Relay adhesion test circuit
By designing a relay adhesion test circuit, using a single-chip microcomputer to control the relay's attraction and disconnection, recording the number of attraction times and issuing an alarm, the problem that existing technology cannot judge the relay quality is solved, and the accuracy of quality assessment is achieved.
Patent Information
- Application Number
- CN202422708011.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-07
- Publication Date
- 2025-10-03
- Estimated Expiration
- 2034-11-07
AI Technical Summary
The existing relay adhesion test method cannot record the number of normal closure times of the relay under test, and cannot judge the quality of the relay by comparing the number of normal closure times of each relay under test.
A relay sticking test circuit was designed, which included a main control module, a power supply module, a sticking detection module, a charging and discharging module, a display module, and a buzzer reminder module. The relay was controlled to close and close by a single-chip microcomputer, and the number of closes was recorded. When sticking was detected, an alarm sounded and the normal number of closes was displayed on the screen.
It realizes the real-time detection and recording of relay adhesion. By comparing the normal closing times of relays of different brands, the quality of relays can be judged.
Smart Images
Figure CN223413432U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of relay testing equipment, in particular to a relay adhesion testing circuit. Background Art
[0002] Relays are commonly used components in electronic product design. Sparks are generated on the relay contacts when they are closed. Over time, these contacts can melt and deform, leading to sticking, posing a safety hazard. Currently, relay sticking tests commonly use current and voltage monitoring: by monitoring the current and voltage changes in the relay, if an abnormal, continuous opening and closing state is detected, it can be identified as sticking. However, this method cannot record the number of times the relay under test normally closes, making it impossible to judge relay quality by comparing the number of normal closing times of individual relays. Summary of the Invention
[0003] The utility model aims to solve the above technical problems and provides a relay adhesion test circuit.
[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a relay adhesion test circuit, including a main control module, a power supply module, an adhesion detection module, a charge and discharge module, a display module and a buzzer reminder module, the main control module is respectively connected to the power supply module, the adhesion detection module, the charge and discharge module, the display module and the buzzer reminder module, the adhesion detection module is connected to the charge and discharge module,
[0005] The main control module includes a main control chip U5, a capacitor C5 and a key KEY1. The pin P61 of the main control chip U5 is connected in series with the key KEY1 and then grounded. The pin VDD of the main control chip U5 is connected to +5V and one end of the capacitor C5 respectively. The other end of the capacitor C5 is grounded.
[0006] The power supply module includes capacitors C1 and EC1. The DC5V input terminal is connected in parallel with the capacitors C1 and EC1 and then outputs +5V. The +5V is used to power the main control module, adhesion detection module, charge and discharge module, and display module.
[0007] The adhesion detection module includes a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a capacitor C3, a capacitor C4, an optocoupler U4, a diode D3 and a diode D4. One end of the resistor R9 is connected to the pin P66 of the main control chip U5, and the other end of the resistor R9 is respectively connected to the resistor R7, the resistor R8 and one end of the capacitor C4. The other end of the resistor R8 is connected to +5V. The other end of the capacitor C4 and one end of the capacitor C3 are connected in parallel and then connected to the pin 3 of the optocoupler U4. The other end of the resistor R7 and the other end of the capacitor C3 are connected in parallel and then connected to the pin 4 of the optocoupler U4. The pin 2 of the optocoupler U4 is respectively connected to the positive electrode of the diode D3 and the positive electrode of the diode D4. The pin 1 of the optocoupler U4 is respectively connected to the negative electrode of the diode D3 and one end of the resistor R6. The other end of the resistor R6 is connected in series with the resistor R5 and then connected to one end of the resistor R4.
