CN107422253B - Circuit board detection device - Google Patents
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- CN107422253B CN107422253B CN201710884978.2A CN201710884978A CN107422253B CN 107422253 B CN107422253 B CN 107422253B CN 201710884978 A CN201710884978 A CN 201710884978A CN 107422253 B CN107422253 B CN 107422253B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/2806—Apparatus therefor, e.g. test stations, drivers, analysers, conveyors
- G01R31/2808—Holding, conveying or contacting devices, e.g. test adapters, edge connectors, extender boards
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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Abstract
The invention discloses a circuit board detection device, which comprises a stepping motor detection interface, a waveform shaping circuit, a controller, a fan detection interface and a relay, wherein the stepping motor detection interface is connected with the waveform shaping circuit; n pins of the stepper motor detection interface respectively receive N paths of pulse signals output by the stepper motor driving circuit, the N paths of pulse signals are sent to the controller through the N paths of waveform shaping circuits, and the controller judges whether the stepper motor driving circuit fails or not according to the received N paths of pulse signals; the fan detection interface comprises two power supply pins and a feedback pin; the coil of the relay is connected between two power supply pins of the fan detection interface, and the normally open contact of the relay is connected between a feedback pin of the fan detection interface and a pulse signal output pin of the controller. The circuit board detection device is connected to the circuit board to be detected, and a stepping motor and a fan are not required to be assembled on the circuit board, so that a fault detection task can be completed for a stepping motor driving circuit and a fan driving circuit on the circuit board.
Description
Technical Field
The invention belongs to the technical field of circuit board detection tools, and particularly relates to a device for detecting faults of a stepping motor driving circuit and a fan driving circuit on a circuit board.
Background
After the circuit board (circuit board) in the electronic product is processed and manufactured on the production line body, fault detection is required to be carried out on each part of functional circuits on the circuit board so as to select qualified products in the circuit board to be put in storage or to be transferred into the next-stage production line body for the assembly or welding operation of controlled loads.
At present, fault detection on circuit boards on a production line body generally adopts the following two modes:
one is a manual detection mode. Namely, by adopting a manual measurement mode and through manual subjective analysis, whether the circuit board has faults or not is judged. The detection mode is complicated to operate, long in detection time and easy to misreport by workers, the reject ratio of products is increased, difficulties are brought to production and maintenance, and the detection speed is low, so that a large amount of products of a production line are backlogged, and the production efficiency is affected.
The other is an intelligent tool detection mode. Namely, the circuit board on the production line body is connected to the intelligent tool, each functional circuit on the circuit board is controlled by the intelligent tool to sequentially drive a controlled load connected with the circuit board to be started, and whether each functional circuit on the circuit board is normal or not is judged by observing the running condition of the controlled load. Taking a main control board in a refrigerator product as an example for explanation, a throttle driving circuit for controlling the opening or closing of a throttle and a fan driving circuit for controlling the operation of a fan are generally arranged on the main control board of the refrigerator. When the air door driving circuit and the fan driving circuit on the main control board of the refrigerator are subjected to fault detection, the stepping motor for driving the air door switch and the fan are connected to the main control board, namely, are correspondingly connected with the air door driving circuit and the fan driving circuit respectively; then, the intelligent tool is communicated with a processor on the main control board, and a control instruction is output to the air door driving circuit and the fan driving circuit through the processor, so that the stepping motor and the fan are driven to operate. If the stepping motor and the fan normally operate, the air door driving circuit and the fan driving circuit on the main control board are normal; otherwise, it is determined that there is a fault. According to the traditional tool detection mode, the controlled load is required to be connected to the circuit board to be detected to finish the fault detection task of the circuit board, so that the risk of damage of the controlled load caused by the fault of the circuit board exists, and the problems of increased loss rate of the controlled load, increased detection cost and the like are caused easily.
Disclosure of Invention
The invention provides a circuit board detection device aiming at a stepping motor driving circuit and a fan driving circuit on a circuit board, which can detect faults of the part of functional circuits on the circuit board without connecting a stepping motor and a fan to the circuit board and obtain accurate detection results.
