A detection device for an optical code receiving amplification circuit

Abstract

This utility model discloses a testing device for an optical code receiving amplification circuit. It includes the optical code receiving amplification circuit to be tested, as well as a pulse generation unit, an input code channel switching unit, an output signal acquisition unit, an output signal detection unit, an output signal display unit, and a power supply unit. The pulse generation unit simulates the optical code input signal from the photovoltaic cell, and the input code channel switching unit switches on the simulated input signal of any photovoltaic cell code channel. After reception, amplification, and processing by the optical code receiving amplification circuit, the device can automatically detect whether the output pulse signal of the optical code receiving amplification circuit meets the technical requirements. This testing device is applied to the debugging, testing, and troubleshooting of optical code receiving amplification circuits. It can quickly test the performance parameters of any code channel of the optical code receiving amplification circuit and accurately locate faults in any code channel of the circuit.

Description

Technical Field

[0001] This utility model belongs to the field of circuit testing, specifically relating to a testing device for an optical code receiving amplification circuit. Background Technology

[0002] The photoelectric coding system measures the position of the line of sight relative to the line of aiming. The optical code receiving and amplifying circuit converts the angle signal into a digital code. The digital code reflects the angular error between the measuring line and the line of aiming, determining the tracking speed and accuracy, and is a crucial indicator for the tank's fire control system in tracking targets.

[0003] Previously, troubleshooting the optical code amplification circuit involved using an oscilloscope to test the output signals of each horizontal and vertical code channel, which was time-consuming and laborious. Therefore, a tool is needed to quickly detect and locate faults in the optical code receiving amplification circuit. Utility Model Content

[0004] This utility model discloses a detection device for an optical code receiving and amplifying circuit, which can quickly detect any code channel of the optical code receiving and amplifying circuit.

[0005] The objective of this invention is achieved through the following technical means: a detection device for an optical code receiving amplification circuit, comprising the optical code receiving amplification circuit to be detected, and further comprising... The pulse generation unit is used to simulate the output of millivolt-level voltage pulse signals from a photovoltaic cell as it transitions from bright to dark or from dark to bright. The access code channel switching unit is electrically connected to the input terminal of the optical code receiving amplifier circuit and the pulse generating unit. It includes an input branch with the same code number as the optical code receiving amplifier circuit. Each input branch is connected to a pin of the input terminal of the optical code receiving amplifier circuit. Each input branch is also equipped with an input switch to receive the pulse signal sent by the pulse generating unit and send it to a specific pin of the input terminal of the optical code receiving amplifier circuit. The output signal acquisition unit is connected to the output terminal of the optical code receiving amplifier circuit. It includes an output branch with the same code number as the optical code receiving amplifier circuit. Each output branch is connected to a pin of the output terminal of the optical code receiving amplifier circuit. Each output branch is also equipped with an output switch. The output signal detection unit, connected to the output signal acquisition unit, is used to detect the output signal of the optical code receiving amplifier circuit; The power supply unit is electrically connected to the pulse generation unit and supplies power to the pulse generation unit and the detection device. The power supply unit includes a DC voltage regulator unit, a first voltage regulator module, and a second voltage regulator module. The input terminal of the DC voltage regulator unit is connected to an external power supply, the positive output terminal is connected to the first voltage regulator module, and the negative output terminal is connected to the second voltage regulator module. The positive output terminal of the first voltage regulator module is electrically connected to the pulse generator unit and the optical code receiving amplifier circuit, respectively. The negative output terminal of the second voltage regulator module is connected to the optical code receiving amplifier circuit.

[0006] The pulse generation unit is a multivibrator that outputs high and low pulse signals.

[0007] The pulse generation unit includes a timer, adjustable resistors R25 and R26, capacitors C1 and C2, adjustable resistors R23 and R24. The output of the power supply unit is connected to pins 4 and 8 of the timer. The output of the power supply unit is also connected to a fixed pin of the adjustable resistor R25. The other fixed pin of the adjustable resistor R25 is connected to resistor R26 and pin 7 of the timer. The movable pin of the adjustable resistor R25 is connected to pin 7 of the timer. The other end of resistor R26 is connected to pins 2 and 6 of the timer and one end of capacitor C1. The other end of capacitor C1 is grounded and connected to pin 1 of the timer. One end of capacitor C2 is connected to pin 5 of the timer, and the other end is grounded. Timer 3 pin is the output terminal and is electrically connected to the access code channel switching unit.

