CN217063250U - Power supply short-circuit protection circuit of electronic equipment and electronic equipment - Google Patents
Power supply short-circuit protection circuit of electronic equipment and electronic equipment Download PDFInfo
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- CN217063250U CN217063250U CN202220708746.8U CN202220708746U CN217063250U CN 217063250 U CN217063250 U CN 217063250U CN 202220708746 U CN202220708746 U CN 202220708746U CN 217063250 U CN217063250 U CN 217063250U
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Abstract
The disclosure relates to a power supply short-circuit protection circuit of electronic equipment and the electronic equipment, wherein the power supply short-circuit protection circuit of the electronic equipment comprises a first switch module, a second switch module and a first voltage division module; the second switch module is electrically connected with the first switch module and the first voltage division module respectively, and the first voltage division module is connected with an adapter power supply signal; the first switch module selects to access a power supply load power supply signal or an adapter power supply signal according to the short-circuit state of the power supply load power supply signal and adjusts a switch control signal output to the second switch module according to the accessed signal, and the second switch module selects to access the switch control signal or a voltage division signal output by the first voltage division module and adjusts an output enable signal according to the accessed signal; the enabling signal is used for controlling the on-off of a power supply line from a power supply load power supply signal to the power supply load. Through the technical scheme, the power load and the adapter are prevented from being burnt down when the power supply end of the power load is short-circuited, and the safety of the electronic equipment is improved.
Description
Technical Field
The present disclosure relates to the field of integrated circuit technologies, and in particular, to a power supply short-circuit protection circuit for an electronic device and an electronic device.
Background
At present, the power supply end of a power load on a notebook computer has no short-circuit protection function, and when the power supply end of the power load is short-circuited and a power adapter is inserted, large-area hot melting of a computer mainboard can be caused.
Power adapter has self-protection function among the prior art, but appears the short circuit when the power load supply end, can make power adapter hot melt to cause secondary damage to power adapter and mains load, influence power adapter's life-span.
SUMMERY OF THE UTILITY MODEL
In order to solve the above technical problem or at least partially solve the above technical problem, the present disclosure provides a power supply short circuit protection circuit for an electronic device and an electronic device, which avoid burning a power supply load and an adapter when a power supply terminal of the power supply load is short-circuited, and improve the safety of the electronic device.
In a first aspect, an embodiment of the present disclosure provides a power supply short-circuit protection circuit for an electronic device, including:
the circuit comprises a first switch module, a second switch module and a first voltage division module; the second switch module is respectively and electrically connected with the first switch module and the first voltage division module, and the first voltage division module is accessed to an adapter power supply signal;
the first switch module selects to access the power supply load power supply signal or the adapter power supply signal according to the short-circuit state of the power supply load power supply signal and adjusts a switch control signal output to the second switch module according to the accessed signal, and the second switch module selects to access the switch control signal or a voltage division signal output by the first voltage division module and adjusts an output enable signal according to the accessed signal; the enabling signal is used for controlling the on-off of a power supply line from the power supply load power supply signal to the power supply load.
Optionally, the power supply short-circuit protection circuit of the electronic device further includes:
the adapter power supply module comprises a third resistor, a fourth resistor, a third switch, a fifth resistor and a sixth resistor;
the first end of the third resistor is connected to the adapter power supply signal, the second end of the third resistor and the first end of the fourth resistor are electrically connected to the control end of the third switch, the second end of the fourth resistor is grounded, the first end of the third switch is electrically connected to the first end of the fifth resistor, the second end of the third switch is grounded, the second end of the fifth resistor is electrically connected to the first end of the sixth resistor and the control end of the first switch module, and the second end of the sixth resistor outputs a charge-discharge control starting signal.
Optionally, the power supply short-circuit protection circuit of the electronic device further includes:
the protection module comprises a fourth switch, the control end of the fourth switch is connected to the power supply signal of the power load, the first end of the fourth switch is electrically connected with the control end of the third switch, and the second end of the fourth switch is grounded.
Optionally, the power supply short-circuit protection circuit of the electronic device further includes:
the power supply module comprises a first unidirectional conduction element and a seventh resistor;
the anode of the first unidirectional conducting element is electrically connected with the control end of the first switch module, the cathode of the first unidirectional conducting element is electrically connected with the first end of the seventh resistor, and the second end of the seventh resistor is connected to the power supply signal of the power load.
Optionally, the first switch module comprises:
the control end of the first switch is selectively connected to the power supply signal of the power supply load or the power supply signal of the adapter, the first end of the first switch is electrically connected with the control end of the second switch module, and the second end of the first switch is grounded.
Optionally, the second switch module comprises:
and the control end of the second switch module is respectively and electrically connected with the first switch module and the first voltage division module, the first end of the second switch outputs the enable signal, and the second end of the second switch is grounded.
Optionally, the first pressure splitting module comprises:
the first end of the first resistor is connected to the adapter power supply signal, the second end of the first resistor is electrically connected with the first end of the second resistor, and the second end of the second resistor is grounded.
Optionally, the power supply short-circuit protection circuit of the electronic device further includes:
the correction module comprises a fifth switch and an eighth resistor, the control end of the fifth switch is electrically connected with the control end of the second switch module, the first end of the fifth switch is electrically connected with the first end of the eighth resistor, the second end of the eighth resistor is electrically connected with the control end of the first switch module, and the second end of the fifth switch is grounded.
Optionally, the power supply short-circuit protection circuit of the electronic device further includes:
the time delay module comprises a ninth resistor and a first capacitor, the first end of the ninth resistor is electrically connected with the control end of the second switch control module, the second end of the ninth resistor is electrically connected with the first end of the first capacitor and the control end of the fifth switch, and the second end of the first capacitor is grounded.
In a second aspect, an embodiment of the present disclosure further provides an electronic device, including the power supply short-circuit protection circuit of the electronic device according to the first aspect.
Compared with the prior art, the technical scheme provided by the disclosure has the following advantages:
the power supply short-circuit protection circuit for the electronic equipment comprises a first switch module, a second switch module and a first voltage division module; the second switch module is respectively and electrically connected with the first switch module and the first voltage division module, and the first voltage division module is connected with an adapter power supply signal; the first switch module selects to access a power supply load power supply signal or an adapter power supply signal according to the short-circuit state of the power supply load power supply signal and adjusts a switch control signal output to the second switch module according to the accessed signal, and the second switch module selects to access the switch control signal or a voltage division signal output by the first voltage division module and adjusts an output enable signal according to the accessed signal; the enabling signal is used for controlling the on-off of a power supply circuit from a power supply load power supply signal to the power supply load. Therefore, when the power supply signal of the power load is in a short-circuit state, the first module is in a disconnection state, the second switch module outputs a low-level enabling signal, a power supply line between the power supply signal of the power load and the power load is disconnected, the power load is prevented from being burnt when the power supply end of the power load is short-circuited, damage to the electronic equipment and the adapter is avoided, the hot melting phenomenon is avoided, and the safety of the electronic equipment is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the embodiments or technical solutions in the prior art description will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a power supply short-circuit protection circuit of an electronic device according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a power-up timing sequence of a power supply short-circuit protection circuit of an electronic device according to an embodiment of the disclosure;
fig. 3 is a schematic diagram of a power-up sequence of a power short protection circuit of another electronic device according to an embodiment of the disclosure;
fig. 4 is a schematic diagram of a power-down timing sequence of a power supply short-circuit protection circuit of an electronic device according to an embodiment of the present disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
Fig. 1 is a schematic structural diagram of a power supply short-circuit protection circuit of an electronic device according to an embodiment of the present disclosure. As shown in fig. 1, the power supply short-circuit protection circuit of the electronic device includes a first switch module 1, a second switch module 2, and a first voltage division module 3; the second switch module 2 is respectively and electrically connected with the first switch module 1 and the first voltage division module 3, and the first voltage division module 3 is connected with an adapter power supply signal AC _ IN; the first switch module 1 selects to access a power load power supply signal V _ DC or an adapter power supply signal AC _ IN according to the short-circuit state of the power load power supply signal V _ DC and adjusts a switch control signal output to the second switch module 2 according to the accessed signal, and the second switch module 2 selects to access a switch control signal or a voltage division signal output by the first voltage division module 3 and adjusts an output enable signal AC _ IN _ EN according to the accessed signal; the enable signal AC _ IN _ EN is used for controlling the on-off of a power supply line from the power supply load power supply signal V _ DC to the power supply load.
Specifically, as shown IN fig. 1, when the power supply signal V _ DC is IN a short-circuit state, the first switch module 1 is connected to the adapter power supply signal AC _ IN, the voltage of the adapter power supply signal AC _ IN cannot reach the on-state voltage of the first switch module 1 due to the short-circuit effect of the power supply signal V _ DC, the first switch module 1 is IN an off state, the second switch module 2 is connected to the voltage division signal output by the first voltage division module 3, the voltage division signal controls the low level enable signal AC _ IN _ EN output by the second switch module 2, and the low level enable signal AC _ IN _ EN controls the power supply line between the power supply signal V _ DC and the power supply load to be disconnected. When the power supply signal V _ DC of the power load is IN a normal state, the first switch module 1 is connected to the power supply signal V _ DC of the power load, the first switch module 1 is IN a conducting state and outputs a low-level switch control signal to the second switch module 2, the second switch module 2 outputs a high-level enable signal AC _ IN _ EN, and the high-level enable signal AC _ IN _ EN controls the conduction of a power supply line from the power supply signal V _ DC of the power load to the power load.
The second switch module 2 is arranged to be respectively electrically connected with the first switch module 1 and the first voltage division module 3, when a power supply signal V _ DC of a power load is IN a short-circuit state, the first switch module 1 is IN a disconnection state, the second switch module 2 is connected into a voltage division signal output by the first voltage division module 3 and outputs a low level enable signal AC _ IN _ EN, a power supply line between the power supply signal V _ DC of the power load and the power load is disconnected, the power load is prevented from being burnt when a short circuit occurs at a power supply end of the power load, damage is caused to electronic equipment and an adapter, the occurrence of a hot melting phenomenon is avoided, and the safety of the electronic equipment is improved.
Optionally, as shown in fig. 1, the power supply short-circuit protection circuit of the electronic device further includes: the adapter power supply module 4 comprises a third resistor R3, a fourth resistor R4, a third switch T3, a fifth resistor R5 and a sixth resistor R6; the first end H5 of the third resistor is connected to the adapter power supply signal AC _ IN, the second end H6 of the third resistor and the first end H7 of the fourth resistor are both electrically connected to the control end G3 of the third switch, the second end H8 of the fourth resistor is grounded, the first end D3 of the third switch is electrically connected to the first end H9 of the fifth resistor, the second end S3 of the third switch is grounded, the second end H10 of the fifth resistor is electrically connected to the first end H11 of the sixth resistor and the control end of the first switch module 1, and the second H12 of the sixth resistor outputs a control charge-discharge start signal REGN.
Specifically, as shown IN fig. 1, the first end H5 of the third resistor is connected to the adapter power supply signal AC _ IN, the voltage value of the adapter power supply signal AC _ IN is, for example, 20V, the voltage of the adapter power supply signal AC _ IN reaches the on voltage of the control end G3 of the third switch after being divided by the third resistor R3 and the fourth resistor R4, the charge and discharge control start signal REGN is output after the third switch T3 is turned on and passes through the fifth resistor R5 and the sixth resistor R6, the voltage of the charge and discharge control start signal REGN may be, for example, 5V, and the charge and discharge control start signal REGN may be used to supply power to a charge and discharge control chip inside the electronic device, thereby completing self-starting.
Optionally, as shown in fig. 1, the power supply short-circuit protection circuit of the electronic device further includes: the protection module 5 includes a fourth switch T4, a control terminal G4 of the fourth switch is connected to the power supply signal V _ DC, a first terminal D4 of the fourth switch is electrically connected to the control terminal G3 of the third switch, and a second terminal S4 of the fourth switch is grounded.
Specifically, as shown IN fig. 1, after the charge and discharge control start signal REGN powers the charge and discharge control chip inside the electronic device and the self-start is completed, the power supply signal V _ DC is IN a normal state, and when the power supply signal V _ DC can normally supply power to the power supply, and a high-level signal of the power supply signal V _ DC reaches an on voltage of the control terminal G4 of the fourth switch, the fourth switch T4 is turned on, the voltage of the control terminal G3 of the third switch is pulled low, and the third switch T3 is IN an off state, at this time, a line between the adapter power supply signal AC _ IN and the charge and discharge control start signal REGN is disconnected, so as to reduce a leakage current at the charge and discharge control start signal REGN.
Optionally, as shown in fig. 1, the power supply short-circuit protection circuit of the electronic device further includes: the power load power supply module 6, the power load power supply module 6 includes a first unidirectional conducting element N1 and a seventh resistor R7; the anode of the first unidirectional conducting element N1 is electrically connected to the control terminal of the first switch module 1, the cathode of the first unidirectional conducting element N1 is electrically connected to the first terminal H13 of the seventh resistor, and the second terminal H14 of the seventh resistor is connected to the power supply signal V _ DC.
Specifically, as shown in fig. 1, the first unidirectional conducting element N1 may be, for example, a diode, and by using the unidirectional conductivity of the diode, current may normally flow from the adapter end to the voltage load power supply end, so as to avoid the voltage load power supply end from generating reverse current to burn out the circuit. In addition, the seventh resistor R7 is used as a current-limiting resistor for limiting the current flowing into the power supply end of the power load, so that the power load is prevented from being burnt by overlarge current, and the power supply safety is improved.
Alternatively, as shown in fig. 1, the first switch module 1 includes: the control terminal G1 of the first switch T1 is selectively connected to the power supply signal V _ DC or the adapter power supply signal AC _ IN, the first terminal D1 of the first switch is electrically connected to the control terminal of the second switch module 2, and the second terminal S1 of the first switch is grounded.
Specifically, as shown in fig. 1, the first switch T1 may be, for example, a metal oxide semiconductor field effect transistor, a gate of the metal oxide semiconductor field effect transistor may be provided as the control terminal G1 of the first switch, a source of the metal oxide semiconductor field effect transistor may be provided as the second terminal S1 of the first switch, and a drain of the metal oxide semiconductor field effect transistor may be provided as the first terminal D1 of the first switch.
Illustratively, when the power load power supply signal V _ DC is IN a short-circuit state, the control terminal G1 of the first switch is connected to the adapter power supply signal AC _ IN, the voltage of the adapter power supply signal AC _ IN cannot reach the on-state voltage of the first switch T1 under the influence of the short-circuit of the power load power supply signal V _ DC, the first switch T1 is IN an off state, the second switch module 2 is connected to the divided voltage signal output by the first divided voltage module 3, the second switch module 2 outputs the low-level enable signal AC _ IN _ EN, and the low-level enable signal AC _ IN _ EN controls the power supply line between the power load power supply signal V _ DC and the power load to be disconnected; when the power supply signal V _ DC of the power load is IN a normal state, the control terminal G1 of the first switch is connected to the power supply signal V _ DC of the power load, the first switch T1 is IN a conducting state and outputs a low-level switch control signal to the second switch module 2, the second switch module 2 is connected to the low-level switch control signal and outputs a high-level enable signal AC _ IN _ EN, and the high-level enable signal AC _ IN _ EN controls the power supply line between the power supply signal V _ DC of the power load and the power load to be conducted.
Alternatively, as shown in fig. 1, the second switch module 2 includes: a second switch T2, a control terminal G2 of which is electrically connected to the first switch module 1 and the first voltage division module 3, respectively, a first terminal D2 of which outputs an enable signal AC _ IN _ EN, and a second terminal S2 of which is grounded.
Specifically, as shown in fig. 1, the second switch T2 may be, for example, a metal oxide semiconductor field effect transistor, a gate of the metal oxide semiconductor field effect transistor may be provided as the control terminal G2 of the second switch, a source of the metal oxide semiconductor field effect transistor may be provided as the second terminal S2 of the second switch, and a drain of the metal oxide semiconductor field effect transistor may be provided as the first terminal D2 of the second switch.
Illustratively, when the power supply signal V _ DC of the power load is IN a short-circuit state, the control terminal G2 of the second switch selects to access the voltage-dividing signal output by the first voltage-dividing module 3, the first terminal D2 of the second switch outputs a low-level enable signal AC _ IN _ EN, and the low-level enable signal AC _ IN _ EN controls the power supply line between the power supply signal V _ DC of the power load and the power load to be disconnected, so as to avoid burning the power load when the power supply terminal of the power load is IN a short-circuit state; when the power supply signal V _ DC of the power load is IN a normal state, the control terminal G2 of the second switch selects to access the low level switch control signal output by the first switch module 1, the first terminal D2 of the second switch outputs a high level enable signal AC _ IN _ EN, and the high level enable signal AC _ IN _ EN controls the conduction of the power supply line from the power supply signal V _ DC of the power load to the power load.
Optionally, the first pressure division module 3 comprises: the adapter power supply circuit comprises a first resistor R1 and a second resistor R2, wherein a first end H1 of the first resistor is connected to an adapter power supply signal AC _ IN, a second end H2 of the first resistor and a first end H3 of the second resistor are both electrically connected with a control end G2 of the second switch, and a second end H4 of the second resistor is grounded.
Specifically, as shown IN fig. 1, the voltage of the adapter power supply signal AC _ IN connected to the first terminal H1 of the first resistor is still higher than the on-state voltage of the control terminal G2 of the second switch, and IN order to avoid the excessively high voltage from damaging the second switch T2, the first resistor R1 and the second resistor R2 may be provided as the first voltage division module 3 to reduce the voltage of the adapter power supply signal AC _ IN, so that the voltage output to the control terminal G2 of the second switch reaches the on-state voltage of the control terminal G2 of the second switch. Illustratively, when the voltage of the adapter power supply signal AC _ IN is 20V, the turn-on voltage of the control terminal G2 of the second switch is 8V, and after the voltage is divided by the first resistor R1 and the second resistor R2, the voltage applied to the control terminal G2 of the second switch is 8V, at this time, the second switch T2 may be turned on, so that the second switch T2 is prevented from being damaged when the voltage of the control terminal G2 of the second switch is too high. It should be noted that, the resistances of the first resistor R1 and the second resistor R2 may be set according to the on-voltage of the second switch T2, which is not limited in the embodiment of the disclosure.
Optionally, as shown in fig. 1, the power supply short-circuit protection circuit of the electronic device further includes: and the correction module 7, wherein the correction module 7 includes a fifth switch T5 and an eighth resistor R8, a control terminal G5 of the fifth switch is electrically connected with a control terminal G2 of the second switch T2, a first terminal D5 of the fifth switch is electrically connected with a first terminal H15 of the eighth resistor, a second terminal H16 of the eighth resistor is electrically connected with a control terminal of the first switch module 1, and a second terminal S5 of the fifth switch is grounded.
Specifically, as shown IN fig. 1, when the power supply signal V _ DC of the power supply load is IN a micro short circuit state, the voltage of the control end of the first switch module 1 is at a critical voltage for turning on the first switch module 1, and at this time, the first switch module 1 may be at an edge of turning on and off, which may cause the enable signal AC _ IN _ EN to frequently switch between a high level signal and a low level signal to damage the electronic device. In order to solve the problem, the embodiment of the disclosure provides a fifth switch T5 and an eighth resistor R8 as the correction module 7, when the power supply signal V _ DC is in a micro short-circuit state, at this time, the voltage of the control terminal of the first switch module 1 is in a critical state of turning on and conducting, the control terminal G5 of the fifth switch is electrically connected to the control terminal of the second switch module 2, the fifth switch T5 is in a conducting state, the second terminal H16 of the eighth resistor is electrically connected to the control terminal of the first switch module 1, and a parallel circuit formed by the fifth switch T5 and the eighth resistor R8 is used to pull down the voltage of the control terminal of the first switch module 1, for example, the voltage of the control terminal of the first switch module 1 can be reduced by about 100mV compared with the critical conducting voltage of the control terminal of the first switch module 1, so that the first switch module 1 is still in a closed state, thereby realizing correction of the voltage of the control terminal of the first switch module 1, frequent switching on and off of the first switching module 1 is avoided.
Optionally, as shown in fig. 1, the power supply short-circuit protection circuit of the electronic device further includes: the delay module 8, the delay module 8 includes a ninth resistor R9 and a first capacitor C1, a first end H17 of the ninth resistor is electrically connected to the control end of the second switch module 2, a second end H18 of the ninth resistor is electrically connected to a first end E1 of the first capacitor and a control end G5 of the fifth switch, and a second end E2 of the first capacitor is grounded.
Specifically, as shown in fig. 1, a ninth resistor R9 and a first capacitor C1 may be used as a delay circuit of the fifth switch T5, the ninth resistor R9 and the first capacitor C1 are connected in series, a first end H17 of the ninth resistor is electrically connected to the control end of the second switch module 2, the first capacitor C1 is charged through the ninth resistor R9, after the voltage of the first end E1 of the first capacitor slowly rises until reaching the on-voltage of the control end G5 of the fifth switch, the fifth switch T5 is controlled to be turned on, and the time for charging the first capacitor C1 is used as the delay time for turning on the fifth switch T5. It should be noted that the capacitance value of the first capacitor C1 and the resistance value of the ninth resistor R9 may be set according to a delay time required by a power short protection circuit of the electronic device, which is not limited in the embodiment of the disclosure.
Optionally, as shown in fig. 1, the power supply short-circuit protection circuit of the electronic device further includes: the second voltage division module 9 comprises a tenth resistor R10 and an eleventh resistor R11, a first end H19 of the tenth resistor is connected to a power supply load power supply signal V _ DC, a second end H20 of the tenth resistor, a first end H21 of the eleventh resistor and a first end E3 of the second capacitor are electrically connected to a control end G4 of the fourth switch, and a second end H22 of the eleventh resistor and a second end E4 of the second capacitor are grounded.
Specifically, as shown in fig. 1, the power supply short-circuit protection circuit of the electronic device may further include a second voltage dividing module 9 and a second capacitor C2, and when the voltage of the power supply load supply signal V _ DC is still higher relative to the on-state voltage of the control terminal G4 of the fourth switch, in order to avoid the excessively high voltage from damaging the fourth switch T4, a tenth resistor R10 and an eleventh resistor R11 may be provided as the second voltage dividing module 9, so that the voltage output to the control terminal G4 of the fourth switch reaches the on-state voltage of the control terminal G4 of the fourth switch. Illustratively, when the voltage of the power source load supply signal V _ DC is 20V, for example, the on-state voltage of the control terminal G4 of the fourth switch is 8V, and after the voltage of the power source load supply signal V _ DC passes through the tenth resistor R10 and the eleventh resistor R11, the voltage applied to the control terminal G4 of the fourth switch is 8V, at which time the fourth switch T4 may be turned on, so as to avoid the damage of the excessive voltage to the fourth switch T4.
In addition, abnormal electrical signals such as high-frequency signals or noise signals may exist in the electrical signals at the output end of the second voltage division module 9, and if the abnormal electrical signals are output to the fourth switch T4, the fourth switch T4 may be interfered with conduction, so that the second capacitor C2 is arranged in the embodiment of the disclosure to filter the abnormal signals in the second voltage division module 9, and the stability of the power supply short-circuit protection circuit of the electronic device is improved.
Fig. 2 is a schematic diagram of a power-on sequence of a power short protection circuit of an electronic device according to an embodiment of the present disclosure, where an abscissa IN fig. 2 is time, and a unit is ms (millisecond), and with reference to fig. 1 and fig. 2, when a power supply signal V _ DC of a power load is IN a normal state, after an adapter power supply signal AC _ IN is accessed, and after voltage division is performed by a third resistor R3 and a fourth resistor R4, a signal T3_ G of a control terminal G3 of a third switch is a high-level signal, a third switch T3 is turned on, a charge and discharge control start signal REGN is output, a voltage of a control terminal G1 of a first switch is a voltage of a charge and discharge control start signal REGN after voltage division is performed by a fifth resistor R5 and a sixth resistor R6, when a signal T1_ G of a control terminal G1 of the first switch is a high-level signal, the first switch T1 is turned on, a voltage of a control terminal G2 of a second switch is pulled down, and a second switch T2 outputs an EN _ IN enable signal, and controlling the conduction of a power supply line between the power supply load power supply signal V _ DC and the power supply load. After the power supply signal V _ DC of the power supply load is normally powered on, the fourth switch T4 is turned on, and the third switch T3 is turned off, thereby reducing the leakage current of the system.
Fig. 3 is a schematic diagram of a power-up sequence of a power supply short-circuit protection circuit of another electronic device according to an embodiment of the disclosure, where an abscissa IN fig. 3 is time IN ms (millisecond), and with reference to fig. 1 and fig. 3, after a power supply signal V _ DC of a power supply load is IN a short-circuit state, an adapter is connected, and after an adapter power supply signal AC _ IN is input, and is divided by a third resistor R3 and a fourth resistor R4, a signal T3_ G of a control terminal G3 of a third switch is a high-level signal, a third switch T3 is turned on, and a charge and discharge control start signal REGN is output, but since the power supply signal V _ DC of the power supply load is a low-level signal at this time, a signal T1_ G of a control terminal G1 of a first switch is a low-level signal, a first switch T1 is IN a closed state, a voltage of the control terminal G2 of a second switch is a voltage of the adapter power supply signal AC _ IN divided by a first voltage dividing module 3, the second switch module 2 outputs a low level enable signal AC _ IN _ EN to control the disconnection of a power supply line from a power supply load power supply signal V _ DC to a power supply load, so that the voltage of the adapter is prevented from being input to the power supply load, secondary damage is avoided, and hot melting is avoided.
Fig. 4 is a schematic diagram of a power-down timing sequence of a power supply short-circuit protection circuit of an electronic device according to an embodiment of the present disclosure, where an abscissa IN fig. 4 is time, and a unit is ms (millisecond), and with reference to fig. 1 and fig. 4, after the electronic device is connected to an adapter, a power supply signal V _ DC of a power load is suddenly IN a short-circuit state, a signal T1_ G of a control terminal G1 of a first switch is a low-level signal, a first switch T1 is turned off, a voltage of a control terminal G2 of a second switch is turned up, and a second switch module 2 outputs a low-level enable signal AC _ IN _ EN, so that a voltage of the adapter is prevented from being input to the power load, secondary damage is avoided, and hot melting is avoided.
The embodiment of the present disclosure further provides an electronic device, where the electronic device includes the power supply short-circuit protection circuit of the electronic device according to the embodiment, and therefore the electronic device provided by the embodiment of the present disclosure has the beneficial effects described in the embodiment. In addition, the electronic device according to the embodiment of the present disclosure may be a computer, a mobile phone, or the like, and this is not particularly limited in the embodiment of the present disclosure.
It is noted that, in this document, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which will enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A power supply short protection circuit for an electronic device, comprising:
the circuit comprises a first switch module, a second switch module and a first voltage division module; the second switch module is electrically connected with the first switch module and the first voltage division module respectively, and the first voltage division module is connected with an adapter power supply signal;
the first switch module selects to access the power supply load power supply signal or the adapter power supply signal according to the short circuit state of the power supply load power supply signal and adjusts the switch control signal output to the second switch module according to the accessed signal, and the second switch module selects to access the switch control signal or the voltage division signal output by the first voltage division module and adjusts the output enable signal according to the accessed signal; the enabling signal is used for controlling the on-off of a power supply circuit from the power supply load power supply signal to the power supply load.
2. The power supply short-circuit protection circuit of an electronic device according to claim 1, further comprising:
the adapter power supply module comprises a third resistor, a fourth resistor, a third switch, a fifth resistor and a sixth resistor;
the first end of the third resistor is connected to the adapter power supply signal, the second end of the third resistor and the first end of the fourth resistor are electrically connected to the control end of the third switch, the second end of the fourth resistor is grounded, the first end of the third switch is electrically connected to the first end of the fifth resistor, the second end of the third switch is grounded, the second end of the fifth resistor is electrically connected to the first end of the sixth resistor and the control end of the first switch module, and the second end of the sixth resistor outputs a charge-discharge control starting signal.
3. The power supply short-circuit protection circuit of an electronic device according to claim 2, further comprising:
the protection module comprises a fourth switch, the control end of the fourth switch is connected to the power supply signal of the power load, the first end of the fourth switch is electrically connected with the control end of the third switch, and the second end of the fourth switch is grounded.
4. The power supply short-circuit protection circuit of an electronic device according to claim 1, further comprising:
the power supply load power supply module comprises a first one-way conduction element and a seventh resistor;
the anode of the first unidirectional conducting element is electrically connected with the control end of the first switch module, the cathode of the first unidirectional conducting element is electrically connected with the first end of the seventh resistor, and the second end of the seventh resistor is connected to the power supply signal of the power load.
5. The electronic device power supply short-circuit protection circuit according to claim 1, wherein the first switch module comprises:
the control end of the first switch is selectively connected to the power supply signal of the power supply load or the power supply signal of the adapter, the first end of the first switch is electrically connected with the control end of the second switch module, and the second end of the first switch is grounded.
6. The electronic device power supply short-circuit protection circuit according to claim 1, wherein the second switch module comprises:
and the control end of the second switch module is respectively and electrically connected with the first switch module and the first voltage division module, the first end of the second switch outputs the enabling signal, and the second end of the second switch is grounded.
7. The power supply short protection circuit of an electronic device according to claim 1, wherein the first voltage division module comprises:
the first end of the first resistor is connected to the adapter power supply signal, the second end of the first resistor is electrically connected with the first end of the second resistor, and the second end of the second resistor is grounded.
8. The power supply short-circuit protection circuit of an electronic device according to claim 1, further comprising:
the correction module comprises a fifth switch and an eighth resistor, the control end of the fifth switch is electrically connected with the control end of the second switch module, the first end of the fifth switch is electrically connected with the first end of the eighth resistor, the second end of the eighth resistor is electrically connected with the control end of the first switch module, and the second end of the fifth switch is grounded.
9. The power supply short protection circuit of an electronic device according to claim 8, further comprising:
the time delay module comprises a ninth resistor and a first capacitor, the first end of the ninth resistor is electrically connected with the control end of the second switch control module, the second end of the ninth resistor is electrically connected with the first end of the first capacitor and the control end of the fifth switch, and the second end of the first capacitor is grounded.
10. An electronic device, characterized in that: a power supply short-circuit protection circuit comprising an electronic device as claimed in any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220708746.8U CN217063250U (en) | 2022-03-24 | 2022-03-24 | Power supply short-circuit protection circuit of electronic equipment and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220708746.8U CN217063250U (en) | 2022-03-24 | 2022-03-24 | Power supply short-circuit protection circuit of electronic equipment and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN217063250U true CN217063250U (en) | 2022-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220708746.8U Active CN217063250U (en) | 2022-03-24 | 2022-03-24 | Power supply short-circuit protection circuit of electronic equipment and electronic equipment |
Country Status (1)
| Country | Link |
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| CN (1) | CN217063250U (en) |
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2022
- 2022-03-24 CN CN202220708746.8U patent/CN217063250U/en active Active
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