CN117707315A - Protection circuit, power supply circuit and control method of power supply path of electric equipment - Google Patents
Protection circuit, power supply circuit and control method of power supply path of electric equipment Download PDFInfo
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Abstract
The invention relates to the technical field of electronics, and provides a protection circuit, a power supply circuit and a control method of a power supply path of electric equipment, wherein the protection circuit comprises: a differential pressure acquisition module for determining a differential pressure based on a current in the power supply path; the voltage comparison module is used for comparing the voltage difference with a preset voltage threshold value and determining the current condition in the power supply path according to the comparison result; and the protection unit is used for determining the current abnormality duration time in the power supply path according to the current condition and controlling the current output of the power supply unit according to the current abnormality duration time. The protection circuit, the power supply circuit and the control method of the power supply path of the electric equipment can monitor the current condition in the power supply path in real time, determine the abnormal duration of the current in the power supply path according to the current condition, timely control the current of the power supply unit to be not output when the abnormal duration of the current is overlong, ensure that the power supply path is timely stopped, and further ensure that the equipment is not influenced.
Description
Technical Field
The present invention relates to the field of electronic technologies, and in particular, to a protection circuit, a power supply circuit, and a control method for a power supply path of an electric device.
Background
As servers are applied to more and more fields, so too are the functions that the servers need to implement. In order to realize these functions, there are more and more devices that the server needs to support, and there are more and more devices that need to perform management control. Since the power supply requirements of the respective devices are different, in order to ensure that all the devices can operate normally, the power supply unit (i.e., the current conversion chip) of the front end must meet the requirements of the maximum specification in the back end device. Meanwhile, in order to realize the protection function of the whole circuit, a conversion chip of the front-end power supply needs to be provided with a proper overcurrent protection point.
The back-end equipment power requirements can be divided into rated power requirements and instantaneous peak power requirements. The instantaneous peak power supply requirement is relatively large, and the overcurrent protection point needs to cover the requirement, so that the overcurrent protection is prevented from being triggered by mistake.
Under the general working scene, the circuit can work normally, and when abnormality occurs, the protection function can be triggered. However, in some situations, such a design does not trigger a protection function, and cannot cut off the power supply in time, preventing more serious anomalies from occurring.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides a protection circuit, a power supply circuit and a control method of a power supply path of electric equipment.
The invention provides a protection circuit of a power supply path of electric equipment, which comprises a voltage difference acquisition module, a voltage comparison module and a protection unit, wherein:
a differential pressure acquisition module for determining a differential pressure based on a current in the power supply path;
the voltage comparison module is used for comparing the voltage difference with a preset voltage threshold value and determining the current condition in the power supply path according to a comparison result;
the protection unit is used for determining the current abnormality duration in the power supply path according to the current condition and controlling the current output of the power supply unit according to the current abnormality duration;
the power supply unit is used for transmitting current to the power supply path.
In one embodiment, the protection unit comprises a timing module and a control module, wherein:
the timing module is used for determining the duration of the abnormal current in the power supply path according to the current condition;
and the control module is used for controlling the current output of the power supply unit according to the current abnormality duration.
In one embodiment, when monitoring the first number of power supply paths, the differential pressure acquisition module is further configured to:
determining a differential pressure based on the current in each power supply path, and recording a power supply path identifier with the differential pressure of 0 and a corresponding no-current duration time when the differential pressure is 0;
correspondingly, the protection unit is further configured to:
and determining a second number of power supply paths with the current-free duration longer than the first duration based on the power supply path identifier with the voltage difference of 0 and the corresponding current-free duration, and controlling the power supply unit to suspend current output when the ratio of the second number to the second number is higher than a preset ratio.
In one embodiment, the voltage difference acquisition module comprises an amplifier, wherein a first input end and a second input end of the amplifier are respectively connected with a first voltage position point and a second voltage position point on the power supply path; the output end of the amplifier is connected with the input end of the voltage comparison module.
