CN112104217B - Power supply soft start control method and device - Google Patents
Power supply soft start control method and device Download PDFInfo
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- CN112104217B CN112104217B CN202010885333.2A CN202010885333A CN112104217B CN 112104217 B CN112104217 B CN 112104217B CN 202010885333 A CN202010885333 A CN 202010885333A CN 112104217 B CN112104217 B CN 112104217B
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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
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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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Abstract
A power supply soft start control method and a device are provided, wherein a power supply supplies power to a load through an electronic switch, the power supply soft start control method controls the electronic switch to be continuously switched on and off for a target number of times and then to be kept switched on when the peak value of overshoot voltage output by the power supply is larger than or equal to the safe working voltage of the load, so that the average current drawn by the load from the power supply is gradually increased, the average voltage of the load is gradually increased from 0 to a rated voltage, the phenomenon that the output voltage of the power supply is overshot and the load is damaged due to the fact that the load draws large current from the power supply once is avoided, and the problem that devices in the load fail due to the fact that the overshoot voltage is large in a traditional power supply mode is solved.
Description
Technical Field
The application belongs to the technical field of soft start control, and particularly relates to a power supply soft start control method and device.
Background
At present, the conventional load power supply mode generally adopts a one-time connection mode, namely, a power supply path between a power supply and a load is closed at one time, however, if the power supply comprises a voltage conversion circuit, the one-time connection mode can cause the output voltage of a DC/DC conversion circuit to overshoot, and when the peak value of the overshoot voltage exceeds the maximum operating voltage of a device in the load, the device is caused to fail.
Therefore, the conventional power supply mode has the problem that the overshoot voltage is large, so that devices in the load are failed.
Disclosure of Invention
The application aims to provide a power supply soft start control method and device, and aims to solve the problem that devices in a load are invalid due to the fact that overshoot voltage is large in a traditional power supply mode.
A first aspect of an embodiment of the present application provides a power supply soft start control method, where a power supply supplies power to a load through an electronic switch, and the power supply soft start control method includes:
collecting a peak value of overshoot voltage output by the power supply;
determining a safe operating voltage of the load;
comparing the peak value of the overshoot voltage with the safe working voltage;
when the peak value of the overshoot voltage is greater than or equal to the safe working voltage, the electronic switch is controlled to be continuously switched on and switched off for a target number of times and then kept switched on;
and when the peak value of the overshoot voltage is smaller than the safe working voltage, controlling the electronic switch to be conducted for one time.
Further, the power supply soft start control method further includes: the single-time on duration of the electronic switch is equal, and the single-time off duration of the electronic switch is equal.
Further, the power supply soft start control method further includes: the single turn-off duration is greater than or equal to the single turn-on duration.
Further, the power supply soft start control method further includes: the target number of times is 5 or more.
Further, the step of controlling the electronic switch to be continuously turned on and off for the target number of times and then to be kept on specifically includes:
determining a preset time length according to the pulse width of the overshoot voltage;
acquiring a minimum time interval for controlling the continuous on and off of the electronic switch;
determining the single on-off duration of the electronic switch according to the minimum time interval;
determining the target times according to the ratio of the preset time length to the single on-off time length;
and controlling the electronic switch to be switched on and off for a target number of times within the preset time length, and controlling the electronic switch to be kept switched on after the preset time length.
Further, the step of controlling the electronic switch to be continuously turned on and off for the target number of times and then to be kept on specifically includes:
acquiring a preset value of the output voltage of the power supply;
the peak value of the overshoot voltage is subtracted from the preset value to obtain a first voltage difference value;
the safe working voltage is subtracted from the preset value to obtain a second voltage difference value;
determining the target times according to the first voltage difference value and the second voltage difference value;
and controlling the electronic switch to be continuously switched on and switched off for the target times and then keeping on.
A second aspect of the embodiments of the present application provides a power supply soft start control device, in which a power supply supplies power to a load through an electronic switch, the power supply soft start control device includes:
the acquisition module is used for acquiring the peak value of the overshoot voltage output by the power supply;
the acquisition module is used for determining the safe working voltage of the load;
the comparison module is used for comparing the peak value of the overshoot voltage with the safe working voltage; and
and the control module is used for controlling the electronic switch to be continuously switched on and switched off for a target number of times and then to be kept switched on when the peak value of the overshoot voltage is greater than or equal to the safe working voltage, and controlling the electronic switch to be switched on once when the peak value of the overshoot voltage is smaller than the safe working voltage.
