TWI386108B - Esd protection circuit applied to electronic apparatus - Google Patents

Description

Electrostatic discharge protection circuit and electronic device having electrostatic discharge protection circuit

The invention relates to an electrostatic discharge protection circuit, in particular to an electrostatic discharge protection circuit capable of effectively absorbing static electricity.

Static electricity is everywhere in everyday life. Although some static electricity is difficult to feel, it may be enough to cause abnormalities or breakdown of certain electronic components in the circuit, such as transistors, control wafers, etc., especially some small signal processing circuits are more susceptible to static electricity. . When an object with static electricity comes into contact with the board, the surrounding electronic components are discharged and damaged. Therefore, how to improve the stability of the circuit and reduce the occurrence of defective parts is an extremely important issue.

In addition to improving the quality of the part itself, its peripheral electrostatic discharge protection circuit is also important. In the early days, the voltage was clamped at a certain point by two diodes, such as zero voltage (ground), power supply voltage, and the like. Thus, if the static electricity is large, it is easy to cause the voltage to be too high at both ends of the diode to damage the diode, and the electrostatic discharge protection is lost, thereby directly affecting the normal operation of the circuit and even damaging the electronic components on the circuit board.

Please refer to FIG. 1. FIG. 1 is a schematic diagram of a conventional electrostatic discharge protection circuit 1 applied to a liquid crystal display. The following is only for the electrostatic discharge protection circuit 1 shown in FIG. 1 , and the other circuit architecture shown in FIG. 1 is the basic structure of the conventional liquid crystal display, and details are not described herein again. As shown in FIG. 1, the conventional liquid crystal display includes four electrostatic discharge protection circuits 1, and three RGB signal lines and one video graphics array (VGA) signal line are respectively connected to the four electrostatic discharge protection circuits 1. Since the circuit configurations of the four ESD protection circuits 1 are the same, the following describes the single ESD protection circuit 1.

As shown in FIG. 1, the ESD protection circuit 1 is composed of two diodes 10, 12 and a capacitor 14. The video graphics array (VGA) voltage signal is applied to the pins 16 of the diodes 10, 12, the pins 18 are connected to the ground GND, and the pins 20 are connected to the power supply terminal VCC. Under normal circumstances, the two diodes 10, 12 are turned off and the ESD protection circuit 1 does not operate. When a negative abnormal voltage is applied to the board, the diode 10 is turned on and the voltage at pin 16 is clamped to zero voltage (ground). On the other hand, when a positive abnormal voltage is applied to the board, the diode 12 is turned on, the voltage of the pin 16 is clamped to the power supply voltage, and the capacitor 14 is charged, thereby generating a filtering effect to reduce The impact on the power supply VCC.

From the above working principle of the electrostatic discharge protection circuit 1, the main purpose is to control the voltage of the pins 16 of the diodes 10, 12 between zero voltage and the power supply voltage to achieve a back-end circuit. The role of ). However, if a strong static electricity is generated from the outside world (the voltage and current are large and the duration is long) or the main unit leakage is large, it will be transmitted to the circuit board of the liquid crystal display through the signal line, and the electronic component is easily damaged. .

Accordingly, it is an object of the present invention to provide an electrostatic discharge protection circuit that utilizes a plurality of voltage stabilizing circuits to effectively absorb static electricity to solve the above problems.

According to an embodiment, the electrostatic discharge protection circuit of the present invention includes a plurality of voltage stabilizing circuits, a first diode, and a second diode. A plurality of voltage stabilizing circuits are connected in parallel between a power terminal and a ground terminal. The anode of the first diode is connected to the power terminal, and the cathode of the first diode is connected to a plurality of voltage regulator circuits. The anode of the second diode is connected to a plurality of voltage stabilizing circuits, and the cathode of the second diode is connected to the ground.

According to another embodiment, if the static electricity belongs to a high frequency voltage, the electrostatic discharge of the present invention The electrical protection circuit can additionally include an RC circuit. The RC circuit is connected in parallel with a plurality of voltage stabilizing circuits, and the RC circuit is connected between the power terminal and the ground terminal.

According to another embodiment, if the power source is an alternating current, the electrostatic discharge protection circuit of the present invention may further comprise a third diode and a fourth diode. The anode of the third diode is connected to the plurality of voltage stabilizing circuits and the power terminal, the anode of the third diode is connected to the cathode of the fourth diode, and the anode of the fourth diode is connected to the plurality of voltage stabilizing circuits With the ground.

