CN105811750A - Lightning-stroke protection voltage-stabilizing power supply with ultra-wide voltage input function, and current-limiting and voltage-stabilizing method therefor - Google Patents
Lightning-stroke protection voltage-stabilizing power supply with ultra-wide voltage input function, and current-limiting and voltage-stabilizing method therefor Download PDFInfo
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- CN105811750A CN105811750A CN201610263975.2A CN201610263975A CN105811750A CN 105811750 A CN105811750 A CN 105811750A CN 201610263975 A CN201610263975 A CN 201610263975A CN 105811750 A CN105811750 A CN 105811750A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/569—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
- G05F1/573—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection with overcurrent detector
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Abstract
The invention discloses a current-limiting and voltage-stabilizing method for a lightning-stroke protection voltage-stabilizing power supply with an ultra-wide voltage input function. The current-limiting and voltage-stabilizing method comprises the following steps of (1) setting a voltage-stabilizing power supply, wherein the voltage-stabilizing power supply comprises a high-voltage pulse protection circuit, a rectifier circuit, a voltage division circuit and a voltage-stabilizing circuit; (2) presetting a conduction voltage of a piezoresistor, wherein when the input end voltage is higher than the conduction voltage, the piezoresistor is conduced; the current passing through the piezoresistor is increased, and the resistance value of the piezoresistor is increased, so that the overall voltage-stabilizing power supply circuit is protected; (3) enabling the rectifier circuit to convert the alternating current into direct current; (4) enabling the voltage division circuit to carry out voltage division on the voltage at the output end of the rectifier circuit; and (5) enabling the voltage-stabilizing circuit to adjust the current so as to fulfill the purpose of current limiting and voltage stabilizing. The invention also discloses the lightning-stroke protection voltage-stabilizing power supply with the ultra-wide voltage input function. The voltage-stabilizing power supply provided by the invention can be resistant to high voltage pulse impact, as well as can realize the ultra-wide voltage input effect.
Description
Technical field
The present invention relates to a kind of regulated power supply, particularly relating to anti-lightning can the regulated power supply of super wide voltage input and flow-limiting voltage-stabilizing method thereof.
Background technology
Along with society burns the wind, electrical equipment grows with each passing day.But the aging and lagging in development of electrical power distribution facility, and design the reasons such as bad and electricity shortage and cause the too low of terminal temperature difference voltage, then often voltage is higher for the end of a thread user.To electrical equipment particularly to the strict high and new technology of voltage request and precision equipment, just as not insuring.Unstable voltage can cause mortal injury or misoperation to equipment, and impact produces, and causes many-sided loss such as delay at date of delivery, quality instability.Simultaneously acceleration equipment aging, affect and even burns accessory service life, make owner face the puzzlement needed repairing or in a short time will more new equipment, waste resource；Even there is security incident in severe patient, causes immeasurable loss.Therefore, select stabilized power source can provide for equipment and stablize alternating current or unidirectional current, it is ensured that equipment properly functioning.
But, stable alternating current or galvanic regulated power supply only can be provided can not to meet the equipment demand to voltage under all scenario.Such as, civil power ammeter or other city's pyroelectric monitor device circuit power supply, without the test pencil of battery or survey ammeter etc..This kind of device uses owing to supplying measuring circuit from measured source power taking, therefore regulated power supply need adapt to super wide voltage input (as: 12V～1000V), and require the electric current that measured source is drawn only small (as: European standard≤3mA), require to resist thunderbolt simultaneously.
But, existing regulated power supply mainly adopts the mode of the Switching Power Supply of resistance-capacitance depressurization or complexity to obtain low pressure source, this mode all can not realize super wide voltage input, and input voltage range can not adjust flexibly, can not bear the impact of more than 8000V pulse voltage simultaneously.
Therefore, working out one can impact by anti-high-voltage pulse, can super wide voltage input, and the input range of voltage can be adjusted as required flexibly to obtain current-limiting voltage-stabilizing power source and the flow-limiting voltage-stabilizing method thereof of low pressure, it appears comparatively urgent.
Summary of the invention
For above-mentioned deficiency, it is an object of the invention to provide a kind of anti-lightning can super wide voltage input regulated power supply and flow-limiting voltage-stabilizing method, with solve existing regulated power supply cannot be carried out super wide voltage input, input voltage range can not adjust flexibly and can not bear high-voltage pulse impact problem.Regulated power supply provided by the invention, the appropriate design to whole circuit, in conjunction with the flow-limiting voltage-stabilizing method of regulated power supply provided by the invention, realize anti-high-voltage pulse to impact, can input by super wide voltage, and the input range of voltage can be adjusted as required flexibly, to obtain the effect of the flow-limiting voltage-stabilizing of low pressure.
