CN201328102Y - Secondary-side control device of transformer - Google Patents
Secondary-side control device of transformer Download PDFInfo
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- CN201328102Y CN201328102Y CNU2008202127115U CN200820212711U CN201328102Y CN 201328102 Y CN201328102 Y CN 201328102Y CN U2008202127115 U CNU2008202127115 U CN U2008202127115U CN 200820212711 U CN200820212711 U CN 200820212711U CN 201328102 Y CN201328102 Y CN 201328102Y
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- transformer
- current
- control device
- voltage
- control chip
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Abstract
This utility model refers to a secondary-side control device of a transformer, comprising a control chip and a current transformer. The primary side of the current transformer is connected with the primary side of the transformer to sample primary-side current signals of the transformer, and the secondary side is connected with the control chip to provide the current sampling signals for the control chip; and the control chip further comprises a current limiting unit for controlling the on-off of a switch tube Q1 according to the current sampling signals.
Description
Technical field
The utility model relates to control device, more particularly, relates to a kind of transformer secondary control device.
Background technology
At present, to isolated transformer, at present the secondary control device that adopts carries out voltage-type or voltage, the control of electric current dicyclo by detecting secondary current often.These two kinds of methods all need secondary current is sampled, and the detection method of secondary current has two kinds at present:
The one, adopt sampling resistor sampling secondary current.This mode is fairly simple, and cost is low.If but secondary current is excessive, adopt the resistance detection current potential must cause big loss.
The 2nd, the voltage by sampling secondary copper sheet comes secondary is carried out current sample.This mode loss ratio sampling resistor is little.But because the resistance of copper sheet is little, so need high-precision amplifier amplifier to change this sample mode cost height.Because copper sheet resistance temperature influence is bigger, need temperature-compensating in addition, make complex circuit designs, and increase extra cost.
Therefore, need a kind of simplicity of design, loss is little and lower-cost transformer secondary control device.
The utility model content
The technical problems to be solved in the utility model is, the above-mentioned defective at the transformer secondary control device of prior art provides a kind of simplicity of design, loss is little and lower-cost transformer secondary control device.
The utility model realizes that the technical scheme that its purpose adopts is, construct a kind of transformer secondary control device, comprise control chip, comprise that also its former limit is connected on the primary current signal of the former limit of transformer with the described transformer of sampling, its secondary links to each other with control chip so that the current transformer of described current sampling signal to be provided to described control chip, and described control chip also comprises the current limliting unit according to described current sampling signal control switch pipe Q1.
In transformer secondary control device described in the utility model, described transformer secondary control device also comprises with described control chip and linking to each other so that the voltage error signal generation unit of voltage error signal to be provided to described control chip.
In transformer secondary control device described in the utility model, described control chip comprise according to described voltage error signal control described switching tube Q1 and be connected the rectifying tube Q2 of secondary of described transformer and Q3 to realize the Average Current Control unit of Average Current Control.
In transformer secondary control device described in the utility model, described voltage error signal generation unit comprises secondary voltage sample circuit and operational amplifier, sampled voltage, positive input that the reverse input end of described operational amplifier receives described secondary voltage sample circuit link to each other with reference voltage Vref, and output is connected to the Average Current Control unit of described control chip.
In transformer secondary control device described in the utility model, described transformer secondary control device also comprises the superpose voltage overlaying circuit of voltage signal of the voltage signal of described current transformer sample rate current and described sampling inductance L sample rate current of the sampling inductance L and being used to of the secondary of the output negative pole summation current transformer that is connected described transformer.
In transformer secondary control device described in the utility model, described control chip comprises rectifying tube Q2 and the peak current control unit of Q3 to realize that peak current is controlled of controlling described switching tube Q1 and the secondary that is connected described transformer according to the ratio of described superimposed voltage and voltage error signal.
In transformer secondary control device described in the utility model, described transformer secondary control device also comprises the secondary that is connected described current transformer and the rectification circuit between the described control chip.
