CN203481783U - Short circuit and overcurrent protection circuit and mass production test equipment - Google Patents
Short circuit and overcurrent protection circuit and mass production test equipment Download PDFInfo
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- CN203481783U CN203481783U CN201320594273.4U CN201320594273U CN203481783U CN 203481783 U CN203481783 U CN 203481783U CN 201320594273 U CN201320594273 U CN 201320594273U CN 203481783 U CN203481783 U CN 203481783U
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Abstract
The utility model belongs to the technical field of short circuit and overcurrent protection, and provides a short circuit and overcurrent protection circuit and mass production test equipment. The short circuit and overcurrent protection circuit is composed of a switch module, a microprocessor, a short circuit protection module and a current detection module. When a tested unit is short-circuited, the output current of the switch module is correspondingly led to the grounding end of a direct-current power supply by the short circuit protection module according to the voltage at the output end of the current detection module loop; when overcurrent happens to the test loop of the tested unit, the current detection module correspondingly outputs an abnormal signal at the input end and/or at the loop end according to the current at the input end and/or the loop end of the tested unit to drive the microprocessor to send out an off signal to control the switch module to quickly cut off the current path. Thus, quick short circuit and overcurrent protection is realized on the tested unit and the test circuit, the tested unit and the test circuit are protected from being damaged, and the production efficiency is further improved.
Description
Technical field
The utility model belongs to short circuit overcurrent resist technology field, relates in particular to a kind of short circuit overcurrent protective circuit and volume production testing equipment.
Background technology
IC chip or power-supply system are being carried out in batch production process; need to adopt testing equipment to test to determine whether to reach indices to unit under tests such as IC chip or power-supply systems; existing testing equipment often lacks short circuit overcurrent defencive function or only possesses single hardware protection function or software protection function; when running into when short circuit or overcurrent appear in unit under test, there will be because response speed is slow and cannot to test circuit and unit under test, implement short circuit overcurrent protection fast; thereby test circuit and unit under test are damaged, and have reduced production efficiency.
Summary of the invention
The purpose of this utility model is to provide a kind of short circuit overcurrent protective circuit; be intended to solve prior art when there is short circuit or overcurrent in unit under test because response speed slowly cannot be implemented rapid cut-off overcurrent protection to test circuit and unit under test, thereby test circuit and unit under test are damaged and reduce the problem of production efficiency.
The utility model is achieved in that a kind of short circuit overcurrent protective circuit, is connected with DC power supply, unit under test and test circuit, and the input of described unit under test is connected to test with test circuit with loop end;
Described short circuit overcurrent protective circuit comprises:
Switch module, microprocessor, short circuit protection module and current detection module;
The input of described switch module connects the output of described DC power supply, the input of described short circuit protection module and the input of described current detection module are connected to the output of described switch module altogether, the output of described current detection module and loop input are connected respectively input and the loop end of described unit under test, the voltage sample end of described short circuit protection module connects the loop output of described current detection module, the loop end of described short circuit protection module connects the earth terminal of described DC power supply, described microprocessor connects the first overcurrent feedback end and the second overcurrent feedback end of described current detection module, described microprocessor is also connected with the control end of described test circuit and described switch module,
When described test circuit starts described unit under test to test, by described microprocessor, according to the operating state of described test circuit, send Continuity signal and control described switch module maintenance conducting state, when short circuit appears in described unit under test, described short circuit protection module correspondingly causes the output current of the output of described switch module the earth terminal of described DC power supply according to the voltage of the loop output of described current detection module; When there is overcurrent in the test loop of described unit under test, according to the electric current of the input of described unit under test and/or loop end, correspondingly I/O abnormal signal and/or loop end abnormal signal, to described microprocessor, then send cut-off signals by described microprocessor and control described switch module and cut off current path described current detection module.
Another object of the present utility model is also to provide a kind of volume production testing equipment, and described volume production testing equipment comprises test circuit and above-mentioned short circuit overcurrent protective circuit.
The utility model comprises switch module by employing, microprocessor, the short circuit overcurrent protective circuit of short circuit protection module and current detection module, when there is short circuit in unit under test, short circuit protection module correspondingly causes the output current of switch module the earth terminal of DC power supply according to the voltage of the loop output of current detection module, when there is overcurrent in the test loop of unit under test, according to the electric current of the input of unit under test and/or loop end, correspondingly I/O abnormal signal and/or loop end abnormal signal drive microprocessor to send cut-off signals control switch module fast shut-off current path to current detection module, thereby in test process, unit under test and test circuit have been realized to short circuit overcurrent protection fast, guarantee that unit under test and test circuit are not damaged and have further promoted production efficiency.
