CN109557356A - The current sampling circuit of isolated electrical energy transformer - Google Patents
The current sampling circuit of isolated electrical energy transformer Download PDFInfo
- Publication number
- CN109557356A CN109557356A CN201811374537.9A CN201811374537A CN109557356A CN 109557356 A CN109557356 A CN 109557356A CN 201811374537 A CN201811374537 A CN 201811374537A CN 109557356 A CN109557356 A CN 109557356A
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- side winding
- isolating transformer
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- primary side
- transformer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- General Physics & Mathematics (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses the current sampling circuits of isolated electrical energy transformer, an isolating transformer is included at least including isolated electrical energy transformer, the primary side winding of an isolating transformer primary circuit in parallel, the vice-side winding of an isolating transformer secondary circuit in parallel, the current sampling circuit includes coupling inductance, auxiliary winding and sampling capacitance, the primary side winding of the coupling inductance is series between the primary circuit and the primary side winding of the isolating transformer, the vice-side winding of the coupling inductance is in parallel with the sampling capacitance by a resistance, the secondary side of the auxiliary winding and the isolating transformer couples, the auxiliary winding is in parallel with the sampling capacitance by a resistance, the present invention samples the secondary current of isolated electrical energy transformer using coupling inductance and capacitor, reduce the loss of circuit, avoid resistance sampling The shortcomings that.
Description
Technical field
The present invention relates to isolated electrical energy transformer technical fields, and in particular to the pair of isolated electrical energy transformer
The sample circuit of side electric current.
Background technique
As Switching Power Supply rapidly develops, for industry to efficiency, power density has higher requirement, forms fixation
The brick power supply of size, such as quarter brick modular power source, 1/2 brick modular power source, full brick modular power source etc..In these power modules,
It usually needs to be monitored output electric current, to obtain the current working status of power supply in real time.Because of traditional current sample mode
It needs larger area to place sampling resistor or current transformer and has certain loss, and such power volume all very littles, with
The development of power technology, requirement of the user to power and power density be also continuously improved, especially in such as server, processor
Etc. occasions, it is desirable that it is more stringent.For some pairs of efficiency and the higher occasion of volume requirement, the side of current sample is needed to be improved
Formula improves the working efficiency of converter.
Summary of the invention
The present invention exactly thinks and in this, a kind of sample circuit for being not required to sampling resistor is realized, so as to resistance sampling
The adverse effect of generation improves circuit efficiency.
The current sampling circuit of isolated electrical energy transformer, including isolated electrical energy transformer, the isolated electric energy become
Parallel operation includes at least an isolating transformer, the primary side winding of an isolating transformer primary circuit in parallel, the isolation transformation
The vice-side winding of a device secondary circuit in parallel, the current sampling circuit includes coupling inductance, auxiliary winding and sampling capacitance, institute
The primary side winding for stating coupling inductance is series between the primary circuit and the primary side winding of the isolating transformer, the coupling
The vice-side winding of inductance is in parallel with the sampling capacitance by a first resistor, the auxiliary winding and the isolating transformer
Secondary side coupling, the auxiliary winding are in parallel with the sampling capacitance by a second resistance.
The vice-side winding of above-mentioned coupling inductance and the turn ratio of primary side windingThe inductance of the primary side winding of the coupling inductance
Measure the vice-side winding of L1 and the isolating transformer and the turn ratio of primary side windingThe magnetizing inductance amount of the isolating transformer
It is necessary to meet following condition by the resistance value r2 of L2, the resistance value r1 of the first resistor and the second resistance:
The voltage at above-mentioned sampling capacitance both ends and the proportional relationship of the output electric current of the vice-side winding of the isolating transformer.
Above-mentioned primary circuit includes input voltage, first switch, second switch, the first and second switches series connection group
At bridge arm, the anode of the input voltage connects the first switch, and the negative terminal connection described second of the input voltage is opened
It closes, the midpoint of the bridge arm connects one end of the coupling inductance primary side winding, the other end of the coupling inductance primary side winding
It is connected with one end of the isolating transformer primary side winding, the other end and first capacitor of the isolating transformer primary side winding
It is connected, the other end of the first capacitor and the negative terminal of input voltage connect, and the secondary circuit is full-wave rectifying circuit.
