CN104283472A - Voltage regulator and excessively-low-voltage protection circuit thereof - Google Patents
Voltage regulator and excessively-low-voltage protection circuit thereof Download PDFInfo
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- CN104283472A CN104283472A CN201310276387.9A CN201310276387A CN104283472A CN 104283472 A CN104283472 A CN 104283472A CN 201310276387 A CN201310276387 A CN 201310276387A CN 104283472 A CN104283472 A CN 104283472A
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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
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
- H02P9/26—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices
- H02P9/30—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices using semiconductor devices
- H02P9/305—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices using semiconductor devices controlling voltage
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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
- H02P9/006—Means for protecting the generator by using control
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- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
The invention discloses a voltage regulator and an excessively-low-voltage protection circuit thereof. The voltage regulator is coupled between a power generator without a storage battery and the grounding end, and the voltage regulator comprises the excessively-low-voltage protection circuit and an excitation current regulation unit. The excessively-low-voltage protection circuit comprises a voltage detection unit, multiple switch circuits and a power switch, and the voltage detection unit generates the first control signals according to output voltage of the power generator without the storage battery. The switch circuits are mutually connected and are under the control of the first control signals. The power switch is coupled to one of the switch circuits and an exciting coil. The excitation current regulation unit is used for controlling operation of the power switch according to the output voltage. The voltage detection unit detects whether the output voltage is lower than a threshold value and outputs the first control signals according to a detection result to control operation of the switch circuits sequentially so that the power switch can be selectively switched off.
Description
Technical field
The present invention has about a kind of protective circuit, and be particularly to a kind of for without storage battery air conditioner motor voltage-regulating system voltage regulator and cross low voltage protection circuit.
Background technology
Now, mobile carrier (such as automobile, bus etc.) generally has air-conditioner generator and the voltage-regulating system having battery generator.Battery generator is wherein had to be connected with storage battery and storage battery can be supplied after generate electricity to charge and on automobile, other electric equipments use.Air-conditioner generator does not couple with storage battery and drives running by engine itself, and is mainly used in the running maintaining air-conditioning system.Air-conditioner generator does not connect storage battery but uses capacitive to replace storage battery, and also namely the voltage-regulating system of air-conditioner generator is without battery voltage regulating system.
When air-conditioner generator occurs abnormal, such as, when out-put supply line comes off and forms short circuit and cause brownout, because air-conditioner generator does not couple with storage battery, so user cannot be informed by the warning lamp of storage battery, therefore, when air-conditioner generator occurs extremely still to continue idle running, the running of air-conditioning system can gently then be affected, heavy then may occur, because air-conditioner generator is overheated on fire and cause burning the serious problems such as car, to increase the probability that mobile carrier meets accident.
Summary of the invention
In view of this; the embodiment of the present invention provides a kind of voltage regulator and crosses low voltage protection circuit; it can in time being in abnormality without battery generator, and automatic forced ends the running without battery generator, to prevent without battery generator because of the overheated situation causing burning car on fire.
Above-mentioned voltage regulator is in order to the electricity of adjustment without the magnetizing coil of battery generator, and voltage regulator comprised low voltage protection circuit and exciting curent regulon.Wherein, cross low voltage protection circuit and comprise voltage detection unit, multiple switching circuit and power switch.Voltage detection unit is coupled to without battery generator and produces the first control signal according to the output voltage without battery generator, and described multiple switching circuit is controlled by the first control signal.Whether voltage detection unit detects output voltage lower than threshold value, and exports the first control signal according to testing result, sequentially controls the running of described multiple switching circuit, optionally to end this power switch.
Exciting curent regulon is coupled to power switch, and in order to according to the conducting of the output voltage control power switch without battery generator and deadline, to control the electric current of magnetizing coil.
The embodiment of the present invention separately provides a kind of and crosses low voltage protection circuit, and this crosses low voltage protection circuit and is coupled to without between battery generator and earth terminal.Cross low voltage protection circuit and comprise voltage detection unit, multiple switching circuit and power switch.Voltage detection unit is coupled to without battery generator, and produces the first control signal according to the output voltage without battery generator.Described multiple switching circuit is respectively coupled to without between the magnetizing coil of battery generator and earth terminal.Described multiple switching circuit is also controlled by the first control signal.Power switch is respectively coupled to one of described multiple switching circuit and the magnetizing coil without battery generator.
In one of them embodiment of the present invention, said switching circuit comprises the first switching circuit, second switch circuit and the 3rd switching circuit.First switching circuit is respectively coupled to magnetizing coil and earth terminal.First switching circuit is controlled by the first control signal.Second switch circuit is respectively coupled to magnetizing coil and earth terminal.Second switch circuit is coupled to the first switching circuit.3rd switching circuit is coupled to second switch circuit and power switch.
In one of them embodiment of the present invention, when voltage detection unit detects output voltage lower than threshold value, voltage detection unit exports the first control signal, the first switching circuit conducting is made to produce the second control signal, the running of cut-off second switch circuit conducting the 3rd switching circuit, with the running of stop power switch; When voltage detection unit detects output voltage higher than threshold value, voltage detection unit exports the first control signal and ends the first switching circuit, and make second switch circuit operate output the 3rd control signal, to end the running of the 3rd switching circuit, maintain the running of this power switch.
The embodiment of the present invention separately provides a kind of automobile-used voltage-regulating system, at least comprises two voltage-regulating systems, one of them be comprise above-mentioned voltage regulator without storage battery air conditioner motor voltage-regulating system.
In sum, the embodiment of the present invention provides a kind of voltage regulator and crosses low voltage protection circuit, by multiple sequence switch control circuit after a period of time, forces cut-off without the running of battery generator.Accordingly, voltage regulator and cross low voltage protection circuit can effectively prevent without battery generator because of overheated on fire and cause burn car situation generation.
For enable feature and the technology contents of further understanding the present invention, refer to the following detailed description about the present invention and accompanying drawing, but these illustrate and institute's accompanying drawings is only used for the present invention is described, but not any restriction is done to interest field of the present invention.
Accompanying drawing explanation
Fig. 1 is the functional block diagram without storage battery air conditioner motor voltage-regulating system that the embodiment of the present invention provides.
Fig. 2 is the thin portion circuit diagram of the voltage regulator that the embodiment of the present invention provides.
Fig. 3 is the functional block diagram of the automobile-used voltage-regulating system that the embodiment of the present invention provides.
Wherein, description of reference numerals is as follows:
1: without storage battery air conditioner motor voltage-regulating system
11,21: voltage regulator
110: cross low voltage protection circuit
111: voltage detection unit
113: control unit
1131: the first switching circuits
1132: second switch circuit
1133: the three switching circuits
115: power switch
120: exciting curent regulon
13,23: air-conditioner generator
131,231: magnetizing coil
233: stator coil
235: rectification unit
15,25: load unit
CB: electric capacity
RB: resistance
RL: load
2: automobile-used voltage-regulating system
27: have battery generator
29: storage battery
SW1: switch element
D1, D2: diode
EXC: excitatory end
F+: the positive terminals in magnetic field
F-: terminals are born in magnetic field
B+: power end
G, GND: earth terminal
R1 ~ R7: resistance
ZD1, ZD2, ZD3: voltage stabilizing didoe
C1, C2: electric capacity
Q1, Q4: power transistor
Q2, Q3A, Q3B, Q5A, Q5B transistor
V+: input voltage
Embodiment
The voltage regulator that main spirits of the present invention is providing a kind of tool to cross under-voltage protection mechanism, and this voltage regulator is applied to without battery generator voltage-regulating system.Therefore the framework of generator the non-invention part of focusing on, and art has and usually knows that the knowledgeable should know framework and the operation principles of generator, therefore do not repeat at this, and only sketch part related to the present invention.In the present invention is be described for air-conditioner generator without battery generator, but the present invention is not as limit.
(being applied to the embodiment without storage battery air conditioner motor voltage-regulating system)
Fig. 1 illustrates the functional block diagram without storage battery air conditioner motor voltage-regulating system that the embodiment of the present invention provides.As shown in Figure 1, voltage regulator 11, air-conditioner generator 13 and load unit 15 is comprised without storage battery air conditioner motor voltage-regulating system 1.Voltage regulator 11 is coupled to air-conditioner generator 13 and load unit 15.
Voltage regulator 11, by the magnitude of current of the magnetizing coil (not being illustrated in Fig. 1) of regulating and controlling air-conditioner generator 13, regulates the generating voltage of air-conditioner generator 13, to maintain the running of load unit 15.Voltage regulator 11 in air-conditioner generator 13, exception can occur, such as cannot set up voltage or energy output too low time, force the running of cut-off air-conditioner generator 13, to protect air-conditioner generator 13.
Air-conditioner generator 13 is connected with there being battery voltage regulating system by an external switch (not illustrating).Air-conditioner generator 13 can have idle running and generating two kinds of operating modes.When external switch is in disconnection (open) pattern, when namely external switch is not activated yet, air-conditioner generator 13 can be in idle mode because engine running drives, and also namely air-conditioner generator 13 operates but do not generate electricity.When external switch is in closedown (close) pattern, also namely external switch be unlocked conducting time, namely air-conditioner generator 13 can receive exciting curent that battery generator provides and start generating.The exciting curent that air-conditioner generator 13 can be provided by outside, starts generating in separate excitation mode.
In the present embodiment, load unit 15 comprises a capacity cell (not being illustrated in Fig. 1) and a load (not being illustrated in Fig. 1), and wherein capacity cell is in parallel with load.Capacity cell can be used for providing exciting curent to air-conditioner generator 13 through voltage regulator 11 after air-conditioner generator 13 generates electricity.In addition, capacity cell separately can carry out voltage stabilizing and filtering in order to the voltage produced after generating electricity to air-conditioner generator 13.Namely, the output voltage that air-conditioner generator 13 running produces after the voltage stabilizing of capacity cell filtering noise information, can reoffer to load.Load is consume the element that air-conditioner generator 13 operates the electric power exported, such as, be fan or air-conditioning equipment etc.
Voltage regulator 11 comprised low voltage protection circuit 110 and exciting curent regulon 120.Cross low voltage protection circuit 110 and be coupled to exciting curent regulon 120.
Cross low voltage protection circuit 110 and comprise voltage detection unit 111, control unit 113 and power switch 115 further.Voltage detection unit 111 couples load unit 15 and control unit 113.Control unit 113 couples power switch 115.Power switch 115 is coupled between exciting curent regulon 120 and air-conditioner generator 13.Power switch 115 is separately connected mutually with the magnetizing coil (not illustrating) of air-conditioner generator 13.
And control unit 113 also comprises the first switching circuit 1131, second switch circuit 1132 and the 3rd switching circuit 1133.First switching circuit 1131 is coupled between voltage detection unit 111 and second switch circuit 1132.3rd switching circuit 1133 is coupled between second switch circuit 1132 and power switch 115.
Voltage detection unit 111 in order to whether to detect the output voltage of air-conditioner generator 13 lower than threshold value, and controls the running of control unit 113 according to testing result.Voltage detection unit 111 can export the running of the first control signal sequentially drived control first switching circuit 1131, second switch circuit 1132 and the 3rd switching circuit 1133 according to testing result, according to this optionally stop power switch.
And exciting curent regulon 120 can under air-conditioner generator 13 normal power generation, according to detecting that the output voltage height of air-conditioner generator 13 comes conducting or the deadline of Modulating Power switch 115.In other words, exciting curent regulon 120 is by Modulating Power switch 115 in work period conducting or the ratio of deadline, and adjustment flows through the electric current of the magnetizing coil of air-conditioner generator 13, operates to control air-conditioner generator 13 energy output produced.
When air-conditioner generator 13 starts generating, and during exciting curent regulon 120 conducting power switch 115 (also after external switch is opened), voltage detection unit 111 can in time detecting the output voltage of air-conditioner generator 13 lower than threshold value, judge that air-conditioner generator 13 exception occurs and exports the first control signal conducting first switching circuit 1131, with the running making the first switching circuit 1131 export the second control signal cut-off second switch circuit 1132, and conducting the 3rd switching circuit 1133, with the running of stop power switch 115.Thus control unit 113, by forcing stop power switch 115, cuts off the path of exciting curent, to close air-conditioner generator 13.
In addition, under air-conditioner generator 13 normal power generation, exciting curent regulon 120 can according to the output voltage of air-conditioner generator 13, the conducting of regulating power switch 115 accordingly and deadline.
Under air-conditioner generator 13 normal power generation, when exciting curent regulon 120 detects that the output voltage of air-conditioner generator 13 is too high, exciting curent regulon 120 can increase the deadline of power switch 115 in a work period, to reduce the electric current of magnetizing coil, and then reduce the output voltage of air-conditioner generator 13; When exciting curent regulon 120 detects that the output voltage of air-conditioner generator 13 is too low, exciting curent regulon 120 can increase the ON time of power switch 115 in a work period, to increase the electric current of magnetizing coil, and then promote the output voltage of air-conditioner generator 13 generation.
For example, for 28 volts without storage battery air conditioner motor voltage-regulating system, threshold value is such as 22 volts.When voltage detection unit 111 detects the output voltage after air-conditioner generator 13 generating lower than 22 volts, the conducting that can export first switching circuit 1131, second switch circuit 1132 and three switching circuit 1133 of the first control signal signal of high-voltage level (such as) sequentially in driving control unit 115 operates with cut-off, makes the 3rd switching circuit 1133 force the running of stop power switch 115.
Otherwise, when voltage detection unit 111 detects the output voltage after air-conditioner generator 13 generating higher than 22 volts, then can export the first control signal is such as the signal of low voltage level) conducting of the first switching circuit 1131, second switch circuit 1132 and the 3rd switching circuit 1133 sequentially in drived control control unit 115 operates with cut-off, makes the 3rd switching circuit 1133 can not affect the running of power switch 115.Now, the running of power switch 115 is regulated accordingly by the output voltage of exciting curent regulon 120 according to air-conditioner generator 13.
