CN104768299A - Output short circuit protection type constant-current power supply - Google Patents
Output short circuit protection type constant-current power supply Download PDFInfo
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- CN104768299A CN104768299A CN201510170367.2A CN201510170367A CN104768299A CN 104768299 A CN104768299 A CN 104768299A CN 201510170367 A CN201510170367 A CN 201510170367A CN 104768299 A CN104768299 A CN 104768299A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention discloses an output short circuit protection type constant-current power supply which comprises an output circuit and a voltage-stabilization constant-current circuit. An output short circuit protection circuit is coupled between the output circuit and a load and used for detecting the voltage output by the output circuit. When a short circuit happens to the load, the short-circuit load is cut off. When the circuit works normally, the potential of the OUT+ end is high, and is added to the base electrode of a triode Q7 through voltage division of a resistor R34 and a resistor R35, and the triode Q7 is in saturation conduction. A coil of a relay K1 is powered on, and a normally open contact (3) and a normally open contact (4) are closed. Current is output normally. When a short circuit happens, the potential of the OUT+ end drops rapidly, the potential of the base electrode of the triode Q7 drops rapidly, the triode Q7 is cut off, the coil of the relay K1 is powered off, and the normally open contact (3) and the normally open contact (4) are switched off, the short circuit current is cut off, the aim of cutting off the output current in time is achieved, flexibility is high, and the response speed is high.
Description
Technical field
The present invention relates to a kind of power circuit, specifically, relate to a kind of output short circuit protection type constant-current supply being applicable to LED illumination lamp power supply, belong to electronic technology field.
Background technology
At present, traditional LED power circuit comprises power circuit 1, output circuit 2, amplifying circuit 4, sample circuit 5, Drive and Control Circuit 6, pressure-stabilizing constant flow circuit 7 and PFC correcting circuit 8.
Realizing in process of the present invention; inventor finds at least there is following problem in prior art: although the most chip of current circuit has short-circuit protection function; but when output short-circuit; just quit work; and differ and respond in time surely, and output capacitor capacity is more, has comparatively multi-charge; very large short circuit current can be produced, burn out circuit.
Summary of the invention
The technical problem to be solved in the present invention is for above deficiency, provides a kind of output short circuit protection type constant-current supply, after adopting this output short circuit protection circuit, can realize the object cutting off output current in time, highly sensitive, fast response time.
For solving above technical problem, the present invention by the following technical solutions: a kind of output short circuit protection type constant-current supply, comprises output circuit, pressure-stabilizing constant flow circuit, it is characterized in that: described constant-current supply provides:
One output short circuit protection circuit, is coupled between output circuit and load, be used for detect output circuit export voltage, when load is short-circuited, short circuit load is cut off.
A kind of prioritization scheme; described output short circuit protection circuit comprises diode D9, inspection leakage resistance R4, resistance R33, resistance R34, resistance R35, relay K 1, triode Q7, diode D14; the negative pole of diode D9 connects output circuit, and the positive pole of diode D9 connects pressure-stabilizing constant flow circuit.
Further, described resistance R4 is in parallel with diode D9, a termination output circuit of resistance R33, the negative pole of another terminating diode D14 of resistance R33, one end of relay K 1 coil;
The collector electrode of another termination triode Q7 of described relay K 1 coil, the positive pole of diode D14, the grounded emitter of triode Q7;
One end of base stage connecting resistance R34 of described triode Q7, one end of resistance R35, the other end ground connection of resistance R35.
Further, another termination output circuit of described resistance R34, the positive pole of a terminating diode D9 of relay K 1 normally open contact, another termination LED illumination lamp of relay K 1 normally open contact.
Further, described output circuit comprises resistance R3, diode D7, diode D8, electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9, the positive pole of one terminating diode D7 of secondary coil, one end of resistance R3, one end of another termination capacitor C6 of resistance R3, the negative pole of another terminating diode D7 of electric capacity C6, one end of electric capacity C7, one end of electric capacity C8, pressure-stabilizing constant flow circuit and LED illumination lamp, the other end of electric capacity C7, the centre tap of another termination secondary coil of electric capacity C8, one end of electric capacity C9, the negative pole of another terminating diode D8 of electric capacity C9, pressure-stabilizing constant flow circuit, the positive pole of diode D8 connects the other end of secondary coil.
