Test circuit for PCBA function output of remote controller

Abstract

The utility model discloses a test circuit for PCBA function output of a remote controller. The test circuit comprises a main chip, a power supply module, a high-frequency test circuit, a relay switch function test circuit, an analog output test, a serial port transmit-receive circuit and an analog input test circuit. The main chip is used for processing data; the power supply module is connected with the main chip and is used for supplying power to the main chip and an external tested board; the high-frequency test circuit is connected with the main chip and an external tested board and is used for high-frequency test; the relay switch function test circuit is connected with the main chip and an external tested board, and is used for testing a relay switch function; the analog quantity output test is connected with the main chip and an external tested board and is used for analog quantity output test; the analog input test circuit is connected with the main chip and an external tested board and is used for analog input test. According to the utility model, comprehensive verification of all function outputs of the PCBA is realized, defective products are screened, and the use risk and after-sales cost of final products are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of remote control PCBA function testing, in particular to a test circuit for remote control PCBA function output. Background Art

[0002] Currently, the remote control market is dominated by customized products. The production process involves a wide variety of PCBA materials, and ensuring their functionality is paramount. Comprehensive functional testing and quality control of PCBAs (Printed Circuit Board Assemblies) are crucial. To efficiently and accurately identify and resolve potential PCBA production issues, developing a dedicated test circuit system is crucial. Summary of the Invention

[0003] According to an embodiment of the present invention, a test circuit for the function output of a remote control PCBA is provided, which includes: a main chip, a power module, a high-frequency test circuit, a relay switch function test circuit, an analog output test, a serial port transceiver circuit, and an analog input test circuit;

[0004] The main chip is used for data processing;

[0005] The power module is connected to the main chip and is used to supply power to the main chip and the external board under test;

[0006] The high-frequency test circuit is connected to the main chip and the external tested board for high-frequency testing;

[0007] The relay switch function test circuit is connected to the main chip and the external test board for relay switch function testing;

[0008] The analog output test is connected to the main chip and the external test board for analog output testing;

[0009] The analog input test circuit is connected to the main chip and the external tested board for analog input testing.

[0010] Furthermore, the power module includes: a first step-down circuit, an isolation circuit, a second step-down circuit, and a first connection terminal;

[0011] The first step-down circuit is used to convert the 24V voltage into a 5V voltage;

[0012] The isolation circuit is connected to the first step-down circuit;

[0013] The second step-down circuit is connected to the first step-down circuit and is used to convert the 5V voltage to 3.3V;

[0014] The first connecting terminal is connected to the second step-down circuit and an external board under test.

[0015] Furthermore, the first step-down circuit includes: a DC power interface, an input interface, a fuse, a first diode, a power chip, an inductor, a thermistor, a first capacitor, a second capacitor, a second diode, a third capacitor, a fourth capacitor, a first LED lamp, a first resistor, a second resistor, and a third resistor;

[0016] Pin 1 of the input interface is connected to the DC power interface, and pin 2 of the input interface is connected to pin 1 of the power chip via a fuse and a first diode in sequence;

[0017] One end of the inductor is connected to pin 2 of the power chip, and the other end is connected to the isolation circuit and the second step-down circuit;

[0018] One end of the thermistor is connected between the fuse and the first diode, and the other end is grounded;

[0019] One end of the first capacitor is connected between the first diode and pin 1 of the power chip, and the other end is grounded;

[0020] One end of the second capacitor is connected between one end of the first capacitor and pin 1 of the power chip, and the other end is grounded;

[0021] One end of the second diode is connected between pin 2 of the power chip and the inductor, and the other end is connected to pin 3 of the power chip and grounded;

[0022] One end of the third capacitor is connected to the other end of the inductor, and the other end is grounded;

[0023] One end of the fourth capacitor is connected to one end of the third capacitor, and the other end is grounded;

[0024] One end of the first LED lamp is connected to one end of the fourth capacitor, and the other end is grounded via the first resistor;

[0025] One end of the second resistor is connected to pin 3 of the power chip, and the other end is grounded;

[0026] One end of the third resistor is connected to pin 3 of the power chip, and the other end is connected to the isolation circuit and the second step-down circuit.

