CN110928350A - Power supply with wide input voltage - Google Patents
Power supply with wide input voltage Download PDFInfo
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- CN110928350A CN110928350A CN201911267840.3A CN201911267840A CN110928350A CN 110928350 A CN110928350 A CN 110928350A CN 201911267840 A CN201911267840 A CN 201911267840A CN 110928350 A CN110928350 A CN 110928350A
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- 230000005669 field effect Effects 0.000 claims abstract description 201
- 239000003990 capacitor Substances 0.000 claims abstract description 31
- 230000001052 transient effect Effects 0.000 claims abstract description 14
- 230000000694 effects Effects 0.000 claims abstract description 7
- 230000003750 conditioning effect Effects 0.000 claims description 4
- 238000005457 optimization Methods 0.000 claims description 4
- 230000033228 biological regulation Effects 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 abstract description 5
- 230000001105 regulatory effect Effects 0.000 abstract 3
- 238000010586 diagram Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
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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
- G05F1/468—Regulating voltage or current wherein the variable actually regulated by the final control device is dc characterised by reference voltage circuitry, e.g. soft start, remote shutdown
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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
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- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
The invention discloses a power supply with wide input voltage, comprising: the reference source circuit comprises a starting circuit, a reference core circuit and a pre-regulating circuit, wherein the reference core circuit comprises a cascade circuit, a parallel effect tube circuit, a voltage division circuit and a negative feedback circuit, the negative feedback circuit comprises a field effect tube M6, a resistor R1, a resistor R2, a resistor R3, a filter capacitor C2, a triode T6, a triode T7 and a triode T3, and the pre-regulating circuit of the negative feedback structure enables the input voltage range to be wider and enables the pre-regulating circuit to bear larger input voltage fluctuation; the low dropout linear voltage stabilizing circuit improves the stability and the transient response speed thereof, so that the low dropout linear voltage stabilizing circuit can stably work in a wider temperature range under the condition of no large capacitance.
Description
Technical Field
The invention relates to the technical field of power supply, in particular to a power supply with wide input voltage.
Background
The power supply circuit generally supplies power to the digital circuit module and the analog circuit module at the same time, wherein the digital circuit module has large signal amplitude variation range and high speed, and can generate a large amount of noise to cause interference to the analog circuit module, and the low-dropout linear voltage stabilizing circuit adopted in the power supply circuit can realize the characteristics mainly because an internal adjusting tube adopts a channel field effect tube instead of a PNP transistor in a common linear voltage stabilizer, and the channel field effect tube does not need base current driving, so that the power current of the device is greatly reduced.
The LDO circuit in the present power supply has narrow voltage range and small voltage fluctuation range, which causes slow charging speed and incapability of responding in a transient state.
Disclosure of Invention
The present invention is directed to a power supply with a wide input voltage to solve the above-mentioned problems of the prior art.
The invention provides a power supply with wide input voltage, which comprises a reference source circuit, a reference core circuit and a pre-adjusting circuit, wherein the reference source circuit consists of a starting circuit, a reference core circuit and a pre-adjusting circuit;
the starting circuit comprises a field effect transistor M11, a field effect transistor M12, a field effect transistor M10, a field effect transistor M9, a field effect transistor M8, a field effect transistor M7 and a charging capacitor C1;
the drain of the field effect transistor M11 is reversely connected with the drain of the field effect transistor M12, the source of the field effect transistor M11 is connected with the sources of the field effect transistor M10 and the field effect transistor M10 in parallel, the drain of the field effect transistor M10 is electrically connected with the charging capacitor C1, the gate of the field effect transistor M10 is electrically connected with the gate of the field effect transistor M9, the drain of the field effect transistor M9 is electrically connected with the drain of the field effect transistor M8 and the gate of the field effect transistor M7, and the drain of the field effect transistor M7 is electrically connected with the gate of the field effect transistor M11; the field effect transistor M7 and the field effect transistor M11 form a positive feedback circuit;
the start-up circuit provides a current path from a power supply to ground and frees subsequent bandgap reference core circuits from degenerate bias points.
