CN103795400B - High-precision sampling circuit based on VICOR module - Google Patents
High-precision sampling circuit based on VICOR module Download PDFInfo
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- CN103795400B CN103795400B CN201210430977.8A CN201210430977A CN103795400B CN 103795400 B CN103795400 B CN 103795400B CN 201210430977 A CN201210430977 A CN 201210430977A CN 103795400 B CN103795400 B CN 103795400B
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Abstract
The invention belongs to the technical field of a sampling circuit, and specifically relates to a high-precision sampling circuit based on a VICOR module. The high-precision sampling circuit comprises the VICOR module, a sampling signal processing circuit, a remote sampling/local sampling switching circuit and an empty sampling prevention circuit. The sampling signal processing circuit and the remote sampling/local sampling switching circuit are respectively connected in parallel between the sampling positive line +S pin and the sampling negative line -S pin of the VICOR module, and the empty sampling prevention circuit is connected in parallel between the voltage adjusting end SC pin and the sampling negative line -S pin of the VICOR module. The high-precision sampling circuit provided by the invention solves the technical problems of limited sampling point positions and poor output load stability of a conventional sampling circuit based on a VICOR module and has the advantages of randomly placed sampling points, good stability and high reliability.
Description
Technical Field
The invention belongs to the technical field of sampling circuits, and particularly relates to a high-precision sampling circuit based on a VICOR module.
Background
The direct current power supply of the Maxi DC-DC module and the Mini DC-DC module based on the VICOR module is widely applied to power supply systems of various ground and vehicle-mounted equipment. The sampling circuit of the VICOR module is arranged between the control circuit and the power circuit in the direct current power supply and is used for providing feedback of the output of the power circuit for the control circuit. The performance of the sampling circuit is an important factor influencing the stability of the load of the direct-current power supply. When the existing sampling circuit based on the VICOR module works, according to the VICOR application manual, connection is recommended, a sampling line is directly led out from a sampling end of the module to be connected to a sampling point close to a load, and the voltage of the load end is collected to be fed back to the VICOR module. The connection mode has higher requirements on the sampling point position, especially in the application of large current, the sampling point position cannot be far away from the output end of the VICOR module, otherwise, when the large current is output, the voltage between the sampling end and the output end of the VICOR module, namely the output compensation voltage, can exceed the voltage limit value between the pins of the VICOR module, so that the internal damage of the VICOR module is caused, and the reliability of a power supply is reduced. Once the sampling point position is limited, the sampling effect is also influenced, and the stability of the output load of the direct current power supply based on the VICOR module is reduced. Meanwhile, if the remote sampling and the local sampling are simultaneously performed in the conventional direct-current power supply based on the VICOR module, a short-time emptying situation can occur when the remote sampling and the local sampling are switched or the sampling line is disconnected by mistake, so that the output voltage is suddenly increased, even the overvoltage is caused, and the normal use of the power supply is influenced.
Disclosure of Invention
The technical problems to be solved by the invention are as follows:
in the sampling circuit based on the VICOR module in the prior art, the sampling point must be arranged near the output end of the VICOR module, the position is limited, and the stability of the output load of the direct-current power supply based on the VICOR module is reduced.
The technical scheme of the invention is as follows:
a high-precision sampling circuit based on a VICOR module comprises the VICOR module, a sampling signal processing circuit, a remote sampling/local sampling switching circuit and an anti-empty sampling circuit; the sampling signal processing circuit and the remote sampling/local sampling switching circuit are respectively connected in parallel between a sampling positive line + S pin and a sampling negative line-S pin of the VICOR module; the anti-empty-sampling circuit is connected in parallel between the SC pin of the voltage regulating end of the VICOR module and the-S pin of the sampling negative line.
And an OUT + pin of the VICOR module is in short circuit with a sampling positive line + S pin, and an OUT-pin is in short circuit with a sampling negative line-S pin.
