CN112701898B - Slow starting circuit control method and device - Google Patents
Slow starting circuit control method and device Download PDFInfo
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- CN112701898B CN112701898B CN201911038575.1A CN201911038575A CN112701898B CN 112701898 B CN112701898 B CN 112701898B CN 201911038575 A CN201911038575 A CN 201911038575A CN 112701898 B CN112701898 B CN 112701898B
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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
- H02M1/36—Means for starting or stopping converters
Abstract
The invention discloses a method and a device for controlling a slow start circuit, which are different from the prior art in that overload or short circuit of a load is considered. When the slow starting circuit is connected with the switching power supply, whether a load connected with the slow starting circuit is in a heavy load or short circuit state or not is judged firstly, if the load connected with the slow starting circuit is in the heavy load or short circuit state, the slow starting circuit is immediately turned off, and a path between the switching power supply and the load is cut off so as to protect electronic devices in the circuit. And if the load connected with the slow starting circuit is not in a heavy load or short circuit state, carrying out closed-loop chopping control on the slow starting circuit to realize the slow starting of the switching power supply circuit.
Description
Technical Field
The present invention relates to the field of power supply circuits, and in particular, to a method and an apparatus for controlling a slow start circuit.
Background
At present, most of input circuits of the switching power supply adopt a rectification and filtering mode, and at the moment when the power supply is just switched on, the initial voltage of a capacitor in a rectification and filtering circuit is 0, so that a large impact current can be generated instantly, and other devices in a circuit board can be damaged due to the fact that the impact current is too large or the impact time is too long. Therefore, a slow start circuit is required to be provided at the switching power supply, and the existing slow start circuit has many forms. Generally, a thermistor anti-impact current circuit, an SCR-R circuit or a circuit designed by using MOS tubes can be used.
The way to design a circuit with MOS transistors is to design a soft start circuit with MOS transistors. The MOS tube has the characteristics of low on-resistance Rds and simple driving, and a slow start circuit can be formed by adding a small number of components such as clamping diodes, resistors and capacitors on the periphery. In the mode, because the circuit is simple and has a single function, when the circuit generates overvoltage and overcurrent problems, devices are easily burnt, the current highly integrated circuit board is considered, the layout size of the circuit is also very important, and the circuit needs a large space. If a device in the circuit is damaged, the whole circuit will not work, and the risk is high.
In order to solve the above problems, patent CN201710067557 proposes a switch power supply slow start circuit and a control method, where the switch power supply slow start circuit includes: the controller is sequentially arranged on the rectification filter circuit, the voltage sampling unit and the MOS tube on the output circuit of the switching power supply; the controller comprises a sampling voltage input end and a control voltage output end, the sampling voltage input end is connected with the voltage sampling unit, and the control voltage output end is connected with the base electrode of the MOS tube; the controller is used for outputting a starting voltage through the control voltage output end to control the conduction of the MOS tube when the voltage value of the sampling voltage input end is less than or equal to a preset threshold value so as to enable an output circuit of the switching power supply to be conducted; and when the voltage value of the sampling voltage input end is greater than the preset threshold value, the MOS tube is controlled to be disconnected by the output turn-off voltage of the control voltage output end, so that the output circuit of the switching power supply is disconnected. As shown in fig. 1 and fig. 2, the patent controls the on and off of the MOS transistor by sampling the input voltage and determining the difference between the input voltage and the set threshold. When the sampling voltage is less than or equal to a preset threshold value, controlling the conduction of the MOS tube; and when the sampling voltage is greater than the preset threshold value, controlling the MOS tube to be disconnected. For the above scheme, although a method for judging turn-on and turn-off of the MOS transistor by sampling the voltage is proposed, a scheme for how to make the voltage reach a turn-on condition is not proposed.
