CN113271013A - Buck chip drive circuit and Buck chip drive system - Google Patents
Buck chip drive circuit and Buck chip drive system Download PDFInfo
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- CN113271013A CN113271013A CN202110522347.2A CN202110522347A CN113271013A CN 113271013 A CN113271013 A CN 113271013A CN 202110522347 A CN202110522347 A CN 202110522347A CN 113271013 A CN113271013 A CN 113271013A
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The invention discloses a Buck chip driving circuit, which comprises a Buck functional circuit, a switch module and a spare diode, wherein the Buck functional circuit comprises a Buck capacitor and a Buck capacitor; the Buck functional circuit comprises a boot capacitor and a main diode connected with the boot capacitor in series, wherein the anode of the main diode is electrically connected with a constant value power supply in the Buck functional circuit, and the cathode of the main diode is electrically connected with the boot capacitor; the constant value power supply is used for providing voltage difference of an upper tube connection driver in the Buck functional circuit; the switch module is connected with the standby diode in series, the standby diode is connected with the main diode in parallel, the anode of the standby diode is electrically connected with the constant value power supply, and the cathode of the standby diode is electrically connected with the boot capacitor. The spare diode is used as redundancy of the main diode, and the switch module can ensure normal use of the Buck chip. The invention also provides a Buck chip driving system which also has the beneficial effects.
Description
Technical Field
The invention relates to the technical field of switching power supplies, in particular to a Buck chip driving circuit and a Buck chip driving system.
Background
Switching power supplies are now widely used in electronic products because of their high efficiency and high voltage regulation capability. The switching power supply can be divided into three basic types, namely Buck (voltage reduction), Boost (voltage boosting), Buck-Boost (voltage boosting) and the like, according to the basic topology of the switching power supply. The Buck chip is used in the largest scale because of the operating conditions and efficiency considerations. Taking a Buck chip as an example, the working principle of the Buck chip is that stable direct current high-voltage input is chopped into a section of pulse output through a continuous switch, so that the output voltage is reduced. In Buck chips, mosfets (metal oxide semiconductor field effect transistors) which are not switched off exist, and according to the conduction principle of mosfets, a proper driver circuit needs to be provided for the mosfets.
And a Buck chip generally has two switches Mosfet, which are called an upper tube and a lower tube, and the upper tube and the lower tube are alternately conducted to chop the input voltage. It is conceivable that one driver line needs to be provided for both the upper and lower tubes, respectively. The driver circuit is essentially an amplifier, and as an amplifier, it is necessary to secure the voltage difference between Vcc and Vss. Because the lower tube can be directly connected with a stable voltage source to ensure the voltage difference in the Buck chip due to the requirement of the chip design process, and the Vss of the upper tube generally needs to be connected with the output point sw of the pulse voltage of the Buck chip. And this capacitance is commonly referred to as the boot capacitance and is typically located outside the Buck chip.
In the practical use process, the boot capacitor is arranged outside the chip, so that the risk of being damaged by human error exists, the damage modes are various, and the short circuit is the most serious damage. For products such as servers and consumer electronics, the boot capacitors are often disposed on the back of the PCB, and the back of the PCB is directly closer to the tray of the motherboard, so that the boot capacitors are not affected by other signals and the differential pressure can be stably maintained. The tray is made of metal conductive material, and is generally set to be connected with the ground, and the potential is 0V.
If the anode of the boot capacitor is in contact with the tray due to deformation of the main board, the boot capacitor is short-circuited, and the diode connected in series with the boot capacitor is burnt by a voltage source, so that the Buck chip cannot work normally. Therefore, how to ensure the normal use of the Buck chip is an urgent problem to be solved by the technical personnel in the field.
Disclosure of Invention
The invention aims to provide a Buck chip driving circuit which can ensure the normal work of a Buck chip; another objective of the present invention is to provide a Buck chip driving system, which can ensure the normal operation of the Buck chip.
In order to solve the technical problem, the invention provides a Buck chip driving circuit, which comprises a Buck functional circuit, a switch module and a spare diode;
the Buck functional circuit comprises a boot capacitor and a main diode connected with the boot capacitor in series, wherein the anode of the main diode is electrically connected with a constant value power supply in the Buck functional circuit, and the cathode of the main diode is electrically connected with the boot capacitor; the constant value power supply is used for providing voltage difference of an upper tube connection driver in the Buck functional circuit;
the switch module is connected with the standby diode in series, the standby diode is connected with the main diode in parallel, the anode of the standby diode is electrically connected with the constant value power supply, and the cathode of the standby diode is electrically connected with the boot capacitor.
