CN102299623A - Control method for DC-DC (direct current-direct current) lock-in tube and device thereof - Google Patents
Control method for DC-DC (direct current-direct current) lock-in tube and device thereof Download PDFInfo
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Abstract
The invention relates to a control method for a DC-DC (direct current-direct current) lock-in tube and a device thereof. The device comprises a first comparator, a second comparator, a lock-in tube control error historical information storage and computation unit and an input offset voltage regulator. The method comprises the following steps that: the first comparator detects the voltage difference between input ends and outputs shutoff used for controlling the lock-in tube; the second comparator detects the voltage difference between two ends of the lock-in tube and outputs the control error information of the lock-in tube in the current clock period; the lock-in tube control error historical information storage and computation unit determines to decrease or increase the input offset voltages of the input ends of the first comparator in the (N+1)th, (N+2)th, (N+3)th, and other clock periods according to the output of the second comparator at the Nth clock period; and the input offset voltages of the input ends of the first comparator are decreased or increased based on the voltage difference between two ends of the lock-in tube at the shutoff moment in the previous clock period.
Description
Technical field
The present invention relates to the energy-conserving and environment-protective electronic product, be specifically related to the control method and the device of a kind of DC-to-DC (DC-DC) lock-in tube.
Background technology
Synchronous rectification is meant adopts the extremely low power field effect pipe (MOSFET) of conducting resistance, that is: lock-in tube, replace rectifier diode in the rectification circuit reducing a new technology of rectifier loss, but the power tube in the rectification circuit can only use MOSFET and can not use diode.It can improve the efficient of DC-DC converter greatly and not have the dead band voltage that is caused by Schottky barrier voltage.Power MOSFET belongs to voltage-controlled device.When making rectifier with power MOSFET, require grid voltage must with kept just finishing rectification function synchronously by the phase place of commutating voltage, so be referred to as synchronous rectification.
At present, in the DC-DC Switching Power Supply of low pressure output, extensively adopt synchronous rectification.Adopt the benefit of synchronous rectification to be: one, can improve the conversion efficiency of power supply, thus energy savings.Two, after lock-in tube is integrated into integrated circuit (IC) the inside, has reduced peripheral component, thereby saved application cost.Three, after lock-in tube is integrated into the IC the inside, reduced the volume of power supply.
Synchronous rectified DC-DC with buck translation circuit (BUCK) structure is that example is introduced traditional lock-in tube control circuit below.
Figure 1 shows that the circuit topology figure of traditional BUCK synchronous rectified DC-DC.Wherein show the comparator (ICMP) that is used for lock-in tube control.Fig. 2 and Fig. 3 have provided the work electric signal waveform of circuit working at the inductive current of continuous mode and non-continuous mode, power tube, lock-in tube respectively.
Shown in Fig. 2,3, lock-in tube should be closed in the inductive current charging stage, the conducting of inductive current discharge regime (inductive current IL is the charging stage when rising, and IL is a discharge regime when descending).
As shown in Figure 3, when circuit working during in non-continuous mode, inductive current can drop to zero, and should turn-off lock-in tube this moment, flows backwards to prevent inductive current.
Traditional lock-in tube control method is: adopt a comparator (ICMP) to detect the voltage at lock-in tube two ends, its output is used for controlling the shutoff of lock-in tube.Referring to Fig. 1 and Fig. 3, at the inductive current discharge regime, when inductive current did not drop to zero, the SW terminal voltage was lower than GND voltage for negative, and comparator output X is a low level, allows lock-in tube to open.When inductive current dropped to zero and occurs flowing backwards, the SW terminal voltage was higher than GND voltage for just, and comparator output X is a high level, closes lock-in tube.
Because actual comparator has certain transmission delay, upset immediately of comparator when SW terminal voltage zero passage, but postpone to be turned to high level again after a period of time, this moment the SW terminal voltage for just, promptly refluence has appearred in inductive current.So usually to comparator a fixing input imbalance is set, so that comparator moves in advance, when inductive current just during zero passage, comparator overturns and also closes lock-in tube during desirable situation.
