CN203949981U - A kind of multichannel DC/DC isolated converter test macro - Google Patents
A kind of multichannel DC/DC isolated converter test macro Download PDFInfo
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- CN203949981U CN203949981U CN201420289049.9U CN201420289049U CN203949981U CN 203949981 U CN203949981 U CN 203949981U CN 201420289049 U CN201420289049 U CN 201420289049U CN 203949981 U CN203949981 U CN 203949981U
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Abstract
The utility model discloses a kind of multichannel DC/DC isolated converter test macro; belong to electric and electronic technical field, comprise DC power supplier, voltage handover module, test handover module, data read module, software control module, display module, alarm and protection module and load blocks.The utility model can be tested the magnitude of voltage of multichannel DC/DC isolated converter output, the effective value of voltage ripple, the peak-to-peak value of voltage ripple; Compare by test data and correct test specification value, whether checking multichannel DC/DC isolated converter meets the index of dispatching from the factory.The utility model is applicable to the test of multichannel DC/DC transducer under zero load, semi-load and full load conditions, there is higher reliability, can work long hours, operation interface close friend, the features such as test error is little, fully meet the testing requirement of multichannel DC/DC isolated converter.
Description
Technical field
The utility model relates to a kind of multichannel DC/DC isolated converter test macro, belongs to electric and electronic technical field.
Background technology
DC/DC isolated converter (DC-DC isolated converter) is as ingredient important in electronic product, the size of the stability of its output voltage and the effective value of output ripple, peak-to-peak value directly determines the reliability of whole electronic product, even affects the use of electronic equipment entirety.So the test of the output voltage parameter to DC/DC isolated converter, the effective value of voltage ripple and peak-to-peak value is most important.
DC/DC isolated converter is mostly artificial single-path testing in producing at present, can not realize multi-channel test, so both affect testing efficiency, reduced production efficiency, increase again a large amount of human costs, also likely there is corresponding personal error in artificial test simultaneously, reduces the accuracy of test.For the deficiency of existing DC/DC isolated converter test, need to study a kind of multichannel DC/DC isolated converter intelligent test system, can realize the intelligent test of multichannel DC/DC isolated converter, improve testing efficiency, reduce human cost, meet the needs of production.
Utility model content
Technology of the present utility model is dealt with problems and is: overcome the deficiencies in the prior art, a kind of multichannel DC/DC isolated converter test macro is provided, realizes the intelligent test to multichannel DC/DC isolated converter, improved the testing efficiency of product, reduce testing cost, improved the consistance of test.
Technical solution of the present utility model is: a kind of multichannel DC/DC isolated converter test macro, comprises DC power supplier, voltage transformation module, test handover module, data read module, software control module, display module, alarm and protection module and load blocks;
DC power supplier is connected with multichannel DC/DC isolated converter and voltage transformation module respectively, is multichannel DC/DC isolated converter and provide+28V of voltage transformation module DC voltage; Voltage transformation module is connected with test handover module, for test handover module provides voltage; The test port of multichannel DC/DC isolated converter is connected with the input end of data read module through test handover module, and the load port of multichannel DC/DC isolated converter is connected with load blocks; The output terminal of data read module is connected with the input end of software control module; The output terminal of software control module is connected with display module with test handover module, alarm and protection module respectively.
Described voltage transformation module comprises reverse-connection preventing circuit, EMC filtering circuit and step-down conversion circuit, reverse-connection preventing circuit input end is connected with DC power supplier, output terminal is connected with the input end of step-down conversion circuit by EMC filtering circuit, and the output terminal of step-down conversion circuit is connected with test handover module.
Described reverse-connection preventing circuit comprises protective tube FU1, resistance R 1, resistance R 2, relay K 1, diode V1, diode V2, LED 1;
One end of protective tube FU1 connect forward input voltage VIN+, the other end of FU1 connects the positive input of relay K 1 on the one hand, connects on the other hand the anode of diode V1 by resistance R 1; The negative electrode of diode V1 connects the control anode of relay K 1 on the one hand, connects on the other hand the negative electrode of diode V2; After the anode of diode V2 is connected with the control negative terminal of relay K 1 on the one hand with negative sense input voltage VIN-be connected, be connected with the negative electrode of LED 1 on the other hand, the anode of LED 1 is connected with the forward output terminal VIN1+ of relay K 1 by resistance R 2.