Patent CN204496425U proposes a slow start circuit device for a computer, which includes a power input interface, a power resistor, an over-current detection circuit, an over-voltage detection circuit, an NMOS transistor, an over-temperature detection circuit for the NMOS transistor, and a boost power chip; the three circuits are connected with the boosting power supply chip to jointly control the enabling transistor of the boosting power supply chip, the output end of the boosting power supply chip is connected with the grid electrode of the NMOS tube, and the switching of the NMOS tube is controlled through whether the boosting power supply chip works or not so as to control the power supply input of the post-stage circuit. Through the addition of the overcurrent and overvoltage circuit of the input power supply, the slow rise of the input voltage and the input current is ensured, the slow start post-stage circuit can be effectively protected under the abnormal condition, and meanwhile, the slow start circuit can be effectively protected from being burnt down due to the increase of the overtemperature circuit.
Patent CN104578742B proposes a slow start circuit, comprising: the power supply comprises a first power supply, a second power supply, a capacitor connected to the first power supply, and a switching transistor connected with the capacitor in series, wherein the grid electrode of the switching transistor is connected to the first input end of the second power supply; the first control module is used for controlling the switching transistor to work in a linear region when the source-drain voltage VDS of the switching transistor is larger than a preset threshold value. When the VDS of the switching transistor VT1 is greater than a preset threshold, the slow start circuit controls the switching transistor VT1 to operate in a linear region through the first control module, so that the switching transistor VT1 equivalently becomes an impedance to suppress an impulse current.
Although there are many schemes for designing a slow start circuit by using MOS transistors in the prior art, no solution is given for overload or short circuit of a load, and no specific process for turning on the slow start circuit is given.
Therefore, it is necessary to provide a solution to the problems of the prior art.
Disclosure of Invention
The invention aims to provide a slow start circuit control method and a slow start circuit control device, which are used for solving the problem that overload or short circuit of a load is not considered in the prior art.
In order to solve the above technical problem, a first aspect of the present invention provides a slow start circuit control method for a switching power supply circuit, including a slow start circuit, the slow start circuit control method including:
s1: judging whether the load connected with the slow starting circuit is in a heavy load or short circuit state, if so, turning off the slow starting circuit, and if not, entering S2;
s2: and carrying out closed-loop chopping on the slow starting circuit, and conducting the slow starting circuit.
Optionally, the slow start circuit includes a transistor, a filter, a diode, and a capacitor;
the capacitor is used for storing energy;
one end of the transistor is connected with the cathode of the diode, the other end of the transistor is connected with the output end of the switching power supply, and the anode of the diode is grounded;
One end of the filter device is connected between the transistor and the diode, the other end of the filter device is connected with one end of the capacitor, the other end of the capacitor is connected with the anode of the diode, and two ends of the capacitor are further connected with a load.
Optionally, the S1 includes:
s11: carrying out chopping processing on the slow starting circuit by using a constant duty ratio, and charging the capacitor;
s12: setting a first time threshold T1 and a first voltage threshold U1, and acquiring the voltage of the capacitor;
s13: judging whether the voltage of the capacitor is smaller than U1 within the time of T1, if so, entering S14, and if not, entering S2;
s14: and the load connected with the slow starting circuit is in a heavy load or short circuit state, and the slow starting circuit is switched off.
Optionally, in S11: the constant duty cycle range is [0.1, 0.2 ].
Optionally, the slow start circuit further includes a detection circuit, and in S12: and acquiring the voltage of the capacitor through the detection circuit.
Optionally, the S2 includes:
s21: setting a second time threshold T2 and a second voltage threshold U2 to obtain the voltage of the capacitor;
s22: if the voltage of the capacitor is greater than or equal to U2 within the time T2, entering S23;
S23: and turning on the transistor to enable the slow starting circuit to be turned on.
Optionally, the 22 further comprises: and if the voltage of the capacitor is less than U2 within the time T2, determining that the capacitor is too large.
Optionally, the filter device includes an inductor.
Optionally, the transistor includes a MOS transistor, a triode, a thyristor, or an IGBT.
A second aspect of the present invention provides a soft start apparatus, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the soft start circuit control method described in any of the above features when executing the computer program.
