CN106100322B - Multipath high-precision power supply circuit - Google Patents
Multipath high-precision power supply circuit Download PDFInfo
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- CN106100322B CN106100322B CN201610461237.9A CN201610461237A CN106100322B CN 106100322 B CN106100322 B CN 106100322B CN 201610461237 A CN201610461237 A CN 201610461237A CN 106100322 B CN106100322 B CN 106100322B
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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
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/008—Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a multipath high-precision power supply circuit which consists of a booster circuit, a negative voltage circuit, a booster and voltage reduction circuit, a constant current source circuit and a reference source circuit and can generate +5V, -5V, +3V, high-precision +3.6V and high-precision-3.6V voltages. Compared with the single-chip output of single voltage, the invention saves resources, improves the utilization efficiency of the chip, and realizes two paths of high-stability analog power supplies by using the constant current source and the reference source.
Description
Technical Field
The invention relates to the field of electromagnetic flowmeters, in particular to a multipath high-precision power supply circuit.
Background
The electromagnetic flowmeter is an instrument for measuring the flow of conductive fluid according to the electromotive force induced when the conductive fluid passes through an externally applied magnetic field by applying an electromagnetic induction principle, is mainly applied to the measurement of the flow of industrial large-caliber pipe sections, and needs a plurality of different high-precision stable power supplies in the work of the electromagnetic flowmeter.
Disclosure of Invention
The invention aims to provide a power supply circuit applied to an electromagnetic flowmeter, which generates various voltages by using a single chip and realizes two paths of high-stability analog power supply by using a constant current source and a reference source in the circuit.
In order to achieve the above object, the technical scheme of the present invention is as follows:
a multipath high-precision power supply circuit is composed of a boost circuit, a negative voltage circuit, a boost-buck circuit, a constant current source circuit and a reference source circuit, and can generate +5V, -5V, +3V, high-precision +3.6V and high-precision-3.6V voltages, and is characterized in that:
(1) A booster circuit: the power supply circuit comprises an inductor L3, a diode D2, a capacitor C13, a resistor R9, a resistor R8 and a switching power supply chip LT1944-1LTTU, wherein the SW2 end of the switching power supply chip is connected with the anode of the diode D2 through the inductor L3, the cathode of the diode D2 is connected with the resistor R8 through the capacitor C13, one end of the resistor R9 is connected with the FB2 end of the switching power supply chip, one end of the resistor R9 is connected with the cathode of the diode D2, and +5V voltage is generated at the cathode end of the diode D2 and is calculated by Vout= (1+R9/R8) by 1.23V;
(2) Negative pressure circuit: the negative-pressure circuit is formed by a diode D3, a diode D4, a capacitor C2 and a capacitor E2, one end of an inductor L3 is connected with the positive electrode of a capacitor E1, the negative electrode of the capacitor E1 is connected with the negative electrode of the diode D3, the negative electrode of the capacitor E2 is connected with the positive electrode of the capacitor D4, the positive electrode of the capacitor E2 is connected with the negative electrode of the diode D3, the positive electrode of the diode D3 is connected with the negative electrode of the diode D4, one end of the capacitor C2 is connected with the inductor L3, one end of the capacitor C2 is connected with the positive electrode of the diode D3, the negative-pressure circuit generates negative voltage by inverting the output voltage of a booster circuit, the partial pressure of the diodes D4 and D2 is ignored, and the negative voltage with the magnitude of Vout= (1+R9/R8) is obtained at the positive electrode of D4, namely-5V;
(3) Step-up and step-down circuit: the power supply comprises an inductor L1, an inductor L2, a diode D1, a capacitor C10, a resistor R4, a resistor R6 and a switching power supply chip, wherein the output voltage can be higher or lower than the input voltage, the voltage value is calculated by Vout= (1+R4/R6). 1.23V, the positive electrode of a battery is connected with the SW1 end of the switching power supply chip through the inductor L2, meanwhile, the inductor L2 is connected with the FB1 end of the switching power supply through the capacitor C1, the diode D1 and the capacitor C10, the capacitor C1 is connected with the inductor L1 in series and grounded, the negative electrode of the diode D1 is connected with the capacitor C9 and then grounded, the capacitor C10 is connected with the FB1 end of the switching power supply in parallel with the resistor R4, and meanwhile, the capacitor C10 is connected with the resistor R6 and then grounded;
