CN109617413B - Boost chip and mode switching circuit thereof - Google Patents
Boost chip and mode switching circuit thereof Download PDFInfo
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- CN109617413B CN109617413B CN201910091818.1A CN201910091818A CN109617413B CN 109617413 B CN109617413 B CN 109617413B CN 201910091818 A CN201910091818 A CN 201910091818A CN 109617413 B CN109617413 B CN 109617413B
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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 boost chip and a mode switching circuit thereof, wherein the mode switching circuit is provided with a compensation current source, when the boost chip is switched from a through mode to a boost mode, a compensation capacitor can be charged through the compensation current source, so that the voltage rising speed of the output end of an error amplifier can be improved, further, the current compensation of a load can be carried out, and the problem that the load current gradually decreases and gradually rises again when the boost chip is switched from the through mode to the boost mode is avoided, so that the load can work normally.
Description
Technical Field
The present invention relates to the field of integrated circuits, and more particularly, to a boost chip and a mode switching circuit thereof.
Background
The DCDC chip is a switching power supply chip, and generally performs high-frequency switching through a controllable switching tube (MOS, etc.) by utilizing the energy storage characteristics of a capacitor and an inductor, and stores input electric energy in the capacitor (or the inductor), and when the switch is turned off, the electric energy is released to a load to provide energy. The DCDC chip mainly includes a BOOST (BST) converter and a Buck (Buck) converter.
After the chip is started, the BST converter works in a through mode by default, and when detecting that the current source voltage difference meets the mode switching condition, the BST converter needs to be switched to a boost mode. After the BST converter is switched from the through mode to the boost mode, the load current is gradually reduced and gradually increased in the process of increasing the output voltage.
Disclosure of Invention
In view of the above, the technical scheme of the invention provides a boost chip and a mode switching circuit thereof, which solve the problem that the load current is reduced and gradually increased when the boost chip is switched from a through mode to a boost mode.
In order to achieve the above object, the present invention provides the following technical solutions:
a mode switching circuit of a boost chip for powering a load, the mode switching circuit comprising:
the error amplifier is provided with a positive phase input end, a negative phase input end and an output end, wherein the negative phase input end inputs reference voltage, and the positive phase input end is connected with the load so as to input the voltage of the load;
one end of the compensation capacitor is connected with the output end of the error amplifier, and the other end of the compensation capacitor is grounded;
and the compensation current source is used for charging the compensation capacitor when the boost chip is switched from the through mode to the boost mode, so that the voltage rising speed of the output end of the error amplifier is increased, and the load is subjected to current supplementation.
Preferably, in the mode switching circuit, the compensation capacitor is connected to the output terminal of the error amplifier through a compensation resistor.
Preferably, in the mode switching circuit, the compensation current source is grounded through the compensation capacitor and is connected to the output terminal of the error amplifier through the compensation resistor.
Preferably, in the above mode switching circuit, the compensation current source is connected to the compensation capacitor through a trigger switch, and the trigger switch performs a switching action based on a trigger signal;
the trigger signal controls the trigger switch to be conducted in a set time period when the boost chip is switched from the through mode to the boost mode.
Preferably, in the mode switching circuit, the trigger switch is controlled to be turned on in a period from when the boost chip starts the boost mode to when the output voltage at the output end of the boost chip starts to rise.
Preferably, in the mode switching circuit, a negative phase input end of the error amplifier is grounded through a first current source and is connected with an output end of the boost chip through a first resistor;
the output voltage of the output end of the boost chip and the first current source provide the reference voltage for the negative phase input end of the error amplifier.
The invention also provides a boost chip, which comprises:
the mode switching circuit of any one of the above.
