CN102347688B - DCDC (direct current/direct current) power supply converting and controlling device and switching power supply - Google Patents
DCDC (direct current/direct current) power supply converting and controlling device and switching power supply Download PDFInfo
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- CN102347688B CN102347688B CN201010244458.3A CN201010244458A CN102347688B CN 102347688 B CN102347688 B CN 102347688B CN 201010244458 A CN201010244458 A CN 201010244458A CN 102347688 B CN102347688 B CN 102347688B
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Abstract
The invention provides a DCDC (direct current/direct current) power supply converting and controlling device. In the process of controlling a DCDC main circuit switching tube, the device comprises a turn-off control unit, a switch-on control unit, a logic unit and a drive unit; the turn-off control unit is used for generating a discharging control signal for controlling turn-off of the switching tube in the DCDC main circuit when the current on an energy storage inductor in the DCDC main circuit reaches the preset peak current; the switch-on control unit is used for generating a charging control signal for controlling switch-on of the switching tube in the DCDC main circuit when the current on the energy storage inductor in the DCDC main circuit is reduced from the preset peak current to the preset valley current; the logic unit is used for generating a switch control signal according to the charging control signal and the discharging control signal; and the drive unit is used for controlling the switch-on and the turn-off of the switching tube in the DCDC main circuit according to the switch control signal, so that the discharging time of the inductor in the working process of the DCDC main circuit becomes the fixed value, and the stability of the system can be ensured without the need of a slope compensation module.
Description
Technical field
The present invention relates to a kind of DCDC power supply conversion control device and Switching Power Supply.
Background technology
The more and more rechargable power supplies that adopted of current portable product, need to electric quantity of power supply be discharged and be charged has good management, needs the electric weight of implementation efficiency to transform, and stable, safe and reliable management function.Because linear power supply conversion efficiency is low, the fatal shortcoming that caloric value is large all adopts the Switching Power Supply that conversion efficiency is high in a lot of schemes.Switching Power Supply conversion flexibly, has that the various structures such as BUCK, BOOST is realized step-down, the function such as boost, and can provide larger load current simultaneously, and therefore Switching Power Supply is widely used.
In Switching Power Supply control method, peak current control method has the incomparable advantage of voltage mode control method and has obtained application very widely, becomes main flow control method; Traditional peak current control method is fixed frequency, the PWM control mode of adjusting pulsewidth, such as fixed clock unlatching, peak current closing control pattern etc.But this peak current PWM control mode has intrinsic shortcoming: in the time that duty ratio is greater than 50%, the problem of circular current ring job insecurity in existing, needs the stable of slope compensation module guarantee system.
Summary of the invention
The technical problem to be solved in the present invention is: existing DCDC power supply conversion control device voltage, the unsettled problem of current ripples.
For solving the problems of the technologies described above, the embodiment of the present invention provides following technical scheme:
A kind of DCDC power supply conversion control device, in order to control a DCDC main circuit output voltage; Described DCDC power supply conversion control device comprises:
Turn-off control unit, be connected with described DCDC main circuit, when the electric current in DCDC main circuit on energy storage inductor reaches pre-set peak value electric current, produce and control the discharge control signal that in DCDC main circuit, switching tube turn-offs;
Conducting control unit, be connected with DCDC main circuit and shutoff control unit respectively, when electric current in DCDC main circuit on energy storage inductor drops to default valley point current by pre-set peak value electric current, produce the charging control signal of controlling switching tube conducting in DCDC main circuit;
Logical block, is connected with conducting control unit with described shutoff control unit respectively, in order to produce switch controlling signal according to described discharge control signal and charging control signal;
Driver element, and states logical block and is connected, in order to according to conducting and the shutoff of switching tube in described switch controlling signal control DCDC main circuit.
Further, described shutoff control unit comprises: peak current comparing unit, and in order to by the charging current detection signal of described energy storage inductor and described pre-set peak value current signal compares and according to comparative result output discharge control signal.
