CN108879593A - A kind of list comparator overcurrent protection driving circuit and generator voltage controller - Google Patents
A kind of list comparator overcurrent protection driving circuit and generator voltage controller Download PDFInfo
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- CN108879593A CN108879593A CN201810881341.2A CN201810881341A CN108879593A CN 108879593 A CN108879593 A CN 108879593A CN 201810881341 A CN201810881341 A CN 201810881341A CN 108879593 A CN108879593 A CN 108879593A
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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
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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
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/06—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
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- Power Engineering (AREA)
- Protection Of Static Devices (AREA)
Abstract
A kind of list comparator overcurrent protection driving circuit,Including the first comparing unit (101),Power cell (102),Energy-storage units (103),Timing circuit (104),Clamp circuit (105),The non-inverting input terminal of first comparing unit receives reference voltage Vref,First comparing unit (A1) output end connects energy-storage units input terminal,The power cathode end of energy-storage units is grounded,Energy-storage units output end connects timing circuit input terminal,The power cathode end of timing circuit is grounded,The power cathode end of timing circuit is grounded,Timing circuit output end connects the inverting input terminal of clamper circuit output end and the first comparing unit simultaneously,The input terminal of the output end connection power cell of first comparing unit,The power cathode end of power cell is grounded,The input terminal of the output end connection clamp circuit of power cell is used to be the first comparing unit feedback power device saturation voltage drop signal,The output end of power cell is also used to control the power cathode of external loading.
Description
Technical field
The invention belongs to technical field of electromechanical control, and in particular to a kind of list comparator overcurrent protection driving circuit and power generation
Machine voltage regulator.
Background technique
Electromechanical equipment needs power control circuit, such as operation, the control of generator excitation winding of various motor devices.?
When control circuit is run, usually because overload, over-current phenomenon avoidance occur for power device, makes power tube overheat or even breakdown, electric leakage, burns
It the damage such as ruins, or even serious short circuit accident occurs.For generator excitation, excitation winding open circuit, overcurrent etc. can all cause
Power tube overload needs to design the driving circuit with overcurrent protection function to prevent its damage.
However, there are drawbacks for the circuit of existing overcurrent protection function, it is mainly manifested in：
1, the overcurrent protection driving circuit of main line current sample method：The small resistance value high-power resistance of series connection at the high current of main line
Carry out current sampling, this method is more common, but the concatenated high-power sampled resistance consumption electrical power of this method institute and
It largely generates heat, occupies larger board area, increases material and process costs.
2, the overcurrent protection driving circuit of direct sampled power pipe saturation voltage drop：Such circuit eliminates greatly than the first
Power sample resistance, but this circuit needs handle the saturation voltage drop signal sampled, mostly use more complicated place
Circuit is managed, including is handled with comparator, amplifier, analog to digital conversion circuit, cpu etc., it is first such to protect circuit signal stream
Journey link is excessively complicated, may between hardware protection and processing software there are concatenating logic, one go wrong just make protection by
To influence or failure, second circuit is complicated, occupancy board area is larger, increases probability of malfunction, increases cost.
3, the overcurrent protection driving circuit of special chip：Such circuit cost height, price are costly.
Therefore need to design the overcurrent protection driving circuit that circuit is relatively simple, safe and reliable.
Summary of the invention
It is an object of the present invention to provide overcurrent protection function and directly using simple single comparator circuit design
Sampled power pipe saturation voltage drop carries out the power driving circuit of overcurrent protection, for load devices such as driving motors, especially uses
In the overcurrent protective generator voltage controller of the relatively simple direct sampled power pipe saturation voltage drop of construction circuit.