In order to solve the technical problems, the invention is realized by adopting the following technical scheme:
a circuit board detection device, wherein a stepping motor driving circuit and a fan driving circuit are arranged on the circuit board; the stepping motor driving circuit outputs N paths of pulse signals for driving the stepping motor to rotate forwards or reversely; the fan driving circuit outputs direct current power for driving the fan to operate; the detection device is provided with a stepping motor detection interface, an N-path waveform shaping circuit, a controller, a fan detection interface and a relay; the stepping motor detection interface comprises N pins for receiving the N paths of pulse signals; the N paths of waveform shaping circuits are connected with the N pins of the stepping motor detection interface in a one-to-one correspondence manner, and respectively perform shaping treatment on the N paths of pulse signals; the controller receives the N paths of pulse signals after shaping processing, judges whether the stepping motor driving circuit is faulty according to the N paths of pulse signals after shaping processing, and generates a fault detection result; the fan detection interface comprises two power supply pins for receiving the direct current power supply output by the fan driving circuit and a feedback pin for feeding back PWM signals to the fan driving circuit; the coil of the relay is connected between the two power supply pins of the fan detection interface, and the normally open contact of the relay is connected between the feedback pin of the fan detection interface and one path of PWM signal output pin of the controller.
Further, the N pulse signals are preferably N pulse sequences, N is greater than or equal to 2, and the controller judges whether the stepper motor driving circuit fails according to the time sequence of the received N pulse sequences.
Preferably, the step motor driving circuit is designed to output an N-way pulse sequence for driving the step motor to rotate forward in a specified forward rotation time period and output an N-way pulse sequence for driving the step motor to rotate reversely in a specified reverse rotation time period; the controller judges that the stepping motor driving circuit is normal if the controller detects that the time sequence of the N paths of pulse sequences received by the controller is a forward rotation time sequence in a specified forward rotation time period and the time sequence of the N paths of pulse sequences received by the controller is a reverse rotation time sequence in a specified reverse rotation time period; otherwise, judging that the stepping motor driving circuit is faulty.
Further, a processor for controlling the operation of the stepping motor driving circuit is arranged on the circuit board, and in order to enable the detection device and the circuit board to operate in a coordinated manner, the controller is designed to communicate with the processor, and the processor is controlled to enter a fault detection process of the stepping motor driving circuit; and after entering a fault detection process of the stepping motor driving circuit, the processor controls the stepping motor driving circuit to output a pulse sequence with a specific time sequence within a specified time period, namely, the processor executes a sending and time sequence detection process of the pulse sequence.
Preferably, the stepper motor detection interface comprises 4 pins for receiving the pulse signals, and the pins are a first pin, a second pin, a third pin and a fourth pin in sequence; the first inductor is bridged between the first pin and the second pin, the second inductor is bridged between the third pin and the fourth pin, and the winding in the stepping motor is imitated by the inductor so as to simulate the transmission environment of pulse signals in the stepping motor, and then a more accurate fault detection result is obtained.
As a preferable circuit design of the waveform shaping circuit, the invention is provided with a voltage dividing circuit, a clamping circuit and a current limiting resistor in each path of waveform shaping circuit, the pulse signals of each path are reduced in voltage by the voltage dividing circuit and limited by the clamping circuit, and then transmitted to the controller through the current limiting resistor, and the controller correspondingly receives N paths of pulse signals processed by the waveform shaping circuit through N paths of I/O ports of the controller so as to conveniently judge pulse time sequences.
Preferably, two series voltage dividing resistors are preferably arranged in the voltage dividing circuit and are connected between the pins of the stepper motor detection interface and the ground; the clamping circuit is preferably provided with two diodes which are connected in series in the forward direction, the cathodes of the two diodes are connected with a direct current power supply after being connected in series, the anodes of the two diodes are grounded, the middle nodes of the two diodes are connected with the middle nodes of two voltage dividing resistors, and the two diodes are connected with the controller through the current limiting resistor.
