CN207304494U - One kind protection circuit - Google Patents
One kind protection circuit Download PDFInfo
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- CN207304494U CN207304494U CN201721406898.8U CN201721406898U CN207304494U CN 207304494 U CN207304494 U CN 207304494U CN 201721406898 U CN201721406898 U CN 201721406898U CN 207304494 U CN207304494 U CN 207304494U
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Abstract
The utility model discloses one kind to protect circuit, and for protecting gallium nitride power device, the protection circuit includes：Switching sequence circuit, the switching sequence circuit are used to protect the gallium nitride power device；Temperature-compensation circuit, the temperature-compensation circuit are used to realize temperature-compensating for the protection circuit；Constant pressure and flow circuit, the constant pressure and flow circuit are used to make the protection circuit constant pressure and flow.The protection circuit realizes constant current constant voltage, and applicability is extensive, and circuit is simple, and cost is low.
Description
Technical field
Gallium nitride power tube protection technique field is the utility model is related to, more specifically, more particularly to a kind of protection electricity
Road.
Background technology
With the continuous development of scientific technology, the research of GaN material and application have been current technical field of semiconductors research
Hot spot, be develop microelectronic component, the novel semiconductor material of opto-electronic device.
The semi-conducting material such as GaN material and SiC, diamond is known as after first generation Ge, Si semi-conducting material, the second generation
Third generation novel semiconductor material after GaAs, InP compound semiconductor materials.It is with wide direct band gap, stronger
Property and the stronger Radiation hardness such as atom key, higher thermal conductivity, chemical stability be good, are widely used in photoelectron, height
The fields such as warm high power device and high-frequency microwave device.
Microwave power amplifier device based on gallium nitride, the requirement to power supply timing, stability and temperature are all very high.
But current gallium nitride power supply bias protection circuit, it can not realize constant current constant voltage, stabilizing it property is deteriorated；And
And existing temperature-compensation circuit is complicated.
Utility model content
To solve the above problems, the utility model provides a kind of protection circuit, which realizes constant current constant voltage
Function.
To achieve the above object, the utility model provides following technical solution：
One kind protection circuit, for protecting gallium nitride power device, the protection circuit includes：
Switching sequence circuit, the switching sequence circuit are used to protect the gallium nitride power device；
Temperature-compensation circuit, the temperature-compensation circuit are used to realize temperature-compensating for the protection circuit；
Constant pressure and flow circuit, the constant pressure and flow circuit are used to make the protection circuit constant pressure and flow.
Preferably, in above-mentioned protection circuit, the switching sequence circuit is specifically used for：
When the voltage for detecting default node meets preset condition, the switching sequence circuit turn-on.
Preferably, in above-mentioned protection circuit, the switching sequence circuit includes：Field-effect tube, first resistor, the second electricity
Resistance and the first capacitance；
Wherein, the grid of the field-effect tube is connected with one end of the first resistor；The source electrode of the field-effect tube with
Feeder ear connects；The drain electrode of the field-effect tube is connected with the constant pressure and flow circuit；
One end of the first resistor is connected with the feeder ear；The other end of the first resistor and the second resistance
One end connection；The other end of the second resistance and negative press bond；One end of first capacitance and the second resistance
One end connection；The other end grounding connection of first capacitance；
Wherein, the connecting node between the second resistance and the first resistor is the default node, when described pre-
If the voltage of node meets preset condition, the field-effect tube conducting.
Preferably, in above-mentioned protection circuit, the switching sequence circuit further includes：3rd resistor；
Wherein, one end of the first resistor is connected with one end of the 3rd resistor, the other end of the 3rd resistor
It is connected with feeder ear.
Preferably, in above-mentioned protection circuit, the switching sequence circuit further includes：Second capacitance；
Wherein, one end of second capacitance is connected with the source electrode of the field-effect tube, the other end of second capacitance
It is connected with the grid of the field-effect tube.
