CN104679087B - Vehicle-mounted low differential voltage linear voltage stabilizer circuit and low-voltage compensation circuit thereof - Google Patents
Vehicle-mounted low differential voltage linear voltage stabilizer circuit and low-voltage compensation circuit thereof Download PDFInfo
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- CN104679087B CN104679087B CN201310610600.5A CN201310610600A CN104679087B CN 104679087 B CN104679087 B CN 104679087B CN 201310610600 A CN201310610600 A CN 201310610600A CN 104679087 B CN104679087 B CN 104679087B
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Abstract
The present invention relates to a kind of vehicle-mounted low differential voltage linear voltage stabilizer circuit, it includes a three-terminal voltage-stabilizing chip and low-voltage compensation circuit.This low-voltage compensation circuit includes a testing circuit, a high voltage conduction circuit, a low pressure turning circuit and a compensation voltage stabilizing module.The vehicle-mounted low differential voltage linear voltage stabilizer circuit simple in construction of the present invention, on-off circuit and stabilivolt only with conventional voltage detecting circuit, as high or low pressure turning circuit can realize, and improvement cost is low.Can realize input voltage source voltage normal time by three-terminal voltage-stabilizing chip power supply, utilize when input voltage source voltage is relatively low input voltage source and stabilivolt directly to power, it is ensured that the normal work of load, improve vehicle-mounted stability when being supported on low voltage operating.
Description
Technical field
The present invention relates to a kind of vehicle-mounted power supply circuits, particularly to a kind of vehicle-mounted low pressure difference linear voltage regulator (low dropout regulator, LDO) circuit.
Background technology
Along with the development of automobile, vehicular applications device gets more and more, and such as vehicle mounted multimedia etc., makes automobile more and more higher to the voltage request of low voltage operating, and the voltage request of low voltage operating is supply voltage 9V former so can work following.And ordinary circumstance exists, vehicle-mounted common regulated power supply manager requires that minimum pressure reduction is between 2V to 3V, it is impossible to realize the function of input 9V output this extremely low voltage of 8.5V.Giving an example, the power supply circuits of vehicle audio, as it is shown in figure 1, this power supply circuits obtain 12V input voltage (SYS+12V) from vehicular power-bottle, are converted to 8.5V output voltage (RADIO_8.5V).But the output of vehicular power-bottle non-constant, when input voltage is less than 10V, now output voltage can be caused to be less than 8.5V due to the characteristic of 3 ends voltage stabilizing chip (8.5VLDO), cause vehicle audio job insecurity even cannot work.
Summary of the invention
The invention aims to overcome the defect of above-mentioned background technology, it is provided that a kind of circuit structure is simple and practical, have the vehicle-mounted low pressure difference linear voltage regulator of low-voltage compensation circuit.
A kind of vehicle-mounted low differential voltage linear voltage stabilizer circuit, it includes a three-terminal voltage-stabilizing chip and low-voltage compensation circuit.This low-voltage compensation circuit includes a testing circuit, a high voltage conduction circuit, a low pressure turning circuit and a compensation voltage stabilizing module.The input of described three-terminal voltage-stabilizing chip is connected with power input, also by capacity earth by resistance element.The outfan of described three-terminal voltage-stabilizing chip is used for powering to the load, and it passes through capacity earth.Described testing circuit detects the input voltage of described power input, and described input voltage is converted to the first voltage.High voltage conduction is electrically connected between the input of described power input and three-terminal voltage-stabilizing chip, and it is conducting when described first voltage is more than or equal to the first preset value, otherwise cut-off is to stop to three-terminal voltage-stabilizing chip power supply.Low pressure turning circuit is conducting when described first voltage is less than described first preset value, conducts described input voltage to its outfan.Compensation voltage stabilizing module include negative electrode be connected with described load, the stabilivolt of plus earth, the negative electrode of this stabilivolt is connected with the outfan of described low pressure turning circuit and the outfan of three-terminal voltage-stabilizing chip respectively also by two resistance elements.
Preferably, described testing circuit includes the first resistance and the second resistance, and after described first and second resistant series, one end is connected with described power input, other end ground connection, and the junction point of the first and second resistance is as the outfan of testing circuit.
