CN207459969U - Inductive current AC compounent reconstruction circuit, control circuit and on-off circuit - Google Patents
Inductive current AC compounent reconstruction circuit, control circuit and on-off circuit Download PDFInfo
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- CN207459969U CN207459969U CN201721448086.XU CN201721448086U CN207459969U CN 207459969 U CN207459969 U CN 207459969U CN 201721448086 U CN201721448086 U CN 201721448086U CN 207459969 U CN207459969 U CN 207459969U
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Abstract
The utility model discloses a kind of inductive current AC compounent reconstruction circuit, control circuit and on-off circuits for on-off circuit.Inductive current AC compounent reconstruction circuit includes：Integrating circuit and bias set circuti, the first input end of integrating circuit receives the signal of characterization node voltage, integrating circuit integrates the voltage of its first input end and the difference of bias voltage, the output voltage of integrating circuit contains the information for characterizing the inductive current AC compounent, and bias set circuti adjusts the direct current biasing of the output voltage of the integrating circuit to first voltage.By reconstructing inductive circuit AC compounent, output is controlled, circuit transient response is good, is not required to sampling inductive current, avoids influence of the switching process to control circuit, control circuit is simpler.
Description
Technical field
The utility model is related to power electronics fields, and in particular to a kind of inductive current AC compounent reconstruction circuit,
Control circuit and on-off circuit.
Background technology
In Switching Power Supply, in order to improve the transient response of Switching Power Supply, controlled using current-mode.By inductance electricity
Stream sampled value and current threshold are compared, in peak-current mode, when inductive current sampled value is more than current threshold, then
Main switch turns off；In valley-current mode, when inductive current sampled value is less than current threshold, then main switch turns on.
Therefore, it is necessary to sample inductive current under current-mode.Since switching tube turns in Switching Power Supply, fly-wheel diode is deposited when turning off
In Reverse recovery so that can have overshoot on switching moments, inductive current sampled signal.The overshoot to switch in order to prevent
Pipe generation opens by mistake pass, it is therefore desirable to add in blanking circuit.Overshoot i.e. in inductive current sampled value terminate and then by inductance electricity
Stream sampled signal and current threshold compare, and overshoot signal and current threshold is prevented to be compared, so as to generate false triggering, makes switch
Pipe generation opens by mistake pass.The prior art needs to sample inductive current, and the requirement to sample circuit is high, and needs to add in and disappear
Hidden circuit, control are complicated.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of inductive current AC compounent reconstruction circuit, control electricity
Road and on-off circuit, to solve to need to sample inductive current in the prior art, the requirement to sample circuit is high, and
It needs to add in blanking circuit, controls the problem of complicated.
The technical solution of the utility model is to provide a kind of inductive current AC compounent reconstruction circuit, the switch
Circuit includes switching tube, fly-wheel diode or synchronous rectifier and inductance, the switching tube, fly-wheel diode or synchronous rectification
The common node of pipe and inductance is switching node, and the inductive current AC compounent reconstruction circuit includes：
Integrating circuit and bias set circuti,
The first input end of the integrating circuit receives the signal for characterizing the node voltage, the integrating circuit pair
The voltage of its first input end and the difference of bias voltage are integrated, and the output voltage of the integrating circuit contains described in characterization
The information of inductive current AC compounent, the bias set circuti adjust the direct current biasing of the output voltage of the integrating circuit
To first voltage.
As optional, the output voltage of the bias set circuti reception integrating circuit, and adjust the integration electricity
The bias voltage on road.
As optional, when the on-off circuit is operated in discontinuous conduction mode, the bias set circuti is in inductance electricity
When stream is zero, the output of the integrating circuit is set to zero.
As optional, capacitive divider circuit is further included, the switching node is connected to institute by the capacitive divider circuit
State the first input end of integrating circuit.
As optional, the output voltage of the bias set circuti reception integrating circuit, and its output terminal connects
To the first input end of the integrating circuit, and adjust the first input end voltage of the integrating circuit.
As optional, the integrating circuit includes the first amplifier and the 3rd capacitance,
The positive input terminal of first amplifier is the first input end of the integrating circuit, and the negative input of the first amplifier terminates
Bias voltage is received, first amplifier is transconductance type amplifier, and the output terminal of first amplifier passes through the 3rd capacitance connection
To reference ground；The output of first amplifier is the output of the integrating circuit.
