CN110535095A - Leakage protection circuit, guard method and the lighting circuit using it - Google Patents
Leakage protection circuit, guard method and the lighting circuit using it Download PDFInfo
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- CN110535095A CN110535095A CN201910853375.5A CN201910853375A CN110535095A CN 110535095 A CN110535095 A CN 110535095A CN 201910853375 A CN201910853375 A CN 201910853375A CN 110535095 A CN110535095 A CN 110535095A
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 230000005611 electricity Effects 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 claims description 72
- 239000003990 capacitor Substances 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 6
- 238000005286 illumination Methods 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000012512 characterization method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/325—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors involving voltage comparison
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- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention proposes its lighting circuit of a kind of leakage protection circuit, guard method and application, and when input voltage is DC voltage, load switch conducting or load are enabled；When input voltage is alternating voltage, judge whether load input terminal leaks electricity, if load input terminal leaks electricity, controls load switch shutdown or control load does not enable；If load input terminal leakproof, load switch conducting or load are enabled.Compatible direct current input of the present invention, and leakage protection can be played, promote the safety in load disassembly process.
Description
Technical field
The present invention relates to field of power electronics, in particular to a kind of leakage protection circuit, guard method and the photograph using it
Bright circuit.
Background technique
During loading installation, because of the logical situation of possible generating unit tap during the installation process, if human body is not at this time
Careful contact, then be easy electric shock, influence safe operation.For example, fluorescent tube is divided into single ended input and double-width grinding two in lighting area
Kind, single ended input is actually that the connector of ac input end is arranged at the same end, and double-width grinding is then set up separately in fluorescent tube
Both ends, it is general still using double when being replaced to original fluorescent tube since more lamp holder also maintains the interface of both-end access
The fluorescent tube of input is held, therefore the fluorescent tube of double-width grinding still has larger market.
However, wherein lamp holder first usually will be inserted into one end especially in the case where double-width grinding, then it is inserted into another
One end, since operator's hand needs to grasp to be likely to be exposed the metal of end conduction in the end of fluorescent tube, be easy to happen electric shock
The case where.In Countries or area, using the creepage protection function of this kind of situation as must in Valuation Standard or specification
The functional module wanted.In the prior art, input power is generally alternating current, still can not be inputted with compatible with alternating and direct current inputs
Leakage protection circuit.
Summary of the invention
The object of the present invention is to provide a kind of leakage protection circuit, guard method and using its lighting circuit, for solving
The technical issues of incompatible direct current of load input terminal certainly of the existing technology inputs, to promote the application model of leakage protection circuit
It encloses.
To achieve the above object, the present invention provides a kind of leakage protection circuits, when input voltage is DC voltage, control
Load switch conducting or control load processed are enabled；When input voltage is alternating voltage, judge whether load input terminal leaks electricity,
If load input terminal leaks electricity, controls load switch shutdown or control load does not enable；If load input terminal leakproof, is controlled
Load switch conducting or control load processed are enabled.
Optionally, the leakage protection circuit includes logic circuit, DC detection circuit and electric-leakage detection circuit, described straight
Current detection circuit and the electric-leakage detection circuit receive the sampled signal of input voltage or adopting after input voltage rectification respectively
The output end of sample signal, the output end of the DC detection circuit and the electric-leakage detection circuit is separately connected the two of logic circuit
A input terminal, the logic circuit output control signal；
When the input voltage is DC voltage, the control signal control load switch conducting or control load make
Energy；
When the input voltage is alternating voltage, if load input terminal leakproof, the control signal control load
Switch conduction or control load are enabled；If load input terminal leaks electricity, the control signal control load switch shutdown or control
System load does not enable.
Optionally, if whithin a period of time, the DC detection circuit detects that the sampled signal is less than first threshold,
Then show that input voltage is alternating voltage, otherwise, shows that input voltage is DC voltage.
Optionally, when the peak value of the alternating voltage is greater than the DC voltage, if whithin a period of time, the direct current
Detection circuit detects that the sampled signal is greater than second threshold, then shows that input voltage is otherwise alternating voltage shows to input
Voltage is DC voltage；When the peak value of the alternating voltage is less than the DC voltage, if whithin a period of time, the direct current
Detection circuit detects that the sampled signal is greater than third threshold value, then shows that input voltage is otherwise DC voltage shows to input
Voltage is alternating voltage.
