CN209120064U - A kind of control circuit and switching circuit of switching circuit - Google Patents
A kind of control circuit and switching circuit of switching circuit Download PDFInfo
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- CN209120064U CN209120064U CN201821551503.8U CN201821551503U CN209120064U CN 209120064 U CN209120064 U CN 209120064U CN 201821551503 U CN201821551503 U CN 201821551503U CN 209120064 U CN209120064 U CN 209120064U
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Abstract
The utility model discloses a kind of control circuit of switching circuit and switching circuits, switching circuit includes first switch tube and second switch, first switch tube and second switch series connection, first switch tube is connected to high voltage end, second switch is connected to low-voltage end, the common node of first switch tube and second switch is switching node, switching node is with reference to ground, detect high voltage end or low-voltage end voltage, obtain the signal of characterization second switch body diode conducting, according to the signal of characterization second switch body diode conducting, control the turn-on instant of first switch tube.
Description
Technical field
The utility model relates to power electronics fields, and in particular to a kind of control circuit and switch electricity of switching circuit
Road.
Background technique
In Switching Power Supply, it is related to the occasion of synchronously control, due to cannot be straight-through there is a phenomenon where switching tube, so needing
Dead time is set.Two switching tubes of synchronously control cannot simultaneously turn on, and otherwise just will appear the situation of short circuit.In order to make out
Pipe reliable operation is closed, avoids causing two switching tubes straight-through due to turn-off delay, it is necessary to dead time, that is, two be arranged
The time that switching tube simultaneously turns off.Dead time can be effectively prevented from a switching tube caused by turn-off delay and not close completely
It is disconnected, and another switching tube is in the conductive state.But dead time is too long to reduce power supply delivery efficiency.
The prior art is the control that down tube cut-off signals are transmitted to upper tube by level conversion (level-shift) circuit
Circuit, therefore the delay that the delay of level shifting circuit will cause upper tube to be connected, also, the dead time meeting of upper down tube conducting
Influenced by level shifting circuit, and this can change with the variation of temperature and input and output voltage, cause power-efficient with
The variation of temperature and input and output voltage and change.Therefore suitable Power MOSFET for Switching Power Supply efficiency and can
It is extremely important by property.
Utility model content
In view of this, being used the purpose of this utility model is to provide a kind of control circuit of switching circuit and switching circuit
It is influenced with solving dead time in the prior art by level shifting circuit, it is difficult to the problem of controlling, power-efficient can not be optimized.
The technical solution of the utility model is to provide a kind of switching circuit control method, and the switching circuit includes
First switch tube and second switch, the first switch tube and second switch series connection, the first switch tube connection
To high voltage end, the second switch is connected to low-voltage end, and the first switch tube is upper tube, and the second switch is
The common node of down tube, the first switch tube and the second switch is switching node, and the switching node is reference ground,
The high voltage end or the low-voltage end voltage are detected, the signal of characterization second switch body diode conducting is obtained, according to
The signal of the characterization second switch body diode conducting, controls the turn-on instant of the first switch tube.
As optional, the body diode conducting of second switch is detected, and upper tube Continuity signal is effective, control described first
Switching tube conducting.
As optional, second switch body diode is obtained according to the signal of characterization second switch body diode conducting and is led
The logical time, the turn-on instant of the first switch tube is adjusted according to the second switch body diode turn-on time.
As optional, the upper tube Continuity signal in down tube Continuity signal from before effectively becoming invalid, from becoming in vain
Effectively.
As optional, the second switch body diode turn-on time and target value are compared, when described second
Switching tube body diode turn-on time is less than target value, and the turn-on instant of the first switch tube is postponed, and opens when described second
The tube body diode current flow time is closed greater than target value, the turn-on instant of the first switch tube is shifted to an earlier date.
The another technical solution of the utility model is to provide a kind of control circuit of switching circuit, the switch electricity
Road includes first switch tube and second switch, and the first switch tube and the second switch are connected, the first switch
Pipe is connected to high voltage end, and the second switch is connected to low-voltage end, and the first switch tube is upper tube, and described second opens
The common node of Guan Guanwei down tube, the first switch tube and the second switch is switching node, high-end voltage and described
Switching node is respectively that the feeder ear of first switch tube drive circuit and reference ground, the control circuit detect the high voltage end
Or the low-voltage end voltage, the signal of characterization second switch body diode conducting is obtained, the control circuit is according to
The signal for characterizing the conducting of second switch body diode, controls the turn-on instant of the first switch tube.