The invention provides a method and a device for controlling a slow start circuit, which are different from the prior art in that overload or short circuit of a load is considered. When the slow starting circuit is connected with the switching power supply, whether a load connected with the slow starting circuit is in a heavy load or short circuit state or not is judged firstly, if the load connected with the slow starting circuit is in the heavy load or short circuit state, the slow starting circuit is immediately turned off, and a path between the switching power supply and the load is cut off so as to protect electronic devices in the circuit. And if the load connected with the slow starting circuit is not in a heavy load or short circuit state, carrying out closed-loop chopping control on the slow starting circuit to realize the slow starting of the switching power supply circuit.
In the process of judging whether the load connected with the slow starting circuit is in a heavy load or short circuit state, constant small duty ratio is used for chopping control, and the constant small duty ratio can be used for slowly charging the internal capacitor so as to avoid the condition that the diode bears larger follow current when the load is heavy or short circuit occurs. And the process of judging whether the load connected with the slow starting circuit is in a heavy load or short circuit state is given, the voltage of the capacitor is obtained by setting a first time threshold T1 and a first voltage threshold U1, if the voltage of the capacitor is less than U1 within the TI time, the load connected with the slow starting circuit is in the heavy load or short circuit state, and if the voltage of the capacitor is more than or equal to U1, the load connected with the slow starting circuit is in the normal state. The judgment mode only needs to rely on one detection circuit to detect the voltage of the capacitor, the dependence degree on hardware is low, software calculation is needed, the hardware cost is low, and the corresponding method is simple.
In addition, if the energy storage capacitor in the slow start circuit is too large, the time of the whole slow start process is too long, so that the start efficiency of the switching power supply circuit is very low, and if the capacitor is not charged yet, the slow start circuit is already conducted, so that an overlarge current can damage devices in the circuit. Therefore, the size of the capacitance needs to match the soft start circuit. The invention provides a scheme for judging whether the sizes of the capacitors are matched, the voltage of the capacitors is obtained by setting a second time threshold T2 and a second voltage threshold U2, and the capacitors are judged to be overlarge if the voltage of the capacitors does not reach U2 within the time T2. The scheme for judging whether the capacitance is matched or not has low hardware cost and is simple and reliable.
Drawings
Fig. 1 is a schematic diagram of a slow start circuit of a switching power supply provided in the prior art;
fig. 2 is a schematic diagram of a control method of a slow start circuit of a switching power supply provided in the prior art;
fig. 3 is a schematic diagram illustrating a slow start circuit control method according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a slow start circuit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a chopping strategy in a slow start circuit control method according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the step S1 in FIG. 3;
fig. 7 is a schematic diagram of step S2 in fig. 3.
Detailed Description
The following describes in more detail embodiments of the present invention with reference to the schematic drawings. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is provided for the purpose of facilitating and clearly illustrating embodiments of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
As shown in fig. 3 to 7, an embodiment of the present invention provides a slow start circuit control method for a switching power supply circuit, including a slow start circuit, the slow start circuit control method including:
s1: judging whether a load connected with the slow starting circuit is in a heavy load or short circuit state, if so, turning off the slow starting circuit, and if not, entering S2;
s2: and carrying out closed-loop chopping on the slow starting circuit, and conducting the slow starting circuit.
The difference from the prior art is that overload or short circuit conditions are taken into account in the load. When the slow starting circuit is connected with the switching power supply, whether a load connected with the slow starting circuit is in a heavy load or short circuit state or not is judged firstly, if the load connected with the slow starting circuit is in the heavy load or short circuit state, the slow starting circuit is immediately turned off, and a path between the switching power supply and the load is cut off so as to protect electronic devices in the circuit. And if the load connected with the slow starting circuit is not in a heavy load or short circuit state, carrying out closed-loop chopping control on the slow starting circuit to realize the slow starting of the switching power supply circuit. The slow starting circuit control method provided by the embodiment of the invention effectively solves the problem that overload or short circuit of the load is not considered in the prior art.
