CN209282811U - Detection of electrical leakage IC chip, leakage current detection protection circuit and electrical equipment - Google Patents
Detection of electrical leakage IC chip, leakage current detection protection circuit and electrical equipment Download PDFInfo
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Abstract
The utility model discloses a kind of detection of electrical leakage IC chip, leakage current detection protection circuit and electrical equipment, which includes the signal conversion circuit successively connecting with sensor, digital filter, detection control circuit and silicon-controlled drive control circuit；Wherein, the analog detection signal for receiving sensor output is amplified processing by multiple signal conversion circuits, and exported after being converted to digital voltage signal, analog detection signal includes power supply voltage signal, earthing detection signal, supply voltage detection signal, and/or ground fault detection signal；Digital filter is filtered digital voltage signal；Silicon-controlled drive control circuit, for and after reaching timing time, driving controlled silicon conducting, carrying out trip action to control buckle releaser when receiving detection control circuit output characterization voltage signal and being greater than the control signal of predetermined amplitude threshold value.The problem of the utility model solves current leakage detection protection chip poor anti jamming capability, easily triggers error protection action.
Description
Technical Field
The utility model relates to an electronic circuit technical field, in particular to electric leakage detection integrated circuit chip, electric leakage detection protection circuit and electrical equipment.
Background
With the popularization and application of household appliances, the standards for human body electric shock protection are becoming stricter, the minimum protection action current defined by the current leakage protection standard UL943 of the insurance commercial laboratory (UL) is only 5 milliamperes, the leakage current is required to be 4 milliamperes or less, no misoperation is allowed to exist, and meanwhile, when the leakage current is more than or equal to 6mA, protection action is required to be carried out.
At present, as the standards of human body electric shock protection are becoming stricter, the product parameter requirements of the leakage detection protection chip on peripheral devices are higher. The current standard requires to carry out accurate judgement to the leakage current, and present leakage current detection circuitry receives external interference signal easily when detecting the leakage current, leads to appearing triggering error's protection action.
In order to solve the problem of interference resistance, in some existing embodiments, for example, in the leakage protection detection chips RV4010/RV4141/RV4145/RV4146/RV4149 series of fairchild company in the united states, a bipolar integrated circuit process is adopted, a high-performance operational amplifier is manufactured by using the low noise characteristic of the bipolar process to amplify a leakage signal, an analog comparator is used to perform amplitude comparison and judgment, and a delay control logic is added in the subsequent series chips to improve the interference resistance. It can be seen from the evolution of the series of chips that the circuit design which follows the former principle and method is difficult because the human body electric shock protection standard of the new generation is made stricter, and the chip pays larger cost in the aspects of area and cost.
In addition, VG54123A produced by double-denier microelectronics is representative of another class of chips. The chip continues the early principles and structures of the 54123 series chip, but uses a CMOS process for circuit implementation. The chip is superior in cost control due to the cost advantage of the CMOS semiconductor process. However, the chip scheme still inherits the prior circuit principle and detection method, and has poor performance in the aspect of anti-interference capability. In addition, the relatively large noise of the CMOS semiconductor process itself deteriorates the immunity of the series of chips.
A circuit principle for enhancing the interference capability of the 54123 leakage protection detection chip is provided in chinese patent (patent No. CN 105186448A). The anti-interference capability of the leakage detection protection chip can be improved to a certain extent by using a filter network formed by an additional resistor and a capacitor. However, the additional rc device increases the cost and the production flow, and is limited by the cost and the design, and it is impossible to implement a high-order filter network, so there is a limit to the filtering and suppressing of the interference signal.
Another chinese patent (CN201781262U) discloses a method for implementing leakage protection by using digital method. In the method of the patent, a leakage detection complete circuit is formed by a leakage sampling loop, an analog-to-digital (A/D) converter and an MCU (micro controller). A similar approach is also proposed in US utility model (US7193827B2), which uses a current transformer, a pre-amplifier circuit, an analog-to-digital converter, and a microprocessor to form a complete circuit for detecting leakage. Similar circuit structures and methods are also mentioned in US utility patent (US20090108967a1) and US utility patent (US9048656B 2). According to the method, the analog-digital converter and the microcontroller are used, and the electric leakage judgment is carried out by using a digital method, so that the electric leakage detection can be carried out more flexibly and conveniently. However, these circuits and methods are implemented at the circuit board level, and if they are integrated directly into the chip, the additional microprocessor or microcontroller will cause a drastic increase in chip cost. Meanwhile, according to the UL943 standard, the inside of the package contains the leakage protection implemented by programming of the microcode, which requires additional standard authentication. This will increase the design cycle and design cost of the product. In addition, due to the performance limitation of the microcontroller or microprocessor, it is difficult to implement a complex digital signal processing method, and thus the final detection and decision performance is also greatly limited.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an electric leakage detection integrated circuit chip, electric leakage detection protection circuit and electrical equipment, it is poor to aim at solving current electric leakage detection protection chip interference killing feature, easily triggers the problem of mistake protection action.
In order to achieve the above object, the present invention provides an electric leakage detection integrated circuit chip, which is applied in an electric leakage detection protection circuit, wherein the electric leakage detection protection circuit comprises a plurality of sensors, a thyristor and a release; the leakage detection integrated circuit chip comprises a plurality of signal conversion circuits, a digital filter, a detection control circuit and a silicon controlled drive control circuit, wherein the input ends of the signal conversion circuits are connected with the output ends of the sensors in a one-to-one correspondence manner, and the output ends of the signal conversion circuits are respectively connected with the input end of the detection control circuit; the output end of the detection control circuit is connected with the input end of the silicon controlled rectifier drive control circuit; the output end of the silicon controlled rectifier driving control circuit is connected with the silicon controlled rectifier; wherein,
the signal conversion circuits are used for amplifying received analog detection signals output by the sensors, converting the analog detection signals into digital voltage signals and outputting the digital voltage signals, wherein the analog detection signals comprise power supply voltage signals, grounding detection signals, power supply voltage detection signals and/or grounding fault detection signals;
the digital filter is used for filtering the digital voltage signal;
the detection control circuit is used for outputting a corresponding control signal according to the digital voltage signal output by the digital filter;
and the silicon controlled rectifier driving control circuit is used for driving the silicon controlled rectifier to be conducted when receiving a control signal which indicates that the analog voltage signal output by the detection control circuit is greater than a preset threshold value and after the timing time is reached, so as to control the tripper to carry out tripping action.
Optionally, the leakage detection integrated circuit chip further includes an excitation circuit, an input end of the excitation circuit and an output end of the detection control circuit, and the excitation circuit is configured to output a corresponding excitation signal when receiving a control signal indicating a ground fault of the electrical equipment output by the detection control circuit.
Optionally, each of the signal conversion circuits includes a programmable gain amplifier and an a/D converter, an input end of the programmable gain amplifier is an input end of the signal conversion circuit, an output end of the programmable gain amplifier is connected to an input end of the a/D converter, and an output end of the a/D converter is an output end of the signal conversion circuit.
Optionally, the leakage detection integrated circuit chip further includes a serial logic circuit, a first input end of the serial logic circuit is connected to an output end of the detection control circuit, and a second input end of the serial logic circuit is connected to an output end of a thyristor drive control circuit of the external leakage detection integrated circuit chip;
and the series logic circuit is used for triggering the conduction of the silicon controlled rectifier to control the release to release when receiving the control signal which is output by the detection control circuit and represents that the current detection signal is a leakage current signal and/or receiving the driving signal output by the silicon controlled rectifier driving control circuit of the external leakage detection integrated circuit chip.
Optionally, the digital filter includes a gain adjustment module, a down-sampling filter, a down-sampling module, and a band-pass filter, which are sequentially connected to the signal conversion circuit.
Optionally, the detection control circuit includes a signal detection module and a delay control module sequentially connected to the digital filter; wherein,
the signal detection module is used for detecting the digital voltage signal output by the digital filter and outputting a leakage detection signal when the current value of the voltage signal is detected to be larger than a preset current threshold value;
and the delay control module is used for generating an electric leakage protection action signal when the duration time of receiving the electric leakage detection signal reaches a preset time or according to the frequency of receiving the electric leakage detection signal so as to trigger the conduction of the controllable silicon and control the tripper to carry out tripping action.
Optionally, the leakage detection integrated circuit chip further includes a clock generation circuit, and an output end of the clock generation circuit is connected to the digital filter circuit and the detection control circuit; and the clock generating circuit is used for providing clock signals for the digital filter circuit and the detection control circuit.
Optionally, the leakage detection integrated circuit chip further includes a memory, and the memory is respectively connected to the signal conversion circuit, the digital filter, and the detection control circuit;
and the memory is used for storing the parameter configurations corresponding to the signal conversion circuit, the digital filter and the detection control circuit.
Optionally, the leakage detection protection circuit includes a sensor, a rectification circuit, a thyristor, a release, and the leakage detection integrated circuit chip described above;
the input end of the rectifying circuit is used for being connected with an alternating current power supply, the sensor is connected with the input end of the rectifying circuit, and the output end of the sensor is sequentially connected with the electric leakage detection integrated circuit chip, the controllable silicon and the release.
The utility model also provides an electrical equipment, include as above electric leakage detection integrated circuit chip, perhaps include as above electric leakage detection protection circuit.
The utility model discloses a set up signal conversion circuit, in order to receive the analog detection signal of sensor output carries out the amplification processing to output to digital filter after converting into digital voltage signal, thereby it is right digital voltage signal carries out output to detection control circuit after the filtering processing, so that detection control circuit basis digital filter outputs digital voltage signal exports corresponding control signal, and then makes silicon controlled rectifier drive control circuit receive detection control circuit output sign voltage signal is when the control signal of leakage current signal, the drive the silicon controlled rectifier switches on, with control the release carries out the tripping action. The utility model discloses electric leakage detection protection chip has improved electrical equipment's interference killing feature, the utility model provides an electric leakage detection protection chip when the transient leakage current signal that detects is interference signal, easily trigger the error protection action and control electrical equipment outage stop work, lead to earth leakage protection device malfunction, influence user's normal use's problem.
It can be understood that the present embodiment provides a multi-channel signal conversion circuit to access different voltage signals representing current detection, voltage detection, and temperature detection. For example, a voltage signal that detects whether there is a leakage on the ground lead of a three-phase plug, or a voltage signal that detects a current overload may be switched in. Or the voltage signal of overvoltage/undervoltage of the power supply voltage, so as to realize the leakage, overcurrent, overload, undervoltage or overvoltage protection of the electrical equipment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an embodiment of an electrical leakage detection integrated circuit chip according to the present invention;
fig. 2 is a schematic structural diagram of another embodiment of the leakage detecting integrated circuit chip of the present invention;
fig. 3 is a schematic structural diagram of another embodiment of the leakage detecting integrated circuit chip of the present invention.
The reference numbers illustrate:
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides an electric leakage detection integrated circuit chip is applied to in the electrical equipment, for example electrical equipment such as electric water heater, washing machine, perhaps has among electric leakage detection protect function's supply socket, power plug.
In the leakage detection protection circuit, the leakage detection protection circuit includes a sensor, a thyristor, and a release. When the electric leakage phenomenon occurs in the electrical equipment, in the electrical loop, a part of current flows into the ground through the ground wire or a human body instead of flowing back to the power supply from the live wire through the zero line, so that the electric shock danger exists when a user uses the electrical equipment. Therefore, most of electrical equipment is provided with a current detection device for detecting whether the zero line or the live line leaks electricity or not, or the electrical equipment is provided with the current detection device for detecting whether the ground line is electrified or not, and when the zero line or the live line leaks electricity or the ground line is electrified, the silicon controlled rectifier is triggered to be conducted, so that the tripper is electrified and disconnected, and the external power supply is interrupted to supply power to the electrical equipment.
In order to solve the above problem, referring to fig. 1, in an embodiment of the present invention, the leakage detecting protection circuit includes a plurality of sensors, a thyristor, and a release; the leakage detection integrated circuit chip is characterized by comprising a plurality of signal conversion circuits 10, a digital filter 20, a detection control circuit 30 and a silicon controlled drive control circuit 40, wherein the input ends of the signal conversion circuits 10 are correspondingly connected with the output ends of the sensors one by one, and the output ends of the signal conversion circuits 10 are respectively connected with the input end of the detection control circuit 30; the output end of the detection control circuit 30 is connected with the input end of the controlled silicon drive control circuit 40; the output end of the controlled silicon drive control circuit 40 is connected with the controlled silicon; wherein,
the signal conversion circuits 10 are configured to amplify the received analog detection signals output by the sensors, convert the analog detection signals into digital voltage signals, and output the digital voltage signals, where the analog detection signals include a power supply voltage signal, a ground detection signal, and a power supply voltage detection signal;
the digital filter 20 is configured to perform filtering processing on the digital voltage signal;
the detection control circuit 30 is configured to output a corresponding control signal according to the digital voltage signal output by the digital filter 20;
the thyristor drive control circuit 40 is configured to drive the thyristor to be turned on when receiving a control signal indicating that the analog voltage signal output by the detection control circuit 30 is greater than a preset threshold value, so as to control the trip device to trip.
In this embodiment, the sensor may be a voltage sensor, a current transformer, a temperature sensor, and the like, an induction coil of the current transformer is annularly disposed on the periphery of a power line (a live line and a zero line) or the periphery of a ground line to detect a leakage current signal, and when the leakage current signal is detected, the output end of the current transformer generates a signal proportional to the leakage current, that is, a current detection signal, and outputs the signal to the signal conversion circuit 10. The current detection signal is an analog signal, and the signal conversion circuit 10 amplifies the signal after receiving the signal, converts the signal into a digital current detection signal, and outputs the digital current detection signal.
The digital filter 20 filters the digital current detection signal and outputs the filtered signal to the detection control circuit 30. The detection control circuit 30 is used for judging comparison according to the detected digital signal and a preset current threshold value. Specifically, it may be determined that there is leakage when the amplitude of the current detection signal is greater than the amplitude of the preset current threshold. The detection control circuit 30 may also track the leakage current signal, for example, by setting a timer, when the duration of the leakage current signal is counted and the duration reaches a preset threshold, it is determined that the leakage current signal is not a false trigger signal, that is, a control signal may be output to the thyristor drive control circuit 40, so as to trigger the conduction of the thyristor and energize the release connected in series in the loop, so as to disconnect the trip device in the loop and cut off the power supply, thereby completing the leakage protection action. By the arrangement, the problem of false triggering caused by current sudden change signals caused by glitches or burst interference can be solved.
The utility model discloses a set up signal conversion circuit 10, in order to receive the analog detection signal of sensor output carries out the amplification processing to output to digital filter 20 after converting into digital voltage signal, thereby it is right digital voltage signal carries out output to detection control circuit 30 after the filtering processing, so that detection control circuit 30 basis digital filter 20 exports digital voltage signal exports corresponding control signal is exported, and then makes silicon controlled rectifier drive control circuit 40 receive detection control circuit 30 exports when the control signal of sign voltage signal for the leakage current signal, the drive the silicon controlled rectifier switches on, in order to control the release carries out the tripping action. The utility model discloses electric leakage detection protection chip has improved electrical equipment's interference killing feature, the utility model provides an electric leakage detection protection chip when the transient leakage current signal that detects is interference signal, easily trigger the error protection action and control electrical equipment outage stop work, lead to earth leakage protection device malfunction, influence user's normal use's problem.
It can be understood that the present embodiment provides the multiple signal conversion circuit 10 to access different voltage signals representing current detection, voltage detection, and temperature detection. For example, a voltage signal that detects whether there is a leakage on the ground lead of a three-phase plug, or a voltage signal that detects a current overload may be switched in. Or the voltage signal of overvoltage/undervoltage of the power supply voltage, so as to realize the leakage, overcurrent, overload, undervoltage or overvoltage protection of the electrical equipment.
It should be noted that, in the existing leakage detection protection circuit, there may be a very few function of setting ground fault detection or lack of perfect reverse wiring detection function, and when the installer connects the power line reversely due to misoperation, the leakage detection protection circuit may not be able to exert the leakage protection function, and loses its function of ground fault protection. Thus, the earth leakage detection protection circuit may present a risk of installation, which is often difficult for a user to find when a power cord reversal occurs.
In order to solve the above problem, the leakage detection integrated circuit chip further includes an excitation circuit 50, an input end of the excitation circuit 50 and an output end of the detection control circuit 30, and the excitation circuit 50 (output end PIN8) is configured to receive a control signal indicating a ground fault of an electrical apparatus output by the detection control circuit 30 and output a corresponding excitation signal.
In this embodiment, the excitation circuit 50 may be implemented by using electronic components such as an operational amplifier and a main control switch, and a current signal in the ground line is detected by using a current transformer, when the detection control circuit 30 detects that the leakage detection protection circuit is in a working state and a wiring error is caused by a wiring misoperation during installation, the wiring error is displayed, and a corresponding control signal is output to the excitation circuit 50, so that the excitation circuit 50 outputs an excitation signal, which can represent a ground error caused by detecting a short circuit between the ground line and the neutral line, and the excitation signal may be a power indication signal or a switch driving signal, and the excitation signal is output to a subsequent circuit, such as a circuit breaker and an indicator light, to represent a ground fault of the leakage detection protection circuit, thereby avoiding a potential safety hazard of the circuit caused by a failure of a leakage protection function due to a wiring error.
Referring to fig. 1 to 3, in an alternative embodiment, the leakage detecting integrated circuit chip further includes a series logic circuit (not shown), a first input terminal of the series logic circuit is connected to the output terminal PIN1 of the detection control circuit 30, and a second input terminal of the series logic circuit is connected to the output terminal of the thyristor drive control circuit 40 of the external leakage detecting integrated circuit chip;
the serial logic circuit is configured to trigger the thyristor to be turned on when receiving the control signal that the detection control circuit 30 outputs the characteristic voltage signal as the leakage current signal and/or receiving the driving signal that the thyristor of the external leakage detection integrated circuit chip drives the control circuit 40 to output, so as to control the trip to trip.
In this embodiment, the series logic circuit may be implemented by using logic devices (gate circuits) such as an and gate, an or gate, and a nor gate, and in the same leakage detection integrated circuit chip, the series logic circuit may be provided with a plurality of second input terminals, or a plurality of series logic circuits, thereby implementing series connection of two or more leakage detection integrated circuit chips, that is, the output terminals of the thyristor drive control circuits 40 of the plurality of leakage detection integrated circuit chips are respectively connected to the same leakage detection integrated circuit chip, and the plurality of second input terminals of the series logic circuits are connected in a one-to-one correspondence manner. For example, one of the two leakage detecting integrated circuit chips is connected to the input terminal of the other leakage detecting integrated circuit chip, that is, the second input terminal of the serial logic circuit, through the output terminal of the thyristor driving control circuit 40. Thus, by arranging the multiple paths of leakage detection integrated circuit chips, after any path of leakage detection integrated circuit chip detects a leakage protection signal, the silicon controlled rectifier driving control circuit 40 in the same leakage detection integrated circuit chip can be triggered to act, so that the leakage detection protection circuit detects and protects the part of the electrical equipment, which is easy to generate leakage, so that the range of leakage protection of the electrical equipment is expanded.
Referring to fig. 1 to 3, in an alternative embodiment, each of the signal conversion circuits 10 includes a programmable gain amplifier 11 and an a/D converter 12, wherein the input terminals (PIN6 and PIN7) of the programmable gain amplifier 11 are input terminals of the signal conversion circuit 10, the output terminal of the programmable gain amplifier 11 is connected to the input terminal of the a/D converter 12, and the output terminal of the a/D converter 12 is an output terminal of the signal conversion circuit 10.
The programmable gain amplifier 11 may be implemented by a current amplifier, a voltage amplifier or a transimpedance amplifier. The amplifier is used for amplifying the leakage signal detected by the sensor, and converting the leakage signal into a digital signal through the a/D converter 12 for output. The gain programmable amplifier may be configured as a differential input, or may be configured as a single-ended input, and this embodiment may be selected as a differential input, that is, two input terminals of the gain programmable amplifier are respectively connected to the output terminals of the sensor.
In the above embodiment, the leakage detecting integrated circuit further includes a clamping diode D2, and two diodes of each of the clamping diodes D2 are connected in anti-phase parallel between the first signal input terminal and the second signal input terminal of the programmable gain amplifier 11. Wherein the first signal input terminal may be connected to ground.
Referring to fig. 1 to 3, in an alternative embodiment, the leakage detecting integrated circuit chip further includes a reference source circuit 60, an input PIN2 of the reference source circuit 60 is used for accessing a power supply, and an output terminal of the reference source circuit 60 is connected to the a/D converter 12; the reference source circuit 60 further includes a reference ground input PIN3, and the reference source circuit 60 is configured to convert the accessed power supply into a reference power supply, and then provide the reference power supply for the a/D converter 12.
In this embodiment, the reference source circuit 60 is used to provide a high-stability voltage reference and/or current reference for the a/D converter 12 and the various circuit blocks in the chip. After the chip is powered on, each module can be powered on, reset and set according to a given sequence, and the normal work of the circuit performance is ensured.
Referring to fig. 1 to 3, in an alternative embodiment, the digital filter 20 includes a gain adjustment module 21, a down-sampling filter 22, a down-sampling module 23, and a band-pass filter 24, which are sequentially connected to the signal conversion circuit 10.
The gain adjustment module 21 is configured to perform fine adjustment on the amplitude of the input signal, so that the amplitude of the effective signal is within a set range, and the word length requirement for subsequent digital signal processing can be reduced. Gain adjustment module 21 may multiply the input signal by a fixed factor, for example, the gain adjustment range of programmable gain amplifier 11 is typically greater than 60dB, and when gain adjustment module 21 increments by 0.1dB, the gain adjustment range from-6 dB to 6dB may be covered. By cooperating with the programmable gain amplifier 11, a fine gain adjustment can be achieved over a very wide gain adjustment range. The specific gain setting of the gain adjustment module 21310 may be set by the memory 80.
The down-sampling filter 22 can filter signals within the non-processing bandwidth to avoid signal aliasing during the down-sampling operation, the down-sampling module 23 can reduce the sampling rate of the voltage signal, and particularly can be used to reduce the data transmission rate or data size of the voltage signal, and by down-sampling the input signal to a lower sampling frequency, the operating frequency of the subsequent band-pass filter 24 and the detection control circuit 30 can be reduced, and the word length requirement on the filter can be reduced, thereby saving the power consumption and area of the digital circuit. For example, the frequency of the down-sampled signal is one or more frequencies between 300Hz and 100KHz, and the down-sampling is between 8 times and 10000 times corresponding to the sampling frequency of the front-end analog-to-digital converter.
The digital signal down-sampled by the down-sampling module 23 is input to the band-pass filter 24, and the band-pass filter 24 is used for filtering out interference signals outside the target frequency range. Specifically, the band-pass filter 24 can filter out high-frequency interference signals in the voltage signal, and enhance the anti-interference capability of the detection control circuit 30, so that the leakage detection characteristic of the whole chip has a strong anti-interference capability. The band pass filter 24 may also filter out dc and low frequency components of the voltage signal to avoid their possible interference with the detection control circuit 30. Several sets of different coefficients of the band-pass filter 24 are set simultaneously inside the chip, and the low-frequency cut-off frequency of the pass band of the band-pass filter 24 can be set between 2Hz and 55Hz and the high-frequency cut-off frequency is set between 55Hz and 150Hz when the low-frequency cut-off frequency is used for detecting the leakage current, corresponding to different selection of anti-interference capability and delay. The different bandpass filter 24 coefficients may be set by memory 80.
Referring to fig. 1 to 3, in an alternative embodiment, the detection control circuit 30 includes a signal detection module and a delay control module sequentially connected to the digital filter 20; wherein,
the signal detection module is configured to detect the digital voltage signal output by the digital filter 20, and output a leakage detection signal when a current value of the voltage signal is detected to be greater than a preset current threshold;
and the delay control module is used for generating an electric leakage protection action signal when the duration time of receiving the electric leakage detection signal reaches a preset time or according to the frequency of receiving the electric leakage detection signal so as to trigger the conduction of the controllable silicon and control the tripper to carry out tripping action.
In this embodiment, the signal detection module may employ an operational amplifier or software integrated in the memory 80 to detect and compare the voltage signal. The signal detection module is used for detecting whether a sinusoidal signal with the amplitude larger than a certain threshold exists in the voltage signal. The leakage current signal may be a sine wave with a frequency of 50Hz or 60Hz, and the ground fault signal may be a sine wave with a frequency of 10Hz to 100KHz, the frequency of the sine wave being consistent with the excitation frequency of the chip output. The sinusoidal signal detection may directly detect whether the amplitude of the voltage signal output by the band-pass filter 24 is greater than a given decision threshold, and when the amplitude of the voltage signal is greater than the given decision threshold, the signal may be determined to be a leakage current signal. Or after the voltage signal is subjected to discrete Fourier transform, whether the signal power within the target frequency range is larger than a judgment threshold value is calculated. Or may also be calculated as follows:
assuming that the input signal is X (t) and the target detection frequency is w, calculating the average value of signals (X (t) < sIn (wt) < 2+ > (X (t) < Cos (wt) < 2 >) in a period of time to obtain the average power of the signals in the period of time, and when the average power of the signals is greater than a given decision threshold, judging that a sinusoidal signal with the frequency of w exists, namely a drain voltage signal. One or more decision modes are designed in the signal detection module, and the selection of the specific mode and the setting parameters of the decision threshold value can be set through an electric programmable memory 80 in the chip.
The delay control module can be implemented by using electronic elements such as logic devices (gate circuits) such as an and gate, an or gate, and a nor gate, a timing controller, a timer, and a D flip-flop. When a leakage current signal is detected, the delay control module tracks and observes the signal for a period of time to determine whether the protection signal is a false trigger. Thereby possibly glitches or glitches causing malfunctions can be avoided. The specific setting parameters of the observation time and the delay time can be set by the electrically programmable memory 80. The delay signal and the plurality of clock signals required by the delay control block are provided by the clock generation circuit 70.
Referring to fig. 1 to 3, in an alternative embodiment, the leakage detecting integrated circuit chip further includes a clock generating circuit 70, and an output end of the clock generating circuit is connected to the digital filter 20 and the detection control circuit 30; the clock generating circuit 70 is configured to provide a clock signal to the digital filter 20 and the detection control circuit 30.
The clock generation circuit 70 may provide various clock signals required for the down-sampling block 23, the digital filter 20, the delay control block 32, and the like. In the clock generation circuit 70, the frequency and arrangement of the master clock and the multiphase clocks can be set by an electrically programmable memory 80 in the chip.
It should be noted that, at present, because the performance variation tolerance of peripheral devices (for example, parameter characteristics of a transformer) of the leakage detection protection circuit is large, a certain operation threshold and a certain non-operation threshold given by a standard are set, so that the yield of products when the leakage detection protection circuit is implemented is low.
In order to solve the above problem, referring to fig. 1 to 3, in an alternative embodiment, the leakage detecting integrated circuit chip further includes a memory 80, and the memory 80 is respectively connected to the signal converting circuit 10, the digital filter 20, and the detection control circuit 30;
the memory 80 is configured to store parameter configurations corresponding to the signal conversion circuit 10, the digital filter 20, and the detection control circuit 30.
In this embodiment, the memory 80 may be implemented by one or more of the non-volatile memories 80 such as an on-chip electrically programmable memory 80, a one-time programmable memory 80, a multi-time programmable memory 80, an electrically erasable programmable memory 80, a flash memory, and a phase change memory 80. The memory 80 stores parameter settings in each circuit module of the leakage detection integrated circuit, and the PINs PIN4 and PIN5 can realize that the memory 80 can adjust parameters of each circuit module. In the embodiment, the on-chip electrically programmable memory can be used for realizing the electric programming to adjust parameters such as the leakage threshold value of the chip, so that the off-chip devices with different parameter fluctuations can be well matched, and the yield is improved.
The utility model also provides an electric leakage detection protection circuit, which comprises a current transformer, a rectification circuit, a silicon controlled rectifier, a release and the electric leakage detection integrated chip;
the input end of the rectifying circuit is used for being connected with an alternating current power supply, the current transformer is used for detecting leakage signals and grounding error signals, a coil ring of the current transformer is arranged on the peripheries of a live wire and a zero line and is connected with the input end of the rectifying circuit, and the output end of the current transformer is sequentially connected with the leakage detection integrated chip, the silicon controlled rectifier and the release.
The silicon controlled rectifier is based on the control of the leakage detection integrated chip, and is conducted when a trigger signal output by the leakage detection integrated chip is received, so that an iron core of the tripper transmits tripping action to the tripping mechanism after the tripper is electrically attracted, and the tripping action is finished, so that leakage protection can be performed on electrical equipment when the electrical equipment has leakage.
The utility model also provides an electrical equipment, include as above electric leakage detection integrated circuit chip, perhaps include as above electric leakage detection protection circuit. It can be understood, because the utility model discloses above-mentioned electric leakage detection integrated circuit chip and electric leakage detection protection circuit have been used among the electrical equipment, consequently, the utility model discloses electrical equipment's embodiment includes the whole technical scheme of the whole embodiments of above-mentioned electric leakage detection integrated circuit chip and electric leakage detection protection circuit, and the technical effect that reaches is also identical, no longer gives unnecessary details here.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.
Claims (10)
1. A leakage detection integrated circuit chip is applied to a leakage detection protection circuit, and the leakage detection protection circuit comprises a plurality of sensors, a silicon controlled rectifier and a release; the leakage detection integrated circuit chip is characterized by comprising a plurality of signal conversion circuits, a digital filter, a detection control circuit and a silicon controlled drive control circuit, wherein the input ends of the signal conversion circuits are connected with the output ends of the sensors in a one-to-one correspondence manner, and the output ends of the signal conversion circuits are respectively connected with the input end of the detection control circuit; the output end of the detection control circuit is connected with the input end of the silicon controlled rectifier drive control circuit; the output end of the silicon controlled rectifier driving control circuit is connected with the silicon controlled rectifier; wherein,
the signal conversion circuits are used for amplifying received analog detection signals output by the sensors, converting the analog detection signals into digital voltage signals and outputting the digital voltage signals, wherein the analog detection signals comprise power supply voltage signals, grounding detection signals, power supply voltage detection signals and/or grounding fault detection signals;
the digital filter is used for filtering the digital voltage signal;
the detection control circuit is used for outputting a corresponding control signal according to the digital voltage signal output by the digital filter;
and the silicon controlled rectifier driving control circuit is used for receiving a control signal when the detection control circuit outputs a characteristic analog voltage signal which is larger than a preset amplitude threshold value, and driving the silicon controlled rectifier to be conducted after the timing time is reached so as to control the tripper to carry out tripping action.
2. The electrical leakage detection integrated circuit chip of claim 1, wherein the electrical leakage detection integrated circuit chip further comprises an excitation circuit, an input terminal of the excitation circuit and an output terminal of the detection control circuit, and the excitation circuit is configured to output a corresponding excitation signal when receiving a control signal indicating a ground fault of an electrical device output by the detection control circuit.
3. The electrical leakage detection integrated circuit chip of claim 1, wherein each of the signal conversion circuits comprises a programmable gain amplifier and an a/D converter, an input of the programmable gain amplifier is an input of the signal conversion circuit, an output of the programmable gain amplifier is connected to an input of the a/D converter, and an output of the a/D converter is an output of the signal conversion circuit.
4. The electrical leakage detection integrated circuit chip of claim 1, further comprising a series logic circuit, a first input terminal of the series logic circuit being connected to an output terminal of the detection control circuit, a second input terminal of the series logic circuit being connected to an output terminal of a thyristor drive control circuit of an external electrical leakage detection integrated circuit chip;
and the series logic circuit is used for triggering the conduction of the silicon controlled rectifier to control the release to release when receiving the control signal which is output by the detection control circuit and represents that the current detection signal is a leakage current signal and/or receiving the driving signal output by the silicon controlled rectifier driving control circuit of the external leakage detection integrated circuit chip.
5. The electrical leakage detection integrated circuit chip of claim 1, wherein the digital filter comprises a gain adjustment module, a down-sampling filter, a down-sampling module, and a band-pass filter sequentially connected to the signal conversion circuit.
6. The electrical leakage detection integrated circuit chip of claim 1, wherein the detection control circuit comprises a signal detection module and a delay control module sequentially connected to the digital filter; wherein,
the signal detection module is used for detecting the digital voltage signal output by the digital filter and outputting a leakage detection signal when the current value of the voltage signal is detected to be larger than a preset current threshold value;
and the delay control module is used for generating an electric leakage protection action signal when the duration time of receiving the electric leakage detection signal reaches a preset time or according to the frequency of receiving the electric leakage detection signal so as to trigger the conduction of the controllable silicon and control the tripper to carry out tripping action.
7. The electrical leakage detection integrated circuit chip according to any one of claims 1 to 6, wherein the electrical leakage detection integrated circuit chip further comprises a clock generation circuit, an output end of the clock generation circuit is connected with the digital filter circuit and the detection control circuit; and the clock generating circuit is used for providing clock signals for the digital filter circuit and the detection control circuit.
8. The electrical leakage detection integrated circuit chip according to any one of claims 1 to 6, further comprising a memory, the memory being connected to the signal conversion circuit, the digital filter, and the detection control circuit, respectively;
and the memory is used for storing the parameter configurations corresponding to the signal conversion circuit, the digital filter and the detection control circuit.
9. An electric leakage detection protection circuit, characterized in that, the electric leakage detection protection circuit comprises a sensor, a rectification circuit, a thyristor, a release and an electric leakage detection integrated circuit chip as claimed in any one of claims 1 to 8;
the input end of the rectifying circuit is used for being connected with an alternating current power supply, the sensor is connected with the input end of the rectifying circuit, and the output end of the sensor is sequentially connected with the electric leakage detection integrated circuit chip, the controllable silicon and the release.
10. An electrical device comprising the electrical leakage detection integrated circuit chip according to any one of claims 1 to 8, or comprising the electrical leakage detection protection circuit according to claim 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821952560.7U CN209282811U (en) | 2018-11-23 | 2018-11-23 | Detection of electrical leakage IC chip, leakage current detection protection circuit and electrical equipment |
| PCT/CN2019/106603 WO2020103554A1 (en) | 2018-11-23 | 2019-09-19 | Leakage detection integrated circuit chip, leakage detection protection circuit and electrical appliance |
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| CN201821952560.7U CN209282811U (en) | 2018-11-23 | 2018-11-23 | Detection of electrical leakage IC chip, leakage current detection protection circuit and electrical equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110488215A (en) * | 2019-09-17 | 2019-11-22 | 深圳市晶扬电子有限公司 | Current transformer tests circuit, method and device |
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| CN111413919A (en) * | 2020-04-11 | 2020-07-14 | 华卫(宁波)卫浴科技有限公司 | Intelligent urinal hand washing flushing control system based on P L C and use method thereof |
| CN111625029A (en) * | 2020-05-14 | 2020-09-04 | 中微半导体(深圳)股份有限公司 | Drive application specific integrated circuit and constant temperature machine |
| CN112054789A (en) * | 2020-09-10 | 2020-12-08 | 成都市凌巨通科技有限公司 | Chip high-power PIN switch control system |
| CN113391234A (en) * | 2021-05-17 | 2021-09-14 | 深圳市合广测控技术有限公司 | Electric leakage detection method, control device and electric leakage detection equipment |
| CN113391234B (en) * | 2021-05-17 | 2023-12-12 | 深圳市合广测控技术有限公司 | Leakage detection method, control device and leakage detection equipment |
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