Further, the control module includes: a first calculation unit, an acquisition unit, a second calculation unit 243, a third calculation unit, and a first control unit.
The first calculating unit is used for determining a preset time length by the pulse width of the overshoot voltage; the acquisition unit is used for acquiring the minimum time interval for controlling the continuous on and off of the electronic switch; the second calculating unit is used for determining the single on-off duration of the electronic switch according to the minimum time interval; the third calculating unit is used for determining the target times according to the ratio of the preset time length to the single on-off time length; the first control unit is used for controlling the electronic switch to be switched on and off for a target number of times within a preset time length and controlling the electronic switch to be kept switched on after the preset time length.
Further, the control module includes: the device comprises an acquisition unit, a first subtracter, a second subtracter, a fourth calculation unit and a second control unit.
The acquisition unit is used for acquiring a preset value of the output voltage of the power supply; the first subtractor is used for subtracting the peak value of the overshoot voltage from a preset value to obtain a first voltage difference value; the second subtracter is used for subtracting the safe working voltage from a preset value to obtain a second voltage difference value; the fourth calculating unit is used for determining the target times according to the first voltage difference value and the second voltage difference value; the second control unit is used for controlling the electronic switch to be continuously switched on and switched off for a target number of times and then to be kept switched on.
The power supply soft start control device controls the electronic switch to be continuously switched on and switched off for the target times and then to be kept switched on when the peak value of the overshoot voltage output by the power supply is greater than or equal to the safe working voltage of the load, so that the average current drawn by the load from the power supply is gradually increased, the average voltage of the load is gradually increased from 0 to the rated voltage, the overshoot of the output voltage of the power supply caused by the fact that the load draws a large current from the power supply once is avoided, the condition that the load is damaged is avoided, and the problem that the overshoot voltage is large and devices in the load are invalid in the traditional power supply mode is solved.
A third aspect of an embodiment of the present application provides a power supply soft-start control device, including:
an electronic switch connected in series between a power source and a load; and
and the control circuit is connected with the control end of the electronic switch and is used for controlling the electronic switch to be continuously switched on and switched off for a target number of times and then to be kept switched on so as to realize soft start of the load.
A fourth aspect of embodiments of the present application provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the method when executing the computer program.
A fifth aspect of embodiments of the present application provides a computer-readable storage medium, which stores a computer program, which, when executed by a processor, implements the steps of the method as described above.
According to the power supply soft start control method, when the peak value of the overshoot voltage output by the power supply is larger than or equal to the safe working voltage of the load, the electronic switch is controlled to be continuously switched on and off for the target times and then kept on, so that the average current drawn by the load from the power supply is gradually increased, the average voltage of the load is gradually increased from 0 to the rated voltage, the overshoot of the output voltage of the power supply caused by the fact that the load draws large current from the power supply once is avoided, the situation that the load is damaged is avoided, and the problem that devices in the load are invalid due to the fact that the overshoot voltage is large in the traditional power supply mode is solved.
Drawings
Fig. 1 is a detailed flowchart of a power soft start control method according to a first embodiment of the present application;
fig. 2 is a detailed flowchart of a power soft start control method according to a second embodiment of the present application;
fig. 3 is a detailed flowchart of a power soft start control method according to a third embodiment of the present application;
FIG. 4-a is a graph of the voltage waveform of the output voltage of a power supply in a conventional power mode;
FIG. 4-b is a voltage waveform diagram of the output voltage of the power supply under the control of the power supply soft start control method of the present application;
fig. 5 is a schematic circuit diagram of a power supply soft start control device according to an embodiment of the present application;
fig. 6 is a circuit schematic diagram of another power soft start control apparatus according to an embodiment of the present application;
FIG. 7 is a detailed circuit diagram of a control module of the power soft start control apparatus shown in FIG. 6;
FIG. 8 is a schematic diagram of another specific circuit of a control module of the power soft start control apparatus shown in FIG. 6;
fig. 9 is a schematic diagram of a control device according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
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 application, "a plurality" means two or more unless specifically limited otherwise.
It should be understood that the control main body of the power supply soft start control method can be a microprocessor such as a single chip microcomputer and a logic controller, and can also be an intelligent terminal such as a desktop computer and a notebook computer. Namely, the method is executed by a control main body such as a microprocessor or an intelligent terminal, and the soft start of the load is realized.
