CN105811750B - A kind of anti-lightning can super wide voltage input regulated power supply and its flow-limiting voltage-stabilizing method - Google Patents
A kind of anti-lightning can super wide voltage input regulated power supply and its flow-limiting voltage-stabilizing method Download PDFInfo
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- CN105811750B CN105811750B CN201610263975.2A CN201610263975A CN105811750B CN 105811750 B CN105811750 B CN 105811750B CN 201610263975 A CN201610263975 A CN 201610263975A CN 105811750 B CN105811750 B CN 105811750B
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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 kind of anti-lightning can super wide voltage input regulated power supply flow-limiting voltage-stabilizing method; the following steps are included: a regulated power supply is arranged in (1), which includes high-voltage impulse protection circuit, rectification circuit, bleeder circuit and voltage regulator circuit；(2) conducting voltage for presetting varistor, when input terminal voltage is higher than conducting voltage, varistor conducting, the electric current for flowing through thermistor increases, and increases the resistance value of thermistor, protects to entire voltage-stabilized power supply circuit；(3) rectification circuit converts alternating current to direct current；(4) bleeder circuit divides the voltage of rectification circuit output end；(5) electric current is adjusted in voltage regulator circuit, achievees the purpose that flow-limiting voltage-stabilizing.The invention also discloses anti-lightning can super wide voltage input regulated power supply.Regulated power supply of the present invention can reach the impact of anti-high-voltage pulse, can super wide voltage input effect.
Description
Technical field
The present invention relates to a kind of regulated power supply more particularly to anti-lightning can super wide voltage input regulated power supply and its current limliting
Method for stabilizing voltage.
Background technique
As society burns the wind, electrical equipment is growing day by day.But aging and the lagging in development of electrical power distribution facility, and
It designs the reasons such as bad and electricity shortage and causes the too low of terminal temperature difference voltage, and then frequent voltage is higher by the end of a thread user.To with
Electric equipment especially requires voltage stringent high and new technology and precision equipment, like not insuring.Unstable voltage meeting
Mortal injury or malfunction are caused to equipment, influences to produce, causes many-sided loss such as delivery date delay, unstable quality.Together
When acceleration equipment aging, influence service life and even burn accessory, so that owner is faced the puzzlement to need repairing or in a short time
Will more new equipment, waste of resource；Even safety accident occurs for serious person, causes immeasurable loss.Therefore, it selects and stablizes electricity
Source can provide stable alternating current or direct current for equipment, guarantee the normal operation of equipment.
However, the regulated power supply that can only provide stable alternating current or direct current is not able to satisfy equipment under all scenario
Demand to voltage.For example, the power supply of alternating current ammeter or other city's power utilization monitoring device circuits, the test pencil without battery or survey ammeter
Deng.For this kind of device due to taking electricity supply measuring circuit to use from measured source, regulated power supply needs to adapt to super wide voltage input
(such as: 12V~1000V), and require to draw measured source electric current very little (such as: European standard≤3mA), while requiring energy
Resist lightning stroke.
However, existing regulated power supply mainly obtains low pressure source by the way of the Switching Power Supply of resistance-capacitance depressurization or complexity, this
Kind of mode can not achieve super wide voltage input, and input voltage range cannot be adjusted flexibly, at the same cannot bear 8000V with
The impact of upper pulse voltage.
Therefore, develop one kind can the impact of anti-high-voltage pulse, can super wide voltage input, and electricity can be adjusted flexibly as needed
The input range of pressure is to obtain the current-limiting voltage-stabilizing power source and its flow-limiting voltage-stabilizing method of low pressure, it appears more urgent.
Summary of the invention
In view of the above deficiencies, the purpose of the present invention is to provide a kind of anti-lightning can super wide voltage input regulated power supply and
Its flow-limiting voltage-stabilizing method, to solve, existing regulated power supply can not carry out super wide voltage input, input voltage range cannot be adjusted flexibly
It is whole and cannot bear high-voltage pulse impact the problem of.Regulated power supply provided by the invention, the rational design to entire circuit, knot
The flow-limiting voltage-stabilizing method for closing regulated power supply provided by the invention realizes the impact of anti-high-voltage pulse, can super wide voltage input, and can root
According to the input range for needing to be adjusted flexibly voltage, to obtain the effect of the flow-limiting voltage-stabilizing of low pressure.
