CN104901662B - A kind of circuit for avoiding leading-edge overshoot - Google Patents
A kind of circuit for avoiding leading-edge overshoot Download PDFInfo
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- CN104901662B CN104901662B CN201510250438.XA CN201510250438A CN104901662B CN 104901662 B CN104901662 B CN 104901662B CN 201510250438 A CN201510250438 A CN 201510250438A CN 104901662 B CN104901662 B CN 104901662B
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Abstract
The invention discloses a kind of circuit for avoiding leading-edge overshoot, including power termination or power transmission load；Power switch pipe Q2；RC circuits often；Often control and performance optimization resistance R2, the control signal with the RC control overshoot signal shielding switching tubes of circuit cooperation often Q1；Signal shielding switching tube Q1 is overshooted, for shielding the leading-edge overshoot of current sampling signal caused by power switch pipe Q2；And system protection circuit.The beneficial effects of the invention are as follows：The leading-edge overshoot that detected signal caused by having avoided switching tube Q2 is carried; realize and accomplish protection circuit to realize power switch pipe each work period can monitor protection; and to it is all by low and high level controlling switch pipe switch and the caused signal with leading-edge overshoot is all practical; with practical; circuit structure is simple; debugging is convenient, the characteristics of low manufacture cost.
Description
Technical field
The present invention relates to a kind of circuit for avoiding leading-edge overshoot, it is related to electronic circuit control technology field.
Background technology
Have power switch participate in electronic circuit it is more and more extensive apply to actual life, such as Switching Power Supply, motor
Driving, high-frequency heating etc..Power switch pipe serves as the core realized power output and adjust watt level in these areas
Part, but it is easily worn part again, if circuit system is not protected or protection circuit response is slower, power switch pipe will
Damage is very easy to, so as to influence the stability of system.
In order to allow power switch to be in control protection, engineers devise various protection circuits, some electric currents
Transformer sampling current signal, but current transformer is mainly to apply to the occasion that current signal is AC signal, such as full-bridge
In circuit and half-bridge circuit, if unipolarity circuit, then current transformer is generally used for before rectifier bridge, what it was sampled to
Signal frequency is exactly power frequency at the soonest, so for unipolar direct current signal, the protection circuit that Current Transformer is done is difficult
Realize that the power switch pipe for allowing working frequency to exceed power frequency can obtain detection protection in each cycle of its real work, separately
Outside, it is generally higher than the sampling cost made of sampling resistor to do the cost sampled for current transformer.And in fact, when switching tube is opened
When, the power current by inductive load is theoretically a triangular wave, if removing sampling current with sample resistance, according to ohm
Law, the voltage on sample resistance will be strict and directly proportional electric current triangular waves, and its peak value appears in the wink that switching tube turns off
Between, this feature causes designers to hold very much realization to the control for the current peak for flowing through switching tube, but in fact, due to one
The capacitance characteristic that a little parasitic capacitances and buffer circuit etc. are brought so that the current signal for flowing through switching tube is not preferable triangle
Ripple, and an overshoot occurs in the forward position of preferable triangular wave, and because power termination requires that loop of power circuit impedance can not be big,
Plus the heating problem for considering sampling resistor, so the general value of sampling resistor all very littles, but according to Ohm's law it, the resistance
Voltage signal after sampling also very little, and semiconductor element has a conducting voltage, this carries leading-edge overshoot electric current to processing
Sampled signal brings difficulty, if allowing protection circuit directly to judge current sampling signal, then protection circuit is often
This of short duration overshoot signal of current sampling waveform can be judged by accident into flowing through having as caused by power termination for power switch pipe
The current peak of effect, so, protection circuit can do the shut-off protection to make mistake to power switch pipe, therefore much adopt
Sample resistance sampling current waveform does the circuit protected, and will typically average after the filtering of whole signal smoothing carries out protection and sentence
Disconnected, so, the response speed of protection circuit cannot keep up with each cycle of power switch pipe work, such protection
The performance of circuit is much unable to catch up with that the protection electricity that can realize each cycle of power switch pipe monitoring protection can be accomplished again
Road, and the performance of protection circuit directly affects the performance of whole system.
The content of the invention
It is an object of the invention to provide a kind of circuit for avoiding leading-edge overshoot, energy overcome the deficiencies in the prior art, can allow
Protection circuit accurately avoids the leading-edge overshoot signal in sampling current signal.
