CN205121401U - Electric current source suitable for big current power device testing arrangement - Google Patents
Electric current source suitable for big current power device testing arrangement Download PDFInfo
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- CN205121401U CN205121401U CN201520732003.4U CN201520732003U CN205121401U CN 205121401 U CN205121401 U CN 205121401U CN 201520732003 U CN201520732003 U CN 201520732003U CN 205121401 U CN205121401 U CN 205121401U
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Abstract
The utility model discloses an electric current source suitable for big current power device testing arrangement, including host computer, integral control circuit, constant -current source circuit, power amplifier circuit and feedback circuit, the input of integral control circuit is connected with host computer and feedback circuit's output electricity respectively, and the output of integral control circuit is connected with the input of constant -current source circuit electricity, and the output of constant -current source circuit is connected with power amplifier circuit's input, and power amplifier circuit's output is connected with feedback circuit's input electricity. The utility model has the characteristics of when the response speed who promotes the electric current source follower, can restrain the overshoot owing to response speed arouses at the excessive speed and probably.
Description
Technical field
The utility model relates to ic test technique field, refers in particular to a kind of current source being applicable to super-current power unit proving installation exporting fast response time.
Background technology
When carrying out the pulse test of big current parameter, there is requirement to the pulse signal of current source.Because the junction temperature of transistor is very large on parameter testing impact, and junction temperature and time are positively related, and especially after 300us, the junction temperature of transistor acutely rises.Therefore, American army mark specifies, pulse test need complete the test of big current parameter in 250us, and GB and national military standard also predetermined pulse test need complete the test of big current parameter in 300us.And typical big current parameter testing set of time is at 380us.Therefore, the output response time of current source within 300us, need could meet the demand of parameter testing.
But there is the slow defect of output response speed in more than the 200A current source of prior art.
Chinese patent mandate publication number: CN102622030A, authorize publication date on August 1st, 2012, disclose a kind of current source circuit with temperature compensation, the described current source circuit with temperature compensation comprises a power end, the one reference current source unit be connected with described power end, one feedback control unit be connected with described power end and described reference current source unit, the one current source generation unit be connected with described feedback control unit and an earth terminal be connected with described current source generation unit, described reference current source unit is a current source be connected with described power end, described feedback control unit comprise first on-off element and be connected with one end of described current source be connected between the other end of described current source and described first on-off element sign-changing amplifier.The weak point of this invention is, current source circuit exists the slow deficiency of output response speed.
Summary of the invention
Goal of the invention of the present utility model exports the slow deficiency of response speed to overcome more than 200A current source of the prior art, provides a kind of current source being applicable to super-current power unit proving installation exporting fast response time.
To achieve these goals, the utility model is by the following technical solutions:
Be applicable to a current source for super-current power unit proving installation, comprise host computer, integral control circuit, constant-current source circuit, power amplifier and feedback circuit; The input end of integral control circuit is electrically connected with the output terminal of host computer and feedback circuit respectively, the output terminal of integral control circuit is electrically connected with the input end of constant-current source circuit, the output terminal of constant-current source circuit is connected with the input end of power amplifier, and the output terminal of power amplifier is electrically connected with the input end of feedback circuit.
The output signal that host computer exports an offset signal and feedback circuit carries out differential comparison, differential signal is as the input of integral control circuit, differential signal is carried out integration by integral control circuit, and as the input of constant-current source circuit, the output of constant current source drives power amplifier, power amplifier exports and increases, the output signal of feedback circuit also increases thereupon, and differential signal reduces, until differential signal is zero, the output of integral control circuit reaches balance, and power amplifier exports also to be stablized thereupon.
When electric current export response speed do not reach require time, by regulating some parameter of integral control circuit and constant-current source circuit, realizing response speed and promoting, and stablely to export.
Therefore, when the utility model has the response speed exported in motor current source, can suppress too fast due to response speed and the feature of overshoot that may cause.
As preferably, described integral control circuit comprises amplifier U12, electric capacity C6, resistance R2, resistance R3, resistance R4, resistance R6 and resistance R10, resistance R2 one end is electrically connected with resistance R3 one end, the resistance R3 other end is electrically connected with the inverting input of resistance R6 one end and amplifier U12 respectively, resistance R4 one end ground connection, the resistance R4 other end is electrically connected with the normal phase input end of amplifier U12, electric capacity C6 one end is electrically connected with the resistance R6 other end, the electric capacity C6 other end is electrically connected with the output terminal of amplifier U12 and resistance R10 one end respectively, the resistance R10 other end is electrically connected with constant-current source circuit.
