CN106680737B - Positive and negative power supply voltage balance performance indicating device for experimental equipment - Google Patents
Positive and negative power supply voltage balance performance indicating device for experimental equipment Download PDFInfo
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- CN106680737B CN106680737B CN201710119248.3A CN201710119248A CN106680737B CN 106680737 B CN106680737 B CN 106680737B CN 201710119248 A CN201710119248 A CN 201710119248A CN 106680737 B CN106680737 B CN 106680737B
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- 238000012937 correction Methods 0.000 claims abstract description 22
- 230000009466 transformation Effects 0.000 claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
Abstract
The positive and negative power supply voltage balance performance indicating device for the experimental equipment comprises a positive and negative power supply interface (1), a voltage operation unit (2), a polarity automatic correction unit (3), an impedance transformation unit (4), a voltage reference unit (5), a voltage comparison unit (6) and an indicating unit (7). The voltage signals of the positive and negative power supplies are provided through the positive and negative power supply interfaces, the difference value of the positive and negative power supplies is calculated through the voltage calculation unit, positive unbalanced voltage is output through the polarity automatic correction unit, the high-impedance voltage signals are converted into low-impedance voltage signals through the impedance conversion unit and are output, the low-impedance voltage signals are sent to the voltage comparison unit, and after the low-impedance voltage signals are compared with the reference voltage signals, signals for driving the light emitting diodes to emit light are output, so that whether the voltage of the positive and negative power supplies is in an unbalanced state or not is indicated.
Description
Technical Field
The invention relates to performance monitoring of a direct-current power supply, in particular to a positive and negative power supply voltage balance performance indicating device for experimental equipment, and belongs to the technical field of power supply detection.
Background
At present, some experimental devices for sensor experiments mostly adopt positive and negative power supplies to supply power to an operational amplifier in the device, and in the experimental process, students are often found to be correctly wired and cannot obtain correct experimental results, wherein a part of reasons are that the positive and negative power supplies have problems.
In order to reduce the influence of unbalance of the positive and negative power supply voltages on experiments, the balance performance of the positive and negative power supply voltages needs to be monitored in real time so as to observe the balance state of the power supply in time and conveniently.
Disclosure of Invention
The invention aims to provide the positive and negative power supply voltage balance performance indicating device for the experimental equipment, so that the influence of unbalance of the positive and negative power supply voltages on the experiment is reduced, and an indicating signal is given in real time by monitoring the balance performance of the positive and negative power supply voltages in real time, so that the balance state of the power supply is observed in time, and the power supply fault is removed conveniently.
The purpose of the invention is realized in the following way: positive and negative power supply voltage balance performance indicating device for experimental facilities includes: the device comprises a positive and negative power interface (1), a voltage operation unit (2), a polarity automatic correction unit (3), an impedance transformation unit (4), a voltage reference unit (5), a voltage comparison unit (6) and an indication unit (7); wherein:
positive and negative power interfaces (1): the device is connected with a positive power supply and a negative power supply, supplies power to each unit of the device and is electrically connected with related units;
voltage operation unit (2): carrying out heteropolarity addition operation on the voltages of the positive and negative power supplies, and forming electric connection with the positive and negative power supply interface (1) and the polarity automatic correction unit (3);
polarity automatic correction unit (3): the unbalanced negative voltage output by the voltage operation unit (2) is automatically corrected to positive voltage, and the positive voltage and the negative voltage are electrically connected with the positive power interface (1), the voltage operation unit (2) and the impedance transformation unit (4);
impedance conversion unit (4): the high-impedance signal output by the polarity automatic correction unit (3) is converted into a low-impedance signal to be output, and the low-impedance signal is electrically connected with the polarity automatic correction unit (3) and the voltage comparison unit (6);
voltage reference unit (5): providing a reference voltage for the voltage comparison unit, and forming electrical connection with the positive and negative power interfaces (1) and the voltage comparison unit (6);
voltage comparing unit (6): the output signal is output according to the unbalance degree of the positive and negative power supply voltage, and is electrically connected with the positive and negative power supply interface (1), the impedance transformation unit (4), the voltage reference unit (5) and the indication unit (7);
an instruction unit (7): the unbalanced degree of the positive and negative power supply voltages is indicated according to the output level signal of the voltage comparison unit (6), and the positive and negative power supply interface (1) and the voltage comparison unit (6) are electrically connected.