Preferably, in above-mentioned protection circuit, the temperature-compensation circuit includes：First triode and the two or three pole
Pipe；
Wherein, the base stage of first triode base stage with second triode and first triode respectively
Collector connection；The emitter of first triode is connected with the drain electrode of the field-effect tube；First triode
Grounded collector；The emitter of second triode is connected with the drain electrode of the field-effect tube, and second triode
Emitter connects first voltage output terminal；The collector of second triode is connected with one end of first capacitance, and institute
State the collector connection second voltage output terminal of the second triode.
Preferably, in above-mentioned protection circuit, the constant pressure and flow circuit includes：First triode, the second triode,
Four resistance, the 5th resistance and the 6th resistance；
Wherein, the base stage of first triode base stage with second triode and first triode respectively
Collector connection；The emitter of first triode is connected with one end of the 4th resistance, the 4th resistance it is another
One end is connected with the drain electrode of the field-effect tube；The collector of first triode is connected with one end of the 5th resistance,
The other end ground connection of 5th resistance；The emitter of second triode is connected with one end of the 6th resistance, described
The other end of 6th resistance is connected with the drain electrode of the field-effect tube, and the emitter connection first voltage of second triode
Output terminal；The collector of second triode is connected with one end of first capacitance, and the current collection of second triode
Pole connects second voltage output terminal.
Preferably, in above-mentioned protection circuit, the protection circuit further includes：7th resistance；
Wherein, one end of the 7th resistance is connected with the collector of second triode, the 7th resistance it is another
One end is connected with one end of first capacitance, and the other end connection second voltage output terminal of the 7th resistance.
Preferably, in above-mentioned protection circuit, the protection circuit further includes：8th resistance；
Wherein, one end of the 8th resistance is connected with the other end of the 7th resistance, the 8th resistance it is another
End is connected with one end of first capacitance, and one end connection second voltage output terminal of the 8th resistance.
By foregoing description, a kind of protection circuit provided by the utility model includes：Switching sequence circuit, it is described to open
Sequence circuit is closed to be used to protect the gallium nitride power device；Temperature-compensation circuit, it is described that the temperature-compensation circuit, which is used for,
Protection circuit realizes temperature-compensating；Constant pressure and flow circuit, the constant pressure and flow circuit are used to make the protection circuit constant pressure and flow.
The protection circuit realizes constant current constant voltage function.
Brief description of the drawings
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, drawings in the following description are only
It is the embodiment of the utility model, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to the attached drawing of offer.
Fig. 1 is a kind of structure diagram for protection circuit that the utility model embodiment provides.
Embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are without making creative work
All other embodiments obtained, shall fall within the protection scope of the present invention.
To enable the above-mentioned purpose of the utility model, feature and advantage more obvious understandable, below in conjunction with the accompanying drawings and have
Body embodiment is described in further detail the utility model.
With reference to figure 1, Fig. 1 is a kind of structure diagram for protection circuit that the utility model embodiment provides.
The protection circuit includes：
Switching sequence circuit 11, the switching sequence circuit 11 are used to protect the gallium nitride power device；
Temperature-compensation circuit 12, the temperature-compensation circuit 12 are used to realize temperature-compensating for the protection circuit；
Constant pressure and flow circuit 13, the constant pressure and flow circuit 13 are used to make the protection circuit constant pressure and flow.
The protection circuit realizes constant current constant voltage, improves the stability of the work of its gallium nitride power tube.
Specifically, the switching sequence circuit 11 is specifically used for：
When the voltage for detecting default node meets preset condition, the switching sequence circuit 11 turns on.
That is, after power supply is started, gallium nitride power tube will not receive voltage at the first time, only when default
When the voltage of node meets preset condition, switching sequence circuit 11 can just turn on, and gallium nitride power tube is started to work.That is the switch
Sequence circuit 11 ensures that gallium nitride power tube just receives operating voltage start-up operation after certain buffer time, prevents from nitrogenizing
Gallium power tube damages device in power supply when receiving larger voltage.
