CN101986680B - Interface circuit module of magneto exchange and city telephone and control method thereof - Google Patents
Interface circuit module of magneto exchange and city telephone and control method thereof Download PDFInfo
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- CN101986680B CN101986680B CN2009100901543A CN200910090154A CN101986680B CN 101986680 B CN101986680 B CN 101986680B CN 2009100901543 A CN2009100901543 A CN 2009100901543A CN 200910090154 A CN200910090154 A CN 200910090154A CN 101986680 B CN101986680 B CN 101986680B
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Abstract
The invention provides an interface circuit module of a magneto exchange and city telephone and a control method thereof. The interface circuit module comprises a ring current module, a relay set, a single chip microcomputer, a ringing detection module and a thick film circuit, wherein the ring current module is used to provide ringing signals; the relay set is composed of a plurality of relays and used to select a connecting path; the single chip microcomputer is used to realize program control and control each relay to control circuit connection and ensure that the city telephone works in a calling state or a called state; the ringing detection module is used to detect the ringing signals; and the thick film circuit is used to be connected with the interface of the city telephone and is divided into a calling thick film circuit and a called thick film circuit. The interface circuit module of the invention can be arranged in the magneto exchange or be used as an external independent module. By utilizing the interface circuit module of the invention, the ordinary telephone or video telephone can be used to realize connections and conversations between the magneto exchange operator and the user and between users; and the defect that the magneto exchange can only be used in the magneto telephone is overcome, thus the application fields of the magneto telephone are expanded.
Description
Technical field
The present invention relates to a kind of interface module and control method thereof be connected with city's phone for magneto exchange, be equally applicable to being connected between magneto exchange and video telephone set.
Background technology
Magneto exchange is the manual telephone switch that user that local battery apparatus is housed carries out telephone exchange.Its main feature is: battery is contained near every telephone set; User and operator use the magneto call call peer.The magneto exchange simple structure, be easy to produce, cheap, uses dry cell to get final product work; Lower to the circuit requirement, be applicable to the area that traffic is not in a hurry, the user is few, in small town, rural area, mine and army.
At present China's magneto exchange application be only limited to local battery apparatus between is connected and realizes conversing, lacking under special-purpose local battery apparatus or local battery apparatus damaged condition, cause and can't connect or the disconnecting accident, can't reach both sides' purpose of conversing.
Summary of the invention
The object of the present invention is to provide interface module and the control method thereof of a kind of magneto exchange and city's phone.Can realize being connected between magneto exchange and ordinary city phone by this interface module, can carry out the call function that is connected between magneto exchange operator and user, user and user by using common local call telephone or video telephone, solve magneto exchange and can only apply the drawback of local battery apparatus, and enlarged the application of magneto exchange.
Thus, the interface module of magneto exchange of the present invention and city's phone comprises: ringing-current module, relay group, single-chip microcomputer, ring detection module and thick film circuit form.Wherein, described ringing-current module is for providing bell signal; Described relay group consists of a plurality of relays, for selecting connecting path; Described single-chip microcomputer, for realizing program control, by each relay is controlled, comes control circuit to connect, and makes city's phone can successfully be operated under the calling and called two states; Described ring detection module is for detection of bell signal; Described thick film circuit is connected with the interface of city's phone for realizing, is divided into two parts of caller thick film circuit and called thick film circuit.When this module is connected with magneto exchange and city's phone, the T of switch end is connected with the relay in described relay group, the R end of switch directly is connected with the R end of city's phone, and the T end of city's phone connects from the different relay in described relay group.
Here, the T end refers to the TIP end, and the R end refers to the RING end.Mean to form respectively two electric wires of telephony wiring circuit.Tip is the another name of electrode line; Ring is the another name of negative electrical wire.
In addition, described relay group can consist of 3～4 relays, can combine according to actual needs.
When phone used is the caller state: user's off-hook, the T of caller thick film circuit, the R both end voltage is uprised by low, caller thick film circuit output high level, after single-chip microcomputer detects the high level of caller thick film circuit output, change the state of corresponding relay, the ringing-current module is connected with switch T end and R end, the ringing-current module is to the switch ring, postpone after two seconds, change again the state of corresponding relay, city's phone and ringing-current module are disconnected, simultaneously, city phone T end R end is connected respectively with switch T end R end, now, switch gives the subscriber dialing sound after bell signal being detected, the user can be dialled, realize with other users or operator between converse and be connected, user's on-hook after end of conversation, change the state of corresponding relay again, disconnects city phone T end and being connected that switch T holds.
