CN218472760U - Power-down protection circuit and electronic product - Google Patents
Power-down protection circuit and electronic product Download PDFInfo
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- CN218472760U CN218472760U CN202222376341.1U CN202222376341U CN218472760U CN 218472760 U CN218472760 U CN 218472760U CN 202222376341 U CN202222376341 U CN 202222376341U CN 218472760 U CN218472760 U CN 218472760U
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Abstract
The embodiment of the utility model discloses power down protection circuit and electronic product. The power-down protection circuit comprises a power-on switch module, a voltage holding module and a voltage detection module, wherein the voltage holding module is used for charging based on the voltage at the input end of the power-down protection circuit and holding the charged voltage when the input end of the power-down protection circuit is powered down; the voltage detection module is used for detecting the voltage of the input end of the power-down protection circuit, and when the input end of the power-down protection circuit is powered down, the voltage detection module is communicated with the power-on switch module so as to accelerate the switching-off of the power-on switch module. Drop carelessly at the electronic product, the connection shell fragment of battery takes place the vibration, leads to contact failure, and voltage falls the fluctuation fast, during the production electric arc, the embodiment of the utility model provides a last electric switch module on can turn-off power supply passage cuts off the electric current immediately, prevents that the electronic product from crashing, has solved the slow problem of protection circuit action when current protection circuit has the power hot plug.
Description
Technical Field
The embodiment of the utility model provides a relate to power protection technical field, especially relate to a power down protection circuit and electronic product.
Background
When an electronic product or equipment with a battery connected in a manner of contacting with a spring piece type contact is used, when the electronic product or equipment is dropped carelessly, for example, dropped to the ground from a certain height, the battery connecting spring piece can vibrate, contact failure is caused, voltage drops rapidly and fluctuates, an electric arc is generated, and a dead halt is caused with probability.
The conventional protection circuit judges input undervoltage by detecting the voltage value input by a power supply, drives a short-circuit switch to short-circuit a grid source electrode of a PMOS (P-channel metal oxide semiconductor) switch and turns off the PMOS switch, so that quick response to voltage drop is realized, and hot plug protection is realized. However, the conventional protection circuit performs undervoltage detection only by setting a threshold to start protection, and the PMOS switch is not fast enough in turn-off speed, so that the conventional protection circuit has poor performance and low circuit reliability.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a power down protection circuit and electronic product to cut off the electric current immediately when the voltage shake, prevent that the electronic product from crashing, be favorable to improving the reliability of circuit and the protective capacities of product.
In a first aspect, an embodiment of the present invention provides a power down protection circuit, include:
the power-on switch module is connected between the input end of the power-down protection circuit and the output end of the power-down protection circuit;
the voltage holding module is connected with the input end of the power-down protection circuit and used for charging based on the voltage of the input end of the power-down protection circuit and holding the charged voltage when the input end of the power-down protection circuit is powered down;
the voltage detection module is connected with the input end of the power-down protection circuit and is used for detecting the voltage of the input end of the power-down protection circuit; the voltage detection module is also connected with the voltage holding module and the power-on switch module and is used for communicating the voltage holding module and the power-on switch module to turn off the power-on switch module when the input end of the power-off protection circuit is powered off.
Optionally, the voltage detection module includes a control switch, and the control switch includes an input terminal, a control terminal, and an output terminal;
the input end of the control switch is connected with the voltage holding module, the control end of the control switch is connected with the input end of the power-down protection circuit, and the output end of the control switch is connected with the power-on switch module; the control switch is used for being switched on when the input end of the power failure protection circuit is powered down, and the voltage maintaining module discharges charges to the power-on switch module so as to switch off the power-on switch module.
Optionally, the power-on switch module includes a power-on switch, an input end of the power-on switch is connected to an input end of the power-down protection circuit, an output end of the power-on switch is connected to an output end of the power-down protection circuit, and a control end of the power-on switch is connected to the voltage detection module.
Optionally, the voltage maintaining module comprises:
the anode of the diode is connected with the input end of the power-down protection circuit;
and the first end of the first capacitor is connected with the cathode of the diode and the voltage detection module, and the second end of the first capacitor is grounded.
Optionally, the voltage keeping module further includes a first resistor connected between the cathode of the diode and the first end of the first capacitor.