(4) Constant current source circuit: the three-level transistor Q3, the three-level transistor Q4, the resistor R10, the resistor R7, the capacitor C12, the three-level transistor Q1, the three-level transistor Q2, the resistor R1, the resistor R2 and the capacitor C3 respectively form two constant current sources, the base electrode of the three-level transistor Q3 is connected with the emitter electrode of the three-level transistor Q4, the emitter electrode of the three-level transistor Q3 is connected with the base electrode of the three-level transistor Q3 through the resistor R10, the collector electrode of the three-level transistor Q3 is connected with the base electrode of the three-level transistor Q4, one end of the capacitor C12 is connected with the collector electrode of the three-level transistor Q3 after being connected with the resistor R7 in parallel, and one end of the capacitor C12 is grounded; the base electrode of the transistor Q1 is connected with the emitter electrode of the transistor Q2, the resistor R1 is respectively connected with the emitter electrodes of the transistor Q1 and the transistor Q2, the resistor R2 is connected with the capacitor C3 in parallel, the other end of the resistor is grounded, one end of the resistor is connected with the collector electrode of the transistor Q1, the output current is respectively determined by the emitter voltages of the base electrode of the transistor Q3, the emitter voltages of the base electrodes of the resistor R10 and the transistor Q1 and R1 and is respectively equal to 0.7/R10 and 0.7/R1, and the constant current source circuit has the functions of isolating the +5V power supply end from interference and limiting the 3.6V output current;
(5) Reference source circuit: the reference source chip LMV431AIM5, the resistor R14 and the resistor R15, the reference source chip LMV431AIM5, the resistor R17 and the resistor R18 respectively form two reference sources, the output voltage is calculated by Vout= (1+R14/R15) 1.24V and Vout= (1+R17/R18) 1.24V respectively, and the reference sources are used as low-power supplies to obtain high-precision power supplies.
The beneficial effects of the utility model are that:
(1) A multipath high-precision power supply circuit utilizes a single chip to output three different voltages, saves resources and improves the utilization efficiency of the chip compared with the single chip outputting single voltage.
(2) A multipath high-precision power supply circuit realizes two paths of high-stability analog power supplies by using a constant current source and a reference source.
Drawings
Fig. 1 is a schematic diagram of a multi-channel high-precision power supply circuit according to the present invention.
Detailed Description
The technical scheme of the invention is further described in detail below with reference to the attached drawings and specific embodiments.
A multipath high-precision power supply circuit consists of a booster circuit, a negative voltage circuit, a booster-step-down circuit, a constant current source circuit and a reference source circuit, and can generate +5V, -5V, +3V, high-precision +3.6V and high-precision-3.6V voltages.
(1) A booster circuit: the power supply circuit comprises an inductor L3, a diode D2, a capacitor C13, a resistor R9, a resistor R8 and a switching power supply chip LT1944-1LTTU, wherein the SW2 end of the switching power supply chip is connected with the anode of the diode D2 through the inductor L3, the cathode of the diode D2 is connected with the resistor R8 through the capacitor C13, one end of the resistor R9 is connected with the FB2 end of the switching power supply chip, one end of the resistor R9 is connected with the cathode of the diode D2, and +5V voltage is generated at the cathode end of the diode D2 and is calculated by Vout= (1+R9/R8) by 1.23V;
(2) Negative pressure circuit: the negative-pressure circuit is formed by a diode D3, a diode D4, a capacitor C2 and a capacitor E2, one end of an inductor L3 is connected with the positive electrode of a capacitor E1, the negative electrode of the capacitor E1 is connected with the negative electrode of the diode D3, the negative electrode of the capacitor E2 is connected with the positive electrode of the capacitor D4, the positive electrode of the capacitor E2 is connected with the negative electrode of the diode D3, the positive electrode of the diode D3 is connected with the negative electrode of the diode D4, one end of the capacitor C2 is connected with the inductor L3, one end of the capacitor C2 is connected with the positive electrode of the diode D3, the negative-pressure circuit generates negative voltage by inverting the output voltage of a booster circuit, the partial pressure of the diodes D4 and D2 is ignored, and the negative voltage with the magnitude of Vout= (1+R9/R8) is obtained at the positive electrode of D4, namely-5V;
