Self-locking circuit of passive output test tool
By designing a self-locking circuit combining MOS tubes and resistors and capacitors in the passive output test tooling, the problems of unstable, inability to self-lock and high cost in traditional circuits are solved, and the stable display and adaptability testing requirements of signals are achieved.
Patent Information
- Application Number
- CN202421645593.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-12
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-07-12
AI Technical Summary
Traditional passive output testing tooling uses simple switching circuits, which have problems such as instability, inability to self-lock, cumbersome operation and high cost, and cannot adapt to different test needs, lack flexibility and scalability.
A passive output test tool self-locking circuit is designed to realize the capture, display and hold functions of passive signals through the combination of MOS tubes and some resistors and capacitors, and realize the self-locking of circuit voltage.
It realizes the normal status and display function of the signal, reduces cost, reduces volume, facilitates installation and maintenance, works independently, does not require MCU control, adapts to different test needs, and improves flexibility and scalability.
Smart Images
Figure CN222916010U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of self-locking circuit control, and specifically, to a self-locking circuit for a passive output test tooling. Background Art
[0002] In the current field of electronic technology, passive output test tooling is an important tool for testing the performance of electronic devices. Traditional passive output test tooling usually uses a simple switch circuit for control. However, this design has many drawbacks during the testing process. First, due to the instability of the switch circuit, it is easy to cause errors in the test results. Second, the traditional switch circuit cannot be self-locked during the testing process, which makes the tester need to manually control the switch. This is not only cumbersome to operate, but also prone to introducing errors due to human factors. In addition, in the existing technical solutions, the test tooling often cannot adapt to different test requirements, lacking flexibility and scalability.
[0003] Most conventional passive output signals use the switching of normally open / normally closed relays. Because the signals are passive and do not remain after operation, most existing test solutions use magnetic latching relays. This solution has a complex circuit, a large volume, and a high cost. Based on the above deficiencies, a self-locking circuit for passive output test tooling is designed. This circuit realizes the functions of passive signal capture, display, and holding only through MOS transistors and some resistors and capacitors. Therefore, a self-locking circuit for passive output test tooling is needed. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a self-locking circuit for a passive output test tooling.
[0005] The utility model includes a reset switch interface CN1, a power supply interface CN2, an external indication interface CN3, a signal to be measured interface CN4, and a loop module. The loop module includes a first triode Q1, a second triode Q2, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, and a second capacitor C2. The second pin of the power supply interface CN2 is connected to the emitter of the first triode Q1. The collector of the first triode Q1 is connected to the first pin of the reset switch interface CN1. The second pin of the reset switch interface CN1 is connected to the first end of the first resistor R1. The second end of the first resistor R1 is connected to the positive electrode of the first diode LED1. The base of the first triode Q1 is connected to the collector of the second triode Q2. The emitter of the second triode Q2 is grounded. The base of the second triode Q2 is connected to the second pin of the signal to be measured interface CN4 and the second pin of the fifth resistor R5 and the sixth resistor R6 after being connected in parallel. The first pin of the signal to be measured interface CN4 is connected to the emitter of the first triode Q1 through the fourth resistor.
[0006] Further, the first pin of the power interface CN2 is grounded.
[0007] Further, the negative electrode of the first diode LED1 is connected to the second pin of the external indication interface CN3 and then grounded.
[0008] The beneficial effects of the present utility model are as follows:
[0009] The present utility model provides a self-locking circuit for a passive output test tooling, which realizes the normally-on state and display function of signals by controlling the conduction and voltage self-locking of MOS transistors, has a lower cost, is conducive to batch replication production; is smaller in size, is convenient for installation and turnover, and works independently without MCU control. Description of the Drawings
[0010] Figure 1 is the circuit schematic diagram of the present utility model; Detailed Embodiments
[0011] The following further illustrates the present utility model according to the embodiments. The implementation manners of the present utility model include but are not limited to the following embodiments.
[0012] As Figure 1 shown, the present utility model includes a reset switch interface CN1, a power interface CN2, an external indication interface CN3, a signal to be measured interface CN4, and a loop module. The loop module includes a first triode Q1, a second triode Q2, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1, and a second capacitor C2; the second pin of the power interface CN2 is connected to the emitter of the first triode Q1, the collector of the first triode Q1 is connected to the first pin of the reset switch interface CN1, the second pin of the reset switch interface CN1 is connected to the first end of the first resistor R1, the second end of the first resistor R1 is connected to the positive electrode of the first diode LED1, the base of the first triode Q1 is connected to the collector of the second triode Q2, the emitter of the second triode Q2 is grounded, the base of the second triode Q2 is respectively connected to the fifth resistor R5 and the sixth resistor R6 after being connected in parallel and the second pin of the signal to be measured interface CN4, and the first pin of the signal to be measured interface CN4 is connected to the emitter of the first triode Q1 through the fourth resistor.
[0013] In this embodiment, the first pin of the power interface CN2 is grounded, and the negative electrode of the first diode LED1 is connected to the second pin of the external indication interface CN3 and then grounded.