As optional, the bias set circuti includes the second amplifier, first resistor, second resistance, 3rd resistor and the
Four capacitances,
The output of the integrating circuit is connected to the negative input end of second amplifier by the first resistor, and described
One voltage is connected to the positive input terminal of second amplifier,
When second amplifier is transconductance type amplifier, the output terminal of second amplifier passes through capacitance connection to reference
Ground；When second amplifier is voltage-type amplifier, the output terminal of second amplifier passes through the 4th capacitance connection to the
The negative input end of two amplifiers；
The output of second amplifier is connected to the positive input terminal of second amplifier by the second resistance；Described
The positive input terminal of one amplifier is connected to the negative input end of first amplifier by the 3rd resistor.
As optional, the on-off circuit is four switch Buckboost circuits, including first switch pipe, second switch pipe,
3rd switching tube, the 4th switching tube and inductance, the first switch pipe and second switch pipe series connection, the first switch pipe
Common port with the second switch pipe is first switch node, and the first switch pipe is connected to input terminal, and described second opens
It closes pipe and is connected to ground, the 3rd switching tube and the 4th switching tube series connection, the 3rd switching tube and the 4th switch
The common port of pipe is second switch node, and the 3rd switching tube is connected to output terminal, and the 4th switching tube is connected to ground, institute
Inductance connection is stated between the first switch node and the second switch node,
Second input terminal of the integrating circuit receives the signal for characterizing the second switch node voltage.
Another technical solution of the utility model is to provide a kind of control circuit of on-off circuit, including such as inductance
Current alternating component reconstruction circuit, comparison circuit and logic circuit,
The switching node is connected to the input terminal of the inductive current AC compounent reconstruction circuit, and the comparison circuit connects
The output signal and first threshold of the inductive current AC compounent reconstruction circuit are received, and is compared, the logic circuit
Receive the output signal of the comparison circuit, output switching signal controls the turn-on and turn-off of switching tube in the on-off circuit.
As optional, the comparison circuit is first comparator and the second comparator, described in the first comparator receives
The output signal of inductive current AC compounent reconstruction circuit and the first threshold, and be compared, generate switching tube shut-off letter
Number, the first threshold is the sum of thermal compensation signal and tertiary voltage, and the thermal compensation signal is the output electricity to the on-off circuit
Pressure or output current and reference voltage carry out the signal that operation amplifier obtains, and second comparator receives the inductive current and hands over
The output signal and second threshold of flow component reconstruction circuit, and be compared, generate switching tube Continuity signal, the second threshold
For the thermal compensation signal and the difference of the tertiary voltage.
As optional, clock circuit, the comparison circuit inductive current AC compounent reconstruction circuit are further included
Output signal and the first threshold, generate switching tube cut-off signals, the clock circuit receives the switching signal, goes forward side by side
Row timing generates switching tube Continuity signal, and the first threshold is thermal compensation signal, and the thermal compensation signal is to the on-off circuit
Output voltage or output current and reference signal carry out the signal that operation amplifier obtains.
As optional, clock circuit, the comparison circuit inductive current AC compounent reconstruction circuit are further included
Output signal and the first threshold, generate switching tube Continuity signal, the clock circuit receives the switching signal, goes forward side by side
Row timing generates switching tube cut-off signals, and the first threshold is thermal compensation signal, and the thermal compensation signal is to the on-off circuit
Output voltage or output current and reference signal carry out the signal that operation amplifier obtains.
The another technical solution of the utility model is to provide a kind of on-off circuit.
Using the circuit structure and method of the utility model, compared with prior art, has the following advantages：By reconstructing electricity
Inductive circuit AC compounent controls output.Circuit transient response is good, need not sample inductive current, avoid switching process
Influence to control circuit, control circuit are simpler.