According to the present invention in a first aspect, providing a kind of single comparator overcurrent protection driving circuit, special character exists
In include the first comparing unit, power cell, energy-storage units, timing circuit, clamp circuit,
First comparing unit has non-inverting input terminal, inverting input terminal and output end,
The power cell has input, output end and power cathode end,
The energy-storage units have input, output end and power cathode end,
The timing circuit has input, output end and power cathode end,
The clamp circuit has input terminal and output end,
Wherein,
The non-inverting input terminal of first comparing unit with the reference voltage circuit of peripheral hardware for being connected, for receiving one
The output end of reference voltage, first comparing unit connects the input terminal of the energy-storage units, the power supply of the energy-storage units
Negative pole end ground connection, the output end of the energy-storage units connect the input terminal of the timing circuit, and the power supply of the timing circuit is negative
Extreme ground connection, the power cathode end ground connection of the timing circuit, the output end of the timing circuit connect the clamper electricity simultaneously
The inverting input terminal of the output end on road and first comparing unit,
The output end of first comparing unit connects the input terminal of the power cell, and the power supply of the power cell is negative
Extreme ground connection, the input terminal that the output end of the power cell connects the clamp circuit are used to be that first comparing unit is anti-
Power device saturation voltage drop signal is presented, the output end of the power cell is also used to control the power cathode of external loading,
When the power cell normally, the saturation voltage drop of power device drags down described first by clamper circuit
Comparing unit anti-phase input terminal potential makes the anti-phase input terminal potential lower than the received reference voltage electricity of the non-inverting input terminal
Position, the first comparing unit output high potential makes the power device on state is stablized, when the power device is sent out
When raw overcurrent, saturation voltage drop is more than setting value, and the anti-phase input terminal potential of first comparing unit is made by clamper circuit
Higher than the reference voltage potential of non-inverting input terminal, the first comparing unit overturning keeps the power device vertical for output low potential
I.e. cut-off is protected, and energy-storage units maintain the guard mode of power device cut-off by delay circuit, with energy-storage units
Energy storage is released process progress, relatively more single when energy storage is released to comparing unit anti-phase input terminal potential lower than the reference voltage
Overturning is output high potential to member again, and the power cell is connected again and makes comparing unit anti-phase input by clamp circuit
Terminal potential is lower than homophase input terminal potential, restores normally if overcurrent releases, if overcurrent continues to reenter protection shape
State.
Second aspect according to the present invention provides a kind of generator voltage controller, is characterized in that including first
Single comparator overcurrent protection driving circuit described in aspect.
Preferably, a kind of generator voltage controller, be characterized in that including sampling unit, first threshold unit,
Second threshold unit and single comparator overcurrent protection driving circuit, the sampling unit connection voltage regulator power supply is just
Cathode, sampling unit output end connects the inverting input terminal of first comparing unit by the second threshold unit, described
First threshold unit connects power positive cathode, and first threshold unit output end connects the first comparing unit non-inverting input terminal,
The first threshold unit is for generating the reference voltage.
Further, a kind of generator voltage controller is characterized in that the second threshold unit is pressure stabilizing two
Pole pipe.
Preferably, a kind of generator voltage controller, be characterized in that including sampling unit, first threshold unit,
Second threshold unit and single comparator overcurrent protection driving circuit, the sampling unit connection voltage regulator power supply is just
Cathode, sampling unit output end connect the second threshold unit input terminal, and the second threshold unit ground terminal ground connection is described
Second threshold unit output end connects the non-inverting input terminal of first comparing unit or connects the defeated of first comparing unit
Outlet, the first threshold unit connect power positive cathode, and it is same that first threshold unit output end connects first comparing unit
Phase input terminal, the first threshold unit are that three end of controlled type is steady for generating the reference voltage, the second threshold unit
Press integrated circuit.
Preferably, a kind of generator voltage controller, be characterized in that including sampling unit, first threshold unit,
Second comparing unit and single comparator overcurrent protection driving circuit, the first threshold unit connect power positive cathode,
First threshold unit output end connects the first comparing unit non-inverting input terminal, the sampling unit connection voltage regulator electricity
Source positive and negative anodes, sampling unit output end connect the second comparing unit inverting input terminal, and second comparing unit is the same as mutually defeated
Entering end and connects the first threshold unit output end, the first threshold unit is for generating the reference voltage, and described second
Comparing unit output end connects the output end of first comparing unit.
