CN102244463A - Real-time adjustable zero current detector used for switching type regulator and detection method - Google Patents
Real-time adjustable zero current detector used for switching type regulator and detection method Download PDFInfo
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- CN102244463A CN102244463A CN2010101723584A CN201010172358A CN102244463A CN 102244463 A CN102244463 A CN 102244463A CN 2010101723584 A CN2010101723584 A CN 2010101723584A CN 201010172358 A CN201010172358 A CN 201010172358A CN 102244463 A CN102244463 A CN 102244463A
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Abstract
The invention discloses a real-time adjustable zero current detector used for a switching type regulator. The real-time adjustable zero current detector is used for providing zero current signals for the switching type regulator and can monitor the condition of a switching node after a lower bridge power switch is closed so that the detection threshold of the zero current is optimized, and the green mode efficiency can be increased. The switching type regulator comprises an upper bridge switch which is connected with the lower bridge power switch through the switching node. The detector comprises a feedback loop connected with the switching node and a comparator connected with the feedback loop and the switching node, wherein the feedback loop monitors the condition of the switching node after the lower bridge power switch is closed so that the detection threshold of the zero current is optimized; and the comparator is used for comparing the voltage of the switching node and the detection threshold of the zero current so as to trigger the zero current signals. The real-time adjustable zero current detector is characterized in that the detection method comprises the steps of: monitoring the condition of the switching node after the lower bridge power switch is closed so that the detection threshold of the zero current is optimized; and comparing the voltage of the switching node and the detection threshold of the zero current so that the zero current signals are tiggered.
Description
Technical field
The present invention relates to a kind of suitching type adjuster, particularly about a kind of (being meanings such as " immediately ", " at once ", " at once " in real time) in real time adjustable zero current detector and method for detecting that is used for the suitching type adjuster.
Background technology
The suitching type adjuster detects zero current to cut out bridge power switch down under green pattern, avoid the reciprocal inductance electric current to cause extra loss in efficiency.Existing zero current detecting, for example U.S. Patent number 7,327,127, be when the voltage of switching node reaches door, to trigger zero current signal, to close (turn off) bridge power switch down, yet this zero current detecting door is just fixing when design, when the characteristic of part assembly not simultaneously, for example skew of comparator (offset) and delay and last bridge or the factors such as impedance of bridge power switch down, cause and close down the bridge power switch too early or excessively evening, thus can not optimization the efficient of green pattern.
Summary of the invention
Purpose of the present invention is to propose a kind of Adjustable real-time zero current detector and method for detecting that is used for the suitching type adjuster.
According to the present invention, a kind of Adjustable real-time zero current detector that is used for the suitching type adjuster, comprise that feedback loop closes the back at following bridge power switch and monitor the switching node state with optimization zero current detecting door, and comparator relatively the voltage of this switching node and this zero current detecting door to trigger zero current signal.
According to the present invention, a kind of Adjustable real-time zero current method for detecting that is used for the suitching type adjuster, be included in down the bridge power switch and close back supervision switching node state, and relatively voltage and this zero current of this switching node are detected door to trigger zero current signal with optimization zero current detecting door.
The present invention adjusts zero current detecting door in real time by monitoring the switching node state, and avoid too early or close down the bridge power switch excessively evening, and then the efficient of optimization green pattern.
Description of drawings
Fig. 1 is the circuit diagram of the first embodiment of the present invention;
Fig. 2 is the oscillogram of the suitching type adjuster of Fig. 1;
Fig. 3 is the embodiment that decides rising signals and dropping signal with two sampling values;
Fig. 4 is the embodiment that decides rising signals and dropping signal with three sampling values;
Fig. 5 is the circuit diagram of the second embodiment of the present invention;
Fig. 6 is the oscillogram of the suitching type adjuster of Fig. 5;
Fig. 7 is the circuit diagram of the third embodiment of the present invention;
Fig. 8 is the oscillogram of the suitching type adjuster of Fig. 7;
Fig. 9 is the circuit diagram of the fourth embodiment of the present invention; And
Figure 10 is the oscillogram of the suitching type adjuster of Fig. 9.
