Temperature conversion device accompanying test equipment

Abstract

The utility model discloses accompanying test equipment for a temperature conversion device, which comprises a main controller, the input end of the main controller is connected with a switching value input module, the output end of the main controller is connected with a multi-path switching module and a communication module, and the communication module is connected with an upper computer. The switching control circuit comprises a filtering unit, a voltage reversing unit, an optocoupler isolation unit and a relay, and the switch detection circuit is an optocoupler-based level conversion circuit; the device has a function of rapidly switching connection between one variable resistance box and eight temperature sampling circuits, can replace manual replacement of a test loop, improves the debugging efficiency of the temperature conversion device, and saves the number of the variable resistance boxes.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature sampling, in particular to a temperature conversion device accompanying test equipment. Background Art

[0002] Temperature converters are devices that convert the resistance signal of a temperature sensor into a voltage signal. They are widely used to monitor the temperature of stators, bearings, and power devices of generators or propulsion motors. Once the temperature of a key part exceeds a certain limit, the corresponding motor control device will sound an alarm and the motor will shut down urgently.

[0003] Usually, the temperature conversion device collects multiple temperature signals, such as the driven bearing temperature, non-driven bearing temperature, air inlet temperature, air outlet temperature, and stator temperature of the generator. There are two sensors for the driven bearing temperature, non-driven bearing temperature, and stator temperature respectively.

[0004] During the debugging process, in order to test the temperature converter circuit, a variable resistor box is generally used to simulate the changes in the temperature sensor. Under normal circumstances, 8 variable resistor boxes need to be connected to the temperature converter in sequence.

[0005] In this way, not only is the wiring complicated and space-consuming during debugging, but it is also necessary to find a corresponding variable resistance box, resulting in low testing efficiency. Utility Model Content

[0006] The purpose of the utility model is to provide a temperature conversion device test equipment, which has the function of quickly switching the connection between one variable resistance box and 8-way temperature sampling circuits, can replace manual replacement of test circuits, improves the efficiency of temperature conversion device debugging, and saves the number of variable resistance boxes.

[0007] The utility model solves the technical problem by adopting the following technical solution: a temperature conversion device test equipment, comprising a main controller, the input end of the main controller is connected to a switch quantity input module, the output end of the main controller is connected to a multi-way switching module, the multi-way switching module has the same number of switching control circuits as the temperature sampling circuit in the temperature conversion device, the switching control circuit comprises a filtering unit, a voltage reversing unit, an optocoupler isolation unit and a relay, the switch quantity input module has the same number of switch detection circuits as the switching control circuit, the switch detection circuit is a level conversion circuit based on optocouplers, the output end of the main controller is also connected to a communication module, and the communication module is connected to a host computer.

[0008] Furthermore, the main controller is a DSP chip. When the number of temperature sampling circuits in the temperature conversion device is 8, the multi-way switching module is composed of 8 groups of identical switching control circuits, and the switch input module is composed of 8 groups of identical switch detection circuits.

[0009] Furthermore, the switching control circuit and the switch detection circuit both use TLP291 photocoupler.

[0010] Furthermore, the main controller adopts a TMS320F2812PGF digital signal processing chip.

[0011] Furthermore, the communication module adopts the SN65HVD232 chip.

[0012] The beneficial effects of the utility model are:

[0013] 1. This equipment reduces the number of 8 variable resistance boxes to 1, saving the number of variable resistance boxes, while saving equipment space and simplifying line wiring.

[0014] 2. This device is easy to operate. You only need to click the switch button on the host computer to switch it with one key, so that the variable resistance box is connected to the corresponding temperature sampling circuit, which greatly improves the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the switching control circuit of the utility model;

[0017] Figure 3 This is the principle diagram of the switch detection circuit of the utility model;

[0018] Figure 4 This is a circuit schematic diagram of the communication module of the utility model;

[0019] Figure 5 This is the circuit schematic diagram of the main controller of the utility model;

[0020] Figure 6 This is a working diagram of the main controller of the utility model.

[0021] The reference numerals of the figures are: 1—multi-way switching module, 2—switch input module, 3—main controller, 4—communication module, 5—host computer. Implementation

[0022] The implementation of the present invention is further described below with reference to specific examples and drawings.

[0023] Reference Figure 1As shown, the utility model discloses a temperature conversion device test equipment, which includes a multi-way switching module 1, a switch input module 2, a main controller 3, a communication module 4, and a host computer 5. The multi-way switching module 1 has the same number of switching control circuits as the temperature sampling circuit in the temperature conversion device. The switching control circuit is mainly divided into four parts, namely a filter unit, a voltage reversal unit, an optocoupler isolation unit and a relay. The switch input module 2 has the same number of switch detection circuits as the switching control circuit. The dotted box in the figure shows the various modules of the test equipment. A variable resistance box outside the dotted box is used to simulate a temperature sensor, which is connected to the relay interface of the switching control circuit in the multi-way switching module 1. The temperature conversion device outside the dotted box is the tested device, which is also connected to the relay interface in the switching control circuit.

