CN102208802A - Power switching tube overcurrent detection and overcurrent protection circuit - Google Patents
Power switching tube overcurrent detection and overcurrent protection circuit Download PDFInfo
- Publication number
- CN102208802A CN102208802A CN2010102161211A CN201010216121A CN102208802A CN 102208802 A CN102208802 A CN 102208802A CN 2010102161211 A CN2010102161211 A CN 2010102161211A CN 201010216121 A CN201010216121 A CN 201010216121A CN 102208802 A CN102208802 A CN 102208802A
- Authority
- CN
- China
- Prior art keywords
- current
- power switch
- pipe
- switch pipe
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention provides a power switching tube overcurrent detection and overcurrent protection circuit, which comprises an overcurrent detection circuit and an overcurrent protection circuit. The overcurrent detection circuit comprises a sampling tube, a negative feedback circuit, a sampling resistor and a comparator, wherein the gate and source ends of the sampling tube are connected with the gate and source ends of a power switching tube to be detected; the negative feedback circuit can make the drain voltage of the sampling tube tend to be consistent with the drain voltage of the power switching tube; the sampling resistor is used for introducing current flowing through the sampling tube; and the comparator compares the voltage or current of the sampling resistor with an overcurrent reference voltage or current to judge whether the power switching tube has overcurrent or not to realize high-accuracy overcurrent detection. The overcurrent protection circuit comprises a latch used for receiving and latching a detected overcurrent signal, a power switching tube driving circuit and a mirror current tube circuit with a switch. When the switch is switched off, the mirror current tube circuit samples the current of the power switching tube driving circuit, and mirrors the sampled current into the current of the power switching tube to realize the overcurrent protection of the power switching tube.
Description
Technical field
The present invention relates to a kind of power switch pipe over-current detection and current foldback circuit.
Background technology
The turn-on and turn-off of power MOS pipe switch of utilizing switching amplifier, Switching Power Supply, charge pump realize the high efficiency conversion of signal and energy, have purposes more and more widely.This power MOS pipe switch has bigger electric current to flow through when conducting usually, if electric current has surpassed the limit of bearing of this power MOS pipe switch, permanent damage may take place this power MOS pipe switch.Therefore, in order to guarantee the reliability of device, electric current that must convection current overpower metal-oxide-semiconductor switch carries out continuous detecting, and can protect the power MOS pipe switch when electric current is excessive.
About the detection of the electric current of convection current overpower metal-oxide-semiconductor switch, present the most widely used method as shown in Figure 1, its core concept is proposed by U.S. Pat 4553019.In Fig. 1, P type power MOS pipe switch 1 links to each other with drain terminal 8 separately with the grid end 7 of sampling metal-oxide-semiconductor 2, and the source end 10 of sampling metal-oxide-semiconductor 2 is R by a resistance value
S1Sampling resistor 3 be connected to power vd D, the source end of power MOS pipe switch 1 is directly connected to supply voltage VDD.The dimension scale of power MOS pipe switch 1 and sampling metal-oxide-semiconductor 2 is N: 1.The common port 10 of sampling metal-oxide-semiconductor 2 and sampling resistor 3 is linked the negative input of a comparator 6, and current value is I
REF1 Current source 5 be R with resistance value
REF1The common port 11 of resistance 4 on produce reference voltage V
REF1, this voltage is added to the positive input of comparator 6.When the electric current that flows through power MOS pipe switch 1 hour, the electric current that flows through sampling metal-oxide-semiconductor 2 is also less, the voltage V of comparator 6 negative inputs
S1The voltage V that is higher than positive input
REF1, so comparator 6 output low levels.When the electric current that flows through power MOS pipe switch 1 was higher, the electric current that flows through sampling metal-oxide-semiconductor 2 was also higher, causes V
S1Descend; Voltage V when comparator 6 negative inputs
S1Be lower than the voltage V of positive input
REF1The time, comparator 6 output high level, expression power MOS pipe switch generation overcurrent.The shortcoming of this implementation method is, owing to there is sampling resistor 3, make that the source voltage terminal of power MOS pipe switch 1 and sampling metal-oxide-semiconductor 2 is inconsistent, cause flowing through the electric current and the non-linear relation of electric current that flows through power MOS pipe switch 1 of sampling metal-oxide-semiconductor 2, so it not real equal proportion sampling electric current; Sampling be actually voltage on power MOS pipe switch 1 drain terminal 8, and this voltage and reference voltage V
REF1Relatively, estimate the electric current that flows through power MOS pipe switch 1 by metal-oxide-semiconductor linear zone current formula.U.S. Pat 5670227 has been set forth above-mentioned principle.The problem of bringing like this is R
REF1And I
REF1The accuracy of the deviation of absolute value, the process deviation of metal-oxide-semiconductor and metal-oxide-semiconductor linear zone current formula all can be brought sizable detection error of the electric current of convection current overpower metal-oxide-semiconductor switch.The most important thing is detected voltage V
S1With the electric current that flows through power MOS pipe switch 1 be not linear relationship, therefore can't be with program to V
S1Thereby revise the mistake flow point of accurately adjusting power MOS pipe switch 1.Same problem is present in U.S. Pat 6479975 and US7403365.Excessive detection error can cause that being difficult in the design hold, if set over-current detection point low excessively, can cause the too early protection than heavy load the time, can shut down automatically during as the big volume of audio frequency amplifier output; If with over-current detection point set too high, can cause protection to be lost efficacy again, cause device failure.Therefore, power MOS pipe switch over-current protective device need possess the more over-current detecting method of high accuracy, higher controllability reliably.