Beneficial effect eliminates the sampling resistor of large volume, avoids the loss of sampling resistor bring.
For allow invention features described above and advantage can be clearer and more comprehensible, special embodiment below, and cooperate institute's accompanying drawings make
Detailed description are as follows.
Detailed description of the invention
The schematic diagram of the current sampling circuit of the isolated electrical energy transformer of Fig. 1 present invention.
Fig. 2 is that current sampling circuit is applied to the circuit diagram in resonant mode isolated converter in Fig. 1.
Specific embodiment
To keep purpose and the technical solution of the embodiment of the present invention clearer, below in conjunction with the attached of the embodiment of the present invention
Figure, is clearly and completely described the technical solution of the embodiment of the present invention.Obviously, described embodiment is of the invention
A part of the embodiment, instead of all the embodiments.Based on described the embodiment of the present invention, those of ordinary skill in the art
Every other embodiment obtained, shall fall within the protection scope of the present invention under the premise of being not necessarily to creative work.
As shown in Figure 1, the isolated electrical energy transformer 10 of the present invention includes isolating transformer T2, the isolating transformer T2 packet
Primary side winding N3 and vice-side winding N5 are included, the primary side winding N3 of the isolating transformer T2 is connected in parallel primary circuit 11, described
The vice-side winding N5 of isolating transformer T2 is connected in parallel secondary circuit 12, current sampling circuit.The isolated transformation of electrical energy
Device 10 further includes current sampling circuit 13, the current sampling circuit 13 include auxiliary winding N4, the auxiliary winding N4 with every
It is coupled from transformer T2, Same Name of Ends is identical as the vice-side winding N5 of the isolating transformer T2, the auxiliary winding N4, series connection one
In parallel with the both ends of a sampling capacitance C1 after resistance R2, the current sampling circuit 13 further includes coupling described in a coupling inductance T1
Inductance includes primary side winding N1 and vice-side winding N2, the primary side winding of primary side winding the N1 series connection and the isolating transformer T2
Between N3 and primary circuit 11, the vice-side winding N2 is in parallel with the sampling capacitance C1 after connecting with a resistance R1.
T1 is coupling inductance, and the number of turns of primary side winding N1 is n1 circle, and the number of turns of vice-side winding N2 is n2 circle, primary side winding N1
Inductance be known as L1, T2 is transformer, and magnetizing inductance sensibility reciprocal is L2, and the number of turns of primary side winding N3 is n3, vice-side winding N4
The number of turns be n4, the impedance of first resistor R1 is r1, and the impedance of second resistance R2 is r2, meet following relationship between them:
The current value I4 that voltage vc value on the sampling capacitance C1 can be equivalent to vice-side winding N5 in real time compares multiplied by one
Example coefficient, so the voltage vc value on detection C1 can detect the current value I4 of vice-side winding N5.
Fig. 2 is applied to the circuit diagram in resonant mode isolated converter for current sampling circuit in Fig. 1, as shown,
The isolated electrical energy transformer of the present embodiment uses half-bridge LLC series resonant converter, but the present invention is not limited thereto.Its
In, input voltage vin is connected to the bridge arm being composed in series by switch S1, S2, and the anode of Vin connects switch S1, and the negative terminal of Vin connects
Lower switch S2, the midpoint of bridge arm connect one end of coupling inductance T1 primary side winding N1, the other end of coupling inductance T1 primary side winding N1
It is connected with one end of isolating transformer T2 primary side winding N3, the other end and the capacitor C2 phase of isolating transformer T2 primary side winding N3
Connection, the other end of C2 and the negative terminal of Vin connect.The secondary side of isolating transformer T2 is using with centre tapped full-wave rectification electricity
The both ends on road, isolating transformer T2 vice-side winding N5 are connect with one end of switch D1, D2 respectively, the other end phase of switch D1, D2
The negative terminal and ground of output capacitance Co are connected and are connected to, the centre cap of the vice-side winding N5 of T1 is connected to the anode of Co.But this
The secondary circuit of invention is not limited thereto, such as half-wave rectifying circuit, circuit of synchronous rectification etc. all can serve as secondary circuit.
