CN103532371A - Negative voltage generating circuit - Google Patents
Negative voltage generating circuit Download PDFInfo
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- CN103532371A CN103532371A CN201210226511.6A CN201210226511A CN103532371A CN 103532371 A CN103532371 A CN 103532371A CN 201210226511 A CN201210226511 A CN 201210226511A CN 103532371 A CN103532371 A CN 103532371A
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Abstract
The present invention provides a negative voltage generating circuit which comprises the following components: a voltage input end, a pulse signal generating circuit, a voltage multiplexing circuit, a converting circuit, a voltage stabilizer and a voltage output end. The pulse signal generating circuit generates a pulse signal with an amplitude that is the amplitude of the input voltage according to the input voltage of the voltage input end to the voltage multiplexing circuit. The voltage multiplexing circuit multiplexes the input voltage to a second voltage according to the pulse signal and outputs the second voltage to the converting circuit. The converting circuit converts the second voltage to a first negative voltage and outputs the first negative voltage to the voltage stabilizer. The voltage stabilizer outputs a second negative voltage to the voltage output end. Furthermore the amplitude of the second negative voltage is same with that of the input voltage. The negative voltage generating circuit can output the negative voltage with stable output amplitude.
Description
Technical field
The present invention relates to a kind of circuit for generating negative voltage.
Background technology
Along with the develop rapidly of modern electronic technology and high speed very lagre scale integrated circuit (VLSIC), increasing electronic system needs both positive and negative voltage to work, as operational amplifier and computer serial ports etc. all needs negative voltage to work.Also increasing to the demand of the negative voltage power supply of stable output, but voltage stabilization, simple, the lower-cost negative voltage circuit of circuit can be provided but seldom.
Summary of the invention
In view of this, be necessary to provide a kind of voltage stabilization, the simple circuit for generating negative voltage of circuit can be provided.
The invention provides a kind of circuit for generating negative voltage, it comprises voltage input end, pulse signal generating circuit, voltage-multiplying circuit, change-over circuit, pressurizer and voltage output end.The pulse signal that this pulse signal generating circuit is this input voltage according to the input voltage generation amplitude of this voltage input end is to this voltage-multiplying circuit.This voltage-multiplying circuit is second voltage according to this pulse signal by this input voltage multiplication of voltage and exports this change-over circuit to.This change-over circuit is converted to this second voltage the first negative voltage and exports this pressurizer to, and this pressurizer is exported the second negative voltage to this voltage output end, and the amplitude of this second negative voltage is identical with the amplitude of this input voltage.
Compared to prior art, circuit for generating negative voltage of the present invention is through the negative voltage of voltage-multiplying circuit, change-over circuit and the exportable amplitude stability of pressurizer.
Accompanying drawing explanation
Fig. 1 is circuit for generating negative voltage one better embodiment schematic diagram of the present invention.
The voltage waveform view of each node when Fig. 2 is the circuit for generating negative voltage work shown in Fig. 1.
Main element symbol description
| Circuit for generating |
10 |
| |
101 |
| Pulse |
103 |
| Voltage-multiplying |
105 |
| Change-over |
107 |
| |
109 |
| |
111 |
| The first resistance | R1 |
| The second resistance | R2 |
| The 3rd resistance | R3 |
| The 4th resistance | R4 |
| The 5th resistance | R5 |
| The 6th resistance | R6 |
| The first field-effect transistor | Q1 |
| The first electric capacity | C1 |
| The second electric capacity | C2 |
| The 3rd electric capacity | C3 |
| The 4th electric capacity | C4 |
| The 5th electric capacity | C5 |
| The 6th electric capacity | C6 |
| The 7th electric capacity | C7 |
| Trigger | U1 |
| Grounding pin | GND |
| Power pins | VCC |
| Output pin | VO |
| Low triggering pin | TR |
| The high pin that triggers | TH |
| Zero clearing pin | RE |
| Control voltage pin | VC |
| Electric discharge pin | DS |
| Input | Vin |
| Output | Vout |
| Earth terminal | Gnd |
Following embodiment further illustrates the present invention in connection with above-mentioned accompanying drawing.
Embodiment
Below in conjunction with accompanying drawing, the present invention is done to concrete introduction.