In one embodiment, the voltage comparison module comprises a comparator, a first resistor, and a second resistor, wherein:
the first input end of the comparator is connected with the output end of the amplifier, the second input end of the comparator is connected with a first resistor and a second resistor, the other end of the first resistor is grounded, and the other end of the second resistor is connected with a first access voltage; the output end of the comparator is connected with the input end of the protection unit.
In one embodiment, the timing module includes a first MOS transistor, a third resistor, a first capacitor, a second MOS transistor, and a first diode, wherein:
the grid electrode of the first MOS tube is connected with the output end of the comparator, the source electrode of the first MOS tube is connected with the second access voltage, the drain electrode of the first MOS tube is connected with one end of the third resistor, the other end of the third resistor is respectively connected with one end of the first capacitor and one end of the first diode, the other end of the first diode is connected with the grid electrode of the second MOS tube, and the other end of the first capacitor is grounded;
the source electrode of the second MOS tube is respectively connected with a third access voltage and the input end of the control module; and the drain electrode of the second MOS tube is grounded.
In one embodiment, the control module includes a complex programmable logic device CPLD, an access terminal of the complex programmable logic device CPLD is connected to a source electrode of the second MOS transistor, and an output terminal of the complex programmable logic device CPLD is connected to the power supply unit.
In one embodiment, the timing module further comprises a second diode connected between the first diode and the gate of the second MOS transistor.
The invention also provides a power supply circuit which comprises a power supply unit, a power supply path and the protection circuit.
The invention also provides a control method applied to the protection circuit, which comprises the following steps:
determining a differential pressure based on the current in the power supply path;
comparing the voltage difference with a preset voltage threshold value, and determining the current condition in the power supply path according to a comparison result;
and determining the current abnormality duration in the power supply path according to the current condition, and controlling the current output of the power supply unit according to the current abnormality duration.
The protection circuit, the power supply circuit and the control method of the power supply path of the electric equipment can monitor the current condition in the power supply path in real time, and timely control the current of the power supply unit to be no longer output when the current condition indicates that the current on the power supply path is abnormal, so that the power supply path is prevented from being damaged timely, and the equipment is further prevented from being influenced.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a protection circuit of a power supply path of an electric device according to the present invention;
FIG. 2 is a second schematic diagram of a protection circuit of a power supply path of an electric device according to the present invention;
FIG. 3 is a schematic diagram of a protection circuit for a power supply path of an electrical device according to the present invention;
fig. 4 is a flow chart of a control method of the protection circuit provided by the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The following describes a protection circuit, a power supply circuit and a control method for a power supply path of an electric device in accordance with fig. 1 to 4.
Fig. 1 shows a schematic structural diagram of a protection circuit of a power supply path of an electric device according to the present invention, referring to fig. 1, it can be seen that the protection circuit of the power supply path includes a voltage difference obtaining module 11, a voltage comparing module 12, and a protection unit 13, where:
a differential pressure acquisition module 11 for determining a differential pressure based on a current in the power supply path;
the voltage comparison module 12 is used for comparing the voltage difference with a preset voltage threshold value and determining the current condition in the power supply path according to the comparison result;
a protection unit 13 for determining a current abnormality duration in the power supply path according to the current condition, and controlling a current output of the power supply unit according to the current abnormality duration;
the power supply unit is used for transmitting current to the power supply path.
In this regard, it should be noted that as servers are applied to more and more fields, more functions are required to be implemented by the servers. In order to realize these functions, there are more and more devices that the server needs to support, and there are more and more devices that need to perform management control. Since the power supply requirements of the respective devices are different, in order to ensure that all the devices can operate normally, the power supply unit (i.e., the current conversion chip) of the front end must meet the requirements of the maximum specification in the back end device. Meanwhile, in order to realize the protection function of the whole circuit, a conversion chip of the front-end power supply needs to be provided with a proper overcurrent protection point.
