CN208461693U - High input voltage DC-DC converter - Google Patents
High input voltage DC-DC converter Download PDFInfo
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- CN208461693U CN208461693U CN201821200741.4U CN201821200741U CN208461693U CN 208461693 U CN208461693 U CN 208461693U CN 201821200741 U CN201821200741 U CN 201821200741U CN 208461693 U CN208461693 U CN 208461693U
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Abstract
The utility model discloses a kind of high input voltage DC-DC converter, including loop control unit, difference sample circuit, driving circuit, the first power tube, first diode, inductance, input capacitance, output capacitance；The difference sample circuit linkloop control unit, loop control unit connect driving circuit；Result is output to loop control unit to obtain the pressure difference of setting two o'clock by output voltage anode Vo+, input terminal of the output voltage cathode Vo- as difference sample circuit, difference sample circuit；Loop control unit carries out the duty cycle adjustment of the first power tube to the pressure difference data sent according to difference sample circuit, and related data is sent to the driving circuit；Driving circuit drives the first power tube switch motion to the related data for combining loop control unit to send.The utility model proposes high input voltage DC-DC converter, design circuit can be simplified, reduce cost, while the requirement to preparation process mesohigh device creepage is also reduced.
Description
Technical field
The utility model belongs to electronic information technical field, is related to a kind of DC-DC converter more particularly to a kind of high pressure is defeated
Enter DC-DC converter.
Background technique
With universal and product function the enhancing of electronic product, the application of DC-DC converter is developed rapidly, than
Such as the increase of electronic vehicle product, the intelligence of electric bicycle, internet of things product it is universal.The DC- in these products
DC converter applications are very extensive, but are different from the DC-DC converter of other field, DC-DC converter in these application fields
Wider input voltage range is needed, minimum input voltage may be in 20V or more, and maximum input voltage needs support 100V
It is even higher, and output voltage is in contrast lower, majority is in 10V or less.These requirements to the integrated level of converter, cost and
The complexity of design proposes challenge.
Traditional scheme is as shown in Figure 1.Q1 is the enhanced MOSFET of N-channel, source electrode and sustained diode 1 and main electricity
Feel L to be connected, drain electrode is connected with input voltage vin, and Q1 works and leads in cut-off region and saturation region, saturation region when system worked well
It is logical that impedance is small that system transfer efficiency can be improved.
Since its turn-on condition is that grid source drive voltage (Vgs) is positive pressure and is greater than certain voltage, so in the following figure
The reference point of the power supply of " floating gate driving " unit should be the grid of Q1.For this purpose, needing to include D2 in traditional scheme, floating supplying
Electric unit and C1.The circuit theory of this part is, when sustained diode 1 is connected, C1 passes through circuit D2, floating ground power supply unit
Charging, after D1 cut-off, since D2 also reversed cut-off simultaneously, the charge of C1 is used as the power supply of " floating gate driving " unit.
In addition, realizing that output voltage control also needs resistor voltage divider network, loop amplifier EA, reference voltage in traditional scheme
Vref, loop compensation circuit and duty ratio modulation circuit.First using output voltage as feedback compared with benchmark Vref, after comparing
Obtained error is exported by loop compensation circuit to duty ratio modulation circuit, is finally obtained needed for meeting output voltage target
The conducting dutycycle of Q1.But since reference voltage Vref reference point is " ground " exported, therefore the output of duty ratio modulation circuit
The reference point of signal is also " ground " of output, and the cathode that driving signal reference point needed for Q1 conducting is D1, so duty ratio
Modulation circuit and floating delete also need level buanch unit between driving unit.
Existing scheme has following defects that
1, complex circuit designs.C1, floating ground power supply unit, D2 and level buanch unit are necessary part in traditional scheme,
Increase system design cost
2, semiconductor technology is with high requirements and high cost.Due to floating gate driving unit, floating ground driving unit and Q1 reference point all
Be with output " ground " non-equal node, need high anti-common mode interference ability in normal work；It can in order to guarantee system
By property, need three parts circuit to the leakage current polar region of output " ground ", in order to avoid cause the damage of device.Due to semiconductor devices
When pressure resistance is higher, leakage current is bigger, so the requirement to wafer processing technology is higher, production cost when input voltage is higher
Also it increase accordingly.Support the wafer processing technology to this partial function of 100V also immature at present.
In view of this, nowadays there is an urgent need to design a kind of DC-DC converter, to overcome existing DC-DC converter to exist
Drawbacks described above.
Utility model content
The technical problem to be solved by the utility model is to provide a kind of high input voltage DC-DC converters, can simplify design
Circuit reduces cost, while the requirement to preparation process mesohigh device creepage is also reduced.