Specifically, as shown in Figure 1, the switching sequence circuit 11 includes：Field-effect tube Q1, first resistor R1, the second electricity
Hinder R2 and the first capacitance C1.
Wherein, the grid of the field-effect tube Q1 is connected with one end of the first resistor R1；The field-effect tube Q1's
Source electrode is connected with feeder ear V+；The drain electrode of the field-effect tube Q1 is connected with the constant pressure and flow circuit 13.
One end of the first resistor R1 is connected with the feeder ear V+；The other end of the first resistor R1 and described the
One end connection of two resistance R2；The other end of the second resistance R2 is connected with negative pressure end V-；One end of the first capacitance C1
It is connected with one end of the second resistance R2；The other end grounding connection of the first capacitance C1.
Wherein, the connecting node A between the second resistance R2 and the first resistor R1 is the default node, works as institute
When stating the voltage of default node and meeting preset condition, the field-effect tube Q1 conductings.
That is, after voltage is applied with feeder ear V+, negative pressure end V- persistently exports negative pressure, first capacitance
C1 charges, when during charging, the electricity of the connecting node A between the first resistor R1 and the second resistance R2
When pressure meets the conducting voltage of the field-effect tube Q1, the field-effect tube Q1 conductings.
Also, before field-effect tube Q1 conductings, negative pressure end V- persistently exports negative pressure, i.e. second voltage output terminal
The voltage of VGG is the voltage of connecting node A, in the charging process of the first capacitance C1, makes its second voltage output terminal VGG
Voltage reach the shut-off voltage of gallium nitride power tube.
It should be noted that in the utility model embodiment, the field-effect tube Q1 includes but is not limited to P-channel increasing
The field-effect tube of strong type.
Further, the switching sequence circuit 11 further includes：3rd resistor R3.
Wherein, one end of the first resistor R1 is connected with one end of the 3rd resistor R3, the 3rd resistor R3's
The other end is connected with feeder ear V+.
Specifically, the 3rd resistor R3's act as pull-up resistor, the grid for ensureing the field-effect tube Q1 is positive pressure.
Further, the switching sequence circuit 11 further includes：Second capacitance C2.
Wherein, one end of the second capacitance C2 is connected with the source electrode of the field-effect tube Q1, the second capacitance C2's
The other end is connected with the grid of the field-effect tube Q1.
Wherein, the second capacitance C2 is used to filter away the due to voltage spikes when the field-effect tube Q1 is turned on.
In the utility model embodiment, as shown in Figure 1, the temperature-compensation circuit 12 includes：First triode Q2 with
And the second triode Q3.
Wherein, the base stage of the first triode Q2 base stage and the described 1st with the second triode Q3 respectively
The collector connection of pole pipe Q2；The emitter of the first triode Q2 is connected with the drain electrode of the field-effect tube Q1；Described
The grounded collector of one triode Q2；The emitter of the second triode Q3 is connected with the drain electrode of the field-effect tube Q1, and
The emitter connection first voltage output terminal VDD of the second triode Q3；The collector of second triode 13 with it is described
One end connection of first capacitance C1, and the collector connection second voltage output terminal VGG of the second triode Q3.
Specifically, since the first triode Q2 and the second triode Q3 use back-to-back connection, and then it is described
First triode Q2 is identical with the electric current of the second triode Q3.Such as, then when the temperature increases, the second triode Q3's
Electric current will increase, but due to there is the limitation of the first triode Q2, prevent the increase of the second triode Q3 electric currents, Jin Ershi
The temperature-compensating of the protection circuit is showed.
In the utility model embodiment, as shown in Figure 1, the constant pressure and flow circuit 13 includes：First triode Q2,
Two triode Q3, the 4th resistance R4, the 5th resistance R5 and the 6th resistance R6.
Wherein, the base stage of the first triode Q2 base stage and the described 1st with the second triode Q3 respectively
The collector connection of pole pipe Q2；The emitter of the first triode Q2 is connected with one end of the 4th resistance R4, and described
The other end of four resistance R4 is connected with the drain electrode of the field-effect tube Q1；The collector and the described 5th of the first triode Q2
One end connection of resistance R5, the other end ground connection of the 5th resistance R5；The emitter of the second triode Q3 and described the
One end connection of six resistance R6, the other end of the 6th resistance R6 is connected with the drain electrode of the field-effect tube Q1, and described the
The emitter connection first voltage output terminal VDD of two triode Q3；The collector of the second triode Q3 and the described first electricity
Hold one end connection of C1, and the collector connection second voltage output terminal VGG of the second triode Q3.
Specifically, the first triode Q2 is connected with the base stage of the second triode Q3, the 4th resistance R4 with
The 5th resistance R5 forms a bleeder circuit, after the first triode Q2 is turned on the three triodes Q3, due to
The partial pressure of the 4th resistance R4 and the 5th resistance R5, ensure that the first triode Q2 and the second triode Q3 base stages
Voltage constant, and then the voltage constant of the emitter of the second triode Q3, then the first voltage output terminal VDD's
Voltage constant.And the resistance value by setting the 6th resistance R6 can realize the constant of a variety of electric currents, that is, realize constant pressure
Constant current.
It should be noted that the constant pressure and flow circuit and the temperature-compensation circuit share the first triode Q2 with
The second triode Q3.
Further, the protection circuit further includes：7th resistance R7, the 8th resistance R8.
Wherein, one end of the 7th resistance R7 is connected with the collector of the second triode Q3, the 7th resistance
The other end of R7 is connected with one end of the first capacitance C1, and the other end connection second voltage output of the 7th resistance R7
Hold VGG.
One end of the 8th resistance R8 is connected with the other end of the 7th resistance R7, and the 8th resistance R8's is another
End is connected with one end of the first capacitance C1, and one end connection second voltage output terminal VGG of the 8th resistance R8.
Specifically, the protection circuit, after feeder ear V+ application voltages, negative pressure end V- persistently exports negative pressure, described first
Capacitance C1 charges, in the case where the first capacitance C1 capacitances determine, the charging interval by the second resistance R2 resistance
Value is determined, during charging, and in the case that the field-effect tube Q1 is not turned on, the second voltage output terminal
The voltage of VGG continues to up to shut-off voltage；When the voltage of the connecting node A reaches the conducting voltage of the field-effect tube Q1
When, field-effect tube Q1 conducting, and then the first triode Q2 and the second triode Q3 conductings, passes through described the
Seven resistance R7 export positive pressure, also, negative pressure end V- exports negative pressure by the 8th resistance R8, in the 7th resistance R7 and institute
In the connecting node for stating the 8th resistance R8, by the neutralization of positive pressure and negative pressure, realize the second voltage output terminal VGG different
Output.
That is, the resistance value by varying resistance in circuit, you can realize the demand of different gallium nitride power tubes.Phase
Compare manual adjustment, which improves efficiency, and applicability is extensive, and circuit is simple, and cost is low.
When feeder ear V+ voltages break when, the voltage instantaneous of the first voltage output terminal VDD to zero, but due to exist
The first capacitance C1, then the voltage of the second voltage output terminal VGG is held off, until the first capacitance C1
Electric discharge terminates, and is further effectively protected power device and avoids being damaged.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or new using this practicality
Type.A variety of modifications to these embodiments will be apparent for those skilled in the art, determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The most wide scope consistent with features of novelty.
Claims (9)
1. one kind protection circuit, for protecting gallium nitride power device, it is characterised in that the protection circuit includes：
Switching sequence circuit, the switching sequence circuit are used to protect the gallium nitride power device；
Temperature-compensation circuit, the temperature-compensation circuit are used to realize temperature-compensating for the protection circuit；
Constant pressure and flow circuit, the constant pressure and flow circuit are used to make the protection circuit constant pressure and flow.
2. protection circuit according to claim 1, it is characterised in that the switching sequence circuit is specifically used for：
When the voltage for detecting default node meets preset condition, the switching sequence circuit turn-on.