Embodiment
Below in conjunction with Figure of description the specific embodiment of the present invention is done detailed description.
Fig. 1 is the circuit diagram of the first embodiment of the present invention, the suitching type adjuster has last bridge switch M1 and connects bridge power switch M2 down through switching node 10, controller chip 12 provides bridge switch M1 and following bridge power switch M2 in control signal Vug and the Vlg switching, to produce inductive current IL capacitor C L charging is produced output voltage V o, voltage divider resistance R 1 and R2 produce output voltage V o dividing potential drop feedback signal VFB and give controller chip 12, compensating network 14 compensation feedback signal VFB.In controller chip 12, pwm control logic 16 provides pulse-width modulation signal PWM to driver 18 and 20, produce control signal Vug and Vlg according to this, zero current detector 22 comprises feedback loop 24 and comparator 26, feedback loop 24 monitors the switching node state after bridge power switch M2 closes down, with optimization zero current detecting door Vzc, comparator 26 is the voltage Vx and the zero current detecting door Vzc of switching node 10 relatively, give driver 20 to trigger zero current signal ZC, make it close down bridge power switch M2.In feedback loop 24, comparator 28 comparative voltage Vx and reference voltage Vr produce comparison signal Sc, pulse generator 30 detecting control signal Vlg, start pulse signal Sp when bridge power switch M2 closes down, and then make control logic 32 sampling comparison signal Sc, and according to sampling result decision rising signals U and dropping signal D, N position up-down counter 34 increases or reduces the count value CNT of its output according to rising signals U and dropping signal D, digital analog converter 36 is converted to aanalogvoltage Vzc ' with count value CNT, and buffer 38 produces zero current detecting door Vzc according to aanalogvoltage Vzc '.
Fig. 2 is the oscillogram of the suitching type adjuster of Fig. 1.With reference to Fig. 1 and Fig. 2, as waveform 40 shown in the time t1, when voltage Vx rises to when being higher than zero current detecting door Vzc, control signal Vlg transfers low level to shown in waveform 42, thereby close down bridge power switch M2, make pulse generator 30 start pulse signal Sp simultaneously shown in waveform 44, thereby control logic 32 is taken a sample to comparing signal Sc at time t2, since this moment voltage Vx greater than reference voltage Vr shown in waveform 40, therefore the sampling result that obtains is " 1 ", and then to cause rising signals U be high levle, dropping signal D is a low level, make count value CNT by " 01101 " rise to " 01110 " shown in rectangular 46, thereby reduce zero current detecting door Vzc.Opposite, when sampling result be " 0 " time, shown in time t3, will cause rising signals U is low level, dropping signal D is a high levle, make count value CNT by " 01110 " drop to " 01101 ", therefore improve zero current and detect door Vzc.
In the embodiment of Fig. 2,32 of control logics decide rising signals U and dropping signal D with a sampling value, can decide rising signals U and dropping signal D with more a plurality of sampling values in other embodiments, for example Fig. 3 is control logic 32 decides rising signals U and dropping signal D with two sampling values embodiment.In Fig. 3 A, the voltage Vx of two sampling time point SH1 and SH2 is during all less than reference voltage Vr, so control logic 32 obtains sampling result " 00 ", causing rising signals U is low level, dropping signal D is a high levle, and then improves zero current detecting door Vzc.In Fig. 3 B, the voltage Vx of first sampling time point SH1 is less than reference voltage Vr, voltage Vx during second sampling time point SH2 is greater than reference voltage Vr, therefore control logic 32 obtains sampling result " 01 ", causing rising signals U and dropping signal D all is low level, thereby zero current detecting door Vzc will remain unchanged.In Fig. 3 C, the voltage Vx of two sampling time point SH1 and SH2 is all greater than reference voltage Vr, so control logic 32 obtains sampling result " 11 ", thereby rising signals U is high levle, dropping signal D is a low level, and then reduces zero current detecting door Vzc.
