CN217789652U

CN217789652U - PCBA integrated circuit board outgoing burning switching circuit

Info

Publication number: CN217789652U
Application number: CN202221958457.XU
Authority: CN
Inventors: 徐鹏; 丁琴
Original assignee: China Key System and Integrated Circuit Co Ltd
Current assignee: China Key System and Integrated Circuit Co Ltd
Priority date: 2022-07-27
Filing date: 2022-07-27
Publication date: 2022-11-11
Anticipated expiration: 2032-07-27

Abstract

The utility model discloses a PCBA board outgoing burning switching circuit, which belongs to the field of digital circuits, wherein a switching signal is simultaneously connected with bases of triodes Q3, Q2 and Q4; the collector of the Q3 is connected with the first end of the capacitor C1 through the resistor R4, and the second end of the capacitor C1 is connected with a +5V power supply; two ends of the capacitor R2 are respectively connected with the first end and the second end of the capacitor C1; an input positive electrode and an input negative electrode of the optocoupler U1 are respectively connected in parallel with two ends of the resistor R2, an output collector of the optocoupler U1 is connected with a +24V power supply through the resistor R1, and an output emitter is grounded GND through the resistor R3; the base electrode of the Q1 is connected with an output emitter electrode of the optocoupler U1, the collector electrode is connected with a +24V power supply through a diode D1, and the emitter electrode is grounded GND; an emitter of the Q2 is connected with a +5V power supply, and a collector is grounded to GND through a resistor R6 and an indicator light LED0 in sequence; the collector of the Q4 is connected with the cathode of the indicator light LED1, and the emitter is grounded GND; the anode of the indicator light LED1 is connected with a +5V power supply through a resistor R5. The utility model discloses can realize the test procedure of PCBA integrated circuit board and normally dispatch from the factory program intelligence and switch the burning record.

Description

PCBA integrated circuit board leaves factory and burns record switching circuit

Technical Field

The utility model relates to a digital circuit technical field, in particular to PCBA integrated circuit board dispatches from factory and burns record switching circuit.

Background

At present, with the functional diversity and complexity of the PCBA board, the PCBA board generally needs to pass through the test program check function and then be restored to the normal program for delivery.

At present, a processing plant generally uses manual operation, a burning test program is required to be firstly carried out, the test is completed, then the factory program is manually switched, manpower and material resources are wasted, and the processing plant is relatively troublesome. The design circuit provides a scheme for intelligently switching and burning a test program and a normal factory program.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a PCBA integrated circuit board dispatches from factory and burns record switching circuit to solve the problem in the background art.

In order to solve the technical problem, the utility model provides a PCBA board outgoing burn switching circuit, which comprises resistors R1-R6, triodes Q1-Q4, a capacitor C1, a diode D1, an optocoupler U1, a double-pole double-throw relay K1 and indicator lamps LED 0-LED 1;

the Switching signal is simultaneously connected with the base electrode of the triode Q3, the base electrode of the triode Q2 and the base electrode of the triode Q4; the collector of the triode Q3 is connected with the first end of a capacitor C1 through a resistor R4, and the second end of the capacitor C1 is connected with a +5V power supply; two ends of the capacitor R2 are respectively connected with the first end and the second end of the capacitor C1; an input anode and an input cathode of the optocoupler U1 are respectively connected in parallel at two ends of the resistor R2, an output collector of the optocoupler U1 is connected with a +24V power supply through the resistor R1, and an output emitter is connected with a GND through a resistor R3; the base electrode of the triode Q1 is connected with the output emitter electrode of the optocoupler U1, the collector electrode is connected with a +24V power supply through a diode D1, and the emitter electrode is grounded GND;

an emitting electrode of the triode Q2 is connected with a +5V power supply, and a collector electrode of the triode Q2 is grounded to GND through a resistor R6 and an indicator light LED0 in sequence; the collector of the triode Q4 is connected with the cathode of the indicator light LED1, and the emitter is grounded GND; the positive pole of pilot lamp LED1 connects +5V power through resistance R5.

In one embodiment, the double-pole double-throw relay K1 is configured to connect ports PCBA _ DIO and PCBA _ CLK of the PCBA board to the TEST program burning signals TEST _ DIO and TEST _ CLK, respectively, or to the NORMAL factory program burning signals NORMAL _ DIO and NORMAL _ CLK, respectively.

In an embodiment, the resistors R1, R4, R5, and R6 are current-limiting resistors, the resistor R2 is configured to prevent the optocoupler U1 from being turned on by mistake, and the resistor R3 is a pull-down resistor.

In one embodiment, the capacitor C1 is a filter capacitor.

In one embodiment, the diode D1 is a freewheeling diode.

In one embodiment, the transistors Q1, Q3, and Q4 are NPN transistors, and the transistor Q2 is a PNP transistor.

