CN1398038A - Method and device for sampling source voltage - Google Patents
Method and device for sampling source voltage Download PDFInfo
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- CN1398038A CN1398038A CN 01127640 CN01127640A CN1398038A CN 1398038 A CN1398038 A CN 1398038A CN 01127640 CN01127640 CN 01127640 CN 01127640 A CN01127640 A CN 01127640A CN 1398038 A CN1398038 A CN 1398038A
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Abstract
This invention discloses a source voltage sampling method and its device about setting an input voltage sampling circuit in the secondary coil of switch transformer of inverse switch power and sending the sampling voltage into a converter circuit adjusting the output energy timely to guarantee the stability of the frequency conversion system. This invention has the advantages of simple circuit structure good isoaltion between intense current and weak current, safe weak electric signal circuit which is easily tested, adjusted, maintained. This invention can be widely used in frequency conversion power or other electric appliance, or systems asking for the source voltage samplings.
Description
Technical field
The present invention relates to the voltage sampling regulation technology, be specifically related to a kind ofly can carry out the method for proportional sampling to the source voltage of input, the invention still further relates to and a kind ofly can be used in the variable frequency power supply, the source voltage of input is carried out the device of proportional sampling based on said method.
Background technology
In variable frequency power supply, dc voltage value behind the commercial power rectification is a crucial parameter, and the variation of input voltage will produce bigger influence to the job stability of frequency conversion system, for realizing detecting the changing value of input voltage, and then according to the changing value adjusting of input voltage and the output energy of control of conversion power supply, make frequency conversion system work more stable, therefore in the power circuit of frequency conversion system, all be provided with the source voltage sampling device that is used to detect the input voltage changing value, the voltage sampling structure that is now adopted mainly contains two kinds, a kind of is to adopt simple electric resistance partial pressure sampling, and this structure is difficult to realize forceful electric power and the light current physical isolation aspect electric; Because of control circuit and the not isolation of forceful electric power electrical network, control circuit is fragile, and security incident also takes place when maintenance easily; The structure that also has a kind of utilization " vibration-transformer isolation " is though this structure can realize voltage isolation sampling, complex structure, cost height; Also there is the not high shortcoming of accuracy of detection in existing sample circuit, thereby influences the work of frequency conversion system.
Accompanying drawing 1 and accompanying drawing 2 show above-mentioned two kinds of source voltage sample circuit principles that are usually used in the variable frequency power supply:
In Fig. 1, connect civil power between the L-N through Q1, the C1 rectification, filtering, the P point voltage is the direct voltage after the rectification, and R1, R2 are simple electric resistance partial pressure sampling, and the S point voltage is a sampling voltage.But on being connected, do not realize in circuit physical isolation between S point and L, N, the P.
In Fig. 2, connect civil power between the L-N through Q1, C1 rectification, filtering.The P point voltage is the direct voltage after the rectification.R1, R2 are simple electric resistance partial pressure, through vibration, and transformer isolation, detection, the voltage that S is ordered is sampling voltage.Though the S point has electricity every pressure with L, N, P point.But this sample circuit structure complexity, the sampling accuracy of detection is low, the cost height.
Fig. 6 is the electric theory diagram of general flyback switch voltage-stabilized source.K-L connects civil power, form high-voltage DC power supply through BRIDGE1 rectification and C2 filtering, I-J is the output of power supply, and R1, R2 form the sampling of output voltage, through compare with benchmark, error is amplified and photoelectricity offers control circuit after isolating, the conducting of control circuit control switch with end.During switch conduction, high-voltage DC power supply fills energy [magnetizing] for switch transformer T1; When switch ended, switch transformer to the circuit charging, was exported energy through secondary.It is a degeneration factor, and final I-J obtains a basicly stable direct voltage, and this often is the electric principle of a kind of flyback switch voltage-stabilized source of use.
Summary of the invention
The technical problem that the present invention will solve is, a kind of source voltage sampling method that is used for variable frequency power supply is provided, and this method can make that the source voltage sampling of variable frequency power supply is safer, and the sampling precision of voltage is higher.
Another technical problem that the present invention will solve is, a kind of source voltage sampling device that is used for variable frequency power supply is provided, and this device can guarantee that structurally sample circuit and mains circuit realize isolating fully, and sampling value is accurate, and simple in structure, is easy to realize.
