CN206727872U - A kind of Switching Power Supply high precision peak current circuit, control circuit and adjustment circuit - Google Patents
A kind of Switching Power Supply high precision peak current circuit, control circuit and adjustment circuit Download PDFInfo
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- CN206727872U CN206727872U CN201720304525.3U CN201720304525U CN206727872U CN 206727872 U CN206727872 U CN 206727872U CN 201720304525 U CN201720304525 U CN 201720304525U CN 206727872 U CN206727872 U CN 206727872U
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Abstract
The utility model discloses a kind of Switching Power Supply high precision peak current circuit, the current circuit includes：Inductance coil (L), power tube (M), sampling resistor (R) and detection control circuit (10)；The inductance coil (L), power tube (M), sampling resistor (R) are sequentially connected, sampling resistor (R) is grounded, the input of detection control circuit (10) is connected to power tube (M) output end, and the output end of detection control circuit (10) is connected to power tube (M) control terminal.The inductance coil (L) can be primary side inductance coil.The invention also discloses a kind of Switching Power Supply high precision peak control circuit, adjustment circuit.The utility model realizes the high-precision control to Switching Power Supply peak point current, improves power supply precision.
Description
Technical field
Switch power technology field is the utility model is related to, more particularly to a kind of Switching Power Supply high precision peak electric current electricity
Road, control circuit and adjustment circuit.
Background technology
The application of Switching Power Supply is increasingly extensive at present, whether AC-DC/DC-DC power supplys, to power supply main control chip precision
It is required that also more and more higher.Switching Power Supply generally includes a switching device and ON-OFF control circuit, coordinates inductance, electric capacity, switch
Pipe, sampling resistor etc., according to different applicable cases, different elements is selected to build peripheral topology according to different annexations
Structure, its basic control principle is same or like, is all to feed back to output quantity or input quantity in ON-OFF control circuit, according to defeated
The dutycycle of the change adjusting switch device of output or input quantity.The output quantity and input quantity, refer to defeated when system works
Enter the parameters such as voltage, input current, output voltage, output current.
A kind of common control mode is that the electric current of inductance and switching device is sampled, and is fed back in control loop,
The dutycycle of adjusting switch device.Realize that the control circuit of this regulative mode generally includes power tube current sample circuit, work(
Rate tube drive circuit, comparison circuit etc., comparison circuit set the current signal that power tube current sample circuit collects and one
Fixed current value is compared, and obtains comparative result, and drive circuit exports different duty according to the comparative result of comparison circuit
Square wave driving power pipe work.
In the ideal situation, after inductive current flows through the power tube of conducting, sampled resistance will reflect power tube current
Voltage is transferred to the Ics ports that governor circuit is used for receiving power tube current sampled signal, when Ics Port detectings to threshold voltage
After Vset, power tube shut-off is controlled at once, and inductance peak point current is determined by equation below：
Iset=Vset/Rcs=(Vin/Lp) × Ton
In real work, after Ics Port detectings to threshold voltage Vset, internal control signal switch-off power pipe is present
Time delay, the time delay are caused by many factors, such as the drive circuit delay for driving power pipe switch and signal
Delay etc. caused by parasitic factor in transmitting procedure；Thus actual inductance peak point current is determined by following formula：
Ipeak=(Vin/Lp) × (Ton+Td)=(Vin/Lp) × Ton+ (Vin/Lp) × Td=Iset+ Δs I
Wherein：
Vset：The threshold voltage for being used to control inductance peak point current of chip internal setting；
Iset：The inductance peak current value of setting；
Vin：Inductance input voltage；
Lp：Inductance inductance value；
Ton：Power tube begins to turn on Ics port voltages and reaches time corresponding to Vset voltages；
Td：After Ics port voltages reach Vset, from the time delay for sending control signals to switch-off power pipe；
Ipeak：Actual inductance peak current value；
ΔI：The current error value caused by time delay Td.
