CN113741605B - Linear voltage-stabilizing power supply - Google Patents
Linear voltage-stabilizing power supply Download PDFInfo
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- CN113741605B CN113741605B CN202110896823.7A CN202110896823A CN113741605B CN 113741605 B CN113741605 B CN 113741605B CN 202110896823 A CN202110896823 A CN 202110896823A CN 113741605 B CN113741605 B CN 113741605B
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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
- G05F1/561—Voltage to current converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The application discloses linear regulated power supply, linear regulated power supply includes: the input unit is used for inhibiting electromagnetic noise of alternating current input by a power grid and clutter signals with specific frequency; the transformer is electrically connected with the input unit and used for isolating and reducing the alternating current; the rectification filter unit is electrically connected with the transformer and is used for rectifying and filtering the alternating current subjected to isolation and depressurization to output a direct-current positive voltage and a direct-current negative voltage; the output unit is electrically connected to the rectifying and filtering unit and is used for outputting a positive voltage and a negative voltage which can be dynamically adjusted according to the direct-current positive voltage and the direct-current negative voltage, the output voltage ripple is low and the structure is simple, and the requirement of a precise instrument on high-precision voltage is met.
Description
Technical Field
The application relates to the field of power electronic technology application, in particular to a linear stabilized voltage supply.
Background
In the power field, the switching power supply is widely applied to the fields of industrial automation control, military equipment, scientific research equipment, power equipment, medical equipment and the like due to the fact that the switching power supply has high efficiency, light weight and low cost and occupies 75% of the power market, but has large interference, low precision, low ripple in design and production, high precision and high cost, and is slightly shown in the fields of laboratory equipment, audio equipment, precision instrument equipment, charging equipment and the like.
The ripple coefficient of the power supply represents the quality of the power supply, the linear power supply has the main advantages of high stability and small ripple,
the method is suitable for development of precise instruments, hardly involves high-frequency signals, has no interference and noise of a switching power supply, and is widely applied to the fields of audio equipment, precise instrument equipment and the like.
Principle of linear regulated power supply: the power frequency transformer mainly comprises a power frequency transformer, an output rectifying filter, a control circuit, a protection circuit and the like. The linear voltage-stabilized power supply is characterized in that alternating current is transformed by a transformer, and then rectified and filtered by a rectifying circuit to obtain unstable direct current voltage, and to achieve high-precision direct current voltage, the output voltage must be regulated by voltage feedback, so that high stability can be achieved, ripple is very small, and interference and noise of a switching power supply are avoided.
The current circuits of most linear stabilized power supplies are complex, and comprise a dual-input differential circuit, an output circuit, a compensation circuit and other devices, and in order to ensure the normal operation of the linear stabilized power supplies, the conditions of an enabling circuit, initialization and the like are added, so that the linear stabilized power supplies are complicated, the output voltage cannot be adjusted, and the high precision of the voltage requirement of a precision instrument cannot be met.
Content of the application
The technical problem to be solved by the application is that the existing linear voltage stabilizing circuit is complex, the problem of high precision of voltage requirements of precise instruments cannot be met, the linear voltage stabilizing power supply is provided for the defects of the prior art, and the problem that the circuit of the linear voltage stabilizing circuit in the prior art is complex and cannot meet the high precision of the voltage requirements of the precise instruments is solved.
The technical scheme adopted for solving the technical problems is as follows:
a linear regulated power supply comprising:
the input unit is used for inhibiting electromagnetic noise of alternating current input by a power grid and clutter signals with specific frequency;
the transformer is electrically connected with the input unit and used for isolating and reducing the alternating current;
the rectification filter unit is electrically connected with the transformer and is used for rectifying and filtering the alternating current subjected to isolation and depressurization to output a direct-current positive voltage and a direct-current negative voltage;
and the output unit is electrically connected with the rectifying and filtering unit and is used for outputting positive voltage and negative voltage which can be dynamically adjusted according to the direct-current positive voltage and the direct-current negative voltage.
Preferably, the output unit includes:
the positive voltage output unit is electrically connected to the positive output end of the rectifying and filtering unit and is used for outputting a positive voltage which can be dynamically adjusted;
and the negative voltage output unit is electrically connected with the negative output end of the rectifying and filtering unit and is used for outputting a negative voltage which can be dynamically adjusted.