As shown in fig. 4, an embodiment of the present invention further provides a slow start circuit based on a constant duty cycle chopping strategy, where the slow start circuit includes a transistor, a filter device, a diode, and a capacitor. The capacitor is used for storing energy, one end of the transistor is connected with the negative electrode of the diode, the other end of the transistor is connected with the output end of the switch power supply, and the positive electrode of the diode is grounded. One end of the filter device is connected between the transistor and the diode, the other end of the filter device is connected with one end of the capacitor, the other end of the capacitor is connected with the anode of the diode, and two ends of the capacitor are further connected with a load.
The filter device may be an inductor, but is not limited to an inductor and may be another type of filter device. The transistor can be set as MOS tube or triode or thyristor or IGBT or other type of controllable switch device. In the embodiment of the invention, for convenience of description, the filter device is an inductor, and the transistor is an MOS transistor. As shown in fig. 4, the MOS transistor T is a switching transistor for isolating Vin from V0ut, and L is a filter inductor. By adding the diode D, the diode D, MOS tube T, the filter inductor L and the capacitor C0 form a BUCK circuit, the switch of the MOS tube T is controlled through chopping, the capacitor C0 is charged, and therefore the voltage V0 (namely the voltage of the capacitor) on the inner side of the MOS tube reaches a starting threshold value. The chopping is to change the direct current into another fixed voltage or adjustable voltage direct current. Also known as a DC-DC converter (DC/DC C0 inverter), generally refers to converting DC power directly into another DC power.
Further, as shown in fig. 6, the S1 may specifically include:
s11: carrying out chopping processing on the slow starting circuit by using a constant duty ratio, and charging the capacitor;
s12: setting a first time threshold T1 and a first voltage threshold U1, and acquiring the voltage of the capacitor;
s13: judging whether the voltage of the capacitor is less than U1 within the time T1, if so, entering S14, and if not, entering S2;
s14: and the load connected with the slow starting circuit is in a heavy load or short circuit state, and the slow starting circuit is switched off.
In the process of judging whether the load connected with the slow starting circuit is in a heavy load or short circuit state, constant small duty ratio can be used for chopping control, and the constant small duty ratio can be used for slowly charging the internal capacitor so as to avoid the condition that the diode bears larger follow current when the load is heavy load or short circuit occurs. And the process of judging whether the load connected with the slow starting circuit is in a heavy load or short circuit state is given, the voltage of the capacitor is obtained by setting a first time threshold T1 and a first voltage threshold U1, if the voltage of the capacitor is less than U1 within the TI time, the load connected with the slow starting circuit is in the heavy load or short circuit state, and if the voltage of the capacitor is more than or equal to U1, the load connected with the slow starting circuit is in the normal state. The judgment method can detect the voltage of the capacitor only by relying on one detection circuit, has low dependence degree on hardware, can be calculated by software, has low hardware cost, and has simple corresponding method. It should be noted that the constant duty cycle may be selected with a smaller duty cycle, and the value of the specific duty cycle may be selected to be any value in the range of [0.1, 0.2 ]. For example, the constant duty ratio may be set to 0.1, the value of the constant duty ratio may also be set to 0.2, and many other values may be selected, which is not limited herein and may be specifically selected according to actual needs.
In addition, in the process of judging whether the load connected with the slow starting circuit is in a heavy load or short circuit state, PWM chopping is used for controlling the MOS tube, and PWM signals are used for controlling the slow starting circuit by being connected with the base electrode of the MOS tube.
Optionally, the slow start circuit further includes a detection circuit, and in S12: and acquiring the voltage of the capacitor through the detection circuit.
Further, as shown in fig. 7, the S2 includes:
s21: setting a second time threshold T2 and a second voltage threshold U2 to obtain the voltage of the capacitor;
s22: if the voltage of the capacitor is greater than or equal to U2 within the time T2, entering S23;
s23: and turning on the transistor to enable the slow starting circuit to be turned on.
Optionally, the 22 further comprises: and if the voltage of the capacitor is less than U2 within the time T2, determining that the capacitor is too large.
If the energy storage capacitor in the slow starting circuit is too large, the time of the whole slow starting process is too long, the starting efficiency of the switching power supply circuit is very low, and if the capacitor is not charged yet, the slow starting circuit is conducted, and the device in the circuit is damaged by too large current. Therefore, the size of the capacitor needs to be matched to the soft start circuit. The invention provides a scheme for judging whether the sizes of the capacitors are matched, the voltage of the capacitors is obtained by setting a second time threshold T2 and a second voltage threshold U2, and the capacitors are judged to be overlarge if the voltage of the capacitors does not reach U2 within the time T2. The scheme for judging whether the sizes of the capacitors are matched or not has the advantages of low hardware cost, simplicity and reliability. It should be noted that, in the whole step S2, the PWM chopping control is no longer used, but the closed-loop chopping control is performed by a closed-loop control circuit connected by a MOS transistor. One end of the closed-loop control circuit is connected with a base electrode of the MOS tube, the other end of the closed-loop control circuit is connected with two ends of the load so as to detect the voltage at two ends of the capacitor, a processing device in the closed-loop control circuit receives the voltage value fed back, then the voltage value fed back is compared with a rated voltage value, a control signal is sent out to the MOS tube to form closed-loop control, and the voltage output by the capacitor is ensured to be within a rated range through the closed-loop control circuit. The value of the second voltage threshold U2 should be close to the input voltage Uin of the switching power supply.
The present invention provides a slow start circuit control method, as shown in fig. 5, which actually includes two phases, a first phase period1 and a second phase period 2. period1 is constant duty cycle chopping, and period2 is closed loop chopping. During period1, chopping is performed using a constant small duty cycle, charging the internal capacitor C0. Meanwhile, in order to judge whether the load Z is in a heavy load or short circuit state, chopping time T1 is set, if the time T1 is exceeded and the inner side voltage V0 does not reach U1, the load Z is judged to be in a heavy load or short circuit state, chopping is stopped, and the process is not continued. Otherwise, period2 phase is entered. In period2, the MOS transistor performs closed-loop chopping, so that the internal voltage V0 quickly reaches the threshold value U2. If the threshold value is reached within the time T2, closing the MOS transistor T to realize slow start; if the chopping time exceeds T2, it indicates that the inner capacitance is too large.
A second aspect of the present invention provides a soft start apparatus, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the soft start circuit control method described in any of the above features when executing the computer program.
In summary, the present invention provides a method and an apparatus for controlling a slow start circuit, which are different from the prior art in that overload or short circuit of a load is considered. When the slow starting circuit is connected with the switching power supply, whether a load connected with the slow starting circuit is in a heavy load or short circuit state or not is judged firstly, if the load connected with the slow starting circuit is in the heavy load or short circuit state, the slow starting circuit is immediately turned off, and a path between the switching power supply and the load is cut off so as to protect electronic devices in the circuit. And if the load connected with the slow starting circuit is not in a heavy load or short circuit state, carrying out closed-loop chopping control on the slow starting circuit to realize the slow starting of the switching power supply circuit.
In the process of judging whether the load connected with the slow starting circuit is in a heavy load or short circuit state, constant small duty ratio is used for chopping control, and the constant small duty ratio can be used for slowly charging the internal capacitor so as to avoid the condition that the diode bears larger follow current when the load is heavy or short circuit occurs. And the process of judging whether the load connected with the slow starting circuit is in a heavy load or short circuit state is given, the voltage of the capacitor is acquired by setting a first time threshold T1 and a first voltage threshold U1, and within the TI time, if the voltage of the capacitor is smaller than U1, the load connected with the slow starting circuit is in the heavy load or short circuit state, and if the voltage of the capacitor is larger than or equal to U1, the load connected with the slow starting circuit is in the normal state. The judgment mode only needs to rely on one detection circuit to detect the voltage of the capacitor, the dependence degree on hardware is low, software calculation is needed, the hardware cost is low, and the corresponding method is simple.
In addition, if the energy storage capacitor in the slow start circuit is too large, the whole slow start process is too long, so that the start efficiency of the switching power supply circuit is very low, and if the capacitor is not charged yet, the slow start circuit is turned on, so that too large current damages devices in the circuit. Therefore, the size of the capacitance needs to match the soft start circuit. The invention provides a scheme for judging whether the sizes of the capacitors are matched, the voltage of the capacitors is obtained by setting a second time threshold T2 and a second voltage threshold U2, and the capacitors are judged to be overlarge if the voltage of the capacitors does not reach U2 within the time T2. The scheme for judging whether the capacitance is matched or not has low hardware cost and is simple and reliable.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example" or "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. And the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A slow starting circuit control method is used for a switch power supply circuit and is characterized in that the switch power supply circuit comprises a slow starting circuit, and the slow starting circuit comprises a transistor, a filter device, a diode and a capacitor;
The capacitor is used for storing energy;
one end of the transistor is connected with the cathode of the diode, the other end of the transistor is connected with the output end of the switching power supply, and the anode of the diode is grounded;
one end of the filter device is connected between the transistor and the diode, the other end of the filter device is connected with one end of the capacitor, the other end of the capacitor is connected with the anode of the diode, and two ends of the capacitor are also connected with a load;
the slow starting circuit control method comprises the following steps:
s1: judging whether a load connected with the slow starting circuit is in a heavy load or short circuit state, if so, turning off the slow starting circuit, and if not, entering S2;
s2: carrying out closed-loop chopping on the slow starting circuit, and conducting the slow starting circuit;
the S1 includes:
s11: carrying out chopping processing on the slow starting circuit by using a constant duty ratio, and charging the capacitor;
s12: setting a first time threshold T1 and a first voltage threshold U1, and acquiring the voltage of the capacitor;
s13: judging whether the voltage of the capacitor is less than U1 within the time T1, if so, entering S14, and if not, entering S2;
s14: and the load connected with the slow starting circuit is in a heavy load or short circuit state, and the slow starting circuit is switched off.
2. The method as claimed in claim 1, wherein in S11: the constant duty cycle range is [0.1, 0.2 ].
3. The slow start circuit controlling method of claim 1, wherein said slow start circuit further comprises a detecting circuit, and in said S12: and acquiring the voltage of the capacitor through the detection circuit.
4. The slow start circuit control method according to claim 1, wherein said S2 includes:
s21: setting a second time threshold T2 and a second voltage threshold U2 to obtain the voltage of the capacitor;
s22: if the voltage of the capacitor is greater than or equal to U2 within the time T2, entering S23;
s23: and turning on the transistor to enable the slow starting circuit to be turned on.
5. The slow start circuit control method according to claim 4, wherein said S22 further comprises: and if the voltage of the capacitor is less than U2 within the time T2, determining that the capacitor is too large.
6. A soft start circuit control method as claimed in claim 1, wherein said filter device comprises an inductor.
7. A soft start circuit control method as claimed in claim 1, wherein said transistor comprises a MOS transistor or a triode or a thyristor or an IGBT.
8. A slow start apparatus comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the slow start circuit control method according to any one of claims 1 to 7 when executing the computer program.
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| CN108616209A (en) * | 2018-04-17 | 2018-10-02 | 华南理工大学 | A kind of dynamic regulating method of digital power largest duty cycle value |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9972998B2 (en) * | 2015-06-08 | 2018-05-15 | Dialog Semiconductor (Uk) Limited | Short circuit self-protected DC-to-DC buck converters |
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|---|---|---|---|---|
| JP2004056874A (en) * | 2002-07-17 | 2004-02-19 | Nichicon Corp | Step-down chopper regulator circuit |
| CN101631410A (en) * | 2009-08-24 | 2010-01-20 | 英飞特电子（杭州）有限公司 | AC-DC LED drive circuit with high power factor |
| CN103713255A (en) * | 2013-12-12 | 2014-04-09 | 华为技术有限公司 | Circuit fault detection method, circuit fault detection system and controller |
| CN108616209A (en) * | 2018-04-17 | 2018-10-02 | 华南理工大学 | A kind of dynamic regulating method of digital power largest duty cycle value |
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