CN108258650A - A kind of current foldback circuit of low side driving - Google Patents
A kind of current foldback circuit of low side driving Download PDFInfo
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- CN108258650A CN108258650A CN201810097660.4A CN201810097660A CN108258650A CN 108258650 A CN108258650 A CN 108258650A CN 201810097660 A CN201810097660 A CN 201810097660A CN 108258650 A CN108258650 A CN 108258650A
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- low side
- module
- output terminal
- current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16504—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed
- G01R19/16519—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the components employed using FET's
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Abstract
The present invention relates to a kind of current foldback circuits of low side driving to include current sampling module；Low side drive module, including the control signal being connect with processor, the input terminal connected with load and the output terminal being grounded by current sampling module；Operational amplifying module, it is used to obtain the voltage value of current acquisition module conversion, and amplify；Single limit comparison module for judging whether amplified voltage value is more than short-circuit threshold value, and will determine that result exports；Switch off control circuit；For inputting corresponding control signal to the input terminal of low side drive module according to the judging result of single limit comparison module.The present invention passes through foregoing circuit; when load short circuits overcurrent; the controlling mechanism of low side drive module is PWN drivings or the constant output of high level driving; hardware can realize real-time guard; low side drive module is exported immediately and turns off and latches; low side drive module output is made to be constantly in closed state, preferably protects low side drive module and load.
Description
Technical field
The present invention relates to driving circuit field, more particularly to a kind of current foldback circuit of low side driving.
Background technology
At present, due to the abominable of its working environment and itself many powerful devices are configured in engineering machinery vehicle, because
Also the same very severe of electric circumstance of this engineering machinery vehicle, electric requirement are very high.And engineering machinery would generally use low side
Drive module goes to drive external high power load, such as relay, loudspeaker, light bulb etc..
In addition, particularly engineering machinery vehicle, often works in the rainy day.So due to the leakage of rainwater, wet weather,
Easily lead to load short circuits.Therefore, just seem increasingly important for the short-circuit protection of low side drive module.In general, low side is driven
The scheme of dynamic model block is controlled the open and close of low side drive module, the short-circuit protection of internal included current limit by MCU.When
It is limited when load current is larger, inside drive module and turns off output.When the shutdown back loading electric current decline of low side drive module, make
It obtains drive module and opens output again.It eventually leads to when load short circuits, low side drive module is exporting always beats Push And Release
The concussion state closed.This, which not only results in the low long-term overcurrent work of side drive module, reduces its service life, can also influence load and use
Service life.
Invention content
In order to solve the above-mentioned technical problem the present invention, provides a kind of current foldback circuit of low side driving.
A kind of current foldback circuit of low side driving, including
Current sampling module, for acquiring the current value in current loop and being converted into voltage value；
Low side drive module, including the control signal being connect with processor, the input terminal connected with load and by described
The output terminal of current sampling module ground connection；
Operational amplifying module for obtaining the voltage value of the current acquisition module conversion, and is amplified；
Single limit comparison module for judging whether amplified voltage value is more than short-circuit threshold value, and will determine that result exports；And
Switch off control circuit, for the input terminal according to single judging result for limiting comparison module to the low side drive module
Input corresponding control signal.
Further, it is described to switch off control circuit including sluggish comparison module and the first metal-oxide-semiconductor, the sluggish relatively mould
Block includes the negative input end being connect with single limit comparison module, connects positive input terminal and the output in the first specific voltage source
End, the grid of first metal-oxide-semiconductor connect the output terminal of the hysteresis comparator, and source electrode ground connection, drain Opposite direction connection the one or two
The control signal of the low side drive module is connected after pole pipe, while drain electrode is also connected with power supply.
Further, the sluggish comparison module includes first comparator, and the positive input terminal of the first comparator passes through
First bleeder circuit connects the first specific voltage source, and negative input end connects single limit by the second bleeder circuit and compares mould
The output terminal of block, is connected with first resistor between output terminal and the positive input terminal, the output terminal of the first comparator also on
Draw power supply.
