CN209692345U - It is a kind of for limiting the constant-current source circuit of current over pulse - Google Patents
It is a kind of for limiting the constant-current source circuit of current over pulse Download PDFInfo
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- CN209692345U CN209692345U CN201920642798.8U CN201920642798U CN209692345U CN 209692345 U CN209692345 U CN 209692345U CN 201920642798 U CN201920642798 U CN 201920642798U CN 209692345 U CN209692345 U CN 209692345U
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Abstract
The utility model discloses a kind of for limiting the constant-current source circuit of current over pulse; it is related to communication and electronic technology field; constant-current source circuit includes constant current main circuit and protection circuit; constant current main circuit is used to export constant current for load, and constant current main circuit includes an an operational amplifier U1 and transistor Q1；Protecting circuit includes the 4th resistance R4, diode D1 and voltage-stabiliser tube D2; 4th one end resistance R4 is connected with preset second reference voltage VEE; the other end is connected with the anode of voltage-stabiliser tube D2; the cathode of voltage-stabiliser tube D2 is connected with transistor Q1; the anode of diode D1 is connected with the positive input of operational amplifier U1, and the cathode of diode D1 is connected between the 4th resistance R4 and the anode of voltage-stabiliser tube D2.The constant-current source circuit provided by the utility model for being used to limit current over pulse, it is possible to prevente effectively from device contacts are bad or charge the immediate current overshoot occurred when hot plug, better performances.
Description
Technical field
The utility model relates to communicate and electronic technology field, and in particular to a kind of for limiting the constant-current source of current over pulse
Circuit.
Background technique
In general, discrete PN junction device, as diode, semiconductor laser need to test when factory's supplied materials is checked and accepted and is authenticated
Receive its photoelectric properties.In order to check and accept the photoelectric properties of discrete PN junction device, since it is with single PN junction characteristic, therefore, it is necessary to
Its electro-optical parameters is detected using constant current driving, to propose more demands to constant-current source circuit.
Shown in Figure 1, in the prior art, conventional constant-current source circuit includes power supply VCC, load, the first reference voltage
Vset, field-effect tube Q1, first resistor R1, second resistance R2,3rd resistor R3 and operational amplifier U1.In the circuit,
One reference voltage Vset is connected by 3rd resistor R3 with the positive input of operational amplifier U1, the output of operational amplifier U1
End is connected after second resistance R2 with the grid of field-effect tube Q1, drain electrode of the power supply VCC after overload with field-effect tube Q1
It is connected, the source electrode of field-effect tube Q1 is grounded after first resistor R1, and the reverse input end of operational amplifier U1 connects effect on the scene
It should be between the source electrode and first resistor R1 of pipe Q1.
Emulation testing is carried out to constant-current source circuit in the prior art, simulate above-mentioned constant-current source circuit in active hot plug or
Person because caused by poor contact when passive hot plug the both ends field-effect tube Q1 voltage waveform, as shown in Fig. 2, waveform 1 is expressed as
Hot plug powers on the voltage waveform of rear field-effect tube Q1 drain electrode, and waveform 2 is expressed as hot plug and powers on rear field-effect tube Q1 source electrode
Voltage waveform, the voltage in as Fig. 1 on first resistor R1, the resistance value of the voltage shown by waveform 2 and first resistor R1, knot
Ohm's law is closed, the electric current by field-effect tube Q1 can be obtained.
From the waveform 2 in simulation result as it can be seen that when the constant-current source circuit is after hot plug powers on, field-effect tube Q1 can be by
Overshoot rush of current may result in LED load performance damage even thoroughly damage or the damage of field-effect tube Q1 performance,
So that the constant-current source circuit service life is shorter, higher cost.
Utility model content
In view of the deficiencies in the prior art, the purpose of this utility model is to provide one kind for limiting current over pulse
Constant-current source circuit, it is possible to prevente effectively from device contacts it is bad or electrification hot plug when occur immediate current overshoot, reduce
Damage to measured device, better performances.
To achieve the above objectives, the technical scheme adopted by the utility model is that:
It is a kind of for limiting the constant-current source circuit of current over pulse, including power supply VCC, the load being connected with the power supply VCC,
Further include:
Constant current main circuit, is used to export constant current for the load, and the constant current main circuit includes an operation amplifier
A device U1 and transistor Q1；
Protect circuit comprising the second reference voltage VEE, the 4th resistance R4, diode D1 and voltage-stabiliser tube D2, the described 4th
The one end resistance R4 is connected with preset second reference voltage VEE, and the other end is connected with the anode of voltage-stabiliser tube D2, the voltage-stabiliser tube D2
Cathode be connected with the transistor Q1, the positive input phase of the anode of the diode D1 and the operational amplifier U1
Even, the cathode of the diode D1 is connected between the 4th resistance R4 and the anode of voltage-stabiliser tube D2.
