CN112993956A - Overcurrent protection circuit, control method thereof, controller and power supply device - Google Patents
Overcurrent protection circuit, control method thereof, controller and power supply device Download PDFInfo
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- CN112993956A CN112993956A CN201911284367.XA CN201911284367A CN112993956A CN 112993956 A CN112993956 A CN 112993956A CN 201911284367 A CN201911284367 A CN 201911284367A CN 112993956 A CN112993956 A CN 112993956A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/026—Current limitation using PTC resistors, i.e. resistors with a large positive temperature coefficient
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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
The embodiment of the invention provides a control method of an overcurrent protection circuit, wherein the overcurrent protection circuit comprises the following steps: the overcurrent protection circuit comprises a main switching device and a current-limiting branch circuit, wherein two ends of the main switching device are respectively connected with an input end and an output end of the overcurrent protection circuit; the current limiting branch circuit is connected with the main switching device in parallel, and comprises a slave switching device and a current limiting device which are connected in series; the control method comprises the following steps: acquiring voltages of two ends of a main switching device in a conducting state; judging whether the voltage at two ends of the main switching device in a conducting state exceeds a first set value or not; if the voltage at the two ends of the main switching device in the conducting state exceeds the first set value, a main switching off signal is sent to the main switching device to control the main switching device to be switched off; and transmitting a slave switch on signal to the slave switching device. The embodiment of the invention also provides an overcurrent protection circuit, a controller and a power supply device. The invention can prevent the device from being damaged due to overheating when the voltage conversion module inputs overlarge current.
Description
Technical Field
The invention relates to the technical field of electronic equipment, in particular to an overcurrent protection circuit, a control method thereof, a controller and a power supply device.
Background
The power supply part of many system devices has strict safety performance requirements on power supplies, at present, fuses or circuit breakers and the like are usually arranged between a voltage input unit and a power supply unit to prevent overload and short circuit problems caused by input, when overload and short circuit occur, the input fuses are fused, or the circuit breakers are tripped, devices on a rear-end power supply unit are protected in a transient state, and damage caused by overlarge instantaneous current of the devices on the rear-end power supply unit is prevented. However, the fuse or the circuit breaker can be fused or tripped quickly only when the current reaches several times of the rated fusing current, and the fuse can be fused only when the rated fusing current of the fuse lasts for a long time, so that the current passing through the rear-end device is lower than the fusing current of the fuse, and when the current is higher than the rated maximum current, the device is easily over-heated and is easily ignited.
Disclosure of Invention
In order to solve at least one of the above technical problems, embodiments of the present invention provide an overcurrent protection circuit, a control method thereof, a controller, and a power supply device.
In a first aspect, an embodiment of the present invention provides a method for controlling an overcurrent protection circuit, where the overcurrent protection circuit includes: the overcurrent protection circuit comprises a main switching device and a current-limiting branch circuit, wherein two ends of the main switching device are respectively connected with the input end and the output end of the overcurrent protection circuit; the current limiting branch circuit is connected with the main switching device in parallel, the current limiting branch circuit comprises a slave switching device and a current limiting device which are connected in series, and the current limiting device has a resistance value;
the control method comprises the following steps:
acquiring voltages at two ends of the main switching device in a conducting state;
judging whether the voltage at two ends of the main switching device in a conducting state exceeds a first set value or not;
if the voltage at the two ends of the main switching device in the conducting state exceeds the first set value, a main switching off signal is sent to the main switching device to control the main switching device to be switched off; and sending a slave switch conducting signal to the slave switching device to control the slave switching device to conduct.
Optionally, after the step of sending the slave switch conducting signal to the slave switching device, the method further includes:
acquiring the voltage of two ends of the main switching device in the conducting state of the auxiliary switching device;
judging whether the voltage of two ends of the main switching device in the conduction state of the auxiliary switching device exceeds a second set value or not;
and if the voltage of the two ends of the main switching device in the conduction state of the slave switching device does not exceed the second set value, sending a main switching conduction signal to the main switching device to control the conduction of the main switching device.
Optionally, the step of sending a slave switch conducting signal to the slave switching device comprises:
determining the conduction frequency according to the voltage of the two ends of the main switching device in a conduction state;
and sending the slave switch conducting signal to the slave switch device according to the conducting frequency so as to control the slave switch device to be conducted according to the conducting frequency.