Description of the drawings
Fig. 1 is the schematic diagram of the utility model inductive current AC compounent reconstruction circuit 100；
Fig. 2 is the block diagram of on-off circuit 300；
Fig. 3 is circuit diagram when power circuit 320 is Buck reduction voltage circuits；
Fig. 4 is a kind of 100 schematic diagram of embodiment of the utility model inductive current AC compounent reconstruction circuit；
Fig. 5 is the integrating circuit 110 and bias set circuti when the utility model bias set circuti adjusts bias voltage
A kind of circuit diagram of 120 embodiment；
Fig. 6 is the integrating circuit 110 and bias set circuti when the utility model bias set circuti adjusts bias voltage
The circuit diagram of 120 another embodiment；
Fig. 7 is a kind of circuit diagram of embodiment of the utility model capacitive divider circuit 130；
Fig. 8 is the circuit diagram of another embodiment of the utility model capacitive divider circuit 130；
Fig. 9 is the schematic diagram for the voltage that bias set circuti 120 adjusts first node V1；
Integrating circuit 110 and biasing when Figure 10 is the voltage that the utility model bias set circuti adjusts first node V1
Adjust the circuit diagram of one embodiment of circuit 120；
Figure 11 is the circuit diagram of one embodiment of the utility model integrating circuit 110；
Figure 12 is the circuit diagram of the another embodiment of the utility model integrating circuit 110 and bias set circuti 120；
Figure 13 is circuit diagram when power circuit 320 is four switch Buckboost step-up/step-down circuits；
Figure 14 is that inductive current when the utility model power circuit 320 is four switch Buckboost step-up/step-down circuits is handed over
The schematic diagram of flow component reconstruction circuit 100；
Figure 15 is that inductive current when the utility model power circuit 320 is four switch Buckboost step-up/step-down circuits is handed over
Another schematic diagram of flow component reconstruction circuit 100；
Figure 16 is the integrating circuit 110 when the utility model power circuit 320 is four switch Buckboost step-up/step-down circuits
With the circuit diagram of one embodiment of bias set circuti 120；
Figure 17 is the utility model power circuit 320 when being four switch Buckboost step-up/step-down circuits, integrating circuit 110
One embodiment circuit diagram；
Figure 18 is the integrating circuit 110 when the utility model power circuit 320 is four switch Buckboost step-up/step-down circuits
With the circuit diagram of another embodiment of bias set circuti 120；
Figure 19 is the schematic diagram of one embodiment of the utility model control circuit 200；
Figure 20 is the schematic diagram of another embodiment of the utility model control circuit 200.
Specific embodiment
The preferred embodiment of the utility model is described in detail below in conjunction with attached drawing, but the utility model is not merely
It is limited to these embodiments.The utility model covers any replacement made in the spirit and scope of the utility model, modification, equivalent
Method and scheme.
In order to which the public is made to have thorough understanding to the utility model, in following the preferred embodiment in the utility model specifically
Understand concrete details, and description without these details can also understand that this practicality is new completely for a person skilled in the art
Type.
The utility model is more specifically described by way of example referring to the drawings in the following passage.It should be noted that attached drawing
Using more simplified form and using non-accurate ratio, only to it is convenient, lucidly aid in illustrating the utility model
The purpose of embodiment.
Refering to what is shown in Fig. 1, a kind of inductive current AC compounent reconstruction circuit 100 for on-off circuit 300, the switch
Circuit 300 includes switching tube, fly-wheel diode or synchronous rectifier and inductance, the switching tube, fly-wheel diode or synchronization
The common node of rectifying tube and inductance is switching node, and the inductive current AC compounent reconstruction circuit 100 includes：Integrating circuit
110 and bias set circuti 120, the first input end of the integrating circuit 110 receives the letter for characterizing the node voltage
Number, the integrating circuit 110 integrates the voltage of its first input end and the difference of bias voltage, the integrating circuit
110 output voltage contains the information for characterizing the inductive current AC compounent, and the bias set circuti 120 is by the integration
The direct current biasing of the output voltage of circuit 110 is adjusted to first voltage.
The utility model only needs node voltage that can rebuild inductive current AC compounent, circuit letter
List, realization are convenient, at low cost.
Refering to what is shown in Fig. 2, on-off circuit 300 includes control circuit 200, driving circuit 310 and power circuit 320.Switch
The power circuit 320 of circuit has Buck reduction voltage circuits, Boost circuit, Buckboost step-up/step-down circuits, four switches
A variety of circuits such as Buckboost step-up/step-down circuits.Refering to what is shown in Fig. 3, circuit when being Buck reduction voltage circuits for power circuit 320
Schematic diagram, M321 are switching tube, and M322 is synchronous rectifier, and L321 is inductance, and the common node of M321, M322 and L321 are to open
Artis.
As a kind of embodiment, refering to what is shown in Fig. 4, the bias set circuti 120 receives the integrating circuit 110
Output voltage, and adjust the bias voltage of the integrating circuit.