[0008] The timer 3 pin is also connected in sequence to an adjustable resistor R23 and a resistor R24. The timer 3 pin is connected to one fixed pin of the adjustable resistor R23, and the other fixed pin and the movable pin are both connected to the resistor R24. The other end of the resistor R24 ​​is grounded.

[0009] Each input branch of the access code channel switching unit is connected to an LED indicator.

[0010] The output switch includes one input terminal and two output terminals. Its input terminal is connected to the output terminal of the optical code receiving amplifier circuit, one output terminal is connected to the output signal detection unit, and the other output terminal is used to connect to external detection equipment.

[0011] The access code channel switching unit also includes a horizontal and vertical input switching switch. The horizontal and vertical input switching switch has two output terminals. The input branches are divided into horizontal input branches and vertical input branches. All horizontal input branches are connected to one output terminal of the horizontal and vertical input switching switch, and all vertical input branches are connected to the other output terminal of the horizontal and vertical input switching switch.

[0012] The output signal acquisition unit also includes a horizontal-vertical output switching switch. The horizontal-vertical output switching switch has two input terminals. The output branches are divided into horizontal output branches and vertical output branches. All horizontal output branches are connected to one input terminal of the horizontal-vertical output switching switch, and all vertical output branches are connected to the other input terminal of the horizontal-vertical output switching switch.

[0013] It also includes an output signal display unit, which is connected to the output signal detection unit and is used to display the output signal detection value.

[0014] The beneficial effects of this invention are as follows: By simulating the optical code input signal of the photovoltaic cell through the pulse generation unit, and connecting the code channel switching unit to turn on the analog input signal of any photovoltaic cell code channel (10 code channels in the horizontal and 10 code channels in the vertical direction, for a total of 20 code channels), the output pulse signal of the optical code receiving amplifier circuit can be automatically detected to determine whether it meets the technical requirements after receiving, amplifying, and processing. This detection device can be applied to the debugging, testing, and troubleshooting of the optical code receiving amplifier circuit, and can quickly detect the performance parameters of any code channel (horizontal and vertical) of the 20 code channels of the optical code receiving amplifier circuit, and can also accurately locate the fault of any code channel of the 20 code channels of the circuit. Attached Figure Description

[0015] Figure 1 This is a circuit diagram of the detection device for the optical code receiving amplifier circuit; Figure 2 This is the schematic diagram of the power supply unit circuit. Figure 3 This is the circuit schematic of the pulse generation unit; Figure 4 Schematic diagram of the access code channel switching unit circuit; Figure 5 This is a circuit schematic diagram of the output signal acquisition unit and the output signal display unit. The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Detailed Implementation

[0016] A detection device for an optical code receiving amplification circuit includes an optical code receiving amplification circuit to be detected, and further includes, like Figure 1 and Figure 3 As shown, the pulse generation unit is used to simulate the output of millivolt-level voltage pulse signals from the photovoltaic cell as it goes from bright to dark or from dark to bright. The pulse generation unit is a multivibrator that outputs high and low pulse signals.

[0017] The pulse generation unit includes a timer, adjustable resistors R25 and R26, capacitors C1 and C2, adjustable resistors R23 and R24. The output of the power supply unit is connected to timer pins 4 and 8. The output of the power supply unit is also connected to a fixed pin of the adjustable resistor R25. The other fixed pin of the adjustable resistor R25 is connected to resistor R26 and timer pin 7. The movable pin of the adjustable resistor R25 is connected to timer pin 7. The other end of resistor R26 is connected to timer pins 2 and 6 and one end of capacitor C1. The other end of capacitor C1 is grounded and connected to timer pin 1. One end of capacitor C2 is connected to timer pin 5, and the other end is grounded. Timer 3 pin is the output terminal and is electrically connected to the access code channel switching unit.

[0018] The timer 3 pin is also connected to an adjustable resistor R23 and a resistor R24 ​​in sequence. The timer 3 pin is connected to a fixed pin of the adjustable resistor R23, and the other fixed pin and the movable pin of the resistor R23 are both connected to the resistor R24. The other end of the resistor R24 ​​is grounded.

[0019] like Figure 1 and Figure 3 As shown, the timer is a 555 timer, which forms the main body of a multivibrator. The output pulse signal is sent to the optical code receiving and amplifying circuit as the output signal of the simulated photovoltaic cell.

