CN104319983B - A kind of source driving method, drive circuit and Switching Power Supply being used in Switching Power Supply - Google Patents
A kind of source driving method, drive circuit and Switching Power Supply being used in Switching Power Supply Download PDFInfo
- Publication number
- CN104319983B CN104319983B CN201410514912.0A CN201410514912A CN104319983B CN 104319983 B CN104319983 B CN 104319983B CN 201410514912 A CN201410514912 A CN 201410514912A CN 104319983 B CN104319983 B CN 104319983B
- Authority
- CN
- China
- Prior art keywords
- power supply
- main power
- tube
- transistor
- power tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electronic Switches (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of source driving method, drive circuit and Switching Power Supply being used in Switching Power Supply, pass through the control of ON-OFF control circuit main power tube and the switching sequence of transistor, it have adjusted the turn-on and turn-off time of main power tube and transistor, in the case where ensureing that source electrode drive circuit self-powered is met, solve inductive element current sample it is inaccurate the problem of, on the basis of circuit agent structure is not changed, the double requirements that the self-powered and current peak of source electrode drive circuit are accurately sampled are realized.
Description
Technical field
The present invention relates to field of switch power, more specifically to a kind of source drive side being used in Switching Power Supply
Method, drive circuit and Switching Power Supply.
Background technology
Source pole driving mode is widely used in Switching Power Supply due to its low power consumption high efficiency, and its cardinal principle is control
Being connected to the conducting of the transistor of main power tube source electrode makes the conducting of main power tube, passes through control and main power tube grid and source
The extremely conducting of switching tube in parallel is turned it off.
Moreover, source electrode drive circuit of the prior art is frequently with self-powered form, i.e., by by the electric energy of input
Power supply capacitor is charged, to produce the supply voltage of source electrode drive circuit, in source electrode drive circuit in the prior art, though
The problem of so meeting self-powered requirement, but do not consider to inductive element current sample in power stage circuit,
Some need the occasion sampled to inductive current peak, and it is not smart that source electrode drive circuit of the prior art has current sample
Really, and then the problem of cause to control inaccurate.
The content of the invention
In view of this, the invention provides a kind of source driving method, drive circuit and switch being used in Switching Power Supply
Power supply.By the control to transistor and the on off state of main power tube, the confession in source electrode drive circuit on the one hand can be ensured
Electricity, on the other hand can be achieved the accurate sampling to inductive element peak point current, solve output voltage or output current control not
Accurate the problem of.
According to a kind of source driving method being used in Switching Power Supply of the present invention, include a master in the Switching Power Supply
Power tube, the sampling resistor being sequentially connected in series between main power tube and ground and inductive element, power supply capacitor, the power supply capacitor
One end is connected to the points of common connection of the sampling resistor and inductive element, and the other end connects the source electrode drive circuit with to it
Operating voltage is provided, the main power tube is driven by source electrode drive circuit, the source electrode drive circuit includes being connected to
Transistor between the main power tube and sampling resistor,
In each switch periods, including,
In first time period, the main power tube and transistor is controlled to be both turned on, the electric current of the inductive element continues
Rise；
In second time period, the transistor is controlled to disconnect, the main power tube is held on, and the Switching Power Supply is defeated
The electric energy for entering end is charged by the main power tube to the power supply capacitor, within the time period, the electric current of the inductive element
Continue to rise；
Within the 3rd period, the transistor turns are controlled, the main power tube is held on, the inductive element
Electric current is kept rising, within the time period, and the peak point current of the inductive element is obtained by the sampling resistor；
Within the 4th period, the transistor is controlled to disconnect, the main power tube disconnects, the Switching Power Supply input
Electric energy the power supply capacitor is charged by the parasitic capacitance of the main power tube, until the parasitic capacitance both end voltage
It is equal to the both end voltage of the Switching Power Supply median generatrix electric capacity with the both end voltage sum of the transistor, charging process terminates；
Within the 5th period, the transistor is controlled to disconnect, the main power tube disconnects, the electricity in the inductive element
It can discharge to loading, until a switch periods are completed.
Further, the source electrode drive circuit also includes a switching tube, when the switching tube is turned on, the main power
Pipe is turned off；Also, the source electrode drive circuit controls the crystal according to a pwm control signal and charge-time control signal
The switch motion of pipe and switching tube.
Further, receive the non-signal of the pwm control signal and charge-time control signal, and by both carry out with
The first switch control signal is produced after logical operation, to control the switch motion of the transistor；
The pwm control signal is received, and carries out producing the second switch control signal after NOT logic computing, to control
The switch motion of the switching tube.
