CN204314348U - A kind of high voltage and constant current electronic load circuit - Google Patents
A kind of high voltage and constant current electronic load circuit Download PDFInfo
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- CN204314348U CN204314348U CN201420477653.4U CN201420477653U CN204314348U CN 204314348 U CN204314348 U CN 204314348U CN 201420477653 U CN201420477653 U CN 201420477653U CN 204314348 U CN204314348 U CN 204314348U
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Abstract
The utility model discloses a kind of high voltage and constant current electronic load circuit, comprise control circuit and load blocks.Load blocks comprises the second load blocks and some the first load blocks be connected in parallel with the second load blocks; Control circuit comprises: operating voltage enable circuits, current sample amplifying circuit, error amplifier circuit, pulse modulated circuit and emitter follower.The utility model utilizes control circuit to ensure that utility model works is in constant current state, utilize load blocks adjustable to realize its withstand voltage adjustable to adapt to different working environments.In practice, only need the withstand voltage of regulating load number of modules and adjustable whole load circuit, to make this load circuit works in 10,000 volts even hyperbaric environment of 20,000 volts.Have the advantages that circuit is simple, reliable and stable, easy to use.
Description
Technical field
The utility model relates to a kind of high voltage and constant current electronic load circuit.
Background technology
DC high-voltage power supply is applied in each class of electronic devices, as vacuum coating electron gun, microwave electrovacuum travelling-wave tube, photomultiplier, high-voltage arc bonding machine etc.But this kind equipment is owing to being produce the product of DC high-voltage, belongs to high-risk source, in its production, research and development, debugging, use load for testing than indispensable.Conventional electronic load mainly uses powerful high-tension resistive to correspond to test voltage, electric current, is combined into specific resistance value and certain power by serial or parallel connection.Namely existing electronic load withstand voltage is non-adjustable, and same group of electronic load can not be common in the power supply of different voltage and different capacity, and its resource utilization is lower.As used the withstand voltage maximum operating voltage of ordinary electronic load to arrive 800V, cannot be applied in 10,000 volts even hyperbaric environment of 20,000 volts.
Utility model content
The purpose of this utility model is to provide a kind of high voltage and constant current electronic load circuit, to solve the nonadjustable problem of existing electronic load withstand voltage.
For solving the problems of the technologies described above, the utility model provides a kind of high voltage and constant current electronic load circuit, comprises control circuit and load circuit, and load circuit comprises the second load blocks and some the first load blocks be connected in parallel with the second load blocks; Control circuit comprises: operating voltage enable circuits, current sample amplifying circuit, error amplifier circuit, pulse modulated circuit and emitter follower; Operating voltage enable circuits is connected with load circuit, current sample amplifying circuit and pulse modulated circuit respectively; Current sample amplifying circuit is connected with load circuit, error amplifier circuit, pulse modulated circuit and emitter follower respectively; Error amplifier circuit is connected with institute's pulse modulated circuit and emitter follower respectively; Emitter follower is connected with load circuit.
Further, the first load blocks comprises equalizer circuit unit and load unit; Load unit comprises the first field effect transistor, the first resistance, the second resistance and the first voltage stabilizing diode; The drain electrode of the first field effect transistor is connected with one end of the first resistance, and the grid of the first field effect transistor is connected with the negative electrode of the first voltage stabilizing diode and one end of the second resistance respectively, and the source electrode of the first field effect transistor is connected with the anode of the first voltage stabilizing diode; Equalizer circuit comprises the 3rd resistance and the first electric capacity; One end of 3rd resistance is connected with the other end of the second resistance, and the other end of the 3rd resistance is connected with adjacent first load blocks of its parallel connection; First Capacitance parallel connection is in the 3rd resistance two ends.