Preferably, in the above-mentioned booster chip, the booster chip includes: the switching circuit comprises a first switching tube, a second switching tube, a BST loop control circuit, a driving current source and a current source loop control circuit;
the BST loop control circuit comprises the mode switching circuit;
a first electrode of the first switching tube is connected with a first port of the boost chip, and a second electrode of the first switching tube is grounded; the first port is connected with a power supply through an inductor;
a first electrode of the second switching tube is connected with the output end of the boost chip, and a second electrode of the second switching tube is connected with the first port; the output end is grounded through a capacitor;
the BST loop control circuit is connected with the grid electrode of the first switching tube and the grid electrode of the second switching tube to control the conduction state of the switching tube, and is connected with the output end and the load end of the boost chip to acquire the output voltage of the output end of the boost chip and the load voltage of the load end of the boost chip;
the input end of the driving current source is connected with the output end of the boosting chip, the output end of the driving current source is connected with the load end of the boosting chip, and the control end of the driving current source is connected with the current source loop control circuit.
Preferably, in the boost chip, the driving current source is a third switching tube.
Preferably, in the boost chip, a load end of the boost chip is used for connecting an LED load.
As can be seen from the above description, the boost chip and the mode switching circuit thereof provided by the technical scheme of the invention have at least the following beneficial effects:
in the boost chip, the mode switching circuit is provided with a compensation current source, when the boost chip is switched from the through mode to the boost mode, the compensation current source can charge the compensation capacitor, so that the voltage rising speed of the output end of the error amplifier can be improved, the load can be further subjected to current compensation, and the problem that the load current gradually decreases and gradually rises again when the boost chip is switched from the through mode to the boost mode is avoided, so that the load can work normally.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic circuit diagram of a boost chip according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a mode switching circuit in the boost chip of FIG. 1;
FIG. 3 is a timing diagram of the boost chip of FIG. 1;
FIG. 4 is a waveform diagram of steady-state operation of the boost chip in a valley current mode control mode;
fig. 5 is a schematic structural diagram of a mode switching circuit according to an embodiment of the present invention;
fig. 6 is a timing diagram corresponding to the mode switching circuit shown in fig. 5.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As described in the background art, when the conventional boost chip is switched from the through mode to the boost mode, the load current gradually decreases and gradually increases during the rising process of the output voltage, which is not desirable for some load applications. The circuit configuration and the operation principle of the booster chip will be described below.
Referring to fig. 1, fig. 1 is a schematic circuit structure diagram of a boost chip according to an embodiment of the present invention, where the boost chip includes: a first port corresponding to the voltage signal SW, a second port corresponding to the power voltage VIN, an output terminal corresponding to the output voltage VOUT, a load terminal for connecting to a load, a ground terminal for Grounding (GND), and two interfaces for connecting to a host. The two interfaces are connected with the host through the control line SCL and the data line SDA respectively. The output terminal is grounded through a capacitor Cout. The first port is connected with the positive electrode of the power supply E through the inductor L, and the second port is directly connected with the positive electrode of the power supply E. The load terminal is used to connect a load, which is illustrated in fig. 1 as a flash lamp (e.g., LED), and corresponds to the voltage signal VLED, and the load includes, but is not limited to, an LED.
The boost chip has a plurality of functional block circuits inside, including but not limited to those shown in fig. 1: the switching circuit comprises a first switching tube M1, a second switching tube M2, a BST loop control circuit, a driving current source and a current source loop control circuit. In fig. 1, a third switching transistor M3 is used as a driving current source. The first electrode of the first switching tube M1 is connected with the first port of the boost chip, and the second electrode of the first switching tube M1 is grounded. The first electrode of the second switching tube is connected with the output end of the boost chip, and the second electrode of the second switching tube is connected with the first port of the boost chip. The input end of the driving current source is connected with the output end of the boosting chip, and the output end of the driving current source is connected with the load end of the boosting chip. The BST loop control circuit is respectively connected with the grid electrode of the first switching tube, the grid electrode of the second switching tube and the output end of the second switching tube and is used for controlling the conduction states of the two switching tubes based on the output voltage VOUT. The current source loop control circuit is connected with the control end of the driving current source and used for controlling the conduction state of the driving current source. The BST loop control circuit acts as a BST transformer. The third switching transistor M3 in fig. 1 is a PMOS, and fig. 1 shows a driving scheme of the BST converter and the PMOS current source.
