JPS62264530A - Driving circuit for single winding latching type electromagnetic relay - 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 [Field of Industrial Application] The present invention relates to a drive circuit for a single-winding latching type electromagnetic relay.

[Conventional technology]

Conventionally, the drive circuit for this type of latching type electromagnetic relay has been constructed by switching the direction of the current flowing through the excitation coil of the relay using a plurality of transfer relays or semiconductor switching elements with equivalent functions. closing and opening.

Referring to FIG. 4, the drive circuit of the single-winding latching type electromagnetic relay 101 using a relay connects winding portions 1021 and 1031 and contact portions 1022 and 1032 to two transfer type relays 102 and 103 for driving. power supply 10
4. The contact portions 1022 and 1032
The winding portion 1011 of the relay 101 is connected between the common terminals of the relay 101 . When no control signal is input to the winding portions 1021 and 1031, that is, when the relays 102 and 103 are not in the driving state, the contact portions 1022 and 1032 maintain a solid state, and the winding portion 101 A current flows in the direction of arrow C, and the relay 10
The contact portion 1012 of No. 1 is open (solid line state). When a control signal is input to the winding portions 1021 and 1031, the relays 102 and 103 are brought into a driving state υ, and the contact portions 1022 and 1032 are respectively switched to the broken line state. A current flows through the winding portion 101 in the direction of the arrow, and the contact portion 1012 is switched to a closed state (broken line state).

Further, referring to FIG. 5, the drive circuit of the single-winding latching type electromagnetic relay 101 using semiconductor switching elements is composed of four NPN transistors 104 to 107. The transistor 104 is controlled by the control signals C1 to C4.
107 are turned on, off, off, and on, respectively, a current flows in the winding portion 1011 of the relay 101 in the direction of arrow C, and the contact portion 1012 is opened. On the contrary, the transistor 1 is controlled by the control signals 01 to C4.
When 04 to 107 turn off, on, on, and off, respectively, a current flows through the winding portion 1011 in the direction of the arrow, and the contact portion 1012 closes.

[Problem that the invention seeks to solve]

However, in the conventional drive circuit shown in FIG. 4, the transfer type relay 102 and 1
Since the operation speed of the electromagnetic relay 101 is slow, the electromagnetic relay 101 cannot be driven at high speed, and the power consumption for driving is large.

On the other hand, the circuit shown in FIG. 5 in which a semiconductor switching element such as a transistor is used as a replacement for a transfer type relay has the problem that the number of switching elements increases and the control circuit becomes complicated.

[Failure to solve the problem]

The present invention provides a drive circuit for a single-winding latching type electromagnetic relay that includes a winding section and a contact section that switches contacts in response to the direction of a current applied to the winding section. a capacitor connected in series; a charging circuit having a normally open switching element that closes an electric circuit in response to an external control signal and a power supply, and connected to the capacitor and the winding portion; comprising a normally closed switching element that opens the electric circuit in response to the control signal;
A discharge circuit connected to the capacitor and the winding portion.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

Referring to FIG. 1(a), one embodiment of the present invention includes a normally closed switching element 5 and a normally open switching element 6 connected in series between terminals 1 and 2, and a normally closed switching element 5 and a normally open switching element 6. A capacitor 7 connected between the connection point of the switch 6 and the terminal 3, a control input terminal 4 into which a control signal for controlling the switching state of the switching elements 5 and 6 is inputted, and a control input terminal 44-→the terminal 1 and a power supply 8 to which a negative 9111 (ground side) terminal and a positive terminal are connected to the terminal 3 and the power supply 8, respectively.
A single-winding latching type electromagnetic relay 9 is provided with a winding portion 91 connected between the negative terminal and the negative terminal of the single-winding latching type electromagnetic relay 9. The contact portion 92 of the relay 9 is closed when a current is applied to the winding portion 91 in the direction of arrow A, and once closed, it remains closed until a current is applied in the direction of arrow B and the contact portion 92 is opened. Retain state. Similarly, after opening in response to the application of current in the direction of arrow B,
The open state is maintained until a current is applied in the direction of arrow A. 1st
Referring also to Figure (b), when a control signal is input from the terminal 4 (on state), the normally open switching element 6 is closed and at the same time the normally closed switching element 7 is closed. The charging current 1 (in the direction of arrow A) flows from the power source 8 through the capacitor 7 to the winding section 91 of the relay 90, and the contact section 9 of the relay 9 is opened.
2 is closed and the capacitor 7 is charged.

Subsequently, when the control signal is disconnected (off state), the switching element 6 is opened and the switching element 5 is closed, so that the switching element 5 and the winding portion 91 are removed from the capacitor 7 in the charged state. Through this, the discharge current 2 flows in the direction of arrow B, and the contact portion 92 is opened (restored).

