CN220440421U - Power supply switching circuit and doorbell - Google Patents
Power supply switching circuit and doorbell Download PDFInfo
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- CN220440421U CN220440421U CN202321995952.2U CN202321995952U CN220440421U CN 220440421 U CN220440421 U CN 220440421U CN 202321995952 U CN202321995952 U CN 202321995952U CN 220440421 U CN220440421 U CN 220440421U
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Abstract
The utility model relates to a power supply switching circuit and a doorbell. The power supply switching circuit is applied to doorbell, includes: the first power supply module comprises a first power supply port and a first conduction part, wherein the first conduction part is connected between the first power supply port and the power utilization port and is used for conducting or disconnecting a power supply passage between the first power supply port and the power utilization port; the second power supply module comprises a second power supply port, and the second power supply port is connected with the first conducting part and the power utilization port; and the first switch control module is attached between the second power supply port and the first conduction part, and controls the first conduction part to conduct the power supply path between the first power supply port and the power utilization port when the power supply path between the second power supply port and the power utilization port is disconnected. The power supply switching circuit can automatically switch the power supply when the power supply is powered off.
Description
Technical Field
The utility model relates to the technical field of household equipment, in particular to a power supply switching circuit and a doorbell.
Background
Doorbell is a common household equipment, comprises power supply, doorbell power supply circuit and doorbell body generally, and power supply can realize the power supply to the doorbell through doorbell power supply circuit.
At present, the doorbell on the market is divided into 2 types, one type is a normal electric doorbell, a power supply of the normal electric doorbell is usually a power grid, the other type is a battery doorbell, and the power supply of the battery doorbell is a battery.
However, for the above-mentioned ordinary electric doorbell and battery doorbell, once power supply loses the electricity, then doorbell can stop work because can not obtain the power supply support, influences doorbell's use.
Disclosure of Invention
Based on this, it is necessary to provide a power supply switching circuit that can automatically switch the power supply when the power supply is powered down.
A power switching circuit for a doorbell, comprising:
the first power supply module comprises a first power supply port and a first conduction part, wherein the first conduction part is connected between the first power supply port and the power utilization port and is used for conducting or disconnecting a power supply passage between the first power supply port and the power utilization port;
the second power supply module comprises a second power supply port, and the second power supply port is connected with the first conducting part and the power utilization port;
and the first switch control module is attached between the second power supply port and the first conduction part, and controls the first conduction part to conduct the power supply path between the first power supply port and the power utilization port when the power supply path between the second power supply port and the power utilization port is disconnected.
In one embodiment, the first conducting portion includes a first MOS transistor;
the drain electrode of the first MOS tube is connected with the first power supply port, the source electrode of the first MOS tube is connected with the power utilization port, and the grid electrode of the first MOS tube is connected between the power utilization port and the second power supply port;
the first switch control module is attached between the second power supply port and the grid electrode of the first MOS tube, and when the power supply passage between the second power supply port and the power utilization port is disconnected, the first switch control module controls the grid electrode of the first MOS tube to be closed so as to conduct the power supply passage between the first power supply port and the power utilization port.
In one embodiment, the first switch control module includes a discharge resistor; one end of the discharging resistor is connected between the second power supply port and the grid electrode of the first MOS tube, the other end of the discharging resistor is grounded, and when a power supply passage between the second power supply port and the power utilization port is disconnected, the discharging resistor pulls down the grid electrode voltage of the first MOS tube and controls the grid electrode of the first MOS tube to be closed.
In one embodiment, the power supply switching circuit includes a first diode and a second diode; one end of the first diode is connected with the second power supply port, and the other end of the first diode is connected with the power utilization port; one end of the second diode is connected with the drain electrode of the first MOS tube, and the other end of the second diode is connected with the source electrode of the first MOS tube.
In one embodiment, the power supply switching circuit further includes a first resistor; one end of the first resistor is connected with the grid electrode of the first MOS tube, the other end of the first resistor is connected between the power utilization port and the second power supply port, and the first resistor is used for controlling the closing speed or the opening speed of the grid electrode of the first MOS tube.
In one embodiment, the power supply switching circuit further includes;
the second conduction part is connected between the second power supply port and the power utilization port and is used for conducting or cutting off a power supply path between the second power supply port and the power utilization port;
the second switch control module is connected with the second conduction part and used for controlling the second conduction part to conduct or cut off a power supply passage between the second power supply port and the power utilization port.
In one embodiment, the second conducting portion includes a second MOS transistor;
the source electrode of the second MOS tube is connected with the second power supply port, and the drain electrode of the second MOS tube is connected with the power utilization port;
the second switch control module is connected with the grid electrode of the second MOS tube and is used for controlling the second conduction part to conduct or cut off a power supply passage between the second power supply port and the power utilization port by controlling the grid electrode of the second MOS tube to be closed or opened.