Addressing the above problem technical scheme is: construct a kind of source voltage sampling method that is used for variable frequency power supply, it is characterized in that, may further comprise the steps:
A), adopt inverse-excitation type switch power-supply, and in the voltage output secondary coil of the switch transformer of Switching Power Supply, connect a source voltage sample circuit, or in switch transformer, increase by one group of secondary coil, on the secondary coil that increases, connect a source voltage sample circuit;
B), when the switching tube conducting, source voltage sample circuit work, during switch transformer magnetized, the secondary coil that links to each other was obtained the sample value of source voltage to the charging of source voltage sample circuit; When switching tube ended, during the switch transformer releasing magnetic energy, the source voltage sample circuit did not charge.The same peak detectors such as effect of source voltage sample circuit.
C) end of the same name with respect to primary coil of the secondary coil that links to each other with the source voltage sample circuit of getting of correct choosing is guaranteed b) item can realize.
D), voltage sample circuit detected input voltage sample value in source is delivered in the variable frequency power supply control circuit;
E), the variable frequency power supply control circuit is regulated the output of variable frequency power supply according to detected source voltage sample value.
Construct a kind of source voltage sampling device that is used for variable frequency power supply, comprise switch transformer, the inverse-excitation type switch power-supply control circuit that is connected with the switch transformer primary coil, it is characterized in that, at least be provided with one group of voltage output secondary coil in the described switch transformer, be connected with switch power supply output circuit on the secondary coil, described switch power supply output circuit is pressed the work of inverse-excitation type switch power-supply principle, promptly when switching tube ends, switch transformer discharges to switch power supply output circuit, through the output voltage sampling, light-coupled isolation feeds back to the inverse-excitation type switch power-supply control circuit; Connect active voltage sample circuit on the described secondary coil, the secondary coil that connects the source voltage sample circuit can be special-purpose, also can be public with other circuit.No matter be what kind of form, the sampling of source voltage sample circuit always when the switching tube conducting, is finished during switch transformer magnetizes; The output interface of described source voltage sample circuit is connected with the circuit for regulating and controlling of variable frequency power supply.
From the described technical scheme that is used for source voltage sampling method and device of the invention described above as can be known, the present invention is not very complicated on the structure of sampling theorem and sampler, but but solved in the former frequency conversion system, because the caused circuit safety coefficient of defective of voltage sampling method and sampler is low, or sample circuit complexity, accuracy is low to be waited and can not get the problem that solves for a long time, compare with primary voltage sampling method and sampler, have the following advantages: the present invention is provided with sample circuit in the secondary coil of switch transformer, on circuit structure, can make source voltage sample circuit and input electrical network isolate fully, thereby guarantee the safety of source voltage sample circuit; Sampling voltage is with the linear variation relation of source voltage, accuracy height; The source voltage sample circuit of safety is connected the control circuit of having realized frequency conversion system and isolates fully with the input electrical network with the control circuit of frequency conversion system, improved the fail safe of frequency conversion system; Also strengthened the antijamming capability of frequency conversion system control circuit, can make the control accuracy of frequency conversion system improve, operation stability improves.
In the present invention, utilized in the inverse-excitation type switch power-supply, during the switching tube conducting, the switch transformer primary voltage equals source voltage, secondary voltage and the ratio of primary voltage equal the turn ratio of secondary coil and primary coil, and the secondary voltage that extracts this moment promptly obtains the linear sample value of source voltage.End at switching tube, during the switch transformer releasing magnetic energy, the source voltage sample circuit does not extract secondary voltage.
Description of drawings
Fig. 1 is the electrical schematic diagram of one of former variable frequency power supply sample circuit;
Fig. 2 is two a electrical schematic diagram of former variable frequency power supply sample circuit;
Fig. 3 is the electric principle schematic of source voltage sample circuit device embodiment one among the present invention;
Fig. 4 is the electric principle schematic of source voltage sample circuit device embodiment two among the present invention;
Fig. 5 is voltage sample circuit ac equivalent circuit relevant with the source voltage sampling when the switching tube conducting in source among Fig. 3,4;
Fig. 6 is the theory diagram of general flyback switch voltage-stabilized source;
Fig. 7 is applied in electric theory diagram in the variable frequency power supply for the present invention.
