CN216774288U - Input power supply detection protection circuit and terminal equipment - Google Patents
Input power supply detection protection circuit and terminal equipment Download PDFInfo
- Publication number
- CN216774288U CN216774288U CN202122906836.6U CN202122906836U CN216774288U CN 216774288 U CN216774288 U CN 216774288U CN 202122906836 U CN202122906836 U CN 202122906836U CN 216774288 U CN216774288 U CN 216774288U
- Authority
- CN
- China
- Prior art keywords
- power supply
- capacitor
- resistor
- detection protection
- charging chip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The embodiment of the utility model discloses an input power supply detection protection circuit and terminal equipment, wherein the terminal equipment comprises a mainboard, and a power supply charging chip and an input power supply detection protection circuit are arranged on the mainboard; the input power supply detection protection circuit is connected with the power supply charging chip; the input power supply detection protection circuit outputs corresponding power supply voltage to supply power to the power supply charging chip according to the input power supply; the power supply charging chip controls the power supply detection protection circuit to convert the power supply voltage into system voltage and output power supply; the input power supply detection protection circuit stops outputting the power supply voltage when detecting that the input power supply is negative voltage. When the negative-pressure input power supply appears, the negative-pressure output is cut off, and the damage of the negative pressure to a rear-stage power supply system can be avoided.
Description
Technical Field
The utility model relates to the technical field of electronics, in particular to an input power supply detection protection circuit and terminal equipment.
Background
Computers are widely used in work and life and become essential tools in the information society. The mainboard is used as a core center of the computer, is a core system operation module of the computer and is also an indispensable module for the computer; whether the computer system can work stably or not directly influences the stability of work due to the good and bad performance of the computer system. The stability of mainboard is relevant with the power, and take the notebook as the example, when the notebook inserts the adapter, probably reverse plug appears, or the power is unstable, factor such as negative voltage level appears and derives to irritate whole power supply system, leads to power supply system to be destroyed.
SUMMERY OF THE UTILITY MODEL
In view of the above technical problems, embodiments of the present invention provide an input power detection protection circuit and a terminal device, where an input power is converted into a system voltage and outputs power when the input power is normal, and the output is stopped when the input power has a negative voltage, so as to prevent the negative voltage from damaging a subsequent power system.
The embodiment of the utility model provides an input power supply detection protection circuit, which is connected with a power supply charging chip and comprises an interface module and a detection protection module, wherein the interface module is connected with the detection protection module and the power supply charging chip;
the interface module outputs power supply voltage to the detection protection module and the power supply charging chip for power supply after surge discharge, electromagnetic interference resistance and filtering processing are carried out on an input power supply;
when the detection protection module detects that the input power supply is normal, the detection protection module converts the power supply voltage into system voltage according to a control signal output by the power supply charging chip and outputs power supply; and when the input power supply is detected to be negative pressure, stopping outputting the power supply voltage.
Optionally, in the input power detection protection circuit, the interface module includes a power interface, a first diode, a first fuse, a first capacitor, and a second capacitor;
a power pin of the power interface is connected with the cathode of the first diode, one end of the first capacitor and one end of the first fuse; the other end of the first fuse is a power supply end and is connected with one end of a second capacitor; the ground foot of the power interface, the anode of the first diode, the other end of the first capacitor and the other end of the second capacitor are all grounded.
Optionally, in the input power detection protection circuit, the interface module further includes a third capacitor and a second fuse;
one end of the third capacitor is connected with the negative electrode of the first diode and one end of the first capacitor, the other end of the third capacitor is grounded, and the second fuse is connected with the first fuse in parallel.