Optionally, the DC detection circuit receives the sampled signal of input voltage, input voltage change rate is detected, if institute
Input voltage change rate is stated greater than the 4th threshold value, then shows that input voltage is alternating voltage；If the input voltage change rate is small
In the 4th threshold value, then show that input voltage is DC voltage.
Optionally, the DC detection circuit includes first capacitor, first resistor and comparison circuit, the first capacitor
One end receives the sampled signal of the input voltage, and the first capacitor second end connects first resistor first end, and described first
The first input end of resistance second end ground connection, the comparison circuit connects the first resistor first end, the comparison circuit
Second input terminal receives the 4th threshold value, and the comparison circuit output signal is as the DC detection circuit output signal；If institute
It states voltage in first resistor and is greater than the 4th threshold value, then show that input voltage is alternating voltage；If voltage is small in the first resistor
In the 4th threshold value, then show that input voltage is DC voltage.
Optionally, the electric-leakage detection circuit includes current detection module and first comparator, the first comparator
One input terminal receives the sampled signal of input voltage, and the second input terminal of the first comparator receives the 5th threshold value, and described the
One comparator exports the first comparison signal；The first end of the current detection module connects the height of rectification circuit by second resistance
Wherein one end of current potential output end or input power, the low potential of the second end connection rectification circuit of the current detection module
The control terminal of output end, the current detection module receives first comparison signal；When the sampled signal of the input voltage
When reaching five threshold values, the electric current that the current detection module detection flows through second resistance obtains current detection signal, when described
When current detection signal is lower than six threshold values, judge that load input terminal leaks electricity.
Optionally, the current detection module includes first switch tube and the second comparator, the first switch tube first
End connects wherein one end of rectification circuit high-potential output end or alternating current input power supplying, the first switch by second resistance
Pipe second end connects rectification circuit low potential output end by 3rd resistor；The second comparator first input end connection first
Switching tube second end, the second comparator second end receive the 6th threshold value, and the first switch tube second end voltage is described
Current detection signal, output signal of second comparator output signal as the electric-leakage detection circuit；First ratio
The first switch tube on-off, when the sampled signal of the input voltage reaches five threshold values, described first are controlled compared with signal
Comparison signal controls the first switch tube conducting.
The present invention also provides a kind of illumination driving circuits, including any one above-described leakage protection circuit, rectification
Circuit, the rectification circuit receives input power, and rectifies to exchange input；The leakage protection circuit detection load is defeated
Enter whether end needs to carry out earth leakage protective；When input voltage is DC voltage or load input terminal leakproof, described in control
Load switch conducting or control load are enabled.
The present invention also provides a kind of earth leakage protecting methods, when input voltage is DC voltage, control load switch conducting
Or control load is enabled；When input voltage is alternating voltage, judge whether load input terminal leaks electricity, if load input terminal leaks
Electricity, then control load switch shutdown or control load does not enable；If load input terminal leakproof, load switch conducting is controlled
Or control load is enabled.
Compared with prior art, the invention has the following advantages that controlling load switch when input voltage is DC voltage
Conducting or control load are enabled；When input voltage is alternating voltage, judge whether load input terminal leaks electricity, if load input
End electric leakage, then control load switch shutdown or control load does not enable；If load input terminal leakproof, controls load switch
Conducting or control load are enabled.The present invention can be inputted with compatible direct current, and can play leakage protection, promoted load and torn open
Safety during dress.
Detailed description of the invention
Fig. 1 is leakage protection circuit schematic diagram of the present invention；
Fig. 2 is a kind of working waveform figure of embodiment of DC detection circuit of the present invention；
Fig. 3 is the schematic diagram of DC detection circuit another kind embodiment of the present invention；
Fig. 4 is electric-leakage detection circuit schematic diagram of the present invention；
Specific embodiment
The preferred embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention is not restricted to these
Embodiment.The present invention covers any substitution made in the spirit and scope of the present invention, modification, equivalent method and scheme.
In order to make the public have thorough understanding to the present invention, it is described in detail in the following preferred embodiment of the present invention specific
Details, and the present invention can also be understood completely in description without these details for a person skilled in the art.
The present invention is more specifically described by way of example referring to attached drawing in the following passage.It should be noted that attached drawing is adopted
With more simplified form and using non-accurate ratio, to convenient, the lucidly aid illustration embodiment of the present invention the mesh
's.