Embodiment
Usually, in inverse-excitation type switch power-supply, when the switching tube conducting in the power supply, the switch transformer intake of input voltage source in being arranged on circuit also stored; When switching tube by the time, the energy that switch transformer output is stored, and the energy of the output energy that equals to import.And all when switching tube ends, carry out by switch transformer output energy; Core methed of the present invention is when the switching tube conducting, by switch transformer output energy.Concrete grammar is, when the switching tube conducting, the voltage of input voltage source all is added in the elementary of switch transformer, utilize the magnetic coupling of transformer, the voltage of the secondary output of transformer is directly proportional with the voltage of elementary input, extract the secondary voltage of this moment, can judge elementary input power source voltage, the voltage that is extracted is linear with the voltage of elementary input basically, by the secondary sample circuit that is provided with at switch transformer, the security performance of sample circuit can be guaranteed, the accuracy of sampling voltage can be improved again.
Sampling method based on above-mentioned source voltage, the invention provides the source voltage sampling device (being applied in the Switching Power Supply) of two kinds of structures, one provenance voltage sampling device as shown in Figure 4, be in the secondary coil of the switch transformer of inverse-excitation type switch power-supply, a source voltage sampling voltage follower circuit to be set, output dc voltage between the output G-H of secondary coil, when the switching tube conducting, be to be directly proportional with the voltage that is added in primary coil A-B two ends, the source voltage sample circuit can be with the changing value of detected input voltage like this, with the linear change value that is directly proportional, be sent in the circuit for regulating and controlling of frequency conversion system, make frequency changer circuit in time adjust the output energy, guarantee the working stability of frequency conversion system.
The structure of another provenance voltage sampling device is to increase by one group of secondary coil in the switch transformer of inverse-excitation type switch power-supply as shown in Figure 3, is specifically designed to detection of primary input power source voltage, and its sampling operation principle is identical with first kind with the output control principle.
Source provided by the present invention voltage sampling device, no matter be increase by one secondary or utilize that of original switch transformer is secondary to come detection of primary input power source voltage, all be to have utilized in the inverse-excitation type switch power-supply, during the switching tube conducting, the power transfer in the switch transformer.In general, adopt source voltage sampling device as shown in Figure 3, use more convenient.According to source provided by the present invention voltage sampling method, can design the sampler of many provenance voltages, above-mentioned Fig. 3, sampler shown in Figure 4 are two embodiment wherein.
Figure 5 shows that the ac equivalent circuit relevant when the switching tube conducting of source voltage sample circuit among Fig. 3,4 with the source voltage sampling.Can further specify the validity of method of the present invention and device by shown in Figure 5 and following computational process.
In Fig. 5, primary coil two-end-point voltage Vab, primary turns is n1, and secondary coil two-end-point voltage is Vcd, and number of secondary turns is n2.Source voltage is Vc2, and sample voltage is Vgh.
Vcd＝(n2/n1)*Vab
When the switching tube conducting [because Vc2 is much larger than the switching tube saturation voltage drop], Vab=Vc2
So Vcd=(n2/n1) * Vc2
Secondary through D2 to the charging of R3, C3 network.
Can make the forward voltage drop of Vcd during design much larger than D2,
So Vgh=Vcd
Vgh＝(n2/n1)*Vc2
When switching tube ends, Vab ≠ Vc2
Because polarity was opposite when this moment, Vcd was with the switching tube conducting, D2 ends.Electric charge on the C3 is through R3 and load discharge, and constant then can be guaranteed Vcd ≈ (n2/n1) * Vc2 in Switching Power Supply much larger than the discharge time slot during design discharge in the open/close whole cycle.
By input voltage sampler provided by the present invention, it is simple to have a circuit, and cost is low, the precision height, and high conformity, forceful electric power and light current isolation are good, and the weak electric signal circuit safety is good, and the weak electric signal circuit is easy to measure, adjust maintenance, advantages such as strong interference immunity.
The present invention can be widely used in variable frequency power supply or other source current that need take a sample, can finish the input voltage sampling safety and precise; Be particularly useful in the convertible frequency air-conditioner, detect the DC power supply voltage of supplying with final stage IPM or IGBT group; Also can be used for electrical equipment or system that other need carry out the source voltage sampling.
