CN102103157B - Direct voltage isolated sampling device - Google Patents
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- CN102103157B CN102103157B CN 200910215307 CN200910215307A CN102103157B CN 102103157 B CN102103157 B CN 102103157B CN 200910215307 CN200910215307 CN 200910215307 CN 200910215307 A CN200910215307 A CN 200910215307A CN 102103157 B CN102103157 B CN 102103157B
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Abstract
The present invention relates to a direct voltage isolated sampling device comprising a switch module (100) and a transformer (T1), wherein a primary-edge first input terminal of the transformer (T1) receives direct voltage (Vdc) and a primary-edge second input terminal of the transformer (T1) is connected with a first terminal of the switch module (100); a second terminal of the switch module is grounded; and a secondary-edge of the transformer (T1) outputs a secondary-edge sampling signal when the switch module (100) is conducted. The direct voltage isolated sampling device provided by the present invention can carry out isolated transmission and sampling without requirement for any optical coupler by changing direct voltage signals into switching values through the transformer and the switch module so that the cost is lower and the reliability is high.
Description
Technical field
The present invention relates to the voltage measurement field, more particularly, relate to a kind of direct voltage isolated sampling device.
Background technology
In voltage measurement and controlling, usually adopt low-voltage device that high-voltage signal and/or large current signal are measured.Reliable in order to guarantee circuit safety, improve simultaneously the antijamming capability of circuit, need to carry out electrical equipment isolation, reinforced insulation simultaneously to low-voltage device.
In modular power, in order to satisfy the requirements such as circuit precision, bandwidth, response time, the main high-speed linear optocoupler that uses of the isolation sampling of DC voltage.Yet the high-speed linear optocoupler not only holds at high price, and the stability of its current transfer ratio (the namely ratio of electric current of the electric current of the output photoelectric pipe of optocoupler and input LED) is not high.Therefore, thus this current transfer ratio usually easily change have influence on the isolation sample circuit stability.Therefore, need a kind of cost lower, the direct voltage isolated sampling device that reliability is high.
Summary of the invention
The technical problem to be solved in the present invention is, the high-speed linear optocoupler high cost and the unsettled defective of current transfer ratio that are used for isolation sampling DC voltage for prior art provide a kind of cost lower, the direct voltage isolated sampling device that reliability is high.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of direct voltage isolated sampling device, comprising: switch module and transformer; Former limit the second input end that the former limit first input end of wherein said transformer receives DC voltage, described transformer is connected to the first end of described switch module, the second end ground connection of described switch module; When described switch module conducting, the secondary of described transformer output secondary sampled signal;
Wherein said transformer becomes switching value to isolate transmission and sampling described dc voltage conversion with described switch module.
In direct voltage isolated sampling device of the present invention, described direct voltage isolated sampling device further comprises for the treatment of described secondary sampled signal to generate the secondary signal processing module of effective secondary sampled signal; The second input end that the first input end of described secondary signal processing module is connected to secondary first output terminal of described transformer, described secondary signal processing module is connected to secondary second output terminal of described transformer to receive described secondary sampled signal, the described effective secondary sampled signal of sampled signal output terminal output of described secondary signal processing module.
In direct voltage isolated sampling device of the present invention, described switch module comprises switching tube and driving circuit; The grid of wherein said switching tube is connected to described driving circuit and drives signal to receive, and based on described driving signal conduction or shutoff, the source ground of described switching tube, drain electrode are connected to former limit second input end of described transformer.
In direct voltage isolated sampling device of the present invention, described switching tube is mos field effect transistor or insulated gate bipolar transistor.
In direct voltage isolated sampling device of the present invention, described driving circuit is isolated drive circuit.
In direct voltage isolated sampling device of the present invention, described driving circuit is non-isolated drive circuit.
In direct voltage isolated sampling device of the present invention, described direct voltage isolated sampling device further comprises the first magnetic reset circuit that is used for the described transformer of magnetic reset between former limit second input end of the former limit first input end that is arranged on described transformer and described transformer.
In direct voltage isolated sampling device of the present invention, described direct voltage isolated sampling device further comprises the second magnetic reset circuit that is used for the described switch module of magnetic reset between the second end of the first end that is arranged on described switch module and described switch module.
In direct voltage isolated sampling device of the present invention, described secondary signal processing module comprises transformation of scale unit for the treatment of described secondary sampled signal, proportional integral converter unit, proportion integration differentiation converter unit, be used for the filter unit of the described secondary sampled signal of filtering or be used for the clamp units of the voltage of the described secondary sampled signal of clamper.
