Single-chip GFCI detection control circuit with self-checking function

Abstract

The utility model discloses a single-chip GFCI detection control circuit with a self-checking function. The single-chip GFCI detection control circuit comprises a wiring terminal H1, a mutual inductor HGQ, a rectification power supply circuit U1, a GFCI detection circuit U2, an AC-DC power supply circuit U3, a single-chip GFCI self-checking and control circuit U4, an MCU control circuit U5 and a load circuit U6. The wiring terminal H1 comprises a pin 1 and a pin 2; the rectification power supply circuit U1 is connected with the single-chip GFCI self-checking and control circuit U4; the GFCI detection circuit U2 is connected with the GFCI self-checking and control circuit U4 of the single chip; the GFCI self-checking and control circuit U4 of the single chip is connected with the MCU control circuit U5; the AC-DC power supply circuit U3 is connected with the MCU control circuit U5; the MCU control circuit U5 is connected with the load circuit U6, a self-checking mechanism of the MCU control circuit U5 can regularly check the integrity and the function state of the circuit, it is ensured that leakage current can be reliably detected and responded at the critical moment, and therefore the safety and the reliability of the whole system are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrical safety technical field especially, relate to a single chip GFCI detection control circuit with self -checking function. BACKGROUND

[0002] In the electrical safety field, the leakage protection device (GFCI) is very important, with people's attention to the importance of electrical safety increasing, the performance and reliability of GFCI are also put forward higher requirements, the detection precision of traditional leakage protection circuit is limited, and it is difficult to accurately identify the tiny leakage current, in some scenes of strict leakage current threshold, it can not respond in time, and there is a security risk. On the other hand, the anti-interference ability of traditional circuit is weak, in the complex electromagnetic environment, it is easy to be disturbed and produce malfunction, leading to unnecessary power failure, affecting normal power consumption;

[0003] In the existing circuit system, GFCI detection control circuit often faces false alarm problem, leading to the client using the system to frequently encounter unnecessary alarm, this phenomenon not only reduces the reliability of the system, but also can bring inconvenience and trouble to the user, at the same time, the traditional GFCI lacks effective self-checking function, in the long-term use process, the peripheral components related to the leakage protection function may appear aging, failure and other problems, or the leakage protection function of GFCI itself may also occur failure, but due to the lack of self-checking mechanism, these potential problems are difficult to be found in time, so that the leakage protection device can not work normally at the critical moment, and can not provide reliable security for the user, therefore, a single chip GFCI detection control circuit with self-checking function is proposed. INVENTION CONTENTS

[0004] In order to overcome the above-mentioned defects of the prior art, in order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0005] A single chip GFCI detection control circuit with self-checking function, comprising a terminal H1, a mutual inductor HGQ, a rectifier power supply circuit U1, a GFCI detection circuit U2, an AC-DC power supply circuit U3, a single chip GFCI self-checking and control circuit U4, an MCU control circuit U5 and a load circuit U6.

[0006] Preferably, the terminal H1 comprises a 1 pin and a 2 pin.

[0007] Preferably, the rectifier power supply circuit U1 is connected with the single chip GFCI self-checking and control circuit U4.

[0008] Preferably, the GFCI detection circuit U2 is connected with the single chip GFCI self-checking and control circuit U4.

[0009] Preferably, the single-chip GFCI self-checking and control circuit U4 is connected with the MCU control circuit U5.

[0010] Preferably, the AC-DC power supply circuit U3 is connected with the MCU control circuit U5.

[0011] Preferably, the MCU control circuit U5 is connected with the load circuit U6.

[0012] Preferably, the 1-pin of the terminal H1 is connected with the rectifier power supply circuit U1, the GFCI detection circuit U2, the AC-DC power supply circuit U3 and the load circuit U6 respectively.

[0013] Preferably, the 2-pin of the terminal H1 is connected with the rectifier power supply circuit U1, the GFCI detection circuit U2, the AC-DC power supply circuit U3 and the load circuit U6 respectively.

[0014] Preferably, the 1-pin and the 2-pin of the terminal H1 are connected to the corresponding input ends of the mutual inductor HGQ respectively.

[0015] Preferably, the AC-DC power supply circuit U3 is connected with the GFCI detection circuit U2.

[0016] Preferably, the MCU control circuit U5 is connected with the load circuit U6 through an optical coupling isolation circuit.

[0017] Preferably, the single-chip GFCI self-checking and control circuit U4 outputs signals to the MCU control circuit.

[0018] Preferably, after the MCU control circuit receives an alarm signal, the load circuit is triggered to be disconnected.

[0019] The utility model has the following beneficial effects:

[0020] By integrating the self-checking function, efficient leakage protection can be provided in the system circuit, which is particularly suitable for occasions prone to leakage such as humid environments or outdoor portable devices, and the self-checking mechanism can periodically check the integrity and functional state of the circuit to ensure that the leakage current can be reliably detected and responded to at critical moments, thereby improving the safety and reliability of the entire system.

[0021] The current transformer HGQ monitors the current in the live and neutral wires in real time. Once leakage current is detected, it can be quickly transmitted to the GFCI self-test and control circuit U4 of the single chip through the GFCI detection circuit U2. This causes the MCU control circuit U5 to trigger the load circuit U6 to disconnect, thus cutting off the power supply in time and effectively avoiding the risk of electric shock to users, providing users with accurate and reliable electrical safety protection.

[0022] The current between the live wire L and the neutral wire N is monitored in real time by the current transformer HGQ. When a leakage current is generated (i.e., current difference), the signal is transmitted through the GFCI detection circuit U2 to the single-chip GFCI self-test and control circuit U4. This allows the single-chip GFCI self-test and control circuit U4 to more accurately determine whether it is a real leakage situation based on the received signal, avoiding false alarms caused by similar leakage signals generated by interference. Attached Figure Description

[0023] Figure 1 The circuit diagram is provided for a single-chip GFCI detection and control circuit with self-testing function proposed in this utility model. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example 1

[0025] like Figure 1 As shown, the present invention proposes a single-chip GFCI detection and control circuit with self-testing function, including terminal block H1, current transformer HGQ, rectifier power supply circuit U1, GFCI detection circuit U2, AC-DC power supply circuit U3, single-chip GFCI self-testing and control circuit U4, MCU control circuit U5, and load circuit U6.

[0026] Terminal H1 includes pin 1 and pin 2;

[0027] The rectifier power supply circuit U1 is connected to the single-chip GFCI self-test and control circuit U4;

[0028] The GFCI detection circuit U2 is connected to the single-chip GFCI self-test and control circuit U4;

[0029] The single-chip GFCI self-test and control circuit U4 is connected to the MCU control circuit U5;

[0030] The AC-DC power supply circuit U3 is connected with the MCU control circuit U5.

[0031] The MCU control circuit U5 is connected with the load circuit U6. The pin 1 of the terminal H1 is connected with the rectifier power supply circuit U1, the GFCI detection circuit U2, the AC-DC power supply circuit U3 and the load circuit U6 respectively. The pin 2 of the terminal H1 is connected with the rectifier power supply circuit U1, the GFCI detection circuit U2, the AC-DC power supply circuit U3 and the load circuit U6 respectively. The pin 1 and the pin 2 of the terminal H1 are connected with the corresponding input terminals of the mutual inductor HGQ respectively. The AC-DC power supply circuit U3 is connected with the GFCI detection circuit U2.

[0032] In this embodiment, the AC power is connected through the terminal H1, and then flows into the rectifier power supply circuit. The rectifier power supply circuit is responsible for converting the AC power into stable DC power, providing continuous power supply for the single-chip GFCI self-checking and control circuit U4, and ensuring its normal operation. During the operation of the circuit, the mutual inductor HGQ monitors the current of the fire line L and the zero line N in real time. When there is no difference between the current of the fire line and the zero line, i.e. the circuit is in a normal no-leakage state, the circuit remains stable operation. Once the mutual inductor HGQ detects that there is a difference between the current of the fire line and the zero line, it indicates that there is a leakage current. At this time, the leakage current will pass through the GFCI detection circuit U2 and then be transmitted to the single-chip GFCI self-checking and control circuit U4. After the single-chip GFCI self-checking and control circuit U4 receives the leakage signal, it quickly responds and outputs an action signal to the MCU control circuit. After the MCU control circuit receives the action signal, it immediately triggers the load circuit to disconnect and cuts off the power supply in time, ensuring the safety of electricity use.

[0033] Secondly, the mutual inductor HGQ monitors the current of the fire line L and the zero line N in real time. When there is a leakage current (i.e. the current difference), the signal is transmitted to the single-chip GFCI self-checking and control circuit U4 through the GFCI detection circuit U2. The single-chip GFCI self-checking and control circuit U4 outputs an action signal to the MCU control circuit. The MCU control circuit triggers the load circuit to disconnect. The advanced interference suppression technology ensures the stability of this control signal transmission link, so that the MCU control circuit receives accurate action signals, preventing the MCU control circuit from mistakenly receiving action signals due to interference, thereby avoiding unnecessary misoperation of the load circuit and reducing power outage caused by false alarms. Embodiment 2

[0034] On the basis of embodiment one, MCU control circuit U5 is connected with load circuit U6 through optical coupling isolation circuit, MCU control circuit U5 is connected with load circuit U6 through optical coupling isolation circuit, and the signal output of single-chip GFCI self-checking and control circuit U4 is transmitted to MCU control circuit, after receiving the alarm signal, MCU control circuit triggers load circuit to disconnect.

[0035] In the embodiment, when the failure of peripheral components related to the leakage protection function is detected, or the leakage protection function of the single-chip itself fails, the single-chip will output an alarm signal, which is also transmitted to the MCU control circuit, and after receiving the alarm signal, the MCU control circuit will also trigger the load circuit to disconnect, preventing safety hazards caused by faults, further improving the safety and reliability of the circuit, and the entire circuit design strictly follows the UL943 standard to ensure that the circuit can operate stably and reliably under various working conditions, providing safe and efficient power supply for users.

[0036] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A single chip GFCI detection control circuit with self-checking function, characterized in that, The application relates to a GFCI (Ground Fault Circuit Interrupter) device, which comprises a terminal H1, a mutual inductor HGQ, a rectifier power supply circuit U1, a GFCI detection circuit U2, an AC-DC power supply circuit U3, a single-chip GFCI self-checking and control circuit U4, an MCU control circuit U5 and a load circuit U6. The terminal H1 comprises a 1st pin and a 2nd pin. The rectifier power supply circuit U1 is connected with the single-chip GFCI self-checking and control circuit U4. The GFCI detection circuit U2 is connected with the single-chip GFCI self-checking and control circuit U4. The single-chip GFCI self-checking and control circuit U4 is connected with the MCU control circuit U5. The AC-DC power supply circuit U3 is connected with the MCU control circuit U5. The MCU control circuit U5 is connected with the load circuit U6.

2. The single chip GFCI detection control circuit with self-checking function according to claim 1, characterized in that, The 1st pin of the terminal H1 is connected with the rectifier power supply circuit U1, the GFCI detection circuit U2, the AC-DC power supply circuit U3 and the load circuit U6 respectively.

3. The single chip GFCI detection control circuit with self-checking function according to claim 2, characterized in that, The 2nd pin of the terminal H1 is connected with the rectifier power supply circuit U1, the GFCI detection circuit U2, the AC-DC power supply circuit U3 and the load circuit U6 respectively.

4. The single chip GFCI detection and control circuit with self-checking function according to claim 1, characterized in that, The 1st pin and the 2nd pin of the terminal H1 are respectively connected with corresponding input ends of the mutual inductor HGQ.

5. The single chip GFCI detection and control circuit with self-checking function according to claim 4, characterized in that, The AC-DC power supply circuit U3 is connected with the GFCI detection circuit U2.

6. The single chip GFCI detection and control circuit with self-checking function according to claim 1, characterized in that, The MCU control circuit U5 is connected with the load circuit U6 through an optical coupling isolation circuit.

7. The single chip GFCI detection and control circuit with self-checking function according to claim 1, characterized in that, The single-chip GFCI self-checking and control circuit U4 outputs a signal to the MCU control circuit.

8. The single chip GFCI detection and control circuit with self-checking function according to claim 1, characterized in that, After receiving an alarm signal, the MCU control circuit triggers the load circuit to be disconnected.

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