CN218603384U - Signal transmission control module - Google Patents

Abstract

The utility model discloses a signal transmission control module, including switching power supply protection circuit, amplifier circuit and reducing circuit, adopt operational amplifier to build amplifier circuit at signal analog quantity transmitting terminal and make its signal amplification ten times, build reducing circuit at the receiving terminal and reduce amplified signal ten times to through electric capacity filtering interfering signal, effectively avoid signal interference at the in-process of transmission, it is simple and convenient that the application gets up.

Description

Signal transmission control module

Technical Field

The utility model belongs to the technical field of analog quantity data transmission, especially, relate to a signal transmission control module.

Background

When the signals of eight frequency converters applied to the high-speed central boiler of the long-term stock share of the medium train are remotely transmitted to an external display instrument, the signals are influenced by interference signals, the display numerical value of a frequency meter fluctuates all the time, the amplitude is about 4-5 HZ, and the signal transmission is seriously interfered. Such a situation may adversely affect the operator's judgment of the boiler operation.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving and meetting the problem of interference among the solution signal transmission, prevent because demonstration and the inaccurate emergence that leads to the accident of control signal to a signal transmission control module is provided, the circuit principle is simple, can effectively prevent the interference among the signal transmission process.

In order to realize the above-mentioned utility model purpose, the utility model provides a signal transmission control module, including switching power supply protection circuit, switching power supply protection circuit uses ice2a0565 module as the main part, still include alternating current power supply, common mode filter, bridge rectifier filter, the transformer, alternating current power supply connects common mode filter, common mode filter connects bridge rectifier filter input, bridge rectifier filter's output respectively with switching transformer's primary winding, starting resistance R801 and R803 link to each other, switching transformer's primary winding connects ice2a0565 module 4, no. 5 tube corners, switching transformer's secondary winding middle part ground connection, the secondary winding both ends form two positive and negative links of switching transformer, two positive and negative links are respectively with the earth connection line and are connected the filter, resistance R801 and R803 connect electric capacity C818, electric capacity C818 connects ice2a0565 module No. 7 pins, ice2a0565 module No. 1 pin connects electric capacity C807 back ground connection, including two sets of amplifier circuit. The amplifying circuit takes an operational amplifier LM741 as a core, 4 points and 7 points of the operational amplifier are amplifier double power supplies, and the amplifier double power supplies are respectively connected with a positive connecting end and a negative connecting end of a switch transformer; an end angle 2 of the operational amplifier LM741 is connected with one end of a resistor R306, the other end of the resistor R306 is a connecting end, the resistor R307 is connected with the end angle 2 and an end angle 6 of the operational amplifier LM741, the end angle 6 is an output end, and R307= R306 multiplied by the amplification factor; the amplifying circuit comprises a first amplifying circuit of the signal transmitting end and a second amplifying circuit of the signal receiving end, the amplification factor in the first amplifying circuit is larger than 1, the connecting end at the other end of the resistor R306 is a first connecting end A1, and the output end of the end corner 6 is a first output end B1. The amplification factor in the second amplifying circuit is less than 1, the connecting end at the other end of the resistor R306 is a second connecting end A2, and the output end of the end corner 6 is a second output end B2; the signal is connected with a first connecting end A1 of the first amplifying circuit, a first output end B1 is connected with one end of a remote signal transmission line, the other end of the remote signal transmission line is connected with a second connecting end A2 of the second amplifying circuit, and a second output end B2 is connected with the display instrument; the first output end B1 is connected with the capacitor C12, and the second connection end A2 is connected with the capacitor C2.

Further, the amplification factor of the second amplification circuit is the reciprocal of the amplification factor of the first amplification circuit.

Further, the second connection terminal A2 is connected to a diode D1.

The utility model has the advantages that:

(1) The protection to the power supply signal is better, and the power supply side fault signal caused by the fault of the power supply end is prevented from entering the remote transmission signal system of the frequency converter.

(2) Interference signals are filtered through capacitors of the signal transmitting end and the signal receiving end, if residual signals pass through a diode on a second connecting end A2 of the signal receiving end to form half-wave rectification, then the interference signals are changed into direct current, and the interference signals are transmitted remotely and reduced through an amplifying circuit, so that signals to be received in a task are achieved.

(3) The device is simple, strong in operability, high in precision and low in cost.