Further, the second load blocks comprises the second field effect transistor, the second voltage stabilizing diode, the second electric capacity, the 4th resistance, the 5th resistance, the first sampling resistor and the second sampling resistor; The drain electrode of the second field effect transistor is connected with one end of the 4th resistance, and the other end of the 4th resistance is connected to the source electrode of the first field effect transistor; The grid of the second field effect transistor is connected with the negative electrode of the second voltage stabilizing diode; The source electrode of the second field effect transistor is connected with one end of the first sampling resistor; One end of 5th resistance is connected with one end of the 3rd resistance, and the other end of the 5th resistance is connected with one end of the second sampling resistor; One end of second electric capacity is connected with the first electric capacity; The other end of the other end of the first sampling resistor, the anode of the second voltage stabilizing diode, the second sampling resistor and the equal ground connection of the other end of the second electric capacity.
Further, operating voltage enable circuits comprises return difference comparer and the first field effect transistor photoelectrical coupler; First field effect transistor photoelectrical coupler comprises the first light emitting diode and the first phototransistor; Return difference comparer comprises the first operational amplifier, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance and the tenth resistance; One end of 6th resistance is connected with the reverse input end of the first operational amplifier, and the other end is connected between the second sampling resistor and the 5th resistance; One end of 7th resistance is connected to the normal phase input end of the first operational amplifier, and the other end is connected with the first reference voltage source; The output terminal of the first operational amplifier is connected to the anode of the first light emitting diode through the 8th resistance that is connected in series and the 9th resistance; One end of tenth resistance is connected to the positive input of the first operational amplifier, and the other end is connected between the 8th resistance and the 9th resistance; The positive power source terminal of the first operational amplifier is connected with the positive pole of the first power supply and the collector of the first phototransistor respectively.
Further, current sample amplifying circuit comprises the second operational amplifier, the first diode, the second diode, the 11 resistance, the 12 resistance, the 13 resistance and the 14 resistance; The positive input of the second operational amplifier is connected with the emitter of the first phototransistor through the 11 resistance, and the positive input of the second operational amplifier is connected between the source electrode of the first sampling resistor and the second field effect transistor through the 12 resistance; Be connected with the 13 resistance between the inverting input of the second operational amplifier and its output terminal, one end of the 14 resistance is connected with the inverting input of the second operational amplifier, other end ground connection; The anode of the first diode is connected with the positive input of the second operational amplifier respectively with the negative electrode of the second diode; The negative electrode of the first diode is connected to the positive power source terminal of the second operational amplifier, the plus earth of the second diode.
Further, error amplifying circuit comprises the 3rd operational amplifier, the 3rd electric capacity, slide rheostat and the second reference voltage source; The reverse input end of the 3rd operational amplifier is connected through the output terminal of the 15 resistance with the 3rd operational amplifier, is connected with the 3rd electric capacity between the inverting input of the 3rd operational amplifier and output terminal; The positive input of the 3rd operational amplifier is connected with the intermediate ends of slide rheostat; One end of slide rheostat is connected with reference power supply, the other end ground connection of slide rheostat.
Further, emitter follower comprises the first triode, the 16 resistance and the 17 resistance; The base stage of the first triode is connected to the output terminal of the 3rd operational amplifier through the 16 resistance; The collector of the first triode is connected to the positive power source terminal of the second operational amplifier; The emitter of the first triode is through the 17 resistance eutral grounding; The emitter of the first triode is connected with one end of the 17 resistance and the base stage of the second field effect transistor respectively.
Further, pulse modulated circuit comprises the second field effect transistor photoelectrical coupler, the second triode, the 18 resistance, the 19 resistance, the 20 resistance and switch; Second field effect transistor photoelectrical coupler comprises luminous second light emitting diode and the second phototransistor; The collector of the second phototransistor is connected with the positive power source terminal of the second operational amplifier and one end of the 18 resistance respectively; The emitter of the second phototransistor is connected to the inverting input of the 3rd operational amplifier through the 19 resistance; The other end of the 18 resistance is connected with the anode of the second light emitting diode; The negative electrode of the second light emitting diode is connected with the collector of the second triode; The base stage of the second triode is connected to the positive power source terminal of the first operational amplifier through the 20 resistance, and is provided with a switch between the 20 resistance and the positive power source terminal of the first operational amplifier; The grounded emitter of the second triode.
Further, the first field effect transistor and the second field effect transistor are N-MOSFET.
