CN216052062U - Be used for railway safety type relay electrical characteristic testing arrangement - Google Patents
Be used for railway safety type relay electrical characteristic testing arrangement Download PDFInfo
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- CN216052062U CN216052062U CN202121497320.4U CN202121497320U CN216052062U CN 216052062 U CN216052062 U CN 216052062U CN 202121497320 U CN202121497320 U CN 202121497320U CN 216052062 U CN216052062 U CN 216052062U
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Abstract
The utility model relates to an electrical characteristic testing device for a railway safety relay, which can output a programmable direct current power supply with 0-15V and 0-5A programming resolution of 5mV, provides a measuring power supply with low manufacturing cost, high precision, programmability and good stability for measuring the electrical characteristics of a current coil of the railway safety relay, and comprises a core processing unit, a power supply module, a display module, a control module, an output module, a current expansion module, an acquisition module, a communication module and the like. The direct current programmable power supply receives an instruction of voltage output by an upper computer through the communication module, the core processing unit calculates a voltage value to be output into internal control data, the control module is driven to output control voltage, the voltage value to be output is converted into the voltage to be output through the output module, the direct current programmable power supply acquires the output voltage and current value in real time through the acquisition module and compares the acquired voltage and current value with a set value, high-precision output is achieved, and meanwhile, the display unit displays the output voltage and current value in real time.
Description
Technical Field
The utility model relates to a programmable power supply, in particular to an electrical characteristic testing device for a railway safety relay.
Background
The railway signal relay is a special electromagnetic switch device in various railway signal equipment or systems, and consists of an electromagnetic coil, a contact group, a transmission system and a component for ensuring the connection or disconnection of the contact. The main types of the relay are a direct current electrodeless relay, a polarization relay, a polarity holding relay and the like. When the coil is energized with a calibrated working current, the electromagnet is excited to drive the contact system, so that the front contact and the middle contact are closed, the coil is powered off or the current drops to a specified value, and the middle contact is disconnected from the front contact and closed with the rear contact by the elasticity of the contact reed and the gravity of the heavy hammer piece. The hammer piece is weighted to ensure the reliable closing or opening of the relay contact structurally. Gravity or spring gravity relays used for railway signals in circuits requiring fail-safe performance are called railway signal safety relays.
Railway signals serve as brains and nerves for commanding running, and the brain and the nerves play a very important role in railway transportation, and the safety relay is one of important executive components in a railway signal control system, and electrical characteristic parameters of the safety relay must be tested regularly in the processes of delivery and use. The main electrical parameters of the railway safety relay to be tested include: working value, release value, reverse working value, time characteristic, etc.; traditional relay test equipment integration level is low, the parameter discreteness is big, structural layout lacks the rationality, mostly adopt semi-automatic measurement or artifical manual measurement, precision and system reliability all are very poor, and some tests also adopt programmable power supply, but purchase programmable power supply cost is very high, and at present most measurement power supply still is through the artifical manual adjustment power supply measurement that voltage regulator and rectifier device constitute, and is intelligent, measurement accuracy and stability are lower.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide the device for testing the electrical characteristics of the railway safety relay, which has high precision, low cost and high reliability.
Therefore, the utility model aims to realize the purpose, and relates to an electrical characteristic testing device for a railway safety relay, which is characterized in that: the method comprises the following steps: the device comprises a processing unit, a power supply module, a display unit, a driving control module, an output module, a current expansion module, an acquisition module and a communication module; the output port of the processing unit is respectively and electrically connected with the input port of the driving control module and the display unit, is electrically connected with the railway safety relay through the acquisition module, and is electrically connected with the upper computer through the communication module; the power supply module supplies +15V, +5V, -5V power supplies required by the processing unit, the display unit, the driving control module, the output module, the current expansion module, the acquisition module and the communication module;
the power supply module converts an input alternating current power supply into a +15V, + 5V-5V power supply required by the whole power supply through a rectifier bridge, a voltage stabilizing circuit and a capacitor;
the communication module is used for receiving an instruction of the output voltage of the upper computer, the core processing unit calculates the voltage value to be output into internal control data, the control module is driven to output control voltage, and the control voltage is converted into the voltage to be output by the output module;
the acquisition module is used for acquiring the output voltage and current values in real time and comparing the acquired voltage and current values with set values to achieve higher-precision output;
the display unit is used for displaying the output voltage and current value in real time.