According to a kind of source electrode drive circuit being used in Switching Power Supply of the present invention, include a master in the Switching Power Supply
Power tube, the sampling resistor being sequentially connected in series between main power tube and ground and inductive element, power supply capacitor, the power supply capacitor
One end is connected to the points of common connection of the sampling resistor and inductive element, and the other end connects the source electrode drive circuit with to it
There is provided operating voltage, the main power tube is driven by source electrode drive circuit, the source electrode drive circuit include transistor,
First diode, the second diode, switching tube and ON-OFF control circuit,
The drain electrode end of the transistor is connected to the source terminal of the main power tube, and source terminal is connected to the sampling electricity
Resistance, the first diode and the second diode are sequentially connected in series between the source electrode and grid of the main power tube, and switching tube is simultaneously
Connection is connected to the two ends of the second diode；
The ON-OFF control circuit receives a pwm control signal and charge-time control signal, to produce first switch control
Signal and second switch control signal processed controls the switch motion of the transistor and switching tube；
Wherein, in each switch periods, including,
In first time period, the ON-OFF control circuit controls the transistor turns and controls the switching tube to break
Open, main power tube follows conducting, the electric current of the inductive element persistently rises；
In second time period, the ON-OFF control circuit controls the transistor to disconnect and controls the switching tube to keep
Disconnect, the main power tube is held on, the electric energy of the Switching Power Supply input is by the main power tube to the power supply
Electric capacity charges, within the time period, and the electric current of the inductive element continues to rise；
Within the 3rd period, the ON-OFF control circuit controls the transistor turns and controls the switching tube to keep
Disconnect, the main power tube is held on, the electric current of the inductive element keeps rising, and within the time period, is adopted by described
Sample resistance obtains the peak point current of the inductive element；
Within the 4th period, the ON-OFF control circuit controls the transistor to disconnect and control the switching tube to lead
Logical, the main power tube disconnects, and the electric energy of the Switching Power Supply input is by the parasitic capacitance of the main power tube to described
Power supply capacitor charges, until the both end voltage of the parasitic capacitance and the both end voltage sum of the transistor are equal to the switch
The both end voltage of power supply median generatrix electric capacity, charging process terminates；
Within the 5th period, the ON-OFF control circuit controls the transistor to disconnect and control the switching tube to lead
Logical, the main power tube is remained open, and the electric energy in the inductive element is discharged to load, until a switch periods are completed.
Further, the ON-OFF control circuit includes the first logic circuit and the second logic circuit,
First logic circuit receives the non-signal of the pwm control signal and charge-time control signal, and by two
Person is carried out with producing the first switch control signal after logical operation；
Second logic circuit receives the pwm control signal, and carries out producing described second after NOT logic computing and open
Close control signal.
It is preferred that, in second time period, the charge-time control signal is effective status.
It is preferred that, in charging interval of the charge-time control signal to control the power supply capacitor, opened in different
In the cycle of pass, the width of the effective status of the charge-time control signal can adjust.
According to a kind of Switching Power Supply of the present invention, including power stage circuit and power supply capacitor, the power stage circuit includes
One main power tube and the sampling resistor and inductive element being sequentially connected in series between main power tube and ground, in addition to above-mentioned source electrode drive
Dynamic circuit, the main power tube is driven by the source electrode drive circuit,
One end of the power supply capacitor is connected to the points of common connection of the sampling resistor and inductive element, other end connection
The source electrode drive circuit with give its provide operating voltage.
According to above-mentioned source driving method, drive circuit and Switching Power Supply, by opening transistor and main power tube
The control of off status, it is ensured that the self-powered requirement in source electrode drive circuit, also, by technical scheme, can be real
Now to the accurate sampling of the peak point current of inductive element (such as inductance), output voltage overcurrent protection and output constant current electric current are realized
The accurate control of size.
Brief description of the drawings
Figure 1A show a kind of schematic diagram of the Switching Power Supply of use source drive of prior art；
Figure 1B show a kind of working waveform figure of use source drive of prior art；
Fig. 2A show a kind of schematic diagram of the Switching Power Supply of use source drive according to the present invention；
Fig. 2 B show a kind of working waveform figure of use source drive according to the present invention；
Embodiment
Several preferred embodiments of the present invention are described in detail below in conjunction with accompanying drawing, but the present invention is not restricted to
These embodiments.The present invention covers any replacement, modification, equivalent method and side made in the spirit and scope of the present invention
Case.Thoroughly understand in order that the public has to the present invention, be described in detail in present invention below preferred embodiment specific thin
Section, and description without these details can also understand the present invention completely for a person skilled in the art.
As shown in Figure 1A, it is a kind of schematic diagram of the Switching Power Supply of use source drive in the prior art, switching tube Q1 is
Main power tube, source electrode drive circuit includes transistor Q2, diode D1, diode D2, switching tube S1 and ON-OFF control circuit
101, the drain electrode end of the transistor Q2 is connected to the source terminal of the main power tube Q1, and diode D1 and diode D2 go here and there successively
Connection is connected between the source electrode of the main power tube Q1 and grid, and switching tube S1 is connected in parallel between diode D2 two ends.
