CN109039076A - Control method, control circuit and the switching circuit of switching circuit - Google Patents
Control method, control circuit and the switching circuit of switching circuit Download PDFInfo
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- CN109039076A CN109039076A CN201811108311.4A CN201811108311A CN109039076A CN 109039076 A CN109039076 A CN 109039076A CN 201811108311 A CN201811108311 A CN 201811108311A CN 109039076 A CN109039076 A CN 109039076A
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- body diode
- conducting
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000012512 characterization method Methods 0.000 claims abstract description 36
- 238000001514 detection method Methods 0.000 claims description 25
- 230000000630 rising effect Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 10
- 230000005611 electricity Effects 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 8
- 239000003990 capacitor Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 241000208340 Araliaceae Species 0.000 description 2
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 2
- 235000003140 Panax quinquefolius Nutrition 0.000 description 2
- 235000008434 ginseng Nutrition 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
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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
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/38—Means for preventing simultaneous conduction of switches
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/38—Means for preventing simultaneous conduction of switches
- H02M1/385—Means for preventing simultaneous conduction of switches with means for correcting output voltage deviations introduced by the dead time
Abstract
The invention discloses a kind of control methods of switching circuit, control circuit and switching circuit, the switching circuit includes first switch tube and second switch, the first switch tube and second switch series connection, the first switch tube is connected to high voltage end, the second switch is connected to low-voltage end, the first switch tube is upper tube, the second switch is down tube, the common node of the first switch tube and the second switch is switching node, the low-voltage end is with reference to ground, detect the node voltage, or, the switching node is with reference to ground, detect the high voltage end voltage, obtain the signal of characterization first switch tube body diode conducting, according to the signal of the characterization first switch tube body diode conducting, control the turn-on instant of the second switch.
Description
Technical field
The present invention relates to power electronics fields, and in particular to a kind of control method of switching circuit, control circuit and
Switching circuit.
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.Therefore suitable dead
The control of area's time is extremely important for the efficiency and reliability of Switching Power Supply.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of control method of switching circuit, control circuit and switch electricity
Road can not optimize power-efficient to solve the problem of that dead time is difficult to optimize in the prior art.
The technical solution of the invention is as follows, provides a kind of switching circuit control method, and the switching circuit includes first
Switching tube and second switch, the first switch tube and second switch series connection, the first switch tube are connected to height
Voltage end, the second switch are connected to low-voltage end, and the first switch tube is upper tube, under the second switch is
The common node of pipe, the first switch tube and the second switch is switching node, and the switching node is with reference to ground, inspection
The high voltage end voltage is surveyed, the signal of characterization first switch tube body diode conducting is obtained, according to the characterization first switch
The signal of tube body diode current flow controls the turn-on instant of the first switch tube.
As optional, when lower than the node voltage first threshold of detection high voltage end voltage, then first switch tube is characterized
Body diode conducting.
As optional, the body diode conducting of first switch tube is detected, and upper tube Continuity signal is effective, control described first
Switching tube conducting.
As optional, first switch tube body diode is obtained according to the signal of characterization first switch tube body diode conducting and is led
The logical time, the turn-on instant of the first switch tube is adjusted according to the first switch tube 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 first switch tube body diode turn-on time and target value are compared, when described first
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 first
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.
Another technical solution of the invention 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 low-voltage end is reference ground,
The node voltage is detected, alternatively, the switching node is to detect the high voltage end voltage with reference to ground, characterized
The signal of first switch tube body diode conducting controls institute according to the signal of the characterization first switch tube body diode conducting
State the turn-on instant of second switch.
As optional, when the switching node is to detect high voltage end voltage lower than node voltage first with reference to ground
When threshold value, then the body diode conducting of first switch tube is characterized；When the low-voltage end is to detect the switching node with reference to ground
Voltage has rising edge, then characterizes the body diode conducting of first switch tube.
As optional, the body diode conducting of first switch tube is detected, and down tube Continuity signal is effective, control described second
Switching tube conducting.