When the boost chip is used as a flash driving chip, the load currents required to be driven in different usage scenarios are different, and in order to improve the conversion efficiency of the flash driving chip, the main stream is the BST converter and PMOS current source structure shown in fig. 1. When a small current is required, the BST loop control circuit works in a straight-through mode, at the moment, the second switching tube M2 is turned on, and the first switching tube M1 is turned off. When a large current is required, the BST loop control circuit works in a boost mode, and the voltage drop on the driving current source is maintained at a fixed voltage VHR, so that the overall conversion efficiency is improved. vhr=vout-VLED, typically, VHR is a reference voltage that gives consideration to both current accuracy and efficiency, and may take a value of 400mV.
After starting, the BST loop control circuit works in a through mode by default, and when detecting that the voltage difference of the driving current source is smaller than VHR (the voltage difference between the input end and the output end of the driving current source), the BST loop control circuit is switched to a boosting mode. Since the load current is already relatively large when switching to boost mode is required, the switching speed is as fast as possible. However, for simplicity of compensation, the BST loop control circuit is controlled by a current mode control (valley or peak), and in view of smooth switching between the through mode and the boost mode, the valley current mode control is more commonly used, because the valley current mode control can theoretically start from zero in duty cycle. For flash lamp driving chips, the duty ratio required by the boost chip system is small when the flash lamp driving chip works between the through mode and the boost mode for a long time, especially when the flash lamp driving chip is critical, so that the valley current mode control mode is more suitable for the chips. Wherein, the duty ratio refers to the time proportion of the high potential maintaining time to one period.
Referring to fig. 2, fig. 2 is a schematic diagram of a mode switching circuit in the boost chip shown in fig. 1, and the mode switching circuit shown in fig. 2 includes: error amplifier, compensation capacitor Cc, compensation resistor Rc, resistor R1 and current source I0. The positive phase input end of the error amplifier is connected with the load section of the boost chip, the negative phase input end of the error amplifier is grounded through a current source I0 and is connected with the output end of the boost chip through a resistor R1 so as to be connected with the voltage VOUT of the output end. The voltage at the negative input is equal to VOUT-VHR. The output voltage of the output end of the error amplifier is connected with one end of a compensation resistor Rc, and the other end of the compensation resistor Rc is grounded through a compensation capacitor Cc. The output terminal of the error amplifier outputs a voltage signal EAOUT. The error amplifier shown in fig. 2 is an internal error amplifier of the BST loop control circuit in the boost chip.
In the boost chip, the BST loop control circuit needs the internal error amplifier to work normally in the boost mode, and in order to stabilize the boost chip system, the transconductance gm of the error amplifier is smaller, and the output end of the error amplifier needs to be connected with a compensation capacitor Cc. When the through mode is switched to the boost mode, the compensation capacitor Cc charges slowly, so that the switching speed is slow, and during this period, the current of the load LED gradually decreases and then gradually increases, as shown in fig. 3, fig. 3 is a timing chart of the boost chip shown in fig. 1, the BST loop control circuit starts to perform mode switching at the time corresponding to the function time corresponding to the left broken line, and the voltage drop of the driving current source is always maintained at the fixed voltage VHR when the boost mode is switched to the through mode, and during the rising process of the output voltage VOUT, a pit is dropped under the current ILED of the LED, that is, the problem that the current ILED of the LED gradually decreases and then gradually increases occurs, and the current ILED of the LED is not smooth enough, which is not desirable for some applications using a flash lamp.
In order to stabilize the boost chip system, the transconductance gm of the error amplifier is relatively small (for example, only 10 μs is generally used), and the compensation capacitor Cc is relatively large (for example, 80 μf is generally used), so that the slew rate of the output voltage EOUT is relatively small, the rising speed of the output voltage EOUT is slow, and the switching circuit for switching the BST loop control circuit from the pass-through mode to the boost mode is affected.