From formula as can be seen that actual inductance peak point current changes with Lp, Vin, Td change, prior art one
As above-mentioned change is compensated using two ways：One kind, which is utilized on threshold voltage Vset, is superimposed one with the Ton times
The ramp voltage of the fixed slope of change, Lp, Vin excursion are very big during practical application, the compensation side of this fixed slope
Formula, it can not be made a change accordingly in the case of different Lp, Vin, it is difficult to realize optimal compensation and accurate control；One kind is
Using the external resistance of a chip pin to Vin, Vset magnitudes of voltage are compensated by sampling different Vin magnitudes of voltage, this
Scheme adds chip pin so as to add cost, and when Vin magnitudes of voltage belong to high pressure, it is necessary to which high tension apparatus is adopted
Sample, further increase circuit cost.Prior art can not make adaptive adjustment according to Lp, Vin, Td change, and postpone
Time Td by switching device in itself, ON-OFF control circuit determine, and a range of fluctuation had during Vin differences, thus Δ I
It can not accurately be controlled, also accurately Ipeak cannot be controlled.
Utility model content
For problems of the prior art, the utility model proposes a kind of Switching Power Supply high precision peak electric current electricity
Road, the current circuit include：Inductance coil (L), power tube (M), sampling resistor (R) and detection control circuit (10)；
The inductance coil (L), power tube (M), sampling resistor (R) are sequentially connected, sampling resistor (R) ground connection, detection control
The input of circuit (10) processed is connected to power tube (M) output end, and the output end of detection control circuit (10) is connected to power
Manage the control terminal of (M)；The inductance coil (L) can be primary side inductance coil；
The detection control circuit (10) includes sample circuit (20), compares initialization circuit (30), preset value circuit (40)
With comparison circuit (A)；Sample circuit (20) is connected to the second input of comparison circuit (A) and the output end of power tube (M), than
Compared with the first input end that initialization circuit (30) is connected to sample circuit (20), preset value circuit (40) and comparison circuit (A).
Wherein, the relatively initialization circuit (30) includes the first comparison circuit (P1), the second comparison circuit (P2) and setting
The input of adjustment circuit (31), the first comparison circuit (P1) and the second comparison circuit (P2) is connected with sample circuit (20), the
The output end connection setting adjustment circuit (31) of one comparison circuit (P1), the second comparison circuit (P2).
Wherein, an input of an input of first comparison circuit (P1) and the second comparison circuit (P2) with
Sample circuit (20) connects, and the first of another input connection preset value circuit of first comparison circuit (P1) is pre-
If being worth output end, the second preset value of another input connection preset value circuit of second comparison circuit (P2) is defeated
Go out end.
Wherein, the output end of comparison circuit (A) is connected to power tube (M) control terminal.
Wherein, the detection control circuit (10) is control chip.
A kind of Switching Power Supply high precision peak current detection control circuit, including sample circuit (20), compare initialization circuit
(30), preset value circuit (40) and comparison circuit (A)；Sample circuit (20) is connected to the second input of comparison circuit (A), than
Compared with the first input end that initialization circuit (30) is connected to sample circuit (20), preset value circuit (40) and comparison circuit (A).
Wherein, the relatively initialization circuit (30) includes the first comparison circuit (P1), the second comparison circuit (P2) and setting
Adjustment circuit (31), an input of first comparison circuit (P1) and an input of the second comparison circuit (P2) with
Sample circuit (20) connects, and the first of another input connection preset value circuit of first comparison circuit (P1) is pre-
If being worth output end, the second preset value of another input connection preset value circuit of second comparison circuit (P2) is defeated
Go out end.
Wherein, the detection control circuit is control chip.
A kind of Switching Power Supply peak point current adjustment circuit, including sample circuit (20), compare initialization circuit (30) and default
It is worth circuit (40)；Initialization circuit (30) is connected compared with respectively for the sample circuit (20) and the preset value circuit (40)；Institute
State and compare initialization circuit (30) including the first comparison circuit (P1), the second comparison circuit (P2) and set adjustment circuit (31), the
The input of one comparison circuit (P1) and the second comparison circuit (P2) is connected with sample circuit (20), the first comparison circuit (P1),
The output end connection setting adjustment circuit (31) of second comparison circuit (P2).
Wherein, an input of an input of first comparison circuit (P1) and the second comparison circuit (P2) with
Sample circuit (20) connects, and the first of another input connection preset value circuit of first comparison circuit (P1) is pre-
If being worth output end, the second preset value of another input connection preset value circuit of second comparison circuit (P2) is defeated
Go out end.
