Adapter circuit with electrostatic protection function and adapter

Abstract

The utility model provides an adapter circuit with an electrostatic protection function and an adapter, the adapter circuit comprises an AC input port, an input rectification filter circuit, a DC-DC conversion circuit, an output rectification filter circuit, a control circuit, a feedback circuit, an electrostatic protection circuit and an output port, the AC input port is connected with the input rectification filter circuit, and the output port is connected with the output rectification filter circuit. The input rectification filter circuit is connected with the input port, the output rectification filter circuit is connected with the output port, the DC-DC conversion circuit is connected between the input rectification filter circuit and the output rectification filter circuit, one end of the feedback circuit is connected with the output rectification filter circuit, and the other end of the feedback circuit is connected with one end of the control circuit through the electrostatic protection circuit. And the other end of the control circuit is connected with the DC-DC conversion circuit.

Description

Technical Field

[0001] This utility model relates to adapter technology, and more particularly to an adapter circuit and adapter with electrostatic discharge protection function. Background Technology

[0002] With the development of adapters and the improvement of industry standards, the requirements for electrostatic discharge (ESD) protection capabilities of adapters are becoming increasingly stringent. However, ordinary adapters on the market do not take into account the wide range and differences in the environments in which they are used, resulting in insufficient ESD protection capabilities that fail to meet user needs. Utility Model Content

[0003] This utility model provides an adapter circuit and an adapter with electrostatic protection function.

[0004] The technical solution of this utility model is implemented as follows:

[0005] This utility model provides an adapter circuit with electrostatic discharge (ESD) protection function. The adapter circuit includes an alternating current (AC) input port, an input rectifier and filter circuit, a direct current-to-direct current (DC-DC) converter circuit, an output rectifier and filter circuit, a control circuit, a feedback circuit, an ESD protection circuit, and an output port. The AC input port is connected to the input rectifier and filter circuit, the output rectifier and filter circuit is connected to the output port, the DC-DC converter circuit is connected between the input rectifier and filter circuit and the output rectifier and filter circuit, one end of the feedback circuit is connected to the output rectifier and filter circuit, and the other end is connected to one end of the control circuit via the ESD protection circuit. The other end of the control circuit is connected to the DC-DC converter circuit.

[0006] In some embodiments, the adapter circuit further includes a chip power supply circuit, one end of which is connected between the input rectifier filter circuit and the DC-DC conversion circuit, and the other end is connected to the control circuit.

[0007] In some embodiments, the control circuit includes a control chip, the control chip includes a feedback (FB) pin, one end of the electrostatic discharge protection circuit is connected to the FB pin, and the other end is connected to the feedback circuit.

[0008] In some embodiments, the feedback circuit includes an optocoupler, the other end of the electrostatic discharge protection circuit is connected to the first output terminal of the optocoupler, and the second output terminal of the optocoupler is grounded.

[0009] In some embodiments, the electrostatic discharge protection circuit includes a first resistor and a second resistor connected in series. One end of the first resistor is connected to the FB pin, and the other end is connected to one end of the second resistor. The other end of the second resistor is connected to the first output terminal of the optocoupler.

[0010] In some embodiments, the electrostatic discharge protection circuit further includes a Zener diode, one end of which is connected between the first resistor and the second resistor, and the other end is grounded.

[0011] In some embodiments, the electrostatic discharge protection circuit further includes a capacitor, one end of which is connected between the second resistor and the first output terminal of the optocoupler, and the other end is grounded.

[0012] In some embodiments, the adapter circuit further includes a fuse connected between the AC input port and the input rectifier filter circuit.

[0013] In some embodiments, the input rectifier filter circuit includes a rectifier bridge, the input terminal of which is connected to the fuse.

[0014] This utility model also provides an adapter, which includes one or more of the aforementioned adapter circuits with electrostatic protection function.

