CN209218057U - A kind of field-effect tube driving circuit - Google Patents
A kind of field-effect tube driving circuit Download PDFInfo
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- CN209218057U CN209218057U CN201822120676.0U CN201822120676U CN209218057U CN 209218057 U CN209218057 U CN 209218057U CN 201822120676 U CN201822120676 U CN 201822120676U CN 209218057 U CN209218057 U CN 209218057U
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- 230000005669 field effect Effects 0.000 title claims abstract description 29
- 239000003381 stabilizer Substances 0.000 claims description 30
- 230000005611 electricity Effects 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000003760 hair shine Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000000087 stabilizing effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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Abstract
The utility model discloses a kind of field-effect tube driving circuits, including the totem pole configuration being made of triode Q1 and triode Q2, resistance R1 and resistance R2；PWM generator is connected to the input terminal of totem pole configuration by resistance R1; the output end of totem pole configuration is connected to the grid of field-effect tube Q3; the source electrode of field-effect tube Q3 is grounded; drain electrode meets busbar voltage VBUS by transformer T1; applied voltage signal VIN is connected on totem pole configuration; it is characterized in that, further including the first bleeder circuit, the second bleeder circuit, overvoltage crowbar and photocoupler P1；The field-effect tube driving circuit has the advantage that first, does not carry out gate driving protection using the voltage sample chip of higher cost and MCU and DSP control chip.Second, Programmable detection is not depended on, cumbersome control needed for a large amount of triodes is not depended on, reduces the risk of shielding failure.Third, circuit is simple and practical, and versatility is relatively strong and has taken into account over-voltage and under-voltage duplicate protection.
Description
Technical field
The utility model relates to electronic circuit technology field, in particular to a kind of field-effect tube driving circuit.
Background technique
Currently, most common over-voltage, under-voltage protection technology mainly use following several thinkings.First is that using operational amplifier
Or center of the comparator as controlling unit, monitoring point voltage is compared with TL431 reference voltage, to realize to prison
The detection and control of measuring point voltage.Guangzhou Jinshengyang Science and Technology Co., Ltd applied for utility model patent " over voltage in 2015
Protect control circuit " it is exactly using two operational amplifiers respectively to the over-voltage of sampled point and under-voltage carry out sample detecting, foundation
The height of input signal is compared with reference signal, to export the logical of the protection triode of corresponding logic level control rear class
It is disconnected, realize the protection to target point signal." a kind of band is stagnant for the abundant Science and Technology Ltd.'s application utility model patent in Luoyang in 2018
The over under-voltage protection circuit returned " it is using the relatively faster comparator of arithmetic speed as the control centre for protecting circuit.Second is that
Using DSP, MCU as control centre, by designing reliable logic control program, realize acquisition to sampled point signal,
Compare and controls and protect.Beijing Dongliyuan Technology Co., Ltd applies for a kind of utility model patent " driving within 2014
Protect circuit ", it is to control drive control circuit using a DSP as core.Drive control circuit detects driving circuit signal
Short circuit and over-voltage.When a failure occurs it, control driving circuit act in time quickly disconnection driving circuit reach driving defencive function.
Third is that using a large amount of NPN, perhaps PNP is combined through low and high level to each transistor base or collector and transmitting
Pole carries out controlling to reach detecting and controlling target point voltage.
For above method, disadvantage is, first, designing phase for the design using operational amplifier and comparator
To complexity, higher cost, and utilize PCB arrangement space larger.Second, CPU controls relatively pure circuit control, it is not only at high cost
And artificial design logic program is needed, while introducing excessive component, increase fault point, reduces the reliable of protection circuit
Property.Third, largely triode is used to make principle more complicated, control is more cumbersome, and reliability is relatively low.
If Fig. 1 is common N-channel MOS FET tube drive circuit.Q1, Q2 form totem pole configuration, reinforce front stage every
From.PWM generator issues PWM original burst signal waveform, drives totem by resistance R1.It is driven by the low and high level of PWM
Q1's and Q2 is respectively turned on, to issue the grid that the PWM drive signal that a string of amplitudes are VIN drives MOSFET pipe.When VIN mistake
When high or too low, the amplitude corresponding change of PWM drive signal, to influence the conduction property of MOSFET pipe.When being more than
When the limiting voltage range that MOSFET tube grid allows, then causes MOSFET pipe to damage, cause work abnormal in circuit.
Utility model content
The purpose of the utility model is to provide a kind of Drive Protecting Circuit field-effect tube driving circuits.