The following describes the difficulty that is run into based on traditional lock-in tube control method:
One, in integrated circuit technology, complementary metal oxide semiconductors (CMOS) (CMOS) technology especially is because comparator has the bigger imbalance of input at random, so actual flip-flop transition of the point of comparator can show deviation at random.The input at random imbalance (VOS) of for example supposing comparator is to the maximum+/-15mv, the inductive current error when then lock-in tube turn-offs is:
I=VOS/RDSON
For example the conducting resistance of assumes synchronization pipe is 0.2Ohm, then in lock-in tube shutoff inductive current error constantly be+/-75mA.Suppose that lock-in tube just turn-offs at the inductive current zero crossing when VOS=0, then lock-in tube shutoff moment inductive current is 75mA when VOS=15mv, and lock-in tube shutoff moment inductive current is-75mA (refluence occurring) when VOS=-15mv.
Two, under different output voltage VO and inductance L, the rate of change of inductive current has evident difference, so also can be bigger for the variation of fixing comparator time-delay inductive current.The variable quantity of inductive current is provided by following formula:
L=2.2uH for example, comparator time-delay DELAY=50ns, when VO=0.6V and VO=3.3V, inductive current difference is 61.4mA.
If further improve the switching frequency of DC-DC, when promptly adopting littler inductance value, because the rate of change of inductive current is bigger, so electric current changes also bigger in identical time-delay.For example suppose that switching frequency brings up to 4 ~ 6MHz, when allowing to adopt the inductance of 0.47uH, the inductive current difference under the same terms will increase to 287mA by 61.4mA.
From above 2 difficulties as can be seen: lock-in tube control method lock-in tube in the time can't accomplishing inductive current just in zero passage under the non-continuous mode traditional the IC volume production is closed, but bigger departure at random or that determine is arranged, lock-in tube or shutoff in advance perhaps lag behind and turn-off.
Divide two kinds of situations to calculate below because the loss in efficiency that the turn-off time error of lock-in tube causes:
The assumes synchronization pipe turn-offs in advance.
The electric current of inductance is IL if turn-off constantly in advance, and the conducting voltage of establishing the parasitic body diode of lock-in tube is VD, and the switching frequency of DC-DC is f, and output voltage is VO, and output current is IO.
Output energy in the one-period:
Because lock-in tube turn-offs in advance, the energy that is lost on the body diode is in the one-period:
Loss in efficiency percentage is:
From above formula as can be seen, the high efficiency loss is big more more for frequency, and the inefficient more loss of output voltage is big more.
For example: IL=75mA, VD=0.65V, L=2.2uH, VO=1.2V
| IO(mA) | 1 | 5 | 10 | 30 | 50 |
| f(kHz) | 100 | 500 | 1000 | 1500 | 1500 |
| Wloss/WO*100% | 60.9% | 60.9% | 60.9% | 30.5% | 18.3% |
The assumes synchronization pipe lags behind and turn-offs.
The electric current that turn-offs moment inductance is IL if lag behind, and the DC-DC switching frequency is f, and output voltage is VO, and output current is IO.
Output energy in the one-period:
The shutoff because lock-in tube lags behind in the one-period, the energy of inductive current turn-up loss is:
Loss in efficiency percentage is:
From above formula as can be seen, the high efficiency loss is big more more for frequency, and the inefficient more loss of output voltage is big more.
For example: L=75mA, L=2.2uH, VO=1.2V
| IO(mA) | 1 | 5 | 10 | 30 | 50 |
| f(kHz) | 100 | 500 | 1000 | 1500 | 1500 |
| Wloss/WO*100% | 51.6% | 51.6% | 51.6% | 25.8% | 15.5% |
As seen from the above analysis, the shutoff because lock-in tube is closed in advance or lagged behind, the efficient of DC-DC can significantly descend when underloading (output current is less).