Preferably, the positive voltage output unit includes:
the first power taking unit is electrically connected with the rectifying and filtering unit and is used for converting the direct-current positive voltage into current;
the first current source control unit is electrically connected with the first electricity taking unit and is used for generating driving current according to the current;
the first output subunit is electrically connected with the first current source control unit and is used for outputting positive voltage according to the driving current;
the first reference voltage unit is electrically connected with the first current source control unit and is used for providing a first reference voltage;
and the regulation feedback unit is electrically connected with the first current source control unit and the first output subunit, and is used for feeding back the positive voltage to the first current source control unit and dynamically regulating the positive voltage output by the first output subunit according to the fed-back positive voltage and the first reference voltage.
Preferably, the negative voltage output unit includes:
the second electricity taking unit is electrically connected with the rectifying and filtering unit and is used for converting the direct-current negative voltage into current;
the second current source control unit is electrically connected with the second electricity taking unit and is used for generating driving current according to the current;
the second output subunit is electrically connected with the second current source control unit and is used for driving and outputting negative voltage according to the driving current;
the second reference voltage unit is electrically connected with the second current source control unit and is used for providing a second reference voltage;
the feedback unit is electrically connected with the second current source control unit and is used for feeding back the negative voltage to the second current source control unit; the feedback unit is further used for dynamically adjusting the negative voltage output by the second output subunit according to the fed-back negative voltage and the second reference voltage.
Preferably, the first current source control unit includes:
the emitter of the first triode is electrically connected with the first electricity taking unit;
the base electrode of the second triode is electrically connected with the base electrode of the first triode, the emitting electrode of the second triode is electrically connected with the emitting electrode of the first triode through a first resistor, and the collecting electrode of the second triode is electrically connected with the base electrode of the second triode;
the emitter of the third triode is electrically connected with the emitter of the second triode, the collector of the third triode is electrically connected with the first output subunit, and the base of the third triode is electrically connected with the collector of the first triode;
the collector electrode of the fourth triode is electrically connected with the collector electrode of the first triode, the base electrode of the fourth triode is electrically connected with the first reference voltage unit through a second resistor, and the emitter electrode of the fourth triode is electrically connected with the second current source control unit through a first constant current diode;
and the collector electrode of the fifth triode is electrically connected with the collector electrode of the second triode, the emitter electrode of the fifth triode is electrically connected with the emitter electrode of the fourth triode, and the base electrode of the fifth triode is electrically connected with the regulation feedback unit.
Preferably, the first output subunit includes:
the drain electrode of the first power MOS tube is electrically connected with the rectifying and filtering unit, the grid electrode of the first power MOS tube is electrically connected with the collector electrode of the third triode through the third resistor, and the source electrode of the first power MOS tube outputs the positive voltage;
the anode of the second constant current diode is electrically connected with the collector electrode of the third triode, and the cathode of the second constant current diode is grounded;
the adjustment feedback unit includes:
one end of the fourth resistor is electrically connected with the source electrode of the first power MOS tube through the fifth resistor, and the other end of the fourth resistor is electrically connected with the base electrode of the fifth triode;
and one end of the adjustable resistor is electrically connected with the other end of the fourth resistor, and the other end of the adjustable resistor is grounded.
Preferably, the first triode, the second triode and the third triode form a mirror current source, the fourth triode and the fifth triode form a mirror current source, and currents flowing through the first triode, the second triode and the third triode are equal.
Preferably, the second current source control unit includes:
the emitter of the sixth triode is electrically connected with the second electricity taking unit;
a base electrode of the seventh triode is electrically connected to the base electrode of the sixth triode, an emitter electrode of the seventh triode is electrically connected to the emitter electrode of the sixth triode through a sixth resistor, and a collector electrode of the seventh triode is electrically connected to the base electrode of the seventh triode;
an emitter of the eighth triode is electrically connected to the emitter of the seventh triode, a collector of the eighth triode is electrically connected to the second output subunit, and a base of the eighth triode is electrically connected to the collector of the sixth triode;
a ninth triode, wherein the collector of the ninth triode is electrically connected with the collector of the sixth triode, the base of the ninth triode is electrically connected with the second reference voltage unit, and the emitter of the ninth triode is electrically connected with the first constant current diode;
and the collector electrode of the tenth triode is electrically connected with the collector electrode of the seventh triode, the emitter electrode of the tenth triode is electrically connected with the emitter electrode of the ninth triode, and the base electrode of the tenth triode is electrically connected with the feedback unit.