Further, the first triode and the second triode are NPN type triode.
The beneficial effects of the utility model are: the utility model utilizes control circuit to ensure that utility model works is in constant current state, utilize the first load blocks adjustable to realize its withstand voltage adjustable to adapt to different working environments.In practice, only need regulate the withstand voltage of its first load blocks number and adjustable whole load again, be operated in 10,000 volts even hyperbaric environment of 20,000 volts to make this high voltage and constant current electronic load circuit.Have the advantages that circuit is simple, reliable and stable, easy to use.
Accompanying drawing explanation
Fig. 1 is the schematic block circuit diagram of the utility model most preferred embodiment;
Fig. 2 is the circuit diagram of the utility model most preferred embodiment.
Embodiment
Below embodiment of the present utility model is described; so that those skilled in the art understand the utility model; but should be clear; the utility model is not limited to the scope of embodiment; to those skilled in the art; as long as various change to limit and in the spirit and scope of the present utility model determined, these changes are apparent, and all innovation and creation utilizing the utility model to conceive are all at the row of protection in appended claim.
A kind of high voltage and constant current electronic load circuit, comprise control circuit and load circuit, load circuit comprises the second load blocks and some the first load blocks be connected in parallel with the second load blocks; Control circuit comprises: operating voltage enable circuits, current sample amplifying circuit, error amplifier circuit, pulse modulated circuit and emitter follower; Operating voltage enable circuits is connected with load circuit, current sample amplifying circuit and pulse modulated circuit respectively; Current sample amplifying circuit is connected with load circuit, error amplifier circuit, pulse modulated circuit and emitter follower respectively; Error amplifier circuit is connected with institute's pulse modulated circuit and emitter follower respectively; Emitter follower is connected with load circuit.
First load blocks comprises equalizer circuit unit and load unit; Load unit comprises the first field effect transistor Q1, the first resistance R1, the second resistance R2 and the first voltage stabilizing diode VT1; The drain electrode of the first field effect transistor Q1 is connected with one end of the first resistance R1, the grid of the first field effect transistor Q1 is connected with the negative electrode of the first voltage stabilizing diode VT1 and one end of the second resistance R2 respectively, and the source electrode of the first field effect transistor Q1 is connected with the anode of the first voltage stabilizing diode VT1; Equalizer circuit comprises the 3rd resistance R3 and the first electric capacity C11; One end of 3rd resistance R3 is connected with the other end of the second resistance R2, and the other end of the 3rd resistance R3 is connected with adjacent described first load blocks of described first load blocks parallel connection; First electric capacity C1 is parallel to the 3rd resistance R3 two ends.
Wherein the first field effect transistor Q1 connects as load with the first resistance R1, and the second resistance provides controllable voltage for the grid of the first field effect transistor, and the first stabilivolt VT1 prevents its overvoltage for the protection of the first field effect transistor Q1 grid.
Second load blocks comprises the second field effect transistor Q2, the second voltage stabilizing diode VT2, the second electric capacity C2, the 4th resistance R4, the 5th resistance R5, the first sampling resistor R01 and the second sampling resistor R02.The drain electrode of the second field effect transistor Q1 is connected with one end of the 4th resistance R4, and the other end of the 4th resistance R4 is connected to the source electrode of the first field effect transistor Q1; The grid of the second field effect transistor Q2 is connected with the negative electrode of the second voltage stabilizing diode VT2; The source electrode of the second field effect transistor Q2 is connected with one end of the first sampling resistor R01; One end of 5th resistance R5 is connected with one end of the 3rd resistance R3, and the other end of the 5th resistance R5 is connected with one end of the second sampling resistor R02; One end of second electric capacity C2 is connected with the first electric capacity C1; The other end of the first sampling resistor R01, the anode of the second voltage stabilizing diode VT2, the other end of the second sampling resistor R02 and the equal ground connection of the other end of the second electric capacity C2.
Wherein, the 4th resistance R4 connects as load with the second field effect transistor Q2, and the second stabilivolt VT2 prevents its overvoltage for the protection of the first field effect transistor Q1 grid.First sampling resistor R01 is used for providing sampled voltage, and the second sampling resistor R02 is used for providing sample rate current.