Optionally, in the input power detection protection circuit, the detection protection module includes a first switching tube, a second switching tube, a third switching tube, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first resistor, a second resistor, a third resistor, and a second diode;
the drain electrode of the first switching tube is connected with a power supply end and one end of a fourth capacitor; the grid electrode of the first switching tube is connected with the other end of the fourth capacitor, the drain electrode of the third switching tube, one end of the fifth capacitor, the grid electrode of the second switching tube and the ACRV pin of the power charging chip; the source electrode of the first switching tube is connected with the other end of the fifth capacitor, the source electrode of the second switching tube, the CMSRC pin of the power supply charging chip, one end of the second resistor and the source electrode of the third switching tube; the grid electrode of the third switching tube is connected with the other end of the second resistor and one end of the first resistor, the other end of the first resistor is grounded, and the drain electrode of the second switching tube is connected with one end of the third resistor and the ACP pin of the power supply charging chip; the other end of the third resistor is a power supply end, an ACN pin connected with a power supply charging chip UB and one end of a sixth capacitor; the other end of the sixth capacitor is grounded, the anode of the second diode is connected with the power supply end, and the cathode of the second diode is connected with the VCC pin of the power supply charging chip.
Optionally, in the input power detection protection circuit, the detection protection module further includes a fourth resistor, a fifth resistor, and a sixth resistor;
one end of the fourth resistor is connected with the grid electrode of the first switching tube; the other end of the fourth resistor is connected with the other end of the fourth capacitor, one end of the fifth capacitor and one end of the fifth resistor; the other end of the fifth resistor is connected with an ACRV pin of the power supply charging chip, and the sixth resistor is connected between the source electrode of the second switching tube and the CMSRC pin of the power supply charging chip.
Optionally, in the input power detection protection circuit, the detection protection module further includes a seventh capacitor, an eighth capacitor, a ninth capacitor, a seventh resistor, and an eighth resistor;
one end of the seventh capacitor is connected with one end of the third resistor, one end of the eighth capacitor and one end of the seventh resistor; the other end of the seventh capacitor is connected with the other end of the third resistor, one end of the ninth capacitor and one end of the eighth resistor; the other end of the seventh resistor is connected with an ACN pin of the power supply charging chip, and the other end of the eighth resistor is connected with an ACN pin of the power supply charging chip.
Optionally, in the input power detection protection circuit, the detection protection module further includes a ninth resistor and a tenth capacitor;
one end of the ninth resistor is connected with the negative electrode of the second diode, the other end of the ninth resistor is connected with one end of the tenth capacitor and the VCC pin of the power charging chip, and the other end of the tenth capacitor is grounded.
A second aspect of the embodiments of the present invention provides a terminal device, including a motherboard, where a power charging chip is disposed on the motherboard, and the motherboard is further provided with the input power detection protection circuit, and the input power detection protection circuit is connected to the power charging chip;
the input power supply detection protection circuit outputs corresponding power supply voltage to supply power to the power supply charging chip according to the input power supply; the power supply charging chip controls the power supply detection protection circuit to convert the power supply voltage into system voltage and output power supply; the input power supply detection protection circuit stops outputting the power supply voltage when detecting that the input power supply is negative voltage.
In the technical scheme provided by the embodiment of the utility model, the terminal equipment comprises a mainboard, wherein a power charging chip and an input power detection protection circuit are arranged on the mainboard; the input power supply detection protection circuit is connected with the power supply charging chip; the input power supply detection protection circuit outputs corresponding power supply voltage to supply power to the power supply charging chip according to the input power supply; the power supply charging chip controls the power supply detection protection circuit to convert the power supply voltage into system voltage and output power supply; the input power supply detection protection circuit stops outputting the power supply voltage when detecting that the input power supply is negative voltage. When the negative-pressure input power supply appears, the negative-pressure output is cut off, and the damage of the negative pressure to a rear-stage power supply system can be avoided.
Drawings
Fig. 1 is a block diagram of a terminal device according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a motherboard according to an embodiment of the utility model.
Fig. 3 is a circuit diagram of an interface module according to an embodiment of the present invention.
Fig. 4 is a schematic circuit diagram of a detection protection module according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The embodiments of the present invention, and all other embodiments obtained by those skilled in the art without any inventive step, belong to the protection scope of the present invention.
Referring to fig. 1 and fig. 2, a terminal device according to an embodiment of the present invention includes a main board, where the main board is provided with an input power detection protection circuit 10 and a power charging chip UB, and the input power detection protection circuit 10 is connected to the power charging chip UB; the input power supply detection protection circuit 10 outputs a corresponding power supply voltage + VADP to supply power to a power supply charging chip UB according to an input power supply; the power charging chip UB controls the power detection protection circuit 10 to convert the power voltage + VADP into the system voltage + VBATA and output power; when the input power detection protection circuit 10 detects that the input power is negative, the output of the power supply voltage + VADP is stopped.