The reference core circuit comprises a cascade circuit, a parallel effect tube circuit, a voltage division circuit and a negative feedback circuit;
the cascade circuit comprises a triode T1, a triode T2 and a triode T3, wherein both the triode T1 and the triode T2 are provided with an emitter, the emitters of the triode T1 and the triode T2 are respectively and electrically connected with the preconditioning circuit through resistors R6 and R7, both the triode T1 and the triode T2 are provided with a base, the base of the triode T1 is electrically connected with the base of the triode T2, the triode T2 is provided with a collector, and the collector of the triode T2 is electrically connected with the base of the triode T3.
The parallel effect tube circuit comprises a field effect tube M3, a field effect tube M4 and a field effect tube M5;
the field-effect tube M5, the field-effect tube M4 and the field-effect tube M3 are respectively provided with a drain electrode, the drain electrodes of the field-effect tube M5, the field-effect tube M4 and the field-effect tube M3 are respectively and electrically connected with the collector electrodes of the triode T1, the triode T2 and the triode T3, the field-effect tube M5, the field-effect tube M4 and the field-effect tube M3 are respectively provided with a grid electrode, and the grid electrodes of the field-effect tube M5, the field-effect tube M4 and the field-effect tube M3 are mutually connected.
The voltage division circuit comprises a triode T4, a triode T5 and a voltage division resistor R4, wherein the base electrode of the triode T4 is electrically connected with the base electrode of the triode T5, the voltage division resistor R4 is electrically connected at the voltage division base point between the triode T4 and the triode T5, and the other end of the voltage division resistor R4 is electrically connected with a negative feedback circuit;
the negative feedback circuit comprises a field effect transistor M6, a resistor R1, a resistor R2, a resistor R3, a filter capacitor C2, a triode T6, a triode T7 and a triode T3;
bases of the triode T6 and the triode T7 are mutually and electrically connected, a collector of the triode T6 is electrically connected with a source of the field effect transistor M3, a collector of the triode T7 is electrically connected with the field effect transistor M6 through a series connection resistor R3 and a resistor R1, and emitting electrodes of the triode T6 and the triode T7 are grounded; a collector and an emitter of the triode T7 are connected in parallel with a resistor R2 and a filter capacitor C2, and the resistor R2 and the filter capacitor C2 form an RC filter circuit; the negative feedback circuit can not only improve the high-frequency power supply rejection ratio, but also reduce the output noise.
The pre-conditioning circuit comprises a field effect transistor M13, a voltage-stabilizing amplifier, a voltage-stabilizing resistor R11 and a voltage-stabilizing resistor R10;
the grid electrode of the field effect transistor M13 is electrically connected with a voltage-stabilizing amplifier, the source electrode of the field effect transistor M13 is electrically connected with a reference core circuit through voltage-stabilizing resistors R11 and R10,
after the reference core circuit is filtered by the RC filter circuit at the output end, in order to enable the circuit to work in a low-voltage state, the pre-regulation circuit provides more stable power supply voltage for the reference core circuit, voltage consumption is reduced, and power supply voltage is reduced.
A low dropout linear voltage regulator circuit, comprising: the reference source, the error amplifier, the field effect transistor, the feedback resistor and the RC filter circuit;
the reference source is loaded at the negative end of the error amplifier, the positive feedback end of the error amplifier, the feedback resistor R1 and the feedback resistor R2 form a feedback network, the feedback resistor R1, the positive feedback end of the error amplifier, the grid electrode and the drain electrode of the field effect transistor form a feedback loop, and the source electrode of the field effect transistor is loaded at two ends of the feedback resistor and connected with an RC filter circuit formed by the resistor R3 and the capacitor CL in parallel.
The transient response circuit comprises a primary feedback circuit, a secondary feedback circuit and a power amplifier;
the primary feedback circuit consists of a field effect transistor M14, a field effect transistor M19 and a feedback resistor R1;
the secondary feedback circuit consists of a field effect transistor M15, a field effect transistor M16, a field effect transistor M117 and a field effect transistor M18, wherein the grid electrode of the field effect transistor M16 is symmetrically connected with the grid electrode of the field effect transistor M17, and the power amplifier is formed together;
when the circuit is operating in steady state, M14 and M15 are biased in the cut-off region in order to avoid destroying the quiescent operating point of fet MP. When the load change is large, the output voltage at the end of M14 and the feedback voltage at the end of M19 drain fluctuate, and the change of the feedback voltage is amplified in the transient enhancement circuit. The amplified voltage may turn on M15 to increase the gate discharge current of M19 as the load current increases; when the load current is reduced, M14 is turned on, so that the gate charging current of M19 is increased, M14 and M15 are gradually turned off as VOUT is recovered to a stable value, and when the transient response circuit is subjected to a transient response, the circuit can increase the charging and discharging current and reduce the adjustment time of the gate voltage of the field effect transistor.
