CN204732856U - The sampling of inversion output transformer exciting current and current-limiting protection device - Google Patents
The sampling of inversion output transformer exciting current and current-limiting protection device Download PDFInfo
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- CN204732856U CN204732856U CN201520529929.3U CN201520529929U CN204732856U CN 204732856 U CN204732856 U CN 204732856U CN 201520529929 U CN201520529929 U CN 201520529929U CN 204732856 U CN204732856 U CN 204732856U
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- 238000005070 sampling Methods 0.000 title claims abstract description 34
- 230000001681 protective effect Effects 0.000 claims abstract description 19
- 229920006395 saturated elastomer Polymers 0.000 abstract description 2
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Abstract
The utility model relates to the sampling of a kind of inversion output transformer exciting current and current-limiting protection device, comprise an inversion module, described inversion module is a full-bridge inverting module, comprise the first power switch pipe Q1 to the 4th power switch pipe Q4, described device also comprises an exciting current sample circuit, a comparison circuit and a protective circuit; The input of described exciting current sample circuit is connected with an inversion output transformer; in order to the exciting current of described inversion output transformer of sampling; the output of described exciting current sample circuit is connected to the positive input terminal of described comparison circuit; negative input termination one reference level of described comparison circuit; the output of described comparison circuit is connected to the input of described protective circuit, and the output of described protective circuit is connected to described inversion module.The utility model can carry out current limliting separately to exciting current, avoid positive half wave or negative half-wave current excessive and cause output transformer saturated and damage inversion module power device.
Description
Technical field
The utility model relates to electronic circuit field, particularly a kind of inversion output transformer exciting current sampling and current-limiting protection device.
Background technology
A few days ago in technology, the exciting current of output transformer of inverter is sampled separately and abnormality processing, and when some factors cause transformer bias, exciting current strengthens, if cannot carry out current limliting to exciting current in time, then easily the power device of inversion module damages.
Summary of the invention
In view of this; the purpose of this utility model is to provide the sampling of a kind of inversion output transformer exciting current and current-limiting protection device; current limliting can be carried out separately to exciting current; avoid positive half wave or negative half-wave current excessive; cause output transformer saturated; cause inversion module power device to damage, solve the problem of prior art needleless to the independent current limliting of exciting current.
The utility model adopts following scheme to realize: a kind of inversion output transformer exciting current sampling and current-limiting protection device, comprise an inversion module, inversion module comprises a full-bridge inverting module, an inversion output transformer and an electric capacity C2, described full-bridge inverting module comprises the first power switch pipe Q1, the second power switch pipe Q2, the 3rd power switch pipe Q3 and the 4th power switch pipe Q4, the primary side of described inversion output transformer is connected in parallel to the output of described full-bridge inverting module, and described electric capacity C2 is connected in parallel to the load end of described inversion output transformer; Described device also comprises an exciting current sample circuit, a comparison circuit and a protective circuit; The input of described exciting current sample circuit is connected with described inversion output transformer, described exciting current sample circuit is in order to the exciting current of described inversion output transformer of sampling, the output of described exciting current sample circuit is connected to the positive input terminal of described comparison circuit, negative input termination one reference level of described comparison circuit, the output of described comparison circuit is connected to the input of described protective circuit, and the output of described protective circuit is connected to described inversion module; Described protective circuit closes the driving of the first power switch pipe Q1 in described full-bridge inverting module, the second power switch pipe Q2, the 3rd power switch pipe Q3 and the 4th power switch pipe Q4 in order to send guard signal.
Further, described exciting current sample circuit comprises the first Current Transmit 1, second Current Transmit 2, first voltage sampling circuit, the second voltage sampling circuit and subtraction circuit; Described first Current Transmit 1 primary side is connected with the primary side of inversion output transformer and is connected to the output of described inversion module respectively, and described first Current Transmit, 1 level two ends are connected to the first voltage sampling circuit respectively; The output of described first voltage sampling circuit is connected to an input of described subtraction circuit; Described second Current Transmit 2 primary side connect with the load end of inversion output transformer after described electric capacity C2 in parallel, described second Current Transmit, 2 level two ends are connected to the second voltage sampling circuit respectively; The output of described second voltage sampling circuit is connected to another input of described subtraction circuit; The output of described subtraction circuit is as the output of described exciting current sample circuit.