As preferably, described constant-current source circuit comprises triode T1, forward output circuit and negative sense output circuit; Triode T1 is electrically connected with forward output circuit and negative sense output circuit respectively, and the output terminal of forward output circuit and negative sense output circuit is all electrically connected with power amplifier.
As preferably, described feedback circuit comprises resistance R20, resistance R26, resistance R24, resistance R25, resistance R30 and resistance R31, discharger U13, discharger U14 and discharger U15;
Resistance R20 is all connected with power amplifier with resistance R26 one end, the resistance R20 other end is electrically connected with the in-phase input end of discharger U13, the inverting input of discharger U13 and output terminal are all electrically connected with resistance R24 one end, the resistance R24 other end is electrically connected with the inverting input of resistance R25 one end and discharger U15 respectively, the in-phase input end ground connection of discharger U15, the output terminal of the resistance R25 other end and discharger U15 is all electrically connected with resistance R31 one end; The resistance R26 other end is electrically connected with the in-phase input end of amplifier U14, and the inverting input of amplifier U14 and output terminal are all electrically connected with resistance R30 one end, and resistance R30 and the resistance R31 other end are all electrically connected with the resistance R2 other end.
As preferably, also comprise resistance R32, resistance R33 and resistance R36, discharger U16, switch U17C and switch U17D; Resistance R30 and the resistance R31 other end are all electrically connected with the inverting input of resistance R32 one end, resistance R33 one end and amplifier U16, the in-phase input end ground connection of amplifier U16, the output terminal of amplifier U16 is electrically connected with resistance R36 one end, the resistance R32 other end is electrically connected with switch U17D one end, the resistance R33 other end is electrically connected with switch U17C one end, and switch U17C, switch U17D and the R36 other end are all electrically connected with the R2 other end.
As preferably, power amplifier comprises forward amplifying circuit and the negative sense amplifying circuit of electrical connection, and forward amplifying circuit and negative sense amplifying circuit include the triode of several parallel connections.
Therefore, the utility model has following beneficial effect: during the response speed exported in motor current source, can suppress too fast due to response speed and overshoot that is that may cause.
Accompanying drawing explanation
Fig. 1 is a kind of theory diagram of the present utility model;
Fig. 2 is a kind of integral control circuit of the present utility model and constant-current source circuit figure;
Fig. 3 is a kind of power amplifier figure of the present utility model;
Fig. 4 is a kind of feedback circuit figure of the present utility model.
In figure: host computer 1, integral control circuit 2, constant-current source circuit 3, power amplifier 4, feedback circuit 5, forward output circuit 6, negative sense output circuit 7, forward amplifying circuit 8, negative sense amplifying circuit 9.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is further described.
Embodiment is as shown in Figure 1 a kind of current source being applicable to super-current power unit proving installation, comprises host computer 1, integral control circuit 2, constant-current source circuit 3, power amplifier 4 and feedback circuit 5; The input end of integral control circuit is electrically connected with the output terminal of host computer and feedback circuit respectively, the output terminal of integral control circuit is electrically connected with the input end of constant-current source circuit, the output terminal of constant-current source circuit is connected with the input end of power amplifier, and the output terminal of power amplifier is electrically connected with the input end of feedback circuit.
As shown in Figure 2, integral control circuit comprises amplifier U12, electric capacity C6, resistance R2, resistance R3, resistance R4, resistance R6 and resistance R10, resistance R2 one end is electrically connected with resistance R3 one end, the resistance R3 other end is electrically connected with the inverting input of resistance R6 one end and amplifier U12 respectively, resistance R4 one end ground connection, the resistance R4 other end is electrically connected with the normal phase input end of amplifier U12, electric capacity C6 one end is electrically connected with the resistance R6 other end, the electric capacity C6 other end is electrically connected with the output terminal of amplifier U12 and resistance R10 one end respectively, the resistance R10 other end is electrically connected with constant-current source circuit.
Constant-current source circuit comprises triode T1, forward output circuit 6 and negative sense output circuit 7; Triode T1 is electrically connected with forward output circuit and negative sense output circuit respectively, and the output terminal of forward output circuit and negative sense output circuit is all electrically connected with power amplifier.
As shown in Figure 4, feedback circuit comprises resistance R20, resistance R26, resistance R24, resistance R25, resistance R30 and resistance R31, discharger U13, discharger U14 and discharger U15;
Resistance R20 is all connected with power amplifier with resistance R26 one end, the resistance R20 other end is electrically connected with the in-phase input end of discharger U13, the inverting input of discharger U13 and output terminal are all electrically connected with resistance R24 one end, the resistance R24 other end is electrically connected with the inverting input of resistance R25 one end and discharger U15 respectively, the in-phase input end ground connection of discharger U15, the output terminal of the resistance R25 other end and discharger U15 is all electrically connected with resistance R31 one end; The resistance R26 other end is electrically connected with the in-phase input end of amplifier U14, and the inverting input of amplifier U14 and output terminal are all electrically connected with resistance R30 one end, and resistance R30 and the resistance R31 other end are all electrically connected with the resistance R2 other end.
