Insulation monitoring device based on TLC1543 and single-chip microcomputer

Abstract

The utility model relates to an insulation monitoring device based on TLC1543 and a single-chip microcomputer. The device is composed of an input DC voltage conversion part, an analog voltage sampling part, an AD conversion and execution part and a manual setting part. The direct-current voltage conversion part is composed of an AD637 direct-current converter, an LM324 operational amplifier and an S8050 triode; the analog voltage sampling part is completed by a TLC1543AD converter; the AD conversion and execution part is composed of a 2597H1 relay, an S8050 triode, an AT89C52 single chip microcomputer, a 521-1 optical coupler, a first light emitting diode and a second light emitting diode; the manual setting part is composed of a knob switch. According to the utility model, the problems that the existing insulation monitoring device needs to use more discrete components, the cost is high, the failure rate is high and the like are solved, the protection action when the electric leakage exceeds the standard is carried out based on the TLC1543 and the single-chip microcomputer, the number of components of the insulation monitoring device is greatly reduced, the cost is reduced, and meanwhile, due to the fact that the used components are less, the cost is reduced. And the reliability of the insulation monitoring device is improved.

Description

Technical Field

[0001] The utility model relates to an insulation monitoring device used in rail transit vehicles, which is an insulation monitoring device based on TLC1543 and a single-chip microcomputer. Background Art

[0002] The insulation monitoring devices used in existing railway passenger cars and rail transit vehicles all use discrete components and traditional 555 timing chips and some peripheral circuits to achieve protection actions when leakage exceeds the standard. Many discrete components are used, the cost is high, and the failure rate is high. Utility Model Content

[0003] The utility model overcomes the defects of the existing insulation monitoring device that many discrete components must be used, the cost is high, and the failure rate is high. The utility model adopts the protection action based on TLC1543 and single-chip microcomputer when the leakage exceeds the standard, which greatly reduces the number of components of the insulation monitoring device and reduces the cost. At the same time, due to the use of fewer components, the reliability of the insulation monitoring device is improved.

[0004] The technical scheme of the utility model is: using an AD637 direct current converter 1 to process the -5V to +5V direct current voltage output by the sensor and send it to the second foot of TLC1543 for judgment; at the same time, the circuit composed of an LM324 operational amplifier 2 and an S8050 transistor 3 can make the S8050 transistor 3 turned on when the sensor outputs a positive value, so that the P1.5 port of the AT89C52 single-chip computer 7 is at a low level; when the sensor outputs a negative value, the S8050 transistor 3 is turned off, so that the P1.5 port of the AT89C52 single-chip computer 7 is at a high level; combined with the position of the user's knob switch setting and the level state of the P1.5 port, when the output voltage of the sensor exceeds the value set by the user's knob switch, the 37th foot (relay protection), the 38th foot (negative terminal leakage), and the 39th foot (positive terminal leakage) of the AT89C52 single-chip computer 7 output corresponding levels for leakage indication and relay protection.

[0005] The beneficial effects of the utility model are that the number of components of the insulation monitoring device is greatly reduced, the cost is reduced, and at the same time, the reliability of the insulation monitoring device is improved due to the use of fewer components. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] The following is combined with Figure 1 The utility model is further described.

[0007] Figure 1 It is an electrical schematic diagram of the utility model.

[0008] In the figure: AD637 DC converter 1, LM324 operational amplifier 2, S8050 transistor 3, TLC1543AD converter 4, 2597H1 relay 5, S8050 transistor 6, AT89C52 single-chip computer 7, 521-1 optocoupler 8, first light-emitting diode 9, second light-emitting diode 10, knob switch 11. DETAILED DESCRIPTION

[0009] The following is combined with Figure 1 The utility model is further described in detail:

[0010] An insulation monitoring device based on TLC1543 and single chip microcomputer, see Figure 1 The device is composed of an input DC voltage conversion part, an analog voltage sampling part, an AD conversion and execution part, and a manual setting part; the DC voltage conversion part includes: an AD637 DC converter 1, an LM324 operational amplifier 2, and an S8050 transistor 3;

[0011] The analog voltage sampling part is completed by TLC1543AD converter 4;

[0012] The AD conversion and execution part is composed of a 2597H1 relay 5, an S8050 transistor 6, an AT89C52 single-chip computer 7, a 521-1 optical coupler 8, a first light-emitting diode 9, and a second light-emitting diode 10;

[0013] The manual setting part is composed of a knob switch 11.