Further, described pressure-stabilizing constant flow circuit comprises operational amplifier U3, resistance R24, resistance R25, resistance R26, resistance R27, resistance R28, resistance R29, resistance R30, resistance R31, resistance R32, electric capacity C16, electric capacity C17, electric capacity C18, electric capacity C19, diode D12, the model of diode D13 and photo resistance R-G, operational amplifier U3 is AP4310, and 1 pin of operational amplifier U3 connects the negative pole of diode D12, one end of resistance R26, the positive pole of diode D12 connects 2 pin of photoelectrical coupler U2, the positive pole of diode D13, the negative pole of diode D13 connects 7 pin of operational amplifier U3, one end of resistance R30, one end of another termination capacitor C19 of resistance R30,6 pin of another termination operational amplifier U3 of electric capacity C19, one end of resistance R31, the positive pole of diode D9 in another termination output short circuit protection circuit of resistance R31, one end of another termination capacitor C16 of resistance R26, one end of the other end connecting resistance R24 of electric capacity C16, one end of resistance R25, the positive pole of another termination capacitor C8 of resistance R24, the other end ground connection of resistance R25, one end of the 2 pin connecting resistance R27 of operational amplifier U3, one end of resistance R28, one end of electric capacity C18, one end of another termination capacitor C17 of resistance R27, 8 pin of operational amplifier U3, one end of resistance R32, the negative pole of diode D8, the other end ground connection of electric capacity C17,1 pin of another termination photoelectrical coupler U2 of resistance R32,5 pin of another termination operational amplifier U3 of resistance R28, one end of photo resistance R-G, another termination of photo resistance R-G through resistance R29 ground connection, the other end ground connection of electric capacity C18.
After the present invention adopts above technical scheme, compared with prior art, have the following advantages: when circuit normally works, OUT+ terminal potential is higher, is added to triode Q7 base stage, makes triode Q7 saturation conduction through resistance R34, resistance R35 dividing potential drop.Relay K 1 coil obtains electric, and normally open contact 3,4 closes.Electric current normally exports.When a short circuit occurs, OUT+ terminal potential declines rapidly, and triode Q7 base potential declines rapidly, and triode Q7 ends, relay K 1 coil blackout, normally open contact 3,4 disconnects, and short circuit current is disconnected, realize the object cutting off output current in time, highly sensitive, fast response time.
After tested, constant-current supply of the present invention carries out test of many times success rate and reaches 100% when overheated, can cut off power supply in time, not cause power circuit to burn out; Common LED constant current power supply product under identical condition, carries out success of the test rate and is only 75%, and the phenomenon having power circuit to burn out occurs; And the sensitivity of product of the present invention is very high, there is no unsuccessful test, prove that response speed is very fast.
Below in conjunction with drawings and Examples, the present invention is described in detail.
Accompanying drawing explanation
Accompanying drawing 1 is the circuit block diagram of constant-current supply in the embodiment of the present invention;
Accompanying drawing 2 is circuit diagrams of constant-current supply in the embodiment of the present invention;
Accompanying drawing 3 is circuit diagrams of pressure-stabilizing constant flow circuit in the embodiment of the present invention;
In figure,
1-power circuit, 2-output circuit, 3-LED illuminating lamp, 4-amplifying circuit, 5-sample circuit, 6-Drive and Control Circuit, 7-pressure-stabilizing constant flow circuit, 8-PFC correcting circuit, 9-output short circuit protection circuit.
Embodiment
Embodiment; as shown in Figure 1, Figure 2, Figure 3 shows; a kind of output short circuit protection type constant-current supply, power circuit comprises the power circuit 1, output circuit 2, amplifying circuit 4, sample circuit 5, Drive and Control Circuit 6, pressure-stabilizing constant flow circuit 7, PFC correcting circuit 8 and the output short circuit protection circuit 9 that couple.