As a kind of embodiment, refering to what is shown in Fig. 5, integrating circuit 110 includes the first amplifier 111 and the 3rd capacitance
C111, the positive input terminal of first amplifier 111 are the first input end of the integrating circuit 110, and bearing for the first amplifier 111 is defeated
Enter end and receive bias voltage, first amplifier 111 is transconductance type amplifier, and the output terminal of first amplifier passes through the capacitance
C111 is connected to reference ground；The output of first amplifier 111 is the output Vac of the integrating circuit 110.Bias set circuti
120 include amplifier 123,124, resistance R124, R125, R127 and capacitance C123, and the output Vac of integrating circuit 110 passes through resistance
R124 is connected to the negative input end of the amplifier 123, and the output terminal of amplifier 123 is connected to the negative defeated of amplifier 123 by capacitance 123
Enter end, the output of amplifier 123 is connected to the negative input end of amplifier 124 by resistance R125, and the output terminal of amplifier 124 passes through resistance
R127 is connected to the negative input end of amplifier 124, amplifier 123, and resistance 125 and resistance 127 form a phase inverter, amplifier 124
It exports as the output terminal of bias set circuti 120, is connected to the negative input end of integrating circuit 110, adjusts its bias voltage.Amplifier
124 and the positive input terminal of amplifier 123 be connected to first voltage VCOM.
As a kind of embodiment, refering to what is shown in Fig. 6, with Fig. 5 unlike, amplifier 125 be transconductance type amplifier, amplifier
125 positive input terminal receives the output voltage of integrating circuit 110, and output terminal is connected to reference ground, amplifier 125 by capacitance C124
Negative input end receive first voltage VCOM.The output of amplifier 125 is the output of bias set circuti 120.
As a kind of embodiment, when the on-off circuit is operated in discontinuous conduction mode, the bias set circuti
When inductive current is zero, the output of the integrating circuit is set to zero.
As a kind of embodiment, refering to what is shown in Fig. 7, further including capacitive divider circuit 130, the switching node passes through institute
Capacitive divider circuit is stated, is connected to the first input end of the integrating circuit.
Refering to what is shown in Fig. 7, switching node is connected by the capacitance C131 and the capacitance C132 circuit to be formed of connecting
To reference ground, the common node of the capacitance C131 and the capacitance C132 are the output of capacitive divider circuit, are first node
V1 is connected to the first input end of the integrating circuit 110.
Refering to what is shown in Fig. 8, for another embodiment of capacitive divider circuit 130, switching node passes through resistance R131 and resistance
R132 circuits to be formed of connecting are connected to reference ground, and the common node of resistance R131 and R132 is connected to described by capacitance C135
The common node of the first input end of the first input end of integrating circuit 110, capacitance C135 and integrating circuit 110 is capacitive divider
The output of circuit 130 is first node V1.
Capacitive divider circuit 130 can have other embodiments, be not limited only to two above-mentioned embodiments.
As a kind of embodiment, refering to what is shown in Fig. 9, switching node is connected to integration electricity by capacitive divider circuit 130
The first input end on road 110, the bias set circuti 120 receives the output voltage of the integrating circuit 110, and it is exported
End is connected to the first input end of the integrating circuit 110, and adjusts the first input end voltage of the integrating circuit 110.
As a kind of embodiment, refering to what is shown in Fig. 10, integrating circuit 110 includes the first amplifier 111 and the 3rd capacitance
C111, the positive input terminal of first amplifier 111 are the first input end of the integrating circuit 110, and bearing for the first amplifier 111 is defeated
Enter end and receive bias voltage, first amplifier 111 is transconductance type amplifier, and the output terminal of first amplifier passes through the described 3rd
Capacitance C111 is connected to reference ground；The output of first amplifier 111 is the output Vac of the integrating circuit 110.
As a kind of embodiment, with continued reference to shown in Figure 10, bias set circuti 120 includes the second amplifier 121, first
Resistance R123, second resistance R121,3rd resistor R122 and the 4th capacitance C121, the output Vac of integrating circuit 110 pass through described
First resistor R123 is connected to the negative input end of second amplifier 121, and the first voltage is connected to second amplifier 121
Positive input terminal.