In one embodiment, the second switch control module includes a second resistor, a triode, and a third resistor; one end of the second resistor is connected with a signal input port, the other end of the second resistor is connected with the base electrode of the triode, the signal input port is used for outputting a control signal to the triode, and the control signal is used for controlling the triode to be closed or opened; one end of the third resistor is connected with the base electrode of the triode, and the other end of the third resistor is connected with the emitter electrode of the triode; the emitter of the triode is grounded, the collector of the triode is connected with the grid electrode of the second MOS tube, and the triode is used for controlling the grid electrode of the second MOS tube to be closed by pulling down the grid voltage of the second MOS tube when the triode is closed.
In one embodiment, the power supply switching circuit further includes a fourth resistor, a first capacitor, and a second capacitor; one end of the fourth resistor is connected with the collector electrode of the triode, and the other end of the fourth resistor is connected with the grid electrode of the second MOS tube; one end of the first capacitor is connected with the source electrode of the second MOS tube, and the other end of the first capacitor is connected with the grid electrode of the second MOS tube; one end of the second capacitor is connected with the drain electrode of the second MOS tube, and the other end of the second capacitor is connected with the grid electrode of the second MOS tube.
In one embodiment, the power supply switching circuit further includes a fifth resistor; one end of the fifth resistor is connected with the collector electrode of the triode, and the other end of the fifth resistor is connected with the second power supply port.
The doorbell comprises a doorbell body, a doorbell power supply circuit and a power supply switching circuit, wherein the doorbell power supply circuit is connected with the power supply switching circuit through the power utilization port, and the power supply switching circuit is like the power supply switching circuit.
The first power supply module, the second power supply module and the first switch control module are arranged in the power supply switching circuit, the first power supply module comprises a first power supply port and a first conduction part, the first conduction part is connected between the first power supply port and the power supply port, the second power supply module comprises a second power supply port, the second power supply port is connected with the first conduction part and the power supply port, the first switch control module is connected between the second power supply port and the first conduction part, and therefore when a power supply passage between the second power supply port and the power supply port is disconnected, the first switch control module controls the first conduction part to conduct the power supply passage between the first power supply port and the power supply port, and the power supply port can be automatically switched into the first power supply port by the second power supply port, so that the power supply of the doorbell can be automatically switched when the power supply of the doorbell is powered down.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments or the conventional techniques of the present utility model, the drawings required for the descriptions of the embodiments or the conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.
FIG. 1 is a power switching circuit according to an embodiment;
fig. 2 is a power supply switching circuit when the first conducting portion is a first MOS transistor;
FIG. 3 is a schematic diagram of a power switching circuit when the first switch control module is a discharge resistor;
FIG. 4 is a power switching circuit with a first diode and a second diode;
FIG. 5 is a power switching circuit with a first resistor;
FIG. 6 is a power switching circuit with a second pass-through section and a second switch control module;
fig. 7 is a power supply switching circuit when the second conducting portion is a second MOS transistor;
FIG. 8 is a schematic diagram of a power switching circuit when the second switch control module is composed of a second resistor, a triode, and a third resistor;
FIG. 9 is a power switching circuit with a fourth resistor, a first capacitor, and a second capacitor;
fig. 10 is a power supply switching circuit provided with a fifth resistor.
Detailed Description
In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. Embodiments of the utility model are illustrated in the accompanying drawings. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.
It will be understood that the terms first, second, etc. as used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another element. For example, a first resistance may be referred to as a second resistance, and similarly, a second resistance may be referred to as a first resistance, without departing from the scope of the utility model. Both the first resistor and the second resistor are resistors, but they are not the same resistor.
It is to be understood that in the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", etc., if the connected circuits, modules, units, etc., have electrical or data transfer between them.
It is understood that "at least one" means one or more and "a plurality" means two or more. "at least part of an element" means part or all of the element.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof. Also, the term "and/or" as used in this specification includes any and all combinations of the associated listed items.
The embodiment provides a power supply switching circuit, which is applied to a doorbell.
As shown in fig. 1, the power supply switching circuit includes a first power supply module 100, a second power supply module 200, and a first switch control module 300; the first power supply module 100 includes a first power supply port P1 and a first conductive part 101, the first conductive part 101 is connected between the first power supply port P1 and the power consumption port P3, so that the first conductive part 101 can conduct or disconnect a power supply path between the first power supply port P1 and the power consumption port P3; the second power supply module 200 includes a second power supply port P2, where the second power supply port P2 connects the first conducting portion 101 and the power consumption port P3; the first switch control module 300 is attached between the second power supply port P2 and the first conducting portion 101, and when the power supply port between the second power supply port P2 and the power consumption port P3 is disconnected, the first switch control module 300 can control the first conducting portion 101 to conduct the power supply path between the first power supply port P1 and the power consumption port P3, so that the power supply port of the doorbell can be automatically switched from the second power supply port P2 to the first power supply port P1, that is, the automatic switching of the power supply source of the doorbell can be realized.