In sum, traditional lock-in tube control method has following shortcoming under the underloading pattern:
1, be subjected to the comparator input influence of imbalance at random, consistency differs greatly between the sheet of lock-in tube control;
2, for different output voltages and inductance, even comparator has fixing time-delay, lock-in tube turn-offs and constantly also can show bigger difference;
3, now the volume requirement of power supply is more and more littler, and this just requires to improve operating frequency, but since the error of lock-in tube control after operating frequency raises, its loss in efficiency can significantly rise;
4, present supply voltage trend is more and more lower, and from the analysis of front as can be seen, output voltage is low more, because the loss in efficiency that the error of lock-in tube control causes can significantly rise;
5, output current is low more, and the loss in efficiency that the lock-in tube departure causes under the equal conditions can increase.
Summary of the invention
The technical issues that need to address of the present invention are, how a kind of control method and device of DC-DC lock-in tube is provided, and can improve DC-DC efficient.
First technical problem of the present invention solves like this: make up a kind of control method of DC-DC lock-in tube, by the shutoff that first comparator detects the voltage difference between its input and exports the control lock-in tube, further comprising the steps of:
Detect the voltage difference at lock-in tube two ends and export the departure information (this departure information is meant that the shutoff of present clock period lock-in tube is in advance or lags behind) of present clock period lock-in tube by second comparator;
The storage of lock-in tube departure historical information is made a strategic decision according to the output of N clock cycle second comparator with arithmetic element and is reduced or increase the input offset voltage of first comparator input terminal in the N+i clock cycle; N, i are natural numbers;
The benchmark that the input offset voltage of described first comparator input terminal reduces or increases is to turn-off the voltage difference at lock-in tube two ends constantly at previous clock cycle lock-in tube.
According to control method provided by the invention, according to turn-off the input offset voltage that preferably adds/subtract described first comparator input terminal that constantly is in advance or lags behind and carry out at last clock cycle lock-in tube in the steps such as next clock cycle, that is: turn-offing what carry out in advance according to last clock cycle lock-in tube is the input offset voltage that adds described first comparator input terminal in the next clock cycle, and to turn-off be the input offset voltage that subtracts described first comparator input terminal in the next clock cycle and lag behind according to last clock cycle lock-in tube.
Another technical problem of the present invention solves like this: make up a kind of control device of DC-DC lock-in tube, be electrically connected the lock-in tube in the circuit of synchronous rectification, comprising:
First comparator, output (through drive circuit) is electrically connected described lock-in tube grid;
The input offset voltage adjuster, output is electrically connected the first input end of first comparator, input is electrically connected in the source electrode of described lock-in tube and the drain electrode, is used for increasing or reducing to export behind the input voltage according to the lock-in tube departure historical information storage output control signal with arithmetic element; First comparator, second input be electrically connected described lock-in tube source electrode and the drain electrode in another;
Corresponding respectively source electrode and the drain electrode that is electrically connected described lock-in tube of second comparator, two inputs;
Lock-in tube departure historical information is stored and arithmetic element, is electrically connected the grid of power tube in second comparator, described input offset voltage adjuster and the described circuit of synchronous rectification, is used for
According to the output of N clock cycle second comparator, reduce or increase the control signal of the input offset voltage of first comparator input terminal to described input offset voltage adjuster output correspondence in the N+i clock cycle; N, i are natural numbers.
According to control device provided by the invention, first comparator is the high-gain comparator, and second comparator is a high-speed comparator.
According to control device provided by the invention, described circuit of synchronous rectification is buck translation circuit structure (BUCK), boost type translation circuit structure (BOOST) or step-down/up type translation circuit structure (BUCK-BOOST) structure.
According to control device provided by the invention, described lock-in tube is N channel-type and P channel-type field effect transistor.
According to control device provided by the invention, described input offset voltage adjuster comprises constant-current source and above resistance of serial connection, the output of described input offset voltage adjuster is connected electrically between the described constant-current source and first resistance, and the input of described input offset voltage adjuster is selected to be connected electrically between the different resistance according to control signal.
According to control device provided by the invention, described lock-in tube departure historical information storage comprises mutual d type flip flop that is electrically connected and forward-backward counter with arithmetic element.
According to control device provided by the invention, described input offset voltage adjuster comprises controlled current source and a resistance, the output of described input offset voltage adjuster is connected electrically between the output and resistance of described controlled current source, and the input of described input offset voltage adjuster is connected an other end of described resistance.