Optionally, the power-on switch module further comprises a second capacitor;
the first end of the second capacitor is connected with the input end of the power-on switch, the second end of the second capacitor is connected with the control end of the power-on switch, and the capacitance value of the first capacitor is larger than that of the second capacitor.
Optionally, the power-down protection circuit further includes a second resistor, and the second resistor and the second capacitor are connected in parallel to the input end of the power-up switch and the control end of the power-up switch.
Optionally, the power-down protection circuit further includes a third resistor, a first end of the third resistor is connected to the control end of the power-up switch, and a second end of the third resistor is grounded.
Optionally, the power-down protection circuit further includes a fourth resistor, and the fourth resistor is connected between the output end of the control switch and the power-on switch module.
In a second aspect, an embodiment of the present invention further provides an electronic product, including the first aspect, the power down protection circuit.
The embodiment of the utility model provides a technical scheme, voltage detection module detects the voltage of power down protection circuit's input, and the voltage maintenance module charges based on the voltage of power down protection circuit's input, and when power down protection circuit's input falls, voltage detection module makes voltage maintenance module and last electric switch module intercommunication, and the voltage maintenance module is to the electric switch module electric charge that discharges, applys reverse voltage for last electric switch module, turns off with higher speed last electric switch module. Therefore, it is obvious that dropping carelessly at the electronic product, the connection shell fragment of battery takes place to vibrate, leads to contact failure, and the voltage falls fluctuation fast, during the production electric arc, the embodiment of the utility model provides a last electric switch module on can turn-off the power supply passage fast cuts off the electric current immediately, prevents that the electronic product from crashing, has solved the slow problem of protection circuit action when current protection circuit has the power hot plug, is favorable to avoiding taking place the device under the voltage fluctuation condition and damages, has effectively improved the reliability of circuit and the protective capacities of product.
Drawings
Fig. 1 is a schematic structural diagram of a power down protection circuit provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another power down protection circuit provided in an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another power down protection circuit provided in an embodiment of the present invention;
fig. 4 is a voltage waveform diagram of a power down protection circuit according to an embodiment of the present invention when a power supply voltage drops;
fig. 5 is a protection waveform diagram of a power down protection circuit according to an embodiment of the present invention when a power supply voltage drops down slightly;
fig. 6 is a protection waveform diagram of a power down protection circuit provided by an embodiment of the present invention when the power supply voltage drop amplitude is too small;
fig. 7 is a protection waveform diagram of another power down protection circuit according to an embodiment of the present invention when the power supply voltage drops.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures associated with the present invention are shown in the drawings, not all of them.
The existing protection circuit can only start protection by setting a threshold value, the turn-off speed of a PMOS switch is not fast enough, the actual test turn-off time of the circuit is more than 20ms, and the circuit structure is complex, so that the performance of the existing protection circuit is poor, and the reliability of the circuit is low.
To the above technical problem, the embodiment of the utility model provides a power down protection circuit is provided, fig. 1 is the embodiment of the utility model provides a power down protection circuit's schematic structure diagram. Referring to fig. 1, the power down protection circuit includes a power-on switch module 100, a voltage holding module 200, and a voltage detection module 300.
The power-on switch module 100 is connected between the input end Vin of the power-down protection circuit and the output end Vout of the power-down protection circuit; the voltage holding module 200 is connected with the input end Vin of the power-down protection circuit, and the voltage holding module 200 is used for charging based on the voltage of the input end Vin of the power-down protection circuit and holding the charged voltage when the input end Vin of the power-down protection circuit is powered down; the voltage detection module 300 is connected to the input terminal Vin of the power-down protection circuit and is configured to detect the voltage at the input terminal Vin of the power-down protection circuit, and the voltage detection module 300 is further connected to the voltage holding module 200 and the power-on switch module 100 and is configured to connect the voltage holding module 200 and the power-on switch module 100 when the input terminal Vin of the power-down protection circuit is powered down, so as to accelerate the turn-off of the power-on switch module 100.
The power-on switch module 100 can be, but not limited to, a Metal Oxide Semiconductor Field Effect Transistor (MOSFET), such as a PMOS Transistor. Therefore, when the input terminal Vin of the power down protection circuit is powered on, the power-on switch module 100 is turned on, so that the input terminal Vin and the output terminal Vout of the power down protection circuit are communicated with each other. It can be understood that when the upper electrical switch module 100 is turned off, the input terminal Vin and the output terminal Vout of the power down protection circuit are disconnected from each other, i.e. the power supply is cut off.
