CN109471484A - A kind of self-adaptive current output low pressure difference linear voltage regulator - Google Patents
A kind of self-adaptive current output low pressure difference linear voltage regulator Download PDFInfo
- Publication number
- CN109471484A CN109471484A CN201811548307.XA CN201811548307A CN109471484A CN 109471484 A CN109471484 A CN 109471484A CN 201811548307 A CN201811548307 A CN 201811548307A CN 109471484 A CN109471484 A CN 109471484A
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- Prior art keywords
- low pressure
- pressure difference
- voltage regulator
- difference linear
- linear voltage
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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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
The present invention provides a kind of self-adaptive current output low pressure difference linear voltage regulator, comprising: low pressure difference linear voltage regulator, pass-transistor and adjusting circuit, the pass-transistor are in parallel with low pressure difference linear voltage regulator；The pass-transistor is PNP transistor, and PNP transistor C-terminal connects power output end；The adjusting circuit includes first resistor, second resistance, 3rd resistor and diode, and first resistor one end connects the power input other end and connects the end PNP transistor E；Second resistance one end connects the power input other end and connects diode input terminal；Diode output is separately connected the input voltage VIN end of low pressure difference linear voltage regulator and the crystal pipe B end of pass-transistor；3rd resistor is connected in parallel on diode both ends.The present invention is capable of increasing low pressure difference linear voltage regulator output electric current, and increases and have no effect on LDO output accuracy while exporting electric current.
Description
Technical field
The invention belongs to power technique fields, and in particular to a kind of self-adaptive current output low pressure difference linear voltage regulator.
Background technique
In electronic circuit DC/DC power-supply service, most common is Switching Power Supply and LDO.Switch power supply output current
Greatly, high-efficient, but due to its switching characteristic, output voltage ripple noise is larger, can interfere the operating accuracy of high-accuracy device.
LDO has many advantages, such as that ultra low voltage noise, interference are small, is widely applied in high-precision, low noise power supply occasion, but LDO is imitated
Rate is low, calorific value is big, and current output capability is limited, be generally only applicable to load current be less than 1A occasion, which has limited its
The application of the larger occasion of current needs.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of self-adaptive current output low pressure difference linear voltage regulator, with solution
Certainly above-mentioned technical problem.
The embodiment of the present application provides a kind of self-adaptive current output low pressure difference linear voltage regulator, comprising: low pressure difference linearity is steady
Depressor, pass-transistor and adjusting circuit, the pass-transistor are in parallel with low pressure difference linear voltage regulator；
The pass-transistor is PNP transistor, and PNP transistor C-terminal connects power output end；
The adjusting circuit includes first resistor, second resistance, 3rd resistor and diode, first resistor one end connection electricity
The source input terminal other end connects the end PNP transistor E；It is defeated that second resistance one end connects power input other end connection diode
Enter end；Diode output is separately connected the input voltage VIN end of low pressure difference linear voltage regulator and the transistor B of pass-transistor
End；3rd resistor is connected in parallel on diode both ends.
In a kind of embodiment of the application, the maximum output current of the PNP transistor is slightly larger than low voltage difference line
The maximum output current of property voltage-stablizer.
In a kind of embodiment of the application, the maximum output current of the PNP transistor is that low pressure difference linearity is steady
1.2 times of the maximum output current of depressor.
In a kind of embodiment of the application, the forward conduction voltage drop of the diode is no more than PNP transistor
Conduction threshold.
In a kind of embodiment of the application, the low pressure difference linear voltage regulator includes LDO chip U1, input voltage
The end VIN, the end output voltage VO UT, the enabled end EN and the feedback end FB；The input voltage VIN end, enables the end output voltage VO UT
The end EN and the feedback end FB are all connected with LDO chip U1.
In a kind of embodiment of the application, the LDO chip U1 is equipped with ground terminal；The end feedback FB passes through the 4th
Resistance connects power output end；The end feedback FB passes through the 5th resistance eutral grounding.
In a kind of embodiment of the application, power input is grounded by first capacitor.
In a kind of embodiment of the application, power output end passes through the second capacity earth.
In a kind of embodiment of the application, the resistance value of 3rd resistor is set according to the forward conduction voltage drop of diode.
In a kind of embodiment of the application, according to the voltage range of PNP transistor be arranged first resistor resistance value and
Second resistance resistance value.