Refer to Fig. 1, Fig. 1 is a better embodiment schematic diagram of circuit for generating negative voltage 10 of the present invention.This circuit for generating negative voltage 10 comprises voltage input end 101, pulse signal generating circuit 103, voltage-multiplying circuit 105, change-over circuit 107, pressurizer 109 and voltage output end 111.The pulse signal that this pulse signal generating circuit 103 is this input voltage according to the input voltage generation amplitude of this voltage input end 101 is to this voltage-multiplying circuit 105.This voltage-multiplying circuit 105 is second voltage according to this pulse signal by this input voltage multiplication of voltage and exports this change-over circuit 107 to.This change-over circuit 107 is converted to negative voltage by this second voltage and exports this pressurizer 109 to, and these pressurizer 109 output second negative voltages are to this voltage output end 111, and the amplitude of this second negative voltage is identical with the amplitude of this input voltage.
Particularly, this pulse signal generating circuit 103 comprises trigger U1, the first resistance R 1, the second resistance R 2, the first capacitor C 1 and the second capacitor C 2.This trigger U1 comprises grounding pin GND, power pins VCC, output pin VO, low triggering pin TR, high pin TH, zero clearing pin RE, control voltage pin VC and the electric discharge pin DS of triggering.This power pins VCC, this zero clearing pin RE are all connected to this voltage input end 101.This grounding pin GND ground connection.This controls voltage pin VC through these the second capacitor C 2 ground connection.This low triggering pin TR, this height trigger pin TH all through this first capacitor C 1 ground connection.This low triggering pin TR, this height trigger pin TH and also through this second resistance R 2, the first resistance R 1, are connected with this voltage input end 101.This electric discharge pin DS is connected to the node between this first resistance R 1 and this second resistance R 2.This output pin VO is for output pulse signal, and the frequency of this pulse signal is determined by this first resistance R 1, the second resistance R 2 and the first capacitor C 1.In present embodiment, this trigger U1 is 555 timers.
This voltage-multiplying circuit 105 comprises the 3rd capacitor C 3, the first diode D1, the second diode D2, the 3rd resistance R 3, the 4th capacitor C 4 and the 4th resistance R 4.One end of the 3rd capacitor C 3 is connected with the output pin VO of this trigger U1, and the other end of the 3rd capacitor C 3 is connected in series with this second diode D2, the 4th resistance R 4.This voltage input end 101 is connected to the node between the 3rd capacitor C 3 and this second diode D2 through this first diode D1.This second diode D2 is respectively through the 3rd resistance R 3,4 two groundings of the 4th capacitor C.The 3rd capacitor C 3 is used for discharging and recharging for electrochemical capacitor.The 3rd resistance R 3, the 4th resistance R 4 are current-limiting resistance.The 4th capacitor C 4 is for filtering.
See also Fig. 2, the voltage waveform view of each node when Fig. 2 is the circuit for generating negative voltage work shown in Fig. 1.In present embodiment, this input voltage is 12V.The square-wave pulse signal A that this trigger U1 output pin VO output amplitude is 12V, the voltage waveform B of the 3rd capacitor C 3 positive terminal outputs.
At T1, in the time period, the pulse signal A of this trigger U1 output pin VO output is low level, and input voltage is the 3rd capacitor C 3 chargings through this voltage input end 101, the first diode D1.When the 3rd capacitor C 3 is full of electricity, the voltage difference at the 3rd capacitor C 3 two ends is the poor of the input voltage 12V of this voltage input end 101 and the pressure drop on this first diode D1.Now, the magnitude of voltage of the 3rd capacitor C 3 positive terminals is about 12V.
At T2, in the time period, the pulse signal A of this trigger U1 output pin VO output is high level, and the 3rd capacitor C 3 cathode voltages are input voltage.Because electric capacity has the characteristic that voltage can not suddenly change, so when the cathode voltage of the 3rd capacitor C 3 and this trigger U1 is input voltage, the cathode voltage value of the 3rd capacitor C 3 is about 2 times of this input voltage.Definition now the 3rd capacitor C 3 cathode voltages is second voltage.In the present embodiment, this second voltage amplitude is about 24V.