According to control device provided by the invention, described lock-in tube departure historical information storage comprises d type flip flop, monostable (oneshot) circuit, charge pump circuit and controlled current flow source circuit with arithmetic element.
The control method of DC-DC lock-in tube provided by the invention and device, solve synchronous rectification and be applied to the difficult problem that DC-DC is operated under the non-continuous mode to be faced, overcome the shortcoming of conventional art, improve whole conversion efficiency and the consistency of DC-DC, and be more suitable for the application of low-voltage and high switching frequency, small size.Actual electronic product especially portable product common time more than 80% in application all be operated in the underloading pattern, thereby lock-in tube control technology proposed by the invention more can show advantage.Advantage during underloading of the present invention is specific as follows:
(1) can improve the efficient of DC-DC when underloading;
(2) can make synchronous rectification be used in higher switching frequency and when underloading, keep high efficiency, thereby reduce the volume of power supply;
(3) can make synchronous rectification be used in lower output voltage and when underloading, keep high efficiency;
(4) can significantly improve consistency between the sheet of DC-DC chip after the volume production, eliminate the adverse effect of bringing because of process deviation;
(5) can adapt to the variation of peripheral cell parameter automatically and keep minimum departure.
Description of drawings
Further the present invention is described in detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is the circuit topology schematic diagram of traditional BUCK synchronous rectified DC-DC;
Fig. 2 is the work wave schematic diagram under the circuit continuous mode shown in Figure 1;
Fig. 3 is the work wave schematic diagram under the circuit non-continuous mode shown in Figure 1;
Fig. 4 is a lock-in tube control device electricity structural representation of the present invention;
Fig. 5 is the circuit of synchronous rectification embodiment schematic diagram of BUCK structure of the present invention;
Fig. 6 is storage of lock-in tube departure historical information and arithmetic element embodiment one electrical block diagram in the circuit shown in Figure 5;
Fig. 7 is input offset voltage VOS adjuster embodiment one electrical block diagram in the circuit shown in Figure 5;
Fig. 8 is the work wave and the sequential schematic diagram of embodiment one correspondence under the non-continuous mode;
Fig. 9 and 10 is storages of lock-in tube departure historical information and arithmetic element embodiment two and input offset voltage VOS adjuster embodiment two electrical block diagrams in the circuit shown in Figure 5;
Figure 11 is the work wave and the sequential schematic diagram of embodiment two correspondences under the non-continuous mode;
Figure 12 is the circuit of synchronous rectification embodiment schematic diagram of BOOST structure of the present invention.
Embodiment
The first, basis of the present invention at first is described:
Lock-in tube control method of the present invention and device, its apparatus structure as shown in Figure 4, this lock-in tube control device comprises 6 modules:
(1) lock-in tube: comprise 3 terminals at least.G is a grid, and D/S is respectively drain electrode, source electrode.The G terminal meets lock-in tube control signal XDRV, and the D terminal meets an end and the called after SW of inductance usually, and S terminal one end common and output filter capacitor joins;
(2) main comparator: be a high-gain comparator, be used for the voltage of comparison lock-in tube D/S end, its output is used for controlling the shutoff of lock-in tube;
(3) auxiliary comparator: be the high-speed comparator of a medium gain, be used for detecting lock-in tube and whether turn-off in advance;
(4) input offset voltage VOS adjuster: the input offset voltage that is used for regulating main comparator;
(5) storage of lock-in tube departure historical information and arithmetic element: be used for the historical information of lock-in tube departure is stored union.It writes down n, n-1, n-2 ... the lock-in tube departure historical information in isochronon cycle, and the process computing dopes the controlling value of the input offset voltage VOS of n+1 clock cycle;
(6) lock-in tube control logic and driving: be used for opening or turn-offing lock-in tube.