The beneficial effects of the present invention are,
Self-adaptive current output low pressure difference linear voltage regulator provided by the invention passes through the additional adjusting of pass-transistor in parallel
Circuit promotes low pressure difference linear voltage regulator (LDO) current output capability, the adjusting circuit being made of diode and resistance, can be with
LDO input current variation dynamic controls the conducting degree of pass-transistor, and then controls the output voltage of pass-transistor rear class
And electric current.The output electric current of LDO is bigger, and the conducting degree of transistor is bigger, and by-pass current is also bigger, to play increase output
The effect of electric current, and increase and have no effect on LDO output accuracy while exporting electric current.
In addition, design principle of the present invention is reliable, structure is simple, has very extensive application prospect.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, without creative efforts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the schematic circuit signal of the self-adaptive current output low pressure difference linear voltage regulator of the application one embodiment
Figure.
Specific embodiment
Technical solution in order to enable those skilled in the art to better understand the present invention, below in conjunction with of the invention real
The attached drawing in example is applied, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work, all should belong to protection of the present invention
Range.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood by concrete condition
Concrete meaning in the present invention.
As shown in Figure 1, the embodiment of the present application provides a kind of self-adaptive current output low pressure difference linear voltage regulator, comprising: low
Pressure difference linear voltage regulator, pass-transistor and adjusting circuit, the pass-transistor are in parallel with low pressure difference linear voltage regulator；It is described
It adjusts circuit input end and connects power input, the output end for adjusting circuit is separately connected the electricity of low pressure difference linear voltage regulator
Press the crystal pipe B end of input terminal and pass-transistor；
The pass-transistor includes first resistor and PNP transistor, and described first resistor one end connects voltage input
The other end is held to connect the end PNP transistor E；PNP transistor C-terminal connects power output end；
The adjusting circuit includes second resistance, 3rd resistor and diode, 3rd resistor and diodes in parallel and third
Resistance is connected with the parallel branch of diode with second resistance.
Optionally, as the application one embodiment, the maximum output current of the PNP transistor is slightly larger than low voltage difference
The maximum output current of linear voltage regulator.
Optionally, as the application one embodiment, the maximum output current of the PNP transistor is low pressure difference linearity
1.2 times of the maximum output current of voltage-stablizer.
Optionally, as the application one embodiment, the forward conduction voltage drop of the diode is not more than PNP transistor
Conduction threshold.
Optionally, as the application one embodiment, the low pressure difference linear voltage regulator includes LDO chip U1, input electricity
Press the end VIN, the end output voltage VO UT, the enabled end EN and the feedback end FB；The input voltage VIN end, makes the end output voltage VO UT
The energy end EN and the feedback end FB are all connected with LDO chip U1.
Optionally, as the application one embodiment, the LDO chip U1 is equipped with ground terminal；The end feedback FB passes through
4th resistance connects power output end；The end feedback FB passes through the 5th resistance eutral grounding.
Optionally, as the application one embodiment, power input is grounded by first capacitor.
Optionally, as the application one embodiment, power output end passes through the second capacity earth.
Optionally, as the application one embodiment, the resistance of 3rd resistor is set according to the forward conduction voltage drop of diode
Value.
Optionally, as the application one embodiment, first resistor resistance value is arranged according to the voltage range of PNP transistor
With second resistance resistance value.
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
Embodiment 1
As shown in Figure 1, the present embodiment provides a kind of self-adaptive currents to export low pressure difference linear voltage regulator, comprising: low voltage difference
Linear voltage regulator, pass-transistor and adjusting circuit, the pass-transistor are in parallel with low pressure difference linear voltage regulator；
The pass-transistor is PNP transistor, and PNP transistor C-terminal connects power output end；
The adjusting circuit includes first resistor, second resistance, 3rd resistor and diode, first resistor one end connection electricity
The source input terminal other end connects the end PNP transistor E；It is defeated that second resistance one end connects power input other end connection diode
Enter end；Diode output is separately connected the input voltage VIN end of low pressure difference linear voltage regulator and the transistor B of pass-transistor
End；3rd resistor is connected in parallel on diode both ends.
Low pressure difference linear voltage regulator include LDO chip U1, input voltage VIN end, the end output voltage VO UT, the enabled end EN and
Feed back the end FB；The input voltage VIN end, the end output voltage VO UT, the enabled end EN and the feedback end FB are all connected with LDO chip U1.