Further, two instrument transformers are adopted to sample to the exciting current of described inversion output transformer T, the sample electric current that obtains of first Current Transmit 1 is exciting current and the output load current sum of described inversion output transformer T, be designated as I1+Iout, second Current Transmit 2 electric current obtained of sampling is load current, is designated as Iout; First, second current transformer is sampled respectively and is obtained voltage signal U1, U2, and correspondence subtracts each other the exciting current sampled signal drawing transformer after subtraction circuit, then compares through a comparison circuit, produces a signal and is sent to protective circuit; Described protective circuit sends the driving that guard signal closes inversion module Q1, Q2, Q3 and Q4 tetra-power switch pipes, ensures that its output current will cause inversion module power switch to damage by overcurrent.
Compared to prior art, the utility model effectively can carry out current limliting during inversion output transformer exciting current exception, to the excitation abnormal current that transformer bias causes, carry out sampling current limliting, avoid the damage of inversion module power device, improve its reliability current sample and adopt current transformer sampling, the loss of minimizing, has preferably practicality.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model.
Fig. 2 is circuit diagram of the present utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described further.
The present embodiment provides a kind of inversion output transformer exciting current to sample and current-limiting protection device, as depicted in figs. 1 and 2, comprise an inversion module, inversion module comprises a full-bridge inverting module, an inversion output transformer and an electric capacity C2, described full-bridge inverting module comprises the first power switch pipe Q1, the second power switch pipe Q2, the 3rd power switch pipe Q3 and the 4th power switch pipe Q4, the primary side of described inversion output transformer is connected in parallel to the output of described full-bridge inverting module, and described electric capacity C2 is connected in parallel to the load end of described inversion output transformer; Described device also comprises an exciting current sample circuit, a comparison circuit and a protective circuit; The input of described exciting current sample circuit is connected with described inversion output transformer, described exciting current sample circuit is in order to the exciting current of described inversion output transformer of sampling, the output of described exciting current sample circuit is connected to the positive input terminal of described comparison circuit, negative input termination one reference level of described comparison circuit, the output of described comparison circuit is connected to the input of described protective circuit, and the output of described protective circuit is connected to described inversion module; Described protective circuit closes the driving of the first power switch pipe Q1 in described full-bridge inverting module, the second power switch pipe Q2, the 3rd power switch pipe Q3 and the 4th power switch pipe Q4 in order to send guard signal.
In the present embodiment, described exciting current sample circuit comprises the first Current Transmit 1, second Current Transmit 2, first voltage sampling circuit, the second voltage sampling circuit and subtraction circuit; Described first Current Transmit 1 primary side is connected with the primary side of inversion output transformer and is connected to the output of described inversion module respectively, and described first Current Transmit, 1 level two ends are connected to the first voltage sampling circuit respectively; The output of described first voltage sampling circuit is connected to an input of described subtraction circuit; Described second Current Transmit 2 primary side connect with the load end of inversion output transformer after described electric capacity C2 in parallel, described second Current Transmit, 2 level two ends are connected to the second voltage sampling circuit respectively; The output of described second voltage sampling circuit is connected to another input of described subtraction circuit; The output of described subtraction circuit is as the output of described exciting current sample circuit.
In the present embodiment, two instrument transformers are adopted to sample to the exciting current of described inversion output transformer T, the sample electric current that obtains of first Current Transmit 1 is exciting current and the output load current sum of described inversion output transformer T, be designated as I1+Iout, second Current Transmit 2 electric current obtained of sampling is load current, is designated as Iout; First, second current transformer is sampled respectively and is obtained voltage signal U1, U2, and correspondence subtracts each other the exciting current sampled signal drawing transformer after subtraction circuit, then compares through a comparison circuit, produces a signal and is sent to protective circuit; Described protective circuit sends the driving that guard signal closes inversion module Q1, Q2, Q3 and Q4 tetra-power switch pipes, ensures that its output current will cause inversion module power switch to damage by overcurrent.