According to another embodiment, if the static electricity belongs to a high frequency voltage and the power source is an alternating current, the electrostatic discharge protection circuit of the present invention may further comprise an RC circuit, a third diode, and a fourth diode. The RC circuit is connected in parallel with a plurality of voltage stabilizing circuits, and the RC circuit is connected between the power terminal and the ground terminal. The anode of the third diode is connected to the RC circuit and the power terminal, the anode of the third diode is connected to the cathode of the fourth diode, and the anode of the fourth diode is connected to the RC circuit and the ground.

The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

Please refer to FIG. 2. FIG. 2 is a schematic diagram of an electrostatic discharge protection circuit 3 according to a first embodiment of the present invention. As shown in FIG. 2, the ESD protection circuit 3 includes a plurality of voltage stabilizing circuits 30a, 30b, 30c, ..., 30n, a first diode 32, a second diode 34, a bypass capacitor 36, and a stable The diode 38 is pressed. A plurality of voltage stabilizing circuits 30a-30n are connected in parallel between a power supply terminal VCC and a ground terminal GND. The anode of the first diode 32 is connected to the power supply terminal VCC, and the cathode of the first diode 32 is connected to the plurality of voltage stabilizing circuits 30a-30n. The anode of the second diode 34 is connected to the plurality of voltage stabilizing circuits 30a-30n, and the cathode of the second diode 34 is connected to the ground terminal GND. Bypass One end of the capacitor 36 is connected to the anode of the first diode 32 and the power terminal VCC, and the other end of the bypass capacitor 36 is connected to the cathode of the second diode 34 and the ground GND. One end of the Zener diode 38 is connected to the anode of the first diode 32 and the power terminal VCC, and the other end of the Zener diode 38 is connected to the cathode of the second diode 34 and the ground GND.

In this embodiment, each of the voltage stabilizing circuits 30a, 30b, 30c, ..., 30n includes a Zener diode 300a, 300b, 300c, ..., 300n and a resistor 302a, 302b, 302c, ..., 302n. The resistors 302a-302n are respectively connected between the power supply terminal VCC and the cathode of the Zener diodes 300a-300n, and the anodes of the Zener diodes 300a-300n are respectively connected to the ground terminal GND. In practical applications, if it is considered that only the Zener diodes 300a-300n are separately regulated, and the supply current is less than the demand, the resistors 302a-302n can be added as a current limiting method to protect the Zener diode 300a. -300n is not damaged. The resistance of the resistors 302a-302n is determined by the supply voltage, the regulated voltage, the load current, and the Zener diode current. In addition, in this embodiment, the Zener diodes 300a-300n can be implemented by a generally-called Zener diode; in other embodiments of the present invention, other voltage-regulating effects can be utilized as needed. The electronic components are implemented.

It should be noted that the voltage stabilizing circuits 30a-30n of the present invention are not limited to the circuit architecture illustrated in FIG. 2. For example, if the voltage applied to the Zener diodes 300a-300n is not high, the voltage stabilizing circuits 30a-30n may be regulated only by the Zener diodes 300a-300n without providing the resistors 302a-302n. In addition, the resistors 302a-302n may also be connected in series between the negative terminal of the Zener diodes 300a-300n and the ground GND. In other words, the design of the voltage stabilizing circuits 30a-30n, except that the Zener diodes 300a-300n are basic components, can be adjusted depending on the actual application.

The electrostatic discharge protection circuit 3 shown in FIG. 2 is suitable for the power supply to be DC and static. The case of electricity is the medium and low frequency voltage. Generally, the signal line of the electronic device provided with the ESD protection circuit 3 (such as the RGB signal line, the video graphics array (VGA) signal line or the signal line of other electronic devices in FIG. 1) is connected from the ESD protection circuit 3. The foot 40 is connected. In the ESD protection circuit 3, each of the voltage stabilizing circuits 30a-30n has a voltage regulation value V1-Vn, wherein the voltage regulator circuit of the voltage regulator circuit close to the power terminal VCC and the ground terminal GND is greater than the power source VCC and ground. The voltage regulation value of the voltage regulator circuit of the terminal GND, and each voltage regulation value is greater than the voltage value of the power supply terminal VCC. In other words, in this embodiment, the relationship between the voltage value of the power supply terminal VCC and the regulation voltage values V1 - Vn can be expressed as: VCC < V1 < V2 < V3 < ... < Vn.