Further, single limit comparison module includes the second comparator and the second metal-oxide-semiconductor；Second comparator
Output terminal connects the grid of second metal-oxide-semiconductor, and negative input end connects the second specific voltage source, and positive input terminal passes through second resistance
The output terminal of the operational amplifying module is connected, is switched off control circuit described in the drain electrode connection of second metal-oxide-semiconductor, source electrode connects
Ground.
Further, the operational amplifying module includes amplifier circuit and amplification follows circuit, and the amplification follows
Circuit carries out active power filtering to the signal that the amplifier circuit exports.
Further, the amplifier circuit includes the first amplifier, and first amplifier passes through divider resistance and institute
State the positive input terminal of current sampling module connection, the negative input end of ground connection and the output for circuit being followed to connect with the amplification
End；3rd resistor is connected between the input terminal and output terminal.
Further, the positive input terminal of the amplifier circuit and negative input end are steady by the first voltage-stabiliser tube and second respectively
Pressure pipe carries out voltage stabilizing.
Further, the amplification follows circuit to include the second amplifier, and the positive input terminal of second amplifier connects
The output terminal of first amplifier, negative input end connect the output terminal of first amplifier, first amplifier it is defeated
Outlet also singly limits comparison module by filter circuit connection.
Further, the current sampling module is the high-precision being serially connected between ground terminal and the low side drive module
Resistance.
Further, the circuit state feedback end for being arranged on the first metal-oxide-semiconductor drain electrode is further included, the circuit state is anti-
Feedback end is used to the short-circuit condition of circuit feeding back to peripheral control unit.
The current foldback circuit of the low side driving of the present invention, by foregoing circuit, when load short circuits overcurrent, no matter low side
The controlling mechanism of drive module is that PWN drivings or the constant output of high level driving, hardware can realize real-time guard, immediately
Low side drive module is exported and turns off and latches, low side drive module output is made to be constantly in closed state, is preferably protected low
Side drive module and load.
Description of the drawings
Fig. 1 is the architecture principle figure in the embodiment of the present invention 1.
Fig. 2 is the circuit diagram to switch off control circuit in the embodiment of the present invention 2.
Fig. 3 is the circuit diagram of single limit comparison module in the embodiment of the present invention 2.
Fig. 4 is the circuit diagram of the amplifier circuit in the embodiment of the present invention 3.
Fig. 5 follows the circuit diagram of circuit for the amplification in the embodiment of the present invention 3.
Specific embodiment
The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that advantages and features of the invention are more
It is easily readily appreciated by one skilled in the art, so as to make apparent define to protection scope of the present invention.
Embodiment 1：
A kind of current foldback circuit of low side driving, for the overcurrent protection to low side driving circuit, as shown in Figure 1, it is specific
Including low side drive module 10, current sampling module 20, operational amplifying module 30, single limit comparison module 40 and shutdown control electricity
Road 50.By current sampling module 20, operational amplifying module 30 and single limit comparison module 40 to the electric current in circuit loop into
Row acquisition and analysis, and according to analysis as a result, by switch off control circuit 50 come the conducting to low side drive module 10 or
Shutdown is controlled.Realize the effect of overcurrent protection.
Specifically, low side drive module 10 includes the control signal being connect with processor MCU, the input with load connection
End and the output terminal being grounded by the current sampling module 20.Processor MCU in the present embodiment is programmable control
System can export the signal of corresponding output signal or receiving circuit feedback into circuit.
In order to realize partial pressure and protection, there are two the resistance concatenated for setting between control output end IN and processor MCU.