When phone used is called state: other users or operator call user, the ring detection module detects bell signal, output low level, after single-chip microcomputer detects the low level of ring detection module output, by changing the state of corresponding relay, disconnection ring detection module is connected with switch, simultaneously, city's phone is communicated with switch, and disconnect with called thick film circuit, postpone ten seconds, within this period, the user can carry out the off-hook operation, after bell signal finishes, again change the state of corresponding relay, phone T end in city is connected respectively with switch T end R end with the R end, the user can be conversed with other users or the operator that dial into, after end of conversation user on-hook, then, by changing the state of corresponding relay, disconnect city phone T end and being connected that switch T holds.
In addition, the control method of the interface module of magneto exchange provided by the invention and city's phone, comprise caller control flow and called control flow two parts.
Carry out the caller control flow when phone used is the caller state, concrete steps are as follows:
1) user's off-hook, the T of caller thick film circuit, R both end voltage are uprised by low, caller thick film circuit output high level;
2) after single-chip microcomputer detects the high level of caller thick film circuit output, change the state of corresponding relay, the ringing-current module is connected with switch T end and R end, the ringing-current module is to the switch ring,
3) after postponing two seconds, by changing the state of corresponding relay, city's phone and ringing-current module are disconnected, simultaneously, city phone T end R end is connected respectively with switch T end R end, and now, switch gives the subscriber dialing sound after bell signal being detected, the user can be dialled, realize with other users or operator between converse and be connected;
4) after end of conversation user on-hook, again change the state of corresponding relay, disconnect city phone T end and being connected that switch T holds.
Carry out called control flow when phone used is called state, concrete steps are as follows:
1) other users or operator call user, after the ring detection module detects bell signal, output low level;
2) after single-chip microcomputer detects the low level of ring detection module output, by changing the state of corresponding relay, disconnection ring detection module is connected with switch, and ，Shi city phone is communicated with switch simultaneously, and disconnects with called thick film circuit;
3) postpone ten seconds, within this period, the user can carry out the off-hook operation, after bell signal finishes, again change the state of corresponding relay, phone T end in city is connected respectively with switch T end R end with the R end, Bing Jiang city phone and switch are communicated with called thick film circuit, and the user can be conversed with other users or the operator that dial into;
4) after end of conversation user on-hook, then, by changing the state of corresponding relay, disconnect city phone T end and being connected that switch T holds.
The interface module of magneto exchange of the present invention and city's phone and the beneficial effect of control method thereof are:
(1) adopt this interface module, do not need to change internal circuit and the structure thereof of original magneto exchange, kept electric property and the mechanical performance of original magneto exchange.
(2) this interface module volume is little, practical, both can be arranged on magneto exchange inside, also can be used as standalone module and uses separately, easy to use.
(3) can be separately due to this interface module and city's phone support the use, therefore do not affect the normal talking of magneto exchange and special-purpose magnetite telephone user.
(4) this interface module application flexibility is strong, while using magneto exchange, both can realize the conversation between city's phone (comprising video telephone) user and local battery apparatus user, also can realize the conversation between city's phone (comprising video telephone) user and city phone user.
The accompanying drawing explanation
Fig. 1 is that the system that interface module that magneto exchange of the present invention is connected with city's phone is connected with switch and city's phone forms schematic diagram.
Fig. 2 is the calling procedure figure of the control method of the interface module that is connected with city's phone of magneto exchange of the present invention.
Fig. 3 is the called flow figure of the control method of the interface module that is connected with city's phone of magneto exchange of the present invention.
Embodiment
The interface module and the control method thereof that magneto exchange of the present invention are connected with city's phone below in conjunction with the drawings and specific embodiments are described in detail.