The following stages explain the operation principle of the electrostatic discharge protection circuit 3 when the electrostatic voltage is positive.

1. Normal working phase: When the electrostatic voltage is between (VCC-0.7V) and VCC, the circuit works normally, and the electrostatic discharge protection circuit 3 does not operate. It should be noted that the above 0.7V is the input voltage of the general Zener diode, and is for illustrative purposes only, and the present invention is not limited thereto.

2. V1 phase: when the electrostatic voltage is between (VCC+0.7V) and V2, the first diode 32 is turned off, the second diode 34 is turned on, and the Zener diode 300a of the voltage stabilizing circuit 30a is turned on. The electrostatic energy is absorbed by the voltage stabilizing circuit 30a.

3. V2 phase: when the electrostatic voltage is between V2 and V3, the first diode 32 is turned off, and the second diode 34 is turned on. At this time, the Zener diodes 300a and 300b of the voltage stabilizing circuits 30a and 30b are turned on. The electrostatic energy is absorbed by the voltage stabilizing circuits 30a, 30b.

4. V3 stage: when the electrostatic voltage is between V3 and V4, the first diode 32 is turned off, the second diode 34 is turned on, and the Zener diodes 300a, 300b of the voltage stabilizing circuits 30a, 30b, 30c at this time The 300c is sequentially turned on, and the electrostatic energy is absorbed by the voltage stabilizing circuits 30a, 30b, and 30c.

5. The working principle of the V3 to Vn stage is the same, and will not be described here.

The following stages explain the operation principle of the electrostatic discharge protection circuit 3 when the electrostatic voltage is negative.

1. Normal working phase: When the electrostatic voltage is between 0V and -0.7V, the circuit works normally, and the electrostatic discharge protection circuit 3 does not operate.

2. V1 phase: when the electrostatic voltage is between -0.7V and -(V1-VCC), the second diode 34 is turned off, the first diode 32 is turned on, and the Zener diode of the voltage stabilizing circuit 30a is at this time. When 300a is turned on, the electrostatic energy is absorbed by the voltage stabilizing circuit 30a.

3. V2 phase: when the electrostatic voltage is between -(V1-VCC) and -(V2-VCC), the second diode 34 is turned off, and the first diode 32 is turned on, at this time, the voltage stabilizing circuit 30a, The Zener diodes 300a and 300b of 30b are turned on, and the electrostatic energy is absorbed by the voltage stabilizing circuits 30a and 30b.

4. V3 stage: when the electrostatic voltage is between -(V2-VCC) and -(V3-VCC), the second diode 34 is turned off, and the first diode 32 is turned on, at this time, the voltage stabilizing circuit 30a, The Zener diodes 300a, 300b, and 300c of 30b and 30c are sequentially turned on, and the electrostatic energy is absorbed by the voltage stabilizing circuits 30a, 30b, and 30c.

5. The working principle of the V3 to Vn stage is the same, and will not be described here.

In summary, no matter whether the electrostatic voltage is positive or negative, the stronger the electrostatic voltage is, the more the voltage-stabilizing circuit is turned on, as long as the voltage regulation value of the Zener diode 300a-300n of the voltage regulator circuit 30a-30n is set reasonably V1. -Vn, the electrostatic energy is sequentially absorbed by the voltage stabilizing circuits 30a-30n. In addition, when the instantaneous voltage of the static electricity is excessively large, the first diode 32 and the second diode 34 have an isolation effect, thereby ensuring that the entire system can work normally. Furthermore, when static electricity or other energy generates positive and negative voltages in a unit time, most of the energy can be vented or absorbed by the voltage stabilizing circuits 30a-30n, which can effectively prevent large energy from flowing and interfere with the system circuit. In turn, the circuit is safe.

In addition, the bypass capacitor 36 has a filtering effect for filtering noise in the circuit, and the Zener diode 38 is used as a negative voltage clamp protection. When the electronic device is not turned on, if there is external abnormal energy bleed, the Zener diode 38 can clamp the voltage VCC of the power terminal to -0.7V or more to ensure circuit safety.