Described test handover module comprises voltage commutation circuit and current sampling circuit; The input end of voltage commutation circuit is connected with the test port of multichannel DC/DC isolated converter, and the output terminal of voltage commutation circuit is connected with the input end of data read module; The input end of current sampling circuit is connected with voltage transformation module, and the output terminal of current sampling circuit is connected with the input end of data read module.
Described current sampling circuit comprises resistance R S1, resistance R S2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, resistance R 8, resistance R 9, potentiometer RP1, capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4, capacitor C 5, operational amplifier N1 and operational amplifier N2;
Wherein the model of operational amplifier N1 is CA3140, and the model of operational amplifier N2 is LM258;
Resistance R S1 and resistance R S2 are connected in parallel between power supply sample rate current I1 and ground, power supply sample rate current I1 contact resistance R3 simultaneously, and the other end of resistance R 3 connects the pin 3 of operational amplifier N1 on the one hand, on the other hand by resistance R 4 ground connection; The pin 2 of operational amplifier N1 is by resistance R 5 ground connection; Capacitor C 4 and resistance R 8 are connected in parallel between the pin 2 and pin 6 of operational amplifier N1, and capacitor C 3 and resistance R 7 are connected in series between the pin 2 and pin 6 of operational amplifier N1 simultaneously; The pin 5 of operational amplifier N1 is by capacitor C 1 ground connection, and the pin 1 of operational amplifier N1 is by capacitor C 2 ground connection, and potentiometer RP1 is connected between the pin 5 and pin 1 of operational amplifier N1, and resistance R 6 is connected between the control end and ground of potentiometer RP1; Connect+12V of pin 7 power supply of operational amplifier N1, pin 4 ground connection;
The pin 6 of operational amplifier N1 is connected with one end of resistance R 9, and the other end of resistance R 9 passes through capacitor C 5 ground connection on the one hand, the pin 3 of concatenation operation amplifier N2 on the other hand, and the pin 2 of operational amplifier N2 is connected with pin 1; Connect+12V of pin 8 power supply of operational amplifier N2, pin 4 ground connection; Current sampling circuit is outwards exported the current value I 2 after amplifying by the pin 1 of operational amplifier N2.
The utility model compared with prior art has following beneficial effect:
(1) the utility model is realized the test of magnitude of voltage, the effective value of voltage ripple and the peak-to-peak value of voltage ripple to the output of multichannel DC/DC isolated converter, and the output of Dui30 road DC/DC isolated converter is simultaneously tested;
(2) the utility model adopts intelligent control technology, can realize the full intelligent test to multichannel DC/DC isolated converter, improves testing efficiency, reduces tester's labour intensity;
(3) the utlity model has measuring accuracy high, the advantages such as dependable performance, the measuring accuracy of DC voltage value reaches 1 ‰, the measuring accuracy of voltage ripple effective value reaches 1 ‰, the measuring accuracy of voltage ripple peak-to-peak value reaches 5%, in test process, adopt interlocking design, improved the safety and reliability of test.
Brief description of the drawings
Fig. 1 is the utility model functional block diagram;
Fig. 2 is the utility model voltage transformation module functional block diagram;
Fig. 3 is the utility model reverse-connection preventing circuit schematic diagram;
Fig. 4 is the utility model test handover module functional block diagram;
Fig. 5 is the utility model current sampling circuit schematic diagram;
Fig. 6 is the utility model voltage commutation circuit schematic diagram.
Embodiment
As shown in Figure 1, multichannel DC/DC isolated converter test macro comprises DC power supplier 1, voltage handover module 2, test handover module 3, data read module 4, software control module 5, display module 6, alarm and protection module 7 and load blocks 8.
Multichannel DC/DC isolated converter and provide+28V of voltage transformation module 2 DC voltage are provided DC power supplier 1; Voltage transformation module 2 is connected with test handover module 3, for test handover module 3 provides voltage; The test port of multichannel DC/DC isolated converter is connected with the input end of data read module 4 through test handover module 3, and the load port of multichannel DC/DC isolated converter is connected with load blocks 8; The output terminal of data read module 4 is connected with the input end of software control module 5; The output terminal of software control module 5 is connected with display module 6 with test handover module 3, alarm and protection module 7 respectively.