Power circuit 1 comprises diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, resistance R1, resistance R2, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C5 and switch transformer T, diode D1, diode D2, diode D3, the rectifier bridge that diode D4 forms, switch transformer T has the first primary coil, second primary coil and secondary coil, electric capacity C3 is connected between the positive pole of rectifier bridge and ground, the positive pole of a termination rectifier bridge of resistance R1, one end of another termination capacitor C4 of resistance R1, the negative pole of diode D5, the other end ground connection of electric capacity C4, the positive pole of diode D5 connects one end of the first primary coil, the other end ground connection of the first primary coil, one end of electric capacity C5, the positive pole of the one termination rectifier bridge of resistance R2, the other end of electric capacity C5, the negative pole of another terminating diode D6 of resistance R2, the positive pole of a termination rectifier bridge of the second primary coil, the positive pole of another terminating diode D6 of the second primary coil, electric capacity C5, resistance R2 and diode D6 forms surge absorbing circuit, and secondary coil connects output circuit 2.
Output circuit 2 comprises resistance R3, diode D7, diode D8, electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9, the positive pole of one terminating diode D7 of secondary coil, one end of resistance R3, one end of another termination capacitor C6 of resistance R3, the negative pole of another terminating diode D7 of electric capacity C6, one end of electric capacity C7, one end of electric capacity C8, pressure-stabilizing constant flow circuit 7 and LED illumination lamp 3, the other end of electric capacity C7, the centre tap of another termination secondary coil of electric capacity C8, one end of electric capacity C9, the negative pole of another terminating diode D8 of electric capacity C9, pressure-stabilizing constant flow circuit 7, the positive pole of diode D8 connects the other end of secondary coil, resistance R3, electric capacity C6 is used for abating the noise.
Resistance R8, resistance R9, resistance R10, resistance R11, electric capacity C11 and triode Q3, triode Q4 form amplifying circuit 4, and the input of amplifying circuit 4 connects sample circuit 5, the output termination Drive and Control Circuit 6 of amplifying circuit 4.
Sample circuit 5 comprises photoelectrical coupler U2, exports termination amplifying circuit 4, Drive and Control Circuit 6.Positive pole, the negative pole of photoelectrical coupler U2 connect pressure-stabilizing constant flow circuit 7 respectively, and the magnitude of voltage of pressure-stabilizing constant flow circuit 7 is carried out voltage sampling.
Drive and Control Circuit 6 comprises driving chip U1, resistance R7, resistance R12, electric capacity C10, diode D10, diode D11, resistance R13, resistance R14, current-limiting resistance R15, the model of field effect transistor Q1, driving chip U1 is SA7527, one end of the 1 pin connecting resistance R7 of driving chip U1, one end of resistance R12, one end of electric capacity C10, the other end of resistance R12, 2 pin of another termination driving chip U1 of electric capacity C10, the output of amplifying circuit 4, the input of another termination amplifying circuit 4 of resistance R7, the positive pole of diode D10, the emitter of photoelectrical coupler U2, the negative pole of diode D10 connects the collector electrode of photoelectrical coupler U2, 8 pin of driving chip U1,3 pin of driving chip U1 connect PFC correcting circuit 8, and 5 pin of driving chip U1 connect the positive pole of diode D5 in power circuit 1 through resistance R6, the 6 pin ground of driving chip U1, one end of the 7 pin connecting resistance R13 of driving chip U1, the negative pole of diode D11, the other end of resistance R13, the positive pole of diode D11 connects the grid of field effect transistor Q1, the source electrode of field effect transistor Q1 is through current-limiting resistance R15 ground connection, resistance R14 is connected between the grid of field effect transistor Q1 and the source electrode of field effect transistor Q1, the drain electrode of field effect transistor Q1 connects the positive pole of diode D6 in power circuit 1,4 pin of driving chip U1 connect the source electrode of field effect transistor Q1, and 8 pin of driving chip U1 connect the negative pole of diode D5 in power circuit 1 through resistance R5.