(4) The Ice2a0565 integrated circuit has the functions of perfect overvoltage, overload, overcurrent, undervoltage, overheat closing protection, undervoltage locking, automatic restart and low-power consumption standby, and has the characteristics of few peripheral components and simple circuit.

Drawings

FIG. 1 is a schematic circuit diagram of a signal transmission control module;

fig. 2 is a schematic circuit diagram of the signal transmission control module.

Detailed Description

Referring to fig. 1 and 2, the utility model discloses a signal transmission control module, including switching power supply protection circuit, switching power supply protection circuit uses ice2a0565 module as the main part, still includes common mode filter, the bridge rectifier filter of BR1, the C801 constitution, transformer TR1 that 220V alternating current power supply, CX804, CX801 constitute. The 220V alternating current power supply is connected with a common mode filter, the common mode filter is connected with a bridge rectifier filter, the input end of the bridge rectifier filter is connected with the common mode filter, the output end of the bridge rectifier filter is respectively connected with a primary winding of a switch transformer, starting resistors R801 and R803, the primary winding of the switch transformer is connected with No. 4 tube corners and No. 5 tube corners of an ice2a0565 module, the middle part of a secondary winding of the switch transformer is grounded, the two ends of the secondary winding form positive and negative connecting ends of the switch transformer, the positive and negative connecting ends are respectively connected with a filter between the grounding wires, the resistors R801 and R803 are connected with a capacitor C818, the capacitor C818 is connected with No. 7 pin of the ice2a0565 module, and the No. 1 pin of the ice2a0565 module is connected with a capacitor C807 and then grounded.

The utility model discloses a signal transmission control module still includes two sets of amplifier circuit. The amplifying circuit takes an operational amplifier LM741 as a core, 4 points and 7 points of the operational amplifier are amplifier double power supplies, and the amplifier double power supplies are respectively connected with a positive connecting end and a negative connecting end of a switch transformer; an end angle 2 of the operational amplifier LM741 is connected with one end of the resistor R306, the other end of the resistor R306 is a connecting end, the resistor R307 is connected with the end angle 2 and an end angle 6 of the operational amplifier LM741, the end angle 6 is an output end, and R307= R306 multiplied by the amplification factor.

The amplifying circuit of the embodiment includes a first amplifying circuit of a signal transmitting end and a second amplifying circuit of a signal receiving end, wherein the amplification factor in the first amplifying circuit is 10 times, the connecting end is a first connecting end A1, and the output end is a first output end B1. The amplification factor in the second amplifying circuit is 0.1 times, the connecting end is a second connecting end A2, and the output end is a second output end B2. When the main circuit of the frequency converter or the external interference environment generates an interference signal to the external display instrument, the analog quantity signal of the frequency converter can be connected with the first connecting end A1 of the first amplifying circuit, the first output end B1 is connected with one end of the remote signal transmission line, the other end of the remote signal transmission line is connected with the second connecting end A2 of the second amplifying circuit, and the second output end B2 is connected with the display instrument. The transmission signal is amplified by 10 times at one end of the remote signal transmission line through the first amplification circuit, and then the transmission signal is amplified by 0.1 time at the other end of the remote signal transmission line through the second amplification circuit, so that the signal is restored, and the effect of preventing signal interference is achieved. The circuit is mainly designed for transmitting analog quantity in a long distance, an analog quantity repeater is not needed to be erected in the middle, the resistance ratio can be changed along with the distance, the amplification factor of the first amplification circuit is larger than 1, the amplification factor of the second amplification circuit is smaller than 1, the amplification factor of the second amplification circuit is the reciprocal of the amplification factor of the first amplification circuit in general conditions, different amplification factors can be set according to requirements, and the attenuation is weaker when the amplification factor is larger.

In the process of signal remote transmission, if the environment is a non-pure resistive load space, an interference signal is formed, and the signal can be an interference signal in any shape, and has no period, no fixed amplitude and no law. In the interference environment, the system filters an alternating signal from the system through a capacitor C12 at a signal transmitting end and a capacitor C2 at a signal receiving end, and forms half-wave rectification if a residual signal passes through a diode D1 on a second connecting end A2 of the signal receiving end, and then converts the interference signal into direct current. The interference signal and the remote transmission are reduced through the amplifying circuit, so that the signal which is wanted to be received in the task is achieved.