For this purpose, technical solutions of the utility model are as follows:
A kind of field-effect tube driving circuit, including the totem pole configuration being made of triode Q1 and triode Q2, resistance R1
With resistance R2；PWM generator is connected to the input terminal of totem pole configuration by resistance R1, and the output end of totem pole configuration is connected to
The grid of field-effect tube Q3, the source electrode ground connection of field-effect tube Q3, drain electrode connect busbar voltage VBUS, totem knot by transformer T1
Applied voltage signal VIN is connected on structure, which is characterized in that further include the first bleeder circuit, the second bleeder circuit, overvoltage protection
Circuit and photocoupler P1；
First bleeder circuit is arranged between applied voltage signal VIN and GND, including being sequentially connected in series diode together
D1, resistance R6 and resistance R7；The anode of diode D1 meets applied voltage signal VIN, cathode connecting resistance R6, resistance R6 and resistance R7
Between route on be formed with dividing point A；
Second bleeder circuit is arranged between busbar voltage VBUS and GND, including being sequentially connected in series resistance R3, electricity together
R4 and resistance R5 is hindered, the one of resistance R3 terminates busbar voltage VBUS, another terminating resistor R4, the line between resistance R4 and resistance R5
Road is formed with dividing point B；
Overvoltage crowbar includes voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2, voltage-stabiliser tube ZD3 and triode Q4, the base of triode Q4
Pole passes sequentially through voltage-stabiliser tube ZD3, voltage-stabiliser tube ZD2 and voltage-stabiliser tube ZD1 and is connected on the route between resistance R6 and resistance R7, three poles
The emitter of pipe Q4 is grounded, and the collector of triode Q4 connects the grid of field-effect tube Q3；
Photocoupler P1 includes light emitting diode and phototriode；The anode of light emitting diode is connected to dividing point B,
The cathode of light emitting diode is connected to dividing point A, and the collector of phototriode connects PWM original burst signal, phototriode
Emitter meet GND.
Further, the both ends of the resistance R7 are parallel with capacitor C1.
Further, the both ends of the resistance R5 are parallel with voltage-stabiliser tube ZD4, the plus earth of voltage-stabiliser tube ZD4.
Compared with prior art, which has the advantage that first, not using higher cost
Voltage sample chip and MCU and DSP control chip carry out gate driving protection.Second, Programmable detection is not depended on, is not depended on big
Cumbersome control needed for measuring triode, reduces the risk of shielding failure.Third, circuit is simple and practical, and versatility is relatively strong and takes into account
Over-voltage and under-voltage duplicate protection.
Detailed description of the invention
Fig. 1 is the circuit diagram of currently used field-effect tube driving circuit.
Fig. 2 is field-effect tube driving circuit figure provided by the utility model.
Specific embodiment
With reference to the accompanying drawing and specific embodiment is described further the utility model, but following embodiments are right absolutely not
The utility model has any restrictions.
A kind of field-effect tube driving circuit, as shown in Fig. 2, including the totem knot being made of triode Q1 and triode Q2
Structure, resistance R1 and resistance R2；PWM generator is connected to the input terminal of totem pole configuration by resistance R1, totem pole configuration it is defeated
Outlet is connected to the grid of field-effect tube Q3, the source electrode ground connection of field-effect tube Q3, and drain electrode connects busbar voltage by transformer T1
VBUS is connected with applied voltage signal VIN on totem pole configuration, which is characterized in that further includes the first bleeder circuit, the second partial pressure
Circuit, overvoltage crowbar and photocoupler P1；
First bleeder circuit is arranged between applied voltage signal VIN and GND, including being sequentially connected in series diode together
D1, resistance R6 and resistance R7；The anode of diode D1 meets applied voltage signal VIN, cathode connecting resistance R6, resistance R6 and resistance R7
Between route on be formed with dividing point A；
Second bleeder circuit is arranged between busbar voltage VBUS and GND, including being sequentially connected in series resistance R3, electricity together
R4 and resistance R5 is hindered, the one of resistance R3 terminates busbar voltage VBUS, another terminating resistor R4, the line between resistance R4 and resistance R5
Road is formed with dividing point B；
Overvoltage crowbar includes voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2, voltage-stabiliser tube ZD3 and triode Q4, the base of triode Q4
Pole passes sequentially through voltage-stabiliser tube ZD3, voltage-stabiliser tube ZD2 and voltage-stabiliser tube ZD1 and is connected on the route between resistance R6 and resistance R7, three poles
The emitter of pipe Q4 is grounded, and the collector of triode Q4 connects the grid of field-effect tube Q3；
Photocoupler P1 includes light emitting diode and phototriode；The anode of light emitting diode is connected to dividing point B,
The cathode of light emitting diode is connected to dividing point A, and the collector of phototriode connects PWM original burst signal, phototriode
Emitter meet GND.
The both ends of the resistance R7 are parallel with capacitor C1.
The both ends of the resistance R5 are parallel with voltage-stabiliser tube ZD4, the plus earth of voltage-stabiliser tube ZD4.
The resistance value size of the resistance R5 is 1K Ω, and the resistance value size of the resistance R6 is 2K Ω.