About the power MOS pipe switch being detected the safeguard measure behind the overcurrent, adopt the method for switch-off power metal-oxide-semiconductor switch usually, the big electric current that flows through the power MOS pipe switch is disappeared immediately.This method has reasonable protection effect for faults such as short circuits, but unfavorable for contingent instantaneous overload situation in the system.When instantaneous overload took place, of short duration over-current signal will trigger protection mechanism, and rupturing duty metal-oxide-semiconductor switch quits work system.A kind of improved method is to add self-resetting devices, and whether its principle is to open the power MOS pipe switch once more behind the time-delay certain hour, detect overcurrent condition and disappear.Yet, recovering means certainly even added, still there is the state that interrupts output in power MOS pipe, and this rigid protecting method can have a strong impact on the operate as normal of some systems that continuity is had relatively high expectations.
Summary of the invention
The object of the present invention is to provide a kind of high-precision power switch pipe over-current detection and current foldback circuit.
Reach other purposes in order to achieve the above object, power switch pipe over-current detection provided by the invention and current foldback circuit comprise: over-current detection circuit and the current foldback circuit that is connected described over-current detection circuit output.
Over-current detection circuit comprises: grid, source end respectively with the grid of power switch pipe to be detected, the sampling pipe that the source end is connected; The negative-feedback circuit that comprises amplifier, wherein, the drain terminal of described sampling pipe and power switch pipe to be detected is connected to two inputs of described amplifier, feeds back to described sampling pipe after the two drain terminal voltage differences that are used for inserting are amplified so that the drain terminal voltage of the drain terminal voltage of described sampling pipe and described power switch pipe to be detected reaches unanimity; Be used for the sampling resistor of incoming stream through the electric current of described sampling pipe; And be connected with described sampling resistor, so that the overcurrent reference voltage of the voltage of described sampling resistor or electric current and access or electric current compared so that judge the whether comparator of overcurrent of described power switch pipe to be detected;
Preferable, described sampling resistor can be the numerical digit adjustable resistance; Thus, the power switch pipe over-current detection circuit can comprise that also one is connected with described numerical digit adjustable resistance and is used to regulate the Programmable Logic Controller of resistance.
Current foldback circuit comprises: be connected the over-current detection circuit output and be used to receive and latch the latch of detected over-current signal; The power switch tube drives circuit that comprises current source, its Enable Pin with the power switch pipe of power switch pipe to be detected and described detection is connected, be used for the control signal that inserts according to described Enable Pin, determine that with one electric current carries out charge or discharge to the grid end of described power switch pipe to be detected; And the image current pipe circuit of belt switch; wherein; described switch is connected the output of described latch; so that the control signal according to described latch output opens and closes; and when described switch closure; definite electric current of the described power switch tube drives circuit of described image current pipe circuit sampling, and mirror image becomes the electric current flow through described power switch pipe to be detected is to realize the current-limiting protection to described power switch pipe to be detected.
Preferable, when power switch pipe was P type metal-oxide-semiconductor, described latch comprised: first inverter, the reset terminal of the signal inversion that described Enable Pin is inserted is connected described first inverter output, input end of clock and the output of described comparator is connected, signal input part connects high level d type flip flop and the d type flip flop output signal is anti-phase afterwards as second inverter of the control signal of described switch.
Preferable, described power switch tube drives circuit comprises: first current source and second current source that electric current is determined, be subjected to signal controlling that described Enable Pin inserts so that described first current source to first controlled switch of the grid end charging of described power switch pipe to be detected and be subjected to signal controlling that described Enable Pin inserts so that second controlled switch of the grid end of described power switch pipe to be detected by described second current source discharge.
In sum; power switch pipe over-current detection of the present invention and current foldback circuit reach unanimity the drain terminal voltage of sampling pipe and the drain terminal voltage of power switch pipe by negative-feedback technology; can improve the precision of over-current detection thus; and when detecting overcurrent; adopt image current to come power tube is carried out current limliting, can effectively realize overcurrent protection.
Description of drawings
Fig. 1 is the circuit diagram of over-current detection circuit of the P type power MOS pipe switch of prior art.
Fig. 2 is the circuit diagram of P type power switch pipe over-current detection of the present invention and current foldback circuit.
Fig. 3 is the circuit theory diagrams of P type power switch pipe over-current detection circuit of the present invention.
Fig. 4 is the circuit diagram of P type power switch pipe over-current detection circuit of the present invention.
Fig. 5 is the circuit diagram of P type power switch pipe current foldback circuit of the present invention.
Fig. 6 is the circuit diagram of N type power switch pipe over-current detection of the present invention and current foldback circuit.
Embodiment
Below with reference to accompanying drawing power switch pipe over-current detection of the present invention and current foldback circuit are described in detail.
Embodiment one: in the present embodiment, and power switch pipe P type metal-oxide-semiconductor.
See also Fig. 2, power switch pipe over-current detection of the present invention and current foldback circuit comprise at least: over-current detection circuit and the current foldback circuit that is connected described over-current detection circuit output.