In direct voltage isolated sampling device of the present invention, described secondary signal processing module comprises clamp units and filter unit, wherein said clamp units is connected to the secondary of described transformer with the described secondary sampled signal of clamper, described filter unit is connected to described clamp units receiving the secondary sampled signal after clamper, and the secondary sampled signal after described clamper is carried out filtering.
In direct voltage isolated sampling device of the present invention, described secondary signal processing module further comprises the one in described transformation of scale unit, proportional integral converter unit, proportion integration differentiation converter unit, and the one in described transformation of scale unit, proportional integral converter unit, proportion integration differentiation converter unit is connected to described filter unit so that the secondary sampled signal after the filtering clamp is processed.
In direct voltage isolated sampling device of the present invention, described secondary signal processing module comprises one and the filter unit in described transformation of scale unit, proportional integral converter unit, proportion integration differentiation converter unit, wherein said filter unit is connected to the secondary of described transformer with the described secondary sampled signal of filtering, and the one in described transformation of scale unit, proportional integral converter unit, proportion integration differentiation converter unit is connected to described filter unit so that filtered secondary sampled signal is processed.
In direct voltage isolated sampling device of the present invention, described secondary signal processing module comprises one and the clamp units in described transformation of scale unit, proportional integral converter unit, proportion integration differentiation converter unit, wherein said clamp units is connected to the secondary of described transformer with the described secondary sampled signal of clamper, and the one in described transformation of scale unit, proportional integral converter unit, proportion integration differentiation converter unit is connected to described clamp units so that the secondary sampled signal after clamp is processed.
Implement direct voltage isolated sampling device of the present invention, by transformer and switch module, d. c. voltage signal is become switching value and isolate transmission and sampling, need not to use optocoupler, thereby cost is lower and reliability is high.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in accompanying drawing:
Fig. 1 is the schematic block circuit diagram of the first embodiment of direct voltage isolated sampling device of the present invention;
Fig. 2 is the schematic block circuit diagram of the second embodiment of direct voltage isolated sampling device of the present invention;
Fig. 3 is the oscillogram of direct voltage isolated sampling device shown in Figure 2;
Fig. 4 is the schematic block circuit diagram of the 3rd embodiment of direct voltage isolated sampling device of the present invention;
Fig. 5 is the schematic block circuit diagram of the 4th embodiment of direct voltage isolated sampling device of the present invention.
Embodiment
Fig. 1 is the schematic block circuit diagram of the first embodiment of direct voltage isolated sampling device of the present invention.As shown in Figure 1, direct voltage isolated sampling device of the present invention comprises switch module 100 and transformer T1.The first end that the former limit first input end reception DC voltage Vdc of described transformer T1, former limit the second input end are connected to described switch module 100.The second end ground connection of described switch module 100.The secondary of described transformer T1 is exported secondary sampled signal Vsample when described switch module 100 conducting.
Its principle of work is as follows, and when switch module 100 conducting, DC voltage Vdc is through transformer T1 isolation and voltage transformation, at the secondary output secondary sampled signal Vsample of transformer T1.When switch module 100 turn-offed, the signal of the secondary output of transformer T1 was invalid signals, and the secondary that is connected to transformer uses subordinate's circuit of its secondary output signal (as load, signal processing circuit etc.) can not use this invalid signals.In simplified embodiment of the present invention, by the former limit of adjustment transformer and the turn ratio of secondary coil, the secondary sampled signal of the secondary output of transformer T1 need not to carry out next step processing, just can and control and use for subordinate's electric circuit inspection.
In the embodiment show in figure 1, described switch module 100 can be the device for power switching that driven by driving circuit, can be also to control manually or automatically intelligent switch module closed and that turn-off by the user, can be even also common manual or automatic switch device.
Fig. 2 is the schematic block circuit diagram of the second embodiment of direct voltage isolated sampling device of the present invention.As shown in Figure 2, direct voltage isolated sampling device of the present invention comprises transformer T1, switching tube Q1, driving circuit 101 and secondary signal processing module 200.The drain electrode that the former limit first input end reception DC voltage Vdc of described transformer T1, former limit the second input end are connected to described switching tube Q1.The grid of described switching tube Q1 is connected to described driving circuit 101 with reception driving signal and based on described driving signal conduction or shutoff, the source ground of described switching tube Q1.The first input end of described secondary signal processing module 200 is connected to secondary the first output terminal of described transformer T1, secondary the second output terminal that the second input end is connected to described transformer T1 to receive described secondary sampled signal Vsample and it is processed, and the below will be introduced the processing that can carry out.