Fig. 4 is control logic 32 decides rising signals U and dropping signal D with three sampling values embodiment.In Fig. 4 A, the voltage Vx of three sampling time point SH1, SH2 and SH3 is all less than reference voltage Vr, so control logic 32 obtains sampling result " 000 ", causing rising signals U is low level, dropping signal D is a high levle, makes zero current detecting door Vzc improve.In Fig. 4 B, the voltage Vx of first and second sampling time point SH1 and SH2 is less than reference voltage Vr, voltage Vx during the 3rd sampling time point SH3 is greater than reference voltage Vr, therefore control logic 32 obtains sampling result " 001 ", causing rising signals U and dropping signal D all is low level, and zero current is detected door Vzc thereby remained unchanged.In Fig. 4 C, the voltage Vx of three sampling time point SH1, SH2 and SH3 is all greater than reference voltage Vr, so control logic 32 obtains sampling result " 111 ", causing rising signals U is high levle, dropping signal D is a low level, makes zero current detecting door Vzc reduce.
Fig. 5 is the circuit diagram of the second embodiment of the present invention, and except feedback loop 24 had the part difference, all the other were identical with the embodiment of Fig. 1.In this embodiment, pulse generator 30 detecting control signal Vlg, start pulse signal Sp when bridge power switch M2 closes down, and then make sampling and holding circuit 48 sampling voltage Vx and produce sampled signal LXF, comparator 28 is sampled signal LXF and reference voltage Vr generation comparison signal Sc relatively, and N position up-down counter 34 increases or reduce the count value CNT that it is exported according to comparison signal Sc.Other circuit and running thereof are identical with the embodiment of Fig. 1.
Fig. 6 is the oscillogram of the suitching type adjuster of Fig. 5.With reference to Fig. 5 and Fig. 6, as waveform 40 shown in the time t4, when voltage Vx rises to when being higher than zero current detecting door Vzc, control signal Vlg transfers low level to shown in waveform 42, thereby close down bridge power switch M2, make pulse generator 30 start pulse signal Sp simultaneously shown in waveform 44, thereby sampling and holding circuit 48 are taken a sample to voltage Vx at time t5, since this moment voltage Vx greater than reference voltage Vr shown in waveform 40, therefore the sampled signal LXF that obtains also greater than reference voltage Vr shown in waveform 50, the output Sc that causes comparator 28 is a high levle, and then make N position up-down counter 34 with count value CNT by " 01101 " rise to " 01110 " shown in rectangular 46, thereby reduce zero current detecting door Vzc.Opposite, when sampled signal LXF was lower than reference voltage Vr, shown in time t6, the output Sc of comparator 28 was a low level, therefore N position up-down counter 34 with count value CNT by " 01110 " drop to " 01101 ", therefore improve zero current detecting door Vzc.
Fig. 7 is the circuit diagram of the third embodiment of the present invention, and it is that the digital circuit that will produce aanalogvoltage Vzc ' among Fig. 1 changes the analog circuit realization into.In this embodiment, rising signals U that control logic 32 provides and dropping signal L are used for controlling 52 couples of capacitor C zc of charge-discharge circuit and discharge and recharge, to produce aanalogvoltage Vzc '.In charge-discharge circuit 52, first current source, 54 decision charging current Iu, charge switch SW1 is connected between first current source 54 and the capacitor C zc, second current source, 56 decision discharging current Id, discharge switch SW2 is connected between the capacitor C zc and second current source 56.When rising signals U was high levle, dropping signal L was a low level, and charge switch SW1 opens (turn on), and discharge switch SW2 closes, and charging current Iu is to capacitor C zc charging, so aanalogvoltage Vzc ' rising.When decline signal L was high levle, rising signals U was a low level, and charge switch SW1 closes, and discharge switch SW2 opens, and discharging current Id makes capacitor C zc discharge, so aanalogvoltage Vzc ' decline.