Referring to FIG. 2, in the first specific circuit example of the embodiment shown in FIG. 1(a), the switching element 5
and 6, a light emitting diode 101 and an MO8 type transistor 5 whose operation is controlled by this diode 101.
1 (normally closed) and 61 (normally off), a transfer contact type VMO8 solid state relay 10 is used. One terminal of this solid state relay 10 is connected to a power supply (+5V) via a resistor 46.
), and the other terminal is connected to the control terminal 4 via a NOT gate 41. When the control signal C0NT is at a high level in the digital circuit, the diode 101
emits light and the switching elements 51 and 61 are turned off and on, respectively. A charging current 1 flows from the power source 8 to the winding portion 91 through the capacitor 7,
The contact portion 92 of the relay 9 is closed. Next, when the control signal C0NT becomes low level in the digital circuit, the diode 101 is turned off and the switching elements 51 and 61 are turned on and off, respectively.

Discharged electricity aI2 flows from the capacitor 7 in the charged state to the winding portion 91 through the switching element 51, and the contact portion 92 of the relay 9 opens. By employing the optically coupled solid state relay in this manner, the control system of the switching elements 51 and 61 and the drive system of the relay 9 can be electrically isolated.

Next, referring to FIG. 3, the second specific circuit example of this embodiment uses NPN transistors 52 and 62 as the switching elements 5 and 6. The base of this transistor 520 is connected to the base of the control NPN transistor 42 and the collector of the control NPN transistor 43, and is connected to a voltage via the resistor 44.
Connected to l@V. The base of the transistor 62 is connected to the collector of the transistor 42, and the '' is connected to the source V via a resistor 45. The emitters of the transistors 42 and 43 are each grounded, and the base of the transistor 43 receives a control signal C0NT. When the control signal C0NT is at a high level, the transistor 43 is turned on and the transistors 42 and 52 are turned off. Furthermore, since the transistor 62 is turned on in response to the turning off of the transistor 42, the charging current 1 flows from the power supply 8 to the winding portion 91, and the contact portion 92 is closed. On the other hand, when the control signal C0NT becomes low level, the transistors 43, 52, 42 and 62 are turned off, turned on, and
turns on and off. The discharge current 2 flows from the capacitor 7 to the winding portion 91, and the contact portion 92 is opened (restored). In this circuit example, since transistors are used as the switching elements 5 and 6, the cost is lower than that of the circuit shown in FIG. In addition, the transistors 52 and 62 may both be PNP transistors, or one may be NPN and the other may be PNP,
Alternatively, it may be a MOS type. Further, other switching elements such as a thyristor may be used in place of the transistor. Further, from the control input terminal 4 to the terminals 1 to 1,
Up to 3 may be integrated.

Note that in the block of FIG. 1(a), the relay 9
Winding portion 91. The polarities of capacitor 7 and power supply 8 may be completely reversed.

Further, the contact portion 96 may have a structure having two fixed side contacts.

〔Effect of the invention〕

As explained above, the present invention forms a charging/discharging circuit with a normally open switching element, a normally closed switching element, and a capacitor, and applies current to the winding portion of the relay, thereby achieving single winding latching. The present invention has the advantage that the type relay can be driven at high speed with low power consumption, and furthermore, drive control can be achieved with a simple control circuit. Further, since it can be directly connected to a digital logic device such as a TTLIC, there is also the effect that driving a single-winding base latching relay is facilitated.

[Brief explanation of drawings]

FIGS. 1(a) and (b) are a block diagram and an operation explanatory diagram of an embodiment of the present invention, respectively, and FIGS. 2 and 3 are specific circuit examples of the block diagram shown in FIG. 1 (at K). The circuit diagrams shown in FIGS. 4 and 5 are circuit diagrams showing drive circuits of conventional single-winding latching type electromagnetic relays. 1.2.3...terminals, 4... - Control input terminal, 5... Normally closed molded switching element, 6... Normally open type switching element, 7.
... Capacitor, 8 ... Power supply, 9 ...
...Single winding latching type electromagnetic relay, 91...
・Winding part, 92...Contact part. Chrysanthemum 2 figure 3 muscle figure 4 @ source; Figure 5

Claims (1)

[Scope of Claims] In a drive circuit for a single-winding latching type electromagnetic relay comprising a winding portion and a contact portion that switches a contact in response to the direction of a current applied to the winding portion, the winding portion a capacitor connected in series to the capacitor; and a charging circuit having a normally open switching element that closes an electric circuit in response to an external control signal and a power source, and connected to the capacitor and the winding section. and; a normally closed switching element that opens an electric circuit in response to the control signal, and a discharging circuit connected to the capacitor and the winding portion. Drive circuit for wire latching type electromagnetic relay.