As optional, first switch tube body diode is obtained according to the signal of characterization first switch tube body diode conducting and is led
The logical time, the turn-on instant of the second switch is adjusted according to the first switch tube body diode turn-on time.
As optional, the down tube Continuity signal in upper tube Continuity signal from before effectively becoming invalid, from becoming in vain
Effectively.
Another technical solution of the invention is to provide a kind of control circuit of switching circuit, the switching circuit packet
First switch tube and second switch are included, the first switch tube and second switch series connection, the first switch tube connect
It is connected to high voltage end, the second switch is connected to low-voltage end, and the first switch tube is upper tube, the second switch
For down tube, the common node of the first switch tube and the second switch is switching node, high-end voltage and the switch
Node is respectively the feeder ear and reference ground of first switch tube drive circuit, and the control circuit detects the high voltage end electricity
Pressure obtains the signal of characterization first switch tube body diode conducting, and the control circuit is according to the characterization first switch tube body
The signal of diode current flow controls the turn-on instant of the first switch tube.
As optional, including the first body diode conduction detection circuit and the first logic or adjustment circuit, first body
Diode current flow detection circuit receives the high voltage end voltage, obtains the signal of characterization first switch tube body diode conducting,
First logic or adjustment circuit receive the signal of characterization first switch tube body diode conducting, generate the first switch tube
Continuity signal.
As optional, the first body diode conduction detection circuit is voltage comparator circuit, detects high voltage end voltage
When first threshold lower than node voltage, the body diode conducting of first switch tube is characterized.
As optional, first logic or adjustment circuit are the first logic circuit, the first logic circuit detection the
The body diode of one switching tube is connected, and when upper tube Continuity signal is effective, controls the first switch tube conducting.
As optional, first logic or adjustment circuit are the first adjustment circuit, and the first adjustment circuit is according to table
The signal of sign first switch tube body diode conducting obtains first switch tube body diode turn-on time, according to the first switch
The tube body diode current flow time adjusts the turn-on instant of the first switch tube.
As optional, control circuit further includes ON-OFF control circuit and the first level shifting circuit, the switch control electricity
Road generates the first upper tube and controls signal, and the first upper tube control signal passes through first 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 first adjustment circuit carries out the first switch tube body diode turn-on time and target value
Compare, when the first switch tube body diode turn-on time is less than target value, the first adjustment circuit is opened described first
The turn-on instant delay for closing pipe, when the first switch tube body diode turn-on time is greater than target value, the first adjustment electricity
Road shifts to an earlier date the turn-on instant of the first switch tube.
Another technical solution of the invention is to provide a kind of control circuit of switching circuit, the switching circuit packet
First switch tube and second switch are included, the first switch tube and second switch series connection, the first switch tube connect
It is connected to high voltage end, the second switch is connected to low-voltage end, and the first switch tube is upper tube, the second switch
For down tube, the common node of the first switch tube and the second switch is switching node, and the low-voltage end is reference
Ground, the control circuit detect the node voltage, alternatively, the switching node is with reference to ground, the control circuit inspection
The high voltage end voltage is surveyed, obtains the signal of characterization first switch tube body diode conducting, the control circuit is according to
The signal for characterizing the conducting of first switch tube body diode, controls the turn-on instant of the second switch.
As optional, including the second body diode conduction detection circuit and the second logic or adjustment circuit, second body
Diode current flow detection circuit receives the node voltage or the high voltage end voltage, obtains characterization first switch tube body
The signal of diode current flow, second logic or adjustment circuit receive the signal of characterization first switch tube body diode conducting,
Generate the second switch Continuity signal.
As optional, the second body diode conduction detection circuit is voltage comparator circuit, and the switching node is ginseng
It examines ground, when detection lower than the node voltage first threshold of high voltage end voltage, characterizes the body diode conducting of first switch tube.
As optional, further include second electrical level conversion circuit, receive the output voltage of the voltage comparator circuit, will characterize
The reference level of the body diode Continuity signal of first switch tube is converted into the low-voltage end from the switching node, and described
Two logics or adjustment circuit receive the output voltage of the second electrical level conversion circuit.