As shown in Figure 3, it is the schematic diagram of described over-current detection circuit.The grid end 25 of sampling metal-oxide-semiconductor 14 links to each other with the source end with the grid end of P type power MOS pipe switch 13 respectively with source end (VDD).The drain terminal 28 of the drain terminal 27 of power MOS pipe switch 13 and sampling metal-oxide-semiconductor 14 is connected respectively to two inputs of amplifier 18.The output of amplifier 18 feeds back to the drain terminal 28 of sampling metal-oxide-semiconductor 14 by negative feedback controller 19, and degenerative " empty short " effect can make the drain terminal voltage of the drain terminal voltage of sampling metal-oxide-semiconductor 14 and power MOS pipe switch 13 near consistent.This moment is because three terminal voltages of sampling metal-oxide-semiconductor 14 and power MOS pipe switch 13 are all approaching consistent, linear zone current formula according to metal-oxide-semiconductor can draw: the electric current that flows through sampling metal-oxide-semiconductor 14 is with to flow through the electric current of power MOS pipe switch 13 linear, their ratio approach the to sample ratio (being made as 1/N in the drawings) of metal-oxide-semiconductor 14 and the size of power MOS pipe switch 13.Flow through the electric current I of sampling metal-oxide-semiconductor 14
S2The inflow resistance value is R
S2Sampling resistor 21, and to form size on sampling resistor 21 be I
S2* R
S2Voltage V
S2Current value is I
REF2 Current source 23 be R with resistance value
REF2Resistance 22 to form sizes be I
REF2* R
REF2Voltage V
REF2These two voltages are two inputs 30 and 31 of input comparators 24 respectively.Produce the over-current detection signal on the output 32 of comparator 24.When the electric current I that flows through sampling metal-oxide-semiconductor 14
S2Greater than I
REF2* R
REF2/ R
S2The time, the level on the output 32 of comparator 24 overturns, and shows overcurrent takes place, and the electric current that flow through power MOS pipe switch 13 this moment is N*I
REF2* R
REF2/ R
S2By following formula as can be seen, the mistake flow point electric current of power MOS pipe switch 13 and the absolute value of resistance are irrelevant, therefore resistance R on integrated circuit diagram
REF2And R
S2Coupling when good, can set and cross flow point very accurately.Simultaneously, because detected voltage V
S2With the electric current that flows through power MOS pipe switch 13 be linear relationship, therefore can be with program to V
S2Thereby revise the mistake flow point of accurately adjusting power MOS pipe switch 13.For the ease of realizing, sampling resistor 21 can be arranged to the numerical digit adjustable resistance, use Programmable Logic Controller 20222 by the resistance value R of program to sampling resistor 21
S2Carry out the digitlization adjustment, thereby the mistake flow point of power MOS pipe switch 13 is carried out the digitlization adjustment.
Have numerous embodiments can realize the negative feedback controller that adopts in the technique scheme, with reach make sampling drain terminal voltage of metal-oxide-semiconductor and power MOS pipe switch drain terminal voltage near consistent purpose.Fig. 4 has provided the physical circuit of the negative feedback controller that adopts in the overcurrent detecting device technical scheme able to programme of the preferred P type of a kind of the present invention power MOS pipe switch.With reference to shown in Figure 4, the drain terminal of P type power MOS pipe switch 13 is connected to the positive input 27 of amplifier 18.The reverse input end 28 of amplifier 18 links to each other with the drain terminal of P type sampling metal-oxide-semiconductor 14.The output 29 of amplifier 18 is linked the grid end of P type metal-oxide-semiconductor 19.In embodiment shown in Figure 4, P type metal-oxide-semiconductor 19 is as the negative feedback controller, and its source end feeds back to the reverse input end 28 of amplifier 18.The drain terminal 30 of P type metal-oxide-semiconductor 19 is linked an end of sampling resistor 21, makes the electric current that flows through sampling metal-oxide-semiconductor 14 all flow into sampling resistor 21 by P type metal-oxide-semiconductor 19.Suppose that voltage on the positive input 27 of amplifier 18 is higher than the voltage on the reverse input end 28, and the multiplication factor of amplifier 18 is enough big, then the voltage on the output 29 of amplifier 18 uprises, the electric current that flows through P type metal-oxide-semiconductor 19 is diminished, thereby voltage on the reverse input end 28 of amplifier 18 is raise until near the voltage on the positive input 27.Suppose that voltage on the reverse input end 28 of amplifier 18 is higher than the voltage on the positive input 27, and the multiplication factor of amplifier 18 is enough big, the voltage decreases on the output 29 of amplifier 18 then, make the electrorheological that flows through P type metal-oxide-semiconductor 19 big, thereby voltage on the reverse input end 28 of amplifier 18 is reduced until near the voltage on the positive input 27.Therefore, it is consistent that this negative feedback loop can make voltage and the voltage on the reverse input end 28 on amplifier 18 positive inputs 27 level off to, thereby make the drain terminal voltage of sampling metal-oxide-semiconductor 14 and the drain terminal voltage of power MOS pipe switch 13 level off to consistent.