[0014] The working principle of the present utility model is as follows: As Figure 1As shown, the interface part: CN1 (reset switch interface), CN2 (power supply interface), CN3 (external indication interface), CN4 (signal to be measured interface);
[0015] The loop part: the first triode Q1, the second triode Q2, the second resistor R2, the third resistors R3, R4, R5, R6, the first capacitor C1, the second capacitor C2;
[0016] The indication part: the first resistor R1, LED1.
[0017] This utility model divides the circuit into three states through this circuit, namely the untriggered state, the passive signal continuous state, the passive signal loss holding state, and the reset state.
[0018] In the untriggered state of this utility model, the power input interface is powered on. Since CN4 does not obtain a passive closed signal, it is in an open state. Therefore, the gate of the second triode Q2 is grounded, and the second triode Q2 is not conducting, being in an off state. Because the second triode Q2 is off, the gate and source of the first triode Q1 are both VCC, so the first triode Q1 is not conducting, being in an off state. Because the first triode Q1 is not conducting, the first resistor R1 and LED1 cannot work, the indicator light goes out, and there is no output at the external indication interface CN3.
[0019] The passive signal continuous state: CN4 obtains a passive closed signal and is in a closed state. The CN1 reset switch is in a normally closed state. At this time, the gate of the second triode Q2 obtains a voltage of VCC / 2, then the second triode Q2 conducts, and the source of the second triode Q2, that is, the gate of the first triode Q1, is grounded. Because the gate voltage of the first triode Q1 is lower than the source, the first triode Q1 conducts, the first resistor R1 and LED1 obtain voltage, LED1 lights up, and the external indication interface CN3 outputs voltage.
[0020] The passive signal loss holding state: Based on the signal continuous state, since the first triode Q1 has conducted, R5 and R6 obtain voltage. The gate voltage of the second triode Q2 is in a series-parallel state by R5, R6, and R4. At this moment, the gate voltage of the second triode Q2 is still greater than the turn-on voltage and is in a conducting state. When the passive signal is lost, at this moment, the gate voltage of the second triode Q2 is only composed of the voltage division of R5 and R6 and can still continue to conduct. Therefore, at this moment, the first resistor R1 and LED1 still obtain voltage, LED1 lights up, and the external indication interface CN3 continuously outputs voltage.
[0021] Reset state: Based on state 3), press the reset switch CN1. At this moment, the first triode Q1 is disconnected from the backend, the first resistor R1 and LED1 cannot work, the indicator light goes out, and there is no output at the external indication interface CN3. Since CN1 is disconnected, the gate of the second triode Q2 is grounded, so the second triode Q2 is turned off and does not conduct. Then, the source of the second triode Q2, which is the gate of the first triode Q1, presents VCC through the third resistor R3. The gate and source of the first triode Q1 are both VCC, and the first triode Q1 is also turned off and cannot conduct. When the reset switch CN1 is released, the first triode Q1 is connected to the backend, but since the first triode Q1 has been turned off and cannot conduct, the first resistor R1 and LED1 also cannot work, the indicator light goes out, and there is no output at the external indication interface CN3.
[0022] The utility model uses a MOS tube combination to achieve self-locking of the circuit voltage. In a self-locking manner, the test results are continuously displayed. It effectively solves the problems of the original magnetic latching relay solution, such as complex circuit, large volume, high cost, and heat generation. The circuit is simple, does not require MCU control, has accurate sampling, convenient display, simple maintenance, and is easy to batch replicate. At the same time, since the relay solution is not used, the volume is smaller and the cost is more optimal, which is convenient for installation and turnover. The circuit can also achieve automatic control of the circuit by using the second resistor R2 in combination with the power-on and power-off of VCC, which is more conducive to improving production efficiency and reducing production costs.
[0023] The above embodiments are only one of the preferred embodiments of the utility model and should not be used to limit the protection scope of the utility model. Any meaningless changes or touch-ups made on the main design concept and spirit of the utility model, as long as the technical problems solved are still the same as those of the utility model, should be included in the protection scope of the utility model.
Claims
1. A passive output test fixture self-locking circuit, comprising a reset switch interface CN1, a power interface CN2, an external indication interface CN3 and a test signal interface CN4, characterized in that: It also includes a loop module, which includes a first transistor Q1, a second transistor Q2, a first diode LED, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first capacitor C1 and a second capacitor C2; the second pin of the power supply interface CN2 is connected to the emitter of the first transistor Q1, the collector of the first transistor Q1 is connected to the first pin of the reset switch interface CN1, the second pin of the reset switch interface CN1 is connected to the first end of the first resistor R1, the second end of the first resistor R1 is connected to the positive electrode of the first diode LED1, the base of the first transistor Q1 is connected to the collector of the second transistor Q2, the emitter of the second transistor Q2 is grounded, the base of the second transistor Q2 is connected to the fifth resistor R5 and the sixth resistor R6 connected in parallel and the second pin of the signal interface CN4 to be tested, and the first pin of the signal interface CN4 to be tested is connected to the emitter of the first transistor Q1 through the fourth resistor.
2. A passive output test fixture self-locking circuit according to claim 1, characterized in that: The first pin of the power interface CN2 is grounded.
3. The self-locking circuit of a passive output test fixture according to claim 1, characterized in that: The cathode of the first diode LED1 is connected to the second pin of the external indication interface CN3 and then grounded.