The operation principle of lock-in tube control device of the present invention is:
Main comparator detects the voltage at lock-in tube D/S two ends, when the voltage of D/S end goes to zero, and the main comparator upset, control logic and drive circuit are delivered in its output, and turn-off lock-in tube.Auxiliary comparator detects whether lock-in tube turn-offs in advance during DC-DC is in TOFF, (for example if turn-offing the SW end of then having no progeny in the pass in advance, lock-in tube can occur holding the impulse level that hangs down an about 600mv of VD at least than S for BUCK DC-DC, if lagging behind, turn-offs lock-in tube, then close to have no progeny and this impulse level can not occur), the output of auxiliary comparator has comprised the information that whether occurs turn-offing in advance at a clock cycle inter-sync pipe.The historical information storage is stored and computing the historical information of auxiliary comparator output with arithmetic element, its work principle is: if turn-offing in advance appears in previous clock cycle lock-in tube, then adjust the VOS predicted value (for example making that VOS reduces) of next clock cycle, so that lag behind constantly in the shutoff of next clock cycle main comparator; If turn-offing does not in advance appear in previous clock cycle lock-in tube, then adjust the VOS predicted value (for example making VOS increase) of next clock cycle, so that shift to an earlier date constantly in the shutoff of next clock cycle main comparator.The effect of input offset voltage VOS adjuster is an input offset voltage of adjusting main comparator according to the historical information storage and the output of arithmetic element, to change the sequential that lock-in tube turn-offs.
From the description of above operation principle as can be seen, finally under limit, lock-in tube is always operating at the critical condition of turn-offing in advance and lagging behind and turn-offing, and therefore can minimize the lock-in tube departure.
Core or major technique based on above lock-in tube control method and device are characterised in that:
(1) introduced feedback mechanism.By the departure of auxiliary comparator sample-synchronous pipe, after historical information stores and arithmetic element are to this Error processing, export input offset voltage VOS adjuster to.Input offset voltage VOS adjuster to the control result of loop is: the departure of lock-in tube can progressively change to the direction that reduces.Through after certain clock cycle feedback modifiers, the departure of final lock-in tube will maintain near the minimum value and fluctuation up and down.
(2) historical information storage and arithmetic element have been introduced.The system that makes can be according to N, N-1, N-2 ... inferior historical information is predicted the N+1 time VOS regulated value.Because the lock-in tube departure of present clock period must be waited until after error has taken place and could effectively sample, so can only predict following adjusted value according to the control information of history.
(3) introduced input offset voltage VOS adjuster.It is the interface of Error Feedback control circuit and main comparator.Pass through feedback mechanism, input offset voltage VOS adjuster not only can compensate the intrinsic imbalance of input at random of main comparator, can also compensate because the lock-in tube departure that other factors (for example variation of comparator time-delay, the variation of inductive current slope etc.) cause.In a word, because the lock-in tube departure that causes of various factors can equivalence or be mapped as the input imbalance of main comparator, and this imbalance can be revised automatically by feedback loop.
(4) introduced auxiliary comparator.Its effect in feedback control loop is that the lock-in tube departure is sampled, and the result of its sampling sends into historical information storage and arithmetic element.Auxiliary comparator only need be told the input differential signal (main comparator should differentiate the input differential signal of several mv levels) of size for the about 600mv of VD, so auxiliary comparator does not need to accomplish very high precision, also do not need very high gain, so it is easy to realize high-speed.The speed of auxiliary comparator is fast more, and its lock-in tube departure that can accurately sample, differentiate is also more little, therefore final control residual error also minimum (the hypothesis loop gain is enough big).
Range of application of the present invention:
The control method of above lock-in tube can extensively apply in the DC-DC switching power circuit of various synchronous rectifications, BOOST for example, and BUCK is in BUCK-BOOST and other the various topologys of deriving.Except DC-DC, the control method of above lock-in tube also can be applicable in the various led drive circuits based on inductance.
The second, be elaborated in conjunction with the specific embodiment of the invention:
㈠ BUCK structure
As shown in Figure 5, the present invention is applied to a specific embodiment of BUCK structure, specifically comprises:
Main comparator is the comparator of a high-gain, need tell the input signal of several millivolts of levels.
Auxiliary comparator is the high-speed comparator of a medium gain, only need tell the signal of 300 ~ 600mV level.
Lock-in tube is a power NMOS.
Lock-in tube control logic and drive circuit are Digital Logic and drive circuit.NDRV is output as high level when PDRV becomes low level by high level, opens lock-in tube.When X was become high level or PDRV and become high level by low level, NDRV was output as low level, closes lock-in tube.