Further, when the fan driving circuit on the circuit board is subjected to fault detection, the fan driving circuit is controlled by a processor on the circuit board to deliver direct current to two power supply pins of the fan detection interface, and the PWM signals fed back by the feedback pins are waited to be received; and if the processor receives the fed-back PWM signal, judging that the fan driving circuit is normal, otherwise, judging that the fan driving circuit is faulty.
Preferably, the detection result of whether the fan driving circuit has a fault can be generated in the following two ways:
one is that a processor on a circuit board is directly utilized to generate a fault detection result and feed the fault detection result back to the controller;
the other is that the processor on the circuit board is designed to output a feedback signal to the controller after receiving the PWM signal; and if the controller receives the feedback signal within a set time, judging that the fan driving circuit is normal, otherwise, judging that the fan driving circuit is faulty, and generating a fault detection result.
In order to enable line body workers to intuitively see the fault detection result, the detection device is further provided with a display module which is connected with the controller, the controller generates a fault code according to the fault detection result, and the fault code is output and displayed through the display module so as to reduce the false alarm rate.
Compared with the prior art, the invention has the advantages and positive effects that: the circuit board detection device provided by the invention has the advantages that the structure is simple, the operation is easy, the circuit board detection device is connected to the circuit board to be detected, and the fault detection task of the stepping motor driving circuit and the fan driving circuit on the circuit board can be completed without assembling the stepping motor and the fan on the circuit board. Therefore, the risk of damage to the stepping motor and the fan caused by the fault of the circuit board can be avoided, the controlled load is protected, the detection cost is reduced, and the assembly and disassembly steps of the controlled load are omitted, so that the operation steps are simplified, and the fault detection efficiency is improved. In addition, the circuit board detection device can directly generate and display the fault code of the detected fault, thereby reducing the professional knowledge requirement on fault detection personnel and solving the problem of easy false alarm of manpower.
Other features and advantages of the present invention will become more apparent from the following detailed description of embodiments of the present invention, which is to be read in connection with the accompanying drawings.
Drawings
FIG. 1 is a schematic circuit diagram of an embodiment of a circuit board inspection device according to the present invention;
FIG. 2 is a flow chart of fault detection of a stepper motor drive circuit on a circuit board using the circuit board detection device shown in FIG. 1;
FIG. 3 is a flow chart of fault detection of a fan drive circuit on a circuit board using the circuit board detection device shown in FIG. 1.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
As shown in fig. 1, the circuit board detection device of the present embodiment is mainly used for detecting faults of a stepper motor and a driving circuit of a fan (or fan) with a rotation speed feedback function, and includes a motor driving detection module and a fan driving detection module. The motor driving detection module is provided with a stepping motor detection interface J11, a waveform shaping circuit and other main components, and the controller MCU in the detection device can be matched to realize fault detection on the stepping motor driving circuit on the circuit board. The fan drive detection module is provided with a fan detection interface J21, a relay K1 and other main components, and the controller MCU can complete the fault detection task of the fan drive circuit on the circuit board.
Because the current stepping motor is controlled to rotate according to the received multipath pulse signals. The pulse signals are usually multi-path pulse sequences with different time sequences, and the forward and backward rotation control of the stepping motor can be realized by changing the front and back time sequences of each path of pulse sequences, so that the steering of the stepping motor can be changed. The circuit board provided with the stepping motor driving circuit is often provided with a plug interface (or a stepping motor interface) for externally connecting with the stepping motor, and the stepping motor driving circuit outputs the multipath pulse signals to the stepping motor through the plug interface so as to realize the control of the stepping motor.
In order to complete the fault detection task of the stepper motor driving circuit on the circuit board without using a stepper motor, the embodiment sets a stepper motor detection interface J11 in the motor driving detection module for connecting with the stepper motor interface on the circuit board to receive the multipath pulse signals output by the stepper motor driving circuit, and then judges whether the stepper motor driving circuit has a fault according to the multipath pulse signals received, thereby completing the fault detection task of the stepper motor driving circuit on the circuit board without connecting the stepper motor to the circuit board to be detected, and achieving the purposes of protecting the stepper motor and simplifying the fault detection operation.