Preferably, described low pressure turning circuit includes the first switching tube and second switch pipe, first end of the first switching tube is connected with described power input, and its second end is connected with the negative electrode of described stabilivolt by described resistance element, and it controls end and is connected with the first end of second switch pipe；Second end ground connection of described second switch pipe, it controls end and is connected with high voltage conduction circuit；The voltage of the first end of described first switching tube is higher than its second terminal voltage, and controls conducting when terminal voltage is low level；Described second switch pipe the voltage of the first end higher than its second terminal voltage, and control conducting when terminal voltage is high level.
Preferably, described first switching tube is PNP type triode, and its first end is emitter stage, and the second end is colelctor electrode, and control end is base stage；Described second switch pipe is NPN type triode, and its first end is colelctor electrode, and the second end is emitter stage, and control end is base stage.
Preferably, described high voltage conduction circuit includes the 3rd switching tube, the 4th switching tube and the 5th switching tube；First end of the 4th switching tube is connected with described power input, and its second end electrically connects with the input of three-terminal voltage-stabilizing chip, and its first end controlling end and the 3rd switching tube is connected；Second end ground connection of described 3rd switching tube, it controls end and is connected with the outfan of testing circuit and the control end of the 5th switching tube；First end of the 5th switching tube is connected with power input, its second end ground connection；Described 3rd and the 5th switching tube is more than the second terminal voltage in its first terminal voltage, and it controls conducting when end is high level；Described 3rd switching tube is more than the second terminal voltage in its first terminal voltage, and it controls conducting when end is low level.
Preferably, described 3rd and the 5th switching tube is NPN type triode, and its first end is colelctor electrode, and the second end is emitter stage, and control end is base stage；Described 4th switching tube is PNP type triode, and its first end is emitter stage, and the second end is colelctor electrode, and control end is base stage.
Preferably, described resistance element includes resistance.
The vehicle-mounted low differential voltage linear voltage stabilizer circuit simple in construction of the present invention, on-off circuit and stabilivolt only with conventional voltage detecting circuit, as high or low pressure turning circuit can realize, and improvement cost is low.Can realize input voltage source voltage normal time by three-terminal voltage-stabilizing chip power supply, utilize when input voltage source voltage is relatively low input voltage source and stabilivolt directly to power, it is ensured that the normal work of load, improve vehicle-mounted stability when being supported on low voltage operating.
Accompanying drawing explanation
Fig. 1 is traditional vehicle-mounted low pressure difference linear voltage regulator power supply circuit.
Fig. 2 is the circuit theory diagrams of one embodiment of the invention mesolow difference linear constant voltage regulator circuit.
Detailed description of the invention
Below in conjunction with accompanying drawing, the vehicle-mounted low differential voltage linear voltage stabilizer circuit of the present invention is further described.
As in figure 2 it is shown, the vehicle-mounted low pressure difference linear voltage regulator of the present invention (low dropout regulator, LDO) circuit can reach the least input voltage and output voltage difference, during so that the voltage of input voltage source is relatively low, load still can normally work.This vehicle-mounted low differential voltage linear voltage stabilizer circuit includes LDO voltage stabilizer 1 and low-voltage compensation circuit 2.
LDO voltage stabilizer 1 mainly includes three-terminal voltage-stabilizing chip U1 and electric capacity C1, C2, C3 and C4.Three-terminal voltage-stabilizing chip uses the ability with regulated output voltage, electric current, it is ensured that port voltage size meets setting value.In the present embodiment, vehicle-mounted low pressure difference linear voltage regulator obtains unstable 12V voltage (Vin) from vehicular power-bottle (by power input 100), is then converted into 8.5V voltage (Vout) and exports to vehicle audio (by outfan 200).The input of three-terminal voltage-stabilizing chip U1 is connected with power input 100, also by the polarity free capacitor C1 being connected in parallel and polarized electric capacity C4 ground connection by resistance.The wherein minus earth of electric capacity C4.The outfan of three-terminal voltage-stabilizing chip U1 is connected, also by the polarity free capacitor C3 being connected in parallel and polarized electric capacity C2 ground connection with load as the outfan 200 of vehicle-mounted low differential voltage linear voltage stabilizer circuit.The wherein minus earth of electric capacity C2, the setting of electric capacity C1 and C3 makes to prevent the ripple and the impulse disturbances that are provided for absorbing low frequency of high-frequency signal interference three-terminal voltage-stabilizing chip U1, electric capacity C2 and C4.