In the present embodiment, the vice-side winding of coupling inductance T1 is in parallel with sampling capacitance C1 by resistance R1, and transformation is isolated
Device T2 further includes an auxiliary winding N4, and the both ends of auxiliary winding N4 are in parallel with sampling capacitance C1 by resistance R2.
As shown in Fig. 2, the turn ratio of coupling inductance T1With the turn ratio of primary side inductance L1 and isolating transformer T2It encourages
It is necessary to meet following condition by magnetoelectricity sensibility reciprocal L2:
Voltage vc value on C1 can be equivalent to the current value I4 of vice-side winding N5 multiplied by a proportionality coefficient, so inspection in real time
The voltage vc value surveyed on C1 can detect the current value I4 of vice-side winding N5.
Although the present invention has been disclosed by way of example above, it is not intended to limit the present invention., any technical field
Middle tool usually intellectual, without departing from the spirit and scope of the present invention, when can make some changes and embellishment, thus it is of the invention
Protection scope should be defined by the scope of the appended claims.
Claims (4)
1. the current sampling circuit of isolated electrical energy transformer, including isolated electrical energy transformer, the isolated transformation of electrical energy
Device includes at least an isolating transformer, the primary side winding of an isolating transformer primary circuit in parallel, the isolating transformer
The in parallel secondary circuit of vice-side winding, which is characterized in that the current sampling circuit includes coupling inductance, auxiliary winding and adopts
Sample capacitor, the primary side winding of the coupling inductance be series at the primary circuit and the isolating transformer primary side winding it
Between, the vice-side winding of the coupling inductance is in parallel with the sampling capacitance by a first resistor, the auxiliary winding with it is described
The secondary side of isolating transformer couples, and the auxiliary winding is in parallel with the sampling capacitance by a second resistance.
2. the current sampling circuit of isolated electrical energy transformer as described in claim 1, which is characterized in that the coupling inductance
The turn ratio of vice-side winding and primary side windingThe inductance L1 and the isolating transformer of the primary side winding of the coupling inductance
Vice-side winding and primary side winding the turn ratioThe resistance value of the magnetizing inductance amount L2 of the isolating transformer, the first resistor
It is necessary to meet following condition by r1 and the resistance value r2 of the second resistance:
3. the current sampling circuit of isolated electrical energy transformer as claimed in claim 2, which is characterized in that the sampling capacitance two
The voltage at end relationship proportional to the output electric current of the vice-side winding of the isolating transformer, samples the sampling capacitance both ends
Voltage can calculate the output electric current of the vice-side winding of the isolating transformer.
4. the current sampling circuit of isolated electrical energy transformer as claimed in claim 3, which is characterized in that the primary circuit packet
It includes, input voltage, first switch, second switch, the bridge arm that first and second switch is composed in series, the input voltage
Anode connects the first switch, and the negative terminal of the input voltage connects the second switch, and the midpoint of the bridge arm connects institute
State one end of coupling inductance primary side winding, the other end of the coupling inductance primary side winding and the isolating transformer primary side winding
One end be connected, the other end of the isolating transformer primary side winding is connected with first capacitor, the first capacitor it is another
The connection of the negative terminal of one end and input voltage, the secondary circuit are full-wave rectifying circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811374537.9A CN109557356B (en) | 2018-11-19 | 2018-11-19 | Current sampling circuit of isolated electric energy converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811374537.9A CN109557356B (en) | 2018-11-19 | 2018-11-19 | Current sampling circuit of isolated electric energy converter |