The back-end equipment power requirements can be divided into rated power requirements and instantaneous peak power requirements. The instantaneous peak power supply requirement is relatively large, and the overcurrent protection point needs to cover the requirement, so that the overcurrent protection is prevented from being triggered by mistake.
The conversion chip of the front-end power supply converts the current of the front-end power supply, outputs proper current to flow through a power supply path, and then provides the proper current to the equipment at the rear end. The power supply path comprises more than one power supply path, and each power supply path normally bears a part of current, and the current that each path can bear has an upper limit value according to the design condition. It can be seen that the power supply path is designed in the form of a board card. In order to avoid that the normal working power supply path bears a current load far larger than the design specification, the whole path can quickly generate heat due to overlarge load to cause board burning, so that the current condition in the power supply path needs to be monitored in real time. In the invention, the voltage difference acquisition module 11 and the voltage comparison module 12 can be electrically connected with the power supply path, so as to monitor the current in the power supply path, determine the voltage difference based on the current in the power supply path, inform the voltage comparison module of the voltage difference, compare the voltage difference with a preset voltage threshold value, and determine the current condition in the power supply path according to the comparison result.
In the invention, a voltage mode is adopted to represent the current condition on the power supply path, and a differential pressure acquisition module is arranged, and voltage is measured at two ends of the power supply path through the differential pressure acquisition module. When a current flows in the power supply path, a voltage difference must be generated across the two ends.
In the invention, the differential pressure acquisition module acquires the differential pressure on the power supply path, which represents the actual current condition of the power supply path, and the acquired differential pressure needs to be compared with the voltage threshold value in order to know whether the actual current condition is normal or abnormal.
In the present invention, when it is monitored that an abnormal current exists in the power supply path, it is necessary to control the power supply unit to stop the current output. Therefore, in the invention, a protection unit is arranged, the protection unit is connected with the monitoring unit and the power supply unit, the current condition is obtained, then a corresponding control instruction is made according to the current condition, then the control instruction is sent to the power supply unit, and the power supply unit makes a corresponding current control operation.
In the present invention, the current condition is a condition in which a current flowing through the power supply path is normal or abnormal. The current condition can be represented by the current or voltage, or the duration of current abnormality, and because the short-time instantaneous peak power supply requirement can be allowed on the power supply path, only the overlong duration of abnormality can be judged as the current abnormality on the power supply path, and the measure for controlling the current output can be made.
The protection circuit of the power supply path of the electric equipment can monitor the current condition in the power supply path in real time, determine the abnormal duration of the current in the power supply path according to the current condition, timely control the current of the power supply unit to be no longer output when the abnormal duration of the current is overlong, ensure that the power supply path is timely stopped from being damaged, and further ensure that the equipment is not affected.
In the above-mentioned further circuit of the protection circuit, mainly, a further explanation of the specific structure of the protection unit is shown in fig. 2, and specifically as follows:
the protection unit comprises a timing module 131 and a control module 132, wherein:
a timing module 131 for determining a duration of the current anomaly in the power supply path according to the current condition;
the control module 132 is used for controlling the current output of the power supply unit according to the duration of the current abnormality.
In this regard, in the present invention, since the short-time instantaneous peak power supply demand can be allowed on the power supply path, only the excessively long abnormality duration can be determined as the abnormality of the current on the power supply path, and a measure for controlling the current output can be made. A timing module is provided that determines the duration of the current anomaly in the power path based on the current condition. Then, a control module is arranged, and the control module controls the current output of the power supply unit according to the current abnormality duration.