In order to solve the above technical problems, the utility model adopts the following technical solution:
A kind of high input voltage DC-DC converter, the DC-DC converter include: loop control unit, difference sampling electricity
Road, driving circuit, the first power tube Q1, first diode D1, inductance L, input capacitance Cin, output capacitance Cout；
The first end of the input capacitance Cin is separately connected input voltage vin, the cathode of first diode D1, output electricity
Hold first end, the output voltage anode Vo+, difference sample circuit of Cout；The second end of input capacitance Cin is grounded；
The anode of the first diode D1 is separately connected the drain electrode of the first end of inductance L, the first power tube Q1；The electricity
The second end of sense L is separately connected the second end of output capacitance Cout, output voltage cathode Vo-, difference sample circuit；
The source electrode of the first power tube Q1 is grounded, alternatively, the source electrode of the first power tube Q1 passes through a resistance eutral grounding；
The grid of first power tube Q1 connects the driving circuit；
The difference sample circuit linkloop control unit, the loop control unit connect driving circuit；
The input terminal of output voltage anode Vo+, output voltage cathode Vo- as the difference sample circuit, the difference
Result is output to loop control unit to obtain the pressure difference of setting two o'clock by sample circuit；
The loop control unit carries out the first power tube to the pressure difference data sent according to the difference sample circuit
The duty ratio modulation of Q1, and the data result information that duty ratio modulation goes out is sent to the driving circuit；
The data result information that the driving circuit goes out to the duty ratio modulation that sends in conjunction with the loop control unit
The first power tube Q1 switch motion is driven, the pressure difference between control output voltage anode Vo+ and output voltage cathode Vo- meets defeated
The target of voltage out；
The loop control unit includes loop amplifier EA, reference voltage generation unit, loop compensation circuit, duty ratio tune
Circuit processed；The reference voltage generation unit is to generate reference voltage Vref；The loop amplifier EA to calculate feedback and
Comparison result is sent to loop and mended by the error between reference voltage Vref by two o'clock pressure difference compared with reference voltage Vref
Repay circuit；The loop compensation circuit is exported to carry out error compensation according to the comparison result of loop amplifier EA to duty ratio
Modulation circuit；The duty ratio modulation circuit is obtained to carry out duty ratio modulation according to the error compensation of loop compensation circuit
The duty cycle signals of first power tube Q1 driving, and obtained duty cycle signals are exported to driving circuit；
The output of the difference sample circuit is the feedback of loop control unit, and the output of difference sample circuit is separately connected
The negative input of the second end of loop compensation circuit, loop amplifier EA, the electrode input end connection benchmark electricity of loop amplifier EA
Press the first end of generation unit, the second end ground connection of reference voltage generation unit；The first end of the loop compensation circuit connects
Output end, the duty ratio modulation circuit of loop amplifier EA.
The input terminal of the difference sample circuit is output voltage anode Vo+ and output voltage cathode Vo-, difference sampling electricity
Road is output to loop amplifier EA input terminal after obtaining two o'clock pressure difference, by two o'clock pressure difference, and loop amplifier EA is by itself and reference voltage
Vref compares；Loop compensation circuit exports the compensation of the error compared and gives duty ratio modulation circuit, obtains the first power tube Q1
The duty cycle signals of driving；Duty ratio modulation circuit exports obtained duty cycle signals to driving circuit, and driving circuit is with this
The first power tube Q1 switch motion is driven, the pressure difference between control output voltage anode Vo+ and output voltage cathode Vo- meets defeated
The target of voltage out；
The reference point of the difference sample circuit is " ground " of input voltage vin；The driving electricity of the first power tube Q1
The reference point of road part is identical as " ground " of input voltage vin；
The difference sample circuit includes comparator, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance
R4；The negative input of the comparator is separately connected the second end of the first end of 3rd resistor R3, the 4th resistance R4；Third electricity
The second end for hindering R3 connects output voltage cathode Vo-, the first end connection of the 4th resistance R4, the output end of comparator；The ratio
Compared with the first end that the electrode input end of device is separately connected the first end of first resistor R1, second resistance R2；The of first resistor R1
Two ends connect output voltage anode Vo+, the second end ground connection of second resistance R2.
A kind of high input voltage DC-DC converter, the DC-DC converter include: loop control unit, difference sampling electricity
Road, driving circuit, the first power tube Q1, first diode D1, inductance L, input capacitance Cin, output capacitance Cout；
The first end of the input capacitance Cin is separately connected input voltage vin, the cathode of first diode D1, output electricity
Hold first end, the output voltage anode Vo+, difference sample circuit of Cout；The second end of input capacitance Cin is grounded；
The anode of the first diode D1 is separately connected the drain electrode of the first end of inductance L, the first power tube Q1；The electricity
The second end of sense L is separately connected the second end of output capacitance Cout, output voltage cathode Vo-, difference sample circuit；
The source electrode of the first power tube Q1 is grounded, alternatively, the source electrode of the first power tube Q1 is connect by a resistance R
Ground；The grid of first power tube Q1 connects the driving circuit；
The difference sample circuit linkloop control unit, the loop control unit connect driving circuit；
The input terminal of output voltage anode Vo+, output voltage cathode Vo- as the difference sample circuit, the difference
Result is output to loop control unit to obtain the pressure difference of setting two o'clock by sample circuit；
The loop control unit carries out the first power tube to the pressure difference data sent according to the difference sample circuit
The duty ratio modulation of Q1, and the data result information that duty ratio modulation goes out is sent to the driving circuit；
The data result information that the driving circuit goes out to the duty ratio modulation that sends in conjunction with the loop control unit
Drive the first power tube Q1 switch motion.
As a kind of preferred embodiment of the utility model, the loop control unit includes loop amplifier EA, reference voltage
Generation unit, loop compensation circuit, duty ratio modulation circuit；
The reference voltage generation unit is to generate reference voltage Vref；
The loop amplifier EA is to calculate the error between feedback and reference voltage Vref, by two o'clock pressure difference and benchmark electricity
Pressure Vref compares, and comparison result is sent to loop compensation circuit；
The loop compensation circuit is exported to carry out error compensation according to the comparison result of loop amplifier EA to duty ratio
Modulation circuit；
The duty ratio modulation circuit obtains the to carry out duty ratio modulation according to the error compensation of loop compensation circuit
The duty cycle signals of one power tube Q1 driving, and obtained duty cycle signals are exported to driving circuit；
The output of the difference sample circuit is the feedback of loop control unit, and the output of difference sample circuit is separately connected
The negative input of the second end of loop compensation circuit, loop amplifier EA, the electrode input end connection benchmark electricity of loop amplifier EA
Press the first end of generation unit, the second end ground connection of reference voltage generation unit；The first end of the loop compensation circuit connects
Output end, the duty ratio modulation circuit of loop amplifier EA.