Preferably, a kind of generator voltage controller, be characterized in that including sampling unit, first threshold unit,
Third threshold cell, the second comparing unit and single comparator overcurrent protection driving circuit, the first threshold unit connect
Power positive cathode is connect, first threshold unit output end connects the first comparing unit non-inverting input terminal, the third threshold value list
Member connection power positive cathode, third threshold cell output end connect the second comparing unit non-inverting input terminal, and the sampling is single
Member connection power positive cathode, sampling unit output end connect the second comparing unit inverting input terminal, the first threshold list
For member for generating the reference voltage Vref, the second comparing unit output end connects the same mutually defeated of first comparing unit
Enter end.
The invention has the advantages that the overcurrent protection driving circuit of directly sampled power pipe saturation voltage drop：Such electricity
Road eliminates high-power sampled resistance than the first, and comparison amplification, the positive feedback of overcurrent saturation voltage drop are carried out using single comparator
The cutting of overturning and grid voltage driving, and the protection circuit handled by amplifier, analog to digital conversion circuit, cpu etc. compare, the present invention
Protect circuit signal process link simple, there is no the concatenating logics between software and hardware, and protection act is more safe and reliable, occupy
Board area is smaller, reduces cost.It when for the technical program being carried out integrated, and is come in fact with smaller chip area
Existing overcurrent protection function.
Detailed description of the invention
Fig. 1 is a kind of single comparator overcurrent protection driving circuit structure schematic diagram that embodiment of the present invention provides,
Fig. 2 be embodiment of the present invention provide the first include single comparator overcurrent protection driving circuit power generation it is electromechanical
Controller structure schematic diagram is pressed,
Fig. 3 is that second of power generation including single comparator overcurrent protection driving circuit that embodiment of the present invention provides is electromechanical
Controller structure schematic diagram is pressed,
Fig. 4 be embodiment of the present invention provide the third include single comparator overcurrent protection driving circuit power generation it is electromechanical
Controller structure schematic diagram is pressed,
Fig. 5 is that the 4th kind of power generation including single comparator overcurrent protection driving circuit that embodiment of the present invention provides is electromechanical
Controller structure schematic diagram is pressed,
Fig. 6 is that the 5th kind of power generation including single comparator overcurrent protection driving circuit that embodiment of the present invention provides is electromechanical
Press controller structure schematic diagram.
Specific embodiment
It is an object of the present invention to provide overcurrent protection function and directly using simple single comparator circuit design
Sampled power pipe saturation voltage drop carries out the power driving circuit of overcurrent protection, for load devices such as driving motors, especially uses
In the overcurrent protective generator voltage controller of the relatively simple direct sampled power pipe saturation voltage drop of construction circuit, to adapt to
Rigors of the generator voltage controller to reliability and small size.
In a first aspect, providing a kind of single comparator overcurrent protection driving circuit, as described in Example 1.
Embodiment 1
A kind of list comparator overcurrent protection driving circuit, as shown in Figure 1, the circuit includes the first comparing unit 101, power
Unit 102, energy-storage units 103, timing circuit 104, clamp circuit 105,
First comparing unit has non-inverting input terminal, inverting input terminal and output end,
Power cell has input, output end and power cathode end,
Energy-storage units have input, output end and power cathode end,
Timing circuit has input, output end and power cathode end,
Clamp circuit has input terminal and output end,
Wherein,
The non-inverting input terminal of first comparing unit (comparator A1) is used for for being connected with the reference voltage circuit of peripheral hardware
Receive a reference voltage Vref, the input terminal of the output end connection energy-storage units of the first comparing unit (comparator) A1, energy storage list
The power cathode end of member is grounded (i.e. power cathode Gnd), and the input terminal of the output end connection timing circuit of energy-storage units is delayed back
The power cathode end on road is grounded, and the power cathode end ground connection of timing circuit, the output end of timing circuit connects clamp circuit simultaneously
The inverting input terminal of output end (the diode D2 positive terminal) and the first comparing unit of (diode D2),
The input terminal of the output end connection power cell of first comparing unit, the power cathode end ground connection of power cell, function
The input terminal (diode D2 negative pole end) of the output end connection clamp circuit of rate unit is used to be the first comparing unit feedback power
Device saturation voltage drop signal, the output end (Vout) of power cell are also used to control the power cathode of external loading.