In addition, the Switching Power Supply also includes power supply capacitor Cvin, sampling resistor Rset, inductive element Lm, wherein, inductive element Lm can
To be the primary side winding of an independent inductance or transformer, here so that inverse-excitation type becomes the primary side winding in device as an example, sampling electricity
Resistance Rset and inductive element Lm is connected in series between transistor Q2 source electrode and ground, and the sampling resistor Rset is used for sample streams
The electric current of the inductive element Lm is crossed, one end of power supply capacitor is connected to the public of the sampling resistor Rset and inductive element Lm
Tie point, the other end connects the source electrode drive circuit to provide operating voltage for it.
Shown in switch motion of the ON-OFF control circuit 101 to control the transistor Q2 and switching tube S1, Figure 1A
A kind of implementation of the ON-OFF control circuit 101 of prior art, specifically, the ON-OFF control circuit receive PWM control letters
Number with controlling transistor Q2 switch motion, charge-time control signal and pwm control signal and progress and logical operation are received
Switch controlling signal V is produced afterwardsS1With controlling switch pipe S1 switch motion.
Further, the control oscillogram in the prior art to circuit shown in Figure 1A is shown with reference to Figure 1B, its is worked
Cheng Wei：At the t1 moment, pwm control signal is effective status (high level), transistor Q2 conductings, main power tube Q1 source voltage
It is pulled low, and because main power tube Q1 grid voltage is to be approximately equal to power supply capacitor CvinVoltage, therefore, the main power
Pipe Q1 gate source voltage is more than gate source voltage V in its on state threshold voltage, i.e. Figure 1BGS(Q1)For effective status (high level), main work(
Rate pipe Q1 is turned on, and the electric energy of input is charged by main power tube Q1, transistor Q2 to inductive element Lm, the inductive element Lm
Electric current ILMRamp, (the t within t1-t2 periodON), inductive element Lm electric current ILMIt is lasting to rise, until during t2
Carve, pwm control signal is changed into disarmed state (low level), transistor Q2 shut-offs, the main power tube Q1Source voltage start
Rise, (V in such as Figure 1B now, is held off due to switching tube S1S1For low level disarmed state), therefore, the main power tube
Grid source between parasitic capacitance CgsDischarge loop can not be produced, the gate source voltage of the main power tube is still greater than its conduction threshold electricity
Pressure, main power tube Q1 is held on, and the electric energy of input gives power supply capacitor C by main power tube Q1, diode D1vinCharging, from
(the t within t2 to t3 period is can be seen that in Figure 1Acharge), to the charging current of power supply capacitor yet by inductive element
Lm, the electric current I of the inductive element LmLMContinue to rise, in the process, the electric current for flowing through diode D1 also rises, its size
With the rate of rise and inductive element Lm electric current ILMIt is identical, see such as the electric current I in 1BD1, it is necessary to explanation, in the process,
The charging current of power supply capacitor and without flow through sampling resistor Rset, therefore, the sign inductive element that now sampling resistor is sampled
Peak current level and actual existing larger error.
Until the t3 moment, when charging between tchargeDuring arrival, switch controlling signal VS1It is changed into high level effective status, opens
Close pipe S1 conducting, main power tube Q1 shut-offs, the parasitic capacitance C between the drain-source that the electric energy of input passes through main power tubeds, diode
D1 continues to give power supply capacitor CvinThe t3-t4 periods in charging, such as Figure 1B, but because parasitic capacitance Cds capacitance is smaller, because
This, charging current during this is varied less, at this moment the electric current I on inductanceLMIt is believed that holding is constant, node LX and node
Voltage between ISET is begun to ramp up, and to the t4 moment, parasitic capacitance Cds chargings terminate, now, between node LX and node ISET
Voltage be equal to CbusBoth end voltage, main power tube Q1 switch periods enter stage turn-off time, during this period of time, such as work(
Rate level circuit is inverse-excitation type switch power-supply, then is secondary discharge regime, also, after the period that electric discharge starts, switching tube
S1 is changed into shut-off from turning on, and afterwards, to the t5 moment, electric discharge terminates, after delay a period of time is interval, to the t6 moment, and one new
Cycle, pwm control signal is changed into high level effective status, and the above-mentioned course of work is repeated again.
In above process as can be seen that in the control logic and the course of work of existing source electrode drive circuit, although
The self-powered problem of power supply capacitor can be met, it is apparent that, the control chip of system can not be accurately detected perceptual power LM
Peak point current, find out from Figure 1B, the inductive element current peak that control chip can be detected is perceptual at the t2 moment, and actually
Element electric current in t2 to t3 periods still has larger uphill process, and this causes signal feedback control loop for signal in circuit
Control it is inaccurate, for Switching Power Supply, when can cause the constant pressure to export over-current protection point or during constant current output to output
The control of electric current is inaccurate.