The processing unit adopts PIC16F 883.
The drive control module comprises an LTC1451 digital-to-analog conversion chip D1 and an operational amplifier OP-07, wherein a control terminal of the processing unit is electrically connected with a control terminal of an LTC1451 digital-to-analog conversion chip D1, the LTC1451 digital-to-analog conversion chip D1 is controlled by the processing unit to output voltages of 0 to 4.096V, the voltages of 0 to 4.096V output by the digital-to-analog conversion chip D1 are electrically connected with an input terminal of the operational amplifier OP-07, and the voltages are amplified by the OP-07 and electrically connected to the current expansion module.
The circuit schematic diagram output current expansion module of the output current expansion module comprises: LM317 and MJ4502, LM317 and MJ4502 are electrically connected, resistors R13 and R14 are connected between the emitter and the base of MJ4502 in parallel, the emitter of MJ4502 is 18V direct current voltage and used for controlling the starting voltage of MJ4502 and limiting the current passing through LM317, and most current of the power supply flows through the current amplifier MJ 4502; the OP-07 amplified signal is electrically connected to the ADJ terminal of the LM317, the output current of the LM317 is controlled, and the current is expanded through the Q1 MJ 4502.
And a radiator is fixed on the MJ 4502.
The operational amplifier OP-07 is electrically connected with resistors R9, R10, R11, R18 and R19 to form a subtraction circuit, R11 and R18 are respectively input resistors of 1K, the resistors R9 and R10 are electrically connected in series to form a voltage dividing resistor, one end of the resistor R9 is connected with a power supply VCC, the resistor R10 is grounded, an electric connection point is electrically connected with the negative phase input end of the operational amplifier OP-07 through a resistor R18, one end of the resistor R11 is electrically connected with the ground, the other end of the resistor R11 is electrically connected with the positive phase input end of the operational amplifier OP-07, the output of the operational amplifier OP-07 just offsets the output of 1.25V of the LM317, and the power supply realizes the output of 0-15V.
The input and output terminals of the LM317 include a diode, and the diode is used for protecting the LM 317.
The positive power supply of the operational amplifier OP-07 is connected with positive 15V, and the negative power supply of the operational amplifier OP-07 is connected with negative 5V.
The acquisition module comprises a voltage acquisition part and a current acquisition part, wherein the voltage acquisition part divides voltage through resistors R20 and R21, and is connected to a core processing unit D/A measurement interface after passing through a following circuit U5 and a low-pass filter circuit; the current acquisition part acquires voltages at two ends of R22 and R23 which are connected in parallel in a load loop of the output module, amplifies the small voltage by the operational amplifier circuit U6, and sends the amplified small voltage to the D/A measurement interface of the core processing unit after the band-pass filtering is carried out on the output end of the operational amplifier circuit U6.
The utility model has the beneficial effects that: the programmable power supply provided by the utility model can output a programmable direct-current power supply with the programming resolution of 0-15V and 0-5A reaching 5mV, provides a measuring power supply with low manufacturing cost, high precision, programmability and good stability for measuring the electrical characteristics of a current coil of a railway safety relay, and comprises a core processing unit, a power supply module, a display module, a control module, an output module, a current expansion module, an acquisition module, a communication module and the like. The direct current programmable power supply receives an instruction of voltage output by an upper computer through the communication module, the core processing unit calculates a voltage value to be output into internal control data, the control module is driven to output control voltage, the voltage value to be output is converted into the voltage to be output through the output module, the direct current programmable power supply acquires the output voltage and current value in real time through the acquisition module and compares the acquired voltage and current value with a set value, high-precision output is achieved, and meanwhile, the display unit displays the output voltage and current value in real time.