Specifically, a plurality of pins are provided in the stepper motor detection interface J11, and each pin is used for receiving a pulse signal output by the stepper motor driving circuit and used for driving the stepper motor to rotate forward or backward. In order to allow for different types of stepper motors, in this embodiment, 4 pins for receiving the pulse signals are preferably provided in the stepper motor detection interface J11, and the pins are respectively a first pin c1, a second pin c2, a third pin c3 and a fourth pin c4, so that at most 4 paths of pulse signals can be received, and the fault detection requirements of multiple stepper motor driving circuits such as a two-phase four-wire stepper motor, a four-phase five-wire or a four-phase six-wire stepper motor can be met. In this embodiment, each of the pins c1-c4 is connected to a waveform shaping circuit, so as to perform shaping processing on the waveform of the received pulse signal, so as to eliminate the interference introduced by the pulse signal in the transmission process. And transmitting the pulse signals after the shaping processing to the controller MCU for time sequence judgment, so that the accuracy of a fault detection result can be improved.
As a preferable circuit design scheme of the waveform shaping circuit, the present embodiment is provided with a voltage dividing circuit, a clamp circuit and a current limiting resistor in the waveform shaping circuit connecting each of the pins c1 to c 4. Taking the waveform shaping circuit of the connection pin c4 as an example, as shown in fig. 1, multiple voltage dividing resistors may be disposed in the voltage dividing circuit, and the voltage dividing resistors are used for performing voltage dividing transformation on the voltage amplitude of the received pulse signal, so as to meet the receiving requirement of the controller MCU on the input signal. Taking the setting of two voltage dividing resistors R102 and R104 as an example for explanation, after the two voltage dividing resistors R102 and R104 are connected in series, one end of the voltage dividing resistor is connected to the pin c4 of the stepper motor detection interface J11, the other end of the voltage dividing resistor is grounded, and the intermediate node of the two voltage dividing resistors R102 and R104 is connected to the clamping circuit to output the pulse signal after voltage division. Two diodes D21 and D22 connected in series in the forward direction can be arranged in the clamping circuit, the cathode of the diode D21 is connected to a direct current power supply, such as a +5V direct current power supply, the anode is connected with the cathode of the diode D22 and is connected with the intermediate node of the voltage dividing resistors R102 and R104, and the anode of the diode D22 is grounded, so that the voltage amplitude of the pulse signal can be limited to be between 0 and 5V. The intermediate nodes of the two diodes D21 and D22 are connected to the controller MCU through a current limiting resistor R103, for example, one path of I/O ports A2+ of the controller MCU is connected to transmit pulse signals after voltage division and limit processing to the controller MCU. The controller MCU utilizes four paths of I/O ports A < 2+ >, B < 2+ > to respectively receive four paths of pulse signals which are introduced through four pins c1-c4 of a stepping motor detection interface J11 and are respectively processed by 4 paths of waveform shaping circuits. The voltage dividing resistors R105 and R107, the diodes D23 and D24 and the current limiting resistor R106 form a waveform shaping circuit of the connection pin c 3; the voltage dividing resistors R108 and R110, the diodes D25 and D26 and the current limiting resistor R109 form a waveform shaping circuit of the connection pin c 2; the voltage dividing resistors R111, R113, the diodes D27, D28, and the current limiting resistor R112 constitute a waveform shaping circuit of the connection pin c 1. The controller MCU judges whether the received pulse signals are pulse sequences for controlling the forward rotation of the stepping motor or pulse sequences for controlling the reverse rotation of the stepping motor according to the time sequence of the received four paths of pulse signals, and compares the pulse sequences with the control target which is actually expected to be achieved by the circuit board to be tested, if the pulse sequences are consistent, the driving circuit of the stepping motor on the circuit board can be judged to be normal; if the fault is inconsistent, the fault of the stepping motor driving circuit on the circuit board can be judged, then a fault detection result, such as a fault code and the like, is generated through the controller MCU, and is output and displayed through a display module P1 (such as a nixie tube, a liquid crystal screen and the like) connected with the controller MCU, so that the fault detection result is clear at a glance, and the problem of easiness in false alarm caused by manpower is solved.