Therefore, on the basis of inventor thinks deeply herein, by the improvement to ON-OFF control circuit, the core of the present invention is obtained
Thought, i.e., obtain the peak point current of accurate inductive element by controlling transistor Q2 and main power tube Q1 on off state,
On the basis of circuit agent structure is not changed, the requirement that the self-powered and peak point current of power supply capacitor are accurately sampled is realized.
With reference to Fig. 2A, the schematic diagram of the Switching Power Supply according to a kind of source drive of the invention is shown, of the invention real
Apply in example, the power stage circuit of the Switching Power Supply with it is identical in the prior art, directly quote in embodiments of the present invention corresponding
Mark, does not repeat to illustrate that device is constituted and annexation herein, ON-OFF control circuit 201 includes anti-phase by first in the present invention
Device and the first the first logic circuit constituted with door and the second logic circuit being made up of the second phase inverter, wherein, described first
Phase inverter receives charge-time control signal tchargeThe first input end to first and door, described are transmitted after inverted processing
One receives pwm control signal with the second input of door, through with exporting first switch control signal V after logical operationGS(Q2), the
Two phase inverters receive output second switch control signal V after the inverted processing of pwm control signalS1, here, it should be noted that institute
State charge-time control signal tchargeTo control the power supply capacitor CvinCharging interval, in different switch periods,
The width of the effective status of the charge-time control signal can adjust.
This is described in detail below with reference to a kind of working waveform figure of use source drive of the foundation present invention shown in Fig. 2 B
The course of work of embodiment：When a switch periods start time, i.e. t1 moment, the pwm control signal is changed into effective status
(represent effective status here with high level, low level represents disarmed state, below all same) is due to charge-time control signal
tchargeFor low level disarmed state, therefore, the first switch control signal VGS(Q2)For high level effective status, the crystal
Pipe Q2 is turned on, and main power tube Q1 source voltage is pulled low, and because main power tube Q1 grid voltage is to be approximately equal to power supply
Electric capacity CvinVoltage, therefore, the gate source voltage of the main power tube Q1 is more than its on state threshold voltage, main power tube Q1 conductings,
The electric energy of input is charged by main power tube Q1, transistor Q2 to inductive element Lm, the electric current I of the inductive element LmLMDirectly
Line rises, (the i.e. first time period t within t1-t2 periodCH1), inductive element Lm electric current ILMIt is lasting to rise.
Afterwards, to the t2 moment, charge-time control signal tchargeIt is changed into high level effective status, at this moment described first opens
Close control signal VGS(Q2)For low level disarmed state, the transistor Q2 shut-offs, the main power tube Q1Source voltage start
Rise, now, because pwm control signal remains high level state, therefore, second switch control signal VS1Remain low level
Disarmed state, switching tube S1 is held off (as shown in Figure 2 B), therefore, the parasitic capacitance C between the grid source of the main power tubegsNo
Discharge loop can be produced, the gate source voltage of the main power tube is still greater than its on state threshold voltage, and main power tube Q1 is held on,
The electric energy of input gives power supply capacitor C by main power tube Q1, diode D1vinCharging, from Fig. 2A as can be seen that t2 to
(i.e. second time period t in t3 periodcharge), to the charging current of power supply capacitor yet by inductive element Lm, the perception
Element Lm electric current ILMContinue to rise, in the process, the electric current for flowing through diode D1 also rises, its size and the rate of rise with
Inductive element Lm electric current ILMIt is identical, the electric current I in such as Fig. 2 BD1。
Then, at the t3 moment, the charge-time control signal tchargeIt is changed into low level effective status, described again
One switch controlling signal VGS(Q2)Again it is changed into high level effective status, the transistor Q2 is turned on, and at this moment, due to switching tube
S1 is held off, therefore main power tube Q1 is remained on, and the electric energy of input gives perception by main power tube Q1, transistor Q2
Element Lm charges, the electric current I of the inductive element LmLMKeep rising.Obvious, within t3 to t4 period (when the i.e. the 3rd
Between section tCH2), the electric current of inductive element is by the sampling resistor Rset, in the process, and the control chip of system passes through described
Sampling resistor can obtain the peak current level of inductive element.