In the further circuit of the protection circuit, a plurality of power supply paths are mainly used for explaining the condition that the rear-end equipment carries current, when one or even a plurality of power supply paths are abnormal and power supply is interrupted, all current loads at the rear end can be born through the rest power supply paths, but the normally working power supply paths bear the current loads far larger than the design specification, and the whole paths can quickly generate heat due to overlarge loads, so that board burning is caused. Therefore, when a plurality of power supply paths are configured to supply current to the back-end equipment, after a certain number of power supply paths interrupt power supply, the power supply paths need to be timely powered off, so that the rest power supply paths which work normally can be prevented from bearing excessive current loads. Therefore, the first number of power supply paths need to be monitored, the differential pressure acquisition module needs to determine the differential pressure based on the current in each power supply path, when the differential pressure is 0, the power supply path identification and the corresponding no-current duration time with the differential pressure being 0 are recorded, then the power supply path identification and the corresponding no-current duration time with the differential pressure being 0 are informed to the protection unit, at the moment, the protection unit determines the second number of power supply paths with the no-current duration time longer than the first duration time based on the power supply path identification and the corresponding no-current duration time with the differential pressure being 0, and controls the power supply unit to suspend current output when the ratio of the second number to the second number is higher than the preset ratio.
Referring to fig. 3, fig. 3 shows a more specific schematic structural diagram of a protection circuit of a power supply path of a powered device in use, which is specifically as follows:
the differential pressure acquisition module includes an amplifier U1.
The voltage comparison module comprises a comparator U2, a first resistor R1 and a second resistor R2.
The timing module comprises a first MOS tube Q1, a third resistor R3, a first capacitor C1, a second MOS tube Q2 and a first diode D1. The timing module also includes a second diode D2.
The control module comprises a complex programmable logic device CPLD.
The connection relation between the above components is as follows:
the first input end and the second input end of the amplifier U1 are respectively connected with a first voltage position point and a second voltage position point on the power supply path; the output of the amplifier U1 is connected to a first input of the comparator U2.
The second input end of the comparator U2 is connected with a first resistor R1 and a second resistor R2, the other end of the first resistor R1 is grounded, and the other end of the second resistor R2 is connected with a first access voltage VCC1; the output end of the comparator U2 is connected with the grid electrode of the first MOS tube Q1.
The source electrode of the first MOS tube Q1 is connected with the second access voltage, the drain electrode of the first MOS tube Q1 is connected with one end of a third resistor R3, the other end of the third resistor R3 is respectively connected with one end of a first capacitor C1 and one end of a first diode D1, the other end of the first diode D1 is connected with the grid electrode of a second MOS tube Q2, and the other end of the first capacitor C1 is grounded;
the source electrode of the second MOS tube Q2 is respectively connected with the third access voltage VCC3 and the input end of the control module; the drain electrode of the second MOS transistor Q2 is grounded.
The access terminal of the complex programmable logic device CPLD is connected with the source electrode of the second MOS tube Q2, and the output terminal of the complex programmable logic device CPLD is connected with the power supply unit.
The second diode D2 is connected between the first diode D1 and the gate of the second MOS transistor Q2.
In the present invention, a voltage is measured across the power supply path. When a current flows in the power supply path, a voltage difference must be generated across the two ends. Since the power supply path has a small resistance, the original voltage difference signal is also small, so that the voltage difference signal is first introduced into the amplifier U1 for amplification and then is input into one end of the comparator U2. The other end of the comparator U2 is preset with a voltage division signal, and the voltage division signal is calculated according to the rated current flowing through the power supply path. Referring to fig. 3, the voltage division signal is voltage division adjustment controlled on the first access voltage VCC1 by the first resistor R1 and the second resistor R2.
When the current flowing through the power supply path does not exceed the rated current, the measured differential pressure signal is smaller than a preset value, and the comparator U2 keeps a low level. When the current flowing through the power supply path exceeds the rated current, the measured differential pressure signal is larger than a preset value, and the comparator U2 keeps high level. At this time, the protection measure for the power supply path may be turned on based on the low level changing to the high level.
However, as previously described, there is a transient peak current when the device is in use. This current will exceed the rated current but will generally be of a relatively short duration without risking the power supply path. So that no protection action is required if it is the instantaneous peak current of the device that causes the current in the supply path to exceed the rated current. Therefore, when the current on the power supply path is monitored to be larger than the rated current value, the protection action cannot be immediately performed, and the following judgment basis needs to be obtained, as follows:
the current in the power supply path due to the abnormality is larger than the rated current value, and is generally continuous and takes a long time. At this time, a protective action is required.