The sampling signal processing circuit comprises an output adjusting circuit and a sampling comparison circuit which are connected in series:
the output adjusting circuit comprises a resistor R1, a resistor R3, a resistor R4 and an optical coupler V1: one end of the resistor R1 is connected with a sampling positive line + S pin of the VICOR module, and the other end of the resistor R1 is connected with a resistor R3; the other pin of the resistor R3 is connected with the collector of a phototriode in the optocoupler V1; an emitter of a phototriode in the optocoupler V1 is connected with a sampling negative line-S pin of the VICOR module; an anode of a light emitting diode in the optocoupler V1 is connected with the resistor R4, and meanwhile, the anode is also directly output to the sampling comparison circuit; the other end of the resistor R4 is output to a sampling comparison circuit; the cathode of a light emitting diode in the optocoupler V1 is output to a sampling comparison circuit;
the sampling comparison circuit comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8, an operational amplifier N1, a reference N2, a capacitor C3, a capacitor C4, a capacitor C5 and a chip power supply VCC 1: VCC1 supplies power to the operational amplifier N1; the resistor R5 is connected in parallel between the cathode and the anode of a light emitting diode in the optocoupler V1 of the output adjusting circuit, and one end of the resistor R5 connected with the cathode is also connected with the output end of the operational amplifier N1; the capacitor C3 is connected in parallel with the input negative end and the output end of the operational amplifier N1; the resistor R6 is connected in parallel with the input positive terminal of the operational amplifier N1 and the power supply positive terminal VCC 1; the anode of the reference N2 is in short circuit with the negative input terminal of the operational amplifier N1, and the cathode of the reference N2 and the reference electrode are in short circuit with the positive input terminal of the operational amplifier N1; the capacitor C4 is connected in parallel between the reference pole and the anode of the reference N2; the capacitor C5 is connected in parallel at two ends of the chip power supply VCC 1; the resistor R7 and the resistor R8 are connected in series, the connection point of the resistor R7 and the resistor R8 is connected with the input negative end of the operational amplifier N1, and the other ends of the resistor R7 and the resistor R8 are respectively connected to a remote sampling/local sampling switching circuit; the connection point of the resistor R4 and the anode of the light emitting diode in the optocoupler V1 is also connected with R5, and the other end of the R4 is connected with a chip power supply VCC 1.
The remote sampling/local sampling switching circuit comprises two groups of switching switches: the group of change-over switches K1B and K1C are connected in parallel to an OUT + pin and an OUT-pin of the VICOR module; another group of switches K2B and K2C are connected in parallel to the free ends of the resistors R7 and R8; when the switches K1B and K1C are communicated with the load at the local end, the switches K2B and K2C are also communicated with the load at the local end; when the switches K1B and K1C are connected to the remote loads, the switches K2B and K2C are also connected to the remote loads.
The anti-sampling circuit comprises a resistor R2 which is connected in parallel between the SC pin of the voltage regulating end and the negative sampling line-S pin.
Wherein,
R2represents the resistance of the resistor R2;
R1represents the resistance of the resistor R1;
Vnomrepresenting the rated output voltage of the VICOR module;
Voutrepresenting the actual output voltage of the VICOR module;
Vout_maxindicating that the set module outputs the highest voltage.
The invention has the following beneficial effects:
(1) according to the high-precision sampling circuit based on the VICOR module, under the condition that the VICOR module is not damaged, the position of a sampling point can be placed at will, and VICOR output voltage feedback closer to a load end is provided, so that the stability of a power output load is improved;
(2) the high-precision sampling circuit based on the VICOR module has a mining-empty prevention function, can effectively inhibit output voltage overshoot under the condition that a sampling line is disconnected, and improves the reliability of a power supply.
Drawings
FIG. 1 is a circuit diagram of a high-precision sampling circuit based on a VICOR module according to the present invention.