As optional, including body diode conduction detection circuit and logic or adjustment circuit, the body diode conducting inspection
Slowdown monitoring circuit receives the high voltage end or the low-voltage end voltage, obtains the letter of characterization second switch body diode conducting
Number, the logic or adjustment circuit receive the signal that characterization second switch body diode is connected, and generate the first switch tube
Continuity signal.
As optional, the body diode conduction detection circuit is edge sense circuit, detects the body two of second switch
Edge is connected in pole pipe.
As optional, the edge sense circuit includes first resistor and first capacitor, the first resistor and described
The series connection of one capacitor, the first capacitor are connected to the high voltage end or the low-voltage end, and the first resistor is connected to institute
State switching node or high-end voltage, the common node of the first resistor and the first capacitor is characterization second switch tube body two
The signal of pole pipe conducting.
As optional, the logic or adjustment circuit are logic circuit, and the logic circuit is in detection second switch
Edge is connected in body diode, and when upper tube Continuity signal is effective, controls the first switch tube conducting.
As optional, the logic or adjustment circuit are adjustment circuit, and the adjustment circuit is according to characterization second switch
The signal of body diode conducting obtains second switch body diode turn-on time, is led according to the second switch body diode
The logical time adjusts the turn-on instant of the first switch tube.
As optional, control circuit further includes ON-OFF control circuit and level shifting circuit, and the ON-OFF control circuit produces
Raw first upper tube controls signal, and the first upper tube control signal passes through the level shifting circuit, generates upper tube Continuity signal,
The upper tube Continuity signal in the down tube Continuity signal from before effectively becoming invalid, from becoming effective in vain.
As optional, the adjustment circuit compares the second switch body diode turn-on time and target value
Compared with when the second switch body diode turn-on time is less than target value, the adjustment circuit is by the first switch tube
Turn-on instant delay, when the second switch body diode turn-on time is greater than target value, the adjustment circuit is by described the
The turn-on instant of one switching tube shifts to an earlier date.
As optional, the adjustment circuit obtains second by detecting the rising edge of the high voltage end or low-voltage end
At the time of the body diode of switching tube is begun to turn on；The adjustment circuit is by detecting under the high voltage end or low-voltage end
The rising edge for dropping edge or first switch tube grid, at the time of obtaining the body diode shutdown of second switch.
Another technical solution of the utility model is to provide a kind of switching circuit.
Using the circuit structure and method of the utility model, compared with prior art, upper tube control electricity is had the advantage that
Road obtains lower tube body diode current flow signal, to be precisely controlled upper tube by directly detecting high-end voltage or lower terminal voltage
Conducting.
Detailed description of the invention
The circuit diagram that Fig. 1 is the utility model switching circuit when being BUCK reduction voltage circuit；
Fig. 2 is waveform diagram of the utility model switching node SW relative to low-voltage end；
Fig. 3 is waveform diagram of the utility model low-voltage end relative to switching node SW；
Fig. 4 is the circuit diagram of the utility model；
Fig. 5 is the circuit diagram in one embodiment of the utility model；
Fig. 6 is the circuit diagram of the edge sense circuit 100 in one embodiment；
Fig. 7 is the circuit diagram of the logic circuit 200 in one embodiment；
Fig. 8 is the circuit diagram in another embodiment of the utility model；
Fig. 9 is the circuit diagram in the another embodiment of the utility model.
Specific embodiment
It is described in detail below in conjunction with preferred embodiment of the attached drawing to the utility model, but the utility model is not merely
It is limited to these embodiments.The utility model covers any substitution made in the spirit and scope of the utility model, modification, equivalent
Method and scheme.
In order to make the public have thorough understanding to the utility model, in following the preferred embodiment in the utility model specifically
Concrete details is illustrated, and that this can also be understood completely is practical new for description without these details for a person skilled in the art
Type.
The utility model is more specifically described by way of example referring to attached drawing in the following passage.It should be noted that attached drawing
It is all made of more simplified form and uses non-accurate ratio, only to facilitate, lucidly aid in illustrating the utility model
The purpose of embodiment.