As shown in Figure 5, it is described current foldback circuit schematic diagram.Current value is I
P Current source 66 and 67 the common port grid end 25 of linking P type power MOS pipe switch 13.One end of current source 66 is linked power supply potential (VDD) by P type metal-oxide-semiconductor 56.One end of current source 67 links ground by N type metal-oxide-semiconductor 57.The Enable Pin 55 of P type power MOS pipe switch is linked metal-oxide- semiconductor 56 and 57 grid ends respectively.66,67,56, the 57 common P type power MOS pipe switch driving circuits of forming.When Enable Pin 55 input high levels of P type power MOS pipe switch, P type metal-oxide-semiconductor 56 ends, 57 conductings of N type metal-oxide-semiconductor, and current source 67 gives grid end 25 discharges of P type power MOS pipe switch 13 until earth potential, thereby makes 13 conductings of P type power MOS pipe switch.When Enable Pin 55 input low levels of P type power MOS pipe switch, 56 conductings of P type metal-oxide-semiconductor, N type metal-oxide-semiconductor 57 ends, and current source 66 gives grid end 25 chargings of P type power MOS pipe switch 13 until power supply potential, thereby P type power MOS pipe switch 13 is ended.The Enable Pin 55 of P type power MOS pipe switch is linked (Reset) end 59 that resets of d type flip flop (as latch) 60 by reverser 58.The over-current signal that the clock of d type flip flop 60 (Clk) end 32 receives from over-current detection circuit.The data of d type flip flop 60 (D) end 61 is connected to power supply potential.When high level occurring on the reset terminal 59 of d type flip flop 60, output low level on the output of d type flip flop 60 (Q) end 61.On the reset terminal 59 of d type flip flop 60, low level occurs, and when rising edge occurring on the clock end 32 of d type flip flop 60, export high level on the output 62 of d type flip flop 60; On the reset terminal 59 of d type flip flop 60, low level occurs, and when rising edge not occurring on the clock end 32 of d type flip flop 60, the level on the output 62 of d type flip flop 60 remains unchanged.The grid end of P type image current pipe 65 links to each other with drain terminal, and links to each other with the grid end 25 of P type power MOS pipe switch 13.One end of P type metal-oxide-semiconductor 64 links to each other with the source end of P type image current pipe 65, and the other end links to each other with power supply potential.The output 62 of d type flip flop 60 is linked the grid end 63 of P type metal-oxide-semiconductor 64 by reverser.When Enable Pin 55 input low levels of P type power MOS pipe switch, P type power MOS pipe switch 13 ends, on the reset terminal 59 of d type flip flop 60 high level appears at this moment, output low level on the output 62 of d type flip flop 60, thereby make and be high level on the P type metal-oxide-semiconductor 64 grid ends 63, P type metal-oxide-semiconductor 64 ends, so P type image current pipe 65 is not had an effect.To sum up, when P type power MOS pipe switch 13 ended, P type image current pipe 65 was not had an effect.When Enable Pin 55 input high levels of P type power MOS pipe switch, 13 conductings of P type power MOS pipe switch, this moment d type flip flop 60 reset terminal 59 on low level appears.When overcurrent takes place, rising edge appears on the clock end 32 of d type flip flop 60, export high level on the output 62 of d type flip flop 60, make on the P type metal-oxide-semiconductor 64 grid ends 63 and become low level, 64 conductings of P type metal-oxide-semiconductor, thereby the electric current I P that makes current source 67 flows through P type image current pipe 65, has limited the further decline of voltage on the grid end 25 of P type power MOS pipe switch 13, thereby has limited the further increase of the electric current that flows through P type power MOS pipe switch 13.According to image current relation, the electric current that flows through P type power MOS pipe switch 13 and the ratio of the electric current that flows through P type image current pipe 65 approach the ratio (being made as M/1 in the drawings) of P type power MOS pipe switch 13 and the size of P type image current pipe 65.To sum up, when 13 conductings of P type power MOS pipe switch, in case detect overcurrent, the electric current that flows through P type power MOS pipe switch 13 can be limited in M*I all the time
P, d type flip flop 60 is resetted up to Enable Pin 55 input low levels of P type power MOS pipe switch.
Embodiment two:
Present embodiment is a N type metal-oxide-semiconductor with the embodiment one different power switch pipes that are.
As shown in Figure 6, power switch pipe over-current detection and current foldback circuit comprise: over-current detection circuit and the current foldback circuit that is connected described over-current detection circuit output.
Wherein, over-current detection circuit comprises: sampling pipe 35, negative-feedback circuit, sampling resistor 42 and comparator 45.The grid of sampling pipe 35, source end are connected with grid, the source end of power switch pipe 34 respectively; Negative-feedback circuit comprises amplifier 39 and negative feedback controller (being N type metal-oxide-semiconductor) 40, the drain terminal of described sampling pipe 35 and power switch pipe 34 is connected to the input 48 and 47 of described amplifier 39, and output, source end and the drain terminal of sampling pipe 35 that the grid end of N type metal-oxide-semiconductor 40 connects amplifier 39 is connected, an end of drain terminal and sampling resistor 42 is connected; The other end of sampling resistor 42 connects power vd D, and its resistance is R
S3, it also can be the numerical digit adjustable resistance, controls its resistance by Programmable Logic Controller 202; The inverting input 40 of comparator 45 is connected with sampling resistor 42, and the common port 51 that normal phase input end is connected reference resistance 43 and current source 44 is connected with described sampling resistor.
Current foldback circuit comprises: the image current pipe circuit of latch, power switch tube drives circuit and belt switch.Described latch is a d type flip flop 75, and the reset terminal 74 of d type flip flop 75 is connected that the Enable Pin 69 of power switch pipe, input end of clock Clk are connected with the output 52 of described comparator 45, signal input part 76 connects high level (being VDD); Grid termination Enable Pin 69, the drain terminal of P type metal-oxide-semiconductor 70 in the power switch tube drives circuit (i.e. first controlled switch) connect power supply, source end and current source 72 and are connected; The other end 53 of current source 72 connects the grid end 53 of power switch pipe; One end of current source 73 connects the grid end 53 of power switch pipe, and the other end connects the drain terminal of N type metal-oxide-semiconductor 71 (i.e. second controlled switchs); The grid end of N type metal-oxide-semiconductor 71 connects Enable Pin 69, source end ground connection (being GND); The output 77 of the grid termination d type flip flop 75 of the switch 78 in the image current pipe circuit of belt switch, source end ground connection, drain terminal connect the source end of N type image current pipe 79; The drain terminal of N type image current pipe 79, grid end all are connected with the common gate end 53 of sampling pipe 35 and power switch pipe 34.
The operation principle of foregoing circuit and embodiment one are similar, so be not described in detail in this.
In sum; power switch pipe over-current detection of the present invention and current foldback circuit reach unanimity the drain terminal voltage of sampling pipe and the drain terminal voltage of power switch pipe by negative-feedback technology; can realize the high accuracy of over-current detection thus; and detecting over-current state simultaneously; limit the electric current that flows through power switch pipe by image current, can realize overcurrent protection thus power switch pipe.
