CN206389281U - Peak current detection circuit and power conversion unit - Google Patents
Peak current detection circuit and power conversion unit Download PDFInfo
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- CN206389281U CN206389281U CN201720031415.4U CN201720031415U CN206389281U CN 206389281 U CN206389281 U CN 206389281U CN 201720031415 U CN201720031415 U CN 201720031415U CN 206389281 U CN206389281 U CN 206389281U
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Abstract
A kind of peak current detection circuit is disclosed, for power conversion unit, including：First switch, peak value electric capacity and second switch are connected in series between the node between the first power switch pipe and the second power switch pipe and earth terminal；3rd switch is connected between peak value electric capacity and output capacitance；The voltage signal at peak value electric capacity two ends is peak voltage signal；Comparator includes first input end and the second input and output end, wherein, first input end is used to receive reference voltage, the second input and peak value capacitance connection, and output end is used to export peak current detection signal.The utility model also provides a kind of power conversion unit; the crest voltage at inductance two ends is obtained with shut-off by peak value electric capacity and the first to the 3rd conducting switched; and by the crest voltage with reference voltage by being compared generation current detection signal; and then conducting and shut-off that control circuit controls the second power switch pipe are fed back to, the second power switch pipe is played a protective role.
Description
Technical field
The utility model belongs to technical field of integrated circuits, more particularly, to a kind of peak current detection circuit and work(
Rate converting means.
Background technology
It is well known that all electronic equipments are required for power supply, but the requirement of different electronic system to power supply is different, is
The optimum performance of the respective electronic system of performance, then need to select suitable power management chip to provide optimal power management
Mode.And high-performance power supply managing chip is the important component of high-efficiency power converter.High-performance power supply managing chip
With Voltage Feedback control loop and Current Feedback Control loop.Current Feedback Control be accomplished by current detector detection inductance or
The electric current of switching tube, then feeds back to control module, to produce accurate control signal.
Fig. 1 shows the main frame figure of current power conversion unit (DC-DC converter, i.e. DC-DC converter).
As shown in figure 1, power conversion unit includes two the power switch pipe N1 and N2 for allowing to flow through high current, inductance L and output are electric
Hold Cout constitute, wherein, PWM (Plus Width Modulation, pulse width modulation) signal control power switch pipe N1 and
N2 conducting and shut-off.It is exactly the charging process to inductance L when the first power switch pipe N1 is turned on；When the second power switch pipe
N2 is exactly to inductance L discharge processes when turning on.And the working condition of converter system processing boosting, decompression or buck, it is main
To depend on input voltage vin and output voltage VoutRelation.Input voltage vin and output voltage VoutMagnitude of pressure differential determine
The time length of two power switch pipe N1, N2 conductings.
Fig. 2 is the current signal ripple on the clock signal waveform and inductance of power switch pipe in current power conversion unit
The schematic diagram of shape.As shown in Fig. 2 set inductive current (inductor current) flows to GND as forward current from node sw,
Inductive current flows to sw for negative current from node GND.When the first power switch pipe N1 is turned on, the second power switch pipe N2 breaks
Open, the value increase of inductive current；When the second power switch pipe N2 is turned on, the first power switch pipe N1 disconnects, inductive current
Value reduces.When inductive current persistently reduces, ultimate current direction changes, by from output voltage VoutEnd flows to sw and is changed into from section
Point sw flows to output voltage VoutEnd, voltage difference (Vsw-Vout) become big, cause the pressure between the second power switch pipe N2 source-drain electrode
Difference becomes big.When electric current is excessive, it may result in the second power switch pipe N2 and burn out.
Utility model content
The purpose of this utility model is to provide a kind of peak current detection circuit and power conversion unit.