[0015] This utility model provides an adapter circuit and an adapter with electrostatic discharge (ESD) protection function. The adapter circuit includes an AC input port, an input rectifier and filter circuit, a DC-DC converter circuit, an output rectifier and filter circuit, a control circuit, a feedback circuit, an ESD protection circuit, and an output port. The AC input port is connected to the input rectifier and filter circuit, the output rectifier and filter circuit is connected to the output port, the DC-DC converter circuit is connected between the input rectifier and filter circuit and the output rectifier and filter circuit, one end of the feedback circuit is connected to the output rectifier and filter circuit, and the other end is connected to one end of the control circuit via the ESD protection circuit. The other end of the control circuit is connected to the DC-DC converter circuit.

[0016] As can be seen, in this utility model, by adding an electrostatic discharge protection circuit between the feedback circuit and the control circuit, the interference of electrostatic energy on the control circuit can be reduced, and the electrostatic discharge protection capability of the adapter circuit can be enhanced. If this adapter circuit is applied to the adapter, it can ensure that the adapter is not easily affected by electrostatic interference during operation, improve the stability of the adapter, and meet the user's needs. Attached Figure Description

[0017] Figure 1 An application scenario diagram of the adapter circuit with electrostatic protection function provided by this utility model;

[0018] Figure 2 A first structural schematic diagram of the adapter circuit with electrostatic protection function provided by this utility model;

[0019] Figure 3 A schematic diagram of the second structure of the adapter circuit with electrostatic protection function provided by this utility model;

[0020] Figure 4 A third structural schematic diagram of the adapter circuit with electrostatic protection function provided by this utility model;

[0021] Figure 5 A schematic diagram of the electrostatic discharge structure of the electrostatic protection circuit provided by this utility model;

[0022] Figure 6 This is a schematic diagram of the structure of an adapter provided by this utility model.

[0023] Explanation of reference numerals in the attached diagram: 1. Adapter circuit; 10. AC input port; 11. Input rectifier and filter circuit; 12. DC-DC conversion circuit; 13. Output rectifier and filter circuit; 14. Control circuit; 15. Feedback circuit; 16. Electrostatic protection circuit; 17. Output port; 18. Chip power supply circuit; 2. Adapter; 20. AC power supply; 21. Electrical equipment. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0025] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0026] Figure 1 An application scenario diagram of the adapter circuit with electrostatic protection function provided by this utility model is shown, such as... Figure 1 As shown, adapter circuit 1 can be applied to adapter 2; wherein, adapter 2 can be used in a charging scenario, in which one end of adapter 2 is connected to AC power supply 20 and the other end is connected to electrical device 21.

[0027] Here, the voltage range of AC power supply 20 is not specifically limited; for example, it can be AC ​​power from 100V to 240V.

[0028] In this utility model, the type of electrical equipment 21 is not specifically limited; for example, electrical equipment 21 may include, but is not limited to, devices that need to be charged, such as mobile phones, computers and tablets.

[0029] As can be seen, in this utility model, if the adapter 2 is applied to a charging scenario, the adapter 2 can obtain AC power from the AC power source 20, convert the AC power into DC power of a suitable voltage, and transmit the DC power to the electrical device 21 for charging.

[0030] Below Figure 1 Based on this, the circuit structure of adapter circuit 1 will be described by way of example.

[0031] Figure 2 A schematic diagram of an adapter circuit with electrostatic discharge protection function provided by this utility model is shown below. Figure 2 As shown, the adapter circuit 1 includes an AC input port 10, an input rectifier and filter circuit 11, a DC-DC converter circuit 12, an output rectifier and filter circuit 13, a control circuit 14, a feedback circuit 15, an electrostatic discharge protection circuit 16, and an output port 17. The AC input port 10 is connected to the input rectifier and filter circuit 11, the output rectifier and filter circuit 13 is connected to the output port 17, the DC-DC converter circuit 12 is connected between the input rectifier and filter circuit 11 and the output rectifier and filter circuit 13, one end of the feedback circuit 15 is connected to the output rectifier and filter circuit 13, and the other end is connected to one end of the control circuit 14 via the electrostatic discharge protection circuit 15. The other end of the control circuit 14 is connected to the DC-DC converter circuit 12.

[0032] In this invention, the AC input port 10, also known as the AC input terminal, is used to receive AC power output from the AC power supply 20; here, the AC power can be AC ​​mains power, i.e., 220V AC power.

