JPH0623195Y2 - Inverter control circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inverter (DC / AC converter) control circuit.

[Prior art]

A conventional control circuit of this type is shown in FIG. (Attached Mitsubishi catalog auxiliary power supply for Mitsubishi vehicles) Refer to the signal A-C7224-A P1 circuit diagram. In the figure, (1) is a DC / AC converter, (2) is a DC / AC converter (1 ) Is the capacitor provided on the input side, (3) the coil part of the chopstick and breaker, (3A) the main contact of the chopstick and breaker,
The output end is connected to the anode side of the above capacitor (2),
(4) is the coil part of the charging electromagnetic contactor, (4a) is the contact a of the charging electromagnetic contactor, (5) is the coil part of the discharging electromagnetic contactor,
(5b) is the contact b of the electromagnetic contactor for discharge, (6) is the resistance for charging and discharging, and the contact a of the electromagnetic contactor for charging
A charging circuit is formed by closing (4a), and a discharging circuit is formed by closing the b contact (5b) of the electromagnetic contactor for discharge. (7) is a power supply for applying a predetermined voltage to the coil portion of the above-mentioned breaker, breaker, charging electromagnetic contactor, discharging electromagnetic contactor, (8) is a switch for turning on and off the power supply (7), (9) is an a-contact of the auxiliary relay that closes when the voltage of the capacitor (2) provided on the input side of the DC / AC converter (1) exceeds a predetermined value (hereinafter referred to as the a-contact of the auxiliary relay). (10b) is an auxiliary b contact of the above-mentioned breaker or breaker.

Next, the operation will be described. When the DC / AC converter (1) is operating, the switch (8) is closed so that
By applying a predetermined voltage to the coil portion (4) of the charging electromagnetic contactor by (7), the coil portion (4) of the electromagnetic contactor is excited and the a contact ( 4a) closes and charges the capacitor (2). When the voltage of the capacitor (2) becomes higher than a predetermined voltage, the auxiliary relay a
The contact (9) is closed, a predetermined voltage is applied to the breaker (3), the main contact (3A) of the above breaker is closed, and the auxiliary of the breaker b
The contact (10b) opens, and the coil part (4) of the magnetic contactor for charging
Is de-excited and the contact (4a) of the electromagnetic contactor is opened. On the contrary, when the DC / AC converter (1) is stopped, the switch (8) is opened so that the coil portion (3) of the breaker or the breaker,
The coil part (4) of the charging electromagnetic contactor and the coil part (5) of the discharging electromagnetic contactor are non-excited, and the main contact (3
A) is open, a contact (4a) of the charging magnetic contactor is open, b contact (5b) of the discharging electromagnetic contactor is closed,
(2) is discharged.

The above operation is shown in FIG. 2 as a time chart.

Since the control circuit of the conventional DC / AC breaker of the DC / AC converter and the electromagnetic contactor for discharge is configured as described above, the coil part of the brush / disconnector and the coil part of the charging electromagnetic contactor are configured. However, each of the magnetic contactors for discharge requires a coil, which complicates the control circuit and further increases the cost of the device.

[Outline of device]

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional ones, in which an element having a gate action is connected to one end of the input path of a DC / AC converter, and a DC voltage is applied to the anode side of the element. To provide a control circuit for a DC breaker or breaker and a discharge electromagnetic contactor of the above DC / AC converter in which the breaker and the coil portion of the discharge electromagnetic contactor are shared by connecting the breaker. It is an object.