In Fig. 1, energy-storage units 1003 include diode D2 and capacitor C1, and diode D2 anode is inputted as energy-storage units
End, D2 cathode connect the one end capacitor C1 as energy-storage units output end, and the capacitor C1 other end is grounded as power cathode end.Delay
Circuit 104 includes the resistance R1 and R2 being connected in series, output end of the connecting node as timing circuit, the resistance R1 other end
It is connected as timing circuit input terminal with 103 output end of energy-storage units, the resistance R2 other end is as timing circuit power cathode end
Ground connection.Certainly, voltage comparator A1 also needs to connect positive pole (B+) and ground (Gnd).
The course of work is：
When power tube (Fig. 1 is by taking field-effect tube as an example) normally of power cell, saturation voltage drop is returned by clamper
Road diode D1 drags down the first comparing unit anti-phase input terminal potential, keeps anti-phase input terminal potential received lower than non-inverting input terminal
Reference voltage potential Vref, the first comparing unit export high potential, and power tube grid obtains driving voltage, is in power device
Stablize on state, when overcurrent occurs for power tube, saturation voltage drop Uds will be more than setting value, make the by clamper circuit
The anti-phase input terminal potential of one comparing unit is higher than the reference voltage potential of non-inverting input terminal, i.e.,：Uds+UD1 > Vref, in formula
UD1 is diode D1 forward conduction voltage drop, and the first comparing unit overturning at this time is output low potential, and power tube grid voltage is pulled to low
Current potential ends power device immediately and is protected.At this point, power tube drain electrode has external load to draw high to positive pole current potential,
Make the reverse-biased cut-off of diode D1, charge is stored on capacitor C1, capacitor C1 passes through resistance R1, R2 and comparator A1 anti-phase input
Circuit discharges in holding, and theoretically comparator input terminal internal resistance is infinitely great, but actually still has electric current to be consumed, certainly
For discharge path mainly also on resistance R1, R2, energy-storage units maintain the guard mode of power device cut-off by delay circuit, with
The energy storage of energy-storage units release process progress, when energy storage is released to comparing unit anti-phase input terminal potential lower than reference voltage
When Vref, comparing unit is overturn again to export high potential, and power cell is connected again and makes comparison list by clamp circuit
First anti-phase input terminal potential is lower than homophase input terminal potential, restores normally if overcurrent releases, if overcurrent continues again
Into guard mode.
As can be seen that this circuit structure is fairly simple, and when overcurrent protection occurs, since there are such mistakes
Journey：Comparator A1 anti-phase input terminal potential ↑ → comparator output terminal current potential ↓ → power tube grid potential ↓ → power tube drain electrode electricity
Position ↑ → by D1 make comparator A1 anti-phase input terminal potential ↑, this is an a strong positive feedback process, and city's field circuit is sharply overturn
It for the state of power tube cut-off, is swift in motion, protects reliable and stable.
Second aspect provides a kind of generator voltage controller, is to include single comparator mistake described in first aspect
Stream protection driving circuit.
Embodiment 2
A kind of generator voltage controller, as shown in Fig. 2, including sampling unit 107, first threshold unit 106, the second threshold
Value cell 108 and foregoing single comparator overcurrent protection driving circuit, the sampling unit for having resistance R7, R8 in series connect
Connect voltage regulator power positive cathode, the ratio of zener diode D4 connection first that sampling unit output end passes through second threshold unit
Compared with the inverting input terminal of unit, it is positive and negative that power supply is connected by the resistance R5 first threshold unit in series with zener diode D3
Pole, first threshold unit output end connect the first comparing unit non-inverting input terminal, and first threshold unit is for generating reference voltage
Vref。
It should be noted that increasing resistance R6 in the present embodiment circuit in comparator A1 inverting input terminal, doing so
Purpose be in order to separately input " over-voltage signal " from sampling unit and voltage-stabiliser tube D4 in the inverting input terminal of comparator A1, with
Comparator is set to be controlled by generator output voltage again, to simplify voltage regulator structure.