Preferably, the second output subunit comprises:
the drain electrode of the second power MOS tube is electrically connected with the rectifying and filtering unit, the grid electrode of the second power MOS tube is electrically connected with the collector electrode of the eighth triode through a seventh resistor, and the source electrode of the second power MOS tube outputs the negative voltage;
the cathode of the third constant current diode is electrically connected with the collector electrode of the eighth triode, and the anode of the third constant current diode is grounded;
the feedback unit includes:
one end of the eighth resistor is electrically connected with the source electrode of the second power MOS tube through the ninth resistor, and the other end of the eighth resistor is electrically connected with the base electrode of the thirteenth electrode tube;
and one end of the tenth resistor is electrically connected with the other end of the eighth resistor, and the other end of the tenth resistor is electrically connected with the source electrode of the second power MOS tube.
Preferably, the sixth triode, the seventh triode and the eighth triode form a mirror current source, the ninth triode and the thirteenth triode form a mirror current source, and the currents flowing through the sixth triode, the seventh triode and the eighth triode are equal.
Compared with the prior art, the embodiment of the application has the following main beneficial effects:
the input unit suppresses electromagnetic noise of alternating current input by a power grid and clutter signals with specific frequency, then the alternating current is isolated and reduced through the transformer, then a direct current positive voltage and a direct current negative voltage are output after rectification and filtration through the rectification and filtration unit, and finally the output unit outputs the positive voltage and the negative voltage which can be dynamically adjusted according to the direct current positive voltage and the direct current negative voltage.
Drawings
For a clearer description of the solution of the present application, a brief introduction will be given to the drawings needed in the description of the embodiments, which are some embodiments of the present application, and from which other drawings can be obtained for a person skilled in the art without the inventive effort.
FIG. 1 is a block diagram of one embodiment of a linear voltage regulator of the present application.
Fig. 2 is a schematic block diagram of another embodiment of a linear voltage regulator of the present application.
Fig. 3 is a circuit schematic diagram of an embodiment of a positive voltage output unit of the present application.
Fig. 4 is a circuit schematic diagram of an embodiment of a negative voltage output unit of the present application.
Reference numerals:
1. the power supply comprises a 1 a-linear stabilized power supply, 10 a-input units, 20 a-transformers, 30 a-rectifying and filtering units, 40 a-output units, 401-positive voltage output units, 402-negative voltage output units, 4011-first power taking units, 4012-first current source control units, 4013-first output subunits, 4014-first reference voltage units, 4015-regulation feedback units, 4021-second power taking units, 4022-second current source control units, 4023-second output subunits, 4024-second reference voltage units, 4025-feedback units, Q1-Q10-first triodes to thirteenth triodes, Q11-Q12-triodes, D1-D3-first constant current diodes to third constant current diodes, D4-D5-diodes, R1-R10-first resistors to tenth resistors, R11-R12-resistors, C1-C8-capacitors and Rp-adjustable resistors.
Detailed Description
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the applications herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
Referring to fig. 1, fig. 1 is a schematic block diagram of an embodiment of a linear voltage regulator according to the present invention. In the present embodiment, the linear stabilized power supply 1 includes an input unit 10, a transformer 20, a rectifying and filtering unit 30, and an output unit 40. The input unit 10 is used for suppressing electromagnetic noise of alternating current input by the power grid and clutter signals with specific frequencies, so as to filter interference. In one embodiment of the present invention, the input unit 10 may be composed of a fused socket, a circuit breaker, a single-phase two-stage filter. And a transformer 20 electrically connected to the input unit for isolating and reducing the ac power. In one embodiment of the present invention, the transformer 20 is a toroidal transformer having good output characteristics and anti-interference capability. The user can select the toroidal transformers of different powers according to the requirements to meet the power requirements of the instrument on the power supply. The rectifying and filtering unit 30 is electrically connected to the transformer 20, and is configured to rectify and filter the ac power after the isolated and step-down to output a dc positive voltage and a dc negative voltage. In one embodiment of the present invention, the rectifying and filtering unit 30 may be formed of four schottky diodes to form a bridge rectifying circuit. The output unit 40 includes a positive voltage output unit 401 and a negative voltage output unit 402, and is configured to output a positive voltage and a negative voltage that can be dynamically adjusted according to the dc positive voltage and the dc negative voltage. The positive voltage output unit 401 is electrically connected to the positive output end of the rectifying and filtering unit 30, and is configured to output a positive voltage that can be dynamically adjusted; the negative voltage output unit 402 is electrically connected to the negative output end of the rectifying and filtering unit 30, and is configured to output a dynamically adjustable negative voltage, where the voltage magnitudes of the positive and negative voltages can be synchronously adjusted, and the polarities are opposite.
