JPS61218024A - Relay power source compensation system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] When the voltage of the solar cell used as a power source at a flood defense telemeter observation station, etc. drops below the touching voltage of the relay, this is detected and the voltage value is changed only when touching the relay. By making the voltage higher than the impressed voltage value, it is possible to compensate the relay power supply at low cost using a single voltage power supply.

[Industrial application field]

The present invention relates to an improvement in a relay power supply compensation system when the voltage of a solar cell used as a power source decreases in a flood defense telemeter observation station or the like.

When using solar cells, the voltage may drop at night or due to weather. In this case, the electronic circuit and the relay are normally operated at the same voltage (for example, 12V), but the minimum operating voltage of the relay is higher than the minimum operating voltage of the electronic circuit.

Therefore, even if the power supply voltage drops below the minimum operating voltage of the relay, the electronic circuit will still operate, so it is necessary to compensate the relay so that it operates.

In this case, it is desired to be able to compensate using an inexpensive method.

When using the relay in a holding state, once it is impressed, a voltage of about 60% of the rating is enough to hold it, and the delay time when the relay operates and when it recovers is l m s - The IQ is about ms, so instantaneous power outages are not a problem.

[Problems to be solved by conventional technology and the invention] Conventional relay power supply compensation systems consider power supply voltage drop separately from those for electronic circuits, and use power supply boards for relays that normally supply high voltage. Alternatively, a method is used in which the output is divided into voltages using a single high-voltage power supply, and the output is passed through a stabilizing circuit according to the circuit voltage, so that even if the voltage drops, the specified voltage is supplied. In any case, there is a problem that it is expensive.

[Means for solving problems]

The above problem is solved by the relay power supply compensation method of the present invention, which detects when the power supply voltage is lower than the sensing voltage of the relay, and increases the voltage value higher than the sensing voltage value only when sensing the relay. Ru.

[Effect]

According to the present invention, when the power supply voltage is lower than the relay's sensing voltage, this is detected by the relay sensing minimum voltage detection circuit, and only when the relay is sensing, the voltage is Since the value is set to be higher than the sensing voltage value, all that is required is a relay sensing minimum voltage detection circuit and, for example, a small-capacity step-up DC-DC converter that operates on the power supply voltage, making the relay power supply compensation method inexpensive. I can do it.

〔Example〕

FIG. 1 is a block diagram of a relay power supply compensation circuit according to an embodiment of the present invention, and FIG. 2 is a time chart of each part of the circuit of FIG.

In the figure, 1 is a relay power supply compensation circuit, 2 is a step-up DC/DC converter, 3 is a relay minimum voltage detection circuit, 4 is a pulse generator, 5 is a NOR circuit, 6 is an AND circuit, 7 is a NOT circuit, 10 to 12 indicates a relay, and Trl and Tr2 indicate transistors.

To explain the operation, when the power supply voltage shown in FIGS. 2(A) and 2(b) is the normal voltage V, the transistor Tri is off and Tr2 is on, and the power supply to the relays 10 to 12 is A voltage V is applied via the transistor Tr2.

The step-up DC-DC converter 2 is connected to a power supply voltage (for example, V
), and as shown in FIG. 2(A)(a), even if there is a fluctuation in the power supply voltage, a voltage value v2 sufficient for relay action is supplied.

In a normal case, when a pulse for operating the relay IO is inputted, for example, as shown in A in FIG. 2(B), the relay 10 is operated at the power supply voltage 2, and if holding is required, it is held at the voltage V.

Next, as shown in FIGS. 2(A) and 2(b), the power supply voltage V is
Lower the relay's minimum voltage v1 (see Figure 2 (A)).
c) Above the limit voltage v4 which cannot hold the relay] Voltage v3
, the relay sensing minimum voltage detection circuit 3 detects this and outputs the level to the AND circuit 6.

At this time, for example, a relay 10 as shown at the opening in FIG.
When a pulse is input to operate the
As shown in Fig. 2(E), a Lebel pulse is emitted for a time long enough to turn on the relay (for example, 50m5), and during this Lebel pulse period, as shown in Fig. 2(E) (the transistor Tri is turned on, this pulse is passed to the NOT circuit). Reversed at 7,
In addition to the transistor Tr2, the transistor Tr2 is turned off as shown in FIG. 2 (D>).

As a result, as shown in FIG. 2(F), the voltage supplied to the relays 10 to 12 is increased from the step-up DC-DC converter 2 to the lowest relay voltage while the pulse generator 4 is emitting the Lebel pulse. (2) A voltage v2 higher than 1 is supplied.

Therefore, relay 10 is impressive. When the pulse of this pulse generator 4 reaches 0 level, the transistor Tri is turned off and Tr2 is turned on, and the relays 10 to 1
2 is supplied with a voltage 3 which is lower than the relay sensing minimum voltage v1, but this is sufficient to hold the relay, so if it is necessary to hold the relay, it will be held.

Note that if the pulse width of the pulse that operates the relay is sufficient to operate the relay (for example, 50 ms or more), the pulse generator 4 is not necessary.

By doing this, if the power supply voltage drops,
To compensate for the relay power supply, a simple step-up DC- Compensation can be achieved with an inexpensive relay power supply compensation circuit 1 that uses a DC converter 2 and a relay sensing minimum voltage detection circuit 3.

〔Effect of the invention〕

As explained in detail above, according to the present invention, the power supply voltage is
If the voltage drops below the relay's voltage, the relay's voltage will be lowered.
There is an effect that can be compensated by a cheap method.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a relay power supply compensation circuit according to an embodiment of the present invention, and FIG. 2 is a time chart of each part of the circuit of FIG. 1. In the figure, 1 is a relay power supply compensation circuit, 2 is a step-up DC-DC converter, 3 is a relay sensing minimum voltage detection circuit, 4 is a pulse generator, 5 is a NOR circuit, 6 is an AND circuit, 7 is a NOT circuit, IO ~ 12 is a relay, and Trl and Tr2 are transistors.

Claims (1)

[Claims of Claims] A relay power supply compensation system characterized in that when the power supply voltage falls below the sensing voltage of the relay, this is detected and the voltage value is made higher than the sensing voltage value only when the relay is to be moved. .