[0008] The charge and discharge module includes a resistor R1, a resistor R2, a resistor R3, a capacitor C2, a diode D1, a diode D2, a light-emitting diode LED1, a relay to be tested U1, a discharge relay U2, a transistor Q1, a transistor Q2 and a rectifier bridge BG1. The coil of the relay to be tested U1 is connected in parallel with the diode D1, and one end is connected to +5V and the other end is connected to the collector of the transistor Q1. The emitter of the transistor Q1 is grounded. The base of the transistor Q1 is connected in series with the resistor R2 and then connected to the pin P50 of the main control chip U5. One end of the button of the relay to be tested U1 is connected to AC_L, and the other end of the button of the relay to be tested U1 is respectively connected to the cathode of the diode D4 and the pin 3 of the rectifier bridge BG1. Pin 2 of the rectifier bridge BG1 is respectively connected to AC_N and the other end of the resistor R4, pin 4 of the rectifier bridge BG1 is respectively connected to one end of the capacitor C2 and one end of the button of the discharge relay U2, pin 1 of the rectifier bridge BG1 is respectively connected to the other end of the capacitor C2 and one end of the resistor R1, the other end of the resistor R1 is connected in series with the light-emitting diode LED1 and then connected to the other end of the button of the discharge relay U2, the coil of the discharge relay U2 is connected in parallel with the diode D2 and one end is connected to +5V and the other end is connected to the collector of the transistor Q2, the emitter of the transistor Q2 is grounded, and the base of the transistor Q2 is connected in series with the resistor R3 and then connected to the pin P51 of the main control chip U5.
[0009] The display module includes a display screen LCD1, and the display screen LCD1 is connected to the main control chip U5.
[0010] The buzzer reminder module includes a resistor R10, a resistor R11, a transistor Q3 and a buzzer BUZZER1. One end of the resistor R10 is connected to the pin P54 of the main control chip U5, and the other end of the resistor R10 is connected to the base of the transistor Q3. The emitter of the transistor Q3 is grounded, and the collector of the transistor Q3 is connected to the buzzer BUZZER1, the resistor R11 and then to +5V.
[0011] The chip model of the main control chip U5 is JZ8P2615, and the chip model of the optocoupler U4 is UPC817.
[0012] The advantages and positive effects of the utility model are: a relay adhesion test circuit, which controls the relay's closure and closing through single-chip microcomputer programming and records the number of closures. When the single-chip microcomputer detects relay adhesion, it will sound an alarm and display the number of normal closures on the screen. By comparing the number of normal closures of relays of different brands, the quality of the relay can be known. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a principle block diagram of a relay adhesion test circuit;
[0014] Figure 2 This is the circuit connection diagram of the main control module and the display module;
[0015] Figure 3 This is the power module circuit connection diagram;
[0016] Figure 4 This is the circuit connection diagram of the adhesion detection module and the charging and discharging module;
[0017] Figure 5 This is the circuit connection diagram of the buzzer reminder module. DETAILED DESCRIPTION
[0018] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.
[0019] like Figure 1 As shown, a relay adhesion test circuit includes a main control module, a power supply module, an adhesion detection module, a charge and discharge module, a display module and a buzzer reminder module, wherein the main control module is respectively connected to the power supply module, the adhesion detection module, the charge and discharge module, the display module and the buzzer reminder module, and the adhesion detection module is connected to the charge and discharge module.
[0020] like Figure 2As shown, the main control module includes a main control chip U5, a capacitor C5 and a key KEY1. The pin P61 of the main control chip U5 is connected in series with the key KEY1 and then grounded. The pin VDD of the main control chip U5 is connected to +5V and one end of the capacitor C5 respectively, and the other end of the capacitor C5 is grounded. The display module includes a display LCD1, and the display LCD1 is connected to the main control chip U5. Figure 5 As shown, the buzzer reminder module includes resistor R10, resistor R11, transistor Q3, and buzzer BUZZER1. One end of the resistor R10 is connected to pin P54 of the main control chip U5, and the other end of the resistor R10 is connected to the base of the transistor Q3. The emitter of the transistor Q3 is grounded, and the collector of the transistor Q3 is connected to the buzzer BUZZER1, resistor R11, and then to +5V. The main control chip U5 is connected to the display LCD1 via the I2C protocol, and the number of times the relay under test is normally turned on is displayed on the screen. When the relay under test is detected to be stuck, the main control chip U5 controls IO_BEEP to output a 2kHz square wave, and the transistor Q3 drives the buzzer to emit an alarm prompt tone.
[0021] like Figure 3 As shown, the power supply module includes capacitor C1 and capacitor EC1. The DC5V input end is connected in parallel with the capacitor C1 and capacitor EC1 to output +5V, and the +5V is used to power the main control module, adhesion detection module, charging and discharging module and display module.