The rising speed of the output voltage EOUT is slower, because the valley current mode control mode is adopted, the switching action is started only when the trigger voltage signal Vramp in the BST loop control circuit touches the output voltage signal ROUT, so that the first switching tube M1 is turned on, the second switching tube M2 is turned off, the inductance L starts to store energy to boost the output voltage VOUT, the slower the rising speed of the output voltage EOUT is, the longer the transition time is, the larger the pit dropped under the load current ILED is, and the working waveform of the valley current mode control mode is shown in fig. 4. Wherein, the current mode refers to a fixed frequency control mode of the feedback information of the current information.
Referring to fig. 4, fig. 4 is a waveform diagram of steady-state operation of the boost chip in a valley current mode control mode, where the trigger voltage signal Vramp corresponds to a rising edge of the on-chip pulse modulation signal PWM when the trigger voltage signal Vramp touches the output voltage signal ROUT, and the rising edge of the voltage signal SW corresponds to a rising edge of the internal clock signal CLK. The falling edge of the voltage signal SW starts to increase the inductor current IL and the rising edge of the voltage signal SW starts to decrease the inductor current IL. When the rising edge of the clock signal CLK arrives, the second switching tube M2 is turned on, the inductance current IL starts to fall, when the trigger signal Vramp touches the output voltage EOUT, the second switching tube M2 is turned off, the first switching tube M1 is turned on, the inductance current IL starts to rise, the process is repeated continuously, and the voltage and the current required by the load are output stably.
The embodiment of the invention provides a mode switching circuit capable of accelerating the switching of a boost chip from a through mode to a boost mode, and solves the problem that load current gradually drops and then gradually rises in the rising process of output voltage OUT.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a mode switching circuit according to an embodiment of the present invention, where the mode switching circuit is used for a boost chip, and the mode switching circuit includes: the error amplifier is provided with a positive phase input end, a negative phase input end and an output end, wherein the negative phase input end inputs reference voltage, and the positive phase input end is connected with the load so as to input the voltage of the load; one end of the compensation capacitor Cc is connected with the output end of the error amplifier, and the other end of the compensation capacitor Cc is grounded; and the compensation current source I1 is used for charging the compensation capacitor Cc when the boost chip is switched from the through mode to the boost mode, so that the rising speed of the voltage EOUT at the output end of the error amplifier is increased, and the load is subjected to current supplementation.
The load of the boost chip can be an LED, and the voltage VLED at two ends of the LED is input to the non-inverting input end of the error amplifier. The reference voltage is VOUT-VHR.
The compensation capacitor Cc is connected to the output of the error amplifier through a compensation resistor Rc. The compensation current source I1 is grounded through the compensation capacitor and is connected with the output end of the error amplifier through the compensation resistor Rc.
The compensation current source I1 is connected with the compensation capacitor Cc through a trigger switch K, and the trigger switch K executes switching action based on a trigger signal PTB-PULSE; the trigger signal PTB-PULSE controls the trigger switch to be conducted in a set time period when the boost chip is switched from a through mode to a boost mode. And the trigger signal PTB-PULSE is controlled to be conducted by the trigger switch K in a period from the start of the boosting mode of the boosting chip to the start of rising of the output voltage of the output end of the boosting chip.
The negative phase input end of the error amplifier is grounded through a first current source I0 and is connected with the output end of the boost chip through a first resistor R1 so as to input and output voltage VOUT; the output voltage VOUT at the output end of the boost chip and the first current source I0 provide the reference voltage for the negative phase input end of the error amplifier. The voltage drop across the first resistor R1 is a fixed voltage VHR, and the first current source I0 is a controllable current source.