As optional, the body diode conduction detection circuit is edge sense circuit, the low-voltage end be with reference to ground,
The rising edge for detecting the switching node characterizes the body diode conducting of second switch.
As optional, second logic or adjustment circuit are the second logic circuit, the second logic circuit detection the
The body diode of one switching tube is connected, and when down tube Continuity signal is effective, controls the second switch conducting.
As optional, second logic or adjustment circuit are second adjustment circuit, and the second adjustment circuit is according to table
The signal of sign first switch tube body diode conducting obtains first switch tube body diode turn-on time, according to the first switch
The tube body diode current flow time adjusts the turn-on instant of the second switch.
Another technical solution of the invention is to provide a kind of switching circuit.
Using circuit structure and method of the invention, compared with prior art, have the advantage that when can optimize dead zone
Between, to optimize the system effectiveness of Switching Power Supply.
Detailed description of the invention
Fig. 1 is the circuit diagram of control circuit of the present invention；
Fig. 2 is switching circuit of the present invention when being BOOST booster circuit, the circuit diagram of control circuit；
Fig. 3 is that the first upper tube of the invention controls signal TON ', first switch tube Continuity signal PWMH, down tube Continuity signal
The waveform diagram of BON and switching node SW；
Fig. 4 is the circuit diagram of the logic circuit 200 in one embodiment；
Fig. 5 is the circuit diagram in another embodiment of the present invention；
Fig. 6 is the circuit diagram in another embodiment of the invention；
Fig. 7 is the circuit diagram in another embodiment of the invention；
Fig. 8 be down tube Continuity signal BON of the present invention, upper tube Continuity signal TON, second switch Continuity signal PWML and
The waveform diagram of switching node SW；
The circuit diagram for the edge sense circuit 400 that Fig. 9 is；
Figure 10 is the circuit diagram in another embodiment 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.
The present invention provides a kind of control circuit of switching circuit, refering to what is shown in Fig. 1, the switching circuit includes first switch
Pipe M01 and second switch M02, the first switch tube M01 and the second switch M02 series connection, the first switch tube
M01 is connected to high voltage end, and the second switch M02 is connected to low-voltage end, and the first switch tube M01 is upper tube, institute
Second switch M02 is stated as down tube, the common node of the first switch tube M01 and the second switch M02 are joint
Point SW, high-end voltage and the switching node SW are respectively the feeder ear and reference ground of first switch tube drive circuit, the control
Circuit processed detects the high voltage end voltage, obtains the signal of characterization first switch tube body diode conducting, the control circuit
According to the signal of the characterization first switch tube body diode conducting, the turn-on instant of the first switch tube is controlled.
Refering to what is shown in Fig. 2, input terminal Vin is connected to switching node by inductance L01, defeated by taking BOOST booster circuit as an example
Outlet Vout is high voltage end, and the reference ground of output end vo ut is low-voltage end, and 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. 3, at 21 moment, down tube conducting BON signal is lower by height, the
One switching tube Continuity signal PWMH be it is low, down tube M02 shutdown, upper tube M01 is not turned on also, since the electric current of inductance L01 is continuous
, the body diode afterflow of upper tube M01, at 22 moment, switching node SW is diode forward conducting to the voltage of high voltage end
Pressure drop, for example, 0.7V or so.So control circuit can detecte voltage of the high voltage end relative to switching node SW, table is obtained
Levy the signal of first switch tube body diode conducting.Control circuit is controlled according to the signal that first switch tube body diode is connected
The conducting of upper tube, at 23 moment, the output signal PWMH of control circuit is got higher by low, makes upper tube by upper tube drive circuit 300
M01 conducting.Control circuit obtains upper tube body diode current flow signal, to be precisely controlled by directly detecting high-end voltage
Pipe conducting.In this embodiment, it is illustrated by taking BOOST circuit as an example, which is not limited to BOOST circuit, Ke Yishi
For any switching circuit with upper down tube, such as four switch BUCK-BOOST circuits.