In the figure, a 1-VICOR module, a 2-anti-empty-sampling circuit, a 3-sampling signal processing circuit, a 4-remote sampling/local sampling switching circuit, a 5-remote load, a 6-local load, a 7-sampling switching circuit, an 8-power switching circuit, a 9-sampling comparison circuit and a 10-output adjusting circuit.
Detailed Description
The VICOR module-based high-precision sampling circuit of the present invention is described in detail below with reference to the accompanying drawings and embodiments.
The high-precision sampling circuit based on the VICOR module comprises the VICOR module 1, a sampling signal processing circuit 3, a remote sampling/local sampling switching circuit 4 and an anti-empty sampling circuit 2. The sampling signal processing circuit 3 and the remote sampling/local sampling switching circuit 4 are respectively connected in parallel between a sampling positive line + S pin and a sampling negative line-S pin of the VICOR module 1; the anti-empty-sampling circuit 2 is connected in parallel between the SC pin of the voltage regulating end of the VICOR module 1 and the-S pin of the sampling negative line.
In particular, the VICOR module 1 refers to a Maxi DC-DC module and a Mini DC-DC module, which are common knowledge to those skilled in the art.
The OUT + pin of the VICOR module 1 is in short circuit with the sampling positive line + S pin, and the OUT-pin is in short circuit with the sampling negative line-S pin, so that the voltage between the OUT + pin and the sampling positive line + S pin, and the voltage between the OUT-pin and the sampling negative line-S pin are limited to be 0V, and overvoltage among the pins is avoided.
The sampling signal processing circuit 3 includes an output adjusting circuit 10 and a sampling comparing circuit 9 connected in series.
The output adjusting circuit 10 includes a resistor R1, a resistor R3, a resistor R4, and an optocoupler V1: one end of the resistor R1 is connected with a sampling positive line + S pin of the VICOR module 1, and the other end of the resistor R1 is connected with a resistor R3; the other pin of the resistor R3 is connected with the collector of a phototriode in the optocoupler V1; an emitter of a phototriode in the optocoupler V1 is connected with a sampling negative line-S pin of the VICOR module 1; an anode of a light emitting diode in the optocoupler V1 is connected with the resistor R4, and meanwhile, the anode is also directly output to the sampling comparison circuit 9; the other end of the resistor R4 is output to the sampling comparison circuit 9; the cathode of the light emitting diode in the optocoupler V1 is output to the sampling comparison circuit 9.
The sampling comparison circuit 9 comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8, an operational amplifier N1, a reference N2, a capacitor C3, a capacitor C4, a capacitor C5 and a chip power supply VCC 1: VCC1 supplies power to the operational amplifier N1; the resistor R5 is connected in parallel between the cathode and the anode of the light emitting diode in the optocoupler V1 of the output adjusting circuit 10, and one end of the resistor R5 connected with the cathode is also connected with the output end of the operational amplifier N1; the capacitor C3 is connected in parallel with the input negative end and the output end of the operational amplifier N1; the resistor R6 is connected in parallel with the input positive terminal of the operational amplifier N1 and the power supply positive terminal VCC 1; the anode of the reference N2 is in short circuit with the negative input terminal of the operational amplifier N1, and the cathode of the reference N2 and the reference electrode are in short circuit with the positive input terminal of the operational amplifier N1; the capacitor C4 is connected in parallel between the reference pole and the anode of the reference N2; the capacitor C5 is connected in parallel at two ends of the chip power supply VCC 1; the resistor R7 and the resistor R8 are connected in series, the connection point of the resistor R7 and the resistor R8 is connected with the input negative end of the operational amplifier N1, and the other ends of the resistor R7 and the resistor R8 are respectively connected to the remote sampling/local sampling switching circuit 4; the connection point of the resistor R4 and the anode of the light emitting diode in the optocoupler V1 is also connected with R5, and the other end of the R4 is connected with a chip power supply VCC 1.