The invention is organically combined by using the main units according to the conception, and the working principle is as follows: the voltage signals of the positive and negative power supplies are provided through the positive and negative power supply interfaces, the difference value of the positive and negative power supplies is calculated through the voltage calculation unit, positive unbalanced voltage is output through the polarity automatic correction unit, the high-impedance voltage signals are converted into low-impedance voltage signals through the impedance conversion unit and are output, the low-impedance voltage signals are sent to the voltage comparison unit, and after the low-impedance voltage signals are compared with the reference voltage signals, signals for driving the light emitting diodes to emit light are output, so that whether the voltage of the positive and negative power supplies is in an unbalanced state or not is indicated.
The invention has the advantages that the voltages of the positive and negative power supplies are detected in real time, the unbalanced state of the positive and negative power supply voltages is indicated, and the power supply fault is removed conveniently.
Drawings
The invention will be further described with reference to the drawings and examples.
Fig. 1 is a schematic block diagram of the circuit of the present invention.
Fig. 2 is a schematic diagram of the circuit connection of an embodiment.
Detailed Description
The present invention will be further described in detail with reference to the drawings and examples, which are provided to illustrate the present invention and not to limit the present invention.
Referring to fig. 1, the positive and negative power supply voltage balance performance indicating device for an experimental apparatus includes: the device comprises a positive and negative power interface (1), a voltage operation unit (2), a polarity automatic correction unit (3), an impedance transformation unit (4), a voltage reference unit (5), a voltage comparison unit (6) and an indication unit (7); the positive and negative power interfaces (1) are connected with positive and negative power sources, supply power to each unit of the device and form electric connection with related units; the voltage operation unit (2) performs heteropolarity addition operation on the voltages of the positive and negative power supplies, and is electrically connected with the positive and negative power supply interface (1) and the polarity automatic correction unit (3); the polarity automatic correction unit (3) automatically corrects the unbalanced negative polarity voltage output by the voltage operation unit (2) into positive polarity voltage, and is electrically connected with the positive and negative power interfaces (1), the voltage operation unit (2) and the impedance transformation unit (4); the impedance transformation unit (4) converts the high-impedance signal output by the polarity automatic correction unit (3) into a low-impedance signal to be output, and is electrically connected with the polarity automatic correction unit (3) and the voltage comparison unit (6); the voltage reference unit (5) provides reference voltage for the voltage comparison unit and is electrically connected with the positive and negative power interfaces (1) and the voltage comparison unit (6); the voltage comparison unit (6) outputs a signal according to the unbalance degree of the positive and negative power supply voltages, and is electrically connected with the positive and negative power supply interface (1), the impedance transformation unit (4), the voltage reference unit (5) and the indication unit (7); the indication unit (7) indicates the unbalance degree of the positive and negative power supply voltages according to the output level signal of the voltage comparison unit (6), and is electrically connected with the positive and negative power supply interface (1) and the voltage comparison unit (6).
Referring further to FIG. 2, the jack CZ1 is a positive and negative power interface, pin 1 is connected to positive power terminal V+, pin 2 is connected to the common ground of the experimental equipment, and pin 3 is connected to negative power terminal V-.
U1 adopts integrated four operational amplifiers, and the model is LM324, and four operational amplifier units of U1A, U1B, U1C, U1D are included.
The voltage operation unit is composed of resistors R1-R3 and an operational amplifier U1A. One end of the resistor R1 is connected to the positive power supply end, and the other end of the resistor R1 is connected to the 2 nd pin of the operational amplifier U1A; one end of the resistor R2 is connected to the negative power supply end, and the other end of the resistor R2 is connected to the 2 nd pin of the operational amplifier U1A; two ends of the resistor R3 are respectively connected to the 2 nd pin and the 1 st pin of the operational amplifier U1A; the 3 rd pin of the operational amplifier U1A is connected to the ground; the 4 th pin of the operational amplifier U1A is connected to the positive power supply end; the 11 th pin of the operational amplifier U1A is connected to the negative power supply terminal. The capacitors C1 and C2 are filter capacitors. The voltage operation unit is used for performing heteropolarity addition operation on the voltages of the positive and negative power supplies, and the unbalanced voltage can be properly amplified by changing the ratio of the resistor R3 to the resistor R1 and the resistor R2.
