CN219576858U - Power module and electronic equipment - Google Patents

Abstract

The utility model provides a power supply module and electronic equipment, wherein the power supply module comprises an EMC protection circuit, a rectifying circuit, a pi-shaped filter circuit, a direct current conversion circuit and a semiconductor discharge tube, and the EMC protection circuit is used for being connected with an alternating current power grid. The rectifying circuit is connected with the EMC protection circuit, the input end of the pi-type filter circuit is connected with the rectifying circuit, the output end of the pi-type filter circuit is connected with the direct current conversion circuit, and the semiconductor discharge tube is connected with the input end and the output end of the pi-type filter circuit.

Description

Power module and electronic equipment

Technical Field

The present utility model relates to the field of power technologies, and in particular, to a power module and an electronic device.

Background

AC-DC (Alternating Current to Direct Current, AC-DC) switching power supplies are often connected to a power grid for converting AC power from the power grid to DC power. AC-DC switching power supplies are typically provided with a rectifier bridge, pi-type filters, and chopper circuits. In order to solve the problem that the circuit/device is easy to be damaged by the surge voltage of the power grid, an anti-surge circuit is usually arranged on the input side of the AC-DC switching power supply, namely, the front stage of the rectifier bridge. However, the input side anti-surge circuit can only limit the surge voltage to a low level, and the surge residual voltage is still high for the switching tube in the post-stage chopper circuit. Therefore, a large capacity capacitor is required to be arranged at the rear stage of the rectifier bridge or other measures are taken to further reduce the surge residual voltage so as to protect the switching tube from being damaged in a surge scene.

However, the currently adopted measures for reducing the surge residual voltage still have the defects that, for example, a large occupied area is needed or the performance of other devices or circuits in the AC-DC switching power supply is affected, so that effective solving measures are needed to be proposed.

Disclosure of Invention

In view of the above, the utility model provides a power module and an electronic device, which can solve the problem of too high surge voltage at the output end of a pi-type filter circuit caused by the surge voltage of an alternating current power grid, protect a post-stage circuit, and have the advantages of low cost, small occupied area, easy realization and wide application range.

In a first aspect, the present utility model provides a power module including an EMC protection circuit, a rectifier circuit, a pi-filter circuit, a dc conversion circuit, and a semiconductor discharge tube. The EMC protection circuit can be used for being connected with an alternating current power grid so as to access alternating current. The rectifying circuit is connected with the EMC protection circuit and can be used for converting alternating current into first direct current. The input end of the pi-type filter circuit is connected with the rectifying circuit, the output end of the pi-type filter circuit is connected with the direct current conversion circuit, and the pi-type filter circuit can be used for filtering the first direct current. The direct current conversion circuit is operable to convert the filtered first direct current to a second direct current. The semiconductor discharge tube is connected with the input end and the output end of the pi-type filter circuit, and can be used for being conducted when the voltage of the input end of the pi-type filter circuit is larger than the voltage of the output end of the pi-type filter circuit and the voltage difference between the input end voltage and the output end voltage is not smaller than a preset threshold value, so that the input end and the output end of the pi-type filter circuit can be communicated through the conducted semiconductor discharge tube.

It can be understood that when the surge voltage of the ac power grid enters the power module, the voltage at the output end of the pi-type filter circuit is raised, so that the threat of overstress failure of devices is caused to the subsequent dc conversion circuit. The semiconductor discharge tube is connected in parallel between the input end and the output end of the pi-type filter circuit, so that when surge voltage raises the voltage difference between the input end and the output end of the pi-type filter circuit to be greater than or equal to a preset threshold value, the semiconductor discharge tube is conducted rapidly, and the input end and the output end of the pi-type filter circuit are communicated through the conducted semiconductor discharge tube. Based on the design, the surge voltage can not raise the voltage of the output end of the pi-type filter circuit, so that the risk of overstress failure of devices of a later-stage circuit can be effectively reduced.

In one possible design, the pi-type filter circuit includes a first capacitor unit, a second capacitor unit, and a differential-mode inductor unit, where a connection end of the first capacitor unit forms an input end of the pi-type filter circuit, a connection end of the second capacitor unit forms an output end of the pi-type filter circuit, the first capacitor unit is connected in parallel with the second capacitor unit, and the differential-mode inductor unit is connected between the first capacitor unit and the second capacitor unit, that is, the differential-mode inductor unit is connected in parallel with the semiconductor discharge tube. It can be understood that when the surge voltage of the ac power grid enters the power module, the first capacitor unit and the differential mode inductance unit of the pi-type filter circuit are charged, and the energy stored by charging the differential mode inductance unit is further released to the second capacitor unit, so that the voltage of the second capacitor unit is raised, and the threat of overstress failure of devices is further caused to the subsequent dc conversion circuit. In the utility model, the semiconductor discharge tube is connected in parallel with the differential mode inductance unit, so that the semiconductor discharge tube can be rapidly conducted when the surge voltage charges the first capacitance unit and the voltage of the first capacitance unit is larger than the voltage of the second capacitance unit by a preset threshold value. Based on the design, the conducted semiconductor discharge tube can short-circuit the differential-mode inductance unit and communicate the second capacitance unit with the first capacitance unit, so that the differential-mode inductance unit is prevented from being charged by surge residual voltage, the differential-mode inductance unit cannot charge the second capacitance unit, the voltage of the second capacitance unit cannot be raised, the problem that the overstress of a device of a rear-stage circuit is invalid due to the fact that the voltage of the second capacitance unit is too high is solved at the source, and breakdown and damage of the second capacitance unit can be prevented.

In one possible design, after the semiconductor discharge tube is turned on, the voltage at two ends of the turned-on semiconductor discharge tube is clamped to be 0, the second capacitor unit and the first capacitor unit are connected into a passage through the turned-on semiconductor discharge tube, the energy stored by charging the first capacitor unit can be released to the second capacitor unit through the turned-on semiconductor discharge tube, and finally the voltage of the first capacitor unit and the voltage of the second capacitor unit can be equal.

In one possible design, the semiconductor discharge tube is designed to be disconnected when the voltage difference between the input voltage and the output voltage is smaller than a preset threshold value.

In one possible design, the dc conversion circuit is of single-stage construction, i.e. the dc conversion circuit is a single-stage dc-dc converter.

In one possible design, in the case of a single-stage structure of the dc conversion circuit, the capacitance value of the first capacitance unit is greater than the capacitance value of the second capacitance unit. Based on the design, the first direct current output by the rectifying circuit can be subjected to low-frequency filtering through the first capacitance unit, and then subjected to high-frequency differential mode filtering through the differential mode inductance unit and the second capacitance unit. Therefore, the filtered first direct current can be purer and smoother.

In one possible design, the dc conversion circuit is a multi-stage structure and may include a power factor correction circuit and a dc-dc converter, the power factor correction circuit is connected to the output end of the pi-type filter circuit and the dc-dc converter, and a third capacitor unit is further connected between the power factor correction circuit and the dc-dc converter.

In one possible design, in the case where the dc conversion circuit has the multi-stage structure, the capacitance values of the first capacitor unit and the second capacitor unit are smaller than the capacitance value of the third capacitor unit. Based on the design, the first direct current output by the rectifying circuit can be filtered through the first capacitance unit, and then high-frequency differential mode filtering is performed through the differential mode inductance unit and the second capacitance unit. After the filtered first direct current passes through the PFC circuit, the third capacitor unit performs low-frequency filtering. Therefore, after being filtered by the pi-type filter circuit and the third capacitor unit, the first direct current can be purer and smoother, and the DC-DC converter can output stable second direct current.

In a second aspect, the present utility model further provides an electronic device, configured to supply power to a terminal device. The electronic equipment comprises a power supply module, wherein the power supply module comprises a semiconductor discharge tube, and an EMC protection circuit, a rectifying circuit, a pi-type filter circuit and a direct current conversion circuit which are sequentially connected, the semiconductor discharge tube is connected with the input end and the output end of the pi-type filter circuit, and is used for being conducted when the voltage of the input end of the pi-type filter circuit is larger than the voltage of the output end of the pi-type filter circuit, and the voltage difference between the voltage of the input end and the voltage of the output end is not smaller than a preset threshold value, so that the input end and the output end of the pi-type filter circuit are communicated through the conducted semiconductor discharge tube.

In one possible design, the electronic device includes a charger or a power adapter.

In addition, the technical effects caused by any possible implementation manner of the second aspect may refer to the technical effects caused by different implementation manners of the first aspect, which are not described herein.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are required to be used in the description of the embodiments will be briefly described below.

Fig. 1A is a schematic diagram of an AC-DC switching power supply.

Fig. 1B is another schematic diagram of an AC-DC switching power supply.

Fig. 1C is a schematic diagram of one measure of reducing surge residual voltage commonly used in AC-DC switching power supplies.

Fig. 1D is a schematic diagram of another measure of reducing surge residual voltage commonly used in AC-DC switching power supplies.

Fig. 1E is a schematic diagram of another measure of reducing surge residual voltage commonly used in AC-DC switching power supplies.

Fig. 1F is a schematic diagram of another measure of reducing surge residual voltage commonly used in AC-DC switching power supplies.

Fig. 2 is a schematic diagram of a power module according to an embodiment of the utility model.

Fig. 3 is a schematic circuit diagram of the power module shown in fig. 2.

Fig. 4 is another circuit schematic of the power module of fig. 2.

Fig. 5 is a schematic diagram of an electronic device according to an embodiment of the present utility model.

Description of the Main reference signs Power supply Module 10

EMC protection circuit 11

Rectifying circuit 12

Pi-type filter circuit 13

First capacitor unit 131

Second capacitance unit 132

Differential mode inductance unit 133

DC conversion circuit 14

PFC circuit 141

DC-DC converter 142

Third capacitance unit 143

Semiconductor discharge tube 15

Electronic device 100

AC power grid 200

Terminal device 300

The utility model will be further described in the following detailed description in conjunction with the above-described figures.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.

It is understood that the connection relationship described in the present utility model refers to direct or indirect connection. For example, the connection between a and B may be a direct connection between a and B, or an indirect connection between a and B through one or more other electrical components, for example, a direct connection between a and C, and a direct connection between C and B, so that a connection between a and B is achieved through C. It is also understood that "a-connection B" as described herein may be a direct connection between a and B, or an indirect connection between a and B via one or more other electrical components.

In the description of the present utility model, the words "first", "second", "third", etc. are used merely to distinguish different objects, and are not limited in number and order of execution, and the words "first", "second", "third", etc. are not necessarily different. Furthermore, the terms "comprising," "including," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion.

With the rapid development of semiconductor technology, the problem of electromagnetic compatibility (Electromagnetic Compatibility, EMC) of switching power supplies is attracting attention and importance. EMC refers to the ability of a device or system to function properly in its electromagnetic environment without electromagnetic disturbance that cannot be tolerated by any physical components in the environment. EMC comprises two major items: electromagnetic interference (Electro Magnetic Interference, EMI) and electromagnetic immunity (Electro Magnetic Susceptibility, EMS). The EMS refers to the capability of the device or system to resist interference in its electromagnetic environment, mainly including electrostatic immunity test (Electrostatic Discharge, ESD), electric fast transient burst immunity test (Electrical Fast Transient, EFT), voltage sag, short break and Voltage change immunity test (Voltage Dips, interruption and Variation, DIP), surge immunity test (merge), etc. At present, certain requirements are required for EMS in the admission authentication of switch power supply products.

For example, in an alternating current-direct current (Alternating Current to Direct Current, AC-DC) switching power supply, a rectifier bridge, a pi-filter, and a chopper circuit are often provided. The chopper circuit may be a direct current-direct current (Direct Current to Direct Current, DC-DC) converter (see fig. 1A), or a circuit composed of a power factor correction (Power Factor Correction, PFC) circuit and a DC-DC converter (see fig. 1B). The pi filter is composed of capacitances C01, C02 and inductance L01. Since the AC-DC switching power supplies shown in fig. 1A and 1B are connected to the power grid, an anti-surge circuit is usually further required to be disposed on the input side of the AC-DC switching power supply, that is, the front stage of the rectifier bridge, so as to prevent damage to circuits/devices caused by excessive surge voltage of the power grid.

However, in fig. 1A and 1B, the front stage of the chopper circuit performs filtering with only a small capacity of the capacitor C02. When the surge voltage is input, the surge voltage charges the inductor L01, and the energy stored in the inductor L01 is released to the capacitor C02 of the later stage to charge the capacitor C02, so that the voltage of the capacitor C02 is raised again, and the overstress of a switching tube in the later stage DC-DC converter is invalid. It can be seen that this approach can only limit the surge voltage to a low level, and the surge residual voltage is still relatively high for the switching tubes in the following chopper circuit. Therefore, a corresponding circuit is required to be arranged at the rear stage of the rectifying circuit or corresponding measures are required to further reduce the surge residual voltage so as to protect the switching tube from being damaged in a surge scene.

The conventional measures for reducing surge residual voltage can be seen in fig. 1C to 1F.

Specifically, in fig. 1C, the AC-DC switching power supply is additionally provided with a varistor MOV1 connected in parallel with the capacitor C02 to clamp the voltage of the capacitor C02, however, since the varistor has a nonlinear volt-ampere characteristic and the clamp voltage is not fixed, the clamping effect of the varistor MOV1 on the capacitor C02 is not good. Moreover, the piezoresistors are large in size, so that the occupied area is large, and the power density of the AC-DC switching power supply is not good.

In fig. 1D, an RCD clamping circuit (consisting of a resistor R01, a capacitor C03, and a diode D5) is added to the AC-DC switching power supply to be connected in parallel with the capacitor C02, so as to clamp the voltage of the capacitor C02. However, the voltage clamping effect of the RCD clamp on the capacitor C02 is related to the capacitance of the capacitor C03 in the RCD clamp, and a larger capacitance is generally required, which results in a larger footprint of the RCD clamp and is disadvantageous for power density.

In fig. 1E, a diode D6 is added to the AC-DC switching power supply, where an anode of the diode D6 is connected to the capacitor C01, and the diode D6 is connected to the capacitor C03. Thus, the surge voltage can be directly released to the capacitor C03 through the diode D6, and the purpose of suppressing the voltage of the capacitor C02 is achieved. However, this allows high frequency noise to be coupled to the inductor L01 through the parasitic capacitance of the diode D6, thereby reducing the filtering effect of the pi filter.

In fig. 1F, a diode D7 is added to the AC-DC switching power supply, an anode of the diode D7 is connected to the capacitor C02, and a cathode of the diode D7 is connected to the capacitor C03. In this way, the energy stored in the inductor L01 can be released to the capacitor C03 through the diode D7, thereby suppressing the voltage of the capacitor C02. However, this allows for a larger stress spike on the capacitor C01.

Obviously, the measures for reducing the surge residual voltage are insufficient, so that effective solving measures are needed to be proposed.

In this regard, the embodiment of the utility model provides a power module and electronic equipment, which can solve the problem of too high surge voltage at the output end of a pi-type filter circuit caused by the surge voltage of an alternating current power grid, protect a later-stage circuit, and have the advantages of low cost, small occupied area, easy realization and wide application range.

The technical scheme of the utility model is further described in detail below with reference to the accompanying drawings.

Referring to fig. 2, fig. 2 is a schematic diagram of a power module 10 according to an embodiment of the utility model. It will be appreciated that the power module 10 may be used to connect to an AC power grid 200 and perform AC-DC conversion functions.

Specifically, as shown in fig. 2, the power supply module 10 includes an EMC protection circuit 11, a rectifying circuit 12, and a dc conversion circuit 14.

Wherein the EMC protection circuit 11 is connected to the ac power grid 200, and the EMC protection circuit 11, the rectifying circuit 12, and the dc conversion circuit 14 are connected in this order.

Therefore, the EMC protection circuit 11 can be connected to the ac power of the ac power grid 200, and suppress the surge current and the surge voltage of the ac power grid 200 to protect the rectifier circuit 12 and the dc conversion circuit 14 at the subsequent stage. The rectifying circuit 12 may rectify the ac power passing through the EMC protection circuit 11 into a first dc power, and the dc conversion circuit 14 may convert the first dc power into a second dc power.

It will be appreciated that the embodiment of the present utility model does not limit the EMC protection circuit 11 at all, as long as the EMC protection circuit 11 can realize the corresponding functions. For example, the EMC protection circuit 11 may include a filter circuit, a fuse, and a varistor, where the filter circuit may filter electromagnetic interference, and the fuse and the varistor may perform overload protection.

It is to be understood that the rectifying circuit 12 may be any circuit capable of performing an AC-DC conversion function, and is not particularly limited herein. For example, the rectifier circuit 12 may employ a rectifier bridge (see fig. 3 and 4).

Similarly, the DC conversion circuit 14 may be any circuit capable of performing a DC-DC conversion function, and is not particularly limited herein. By way of example, the direct current conversion circuit 14 may be a DC-DC converter, i.e., the direct current conversion circuit 14 is of a single-stage structure (see fig. 3). As another example, the DC conversion circuit 14 may have a multi-stage structure, for example, a two-stage structure, and may include a PFC circuit 141 and a DC-DC converter 142 (see fig. 4). The PFC circuit 141 may be, for example, a BOOST (BOOST) PFC circuit or other circuits capable of power factor correction, which is not limited herein. The DC-DC converter 142 may employ, for example, a BUCK (BUCK) circuit, a BOOST (BOOST) circuit, or a BUCK-BOOST (BUCK-BOOST) circuit, and is not limited in any way herein.

In the embodiment of the present utility model, considering that the first dc power output by the rectifying circuit 12 may have a voltage spike, in order to make the first dc power purer and smoother, please refer to fig. 2 again, the power module 10 further includes a pi-type filtering circuit 13.

Specifically, the pi-type filter circuit 13 is disposed between the rectifying circuit 12 and the dc conversion circuit 14, wherein an input end of the pi-type filter circuit 13 is connected to the rectifying circuit 12, and an output end of the pi-type filter circuit 13 is connected to the dc conversion circuit 14. In this way, the pi-type filter circuit 13 may filter the first direct current and transmit the filtered first direct current to the direct current conversion circuit 14.

Referring to fig. 3 and fig. 4, the pi-type filter circuit 13 may include a first capacitor unit 131, a second capacitor unit 132, and a differential mode inductance unit 133.

It is understood that the first capacitor unit 131 may be one capacitor, or may include a plurality of capacitors connected to each other. Therefore, the number of capacitors in the first capacitor unit 131 does not constitute a limitation of the first capacitor unit 131 according to the embodiment of the present utility model. Also, the capacitance value of the first capacitance unit 131 may be set according to the actual situation, which is not particularly limited herein.

The structure of the second capacitor unit 132 is the same as or similar to that of the first capacitor unit 131, and will not be described here again. The capacitance value of the first capacitance unit 131 may be greater than the capacitance value of the second capacitance unit 132. For convenience of description, fig. 3 and fig. 4 each illustrate the first capacitor unit 131 as the capacitor C1, and the second capacitor unit 132 as the capacitor C2.

Similarly, the number of inductances and the magnitude of the inductance values in the differential-mode inductance unit 133 do not limit the differential-mode inductance unit 133 according to the embodiment of the utility model. For convenience of description, fig. 3 and fig. 4 each illustrate the differential mode inductance unit 133 as the inductance L1.

The first capacitor unit 131 is connected in parallel with the second capacitor unit 132, and the differential-mode inductance unit 133 is connected between the first capacitor unit 131 and the second capacitor unit 132, thereby forming a topology similar to pi.

The connection terminal of the first capacitor unit 131 (corresponding to the two ends of the capacitor C1 in fig. 3 and 4) forms the input terminal of the pi-type filter circuit 13, and the connection terminal of the second capacitor unit 132 (corresponding to the two ends of the capacitor C2 in fig. 3 and 4) forms the output terminal of the pi-type filter circuit 13. That is, the first capacitor unit 131 is connected in parallel to the rectifying circuit 12, and the second capacitor unit 132 is connected in parallel to the dc conversion circuit 14.

Based on such a design, in the pi-type filter circuit 13, the first capacitance unit 131 may constitute a C-type filter, and the differential mode inductance unit 133 and the second capacitance unit 132 may together constitute a low-pass LC filter.

Specifically, as shown in fig. 3, when the DC-DC converter 14 is a single-stage DC-DC converter, the first DC power output from the rectifying circuit 12 may be first subjected to low-frequency filtering by the first capacitor unit 131, and then subjected to high-frequency differential-mode filtering by the differential-mode inductor unit 133 and the second capacitor unit 132. Therefore, the filtered first direct current can be purer and smoother.

In the power supply module 10 shown in fig. 4, the DC conversion circuit 14 includes a PFC circuit 141 and a DC-DC converter 142, and a third capacitance unit 143 is further connected between the DC-DC converter 142 and the PFC circuit 141. It is understood that the structure of the third capacitor unit 143 is the same as or similar to that of the first capacitor unit 131, and will not be described herein. For convenience of description, the third capacitor unit 143 is taken as the capacitor C3 in fig. 4 as an example. The capacitance of the first capacitor 131 and the capacitance of the second capacitor 132 are smaller than the capacitance of the third capacitor 143.

In this way, the first direct current output by the rectifying circuit 12 may be filtered by the first capacitor unit 131, and then high-frequency differential mode filtered by the differential mode inductor unit 133 and the second capacitor unit 132. The filtered first direct current passes through the PFC circuit 141 and is then subjected to low-frequency filtering by the third capacitor unit 143.

Therefore, after the pi-type filter circuit 13 and the third capacitor unit 143 are used for filtering, the first direct current can be purer and smoother, so that the DC-DC converter 142 can output stable second direct current.

In the embodiment of the present utility model, although the EMC protection circuit 11 can suppress the surge voltage of the ac power grid 200, the surge residual voltage still enters the post-stage circuit of the EMC protection circuit 11, so as to charge the first capacitor unit 131 and the differential mode inductance unit 133 of the pi-type filter circuit 13. The energy stored by the differential-mode inductance unit 133 is released to the second capacitance unit 132, so that the second capacitance unit 132 is charged, and the voltage of the second capacitance unit 132 (i.e. the voltage of the output end) becomes high instantaneously, which may cause the voltage born by the switching device in the dc conversion circuit 14 to be too high, resulting in overstress failure of the switching device. Thus, to avoid overstressing the switching device, with continued reference to fig. 2, the power module 10 further includes a semiconductor discharge tube 15 (Thyristor Surge Suppressors, TSS, also referred to as a fixed discharge tube, surge suppressing thyristor).

Specifically, the semiconductor discharge tube 15 is connected to the input terminal and the output terminal of the pi filter circuit 13. That is, in fig. 3 and 4, the semiconductor discharge tube 15 (corresponding to Q in fig. 3 and 4) is connected in parallel with the differential mode inductance unit 133.

Thus, the voltage connected to the semiconductor discharge tube 15 is the difference between the input voltage of the pi-type filter circuit 13 (i.e. the voltage of the first capacitor unit 131, for convenience of description, may be simply referred to as U1) and the output voltage of the pi-type filter circuit 13 (i.e. the voltage of the second capacitor unit 132, for convenience of description, may be simply referred to as U2), that is, the voltage across the differential-mode inductance unit 133.

When U1-U2 is larger than or equal to the preset threshold value, the semiconductor discharge tube 15 is conducted. Conversely, when U1-U2< a preset threshold, the semiconductor discharge tube 15 is turned off.

Based on such a design, when the surge residual voltage enters the pi-type filter circuit 13, since the surge voltage is an instantaneous overvoltage, U1 rises rapidly, and thus U2 is greatly exceeded. Furthermore, when U1-U2 is equal to or greater than the preset threshold value, the semiconductor discharge tube 15 is turned on rapidly, and the voltage clamp at the two ends of the turned-on semiconductor discharge tube 15 is 0, so that the first capacitor unit 131 and the second capacitor unit 132 can be connected into a path through the turned-on semiconductor discharge tube 15, and the differential-mode inductance unit 133 is shorted by the turned-on semiconductor discharge tube 15.

In this way, the turned-on semiconductor discharge tube 15 can prevent the surge residual voltage from charging the differential mode inductance unit 133. Furthermore, the differential-mode inductance unit 133 cannot charge the second capacitance unit 132, and U2 cannot be raised, so that the problem of overstress failure of devices of the subsequent-stage circuit caused by over-high U2 is solved at the source, and breakdown and damage of the second capacitance unit 132 can be prevented. The energy stored by the first capacitor 131 can be released to the second capacitor 132 through the turned-on semiconductor discharge tube 15, so that U1 and U2 are clamped to be equal, and U2 cannot be suddenly changed.

Referring to fig. 5, an embodiment of the utility model further provides an electronic device 100.

In the embodiment of the present utility model, the electronic device 100 may be a power supply device such as a power adapter, a charger, or the like. The power module provided in the above embodiment may be applied to the electronic device 100.

The terminal device 300 may be an electronic product or an intelligent product. For example, the terminal device 300 may be a cell phone, tablet, desktop, laptop, handheld computer, notebook, ultra-mobile personal computer (UMPC), netbook, or other consumer electronic terminal device.

Based on such design, as shown in fig. 5, the electronic device 100 may connect the ac power grid 200 and the terminal device 300, and the electronic device 100 may convert ac power of the ac power grid 200 into dc power meeting the specification requirements of the terminal device 300, so as to stably and reliably supply power to the terminal device 300.

In summary, the power module 10 and the electronic device 100 according to the embodiments of the present utility model can solve the problem of too high output voltage of the pi-type filter circuit 13 caused by charging the differential-mode inductance unit 133 of the pi-type filter circuit 13 with the surge voltage from the source by arranging the semiconductor discharge tube 15 connected in parallel with the pi-type filter circuit 13, and effectively reduce the stress of the second capacitor unit 132 in the pi-type filter circuit 13 and the stress of the switching tube in the post-stage dc conversion circuit 14 in the surge scene.

Since the semiconductor discharge tube 15 is a switching device that is turned on or off by means of PN, the preset threshold value can be determined by the specification parameters of the semiconductor discharge tube 15 in the embodiment of the present utility model, so that it can be very accurate.

In addition, the semiconductor discharge tube 15 has a very fast response speed, so that the power module 10 and the electronic device 100 of the embodiment of the utility model can respond to transient surge voltage quickly, inhibit the voltage of the output end of the pi-type filter circuit 13 in time, prevent the surge voltage of the output end of the pi-type filter circuit 13 from being too high, play a role in protecting the pi-type filter circuit 13 and the direct current conversion circuit 14, and ensure the normal operation of the power module 10.

In addition, the power module 10 and the electronic device 100 of the embodiment of the utility model can obtain good surge residual voltage suppression effect by only adding one semiconductor discharge tube 15, and do not affect the performance of other circuits/devices in the power module 10. Therefore, the power module 10 and the electronic device 100 of the embodiment of the utility model have the advantages of low cost, small occupied area, simple landing and wide application range.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims (10)

1. A power module is characterized by comprising an EMC protection circuit, a rectifying circuit, a pi-type filter circuit, a direct current conversion circuit and a semiconductor discharge tube, wherein,

the EMC protection circuit is used for being connected with an alternating current power grid so as to be connected with alternating current;

the rectifying circuit is connected with the EMC protection circuit and is used for converting the alternating current into first direct current;

the input end of the pi-type filter circuit is connected with the rectifying circuit, the output end of the pi-type filter circuit is connected with the direct current conversion circuit, and the pi-type filter circuit is used for filtering the first direct current;

the direct current conversion circuit is used for converting the filtered first direct current into a second direct current;

the semiconductor discharge tube is connected with the input end and the output end of the pi-type filter circuit, and is used for being conducted when the voltage of the input end of the pi-type filter circuit is larger than the voltage of the output end of the pi-type filter circuit and the voltage difference between the voltage of the input end and the voltage of the output end is not smaller than a preset threshold value, so that the input end and the output end of the pi-type filter circuit are communicated through the conducted semiconductor discharge tube.

2. The power module of claim 1, wherein the pi-type filter circuit comprises a first capacitor unit, a second capacitor unit, and a differential mode inductor unit, wherein a connection end of the first capacitor unit forms an input end of the pi-type filter circuit, a connection end of the second capacitor unit forms an output end of the pi-type filter circuit, the first capacitor unit is connected in parallel with the second capacitor unit, and the differential mode inductor unit is connected between the first capacitor unit and the second capacitor unit.

3. The power module of claim 2, wherein the voltage of the first capacitor unit is equal to the voltage of the second capacitor unit after the semiconductor discharge tube is turned on.

4. The power module of claim 1 wherein the semiconductor discharge tube is configured to open when a voltage difference between the input terminal voltage and the output terminal voltage is less than the preset threshold.

5. The power module of claim 2 wherein the dc conversion circuit is of a single stage configuration.

6. The power module of claim 5, wherein a capacitance value of the first capacitive element is greater than a capacitance value of the second capacitive element.

7. The power module of claim 2, wherein the dc conversion circuit comprises a power factor correction circuit and a dc-dc converter, the power factor correction circuit is connected to the output of the pi filter circuit and the dc-dc converter, and a third capacitor unit is further connected between the power factor correction circuit and the dc-dc converter.

8. The power module of claim 7, wherein the capacitance of the first capacitive element and the capacitance of the second capacitive element are both less than the capacitance of the third capacitive element.

9. The electronic equipment is used for supplying power to terminal equipment and is characterized by comprising a power supply module, wherein the power supply module comprises a semiconductor discharge tube, an EMC protection circuit, a rectifying circuit, a pi-type filter circuit and a direct current conversion circuit which are sequentially connected, the semiconductor discharge tube is connected with an input end and an output end of the pi-type filter circuit, the semiconductor discharge tube is used for being communicated when the voltage of the input end of the pi-type filter circuit is larger than the voltage of the output end of the pi-type filter circuit, and the voltage difference between the voltage of the input end and the voltage of the output end is not smaller than a preset threshold value, so that the input end and the output end of the pi-type filter circuit are communicated through the conducted semiconductor discharge tube.

10. The electronic device of claim 9, wherein the electronic device comprises a charger or a power adapter.