CN211928111U - Detection system for relay coil transient suppression diode - Google Patents
Detection system for relay coil transient suppression diode Download PDFInfo
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- CN211928111U CN211928111U CN201922163329.0U CN201922163329U CN211928111U CN 211928111 U CN211928111 U CN 211928111U CN 201922163329 U CN201922163329 U CN 201922163329U CN 211928111 U CN211928111 U CN 211928111U
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Abstract
The utility model belongs to relay test field, the relay to traditional helicopter electrical system has the problem whether normally connects of the parallelly connected transient suppression diode of unable detection relay coil, the utility model provides an automatic detecting system of helicopter relay coil transient suppression diode. The method comprises the following steps: the system comprises a human-computer operation interface, a CPU, printing equipment, a detection circuit, a power supply conversion module, a power supply switching module and a transfer cable. The method can detect the correct, open, reverse and short-circuit working states of the relay coil parallel transient suppression diode and display the detection result.
Description
Technical Field
The utility model belongs to relay test field, especially a detection system of transient suppression diode.
Background
An electromagnetic relay generally comprises an iron core, a coil, an armature, a contact spring and the like. A certain voltage is applied to two ends of the coil, a certain current flows in the coil, so that an electromagnetic effect is generated, the armature iron overcomes the pulling force of the return spring and is attracted to the iron core under the attraction effect of the electromagnetic force, and the movable contact and the fixed contact of the armature iron are driven to be attracted. Because the electromagnetic relay coil has inductance characteristic, when the electromagnetic relay coil is powered off, the energy stored in the inductance coil can generate a reverse electromotive force to prevent the reduction of current due to self-inductance effect, which is essentially an energy release process, and if the inductance coil is opened, the induced electromotive force generated at two ends of the inductance coil is several times of the power voltage, and other equipment can be punctured. Therefore, it is necessary to connect transient suppression diodes in parallel at two ends of the electromagnetic relay coil to prevent the reverse electromotive force from breaking down other electronic devices when the electromagnetic relay coil is powered off. Therefore, it is important to determine whether the transient suppression diode is normally connected in parallel across the coil of the electromagnetic relay.
SUMMERY OF THE UTILITY MODEL
The relay to traditional helicopter electrical system exists the problem whether normally connects of the parallelly connected transient suppression diode of unable detection relay coil, the utility model provides an automatic detecting system of helicopter relay coil transient suppression diode. The method can detect the correct, open, reverse and short-circuit working states of the relay coil parallel transient suppression diode and display the detection result.
The technical scheme for solving the technical problem is as follows:
a detection system for a helicopter relay coil transient suppression diode, comprising: the power supply switching device comprises a CPU, a detection module, a power supply switching module and a transfer cable; the detection module is connected with a transient suppression diode of a relay coil to be detected through a transfer cable and is connected with the CPU through a parallel interface; the power conversion module converts an external power supply into a power supply matched with the detection module, and supplies power to the detection module and the CPU through the power switching module.
The utility model discloses technical scheme's characteristics and further improvement:
1. the detection module comprises a first detection circuit and a second detection circuit;
the first detection circuit is used for determining whether the state of the diode is reverse connection or short circuit;
the second detection circuit is used for determining whether the state of the diode is connected or disconnected.
2. The first detection circuit comprises a switch and a resistor, one end of the switch is connected with the positive electrode of a power supply, the other end of the switch is connected with one end of the resistor, the other end of the resistor is connected with the positive electrode of the relay to be detected, and the negative electrode of the relay to be detected is connected with the negative electrode of the power supply; the relay to be tested is connected with the first detection circuit in series.
3. The transient suppression diode of the relay coil to be detected is connected with the relay coil in parallel, and the second detection circuit comprises a switch, a diode Dx and a resistor R; one end of the switch is connected with the positive electrode of the power supply, the other end of the switch is connected with the cathode of the diode Dx, the anode of the diode Dx is connected with one end of the resistor, the other end of the resistor is connected with the negative electrode of the power supply, the positive electrode of the relay to be tested is connected with the cathode of the diode Dx, the negative electrode of the relay to be tested is connected with the negative electrode of the power supply, and the relay to be tested is connected with the.
4. The first detection circuit measures the voltage at two ends of the transient suppression diode D; and determining that the voltage at two ends of the transient suppression diode D is 0.7V, and determining that the transient suppression diode is reversely connected.
5. The first detection circuit measures the voltage at two ends of the transient suppression diode D; and if the voltage at the two ends of the transient suppression diode D is measured to be 0V, determining that the transient suppression diode is short-circuited or broken down.
6. The second detection circuit measures the voltage at two ends of the resistor R, and measures that the voltage U at two ends of the resistor R is 0V; it is determined that the transient suppression diode is forward connected.