Also comprise resistance R32, resistance R33 and resistance R36, discharger U16, switch U17C and switch U17D; Resistance R30 and the resistance R31 other end are all electrically connected with the inverting input of resistance R32 one end, resistance R33 one end and amplifier U16, the in-phase input end ground connection of amplifier U16, the output terminal of amplifier U16 is electrically connected with resistance R36 one end, the resistance R32 other end is electrically connected with switch U17D one end, the resistance R33 other end is electrically connected with switch U17C one end, and switch U17C, switch U17D and the R36 other end are all electrically connected with the R2 other end.
As shown in Figure 3, power amplifier comprises forward amplifying circuit 8 and the negative sense amplifying circuit 9 of electrical connection, and forward amplifying circuit and negative sense amplifying circuit include 22 triodes in parallel.
Integral control circuit is that input signal is carried out integration to the time, as long as input signal exists always, the output of integrating circuit will continue to increase.
The most basic integral control circuit, output signal all increases from 0.In the current source of big current, arrive the stable time to shorten integral control circuit, the electric capacity C6 of the feedback branch of amplifier has connected a resistance R6.After increasing this resistance, output voltage then can increase from a non-zero value.The response speed of integral control circuit but the setting of resistance R6 has also been slowed down, has the effect of Reducing overshoot.The output of integral control circuit receives constant-current source circuit by a triode T1.The forward triode T2 of constant-current source circuit passes through the indirect diode D7 at BE, and at E pole connecting resistance R15.When working on power, the PN junction forward conduction between BE, diode D7 also forward conduction.Namely the forward conduction voltage drop that the forward conduction voltage drop of diode deducts PN junction between BE is the pressure drop at E electrode resistance R15 two ends, therefore determines the electric current of E pole.The electric current of constant current source determines the maximum current fan-out capability of current module.
As shown in Figure 3, the output of constant-current source circuit connects power amplifier, and power amplifier is the mode adopting multiple triode parallel connection, is amplified by the output current of constant current source.The power amplifier simplicity of design of triode, and output current is larger.Because what select is Low-frequency and High-power Transistor, and progression in parallel is more, so longer in the response time of power amplifier part.
As shown in Figure 4, the output of power amplifier connects sampling resistor, and sampling resistor converts output current to voltage, sampling resistor two ends access backfeed loop.The principle of work of backfeed loop is based on high pressure follow circuit and scaling circuit, by the voltage at sampling resistor two ends, according to the amplification coefficient of different gear, finally exports the voltage of-10V ~ 10V.
The response speed of current source is mainly by the impact of the response speed of integral control circuit, the response speed of power amplifier triode, the response speed of backfeed loop, wherein the response speed of integral control circuit accounts for topmost part, next is the response speed of triode, and the response speed impact of backfeed loop is not very large.Therefore, the speed-raising of current source just concentrates on the design of integrating circuit and the determination of triode operation state.
To raise speed with the suppression of overshoot normally will together with complete, this due to response speed and overshoot be relevant, response speed is faster, more easily causes overshoot.So, while response speed is risen to a certain degree, need to be suppressed overshoot, and Reducing overshoot can reduce response speed, will find an equilibrium point between the two, make to restrain overshoot under the condition meeting response speed requirement.
Debug process of the present utility model is as follows:
Keep R5 constant, reduce C6 and promote below response speed to re-set target, if there is overshoot, then increase R6 to suppress, and maintain response speed within requiring, if overshoot still can not be suppressed, then reduce R12 and carry out Reducing overshoot, when the reduction of R12 causes the problem of fan-out capability deficiency, then reduce R15 and carry out motor current fan-out capability.
Should be understood that the present embodiment is only not used in restriction scope of the present utility model for illustration of the utility model.In addition should be understood that those skilled in the art can make various changes or modifications the utility model, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the utility model instruction.
Claims (6)
1. one kind is applicable to the current source of super-current power unit proving installation, it is characterized in that, comprise host computer (1), integral control circuit (2), constant-current source circuit (3), power amplifier (4) and feedback circuit (5); The input end of integral control circuit is electrically connected with the output terminal of host computer and feedback circuit respectively, the output terminal of integral control circuit is electrically connected with the input end of constant-current source circuit, the output terminal of constant-current source circuit is connected with the input end of power amplifier, and the output terminal of power amplifier is electrically connected with the input end of feedback circuit.