Low-voltage compensation circuit 2 includes testing circuit 21, high voltage conduction circuit 22, low pressure turning circuit 23 and compensation voltage stabilizing module 24.Input voltage vin, for detecting the input voltage vin of power input 100, is converted to the first voltage and exports by testing circuit 21.High voltage conduction circuit 23 is connected between the input of power input Vin and LDO voltage stabilizer 1, and it is conducting when the first voltage is more than or equal to the first preset value, otherwise cut-off is to stop powering to three-terminal voltage-stabilizing chip U1, makes three-terminal voltage-stabilizing chip U1 quit work.Low pressure turning circuit 22 is conducting when the first voltage is less than the first preset value, conducts input voltage vin to its outfan.Compensation voltage stabilizing module 24 mainly includes stabilivolt Z1.The negative electrode of stabilivolt Z1 and outfan 200, namely load is connected, its plus earth.The negative electrode of stabilivolt Z1 is connected with the outfan of low pressure turning circuit 22 and the outfan of three-terminal voltage-stabilizing chip U1 respectively also by two resistance R3 with R4.
So, when the input voltage vin of power input 100 is greater than or equal to expection, when being greater than or be equal to 10V, LDO voltage stabilizer 1 power to the load.When power input 100 input voltage vin less than expection time, e.g., less than during 10V, input voltage vin the stabilivolt Z1 powered is load supplying, it can be ensured that be supported on input voltage vin relatively low time also can normally work.
In the present embodiment, testing circuit 21 includes the first resistance R1 and the second resistance R2.After first and second resistance R1, R2 series connection, one end is connected with power input 100, and other end ground connection, the junction point 211 of first and second resistance R1, R2 is as the outfan of testing circuit.
Low pressure turning circuit 22 includes the first switching tube Q1 and second switch pipe Q2.First end of the first switching tube Q1 is connected with power input 100, and its second end is connected by the negative electrode of resistance R3 and stabilivolt Z1, and it controls end and is connected with first end of second switch pipe Q2.The second end ground connection of second switch pipe Q2, it controls end and is connected with high voltage conduction circuit 23.First switching tube Q1 is higher than its second terminal voltage at the voltage of its first end, and controls conducting when terminal voltage is low level.Second switch pipe Q2 is higher than its second terminal voltage at the voltage of its first end, and controls conducting when terminal voltage is high level.Herein, so-called high level and low level be for the switching voltage of switching tube for, for common audion, it is low pressure less than 0.7V, is high pressure higher than 0.7V, for the compound audion of strip resistance, according to the difference of resistance, high pressure may be more than 1V.In the present embodiment, the first switching tube Q1 is PNP type triode, and its first end is emitter stage, and the second end is colelctor electrode, and control end is base stage.Second switch pipe Q2 is NPN type triode, and its first end is colelctor electrode, and the second end is emitter stage, and control end is base stage.In other embodiments, the switching tubes such as MOSFET or IGBT are can use to replace audion.
High voltage conduction circuit 23 includes the 3rd switching tube Q3, the 4th switching tube Q4 and the 5th switching tube Q5.First end of the 4th switching tube Q4 is connected with power input 100, and its second end is electrically connected with the input of three-terminal voltage-stabilizing chip U1 by resistance, and its first end controlling end and the 3rd switching tube Q3 is connected.The second end ground connection of the 3rd switching tube Q3, it controls end and is connected with the outfan of testing circuit 21 and the control end of the 5th switching tube Q5.First end of the 5th switching tube Q5 is connected with power input 100, its second end ground connection.3rd and the 5th switching tube Q3, Q5 is more than the second terminal voltage in its first terminal voltage, and it controls conducting when end is high level.3rd switch Q3 is more than the second terminal voltage in its first terminal voltage, and it controls conducting when end is low level.It should be understood that the 3rd and the 5th switching tube Q3, Q5 all can use NPN type triode, its first end is colelctor electrode, and the second end is emitter stage, and control end is base stage.4th switching tube Q4 can use PNP type triode, and its first end is emitter stage, and the second end is colelctor electrode, and control end is base stage.In other embodiments, the switching tubes such as MOSFET or IGBT are can use to replace audion.