Fig. 1 shows a specific flowchart of a power soft start control method provided in a first embodiment of the present application, and for convenience of description, only the parts related to this embodiment are shown, and detailed descriptions are as follows:
step S101: collecting the peak value of overshoot voltage output by a power supply;
it should be understood that the overshoot voltage in this embodiment is an overshoot value of the power source and the load in a one-time turn-on mode. The overshoot voltage of the power supply output is the top pulse in the output voltage of the power supply. The system can form continuous voltage waveform on a time axis according to the output voltage, and determine the overshoot voltage of the power supply, specifically including the peak value, the pulse width and the like of the overshoot voltage. The voltage signal sampling circuit may be composed of a sampling resistor, a voltage sensor, an oscilloscope, or the like. Optionally, the system may also call the historical average overshoot voltage of the power supply as the current overshoot voltage by reading the pre-stored information.
Step S102: determining a safe operating voltage of a load;
it should be understood that the safe operating voltage of the load is the highest operating voltage of the load minus a certain margin value, the highest operating voltage is the lowest value of the highest sustainable voltages of the devices in the load, and the highest sustainable voltage is the critical value for whether a device fails or not, i.e., the device fails when the highest sustainable voltage is exceeded.
Optionally, the safe operating voltage of the load may be determined by reading pre-stored data in a database, or may be determined by manual input.
Step S103: comparing the peak value of the overshoot voltage with the safe working voltage;
it should be understood that the peak value of the overshoot voltage and the safe operating voltage can be compared by a voltage comparator, and the magnitudes of the two can also be compared by directly making a difference, a quotient and the like.
Step S104: when the peak value of the overshoot voltage is greater than or equal to the safe working voltage, the electronic switch is controlled to be continuously switched on and switched off for a target number of times and then kept switched on;
it will be appreciated that when the peak value of the overshoot voltage is greater than or equal to the safe operating voltage, which is characteristic of the power supply being in a one-time on mode, the overshoot voltage output to the load may cause certain devices of the load to fail.
It is understood that the target number is two or more. The duration of the target times of continuous on and off of the electronic switch is within a preset duration, and the preset duration can be set independently and is generally the shortest duration which can be realized. The on-off of the electronic switch can be controlled by outputting a preset pulse width modulation signal, so that the electronic switch is turned on and off for multiple times in a short time, the peak value of the overshoot voltage is reduced, and the overvoltage influence on the load is avoided.
Step S105: and when the peak value of the overshoot voltage is smaller than the safe working voltage, controlling the electronic switch to be conducted once.
It should be appreciated that the overshoot voltage output by the power supply in the one-time-on mode also does not cause load failure when the peak value of the overshoot voltage is less than the safe operating voltage. Optionally, when the peak value of the overshoot voltage is smaller than the safe operating voltage, the electronic switch may be controlled to remain on after being turned on for multiple times. Optionally, when the peak value of the overshoot voltage is smaller than the safe working voltage, an alarm signal or related information may be sent to the mobile terminal to notify the user to cancel the soft start control of the load, so that the load maintains the original start mode, thereby reducing resource waste.
In the power supply soft start control method in the embodiment, the electronic switch is connected in series between the power supply and the load, and when the peak value of the overshoot voltage output by the power supply is greater than or equal to the safe working voltage of the load, the electronic switch is controlled to be continuously connected and disconnected for the target times and then kept connected, so that the average current drawn by the load from the power supply gradually rises, the average voltage of the load is gradually increased from 0 to the rated voltage, the phenomenon that the output voltage of the power supply overshoots and the load is damaged due to the fact that the load draws a large current from the power supply at one time is avoided, and the problem that devices in the load fail due to the fact that the overshoot voltage is large in the traditional power supply mode is solved.
In addition, before the start control of the electronic switch is realized, the power supply soft start control method in this embodiment also judges whether the load needs to be subjected to soft start control by collecting and comparing the equivalent of the overshoot voltage and the magnitude of the safe working voltage, so that the diversity and the practicability of the start mode of the load are increased, and when the load can be once conducted and the element failure cannot be caused, the load is kept to be once conducted. When the peak value of the output overshoot voltage of the power supply is large, so that part of elements of the load can be failed, the electronic switch is controlled to be continuously switched on and off for a target number of times within a preset time period and then is kept switched on to realize the soft start of the load, so that the load is protected from the influence of the overshoot voltage.