When generator output voltage is lower than setting value, diode D4 cut-off, single comparator overcurrent protection driving circuit is with before
The excited state of normally can be entered by stating embodiment 1 equally, occur that overcurrent protection can be implemented when overcurrent.
When generator output voltage is higher than setting value, sampling unit makes to compare by voltage-stabiliser tube D4 output " over-voltage signal "
The voltage signal for being higher than non-inverting input terminal reference voltage Vref, comparator overturning are obtained compared with device A1 inverting input terminal, power tube is cut
Only, generator exits excitation, has hereafter continued the discharge process of the capacitor C1 during aforementioned " overcurrent protection ", had discharged herein
Cheng Zhong, power tube make cut-off, when electric discharge terminates, and generator output voltage has been fallen back to lower than setting value, just open
Begin the state for enabling comparator A1 be flipped back to output high level, and power tube restores excitation again, it is seen then that such voltage regulator
Excitation frequency is influenced by the time constant of capacitor C1 and timing circuit, and the excitation frequency of such generator can be made
About, the excessively high too low phenomenon of excitation frequency will not occur as conventional voltage adjuster, this is also that bring of the present invention is excellent
Excitation technology effect.
Embodiment 3
A kind of generator voltage controller, as shown in figure 3, including sampling unit 107, first threshold unit 106, the second threshold
Value cell N1 and foregoing single comparator overcurrent protection driving circuit, it is positive and negative that sampling unit connects voltage regulator power supply
Pole, sampling unit output end connect second threshold unit N1 input terminal, second threshold unit be it is internal containing reference voltage by
Control formula circuit of three-terminal voltage-stabilizing integrated, such as AZ431, second threshold unit ground terminal ground connection, the connection of second threshold unit output end
The non-inverting input terminal of first comparing unit, first threshold unit connect power positive cathode, first threshold unit output end connection the
One comparing unit non-inverting input terminal, first threshold unit is for generating reference voltage Vref.
When generator output voltage is lower than setting value, sampling unit output signal voltage is inputted lower than second threshold unit
End activation threshold value voltage (it is 2.45V) such as by taking AZ431 as an example, circuit is in high resistant open circuit state in second threshold unit N1 output end,
It, should " single comparator overcurrent guarantor on being that " single comparator overcurrent protection driving circuit " that core is constituted does not influence by comparator A1
Shield driving circuit " can drive excitation winding to obtain normal exciting current.In power tube normally, comparator A1 is anti-
The current potential UA1 of phase input terminal is anti-=Uds+UD1, Uds is power tube saturation voltage drop (generally in 0.8V or less), UD1 bis- in formula
Pole pipe D1 forward conduction voltage drop (generally in 0.6V or less), the current potential UA1 of comparator A1 inverting input terminal instead generally 1.5V with
Under (not being only to be illustrated to the restriction of the voltage with this).
It is more than the setting value moment in generator output voltage, sampling unit signal triggers second threshold unit N1 conducting, leads
Generally in 0.8V or less, (N1 conducting electric current carrys out self-resistance R5 to N1 anode voltage UN1 after logical, and electric current is led generally in milliampere grade
Logical pressure drop is very low), i.e.,：UN1 < UA1 is anti-, so that comparator A1 overturning is low level output, drags down power tube grid potential, cuts
Disconnected excitation, until generator output voltage is lower than setting value and at the end of capacitor C1 discharges, comparator A1 is overturn again as height
Level output restores excitation.