When the output power line of the load is within 50 meters, the load is regarded as a local load 6, and when the output power line is more than 50 meters, the load is regarded as a remote load 5. The remote sampling/present sampling switching circuit 4 includes two sets of switching switches: the group of change-over switches K1B and K1C are connected in parallel to the OUT + pin and the OUT-pin of the VICOR module 1; another group of switches K2B and K2C are connected in parallel to the free ends of the resistors R7 and R8; when the switches K1B and K1C are communicated with the local load 6, the switches K2B and K2C are also communicated with the local load 6; when the switches K1B and K1C are connected to the remote load 5, the switches K2B and K2C are also connected to the remote load 5.
The anti-sampling circuit 2 comprises a resistor R2 which is connected in parallel between the voltage regulating end SC pin and the sampling negative line-S pin.
Wherein,
R2represents the resistance of the resistor R2;
R1represents the resistance of the resistor R1;
Vnomrepresents the nominal output voltage of the VICOR module 1;
Voutrepresents the actual output voltage of the VICOR module 1;
Vout_maxindicating that the set module outputs the highest voltage.
Claims (4)
1. The utility model provides a high accuracy sampling circuit based on VICOR module, includes VICOR module (1) and sampling signal processing circuit (3), its characterized in that: the remote/local sampling switching circuit (4) and the anti-empty-sampling circuit (2) are also included; the sampling signal processing circuit (3) and the remote sampling/local sampling switching circuit (4) are respectively connected in parallel between a sampling positive line + S pin and a sampling negative line-S pin of the VICOR module (1); the anti-empty-mining circuit (2) is connected in parallel between the SC pin of the voltage regulating end and the S pin of the sampling negative line of the VICOR module (1);
an OUT + pin of the VICOR module (1) is in short circuit with a sampling positive line + S pin, and an OUT-pin is in short circuit with a sampling negative line-S pin;
the sampling signal processing circuit (3) comprises an output adjusting circuit (10) and a sampling comparison circuit (9) which are connected in series:
the output adjusting circuit (10) comprises a resistor R1, a resistor R3, a resistor R4 and an optical coupler (V1): one end of the resistor R1 is connected with a sampling positive line + S pin of the VICOR module (1), and the other end of the resistor R1 is connected with a resistor R3; the other pin of the resistor R3 is connected with the collector of a phototriode in the optocoupler (V1); an emitter of a phototriode in the optocoupler (V1) is connected with a sampling negative line-S pin of the VICOR module (1); the anode of a light emitting diode in the optocoupler (V1) is connected with the resistor R4, and meanwhile, the anode is also directly output to the sampling comparison circuit (9); the other end of the resistor R4 is output to a sampling comparison circuit (9); the cathode of a light emitting diode in the optical coupler (V1) is output to a sampling comparison circuit (9);
the sampling comparison circuit (9) comprises a resistor R5, a resistor R6, a resistor R7, a resistor R8, an operational amplifier (N1), a reference (N2), a capacitor C3, a capacitor C4, a capacitor C5 and a chip power supply VCC 1: VCC1 supplies power to the operational amplifier (N1); the resistor R5 is connected in parallel between the cathode and the anode of a light emitting diode in an optocoupler (V1) of the output adjusting circuit (10), and one end of the resistor R5 connected with the cathode is also connected with the output end of the operational amplifier (N1); the capacitor C3 is connected in parallel with the input negative end and the output end of the operational amplifier (N1); the resistor R6 is connected in parallel with the input positive terminal of the operational amplifier (N1) and the power supply positive terminal VCC 1; the anode of the reference (N2) is in short circuit with the negative input terminal of the operational amplifier (N1), and the cathode of the reference (N2) and the reference electrode are in short circuit with the positive input terminal of the operational amplifier (N1); the capacitor C4 is connected in parallel between the reference pole of the benchmark (N2) and the anode; the capacitor C5 is connected in parallel at two ends of the chip power supply VCC 1; the resistor R7 and the resistor R8 are connected in series, the connection point of the resistor R7 and the resistor R8 is connected with the input negative end of the operational amplifier (N1), and the other ends of the resistor R7 and the resistor R8 are respectively connected to the remote sampling/current sampling switching circuit (4); the connection point of the resistor R4 and the anode of the light emitting diode in the optocoupler (V1) is also connected with R5, and the other end of the R4 is connected with a chip power supply VCC 1.