Based on the above technical solution, the constant current main circuit further includes the first reference voltage Vset, first resistor
R1, second resistance R2,3rd resistor R3, the one end the 3rd resistor R3 is connected with preset first reference voltage Vset, another
End is connected with the positive input of the operational amplifier U1, and the output end of the operational amplifier U1 passes through the second resistance
It is connected after R2 with the first end of the transistor Q1, second end phase of the power supply VCC after overload with the transistor Q1
Even, the third end of the transistor Q1 is grounded after the first resistor R1, the reverse input end of the operational amplifier U1
It is connected between the third end and first resistor R1 of the transistor Q1.
Based on the above technical solution, the constant current main circuit further includes capacitor C1, the one end the capacitor C1 and institute
The first end for stating transistor Q1 is connected, and the other end is connected between the third end and first resistor R1 of the transistor Q1.
Based on the above technical solution, the second reference voltage VEE is greater than the first reference voltage Vset.
Based on the above technical solution, the voltage value of the power supply VCC is greater than the second reference voltage VEE.
Based on the above technical solution, one is additionally provided between the power supply VCC and load for control circuit on-off
Switch.
Based on the above technical solution, the transistor Q1 is field-effect tube.
Based on the above technical solution, the output end of the operational amplifier U1 after the second resistance R2 with
The grid of the transistor Q1 is connected, and the power supply VCC is connected after overload with the drain electrode of the transistor Q1, the crystal
The source electrode of pipe Q1 is grounded after the first resistor R1, and the reverse input end of the operational amplifier U1 is connected to the crystal
Between the source electrode and first resistor R1 of pipe Q1.
Based on the above technical solution, the transistor Q1 is NMOS tube.
Based on the above technical solution, the voltage-stabiliser tube D2 is Transient Suppression Diode.
The utility model additionally provides a kind of for limiting the constant-current source circuit of current over pulse, comprising:
Constant current main circuit, be used for for load export constant current, the constant current main circuit include operational amplifier U1 and
Transistor Q1；
Protect circuit comprising the 4th resistance R4, diode D1 and voltage-stabiliser tube D2, described 4th one end resistance R4 and default
The second reference voltage VEE be connected, the other end is connected with the anode of voltage-stabiliser tube D2, the cathode of the voltage-stabiliser tube D2 and the crystal
Pipe Q1 is connected, and the anode of the diode D1 is connected with the positive input of the operational amplifier U1, the diode D1's
Cathode is connected between the 4th resistance R4 and the anode of voltage-stabiliser tube D2.
Compared with the prior art, the advantages of the utility model are: the perseverance for being used to limit current over pulse of the utility model
Current source circuit is by devising protection circuit, so as to what is occurred when effectively avoiding device contacts bad or electrification hot plug
Immediate current overshoot, damage of the reduction to measured device, better performances, and the circuit structure is simple, cost is relatively low, is applicable in model
It encloses wider.
Detailed description of the invention
Fig. 1 is the schematic diagram of constant-current source circuit in the prior art；
Fig. 2 is the simulation results schematic diagram of constant-current source circuit in the prior art；
Fig. 3 is a kind of for limiting the schematic diagram of the constant-current source circuit of current over pulse in the utility model embodiment；
Fig. 4 is a kind of for limiting the artificial circuit figure of the constant-current source circuit of current over pulse in the utility model embodiment；
Fig. 5 is a kind of for limiting the simulation results of the constant-current source circuit of current over pulse in the utility model embodiment
Schematic diagram.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Ground description, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is right below
The description only actually of at least one exemplary embodiment be it is illustrative, never as to the application and its application or use
Any restrictions.Based on the embodiment in the application, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, shall fall in the protection scope of this application.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.It should be pointed out that all attached drawings are illustrative expression.For the ordinary skill of this field
For personnel, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
The utility model is described in further detail with reference to the accompanying drawings and embodiments.
Shown in Figure 3, the utility model embodiment provides a kind of for limiting the constant-current source circuit of current over pulse, packet
It includes:
Power supply VCC, the load being connected with the power supply VCC；In the present embodiment, it loads as LED, in practical applications,
It is also possible to other kinds of load；
Constant current main circuit, is used to export constant current for the load, and the constant current main circuit includes an operation amplifier
A device U1 and transistor Q1；
Protect circuit comprising the second reference voltage VEE, the 4th resistance R4, diode D1 and voltage-stabiliser tube D2, the described 4th
The one end resistance R4 is connected with preset second reference voltage VEE, and the other end is connected with the anode of voltage-stabiliser tube D2, the voltage-stabiliser tube D2
Cathode be connected with the transistor Q1, the positive input phase of the anode of the diode D1 and the operational amplifier U1
Even, the cathode of the diode D1 is connected between the 4th resistance R4 and the anode of voltage-stabiliser tube D2.