[0027] Furthermore, the isolation circuit includes: an isolation power chip, a fifth capacitor, a sixth capacitor, a seventh capacitor, and an eighth capacitor;

[0028] Pin 1 of the isolated power supply chip is connected to the first step-down circuit;

[0029] One end of the fifth capacitor is connected to the first step-down circuit, and the other end is grounded;

[0030] One end of the sixth capacitor is connected between one end of the fifth capacitor and pin 1 of the isolation power chip, and the other end is grounded;

[0031] One end of the sixth capacitor is connected to pin 4 of the isolation power chip, and the other end is grounded;

[0032] The seventh capacitor is connected in parallel with the sixth capacitor.

[0033] Furthermore, the second step-down circuit includes: a linear regulator, a fourth resistor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a second LED lamp, and a fifth resistor;

[0034] Pin 3 of the linear regulator is connected to the first step-down circuit;

[0035] One end of the ninth capacitor is connected to the first step-down circuit, and the other end is grounded;

[0036] One end of the tenth capacitor is connected to pins 2 and 4 of the linear regulator, and the other end is grounded;

[0037] The eleventh capacitor is connected in parallel with the tenth capacitor;

[0038] One end of the second LED lamp is connected to pins 2 and 4 of the linear regulator, and the other end is grounded via a fifth resistor.

[0039] Furthermore, the high-frequency test circuit includes: a second terminal, a photocoupler, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, and a fifteenth resistor;

[0040] The second terminal is connected to the external board under test;

[0041] Pins 1 to 5 and 10 of the optocoupler are connected to the second terminal through the sixth resistor, the seventh resistor, the eighth resistor, the ninth resistor, the tenth resistor, and the eleventh resistor, respectively. Pins 7, 12, 14, and 16 of the optocoupler are connected to the power module through the twelfth resistor, the thirteenth resistor, the fourteenth resistor, and the fifteenth resistor, respectively. The optocoupler is connected to the main chip.

[0042] Furthermore, the relay switch function test circuit includes: a third wiring terminal, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a fourth wiring terminal, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, a twenty-ninth resistor, a thirtieth resistor, a thirty-first resistor, a thirty-second resistor, a thirty-third resistor, a thirty-fourth resistor, a thirty-fifth resistor, and a thirty-sixth resistor;

[0043] The third terminal is connected to the external board under test. Pins 1 to 9 of the third terminal are connected to the main chip through the 16th, 17th, 18th, 19th, 20th, 21st, 22nd, 23rd, and 24th resistors, respectively. Pins 11 and 12 of the third terminal are connected to the power module through the 25th resistor.

[0044] The fourth terminal is connected to the external tested board, and pins 1 to 10 of the fourth terminal are connected to the main chip through the twenty-sixth resistor, the twenty-seventh resistor, the twenty-eighth resistor, the twenty-ninth resistor, the 30th resistor, the thirty-first resistor, the thirty-second resistor, the thirty-third resistor, the thirty-fourth resistor, and the thirty-fifth resistor, respectively. Pins 11 and 12 of the fourth terminal are connected to the power module through the thirty-sixth resistor.

[0045] Furthermore, the analog output test circuit includes: a connector, a thirty-seventh resistor, a thirty-eighth resistor, a thirty-ninth resistor, a fortieth resistor, a forty-first resistor, a forty-second resistor, a forty-third resistor, and a forty-fourth resistor;

[0046] The connector is connected to the external board under test, and pins 1 to 4 of the connector are connected to the main chip through the 37th resistor, the 38th resistor, the 39th resistor, and the 40th resistor respectively;

[0047] One end of the 41st resistor, the 42nd resistor, the 43rd resistor and the 44th resistor are connected to the 37th resistor, the 38th resistor, the 39th resistor and the 40th resistor respectively, and the other end of the 41st resistor, the 42nd resistor, the 43rd resistor and the 44th resistor are grounded.