The present invention will be described in further detail below with reference to the accompanying drawings of embodiments.
Drawings
FIG. 1 is a functional block diagram of the present invention;
FIG. 2 is a schematic circuit diagram of the core processing unit of the present invention;
FIG. 3 is a circuit schematic of the control module of the present invention;
FIG. 4 is a circuit schematic of the output current spreading module of the present invention;
FIG. 5 is a circuit schematic of the acquisition module of the present invention;
FIG. 6 is a circuit schematic of the power module of the present invention;
FIG. 7 is a core processing unit software flow diagram of the present invention.
In the figure: 1. a processing unit; 2. a power supply module; 3. a display unit; 4. an upper computer; 5. a drive control module; 6. an output module; 7. a flow expansion module; 8. an acquisition module; 9. and a communication module.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the intended purpose, the following detailed description of the embodiments, structural features and effects of the present invention will be made with reference to the accompanying drawings and examples.
As shown in fig. 1, the utility model relates to an electrical characteristic testing device for a railway safety relay, which is characterized in that: the method comprises the following steps: the device comprises a processing unit 1, a power supply module 2, a display unit 3, a driving control module 5, an output module 6, a current expansion module 7, an acquisition module 8 and a communication module 9; the output port of the processing unit 1 is respectively and electrically connected with the input port of the driving control module 5 and the display unit 3, is electrically connected with the railway safety relay through the acquisition module 8, and is electrically connected with the upper computer 4 through the communication module 9; the power supply module 2 supplies +15V, +5V, -5V power supplies required by the processing unit 1, the display unit 3, the driving control module 5, the output module 6, the current expansion module 7, the acquisition module 8 and the communication module 9;
the power module 2 converts an input alternating current power supply into a +15V, +5V, -5V power supply required by the whole power supply through a rectifier bridge, a voltage stabilizing circuit and a capacitor;
the communication module 9 is used for receiving an instruction of the output voltage of the upper computer, the core processing unit calculates the voltage value to be output into internal control data, the control module 5 is driven to output the control voltage, and the output module 5 converts the control voltage into the voltage to be output;
the acquisition module 8 is used for acquiring the output voltage and current values in real time, and comparing the acquired voltage and current values with set values to achieve higher-precision output;
the display unit 3 is used for displaying the output voltage and current values in real time.
As shown in fig. 2 and 7, the processing unit 1 employs a PIC16F883, the PIC16F883 realizes functions such as data communication, analog quantity acquisition, data display, analog quantity output control and the like through a data bus and a control bus, a core processor starts a timer and a serial port function through system initialization, waits for receiving an instruction, performs analysis through the received instruction, and can perform functions such as starting output, stopping output, setting voltage, reading current and the like, meanwhile, the system enables a timing protection function in order to prevent a large current from burning the device, and when the output current is greater than 2A, if the time exceeds 3 minutes, the system automatically powers off.
As shown in fig. 3, the present invention provides a circuit diagram of a driving control module 5, the driving control module 5 includes an LTC1451 digital-to-analog conversion chip D1 and an operational amplifier OP-07, a control terminal of the processing unit 1 is electrically connected to a control terminal of the LTC1451 digital-to-analog conversion chip D1, the processing unit 1 controls the LTC1451 digital-to-analog conversion chip D1 to output voltages of 0 to 4.096V, the voltages of 0 to 4.096V output by the digital-to-analog conversion chip D1 are electrically connected to an input terminal of the operational amplifier OP-07, and the voltages are amplified by the OP-07 and electrically connected to the current expanding module 7.
