CN104617547A - Dual-protection circuit for mine intrinsically safe power supply - Google Patents

Dual-protection circuit for mine intrinsically safe power supply Download PDF

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Publication number
CN104617547A
CN104617547A CN201510082373.2A CN201510082373A CN104617547A CN 104617547 A CN104617547 A CN 104617547A CN 201510082373 A CN201510082373 A CN 201510082373A CN 104617547 A CN104617547 A CN 104617547A
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output
comparator
connects
circuit
input power
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CN201510082373.2A
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CN104617547B (en
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马良柱
张永庆
李润春
李连庆
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SHANDONG MICRO-SENSOR PHOTONICS Ltd
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SHANDONG MICRO-SENSOR PHOTONICS Ltd
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Abstract

The invention discloses a dual-protection circuit for a mine intrinsically safe power supply. The dual-protection circuit for the mine intrinsically safe power supply comprises a first-level protection circuit and a second-level protection circuit. The input end of the first-level protection circuit is connected to the output ends of sampling circuits and the output end of the first-level protection circuit is connected to a first switch. The positive electrode of an input power supply and the positive electrode of the intrinsically safe output are connected through the first switch. The input end of the second-level protection circuit is connected to the output ends of the sampling circuits and the output end of the second-level protection circuit is connected to a second switch. The negative electrode of the intrinsically safe output and the negative electrode of the input power supply are connected through the second switch. The sampling circuits comprise a current sampling circuit and a voltage sampling circuit. The dual-protection circuit for the mine intrinsically safe power supply can cut off output in the case of overcurrent or overvoltage and is simple in structure, low in cost and capable of reaching the turn-off speed up to 1 us and automatically returning to work after the fault is removed.