Embodiment 4
As shown in figure 4, a kind of generator voltage controller, including sampling unit 107, first threshold unit 106, the second threshold
Value cell N1 and foregoing single comparator overcurrent protection driving circuit, it is positive and negative that sampling unit connects voltage regulator power supply
Pole, sampling unit output end connect second threshold unit N1 input terminal, second threshold unit be it is internal containing reference voltage by
Control formula circuit of three-terminal voltage-stabilizing integrated, such as AZ431, second threshold unit ground terminal ground connection, the connection of second threshold unit output end
The output end of first comparing unit, first threshold unit connect power positive cathode, the first ratio of first threshold unit output end connection
Compared with unit non-inverting input terminal, first threshold unit is for generating reference voltage Vref.
When generator output voltage is lower than setting value, sampling unit output signal voltage is inputted lower than second threshold unit
End activation threshold value voltage (it is 2.45V) such as by taking AZ431 as an example, circuit is in high resistant open circuit state in second threshold unit N1 output end,
It, should " single comparator overcurrent guarantor on being that " single comparator overcurrent protection driving circuit " that core is constituted does not influence by comparator A1
Shield driving circuit " can drive excitation winding to obtain normal exciting current.
It is more than the setting value moment in generator output voltage, sampling unit signal triggers second threshold unit N1 conducting, draws
Low-power tube grid current potential cuts off excitation, at the end of generator output voltage is lower than setting value and capacitor C1 electric discharge, than
It is overturn again compared with device A1 and restores excitation for high level output.
Embodiment 5
A kind of generator voltage controller, as shown in figure 5, including sampling unit 107, the ratio of first threshold unit 106, second
Compared with unit A2 and foregoing single comparator overcurrent protection driving circuit, first threshold unit connects power positive cathode, and first
Threshold cell output end connects the non-inverting input terminal of the first comparing unit A1, and it is positive and negative that sampling unit connects voltage regulator power supply
Pole, sampling unit output end connect the second comparing unit A2 inverting input terminal, the second comparing unit non-inverting input terminal connection first
Threshold cell output end, first threshold unit is for generating reference voltage Vref, the first ratio of the second comparing unit output end connection
Compared with the output end of unit.
When generator output voltage is lower than setting value, sampling unit output signal voltage is exported lower than first threshold unit
Signal voltage Vref, comparator A2 export high potential (in output end circuit in high resistant open a way state), to have comparator A1 be core
" the single comparator overcurrent protection driving circuit " constituted does not influence, and being somebody's turn to do " single comparator overcurrent protection driving circuit " can drive
Excitation winding obtains normal exciting current.
It is more than the setting value moment in generator output voltage, the two the second comparing unit A2 of sampling unit signal triggering is turned over
Turn, directly drag down 102 grid potential of power tube, cut off excitation, until generator output voltage is lower than setting value and capacitor C1
At the end of electric discharge, comparator A1 is overturn again restores excitation for high level output.
Embodiment 6
A kind of generator voltage controller, as shown in fig. 6, including sampling unit 107, first threshold unit 106, third threshold
Value cell 110, the second comparing unit A2 and foregoing single comparator overcurrent protection driving circuit, the connection of first threshold unit
Power positive cathode, first threshold unit output end connect the first comparing unit A1 non-inverting input terminal, third threshold cell connection electricity
Source positive and negative anodes, third threshold cell output end connect the second comparing unit A2 non-inverting input terminal, and it is positive and negative that sampling unit connects power supply
Pole, sampling unit output end connect the second comparing unit inverting input terminal, and first threshold unit is used to generate reference voltage Vref,
Second comparing unit output end connects the non-inverting input terminal of the first comparing unit.
When generator output voltage is lower than setting value, sampling unit output signal voltage is exported lower than third threshold cell
End signal voltage, circuit is opened a way state in high resistant in the second comparing unit comparator A2 output end, to being core structure by comparator A1
At " single comparator overcurrent protection driving circuit " do not influence, should " single comparator overcurrent protection driving circuit " can drive and encourage
Magnetic winding obtains normal exciting current.
In power tube normally, as before, the current potential UA1=Uds+UD1 of comparator A1 inverting input terminal, this value are general
1.5V or less (not being only to be illustrated to the restriction of the voltage with this).