As a kind of preferred embodiment of the utility model, the input terminal of the difference sample circuit is output voltage anode Vo
+ and output voltage cathode Vo-, after obtaining two o'clock pressure difference by its result be output to error operational amplifier input terminal again with reference voltage
Vref compares；Then it, then by loop compensation circuit the compensation of the error compared is exported gives duty ratio modulation circuit, obtain the
The duty cycle signals of one power tube Q1 driving；Finally, outputing it to driving circuit drives the first power tube Q1 switch motion.
As a kind of preferred embodiment of the utility model, the source electrode of the first power tube Q1 is grounded；The duty ratio tune
Circuit processed includes the 5th comparator, saw-toothed wave generator, and the negative input of the 5th comparator connects the output of error operational amplifier EA,
The electrode input end of 5th comparator connects saw-toothed wave generator, and the output end of the 5th comparator connects driving circuit.
As a kind of preferred embodiment of the utility model, the source electrode of the first power tube Q1 is sampled by a peak point current
Resistance Rsen ground connection, the first of the source electrode of the first power tube of duty ratio modulation circuit connection Q1 and peak point current sampling resistor Rsen
End, the second end ground connection of peak point current sampling resistor Rsen；
The duty ratio modulation circuit includes the second trigger, the 4th comparator, and the cathode of the 4th comparator inputs
The output end of end connection error operational amplifier EA, the first of the electrode input end connection peak value current sampling resistor Rsen of the 4th comparator
End, the output end of the 4th comparator connect the second end of the second trigger；When frequency is determined in the first input end reception of second trigger
Clock signal, the second end of the second trigger connect the output end of the 4th comparator, the output end connection driving electricity of the second trigger
Road；
The output of the error operational amplifier EA is inputted as the negative sense of the 4th comparator, and peak point current sampling resistor Rsen
Forward direction input of the signal as first comparator；The driving circuit of first power tube Q1 receives the output signal of the second trigger,
The fixed frequency of the first power tube Q1 is open-minded under the triggering for determining frequency clock signal, opens rear peak value current sampling resistor Rsen and flows through electric current
It generates voltage signal to compare in the output with error operational amplifier EA, when peak point current sampling resistor Rsen signal is higher than error operational amplifier
Output when trigger be reset, the first power tube Q1 is closed under the action of start-up circuit.
As a kind of preferred embodiment of the utility model, the loop control unit includes first comparator, second compares
Device, trigger；For the source electrode of the first power tube Q1 by a resistance eutral grounding, which is peak point current sampling resistor Rsen；
The first end of the source electrode connection peak value current sampling resistor Rsen of first power tube Q1, the second of peak point current sampling resistor Rsen
End ground connection；
The negative input of the first comparator connects the difference sampling unit, the electrode input end of first comparator
Voltage reference Vref_cv is connected, the output end of first comparator connects the first input end of the trigger；
The electrode input end of second comparator connects peak value current reference voltage Vref_ocp, and the second comparator is born
Pole input terminal connects the first end of the source electrode of the first power tube Q1, peak point current sampling resistor Rsen, the output of the second comparator
End connects the second input terminal of the trigger；The output end of the trigger connects the driving circuit；
The output of difference sampling unit is compared by the first comparator with voltage reference Vref_cv, when voltage base
Quasi- Vref_cv be higher than difference sampling output when, first comparator overturning cause coupled trigger set be 1, rear-guard
Dynamic circuit triggers the first power tube Q1 conducting and generates voltage signal on peak point current sampling resistor Rsen, when peak point current samples
When resistance Rsen signal is greater than peak point current reference voltage Vref_ocp, the overturning of the second comparator leads to trigger reset to close
Close driving circuit output, the first power tube Q1 shutdown.
As a kind of preferred embodiment of the utility model, the reference point of the difference sample circuit is input voltage Vi n's
" ground ".
As a kind of preferred embodiment of the utility model, the reference point of the driving circuit section of the first power tube Q1 with
" ground " of input voltage vin is identical.
As a kind of preferred embodiment of the utility model, the difference sample circuit includes comparator, first resistor R1,
Two resistance R2,3rd resistor R3, the 4th resistance R4；
The negative input of the comparator is separately connected the second end of the first end of 3rd resistor R3, the 4th resistance R4；
The second end of 3rd resistor R3 connects output voltage cathode Vo-, the first end connection of the 4th resistance R4, the output end of comparator；
The electrode input end of the comparator is separately connected the first end of the first end of first resistor R1, second resistance R2；
The second end of first resistor R1 connects output voltage anode Vo+, the second end ground connection of second resistance R2.
A kind of high input voltage DC-DC converter, the DC-DC converter include: loop control unit, difference sampling electricity
Road, driving circuit, the first power tube Q1, first diode D1；
The drain electrode of the first power tube Q1 of anode connection of the first diode D1；The source electrode of the first power tube Q1 connects
Ground, alternatively, the source electrode of the first power tube Q1 is grounded by a resistance R；The grid of first power tube Q1 connects the driving
Circuit；
The difference sample circuit linkloop control unit, the loop control unit connect driving circuit；
The input terminal of output voltage anode Vo+, output voltage cathode Vo- as the difference sample circuit, the difference
Result is output to loop control unit to obtain the pressure difference of setting two o'clock by sample circuit；
The loop control unit carries out the first power tube to the pressure difference data sent according to the difference sample circuit
The duty cycle adjustment of Q1, and the data result information that duty ratio modulation goes out is sent to the driving circuit；
The data result information that the driving circuit goes out to the duty ratio modulation that sends in conjunction with the loop control unit
The first power tube Q1 switch motion is driven, the pressure difference between control output voltage anode Vo+ and output voltage cathode Vo- meets defeated
The target of voltage out.
