TWM572594U - Protection circuit - Google Patents

Abstract

The present disclosure relates to a protection circuit includes a first connection circuit, a second connection circuit, a processing circuit, and a first detection circuit. The first connection circuit is configured to receive a first external power and a first detection signal. The second connecting circuit is configured to receive a second external power and a second detecting signal. The processing circuit is electrically connected to the connection circuits. The first detection circuit is electrically connected to the connection circuit and the processing circuit. When the first detection signal or the second detection signal is changed from a first level to a second level, the first detection circuit transmits a first protection signal to the processing circuit within a buffer time, so that the processing circuit adjusts a working frequency.

Description

protect the circuit

The present disclosure relates to a protection circuit, particularly a circuit capable of detecting whether an external power supply is abnormal.

With the popularity of various mobile electronic devices such as smart phones, tablets and notebooks, consumers are considering more and more factors in purchasing products. For example, the operational effectiveness of mobile electronic devices is an important factor.

In order to enable mobile electronic devices to perform more powerfully, many mobile electronic devices are equipped with multiple power supply ports to receive multiple external powers to ensure that all electronic components in the mobile electronic device can operate smoothly. In this context, the stability of the power supply will be very important. If the power supply is unstable or abnormal in an instant, it is easy to cause damage to the mobile electronic device.

One aspect of the disclosure is a protection circuit including a first connection circuit, a second connection circuit, a processing circuit, and a first detection circuit. The first connecting circuit is configured to receive the first external power and the first detecting signal. The second connecting circuit is configured to receive the second external power and the second detecting signal. The processing circuit is electrically connected to the first connection circuit and the second connection circuit for receiving the first external power and the second external power. The first detecting circuit is electrically connected to the first connecting circuit, the second connecting circuit and the processing circuit for receiving the first detecting signal and the second detecting signal. When the first detection signal or the second detection signal is switched from the first level to the second level, the first detection circuit transmits the first protection signal to the processing circuit, so that the processing circuit adjusts the operating frequency during the buffer period.

The disclosure provides a first protection signal through the first detection circuit when it is determined that there is a power supply abnormality or a plug-in abnormality, so that the processing circuit can complete the frequency reduction within the buffer time. According to this, it is possible to avoid the problem that the electronic component is damaged due to a momentary change in the power supply.

100‧‧‧Protection circuit

110‧‧‧First connection circuit

110a‧‧‧Transmission circuit

111‧‧‧Power terminal

112‧‧‧Detection terminal

113‧‧‧Charging control circuit

120‧‧‧Second connection circuit

130‧‧‧Processing Circuit

131‧‧‧Central Processing Unit

132‧‧‧graphic processor

133‧‧‧ embedded controller

134‧‧‧Set circuit

200‧‧‧Detection unit

210‧‧‧First detection circuit

211‧‧‧Transient protection circuit

211a‧‧‧ diode unit

211b‧‧‧ diode unit

220‧‧‧Second detection circuit

230‧‧‧ third detection circuit

240‧‧‧Four detection circuit

510‧‧‧First comparison circuit

520‧‧‧First input circuit

530‧‧‧Discharge circuit

610‧‧‧Second comparison circuit

620‧‧‧Second input circuit

630‧‧‧ third input circuit

Ca, Cb, Cc‧‧‧ capacitors

T1‧‧‧first transistor switch

T2‧‧‧Second transistor switch

T3‧‧‧third transistor switch

T4‧‧‧4th transistor switch

T5‧‧‧ fifth transistor switch

R1‧‧‧first resistance

C1‧‧‧first capacitor

V1‧‧‧First external power

V2‧‧‧Second external power

Vs1‧‧‧ first power signal

Vs2‧‧‧second power signal

D1‧‧‧ first detection signal

D2‧‧‧ second detection signal

Vcc‧‧‧Power supply

A1‧‧‧ first node

A2‧‧‧ second node

N1‧‧‧ node

N2‧‧‧ node

FIG. 1 is a schematic diagram of a protection circuit according to some embodiments of the present disclosure.

FIG. 2 is a schematic diagram of a transmission circuit according to some embodiments of the present disclosure.

FIG. 3A is a schematic diagram of a first detecting circuit according to some embodiments of the present disclosure.

FIG. 3B is a schematic diagram of a first detecting circuit according to other parts of the disclosure.

FIG. 4 is a schematic diagram of a second detecting circuit according to some embodiments of the present disclosure.

FIG. 5 is a schematic diagram of a third detecting circuit according to some embodiments of the present disclosure.