[0033] For example, the function of the input rectifier filter circuit 11 is to convert the alternating current received by the AC input port 10 into direct current. At this time, the direct current is high voltage direct current.

[0034] For example, the DC-DC conversion circuit 12 is used to convert high-voltage DC to low-voltage DC; for example, the DC-DC conversion circuit 12 can convert a high-voltage DC (such as 200V) to a low-voltage DC (such as 20V); the output rectifier filter circuit 13 is used to filter out the ripple component in the low-voltage DC, so that the output DC voltage is more stable.

[0035] For example, the function of the feedback circuit 15 is to feed back the voltage change of the output rectifier and filter circuit 13 to the control circuit 14, so that the control circuit 14 adjusts its own working state according to the feedback voltage change, thereby regulating the output DC voltage and playing a dynamic voltage stabilization role.

[0036] In this invention, by setting an electrostatic protection circuit 16 between the feedback circuit 15 and the control circuit 14, the interference of electrostatic energy entering from the feedback circuit 15 on the control circuit 14 can be reduced, ensuring the stable operation of the adapter circuit 1.

[0037] For example, Figure 3 This is a schematic diagram of the second structure of the adapter circuit with electrostatic protection function provided by this utility model. (See attached diagram) Figure 3 The adapter circuit 1 may also include a chip power supply circuit 18, one end of which is connected between the input rectifier filter circuit 11 and the DC-DC conversion circuit 12, and the other end is connected to the control circuit 14.

[0038] In this utility model, the control circuit 14 includes a control chip, also known as a microcontroller unit (MCU) chip. Here, the model and packaging of the MCU chip are not specifically limited.

[0039] For example, the control chip includes a VDD pin, which is the power supply pin of the control chip for receiving external power supply; the chip power supply circuit 18 is connected to the VDD pin of the control chip for providing the required voltage to the control chip.

[0040] Figure 4 This is a third structural diagram of the adapter circuit with electrostatic protection function provided by this utility model, as shown in the figure. Figure 4 As shown, the adapter circuit 1 also includes a fuse F1, which is connected between the AC input port 10 and the input rectifier and filter circuit 11. The input rectifier and filter circuit 11 includes a rectifier bridge BD1, wherein the input end of the rectifier bridge BD1 is connected to the fuse F1, and the output end is connected to the DC-DC conversion circuit 12 and the chip power supply circuit 18.

[0041] For example, fuse F1 is used to provide protection in case of abnormal current, and rectifier bridge BD1 includes four diodes that can convert the positive and negative half-cycles of alternating current into positive and reverse direct current, respectively.

[0042] In some embodiments, see Figure 4 The control circuit 14 includes a control chip U1, which includes an FB pin. One end of the electrostatic discharge protection circuit 16 is connected to the FB pin of the control chip U1, and the other end is connected to the feedback circuit 15.

[0043] For example, the FB pin is the feedback pin of the control chip U1, which is used to monitor the circuit output voltage and provide feedback to achieve stable control of the output voltage.

[0044] In some embodiments, the feedback circuit 15 includes an optocoupler U4 (corresponding to...) Figure 4 In the circuit, U4A and U4B are connected to the first output terminal of optocoupler U4 (corresponding to the first output terminal of optocoupler U4). One end of the electrostatic discharge protection circuit 16 is connected to the FB pin, and the other end is connected to the first output terminal of optocoupler U4 (corresponding to the first output terminal of optocoupler U4). Figure 4 Connect pin 4 of U4A in the optocoupler to the second output terminal (corresponding to...). Figure 4 The third pin of U4A in the circuit is grounded.

[0045] In some embodiments, the electrostatic discharge protection circuit 16 may include a first resistor R1 and a second resistor R2 connected in series. One end of the first resistor R1 is connected to the FB pin of the control chip U1, and the other end is connected to one end of the second resistor R2. The other end of the second resistor R2 is connected to the first output terminal (pin 4 of U4A) of the optocoupler.

[0046] Here, the values ​​of the first resistor R1 and the second resistor R2 can be determined according to the actual situation. This utility model does not make a specific limitation on this. For example, the values ​​of the first resistor R1 and the second resistor R2 can both be 47Ω.

