CN221177543U - Power supply circuit and electronic device - Google Patents
Power supply circuit and electronic device Download PDFInfo
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- CN221177543U CN221177543U CN202323012808.5U CN202323012808U CN221177543U CN 221177543 U CN221177543 U CN 221177543U CN 202323012808 U CN202323012808 U CN 202323012808U CN 221177543 U CN221177543 U CN 221177543U
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Abstract
The utility model discloses a power supply circuit and an electronic device, wherein the electronic device comprises an amplifying circuit and needs to be in short circuit with a ground wire, and the power supply circuit comprises: the power supply circuit includes: the power supply circuit comprises a voltage stabilizing module, an amplifying module, a capacitor C2, a first input end, a second input end, a power supply output positive end, a power supply output negative end and a grounding end, wherein the voltage stabilizing module is used for stabilizing the voltage input by the first input end of the power supply circuit and the second input end of the power supply circuit and then outputting a stable voltage to the amplifying circuit, the amplifying circuit is used for amplifying the output current of the voltage stabilizing module to the power supply output positive end of the power supply circuit and the power supply output negative end of the power supply circuit, and the capacitor C2 is connected between the power supply output negative end of the power supply circuit and the grounding end of the power supply circuit. The utility model can effectively supply power, reduce the risk of saturation of the operational amplifier and improve the lightning surge and group pulse immunity performance of the active filter.
Description
Technical Field
The present utility model relates to the field of power supply technologies, and in particular, to a power supply circuit and an electronic device.
Background
The active filter needs to amplify the sampled common-mode noise signal and then inject the amplified common-mode noise signal into the ground wire, so that the power supply negative end of the active filter needs to be short-circuited with the ground wire for an alternating current path, the power supply negative end of the conventional active filter is directly connected with the ground wire, for example, chinese patent publication No. CN115149517A, entitled "differential common-mode integrated active filter and electric system", and U.S. patent publication No. US17/223835, entitled "Active Electromagnetic Interference (EMI) filter for common-Mode EMI reduction" disclose an active filter suitable for filtering common-mode noise, and schematic diagrams are shown in fig. 1 and 2, wherein compensating current is injected into the ground wire by shorting the power supply negative end of the active filter with the ground wire, so that the common-mode noise is reduced, and the common-mode noise signal is well inhibited, but the inventor of the present application finds that the connection mode has the following defects in research:
(1) The stability of the filter is poor, when the power supply end is lower than or higher than the ground voltage, abnormal power supply of the filter is caused, and the filter cannot work normally;
(2) In the case where the common mode noise is large, saturation of the active filter amplifying circuit is easily caused.
(3) The lightning surge and group pulse immunity performance of the active filter is poor.
The above-described problems are also present in other electronic devices that include an amplifying circuit and that require shorting to ground.
It should be noted that the above information disclosed in the background section is only for enhancement of understanding of the general background of the application and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of utility model
Accordingly, the present utility model solves the technical problem of providing a power supply circuit and an electronic device using the same, which can solve the above-mentioned drawbacks of the prior art at least to a certain extent.
As a first aspect of the present utility model, an embodiment of a power supply circuit is provided as follows:
A power supply circuit for supplying power to an electronic device, the electronic device comprising an amplifying circuit and requiring shorting to ground, wherein: the power supply circuit includes: the power supply circuit comprises a voltage stabilizing module, an amplifying module, a capacitor C2, a first input end, a second input end, a power supply output positive end, a power supply output negative end and a grounding end, wherein the voltage stabilizing module is used for stabilizing the voltage input by the first input end of the power supply circuit and the second input end of the power supply circuit and then outputting a stable voltage to the amplifying circuit, the amplifying circuit is used for amplifying the output current of the voltage stabilizing module to the power supply output positive end of the power supply circuit and the power supply output negative end of the power supply circuit, and the capacitor C2 is connected between the power supply output negative end of the power supply circuit and the grounding end of the power supply circuit.
Preferably, the voltage stabilizing module includes a resistor R1, a resistor R2, and a zener diode D1, one end of the resistor R1 is connected to the first input end, the other end of the resistor R1 is connected to the cathode of the zener diode D1, the anode of the zener diode D1 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to the second input end, and the cathode of the zener diode D1 and the anode of the zener diode D1 output the stabilized voltage.
Preferably, the amplifying module includes a triode Q1, a triode Q2 and a capacitor C1, where a collector of the triode Q1 is connected to the first input end, an emitter of the triode Q1 is connected to one end of the capacitor C1, another end of the capacitor C1 is connected to an emitter of the triode Q2, a collector of the triode Q2 is connected to the second input end, a base of the triode Q1 and a base of the triode Q2 input the stable voltage, and a base potential of the triode Q1 is higher than a base potential of the triode Q2.
Further, the collector of the triode Q1 is connected with the first input end of the power supply circuit through a resistor; and/or the collector of the triode Q2 is connected with the second input end of the power supply circuit through another resistor.
As a second aspect of the present utility model, an embodiment of the electronic device is provided as follows:
An electronic device, including an amplifying circuit in the electronic device, and needing to be shorted to a ground line, characterized in that: the electronic device is powered by the power supply circuit of any one of the first aspects.
Further, the electronic device is an active filter, the active filter includes an active filter module, a power supply output positive end of the power supply circuit is connected with a power supply input positive end of the active filter module, a power supply output negative end of the power supply circuit is connected with a power supply input negative end of the active filter module, a grounding end of the power supply circuit is used for grounding, and a connection relation between the active filter module and other ports of the power supply circuit is one of the following four conditions:
Case one: the first input end of the active filtering module and the first input end of the power supply circuit are connected together to be used for connecting one end of the power supply end, the second input end of the active filtering module and the second input end of the power supply circuit are connected together to be used for connecting the other end of the power supply end, the first output end of the active filtering module is used for connecting one end of the power utilization end, and the second output end of the active filtering module is used for connecting the other end of the power utilization end;
And a second case: the first input end of the active filtering module is used for being connected with one end of the power supply end, the second input end of the active filtering module is used for being connected with the other end of the power supply end, the first output end of the active filtering module and the first input end of the power supply circuit are connected together and used for being connected with one end of the power utilization end, and the second output end of the active filtering module and the second input end of the power supply circuit are connected together and used for being connected with the other end of the power utilization end;
And a third case: the first input end of the active filtering module is connected with the first input end of the power supply circuit and is used for being connected with one end of the power supply end, the second input end of the active filtering module is used for being connected with the other end of the power supply end, the first output end of the active filtering module is used for being connected with one end of the power utilization end, and the second output end of the active filtering module is connected with the second input end of the power supply circuit and is used for being connected with the other end of the power utilization end;
case four: the first input end of the active filter module is used for being connected with one end of the power supply end, the second input end of the active filter module and the second input end of the power supply circuit are connected together to be used for being connected with the other end of the power supply end, the first output end of the active filter module and the first input end of the power supply circuit are connected together to be used for being connected with one end of the power utilization end, and the second output end of the active filter module is used for being connected with the other end of the power utilization end.
Further, the active filtering module comprises a first active filtering module and a second active filtering module, wherein a power supply input positive end of the first active filtering module and a power supply input positive end of the second active filtering module are connected together to serve as a power supply input positive end of the active filtering module, a power supply input negative end of the first active filtering module and a power supply input negative end of the second active filtering module are connected together to serve as a power supply input negative end of the active filtering module, an input end of the first active filtering module is a first input end of the active filtering module, an output end of the first active filtering module is a first output end of the active filtering module, an input end of the second active filtering module is a second input end of the active filtering module, and an output end of the second active filtering module is a second output end of the active filtering module.
The working principle of the utility model is analyzed in detail by combining with the embodiment, and the embodiment of the utility model has the following beneficial effects compared with the prior art:
1. When the power supply circuit is applied to an electronic device which comprises an amplifying circuit and needs to be in short circuit with a ground wire, under the condition that the voltage of the input end of the amplifying circuit is large, the voltage of the input end of the amplifying circuit in the electronic device can be reduced by increasing the capacitance value of the capacitor C2, so that the amplifying circuit is prevented from being saturated, and compared with the traditional power supply circuit, the electronic device applying the embodiment of the utility model is more stable;
2. The capacitor C2 in the power supply circuit can separate the power supply input negative terminal of the electronic device from the ground, so that the ground impedance is increased, the lightning stroke surge and the group pulse current of the resistance device are reduced, the lightning stroke surge and the group pulse voltage at two ends of the electronic device are reduced, and compared with the traditional power supply circuit, the power supply circuit comprises an amplifying circuit, and the electronic device needing to be in short circuit with the ground wire has better lightning stroke surge and group pulse immunity performance;
3. The utility model can solve the problem that when the traditional electronic device which comprises the amplifying circuit and needs to be in short circuit with the ground wire supplies power, the amplifying module cannot work in an amplifying state due to the fact that the ground wire voltage is lower than or higher than the voltage of the power supply end, so that the power supply circuit works abnormally.
Drawings
FIG. 1CN115149517A is a schematic diagram of a first active filter;
Fig. 2US17/223835 second active filter schematic;
fig. 3 is a schematic diagram of a power supply circuit according to a first embodiment of the present utility model applied to an electronic device.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present utility model can be understood in detail, a more particular description of the utility model, briefly summarized below, may be had by reference to embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
It should be noted that the terms "comprising" and "having" and any variations thereof, as described in the specification and claims of the present application, are intended to cover a non-exclusive inclusion, for example, that a series of elements, unit circuits, or control timings are not necessarily limited to those elements, unit circuits, or control timings explicitly listed, but may include elements, unit circuits, or control timings not explicitly listed or inherent to such circuits.
In addition, the embodiments of the present application and the features in the embodiments may be combined with each other without collision.
It will be understood that, in the description and in the claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element or "connected" to the other element through a third element; when it is described that a step is continued to another step, the step may be continued directly to the another step or through a third step to the another step.
First embodiment
The embodiment provides a power supply circuit for electronic device power supply, including amplifier circuit in the electronic device, and need with ground wire short circuit, wherein: the power supply circuit includes: the power supply circuit comprises a voltage stabilizing module, an amplifying module, a capacitor C2, a first input end, a second input end, a power supply output positive end, a power supply output negative end and a grounding end, wherein the voltage stabilizing module is used for stabilizing the voltage input by the first input end of the power supply circuit and the second input end of the power supply circuit and then outputting a stabilized voltage to the amplifying module, the amplifying module is used for amplifying the output current of the voltage stabilizing module to the power supply output positive end of the power supply circuit and the power supply output negative end of the power supply circuit, and the capacitor C2 is connected between the power supply output negative end of the power supply circuit and the grounding end of the power supply circuit.
Compared with the prior art, the beneficial effects of the embodiment are as follows:
(1) When the power supply circuit is applied to an electronic device which comprises an amplifying circuit and needs to be in short circuit with a ground wire, under the condition that the voltage of the input end of the amplifying circuit is large, the voltage of the input end of the amplifying circuit in the electronic device can be reduced by increasing the capacitance value of the capacitor C2, so that the amplifying circuit is prevented from being saturated, and compared with the traditional power supply circuit, the electronic device applying the embodiment of the utility model is more stable;
(2) The capacitor C2 in the power supply circuit of the embodiment can separate the power supply input negative terminal of the electronic device from the ground, so that the ground impedance is increased, the lightning stroke surge and the group pulse current of the resistance device are reduced, the lightning stroke surge and the group pulse voltage at two ends of the electronic device are reduced, and compared with the traditional power supply circuit, the embodiment comprises an amplifying circuit, and the electronic device needing to be in short circuit with the ground wire has better lightning stroke surge and group pulse immunity performance;
(3) The utility model can solve the problem that when the traditional electronic device which comprises the amplifying circuit and needs to be in short circuit with the ground wire supplies power, the amplifying module cannot work in an amplifying state due to the fact that the ground wire voltage is lower than or higher than the voltage of the power supply end, so that the power supply circuit works abnormally.
Fig. 3 is a schematic diagram of a power supply circuit 101 applied to an electronic device according to a first embodiment of the present utility model, please refer to fig. 3:
The voltage stabilizing module 102 includes a resistor R1, a resistor R2, and a voltage stabilizing diode D1, one end of the resistor R1 is connected to the first input end, the other end of the resistor R1 is connected to the cathode of the voltage stabilizing diode D1, the anode of the voltage stabilizing diode D1 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to the second input end, and the cathode of the voltage stabilizing diode D1 and the anode of the voltage stabilizing diode D1 output a stable voltage.
The amplifying module 103 includes a triode Q1, a triode Q2 and a capacitor C1, where a collector of the triode Q1 is connected to the first input end, an emitter of the triode Q1 is connected to one end of the capacitor C1, another end of the capacitor C1 is connected to an emitter of the triode Q2, a collector of the triode Q2 is connected to the second input end, a base of the triode Q1 and a base of the triode Q2 input a stable voltage, and a base potential of the triode Q1 is higher than a base potential of the triode Q2. When the voltage of the power supply terminal of the amplifying module is lower than or higher than the ground, the triode Q2 or the triode Q1 cannot work in an amplifying state.
The power supply circuit in fig. 3 works as follows:
The resistor R1, the resistor R2 and the zener diode D1 form a zener module, the voltage at two ends of the zener diode D1 is the stable voltage of the zener module, and the sampling triode Q1, the triode Q2 and the capacitor C1 form an amplifying module for amplifying the output current of the zener module in order to increase the current driving capability of the zener module.
Further, the collector of the triode Q1 is connected with the first input end of the power supply circuit through a resistor; and/or the collector of the triode Q2 is connected with the second input end of the power supply circuit through another resistor, and the voltage between the emitter and the collector of the triode can be reduced by adding the resistor to the collector of the triode, so that the power consumption of the triode is reduced.
Second embodiment
The embodiment provides an electronic device, which includes an amplifying circuit and needs to be shorted with a ground wire, wherein: the electronic device is powered by the power supply circuit of any of the above first embodiments.
Preferably, the electronic device is an active filter, the active filter includes an active filter module, a power supply output positive end of the power supply circuit is connected with a power supply input positive end of the active filter module, a power supply output negative end of the power supply circuit is connected with a power supply input negative end of the active filter module, a grounding end of the power supply circuit is used for grounding, and a connection relation between the active filter module and other ports of the power supply circuit is one of the following four conditions:
Case one: the first input end of the active filter module is connected with the first input end of the power supply circuit and is used for being connected with one end of the power supply end, the second input end of the active filter module is connected with the second input end of the power supply circuit and is used for being connected with the other end of the power supply end, the first output end of the active filter module is used for being connected with one end of the power utilization end, and the second output end of the active filter module is used for being connected with the other end of the power utilization end;
And a second case: the first input end of the active filter module is used for being connected with one end of the power supply end, the second input end of the active filter module is used for being connected with the other end of the power supply end, the first output end of the active filter module and the first input end of the power supply circuit are connected together and are used for being connected with one end of the power utilization end, and the second output end of the active filter module and the second input end of the power supply circuit are connected together and are used for being connected with the other end of the power utilization end;
And a third case: the first input end of the active filter module is connected with the first input end of the power supply circuit and is used for being connected with one end of the power supply end, the second input end of the active filter module is used for being connected with the other end of the power supply end, the first output end of the active filter module is used for being connected with one end of the power utilization end, and the second output end of the active filter module is connected with the second input end of the power supply circuit and is used for being connected with the other end of the power utilization end;
Case four: the first input end of the active filter module is used for being connected with one end of the power supply end, the second input end of the active filter module is connected with the second input end of the power supply circuit and is used for being connected with the other end of the power supply end, the first output end of the active filter module is connected with the first input end of the power supply circuit and is used for being connected with one end of the power utilization end, and the second output end of the active filter module is used for being connected with the other end of the power utilization end.
The active filter shown in fig. 3 adopts the connection method that is the first case.
Further, the active filtering module comprises a first active filtering module and a second active filtering module, wherein the power supply input positive end of the first active filtering module and the power supply input positive end of the second active filtering module are connected together to serve as the power supply input positive end of the active filtering module, the power supply input negative end of the first active filtering module and the power supply input negative end of the second active filtering module are connected together to serve as the power supply input negative end of the active filtering module, the input end of the first active filtering module is the first input end of the active filtering module, the output end of the first active filtering module is the first output end of the active filtering module, the input end of the second active filtering module is the second input end of the active filtering module, and the output end of the second active filtering module is the second output end of the active filtering module.
The active filtering module in fig. 1 comprises a first active filtering module and a second active filtering module, in particular: the circuit 11 in fig. 1 is a first active filter module, and the operational amplifier is an amplifying circuit; the circuit formed by 12 is a second active filter module, and the operational amplifier is an amplifying circuit. The active filter module in fig. 2 is a single module, and the operational amplifier 350, the resistor R11, the resistor R12, the resistor R13, the resistor R14, the capacitor C9 and the capacitor C10 form an amplifying circuit.
The above embodiments are only for aiding in understanding the concept of the present utility model and are not intended to limit the utility model, and any modifications, equivalent substitutions, improvements, etc. made by those skilled in the art without departing from the principles of the present utility model should be included in the scope of the present utility model.
Claims (7)
1. The utility model provides a power supply circuit for electronic device power supply, including amplifier circuit in the electronic device, and need with ground wire short circuit, its characterized in that: the power supply circuit includes: the power supply circuit comprises a voltage stabilizing module, an amplifying module, a capacitor C2, a first input end, a second input end, a power supply output positive end, a power supply output negative end and a grounding end, wherein the voltage stabilizing module is used for stabilizing the voltage input by the first input end of the power supply circuit and the second input end of the power supply circuit and then outputting a stable voltage to the amplifying circuit, the amplifying circuit is used for amplifying the output current of the voltage stabilizing module to the power supply output positive end of the power supply circuit and the power supply output negative end of the power supply circuit, and the capacitor C2 is connected between the power supply output negative end of the power supply circuit and the grounding end of the power supply circuit.
2. The power supply circuit of claim 1, wherein: the voltage stabilizing module comprises a resistor R1, a resistor R2 and a voltage stabilizing diode D1, wherein one end of the resistor R1 is connected with the first input end, the other end of the resistor R1 is connected with the cathode of the voltage stabilizing diode D1, the anode of the voltage stabilizing diode D1 is connected with one end of the resistor R2, the other end of the resistor R2 is connected with the second input end, and the cathode of the voltage stabilizing diode D1 and the anode of the voltage stabilizing diode D1 output the stable voltage.
3. A power supply circuit according to claim 1 or 2, characterized in that: the amplifying module comprises a triode Q1, a triode Q2 and a capacitor C1, wherein a collector electrode of the triode Q1 is connected with the first input end, an emitter electrode of the triode Q1 is connected with one end of the capacitor C1, the other end of the capacitor C1 is connected with the emitter electrode of the triode Q2, a collector electrode of the triode Q2 is connected with the second input end, a base electrode of the triode Q1 and a base electrode of the triode Q2 are input with the stable voltage, and a base electrode potential of the triode Q1 is higher than a base electrode potential of the triode Q2.