Operating voltage enable circuits comprises return difference comparer and the first field effect transistor photoelectrical coupler G1.First field effect transistor photoelectrical coupler G1 comprises the first light emitting diode and the first phototransistor; Return difference comparer comprises the first operational amplifier A 1, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, the 9th resistance R9 and the tenth resistance R10; One end of 6th resistance R6 is connected with the reverse input end of the first operational amplifier A 1, and the other end is connected between the second sampling resistor R02 and the 5th resistance R5; One end of 7th resistance R7 is connected to the normal phase input end of the first operational amplifier A 1, and the other end is connected with the first reference voltage source V11; The output terminal of the first operational amplifier A 1 is connected to the anode of the first light emitting diode through the 8th resistance R8 that is connected in series and the 9th resistance R9; One end of tenth resistance R10 is connected to the positive input of the first operational amplifier A 1, and the other end is connected between the 8th resistance R8 and the 9th resistance R9; The positive power source terminal of the first operational amplifier A 1 is connected with the positive pole of the first power supply V21 and the collector of the first phototransistor respectively.
Operating voltage enable circuits principle of work: obtain sampled voltage on the second sampling resistor R02, and the power supply that sampled voltage and reference power supply V11 provide is entered respectively the first operational amplifier A 1 put to input end and positive input, when reverse input end voltage is greater than positive input voltage, the first operational amplifier exports noble potential.Otherwise, then electronegative potential is exported.Its output potential is by being connected to the anode tap of the first light emitting diode after the 6th resistance R6 current limliting.When the first operational amplifier exports noble potential, the first LEDs ON is luminous, i.e. the emitter and collector conducting of the first phototransistor, can carry out work by enable late-class circuit after the first power supply V21 connects the 11st resistance.
Current sample amplifying circuit comprises the second operational amplifier A 2, first diode D1, the second diode D2, the 11 resistance R11, the 12 resistance R12, the 13 resistance R13 and the 14 resistance R14; The positive input of the second operational amplifier A 2 is connected with the emitter of the first phototransistor through the 11 resistance R11, and the positive input of the second operational amplifier A 2 is connected between the first sampling resistor R01 and the source electrode of the second field effect transistor Q2 through the 12 resistance R12; Be connected with the 13 resistance R13 between the inverting input of the second operational amplifier A 2 and its output terminal, one end of the 14 resistance R14 is connected with the inverting input of the second operational amplifier A 2, other end ground connection; The anode of the first diode D1 is connected with the positive input of the second operational amplifier A 2 respectively with the negative electrode of the second diode D2; The negative electrode of the first diode D1 is connected to the positive power source terminal of the second operational amplifier A 2, the plus earth of the second diode D2.
Current sample amplifying circuit utilizes in-phase amplifier amplification to be amplified by the sample rate current that the first sampling resistor R01 provides, and supplies the current signal of amplification to error amplifier circuit.
Error amplifying circuit comprises the 3rd operational amplifier A 3, the 3rd electric capacity C3, slide rheostat P and the second reference voltage source V12; The reverse input end of the 3rd operational amplifier A 3 is connected with the output terminal of the 3rd operational amplifier A 3 through the 15 resistance R15, is connected with the 3rd electric capacity C3 between the inverting input of the 3rd operational amplifier A 3 and output terminal; The positive input of the 3rd operational amplifier A 3 is connected with the intermediate ends of slide rheostat P; One end of slide rheostat P is connected with the second reference power supply, other end ground connection.
Error amplifier circuit principle of work: the reference voltage provided by the second reference power supply V12 is by being input to the positive input of the 3rd operational amplifier A 3 after slide rheostat P dividing potential drop, the output voltage of the second operational amplifier A 2 is input to the inverting input of the 3rd operational amplifier A 3, when the forward input signal of the 3rd operational amplifier is greater than reverse input signal, namely the 3rd operational amplifier A 3 exports noble potential, otherwise then exports electronegative potential.