According to one side of the present utility model, there is provided a kind of peak current detection circuit, the peak current detection circuit
For power conversion unit, the power conversion unit at least includes Input voltage terminal, output voltage terminal, the first power switch
Pipe, the second power switch pipe, inductance and output capacitance, first power switch pipe and the second power switch pipe are connected in series
Between Input voltage terminal and output voltage terminal, the inductance connection is between the first power switch pipe and the second power switch pipe
Node and earth terminal between, the output capacitance is connected between output voltage terminal and earth terminal, the peak current detection
Circuit includes：
First switch, peak value electric capacity and second switch, are connected in series in the first power switch pipe and the second power switch
Between node and earth terminal between pipe；
3rd switch, is connected between the peak value electric capacity and the output capacitance；
The voltage signal at the peak value electric capacity two ends is peak voltage signal；
Comparator, including first input end and the second input and output end, wherein, first input end, which is used to receive, joins
Voltage, the second input and the peak value capacitance connection are examined, output end is used to export peak current detection signal；
In the first state, the first power switch pipe is turned on, the shut-off of the second power switch pipe；
In the second condition, the second power switch pipe is turned on, the shut-off of the first power switch pipe.
Preferably, in the first state, first switch is turned off, second switch and the 3rd switch conduction；
In the second condition, first switch is turned on, second switch and the 3rd switch OFF.
Preferably, the peak current detection circuit also includes：
Reference voltage generating circuit, for generating reference voltage by the mirror image circuit of the second power switch pipe.
Preferably, the reference voltage generating circuit includes mirror image pipe, reference current source, the 4th switch, the 5th switch, the
One electric capacity and the second electric capacity,
4th switch and the 5th switch are connected in series in the grid of node and mirror image pipe between inductance and earth terminal
Between；
The grid of node and second power switch pipe of first capacitance connection between the 4th switch and the 5th switch
Between；
Second capacitance connection is between the grid and earth terminal of the mirror image pipe；
The source electrode of mirror image pipe is connected with earth terminal；
The drain electrode of mirror image pipe is connected with reference current source, and output reference voltage.
Preferably, in the first state, the 4th switch OFF, the 5th switch conduction, in the second condition, the 5th switch are closed
It is disconnected, the 4th switch conduction, first state replaces with the second state so that reference voltage generating circuit turns into the second power switch pipe
Mirror image circuit.
Preferably, the reference current source is connected between the drain electrode of Input voltage terminal and the mirror image pipe.
According to another aspect of the present utility model, there is provided a kind of power conversion unit, including power conversion modules, peak value electricity
Current detection circuit and control circuit,
Wherein, the power conversion modules include Input voltage terminal, output voltage terminal, the first power switch pipe, the second work(
Rate switching tube, inductance and output capacitance, first power switch pipe and the second power switch pipe are connected in series in input electricity
Between pressure side and output voltage terminal, node of the inductance connection between the first power switch pipe and the second power switch pipe with
Between earth terminal, the output capacitance is connected between output voltage terminal and earth terminal；
The peak current detection circuit includes：
First switch, peak value electric capacity and second switch, are connected in series in the first power switch pipe and the second power switch
Between node and earth terminal between pipe；
3rd switch, is connected between the peak value electric capacity and the output capacitance；
The voltage signal at the peak value electric capacity two ends is peak voltage signal；
Comparator, including first input end and the second input and output end, wherein, first input end, which is used to receive, joins
Voltage, the second input and the peak value capacitance connection are examined, output end is used to export peak current detection signal；
The control circuit is used to control the second power according to the peak current detection signal generation switch controlling signal
The conducting and shut-off of switching tube.
Preferably, the peak current detection circuit also includes：
Reference voltage generating circuit, for generating reference voltage by the mirror image circuit of the second power switch pipe.
Preferably, the reference voltage generating circuit includes mirror image pipe, reference current source, the 4th switch, the 5th switch, the
One electric capacity and the second electric capacity,
4th switch and the 5th switch are connected in series in the grid of node and mirror image pipe between inductance and earth terminal
Between；
The grid of node and second power switch pipe of first capacitance connection between the 4th switch and the 5th switch
Between；
Second capacitance connection is between the grid and earth terminal of the mirror image pipe；
The source electrode of mirror image pipe is connected with earth terminal；
The drain electrode of mirror image pipe is connected with reference current source, and output reference voltage.