A kind of control method of above-mentioned high input voltage DC-DC converter, the control method include the following steps:
Difference sample circuit obtains the pressure difference of output voltage anode Vo+, output voltage cathode Vo- two o'clock, and result is defeated
Loop control unit is arrived out；
Loop control unit carries out the duty of the first power tube Q1 according to the pressure difference data that the difference sample circuit is sent
Driving circuit is sent to than adjusting, and by the data result information that duty ratio modulation goes out；
The data result information that the duty ratio modulation that driving circuit combination loop control unit is sent goes out drives the first power
Pipe Q1 switch motion controls the mesh that the pressure difference between output voltage anode Vo+ and output voltage cathode Vo- meets output voltage
Mark.
As a kind of preferred embodiment of the utility model, the control method specifically comprises the following steps:
The input terminal of difference sample circuit is that output voltage anode Vo+ and output voltage cathode Vo-, difference sample circuit exist
After obtaining two o'clock pressure difference, two o'clock pressure difference is output to loop amplifier EA input terminal；
Comparison result compared with reference voltage Vref, is sent to loop compensation electricity by two o'clock pressure difference by loop amplifier EA
Road；
Loop compensation circuit carries out error compensation according to the comparison result of loop amplifier EA, and duty ratio modulation electricity is given in output
Road；
Duty ratio modulation circuit carries out duty ratio modulation according to the error compensation of loop compensation circuit, obtains the first power tube
The duty cycle signals of Q1 driving, and obtained duty cycle signals are exported to driving circuit；
Duty cycle signals drive the first power tube Q1 switch motion, control output voltage anode to driving circuit based on the received
Pressure difference between Vo+ and output voltage cathode Vo- meets the target of output voltage.
The utility model has the beneficial effects that: the utility model proposes high input voltage DC-DC converter, can save
Floating gate driving unit, charging diode D2, floating ground power supply unit, system circuit design simplify, and production cost is reduced.
After the utility model improves, wafer processing technology difficulty is reduced.Since traditional scheme must have floating gate drive
Moving cell, pressure resistance is opposite to be inputted for " ground " equal to input voltage+Q1 gate driving cut-in voltage, and the circuit of this part removes
Other than high pressure resistant, it is also necessary to have a requirement of senior engineer's mould interference rejection capability and low-leakage current；And the drive of utility model scheme
Dynamic part reference point is connected with input " ground ", and the circuit highest pressure of entire control section is equal to input voltage, to preparation process
The requirement of mesohigh device creepage is also minimized.
Detailed description of the invention
Fig. 1 is the circuit diagram of existing DC-DC converter.
Fig. 2 is the circuit diagram of the utility model high input voltage DC-DC converter.
The schematic diagram in energy transmission direction when Fig. 3 is Q1 conducting in the utility model high input voltage DC-DC converter.
Fig. 4 is the schematic diagram in energy transmission direction after Q1 cut-off in the utility model high input voltage DC-DC converter.
Fig. 5 is the circuit diagram of difference sample circuit in the utility model high input voltage DC-DC converter.
Fig. 6 is the circuit diagram of the utility model high input voltage DC-DC converter in embodiment two.
Fig. 7 is the circuit diagram of the utility model high input voltage DC-DC converter in embodiment three.
Fig. 8 is that the circuit of duty ratio modulation circuit in the utility model high input voltage DC-DC converter in embodiment one shows
It is intended to.
Fig. 9 is that the circuit of duty ratio modulation circuit in the utility model high input voltage DC-DC converter in embodiment three shows
It is intended to.
Specific embodiment
The preferred embodiment that according to the present invention will be described in detail below with reference to the accompanying drawings.
Embodiment one
Referring to Fig. 2, the utility model discloses a kind of high input voltage DC-DC converter, the DC-DC converter packet
It includes: loop control unit, difference sample circuit, driving circuit, the first power tube Q1, first diode D1, inductance L, input electricity
Hold Cin, output capacitance Cout.
The first end of the input capacitance Cin is separately connected input voltage vin, the cathode of first diode D1, output electricity
Hold first end, the output voltage anode Vo+, difference sample circuit of Cout；The second end of input capacitance Cin is grounded.Described first
The anode of diode D1 is separately connected the drain electrode of the first end of inductance L, the first power tube Q1；The second end of the inductance L is distinguished
Connect second end, the output voltage cathode Vo-, difference sample circuit of output capacitance Cout.The source electrode of the first power tube Q1
Ground connection, alternatively, the source electrode of the first power tube Q1 connects one end of a resistance R, the other end ground connection of resistance R；First function
The grid of rate pipe Q1 connects the driving circuit.
The difference sample circuit linkloop control unit, the loop control unit connect driving circuit.Output electricity
The input terminal of positive pressure pole Vo+, output voltage cathode Vo- as the difference sample circuit, the difference sample circuit is to obtain
The pressure difference of setting two o'clock is taken, and result is output to loop control unit.The loop control unit is to according to the difference
The pressure difference data that sample circuit is sent carries out the duty cycle adjustment of the first power tube Q1, and the data result that duty ratio modulation is gone out
Information is sent to the driving circuit.The driving circuit goes out to the duty ratio modulation sent in conjunction with the loop control unit
Data result information drive the first power tube Q1 switch motion.
The present embodiment exists, and please see Fig. 2 to Fig. 4, as a kind of preferred embodiment of the utility model, the loop control is single
Member includes loop amplifier EA, reference voltage generation unit, loop compensation circuit, (wherein, Fig. 3 is disclosed duty ratio modulation circuit
Energy transmission direction when Q1 is connected, Fig. 4 disclose energy transmission direction after Q1 cut-off).