Node between two resistance then connect switch off control circuit 50 output terminal relay_off.Preferably, output terminal
Inductance and the circuit with voltage stabilizing and filter function between DRAIN and load can be set, ensure the stabilization of electric current.Positive reason
Under condition, processor MCU sends a high level signal to low side drive module 10, turns it on, load current drives through too low side
It is grounded after dynamic model block 10, forms circuit.When needing shutdown, processor MCU outputs low level can turn off low side drive module 10,
Turn-off current circuit, makes load be stopped.And at control signal IN connection switch off control circuit 50 output terminal
Relay_off then can send low level signal to low side drive module 10 in time under current overload condition makes its chopping current
Circuit, protection load.
In terms of the function of each module, current sampling module 20 is used to acquire the current value in current loop and is converted into electricity
Pressure value, in the present embodiment, current sampling module 20 is the high-precision being serially connected between ground terminal and the low side drive module 10
Current data after the precision resister is serially connected in current loop, according to the pressure drop of its own, is converted into voltage data by resistance,
So as to the subsequent reading of circuit.
The voltage value that operational amplifying module 30 then converts current sampling module 20 is acquired and is amplified, and reaches it
To the voltage magnitude for meeting conventional analysis；Ensure the accuracy of detection.Amplified voltage value is output to single limit comparison module
After 40, single comparison module 40 that limits then starts to judge whether amplified voltage value is more than short-circuit threshold value, and will determine that result exports；
Switch off control circuit the 50 control signal IN according to single judging result for limiting comparison module 40 to low side drive module 10
Export corresponding control signal.When current overload, then low level is exported, turn off low side driving, otherwise do not export.Low side drives mould
Block 10 is controlled by processor MCU.In the present embodiment, switch off control circuit and stateful deposited function is set in 50, in electric current mistake
Low level signal will be exported after load always, when only receiving other trigger signals, just stops output, avoids current foldback circuit
In low side drive module 10 exporting always open with close concussion state.
Embodiment 2：
This implementation further optimizes on the basis of embodiment 1, as shown in Fig. 2, switching off control circuit 50 in the present embodiment
It is realized under the enable signal of sluggish comparison module 51 including 51 and first metal-oxide-semiconductor Q1 of sluggish comparison module, the first metal-oxide-semiconductor Q1
The conducting of itself is blocked.Sluggish comparison module 51 is used to export to the first metal-oxide-semiconductor Q1 after current overload information is received
Lasting corresponding enable signal.
Specifically, the output terminal of the sluggish comparison module 51 of grid connection of the first metal-oxide-semiconductor Q1, source electrode ground connection, drain electrode are reversed
The first diode D1 is connected, reconnects the control signal IN of low side drive module 10, while drain electrode is also connected with power supply.Normal
In the case of, the first metal-oxide-semiconductor Q1 is in the state blocked, and due to the effect of the first diode Z1, switching off control circuit 50 can't
Effective level signal is exported to the input terminal of low side drive module 10, when current overload, the first metal-oxide-semiconductor Q1 is then connected, defeated
Level is pulled low at outlet, so as to which the input terminal for making low side drive module 10 is pulled low, realizes circuit shutdown.
As shown in figure 3, in order to realize that state is deposited, sluggish comparison module 51 includes connecting with single limit comparison module 40 negative
Input terminal, connects the positive input terminal and output terminal in the first specific voltage source, and specific sluggishness comparison module 51 compares including first
The positive input terminal INPUT2+ of device U51, first comparator U51 connect the first specific voltage source by the first bleeder circuit 511, bear
Input terminal INPUT2- connects the output terminal of single limit comparison module 40 by the second bleeder circuit 512, output terminal OUTPUT2 with just
First resistor R1, the output terminal OUTPUT2 also pull-up power supplies of first comparator U51 are connected between input terminal INPUT2+.This reality
It applies in example, the first specific voltage source can be exported by processor MCU, and the voltage of output can be with by the first electric 511 tunnels of partial pressure
It realizes the adjusting of voltage value, regulates the voltage value in the first specific voltage source, ensure that first comparator U51's under normal condition is defeated
Outlet is low level, and when circuit overloads, single comparison module 40 that limits will make just defeated to negative input end INPUT2- input low levels
Enter to hold the current potential of INPUT2+ higher than negative input end INPUT2-, first comparator U51 output high level, while pass through first resistor
Under the feedback effect of R1, lasting high level output is realized, even if after circuit shutdown, single comparison module 40 that limits no longer exports low electricity
Flat, first comparator U51 can also continue output high level.When first comparator U51 is needed to stop output, it is only necessary to control
First specific voltage source exports a very brief low level signal, the preferably level signal of 50us.