Preferably, in the first state, the first power switch pipe is turned on, and the second power switch pipe shut-off, first switch is closed
It is disconnected, second switch and the 3rd switch conduction, the 4th switch OFF, the 5th switch conduction；
In the second condition, the second power switch pipe is turned on, the shut-off of the first power switch pipe, first switch conducting, second
Switch and the 3rd switch OFF, the 5th switch OFF, the 4th switch conduction.
The utility model embodiment provide peak current detection circuit and power conversion unit, by peak value electric capacity with
And first to the 3rd conducting and the shut-off of switch obtain the crest voltage at inductance two ends, and by the crest voltage and reference voltage
By comparing generation current detection signal, and then feed back to conducting and shut-off that control circuit controls the second power switch pipe.This
Utility model can control the size of negative peak electric current by changing reference voltage, and the second power switch pipe is risen by current limliting
To protective effect.The reference voltage can also be produced by the mirror image circuit of the second power switch pipe, by controlling reference current
Source and current mirror multiple control the size of reference voltage.
Brief description of the drawings
By description referring to the drawings to the utility model embodiment, of the present utility model above-mentioned and other mesh
, feature and advantage will be apparent from, in the accompanying drawings：
Fig. 1 shows the circuit diagram of the power conversion unit according to prior art；
Fig. 2 shows the switching sequence of power conversion unit and the oscillogram of inductive current；
Fig. 3 shows the circuit diagram of the power conversion unit provided according to the utility model embodiment；
Fig. 4 shows the circuit diagram of the power conversion unit provided according to another embodiment of the utility model；
Fig. 5 shows the switching sequence and inductive current of the power conversion unit provided according to the utility model embodiment
Oscillogram.
Embodiment
Various embodiments of the present utility model are more fully described hereinafter with reference to accompanying drawing.In various figures, identical
Element is represented using same or similar reference.For the sake of clarity, the various pieces in accompanying drawing are not drawn to paint
System.
The utility model can be presented in a variety of manners, some of examples explained below.
Fig. 3 shows the circuit diagram of the power conversion unit provided according to the utility model embodiment.As shown in figure 3, institute
Stating power conversion unit includes power conversion modules 10, peak current detection circuit 20 and control circuit 30.
Wherein, the power conversion modules 10 include Input voltage terminal Vin, output voltage terminal Vout, the first power switch pipe
N1, the second power switch pipe N2, inductance L and output capacitance Cout, the first power switch pipe N1 and the second power switch
Pipe N2 is connected in series in Input voltage terminal Vin and output voltage terminal VoutBetween, the inductance L is connected to the first power switch pipe
Between node sw and earth terminal GND between N1 and the second power switch pipe N2, the output capacitance Cout is connected to output electricity
Pressure side VoutBetween earth terminal GND.
In the present embodiment, output voltage terminal VoutNegative voltage is exported always.As shown in figure 5, in the first power switch pipe
When N1 is turned on, the voltage V at node swswIt is more than output voltage terminal V alwaysoutThe voltage at place；When the second power switch pipe N2 conductings
When, the voltage V at node swswWith VoutDifference (Vsw-Vout) linear growth.
The peak current detection circuit 20 includes first switch S1, second switch S2, the 3rd switch S3, peak value electric capacity C0
And comparator A1.Wherein, first switch S1, peak value electric capacity C0 and second switch S2 are connected in series in the first power switch pipe
Between N1 and the second power switch pipe N2 node sw and earth terminal GND；3rd switch S3, be connected to the peak value electric capacity C0 and
Between the output capacitance Cout；The voltage signal at the peak value electric capacity C0 two ends is peak voltage signal.Comparator A1, including
First input end and the second input and output end, wherein, first input end is used to receive reference voltage Vref, the second input
End is connected with the peak value electric capacity C0, and output end is used to export peak current detection signal ilimit.Wherein, the first of comparator A1
Input is inverting input, and the second input is normal phase input end.