In order to further improve the accuracy of the fault detection result of the stepper motor driving circuit, the present embodiment further provides two inductors L3 and L4 in the motor driving detection module, as shown in fig. 1. The first inductor L4 is connected between a first pin c1 and a second pin c2 of the stepper motor detection interface J11 in a bridging mode; the second inductor L3 is bridged between the third pin c3 and the fourth pin c4 of the stepper motor detection interface J11, the pins c1, c2, c3 and c4 are sequentially arranged in the stepper motor detection interface J11, two windings in the stepper motor are imitated by the inductors L3 and L4 and are connected to the connecting positions corresponding to the two windings in the stepper motor, so that the transmission environment of pulse signals in the stepper motor can be simulated, the pulse signals received by the controller MCU are more similar to the pulse sequences received by the main control board in the stepper motor, and the controller MCU is more beneficial to generating accurate fault detection results.
In the circuit board detection device of this embodiment, a plurality of groups of motor driving detection modules may be provided, so as to be used for simultaneously performing fault detection on multiple paths of stepping motor driving circuits arranged on the circuit board, thereby improving fault detection efficiency. Fig. 1 shows a situation that two groups of motor driving detection modules are arranged, wherein J12 is a stepper motor detection interface in the second group of motor driving detection modules, divider resistors R90/R92, R93/R95, R96/R98, R99/R101, diodes D13/D14, D15/D16, D17/D18, D19/D20 and current limiting resistors R91, R94, R97, R100 form another four-way waveform shaping circuit, and four pins c1-c4 for receiving four-way pulse signals in the second stepper motor detection interface J12 are respectively connected with other four-way I/O ports a1+, A1-, b1+, B1-of the controller MCU, and two inductors L1 and L2 are respectively connected between pins c3 and c4 and pins c1 and c2 of the second stepper motor detection interface J12 in a bridging manner so as to realize fault detection of the second stepper motor driving circuit.
The circuit board detection device is applied to a production line body of a main control board of a refrigerator, and two groups of motor drive detection modules distributed in the detection device are matched with a controller MCU, so that fault detection can be carried out on one or two air door drive circuits on the main control board of the refrigerator.
The following describes in detail the fault detection process of the stepper motor driving circuit in combination with the circuit structure design of the circuit board detection device shown in fig. 1. As shown in fig. 2, the method comprises the following steps:
s201, connecting a stepping motor detection interface J11 and/or J12 on the circuit board detection device to a stepping motor interface (or a throttle interface) of a stepping motor driving circuit (or a throttle driving circuit) on the circuit board to be detected, and enabling a controller MCU on the detection device to be communicated with a processor on the circuit board to be detected;
s202, a control instruction for entering a fault detection process of a driving circuit of a stepping motor is sent to a processor on a circuit board to be detected through a controller MCU on a detection device;
s203, after a processor on a circuit board to be tested enters a fault detection process of the stepping motor driving circuit, the processor controls the stepping motor driving circuit to output four pulse sequences for driving the stepping motor to rotate forward in a preset forward rotation time period, and then controls the stepping motor driving circuit to output four pulse sequences for driving the stepping motor to rotate reversely in a preset reverse rotation time period;
in this embodiment, if the stepper motor driving circuit can correctly output the pulse sequence of the forward rotation and reverse rotation time sequences under the control of the processor, the stepper motor driving circuit is considered to be normal;
s204, after the controller MCU in the detection device controls the circuit board to be detected to enter a fault detection process of the stepping motor driving circuit, waiting for receiving four paths of pulse signals in the preset forward rotation time period, detecting whether the time sequence of the received four paths of pulse signals is a forward rotation time sequence, waiting for receiving other four paths of pulse signals in the preset reverse rotation time period, and detecting whether the time sequence of the other four paths of pulse signals is a reverse rotation time sequence;
s205, if the controller MCU in the detection device receives the pulse sequence of the forward rotation time sequence in a preset forward rotation time period and receives the pulse sequence of the reverse rotation time sequence in a preset reverse rotation time period, judging that the stepping motor driving circuit on the circuit board is normal; otherwise, judging that the stepping motor driving circuit on the circuit board fails;
s206, a controller MCU in the detection device generates a fault detection result, drives a display module P1 to output the detection result, and displays a fault code and indicates a fault position when the existence of a fault is detected;
s207, after the fault detection task is completed, a controller MCU in the detection device sends an instruction to a processor on the circuit board to be detected, and the processor on the circuit board to be detected is controlled to exit the fault detection process of the stepping motor driving circuit.