Then, to the t4 moment, the pwm control signal is changed into low level disarmed state, the first switch control signal
VGS(Q2)It is changed into low level disarmed state, the transistor Q2 shut-offs；The second switch control signal VS1It is changed into high level effective
State, switching tube S1 conducting, therefore, the main power tube Q1 shut-offs, the leakage that the electric energy of input passes through main power tube Q1
Parasitic capacitance C between sourceds, diode D1 continues to give power supply capacitor CvinThe t4-t5 periods in charging, such as Fig. 2 B are (when the i.e. the 4th
Between section tCH4), but due to parasitic capacitance CdsCapacitance it is smaller, therefore, varying less for charging current during this is at this moment electric
Electric current I in senseLMIt is believed that holding is constant, the voltage between node LX and node ISET is begun to ramp up, until the t5 moment is arrived, institute
State the both end voltage of parasitic capacitance and be equal to the two of the Switching Power Supply median generatrix electric capacity with the both end voltage sum of the transistor
Terminal voltage, parasitic capacitance CdsCharging terminates, at this moment, the voltage V between node LX and node ISETLX-ISETRise to and switch electricity
The voltage V of the input in sourceINIt is equal.
Finally, after the t5 moment, switch periods enter stage turn-off time, during this period of time, such as power stage circuit
Then it is secondary discharge regime for inverse-excitation type switch power-supply, to the t6 moment, electric discharge is completed, in (i.e. the 5th time t5-t6 periods
Section toff), the electric energy in the inductive element is discharged to load, until a switch periods are completed.Delay a period of time is interval
Afterwards, to the t7 moment, a new cycle, pwm control signal is changed into high level effective status, repeats above-mentioned worked again
Journey.
Herein it is to be understood that the pwm control signal and charge-time control signal in the embodiment of the present invention are with showing
The effective width for having two signals of technology is to differ, what it was mainly designed according to the difference of control principle, for example,
In the embodiment of the present invention, pwm control signal is the control impulse waveform precomputed, charge-time control signal tchargeFor
According to the default impulse waveform of circuit charging requirement, also, described, charge-time control signal tchargeIn different switch weeks
It is interim, can automatic adjusument as needed.
From said process as can be seen that the embodiment of the present invention can obtain the peak point current of inductive element at the t4 moment, its
With actual size closely, it can only obtain inductive element to the peak current level of acquisition with prior art at the t3 moment
Peak point current is compared, and its control is accurately greatly promoted, and in the case where to required precision not being very high, can obtain constant pressure defeated
Over-current protection point and output current is accurately controlled during constant current output when going out.
In addition, in the case of very high to the requirement of the signal accuracy of Switching Power Supply, in the present invention in the 4th period
The curent change of inductive element can be compensated according to the method for calculating, for example, due to parasitic capacitance CdsCapacitance can root
According to gain of parameter, bus capacitor CbusBoth end voltage it is recognised that therefore can according to electric capacity charge formula obtain inductive element
The size of curent change, you can to obtain the size of current of inductive element, due to the peak point current obtained at the t4 moment, inner core
Piece can be compensated according to the curent change size of calculating to the peak current level of detection, to obtain more accurate inductance
Current peak signal.
In summary, by the source electrode drive circuit being applied in Switching Power Supply of the present invention, by switch control letter
Number sequential control, have adjusted the turn-on and turn-off time of main power tube and transistor, ensure source electrode drive circuit confession
In the case that electricity is met, the problem of inductive element sampling is inaccurate is solved, it is real on the basis of circuit agent structure is not changed
The double requirements that the self-powered and current peak of existing source electrode drive circuit are accurately sampled.
The embodiment of the invention also discloses a kind of source driving method being applied in Switching Power Supply, in the Switching Power Supply
Include a main power tube, the sampling resistor being sequentially connected in series between main power tube and ground and inductive element, power supply capacitor, it is described
One end of power supply capacitor is connected to the points of common connection of the sampling resistor and inductive element, and the other end connects the source drive
Circuit to it to provide operating voltage, and the main power tube is driven by source electrode drive circuit, the source electrode drive circuit
Including the transistor being connected between the main power tube and sampling resistor, in each switch periods, including,
In first time period, the main power tube and transistor is controlled to be both turned on, the electric current of the inductive element continues
Rise；
In second time period, the transistor is controlled to disconnect, the main power tube is held on, and the Switching Power Supply is defeated
The electric energy for entering end is charged by the main power tube to the power supply capacitor, within the time period, the electric current of the inductive element
Continue to rise；
Within the 3rd period, the transistor turns are controlled, the main power tube is held on, the inductive element
Electric current is kept rising, within the time period, and the peak point current of the inductive element is obtained by the sampling resistor；
Within the 4th period, the transistor is controlled to disconnect, the main power tube disconnects, the Switching Power Supply input
Electric energy the power supply capacitor is charged by the parasitic capacitance of the main power tube, until the parasitic capacitance both end voltage
Equal to the both end voltage of the Switching Power Supply median generatrix electric capacity, charging process terminates；
Within the 5th period, the transistor is controlled to disconnect, the main power tube disconnects, the electricity in the inductive element
It can discharge to loading, until a switch periods are completed.