Accompanying drawing explanation
Fig. 1 is the modular structure figure of the short circuit overcurrent protective circuit that provides of the utility model embodiment;
Fig. 2 is the exemplary circuit structure chart of the short circuit overcurrent protective circuit that provides of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
The utility model comprises the short circuit overcurrent protective circuit of switch module, microprocessor, short circuit protection module and current detection module by employing; in test process, test circuit and unit under test have been realized to short circuit overcurrent protection fast, guaranteed that test circuit and unit under test are not damaged and have further promoted production efficiency.
Fig. 1 shows the modular structure of the short circuit overcurrent protective circuit that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant to the utility model, and details are as follows:
Short circuit overcurrent protective circuit 100 is connected with DC power supply 200, unit under test 300 and test circuit 400, and the input of unit under test 300 is connected to test with test circuit 400 with loop end.
Short circuit overcurrent protective circuit 100 comprises switch module 101, microprocessor 102, short circuit protection module 103 and current detection module 104.
The input of switch module 101 connects the output of DC power supply 200, the input of the input of short circuit protection module 103 and current detection module 104 is connected to the output of switch module 101 altogether, the output of current detection module 104 and loop input are connected respectively input and the loop end of unit under test 300, the voltage sample end of short circuit protection module 103 connects the loop output of current detection module 104, the loop end of short circuit protection module 103 connects the earth terminal of DC power supply 200, microprocessor 102 connects the first overcurrent feedback end and the second overcurrent feedback end of current detection module 104, microprocessor 102 is also connected with the control end of test circuit 400 and switch module 101.
When test circuit 400 starts unit under test 300 to test, by microprocessor 102, according to the operating state of test circuit 400, send Continuity signal control switch module 101 and keep conducting state, when there is short circuit in unit under test 300, short circuit protection module 103 correspondingly causes the output current of the output of switch module 101 earth terminal of DC power supply 200 according to the voltage of the loop output of current detection module 104, when there is overcurrent in the test loop of unit under test 300, current detection module 104 according to the electric current of the input of unit under test 300 and/or loop end correspondingly I/O abnormal signal and/or loop end abnormal signal to microprocessor 102, by microprocessor 102, send cut-off signals control switch module 101 again and cut off current path.
Therefore, in above-mentioned short circuit overcurrent protective circuit 100, the earth terminal (the earth terminal ground connection of DC power supply 200) that short circuit protection module 103 can be pulled to by force DC power supply 200 according to the voltage of the loop output of current detection module 104 by the output current of switch module 101 when short circuit appears in unit under test 300 is to realize short circuit abnormal protection, in addition, by switch module 101, also in the time of can there is overcurrent at the test loop of unit under test 300 in the current foldback circuit that microprocessor 102 and current detection module 104 form, according to the electric current of the input of unit under test 300 and/or loop end, by its inner embedding of microprocessor 102(, have software program) send cut-off signals control switch module 101 its inner current paths of cut-out to realize overcurrent protection, thereby can in test process, to unit under test 300 and test circuit 400, realize the short circuit overcurrent protection that software and hardware combines, and fast response time, be conducive to realize fast short circuit overcurrent protection action, thereby guarantee unit under test 300 and test circuit 400 and be not damaged.
Fig. 2 shows the exemplary circuit structure of the short circuit overcurrent protective circuit that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant to the utility model, and details are as follows:
As the utility model one embodiment, switch module 101 comprises the first diode D1 and relay K 1, the first common contact of controlling contact of the anode of the first diode D1 and relay K 1 is the control end of switch module 101, second of the negative electrode of the first diode D1 and relay K 1 controlled contact and connect altogether and access+5V voltage, the switch contact of relay K 1 and normally opened contact are respectively input and the output of switch module 101, or the normally opened contact of relay K 1 and switch contact are respectively input and the output (not shown in Fig. 2) of switch module 101.
As the utility model one embodiment, microprocessor 102 possesses the programmable logic device of mathematical logic disposal ability for single-chip microcomputer, arm processor or other.