Referring to fig. 3, when the current on the power supply path exceeds the rated current, the comparator U2 outputs a high level, at this time, the first MOS transistor Q1 is turned on, the second access voltage VCC2 charges the capacitor C1, and after a set time is reached, the second MOS transistor Q2 is turned on. The time set by the capacitor charging is the maximum time that the rated current can be exceeded on the allowed power supply path, namely the duration of the current abnormality. Over this time, an abnormal condition is set at this time, and the protection operation is immediately performed. That is, when the second MOS transistor Q2 is turned on, the current abnormality duration exceeds the preset duration.
Because the second MOS transistor Q2 is turned on, the third access voltage VCC3 changes its level, and this signal is input to the CPLD. When the signal goes high and low again, the CPLD turns off the enable signal of the front-end conversion chip, and thus turns off the output. At this time, no current flows through the power supply path, so that danger is avoided.
The following is explained with reference to fig. 3, by way of specific example, as follows:
assuming that the power supply path 1 is a protection target, a differential pressure signal is measured at two ends of the power supply path 1, and the differential pressure signal is introduced into the amplifier U1 for processing. Specific examples are: the rated current of the power supply path 1 is 20 amperes, the voltage difference of two ends of the path is 5 millivolts, and the amplification factor of U1 is 100 times.
The voltage difference across the power supply path 1 under the rated current load is calculated, and then, with reference to the VCC1 voltage, R1, R2 are set so that the divided voltage thereof is equal to the voltage difference across the power supply path 1 under the rated current load. Specific examples are: under the rated current condition, the voltage difference between two ends of the power supply path 1 is 500 millivolts after passing through the amplifier U1, and assuming that VCC1 is 5 volts and R2 is 10 Kohms, R3 can be calculated to be 90 Kohms.
The back-end equipment specification is first queried to determine the duration of its instantaneous peak current. Then, the timing time can be set on the basis of the time according to the specific design condition of the power supply path and the level of protection requirements. When the requirements are strict, the set time is slightly longer than the specification time; the requirements are relaxed and can be longer. However, the general principle is that the set time is necessarily longer than the specification time of the inquiry. Then, the appropriate R3, C1 is selected. Specific examples are: assuming that the time for the querying device to instantaneously exceed the rated current is 400 microseconds, the timing time target is set slightly longer, on the order of 700 microseconds, in order to avoid false triggering. C1 was set to the usual 0.1 microfarads, two diodes with silicon tubes. Thus, Q2 will be turned on when the voltage across C1 rises to around 1.5 volts. The RC delay calculation formula is t= -R1C1 xn [ (U1-U2)/U1 ], wherein U1 is VCC1 voltage, and the voltage at two ends of U2 bit C1. As calculated, the time t is approximately 713 microseconds when R1 is 20K ohms.
When the current on the power supply path 1 exceeds the rated value, the comparator U2 outputs a high level, and the timer circuit is started. When the current on the power supply path 1 exceeds the rated value for only a short time, the timer circuit does not exceed the set time, and Q2 is not turned on. At this time, the control line is not operated. When the current on the power supply path 1 continues to exceed the rated value, the timer circuit exceeds the set time, turning on Q2. At this time, VCC3 is pulled down, after the CPLD monitors the signal change, the CPLD pulls down the enable signal of the conversion chip, cuts off the output of the conversion circuit, prevents the power supply path 1 from being burned out, and sets that the enable signal can be pulled up again only after the whole machine is powered up again. Specific examples are: when the current on path 1 exceeds 20A, as set forth above, the voltage differential signal across the path will exceed 500 millivolts, U2 outputs a high level to turn Q1 on, VCC1 charges C1, and the timer begins. When the current on the path 1 exceeds the rated current for a duration exceeding 713 microseconds, Q2 is turned on, VCC3 is pulled down from the original 3.3 volts, CPLD acts to pull down the enable signal of the conversion chip, and the output of the conversion circuit is cut off, so that the power supply path 1 is prevented from being burnt out.