[0048] Furthermore, the analog input test circuit includes: a fifth terminal, a first relay, a forty-fifth resistor, a third LED lamp, a twelfth capacitor, a forty-sixth resistor, a second relay, a forty-seventh resistor, a fourth LED lamp, a thirteenth capacitor, and a forty-eighth resistor;

[0049] The fifth terminal is connected to the external tested board, the first relay, and the second relay;

[0050] One end of the forty-fifth resistor is connected to one end of the twelfth capacitor and then to the first relay, and the other end of the forty-fifth resistor is connected to the power module via the third LED lamp;

[0051] The other end of the twelfth capacitor is connected to the power module via a forty-sixth resistor;

[0052] One end of the forty-seventh resistor is connected to the thirteenth capacitor and then to the second relay, and the other end of the forty-seventh resistor is connected to the power module via the fourth LED lamp;

[0053] The other end of the thirteenth capacitor is connected to the power module via a forty-eighth resistor;

[0054] The relay driving chip is connected to the first relay, the second relay and the main chip.

[0055] Furthermore, it also includes: a serial port screen circuit and a buzzer circuit;

[0056] The serial port screen circuit is connected to the main chip and the external display screen;

[0057] The buzzer circuit is connected to the main chip.

[0058] According to an embodiment of the present invention, a test circuit for the functional output of a remote control PCBA is designed to fully verify all functional outputs of the PCBA and effectively filter out problem points, thereby helping the production team to quickly screen defective products, thereby reducing the use risk and after-sales costs of the final product.

[0059] It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the technology as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1 The following is a circuit diagram of a main chip of a test circuit for a remote control PCBA function output according to an embodiment of the present invention.

[0061] Figure 2 The figure is a circuit diagram of a power module of a test circuit for a remote control PCBA function output according to an embodiment of the present invention.

[0062] Figure 3 The present invention is a circuit diagram of a first connection of a test circuit for a remote control PCBA function output according to an embodiment of the present invention.

[0063] Figure 4 The figure is a circuit diagram of a high-frequency test circuit of a remote control PCBA function output test circuit according to an embodiment of the present invention.

[0064] Figure 5 The following is a circuit diagram of a relay switch function test circuit of a remote control PCBA function output test circuit according to an embodiment of the present invention.

[0065] Figure 6 The following is a circuit diagram of an analog output test circuit of a remote control PCBA function output test circuit according to an embodiment of the present invention.

[0066] Figure 7 The following is a circuit diagram of an analog input test circuit for a remote control PCBA function output test circuit according to an embodiment of the present invention.

[0067] Figure 8 This is a circuit diagram of a serial port screen circuit and a buzzer circuit of a test circuit for a remote control PCBA function output according to an embodiment of the present invention. DETAILED DESCRIPTION

[0068] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to further illustrate the present invention.

[0069] First, combine Figures 1 to 8 A test circuit for the function output of a remote control PCBA according to an embodiment of the present invention is described. The circuit is used to test the remote control PCBA (hereinafter referred to as the "tested board") and has a wide range of application scenarios.

[0070] like Figures 1 to 8 As shown, a remote control PCBA function output test circuit of an embodiment of the present invention comprises a main chip 2U1, a power module, a high-frequency test circuit, a relay switch function test circuit, an analog output test, a serial port transceiver circuit, and an analog input test circuit;

[0071] Specifically, if Figure 1 As shown, the main chip 2U1 is used for data processing. 2JP1 is the program burning port, and the KEY3 and KEY4 networks of the 2JP2 terminal control the main power switch and test switch respectively.