During in order to ensure current overload, single comparison module 40 that limits can export low level, and the present embodiment provides following preferred
Scheme, single comparison module 40 that limits includes the second comparator U41 and the second metal-oxide-semiconductor Q2；The output terminal of second comparator U41
The grid of OUTPUT1 the second metal-oxide-semiconductors of connection Q2, negative input end INPUT1- the second specific voltages of connection source, positive input terminal INPUT1
+ by the output terminal of second resistance R2 connections operational amplifying module 30, wherein the second specific voltage can be according to actual use feelings
Condition is adjusted, and ensures that the negative input end INPUT1- current potentials of the second comparator U41 under normal circumstances are higher than positive input terminal INPUT1
+.And the potential value is then the threshold value for judging current overload.The present embodiment be then by two series connection ground resistance R41,
R42 and pull up 5V power supplys structure, it is only necessary to electricity can be thus achieved in the resistance value ratio for adjusting two series resistances R41, R42
Flow the height of overloading threshold.
The drain electrode connection of second metal-oxide-semiconductor Q2 switches off control circuit 50, source electrode ground connection.So as to be off the negative of control circuit 50
Input terminal potential can be set to low level, so as to fulfill switch off control circuit 50 negative input end control.
In order to processor MCU is enable to implement to be monitored circuit state, switching off control circuit 50 further includes and is arranged on
The circuit state feedback end FB of first metal-oxide-semiconductor Q1 drain electrodes, circuit state feedback FB end are used to feed back to the short-circuit condition of circuit
Processor MCU, processor MCU can be according to receiving the height of level so as to which whether Cutoff current overloads and protects the circuit to be
No intervention.
Preferably, in the present embodiment, the first bleeder circuit 511 is ground connection two resistance R511, R512 of series connection, wherein electricity
Hinder the positive input terminal INPUT2+ of the node connection first comparator U51 between R511 and resistance R512, the other end of resistance R511
Connect the first feature voltage source.
In addition, the second bleeder circuit includes resistance R521, R522, R523 of three series connection, wherein resistance R521 mono- is terminated
Enter 5V power supplys, the other end is grounded by the other end of resistance R522 connections resistance R523, resistance R523.First comparator U51's
One end of negative input end INPUT2- connection resistance R522, and the output terminal for singly limiting comparison module 40 connects the another of resistance R522
End.
Embodiment 3：
This implementation further optimizes on the basis of embodiment 1 or 2, as shown in figure 4, the operational amplifying module in the present embodiment
30 include amplifier circuit 31 and amplification follows circuit 32, amplification follow circuit 32 to the signal that amplifier circuit 31 exports into
Row active power filtering.
Wherein, amplifier circuit 31 is provided with divider resistance including the first amplifier U31, the first amplifier U31
The positive input terminal IN1+ that R311 is connect with current sampling module 20, the negative input end IN1- of ground connection and follow circuit 32 with amplification
The output terminal OUT1 of connection；3rd resistor R3 is connected between positive input terminal IN1+ and output terminal OUT1.
Component is led to respectively by excessive circuit damage, the positive input terminal and negative input end of amplifier circuit 31 in order to prevent
It crosses the first voltage-stabiliser tube Z1 and the second voltage-stabiliser tube Z2 and carries out voltage stabilizing.