The polarity automatic correction unit consists of resistors R4-R6, diodes D1 and D2 and an operational amplifier U1B; the impedance transformation unit is composed of an operational amplifier U1C. The resistors R4, R5 and R6 form a T-shaped structure, one ends of the resistors are connected together, the other end of the resistor R4 is connected to the 1 st pin of the operational amplifier U1A, the other end of the resistor R5 is connected to the 6 th pin of the operational amplifier U1B, and the other end of the resistor R6 is connected to the 10 th pin of the operational amplifier U1C; the anode of the diode D1 is connected to the 6 th pin of the operational amplifier U1B, and the cathode is connected to the 7 th pin of the operational amplifier U1B; the anode of the diode D2 is connected to the 7 th pin of the operational amplifier U1B, and the cathode is connected to the 10 th pin of the operational amplifier U1C; the 5 th pin of the operational amplifier U1B is connected to the ground; the 9 th pin of the operational amplifier U1C is connected with the 8 th pin of the U1C.
The voltage reference unit consists of resistors R9-R11, a capacitor C3 and a voltage stabilizing device D3, and voltage is stabilized through the D3, and the resistors R10 and R11 are divided to provide proper reference voltage for the voltage comparison unit.
The voltage comparison unit is acted by an operational amplifier U1D, the comparison voltage is divided by the resistors R7 and R8, and is compared with the voltage on the resistor R11, when the voltage on the resistor R8 is higher than the voltage on the resistor R11, the 14 th pin of the U1D outputs a low-level signal.
The indicating unit is composed of a resistor R12 and a light emitting diode D4, and when the voltage comparing unit outputs a low-level signal, the light emitting diode is lightened so as to indicate the unbalanced state of the positive and negative power supply voltages.
In order to achieve the design purpose and achieve good performance, the following method should be used for selecting element parameters:
the element parameter configuration method of the voltage operation unit comprises the following steps: the resistance R1 and the resistance R2 are equal, and the resistance R3 is used for adjusting the amplification factor, and an embodiment is that r1=r2=r3=10kΩ is selected.
The component parameter configuration method of the polarity automatic correction unit comprises the following steps: the resistance of the resistor R4 is equal to that of the resistor R5, and the resistance of the resistor R6 is half of that of the resistor R4, and in the embodiment, r4=r5=20kΩ and r6=10kΩ are selected.
Claims (3)
1. Positive and negative power supply voltage balance performance indicating device for experimental facilities, which is characterized by comprising: the device comprises a positive and negative power interface (1), a voltage operation unit (2), a polarity automatic correction unit (3), an impedance transformation unit (4), a voltage reference unit (5), a voltage comparison unit (6) and an indication unit (7); wherein:
positive and negative power interfaces (1): the device is connected with a positive power supply and a negative power supply, supplies power to each unit of the device and is electrically connected with related units;
voltage operation unit (2): carrying out heteropolarity addition operation on the voltages of the positive and negative power supplies, and forming electric connection with the positive and negative power supply interface (1) and the polarity automatic correction unit (3);
the voltage operation unit consists of resistors R1-R3 and an operational amplifier U1A; one end of the resistor R1 is connected to the positive power supply end, and the other end of the resistor R1 is connected to the 2 nd pin of the operational amplifier U1A; one end of the resistor R2 is connected to the negative power supply end, and the other end of the resistor R2 is connected to the 2 nd pin of the operational amplifier U1A; two ends of the resistor R3 are respectively connected to the 2 nd pin and the 1 st pin of the operational amplifier U1A; the 3 rd pin of the operational amplifier U1A is connected to the ground; the 4 th pin of the operational amplifier U1A is connected to the positive power supply end; the 11 th pin of the operational amplifier U1A is connected to the negative power supply end;
polarity automatic correction unit (3): the unbalanced negative voltage output by the voltage operation unit (2) is automatically corrected to positive voltage, and the positive voltage and the negative voltage are electrically connected with the positive power interface (1), the voltage operation unit (2) and the impedance transformation unit (4);
the polarity automatic correction unit consists of resistors R4-R6, diodes D1 and D2 and an operational amplifier U1B; the resistors R4, R5 and R6 form a T-shaped structure, one ends of the resistors are connected together, the other end of the resistor R4 is connected to the 1 st pin of the operational amplifier U1A, the other end of the resistor R5 is connected to the 6 th pin of the operational amplifier U1B, and the other end of the resistor R6 is connected to the 10 th pin of the operational amplifier U1C; the anode of the diode D1 is connected to the 6 th pin of the operational amplifier U1B, and the cathode is connected to the 7 th pin of the operational amplifier U1B; the anode of the diode D2 is connected to the 7 th pin of the operational amplifier U1B, and the cathode is connected to the 10 th pin of the operational amplifier U1C; the 5 th pin of the operational amplifier U1B is connected to the ground;
impedance conversion unit (4): the high-impedance signal output by the polarity automatic correction unit (3) is converted into a low-impedance signal to be output, and the low-impedance signal is electrically connected with the polarity automatic correction unit (3) and the voltage comparison unit (6);
the impedance transformation unit consists of an operational amplifier U1C; the 9 th pin of the operational amplifier U1C is connected with the 8 th pin of the U1C;
voltage reference unit (5): providing a reference voltage for the voltage comparison unit, and forming electrical connection with the positive and negative power interfaces (1) and the voltage comparison unit (6);
voltage comparing unit (6): the output signal is output according to the unbalance degree of the positive and negative power supply voltage, and is electrically connected with the positive and negative power supply interface (1), the impedance transformation unit (4), the voltage reference unit (5) and the indication unit (7);
an instruction unit (7): the unbalanced degree of the positive and negative power supply voltages is indicated according to the output level signal of the voltage comparison unit (6), and the positive and negative power supply interface (1) and the voltage comparison unit (6) are electrically connected.