2. the current source being applicable to super-current power unit proving installation according to claim 1, it is characterized in that, described integral control circuit comprises amplifier U12, electric capacity C6, resistance R2, resistance R3, resistance R4, resistance R6 and resistance R10, resistance R2 one end is electrically connected with resistance R3 one end, the resistance R3 other end is electrically connected with the inverting input of resistance R6 one end and amplifier U12 respectively, resistance R4 one end ground connection, the resistance R4 other end is electrically connected with the normal phase input end of amplifier U12, electric capacity C6 one end is electrically connected with the resistance R6 other end, the electric capacity C6 other end is electrically connected with the output terminal of amplifier U12 and resistance R10 one end respectively, the resistance R10 other end is electrically connected with constant-current source circuit.
3. the current source being applicable to super-current power unit proving installation according to claim 1, is characterized in that, described constant-current source circuit comprises triode T1, forward output circuit (6) and negative sense output circuit (7); Triode T1 is electrically connected with forward output circuit and negative sense output circuit respectively, and the output terminal of forward output circuit and negative sense output circuit is all electrically connected with power amplifier.
4. the current source being applicable to super-current power unit proving installation according to claim 2, it is characterized in that, described feedback circuit comprises resistance R20, resistance R26, resistance R24, resistance R25, resistance R30 and resistance R31, discharger U13, discharger U14 and discharger U15;
Resistance R20 is all connected with power amplifier with resistance R26 one end, the resistance R20 other end is electrically connected with the in-phase input end of discharger U13, the inverting input of discharger U13 and output terminal are all electrically connected with resistance R24 one end, the resistance R24 other end is electrically connected with the inverting input of resistance R25 one end and discharger U15 respectively, the in-phase input end ground connection of discharger U15, the output terminal of the resistance R25 other end and discharger U15 is all electrically connected with resistance R31 one end; The resistance R26 other end is electrically connected with the in-phase input end of amplifier U14, and the inverting input of amplifier U14 and output terminal are all electrically connected with resistance R30 one end, and resistance R30 and the resistance R31 other end are all electrically connected with the resistance R2 other end.
5. the current source being applicable to super-current power unit proving installation according to claim 4, is characterized in that, also comprises resistance R32, resistance R33 and resistance R36, discharger U16, switch U17C and switch U17D; Resistance R30 and the resistance R31 other end are all electrically connected with the inverting input of resistance R32 one end, resistance R33 one end and amplifier U16, the in-phase input end ground connection of amplifier U16, the output terminal of amplifier U16 is electrically connected with resistance R36 one end, the resistance R32 other end is electrically connected with switch U17D one end, the resistance R33 other end is electrically connected with switch U17C one end, and switch U17C, switch U17D and the R36 other end are all electrically connected with the R2 other end.
6. the current source being applicable to super-current power unit proving installation according to claim 1 or 2 or 3 or 4 or 5, it is characterized in that, power amplifier comprises forward amplifying circuit (8) and the negative sense amplifying circuit (9) of electrical connection, and forward amplifying circuit and negative sense amplifying circuit include the triode of several parallel connections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520732003.4U CN205121401U (en) | 2015-09-21 | 2015-09-21 | Electric current source suitable for big current power device testing arrangement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520732003.4U CN205121401U (en) | 2015-09-21 | 2015-09-21 | Electric current source suitable for big current power device testing arrangement |
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| Publication Number | Publication Date |
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| CN205121401U true CN205121401U (en) | 2016-03-30 |
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| CN201520732003.4U Active CN205121401U (en) | 2015-09-21 | 2015-09-21 | Electric current source suitable for big current power device testing arrangement |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107707257A (en) * | 2017-10-13 | 2018-02-16 | 沃尔特电子（苏州）有限公司 | A kind of numerical control electric current converting system using decoding schema in parallel |
| CN111835356A (en) * | 2019-04-18 | 2020-10-27 | 宁波飞芯电子科技有限公司 | Ramp generator, analog-to-digital converter and control method for generating ramp signal |
-
2015
- 2015-09-21 CN CN201520732003.4U patent/CN205121401U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107707257A (en) * | 2017-10-13 | 2018-02-16 | 沃尔特电子（苏州）有限公司 | A kind of numerical control electric current converting system using decoding schema in parallel |
| CN107707257B (en) * | 2017-10-13 | 2021-02-26 | 沃尔特电子（苏州）有限公司 | Numerical control current conversion system adopting parallel decoding mode |
| CN111835356A (en) * | 2019-04-18 | 2020-10-27 | 宁波飞芯电子科技有限公司 | Ramp generator, analog-to-digital converter and control method for generating ramp signal |
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