The terminal equipment can be computer equipment such as a desktop computer, a notebook computer, a tablet computer, an all-in-one machine, a mobile phone and an extension product. The power charging chip UB is in the prior art, and the model thereof is preferably BQ24780S, where only pins and connection relations related to this embodiment are shown, and names and connection relations of other pins are in the prior art, and are not described herein again. The position of each circuit on the motherboard (as shown in fig. 2) is only an example, and the circuit can be laid out as required in specific implementation; only the devices related to this embodiment are shown here, and other devices on the motherboard are in the prior art, which is not described here again.
The input power detection protection circuit 10 comprises an interface module 110 and a detection protection module 120, wherein the interface module 110 is connected with the detection protection module 120 and a power charging chip UB, and after the interface module 110 performs surge discharge, electromagnetic interference resistance and filtering processing on an input power, the interface module outputs power voltage + VADP to supply power to the detection protection module 120 and the power charging chip UB; when the detection protection module 120 detects that the input power is normal, the power supply voltage + VADP is converted into the system voltage + VBATA according to the control signal output by the power supply charging chip UB, and power is output; when the input power supply is detected to be negative, the output of the power supply voltage + VADP is stopped. Therefore, when the negative-pressure input power supply appears, the output of the negative pressure is cut off, and the negative pressure is prevented from damaging a rear-stage power supply system.
Referring to fig. 3, the interface module 110 includes a power interface DC, a first diode D1, a first fuse F1, a first capacitor C1, and a second capacitor C2; a power pin (shown as a pin 1 to a pin 4) of the power interface DC is connected to a negative electrode of the first diode D1, one end of the first capacitor C1 and one end of the first fuse F1; the other end of the first fuse F1 is a power supply terminal (output power supply voltage + VADP), and is connected to one end of the second capacitor C2; the ground pin (in this embodiment, pins 5 to 8 and pin G1) of the power interface DC, the positive electrode of the first diode D1, the other end of the first capacitor C1 and the other end of the second capacitor C2 are all grounded.
The first diode D1 is a TVS diode for discharging surge, a first fuse F1 (preferably F1206FA7000V024TM) and a first capacitor C1 (preferably 0.1uF) form an EMI (electromagnetic interference) preventing interference device, and a second capacitor C2 (preferably 10uF) is used for filtering. When the adapter power supply is plugged into a power supply interface DC (a common power supply interface), the input power supply + VADP _ CONN is subjected to surge discharge, electromagnetic interference resistance and filtering treatment in sequence, and then the power supply voltage + VADP is output.
Preferably, in order to increase the EMI prevention effect, the interface module 110 further includes a third capacitor C3 and a second fuse F2, one end of the third capacitor C3 is connected to the negative electrode of the first diode D1 and one end of the first capacitor C1, the other end of the third capacitor C3 is grounded, and the second fuse F2 is connected in parallel to the first fuse F1.
The third capacitor C3 (with the capacitance value of 0.1uF preferably) and the second fuse F2 (with the model number of F1206FA7000V024TM preferably) are matched with the first fuse F1 and the first capacitor C1, so that the EMI prevention effect can be enhanced.
Referring to fig. 4, the detection protection module 120 includes a first switch Q1, a second switch Q2, a third switch Q3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a first resistor R1, a second resistor R2, a third resistor R3, and a second diode D2; the drain electrode of the first switch tube Q1 is connected with a power supply end and one end of a fourth capacitor C4; the grid electrode of the first switching tube Q1 is connected with the other end of the fourth capacitor C4, the drain electrode of the third switching tube Q3, one end of the fifth capacitor C5, the grid electrode of the second switching tube Q2 and the ACDRV pin of the power supply charging chip UB; the source of the first switching tube Q1 is connected to the other end of the fifth capacitor C5, the source of the second switching tube Q2, the CMSRC pin of the power charging chip UB, one end of the second resistor R2 and the source of the third switching tube Q3; the grid electrode of the third switching tube Q3 is connected with the other end of the second resistor R2 and one end of the first resistor R1, the other end of the first resistor R1 is grounded, and the drain electrode of the second switching tube Q2 is connected with one end of the third resistor R3 and an ACP pin of the power supply charging chip UB; the other end of the third resistor R3 is a power supply terminal (output system voltage + VBATA), an ACN pin connected to the power charging chip UB, and one end of the sixth capacitor C6; the other end of the sixth capacitor C6 is grounded, the anode of the second diode D2 is connected to the power supply terminal, and the cathode of the second diode D2 is connected to the VCC pin of the power charging chip UB.