[0022] like Figure 4As shown, the adhesion detection module includes a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a capacitor C3, a capacitor C4, an optocoupler U4, a diode D3 and a diode D4, one end of the resistor R9 is connected to the pin P66 of the main control chip U5, the other end of the resistor R9 is respectively connected to the resistor R7, the resistor R8 and one end of the capacitor C4, the other end of the resistor R8 is connected to +5V, the other end of the capacitor C4 and one end of the capacitor C3 are connected in parallel to the pin 3 of the optocoupler U4, the other end of the resistor R7 and the other end of the capacitor C3 are connected in parallel to the pin 4 of the optocoupler U4, the pin 2 of the optocoupler U4 is respectively connected to the positive electrode of the diode D3 and the positive electrode of the diode D4, the pin 1 of the optocoupler U4 is respectively connected to the negative electrode of the diode D3 and one end of the resistor R6, and the other end of the resistor R6 is connected in series with the resistor R5 and then connected to one end of the resistor R4. The charge and discharge module includes a resistor R1, a resistor R2, a resistor R3, a capacitor C2, a diode D1, a diode D2, a light-emitting diode LED1, a relay to be tested U1, a discharge relay U2, a transistor Q1, a transistor Q2 and a rectifier bridge BG1. The coil of the relay to be tested U1 is connected in parallel with the diode D1, and one end is connected to +5V and the other end is connected to the collector of the transistor Q1. The emitter of the transistor Q1 is grounded. The base of the transistor Q1 is connected in series with the resistor R2 and then connected to the pin P50 of the main control chip U5. One end of the button of the relay to be tested U1 is connected to AC_L, and the other end of the button of the relay to be tested U1 is respectively connected to the cathode of the diode D4 and the pin 3 of the rectifier bridge BG1. Pin 2 of the rectifier bridge BG1 is connected to AC_N and the other end of the resistor R4, respectively. Pin 4 of the rectifier bridge BG1 is connected to one end of the capacitor C2 and one end of the button of the discharge relay U2, respectively. Pin 1 of the rectifier bridge BG1 is connected to the other end of the capacitor C2 and one end of the resistor R1, respectively. The other end of the resistor R1 is connected in series with the light-emitting diode LED1 and then connected to the other end of the button of the discharge relay U2. The coil of the discharge relay U2 is connected in parallel with the diode D2, and one end is connected to +5V and the other end is connected to the collector of the transistor Q2. The emitter of the transistor Q2 is grounded, and the base of the transistor Q2 is connected in series with the resistor R3 and then connected to pin P51 of the main control chip U5. When there is a 220VAC voltage input at the input end of the optocoupler U4, IO_TEST will output a 50HZ square wave. When there is no voltage input at the input end of the optocoupler U4, IO_TEST outputs a 5V high-level signal. When the main control chip U5 controls IO_RELAY1 to a low level, if IO_TEST outputs a 50HZ square wave, it is considered that the relay U1 to be tested is stuck.When the main control chip U5 controls IO_RELAY1 to a high level, transistor Q1 conducts, and relay U1 under test closes. The current is rectified by rectifier bridge BG1 into a DC current to charge electrolytic capacitor C2. When the main control chip U5 controls IO_RELAY1 to a low level, charging of electrolytic capacitor C2 stops. When the main control chip U5 controls IO_RELAY2 to a high level, transistor Q2 conducts, and discharge relay U2 closes. The voltage in electrolytic capacitor C2 flows through resistor R1, illuminating indicator LED1, thereby dissipating the charge in electrolytic capacitor C2.
[0023] The chip model of the main control chip U5 is JZ8P2615, and the chip model of the optocoupler U4 is UPC817.
[0024] The working process of a relay adhesion test circuit is as follows: Press the button KEY1, and the main control chip U5 will start the entire test program:
[0025] A: The main control chip U5 controls the transistor Q1 to turn on, and the relay U1 to be tested is attracted to charge the electrolytic capacitor C2.
[0026] B: After the relay U1 is energized for 5 seconds, disconnect the relay U1 and then test the IO_TEST signal. If the IO_TES signal is a continuous high-level signal, the relay is not stuck. If the IO_TEST signal is a 50HZ pulse signal, it means the relay is stuck, and the buzzer alarm prompts, and the program does not proceed to the C condition.
[0027] C: After the relay U1 to be tested is disconnected, the main control chip U5 controls the transistor Q2 to conduct, and the discharge relay U2 is attracted to discharge the electrolytic capacitor C2 for 10 seconds. After 10 seconds, the discharge relay U2 is disconnected.
[0028] D: Accumulate the number of times the relay U1 is closed and display the number of times on LCD1. Then return to condition A for loop test.