It is more than the setting value moment in generator output voltage, sampling unit output signal triggers the second comparing unit A2 and turns over
Turn, drag down comparator A1 non-inverting input terminal voltage (generally below 0.2V), so that comparator A1 overturning is low level output, drags down
Power tube grid potential cuts off excitation, at the end of generator output voltage is lower than setting value and capacitor C1 electric discharge, compares
Device A1 is overturn again restores excitation for high level output.
Pass through the description of above-mentioned several embodiments, it can be deduced that：1. the single comparator of the clothes made of brocade can be constituted with overcurrent
The driving circuit of defencive function is used primarily in the electronic products such as driving motor coil load, resistive load, and is with load
The controlled form of cold end (i.e. cathode is controlled) is controlled, and can is DC driven, can is pulsed drive, for pulsed drive
When, the pulse period should be less than the capacitor C1 effective discharge time for being somebody's turn to do " single comparator current foldback circuit "；The driving circuit is steady
It is fixed reliable, route is simple, application range is wider.2. being adjusted using the generator voltage for being somebody's turn to do " single comparator current foldback circuit "
Device equally has many advantages, such as that circuit is simple, protection act is timely, highly reliable, excitation frequency is by restriction.
The invention has the advantages that the overcurrent protection driving circuit of directly sampled power pipe saturation voltage drop：Such electricity
Road eliminates high-power sampled resistance than the first, and comparison amplification, the positive feedback of overcurrent saturation voltage drop are carried out using single comparator
The cutting of overturning and grid voltage driving, and the protection circuit handled by amplifier, analog to digital conversion circuit, cpu etc. compare, the present invention
Protect circuit signal process link simple, there is no the concatenating logics between software and hardware, and protection act is more safe and reliable, occupy
Board area is smaller, reduces cost.It when for the technical program being carried out integrated, and is come in fact with smaller chip area
Existing overcurrent protection function.
Claims (7)
1. a kind of list comparator overcurrent protection driving circuit, it is characterised in that including the first comparing unit, power cell, energy storage list
Member, timing circuit, clamp circuit,
First comparing unit has non-inverting input terminal, inverting input terminal and output end,
The power cell has input, output end and power cathode end,
The energy-storage units have input, output end and power cathode end,
The timing circuit has input, output end and power cathode end,
The clamp circuit has input terminal and output end,
Wherein,
The non-inverting input terminal of first comparing unit with the reference voltage circuit of peripheral hardware for being connected, for receiving a benchmark
The output end of voltage, first comparing unit connects the input terminal of the energy-storage units, the power cathode of the energy-storage units
End ground connection, the output end of the energy-storage units connect the input terminal of the timing circuit, the power cathode end of the timing circuit
Ground connection, the power cathode end ground connection of the timing circuit, the output end of the timing circuit connect the clamp circuit simultaneously
The inverting input terminal of output end and first comparing unit,
The output end of first comparing unit connects the input terminal of the power cell, the power cathode end of the power cell
Ground connection, the input terminal that the output end of the power cell connects the clamp circuit are used to feed back function for first comparing unit
Rate device saturation voltage drop signal, the output end of the power cell are also used to control the power cathode of external loading,
When the power cell normally, the saturation voltage drop of power device drags down described first by clamper circuit and compares
Unit anti-phase input terminal potential makes the anti-phase input terminal potential be lower than the received reference voltage potential of the non-inverting input terminal,
The first comparing unit output high potential makes the power device on state is stablized, when the power device occurred
When stream, saturation voltage drop is more than setting value, is higher than the anti-phase input terminal potential of first comparing unit by clamper circuit
The reference voltage potential of non-inverting input terminal, the first comparing unit overturning cut the power device immediately for output low potential
It is only protected, energy-storage units maintain the guard mode of power device cut-off by delay circuit, with the energy storage of energy-storage units
Process of releasing carries out, and when energy storage is released to comparing unit anti-phase input terminal potential lower than the reference voltage, comparing unit is again
Secondary overturning is output high potential, and the power cell is connected again and keeps comparing unit inverting input terminal electric by clamp circuit
Position is lower than homophase input terminal potential, restores normally if overcurrent releases, if overcurrent continues to reenter guard mode.
