CN109343645B - Program-controlled power signal source output voltage multiplication circuit - Google Patents
Program-controlled power signal source output voltage multiplication circuit Download PDFInfo
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- CN109343645B CN109343645B CN201811264165.4A CN201811264165A CN109343645B CN 109343645 B CN109343645 B CN 109343645B CN 201811264165 A CN201811264165 A CN 201811264165A CN 109343645 B CN109343645 B CN 109343645B
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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
- G05F1/625—Regulating voltage or current wherein it is irrelevant whether the variable actually regulated is ac or dc
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Abstract
The invention discloses a program-controlled power signal source output voltage multiplying circuit, which comprises a differential amplification circuit, an operational amplifier power supply, a second power amplifier, a third power amplifier, an inverter and a power supply, wherein the input of the differential amplification circuit is connected with Va and a power amplification system reference ground GND, the output of the differential amplification circuit is connected with the second power amplifier and the inverter, the output of the second power amplifier is Ua, the output of the inverter is connected with the third power amplifier, the output of the third power amplifier is Ua, the power supply is respectively connected with the second power amplifier and the third power amplifier, the operational amplifier power supply is respectively connected with the differential amplification circuit and the inverter, and the Ua is connected with the GND. The invention doubles the voltage output amplitude of the existing program control power signal source, and has the advantages of high response speed and good waveform playback effect.
Description
Technical Field
The invention relates to the field of power distribution automation terminal testing, in particular to an output voltage multiplication circuit of a program control power signal source.
Background
In the production debugging and field testing links of the distribution automation terminal, a program-controlled power signal source is required to generate controllable voltage and current signals which are input into the distribution automation terminal to judge whether the functions and the performance of the distribution automation terminal are normal.
The output voltage of the existing program-controlled power signal source can only reach 120V of alternating current, and the test requirements cannot be met for some distribution automatic terminals working in an alternating current 220V system, particularly for distribution automatic terminals working in an alternating current 220V system and integrating supply and sampling.
Analyzing the voltage output structure of the existing program-controlled power signal, as shown in fig. 1, the input small signal Va is amplified by the voltage power amplifier to output Ua. The input and output are common GND, the voltage of VP to GND and the voltage of GND to VN are about 200V of direct current, and the voltage of PMOS and NMOS of the output stage of the voltage power amplifier is 500V.
To double the output voltage to 240V ac, that is, to meet the test requirement of the distribution automation terminal of the 220V system, the following changes are required:
1. the output stage of the voltage power amplifier output device is changed to be PMOS and NMOS with 1000V withstand voltage, and the voltage of VP to GND and the voltage of GND to VN are increased to be 400V of direct current;
2. the amplification factor of the voltage power amplifier is doubled.
In the first variation, 1000V PMOS can not be found by the manufacturers at present, and this scheme is not feasible.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an output voltage multiplication circuit of a program control power signal source.
The technical scheme adopted by the invention is as follows:
the utility model provides a programme-controlled power signal source output voltage multiplier circuit, includes differential amplifier circuit, operational amplifier power supply, second power amplifier, third power amplifier, inverter and power supply, the differential amplifier circuit input connects Va and power amplifier system ground of reference GND, and the output connects second power amplifier with the inverter, second power amplifier output Ua, the inverter output connects third power amplifier, third power amplifier output-Ua, power supply connects respectively second power amplifier with third power amplifier, operational amplifier power supply connects respectively differential amplifier circuit with the inverter, Ua is connected to GND.
The differential amplification circuit comprises a No. 3 operational amplifier and a plurality of resistors, wherein: the non-inverting input end of the 3 rd operational amplifier is respectively connected with one end of a 3 rd 'resistor, a 4 th' resistor and a 5 th 'resistor, the other end of the 3 rd' resistor, the other end of the 4 th 'resistor and the other end of the 5 th' resistor are connected with GND, and the GND is connected with a floating reference ground VG; the inverting input end of the 3 rd operational amplifier is respectively connected with one end of a 3 rd resistor, one end of a 4 th resistor and one end of a 5 th resistor, the other ends of the 3 rd resistor, the 4 th resistor and the 5 th resistor are respectively connected with Va, VG and the output end of the 3 rd operational amplifier, and the output end of the 3 rd operational amplifier is respectively connected with the second power amplifier and the inverter.
The 3 rd resistor, the 3 rd ' resistor, the 5 th resistor and the 5 th ' resistor are equal in resistance value, and the 4 th resistor and the 4 th ' resistor are equal in resistance value.
The inverter comprises a 1 st operational amplifier and a plurality of resistors, wherein: the non-inverting input end of the 1 st operational amplifier is respectively connected with one end of a 1 st 'resistor and one end of a 2 nd' resistor, and the other end of the 1 st 'resistor and the other end of the 2 nd' resistor are connected with VG; the inverting input end of the 1 st operational amplifier is respectively connected with one end of a 1 st resistor and one end of a 2 nd resistor, the other end of the 1 st resistor is connected with the output end of the differential amplification circuit, the other end of the 2 nd resistor is connected with the output end of the differential amplification circuit, and the output end of the differential amplification circuit is connected with the third power amplifier.