Pressure-stabilizing constant flow circuit 7 comprises operational amplifier U3, resistance R24, resistance R25, resistance R26, resistance R27, resistance R28, resistance R29, resistance R30, resistance R31, resistance R32, electric capacity C16, electric capacity C17, electric capacity C18, electric capacity C19, diode D12, diode D13 and photo resistance R-G, the model of operational amplifier U3 is AP4310, 1 pin of operational amplifier U3 is operational amplifier 1 signal output part, 2 pin are operational amplifier 1 inversion signal input, 3 pin are operational amplifier 1 in-phase signal input, 4 pin are earth terminal, 5 pin are operational amplifier 2 in-phase signal input, 6 pin are operational amplifier 2 inversion signal input, 7 pin are operational amplifier 2 signal output part, 8 pin are power end.1 pin of operational amplifier U3 connects the negative pole of diode D12, one end of resistance R26, the positive pole of diode D12 connects 2 pin of photoelectrical coupler U2, the positive pole of diode D13, the negative pole of diode D13 connects 7 pin of operational amplifier U3, one end of resistance R30, one end of another termination capacitor C19 of resistance R30, 6 pin of another termination operational amplifier U3 of electric capacity C19, one end of resistance R31, the positive pole of diode D9 in another termination output short circuit protection circuit 9 of resistance R31, one end of another termination capacitor C16 of resistance R26, one end of the other end connecting resistance R24 of electric capacity C16, one end of resistance R25, the positive pole of another termination capacitor C8 of resistance R24, the other end ground connection of resistance R25, one end of the 2 pin connecting resistance R27 of operational amplifier U3, one end of resistance R28, one end of electric capacity C18, one end of another termination capacitor C17 of resistance R27, 8 pin of operational amplifier U3, one end of resistance R32, the negative pole of diode D8, the other end ground connection of electric capacity C17, 1 pin of another termination photoelectrical coupler U2 of resistance R32, 5 pin of another termination operational amplifier U3 of resistance R28, one end of photo resistance R-G, another termination of photo resistance R-G is through resistance R29 ground connection, the other end ground connection of electric capacity C18.
PFC correcting circuit 8 comprises resistance R16, resistance R17, resistance R18, resistance R19, resistance R20, resistance R21, resistance R22, resistance R23, electric capacity C13, electric capacity C14, triode Q5 and triode Q6, one end of resistance R16, one end of resistance R2 in the one termination power circuit 1 of resistance R17, the other end of resistance R16 is through one end of resistance R18 connecting resistance R20, the collector electrode of triode Q5, the other end ground connection of resistance R20, the base stage of triode Q5 is unsettled, the emitter of triode Q5 connects the base stage of triode Q6 through resistance R23, one end of electric capacity C13, the other end ground connection of electric capacity C13, the grounded emitter of triode Q6, triode Q6 collector electrode is through one end of resistance R22 connecting resistance R19, one end of resistance R21, one end of electric capacity C14 and 3 pin of driving chip U1, the other end ground connection of resistance R21, the other end of the other end connecting resistance R17 of resistance R19, the other end ground connection of electric capacity C14.
Output short circuit protection circuit 9 comprises diode D9, inspection leakage resistance R4, resistance R33, resistance R34, resistance R35, relay K 1, triode Q7, diode D14, the negative pole of diode D9 connects the one end of electric capacity C9 in output circuit 2, the positive pole of diode D9 connects the other end of resistance R31 in pressure-stabilizing constant flow circuit 7, resistance R4 is in parallel with diode D9, the other end of electric capacity C9 in the one termination output circuit 2 of resistance R33, the negative pole of another terminating diode D14 of resistance R33, one end of relay K 1 coil, the collector electrode of another termination triode Q7 of relay K 1 coil, the positive pole of diode D14, the grounded emitter of triode Q7, one end of the base stage connecting resistance R34 of triode Q7, one end of resistance R35, the other end ground connection of resistance R35, the positive pole of electric capacity C8 in another termination output circuit 2 of resistance R34, the positive pole of one terminating diode D9 of relay K 1 normally open contact, another termination LED illumination lamp 3 of relay K 1 normally open contact.