[0014] The specific working principle of the device is: when the sensor voltage output range is between -5V and +0V, the AD637 DC converter 1 processes the DC voltage output by the sensor and sends it to the second pin of TLC1543 for judgment. At the same time, the circuit composed of LM324 op amp 2 and S8050 transistor 3 turns on S8050 transistor 3, so that the P1.5 port of AT89C52 microcontroller 7 is at a low level. Combined with the position of the user's knob switch setting, when the output voltage of the sensor exceeds the position set by the user's knob switch, When the value is reached, the AT89C52 single-chip computer 7 software judges that the AT89C52 single-chip computer 7 outputs a low level to drive the 521-1 optocoupler 8 to operate. After the 521-1 optocoupler 8 operates, the S8050 transistor 6 is turned on to supply power to the 2597H1 relay 5 coil. The normally open or normally closed contact of the 2597H1 relay 5 can be connected to the required protection load. At the same time, the 39th foot of the AT89C52 single-chip computer 7 outputs a low level to supply power to the first light-emitting diode 9, which lights up to warn of leakage.

[0015] When the sensor voltage output range is between 0V and +5V, the AD637 DC converter 1 processes the DC voltage output by the sensor and sends it to the second pin of TLC1543 for judgment. At the same time, the circuit composed of LM324 op amp 2 and S8050 transistor 3 turns off S8050 transistor 3, so that the P1.5 port of AT89C52 microcontroller 7 is high level. Combined with the position of the user's knob switch setting, when the output voltage of the sensor exceeds the value set by the user's knob switch, the AT89 The judgment of C52 single chip computer 7 software makes the 37th foot of AT89C52 single chip computer 7 output low level to drive 521-1 optocoupler 8 to operate. After 521-1 optocoupler 8 operates, S8050 transistor 6 is turned on to supply power to 2597H1 relay 5 coil. The normally open or normally closed contact of 2597H1 relay 5 can be connected to the required protection load. At the same time, the 38th foot of AT89C52 single chip computer 7 outputs low level to supply power to the second light emitting diode 10, which lights up to warn of leakage.

Claims

1. An insulation monitoring device based on a TLC1543 converter and a single-chip microcomputer, consisting of an input DC voltage conversion part, an analog voltage sampling part, an AD conversion and execution part, and a manual setting part; the DC voltage conversion part includes: AD637 DC converter (1), LM324 operational amplifier (2), S8050 transistor (3); the analog voltage sampling part is completed by TLC1543AD converter (4); the AD conversion and execution part is composed of 2597H1 relay (5), S8050 transistor (6), AT89C52 single chip computer (7), 521-1 optical coupler (8), first light emitting diode (9), second light emitting diode (10); the manual setting part is composed of knob switch (11); it is characterized in that: When the sensor voltage output range is between -5V and +0V, the AD637 DC converter (1) processes the DC voltage output by the sensor and sends it to the second pin of the TLC1543AD converter (4) for judgment. At the same time, the circuit composed of the LM324 operational amplifier (2) and the S8050 transistor (3) turns on the S8050 transistor (3) so that the P1.5 port of the AT89C52 single-chip computer (7) is at a low level. Combined with the position of the user's knob switch setting, when the output voltage of the sensor exceeds the value set by the user's knob switch, the AT8 The software of the 9C52 single chip microcomputer (7) determines that the 37th foot of the AT89C52 single chip microcomputer (7) outputs a low level to drive the 521-1 optical coupler (8) to operate. After the 521-1 optical coupler (8) operates, the S8050 transistor (6) is turned on to supply power to the coil of the 2597H1 relay (5). The normally open or normally closed contact of the 2597H1 relay (5) can be connected to a related protection load. At the same time, the 39th foot of the AT89C52 single chip microcomputer (7) outputs a low level to supply power to the first light emitting diode (9), which is lit to warn of negative leakage. When the sensor voltage output range is between 0V and +5V, the AD637 DC converter (1) processes the DC voltage output by the sensor and sends it to the second pin of the TLC1543AD converter (4) for judgment. At the same time, the circuit composed of the LM324 operational amplifier (2) and the S8050 transistor (3) turns off the S8050 transistor (3) so that the P1.5 port of the AT89C52 microcontroller (7) is at a high level. Combined with the position of the user's knob switch setting, when the output voltage of the sensor exceeds the value set by the user's knob switch, the AT89C52 microcontroller (7) is turned off. The software of the C52 single chip microcomputer (7) determines that the 37th pin of the AT89C52 single chip microcomputer (7) outputs a low level to drive the 521-1 optical coupler (8) to operate. After the 521-1 optical coupler (8) operates, the S8050 transistor (6) is turned on to supply power to the coil of the 2597H1 relay (5). The normally open or normally closed contact of the 2597H1 relay (5) can be connected to a related protection load. At the same time, the 38th pin of the AT89C52 single chip microcomputer (7) outputs a low level to supply power to the second light emitting diode (10), which is lit to warn of positive leakage.

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