In the present embodiment, the introducing of described secondary signal processing module 200 is to process for the secondary sampled signal that the secondary from transformer T1 is received, so that obtain to be fit to effective secondary sampled signal that subordinate's circuit uses.
Therefore can comprise in this secondary signal processing module 200 secondary that is connected to described transformer T1 with for the treatment of transformation of scale unit 201, proportional integral converter unit 202, the proportion integration differentiation converter unit of described secondary sampled signal, be used for the filter unit 204 of the described secondary sampled signal of filtering or be used for the clamp units 205 of the voltage of the described secondary sampled signal of clamper.
For example, when needs carry out the transformation of scale processing to the secondary sampled signal, but adoption rate converter unit 201.When needs carry out the proportional integral conversion to the secondary sampled signal, but adoption rate integral transformation unit 202.When needs carry out the proportion integration differentiation conversion to the secondary sampled signal, but adoption rate integral differential converter unit.This area can be selected according to actual needs.When needs carry out filtering to the secondary sampled signal, described filter unit 204 can be connected to the secondary of described transformer T1, be used for the described secondary sampled signal of filtering.When needs carry out clamp to the secondary sampled signal, clamp units 205 can be connected to the secondary of described transformer T1, be used for the described secondary sampled signal of clamp.
In other preferred embodiments of the present invention, described secondary signal processing module 200 comprises one and the described filter unit 204 in described transformation of scale unit 201, proportional integral converter unit 202, proportion integration differentiation converter unit.Such as, when described secondary signal processing module 200 comprises filter unit 204 and transformation of scale unit 201, described filter unit 204 is connected to the secondary of described transformer T1, be used for the described secondary sampled signal of filtering, secondary sampled signal after described transformation of scale unit 201 accepts filter from described filter unit 204, and filtered secondary sampled signal is carried out transformation of scale.
In other preferred embodiments of the present invention, described secondary signal processing module 200 comprises one and the described clamp units 205 in described transformation of scale unit 201, proportional integral converter unit 202, proportion integration differentiation converter unit.Such as, when described secondary signal processing module 200 comprises clamp units 205 and transformation of scale unit 201, described clamp units 205 is connected to the secondary of described transformer T1, be used for the described secondary sampled signal of clamp, described transformation of scale unit 201 receives secondary sampled signal after clamps from described clamp units 205, and the secondary sampled signal after described clamp is carried out transformation of scale.
In another kind of preferred embodiment of the present invention, described secondary signal processing module 200 can include only described clamp units 205 and filter unit 204, wherein said clamp units 205 is connected to the secondary of described transformer T1 with the described secondary sampled signal of clamper, described filter unit 204 is connected to described clamp units 205 receiving the secondary sampled signal after clamper, and the secondary sampled signal after described clamper is carried out filtering.
In preferred embodiment of the present invention, described secondary signal processing module 200 further comprises one, described filter unit 204 and the described clamp units 205 in described transformation of scale unit 201, proportional integral converter unit 202, proportion integration differentiation converter unit.
As shown in Figure 4, in one embodiment of the invention, described secondary signal processing module 200 can comprise transformation of scale unit 201, filter unit 204 and clamp units 205.In this embodiment, described clamp units 205 is connected to the secondary of described transformer T1, is used for the described secondary sampled signal of clamp Vsample.Then, the 204 couples of described secondary sampled signal of clamp Vsample carry out filtering by filter unit, generate clamp filtering secondary sampled signal Vsample ' '.Described transformation of scale unit 201 receives described clamp filtering secondary sampled signal Vsample ' ' it is carried out the ratio variation, the secondary sampled signal Vsample ' after processing with output.
In other embodiments of the invention, can adoption rate integral transformation unit 202(as shown in Figure 5) or proportion integration differentiation converter unit 203 come substitution ratio converter unit 201.
At this, those skilled in the art are known and can obtain aforementioned proportion converter unit 201, proportional integral converter unit 202, proportion integration differentiation converter unit, filter unit 204 and clamp units 205.Any above-mentioned functions module as known in the art may be used to the present invention, has stated with regard to no longer its structure being tired out at this.In addition, those skilled in the art can according to actual needs, select any known signal processing unit to carry out required processing so that it adapts to the needs of subordinate's circuit better to the secondary sampled signal.