Fig. 1 is that the system that interface module that magneto exchange of the present invention is connected with city's phone is connected with switch and city's phone forms schematic diagram.As shown in Figure 1, magneto exchange of the present invention and the interface module that city's phone is connected comprise: ringing-current module, relay group, single-chip microcomputer, ring detection module and thick film circuit form.Wherein, described ringing-current module is for providing bell signal; Described relay group consists of a plurality of relays, for selecting connecting path; Described single-chip microcomputer, for realizing program control, by each relay is controlled, comes control circuit to connect, and makes city's phone can successfully be operated under the calling and called two states; Described ring detection module is for detection of bell signal; Described thick film circuit is connected with the interface of city's phone for realizing, is divided into two parts of caller thick film circuit and called thick film circuit.When this module is connected with magneto exchange and city's phone, the T of switch end is connected with the relay in described relay group, the R end of switch directly is connected with the R end of city's phone, and the T end of city's phone connects from the different relay in described relay group.
Here, the T end refers to the TIP end, and the R end refers to the RING end.Mean to form respectively two electric wires of telephony wiring circuit.Tip is the another name of electrode line; Ring is the another name of negative electrical wire.
In addition, above-mentioned relay group can consist of 3～4 relays, can combine according to actual needs.
When phone used is the caller state: user's off-hook, the T of caller thick film circuit, the R both end voltage is uprised by low, caller thick film circuit output high level, after single-chip microcomputer detects the high level of caller thick film circuit output, change the state of corresponding relay, the ringing-current module is connected with switch T end and R end, the ringing-current module is to the switch ring, postpone after two seconds, change again the state of corresponding relay, city's phone and ringing-current module are disconnected, simultaneously, city phone T end R end is connected respectively with switch T end R end, now, switch gives the subscriber dialing sound after bell signal being detected, the user can be dialled, realize with other users or operator between converse and be connected, user's on-hook after end of conversation, change the state of corresponding relay again, disconnects city phone T end and being connected that switch T holds.
When phone used is called state: other users or operator call user, the ring detection module detects bell signal, output low level, after single-chip microcomputer detects the low level of ring detection module output, by changing the state of corresponding relay, disconnection ring detection module is connected with switch, simultaneously, city's phone is communicated with switch, and disconnect with called thick film circuit, postpone ten seconds, within this period, the user can carry out the off-hook operation, after bell signal finishes, again change the state of corresponding relay, phone T end in city is connected respectively with switch T end R end with the R end, the user can be conversed with other users or the operator that dial into, after end of conversation user on-hook, then, by changing the state of corresponding relay, disconnect city phone T end and being connected that switch T holds.
Fig. 2 is the calling procedure figure of the control method of the interface module that is connected with city's phone of magneto exchange of the present invention.Fig. 3 is the called flow figure of the control method of the interface module that is connected with city's phone of magneto exchange of the present invention.As shown in Figures 2 and 3, the control method of the interface module of magneto exchange provided by the invention and city's phone, comprise caller control flow and called control flow two parts.
Carry out the caller control flow when phone used is the caller state, concrete steps are as follows:
1) user's off-hook, the T of caller thick film circuit, R both end voltage are uprised by low, caller thick film circuit output high level;
2) after single-chip microcomputer detects the high level of caller thick film circuit output, change the state of corresponding relay, the ringing-current module is connected with switch T end and R end, the ringing-current module is to the switch ring;
3) after postponing two seconds, by changing the state of corresponding relay, city's phone and ringing-current module are disconnected, simultaneously, city phone T end R end is connected respectively with switch T end R end, and now, switch gives the subscriber dialing sound after bell signal being detected, the user can be dialled, realize with other users or operator between converse and be connected;
4) after end of conversation user on-hook, again change the state of corresponding relay, disconnect city phone T end and being connected that switch T holds.
Carry out called control flow when phone used is called state, concrete steps are as follows:
1) other users or operator call user, after the ring detection module detects bell signal, output low level;
2) after single-chip microcomputer detects the low level of ring detection module output, by changing the state of corresponding relay, disconnection ring detection module is connected with switch, and ，Shi city phone is communicated with switch simultaneously, and disconnects with called thick film circuit;
3) postpone ten seconds, within this period, the user can carry out the off-hook operation, after bell signal finishes, again change the state of corresponding relay, phone T end in city is connected respectively with switch T end R end with the R end, Bing Jiang city phone and switch are communicated with called thick film circuit, and the user can be conversed with other users or the operator that dial into;
4) after end of conversation user on-hook, then, by changing the state of corresponding relay, disconnect city phone T end and being connected that switch T holds.
Embodiment
Interface module magneto exchange of the present invention is connected with city's phone below by specific embodiment and control method thereof are done further detailed elaboration.
