CN109302076A - Detection circuit and method, ON-OFF control circuit and inverse-excitation converting circuit - Google Patents
Detection circuit and method, ON-OFF control circuit and inverse-excitation converting circuit Download PDFInfo
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- CN109302076A CN109302076A CN201811305281.6A CN201811305281A CN109302076A CN 109302076 A CN109302076 A CN 109302076A CN 201811305281 A CN201811305281 A CN 201811305281A CN 109302076 A CN109302076 A CN 109302076A
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- 238000001514 detection method Methods 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title abstract description 8
- 238000004804 winding Methods 0.000 claims abstract description 31
- 238000012512 characterization method Methods 0.000 claims abstract description 10
- 230000010355 oscillation Effects 0.000 claims description 13
- 230000005611 electricity Effects 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000013519 translation Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- 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
- G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of detection circuit and methods, ON-OFF control circuit and inverse-excitation converting circuit, the detection circuit includes auxiliary winding, first resistor and clamp circuit, the auxiliary winding with it is transformer coupled in inverse-excitation converting circuit, the drain voltage of main switch in the voltage characterization inverse-excitation converting circuit of the auxiliary winding, after the first resistor and clamp circuit series connection and the auxiliary winding is in parallel, one end of the clamp circuit is grounded, the common end of the first resistor and clamp circuit is first node, main switch drain voltage in inverse-excitation converting circuit is determined according to the voltage of the first node minus time, output detection signal.The present invention improves detection accuracy.
Description
Technical field
The present invention relates to a kind of power electronics field, in particular to a kind of detection circuit and method, switch control electricity
Road and inverse-excitation converting circuit.
Background technique
As shown in Figure 1, inverse-excitation converting circuit is the power switch tube and freewheeling diode in buck-boost varying circuit
Between insertion be made of primary side winding and vice-side winding switch transformer to realize input and export electrical isolation a kind of DC-
DC translation circuit, inverse-excitation converting circuit is during power switch tube turns off to load transmission energy.It works in flyback varying circuit
In the process, primary side winding is as magnetizing inductance, and (including switch junction capacitance, transformer secondary are rolled over primary side equivalent tank capacitor
Radio appearance, transformer primary side coupled capacitor, absorbing circuit equivalent capacity) resonance occurs, lead to the switching tube of inverse-excitation converting circuit
Resonance also occurs for the end drain voltage Vdrain, and harmonic period is that resonance occurs for primary side winding and primary side equivalent tank capacitor
Harmonic period.In order to reduce the turn-on consumption of inverse-excitation converting circuit, it is expected that in the end switching tube drain voltage Vdrain resonance to paddy
The bottom moment opens power switch tube MI, and the lowest point moment of the end switching tube drain voltage Vdrain is difficult to determine.
In the prior art, after the end switching tube drain voltage Vdrain is equal to input voltage vin, the one section of value that is delayed is
The delay time of fixed value, using after delay time at the time of point as the lowest point moment of Vdrain, open switching tube M1 at this time, from
And reduce turn-on consumption.But the prior art, when circuit work frequency is higher, harmonic period changes greatly, using existing skill
There are biggish errors for the lowest point value and actual the lowest point value that art detects, therefore can not reach the mesh for reducing turn-on consumption
's.
Summary of the invention
The object of the present invention is to provide a kind of higher detection circuit of detection accuracy and method, ON-OFF control circuit and flybacks
Translation circuit solves the larger technical problem of the error of the existing technology when working frequency is higher.
To achieve the above object, the present invention provides a kind of detection circuits of inverse-excitation converting circuit, comprising: auxiliary winding,
First resistor and clamp circuit, the auxiliary winding and described transformer coupled, the voltage characterization flyback change of the auxiliary winding
Change the drain voltage of main switch in circuit, institute in parallel with the auxiliary winding after the first resistor and clamp circuit series connection
The one end for stating clamp circuit is grounded, and the common end of the first resistor and clamp circuit is first node, according to first node
At the time of the voltage minus time determines in inverse-excitation converting circuit main switch drain voltage resonance to the lowest point, the inspection of output the lowest point
Signal is surveyed, main switch drain voltage resonance is to the lowest point in the lowest point detection characterization inverse-excitation converting.
Optionally, after the voltage of first node is reduced to zero, postpone the half of first time, output the lowest point detection letter
Number；The first time is the voltage minus time of the first node in complete cycle of oscillation.
Optionally, the detection circuit further includes first time detection circuit and the lowest point detection module, the first time
Detection circuit receives the voltage of first node, exports first time signal, and the lowest point detection module receives the electricity of first node
Signal is detected in pressure and the first time signal, output the lowest point.
Optionally, the first time detection circuit is detected in complete cycle of oscillation and is saved at the first time, at it
Export first time signal to the lowest point detection module in his in period.
