CN113394969A - Negative voltage generation circuit applied to acquisition terminal - Google Patents

Negative voltage generation circuit applied to acquisition terminal Download PDF

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Publication number
CN113394969A
CN113394969A CN202011531500.XA CN202011531500A CN113394969A CN 113394969 A CN113394969 A CN 113394969A CN 202011531500 A CN202011531500 A CN 202011531500A CN 113394969 A CN113394969 A CN 113394969A
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CN
China
Prior art keywords
circuit
triode
resistor
capacitor
negative voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN202011531500.XA
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Chinese (zh)
Inventor
葛玉磊
苏超
孙德辉
刘丰羽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Topscomm Communication Co Ltd
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Qingdao Topscomm Communication Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qingdao Topscomm Communication Co Ltd filed Critical Qingdao Topscomm Communication Co Ltd
Priority to CN202011531500.XA priority Critical patent/CN113394969A/en
Publication of CN113394969A publication Critical patent/CN113394969A/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Power Conversion In General (AREA)

Abstract

The invention discloses a negative voltage generating circuit applied to an acquisition terminal, which comprises a driving circuit, a logic control circuit and a charge and discharge circuit for charging and discharging a capacitor; the ends a and b of the drive circuit are respectively connected with the ends c and d of the logic control circuit, and the end e of the logic control circuit is connected with the input end f of the charge and discharge circuit. The invention uses the discrete elements such as the triode, the resistor, the capacitor and the like to replace the integrated circuit to build the negative voltage generating circuit, has lower cost, flexible use and stronger load carrying capacity of the circuit, and can stop working when the control chip fails and continuously outputs high or low level, thereby effectively protecting the rear-stage circuit.