When second amplifier 121 is transconductance type amplifier, the output terminal of second amplifier 121 passes through the described 4th electricity
Hold C121 and be connected to reference ground；When second amplifier 121 is voltage-type amplifier, the output terminal of second amplifier passes through institute
State the negative input end that the 4th capacitance C121 is connected to the second amplifier；Figure 10 is that the second amplifier 121 is voltage-type amplifier.Described second
The output of amplifier 121 is connected to the positive input terminal of second amplifier 121 by the second resistance R121；First amplifier
111 positive input terminal is connected to the negative input end of first amplifier 111 by the 3rd resistor R122.In Fig. 10, partially
Voltage is put equal to first voltage VCOM, the two can be unequal.
As a kind of embodiment, with reference to shown in figure 11, integrating circuit 110 includes voltage-type amplifier 112 and 113, resistance
R115, R116, R117 and capacitance C117.First node V1 is connected to the negative input end of amplifier 112, amplifier by resistance R115
112 output terminal is connected to the negative input end of amplifier 112 by resistance R116, and the output terminal of amplifier 112 is connected by resistance R117
The negative input end of amplifier 113 is connected to, the output terminal of amplifier 113 is connected to the negative input end of amplifier 113, amplifier by capacitance C117
112 are all connected with 113 positive input terminal with bias voltage.The output voltage of amplifier 112 is the output of integrating circuit 110.
With reference to shown in figure 12, as a kind of embodiment, amplifier is by current source I111, PMOS M111 and M112, NMOS
M113 and M114 is formed, and the output terminal of current source I111 is connected to the source electrode of PMOS M111 and M112, and the drain electrode of M111 is connected to
The drain electrode of NMOS M113, the drain electrode of M112 are connected to the drain electrode of NMOS M114, and M113 is connected with the source electrode of M114, and connects
To reference ground, M113 is connected with the grid of M114, and is connected to the drain electrode of M113, and the grid of M111 and M112 are respectively amplifier
Two input terminals, the output terminal of amplifier is the output terminal Vac of the drain electrode, i.e. integrating circuit 110 of M114, and passes through capacitance
C112 is connected to reference ground.First node V1 is connected to the grid of M111, and bias voltage is connected to PMOS by resistance R113
The grid of M111, bias voltage are connected to the grid of PMOS M112 simultaneously, and in fig. 12, bias voltage is equal to first voltage
VCOM.Bias set circuti 120 is made of resistance R123, and Vac is connected to the grid of M113 and M114 by resistance R123.
As a kind of embodiment, with reference to shown in figure 13, the on-off circuit is four switch Buckboost circuits, including
First switch pipe M323, second switch pipe M324, the 3rd switching tube M325, the 4th switching tube M325 and inductance L321, described
One switching tube M323 and second switch pipe M324 series connection, the first switch pipe M323 and the second switch pipe M324's
Common port is first switch node, and the first switch pipe is connected to input terminal VIN, and the second switch pipe is connected to ground, institute
State the 3rd switching tube M325 and the 4th switching tube M326 series connection, the 3rd switching tube M325 and the 4th switching tube
The common port of M326 is second switch node, and the 3rd switching tube M325 is connected to output terminal VOUT, the 4th switching tube
M326 is connected to ground, and the inductance L321 is connected between the first switch node and the second switch node.
With reference to shown in figure 14, the second input terminal of the integrating circuit 110, which receives, characterizes the second switch node voltage
Signal.
As a kind of embodiment, with reference to shown in figure 15, shown first switch node is connected by capacitive divider circuit 130
To the first input end of integrating circuit 110, second switch node is connected to integrating circuit 110 by capacitive divider circuit 130
Second input terminal is illustrated by taking the capacitive divider circuit of the capacitance composition of two series connection as an example, and the first switch node leads to
It crosses the capacitance C131 and capacitance C132 circuits to be formed of connecting and is connected to reference ground, the capacitance C131 and the capacitance
The common node of C132 is first node V1, is connected to the first input end of the integrating circuit 110, the second switch node
Reference ground, the capacitance C133 and the electricity are connected to by the capacitance C133 and the capacitance C134 circuit to be formed of connecting
Hold the common node of C134 for section point V2, be connected to the second input terminal of the integrating circuit 110.
As a kind of embodiment, with reference to shown in figure 16, there are two joints for four switch Buckboost step-up/step-down circuits
Point, first switch node and second switch node, Figure 16 and Figure 10 are connected to difference lies in bias voltage by resistance R111
The negative input end of first amplifier 111, section point V2 are connected to the negative input end of the first amplifier 111.Integrating circuit 110 is to first
The difference of node and section point, i.e. V1-V2 are integrated.It is identical in bias set circuti 120 and Figure 10 in Figure 16.
