CN103792983A - Current adjustable and limitable circuit with sudden stop and slow starting functions - Google Patents

Abstract

The invention discloses an adjustable and limitable current circuit with functions of emergency stop and slow start, which includes a slow start circuit with emergency stop function, and the slow start circuit with emergency stop function is connected with a current regulation circuit with voltage stabilization , the current regulating circuit with voltage stabilization is connected to an amplifying circuit, the amplifying circuit is connected to a circuit limiting circuit, and the circuit limiting circuit is connected to a follower circuit. The invention has simple structure, less components and parts, no external interference, and high temperature control precision. It can be widely used in various current controllable circuits.

Description

A current adjustable and limitable circuit with emergency stop and slow start function

technical field

The invention relates to an adjustable and limitable current circuit, in particular to an adjustable and limitable current circuit with emergency stop and slow start functions.

Background technique

Current controllable circuits are widely used in electronics, communications, medical and other fields, but in the existing current controllable circuits, the structure is generally complex, the components used are more, the functions are less, and the controlled object and the outside world are greatly disturbed. .

The purpose of the present invention is to overcome the above problems existing in the prior art, and to provide an adjustable current limiter with emergency stop and slow start functions, which has a simple structure, uses fewer components, has no external interference, and has high temperature control accuracy. circuit.

In order to achieve the above-mentioned technical purpose and achieve the above-mentioned technical effect, the present invention is realized through the following technical solutions:

An adjustable and limitable current circuit with emergency stop and slow start function, including a slow start circuit with emergency stop function, the slow start circuit with emergency stop function is connected with a current regulation circuit with voltage stabilization, and the A regulated current regulating circuit is connected to an amplifying circuit, which is connected to a circuit limiting circuit, which is connected to a follower circuit.

The slow start circuit with emergency stop function includes a trigger U1, the RST terminal of the trigger U1 is connected to the switch SW1, the CV terminal of the trigger U1 is grounded through the capacitor C1, and the THR terminal of the trigger U1 is connected in parallel After the TRG terminal is grounded through the resistor R2, the output terminal of the trigger U1 is connected in parallel with the voltage regulator tube U2 and the resistor R4 of the current regulating circuit with voltage stabilization, and the resistor R4 is connected to the comparison of the amplifying circuit through the sliding rheostat R5 The non-inverting input of device U3.

The inverting input terminal of the comparator U3 is connected in parallel with the capacitor C4 and the resistor R7 to the resistor R8 of the circuit limiting circuit, the output terminal of the comparator U3 is connected to the resistor R8, and the resistor R8 is connected in parallel with the capacitor C3, the sliding rheostat R6 and the resistor R8. The non-inverting input terminal of the comparator U4 of the follower circuit, the inverting input terminal of the comparator U4 is connected to the resistor R9 and the resistor R10 and grounded.

The amplifying circuit is connected to the current limiting circuit at a point Vo.

The beneficial effects of the present invention are:

The invention has simple structure, less components and parts, no external interference, and high temperature control precision.

Description of drawings

Figure 1 Overall framework diagram;

Figure 2. Schematic diagram.

Explanation of symbols in Fig. 2: 1. Slow start circuit with emergency stop function, 2. Current regulation circuit with voltage stabilization, 3. Amplifying circuit, 4. Current limiting circuit, 5. Follower circuit.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

Referring to Figures 1 and 2, a current adjustable and limitable circuit with emergency stop and slow start function includes a slow start circuit 1 with emergency stop function, and the slow start circuit 1 with emergency stop function is connected with a stable The voltage-regulated current regulation circuit 2 is connected to the amplifying circuit 3 , the amplifying circuit 3 is connected to the circuit limiting circuit 4 , and the circuit limiting circuit 4 is connected to the following circuit 5 .