The 1 st resistor, the 1' st resistor, the 2 nd resistor and the 2 nd resistor are equal in resistance value.
Compared with the prior art, the invention has the beneficial effects that:
the output amplitude and the output power of the existing program control function signal source are doubled, the test requirement of the distribution automation terminal of an alternating current 220V system can be met, the response speed is high, and the waveform playback effect is good.
Drawings
FIG. 1 is a circuit diagram of a voltage output structure of a conventional programmable power signal source;
FIG. 2 is a block diagram of an output voltage multiplier circuit according to an embodiment of the present invention;
FIG. 3 is a block diagram of a differential amplifier circuit according to an embodiment of the present invention;
fig. 4 is a circuit diagram of an inverter according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 2, an output voltage multiplier circuit of a program-controlled power signal source includes a differential amplifier circuit 1, an operational amplifier power supply 5, a second power amplifier 2, a third power amplifier 3, an inverter 4 and a power supply 6, wherein an input of the differential amplifier circuit 1 is connected to Va and a power amplifier system reference ground GND, an output of the differential amplifier circuit 1 is connected to the second power amplifier 2 and the inverter 4, an output of the second power amplifier 2Ua, an output of the inverter 4 is connected to the third power amplifier 3, an output of the third power amplifier 3-Ua, the power supply 6 is respectively connected to the second power amplifier 2 and the third power amplifier 3, the operational amplifier power supply 6 is respectively connected to the differential amplifier circuit 1 and the inverter 4, and-Ua is connected to GND. since-Ua is connected to GND, the output voltage is equal to 2Ua, i.e. output voltage multiplication is achieved.
As shown in fig. 3, the differential amplifier circuit 1 includes a 3 rd operational amplifier U3B and several resistors, wherein: the non-inverting input end of the 3 rd operational amplifier U3B is respectively connected with one end of the 3 rd 'resistor R3', the 4 th 'resistor R4' and the 5 th 'resistor R5', the other end of the 3 rd 'resistor R3', the 4 th 'resistor R4' and the 5 th 'resistor R5' is connected with GND, and the GND is connected with the floating reference ground VG; the inverting input end of the 3 rd operational amplifier U3B is respectively connected with one end of a 3 rd resistor R3, a 4 th resistor R4 and a 5 th resistor R5, the other ends of the 3 rd resistor R3, the 4 th resistor R4 and the 5 th resistor R5 are respectively connected with Va, VG and the output end of the 3 rd operational amplifier U3B, and the output end of the 3 rd operational amplifier U3B is respectively connected with the second power amplifier 2 and the inverter 4.
Since the reference ground is VG and Ua is connected to GND, it can be seen that the input common-mode voltage Vcm of the differential amplifier circuit 1 has a magnitude equal to Ua, and Vcm affects the accuracy of Va' according to CMRR (common mode rejection ratio) of the circuit. Therefore, in order to achieve the target accuracy, the CMRR of the differential amplifier circuit 1 is considered in the implementation of the present invention.
The relative error of Va' can be expressed as: ua CMRR/Va-o-r
Substituting Ua-Va '-G into formula I to obtain-Va' -G-CMRR/Va-C
Va' is approximately equal to Va and is substituted into the formula II to obtain CMRR-/G- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
For example, the requirement is < + > -0.4%, the amplification factor G of the power amplifier is equal to 40 times, and the CMRR of the differential amplifier circuit 1 is calculated according to formula (c) and should be greater than 10000 times (i.e. 80 dB). To improve the CMRR of the differential amplifier circuit 1, the precision of the resistors in the circuit is mainly improved, and an adjustable resistor with a small resistance value can be connected in series for fine adjustment if necessary.
Meanwhile, an appropriate resistance value is selected according to the actual Vcm, so that the No. 3 operational amplifier U3B works normally. In fig. 3, the 3 rd resistor R3, the 3 rd 'resistor R3', the 5 th resistor R5 and the 5 th 'resistor R5' are equal, the 4 th resistor R4 and the 4 th 'resistor R4' are equal, and the reference ground is VG.
Input voltage of the operational amplifier U3B:
Vi＝Vcm*(R4//R5)/(R3+(R4//R5))-------------④
for example, if the amplitude Vcm is 210V, the 3 rd resistor R3 is 380k Ω, the 5 th resistor R5 is 380k Ω, and the 4 th resistor R4 is 20k Ω, Vi is 10V, which is smaller than the maximum input voltage of the general 15V powered operational amplifier, and the amplifier can operate normally.
