CN210958334U

CN210958334U - Circuit suitable for frequency converter analog quantity output

Info

Publication number: CN210958334U
Application number: CN201922158731.XU
Authority: CN
Inventors: 龚耀京; 张荣亮; 王倩; 杨运海
Original assignee: Shenzhen Farwide Electric Co ltd
Current assignee: Shenzhen Farwide Electric Co ltd
Priority date: 2019-12-05
Filing date: 2019-12-05
Publication date: 2020-07-07
Anticipated expiration: 2029-12-05

Abstract

The utility model discloses a circuit suitable for converter analog output, including resistance R606, triode Q49, chip U66, resistance R606 one end is the free end, triode Q49 base is connected to the resistance R606 other end, triode Q49 collecting electrode connecting resistance R605, the resistance R605 other end is connecting resistance R115 respectively, resistance R111, electric capacity C407 and chip U66 pin 2, resistance R115 other end connecting resistance R106, triode Q49 projecting pole and ground connection are connected to the resistance R106 other end, chip U66 pin 1 and resistance R108 are connected respectively to the resistance R407 other end. The utility model discloses a several free ends can be connected to the corresponding interface of converter, and the procedure that uses the converter selects to use voltage output or current output, saves loaded down with trivial details wire jumper and pulls out and inserts, will the utility model discloses integrated to on the corresponding converter driver, promoted the flexibility suitability of product, improved the competitiveness of product.

Description

Circuit suitable for frequency converter analog quantity output

Technical Field

The utility model relates to an analog circuit specifically is a circuit suitable for converter analog quantity output.

Background

A Variable-frequency Drive (VFD) is a power control device that applies frequency conversion technology and microelectronic technology to control an ac motor by changing the frequency of a working power supply of the motor.

The frequency converter mainly comprises a rectifying unit (alternating current to direct current), a filtering unit, an inverting unit (direct current to alternating current), a braking unit, a driving unit, a detection unit micro-processing unit and the like. The frequency converter adjusts the voltage and frequency of an output power supply by switching on and off an internal IGBT, provides the required power supply voltage according to the actual requirement of the motor, and further achieves the purposes of energy saving and speed regulation. With the continuous improvement of the industrial automation degree, the frequency converter is also widely applied.

However, in the current frequency converter industry, for a long time, a jumper (short-circuit ring) is needed to select the analog quantity output for voltage output and current output, and the problems of inconvenience, easiness in insertion, complex after-sales service and the like exist.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a circuit suitable for converter analog output to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

a circuit suitable for the analog quantity output of a frequency converter comprises a resistor R606, a triode Q49 and a chip U66, wherein one end of the resistor R606 is a free end, the other end of the resistor R606 is connected with a base electrode of a triode Q49, a collector electrode of the triode Q49 is connected with a resistor R605, the other end of the resistor R605 is respectively connected with a resistor R115, a resistor R111, a capacitor C407 and a pin 2 of a chip U66, the other end of the resistor R115 is connected with a resistor R106, the other end of the resistor R106 is connected with an emitter electrode of a triode Q49 and is grounded, the other end of the resistor R407 is respectively connected with a pin 1 of a chip U66 and a resistor R108, the other end of the resistor R108 is connected with a base electrode of the triode Q11, a collector electrode of a triode Q11 is connected with a power supply V1, an emitter electrode of the triode Q11 is respectively connected with the other ends of the resistor R109 and the resistor R111, the other end of the resistor R109, triode Q47 collecting electrode connection power V2, triode Q47 base is connecting resistance R118 and triode Q48 collecting electrode respectively, and electric capacity C408 other end and chip U66 pin 7 are connected respectively to the resistance R118 other end, triode Q48 projecting pole ground connection, triode Q48 base connecting resistance R604, the resistance R604 other end is the free end, chip U66 pin 3 is the connecting resistance R112 other end respectively, grounded capacitance C410 and resistance R116, and resistance R107 is known to the resistance R116 other end, and the resistance R107 other end is the free end, chip U66 model is LF353 DR.

As a further preferable embodiment of the present invention, the triodes Q11, Q47, Q48 and Q49 are NPN triodes.

As a still further preferable aspect of the present invention, the rated voltage of the power supply V1 is 15V.

As a still further preferable aspect of the present invention, the rated voltage of the power supply V2 is 15V.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a several free ends can be connected to the corresponding interface of converter, and the procedure that uses the converter selects to use voltage output or current output, saves loaded down with trivial details wire jumper and pulls out and inserts, will the utility model discloses integrated to on the corresponding converter driver, promoted the flexibility suitability of product, improved the competitiveness of product.