FIG. 6 is a schematic diagram of a fourth detecting circuit according to some embodiments of the present disclosure.

In the following, a plurality of embodiments of the present invention will be disclosed in the drawings, and for the sake of clarity, a number of practical details will be described in the following description. However, it should be understood that these practical details are not applied to limit the case. That is, in some embodiments of the present disclosure, these practical details are not necessary. In addition, some of the conventional structures and elements are shown in the drawings in a simplified schematic manner in order to simplify the drawings.

As used herein, when an element is referred to as "connected" or "coupled", it may mean "electrically connected" or "electrically coupled". "Connected" or "coupled" can also be used to indicate that two or more components operate or interact with each other. In addition, although the terms "first", "second", and the like are used herein to describe different elements, the terms are used to distinguish the elements or operations described in the same technical terms. The term is not specifically intended or implied in the order or order, and is not intended to limit the invention.

For mobile electronic devices that are powered by multiple power adapters, if some of the power adapters are abnormally powered, the electronic components in the mobile electronic device are easily damaged by the sudden rise in temperature and are also easy because Damage to the system without warning shutdown. There are at least three reasons for the abnormal power supply: First, the power adapter is not positive. Do not plug into the connection of the mobile electronic device (such as: oblique insertion or loose). Second, the power adapter is instantly removed due to external forces. Third, although the power adapter is properly plugged into the connection port of the mobile electronic device, the power supply terminal (such as the commercial power) is powered off instantaneously. The protection circuit of the present disclosure can detect the power supply state for warning or protection according to different situations.

Please refer to FIG. 1 for a schematic view of some embodiments of the present disclosure. The protection circuit 100 includes a first connection circuit 110, a second connection circuit 120, a processing circuit 130, and a detection unit 200. In some embodiments, the protection circuit 100 is installed in a mobile electronic device (eg, a notebook computer), and the first connection circuit 110 and the second connection circuit 120 are connection interfaces of the power supply interface, and the power adapter is used. Electrically connected to transfer power to the mobile electronic device.

The first connection circuit 110 is configured to receive the first external power V1 and the first detection signal D1. The second connection circuit 120 is configured to receive the second external power V2 and the second detection signal D2. In some embodiments, the first connection circuit 110 and the second connection circuit 120 respectively include a transmission circuit for receiving the corresponding first external power V1, the first detection signal D1 or the second external power V2 through the transmission circuit. Second detection signal D2. Please refer to FIGS. 1 and 2, wherein FIG. 2 is a schematic diagram of the transmission circuit 110a of the first connection circuit 110. The transmission circuit 110a includes a plurality of power terminals 111, detection terminals 112, and a tank circuit. The power terminals 111 are configured to receive the first external power V1. The node N1 of the detecting terminal 112 is configured to receive the first detecting signal D1. The energy storage circuit includes a plurality of capacitors Ca~Cc, and the capacitors Ca~Cc are electrically connected to the capacitors through a charge control circuit 113 (eg, a charge control chip charge IC). The power terminal 111 receives the first external power V1 and transmits the first external power V1 to the processing circuit 130. Similarly, the second connection circuit 120 can also be provided with the same transmission circuit, receive the second external power V2 through the plurality of power terminals 111, and receive the second detection signal D2 through the detection terminal 112.

In some embodiments, the detection terminal 112 is a grounding spring. When the power adapter is electrically connected to the first connection circuit 110, the ground terminal in the power adapter will contact the detection terminal 112 to form a ground. Therefore, when the power adapter is properly connected to the first connection circuit 110, the first detection signal D1 will be in a low level or a short circuit state. When the power adapter is not properly connected to the first connection circuit 110 (eg, obliquely inserted or loose), the first detection signal D1 will be in a high level or an open state.

The processing circuit 130 is electrically connected to the first connection circuit 110 and the second connection circuit 120 for receiving the first external power V1 and the second external power V2, so that the mobile electronic device can be driven according to the external powers V1 and V2. . As shown in FIG. 1 , in some embodiments, circuits including a central processing unit 131, a graphics processor 132, an embedded controller 133, and a system setting circuit are collectively referred to as processing circuits. 130. In other embodiments, the processing circuit 130 can also receive the signals transmitted by the first connection circuit 110, the second connection circuit 120, and the detection unit 200 through a receiving circuit, and then notify the central processing unit 131 and the graphic according to the signal. The processor 132, the embedded controller 133, and the setting circuit 134.

In the case where the mobile electronic device must pass through the power supply of the two external powers V1 and V2 in order to exert its full operational performance, if the first When the power supply of the connection circuit 110 or the second connection circuit 120 is abnormal, it is easy to cause damage to the processing circuit 130. Therefore, the disclosure detects the abnormality of the power supply through the detecting unit 200, and prevents the processing circuit 130 from being damaged due to the transient change of the power supply. As shown in FIG. 1 , the detecting unit 200 includes a first detecting circuit 210 . The first detecting circuit 210 is electrically connected to the first connecting circuit 110, the second connecting circuit 120, and the processing circuit 130 for receiving the first detecting signal D1 and the second detecting signal D2. When the first detection signal D1 or the second detection signal D2 is switched from the first level to the second level, the first detection circuit 210 transmits the first protection signal to the processing circuit 130, so that the processing circuit 130 can To adjust the operating frequency during a buffer period (for example, to adjust the operating frequency of the central processing unit 131 or the graphics processor 132).

For example, in the case where the power adapter is properly connected to the corresponding first connection circuit 110 or the second connection circuit 120, the detection terminal 112 of the transmission circuit 110a contacts the ground terminal in the power adapter to form a ground. At this time, the first detection signal D1 and the second detection signal D2 will form a ground potential due to a short circuit. When the power adapter is not properly connected to the first connection circuit 110 or the second connection circuit 120 (eg, suddenly removed, obliquely inserted), because the detection terminal 112 will become an open state, the first detection signal D1 or the second The potential of the detection signal D2 will change correspondingly with the end of the first detection circuit 210 for receiving the first detection signal D1 and the second detection signal D2 (eg, become a relatively high potential). Once the first detecting circuit 210 determines that the first detecting signal D1 or the second detecting signal D2 is changed from the ground potential to the high potential, the first detecting circuit continues to transmit during the buffering period (eg, 2 milliseconds). a protection signal to the processing circuit 130, The processing circuit 130 is caused to perform a down-conversion process.

Accordingly, since the first detecting circuit 210 can send the first protection signal when the abnormality is determined, the processing circuit 130 performs the frequency reduction processing, thereby preventing the mobile electronic device from being changed due to the instantaneous power supply. The problem of damage to electronic components.

In some embodiments, the first detecting circuit 210 is electrically connected to the first connecting circuit 110 and the second connecting circuit 120 through a transient protection circuit. Referring to FIG. 1 and FIG. 3A , in some embodiments of the present disclosure, the first detecting circuit 210 is configured to be connected to the transient protection circuit 211 of the first connecting circuit 110 . The transient protection circuit 211 includes a first transistor switch T1. The control terminal of the first transistor switch T1 is electrically connected to the node N1 of the detecting terminal 112 (as shown in FIG. 2) for receiving the first detecting signal D1 and electrically connected to the power supply Vcc. The first end of the transistor switch T1 is electrically coupled to the processing circuit 130, for example to the central processor 131 or the graphics processor 132. The second end of the first transistor switch T1 is electrically connected to a reference potential (eg, a ground terminal). When the first detection signal D1 is switched from the first level to the second level, the first transistor switch T1 is turned on, so that the processing circuit 130 transmits the first protection signal according to the reference potential.

In some embodiments, the transient protection circuit 211 further includes a first capacitor C1 and a first resistor R1. The first end of the first capacitor C1 receives the first detection signal D1 through the node N2, and is electrically connected to the power supply Vcc. The second end of the first capacitor C1 is electrically connected to the control end of the first transistor switch T1. The first end of the first resistor R1 is electrically connected to the second end of the first capacitor C1. As shown in Figures 2 and 3A, when the detection terminal 112 is properly connected to the power supply When the grounding terminal of the adapter is used, the first detection signal D1 detected by the node N2 is the grounding level, the first transistor switch T1 remains turned off, and the power supply Vcc charges the first capacitor C1. When the detecting terminal 112 is not connected to the grounding terminal of the power adapter and forms an open circuit, the voltage signal at the node N2 (ie, the first detecting signal D1) rises to a high level due to the power supply Vcc. At this time, the first capacitor C1 will discharge, and the first transistor switch T1 is turned on. The processing circuit 130 receives the ground signal (ie, the first protection signal) through the diode unit 211a and the first transistor switch T1, and performs frequency reduction processing accordingly. The on-time of the first transistor switch T1, that is, the buffer time, depends on the first capacitor C1 and the first resistor R1.

Similarly, the first detection circuit 210 is electrically connected to the second connection circuit 120 through the same transient protection circuit 211 for generating the first protection signal according to the second detection signal D2, and will not be repeated herein.