The working principle of the constant-current source circuit for limiting current over pulse of the utility model embodiment are as follows: when load disconnects
When, the drain voltage of the transistor Q1 is close to 0V, at this point, diode D1 forward conduction, so that the operational amplifier
The voltage of the positive input of U1 reduces, so that passing through transistor Q1 lightly conducting, it is ensured that does not have wink when load access below
Between uncontrolled high current overshoot, play the role of protecting device；When loading access, the voltage of the second reference voltage VEE is small
In the drain voltage of the transistor Q1, at this point, voltage-stabiliser tube D2 reverse-conducting, diode D1 cut-off, protect circuit and constant current master
Circuit disconnects, and protection circuit will not influence the normal constant current output of constant current main circuit.
The constant-current source circuit for limiting current over pulse of the utility model embodiment is by devising protection circuit, when negative
It carries after disconnecting, protection circuit enables the normal linear working condition to maintain operational amplifier U1 and transistor Q1 automatically, realizes
Temporary over-current is eliminated, the immediate current so as to occur when effectively avoiding device contacts bad or electrification hot plug overshoots,
Better performances, and the circuit structure is simple, cost is relatively low, and the scope of application is wider.
More specifically, the constant current main circuit further includes the first reference voltage Vset, first resistor R1, second resistance
R2,3rd resistor R3, the one end the 3rd resistor R3 are connected with preset first reference voltage Vset, the other end and the operation
The positive input of amplifier U1 is connected, the output end of the operational amplifier U1 after the second resistance R2 with the crystalline substance
The first end of body pipe Q1 is connected, and the power supply VCC is connected after overload with the second end of the transistor Q1, the transistor
The third end of Q1 is grounded after the first resistor R1, and the reverse input end of the operational amplifier U1 is connected to the crystal
Between the third end and first resistor R1 of pipe Q1.
In utility model embodiment, the constant current main circuit further includes capacitor C1, the one end the capacitor C1 and the crystalline substance
The first end of body pipe Q1 is connected, and the other end is connected between the third end and first resistor R1 of the transistor Q1, can be to electricity
It plays a protective role during road.
Preferably, the second reference voltage VEE is greater than the first reference voltage Vset.The voltage of the power supply VCC
Value is greater than the second reference voltage VEE.In the utility model embodiment, the first reference voltage Vset is interpreted as controlling defeated
The reference voltage of size of current out, the second reference voltage VEE are interpreted as the reference voltage of starting protection.
Preferably, the transistor Q1 is field-effect tube.It is further preferable that the transistor Q1 is NMOS tube.Due to field
Effect pipe is using relatively broad, and cost is relatively low, better performances, can, it is preferable to use field-effect tube in the utility model embodiment
So that entire circuit structure is simple, cost is reduced, the scope of application is wider, with good application prospect and promotional value.
Correspondingly, the output end of the operational amplifier U1 is after the second resistance R2 with the transistor Q1's
Grid is connected, and the power supply VCC is connected after overload with the drain electrode of the transistor Q1, and the source electrode of the transistor Q1 passes through
It is grounded after the first resistor R1, the reverse input end of the operational amplifier U1 is connected to the source electrode and of the transistor Q1
Between one resistance R1.The cathode of the voltage-stabiliser tube D2 is connected with the drain electrode of the transistor Q1.
In the utility model embodiment, the voltage-stabiliser tube D2 is Transient Suppression Diode.Transient Suppression Diode D2 is again
Referred to as TVS diode, when the two poles of the earth of TVS diode are by reversed transient state high energy impact events, it can be with 10 minus 12 power second
The high impedance of its two interpolar is become Low ESR, absorbs up to thousands of watts of surge power, make the electricity of two interpolars by the speed of magnitude
Pressure clamp is in a predetermined value, the precision components being effectively protected in electronic circuit, from the damage of surge pulse, thus right
Entire circuit plays a very good protection.
Shown in Figure 4, the utility model embodiment additionally provides a kind of for limiting the constant-current source circuit of current over pulse
Artificial circuit figure one is additionally provided between the power supply VCC and load for control circuit on-off in the artificial circuit figure
Switch S uses the hot plug of switch S fictitious load.