In transformer secondary control device described in the utility model, described rectification circuit is half-wave rectifying circuit or full-wave rectifying circuit.
In transformer secondary control device described in the utility model, described transformer secondary control device also comprises the isolated drive circuit between the control end that is connected described control chip and switching tube Q1.
Implement transformer secondary control device of the present utility model, have following beneficial effect: owing to adopt current transformer, thereby simplicity of design, loss is little and cost is lower.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the theory diagram of the utility model transformer secondary control device;
Fig. 2 is the theory diagram of first embodiment of the utility model transformer secondary control device;
Fig. 3 is the theory diagram of second embodiment of the utility model transformer secondary control device;
Fig. 4 is the circuit theory diagrams of the 3rd embodiment of the utility model transformer secondary control device;
Fig. 5 is the circuit theory diagrams of the 4th embodiment of the utility model transformer secondary control device.
Embodiment
As shown in Figure 1, a kind of transformer secondary control device of the present utility model, comprise control chip 101, it comprises that also its former limit is connected the primary current signal of the former limit of transformer with the described transformer of sampling, its secondary links to each other with control chip 101 so that the current transformer 103 of described current sampling signal to be provided to described control chip 101, and described control chip 101 also comprises the current limliting unit 203 that turn-offs according to described current sampling signal control switch pipe Q1.In a preferred embodiment of the present utility model, described current limliting unit 203 also links to each other with the rectifying tube Q2, the Q3 that are set directly at described transformer secondary.When the current sampling signal that receives when described current limliting unit 203 is higher than set point, controls described switching tube Q1 and rectifying tube Q2 and Q3 and close, so as to carrying out overcurrent protection.
Fig. 2 is the theory diagram of first embodiment of the utility model transformer secondary control device.As shown in Figure 2, described control chip 101 comprises Average Current Control unit 201, current limliting unit 203 and peak current control unit 202.Described transformer secondary control device also comprises with described control chip 101 and linking to each other so that the voltage error signal generation unit 106 of voltage error signal to be provided to described control chip 101.Described Average Current Control unit 201 receive described voltage error signals and according to described voltage error signal control described switching tube Q1 and be connected the rectifying tube Q2 of secondary of described transformer and Q3 to realize Average Current Control.Described transformer secondary control device also comprises the superpose voltage overlaying circuit 107 of voltage signal of the voltage signal of described current transformer 103 sample rate currents and described sampling inductance L sample rate current of the sampling inductance L and being used on the former limit of the output negative pole summation current transformer 103 that is connected described transformer.Described peak current control unit 202 receives described superimposed voltage and voltage error signals, and according to their ratio control described switching tube Q1 and be connected the rectifying tube Q2 of secondary of described transformer and Q3 to realize peak current control.
Fig. 3 is the theory diagram of second embodiment of the utility model transformer secondary control device.As shown in Figure 3, described transformer secondary control device also comprises the secondary that is connected described current transformer 103 and the rectification circuit 104 between the described control chip 101, be used for former sampling edge electric current is carried out rectification, described rectification circuit 104 can be half-wave rectifying circuit or full-wave rectifying circuit.In an embodiment more of the present utility model, described rectification circuit 104 can also be a current rectifying and wave filtering circuit.In another embodiment of the present utility model, described transformer secondary control device also comprises the isolated drive circuit 105 between the control end that is connected described control chip 101 and switching tube Q1.