The present invention be the technical scheme is that by reaching above-mentioned purpose
A kind of anti-lightning can the flow-limiting voltage-stabilizing method of regulated power supply of super wide voltage input, it is characterised in that comprise the following steps:
(1) arranging a regulated power supply, this regulated power supply includes high-voltage impulse protection circuit, rectification circuit, bleeder circuit and mu balanced circuit, and wherein, described high-voltage impulse protection circuit is in series by several critesistor and several varistors；Described rectification circuit is formed by several Diode series；Described bleeder circuit is made up of several high pressure field effect transistor and several first resistance；Described mu balanced circuit is made up of with Zener diode audion, the second resistance；
(2) conducting voltage of varistor in preset high-pressure pulse protection circuit; when the input terminal voltage of high-voltage impulse protection circuit is higher than the conducting voltage of varistor; varistor turns on; the electric current flowing through critesistor increases; thus increasing the resistance of critesistor, then whole voltage-stabilized power supply circuit is protected；
(3) in described rectification circuit, the electric current of several diode pair high-voltage impulse protection circuit outfans of series connection carries out rectification, and alternating current is converted to unidirectional current；
(4) several high pressure field effect transistor in described bleeder circuit are connected in series, several first resistant series are formed series arm simultaneously, and the grid of each high pressure field effect transistor is connected in series arm, the voltage of rectification circuit output end is carried out dividing potential drop, make the grid even voltage of each high pressure field effect transistor, and the drain electrode of each high pressure field effect transistor and source electrode even voltage；
(5) audion in described mu balanced circuit and the second resistance composition constant-current source, the electric current flowing through mu balanced circuit is dynamically regulated, make constant current hold, this constant-current source and Zener diode composition source of stable pressure, when the electric current flowing through the second resistance increases, the conducting degree of audion strengthens, and then drags down the grid voltage of each high pressure field effect transistor, so that the conducting degree of each high pressure field effect transistor reduces and dividing potential drop increase, reach the purpose of flow-limiting voltage-stabilizing.
As a further improvement on the present invention, in described step (1), the resistance of several the first resistance described is all identical.
As a further improvement on the present invention, in described step (5), the electric current I=0.6/ (resistance value of the second resistance) of the constant-current source of described audion and the second resistance composition.
As a further improvement on the present invention; further comprising the steps of: (6) are at gate series one current foldback circuit of each high pressure field effect transistor; when outer load charging current is excessive; voltage is added to the grid of high pressure field effect transistor by current foldback circuit after postponing a period of time, to avoid bleeder circuit to produce parasitic pressure drop.
As a further improvement on the present invention, the current foldback circuit in described step (6) is the delay circuit being made up of the 3rd resistance and the first electric capacity.
As a further improvement on the present invention, further comprising the steps of: (7) connect a current monitoring circuit at the outfan of mu balanced circuit, this current monitoring circuit is composed in parallel by the 4th resistance and current parallel monitor chip, the voltage drop flowing through the 4th resistance generation is changed into electric current by this current parallel monitor chip, and converts the current to voltage signal.
As a further improvement on the present invention, described step (7) specifically includes following steps:
(7.1) operational amplifier, NPN transistor, the 5th resistance, the 6th resistance and audion are set at the internal circuit of current parallel monitor chip, wherein, the in-phase input end of this operational amplifier is connected to the 5th resistance one end, reverse input end is connected to the 6th resistance one end, outfan is connected with the base stage of NPN transistor, the colelctor electrode of this NPN transistor is connected to the other end of the 5th resistance, and the emitter stage of this NPN transistor connects an outer meeting resistance；
(7.2) when described circuit output end of pressure-stabilizing electric current flows through four resistance, produce a voltage drop, when on the 5th resistance that voltage drop is applied to current parallel monitor chip internal, the internal circuit of this current parallel monitor chip enters the colelctor electrode of NPN transistor by producing an electric current, and output electric current is changed into voltage signal by outer meeting resistance.
