CN114302534B - LED operation shadowless lamp fault detection method and system - Google Patents
LED operation shadowless lamp fault detection method and system Download PDFInfo
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Abstract
The invention relates to the field of LED operation shadowless lamps, in particular to a system and a method for detecting faults of an LED operation shadowless lamp, comprising the following steps: the circuit board, the main control chip, a plurality of driving chips, a plurality of driving circuits, a main board, a key control board, a plurality of sampling resistors and a plurality of amplifying circuits; the multiple amplifying circuits are integrated on the same driving board, so that the problem that a single fault detection board needs to be connected with multiple communication cables is avoided, faults are identified in a mode of sampling current at the tail end of the constant current driving chip, the voltage of a sampling end is low, the high-voltage resistance requirement on the operational amplifier chip is low, the system cost is low, meanwhile, a sampling resistor is arranged between the tail end of the constant current driving chip and the integral GND plane of the circuit board, namely, a single point is grounded, a certain isolation is realized, and the anti-interference effect can be improved; the invention also utilizes the average value of the plurality of binary voltage difference value data to be compared with the PWM driving signal, and compared with the corresponding voltage difference value, the fault monitoring accuracy is higher.
Description
Technical Field
The invention relates to the field of LED operation shadowless lamps, in particular to a system and a method for detecting faults of an LED operation shadowless lamp.
Background
In the use process of the operation lamp, the fault condition of the operation lamp panel possibly exists, because each lamp bead on the operation lamp panel is connected in series and driven by the PWM constant current driving chip. Therefore, if one lamp bead on one lamp panel is damaged in the use process of the operation lamp, other lamp beads connected with the lamp bead in series are not lighted.
The fault detection adopted by common operating lamp products is to provide a detection board for each lamp group and connect the detection board to a main board through a cable. The voltage drop can be generated when each lamp bead is conducted, if one lamp bead is damaged, the voltage difference at two ends of the lamp group connected with the lamp bead in series is a power supply voltage value, and if the lamp group works normally, the voltage difference at two ends of the lamp group is the sum of the conducted voltage drops of each lamp bead; and judging whether the lamp group fails or not by comparing the pressure difference of the two ends of the lamp group.
However, the fault detection scheme employing the detection plate has the following drawbacks:
1. a plurality of lamp panels are arranged on one operating lamp, a plurality of lamp groups are arranged on each lamp panel, and the detection plate is connected with the main control board in a cable connection mode, so that a plurality of cables are required to be connected to the main control board, and the requirement on the number of IO ports of the main control chip on the main control board is relatively increased;
2. the mode of adopting the cable to connect can occupy the space in the interior of a plurality of hand lamps, leads to mixing with other cables, and is unfavorable for maintenance.
3. The cable interface is also loose, so that the lamp set cannot be detected.
Disclosure of Invention
The invention aims to overcome the defects that the fault detection scheme of a detection board is adopted to have large demand on the number of IO ports of a main control chip on the main control board, a cable occupies the space inside a hand lamp, is mixed with other cables, is not beneficial to maintenance and has the problem of looseness at the cable interface, thereby providing the LED operation shadowless lamp fault detection system and method. Therefore, in order to solve the problems, the LED operation shadowless lamp fault detection system and the LED operation shadowless lamp fault detection method integrate a plurality of groups of LED lamp fault detection circuits and a plurality of driving circuits into one driving plate; the LED operation shadowless lamp fault detection system provided by the technical scheme of the invention comprises: the device comprises a circuit board, a main control chip, a plurality of driving chips, a plurality of driving circuits, a main board and a key control board; characterized in that the system further comprises: a plurality of sampling resistors and a plurality of amplifying circuits; wherein,
the driving circuits and the amplifying circuits are printed on the same circuit board;
the driving chips, the driving circuits, the sampling resistors and the amplifying circuits are in one-to-one correspondence to form a plurality of groups of fault detection modules; the main control chip is connected with the driving chips and is used for sending PWM driving signals to each driving chip;
each driving chip is used for controlling the corresponding driving circuit and driving an LED lamp group of the LED surgical shadowless lamp connected with the driving circuit based on the corresponding PWM driving signal;
each sampling resistor is connected with the tail end of the corresponding driving chip and the GND plane of the circuit board respectively and is used for providing a plurality of voltage difference values;
each amplifying circuit is used for collecting and amplifying the voltage difference value provided by the corresponding sampling resistor;
the main control chip is also connected with a plurality of amplifying circuits and is used for receiving the voltage difference value amplified by each amplifying circuit and converting the voltage difference value into binary voltage difference value data; after a certain amount of binary voltage difference data corresponding to a certain amplifying circuit is obtained, calculating an average value of the binary voltage difference data, comparing the average value with a corresponding PWM driving signal output by the main control chip, generating a correct signal and sending the correct signal to the main board if the average value is matched with the corresponding PWM driving signal, and generating an error signal and sending the error signal to the main board if the average value is not matched with the corresponding driving signal.