Optionally, the positive electrode of the main diode is connected to the positive electrode of the constant value power supply, the negative electrode of the main diode is connected to the boost pin of the Buck functional circuit, and one end of the boost capacitor is connected to the boost pin;
the positive pole of spare diode is connected the positive pole of definite value power, the negative pole of spare diode passes through switch module connects the boost pin.
Optionally, the main diode is a parasitic diode of a field effect transistor to which the boost pin is connected.
Optionally, the switch module is a control logic unit; the control logic unit comprises a first pin electrically connected with the boot capacitor and a second pin connected with the spare diode;
the control logic unit is used for keeping the first pin and the second pin off when the main diode works; keeping the connection between the first pin and the second pin when the main diode is damaged.
Optionally, the control logic unit is configured to detect a voltage of the first pin; when the voltage is smaller than a voltage threshold value, the connection between the first pin and the second pin is kept.
Optionally, the switch module includes a current-limiting resistor and a manual switch connected in parallel with the current-limiting resistor, and the manual switch is connected in series with the standby diode.
Optionally, the resistance value of the current limiting resistor is not lower than 1K Ω.
The invention also provides a Buck chip driving system which comprises the Buck chip driving circuit.
The Buck chip driving circuit provided by the invention comprises a Buck functional circuit, a switch module and a spare diode; the Buck functional circuit comprises a boot capacitor and a main diode connected with the boot capacitor in series, wherein the anode of the main diode is electrically connected with a constant value power supply in the Buck functional circuit, and the cathode of the main diode is electrically connected with the boot capacitor; the constant value power supply is used for providing voltage difference of an upper tube connection driver in the Buck functional circuit; the switch module is connected with the standby diode in series, the standby diode is connected with the main diode in parallel, the anode of the standby diode is electrically connected with the constant value power supply, and the cathode of the standby diode is electrically connected with the boot capacitor. The standby diode can be used as redundancy of the main diode by connecting the standby diode with the main diode in parallel, and the standby diode can be disconnected when the main diode works normally through the switch module; and when the main diode is damaged, the standby diode is switched on to work so as to ensure the normal use of the Buck chip.
The invention also provides a Buck chip driving system which also has the beneficial effects and is not repeated herein.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a circuit diagram of a Buck chip driving circuit according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a Buck chip driver circuit according to an embodiment of the present invention;
fig. 3 is a circuit diagram of another specific Buck chip driving circuit according to an embodiment of the present invention.
In the figure: 1. the circuit comprises a chopping module, a 2 LC filtering module, a 3 auxiliary module, a 4 switch module, a 40 control logic unit, a 41 first pin, a 42 second pin, a 43 third pin, a 44 fourth pin, a 45 current-limiting resistor, a 46 manual switch, an Q1. upper tube, a Q2 lower tube, a V1 constant value power supply, a C1 boot capacitor, a D1 main diode and a D2. standby diode.
Detailed Description
The core of the invention is to provide a Buck chip driving circuit. In the prior art, the lower tube in the Buck chip can be directly connected with a stable voltage source to ensure the voltage difference, and Vss of the upper tube generally needs to be connected with an output point sw of the Buck chip pulse voltage. And this capacitance is commonly referred to as the boot capacitance and is typically located outside the Buck chip. In the actual use process, since the boot capacitor is arranged outside the chip, the risk of being damaged by human error exists. When the boot capacitor is short-circuited, the diode is burnt out, and the Buck chip cannot work normally.
The Buck chip driving circuit provided by the invention comprises a Buck functional circuit, a switch module and a spare diode; the Buck functional circuit comprises a boot capacitor and a main diode connected with the boot capacitor in series, wherein the anode of the main diode is electrically connected with a constant value power supply in the Buck functional circuit, and the cathode of the main diode is electrically connected with the boot capacitor; the constant value power supply is used for providing voltage difference of an upper tube connection driver in the Buck functional circuit; the switch module is connected with the standby diode in series, the standby diode is connected with the main diode in parallel, the anode of the standby diode is electrically connected with the constant value power supply, and the cathode of the standby diode is electrically connected with the boot capacitor. The standby diode can be used as redundancy of the main diode by connecting the standby diode with the main diode in parallel, and the standby diode can be disconnected when the main diode works normally through the switch module; and when the main diode is damaged, the standby diode is switched on to work so as to ensure the normal use of the Buck chip.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a circuit diagram of a Buck chip driving circuit according to an embodiment of the present invention.