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| Publication Number | Publication Date |
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| CN109557356A true CN109557356A (en) | 2019-04-02 |
| CN109557356B CN109557356B (en) | 2021-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811374537.9A Active CN109557356B (en) | 2018-11-19 | 2018-11-19 | Current sampling circuit of isolated electric energy converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110045174A (en) * | 2019-05-24 | 2019-07-23 | 南京酷科电子科技有限公司 | A kind of current sampling circuit |
| CN117907877A (en) * | 2024-03-20 | 2024-04-19 | 江苏展芯半导体技术股份有限公司 | Current detection circuit of isolated converter |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590580A (en) * | 2012-01-10 | 2012-07-18 | 南京航空航天大学 | Circuit and method for sampling excitation inductance current of integrated transformer |
| CN103887984A (en) * | 2014-03-28 | 2014-06-25 | 矽力杰半导体技术(杭州)有限公司 | Isolating converter and switching power supply comprising same |
| US20150079901A1 (en) * | 2013-03-15 | 2015-03-19 | David Schie | Isolator |
| CN204347112U (en) * | 2015-01-15 | 2015-05-20 | 天津军星管业集团有限公司 | A kind of current detection circuit being applicable to the current transformer of digital power |
| CN105099203A (en) * | 2015-07-24 | 2015-11-25 | 矽力杰半导体技术(杭州)有限公司 | Voltage sampling control circuit, voltage sampling control method and isolated converter |
| CN105226916A (en) * | 2014-06-25 | 2016-01-06 | 台达电子企业管理（上海）有限公司 | The current sample method of isolated power converters and sampling apparatus |
| CN106771489A (en) * | 2016-12-22 | 2017-05-31 | 江苏由甲申田新能源科技有限公司 | Isolated form low-voltage, high-current DC DC converters method for detecting output current and device |
| CN206505117U (en) * | 2016-12-22 | 2017-09-19 | 江苏由甲申田新能源科技有限公司 | Isolated form low-voltage, high-current DC DC converter detecting device for output current |
-
2018
- 2018-11-19 CN CN201811374537.9A patent/CN109557356B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590580A (en) * | 2012-01-10 | 2012-07-18 | 南京航空航天大学 | Circuit and method for sampling excitation inductance current of integrated transformer |
| US20150079901A1 (en) * | 2013-03-15 | 2015-03-19 | David Schie | Isolator |
| CN103887984A (en) * | 2014-03-28 | 2014-06-25 | 矽力杰半导体技术(杭州)有限公司 | Isolating converter and switching power supply comprising same |
| CN105226916A (en) * | 2014-06-25 | 2016-01-06 | 台达电子企业管理（上海）有限公司 | The current sample method of isolated power converters and sampling apparatus |
| CN204347112U (en) * | 2015-01-15 | 2015-05-20 | 天津军星管业集团有限公司 | A kind of current detection circuit being applicable to the current transformer of digital power |
| CN105099203A (en) * | 2015-07-24 | 2015-11-25 | 矽力杰半导体技术(杭州)有限公司 | Voltage sampling control circuit, voltage sampling control method and isolated converter |
| CN106771489A (en) * | 2016-12-22 | 2017-05-31 | 江苏由甲申田新能源科技有限公司 | Isolated form low-voltage, high-current DC DC converters method for detecting output current and device |
| CN206505117U (en) * | 2016-12-22 | 2017-09-19 | 江苏由甲申田新能源科技有限公司 | Isolated form low-voltage, high-current DC DC converter detecting device for output current |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110045174A (en) * | 2019-05-24 | 2019-07-23 | 南京酷科电子科技有限公司 | A kind of current sampling circuit |
| CN117907877A (en) * | 2024-03-20 | 2024-04-19 | 江苏展芯半导体技术股份有限公司 | Current detection circuit of isolated converter |
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| CN109557356B (en) | 2021-06-11 |
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Effective date of registration: 20211130 Address after: 335003 No. 19, wanbaozhi Road, high tech Industrial Development Zone, Yingtan City, Jiangxi Province Patentee after: JIANGXI BOLANDE ENERGY TECHNOLOGY CO.,LTD. Address before: 210000 floor 12, building a, Baixia gaoxinyuan cloud computing innovation base, No. 6, Yongzhi Road, Qinhuai District, Nanjing, Jiangsu Patentee before: NANJING BOLANDE POWER TECHNOLOGY DEVELOPMENT Co.,Ltd. |