The first switching tube Q1 (preferably, MDU1514URH), the second switching tube Q2 (preferably, MDU1514URH), and the third switching tube Q4 (preferably, BSS138) are NMOS tubes. The first resistor R1 (with resistance value of 1M Ω preferably) and the second resistor R2 (with resistance value of 3M Ω preferably) form a voltage dividing circuit, and the on-off state of the third switching tube Q3 is controlled by dividing voltage and positive and negative voltage. The fourth capacitor C4 and the fifth capacitor C5 are parasitic capacitors of the switching tube and control on-off time (on-off speed) of the Q1 and the Q2 respectively.
During normal operation, the power supply voltage + VADP output by the interface module 110 supplies power to the power charging chip UB through the second diode D2, at this time, the power supply voltage + VADP is positive voltage, the power charging chip UB operates and outputs a high-level control signal ACDRV (the power charging chip UB has a built-in high voltage, and the voltage value is higher than the voltage on the CMSRC pin by 6V) to control the first switching tube Q1 and the second switching tube Q2 to be turned on, the power supply voltage + VADP is output (converted into a first voltage + VADP _ CHG) through the first switching tube Q1 to the source of the second switching tube Q2 and the CMSRC pin of the power charging chip UB (supplies power to the power charging chip UB, and outputs the control signal ACDRV after boosting the voltage on the CMSRC pin), and is output (converted into a second voltage + VADP _ PWR) through the second switching tube Q2, and is output through the third resistor R3 and the sixth capacitor C6 (for filtering and storing energy, and the capacitor value is preferably 10uF) to output a system voltage + VBATA, and the power supply is supplied to the whole power supply system. Meanwhile, the third resistor R3 is an over-current detection preventing resistor, the current at the two ends of the third resistor R3 is sampled and transmitted to the power supply charging chip UB for processing, so that the voltage value of the output system voltage + VBATA can be obtained, and when the system voltage + VBATA is too high or too low, the power supply charging chip UB can adjust the control signal ACDRV to control the conduction degree of the Q1 and the Q2, so that the system voltage + VBATA can be adjusted to meet the required voltage value requirement and stabilize the voltage. In normal operation, the source of the third switching transistor Q3 receives the second voltage + VADP _ PWR, but the divided voltage at the gate is small enough to turn on the Q3, i.e., the GS voltage of the Q3 is low, and the Q3 is turned off.
When the power supply is abnormal, the power supply interface DC has negative level input, the power supply voltage + VADP is negative voltage at the moment, and the second diode D2 can prevent the negative voltage input power supply from charging the chip UB to cause the damage of the chip UB. At this time, the power charging chip UB keeps outputting the high-level control signal ACDRV to control the first switching tube Q1 and the second switching tube Q2 to be turned on, and the negative power supply voltage + VADP is outputted as the negative second voltage + VADP _ PWR through the first switching tube Q1, so that the source of the third switching tube Q3 is also negative, and since the other end of the first resistor R1 is grounded, the voltage division by R1 and R2 is equivalent to making the GS of the Q3 positive, the Q3 is turned on to short-circuit the drain and the source thereof, so that the source and the gate of the second switching tube Q2 are short-circuited, the Q2 is turned off, and the negative second voltage + VADP _ PWR is stopped being outputted. Due to the fact that the time of negative voltage occurrence is short, the sixth capacitor C6 discharges when the Q2 is cut off, positive system voltage + VBATA can be output for a period of time, and power failure cannot occur. And recovering the normal working state after the negative pressure disappears, and recovering the normal output of the system voltage + VBATA.