Accordingly, voltage regulator 11 of the present invention by the output voltage of active detecting air-conditioner generator 13, and when air-conditioner generator 13 occurs abnormal, such as, causes short circuit because out-put supply line comes off, the running of positive closing air-conditioner generator 13.Thus voltage regulator 11 can protect air-conditioner generator 13, and avoid air-conditioner generator 13 because of the overheated problem that car occurs to burn on fire.
Do one without an embodiment of the voltage regulator of battery generator and function mode illustrate for being applied to below.Voltage regulator 11 is such as five-line voltage regulator, please refer to Fig. 2, and it has excitatory end EXC, the positive terminals F+ in magnetic field, terminals F-, power end B+ and earth terminal GND are born in magnetic field.Power end B+ couples load unit 15.Excitatory end EXC couples an external switch SW1 via diode D2, to receive an input voltage V+ and an exciting curent when the external switch SW1 conducting.The positive terminals F+ in magnetic field is coupled to the first end of the magnetizing coil 131 of air-conditioner generator (not being illustrated in Fig. 2).The second end that terminals F-is coupled to magnetizing coil 131 is born in magnetic field.
The first end of external switch SW1 can be the storage battery (not being illustrated in Fig. 2) be coupled in the voltage regulator system of battery generator (not being illustrated in Fig. 2).Second end of external switch SW1 couples the anode of diode D2.The negative electrode of diode D2 is coupled to excitatory end EXC.Accordingly, exciting curent when external switch SW1 conducting, can be introduced by excitatory end EXC by diode D2, drives magnetizing coil 131 excitatory with terminals F+ positive through magnetic field, to produce the generating of field drives air-conditioner generator.
Load unit 15 comprises load RL, resistance RB and electric capacity CB.Load RL represents the electronic component consuming air-conditioner generator output power, such as, be fan or air-conditioning equipment etc., and wherein in practice, load RL just exists when outside interrupteur SW 1 is opened.The first end of electric capacity CB is coupled to the power end B+ of voltage regulator 11, and second end of electric capacity CB is coupled to earth terminal GND.Resistance RB is in parallel with electric capacity CB, during in order to (if load RL is 0) in an unloaded situation, provides a discharge path to electric capacity CB.Load RL is in parallel with electric capacity CB.The parallel circuits of electric capacity CB and resistance RB, for the output voltage of air-conditioner generator, has filtering and voltage stabilizing effectiveness.
The power switch 115 crossed in low voltage protection circuit 110 has input, output and control end.The input of power switch 115 couples the anode of free-wheel diode D1, and its output is coupled to earth terminal GND, and its control end is respectively coupled to exciting curent regulon 120 and the 3rd switching circuit 1133.In the present embodiment, power switch 115 realizes with power transistor Q1.The grid of power transistor Q1 is coupled to exciting curent regulon 120 and the 3rd switching circuit 1133, and its source electrode is coupled to earth terminal GND, and its drain electrode is coupled to the anode of free-wheel diode D1.Accordingly, exciting curent regulon 120 by the grid voltage regulating power switch 115 that controls power transistor Q1 in the conducting of a work period and deadline, to adjust the magnitude of current of magnetizing coil.
Voltage detection unit 111 comprises bleeder circuit, voltage detector component and the first switch.Bleeder circuit comprises resistance R1, R2; Voltage detector component comprises voltage stabilizing didoe ZD1; First switch comprises transistor Q2.First switch also can comprise that resistance R3 is coupled to transistor Q2 between base stage and emitter-base bandgap grading.
The first end of resistance R1 is coupled to earth terminal GND, and second end of resistance R1 is coupled to the first end of resistance R2.Second end of resistance R2 is then coupled to power end B+ and exciting curent regulon 120.Node between the negative electrode coupling resistance R1 of voltage stabilizing didoe ZD1 and resistance R2, and the anode of voltage stabilizing didoe ZD1 is coupled to the base stage of transistor Q2.Collector coupling first switching circuit 1131 of transistor Q2, its emitter-base bandgap grading is coupled to earth terminal GND.
For voltage stabilizing didoe ZD1, bleeder circuit, in order to capture the voltage (being also the output voltage of corresponding air-conditioner generator) of power end B+, judges whether the voltage of power end B+ is less than threshold value.When the voltage of power end B+ is greater than threshold value, voltage stabilizing didoe ZD1 conducting makes transistor Q2 export the first switching circuit 1131 of the first control signal cut-off control unit 113 in collector.When the voltage of power end B+ is less than threshold value, voltage stabilizing didoe ZD1 is in cut-off state, and now, transistor Q2 ends and exports the first switching circuit 1131 of the first control signal conducting control unit 113 in collector.
In addition, the resistance value of resistance R1 and resistance R2 and the specification of voltage stabilizing didoe ZD1 can be select to design according to threshold value.
First switching circuit 1131 comprises resistance R4, R5, voltage stabilizing didoe ZD2, electric capacity C1 and second switch and the 3rd switch, and wherein second switch comprises transistor Q3A, and the 3rd switch comprises transistor Q3B; Second switch circuit 1132 comprises resistance R6, R7, electric capacity C2, voltage stabilizing didoe ZD3 and the 4th switch, and wherein the 4th switch comprises power transistor Q4; 3rd switching circuit 1133 comprises the 5th switch and the 6th switch, and wherein the 5th switch comprises transistor Q5A and the 6th switch comprises transistor Q5B.
The first end of resistance R4 is coupled to excitatory end EXC, and second end of resistance R4 is coupled to the negative electrode of voltage stabilizing didoe ZD2.The anode of voltage stabilizing didoe ZD2 is coupled to the first end of electric capacity C1.Second end of electric capacity C1 is through earth terminal GND ground connection.In other words, resistance R4, voltage stabilizing didoe ZD2 and electric capacity C1 are series between excitatory end EXC and earth terminal GND.Node between the anode of voltage stabilizing didoe ZD2 and the first end of electric capacity C1 is coupled to the collector of transistor Q2 and the base stage of transistor Q3B.
Voltage stabilizing didoe ZD2 in order to avoid transistor Q3B because of air-conditioner generator in idle running produce micro-voltage and miss start.Separately, resistance R4 and electric capacity C1 contacts the ON time of formation one circuit in order to delay crystal pipe Q3B, and conducting after a period of time after the first control signal making transistor Q3B receive in order to activation.
The first end of resistance R5 is coupled to excitatory end EXC, the second end emitter-base bandgap grading of coupling transistors Q3A and collector of transistor Q3B respectively of resistance R5.Resistance R5 is series between the collector of excitatory end EXC and Q3B, to control the electric current being flowed through transistor Q3B by excitatory end EXC.The emitter-base bandgap grading of transistor Q3A and base stage are electrical connected and are coupled to the collector of transistor Q3B.The emitter-base bandgap grading of transistor Q3B is coupled to earth terminal GND.The collector of transistor Q3A then couples the grid of the power transistor Q4 of second switch circuit 1132, to export the second control signal conducting or stop power transistor Q4.The base emitter base diode circuit running of transistor Q3A is equivalent to a diode, can export the second control signal that the transistor Q3B of the first switching circuit 1131 produces according to the first control signal to power transistor Q4 through collection emitter-base bandgap grading end.During actual operation, transistor Q3A can when transistor Q3B ends, the grid voltage of pull-up power transistor Q4, with conducting power transistor Q4, otherwise transistor Q3A is when transistor Q3B conducting, stop charging to electric capacity C2, power transistor Q4 will close in its grid voltage lower than during certain value.
The drain electrode of power transistor Q4 is coupled to excitatory end EXC through resistance R7.The source electrode of power transistor Q4 is coupled to earth terminal GND.The second control signal that the grid of power transistor Q4 exports in the collection emitter-base bandgap grading of transistor Q3A as aforementioned controlled.The negative electrode of voltage stabilizing didoe ZD3 couples the grid of power transistor Q4, and its anode couples earth terminal GND.Voltage stabilizing didoe ZD3 is coupled between the grid of power transistor Q4, source electrode, when being used to power transistor Q4 conducting, and firm power transistor Q4 gate-source voltage.The first end of resistance R6 is coupled to the grid of transistor Q4, and second end of resistance R6 couples earth terminal GND.The first end of electric capacity C2 couples the grid of power transistor Q4, and its second end couples earth terminal GND.Resistance R6 is in parallel with electric capacity C2 forms a discharge loop, in order to extend the ON time of power transistor Q4.Resistance R6 and electric capacity C2 can, after a period of time of the second control signal stop power transistor Q4, make power transistor Q4 end running.The parallel circuits of resistance R6 and electric capacity C2 is another and voltage stabilizing didoe ZD3 is parallel with one another.
The base stage of transistor Q5A couples mutually with emitter-base bandgap grading, and is separately coupled to the grid (i.e. the control end of power switch) of power transistor Q1.The collector of the collector of transistor Q5A then coupling transistors Q5B.The emitter-base bandgap grading of transistor Q5B couples earth terminal GND.And the base stage of transistor Q5B couples the drain electrode of power transistor Q4, and be controlled by power transistor Q4.Accordingly, second switch circuit 1132 exports the 3rd control signal by power transistor Q4 and controls the running of the 3rd switching circuit 1133, also the running of i.e. optionally conducting or "off" transistor Q5B.Transistor Q5A can according to the running of the running of transistor Q5B optionally stop power transistor Q1.
Power transistor Q4 in the present embodiment is in external switch SW1 at air-conditioner generator and closes (close) conducting moment in the present embodiment, can prior to transistor Q3B conducting, with the running of "off" transistor Q5B, avoid power transistor Q1 because of in air-conditioner generator idle running or start to generate electricity time, the voltage of power end B+ is low and by transistor Q5A, Q5B positive closing.
In the present embodiment, the charging interval of electric capacity C1 is controlled by the capacitance of electric capacity C1 and the resistance value of resistance R4.When electric capacity C1 charges electricity, namely can turn-on transistor Q3B, and the grid that second of output LOW voltage level controls signal to power transistor Q4, with the grid voltage of drop-down power transistor Q4.
When electric capacity C2 is discharged through resistance R6, namely power transistor Q4 decommissions.The discharge time of electric capacity C2 is controlled by the capacitance of design configurations electric capacity C2 and the resistance value of resistance R6.After power transistor Q4 ends, the 3rd control signal turn-on transistor Q5B can be exported in the drain electrode of power transistor Q4, force the running of stop power transistor Q1 subsequently, and then the running of positive closing air-conditioner generator.In brief, when air-conditioner generator cannot at Preset Time, such as, air-conditioner generator is allowed to generate electricity in 3 to 4 seconds, namely voltage regulator 11 can force the running of stop power transistor Q1 with the road 1133 of conducting the 3rd switch by cut-off second switch circuit 1132, and then the running of positive closing air-conditioner generator.In other words, when air-conditioner generator starts generating, if the voltage of power end B+ is not more than Preset Time lower than time of threshold value, air-conditioner generator still can normally work running; Otherwise if when the voltage of power end B+ exceedes Preset Time lower than time of threshold value, namely voltage regulator 11 can force the running of stop power transistor Q1, until just can recover normal work in external switch SW1 again switched conductive to electricity.
Preset Time is arranged by the summation of the charging interval of design capacitance C1 and the discharge time of electric capacity C2, power transistor Q4 is realized by NMOS power metal-oxide-semiconductor field-effect transistor, transistor Q1, Q2, Q3A, Q3B, Q5A and Q5B can be NPN bipolar transistors, certain the present invention is not limited with above-mentioned, has usually know that the knowledgeable can the suitable alternative elements type of unrestricted choice or specification in the technical field of the invention.
In addition, voltage detection unit 111 can be realized by comparator, such as, the first input end (such as positive input terminal) of comparator couples power end B+, and second input (such as negative input end) of comparator couples reference voltage V_REF.The base terminal of the output coupling transistors Q2 of comparator.Accordingly, comparator can according to the comparative result of the voltage of power end B+ and reference voltage V_REF, correspondingly exports the first control signal, with conducting or cut-off the first switching circuit 1131.
The present invention separately provides voltage regulator to be applied to the execution mode of automobile-used voltage-regulating system.Please refer to Fig. 3, the automobile-used voltage-regulating system 2 of the present embodiment at least comprises two voltage-regulating systems, and one of them presses regulating system for there being storage battery, and another is without storage battery pressure regulating system.Be without storage battery air conditioner motor voltage-regulating system without battery voltage regulating system, it comprises voltage regulator 21, air-conditioner generator 23 and load unit 25.There is battery voltage regulating system to include battery generator 27 and storage battery 29, wherein have battery generator 27 to couple storage battery 29.Air-conditioner generator 23 comprises magnetizing coil 231, stator coil 233 and rectification unit 235, and wherein stator coil 233 couples rectification unit 235.Load unit 25 comprises the parallel circuits of electric capacity CB, resistance RB and load RL.
The excitatory end EXC of voltage regulator 21 couples storage battery 29 through diode D2, external switch SW1, to receive the exciting curent that storage battery 29 provides.Excitatory end EXC couples air-conditioner generator 23, and the positive terminals F+ in magnetic field is coupled to the first end of magnetizing coil 231, and the second end that terminals F-is coupled to magnetizing coil 231 is born in magnetic field, and power end B+ couples load unit 25 and air-conditioner generator 23, earth terminal GND ground connection.Voltage regulator 21 can be the five-line voltage regulator of previous embodiment, and load RL is fan and air-conditioning equipment etc.
As shown in Figure 3, when external switch SW1 conducting, the exciting curent that magnetizing coil 231 can provide through the excitatory end EXC reception storage battery 29 of voltage regulator 21, operates generating to start air-conditioner generator 23, is then controlled the output voltage of air-conditioner generator 23 by voltage regulator 21.
When voltage regulator 21 judge air-conditioner generator 23 can normal power generation time, voltage regulator 21 can carry out the On current of management and control stator coil 233 by the exciting curent that adjustment flows through excitatory end EXC, the positive terminals F+ in magnetic field, terminals F-is born in magnetizing coil 231 and magnetic field.Meanwhile, voltage regulator 21 also can regulate the output voltage of air-conditioner generator 23 to be supplied to load RL.
When voltage regulator 21 judges that exception occurs air-conditioner generator 23, namely cannot just hall generating time, voltage regulator 21 can bear the excitatory path that terminals F-formed, to end the running of air-conditioner generator 23 by force disconnect by excitatory end EXC, magnetic field positive terminals F+, magnetizing coil 231 and magnetic field.Accordingly, the overheated situation burning car that causes on fire of air-conditioner generator 23 can be avoided to occur.
In another embodiment, voltage regulator 21 can be integrated in a chip, and this chip at least tool five terminals, also namely terminals F-and earth terminal GND is born in power end B+, excitatory end EXC, the positive terminals F+ in magnetic field, magnetic field, in this uses, the output voltage detection mode of air-conditioner generator 23 and operating control mode write by firmware and/or hardware circuit design mode is implemented, and the present embodiment does not limit.
The foregoing is only the embodiment of the present invention, it is also not used to the scope of the claims limiting to the present invention.
Claims (15)
1. a voltage regulator, in order to adjust one without the electricity of a magnetizing coil of battery generator, it is characterized in that, this voltage regulator comprises:
One crosses low voltage protection circuit, is coupled to this without between battery generator and an earth terminal, and this is crossed low voltage protection circuit and comprises:
One voltage detection unit, is coupled to this without battery generator, produces one first control signal according to this output voltage without battery generator;
Multiple switching circuit, is respectively coupled between this this magnetizing coil without battery generator and this earth terminal, and described multiple switching circuit is also controlled by this first control signal; And
One power switch, is respectively coupled to one of described multiple switching circuit and this this magnetizing coil without battery generator; And
One exciting curent regulon, is coupled to this power switch, and in order to according to the conducting of this this power switch of output voltage control and deadline, to control the electric current of this magnetizing coil;
Wherein whether this voltage detection unit detects this output voltage lower than a threshold value, and this voltage detection unit also exports this first control signal according to testing result, sequentially controls the running of described multiple switching circuit, optionally to end this power switch.
2. voltage regulator as claimed in claim 1, wherein when this voltage detection unit detects this output voltage lower than this threshold value, and during this this power switch of exciting curent regulon conducting, this voltage detection unit sequentially controls described multiple switching circuit and ends this power switch.
3. voltage regulator as claimed in claim 1, wherein said multiple switching circuit comprises:
One first switching circuit, is respectively coupled to this magnetizing coil and this earth terminal, and this first switching circuit is controlled by this first control signal;
One second switch circuit, is respectively coupled to this magnetizing coil and this earth terminal, and this second switch circuit also couples this first switching circuit;
One the 3rd switching circuit, is coupled to this earth terminal, and the 3rd switching circuit is also coupled between this second switch circuit and this power switch; And
Wherein when this voltage detection unit detects this output voltage lower than this threshold value, this voltage detection unit exports this first control signal, this the first switching circuit conducting is made to produce one second control signal, end the running of this second switch circuit and conducting the 3rd switching circuit, to end the running of this power switch.
4. voltage regulator as claimed in claim 3, wherein when this voltage detection unit detects this output voltage higher than this threshold value, this voltage detection unit exports this first control signal and ends this first switching circuit, and make this second switch circuit operate output 1 the 3rd control signal, to end the running of the 3rd switching circuit, and make this exciting curent regulon according to the conducting of this this power switch of output voltage control and deadline.
5. voltage regulator as claimed in claim 4, wherein when this first switching circuit conducting exports this second control signal to end this second switch circuit, this second switch circuit is cut-off running after a Preset Time.
6. voltage regulator as claimed in claim 3, wherein this voltage detection unit comprises:
One bleeder circuit, comprising:
One first resistive element, its first end is coupled to this earth terminal; And
One second resistive element, its first end is coupled to the second end of this first resistive element, and the second end of this second resistive element is coupled to this without battery generator;
One voltage detector component, the first end of this voltage detector component is coupled to the first end of this first resistive element, to detect this output voltage; And
One first switch, have a first input end, one first output, one first control end, this first output is coupled to this earth terminal, and this first control end is coupled to the second end of this voltage detector component;
Wherein this voltage detector component drives this first switch to produce this first control signal in this first input end according to this output voltage.
7. voltage regulator as claimed in claim 6, wherein this first switching circuit comprises:
One second switch, have one second input, one second output, one second control end, this second input is coupled to this magnetizing coil, and this second control end is coupled to this in the second input; And
One the 3rd switch, there is one the 3rd input, one the 3rd output, one the 3rd control end, 3rd input is coupled to this magnetizing coil, 3rd output is coupled to this earth terminal, 3rd control end is coupled to this first input end, to make this second switch produce this second control signal in this second output according to this first control signal.