[0072] Specifically, if Figures 2 and 3 As shown, the power module is connected to the main chip 2U1 and is used to power the main chip 2U1 and the external board under test. The power module includes: a first step-down circuit, an isolation circuit, a second step-down circuit, and a first terminal 3J1. The first step-down circuit is used to convert the 24V voltage to 5V; the isolation circuit is connected to the first step-down circuit; the second step-down circuit is connected to the first step-down circuit to convert the 5V voltage to 3.3V; the first terminal 3J1 is connected to the second step-down circuit and the external board under test. The first terminal 3J1 also connects the 24V input to the board under test for power supply. The NO_J and NC_J networks are the normally open and normally closed terminals for the emergency stop function, respectively, and COMJT is the com terminal for the emergency stop function.

[0073] Further, if Figure 2As shown, the first step-down circuit includes: a DC power interface DC-IN1, an input interface BAT-IN1, a fuse 1F1, a first diode D1, a power chip 1U1, an inductor L1, a thermistor RT1, a first capacitor 1C1, a second capacitor 1C2, a second diode D2, a third capacitor 1C3, a fourth capacitor 1C4, a first LED lamp LED1, a first resistor 1R3, a second resistor 1R1 and a third resistor 1R2; pin 1 of the input interface BAT-IN1 is connected to the DC power interface DC-IN1, and pin 2 of the input interface BAT-IN1 is connected to pin 1 of the power chip 1U1 via the fuse 1F1 and the first diode D1 in sequence; one end of the inductor L1 is connected to pin 2 of the power chip 1U1, and the other end is connected to the isolation circuit and the second step-down circuit; one end of the thermistor RT1 is connected between the fuse 1F1 and the first diode D1, and the other end is grounded; the first capacitor One end of 1C1 is connected between the first diode D1 and pin 1 of the power chip 1U1, and the other end is grounded. One end of the second capacitor 1C2 is connected between one end of the first capacitor 1C1 and pin 1 of the power chip 1U1, and the other end is grounded. One end of the second diode D2 is connected between pin 2 of the power chip 1U1 and the inductor L1, and the other end is connected to pin 3 of the power chip 1U1 and grounded. One end of the third capacitor 1C3 is connected to the other end of the inductor L1 and the other end is grounded. One end of the fourth capacitor 1C4 is connected to one end of the third capacitor 1C3 and the other end is grounded. One end of the first LED lamp LED1 is connected to one end of the fourth capacitor 1C4 and the other end is grounded via the first resistor 1R3. One end of the second resistor 1R1 is connected to pin 3 of the power chip 1U1 and the other end is grounded. One end of the third resistor 1R2 is connected to pin 3 of the power chip 1U1 and the other end is connected to the isolation circuit and the second step-down circuit. The DC power interface DC-IN1 inputs 24V, which is converted to 5V by the power chip 1U1.

[0074] Further, if Figure 2 As shown, the isolation circuit includes: an isolated power supply chip 1U2, a fifth capacitor 1C11, a sixth capacitor 1C5, a seventh capacitor 1C6, and an eighth capacitor 1C7; pin 1 of the isolated power supply chip 1U2 is connected to the first step-down circuit; one end of the fifth capacitor 1C11 is connected to the first step-down circuit, and the other end is grounded; one end of the sixth capacitor 1C5 is connected between one end of the fifth capacitor 1C11 and pin 1 of the isolated power supply chip 1U2, and the other end is grounded; one end of the sixth capacitor 1C5 is connected to pin 4 of the isolated power supply chip 1U2, and the other end is grounded; the seventh capacitor 1C6 is connected in parallel with the sixth capacitor 1C5. The 5V network V50 is transferred to the isolated 5V network ISO1-+5V through the isolated power supply chip 1U2.

[0075] Further, if Figure 2As shown, the second step-down circuit includes: a linear regulator 1U3, a ninth capacitor 1C8, a tenth capacitor 1C9, an eleventh capacitor 1C10, a second LED lamp LED2, and a fifth resistor 1R4. Pin 3 of the linear regulator 1U3 is connected to the first step-down circuit; one end of the ninth capacitor 1C8 is connected to the first step-down circuit, and the other end is grounded; one end of the tenth capacitor 1C9 is connected to pins 2 and 4 of the linear regulator 1U3, and the other end is grounded; the eleventh capacitor 1C10 and the tenth capacitor 1C9 are connected in parallel; one end of the second LED lamp LED2 is connected to pins 2 and 4 of the linear regulator 1U3, and the other end is grounded via the fifth resistor 1R4. The 5V network V50 is converted to 3.3V via the linear regulator 1U3.