As shown in Figure 1, illustrating leakage protection circuit schematic diagram of the present invention, lead to after input power or input power rectification
Sampled signal VCS is obtained after crossing divider resistance R00 and R01.Leakage protection circuit includes DC detection circuit U01, detection of electrical leakage
Described in circuit U 02 and logic circuit U03, leakage protection circuit DC detection circuit U01 and electric-leakage detection circuit U02 are received respectively
Sampled signal VCS, the first input end of the DC detection circuit U01 output end connection logic circuit U03, the detection of electrical leakage
02 output end of circuit U connects the second input terminal of logic circuit U03, and the logic circuit U03 output end connects driving circuit U04
Input terminal, the driving circuit output end connect load switch M00 control terminal, the load switch M00 first end connection rectification
The high-potential output end of circuit U 00, the load switch M00 second end connection rectification circuit U00's is on the ground.Work as input power
When for DC voltage, control load switch M00 conducting or control load are enabled；When input power is alternating voltage, judgement
Load input terminal whether there is leaky, when load input terminal be not present leaky when, control load switch M00 conducting or
It is enabled that person controls load.
As shown in Fig. 2, a kind of working waveform figure of embodiment of DC detection circuit of the present invention, if in a period of time 0-t1
The sampled signal VAC is less than first threshold VREF1, then shows that input voltage is alternating voltage, otherwise, input voltage is direct current
Voltage.
When the peak value of alternating voltage is less than the DC voltage, if the sampled signal VC2 in a period of time t1-t2
Greater than second threshold VREF2, then show that input voltage is DC voltage, otherwise, shows that input voltage is alternating voltage；Work as exchange
When the peak value of voltage is greater than the DC voltage, if the sampled signal VAC is greater than third threshold value in a period of time t1-t2
VREF3 then shows that input voltage is alternating voltage, and otherwise, input voltage is DC voltage.The DC detection circuit difference is defeated
The DC detecting signal of corresponding output voltage is characterized out.
As shown in figure 3, illustrating another DC detection circuit schematic diagram of the invention, including first capacitor C1, the first electricity
R1 and comparison circuit U101 is hindered, first capacitor C1 first end receives the sampled signal after input power rectification, second end and the
The connection of one resistance R1 first end, first resistor R1 second end ground connection, comparison circuit U101 first input end connect first capacitor C1
With the public connecting end of first resistor R1, the second input terminal receives the 4th threshold value VREF4, and output end is as DC detecting electricity
The output end of road U01.When voltage is less than the 4th threshold value VREF4 on first resistor R1, the comparison circuit U101 output characterization
The signal of DC voltage；When voltage is greater than the 4th threshold value VREF4 on first resistor R1, the comparison circuit U101 output characterization
The signal of alternating voltage.
As shown in figure 4, illustrating electric-leakage detection circuit schematic diagram of the present invention, including first comparator U201, current detecting
Module U202 and second resistance R2, the first comparator U201 first input end receive the sampled signal VCS of input voltage, institute
The second input terminal for stating first comparator U201 receives first threshold VREF1, and the first comparator U201 output first is compared
Signal；The first end of the current detection module U202 passes through the high-potential output end of second resistance R2 connection rectification circuit U00
Or wherein one end of input power, the low potential of the second end connection rectification circuit U00 of the current detection module U202 are defeated
The control terminal of outlet, the current detection module U202 receives the first comparison signal VC1；When the sampling of the input voltage
When signal VCS reaches the 5th threshold value VREF5, the electric current that the current detection module U202 detection flows through second resistance R2 obtains electricity
Stream detection signal VC2, when the current detection signal VC2 is lower than the 6th threshold value VREF6, decision circuitry there are leaky,
The signal of the electric-leakage detection circuit output characterization electric leakage.The current detection module U202 includes the second comparator U2022, the
One switching tube Q4 and 3rd resistor R3.The first switch tube Q4 first end passes through second resistance R2 connection rectification circuit U00 high
Current potential output end, the first switch tube Q4 second end pass through 3rd resistor R3 connection rectification circuit U00 low potential output end；Institute
The second comparator U2022 first input end connection first switch tube Q4 second end is stated, the second comparator U2022 second is terminated
The 6th threshold value VREF6 is received, the first switch tube Q4 second end voltage is the current detection signal VC2, and described second compares
Output signal of the device U2022 output signal as the electric-leakage detection circuit；The first comparison signal VC1 control described first
Switching tube Q4 on-off, when the sampled signal VCS of the input voltage reaches the 5th threshold value VREF5, first comparison signal
VC1 controls the first switch tube Q4 conducting.