The operation principle of this vehicle-mounted low pressure difference linear voltage regulator 100 is as follows: by arranging the first resistance R1 and the resistance of the second resistance R2, to meet the 3rd switching tube Q3 in power input 100 input voltage vin less than being not turned on when expecting, being greater than or equal to expection, such as, turn on during 10V.
So, when power input 100 input voltage is greater than or equal to 10V, 3rd switching tube Q3, the 5th switching tube Q5 conducting, now the 4th switching tube Q4 conducting, first switching tube Q1, second switch pipe Q2 end, stabilivolt Z1 in compensation voltage stabilizing module 24 and the 4th resistance R4 collaborative work, the power supply of outfan 200 is now powered by LDO voltage stabilizer 1 and manostat Z1.
When power input 100 input voltage is less than 10V, 3rd switching tube Q3, the 5th switching tube Q5 cut-off, now the 4th switching tube Q4 cut-off, first switching tube Q1, second switch pipe Q2 turn on, now, the voltage of power input 100 will bear directly against compensation voltage stabilizing module 24, stabilivolt Z1 and the 3rd resistance R3 collaborative work, is individually for outfan 200 and powers.In actual test, three-terminal voltage-stabilizing chip U1 uses model to be the chip of L7885C, suitably adjusts the 3rd resistance R3 and the value of stabilivolt Z1, can meet input voltage vin be 9V outfan 200 output voltage Vout be the burning voltage of 8.5V.
Above in conjunction with accompanying drawing, embodiments of the present invention are explained in detail, but the present invention is not limited to above-mentioned embodiment, in the ken that those of ordinary skill in the art are possessed, it is also possible to various changes can be made on the premise of without departing from present inventive concept.
Claims (8)
1. a vehicle-mounted low differential voltage linear voltage stabilizer circuit, including a three-terminal voltage-stabilizing chip, the input of described three-terminal voltage-stabilizing chip is connected with power input, also by capacity earth by resistance element；The outfan of described three-terminal voltage-stabilizing chip is used for powering to the load, and it passes through capacity earth；Characterized by further comprising a low-voltage compensation circuit, comprising:
Testing circuit, it detects the input voltage of described power input, described input voltage is converted to the first voltage；
High voltage conduction circuit, it is connected between the input of described power input and three-terminal voltage-stabilizing chip, and it is conducting when described first voltage is more than or equal to the first preset value, otherwise cut-off is to stop to three-terminal voltage-stabilizing chip power supply；
Low pressure turning circuit, it is conducting when described first voltage is less than described first preset value, conducts described input voltage to its outfan；And
Compensation voltage stabilizing module, it include negative electrode be connected with described load, the stabilivolt of plus earth, the negative electrode of this stabilivolt is connected with the outfan of described low pressure turning circuit and the outfan of three-terminal voltage-stabilizing chip respectively also by two resistance elements.
Vehicle-mounted low differential voltage linear voltage stabilizer circuit the most as claimed in claim 1, it is characterized in that: described testing circuit includes the first resistance and the second resistance, after described first and second resistant series, one end is connected with described power input, other end ground connection, the junction point of the first and second resistance is as the outfan of testing circuit.
Vehicle-mounted low differential voltage linear voltage stabilizer circuit the most as claimed in claim 1, it is characterized in that: described low pressure turning circuit includes the first switching tube and second switch pipe, first end of the first switching tube is connected with described power input, its second end is connected with the negative electrode of described stabilivolt by described resistance element, and it controls end and is connected with the first end of second switch pipe；Second end ground connection of described second switch pipe, it controls end and is connected with high voltage conduction circuit；The voltage of the first end of described first switching tube is higher than its second terminal voltage, and controls conducting when terminal voltage is low level；Described second switch pipe the voltage of the first end higher than its second terminal voltage, and control conducting when terminal voltage is high level.