The utility model realizes the high-precision control to Switching Power Supply peak point current, improves power supply precision.
Brief description of the drawings
Fig. 1 is a kind of Switching Power Supply high precision peak current circuit of the present utility model；
Fig. 2 is the comparison initialization circuit (30) in a kind of Switching Power Supply high precision peak current circuit of the present utility model
Structural representation；
Fig. 3 is a kind of Switching Power Supply high precision peak current detection control circuit of the present utility model；
A kind of Fig. 4 Switching Power Supply high precision peak matrix current adjustment circuits of the present utility model；
Fig. 5 is a kind of Switching Power Supply high precision peak current control method of the present utility model.
Embodiment
The utility model is elaborated below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of Switching Power Supply high precision peak current circuit of the present utility model, including：Inductance coil
(L), power tube (M), sampling resistor (R) and detection control circuit (10).The inductance coil (L), power tube (M), sampling electricity
Resistance (R) is sequentially connected, and sampling resistor (R) ground connection, the input of detection control circuit (10) is connected to power tube (M) output
End, the output end of detection control circuit (10) are connected to power tube (M) control terminal.The inductance coil (L) can be primary side
Inductance coil.
The detection control circuit (10) includes sample circuit (20), compares initialization circuit (30), preset value circuit (40)
With comparison circuit (A).Sample circuit (20) is connected to the second input of comparison circuit (A) and the output end of power tube (M), than
Compared with the first input end of initialization circuit (30) connection sample circuit (20), preset value circuit (40) and comparison circuit (A).Compare electric
The output end on road (A) is connected to power tube (M) control terminal.Preferably, the detection control circuit is control chip.
The sample circuit (20) is used for the peak I csmax for detecting electric current Ics and sample rate current Ics；
The relatively initialization circuit (30) is used to be compared the sample rate current peak I csmax in this cycle and preset value Ith
Compared with according to the first comparative result, setting the inductance threshold current Iset values in next cycle；
The preset value circuit (40) is used to provide preset value Ith；
The comparison circuit (A) is used for the inductance threshold current Iset values by the sample rate current Ics in this cycle and this cycle
It is compared, and according to the second comparative result output control signal PWM.On the inductance threshold current Iset values in described cycle are
Iset values after one period modulation.Iset values after a upper period modulation refer to compare initialization circuit (30) by upper one week
The sample rate current peak I csmax of phase compared with the first preset value Ith1 and the second preset value Ith2, compares according to first respectively
Relatively result, adjustment obtain the inductance threshold current Iset values in a cycle.
It is big that the preset value Ith includes the first preset value Ith1 and the second preset value Ith2, the first preset value Ith1
In inductance threshold current Iset, the second preset value Ith2 is more than or equal to inductance threshold current Iset, and the first preset value
Ith1 is more than the second preset value Ith2.It is specially according to the second comparative result output control signal PWM：When sample rate current Ics is big
When equal to inductance threshold current Iset, comparison circuit (A) output control signal PWM control power tube switches；Driving tube M roots
Overdrived according to control signal PWM controlling streams pipe M size of current.
Wait at work, the voltage drop in voltage drop and sampling resistor on power tube (M) is much smaller than the voltage on inductance L
Drop, it is believed that the voltage on inductance is equal to input voltage vin, and detection control circuit (10) detects the voltage on sampling resistor (R)
Vcs, voltage Vcs is consistent with the electric current Ics for flowing through inductance L because of sampling resistor (R) necessarily, and detection voltage Vcs is that electricity is flowed through in detection
Feel L electric current Ics；When sample rate current Ics is more than or equal to inductance threshold current Iset, comparison circuit (A) output control signal
PWM control power tube shut-offs；Sample circuit (20) adopts the current peak Icsmax of sample cycle, compares initialization circuit (30) by week
Phase adjustment inductance threshold current Iset value, by current peak Icsmax respectively with the first preset value Ith1 and the second preset value
Ith2 is compared, and next cycle inductance threshold current Iset value is adjusted according to the first comparative result.Described first is default
Value Ith1 is more than the second preset value Ith2.