2. The VICOR module-based high-precision sampling circuit of claim 1, wherein: the remote sampling/local sampling switching circuit (4) comprises two groups of switching switches: the group of change-over switches (K1B, K1C) are connected to the OUT + pin and the OUT-pin of the VICOR module (1) in parallel; another group of switches (K2B, K2C) are connected in parallel to the free ends of the resistors R7 and R8; when one group of the change-over switches (K1B, K1C) is communicated with the local load (6), the other group of the change-over switches (K2B, K2C) is also communicated with the local load (6); when one group of the change-over switches (K1B, K1C) is communicated with the remote load (5), the other group of the change-over switches (K2B, K2C) is also communicated with the remote load (5).
3. The VICOR module-based high-precision sampling circuit of claim 2, wherein: the anti-mining-empty circuit (2) comprises a resistor R2 which is connected in parallel between a voltage regulating end SC pin and a sampling negative line-S pin.
4. A VICOR module based high accuracy sampling circuit as defined in claim 3, wherein:
wherein,
R2represents the resistance of the resistor R2;
R1represents the resistance of the resistor R1;
Vnomrepresents the rated output voltage of the VICOR module (1);
Voutrepresenting the actual output voltage of the VICOR module (1);
Vout_maxindicating that the set module outputs the highest voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210430977.8A CN103795400B (en) | 2012-11-01 | 2012-11-01 | High-precision sampling circuit based on VICOR module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210430977.8A CN103795400B (en) | 2012-11-01 | 2012-11-01 | High-precision sampling circuit based on VICOR module |
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| Publication Number | Publication Date |
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| CN103795400A CN103795400A (en) | 2014-05-14 |
| CN103795400B true CN103795400B (en) | 2017-02-01 |
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| CN201210430977.8A Active CN103795400B (en) | 2012-11-01 | 2012-11-01 | High-precision sampling circuit based on VICOR module |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113703387A (en) * | 2021-08-24 | 2021-11-26 | 无锡江南计算技术研究所 | Dual output voltage sampling circuit switching system of treater power |
| CN114374308B (en) * | 2021-12-15 | 2024-06-04 | 北京电子工程总体研究所 | Switch power supply isolation remote sampling circuit and design method thereof |
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| US6940261B1 (en) * | 2003-03-19 | 2005-09-06 | Linear Technology Corporation | Circuits and methods for providing multiple phase switching regulators which employ the input capacitor voltage signal for current sensing |
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| CN201749138U (en) * | 2010-08-29 | 2011-02-16 | 飞跃联合科技集团有限公司 | Sampling circuit of single-phase and fee-controlled intelligent electric energy meter |
| CN102707759A (en) * | 2012-06-29 | 2012-10-03 | 北京机械设备研究所 | Remote-end remote control voltage-regulating and load-end sampling circuit for resistance-capacitance isolated power supply |
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2012
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|---|---|---|---|---|
| US6940261B1 (en) * | 2003-03-19 | 2005-09-06 | Linear Technology Corporation | Circuits and methods for providing multiple phase switching regulators which employ the input capacitor voltage signal for current sensing |
| CN101436756A (en) * | 2008-11-20 | 2009-05-20 | 武汉凌云光电科技有限责任公司 | Drive device for power supply of high power semiconductor laser device |
| CN201749138U (en) * | 2010-08-29 | 2011-02-16 | 飞跃联合科技集团有限公司 | Sampling circuit of single-phase and fee-controlled intelligent electric energy meter |
| CN102707759A (en) * | 2012-06-29 | 2012-10-03 | 北京机械设备研究所 | Remote-end remote control voltage-regulating and load-end sampling circuit for resistance-capacitance isolated power supply |
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