CN220139224U - Leakage protection circuit with noise filtering function - Google Patents
Leakage protection circuit with noise filtering function Download PDFInfo
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- CN220139224U CN220139224U CN202320350690.8U CN202320350690U CN220139224U CN 220139224 U CN220139224 U CN 220139224U CN 202320350690 U CN202320350690 U CN 202320350690U CN 220139224 U CN220139224 U CN 220139224U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
Description
技术领域Technical field
本实用新型涉及一电源保护电路，尤其是一种带噪音过滤的漏电保护电路。The utility model relates to a power supply protection circuit, in particular to a leakage protection circuit with noise filtering.
背景技术Background technique
为了保证用电设备的用电安全，通常都需要设置漏电监测及保护电路。一旦用电设备出现漏电时，可通过漏电监测保护电路即时切断供电电源，以防止用户可能出现的电击危险。同时，由于不同的用电设备在工作时会产生一些高频信号等，如高频开关电源等，这些高频信号会通过电源线反馈会电源线路，可能会对其他用电设备产生干扰等，为此需要在用电设备的电源输入端设置噪音过滤电路。现有的电路设计通常会将噪音过滤电路设置于漏电保护电路的后端，由于噪音过滤电路中通常会设置电容或电感等原件，而这些原件会过滤或延迟电源线因漏电所产生的差动信号，也有可能因噪音过滤电路中产生充放电等动作而误产生差动信号，从而影响漏电保护电路的工作灵敏度、反应时间或误触发。In order to ensure the safety of electrical equipment, it is usually necessary to set up leakage monitoring and protection circuits. Once electrical equipment leaks, the power supply can be cut off immediately through the leakage monitoring protection circuit to prevent users from possible electric shock hazards. At the same time, because different electrical equipment will generate some high-frequency signals when working, such as high-frequency switching power supplies, etc., these high-frequency signals will be fed back to the power lines through the power lines, which may cause interference to other electrical equipment. For this purpose, a noise filter circuit needs to be installed at the power input end of the electrical equipment. Existing circuit designs usually place the noise filter circuit at the back end of the leakage protection circuit. Since the noise filter circuit usually contains components such as capacitors or inductors, these components will filter or delay the differential movement caused by leakage on the power line. signal, or a differential signal may be mistakenly generated due to charging and discharging in the noise filter circuit, thereby affecting the working sensitivity, response time or false triggering of the leakage protection circuit.
实用新型内容Utility model content
本实用新型的目在于提供一种带噪音过滤的漏电保护电路，通过调整噪音过滤电路及漏电保护电路的设置，从而提高整个电路的可靠性。The purpose of this utility model is to provide a leakage protection circuit with noise filtering, which can improve the reliability of the entire circuit by adjusting the settings of the noise filtering circuit and the leakage protection circuit.
本实用新型是通过以下技术方案实现的：The utility model is realized through the following technical solutions:
带噪音过滤的漏电保护电路，包括漏电保护电路，所述漏电保护电路的输入端串接噪音过滤电路后再与电源连接，所述漏电保护电路的输出端与用电设备连接。The leakage protection circuit with noise filtering includes a leakage protection circuit. The input terminal of the leakage protection circuit is connected in series with the noise filter circuit and then connected to the power supply. The output terminal of the leakage protection circuit is connected to the electrical equipment.
优选地，所述漏电保护电路包括互感采样电路、漏电监测芯片及其外围电路；所述互感采样电路为电流互感器及滤波电路，所述噪音过滤电路的输出端的供电线路并列穿过电流互感器，电流互感器的线圈输出端连接滤波电路后连接至漏电监测芯片的差动信号输入端；噪音过滤电路的输出端的供电线路还串接继电器后再输出至用电设备，继电器的吸合线圈连接至漏电监测芯片的控制输出端。Preferably, the leakage protection circuit includes a mutual inductance sampling circuit, a leakage monitoring chip and its peripheral circuit; the mutual inductance sampling circuit is a current transformer and a filter circuit, and the power supply line at the output end of the noise filter circuit passes through the current transformer in parallel , the coil output end of the current transformer is connected to the filter circuit and then connected to the differential signal input end of the leakage monitoring chip; the power supply line at the output end of the noise filter circuit is also connected in series with a relay and then output to the electrical equipment, and the pull-in coil of the relay is connected to the control output of the leakage monitoring chip.
优选地，所述噪音过滤电路包括两组，每组噪音过滤电路包括串接在电源输入端的两组串联电阻及一电容组成。Preferably, the noise filtering circuit includes two groups, and each group of noise filtering circuit includes two groups of series resistors and a capacitor connected in series at the power input end.
优选地，所述漏电监测芯片的型号为NC37020。Preferably, the model of the leakage monitoring chip is NC37020.
与现有技术相比，本实用新型的有益效果为：如用电设备出现漏电时，会在电源线中产生的差动信号并直接被漏电保护电路监测到，从而能够及时作出切断电源的动作，不受噪音过滤电路工作的影响，可避免产生误动作，也可提高漏电保护电路的反应时间。Compared with the existing technology, the beneficial effects of this utility model are: when electrical equipment leaks, the differential signal generated in the power line is directly monitored by the leakage protection circuit, so that the action of cutting off the power supply can be made in time. , is not affected by the work of the noise filter circuit, can avoid malfunctions, and can also improve the response time of the leakage protection circuit.
附图说明Description of drawings
为了更清楚地说明本实用新型实施例中的技术方案，下面结合附图对实施例中的技术进行详细描述。In order to explain the technical solutions in the embodiments of the present invention more clearly, the technologies in the embodiments are described in detail below with reference to the accompanying drawings.
图1是本实用新型的第一种使用状态的电路原理图。Figure 1 is a circuit schematic diagram of the first usage state of the present invention.
实施方式Implementation
参考图1，带噪音过滤的漏电保护电路，包括漏电保护电路，所述漏电保护电路的输入端串接噪音过滤电路后再与电源连接，所述漏电保护电路的输出端与用电设备连接。如用电设备出现漏电时，会在电源线中产生的差动信号并直接被漏电保护电路监测到，从而能够及时作出切断电源的动作，不受噪音过滤电路工作的影响，可避免产生误动作，也可提高漏电保护电路的反应时间。Referring to Figure 1, a leakage protection circuit with noise filtering includes a leakage protection circuit. The input terminal of the leakage protection circuit is connected in series with the noise filter circuit and then connected to the power supply. The output terminal of the leakage protection circuit is connected to the electrical equipment. If electrical equipment leaks, a differential signal will be generated in the power line and directly monitored by the leakage protection circuit, so that the power can be cut off in a timely manner without being affected by the work of the noise filter circuit, thus avoiding malfunctions. , and can also improve the response time of the leakage protection circuit.
其中，漏电保护电路包括互感采样电路、漏电监测芯片及其外围电路。外围电路包括供电电路，输出驱动电路、状态显示电路等等。其中供电电路连接至电源，通过整流桥及滤波电路等产生相应的直流电为漏电监测芯片等供电。由于继电器的线圈工作时需要较大的工作电流，漏电检测芯片的输出端未能提供足够的驱动电流，因此需要加入输出驱动电路，包括可控硅及外围电路，继电器的线圈连接至输出驱动电路。还有状态显示电路等，当出现漏电或异常时，漏电监测芯片的相应端口输出信号驱动LED发光，用以告知用户及时处理。互感采样电路为电流互感器及滤波电路。噪音过滤电路的输出端的供电线路并列穿过电流互感器，电流互感器的线圈输出端连接滤波电路后连接至漏电监测芯片的差动信号输入端；噪音过滤电路的输出端的供电线路还串接继电器后再输出至用电设备，继电器的吸合线圈连接至漏电监测芯片的控制输出端。漏电监测芯片采用型号为NC37020的专用集成电路。Among them, the leakage protection circuit includes a mutual inductance sampling circuit, a leakage monitoring chip and its peripheral circuits. Peripheral circuits include power supply circuits, output drive circuits, status display circuits, etc. The power supply circuit is connected to the power supply, and the corresponding direct current is generated through the rectifier bridge and filter circuit to power the leakage monitoring chip and so on. Since the coil of the relay requires a large operating current, the output end of the leakage detection chip cannot provide sufficient driving current. Therefore, an output driving circuit needs to be added, including a thyristor and peripheral circuits. The coil of the relay is connected to the output driving circuit. . There are also status display circuits, etc. When leakage or abnormality occurs, the corresponding port output signal of the leakage monitoring chip drives the LED to light up to inform the user to handle it in time. The mutual inductance sampling circuit is a current transformer and filter circuit. The power supply line at the output end of the noise filter circuit passes through the current transformer in parallel. The coil output end of the current transformer is connected to the filter circuit and then to the differential signal input end of the leakage monitoring chip; the power supply line at the output end of the noise filter circuit is also connected in series with a relay. Then it is output to the electrical equipment, and the pickup coil of the relay is connected to the control output end of the leakage monitoring chip. The leakage monitoring chip uses a special integrated circuit model NC37020.
另外噪音过滤电路包括两组，每组噪音过滤电路包括串接在电源输入端的两组串联电阻及一电容组成，用以过滤用电设备所产生的高频噪音信号，以防止其耦合至电源线路影响其他用电设备的工作。In addition, the noise filter circuit includes two groups. Each group of noise filter circuit includes two sets of series resistors and a capacitor connected in series at the power input end to filter high-frequency noise signals generated by electrical equipment to prevent them from coupling to the power line. Affect the work of other electrical equipment.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320350690.8U CN220139224U (en) | 2023-03-01 | 2023-03-01 | Leakage protection circuit with noise filtering function |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320350690.8U CN220139224U (en) | 2023-03-01 | 2023-03-01 | Leakage protection circuit with noise filtering function |
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