About transistor Q1, PNP transistor is selected, the IEC_max (maximum output current) of Q1 is slightly larger than the maximum of LDO
It exports electric current Io_max (maximum output current), to reduce Q1 volume and VBE threshold voltage.In view of the output electricity of circuit
Precision and job stability are pressed, the electric current that bypass Q1 shares should not be too large, and general control is being no more than LDO itself output electric current
Preferably.
About diode D1, the effect of diode D1 is to provide fixed pressure drop, can to reduce requirement of the circuit to R2 pressure drop
Reduce R2 resistance value and power consumption.The forward conduction voltage drop of D1 should be not more than the conduction threshold of Q1, so that the Q1 when load current is smaller
It is in close state, load current is only exported by LDO.
Resistance R3, resistance R3 play bypass to diode D1, so as to avoid D1 forward voltage drop in load current very little
Q1 is set to mislead.When load current is larger, the effect of R3 is negligible.
About resistance R1 and R2, resistance R1 and R2 play the role of current limliting and adjust the VBE voltage of Q1, it is therefore an objective to: work as LDO
(30% is generally taken) when load factor is smaller, is turned off Q1, is only provided load current by LDO itself；When LDO load factor is more than 30%
When, Q1 begins to turn on and undertakes certain load current；When LDO load reaches maximum, Q1 exports the load that electric current is equal to LDO
Electric current makes the maximum output current of the exportable twice LDO of this circuit.
Illustrate this circuit is how to increase LDO output electric current below based on several exemplary operation states:
1) when load current is 0, the E pole tension of Q1 and the IN voltage of U1 are VCC, and VBE=0, transistor Q1 are in
Closed state；
2) load current starts to increase, the incoming line of R2 and D1 as U1, and both ends can generate certain pressure drop, R1 and
There are same voltage drop values at the both ends VBE, and with the increase of load current, the end the VIN voltage of U1 is reduced, | VBE | increase, reaches Q1
Conduction threshold, Q1 begins to turn on, and portion of electrical current is exported by Q1 to the side VOUT；
3) continue to increase with load current, | VBE | increase, Q1 is connected degree and increases, and the electric current IEC for flowing through Q1 increases
Greatly, Q1 has shared more electric current, and the electric current for flowing through Q1 is superimposed with the output electric current of LDO itself, increases the electric current output of LDO
Ability.
Embodiment 2
The present embodiment provides a kind of self-adaptive currents to export low pressure difference linear voltage regulator, comprising: low pressure difference linear voltage regulator,
Pass-transistor and adjusting circuit, the pass-transistor are in parallel with low pressure difference linear voltage regulator；
The pass-transistor is PNP transistor, and PNP transistor C-terminal connects power output end；
The adjusting circuit includes first resistor, second resistance, 3rd resistor and diode, first resistor one end connection electricity
The source input terminal other end connects the end PNP transistor E；It is defeated that second resistance one end connects power input other end connection diode
Enter end；Diode output is separately connected the input voltage VIN end of low pressure difference linear voltage regulator and the transistor B of pass-transistor
End；3rd resistor is connected in parallel on diode both ends.
Low pressure difference linear voltage regulator include LDO chip U1, input voltage VIN end, the end output voltage VO UT, the enabled end EN and
Feed back the end FB；The input voltage VIN end, the end output voltage VO UT, the enabled end EN and the feedback end FB are all connected with LDO chip U1.
The LDO chip U1 is equipped with ground terminal；The end feedback FB connects power output end by the 4th resistance；The end feedback FB is logical
Cross the 5th resistance eutral grounding.Power input is grounded by first capacitor.Power output end passes through the second capacity earth.
About transistor Q1, PNP transistor is selected, the IEC_max of Q1 is the maximum output current Io_max of LDO
1.2 times, to reduce Q1 volume and VBE threshold voltage.In view of the output voltage precision and job stability of circuit, Q1 points are bypassed
The electric current of load should not be too large, and general control is advisable no more than LDO itself output electric current.
Although by reference to attached drawing and combining the mode of preferred embodiment to the present invention have been described in detail, the present invention
It is not limited to this.Without departing from the spirit and substance of the premise in the present invention, those of ordinary skill in the art can be to the present invention
Embodiment carry out various equivalent modifications or substitutions, and these modifications or substitutions all should in covering scope of the invention/appoint
What those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, answer
It is included within the scope of the present invention.Therefore, protection scope of the present invention is answered described is with scope of protection of the claims
It is quasi-.