The embodiment has been specifically described by taking the motor driving detection module that receives four paths of pulse signals and the fault detection method thereof as an example, and the stepping motor driving circuit that needs to output other numbers of pulse signals can be specifically designed according to the circuit and control flow design manner of the embodiment, and the embodiment is not limited to the above example.
In the embodiment, the circuit board detection device is further provided with a fan driving detection module which can replace a fan with a rotating speed feedback function to complete the fault detection task of a driving circuit of the fan.
For the current fan with the rotating speed feedback function, besides the direct current power supply, a path of PWM signal can be fed back to the fan driving circuit, and the current rotating speed of the fan can be calculated by detecting the duty ratio of the PWM signal. For the fan driving circuit corresponding to the fan, in this embodiment, a fan detection interface J21 is provided in the fan driving detection module, as shown in fig. 1, and specifically includes three pins, two power supply pins d1 and d3 and a feedback pin d2. The power supply pins d1 and d3 are used for receiving direct current power output by the fan driving circuit, a coil of the relay K1 is connected between the power supply pins d1 and d3, a movable contact of the relay K1 is connected between one PWM signal output pin PWM1 of the controller MCU and a feedback pin d2 of the fan detection interface J21, when the fan driving circuit on the circuit board to be tested can normally output direct current power required by the fan, the coil of the relay K1 is electrified to control the normally open contact to be attracted, at the moment, PWM signals output by the controller MCU are sent to the fan driving circuit through the normally open contact of the relay K1 and the feedback pin d2 of the fan detection interface J21, and if the fan driving circuit receives the PWM signals, the fan driving circuit is judged to be normal; otherwise, judging that the fan driving circuit is faulty.
In this embodiment, the two ends of the coil of the relay K1 may be further connected with a diode D10 in parallel, and a current limiting resistor R83 may be further connected in series between the normally open contact of the relay K1 and the PWM signal output pin PWM1 of the controller MCU, so as to improve the stability of the operation of the fan driving detection module.
The following describes in detail the failure detection process of the fan driving circuit with reference to the circuit structural design of the circuit board detection device shown in fig. 1. As shown in fig. 3, the method comprises the following steps:
s301, connecting a fan detection interface J21 on the circuit board detection device to a fan interface of a fan driving circuit on the circuit board to be detected, and enabling a controller MCU on the detection device to be communicated with a processor on the circuit board to be detected;
s302, a control instruction for entering a fan driving circuit fault detection process is sent to a processor on a circuit board to be detected through a controller MCU on the detection device;
s303, after a processor on a circuit board to be tested enters a fault detection process of a fan driving circuit, controlling the fan driving circuit to output direct current power supply to power supply pins d1 and d3 in a fan detection interface J21 on a detection device so as to control the normally open contact attraction of a relay K1;
s304, a processor on the circuit board to be tested waits for receiving the PWM signal fed back by the detection device in a specified time period, and if the PWM signal is received, the fan driving circuit is judged to be normal; otherwise, judging that the fan driving circuit is faulty;
in this embodiment, if the fan driving circuit can correctly output dc power under the control of the processor and can feed back the PWM signal to the processor, the fan driving circuit is considered to be normal;
in this embodiment, a processor on a circuit board to be tested may directly generate a fault detection result according to the feedback condition of the PWM signal, and then send the fault detection result to a controller MCU on the detection device; the feedback signal can also be generated and sent to the controller MCU on the detection device after the processor on the circuit board to be detected receives the feedback PWM signal. The method comprises the steps that a controller MCU on a detection device waits for receiving a feedback signal output by a circuit board to be detected within a set time, and if the feedback signal is received, the fan driving circuit is judged to be normal; otherwise, judging the fan driving circuit to be faulty and generating a fault detection result;
s305, driving a display module P1 to output a detection result through a controller MCU on the detection device, and displaying a fault code to indicate a fault position when the existence of a fault is detected;
and S306, after the fault detection task is completed, the controller MCU on the detection device sends an instruction to the processor on the circuit board to be detected, and the processor on the circuit board to be detected is controlled to exit the fault detection process of the fan driving circuit.