Further, in one embodiment, the single on time periods of the electronic switches are equal, and the single off time periods of the electronic switches are equal.
It should be understood that the lowest value of the single on-time period may be set as the minimum achievable time interval of the control body, i.e. the minimum clock period of the control body, for example, when the minimum clock period of the control body is 100us, then the single on-time period of the single-sub switch may be set to 100 us.
Alternatively, in other embodiments, the conducting time lengths of the electronic switches may not be consistent, and may be sequentially increased according to a preset ratio, for example. Likewise, the turn-off durations of the electronic switches may not be consistent, and may be decreased in sequence according to the preset proportion. The single on-off time of each electronic switch is the same.
Further, in one embodiment, the single off duration of the electronic switch is greater than or equal to the single on duration.
It should be understood that the single off duration and the single on duration in the present embodiment are compared in the same order, for example, the first off duration and the first on duration are compared, and the second off duration and the second on duration are compared.
Optionally, the total off duration of the electronic switch is equal to or greater than the total on duration. The total turn-off duration is the sum of the total turn-off durations of the single turns, and the total turn-on duration is the sum of the total turn-on durations of the single turns.
Further, in one embodiment, the target number of times is 5 or more, for example, the target number of times may be 7. It should be appreciated that in other embodiments, the target number of times may be set to other values.
Fig. 2 shows a specific flowchart of a power soft start control method provided in a second embodiment of the present application, and for convenience of description, only the parts related to this embodiment are shown, and detailed descriptions are as follows:
step S201: collecting the peak value of overshoot voltage output by a power supply;
step S202: determining a safe operating voltage of a load;
step S203: comparing the peak value of the overshoot voltage with the safe working voltage;
step S204: and when the peak value of the overshoot voltage is smaller than the safe working voltage, controlling the electronic switch to be conducted once.
It should be understood that steps S201 to S203 in this embodiment are the same as steps S101 to S103 in the previous embodiment, and step S204 in this embodiment is the same as step S105 in the previous embodiment, which is not repeated herein.
Step S205: when the peak value of the overshoot voltage is greater than or equal to the safe working voltage, the pulse width of the overshoot voltage is used for determining the preset time length.
It should be understood that the pulse width of the overshoot voltage of the power supply can be obtained by collecting, for example, by a voltage signal sampling circuit, the output voltage of the power supply is collected, and the processor determines the pulse width of the overshoot voltage output by the power supply according to the voltage waveform formed by the output voltage in the time region. The voltage signal sampling circuit may be composed of a sampling resistor, a voltage sensor, an oscilloscope, or the like. Optionally, the average pulse width of the historical overshoot voltage of the power supply may be called as the current pulse width by reading the pre-stored information in the database. Optionally, the pulse width may be obtained through an input panel or through communication with an upper computer, where the obtaining through the input panel is a manual obtaining mode, and the obtaining through communication with the upper computer is an automatic obtaining mode, where the upper computer may be a mobile terminal such as a mobile phone, a tablet, or a computer, and the upper computer may also be a cloud server.
It should be understood that the preset duration is determined according to the value of the pulse width, specifically, the preset duration is obtained by adding or subtracting a certain margin value to the value of the pulse width, and the preset duration is approximately equal to the pulse width of the overshoot voltage.
Step S206: acquiring a minimum time interval for controlling the continuous on and off of the electronic switch;
it will be understood that the minimum time interval for the control electronic switch to be continuously switched on and off is determined by the minimum clock period according to the control body, i.e. the minimum time interval can be obtained by reading or acquiring the clock oscillation period of the control body itself.
Step S207: determining the single on-off duration of the electronic switch according to the minimum time interval;
it should be understood that the single on-off duration is the sum of the single on duration and the single off duration, and the single on-off duration should be greater than or equal to twice the minimum time interval.
Step S208: determining the target times according to the ratio of the preset time length to the single on-off time length;
it should be understood that in other embodiments, the single on-off duration of the electronic switch may also be determined according to the minimum clock period of the control body, and the preset duration may be determined according to the multiplication value of the single on-off duration and the target number, wherein the single on-off duration is equal to or approximately equal to twice the minimum clock period.
Step S209: and controlling the electronic switch to be switched on and off for the target times within the preset time length, and controlling the electronic switch to be kept on after the preset time length.