As shown in Figure 2, voltage transformation module 2 comprises reverse-connection preventing circuit 9, EMC filtering circuit 10 and step-down conversion circuit 11, reverse-connection preventing circuit 9 input ends are connected with DC power supplier 1, output terminal is connected with the input end of step-down conversion circuit 11 by EMC filtering circuit 10, and the output terminal of step-down conversion circuit 11 is connected with test handover module 3.
As shown in Figure 4, test handover module 3 comprises voltage commutation circuit 12 and current sampling circuit 13; The input end of voltage commutation circuit 12 is connected with multichannel DC/DC isolated converter, the output terminal of voltage commutation circuit 12 is connected with data read module 4, the input end of current sampling circuit 13 is connected with the EMC filtering circuit 10 in voltage transformation module 2, and the output terminal of current sampling circuit 13 is connected with data read module 4.
The course of work of the present utility model is:
DC power supplier 1 is connected with voltage transformation module 2 with tested multichannel DC/DC isolated converter respectively, provides 28V DC voltage to multichannel DC/DC isolated converter and voltage transformation module 2; Multichannel DC/DC isolated converter one end is connected with load blocks 8, and for multichannel DC/DC isolated converter is loaded, the other end is connected with data read module 4 through test handover module 3.The 28V DC voltage that voltage transformation module 2 provides DC power supplier 1 carry out obtain after step-down conversion+5V and+12V DC voltage, and export to test handover module 3; Software control module 5 sends test channel switching command and test steering order to test handover module 3, test handover module 3 carries out the switching of circuit way according to the test channel switching command receiving to multichannel DC/DC isolated converter, according under the test steering order receiving, the magnitude of voltage (comprising the effective value of magnitude of voltage, voltage ripple and the peak-to-peak value of voltage ripple) of certain paths output tested in multichannel DC/DC isolated converter being read, and the test result reading is sent to data read module 4; Test handover module 3 is sampled and amplifies the supply current of voltage transformation module 2, then these data is read, and the test result reading is sent to data read module 4; The test result of acquisition is sent to software control module 5 by data read module 4, and software control module 5 is exported to display module 6 after test result is processed and shown; When software control module 5 finds that there is test failure or data when overproof, software control module 5 sends alarm command to alarm and protection module 7 and realizes alarm.
The principle of work of voltage transformation module 2 is: the 28V DC voltage value that DC power supplier 1 is exported is exported to EMC filtering circuit 10 after reverse-connection preventing circuit 9 is processed, EMC filtering circuit 10 carries out exporting to step-down conversion circuit 11 after filtering processing to reverse-connection preventing circuit 9 voltage after treatment, step-down conversion circuit 11 to filtering voltage after treatment carry out step-down conversion and isolation after obtain+5V and+12V DC voltage, export to test handover module 3.Wherein EMC filtering circuit is the filtering circuit of filtering electromagnetic interference (EMI).
The principle of work of test handover module 3 is: voltage commutation circuit 12 carries out the switching of circuit way according to the test channel switching command receiving to multichannel DC/DC isolated converter, under the test steering order of software control module 5, reads switching Hou Gai road magnitude of voltage (comprising the effective value of magnitude of voltage, voltage ripple and the peak-to-peak value of voltage ripple); Current sampling circuit 13 is connected with EMC filtering circuit 10, for the supply current of voltage transformation module 2 is sampled, and this electric current is amplified, and reads.
As shown in Figure 3, reverse-connection preventing circuit 9 comprises protective tube FU1, resistance R 1, resistance R 2, relay K 1, diode V1, diode V2, LED 1.
One end of protective tube FU1 connect forward input voltage VIN+, the other end of FU1 connects the positive input of relay K 1 on the one hand, connects on the other hand the anode of diode V1 by resistance R 1; The negative electrode of diode V1 connects the control anode of relay K 1 on the one hand, connects on the other hand the negative electrode of diode V2; After the anode of diode V2 is connected with the control negative terminal of relay K 1 on the one hand with negative sense input voltage VIN-be connected, be connected with the negative electrode of LED 1 on the other hand, the anode of LED 1 is connected with the forward output terminal VIN1+ of relay K 1 by resistance R 2.