Finally, the embodiment of the invention also discloses a kind of Switching Power Supply, the Switching Power Supply includes power stage circuit and confession
Electric capacity, the power stage circuit includes a main power tube and the sampling resistor being sequentially connected in series between main power tube and ground and sense
Property element, in addition to above-mentioned source electrode drive circuit, the main power tube is driven by the source electrode drive circuit, described
One end of power supply capacitor is connected to the points of common connection of the sampling resistor and inductive element, and the other end connects the source drive
Circuit with give its provide operating voltage.
Further, the power stage circuit is reverse exciting topological structure, positive activation type topological structure or buck topology knot
Structure, boost type topological structure, step-down/up type topological structure, CUK topological structures, zeta topological structures, Sepic topological structures.
Similarly, self-powered and peak point current of the Switching Power Supply equally with above-mentioned source electrode drive circuit are accurately adopted
The beneficial effect of sample.
Above to the source electrode drive circuit being applied in Switching Power Supply, the driving method according to the preferred embodiments of the present invention
And Switching Power Supply has carried out detailed description, those of ordinary skill in the art can deduce other technologies or structure and electricity accordingly
Road layout, element etc. can be applied to the embodiment.
According to embodiments of the invention as described above, these embodiments do not have all details of detailed descriptionthe, not yet
It is only described specific embodiment to limit the invention.Obviously, as described above, it can make many modifications and variations.This explanation
Book is chosen and specifically describes these embodiments, is in order to preferably explain the principle and practical application of the present invention, so that affiliated
Technical field technical staff can be used using modification of the invention and on the basis of the present invention well.The present invention is only by right
The limitation of claim and its four corner and equivalent.
Claims (5)
1. include a main power tube in a kind of source driving method being used in Switching Power Supply, the Switching Power Supply, go here and there successively
The sampling resistor and inductive element that are associated between main power tube and ground, power supply capacitor, one end of the power supply capacitor is connected to institute
The points of common connection of sampling resistor and inductive element is stated, the other end connects source electrode drive circuit to provide operating voltage, institute to it
State main power tube to be driven by source electrode drive circuit, it is characterised in that the source electrode drive circuit is described including being connected to
Transistor between main power tube and sampling resistor,
In each switch periods, including,
In first time period, the main power tube and transistor is controlled to be both turned on, the electric current of the inductive element persistently rises；
In second time period, the transistor is controlled to disconnect, the main power tube is held on, the Switching Power Supply input
Electric energy the power supply capacitor is charged by the main power tube, within the time period, the electric current of the inductive element continues
Rise；
Within the 3rd period, the transistor turns are controlled, the main power tube is held on, the electric current of the inductive element
Keep rising, within the time period, the peak point current of the inductive element is obtained by the sampling resistor；
Within the 4th period, the transistor is controlled to disconnect, the main power tube disconnects, the electricity of the Switching Power Supply input
The power supply capacitor can be charged by the parasitic capacitance of the main power tube, until both end voltage and the institute of the parasitic capacitance
The both end voltage sum for stating transistor is equal to the both end voltage of the Switching Power Supply median generatrix electric capacity, and charging process terminates；
Within the 5th period, the transistor is controlled to disconnect, the main power tube disconnects, the electric energy in the inductive element is released
Put to load, until a switch periods are completed；
The source electrode drive circuit also includes a switching tube, when the switching tube is turned on, the main power tube shut-off；
Also, the source electrode drive circuit controls the transistor according to a pwm control signal and charge-time control signal
With the switch motion of switching tube；
The non-signal of the pwm control signal and charge-time control signal is received, and both are carried out with being produced after logical operation
Raw first switch control signal, to control the switch motion of the transistor；
The pwm control signal is received, and carries out producing second switch control signal after NOT logic computing, to control the switch
The switch motion of pipe.