Preferably, the detection protection module 120 further includes a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6; one end of the fourth resistor R4 is connected with the grid of the first switch tube Q1; the other end of the fourth resistor R4 is connected with the other end of the fourth capacitor C4, one end of the fifth capacitor C5 and one end of the fifth resistor R5; the other end of the fifth resistor R5 is connected with an ACDRV pin of a power supply charging chip UB, and the sixth resistor R6 is connected between the source of the second switching tube Q2 and the CMSRC pin of the power supply charging chip UB. Wherein, R4 to R6 are current-limiting resistors, R4 (with a resistance value of preferably 10R Ω) is used for protecting Q1 and driving, R5 (with a resistance value of preferably 4.02K Ω) is used for protecting Q3 and driving, and R6 (with a resistance value of preferably 4.02K Ω) is used for protecting power supply charging chip UB and avoiding the device protected by sudden high voltage burning.
Preferably, the detection protection module 120 further includes a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a seventh resistor R7, and an eighth resistor R8; one end of the seventh capacitor C7 is connected with one end of the third resistor R3, one end of the eighth capacitor C8 and one end of the seventh resistor R7; the other end of the seventh capacitor C7 is connected to the other end of the third resistor R3, one end of the ninth capacitor C9 and one end of the eighth resistor R8; the other end of the seventh resistor R7 is connected to the ACP pin of the power charging chip UB, and the other end of the eighth resistor R8 is connected to the ACN pin of the power charging chip UB. The seventh capacitor C7, the eighth capacitor C8, the ninth capacitor C9, the seventh resistor R7 and the eighth resistor R8 are used for removing interference, so that the current acquired by the third resistor R3 is more stable and cleaner, and the calculated voltage value is more accurate.
Preferably, the detection protection module 120 further includes a ninth resistor R9 and a tenth capacitor C10, one end of the ninth resistor R9 is connected to the negative electrode of the second diode D2, the other end of the ninth resistor R9 is connected to one end of the tenth capacitor C10 and the VCC pin of the power charging chip UB, and the other end of the tenth capacitor C10 is grounded. The ninth resistor R9 and the tenth capacitor C10 are used for filtering the input power voltage + VADP, so that the power charging chip UB operates more stably.
Referring to fig. 2 to fig. 4, the terminal device is a notebook computer, and the working principle thereof is as follows:
normal operation (i.e., positive input power + VADP — CONN): the adapter power supply is inserted into the power interface DC, the input power supply + VADP _ CONN is subjected to surge prevention, EMI prevention and filtering treatment in sequence, and then the output power supply voltage + VADP supplies power to the power supply charging chip UB and is further transmitted to the drain electrode of the first switching tube Q1. At this time, the GS voltage of the third switching transistor Q3 is low, and the third switching transistor Q3 is turned off. The power supply charging chip UB is powered on to work, a high-level control signal ACDRV is output to control the first switch tube Q1 and the second switch tube Q2 to be conducted, power supply voltage + VADP is output to the source electrode of the Q2 and the CMSRC pin of the power supply charging chip UB through the first switch tube Q1, the power supply voltage + VADP is output through the second switch tube Q2, and system voltage + VBATA is output after passing through the third resistor R3 and the sixth capacitor C6 to supply power to the whole power supply system.
When the power supply charging chip UB keeps outputting the high-level control signal ACDRV, the first switching tube Q1 and the second switching tube Q2 are controlled to be turned on, the negative power supply voltage + VADP is outputted as the negative second voltage + VADP _ PWR through the first switching tube Q1, the source of the third switching tube Q3 is also negative, the GS of the Q3 is positive through the voltage division of the R1 and the R2, the Q3 is turned on to short the drain and the source thereof, so that the source and the gate of the second switching tube Q2 are short-circuited, the Q2 is turned off, the output of the negative second voltage + VADP _ PWR is stopped, the negative system voltage + VBATA is not generated to supply power, and the negative voltage is poured into and destroys the power supply system at the subsequent stage.