In addition, as shown in figure 5, amplification follows circuit 32 to include the second amplifier U32, the positive input of the second amplifier U32
Output terminal OUT1, the output terminal OUT2 of negative input end IN- the second amplifiers of connection U32 of IN+ the first amplifiers of connection U31 is held,
The output terminal OUT2 of second amplifier U32 also singly limits comparison module 40 by filter circuit connection.
Embodiments of the present invention are explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned implementations
Mode, within the knowledge of a person skilled in the art, can also be under the premise of present inventive concept not be departed from
Various changes can be made.
Claims (10)
1. a kind of current foldback circuit of low side driving, which is characterized in that including
Current sampling module, for acquiring the current value in current loop and being converted into voltage value；
Low side drive module, including the control signal being connect with processor, the input terminal connected with load and by described
The output terminal of current sampling module ground connection；
Operational amplifying module for obtaining the voltage value of the current acquisition module conversion, and is amplified；
Single limit comparison module for judging whether amplified voltage value is more than short-circuit threshold value, and will determine that result exports；And
Switch off control circuit, for the input terminal according to single judging result for limiting comparison module to the low side drive module
Input corresponding control signal.
2. the current foldback circuit of low side driving according to claim 1, which is characterized in that the packet that switches off control circuit
Sluggish comparison module and the first metal-oxide-semiconductor are included, the sluggishness comparison module includes connecting with single limit comparison module negative defeated
Enter end, connect the positive input terminal and output terminal in the first specific voltage source, the grid connection sluggish ratio of first metal-oxide-semiconductor
Compared with the output terminal of device, source electrode is grounded, and the control input of the low side drive module is connected after the first diode of Opposite direction connection that drains
End, while drain electrode is also connected with power supply.
3. the current foldback circuit of low side driving according to claim 2, which is characterized in that the sluggishness comparison module
Including first comparator, the positive input terminal of the first comparator connects first specific voltage by the first bleeder circuit
Source, negative input end connect the output terminal of single limit comparison module, output terminal and the positive input terminal by the second bleeder circuit
Between be connected with first resistor, the output terminal also pull-up power supply of the first comparator.
4. the current foldback circuit of low side driving according to claim 1, which is characterized in that single limit comparison module packet
Include the second comparator and the second metal-oxide-semiconductor；The output terminal of second comparator connects the grid of second metal-oxide-semiconductor, bears defeated
Enter end the second specific voltage source of connection, positive input terminal connects the output terminal of the operational amplifying module by second resistance, described
Switch off control circuit described in the drain electrode connection of second metal-oxide-semiconductor, source electrode ground connection.
5. the current foldback circuit of low side driving according to claim 1, which is characterized in that the operational amplifying module packet
It includes amplifier circuit and amplification follows circuit, the signal that circuit is followed to export the amplifier circuit that amplifies has
Source filters.
6. the current foldback circuit of low side driving according to claim 5, which is characterized in that the amplifier circuit includes
First amplifier, the positive input terminal that first amplifier is connect by divider resistance with the current sampling module, ground connection
Negative input end and the output terminal for circuit being followed to connect with the amplification；Third electricity is connected between the input terminal and output terminal
Resistance.
7. the current foldback circuit of low side driving according to claim 6, which is characterized in that the amplifier circuit is just
Input terminal and negative input end carry out voltage stabilizing by the first voltage-stabiliser tube and the second voltage-stabiliser tube respectively.
8. the current foldback circuit of low side driving according to claim 6, which is characterized in that the amplification follows circuit packet
The second amplifier is included, the positive input terminal of second amplifier connects the output terminal of first amplifier, negative input end connection
The output terminal of second amplifier, the output terminal of second amplifier is also singly limited by filter circuit connection compares mould
Block.
9. the current foldback circuit of low side driving according to claim 1, which is characterized in that the current sampling module is
The precision resister being serially connected between ground terminal and the low side drive module.
