KR930004303Y1 - Electronic circuit driver - Google Patents

Abstract

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Description

Operation drive circuit of electronic circuit

The accompanying drawings are operation driving circuit diagram of the electronic circuit of the present invention.

* Explanation of symbols for main parts of the drawings

11: operation driving circuit 12: bias circuit

13: main circuit Q1, Q2: PNP transistor

Q3: Field Effect Transistor (FET) I: Current Source

The present invention relates to an operation driving circuit of an electronic circuit, and more particularly, to an operation driving circuit of an electronic circuit adapted to operate an integrated circuit.

In general, if the power is directly applied to the main circuit during initial power supply for operation driving in electronic circuits such as integrated circuits, it is not supplied to each part of the main circuit sequentially, which may result in instantaneous overcurrent or instantaneous pulse, resulting in unstable operation of the system. Is generated. As a result, complex and expensive circuits such as surge or protection circuits must be built into the power supply.

In order to solve such a conventional problem, the present invention is applied to sequentially apply the bias of the primary operation circuit of the main circuit when the power is supplied for the operation of the main circuit so as to prevent malfunction and destruction of the main circuit. -up) to devise a circuit, it will be described in detail with reference to the accompanying drawings as follows.

The accompanying drawings are an operation driving circuit diagram of the electronic circuit according to the present invention, and as shown therein, a power supply voltage Vcc supplied to the bias circuit 12 and the main circuit 13 is supplied to the emitter through the resistor R1. The applied PNP transistors Q1 and Q2 connect the collector to the current source I in common, and the power supply voltage Vcc is connected through the diodes D1 to D3 and then the base of the PNP transistor Q1. And a drain connected to the field effect transistor Q3, and a base of the PNP transistor Q2 is commonly connected to the bias circuit 12 and the main circuit 13 to form an operation driver circuit 11.

Referring to the operation and effects of the present invention configured as described above are as follows.

First, when the power supply voltage Vcc is supplied, the bias circuit 12 and the main circuit 13 do not operate, but the operation drive circuit 11 operates.

That is, the diodes D1 through D3 are supplied to the base of the PNP transistor Q1 and the field effect transistor Q3, and the base voltage of the PNP transistor Q1 becomes Vcc-3V _BE = V _BE . When the base voltage of the PNP transistor Q1 is determined and turned on, the current source I is operated, and the PNP transistor Q2 is turned on by the operation of the current source I. The bias circuit 12 is operated by the turn-on of the PNP transistor Q2 and the main circuit 13 is operated.

At this time, the bias voltage of the main circuit 13 is determined by Vcc-R1I-V _BE , _Q2 and the bias circuit 12. When the main circuit 13 operates, the PNP transistor Q1 is turned off, which is designed to make the base voltage of the PNP transistor Q2 lower than the base voltage of the PNP transistor Q1 (V _BE , _Q1 ). V _BE , _Q2 ). That is, the painter P transistor (Q1), (Q2) that is the base potential of the P & P transistor (Q2) initially equal to the blood base voltage (V _{B, Q1)} of the & P transistor (Q1) a bias circuit (12 when both turn-on ) And the main circuit 13, the base potential (V _BE , _Q2 ) of the PNP transistor _Q2 is lower than the base potential (V _BE , _Q1 ) of the PNP transistor Q1 (V _BE , _Q1 > V _BE , _Q2 ). Then, the current flows almost through the PNP transistor Q2, so the PNP transistor Q1 is turned off. In addition, the voltage Vcc is sequentially applied through the diodes D1, D2, and D3, and then applied to the field effect transistor Q3 in which the gate and source used in place of the resistor are grounded, thereby changing the power supply voltage Vcc. The current change flowing through the field effect transistor Q3 can be minimized, and the lower limit R1 is designed to allow the optimal current to flow through the P and C transistors Q1 and Q2. In order to stabilize the base voltage, the bias circuit 12 serves as a circuit capable of starting-up while thermally securing the main circuit 13 by designing a high-stable circuit for heat.

In this way, the present invention is composed of a simple circuit for driving the main circuit 13, the power loss is low by designing the current of the operation driving circuit to a minimum, and using the field effect transistor (Q3) according to the change of the power supply voltage The gate-source was designed to minimize the source-drain current change.

As described above, the present invention is designed to configure the operation driver circuit of the main circuit with a simple circuit configuration, and to minimize the current of the operation driver circuit, starting from the primary operation circuit bias of the main circuit when supplying the power voltage (Vcc). By applying sequentially, it is possible to prevent the malfunction and destruction of the main circuit, there is an effect that can improve the life and reliability of the system incorporating the circuit of the present invention.

Claims (1)

The collectors of the PNP transistors Q1 and Q2, which are commonly applied to the emitter via the resistor R1, with the power supply voltage Vcc supplied to the main circuit 13 and the bias circuit 12 to the current source I. Common connection, the power supply voltage Vcc is connected to the base of the PNP transistor Q1 through diodes D1-D3, and the source is connected to the drain of the field effect transistor Q3 grounded; An operation circuit for an electronic circuit, comprising: a base of a PNP transistor (Q2) connected to the bias circuit (12) and a main circuit (13).