3. protection circuit according to claim 2, it is characterised in that the switching sequence circuit includes：Field-effect tube,
One resistance, second resistance and the first capacitance；
Wherein, the grid of the field-effect tube is connected with one end of the first resistor；The source electrode of the field-effect tube and power supply
End connection；The drain electrode of the field-effect tube is connected with the constant pressure and flow circuit；
One end of the first resistor is connected with the feeder ear；The other end of the first resistor and the one of the second resistance
End connection；The other end of the second resistance and negative press bond；One end of first capacitance and the one of the second resistance
End connection；The other end grounding connection of first capacitance；
Wherein, the connecting node between the second resistance and the first resistor is the default node, when the default section
When the voltage of point meets preset condition, the field-effect tube conducting.
4. protection circuit according to claim 3, it is characterised in that the switching sequence circuit further includes：3rd resistor；
Wherein, one end of the first resistor is connected with one end of the 3rd resistor, the other end of the 3rd resistor and confession
Electric end connection.
5. protection circuit according to claim 3, it is characterised in that the switching sequence circuit further includes：Second capacitance；
Wherein, one end of second capacitance is connected with the source electrode of the field-effect tube, the other end of second capacitance and institute
State the grid connection of field-effect tube.
6. protection circuit according to claim 3, it is characterised in that the temperature-compensation circuit includes：First triode
And second triode；
Wherein, the base stage of first triode respectively with the base stage of second triode and the collection of first triode
Electrode connects；The emitter of first triode is connected with the drain electrode of the field-effect tube；The current collection of first triode
Pole is grounded；The emitter of second triode is connected with the drain electrode of the field-effect tube, and the transmitting of second triode
Pole connects first voltage output terminal；The collector of second triode is connected with one end of first capacitance, and described
The collector connection second voltage output terminal of two triodes.
7. protection circuit according to claim 3, it is characterised in that the constant pressure and flow circuit includes：First triode,
Second triode, the 4th resistance, the 5th resistance and the 6th resistance；
Wherein, the base stage of first triode respectively with the base stage of second triode and the collection of first triode
Electrode connects；The emitter of first triode is connected with one end of the 4th resistance, the other end of the 4th resistance
Drain electrode with the field-effect tube is connected；The collector of first triode is connected with one end of the 5th resistance, described
The other end ground connection of 5th resistance；The emitter of second triode is connected with one end of the 6th resistance, and the described 6th
The other end of resistance is connected with the drain electrode of the field-effect tube, and the emitter connection first voltage output of second triode
End；The collector of second triode is connected with one end of first capacitance, and the collector of second triode connects
Connect second voltage output terminal.
8. protection circuit according to claim 7, it is characterised in that the protection circuit further includes：7th resistance；
Wherein, one end of the 7th resistance is connected with the collector of second triode, the other end of the 7th resistance
It is connected with one end of first capacitance, and the other end connection second voltage output terminal of the 7th resistance.
9. protection circuit according to claim 8, it is characterised in that the protection circuit further includes：8th resistance；
Wherein, one end of the 8th resistance is connected with the other end of the 7th resistance, the other end of the 8th resistance with
One end connection of first capacitance, and one end connection second voltage output terminal of the 8th resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721406898.8U CN207304494U (en) | 2017-10-26 | 2017-10-26 | One kind protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721406898.8U CN207304494U (en) | 2017-10-26 | 2017-10-26 | One kind protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207304494U true CN207304494U (en) | 2018-05-01 |
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ID=62274673
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721406898.8U Active CN207304494U (en) | 2017-10-26 | 2017-10-26 | One kind protection circuit |
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| Country | Link |
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| CN (1) | CN207304494U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3826173A4 (en) * | 2018-07-19 | 2021-08-25 | ZTE Corporation | Power supply apparatus and method for power amplifier |
-
2017
- 2017-10-26 CN CN201721406898.8U patent/CN207304494U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3826173A4 (en) * | 2018-07-19 | 2021-08-25 | ZTE Corporation | Power supply apparatus and method for power amplifier |
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