The reference voltage generation unit is to generate reference voltage Vref.The loop amplifier EA to calculate feedback and
Comparison result is sent to loop and mended by the error between reference voltage Vref by two o'clock pressure difference compared with reference voltage Vref
Repay circuit.The loop compensation circuit is exported to carry out error compensation according to the comparison result of loop amplifier EA to duty ratio
Modulation circuit.The duty ratio modulation circuit is obtained to carry out duty ratio modulation according to the error compensation of loop compensation circuit
The duty cycle signals of first power tube Q1 driving, and obtained duty cycle signals are exported to driving circuit.
The output of the difference sample circuit is the feedback of loop control unit, and the output of difference sample circuit is separately connected
The negative input of the second end of loop compensation circuit, loop amplifier EA, the electrode input end connection benchmark electricity of loop amplifier EA
Press the first end of generation unit, the second end ground connection of reference voltage generation unit；The first end of the loop compensation circuit connects
Output end, the duty ratio modulation circuit of loop amplifier EA.
The input terminal of the difference sample circuit is output voltage anode Vo+ and output voltage cathode Vo-, is obtaining two o'clock
Its result is output to error operational amplifier input terminal again compared with reference voltage Vref after pressure difference；Then, then pass through loop compensation electricity
Road exports the compensation of the error compared and gives duty ratio modulation circuit, obtains the duty cycle signals of the first power tube Q1 driving；Most
Afterwards, it outputs it to driving circuit and drives the first power tube Q1 switch motion.
The reference point of the difference sample circuit is " ground " of input voltage vin；The driving electricity of the first power tube Q1
The reference point of road part is identical as " ground " of input voltage vin.
In the present embodiment, as shown in figure 5, the difference sample circuit includes comparator, first resistor R1, second resistance
R2,3rd resistor R3, the 4th resistance R4.The negative input of the comparator is separately connected the first end of 3rd resistor R3,
The second end of four resistance R4；The second end of 3rd resistor R3 connects output voltage cathode Vo-, and the first end of the 4th resistance R4 connects
It connects, the output end of comparator.The electrode input end of the comparator is separately connected the first end of first resistor R1, second resistance R2
First end；The second end of first resistor R1 connects output voltage anode Vo+, the second end ground connection of second resistance R2.
In the present embodiment, referring to Fig. 8, the source electrode of the first power tube Q1 is grounded；The duty ratio modulation circuit packet
The 5th comparator, saw-toothed wave generator are included, the output of the negative input connection error operational amplifier EA of the 5th comparator, the 5th compares
The electrode input end of device connects saw-toothed wave generator, and the output end of the 5th comparator connects driving circuit.
The output voltage A of A point are as follows:
A=(R2/ (R1+R2)) * ((R3+R4)/R3) * Vo+-R4/R3*Vo-；
If R1=R3, R2=R4, then A=R4/R3* (Vo+-V0-).
The composition of the utility model high input voltage DC-DC converter is described above, the utility model is disclosing above-mentioned change
While parallel operation forms, a kind of control method of above-mentioned high input voltage DC-DC converter is also disclosed, the control method includes such as
Lower step:
Difference sample circuit obtains the pressure difference of output voltage anode Vo+, output voltage cathode Vo- two o'clock, and result is defeated
Loop control unit is arrived out；Loop control unit carries out the first power tube according to the pressure difference data that the difference sample circuit is sent
The duty cycle adjustment of Q1, and the data result information that duty ratio modulation goes out is sent to driving circuit；Driving circuit combination loop
The data result information that the duty ratio modulation that control unit is sent goes out drives the first power tube Q1 switch motion, controls output voltage
Pressure difference between positive Vo+ and output voltage cathode Vo- meets the target of output voltage.
In the present embodiment, the control method specifically comprises the following steps:
Step S1, the input terminal of difference sample circuit is that output voltage anode Vo+ and output voltage cathode Vo-, difference are adopted
Sample circuit is output to loop amplifier EA input terminal after obtaining two o'clock pressure difference, by two o'clock pressure difference；
Step S2, comparison result is sent to loop by two o'clock pressure difference compared with reference voltage Vref by loop amplifier EA
Compensation circuit；
Step S3, loop compensation circuit carries out error compensation according to the comparison result of loop amplifier EA, exports to duty ratio
Modulation circuit；
Step S4, duty ratio modulation circuit carries out duty ratio modulation according to the error compensation of loop compensation circuit, obtains the
The duty cycle signals of one power tube Q1 driving, and obtained duty cycle signals are exported to driving circuit；
Step S5, duty cycle signals drive the first power tube Q1 switch motion, control output to driving circuit based on the received
Pressure difference between positive polarity Vo+ and output voltage cathode Vo- meets the target of output voltage.
Embodiment two
The difference between this embodiment and the first embodiment lies in the present embodiment, referring to Fig. 6, the present embodiment and embodiment one
Composition it is essentially identical, all have a loop control unit, and two embodiments of the implementation inside loop control unit it
Between it is different, but this is not the core of the utility model, and loop control unit simply forms wherein must for utility model scheme
Standby element.
In the present embodiment, the loop control unit includes first comparator, the second comparator, trigger；Described first
For the source electrode of power tube Q1 by a resistance eutral grounding, which is peak point current sampling resistor Rsen；The source electrode of first power tube Q1
Connect the first end of peak value current sampling resistor Rsen, the second end ground connection of peak point current sampling resistor Rsen.
The negative input of the first comparator connects the difference sampling unit, the electrode input end of first comparator
Voltage reference Vref_cv is connected, the output end of first comparator connects the first input end of the trigger.
The electrode input end of second comparator connects peak value current reference voltage Vref_ocp, and the second comparator is born
Pole input terminal connects the first end of the source electrode of the first power tube Q1, peak point current sampling resistor Rsen, the output of the second comparator
End connects the second input terminal of the trigger；The output end of the trigger connects the driving circuit.