As shown in Figure 5, current sampling circuit 13 comprises resistance R S1, resistance R S2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, resistance R 8, resistance R 9, potentiometer RP1, capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4, capacitor C 5, operational amplifier N1 and operational amplifier N2.Wherein the model of operational amplifier N1 is CA3140, and the model of operational amplifier N2 is LM258.
Resistance R S1 and resistance R S2 are connected in parallel between power supply sample rate current I1 and ground, power supply sample rate current I1 contact resistance R3 simultaneously, and the other end of resistance R 3 connects the pin 3 of operational amplifier N1 on the one hand, on the other hand by resistance R 4 ground connection; The pin 2 of operational amplifier N1 is by resistance R 5 ground connection; Capacitor C 4 and resistance R 8 are connected in parallel between the pin 2 and pin 6 of operational amplifier N1, and capacitor C 3 and resistance R 7 are connected in series between the pin 2 and pin 6 of operational amplifier N1 simultaneously; The pin 5 of operational amplifier N1 is by capacitor C 1 ground connection, and the pin 1 of operational amplifier N1 is by capacitor C 2 ground connection, and potentiometer RP1 is connected between the pin 5 and pin 1 of operational amplifier N1, and resistance R 6 is connected between the control end and ground of potentiometer RP1; Connect+12V of pin 7 power supply of operational amplifier N1, pin 4 ground connection;
The pin 6 of operational amplifier N1 is connected with one end of resistance R 9, and the other end of resistance R 9 passes through capacitor C 5 ground connection on the one hand, the pin 3 of concatenation operation amplifier N2 on the other hand, and the pin 2 of operational amplifier N2 is connected with pin 1; Connect+12V of pin 8 power supply of operational amplifier N2, pin 4 ground connection; Current sampling circuit 13 is outwards exported the current value I 2 after amplifying by the pin 1 of operational amplifier N2.
Voltage commutation circuit 12 comprises n commutation circuit, and n is the way of multichannel DC/DC isolated converter, is mainly made up of resistance, relay, diode and light emitting diode, and each relay has two positive inputs and two negative inputs.
Voltage commutation circuit while being illustrated in figure 6 n=30, comprises relay K 2, K3 ... K31, diode V3, V4 ... V32, LED 2, LED3 ... LED31, resistance R 11, R12 ... R40.Each relay has two positive inputs and two negative inputs, as relay K 2 has positive input V11+, V12+, and negative input V11-, V12-.Relay K 3 has positive input V21+, V22+, negative input V21-, V22-.
First commutation circuit comprises relay K 2, diode V3, LED 2 and resistance R 11.All connect+12V of the control anode power supply of the negative electrode of resistance R 11, diode V3 and relay K 2, the anode of diode V3 is connected with the control negative terminal of relay K 2, the anode of LED 2 is connected with resistance R 11, and the negative electrode of LED 2 is connected with the control negative terminal of relay K 2; The positive input V11+ of relay K 2 is connected with the positive input V21+ of relay K 3, and the negative input V11-of relay K 2 is connected with the negative input V21-of relay K 3.The rest may be inferred for other each commutation circuit annexations.The positive input V301+ of the relay K 31 in the 30 commutation circuit is connected with Voltage-output VOUT+, and the negative input V301-of relay K 31 is connected with Voltage-output VOUT-.
V12+, V12-... V302+, V302-are the voltage input of DC/DC isolated converter; V3 ... V32 is relay K 2 ... the backward dioded of K31 line Bao Duan, uses as bleed-off circuit; LED2 ... LED31 is relay relay indicating light, and in the time of relay closes, corresponding pilot lamp is luminous; ID1 ... ID30 is that pilot relay is opened and closed control signal, is sent by software control module 5.The course of work is, software control module sends steering order, corresponding ID becomes low level, make corresponding relay switch be connected to DC/DC isolated converter Mou road voltage input end, relay conducting, the input voltage of DC/DC isolated converter is transferred to VOUT+ and VOUT-through relay, realizes the gating to input circuit, VOUT+ and VOUT-are transferred to data read module 4 again.Circuit relay electrical equipment K2 ... K31 adopts interlock mode, has prevented DC/DC isolated converter because of fault between different circuit and that series connection causes or has burnt out, and has improved the testing reliability of DC/DC isolated converter.