[0020] Its working principle is as follows: after the power is turned on, VCC charges capacitor C1 through resistors R25 and R26, which increases the voltage of VC (i.e., capacitor C1). The voltage at pins 2 and 6 of the 555 timer increases, and the output of comparator 1 in the 555 timer, i.e., the R terminal of the basic SR flip-flop, jumps to a low level. The output of comparator 2, i.e., the S terminal of the basic SR flip-flop, jumps to a high level, making the basic SR flip-flop active (0). The output pin 3, i.e., Vo=0, turns on the discharge tube T.

[0021] Capacitor C1 discharges through resistor R26 and pin 7, causing VC to drop. When VC drops to 1 / 3VCC, the output of comparator 1, i.e., the R terminal of the basic SR flip-flop, jumps to a high level, and the output of comparator 2, i.e., the S terminal of the basic SR flip-flop, jumps to a low level, making the basic SR flip-flop valid. The output pin 3, i.e., Vo, changes from 0 to 1, and the discharge transistor T is cut off.

[0022] VCC then charges capacitor C1 through resistors R25 and R26, repeating the above process to generate a continuous pulse signal.

[0023] The amplitude and frequency of the pulse voltage of the pulse generation unit can be adjusted by the relevant potentiometer to simulate the output voltage amplitude of a certain code channel of the photovoltaic cell from dark to light or from light to dark.

[0024] like Figure 1 and Figure 4 As shown, the access code channel switching unit is electrically connected to the input terminal of the optical code receiving amplifier circuit and the pulse generation unit. It includes input branches with the same code number as the optical code receiving amplifier circuit. Each input branch is connected to a pin of the input terminal of the optical code receiving amplifier circuit. Each input branch also has an input switch. Figure 4 k1.1, k2.1, etc., are used to receive pulse signals sent by the pulse generation unit and transmit them to specific pins at the input of the optical code receiving amplifier circuit.

[0025] Taking a common optical code receiver amplifier circuit as an example, it has a total of 20 code channels, including 10 horizontal code channels and 10 vertical code channels.

[0026] The access code channel switching unit also includes 20 input branches, each of which is connected to one code channel. By switching the input switches of the input branches, the pulse signal is sent to a specific pin at the input end of the optical code receiving amplifier circuit.

[0027] For example, when detecting the horizontal 1-bit code channel, the input switch of the input branch corresponding to the horizontal 1-bit code channel is closed, and all other input switches are open. The input branch of the horizontal 1-bit code channel is turned on, and the pulse signal generated by the 555 timer is input to the horizontal 1-bit code channel of the optical code receiving amplifier circuit.

[0028] The access code channel switching unit also includes a horizontal and vertical input switching switch. The horizontal and vertical input switching switch has two output terminals. The input branches are divided into horizontal input branches and vertical input branches. All horizontal input branches are connected to one output terminal of the horizontal and vertical input switching switch, and all vertical input branches are connected to the other output terminal of the horizontal and vertical input switching switch.

[0029] Since there are 20 code channels, including 10 horizontal code channels and 10 vertical code channels, the input branches are also divided into horizontal input branches and vertical input branches. The horizontal input branches are connected to the horizontal 10 code channels, and the vertical input branches are connected to the vertical 10 code channels.

[0030] The input terminals of all horizontal input branches are connected to one output terminal of the horizontal-vertical input switching switch, and the input terminals of all vertical input branches are connected to the other output terminal of the horizontal-vertical input switching switch.

[0031] Before testing, the horizontal or vertical input branch is selected by switching the horizontal and vertical inputs, and then the corresponding input switch is closed.

[0032] By using a double switch, operational errors are avoided. For example, to detect the horizontal 1-bit code track, the horizontal and vertical input switching switch must first be switched to the horizontal input branch, and then the horizontal input branch corresponding to the horizontal 1-bit code track must be closed to form a complete loop. If either switch is closed incorrectly, a loop will not be formed.

[0033] like Figure 1 and Figure 5 As shown, the output signal acquisition unit is connected to the output terminal of the optical code receiving and amplifying circuit. It includes output branches with the same code number as the optical code receiving and amplifying circuit. Each output branch is connected to a pin of the output terminal of the optical code receiving and amplifying circuit. Each output branch also has an output switch. Figure 5 k1.2, k2.2, etc. in the example; The output signal acquisition unit is similar to the access code channel switching unit. The 20 output code points of the optical code receiving amplifier circuit correspond to 20 output branches, and each output branch has an output switch.