Although embodiment is separately illustrated and is illustrated above, it is related to the common technology in part, in ordinary skill
Personnel apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and the content recorded is not known, then
It can refer to another embodiment on the books.
Embodiments described above does not constitute the restriction to the technical solution protection scope.It is any in above-mentioned implementation
Made modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution within the spirit and principle of mode
Within enclosing.
Claims (10)
1. a kind of leakage protection circuit, it is characterised in that:
When input voltage is DC voltage, the conducting of control load switch or control load are enabled；When input voltage is exchange
When voltage, judge whether load input terminal leaks electricity, if load input terminal leaks electricity, controls load switch shutdown or control load
It does not enable；If load input terminal leakproof, controls load switch conducting or control load is enabled.
2. leakage protection circuit according to claim 1, it is characterised in that: the leakage protection circuit includes logic electricity
Road, DC detection circuit and electric-leakage detection circuit, the DC detection circuit and the electric-leakage detection circuit receive input respectively
Sampled signal after sampled signal or the input voltage rectification of voltage, the output end of the DC detection circuit and the electric leakage
The output end of detection circuit is separately connected two input terminals of logic circuit, the logic circuit output control signal；
When the input voltage is DC voltage, the control signal control load switch conducting or control load are enabled；
When the input voltage is alternating voltage, if load input terminal leakproof, the control signal controls load switch
Conducting or control load are enabled；If load input terminal leaks electricity, the control signal control load switch shutdown or control are negative
Load does not enable.
3. leakage protection circuit according to claim 2, it is characterised in that: if whithin a period of time, the DC detecting
Circuit detects that the sampled signal is less than first threshold, then shows that input voltage is otherwise alternating voltage shows input voltage
For DC voltage.
4. leakage protection circuit according to claim 2, it is characterised in that: described in being greater than when the peak value of the alternating voltage
When DC voltage, if whithin a period of time, the DC detection circuit detects that the sampled signal is greater than second threshold, then table
Bright input voltage is alternating voltage, otherwise, shows that input voltage is DC voltage；Described in being less than when the peak value of the alternating voltage
When DC voltage, if whithin a period of time, the DC detection circuit detects that the sampled signal is greater than third threshold value, then table
Bright input voltage is DC voltage, otherwise, shows that input voltage is alternating voltage.
5. leakage protection circuit according to claim 2, it is characterised in that: the DC detection circuit receives input voltage
Sampled signal, detect input voltage change rate, if the input voltage change rate be greater than the 4th threshold value, show input voltage
For alternating voltage；If the input voltage change rate less than the 4th threshold value, shows that input voltage is DC voltage.
6. leakage protection circuit according to claim 5, it is characterised in that: the DC detection circuit includes the first electricity
Hold, first resistor and comparison circuit, the first capacitor first end receive the sampled signal of the input voltage, first electricity
Hold second end and connect first resistor first end, the first resistor second end ground connection, the first input end of the comparison circuit connects
The first resistor first end is connect, the second input terminal of the comparison circuit receives the 4th threshold value, the comparison circuit output letter
Number be used as the DC detection circuit output signal；If voltage is greater than the 4th threshold value in the first resistor, show input electricity
Pressure is alternating voltage；If voltage is less than the 4th threshold value in the first resistor, show that input voltage is DC voltage.
7. according to any leakage protection circuit described in claim 2,3,4,5 or 6, it is characterised in that: the detection of electrical leakage
Circuit includes current detection module and first comparator, and the first comparator first input end receives the sampling letter of input voltage
Number, the second input terminal of the first comparator receives the 5th threshold value, and the first comparator exports the first comparison signal；It is described
The first end of current detection module by second resistance connect rectification circuit high-potential output end or input power wherein
One end, the low potential output end of the second end connection rectification circuit of the current detection module, the control of the current detection module
End processed receives first comparison signal；When the sampled signal of the input voltage reaches five threshold values, the current detecting
The electric current that module detection flows through second resistance obtains current detection signal, when the current detection signal is lower than six threshold values,
Judge that load input terminal leaks electricity.