The utility model provides a kind of control circuit of switching circuit, and switching circuit includes first switch tube M01 and second
Switching tube M02, the first switch tube M01 and the second switch M02 series connection, the first switch tube are connected to high voltage
End, the second switch are connected to low-voltage end, and the first switch tube is upper tube, and the second switch is down tube, institute
The common node of first switch tube and the second switch is stated as switching node SW, high-end voltage BST and switching node SW points
Not Wei first switch tube drive circuit feeder ear and with reference to ground, the control circuit detects the high voltage end or the low electricity
Pressure side voltage, obtains the signal of characterization second switch body diode conducting, and the control circuit is opened according to the characterization second
The signal for closing tube body diode current flow, controls the turn-on instant of the first switch tube.
It please refers to shown in Fig. 1, by taking BUCK reduction voltage circuit as an example, input terminal Vin is high voltage end, and the reference ground of input terminal is
Low-voltage end, switching node SW are connected to output end vo ut by inductance L01.The reference ground of upper tube drive circuit 300 is switch
Node SW, feeder ear are high-end voltage BST.It please refers to shown in Fig. 2, at 11 moment, PWML signal is lower by height, and PWMH signal is
Low, upper tube M01 shutdown, down tube M02 is not turned on also, since the electric current of inductance L01 is that continuously, the body diode of down tube M02 is continuous
Stream, the diode forward conduction voltage drop that SW is negative to the voltage of low-voltage end, for example, -0.7V or so.The control of first switch tube
Circuit reference ground be SW, low-voltage end relative to SW voltage as shown in figure 3, and electricity of the high voltage end relative to low-voltage end
Pressure is fixed voltage, and in BUCK circuit, which is input voltage.So control circuit can detecte high voltage end or
Low-voltage end voltage obtains the signal of characterization second switch body diode conducting.Control circuit is according to second switch tube body two
The signal of pole pipe conducting controls the conducting of upper tube, and at 12 moment, the output signal PWMH of control circuit is got higher by low, in process
Upper tube M01 is connected in tube drive circuit 300.Control circuit obtains down tube by directly detecting high-end voltage or lower terminal voltage
Body diode Continuity signal, to be precisely controlled upper tube conducting.In this embodiment, it is illustrated by taking BUCK circuit as an example, it should
Control mode is not limited to BUCK circuit, can be adapted for any switching circuit with upper down tube, such as four switch BUCK-BOOST
Circuit etc..
It please refers to shown in Fig. 4, in one embodiment, control circuit includes body diode conduction detection circuit 100 and patrols
It collects or adjustment circuit 200, body diode conduction detection circuit 100 receives the high voltage end or the low-voltage end voltage, obtain
To the signal A of characterization second switch body diode conducting, the logic or adjustment circuit 200 receive characterization second switch tube body
The signal of diode current flow generates the first switch tube Continuity signal PWMH.
It please refers to shown in Fig. 5, in one embodiment, the body diode conduction detection circuit is edge sense circuit,
Edge is connected in the body diode for detecting second switch.Refering to what is shown in Fig. 3, low-voltage end or high voltage end are opposite at 11 moment
Switching node SW has rising edge, therefore, passes through detection low-voltage end or the rising edge of high voltage end, so that it may obtain second switch
Edge is connected in the body diode of pipe.
It please refers to shown in Fig. 6, is one embodiment of edge sense circuit, edge sense circuit includes first resistor 101
With first capacitor 102, the first resistor 101 and the first capacitor 102 are connected, and the first capacitor 102 is connected to described
High voltage end or the low-voltage end, the first resistor are connected to the switching node SW or high-end voltage, first electricity
The common node of resistance and the first capacitor is the signal for characterizing the conducting of second switch body diode, that is, Edge check electricity
The output A on road.When low-voltage end or high voltage end have voltage jump with respect to SW or BST, then the voltage jump passes through 102 coupling of capacitor
A point is closed, therefore can detect the jump of voltage by detecting A point voltage.
It please refers to shown in Fig. 5, the logic or adjustment circuit are logic circuit, and the logic circuit is in detection second switch
Edge is connected in the body diode of pipe, and upper tube Continuity signal TON is effective, and first switch tube Continuity signal PWMH is effective, controls institute
State first switch tube M01 conducting.
Control circuit further includes ON-OFF control circuit and level shifting circuit, and the ON-OFF control circuit generates the first upper tube
Signal is controlled, the first upper tube control signal passes through the level shifting circuit, generates upper tube Continuity signal, the upper tube is led
Messenger in the down tube Continuity signal from before effectively becoming invalid, from becoming effective in vain.Wherein, ON-OFF control circuit
400 reference ground is low-voltage end, and feeder ear is power vd.
ON-OFF control circuit 400 generates down tube Continuity signal PWML and the first upper tube controls signal TON ', due to upper tube
The reference ground of driving circuit 300 is switching node SW, therefore the first upper tube control signal TON ' is needed by level shifting circuit
500 are converted into the upper tube Continuity signal TON relative to switching node SW.In the prior art, upper tube Continuity signal TON is straight
Connect by upper tube drive circuit drive upper tube M01, that is, down tube Continuity signal PWML and the first upper tube control signal TON ' it
Between have certain dead time, in the dead time, down tube Continuity signal PWML and the first upper tube control signal TON ' be all
In vain.And there is no dead time in the utility model, between down tube Continuity signal PWML and the first upper tube control signal TON ', the
One upper tube controls signal TON ' in down tube Continuity signal PWML by before effectively neutralizing, and from becoming in vain effectively, that is, has
Section the first upper tube of time control signal TON ' and down tube Continuity signal PWML is effective.When detecting high voltage end or low-voltage
There is rising edge at end relative to SW or BST, characterizes lower tube body diode current flow, the output first switch tube conducting of logic circuit 200
For signal PWMH from becoming in vain effectively, upper tube drive circuit 300 controls upper tube M01 conducting.Therefore, when dead zone between upper down tube
Between do not influenced by the delay of level shifting circuit 500.
Please refer to shown in Fig. 7, be logic circuit one embodiment, logic circuit be with door 201, with door 201 receive TON
And A, export first switch tube Continuity signal PWMH.
It please refers to shown in Fig. 8, logic or adjustment circuit are adjustment circuit, and the adjustment circuit is according to characterization second switch
The signal of body diode conducting obtains second switch body diode turn-on time, is led according to the second switch body diode
The logical time adjusts the turn-on instant of the first switch tube.
The second switch body diode turn-on time and target value are compared by adjustment circuit, are opened when described second
The tube body diode current flow time is closed less than target value, the adjustment circuit postpones the turn-on instant of the first switch tube, when
The second switch body diode turn-on time is greater than target value, when the adjustment circuit is by the conducting of the first switch tube
Quarter shifts to an earlier date.
With continued reference to shown in Fig. 8, adjustment circuit obtains the by detecting the rising edge of the high voltage end or low-voltage end
At the time of the body diode of two switching tubes is begun to turn on；The adjustment circuit is by detecting the high voltage end or low-voltage end
Failing edge, at the time of obtaining the body diode shutdown of second switch.Begun to turn on from the body diode of second switch when
The turn-on time of the as body diode of second switch at the time of being carved into the body diode shutdown of second switch.
Refering to what is shown in Fig. 9, adjustment circuit obtains the body of second switch by the rising edge of detection first switch tube grid
At the time of diode turns off.
The utility model also provides a kind of switching circuit control method, and switching circuit includes first switch tube M01 and second
Switching tube M02, the first switch tube M01 and the second switch M02 series connection, the first switch tube M01 are connected to height
Voltage end, the second switch M02 are connected to low-voltage end, and the first switch tube M01 is upper tube, the second switch
M02 is down tube, and the common node of the first switch tube M01 and the second switch M02 are switching node SW, the switch
Node SW is to detect the high voltage end or the low-voltage end voltage with reference to ground, obtains characterization second switch body diode
The signal of conducting controls the conducting of the first switch tube according to the signal of the characterization second switch body diode conducting
Moment.
In one embodiment, the high voltage end or the low-voltage end voltage are detected, characterization second switch is obtained
The signal of body diode conducting detects the body diode conducting of second switch, and upper tube Continuity signal TON is effective, controls institute
State first switch tube conducting.
In another embodiment, second switch tube body is obtained according to the signal of characterization second switch body diode conducting
The diode current flow time, when adjusting the conducting of the first switch tube according to the second switch body diode turn-on time
It carves.
The upper tube Continuity signal TON in down tube Continuity signal PWML from before effectively becoming invalid, from becoming having in vain
Effect.
The second switch body diode turn-on time and target value are compared, when the second switch tube body two
Pole pipe turn-on time is less than target value, the turn-on instant of the first switch tube is postponed, when two pole of second switch tube body
Pipe turn-on time is greater than target value, and the turn-on instant of the first switch tube is shifted to an earlier date.It is opened from the body diode of second switch
Begin conducting at the time of to second switch body diode shutdown at the time of as the conducting of the body diode of second switch when
Between.