8. voltage regulator as claimed in claim 7, wherein this second switch circuit comprises:
One the 4th switch, there is a four-input terminal, one the 4th output, one the 4th control end, this four-input terminal is coupled to this magnetizing coil, 4th output is coupled to this earth terminal, 4th control end is coupled to this second output, to produce the 3rd control signal according to this second control signal in this four-input terminal.
9. voltage regulator as claimed in claim 1, wherein this power switch is connected with this magnetizing coil.
10. voltage regulator as claimed in claim 1, wherein this voltage detection unit couples a load unit, and this load unit comprises:
One load;
One first capacity cell, the first end of this first capacity cell is coupled to this without battery generator and this voltage detection unit, and the second end of this first capacity cell is coupled between this earth terminal, and this first capacity cell is in parallel with this load; And
One first releases element, with this first Capacitance parallel connection.
Cross low voltage protection circuit, couple one without between battery generator and an earth terminal, it is characterized in that this is crossed low voltage protection circuit and comprises for 11. 1 kinds:
One voltage detection unit, is coupled to this without battery generator, produces one first control signal according to this output voltage without battery generator;
Multiple switching circuit, is respectively coupled between this this magnetizing coil without battery generator and this earth terminal, and described multiple switching circuit is also controlled by this first control signal; And
One power switch, is respectively coupled to one of described multiple switching circuit and this this magnetizing coil without battery generator;
Wherein whether this voltage detection unit detects this output voltage lower than a threshold value, and this voltage detection unit also exports this first control signal according to testing result, sequentially controls the running of described multiple switching circuit, optionally to end this power switch.
12. low voltage protection circuits excessively as claimed in claim 11, wherein said multiple switching circuit also comprises:
One first switching circuit, be respectively coupled to this magnetizing coil without battery generator and this earth terminal, and this first switching circuit is controlled by this first control signal;
One second switch circuit, is respectively coupled to this magnetizing coil and this earth terminal, and this second switch circuit be coupled to this first switching circuit; And
One the 3rd switching circuit, couples between this second switch circuit and this power switch;
Wherein when this voltage detection unit detects this output voltage lower than this threshold value, this voltage detection unit exports this first control signal, this the first switching circuit conducting is made to produce one second control signal, end the running of this second switch circuit and conducting the 3rd switching circuit, to end the running of this power switch.
13. low voltage protection circuits excessively as claimed in claim 12; wherein when this voltage detection unit detects this output voltage higher than this threshold value; this voltage detection unit exports this first control signal and ends this first switching circuit; and make this second switch circuit operate output 1 the 3rd control signal; to end the running of the 3rd switching circuit, maintain the running of this power switch.
14. low voltage protection circuits excessively as claimed in claim 12, wherein when this first switching circuit conducting exports this second control signal to end this second switch circuit, this second switch circuit is cut-off running after a Preset Time.
15. low voltage protection circuits excessively as claimed in claim 11, wherein this power switch is connected with this magnetizing coil.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310276387.9A CN104283472B (en) | 2013-07-03 | 2013-07-03 | Voltage regulator and its excessively low voltage protection circuit |
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| CN201310276387.9A CN104283472B (en) | 2013-07-03 | 2013-07-03 | Voltage regulator and its excessively low voltage protection circuit |
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| CN104283472B CN104283472B (en) | 2017-06-20 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017201214A1 (en) * | 2016-05-17 | 2017-11-23 | Texas Instruments Incorporated | Generating the under voltage protection threshold |
| CN110120652A (en) * | 2019-05-30 | 2019-08-13 | 宁波奥克斯电气股份有限公司 | A kind of method, system and air conditioner for preventing power down from accidentally protecting |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2664278Y (en) * | 2003-10-31 | 2004-12-15 | 上海新华电子设备有限公司 | DC/DC power supply module having under-voltage and current-limiting protection |
| JP2008026947A (en) * | 2006-07-18 | 2008-02-07 | Seiko Instruments Inc | Voltage regulator |
| CN101577445B (en) * | 2008-05-07 | 2012-07-04 | 环旭电子股份有限公司 | Adjustable voltage regulation circuit and operating method thereof |
-
2013
- 2013-07-03 CN CN201310276387.9A patent/CN104283472B/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017201214A1 (en) * | 2016-05-17 | 2017-11-23 | Texas Instruments Incorporated | Generating the under voltage protection threshold |
| CN110120652A (en) * | 2019-05-30 | 2019-08-13 | 宁波奥克斯电气股份有限公司 | A kind of method, system and air conditioner for preventing power down from accidentally protecting |
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| Publication number | Publication date |
|---|---|
| CN104283472B (en) | 2017-06-20 |
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