In a preferred embodiment of the invention, described switching tube Q1 can be mos field effect transistor (MOSFET), it can be also insulated gate bipolar transistor (IGBT), can also be other device for power switching, its driving circuit can be isolated drive circuit or non-isolated drive circuit.Fig. 3 is the oscillogram of direct voltage isolated sampling device shown in Figure 2.Below in conjunction with Fig. 3, the principle of work of direct voltage isolated sampling device of the present invention is further detailed:
When driving circuit 101 driving switch pipe Q1 conducting, DC voltage Vdc is through transformer T1 isolation and voltage transformation, in the secondary output secondary sampled signal of transformer T1.Secondary signal processing module 200 receives described secondary sampled signal and as required it is processed, such as carrying out transformation of scale, proportional integral conversion or proportion integration differentiation conversion to it.In a preferred embodiment of the invention, also can carry out filtering to the secondary sampled signal after conversion, or introduce clamp units.After the processing through secondary signal processing module 200, can generate effective secondary sampled signal, for subordinate's electric circuit inspection and control.When driving circuit 101 driving switch pipe Q1 turn-offed, the secondary sampled signal of acquisition is invalid signal, and was inoperative to subordinate's circuit.That is, only when switching tube Q1 conducting, effective secondary sampled signal Vsample ' of generation just just works to subordinate's circuit, and switching tube is when turn-offing, acquisition will be invalid signal.Its circuit working waveform as shown in Figure 3, the Vdc signal is DC voltage, ton is during switching tube Q1 opens, toff is switching tube Q1 blocking interval.During ton, Vsample ' is effective secondary sampled signal, and Vdc is linear with DC voltage.During toff, Vsample ' is invalid signal, and its shape size need not to be concerned about, dots in figure.
Fig. 4 is the schematic block circuit diagram of the 3rd embodiment of direct voltage isolated sampling device of the present invention.As shown in Figure 4, can safe and reliable work for transformer T1, when switching tube Q1 turn-offs, need to carry out magnetic reset.Therefore, be provided with magnetic reset circuit 300 between the former limit first input end of transformer T1 and former limit the second input end.
Fig. 5 is the schematic block circuit diagram of the 4th embodiment of direct voltage isolated sampling device of the present invention.As shown in Figure 5, magnetic reset circuit 400 can be arranged between the source electrode and drain electrode of switching tube Q1, and then guarantee that transformer T1 can safe and reliable work.
In the present invention, can use any magnetic reset circuit well known in the prior art, those skilled in the art know and can obtain various magnetic reset circuit, state with regard to no longer tiring out at this.
Implement direct voltage isolated sampling device of the present invention, by transformer and switch module, d. c. voltage signal is become switching value and isolate transmission and sampling, need not to use optocoupler, thereby cost is lower and reliability is high.In addition, also use the magnetic reset circuit, guaranteed the work that transformer can be safe and reliable, and then guaranteed the stable and reliable of whole direct voltage isolated sampling device.
Although the present invention describes by specific embodiment, it will be appreciated by those skilled in the art that, without departing from the present invention, can also carry out various conversion and be equal to alternative the present invention.Therefore, the present invention is not limited to disclosed specific embodiment, and should comprise the whole embodiments that fall in claim scope of the present invention.
Claims (12)
1. a direct voltage isolated sampling device, is characterized in that, comprising: switch module (100) and transformer (T1); Wherein
Former limit the second input end that the former limit first input end of described transformer (T1) receives DC voltage (Vdc), described transformer (T1) is connected to the first end of described switch module (100), the second end ground connection of described switch module (100); When described switch module (100) conducting, the secondary of described transformer (T1) output secondary sampled signal;
Wherein said transformer (T1) and described switch module (100) are transformed into switching value to isolate transmission and sampling with described DC voltage (Vdc).
2. direct voltage isolated sampling device according to claim 1, it is characterized in that, described direct voltage isolated sampling device further comprises for the treatment of described secondary sampled signal to generate the secondary signal processing module (200) of effective secondary sampled signal; The first input end of described secondary signal processing module (200) is connected to secondary first output terminal of described transformer (T1), the second input end of described secondary signal processing module (200) is connected to secondary second output terminal of described transformer (T1) to receive described secondary sampled signal, the described effective secondary sampled signal of sampled signal output terminal output of described secondary signal processing module (200).