The arrangement of the first capacitor C1 and the first resistor R1 is not limited to the circuit drawn in FIG. 3A. Referring to FIG. 3B , in another embodiment of the disclosure, the first detecting circuit 210 is configured to be connected to the transient protection circuit 211 of the first connecting circuit 110 . In this embodiment, the transient protection circuit 211 includes a first transistor switch T1, a first capacitor C1, and a first resistor R1. The control end of the first capacitor C1 is configured to receive the first detection signal D1 and is electrically connected to the power supply Vcc and the control end of the first transistor switch T1. The first end of the first resistor R1 is electrically connected to the first end of the first capacitor C1. The operation principle of the transient protection circuit 211 shown in FIG. 3B is the same as that of FIG. 3A. The first transistor switch T1 is turned on according to the discharge of the first capacitor C1. However, in this embodiment, the first end of the first transistor switch T1 is electrically Connected to the embedded controller 133, the embedded controller 133 can send a protection command to the setting circuit 134 according to the first protection signal, and the mobile electronic device can be down-converted by software or hardware control.

In other embodiments, the protection circuit 100 is provided with the transient protection circuit 211 shown in FIGS. 3A and 3B to ensure the function of the transient protection. As shown in FIG. 3B, the transient protection circuit 211 further includes a diode unit 211b. The diode unit 211b includes at least one diode, the anode of which is electrically connected to the power supply Vcc, and the cathode of the diode unit 212 is configured to receive the first detection signal D1. In this embodiment, the diode unit 211b includes two diodes connected in series but reversed, and the negative terminals of the diodes are electrically connected to the node N1 of the detecting terminal 112 (as shown in FIG. 2). To receive the first detection signal D1. The positive terminals of the diodes are electrically connected to the power supply Vcc and the node N2 of the transient protection circuit 211 shown in FIG. The diode unit 211b is used to prevent the voltage on the control terminal of the first transistor switch T1 shown in FIG. 3B from affecting the operation of other circuits.

In the foregoing embodiment, the disclosure is used to determine whether the power adapter is correctly connected to the first connection circuit 110 or the second connection circuit 120 (ie, the connection port of the mobile electronic device) through the first detection circuit 210 to prevent the first An external power V1 or a second external power V2 is not correctly transmitted or not completely transmitted to the processing circuit 130, causing damage to the mobile electronic device. In other embodiments, the protection circuit 100 can achieve other protection effects. Referring to FIGS. 1 to 4, in some embodiments, the protection circuit 100 further includes a second detection circuit 220. The second detecting circuit 220 is electrically connected to the first connecting circuit 110, the second connecting circuit 120, and the processing circuit 130. When the first connection is connected When the circuit 110 and the second connection circuit 120 receive only one of the first external power V1 and the second external power V2, the second detection circuit 220 generates a second protection signal, so that the processing circuit 130 adjusts the second protection signal according to the second protection signal. working frequency. Accordingly, when the power adapter is pulled out of the mobile electronic device, the second detecting circuit 220 can determine the change of the external power V1, V2, and notify the processing circuit 130 to enable the processing circuit 130 to perform the frequency down processing. In addition, the processing circuit 130 can also notify the system to generate a warning interface to notify the user to check the connection status between the power adapter and the mobile electronic device.

In some embodiments, the first connection circuit 110 is configured to generate the first power signal Vs1 according to the first external power V1, and the second connection circuit 120 is configured to generate the second power signal Vs2 according to the second external power V2. As shown in FIG. 2, the transmission circuit 110a can use the potential of the first node A1 as the first power signal Vs1 according to the first external power V1. If the first connection circuit 110 receives the first external power V1, the first power signal Vs1 will be high, and if the first connection circuit 110 does not receive the second external power V2, the first power signal Vs2 will be low. Potential. Similarly, the second connection circuit 120 can receive the second power signal Vs2 in the same manner.

The second detecting circuit 220 can generate the second protection signal according to the first power signal Vs1 and the second power signal Vs2. As shown in FIG. 4, in some embodiments, the second detecting circuit 220 further includes a second transistor switch T2 and a third transistor switch T3. The control end of the second transistor switch T2 is configured to receive the first power signal Vs1, and the first end of the second transistor switch T2 is electrically connected to the processing circuit 130. The control end of the third transistor switch T3 is configured to receive the second power signal Vs2, and the first end of the third transistor switch T3 is electrically connected to the first The second end of the second transistor switch T2. That is, the second transistor switch T2 is connected in series with the third transistor switch T3 to form a multiplier circuit. When the first power signal Vs1 and the second power signal Vs2 are both high voltages, the second transistor switch T2 and the third transistor switch T3 are turned on, so that the processing circuit receives the second protection signal with a low potential, indicating that the power supply is normal. On the contrary, when one of the first power signal Vs1 and the second power signal Vs2 is a low voltage, the second transistor switch T2 or the third transistor switch T3 will be disconnected, so that the processing circuit 130 receives the power through the power supply Vcc. The second protection signal of high potential represents abnormal power supply. At this time, the processing circuit 130 can perform a down-conversion process to avoid damage to internal electronic components.

In addition, as described above, the power adapter may also be abnormally connected to the mains, and the power adapter may be properly connected to the first connection circuit 110 and the second connection circuit 120, but actually cannot provide corresponding power. Referring to FIG. 5 , in some embodiments, the protection circuit 100 can detect the condition through the third detection circuit 230 included in the detection unit 200 . The third detecting circuit 230 includes a first comparing circuit 510 and a discharging circuit 530. The two input ends of the first comparison circuit 510 are electrically connected to the charge control circuit 113 and the first input circuit 520, respectively. The first input circuit 520 is configured to generate a set signal according to the power supply Vcc, for example, a standard voltage of 0.8 volts or a standard current of 10 amps.

The first comparison circuit 510 can receive the load signal from the charge control circuit 113. The load signal is the voltage or current in the charge control circuit 113. When the first external power V1 or the second external power V2 is abnormal, the load signal in the charge control circuit 113 will be able to produce a corresponding change. If The first comparison circuit 510 outputs a discharge signal when it is determined that the load signal is smaller than the set signal, indicating that the power supply is abnormal (for example, the mains power is suddenly turned off). The discharge circuit 530 is electrically connected between the power supply terminals 111 and the storage circuit for being turned on according to the discharge signal, so that the capacitors Ca to Cc in the storage circuit are rapidly discharged through the discharge circuit 530.

As shown in FIGS. 2 and 5, since the charge control circuit 113 is provided between the power supply terminal 111 and the storage circuit, even when an abnormality occurs in the first external power V1 or the second external power V2, even in the storage circuit. The power is still stored, but the third detecting circuit 230 can still detect the abnormality through the load signal of the charging control circuit 113. Accordingly, the energy storage circuit can be quickly discharged, so that the detecting unit 200 transmits the second protection signal through the second detecting circuit 220, and the processing circuit 130 performs the frequency reduction processing.

In some embodiments, the discharge circuit 530 further includes a fourth transistor switch T4. The control terminal of the fourth transistor switch T4 is electrically connected to the output end of the first comparison circuit 510 for receiving the discharge signal. The first end of the fourth transistor switch is electrically connected between the power terminals 111 and the tank circuit, for example, the second node A2 shown in FIG. The second end of the fourth transistor switch T4 is electrically connected to the ground. Thus, when the fourth transistor switch T4 is turned on according to the discharge signal, the tank circuit will be able to pass through the second node A2 and be discharged by the discharge circuit 530.

Referring to FIG. 6 , in some embodiments of the disclosure, the detecting unit 200 further includes a fourth detecting circuit 240 . The fourth detection circuit 240 includes a second comparison circuit 610. When the fourth detecting circuit 610 determines that the first external power V1 or the second external power V2 is less than the threshold value, the output third The signal is protected to the processing circuit 130 such that the processing circuit 130 performs a down-conversion process.

As shown in FIG. 6 , in some embodiments, the first input end of the second comparison circuit 610 is electrically connected to the first connection circuit 110 or the second connection circuit 120 through the second input circuit 620 . The second end of the second comparison circuit 610 is electrically connected to the third input circuit 630. The third input circuit 630 is configured to generate a threshold according to the voltage value of the second node A2, for example, a standard voltage of 18.15 volts. The output end of the second comparison circuit 610 is electrically connected to the control end of the fifth transistor switch T5. The first end of the fifth transistor switch T5 is electrically connected to the processing circuit, and the second end of the fifth transistor switch T5 is electrically connected to the first detecting signal D1 (if the second comparing circuit 610 is used to compare the second external The second end of the fifth transistor switch T5 is electrically connected to the second detecting signal D2) to be turned on when the fifth transistor switch T5 is turned on according to the third protection signal, and the processing circuit is 130 can be used for frequency reduction processing.