In the first state, the first power switch pipe N1 is turned on, and the second power switch pipe N2 shut-offs, first switch S1 is closed
It is disconnected, the switch S3 conductings of second switch S2 and the 3rd；In the second condition, the second power switch pipe N2 is turned on, the first power switch
Pipe N1 is turned off, first switch S1 conductings, the switch S3 shut-offs of second switch S2 and the 3rd.
Peak value electric capacity C0 the first pole plate is connected with the switches of first switch S1 or the 3rd S3, the second pole plate and second switch S2
Connection.In the first state, first switch S1 shut-offs, the 3rd switch S3 conductings, peak value electric capacity C0 the first polar plate voltage are equal to
The voltage V of output voltage terminalout, second switch S2 conductings, peak value electric capacity C0 the second polar plate voltage is equal to GND.In the second state
Under, first switch S1 conductings, the 3rd switch S3 shut-offs, peak value electric capacity C0 the first polar plate voltage is equal to the voltage at node sw
Vsw.Second switch S2 is turned off, and the second power switch pipe N2 is low resistance state, and node sw voltage variety is defeated by peak value electric capacity C0
Enter the peak voltage signal V that the second input to comparator, the i.e. voltage of the second input are inductance two endsL, wherein, VL=
Vsw-Vout=iL·Rdson2, wherein, Rdson2For the second power switch pipe N2 impedance.Work as VL＞ VrefWhen, comparator A1 is defeated
Go out peak value current detection signal ilimit, logic state is changed into 1 from 0.
The control circuit 30 is used for according to the peak current detection signal ilimitGenerate switch controlling signal control the
Two power switch pipe N2 conducting and shut-off.
In the present embodiment, as the peak current detection signal ilimitLogic state be 0 when, control circuit 30 generate
Switch controlling signal control the second power switch pipe N2 conducting；As the peak current detection signal ilimitLogic state be
When 1, the switch controlling signal that control circuit 30 is generated controls the second power switch pipe N2 shut-offs.
The utility model embodiment provide peak current detection circuit and power conversion unit, by peak value electric capacity with
And first to the 3rd conducting and the shut-off of switch obtain the crest voltage at inductance two ends, and by the crest voltage and reference voltage
By comparing generation current detection signal, and then feed back to conducting and shut-off that control circuit controls the second power switch pipe.This
Utility model can control the size of negative peak electric current by changing reference voltage, and the second power switch pipe is risen by current limliting
To protective effect.
Fig. 4 shows the circuit diagram of the power conversion unit provided according to another embodiment of the utility model.Such as Fig. 4 institutes
Show, the power conversion unit includes power conversion modules 10, peak current detection circuit 20, control circuit 30 and reference
Voltage generation circuit 40.
Wherein, the power conversion modules 10 include Input voltage terminal Vin, output voltage terminal Vout, the first power switch pipe
N1, the second power switch pipe N2, inductance L and output capacitance Cout, the first power switch pipe N1 and the second power switch
Pipe N2 is connected in series in Input voltage terminal Vin and output voltage terminal VoutBetween, the inductance L is connected to the first power switch pipe
Between node sw and earth terminal GND between N1 and the second power switch pipe N2, the output capacitance Cout is connected to output electricity
Pressure side VoutBetween earth terminal GND.
In the present embodiment, output voltage terminal VoutNegative voltage is exported always.As shown in figure 5, in the first power switch pipe
When N1 is turned on, the voltage V at node swswIt is more than output voltage terminal V alwaysoutThe voltage at place；When the second power switch pipe N2 conductings
When, the voltage V at node swswWith VoutDifference (Vsw-Vout) linear growth.
The peak current detection circuit 20 includes first switch S1, second switch S2, the 3rd switch S3, peak value electric capacity C0
And comparator A1.Wherein, first switch S1, peak value electric capacity C0 and second switch S2 are connected in series in the first power switch pipe
Between N1 and the second power switch pipe N2 node sw and earth terminal GND；3rd switch S3, be connected to the peak value electric capacity C0 and
Between the output capacitance Cout；The voltage signal at the peak value electric capacity C0 two ends is peak voltage signal.Comparator A1, including
First input end and the second input and output end, wherein, first input end is used to receive reference voltage Vref, the second input
End is connected with the peak value electric capacity C0, and output end is used to export peak current detection signal.Wherein, comparator A1 the first input
Hold as inverting input, the second input is normal phase input end.