A kind of implement said method can super wide voltage input current-limiting voltage-stabilizing power source, it is characterized in that, including high-voltage impulse protection circuit, rectification circuit, bleeder circuit and mu balanced circuit, described high-voltage impulse protection circuit is in parallel with rectification circuit, described rectification circuit is connected with bleeder circuit, described bleeder circuit is in parallel with mu balanced circuit, wherein, described high-voltage impulse protection circuit is in series by several critesistor and several varistors, by increasing the electric current flowing through critesistor, to increase the resistance of critesistor, improve the high pressure resistant pulse ability of regulated power supply；Described rectification circuit is formed by several Diode series；Described bleeder circuit is made up of several high pressure field effect transistor and several first resistance, makes the grid of each high pressure field effect transistor, drain electrode and source electrode obtain uniform dividing potential drop；Described mu balanced circuit is made up of with Zener diode audion, the second resistance, and this audion and the second resistance form constant-current source, this constant-current source and Zener diode composition source of stable pressure.
As a further improvement on the present invention, current foldback circuit and current monitoring circuit are also included.
As a further improvement on the present invention; described high-voltage impulse protection circuit is in series by two critesistor and a varistor; described rectification circuit is formed by eight Diode series, and described bleeder circuit is made up of three high pressure field effect transistor and six the first resistance；nullDescribed high-voltage impulse protection circuit includes critesistor PTC1、Critesistor PTC2 and varistor CNR2，Described rectification circuit includes diode D1、Diode D2、Diode D3、Diode D4、Diode D5、Diode D6、Diode D7 and diode D8，Described bleeder circuit includes high pressure field effect transistor Q1、High pressure field effect transistor Q2、High pressure field effect transistor Q3、First resistance R1、First resistance R2、First resistance R3、First resistance R4、First resistance R5 and the first resistance R6，Described mu balanced circuit includes audion Q4、Second resistance R7 and Zener diode ZD1，Wherein，Described critesistor PTC1 connects with critesistor PTC2，It is respectively connecting to varistor CNR2 one end again、Diode D1 negative pole and diode D8 positive pole，This varistor CNR2 other end is respectively connecting to diode D2 negative pole and diode D6 positive pole；Described diode D1 positive pole is connected to diode D4 negative pole, this diode D4 positive pole is respectively connecting to diode D5 positive pole and ground end, this diode D5 negative pole is connected to diode D2 positive pole, described diode D8 negative pole is connected to diode D7 positive pole, this diode D7 negative pole is respectively connecting to the drain electrode of diode D3 negative pole, first resistance R1 one end and high pressure field effect transistor Q1, and this diode D3 positive pole is connected to diode D6 negative pole；nullThe described first resistance R1 other end and first resistance R2 one end connect，This first resistance R2 other end is respectively connecting to grid and first resistance R3 one end of high pressure field effect transistor Q1，This first resistance R3 other end is connected to first resistance R4 one end，This first resistance R4 other end is respectively connecting to grid and first resistance R5 one end of high pressure field effect transistor Q2，This first resistance R5 other end is connected to first resistance R6 one end，This first resistance R6 other end is respectively connecting to the grid of high pressure field effect transistor Q3、The colelctor electrode of audion Q4 and one second electric capacity C1 positive pole，This second electric capacity C1 minus earth end，The source electrode of this high pressure field effect transistor Q1 is connected with the drain electrode of high pressure field effect transistor Q2，The source electrode of this high pressure field effect transistor Q2 is connected with the drain electrode of high pressure field effect transistor Q3，The source electrode of this high pressure field effect transistor Q3 is respectively connecting to base stage and second resistance R7 one end of audion Q4；The emitting stage of this audion Q4 is respectively connecting to the second resistance R7 other end, Zener diode ZD1 negative pole and one the 3rd electric capacity C2 positive pole, and this Zener diode ZD1 positive pole is respectively connecting to the 3rd electric capacity C2 negative pole and ground end.
The invention have the benefit that and increase high-voltage impulse protection circuit by the input at regulated power supply, the circuit of whole regulated power supply is protected, make regulated power supply to impact by anti-high-voltage pulse；By the rectification circuit that multiple Diode series form, improve the voltage endurance capability of whole regulated power supply；Zener diode is coordinated, it is achieved super wide voltage input turns the purpose of voltage stabilizing output by the high pressure field effect transistor concatenated flexibly；The PN junction adopting audion regulates, it is achieved current limliting exports；By the appropriate design to whole circuit, it is achieved anti-high-voltage pulse (thunderbolt) impacts, can input by super wide voltage, and the input range of voltage can be adjusted as required flexibly, to obtain the effect of the flow-limiting voltage-stabilizing of low pressure.