The foregoing description just lists expressivity principle of the present invention and effect is described, but not is used to limit the present invention.Any personnel that are familiar with this technology all can make amendment to the foregoing description under spirit of the present invention and scope.Therefore, the scope of the present invention should be listed as claims.
Claims (11)
1. power switch pipe over-current detection and current foldback circuit is characterized in that comprising: over-current detection circuit and be connected the current foldback circuit of described over-current detection circuit output, wherein,
Described over-current detection circuit comprises:
Grid, source end respectively with the grid of power switch pipe to be detected, the sampling pipe that the source end is connected;
The negative-feedback circuit that comprises amplifier, the drain terminal of described sampling pipe and power switch pipe to be detected is connected to two inputs of described amplifier, feeds back to described sampling pipe after the two drain terminal voltage differences that are used for inserting are amplified so that the drain terminal voltage of the drain terminal voltage of described sampling pipe and described power switch pipe to be detected reaches unanimity;
Sampling resistor is used for the electric current of incoming stream through described sampling pipe; With
Comparator is connected with described sampling resistor, so that the overcurrent reference voltage of the voltage of described sampling resistor or electric current and access or electric current compared so that judge whether overcurrent of described power switch pipe to be detected;
Described current foldback circuit comprises:
Latch is connected the output of described comparator, is used for receiving and latching detected over-current signal;
The power switch tube drives circuit that comprises current source, be connected with the Enable Pin of the power switch pipe of described power switch pipe to be detected and described detection, be used for the control signal that inserts according to described Enable Pin, determine that with one electric current carries out charge or discharge to the grid end of described power switch pipe to be detected; With
The image current pipe circuit of belt switch; described switch is connected the output of described latch; so that the control signal according to described latch output opens and closes; and when described switch closure; definite electric current of the described power switch tube drives circuit of described image current pipe circuit sampling; and mirror image becomes the electric current flow through described power switch pipe to be detected, to realize the current-limiting protection to described power switch pipe to be detected.
2. power switch pipe over-current detection as claimed in claim 1 and current foldback circuit is characterized in that: described sampling resistor is the numerical digit adjustable resistance.
3. power switch pipe over-current detection as claimed in claim 2 and current foldback circuit is characterized in that also comprising: be connected with described numerical digit adjustable resistance and be used to regulate the Programmable Logic Controller of resistance.
4. power switch pipe over-current detection as claimed in claim 1 and current foldback circuit; it is characterized in that: when power switch pipe was P type metal-oxide-semiconductor, described latch comprised: first inverter, the reset terminal of the signal inversion that described Enable Pin is inserted is connected described first inverter output, input end of clock and the output of described comparator is connected, signal input part connects high level d type flip flop and the d type flip flop output signal is anti-phase afterwards as second inverter of the control signal of described switch.
5. power switch pipe over-current detection as claimed in claim 1 and current foldback circuit is characterized in that: described power switch tube drives circuit comprises: first current source and second current source that electric current is determined, be subjected to signal controlling that described Enable Pin inserts so that described first current source to first controlled switch of the grid end charging of described power switch pipe to be detected and be subjected to signal controlling that described Enable Pin inserts so that second controlled switch of the grid end of described power switch pipe to be detected by described second current source discharge.
6. power switch pipe over-current detection circuit is characterized in that comprising:
Grid, source end respectively with the grid of power switch pipe to be detected, the sampling pipe that the source end is connected;
The negative-feedback circuit that comprises amplifier, the drain terminal of described sampling pipe and power switch pipe to be detected is connected to two inputs of described amplifier, feeds back to described sampling pipe after the two drain terminal voltage differences that are used for inserting are amplified so that the drain terminal voltage of the drain terminal voltage of described sampling pipe and described power switch pipe to be detected reaches unanimity;
Sampling resistor is used for the electric current of incoming stream through described sampling pipe; With
Comparator is connected with described sampling resistor, so that the overcurrent reference voltage of the voltage of described sampling resistor or electric current and access or electric current compared so that judge whether overcurrent of described power switch pipe to be detected.
7. power switch pipe over-current detection circuit as claimed in claim 6 is characterized in that: described sampling resistor is the numerical digit adjustable resistance.
8. power switch pipe over-current detection circuit as claimed in claim 7 is characterized in that also comprising: be connected with described numerical digit adjustable resistance and be used to regulate the Programmable Logic Controller of resistance.
9. power switch pipe current foldback circuit is characterized in that comprising:
Latch is connected the output of the over-current detection circuit of power switch pipe to be detected, is used for receiving and latching detected over-current signal;
The power switch tube drives circuit that comprises current source, be connected with the Enable Pin of the power switch pipe of described power switch pipe to be detected and described detection, be used for the control signal that inserts according to described Enable Pin, determine that with one electric current carries out charge or discharge to the grid end of described power switch pipe to be detected; With
The image current pipe circuit of belt switch; described switch is connected the output of described latch; so that the control signal according to described latch output opens and closes; and when described switch closure; definite electric current of the described power switch tube drives circuit of described image current pipe circuit sampling; and mirror image becomes the electric current flow through described power switch pipe to be detected, to realize the current-limiting protection to described power switch pipe to be detected.
10. power switch pipe current foldback circuit as claimed in claim 9; it is characterized in that: when power switch pipe was P type metal-oxide-semiconductor, described latch comprised: first inverter, the reset terminal of the signal inversion that described Enable Pin is inserted is connected described first inverter output, input end of clock and the output of described comparator is connected, signal input part connects high level d type flip flop and the d type flip flop output signal is anti-phase afterwards as second inverter of the control signal of described switch.