When output is short-circuited suddenly, the short-circuit protection of circuit self just makes switching circuit quit work, and output filter capacitor still has more electric charge meeting abrupt release, forms larger short circuit current.Now inspection leakage resistance R4 is the unique load in loop, and first resistance R4 can burn out by short circuit current.At resistance R4 two ends parallel diode D9, make the pressure drop of short circuit current on resistance R4 can not higher than 0.7V.Thus protective resistance R4.
When circuit normally works, OUT+ terminal potential is higher, is added to triode Q7 base stage, makes triode Q7 saturation conduction through resistance R34, resistance R35 dividing potential drop.Relay K 1 coil obtains electric, and normally open contact 3,4 closes.Electric current normally exports.When a short circuit occurs, OUT+ terminal potential declines rapidly, and triode Q7 base potential declines rapidly, and triode Q7 ends, relay K 1 coil blackout, and normally open contact 3,4 disconnects, and short circuit current is disconnected.Thus play short-circuit protection effect, and highly sensitive, fast response time.
In above embodiment, power circuit 1, output circuit 2, amplifying circuit 4, sample circuit 5, Drive and Control Circuit 6, pressure-stabilizing constant flow circuit 7, PFC correcting circuit 8 can be other custom circuit, as long as can realize its function.
Those skilled in the art will recognize that; above-mentioned embodiment is exemplary; to enable those skilled in the art better understand content of the present invention; should not be understood as limiting the scope of the invention; as long as according to the improvement that technical solution of the present invention is done, all fall into protection scope of the present invention.
Claims (7)
1. an output short circuit protection type constant-current supply, is characterized in that: comprise the output circuit (2) of electrical connection, sample circuit (5), pressure-stabilizing constant flow circuit (7), described constant-current supply also provides:
Output short circuit protection circuit (9), is coupled between output circuit (2) and load, is used for detecting output circuit (2) voltage that exports, when load is short-circuited, is cut off by short circuit load.
2. constant-current supply as claimed in claim 1; it is characterized in that: described output short circuit protection circuit (9) comprises diode D9, inspection leakage resistance R4, resistance R33, resistance R34, resistance R35, relay K 1, triode Q7, diode D14; the negative pole of diode D9 connects output circuit (2), and the positive pole of diode D9 connects pressure-stabilizing constant flow circuit (7).
3. constant-current supply as claimed in claim 2, is characterized in that: described resistance R4 is in parallel with diode D9, a termination output circuit (2) of resistance R33, the negative pole of another terminating diode D14 of resistance R33, one end of relay K 1 coil;
The collector electrode of another termination triode Q7 of described relay K 1 coil, the positive pole of diode D14, the grounded emitter of triode Q7;
One end of base stage connecting resistance R34 of described triode Q7, one end of resistance R35, the other end ground connection of resistance R35.
4. constant-current supply as claimed in claim 3, it is characterized in that: another termination output circuit (2) of described resistance R34, the positive pole of one terminating diode D9 of relay K 1 normally open contact, another termination LED illumination lamp (3) of relay K 1 normally open contact.
5. constant-current supply as claimed in claim 4, it is characterized in that: described output circuit (2) comprises resistance R3, diode D7, diode D8, electric capacity C6, electric capacity C7, electric capacity C8, electric capacity C9, the positive pole of one terminating diode D7 of secondary coil, one end of resistance R3, one end of another termination capacitor C6 of resistance R3, the negative pole of another terminating diode D7 of electric capacity C6, one end of electric capacity C7, one end of electric capacity C8, pressure-stabilizing constant flow circuit (7) and LED illumination lamp (3), the other end of electric capacity C7, the centre tap of another termination secondary coil of electric capacity C8, one end of electric capacity C9, the negative pole of another terminating diode D8 of electric capacity C9, pressure-stabilizing constant flow circuit (7), the positive pole of diode D8 connects the other end of secondary coil.