2. include a main power tube in a kind of source electrode drive circuit being used in Switching Power Supply, the Switching Power Supply, go here and there successively
The sampling resistor and inductive element that are associated between main power tube and ground, power supply capacitor, one end of the power supply capacitor is connected to institute
The points of common connection of sampling resistor and inductive element is stated, the other end connects the source electrode drive circuit to provide work electricity to it
Pressure, the main power tube is driven by source electrode drive circuit, it is characterised in that the source electrode drive circuit includes crystal
Pipe, the first diode, the second diode, switching tube and ON-OFF control circuit,
The drain electrode end of the transistor is connected to the source terminal of the main power tube, and source terminal is connected to the sampling resistor, the
One diode and the second diode are sequentially connected in series between the source electrode and grid of the main power tube, paralleled power switches connection
At the two ends of the second diode；
The ON-OFF control circuit receives a pwm control signal and charge-time control signal, to produce first switch control letter
Number and second switch control signal control the switch motion of the transistor and switching tube；
Wherein, in each switch periods, including,
In first time period, the ON-OFF control circuit controls the transistor turns and controls the switching tube to disconnect, main
Power tube follows conducting, and the electric current of the inductive element persistently rises；
In second time period, the ON-OFF control circuit controls the transistor to disconnect and controls the switching tube to keep disconnected
Open, the main power tube is held on, the electric energy of the Switching Power Supply input is electric to the power supply by the main power tube
Capacity charge, within the time period, the electric current of the inductive element continue to rise；
Within the 3rd period, the ON-OFF control circuit controls the transistor turns and controls the switching tube to keep disconnected
Open, the main power tube is held on, the electric current of the inductive element keeps rising, and within the time period, passes through the sampling
Resistance obtains the peak point current of the inductive element；
Within the 4th period, the ON-OFF control circuit controls the transistor to disconnect and controls the switching tube to turn on, institute
Main power tube disconnection is stated, the electric energy of the Switching Power Supply input is electric to the power supply by the parasitic capacitance of the main power tube
Capacity charge, until the both end voltage of the parasitic capacitance and the both end voltage sum of the transistor are equal in the Switching Power Supply
The both end voltage of bus capacitor, charging process terminates；
Within the 5th period, the ON-OFF control circuit controls the transistor to disconnect and controls the switching tube to turn on, institute
State main power tube to remain open, the electric energy in the inductive element is discharged to load, until a switch periods are completed；
The ON-OFF control circuit includes the first logic circuit and the second logic circuit,
First logic circuit receives the non-signal of the pwm control signal and charge-time control signal, and both are entered
Row after logical operation with producing the first switch control signal；
Second logic circuit receives the pwm control signal, and carries out producing the second switch control after NOT logic computing
Signal processed.
3. source electrode drive circuit according to claim 2, it is characterised in that in second time period, the charging interval
Control signal is effective status.
4. source electrode drive circuit according to claim 3, it is characterised in that the charge-time control signal is to control
The charging interval of the power supply capacitor, in different switch periods, the width of the effective status of the charge-time control signal
Degree is adjustable.
5. a kind of Switching Power Supply, including power stage circuit and power supply capacitor, the power stage circuit include a main power tube and according to
The secondary sampling resistor and inductive element being connected between main power tube and ground, it is characterised in that also any including claim 2-4
Described source electrode drive circuit,
The main power tube is driven by the source electrode drive circuit,
One end of the power supply capacitor is connected to the points of common connection of the sampling resistor and inductive element, and other end connection is described
Source electrode drive circuit with give its provide operating voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410514912.0A CN104319983B (en) | 2014-09-29 | 2014-09-29 | A kind of source driving method, drive circuit and Switching Power Supply being used in Switching Power Supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410514912.0A CN104319983B (en) | 2014-09-29 | 2014-09-29 | A kind of source driving method, drive circuit and Switching Power Supply being used in Switching Power Supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104319983A CN104319983A (en) | 2015-01-28 |
| CN104319983B true CN104319983B (en) | 2017-09-29 |
Family
ID=52375182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410514912.0A Active CN104319983B (en) | 2014-09-29 | 2014-09-29 | A kind of source driving method, drive circuit and Switching Power Supply being used in Switching Power Supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104319983B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105871192A (en) * | 2016-04-22 | 2016-08-17 | 上海晶丰明源半导体有限公司 | Power supply circuit, control chip, switch power supply system and power supply method |
| CN106230238B (en) * | 2016-08-11 | 2018-10-30 | 昂宝电子（上海）有限公司 | Control device and switch power supply system for switch power supply system |
| CN106954123B (en) * | 2017-02-24 | 2020-05-12 | 昂宝电子（上海）有限公司 | Power tube driving system and method |
| CN107272807B (en) * | 2017-08-07 | 2019-07-09 | 矽力杰半导体技术(杭州)有限公司 | Self-powered source electrode drive circuit, source drive switch converters and integrated circuit |
| CN107612107A (en) * | 2017-08-23 | 2018-01-19 | 成都芯源系统有限公司 | Power supply voltage generating circuit and integrated circuit thereof |
| CN108599561B (en) * | 2018-06-04 | 2020-07-10 | 武汉上水微电子科技有限公司 | Method for supplying power to chip power supply by using triode storage time |
| CN113541444B (en) * | 2020-04-15 | 2023-03-24 | 成都中启易联科技有限公司 | Current recovery circuit, switch converter and integrated circuit |
| CN112557945A (en) * | 2020-11-18 | 2021-03-26 | 苏州美思迪赛半导体技术有限公司 | Drive port state detection circuit and method |
| CN112379204B (en) * | 2020-11-18 | 2024-03-29 | 苏州美思迪赛半导体技术有限公司 | Driving port state detection circuit and method of driving circuit |
| CN113872428B (en) * | 2021-12-01 | 2022-02-25 | 珠海智融科技股份有限公司 | Drive control circuit, method, equipment and medium of gallium nitride transistor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101350558A (en) * | 2007-04-23 | 2009-01-21 | 技领半导体(上海)有限公司 | Constant current and voltage controller in a four-pin package with dual-use pin ane method thereof |
| CN102638165A (en) * | 2012-03-31 | 2012-08-15 | 深圳市博驰信电子有限责任公司 | Power compensation circuit and power supply chip of switching power supply |
| CN102832792A (en) * | 2012-08-24 | 2012-12-19 | 矽力杰半导体技术(杭州)有限公司 | Source electrode driving control circuit and control method thereof |
| CN103424602A (en) * | 2013-09-02 | 2013-12-04 | 南京埃科孚电子科技有限公司 | Secondary winding current detection circuit based on source electrode drive |
| CN103825469A (en) * | 2014-03-06 | 2014-05-28 | 矽力杰半导体技术(杭州)有限公司 | Control circuit for isolated type convertor and isolated type convertor |
-
2014
- 2014-09-29 CN CN201410514912.0A patent/CN104319983B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101350558A (en) * | 2007-04-23 | 2009-01-21 | 技领半导体(上海)有限公司 | Constant current and voltage controller in a four-pin package with dual-use pin ane method thereof |
| CN102638165A (en) * | 2012-03-31 | 2012-08-15 | 深圳市博驰信电子有限责任公司 | Power compensation circuit and power supply chip of switching power supply |
| CN102832792A (en) * | 2012-08-24 | 2012-12-19 | 矽力杰半导体技术(杭州)有限公司 | Source electrode driving control circuit and control method thereof |
| CN103424602A (en) * | 2013-09-02 | 2013-12-04 | 南京埃科孚电子科技有限公司 | Secondary winding current detection circuit based on source electrode drive |
| CN103825469A (en) * | 2014-03-06 | 2014-05-28 | 矽力杰半导体技术(杭州)有限公司 | Control circuit for isolated type convertor and isolated type convertor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104319983A (en) | 2015-01-28 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104319983B (en) | A kind of source driving method, drive circuit and Switching Power Supply being used in Switching Power Supply | |
| CN205725436U (en) | Gate driver circuit and include the bridge circuit of gate driver circuit | |
| CN102969889B (en) | A kind of self-powered source electrode drive circuit and apply its Switching Power Supply | |
| CN104410252B (en) | Source electrode drive circuit and its control method | |
| CN101267156B (en) | Separation driving circuit with discharging channel | |
| CN103825469B (en) | For control circuit and the isolated converter of isolated converter | |
| CN104052307B (en) | A kind of bridge type modular multi-level two-way switch electric capacity AC-AC Conversion device | |
| CN203859683U (en) | Synchronous rectification drive circuit | |
| CN105515377A (en) | Soft switch high gain direct current converter based on coupling inductances and voltage doubling capacitors | |
| CN104779790A (en) | Switched inductance quasi-Z source DC-DC converter circuit | |
| CN102684462A (en) | Novel low end metal oxide semiconductor field effect transistor (MOSFET)/ insulated gate bipolar transistor (IGBT) negative pressure clamping driving circuit and control method thereof | |
| CN204442176U (en) | A kind of switched inductors type accurate Z source DC-DC converter circuit | |
| CN103049028B (en) | Constant current source for high voltage magnetic switch resetting | |
| CN103825457A (en) | Quasi-Z-source DC-DC boost converter circuit | |
| CN104009633A (en) | Current continuous type high-gain DC-DC converter circuit | |
| CN105553259B (en) | self-powered control circuit, control method and switching circuit | |
| CN101952786A (en) | SEPIC feed-in step-down controller | |
| CN202696454U (en) | Gate drive circuit | |
| CN107742971A (en) | A kind of drive circuit and switching power circuit | |
| CN104023445B (en) | A kind of LED drive circuit | |
| CN104393755A (en) | High-efficiency booster circuit | |
| CN102123553B (en) | COT mode LED lighting driving circuit | |
| CN107272807A (en) | Self-powered source electrode drive circuit, source drive switch converters and integrated circuit | |
| CN107482921A (en) | A kind of two-way DC DC converters | |
| CN102340237B (en) | Driving circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: 310051 No. 6 Lianhui Street, Xixing Street, Binjiang District, Hangzhou City, Zhejiang Province Patentee after: Silergy Semiconductor Technology (Hangzhou ) Co., Ltd. Address before: 310012 Xihu District, Hangzhou, Wensanlu Road, No. 90, East Software Park, science and technology building, A1501 Patentee before: Silergy Semiconductor Technology (Hangzhou ) Co., Ltd. |