Multiple sets of fan drive detection modules may be provided in the circuit board detection device of the present embodiment, and fig. 1 shows a case where three sets of fan drive detection modules are provided. The fan detection interface J22, the relay K2 and the diode D11 form a second group of fan drive detection modules; the fan detection interface J23, the relay K3 and the diode D12 form a third group of fan drive detection modules; the normally open contacts of the relays in the three groups of fan drive detection modules can be connected to the same path of PWM signal output pins PWM1 of the controller MCU through the same path of current limiting resistor R83, and the fault detection requirements of the three fan drive circuits can be met by utilizing one path of PWM signals output by the controller MCU.
Of course, any number of fan drive detection modules can be arranged in the circuit board detection device so as to meet different test requirements.
The circuit board detection device can complete the fault detection task of the stepping motor driving circuit and the fan driving circuit without externally connecting the stepping motor and the fan, has high detection speed and low false alarm rate, and greatly improves the production efficiency.
It should be understood that the above description is not intended to limit the invention to the particular embodiments disclosed, but to limit the invention to the particular embodiments disclosed, and that other variations, modifications, additions and substitutions are possible, without departing from the scope of the invention as disclosed in the accompanying claims.
Claims (10)
1. A circuit board detection device is characterized in that:
a step motor driving circuit which outputs N paths of pulse signals for driving the step motor to rotate forward or backward;
the fan driving circuit outputs direct current power supply and is used for driving the fan to operate;
the detection device is characterized in that:
the stepping motor detection interface comprises N pins for receiving the N paths of pulse signals;
the N paths of waveform shaping circuits are connected with the N pins of the stepping motor detection interface in a one-to-one correspondence manner, and respectively perform shaping treatment on the N paths of pulse signals;
the controller receives the N paths of pulse signals after the shaping processing, judges whether the stepping motor driving circuit is faulty according to the N paths of pulse signals after the shaping processing, and generates a fault detection result;
the fan detection interface comprises two power supply pins for receiving the direct current power supply output by the fan driving circuit and a feedback pin for feeding back PWM signals to the fan driving circuit;
and a coil of the relay is connected between the two power supply pins of the fan detection interface, and a normally open contact of the relay is connected between the feedback pin of the fan detection interface and one path of PWM signal output pin of the controller.
2. The circuit board detection device according to claim 1, wherein the N pulse signals are N pulse sequences, N is greater than or equal to 2, and the controller judges whether the stepper motor driving circuit fails according to the time sequence of the received N pulse sequences.
3. The circuit board inspection device according to claim 2, wherein,
the stepping motor driving circuit outputs N paths of pulse sequences for driving the stepping motor to rotate forward in a specified forward rotating time period and outputs N paths of pulse sequences for driving the stepping motor to rotate reversely in a specified reverse rotating time period;
the controller judges that the stepping motor driving circuit is normal if the controller detects that the time sequence of the N paths of pulse sequences received by the controller is a forward rotation time sequence in a specified forward rotation time period and the time sequence of the N paths of pulse sequences received by the controller is a reverse rotation time sequence in a specified reverse rotation time period; otherwise, judging that the stepping motor driving circuit is faulty.