Further, the slow start circuit 1 with emergency stop function includes a trigger U1, the RST terminal of the trigger U1 is connected to the switch SW1, the CV terminal of the trigger U1 is grounded through the capacitor C1, and the trigger U1 The THR end of the TRG end is connected in parallel to the TRG end and grounded through the resistor R2, the output end of the trigger U1 is connected in parallel with the voltage regulator tube U2 and the resistor R4 of the current regulation circuit 2 with voltage regulation, and the resistor R4 is connected to the resistor R4 through the sliding rheostat R5. The non-inverting input terminal of the comparator U3 of the amplifying circuit 3.

Further, the inverting input terminal of the comparator U3 is connected in parallel with the capacitor C4 and the resistor R7 and then connected with the resistor R8 of the circuit limiting circuit 4, the output terminal of the comparator U3 is connected with the resistor R8, and the resistor R8 is connected in parallel with the capacitor C3, sliding The rheostat R6 and the noninverting input terminal of the comparator U4 of the follower circuit 5 , the inverting input terminal of the comparator U4 is connected to the resistor R9 and the resistor R10 and grounded.

The working principle of this embodiment is as follows:

Slow start circuit with emergency stop function 1. When switching the contact 1 to contact 2 of switch SW1, the slow start circuit can be started normally. When switching the contact 1 to contact 3 of switch SW1, it is in emergency stop state. The starting circuit does not work; the regulator tube U2 can keep the voltage at the connection point between the slow start circuit 1 with emergency stop function and the current regulation circuit 2 with voltage stabilization in a stable state. When adjusting the resistance of the sliding rheostat R5, that is Changing the total resistance value of the current regulating circuit, the size of the current is adjusted when the stabilized voltage is constant; when the sliding rheostat R5 is adjusted to change the current size, the voltage Vo at the output terminal of the amplifying circuit 3 can be controlled; the amplifying circuit 3 is connected with the current limiting circuit 4 at the Vo point. When adjusting the resistance value of the sliding rheostat R5 to maximize the output of Vo, adjust the sliding rheostat R6 at this time, and the current can be controlled by changing the sum of the resistance values between Vo and ground. The maximum output value achieves the function of limiting the current; the current limiting circuit 4 transmits the signal to the next required circuit through the output terminal sig1 of the follower circuit 5 .

Claims (4)

1. A current adjustable and limitable circuit with emergency stop and slow start function, characterized in that it includes a slow start circuit (1) with emergency stop function, and the slow start circuit (1) with emergency stop function and The current regulation circuit (2) with voltage stabilization is connected, the current regulation circuit (2) with voltage regulation is connected to the amplifying circuit (3), the amplifying circuit (3) is connected to the circuit limiting circuit (4), the The circuit limiting circuit (4) is connected with the follower circuit (5). 2. The current adjustable and limitable circuit with emergency stop and slow start function according to claim 1, characterized in that: the slow start circuit (1) with emergency stop function includes a trigger U1, and the trigger The RST terminal of U1 is connected to the switch SW1, the CV terminal of the trigger U1 is grounded through the capacitor C1, the THR terminal of the trigger U1 is connected to the TRG terminal in parallel and grounded through the resistor R2, and the output terminal of the trigger U1 is connected in parallel to the The regulator tube U2 of the current regulation circuit (2) with voltage stabilization and the resistor R4, the resistor R4 is connected to the non-inverting input terminal of the comparator U3 of the amplifier circuit (3) through the sliding rheostat R5. 3. The current adjustable and limitable circuit with emergency stop and slow start function according to claim 1, characterized in that: the inverting input terminal of the comparator U3 is connected in parallel with the capacitor C4 and the resistor R7 to the circuit limit circuit ( 4) Resistor R8, the output terminal of the comparator U3 is connected to the resistor R8, the resistor R8 is connected in parallel with the capacitor C3, the sliding rheostat R6 and the non-inverting input terminal of the comparator U4 of the follower circuit (5), the comparator The inverting input terminal of U4 is connected to the resistor R9 and the resistor R10 and then grounded. 4. The current adjustable and limitable circuit with emergency stop and slow start function according to claim 1, characterized in that: the amplifying circuit (3) and the current limiting circuit (4) are connected at Vo point .

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