The invention also provides a power supply circuit which comprises a power supply unit, a power supply path and the protection circuit. See fig. 3 for a specific block diagram.
Based on the above-described structure diagram of fig. 3, a specific operation principle of the control circuit will be described in detail as follows:
in the present invention, a voltage is measured across the power supply path. When a current flows in the power supply path, a voltage difference must be generated across the two ends. It is first introduced into the amplifier U1 for amplification and then input to one end of the comparator U2. The other end of the comparator U2 is preset with a voltage division signal, and the voltage division signal is calculated according to the rated current flowing through the power supply path. Referring to fig. 3, the voltage division signal is voltage division adjustment controlled on the first access voltage VCC1 by the first resistor R1 and the second resistor R2.
When the current flowing through the power supply path does not exceed the rated current, the measured differential pressure signal is smaller than a preset value, and the comparator U2 keeps a low level. When the current flowing through the power supply path exceeds the rated current, the measured differential pressure signal is larger than a preset value, and the comparator U2 keeps high level.
Referring to fig. 3, when the current on the power supply path exceeds the rated current, the comparator U2 outputs a high level, at this time, the first MOS transistor Q1 is turned on, the second access voltage VCC2 charges the capacitor C1, and after a set time is reached, the second MOS transistor Q2 is turned on. The time set by the capacitor charging is the maximum time that the rated current can be exceeded on the allowed power supply path, namely the duration of the current abnormality. Over this time, an abnormal condition is set at this time, and the protection operation is immediately performed. That is, when the second MOS transistor Q2 is turned on, the current abnormality duration exceeds the preset duration.
Because the second MOS transistor Q2 is turned on, the third access voltage VCC3 changes its level, and this signal is input to the CPLD. When the signal goes high and low again, the CPLD turns off the enable signal of the front-end conversion chip, and thus turns off the output. At this time, no current flows through the power supply path, so that danger is avoided.
Referring to fig. 4, the present invention further provides a control method applied to the protection circuit, including:
41. determining a differential pressure based on the current in the power supply path;
42. comparing the voltage difference with a preset voltage threshold value, and determining the current condition in the power supply path according to the comparison result;
43. and determining the current abnormality duration in the power supply path according to the current condition, and controlling the current output of the power supply unit according to the current abnormality duration.
In a further method of the above method, when monitoring the first number of power supply paths, determining a differential pressure based on the current in each power supply path, and when the differential pressure is 0, recording a power supply path identifier and a corresponding no-current duration time with the differential pressure of 0;
and determining a second number of power supply paths with the current-free duration longer than the first duration based on the power supply path identifier with the voltage difference of 0 and the corresponding current-free duration, and controlling the power supply unit to suspend current output when the ratio of the second number to the second number is higher than a preset ratio.
The control method of the protection circuit provided by the embodiment of the invention can monitor the current condition in the power supply path in real time, determine the abnormal duration of the current in the power supply path according to the current condition, and timely control the current of the power supply unit to be no longer output when the abnormal duration of the current is overlong, so that the power supply path is prevented from being damaged in time, and the equipment is further prevented from being influenced.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a protection circuit of power supply path of consumer, its characterized in that includes pressure differential acquisition module, voltage comparison module and protection element, wherein:
a differential pressure acquisition module for determining a differential pressure based on a current in the power supply path;
the voltage comparison module is used for comparing the voltage difference with a preset voltage threshold value and determining the current condition in the power supply path according to a comparison result;
the protection unit is used for determining the current abnormality duration in the power supply path according to the current condition and controlling the current output of the power supply unit according to the current abnormality duration;
the power supply unit is used for transmitting current to the power supply path.
2. The protection circuit of a power supply path of a powered device of claim 1, wherein the protection unit comprises a timing module and a control module, wherein:
the timing module is used for determining the duration of the abnormal current in the power supply path according to the current condition;
and the control module is used for controlling the current output of the power supply unit according to the current abnormality duration.
3. The protection circuit of a power supply path of a powered device according to claim 1 or 2, wherein the differential pressure acquisition module is further configured to, when monitoring the first number of power supply paths:
determining a differential pressure based on the current in each power supply path, and recording a power supply path identifier with the differential pressure of 0 and a corresponding no-current duration time when the differential pressure is 0;
correspondingly, the protection unit is further configured to:
and determining a second number of power supply paths with the current-free duration longer than the first duration based on the power supply path identifier with the voltage difference of 0 and the corresponding current-free duration, and controlling the power supply unit to suspend current output when the ratio of the second number to the second number is higher than a preset ratio.
4. The protection circuit of a power supply path of an electrical device according to claim 2, wherein the voltage difference obtaining module comprises an amplifier, and a first input end and a second input end of the amplifier are respectively connected with a first voltage position point and a second voltage position point on the power supply path; the output end of the amplifier is connected with the input end of the voltage comparison module.
5. The protection circuit of a power supply path of a powered device of claim 4, wherein the voltage comparison module comprises a comparator, a first resistor, and a second resistor, wherein:
the first input end of the comparator is connected with the output end of the amplifier, the second input end of the comparator is connected with a first resistor and a second resistor, the other end of the first resistor is grounded, and the other end of the second resistor is connected with a first access voltage; the output end of the comparator is connected with the input end of the protection unit.
6. The protection circuit of a power supply path of a powered device of claim 5, wherein the timing module comprises a first MOS transistor, a third resistor, a first capacitor, a second MOS transistor, and a first diode, wherein:
the grid electrode of the first MOS tube is connected with the output end of the comparator, the source electrode of the first MOS tube is connected with the second access voltage, the drain electrode of the first MOS tube is connected with one end of the third resistor, the other end of the third resistor is respectively connected with one end of the first capacitor and one end of the first diode, the other end of the first diode is connected with the grid electrode of the second MOS tube, and the other end of the first capacitor is grounded;
the source electrode of the second MOS tube is respectively connected with a third access voltage and the input end of the control module; and the drain electrode of the second MOS tube is grounded.
7. The protection circuit of a power supply path of a powered device according to claim 5, wherein the control module includes a complex programmable logic device CPLD, an access terminal of the complex programmable logic device CPLD is connected to a source electrode of the second MOS transistor, and an output terminal of the complex programmable logic device CPLD is connected to the power supply unit.
8. The protection circuit of a power supply path of a powered device of claim 5, wherein the timing module further comprises a second diode connected between the first diode and a gate of the second MOS transistor.
9. A power supply circuit comprising a power supply unit, a power supply path and a protection circuit as claimed in any one of the preceding claims 1-8.
10. A control method based on the protection circuit of any one of the preceding claims 1-8, characterized by comprising:
determining a differential pressure based on the current in the power supply path;
comparing the voltage difference with a preset voltage threshold value, and determining the current condition in the power supply path according to a comparison result;
and determining the current abnormality duration in the power supply path according to the current condition, and controlling the current output of the power supply unit according to the current abnormality duration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311434209.4A CN117707315A (en) | 2023-10-31 | 2023-10-31 | Protection circuit, power supply circuit and control method of power supply path of electric equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311434209.4A CN117707315A (en) | 2023-10-31 | 2023-10-31 | Protection circuit, power supply circuit and control method of power supply path of electric equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117707315A true CN117707315A (en) | 2024-03-15 |
Family
ID=90155920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311434209.4A Pending CN117707315A (en) | 2023-10-31 | 2023-10-31 | Protection circuit, power supply circuit and control method of power supply path of electric equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117707315A (en) |
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2023
- 2023-10-31 CN CN202311434209.4A patent/CN117707315A/en active Pending
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