This change-over circuit 107 comprises the 5th resistance R 5, the first field-effect transistor Q1, the 5th capacitor C 5, the 3rd diode D3, the 4th diode D4, the 6th resistance R 6, the 6th capacitor C 6.The grid of this first field-effect transistor Q1 is connected with the output pin VO of this trigger U1 through the 5th resistance R 5.The grounded drain of this first field-effect transistor Q1.The source electrode of this first field-effect transistor Q1 is connected with the 4th resistance R 4.The source electrode of this first field-effect transistor Q1 is connected with this pressurizer 109 through negative electrode, the anode of the 5th capacitor C 5, the 3rd diode D3.The 4th diode D4 is connected between the node and ground between the 5th capacitor C 5 and the 4th diode D4.The 3rd diode D3 is also respectively through the 6th resistance R 6,6 two groundings of the 6th capacitor C.The 5th capacitor C 5 is electrochemical capacitor, for discharging and recharging.
This pressurizer 109 is three terminal regulator, and it comprises input Vin, output end vo ut and earth terminal Gnd.The anodic bonding of this input Vin and the 4th diode D4.This earth terminal Gnd ground connection.This output end vo ut is connected with this voltage output end 111.This output end vo ut is also through one the 7th capacitor C 7 ground connection.The 7th capacitor C 7 is for filtering.In present embodiment, this pressurizer 109 is LM7912.
Please again consult Fig. 2, the voltage waveform view C of the 5th capacitor C 5 positive terminals, the voltage waveform view D of the 5th capacitor C 5 negative pole ends.
At T1 in the time period, the pulse signal A of this trigger U1 output pin VO output is low level, this first field-effect transistor Q1 cut-off, the 24V second voltage that is about of these voltage-multiplying circuit 105 outputs is the 5th capacitor C 5 chargings, when the 5th capacitor C 5 is full of electricity, the magnitude of voltage at the 5th capacitor C 5 two ends is the poor of pressure drop on this second voltage and the 4th diode D4.
At T2 in the time period, the pulse signal A of this trigger U1 output pin VO output is high level, this first field-effect transistor Q1 conducting, the anodal termination of the 5th capacitor C 5, because electric capacity has the characteristic that voltage can not suddenly change, when the cathode voltage of the 5th capacitor C 5 is 0V, the cathode voltage of the 5th capacitor C 5 is negative value, therefore the 5th capacitor C 5 is by the 6th resistance R 6 electric discharges, now the input voltage of the input Vin of this pressurizer 109 is negative voltage, and its absolute value approximates this second voltage.The the second negative voltage-12V of the output end vo ut stable output of this pressurizer 109 is to this voltage output end 111.
When this trigger U1 constantly exports low and high level, the 5th capacitor C 5 is constantly in charge and discharge state, when the pulse signal of this trigger U1 output is high level, the 4th capacitor C 4 is by the 6th resistance R 6 electric discharges, because the 6th capacitor C 6 is in parallel with the 6th resistance R 6, when therefore the 5th capacitor C 5 is discharged, also give the 6th capacitor C 6 chargings.When the pulse signal of this trigger U1 output is low level, although the 5th capacitor C 5 can not provide negative voltage output, but the 6th capacitor C 6 has been charged between a upper high period, now the 6th capacitor C 6 is exported negative voltages, thereby has guaranteed the stability of the input Vin input negative voltage of this pressurizer 109.
Above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to better enforcement, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not depart from the spirit and scope of technical solution of the present invention.
Claims (10)
1. a circuit for generating negative voltage, it comprises voltage input end, pulse signal generating circuit, voltage-multiplying circuit, change-over circuit, pressurizer and voltage output end; The pulse signal that this pulse signal generating circuit is this input voltage according to the input voltage generation amplitude of this voltage input end is to this voltage-multiplying circuit; This voltage-multiplying circuit is second voltage according to this pulse signal by this input voltage multiplication of voltage and exports this change-over circuit to; This change-over circuit is converted to this second voltage the first negative voltage and exports this pressurizer to, and this pressurizer is exported the second negative voltage to this voltage output end, and the amplitude of this second negative voltage is identical with the amplitude of this input voltage.
2. circuit for generating negative voltage as claimed in claim 1, is characterized in that, this pulse signal is the square-wave pulse signal that low and high level replaces mutually.