It please refers to shown in Fig. 1, control circuit includes the first body diode conduction detection circuit 100 and the first logic or adjustment
Circuit 200, the first body diode conduction detection circuit 100 receive the high voltage end voltage, obtain characterization first switch
The signal of tube body diode current flow, first logic or adjustment circuit 200 receive characterization first switch tube body diode conducting
Signal, generate the first switch tube Continuity signal.
The first body diode conduction detection circuit is voltage comparator circuit, and detection high voltage end voltage compares switching node
When the low first threshold of voltage, the body diode conducting of first switch tube is characterized.
It is the body diode of first switch tube when detecting lower than the node voltage first threshold of high voltage end voltage
22 moment in turn-on instant, that is, Fig. 3.
First logic or adjustment circuit are the first logic circuit, the first logic circuit detection first switch tube
Body diode conducting, and when upper tube Continuity signal TON is effective, control the first switch tube conducting.
Please refer to shown in Fig. 4, the first logic circuit 200 be with door 201, with door 201 receive characterization first switch tube body
Diode current flow signal A and upper tube Continuity signal TON generates first switch tube Continuity signal PWMH.
In another embodiment, first logic or adjustment circuit are the first adjustment circuit, the first adjustment electricity
Road obtains first switch tube body diode turn-on time 30 according to the signal of characterization first switch tube body diode conducting, according to institute
State the turn-on instant that first switch tube body diode turn-on time 30 adjusts the first switch tube.
It please refers to shown in Fig. 5, control circuit further includes ON-OFF control circuit 700 and the first level shifting circuit 800, described
ON-OFF control circuit 700 generates the first upper tube and controls signal TON ', and the first upper tube control signal TON ' passes through the level
Conversion circuit 800 generates upper tube Continuity signal TON, and the upper tube Continuity signal TON is in the down tube Continuity signal BON by having
Before effect becomes invalid, from becoming effective in vain.Wherein, the reference ground of ON-OFF control circuit 700 is low-voltage end, and feeder ear is
Power vd.
ON-OFF control circuit 700 generates down tube Continuity signal BON and the first upper tube controls signal TON ', due to the drive of upper tube
The reference ground of dynamic circuit 300 is switching node SW, therefore the first upper tube control signal TON ' is needed by the first level conversion electricity
Road 800 is converted into the upper tube Continuity signal TON relative to switching node SW.In the prior art, upper tube Continuity signal TON
Be directly over tube drive circuit driving upper tube M01, that is, down tube Continuity signal BON and the first upper tube control signal TON ' it
Between have certain dead time, in the dead time, down tube Continuity signal BON and the first upper tube control signal TON ' all be nothing
Effect.It please refers to shown in Fig. 3, in the present invention, when there is no dead zone between down tube Continuity signal BON and the first upper tube control signal TON '
Between, the first upper tube controls signal TON ' in down tube Continuity signal BON by before effectively neutralizing, from becoming in vain effectively, also
Be have the first upper tube of time control signal TON ' and down tube Continuity signal BON be all effective.When detecting that high voltage end ratio opens
The low first threshold of artis SW, characterizes upper tube body diode current flow, and letter is connected in the output first switch tube of the first logic circuit 200
From becoming in vain effectively, upper tube drive circuit 300 controls upper tube M01 conducting by number PWMH.Therefore, the dead time between upper down tube
It is not influenced by the delay of the first level shifting circuit 800.
The first switch tube body diode turn-on time 30 and target value are compared by the first adjustment circuit, when
The first switch tube body diode turn-on time is less than target value, the first adjustment circuit the leading the first switch tube
Logical moment delay, when the first switch tube body diode turn-on time 30 is greater than target value, the first adjustment circuit is by institute
The turn-on instant for stating first switch tube shifts to an earlier date.
The present invention provides a kind of switching circuit control method, and the switching circuit includes first switch tube and second switch
Pipe, 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 the switching node is to detect the high voltage end voltage with reference to ground,
The signal of characterization first switch tube body diode conducting is obtained, according to the letter of the characterization first switch tube body diode conducting
Number, control the turn-on instant of the first switch tube.
In one embodiment, when detection lower than the node voltage first threshold of high voltage end voltage, then the is characterized
The body diode of one switching tube is connected.
In one embodiment, the body diode conducting of first switch tube is detected, and upper tube Continuity signal is effective, control
The first switch tube conducting.
In one embodiment, first switch tube body is obtained according to the signal of characterization first switch tube body diode conducting
The diode current flow time, when adjusting the conducting of the first switch tube according to the first switch tube body diode turn-on time
It carves.
In one embodiment, the upper tube Continuity signal in down tube Continuity signal from before effectively becoming invalid, by
Become in vain effective.
In one embodiment, the first switch tube body diode turn-on time and target value are compared, when
The first switch tube body diode turn-on time is less than target value, and the turn-on instant of the first switch tube is postponed, institute is worked as
First switch tube body diode turn-on time is stated greater than target value, the turn-on instant of the first switch tube is shifted to an earlier date.
It please refers to shown in Fig. 6 and Fig. 7, the present invention also provides a kind of control circuit of switching circuit, the switching circuit packet
First switch tube M01 and second switch M02, the first switch tube M01 and the second switch M02 series connection are included, it is described
First switch tube M01 is connected to high voltage end, and the second switch M02 is connected to low-voltage end, the first switch tube M01
For upper tube, the second switch M02 is down tube, and the common node of the first switch tube and the second switch is switch
Node SW, as shown in fig. 6, the low-voltage end is with reference to ground, the control circuit detects the node voltage, alternatively,
As shown in fig. 7, the switching node is with reference to ground, the control circuit detects the high voltage end voltage, obtains characterization first
The signal B of switching tube body diode conducting, the letter that the control circuit is connected according to the characterization first switch tube body diode
Number B, controls the turn-on instant of the second switch.
Including the second body diode conduction detection circuit 400 and the second logic or adjustment circuit 500, two pole of the second body
Pipe conduction detection circuit 400 receives the node voltage or the high voltage end voltage, obtains characterization first switch tube body
The signal of diode current flow, second logic or adjustment circuit 500 receive the letter of characterization first switch tube body diode conducting
Number, generate the second switch Continuity signal PWML.
It please refers to shown in Fig. 7, in one embodiment, the second body diode conduction detection circuit 400 is voltage ratio
Compared with circuit, the switching node be with reference to ground, when detection lower than the node voltage first threshold of high voltage end voltage, characterization the
The body diode of one switching tube is connected.Refering to what is shown in Fig. 8, the body diode of first switch tube is connected, high voltage end at 25 moment
Voltage first threshold lower than switching node SW.
Since the reference voltage of voltage comparator circuit is switching node SW, so needing to pass through the output of voltage comparator circuit
Over level conversion circuit is transformed into low-voltage end.With continued reference to shown in Fig. 7, control circuit further includes second electrical level conversion circuit
900, the output voltage of the voltage comparator circuit is received, the reference electricity of the body diode Continuity signal of first switch tube will be characterized
Flat to be converted into the low-voltage end from the switching node, second logic or adjustment circuit receive the second electrical level conversion
The output voltage of circuit.
It please refers to shown in Fig. 6, the body diode conduction detection circuit is edge sense circuit, and the low-voltage end is ginseng
Ground is examined, the rising edge of the switching node is detected, characterizes the body diode conducting of second switch.
Refering to what is shown in Fig. 9, being one embodiment of edge sense circuit, edge sense circuit includes 401 He of first resistor
First capacitor 402, the first resistor 401 and the first capacitor 402 are connected, and the first capacitor 402 is connected to joint
Point SW, the first resistor 401 are connected to low-voltage end, and the common node of the first resistor and the first capacitor is characterization
The signal of first switch tube body diode conducting, that is, the output B of edge sense circuit.When there is voltage at SW relative low voltage end
Jump, then the voltage jump is coupled to B point by capacitor 402, therefore can detect the jump of voltage by detecting B point voltage
Become.
In one embodiment, second logic or adjustment circuit are the second logic circuit, second logic circuit
The body diode conducting of first switch tube is detected, and when down tube Continuity signal is effective, controls the second switch conducting.
In another embodiment, second logic or adjustment circuit are second adjustment circuit, the second adjustment electricity
Road obtains first switch tube body diode turn-on time according to the signal of characterization first switch tube body diode conducting, according to described
First switch tube body diode turn-on time adjusts the turn-on instant of the second switch.
Refering to what is shown in Fig. 8, second adjustment circuit by the first switch tube body diode turn-on time 31 and target value into
Row compares, and when the first switch tube body diode turn-on time 31 is less than target value, the second adjustment circuit is by described the
The turn-on instants of two switching tubes postpones, and is greater than target value when the first switch tube body diode was connected for 31 times, and described second
Adjustment circuit shifts to an earlier date the turn-on instant of the second switch.
Second adjustment circuit passes through the rising edge for detecting the switching node SW, and the body diode for obtaining first switch tube is opened
At the time of beginning to be connected；The second adjustment circuit obtains first switch tube by the failing edge of the detection switching node SW
At the time of body diode turns off.To the body diode of first switch tube at the time of being begun to turn on from the body diode of first switch tube
The as turn-on time of the body diode of first switch tube at the time of shutdown.
Second adjustment circuit can also obtain the body two of first switch tube by the rising edge of detection second switch tube grid
At the time of pole pipe turns off.
It please refers to shown in Figure 10, control circuit further includes ON-OFF control circuit 700 and the first level shifting circuit 800, institute
State ON-OFF control circuit generate down tube Continuity signal BON, the down tube Continuity signal BON the upper tube Continuity signal TON by
Before effectively becoming invalid, from becoming effective in vain.Wherein, the reference ground of ON-OFF control circuit 400 is low-voltage end, feeder ear
For power vd.
ON-OFF control circuit 700 generates down tube Continuity signal BON and the first upper tube controls signal TON ', due to the drive of upper tube
The reference ground of dynamic circuit 300 is switching node SW, therefore the first upper tube control signal TON ' is needed by the first level conversion electricity
Road 800 is converted into the upper tube Continuity signal TON relative to switching node SW.In the prior art, upper tube Continuity signal TON
By upper tube drive circuit 300 drive upper tube M01, that is, down tube Continuity signal BON and the first upper tube control signal TON ' it
Between have certain dead time, in the dead time, down tube Continuity signal BON and the first upper tube control signal TON ' all be nothing
Effect.And in the present invention, there is no dead time, down tube conducting between down tube Continuity signal BON and the first upper tube control signal TON '
Signal BON from before effectively becoming invalid, from becoming in vain effectively, that is, has a section time upper tube in upper tube Continuity signal TON
Continuity signal TON and down tube Continuity signal BON is effective.The waveform of upper tube Continuity signal TON and down tube Continuity signal BON can
To refer to Fig. 8.
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 switching circuit control method, the switching circuit include first switch tube and second switch, it is characterised in that:
The first switch tube and second switch series connection, the first switch tube are connected to high voltage end, the second switch
Pipe is connected to low-voltage end, and the first switch tube is upper tube, and the second switch is down tube, the first switch tube and institute
The common node for stating second switch is switching node, and the switching node is to detect the high voltage end voltage with reference to ground, obtain
To characterization first switch tube body diode conducting signal, according to it is described characterization first switch tube body diode conducting signal,
Control the turn-on instant of the first switch tube.
2. switching circuit control method according to claim 1, it is characterised in that: detection high voltage end voltage compares joint
When the point low first threshold of voltage, then the body diode conducting of first switch tube is characterized.
3. switching circuit control method according to claim 2, it is characterised in that: detect the body diode of first switch tube
Conducting, and upper tube Continuity signal is effective, controls the first switch tube conducting.
4. switching circuit control method according to claim 2, it is characterised in that: according to characterization two pole of first switch tube body
The signal of pipe conducting obtains first switch tube body diode turn-on time, according to the first switch tube body diode turn-on time
Adjust the turn-on instant of the first switch tube.
5. switching circuit control method according to claim 3 or 4, it is characterised in that: the upper tube Continuity signal is under
Pipe Continuity signal is from before effectively becoming invalid, from becoming effective in vain.