10. the current foldback circuit of low side driving according to claim 2, which is characterized in that further include described in being arranged on
The circuit state feedback end of first metal-oxide-semiconductor drain electrode, the circuit state feedback end are used to feed back to the short-circuit condition of circuit outer
Portion's controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810097660.4A CN108258650B (en) | 2018-01-31 | 2018-01-31 | A kind of current foldback circuit of low side driving |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810097660.4A CN108258650B (en) | 2018-01-31 | 2018-01-31 | A kind of current foldback circuit of low side driving |
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| CN108258650A true CN108258650A (en) | 2018-07-06 |
| CN108258650B CN108258650B (en) | 2019-06-07 |
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| CN201810097660.4A Active CN108258650B (en) | 2018-01-31 | 2018-01-31 | A kind of current foldback circuit of low side driving |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110154941A (en) * | 2019-04-29 | 2019-08-23 | 惠州市德赛西威汽车电子股份有限公司 | A kind of band is accurately opened a way the low side driving circuit and its detection method of detection |
| CN110928391A (en) * | 2019-11-14 | 2020-03-27 | 西安海的电子科技有限公司 | Computer host monitoring method |
| CN111276935A (en) * | 2020-02-28 | 2020-06-12 | 联合汽车电子有限公司 | Overcurrent diagnosis processing circuit |
| CN112255937A (en) * | 2020-09-18 | 2021-01-22 | 惠州市德赛西威汽车电子股份有限公司 | Automobile combination instrument control circuit capable of detecting low-side load open circuit |
| CN113092836A (en) * | 2021-04-14 | 2021-07-09 | 山东英信计算机技术有限公司 | Circuit and method for realizing reliable protection of load circuit |
| CN114597863A (en) * | 2022-03-07 | 2022-06-07 | 潍柴动力股份有限公司 | Power supply protection circuit |
| CN114851798A (en) * | 2022-05-20 | 2022-08-05 | 中国第一汽车股份有限公司 | Gas storage valve drive circuit |
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| CN206340955U (en) * | 2016-12-30 | 2017-07-18 | 济南艾莫康电子科技有限公司 | A kind of self-diagnosable and the low side MOSFET drive control circuits quickly protected |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110154941A (en) * | 2019-04-29 | 2019-08-23 | 惠州市德赛西威汽车电子股份有限公司 | A kind of band is accurately opened a way the low side driving circuit and its detection method of detection |
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| CN110928391A (en) * | 2019-11-14 | 2020-03-27 | 西安海的电子科技有限公司 | Computer host monitoring method |
| CN111276935A (en) * | 2020-02-28 | 2020-06-12 | 联合汽车电子有限公司 | Overcurrent diagnosis processing circuit |
| CN112255937A (en) * | 2020-09-18 | 2021-01-22 | 惠州市德赛西威汽车电子股份有限公司 | Automobile combination instrument control circuit capable of detecting low-side load open circuit |
| CN112255937B (en) * | 2020-09-18 | 2024-03-19 | 惠州市德赛西威汽车电子股份有限公司 | Automobile combination instrument control circuit capable of detecting low-side load open circuit |
| CN113092836A (en) * | 2021-04-14 | 2021-07-09 | 山东英信计算机技术有限公司 | Circuit and method for realizing reliable protection of load circuit |
| CN114597863A (en) * | 2022-03-07 | 2022-06-07 | 潍柴动力股份有限公司 | Power supply protection circuit |
| CN114597863B (en) * | 2022-03-07 | 2024-02-20 | 潍柴动力股份有限公司 | Power protection circuit |
| CN114851798A (en) * | 2022-05-20 | 2022-08-05 | 中国第一汽车股份有限公司 | Gas storage valve drive circuit |
| CN114851798B (en) * | 2022-05-20 | 2024-09-17 | 中国第一汽车股份有限公司 | Gas storage valve driving circuit |
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| Publication number | Publication date |
|---|---|
| CN108258650B (en) | 2019-06-07 |
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