[0034] For example, when detecting a horizontal 1-bit code channel, the input switches of the input branch corresponding to the horizontal 1-bit code channel and the output switches of the corresponding output branch are all closed to form a complete loop. The pulse signal sent by the pulse generation unit is input to the horizontal 1-bit code channel input terminal of the optical code receiving amplifier circuit through the code channel switching unit. After processing, it is sent from the horizontal 1-bit code channel output terminal of the circuit to the output signal acquisition unit for detection.

[0035] The output signal acquisition unit also includes a horizontal-vertical output switching switch. The horizontal-vertical output switching switch has two input terminals. The output branches are divided into horizontal output branches and vertical output branches. All horizontal output branches are connected to one input terminal of the horizontal-vertical output switching switch, and all vertical output branches are connected to the other input terminal of the horizontal-vertical output switching switch.

[0036] The horizontal-vertical output switching switch works similarly to the horizontal-vertical input switching switch. The output terminals of all horizontal output branches are connected to one input terminal of the horizontal-vertical input switching switch, and the output terminals of all vertical output branches are connected to the other input terminal of the horizontal-vertical output switching switch. During testing, all four switches (horizontal-vertical output switching switch, horizontal-vertical input switching switch, input switch, and output switch) must be correctly closed to measure specific values. This avoids testing errors caused by operational mistakes. For example, if you want to measure the horizontal 1-bit code channel, but close the vertical 1-bit code channel input switch, without the horizontal-vertical input switching switch, you might incorrectly measure the data of the vertical 1-bit code channel and record it incorrectly on the horizontal 1-bit code channel.

[0037] However, with the horizontal / vertical input switch, if the switch is correctly switched to the horizontal position, the entire circuit will not conduct, and there will be no measurement results. When the tester sees no results, they can quickly determine that there is a switch closure error. By setting multiple switches, any switch closure error will prevent the test from obtaining results, thus reducing the probability of test errors.

[0038] Output signal detection unit, i.e. Figure 5 The voltmeter in the middle is connected to the output signal acquisition unit and is used to detect the output signal of the optical code receiving amplifier circuit; The presence or absence of a fault in the optical code receiving amplifier circuit can be determined by detecting the level of the output signal. For example, if the output signal should be low but the result is high, it indicates a fault in that code channel.

[0039] It also includes an output signal display unit, which is connected to the output signal detection unit and is used to display the output signal detection value.

[0040] The output signal display unit is a display screen used to display the voltage value detected by the output signal detection unit.

[0041] The power supply unit is electrically connected to the pulse generation unit and supplies power to the pulse generation unit and the detection device. like Figure 1 and Figure 2 As shown, the power supply unit includes a DC voltage regulator unit, a first voltage regulator module, and a second voltage regulator module. The input terminal of the DC voltage regulator unit is connected to an external power supply, the positive output terminal is connected to the first voltage regulator module, and the negative output terminal is connected to the second voltage regulator module. The positive output terminal of the first voltage regulator module is electrically connected to the pulse generator unit and the optical code receiving amplifier circuit, respectively. The negative output terminal of the second voltage regulator module is connected to the optical code receiving amplifier circuit.

[0042] The input 220V AC power is converted to +15V and -15V DC power through a regulated DC power supply; the input +15V DC power is converted to +5V DC power through the first voltage regulator module 7805; and the input -15V DC power is converted to -12V DC power through the second voltage regulator module 7912.

[0043] The first voltage regulator module is a 7805, which provides +5V voltage to the detection device and the optical code receiving amplifier circuit.

[0044] The second voltage regulator module is a 7912, which provides the required -12V voltage to the optical code receiving amplifier circuit.

[0045] Each input branch of the access code channel switching unit is connected to an LED indicator.

[0046] By using light-emitting diodes (LEDs) as indicator lights for the analog signals from the photovoltaic cells, it is easy for testing personnel to observe which code bit of the input switch has been closed.

[0047] The output switch includes one input terminal and two output terminals. Its input terminal is connected to the output terminal of the optical code receiving amplifier circuit, one output terminal is connected to the output signal detection unit, and the other output terminal is used to connect to external detection equipment.

[0048] One output terminal of the output switch is connected to the output signal detection unit inside the detection device, and is tested using the built-in voltmeter. The other output terminal is a reserved test hole for connecting external detection equipment, such as a voltmeter or oscilloscope, to test the output of the optical code receiving amplifier circuit.