Please refer to FIG. 3. FIG. 3 is a schematic diagram of an ESD protection circuit 5 according to a second embodiment of the present invention. The main difference between the electrostatic discharge protection circuit 5 and the aforementioned electrostatic discharge protection circuit 3 is that the electrostatic discharge protection circuit 5 further includes an RC circuit 50. As shown in FIG. 3, the RC circuit 50 is connected in parallel with the voltage stabilizing circuits 30a-30n, and the RC circuit 50 is connected between the power supply terminal VCC and the ground terminal GND. It should be noted that the components of the same reference numerals as those shown in FIG. 2 have the same structure and function principle, and are not described herein again. If the electrostatic energy absorbed by the capacitor 500 of the RC circuit 50 is represented by V0, the relationship between the voltage value of V0, the power supply terminal VCC and the voltage regulation value V1-Vn can be expressed as: VCC<V0<V1<V2<V3< ...<Vn.

The electrostatic discharge protection circuit 5 illustrated in FIG. 3 is applied to a case where the power source is direct current and the static electricity is a high frequency voltage (for example, 1 GHz to 2 GHz). The operation of the RC circuit 50 in the electrostatic discharge protection circuit 5 is explained below. When the electrostatic voltage is between (VCC+0.7V) and V0, the first diode 32 is turned off, and the second diode 34 is turned on. At this time, the static electricity passes through the capacitor 500 of the RC circuit 50 and the second diode 34. The capacitor 500 is charged with the ground GND, and after the static electricity is removed, the capacitor 500 discharges the resistor 502. In other words, the static electricity during this period is absorbed by the RC circuit 50.

Therefore, in this embodiment, when an instantaneous positive and negative electrostatic pulse is generated, it is first offset by the time constant of the RC circuit 50. When the instantaneous electrostatic pulse time exceeds the time constant of the RC circuit 50, the positive voltage energy is absorbed by the voltage stabilizing circuits 30a-30n in stages, and converted into harmless low frequency energy, which is synchronously guided to the ground GND, and vice versa. The energy is absorbed by the voltage stabilizing circuits 30a-30n in stages and converted into no Damage to low frequency energy, synchronously diverted to the power supply terminal VCC. In practical applications, the RC circuit 50 can prevent the generation of electrostatic discharge sparks and noise.

Please refer to FIG. 4. FIG. 4 is a schematic diagram of an electrostatic discharge protection circuit 6 according to a third embodiment of the present invention. The main difference between the electrostatic discharge protection circuit 6 and the electrostatic discharge protection circuit 3 described above is that the electrostatic discharge protection circuit 6 further includes a third diode 60 and a fourth diode 62. As shown in FIG. 4, the cathode of the third diode 60 is connected to the voltage stabilizing circuit 30a-30n and the power terminal VCC, and the anode of the third diode 60 is connected to the cathode of the fourth diode 62, and the fourth The anode of the pole tube 62 is connected to the voltage stabilizing circuits 30a-30n and the ground terminal GND. It should be noted that the components of the same reference numerals as those shown in FIG. 2 have the same structure and function principle, and are not described herein again.

The electrostatic discharge protection circuit 6 illustrated in FIG. 4 is applicable to a case where the power source is an alternating current and the static electricity is a medium-low frequency voltage. In this embodiment, regardless of whether the electrostatic voltage is positive or negative, the third diode 60 and the fourth diode 62 are both turned off during the normal operating phase, and the third diode is in the aforementioned V1 to Vn phase. The tube 60 and the fourth diode 62 are turned on, and the static electricity is sequentially absorbed by the voltage stabilizing circuits 30a-30n to achieve the effect of electrostatic discharge protection.

Please refer to FIG. 5. FIG. 5 is a schematic diagram of an electrostatic discharge protection circuit 7 according to a fourth embodiment of the present invention. The main difference between the electrostatic discharge protection circuit 7 and the electrostatic discharge protection circuit 3 described above is that the electrostatic discharge protection circuit 7 further includes an RC circuit 50, a third diode 60, and a fourth diode 62. As shown in FIG. 5, the RC circuit 50 is connected in parallel with the voltage stabilizing circuits 30a-30n, and the RC circuit 50 is connected between the power terminal VCC and the ground GND; the cathode of the third diode 60 is connected to the RC circuit 50 and the power terminal. VCC, the anode of the third diode 60 is connected to the cathode of the fourth diode 62, and the anode of the fourth diode 62 is connected to the RC circuit 50 and the ground GND. It should be noted that the components of the same reference numerals as those shown in FIG. 2 in FIG. 5 have the same structure and function principle. I will not repeat them here.

As described above, since the electrostatic discharge protection circuit 7 has both the RC circuit 50, the third diode 60, and the fourth diode 62, the electrostatic discharge protection circuit 7 is suitable for the power source to be an alternating current and the static electricity to be a high frequency voltage (for example, 1GHz~2GHz).