Emitter follower comprises the first triode T1, the 16 resistance R16 and the 17 resistance R17; The base stage of the first triode T1 is connected to the output terminal of the 3rd operational amplifier A 3 through the 16 resistance R16; The collector of the first triode T1 is connected to the positive power source terminal of the second operational amplifier A 2; The emitter of the first triode T1 is connected with one end of the 17 resistance R17 and the base stage of the second field effect transistor Q2 respectively; The other end ground connection of the 17 resistance R17.
Emitter follower principle of work: export through emitter after the output potential of the 3rd operational amplifier A 3 is come in and gone out by the base stage of the first triode, can low output impedance be realized.
Pulse modulated circuit comprises the second field effect transistor photoelectrical coupler G2, the second triode T2, the 18 resistance R18, the 19 resistance R19, the 20 resistance R20 and switch; Second field effect transistor photoelectrical coupler G2 comprises luminous second light emitting diode and the second phototransistor; The collector of the second phototransistor is connected with the positive power source terminal of the second operational amplifier A 2 and one end of the 18 resistance R18 respectively; The emitter of the second phototransistor is connected to the inverting input of the 3rd operational amplifier A 3 through the 19 resistance R19; The other end of the 18 resistance R18 is connected with the anode of the second light emitting diode; The negative electrode of the second light emitting diode is connected with the collector of the second triode T2; The base stage of the second triode T2 is connected to the positive power source terminal of the first operational amplifier A 1 through the 20 resistance R20, and is provided with a switch S 2 between the positive power source terminal of the 20 resistance R20 and the first operational amplifier A 1; The grounded emitter of the second triode T2.
Pulse modulated circuit principle of work: when short circuiting switch S2 disconnects, error amplifier circuit normally works; When short circuiting switch S2 closes, noble potential is connected to the second triode T2 by the 20 resistance R20, second triode T2 conducting, electric current after the 18 resistance R18 current limliting drives the second phototransistor conducting by the second light emitting diode, the positive power source terminal of the second operational amplifier that the noble potential of second source V22 is connected to, namely error amplifier circuit forbids work.Namely the recurrent pulse work of load is completed by short circuiting switch S2.
In the present embodiment, that the first field effect transistor Q1 and the second field effect transistor Q2 adopts is N-MOSFET.What the first triode T1 and the second triode T2 adopted is NPN type triode.
This high voltage and constant current electronic load circuit constant current operation analyze: from first sampling resistor R01 sample current signal (being denoted as Vin) by after current sample amplifying circuit, signal after recycling amplification and the constant current setting signal (being denoted as Vref) of slide rheostat P dividing potential drop compare, then by being input to load blocks after error amplifier circuit output error signal to emitter follower with control load circuit control voltages.As Vin>Vref, then the grid voltage of the second field effect transistor Q2 reduces, the source electrode of the second field effect transistor Q2 and drain impedance increase, first voltage stabilizing diode D1 both end voltage reduces, the source electrode of the first field effect transistor Q1 and drain impedance increase, whole loaded impedance is increased, namely reduces the load current of whole load blocks.Otherwise whole loaded impedance increases little, increases the load current of whole load blocks.In practice process, the number of the first load blocks parallel connection can be selected according to different power utilization environments.Adopt this kind of method, only need the withstand voltage of regulating load number of modules and adjustable whole load, to make this load circuit works in 10,000 volts even hyperbaric environment of 20,000 volts.
Claims (8)
1. a high voltage and constant current electronic load circuit, comprises control circuit and load circuit, it is characterized in that,
Described load circuit comprises the first load blocks that the second load blocks and some and described second load blocks are connected in parallel;
Described control circuit comprises: operating voltage enable circuits, current sample amplifying circuit, error amplifier circuit, pulse modulated circuit and emitter follower; Described operating voltage enable circuits is connected with described load circuit, current sample amplifying circuit and pulse modulated circuit respectively; Described current sample amplifying circuit is connected with described load circuit, error amplifier circuit, pulse modulated circuit and emitter follower respectively; Described error amplifier circuit is connected with institute's pulse modulated circuit and emitter follower respectively; Described emitter follower is connected with described load circuit.