Further, described charging current detection signal produces by being series at the detection of first in DCDC main circuit charge circuit resistance.
Further, the variation of described pre-set peak value current signal reflection DCDC main circuit output voltage.
Further, described conducting control unit comprises: inductive discharge timing unit, be connected with shutoff control unit, and receive discharge control signal and start timing, timing, after a scheduled time, is exported charging control signal.
Further, described DCDC main circuit is voltage-dropping type power-switching circuit.
Further, described DCDC main circuit is booster type power-switching circuit.
Further, described DCDC main circuit is buck-boost type power-switching circuit.
Further, described logical block is rest-set flip-flop.
The present invention also provides the Switching Power Supply that comprises above-mentioned DCDC power supply conversion control device.
A kind of DCDC power supply conversion control device provided by the present invention, in to the process of DCDC main circuit switch management and control system, turn-off control unit, when electric current in DCDC main circuit on energy storage inductor reaches pre-set peak value electric current, produce and control the discharge control signal that in DCDC main circuit, switching tube turn-offs; Conducting control unit, when the electric current in DCDC main circuit on energy storage inductor drops to default valley point current by pre-set peak value electric current, produces the charging control signal of controlling switching tube conducting in DCDC main circuit; Make thus become fixed value the discharge time of inductance in the DCDC main circuit course of work, do not need slope compensation module just can ensure the stable of system.
Brief description of the drawings
Fig. 1 is the theory diagram of the embodiment of the present invention one;
Fig. 2 is the DCDC main circuit diagram of the embodiment of the present invention two;
Fig. 3 is the theory diagram of the shutoff control unit of the embodiment of the present invention two;
Fig. 4 is the circuit diagram that the peak current of the embodiment of the present invention two is set;
Fig. 5 is the circuit diagram of the inductive discharge timing unit of the embodiment of the present invention two;
Fig. 6 is the circuit diagram of the embodiment of the present invention two logical blocks;
Fig. 7 is the DCDC main circuit diagram of the embodiment of the present invention three;
Fig. 8 is the theory diagram of the shutoff control unit of the embodiment of the present invention three;
Fig. 9 is the circuit diagram that the peak current of the embodiment of the present invention three is set;
Figure 10 is the circuit diagram of the inductive discharge timing unit of the embodiment of the present invention three;
Figure 11 is the circuit diagram of the embodiment of the present invention three logical blocks;
Embodiment
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Embodiment mono-:
Fig. 1 is the theory diagram of the embodiment of the present invention; A kind of DCDC power supply conversion control device 10 as shown in Figure 1, in order to control DCDC main circuit 20 output voltages; Described DCDC power supply conversion control device comprises: turn-off control unit, be connected with described DCDC main circuit, when the electric current in DCDC main circuit on energy storage inductor reaches pre-set peak value electric current, produce and control the discharge control signal that in DCDC main circuit, switching tube turn-offs; Conducting control unit, be connected with DCDC main circuit and shutoff control unit respectively, when electric current in DCDC main circuit on energy storage inductor drops to default valley point current by pre-set peak value electric current, produce the charging control signal of controlling switching tube conducting in DCDC main circuit; Logical block, is connected with conducting control unit with described shutoff control unit respectively, in order to produce switch controlling signal according to described discharge control signal and charging control signal; Driver element, and states logical block and is connected, in order to according to conducting and the shutoff of switching tube in described switch controlling signal control DCDC main circuit.
Wherein, described shutoff control unit is specially peak current comparing unit, in order to by the charging current detection signal of described energy storage inductor and a pre-set peak value current signal compares and according to comparative result output discharge control signal.
Wherein, described charging current detection signal produces by being series at the detection of first in DCDC main circuit charge circuit resistance.
Wherein, the variation of described pre-set peak value current signal reflection DCDC main circuit output voltage, the constant voltage of for example exporting taking DCDC main circuit is as default peak-current signal.