The output of difference sampling unit is compared by the first comparator with voltage reference Vref_cv, when voltage base
Quasi- Vref_cv be higher than difference sampling output when, first comparator overturning cause coupled trigger set be 1, rear-guard
Dynamic circuit triggers the first power tube Q1 conducting and generates voltage signal on peak point current sampling resistor Rsen, when peak point current samples
When resistance Rsen signal is greater than peak point current reference voltage Vref_ocp, the overturning of the second comparator leads to trigger reset to close
Close driving circuit output, the first power tube Q1 shutdown.
Embodiment three
The difference between this embodiment and the first embodiment lies in the present embodiment, referring to Fig. 7, the first power tube Q1
Source electrode is by resistance R ground connection (resistance is peak point current sampling resistor Rsen), in addition, duty ratio modulation circuit connection first
The source electrode of power tube Q1 and the first end of resistance R；Which is also a kind of embodiment of the utility model.
Referring to Fig. 9, the duty ratio modulation circuit includes the second trigger, the 4th comparator, described in the present embodiment
The output end of the negative input connection error operational amplifier EA of 4th comparator, the electrode input end connection peak value electricity of the 4th comparator
The first end of sampling resistor Rsen is flowed, the output end of the 4th comparator connects the second end of the second trigger；Second trigger
Frequency clock signal is determined in first input end reception, and the second end of the second trigger connects the output end of the 4th comparator, the second triggering
The output end of device connects driving circuit.
The output of error operational amplifier EA is inputted as the negative sense of the 4th comparator, and the signal of peak point current sampling resistor Rsen
Forward direction input as first comparator；The driving circuit of first power tube Q1 receives the output signal of the second trigger, fixed
The fixed frequency of the first power tube Q1 is open-minded under the triggering of frequency clock signal, opens rear peak value current sampling resistor Rsen and flows through electric current generation
Voltage signal is compared in the output with error operational amplifier EA, when peak point current sampling resistor Rsen signal is higher than the defeated of error operational amplifier
Trigger is reset when out, and the first power tube Q1 is closed under the action of start-up circuit.
Example IV
A kind of high input voltage DC-DC converter, the DC-DC converter include: loop control unit, difference sampling electricity
Road, driving circuit, the first power tube Q1, first diode D1；
The drain electrode of the first power tube Q1 of anode connection of the first diode D1；The source electrode of the first power tube Q1 connects
Ground, alternatively, the source electrode of the first power tube Q1 is grounded by a resistance R；The grid of first power tube Q1 connects the driving
Circuit；
The difference sample circuit linkloop control unit, the loop control unit connect driving circuit；
The input terminal of output voltage anode Vo+, output voltage cathode Vo- as the difference sample circuit, the difference
Result is output to loop control unit to obtain the pressure difference of setting two o'clock by sample circuit；
The loop control unit carries out the first power tube to the pressure difference data sent according to the difference sample circuit
The duty cycle adjustment of Q1, and the data result information that duty ratio modulation goes out is sent to the driving circuit；
The data result information that the driving circuit goes out to the duty ratio modulation that sends in conjunction with the loop control unit
The first power tube Q1 switch motion is driven, the pressure difference between control output voltage anode Vo+ and output voltage cathode Vo- meets defeated
The target of voltage out.
In conclusion the utility model proposes high input voltage DC-DC converter, floating gate driving unit can be saved, filled
Electric diode D2, floating ground power supply unit, system circuit design simplify, and production cost is reduced.
After the utility model improves, wafer processing technology difficulty is reduced.Since traditional scheme must have floating gate drive
Moving cell, pressure resistance is opposite to be inputted for " ground " equal to input voltage+Q1 gate driving cut-in voltage, and the circuit of this part removes
Other than high pressure resistant, it is also necessary to have a requirement of senior engineer's mould interference rejection capability and low-leakage current；And the drive of utility model scheme
Dynamic part reference point is connected with input " ground ", and the circuit highest pressure of entire control section is equal to input voltage, to preparation process
The requirement of mesohigh device creepage is also minimized.
Here the description and application of the utility model are illustrative, are not wishing to for the scope of the utility model being limited in
It states in embodiment.The deformation and change of embodiments disclosed herein be it is possible, for the ordinary skill people of those this fields
The replacement of embodiment and equivalent various parts are well known for member.It should be appreciated by the person skilled in the art that not taking off
In the case where spirit or essential characteristics from the utility model, the utility model can in other forms, structure, arrangement, ratio,
And it is realized with other components, material and component.It, can be to this in the case where not departing from the scope of the utility model and spirit
In disclosed embodiment carry out other deformations and change.