In the soft start control method for the power supply in the embodiment, the overshoot voltage is maximally decomposed within the same time duration by setting the preset time duration and the single on-off time duration, so that the output voltage of the power supply is stabilized on the preset value as much as possible, and the soft start of the power supply is realized under the condition that the normal power-on time duration of the power supply is not increased.
Fig. 3 shows a specific flowchart of a power soft-start control method according to a third embodiment of the present application, and for convenience of description, only the parts related to this embodiment are shown, and detailed descriptions are as follows:
step S301: collecting the peak value of overshoot voltage output by a power supply;
step S302: determining a safe operating voltage of a load;
step S303: comparing the peak value of the overshoot voltage with the safe working voltage;
step S304: and when the peak value of the overshoot voltage is smaller than the safe working voltage, controlling the electronic switch to be conducted once.
It should be understood that steps S301 to S303 in this embodiment are the same as steps S101 to S103 in the previous embodiment, and step S304 in this embodiment is the same as step S305 in the previous embodiment, which is not repeated herein.
Step S305: when the peak value of the overshoot voltage is greater than or equal to the safe working voltage, acquiring a preset value of the output voltage of the power supply;
it will be appreciated that the preset value of the output voltage of the power supply is the nominal output voltage of the power supply. The output voltage of the power supply can be collected through the voltage signal sampling circuit, and the control main body determines the preset value of the output voltage of the power supply according to the voltage waveform formed by the output voltage in the time region. The voltage signal sampling circuit may be composed of a sampling resistor, a voltage sensor, an oscilloscope, or the like. Optionally, the preset value of the output voltage of the power supply can be called by reading the pre-stored information of the database; the value may also be obtained through the input panel.
Step S306: the peak value of the overshoot voltage is subtracted from a preset value to obtain a first voltage difference value;
it should be understood that the peak value of the overshoot voltage and the preset value can be respectively output to two input terminals of the subtractor to obtain the first voltage difference value. The peak value and the preset value of the overshoot voltage can be converted into digital signals respectively, and then a first voltage difference value is obtained through program operation. The first voltage difference is taken as an absolute value.
Step S307: the safe working voltage is subtracted from a preset value to obtain a second voltage difference value;
it should be understood that the safe operating voltage and the preset value can be respectively output to two input terminals of the subtractor to obtain the second voltage difference. The safe working voltage and the preset value can be converted into digital signals respectively, and then a second voltage difference value is obtained through program operation. The second voltage difference is taken as an absolute value.
Step S308: and determining the target times according to the ratio of the first voltage difference value to the second voltage.
It should be understood that the ratio of the first voltage difference value to the second voltage takes an integer value as the target number, and when the ratio of the first voltage difference value to the second voltage has a decimal number, an integer number +1 is taken as the target number, for example, when the ratio of the first voltage difference value to the second voltage is 6.1, the target number is 7.
Step S309: controlling the electronic switch to be continuously switched on and switched off for a target number of times and then keeping on;
it is to be understood that step S309 coincides with step S104 in the first embodiment. The single on time and the single off time of the electronic switch can refer to the minimum time period of the control main body, so that the continuous target times of on and off of the electronic switch can be completed in the shortest time period.
In the power supply soft start control method in the embodiment, the first voltage difference value is obtained by subtracting the peak value of the overshoot voltage from the preset value, the second voltage difference value is obtained by subtracting the safe working voltage from the preset value, and the target frequency is determined according to the ratio of the first voltage difference value to the second voltage, so that the minimum on-off frequency of the electronic switch is obtained, that is, the output voltage of the power supply can not cause the device failure of the load under the minimum on-off frequency, that is, the soft start of the load is realized under the minimum continuous on-off control of the electronic switch, thereby not only avoiding the device failure of the load, but also reducing the frequent on-off of the electronic switch.
Referring to fig. 4-a and 4-b, fig. 4-a is a voltage waveform diagram of the power output in a one-time turn-on mode. Fig. 4-b is a voltage waveform diagram of power output under the control of the power soft start control method, wherein the preset value of the output voltage of the power is 5V, the overshoot voltage output by the power is 7V, the electronic switch is kept on after being switched on and off for 7 times, and the single on time and the single off time are both 100us respectively. The comparison of the two graphs shows that the voltage of the power output voltage waveform under the power soft start control method is stable, no obvious tip pulse exists, namely, no obvious overshoot voltage exists, and the influences of failure and the like on the load can be avoided.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
Referring to fig. 5, an embodiment of the present application provides a power soft-start control device 300 connected between a power source 100 and a load 200, where the power soft-start control device 300 includes: an electronic switch 310 and a control circuit 320, the electronic switch 310 being connected in series between the power source 100 and the load 200; the control circuit 320 is connected with the control end of the electronic switch 310; the control circuit 320 is used to control the electronic switch 310 to be turned on continuously and turned off for a target number of times and then to be turned on continuously, so as to enable the load 200 to realize soft start.