Wherein, described conducting control unit comprises: inductive discharge timing unit, be connected with shutoff control unit, and receive discharge control signal and start timing, timing, after a scheduled time, is exported charging control signal.
Embodiment bis-
Embodiment bis-is on the basis of embodiment mono-, taking controlled hypotension type DCDC main circuit as example, the present invention is further described:
Fig. 2 is the DCDC main circuit diagram of the embodiment of the present invention two; Be specially voltage-dropping type DCDC power-switching circuit, mainly formed by switching tube Q1, inductance L 1, capacitor C 1, continued flow tube; Wherein switching tube Q1 is PMOS pipe, and its source electrode meets direct voltage VCC through resistance R sen, and at this resistance R sen, in order to detect the charging current of inductance L 1, the node between resistance R sen and switching tube Q1 is exported charging current detection signal Vsen; Switching tube Q1 drain electrode is connected to the ground through continued flow tube; Wherein DRV is the control end of switching tube Q1; One end of inductance L 1 is connected between switching tube Q1 and continued flow tube, and the other end of inductance L 1 is connected with a pole plate of capacitor C 1, and another pole plate of capacitor C 1 is connected to the ground.
Fig. 3 is the theory diagram of the shutoff control unit of the embodiment of the present invention two; Described shutoff control unit is specially peak current comparing unit CI, in order to the charging current detection signal Vsen of described energy storage inductor and a pre-set peak value current signal V_PEAK_SET are compared, in the time that both are equal, inductive current reaches the peak current I_PEAK setting, peak current comparing unit output discharge control signal PEAK_OK.
Fig. 4 is the circuit diagram that the peak current of the embodiment of the present invention two is set; It comprises operational amplifier OPA1, nmos switch pipe Q2, resistance R 2, the first input end of operational amplifier OPA1 is connected with output voltage feedback signal Vset, the variation of output voltage feedback signal Vset reflection DCDC main circuit output voltage, for example, set pre-set peak value current signal with the voltage VOUT of DCDC main circuit output; The second input of operational amplifier OPA1 is connected with the source electrode of switching tube Q2, the source electrode of switching tube Q2 is also connected to the ground through resistance R 2, the drain electrode of switching tube Q2 is connected with VCC through current source I1, hence one can see that, and operational amplifier OPA1 and switching tube Q2 form a source follow circuit, and form a constant-current source I1 with resistance R 2, the proportional current A*I1 that pre-set peak value current signal V_PEAK_SET deducts I1 for VCC the poor of pressure drop that resistance R set produces of flowing through, A is greater than 0 proportionality constant, can adjust according to actual needs.
Fig. 5 is the circuit diagram of the inductive discharge timing unit of the embodiment of the present invention two; It comprises operational amplifier OPA2, nmos switch pipe Q3, resistance R 3, the first input end of operational amplifier OPA2 is connected with the pressure reduction at afterflow state DCDC main circuit inductance two ends, equals DCDC main circuit output voltage VO UT for the pressure reduction at step-down DCDC power-switching circuit afterflow state DCDC main circuit inductance two ends;
In the present embodiment, the reality of the first input end access of operational amplifier OPA2 is B*VOUT, and B is greater than 0 proportionality constant, can adjust according to actual needs; The second input of operational amplifier is connected with the source electrode of switching tube Q3, the source electrode of switching tube Q3 is also connected to the ground through resistance R 3, the drain electrode of switching tube Q3 is connected with VCC through current source I2, hence one can see that, and operational amplifier OPA2 and switching tube Q3 form a source follow circuit, and form a constant-current source I2 with resistance R 3; Inductive discharge timing unit also comprises comparator C OMP1, capacitor C 2, and the first input end of comparator C OMP1 is connected with the proportional