7. The second detection circuit measures the voltage at two ends of the resistor R, and the voltage U-I R on the resistor R is measured, so that the open circuit or non-connection of the transient suppression diode is determined.
The detection method can detect the four states of the relay coil transient suppression diode, such as correct state, open circuit state, short circuit state and reverse connection state, is simple, convenient and quick in detection process, and can easily locate fault points of a product with problems.
Drawings
FIG. 1 is a system composition diagram;
FIG. 2 is a schematic diagram of the detection circuit 1 with the detection diodes connected in reverse;
FIG. 3 is a schematic diagram of the detection circuit 1 for detecting diode breakdown;
FIG. 4 is a schematic diagram of the detection circuit 1 for detecting whether the diode is open or not;
FIG. 5 is a schematic diagram of the detection circuit 1 showing the detection diode in normal operation;
FIG. 6 is a schematic diagram of the detection circuit 2 for detecting whether the diode is open or not;
fig. 7 is a schematic diagram of the detection circuit 2 for detecting the diode normal.
Detailed Description
A detection system for a helicopter relay coil transient suppression diode, as shown in fig. 1, comprising: the system comprises a human-computer operation interface, a CPU, printing equipment, a detection module, a power supply conversion module, a power supply switching module and a transfer cable; the detection module is connected with a transient suppression diode of a relay coil to be detected through a transfer cable, the detection module is connected with the CPU through a parallel interface, and meanwhile, the CPU is respectively connected with the printer and the human-computer operation interface; the power supply conversion module converts an external power supply into required voltage, and supplies power to the detection module, the CPU and the human-computer operation interface through the power supply switching module.
STM32F407 of ST company is selected as a core processor of the CPU board, and the CPU board is mainly used for receiving an instruction of an operator, controlling a detection module, collecting data, sending a detection result to a human-computer interaction interface and the like.
Equipment power input: the AC220V/50Hz power supply is input from the outside, and is converted into a DC 18V-30V continuously adjustable power supply to the power selection switching unit through the AC/DC power supply for the user to select. Or the power supply is externally input to the power supply selection switching unit from the DC27V (input range: 18V-30V) power supply for the user to select.
And printing the detection result by using a small RS232 serial port stylus printer.
Step one
According to the detection circuit 1 in the test equipment shown in the attached figures 2, 3, 4 and 5, whether the coil of the relay to be tested is normally connected with the transient suppression diode is detected.
1. When the direction of the diode is reversed, as shown in fig. 2, the diode D is turned on after S is closed, the voltage across D is clamped at about 0.7V, and the voltage of U is equal to the voltage across D (about 0.7V); therefore, the voltage of U is measured, and when the voltage of U is approximately equal to 0V, the diode is judged to be reversely connected in the striking direction;
2. when the diode breaks down or is short-circuited, as shown in fig. 3, the diode is equivalent to a wire when S is closed, and the U voltage is 0V. Therefore, the U voltage is measured, and when the U voltage is approximately equal to 0V, the breakdown or short circuit of the diode can be judged;
3. when the diode is open-circuited or not connected, as shown in fig. 4, after the S switch is closed, the coil of the relay is powered on, and the voltage across the voltage-dividing resistor is Ur, at this time, U is Vi-Ur.
4. When the diode or the diode is normally connected, as shown in fig. 5, after the S switch is closed, the transient suppression diode is turned off in the reverse direction, the coil of the relay is powered on, the voltage across the voltage-dividing resistor is Ur, and at this time, U is Vi-Ur.
5. At this time, it cannot be determined whether the diode is open or not or whether the diode is normally connected, and therefore the process proceeds to step two to perform further determination.
Step two
The detection circuit 2 in the test equipment according to fig. 6 and fig. 7 detects the state of whether the coil of the relay to be tested is normally connected with the transient suppression diode.
1. When the diode is open or not connected, as shown in fig. 6, the detection diode Dx, the cathode R and the relay coil form a loop to generate a freewheeling i, and the current flows through R, Dx, which generates a voltage drop across R: u ═ i × R.
The voltage of U is measured to judge whether the diode is broken or not.
2. When the diode is normally connected, as shown in fig. 7, S is opened after S is closed, the relay coil and the diode D form a loop to generate a follow current i, no current flows through the resistor R, and the voltage across R is approximately equal to 0V.
From this, it can be determined that the diode is normally connected.
The technical effects are as follows:
the detection method can detect the four states of the relay coil transient suppression diode, such as correct state, open circuit state, short circuit state and reverse connection state, is simple, convenient and quick in detection process, and can easily locate fault points of a product with problems.