8. leakage protection circuit according to claim 7, it is characterised in that: the current detection module includes first switch
Pipe and the second comparator, the first switch tube first end pass through second resistance connection rectification circuit high-potential output end or defeated
Enter wherein one end of power supply, the first switch tube second end connects rectification circuit low potential output end by 3rd resistor；Institute
The second comparator first input end connection first switch tube second end is stated, the second comparator second end receives the 6th threshold value,
The first switch tube second end voltage is the current detection signal, and second comparator output signal is as the electric leakage
The output signal of detection circuit；First comparison signal controls the first switch tube on-off, when adopting for the input voltage
When sample signal reaches five threshold values, first comparison signal controls the first switch tube conducting.
9. a kind of illumination driving circuit, it is characterised in that: including any one leakage protection circuit described in claim 1-8,
Rectification circuit, the rectification circuit receives input power, and rectifies to exchange input；The leakage protection circuit detection is negative
Carry whether input terminal needs to carry out earth leakage protective；When input voltage is DC voltage or load input terminal leakproof, control
The load switch conducting or control load are enabled.
10. a kind of earth leakage protecting method, it is characterised in that: when input voltage be DC voltage when, control load switch conducting or
It is enabled that person controls load；When input voltage is alternating voltage, judge whether load input terminal leaks electricity, if load input terminal leaks
Electricity, then control load switch shutdown or control load does not enable；If load input terminal leakproof, load switch conducting is controlled
Or control load is enabled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910853375.5A CN110535095A (en) | 2019-09-10 | 2019-09-10 | Leakage protection circuit, guard method and the lighting circuit using it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910853375.5A CN110535095A (en) | 2019-09-10 | 2019-09-10 | Leakage protection circuit, guard method and the lighting circuit using it |
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| Publication Number | Publication Date |
|---|---|
| CN110535095A true CN110535095A (en) | 2019-12-03 |
Family
ID=68667963
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910853375.5A Pending CN110535095A (en) | 2019-09-10 | 2019-09-10 | Leakage protection circuit, guard method and the lighting circuit using it |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111987692A (en) * | 2020-07-28 | 2020-11-24 | 杭州士兰微电子股份有限公司 | Leakage protection circuit, control method thereof and drive circuit |
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| CN106684809A (en) * | 2017-02-17 | 2017-05-17 | 杰华特微电子（杭州）有限公司 | Protective circuit and illumination driving circuit |
| CN107809104A (en) * | 2017-12-01 | 2018-03-16 | 上海晶丰明源半导体股份有限公司 | Leakage protection circuit, method and the drive device being applicable |
| CN109474063A (en) * | 2017-09-07 | 2019-03-15 | 上海明石光电科技有限公司 | AC network power supply system and its status monitoring circuit, electrical equipment |
| CN109709440A (en) * | 2018-12-27 | 2019-05-03 | 泉芯电子技术(深圳)有限公司 | Earth leakage protection detection circuit and its control method |
| CN210577748U (en) * | 2019-09-10 | 2020-05-19 | 杰华特微电子（杭州）有限公司 | Leakage protection circuit and lighting circuit using same |
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2019
- 2019-09-10 CN CN201910853375.5A patent/CN110535095A/en active Pending
Patent Citations (5)
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| CN106684809A (en) * | 2017-02-17 | 2017-05-17 | 杰华特微电子（杭州）有限公司 | Protective circuit and illumination driving circuit |
| CN109474063A (en) * | 2017-09-07 | 2019-03-15 | 上海明石光电科技有限公司 | AC network power supply system and its status monitoring circuit, electrical equipment |
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| CN109709440A (en) * | 2018-12-27 | 2019-05-03 | 泉芯电子技术(深圳)有限公司 | Earth leakage protection detection circuit and its control method |
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| CN111987692A (en) * | 2020-07-28 | 2020-11-24 | 杭州士兰微电子股份有限公司 | Leakage protection circuit, control method thereof and drive circuit |
| CN111987692B (en) * | 2020-07-28 | 2023-03-24 | 杭州士兰微电子股份有限公司 | Leakage protection circuit, control method thereof and driving circuit |
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Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Applicant after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Applicant before: JOULWATT TECHNOLOGY Inc.,Ltd. |