As a kind of embodiment, integrating circuit 110 is with reference to shown in figure 17 and Figure 11 is the difference is that section point V2
The positive input terminal of amplifier 112 is connected to by resistance R118, bias voltage is connected to the positive input of amplifier 112 by resistance R119
End.The circuit, which also achieves, integrates the difference of first node and section point.
As a kind of embodiment, integrating circuit 110 and bias set circuti 120 with reference to shown in figure 18 and Figure 12 not
It is that section point V2 is connected to the grid of M112 with part, bias voltage is connected to the grid of M112 by resistance R114.
The control circuit 200 of a kind of on-off circuit, including inductive current AC compounent reconstruction circuit 100, comparison circuit 210
With logic circuit 220, the switching node is connected to the input terminal of the inductive current AC compounent reconstruction circuit 100, described
Comparison circuit 210 receives the output signal and first threshold of the inductive current AC compounent reconstruction circuit 100, and is compared
Compared with the logic circuit 220 receives the output signal of the comparison circuit 210, and output switching signal PWM controls the switch
The turn-on and turn-off of switching tube in circuit.
With reference to shown in figure 19, as a kind of embodiment, the comparison circuit 210 compares for first comparator and second
Device, the first comparator receive the output signal Vac of the inductive current AC compounent reconstruction circuit and the first threshold,
And be compared, generate switching tube cut-off signals, the first threshold be the sum of thermal compensation signal Vc and tertiary voltage V1, the benefit
It is that the signal that operation amplifier obtains is carried out to the output voltage or output current and reference signal of the on-off circuit to repay signal Vc,
Second comparator receives the output signal and second threshold of the inductive current AC compounent reconstruction circuit, and is compared
Compared with generation switching tube Continuity signal, the second threshold is the difference of the thermal compensation signal Vc and tertiary voltage V1.
The negative input end of first comparator is connected to Vac, Vc+V1 is connected to the positive input terminal of first comparator, and Vac connects
The positive input terminal of the second comparator is connected to, Vc-V1 is connected to exemplified by the negative input end of the second comparator, when Vac is more than or equal to Vc+
During V1, the output A1 of first comparator becomes logic low by logically high, and the output A2 of the second comparator is logically high, logic circuit
220 receive the signal, and output pwm signal control switching tube shut-off, by taking the Buck reduction voltage circuits of Fig. 3 as an example, pwm signal controls
Switching tube turns off, and driving circuit 310 receives the pwm signal, and it is low level to generate drive signal DRV1 and DRV2, DRV1, DRV2
For high level, main switch M321 shut-offs, synchronous rectifier M322 conductings；After switching tube shut-off, inductive current declines, and Vac is small
Become logically high by logic low in Vc+V1, the output A1 of first comparator, pwm signal state remains unchanged.Inductive current continues
Decline, when Vac is less than Vc-V1, the output A2 of the second comparator becomes logic low by logically high, and the output A1 of first comparator is
Logically high, logic circuit 220 receives the signal, and output pwm signal control switching tube conducting continues the Buck decompressions with Fig. 3
Exemplified by circuit, pwm signal control switching tube conducting, driving circuit 310 receive the pwm signal, generate drive signal DRV1 and
DRV2, DRV1 are high level, and DRV2 is low level, and main switch M321 is turned on, synchronous rectifier M322 shut-offs；Switching tube turns on
Afterwards, inductive current rises, and Vac rises.
With reference to shown in figure 13, in four switch Buckboost step-up/step-down circuits, when input voltage is higher than output voltage,
Pwm signal control switching tube conducting, the drive signal DRV3 and DRV5 that driving circuit 310 generates are high level, DRV4 and DRV6
For low level, M323 and M325 conductings, M324 and M426 shut-offs, inductive current rise；Pwm signal control switching tube shut-off, drives
The drive signal DRV4 and DRV5 that dynamic circuit 310 generates are high level, and DRV3 and DRV6 are low level, and M324 and M325 are turned on,
M323 and M426 shut-offs, inductive current decline；When the input voltage is lower than the output voltage, pwm signal control switching tube conducting, drives
The drive signal DRV3 and DRV6 that dynamic circuit 310 generates are high level, and DRV4 and DRV5 are low level, and M323 and M326 are turned on,
M324 and M425 shut-offs, inductive current rise；Pwm signal control switching tube shut-off, the drive signal that driving circuit 310 generates
DRV3 and DRV5 is high level, and DRV4 and DRV6 are low level, M323 and M325 conductings, and M324 and M426 are turned off, inductive current
Decline.