[0047] As can be seen, in this utility model, by setting two resistors between the optocoupler and the FB pin of the control chip U1, the electrostatic energy entering the output port can be divided and current limited, reducing the interference of electrostatic energy on the control chip U1 and improving circuit stability.

[0048] In some embodiments, the electrostatic discharge protection circuit 16 may further include a Zener diode ZD1, one end of which is connected between a first resistor R1 and a second resistor R2, and the other end is grounded.

[0049] Here, the value of the reference voltage for Zener diode ZD1 can be determined according to the actual situation. This invention does not impose a specific limitation on this. For example, the reference voltage can be 6.2V.

[0050] For example, by setting a Zener diode ZD1 in the circuit, after the second resistor R2 performs the first stage of voltage division and current limiting on the electrostatic energy, the overvoltage after current limiting is discharged to ground, further reducing the interference of electrostatic energy on the control chip U1.

[0051] In some embodiments, the electrostatic discharge protection circuit 16 may further include a capacitor C9, one end of which is connected between the second resistor R2 and the first output terminal (pin 4 of U4A) of the optocoupler, and the other end is grounded.

[0052] Here, the values ​​of capacitance and voltage rating of capacitor C9 can be determined according to the actual situation. This utility model does not make specific limitations on this. For example, the capacitance of capacitor C9 can be 470pF and the voltage rating can be 50V.

[0053] For example, capacitor C9 in electrostatic discharge protection circuit 16 can serve as a first-stage bypass to discharge electrostatic energy to ground; for ease of understanding, the following describes... Figure 5 The electrostatic discharge process of the electrostatic protection circuit 16 is illustrated by way of example.

[0054] For example, Figure 5 This is a schematic diagram of the electrostatic discharge structure of the electrostatic protection circuit provided by this utility model, combined with... Figure 4 and Figure 5 It can be seen that electrostatic energy will pass through the optocoupler U4 from the output port 17 and reach the FB pin of the control chip U1. If no electrostatic protection circuit is set, the electrostatic energy will interfere with the FB pin of the control chip U1, thereby affecting the operational stability of the adapter circuit 1. In this utility model, by adding a capacitor C9 (470pF / 50V) near the 3rd and 4th pins of the optocoupler U4, the electrostatic energy is discharged to ground as the first-stage bypass. Then, the first-stage voltage divider and current limit are performed through the second resistor R2 (47Ω). Next, the overvoltage of the second stage is discharged to ground through the Zener diode ZD1 (6.2V). Finally, the second-stage voltage divider and current limit are performed through the first resistor R1 (47Ω).

[0055] It can be seen that in this utility model, through Figure 5 The electrostatic discharge path shown can reduce the interference of electrostatic energy on the control chip U1 layer by layer, ensuring the normal and stable operation of the adapter circuit.

[0056] This utility model also provides an adapter 2, such as Figure 6 As shown, the adapter 2 includes the adapter circuit 1 of any of the above schemes.

[0057] As described in the foregoing embodiments, the adapter circuit includes an AC input port, an input rectifier and filter circuit, a DC-DC converter circuit, an output rectifier and filter circuit, a control circuit, a feedback circuit, an electrostatic discharge (ESD) protection circuit, and an output port. The AC input port is connected to the input rectifier and filter circuit, the output rectifier and filter circuit is connected to the output port, the DC-DC converter circuit is connected between the input rectifier and filter circuit and the output rectifier and filter circuit, one end of the feedback circuit is connected to the output rectifier and filter circuit, and the other end is connected to one end of the control circuit via the ESD protection circuit. The other end of the control circuit is connected to the DC-DC converter circuit.

[0058] As in the aforementioned embodiments, the adapter circuit further includes a chip power supply circuit, one end of which is connected between the input rectifier and filter circuit and the DC-DC conversion circuit, and the other end is connected to the control circuit.

[0059] As in the aforementioned embodiments, the control circuit includes a control chip, the control chip includes an FB pin, one end of the electrostatic discharge protection circuit is connected to the FB pin, and the other end is connected to the feedback circuit.

[0060] As in the aforementioned embodiments, the feedback circuit includes an optocoupler, the other end of the electrostatic protection circuit is connected to the first output terminal of the optocoupler, and the second output terminal of the optocoupler is grounded.

[0061] As in the aforementioned embodiment, the electrostatic discharge protection circuit includes a first resistor and a second resistor connected in series. One end of the first resistor is connected to the FB pin, and the other end is connected to one end of the second resistor. The other end of the second resistor is connected to the first output terminal of the optocoupler.

[0062] As in the aforementioned embodiments, the electrostatic protection circuit further includes a Zener diode, one end of which is connected between the first resistor and the second resistor, and the other end is grounded.

[0063] As in the aforementioned embodiment, the electrostatic discharge protection circuit further includes a capacitor, one end of which is connected between the second resistor and the first output terminal of the optocoupler, and the other end is grounded.

[0064] As in the aforementioned embodiment, the adapter circuit further includes a fuse connected between the AC input port and the input rectifier and filter circuit.

[0065] As in the aforementioned embodiment, the input rectifier filter circuit includes a rectifier bridge, and the input terminal of the rectifier bridge is connected to the fuse.

[0066] It should be noted that the relevant circuit structure diagrams provided in this utility model are not limited to those described above. Figure 4 , Figure 5 The circuit structure described herein is not limited by this utility model.

[0067] The above are merely embodiments of this utility model, but do not limit the patent scope of this utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

[0068] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of the present invention, the sequence number of the above-described processes does not imply a sequential order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the present invention. The above-described sequence numbers are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0069] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An adapter circuit with electrostatic discharge protection function, characterized in that, The adapter circuit includes an AC input port, an input rectifier and filter circuit, a DC-DC converter circuit, an output rectifier and filter circuit, a control circuit, a feedback circuit, an electrostatic discharge (ESD) protection circuit, and an output port. The AC input port is connected to the input rectifier and filter circuit, the output rectifier and filter circuit is connected to the output port, the DC-DC converter circuit is connected between the input rectifier and filter circuit and the output rectifier and filter circuit, one end of the feedback circuit is connected to the output rectifier and filter circuit, and the other end is connected to one end of the control circuit via the ESD protection circuit. The other end of the control circuit is connected to the DC-DC converter circuit.

2. The adapter circuit according to claim 1, characterized in that, The adapter circuit also includes a chip power supply circuit, one end of which is connected between the input rectifier and filter circuit and the DC-DC converter circuit, and the other end is connected to the control circuit.

3. The adapter circuit according to claim 1, characterized in that, The control circuit includes a control chip, which includes an FB pin. One end of the electrostatic discharge protection circuit is connected to the FB pin, and the other end is connected to the feedback circuit.

4. The adapter circuit according to claim 3, characterized in that, The feedback circuit includes an optocoupler, the other end of the electrostatic protection circuit is connected to the first output terminal of the optocoupler, and the second output terminal of the optocoupler is grounded.

5. The adapter circuit according to claim 4, characterized in that, The electrostatic discharge protection circuit includes a first resistor and a second resistor connected in series. One end of the first resistor is connected to the FB pin, and the other end is connected to one end of the second resistor. The other end of the second resistor is connected to the first output terminal of the optocoupler.

6. The adapter circuit according to claim 5, characterized in that, The electrostatic discharge protection circuit also includes a Zener diode, one end of which is connected between the first resistor and the second resistor, and the other end is grounded.

7. The adapter circuit according to claim 6, characterized in that, The electrostatic discharge protection circuit also includes a capacitor, one end of which is connected between the second resistor and the first output terminal of the optocoupler, and the other end is grounded.

8. The adapter circuit according to claim 1, characterized in that, The adapter circuit also includes a fuse connected between the AC input port and the input rectifier and filter circuit.

9. The adapter circuit according to claim 8, characterized in that, The input rectifier filter circuit includes a rectifier bridge, and the input terminal of the rectifier bridge is connected to the fuse.

10. An adapter, characterized in that, The adapter includes the adapter circuit with electrostatic discharge protection function as described in any one of claims 1-9.

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