As shown in fig. 4, the inverter includes a 1 st operational amplifier and a plurality of resistors, wherein: the non-inverting input end of the 1 st operational amplifier U1B is respectively connected with one ends of a 1 st resistor R1 'and a 2 nd resistor R2', and the other ends of the 1 st resistor R1 'and the 2 nd resistor R2' are connected with VG; the inverting input end of the 1 st operational amplifier U1B is connected to one end of the 1 st resistor R1 and one end of the 2 nd resistor R2 respectively, the other end of the 1 st resistor R1 is connected to the output end of the differential amplification circuit 1, the other end of the 2 nd resistor R2 is connected to the output end of the 1 st operational amplifier, and the output end of the 1 st operational amplifier is connected to the third power amplifier 3. The 1 st resistor R1, the 2 nd resistor R2, the 1 st 'resistor R1' and the 2 nd 'resistor R2' are equal, and the reference ground is VG.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. A program-controlled power signal source output voltage multiplication circuit is characterized by comprising a differential amplification circuit, an operational amplifier power supply, a second power amplifier, a third power amplifier, an inverter and a power supply, wherein the input of the differential amplification circuit is connected with Va and a power amplification system reference ground GND, the output of the differential amplification circuit is connected with the second power amplifier and the inverter, the output of the second power amplifier is Ua, the output of the inverter is connected with the third power amplifier, the output of the third power amplifier is-Ua, the power supply is respectively connected with the second power amplifier and the third power amplifier, the operational amplifier power supply is respectively connected with the differential amplification circuit and the inverter, and the-Ua is connected with GND;
the differential amplification circuit comprises a No. 3 operational amplifier and a plurality of resistors, wherein: the non-inverting input end of the 3 rd operational amplifier is respectively connected with one end of a 3 rd 'resistor, a 4 th' resistor and a 5 th 'resistor, the other end of the 3 rd' resistor, the other end of the 4 th 'resistor and the other end of the 5 th' resistor are connected with GND, and the GND is connected with a floating reference ground VG; the inverting input end of the 3 rd operational amplifier is respectively connected with one end of a 3 rd resistor, one end of a 4 th resistor and one end of a 5 th resistor, the other ends of the 3 rd resistor, the 4 th resistor and the 5 th resistor are respectively connected with Va, VG and the output end of the 3 rd operational amplifier, and the output end of the 3 rd operational amplifier is respectively connected with the second power amplifier and the inverter;
the 3 rd resistor, the 3 rd ' resistor, the 5 th resistor and the 5 th ' resistor are equal in resistance value, and the 4 th resistor and the 4 th ' resistor are equal in resistance value.
2. The programmable power signal source output voltage multiplying circuit of claim 1, wherein the inverter comprises a 1 st operational amplifier and a plurality of resistors, wherein: the non-inverting input end of the 1 st operational amplifier is respectively connected with one end of a 1 st 'resistor and one end of a 2 nd' resistor, and the other end of the 1 st 'resistor and the other end of the 2 nd' resistor are connected with VG; the inverting input end of the 1 st operational amplifier is respectively connected with one end of a 1 st resistor and one end of a 2 nd resistor, the other end of the 1 st resistor is connected with the output end of the differential amplification circuit, the other end of the 2 nd resistor is connected with the output end of the 1 st operational amplifier, and the output end of the 1 st operational amplifier is connected with the third power amplifier.
3. The output voltage multiplying circuit of claim 2, wherein the resistances of the 1 st resistor, the 1 st 'resistor, the 2 nd resistor and the 2 nd' resistor are equal.
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| CN201811264165.4A CN109343645B (en) | 2018-10-26 | 2018-10-26 | Program-controlled power signal source output voltage multiplication circuit |
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| CN201811264165.4A CN109343645B (en) | 2018-10-26 | 2018-10-26 | Program-controlled power signal source output voltage multiplication circuit |
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| CN109343645B true CN109343645B (en) | 2020-09-15 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590776A (en) * | 2012-02-02 | 2012-07-18 | 高鹤 | Handheld intelligent signal generator |
| CN104868878A (en) * | 2015-05-21 | 2015-08-26 | 来安县新元机电设备设计有限公司 | Signal generation circuit and signal generator |
| CN205210230U (en) * | 2015-11-27 | 2016-05-04 | 云南电网有限责任公司电力科学研究院 | A high voltage output device for feeder automation test |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8564352B2 (en) * | 2012-02-10 | 2013-10-22 | International Business Machines Corporation | High-resolution phase interpolators |
| US10200075B2 (en) * | 2016-03-04 | 2019-02-05 | Raytheon Company | Discrete time analog signal processing for simultaneous transmit and receive |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590776A (en) * | 2012-02-02 | 2012-07-18 | 高鹤 | Handheld intelligent signal generator |
| CN104868878A (en) * | 2015-05-21 | 2015-08-26 | 来安县新元机电设备设计有限公司 | Signal generation circuit and signal generator |
| CN205210230U (en) * | 2015-11-27 | 2016-05-04 | 云南电网有限责任公司电力科学研究院 | A high voltage output device for feeder automation test |
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