The purpose of the present invention is achieved through the following technical solutions：A kind of circuit for avoiding leading-edge overshoot, it includes:
Power termination or power transmission load, one end connect the power supply that can provide power energy；
Power switch pipe Q2, caused current signal is that the current sampling with leading-edge overshoot is believed in the course of the work
Number, in both ends of the power switch pipe Q2 in addition to control terminal, wherein one end connection power termination or power transmission load, the other end connects
Then the current signal sampling slip of power termination or power transmission load, current signal sampling slip are used to produce power termination
Or the current sampling signal of power transmission load, the current sampling signal is often with leading-edge overshoot, current sampling signal branch road
In be provided with sample resistance R3, a sample resistance R3 termination switching tube Q2, other end ground connection, power switch pipe Q2 control pole
A branch road is connected with, the branch road is used to produce or transimission power switching tube Q2 driving control signal；
RC circuits often, one end of circuit is connected RC with branch road where power switch pipe Q2 driving control signal often,
The other end is connected to branch road where overshooting signal shielding switching tube Q1 control pin；
Often control and performance optimization resistance R2, the control with the RC control overshoot signal shielding switching tubes of circuit cooperation often Q1
Signal processed, its one end take over branch road where the control pin for rushing signal shielding switching tube Q1, other end ground connection；
Signal shielding switching tube Q1 is overshooted, for shielding the forward position mistake of current sampling signal caused by power switch pipe Q2
Punching, branch road where Q1 control pin connect RC circuits often, and the Q1 terminating systems protection circuit of switch pin one is another to terminate to ground；
System protection circuit, for controlling power switch pipe Q1 driving control signal to export, it can match somebody with somebody and overshoot signal
The control signal co-ordination that mask switch pipe Q1 is sent, respectively with branch road where power switch pipe Q2 driving control signal,
Branch road and Q1 switch pin connection where current sampling signal.
It also includes performance optimization discharge diode D1, and an end is connected on RC often on circuit, other end ground connection.
Often electric routing resistance R1's described RC and electric capacity C1 are in series, meanwhile, resistance R1 and electric capacity C1 position are
It is interchangeable.
Described overshoot signal shielding switching tube Q1 can use NPN triode or FET and can use identical use
Other switching tubes of mode.
Described power switch pipe Q2 can use NPN triode, FET, IGBT pipes or can use identical occupation mode
Other switching tubes.
The beneficial effects of the present invention are：The forward position mistake that detected signal caused by having avoided switching tube Q2 is carried
Punching, realize and protection circuit accomplished to realize power switch pipe that each work period can monitor protection, and to it is all by
Low and high level controlling switch pipe switchs and the caused signal with leading-edge overshoot is all practical, has practical, circuit structure
Simply, debugging is convenient, the characteristics of low manufacture cost.
Brief description of the drawings
Fig. 1 is the structure chart of the present invention；
Fig. 2 is power switch tube drives waveform of the present invention and the preferable power termination current sampling letter under the drive waveforms
Number oscillogram；
Fig. 3 is that power switch tube drives waveform of the present invention and actual power termination current sampling under the drive waveforms are believed
Number oscillogram.
Wherein, 1- power terminations or power transmission load, branch road where 2- driving control signal, 3-RC circuits often, 4-
System protection circuit, branch road where 5- current sampling signals.
Embodiment
Technical scheme is further described below in conjunction with the accompanying drawings, but claimed scope is not limited to institute
State.
Such as Fig. 1, a kind of circuit for avoiding leading-edge overshoot, it includes:
Power termination or power transmission load 1, one end connects the power supply that can provide power energy；
Power switch pipe Q2, caused current signal is that the current sampling with leading-edge overshoot is believed in the course of the work
Number, in both ends of the power switch pipe Q2 in addition to control terminal, power switch pipe Q2 input connection power termination or power transmission
Load, power switch pipe Q2 output end are connected to the current signal sampling slip of power termination or power transmission load, electric current
Sample of signal branch road is used for the current sampling signal for producing power termination or power transmission load, the current sampling signal often band
There is leading-edge overshoot, be provided with sample resistance R3 in current sampling signal branch road, a sample resistance R3 termination switching tube Q2 is another
End ground connection, power switch pipe Q2 control pole be connected with a branch road, and the branch road is used to produce or transimission power switching tube Q2
Driving control signal, wherein, sample resistance R3 is mainly used to power termination or power transmission of the sampling by power switch pipe Q2
The electric current of load 1, its function are to lead to current signal to be converted into voltage signal, are sent to system protection circuit 4, allow the system to protect
Protection circuit 4 is judged, it is determined whether pipe Q2 must be closed to the power and makes shut-off protection immediately；
RC circuit 3 often, branch road 2 where one end of circuit 3 and power switch pipe Q2 driving control signal connects RC often
Connect, the other end is connected to branch road where overshooting signal shielding switching tube Q1 control pin；
Often control and performance optimization resistance R2, circuit 3 coordinates control overshoot signal shielding switching tube Q1's often with RC
Control signal, its one end take over branch road where the control pin for rushing signal shielding switching tube Q1, other end ground connection；
Signal shielding switching tube Q1 is overshooted, for shielding the forward position mistake of current sampling signal caused by power switch pipe Q2
Punching, branch road where Q1 control pin connect RC circuit 3 often, the Q1 terminating systems protection circuit 4 of switch pin one, it is another terminate to
Ground；
System protection circuit 4, for controlling power switch pipe Q1 driving control signal to export, it can match somebody with somebody and overshoot signal
The control signal co-ordination that mask switch pipe Q1 is sent, respectively with branch road 2 where power switch pipe Q2 driving control signal,
Branch road 5 and Q1 switch pin connection where current sampling signal.