2. The positive and negative power supply voltage balance performance indicating device for an experimental facility according to claim 1, wherein the element parameter configuration method of the voltage operation unit is as follows: the resistance value of the resistor R1 is equal to that of the resistor R2, and the resistor R3 is used for adjusting the amplification factor.
3. The positive and negative power supply voltage balance performance indicating device for an experimental facility according to claim 1, wherein the component parameter configuration method of the automatic polarity correction unit is as follows: the resistance of the resistor R4 is equal to that of the resistor R5, and the resistance of the resistor R6 is half of that of the resistor R4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710119248.3A CN106680737B (en) | 2017-03-02 | 2017-03-02 | Positive and negative power supply voltage balance performance indicating device for experimental equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710119248.3A CN106680737B (en) | 2017-03-02 | 2017-03-02 | Positive and negative power supply voltage balance performance indicating device for experimental equipment |
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| Publication Number | Publication Date |
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| CN106680737A CN106680737A (en) | 2017-05-17 |
| CN106680737B true CN106680737B (en) | 2023-10-31 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1139318A (en) * | 1995-04-27 | 1997-01-01 | 三星电子株式会社 | Voltage balancing circuit |
| CN1707903A (en) * | 2004-06-05 | 2005-12-14 | 摩托罗拉公司 | Cell balancing circuit |
| CN201174408Y (en) * | 2004-10-04 | 2008-12-31 | 布莱克和戴克公司 | Apparatus for monitoring cell of cell pack and apparatus for balancing cell voltage during charging |
| CN205232007U (en) * | 2015-12-09 | 2016-05-11 | 河北世纪恒兴电子技术有限公司 | On -vehicle switching power supply operating condition indicating circuit |
| CN206671512U (en) * | 2017-03-02 | 2017-11-24 | 南京交通职业技术学院 | Experimental facilities positive-negative power balance of voltage performance instruction device |
-
2017
- 2017-03-02 CN CN201710119248.3A patent/CN106680737B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1139318A (en) * | 1995-04-27 | 1997-01-01 | 三星电子株式会社 | Voltage balancing circuit |
| CN1707903A (en) * | 2004-06-05 | 2005-12-14 | 摩托罗拉公司 | Cell balancing circuit |
| CN201174408Y (en) * | 2004-10-04 | 2008-12-31 | 布莱克和戴克公司 | Apparatus for monitoring cell of cell pack and apparatus for balancing cell voltage during charging |
| CN205232007U (en) * | 2015-12-09 | 2016-05-11 | 河北世纪恒兴电子技术有限公司 | On -vehicle switching power supply operating condition indicating circuit |
| CN206671512U (en) * | 2017-03-02 | 2017-11-24 | 南京交通职业技术学院 | Experimental facilities positive-negative power balance of voltage performance instruction device |
Non-Patent Citations (2)
| Title |
|---|
| Amin Ghazanfari 等.A Hierarchical Permutation Cyclic Coding Strategy for Sensorless Capacitor Voltage Balancing in Modular Multilevel Converters.《2015 IEEE》.2015,第1-13页. * |
| 袁志昌等.改善动态相位跟踪和不平衡电压检测性能的改进软锁相环算法.《电网技术》.2010,第34卷(第1期),第31-35页. * |
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