The present invention also provides a kind of detection methods of inverse-excitation converting circuit, are based on detection circuit, the detection circuit packet
Include auxiliary winding, first resistor and clamp circuit, the auxiliary winding and described transformer coupled, the voltage of the auxiliary winding
Characterize inverse-excitation converting circuit in main switch drain voltage, the first resistor and clamp circuit series connection after and it is described auxiliary around
Group is in parallel, one end ground connection of the clamp circuit, and the common end of the first resistor and clamp circuit is first node, according to the
At the time of the voltage of the one node minus time determines in inverse-excitation converting main switch drain voltage resonance to the lowest point, paddy is exported
Signal is detected at bottom, and main switch drain voltage resonance is to the lowest point in the lowest point detection characterization inverse-excitation converting.
Optionally, after the voltage of first node is reduced to zero, postpone the half of first time, output the lowest point detection letter
Number；The first time is the voltage minus time of the first node in complete cycle of oscillation.
The present invention also provides a kind of ON-OFF control circuits of inverse-excitation converting circuit, comprising: described in any of the above one
The input terminal of the detection circuit and switch control module of inverse-excitation converting circuit, the switch control module connects the detection circuit
Output end, receive the lowest point detect signal.
The present invention also provides a kind of inverse-excitation converting circuits, including above-described ON-OFF control circuit.
Compared with prior art, it is anti-to have the advantage that the present invention is sampled by auxiliary winding for the technical solution of the present invention
The drain terminal voltage of excitation converting circuit main switch is generated first node, the drain terminal voltage of main switch is made using clamp circuit
When less than input voltage, the drain terminal voltage of main switch is small less than zero, and in complete cycle of oscillation for the voltage of first node
It is equal to the first node voltage minus time in the time of input voltage, to prolong after the voltage of first node is reduced to zero
Signal is detected in the half of slow first time, output the lowest point, characterizes the drain terminal voltage resonance of main switch to the lowest point, and described the
One time was the voltage minus time of the first node in complete cycle of oscillation.The detection essence that the present invention detects the lowest point
Du Genggao improves the detection accuracy of the lowest point detection.
Detailed description of the invention
Fig. 1 is the circuit diagram of inverse-excitation converting circuit；
Fig. 2 is the schematic diagram of the detection circuit embodiment of inverse-excitation converting circuit of the present invention；
Fig. 3 is the working waveform figure of the detection circuit of inverse-excitation converting circuit of the present invention.
Specific embodiment
The preferred embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention is not restricted to these
Embodiment.The present invention covers any substitution made in the spirit and scope of the present invention, modification, equivalent method and scheme.
In order to make the public have thorough understanding to the present invention, it is described in detail in the following preferred embodiment of the present invention specific
Details, and the present invention can also be understood completely in description without these details for a person skilled in the art.
The present invention is more specifically described by way of example referring to attached drawing in the following passage.It should be noted that attached drawing is adopted
With more simplified form and using non-accurate ratio, only to facilitate, lucidly aid in illustrating the embodiment of the present invention
Purpose.
Fig. 2 is the schematic diagram of the detection circuit embodiment of inverse-excitation converting circuit of the present invention, and the inverse-excitation converting circuit includes
Main switch, transformer, secondary side rectifying tube and ON-OFF control circuit, the ON-OFF control circuit include switch control module and inspection
Slowdown monitoring circuit, the transformer include primary side winding and vice-side winding, and the main switch and the primary side winding are connected to input
The both ends of voltage, the pair side rectifying tube and the vice-side winding are connected to the both ends of output voltage, the switch control module
The control terminal of the main switch is connected, the output end of the detection circuit connects the switch control module.
The detection circuit includes auxiliary winding Lm, first resistor R1 and clamp circuit, in the present embodiment the clamper
Circuit is first diode D1, the auxiliary winding Lm and transformer coupled in inverse-excitation converting circuit, the auxiliary winding LM
Voltage Vm characterization inverse-excitation converting circuit in main switch M0 drain voltage Vdrain, the first resistor R1 and the one or two pole
After pipe D1 series connection and the auxiliary winding Lm is in parallel, the plus earth of the first diode D1, the first resistor R1 and the
The common end of one diode D1 is first node, when minus according to the voltage V1 of the voltage V1 of first node and first node
Between determine inverse-excitation converting circuit in main switch drain voltage Vdrain resonance arrive the lowest point at the time of, output the lowest point detection signal,
Main switch drain voltage Vdrain resonance is to the lowest point in the lowest point detection characterization inverse-excitation converting.
Fig. 3 gives the working waveform figure of the detection circuit of inverse-excitation converting circuit of the present invention.Wherein Vdrain is main switch
Pipe drain voltage, V1 are first node voltage, and T1 is the first node voltage minus time in complete cycle of oscillation.