Optionally, before the step of obtaining the voltage across the main switching device in the on state, the method further includes:
in response to a power-on signal, sending a slave switch conducting signal to the slave switching device to control the slave switching device to conduct; and sending the main switch turn-off signal to the main switching device;
in response to a capacitance charging completion signal, sending a slave switch turn-off signal to the slave switching device to control the slave switching device to turn off; and sending a main switch conducting signal to the main switch device to control the main switch device to be conducted.
Optionally, if the voltage across the main switching device in the on state exceeds the first set value, the control method further includes:
and sending out a fault prompt signal.
In a second aspect, an embodiment of the present invention further provides a controller, for use in an overcurrent protection circuit, where the overcurrent protection circuit includes: the overcurrent protection circuit comprises a main switching device and a current-limiting branch circuit, wherein two ends of the main switching device are respectively connected with the input end and the output end of the overcurrent protection circuit; the current limiting branch circuit is connected with the main switching device in parallel, the current limiting branch circuit comprises a slave switching device and a current limiting device which are connected in series, and the current limiting device has a resistance value;
the controller includes:
the acquisition module is configured to acquire voltages at two ends of the main switching device in a conducting state;
the judging module is configured to judge whether the voltage at two ends of the main switching device in a conducting state exceeds a first set value;
the control module is configured to send a main switch turn-off signal to the main switch device to control the main switch device to turn off if the voltage at two ends of the main switch device in the on state exceeds the first set value; and sending a slave switch conducting signal to the slave switching device to control the slave switching device to conduct.
Optionally, the obtaining module is further configured to obtain a voltage of the two ends of the master switching device in the on state of the slave switching device after the control module sends the master switching off signal;
the judging module is also configured to judge whether the voltage of the two ends of the main switching device in the conduction state of the auxiliary switching device exceeds a second set value;
the control module is further configured to send a main switch conducting signal to the main switch device to control the main switch device to be conducted if the voltage of the two ends of the main switch device in the conducting state of the slave switch device does not exceed the second set value.
Optionally, the controller further comprises: a frequency determination module configured to determine a turn-on frequency according to a voltage across the main switching device in a turn-on state;
the control module is specifically configured to send the slave switch conducting signal to the slave switching device according to the conducting frequency to control the slave switching device to conduct according to the conducting frequency.
Optionally, the control module is further configured to send a slave switch conducting signal to the slave switch device in response to a power-on signal before acquiring the voltage across the master switch device in the conducting state, so as to control the slave switch device to conduct; and sending the main switch turn-off signal to the main switching device; in response to a capacitance charging completion signal, a slave switch turn-off signal is sent to the slave switching device to control the slave switching device to turn off.
Optionally, the control module is further configured to send a fault notification signal if the voltage across the main switching device in the on state exceeds the first set value.
In a third aspect, an embodiment of the present invention further provides a controller, which includes a processing unit and a storage unit, where the storage unit stores one or more programs, and when the one or more programs are executed by the processing unit, the controller implements the above method.
In a fourth aspect, an embodiment of the present invention further provides an overcurrent protection circuit, including: the overcurrent protection circuit comprises a main switching device, a current-limiting branch circuit, a detector and a controller, wherein two ends of the main switching device are respectively connected with an input end and an output end of the overcurrent protection circuit; the current limiting branch circuit is connected with the main switching device in parallel, the current limiting branch circuit comprises a slave switching device and a current limiting device which are connected in series, and the current limiting device has a resistance value; the detector is used for detecting the voltage at two ends of the main switching device; the controller is the above controller.
In a fifth aspect, an embodiment of the present invention further provides a power supply device, including a voltage input module, a voltage conversion module, and the above-mentioned overcurrent protection circuit, where an input end of the overcurrent protection circuit is connected to the voltage input module, and an output end of the overcurrent protection circuit is connected to the voltage conversion module.