As shown in Figure 1, the interface module that magneto exchange of the present invention is connected with city's phone, for example be comprised of ringing-current module, relay group, single-chip microcomputer, ring detection module and thick film circuit.Wherein, the ringing-current module is for providing bell signal; The relay group consists of 4 octal relay V1～V4, for selecting connecting path; Single-chip microcomputer, for realizing program control, by each relay is controlled, comes control circuit to connect, and makes city's phone can successfully be operated under the calling and called two states; The ring detection module is for detection of bell signal; Thick film circuit is connected with the interface of city's phone for realizing, is divided into two parts of caller thick film circuit and called thick film circuit.When interface module of the present invention is connected with switch and city's phone, the R end of the R Duan Yu city phone of switch is connected, but two T ends are connected, the T end of switch and city's phone is connected respectively on different relays.
Carry out the caller control flow when phone used is the caller state, concrete steps are as follows:
1) user's off-hook, the T of caller thick film circuit, R both end voltage are uprised by low, caller thick film circuit output high level;
2) after single-chip microcomputer detects the high level of caller thick film circuit output, change relay V3 state, make V3 (3-4,8-7) be connected, change relay V1 state simultaneously, V1 (3-4) is connected, the ringing-current module now is connected with switch T, R, and the ringing-current module is to the switch ring;
3) after postponing two seconds, change relay V1 state, V1 (3-2) is connected, city's phone and ringing-current module are disconnected, simultaneously, city phone T end R end is connected respectively with switch T end R end, and switch gives the subscriber dialing sound after bell signal being detected, the user can be dialled, realize with other users or operator between converse and be connected;
4) after end of conversation user on-hook, again change relay V1 state, V1 (3-4) is connected, disconnect city phone T end and being connected that switch T holds.
Carry out called control flow when phone used is called state, concrete steps are as follows:
1) other users or operator call user, the ring detection module detects bell signal, output low level;
2) after single-chip microcomputer detects the low level of ring detection module output, change the state of relay V3, V3 (3-4,8-7) is connected, disconnection ring detection module is connected with switch, ，Shi city phone is communicated with switch simultaneously, and disconnects with called thick film circuit, then change the state of relay V4, V4 (3-4) is connected, changes the state of relay V2, V2 (3-4) is connected;
3) postpone ten seconds, within this period, the user can carry out the off-hook operation, after bell signal finishes, again change the state of relay V4, V4 (3-2) is connected, phone T end in city is connected respectively with switch T end R end with the R end, and the user can be conversed with other users or the operator that dial into;
4) user's on-hook after end of conversation, change relay V1 state, and V1 (3-4) is connected, and disconnects city phone T end and being connected that switch T holds.
In sum, the interface module that utilizes magneto exchange of the present invention to be connected with city's phone, can realize being connected between magneto exchange and city's phone, can carry out the call function that is connected between magneto exchange operator and user, user and user by using common local call telephone or video telephone, solve magneto exchange and can only apply the drawback of local battery apparatus, and enlarged the application of magneto exchange.
Claims (9)
1. the interface module of a magneto exchange and city's phone, it is characterized in that, comprise: ringing-current module, relay group, single-chip microcomputer, ring detection module and thick film circuit form, described thick film circuit, ring detection module and relay group are electrically connected to respectively on described single-chip microcomputer, and described ringing-current module is electrically connected to described relay group, thick film circuit respectively;
Wherein, described ringing-current module is for providing bell signal; Described relay group consists of a plurality of relays, for selecting connecting path; Described single-chip microcomputer, for realizing program control, by each relay is controlled, comes control circuit to connect, and makes city's phone can successfully be operated under the calling and called two states; Described ring detection module is for detection of bell signal; Described thick film circuit is connected with the interface of city's phone for realizing, is divided into two parts of caller thick film circuit and called thick film circuit,
When this interface module is connected with magneto exchange and city's phone, the R of switch end directly is connected with the R end of city's phone, two T ends are not connected, and the T end of the T Duan He city phone of switch connects from the different relay in described relay group respectively,
When phone used is the caller state: user's off-hook, the T of caller thick film circuit, the R both end voltage is uprised by low, caller thick film circuit output high level, after single-chip microcomputer detects the high level of caller thick film circuit output, change the state of corresponding relay, the ringing-current module is connected with switch T end and R end, the ringing-current module is to the switch ring, postpone after two seconds, change again the state of corresponding relay, city's phone and ringing-current module are disconnected, simultaneously, city phone T end R end is connected respectively with switch T end R end, now, switch gives the subscriber dialing sound after bell signal being detected, the user can be dialled, realize with other users or operator between converse and be connected, user's on-hook after end of conversation, change the state of corresponding relay again, disconnects city phone T end and being connected that switch T holds,
When phone used is called state: other users or operator call user, the ring detection module detects bell signal, output low level, after single-chip microcomputer detects the low level of ring detection module output, by changing the state of corresponding relay, disconnection ring detection module is connected with switch, simultaneously, city's phone is communicated with switch, and disconnect with called thick film circuit, postpone ten seconds, within this period, the user can carry out the off-hook operation, after bell signal finishes, again change the state of corresponding relay, phone T end in city is connected respectively with switch T end R end with the R end, Bing Jiang city phone and switch are communicated with called thick film circuit, the user can be conversed with other users or the operator that dial into, after end of conversation user on-hook, then, by changing the state of corresponding relay, disconnect city phone T end and being connected that switch T holds.