The linear stabilized voltage supply provided by the invention has the advantages that the input unit suppresses electromagnetic noise of alternating current input by a power grid and clutter signals with specific frequency, then the alternating current is isolated and reduced through the transformer, then the direct current positive voltage and the direct current negative voltage are output after being rectified and filtered through the rectifying and filtering unit, and finally the output unit outputs the positive voltage and the negative voltage which can be dynamically adjusted according to the direct current positive voltage and the direct current negative voltage, so that the requirement of high-precision voltage of a precision instrument is met.
Referring to fig. 2, fig. 2 is a schematic block diagram of another embodiment of the linear voltage-stabilized source of the present invention. In the present embodiment, the linear stabilized power supply 1a includes: input unit 10a, transformer 20a, rectifying and filtering unit 30a, and output unit 40a. The working principles of the input unit 10a, the transformer 20a, and the rectifying and filtering unit 30a in the present embodiment are substantially the same as those of the foregoing embodiments, and are not repeated herein.
In the present embodiment, the output unit 40a includes a positive voltage output unit 401 and a negative voltage output unit 402. The positive voltage output unit 401 is electrically connected to the positive output end of the rectifying and filtering unit 30a, and is configured to output a positive voltage that can be dynamically adjusted. The negative voltage output unit 402 is electrically connected to the negative output terminal of the rectifying and filtering unit 30a, and is configured to output a dynamically adjustable negative voltage.
In the present embodiment, the positive voltage output unit 401 includes a first power supply unit 4011, a first current source control unit 4012, a first output subunit 4013, a first reference voltage unit 4014, and a regulation feedback unit 4015. The first electricity-taking unit 4011 is electrically connected to the rectifying and filtering unit 30a, and is configured to convert the dc positive voltage into a current. The first current source control unit 1012 is electrically connected to the first power supply unit 4011, and is configured to generate a driving current according to the current. The first output subunit 4013 is electrically connected to the first current source control unit 4012, and is configured to output a positive voltage according to the driving current. The first reference voltage unit 4014 is electrically connected to the first current source control unit 4012 and is configured to provide a first reference voltage. The adjusting feedback unit 4015 is electrically connected to the first current source control unit 4012 and the first output subunit 4013, and is configured to feedback the positive voltage to the first current source control unit 4012, and dynamically adjust the positive voltage output by the first output subunit 4013 according to the fed-back positive voltage and the first reference voltage.
In this embodiment, the negative voltage output unit 402 includes a second power taking unit 4021, a second current source control unit 4022, a second output subunit 4023, a second reference voltage unit 4024, and a feedback unit 4025. The second power taking unit 4021 is electrically connected to the rectifying and filtering unit, and is configured to convert the dc negative voltage into current. The second current source control unit 4022 is electrically connected to the second power taking unit 4021, and is configured to generate a driving current according to the current. The second output subunit 4023 is electrically connected to the second current source control unit 4022, and is configured to drive and output a negative voltage according to the driving current. The second reference voltage unit 4024 is electrically connected to the second current source control unit 4022, and is configured to provide a second reference voltage. A feedback unit 4025 electrically connected to the second current source control unit 4022, for feeding back the negative voltage to the second current source control unit 4022. The feedback unit 4025 is further configured to dynamically adjust the negative voltage output by the second output subunit 4023 according to the fed-back negative voltage and the second reference voltage.
The linear stabilized voltage supply provided by the invention dynamically adjusts the voltages of the positive voltage output unit and the negative voltage output unit through the feedback adjusting unit, so that the dynamic positive and negative voltage adjustment is realized.
Referring to fig. 3, fig. 3 is a circuit schematic of an embodiment of the positive voltage output unit of the present invention. In the present embodiment, the positive voltage output unit 401 includes a first power supply unit 4011, a first current source control unit 4012, a first output subunit 4013, a first reference voltage unit 4014, and a regulation feedback unit 4015. Wherein the first current source control unit 4012 includes: the emitter of the first triode Q1 is electrically connected to the first electricity taking unit 4011; the base electrode of the second triode Q2 is electrically connected with the base electrode of the first triode Q1, the emitter electrode of the second triode Q2 is electrically connected with the emitter electrode of the first triode Q1 through a first resistor R1, and the collector electrode of the second triode Q2 is electrically connected with the base electrode of the second triode Q2; the emitter of the third triode Q3 is electrically connected with the emitter of the second triode Q2, the collector of the third triode Q3 is electrically connected with the first output subunit 4013, and the base of the third triode Q3 is electrically connected with the collector of the first triode Q1; a fourth triode Q4, the collector of the fourth triode Q4 is electrically connected to the collector of the first triode Q1, the base of the fourth triode Q4 is electrically connected to the first reference voltage unit 4014 through the second resistor R2, the emitter of the fourth triode Q4 is electrically connected to the second current source control unit 4022 through the first constant current diode D1, wherein the anode of the first constant current diode is electrically connected to the emitter of the fourth triode Q4, and the cathode of the first constant current diode D1 is electrically connected to the second current source control unit 4022; the fifth triode Q5, the collector of the fifth triode Q5 is electrically connected to the collector of the second triode Q2, the emitter of the fifth triode Q5 is electrically connected to the emitter of the fourth triode Q4, and the base of the fifth triode Q5 is electrically connected to the regulating feedback unit 4015.