(3) Step-up and step-down circuit: the power supply comprises an inductor L1, an inductor L2, a diode D1, a capacitor C10, a resistor R4, a resistor R6 and a switching power supply chip, wherein the output voltage can be higher or lower than the input voltage, the voltage value is calculated by Vout= (1+R4/R6). 1.23V, the positive electrode of a battery is connected with the SW1 end of the switching power supply chip through the inductor L2, meanwhile, the inductor L2 is connected with the FB1 end of the switching power supply through the capacitor C1, the diode D1 and the capacitor C10, the capacitor C1 is connected with the inductor L1 in series and grounded, the negative electrode of the diode D1 is connected with the capacitor C9 and then grounded, the capacitor C10 is connected with the FB1 end of the switching power supply in parallel with the resistor R4, and meanwhile, the capacitor C10 is connected with the resistor R6 and then grounded;
(4) Constant current source circuit: the three-level transistor Q3, the three-level transistor Q4, the resistor R10, the resistor R7, the capacitor C12, the three-level transistor Q1, the three-level transistor Q2, the resistor R1, the resistor R2 and the capacitor C3 respectively form two constant current sources, the base electrode of the three-level transistor Q3 is connected with the emitter electrode of the three-level transistor Q4, the emitter electrode of the three-level transistor Q3 is connected with the base electrode of the three-level transistor Q3 through the resistor R10, the collector electrode of the three-level transistor Q3 is connected with the base electrode of the three-level transistor Q4, one end of the capacitor C12 is connected with the collector electrode of the three-level transistor Q3 after being connected with the resistor R7 in parallel, and one end of the capacitor C12 is grounded; the base electrode of the transistor Q1 is connected with the emitter electrode of the transistor Q2, the resistor R1 is connected with the emitter electrodes of the transistor Q1 and the transistor Q2 respectively, the resistor R2 is connected with the capacitor C3 in parallel, the other end of the resistor is grounded, one end of the resistor is connected with the collector electrode of the transistor Q1, and the output current is determined by the emitter voltages of the base electrode of the transistor Q3, the emitter voltages of the base electrodes of the resistor R10 and the transistor Q1 and the emitter voltages of the resistor R1 respectively and is approximately equal to 0.7/R10 and 0.7/R1 respectively. The constant current source circuit has the functions of isolating the interference of a +5V power supply end and limiting the output current of 3.6V;
(5) Reference source circuit: the high-precision reference source chips LMV431AIM5, resistor R14, resistor R15, LMV431AIM5, resistor R17 and resistor R18 are adopted to respectively form two reference sources, and output voltages are respectively calculated by Vout= (1+R14/R15) 1.24V and Vout= (1+R17/R18) 1.24V. The reference source is used as a low-power supply, so that a high-precision power supply can be obtained.
The working principle of the invention is as follows:
a multipath and high-precision power supply circuit consists of a two-way switch power supply chip LT1944-1LTTU (U1 in figure 1) and peripheral circuits thereof, a constant current source circuit, a high-precision reference source chip LMV431AIM5 (U2 and U4 in figure 1) and peripheral circuits thereof. The 3.6V input voltage generates +3v voltage at the negative terminal of the diode D1 through the buck-boost circuit, the voltage is calculated by vout= (1+r4/r6) ×1.23v, and r6=680k and r4=1m are taken. The 3.6V input voltage generates +5v voltage at the negative terminal of the diode D2 through the boost circuit, and the voltage is calculated by vout= (1+r9/r8) ×1.23v, where r8=330k and r9=1m. The +5V voltage is negative voltage obtained at the positive electrode of the diode D4 through the negative voltage circuit, the partial pressure of the diodes D4 and D2 is ignored, and the obtained negative voltage value is-5V. The +5V voltage generates high-precision +3.6V voltage at the cathode end of the diode D6 through a constant current source circuit formed by Q3, Q4, R10, R7 and C12 and a reference original circuit formed by U4, R14 and R15, wherein the voltage is calculated by Vout= (1+R14/R15) ×1.24V, and R15=360K and R14=680K is taken. The high-precision-3.6V voltage is generated at the positive electrode end of the diode D7 by the 5V voltage through a constant current source circuit formed by Q1, Q2, R1, R2 and C3 and a reference original circuit formed by U2, R17 and R18, wherein the voltage is calculated by Vout= (1+R17/R18) 1.24V, and R18=360K and R17=680K is taken.
