CN210898970U

CN210898970U - High-power high-stability continuously adjustable signal switching circuit

Info

Publication number: CN210898970U
Application number: CN202020018576.1U
Authority: CN
Inventors: 曹晓月; 张旭秀
Original assignee: Beijing Wonderroad Magnesium Technology Co Ltd
Current assignee: Beijing Wonderroad Magnesium Technology Co Ltd
Priority date: 2020-01-06
Filing date: 2020-01-06
Publication date: 2020-06-30
Anticipated expiration: 2030-01-06

Abstract

The utility model relates to a control circuit technical field specifically discloses a high-power high stable continuously adjustable signal switching circuit, including the transformer, switch S1, switch S2, air switch K1, air switch K2, rectifier tube D1, triode V1, triode V2, triode V3, integrated circuit IC1, integrated circuit IC2, voltage comparator IC3, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5 and voltage divider RP. The utility model provides a prior art circuit switch back voltage unstability, electric current undersize, can not be in succession adjustable and overcurrent protection's problem.

Description

High-power high-stability continuously adjustable signal switching circuit

Technical Field

The utility model relates to a control circuit technical field especially relates to a high-power high stable continuously adjustable's signal switching circuit.

Background

The existing switching circuit comprises a direct switching circuit, a high-power switching circuit and the like, although the switching circuits can switch an alternating current power supply and a direct current power supply, the voltage can be continuously adjusted but not much, and once a load is added, the phenomena of insufficient supply voltage and unstable current can occur.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a high-power high stable continuously adjustable signal switching circuit to solve the problem that prior art circuit switching back voltage is unstable, the electric current undersize, can not be continuously adjustable and overcurrent protection.

In order to solve the technical problem, the utility model provides a high-power high stable continuously adjustable signal switching circuit, including the transformer, switch S1, switch S2, air switch K1, air switch K2, rectifier tube D1, triode V1, triode V2, triode V3, integrated circuit IC1, integrated circuit IC2, voltage comparator IC3, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5 and voltage RP bleeder; an input power source of the transformer is alternating current of an AC220V, output voltages of the transformer are respectively AC220V corresponding to a contact M V, AC110V corresponding to the contact M V and AC25V corresponding to the contact M V, one end of the switch S V is correspondingly connected with the contacts M V and M V, the other end of the switch S V is connected with the air switch K V, one end of the switch S V is connected with the contact M V, the other end of the switch S V is connected with the rectifier tube D V, the rectifier tube D V is connected with the air switch K V, the triode V V, the voltage comparator IC V and the integrated circuit IC V in parallel, the triode V V is connected with the capacitor C V and the resistor R V in parallel, the inverted terminal of the voltage comparator IC V and the voltage divider RP are connected with the voltage divider in series, the integrated circuit V is connected with the integrated circuit IC V in parallel, and the integrated circuit V is connected with the capacitor C V and the integrated circuit V in parallel with the integrated circuit V and the integrated circuit 36, the output end of the voltage comparator IC3 is connected in parallel with the base of the triode V1 and the e pole of the triode V3, and the triode V3 is connected in series with the resistor R5 and the resistor R6.

Preferably, an output terminal of the voltage comparator IC3 is connected to the resistor R1.

Preferably, the integrated circuit IC1 is connected to the capacitor C5.

The utility model discloses a high-power high-stability continuously adjustable signal switching circuit improves the current voltage switching circuit loop, plans the DC/AC voltage switching to the same circuit and continuously adjusts the voltage of the DC voltage, comprises a voltage stabilizing circuit formed by combining a reference source circuit (IC1 and IC2), a voltage division sampling circuit (R3, RP and R4), a voltage comparison circuit (IC3) and a composite power adjusting circuit (V1 and V2), when the direct current voltage is output, the direct current voltage can stably output the specified direct current voltage when the direct current voltage is connected to a load, thereby realizing the output of large current, the over-current protection circuit (V3, R5 and R6) is added on the basis of the protection measures such as a fuse and the like, so that the protection circuit can not cause the damage of the circuit due to the over-voltage and over-current problems and protects the front-stage circuit to a certain extent.

Drawings

Fig. 1 is a circuit diagram of the present invention, which is a high-power, high-stability, continuously adjustable signal switching circuit in the market.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1, the high-power, high-stability and continuously adjustable signal switching circuit of this embodiment includes: the air switch comprises a transformer, a switch S1, a switch S2, an air switch K1, an air switch K2, a rectifier tube D1, a triode V1, a triode V2, a triode V3, an integrated circuit IC1, an integrated circuit IC2, a voltage comparator IC3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5 and a voltage divider RP.

An input power source of the transformer is alternating current of an AC220V, output voltages of the transformer are respectively AC220V corresponding to a contact M V, AC110V corresponding to the contact M V and AC25V corresponding to the contact M V, one end of the switch S V is correspondingly connected with the contacts M V and M V, the other end of the switch S V is connected with the air switch K V, one end of the switch S V is connected with the contact M V, the other end of the switch S V is connected with the rectifier tube D V, the rectifier tube D V is connected with the air switch K V, the triode V V, the voltage comparator IC V and the integrated circuit IC V in parallel, the triode V V is connected with the capacitor C V and the resistor R V in parallel, the inverted terminal of the voltage comparator IC V and the voltage divider RP are connected with the voltage divider in series, the integrated circuit V is connected with the integrated circuit IC V in parallel, and the integrated circuit V is connected with the capacitor C V and the integrated circuit V in parallel with the integrated circuit V and the integrated circuit 36, the output end of the voltage comparator IC3 is connected in parallel with the base electrode of the triode V1 and the e electrode of the triode V3, the triode V3 is connected in series with the resistor R5 and the resistor R6, the output end of the voltage comparator IC3 is connected with the resistor R1, and the rest of the integrated circuit IC1 is connected with the capacitor C5.

The high-power high-stability continuously adjustable signal switching circuit of the embodiment mainly comprises: the device comprises a stepping voltage regulating circuit, a rectifying and filtering circuit, a reference element circuit, a partial pressure sampling circuit, a composite power regulating circuit and an overcurrent protection circuit. Wherein the stepping voltage regulating circuit is a main circuit.

Inputting a precision reference circuit: the input voltage is supplied by stages, so that the voltage drop on the adjusting tube is reduced in a stable current range, the tube temperature is reduced, the efficiency is improved, and the change of a reference power supply can be brought. Therefore, a three-terminal regulator block IC1 is added before the input of the reference circuit IC2, and the regulated output of the reference circuit IC2 is supplied to the reference circuit IC2 after being primarily regulated, and is input to the non-inverting terminal of the voltage comparator IC3 as a reference voltage. The three-terminal regulator block IC1 and the reference circuit IC2 constitute a precision reference circuit.

The voltage division sampling circuit: the resistor R3, the voltage divider RP and the resistor R4 form a voltage division sampling circuit. The voltage divider RP can be adjusted according to the range, and the indication number is displayed on the parallel-connected voltmeter, so that the continuous adjustment of the voltage is realized.

The composite power adjusting circuit: the triodes V1 and V2 form a composite power regulation circuit. The control current of the comparator circuit is amplified to a load current of several amperes, and the driving capability is improved.

A comparator circuit: the comparator circuit is mainly constituted by a voltage-dividing comparator IC 3. The non-inverting terminal of the reference voltage is connected to a reference source, and the inverting terminal of the reference voltage is connected to a sampling voltage. The sampling voltage is input into the reverse end of the voltage comparator LM358 and is compared with the reference source voltage input from the same-phase end in the voltage comparison circuit LM358, and the output result voltage is used for controlling the conduction degree of the composite tube.

Load overcurrent protector: the triode V3, the resistor R5 and the resistor R6 form a protection circuit. The over-current sampling resistor R6 is connected in series with the negative terminal of the power supply and is not arranged in the voltage stabilizing range, and the output voltage is basically not influenced. The protection circuit can not damage the circuit caused by the problem of overvoltage and overcurrent generally and protects the previous stage circuit to a certain extent.

The working principle of the high-power high-stability continuously adjustable signal switching circuit of the embodiment is as follows: when the switch S1 contacts the contact M1, K1 is switched on, and the circuit outputs 220V alternating current; when the switch S1 contacts the point M2, K1 is switched on, and the circuit outputs 110V alternating current; when the switch S2 contacts the contact M3, the power supply is transformed and then passes through the rectifier tube to become a dc voltage to the regulator circuit, one path of the dc voltage is primarily regulated by the IC1 and then supplied to the IC2, and the regulated voltage is outputted as a reference voltage, which is directly supplied to the non-inverting terminal of the voltage comparator IC3(LM358), and the other path of the dc voltage is used as a power supply of the IC 3. When the power is on, the IC3 is cut off and has no output because the V1 and the V2 are not started, the reverse end of the IC is also provided with no voltage, the comparator IC3 immediately outputs high level to enable the V1 and the V2 to be rapidly conducted, the voltage stabilizing output starts to rise from 0V, the voltage divided and sampled by the resistor R3, the voltage divider RP and the resistor R4 and sent to the reverse end of the comparator IC3 also rises, and the voltage of the output end of the IC3 is reduced to the set voltage stabilizing value after being compared with the reference voltage of the same phase end. After the load is connected again, the voltage stabilizing voltage can be reduced, and at the moment, the circuit starts voltage stabilizing work, and the specific voltage stabilizing process is as follows: voltage-stabilized output falling → voltage falling at the reverse phase of IC3 → the output end of IC3 becoming bigger after reverse phase comparison → V1, V2 turning on → stable output is normal. The movable voltage divider RP can make the voltage continuously output 1.25V-25V direct current and output the voltage stably.

Voltage stabilizing operation: the voltage is input by adopting a stepping voltage regulation mode, although the voltage drop on the regulating tube is reduced in the range of stabilizing the current, the tube temperature is reduced, and the efficiency is improved, the voltage of the reference power supply can be changed, and after the voltage is stabilized, the output voltage can also be changed along with the addition of the load, so that the improvement of voltage stabilization of the circuit is necessary, and the output voltage can not be changed along with the addition of the load; continuously and adjustably operating: in the existing switching circuit, most of the existing switching circuits can only output appointed alternating current and direct current power supplies, and in a few of continuously adjustable voltage circuits, continuous voltage cannot be output due to instability of the circuit, so that a continuously adjustable voltage-stabilized power supply circuit is needed; and (3) large-current guarantee operation: when the output voltage of the direct current voltage stabilizer is ensured, the output current is also ensured to be larger; and (3) overcurrent protection operation: the existing protective measures added with the fuse can not meet the protection requirements of high power and high current, so that the addition of the overcurrent protection circuit can not cause permanent damage of the circuit due to overvoltage and overcurrent problems and also provides guarantee for a front-stage circuit.

The embodiments of the present invention have been presented for purposes of illustration and description, and are not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiment was chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. A high-power high-stability continuously adjustable signal switching circuit is characterized by comprising a transformer, a switch S1, a switch S2, an air switch K1, an air switch K2, a rectifier tube D1, a triode V1, a triode V2, a triode V3, an integrated circuit IC1, an integrated circuit IC2, a voltage comparator IC3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5 and a voltage divider RP; an input power source of the transformer is alternating current of an AC220V, output voltages of the transformer are respectively AC220V corresponding to a contact M V, AC110V corresponding to the contact M V and AC25V corresponding to the contact M V, one end of the switch S V is correspondingly connected with the contacts M V and M V, the other end of the switch S V is connected with the air switch K V, one end of the switch S V is connected with the contact M V, the other end of the switch S V is connected with the rectifier tube D V, the rectifier tube D V is connected with the air switch K V, the triode V V, the voltage comparator IC V and the integrated circuit IC V in parallel, the triode V V is connected with the capacitor C V and the resistor R V in parallel, the inverted terminal of the voltage comparator IC V and the voltage divider RP are connected with the voltage divider in series, the integrated circuit V is connected with the integrated circuit IC V in parallel, and the integrated circuit V is connected with the capacitor C V and the integrated circuit V in parallel with the integrated circuit V and the integrated circuit 36, the output end of the voltage comparator IC3 is connected in parallel with the base of the triode V1 and the e pole of the triode V3, and the triode V3 is connected in series with the resistor R5 and the resistor R6.

2. The high-power high-stability continuously adjustable signal switching circuit according to claim 1, wherein an output terminal of the voltage comparator IC3 is connected to the resistor R1.

3. The high-power high-stability continuously adjustable signal switching circuit according to claim 1, wherein said integrated circuit IC1 is connected to said capacitor C5.