Above plurality of units circuit, common IC design engineer is easy to just can design realization according to functional description.The design of mainly introducing two other core cell circuit below realizes.
Lock-in tube departure historical information storage among the figure and arithmetic element, input offset voltage VOS adjuster can have multiple implementation.Provide the embodiment of two kinds of optimizations below respectively.A kind of realization that is based on digital control method, a kind of realization that is based on analog control method.
㈠ is based on digital control method
The specific embodiment of the lock-in tube departure historical information storage of this method and arithmetic element, input offset voltage VOS adjuster is respectively as Fig. 6, shown in Figure 7.Fig. 8 has provided work wave and the sequential chart based on the circuit of synchronous rectification of Fig. 5,6,7 embodiment.
As shown in Figure 6, the embodiment of this lock-in tube departure historical information storage and arithmetic element, wherein: signal Y is input to a reverser.Signal PDRV is input to a reverser, connects a delay unit thereafter again.
Forward-backward counter is a bidirectional counter, its functional description is: the action of rising edge hour counter occurs at CLK, if UPDN is high level then carries out plus coujnt when rising edge appears in CLK, if UPDN is low level then carries out the subtraction counting when rising edge appears in CLK.After the counter meter is full, will keep and not zero clearing (if promptly counter is output as " 1 " entirely, when CLK rising edge occurs and UPDN is a height, counter is exported and is remained unchanged; If counter is output as " 0 " entirely, when CLK rising edge occurs and UPDN is low, counter output remains unchanged.) RST is for forcing clear terminal.
㈡ is based on analog control method
The specific embodiment of the lock-in tube departure historical information storage of this method and arithmetic element, input offset voltage VOS adjuster is shown in Fig. 9 a and 9b.Figure 10 has provided work wave and the sequential chart based on the circuit of synchronous rectification of Fig. 5,9 embodiment.
At last, the present invention gives specific embodiment of BOOST structure, structure as shown in figure 11, in this BOOST structure embodiment, historical information storage of lock-in tube departure and arithmetic element, input offset voltage VOS adjuster can have two kinds of implementation methods equally with reference to the embodiment of BUCK structure.A kind of Digital Implementation method that is based on bidirectional counter, a kind of pattern implementation that is based on charge pump.For avoiding repetition, no longer list in detail one by one.
In addition, synchronisation control means of the present invention also can apply among other topological DC-DC such as BUCK-BOOST, for avoiding repeating no longer to provide embodiment.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to claim scope of the present invention change and modify, and all should belong to the covering scope of claim of the present invention.
Claims (10)
1. the control method of a DC-DC lock-in tube is detected the voltage difference between its input and exported the shutoff of controlling lock-in tube by first comparator, it is characterized in that, and is further comprising the steps of:
Detect the voltage difference at lock-in tube two ends and export the departure information of present clock period lock-in tube by second comparator;
Make a strategic decision according to the output of N clock cycle second comparator by lock-in tube departure historical information storage and arithmetic element and to reduce or to increase the input offset voltage of first comparator input terminal in the N+i clock cycle; N, i are natural numbers;
The benchmark that the input offset voltage of described first comparator input terminal reduces or increases is that previous clock cycle lock-in tube turn-offs the voltage difference at lock-in tube two ends constantly.
2. according to the described control method of claim 1, it is characterized in that, turn-offing what carry out in advance according to last clock cycle lock-in tube is the input offset voltage that adds described first comparator input terminal in the next clock cycle, and to turn-off be the input offset voltage that subtracts described first comparator input terminal in the next clock cycle and lag behind according to last clock cycle lock-in tube.