In the embodiment of the invention, when the voltage at two ends of the main switching device exceeds a first set value, the current flowing through the main switching device is indicated to exceed a normal value, namely, the branch where the main switching device is located is overloaded or short-circuited, under the condition, the main switching device is controlled to be closed, the auxiliary switching device is controlled to be conducted, and under the current limiting action of the current limiting device, the current flowing through the devices in the voltage conversion module is reduced, so that the devices are prevented from being heated and damaged. In addition, in the embodiment of the present invention, after the step of sending the slave switch on signal to the slave switching device, if the voltage across the master switching device in the on state of the slave switching device does not exceed the second set value, the master switching device is controlled to be on, that is, after the abnormal fault is resolved, the master switching device can be automatically restored to the on state, so that a manual operation is not required.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 and 2 are two schematic structural diagrams of a power supply portion of a system device in the related art, respectively;
FIG. 3 is a schematic diagram of the structure of the over-current protection circuit in the embodiment of the invention;
fig. 4 is a schematic diagram showing a control method of an overcurrent protection circuit in the embodiment of the invention;
fig. 5 is another schematic diagram illustrating a control method of the over-current protection circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of another structure of the over-current protection circuit in the embodiment of the invention;
fig. 7 shows another schematic structural diagram of the overcurrent protection circuit in the embodiment of the invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Fig. 1 and 2 are two schematic structural diagrams of a power supply portion of a system device in the related art, respectively, as shown in fig. 1 and 2, the power supply portion includes a voltage input module 2 and a voltage transformation module 3, wherein one end of the voltage input module 2 is connected to one end of the voltage transformation module 3, the other end of the voltage input module 2 is connected to the other end of the voltage transformation module 3 through a main switching device VT1 and a fuse FU1 (or a circuit breaker K), and the voltage transformation module 3 provides a single board and other elements with a converted voltage. When an overload or a short circuit occurs in the voltage conversion module 3, the fuse FU1 (or the circuit breaker K) is blown to prevent the devices in the voltage conversion module 3 from being damaged. However, fuse FU1 (or circuit breaker K) does not blow at the nominal rated blowing current of the device, but does blow only when the actual current reaches several times the rated blowing current, and when the current reaches the rated blowing current, it takes a long time to blow the fuse, so that the device in voltage converting module 3 is prone to heat and fire.
As a first aspect of the present invention, a control method of an overcurrent protection circuit is provided, and fig. 3 shows a schematic structural diagram of the overcurrent protection circuit in an embodiment of the present invention, as shown in fig. 3, an input end of the overcurrent protection circuit is connected to a voltage input module 01, an output end of the overcurrent protection circuit 1 is connected to a voltage conversion module 02, and the voltage conversion module 02 may be a DCDC converter. The overcurrent protection circuit 1 includes: the main switching device VT1 and the current-limiting branch circuit, the both ends of main switching device VT1 are connected with the input end and the output end of the overcurrent protection circuit 1 respectively. The current limiting branch circuit is connected in parallel with the main switching device VT1, the current limiting branch circuit comprises a slave switching device VT2 and a current limiting device R which are connected in series, namely, one end of the slave switching device VT2 is connected with one end of the main switching device VT1, the other end of the slave switching device VT2 is connected with one end of the current limiting device R, the other end of the current limiting device R is connected with the other end of the main switching device VT1, and the current limiting device R has a resistance value. The overcurrent protection circuit 1 further includes a controller 10, and the controller 10 is configured to execute a control method of the overcurrent protection circuit. The controller may implement the control method by means of hardware circuits or software. Fig. 4 is a schematic diagram illustrating a control method of an overcurrent protection circuit according to an embodiment of the present invention, where as shown in fig. 4, the control method includes:
and S11, acquiring the voltage of the two ends of the main switching device VT1 in the conducting state.
The overcurrent protection circuit 1 may further include a detector 11, and the detector 11 is connected across the main switching device VT1, so as to detect a voltage across the main switching device VT 1. The voltage obtained in step S11 is the voltage detected by the detector 11 in the on state of the main switching device VT 1.
S12, determining whether the voltage across the main switching device VT1 exceeds a first predetermined value in the on state. If the voltage across the main switching device VT1 exceeds the first set value in the on state, step S13 is performed.
The first setting value may be set according to actual requirements, and may be specifically determined according to a current flowing through the main switching device VT1 when a device in the voltage conversion module is short-circuited or overloaded, and a resistance of the main switching device VT 1.
S13, sending a main switch turn-off signal to the main switching device VT1 to control the main switching device VT1 to turn off; and sending a slave switch turn-on signal to the slave switching device VT2 to control the slave switching device VT2 to turn on.
In the embodiment of the invention, when the voltage across the main switching device VT1 exceeds the first set value, it indicates that the current flowing through the main switching device VT1 exceeds the normal value, that is, the branch where the main switching device VT1 is located is overloaded or short-circuited, in this case, the main switching device VT1 is controlled to be turned off, the auxiliary switching device VT2 is controlled to be turned on, and the current flowing through the devices provided for the voltage conversion module is reduced under the current limiting action of the current limiting device R, so as to prevent the devices from being damaged.
In the embodiment of the present invention, the master switching device VT1 and the slave switching device VT2 may both adopt other controllable devices such as MOS transistors or triodes. The current limiting device R may be a thermistor or other current limiting device.
Fig. 5 is another schematic diagram illustrating a control method of the overcurrent protection circuit according to an embodiment of the present invention, where as shown in fig. 5, the control method of the overcurrent protection circuit includes:
s21, responding to the starting signal, sending a slave switch conducting signal to the slave switch device VT2 to control the slave switch device VT2 to be conducted; and sending a main switching off signal to the main switching device VT1 to control the main switching device VT1 to turn off. At this time, the voltage input module and the voltage conversion module are conducted through the slave switching device VT 2.
The starting signal is a starting signal of equipment where the overcurrent protection circuit is located.
Generally, an electrolytic capacitor is arranged at the front end of the voltage conversion module, and the secondary switching device VT2 is controlled to be conducted when the device is electrically powered on and powered off, so that the problem of overlarge starting impact current caused by transient direct conduction of the electrolytic capacitor at the moment of powering on can be prevented through the current limiting device R.
S22, responding to the capacitor charging completion signal, sending a slave switch turn-off signal to the slave switch device VT2 to control the slave switch device VT2 to turn off; a main switch turn-on signal is sent to the main switching device VT1 to control the main switching device VT1 to turn on.
The current limiting device R may be a resistor. In practical application, the charging time T of the electrolytic capacitor can be determined according to the resistance value of the current limiting device R, and the capacitor charging completion signal is as follows: starting to time from the start of the computer, and generating a signal when the time reaches the charging time T.
And S23, acquiring the voltage of the two ends of the main switching device VT1 in the conducting state.
S24, judging whether the voltage of the main switching device VT1 in the conducting state exceeds a first set value, if so, executing a step S25; otherwise, return to step S23.
S25, sending a main switch turn-off signal to the main switching device VT1 to control the main switching device VT1 to turn off; and sending a slave switch turn-on signal to the slave switching device VT2 to control the slave switching device VT2 to turn on.
Specifically, the step S25 specifically includes:
s251, determining the turn-on frequency f according to the voltage across the main switching device VT1 in the turn-on state. The larger the voltage across the main switching device VT1 in the on state, the smaller the on frequency.
And S252, sending a main switch turn-off signal to the main switching device VT1 to control the main switching device VT1 to turn off.
S253, the slave switch on signal is transmitted to the slave switch device VT2 at the on frequency f, and the slave switch device VT2 is controlled to be turned on at the on frequency f.
It is understood that the slave switching device VT2 is turned on at the turn-on frequency f means that the slave switching device VT2 is turned on f times per unit time.
When the voltage of the main switching device VT1 in the conducting state exceeds a first set value, the main switching device VT1 indicates that an overcurrent or short-circuit fault occurs on a branch circuit where the main switching device VT1 is located, at the moment, the main switching device VT1 is turned off, and the auxiliary switching device VT2 is turned on, so that under the current limiting effect of the current limiting device R, the current and the power are limited in a safe working range, the current and the power consumption of devices in the voltage conversion module are reduced, and the devices are prevented from being ignited; and a radiator is not required to be arranged on the device in the voltage conversion module, and the through-flow requirement on the printed circuit board is reduced. In addition, the slave switching device VT2 is conducted according to the conduction frequency f, so that the current and power of the current limiting device R can be limited within the safe working range by adopting a resistor with a smaller resistance value, thereby reducing the heat consumption of the device and preventing the device from being damaged.
In one embodiment, when the slave switching device VT2 is controlled to be turned on according to the on-frequency f, a fault prompting signal is further sent out and sent to a system MCU (micro-programmed controller), and the system MCU adjusts the load on the system side after receiving the fault prompting signal.
S26, obtaining the voltage of the two ends of the main switch device VT1 in the conducting state of the auxiliary switch device VT 2.