Function of the present utility model: the 1. magnitude of voltage of test multichannel DC/DC isolated converter output, the effective value of voltage ripple, the peak-to-peak value of voltage ripple; 2. compare by test data and correct test specification value, whether checking multichannel DC/DC isolated converter meets the index of dispatching from the factory.The utility model is applicable to the test of multichannel DC/DC transducer under zero load, semi-load and full load conditions; There is higher reliability, can work long hours, operation interface close friend, the feature such as test error is little, fully meets the testing requirement of multichannel DC/DC isolated converter.
The unspecified part of the utility model belongs to general knowledge as well known to those skilled in the art.
Claims (5)
1. a multichannel DC/DC isolated converter test macro, is characterized in that: comprise DC power supplier (1), voltage transformation module (2), test handover module (3), data read module (4), software control module (5), display module (6), alarm and protection module (7) and load blocks (8);
DC power supplier (1) is connected with multichannel DC/DC isolated converter and voltage transformation module (2) respectively, is multichannel DC/DC isolated converter and provide+28V of voltage transformation module (2) DC voltage; Voltage transformation module (2) is connected with test handover module (3), for test handover module (3) provides voltage; The test port of multichannel DC/DC isolated converter is connected with the input end of data read module (4) through test handover module (3), and the load port of multichannel DC/DC isolated converter is connected with load blocks (8); The output terminal of data read module (4) is connected with the input end of software control module (5); The output terminal of software control module (5) is connected with display module (6) with test handover module (3), alarm and protection module (7) respectively.
2. a kind of multichannel DC/DC isolated converter test macro according to claim 1, it is characterized in that: described voltage transformation module (2) comprises reverse-connection preventing circuit (9), EMC filtering circuit (10) and step-down conversion circuit (11), reverse-connection preventing circuit (9) input end is connected with DC power supplier (1), output terminal is connected with the input end of step-down conversion circuit (11) by EMC filtering circuit (10), and the output terminal of step-down conversion circuit (11) is connected with test handover module (3).
3. a kind of multichannel DC/DC isolated converter test macro according to claim 2, is characterized in that: described reverse-connection preventing circuit (9) comprises protective tube FU1, resistance R 1, resistance R 2, relay K 1, diode V1, diode V2, LED 1;
One end of protective tube FU1 connect forward input voltage VIN+, the other end of FU1 connects the positive input of relay K 1 on the one hand, connects on the other hand the anode of diode V1 by resistance R 1; The negative electrode of diode V1 connects the control anode of relay K 1 on the one hand, connects on the other hand the negative electrode of diode V2; After the anode of diode V2 is connected with the control negative terminal of relay K 1 on the one hand with negative sense input voltage VIN-be connected, be connected with the negative electrode of LED 1 on the other hand, the anode of LED 1 is connected with the forward output terminal VIN1+ of relay K 1 by resistance R 2.
4. a kind of multichannel DC/DC isolated converter test macro according to claim 1, is characterized in that: described test handover module (3) comprises voltage commutation circuit (12) and current sampling circuit (13); The input end of voltage commutation circuit (12) is connected with the test port of multichannel DC/DC isolated converter, and the output terminal of voltage commutation circuit (12) is connected with the input end of data read module (4); The input end of current sampling circuit (13) is connected with voltage transformation module (2), and the output terminal of current sampling circuit (13) is connected with the input end of data read module (4).