The foregoing is only preferred embodiment of the present utility model, all equalizations done according to the utility model claim change and modify, and all should belong to covering scope of the present utility model.
Claims (2)
1. an inversion output transformer exciting current sampling and current-limiting protection device, comprise an inversion module, inversion module comprises a full-bridge inverting module, one inversion output transformer and an electric capacity C2, described full-bridge inverting module comprises the first power switch pipe Q1, second power switch pipe Q2, 3rd power switch pipe Q3 and the 4th power switch pipe Q4, the primary side of described inversion output transformer is connected in parallel to the output of described full-bridge inverting module, described electric capacity C2 is connected in parallel to the load end of described inversion output transformer, it is characterized in that: also comprise an exciting current sample circuit, one comparison circuit and a protective circuit, the input of described exciting current sample circuit is connected with described inversion output transformer, described exciting current sample circuit is in order to the exciting current of described inversion output transformer of sampling, the output of described exciting current sample circuit is connected to the positive input terminal of described comparison circuit, negative input termination one reference level of described comparison circuit, the output of described comparison circuit is connected to the input of described protective circuit, and the output of described protective circuit is connected to described inversion module, described protective circuit closes the driving of the first power switch pipe Q1 in described full-bridge inverting module, the second power switch pipe Q2, the 3rd power switch pipe Q3 and the 4th power switch pipe Q4 in order to send guard signal.
2. a kind of inversion output transformer exciting current sampling according to claim 1 and current-limiting protection device, is characterized in that: described exciting current sample circuit comprises the first Current Transmit 1, second Current Transmit 2, first voltage sampling circuit, the second voltage sampling circuit and subtraction circuit;
Described first Current Transmit 1 primary side is connected with the primary side of inversion output transformer and is connected to the output of described inversion module respectively, and described first Current Transmit, 1 level two ends are connected to the first voltage sampling circuit respectively; The output of described first voltage sampling circuit is connected to an input of described subtraction circuit;
Described second Current Transmit 2 primary side connect with the load end of inversion output transformer after described electric capacity C2 in parallel, described second Current Transmit, 2 level two ends are connected to the second voltage sampling circuit respectively; The output of described second voltage sampling circuit is connected to another input of described subtraction circuit;
The output of described subtraction circuit is as the output of described exciting current sample circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520529929.3U CN204732856U (en) | 2015-07-21 | 2015-07-21 | The sampling of inversion output transformer exciting current and current-limiting protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520529929.3U CN204732856U (en) | 2015-07-21 | 2015-07-21 | The sampling of inversion output transformer exciting current and current-limiting protection device |
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| Publication Number | Publication Date |
|---|---|
| CN204732856U true CN204732856U (en) | 2015-10-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520529929.3U Expired - Fee Related CN204732856U (en) | 2015-07-21 | 2015-07-21 | The sampling of inversion output transformer exciting current and current-limiting protection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115144642A (en) * | 2022-07-08 | 2022-10-04 | 东南大学 | Excitation current lossless sampling circuit applied to isolation converter |
-
2015
- 2015-07-21 CN CN201520529929.3U patent/CN204732856U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115144642A (en) * | 2022-07-08 | 2022-10-04 | 东南大学 | Excitation current lossless sampling circuit applied to isolation converter |
| CN115144642B (en) * | 2022-07-08 | 2023-12-29 | 东南大学 | Excitation current nondestructive sampling circuit applied to isolation converter |
| WO2024007555A1 (en) * | 2022-07-08 | 2024-01-11 | 东南大学 | Excitation current lossless sampling circuit used for isolation converter |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151028 |
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| CF01 | Termination of patent right due to non-payment of annual fee |