As an improvement of the above device, the main board is configured to parse the "correct signal" and the "error signal" and send the parsed "error signal" to the key control board; and after the key control board receives the analyzed error signal, starting a fault display lamp arranged on the key control board to alarm.
As an improvement of the device, the main control chip is provided with an AD collector, wherein a collection pin of the AD collector is connected with the output end of the amplifying circuit.
As an improvement of the above device, the sampling resistor is connected to the GND pin at the end of the driving chip.
As an improvement of the device, the driving chip adopts an LED constant current driving chip.
As an improvement of the above apparatus, the fault detection system further comprises: a power supply; the power supply is connected with the driving chip and used for providing 24V voltage.
As an improvement of the above apparatus, the amplifying circuit includes: and a differential amplifying circuit.
As an improvement of the above device, the key control board is used for displaying the error signal.
In order to achieve still another object of the present invention, the present invention provides a fault detection method for an LED surgical shadowless lamp, based on the above fault detection system, the detection method includes:
step 1), a PWM driving signal is sent to each driving chip through the main control chip;
step 2) controlling the corresponding driving circuit through the driving chip, and driving the LED lamp group of the LED operation shadowless lamp connected with the driving circuit based on the corresponding PWM driving signal;
step 3) providing a plurality of voltage difference values through a plurality of sampling resistors connected with the tail end of the driving chip and the GND plane of the circuit board;
step 4) collecting and amplifying the voltage difference value provided by the corresponding sampling resistor through the amplifying circuit;
step 5) receiving the voltage difference value amplified by the amplifying circuit through the main control chip and converting the voltage difference value into binary voltage difference value data; after a certain quantity of binary voltage difference value data corresponding to a certain amplifying circuit is obtained, calculating an average value of the binary voltage difference value data; comparing the average value with a corresponding PWM driving signal output by the main control chip, if the average value is matched with the corresponding PWM driving signal output by the main control chip, generating a correct signal by the main control chip and sending the correct signal to the main board, and if the average value is not matched with the corresponding driving signal, generating an error signal by the main control chip and sending the error signal to the main board;
step 6), analyzing the correct signal and the error signal through the main board, and sending the analyzed error signal to the key control board;
and 7) after the key control board receives the analyzed error signal, starting a fault display lamp arranged on the key control board.
As an improvement of the above method, the fault detection method collects the amplified voltage value through an AD collector of the main control chip; and the acquisition pin of the AD acquisition device is connected with the output end of the amplifying circuit.
The LED operation shadowless lamp fault detection system and method provided by the invention have the advantages that: the system adopts a mode that the driving board is connected with the lamp panel, integrates a plurality of fault detection circuits, namely the amplifying circuit and the plurality of driving circuits, on the same driving board, avoids the problem that a single fault detection board needs to be connected with a plurality of communication cables, adopts a mode of sampling the current at the tail end of the constant current driving chip to identify faults, has lower voltage of a sampling end, has lower high voltage resistance requirement on the operational amplifier chip, has low system cost, and has a sampling resistor between the tail end of the constant current driving chip and the integral GND plane of the circuit board, namely single-point grounding, has certain isolation and can increase the anti-interference effect; the invention also utilizes the average value of the plurality of binary voltage difference value data to be compared with the PWM driving signal, and compared with the corresponding voltage difference value, the fault monitoring accuracy is higher.
Drawings
Fig. 1 is a flowchart of a fault detection method of an LED surgical shadowless lamp provided by the invention.
Detailed Description
The technical scheme provided by the invention is further described below by combining with the embodiment.
The fault detection and collection principle of the LED operation shadowless lamp fault detection system and method provided by the invention is as follows: and after the power supply module supplies power of 24V, when a group of LED lamp beads driven by the LED constant current driving chip are not damaged, the LED lamp is lighted, and current flows through the constant current driving chip. In general, the power supply voltage required by the single power supply operational amplifier is generally smaller than 24V, so that the scheme of adding a sampling circuit at the front end of the LED constant current driving chip is omitted, and the scheme of sampling at the tail end is adopted instead. And the tail end sampling is to add a sampling resistor between the GND pin of the driving chip and the ground plane of the circuit board, feed back the differential ratio operation to the operational amplifier chip through the differential pressure difference between the two ends of the sampling resistor, output the amplified differential value, and then enable the main control chip on the driving board to sample the output. If the main control chip applies PWM driving signals to the LED constant current driving chip, but the voltage amplified by the amplifying sampling circuit at the tail end of the driving chip is not matched with the PWM driving signal, the damage of the lamp beads in the group of LED lamp beads driven by the constant current driving chip can be judged.
The LED lamp fault detection method is realized through a fault detection system, and the working state of the constant current driving chip for driving each group of lamp beads is detected through the LED lamp fault detection circuit. The invention realizes that the output end of the acquisition function amplifier is connected to the AD acquisition pin of the chip through the AD acquisition of the main control chip on the drive board, the voltage value acquired by the chip through the pin is converted into a group of binary data, then the main program obtains the binary data for a certain number of times and then carries out average value calculation on the groups of binary data, the average value is obtained and then is filled into the self-working state information of the transmission protocols of the drive board and the main board, then the polling signal of the main board is waited for coming, and if the polling signal of the main board is received, the self-working state information of the drive board is transmitted to the main board. The main board receives and analyzes the information, and after finding that the driving board contains fault information, sends an error signal to the control panel of the operating lamp, and the red warning lamp on the control panel is on to give a warning effect to a user.
The invention realizes the fault detection of the lamp panel of the operating lamp, can detect fault information through the driving plate for driving the LED lamp beads, feeds information back to the main board through communication with the main board, then analyzes and sends the obtained information to the control panel through communication between the main board and the control panel, and the fault indication lamp on the control panel is lightened, thereby providing visual feeling for users.
Example 1
The invention provides a fault detection system of an LED operation shadowless lamp, which comprises: the device comprises a circuit board, a main control chip, a plurality of driving chips, a plurality of driving circuits, a main board and a key control board; characterized in that the system further comprises: a plurality of sampling resistors and a plurality of amplifying circuits; wherein,
the driving circuits and the amplifying circuits are printed on the same circuit board;
the driving chips, the driving circuits, the sampling resistors and the amplifying circuits are in one-to-one correspondence to form a plurality of groups of fault detection modules; the main control chip is connected with the driving chips and is used for sending PWM driving signals to each driving chip;
each driving chip is used for controlling the corresponding driving circuit and driving an LED lamp group of the LED surgical shadowless lamp connected with the driving circuit based on the corresponding PWM driving signal;
each sampling resistor is connected with the tail end of the corresponding driving chip and the GND plane of the circuit board respectively and is used for providing a plurality of voltage difference values;
each amplifying circuit is used for collecting and amplifying the voltage difference value provided by the corresponding sampling resistor;
the main control chip is also connected with a plurality of amplifying circuits and is used for receiving the voltage difference value amplified by each amplifying circuit and converting the voltage difference value into binary voltage difference value data; after a certain amount of binary voltage difference data corresponding to a certain amplifying circuit is obtained, calculating an average value of the binary voltage difference data, comparing the average value with a corresponding PWM driving signal output by the main control chip, generating a correct signal and sending the correct signal to the main board if the average value is matched with the corresponding PWM driving signal, and generating an error signal and sending the error signal to the main board if the average value is not matched with the corresponding driving signal.
The main board is used for analyzing the correct signal and the error signal and sending the analyzed error signal to the key control board; and after the key control board receives the analyzed error signal, starting a fault display lamp arranged on the key control board to alarm.
The main control chip is provided with an AD collector, wherein a collection pin of the AD collector is connected with the output end of the amplifying circuit.
And the sampling resistor is connected with a GND pin at the tail end of the driving chip.
The driving chip adopts an LED constant current driving chip.
The fault detection system further includes: a power supply; the power supply is connected with the driving chip and used for providing 24V voltage.
The amplifying circuit includes: and a differential amplifying circuit.
The key control board is used for displaying the error signal.
Example 2
As shown in fig. 1, the invention provides a fault detection method for an LED operation shadowless lamp, which is implemented based on the fault detection system, and comprises the following steps:
step 1), a PWM driving signal is sent to each driving chip through the main control chip;
step 2) controlling the corresponding driving circuit through the driving chip, and driving the LED lamp group of the LED operation shadowless lamp connected with the driving circuit based on the corresponding PWM driving signal;
step 3) providing a plurality of voltage difference values through a plurality of sampling resistors connected with the tail end of the driving chip and the GND plane of the circuit board; the difference value of the voltages at two ends of the sampling resistor is determined according to the working current of the driving chip;
step 4) collecting and amplifying the voltage difference value provided by the corresponding sampling resistor through the amplifying circuit;
step 5) receiving the voltage difference value amplified by the amplifying circuit through the main control chip and converting the voltage difference value into binary voltage difference value data; after a certain quantity of binary voltage difference value data corresponding to a certain amplifying circuit is obtained, calculating an average value of the binary voltage difference value data; comparing the average value with a corresponding PWM driving signal output by the main control chip, if the average value is matched with the corresponding PWM driving signal output by the main control chip, generating a correct signal by the main control chip and sending the correct signal to the main board, and if the average value is not matched with the corresponding driving signal, generating an error signal by the main control chip and sending the error signal to the main board; the "match" and "mismatch" are determined by the determination in the program, specifically, the average value, the offset voltage of the op-amp and the PWM driving signal output by the main control chip are compared to determine whether they match.
Step 6), analyzing the correct signal and the error signal through the main board, and sending the analyzed error signal to the key control board; the "correct signal" and "error signal" are determined by the internal definitions of the program, which are stored in the driver board program in parameters defined as "state values".
And 7) after the key control board receives the analyzed error signal, starting a fault display lamp arranged on the key control board.
The fault detection method is characterized in that the amplified voltage value is acquired through an AD (analog-to-digital) collector of the main control chip; and the acquisition pin of the AD acquisition device is connected with the output end of the amplifying circuit.
From the above detailed description of the invention, the mode that the driving board is connected with the lamp panel is adopted in the patent, so that a plurality of fault detection circuits, namely a plurality of amplifying circuits are integrated and a plurality of driving circuits are arranged on the same driving board, the problem that a single fault detection board needs to be connected with a plurality of communication cables is avoided, the fault is identified by adopting the mode of sampling the current at the tail end of the constant current driving chip, the voltage of the sampling end is lower, the high voltage resistance requirement on the operational amplifier chip is lower, the system cost is low, and meanwhile, a sampling resistor is arranged between the tail end of the constant current driving chip and the integral GND plane of the circuit board, namely, the single-point grounding is realized, a certain isolation is realized, and the anti-interference effect can be increased.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and are not limiting. Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the appended claims.