Fig. 8 is the oscillogram of the suitching type adjuster of Fig. 7.With reference to Fig. 7 and Fig. 8, as waveform 40 shown in the time t7, when voltage Vx rises to when being higher than zero current detecting door Vzc, control signal Vlg transfers low level to shown in waveform 42, thereby close down bridge power switch M2, make pulse generator 30 start pulse signal Sp simultaneously shown in waveform 44, thereby control logic 32 is taken a sample to comparing signal Sc at time t8, if voltage Vx is greater than reference voltage Vr during sampling, shown in waveform 40, then sampling result is " 1 ", control logic 32 triggers the rising signals U with fixed pulse width, therefore open charge switch SW1 and make capacitor C zc charging, cause aanalogvoltage Vzc ' rising shown in waveform 58, and then reduce zero current detecting door Vzc.Opposite, if voltage Vx is less than reference voltage Vr during control logic 32 samplings, as waveform 40 shown in the time t9, then sampling result is " 0 ", control logic 32 triggers the dropping signal L with fixed pulse width, therefore open discharge switch SW2 and make capacitor C zc discharge, cause aanalogvoltage Vzc ' decline shown in waveform 58, and then improve zero current detecting door Vzc.In the embodiment of Fig. 8,32 of control logics decide rising signals U and dropping signal L with a sampling value, can decide rising signals U and dropping signal L with more a plurality of sampling values in other embodiments, example embodiment as shown in Figures 3 and 4.
Fig. 9 is the circuit diagram of the fourth embodiment of the present invention, and it is that the digital circuit that will produce aanalogvoltage Vzc ' among Fig. 5 changes the analog circuit realization into.In this embodiment, comparator 28 produces first and second comparison signal Scu and Scd inverting each other according to the result who compares sampled signal LXF and reference voltage Vr, is used for controlling 52 couples of capacitor C zc of charge-discharge circuit and discharges and recharges, to produce aanalogvoltage Vzc '.When the first comparison signal Scu was high levle, the second comparison signal Scd was a low level, and charge switch SW1 opens, and discharge switch SW2 closes, and charging current Iu is to capacitor C zc charging, so aanalogvoltage Vzc ' rising.When the second comparison signal Scd was high levle, the first comparison signal Scu was a low level, and charge switch SW1 closes, and discharge switch SW2 opens, and discharging current Id makes capacitor C zc discharge, so aanalogvoltage Vzc ' decline.
Figure 10 is the oscillogram of the suitching type adjuster of Fig. 9.With reference to Fig. 9 and Figure 10, as waveform 40 shown in the time t10, when voltage Vx rises to when being higher than zero current detecting door Vzc, control signal Vlg transfers low level to shown in waveform 42, thereby close down bridge power switch M2, make pulse generator 30 start pulse signal Sp simultaneously shown in waveform 44, make sampling and holding circuit 48 produce sampled signal LXF to voltage Vx sampling at time t11, if sampled signal LXF is greater than reference voltage Vr, shown in the waveform 50 at time t11 place, then comparator 28 triggers the comparison signal Scu with fixed pulse width, therefore open charge switch SW1 and make capacitor C zc charging, cause aanalogvoltage Vzc ' raising shown in waveform 58, and then reduce zero current detecting door Vzc.Opposite, if sampled signal LXF is less than reference voltage Vr, as waveform 50 shown in the time t12, then comparator 28 triggers the comparison signal Scd with fixed pulse width, therefore open discharge switch SW2 and make capacitor C zc discharge, cause aanalogvoltage Vzc ' decline shown in waveform 58, and then improve zero current detecting door Vzc.
More than; only be preferred embodiment of the present invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range that claim was defined.
Claims (12)
1. Adjustable real-time zero current detector that is used for the suitching type adjuster, this suitching type adjuster comprise bridge switch and connect bridge power switch down through switching node, it is characterized in that this detector comprises:
Feedback loop connects this switching node, closes the back at this time bridge power switch and monitors that the switching node state is with optimization zero current detecting door; And
Comparator connects this feedback loop and switching node, and relatively the voltage of this switching node and this zero current detecting door is to trigger zero current signal.
2. the Adjustable real-time zero current detector that is used for the suitching type adjuster as claimed in claim 1 is characterized in that this feedback loop comprises:
Second comparator connects this switching node, and relatively the voltage of this switching node and reference voltage are to produce comparison signal;
Start pulse signal when pulse generator is closed at this time bridge power switch;
Control logic connects this second comparator and pulse generator, in response to this pulse signal this comparison signal of taking a sample, and according to sampling result decision rising signals and dropping signal;
Up-down counter connects this control logic, increases or reduce the count value of its output according to this rising signals and dropping signal;
Digital analog converter connects this up-down counter, and this count value is converted to aanalogvoltage; And
Buffer connects this digital analog converter, produces this zero current detecting door according to this aanalogvoltage.
3. the Adjustable real-time zero current detector that is used for the suitching type adjuster as claimed in claim 1 is characterized in that this feedback loop comprises:
Pulse generator, start pulse signal when this time bridge power switch is closed;
Sampling and holding circuit connect this switching node and pulse generator, take a sample the voltage of this switching node to produce sampled signal in response to this pulse signal;
Second comparator connects this sampling and holding circuit, relatively this sampled signal and reference voltage and produce comparison signal;
Up-down counter connects this second comparator, increases or reduce the count value of its output according to this comparison signal;
Digital analog converter connects this up-down counter, and this count value is converted to aanalogvoltage; And
Buffer connects this digital analog converter, produces this zero current detecting door according to this aanalogvoltage.
4. the Adjustable real-time zero current detector that is used for the suitching type adjuster as claimed in claim 1 is characterized in that this feedback loop comprises:
Second comparator connects this switching node, and relatively the voltage of this switching node and reference voltage are to produce comparison signal;
Start pulse signal when pulse generator is closed at this time bridge power switch;
Control logic connects this second comparator and pulse generator, in response to this pulse signal this comparison signal of taking a sample, and according to sampling result decision rising signals and dropping signal;
Electric capacity;
Charge-discharge circuit connects this control logic and electric capacity, to these electric capacity charge or discharge, thereby produces aanalogvoltage according to this rising signals and dropping signal; And
Buffer connects this electric capacity, produces this zero current detecting door according to this aanalogvoltage.
5. the Adjustable real-time zero current detector that is used for the suitching type adjuster as claimed in claim 4 is characterized in that this charge-discharge circuit comprises:
First current source;
Charge switch is connected between this first current source and the electric capacity, opens in response to this rising signals, so that this first current source is to this electric capacity charging;
Second current source; And
Discharge switch is connected between this second current source and the electric capacity, opens in response to this dropping signal, so that this second current source is to this capacitor discharge.
6. the Adjustable real-time zero current detector that is used for the suitching type adjuster as claimed in claim 1 is characterized in that this feedback loop comprises:
Pulse generator, start pulse signal when this time bridge power switch is closed;
Sampling and holding circuit connect this switching node and pulse generator, take a sample the voltage of this switching node to produce sampled signal in response to this pulse signal;
Second comparator connects this sampling and holding circuit, relatively this sampled signal and reference voltage and produce first and second comparison signal;
Electric capacity;
Charge-discharge circuit connects this second comparator and electric capacity, to these electric capacity charge or discharge, thereby produces aanalogvoltage according to this first and second comparison signal; And
Buffer connects this digital analog converter, produces this zero current detecting door according to this aanalogvoltage.
7. the Adjustable real-time zero current detector that is used for the suitching type adjuster as claimed in claim 6 is characterized in that this charge-discharge circuit comprises:
First current source;
Charge switch is connected between this first current source and the electric capacity, opens in response to this first comparison signal, so that this first current source is to this electric capacity charging;
Second current source; And
Discharge switch is connected between this second current source and the electric capacity, opens in response to this second comparison signal, so that this second current source is to this capacitor discharge.
8. Adjustable real-time zero current method for detecting that is used for the suitching type adjuster, this suitching type adjuster comprise bridge switch and connect bridge power switch down through switching node, it is characterized in that this method for detecting comprises:
(A) close the back at this time bridge power switch and monitor that the switching node state is with optimization zero current detecting door; And
(B) relatively the voltage of this switching node and this zero current are detected door to trigger zero current signal.
9. the Adjustable real-time zero current method for detecting that is used for the suitching type adjuster as claimed in claim 8 is characterized in that this steps A comprises:
Relatively the voltage of this switching node and reference voltage are to produce comparison signal;
Start pulse signal when this time bridge power switch is closed;
In response to this pulse signal this comparison signal of taking a sample, and according to sampling result decision rising signals and dropping signal; And
Increase or reduce count value according to this rising signals and dropping signal;
This count value is converted to aanalogvoltage.
10. the Adjustable real-time zero current method for detecting that is used for the suitching type adjuster as claimed in claim 8 is characterized in that this steps A comprises:
Start pulse signal when this time bridge power switch is closed;
Take a sample the voltage of this switching node to produce sampled signal in response to this pulse signal;
Relatively this sampled signal and reference voltage and produce comparison signal;
Increase or reduce count value according to this comparison signal;
This count value is converted to aanalogvoltage; And
Produce this zero current detecting door according to this aanalogvoltage.
11. the Adjustable real-time zero current method for detecting that is used for the suitching type adjuster as claimed in claim 8 is characterized in that this steps A comprises:
Relatively the voltage of this switching node and reference voltage are to produce comparison signal;
Start pulse signal when this time bridge power switch is closed;
In response to this pulse signal this comparison signal of taking a sample, and according to sampling result decision rising signals and dropping signal;
To the electric capacity charge or discharge, thereby produce aanalogvoltage according to this rising signals and dropping signal; And
Produce this zero current detecting door according to this aanalogvoltage.
12. the Adjustable real-time zero current method for detecting that is used for the suitching type adjuster as claimed in claim 8 is characterized in that this steps A comprises:
Start pulse signal when this time bridge power switch is closed;
Take a sample the voltage of this switching node to produce sampled signal in response to this pulse signal;
Relatively this sampled signal and reference voltage and produce first and second comparison signal;
To the electric capacity charge or discharge, thereby produce aanalogvoltage according to this first and second comparison signal; And
Produce this zero current detecting door according to this aanalogvoltage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010172358.4A CN102244463B (en) | 2010-05-14 | 2010-05-14 | For real-time adjustable zero current detector and the method for detecting of suitching type adjuster |
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| CN201010172358.4A CN102244463B (en) | 2010-05-14 | 2010-05-14 | For real-time adjustable zero current detector and the method for detecting of suitching type adjuster |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105842526A (en) * | 2012-05-19 | 2016-08-10 | 快捷半导体(苏州)有限公司 | Zero-current detection circuit and method, and voltage conversion circuit |
| CN110311579A (en) * | 2018-03-25 | 2019-10-08 | 立锜科技股份有限公司 | Communication protocol circuits and timesharing current-sensing circuit therein and method |
| CN111562430A (en) * | 2019-02-13 | 2020-08-21 | 新唐科技股份有限公司 | Zero current detection system |
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| CN1790886A (en) * | 2004-11-30 | 2006-06-21 | 株式会社瑞萨科技 | Semiconductor integrated circuit for controlling power supply, an electronic component and a power supply device |
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| CN105842526B (en) * | 2012-05-19 | 2019-05-24 | 快捷半导体(苏州)有限公司 | A kind of zero current detecting circuit and method and voltage conversion circuit |
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