current E*I2 of I2 through switch S 1, and E is greater than 0 proportionality constant, can adjust according to actual needs; The first input end of comparator C OMP1 is also connected to the ground through switch S 2, and a pole plate of capacitor C 2 is connected between what switch S 2 of first input end of comparator C OMP1, and another pole plate of capacitor C 2 is connected to the ground; In the time that inductive current reaches peak value, turn-off control unit and produce the discharge control signal PEAK_OK that controls switching tube shutoff in DCDC main circuit, now discharge control signal PEAK_OK is converted to the timing triggering signal T of inductive discharge timing unit through logical process
oFF_ START, control switch S1 conducting, switch S 2 is closed, proportional current E*I2 starts capacitor C 2 to charge, in the time that in capacitor C 2, voltage V_CAL reaches reference voltage V REF_CAL, illustrate that inductive current reaches default valley point current, the charging control signal T of switching tube conducting in DCDC main circuit is controlled in comparator C OMP1 output
oFF_ OVER;
Fig. 6 is the circuit diagram of the embodiment of the present invention two logical blocks; It is specially a rest-set flip-flop, R termination discharge control signal PEAK_OK, S termination charging control signal T
oFF_ OVER, Q end is connected with the control end of switching tube in DCDC main circuit, and Q is counter to be held, output timing triggering signal T
oFF_ START, T
oFF_ START and T
oFFthe time difference of _ OVER is the scheduled time of inductive discharge timing unit.
Embodiment tri-
Embodiment tri-is on the basis of embodiment mono-, to control step-up DC/DC main circuit as example, the present invention is further described:
Fig. 7 is the DCDC main circuit diagram of the embodiment of the present invention three; Be specially voltage-dropping type DCDC power-switching circuit, mainly formed by switching tube Q4, inductance L 2, capacitor C 3, continued flow tube; Wherein switching tube Q4 is NMOS pipe, and its source electrode is through resistance R sen1 ground connection, and at this resistance R sen1, in order to detect the charging current of inductance L 2, the node between resistance R sen1 and switching tube Q4 is exported charging current detection signal Vsen1; Switching tube Q4 drain electrode meets power supply VCC through inductance L 2, and wherein DRV1 is the control end of switching tube Q4; One end of continued flow tube is connected between switching tube Q4 and inductance L 2, and the other end of continued flow tube is connected with a pole plate of capacitor C 3, and another pole plate of capacitor C 3 is connected to the ground.
Fig. 8 is the theory diagram of the shutoff control unit of the embodiment of the present invention three; Described shutoff control unit is specially peak current comparing unit CI1, in order to the charging current detection signal Vsen1 of described energy storage inductor and a pre-set peak value current signal V_PEAK_SET1 are compared, in the time that both are equal, inductive current reaches the peak current I_PEAK1 setting, peak current comparing unit output discharge control signal PEAK_OK1.
Fig. 9 is the circuit diagram that the peak current of the embodiment of the present invention three is set; It comprises operational amplifier OPA3, nmos switch pipe Q5, resistance R 4, the first input end of operational amplifier OPA1 is connected with output voltage feedback signal Vset1, output voltage feedback signal Vset1 reflection DCDC main circuit output voltage volume changes, for example, set pre-set peak value current signal with the voltage VOUT of DCDC main circuit output; The second input of operational amplifier OPA3 is connected with the source electrode of switching tube Q5, the source electrode of switching tube Q5 is also connected to the ground through resistance R 4, the drain electrode of switching tube Q4 is connected with VCC through current source I3, hence one can see that, and operational amplifier OPA3 and switching tube Q5 form a source follow circuit, and form a constant-current source I3 with resistance R 4, V_PEAK_SET1 is the proportional current C*I3 pressure drop that resistance R set1 produces of flowing through, and C is greater than 0 proportionality constant, can adjust according to actual needs.