In the first state, the first power switch pipe N1 is turned on, and the second power switch pipe N2 shut-offs, first switch S1 is closed
It is disconnected, the switch S3 conductings of second switch S2 and the 3rd；In the second condition, the second power switch pipe N2 is turned on, the first power switch
Pipe N1 is turned off, first switch S1 conductings, the switch S3 shut-offs of second switch S2 and the 3rd.
Peak value electric capacity C0 the first pole plate is connected with the switches of first switch S1 or the 3rd S3, the second pole plate and second switch S2
Connection.In the first state, first switch S1 shut-offs, the 3rd switch S3 conductings, peak value electric capacity C0 the first polar plate voltage are equal to
The voltage V of output voltage terminalout, second switch S2 conductings, peak value electric capacity C0 the second polar plate voltage is equal to GND.In the second state
Under, first switch S1 conductings, the 3rd switch S3 shut-offs, peak value electric capacity C0 the first polar plate voltage is equal to the voltage at node sw
Vsw.Second switch S2 is turned off, and the second power switch pipe N2 is low resistance state, and node sw voltage variety is defeated by peak value electric capacity C0
Enter the peak voltage signal V that the second input to comparator, the i.e. voltage of the second input are inductance two endsL, wherein, VL=
Vsw-Vout=iL·Rdson2, wherein, Rdson2For the second power switch pipe N2 impedance.Work as VL＞ VrefWhen, comparator A1 is defeated
Go out peak value current detection signal ilimit, logic state is changed into 1 from 0.
The control circuit 30 is used for according to the peak current detection signal ilimitGenerate switch controlling signal control the
Two power switch pipe N2 conducting and shut-off.
In the present embodiment, as the peak current detection signal ilimitLogic state be 0 when, control circuit 30 generate
Switch controlling signal control the second power switch pipe N2 conducting；As the logic state i of the peak current detection signallimitFor
When 1, the switch controlling signal that control circuit 30 is generated controls the second power switch pipe N2 shut-offs.
Reference voltage generating circuit 40 is used to generate reference voltage V by the second power switch pipe N2 mirror image circuitref。
In the present embodiment, the reference voltage generating circuit 40 includes mirror image pipe N3, reference current source Iref, the 4th open
S4, the 5th switch S5, the first electric capacity C1 and the second electric capacity C2 are closed, wherein, the 4th switch S4 and the 5th switch S5 series connection connect
Between the node sm and mirror image pipe N3 grid that are connected between inductance L and earth terminal GND；First electric capacity C1 is connected to the 4th switch
S4 and the 5th is switched between the grid of the node sn and the second power switch pipe N2 between S5；Second electric capacity C2 is connected to institute
Between the grid and earth terminal GND of stating mirror image pipe N3；Mirror image pipe N3 source electrode is connected with earth terminal GND；Mirror image pipe N3 drain electrode
With reference current source IrefConnection, and output reference voltage Vref。
In the first state, the 4th switch S4 shut-offs, the 5th switch S5 conductings, in the second condition, the 4th switch S4 is led
It is logical, the 5th switch S5 shut-offs, first state replaces with the second state so that reference voltage generating circuit 40 is opened as the second power
Close pipe N2 mirror image circuit.
First electric capacity C1 the first pole plate is connected with the second power switch pipe N2 grid, second substrate and the 4th switch S4
With the 5th switch S5 node sn connections；Second electric capacity C2 the first pole plate is connected with mirror image pipe N3 grid, the second pole plate with
Earth terminal GND connections.