Referring to fig. 1, in the embodiment of the present invention, the Buck chip driving circuit includes a Buck functional circuit, a switching module 4, and a spare diode D2; the Buck functional circuit comprises a boot capacitor C1 and a main diode D1 connected with the boot capacitor C1 in series, wherein the anode of the main diode D1 is electrically connected with a constant-value power supply V1 in the Buck functional circuit, and the cathode of the main diode D1 is electrically connected with the boot capacitor C1; the constant value power supply V1 is a power supply for providing voltage difference of an upper tube Q1 connection driver in the Buck functional circuit; the switch module 4 is connected in series with the spare diode D2, the spare diode D2 is connected in parallel with the main diode D1, the anode of the spare diode D2 is electrically connected with the constant power supply V1, and the cathode of the spare diode D2 is electrically connected with the boot capacitor C1.
The above-mentioned Buck functional circuit, that is, the conventional Buck chip driving circuit provided in the prior art, generally includes a chopper module 1 for outputting a pulse signal, an LC filter module 2 for converting the pulse signal into a direct current signal, and an auxiliary module 3 having other functions, for example, an auxiliary control function. Chopper module 1 generally includes upper tube Q1, lower tube Q2, driver connected to upper tube Q1, driver connected to lower tube Q2, constant voltage source V1 for providing a stable voltage difference and driving upper tube Q1 and lower tube Q2 via the drivers, boot capacitor C1 for stabilizing the voltage difference between upper tube Q1Vcc and Vss, and main diode D1 connected in series with boot capacitor C1. For the specific structure of the Buck functional circuit, reference may be made to the prior art, and details thereof are not repeated here.
In the embodiment of the present invention, the anode of the main diode D1 is electrically connected to the constant value power source V1, and the cathode of the main diode D1 is electrically connected to the boot capacitor C1, i.e. the main diode D1 is usually connected in series between the constant value power source V1 and the boot capacitor C1, and the constant value power source V1 is usually used to simultaneously provide the voltage difference of the upper tube Q1 connected to the driver and the voltage difference of the lower tube Q2 connected to the driver in the Buck function circuit. In the embodiment of the present invention, the voltage supplied by the constant power source V1 is usually constant at 5V.
The switch modules 4 are connected in series with each other by a spare diode D2, the spare diode D2 is connected in parallel with the main diode D1, and the spare diode D2 is also connected in series between the constant power source V1 and the boot capacitor C1 for redundancy of the main diode D1. In the embodiment of the present invention, the switch module 4 is used for switching off the spare diode D2 when the main diode D1 is operated; the spare diode D2 is turned on when the main diode D1 is broken. When the main diode D1 is damaged, the switch module 4 may turn on the spare diode D2, so that the spare diode D2 may replace the main diode D1 for operating, so that the Buck chip driving circuit may operate normally. In the Buck chip driving circuit according to the present invention, the main diode D1 and the spare diode D2 need to have the same anode and cathode directions.
In general, in the embodiment of the present invention, the anode of the main diode D1 is connected to the anode of the constant-value power supply V1, the cathode of the main diode D1 is connected to the boost pin of the Buck function circuit, and one end of the boost capacitor C1 is connected to the boost pin; the anode of the spare diode D2 is connected with the anode of the constant value power supply V1, and the cathode of the spare diode D2 is connected with the boost pin through the switch module 4.
The boost pin is a pin connected to the outside of the Buck chip, and the voltage of the boost pin can be controlled through a circuit outside the Buck chip. In the embodiment of the present invention, the positive electrode of the main diode D1 is connected to the positive electrode of the constant value power source V1, and the negative electrode of the main diode D1 is connected to the boost pin, that is, the main diode D1 is normally connected in series in the forward direction between the constant value power source V1 and the boost pin; one end of the boot capacitor C1 is connected to the boot pin, i.e., the boot capacitor C1 is usually connected in series between the boot pin and the output point sw of the pulse voltage. Accordingly, in the embodiment of the present invention, the spare diode D2 is usually connected in series between the constant power source V1 and the boost pin, that is, the positive electrode of the spare diode D2 is connected to the positive electrode of the constant power source V1, the negative electrode of the spare diode D2 is usually connected to the switch module 4 first, and one end of the switch module 4 is then connected to the boost pin.
Specifically, the main diode D1 may be a parasitic diode of a field effect transistor connected to the boost pin. The field effect transistor connected to the boost pin is used to realize the control of the boost pin, and the parasitic diode of the field effect transistor can be used as the main diode D1, so that the driver connected to the upper tube Q1 can obtain a stable voltage difference in cooperation with the boot capacitor C1.