The technical scheme adopted by the invention to achieve the purpose is as follows:
A kind of anti-lightning can super wide voltage input regulated power supply flow-limiting voltage-stabilizing method, which is characterized in that including following
Step:
(1) be arranged a regulated power supply, the regulated power supply include high-voltage impulse protection circuit, rectification circuit, bleeder circuit with
Voltage regulator circuit, wherein the high-voltage impulse protection circuit is connected in series by several thermistors and several varistors；Institute
Rectification circuit is stated to be formed by several Diode series；The bleeder circuit by several high pressure field-effect tube and several first
Resistance composition；The voltage regulator circuit is made of triode, second resistance and zener diode；
(2) in preset high-pressure pulse protection circuit varistor conducting voltage, when the input of high-voltage impulse protection circuit
When voltage being held to be higher than the conducting voltage of varistor, varistor conducting, the electric current for flowing through thermistor increases, to increase heat
The resistance value of quick resistance then protects entire voltage-stabilized power supply circuit；
(3) electric current of several concatenated diode pair high-voltage impulse protection circuit output ends carries out in the rectification circuit
Rectification, converts alternating current to direct current；
(4) several high pressure field-effect tube in the bleeder circuit are connected in series, while by several first resistors
Series connection forms series arm, and the grid of each high pressure field-effect tube is connected in series arm, to rectification circuit output end
Voltage divided, make the grid even voltage of each high pressure field-effect tube and drain electrode and the source of each high pressure field-effect tube
Pole even voltage；
(5) triode in the voltage regulator circuit and second resistance form constant-current source, will flow through the electric current of voltage regulator circuit into
Mobile state is adjusted, and makes constant current hold, and the constant-current source and zener diode form source of stable pressure, when the electric current for flowing through second resistance
When increase, the conducting degree of triode enhances, and the grid voltage of each high pressure field-effect tube is then dragged down, to make each high pressure
The conducting degree of field-effect tube reduces and divides and increase, and achievees the purpose that flow-limiting voltage-stabilizing.
As a further improvement of the present invention, in the step (1), the resistance value of several first resistors is homogeneous
Together.
As a further improvement of the present invention, in the step (5), the constant current of the triode and second resistance composition
The electric current I=0.6/ (resistance value of second resistance) in source.
As a further improvement of the present invention, further comprising the steps of: the gate series of (6) in each high pressure field-effect tube
Voltage is added to height after current foldback circuit delay a period of time when outer load charging current is excessive by one current foldback circuit
The grid of field-effect tube is pressed, generates parasitic pressure drop to avoid bleeder circuit.
As a further improvement of the present invention, the current foldback circuit in the step (6) is by 3rd resistor and first
The delay circuit of capacitor composition.
As a further improvement of the present invention, further comprising the steps of: output end one electric current of series connection of (7) in voltage regulator circuit
Observation circuit, the current monitoring circuit are composed in parallel by the 4th resistance and current parallel monitor chip, current parallel monitoring
The voltage drop for flowing through the generation of the 4th resistance is converted to electric current by device chip, and converts the current to voltage signal.
As a further improvement of the present invention, the step (7) specifically includes the following steps:
(7.1) current parallel monitor chip internal circuit setting operational amplifier, NPN transistor, the 5th resistance,
6th resistance and triode, wherein the non-inverting input terminal of the operational amplifier is connected to the 5th resistance one end, and reverse input end connects
It is connected to the 6th resistance one end, the base stage connection of output end and NPN transistor, the collector of the NPN transistor is connected to the 5th electricity
The emitter of the other end of resistance, the NPN transistor connects an outer connecting resistance；
(7.2) when the circuit output end of pressure-stabilizing electric current flows through four resistance, a voltage drop is generated, when voltage drop applies
When on to the 5th resistance of current parallel monitor chip interior, the internal circuit of the current parallel monitor chip will generate one
Electric current enters the collector of NPN transistor, and outer connecting resistance is converted to voltage signal for electric current is exported.
It is a kind of implement the above method can super wide voltage input current-limiting voltage-stabilizing power source, which is characterized in that including high-tension pulse
Punching protection circuit, rectification circuit, bleeder circuit and voltage regulator circuit, the high-voltage impulse protection circuit is in parallel with rectification circuit, institute
It states rectification circuit to connect with bleeder circuit, the bleeder circuit is in parallel with voltage regulator circuit, wherein the high-voltage impulse protection circuit
It is connected in series by several thermistors and several varistors, flows through the electric current of thermistor, by increasing to increase heat
The resistance value of quick resistance improves the high pressure resistant pulse ability of regulated power supply；The rectification circuit is formed by several Diode series；
The bleeder circuit is made of several high pressure field-effect tube with several first resistors, makes the grid of each high pressure field-effect tube
Pole, drain electrode and source electrode are uniformly divided；The voltage regulator circuit is made of triode, second resistance and zener diode, this three
Pole pipe and second resistance form constant-current source, and the constant-current source and zener diode form source of stable pressure.