It also includes performance optimization discharge diode D1, and an end is connected on RC often on circuit 3, other end ground connection.
Often circuit 3 is in series described RC by resistance R1 and electric capacity C1, meanwhile, resistance R1 and electric capacity C1 position are
It is interchangeable.
Described overshoot signal shielding switching tube Q1 can use NPN triode or FET and can use identical use
Other switching tubes of mode.
Described power switch pipe Q2 can use NPN triode, FET, IGBT pipes or can use identical occupation mode
Other switching tubes.
The power termination or the mostly inductive load, such as the transformer for transimission power of power transmission load 1, but not
It is confined to transformer.System protection circuit 4, it is mainly used to control the control signal output of power switch pipe, it can match somebody with somebody and overshoot
The signal coordinating work that signal shielding switching tube Q1 is sent, when overshooting signal shielding switching tube Q1 unlatching ground connection, protection electricity
Road No starting (do not judged the sampled signal of power termination electric current), when overshoot signal shielding switching tube Q1 shut-offs (with
Ground disconnects) when, protection circuit work (is not necessarily referring to the power switch pipe Q2 for controlling shut-off described immediately, but allows to bear power
Current-carrying sampled signal is judged), which control power switch pipe Q2 switching signal, is also connected with overshoot signal shielding
Switching branches where switching tube Q1 and the branch road where the current sampling signal of power termination.Overshoot signal shielding switching tube
Q1, opened when the open signal (high level) of power switch pipe Q2 control poles just arrives, instruction is provided for protection circuit, allow guarantor
Protection circuit not judge the current sampling signal of power termination that it controls termination RC circuits often, the switch of switching tube
Pin (the C pin and E pin, the D pin and S pin of FET etc. of such as triode) one is terminated to protection circuit, another to terminate to ground.Performance
Optimize diode D1, it be not necessarily it is necessary, with reference to system, the normal circuit when power switch pipe Q2 turn-off time allowing RC enough
When electric capacity in 3 fully resets, the performance optimization diode D1, which can be deleted directly, not to be had to, and performance optimization diode D1 is mainly used
To help to reset electric capacity C1s of the RC often in circuit 3, ensureing can be by RC often circuit 3 during power switch pipe Q2 shut-off
Electric capacity C1 fully reset and (fully bleed off the electric charge in the electric capacity), one termination RC circuit 3 often, other end ground connection.
Often control and performance optimization resistance R2, it controls shielding switching tube Q1 control signal with the RC cooperations of circuit 3 often, it is ensured that protects
While the leading-edge overshoot for the current sampling signal that protecting system can accurately avoid power termination, electric current of the and can to power termination
The useful component of sampled signal carries out precisely quickly judgement, and one termination control flow props up where covering switching tube Q1 control pin
Road, other end ground connection.A power switch pipe Q2 termination power termination, another termination sampling resistor, power switch pipe Q2 control
Circuit 3 is connected branch road often with RC where pin processed, power switch pipe Q2 openings when being high potential of the current potential at its node,
For low potential when, power switch pipe Q2 shut-off.It is main to use for sample resistance R3, its a termination switching tube, other end ground connection
To sample the electric current of the power termination 1 by power switch pipe Q2, its function is to lead to current signal to be converted into voltage signal, is sent
Toward system protection circuit 4, the system protection circuit 4 is allowed to judge, it is determined whether pipe Q2 must be closed to the power and made immediately
Go out shut-off protection.