The sixth capacitor C6 is fully charged during normal operation, discharges when Q2 is cut off, and can support outputting positive system voltage + VBATA for a period of time through discharging of C6 before normal recovery based on short time of negative voltage occurrence, and power failure does not occur during negative voltage. And recovering the normal working state after the negative pressure disappears, namely recovering the normal output of the system voltage + VBATA.
In summary, the input power detection protection circuit and the terminal device provided by the utility model can convert the input power into the system voltage and output the system voltage to the power system of the subsequent stage for power supply after performing surge discharge, electromagnetic interference resistance and filtering processing on the input power when the input power detection protection circuit and the terminal device work normally, and can detect and correspondingly adjust the voltage value of the system voltage + VBATA, so that the required voltage value requirement is met, voltage stabilization processing is performed, and the stability of power supply is improved; when the input power supply is detected to have abnormal negative pressure, the output of the negative pressure is cut off, so that the negative pressure is prevented from being injected into a rear-stage power supply system to cause damage, and the effect of protecting the power supply system is achieved; the circuit has a simple structure, uses fewer devices, is beneficial to PCB layout, can increase the input power supply detection protection circuit to detect negative pressure and disconnect the output of the negative pressure before all circuits needing power supply, and has strong compatibility.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. An input power supply detection protection circuit is connected with a power supply charging chip and is characterized by comprising an interface module and a detection protection module, wherein the interface module is connected with the detection protection module and the power supply charging chip;
the interface module outputs power supply voltage to the detection protection module and the power supply charging chip for power supply after surge discharge, electromagnetic interference resistance and filtering processing are carried out on an input power supply;
when the detection protection module detects that the input power supply is normal, the detection protection module converts the power supply voltage into system voltage according to the control signal output by the power supply charging chip and outputs power supply; and when the input power supply is detected to be negative pressure, stopping outputting the power supply voltage.
2. The input power detection protection circuit of claim 1, wherein the interface module comprises a power interface, a first diode, a first fuse, a first capacitor, and a second capacitor;
a power pin of the power interface is connected with the cathode of the first diode, one end of the first capacitor and one end of the first fuse; the other end of the first fuse is a power supply end and is connected with one end of a second capacitor; the ground foot of the power interface, the anode of the first diode, the other end of the first capacitor and the other end of the second capacitor are all grounded.
3. The input power detection protection circuit of claim 2, wherein the interface module further comprises a third capacitor and a second fuse;
one end of the third capacitor is connected with the negative electrode of the first diode and one end of the first capacitor, the other end of the third capacitor is grounded, and the second fuse is connected with the first fuse in parallel.
4. The input power detection protection circuit of claim 2, wherein the detection protection module comprises a first switch tube, a second switch tube, a third switch tube, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first resistor, a second resistor, a third resistor and a second diode;
the drain electrode of the first switching tube is connected with a power supply end and one end of a fourth capacitor; the grid electrode of the first switching tube is connected with the other end of the fourth capacitor, the drain electrode of the third switching tube, one end of the fifth capacitor, the grid electrode of the second switching tube and the ACRV pin of the power charging chip; the source electrode of the first switching tube is connected with the other end of the fifth capacitor, the source electrode of the second switching tube, the CMSRC pin of the power supply charging chip, one end of the second resistor and the source electrode of the third switching tube; the grid electrode of the third switching tube is connected with the other end of the second resistor and one end of the first resistor, the other end of the first resistor is grounded, and the drain electrode of the second switching tube is connected with one end of the third resistor and an ACP pin of the power supply charging chip; the other end of the third resistor is a power supply end, an ACN pin connected with a power supply charging chip UB and one end of a sixth capacitor; the other end of the sixth capacitor is grounded, the anode of the second diode is connected with the power supply end, and the cathode of the second diode is connected with the VCC pin of the power supply charging chip.
5. The input power detection protection circuit of claim 4, wherein the detection protection module further comprises a fourth resistor, a fifth resistor, and a sixth resistor;
one end of the fourth resistor is connected with the grid electrode of the first switching tube; the other end of the fourth resistor is connected with the other end of the fourth capacitor, one end of the fifth capacitor and one end of the fifth resistor; the other end of the fifth resistor is connected with an ACRV pin of the power supply charging chip, and the sixth resistor is connected between the source electrode of the second switching tube and the CMSRC pin of the power supply charging chip.