The gain optimization circuit comprises a field effect transistor M20, a field effect transistor M21, a field effect transistor MP and a bypass capacitor;
the drain end of the field effect transistor 20 is loaded with a voltage VIN, the field effect transistor M20, the field effect transistor M21 and the field effect transistor MP form a closed loop, and the common gate end of the field effect transistor M21 is connected in parallel with a bypass capacitor;
when the output voltage jumps down, the capacitor C is switched on, the source electrode potential of the field effect transistor M22 is pulled down, so that the current flowing through the field effect transistor M22 is increased, the pull-down current of the field effect transistor M22 is increased, the slew rate of the grid voltage of the field effect transistor is accelerated, and the transient response performance of low-dropout linear voltage stabilization is optimized.
Drawings
FIG. 1 is a circuit diagram of a reference source according to the present invention;
FIG. 2 is a diagram of a low dropout linear voltage regulator circuit according to the present invention;
FIG. 3 is a transient response circuit of the present invention;
fig. 4 is a circuit diagram of the gain optimization circuit of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the invention without making any creative effort, shall fall within the protection scope of the invention.
Referring to fig. 1, a reference source circuit is composed of a start-up circuit, a reference core circuit, and a pre-conditioning circuit;
the starting circuit comprises a field effect tube M11, a field effect tube M12, a field effect tube M10, a field effect tube M9, a field effect tube M8, a field effect tube M7 and a charging capacitor C1, wherein the drain of the field effect tube M11 is reversely connected with the drain of the field effect tube M12, the source of the field effect tube M11 is connected with the sources of the field effect tube M10 and the field effect tube M10 in parallel, the drain of the field effect tube M10 is electrically connected with the charging capacitor C1, the gate of the field effect tube M10 is electrically connected with the gate of the field effect tube M9, the drain of the field effect tube M9 is electrically connected with the drain of the field effect tube M8 and the gate of the field effect tube M7, and the drain of the field effect tube M7 is; the field effect transistor M7 and the field effect transistor M11 form a positive feedback circuit;
when the power supply voltage is electrified, the charging capacitor C1 is charged by the voltage through the field effect transistor M10, and at the moment, the grid voltage of the field effect transistor M9 is at a low level, so that the field effect transistor M9 and the field effect transistor M7 are conducted, and a current path from the power supply voltage to the ground is formed; the start-up circuit provides a current path from a power supply to ground and frees subsequent bandgap reference core circuits from degenerate bias points.
The reference core circuit comprises a cascade circuit, a parallel effect tube circuit, a voltage division circuit and a negative feedback circuit;
the cascade circuit comprises a triode T1, a triode T2 and a triode T3, wherein the triode T1 and the triode T2 are both provided with an emitter, the emitters of the triode T1 and the triode T2 are respectively and electrically connected with the preconditioning circuit through resistors R6 and R7, the triode T1 and the triode T2 are both provided with a base, the base of the triode T1 is electrically connected with the base of the triode T2, the triode T2 is provided with a collector, and the collector of the triode T2 is electrically connected with the base of the triode T3;
the parallel effect tube circuit comprises a field effect tube M3, a field effect tube M4 and a field effect tube M5;
the field-effect tube M5, the field-effect tube M4 and the field-effect tube M3 are respectively provided with a drain electrode, the drain electrodes of the field-effect tube M5, the field-effect tube M4 and the field-effect tube M3 are respectively and electrically connected with the collector electrodes of the triode T1, the triode T2 and the triode T3, the field-effect tube M5, the field-effect tube M4 and the field-effect tube M3 are respectively provided with a grid electrode, and the grid electrodes of the field-effect tube M5, the field-effect tube M4 and the field-effect tube M3 are mutually connected;
the voltage division circuit comprises a triode T4, a triode T5 and a voltage division resistor R4, wherein the base electrode of the triode T4 is electrically connected with the base electrode of the triode T5, the voltage division resistor R4 is electrically connected at the voltage division base point between the triode T4 and the triode T5, and the other end of the voltage division resistor R4 is electrically connected with a negative feedback circuit;
the negative feedback circuit comprises a field effect transistor M6, a resistor R1, a resistor R2, a resistor R3, a filter capacitor C2, a triode T6, a triode T7 and a triode T3;
bases of the triode T6 and the triode T7 are mutually and electrically connected, a collector of the triode T6 is electrically connected with a source of the field effect transistor M3, a collector of the triode T7 is electrically connected with the field effect transistor M6 through a series connection resistor R3 and a resistor R1, and emitting electrodes of the triode T6 and the triode T7 are grounded; a collector and an emitter of the triode T7 are connected in parallel with a resistor R2 and a filter capacitor C2, and the resistor R2 and the filter capacitor C2 form an RC filter circuit;
