CN109617413A - Boost chip and its mode switching circuit - Google Patents
Boost chip and its mode switching circuit Download PDFInfo
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- CN109617413A CN109617413A CN201910091818.1A CN201910091818A CN109617413A CN 109617413 A CN109617413 A CN 109617413A CN 201910091818 A CN201910091818 A CN 201910091818A CN 109617413 A CN109617413 A CN 109617413A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
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Abstract
The invention discloses a kind of boost chip and its mode switching circuits, in the boost chip, mode switching circuit has compensating current element, when boost chip is switched to boost mode by direct mode operation, it can be compensating electric capacity charging by the compensating current element, so as to improve error amplifier output end rate of voltage rise, and then current compensation can be carried out to load, avoid boost chip when being switched to boost mode by direct mode operation, load current, which will appear, gradually decreases the problem of being gradually increasing again, so that load can work normally.
Description
Technical field
The present invention relates to technical field of integrated circuits, more specifically, being related to a kind of boost chip and its pattern switching electricity
Road.
Background technique
DCDC chip is switching power source chip, usually using capacitor, the energy storage characteristic of inductance, passes through controlled tr tube
(MOS etc.) carries out the movement of HF switch, and the power storage of input is inner in capacitor (or inductance), when the switches are opened, electric energy
It is released to load again, energy is provided.DCDC chip mainly includes that boosting (BOOST, abbreviation BST) converter and decompression (Buck) become
Parallel operation.
After chip starting, BST converter default is work in direct mode operation, is detecting that current source pressure difference meets mode and cut
When changing condition, BST converter needs to be switched to boost mode.Existing chip is switched to boosting by direct mode operation in BST converter
After mode, during rising on the output voltage, load current, which will appear, gradually decreases the problem of being gradually increasing again.
Summary of the invention
In view of this, technical solution of the present invention provides a kind of boost chip and its mode switching circuit, solves boosting
When being switched to boost mode by direct mode operation, load current reducing the problem of being gradually increasing again chip occurs.
To achieve the goals above, the invention provides the following technical scheme:
A kind of mode switching circuit of boost chip, the boost chip are used to be load supplying, the pattern switching electricity
Road includes:
Error amplifier, the error amplifier have normal phase input end, negative-phase input and output end, and negative is defeated
Enter and hold input reference voltage, normal phase input end and the load connect, to input the voltage of the load；
Compensating electric capacity, one end of the compensating electric capacity are connect with the output end of the error amplifier, other end ground connection；
Compensating current element, the compensating current element are used to be switched to boost mode by direct mode operation in the boost chip
When, for the compensating electric capacity charge, improve the rate of voltage rise of the output end of the error amplifier, with to it is described load into
Row electric current supplement.
Preferably, in above-mentioned mode switching circuit, the compensating electric capacity is amplified by a compensation resistance and the error
The output end of device connects.
Preferably, in above-mentioned mode switching circuit, the compensating current element is grounded by the compensating electric capacity, and is passed through
The compensation resistance is connect with the output end of the error amplifier.
Preferably, in above-mentioned mode switching circuit, the compensating current element passes through a trigger switch and compensation electricity
Hold connection, the trigger switch is based on trigger signal and executes switch motion；
Wherein, the trigger signal is in the set period of time that the boost chip is switched to boost mode by direct mode operation
Control the trigger switch conducting.
Preferably, in above-mentioned mode switching circuit, boost mode is extremely by the boost chip for the trigger signal
In the period that the output voltage of the boost chip output end is begun to ramp up, the trigger switch conducting is controlled.
Preferably, in above-mentioned mode switching circuit, the negative-phase input of the error amplifier passes through the first current source
Ground connection, is connect by first resistor with the output end of the boost chip；
Wherein, the output voltage of the boost chip output end and first current source are the negative of the error amplifier
Phase input terminal provides the reference voltage.
The present invention also provides a kind of boost chip, the boost chip includes:
Mode switching circuit described in any of the above embodiments.
Preferably, in above-mentioned boost chip, the boost chip includes: first switch tube, second switch, BST ring
Road control circuit, drive current source and current source loop control circuit；
The BST loop control circuit includes the mode switching circuit；
The first electrode of the first switch tube is connect with the first port of the boost chip, second electrode ground connection；
The first port is connected to power supply by an inductance；
The first electrode of the second switch is connect with the output end of the boost chip, second electrode and described the
Single port connection；The output end passes through a capacity earth；
The grid of the grid and the second switch of the BST loop control circuit and the first switch tube connects
It connects, with the on state of control switch pipe, and is connect with the output end of the boost chip and load end, to obtain the liter
Press the output voltage of chip output and the load voltage of the boost chip load end；
The input terminal of the drive current source is connect with the output end of the boost chip, and output end connects the boosting
The load end of chip, control terminal connect the current source loop control circuit.
Preferably, in above-mentioned boost chip, the drive current source is third switching tube.
Preferably, in above-mentioned boost chip, the load end of the boost chip is for connecting LED load.
As can be seen from the above description, the boost chip and its mode switching circuit that technical solution of the present invention provides at least have
It is following the utility model has the advantages that
In the boost chip, mode switching circuit has compensating current element, is switched in boost chip by direct mode operation
It can be compensating electric capacity charging by the compensating current element, so as to improve the output of error amplifier when boost mode
The rate of voltage rise at end, and then current compensation can be carried out to load, avoid boost chip from being switched to liter by direct mode operation
When die pressing type, load current, which will appear, gradually decreases the problem of being gradually increasing again, so that load can work normally.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of electrical block diagram of boost chip provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of mode switching circuit in boost chip shown in Fig. 1；
Fig. 3 is the timing diagram of boost chip shown in Fig. 1；
Fig. 4 is boost chip using steady operation waveform diagram under valley point current mould control mode；
Fig. 5 is the structural schematic diagram of one mode switching circuit provided in an embodiment of the present invention；
Fig. 6 is the corresponding timing diagram of mode switching circuit shown in Fig. 5.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As stated in the background art, existing boost chip is when being switched to boost mode by direct mode operation, in output voltage
In uphill process, load current, which will appear, gradually decreases the problem of being gradually increasing again, load current whole uphill process not
It is enough smooth, this certain loads are applied be not intended to there are the problem of.Below with the circuit structure of boost chip and work
Principle is illustrated.
With reference to Fig. 1, Fig. 1 is a kind of electrical block diagram of boost chip provided in an embodiment of the present invention, boost chip
Include: the first port of corresponding voltage signal SW, the second port of corresponding power voltage VIN, correspond to the defeated of output voltage VO UT
Outlet, the load end for connecting load, the ground terminal for being grounded (GND) and two are for connecting the interface of host.Two
A interface passes through control line SCL respectively and connect with data line SDA with host.Output end is grounded by capacitor Cout.First port
It is connect by inductance L with the anode of power supply E, second port is directly connect with the anode of power supply E.Load end is loaded for connecting,
It is illustrated for loading as flash lamp (such as LED) in Fig. 1, corresponding voltage signal VLED, load is including but not limited to
LED。
There are multiple function module circuits, shown in including but not limited to Fig. 1: first switch tube inside boost chip
M1, second switch M2, BST loop control circuit, drive current source and current source loop control circuit.With third in Fig. 1
Switching tube M3 is as drive current source.The first port of the first electrode connection boost chip of first switch tube M1, the second electricity
Pole ground connection.The output end of the first electrode connection boost chip of second switch, second electrode connect the first of boost chip
Port.The output end of the input terminal connection boost chip of drive current source, output end connect the load end of boost chip.BST
Loop control circuit is separately connected the grid and its output end of the grid of first switch tube, second switch, for based on defeated
Voltage VOUT controls the on state of two switching tube out.Current source loop control circuit connects the control terminal of drive current source,
For controlling the on state of drive current source.BST loop control circuit is as BST converter.Third switching tube M3 is in Fig. 1
PMOS, shown in fig. 1 is the drive scheme of BST converter Yu PMOS current source.
When boost chip is used for as flash lamp driving chip, the load current that different usage scenarios needs to drive is not yet
Together, in order to improve the transfer efficiency of flash lamp driving chip, relatively mainstream is BST converter and PMOS shown in FIG. 1 at present
Current source structure.When needing low current, the work of BST loop control circuit is in direct mode operation, at this point, second switch M2 is connected,
First switch tube M1 shutdown.When needing high current, the work of BST loop control circuit maintains in drive current source in boost mode
Pressure drop in fixed voltage VHR, to improve overall conversion efficiency.VHR=VOUT-VLED, in general, VHR is to take into account electric current essence
The reference voltage of degree and efficiency, value can be 400mV.
BST loop control circuit defaults work in direct mode operation after starting, is less than in the pressure difference for detecting drive current source
VHR (pressure difference of drive current source input terminal and output end), BST loop control circuit is switched to boost mode.Due to when needs
When being switched to boost mode, load current is bigger, therefore The faster the better for switch speed.However, generally for compensation letter
It is single, the control mode of BST loop control circuit be all using current-mode control mode (valley or peak value), in view of direct mode operation and
Boost mode smoothly switches, and general valley point current mould control mode is more often used, this is because valley point current mould control mode is managed
It can start from scratch by upper duty ratio.For flash lamp driving chip, long-term work direct mode operation and boost mode it
Between, when especially critical, the duty ratio very little of boost chip system requirements, thus valley point current mould control mode be more suitable for it is this kind of
Chip.Wherein, duty ratio refers to that high potential is held time and accounts for the time scale of a cycle.
It is the structural schematic diagram of mode switching circuit in boost chip shown in Fig. 1 with reference to Fig. 2, Fig. 2, mode shown in Fig. 2 turns
Changing circuit includes: error amplifier, compensating electric capacity Cc, compensation resistance Rc, resistance R1 and current source I0.Error amplifier is just
Phase input terminal connects the load patch of boost chip, and negative-phase input is grounded by current source I0, and is risen by resistance R1 connection
The output end of chip is pressed, to access output end voltage VOUT.The voltage of negative-phase input is equal to VOUT-VHR.Error amplifier
Output end output voltage is connect with one end of compensation resistance Rc, and the other end of compensation resistance Rc is grounded by compensating electric capacity Cc.Accidentally
The output end output voltage signal EAOUT of poor amplifier.Error amplifier shown in Fig. 2 is BST loop control electricity in boost chip
The internal error amplifier on road.
In boost chip, BST loop control circuit needs its internal error normal amplifier operation under boost mode, leads to
Often in order to which boost chip system is stablized, the mutual conductance gm of error amplifier is smaller, and its output end needs to connect a compensation
Capacitor Cc.When being switched to boost mode by direct mode operation, since compensating electric capacity Cc charging is slow, cause switch speed slow, this section
The electric current of load LED, which will appear, in time is first gradually reduced the problem of being gradually increasing again, as shown in figure 3, Fig. 3 is to rise shown in Fig. 1
The timing diagram for pressing chip starts to carry out pattern switching in left side dotted line corresponding function moment BST loop control circuit, by leading directly to mould
Formula is switched to boost mode, and the pressure drop of drive current source at this time maintains fixed voltage VHR always, on the output voltage vout
During rising, a hole is fallen under the electric current ILED of LED, that is, the electric current ILED for above-mentioned LED occur first is gradually reduced again gradually
The electric current ILED of the problem of rising, LED are not smooth enough, which is to be not intended to for for some applications using flash lamp
Have.
In order to stablize boost chip system, the mutual conductance gm of error amplifier smaller (such as generally only 10 μ S), and
Compensating electric capacity Cc bigger (such as generally having 80 μ F), the Slew Rate that will lead to output voltage EOUT in this way is smaller, output voltage
The rate of climb of EOUT is very slow, influences the switching circuit that BST loop control circuit is switched to boost mode from direct mode operation.
The rate of climb of output voltage EOUT is slow, due to being using valley point current mould control mode, only in BST ring
Road control circuit internal trigger voltage signal Vramp just starts switch motion when touching output voltage signal ROUT, so that first
Switching tube M1 conducting, second switch M2 shutdown, inductance L start stored energy and boost to output voltage VO UT, output electricity
Press the EOUT rate of climb slower transit time longer, the hole fallen under load current ILED is bigger, valley point current mould control mode
Work wave is as shown in Figure 4.Wherein, current-mode refers to that feedback information is the fixed-frequency control mode of current information.
It is boost chip using steady operation waveform diagram under valley point current mould control mode, trigger voltage with reference to Fig. 4, Fig. 4
Signal Vramp corresponds to the rising edge of pulse-modulated signal PWM in chip, voltage signal SW when touching output voltage signal ROUT
Rising edge correspond to the rising edge of internal clock signal CLK.The failing edge of voltage signal SW starts inductive current IL and starts to increase,
The rising edge inductive current IL of voltage signal SW is begun to decline.Clock signal clk rising edge then, opens second switch M2,
Inductive current IL is begun to decline, and when trigger signal Vramp touches output voltage EOUT, is closed second switch M2, is opened
First switch tube M1, inductive current IL are begun to ramp up, and constantly repeat the process, stablize voltage and electricity required for output loading
Stream.
The embodiment of the invention provides one kind can accelerate the mode that boost chip is switched to from direct mode operation boost mode
Switching circuit solves the problems, such as that being gradually increasing again occurs first being gradually reduced in load current in output voltage OUT uphill process.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
With reference to Fig. 5, Fig. 5 is the structural schematic diagram of one mode switching circuit provided in an embodiment of the present invention, which cuts
Circuit is changed for boost chip, which includes: error amplifier, and the error amplifier is inputted with positive
End, negative-phase input and output end, negative-phase input input reference voltage, normal phase input end and the load connect,
To input the voltage of the load；One end of compensating electric capacity Cc, the compensating electric capacity Cc and the output end of the error amplifier
Connection, other end ground connection；Compensating current element I1, the compensating current element I1 in the boost chip by direct mode operation for being switched
When to boost mode, charges for the compensating electric capacity Cc, improve raising speed on the voltage EOUT of the output end of the error amplifier
Degree, to carry out electric current supplement to the load.
The load of the boost chip can be LED, and the normal phase input end of error amplifier inputs the both ends of LED at this time
Voltage VLED.Reference voltage is VOUT-VHR.
The compensating electric capacity Cc is connect by a compensation resistance Rc with the output end of the error amplifier.The compensation electricity
Stream source I1 is grounded by the compensating electric capacity, and is connect by the compensation resistance Rc with the output end of the error amplifier.
The compensating current element I1 is connect by a trigger switch K with the compensating electric capacity Cc, and the trigger switch K is based on
Trigger signal PTB-PULSE executes switch motion；Wherein, the trigger signal PTB-PULSE is in the boost chip by leading directly to
The control trigger switch conducting in pattern switching to the set period of time of boost mode.The trigger signal PTB-PULSE by
In the period that the output voltage that the boost chip starts boost mode to the boost chip output end is begun to ramp up, control
The trigger switch K conducting.
The negative-phase input of the error amplifier is grounded by the first current source I0, passes through first resistor R1 and the liter
The output end connection of chip is pressed, with input and output voltage VOUT；Wherein, the output voltage VO UT of the boost chip output end with
The first current source I0 provides the reference voltage for the negative-phase input of the error amplifier.Two side pressure of first resistor R1
It is reduced to fixed voltage VHR, the first current source I0 is controllable current source.