Claims (10)
1. a kind of high input voltage DC-DC converter, which is characterized in that the DC-DC converter includes: loop control unit, difference
Divide sample circuit, driving circuit, the first power tube Q1, first diode D1, inductance L, input capacitance Cin, output capacitance Cout；
The first end of the input capacitance Cin is separately connected input voltage vin, the cathode of first diode D1, output capacitance
The first end of Cout, output voltage anode Vo+, difference sample circuit；The second end of input capacitance Cin is grounded；
The anode of the first diode D1 is separately connected the drain electrode of the first end of inductance L, the first power tube Q1；The inductance L
Second end be separately connected the second end of output capacitance Cout, output voltage cathode Vo-, difference sample circuit；
The source electrode of the first power tube Q1 is grounded, alternatively, the source electrode of the first power tube Q1 passes through a resistance eutral grounding；First
The grid of power tube Q1 connects the driving circuit；
The difference sample circuit linkloop control unit, the loop control unit connect driving circuit；
The input terminal of output voltage anode Vo+, output voltage cathode Vo- as the difference sample circuit, the difference sampling
Result is output to loop control unit to obtain the pressure difference of setting two o'clock by circuit；
The loop control unit carries out the first power tube Q1's to the pressure difference data sent according to the difference sample circuit
Duty ratio modulation, and the data result information that duty ratio modulation goes out is sent to the driving circuit；
The data result information driving that the driving circuit goes out to the duty ratio modulation that sends in conjunction with the loop control unit
First power tube Q1 switch motion controls the pressure difference between output voltage anode Vo+ and output voltage cathode Vo- and meets output electricity
The target of pressure；
The loop control unit includes loop amplifier EA, reference voltage generation unit, loop compensation circuit, duty ratio modulation electricity
Road；The reference voltage generation unit is to generate reference voltage Vref；The loop amplifier EA is to calculate feedback and benchmark
Comparison result is sent to loop compensation electricity by two o'clock pressure difference compared with reference voltage Vref by the error between voltage Vref
Road；The loop compensation circuit is exported to carry out error compensation according to the comparison result of loop amplifier EA to duty ratio modulation
Circuit；The duty ratio modulation circuit obtains first to carry out duty ratio modulation according to the error compensation of loop compensation circuit
The duty cycle signals of power tube Q1 driving, and obtained duty cycle signals are exported to driving circuit；
The output of the difference sample circuit is the feedback of loop control unit, and the output of difference sample circuit is separately connected loop
The electrode input end connection reference voltage of the negative input of the second end of compensation circuit, loop amplifier EA, loop amplifier EA is raw
At the first end of unit, the second end of reference voltage generation unit is grounded；The first end linkloop of the loop compensation circuit
Output end, the duty ratio modulation circuit of amplifier EA；
The input terminal of the difference sample circuit is that output voltage anode Vo+ and output voltage cathode Vo-, difference sample circuit exist
After obtaining two o'clock pressure difference, two o'clock pressure difference is output to loop amplifier EA input terminal, loop amplifier EA is by itself and reference voltage Vref
Compare；Loop compensation circuit exports the compensation of the error compared and gives duty ratio modulation circuit, obtains the first power tube Q1 driving
Duty cycle signals；Duty ratio modulation circuit exports obtained duty cycle signals to driving circuit, and driving circuit is driven with this
First power tube Q1 switch motion controls the pressure difference between output voltage anode Vo+ and output voltage cathode Vo- and meets output electricity
The target of pressure；
The reference point of the difference sample circuit is " ground " of input voltage vin；The drive circuit of the first power tube Q1
The reference point divided is identical as " ground " of input voltage vin；
The difference sample circuit includes comparator, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4；Institute
The negative input for stating comparator is separately connected the second end of the first end of 3rd resistor R3, the 4th resistance R4；3rd resistor R3
Second end connect output voltage cathode Vo-, the 4th resistance R4 first end connection, the output end of comparator；The comparator
Electrode input end be separately connected the first end of the first end of first resistor R1, second resistance R2；The second end of first resistor R1
Connect output voltage anode Vo+, the second end ground connection of second resistance R2.
2. a kind of high input voltage DC-DC converter, which is characterized in that the DC-DC converter includes: loop control unit, difference
Divide sample circuit, driving circuit, the first power tube Q1, first diode D1, inductance L, input capacitance Cin, output capacitance Cout；
The first end of the input capacitance Cin is separately connected input voltage vin, the cathode of first diode D1, output capacitance
The first end of Cout, output voltage anode Vo+, difference sample circuit；The second end of input capacitance Cin is grounded；
The anode of the first diode D1 is separately connected the drain electrode of the first end of inductance L, the first power tube Q1；The inductance L
Second end be separately connected the second end of output capacitance Cout, output voltage cathode Vo-, difference sample circuit；
The source electrode of the first power tube Q1 is grounded, alternatively, the source electrode of the first power tube Q1 passes through a resistance eutral grounding；First
The grid of power tube Q1 connects the driving circuit；
The difference sample circuit linkloop control unit, the loop control unit connect driving circuit；
The input terminal of output voltage anode Vo+, output voltage cathode Vo- as the difference sample circuit, the difference sampling
Result is output to loop control unit to obtain the pressure difference of setting two o'clock by circuit；
The loop control unit carries out the first power tube Q1's to the pressure difference data sent according to the difference sample circuit
Duty ratio modulation, and the data result information that duty ratio modulation goes out is sent to the driving circuit；
The data result information driving that the driving circuit goes out to the duty ratio modulation that sends in conjunction with the loop control unit
First power tube Q1 switch motion controls the pressure difference between output voltage anode Vo+ and output voltage cathode Vo- and meets output electricity
The target of pressure.
3. high input voltage DC-DC converter according to claim 2, it is characterised in that:
The loop control unit includes loop amplifier EA, reference voltage generation unit, loop compensation circuit, duty ratio modulation electricity
Road；
The reference voltage generation unit is to generate reference voltage Vref；
The loop amplifier EA is to calculate the error between feedback and reference voltage Vref, by two o'clock pressure difference and reference voltage
Vref compares, and comparison result is sent to loop compensation circuit；
The loop compensation circuit is exported to carry out error compensation according to the comparison result of loop amplifier EA to duty ratio modulation
Circuit；
The duty ratio modulation circuit obtains the first function to carry out duty ratio modulation according to the error compensation of loop compensation circuit
The duty cycle signals of rate pipe Q1 driving, and obtained duty cycle signals are exported to driving circuit；
The output of the difference sample circuit is the feedback of loop control unit, and the output of difference sample circuit is separately connected loop
The electrode input end connection reference voltage of the negative input of the second end of compensation circuit, loop amplifier EA, loop amplifier EA is raw
At the first end of unit, the second end of reference voltage generation unit is grounded；The first end linkloop of the loop compensation circuit
Output end, the duty ratio modulation circuit of amplifier EA.
4. high input voltage DC-DC converter according to claim 3, it is characterised in that:
The input terminal of the difference sample circuit is that output voltage anode Vo+ and output voltage cathode Vo-, difference sample circuit exist
After obtaining two o'clock pressure difference, two o'clock pressure difference is output to loop amplifier EA input terminal, loop amplifier EA is by itself and reference voltage Vref
Compare；Loop compensation circuit exports the compensation of the error compared and gives duty ratio modulation circuit, obtains the first power tube Q1 driving
Duty cycle signals；Duty ratio modulation circuit exports obtained duty cycle signals to driving circuit, and driving circuit is driven with this
First power tube Q1 switch motion controls the pressure difference between output voltage anode Vo+ and output voltage cathode Vo- and meets output electricity
The target of pressure.
5. high input voltage DC-DC converter according to claim 3, it is characterised in that:
The source electrode of the first power tube Q1 is grounded；
The duty ratio modulation circuit includes the 5th comparator, saw-toothed wave generator, and the negative input of the 5th comparator connects
The output of error operational amplifier EA, the electrode input end of the 5th comparator connect saw-toothed wave generator, and the output end of the 5th comparator connects
Connect driving circuit.
6. high input voltage DC-DC converter according to claim 3, it is characterised in that:
The source electrode of the first power tube Q1 is grounded by a peak point current sampling resistor Rsen, duty ratio modulation circuit connection the
The source electrode of one power tube Q1 and the first end of peak point current sampling resistor Rsen, the second termination of peak point current sampling resistor Rsen
Ground；
The duty ratio modulation circuit includes the second trigger, the 4th comparator, and the negative input of the 4th comparator connects
The output end of error operational amplifier EA is connect, the electrode input end of the 4th comparator connects the first end of peak value current sampling resistor Rsen,
The output end of 4th comparator connects the second end of the second trigger；Frequency clock letter is determined in the first input end reception of second trigger
Number, the second end of the second trigger connects the output end of the 4th comparator, and the output end of the second trigger connects driving circuit.
7. high input voltage DC-DC converter according to claim 2, it is characterised in that:
The loop control unit includes first comparator, the second comparator, trigger；The source electrode of the first power tube Q1 is logical
A resistance eutral grounding is crossed, which is peak point current sampling resistor Rsen；The source electrode of first power tube Q1 connects peak value current sample
The first end of resistance Rsen, the second end ground connection of peak point current sampling resistor Rsen；
The negative input of the first comparator connects the difference sampling unit, the electrode input end connection of first comparator
Voltage reference Vref_cv, the output end of first comparator connect the first input end of the trigger；
The electrode input end of second comparator connects peak value current reference voltage Vref_ocp, and the cathode of the second comparator is defeated
Enter the source electrode of the first power tube Q1 of end connection, the first end of peak point current sampling resistor Rsen, the output end of the second comparator connects
Connect the second input terminal of the trigger；The output end of the trigger connects the driving circuit.
8. high input voltage DC-DC converter according to claim 2, it is characterised in that:
The reference point of the difference sample circuit is " ground " of input voltage vin；
The reference point of the driving circuit section of the first power tube Q1 is identical as " ground " of input voltage vin.
9. high input voltage DC-DC converter according to claim 2, it is characterised in that:
The difference sample circuit includes comparator, first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4；
The negative input of the comparator is separately connected the second end of the first end of 3rd resistor R3, the 4th resistance R4；Third
The second end of resistance R3 connects output voltage cathode Vo-, the first end connection of the 4th resistance R4, the output end of comparator；
The electrode input end of the comparator is separately connected the first end of the first end of first resistor R1, second resistance R2；First
The second end of resistance R1 connects output voltage anode Vo+, the second end ground connection of second resistance R2.
10. a kind of high input voltage DC-DC converter, which is characterized in that the DC-DC converter includes: loop control unit, difference
Divide sample circuit, driving circuit, the first power tube Q1, first diode D1；
The drain electrode of the first power tube Q1 of anode connection of the first diode D1；The source electrode of the first power tube Q1 is grounded,
Alternatively, the source electrode of the first power tube Q1 is grounded by a resistance R；The grid of first power tube Q1 connects the driving electricity
Road；
The difference sample circuit linkloop control unit, the loop control unit connect driving circuit；
The input terminal of output voltage anode Vo+, output voltage cathode Vo- as the difference sample circuit, the difference sampling
Result is output to loop control unit to obtain the pressure difference of setting two o'clock by circuit；
The loop control unit carries out the first power tube Q1's to the pressure difference data sent according to the difference sample circuit
Duty cycle adjustment, and the data result information that duty ratio modulation goes out is sent to the driving circuit；
The data result information driving that the driving circuit goes out to the duty ratio modulation that sends in conjunction with the loop control unit
First power tube Q1 switch motion controls the pressure difference between output voltage anode Vo+ and output voltage cathode Vo- and meets output electricity
The target of pressure.
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| CN108768167A (en) * | 2018-07-27 | 2018-11-06 | 深圳市必易微电子有限公司 | High input voltage DC-DC converter and its control method |
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| CN108768167A (en) * | 2018-07-27 | 2018-11-06 | 深圳市必易微电子有限公司 | High input voltage DC-DC converter and its control method |
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Address after: Room 3303, block a, block 8, block C, Wanke Yuncheng phase III, Liuxin 4th Street, Xili community, Nanshan District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Biyi Microelectronics Co., Ltd Address before: 518055 2 302, nine Xiang Ling new industrial zone, 4227 Xili Hu Road, Nanshan District, Shenzhen, Guangdong. Patentee before: SHENZHEN KIWI MICROELECTRONIC Co.,Ltd. |
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Inventor after: Zhang Bo Inventor after: Lin Guanqiu Inventor after: Yu Huijie Inventor before: Zhang Bo Inventor before: Lin Guanqiu Inventor before: Yu Huijie |
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