It should be understood that the power soft-start control device 300 in the present embodiment is used for executing the above-mentioned power soft-start control method.
The power supply 100 includes a voltage conversion circuit, which may be formed of a voltage conversion chip. The electronic switch 310 may be a controllable switch such as a switch tube. The control circuit 320 may be formed of a microprocessor such as a single chip microcomputer.
Further, in one embodiment, the minimum time period of the control circuit 320 is the minimum single on duration of the electronic switch 310.
Further, in one embodiment, the single on time periods of the electronic switches 310 are equal, and the single off time periods of the electronic switches 310 are equal.
Further, in one embodiment, the single off duration of the electronic switch 310 is greater than or equal to the single on duration.
Further, in one embodiment, the target number of times is 5 or more, for example, the target number of times may be 7.
Further, the voltage overshoot detection circuit further comprises a sampling circuit, the sampling circuit is connected with the output end of the power supply 100 and the control circuit 320, and the sampling circuit is used for collecting the peak value and the preset value of the overshoot voltage output by the power supply 100 and outputting the peak value and the preset value to the control circuit 320.
It should be understood that the sampling circuit may be constituted by a sampling resistor, a voltage sensor, an oscilloscope, or the like. The sampling circuit may be integrated in the same chip as the control circuit 320.
The power supply soft start control device 300 in this embodiment, by using the control circuit 320, maintains the conduction after the electronic switch 310 connected in series between the power supply 100 and the load 200 is turned on and off for many times, thereby realizing the soft start of the load 200 and avoiding the problem that some devices of the load 200 are failed due to the overshoot voltage appearing at the initial stage of power supply.
Referring to fig. 6, an embodiment of the present application provides a power soft-start control device 20, connected to an electronic switch 12, where a power source 11 supplies power to a load 13 through the electronic switch 12, and the power soft-start control device 20 includes: an acquisition module 21, an acquisition module 22, a comparison module 23 and a control module 24.
The acquisition module 21 is configured to acquire a peak value of the overshoot voltage output by the power supply 11; the obtaining module 22 is used for determining the safe working voltage of the load 13; the comparison module 23 is used for comparing the peak value of the overshoot voltage with the magnitude of the safe working voltage; the control module 24 is configured to control the electronic switch 12 to be turned on after the overshoot voltage is greater than or equal to the safe operating voltage for the target number of consecutive turn-on and turn-off times, and to control the electronic switch 12 to be turned on once when the overshoot voltage is less than the safe operating voltage.
It should be understood that the power soft-start control device 20 is used for executing the steps of the power soft-start control method in the above embodiments, and the detailed description thereof is omitted here.
In one embodiment, referring to fig. 7, the control module 24 includes: a first calculation unit 241, an acquisition unit 242, a second calculation unit 243, a third calculation unit 244, and a first control unit 245.
The first calculating unit 241 is configured to determine a preset time duration by a pulse width of the overshoot voltage; the obtaining unit 242 is configured to obtain a minimum time interval for controlling the electronic switch 12 to be continuously turned on and off; the second calculating unit 243 is configured to determine a single on-off duration of the electronic switch 12 according to the minimum time interval; the third calculating unit 244 is configured to determine the target times according to a ratio of the preset time length to the single on-off time length; the first control unit 245 is configured to control the electronic switch 12 to turn on or off for a target number of times within a preset time period, and control the electronic switch 12 to remain on after the preset time period.
It should be understood that the first calculating unit 241 is configured to perform step S205 of the above-mentioned method embodiment, the obtaining unit 242 is configured to perform step S206 of the above-mentioned method embodiment, the second calculating unit 243 is configured to perform step S207 of the above-mentioned method embodiment, the third calculating unit 244 is configured to perform step S208 of the above-mentioned method embodiment, and the first control unit 245 is configured to perform step S209 of the above-mentioned method embodiment, which is not described herein again.
In one embodiment, referring to fig. 8, the control module 24 includes: an acquisition unit 246, a first subtractor 247, a second subtractor 248, a fourth calculation unit 249, and a second control unit 240.