From figure 3, it can be seen that main switch drain voltage Vdrain is less than the time of Vin in complete cycle of oscillation
Time T1 minus equal to first node voltage V1, and main switch drain voltage Vdrain drops to the time of the lowest point from Vin
Equal to the half of first time, i.e. 1/2T1.T1 is the harmonic period half of main switch drain voltage Vdrain,
In the case that device is fixed in circuit, the harmonic period of main switch drain voltage Vdrain is constant, therefore at the first time
It does not change in period below, specific: as long as detecting the once first time in complete cycle of oscillation, behind
The resonance the lowest point of main switch drain voltage Vdrain can be detected in other periods with the first time detected.
After the voltage of first node is reduced to zero, postpone the half of first time, signal is detected in output the lowest point；It is described
It is at the first time the voltage minus time of the first node in complete cycle of oscillation.
The detection circuit further includes first time detection circuit and the lowest point detection module, the first time detection circuit
The voltage of first node is received, exports first time signal, the lowest point detection module receives the voltage of first node and described
Signal is detected in first time signal, output the lowest point.The lowest point detection module exports the lowest point detection signal to switch control module,
The switch control module control main switch M0's turns on and off.
The first time detection circuit is detected in complete cycle of oscillation and is saved at the first time, in other periods
First time signal is exported to the lowest point detection module.
The input terminal of the switch control module connects the output end of the detection circuit, receives the lowest point and detects signal.
When overloaded or under normal circumstances, when switch control module receives the lowest point detection signal, main switch M0 is connected,
Turn-on consumption at this time is minimum.
And at light load, after switch control module receives the lowest point detection signal of first time, main switch will not be opened
M0 is received when signal is detected in the secondary the lowest point N (N > 1) and main switch M0 is connected.When being more lightly loaded, led in switching tube M0
When logical, main switch drain voltage no longer resonance in inverse-excitation converting.
In the embodiment having, the first time detection circuit is comparator, pulse along detection circuit and timing, described
The first input end of comparator connects first node voltage, and the second input terminal of comparator receives reference voltage, described with reference to electricity
Pressure is 0, and for comparator output pulse signal to pulse along detection circuit, the pulse detects the pulse signal along detection circuit
Reach rising edge, timing circuit starts timing, and when pulse signal reaches failing edge, timing circuit stops timing, and exports the
One time signal or the pulse detect that the pulse signal reaches failing edge along detection circuit, and timing circuit starts timing,
When pulse signal reaches rising edge, timing circuit stops timing, and exports first time signal.
The lowest point detection module receives the voltage and the first time signal of first node, when the voltage of first node
After being reduced to zero, postpone the half of first time, signal is detected in output the lowest point.
Although embodiment is separately illustrated and is illustrated above, it is related to the common technology in part, in ordinary skill
Personnel apparently, can be replaced and integrate between the embodiments, be related to one of embodiment and the content recorded is not known, then
It can refer to another embodiment on the books.
Embodiments described above does not constitute the restriction to the technical solution protection scope.It is any in above-mentioned implementation
Made modifications, equivalent substitutions and improvements etc., should be included in the protection model of the technical solution within the spirit and principle of mode
Within enclosing.
Claims (8)
1. a kind of detection circuit of inverse-excitation converting circuit, comprising: auxiliary winding, first resistor and clamp circuit, it is described auxiliary around
Group and transformer coupled in inverse-excitation converting circuit, main switch in the voltage characterization inverse-excitation converting circuit of the auxiliary winding
After drain voltage, the first resistor and clamp circuit series connection and the auxiliary winding is in parallel, a termination of the clamp circuit
The common end of ground, the first resistor and clamp circuit is first node, true according to the voltage of the first node minus time
At the time of determining in inverse-excitation converting circuit main switch drain voltage resonance to the lowest point, signal, the lowest point inspection are detected in output the lowest point
Main switch drain voltage resonance is surveyed in characterization inverse-excitation converting to the lowest point.
2. the detection circuit of inverse-excitation converting circuit according to claim 1, it is characterised in that: when the voltage drop of first node
After being zero, postpone the half of first time, signal is detected in output the lowest point；The first time is in complete cycle of oscillation
The voltage of the middle first node minus time.
3. the detection circuit of inverse-excitation converting circuit according to claim 2, it is characterised in that: the detection circuit further includes
First time detection circuit and the lowest point detection module, the first time detection circuit receive the voltage of first node, output the
One time signal, the lowest point detection module receive the voltage and the first time signal of first node, the detection of output the lowest point
Signal.
4. the detection circuit of inverse-excitation converting circuit according to claim 3, it is characterised in that: the first time detection electricity
Road is detected in complete cycle of oscillation and is saved at the first time, exports at the first time in other periods to the lowest point detection module
Signal.