the reference core circuit utilizes a negative feedback circuit to improve the low-frequency power supply rejection ratio of the reference voltage, an RC filter circuit is added at an output port to improve the high-frequency power supply rejection ratio of the reference voltage, when the reference source Vref fluctuates, the currents of two branches of a triode T1 and a triode T2 change, thereby causing the change of the base voltage of a triode T3, further affecting the grid voltage and the drain current of a field effect tube M6, thereby eliminating the voltage fluctuation of the Vref, because the polarity of the change of the grid voltage and the drain voltage of the PMOS of both the triode T6 and the triode T7 are negative feedback, the feedback loop is negative feedback, not only the high-frequency power supply rejection ratio can be improved, but also the output noise can be reduced.
The pre-conditioning circuit comprises a field effect transistor M13, a voltage-stabilizing amplifier, a voltage-stabilizing resistor R11 and a voltage-stabilizing resistor R10;
the grid electrode of the field effect transistor M13 is electrically connected with the voltage-stabilizing amplifier, and the source electrode of the field effect transistor M13 is electrically connected with the reference core circuit through voltage-stabilizing resistors R11 and R10;
after the reference core circuit is filtered by the RC filter circuit at the output end, in order to enable the circuit to work in a low-voltage state, the pre-regulation circuit provides more stable power supply voltage for the reference core circuit, voltage consumption is reduced, and power supply voltage is reduced.
Referring to fig. 2, a low dropout linear voltage regulator circuit includes: the reference source, the error amplifier, the field effect transistor, the feedback resistor and the RC filter circuit;
the reference source is loaded at the negative end of the error amplifier, the positive feedback end of the error amplifier, the feedback resistor R1 and the feedback resistor R2 form a feedback network, the feedback resistor R1, the positive feedback end of the error amplifier, the grid electrode and the drain electrode of the field effect transistor form a feedback loop, and the source electrode of the field effect transistor is loaded with the feedback resistor, and two ends of the feedback resistor are connected with an RC filter circuit formed by the resistor R3 and the capacitor CL in parallel;
the reference core circuit provides reference voltage for the low-dropout linear voltage stabilizing circuit, the feedback resistors R1 and R2 sample the output voltage Vout and input the sampled output voltage Vout into the anode feedback end of the error amplifier, and the sampled output voltage Vout is filtered by the RC filter circuit to provide stable power supply voltage; when the power supply voltage is less than VIN, the field effect transistor cannot be turned on, no output current exists, the output voltage is zero, the low-dropout linear voltage stabilizing circuit works in a turn-off region, the field effect transistor is turned on along with the increase of the power supply voltage along with the increase of the voltage, although the output voltage exists, the circuit has no adjusting function, and the output voltage is unstable; when the power supply voltage is greater than VIN, the field effect transistor works in a saturation region, the resistor R3 is switched on, and the circuit voltage tends to be stable;
referring to fig. 3, a transient response circuit includes a primary feedback circuit, a secondary feedback circuit, and a power amplifier;
the primary feedback circuit consists of a field effect transistor M14, a field effect transistor M19 and a feedback resistor R1;
the secondary feedback circuit consists of a field effect transistor M15, a field effect transistor M16, a field effect transistor M117 and a field effect transistor M18, wherein the grid electrode of the field effect transistor M16 is symmetrically connected with the grid electrode of the field effect transistor M17 to jointly form a power amplifier, and the secondary feedback circuit is connected with the power amplifier through a power line and is connected with the power line through a power line
When the circuit is operating in steady state, M14 and M15 are biased in the cut-off region in order to avoid destroying the quiescent operating point of fet MP. When the load change is large, the output voltage at the end of M14 and the feedback voltage at the end of M19 drain fluctuate, and the change of the feedback voltage is amplified in the transient enhancement circuit. The amplified voltage may turn on M15 to increase the gate discharge current of M19 as the load current increases; when the load current decreases, M14 is turned on to increase the gate charging current of M19. As VOUT recovers to a stable value, M14 and M15 are gradually turned off, and when the transient response circuit is loaded with transient response, the circuit can increase the charging and discharging current and reduce the adjustment time of the grid voltage of the field effect transistor.