[0024] The main controller 3 is a DSP chip, and its pins GPIOA0-GPIOA7 are identical to the 8 switch detection circuits in the switch input module 2 ( Figure 3 ) output port connection, for a single switch detection circuit, Figure 3 The corresponding PWM1 terminal; its pins GPIOB0-GPIOB7 are the same as the 8 switching control circuits in the multi-channel switching module 1 ( Figure 2 ) input port connection, in Figure 2 The corresponding PWM7 terminal; its pins GPIOF6 and GPIOF7 are connected to the communication module 4 ( Figure 3 ) Input ports CANTX and CANRX are connected, terminals CANH and CANL of communication module 4 are connected to host computer 5, and the software of host computer 5 is designed based on C#Winform. Preferably, the switching control circuit and switch detection circuit both use TLP291 photoelectric coupler.

[0025] As a specific embodiment, the number of temperature sampling circuits in the temperature conversion device is 8, and the multi-way switching module 1 is composed of Figure 2 The shown figure is composed of 8 groups of identical switching control circuits, and the 8 groups of switching control circuits correspond to 8 temperature sampling circuits in sequence, which are used for driving shaft 1 temperature sampling, driving shaft 2 temperature sampling, non-driving shaft 1 temperature sampling, non-driving shaft 2 temperature sampling, air inlet temperature sampling, air outlet temperature sampling, stator 1 temperature sampling, and stator 2 temperature sampling respectively. The 8 temperature sampling circuits are located in the test equipment, namely the temperature conversion device.

[0026] The multi-way switching module 1 is composed of 8 groups of identical switching control circuits. Figure 2 What is shown is a single switching control circuit corresponding to the temperature of the drive shaft 1, whose circuit input terminal PWM7 is connected to GPIOB0 of the DSP chip, and the connection of the other 7 switching control circuits is that the terminals at the same position of the input terminal PWM7 are connected to GPIOB1-GPIOB7 in sequence. Figure 2 The output end of the circuit is the 6 pins of the K1 relay, which are d1, d2, t1+, t1-, DAX+, and DAX-. The d1 and d2 terminals are connected to the variable resistance box, and the d1 and d2 terminals corresponding to the other 7 circuits are also connected to the same resistance box. DAX+ and DAX- are connected to the temperature sampling circuit of the drive shaft 1 of the test equipment as inputs, and the connections of the other 7 switching control circuits are Figure 2 The terminals at the same position as DAX+ and DAX- are connected to the corresponding sampling circuits. t1+ and t1- are used as switch detection circuits ( Figure 3 ), t1+ is connected to t1 of the switching control circuit, t1- is connected to GND, and t1+ and t1- corresponding to the other 7 switching control circuits are connected to the input terminal t1 of the switch detection circuit corresponding to the number. On the one hand, the switching control circuit can close the relay in the circuit after receiving the switch signal of the DSP2812 chip, so that the variable resistance box of the analog temperature sensor is connected to the corresponding temperature sampling circuit of the test device, and the test of the test device, i.e., the temperature conversion device, is realized. On the other hand, the output line of the relay in the switching control circuit is used as the input of the switch input module 2. Once the relay is closed, a closing signal is sent to the circuit in the switch input module 2. When a certain sampling is required to connect the variable resistance box, the circuit input terminal is set to a low level, and the low level is converted to a high level through the inverter. The high level signal drives the connected transistor Q5, so that the optocoupler isolation unit is activated, and the output end of the optocoupler isolation unit forms a loop. Finally, the relay is turned on, and the three groups of coils of the relay are in a closed state.

[0027] The switch input module 2 is composed of 8 groups of identical switch detection circuits. Figure 3 The single switch detection circuit corresponding to the temperature of the drive shaft 1 is shown. The output terminal PWM1 of the circuit is connected to the GPIOA0 of the DSP chip. The connection of the other 7 circuits is that the terminals at the same position of the input terminal PWM1 are connected to GPIOA1-GPIOA7 in sequence, corresponding to 8 groups of switching control circuits. It can convert the received switching quantity into a level and transmit it to the main controller 3, i.e., the DSP2812 chip, and finally transmit it to the host computer 5 by the DSP2812 chip, thereby indicating which sampling circuit of the temperature conversion device the current variable resistance box is connected to. The switch detection circuit is a level conversion circuit based on an optocoupler. The input signal of the switch detection circuit is taken from the relay output t1+ and t1- in the switching control circuit. t1+ is connected to t1 of the switching control circuit, and t1- is connected to GND. When the relay in the switching control circuit is closed, the optocoupler in the switch detection circuit is turned on, and finally a low level is output to the main controller 3.

[0028] Preferably, the communication module 4 uses a SN65HVD232 chip. Figure 4As shown, the communication module 4 is a 3.3V CAN transceiver produced by Texas Instruments, which is suitable for serial communication of CAN bus with high communication rate, good anti-interference ability and high reliability. It is mainly used in conjunction with DSP with CAN controller. The transceiver has differential transceiver capability and the maximum rate can reach 1Mb / s.