[0076] Specifically, if Figure 4 As shown, the high-frequency test circuit is connected to the main chip 2U1 and the external tested board for high-frequency testing. The high-frequency test circuit includes: a second terminal 4J1, an optocoupler 4U1, a sixth resistor 4R1, a seventh resistor 4R5, an eighth resistor 4R2, a ninth resistor 4R6, a tenth resistor 4R3, an eleventh resistor 4R4, a twelfth resistor 4R10, a thirteenth resistor 4R9, a fourteenth resistor 4R8, and a fifteenth resistor 4R7. The second terminal 4J1 is connected to an external board under test. Pins 1 to 5 and 10 of the optocoupler 4U1 are connected to the second terminal 4J1 via the sixth resistor 4R1, the seventh resistor 4R5, the eighth resistor 4R2, the ninth resistor 4R6, the tenth resistor 4R3, and the eleventh resistor 4R4, respectively. Pins 7, 12, 14, and 16 of the optocoupler 4U1 are connected to the power module via the twelfth resistor 4R10, the thirteenth resistor 4R9, the fourteenth resistor 4R8, and the fifteenth resistor 4R7, respectively. The optocoupler 4U1 is connected to the main chip 2U1. The second terminal 4J1 is a test port for high-frequency testing of the board under test.

[0077] Specifically, if Figure 5As shown, the relay switch function test circuit is connected to the main chip 2U1 and the external tested board for relay switch function testing. The relay switch function test circuit includes: a third terminal 6J1, a sixteenth resistor 6R10, a seventeenth resistor 6R1, an eighteenth resistor 6R2, a nineteenth resistor 6R3, a twentieth resistor 6R4, a twenty-first resistor 6R5, a twenty-second resistor 6R6, a twenty-third resistor 6R7, a twenty-fourth resistor 6R8, a twenty-fifth resistor 6R9, ​​a fourth terminal 6J2, a twenty-sixth resistor 6R20, a twenty-seventh resistor 6R11, a twenty-eighth resistor 6R12, a twenty-ninth resistor 6R13, a thirtieth resistor 6R14, a thirty-first resistor 6R15, a thirty-second resistor 6R16, a thirty-third resistor 6R17, a thirty-fourth resistor 6R18, a thirty-fifth resistor 6R19, and a thirty-sixth resistor 6R21; the third terminal 6J1 is connected to an external board under test, and pins 1 to 9 of the third terminal 6J1 are connected to the sixteenth resistor 6R10 and the seventeenth resistor 6R1 through the pins 1 to 9 of the third terminal 6J1, respectively. The eighteenth resistor 6R2, the nineteenth resistor 6R3, the twentieth resistor 6R4, the twenty-first resistor 6R5, the twenty-second resistor 6R6, the twenty-third resistor 6R7, and the twenty-fourth resistor 6R8 are connected to the main chip 2U1, and pins 11 and 12 of the third terminal 6J1 are connected to the power module through the twenty-fifth resistor 6R9. The fourth terminal 6J2 is connected to the external tested board, and pins 1 to 10 of the fourth terminal 6J2 are connected to the main chip 2U1 through the twenty-sixth resistor 6R20, the twenty-seventh resistor 6R11, the twenty-eighth resistor 6R12, the twenty-ninth resistor 6R13, the thirtieth resistor 6R14, the thirty-first resistor 6R15, the thirty-second resistor 6R16, the thirty-third resistor 6R17, the thirty-fourth resistor 6R18, and the thirty-fifth resistor 6R19, respectively. Pins 11 and 12 of the fourth terminal 6J2 are connected to the power module through the thirty-sixth resistor 6R21. The third terminal 6J1 and the fourth terminal 6J2 are test ports for the relay switch function of the tested board.