In the artificial circuit figure, the constant-current source circuit for limiting current over pulse includes power supply VCC and the power supply
VCC connected load, constant current main circuit and protection circuit.
Constant current main circuit is used to export constant current for the load, and the constant current main circuit includes an operational amplifier U1
It is NMOS tube with a transistor Q1, transistor Q1.
Protecting circuit includes the second reference voltage VEE, the 4th resistance R4, diode D1 and voltage-stabiliser tube D2, the 4th electricity
Resistance one end R4 is connected with preset second reference voltage VEE, and the other end is connected with the anode of voltage-stabiliser tube D2, the voltage-stabiliser tube D2's
Cathode is connected with the transistor Q1, and the anode of the diode D1 is connected with the positive input of the operational amplifier U1,
The cathode of the diode D1 is connected between the 4th resistance R4 and the anode of voltage-stabiliser tube D2.
Further, the constant current main circuit further includes the first reference voltage Vset, first resistor R1, second resistance
R2,3rd resistor R3, the one end the 3rd resistor R3 are connected with preset first reference voltage Vset, the other end and the operation
The positive input of amplifier U1 is connected, the output end of the operational amplifier U1 after the second resistance R2 with the crystalline substance
The grid of body pipe Q1 is connected, and the power supply VCC is connected after overload with the drain electrode of the transistor Q1, the transistor Q1's
Source electrode is grounded after the first resistor R1, and the reverse input end of the operational amplifier U1 is connected to the transistor Q1's
Between source electrode and first resistor R1.The cathode of the voltage-stabiliser tube D2 is connected with the drain electrode of the transistor Q1.
It further include an oscillograph meanwhile in the artificial circuit figure of the utility model, by one of channel of oscillograph
It is connected to the drain electrode of transistor Q1, for characterizing the drain voltage that device after switch S is closed powers on rear field-effect tube, by oscillograph
Another channel be connected to the source electrode of transistor Q1, the voltage on available first resistor R1, according to Ohm's law, Neng Gouyong
To characterize the electric current by the field-effect tube.
In the utility model embodiment, it is preferable that power supply VCC be 12V, the second reference voltage VEE be 1.75V, first
Reference voltage Vset is 1.125V, and the resistance value of first resistor R1 is 10 Ω, and the second resistance value R2 is 100 Ω, 3rd resistor R3 and the
The resistance value of four resistance R4 is 10K Ω.
Simulation test is carried out to the artificial circuit of Fig. 4, obtains waveform 1 with the voltage that oscillograph takes field-effect tube Q1 to drain,
The voltage of field-effect tube Q1 source electrode is taken to obtain waveform 2, obtained the simulation results schematic diagram is as shown in Figure 5.From emulation testing
As a result waveform 2 effectively prevents immediate current overshoot as it can be seen that the temporary over-current on field-effect tube Q1 completely eliminates, performance compared with
It is good.
It is additionally provided in the utility model embodiment a kind of for limiting the constant-current source circuit of current over pulse, comprising:
Constant current main circuit, be used for for load export constant current, the constant current main circuit include operational amplifier U1 and
Transistor Q1；
Protect circuit comprising the 4th resistance R4, diode D1 and voltage-stabiliser tube D2, described 4th one end resistance R4 and default
The second reference voltage VEE be connected, the other end is connected with the anode of voltage-stabiliser tube D2, the cathode of the voltage-stabiliser tube D2 and the crystal
Pipe Q1 is connected, and the anode of the diode D1 is connected with the positive input of the operational amplifier U1, the diode D1's
Cathode is connected between the 4th resistance R4 and the anode of voltage-stabiliser tube D2.
A kind of constant current main circuit is only gived in the present invention, however in actually using, constant-current source circuit type is more
Kind multiplicity, the equal function in combination with the protection circuit realization limitation current over pulse in the present embodiment, it will be understood that this combination
Scheme is also within the protection scope of the utility model.
The utility model is not limited to above embodiment, for those skilled in the art, not
Under the premise of being detached from the utility model principle, several improvements and modifications can also be made, these improvements and modifications are also considered as this reality
Within novel protection scope.The content being not described in detail in this specification belongs to well known to professional and technical personnel in the field
The prior art.
Claims (10)
1. a kind of for limiting the constant-current source circuit of current over pulse, including power supply VCC, the load being connected with the power supply VCC,
It is characterized in that, further includes:
Constant current main circuit, be used for for the load export constant current, the constant current main circuit include operational amplifier U1 and
Transistor Q1；
Protect circuit comprising the 4th resistance R4, diode D1 and voltage-stabiliser tube D2, described 4th one end resistance R4 and preset the
Two reference voltage VEE are connected, and the other end is connected with the anode of voltage-stabiliser tube D2, the cathode of the voltage-stabiliser tube D2 and the transistor Q1
It is connected, the anode of the diode D1 is connected with the positive input of the operational amplifier U1, the cathode of the diode D1
It is connected between the 4th resistance R4 and the anode of voltage-stabiliser tube D2.