The acquisition unit 246 is used for acquiring the preset value of the output voltage of the power supply; the first subtractor 247 is configured to subtract the peak value of the overshoot voltage from a preset value to obtain a first voltage difference value; the second subtractor 248 is configured to subtract the safe operating voltage from a preset value to obtain a second voltage difference value; the fourth calculating unit 249 is configured to determine the target number of times according to the first voltage difference value and the second voltage difference value; the second control unit 240 is used for controlling the electronic switch 12 to be continuously turned on and off for a target number of times and then to be kept on.
It should be understood that the acquisition unit 246 is configured to perform step S305 of the above-mentioned method embodiment, the first subtractor 247 is configured to perform step S306 of the above-mentioned method embodiment, the second subtractor 248 is configured to perform step S307 of the above-mentioned method embodiment, the fourth calculation unit 249 is configured to perform step S308 of the above-mentioned method embodiment, and the second control unit 240 is configured to perform step S309 of the above-mentioned method embodiment, which is not described herein again.
According to the power supply soft start control device 20, when the peak value of the overshoot voltage output by the power supply 11 is greater than or equal to the safe working voltage of the load 13, the electronic switch 12 is controlled to be continuously switched on and off for the target times and then kept on, so that the average current drawn by the load 13 from the power supply 11 gradually rises, the average voltage of the load 13 gradually rises from 0 to the rated voltage, the overshoot of the output voltage of the power supply 11 caused by the fact that the load 13 draws a large current from the power supply 11 once is avoided, the situation that the load 13 is damaged is avoided, and the problem that the overshoot voltage is large and devices in the load 13 are failed in the traditional power supply mode is solved.
Fig. 9 is a schematic diagram of a control device according to an embodiment of the present application. As shown in fig. 6, the electronic apparatus 6 of this embodiment includes: a processor 60, a memory 61 and a computer program 62, e.g. a computing program, stored in said memory 61 and executable on said processor 60. The processor 60, when executing the computer program 62, implements the steps in the various power soft-start control method embodiments described above, such as the steps 101-105 shown in fig. 1. Alternatively, the processor 60, when executing the computer program 62, implements the functions of the modules/units in the above-described device embodiments, such as the functions of the control circuit shown in fig. 5.
Illustratively, the computer program 62 may be partitioned into one or more modules/units that are stored in the memory 61 and executed by the processor 60 to accomplish the present application. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution of the computer program 62 in the electronic device 6. For example, the computer program 62 may be partitioned into an acquisition module, a comparison module, an output control module, and the like.
The electronic device 6 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The control device may include, but is not limited to, a processor 60, a memory 61. It will be understood by those skilled in the art that fig. 6 is only an example of the electronic device 6, does not constitute a limitation to the electronic device 6, and may include more or less components than those shown, or combine some components, or different components, for example, the control device may further include an input-output device, a network access device, a bus, etc.
The Processor 60 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable Gate Array (FPGA) or other programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 61 may be an internal storage unit of the electronic device 6, such as a hard disk or a memory of the electronic device 6. The memory 61 may also be an external storage device of the electronic device 6, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the electronic device 6. Further, the memory 61 may also include both an internal storage unit and an external storage device of the electronic device 6. The memory 61 is used for storing the computer programs and other programs and data required by the control device. The memory 61 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method of the embodiments described above can be realized by a computer program, which can be stored in a computer-readable storage medium and can realize the steps of the embodiments of the methods described above when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (8)
1. A power supply soft start control method is characterized in that a power supply supplies power to a load through an electronic switch, and the power supply soft start control method comprises the following steps:
acquiring a peak value of overshoot voltage output by the power supply, wherein the overshoot voltage is an overshoot value of the power supply and the load in a one-time switching-on mode;
determining a safe operating voltage of the load;
comparing the peak value of the overshoot voltage with the safe working voltage;
when the peak value of the overshoot voltage is greater than or equal to the safe working voltage, the electronic switch is controlled to be continuously switched on and switched off for a target number of times and then kept switched on;
when the peak value of the overshoot voltage is smaller than the safe working voltage, controlling the electronic switch to be conducted for one time;
the step of controlling the electronic switch to be continuously switched on and off for the target times and then to be kept switched on specifically comprises the following steps:
determining a preset time length according to the pulse width of the overshoot voltage;
acquiring a minimum time interval for controlling the continuous on and off of the electronic switch;
determining the single on-off duration of the electronic switch according to the minimum time interval;
determining the target times according to the ratio of the preset time length to the single on-off time length;
controlling the electronic switch to be switched on and off for a target number of times within the preset time length, and controlling the electronic switch to be kept on after the preset time length;
or, the step of controlling the electronic switch to be continuously turned on and off for the target times and then to be kept on specifically includes:
acquiring a preset value of the output voltage of the power supply;
the peak value of the overshoot voltage is subtracted from the preset value to obtain a first voltage difference value;
the safe working voltage is subtracted from the preset value to obtain a second voltage difference value;
determining the target times according to the first voltage difference value and the second voltage difference value;
and controlling the electronic switch to be continuously switched on and switched off for the target times and then keeping on.