As the utility model one embodiment, short circuit protection module 103 comprises:
The first resistance R 1, the second resistance R 2, the second diode D2, the 3rd resistance R 3, the first switching tube 1031, the 4th resistance R 4, the first voltage stabilizing didoe ZD1, the second voltage stabilizing didoe ZD2, the 5th resistance R 5 and second switch pipe 1032;
The first end of the first resistance R 1 is the input of short circuit protection module 103, the negative electrode of the second end of the first resistance R 1 and the first end of the second resistance R 2 and the second diode D2 is connected to the input of the first switching tube 1031 altogether, the output of the first switching tube 1031 is the loop end of short circuit protection module 103, the first end of the control end of the first switching tube 1031 and the 4th resistance R 4, the negative electrode of the first voltage stabilizing didoe ZD1 is connected to the first end of the 3rd resistance R 3 altogether, the second end of the second resistance R 2 and the anode of the second diode D2, the first end of the negative electrode of the second voltage stabilizing didoe ZD2 and the 5th resistance R 5 is connected to the control end of second switch pipe 1032 altogether, the second end of the 3rd resistance R 3 is the voltage sample end of short circuit protection module 103, the input of second switch pipe 1032 connects the second end of the 3rd resistance R 3, the second end of the 4th resistance R 4, the anode of the first voltage stabilizing didoe ZD1, the anode of the second voltage stabilizing didoe ZD2, the second end of the 5th resistance R 5 and the output of second switch pipe 1032 are connected to the output of the first switching tube 1031 altogether.
Wherein, the first resistance R 1 is preferably with the 3rd resistance R 3 resistance equating, the resistance sum of the first resistance R 1 and the second resistance R 2 is greater than the resistance of the 3rd resistance R 3, the first switching tube 1031 and second switch pipe 1032 can be triodes, metal-oxide-semiconductor or other possess the semiconductor device of switching characteristic, and the switching tube that the first switching tube 1031 and second switch pipe 1032 are same type, as shown in Figure 2, when the first switching tube 1031 and second switch pipe 1032 are respectively a NMOS pipe Q1 and the 2nd NMOS pipe Q2, the drain electrode of the one NMOS pipe Q1, source electrode and grid are respectively the input of the first switching tube 1031, output and control end, the drain electrode of the 2nd NMOS pipe Q2, source electrode and grid are respectively the input of second switch pipe 1032, output and control end.
In addition; the first voltage stabilizing didoe ZD1 and the second voltage stabilizing didoe ZD2 are respectively the first switching tube 1031 and second switch pipe 1032 provides voltage-stabilizing protection function, and the 4th resistance R 4 and the 5th resistance R 5 are respectively that the shunt resistance of overcurrent protection is provided for the first voltage stabilizing didoe ZD1 and the second voltage stabilizing didoe ZD2.
As the utility model one embodiment, current detection module 104 comprises:
The 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, the first capacitor C 1, the first optocoupler U1, the tenth resistance R the 10, the 11 resistance R the 11, the 12 resistance R the 12, the 13 resistance R 13, the second capacitor C 2 and the second optocoupler U2;
The first end of the 6th resistance R 6, the formed contact altogether of first end of the first end of the 8th resistance R 8 and the first capacitor C 1 is the input of current detection module 104, the second end of the second end of the 8th resistance R 8 and the first capacitor C 1 is connected to the anode of the light-emitting diode of the first optocoupler U1 altogether, the negative electrode of the second end of the 6th resistance R 6 and the light-emitting diode of the first optocoupler U1 is connected to the first end of the 7th resistance R 7 altogether, the second end of the 7th resistance R 7 is the output of current detection module 104, the common contact of the first end of the drain electrode of the phototriode of the first optocoupler U1 and the 9th resistance R 9 is the first overcurrent feedback end of current detection module 104, enter+5V of the second termination voltage of the 9th resistance R 9, the source electrode of the phototriode of the first optocoupler U1 connects signal ground (signal ground refers to the electronegative potential identical with the low level signal of microprocessor 102), the first end of the 11 resistance R 11 is the loop input of current detection module 104, the second end of the first end of the tenth resistance R 10 and the 11 resistance R 11 is connected to the anode of the light-emitting diode of the second optocoupler U2 altogether, the second end of the tenth resistance R 10, the formed contact altogether of first end of the first end of the 12 resistance R 12 and the second capacitor C 2 is the loop output of current detection module 104, the second end of the second end of the 12 resistance R 12 and the second capacitor C 2 is connected to the negative electrode of the light-emitting diode of the second optocoupler U2 altogether, the common contact of the drain electrode of the phototriode of the second optocoupler U2 and the first end of the 13 resistance R 13 is the second overcurrent feedback end of current detection module 104, enter+5V of the second termination voltage of the 13 resistance R 13, the source electrode of the phototriode of the second optocoupler U2 connects signal ground.