Description

Negative voltage generation circuit applied to acquisition terminal
Technical Field
The invention relates to the technical field of linear power supplies, in particular to a negative voltage generating circuit applied to an acquisition terminal.
Background
In the circuit design of the acquisition terminal, negative voltage is applied to the CMOS interface communication. At present, an integrated circuit is often adopted to design a negative voltage generating circuit in an acquisition terminal, the integrated circuit is simple to use, but the defects are obvious, once a chip fails, faults such as short circuit and the like can be caused, equipment is damaged, the cost is relatively high, and meanwhile, the negative voltage generating circuit adopting the integrated circuit is weaker in load carrying capacity.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the invention provides the negative voltage generating circuit applied to the acquisition terminal, discrete elements such as a triode, a resistor, a capacitor and the like are used for replacing an integrated circuit to build the negative voltage generating circuit, the cost is lower, the use is flexible, the load capacity of the circuit is stronger, when a control chip breaks down and continuously outputs high or low level, the circuit stops working, and the rear-stage circuit is effectively protected.
The purpose of the invention can be realized by the following technical scheme:
a negative voltage generating circuit applied to an acquisition terminal comprises a driving circuit, a logic control circuit and a charging and discharging circuit;
the connection relationship is as follows: the ends a and b of the drive circuit are respectively connected with the ends c and d of the logic control circuit, and the end e of the logic control circuit is connected with the input end f of the charge and discharge circuit.
Furthermore, the driving circuit comprises a PWM input end CTRL and a current limiting resistor R5NPN triode T1Resistance R2Input terminal V of DC voltagein；
The connection relationship is as follows: input terminal CTRL and current limiting resistor R5Is connected to the left end of R5Right end of and triode T1Is connected with the base electrode of the direct current voltage source input end VinAnd a resistor R2Is connected to the upper end of a resistor R2Lower end of and triode T1Is connected with the collector of the triode T1The emitter of (2) is grounded.
Furthermore, the logic control circuit comprises input terminals c and d and a resistor R1、R3、R4、R6PNP triode T2NPN triode T3；
The connection relationship is as follows: resistance R1Is connected to input terminal c, R1Right end of (3) and a resistor R3Upper end of triode T2Is transmitted byPole connected, resistor R3Lower end of and triode T2Base electrode and resistor R4Is connected with the right end of the resistor R4Left end and input end d, resistor R6Is connected to the left end of the resistor R6Right end of and triode T3Is connected with the base electrode of the triode T2Collector and triode T3Is connected with the collector of the triode T3The emitter of (2) is grounded.
Furthermore, the charge and discharge circuit is used for realizing charge and discharge of the capacitor and comprises an input end f and a capacitor C1、C2Diode D1、D2And an output end Vout；
The connection relationship is as follows: input terminal f and capacitor C1Is connected to the left end of the capacitor C1Right end of and diode D1Anode of (2), diode D2Is connected to the cathode of a diode D1Negative electrode of (1) and capacitor C2Is connected to ground, diode D2And the upper end and the output end V of the capacitor C2outAre connected.
The invention has the beneficial technical effects that: discrete elements such as a triode, a resistor, a capacitor and the like are used for replacing an integrated circuit to build the negative voltage generating circuit. The circuit is controlled by PWM signal, and when the PWM signal is at high level, the triode T1Conducting, dividing voltage by DC voltage source via resistor, and controlling triode T2Conducting, the DC voltage source passes through the diode D1Capacitor C1Charging; when the PWM is at low level, the triode T3On, the capacitance C1Through diode D2Capacitor C2Charging, a negative voltage with respect to ground plane can be detected at the output. The invention has the advantages of lower cost, flexible use and stronger load capacity of the circuit, and when the control chip fails and continuously outputs high or low level, the circuit stops working, thereby effectively protecting the subsequent circuit.
Drawings
FIG. 1 is an overall circuit schematic of the present invention;
FIG. 2 is a schematic diagram of the driving circuit of the present invention;
FIG. 3 is a schematic diagram of the logic control circuit of the present invention;
fig. 4 is a schematic diagram of the charge and discharge circuit according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
As shown in fig. 1, a negative voltage generating circuit applied to an acquisition terminal includes a driving circuit, a logic control circuit, and a charging/discharging circuit;
the driving circuit comprises a PWM input end CTRL and a current limiting resistor R5NPN triode T1Resistance R2Input terminal V of DC voltagein；
The logic control circuit comprises input terminals c and d, and a resistor R1、R3、R4、R6PNP triode T2NPN triode T3；
The charge-discharge circuit is used for realizing charge-discharge of a capacitor and comprises an input end f and a capacitor C1、C2Diode D1、D2And an output end Vout；
The ends a and b of the drive circuit are respectively connected with the ends c and d of the logic control circuit, and the end e of the logic control circuit is connected with the input end f of the charge and discharge circuit.
For the driving circuit, input CTRL and current limiting resistor R5Is connected to the left end of R5Right end of and triode T1Is connected with the base electrode of the direct current voltage source input end VinAnd a resistor R2Is connected to the upper end of a resistor R2Lower end of and triode T1Is connected with the collector of the triode T1Is grounded as shown in fig. 2.
When the PWM is at high level, the triode T1Conducting, and the potential of the point b is low level; when the PWM is at low level, the triode T1And the potential at the point b is pulled high.
For logic control circuits, resistorsR1Is connected to input terminal c, R1Right end of (3) and a resistor R3Upper end of triode T2Is connected to the emitter of the resistor R3Lower end of and triode T2Base electrode and resistor R4Is connected with the right end of the resistor R4Left end and input end d, resistor R6Is connected to the left end of the resistor R6Right end of and triode T3Is connected with the base electrode of the triode T2Collector and triode T3Is connected with the collector of the triode T3Is grounded as shown in fig. 3.
For the charge-discharge circuit, the input terminal f and the capacitor C1Is connected to the left end of the capacitor C1Right end of and diode D1Anode of (2), diode D2Is connected to the cathode of a diode D1Negative electrode of (1) and capacitor C2Is connected to ground, diode D2And the upper end and the output end V of the capacitor C2outConnected as shown in fig. 4.
When PWM is high level, because d point potential is low level, after resistance voltage division, triode T2Conducting triode T3Is turned off, a current path V is formedin-R1-T2-C1-D1GND, DC voltage source via diode D1Capacitor C1Charging; when the PWM is at low level, the triode T is at high level due to the d-point potential3Conduction, T2Is turned off, and a current loop C is formed1-T3-C2-D2-C1Since the voltage across the capacitor cannot change abruptly, the capacitor C is provided with a capacitor C2Can detect a negative voltage with respect to the ground plane.
The above-mentioned embodiments are illustrative of the specific embodiments of the present invention, and are not restrictive, and those skilled in the relevant art can make various changes and modifications to obtain corresponding equivalent technical solutions without departing from the spirit and scope of the present invention, so that all equivalent technical solutions should be included in the scope of the present invention.