2. The power supply soft start control method according to claim 1, comprising: the single-time on duration of the electronic switch is equal, and the single-time off duration of the electronic switch is equal.
3. The power supply soft start control method according to claim 2, comprising: the single turn-off duration is greater than or equal to the single turn-on duration.
4. The power supply soft start control method according to claim 1, comprising: the target number of times is 5 or more.
5. A power supply soft start control apparatus, wherein a power supply supplies power to a load through an electronic switch, the power supply soft start control apparatus comprising:
the acquisition module is used for acquiring the peak value of overshoot voltage output by the power supply, wherein the overshoot voltage is an overshoot value of the power supply and the load in a one-time switching-on mode;
the acquisition module is used for determining the safe working voltage of the load;
the comparison module is used for comparing the peak value of the overshoot voltage with the safe working voltage; and
the control module is used for controlling the electronic switch to be continuously switched on and switched off for a target number of times and then to be kept switched on when the peak value of the overshoot voltage is greater than or equal to the safe working voltage, and controlling the electronic switch to be switched on once when the peak value of the overshoot voltage is smaller than the safe working voltage;
the control module is specifically configured to:
determining a preset time length according to the pulse width of the overshoot voltage;
acquiring a minimum time interval for controlling the continuous on and off of the electronic switch;
determining the single on-off duration of the electronic switch according to the minimum time interval;
determining the target times according to the ratio of the preset time length to the single on-off time length;
controlling the electronic switch to be switched on and off for a target number of times within the preset time length, and controlling the electronic switch to be kept on after the preset time length;
or acquiring a preset value of the output voltage of the power supply;
the peak value of the overshoot voltage is subtracted from the preset value to obtain a first voltage difference value;
the safe working voltage is subtracted from the preset value to obtain a second voltage difference value;
determining the target times according to the first voltage difference value and the second voltage difference value;
and controlling the electronic switch to be continuously switched on and switched off for the target times and then keeping on.
6. A power supply soft start control device, comprising:
an electronic switch connected in series between a power source and a load; and
a control circuit connected to the control terminal of the electronic switch, the control circuit being configured to perform the method of any one of claims 1 to 4 to enable soft start of the load.
7. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method of any of claims 1 to 4 when executing the computer program.
8. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1 to 4.
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| CN202010885333.2A CN112104217B (en) | 2020-08-28 | 2020-08-28 | Power supply soft start control method and device |
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| CN202010885333.2A CN112104217B (en) | 2020-08-28 | 2020-08-28 | Power supply soft start control method and device |
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| CN103532118A (en) * | 2012-07-03 | 2014-01-22 | 英飞凌科技奥地利有限公司 | Inrush current limiting circuit |
| CN103986123A (en) * | 2013-02-08 | 2014-08-13 | 华硕电脑股份有限公司 | Switch-type power-supply supplying circuit |
| CN105207531A (en) * | 2015-09-11 | 2015-12-30 | 厦门唯科健康科技有限公司 | Soft start method for motor |
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| TWI535180B (en) * | 2015-06-03 | 2016-05-21 | 台達電子工業股份有限公司 | Detection method for failure of soft start and variable frequency drive |
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| CN103532118A (en) * | 2012-07-03 | 2014-01-22 | 英飞凌科技奥地利有限公司 | Inrush current limiting circuit |
| CN103986123A (en) * | 2013-02-08 | 2014-08-13 | 华硕电脑股份有限公司 | Switch-type power-supply supplying circuit |
| CN105207531A (en) * | 2015-09-11 | 2015-12-30 | 厦门唯科健康科技有限公司 | Soft start method for motor |
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