In one embodiment of the present utility model, the sample rate current peak I csmax in this cycle is preset with first respectively
Value Ith1 and the second preset value Ith2 are compared, and according to the first comparative result, set the inductance threshold current in next cycle
Iset values are specially：If the current peak Icsmax in this cycle is more than or equal to the first preset value Ith1, next cycle is turned down
Inductance threshold current Iset values.In next cycle, sample circuit (20) sample rate current Ics value, and by the electric current in next cycle
Peak I csmax, which is passed to, compares initialization circuit (30), and comparison circuit (A) is by the electric current Ics values in next cycle and under turning down
One cycle inductance threshold current Iset is compared, and power tube (M) is controlled according to the second comparative result output control signal PWM
Shut-off.Because next cycle inductance threshold current Iset is turned down, electric current Ics values reach next cycle inductance threshold current Iset when
Between shorten, so as to shifting to an earlier date switch-off power pipe (M) in next cycle, reduce next periodic current peak I csmax value.
If the current peak Icsmax in this cycle is less than the second preset value Ith2, next cycle inductance threshold current is heightened
Iset values；In next cycle, sample circuit (20) sample rate current Ics value, and next periodic current peak I csmax is transmitted
To comparing initialization circuit (30), comparison circuit (A) is by the electric current Ics values in next cycle and adjusted next cycle inductance threshold value
Electric current Iset is compared, and the shut-off of power tube (M) is controlled according to the second comparative result output control signal PWM.Because of next week
Phase, inductance threshold current Iset was heightened, and electric current Ics values reach next cycle inductance threshold current Iset time increase, so that
Next cycle delay switch-off power pipe (M), improve next periodic current peak I csmax value.
Compare initialization circuit (30) according to the current peak Icsmax in next cycle respectively with the first preset value Ith1 and
Two preset value Ith2 are compared, according to comparative result, the inductance threshold current Iset values in next cycle under setting.
In next cycle under, repeat the process in its previous cycle.
The adjustment inductance threshold current Iset values of above-mentioned Cycle by Cycle, current peak Icsmax values are made to be limited in first default
Between value Ith1 and the second preset value Ith2, current peak Icsmax fluctuation range is controlled, improves electric current Ics precision.
Fig. 2 is the comparison initialization circuit (30) in a kind of Switching Power Supply high precision peak current circuit of the present utility model
Structural representation, as shown in Fig. 2 the relatively initialization circuit (30) includes the first comparison circuit (P1), the second comparison circuit
(P2) and setting adjustment circuit (31).The input of first comparison circuit (P1) and the second comparison circuit (P2) is electric with sampling respectively
Road (20) and preset value circuit (40) connection.Two inputs of the first comparison circuit (P1) connect preset value circuit (40) respectively
The first preset value Ith1 output ends and sample rate current peak I csmax, the second comparison circuit (P2) two inputs difference
Connect the second preset value Ith2 output ends and sample rate current peak I csmax of preset value circuit (40), the first comparison circuit
(P1), the output end connection setting adjustment circuit (31) of the second comparison circuit (P2), setting adjustment circuit (31) are used for according to the
The output of one comparison circuit (P1), the second comparison circuit (P2) is adjusted to inductance threshold current Iset.Described first compares
Circuit (P1) is used for by current peak Icsmax compared with the first preset value Ith1, and the second comparison circuit (P2) is used for electricity
Stream peak value Icsmax and the second preset value Ith2 are compared, and the setting adjustment circuit (31) is used for according to the first comparative result
Adjust next cycle inductance threshold current Iset value；The first preset value Ith1 is more than the second preset value Ith2.
As shown in figure 3, a kind of Switching Power Supply high precision peak current detection control circuit of the present utility model, the detection
Control circuit includes sample circuit (20), compares initialization circuit (30), preset value circuit (40) and comparison circuit (A)；
Sample circuit (20) is connected to the second input of comparison circuit (A) and the output end of power tube (M), compares setting
The first input end of circuit (30) connection sample circuit (20), preset value circuit (40) and comparison circuit (A).Comparison circuit (A)
Output end be connected to power tube (M) control terminal.
The sample circuit (20) is used for the peak I csmax for detecting electric current Ics and sample rate current Ics；
The preset value circuit (40) is used to provide preset value Ith；The relatively initialization circuit (30) was used for this cycle
Sample rate current peak I csmax compared with preset value Ith, according to the first comparative result, set the inductance threshold in next cycle
It is worth electric current Iset values；
The comparison circuit (A) is used for the inductance threshold current Iset values by the sample rate current Ics in this cycle and this cycle
It is compared, and according to the second comparative result output control signal PWM.
The inductance threshold current Iset values in described cycle are the Iset values after a upper period modulation；
The preset value Ith includes the first preset value Ith1 and the second preset value Ith2, wherein, the first preset value Ith1 is big
In inductance threshold current Iset, the second preset value Ith2 is more than or equal to inductance threshold current Iset, and the first preset value Ith1 is big
In the second preset value Ith2.
The relatively initialization circuit (30) includes the first comparison circuit (P1), the second comparison circuit (P2) and adjustment circuit
31.The input of first comparison circuit (P1) and the second comparison circuit (P2) respectively with sample circuit (20), preset value circuit
(40) connect.The first preset value Ith1 that two inputs of the first comparison circuit (P1) connect preset value circuit (40) respectively is defeated
Go out end and sample rate current peak I csmax, two inputs of the second comparison circuit (P2) connect preset value circuit (40) respectively
Second preset value Ith2 output ends and sample rate current peak I csmax, the first comparison circuit (P1), the second comparison circuit (P2)
Output end connect adjustment circuit 31, adjustment circuit 31 be used for according to the first comparison circuit (P1), the second comparison circuit (P2) it is defeated
Go out and inductance threshold current Iset is adjusted.
In one embodiment of the present utility model, the sample rate current peak I csmax in this cycle is preset with first respectively
Value Ith1 and the second preset value Ith2 are compared, and according to the first comparative result, set the inductance threshold current in next cycle
Iset values are specially：If the current peak Icsmax in this cycle is more than or equal to the first preset value Ith1, next cycle is turned down
Inductance threshold current Iset values；In next cycle, sample circuit (20) sample rate current Ics value, and by the electric current in next cycle
Peak I csmax, which is passed to, compares initialization circuit (30), and comparison circuit (A) is by the electric current Ics values in next cycle and under turning down
One cycle inductance threshold current Iset is compared, and power tube (M) is controlled according to the second comparative result output control signal PWM
Shut-off.Because next cycle inductance threshold current Iset is turned down, electric current Ics values reach next cycle inductance threshold current Iset when
Between shorten, so as to shifting to an earlier date switch-off power pipe (M) in next cycle, reduce next periodic current peak I csmax value.
If the current peak Icsmax in this cycle is less than the second preset value Ith2, next cycle inductance threshold current is heightened
Iset values；In next cycle, sample circuit (20) sample rate current Ics value, and next periodic current peak I csmax is transmitted
To comparing initialization circuit (30), comparison circuit (A) is by the electric current Ics values in next cycle and adjusted next cycle inductance threshold value
Electric current Iset is compared, and the shut-off of power tube (M) is controlled according to the second comparative result output control signal PWM.Because of next week
Phase, inductance threshold current Iset was heightened, and electric current Ics values reach next cycle inductance threshold current Iset time increase, so that
Next cycle delay switch-off power pipe (M), improve next periodic current peak I csmax value.
The comparison circuit (A) carries out the inductance threshold current Iset values in the sample rate current Ics in this cycle and this cycle
Compare, and according to the second comparative result output control signal, be specially：On the inductance threshold current Iset values in described cycle are
Iset values after one period modulation；Iset values after a upper period modulation refer to compare initialization circuit (30) by upper one week
The sample rate current peak I csmax of phase compared with the first preset value Ith1 and the second preset value Ith2, compares according to first respectively
Relatively result, adjustment obtain the inductance threshold current Iset values in a cycle.Preferably, the detection control circuit is control core
Piece.
Fig. 4 is a kind of Switching Power Supply high precision peak current threshold adjustment circuit of the present utility model, the current threshold
Adjustment circuit includes sample circuit (20), compares initialization circuit (30), preset value circuit (40)；It is the sample circuit (20), pre-
If value circuit (40) initialization circuit (30) compared with is connected；
The sample circuit (20) is used for the peak I csmax for detecting electric current Ics and sample rate current Ics；
The preset value circuit (40) is used to provide preset value Ith；
The relatively initialization circuit (30) is used for current peak Icsmax respectively compared with preset value Ith, and root
Next cycle inductance threshold current Iset value is adjusted according to the first comparative result.
The preset value Ith includes the first preset value Ith1 and the second preset value Ith2, wherein, the first preset value Ith1 is big
In inductance threshold current Iset, the second preset value Ith2 is more than or equal to inductance threshold current Iset, and the first preset value Ith1 is big
In the second preset value Ith2.
The relatively initialization circuit (30) includes the first comparison circuit (P1), the second comparison circuit (P2) and setting adjustment electricity
Road (31)；First comparison circuit (P1) is used for by current peak Icsmax compared with the first preset value Ith1, and second
Comparison circuit (P2) is used to current peak Icsmax and the second preset value Ith2 being compared, the setting adjustment circuit (31)
For adjusting next cycle inductance threshold current Iset value according to the first comparative result；The first preset value Ith1 is more than the
Two preset value Ith2.
Fig. 5 show a kind of Switching Power Supply high precision peak current control method of the present utility model, including：
S1, detection switch this cycle of power supply flow through the electric current Ics of inductance coil, and record current peak I csmax；
S2, by the current peak Icsmax in this cycle compared with preset value Ith, and according to the first comparative result adjust
Next cycle inductance threshold current Iset value；
S3, exported and controlled according to the electric current Ics and the inductance threshold current Iset in this cycle in this cycle the second comparative result
Signal processed.
The inductance threshold current Iset values in described cycle are the Iset values after a upper period modulation, are opened for Switching Power Supply
First inductance threshold current Iset value after dynamic can use setting value；
It is big that the preset value Ith includes the first preset value Ith1 and the second preset value Ith2, the first preset value Ith1
In inductance threshold current Iset, the second preset value Ith2 is more than or equal to inductance threshold current Iset, and the first preset value
Ith1 is more than the second preset value Ith2.
In one embodiment of the present utility model, the sample rate current peak I csmax in this cycle is preset with first respectively
Value Ith1 and the second preset value Ith2 are compared, and according to the first comparative result, set the inductance threshold current in next cycle
Iset values are specially：If the current peak Icsmax in this cycle is more than or equal to the first preset value Ith1, next cycle is turned down
Inductance threshold current Iset values；In next cycle, sample circuit (20) sample rate current Ics value, and by the electric current in next cycle
Peak I csmax, which is passed to, compares initialization circuit (30), and comparison circuit (A) is by the electric current Ics values in next cycle and under turning down
One cycle inductance threshold current Iset is compared, the shut-off of output control signal PWM control power tubes (M).Because of next cycle
Inductance threshold current Iset is turned down, and the time that electric current Ics values reach next cycle inductance threshold current Iset shortens, so that
Next cycle shifts to an earlier date switch-off power pipe (M), reduces next periodic current peak I csmax value.
If the current peak Icsmax in this cycle is less than the second preset value Ith2, next cycle inductance threshold current is heightened
Iset values；In next cycle, sample circuit (20) sample rate current Ics value, and next periodic current peak I csmax is transmitted
To comparing initialization circuit (30), comparison circuit (A) is by the electric current Ics values in next cycle and adjusted next cycle inductance threshold value
Electric current Iset is compared, the shut-off of output control signal PWM control power tubes (M).Because of next cycle inductance threshold current
Iset is heightened, and electric current Ics values reach next cycle inductance threshold current Iset time increase, so as to be closed in next cycle delay
Disconnected power tube (M), improve next periodic current peak I csmax value.Tune by Cycle by Cycle to inductance threshold current Iset
It is whole, current peak Icsmax is dynamically fixed between the first preset value Ith1 and the second preset value Ith2.Preferably, examine
Electric current Ics is surveyed to carry out by detecting voltage Vcs.
Although describing the utility model by embodiment, it will be appreciated by the skilled addressee that the utility model has perhaps
Shape changeable and change without departing from spirit of the present utility model, it is desirable to appended claim include these deformation and change without
Depart from spirit of the present utility model.