[0078] Specifically, if Figure 6As shown, the analog output test circuit is connected to the main chip 2U1 and an external board under test for analog output testing. The analog output test circuit includes: a connector 9J1, a 37th resistor 9R1, a 38th resistor 9R2, a 39th resistor 9R3, a 40th resistor 9R4, a 41st resistor 9R5, a 42nd resistor 9R6, a 43rd resistor 9R7, and a 44th resistor 9R8. Connector 9J1 is connected to the external board under test. Pins 1-4 of connector 9J1 are connected to the main chip 2U1 via the 37th resistor 9R1, the 38th resistor 9R2, the 39th resistor 9R3, and the 40th resistor 9R4, respectively. One end of the 41st resistor 9R5, the 42nd resistor 9R6, the 43rd resistor 9R7, and the 44th resistor 9R8 are connected to the 37th resistor 9R1, the 38th resistor 9R2, the 39th resistor 9R3, and the 40th resistor 9R4, respectively. The other ends of the 41st resistor 9R5, the 42nd resistor 9R6, the 43rd resistor 9R7, and the 44th resistor 9R8 are grounded. Among them Figure 6 As shown, the DAOUTPUT1-4 network is used to test the analog output of the PCBA. Through resistor voltage division, the network is connected to the IO port of the main chip 2U1 to detect high and low level changes.

[0079] Specifically, if Figure 7 As shown, the analog input test circuit is connected to the main chip 2U1 and the external test board for analog input testing. The analog input test circuit includes: a fifth terminal 8J1, a first relay K1, a 45th resistor 8R3, a third LED lamp LED3, a 12th capacitor 8C2, a 46th resistor 8R4, a second relay K2, a 47th resistor 8R1, a fourth LED lamp LED4, a 13th capacitor 8C1, and a 48th resistor 8R2; the fifth terminal 8J1 is connected to the external test board, the first relay K1, and the second relay K2; one end of the 45th resistor 8R3 is connected to one end of the 12th capacitor 8C2, and then to the first relay K1. The other end of the 45th resistor 8R3 is connected to the power module via the third LED lamp LED3; the other end of the 12th capacitor 8C2 is connected to the power module via the 46th resistor 8R4; one end of the 47th resistor 8R1 is connected to the 13th capacitor 8C1 and then to the second relay K2, and the other end of the 47th resistor 8R1 is connected to the power module via the fourth LED lamp LED4; the other end of the 33th capacitor 8C1 is connected to the power module via the 48th resistor 8R2. The relay driver chip is connected to the first relay K1, the second relay K2, and the main chip 2U1. When the start test button is pressed, the sampling pins ANALOG and PULSE network are connected to the 5V network V50 through relays K1 and K2, and connected to the analog input function of the tested board through the fifth terminal 8J1 to perform the test.

[0080] Further, if Figure 8 As shown, a test circuit for the function output of a remote control PCBA in an embodiment of the present invention further includes: a serial port screen circuit and a buzzer circuit; the serial port screen circuit is connected to the main chip 2U1 and an external display screen for data communication; the buzzer circuit is connected to the main chip 2U1 for alarm.

[0081] Above, refer to Figures 1 to 8 This utility model describes a test circuit for the functional outputs of a remote control PCBA. This circuit is designed to comprehensively verify all functional outputs of the PCBA and effectively filter out problematic areas, helping production teams quickly screen defective products, thereby reducing the use risk and after-sales costs of the final product.

[0082] It should be noted that, in this specification, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, elements defined by the phrase "comprising..." do not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the elements.

[0083] Although the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as limiting the present invention. After reading the above description, various modifications and alternatives to the present invention will be readily apparent to those skilled in the art. Therefore, the scope of protection of the present invention shall be defined by the appended claims.