6. switching circuit control method according to claim 4, it is characterised in that: by the first switch tube body diode
Turn-on time and target value are compared, when the first switch tube body diode turn-on time is less than target value, by described the
The turn-on instant of one switching tube postpones, when the first switch tube body diode turn-on time is greater than target value, by described first
The turn-on instant of switching tube shifts to an earlier date.
7. a kind of switching circuit control method, the switching circuit include first switch tube and second switch, it is characterised in that:
The first switch tube and second switch series connection, the first switch tube are connected to high voltage end, the second switch
Pipe is connected to low-voltage end, and the first switch tube is upper tube, and the second switch is down tube, the first switch tube and institute
The common node for stating second switch is switching node, and the low-voltage end is reference ground, detects the node voltage, or
Person, the switching node are to detect the high voltage end voltage with reference to ground, obtain characterization first switch tube body diode conducting
Signal controls the turn-on instant of the second switch according to the signal of the characterization first switch tube body diode conducting.
8. switching circuit control method according to claim 7, it is characterised in that: when the switching node be with reference to ground,
When detecting lower than the node voltage first threshold of high voltage end voltage, then the body diode conducting of first switch tube is characterized；When
The low-voltage end is with reference to ground, and detecting the node voltage has rising edge, then characterizes the body diode of first switch tube
Conducting.
9. switching circuit control method according to claim 8, it is characterised in that: detect the body diode of first switch tube
Conducting, and down tube Continuity signal is effective, controls the second switch conducting.
10. switching circuit control method according to claim 8, it is characterised in that: according to characterization first switch tube body two
The signal of pole pipe conducting obtains first switch tube body diode turn-on time, when being connected according to the first switch tube body diode
Between adjust the turn-on instant of the second switch.
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| CN201811108311.4A CN109039076A (en) | 2018-09-21 | 2018-09-21 | Control method, control circuit and the switching circuit of switching circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811108311.4A CN109039076A (en) | 2018-09-21 | 2018-09-21 | Control method, control circuit and the switching circuit of switching circuit |
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| CN109039076A true CN109039076A (en) | 2018-12-18 |
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| CN201811108311.4A Pending CN109039076A (en) | 2018-09-21 | 2018-09-21 | Control method, control circuit and the switching circuit of switching circuit |
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| US20090027020A1 (en) * | 2007-07-23 | 2009-01-29 | Intersil Americas Inc. | Threshold voltage monitoring and control in synchronous power converters |
| US20150049529A1 (en) * | 2013-08-14 | 2015-02-19 | Dora S.P.A. | Control method for rectifier of switching converters |
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| CN106208692A (en) * | 2016-08-31 | 2016-12-07 | 杰华特微电子（杭州）有限公司 | The control method of on-off circuit, control circuit and switch circuit devices |
| CN107834849A (en) * | 2017-11-02 | 2018-03-23 | 杰华特微电子（张家港）有限公司 | Switching power source control circuit and control method |
| CN209120063U (en) * | 2018-09-21 | 2019-07-16 | 杰华特微电子（杭州）有限公司 | The control circuit and switching circuit of switching circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090027020A1 (en) * | 2007-07-23 | 2009-01-29 | Intersil Americas Inc. | Threshold voltage monitoring and control in synchronous power converters |
| US20150049529A1 (en) * | 2013-08-14 | 2015-02-19 | Dora S.P.A. | Control method for rectifier of switching converters |
| US20160248412A1 (en) * | 2015-02-23 | 2016-08-25 | Rohm Co., Ltd. | Dead time adjusting circuit |
| CN106208692A (en) * | 2016-08-31 | 2016-12-07 | 杰华特微电子（杭州）有限公司 | The control method of on-off circuit, control circuit and switch circuit devices |
| CN107834849A (en) * | 2017-11-02 | 2018-03-23 | 杰华特微电子（张家港）有限公司 | Switching power source control circuit and control method |
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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 Applicant after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Applicant before: JOULWATT TECHNOLOGY Inc.,Ltd. |