It as a further improvement of the present invention, further include current foldback circuit and current monitoring circuit.
As a further improvement of the present invention, the high-voltage impulse protection circuit is by two thermistors and a pressure-sensitive electricity
Resistance is connected in series, and the rectification circuit is formed by eight Diode series, the bleeder circuit by three high pressure field-effect tube with
Six first resistor compositions；The high-voltage impulse protection circuit includes thermistor PTC1, thermistor PTC2 and varistor
CNR2, the rectification circuit include diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, two
Pole pipe D7 and diode D8, the bleeder circuit includes high pressure field-effect tube Q1, high pressure field-effect tube Q2, high pressure field-effect tube
Q3, first resistor R1, first resistor R2, first resistor R3, first resistor R4, first resistor R5 and first resistor R6 are described steady
Volt circuit includes triode Q4, second resistance R7 and zener diode ZD1, wherein the thermistor PTC1 and thermistor
PTC2 series connection, then it is respectively connected to the one end varistor CNR2, diode D1 cathode and diode D8 anode, the varistor
The CNR2 other end is respectively connected to diode D2 cathode and diode D6 anode；The diode D1 anode is connected to diode D4
Cathode, diode D4 anode is respectively connected to diode D5 anode and ground terminal, diode D5 cathode are connected to diode D2
Anode, the diode D8 cathode are connected to diode D7 anode, diode D7 cathode be respectively connected to diode D3 cathode,
The drain electrode of the one end first resistor R1 and high pressure field-effect tube Q1, diode D3 anode are connected to diode D6 cathode；Described
The one resistance R1 other end is connect with the one end first resistor R2, and the first resistor R2 other end is respectively connected to high pressure field-effect tube Q1
Grid and the one end first resistor R3, the first resistor R3 other end is connected to the one end first resistor R4, and first resistor R4 is another
One end is respectively connected to grid and one end first resistor R5 of high pressure field-effect tube Q2, and the first resistor R5 other end is connected to the
One one end resistance R6, the first resistor R6 other end are respectively connected to the current collection of the grid of high pressure field-effect tube Q3, triode Q4
It is imitated with one second capacitor C1 anode, second capacitor C1 cathode ground terminal, the source electrode and high-voltage field of the high pressure field-effect tube Q1 pole
Should pipe Q2 drain electrode connection, the source electrode of high pressure field-effect tube Q2 connect with the drain electrode of high pressure field-effect tube Q3, which imitates
Should pipe Q3 source electrode be respectively connected to triode Q4 base stage and the one end second resistance R7；The emitting stage of triode Q4 connects respectively
It is connected to the second resistance R7 other end, zener diode ZD1 cathode and a third capacitor C2 anode, zener diode ZD1 anode
It is respectively connected to third capacitor C2 cathode and ground terminal.
The invention has the benefit that increasing high-voltage impulse protection circuit by the input terminal in regulated power supply, to entire
The circuit of regulated power supply is protected, and makes regulated power supply can anti-high-voltage pulse impact；It is made up of multiple Diode series whole
Current circuit improves the voltage endurance capability of entire regulated power supply；Cooperate zener diode by the high pressure field-effect tube flexibly concatenated, it is real
Existing super wide voltage input turns the purpose of pressure stabilizing output；It is adjusted using the PN junction of triode, realizes current limliting output；By to entire electricity
The rational design on road realizes that anti-high-voltage pulse (lightning stroke) is impacted, can super wide voltage input, and voltage can be adjusted flexibly as needed
Input range, to obtain the effect of the flow-limiting voltage-stabilizing of low pressure.
Above-mentioned is the general introduction of inventive technique scheme, below in conjunction with attached drawing and specific embodiment, is done further to the present invention
Explanation.
Detailed description of the invention
Fig. 1 is the structural block diagram 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.
Specific embodiment
Further to illustrate the present invention to reach the technical means and efficacy that predetermined purpose is taken, below in conjunction with attached drawing
And preferred embodiment, detailed description of specific embodiments of the present invention.