3. the control device of a DC-DC lock-in tube is electrically connected the lock-in tube in the circuit of synchronous rectification, it is characterized in that, comprising:
First comparator, output are electrically connected the grid of described lock-in tube;
The input offset voltage adjuster, output is electrically connected the first input end of first comparator, input is electrically connected in the source electrode of described lock-in tube and the drain electrode, is used for increasing or reducing to export behind the input voltage according to the lock-in tube departure historical information storage output control signal with arithmetic element; First comparator, second input be electrically connected described lock-in tube source electrode and the drain electrode in another;
Corresponding respectively source electrode and the drain electrode that is electrically connected described lock-in tube of second comparator, two inputs;
Storage of lock-in tube departure historical information and arithmetic element, be electrically connected the grid of power tube in the output of second comparator, described input offset voltage adjuster and the described circuit of synchronous rectification, be used for output, reduce control signal or increase control signal to described input offset voltage adjuster output in the N+i clock cycle according to N clock cycle second comparator; N, i are natural numbers.
4. according to the described control device of claim 3, it is characterized in that first comparator is the high-gain comparator, second comparator is a high-speed comparator.
5. according to the described control device of claim 3, it is characterized in that described circuit of synchronous rectification is buck translation circuit structure or boost type translation circuit structure or step-down/up type translation circuit structure.
6. according to the described control device of claim 3, it is characterized in that described lock-in tube is N channel-type and P channel-type field effect transistor.
7. according to the described control device of claim 3, it is characterized in that, described input offset voltage adjuster comprises constant-current source and above resistance of serial connection, the output of described input offset voltage adjuster is connected electrically between the described constant-current source and first resistance, and the input of described input offset voltage adjuster is selected to be connected electrically between the different resistance according to control signal.
8. according to the described control device of claim 3, it is characterized in that, described input offset voltage adjuster comprises controlled current source and a resistance, the output of described input offset voltage adjuster is connected electrically between the output and resistance of described controlled current source, and the input of described input offset voltage adjuster is connected an other end of described resistance.
9. according to the described control device of claim 3, it is characterized in that described lock-in tube departure historical information storage comprises mutual d type flip flop that is electrically connected and plus-minus register with arithmetic element.
10. according to the described control device of claim 3, it is characterized in that described lock-in tube departure historical information storage comprises d type flip flop, monostable circuit, charge pump circuit and controlled current flow source circuit with arithmetic element.
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| TWI610525B (en) * | 2016-12-30 | 2018-01-01 | 致茂電子股份有限公司 | Bidirectional power supply with parallel connected protection and method thereof |
| CN108270211A (en) * | 2016-12-30 | 2018-07-10 | 致茂电子(苏州)有限公司 | Bi-directional power feeding mechanism and its method with parallel connection protection |
| CN110661402A (en) * | 2019-09-29 | 2020-01-07 | 广州金升阳科技有限公司 | Self-adaptive ZVS circuit and control method thereof |
| CN114094826A (en) * | 2021-09-10 | 2022-02-25 | 珠海智融科技股份有限公司 | Method, system, equipment and medium for improving efficiency of buck-boost controller |
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| CN105448257A (en) * | 2015-12-23 | 2016-03-30 | 南京中电熊猫液晶显示科技有限公司 | DC/DC power source converter connected with liquid crystal display panel |
| CN105448257B (en) * | 2015-12-23 | 2018-05-04 | 南京中电熊猫液晶显示科技有限公司 | A kind of DC/DC power supply changeover devices being connected with liquid crystal display panel |
| TWI610525B (en) * | 2016-12-30 | 2018-01-01 | 致茂電子股份有限公司 | Bidirectional power supply with parallel connected protection and method thereof |
| CN108270211A (en) * | 2016-12-30 | 2018-07-10 | 致茂电子(苏州)有限公司 | Bi-directional power feeding mechanism and its method with parallel connection protection |
| CN108270211B (en) * | 2016-12-30 | 2021-06-15 | 致茂电子(苏州)有限公司 | Bidirectional power supply device with parallel protection and method thereof |
| CN110661402A (en) * | 2019-09-29 | 2020-01-07 | 广州金升阳科技有限公司 | Self-adaptive ZVS circuit and control method thereof |
| CN110661402B (en) * | 2019-09-29 | 2021-03-02 | 广州金升阳科技有限公司 | Self-adaptive ZVS circuit and control method thereof |
| CN114094826A (en) * | 2021-09-10 | 2022-02-25 | 珠海智融科技股份有限公司 | Method, system, equipment and medium for improving efficiency of buck-boost controller |
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| CN102299623B (en) | 2014-01-15 |
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