Power switch pipe Q2 is generally FET and IGBT pipes, and its performance is when control pin connects sampling resistor one end to it
That pin when being high potential, power switch pipe Q2 is opened, and during unlatching, by formula (di/dt) * L=U, (wherein i is passes through
Inductive load current, t are the power switch pipe Q2 opening times, and U is the voltage at loaded cable both ends, because during the unlatching of switching tube
Between it is shorter, to be considered as U be constant constant in the t times that can open switching tube) deform to obtain i=(U/L) * t, so, such as Fig. 2,
In theory, electric current should be the power termination current sampling signal waveform shown in figure two, but in fact, due to some parasitic capacitances
The capacitance characteristic brought with buffer circuit etc. so that the current signal for flowing through switching tube is not preferable triangular wave, and resonable
The forward position for the triangular wave thought occurs an overshoot, Fig. 3, actual power load current sampled signal waveform, by analysis, this
Overshoot and power switch pipe Q2 drive signal are tightly synchronous, and this overshoot always appears in control system and sends unlatching
Signal leading edge, when control system, which sends high level to power switch pipe Q2, opens the power switch pipe Q2, RC circuits often
In electric capacity C1 also simultaneously obtain this signal and charge, its charging current is by overshooting signal shielding switching tube Q1 so that mistake
Signal shielding switching tube Q1 ground connection is rushed, so as to notify protection circuit, allows protection circuit to forbid work, at this moment, even it is electric from sampling
The overshoot signal of the power termination electric current obtained in resistance exceeds default Secure Threshold, protection circuit also will not output signal come it is strong
Compel power switch pipe Q2 shut-offs, it is worth mentioning at this point that this overshoot signal time is shorter, and switching tube is held to short-time current
Ability to bear during by ability than working long hours is strong, therefore this signal will not cause power switch pipe to damage, and otherwise design
Person, which obtains, to be redesigned or is adjusted to power termination part again, and allowing its parasitic capacitance value to drop to will not allow the overshoot to be damaged
Untill power switch pipe Q2, as the rising of electric capacity C1 charging voltages, charging current are less and less so that overshoot signal shielding is opened
Pin and ground disconnection that pipe Q1 connects protection circuit are closed, at this moment, protection circuit recovers normal work, starts to being taken from sampling resistor
The current signal of the power termination obtained monitors that, when this current signal is higher than default Secure Threshold, protection circuit is with regard to defeated
Go out cut-off signals to force power switch pipe Q2 to turn off, by adjusting resistance R1, often electric capacity C1 and control and performance optimization electricity
R2 value is hindered, can be easily achieved and allow overshoot signal shielding switching tube Q1 ground connection output shielded signals to make forbidding for protection circuit
The time of work is just about the time of current over pulse on (being slightly larger than) sample resistance, so as to which protection circuit can be avoided
The overshoot signal of power termination electric current is opened, and can accomplishes to monitor the current signal of effective power termination.Work as power switch
When pipe Q2 obtains low level cut-off signals, electric capacity C1 can by resistance R1, often control and performance optimization resistance R2 and optimization two
Pole pipe D1 resets (when using diode D1 is optimized), so as to be prepared for the next cycle of switching tube, so as to ensure that height
Fast protection circuit (can realize monitoring protection circuit to each mid-term of power switch pipe real work) can be normally orderly
Work.
Specific embodiment described herein is only to present invention explanation for example.The skill of the technical field of the invention
Art personnel can be made miscellaneous modification or supplement to described specific embodiment or be substituted using similar mode, but not
The spirit of the present invention can be deviateed or surmount scope defined in appended claims.It is all to use equivalent substitution or equivalent deformation
The technical scheme of formation, all fall within the protection domain of the claims in the present invention.