Claims (4)

1. A negative voltage generating circuit applied to an acquisition terminal is characterized by comprising a driving circuit, a logic control circuit and a charging and discharging circuit;
the connection relationship is as follows: the ends a and b of the drive circuit are respectively connected with the ends c and d of the logic control circuit, and the end e of the logic control circuit is connected with the input end f of the charge and discharge circuit.
2. The negative voltage generating circuit as claimed in claim 1, wherein the driving circuit comprises a PWM input CTRL, a current limiting resistor R5NPN triode T1Resistance R2Input terminal V of DC voltagein；
The connection relationship is as follows: input terminal CTRL and current limiting resistor R5Is connected to the left end of R5Right end of and triode T1Is connected with the base electrode of the direct current voltage source input end VinAnd a resistor R2Is connected to the upper end of a resistor R2Lower end of and triode T1Is connected with the collector of the triode T1The emitter of (2) is grounded.
3. The negative voltage generating circuit as claimed in claim 1, wherein the logic control circuit comprises input terminals c and d, and a resistor R1、R3、R4、R6PNP triode T2NPN triode T3；
The connection relationship is as follows: resistance R1Is connected to input terminal c, R1Right end of (3) and a resistor R3Upper end of triode T2Is connected to the emitter of the resistor R3Lower end of and triode T2Base electrode and resistor R4Is connected with the right end of the resistor R4Left end and input end d, resistor R6Is connected to the left end of the resistor R6Right end of and triode T3Is connected with the base electrode of the triode T2Collector and triode T3Is connected with the collector of the triode T3The emitter of (2) is grounded.
4. The negative voltage generating circuit as claimed in claim 1, wherein the charge/discharge circuit is used for charging/discharging a capacitor, and comprises an input terminal f and a capacitor C1、C2Diode D1、D2And an output end Vout；
The connection relationship is as follows: input terminal f and capacitor C1Is connected to the left end of the capacitor C1Right end of and diode D1Anode of (2), diode D2Is connected to the cathode of a diode D1Negative electrode of (1) and capacitor C2Is connected to ground, diode D2And the upper end and the output end V of the capacitor C2outAre connected.
CN202011531500.XA 2020-12-22 2020-12-22 Negative voltage generation circuit applied to acquisition terminal Withdrawn CN113394969A (en)

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Application Number Priority Date Filing Date Title
CN202011531500.XA CN113394969A (en) 2020-12-22 2020-12-22 Negative voltage generation circuit applied to acquisition terminal

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Application Number Priority Date Filing Date Title
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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1118416A (en) * 1997-06-27 1999-01-22 Sanyo Electric Co Ltd Negative voltage generator
CN101414787A (en) * 2007-10-17 2009-04-22 鸿富锦精密工业（深圳）有限公司 Circuit for generating negative voltage
US20090154207A1 (en) * 2007-12-14 2009-06-18 Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. Negative voltage generating circuit
CN208539785U (en) * 2018-07-26 2019-02-22 东莞市动力之星电子有限公司 A kind of negative voltage regulator circuit
CN208739028U (en) * 2018-07-26 2019-04-12 东莞市动力之星电子有限公司 A kind of circuit of control negative pressure output
JP2019134639A (en) * 2018-02-01 2019-08-08 京セラドキュメントソリューションズ株式会社 Electronic apparatus
CN110617866A (en) * 2019-09-18 2019-12-27 珠海格力电器股份有限公司 Frequency signal generating circuit and liquid level detection circuit
US10548190B1 (en) * 2019-04-25 2020-01-28 Microsoft Technology Licensing, Llc Negative voltage rail
CN212063836U (en) * 2020-05-19 2020-12-01 石家庄泽润科技有限公司 Chip positive and negative power supply generator

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH1118416A (en) * 1997-06-27 1999-01-22 Sanyo Electric Co Ltd Negative voltage generator
CN101414787A (en) * 2007-10-17 2009-04-22 鸿富锦精密工业（深圳）有限公司 Circuit for generating negative voltage
US20090154207A1 (en) * 2007-12-14 2009-06-18 Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. Negative voltage generating circuit
JP2019134639A (en) * 2018-02-01 2019-08-08 京セラドキュメントソリューションズ株式会社 Electronic apparatus
CN208539785U (en) * 2018-07-26 2019-02-22 东莞市动力之星电子有限公司 A kind of negative voltage regulator circuit
CN208739028U (en) * 2018-07-26 2019-04-12 东莞市动力之星电子有限公司 A kind of circuit of control negative pressure output
US10548190B1 (en) * 2019-04-25 2020-01-28 Microsoft Technology Licensing, Llc Negative voltage rail
CN110617866A (en) * 2019-09-18 2019-12-27 珠海格力电器股份有限公司 Frequency signal generating circuit and liquid level detection circuit
CN212063836U (en) * 2020-05-19 2020-12-01 石家庄泽润科技有限公司 Chip positive and negative power supply generator

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Application publication date: 20210914

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