As shown in fig. 4, the circuit schematic diagram of the output current spreading module 7 according to the present invention includes: LM317 and MJ4502, LM317 and MJ4502 are electrically connected, resistors R13 and R14 are connected in parallel between the emitter and the base of MJ4502, the emitter of MJ4502 is 18V direct current voltage and used for controlling the starting voltage of MJ4502 and limiting the current passing through LM317, most of the current of a power supply flows through a current amplifier MJ4502, therefore, a radiator is fixed on MJ4502, an OP-07 amplified signal is electrically connected to the ADJ end of LM317, the output current of LM317 is controlled, and the current is amplified through Q1 MJ 4502.
As shown in FIG. 3, in addition, because the lowest power supply that LM317 can output is 1.25V, can't meet the requirement of system 0-15V, form a subtraction circuit by resistance R9, R10, R11, R18, R19 and operational amplifier OP-07, R11 and R18 are the input resistance of 1K respectively, resistance R9 and R10 are connected electrically in series and form the divider resistance, resistance R9 connects VCC power supply, R10 is grounded, the electrical connection point is connected electrically with the negative phase input end of operational amplifier OP-07 through resistance R18, resistance R11 connects electrically with ground at one end, the other end is connected electrically with the non-inverting input end of operational amplifier OP-07. The output of the operational amplifier OP-07 just offsets the output of 1.25V of LM317, the power supply realizes the output of 0-15V, the diode in the circuit is used for protecting LM317, the positive power supply of the operational amplifier OP-07 is connected with positive 15V, the negative power supply of the operational amplifier OP-07 is connected with negative-5V.
As shown in fig. 5, the acquisition module 8 includes a voltage acquisition part and a current acquisition part, wherein the voltage acquisition part divides voltage through resistors R20 and R21, and is connected to the D/a measurement interface of the core processing unit after passing through a follower circuit U5 and a low-pass filter circuit; the current acquisition part acquires voltages at two ends of R22 and R23 which are connected in parallel in a load loop of the output module, amplifies the small voltage by the operational amplifier circuit U6, and sends the amplified small voltage to the D/A measurement interface of the core processing unit after the band-pass filtering is carried out on the output end of the operational amplifier circuit U6.
As shown in fig. 6, the power module 2 converts the input ac power into +15V, +5V, -5V power required by the whole power supply through a rectifier bridge, a voltage regulator circuit and a capacitor.
The working method of the utility model comprises the following procedures:
whether the interrupt is one of the steps 109, 200, 201, 202 and 203 is to the relevant interrupt program;
an interrupt step 109, starting output;
interrupting step 200, stopping output;
an interrupt step 201, setting a voltage;
step 209, if the power supply is in the on state, outputting the currently set voltage, if the power supply is in the off state, saving the currently set value to prepare for the next start, and returning to step 103.
An interrupt step 202, reading a voltage;
step 210, returning to the current voltage or current value, and returning to step 103;
an interrupt step 203, reading current;
and step 210, returning to the current voltage or current value, and returning to step 103.
The foregoing is a more detailed description of the utility model in connection with specific preferred embodiments and it is not intended that the utility model be limited to these specific details. For those skilled in the art to which the utility model pertains, several simple deductions or substitutions can be made without departing from the spirit of the utility model, and all shall be considered as belonging to the protection scope of the utility model.
Claims (9)
1. The utility model provides a be used for railway safety type relay electrical characteristic testing arrangement which characterized by: the method comprises the following steps: the device comprises a processing unit (1), a power module (2), a display unit (3), a driving control module (5), an output module (6), a current expansion module (7), an acquisition module (8) and a communication module (9); the output port of the processing unit (1) is respectively and electrically connected with the input port of the drive control module (5) and the display unit (3), is electrically connected with the railway safety relay through the acquisition module (8), and is electrically connected with the upper computer (4) through the communication module (9); the power supply module (2) supplies power of +15V, +5V and-5V required by the processing unit (1), the display unit (3), the driving control module (5), the output module (6), the current expanding module (7), the acquisition module (8) and the communication module (9).
2. The device for testing the electrical characteristics of the railway safety relay, as claimed in claim 1, wherein: the processing unit (1) adopts PIC16F 883.