2. as described in claim 1 for limiting the constant-current source circuit of current over pulse, it is characterised in that: the constant current main circuit
It further include first resistor R1, second resistance R2,3rd resistor R3；
The one end the 3rd resistor R3 is connected with preset first reference voltage Vset, and the other end is with the operational amplifier U1's
Positive input is connected, the output end of the operational amplifier U1 after the second resistance R2 with the transistor Q1 the
One end is connected, and the power supply VCC is connected after overload with the second end of the transistor Q1, the third end of the transistor Q1
It is grounded after the first resistor R1, the reverse input end of the operational amplifier U1 is connected to the third of the transistor Q1
Between end and first resistor R1.
3. as claimed in claim 2 for limiting the constant-current source circuit of current over pulse, it is characterised in that: the constant current main circuit
It further include capacitor C1, the one end the capacitor C1 is connected with the first end of the transistor Q1, and the other end is connected to the transistor
Between the third end and first resistor R1 of Q1.
4. as claimed in claim 2 for limiting the constant-current source circuit of current over pulse, it is characterised in that: described second with reference to electricity
VEE is pressed to be greater than the first reference voltage Vset.
5. as claimed in claim 2 for limiting the constant-current source circuit of current over pulse, it is characterised in that: the power supply VCC's
Voltage value is greater than the second reference voltage VEE.
6. as claimed in claim 2 for limiting the constant-current source circuit of current over pulse, it is characterised in that: the power supply VCC and
A switch for control circuit on-off is additionally provided between load.
7. as claimed in claim 2 for limiting the constant-current source circuit of current over pulse, it is characterised in that: the transistor Q1 is
Field-effect tube.
8. as claimed in claim 7 for limiting the constant-current source circuit of current over pulse, it is characterised in that: the operational amplifier
The output end of U1 is connected after the second resistance R2 with the grid of the transistor Q1, and the power supply VCC is after overload
It is connected with the drain electrode of the transistor Q1, the source electrode of the transistor Q1 is grounded after the first resistor R1, the operation
The reverse input end of amplifier U1 is connected between the source electrode and first resistor R1 of the transistor Q1.
9. as described in claim 1 for limiting the constant-current source circuit of current over pulse, it is characterised in that: the voltage-stabiliser tube D2 is
Transient Suppression Diode.
10. a kind of for limiting the constant-current source circuit of current over pulse characterized by comprising
Constant current main circuit is used to export constant current for load, and the constant current main circuit includes operational amplifier U1 and crystal
Pipe Q1；
Protect circuit comprising the 4th resistance R4, diode D1 and voltage-stabiliser tube D2, described 4th one end resistance R4 and preset the
Two reference voltage VEE are connected, and the other end is connected with the anode of voltage-stabiliser tube D2, the cathode of the voltage-stabiliser tube D2 and the transistor Q1
It is connected, the anode of the diode D1 is connected with the positive input of the operational amplifier U1, the cathode of the diode D1
It is connected between the 4th resistance R4 and the anode of voltage-stabiliser tube D2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920642798.8U CN209692345U (en) | 2019-05-07 | 2019-05-07 | It is a kind of for limiting the constant-current source circuit of current over pulse |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920642798.8U CN209692345U (en) | 2019-05-07 | 2019-05-07 | It is a kind of for limiting the constant-current source circuit of current over pulse |
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| CN209692345U true CN209692345U (en) | 2019-11-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022095774A1 (en) * | 2020-11-04 | 2022-05-12 | 苏州欧普照明有限公司 | Control circuit and lighting device |
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2019
- 2019-05-07 CN CN201920642798.8U patent/CN209692345U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022095774A1 (en) * | 2020-11-04 | 2022-05-12 | 苏州欧普照明有限公司 | Control circuit and lighting device |
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Effective date of registration: 20200826 Address after: 430000 part of the third floor of cable building, Guandong science and Technology Park, Donghu New Technology Development Zone, Wuhan, Hubei Province Patentee after: Wuhan Changjiang Computing Technology Co., Ltd Address before: 430000 East Lake high tech Development Zone, Hubei Province, No. 6, No., high and new technology development zone, No. four Patentee before: FIBERHOME TELECOMMUNICATION TECHNOLOGIES Co.,Ltd. |
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