6. constant-current supply as claimed in claim 5, is characterized in that: described sample circuit (5) is photoelectrical coupler U2.
7. constant-current supply as claimed in claim 6, is characterized in that: described pressure-stabilizing constant flow circuit (7) comprises operational amplifier U3, resistance R24, resistance R25, resistance R26, resistance R27, resistance R28, resistance R29, resistance R30, resistance R31, resistance R32, electric capacity C16, electric capacity C17, electric capacity C18, electric capacity C19, diode D12, the model of diode D13 and photo resistance R-G, operational amplifier U3 is AP4310, and 1 pin of operational amplifier U3 connects the negative pole of diode D12, one end of resistance R26, the positive pole of diode D12 connects 2 pin of photoelectrical coupler U2, the positive pole of diode D13, the negative pole of diode D13 connects 7 pin of operational amplifier U3, one end of resistance R30, one end of another termination capacitor C19 of resistance R30,6 pin of another termination operational amplifier U3 of electric capacity C19, one end of resistance R31, the positive pole of diode D9 in another termination output short circuit protection circuit (9) of resistance R31, one end of another termination capacitor C16 of resistance R26, one end of the other end connecting resistance R24 of electric capacity C16, one end of resistance R25, the positive pole of another termination capacitor C8 of resistance R24, the other end ground connection of resistance R25, one end of the 2 pin connecting resistance R27 of operational amplifier U3, one end of resistance R28, one end of electric capacity C18, one end of another termination capacitor C17 of resistance R27, 8 pin of operational amplifier U3, one end of resistance R32, the negative pole of diode D8, the other end ground connection of electric capacity C17,1 pin of another termination photoelectrical coupler U2 of resistance R32,5 pin of another termination operational amplifier U3 of resistance R28, one end of photo resistance R-G, another termination of photo resistance R-G through resistance R29 ground connection, the other end ground connection of electric capacity C18.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510170367.2A CN104768299B (en) | 2015-04-04 | 2015-04-04 | Output short circuit protection type constant-current power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510170367.2A CN104768299B (en) | 2015-04-04 | 2015-04-04 | Output short circuit protection type constant-current power supply |
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| CN104768299A true CN104768299A (en) | 2015-07-08 |
| CN104768299B CN104768299B (en) | 2017-02-22 |
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| CN201510170367.2A Active CN104768299B (en) | 2015-04-04 | 2015-04-04 | Output short circuit protection type constant-current power supply |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2852598Y (en) * | 2005-11-24 | 2006-12-27 | 林益佳 | Electronic ballast |
| EP1937038A2 (en) * | 2006-12-19 | 2008-06-25 | Advanced Dimming Technology Limited | Power regulator |
| CN202652620U (en) * | 2012-05-23 | 2013-01-02 | 山东彩霆生态照明器材科技有限公司 | Voltage stabilizing constant current circuit for LED drive power supply |
-
2015
- 2015-04-04 CN CN201510170367.2A patent/CN104768299B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2852598Y (en) * | 2005-11-24 | 2006-12-27 | 林益佳 | Electronic ballast |
| EP1937038A2 (en) * | 2006-12-19 | 2008-06-25 | Advanced Dimming Technology Limited | Power regulator |
| CN202652620U (en) * | 2012-05-23 | 2013-01-02 | 山东彩霆生态照明器材科技有限公司 | Voltage stabilizing constant current circuit for LED drive power supply |
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| 像风一样离去10: "《自动恢复短路保护》", 《百度文库》 * |
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Inventor after: Li Jianjun Inventor before: Wei Renjie |
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Effective date of registration: 20171116 Address after: 4 No. 408400 Chongqing City Industrial Park, Nanchuan District DUCAM Avenue Patentee after: Chongqing Xin Nan Wan Yu machinery limited liability company Address before: 261061 Shandong city of Weifang province high tech Zone Baotong Street No. 7857 in Weifang Patentee before: Wei Renjie |
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