Referring to fig. 4, the gain optimization circuit includes a field effect transistor M20, a field effect transistor M21, a field effect transistor MP, and a bypass capacitor;
the drain end of the field effect transistor 20 is loaded with a voltage VIN, the field effect transistor M20, the field effect transistor M21 and the field effect transistor MP form a closed loop, and the common gate end of the field effect transistor M21 is connected in parallel with a bypass capacitor;
a bypass capacitor is connected in parallel at two ends of the field effect transistor M21, the bypass capacitor is equivalent to an open circuit at low frequency, and the work of the field effect transistor M21 is not influenced; the bypass capacitor is equivalent to a passage at high frequency, the field effect transistor M21 is short-circuited without amplification, when the output voltage jumps, the capacitor C is switched on, the source electrode potential of the field effect transistor M22 is pulled low, so that the current flowing through the field effect transistor M22 is increased, the pull-down current of the field effect transistor M22 is increased, the slew rate of the grid voltage of the field effect transistor is accelerated, and the transient response performance of low-dropout linear voltage stabilization is optimized.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (5)
1. A power supply having a wide input voltage, comprising:
the reference source circuit consists of a starting circuit, a reference core circuit and a pre-adjusting circuit;
the starting circuit comprises a field effect transistor M11, a field effect transistor M12, a field effect transistor M10, a field effect transistor M9, a field effect transistor M8, a field effect transistor M7 and a charging capacitor C1; wherein,
the field effect transistor M7 and the field effect transistor M11 form a positive feedback circuit;
the reference core circuit comprises a cascade circuit, a parallel effect tube circuit, a voltage division circuit and a negative feedback circuit;
the cascade circuit comprises a triode T1, a triode T2 and a triode T3;
the parallel effect tube circuit comprises a field effect tube M3, a field effect tube M4 and a field effect tube M5;
the voltage division circuit comprises a triode T4, a triode T5 and a voltage division resistor R4;
the base electrode of the triode T4 is electrically connected with the base electrode of the triode T5, the voltage dividing resistor R4 is electrically connected at the voltage dividing base point between the triode T4 and the triode T5, and the other end of the voltage dividing resistor R4 is electrically connected with the negative feedback circuit;
the negative feedback circuit comprises a field effect transistor M6, a resistor R1, a resistor R2, a resistor R3, a filter capacitor C2, a triode T6, a triode T7 and a triode T3;
bases of the triode T6 and the triode T7 are mutually and electrically connected, a collector of the triode T6 is electrically connected with a source of the field effect transistor M3, a collector of the triode T7 is electrically connected with the field effect transistor M6 through a series connection resistor R3 and a resistor R1, and emitting electrodes of the triode T6 and the triode T7 are grounded;
a collector and an emitter of the triode T7 are connected in parallel with a resistor R2 and a filter capacitor C2, and the resistor R2 and the filter capacitor C2 form an RC filter circuit;
the pre-conditioning circuit comprises a field effect transistor M13, a voltage-stabilizing amplifier, a voltage-stabilizing resistor R11 and a voltage-stabilizing resistor R10;
the grid electrode of the field effect transistor M13 is electrically connected with the voltage-stabilizing amplifier, and the source electrode of the field effect transistor M13 is electrically connected with the reference core circuit through voltage-stabilizing resistors R11 and R10;
a low dropout linear voltage regulator circuit, comprising: the reference source, the error amplifier, the field effect transistor, the feedback resistor and the RC filter circuit;
the reference source is loaded at the negative end of the error amplifier;
the positive feedback end of the error amplifier, the feedback resistor R1 and the feedback resistor R2 form a feedback network;
the transient response circuit comprises a primary feedback circuit, a secondary feedback circuit and a power amplifier;
the primary feedback circuit consists of a field effect transistor M14, a field effect transistor M19 and a feedback resistor R1;
the secondary feedback circuit consists of a field effect transistor M15, a field effect transistor M16, a field effect transistor M117 and a field effect transistor M18, wherein the grid electrode of the field effect transistor M16 is symmetrically connected with the grid electrode of the field effect transistor M17, and the power amplifier is formed together;
the gain optimization circuit comprises a field effect transistor M20, a field effect transistor M21, a field effect transistor MP and a bypass capacitor;
the drain terminal of the fet 20 is loaded with a voltage VIN, the fet M20, the fet M21, and the fet MP form a closed loop, and the common gate terminal of the fet M21 is connected in parallel to the bypass capacitor.
2. A power supply as claimed in claim 1, having a wide input voltage, wherein: the drain of the field effect transistor M11 is reversely connected with the drain of the field effect transistor M12, the source of the field effect transistor M11 is connected with the sources of the field effect transistor M10 and the field effect transistor M10 in parallel, the drain of the field effect transistor M10 is electrically connected with the charging capacitor C1, the gate of the field effect transistor M10 is electrically connected with the gate of the field effect transistor M9, the drain of the field effect transistor M9 is electrically connected with the drain of the field effect transistor M8 and the gate of the field effect transistor M7, and the drain of the field effect transistor M7 is electrically connected with the gate of the field effect transistor M11.
3. A power supply as claimed in claim 1, having a wide input voltage, wherein: the triode T1 and the triode T2 are respectively provided with an emitter, and the emitters of the triode T1 and the triode T2 are respectively and electrically connected with the pre-regulation circuit through a resistor R6 and a resistor R7;
the triode T1 and the triode T2 both have bases, and the base of the triode T1 is electrically connected with the base of the triode T2;
the transistor T2 has a collector, and the collector of the transistor T2 is electrically connected to the base of the transistor T3.
4. A power supply as claimed in claim 1, having a wide input voltage, wherein: the field-effect tube M5, the field-effect tube M4 and the field-effect tube M3 are respectively provided with a drain electrode, and the drain electrodes of the field-effect tube M5, the field-effect tube M4 and the field-effect tube M3 are respectively and electrically connected with the collector electrodes of the triode T1, the triode T2 and the triode T3;
the field effect transistor M5, the field effect transistor M4 and the field effect transistor M3 are all provided with a grid, and the grids of the field effect transistor M5, the field effect transistor M4 and the field effect transistor M3 are connected in parallel.
5. A power supply as claimed in claim 1, having a wide input voltage, wherein: the feedback resistor R1, the anode feedback end of the error amplifier, the grid electrode and the drain electrode of the field effect transistor form a feedback loop; and,
and the source electrode of the field effect transistor is loaded with the two ends of the feedback resistor, and the two ends of the feedback resistor are connected in parallel with an RC filter circuit consisting of a resistor R3 and a capacitor CL.
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| CN113067466A (en) * | 2021-05-19 | 2021-07-02 | 上海鸿晔电子科技股份有限公司 | Voltage source circuit and power management chip |
| CN113485519A (en) * | 2021-07-15 | 2021-10-08 | 上海艾为电子技术股份有限公司 | Linear voltage-stabilizing power supply circuit |
| US11921531B2 (en) | 2020-12-17 | 2024-03-05 | Hamilton Sundstrand Corporation | Zener diode power path control for extended operation range of linear power supplies |
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| US11921531B2 (en) | 2020-12-17 | 2024-03-05 | Hamilton Sundstrand Corporation | Zener diode power path control for extended operation range of linear power supplies |
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| CN113485519B (en) * | 2021-07-15 | 2022-11-04 | 上海艾为电子技术股份有限公司 | Linear voltage-stabilizing power supply circuit |
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