The application range of the utility model be not limited only to the power circuit of above-described embodiment analysis for Buck reduction voltage circuits and
Four switch Buckboost circuits, can also be applied to the various switching power circuits such as Boost circuit.
With reference to shown in figure 20, control circuit 200 further includes clock circuit 230,210 inductance of comparison circuit
The output signal Vac of current alternating component reconstruction circuit 100 and the first threshold generate switching tube cut-off signals, when described
Clock circuit 230 receives the switching signal PWM, and carries out timing, generates switching tube Continuity signal, and the first threshold is compensation
Signal Vc, the thermal compensation signal Vc are to carry out computing to the output voltage or output current and reference signal of the on-off circuit to put
The signal obtained greatly.
Above-mentioned control mode is Peak Current-Mode Controlled Circuit.Clock circuit 230 switching tube from shut-off to conducting when
Proceed by timing quarter, timing to cycle T generates switching tube Continuity signal, then it is T that can cause switch periods.The reality of Figure 19
It applies the analysis in example on switching tube Continuity signal and switching tube cut-off signals and is also applied for the embodiment, details are not described herein.
With reference to shown in figure 20, control circuit 200 further includes clock circuit 230,210 inductance of comparison circuit
The output signal Vac of current alternating component reconstruction circuit 100 and the first threshold generate switching tube Continuity signal, when described
Clock circuit 230 receives the switching signal, and carries out timing, generates switching tube cut-off signals, and the first threshold is believed for compensation
Number Vc, the thermal compensation signal Vc are to carry out operation amplifier with reference voltage to the output voltage or output current of the on-off circuit
Obtained signal.
Above-mentioned control mode is valley point current control model.Clock circuit 230 switching tube from be conducting to shut-off when
Proceed by timing quarter, timing to cycle T generates switching tube cut-off signals, then it is T that can cause switch periods.The reality of Figure 19
It applies the analysis in example on switching tube Continuity signal and switching tube cut-off signals and is also applied for the embodiment, details are not described herein.
In above several control modes, output is controlled by the AC compounent for then passing through inductive current, due to can't see
The D. C. value of inductive current, the scope of offset voltage Vc is very small, therefore generates the design of the operational amplifier of offset voltage Vc
The corresponding operational amplifier in current control mode is easier to design than in the prior art.
The invention also discloses a kind of on-off circuit, including the control circuit.Refering to what is shown in Fig. 1, control circuit
200 generate switching signal PWM, and driving circuit 310 generates drive signal DRV, driving power circuit 320 according to switching signal PWM
In switching tube and synchronous rectifier turn on and off.
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 form the restriction to the technical solution protection domain.It is any in above-mentioned implementation
Modifications, equivalent substitutions and improvements made within the spirit and principle of mode etc., should be included in the protection model of the technical solution
Within enclosing.
Claims (10)
1. a kind of inductive current AC compounent reconstruction circuit for on-off circuit, the on-off circuit includes switching tube, afterflow
The common node of diode or synchronous rectifier and inductance, the switching tube, fly-wheel diode or synchronous rectifier and inductance
For switching node, which is characterized in that the inductive current AC compounent reconstruction circuit includes：
Integrating circuit and bias set circuti,
The first input end of the integrating circuit receives the signal for characterizing the node voltage, the integrating circuit to its
The voltage of one input terminal and the difference of bias voltage are integrated, and the output voltage of the integrating circuit contains the characterization inductance
The information of current alternating component, the bias set circuti adjust the direct current biasing of the output voltage of the integrating circuit to the
One voltage.
2. inductive current AC compounent reconstruction circuit according to claim 1, it is characterised in that：The bias set circuti
The output voltage of the integrating circuit is received, and adjusts the bias voltage of the integrating circuit.
3. inductive current AC compounent reconstruction circuit according to claim 1, it is characterised in that：When the on-off circuit work
Make in discontinuous conduction mode, the bias set circuti is when inductive current is zero, by the output set of the integrating circuit
To zero.
4. inductive current AC compounent reconstruction circuit according to claim 1, it is characterised in that：Further include capacitive divider electricity
Road, the switching node are connected to the first input end of the integrating circuit by the capacitive divider circuit.