11. power switch pipe current foldback circuit as claimed in claim 9 is characterized in that: described power switch tube drives circuit comprises: first current source and second current source that electric current is determined, be subjected to signal controlling that described Enable Pin inserts so that described first current source to first controlled switch of the grid end charging of described power switch pipe to be detected and be subjected to signal controlling that described Enable Pin inserts so that second controlled switch of the grid end of described power switch pipe to be detected by described second current source discharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102161211A CN102208802B (en) | 2010-06-29 | 2010-06-29 | Power switching tube overcurrent detection and overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102161211A CN102208802B (en) | 2010-06-29 | 2010-06-29 | Power switching tube overcurrent detection and overcurrent protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102208802A true CN102208802A (en) | 2011-10-05 |
| CN102208802B CN102208802B (en) | 2013-11-13 |
Family
ID=44697508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102161211A Active CN102208802B (en) | 2010-06-29 | 2010-06-29 | Power switching tube overcurrent detection and overcurrent protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102208802B (en) |
Cited By (27)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102427216A (en) * | 2011-01-28 | 2012-04-25 | 极创电子股份有限公司 | Automatic regulation protection detection circuit of power supply |
| CN102801294A (en) * | 2012-07-27 | 2012-11-28 | 北京市科通电子继电器总厂 | In-parallel sampling over-current protection circuit |
| CN102832599A (en) * | 2012-08-24 | 2012-12-19 | 电子科技大学 | Over-current protection circuit |
| CN103515922A (en) * | 2012-06-25 | 2014-01-15 | 中国人民解放军理工大学 | Self-recovery and overcurrent protection circuit for power amplifier integrated circuit |
| KR20140011932A (en) * | 2012-07-19 | 2014-01-29 | 페어차일드 세미컨덕터 코포레이션 | Over-current detection circuit and method for power switch |
| CN104882856A (en) * | 2015-05-25 | 2015-09-02 | 重庆大学 | High-precision over-current detection circuit |
| CN105162314A (en) * | 2015-09-10 | 2015-12-16 | 电子科技大学 | Over-current detection circuit for BUCK converter |
| CN105548672A (en) * | 2016-01-27 | 2016-05-04 | 深圳市瑞之辰科技有限公司 | Over-current detection circuit of power switch |
| CN106058796A (en) * | 2016-07-29 | 2016-10-26 | 中国电子科技集团公司第四十研究所 | Program-controlled over-current protection circuit and realization method thereof |
| CN106209041A (en) * | 2016-09-14 | 2016-12-07 | 英特格灵芯片(天津)有限公司 | A kind of current foldback circuit |
| CN106603050A (en) * | 2016-12-15 | 2017-04-26 | 苏州捷芯威半导体有限公司 | Integrated semiconductor power switching device |
| CN107528309A (en) * | 2017-09-05 | 2017-12-29 | 珠海格力节能环保制冷技术研究中心有限公司 | The circuit of Anti-surging electric current |
| CN108574259A (en) * | 2018-06-22 | 2018-09-25 | 深圳市高胜科研电子有限公司 | A kind of protective device of direct current supply, system and control method |
| CN109239449A (en) * | 2018-11-22 | 2019-01-18 | 中国电子科技集团公司第五十八研究所 | A kind of over-current detection circuit |
| WO2019057148A1 (en) * | 2017-09-23 | 2019-03-28 | 华为技术有限公司 | Power source protection apparatus and terminal using same |
| WO2019057144A1 (en) * | 2017-09-23 | 2019-03-28 | 华为技术有限公司 | Power source protection apparatus and terminal using same |
| CN109613328A (en) * | 2019-01-14 | 2019-04-12 | 电子科技大学 | A kind of quick over-current detection circuit of cross-coupling |
| CN109856435A (en) * | 2019-01-11 | 2019-06-07 | 深圳赛意法微电子有限公司 | The high pressure monitoring and protecting device of state latching circuit and the application circuit |
| CN110971216A (en) * | 2018-12-06 | 2020-04-07 | 宁德时代新能源科技股份有限公司 | Overcurrent protection circuit |
| CN111262228A (en) * | 2018-12-03 | 2020-06-09 | 华大半导体有限公司 | Current-limiting protection device and motor driving chip |
| CN111446706A (en) * | 2020-04-14 | 2020-07-24 | 合肥联宝信息技术有限公司 | Power supply protection method and device |
| CN111487498A (en) * | 2020-05-20 | 2020-08-04 | 广州思泰信息技术有限公司 | Distribution automation remote availability test system and method |
| CN112104348A (en) * | 2020-08-31 | 2020-12-18 | 深圳市优必选科技股份有限公司 | Protection circuit of MOS pipe |
| CN112558679A (en) * | 2019-09-25 | 2021-03-26 | 圣邦微电子（北京）股份有限公司 | Current-limiting protection circuit |
| CN112701663A (en) * | 2020-12-25 | 2021-04-23 | 上海东软载波微电子有限公司 | Overcurrent detection and protection circuit for power MOS (metal oxide semiconductor) tube and power MOS tube assembly |
| CN113655358A (en) * | 2021-07-13 | 2021-11-16 | 上海艾为电子技术股份有限公司 | Test circuit and power protection chip of power tube |
| CN116047147A (en) * | 2023-01-28 | 2023-05-02 | 苏州贝克微电子股份有限公司 | High-precision current detecting circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1574579A (en) * | 2003-06-24 | 2005-02-02 | 罗姆股份有限公司 | Switching type dc-dc converter |