The PCBA board outgoing burning switching circuit provided by the utility model can realize the intelligent switching burning of the test program and the normal outgoing program of the PCBA board; and the circuit is simple and the cost is low.

Drawings

Fig. 1 is a schematic diagram of a PCBA board factory burn switching circuit structure provided by the present invention;

fig. 2 is the utility model provides a pair of PCBA integrated circuit board dispatches from factory and burns record switching circuit's theory of operation schematic diagram.

Detailed Description

The following describes the PCBA board factory burn switching circuit in further detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more fully apparent from the following description and appended claims. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.

The utility model provides a PCBA board outgoing burning switching circuit, which comprises resistors R1-R6, triodes Q1-Q4, a capacitor C1, a diode D1, an optocoupler U1, a double-pole double-throw relay K1 and indicator lamps LED 0-LED 1;

the Switching signal is simultaneously connected with the base electrode of the triode Q3, the base electrode of the triode Q2 and the base electrode of the triode Q4; the collector of the triode Q3 is connected with the first end of a capacitor C1 through a resistor R4, and the second end of the capacitor C1 is connected with a +5V power supply; two ends of the capacitor R2 are respectively connected with the first end and the second end of the capacitor C1; an input positive electrode and an input negative electrode of the optical coupler U1 are respectively connected in parallel at two ends of the resistor R2, an output collector of the optical coupler U1 is connected with a +24V power supply through the resistor R1, and an output emitter is grounded GND through the resistor R3. The base electrode of the triode Q1 is connected with the output emitter electrode of the optocoupler U1, the collector electrode is connected with a +24V power supply through a diode D1, and the emitter electrode is grounded GND.

The working principle of the PCBA board factory burning switching circuit is shown in figure 2 and comprises 2 steps of testing program burning and normal factory program burning. Please refer to fig. 1 and fig. 2, when the Switching signal is at a low level of 0V, the transistor Q3 is not turned on, the optocoupler U1 does not work, the transistor Q1 is not turned on, the normally closed double-pole double-throw relay K1 does not operate, the TEST program burning signals TEST _ DIO and TEST _ CLK are respectively connected with ports PCBA _ DIO and PCBA _ CLK of the PCBA board card to burn the TEST program, at this time, the transistor Q2 is turned on, the indicator light LED0 is on, and the TEST program is indicated to burn.

When the Switching signal is at a high level of 5V, the triode Q3 is conducted, the optocoupler U1 is conducted in work, the triode Q1 is conducted, the normally closed double-pole double-throw relay K1 acts, and the NORMAL factory program burning signals NORMAL _ DIO and NORMAL _ CLK are respectively connected with ports of PCBA _ DIO and PCBA _ CLK of the PCBA board card, so that the NORMAL factory program burning is carried out, at the moment, the triode Q4 is conducted, the indicator lamp LED1 is on, and the NORMAL factory program burning is indicated.

The utility model provides a PCBA integrated circuit board dispatches from factory and burns record switching circuit can realize that the test program of PCBA integrated circuit board and normal procedure intelligence that dispatches from factory switch the burning record, circuit structure is simple, low cost.

The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and any modification and modification made by those skilled in the art according to the above disclosure are all within the scope of the claims.

Claims

1. A PCBA board outgoing burning switching circuit is characterized by comprising resistors R1-R6, triodes Q1-Q4, a capacitor C1, a diode D1, an optocoupler U1, a double-pole double-throw relay K1 and indicator lamps LED 0-LED 1;

an emitting electrode of the triode Q2 is connected with a +5V power supply, and a collector electrode of the triode Q2 is grounded to GND through a resistor R6 and an indicator light LED0 in sequence; the collector of the triode Q4 is connected with the cathode of the indicator light LED1, and the emitter is grounded GND; the anode of the indicator light LED1 is connected with a +5V power supply through a resistor R5.

2. The factory burn switching circuit of a PCBA board as recited in claim 1, wherein the double-pole double-throw relay K1 is configured to connect the ports PCBA _ DIO and PCBA _ CLK of the PCBA board to the TEST program burn signals TEST _ DIO and TEST _ CLK, respectively, or to the NORMAL factory program burn signals NORMAL _ DIO and NORMAL _ CLK, respectively.

3. The PCBA board factory burning switching circuit according to claim 1, wherein the resistors R1, R4, R5 and R6 are current limiting resistors, the resistor R2 is used for preventing the optocoupler U1 from being conducted mistakenly, and the resistor R3 is a pull-down resistor.

4. The PCBA board factory burn switching circuit as in claim 1, wherein the capacitor C1 is a filter capacitor.

5. The PCBA board factory burn switching circuit as in claim 1, wherein the diode D1 is a freewheeling diode.

6. The PCBA board factory burn switching circuit as in claim 1, wherein the transistors Q1, Q3, Q4 are NPN transistors, and the transistor Q2 is a PNP transistor.