The Buck chip driving circuit provided by the invention comprises a Buck functional circuit, a switch module 4 and a spare diode D2; the Buck functional circuit comprises a boot capacitor C1 and a main diode D1 connected with the boot capacitor C1 in series, wherein the anode of the main diode D1 is electrically connected with a constant-value power supply V1 in the Buck functional circuit, and the cathode of the main diode D1 is electrically connected with a boot capacitor C1; the constant value power supply V1 is used for providing a voltage difference of an upper tube Q1 connected driver in the Buck functional circuit; the switch module 4 is connected in series with a spare diode D2, a spare diode D2 is connected in parallel with a main diode D1, the anode of the spare diode D2 is electrically connected with a constant-value power supply V1, and the cathode of the spare diode D2 is electrically connected with a boot capacitor C1. The spare diode D2 can be made redundant to the main diode D1 by connecting the spare diode D2 in parallel with the main diode D1, and the spare diode D2 can be turned off by the switching module 4 when the main diode D1 is operating normally; and when the main diode D1 is damaged, the spare diode D2 is switched on to work so as to ensure the normal use of the Buck chip.
The details of the Buck chip driving circuit provided by the present invention will be described in detail in the following embodiments of the present invention.
Referring to fig. 2, fig. 2 is a circuit diagram of a specific Buck chip driving circuit according to an embodiment of the present invention.
In contrast to the above-described embodiment of the invention, the embodiment of the invention further introduces a specific structure of the switch module 4 on the basis of the above-described embodiment of the invention. The rest of the contents are already described in detail in the above embodiments of the present invention, and are not described herein again.
Referring to fig. 2, in the embodiment of the present invention, the switch module 4 is a control logic unit 40; the control logic unit 40 comprises a first pin 41 electrically connected with the boot capacitor C1, and a second pin 42 connected with the spare diode D2; the control logic unit 40 is configured to keep the first pin 41 and the second pin 42 off when the main diode D1 is activated; the connection between the first pin 41 and the second pin 42 is maintained when the main diode D1 is broken.
The switch module 4 may be specifically a Control Logic unit 40(Control Logic), and the first pin 41 of the Control Logic unit 40 needs to be electrically connected to a boot capacitor C1, and is usually connected to the boot pin; the second pin 42 of the control logic unit 40 is usually connected to the cathode of the spare diode D2, so that the structure of the control logic unit 40 with the spare diode D2 connected in series with each other can be connected in parallel with the main diode D1 as a redundant structure of the main diode D1.
The control logic unit 40 may be configured to keep the first pin 41 and the second pin 42 off when the main diode D1 is activated, that is, the switch module 4 is in an off state, so as to disconnect the spare diode D2; when the main diode D1 is damaged, the first pin 41 and the second pin 42 are kept on, even if the spare diode D2 is connected into the circuit for use, the normal operation of the Buck chip driving circuit is ensured. The specific structure of the control logic unit 40 may refer to the prior art, as long as the above functions can be achieved, and is not particularly limited in the embodiment of the present invention.
Specifically, in the embodiment of the present invention, the control logic unit 40 is configured to detect a voltage of the first pin 41; when the voltage is less than a voltage threshold, the connection between the first pin 41 and the second pin 42 is maintained. The control logic unit 40 may detect the voltage at the first pin 41, i.e. the voltage at the boot capacitor C1, in real time. When the voltage is too low to be less than the voltage threshold, it means that the boot capacitor C1 is shorted to ground and the main diode D1 has been burned out. At this time, the control logic unit 40 may be enabled to keep the connection between the first pin 41 and the second pin 42, i.e., to ensure the connection of the spare diode D2, so that the spare diode D2 may continue to operate in the circuit instead of the main diode D1.
Normally, the control logic unit 40 further includes a third pin 43 for reporting an error and sending a fault signal to the Buck chip control center, and a fourth pin 44 for receiving a control signal sent by the Buck chip control center. When the control logic unit 40 detects that the voltage at the first pin 41 is smaller than the voltage threshold, the fault signal is sent to the Buck chip control center through the third pin 43, and after the fault signal is received by the corresponding Buck chip control center, a delay of a certain time can be set according to user definition to automatically send the control signal to the fourth pin 44, or the control signal is sent to the fourth pin 44 through a register switch defined by the user through user operation. The control logic unit 40 may turn on the switch between the first pin 41 and the second pin 42 after receiving the control signal through the fourth pin 44, and then maintain it. It should be noted that, when the voltage of the first pin 41 is not less than the voltage threshold, the control logic unit 40 generally needs to ensure the turn-off between the first pin and the second pin 42.
According to the Buck chip driving circuit provided by the invention, the control logic unit 40 is arranged, so that the spare diode D2 can be automatically conducted after the main diode D1 is damaged, and the normal use of the Buck chip driving circuit is ensured.
The details of the Buck chip driving circuit provided by the present invention will be described in detail in the following embodiments of the present invention.
Referring to fig. 3, fig. 3 is a circuit diagram of another specific Buck chip driving circuit according to an embodiment of the present invention.
In contrast to the above-described embodiment of the invention, the embodiment of the invention further introduces a specific structure of the switch module 4 on the basis of the above-described embodiment of the invention. The rest of the contents are already described in detail in the above embodiments of the present invention, and are not described herein again.
Referring to fig. 3, in the embodiment of the present invention, the switch module 4 includes a current limiting resistor 45 and a manual switch 46 connected in parallel with the current limiting resistor 45, and the manual switch 46 is connected in series with the spare diode D2. The switch module 4 may be a current limiting resistor 45 connected in parallel with the manual switch 46, one end of the current limiting resistor 45 is usually connected to the cathode of the spare diode D2, and the other end is electrically connected to the boot capacitor C1, so that the current limiting resistor is connected in series with the spare diode D2. Accordingly, the manual switch 46 is connected in parallel with the backup diode D2 and in series with the backup diode D2, and functions to control the on/off of the current limiting resistor 45.
In the embodiment of the present invention, the resistance value of the current limiting resistor 45 is usually not lower than 1K Ω. Under normal conditions, the current limiting resistor 45 has a large resistance value, so that the spare diode D2 is equivalent to an open circuit when the main diode D1 is in normal operation. At this time, the manual switch 46 needs to be in an off state. When the boot capacitor C1 is short-circuited, the spare diode D2 is not damaged due to the existence of the current limiting resistor 45. When the standby diode D2 needs to be activated, the standby diode D2 can participate in the operation only by turning on the manual switch 46 to short the current limiting resistor 45.
According to the Buck chip driving circuit provided by the invention, the effect of the switch module 4 can be realized by arranging the current-limiting resistor 45 and the manual switch 46. The structure is very simple and easy to set.
On the basis of the above embodiment, the embodiment of the present invention further provides a Buck chip driving system, including the Buck chip driving circuit described above.
It should be noted that the Buck chip driving system provided in the present embodiment has the same beneficial effects as the Buck chip driving circuit provided in the above embodiment, and for the specific description of the Buck chip driving circuit related in the present embodiment, please refer to the above embodiment, which is not described herein again.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be 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. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, 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 process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The Buck chip driving circuit and the Buck chip driving system provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (8)
1. A Buck chip driving circuit is characterized by comprising a Buck functional circuit, a switch module and a spare diode;
the Buck functional circuit comprises a boot capacitor and a main diode connected with the boot capacitor in series, wherein the anode of the main diode is electrically connected with a constant value power supply in the Buck functional circuit, and the cathode of the main diode is electrically connected with the boot capacitor; the constant value power supply is used for providing voltage difference of an upper tube connection driver in the Buck functional circuit;
the switch module is connected with the standby diode in series, the standby diode is connected with the main diode in parallel, the anode of the standby diode is electrically connected with the constant value power supply, and the cathode of the standby diode is electrically connected with the boot capacitor.
2. The Buck chip driving circuit according to claim 1, wherein an anode of the main diode is connected to an anode of the constant value power supply, a cathode of the main diode is connected to a boost pin of the Buck functional circuit, and one end of the boost capacitor is connected to the boost pin;
the positive pole of spare diode is connected the positive pole of definite value power, the negative pole of spare diode passes through switch module connects the boost pin.
3. The Buck chip driver circuit according to claim 2, wherein the main diode is a parasitic diode of a field effect transistor to which the boost pin is connected.
4. The Buck chip driving circuit according to any of claims 1 to 3, wherein the switch module is a control logic unit; the control logic unit comprises a first pin electrically connected with the boot capacitor and a second pin connected with the spare diode;
the control logic unit is used for keeping the first pin and the second pin off when the main diode works; keeping the connection between the first pin and the second pin when the main diode is damaged.
5. The Buck chip driving circuit according to claim 4, wherein the control logic unit is configured to detect a voltage of the first pin; when the voltage is smaller than a voltage threshold value, the connection between the first pin and the second pin is kept.
6. The Buck chip driving circuit according to any of claims 1 to 3, wherein the switching module comprises a current limiting resistor and a manual switch connected in parallel with the current limiting resistor, the manual switch being connected in series with the standby diode.
7. The Buck chip driving circuit according to claim 6, wherein the resistance value of the current limiting resistor is not lower than 1K Ω.
8. A Buck chip driving system comprising the Buck chip driving circuit according to any one of claims 1 to 7.
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| CN113271013B (en) | 2022-06-03 |
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