3. The device for testing the electrical characteristics of the railway safety relay, as claimed in claim 1, wherein: the drive control module (5) comprises an LTC1451 digital-to-analog conversion chip D1 and an operational amplifier OP-07, a control terminal of the processing unit (1) is electrically connected with a control terminal of an LTC1451 digital-to-analog conversion chip D1, the LTC1451 digital-to-analog conversion chip D1 is controlled by the processing unit (1) to output voltages of 0 to 4.096V, the voltages of 0 to 4.096V output by the digital-to-analog conversion chip D1 are electrically connected with an input terminal of the operational amplifier OP-07, and the voltages are amplified by the OP-07 and electrically connected with the current expansion module (7).
4. The device for testing the electrical characteristics of the railway safety relay, as claimed in claim 1, wherein: the current spreading module (7) comprises: LM317 and MJ4502, LM317 and MJ4502 are electrically connected, resistors R13 and R14 are connected between the emitter and the base of MJ4502 in parallel, the emitter of MJ4502 is 18V direct current voltage and used for controlling the starting voltage of MJ4502 and limiting the current passing through LM317, and most current of the power supply flows through the current amplifier MJ 4502; the OP-07 amplified signal is electrically connected to the ADJ terminal of the LM317, the output current of the LM317 is controlled, and the current is expanded through the Q1 MJ 4502.
5. The device for testing the electrical characteristics of the railway safety relay, as claimed in claim 4, wherein: and a radiator is fixed on the MJ 4502.
6. The device for testing the electrical characteristics of the railway safety relay, as claimed in claim 3, wherein: the operational amplifier OP-07 is electrically connected with resistors R9, R10, R11, R18 and R19 to form a subtraction circuit, R11 and R18 are respectively input resistors of 1K, the resistors R9 and R10 are electrically connected in series to form a voltage dividing resistor, one end of the resistor R9 is connected with a power supply VCC, the resistor R10 is grounded, an electric connection point is electrically connected with the negative phase input end of the operational amplifier OP-07 through a resistor R18, one end of the resistor R11 is electrically connected with the ground, and the other end of the resistor R11 is electrically connected with the positive phase input end of the operational amplifier OP-07.
7. The device for testing the electrical characteristics of the railway safety relay, as claimed in claim 4, wherein: the input and output terminals of the LM317 include a diode.
8. The device for testing the electrical characteristics of the railway safety relay, as claimed in claim 3, wherein: the positive power supply of the operational amplifier OP-07 is connected with positive 15V, and the negative power supply of the operational amplifier OP-07 is connected with negative 5V.
9. The device for testing the electrical characteristics of the railway safety relay, as claimed in claim 1, wherein: the acquisition module (8) comprises a voltage acquisition part and a current acquisition part, wherein the voltage acquisition part divides voltage through resistors R20 and R21, and is connected to a D/A measurement interface of the core processing unit after passing through a following circuit U5 and a low-pass filter circuit; the current acquisition part acquires voltages at two ends of R22 and R23 which are connected in parallel in a load loop of the output module, and the output end of the operational amplifier circuit U6 is sent to the core processing unit after being subjected to band-pass filtering.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121497320.4U CN216052062U (en) | 2021-07-01 | 2021-07-01 | Be used for railway safety type relay electrical characteristic testing arrangement |
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| CN202121497320.4U CN216052062U (en) | 2021-07-01 | 2021-07-01 | Be used for railway safety type relay electrical characteristic testing arrangement |
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| CN216052062U true CN216052062U (en) | 2022-03-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466686A (en) * | 2021-07-01 | 2021-10-01 | 西安铁路信号有限责任公司 | Programmable power supply and method for testing electrical characteristics of railway safety relay |
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2021
- 2021-07-01 CN CN202121497320.4U patent/CN216052062U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466686A (en) * | 2021-07-01 | 2021-10-01 | 西安铁路信号有限责任公司 | Programmable power supply and method for testing electrical characteristics of railway safety relay |
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