| US6885532B2 (en) * | 2001-08-13 | 2005-04-26 | Yamaha Corporation | Current detection and overcurrent protection for transistors in pulse-width modulation amplifier |
| CN100367643C (en) * | 2003-12-19 | 2008-02-06 | 夏普株式会社 | Switching power supply apparatus and electric appliance therewith |
| CN100550560C (en) * | 2004-07-15 | 2009-10-14 | 罗姆股份有限公司 | Current foldback circuit |
-
2010
- 2010-06-29 CN CN2010102161211A patent/CN102208802B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6885532B2 (en) * | 2001-08-13 | 2005-04-26 | Yamaha Corporation | Current detection and overcurrent protection for transistors in pulse-width modulation amplifier |
| CN1574579A (en) * | 2003-06-24 | 2005-02-02 | 罗姆股份有限公司 | Switching type dc-dc converter |
| CN100367643C (en) * | 2003-12-19 | 2008-02-06 | 夏普株式会社 | Switching power supply apparatus and electric appliance therewith |
| CN100550560C (en) * | 2004-07-15 | 2009-10-14 | 罗姆股份有限公司 | Current foldback circuit |
Cited By (46)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102427216A (en) * | 2011-01-28 | 2012-04-25 | 极创电子股份有限公司 | Automatic regulation protection detection circuit of power supply |
| CN103515922A (en) * | 2012-06-25 | 2014-01-15 | 中国人民解放军理工大学 | Self-recovery and overcurrent protection circuit for power amplifier integrated circuit |
| CN103575964B (en) * | 2012-07-19 | 2016-03-23 | 快捷半导体(苏州)有限公司 | A kind of over-current detection circuit of power switch pipe and method |
| KR20140011932A (en) * | 2012-07-19 | 2014-01-29 | 페어차일드 세미컨덕터 코포레이션 | Over-current detection circuit and method for power switch |
| CN103575964A (en) * | 2012-07-19 | 2014-02-12 | 快捷半导体(苏州)有限公司 | Over-current detection circuit and method for power switch tube |
| US9551742B2 (en) | 2012-07-19 | 2017-01-24 | Fairchild Semiconductor Corporation | Circuit and method for overcurrent detection of power switch |
| KR102038428B1 (en) | 2012-07-19 | 2019-10-30 | 페어차일드 세미컨덕터 코포레이션 | Over-current detection circuit and method for power switch |
| CN102801294A (en) * | 2012-07-27 | 2012-11-28 | 北京市科通电子继电器总厂 | In-parallel sampling over-current protection circuit |
| CN102801294B (en) * | 2012-07-27 | 2016-05-11 | 北京市科通电子继电器总厂 | A kind of sampling current foldback circuit in parallel |
| CN102832599A (en) * | 2012-08-24 | 2012-12-19 | 电子科技大学 | Over-current protection circuit |
| CN102832599B (en) * | 2012-08-24 | 2014-07-30 | 电子科技大学 | Over-current protection circuit |
| CN104882856A (en) * | 2015-05-25 | 2015-09-02 | 重庆大学 | High-precision over-current detection circuit |
| CN105162314A (en) * | 2015-09-10 | 2015-12-16 | 电子科技大学 | Over-current detection circuit for BUCK converter |
| CN105548672A (en) * | 2016-01-27 | 2016-05-04 | 深圳市瑞之辰科技有限公司 | Over-current detection circuit of power switch |
| CN105548672B (en) * | 2016-01-27 | 2023-10-27 | 深圳市瑞之辰科技有限公司 | Overcurrent detection circuit of power switch |
| CN106058796B (en) * | 2016-07-29 | 2018-10-19 | 中国电子科技集团公司第四十一研究所 | A kind of program-controlled current foldback circuit and implementation method |
| CN106058796A (en) * | 2016-07-29 | 2016-10-26 | 中国电子科技集团公司第四十研究所 | Program-controlled over-current protection circuit and realization method thereof |
| CN106209041A (en) * | 2016-09-14 | 2016-12-07 | 英特格灵芯片(天津)有限公司 | A kind of current foldback circuit |
| CN106209041B (en) * | 2016-09-14 | 2023-05-30 | 四川易冲科技有限公司 | Overcurrent protection circuit |
| CN106603050A (en) * | 2016-12-15 | 2017-04-26 | 苏州捷芯威半导体有限公司 | Integrated semiconductor power switching device |
| CN107528309B (en) * | 2017-09-05 | 2019-04-05 | 珠海格力节能环保制冷技术研究中心有限公司 | The circuit of Anti-surging electric current |
| CN107528309A (en) * | 2017-09-05 | 2017-12-29 | 珠海格力节能环保制冷技术研究中心有限公司 | The circuit of Anti-surging electric current |
| WO2019057148A1 (en) * | 2017-09-23 | 2019-03-28 | 华为技术有限公司 | Power source protection apparatus and terminal using same |
| US11527883B2 (en) | 2017-09-23 | 2022-12-13 | Huawei Technologies Co., Ltd. | Power protection apparatus and terminal using the apparatus |
| WO2019057144A1 (en) * | 2017-09-23 | 2019-03-28 | 华为技术有限公司 | Power source protection apparatus and terminal using same |
| CN110416976A (en) * | 2017-09-23 | 2019-11-05 | 华为技术有限公司 | A kind of apparatus for protecting power supply and the terminal using described device |
| EP3678271A4 (en) * | 2017-09-23 | 2020-09-02 | Huawei Technologies Co., Ltd. | Power source protection apparatus and terminal using same |
| CN108574259A (en) * | 2018-06-22 | 2018-09-25 | 深圳市高胜科研电子有限公司 | A kind of protective device of direct current supply, system and control method |
| CN109239449A (en) * | 2018-11-22 | 2019-01-18 | 中国电子科技集团公司第五十八研究所 | A kind of over-current detection circuit |
| CN111262228A (en) * | 2018-12-03 | 2020-06-09 | 华大半导体有限公司 | Current-limiting protection device and motor driving chip |
| CN111262228B (en) * | 2018-12-03 | 2022-06-28 | 华大半导体有限公司 | Current-limiting protection device and motor driving chip |