Claims (10)
1. a kind of self-adaptive current exports low pressure difference linear voltage regulator characterized by comprising low pressure difference linear voltage regulator, side
Road transistor and adjusting circuit, the pass-transistor are in parallel with low pressure difference linear voltage regulator；
The pass-transistor is PNP transistor, and PNP transistor C-terminal connects power output end；
The adjusting circuit includes first resistor, second resistance, 3rd resistor and diode, and it is defeated that first resistor one end connects power supply
Enter to hold the other end to connect the end PNP transistor E；Second resistance one end connects the connection diode input of the power input other end
End；Diode output is separately connected the input voltage VIN end of low pressure difference linear voltage regulator and the transistor B of pass-transistor
End；3rd resistor is connected in parallel on diode both ends.
2. self-adaptive current according to claim 1 exports low pressure difference linear voltage regulator, which is characterized in that the positive-negative-positive
The maximum output current of transistor is slightly larger than the maximum output current of low pressure difference linear voltage regulator.
3. self-adaptive current according to claim 2 exports low pressure difference linear voltage regulator, which is characterized in that the positive-negative-positive
The maximum output current of transistor is 1.2 times of the maximum output current of low pressure difference linear voltage regulator.
4. self-adaptive current according to claim 1 exports low pressure difference linear voltage regulator, which is characterized in that the diode
Forward conduction voltage drop be not more than PNP transistor conduction threshold.
5. self-adaptive current according to claim 1 exports low pressure difference linear voltage regulator, which is characterized in that the low voltage difference
Linear voltage regulator includes LDO chip U1, input voltage VIN end, the end output voltage VO UT, the enabled end EN and the feedback end FB；It is described
Input voltage VIN end, the end output voltage VO UT, the enabled end EN and the feedback end FB are all connected with LDO chip U1.
6. self-adaptive current according to claim 5 exports low pressure difference linear voltage regulator, which is characterized in that the LDO core
Piece U1 is equipped with ground terminal；The end feedback FB connects power output end by the 4th resistance；The end feedback FB passes through the 5th electricity
Resistance ground connection.
7. self-adaptive current according to claim 1 exports low pressure difference linear voltage regulator, which is characterized in that power input
It is grounded by first capacitor.
8. self-adaptive current according to claim 1 exports low pressure difference linear voltage regulator, which is characterized in that power output end
Pass through the second capacity earth.
9. self-adaptive current according to claim 1 exports low pressure difference linear voltage regulator, which is characterized in that according to diode
Forward conduction voltage drop setting 3rd resistor resistance value.
10. self-adaptive current according to claim 1 exports low pressure difference linear voltage regulator, which is characterized in that according to positive-negative-positive
The voltage range setting first resistor resistance value and second resistance resistance value of transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811548307.XA CN109471484A (en) | 2018-12-18 | 2018-12-18 | A kind of self-adaptive current output low pressure difference linear voltage regulator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811548307.XA CN109471484A (en) | 2018-12-18 | 2018-12-18 | A kind of self-adaptive current output low pressure difference linear voltage regulator |
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| CN109471484A true CN109471484A (en) | 2019-03-15 |
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| CN201811548307.XA Pending CN109471484A (en) | 2018-12-18 | 2018-12-18 | A kind of self-adaptive current output low pressure difference linear voltage regulator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111796621A (en) * | 2020-07-16 | 2020-10-20 | 山东超越数控电子股份有限公司 | Constant current source control method based on linear voltage stabilizer and constant current source circuit |
| WO2023155579A1 (en) * | 2022-02-15 | 2023-08-24 | Oppo广东移动通信有限公司 | Power supply apparatus, power supply control method, electronic device, and readable storage medium |
| US11999318B2 (en) | 2022-02-17 | 2024-06-04 | Bendix Commercial Vehicle Systems Llc | Tamper detection system |
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| CN201215989Y (en) * | 2008-06-23 | 2009-04-01 | 青岛海信电器股份有限公司 | Voltage stabilizing circuit and television set having the voltage stabilizing circuit |
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| CN201945904U (en) * | 2010-12-24 | 2011-08-24 | 江苏海拉尔电气有限公司 | Constant-current circuit with current limiting function |
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| US11999318B2 (en) | 2022-02-17 | 2024-06-04 | Bendix Commercial Vehicle Systems Llc | Tamper detection system |
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Application publication date: 20190315 |