Claims (3)
1, a provenance voltage sampling method is characterized in that, may further comprise the steps:
A), adopt inverse-excitation type switch power-supply, in the voltage output secondary coil of switch transformer, connect a source voltage sample circuit or in switch transformer, increase by one group of secondary coil, on the secondary coil that increases, connect a source voltage sample circuit;
B), when the switching tube conducting, the source voltage sample circuit is obtained the sample value of source voltage; End at switching tube, during the switch transformer releasing magnetic energy, the source voltage sample circuit is not worked, the same peak detectors such as effect of source voltage sample circuit;
C), voltage sample circuit detected input voltage sample value in source is delivered in the working power control circuit;
D), the working power control circuit is regulated the output of working power according to detected source voltage sample value.
2, a kind of device that is used for the source voltage sampling, comprise switch transformer, it is characterized in that, be provided with at least one group of voltage output secondary coil in the described switch transformer, connect active voltage sample circuit on the described secondary coil, the output interface of described source voltage sample circuit is connected with the control circuit of variable frequency power supply.
3, according to the described device that is used for the source voltage sampling of claim 2, it is characterized in that, be provided with two groups of voltage output secondary coils in the described switch transformer, connect active voltage sample circuit on one group of secondary coil therein, the output interface of described source voltage sample circuit is connected with the control circuit of variable frequency power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01127640 CN1219350C (en) | 2001-07-17 | 2001-07-17 | Method and device for sampling source voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01127640 CN1219350C (en) | 2001-07-17 | 2001-07-17 | Method and device for sampling source voltage |
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| Publication Number | Publication Date |
|---|---|
| CN1398038A true CN1398038A (en) | 2003-02-19 |
| CN1219350C CN1219350C (en) | 2005-09-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01127640 Expired - Fee Related CN1219350C (en) | 2001-07-17 | 2001-07-17 | Method and device for sampling source voltage |
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| CN (1) | CN1219350C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005011095A1 (en) * | 2003-07-28 | 2005-02-03 | System General Corp. | Primary-side controlled flyback power converter |
| CN100433519C (en) * | 2003-10-10 | 2008-11-12 | 汤姆森特许公司 | Switch mode power supply |
| CN100438598C (en) * | 2006-03-17 | 2008-11-26 | 深圳创维－Rgb电子有限公司 | Reverse-excitation power supply |
| CN101871996A (en) * | 2009-04-23 | 2010-10-27 | 科孚德有限公司 | Be used to test the energy producing unit that can be connected or the Method and circuits of energy absorption device with electrical network |
| CN102013808A (en) * | 2010-12-10 | 2011-04-13 | 广东美的电器股份有限公司 | Output voltage isolation sampling circuit for DC-DC conversion and control method of output voltage isolation sampling circuit |
| US9658258B2 (en) | 2014-06-11 | 2017-05-23 | Delta Electronics (Shanghai) Co., Ltd. | Power conversion system and voltage sampling device thereof |
-
2001
- 2001-07-17 CN CN 01127640 patent/CN1219350C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005011095A1 (en) * | 2003-07-28 | 2005-02-03 | System General Corp. | Primary-side controlled flyback power converter |
| CN100433519C (en) * | 2003-10-10 | 2008-11-12 | 汤姆森特许公司 | Switch mode power supply |
| CN100438598C (en) * | 2006-03-17 | 2008-11-26 | 深圳创维－Rgb电子有限公司 | Reverse-excitation power supply |
| CN101871996A (en) * | 2009-04-23 | 2010-10-27 | 科孚德有限公司 | Be used to test the energy producing unit that can be connected or the Method and circuits of energy absorption device with electrical network |
| CN101871996B (en) * | 2009-04-23 | 2015-11-25 | 科孚德有限公司 | For testing the Method and circuits of energy producing unit or the energy absorption device that can be connected with electrical network |
| CN102013808A (en) * | 2010-12-10 | 2011-04-13 | 广东美的电器股份有限公司 | Output voltage isolation sampling circuit for DC-DC conversion and control method of output voltage isolation sampling circuit |
| CN102013808B (en) * | 2010-12-10 | 2013-05-08 | 广东美的电器股份有限公司 | Output voltage isolation sampling circuit for DC-DC conversion and control method of output voltage isolation sampling circuit |
| US9658258B2 (en) | 2014-06-11 | 2017-05-23 | Delta Electronics (Shanghai) Co., Ltd. | Power conversion system and voltage sampling device thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1219350C (en) | 2005-09-14 |
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