Figure 10 is the circuit diagram of the inductive discharge timing unit of the embodiment of the present invention three; Pressure reduction for boost DC/DC power-switching circuit afterflow state DCDC main circuit inductance two ends equals the poor of DCDC main circuit output voltage VO UT and input voltage VIN;
The circuit of inductive discharge timing unit comprises operational amplifier OPA4, nmos switch pipe Q6, resistance R 5, the first input end of operational amplifier OPA4 is connected with afterflow state DCDC main circuit output voltage, in the present embodiment, the reality of the first input end access of operational amplifier OPA4 is that F*VOUT F is greater than 0 proportionality constant, can adjust according to actual needs; The second input of operational amplifier OPA4 is connected with the source electrode of switching tube Q6, the source electrode of switching tube Q6 is also connected to the ground through resistance R 5, the drain electrode of switching tube Q6 is connected with VCC through current source I4, hence one can see that, and operational amplifier OPA4 and switching tube Q6 form a source follow circuit, and form a constant-current source I4 with resistance R 5;
The circuit of inductive discharge timing unit also comprises operational amplifier OPA5, nmos switch pipe Q7, resistance R 6, the first input end of operational amplifier OPA5 is connected with main circuit input voltage, in the present embodiment, the reality of the first input end access of operational amplifier OPA4 is G*VIN, G is greater than 0 proportionality constant, can adjust according to actual needs; The second input of operational amplifier OPA5 is connected with the source electrode of switching tube Q7, the source electrode of switching tube Q7 is also connected to the ground through resistance R 6, the drain electrode of switching tube Q7 is connected with VCC through current source I5, hence one can see that, and operational amplifier OPA5 and switching tube Q7 form a source follow circuit, and form a constant-current source I5 with resistance R 6;
Inductive discharge timing unit also comprises comparator C OMP2, capacitor C 4, and the first input end of comparator C OMP2 is connected with the proportional current H*I6 of I6 through switch S 10, and H is greater than 0 proportionality constant, can adjust according to actual needs; Wherein I6=I5-I4; The first input end of comparator C OMP2 is also connected to the ground through switch S 20, and a pole plate of capacitor C 4 is connected between the first input end and switch S 20 of comparator C OMP2, and another pole plate of capacitor C 4 is connected to the ground; In the time that inductive current reaches peak value, turn-off control unit and produce the discharge control signal PEAK_OK1 that controls switching tube shutoff in DCDC main circuit, now discharge control signal PEAK_OK1 is converted to the timing triggering signal T of inductive discharge timing unit through logical process
oFF_ START1, control switch S10 conducting, switch S 20 is closed, proportional current H*I6 starts capacitor C 4 to charge, in the time that in capacitor C 4, voltage V_CAL1 reaches reference voltage V REF_CAL1, illustrate that inductive current reaches default valley point current, the charging control signal T of switching tube conducting in DCDC main circuit is controlled in comparator C OMP2 output
oFF_ OVER1;
Figure 11 is the circuit diagram of the embodiment of the present invention three logical blocks; It is specially a rest-set flip-flop, R termination discharge control signal PEAK_OK1, S termination charging control signal T
oFF_ OVER1, Q end is connected with the control end DRV1 of switching tube in DCDC main circuit, the anti-output timing triggering signal T that holds of Q
oFF_ START1, T
oFF_ START1 and T
oFFthe time difference of _ OVER1 is the scheduled time of inductive discharge timing unit.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (9)
1. a DCDC power supply conversion control device, in order to control a DCDC main circuit output voltage; It is characterized in that: described DCDC power supply conversion control device comprises:
Turn-off control unit, be connected with described DCDC main circuit, when the electric current in DCDC main circuit on energy storage inductor reaches pre-set peak value electric current, produce and control the discharge control signal that in DCDC main circuit, switching tube turn-offs;
Conducting control unit, be connected with DCDC main circuit and shutoff control unit respectively, when electric current in DCDC main circuit on energy storage inductor drops to default valley point current by pre-set peak value electric current, produce the charging control signal of controlling switching tube conducting in DCDC main circuit, described conducting control unit comprises: inductive discharge timing unit, be connected with judging control unit, receive discharge control signal and start timing, timing is after a scheduled time, output charging control signal, described inductive discharge timing unit comprises operational amplifier, nmos switch pipe, resistance, the first input end of operational amplifier is connected with DCDC main circuit output voltage, the second input of operational amplifier is connected with the source electrode of switching tube, the source electrode of switching tube is connected to the ground through resistance, the drain electrode of switching tube is connected with DC power supply through current source,
Logical block, is connected with conducting control unit with described shutoff control unit respectively, in order to produce switch controlling signal according to described discharge control signal and charging control signal;
Driver element, is connected with described logical block, in order to according to conducting and the shutoff of switching tube in described switch controlling signal control DCDC main circuit.
2. DCDC power supply conversion control device according to claim 1, it is characterized in that: described shutoff control unit comprises: peak current comparing unit, in order to by the charging current detection signal of described energy storage inductor and described pre-set peak value current signal compares and according to comparative result output discharge control signal.
3. DCDC power supply conversion control device according to claim 2, is characterized in that: described charging current detection signal produces by being series at the detection of first in DCDC main circuit charge circuit resistance.
4. DCDC power supply conversion control device according to claim 2, is characterized in that: the variation of described pre-set peak value current signal reflection DCDC main circuit output voltage.
5. DCDC power supply conversion control device according to claim 1, is characterized in that: described DCDC main circuit is voltage-dropping type power-switching circuit.
6. DCDC power supply conversion control device according to claim 1, is characterized in that: described DCDC main circuit is booster type power-switching circuit.
7. DCDC power supply conversion control device according to claim 1, is characterized in that: described DCDC main circuit is buck-boost type power-switching circuit.
8. DCDC power supply conversion control device according to claim 1, is characterized in that: described logical block is rest-set flip-flop.
9. a Switching Power Supply, is characterized in that: comprise the DCDC power supply conversion control device described in claim 1 to 8 any one.
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| CN201010244458.3A CN102347688B (en) | 2010-07-29 | 2010-07-29 | DCDC (direct current/direct current) power supply converting and controlling device and switching power supply |
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| CN201010244458.3A CN102347688B (en) | 2010-07-29 | 2010-07-29 | DCDC (direct current/direct current) power supply converting and controlling device and switching power supply |
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| CN102347688B true CN102347688B (en) | 2014-12-10 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103312169A (en) * | 2013-06-28 | 2013-09-18 | 电子科技大学 | Direct current (DC)-DC converter with adjustable inductor discharging slope |
| CN104348475B (en) * | 2013-07-26 | 2018-03-20 | 无锡华润矽科微电子有限公司 | A kind of power supply anti-jamming circuit and its method |
| US10148260B2 (en) * | 2015-06-12 | 2018-12-04 | Infineon Technologies Ag | Pulse-density modulated fast current controller |
| US10784783B1 (en) | 2020-01-06 | 2020-09-22 | Nxp B.V. | Charge-cycle control for burst-mode DC-DC converters |
| US11038427B1 (en) | 2020-01-06 | 2021-06-15 | Nxp B.V. | Charge-cycle control for burst-mode DC-DC converters |
| WO2021226978A1 (en) * | 2020-05-15 | 2021-11-18 | 深圳市汇顶科技股份有限公司 | Power supply management circuit, chip, and device |
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Effective date of registration: 20200108 Address after: 518119 1 Yanan Road, Kwai Chung street, Dapeng New District, Shenzhen, Guangdong Patentee after: SHENZHEN BYD MICROELECTRONICS Co.,Ltd. Address before: BYD 518118 Shenzhen Road, Guangdong province Pingshan New District No. 3009 Patentee before: BYD Co.,Ltd. |
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Address after: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee after: BYD Semiconductor Co.,Ltd. Address before: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee before: BYD Semiconductor Co.,Ltd. Address after: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee after: BYD Semiconductor Co.,Ltd. Address before: 518119 No.1 Yan'an Road, Kuiyong street, Dapeng New District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN BYD MICROELECTRONICS Co.,Ltd. |