Claims (1)
1. A multipath high-precision power supply circuit is composed of a boost circuit, a negative voltage circuit, a boost-buck circuit, a constant current source circuit and a reference source circuit, and can generate +5V, -5V, +3V, high-precision +3.6V and high-precision-3.6V voltages, and is characterized in that:
(1) A booster circuit: the power supply circuit comprises an inductor L3, a diode D2, a capacitor C13, a resistor R9, a resistor R8 and a switching power supply chip LT1944-1LTTU, wherein the SW2 end of the switching power supply chip is connected with the anode of the diode D2 through the inductor L3, the cathode of the diode D2 is connected with the resistor R8 through the capacitor C13, one end of the resistor R9 is connected with the FB2 end of the switching power supply chip, one end of the resistor R9 is connected with the cathode of the diode D2, and +5V voltage is generated at the cathode end of the diode D2 and is calculated by Vout= (1+R9/R8) by 1.23V;
(2) Negative pressure circuit: the negative-pressure circuit is formed by a diode D3, a diode D4, a capacitor C2 and a capacitor E2, one end of the inductor L3 is connected with the positive electrode of the capacitor E1, the negative electrode of the capacitor E1 is connected with the negative electrode of the diode D3, the negative electrode of the capacitor E2 is connected with the positive electrode of the capacitor D4, the positive electrode of the capacitor E2 is connected with the negative electrode of the diode D3, the positive electrode of the diode D3 is connected with the negative electrode of the diode D4, one end of the capacitor C2 is connected with the inductor L3, one end of the capacitor C2 is connected with the positive electrode of the diode D3, the negative-pressure circuit generates voltage by inverting the output voltage of the boost circuit, the partial pressure of the diodes D4 and D2 is ignored, and negative voltage with the magnitude of Vout= (1+R9/R8) is 1.23V, namely-5V is obtained at the positive electrode;
(3) Step-up and step-down circuit: the power supply comprises an inductor L1, an inductor L2, a diode D1, a capacitor C10, a resistor R4, a resistor R6 and a switching power supply chip, wherein the output voltage can be higher or lower than the input voltage, the voltage value is calculated by Vout= (1+R4/R6). 1.23V, the positive electrode of a battery is connected with the SW1 end of the switching power supply chip through the inductor L2, meanwhile, the inductor L2 is connected with the FB1 end of the switching power supply through the capacitor C1, the diode D1 and the capacitor C10, the capacitor C1 is connected with the inductor L1 in series and grounded, the negative electrode of the diode D1 is connected with the capacitor C9 and then grounded, the capacitor C10 is connected with the FB1 end of the switching power supply in parallel with the resistor R4, and meanwhile, the capacitor C10 is connected with the resistor R6 and then grounded;
(4) Constant current source circuit: the three-level transistor Q3, the three-level transistor Q4, the resistor R10, the resistor R7, the capacitor C12, the three-level transistor Q1, the three-level transistor Q2, the resistor R1, the resistor R2 and the capacitor C3 respectively form two constant current sources, the base electrode of the three-level transistor Q3 is connected with the emitter electrode of the three-level transistor Q4, the emitter electrode of the three-level transistor Q3 is connected with the base electrode of the three-level transistor Q3 through the resistor R10, the collector electrode of the three-level transistor Q3 is connected with the base electrode of the three-level transistor Q4, one end of the capacitor C12 is connected with the collector electrode of the three-level transistor Q3 after being connected with the resistor R7 in parallel, and one end of the capacitor C12 is grounded; the base electrode of the transistor Q1 is connected with the emitter electrode of the transistor Q2, the resistor R1 is respectively connected with the emitter electrodes of the transistor Q1 and the transistor Q2, the resistor R2 is connected with the capacitor C3 in parallel, the other end of the resistor is grounded, one end of the resistor is connected with the collector electrode of the transistor Q1, the output current is respectively determined by the emitter voltages of the base electrode of the transistor Q3, the emitter voltages of the base electrodes of the resistor R10 and the transistor Q1 and R1 and is respectively equal to 0.7/R10 and 0.7/R1, and the constant current source circuit has the functions of isolating the interference of the +5V power supply end and limiting the output current of 3.6V;
(5) Reference source circuit: the reference source chip LMV431AIM5, the resistor R14 and the resistor R15 and the reference source chip LMV431AIM5, the resistor R17 and the resistor R18 respectively form two reference sources, output voltages are calculated by Vout= (1+R14/R15) 1.24V and Vout= (1+R17/R18) 1.24V respectively, and the reference sources are used as low-power supplies to obtain high-precision power supplies.
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| CN201610461237.9A CN106100322B (en) | 2016-06-23 | 2016-06-23 | Multipath high-precision power supply circuit |
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| CN201610461237.9A CN106100322B (en) | 2016-06-23 | 2016-06-23 | Multipath high-precision power supply circuit |
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| CN106100322B true CN106100322B (en) | 2023-10-20 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355133A (en) * | 2011-09-19 | 2012-02-15 | 东文高压电源（天津）有限公司 | High-voltage power supply circuit with wide-range input and multi-path isolated output |
| WO2016000259A1 (en) * | 2014-07-04 | 2016-01-07 | 深圳欧陆通电子有限公司 | Power supply |
| CN105305832A (en) * | 2015-10-13 | 2016-02-03 | 惠州三华工业有限公司 | Circuit for realizing multi-path positive and negative high-voltage output |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI326520B (en) * | 2006-09-29 | 2010-06-21 | Chimei Innolux Corp | Switching power supply circuit |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355133A (en) * | 2011-09-19 | 2012-02-15 | 东文高压电源（天津）有限公司 | High-voltage power supply circuit with wide-range input and multi-path isolated output |
| WO2016000259A1 (en) * | 2014-07-04 | 2016-01-07 | 深圳欧陆通电子有限公司 | Power supply |
| CN105305832A (en) * | 2015-10-13 | 2016-02-03 | 惠州三华工业有限公司 | Circuit for realizing multi-path positive and negative high-voltage output |
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