Specifically, the voltage holding module 200 is configured to charge based on the voltage at the input terminal Vin of the power down protection circuit, and to hold the charged voltage value when the input terminal Vin of the power down protection circuit is powered down, where the voltage holding module 200 is charged when the input terminal Vin of the power down protection circuit and the output terminal Vout thereof are connected, and the voltage holding module 200 can hold the voltage inside the power down protection circuit at the charged voltage value when the input terminal Vin of the power down protection circuit is powered down.
As can be seen, the voltage detection module 300 is configured to detect the voltage at the input terminal Vin of the power down protection circuit together with the voltage holding module 200, and when the voltage drop rate and the amplitude of the input terminal Vin of the power down protection circuit exceed the threshold, the voltage detection module 300 serves as an action switch of the power down protection circuit to control the action of the protection circuit, so that the voltage holding module 200 is communicated with the power-on switch module 100, and a reverse voltage is applied to the power-on switch module 100 to turn off the power-on switch module 100.
With continued reference to fig. 1, it can be seen that the working principle of the power-down protection circuit is as follows, when a battery is plugged or an electronic product falls, the battery connecting elastic sheet can vibrate, causing voltage jitter and generating electric arcs; when voltage jitter occurs and the input terminal Vin of the power down protection circuit loses power, the voltage holding module 200 can hold the internal voltage thereof at the charged voltage value, and when the voltage detection module 300 and the voltage holding module 200 detect that the voltage drop rate and amplitude of the input terminal Vin of the power down protection circuit exceed the threshold value, the voltage detection module 300 enables the voltage holding module 200 and the power-on switch module 100 to be communicated, and applies reverse voltage to the power-on switch module 100 to rapidly turn off the power-on switch module 100, so as to cut off the connection between the input terminal Vin and the output terminal Vout of the power down protection circuit.
Therefore, when an electronic product drops carelessly, the connecting elastic sheet of the battery vibrates to cause poor contact of a contact, the voltage drops rapidly and fluctuates, and electric arcs are generated, the power-on switch module on a power supply path can be turned off, the current is cut off immediately, the electronic product is prevented from being halted, the problem that the action of the protection circuit is slow when the existing protection circuit has power supply hot plug is solved, the damage of devices under the condition of voltage fluctuation is avoided, and the reliability of the circuit and the protection capability of the product are effectively improved.
In addition to the above embodiments, the following description is made of a specific structure of the power down protection circuit, but the present invention is not limited thereto. Fig. 2 is a schematic structural diagram of another power down protection circuit provided in the embodiment of the present invention, referring to fig. 2, optionally, the power up switch module 100 includes the power up switch 110, the input end of the power up switch 110 is connected to the input end Vin of the power down protection circuit, the output end of the power up switch 110 is connected to the output end Vout of the power down protection circuit, and the control end of the power up switch 110 is connected to the voltage detection module 300. The voltage detection module 300 includes a control switch 310, the control switch 310 including an input terminal, a control terminal, and an output terminal; the input end of the control switch 310 is connected to the voltage holding module 200, the control end of the control switch 310 is connected to the input end Vin of the power-down protection circuit, and the output end of the control switch 310 is connected to the control end of the power-up switch 110.
Optionally, the voltage maintaining module 200 includes a diode D1 and a first capacitor C1. The anode of the diode D1 is connected with the input end Vin of the power-down protection circuit; the capacitor is used for conducting current in a single direction, forms a high voltage holding function with the first capacitor C1, and avoids electric spark ignition caused by large current generated by the first capacitor C1 when the power failure protection circuit is electrified, thereby protecting the circuit and components.
A first end of the first capacitor C1 is connected to the cathode of the diode D1 and the voltage detection module 300, and a second end of the first capacitor C1 is grounded; the first capacitor C1 is used to form a high voltage holding function with the diode D1, and when the voltage detection module 300 is turned on, the first capacitor C1 discharges charges to the control terminal of the upper electric switch 110.