Claims

1. A test circuit for remote control PCBA function output, characterized in that: Contains: main chip, power module, high-frequency test circuit, relay switch function test circuit, analog output test, serial port transceiver circuit and analog input test circuit; The main chip is used for data processing; The power module is connected to the main chip and is used to supply power to the main chip and an external board under test; The high-frequency test circuit is connected to the main chip and an external board under test for high-frequency testing; The relay switch function test circuit is connected to the main chip and the external tested board for relay switch function testing; The analog output test is connected to the main chip and the external tested board for analog output testing; The analog input test circuit is connected to the main chip and an external board under test and is used for analog input testing.

2. The test circuit for the remote control PCBA function output as claimed in claim 1, characterized in that: The power module includes: a first step-down circuit, an isolation circuit, a second step-down circuit and a first connection terminal; The first step-down circuit is used to convert the 24V voltage into a 5V voltage; The isolation circuit is connected to the first step-down circuit; The second step-down circuit is connected to the first step-down circuit and is used to convert the 5V voltage to 3.3V; The first connection terminal is connected to the second step-down circuit and an external board under test.

3. The test circuit for the remote control PCBA function output as claimed in claim 2, characterized in that: The first step-down circuit includes: a DC power interface, an input interface, a fuse, a first diode, a power chip, an inductor, a thermistor, a first capacitor, a second capacitor, a second diode, a third capacitor, a fourth capacitor, a first LED lamp, a first resistor, a second resistor, and a third resistor; Pin 1 of the input interface is connected to the DC power interface, and pin 2 of the input interface is connected to pin 1 of the power chip via the fuse and the first diode in sequence; One end of the inductor is connected to pin 2 of the power chip, and the other end is connected to the isolation circuit and the second step-down circuit; One end of the thermistor is connected between the fuse and the first diode, and the other end is grounded; One end of the first capacitor is connected between the first diode and pin 1 of the power chip, and the other end is grounded; One end of the second capacitor is connected between one end of the first capacitor and pin 1 of the power chip, and the other end is grounded; One end of the second diode is connected between pin 2 of the power chip and the inductor, and the other end is connected to pin 3 of the power chip and grounded; One end of the third capacitor is connected to the other end of the inductor, and the other end is grounded; One end of the fourth capacitor is connected to one end of the third capacitor, and the other end is grounded; One end of the first LED lamp is connected to one end of the fourth capacitor, and the other end is grounded via the first resistor; One end of the second resistor is connected to pin 3 of the power chip, and the other end is grounded; One end of the third resistor is connected to pin 3 of the power chip, and the other end is connected to the isolation circuit and the second step-down circuit.

4. The test circuit for the remote control PCBA function output as claimed in claim 2, characterized in that: The isolation circuit includes: an isolation power chip, a fifth capacitor, a sixth capacitor, a seventh capacitor and an eighth capacitor; Pin 1 of the isolated power supply chip is connected to the first step-down circuit; One end of the fifth capacitor is connected to the first step-down circuit, and the other end is grounded; One end of the sixth capacitor is connected between one end of the fifth capacitor and pin 1 of the isolation power chip, and the other end is grounded; One end of the sixth capacitor is connected to pin 4 of the isolation power chip, and the other end is grounded; The seventh capacitor is connected in parallel with the sixth capacitor.

5. The test circuit for the remote control PCBA function output as claimed in claim 2, characterized in that: The second step-down circuit includes: a linear regulator, a fourth resistor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a second LED lamp, and a fifth resistor; Pin 3 of the linear regulator is connected to the first step-down circuit; One end of the ninth capacitor is connected to the first step-down circuit, and the other end is grounded; One end of the tenth capacitor is connected to pins 2 and 4 of the linear regulator, and the other end is grounded; The eleventh capacitor is connected in parallel with the tenth capacitor; One end of the second LED lamp is connected to pins 2 and 4 of the linear regulator, and the other end is grounded via the fifth resistor.