2. high voltage and constant current electronic load circuit according to claim 1, is characterized in that, described first load blocks comprises equalizer circuit unit and load unit;
Described load unit comprises the first field effect transistor, the first resistance, the second resistance and the first voltage stabilizing diode; The drain electrode of described first field effect transistor is connected with one end of described first resistance, the grid of described first field effect transistor is connected with the negative electrode of described first voltage stabilizing diode and one end of the second resistance respectively, and the source electrode of described first field effect transistor is connected with the anode of described first voltage stabilizing diode;
Described equalizer circuit comprises the 3rd resistance and the first electric capacity; One end of described 3rd resistance is connected with the other end of the second resistance, and described first load blocks that the other end of described 3rd resistance is adjacent with described first load blocks is connected; Described first Capacitance parallel connection is in the 3rd resistance two ends.
3. high voltage and constant current electronic load circuit according to claim 2, it is characterized in that, described second load blocks comprises the second field effect transistor, the second voltage stabilizing diode, the second electric capacity, the 4th resistance, the 5th resistance, the first sampling resistor and the second sampling resistor; The drain electrode of described second field effect transistor is connected with one end of the 4th resistance, and the other end of described 4th resistance is connected to the source electrode of described first field effect transistor; The grid of described second field effect transistor is connected with the negative electrode of described second voltage stabilizing diode; The source electrode of described second field effect transistor is connected with one end of described first sampling resistor; One end of described 5th resistance is connected with one end of described 3rd resistance, and the other end of described 5th resistance is connected with one end of the second sampling resistor; One end of described second electric capacity is connected with the first electric capacity; The other end of the other end of described first sampling resistor, the anode of the second voltage stabilizing diode, the second sampling resistor and the equal ground connection of the other end of the second electric capacity.
4. high voltage and constant current electronic load circuit according to claim 3, is characterized in that, described operating voltage enable circuits comprises return difference comparer and the first field effect transistor photoelectrical coupler;
Described first field effect transistor photoelectrical coupler comprises the first light emitting diode and the first phototransistor;
Described return difference comparer comprises the first operational amplifier, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance and the tenth resistance; One end of described 6th resistance is connected with the reverse input end of the first operational amplifier, and the other end is connected between the second sampling resistor and the 5th resistance; One end of described 7th resistance is connected to the normal phase input end of the first operational amplifier, and the other end is connected with the first reference voltage source; The output terminal of described first operational amplifier is connected to the anode of the first light emitting diode through the 8th resistance that is connected in series and the 9th resistance; One end of described tenth resistance is connected to the positive input of the first operational amplifier, and the other end is connected between the 8th resistance and the 9th resistance; The positive power source terminal of described first operational amplifier is connected with the positive pole of the first power supply and the collector of the first phototransistor respectively.
5. high voltage and constant current electronic load circuit according to claim 4, it is characterized in that, described current sample amplifying circuit comprises the second operational amplifier, the first diode, the second diode, the 11 resistance, the 12 resistance, the 13 resistance and the 14 resistance; The positive input of described second operational amplifier is connected through the emitter of the 11 resistance with described first phototransistor, and the positive input of described second operational amplifier is connected between the source electrode of the first sampling resistor and the second field effect transistor through the 12 resistance; Be connected with the 13 resistance between the inverting input of described second operational amplifier and its output terminal, one end of described 14 resistance is connected with the inverting input of the second operational amplifier, the other end ground connection of described 14 resistance; The anode of described first diode is connected with the positive input of described second operational amplifier respectively with the negative electrode of the second diode; The negative electrode of described first diode is connected to the positive power source terminal of described second operational amplifier, the plus earth of described second diode.
6. high voltage and constant current electronic load circuit according to claim 5, is characterized in that, described error amplifying circuit comprises the 3rd operational amplifier, the 3rd electric capacity, slide rheostat and the second reference voltage source; The reverse input end of described 3rd operational amplifier is connected through the output terminal of the 15 resistance with described 3rd operational amplifier, is connected with the 3rd electric capacity between the inverting input of described 3rd operational amplifier and output terminal; The positive input of described 3rd operational amplifier is connected with the intermediate ends of slide rheostat; One end of described slide rheostat is connected with reference power supply, the other end ground connection of slide rheostat.