5. inductive current AC compounent reconstruction circuit according to claim 4, it is characterised in that：The bias set circuti
The output voltage of the integrating circuit is received, and its output terminal is connected to the first input end of the integrating circuit, and adjust
The first input end voltage of the integrating circuit.
6. inductive current AC compounent reconstruction circuit according to claim 4, it is characterised in that：The integrating circuit includes
First amplifier and the 3rd capacitance,
The positive input terminal of first amplifier is the first input end of the integrating circuit, and the negative input end of the first amplifier receives partially
Voltage is put, first amplifier is transconductance type amplifier, and the output terminal of first amplifier passes through the 3rd capacitance connection to ginseng
Examine ground；The output of first amplifier is the output of the integrating circuit.
7. inductive current AC compounent reconstruction circuit according to claim 6, it is characterised in that：The bias set circuti
Including the second amplifier, first resistor, second resistance, 3rd resistor and the 4th capacitance,
The output of the integrating circuit is connected to the negative input end of second amplifier, first electricity by the first resistor
Pressure is connected to the positive input terminal of second amplifier,
When second amplifier is transconductance type amplifier, the output terminal of second amplifier passes through capacitance connection to reference ground；When
When second amplifier is voltage-type amplifier, the output terminal of second amplifier passes through the 4th capacitance connection to the second amplifier
Negative input end；
The output of second amplifier is connected to the positive input terminal of second amplifier by the second resistance；First fortune
The positive input terminal put is connected to the negative input end of first amplifier by the 3rd resistor.
8. inductive current AC compounent reconstruction circuit according to claim 1, it is characterised in that：The on-off circuit is four
Buckboost circuits are switched, it is described including first switch pipe, second switch pipe, the 3rd switching tube, the 4th switching tube and inductance
The common port of first switch pipe and second switch pipe series connection, the first switch pipe and the second switch pipe is opened for first
Artis, the first switch pipe are connected to input terminal, and the second switch pipe is connected to ground, the 3rd switching tube and described
4th switching tube is connected, and the common port of the 3rd switching tube and the 4th switching tube is second switch node, and the described 3rd
Switching tube is connected to output terminal, and the 4th switching tube is connected to ground, and the inductance connection is in the first switch node and institute
Between stating second switch node,
Second input terminal of the integrating circuit receives the signal for characterizing the second switch node voltage.
9. a kind of control circuit of on-off circuit, which is characterized in that including the inductance electricity as described in claim 1-8 any one
AC compounent reconstruction circuit, comparison circuit and logic circuit are flowed,
The switching node is connected to the input terminal of the inductive current AC compounent reconstruction circuit, and the comparison circuit receives institute
The output signal and first threshold of inductive current AC compounent reconstruction circuit are stated, and is compared, the logic circuit receives
The output signal of the comparison circuit, output switching signal control the turn-on and turn-off of switching tube in the on-off circuit.
10. a kind of on-off circuit, it is characterised in that：Including control circuit as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721448086.XU CN207459969U (en) | 2017-11-02 | 2017-11-02 | Inductive current AC compounent reconstruction circuit, control circuit and on-off circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721448086.XU CN207459969U (en) | 2017-11-02 | 2017-11-02 | Inductive current AC compounent reconstruction circuit, control circuit and on-off circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207459969U true CN207459969U (en) | 2018-06-05 |
Family
ID=62253510
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721448086.XU Withdrawn - After Issue CN207459969U (en) | 2017-11-02 | 2017-11-02 | Inductive current AC compounent reconstruction circuit, control circuit and on-off circuit |
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| Country | Link |
|---|---|
| CN (1) | CN207459969U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107769523A (en) * | 2017-11-02 | 2018-03-06 | 杰华特微电子（杭州）有限公司 | A kind of inductive current AC compounent reconstruction circuit, control circuit and on-off circuit |
-
2017
- 2017-11-02 CN CN201721448086.XU patent/CN207459969U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107769523A (en) * | 2017-11-02 | 2018-03-06 | 杰华特微电子（杭州）有限公司 | A kind of inductive current AC compounent reconstruction circuit, control circuit and on-off circuit |
| CN107769523B (en) * | 2017-11-02 | 2023-07-18 | 杰华特微电子股份有限公司 | Inductor current alternating current component reconstruction circuit, control circuit and switch 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 Inc.,Ltd. |
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