| CN110971216A (en) * | 2018-12-06 | 2020-04-07 | 宁德时代新能源科技股份有限公司 | Overcurrent protection circuit |
| CN110971216B (en) * | 2018-12-06 | 2021-08-17 | 宁德时代新能源科技股份有限公司 | Overcurrent protection circuit |
| CN109856435A (en) * | 2019-01-11 | 2019-06-07 | 深圳赛意法微电子有限公司 | The high pressure monitoring and protecting device of state latching circuit and the application circuit |
| CN109856435B (en) * | 2019-01-11 | 2021-07-06 | 深圳赛意法微电子有限公司 | State latch circuit and high-voltage monitoring protection device applying same |
| CN109613328B (en) * | 2019-01-14 | 2020-11-27 | 电子科技大学 | Cross-coupling rapid overcurrent detection circuit |
| CN109613328A (en) * | 2019-01-14 | 2019-04-12 | 电子科技大学 | A kind of quick over-current detection circuit of cross-coupling |
| CN112558679A (en) * | 2019-09-25 | 2021-03-26 | 圣邦微电子（北京）股份有限公司 | Current-limiting protection circuit |
| CN111446706A (en) * | 2020-04-14 | 2020-07-24 | 合肥联宝信息技术有限公司 | Power supply protection method and device |
| CN111487498B (en) * | 2020-05-20 | 2022-03-25 | 广州思泰信息技术有限公司 | Distribution automation remote availability test system and method |
| CN111487498A (en) * | 2020-05-20 | 2020-08-04 | 广州思泰信息技术有限公司 | Distribution automation remote availability test system and method |
| CN112104348A (en) * | 2020-08-31 | 2020-12-18 | 深圳市优必选科技股份有限公司 | Protection circuit of MOS pipe |
| CN112701663A (en) * | 2020-12-25 | 2021-04-23 | 上海东软载波微电子有限公司 | Overcurrent detection and protection circuit for power MOS (metal oxide semiconductor) tube and power MOS tube assembly |
| CN112701663B (en) * | 2020-12-25 | 2023-10-20 | 上海东软载波微电子有限公司 | Overcurrent detection and protection circuit for power MOS tube and power MOS tube assembly |
| CN113655358A (en) * | 2021-07-13 | 2021-11-16 | 上海艾为电子技术股份有限公司 | Test circuit and power protection chip of power tube |
| CN116047147A (en) * | 2023-01-28 | 2023-05-02 | 苏州贝克微电子股份有限公司 | High-precision current detecting circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102208802B (en) | 2013-11-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102208802B (en) | Power switching tube overcurrent detection and overcurrent protection circuit | |
| CN101882864B (en) | Electrifying startup circuit and electrifying startup method thereof | |
| KR101811741B1 (en) | An over-current protection circuit with foldback capability | |
| CN106300275A (en) | A kind of BUCK drive circuit, power supply chip and application thereof | |
| CN203481783U (en) | Short circuit and overcurrent protection circuit and mass production test equipment | |
| CN103490374B (en) | Mass production test device and short-circuit current foldback circuit thereof | |
| CN103001475B (en) | Short-circuit protecting circuit applied to synchronous boost type direct current-direct current (DC-DC) converter | |
| CN109245053A (en) | A kind of overload protecting circuit | |
| CN102288810A (en) | Voltage detection circuit | |
| CN105548672A (en) | Over-current detection circuit of power switch | |
| CN104300509A (en) | Under-voltage protection load latch circuit applicable to various lithium battery protection schemes | |
| CN202034765U (en) | Switch power source short circuit protection circuit | |
| CN106602532B (en) | Current-limiting circuit and its driving method, PMIC protection system and display apparatus protecting system | |
| EP2738768B1 (en) | Systems and methods for controlling power in semiconductor circuits | |
| CN108462152B (en) | Output protection circuit of double-phase direct-current brushless motor | |
| CN102983557B (en) | Battery protective circuit and charging power switch control signal producing circuit thereof | |
| CN104882856A (en) | High-precision over-current detection circuit | |
| CN207992860U (en) | Digital output circuit and industrial control equipment | |
| CN104022490A (en) | Lithium battery protection system and over-current direction circuit thereof | |
| CN102315633B (en) | Electrostatic protection circuit | |
| CN203423482U (en) | Power tube protection circuit and switch power supply circuit using the circuit | |
| CN103701444A (en) | Power driving circuit with hard real-time overcurrent protection function | |
| CN105743059A (en) | Output over-current protection circuit formed by reference source and resistor | |
| CN106505980A (en) | Voltage detection circuit and electrification reset circuit | |
| US9042066B2 (en) | Output stage with short-circuit protection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 201203. 602, 603, building 2, 112 Liang Xiu Road, Zhangjiang hi tech park, Shanghai Applicant after: Shanghai Mountain View Silicon Co., Ltd. Address before: 200135, A building, block 1518, Golden Eagle building, No. 403 Minsheng Road, Shanghai, Pudong New Area Applicant before: Shanghai Mvsilicon Integrated Circuit Co., Ltd. |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: SHANJING CIRCUIT TECH CO., LTD., SHANGHAI TO: SHANGHAI SHANJING INTEGRATED CIRCUITS CO., LTD. |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |