CN206097104U - Hot plug protection circuit and electronic equipment - Google Patents
Hot plug protection circuit and electronic equipment Download PDFInfo
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- CN206097104U CN206097104U CN201620852933.8U CN201620852933U CN206097104U CN 206097104 U CN206097104 U CN 206097104U CN 201620852933 U CN201620852933 U CN 201620852933U CN 206097104 U CN206097104 U CN 206097104U
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- 101100489713 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND1 gene Proteins 0.000 description 30
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The utility model discloses a hot plug protection circuit and electronic equipment, this hot plug protection circuit includes trigger circuit and switch circuit, trigger circuit's power input end is connected with the power output end of power supply unit, trigger circuit's the sense terminal and the ground connection of power supply unit, and trigger circuit's control end is connected with switch circuit's controlled end, and switch circuit's power input end is connected with the power output end of power supply unit, and switch circuit's power output end is connected with the power input end of consumer, the ground wire of power supply unit is connected by the earthing terminal that trigger circuit is used for detecting the consumer whether, switch circuit is based on trigger circuit control to electrical connection is held with the power input of consumer to the power output end of control power supply unit when switching on. The utility model discloses avoided consumer and power supply unit not altogether the time, the power end is connected earlier, and the peak energy of production damages the problem of consumer.
Description
Technical Field
The utility model relates to a hot plug technical field especially relates to a hot plug protection circuit and electronic equipment.
Background
Hot plugging, that is, taking out or inserting an electric board, a hard disk, a memory card, or other devices capable of realizing hot plugging without turning off the power supply of the devices.
At present, the hot plug technology is applied in the product production detection link of industrial production, for example, various electronic appliances are connected between a small external board and a main board, various electronic appliances are connected through small current signals, and the like.
However, in the process of plugging and unplugging the plugging device and the plugged device, there is a risk of damaging the plugging device, and after the plugging device is plugged with the plugged device, power needs to be supplied to the plugged device for operation, so the plugging device is also called as an electrical device, and the plugged device is called as a power supply device. If the power input end of the electrical equipment is still connected with the power output end of the power supply equipment during plugging and unplugging, and the ground wires of the electrical equipment and the power output end of the power supply equipment are not connected in common, peak current or peak voltage exceeding the bearing capacity of the electrical equipment can be generated, and the electrical equipment can be damaged.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides a hot plug protection circuit and electronic equipment, aims at solving the problem that overvoltage or overcurrent and damage consumer appear easily among the electronic equipment hot plug process, improves consumer's protective capacities and reliability.
In order to achieve the above object, the present invention provides a hot plug protection circuit, which includes a trigger circuit and a switch circuit; the power supply input end of the trigger circuit is used for being connected with the power supply output end of power supply equipment, the detection end of the trigger circuit is used for being connected with the ground wire of the power supply equipment, the control end of the trigger circuit is connected with the controlled end of the switch circuit, the power supply input end of the switch circuit is used for being connected with the power supply output end of the power supply equipment, and the power supply output end of the switch circuit is used for being connected with the power supply input end of electric equipment; wherein,
the trigger circuit is used for detecting whether the grounding end of the electric equipment is connected with the ground wire of the power supply equipment or not and controlling the on-off of the switch circuit; when the grounding end of the electric equipment is detected to be connected with the ground wire of the power supply equipment, the switching circuit is controlled to be started, and when the grounding end of the electric equipment is detected not to be connected with the ground wire of the power supply equipment, the switching circuit is controlled to be kept in a turn-off state;
the switch circuit is used for controlling the power output end of the power supply equipment to be electrically disconnected with the power input end of the electric equipment when the power supply equipment is turned off, and controlling the power output end of the power supply equipment to be electrically connected with the power input end of the electric equipment when the power supply equipment is turned on.
Preferably, the trigger circuit includes a first triode, a first resistor, a second resistor and a third resistor, a first end of the first resistor is connected to the power output terminal of the power supply device, and a second end of the first resistor is connected to the ground line of the power supply device through the second resistor; the public end of the first resistor and the second resistor is connected with the base electrode of the first triode, the collector electrode of the first triode passes through the third resistor and is connected with the controlled end of the switch circuit, the emitter electrode of the first triode is the ground wire connecting end of the hot plug protection circuit and is used for passing through the grounding end of the electric equipment and being connected with the ground wire of the power supply equipment.
Preferably, the switch circuit includes an MOS transistor and a fifth resistor, a gate of the MOS transistor is a controlled end of the switch circuit, a source of the MOS transistor is a power input end of the switch circuit, and a drain of the MOS transistor is a power output end of the switch circuit; the fifth resistor is connected between the source electrode and the grid electrode of the MOS tube in parallel.
Preferably, the MOS tube is a P-MOS tube.
Preferably, the hot plug protection circuit further includes a first delay circuit, the first delay circuit includes a first capacitor and a fourth resistor, a first end of the first capacitor is connected to the power output end of the switch circuit and the common end of the power input end of the electrical equipment, a second end of the first capacitor is connected to a first end of the fourth resistor, and a second end of the fourth resistor is connected to the ground of the electrical equipment through the ground of the electrical equipment.
Preferably, the trigger circuit includes a second triode, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor, a first end of the sixth resistor is connected to the power output end of the power supply device, and a second end of the seventh resistor is connected to the ground wire of the power supply device through the eighth resistor; and the common end of the seventh resistor and the eighth resistor is connected with the base electrode of the second triode, the collector electrode of the second triode is connected with the power output end of the power supply equipment through the ninth resistor, and the emitter electrode of the second triode is connected with the controlled end of the switching circuit through the tenth resistor.
Preferably, switch circuit includes the switch chip, the switch chip includes power input foot, power output foot, enables input foot and ground connection foot, the enable input foot of switch chip with drive circuit's control end is connected, the power input foot of switch chip with power supply unit's power output end is connected, the power output foot of switch chip with power input unit's connection, the ground connection foot of switch chip does hot plug protection circuit's ground wire link is used for the warp the grounding end of consumer with power supply unit's ground wire is connected.
Preferably, the hot plug protection circuit further includes a second delay circuit, the second delay circuit includes a second capacitor and an eleventh resistor, a first end of the second capacitor is interconnected with a first end of the eleventh resistor, a control end of the trigger circuit and a controlled end of the switch circuit, and a second end of the second capacitor is connected with a second end of the eleventh resistor and connected with a ground pin of the power switch chip.
The utility model also provides an electronic device, which comprises the hot plug protection circuit, wherein the hot plug protection circuit comprises a trigger circuit and a switch circuit; the power supply input end of the trigger circuit is used for being connected with the power supply output end of power supply equipment, the detection end of the trigger circuit is used for being connected with the ground wire of the power supply equipment, the control end of the trigger circuit is connected with the controlled end of the switch circuit, the power supply input end of the switch circuit is used for being connected with the power supply output end of the power supply equipment, and the power supply output end of the switch circuit is used for being connected with the power supply input end of electric equipment; the trigger circuit is used for detecting whether the grounding end of the electric equipment is connected with the ground wire of the power supply equipment or not; when the grounding end of the electric equipment is detected to be connected with the ground wire of the power supply equipment, the switching circuit is controlled to be started, and when the grounding end of the electric equipment is detected not to be connected with the ground wire of the power supply equipment, the switching circuit is controlled to be kept in a turn-off state; the switch circuit is used for controlling the power output end of the power supply equipment to be electrically disconnected with the power input end of the electric equipment when the power supply equipment is turned off, and controlling the power output end of the power supply equipment to be electrically connected with the power input end of the electric equipment when the power supply equipment is turned on.
The utility model discloses a set up the hot plug protection circuit and protect equipment at the in-process of hot plug in electronic equipment to avoid the problem that overvoltage or overcurrent and damage consumer appear easily in the electronic equipment hot plug in-process, improve consumer's protective capacities and reliability. Specifically, when the hot plug protection circuit detects that the grounding end of the electric equipment is connected to the ground wire of the power supply equipment through the trigger circuit, the switch circuit is controlled to be switched on, so that the power supply output end of the power supply equipment is controlled to be electrically connected with the power supply input end of the electric equipment, and a working power supply is provided. Like this, avoided the power input end of consumer to be connected earlier with power supply unit's power output end, and when the ground wire was not interconnect, produced the spike voltage or the spike current that surpass consumer self endurance, caused the problem of consumer's damage, so, just improved consumer's protective capacities and reliability.
Drawings
Fig. 1 is a schematic diagram of functional modules of the hot plug protection circuit applied to an electronic device according to the present invention;
FIG. 2 is a circuit diagram illustrating a first embodiment of the hot swap protection circuit shown in FIG. 1;
fig. 3 is a schematic circuit structure diagram of a second embodiment of the hot plug protection circuit shown in fig. 1.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) | Reference numerals | Name (R) |
| 10 | Power supply equipment | Q2 | Second triode | R7 | Seventh resistor |
| 20 | Hot plug protection circuit | QW1 | MOS tube | R8 | Eighth resistor |
| 30 | Electric equipment | IC1 | Power switch chip | R9 | Ninth resistor |
| 21 | Trigger circuit | R1 | A first resistor | R10 | Tenth resistor |
| 22 | Switching circuit | R2 | Second resistance | R11 | Eleventh resistor |
| 23 | First time delay circuit | R3 | Third resistance | C1 | First capacitor |
| 23’ | Second delay circuit | R4 | Fourth resistor | C2 | Second capacitor |
| Q1 | A first triode | R5 | Fifth resistor |
The objects, features and advantages of the present invention will be realized by the embodiments and will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a hot plug protection circuit.
Referring to fig. 1, the hot swap protection circuit 20 includes a trigger circuit 21 and a switch circuit 22.
Specifically, the power input end of the trigger circuit 21 is connected to the power output end VI of the power supply device 10, the detection end of the trigger circuit 21 is connected to the ground GND1 of the power supply device 10, the control end of the trigger circuit 21 is connected to the controlled end of the switch circuit 22, the power input end of the switch circuit 22 is connected to the power output end VI of the power supply device 10, and the power output end of the switch circuit 22 is connected to the power input end VO of the power consumption device 30.
The trigger circuit 21 is configured to detect whether the ground terminal GND3 of the electric device 30 is connected to the ground terminal GND1 of the power supply device 10, and control the switch circuit 22 to be turned on or off; when the grounding end GND3 of the electric equipment 30 is detected to be connected with the grounding end GND1 of the power supply equipment 10, the switch circuit 22 is controlled to be turned on, and when the grounding end GND3 of the electric equipment 30 is detected not to be connected with the grounding end GND1 of the power supply equipment 10, the switch circuit 22 is controlled to be kept in a turn-off state; the switch circuit 22 is configured to control the power output VI of the power supply device 10 to be electrically disconnected from the power input VO of the electrical device 30 when the power supply device is turned off; when the power supply device is turned on, the power output end VI of the power supply device 10 is controlled to be electrically connected with the power input end VO of the power consumption device 30.
When the detection terminal of the trigger circuit 21 detects that the ground terminal GND3 of the electric device 30 is not connected to the ground GND1 of the power supply device 10, the switch circuit 22 is not turned on, and the power input terminal VO of the electric device 30 is not connected to the power output terminal VI of the power supply device 10.
When the detection end of the trigger circuit 21 detects that the ground end GND3 of the electric device 30 is connected to the ground line GND1 of the power supply device 10, the control end of the trigger circuit 21 outputs a driving signal to the switch circuit 22 to drive the switch circuit 22 to be turned on, so as to control the electrical connection between the power output end VI of the power supply device 10 and the power input end VO of the electric device 30 to provide a working power supply. Therefore, the power input end VO of the electric equipment 30 is connected with the power output end VI of the power supply equipment 10, and when the ground wire is not connected in common, a spike voltage or a spike current exceeding the tolerance of the electric equipment 30 itself is generated, so that the electric equipment 30 is prevented from being damaged, and the protection capability and the reliability of the electric equipment 30 are improved.
It is understood that the circuit of the hot swap protection circuit 20 is simple and easy to implement, so the hot swap protection circuit 20 may be disposed in the power supply device 10 or in the electrical device 30, and may also be disposed as a separate adapter to connect the power supply device 10 and the electrical device 30, which is not limited herein.
Referring to fig. 2, fig. 2 shows a specific circuit structure of a first embodiment of the hot plug protection circuit 20 of the present invention, in this first embodiment, the trigger circuit 21 includes a first transistor Q1, a first resistor R1, a second resistor R2 and a third resistor R3, a first end of the first resistor R1 is connected to the power output end VI of the power supply device 10, a second end of the first resistor R1 is connected to the ground GND1 of the power supply device 10 through the second resistor R2, and a common end of the first resistor R1 and the second resistor R2 is connected to the base of the first transistor Q1; the collector of the first triode Q1 is connected to the controlled terminal of the switch circuit 22 through the third resistor R3, and the emitter of the first triode Q1 is the ground connection terminal GND2 of the hot plug protection circuit 20, and is used for being connected to the ground GND1 of the power supply device 10 through the ground terminal GND3 of the power consumption device 30.