The aforementioned electrostatic discharge protection circuits 3, 5, 6, and 7 can be applied to any electronic device such as a liquid crystal display, a television, a monitor, a computer, or the like. Please refer to FIG. 6. FIG. 6 is a schematic diagram of an internal circuit of an electronic device having an electrostatic discharge protection circuit 3 according to a fifth embodiment of the present invention. The circuit architecture shown in FIG. 6 is an example of a liquid crystal display, but is not limited thereto. As shown in FIG. 6, the signal source 8 includes a plurality of pins, and each pin is used to output a corresponding signal. In addition, four ESD protection circuits 7 are respectively connected to corresponding pins of the signal source 8 via RGB signal lines and video graphics array (VGA) signal lines. In this embodiment, the four ESD protection circuits 7 share a set of bypass capacitors 36 and Zener diodes 38, as shown in FIG. The structural design and operation principle of the electrostatic discharge protection circuit 7 are as described above, and will not be described herein. It should be noted that the electrostatic discharge protection circuit 7 in FIG. 6 can also be replaced by the aforementioned electrostatic discharge protection circuits 3, 5, and 6 depending on the practical application.

Compared with the prior art, the electrostatic discharge protection circuit of the invention greatly reduces the influence of static electricity on the circuit, improves the anti-interference ability of the electronic device, and makes the performance of the whole machine more stable and reliable, and the circuit itself is simple and flexible, as long as it is reasonable. By designing the voltage value of the Zener diode in each voltage regulator circuit, most of the interference energy can be absorbed.

While the present invention has been described above in terms of the preferred embodiments thereof, it is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The patent protection scope of the invention is subject to the definition of the scope of the patent application attached to the specification.

1, 3, 5, 6, 7‧‧‧ Electrostatic discharge protection circuit

8‧‧‧Signal source

10, 12, 32, 34, 60, 62‧‧ Diodes

14,500‧‧‧ capacitor

16, 18, 20, 40‧‧‧ feet

30a-30n‧‧‧ voltage regulator circuit

36‧‧‧ Bypass capacitor

38, 300a-300n‧‧‧ Zener diode

50‧‧‧RC circuit

302a-302n, 502‧‧‧ resistance

R, G, B, VGA‧‧‧ signal lines

VCC‧‧‧ power terminal

GND‧‧‧ ground

FIG. 1 is a schematic view showing a conventional electrostatic discharge protection circuit applied to a liquid crystal display.

2 is a schematic diagram of an electrostatic discharge protection circuit in accordance with a first embodiment of the present invention.

3 is a schematic diagram of an electrostatic discharge protection circuit in accordance with a second embodiment of the present invention.

4 is a schematic diagram of an electrostatic discharge protection circuit in accordance with a third embodiment of the present invention.

Figure 5 is a schematic diagram of an electrostatic discharge protection circuit in accordance with a fourth embodiment of the present invention.

6 is a schematic diagram of an internal circuit of an electronic device having an electrostatic discharge protection circuit according to a fifth embodiment of the present invention.

3‧‧‧Electrostatic discharge protection circuit

32, 34‧‧‧ diode

40‧‧‧ feet

30a-30n‧‧‧ voltage regulator circuit

36‧‧‧ Bypass capacitor

38, 300a-300n‧‧‧ Zener diode

302a-302n‧‧‧resistance

VCC‧‧‧ power terminal

GND‧‧‧ ground

Claims (20)

An electrostatic discharge protection circuit comprising: a plurality of voltage stabilizing circuits connected in parallel between a power supply terminal and a ground terminal; a first diode, a positive electrode of the first diode is connected to the power supply terminal, and the first a cathode of a diode is connected to the plurality of voltage stabilizing circuits; and a second diode, an anode of the second diode is connected to the plurality of voltage stabilizing circuits, and a cathode of the second diode is connected At the end. The electrostatic discharge protection circuit of claim 1, wherein one of the plurality of voltage stabilizing circuits comprises a Zener diode connected between the power terminal and the ground. The ESD protection circuit of claim 2, wherein the voltage stabilizing circuit further comprises a resistor connected between the power terminal and the Zener diode. The electrostatic discharge protection circuit of claim 1, wherein one of the plurality of voltage stabilizing circuits comprises a Zener diode and a resistor connected to the power supply terminal and the negative electrode of the Zener diode And the anode of the Zener diode is connected to the ground. The electrostatic discharge protection circuit of claim 1, further comprising an RC circuit connected in parallel with the plurality of voltage stabilizing circuits, wherein the RC circuit is connected between the power terminal and the ground terminal. The electrostatic discharge protection circuit of claim 5, further comprising a third diode and a fourth diode, wherein a cathode of the third diode is connected to the RC circuit and the power terminal, The anode of the third diode is connected to the cathode of the fourth diode, and the anode of the fourth diode is connected to the RC circuit and the ground. The electrostatic discharge protection circuit of claim 1, further comprising a third diode and a fourth diode, wherein a cathode of the third diode is connected to the plurality of voltage stabilizing circuits and the power source The anode of the third diode is connected to the cathode of the fourth diode, and the anode of the fourth diode is connected to the plurality of voltage stabilizing circuits and the ground. The ESD protection circuit of claim 1, further comprising a bypass capacitor, one end of the bypass capacitor being connected to the anode of the first diode and the power terminal, and the other end of the bypass capacitor Connected to the negative pole of the second diode and the ground end. The electrostatic discharge protection circuit of claim 1, further comprising a Zener diode, one end of the Zener diode is connected to the anode of the first diode and the power terminal, and the Zener diode is further One end is connected to the negative pole of the second diode and the ground end. The electrostatic discharge protection circuit of claim 1, wherein each of the voltage stabilization circuits has a voltage regulation value, and the voltage regulation value of the voltage regulator circuit adjacent to the power terminal and the ground terminal is greater than the power source away from the power source. The voltage regulator circuit of the terminal and the ground terminal, and each voltage regulation value is greater than a voltage value of the power terminal. An electronic device comprising: a signal source comprising N pins, wherein the N pins are used to output N signals, N is a positive integer; and N electrostatic discharge protection circuits, each of which is respectively connected One of the N pins, each ESD protection circuit includes: a plurality of voltage stabilizing circuits connected in parallel between a power terminal and a ground terminal; a first diode, the first diode An anode of the tube is connected to the power terminal, and a cathode of the first diode is connected to the plurality of voltage regulator circuits; a second diode, the anode of the second diode is connected to the plurality of voltage stabilizing circuits, and a cathode of the second diode is connected to the ground end. The electronic device of claim 11, wherein one of the plurality of voltage stabilizing circuits comprises a Zener diode connected between the power terminal and the ground. The electronic device of claim 12, wherein the voltage stabilizing circuit further comprises a resistor connected between the power terminal and the Zener diode. The electronic device of claim 11, wherein one of the plurality of voltage stabilizing circuits comprises a Zener diode and a resistor connected between the power terminal and a negative terminal of the Zener diode, And the anode of the Zener diode is connected to the ground end. The electronic device of claim 11, wherein each of the ESD protection circuits further comprises an RC circuit, the RC circuit is connected in parallel with the plurality of voltage stabilizing circuits, and the RC circuit is connected to the power terminal and the ground Between the ends. The electronic device of claim 15, wherein each of the electrostatic discharge protection circuits further comprises a third diode and a fourth diode, wherein a negative electrode of the third diode is connected to the RC circuit The power terminal, the anode of the third diode is connected to the cathode of the fourth diode, and the anode of the fourth diode is connected to the RC circuit and the ground. The electronic device of claim 11, wherein each of the electrostatic discharge protection circuits further comprises a third diode and a fourth diode, wherein the negative electrode of the third diode is connected to the plurality of stable The voltage circuit and the power terminal, the anode of the third diode is connected to the cathode of the fourth diode, and the anode of the fourth diode is connected to the plurality of voltage stabilizing circuits and the ground end. An electronic device as claimed in claim 11, wherein each of the electrostatic discharges The electrical protection circuit further includes a bypass capacitor, one end of the bypass capacitor is connected to the anode of the first diode and the power terminal, and the other end of the bypass capacitor is connected to the cathode of the second diode and the Ground. The electronic device of claim 11, wherein each of the ESD protection circuits further includes a Zener diode, one end of the Zener diode is connected to the anode of the first diode and the power terminal, and the The other end of the Zener diode is connected to the cathode of the second diode and the ground. The electronic device of claim 11, wherein each of the voltage stabilizing circuits has a voltage stabilization value, and the voltage regulator circuit of the voltage regulator circuit near the power terminal and the ground terminal is greater than the power source terminal The voltage regulation value of the voltage regulator circuit at the ground end, and each voltage regulation value is greater than the voltage value of the power source terminal.