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 (10)
1. a kind of control circuit of switching circuit, the switching circuit include first switch tube and second switch, feature exists
In: the first switch tube and second switch series connection, the first switch tube are connected to high voltage end, and described second opens
Close pipe and be connected to low-voltage end, the first switch tube is upper tube, and the second switch is down tube, the first switch tube and
The common node of the second switch is switching node, and high-end voltage and the switching node are respectively first switch tube driving
The feeder ear and reference ground, the control circuit of circuit detect the high voltage end or the low-voltage end voltage, are characterized
The signal of second switch body diode conducting, the control circuit are connected according to the characterization second switch body diode
Signal controls the turn-on instant of the first switch tube.
2. the control circuit of switching circuit according to claim 1, it is characterised in that: including body diode conduction detection electricity
Road and logic or adjustment circuit, the body diode conduction detection circuit receive the high voltage end or low-voltage end electricity
Pressure, obtains the signal of characterization second switch body diode conducting, and the logic or adjustment circuit receive characterization second switch
The signal of body diode conducting, generates the first switch tube Continuity signal.
3. the control circuit of switching circuit according to claim 2, it is characterised in that: the body diode conduction detection electricity
Road is edge sense circuit, detects the body diode conducting edge of second switch.
4. the control circuit of switching circuit according to claim 3, it is characterised in that: the edge sense circuit includes the
One resistance and first capacitor, the first resistor and first capacitor series connection, the first capacitor are connected to the high voltage
End or the low-voltage end, the first resistor are connected to the switching node or high-end voltage, the first resistor and described
The common node of first capacitor is the signal for characterizing the conducting of second switch body diode.
5. the control circuit of switching circuit according to claim 3, it is characterised in that: the logic or adjustment circuit are to patrol
Edge is connected in the body diode of volume circuit, the logic circuit detection second switch, and when upper tube Continuity signal is effective, control
The first switch tube conducting.
6. the control circuit of switching circuit according to claim 2, it is characterised in that: the logic or adjustment circuit are to adjust
Whole circuit, the adjustment circuit obtain second switch body diode according to the signal that characterization second switch body diode is connected
Turn-on time adjusts the turn-on instant of the first switch tube according to the second switch body diode turn-on time.
7. the control circuit of switching circuit according to claim 5 or 6, it is characterised in that: control circuit further includes switch
Control circuit and level shifting circuit, the ON-OFF control circuit generate the first upper tube and control signal, the first upper tube control
Signal passes through the level shifting circuit, generates upper tube Continuity signal, the upper tube Continuity signal is in down tube Continuity signal by having
Before effect becomes invalid, from becoming effective in vain.
8. the control circuit of switching circuit according to claim 6, it is characterised in that: the adjustment circuit is by described second
Switching tube body diode turn-on time and target value are compared, when the second switch body diode turn-on time is less than mesh
Scale value, the adjustment circuit postpone the turn-on instant of the first switch tube, when the second switch body diode is connected
Time is greater than target value, and the adjustment circuit shifts to an earlier date the turn-on instant of the first switch tube.
9. the control circuit of switching circuit according to claim 6, it is characterised in that: the adjustment circuit passes through detection institute
The rising edge for stating high voltage end or low-voltage end, at the time of obtaining the body diode of second switch and begin to turn on；The adjustment
Circuit obtains second by detecting the failing edge of the high voltage end or low-voltage end or the rising edge of first switch tube grid
At the time of the body diode shutdown of switching tube.
10. a kind of switching circuit, it is characterised in that: including control circuit as claimed in any one of claims 1 to 9 wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821551503.8U CN209120064U (en) | 2018-09-21 | 2018-09-21 | A kind of control circuit and switching circuit of switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821551503.8U CN209120064U (en) | 2018-09-21 | 2018-09-21 | A kind of control circuit and switching circuit of switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209120064U true CN209120064U (en) | 2019-07-16 |
Family
ID=67199306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821551503.8U Active CN209120064U (en) | 2018-09-21 | 2018-09-21 | A kind of control circuit and switching circuit of switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209120064U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109039075A (en) * | 2018-09-21 | 2018-12-18 | 杰华特微电子（杭州）有限公司 | A kind of control method of switching circuit, control circuit and switching circuit |
-
2018
- 2018-09-21 CN CN201821551503.8U patent/CN209120064U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109039075A (en) * | 2018-09-21 | 2018-12-18 | 杰华特微电子（杭州）有限公司 | A kind of control method of switching circuit, control circuit and switching circuit |
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Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Patentee after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Patentee before: JOULWATT TECHNOLOGY (HANGZHOU) Co.,Ltd. |