The power-up switch module 100 further includes a second capacitor C2; a first end of the second capacitor C2 is connected to the input end of the upper electric switch 110, and a second end of the second capacitor C2 is connected to the control end of the upper electric switch 110; the device is used for delaying the start of the power-on time of the power-on switch 110, and preventing the power-on switch 110 from generating electric sparks to strike sparks or generating electric arcs when being powered on.
The capacitance value of the first capacitor C1 is greater than that of the second capacitor C2; when the voltage at the control end of the control switch 310 drops to turn on, the first capacitor C1 can discharge a large current to the second capacitor C2 through the control switch 310, and since the first capacitor C1 is much larger than the second capacitor C2, the voltage at the control end of the power-on switch 110 can be higher than the voltage at the input end.
Optionally, the power-down protection circuit further includes a second resistor R1 and a third resistor R2, the second resistor R1 and the second capacitor C2 are connected in parallel to the input end of the power-up switch 110 and the control end of the power-up switch 110, the first end of the third resistor R2 is connected to the control end of the power-up switch 110, and the second end of the third resistor R2 is grounded; the second resistor R1 is used for dividing voltage to the power-on switch 110 to prevent breakdown caused by overvoltage of voltage difference between the control terminal and the input terminal of the power-on switch 110, and protect the power-on switch 110, and the third resistor R2 is used for dividing voltage to the power-on switch 110 together with the second resistor R1 to prevent breakdown caused by overvoltage of voltage difference between the control terminal and the input terminal of the power-on switch 110, and protect the power-on switch 110.
Therefore, the specific working principle of the power down protection circuit shown in fig. 2 is as follows:
when the battery is plugged or the electronic product falls, the battery connecting elastic sheet can vibrate to cause voltage jitter and generate electric arcs; when voltage jitter is generated and the input end Vin of the power-down protection circuit is powered down, the voltage of the control end of the control switch 310 is reduced along with the input end Vin of the power-down protection circuit, because the first capacitor C1 can keep the internal voltage at the charged voltage value, the voltage of the input end of the control switch 310 is kept at a higher voltage value by the first capacitor C1, when the voltage difference between the control end and the input end of the control switch 310 is greater than the threshold voltage, the control switch 310 is switched on, and the first capacitor C1 discharges charges to the second end of the second capacitor C2, so that the voltages at the two ends of the second capacitor C2 are changed; since the first end of the second capacitor C2 is connected to the input end of the upper electric switch 110, and the second end of the second capacitor C2 is connected to the control end of the upper electric switch 110, the voltage difference between the two ends of the second capacitor C2 is equal to the voltage difference between the control end and the input end of the upper electric switch 110; because the input terminal Vin of the power-down protection circuit is powered down, and the first capacitor C1 discharges charges to the second terminal of the second capacitor C2, so that the second terminal voltage of the second capacitor C2 is increased, the input terminal voltage of the power-up switch 110 is decreased, the control terminal voltage of the power-up switch 110 is increased, the control terminal voltage of the power-up switch 110 is far greater than the voltage of the input terminal of the power-up switch 110, and the power-up switch 110 can be turned off rapidly.
Therefore, when an electronic product drops carelessly, the connecting elastic sheet of the battery vibrates to cause poor contact of a contact, the voltage drops rapidly and fluctuates, and electric arcs are generated, the power-on switch module on a power supply path can be turned off, the current is cut off immediately, the electronic product is prevented from being halted, the problem that the action of the protection circuit is slow when the existing protection circuit has a power supply hot plug is solved, the damage of a device is avoided under the condition of voltage fluctuation, and the reliability of the circuit and the protection capability of the product are effectively improved.
Fig. 3 is a schematic structural diagram of another power down protection circuit provided in an embodiment of the present invention, referring to fig. 3, optionally, the power down protection circuit further includes a first resistor R3, and the first resistor R3 is connected between the cathode of the diode D1 and the first end of the first capacitor C1; the first resistor R3 is used for limiting the current of the diode D1, and the diode D1 is prevented from being burnt due to overlarge current.
Optionally, the power down protection circuit further includes a fourth resistor R4, where the fourth resistor R4 is connected between the output end of the control switch 310 and the power-on switch module 100; the fourth resistor R4 is used to limit the current of the control switch 310, so as to prevent the control switch 310 from being burnt due to excessive current.