During specific implementation, a relay to be tested is connected to a detection device of a relay coil transient suppression diode through a transfer cable, testers and password options on a liquid crystal touch screen are selected to log in, the type of the relay to be detected is selected, a voltage adjusting knob on an automatic detection device is adjusted to a required voltage value, communication detection is clicked, and after the upper computer displays that communication is normal, the detection is started by clicking. The automatic detection equipment tests the transient suppression diode of the relay coil and sends a test result to an upper computer, and finally, the detection process and the detection result are displayed on a liquid crystal touch screen of the upper computer in a text description mode. The purpose of automatically detecting whether the transient suppression diode of the relay coil is correctly connected is achieved.
Claims (8)
1. A detection system for a relay coil transient suppression diode, comprising: the power supply switching device comprises a CPU, a detection module, a power supply switching module and a transfer cable; the detection module is connected with a transient suppression diode of a relay coil to be detected through a transfer cable and is connected with the CPU through a parallel interface; the power conversion module converts an external power supply into a power supply matched with the detection module, and supplies power to the detection module and the CPU through the power switching module.
2. A detection system for a relay coil transient suppression diode as recited in claim 1, wherein: the detection module comprises a first detection circuit and a second detection circuit;
the first detection circuit is used for determining whether the state of the diode is reverse connection or short circuit;
the second detection circuit is used for determining whether the state of the diode is connected or disconnected.
3. A detection system for a relay coil transient suppression diode as recited in claim 2, the relay coil transient suppression diode under test being connected in parallel with the relay coil, wherein: the first detection circuit comprises a switch and a resistor, one end of the switch is connected with the positive electrode of the power supply, the other end of the switch is connected with one end of the resistor, the other end of the resistor is connected with the positive electrode of the relay to be detected, and the negative electrode of the relay to be detected is connected with the negative electrode of the power supply; the relay to be tested is connected with the first detection circuit in series.
4. A detection system for a relay coil transient suppression diode as recited in claim 2, the relay coil transient suppression diode under test being connected in parallel with the relay coil, wherein: the second detection circuit comprises a switch, a diode Dx and a resistor R; one end of the switch is connected with the positive electrode of the power supply, the other end of the switch is connected with the cathode of the diode Dx, the anode of the diode Dx is connected with one end of the resistor, the other end of the resistor is connected with the negative electrode of the power supply, the positive electrode of the relay to be tested is connected with the cathode of the diode Dx, the negative electrode of the relay to be tested is connected with the negative electrode of the power supply, and the relay to be tested is connected with the.
5. A detection system for a relay coil transient suppression diode as recited in claim 3, wherein: the first detection circuit measures the voltage at two ends of the transient suppression diode D; and determining that the voltage at the two ends of the transient suppression diode D is 0.7V, and determining that the transient suppression diode is reversely connected.
6. A detection system for a relay coil transient suppression diode as recited in claim 3, wherein: the first detection circuit measures the voltage at two ends of the transient suppression diode D; and if the voltage of the two ends of the transient suppression diode D is measured to be 0V, determining that the transient suppression diode is short-circuited or broken down.
7. The detection system for the relay coil transient suppression diode of claim 4, wherein: the second detection circuit measures the voltage at two ends of the resistor R, and measures that the voltage U at two ends of the resistor R is 0V; it is determined that the transient suppression diode is forward connected.
8. The detection system for the relay coil transient suppression diode of claim 4, wherein: the second detection circuit measures the voltage at two ends of the resistor R, and the voltage U-I R on the resistor R is measured, so that the open circuit or non-connection of the transient suppression diode is determined.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922163329.0U CN211928111U (en) | 2019-12-05 | 2019-12-05 | Detection system for relay coil transient suppression diode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922163329.0U CN211928111U (en) | 2019-12-05 | 2019-12-05 | Detection system for relay coil transient suppression diode |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933694A (en) * | 2021-10-09 | 2022-01-14 | 中国南方电网有限责任公司超高压输电公司昆明局 | Method and device for detecting running state of optical coupling relay |
| CN114487791A (en) * | 2022-04-06 | 2022-05-13 | 杭州米芯微电子有限公司 | SOC chip test system and test method |
-
2019
- 2019-12-05 CN CN201922163329.0U patent/CN211928111U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933694A (en) * | 2021-10-09 | 2022-01-14 | 中国南方电网有限责任公司超高压输电公司昆明局 | Method and device for detecting running state of optical coupling relay |
| CN114487791A (en) * | 2022-04-06 | 2022-05-13 | 杭州米芯微电子有限公司 | SOC chip test system and test method |
| CN114487791B (en) * | 2022-04-06 | 2022-09-06 | 杭州米芯微电子有限公司 | SOC chip test system and test method |
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