108 and the starting motor 110 It is configured to include.

First, the connection table according to the state of the start switch 104 is as follows.

Terminals B BR C location off ○ driving ○ ○ Start up ○ ○ ○

When the start switch 104 is in the off position, since the power supply of the battery 100 is cut off by the power cut-off battery relay 102, all electric devices do not operate.

When the start switch 104 is placed in the 'start' position to operate the engine, as shown in Table 1, the B terminal, the BR terminal, and the C terminal of the start switch 104 are connected. The starter motor 110 is driven according to the connected state, and the controller 108 starts operation.

2A shows the voltage waveform according to the operating state of the start switch, FIG. 2B shows the voltage waveform of the equipment, and FIG. 2C shows the voltage waveform of the controller 108.

In the case of construction heavy equipment powered by an engine, a starting motor for starting is built in, and a large amount of power is required for driving the starting motor. The power source of the starting motor becomes the battery installed in the equipment, and the battery has a large current flowing when driving a large power load. The internal voltage drop of the battery is proportional to the magnitude of the load current, and the output voltage drops significantly at the start of a large current consumption.

Therefore, the power supply voltage of the controller is also greatly reduced, especially when the engine temperature is high, such as in winter, as the engine oil viscosity increases, the starter motor consumes a larger current, thereby increasing the voltage drop. Batteries that use chemical reactions cause a decrease in voltage as the output decreases as the ambient temperature decreases.

Due to these factors, the power supply voltage of the controller is changed and its value is out of the allowable range. As a result, the controller may be in a state in which normal operation cannot be performed.

Accordingly, an object of the present invention has been made to improve the problems of the prior art as described above, the controller by cutting off the power flowing into the controller while driving the starting motor and connecting the power to the controller in the running state is completed It is to provide a controller power supply that can ensure a stable operation of the controller by excluding the possibility of abnormal operation due to the power supply voltage change of the controller.

Apparatus for achieving the above object is a power supply of the controller, the controller; A power supply unit for generating a DC power of a predetermined size; When the first selection signal Cs1 is turned on, the DC power generated from the power supply unit is supplied to the output terminal, and when the applied first selection signal Cs1 is turned off, the DC power generated from the power supply unit is cut off. 1 switching part; When the applied third selection signal Cs3 is turned on, the DC power output from the first switching unit is connected to the controller. When the applied third selection signal Cs3 is turned off, the direct current output from the first switching unit is turned off. A second switching unit which cuts off power; When the second selection signal Cs2 is turned on, the third selection signal Cs3 applied to the second switching unit is turned off. When the second selection signal Cs2 is turned off, the second selection signal Cs2 is applied to the second switching unit. A starting motor for turning on the three selection signal Cs3; And turning on the first selection signal Cs1 applied to the first switching unit and the second selection signal Cs2 applied to the starting motor at startup, and after the startup is completed, the first selection signal Cs1 applied to the first switching unit. And a start switch for turning off the selection signal Cs1 and the second selection signal Cs2 applied to the start motor.

1 is a circuit diagram of a power supply device of a controller of the prior art.

Figure 2a shows the voltage waveform according to the operating state of the start switch, Figure 2b shows the voltage waveform of the equipment, Figure 2c shows the voltage waveform of the controller.

3 is a configuration diagram of a power supply unit of the controller according to the present invention.

4 is a detailed view of a power supply unit of the controller according to the present invention.

Figure 5a is a voltage waveform diagram in the operating state of the start switch, Figure 5b is a voltage waveform diagram of the equipment, Figure 5c is a power supply voltage waveform diagram of the controller.

* Description of the symbols for the main parts of the drawings *

300: controller 302: power supply

304: first switching unit 306: second switching unit

308: starting motor 310: starting switch

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

3 is a configuration diagram of a power supply unit of the controller according to the present invention.

The power supply of the controller as shown in FIG. 3 includes a power supply unit 300, a controller 302, a first switching unit 304, a second switching unit 306, a starting motor 308, and a starting switch 310. It is configured to include.

The mutual organic relationship according to the components of the power supply of the controller according to the present invention will be described.

The power supply unit 302 generates a DC power of a predetermined size. When the first selection signal Cs1 is turned on, the first switching unit 304 receives DC power generated from the power supply unit 302 and connects to the output terminal. When the first selection signal Cs1 is turned off, the first switching unit 304 is turned off. The DC power generated from the power supply unit 302 is cut off. When the third selection signal Cs3 is turned on, the second switching unit 306 connects the DC power output from the first switching unit 304 to the controller 300, and applies the third selection signal ( When Cs3) is turned off, the DC power output from the first switching unit 304 is cut off. The starting motor 308 is driven when the second selection signal Cs2 is turned on, turns off the third selection signal Cs3 applied to the second switching unit 306, and applies the second selection signal Cs2. Is off, driving stops and the third selection signal Cs3 applied to the second switching unit 306 is turned on. The starting switch 310 turns on the first selection signal Cs1 applied to the first switching unit 304 and turns on the second selection signal Cs2 applied to the starting motor 308 at start-up. In operation, the first selection signal Cs1 applied to the first switching unit 304 is turned off and the second selection signal Cs2 applied to the starter motor 308 is turned off.

Table 2 shows the on / off relationship between the first selection signal Cs1, the second selection signal Cs2, and the third selection signal Cs3.

signal First Selection Signal Cs1 Second selection signal Cs2 Third selection signal Cs3 action stop off off off Start up On On off driving On off On

4 is a detailed view of a power supply unit of the controller according to the present invention.

Reference numerals referenced in FIG. 4 are the same as those in FIG. 3, and thus repeated descriptions thereof will be omitted.

First, the start switch 310 is manually adjusted by the operator by varying the connection state of the switch according to the off time, the start time and the operation time.

Table 3 shows the connection state according to the operating state of the start switch 310.

Terminals B BR C location off ○ driving ○ ○ Start up ○ ○ ○

In other words, in the OFF state, both the B terminal, the BR terminal, and the C terminal of the start switch 310 are separated. At start-up, both the B terminal and the BR terminal, and the B terminal and the C terminal of the start switch 310 are connected. In operation, only the B terminal and the BR terminal of the start switch 310 are connected, and the B terminal and the C terminal are separated.

When the start switch 310 is off, the power supply of the power supply unit 302 is not connected, so the controller 300 does not operate. At start-up, the start switch 310 is connected to the B terminal and the BR terminal, so that a current flows in the coil of the first switching unit 304. Accordingly, the A terminal and the B terminal of the first switching unit 304 are connected to the power supply unit. 302 is powered. On the other hand, since the B terminal and the C terminal of the start switch 310 are connected, a current flows in the coil of the second switching unit 306, so that the A terminal and the C terminal of the second switching unit 306 are connected to the power supply unit 302. DC power generated from the flow is blocked to the controller 300. On the other hand, since the B terminal and the C terminal of the start switch 310 are connected, the DC power of the power supply unit 302 flows into the A terminal of the start motor 308, and the start motor 308 starts to start. Therefore, the DC power of the power supply unit 302 does not flow into the controller 300 while the starting motor 308 is started. When the starting motor 308 completes the starting, the operator switches the switching state of the starting switch 310. As described in Table 3, when the start is completed, only the B terminal and the BR terminal are connected to the connection state of the start switch 310, and the B terminal and the C terminal are disconnected. When the B terminal and the C terminal of the start switch 310 are disconnected, the power flowing into the second switching unit 306 is cut off, so that the A terminal and the B terminal are connected in the connection state of the second switching unit 306. In addition, the starter motor 308 stops the starting operation by cutting off the power supply. Since the current flows in the coil, the first switching unit 304 flows through the DC power supply of the power supply unit 302 to the A terminal of the second switching unit 306 and to the controller 300 via the B terminal.

Therefore, the controller 300 does not receive power at start-up, and operates by receiving power only during operation. Referring to the drawings as follows.

Figure 5a is a voltage waveform diagram in the operating state of the start switch, Figure 5b is a voltage waveform diagram of the equipment, Figure 5c is a power supply voltage waveform diagram of the controller.

Therefore, since the power is cut off at the time of starting the controller 300 and power is supplied only during the operation, the problem caused by the power is introduced into the controller 300 even at the time of the conventional starting.

According to the power supply device of the controller as described above, it is possible to eliminate the possibility of failure due to the stabilization of the controller operation and the complicated circuit configuration, and to provide a low cost in terms of cost.

Claims (1)

In the power supply of the controller, Controller 300; A power supply unit 302 for generating a DC power of a predetermined size; When the applied first selection signal Cs1 is turned on, the DC power generated from the power supply unit 302 is supplied and connected to the output terminal. When the applied first selection signal Cs1 is turned off, it is generated from the power supply unit 302. A first switching unit 304 for cutting off the DC power; When the applied third selection signal Cs3 is turned on, the DC power output from the first switching unit 304 is connected to the controller 300. When the applied third selection signal Cs3 is turned off, the first selection signal Cs3 is turned off. A second switching unit 306 which cuts off the DC power output from the switching unit 304; When the second selection signal Cs2 is turned on, the third selection signal Cs3 applied to the second switching unit 306 is turned off. When the second selection signal Cs2 is turned off, the second switching signal Cs2 is turned off. A start motor 308 for turning on the third selection signal Cs3 applied to the unit 306; And At startup, the first selection signal Cs1 applied to the first switching unit 304 and the second selection signal Cs2 applied to the starting motor 308 are turned on, and after the startup is completed, the first selection signal Cs1 is turned on. And a start switch (310) for turning off the first selection signal (Cs1) applied to the switching unit (304) and the second selection signal (Cs2) applied to the starting motor (308).