Based on the power down protection circuit that fig. 3 shows, it is right that following test result through actual power down protection circuit the embodiment of the utility model provides a technical scheme's beneficial effect divides four aspects to be expounded, nevertheless does not regard as right the utility model discloses a limit.
In a first aspect, a device loaded with the power down protection circuit shown in fig. 3 is tested using a dc voltage.
Fig. 4 is a voltage waveform diagram of a power down protection circuit when a power supply voltage drops, according to an embodiment of the present invention. Referring to fig. 4, vout is a voltage waveform of an output terminal of the power down protection circuit, vin is a voltage waveform of an input terminal of the power down protection circuit, and Vc is a voltage waveform of a second terminal of a second capacitor C2 of the power down protection circuit.
According to the test result, when the power supply voltage of the device using the power down protection circuit in fig. 3 drops, the voltage Vc of the second end of the second capacitor C2 is greater than the voltage Vin of the input end of the power down protection circuit, that is, the voltage at the control end of the power-on switch 110 is greater than the voltage Vin of the input end of the power down protection circuit. Therefore, the embodiment of the utility model provides a through setting up the power down protection circuit for equipment when the voltage jitter, goes up electric switch 110's control end voltage and can be raised, goes up electric switch 110's control end voltage and is greater than the input end voltage of going up electric switch 110, cuts off electric switch 110 effectively, is favorable to avoiding taking place the device under the condition of voltage fluctuation and damages.
In a second aspect, the dc voltage is used to test the device that loads the power down protection circuit shown in fig. 3.
Fig. 5 is a protection waveform diagram of a power down protection circuit when a power supply voltage drops down to a small extent. Referring to fig. 5, vout is a voltage waveform of an output terminal of the power down protection circuit, vin is a voltage waveform of an input terminal of the power down protection circuit, and Vc is a voltage waveform of a second terminal of a second capacitor C2 of the power down protection circuit; vh refers to the voltage waveform of the first terminal of the first capacitor C1 of the power down protection circuit.
According to the test result, when the power supply voltage drops slightly, the first capacitor C1 discharges a small amount of charges to the second capacitor C2, the voltage Vc of the second end of the second capacitor C2 is greater than the voltage Vin of the input end of the power failure protection circuit, that is, the control end voltage of the power-on switch 110 is greater than the voltage Vin of the input end of the power failure protection circuit, and the voltage Vout of the output end of the power failure protection circuit is powered on in a delayed manner by using the device adopting the power failure protection circuit in fig. 3. Therefore, the embodiment of the utility model provides a through setting up the power down protection circuit for equipment also can turn off effectively at voltage jitter when less and go up switch 110, has effectively improved the reliability of circuit and the protective capacities of product.
And in the third aspect, the action condition of the power failure protection circuit is tested when the amplitude of the power supply voltage drop is too small.
Fig. 6 is a protection waveform diagram of a power down protection circuit when the power supply voltage drop amplitude is too small. Referring to fig. 6, vin refers to a voltage waveform of an input terminal of the power down protection circuit, and Vc refers to a voltage waveform of a second terminal of a second capacitor C2 of the power down protection circuit; vh refers to a voltage waveform of a first end of a first capacitor C1 of the power down protection circuit.
According to the test result, when the power supply voltage drop amplitude of the device adopting the power-down protection circuit in fig. 3 is too small, the first capacitor C1 does not act and does not discharge electric charges, and the voltage Vc of the second end of the second capacitor C2 generates fine jitter along with the voltage Vin of the input end of the power-down protection circuit. Therefore, the embodiment of the utility model provides a through setting up the power down protection circuit for equipment can not cause the influence in voltage shake undersize, and the power down protection circuit does not move, can avoid unnecessarily turning off power-on switch 110, has effectively improved the reliability of circuit.
And fourthly, testing the response time of the power failure protection circuit for protection action when the voltage drops.
Fig. 7 is a protection waveform diagram of another power down protection circuit according to an embodiment of the present invention when the power supply voltage drops. Referring to fig. 7, vout is a voltage waveform of an output terminal of the power down protection circuit, vin is a voltage waveform of an input terminal of the power down protection circuit, and Vg is a voltage waveform of a control terminal of the power up switch 110 of the power down protection circuit; iin refers to the current waveform at the input of the power down protection circuit.