[Example of device]

An embodiment of the present invention will be described below with reference to the drawings. Third
In the figure, (1) is a DC / AC converter, (2) is a capacitor provided on the input side of the DC / AC converter (1), (30)
Coil part of chopsticks and breakers and electromagnetic contactor for discharge, (3A) main contact of chopsticks and breakers, (40) main contact of above-mentioned chopsticks and breakers on the anode side
(3A) is a thyristor to which one end is connected, and the cathode side is connected to one end of the capacitor (2). (5b) is a contact b of the electromagnetic contactor for discharge, (6) is a resistor for charging and discharging, one end of which is the main contact (3A) of the above-mentioned breaker, the anode side of the thyristor (40), B contact (5b) of electromagnetic contactor for discharge
Is connected to one end of. The main contact (3A) of the wire breaker is closed and the b contact (5b) of the electromagnetic contactor for discharge is opened to form a charging circuit. Conversely, the wire breaker (3A) is opened. The discharge circuit is configured by closing the b contact (5b) of the discharge electromagnetic contactor. (7) is a power source for applying a predetermined voltage to the coil of the above-mentioned breaker and the electromagnetic contactor for discharge,
(8) is a switch that turns on and off the power supply (7).

Next, the operation will be described with reference to the time chart of FIG. When the DC / AC converter (1) is in operation, the switch (8) is closed so that the DC power supply (7) applies a predetermined voltage to the coil part of the disconnector and the electromagnetic contactor for discharge.
By applying to (30), the coil part (3) is excited, the main contact (3A) of the breaker and the circuit breaker are closed, and b of the electromagnetic contactor for discharge is connected.
The contact (5b) is opened, the main contact (3A) of the sushi and circuit breaker, the resistance
The capacitor (2) is charged via (6) and the capacitor
When the voltage of (2) exceeds a predetermined value, the thyristor (40) is fired and the DC / AC converter (1) operates. On the contrary, when the DC / AC converter (1) is stopped, the switch (8) is opened, and the coil section (3a) of the electromagnetic contactor for discharge and electrical discharge is de-excited. And the main contact (3A) of the breaker is open, the b contact (5b) of the charging magnetic contactor is closed, and the resistance
(6) The capacitor (2) is discharged via the b contact (5b).

Although a thyristor is used in the above embodiment, a transistor having a gate function or the like may be used.

[Effect of device]

As described above, according to the present invention, instead of the charging electromagnetic contactor, a control element such as a thyristor is used, and the coil portion of the comb or the breaker and the coil portion of the discharging electromagnetic contactor are made common. There is an effect that a control circuit having a simple structure and inexpensive can be obtained.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a control circuit of a DC / AC converter device, a circuit breaker, and a charging electromagnetic contactor, FIG. 2 is an operation diagram of a conventional circuit, and FIG. 3 is an embodiment of the present invention. Circuit diagram, 4th
The figure is the operation diagram. (1) …… DC / AC converter, (2) …… Capacitor, (3)
…… Shiya breaker coil, (30) …… Shiya breaker and discharge magnetic contactor coil, (3A) …… Shiya breaker main contact,
(4) …… Coil part of charging magnetic contactor, (40) …… Thyristor, (5) …… Coil part of discharging magnetic contactor, (4a) ……
A contact of magnetic contactor for charging, (5b) ... b contact of magnetic contactor for discharging, (6) ... resistance for charging and discharging, (7) ... power supply, (8) ...
... switch, (9) ... a-contact of auxiliary relay, (10b) ... auxiliary-b contact of DC breaker or disconnector In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. A parallel body of a resistor and a control element having a gate control action, which is inserted between at least one input terminal of the inverter and its DC input side, and said inverter on the side of the inverter of the parallel body. A capacitor connected in parallel to the input side of the control means, a control means for conducting the control element when the capacitor voltage is a predetermined value or more, a closed contact connected between the input terminals on the DC input side of the parallel body, and a direct current An open contact on the input side for interrupting DC input, and a drive coil for both closing contact and open contact, provided with a circuit breaker operated by an external signal, and when the circuit breaker is operated, the circuit breaks through the open contact. The DC input current charges the capacitor through the resistance, and when the voltage of the capacitor becomes a predetermined value or more, the control element is turned on and the inverter operates to operate the inverter. If vessel is turned off together with the DC input in the open contact is interrupted, to discharge the electric charge of the capacitor through the said resistor and closed contact, inverter control circuit being characterized in that so as to stop the inverter.