Above-mentioned is the general introduction of inventive technique scheme, and below in conjunction with accompanying drawing and detailed description of the invention, the present invention will be further described.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of voltage-stabilized power supply circuit of the present invention；
Fig. 2 is the circuit diagram of regulated power supply of the present invention；
Fig. 3 is the circuit diagram of current foldback circuit of the present invention；
Fig. 4 is the circuit diagram of current monitoring circuit of the present invention.
Detailed description of the invention
For further setting forth that the present invention reaches technological means and effect that predetermined purpose is taked, below in conjunction with accompanying drawing and preferred embodiment, the specific embodiment of the present invention is described in detail.
Embodiment one:
Refer to Fig. 1 and Fig. 2, the present embodiment provide a kind of anti-lightning can the flow-limiting voltage-stabilizing method of regulated power supply of super wide voltage input, comprise the following steps:
(1) arranging a regulated power supply, this regulated power supply includes high-voltage impulse protection circuit, rectification circuit, bleeder circuit and mu balanced circuit, and wherein, described high-voltage impulse protection circuit is in series by several critesistor and several varistors；Described rectification circuit is formed by several Diode series；Described bleeder circuit is made up of several high pressure field effect transistor and several first resistance；Described mu balanced circuit is made up of with Zener diode audion, the second resistance；
(2) conducting voltage of varistor in preset high-pressure pulse protection circuit; when the input terminal voltage of high-voltage impulse protection circuit is higher than the conducting voltage of varistor; varistor turns on; the electric current flowing through critesistor increases; thus increasing the resistance of critesistor, then whole voltage-stabilized power supply circuit is protected；
(3) in described rectification circuit, the electric current of several diode pair high-voltage impulse protection circuit outfans of series connection carries out rectification, and alternating current is converted to unidirectional current；
(4) several high pressure field effect transistor in described bleeder circuit are connected in series, several first resistant series are formed series arm simultaneously, and the grid of each high pressure field effect transistor is connected in series arm, the voltage of rectification circuit output end is carried out dividing potential drop, make the grid even voltage of each high pressure field effect transistor, and the drain electrode of each high pressure field effect transistor and source electrode even voltage；
(5) audion in described mu balanced circuit and the second resistance composition constant-current source, the electric current flowing through mu balanced circuit is dynamically regulated, make constant current hold, this constant-current source and Zener diode composition source of stable pressure, when the electric current flowing through the second resistance increases, the conducting degree of audion strengthens, and then drags down the grid voltage of each high pressure field effect transistor, so that the conducting degree of each high pressure field effect transistor reduces and dividing potential drop increase, reach the purpose of flow-limiting voltage-stabilizing.
In the present embodiment, in described step (1), the resistance of several the first resistance described is all identical；In described step (5), the electric current I=0.6/ (resistance value of the second resistance) of the constant-current source of described audion and the second resistance composition.
The present embodiment additionally provide implement said method can super wide voltage input current-limiting voltage-stabilizing power source, it includes high-voltage impulse protection circuit, rectification circuit, bleeder circuit and mu balanced circuit, described high-voltage impulse protection circuit is in parallel with rectification circuit, described rectification circuit is connected with bleeder circuit, described bleeder circuit is in parallel with mu balanced circuit, wherein, described high-voltage impulse protection circuit is in series by several critesistor and several varistors, by increasing the electric current flowing through critesistor, to increase the resistance of critesistor, improve the high pressure resistant pulse ability of regulated power supply；Described rectification circuit is formed by several Diode series；Described bleeder circuit is made up of several high pressure field effect transistor and several first resistance, makes the grid of each high pressure field effect transistor, drain electrode and source electrode obtain uniform dividing potential drop；Described mu balanced circuit is made up of with Zener diode audion, the second resistance, and this audion and the second resistance form constant-current source, this constant-current source and Zener diode composition source of stable pressure.
In the present embodiment, described high-voltage impulse protection circuit is in series by two critesistor and a varistor, and described rectification circuit is formed by eight Diode series, and described bleeder circuit is made up of three high pressure field effect transistor and six the first resistance.