Drawings

Fig. 1 is a schematic circuit diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, in an embodiment of the present invention, a circuit suitable for outputting analog quantity of a frequency converter includes a resistor R606, a transistor Q49, and a chip U66, one end of the resistor R606 is a free end, the other end of the resistor R606 is connected to a base of a transistor Q49, a collector of the transistor Q49 is connected to a resistor R605, the other end of the resistor R605 is respectively connected to a resistor R115, a resistor R111, a capacitor C407, and a pin 2 of the chip U66, the other end of the resistor R115 is connected to a resistor R106, the other end of the resistor R106 is connected to an emitter of the transistor Q49 and grounded, the other end of the resistor R407 is respectively connected to a pin 1 of the chip U66 and a resistor R108, the other end of the resistor R108 is connected to a base of the transistor Q11, a collector of the transistor Q11 is connected to a power supply V1, the emitter of the transistor Q11 is respectively connected to the other ends of the resistor R109 and the resistor R111, the, Resistance R112 and triode Q47 projecting pole, triode Q47 collecting electrode connection power V2, triode Q47 base is connecting resistance R118 and triode Q48 collecting electrode respectively, and the resistance R118 other end is connecting electric capacity C408 other end and chip U66 pin 7 respectively, triode Q48 projecting pole ground connection, triode Q48 base connecting resistance R604, the resistance R604 other end is the free end, chip U66 pin 3 is the connecting resistance R112 other end respectively, grounded capacitance C410 and resistance R116, and resistance R107 is known to the resistance R116 other end, and the resistance R107 other end is the free end, chip U66 model is LF353 DR.

The triodes Q11, Q47, Q48 and Q49 are NPN triodes, the rated voltage of the power supply V1 is 15V, and the rated voltage of the power supply V2 is 15V.

Referring to fig. 1, the circuit realizes that the analog voltage output by the AO _1 signal 0-3V outputs the analog current of 0-10V or the analog current of 0-20mA at the AO1 port, the AO _1 signal directly outputs the analog quantity signal from the DA output port of the DSP controller, and the AO1_ V signal controls whether the output of the AO1 is voltage or current when the output of the FPGA is high or low, specifically, the control principle is that when the output of the AO1_ V is high, Q49 and Q48 are turned on, Q49 is turned on, then R605 participates in the proportional operation, is connected in parallel with R106 and R115, and the equivalent impedance is 8.57K Ω, and as for the voltage drop generated by the turn-on of Q49, compensation is performed in the program operation. And Q48 is turned on, so that the output of U66B is pulled low, Q47 is not turned on, and R112 is not switched in, then the gain of the whole circuit is equivalent impedance 8.57K Ω + R111/8.57K Ω, R111=20K Ω, then gain a =3.333, so by AO _1 outputting 0-3V, AO1= AO _1 a = 0-9.999V;

when the AO1_ V output is low, Q49 and Q48 are not conducted, Q49 is not conducted, then R605 does not participate in proportional operation, and Q48 is not conducted, so that U66B normally serves as a follow output, R112 is connected into feedback, and a resistor R4 and a resistor R4 are used as current sampling resistors to form a constant current source circuit, and the gain of the whole circuit is standard differential amplification circuit a =20K Ω/30K Ω =0.6666, so that when AO _1 outputs 0-3, the voltage Vo = AO _1 a =0-1.999V applied to the resistor R4(100 Ω), and converted into current I = Vo/R4=0-19.999 mA. The voltage output of 0-10V and the current output of 0-19.9999mA are realized by the principle.

To sum up, the utility model discloses a several free ends can be connected to the corresponding interface of converter, and the procedure that uses the converter selects to use voltage output or current output, saves loaded down with trivial details wire jumper and pulls out and insert, will the utility model discloses integrated to on the corresponding converter driver, promoted the flexibility suitability of product, improved the competitiveness of product.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A circuit suitable for frequency converter analog quantity output is characterized by comprising a resistor R606, a triode Q49 and a chip U66, wherein one end of the resistor R606 is a free end, the other end of the resistor R606 is connected with a base electrode of a triode Q49, a collector electrode of a triode Q49 is connected with a resistor R605, the other end of the resistor R605 is respectively connected with a resistor R115, a resistor R111, a capacitor C407 and a pin 2 of a chip U66, the other end of the resistor R115 is connected with a resistor R106, the other end of the resistor R106 is connected with an emitter electrode of a triode Q49 and grounded, the other end of the capacitor C407 is respectively connected with a pin 1 of a chip U66 and a resistor R108, the other end of the resistor R108 is connected with a base electrode of a triode Q11, a collector electrode of the triode Q11 is connected with a power supply V1, an emitter electrode of the triode Q11 is respectively connected with the other ends of the resistor R109 and the resistor R111, the other, Resistance R112 and triode Q47 projecting pole, triode Q47 collecting electrode connection power V2, triode Q47 base is connecting resistance R118 and triode Q48 collecting electrode respectively, and the resistance R118 other end is connecting electric capacity C408 other end and chip U66 pin 7 respectively, triode Q48 projecting pole ground connection, triode Q48 base connecting resistance R604, the resistance R604 other end is the free end, chip U66 pin 3 is the connecting resistance R112 other end respectively, grounded capacitance C410 and resistance R116, and resistance R107 is known to the resistance R116 other end, and the resistance R107 other end is the free end, chip U66 model is LF353 DR.

2. The circuit of claim 1, wherein the transistor Q11 is an NPN transistor.

3. The circuit suitable for the analog quantity output of the frequency converter according to claim 2, wherein the rated voltage of the power supply V1 is 15V.

4. The circuit suitable for the analog quantity output of the frequency converter according to claim 3, wherein the rated voltage of the power supply V2 is 15V.

5. The circuit of claim 4, wherein the transistors Q47, Q48 and Q49 are NPN transistors.