4. The circuit board inspection device according to claim 3, wherein,
the circuit board is provided with a processor for controlling the operation of the stepping motor driving circuit, the controller is communicated with the processor, and the processor is controlled to enter a fault detection process of the stepping motor driving circuit;
and after entering a fault detection process of the stepping motor driving circuit, the processor controls the stepping motor driving circuit to output a pulse sequence with a specific time sequence in a specified time period.
5. The circuit board inspection device according to any one of claims 1 to 4, wherein the stepper motor inspection interface includes 4 pins for receiving the pulse signal, in order of a first pin, a second pin, a third pin, and a fourth pin; and a first inductor is connected between the first pin and the second pin in a bridging way, and a second inductor is connected between the third pin and the fourth pin in a bridging way.
6. The circuit board detection device according to any one of claims 1 to 4, wherein each of the waveform shaping circuits includes a voltage dividing circuit, a clamping circuit and a current limiting resistor, each of the pulse signals is reduced in voltage by the voltage dividing circuit and limited by the clamping circuit, and then transmitted to the controller through the current limiting resistor, and the controller correspondingly receives the N pulse signals processed by the waveform shaping circuits through N I/O ports thereof.
7. The circuit board detection device according to claim 6, wherein the voltage dividing circuit comprises two voltage dividing resistors connected in series and connected between the pins of the stepper motor detection interface and the ground; the clamping circuit comprises two diodes which are connected in series in the forward direction, the cathodes of the two diodes are connected with a direct current power supply after being connected in series, the anodes of the two diodes are grounded, the middle nodes of the two diodes are connected with the middle nodes of two voltage dividing resistors, and the two voltage dividing resistors are connected with the controller through the current limiting resistor.
8. The circuit board detection device according to any one of claims 1 to 4, wherein when a fan driving circuit on the circuit board is subjected to fault detection, the fan driving circuit is controlled by a processor on the circuit board to supply direct current to two power supply pins of the fan detection interface, and a PWM signal fed back by the feedback pin is waited to be received; and if the processor receives the fed-back PWM signal, judging that the fan driving circuit is normal, otherwise, judging that the fan driving circuit is faulty.
9. The circuit board inspection device of claim 8, wherein,
the processor on the circuit board generates a fault detection result and feeds the fault detection result back to the controller; or,
after receiving the PWM signal, a processor on the circuit board outputs a feedback signal to the controller; and if the controller receives the feedback signal within a set time, judging that the fan driving circuit is normal, otherwise, judging that the fan driving circuit is faulty, and generating a fault detection result.
10. The circuit board detection device according to any one of claims 1 to 4, wherein a display module is further provided in the detection device, and is connected to the controller, and the controller generates a fault code according to a fault detection result, and outputs display through the display module.
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| CN109658599A (en) * | 2018-12-07 | 2019-04-19 | 陕西瑞迅电子信息技术有限公司 | The unmanned convenient office system of one kind and its control method |
| CN110095710A (en) * | 2019-05-22 | 2019-08-06 | 格力电器（武汉）有限公司 | Fault detection device and method |
| CN111089411B (en) * | 2019-12-02 | 2021-06-15 | 珠海格力电器股份有限公司 | Operation control device, electrical equipment and operation control method thereof |
| CN111487479B (en) * | 2020-04-28 | 2022-06-03 | 中科龙人高新技术有限公司 | Industrial robot drive plate detects card |
| CN112737433B (en) * | 2020-12-31 | 2022-12-06 | 上海昱章电气股份有限公司 | Control method, device and system for brake-free stepping motor |
| CN114035535B (en) * | 2021-10-12 | 2024-07-19 | 苏州蓝博控制技术有限公司 | Mechanical accelerator motor controller detection method and automatic detection system of mechanical accelerator motor controller |
| CN118091209B (en) * | 2024-04-29 | 2024-11-29 | 常州同惠电子股份有限公司 | A high voltage test system and test method for rapid contact detection without power supply |
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