3. direct voltage isolated sampling device according to claim 1 and 2, is characterized in that, described switch module (100) comprises switching tube (Q1) and driving circuit (101); The grid of wherein said switching tube (Q1) is connected to described driving circuit (101) with reception driving signal and based on described driving signal conduction or shutoff, the source ground of described switching tube (Q1), drain electrode is connected to former limit second input end of described transformer (T1).
4. direct voltage isolated sampling device according to claim 3, is characterized in that, described switching tube (Q1) is mos field effect transistor or insulated gate bipolar transistor.
5. direct voltage isolated sampling device according to claim 3, is characterized in that, described driving circuit (101) is isolated drive circuit or non-isolated drive circuit.
6. direct voltage isolated sampling device according to claim 1 and 2, it is characterized in that, described direct voltage isolated sampling device further comprises the first magnetic reset circuit (300) that is used for the described transformer of magnetic reset (T1) between former limit second input end of the former limit first input end that is arranged on described transformer (T1) and described transformer (T1).
7. direct voltage isolated sampling device according to claim 1 and 2, it is characterized in that, described direct voltage isolated sampling device further comprises the second magnetic reset circuit (400) that is used for the described switch module of magnetic reset (100) between the second end of the first end that is arranged on described switch module (100) and described switch module (100).
8. direct voltage isolated sampling device according to claim 2, it is characterized in that, described secondary signal processing module (200) comprises transformation of scale unit (201) for the treatment of described secondary sampled signal, proportional integral converter unit (202), proportion integration differentiation converter unit, be used for the filter unit (204) of the described secondary sampled signal of filtering or be used for the clamp units (205) of the voltage of the described secondary sampled signal of clamper.
9. direct voltage isolated sampling device according to claim 2, it is characterized in that, described secondary signal processing module (200) comprises clamp units (205) and filter unit (204), wherein said clamp units (205) is connected to the secondary of described transformer (T1) with the described secondary sampled signal of clamper, described filter unit (204) is connected to described clamp units (205) receiving the secondary sampled signal after clamper, and the secondary sampled signal after described clamper is carried out filtering.
10. direct voltage isolated sampling device according to claim 9, it is characterized in that, described secondary signal processing module (200) further comprises the one in transformation of scale unit (201), proportional integral converter unit (202), proportion integration differentiation converter unit, and the one in described transformation of scale unit (201), proportional integral converter unit (202), proportion integration differentiation converter unit is connected to described filter unit (204) so that the secondary sampled signal after the filtering clamp is processed.
11. direct voltage isolated sampling device according to claim 2, it is characterized in that, described secondary signal processing module (200) comprises transformation of scale unit (201), proportional integral converter unit (202), one in the proportion integration differentiation converter unit and filter unit (204), wherein said filter unit (204) is connected to the secondary of described transformer (T1) with the described secondary sampled signal of filtering, described transformation of scale unit (201), proportional integral converter unit (202), one in the proportion integration differentiation converter unit is connected to described filter unit (204) so that filtered secondary sampled signal is processed.
12. direct voltage isolated sampling device according to claim 2, it is characterized in that, described secondary signal processing module (200) comprises transformation of scale unit (201), proportional integral converter unit (202), one in the proportion integration differentiation converter unit and clamp units (205), wherein said clamp units (205) is connected to the secondary of described transformer (T1) with the described secondary sampled signal of clamper, described transformation of scale unit (201), proportional integral converter unit (202), one in the proportion integration differentiation converter unit is connected to described clamp units (205) so that the secondary sampled signal after clamp is processed.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102565670A (en) * | 2011-12-12 | 2012-07-11 | 河南省电力公司洛阳供电公司 | On-line diagnosis device of relay protection device |
| CN102539871B (en) * | 2011-12-12 | 2014-06-18 | 河南省电力公司洛阳供电公司 | Replay protection switching value isolation sensing circuit |
| CN103063905A (en) * | 2012-12-14 | 2013-04-24 | 王奉瑾 | Single battery voltage isolation detecting system |
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Address after: No. 1510, Kansas Avenue, lureen, Ohio, USA Patentee after: Walteff energy systems company Address before: The United States of Ohio city F Lorain Street No. 1122 Patentee before: Emerson Network Power Co., Ltd. |
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Effective date of registration: 20211222 Address after: Ohio, USA Patentee after: Dimension Corp. Address before: No. 1510, Kansas Avenue, lureen, Ohio, USA Patentee before: VERTIV ENERGY SYSTEMS, Inc. |