The present disclosure has been disclosed in the above embodiments, but it is not intended to limit the present invention. Any one skilled in the art can make various changes and retouchings without departing from the spirit and scope of the novel. The scope of protection of the content is subject to the definition of the scope of the patent application.

Claims (10)

A protection circuit includes: a first connection circuit for receiving a first external power and a first detection signal; and a second connection circuit for receiving a second external power and a second detection signal; a processing circuit electrically connected to the first connecting circuit and the second connecting circuit for receiving the first external power and the second external power; and a first detecting circuit electrically connected to the first The first detection signal and the second detection signal are received by the connection circuit, the second connection circuit and the processing circuit, wherein the first detection signal or the second detection signal is determined by a first level When switching to a second level, the first detecting circuit transmits a first protection signal to the processing circuit, so that the processing circuit adjusts an operating frequency during a buffering period. The protection circuit of claim 1, wherein the first detection circuit is electrically connected to the first connection circuit and the second connection circuit through a transient protection circuit, the transient protection circuit comprising: a first a crystal switch, a control end of the first transistor switch is configured to receive the first detection signal or the second detection signal, and is electrically connected to a power supply, a first end of the first transistor switch Electrically connected to the processing circuit, a second end of the first transistor switch is electrically connected to a reference potential; and the first detection signal or the second detection signal is switched from the first level to the first When the second level is used, the first transistor switch is turned on to make the processing circuit root The first protection signal is transmitted according to the reference potential. The protection circuit of claim 2, wherein the transient protection circuit further comprises: a first capacitor, a first end of the first capacitor is configured to receive the first detection signal or the second detection signal, And electrically connected to the power supply, a second end of the first capacitor is electrically connected to the control end of the first transistor switch; and a first resistor, a first end of the first resistor is electrically Connected to a second end of the first capacitor. The protection circuit of claim 2, wherein the transient protection circuit further comprises: a first capacitor, a first end of the first capacitor is configured to receive the first detection signal or the second detection signal, And electrically connected to the power supply and the control end of the first transistor switch; a first resistor, a first end of the first resistor is electrically connected to the first end of the first capacitor; and a The anode of the diode unit is electrically connected to the power supply, and the cathode of the diode unit is configured to receive the first detection signal or the second detection signal. The protection circuit of claim 1, further comprising: a second detecting circuit electrically connected to the first connecting circuit, the second And connecting the circuit and the processing circuit, when the first connection circuit and the second connection circuit only receive one of the first external power and the second external power, the second detection circuit generates a second protection signal And causing the processing circuit to adjust the operating frequency according to the second protection signal. The protection circuit of claim 5, wherein the first connection circuit is configured to generate a first power signal according to the first external power, and the second connection circuit is configured to generate a second power signal according to the second external power The second detecting circuit further includes: a second transistor switch, a control end of the second transistor switch is configured to receive the first power signal, and a first end of the second transistor switch is electrically connected In the processing circuit; and a third transistor switch, a control end of the third transistor switch is configured to receive the second power signal, and a first end of the third transistor switch T3 is electrically connected to the first A second end of the transistor switch. The protection circuit of claim 1, wherein the first connection circuit and the second connection circuit respectively comprise a transmission circuit, the transmission circuit comprising: a plurality of power terminals for receiving the first external power or the second External power; a detecting terminal for receiving the first detecting signal or the second detecting signal; and a storage circuit electrically connected to the power source through a charging control circuit a terminal to receive the first external power or the second external power and to transmit the first external power or the second external power to the processing circuit. The protection circuit of claim 7, further comprising: a third detecting circuit, comprising: a first comparing circuit electrically connected to the charging control circuit, wherein when the first comparing circuit is determining the charging control circuit When a load signal is less than a set signal, a discharge signal is generated; and a discharge circuit is electrically connected between the power supply terminals and the energy storage circuit for being turned on according to the discharge signal, so that the energy storage circuit is Discharge through the discharge circuit. The protection circuit of claim 8, wherein the discharge circuit comprises a fourth transistor switch, and one control end of the fourth transistor switch is electrically connected to an output end of the first comparison circuit for receiving the The first end of the fourth transistor switch is electrically connected between the power terminals and the energy storage circuit, and the second end of the fourth transistor switch is electrically connected to a ground. The protection circuit of claim 9, further comprising: a fourth detecting circuit, comprising a second comparing circuit, wherein the second comparing circuit is electrically connected to the first connecting circuit or the second connecting circuit, When the fourth detecting circuit determines that the first external power or the second external power is less than a threshold, the third detecting circuit outputs a third protection signal to the processing circuit.