Referring to fig. 6, fig. 6 is a timing diagram corresponding to the mode switching circuit shown in fig. 5, and the reason why the speed of switching the through mode to the boost mode is slow is that the slew rate of the error amplifier in the BST loop control circuit is relatively small, in the embodiment of the present invention, the compensation current source I1 is injected into the upper end of the compensation capacitor Cc to charge the compensation capacitor Cc, so that the rising speed of the output voltage EOUT of the error amplifier can be increased, and the slew rate of the error amplifier can be increased. In the embodiment of the invention, the compensation current source I1 is used for increasing the rising speed of the output voltage EOUT, and needs to be connected with the output end of the error amplifier, and the compensation current source I1 can be directly connected with the output end of the error amplifier, but in order not to affect the normal operation of the boost chip system, the time points of the addition and the withdrawal of the compensation current source I1 need to be reasonably controlled, so that the preferred arrangement is as shown in fig. 5, and the compensation current source I1 is connected with the output end of the error amplifier through the compensation resistor Rc. In this way, the injection start timing (the rising edge of the trigger signal PTB-PULSE) of the compensation current source I1 triggers the pass-through mode to the threshold point of the boost mode (the timing at which the pass-through mode is switched to the boost mode), and the injection withdrawal point of the compensation current source I1 is after the switching operation corresponding to the first PULSE modulation signal PWM occurs. The additional compensation current source I1 does not have any influence on the normal operation of the boost chip system. The magnitude of the compensation current source I1 is related to the magnitude of the compensation capacitor Cc used in the boost chip system and the desired switching time, and may be 10 μa in this application.
The trigger signal PTB-PULSE is a control signal for controlling whether the compensation current source I1 is injected or not, when the detection circuit in the chip detects that VOUT-VLED is smaller than VHR, the trigger signal PTB-PULSE becomes high potential, and after the boost chip system starts PWM switching action, the trigger signal PTB-PULSE becomes low potential, so that the compensation auxiliary function is completed.
As can be seen from the above description, the mode switching circuit according to the technical scheme of the present invention can improve the switching speed of the boost chip in the valley current mode control mode from the through mode to the boost mode.
Based on the above embodiment, another embodiment of the present invention further provides a boost chip, where the boost chip includes the mode switching circuit described in the above embodiment.
The structure of the boost chip may be as shown in fig. 1, and the boost chip includes: the switching circuit comprises a first switching tube M1, a second switching tube M2, a BST loop control circuit, a driving current source and a current source loop control circuit; the driving current source is a third switching tube M3. The load end of the boost chip is used for being connected with an LED load. Each switching tube may be a power switching tube. In fig. 1, the first switching tube M1 is an NMOS, the second switching tube M2 is a PMOS, and the third switching tube M3 is a PMOS. The types of the switching tubes are not limited to those shown in fig. 1, and when the types of the switching tubes are different, the phases of the corresponding gate control signals are opposite. As described above, the first electrode of the first switching tube M1 is connected to the first port of the boost chip, and the second electrode thereof is grounded; the first port is connected with a power supply E through an inductor L; a first electrode of the second switching tube M2 is connected with the output end of the boost chip, and a second electrode of the second switching tube M2 is connected with the first port; the output terminal is grounded through an electric Cout capacitor.
The BST loop control circuit is connected with the grid electrode of the first switching tube M1 and the grid electrode of the second switching tube M2 to control the conduction state of the switching tube, and is connected with the output end and the load end of the boost chip to acquire the output voltage of the output end of the boost chip and the load voltage of the load end of the boost chip. The input end of the driving current source is connected with the output end of the boosting chip, the output end of the driving current source is connected with the load end of the boosting chip, and the control end of the driving current source is connected with the current source loop control circuit.
The difference from fig. 1 is that the BST loop control circuit includes the mode switching circuit, which is shown in fig. 5. The output voltage EOUT of the error amplifier generates gate voltage signals for controlling the first switching tube M1 and the second switching tube through other functional circuits of the BST loop control circuit so as to control the switching states of the two switching tubes, thereby realizing the regulation and control of the driving current source and further realizing the regulation and control of the load current.
The boost chip provided by the embodiment of the invention comprises the mode switching circuit, has higher switching speed when the boost mode is switched from the direct-current mode, avoids the problem that the load current gradually drops and then rises in the rising process of the output voltage VOUT, and ensures the normal and reliable operation of the load of the boost chip.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. The boost chip disclosed in the embodiment corresponds to the mode switching circuit disclosed in the embodiment, so that the description is simpler, and the relevant parts refer to the corresponding part of the mode switching circuit.
It is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in an article or apparatus that comprises such element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A mode switching circuit of a boost chip for powering a load, the mode switching circuit comprising:
the error amplifier is provided with a positive phase input end, a negative phase input end and an output end, wherein the negative phase input end inputs reference voltage, and the positive phase input end is connected with the load so as to input the voltage of the load;
one end of the compensation capacitor is connected with the output end of the error amplifier, and the other end of the compensation capacitor is grounded;
the compensation current source is used for charging the compensation capacitor when the boost chip is switched from the through mode to the boost mode, and improving the voltage rising speed of the output end of the error amplifier so as to supplement the current to the load;
the compensation capacitor is connected with the output end of the error amplifier through a compensation resistor;
the negative phase input end of the error amplifier is grounded through a first current source and is connected with the output end of the boost chip through a first resistor; the output voltage of the output end of the boost chip and the first current source provide the reference voltage for the negative phase input end of the error amplifier.
2. The mode switching circuit of claim 1, wherein the compensation current source is coupled to ground through the compensation capacitor and to the output of the error amplifier through the compensation resistor.
3. The mode switching circuit of claim 1, wherein the compensation current source is connected to the compensation capacitor through a trigger switch;
the trigger switch executes a switching action based on the trigger signal;
and the trigger signal controls the trigger switch to be conducted in a set time period when the boost chip is switched from the through mode to the boost mode.
4. A mode switching circuit according to claim 3, wherein the trigger switch is controlled to be turned on in a period from when the boost chip starts the boost mode to when the output voltage of the output terminal of the boost chip starts to rise.
5. A boost chip, the boost chip comprising:
a mode switching circuit as claimed in any one of claims 1 to 4.
6. The boost die of claim 5, wherein the boost die comprises:
the switching circuit comprises a first switching tube, a second switching tube, a BST loop control circuit, a driving current source and a current source loop control circuit;
the BST loop control circuit comprises the mode switching circuit;
a first electrode of the first switching tube is connected with a first port of the boost chip, and a second electrode of the first switching tube is grounded; the first port is connected with a power supply through an inductor;
a first electrode of the second switching tube is connected with the output end of the boost chip, and a second electrode of the second switching tube is connected with the first port; the output end is grounded through a capacitor;
the BST loop control circuit is connected with the grid electrode of the first switching tube and the grid electrode of the second switching tube to control the conduction state of the switching tube, and is connected with the output end and the load end of the boost chip to acquire the output voltage of the output end of the boost chip and the load voltage of the load end of the boost chip;
the input end of the driving current source is connected with the output end of the boosting chip, the output end of the driving current source is connected with the load end of the boosting chip, and the control end of the driving current source is connected with the current source loop control circuit.
7. The boost chip of claim 6, wherein the drive current source is a third switching tube.
8. The boost chip of claim 6, wherein a load terminal of the boost chip is configured to connect to an LED load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910091818.1A CN109617413B (en) | 2019-01-30 | 2019-01-30 | Boost chip and mode switching circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910091818.1A CN109617413B (en) | 2019-01-30 | 2019-01-30 | Boost chip and mode switching circuit thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109617413A CN109617413A (en) | 2019-04-12 |
| CN109617413B true CN109617413B (en) | 2024-03-01 |
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| CN112018863B (en) * | 2020-08-31 | 2023-02-14 | 广州极飞科技股份有限公司 | Power supply adjusting circuit and power supply device |
| CN114286473A (en) * | 2021-12-20 | 2022-04-05 | 启攀微电子（上海）有限公司 | Innovative flash lamp driving structure |
| CN117118236B (en) * | 2023-10-19 | 2024-02-02 | 上海芯龙半导体技术股份有限公司 | Power chip and power supply structure |
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