[0029] Preferably, the main controller 3 uses a TMS320F2812PGF digital signal processing chip. Figure 5 As shown, the main controller 3 adopts TMS320F2812PGF digital signal processing chip. When exercising the state detection function: read the 8-way switch quantity signal in the switch quantity input module 2, obtain the current connection status of the variable resistance box with each temperature sampling circuit, and send the signal to the host computer 5 through the communication module 4 for display; when exercising the circuit control function: receive the instruction of the host computer 5 through the communication module 4, output the switch quantity to the switching control circuit corresponding to a certain temperature sampling in the multi-way switching module 1, trigger the relay K1 in the switching control circuit to close, so that the variable resistance box of the simulated temperature sensor is connected to the corresponding temperature sampling circuit of the tested device, and the tested device is tested.

[0030] Figure 5 The system also includes a crystal oscillator circuit and a reset circuit. The crystal oscillator circuit uses an external 30MHZ active crystal oscillator. After pressing the REST button in the reset circuit, the system can enter the reset state.

[0031] Figure 6 This is the workflow diagram of the main controller 3. First, perform system initialization operations, including hardware initialization, software parameter setting, etc. In addition, set the input of the 8-way switching control circuit to a high level, that is, all sampling circuits are disconnected from the variable resistance box. Then, enter the loop, read the CAN communication data, and determine whether the instruction of connecting a sampling circuit of the tested device to the variable resistance box is received: if the instruction is not received, detect the state of the 8-way switch quantity, and send the CAN data, and transmit the collected state of the 8-way switch quantity input signal to the host computer 5, showing the user which sampling circuit is currently connected to the variable resistance box; if the instruction is received, the corresponding port of the main controller 3 outputs a low level to the switching control circuit corresponding to a temperature sampling in the multi-way switching module 1, triggering the relay K1 in the switching control circuit to close, so that the variable resistance box of the simulated temperature sensor is connected to the corresponding temperature sampling circuit of the tested device, and the test of the tested device is realized. Subsequently, the state of the 8-way switch quantity is detected again, and the state of the collected 8-way switch quantity input signal is transmitted to the host computer, showing the user which sampling circuit is currently connected to the variable resistance box.

[0032] When the accompanying test equipment with the above structure is used, it is first necessary to connect one side of the 8 switching control circuit relays of the multi-way switching module 1 to a variable resistance box, and the other side is connected to the input of the 8 sampling circuits corresponding to the number of the tested equipment. In addition, the closed state signal of the 8 switching control circuit relays is connected to the input of the 8 switch detection circuits in the signal input module corresponding to the number, and the main controller 3 is connected to the host computer 5 through the communication module 4. After the power of the equipment is turned on, the communication is started on the host computer 5. The host computer 5 will display the connection status of each sampling circuit of the tested equipment and the variable resistance box. Click a temperature sampling circuit connection button. At this time, the host computer 5 will display that the temperature sampling circuit has been connected to the variable resistance box, and other circuits are disconnected from the variable resistance box, and the debugging of the tested equipment can be started. After debugging this temperature sampling circuit, directly select the next temperature sampling circuit connection button on the host computer 5, and the main controller 3 automatically disconnects the relay that was closed last time, and then repeats the above closing operation, so that each circuit does not interfere with each other, which greatly improves the debugging efficiency of the equipment.

[0033] The above embodiments are only illustrative of the principle and efficacy of the present invention, as well as some embodiments of its application. A person skilled in the art may make several modifications and improvements without departing from the inventive concept of the present invention, and all of these belong to the protection scope of the present invention.

Claims

1. A temperature conversion device test equipment, characterized in that: The invention comprises a main controller (3), wherein the input end of the main controller (3) is connected to a switch quantity input module (2), and the output end of the main controller (3) is connected to a multi-way switching module (1). The multi-way switching module (1) has the same number of switching control circuits as the temperature sampling circuit in the temperature conversion device, and the switching control circuit comprises a filtering unit, a voltage inversion unit, an optical coupling isolation unit and a relay. The switch quantity input module (2) has the same number of switch detection circuits as the switching control circuit, and the switch detection circuit is a level conversion circuit based on optical coupling. The output end of the main controller (3) is also connected to a communication module (4), and the communication module (4) is connected to a host computer (5).

2. A temperature conversion device test equipment according to claim 1, characterized in that: The main controller (3) is a DSP chip, the multi-channel switching module (1) is composed of 8 groups of identical switching control circuits, and the switch quantity input module (2) is composed of 8 groups of identical switch detection circuits.

3. A temperature conversion device test equipment according to claim 1 or 2, characterized in that: The switching control circuit and the switch detection circuit both use TLP291 photocoupler.

4. A temperature conversion device test equipment according to claim 3, characterized in that: The main controller (3) adopts a TMS320F2812PGF digital signal processing chip.

5. A temperature conversion device test equipment according to claim 4, characterized in that: The communication module (4) adopts the SN65HVD232 chip.

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