With reference to Fig. 6, Fig. 6 is the corresponding timing diagram of mode switching circuit shown in Fig. 5, and direct mode operation is caused to be switched to boosting mould
Formula is slow-footed the reason is that because the Slew Rate of error amplifier is smaller in BST loop control circuit, in the embodiment of the present invention, leads to
Overcompensation current source I1 is injected into the upper end of compensating electric capacity Cc, charges for compensating electric capacity Cc, the defeated of error amplifier can be improved
The rate of climb of voltage EOUT out improves the Slew Rate of error amplifier.Compensating current element I1 is for mentioning in the embodiment of the present invention
The rate of climb of high output voltage EOUT needs to connect with the output end of error amplifier, compensating current element I1 can directly with
The output end of error amplifier connects, but in order to not influence boost chip system worked well, needs rationally to control compensation electricity
The time point that stream source I1 is added and exits, therefore be preferable to provide as shown in figure 5, compensating current element I1 passes through compensation resistance Rc and mistake
The output end of poor amplifier connects.In this way, the injection start time (trigger signal PTB-PULSE rising edge) of compensating current element I1
It is the threshold point (at the time of direct mode operation is switched to boost mode) for triggering direct mode operation to boost mode, compensating current element I1's
It is a little after the corresponding switch motion of first time pulse-modulated signal PWM occurs that injection, which is removed,.The compensation electricity being additionally added in this way
Stream source I1 will not have any impact to the normal work of boost chip system.The size of compensating current element I1 and boost chip system
The size and the length for the switching time expected for the compensating electric capacity Cc that system uses are related, can be 10 μ A in the application.
Trigger signal PTB-PULSE is to work as chip interior for controlling control signal whether compensating current element I1 injection
When detection circuit detects that VOUT-VLED is less than VHR, trigger signal PTB-PULSE becomes high potential, and boost chip system starts
After PWM switch motion, trigger signal PTB-PULSE becomes low potential, completes compensation miscellaneous function.
As can be seen from the above description, valley point current mould control can be improved in mode switching circuit described in technical solution of the present invention
The boost chip of mode processed is switched to the conversion speed of boost mode from direct mode operation.
Based on the above embodiment, another embodiment of the present invention additionally provides a kind of boost chip, which includes upper
State mode switching circuit described in embodiment.
The structure of the boost chip can be refering to what is shown in Fig. 1, the boost chip includes: first switch tube M1, second
Switching tube M2, BST loop control circuit, drive current source and current source loop control circuit；Drive current source is opened for third
Close pipe M3.The load end of the boost chip is for connecting LED load.Each switching tube can be power switch tube.In Fig. 1,
First switch tube M1 is NMOS, and second switch M2 is PMOS, and third switching tube M3 is PMOS.The type of each switching tube is unlimited
Shown in Fig. 1, when switching tube type difference, its corresponding grid control signal opposite in phase.It is identical as foregoing description, it is described
The first electrode of first switch tube M1 is connect with the first port of the boost chip, second electrode ground connection；The first end
Mouth is connect by an inductance L with power supply E；The first electrode of the second switch M2 and the output end of the boost chip connect
It connects, second electrode is connect with the first port；The output end holds ground connection by an electricity Cout.
The BST loop control circuit and the grid of the first switch tube M1 and the grid of the second switch M2
Connection, with the on state of control switch pipe, and connect with the output end of the boost chip and load end, described in obtaining
The load voltage of the output voltage of boost chip output end and the boost chip load end.The input of the drive current source
End is connect with the output end of the boost chip, and output end connects the load end of the boost chip, and control terminal connects institute
State current source loop control circuit.
It is that the BST loop control circuit includes the mode switching circuit, shown mode switching circuit with Fig. 1 difference
As shown in Figure 5.The output voltage EOUT of error amplifier by BST loop control circuit other function circuit evolving control the
The gate voltage signal of one switching tube M1 and second switch is realized with controlling the switch state of two switching tubes to driving
The regulation of current source, and then realize the regulation to load current.
Boost chip described in the embodiment of the present invention includes mode switching circuit described in above-described embodiment, is cut by direct mode operation
When changing to boost mode, there is faster switch speed, avoid during load current rises on the output voltage vout and occur
It is gradually reduced the problem of rising again, ensure that the normal reliable operation of boost chip load.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For boosting disclosed in embodiment
For chip, since it is corresponding with mode switching circuit disclosed in embodiment, so being described relatively simple, related place ginseng
See that mode switching circuit corresponding part illustrates.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that article or equipment including a series of elements not only include those elements, but also
It including other elements that are not explicitly listed, or further include for this article or the intrinsic element of equipment.Do not having
In the case where more limitations, the element that is limited by sentence "including a ...", it is not excluded that in the article including above-mentioned element
Or there is also other identical elements in equipment.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (10)
1. a kind of mode switching circuit of boost chip, the boost chip is used to be load supplying, which is characterized in that the mould
Formula switching circuit includes:
Error amplifier, the error amplifier have normal phase input end, negative-phase input and output end, negative-phase input
Input reference voltage, normal phase input end and the load connect, to input the voltage of the load；
Compensating electric capacity, one end of the compensating electric capacity are connect with the output end of the error amplifier, other end ground connection；
Compensating current element, the compensating current element are used for when the boost chip is switched to boost mode by direct mode operation, are
The compensating electric capacity charging, improves the rate of voltage rise of the output end of the error amplifier, to carry out electricity to the load
Stream supplement.
2. mode switching circuit according to claim 1, which is characterized in that the compensating electric capacity by one compensation resistance with
The output end of the error amplifier connects.
3. mode switching circuit according to claim 2, which is characterized in that the compensating current element passes through the compensation electricity
Hold ground connection, and is connect by the compensation resistance with the output end of the error amplifier.
4. mode switching circuit according to claim 1, which is characterized in that the compensating current element passes through a trigger switch
It is connect with the compensating electric capacity；
The trigger switch is based on trigger signal and executes switch motion；
Described in the trigger signal controls in the set period of time that the boost chip is switched to boost mode as direct mode operation
Trigger switch conducting.
5. mode switching circuit according to claim 4, which is characterized in that the trigger signal is opened by the boost chip
In the period that the output voltage of beginning boost mode to the boost chip output end is begun to ramp up, controls the trigger switch and lead
It is logical.
6. mode switching circuit according to claim 1, which is characterized in that the negative-phase input of the error amplifier is logical
The first current source ground connection is crossed, is connect by first resistor with the output end of the boost chip；
Wherein, the output voltage of the boost chip output end and the negative that first current source is the error amplifier are defeated
Enter end and the reference voltage is provided.
7. a kind of boost chip, which is characterized in that the boost chip includes:
Mode switching circuit as claimed in any one of claims 1 to 6.
8. boost chip according to claim 7, which is characterized in that the boost chip includes:
First switch tube, second switch, BST loop control circuit, drive current source and current source loop control circuit；
The BST loop control circuit includes the mode switching circuit；
The first electrode of the first switch tube is connect with the first port of the boost chip, second electrode ground connection；It is described
First port is connected to power supply by an inductance；
The first electrode of the second switch is connect with the output end of the boost chip, second electrode and the first end
Mouth connection；The output end passes through a capacity earth；
The BST loop control circuit is connect with the grid of the grid of the first switch tube and the second switch, with
The on state of control switch pipe, and connect with the output end of the boost chip and load end, to obtain the boosting core
The load voltage of the output voltage of piece output end and the boost chip load end；
The input terminal of the drive current source is connect with the output end of the boost chip, and output end connects the boost chip
Load end, control terminal connects the current source loop control circuit.
9. boost chip according to claim 8, which is characterized in that the drive current source is third switching tube.
10. boost chip according to claim 8, which is characterized in that the load end of the boost chip is for connecting LED
Load.
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| CN109617413B (en) | 2024-03-01 |
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