The signal transmission control module of the utility model can be used under the condition that the analog quantity signal of 0-10V or 0-20MA is interfered. If the current analog quantity is 0-20mA, the current analog quantity can also be converted into a voltage analog quantity, and the current analog quantity value is connected with a 500 ohm resistor in parallel and is also converted into a 0-10V analog quantity.

The power input, start and output AC power 220V is sent to the common mode filter composed of CX804 and CX801 through the switch SW and the fuse F1, on one hand, high frequency interference signals in the power grid are filtered, and on the other hand, pollution of the high frequency switch interference generated by the switch power to the power grid is inhibited. The filtered 220V alternating current is rectified by a BR1 bridge rectifier circuit and filtered by a C801 circuit to generate 300V direct current voltage. The voltage is applied to No. 4 and No. 5 tube corners of an ice2a0565 module through a primary winding of a switching transformer, and the other path charges C818 through a starting resistor R801/R803, so that the No. 7 tube corner voltage is increased. At the same time, the soft start inside the U804 charges the tube corner capacitor c807 of No. 1. When the voltage of the No. 7 pin rises to 13.5V and the voltage of the No. 1 pipe teaching rises to 5.3V, the internal functional circuit starts to work normally. The internal exciting circuit outputs high-frequency switching pulse to make the field effect power switch tube in normal high-frequency switching state. When the circuit starts oscillation, as long as the No. 7 pipe teaching is not lower than 8.5V, the circuit locks the normal oscillation state. And a two-stage amplifying circuit is adopted, namely, a first amplifying circuit is adopted at a signal analog quantity transmitting end to amplify the signal by ten times, and a second amplifying circuit is adopted at a receiving end to reduce the amplified signal by ten times.

Claims (3)

1. A signal transmission control module comprises a switch power supply protection circuit, wherein the switch power supply protection circuit takes an ice2a0565 module as a main body, and further comprises an alternating current power supply, a common mode filter, a bridge rectifier filter and a transformer, the alternating current power supply is connected with the common mode filter, the common mode filter is connected with the input end of the bridge rectifier filter, the output end of the bridge rectifier filter is respectively connected with a primary winding of the switch transformer, starting resistors R801 and R803, the primary winding of the switch transformer is connected with tube corners No. 4 and No. 5 of the ice2a0565 module, the middle part of a secondary winding of the switch transformer is grounded, two ends of the secondary winding form positive and negative connecting ends of the switch transformer, the positive and negative connecting ends are respectively connected with the filter between grounding wires, the resistors R801 and R803 are connected with a capacitor C818, the capacitor C818 is connected with a No. 7 pin of the ice2a0565 module, and a No. 1 pin of the ice2a0565 module is connected with a capacitor C807 and then grounded, and the switch power supply protection circuit is characterized in that: the amplifier comprises two groups of amplifying circuits, wherein the amplifying circuits take an operational amplifier LM741 as a core, 4 and 7 points of an operational amplifier are dual power supplies of the amplifier, and the amplifying circuits are respectively connected with a positive connecting end and a negative connecting end of a switching transformer; an end angle 2 of the operational amplifier LM741 is connected with one end of a resistor R306, the other end of the resistor R306 is a connecting end, the resistor R307 is connected with the end angle 2 and an end angle 6 of the operational amplifier LM741, the end angle 6 is an output end, and R307= R306 multiplied by the amplification factor; the amplifying circuit comprises a first amplifying circuit of a signal transmitting end and a second amplifying circuit of a signal receiving end, wherein the amplification factor in the first amplifying circuit is more than 1, the connecting end at the other end of the resistor R306 is a first connecting end, the output end of the end corner 6 is a first output end, the amplification factor in the second amplifying circuit is less than 1, the connecting end at the other end of the resistor R306 is a second connecting end, and the output end of the end corner 6 is a second output end; the signal is connected with a first connecting end of the first amplifying circuit, a first output end is connected with one end of the remote signal transmission line, the other end of the remote signal transmission line is connected with a second connecting end of the second amplifying circuit, and a second output end is connected with the display instrument; the first output end is connected with the capacitor C12, and the second connecting end is connected with the capacitor C2.

2. The signal transmission control module according to claim 1, wherein: the amplification factor of the second amplification circuit is the reciprocal of the amplification factor of the first amplification circuit.

3. The signal transmission control module according to claim 1, wherein: the second connection is connected to diode D1.

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