It should be appreciated that when the slave switching device VT2 is turned on, the master switching device VT1 is turned off and the voltage across the master switching device VT1 is the voltage across the current limiting branch.
And S27, judging whether the voltage of the two ends of the main switching device VT1 in the conducting state of the auxiliary switching device VT2 exceeds a second set value, if not, indicating that the overcurrent or short-circuit roadblock on the main switching device VT1 is removed, so as to perform step S28, if so, returning to step S253, so that the auxiliary switching device VT2 is continuously conducted according to the current conducting frequency.
And S28, sending a main switch conducting signal to the main switching device VT1, and controlling the main switching device VT1 to be conducted.
In the embodiment of the invention, when the branch where the main switching device VT1 is located has an abnormal fault such as overcurrent or short circuit, the slave switching device VT2 is controlled to be turned on, so that the devices in the voltage conversion module are protected, and after the abnormal fault is removed, the state of turning on the main switching device VT1 can be automatically recovered, thereby avoiding the operation of manual replacement or reset.
As a second aspect of the present invention, a controller is provided, the controller is used in an overcurrent protection circuit, as shown in fig. 3, the overcurrent protection circuit 1 includes a main switching device VT1 and a current-limiting branch, and two ends of the main switching device VT1 are respectively connected to an input end and an output end of the overcurrent protection circuit 1. The current limiting branch is connected in parallel with the main switching device VT1, and comprises a slave switching device VT2 and a current limiting device R in series.
Fig. 6 shows another schematic structure of the overcurrent protection circuit in the embodiment of the present invention, and as shown in fig. 6, the controller 10 may be implemented by a hardware circuit. The controller 10 includes: the device comprises an acquisition module 11, a judgment module 12 and a control module 13.
The obtaining module 11 is configured to obtain a voltage across the main switching device VT1 in the on state. The obtaining module 11 may be connected to the detector 20, and receive the voltage across the main switching device VT1 detected by the detector 20.
The determination module 12 is configured to determine whether the voltage across the main switching device VT1 in the on state exceeds a first set value.
The control module 13 is configured to send a main switch turn-off signal to the main switching device VT1 to control the main switching device VT1 to turn off if the voltage across the main switching device VT1 in the on state exceeds a first set value; and sending a slave switch turn-on signal to the slave switching device VT2 to control the slave switching device VT2 to turn on.
In one embodiment, the controller 10 further comprises a frequency determination module 14 configured to determine the turn-on frequency based on a voltage across the main switching device VT1 in the on state. The control module 13 is specifically configured to send a slave switch turn-on signal to the slave switching device VT2 at the turn-on frequency to control the slave switching device VT2 to turn on at the turn-on frequency. Specifically, the control module 13 may include a timing control unit 131 and a driving unit 132, the timing control unit 131 generating a series of slave switch on signals and slave switch off signals according to an on frequency, the plurality of slave switch on signals and slave switch off signals alternating, thereby forming a square wave signal. The timing control unit 131 may include a voltage controlled oscillator. The driving unit 132 supplies the square wave signal to the slave switching device VT2, thereby controlling the slave switching device VT2 to switch at the turn-on frequency.
In one embodiment, the control module 13 is further configured to send a slave switch turn-on signal to the slave switch device VT2 to control the slave switch device VT2 to turn on in response to the power-on signal before acquiring the voltage across the master switch device VT1 in the on state; and sending a primary switch turn-off signal to the primary switching device VT 1; in response to the capacitance charging completion signal, a slave switch turn-off signal is sent to the slave switching device VT2 to control the slave switching device VT2 to turn off.
In one embodiment, the obtaining module 11 is further configured to obtain the voltage of the two ends of the master switching device VT1 in the on state of the slave switching device VT2 after the control module 13 sends the master switch off signal. The determination module 12 is further configured to determine whether the voltage across the master switching device VT1 in the on state of the slave switching device VT2 exceeds a second set value. The control module 13 is further configured to send a main switch turn-on signal to the main switching device VT1 to control the main switching device VT1 to turn on if the voltage across the main switching device VT1 in the on state of the slave switching device VT2 does not exceed a second set value.
In one embodiment, the control module is further configured to issue a fault notification signal if the voltage across the main switching device VT1 in the on state exceeds a first set value.
The working principle of each module of the controller refers to the description of the control method in the above embodiments, and is not described herein again.
As a third aspect of the present invention, a controller is provided, fig. 7 shows another schematic structural diagram of an overcurrent protection circuit in an embodiment of the present invention, and unlike fig. 6, a controller 10 in fig. 7 includes a processing unit 101 and a storage unit 102, where the storage unit 102 stores one or more programs, and when the one or more programs are executed by the processing unit 101, the control method in the above-described embodiment is implemented.
As a fourth aspect of the present invention, there is provided an overcurrent protection circuit, as shown in fig. 3, the overcurrent protection circuit 1 including: the overcurrent protection circuit comprises a main switching device VT1, a current-limiting branch circuit, a controller 10 and a detector 20, wherein two ends of the main switching device VT1 are respectively connected with an input end and an output end of the overcurrent protection circuit 1. The current limiting branch is connected in parallel with the main switching device VT1, and comprises a slave switching device VT2 and a current limiting device R in series. The detector 20 is used to detect the voltage across the main switching device VT 1. The controller 10 is the controller in the above embodiment.
In the embodiment of the invention, when the input of the voltage conversion module has overcurrent short circuit or the output has overload, the slave switch device is switched on and the main switch device is switched off, thereby preventing the heat consumption of the devices in the circuit from increasing, and preventing the problems that the routing loss of the devices on the printed circuit board is increased to burn the circuit devices and the like. Moreover, the requirement for the through-flow of the wiring on the printed circuit board is reduced. In addition, when faults such as overcurrent short circuit or overload occur, power supply is not directly cut off, and uninterrupted power supply of the whole power supply device is guaranteed. In addition, after the fault is relieved, the main switching device is automatically conducted, and manual operation is not needed.
As a fifth aspect of the present invention, a power supply apparatus is provided, as shown in fig. 3, the power supply apparatus includes a voltage input module 01, a voltage conversion module 02 and the above-mentioned overcurrent protection circuit 1, an input end of the overcurrent protection circuit 1 is connected to the voltage input module 01, and an output end of the overcurrent protection circuit 1 is connected to the voltage conversion module 02.
As a specific application of the present invention, the power supply apparatus may be used in an on-board device, the voltage input module 01 is used for receiving an input voltage, and the voltage conversion module 02 is connected to each functional module at the rear end and is used for converting a high-voltage dc to a low-voltage dc suitable for each functional module.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (13)
1. A control method of an overcurrent protection circuit, the overcurrent protection circuit comprising: the overcurrent protection circuit comprises a main switching device and a current-limiting branch circuit, wherein two ends of the main switching device are respectively connected with the input end and the output end of the overcurrent protection circuit; the current limiting branch circuit is connected with the main switching device in parallel, the current limiting branch circuit comprises a slave switching device and a current limiting device which are connected in series, and the current limiting device has a resistance value;
the control method comprises the following steps:
acquiring voltages at two ends of the main switching device in a conducting state;
judging whether the voltage at two ends of the main switching device in a conducting state exceeds a first set value or not;
if the voltage at the two ends of the main switching device in the conducting state exceeds the first set value, a main switching off signal is sent to the main switching device to control the main switching device to be switched off; and sending a slave switch conducting signal to the slave switching device to control the slave switching device to conduct.
2. The control method of claim 1, wherein the step of sending a slave switch on signal to the slave switching device is followed by further comprising:
acquiring the voltage of two ends of the main switching device in the conducting state of the auxiliary switching device;
judging whether the voltage of two ends of the main switching device in the conduction state of the auxiliary switching device exceeds a second set value or not;
and if the voltage of the two ends of the main switching device in the conduction state of the slave switching device does not exceed the second set value, sending a main switching conduction signal to the main switching device to control the conduction of the main switching device.
3. The control method of claim 1, wherein the step of transmitting a slave switch on signal to the slave switching device comprises:
determining the conduction frequency according to the voltage of the two ends of the main switching device in a conduction state;
and sending the slave switch conducting signal to the slave switch device according to the conducting frequency so as to control the slave switch device to be conducted according to the conducting frequency.
4. The control method according to any one of claims 1 to 3, wherein the step of obtaining the voltage across the main switching device in the on state is preceded by:
in response to a power-on signal, sending a slave switch conducting signal to the slave switching device to control the slave switching device to conduct; and sending the main switch turn-off signal to the main switching device;
in response to a capacitance charging completion signal, sending a slave switch turn-off signal to the slave switching device to control the slave switching device to turn off; and sending a main switch conducting signal to the main switch device to control the main switch device to be conducted.
5. The control method according to any one of claims 1 to 3, wherein if the voltage across the main switching device in the on state exceeds the first set value, the control method further comprises:
and sending out a fault prompt signal.
6. A controller for use in an over-current protection circuit, the over-current protection circuit comprising: the overcurrent protection circuit comprises a main switching device and a current-limiting branch circuit, wherein two ends of the main switching device are respectively connected with the input end and the output end of the overcurrent protection circuit; the current limiting branch circuit is connected with the main switching device in parallel, the current limiting branch circuit comprises a slave switching device and a current limiting device which are connected in series, and the current limiting device has a resistance value;
the controller includes:
the acquisition module is configured to acquire voltages at two ends of the main switching device in a conducting state;
the judging module is configured to judge whether the voltage at two ends of the main switching device in a conducting state exceeds a first set value;
the control module is configured to send a main switch turn-off signal to the main switch device to control the main switch device to turn off if the voltage at two ends of the main switch device in the on state exceeds the first set value; and sending a slave switch conducting signal to the slave switching device to control the slave switching device to conduct.
7. The controller of claim 6, wherein the obtaining module is further configured to obtain the voltage across the master switching device in the on state of the slave switching device after the control module sends the master switch off signal;
the judging module is also configured to judge whether the voltage of the two ends of the main switching device in the conduction state of the auxiliary switching device exceeds a second set value;
the control module is further configured to send a main switch conducting signal to the main switch device to control the main switch device to be conducted if the voltage of the two ends of the main switch device in the conducting state of the slave switch device does not exceed the second set value.
8. The controller of claim 6, wherein the controller further comprises: a frequency determination module configured to determine a turn-on frequency according to a voltage across the main switching device in a turn-on state;
the control module is specifically configured to send the slave switch conducting signal to the slave switching device according to the conducting frequency to control the slave switching device to conduct according to the conducting frequency.
9. The controller of any one of claims 6 to 8, wherein the control module is further configured to send a slave switch turn-on signal to the slave switch device to control the slave switch device to turn on in response to a power-on signal before acquiring the voltage across the master switch device in the on state; and sending the main switch turn-off signal to the main switching device; in response to a capacitance charging completion signal, a slave switch turn-off signal is sent to the slave switching device to control the slave switching device to turn off.
10. The controller of any one of claims 6 to 8, wherein the control module is further configured to issue a fault notification signal if the voltage across the main switching device in the on state exceeds the first set value.
11. A controller comprising a processing unit and a storage unit, the storage unit having one or more programs stored thereon which, when executed by the processing unit, implement the method of any of claims 1 to 5.
12. An overcurrent protection circuit comprising: the overcurrent protection circuit comprises a main switching device, a current-limiting branch circuit, a detector and a controller, wherein two ends of the main switching device are respectively connected with an input end and an output end of the overcurrent protection circuit; the current limiting branch circuit is connected with the main switching device in parallel, the current limiting branch circuit comprises a slave switching device and a current limiting device which are connected in series, and the current limiting device has a resistance value; the detector is used for detecting the voltage at two ends of the main switching device; the controller is as claimed in any one of claims 6 to 11.
13. A power supply apparatus comprising a voltage input module, a voltage conversion module and the over-current protection circuit of claim 12, wherein an input terminal of the over-current protection circuit is connected to the voltage input module, and an output terminal of the over-current protection circuit is connected to the voltage conversion module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911284367.XA CN112993956A (en) | 2019-12-13 | 2019-12-13 | Overcurrent protection circuit, control method thereof, controller and power supply device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911284367.XA CN112993956A (en) | 2019-12-13 | 2019-12-13 | Overcurrent protection circuit, control method thereof, controller and power supply device |
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| CN112993956A true CN112993956A (en) | 2021-06-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113541488A (en) * | 2021-06-28 | 2021-10-22 | 中车青岛四方机车车辆股份有限公司 | Boost chopper circuit, protection circuit, control method, equipment and vehicle |
-
2019
- 2019-12-13 CN CN201911284367.XA patent/CN112993956A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113541488A (en) * | 2021-06-28 | 2021-10-22 | 中车青岛四方机车车辆股份有限公司 | Boost chopper circuit, protection circuit, control method, equipment and vehicle |
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