6. The test circuit for the remote control PCBA function output as claimed in claim 1, characterized in that: The high-frequency test circuit includes: a second terminal, a photocoupler, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, and a fifteenth resistor; The second terminal is connected to an external board under test; Pins 1 to 5 and 10 of the optocoupler are respectively connected to the second wiring terminal through the sixth resistor, the seventh resistor, the eighth resistor, the ninth resistor, the tenth resistor, and the eleventh resistor, and pins 7, 12, 14, and 16 of the optocoupler are respectively connected to the power module through the twelfth resistor, the thirteenth resistor, the fourteenth resistor, and the fifteenth resistor, and the optocoupler is connected to the main chip.

7. The test circuit for the remote control PCBA function output as claimed in claim 1, characterized in that: The relay switch function test circuit includes: a third wiring terminal, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a fourth wiring terminal, a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, a twenty-ninth resistor, a thirtieth resistor, a thirty-first resistor, a thirty-second resistor, a thirty-third resistor, a thirty-fourth resistor, a thirty-fifth resistor, and a thirty-sixth resistor; The third terminal is connected to an external board under test, and pins 1 to 9 of the third terminal are connected to the main chip through the sixteenth resistor, the seventeenth resistor, the eighteenth resistor, the nineteenth resistor, the twentieth resistor, the twenty-first resistor, the twenty-second resistor, the twenty-third resistor, and the twenty-fourth resistor, respectively. Pins 11 and 12 of the third terminal are connected to the power module through the twenty-fifth resistor; The fourth terminal is connected to the external tested board, and pins 1 to 10 of the fourth terminal are respectively connected to the main chip through the twenty-sixth resistor, the twenty-seventh resistor, the twenty-eighth resistor, the twenty-ninth resistor, the 30th resistor, the thirty-first resistor, the thirty-second resistor, the thirty-third resistor, the thirty-fourth resistor, and the thirty-fifth resistor, and pins 11 and 12 of the fourth terminal are connected to the power module through the thirty-sixth resistor.

8. The test circuit for the remote control PCBA function output as claimed in claim 1, characterized in that: The analog output test circuit includes: a connector, a thirty-seventh resistor, a thirty-eighth resistor, a thirty-ninth resistor, a fortieth resistor, a forty-first resistor, a forty-second resistor, a forty-third resistor, and a forty-fourth resistor; The connector is connected to an external board under test, and pins 1 to 4 of the connector are connected to the main chip through the thirty-seventh resistor, the thirty-eighth resistor, the thirty-ninth resistor, and the fortieth resistor, respectively; One end of the forty-first resistor, the forty-second resistor, the forty-third resistor and the forty-fourth resistor are respectively connected to the thirty-seventh resistor, the thirty-eighth resistor, the thirty-ninth resistor and the fortieth resistor, and the other end of the forty-first resistor, the forty-second resistor, the forty-third resistor and the forty-fourth resistor are grounded.

9. The test circuit for the remote control PCBA function output as claimed in claim 1, characterized in that: The analog input test circuit includes: a fifth terminal, a first relay, a forty-fifth resistor, a third LED lamp, a twelfth capacitor, a forty-sixth resistor, a second relay, a forty-seventh resistor, a fourth LED lamp, a thirteenth capacitor, a forty-eighth resistor, and a relay driver chip; The fifth terminal is connected to the external tested board, the first relay, and the second relay; One end of the forty-fifth resistor is connected to one end of the twelfth capacitor and then connected to the first relay, and the other end of the forty-fifth resistor is connected to the power module via the third LED lamp; The other end of the twelfth capacitor is connected to the power module via the forty-sixth resistor; One end of the forty-seventh resistor is connected to the thirteenth capacitor and then to the second relay, and the other end of the forty-seventh resistor is connected to the power module via the fourth LED lamp; The other end of the thirteenth capacitor is connected to the power module via the forty-eighth resistor; The relay driving chip is connected to the first relay, the second relay, and the main chip.

10. The remote control PCBA function output test circuit according to claim 1, characterized in that: Also includes: serial port screen circuit and buzzer circuit; The serial port screen circuit is connected to the main chip and the external display screen; The buzzer circuit is connected to the main chip.

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