6. The input power detection protection circuit of claim 4, wherein the detection protection module further comprises a seventh capacitor, an eighth capacitor, a ninth capacitor, a seventh resistor, and an eighth resistor;
one end of the seventh capacitor is connected with one end of the third resistor, one end of the eighth capacitor and one end of the seventh resistor; the other end of the seventh capacitor is connected with the other end of the third resistor, one end of the ninth capacitor and one end of the eighth resistor; the other end of the seventh resistor is connected with an ACN pin of the power supply charging chip, and the other end of the eighth resistor is connected with an ACN pin of the power supply charging chip.
7. The input power detection protection circuit of claim 4, wherein the detection protection module further comprises a ninth resistor and a tenth capacitor;
one end of the ninth resistor is connected with the negative electrode of the second diode, the other end of the ninth resistor is connected with one end of the tenth capacitor and the VCC pin of the power charging chip, and the other end of the tenth capacitor is grounded.
8. A terminal device, comprising a main board, wherein a power charging chip is arranged on the main board, and the terminal device is further provided with an input power detection protection circuit according to any one of claims 1 to 7; the input power supply detection protection circuit is connected with the power supply charging chip;
the input power supply detection protection circuit outputs corresponding power supply voltage to supply power to the power supply charging chip according to the input power supply; the power supply charging chip controls the power supply detection protection circuit to convert the power supply voltage into system voltage and output power supply; the input power supply detection protection circuit stops outputting the power supply voltage when detecting that the input power supply is negative voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122906836.6U CN216774288U (en) | 2021-11-25 | 2021-11-25 | Input power supply detection protection circuit and terminal equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122906836.6U CN216774288U (en) | 2021-11-25 | 2021-11-25 | Input power supply detection protection circuit and terminal equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216774288U true CN216774288U (en) | 2022-06-17 |
Family
ID=81962659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122906836.6U Active CN216774288U (en) | 2021-11-25 | 2021-11-25 | Input power supply detection protection circuit and terminal equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216774288U (en) |
-
2021
- 2021-11-25 CN CN202122906836.6U patent/CN216774288U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101256437A (en) | Mainboard voltage feed circuit | |
| CN111949592B (en) | Hot plug circuit device suitable for LVDS | |
| CN105633905A (en) | Overvoltage and under-voltage protection circuit | |
| CN101876846A (en) | Computer power supply and standby voltage discharge circuit thereon | |
| CN111934304A (en) | Protection circuit and protection method for preventing hot plug voltage surge | |
| CN216774288U (en) | Input power supply detection protection circuit and terminal equipment | |
| CN104035538A (en) | Main board protection circuit | |
| CN110502088B (en) | Battery power supply protection device and server | |
| CN112018724B (en) | Overvoltage protection circuit | |
| US8335066B2 (en) | Protection circuit and electronic device using the same | |
| CN214412262U (en) | Protection circuit, circuit board and protection system | |
| CN215267624U (en) | Fan power supply protection circuit for port equipment | |
| CN107526422B (en) | System power supply overvoltage protection system of storage server | |
| CN113746079B (en) | Hot plug circuit, control device and equipment | |
| CN212231075U (en) | Overvoltage protection circuit with time-delay self-recovery function | |
| CN212231073U (en) | Overcurrent protection circuit with alarming and time-delay self-recovery functions | |
| TW202123613A (en) | Overvoltage protection circuit and method thereof | |
| US11831145B2 (en) | Current sensing protection device for sensing whether current sensing element occurs short phenomenon | |
| CN106972743B (en) | Capacitor discharge circuit, and module power supply and redundancy system with same | |
| CN218733231U (en) | Prevent circuit and electronic equipment of striking sparks | |
| CN201127057Y (en) | Power supply and protective circuit for USB interface as well as digital television receiver having the same | |
| CN214412278U (en) | Surge protection circuit based on discrete component and computer equipment | |
| CN220190893U (en) | Power supply circuit and KVM switch | |
| CN217036746U (en) | Mining check out test set current-limiting protection circuit | |
| CN216721167U (en) | Hot plug circuit and electronic equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |