CN207764335U - A kind of detection circuit of leak current fault - Google Patents
A kind of detection circuit of leak current fault Download PDFInfo
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- CN207764335U CN207764335U CN201820096567.7U CN201820096567U CN207764335U CN 207764335 U CN207764335 U CN 207764335U CN 201820096567 U CN201820096567 U CN 201820096567U CN 207764335 U CN207764335 U CN 207764335U
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Abstract
A kind of detection circuit of leak current fault, it is characterised in that：The detection circuit includes signal acquisition module, signal receiving module, main control module and alarm module, the signal acquisition module includes to be separately connected two input terminals of ground wire and zero curve, first output end of the signal acquisition module is connected with the first input end of the signal receiving module, the second output terminal of signal acquisition module is connected with the second input terminal of the signal receiving module, the output end of the signal receiving module is connected with the signal receiving end of the main control module, the alarm module described in the signal transmitting terminal connection of the main control module.
Description
Technical field
The utility model is related to a kind of detection circuits of leak current fault.
Background technology
With the development of modern technologies, many household appliances can all have detection of electrical leakage module inside it, that is, pass through detection
Whether ground wire or zero curve have electric current to determine whether leaking electricity, it is therefore an objective to prevent lengthening of the housed device with usage time
Because of improper use or there is aging circuit, leaky caused by forceful electric power connecting line has breakage etc., to improve equipment use
Safety coefficient.
But in real life, since the power grid quality level of each region is uneven, just along with leakage current pulse itself
Ripple and the fluctuation of accidental power grid quality are had, interference is so that use existing electric leakage caused by these power network fluctuations and ripple
Detection method is easy to generate wrong report, and then directly results in and housed device report failure height occurs or can not use equipment normal function
The problems such as, seriously affect user experience.
Utility model content
Technical problem to be solved in the utility model be for the above-mentioned prior art present situation and provide a kind of simple in structure
And it can effectively reduce the leak current fault detection circuit of fault misdescription.
Technical solution is used by the utility model solves above-mentioned technical problem：A kind of detection circuit of leak current fault,
It is characterized in that：The detection circuit includes signal acquisition module, signal receiving module, main control module and alarm module,
The signal acquisition module includes to be separately connected two input terminals of ground wire and zero curve, the first output of the signal acquisition module
End is connected with the first input end of the signal receiving module, and the second output terminal of signal acquisition module and the signal receive mould
Second input terminal of block is connected, and the output end of the signal receiving module is connected with the signal receiving end of the main control module, institute
State the signal transmitting terminal connection of the main control module alarm module.
Preferably, following circuit structure may be used in the signal acquisition module：Signal acquisition module includes first
Diode, the second diode, first resistor and second resistance, wherein one end of the first resistor connects ground wire, first electricity
The other end of resistance is connected with the anode of first diode, the cathode of first diode all the way with second diode
Cathode is connected, and another way is connected to the first input end of the signal receiving module；One end of the second resistance and zero curve phase
Even, the other end of the second resistance is connected with the anode of second diode all the way, and another way is connected to the signal and receives
The cathode of second input terminal of module, second diode connects the first input end of the signal receiving module.
In order to further increase anti-interference ability, as further preferred, the signal receiving module can simply wrap
Optocoupler, 3rd resistor, the 4th resistance and capacitance are included, wherein the light emitting diode anode of the optocoupler is received as the signal
The first input end of module, the second input terminal of the light emitting diode cathode of the optocoupler as the signal receiving module；It is described
The reception diode collector of optocoupler connects DC power supply through the 4th resistance all the way, and another way is connected through the 3rd resistor
The reception diode emitter of the signal receiving end of the main control module, the optocoupler is grounded all the way, and another way is through the capacitance
Connect the signal receiving end of the main control module.
Preferably, the main control module can select Fujitsu's MB95690K family chips or auspicious Sa RL78/G13 series
Chip.Specifically, may be used model MB95F636K either MB95F634K or MB95F698K or MB95F696K or
Any one in the chips such as person R5F100LE or R5F101BE.
As further preferred, the alarm module includes the 5th resistance, triode and buzzer, wherein the master
The signal transmitting terminal of control module connects the base stage of the triode through the 5th resistance, and the emitter of the triode is grounded,
The collector of the triode is connected to the buzzer, and the buzzer is by DC-voltage supply.
Compared with prior art, the utility model has the advantage of：A kind of simple and effective electric-leakage detection circuit is designed, is adopted
With the real-time detection to electric leakage signal, and avoid to be interfered by power grid by the level of delay judgement detection mouth or ripple draw
The wrong report risen, cailure rate of false positives are reduced with this, ensure the normal work of circuit, realize the accurate judgement to leak current fault, finally
It reminds user that leak current fault occurs by warning circuit, improves safety in utilization and reliability.
Description of the drawings
Fig. 1 is that the leak current fault of the utility model embodiment detects main circuit schematic diagram.
Fig. 2 is the leak current fault warning circuit schematic diagram of the utility model embodiment.
Fig. 3 is the leak current fault detection method flow chart of the utility model embodiment.
Specific implementation mode
The utility model is described in further detail below in conjunction with attached drawing embodiment.
As shown in Fig. 1~2, the present embodiment is related to a kind of detection circuit of leak current fault, which includes signal
Acquisition module 1, signal receiving module 2, main control module MCU and alarm module 3, signal acquisition module 1 include that can be separately connected
Two input terminals of ground wire G and zero curve N, the first input of the first output end and signal receiving module 2 of the signal acquisition module 1
End 21 is connected, and the second output terminal of signal acquisition module 1 is connected with the second input terminal 22 of signal receiving module 2, and signal receives
The output end of module 2 is connected with the signal receiving end INTP of main control module MCU, the signal transmitting terminal P01 connections of main control module MCU
Alarm module 3.
The main control module MCU can preferred Fujitsu's (Fujitsu) MB95690K family chips or auspicious Sa
(RENESAS) RL78/G13 family chips, specifically, may be used following model be respectively MB95F636K, MB95F634K,
Any one chip in MB95F698K, MB95F696K, R5F100LE or R5F101BE.
The signal acquisition module 1 includes the first diode D1, the second diode D2, first resistor R1 and second resistance
R2, wherein one end of first resistor R1 connects ground wire G, the positive phase of the other end of first resistor R1 and the first diode D1
Even, the cathode of first diode D1 is connected with the cathode of the second diode D2 all the way, and another way is connected to signal receiving module 2
First input end；One end of second resistance R2 is connected with zero curve N, the other end of second resistance R2 all the way with the second diode
The anode of D2 is connected, and another way is connected to the second input terminal of signal receiving module 2, the cathode connection signal of the second diode D2
The first input end of receiving module 2.
The signal receiving module 2 includes optocoupler U1,3rd resistor R3, the 4th resistance R4 and capacitance C, wherein optocoupler
The light emitting diode cathode of first input end 21 of the light emitting diode anode of U1 as the signal receiving module 2, optocoupler U1 is made
For the second input terminal 22 of the signal receiving module 2；The reception diode collector of optocoupler U1 all the way through the 4th resistance R4 connections+
5V DC power supplies, signal receiving end INTP of the another way through 3rd resistor R3 connection main control modules MCU, two pole of reception of optocoupler U1
Pipe emitter is grounded all the way, signal receiving end INTP of the another way through capacitance C connection main control modules MCU.
Alarm module 3 includes the 5th resistance R5, triode Q and buzzer BZ, wherein the signal of main control module MCU is sent out
Penetrate end base stages of the P01 through the 5th resistance R5 connecting triodes Q, the emitter ground connection of triode Q, the collector connection of triode Q
To buzzer BZ, buzzer BZ is by+5V DC-voltage supplies.
Machine after the power is turned on, electric-leakage detection circuit start to work, when machine occur electric leakage (i.e. zero curve N or casing have friendship
When galvanic electricity), voltage change will be generated before ground wire G and zero curve N, after the voltage difference of generation reaches certain value, optocoupler U1
It is connected, saltus step will occur for the signal on the signal receiving end INTP of main control module MCU, and hereafter, main control module MCU passes through to letter
The incoming level of number receiving terminal INTP monitors and combines delay judgement, may finally be made to leak current fault and accurate judge knot
Fruit reduces the fault misdescription caused by interference.
As shown in figure 3, for using the leak current fault detection method of above-mentioned leak current fault detection circuit, it is normal to be set in circuit
It (does not leak electricity) when work, the initial signal of the signal receiving end INTP of main control module MCU is high level, leak current fault detection
Method includes having the following steps：
Step 1: whether the signal receiving end INTP of detection main control module MCU occurs signal saltus step, if so, then opening leakage
Electrosemaphore position Flag0 executes next step；If not, recycling this step；
Step 2: judging whether the signal receiving end INTP of main control module MCU is low level, if so, then low level continues
Time timing, and execute next step；If not, electric leakage flag bit Flag0 is removed, step 1 is returned to；
Step 3: whether the low duration of the signal receiving end INTP of main control module MCU reaches preset value T0, such as
It is then to execute next step；If not, returning to step 1；Preset value T0 ranging from 2~5ms.
Step 4: electric leakage flag bit Flag0 is removed, the low duration of signal receiving end INTP is removed and signal
The high level lasting time of receiving terminal INTP is removed, meanwhile, detection of electrical leakage counts Cnt0 and starts, and executes step 5；
Step 4.1, main control module MCU signal receiving end INTP whether be high level, if so, the flag bit that then leaks electricity
Flag0 is removed, and high level lasting time timing, and executes next step 4.2；If not, returning to step 1；
Step 4.2, main control module MCU the high level lasting time of signal receiving end INTP whether reach preset value T1,
If so, then detection of electrical leakage counts Cnt0 removings, return to step one；If not, direct return to step one.In the step 4.2
Preset value T1 ranging from 100~300ms.
Step 5: whether timer timing time reaches preset value t1, if so, then executing next step；If not, returning to
Step 1；Preset value t1 is the time in 4-6 power network fluctuation period, to take preset value t1's under 50Hz standard mains frequencies
Ranging from 80~120ms.
Step 6: detection of electrical leakage counts whether Cnt0 is more than preset value n0, if so, then Cnt0>The duration timing of n0,
And execute next step；If not, detection of electrical leakage counts Cnt0 removings, Cnt0>The duration of n0 removes, and is then return to step
One；
Step 7: judging Cnt0>Whether the duration of n0 reaches preset value T2, if so, then detection of electrical leakage counts Cnt0
It removes, while opening leak current fault flag bit Flag1, then execute next step；If not, returning to step 1；Preset value T2
Ranging from 2~4s.
Step 8: leak current fault occurs, alarm is prompted.Main control chip drives buzzer BZ, driving by output pin P01
Buzzer BZ sends out alarm
In above-mentioned steps one to eight, described preset value T0, t1, T1 and T2 meet following condition：T0<t1<T1<T2.
The detection method of the present embodiment is by the judgement of the incoming level after being redirected to signal and in conjunction with delay time
Judge, to filter out transient interference and the caused interference of cyclic fluctuation, improves the accuracy of leak current fault detection, wherein step
Rapid 4.1 and 4.2 be to further exclude electric leakage possibility and the sub-process that is arranged, the sub-process and the flow after step 5
It is that parallel logical relation is equivalent to referring to attached drawing 3 and increases a dual fail-safe in main flow, it is accurate thus improves detection
Property.
In the leak current fault detection method of the present embodiment, the initial signal of the signal receiving end INTP of main control module MCU can
Think high level or low level, if initial signal is set as low level, once main control module is detected in step 1
Signal saltus step occurs for the signal receiving end INTP of MCU, then step 2 first judges whether the level of signal receiving end INTP is high electricity
Flat, step 3 judges whether high level delay reaches setting value again, meanwhile, the high level in former step 4.1 and 4.2 judges and prolongs
When timing be substituted for low level judge and delay timing.
The present embodiment avoids possibility using the real-time detection to electric leakage signal by the level of delay judgement detection mouth
It is reported by mistake caused by power grid interference or ripple, cailure rate of false positives is reduced with this, ensure the normal work of circuit, realized to electric leakage event
The accurate judgement of barrier reminds user that leak current fault occurs, improves safety in utilization and reliability finally by warning circuit, to
The user experience that household electrical appliances can preferably be promoted, in particular for some high voltages load, can provide to the user it is safer, trust
Product function；In addition, the chip type selecting of the main control module MCU of the utility model is extensive, hardware plan is maintainable high, software
Algorithm is portable strong, applied widely, practicability is good.
Claims (5)
1. a kind of detection circuit of leak current fault, it is characterised in that：The detection circuit include signal acquisition module (1),
Signal receiving module (2), main control module (MCU) and alarm module (3), the signal acquisition module (1) includes to be separately connected
Two input terminals of ground wire (G) and zero curve (N), the first output end and the signal receiving module of the signal acquisition module (1)
(2) first input end is connected, the second output terminal of signal acquisition module (1) and the second of the signal receiving module (2) defeated
Enter end to be connected, the output end of the signal receiving module (2) and signal receiving end (INTP) phase of the main control module (MCU)
Even, signal transmitting terminal (P01) connection of the main control module (MCU) alarm module (3).
2. the detection circuit of leak current fault according to claim 1, it is characterised in that：Signal acquisition module (1) packet
The first diode (D1), the second diode (D2), first resistor (R1) and second resistance (R2) are included, wherein first electricity
One end connection ground wire (G) of (R1) is hindered, the other end of the first resistor (R1) is connected with the anode of first diode (D1),
The cathode of first diode (D1) is connected with the cathode of second diode (D2) all the way, and another way is connected to the signal
The first input end of receiving module (2)；One end of the second resistance (R2) is connected with zero curve (N), the second resistance (R2)
The other end is connected with the anode of second diode (D2) all the way, and another way is connected to the of the signal receiving module (2)
Two input terminals, the cathode of second diode (D2) connect the first input end of the signal receiving module (2).
3. the detection circuit of leak current fault according to claim 1, it is characterised in that：Signal receiving module (2) packet
Optocoupler (U1), 3rd resistor (R3), the 4th resistance (R4) and capacitance (C) are included, wherein the light emitting diode of the optocoupler (U1)
First input end of the anode as the signal receiving module (2), the light emitting diode cathode of the optocoupler (U1) is as the signal
Second input terminal of receiving module (2)；The reception diode collector of the optocoupler (U1) is all the way through the 4th resistance (R4)
DC power supply is connected, another way connects the signal receiving end (INTP) of the main control module (MCU) through the 3rd resistor (R3),
The reception diode emitter of the optocoupler (U1) is grounded all the way, and another way connects the main control module through the capacitance (C)
(MCU) signal receiving end (INTP).
4. the detection circuit of leak current fault according to claim 3, it is characterised in that：The main control module (MCU) is richness
Scholar leads to MB95690K family chips or auspicious Sa RL78/G13 family chips.
5. the detection circuit of leak current fault according to claim 1, it is characterised in that：The alarm module (3) includes
5th resistance (R5), triode (Q) and buzzer (BZ), wherein the signal transmitting terminal (P01) of the main control module (MCU) passes through
5th resistance (R5) connects the base stage of the triode (Q), the emitter ground connection of the triode (Q), the triode
(Q) collector is connected to the buzzer (BZ), and the buzzer (BZ) is by DC-voltage supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820096567.7U CN207764335U (en) | 2018-01-19 | 2018-01-19 | A kind of detection circuit of leak current fault |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820096567.7U CN207764335U (en) | 2018-01-19 | 2018-01-19 | A kind of detection circuit of leak current fault |
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| CN207764335U true CN207764335U (en) | 2018-08-24 |
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| CN201820096567.7U Active CN207764335U (en) | 2018-01-19 | 2018-01-19 | A kind of detection circuit of leak current fault |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109917278A (en) * | 2019-03-29 | 2019-06-21 | 宁波奥克斯电气股份有限公司 | A kind of forceful electric power logic detection system and method |
| CN110793158A (en) * | 2019-11-06 | 2020-02-14 | 广州华凌制冷设备有限公司 | Control circuit of alternating current fan and state detection method of alternating current fan of air conditioner |
-
2018
- 2018-01-19 CN CN201820096567.7U patent/CN207764335U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109917278A (en) * | 2019-03-29 | 2019-06-21 | 宁波奥克斯电气股份有限公司 | A kind of forceful electric power logic detection system and method |
| CN110793158A (en) * | 2019-11-06 | 2020-02-14 | 广州华凌制冷设备有限公司 | Control circuit of alternating current fan and state detection method of alternating current fan of air conditioner |
| CN110793158B (en) * | 2019-11-06 | 2021-11-23 | 广州华凌制冷设备有限公司 | Control circuit of alternating current fan and state detection method of alternating current fan of air conditioner |
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