Fig. 4 is the circuit theory diagrams of the 3rd embodiment of the utility model transformer secondary control device.As shown in Figure 4, the former limit of current transformer CT is connected in series to the former limit of described transformer TR, the source electrode of switching tube Q1 links to each other with former limit negative pole, drain electrode links to each other with an end on the former limit of current transformer CT, grid is connected to control chip 101 through isolated drive circuit 105, the secondary of described current transformer CT connects rectification circuit 104, the former sampling edge signal of its sampling is sent into the current limliting unit 203 of control chip 101 after rectification circuit 104 rectifications, be used to control described switching tube Q1 and open and turn-off.In the present embodiment, current limiting tube Q2 and Q3 also are arranged on the secondary of described transformer TR, the drain electrode of described current limiting tube Q3 is connected to the secondary A end of described transformer, source electrode, grid that source electrode is connected to described current limiting tube Q2 are connected to described control chip 101, secondary B end, grid that transformer is linked in the drain electrode of described current limiting tube Q2 are connected to described control chip 101, and described control chip 101 can be used to control unlatching and the shutoff of described current limiting tube Q2 and Q3 simultaneously.Also be connected with secondary voltage sample circuit 601 and operational amplifier 602 between the source electrode of described current limiting tube Q3 and the drain electrode, sampled voltage, positive input that the reverse input end of described operational amplifier 602 receives described secondary voltage sample circuit 601 link to each other with reference voltage Vref, and output is connected to described control chip 101.Secondary voltage sampled signal and reference voltage Vref are relatively, proportional integral is delivered in the control chip 101 after amplifying, compare with the triangular wave in the control chip 101, the duty cycle signals of usefulness is controlled in output, drives the synchronous rectifier Q2 and the Q3 of former limit switching tube Q1 and secondary.
Fig. 5 is the circuit theory diagrams of the 4th embodiment of the utility model transformer secondary control device.In the present embodiment, a of inductance L end is connected the mid point of the output secondary of described transformer, and the b end is connected to the negative level Vout-of described output voltage, and the d end is connected to the anodal Vout+ of described output voltage, and the c end is connected to voltage overlaying circuit 107.The transformer output secondary current sampled signal that primary current sampled signal that described current transformer CT obtains and inductance L obtain is sent into control chip 101 after voltage overlaying circuit 107 converts the voltage superposed signal to.Control chip 101 compares voltage superposed signal and voltage error signal, when voltage error signal during greater than this voltage superposed signal, carries out peak current control.
In the present embodiment, described voltage overlaying circuit 107 comprises diode D1, D2, resistance R 1, R2 and capacitor C 1, the negative electrode of wherein said diode D1 and D2 interconnects, the anode of described diode D1 is connected to a end of inductance L, the anode of described diode D2 is connected to the secondary A end of described current transformer CT, described resistance R 2 is connected between the secondary B end of the negative electrode of described diode D1 and described current transformer CT, one end of described capacitor C 1 is connected to the secondary B end of described current transformer CT, and the other end is connected to the negative electrode of described diode D2 through resistance R 1.
Though the utility model describes by specific embodiment, it will be appreciated by those skilled in the art that, under the situation that does not break away from the utility model scope, can also carry out various conversion and be equal to alternative the utility model.Arbitrary circuit module in the utility model can be finished by other circuit module that can finish identical function or hardware-software module.Therefore, the utility model is not limited to disclosed specific embodiment, and should comprise the whole execution modes that fall in the utility model claim scope.
Claims (9)
1, a kind of transformer secondary control device, comprise control chip (101), it is characterized in that, comprise that also its former limit is connected on the primary current signal of the former limit of transformer with the described transformer of sampling, its secondary links to each other with control chip (101) so that the current transformer (103) of current sampling signal to be provided to described control chip (101), and described control chip (101) also comprises the current limliting unit (203) according to described current sampling signal control switch pipe Q1.
2, transformer secondary control device according to claim 1, it is characterized in that described transformer secondary control device also comprises with described control chip (101) and linking to each other so that the voltage error signal generation unit (106) of voltage error signal to be provided to described control chip (101).
3, transformer secondary control device according to claim 2, it is characterized in that, described control chip (101) comprise according to described voltage error signal control described switching tube Q1 and be arranged on the rectifying tube Q2 of secondary of described transformer and Q3 to realize the Average Current Control unit (201) of Average Current Control.
4, transformer secondary control device according to claim 3, it is characterized in that, described voltage error signal generation unit (106) comprises secondary voltage sample circuit (601) and operational amplifier (602), sampled voltage, positive input that the reverse input end of described operational amplifier (602) receives described secondary voltage sample circuit (601) link to each other with reference voltage Vref, and output is connected to the Average Current Control unit (201) of described control chip (101).
5, transformer secondary control device according to claim 4, it is characterized in that described transformer secondary control device also comprises the superpose voltage overlaying circuit (107) of voltage signal of the voltage signal of described current transformer (103) sample rate current and described sampling inductance L sample rate current of the sampling inductance L and being used to of secondary one end of the output negative pole summation current transformer (103) that is connected described transformer.
6, transformer secondary control device according to claim 5, it is characterized in that described control chip (101) comprises rectifying tube Q2 and the peak current control unit (202) of Q3 to realize that peak current is controlled of controlling described switching tube Q1 and the secondary that is connected described transformer according to the ratio of described superimposed voltage and voltage error signal.
7, according to the described transformer secondary of arbitrary claim control device among the claim 1-6, it is characterized in that described transformer secondary control device also comprises the secondary that is connected described current transformer (103) and the rectification circuit (104) between the described control chip (101).
8, transformer secondary control device according to claim 7 is characterized in that, described rectification circuit (104) is half-wave rectifying circuit or full-wave rectifying circuit.
9, transformer secondary control device according to claim 1 is characterized in that, described transformer secondary control device also comprises the isolated drive circuit (105) between the control end that is connected described control chip (101) and switching tube Q1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202127115U CN201328102Y (en) | 2008-10-21 | 2008-10-21 | Secondary-side control device of transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202127115U CN201328102Y (en) | 2008-10-21 | 2008-10-21 | Secondary-side control device of transformer |
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| Publication Number | Publication Date |
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| CN201328102Y true CN201328102Y (en) | 2009-10-14 |
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| CNU2008202127115U Expired - Lifetime CN201328102Y (en) | 2008-10-21 | 2008-10-21 | Secondary-side control device of transformer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219885A (en) * | 2012-01-20 | 2013-07-24 | 百富(澳门离岸商业服务)有限公司 | Direct current (DC) to DC converter |
| US9178433B2 (en) | 2013-05-15 | 2015-11-03 | Bel Fuse (Macao Commercial Offshore) Limited | Droop current sharing power converter with controlled transitions between regulation set points |
| CN106872067A (en) * | 2017-02-21 | 2017-06-20 | 焦海军 | A kind of temperature isolation Acquisition Circuit |
| TWI625017B (en) * | 2017-04-25 | 2018-05-21 | 群光電能科技股份有限公司 | protection circuit with Low power consumption |
-
2008
- 2008-10-21 CN CNU2008202127115U patent/CN201328102Y/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219885A (en) * | 2012-01-20 | 2013-07-24 | 百富(澳门离岸商业服务)有限公司 | Direct current (DC) to DC converter |
| CN103219885B (en) * | 2012-01-20 | 2015-08-12 | 百富(澳门离岸商业服务)有限公司 | DC to DC transducer |
| US9178433B2 (en) | 2013-05-15 | 2015-11-03 | Bel Fuse (Macao Commercial Offshore) Limited | Droop current sharing power converter with controlled transitions between regulation set points |
| CN106872067A (en) * | 2017-02-21 | 2017-06-20 | 焦海军 | A kind of temperature isolation Acquisition Circuit |
| CN106872067B (en) * | 2017-02-21 | 2023-10-17 | 焦海军 | Temperature isolation acquisition circuit |
| TWI625017B (en) * | 2017-04-25 | 2018-05-21 | 群光電能科技股份有限公司 | protection circuit with Low power consumption |
| US10581240B2 (en) | 2017-04-25 | 2020-03-03 | Chicony Power Technology Co., Ltd. | Protective circuit with low power consumption |
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Address after: Nanshan District Xueyuan Road in Shenzhen city of Guangdong province 518055 No. 1001 Nanshan Chi Park B2 building 1-4 floor, building 6-10 Patentee after: Vitamin Technology Co., Ltd. Address before: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee before: Aimosheng Network Energy Source Co., Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20091014 |