In the first state, the first electric capacity C1 the first polar plate voltage is equal to the voltage V of output voltage terminalout, the 4th switch
S4 is turned off, and the 5th switch S5 conductings, the first electric capacity C1 the second polar plate voltage is equal to earth terminal GND.In the second condition, the 4th
S4 conductings are switched, the 5th switch S5 shut-offs, the first electric capacity C1 the first polar plate voltage is equal to Vout+Vgs2(wherein, Vgs2For second
The voltage difference of power switch pipe N2 grid source electrode), the first electric capacity C1 the second pole plate and the second electric capacity C2 the first pole plate short circuit,
Transfer charge on the second electric capacity C2.After alternating several cycles by first state and the second state, mirror image pipe N3 grid source
The voltage difference of the voltage difference of pole and the second power switch pipe N2 grid source electrode is equal, i.e. Vgs2=Vgs3, then reference voltage generation
Circuit 40 turns into the second power switch pipe N2 mirror image circuit.Wherein, Vref=KRdson2·Iref, wherein, K is the second work(
Rate switching tube N2 and mirror image pipe N3 current mirror multiple.
In a preferred embodiment, the reference current source IrefIt is connected to Input voltage terminal Vin and the mirror image pipe
Between N3 drain electrode.
The power conversion unit that the utility model embodiment is provided, passes through leading that peak value electric capacity and first to the 3rd are switched
It is logical to obtain the crest voltage at inductance two ends with shut-off, and by the crest voltage with reference voltage by being compared generation current detecting
Signal, and then conducting and shut-off that control circuit controls the second power switch pipe are fed back to, wherein, reference voltage is by the second power
Switching tube N2 mirror image circuit is produced.The utility model can control to bear by changing reference current source and current mirror multiple
To the size of peak point current, the second power switch pipe is played a protective role by current limliting.
According to embodiment of the present utility model as described above, these embodiments do not have all details of detailed descriptionthe,
Also it is only described specific embodiment not limit the utility model.Obviously, as described above, many modifications and change can be made
Change.This specification is chosen and specifically describes these embodiments, be in order to preferably explain principle of the present utility model and it is actual should
With so that skilled artisan can repairing using the utility model and on the basis of the utility model well
Change and use.The scope that protection domain of the present utility model should be defined by the utility model claim is defined.
Claims (10)
1. a kind of peak current detection circuit, the peak current detection circuit is used for power conversion unit, the power conversion
Device at least includes Input voltage terminal, output voltage terminal, the first power switch pipe, the second power switch pipe, inductance and output
Electric capacity, first power switch pipe and the second power switch pipe are connected in series between Input voltage terminal and output voltage terminal,
Between node and earth terminal of the inductance connection between the first power switch pipe and the second power switch pipe, the output electricity
Appearance is connected between output voltage terminal and earth terminal, and the peak current detection circuit includes：
First switch, peak value electric capacity and second switch, be connected in series in the first power switch pipe and the second power switch pipe it
Between node and earth terminal between；
3rd switch, is connected between the peak value electric capacity and the output capacitance；
The voltage signal at the peak value electric capacity two ends is peak voltage signal；
Comparator, including first input end and the second input and output end, wherein, first input end is used to receive with reference to electricity
Pressure, the second input and the peak value capacitance connection, output end are used to export peak current detection signal；
Wherein, in the first state, the first power switch pipe is turned on, the shut-off of the second power switch pipe；In the second condition, second
Power switch pipe is turned on, the shut-off of the first power switch pipe.
2. peak current detection circuit according to claim 1, wherein, in the first state, first switch shut-off, second
Switch and the 3rd switch conduction；
In the second condition, first switch is turned on, second switch and the 3rd switch OFF.
3. peak current detection circuit according to claim 1, wherein, in addition to：
Reference voltage generating circuit, for generating reference voltage by the mirror image circuit of the second power switch pipe.
4. peak current detection circuit according to claim 3, wherein, the reference voltage generating circuit includes mirror image
Pipe, reference current source, the 4th switch, the 5th switch, the first electric capacity and the second electric capacity,
4th switch and the 5th switch are connected in series between the grid of the node between inductance and earth terminal and mirror image pipe；
Between the grid of node and second power switch pipe of first capacitance connection between the 4th switch and the 5th switch；
Second capacitance connection is between the grid and earth terminal of the mirror image pipe；
The source electrode of mirror image pipe is connected with earth terminal；
The drain electrode of mirror image pipe is connected with reference current source, and output reference voltage.