Claims

1. A detection device for an optical code receiving amplification circuit, comprising the optical code receiving amplification circuit to be detected, characterized in that, Also includes: The pulse generation unit is used to simulate the output of millivolt-level voltage pulse signals from a photovoltaic cell as it transitions from bright to dark or from dark to bright. The access code channel switching unit is electrically connected to the input terminal of the optical code receiving amplifier circuit and the pulse generating unit. It includes an input branch with the same code number as the optical code receiving amplifier circuit. Each input branch is connected to a pin of the input terminal of the optical code receiving amplifier circuit. Each input branch is also equipped with an input switch to receive the pulse signal sent by the pulse generating unit and send it to a specific pin of the input terminal of the optical code receiving amplifier circuit. The output signal acquisition unit is connected to the output terminal of the optical code receiving amplifier circuit. It includes an output branch with the same code number as the optical code receiving amplifier circuit. Each output branch is connected to a pin of the output terminal of the optical code receiving amplifier circuit. Each output branch is also equipped with an output switch. The output signal detection unit, connected to the output signal acquisition unit, is used to detect the output signal of the optical code receiving amplifier circuit; The power supply unit is electrically connected to the pulse generation unit and supplies power to the pulse generation unit and the detection device.

2. The detection device for an optical code receiving amplification circuit according to claim 1, characterized in that: The power supply unit includes a DC voltage regulator unit, a first voltage regulator module, and a second voltage regulator module. The input terminal of the DC voltage regulator unit is connected to an external power supply, the positive output terminal is connected to the first voltage regulator module, and the negative output terminal is connected to the second voltage regulator module. The positive output terminal of the first voltage regulator module is electrically connected to the pulse generator unit and the optical code receiving amplifier circuit, respectively. The negative output terminal of the second voltage regulator module is connected to the optical code receiving amplifier circuit.

3. The detection device for an optical code receiving amplification circuit according to claim 1, characterized in that: The pulse generation unit is a multivibrator that outputs high and low pulse signals.

4. The detection device for an optical code receiving amplification circuit according to claim 1 or 3, characterized in that: The pulse generation unit includes a timer, adjustable resistors R25 and R26, capacitors C1 and C2, adjustable resistors R23 and R24. The output of the power supply unit is connected to pins 4 and 8 of the timer. The output of the power supply unit is also connected to a fixed pin of the adjustable resistor R25. The other fixed pin of the adjustable resistor R25 is connected to resistor R26 and pin 7 of the timer. The movable pin of the adjustable resistor R25 is connected to pin 7 of the timer. The other end of resistor R26 is connected to pins 2 and 6 of the timer and one end of capacitor C1. The other end of capacitor C1 is grounded and connected to pin 1 of the timer. One end of capacitor C2 is connected to pin 5 of the timer, and the other end is grounded. Timer 3 pin is the output terminal, which is electrically connected to the access code channel switching unit.

5. The detection device for an optical code receiving amplification circuit according to claim 4, characterized in that: The timer 3 pin is also connected in sequence to an adjustable resistor R23 and a resistor R24. The timer 3 pin is connected to one fixed pin of the adjustable resistor R23, and the other fixed pin and the movable pin are both connected to the resistor R24. The other end of the resistor R24 ​​is grounded.

6. The detection device for an optical code receiving amplification circuit according to claim 1, characterized in that: Each input branch of the access code channel switching unit is connected to an LED indicator.

7. The detection device for an optical code receiving amplification circuit according to claim 1, characterized in that: The output switch includes one input terminal and two output terminals. Its input terminal is connected to the output terminal of the optical code receiving amplifier circuit, one output terminal is connected to the output signal detection unit, and the other output terminal is used to connect to external detection equipment.

8. The detection device for an optical code receiving amplification circuit according to claim 1, characterized in that: The access code channel switching unit also includes a horizontal and vertical input switching switch. The horizontal and vertical input switching switch has two output terminals. The input branches are divided into horizontal input branches and vertical input branches. All horizontal input branches are connected to one output terminal of the horizontal and vertical input switching switch, and all vertical input branches are connected to the other output terminal of the horizontal and vertical input switching switch.

9. The detection device for an optical code receiving amplification circuit according to claim 1, characterized in that: The output signal acquisition unit also includes a horizontal-vertical output switching switch. The horizontal-vertical output switching switch has two input terminals. The output branches are divided into horizontal output branches and vertical output branches. All horizontal output branches are connected to one input terminal of the horizontal-vertical output switching switch, and all vertical output branches are connected to the other input terminal of the horizontal-vertical output switching switch.

10. The detection device for an optical code receiving amplification circuit according to claim 1, characterized in that: It also includes an output signal display unit, which is connected to the output signal detection unit and is used to display the output signal detection value.

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