In the present embodiment, the first output subunit 4013 includes: the drain electrode of the first power MOS tube M1 is electrically connected with the rectifying and filtering unit 30a, the grid electrode of the first power MOS tube M1 is electrically connected with the collector electrode of the third triode Q3 through the third resistor R3, and the source electrode of the first power MOS tube M1 outputs the positive voltage Vout+; and the anode of the second constant current diode D2 is electrically connected with the collector electrode of the third triode Q3, and the cathode of the second constant current diode D is grounded.
In the present embodiment, the feedback adjustment unit 4015 includes: one end of the fourth resistor R4 is electrically connected to the source electrode of the first power MOS tube M1 through a fifth resistor R5, and the other end of the fourth resistor R4 is electrically connected to the base electrode of the fifth triode Q5; one end of the adjustable resistor Rp is electrically connected with the other end of the fourth resistor R4, and the other end of the adjustable resistor Rp is grounded; one end of the capacitor C1 is electrically connected to one end of the fourth resistor R4, and the other end is electrically connected to the other end of the fourth resistor R4.
In the present embodiment, the first power taking unit 4011 includes: a diode D4 having an anode electrically connected to the positive output terminal of the rectifying and filtering unit 30 a; the collector of the triode Q11 is electrically connected with the cathode of the diode D4, the emitter of the triode Q11 is electrically connected with the emitter of the first triode Q1, the base of the triode Q11 is electrically connected with the anode of the capacitor C2 through the resistor R11, and the cathode of the capacitor C2 is grounded; one end of the capacitor C3 is electrically connected with the base electrode of the triode Q11, and the other end of the capacitor C is grounded; and the anode of the capacitor C4 is electrically connected with the emitter of the triode Q11, and the cathode of the capacitor C is grounded.
Specifically, when the rectifying and filtering unit 30a outputs a dc positive voltage, the diode D4 is turned on, and the transistor Q11 is turned on. The first triode Q1, the second triode Q2 and the third triode Q3 form a mirror current source, the fourth triode Q4 and the fifth triode Q5 form a mirror current source, and the symmetrical characteristic of the mirror current source indicates that the currents flowing through the first triode Q1, the second triode Q2 and the third triode Q3 are equal. When the resistance value of the adjustable resistor Rp is adjusted to be smaller, the current flowing through the base electrode of the fifth triode Q5 is increased, the current flowing through the collector electrode of the fifth triode Q5 is also increased, and by the mirror symmetry, the current flowing through the collector electrode of the fourth triode Q4 is increased, so that the current flowing through the base electrode of the third triode Q3 is increased, the current flowing through the collector electrode of the third triode Q3 is correspondingly increased, the current flowing through the second constant current diode D2 is increased, and the driving voltage of the first power MOS transistor M1 is increased, so that the output positive voltage is increased.
Similarly, when the resistance value of the adjustable resistor Rp is adjusted to be greater, the active current of the fifth triode Q5 is reduced, the current flowing through the collector of the fifth triode Q5 is also reduced, the current flowing through the collector of the fourth triode Q4 is reduced, the base current flowing through the third triode Q3 is reduced, the current flowing through the collector of the third triode Q3 is correspondingly reduced, the current flowing through the second constant current diode D2 is reduced, the driving voltage of the first power MOS transistor M1 is reduced, the output positive voltage is reduced, and the dynamic adjustment of the positive voltage is realized.
Referring to fig. 4, fig. 4 is a circuit schematic of an embodiment of the negative voltage output unit of the present invention. The negative voltage output unit 402 includes a second power taking unit 4021, a second current source control unit 4022, a second output subunit 4023, a second reference voltage unit 4024, and a feedback unit 4025. Wherein the second current source control unit includes: a sixth triode Q6, where an emitter of the sixth triode Q6 is electrically connected to the second power-taking unit 4021; a base electrode of the seventh triode Q7 is electrically connected with a base electrode of the sixth triode Q6, an emitter electrode of the seventh triode Q7 is electrically connected with an emitter electrode of the sixth triode Q6 through a sixth resistor R6, and a collector electrode of the seventh triode Q7 is electrically connected with the base electrode of the seventh triode Q7; an eighth triode Q8, the emitter of the eighth triode Q8 is electrically connected with the emitter of the seventh triode Q7, the collector of the eighth triode Q8 is electrically connected with the second output subunit 4023, and the base of the eighth triode Q8 is electrically connected with the collector of the sixth triode Q6; a ninth triode Q9, the collector of the ninth triode Q9 is electrically connected to the collector of the sixth triode Q6, the base of the ninth triode Q9 is electrically connected to the second reference voltage unit 4024, and the emitter of the ninth triode Q9 is electrically connected to the cathode of the first constant current diode D1; the thirteenth transistor Q10, the collector of the tenth transistor Q10 is electrically connected to the collector of the seventh transistor Q7, the emitter of the thirteenth transistor Q10 is electrically connected to the emitter of the ninth transistor Q9, and the base of the thirteenth transistor Q19 is electrically connected to the feedback unit 4025. In this embodiment, the second reference voltage unit 4024 is a base of the ninth transistor Q9 grounded.
In the present embodiment, the second output subunit 4023 includes: the drain electrode of the second power MOS tube M2 is electrically connected with the rectifying and filtering unit 30a, the grid electrode seventh resistor R7 is electrically connected with the collector electrode of the eighth triode Q8, and the source electrode outputs the negative voltage Vout-; and the cathode of the third constant current diode D3 is electrically connected with the collector electrode of the eighth triode Q8, and the anode of the third constant current diode D is grounded.
In the present embodiment, the feedback unit 4025 includes: one end of the eighth resistor R8 is electrically connected to the source electrode of the second power MOS tube M2 through a ninth resistor R9, and the other end of the eighth resistor R8 is electrically connected to the base electrode of the thirteenth pole tube Q10; a tenth resistor R10, one end of which is electrically connected with the other end of the eighth resistor R8, and the source electrode of the first power MOS tube at the other end; one end of the capacitor C5 is electrically connected to one end of the eighth resistor R8, and the other end of the capacitor C5 is electrically connected to the other end of the eighth resistor R8.
In the present embodiment, the second power taking unit 4021 includes: a diode D5 having an anode electrically connected to the negative output terminal of the rectifying and filtering unit 30 a; the collector of the triode Q12 is electrically connected with the cathode of the diode D5, the emitter of the triode Q12 is electrically connected with the emitter of the sixth triode Q6, the base of the triode Q12 is electrically connected with the anode of the capacitor C6 through the resistor R12, and the cathode of the capacitor C6 is grounded; one end of the capacitor C7 is electrically connected with the base electrode of the triode Q12, and the other end of the capacitor C is grounded; and the anode of the capacitor C8 is electrically connected with the emitter of the triode Q12, and the cathode of the capacitor C is grounded.
Specifically, the sixth transistor Q6, the seventh transistor Q7, and the eighth transistor Q8 form a mirror current source, the ninth transistor Q9 and the tenth transistor Q10 form a mirror current source, and the currents flowing through the sixth transistor Q6, the seventh transistor Q7, and the eighth transistor Q8 are equal;
referring to fig. 3, the current collected by the emitters of the fourth transistor Q4 and the fifth transistor Q5 flows into the emitters of the ninth transistor Q9 and the tenth transistor Q10 through the first constant current diode D1. When the resistance value of the adjustable resistor Rp is adjusted to be smaller, the base current of the fifth triode Q5 is increased, the emitter currents of the ninth triode Q9 and the tenth triode Q10 are increased, the collector currents of the sixth triode Q6 and the seventh triode Q7 are correspondingly increased, the currents of the emitter and the collector of the eighth triode Q8 are increased, the voltage of the third constant current diode D3 is increased, the driving voltage of the second power MOS tube is increased, and the output negative voltage is increased.
Similarly, when the resistance value of the adjustable resistor Rp is adjusted to be increased, the base current of the fifth triode Q5 is reduced, and then the emitter currents of the ninth triode Q9 and the tenth triode Q10 are reduced, so that the collector currents of the sixth triode Q6 and the seventh triode Q7 are correspondingly reduced, the currents of the emitter and the collector of the eighth triode Q8 are reduced, and the voltage of the third constant current diode D3 is reduced, so that the driving voltage of the second power MOS transistor is reduced, and the output negative voltage is reduced.
In summary, the application discloses a linear voltage-stabilized power supply, after the electromagnetic noise of alternating current input by a power grid and clutter signals with specific frequency are restrained by an input unit, the alternating current is isolated and reduced by a transformer, then a direct current positive voltage and a direct current negative voltage are output after rectification and filtration by a rectification and filtering unit, finally a positive voltage and a negative voltage which can be dynamically adjusted are output by an output unit according to the direct current positive voltage and the direct current negative voltage, the output voltage ripple is lower and the structure is simple, and the requirement of a precise instrument on high-precision voltage is met.
It is apparent that the embodiments described above are only some embodiments of the present application, but not all embodiments, the preferred embodiments of the present application are given in the drawings, but not limiting the patent scope of the present application. This application may be embodied in many different forms, but rather, embodiments are provided in order to provide a more thorough understanding of the present disclosure. Although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing, or equivalents may be substituted for elements thereof. All equivalent structures made by the specification and the drawings of the application are directly or indirectly applied to other related technical fields, and are also within the protection scope of the application.
Claims (8)
1. A linear regulated power supply, comprising:
the input unit is used for inhibiting electromagnetic noise of alternating current input by a power grid and clutter signals with specific frequency;
the transformer is electrically connected with the input unit and used for isolating and reducing the alternating current;
the rectification filter unit is electrically connected with the transformer and is used for rectifying and filtering the alternating current subjected to isolation and depressurization to output a direct-current positive voltage and a direct-current negative voltage;
the output unit is electrically connected with the rectifying and filtering unit and is used for outputting a positive voltage and a negative voltage which can be dynamically adjusted according to the direct-current positive voltage and the direct-current negative voltage; the output unit includes:
the positive voltage output unit is electrically connected to the positive output end of the rectifying and filtering unit and is used for outputting a positive voltage which can be dynamically adjusted;
the negative voltage output unit is electrically connected with the negative output end of the rectifying and filtering unit and is used for outputting a negative voltage which can be dynamically adjusted; the positive voltage output unit further includes:
the first power taking unit is electrically connected with the rectifying and filtering unit and is used for converting the direct-current positive voltage into current;
the first current source control unit is electrically connected with the first electricity taking unit and is used for generating driving current according to the current;
the first output subunit is electrically connected with the first current source control unit and is used for outputting positive voltage according to the driving current;
the first reference voltage unit is electrically connected with the first current source control unit and is used for providing a first reference voltage;
and the regulation feedback unit is electrically connected with the first current source control unit and the first output subunit, and is used for feeding back the positive voltage to the first current source control unit and dynamically regulating the positive voltage output by the first output subunit according to the fed-back positive voltage and the first reference voltage.
2. The linear stabilized power supply of claim 1, wherein the negative voltage output unit further includes:
the second electricity taking unit is electrically connected with the rectifying and filtering unit and is used for converting the direct-current negative voltage into current;
the second current source control unit is electrically connected with the second electricity taking unit and is used for generating driving current according to the current;
the second output subunit is electrically connected with the second current source control unit and is used for driving and outputting negative voltage according to the driving current;
the second reference voltage unit is electrically connected with the second current source control unit and is used for providing a second reference voltage;
the feedback unit is electrically connected with the second current source control unit and is used for feeding back the negative voltage to the second current source control unit; the feedback unit is further used for dynamically adjusting the negative voltage output by the second output subunit according to the fed-back negative voltage and the second reference voltage.
3. The linear stabilized power supply of claim 2, wherein: the first current source control unit includes:
the emitter of the first triode is electrically connected with the first electricity taking unit;
the base electrode of the second triode is electrically connected with the base electrode of the first triode, the emitting electrode of the second triode is electrically connected with the emitting electrode of the first triode through a first resistor, and the collecting electrode of the second triode is electrically connected with the base electrode of the second triode;
the emitter of the third triode is electrically connected with the emitter of the second triode, the collector of the third triode is electrically connected with the first output subunit, and the base of the third triode is electrically connected with the collector of the first triode;
the collector electrode of the fourth triode is electrically connected with the collector electrode of the first triode, the base electrode of the fourth triode is electrically connected with the first reference voltage unit through a second resistor, and the emitter electrode of the fourth triode is electrically connected with the second current source control unit through a first constant current diode;
and the collector electrode of the fifth triode is electrically connected with the collector electrode of the second triode, the emitter electrode of the fifth triode is electrically connected with the emitter electrode of the fourth triode, and the base electrode of the fifth triode is electrically connected with the regulation feedback unit.
4. A linear stabilized power supply as claimed in claim 3, wherein:
the first output subunit includes:
the drain electrode of the first power MOS tube is electrically connected with the rectifying and filtering unit, the grid electrode of the first power MOS tube is electrically connected with the collector electrode of the third triode through the third resistor, and the source electrode of the first power MOS tube outputs the positive voltage;
the anode of the second constant current diode is electrically connected with the collector electrode of the third triode, and the cathode of the second constant current diode is grounded;
the adjustment feedback unit includes:
one end of the fourth resistor is electrically connected with the source electrode of the first power MOS tube through the fifth resistor, and the other end of the fourth resistor is electrically connected with the base electrode of the fifth triode;
and one end of the adjustable resistor is electrically connected with the other end of the fourth resistor, and the other end of the adjustable resistor is grounded.
5. The linear stabilized power supply of claim 4, wherein:
the first triode, the second triode and the third triode form a mirror current source, the fourth triode and the fifth triode form the mirror current source, and the currents flowing through the first triode, the second triode and the third triode are equal.
6. The linear stabilized power supply of claim 4, wherein the second current source control unit includes:
the emitter of the sixth triode is electrically connected with the second electricity taking unit;
a base electrode of the seventh triode is electrically connected to the base electrode of the sixth triode, an emitter electrode of the seventh triode is electrically connected to the emitter electrode of the sixth triode through a sixth resistor, and a collector electrode of the seventh triode is electrically connected to the base electrode of the seventh triode;
an emitter of the eighth triode is electrically connected to the emitter of the seventh triode, a collector of the eighth triode is electrically connected to the second output subunit, and a base of the eighth triode is electrically connected to the collector of the sixth triode;
a ninth triode, wherein the collector of the ninth triode is electrically connected with the collector of the sixth triode, the base of the ninth triode is electrically connected with the second reference voltage unit, and the emitter of the ninth triode is electrically connected with the first constant current diode;
and the collector electrode of the tenth triode is electrically connected with the collector electrode of the seventh triode, the emitter electrode of the tenth triode is electrically connected with the emitter electrode of the ninth triode, and the base electrode of the tenth triode is electrically connected with the feedback unit.
7. The linear stabilized power supply of claim 6, wherein:
the second output subunit includes:
the drain electrode of the second power MOS tube is electrically connected with the rectifying and filtering unit, the grid electrode of the second power MOS tube is electrically connected with the collector electrode of the eighth triode through a seventh resistor, and the source electrode of the second power MOS tube outputs the negative voltage;
the cathode of the third constant current diode is electrically connected with the collector electrode of the eighth triode, and the anode of the third constant current diode is grounded;
the feedback unit includes:
one end of the eighth resistor is electrically connected with the source electrode of the second power MOS tube through the ninth resistor, and the other end of the eighth resistor is electrically connected with the base electrode of the thirteenth electrode tube;
and one end of the tenth resistor is electrically connected with the other end of the eighth resistor, and the other end of the tenth resistor is electrically connected with the source electrode of the second power MOS tube.
8. The linear stabilized power supply of claim 7, wherein:
the sixth triode, the seventh triode and the eighth triode form a mirror current source, the ninth triode and the thirteenth triode form a mirror current source, and the currents flowing through the sixth triode, the seventh triode and the eighth triode are equal.
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| CN202110896823.7A CN113741605B (en) | 2021-08-05 | 2021-08-05 | Linear voltage-stabilizing power supply |
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| CN202110896823.7A CN113741605B (en) | 2021-08-05 | 2021-08-05 | Linear voltage-stabilizing power supply |
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| DE69530878T2 (en) * | 1994-01-28 | 2003-12-24 | Matsushita Electric Ind Co Ltd | Switching power supply |
| CN103887994A (en) * | 2014-04-09 | 2014-06-25 | 张新安 | Simple and efficient direct-current voltage-stabilized source for laboratory |
| CN205039717U (en) * | 2015-10-28 | 2016-02-17 | 航天长峰朝阳电源有限公司 | Output polarity automatic switching's D.C. regulated power supply |
| CN205160397U (en) * | 2015-11-20 | 2016-04-13 | 航天长峰朝阳电源有限公司 | High -pressure linear stabilized power supply of online integrated integration |
| CN106253705A (en) * | 2016-08-02 | 2016-12-21 | 成都零智慧科技有限公司 | The frequency stabilization formula multiple-channel output linear stabilized power supply of circuit is eliminated based on ripple voltage |
| CN106488607B (en) * | 2016-09-09 | 2018-04-10 | 深圳创维－Rgb电子有限公司 | Switching Power Supply and television set |
| JP6963510B2 (en) * | 2018-01-04 | 2021-11-10 | Ntn株式会社 | Switching power supply for three-phase AC |
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