Below in conjunction with operation principle, above-mentioned short circuit overcurrent protective circuit 100 is described further:
For short circuit protection module 103, under normal circumstances, when circuit powers on, relay K 1 is closed conducting under the control of microprocessor 102, due to unit under test 300 in startup stage (being equivalent to open-circuit condition), now under the effect of the output voltage of DC power supply 200, by the first resistance R 1 and the rear grid source electrode parasitic capacitance to the 2nd NMOS pipe Q2 of the second resistance R 2, charge, make the grid voltage of the 2nd NMOS pipe Q2 rapidly increase to its conducting voltage, the 2nd NMOS pipe Q2 conducting, and its drain voltage is dragged down, and control a NMOS pipe Q1 maintenance off state by the 3rd resistance R 3.So now test circuit 400 normal operation, until test job completes, is then sent cut-off signals by microprocessor 102 and is disconnected relay K 1, and etc. pending test next time.When there is short circuit unusual condition in unit under test 300, when circuit powers on, relay K 1 is closed conducting under the control of microprocessor 102, because unit under test 300 is in short-circuit condition, during due to short circuit, the input of unit under test 300 and loop end be short circuit almost, the voltage of the loop output output of current sample module 104 can raise fast, because the resistance sum of the first resistance R 1 and the second resistance R 2 is greater than the resistance of the 3rd resistance R 3, the voltage of the 3rd resistance R 3 samplings raises, first make the grid voltage of a NMOS pipe Q1 raise, thereby make a NMOS pipe Q1 conducting (main current loop become be back to the earth terminal of DC power supply 200 from the first resistance R 1 by a NMOS pipe Q1), the drain voltage of a NMOS pipe Q1 be forced to be pulled low to (being connected with the earth terminal of DC power supply 200), and then by the second diode D2, the grid of the 2nd NMOS pipe Q2 is dragged down to close fast the current path at the 2nd NMOS pipe Q2 place in test loop, thereby play the object of quick protection test circuit.
For by switch module 101, the current foldback circuit that microprocessor 102 and current detection module 104 form, using the 7th resistance R 7 and the 11 resistance R 11 as power resistor, be concatenated into and in test loop, carry out current sample, when the electric current of flow through the 6th resistance R 6 and/or the tenth resistance R 10 is greater than setting electric current, the light-emitting diode meeting conducting of the light-emitting diode of the first optocoupler U1 and/or the second optocoupler U2, also conducting thereupon of the phototriode of the phototriode of the first optocoupler U1 and/or the second optocoupler U2, correspondingly, the drain voltage of the phototriode of the drain voltage of the phototriode of the first optocoupler U1 and/or the second optocoupler U2 can be dragged down, so the first overcurrent feedback end of current detection module 104 and/or the second overcurrent feedback end can become low level from high level, (the low level of the first overcurrent feedback end is aforesaid input abnormal signal, the low level of the second overcurrent feedback end is aforesaid loop end abnormal signal), the first overcurrent feedback end and the second overcurrent feedback end of 102 pairs of current detection modules 104 of microprocessor carry out real-time sampling, when sampled signal is low level, the test loop of judging unit under test occurs that overcurrent is abnormal, now microprocessor 102 sends 5V level signal (being cut-off signals) control relay K1 and turn-offs to cut off current path, thereby reach the object of protection unit under test 300 and test circuit 400.
Another object of the utility model embodiment is also to provide a kind of volume production testing equipment that comprises above-mentioned short circuit overcurrent protective circuit 100, and it comprises above-mentioned test circuit.