5. a kind of multichannel DC/DC isolated converter test macro according to claim 4, is characterized in that: described current sampling circuit (13) comprises resistance R S1, resistance R S2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, resistance R 8, resistance R 9, potentiometer RP1, capacitor C 1, capacitor C 2, capacitor C 3, capacitor C 4, capacitor C 5, operational amplifier N1 and operational amplifier N2;
Wherein the model of operational amplifier N1 is CA3140, and the model of operational amplifier N2 is LM258;
Resistance R S1 and resistance R S2 are connected in parallel between power supply sample rate current I1 and ground, power supply sample rate current I1 contact resistance R3 simultaneously, and the other end of resistance R 3 connects the pin 3 of operational amplifier N1 on the one hand, on the other hand by resistance R 4 ground connection; The pin 2 of operational amplifier N1 is by resistance R 5 ground connection; Capacitor C 4 and resistance R 8 are connected in parallel between the pin 2 and pin 6 of operational amplifier N1, and capacitor C 3 and resistance R 7 are connected in series between the pin 2 and pin 6 of operational amplifier N1 simultaneously; The pin 5 of operational amplifier N1 is by capacitor C 1 ground connection, and the pin 1 of operational amplifier N1 is by capacitor C 2 ground connection, and potentiometer RP1 is connected between the pin 5 and pin 1 of operational amplifier N1, and resistance R 6 is connected between the control end and ground of potentiometer RP1; Connect+12V of pin 7 power supply of operational amplifier N1, pin 4 ground connection;
The pin 6 of operational amplifier N1 is connected with one end of resistance R 9, and the other end of resistance R 9 passes through capacitor C 5 ground connection on the one hand, the pin 3 of concatenation operation amplifier N2 on the other hand, and the pin 2 of operational amplifier N2 is connected with pin 1; Connect+12V of pin 8 power supply of operational amplifier N2, pin 4 ground connection; Current sampling circuit (13) is outwards exported the current value I 2 after amplifying by the pin 1 of operational amplifier N2.
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| CN201420289049.9U CN203949981U (en) | 2014-05-30 | 2014-05-30 | A kind of multichannel DC/DC isolated converter test macro |
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| CN107290689A (en) * | 2016-04-12 | 2017-10-24 | 中国运载火箭技术研究院 | The Auto-Test System of DC/DC converters total dose effect experiment |
| CN108990217A (en) * | 2018-09-02 | 2018-12-11 | 华域视觉科技(上海)有限公司 | The EMC self-test verification method of headlamp LED drive module |
| CN109212339A (en) * | 2017-06-30 | 2019-01-15 | 杭州比亚迪汽车有限公司 | The test macro and its test method of direct current conversion |
| CN109327368A (en) * | 2018-10-30 | 2019-02-12 | 天津津航计算技术研究所 | A kind of device for the relaying conversion of 1553B bus branch |
| CN109888926A (en) * | 2019-04-12 | 2019-06-14 | 贵州电网有限责任公司 | A kind of portable power transformation O&M terminal |
| CN110196371A (en) * | 2019-06-28 | 2019-09-03 | 潍柴动力股份有限公司 | The test macro of DC-DC converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107290689A (en) * | 2016-04-12 | 2017-10-24 | 中国运载火箭技术研究院 | The Auto-Test System of DC/DC converters total dose effect experiment |
| CN109212339A (en) * | 2017-06-30 | 2019-01-15 | 杭州比亚迪汽车有限公司 | The test macro and its test method of direct current conversion |
| CN108990217A (en) * | 2018-09-02 | 2018-12-11 | 华域视觉科技(上海)有限公司 | The EMC self-test verification method of headlamp LED drive module |
| CN108990217B (en) * | 2018-09-02 | 2021-07-20 | 华域视觉科技(上海)有限公司 | EMC self-checking method for headlamp LED driving module |
| CN109327368A (en) * | 2018-10-30 | 2019-02-12 | 天津津航计算技术研究所 | A kind of device for the relaying conversion of 1553B bus branch |
| CN109888926A (en) * | 2019-04-12 | 2019-06-14 | 贵州电网有限责任公司 | A kind of portable power transformation O&M terminal |
| CN109888926B (en) * | 2019-04-12 | 2023-12-12 | 贵州电网有限责任公司 | Portable transformer operation and maintenance terminal |
| CN110196371A (en) * | 2019-06-28 | 2019-09-03 | 潍柴动力股份有限公司 | The test macro of DC-DC converter |
| CN110196371B (en) * | 2019-06-28 | 2021-02-23 | 潍柴动力股份有限公司 | Test system of DC-DC converter |
| CN112179528A (en) * | 2020-08-21 | 2021-01-05 | 武汉中航传感技术有限责任公司 | CMOS integrated circuit and pressure sensor |
| CN112557772A (en) * | 2020-12-07 | 2021-03-26 | 天津津航计算技术研究所 | Small-size alternating current of single power keeps apart detection module |
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Granted publication date: 20141119 Termination date: 20200530 |