5. peak current detection circuit according to claim 4, wherein, in the first state, the 4th switch OFF, the 5th
Switch conduction, in the second condition, the 5th switch OFF, the 4th switch conduction, first state replace with the second state so that joining
Examining voltage generation circuit turns into the mirror image circuit of the second power switch pipe.
6. the peak current detection circuit according to claim 4 or 5, wherein, the reference current source is connected to input electricity
Between the drain electrode of pressure side and the mirror image pipe.
7. a kind of power conversion unit, including power conversion modules, peak current detection circuit and control circuit,
Wherein, the power conversion modules are opened including Input voltage terminal, output voltage terminal, the first power switch pipe, the second power
Guan Guan, inductance and output capacitance, first power switch pipe and the second power switch pipe are connected in series in Input voltage terminal
Between output voltage terminal, node and ground connection of the inductance connection between the first power switch pipe and the second power switch pipe
Between end, the output capacitance is connected between output voltage terminal and earth terminal；
The peak current detection circuit includes：
First switch, peak value electric capacity and second switch, be connected in series in the first power switch pipe and the second power switch pipe it
Between node and earth terminal between；
3rd switch, is connected between the peak value electric capacity and the output capacitance；
The voltage signal at the peak value electric capacity two ends is peak voltage signal；
Comparator, including first input end and the second input and output end, wherein, first input end is used to receive with reference to electricity
Pressure, the second input and the peak value capacitance connection, output end are used to export peak current detection signal；
The control circuit is used to control the second power switch according to the peak current detection signal generation switch controlling signal
The conducting and shut-off of pipe.
8. power conversion unit according to claim 7, wherein, the peak current detection circuit also includes：
Reference voltage generating circuit, for generating reference voltage by the mirror image circuit of the second power switch pipe.
9. power conversion unit according to claim 8, wherein, the reference voltage generating circuit includes mirror image pipe, ginseng
Current source, the 4th switch, the 5th switch, the first electric capacity and the second electric capacity are examined,
4th switch and the 5th switch are connected in series between the grid of the node between inductance and earth terminal and mirror image pipe；
Between the grid of node and second power switch pipe of first capacitance connection between the 4th switch and the 5th switch；
Second capacitance connection is between the grid and earth terminal of the mirror image pipe；
The source electrode of mirror image pipe is connected with earth terminal；
The drain electrode of mirror image pipe is connected with reference current source, and output reference voltage.
10. power conversion unit according to claim 9, wherein,
In the first state, the first power switch pipe is turned on, the shut-off of the second power switch pipe, first switch shut-off, second switch
With the 3rd switch conduction, the 4th switch OFF, the 5th switch conduction；
In the second condition, the second power switch pipe is turned on, the shut-off of the first power switch pipe, first switch conducting, second switch
With the 3rd switch OFF, the 5th switch OFF, the 4th switch conduction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720031415.4U CN206389281U (en) | 2017-01-11 | 2017-01-11 | Peak current detection circuit and power conversion unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720031415.4U CN206389281U (en) | 2017-01-11 | 2017-01-11 | Peak current detection circuit and power conversion unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206389281U true CN206389281U (en) | 2017-08-08 |
Family
ID=59492701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720031415.4U Withdrawn - After Issue CN206389281U (en) | 2017-01-11 | 2017-01-11 | Peak current detection circuit and power conversion unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206389281U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106712513A (en) * | 2017-01-11 | 2017-05-24 | 北京集创北方科技股份有限公司 | Peak value current detection circuit and power converter |
-
2017
- 2017-01-11 CN CN201720031415.4U patent/CN206389281U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106712513A (en) * | 2017-01-11 | 2017-05-24 | 北京集创北方科技股份有限公司 | Peak value current detection circuit and power converter |
| CN106712513B (en) * | 2017-01-11 | 2023-10-13 | 北京集创北方科技股份有限公司 | Peak current detection circuit and power conversion device |
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