Embodiment one:
Please refer to Fig. 1 and Fig. 2, the present embodiment provides a kind of anti-lightning can super wide voltage input regulated power supply current limliting it is steady
Pressure method, comprising the following steps:
(1) be arranged a regulated power supply, the regulated power supply include high-voltage impulse protection circuit, rectification circuit, bleeder circuit with
Voltage regulator circuit, wherein the high-voltage impulse protection circuit is connected in series by several thermistors and several varistors；Institute
Rectification circuit is stated to be formed by several Diode series；The bleeder circuit by several high pressure field-effect tube and several first
Resistance composition；The voltage regulator circuit is made of triode, second resistance and zener diode；
(2) in preset high-pressure pulse protection circuit varistor conducting voltage, when the input of high-voltage impulse protection circuit
When voltage being held to be higher than the conducting voltage of varistor, varistor conducting, the electric current for flowing through thermistor increases, to increase heat
The resistance value of quick resistance then protects entire voltage-stabilized power supply circuit；
(3) electric current of several concatenated diode pair high-voltage impulse protection circuit output ends carries out in the rectification circuit
Rectification, converts alternating current to direct current；
(4) several high pressure field-effect tube in the bleeder circuit are connected in series, while by several first resistors
Series connection forms series arm, and the grid of each high pressure field-effect tube is connected in series arm, to rectification circuit output end
Voltage divided, make the grid even voltage of each high pressure field-effect tube and drain electrode and the source of each high pressure field-effect tube
Pole even voltage；
(5) triode in the voltage regulator circuit and second resistance form constant-current source, will flow through the electric current of voltage regulator circuit into
Mobile state is adjusted, and makes constant current hold, and the constant-current source and zener diode form source of stable pressure, when the electric current for flowing through second resistance
When increase, the conducting degree of triode enhances, and the grid voltage of each high pressure field-effect tube is then dragged down, to make each high pressure
The conducting degree of field-effect tube reduces and divides and increase, and achievees the purpose that flow-limiting voltage-stabilizing.
In the present embodiment, in the step (1), the resistance value of several first resistors is all the same；In the step
Suddenly in (5), the electric current I=0.6/ (resistance value of second resistance) of the constant-current source of the triode and second resistance composition.
The present embodiment additionally provide implement the above method can super wide voltage input current-limiting voltage-stabilizing power source comprising high pressure
Pulse protection circuit, rectification circuit, bleeder circuit and voltage regulator circuit, the high-voltage impulse protection circuit is in parallel with rectification circuit,
The rectification circuit is connected with bleeder circuit, and the bleeder circuit is in parallel with voltage regulator circuit, wherein the high-voltage pulse protection electricity
It routes several thermistors to be connected in series with several varistors, the electric current of thermistor is flowed through by increasing, to increase
The resistance value of thermistor improves the high pressure resistant pulse ability of regulated power supply；The rectification circuit by several Diode series and
At；The bleeder circuit is made of several high pressure field-effect tube with several first resistors, makes each high pressure field-effect tube
Grid, drain electrode and source electrode are uniformly divided；The voltage regulator circuit is made of triode, second resistance and zener diode, should
Triode and second resistance form constant-current source, and the constant-current source and zener diode form source of stable pressure.
In the present embodiment, the high-voltage impulse protection circuit connected by two thermistors with a varistor and
At the rectification circuit is formed by eight Diode series, and the bleeder circuit is by three high pressure field-effect tube and six first
Resistance composition.
In the high-voltage impulse protection circuit, by two concatenated modes of thermistor, enable entire regulated power supply
Higher high-voltage pulse is enough born, when input voltage is higher than the conducting voltage of varistor, varistor conducting, two heat
The loop current of quick resistance increases, to increase its resistance value, to protect to rectification circuit, bleeder circuit and voltage regulator circuit
Shield.In the rectification circuit, rectification is played the role of in the series connection of eight diodes, while it is higher to have entire regulated power supply
Voltage endurance capability.In the bleeder circuit, using three high pressure field-effect tube series connection partial pressures, the value phase of six first resistors
With the grid of three high pressure field-effect tube is divided uniformly, to keep the drain electrode of three high pressure field-effect tube and source electrode also uniform
Partial pressure, simultaneously as the use of high pressure field-effect tube, so that six first resistors can choose biggish resistance value, and takes into account
Higher and lower input voltage.In the voltage regulator circuit, triode and second resistance form constant-current source, and its electric current I=
0.6/ (resistance value of second resistance), the constant-current source and zener diode form source of stable pressure, when the electric current for flowing through second resistance increases
When big, the enhancing of triode ON degree then drags down the grid voltage of three high pressure field-effects, and journey is connected in three high pressure field-effects
Degree reduces and divides and increase, to realize the purpose of flow-limiting voltage-stabilizing.
As shown in Fig. 2, the high-voltage impulse protection circuit includes thermistor as a kind of specific embodiment
PTC1, thermistor PTC2 and varistor CNR2, the rectification circuit include diode D1, diode D2, diode D3, two
Pole pipe D4, diode D5, diode D6, diode D7 and diode D8, the bleeder circuit include high pressure field-effect tube Q1, height
Press field-effect tube Q2, high pressure field-effect tube Q3, first resistor R1, first resistor R2, first resistor R3, first resistor R4, first
Resistance R5 and first resistor R6, the voltage regulator circuit includes triode Q4, second resistance R7 and zener diode ZD1, wherein institute
Thermistor PTC1 is stated to connect with thermistor PTC2, then be respectively connected to the one end varistor CNR2, diode D1 cathode with
Diode D8 anode, the varistor CNR2 other end are respectively connected to diode D2 cathode and diode D6 anode；Described two
Pole pipe D1 anode is connected to diode D4 cathode, and diode D4 anode is respectively connected to diode D5 anode and ground terminal, this two
Pole pipe D5 cathode is connected to diode D2 anode, and the diode D8 cathode is connected to diode D7 anode, and diode D7 is negative
Pole is respectively connected to the drain electrode of diode D3 cathode, the one end first resistor R1 and high pressure field-effect tube Q1, diode D3 anode
It is connected to diode D6 cathode；The first resistor R1 other end is connect with the one end first resistor R2, and first resistor R2 is another
End is respectively connected to grid and one end first resistor R3 of high pressure field-effect tube Q1, and the first resistor R3 other end is connected to first
The one end resistance R4, the first resistor R4 other end are respectively connected to grid and one end first resistor R5 of high pressure field-effect tube Q2,
The first resistor R5 other end is connected to the one end first resistor R6, and the first resistor R6 other end is respectively connected to high pressure field-effect
The grid of pipe Q3, the collector of triode Q4 and one second capacitor C1 anode, second capacitor C1 cathode ground terminal, the high-voltage field
The source electrode of effect pipe Q1 is connect with the drain electrode of high pressure field-effect tube Q2, the source electrode and high pressure field-effect tube of high pressure field-effect tube Q2
The drain electrode of Q3 connects, and the source electrode of high pressure field-effect tube Q3 is respectively connected to base stage and one end second resistance R7 of triode Q4；
The emitting stage of triode Q4 is respectively connected to the second resistance R7 other end, zener diode ZD1 cathode and a third capacitor C2
Anode, zener diode ZD1 anode are respectively connected to third capacitor C2 cathode and ground terminal.
Meanwhile in the present embodiment, the input terminal of current-limiting voltage-stabilizing power source can input 12-1000V DC/AC voltage, output
End may be connected directly to measurement or other devices.Certainly, can by change high-voltage impulse protection circuit series connection series and parameter,
To change the size that regulated power supply bears pulse voltage；According to the needs of input voltage range, high pressure can be flexibly increased or decreased
The series of field-effect tube achieves the goal；Meanwhile current limliting can be changed by adjusting second resistance and the parameter of zener diode
With the numerical value of pressure stabilizing.
Embodiment two:
Referring to figure 3., the present embodiment is with the main distinction for implementing one, further comprises the steps of: (6) and imitates in each high-voltage field
Should pipe one current foldback circuit of gate series, when outer load charging current is excessive, current foldback circuit delay a period of time
Voltage is added to the grid of high pressure field-effect tube afterwards, generates parasitic pressure drop to avoid bleeder circuit.Overcurrent in the step (6)
Protection circuit is the delay circuit being made of 3rd resistor R8 and first capacitor C.The regulated power supply further includes overcurrent protection electricity
Road.
High pressure field-effect tube in the present invention function of entire regulated power supply is played it is important important, it is therefore, high
Press its original performance of the holding for a long time of field-effect tube most important, however, in actual application, since overload will lead to high pressure
Field-effect tube PN junction temperature is excessively high and damages, since voltage leads to PN beyond the practical limiting voltage allowed of high pressure field-effect tube
Junction breakdown damage, therefore, it is necessary to take safeguard measure to high pressure field-effect tube.The present embodiment passes through in each high pressure field-effect tube
Grid increase a delay circuit, to avoid external load power on moment due to load there is biggish charging current to make power supply
Parasitic pressure drop caused by circuit, and the breakdown of high pressure field-effect tube is caused to be damaged.Good guarantor is played to high pressure field-effect tube
Shield effect guarantees that the high pressure field-effect pipe range phase keeps its original performance.
Embodiment three:
Referring to figure 4., the present embodiment is that further comprising the steps of: (7) are in voltage regulator circuit with the main distinction for implementing one
Output end connect a current monitoring circuit, the current monitoring circuit is in parallel with current parallel monitor chip by the 4th resistance R9
Composition, which is converted to electric current for the voltage drop for flowing through the 4th resistance R9 generation, and electric current is converted
At voltage signal.The regulated power supply further includes current monitoring circuit.
The step (7) specifically includes the following steps:
(7.1) in internal circuit setting operational amplifier L, NPN transistor Q5, the 5th electricity of current parallel monitor chip
Hinder R10, the 6th resistance R11 and triode Q6, wherein the non-inverting input terminal of operational amplifier L is connected to the 5th resistance R10 mono-
End, reverse input end are connected to the 6th one end resistance R11, and output end is connect with the base stage of NPN transistor Q5, the NPN transistor
The collector of Q5 is connected to the other end of the 5th resistance R10, and the emitter of NPN transistor Q5 connects an outer connecting resistance RL；
(7.2) when the circuit output end of pressure-stabilizing electric current flows through the 4th resistance R9, a voltage drop is generated, when voltage drop is applied
When being added on the 5th resistance R10 of current parallel monitor chip interior, the internal circuit of the current parallel monitor chip will
Generate the collector that an electric current enters NPN transistor Q5, outer connecting resistance RLOutput electric current is converted to voltage signal.
Other steps are the same as example 1, and details are not described herein.
With the continuous improvement of chip integration and wiring density, the regulated power supply for electronic product can generate open circuit,
The failures such as short circuit, electric leakage, therefore before the application regulated power supply, need to carry out the output end of voltage-stabilized power supply circuit the inspection of power supply
It surveys, to ensure that entire power circuit works normally.The present embodiment voltage regulator circuit output end connect a current monitoring circuit, be
Influence of the measuring circuit of voltage-stabilized power supply circuit output end to tested electric current is reduced, the present embodiment uses current parallel monitor
Chip exports measuring circuit (the 4th resistance) as electric current, then converts the current to voltage signal by outer connecting resistance, with reality
Now to the monitoring of voltage-stabilized power supply circuit output end current.
Emphasis of the invention essentially consists in, and increases high-voltage impulse protection circuit by the input terminal in regulated power supply, to whole
The circuit of a regulated power supply is protected, and makes regulated power supply can anti-high-voltage pulse impact；It is made up of multiple Diode series
Rectification circuit improves the voltage endurance capability of entire regulated power supply；Cooperate zener diode by the high pressure field-effect tube flexibly concatenated,
Realize that super wide voltage input turns the purpose of pressure stabilizing output；It is adjusted using the PN junction of triode, realizes current limliting output；Pass through entire electricity
The rational design on road realizes that anti-high-voltage pulse (lightning stroke) is impacted, can super wide voltage input, and voltage can be adjusted flexibly as needed
Input range, to obtain the effect of the flow-limiting voltage-stabilizing of low pressure.
The above described is only a preferred embodiment of the present invention, be not intended to limit the scope of the present invention,
Therefore technical characteristic same as or similar to the above embodiments of the present invention is used, it is within the scope of the present invention.
Claims (9)
1. a kind of anti-lightning can super wide voltage input regulated power supply flow-limiting voltage-stabilizing method, which is characterized in that including following step
It is rapid:
(1) regulated power supply is set, which includes high-voltage impulse protection circuit, rectification circuit, bleeder circuit and steady
Volt circuit, wherein the high-voltage impulse protection circuit is connected in series by several thermistors and several varistors；Rectification
The diode rectifier bridge that circuit is made of several diodes；The bleeder circuit by several high pressure field-effect tube with it is several
A first resistor composition；The voltage regulator circuit is made of triode, second resistance and zener diode；
(2) in preset high-pressure pulse protection circuit varistor conducting voltage, when the input terminal of high-voltage impulse protection circuit
When voltage is higher than the conducting voltage of varistor, varistor conducting, the electric current for flowing through thermistor increases, to increase temperature-sensitive
The resistance value of resistance then protects entire voltage-stabilized power supply circuit；
(3) diode rectifier bridge that several diodes form in the rectification circuit is to high-voltage impulse protection circuit output end
Electric current rectified, convert alternating current to direct current；
(4) several high pressure field-effect tube in the bleeder circuit are connected in series, while by several first resistor strings
Connection forms series arm, and the grid of each high pressure field-effect tube is connected in series arm, to rectification circuit output end
Voltage is divided, and keeps the grid voltage of each high pressure field-effect tube uniform and the drain electrode of each high pressure field-effect tube and source electrode
Voltage is uniform；
(5) triode in the voltage regulator circuit and second resistance form constant-current source, and the electric current for flowing through voltage regulator circuit is carried out
Dynamic regulation makes constant current hold, and the constant-current source and zener diode form source of stable pressure, when the electric current for flowing through second resistance increases
When big, the conducting degree of triode enhances, and the grid voltage of each high pressure field-effect tube is then dragged down, to make each high-voltage field
The conducting degree of effect pipe reduces and divides and increase, and achievees the purpose that flow-limiting voltage-stabilizing；
In the step (5), the electric current I=0 .6/ second resistance of the constant-current source of the triode and second resistance composition
Resistance value.
2. anti-lightning according to claim 1 can super wide voltage input regulated power supply flow-limiting voltage-stabilizing method, feature
It is, in the step (1), the resistance value of several first resistors is all the same.
3. anti-lightning according to claim 1 can super wide voltage input regulated power supply flow-limiting voltage-stabilizing method, feature
Be, it is further comprising the steps of: (6) each high pressure field-effect tube one current foldback circuit of gate series, when outer load
When charging current is excessive, voltage is added to the grid of high pressure field-effect tube by current foldback circuit after delay a period of time, to avoid
Bleeder circuit generates parasitic pressure drop.
4. anti-lightning according to claim 3 can super wide voltage input regulated power supply flow-limiting voltage-stabilizing method, feature
It is, the current foldback circuit in the step (6) is the delay circuit being made of 3rd resistor and first capacitor.
5. anti-lightning according to claim 1 can super wide voltage input regulated power supply flow-limiting voltage-stabilizing method, feature
It is, it is further comprising the steps of: output end one current monitoring circuit of series connection of (7) in voltage regulator circuit, the current monitoring circuit
It is composed in parallel by the 4th resistance and current parallel monitor chip, which will flow through the generation of the 4th resistance
Voltage drop be converted to electric current, and convert the current to voltage signal.
6. anti-lightning according to claim 5 can super wide voltage input regulated power supply flow-limiting voltage-stabilizing method, feature
Be, the step (7) specifically includes the following steps:
(7 .1) current parallel monitor chip internal circuit setting operational amplifier, NPN transistor, the 5th resistance with
6th resistance, wherein the non-inverting input terminal of the operational amplifier is connected to the 5th resistance one end, and reverse input end is connected to the 6th
The base stage of resistance one end, output end and NPN transistor connects, and the collector of the NPN transistor is connected to the another of the 5th resistance
The emitter at end, the NPN transistor connects an outer connecting resistance；
(7 .2) generates a voltage drop when the circuit output end of pressure-stabilizing electric current flows through four resistance, when voltage drop applies
When on to the 5th resistance of current parallel monitor chip interior, the internal circuit of the current parallel monitor chip will generate one
Electric current enters the collector of NPN transistor, and outer connecting resistance is converted to voltage signal for electric current is exported.
7. it is a kind of implement one of claim 1-6 the method can super wide voltage input current-limiting voltage-stabilizing power source, feature exists
In, including high-voltage impulse protection circuit, rectification circuit, bleeder circuit and voltage regulator circuit；
Wherein, the high-voltage impulse protection circuit is connected in series by several thermistors and several varistors, passes through increasing
The electric current for flowing through thermistor greatly improves the high pressure resistant pulse ability of regulated power supply to increase the resistance value of thermistor；It is described whole
The diode rectifier bridge that current circuit is made of several diodes；If the bleeder circuit by several high pressure field-effect tube with
Dry first resistor composition, divides grid, drain electrode and the source electrode of each high pressure field-effect tube uniformly；The voltage regulator circuit
It is made of triode, second resistance and zener diode, the triode and second resistance form constant-current source, the constant-current source and pressure stabilizing
Diode forms source of stable pressure.
8. it is according to claim 7 can super wide voltage input current-limiting voltage-stabilizing power source, which is characterized in that further include overcurrent protect
Protection circuit and current monitoring circuit.
9. it is according to claim 7 can super wide voltage input current-limiting voltage-stabilizing power source, which is characterized in that the high-voltage pulse
Protection circuit be connected in series by two thermistors and a varistor, the rectification circuit by eight Diode series and
At the bleeder circuit is made of three high pressure field-effect tube and six first resistors；The high-voltage impulse protection circuit includes
Thermistor PTC1, thermistor PTC2 and varistor CNR2, the rectification circuit include diode D1, diode D2, two
Pole pipe D3, diode D4, diode D5, diode D6, diode D7 and diode D8, the bleeder circuit include high-voltage field effect
It should pipe Q1, high pressure field-effect tube Q2, high pressure field-effect tube Q3, first resistor R1, first resistor R2, first resistor R3, the first electricity
Hindering R4, first resistor R5 and first resistor R6, the voltage regulator circuit includes triode Q4, second resistance R7 and zener diode
ZD1, wherein the thermistor PTC1 connects with thermistor PTC2, then is respectively connected to the one end varistor CNR2, two poles
Pipe D1 cathode and diode D8 anode, the varistor CNR2 other end are being respectively connected to diode D2 cathode and diode D6 just
Pole；The diode D1 anode is connected to diode D4 cathode, diode D4 anode be respectively connected to diode D5 anode with
Ground terminal, diode D5 cathode are connected to diode D2 anode, and the diode D8 cathode is connected to diode D7 anode, this two
Pole pipe D7 cathode is respectively connected to the drain electrode of diode D3 cathode, the one end first resistor R1 and high pressure field-effect tube Q1, two pole
Pipe D3 anode is connected to diode D6 cathode；The first resistor R1 other end is connect with the one end first resistor R2, first electricity
The resistance R2 other end is respectively connected to grid and one end first resistor R3 of high pressure field-effect tube Q1, and the first resistor R3 other end connects
It is connected to the one end first resistor R4, the first resistor R4 other end is respectively connected to the grid and first resistor of high pressure field-effect tube Q2
The one end R5, the first resistor R5 other end are connected to the one end first resistor R6, and the first resistor R6 other end is separately connected supreme
The grid of field-effect tube Q3, the collector of triode Q4 and one second capacitor C1 anode, the second capacitor C1 cathode is pressed to connect
The source electrode of ground terminal, high pressure field-effect tube Q1 is connect with the drain electrode of high pressure field-effect tube Q2, the source electrode of high pressure field-effect tube Q2
It is connect with the drain electrode of high pressure field-effect tube Q3, the source electrode of high pressure field-effect tube Q3 is respectively connected to the base stage of triode Q4 and the
Two one end resistance R7；The emitter of triode Q4 be respectively connected to the second resistance R7 other end, zener diode ZD1 cathode with
One third capacitor C2 anode, zener diode ZD1 anode are respectively connected to third capacitor C2 cathode and ground terminal.
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| CN110825148B (en) | 2019-10-30 | 2021-06-04 | 新鸿电子有限公司 | Constant current control power supply circuit and field emission electron source |
| CN111181372B (en) * | 2020-03-02 | 2021-02-02 | 北京曙光航空电气有限责任公司 | Direct current bus current limiting circuit |
| CN113659556A (en) * | 2021-09-08 | 2021-11-16 | 上海芯圣电子股份有限公司 | High-voltage-resistant protection circuit of chip and high-voltage-resistant chip |
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| EP1052776A2 (en) * | 1999-04-22 | 2000-11-15 | Zhongdu Liu | Solid state electrical switch |
| CN2870262Y (en) * | 2005-08-09 | 2007-02-14 | 刘树林 | High-pressure high-power safety grid of constant power output |
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| KR101001768B1 (en) * | 2008-12-31 | 2010-12-15 | 엘에스산전 주식회사 | Constant voltage circuit |
| CN101572973A (en) * | 2009-04-17 | 2009-11-04 | 上海晶丰明源半导体有限公司 | Circuit and method for improving current precision in LED constant current drive controlled by peak current |
| CN101776931B (en) * | 2009-12-18 | 2013-10-30 | 云南大学 | Low power consumption power supply circuit of meter bus slave computer |
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| EP1052776A2 (en) * | 1999-04-22 | 2000-11-15 | Zhongdu Liu | Solid state electrical switch |
| CN2870262Y (en) * | 2005-08-09 | 2007-02-14 | 刘树林 | High-pressure high-power safety grid of constant power output |
| CN101021719A (en) * | 2006-02-16 | 2007-08-22 | 田家玉 | Electrical measurement-based control switch and switch control socket |
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