2. the interface module of magneto exchange as claimed in claim 1 and city's phone, is characterized in that, this interface module is arranged on magneto exchange inside, or use separately as outside standalone module.
3. the interface module of magneto exchange as claimed in claim 1 and city's phone, is characterized in that, this interface module and plain old telephone or video telephone and magneto exchange are connected, and realizes conversation.
4. the interface module of magneto exchange as described as any one in claim 1～3 and city's phone, is characterized in that, described relay group consists of 3～4 relays, is used in combination according to actual needs.
5. the control method of the interface module of a magneto exchange and city's phone, this interface module comprises: ringing-current module, relay group, single-chip microcomputer, ring detection module and thick film circuit, described thick film circuit, ring detection module and relay group are electrically connected to respectively on described single-chip microcomputer, and described ringing-current module is electrically connected to described relay group, thick film circuit respectively;
Wherein, described ringing-current module is for providing bell signal; Described relay group consists of a plurality of relays, for selecting connecting path; Described single-chip microcomputer, for realizing program control, by each relay is controlled, comes control circuit to connect, and makes city's phone can successfully be operated under the calling and called two states; Described ring detection module is for detection of bell signal; Described thick film circuit is connected with the interface of city's phone for realizing, is divided into two parts of caller thick film circuit and called thick film circuit,
When this interface module is connected with magneto exchange and city's phone, the R of switch end directly is connected with the R end of city's phone, two T ends are not connected, and the T end of the T Duan He city phone of switch connects from the different relay in described relay group respectively;
Described control method comprises caller control flow and called control flow two parts,
Carry out the caller control flow when phone used is the caller state, concrete steps are as follows:
1) user's off-hook, the T of caller thick film circuit, R both end voltage are uprised by low, caller thick film circuit output high level;
2) after single-chip microcomputer detects the high level of caller thick film circuit output, change the state of corresponding relay, the ringing-current module is connected with switch T end and R end, the ringing-current module is to the switch ring;
3) after postponing two seconds, by changing the state of corresponding relay, city's phone and ringing-current module are disconnected, simultaneously, city phone T end R end is connected respectively with switch T end R end, and now, switch gives the subscriber dialing sound after bell signal being detected, the user can be dialled, realize with other users or operator between converse and be connected;
4) after end of conversation user on-hook, again change the state of corresponding relay, disconnect city phone T end and being connected that switch T holds,
Carry out called control flow when phone used is called state, concrete steps are as follows:
1) other users or operator call user, after the ring detection module detects bell signal, output low level;
2) after single-chip microcomputer detects the low level of ring detection module output, by changing the state of corresponding relay, disconnection ring detection module is connected with switch, and ，Shi city phone is communicated with switch simultaneously, and disconnects with called thick film circuit;
3) postpone ten seconds, within this period, the user can carry out the off-hook operation, after bell signal finishes, again change the state of corresponding relay, phone T end in city is connected respectively with switch T end R end with the R end, Bing Jiang city phone and switch are communicated with called thick film circuit, and the user can be conversed with other users or the operator that dial into;
4) after end of conversation user on-hook, then, by changing the state of corresponding relay, disconnect city phone T end and being connected that switch T holds.
6. the control method of the interface module of magneto exchange as claimed in claim 5 and city's phone, is characterized in that, described interface module is arranged on magneto exchange inside, or use separately as outside standalone module.