2. a kind of generator voltage controller, it is characterised in that driven including single comparator overcurrent protection described in claim 1
Circuit.
3. generator voltage controller as claimed in claim 2, it is characterised in that including sampling unit, first threshold unit,
Second threshold unit and single comparator overcurrent protection driving circuit as described in claim 1, the sampling unit connect voltage
Adjuster power positive cathode, sampling unit output end connect the reverse phase of first comparing unit by the second threshold unit
Input terminal, the first threshold unit connect power positive cathode, and first threshold unit output end connects first comparing unit
Non-inverting input terminal, the first threshold unit is for generating the reference voltage.
4. generator voltage controller as claimed in claim 3, it is characterised in that the second threshold unit is two pole of pressure stabilizing
Pipe.
5. generator voltage controller as claimed in claim 2, it is characterised in that including sampling unit, first threshold unit,
Second threshold unit and single comparator overcurrent protection driving circuit as described in claim 1, the sampling unit connect voltage
Adjuster power positive cathode, sampling unit output end connect the second threshold unit input terminal, and the second threshold unit connects
Ground terminal ground connection, the second threshold unit output end connect the non-inverting input terminal or connection described first of first comparing unit
The output end of comparing unit, the first threshold unit connect power positive cathode, first threshold unit output end connection described the
One comparing unit non-inverting input terminal, for generating the reference voltage, the second threshold unit is the first threshold unit
Controlled type circuit of three-terminal voltage-stabilizing integrated.
6. generator voltage controller as claimed in claim 2, it is characterised in that including sampling unit, first threshold unit,
Second comparing unit and single comparator overcurrent protection driving circuit as described in claim 1, the first threshold unit connection
Power positive cathode, first threshold unit output end connect the first comparing unit non-inverting input terminal, the sampling unit connection
Voltage regulator power positive cathode, sampling unit output end connect the second comparing unit inverting input terminal, second ratio
The first threshold unit output end is connected compared with unit non-inverting input terminal, the first threshold unit is for generating the benchmark electricity
Pressure, the second comparing unit output end connect the output end of first comparing unit.
7. generator voltage controller as claimed in claim 2, it is characterised in that including sampling unit, first threshold unit,
Third threshold cell, the second comparing unit and single comparator overcurrent protection driving circuit, the first threshold unit connect
Power positive cathode is connect, first threshold unit output end connects the first comparing unit non-inverting input terminal, the third threshold value list
Member connection power positive cathode, third threshold cell output end connect the second comparing unit non-inverting input terminal, and the sampling is single
Member connection power positive cathode, sampling unit output end connect the second comparing unit inverting input terminal, the first threshold list
For member for generating the reference voltage Vref, the second comparing unit output end connects the same mutually defeated of first comparing unit
Enter end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810881341.2A CN108879593A (en) | 2018-08-05 | 2018-08-05 | A kind of list comparator overcurrent protection driving circuit and generator voltage controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810881341.2A CN108879593A (en) | 2018-08-05 | 2018-08-05 | A kind of list comparator overcurrent protection driving circuit and generator voltage controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108879593A true CN108879593A (en) | 2018-11-23 |
Family
ID=64307950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810881341.2A Withdrawn CN108879593A (en) | 2018-08-05 | 2018-08-05 | A kind of list comparator overcurrent protection driving circuit and generator voltage controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108879593A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109782668A (en) * | 2019-01-27 | 2019-05-21 | 惠州三华工业有限公司 | To the control circuit and short circuit protection system of needle type print head conduction time |
-
2018
- 2018-08-05 CN CN201810881341.2A patent/CN108879593A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109782668A (en) * | 2019-01-27 | 2019-05-21 | 惠州三华工业有限公司 | To the control circuit and short circuit protection system of needle type print head conduction time |
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Application publication date: 20181123 |