Vehicle-mounted low differential voltage linear voltage stabilizer circuit the most as claimed in claim 3, it is characterised in that: described first switching tube is PNP type triode, and its first end is emitter stage, and the second end is colelctor electrode, and control end is base stage；Described second switch pipe is NPN type triode, and its first end is colelctor electrode, and the second end is emitter stage, and control end is base stage.
Vehicle-mounted low differential voltage linear voltage stabilizer circuit the most as claimed in claim 3, it is characterised in that: described high voltage conduction circuit includes the 3rd switching tube, the 4th switching tube and the 5th switching tube；First end of the 4th switching tube is connected with described power input, and its second end electrically connects with the input of three-terminal voltage-stabilizing chip, and its first end controlling end and the 3rd switching tube is connected；Second end ground connection of described 3rd switching tube, it controls end and is connected with the outfan of testing circuit and the control end of the 5th switching tube；First end of the 5th switching tube is connected with power input, its second end ground connection；Described 3rd and the 5th switching tube is more than the second terminal voltage in its first terminal voltage, and it controls conducting when end is high level；Described 3rd switching tube is more than the second terminal voltage in its first terminal voltage, and it controls conducting when end is low level.
Vehicle-mounted low differential voltage linear voltage stabilizer circuit the most as claimed in claim 5, it is characterised in that: described 3rd and the 5th switching tube is NPN type triode, and its first end is colelctor electrode, and the second end is emitter stage, and control end is base stage；Described 4th switching tube is PNP type triode, and its first end is emitter stage, and the second end is colelctor electrode, and control end is base stage.
7. the vehicle-mounted low differential voltage linear voltage stabilizer circuit as according to any one of claim 1-6 item, it is characterised in that: described resistance element includes resistance.
8. the low-voltage compensation circuit for vehicle-mounted low differential voltage linear voltage stabilizer circuit, it is characterised in that it uses low-voltage compensation circuit as claimed in claim 1.
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| CN201310610600.5A CN104679087B (en) | 2013-11-26 | 2013-11-26 | Vehicle-mounted low differential voltage linear voltage stabilizer circuit and low-voltage compensation circuit thereof |
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| CN201310610600.5A CN104679087B (en) | 2013-11-26 | 2013-11-26 | Vehicle-mounted low differential voltage linear voltage stabilizer circuit and low-voltage compensation circuit thereof |
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| JP2018186665A (en) * | 2017-04-27 | 2018-11-22 | 日本精機株式会社 | Vehicle power circuit and power supply method |
| CN107104578B (en) * | 2017-05-17 | 2019-05-07 | 江苏理工学院 | A kind of linear power supply classification adjustment output circuit |
| CN109088540B (en) * | 2018-08-31 | 2019-05-14 | 西北农林科技大学 | A kind of design method of the vehicle-mounted wide input auxiliary voltage regulator circuit of new-energy automobile |
| CN109194109A (en) * | 2018-09-27 | 2019-01-11 | 广州金升阳科技有限公司 | A kind of compensation circuit |
| CN110247814B (en) * | 2019-02-02 | 2021-06-01 | 国网浙江省电力有限公司湖州供电公司 | Portable handheld device for debugging network equipment of power system |
| CN111964687A (en) * | 2020-08-19 | 2020-11-20 | 昆明学院 | Device capable of recording step under low electric quantity state |
| CN112486233A (en) * | 2020-11-26 | 2021-03-12 | 惠州市德赛西威汽车电子股份有限公司 | Circuit for preventing LDO from outputting peak voltage |
| CN112631357B (en) * | 2020-12-22 | 2022-10-21 | 博科能源系统(深圳)有限公司 | DC voltage-stabilized power supply circuit |
| CN114296501A (en) * | 2021-12-23 | 2022-04-08 | 深圳市元征科技股份有限公司 | Power supply voltage adjusting system |
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| JP5609547B2 (en) * | 2010-10-29 | 2014-10-22 | 日本精機株式会社 | Vehicle power circuit |
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| CN2757400Y (en) * | 2004-12-29 | 2006-02-08 | 长春一汽启明信息技术股份有限公司 | Power module special for automobile |
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