Claims (10)
1. a kind of Switching Power Supply high precision peak current circuit, it is characterised in that the current circuit includes：Inductance coil (L),
Power tube (M), sampling resistor (R) and detection control circuit (10)；
The inductance coil (L), power tube (M), sampling resistor (R) are sequentially connected, sampling resistor (R) ground connection, detection control electricity
The input on road (10) is connected to power tube (M) output end, and the output end of detection control circuit (10) is connected to power tube (M)
Control terminal；The inductance coil (L) can be primary side inductance coil；
The detection control circuit (10) includes sample circuit (20), compares initialization circuit (30), preset value circuit (40) and ratio
Compared with circuit (A)；Sample circuit (20) is connected to the second input of comparison circuit (A) and the output end of power tube (M), compares and sets
Determine the first input end that circuit (30) is connected to sample circuit (20), preset value circuit (40) and comparison circuit (A).
2. current circuit according to claim 1, it is characterised in that the relatively initialization circuit (30) compares including first
Circuit (P1), the second comparison circuit (P2) and setting adjustment circuit (31), the first comparison circuit (P1) and the second comparison circuit
(P2) input is connected with sample circuit (20), the output end connection of the first comparison circuit (P1), the second comparison circuit (P2)
Set adjustment circuit (31).
3. current circuit according to claim 2 a, it is characterised in that input of first comparison circuit (P1)
Be connected with an input of the second comparison circuit (P2) with sample circuit (20), first comparison circuit (P1) another
Input connects the first preset value output end of the preset value circuit, another input of second comparison circuit (P2)
Connect the second preset value output end of the preset value circuit.
4. current circuit according to claim 1, it is characterised in that the output end of comparison circuit (A) is connected to power tube
(M) control terminal.
5. according to the current circuit described in claim any one of 1-4, it is characterised in that the detection control circuit (10) is control
Coremaking piece.
6. a kind of Switching Power Supply high precision peak current detection control circuit, it is characterised in that the detection control circuit includes
Sample circuit (20), compare initialization circuit (30), preset value circuit (40) and comparison circuit (A)；Sample circuit (20) is connected to
Second input of comparison circuit (A), compare initialization circuit (30) and be connected to sample circuit (20), preset value circuit (40) and ratio
Compared with circuit (A) first input end.
7. detection control circuit according to claim 6, it is characterised in that the relatively initialization circuit (30) includes first
Comparison circuit (P1), the second comparison circuit (P2) and setting adjustment circuit (31),
One input of first comparison circuit (P1) and the input and sample circuit of the second comparison circuit (P2)
(20) connect, another input of first comparison circuit (P1) connects the first preset value output of the preset value circuit
End, another input of second comparison circuit (P2) connect the second preset value output end of the preset value circuit.
8. detection control circuit according to claim 6, it is characterised in that the detection control circuit is control chip.
9. a kind of Switching Power Supply peak point current adjustment circuit, it is characterised in that the matrix current adjustment circuit includes sample circuit
(20) initialization circuit (30) and preset value circuit (40), are compared；The sample circuit (20) and the preset value circuit (40) point
Initialization circuit (30) is connected not compared with；The relatively initialization circuit (30) is electric including the first comparison circuit (P1), the second comparison
The input and sample circuit of road (P2) and setting adjustment circuit (31), the first comparison circuit (P1) and the second comparison circuit (P2)
(20) connect, the first comparison circuit (P1), the output end connection setting adjustment circuit (31) of the second comparison circuit (P2).
10. peak point current adjustment circuit according to claim 9, it is characterised in that first comparison circuit (P1)
One input of one input and the second comparison circuit (P2) is connected with sample circuit (20), first comparison circuit
(P1) another input connects the first preset value output end of the preset value circuit, second comparison circuit (P2)
Another input connects the second preset value output end of the preset value circuit.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110932575A (en) * | 2019-12-25 | 2020-03-27 | 成都启臣微电子股份有限公司 | Control system and method for preventing large and small waves in flyback switching power supply |
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2017
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110932575A (en) * | 2019-12-25 | 2020-03-27 | 成都启臣微电子股份有限公司 | Control system and method for preventing large and small waves in flyback switching power supply |
| CN110932575B (en) * | 2019-12-25 | 2022-04-08 | 成都启臣微电子股份有限公司 | Control system and method for preventing large and small waves in flyback switching power supply |
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