CN216434291U - Circuit board output voltage ripple detection circuit - Google Patents
Circuit board output voltage ripple detection circuit Download PDFInfo
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- CN216434291U CN216434291U CN202123077649.8U CN202123077649U CN216434291U CN 216434291 U CN216434291 U CN 216434291U CN 202123077649 U CN202123077649 U CN 202123077649U CN 216434291 U CN216434291 U CN 216434291U
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- comparator
- output voltage
- voltage ripple
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Abstract
The utility model relates to a circuit board testing technique, it discloses a simple structure, with low costs circuit board output voltage ripple detection circuitry, but whether short-term test circuit board output voltage ripple is qualified, improves the security and the reliability of circuit board. The circuit includes: the circuit comprises a capacitor, an operational amplifier, a DAC, a first comparator and a second comparator; the input end of the operational amplifier is connected to a voltage test point of the circuit board through a capacitor, and the output end of the operational amplifier is connected with the input ends of the first comparator and the second comparator; and the first output end and the second output end of the DAC are respectively connected with the input ends of the first comparator and the second comparator and are used for setting the peak value reference value and the valley value reference value of the output voltage ripple of the circuit board.
Description
Technical Field
The utility model relates to a circuit board testing technique, concretely relates to circuit board output voltage ripple detection circuit.
Background
For equipment comprising a circuit board, the circuit board needs to work reliably and stably, and meanwhile ripples of the circuit board are required to be within a normal range. Due to the structure and circuit characteristics of the circuit board, voltage ripple abnormity caused by the abnormality of insufficient soldering of some components and parts can be generated during large-scale production, and a detection circuit needs to be added to ensure that the circuit board with abnormal sieving can be sieved out.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the circuit board output voltage ripple detection circuit is simple in structure and low in cost, whether circuit board output voltage ripples are qualified or not can be detected quickly, and safety and reliability of a circuit board are improved.
The utility model provides a technical scheme that above-mentioned technical problem adopted is:
a circuit board output voltage ripple detection circuit, comprising: the circuit comprises a capacitor, an operational amplifier, a DAC, a first comparator and a second comparator; the input end of the operational amplifier is connected to a voltage test point of the circuit board through a capacitor, and the output end of the operational amplifier is connected with the input ends of the first comparator and the second comparator; and the first output end and the second output end of the DAC are respectively connected with the input ends of the first comparator and the second comparator and are used for setting the peak value reference value and the valley value reference value of the output voltage ripple of the circuit board.
As further optimization, the circuit further comprises a first alarm module and a second alarm module, wherein the output ends of the first comparator and the second comparator are respectively connected with the first alarm module and the second alarm module.
As a further optimization, the first alarm module and the second alarm module comprise a buzzer and/or an indicator light.
As a further optimization, the detection circuit is arranged on the detection tool.
The utility model has the advantages that:
based on the circuit design, whether the output voltage ripple of the circuit board is normal can be detected by using less hardware, the cost is low, the structure is simple, and the original electrical parameters are not influenced; when concrete application, can set up above-mentioned circuit on detecting the frock, when each way voltage of circuit board output needs the test ripple wave time, only need to connect voltage ripple test point on testing the frock, just can short-term test out the ripple whether in qualified scope, avoid unusual circuit board to flow into next process, improve the reliability and the security of circuit board greatly.
Drawings
Fig. 1 is the utility model provides a circuit board output voltage ripple detection circuit structure chart.
Detailed Description
The utility model aims at providing a simple structure, with low costs circuit board output voltage ripple detection circuitry, but whether short-term test circuit board output voltage ripple is qualified, improve the security and the reliability of circuit board.
In concrete implementation, as shown in fig. 1, the utility model provides a circuit board output voltage ripple detection circuit includes: the circuit comprises a capacitor U1, an operational amplifier, a DAC, a first comparator and a second comparator; the input end of the operational amplifier is connected to a voltage test point of the circuit board through a capacitor, and the output end of the operational amplifier is connected with the input ends of the first comparator and the second comparator; and the first output end and the second output end of the DAC are respectively connected with the input ends of the first comparator and the second comparator and are used for setting the peak value reference value and the valley value reference value of the output voltage ripple of the circuit board.
Based on the circuit design, the capacitor U1 plays an isolation role, the voltage output by a voltage test point on the circuit board passes through the capacitor U1, only alternating current (ripple part) is coupled to the operational amplifier, and the operational amplifier amplifies the ripple of a smaller voltage signal and inputs the amplified ripple to the two comparators; the peak value reference value MAX and the valley value reference value MIN of the output voltage ripple of the circuit board can be preset through a DAC, and the two values are the maximum limit value and the minimum limit value which are actually required by the output voltage ripple and are multiplied by the corresponding amplification factor;
outputting the two reference values to two comparators respectively as a basis for comparison; the compared output result is the ripple amplitude whether the actual voltage ripple amplitude of the voltage test point on the circuit board meets the requirement or not, and then whether the ripple exceeds the standard or not is judged, so that the abnormal circuit board is screened out.
In order to visually know whether the voltage ripple of the circuit board is abnormal or not, a first alarm module and a second alarm module can be arranged on the basis of the circuit, for example, the output ends of the two comparators are respectively connected with a buzzer or an indicator light, and when the buzzer alarms or the indicator light lights up a red light, the voltage ripple of the circuit board exceeds the standard, and the circuit board is abnormal.
As the optimization means, can be with above-mentioned circuit setting on test fixture, when each way voltage of circuit board output needs the test ripple, only need to connect the voltage ripple test point on test fixture, through this detection frock, just can detect out fast whether the ripple is in qualified scope, improve the reliability and the security of circuit board greatly, do not influence original electrical parameter simultaneously.
Claims (4)
1. A circuit board output voltage ripple detection circuit is characterized in that,
the method comprises the following steps: the circuit comprises a capacitor, an operational amplifier, a DAC, a first comparator and a second comparator; the input end of the operational amplifier is connected to a voltage test point of the circuit board through a capacitor, and the output end of the operational amplifier is connected with the input ends of the first comparator and the second comparator; and the first output end and the second output end of the DAC are respectively connected with the input ends of the first comparator and the second comparator and are used for setting the peak value reference value and the valley value reference value of the output voltage ripple of the circuit board.
2. The circuit board output voltage ripple detection circuit of claim 1,
the circuit further comprises a first alarm module and a second alarm module, wherein the output ends of the first comparator and the second comparator are respectively connected with the first alarm module and the second alarm module.
3. The circuit board output voltage ripple detection circuit of claim 2,
the first alarm module and the second alarm module comprise buzzers and/or indicator lamps.
4. The circuit board output voltage ripple detection circuit of any one of claims 1 to 3,
the detection circuit is arranged on the detection tool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123077649.8U CN216434291U (en) | 2021-12-09 | 2021-12-09 | Circuit board output voltage ripple detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123077649.8U CN216434291U (en) | 2021-12-09 | 2021-12-09 | Circuit board output voltage ripple detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216434291U true CN216434291U (en) | 2022-05-03 |
Family
ID=81343437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123077649.8U Active CN216434291U (en) | 2021-12-09 | 2021-12-09 | Circuit board output voltage ripple detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216434291U (en) |
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2021
- 2021-12-09 CN CN202123077649.8U patent/CN216434291U/en active Active
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