Claims (5)
- A kind of 1. circuit for avoiding leading-edge overshoot, it is characterised in that：It includes:Power termination or power transmission load (1), one end connect the power supply that can provide power energy；Power switch pipe Q2, caused current signal is the current signal with leading-edge overshoot in the course of the work, and power is opened Close in both ends of the pipe Q2 in addition to control terminal, wherein one end connection power termination or power transmission load (1), the other end is connected to work( Rate load or power transmission load (1) current signal sampling slip, current signal sampling slip be used for produce power termination or The current sampling signal of power transmission load (1), the current sampling signal carry leading-edge overshoot, set in current sampling signal branch road It is equipped with sample resistance R3, a sample resistance R3 termination switching tube Q2, other end ground connection, power switch pipe Q2 control pole connection There is a branch road, the branch road is used to produce or transimission power switching tube Q2 driving control signal；RC circuit (3) often, RC one end of circuit (3) and branch road (2) where power switch pipe Q2 driving control signal often Connection, the other end are connected to branch road where overshooting signal shielding switching tube Q1 control pin；Often control and performance optimization resistance R2, the control with the RC control overshoot signal shielding switching tubes of circuit (3) cooperation often Q1 Signal processed, its one end take over branch road where the control pin for rushing signal shielding switching tube Q1, other end ground connection；Signal shielding switching tube Q1 is overshooted, for shielding the leading-edge overshoot of current sampling signal caused by power switch pipe Q2, Branch road where Q1 control pin connects RC circuit (3) often, the Q1 terminating systems protection circuit (4) of switch pin one, it is another terminate to Ground；System protection circuit (4), for controlling power switch pipe Q2 driving control signal to export, it can match somebody with somebody and overshoot signal screen Cover the control signal co-ordination that switching tube Q1 is sent, respectively with branch road (2) where power switch pipe Q2 driving control signal, Branch road (5) and Q1 switch pin connection where current sampling signal, when overshooting signal shielding switching tube Q1 unlatching ground connection, institute System protection circuit (4) No starting is stated, when overshooting signal shielding switching tube Q1 shut-offs, system protection circuit (4) work Make, control power switch pipe Q2 switching signal, be also connected with overshoot switching branches where signal shielding switching tube Q1 with Branch road where the current sampling signal of power termination, signal shielding switching tube Q1 is overshooted, in power switch pipe Q2 control poles Opened when open signal just arrives, provide instruction for system protection circuit (4), system protection circuit (4) power is not born The current sampling signal of load is judged that it controls termination RC, and circuit, the switch pin one of switching tube are terminated to protection circuit often, It is another to terminate to ground.
- 2. the circuit according to claim 1 for avoiding leading-edge overshoot, it is characterised in that：It also includes performance optimization electric discharge two Pole pipe D1, D1 an end are connected on RC often on circuit (3), other end ground connection.
- 3. the circuit according to claim 1 or 2 for avoiding leading-edge overshoot, it is characterised in that：Described RC circuit (3) often It is in series by resistance R1 and electric capacity C1, meanwhile, resistance R1 and electric capacity C1 position are interchangeable.
- 4. the circuit according to claim 1 or 2 for avoiding leading-edge overshoot, it is characterised in that：Described overshoot signal shielding Switching tube Q1 can use NPN triode or FET and can use other switching tubes of identical occupation mode.
- 5. the circuit according to claim 1 or 2 for avoiding leading-edge overshoot, it is characterised in that：Described power switch pipe Q2 NPN triode, FET, IGBT pipes or other switching tubes that identical occupation mode can be used can be used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510250438.XA CN104901662B (en) | 2015-05-18 | 2015-05-18 | A kind of circuit for avoiding leading-edge overshoot |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510250438.XA CN104901662B (en) | 2015-05-18 | 2015-05-18 | A kind of circuit for avoiding leading-edge overshoot |
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| Publication Number | Publication Date |
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| CN104901662A CN104901662A (en) | 2015-09-09 |
| CN104901662B true CN104901662B (en) | 2017-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510250438.XA Active CN104901662B (en) | 2015-05-18 | 2015-05-18 | A kind of circuit for avoiding leading-edge overshoot |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102214987A (en) * | 2010-04-06 | 2011-10-12 | 大连精拓光电有限公司 | System for providing over-current protection for switching power converter |
| CN102340253A (en) * | 2010-07-19 | 2012-02-01 | 力林科技股份有限公司 | Power supply converting device with regulatable lead-edge-blanking time and overcurrent protection method thereof |
| CN104010399A (en) * | 2013-02-21 | 2014-08-27 | 美的集团股份有限公司 | Electromagnetic heating apparatus and control method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100007409A1 (en) * | 2008-07-14 | 2010-01-14 | Yen-Hui Wang | Method and Related Device for an Adjustable Leading Edge Blanking Device in a Power Supply Device |
-
2015
- 2015-05-18 CN CN201510250438.XA patent/CN104901662B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102214987A (en) * | 2010-04-06 | 2011-10-12 | 大连精拓光电有限公司 | System for providing over-current protection for switching power converter |
| CN102340253A (en) * | 2010-07-19 | 2012-02-01 | 力林科技股份有限公司 | Power supply converting device with regulatable lead-edge-blanking time and overcurrent protection method thereof |
| CN104010399A (en) * | 2013-02-21 | 2014-08-27 | 美的集团股份有限公司 | Electromagnetic heating apparatus and control method thereof |
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| CN104901662A (en) | 2015-09-09 |
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