[0029] A relay sticking test circuit controls the closing and closing of the relay through single-chip microcomputer programming, and records the number of closings. When the single-chip microcomputer detects relay sticking, it will sound an alarm and display the number of normal closings on the screen. By comparing the number of normal closings of relays of different brands, the quality of the relay can be determined.
[0030] The above embodiments of the present invention are described in detail. However, the above contents are only preferred embodiments of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of this patent.
Claims
1. A relay adhesion test circuit, characterized in that: It includes a main control module, a power supply module, an adhesion detection module, a charge and discharge module, a display module and a buzzer reminder module. The main control module is connected to the power supply module, the adhesion detection module, the charge and discharge module, the display module and the buzzer reminder module respectively. The adhesion detection module is connected to the charge and discharge module. The main control module includes a main control chip U5, a capacitor C5 and a key KEY1. The pin P61 of the main control chip U5 is connected in series with the key KEY1 and then grounded. The pin VDD of the main control chip U5 is connected to +5V and one end of the capacitor C5 respectively. The other end of the capacitor C5 is grounded. The power supply module includes capacitors C1 and EC1. The DC5V input terminal is connected in parallel with the capacitors C1 and EC1 and then outputs +5V. The +5V is used to power the main control module, adhesion detection module, charge and discharge module, and display module. The adhesion detection module includes a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a capacitor C3, a capacitor C4, an optocoupler U4, a diode D3 and a diode D4. One end of the resistor R9 is connected to the pin P66 of the main control chip U5, and the other end of the resistor R9 is respectively connected to the resistor R7, the resistor R8 and one end of the capacitor C4. The other end of the resistor R8 is connected to +5V. The other end of the capacitor C4 and one end of the capacitor C3 are connected in parallel and then connected to the pin 3 of the optocoupler U4. The other end of the resistor R7 and the other end of the capacitor C3 are connected in parallel and then connected to the pin 4 of the optocoupler U4. The pin 2 of the optocoupler U4 is respectively connected to the positive electrode of the diode D3 and the positive electrode of the diode D4. The pin 1 of the optocoupler U4 is respectively connected to the negative electrode of the diode D3 and one end of the resistor R6. The other end of the resistor R6 is connected in series with the resistor R5 and then connected to one end of the resistor R4. The charge and discharge module includes a resistor R1, a resistor R2, a resistor R3, a capacitor C2, a diode D1, a diode D2, a light-emitting diode LED1, a relay to be tested U1, a discharge relay U2, a transistor Q1, a transistor Q2 and a rectifier bridge BG1. The coil of the relay to be tested U1 is connected in parallel with the diode D1, and one end is connected to +5V and the other end is connected to the collector of the transistor Q1. The emitter of the transistor Q1 is grounded. The base of the transistor Q1 is connected in series with the resistor R2 and then connected to the pin P50 of the main control chip U5. One end of the button of the relay to be tested U1 is connected to AC_L, and the other end of the button of the relay to be tested U1 is respectively connected to the cathode of the diode D4 and the pin 3 of the rectifier bridge BG1. Pin 2 of the rectifier bridge BG1 is respectively connected to AC_N and the other end of the resistor R4, pin 4 of the rectifier bridge BG1 is respectively connected to one end of the capacitor C2 and one end of the button of the discharge relay U2, pin 1 of the rectifier bridge BG1 is respectively connected to the other end of the capacitor C2 and one end of the resistor R1, the other end of the resistor R1 is connected in series with the light-emitting diode LED1 and then connected to the other end of the button of the discharge relay U2, the coil of the discharge relay U2 is connected in parallel with the diode D2 and one end is connected to +5V and the other end is connected to the collector of the transistor Q2, the emitter of the transistor Q2 is grounded, and the base of the transistor Q2 is connected in series with the resistor R3 and then connected to the pin P51 of the main control chip U5. The display module includes a display screen LCD1, and the display screen LCD1 is connected to the main control chip U5. The buzzer reminder module includes a resistor R10, a resistor R11, a transistor Q3 and a buzzer BUZZER1. One end of the resistor R10 is connected to the pin P54 of the main control chip U5, and the other end of the resistor R10 is connected to the base of the transistor Q3. The emitter of the transistor Q3 is grounded, and the collector of the transistor Q3 is connected to the buzzer BUZZER1, the resistor R11 and then to +5V.
2. A relay adhesion test circuit according to claim 1, characterized in that: The chip model of the main control chip U5 is JZ8P2615, and the chip model of the optocoupler U4 is UPC817.