7. the control method of the interface module of magneto exchange as claimed in claim 5 and city's phone, is characterized in that, described interface module and plain old telephone or video telephone and magneto exchange are connected, and realizes conversation.
8. the control method of the interface module of magneto exchange as described as any one in claim 5～7 and city's phone, is characterized in that, described relay group consists of 3～4 relays, is used in combination according to actual needs.
9. the control method of the interface module of magneto exchange as described as any one in claim 5～7 and city's phone, is characterized in that, described relay group consists of 4 octal relay V1～V4,
Carry out the caller control flow when phone used is the caller state, concrete steps are as follows:
1) user's off-hook, the T of caller thick film circuit, R both end voltage are uprised by low, caller thick film circuit output high level;
2) after single-chip microcomputer detects the high level of caller thick film circuit output, change relay V3 state, the 3-4 end points of relay V3 is connected respectively with the 8-7 end points, change relay V1 state simultaneously, the 3-4 end points of relay V1 is connected, now the ringing-current module is connected with switch T, R, and the ringing-current module is to the switch ring;
3) after postponing two seconds, change relay V1 state, the 3-2 end points of relay V1 is connected, city's phone and ringing-current module are disconnected, simultaneously, city phone T end R end is connected respectively with switch T end R end, and switch gives the subscriber dialing sound after bell signal being detected, the user can be dialled, realize with other users or operator between converse and be connected;
4) after end of conversation user on-hook, again change relay V1 state, the 3-4 end points of relay V1 be connected, disconnect city phone T end and being connected that switch T holds,
Carry out called control flow when phone used is called state, concrete steps are as follows:
1) other users or operator call user, the ring detection module detects bell signal, output low level;
2) after single-chip microcomputer detects the low level of ring detection module output, change the state of relay V3,3-4 end points and the 8-7 end points of relay V3 are connected, and disconnection ring detection module is connected with switch, simultaneously, city's phone is communicated with switch, and disconnect with called thick film circuit, then change the state of relay V4, the 3-4 end points of relay V4 is connected, change the state of relay V2, the 3-4 end points of relay V2 is connected;
3) postpone ten seconds, within this period, the user can carry out the off-hook operation, after bell signal finishes, again change the state of relay V4, the 3-2 end points of relay V4 is connected, phone T end in city is connected respectively with switch T end R end with the R end, and the user can be conversed with other users or the operator that dial into;
4) user's on-hook after end of conversation, change relay V1 state, and the 3-4 end points of relay V1 is connected, and disconnects city phone T end and being connected that switch T holds.
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| CN2009100901543A CN101986680B (en) | 2009-07-29 | 2009-07-29 | Interface circuit module of magneto exchange and city telephone and control method thereof |
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| CN2009100901543A CN101986680B (en) | 2009-07-29 | 2009-07-29 | Interface circuit module of magneto exchange and city telephone and control method thereof |
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| CN102510415B (en) * | 2011-12-26 | 2014-10-01 | 北京世纪东方国铁科技股份有限公司 | Magnet telephone converter |
| CN110099177B (en) * | 2019-03-22 | 2021-12-14 | 珠海高凌信息科技股份有限公司 | Voice detection and processing circuit of telephone |
| CN110995948B (en) * | 2019-11-22 | 2021-07-27 | 北京讯风光通信技术开发有限责任公司 | Method for transmitting PCM magneto telephone in VOIP system |
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| CN1070527A (en) * | 1992-08-21 | 1993-03-31 | 中国科学院空间科学与应用研究中心 | Program controlled magneto system telephone user exchange system |
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| CN201491087U (en) * | 2009-07-29 | 2010-05-26 | 中国科学院空间科学与应用研究中心 | Interface circuit module of magneto exchange and local exchange |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1070527A (en) * | 1992-08-21 | 1993-03-31 | 中国科学院空间科学与应用研究中心 | Program controlled magneto system telephone user exchange system |
| CN101262536A (en) * | 2007-03-07 | 2008-09-10 | 北京佳讯飞鸿电气股份有限公司 | A realization method and device for ring current and magnetic ring signal |
| CN201491087U (en) * | 2009-07-29 | 2010-05-26 | 中国科学院空间科学与应用研究中心 | Interface circuit module of magneto exchange and local exchange |
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