Claims (10)
1. An LED surgical shadowless lamp fault detection system, comprising: the device comprises a circuit board, a main control chip, a plurality of driving chips, a plurality of driving circuits, a main board and a key control board; characterized in that the system further comprises: a plurality of sampling resistors and a plurality of amplifying circuits; wherein,
the driving circuits and the amplifying circuits are printed on the same circuit board;
the driving chips, the driving circuits, the sampling resistors and the amplifying circuits are in one-to-one correspondence to form a plurality of groups of fault detection modules; wherein,
the main control chip is connected with a plurality of driving chips and is used for sending PWM driving signals to each driving chip;
each driving chip is used for controlling the corresponding driving circuit and driving an LED lamp group of the LED surgical shadowless lamp connected with the driving circuit based on the corresponding PWM driving signal;
each sampling resistor is connected with the tail end of the corresponding driving chip and the GND plane of the circuit board respectively and is used for providing a plurality of voltage difference values;
each amplifying circuit is used for collecting and amplifying the voltage difference value provided by the corresponding sampling resistor;
the main control chip is also connected with a plurality of amplifying circuits and is used for receiving the voltage difference value amplified by each amplifying circuit and converting the voltage difference value into binary voltage difference value data; after a certain amount of binary voltage difference data corresponding to a certain amplifying circuit is obtained, calculating an average value of the binary voltage difference data, comparing the average value with a corresponding PWM driving signal output by the main control chip, generating a correct signal and sending the correct signal to the main board if the average value is matched with the corresponding PWM driving signal, and generating an error signal and sending the error signal to the main board if the average value is not matched with the corresponding driving signal.
2. The LED surgical shadowless lamp fault detection system of claim 1, wherein said motherboard is configured to parse said "correct signal" and said "error signal" and send the parsed "error signal" to said key control board; and after the key control board receives the analyzed error signal, starting a fault display lamp arranged on the key control board to alarm.
3. The LED surgical shadowless lamp fault detection system of claim 1, wherein said main control chip is provided with an AD collector, wherein a collection pin of said AD collector is connected to an output of said amplifying circuit.
4. The LED surgical shadowless lamp fault detection system of claim 1, wherein said sampling resistor is connected to the GND pin at the end of said driver chip.
5. The LED surgical shadowless lamp fault detection system of claim 1, wherein said driver chip is an LED constant current driver chip.
6. The LED surgical shadowless lamp fault detection system of claim 1, wherein said fault detection system further comprises: a power supply; the power supply is connected with the driving chip and used for providing 24V voltage.
7. The LED surgical shadowless lamp fault detection system of claim 1, wherein said amplification circuit comprises: and a differential amplifying circuit.
8. The LED surgical shadowless lamp fault detection system of claim 1, wherein said key control board is configured to display said error signal.
9. A method for detecting faults of an LED surgical shadowless lamp, which is implemented based on the fault detection system according to any one of claims 1 to 8, the detection method comprising:
step 1), a PWM driving signal is sent to each driving chip through the main control chip;
step 2) controlling the corresponding driving circuit through the driving chip, and driving the LED lamp group of the LED operation shadowless lamp connected with the driving circuit based on the corresponding PWM driving signal;
step 3) providing a plurality of voltage difference values through a plurality of sampling resistors connected with the tail end of the driving chip and the GND plane of the circuit board;
step 4) collecting and amplifying the voltage difference value provided by the corresponding sampling resistor through the amplifying circuit;
step 5) receiving the voltage difference value amplified by the amplifying circuit through the main control chip and converting the voltage difference value into binary voltage difference value data; after a certain quantity of binary voltage difference value data corresponding to a certain amplifying circuit is obtained, calculating an average value of the binary voltage difference value data; comparing the average value with a corresponding PWM driving signal output by the main control chip, if the average value is matched with the corresponding PWM driving signal output by the main control chip, generating a correct signal by the main control chip and sending the correct signal to the main board, and if the average value is not matched with the corresponding driving signal, generating an error signal by the main control chip and sending the error signal to the main board;
step 6), analyzing the correct signal and the error signal through the main board, and sending the analyzed error signal to the key control board;
and 7) after the key control board receives the analyzed error signal, starting a fault display lamp arranged on the key control board.
10. The LED surgical shadowless lamp fault detection method of claim 9, wherein said fault detection method collects said amplified voltage values by an AD collector of said master control chip; and the acquisition pin of the AD acquisition device is connected with the output end of the amplifying circuit.
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