Description

A kind of mine intrinsic safety electric source dual-protection circuit
Technical field
The present invention relates to intrinsic safety electric source field, particularly relate to a kind of mine intrinsic safety electric source dual-protection circuit.
Background technology
In the explosive gas atmosphere of underground coal mine or petrochemical industry, as in the environment having the explosive mixtures such as methane, gasoline, coal dust, the voltage and current of use to power supply of electric equipment has strict requirement, the size of supply voltage and electric current has extremely important meaning to the normal work of electric equipment and coal mine downhole safety, the safety being directly connected to coal mine operation is carried out, and each electric equipment must operate within the scope of the voltage and current of permission.
The core of mine intrinsic safety electric source is exactly protective circuit; according to relevant criterion; mine intrinsic safety electric source needs to possess dual overcurrent, excess voltage protection; energy automatic recovery of power supply after trouble shooting; the structure that published intrinsic safety electric source protective circuit patent all have employed monostable flipflop and comparator reaches above-mentioned requirements, and this type of protective circuit needs additional lag function and auxiliary power circuit to adapt to the needs of different output voltage grade.
The patent " the safe safe secondary protection circuit of mine power resource " that application number is " CN201110375240.6 " all can be protected under generation overcurrent and superpotential situation; but just turn off intrinsic safety output cathode; do not turn off the negative pole that intrinsic safety exports; once this switch is out of control; just lose the effect of protection, security performance is low.
Summary of the invention
Object of the present invention is exactly to solve the problem; provide a kind of mine intrinsic safety electric source dual-protection circuit; turn off positive pole and the negative pole of intrinsic safety output when overcurrent and any one situation of overvoltage occur all simultaneously; turn-off speed can reach 1us, does not need auxiliary power circuit, does not need monostable flipflop; do not need additional sluggishness; structure is simple, uses flexibly, is applicable to the intrinsic safety electric source protective circuit that 12v, 15v, 18v, 24v etc. are common.
To achieve these goals, the present invention adopts following technical scheme:
A kind of mine intrinsic safety electric source dual-protection circuit, comprising: first order protective circuit and second level protective circuit;
The input of described first order protective circuit connects the output of sample circuit, and the output of described first order protective circuit connects the first switch; Input power positive pole is connected by described first switch with intrinsic safety output cathode;
The input of described second level protective circuit connects the output of sample circuit, and the output of described second level protective circuit connects second switch; Intrinsic safety output negative pole is connected by described second switch with input power negative pole;
Described sample circuit comprises current sampling circuit and voltage sample circuit;
Described current sampling circuit is connected on the line between second switch and input power negative pole, for detecting intrinsic safety electric source output current;
Described voltage sample circuit is connected on the line between input power positive pole and input power negative pole, for detecting intrinsic safety electric source output voltage.
Described first order protective circuit comprises overcurrent detection comparator U1 and Zenith tracking comparator U2;
The input pin of overcurrent detection comparator U1 connects the output of current sampling circuit, and output pin connects the input pin of Zenith tracking comparator U2, and the output of voltage sample circuit connects another input pin of U2;
Input power is powered for overcurrent detection comparator U1 and Zenith tracking comparator U2 simultaneously, overcurrent detection comparator U1 is connected input power positive pole with the power pins of Zenith tracking comparator U2, and the power pins of overcurrent detection comparator U1 and voltage detection comparator U2 is each via ground connection after filter capacitor;
The output pin of overcurrent detection comparator U1 is connected with the input pin of Zenith tracking comparator U2,
The base stage of triode Q1 is connected to after the output pin of Zenith tracking comparator U2 connects together, the collector electrode of triode Q1 is connected with the grid of field effect transistor Q2, the grounded emitter of triode Q1, the collector electrode of triode Q1 is connected to after input power positive pole contact resistance R3, the base stage of triode Q1 is connected to, the grounded emitter of triode Q3 after input power positive pole contact resistance R4;
The source electrode of field effect transistor Q2 connects input power positive pole, and drain electrode connects intrinsic safety and just exporting;
Field effect transistor Q2 is described first switch.
Described second level protective circuit comprises overcurrent detection comparator U3 and Zenith tracking comparator U4;
The input pin of overcurrent detection comparator U3 connects the output of current sampling circuit, and output pin connects the input pin of Zenith tracking comparator U4, and the output of voltage sample circuit connects the input pin of Zenith tracking comparator U4;
Input power is powered for overcurrent detection comparator U3 and Zenith tracking comparator U4 simultaneously, overcurrent detection comparator U3 is connected input power positive pole with the power pins of Zenith tracking comparator U4, and the power pins of overcurrent detection comparator U3 and Zenith tracking comparator U4 is each via ground connection after filter capacitor;
The output pin of overcurrent detection comparator U3 is connected with the input pin of Zenith tracking comparator U4,
Be divided into three branch roads after the output pin of Zenith tracking comparator U4 connects together, connect input electrode positive pole after a branch road contact resistance R5, ground connection after a branch road contact resistance R6, after a branch road contact resistance R11, connect the grid of field effect transistor Q3;