According to the test result, when the power supply voltage drops, the response time of the power-down protection circuit in fig. 3 is 3.67ms, the voltage rise time of the control end of the power-on switch 110 is within 1ms, the protection action is rapid, the problem that the action of the protection circuit is slow when the power supply is hot plugged in the existing protection circuit is solved, the device damage under the condition of voltage fluctuation can be avoided, and the reliability of the circuit and the protection capability of the product are effectively improved.
Therefore, the power-on switch module on the power supply path can be turned off, the current is immediately cut off, the electronic product is prevented from being halted, the problem that the action of the protection circuit is slow when the existing protection circuit has a power supply hot plug is solved, the device damage under the condition of voltage fluctuation can be avoided, and the reliability of the circuit and the protection capability of the product are effectively improved.
The embodiment of the utility model provides an electric equipment is still provided, include the utility model discloses the power down protection circuit that arbitrary embodiment provided, the effect of its technical principle and realization is similar, no longer gives unnecessary details.
It should be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles applied thereto. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A power down protection circuit, comprising:
the power-on switch module is connected between the input end of the power-down protection circuit and the output end of the power-down protection circuit;
the voltage holding module is connected with the input end of the power-down protection circuit and used for charging based on the voltage of the input end of the power-down protection circuit and holding the charged voltage when the input end of the power-down protection circuit is powered down;
the voltage detection module is connected with the input end of the power-down protection circuit and is used for detecting the voltage of the input end of the power-down protection circuit; the voltage detection module is also connected with the voltage holding module and the power-on switch module and is used for communicating the voltage holding module and the power-on switch module to turn off the power-on switch module when the input end of the power-off protection circuit is powered off.
2. The power down protection circuit of claim 1, wherein the voltage detection module comprises a control switch comprising an input terminal, a control terminal, and an output terminal;
the input end of the control switch is connected with the voltage holding module, the control end of the control switch is connected with the input end of the power-down protection circuit, and the output end of the control switch is connected with the power-on switch module; the control switch is used for being switched on when the input end of the power failure protection circuit is powered down, and the voltage maintaining module discharges charges to the power-on switch module so as to switch off the power-on switch module.
3. The circuit of claim 1, wherein the power-up switch module comprises a power-up switch, an input of the power-up switch is connected to an input of the power-down protection circuit, an output of the power-up switch is connected to an output of the power-down protection circuit, and a control of the power-up switch is connected to the voltage detection module.
4. The power down protection circuit of claim 3, wherein the voltage maintenance module comprises:
the anode of the diode is connected with the input end of the power-down protection circuit;
and a first end of the first capacitor is connected with the cathode of the diode and the voltage detection module, and a second end of the first capacitor is grounded.
5. The power down protection circuit of claim 4, wherein the voltage holding module further comprises a first resistor coupled between the cathode of the diode and the first end of the first capacitor.
6. The power down protection circuit of claim 4, wherein the power up switch module further comprises a second capacitor;
the first end of the second capacitor is connected with the input end of the power-on switch, the second end of the second capacitor is connected with the control end of the power-on switch, and the capacitance value of the first capacitor is larger than that of the second capacitor.
7. The power-down protection circuit according to claim 6, further comprising a second resistor connected in parallel with the second capacitor to the input terminal of the power-up switch and the control terminal of the power-up switch.
8. The power-down protection circuit according to claim 6, further comprising a third resistor, wherein a first end of the third resistor is connected to the control end of the power-up switch, and a second end of the third resistor is grounded.
9. The power-down protection circuit of claim 2, further comprising a fourth resistor connected between the output of the control switch and the power-up switch module.
10. An electronic product comprising a power down protection circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222376341.1U CN218472760U (en) | 2022-09-07 | 2022-09-07 | Power-down protection circuit and electronic product |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222376341.1U CN218472760U (en) | 2022-09-07 | 2022-09-07 | Power-down protection circuit and electronic product |
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| CN218472760U true CN218472760U (en) | 2023-02-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024051255A1 (en) * | 2022-09-07 | 2024-03-14 | 海能达通信股份有限公司 | Power failure protection circuit and electronic device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024051255A1 (en) * | 2022-09-07 | 2024-03-14 | 海能达通信股份有限公司 | Power failure protection circuit and electronic device |
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