The first resistor R1 and the second resistor R2 provide a conducting voltage for the first triode Q1 by serially dividing voltage, the second end of the fourth resistor R4 is a ground connection GND2 of the hot plug protection circuit 20, and is used for being connected with a ground GND1 of the power supply device 10 through a ground terminal GND3 of the power consumption device 30, so as to determine whether the ground terminal GND3 of the power consumption device 30 is connected with the ground GND1 of the power supply device 10, when the ground terminal GND3 of the power consumption device 30 is not connected with the ground GND1 of the power supply device 10, the ground connection GND2 of the hot plug protection circuit 20 is connected with the ground GND1 of the power supply device 10 through the ground terminal GND3 of the power consumption device 30, and at this time, the ground connection GND2 of the trigger circuit 21 is suspended, so that the first triode Q1 is not conductive.
When the ground terminal GND3 of the electric device 30 is connected to the ground terminal GND1 of the power supply device 10, the ground terminal GND2 of the hot swap protection circuit 20 is connected to the ground terminal GND1 of the power supply device 10 through the ground terminal GND3 of the electric device 30, and at this time, the first resistor R1 and the second resistor R2 divide voltage through series connection to trigger the first transistor Q1 to be turned on.
In the first embodiment, the switch circuit 22 includes a MOS transistor QW1 and a fifth resistor R5, a gate of the MOS transistor QW1 is a controlled terminal of the switch circuit 22 and is connected to the control terminal of the trigger circuit 21, a source of the MOS transistor QW1 is a power input terminal of the switch circuit 22 and is connected to the power output terminal VI of the power supply device 10, and a drain of the MOS transistor QW1 is a power output terminal of the switch circuit 22 and is connected to the power input terminal VO of the power consumption device 30; the fifth resistor R5 is connected between the source and the gate of the MOS transistor QW 1.
In this embodiment, the MOS transistor QW1 preferably employs a P-MOS transistor QW1, which has a large logic swing, a long charging and discharging process of an inter-electrode capacitor therein, and a small transconductance, so that the operating speed is low, the on speed is slow, and an excessive current generated when the power input terminal VO of the consumer 30 is connected to the power output terminal VI of the power supply device 10 can be avoided. The fifth resistor R5 is used to provide bias voltage for the gate and source of the MOS transistor QW1, and also used to release the gate charge, so as to prevent the gate-source oxide layer from breaking down after overvoltage is generated between the gate and source after the charge accumulation, and the MOS transistor QW1 is damaged.
The switch circuit 22 is controlled by the trigger circuit 21, the gate of the MOS transistor QW1 is connected to the first transistor Q1 of the trigger circuit 21 through the third resistor R5, when the first transistor Q1 is turned on, the voltage of the gate of the MOS transistor QW1 is pulled low, so that the MOS transistor QW1 is triggered to be turned on, and after the first transistor Q1 is turned on, the gate and the drain of the MOS transistor QW1 are equivalent to a switch, so that the power output terminal VI of the power supply device 10 is electrically connected to the power input terminal VO of the power consumption device 30, and a working power is provided. Meanwhile, due to the limitation of the threshold voltage between the drain and the source of the MOS transistor QW1, the peak voltage and the peak current are not generated at the moment when the power supply device 10 is electrically connected to the electric device 30, and the protection capability and the reliability of the electric device 30 are improved.
Based on the above embodiment, the hot swap protection circuit 20 further includes a first delay circuit 23, the first delay circuit 23 includes a first capacitor C1 and a fourth resistor R4, a first end of the first capacitor C1 is connected to the common terminal of the power output terminal of the switch circuit 22 and the power input terminal VO of the power consumption device 30, a second end of the first capacitor C1 is connected to a first end of the fourth resistor R4, and a second end of the fourth resistor R4 is a ground connection terminal GND2 of the hot swap protection circuit 20.
The first capacitor C1 and the fourth resistor R4 form an RC delay circuit, and the first capacitor C1 and the fourth resistor R4 act to slow the rising speed of the current flowing through the electric device 30, thereby avoiding the generation of a peak current and the damage to the electric device 30.
With reference to fig. 1 and fig. 2, a detailed description is given of a specific circuit principle of the first embodiment of the hot swap protection circuit 20:
when the hot swap protection circuit 20 is installed in the power supply device 10, the ground connection GND2 of the hot swap protection circuit 20 is not actually grounded, which is equivalent to a floating ground, and during the hot swap process, the ground connection GND2 of the hot swap protection circuit 20 is first connected to the ground terminal GND3 of the power consumption device 30, and then is connected to the ground GND1 of the power supply device 10 through the ground terminal GND3 of the power consumption device 30.
When the hot plug protection circuit 20 is disposed in the electric device 30, the ground connection terminal GND2 of the hot plug protection circuit 20 is connected to the ground terminal GND3 of the electric device 30 in advance, and during the hot plug process, the ground terminal GND1 of the power supply device 10 is connected to the ground terminal GND3 of the electric device 30, and then connected to the ground connection terminal GND2 of the hot plug protection circuit 20.
When the hot swap protection circuit 20 is configured as an independent adapter to connect the power supply device 10 and the electrical device 30, the ground terminal GND2 of the hot swap protection circuit 20 is connected to the ground terminal GND1 of the power supply device 10 through the ground terminal GND3 of the electrical device 30.
Specifically, in the hot plug operation, if the power input terminal VO of the electric device 30 and the power output terminal VI of the power supply device are already connected, and the ground terminal GND3 of the electric device 30 is not connected to the ground terminal GND1 of the power supply device 10, the first resistor R1 and the second resistor R2 have no divided voltage output, the first transistor Q1 and the MOS transistor QW1 are both in the off state, that is, the power supply between the electric device 30 and the power supply device 10 is disconnected, and the electric device 30 is not affected by the power supply of the power supply device 10.
When the ground GND3 of the electric device 30 is connected to the ground GND1 of the power supply device 10, the ground connection GND2 of the hot swap protection circuit 20 is grounded through the ground GND1 of the power supply device 10. At this time, the first resistor R1 and the second resistor R2 divide the voltage and output a conducting voltage to the base of the first transistor Q1, so as to provide a bias voltage for the first transistor Q1, and at this time, since the second ground GND2 is grounded through the ground GND1 of the power supply device 10, that is, the emitter of the first transistor Q1 is grounded, the bias voltage triggers the first transistor Q1 to conduct, and after the first transistor Q1 is conducted, the gate voltage of the MOS transistor QW1 connected to the collector of the first transistor Q1 through the third resistor R3 is pulled low to conduct, which is equivalent to turning on the switch circuit 22, so as to control the electrical device 30 connected to the drain of the MOS transistor QW1 and the power supply device 10 connected to the source of the MOS transistor QW1 to electrically connect, so as to provide the operating power supply for the electrical device 30.
In summary, with the hot-plug protection circuit 20 of the present embodiment, the problem that the electrical device 30 is damaged due to the generation of a peak voltage or a peak current exceeding the tolerance of the electrical device 30 itself when the power input terminal VO of the electrical device 30 is connected to the power output terminal VI of the power supply device 10 first and the ground lines are not connected to each other is avoided, so that the protection capability and reliability of the electrical device 30 are improved; in addition, due to the threshold voltage between the drain and the source of the MOS transistor QW1 and the time delay effect of the fifth resistor R5, the problem of spike current or spike voltage generated between the power supply device 10 and the electric equipment 30, which exceeds the tolerance of the electric equipment 30 itself, is further avoided, and the protection capability and reliability of the electric equipment 30 are further improved.
Referring to fig. 3, fig. 3 shows a specific circuit structure of a second embodiment of the hot plug protection circuit 20 of the present invention, in this second embodiment, the trigger circuit 21' includes a second triode Q2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a tenth resistor R10, a first end of the seventh resistor R7 is connected to the power output terminal VI of the power supply device 10, and a second end of the seventh resistor R7 is connected to the ground GND1 of the power supply device 10 through the eighth resistor R8; the common terminal of the seventh resistor R7 and the eighth resistor R8 is connected to the base of the second transistor Q2, the collector of the second transistor Q2 is connected to the power output terminal VI of the power supply apparatus 10 through the ninth resistor R9, and the emitter of the second transistor Q2 is connected to the controlled terminal of the switch circuit 22 through the tenth resistor R10.
The seventh resistor R7 and the eighth resistor R8 are bias resistors of the second triode Q2, so that the second triode Q2 is triggered to be turned on, the tenth resistor R10 is a negative feedback resistor of the second triode Q2, and the seventh resistor R7 and the eighth resistor R8 are used for ensuring that the second triode Q2 is normally turned on, so that the trigger circuit 21' works in a stable state.
In this second embodiment, the switch circuit 22' includes a power switch chip IC1, the power switch chip IC1 includes a power input pin VIN, a power output pin VOUT, an enable input pin EN, and a ground pin GND, the enable input pin EN of the power switch chip IC1 is connected to the control terminal of the driving circuit 22, the power input pin VIN of the power switch chip IC1 is connected to the power output terminal VI of the power supply device 10, the power output pin VOUT of the power switch chip IC1 is connected to the power input terminal VO of the power consumption device 30, and the ground pin GND of the power switch chip IC1 is the ground connection terminal GND2 of the hot plug protection circuit 20, and is connected to the ground GND1 of the power supply device 10 through the ground terminal GND3 of the power consumption device 30. The trigger circuit 22' is controlled by the driving circuit 22, the controlled terminal of the power switch chip IC1 is connected to the second transistor Q2 of the driving circuit 22, when the second transistor Q2 is turned on, the enable input pin EN of the power switch chip IC1 is activated, and the power switch chip IC1 starts to operate, so as to control the power output terminal VI of the power supply device 10 to be electrically connected to the power input terminal VO of the power consumption device 30 to provide an operating power.
Based on the above embodiment, the hot swap protection circuit 20 further includes a second delay circuit 23 ', where the second delay circuit 23 ' includes a second capacitor C2 and an eleventh resistor R11, a first end of the second capacitor C2 is interconnected with a first end of the eleventh resistor R11, a control end of the trigger circuit 21, and a controlled end of the switch circuit 22 ', and a second end of the second capacitor C2 is connected with a second end of the eleventh resistor R11 and connected to the ground pin GND of the power switch chip IC 1.
The eleventh resistor R11 is a delay element, and due to the action of the eleventh resistor R11, the current of the electric device 30 rises slowly, so that the electric device 30 is prevented from being damaged due to spike current.
With reference to fig. 1 and fig. 3, a detailed description is made of a specific circuit principle of the second embodiment of the hot plug protection circuit 20:
when the hot swap protection circuit 20 is installed in the power supply device 10, the ground connection GND2 of the hot swap protection circuit 20 is not actually grounded, which is equivalent to a floating ground, and during the hot swap process, the ground connection GND2 of the hot swap protection circuit 20 is first connected to the ground terminal GND3 of the power consumption device 30, and then connected to the ground GND1 of the power supply device 10 through the ground terminal GND3 of the power consumption device 30.
When the hot plug protection circuit 20 is disposed in the electric device 30, the ground connection GND2 of the hot plug protection circuit 20 is connected to the ground terminal GND3 of the electric device 30 in advance, and during the hot plug process, the ground GND1 of the power supply device 10 is connected to the ground terminal GND3 of the electric device 30, and then connected to the ground connection GND2 of the hot plug protection circuit 20.
When the hot swap protection circuit 20 is configured as an independent adapter to connect the power supply device 10 and the electrical device 30, the ground terminal GND2 of the hot swap protection circuit 20 is connected to the ground terminal GND1 of the power supply device 10 through the ground terminal GND3 of the electrical device 30.
Specifically, in the hot swap operation, if the power output terminal VI of the power supply device 10 and the power input terminal VO of the power consumption device 30 are already connected and the ground terminal GND3 of the power consumption device 30 is not connected to the ground terminal GND1 of the power supply device 10, the ground terminal GND2 of the hot swap protection circuit 20 is not grounded, at this time, the eighth resistor R8 and the seventh resistor R7 have no voltage division signal output, the second transistor Q2 is in the off state, the switching power chip IC1 controlled by the second transistor Q2 does not work, that is, the power supply between the power supply device 30 and the power consumption device 10 is disconnected, and the power consumption device 30 is not affected by the power supply of the power supply device 10.
When the ground GND3 of the electric device 30 is connected to the ground GND1 of the power supply device 10, the ground connection terminal GND2 of the hot plug protection circuit 20 is grounded through the ground GND1 of the power supply device 10. At this time, the eighth resistor R8 and the seventh resistor R7 divide the voltage of the power input by the electric device 30, the eighth resistor R8 and the seventh resistor R7 divide the voltage and output corresponding voltage signals to the base of the second triode Q2, so as to provide a bias voltage for the second triode Q2, and since the ground connection GND2 of the hot swap protection circuit 20 is grounded through the ground GND1 of the power supply device 10, that is, the emitter of the second triode Q2 is grounded, the bias voltage triggers the second triode Q2 to be turned on, and after the second triode Q2 is turned on, the enable input pin EN of the power switch chip IC1 connected with the emitter of the second triode Q2 through the tenth resistor R10 is activated, so that the power switch chip IC1 starts to operate, thereby electrically connecting the power output terminal VI of the power supply device 10 and the power input terminal VO of the electric device 30 to provide a working power.
In summary, with the hot-plug protection circuit 20 of the present embodiment, the problem that the electrical device 30 is damaged due to the generation of a peak voltage or a peak current exceeding the tolerance of the electrical device 30 itself when the power input terminal VO of the electrical device 30 is connected to the power output terminal VI of the power supply device 10 first and the ground lines are not connected to each other is avoided, so that the protection capability and reliability of the electrical device 30 are improved; in addition, due to the delay limitation of the conduction of the power switch chip IC1 and the delay effect of the eleventh resistor R11, the problem that the power consumption device 30 is damaged due to the generation of a peak current or a peak voltage between the power supply device 10 and the power consumption device 30, which exceeds the tolerance capability of the power consumption device 30 itself, is further avoided, and the protection capability and the reliability of the power consumption device 30 are further improved.
It can be understood that, because the utility model discloses above-mentioned hot plug protection circuit has been used among the electronic equipment, consequently, the utility model discloses electronic equipment's embodiment includes all technical scheme of the whole embodiments of above-mentioned hot plug protection circuit, and the technological effect that reaches is also identical, no longer gives details here.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.
Claims (9)
1. A hot plug protection circuit is characterized by comprising a trigger circuit and a switch circuit; the power supply input end of the trigger circuit is used for being connected with the power supply output end of power supply equipment, the detection end of the trigger circuit is used for being connected with the ground wire of the power supply equipment, the control end of the trigger circuit is connected with the controlled end of the switch circuit, the power supply input end of the switch circuit is used for being connected with the power supply output end of the power supply equipment, and the power supply output end of the switch circuit is used for being connected with the power supply input end of electric equipment; wherein,
the trigger circuit is used for detecting whether the grounding end of the electric equipment is connected with the ground wire of the power supply equipment or not and controlling the switch circuit to be switched on or switched off; when the grounding end of the electric equipment is detected to be connected to the ground wire of the power supply equipment, controlling the switch circuit to be switched on; when detecting that the grounding end of the electric equipment is not connected with the ground wire of the power supply equipment, controlling the switch circuit to keep an off state;
the switch circuit is used for controlling the power output end of the power supply equipment to be electrically disconnected with the power input end of the electric equipment when the power supply equipment is turned off, and controlling the power output end of the power supply equipment to be electrically connected with the power input end of the electric equipment when the power supply equipment is turned on.
2. The hot swap protection circuit of claim 1, wherein the trigger circuit comprises a first transistor, a first resistor, a second resistor, and a third resistor, wherein a first end of the first resistor is coupled to the power output of the power supply device, and a second end of the first resistor is coupled to a ground of the power supply device via the second resistor; the public end of the first resistor and the second resistor is connected with the base electrode of the first triode, the collector electrode of the first triode passes through the third resistor and is connected with the controlled end of the switch circuit, the emitter electrode of the first triode is the ground wire connecting end of the hot plug protection circuit and is used for passing through the grounding end of the electric equipment and being connected with the ground wire of the power supply equipment.
3. The hot plug protection circuit as claimed in claim 2, wherein the switch circuit comprises a MOS transistor and a fifth resistor, the gate of the MOS transistor is the controlled terminal of the switch circuit, the source of the MOS transistor is the power input terminal of the switch circuit, and the drain of the MOS transistor is the power output terminal of the switch circuit; the fifth resistor is connected between the source electrode and the grid electrode of the MOS tube in parallel.
4. The hot plug protection circuit of claim 3, wherein the MOS transistor is a P-MOS transistor.
5. The hot plug protection circuit according to any of claims 1 to 4, further comprising a first delay circuit, wherein the first delay circuit comprises a first capacitor and a fourth resistor, a first end of the first capacitor is connected to a common terminal of the power output terminal of the switch circuit and the power input terminal of the electrical device, a second end of the first capacitor is connected to a first end of the fourth resistor, and a second end of the fourth resistor is connected to the ground terminal of the electrical device via the ground terminal of the electrical device.
6. The hot swap protection circuit of claim 1, wherein the trigger circuit comprises a second transistor, a seventh resistor, an eighth resistor, a ninth resistor, and a tenth resistor, a first end of the seventh resistor is connected to the power output of the power supply device, and a second end of the seventh resistor is connected to the ground of the power supply device via the eighth resistor; and the common end of the seventh resistor and the eighth resistor is connected with the base electrode of the second triode, the collector electrode of the second triode is connected with the power output end of the power supply equipment through the ninth resistor, and the emitter electrode of the second triode is connected with the controlled end of the switching circuit through the tenth resistor.
7. The hot plug protection circuit according to claim 6, wherein the switch circuit comprises a power switch chip, the power switch chip comprises a power input pin, a power output pin, an enable input pin and a ground pin, the enable input pin of the power switch chip is connected to the control terminal of the driving circuit, the power input pin of the power switch chip is connected to the power output terminal of the power supply device, the power output pin of the power switch chip is connected to the power input terminal of the power consumption device, and the ground pin of the power switch chip is the ground terminal of the hot plug protection circuit and is used for being connected to the ground of the power supply device via the ground terminal of the power consumption device.
8. The hot swap protection circuit of claim 7, further comprising a second delay circuit comprising a second capacitor and an eleventh resistor, wherein a first terminal of the second capacitor is interconnected with a first terminal of the eleventh resistor, the control terminal of the trigger circuit, and the controlled terminal of the switch circuit, and a second terminal of the second capacitor is connected with a second terminal of the eleventh resistor and to the ground pin of the power switch chip.
9. An electronic device, characterized in that the electronic device comprises a hot plug protection circuit according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620852933.8U CN206097104U (en) | 2016-08-08 | 2016-08-08 | Hot plug protection circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620852933.8U CN206097104U (en) | 2016-08-08 | 2016-08-08 | Hot plug protection circuit and electronic equipment |
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| CN206097104U true CN206097104U (en) | 2017-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620852933.8U Active CN206097104U (en) | 2016-08-08 | 2016-08-08 | Hot plug protection circuit and electronic equipment |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107395182A (en) * | 2017-07-27 | 2017-11-24 | 万科思自控信息（中国）有限公司 | A kind of relaxed starter of split type equipment |
| CN109378808A (en) * | 2017-08-21 | 2019-02-22 | 福州福大海矽微电子有限公司 | A kind of protection circuit for hot plug detection port of low cost |
| CN111273584A (en) * | 2020-02-17 | 2020-06-12 | 维沃移动通信有限公司 | Power supply control device and electronic equipment |
| CN113541121A (en) * | 2021-07-13 | 2021-10-22 | 创维光电科技(深圳)有限公司 | Hot plug protection circuit, plug device and electronic equipment |
| CN114389247A (en) * | 2022-01-17 | 2022-04-22 | 苏州联讯仪器有限公司 | Hot plug protection device, method, equipment and medium |
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2016
- 2016-08-08 CN CN201620852933.8U patent/CN206097104U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107395182A (en) * | 2017-07-27 | 2017-11-24 | 万科思自控信息（中国）有限公司 | A kind of relaxed starter of split type equipment |
| CN109378808A (en) * | 2017-08-21 | 2019-02-22 | 福州福大海矽微电子有限公司 | A kind of protection circuit for hot plug detection port of low cost |
| CN109378808B (en) * | 2017-08-21 | 2019-09-27 | 福州福大海矽微电子有限公司 | A kind of protection circuit for hot plug detection port of low cost |
| CN111273584A (en) * | 2020-02-17 | 2020-06-12 | 维沃移动通信有限公司 | Power supply control device and electronic equipment |
| CN113541121A (en) * | 2021-07-13 | 2021-10-22 | 创维光电科技(深圳)有限公司 | Hot plug protection circuit, plug device and electronic equipment |
| CN113541121B (en) * | 2021-07-13 | 2023-12-01 | 创维光电科技(深圳)有限公司 | Hot plug protection circuit, plug device and electronic equipment |
| CN114389247A (en) * | 2022-01-17 | 2022-04-22 | 苏州联讯仪器有限公司 | Hot plug protection device, method, equipment and medium |
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