5. a kind of detection method of inverse-excitation converting circuit, is based on detection circuit, the detection circuit includes auxiliary winding, the first electricity
Resistance and clamp circuit, the auxiliary winding and described transformer coupled, the voltage characterization inverse-excitation converting circuit of the auxiliary winding
After the drain voltage of middle main switch, the first resistor and clamp circuit series connection and the auxiliary winding is in parallel, the clamper
One end of circuit is grounded, and the common end of the first resistor and clamp circuit is first node, it is characterised in that: according to first segment
At the time of the voltage minus time of point determines in inverse-excitation converting main switch drain voltage resonance to the lowest point, output the lowest point is examined
Signal is surveyed, main switch drain voltage resonance is to the lowest point in the lowest point detection characterization inverse-excitation converting.
6. the detection method of inverse-excitation converting circuit according to claim 5, it is characterised in that: when the voltage drop of first node
After being zero, postpone the half of first time, signal is detected in output the lowest point；The first time is in complete cycle of oscillation
The voltage of the middle first node minus time.
7. a kind of ON-OFF control circuit of inverse-excitation converting circuit characterized by comprising described in claim 1-4 any one
Inverse-excitation converting circuit detection circuit and switch control module, it is electric that the input terminal of the switch control module connects the detection
The output end on road receives the lowest point and detects signal.
8. a kind of inverse-excitation converting circuit, it is characterised in that: including ON-OFF control circuit as claimed in claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811305281.6A CN109302076A (en) | 2018-11-02 | 2018-11-02 | Detection circuit and method, ON-OFF control circuit and inverse-excitation converting circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811305281.6A CN109302076A (en) | 2018-11-02 | 2018-11-02 | Detection circuit and method, ON-OFF control circuit and inverse-excitation converting circuit |
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| CN109302076A true CN109302076A (en) | 2019-02-01 |
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|---|---|---|---|
| CN201811305281.6A Pending CN109302076A (en) | 2018-11-02 | 2018-11-02 | Detection circuit and method, ON-OFF control circuit and inverse-excitation converting circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110794279A (en) * | 2019-11-15 | 2020-02-14 | 杰华特微电子（杭州）有限公司 | Clamp switch tube abnormity detection method, detection circuit and switch circuit |
| CN112838754A (en) * | 2020-12-30 | 2021-05-25 | 华源智信半导体(深圳)有限公司 | Clamping circuit, switching power supply circuit and control method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120299561A1 (en) * | 2011-05-24 | 2012-11-29 | Hangzhou Silergy Semiconductor Technology LTD | Quasi-resonant controlling and driving circuit and method for a flyback converter |
| CN103424602A (en) * | 2013-09-02 | 2013-12-04 | 南京埃科孚电子科技有限公司 | Secondary winding current detection circuit based on source electrode drive |
| CN204316306U (en) * | 2014-12-12 | 2015-05-06 | 中国电建集团中南勘测设计研究院有限公司 | A kind of grid clamping IGBT series average-voltage circuit |
| CN104702117A (en) * | 2014-12-26 | 2015-06-10 | 矽力杰半导体技术(杭州)有限公司 | Flyback conversion circuit, on-off control circuit adaptive to flyback conversion circuit and valley bottom detection circuit and method |
| CN209805678U (en) * | 2018-11-02 | 2019-12-17 | 杰华特微电子（杭州）有限公司 | Detection circuit, switch control circuit and flyback conversion circuit |
-
2018
- 2018-11-02 CN CN201811305281.6A patent/CN109302076A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120299561A1 (en) * | 2011-05-24 | 2012-11-29 | Hangzhou Silergy Semiconductor Technology LTD | Quasi-resonant controlling and driving circuit and method for a flyback converter |
| CN103424602A (en) * | 2013-09-02 | 2013-12-04 | 南京埃科孚电子科技有限公司 | Secondary winding current detection circuit based on source electrode drive |
| CN204316306U (en) * | 2014-12-12 | 2015-05-06 | 中国电建集团中南勘测设计研究院有限公司 | A kind of grid clamping IGBT series average-voltage circuit |
| CN104702117A (en) * | 2014-12-26 | 2015-06-10 | 矽力杰半导体技术(杭州)有限公司 | Flyback conversion circuit, on-off control circuit adaptive to flyback conversion circuit and valley bottom detection circuit and method |
| CN209805678U (en) * | 2018-11-02 | 2019-12-17 | 杰华特微电子（杭州）有限公司 | Detection circuit, switch control circuit and flyback conversion circuit |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110794279A (en) * | 2019-11-15 | 2020-02-14 | 杰华特微电子（杭州）有限公司 | Clamp switch tube abnormity detection method, detection circuit and switch circuit |
| CN112838754A (en) * | 2020-12-30 | 2021-05-25 | 华源智信半导体(深圳)有限公司 | Clamping circuit, switching power supply circuit and control method thereof |
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