The drain electrode of described field effect transistor Q3 connects intrinsic safety output negative pole;
Field effect transistor Q3 is described second switch.
Described sample circuit is completed by a sample resistance R12, and one end of resistance R12 connects input power negative pole, and the other end connects the source electrode of field effect transistor Q3, and one end that resistance R12 is connected with the source electrode of field effect transistor Q3 is the output of current sampling circuit.
Described voltage sample circuit comprises the resistance R9 and resistance R10 that are connected in series, one end of resistance R9 connects input power positive pole, one end of other end contact resistance R10, the other end of resistance R10 connects input power negative pole, the two ends shunt capacitance C11 of resistance R10, one end that resistance R9 is connected with resistance R10 is the output of voltage sample circuit.
The invention has the beneficial effects as follows:
The present invention all cuts off output under generation overcurrent or superpotential situation, and structure is simple, and cost is low, and turn-off speed can reach 1us, can automatically resume work after trouble shooting.It comprises 4 comparators, two fet switches, and two voltage comparators form monostable flipflop, carry sluggishness and Voltage Reference, do not need additionally to add monostable flipflop and auxiliary power circuit.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present invention;
Fig. 2 is dual-protection circuit figure of the present invention, containing first order protective circuit and second level protective circuit.
Fig. 3 is the shutoff waveform of protective circuit of the present invention.
Wherein, 1. input power positive pole, 2. overcurrent detection comparator U1,3. Zenith tracking comparator U2,4. the first switch, 5. Zenith tracking comparator U4,6. overcurrent detection comparator U3,7. second switch, 8. voltage sample circuit output, 9. current sampling circuit output, 10. input power negative pole, 11. driving voltage waveform representing mosfet switch, 12. represent intrinsic safety output voltage waveforms.
Embodiment:
Below in conjunction with accompanying drawing and embodiment, the present invention will be further described:
As shown in Figure 1-2, a kind of mine intrinsic safety electric source dual-protection circuit, comprising: first order protective circuit (in Fig. 1 overcurrent detection comparator U1 2, Zenith tracking comparator U2 3, first switch 4) and second level protective circuit (in Fig. 1 Zenith tracking comparator U4 5, overcurrent detection comparator U3 6, second switch 7); External input power is powered directly to overcurrent detection comparator U1 2, Zenith tracking comparator U2 3, overcurrent detection comparator U3 6, Zenith tracking comparator U4 5.Overcurrent detection comparator U1 2, Zenith tracking comparator U2 3, Zenith tracking comparator U4 5, overcurrent detection comparator U3 6 are same model, and model is: NCV33161.
The reference of comparator built-in voltage, binary channels band hysteresis voltage comparator.External input power is connected to the source electrode of field effect transistor Q2, the drain electrode of field effect transistor Q2 connects the positive pole of intrinsic safety output, intrinsic safety output negative pole connects the drain electrode of field effect transistor Q3, and current sampling end connects the source electrode of field effect transistor Q3, and the source electrode of field effect transistor Q3 connects input power negative pole 10 by R12.CS connects input voltage negative pole by resistance R12, is current sampling circuit output 9, for detecting output loop electric current.VS connects input power positive pole 1 by resistance R9, and connecting input power negative pole 10 by R10, is voltage sample circuit output 8, for detecting output voltage.
First order protective circuit comprises overcurrent detection comparator U1 2 and Zenith tracking comparator U2 3;
3 pin of overcurrent detection comparator U1 2 connect the output of current sampling circuit, and 5 pins connect 2 pins of Zenith tracking comparator U2 3, and the output of voltage sample circuit connects 3 pins of Zenith tracking comparator U2 3;
1 pin of overcurrent detection comparator U1 2 is connected rear one end connecting electric capacity C2, the other end ground connection of electric capacity C2 with 7 pins; Input power is powered for overcurrent detection comparator U1 2 and Zenith tracking comparator U2 3 simultaneously, overcurrent detection comparator U1 2 is connected input power positive pole with 8 pins of Zenith tracking comparator U2 3, and 8 pins of overcurrent detection comparator U12 and Zenith tracking comparator U2 3 are each via ground connection after filter capacitor C1, C7;
5 pins of overcurrent detection comparator U1 2 are connected with 2 pins of Zenith tracking comparator U2 3, and one end of electric capacity C3 is connected on 5 pins of overcurrent detection comparator U1 2 and the 2 pin lines of Zenith tracking comparator U2 3, other end ground connection; 1 pin of contact resistance R1 between 1 pin of Zenith tracking comparator U2 3 and 2 pins, Zenith tracking comparator U2 3 is connected rear one end connecting electric capacity C8, the other end ground connection of electric capacity C8 with 7 pins;
The base stage of triode Q1 is connected to after the output 5,6 of Zenith tracking comparator U2 3 connects together, the collector electrode of triode Q1 is connected with the grid of field effect transistor Q2, the grounded emitter of triode Q1, the collector electrode of triode Q1 is connected to after input power positive pole contact resistance R3, the base stage of triode Q1 is connected to, the grounded emitter of triode Q3 after input power positive pole contact resistance R4;
The source electrode of field effect transistor Q2 connects input power positive pole, and drain electrode connects intrinsic safety output cathode.
Field effect transistor Q2 had both been the first switch, the object that when reaching overcurrent protection by the series connection of two comparator U1 U2 and the combination of resistance R1 and electric capacity C3, time delay is restarted.
Second level protective circuit comprises overcurrent detection comparator U3 6 and Zenith tracking comparator U4 5;
3 pin of overcurrent detection comparator U3 6 connect the output of current sampling circuit, and 5 pins connect 2 pins of Zenith tracking comparator U4 5, and the output of voltage sample circuit connects 3 pins of Zenith tracking comparator U4 5;
1 pin of overcurrent detection comparator U3 6 is connected rear one end connecting electric capacity C5, the other end ground connection of electric capacity C5 with 7 pins; Input power is powered for overcurrent detection comparator U3 6 and Zenith tracking comparator U4 5 simultaneously, overcurrent detection comparator U3 6 is connected input power positive pole with 8 pins of Zenith tracking comparator U4 5, and 8 pins of overcurrent detection comparator U36 and Zenith tracking comparator U4 5 are each via ground connection after filter capacitor C4, C10;
5 pins of overcurrent detection comparator U3 6 are connected with 2 pins of Zenith tracking comparator U4 5, and one end of electric capacity C2 is connected on 5 pins of overcurrent detection comparator U3 6 and the 2 pin lines of Zenith tracking comparator U4 5, other end ground connection; 1 pin of contact resistance R2 between 1 pin of Zenith tracking comparator U4 5 and 2 pins, Zenith tracking comparator U4 5 is connected rear one end connecting electric capacity C10, the other end ground connection of electric capacity C10 with 7 pins;
Three branch roads are divided into after the output 5,6 of Zenith tracking comparator U4 5 connects together, article one, connect input electrode positive pole after branch road contact resistance R5,, a ground connection after branch road contact resistance R6, connects the grid of field effect transistor Q3 after a branch road contact resistance R11;
The drain electrode of field effect transistor Q3 connects intrinsic safety output negative pole.
Field effect transistor Q3 had both been second switch.
Sample circuit is completed by a sample resistance R12, and one end of resistance R12 connects input power negative pole, and the other end connects the source electrode of field effect transistor Q3, and one end that resistance R12 is connected with the source electrode of field effect transistor Q3 is the output of current sampling circuit.
Voltage sample circuit comprises the resistance R9 and resistance R10 that are connected in series, one end of resistance R9 connects input power positive pole, one end of other end contact resistance R10, the other end of resistance R10 connects input power negative pole, the two ends shunt capacitance C11 of resistance R10, one end that resistance R9 is connected with resistance R10 is the output of voltage sample circuit.
When circuit normally works, namely under there is not overcurrent and superpotential situation, for first order protective circuit, 5 pin of overcurrent detection comparator U1 2 are pulled upward to Voltage Reference by R1, the 2 pin input high levels of Zenith tracking comparator U2, so the 6 pin floatings of Zenith tracking comparator U2 3; The input pin of Zenith tracking comparator U2 3 do not have to be input as in superpotential situation low, so the 5 pin also floating of Zenith tracking comparator U2 3, the base stage of Q1 is pulled upward to input by R4, input is input power positive pole 1, Q1 conducting, the grid voltage of Q2 declines also conducting, and intrinsic safety output cathode is connected with input power positive pole 1.In like manner for second level protective circuit; not there is 5 pin and the 6 pin also floating of Zenith tracking comparator U4 in overcurrent and superpotential situation; now the grid voltage of field effect transistor Q3 is the dividing potential drop of input at R5 and R6; so conducting, intrinsic safety output negative pole is connected with input power negative pole 10 by the drain electrode of Q3, source electrode, R12.
When there is the situation of overcurrent in circuit, the inside triode ON of overcurrent detection comparator U1 2, electric capacity C3 is discharged rapidly by 5 pin of overcurrent detection comparator U1 2, so the 1 channel status upset of Zenith tracking comparator U2 3,6 pin become low level from high level, and now the base voltage of the triode Q1 of first order protective circuit turns off close to 0v, Q1, the grid of field effect transistor Q2 by input pull-up, so have turned off input; For second level protective circuit, when 6 pin having served as voltage detection comparator U4 5 become low level from high level, the grid voltage of field effect transistor Q3, close to 0, so also turn off, is equivalent to positive pole that intrinsic safety is exported and negative pole turns off simultaneously like this.For first order protective circuit after shutoff; 1 pin of Zenith tracking comparator U2 3 is charged to C3 by R1; when being charged to 1.27v; the 6 pin voltage upsets of Zenith tracking comparator U2 3; the base stage of Q1 is high level conducting by R4 pull-up; the grid voltage of Q2 declines also conducting; for second level protective circuit; 1 pin of Zenith tracking comparator U4 5 is charged to C6 by R2; when being charged to 1.27v, the 6 feet states of Zenith tracking comparator U4 5 become high level; so Q3 is conducting also, so circulation is gone down.
When there is superpotential situation in circuit, for first order protective circuit, the 1 channel status upset of Zenith tracking comparator U2 3,6 pin become low level from high level, now the base voltage of the triode Q1 of first order protective circuit is close to 0v, Q1 turn off, the grid of field effect transistor Q2 by input pull-up, so have turned off input; For second level protective circuit, when 6 pin having served as voltage detection comparator U4 5 become low level from high level, the grid voltage of field effect transistor Q3, close to 0, so also turn off, is equivalent to positive pole that intrinsic safety is exported and negative pole turns off simultaneously like this.Different from during generation overcurrent protection, Q2 and Q3 that protective circuit during overvoltage protection occurs turns off, until could remove under voltage drop to a certain voltage simultaneously.
As shown in Figure 3,11 driving voltages representing mosfet switch, ch2 represents intrinsic safety output voltage waveforms 18V, at transcient short circuit time, 18v declines rapidly, and the driving voltage of mosfet also turns off, and thinks that circuit completes shutoff when mosfet driving voltage reduces to about 1v, due to horizontal resolution 1us, namely the turn-off time is 1us.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.

Claims (5)

1. a mine intrinsic safety electric source dual-protection circuit, is characterized in that, comprising: first order protective circuit and second level protective circuit;
The input of described first order protective circuit connects the output of sample circuit, and the output of described first order protective circuit connects the first switch; Input power positive pole is connected by described first switch with intrinsic safety output cathode;
The input of described second level protective circuit connects the output of sample circuit, and the output of described second level protective circuit connects second switch; Intrinsic safety output negative pole is connected by described second switch with input power negative pole;
Described sample circuit comprises current sampling circuit and voltage sample circuit;
Described current sampling circuit is connected on the line between second switch and input power negative pole, for detecting intrinsic safety electric source output current;
Described voltage sample circuit is connected on the line between input power positive pole and input power negative pole, for detecting intrinsic safety electric source output voltage.
2. a kind of mine intrinsic safety electric source dual-protection circuit as claimed in claim 1, is characterized in that, described first order protective circuit comprises overcurrent detection comparator U1 and Zenith tracking comparator U2;
The input pin of overcurrent detection comparator U1 connects the output of current sampling circuit, and output pin connects the input pin of Zenith tracking comparator U2, and the output of voltage sample circuit connects another input pin of U2;
Input power is powered for overcurrent detection comparator U1 and Zenith tracking comparator U2 simultaneously, overcurrent detection comparator U1 is connected input power positive pole with the power pins of Zenith tracking comparator U2, and the power pins of overcurrent detection comparator U1 and voltage detection comparator U2 is each via ground connection after filter capacitor;
The output pin of overcurrent detection comparator U1 is connected with the input pin of Zenith tracking comparator U2,
The base stage of triode Q1 is connected to after the output pin of Zenith tracking comparator U2 connects together, the collector electrode of triode Q1 is connected with the grid of field effect transistor Q2, the grounded emitter of triode Q1, the collector electrode of triode Q1 is connected to after input power positive pole contact resistance R3, the base stage of triode Q1 is connected to, the grounded emitter of triode Q3 after input power positive pole contact resistance R4;
The source electrode of field effect transistor Q2 connects input power positive pole, and drain electrode connects intrinsic safety and just exporting;
Field effect transistor Q2 is described first switch.
3. a kind of mine intrinsic safety electric source dual-protection circuit as claimed in claim 1, is characterized in that, described second level protective circuit comprises overcurrent detection comparator U3 and Zenith tracking comparator U4;
The input pin of overcurrent detection comparator U3 connects the output of current sampling circuit, and output pin connects the input pin of Zenith tracking comparator U4, and the output of voltage sample circuit connects the input pin of Zenith tracking comparator U4;
Input power is powered for overcurrent detection comparator U3 and Zenith tracking comparator U4 simultaneously, overcurrent detection comparator U3 is connected input power positive pole with the power pins of Zenith tracking comparator U4, and the power pins of overcurrent detection comparator U3 and Zenith tracking comparator U4 is each via ground connection after filter capacitor;
The output pin of overcurrent detection comparator U3 is connected with the input pin of Zenith tracking comparator U4,
Be divided into three branch roads after the output pin of Zenith tracking comparator U4 connects together, connect input electrode positive pole after a branch road contact resistance R5, ground connection after a branch road contact resistance R6, after a branch road contact resistance R11, connect the grid of field effect transistor Q3;
The drain electrode of described field effect transistor Q3 connects intrinsic safety output negative pole;
Field effect transistor Q3 is described second switch.
4. a kind of mine intrinsic safety electric source dual-protection circuit as described in any one of claim 1-3; it is characterized in that; described sample circuit is completed by a sample resistance R12; one end of resistance R12 connects input power negative pole; the other end connects the source electrode of field effect transistor Q3, and one end that resistance R12 is connected with the source electrode of field effect transistor Q3 is the output of current sampling circuit.
5. a kind of mine intrinsic safety electric source dual-protection circuit as described in any one of claim 1-3; it is characterized in that; described voltage sample circuit comprises the resistance R9 and resistance R10 that are connected in series; one end of resistance R9 connects input power positive pole; one end of other end contact resistance R10; the other end of resistance R10 connects input power negative pole, and the two ends shunt capacitance C11 of resistance R10, one end that resistance R9 is connected with resistance R10 is the output of voltage sample circuit.
CN201510082373.2A 2015-02-15 2015-02-15 A kind of mine intrinsic safety electric source dual-protection circuit Active CN104617547B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111564826A (en) * 2020-05-12 2020-08-21 中国科学院上海光学精密机械研究所 Dual-protection circuit for atomic chip

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CN202856691U (en) * 2012-09-17 2013-04-03 西安天伟电子系统工程有限公司 Control protection circuit of solid state microwave power amplifier
CN103078300A (en) * 2012-12-31 2013-05-01 山西科达自控工程技术有限公司 Mine intrinsic safety lithium battery power supply system
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US4438473A (en) * 1981-07-21 1984-03-20 The United States Of America As Represented By The Secretary Of The Interior Power supply for an intrinsically safe circuit
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CN102510043A (en) * 2011-11-23 2012-06-20 山西科达自控工程技术有限公司 Safe secondary protection circuit of mine power supply
CN102695316A (en) * 2012-06-11 2012-09-26 抚顺矿灯制造总厂 Series-connection current limiting circuit of miner lamp intrinsic safety power supply
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111564826A (en) * 2020-05-12 2020-08-21 中国科学院上海光学精密机械研究所 Dual-protection circuit for atomic chip
CN111564826B (en) * 2020-05-12 2022-06-28 中国科学院上海光学精密机械研究所 Dual protection circuit for atomic chip

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Denomination of invention: A dual protection circuit for mine intrinsic safety power supply

Effective date of registration: 20220531

Granted publication date: 20171205

Pledgee: Branches of Jinan Rural Commercial Bank Co.,Ltd.

Pledgor: SHANDONG MICRO PHOTOGRAPHIC ELECTRONIC Co.,Ltd.

Registration number: Y2022980006672