In described high-voltage impulse protection circuit; mode by two critesistor series connection; whole regulated power supply is enable to bear higher high-voltage pulse; when input voltage is higher than the conducting voltage of varistor; this varistor turns on; the loop current of two critesistor increases, thus increasing its resistance, thus rectification circuit, bleeder circuit and mu balanced circuit are protected.In described rectification circuit, the effect of rectification is played in the series connection of eight diodes, makes whole regulated power supply have higher voltage endurance capability simultaneously.In described bleeder circuit, adopt three high pressure field effect transistor series connection dividing potential drops, the identical uniform dividing potential drop of grid making three high pressure field effect transistor of the value of six the first resistance, so that the drain electrode of three high pressure field effect transistor and source electrode also uniform dividing potential drop, simultaneously, use due to high pressure field effect transistor so that six the first resistance can choose bigger resistance, and has taken into account higher and relatively low input voltage.In described mu balanced circuit, audion and the second resistance composition constant-current source, and its electric current I=0.6/ (resistance value of the second resistance), this constant-current source and Zener diode composition source of stable pressure, when the electric current flowing through the second resistance increases, triode ON degree strengthens, and then drags down the grid voltage of three high-voltage field effects, three high-voltage field effect conducting degree reduce and dividing potential drop increase, thus realizing the purpose of flow-limiting voltage-stabilizing.
nullAs shown in Figure 2，As a kind of specific embodiment，Described high-voltage impulse protection circuit includes critesistor PTC1、Critesistor PTC2 and varistor CNR2，Described rectification circuit includes diode D1、Diode D2、Diode D3、Diode D4、Diode D5、Diode D6、Diode D7 and diode D8，Described bleeder circuit includes high pressure field effect transistor Q1、High pressure field effect transistor Q2、High pressure field effect transistor Q3、First resistance R1、First resistance R2、First resistance R3、First resistance R4、First resistance R5 and the first resistance R6，Described mu balanced circuit includes audion Q4、Second resistance R7 and Zener diode ZD1，Wherein，Described critesistor PTC1 connects with critesistor PTC2，It is respectively connecting to varistor CNR2 one end again、Diode D1 negative pole and diode D8 positive pole，This varistor CNR2 other end is respectively connecting to diode D2 negative pole and diode D6 positive pole；Described diode D1 positive pole is connected to diode D4 negative pole, this diode D4 positive pole is respectively connecting to diode D5 positive pole and ground end, this diode D5 negative pole is connected to diode D2 positive pole, described diode D8 negative pole is connected to diode D7 positive pole, this diode D7 negative pole is respectively connecting to the drain electrode of diode D3 negative pole, first resistance R1 one end and high pressure field effect transistor Q1, and this diode D3 positive pole is connected to diode D6 negative pole；nullThe described first resistance R1 other end and first resistance R2 one end connect，This first resistance R2 other end is respectively connecting to grid and first resistance R3 one end of high pressure field effect transistor Q1，This first resistance R3 other end is connected to first resistance R4 one end，This first resistance R4 other end is respectively connecting to grid and first resistance R5 one end of high pressure field effect transistor Q2，This first resistance R5 other end is connected to first resistance R6 one end，This first resistance R6 other end is respectively connecting to the grid of high pressure field effect transistor Q3、The colelctor electrode of audion Q4 and one second electric capacity C1 positive pole，This second electric capacity C1 minus earth end，The source electrode of this high pressure field effect transistor Q1 is connected with the drain electrode of high pressure field effect transistor Q2，The source electrode of this high pressure field effect transistor Q2 is connected with the drain electrode of high pressure field effect transistor Q3，The source electrode of this high pressure field effect transistor Q3 is respectively connecting to base stage and second resistance R7 one end of audion Q4；The emitting stage of this audion Q4 is respectively connecting to the second resistance R7 other end, Zener diode ZD1 negative pole and one the 3rd electric capacity C2 positive pole, and this Zener diode ZD1 positive pole is respectively connecting to the 3rd electric capacity C2 negative pole and ground end.
Meanwhile, in the present embodiment, the input of current-limiting voltage-stabilizing power source can input 12-1000VDC/AC voltage, and its outfan may be connected directly to measure or other devices.Certainly, can pass through to change the series connection progression of high-voltage impulse protection circuit and parameter, bear the size of pulse voltage changing regulated power supply；Needs according to input voltage range, the progression that can increase or reduce high pressure field effect transistor flexibly achieves the goal；Meanwhile, the numerical value of current limliting and voltage stabilizing can be changed by adjusting the parameter of the second resistance and Zener diode.
Embodiment two:
Refer to Fig. 3; the present embodiment differs primarily in that with enforcement one; further comprise the steps of: (6) gate series one current foldback circuit in each high pressure field effect transistor; when outer load charging current is excessive; voltage is added to the grid of high pressure field effect transistor by current foldback circuit after postponing a period of time, to avoid bleeder circuit to produce parasitic pressure drop.Current foldback circuit in described step (6) is the delay circuit being made up of the 3rd resistance R8 and the first electric capacity C.Described regulated power supply also includes current foldback circuit.
The function of whole regulated power supply is played important important by the high pressure field effect transistor in the present invention; therefore; the long-term of high pressure field effect transistor keeps its original performance most important; but; in actual application, damage owing to overload can cause that high pressure field effect transistor PN junction temperature is too high, because beyond the limiting voltage of the actual permission of high pressure field effect transistor, voltage causes that PN junction punctures damage; accordingly, it would be desirable to high pressure field effect transistor is taked protective measure.The present embodiment is by increasing by a delay circuit at the grid of each high pressure field effect transistor, to avoid external load moment that switches on power to make parasitic pressure drop produced by power circuit owing to being loaded with bigger charging current, and cause high pressure field effect transistor puncture damage.High pressure field effect transistor is played a very good protection, it is ensured that the high-voltage field effect pipe range phase keeps its original performance.
Embodiment three:
Refer to Fig. 4, the present embodiment differs primarily in that with enforcement one, further comprising the steps of: (7) connect a current monitoring circuit at the outfan of mu balanced circuit, this current monitoring circuit is composed in parallel with current parallel monitor chip by the 4th resistance R9, this current parallel monitor chip changes into electric current by flowing through the 4th resistance R9 voltage drop produced, and converts the current to voltage signal.Described regulated power supply also includes current monitoring circuit.
Described step (7) specifically includes following steps:
(7.1) operational amplifier L, NPN transistor Q5, the 5th resistance R10, the 6th resistance R11 and audion Q6 are set at the internal circuit of current parallel monitor chip, wherein, the in-phase input end of this operational amplifier L is connected to the 5th resistance R10 one end, reverse input end is connected to the 6th resistance R11 one end, outfan is connected with the base stage of NPN transistor Q5, the colelctor electrode of this NPN transistor Q5 is connected to the other end of the 5th resistance R10, and the emitter stage of this NPN transistor Q5 connects an outer meeting resistance RL；
(7.2) when described circuit output end of pressure-stabilizing electric current flows through the 4th resistance R9, produce a voltage drop, when on the 5th resistance R10 that voltage drop is applied to current parallel monitor chip internal, the internal circuit of this current parallel monitor chip enters the colelctor electrode of NPN transistor Q5, outer meeting resistance R by producing an electric currentLOutput electric current is changed into voltage signal.
Other steps are identical with embodiment one, do not repeat them here.
Along with improving constantly of chip integration and wiring density, regulated power supply for electronic product can produce the faults such as open circuit, short circuit, electric leakage, therefore applying before this regulated power supply, it is necessary to the outfan of voltage-stabilized power supply circuit is carried out the detection of power supply, to guarantee whole power circuit normal operation.The present embodiment is connected a current monitoring circuit at the outfan of mu balanced circuit, in order to reduce the impact on tested electric current of the measuring circuit of voltage-stabilized power supply circuit outfan, the present embodiment adopts current parallel monitor chip measuring circuit (the 4th resistance) to be exported as electric current, voltage signal is converted the current to, to realize the monitoring to voltage-stabilized power supply circuit output end current again through outer meeting resistance.
The emphasis of the present invention essentially consists in, and increases high-voltage impulse protection circuit by the input at regulated power supply, the circuit of whole regulated power supply is protected, and makes regulated power supply to impact by anti-high-voltage pulse；By the rectification circuit that multiple Diode series form, improve the voltage endurance capability of whole regulated power supply；Zener diode is coordinated, it is achieved super wide voltage input turns the purpose of voltage stabilizing output by the high pressure field effect transistor concatenated flexibly；The PN junction adopting audion regulates, it is achieved current limliting exports；Appropriate design by whole circuit, it is achieved anti-high-voltage pulse (thunderbolt) impacts, can input by super wide voltage, and can adjust the input range of voltage as required flexibly, to obtain the effect of the flow-limiting voltage-stabilizing of low pressure.
The above, be only presently preferred embodiments of the present invention, not the technical scope of the present invention is imposed any restrictions, therefore adopts the technical characteristic identical or approximate with the above embodiment of the present invention, all within protection scope of the present invention.
Claims (10)
1. an anti-lightning can the flow-limiting voltage-stabilizing method of regulated power supply of super wide voltage input, it is characterised in that comprise the following steps:
(1) arranging a regulated power supply, this regulated power supply includes high-voltage impulse protection circuit, rectification circuit, bleeder circuit and mu balanced circuit, and wherein, described high-voltage impulse protection circuit is in series by several critesistor and several varistors；Described rectification circuit is formed by several Diode series；Described bleeder circuit is made up of several high pressure field effect transistor and several first resistance；Described mu balanced circuit is made up of with Zener diode audion, the second resistance；
(2) conducting voltage of varistor in preset high-pressure pulse protection circuit; when the input terminal voltage of high-voltage impulse protection circuit is higher than the conducting voltage of varistor; varistor turns on; the electric current flowing through critesistor increases; thus increasing the resistance of critesistor, then whole voltage-stabilized power supply circuit is protected；
(3) in described rectification circuit, the electric current of several diode pair high-voltage impulse protection circuit outfans of series connection carries out rectification, and alternating current is converted to unidirectional current；
(4) several high pressure field effect transistor in described bleeder circuit are connected in series, several first resistant series are formed series arm simultaneously, and the grid of each high pressure field effect transistor is connected in series arm, the voltage of rectification circuit output end is carried out dividing potential drop, make the grid even voltage of each high pressure field effect transistor, and the drain electrode of each high pressure field effect transistor and source electrode even voltage；
(5) audion in described mu balanced circuit and the second resistance composition constant-current source, the electric current flowing through mu balanced circuit is dynamically regulated, make constant current hold, this constant-current source and Zener diode composition source of stable pressure, when the electric current flowing through the second resistance increases, the conducting degree of audion strengthens, and then drags down the grid voltage of each high pressure field effect transistor, so that the conducting degree of each high pressure field effect transistor reduces and dividing potential drop increase, reach the purpose of flow-limiting voltage-stabilizing.
2. anti-lightning according to claim 1 can the flow-limiting voltage-stabilizing method of regulated power supply of super wide voltage input, it is characterised in that in described step (1), the resistance of several the first resistance described is all identical.
3. anti-lightning according to claim 1 can the flow-limiting voltage-stabilizing method of regulated power supply of super wide voltage input, it is characterized in that, in described step (5), the resistance value of electric current I=0.6/ second resistance of the constant-current source of described audion and the second resistance composition.
4. anti-lightning according to claim 1 can the flow-limiting voltage-stabilizing method of regulated power supply of super wide voltage input; it is characterized in that; further comprising the steps of: (6) are at gate series one current foldback circuit of each high pressure field effect transistor; when outer load charging current is excessive; voltage is added to the grid of high pressure field effect transistor by current foldback circuit after postponing a period of time, to avoid bleeder circuit to produce parasitic pressure drop.
5. anti-lightning according to claim 4 can the flow-limiting voltage-stabilizing method of regulated power supply of super wide voltage input, it is characterised in that the current foldback circuit in described step (6) is the delay circuit being made up of the 3rd resistance and the first electric capacity.
6. anti-lightning according to claim 1 can the flow-limiting voltage-stabilizing method of regulated power supply of super wide voltage input, it is characterized in that, further comprising the steps of: (7) connect a current monitoring circuit at the outfan of mu balanced circuit, this current monitoring circuit is composed in parallel by the 4th resistance and current parallel monitor chip, the voltage drop flowing through the 4th resistance generation is changed into electric current by this current parallel monitor chip, and converts the current to voltage signal.
7. anti-lightning according to claim 6 can the flow-limiting voltage-stabilizing method of regulated power supply of super wide voltage input, it is characterised in that described step (7) specifically includes following steps:
(7.1) operational amplifier, NPN transistor, the 5th resistance, the 6th resistance and audion are set at the internal circuit of current parallel monitor chip, wherein, the in-phase input end of this operational amplifier is connected to the 5th resistance one end, reverse input end is connected to the 6th resistance one end, outfan is connected with the base stage of NPN transistor, the colelctor electrode of this NPN transistor is connected to the other end of the 5th resistance, and the emitter stage of this NPN transistor connects an outer meeting resistance；
(7.2) when described circuit output end of pressure-stabilizing electric current flows through four resistance, produce a voltage drop, when on the 5th resistance that voltage drop is applied to current parallel monitor chip internal, the internal circuit of this current parallel monitor chip enters the colelctor electrode of NPN transistor by producing an electric current, and output electric current is changed into voltage signal by outer meeting resistance.
8. one kind implement the described method of one of claim 1-7 can super wide voltage input current-limiting voltage-stabilizing power source; it is characterized in that; including high-voltage impulse protection circuit, rectification circuit, bleeder circuit and mu balanced circuit; described high-voltage impulse protection circuit is in parallel with rectification circuit; described rectification circuit is connected with bleeder circuit, and described bleeder circuit is in parallel with mu balanced circuit；
Wherein, described high-voltage impulse protection circuit is in series by several critesistor and several varistors, by increasing the electric current flowing through critesistor, to increase the resistance of critesistor, improves the high pressure resistant pulse ability of regulated power supply；Described rectification circuit is formed by several Diode series；Described bleeder circuit is made up of several high pressure field effect transistor and several first resistance, makes the grid of each high pressure field effect transistor, drain electrode and source electrode obtain uniform dividing potential drop；Described mu balanced circuit is made up of with Zener diode audion, the second resistance, and this audion and the second resistance form constant-current source, this constant-current source and Zener diode composition source of stable pressure.
9. according to claim 8 can super wide voltage input current-limiting voltage-stabilizing power source, it is characterised in that also include current foldback circuit and current monitoring circuit.
10. according to claim 8 can super wide voltage input current-limiting voltage-stabilizing power source; it is characterized in that; described high-voltage impulse protection circuit is in series by two critesistor and a varistor; described rectification circuit is formed by eight Diode series, and described bleeder circuit is made up of three high pressure field effect transistor and six the first resistance；nullDescribed high-voltage impulse protection circuit includes critesistor PTC1、Critesistor PTC2 and varistor CNR2，Described rectification circuit includes diode D1、Diode D2、Diode D3、Diode D4、Diode D5、Diode D6、Diode D7 and diode D8，Described bleeder circuit includes high pressure field effect transistor Q1、High pressure field effect transistor Q2、High pressure field effect transistor Q3、First resistance R1、First resistance R2、First resistance R3、First resistance R4、First resistance R5 and the first resistance R6，Described mu balanced circuit includes audion Q4、Second resistance R7 and Zener diode ZD1，Wherein，Described critesistor PTC1 connects with critesistor PTC2，It is respectively connecting to varistor CNR2 one end again、Diode D1 negative pole and diode D8 positive pole，This varistor CNR2 other end is respectively connecting to diode D2 negative pole and diode D6 positive pole；Described diode D1 positive pole is connected to diode D4 negative pole, this diode D4 positive pole is respectively connecting to diode D5 positive pole and ground end, this diode D5 negative pole is connected to diode D2 positive pole, described diode D8 negative pole is connected to diode D7 positive pole, this diode D7 negative pole is respectively connecting to the drain electrode of diode D3 negative pole, first resistance R1 one end and high pressure field effect transistor Q1, and this diode D3 positive pole is connected to diode D6 negative pole；nullThe described first resistance R1 other end and first resistance R2 one end connect，This first resistance R2 other end is respectively connecting to grid and first resistance R3 one end of high pressure field effect transistor Q1，This first resistance R3 other end is connected to first resistance R4 one end，This first resistance R4 other end is respectively connecting to grid and first resistance R5 one end of high pressure field effect transistor Q2，This first resistance R5 other end is connected to first resistance R6 one end，This first resistance R6 other end is respectively connecting to the grid of high pressure field effect transistor Q3、The colelctor electrode of audion Q4 and one second electric capacity C1 positive pole，This second electric capacity C1 minus earth end，The source electrode of this high pressure field effect transistor Q1 is connected with the drain electrode of high pressure field effect transistor Q2，The source electrode of this high pressure field effect transistor Q2 is connected with the drain electrode of high pressure field effect transistor Q3，The source electrode of this high pressure field effect transistor Q3 is respectively connecting to base stage and second resistance R7 one end of audion Q4；The emitting stage of this audion Q4 is respectively connecting to the second resistance R7 other end, Zener diode ZD1 negative pole and one the 3rd electric capacity C2 positive pole, and this Zener diode ZD1 positive pole is respectively connecting to the 3rd electric capacity C2 negative pole and ground end.
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