JPS6155682B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a power-on starting method for starting the power supply of, for example, electronic equipment, and more specifically, a power-on starting method using a switch configured with an electronic circuit such as a Hall element. This is related to ensuring safety by preventing accidental start-up due to switch failure.

Conventionally, power-on switches built into electronic equipment such as computers have often been mechanical contact type switches, but keyboard switches used in electronic computers have recently changed to capacitor couple type switches, or electronic circuit switches using piezoelectric elements or Hall elements. has become popular, and the power-on switches placed here are also unified in terms of parts used and implementation.
Electronic circuit switches are used due to cost issues and other reasons.

On the other hand, users of electronic devices such as computers are increasingly operating their electronic devices unmanned in order to save labor, and fail-safe designs are increasingly required.

Electronic circuit switches used in such situations are susceptible to short-circuit mode failures, which conventional mechanical contact type switches do not have (short-circuits due to mechanical contact failures are considered to be extremely rare), and are especially If a power-on switch in an electronic device that is operated in an unattended state fails in short-circuit mode while the electronic device is in a stopped state, it is equivalent to a switch turning on, and the electronic device starts operating in an unattended state. There was a drawback that caused a serious inconvenience.

FIG. 1 is a circuit configuration diagram showing an example of a conventional power-on startup method. In the figure, the power-on switch 1 is composed of an electronic circuit using a piezoelectric element H, and is supplied with power from the power supply Vcc of the power control unit 7. When pressure is applied to element H, conduction occurs between the collector and emitter of transistor 2. Furthermore, when a switch (not shown) is stopped being pressed and pressure is no longer applied to the piezoelectric element H, the conduction between the collector and emitter of the transistor 2 is released.

The power control section 7 is provided with a relay ON1 that is impressed when conduction occurs between the collector and emitter of the transistor 2 of the power-on switch 1, and the contact ON (1-1) of the relay ON1 is connected to the collector of the transistor 2 of the power-on switch 1. Once conduction occurs between the emitters and relay ON1 is touched, it is wired in such a way that it self-maintains. Relay contact ON (1-2) is a contact that issues a start command to a power-on sequence mechanism (not shown).

Figure 2 is a timing diagram showing the circuit operation of Figure 1. When the power-on switch (not shown) is turned on, transistor 2 is turned on, and the relay is turned on.
1 was impressed and the relay contact turned on (1-1) and
This shows that on(1-2) is closed. When relay contact ON (1-1) is closed, relay ON1
relay contact is on even if transistor 2 is off
(1-1) continues to impress me. Also, by keeping the relay contact ON (1-2) closed,
Power-on is continued by continuing to issue a startup command to a power-on sequence mechanism (not shown).

When an electronic device equipped with a power-on mechanism having such a configuration is in a stopped state, if for some reason the transistor 2 of the power-on switch 1 is short-circuited and conducts between the collector and emitter, an unintended However, it had the disadvantage that the power would turn on automatically, which could lead to serious failures in unmanned operation.

The purpose of this invention is to eliminate the problems of the prior art as described above, and to ensure the safety of electronic equipment without automatically issuing a startup command even if the transistor of the power-on switch fails due to a short circuit. It is an object of the present invention to provide a power-on startup method having the following effects.

The feature of this invention is that as a condition for issuing a start command to the power-on sequence mechanism, it is necessary to turn on the transistor of the power-on switch and then turn it back off. By configuring the power-on switch to output , even if the power-on switch transistor fails and conduction occurs between the collector and emitter, no activation command will be issued to the power-on sequence mechanism.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 3 is a circuit diagram showing a circuit configuration of a power-on startup system according to an embodiment of the present invention.

In the figure, a power-on switch 1 is a semiconductor switch composed of a piezoelectric element (or Hall element) H, etc., and is turned on when a transistor 2 is conductive, and turned off when it is non-conductive. The power-on switch receiving section 3 includes a relay K1 that is touched when the transistor 2 is turned on, a contact k (1-1) of the relay K1 for self-holding of the relay K1, and a diode D1 for preventing current leakage. It constitutes a holding mechanism 4. On the other hand, when transistor 2 is off, the relay K2 is moved through resistor R1, and when transistor 2 is on, it is inverted to non-sensing.
and a reverse motion mechanism 5 configured with a current loop prevention diode D2, and a self-holding mechanism 4.
An AND circuit 6 is provided in which the other contact k (1-2) of the relay K1 and the contact k (2-1) of the relay K2 of the reverse impression mechanism 5 are connected in series. The same circuit as the power-on control section 7 shown in the conventional example shown in FIG. 1 is connected to the rear stage of the power-on switch receiving section 3. However, on the break contact side of the contact ON (1-1) of the relay ON1 of the power-on control section 7, there is a drive current flowing through the power-on switch 1 and the contact k (1-1) of the relay K1 of the self-holding mechanism 4, and a reverse voltage. It is connected so that a current for pulling out the moving current of the relay K2 of the mechanism 5 is passed through the transistor 2.

FIG. 4 shows the circuit operation of FIG. 3 in a timing diagram.

Next, the operation of the circuit diagram in FIG. 3 will be explained. In the off state, when the power supply Vcc rises and the circuit system shown in Figure 3 becomes live, current flows through the route of resistor R1 and relay K2, relay K2 is touched, and relay contact k (2-1) becomes a closed circuit. When power-on switch 1 is turned on in this state, transistor 2 is turned on, relay K1 is moved through relay K1, diode D1, transistor 2, relay contact on (1-1) break contact, and relay contact k (1
-1) and k(1-2) are closed. Furthermore, when transistor 2 is turned on, most of the current that was flowing from resistor R1 through relay K2 flows in the direction of resistor R1, diode D2, and transistor 2, so relay K2 is inverted in a neutral manner. Since the contact k (2-1) is opened, the relay contact k (1-2) of the AND circuit 6 is closed, and the relay contact k (2-1) is reversed to open, and the relay of the power control section 7 is reversed. ON1 is still in an unimpressed state. When the power-on switch 1 is turned off, the transistor 2 is turned off and the reverse motion mechanism 5 is turned off.
The current flowing through the resistor R1, the diode D2, and the transistor 2 of the power-on switch 1 is cut off, and the relay K2 of the reverse motion mechanism 5 is connected to the resistor R1.
1 flows, the relay contact k (2-1) of the AND circuit 6 is closed. On the other hand, the relay contact k(1-2) is self-held when the relay K1 of the self-holding mechanism 4 is closed, so the relay contact k(1-2) of the AND circuit 6 is self-held. -2) and k (2-1) contacts are both closed, a start command is sent to the power control section 7 as an output of the power-on switch receiving section 3, and the relay ON1 of the power control section 7 is activated.

When relay ON1 is touched, relay contact turns on (1
-1) and on (1-2) are closed and the relay contact
on (1-1) performs self-holding of relay ON1.
Further, since the break contact of the relay contact ON (1-1) is opened, the relay K1 of the self-holding mechanism 4 of the power-on switch receiving section 3 is restored. Relay K1
Due to the restoration of , relay contact k (1-
2) is opened, but the relay ON1 of the power-on control unit 7 is self-held by the relay contact ON (1-1), so it does not recover. As a result, the relay contact ON (1-2) continues to be closed, continues to send a start signal to a power-on sequence section (not shown), and powers on the electronic device.

With the configuration as described above, the following effects can be obtained in the present invention.

Even if the power-on switch, which is made up of an electronic circuit, malfunctions and the transistor becomes conductive, the AND circuit conditions will not hold, so the power will not turn on, ensuring safety even in unmanned operation. be done.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing the circuit configuration of a conventional power-on starting method, Fig. 2 is a timing diagram showing the circuit operation of Fig. 1, and Fig. 3 is a circuit diagram showing the circuit configuration of a conventional power-on starting method. A circuit diagram showing the circuit configuration,
FIG. 4 is a timing diagram showing the circuit operation of FIG. 3. Code explanation, 1... Power on switch, 2...
Transistor, 3... Power-on switch receiver, 4... Self-holding mechanism, 5... Reverse impression mechanism, 6
...Logic product circuit, 7...Power-on control section.

Claims (1)

[Claims] 1. A switch that becomes conductive when an ON command is input and returns to a non-conductive state when the ON command is released; a first relay that operates due to the conduction of the switch and self-maintains its operating state; When the second relay, which was previously in the operating state due to conduction of the switch, returns to the operating state and becomes the operating state again due to the non-conduction of the switch, and the first relay and the second relay are both in the operating state. and a third relay that operates and self-maintains, and after inputting an ON command to the switch to make it conductive, the third relay operates by releasing the ON command and returning to the non-conducting state. A power-on starting method characterized in that power-on starting is applied by the operation of a relay.