4. A power supply circuit according to claim 3, characterized in that: the collector electrode of the triode Q1 is connected with the first input end of the power supply circuit through a resistor; and/or the collector of the triode Q2 is connected with the second input end of the power supply circuit through another resistor.
5. An electronic device, including an amplifying circuit in the electronic device, and needing to be shorted to a ground line, characterized in that: the electronic device being powered by the power supply circuit of any one of claims 1 to 4.
6. The electronic device of claim 5, wherein: the electronic device is an active filter, the active filter comprises an active filter module, a power supply output positive end of a power supply circuit is connected with a power supply input positive end of the active filter module, a power supply output negative end of the power supply circuit is connected with a power supply input negative end of the active filter module, a grounding end of the power supply circuit is used for grounding, and the connection relation between the active filter module and other ports of the power supply circuit is one of the following four conditions:
Case one: the first input end of the active filtering module and the first input end of the power supply circuit are connected together to be used for being connected with one end of the power supply end, the second input end of the active filtering module and the second input end of the power supply circuit are connected together to be used for being connected with the other end of the power supply end, the first output end of the active filtering module is used for being connected with one end of the power utilization end, and the second output end of the active filtering module is used for being connected with the other end of the power utilization end;
And a second case: the first input end of the active filtering module is used for being connected with one end of the power supply end, the second input end of the active filtering module is used for being connected with the other end of the power supply end, the first output end of the active filtering module and the first input end of the power supply circuit are connected together and used for being connected with one end of the power utilization end, and the second output end of the active filtering module and the second input end of the power supply circuit are connected together and used for being connected with the other end of the power utilization end;
And a third case: the first input end of the active filtering module is connected with the first input end of the power supply circuit and is used for being connected with one end of the power supply end, the second input end of the active filtering module is used for being connected with the other end of the power supply end, the first output end of the active filtering module is used for being connected with one end of the power utilization end, and the second output end of the active filtering module is connected with the second input end of the power supply circuit and is used for being connected with the other end of the power utilization end;
case four: the first input end of the active filter module is used for being connected with one end of the power supply end, the second input end of the active filter module and the second input end of the power supply circuit are connected together to be used for being connected with the other end of the power supply end, the first output end of the active filter module and the first input end of the power supply circuit are connected together to be used for being connected with one end of the power utilization end, and the second output end of the active filter module is used for being connected with the other end of the power utilization end.
7. The electronic device of claim 6, wherein: the active filtering module comprises a first active filtering module and a second active filtering module, wherein a power supply input positive end of the first active filtering module and a power supply input positive end of the second active filtering module are connected together to serve as a power supply input positive end of the active filtering module, a power supply input negative end of the first active filtering module and a power supply input negative end of the second active filtering module are connected together to serve as a power supply input negative end of the active filtering module, an input end of the first active filtering module is a first input end of the active filtering module, an output end of the first active filtering module is a first output end of the active filtering module, an input end of the second active filtering module is a second input end of the active filtering module, and an output end of the second active filtering module is a second output end of the active filtering module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323012808.5U CN221177543U (en) | 2023-11-08 | 2023-11-08 | Power supply circuit and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323012808.5U CN221177543U (en) | 2023-11-08 | 2023-11-08 | Power supply circuit and electronic device |
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| Publication Number | Publication Date |
|---|---|
| CN221177543U true CN221177543U (en) | 2024-06-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202323012808.5U Active CN221177543U (en) | 2023-11-08 | 2023-11-08 | Power supply circuit and electronic device |
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| Country | Link |
|---|---|
| CN (1) | CN221177543U (en) |
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- 2023-11-08 CN CN202323012808.5U patent/CN221177543U/en active Active
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