3. circuit for generating negative voltage as claimed in claim 2, is characterized in that, this pulse-generating circuit comprises trigger, the first resistance, the second resistance, the first electric capacity and the second electric capacity; This trigger comprises grounding pin, power pins, output pin, low triggering pin, high pin, zero clearing pin, control voltage pin and the electric discharge pin of triggering; This power pins, this zero clearing pin are all connected to this voltage input end; This grounding pin ground connection, this controls voltage pin through this second capacity earth, this low triggering pin, this height trigger pin all through this first capacity earth, and this low triggering pin, this height trigger pin and also through this second resistance, the first resistance, be connected with this voltage input end; This electric discharge pin is connected to the node between this first resistance and this second resistance, and this output pin is for output pulse signal.
4. circuit for generating negative voltage as claimed in claim 3, is characterized in that, this trigger is 555 timers.
5. circuit for generating negative voltage as claimed in claim 3, is characterized in that, this voltage-multiplying circuit comprises the 3rd electric capacity, the first diode, the second diode; The 3rd one end of electric capacity and the output pin of this trigger are connected, and the other end of the 3rd electric capacity is connected with this change-over circuit through this second diode; This voltage input end is connected to the node between the 3rd electric capacity and this second diode through this first diode.
6. circuit for generating negative voltage as claimed in claim 5, is characterized in that, the 3rd electric capacity is electrochemical capacitor, for discharging and recharging.
7. circuit for generating negative voltage as claimed in claim 5, is characterized in that, this voltage-multiplying circuit also comprises the 4th electric capacity, and this second diode is through the 4th capacity earth.
8. circuit for generating negative voltage as claimed in claim 5, is characterized in that, this change-over circuit comprises the 5th resistance, the first field-effect transistor, the 5th electric capacity, the 3rd diode, the 6th resistance, the 6th electric capacity; The grid of this first field-effect transistor is connected with the output of this trigger through the 5th resistance, the grounded drain of this first field-effect transistor; The source electrode of this first field-effect transistor is connected with this voltage-multiplying circuit, and the source electrode of this first field-effect transistor is connected with this pressurizer through negative electrode, the anode of the 5th electric capacity, the 3rd diode; The 4th diode is also respectively through the 6th resistance, two groundings of the 6th electric capacity.
9. circuit for generating negative voltage as claimed in claim 8, is characterized in that, the 5th electric capacity is electrochemical capacitor, for discharging and recharging.
10. circuit for generating negative voltage as claimed in claim 8, is characterized in that, this change-over circuit also comprises the 4th diode, and the 4th diode is connected between the node and ground between the 5th electric capacity and the 3rd diode.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210226511.6A CN103532371A (en) | 2012-07-03 | 2012-07-03 | Negative voltage generating circuit |
| TW101124147A TW201404020A (en) | 2012-07-03 | 2012-07-05 | Negative voltage generating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210226511.6A CN103532371A (en) | 2012-07-03 | 2012-07-03 | Negative voltage generating circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103532371A true CN103532371A (en) | 2014-01-22 |
Family
ID=49934136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210226511.6A Pending CN103532371A (en) | 2012-07-03 | 2012-07-03 | Negative voltage generating circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN103532371A (en) |
| TW (1) | TW201404020A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105529917A (en) * | 2016-01-21 | 2016-04-27 | 中山芯达电子科技有限公司 | High efficiency fast voltage generating circuit |
| CN106200735A (en) * | 2015-01-13 | 2016-12-07 | 力晶科技股份有限公司 | Negative reference voltage generating circuit and negative reference voltage produce system |
| CN106549572A (en) * | 2016-10-27 | 2017-03-29 | 昆山龙腾光电有限公司 | A kind of circuit for generating negative voltage |
-
2012
- 2012-07-03 CN CN201210226511.6A patent/CN103532371A/en active Pending
- 2012-07-05 TW TW101124147A patent/TW201404020A/en unknown
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106200735A (en) * | 2015-01-13 | 2016-12-07 | 力晶科技股份有限公司 | Negative reference voltage generating circuit and negative reference voltage produce system |
| CN106200735B (en) * | 2015-01-13 | 2018-03-06 | 力晶科技股份有限公司 | Negative reference voltage generating circuit and negative reference voltage generation system |
| CN105529917A (en) * | 2016-01-21 | 2016-04-27 | 中山芯达电子科技有限公司 | High efficiency fast voltage generating circuit |
| CN106549572A (en) * | 2016-10-27 | 2017-03-29 | 昆山龙腾光电有限公司 | A kind of circuit for generating negative voltage |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201404020A (en) | 2014-01-16 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140122 |