The working principle of field-effect tube driving circuit provided by the utility model is as follows:
When VIN voltage is excessively high, the voltage of dividing point A is raised simultaneously, when A point voltage is more than 0.7v, triode Q4 conducting；
At this point, the driving current of field-effect tube Q3 grid is pulled low rapidly, the grid overvoltage protection to field-effect tube Q3 is realized；By electricity
Resistance R3, resistance R4 and resistance R5 composition another group of bleeder circuit be connected with busbar voltage VBUS, while in linear optical coupling
The cathode of light emitting diode is connected.It is equal with the voltage UA of dividing point A to enable the voltage UB of dividing point B, while at resistance R5
One voltage-stabiliser tube ZD4 of parallel connection；When the voltage drop of dividing point A is as low as threshold value, linear photoconductor couples two pole of pipe P1 internal illumination
Pipe conducting, NPN type phototriode P1 conducting realize pair at this point, the driving current of field-effect tube Q3 grid is pulled low rapidly
The grid under-voltage protection of field-effect tube Q3 is limited to the specification and circuit of voltage-stabiliser tube in the size and voltage regulator circuit of VIN voltage
Efficiency requirement, can determine the quantity of series voltage stabilizing pipe according to actual needs.
Come according to the minimum on state threshold voltage of grid and highest withstand voltage value of field-effect tube in specifications (MOSFET pipe)
The pressure stabilizing value for adjusting voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2, voltage-stabiliser tube ZD3 and voltage-stabiliser tube ZD4 can also adjust steady according to actual needs
The pressure stabilizing value of pressure pipe.By adjusting dividing point A voltage determine whether for 2/3 times of driving pulse crest voltage to be adjusted to 1/2 times,
3/5 times or other, protection precision can be increased, expand or shrink protection scope.
Claims (3)
1. a kind of field-effect tube driving circuit, including the totem pole configuration being made of triode Q1 and triode Q2, resistance R1 and
Resistance R2；PWM generator is connected to the input terminal of totem pole configuration by resistance R1, and the output end connection of totem pole configuration is shown up
The grid of effect pipe Q3, the source electrode ground connection of field-effect tube Q3, drain electrode connect busbar voltage VBUS, totem pole configuration by transformer T1
On be connected with applied voltage signal VIN, which is characterized in that further include the first bleeder circuit, the second bleeder circuit, overvoltage protection electricity
Road and photocoupler P1；
First bleeder circuit is arranged between applied voltage signal VIN and GND, including be sequentially connected in series diode D1 together,
Resistance R6 and resistance R7；The anode of diode D1 meets applied voltage signal VIN, cathode connecting resistance R6, resistance R6 and resistance R7 it
Between route on be formed with dividing point A；
Second bleeder circuit is arranged between busbar voltage VBUS and GND, including being sequentially connected in series resistance R3, resistance R4 together
With resistance R5, termination busbar voltage VBUS, an another terminating resistor R4 of resistance R3, on the route between resistance R4 and resistance R5
It is formed with dividing point B；
Overvoltage crowbar includes voltage-stabiliser tube ZD1, voltage-stabiliser tube ZD2, voltage-stabiliser tube ZD3 and triode Q4, the base stage of triode Q4 according to
It is secondary to be connected on the route between resistance R6 and resistance R7 by voltage-stabiliser tube ZD3, voltage-stabiliser tube ZD2 and voltage-stabiliser tube ZD1, triode Q4
Emitter ground connection, the collector of triode Q4 connects the grid of field-effect tube Q3；
Photocoupler P1 includes light emitting diode and phototriode；The anode of light emitting diode is connected to dividing point B, shines
The cathode of diode is connected to dividing point A, and the collector of phototriode connects PWM original burst signal, the hair of phototriode
Emitter-base bandgap grading meets GND.
2. field-effect tube driving circuit according to claim 1, which is characterized in that the both ends of the resistance R7 are parallel with
Capacitor C1.
3. field-effect tube driving circuit according to claim 2, which is characterized in that the both ends of the resistance R5 are parallel with
Voltage-stabiliser tube ZD4, the plus earth of voltage-stabiliser tube ZD4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822120676.0U CN209218057U (en) | 2018-12-18 | 2018-12-18 | A kind of field-effect tube driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822120676.0U CN209218057U (en) | 2018-12-18 | 2018-12-18 | A kind of field-effect tube driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209218057U true CN209218057U (en) | 2019-08-06 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822120676.0U Expired - Fee Related CN209218057U (en) | 2018-12-18 | 2018-12-18 | A kind of field-effect tube driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209218057U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111614265A (en) * | 2020-06-11 | 2020-09-01 | 深圳市蓝丝腾科技有限公司 | Power supply with high-power driven 5G communication base station |
| CN117439588A (en) * | 2023-11-20 | 2024-01-23 | 扬州曙光光电自控有限责任公司 | Negative-pressure IGBT driving circuit with undervoltage protection function based on discrete device construction |
-
2018
- 2018-12-18 CN CN201822120676.0U patent/CN209218057U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111614265A (en) * | 2020-06-11 | 2020-09-01 | 深圳市蓝丝腾科技有限公司 | Power supply with high-power driven 5G communication base station |
| CN111614265B (en) * | 2020-06-11 | 2021-05-11 | 衡阳市井恒电子产品有限公司 | Power supply with high-power driven 5G communication base station |
| CN117439588A (en) * | 2023-11-20 | 2024-01-23 | 扬州曙光光电自控有限责任公司 | Negative-pressure IGBT driving circuit with undervoltage protection function based on discrete device construction |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190806 |