The utility model embodiment comprises switch module 101 by employing, microprocessor 102, the short circuit overcurrent protective circuit 100 of short circuit protection module 103 and current detection module 104, when there is short circuit in unit under test 300, short circuit protection module 103 correspondingly causes the output current of switch module 101 earth terminal of DC power supply 200 according to the voltage of the loop output of current detection module 104, when there is overcurrent in the test loop of unit under test 300, according to the electric current of the input of unit under test 300 and/or loop end, correspondingly I/O abnormal signal and/or loop end abnormal signal drive microprocessor 102 to send cut-off signals control switch module 101 fast shut-off current paths to current detection module 104, thereby in test process, unit under test 300 and test circuit 400 have been realized to short circuit overcurrent protection fast, guarantee that unit under test 300 and test circuit 400 are not damaged and have further promoted production efficiency.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (6)
1. a short circuit overcurrent protective circuit, is connected with DC power supply, unit under test and test circuit, and the input of described unit under test is connected to test with test circuit with loop end; It is characterized in that, described short circuit overcurrent protective circuit comprises:
Switch module, microprocessor, short circuit protection module and current detection module;
The input of described switch module connects the output of described DC power supply, the input of described short circuit protection module and the input of described current detection module are connected to the output of described switch module altogether, the output of described current detection module and loop input are connected respectively input and the loop end of described unit under test, the voltage sample end of described short circuit protection module connects the loop output of described current detection module, the loop end of described short circuit protection module connects the earth terminal of described DC power supply, described microprocessor connects the first overcurrent feedback end and the second overcurrent feedback end of described current detection module, described microprocessor is also connected with the control end of described test circuit and described switch module.
2. short circuit overcurrent protective circuit as claimed in claim 1, it is characterized in that, described switch module comprises the first diode D1 and relay, the control end that the first common contact of controlling contact of the anode of described the first diode D1 and described relay K 1 is described switch module, second of the negative electrode of described the first diode D1 and described relay controlled contact and connect altogether and access+5V voltage, the switch contact of described relay and normally opened contact are respectively input and the output of described switch module, or the normally opened contact of described relay and switch contact are respectively input and the output of described switch module.
3. short circuit overcurrent protective circuit as claimed in claim 1, is characterized in that, described short circuit protection module comprises:
The first resistance R 1, the second resistance R 2, the second diode D2, the 3rd resistance R 3, the first switching tube, the 4th resistance R 4, the first voltage stabilizing didoe ZD1, the second voltage stabilizing didoe ZD2, the 5th resistance R 5 and second switch pipe;
The first end of described the first resistance R 1 is the input of described short circuit protection module, the negative electrode of the second end of described the first resistance R 1 and the first end of described the second resistance R 2 and described the second diode D2 is connected to the input of described the first switching tube altogether, the output of described the first switching tube is the loop end of described short circuit protection module, the first end of the control end of described the first switching tube and described the 4th resistance R 4, the negative electrode of described the first voltage stabilizing didoe ZD1 is connected to the first end of described the 3rd resistance R 3 altogether, the second end of described the second resistance R 2 and the anode of described the second diode D2, the first end of the negative electrode of described the second voltage stabilizing didoe ZD2 and described the 5th resistance R 5 is connected to the control end of described second switch pipe altogether, the voltage sample end that the second end of described the 3rd resistance R 3 is described short circuit protection module, the input of described second switch pipe connects the second end of described the 3rd resistance R 3, the second end of described the 4th resistance R 4, the anode of described the first voltage stabilizing didoe ZD1, the anode of described the second voltage stabilizing didoe ZD2, the second end of described the 5th resistance R 5 and the output of described second switch pipe are connected to the output of described the first switching tube altogether.
4. short circuit overcurrent protective circuit as claimed in claim 3; it is characterized in that; described the first switching tube and second switch pipe are respectively a NMOS pipe and the 2nd NMOS pipe; the drain electrode of a described NMOS pipe, source electrode and grid are respectively input, output and the control end of described the first switching tube, and the drain electrode of described the 2nd NMOS pipe, source electrode and grid are respectively input, output and the control end of described second switch pipe.
5. short circuit overcurrent protective circuit as claimed in claim 1, is characterized in that, described current detection module comprises:
The 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, the first capacitor C 1, the first optocoupler, the tenth resistance R the 10, the 11 resistance R the 11, the 12 resistance R the 12, the 13 resistance R 13, the second capacitor C 2 and the second optocoupler;
The first end of described the 6th resistance R 6, the formed input that contact is described current detection module altogether of first end of the first end of described the 8th resistance R 8 and described the first capacitor C 1, the second end of the second end of described the 8th resistance R 8 and described the first capacitor C 1 is connected to the anode of the light-emitting diode of described the first optocoupler altogether, the negative electrode of the second end of described the 6th resistance R 6 and the light-emitting diode of described the first optocoupler is connected to the first end of described the 7th resistance R 7 altogether, the output that the second end of described the 7th resistance R 7 is described current detection module, the first overcurrent feedback end that the common contact of the first end of the drain electrode of the phototriode of described the first optocoupler and described the 9th resistance R 9 is described current detection module, enter+5V of the second termination voltage of described the 9th resistance R 9, the source electrode of the phototriode of described the first optocoupler connects signal ground, the first end of described the 11 resistance R 11 is the loop input of described current detection module, the second end of the first end of described the tenth resistance R 10 and described the 11 resistance R 11 is connected to the anode of the light-emitting diode of described the second optocoupler altogether, the second end of described the tenth resistance R 10, the formed loop output that contact is described current detection module altogether of first end of the first end of described the 12 resistance R 12 and described the second capacitor C 2, the second end of the second end of described the 12 resistance R 12 and described the second capacitor C 2 is connected to the negative electrode of the light-emitting diode of described the second optocoupler altogether, the second overcurrent feedback end that the common contact of the drain electrode of the phototriode of described the second optocoupler and the first end of described the 13 resistance R 13 is described current detection module, enter+5V of the second termination voltage of described the 13 resistance R 13, the source electrode of the phototriode of described the second optocoupler connects signal ground.