7. high voltage and constant current electronic load circuit according to claim 6, is characterized in that, described emitter follower comprises the first triode, the 16 resistance and the 17 resistance; The base stage of described first triode is connected to the output terminal of the 3rd operational amplifier through the 16 resistance; The collector of described first triode is connected to the positive power source terminal of described second operational amplifier; The emitter of described first triode is through the 17 resistance eutral grounding; The emitter of described first triode is connected with one end of the 17 resistance and the base stage of the second field effect transistor respectively.
8. high voltage and constant current electronic load circuit according to claim 7, is characterized in that, described pulse modulated circuit comprises the second field effect transistor photoelectrical coupler, the second triode, the 18 resistance, the 19 resistance, the 20 resistance and switch; Described second field effect transistor photoelectrical coupler comprises luminous second light emitting diode and the second phototransistor; The collector of described second phototransistor is connected with the positive power source terminal of described second operational amplifier and one end of the 18 resistance respectively; The emitter of described second phototransistor is connected to the inverting input of the 3rd operational amplifier through the 19 resistance; The other end of described 18 resistance is connected with the anode of described second light emitting diode; The negative electrode of described second light emitting diode is connected with the collector of described second triode; The base stage of described second triode is connected to the positive power source terminal of described first operational amplifier through described 20 resistance, and is provided with a switch between described 20 resistance and the positive power source terminal of the first operational amplifier; The grounded emitter of described second triode.
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| CN201420477653.4U CN204314348U (en) | 2014-08-23 | 2014-08-23 | A kind of high voltage and constant current electronic load circuit |
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| CN201420477653.4U CN204314348U (en) | 2014-08-23 | 2014-08-23 | A kind of high voltage and constant current electronic load circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104977442A (en) * | 2015-06-18 | 2015-10-14 | 杭州长川科技股份有限公司 | Power module circuit for high-current power device test system |
| CN105356753A (en) * | 2015-11-11 | 2016-02-24 | 中国电子科技集团公司第二十九研究所 | High voltage electronic analog load circuit |
| CN107402323A (en) * | 2017-08-31 | 2017-11-28 | 成都四威功率电子科技有限公司 | A kind of travelling-wave tubes helical current measuring device and method |
| CN108870797A (en) * | 2018-04-28 | 2018-11-23 | 西南科技大学 | A kind of more gear switch semiconductor cooler current-limiting protection circuits |
| CN115734428A (en) * | 2022-12-28 | 2023-03-03 | 威海中远海运重工科技有限公司 | Constant-power stepless dimming control system |
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2014
- 2014-08-23 CN CN201420477653.4U patent/CN204314348U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104977442A (en) * | 2015-06-18 | 2015-10-14 | 杭州长川科技股份有限公司 | Power module circuit for high-current power device test system |
| CN105356753A (en) * | 2015-11-11 | 2016-02-24 | 中国电子科技集团公司第二十九研究所 | High voltage electronic analog load circuit |
| CN107402323A (en) * | 2017-08-31 | 2017-11-28 | 成都四威功率电子科技有限公司 | A kind of travelling-wave tubes helical current measuring device and method |
| CN107402323B (en) * | 2017-08-31 | 2023-08-04 | 成都四威功率电子科技有限公司 | Device and method for measuring spiral current of traveling wave tube |
| CN108870797A (en) * | 2018-04-28 | 2018-11-23 | 西南科技大学 | A kind of more gear switch semiconductor cooler current-limiting protection circuits |
| CN108870797B (en) * | 2018-04-28 | 2020-11-03 | 西南科技大学 | Current-limiting protection circuit of multi-gear switching semiconductor refrigerator |
| CN115734428A (en) * | 2022-12-28 | 2023-03-03 | 威海中远海运重工科技有限公司 | Constant-power stepless dimming control system |
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