6. a volume production testing equipment, comprises test circuit, it is characterized in that, described volume production testing equipment also comprises the short circuit overcurrent protective circuit as described in claim 1 to 5 any one.
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| CN201320594273.4U CN203481783U (en) | 2013-09-25 | 2013-09-25 | Short circuit and overcurrent protection circuit and mass production test equipment |
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| CN201320594273.4U CN203481783U (en) | 2013-09-25 | 2013-09-25 | Short circuit and overcurrent protection circuit and mass production test equipment |
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| CN104535809A (en) * | 2014-12-24 | 2015-04-22 | 广东电网有限责任公司电力科学研究院 | Standard instrument protecting system capable of avoiding dangerous current signal damage |
| CN106469628A (en) * | 2015-08-17 | 2017-03-01 | 佛山市顺德区美的电热电器制造有限公司 | For the protection control method of relay, device |
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| CN104535809B (en) * | 2014-12-24 | 2017-05-03 | 广东电网有限责任公司电力科学研究院 | Standard instrument protecting system capable of avoiding dangerous current signal damage |
| CN104535809A (en) * | 2014-12-24 | 2015-04-22 | 广东电网有限责任公司电力科学研究院 | Standard instrument protecting system capable of avoiding dangerous current signal damage |
| CN106469628A (en) * | 2015-08-17 | 2017-03-01 | 佛山市顺德区美的电热电器制造有限公司 | For the protection control method of relay, device |
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| CN109245032B (en) * | 2018-10-31 | 2024-04-19 | 惠州三华工业有限公司 | Overcurrent protection circuit and direct-current power supply system |
| CN109687387A (en) * | 2018-11-05 | 2019-04-26 | 贵州航天电器股份有限公司 | A kind of current foldback circuit |
| CN109687387B (en) * | 2018-11-05 | 2020-05-08 | 上海威克鲍尔通信科技有限公司 | Overcurrent protection circuit |
| CN112925683B (en) * | 2021-01-25 | 2022-04-26 | 长鑫存储技术有限公司 | Test board |
| CN112925683A (en) * | 2021-01-25 | 2021-06-08 | 长鑫存储技术有限公司 | Test board |
| CN113363943B (en) * | 2021-05-17 | 2022-06-07 | 深圳易马达科技有限公司 | Overcurrent protection circuit of battery and power supply equipment |
| CN113363943A (en) * | 2021-05-17 | 2021-09-07 | 深圳易马达科技有限公司 | Overcurrent protection circuit of battery and power supply equipment |
| CN113295957B (en) * | 2021-06-04 | 2023-03-10 | 基合半导体（宁波）有限公司 | Test control device, method and micro control unit |
| CN113295957A (en) * | 2021-06-04 | 2021-08-24 | 基合半导体（宁波）有限公司 | Test control device, method and micro control unit |
| CN114578216A (en) * | 2022-04-30 | 2022-06-03 | 南昌耀德精密五金有限公司 | Conducting device for chip test |
| CN114578216B (en) * | 2022-04-30 | 2022-07-15 | 南昌耀德精密五金有限公司 | Conducting device for chip test |
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Address after: 261061, Shandong 155 high tech Zone, Weifang, No. two, No. 3, 1st accelerator, 1st floor Patentee after: SHANDONG ZM SEMICONDUCTOR TECHNOLOGY Co.,Ltd. Address before: 261061, Shandong 155 high tech Zone, Weifang, No. two, No. 3, 1st accelerator, 1st floor Patentee before: SHANDONG ZHENMING OPTOTECH CO.,LTD. |
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Granted publication date: 20140312 |
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| CX01 | Expiry of patent term |