In one embodiment, as shown in fig. 2, the first conducting portion 101 includes a first MOS transistor Q1; the grid electrode G of the first MOS tube Q1 is connected between the power utilization port P3 and the second power supply port P2, the drain electrode D of the first MOS tube Q1 is connected with the first power supply port P1, and the source electrode S of the first MOS tube Q1 is connected with the power utilization port P3; the first switch control module 300 is attached between the second power supply port P2 and the gate G of the first MOS transistor Q1.
The first MOS transistor Q1 is configured to switch on or off a power supply path between the first power supply port P1 and the power consumption port P3, and when the second power supply port P2 supplies power normally, the gate G of the first MOS transistor Q1 is in an open state, and at this time, the power supply path between the first power supply port P1 and the power consumption port P3 is not switched on; when the power supply path between the second power supply port P2 and the power utilization port P3 is opened, the first switch control module 300 may control the gate G of the first MOS transistor Q1 to be closed so as to conduct the power supply path between the first power supply port P1 and the power utilization port P3, thereby automatically switching the power supply port of the doorbell from the second power supply port P2 to the first power supply port P1, that is, automatically switching the power supply source of the doorbell.
As an example, the first power supply module 100 may further include a first power supply source, and the first power supply port P1 is an output port of the first power supply source; the second power supply module 200 may further include a second power supply source, and the second power supply port P2 is an output port of the second power supply source.
As an example, the first power supply source may be a battery, and the first power supply port P1 may be an output port of the battery; the second power supply may be an ACDC conversion circuit, and the second power supply port P2 is an output port of the ACDC conversion circuit, where the ACDC conversion circuit is configured to convert ac power input by the power grid into dc power, and output the dc power from an input end of the ACDC conversion circuit.
In this embodiment, by setting the first MOS transistor Q1 and the first switch control module 300, when the power supply path between the second power supply port P2 and the power consumption port P3 is disconnected, the first switch control module 300 controls the first MOS transistor Q1 to be closed, so as to conduct the power supply path between the first power supply port P1 and the power consumption port P3, so that the power supply port of the doorbell is automatically switched from the second power supply port P2 to the first power supply port P1, and the doorbell power supply is automatically switched when the doorbell power supply fails.
As shown in fig. 3, the first switch control module 300 includes a discharge resistor R0, one end of the discharge resistor R0 is connected between the second power supply port P2 and the gate G of the first MOS transistor Q1, and the other end of the discharge resistor R0 is grounded.
The first MOS transistor Q1 may be a low-voltage MOS transistor, when the gate voltage of the first MOS transistor Q1 is in a low-voltage state, the gate G of the first MOS transistor Q1 will be closed, and when the gate voltage of the first MOS transistor Q1 is in a high-voltage state, the gate G of the first MOS transistor Q1 will be opened.
As an example, if the gate voltage of the first MOS transistor Q1 is smaller than the preset voltage threshold, the gate G of the first MOS transistor Q1 is considered to be in a low voltage state, and if the gate voltage of the first MOS transistor Q1 is not smaller than the preset voltage threshold, the gate G of the first MOS transistor Q1 is considered to be in a high voltage state, wherein the preset voltage threshold is smaller than the supply voltage of the second supply port P2.
Thus, when the power supply path between the second power supply port P2 and the power utilization port P3 is turned on, the second power supply port P2 normally supplies power to the power utilization port P3, the gate G of the first MOS transistor Q1 is in a high voltage state, and the gate G of the first MOS transistor Q1 is turned off; when the power supply path between the second power supply port P2 and the power utilization port P3 is disconnected, the second power supply port P2 cannot supply power to the power utilization port P3 at this time, one end of the discharging resistor R0 is connected with the grid electrode G of the first MOS tube Q1, the other end of the discharging resistor R0 is grounded, electric charge on the grid electrode G of the first MOS tube Q1 can be led into the ground through the discharging resistor R0, and thus the grid voltage of the first MOS tube Q1 can be lowered by the discharging resistor R0, the grid electrode G of the first MOS tube Q1 is converted into a low-voltage state from a high-voltage state, the grid electrode G of the first MOS tube is closed at this time, the first MOS tube Q1 is conducted, and the first power supply port P1 supplies power to the power utilization port P3 through the first MOS tube Q1, so that the power supply port of a doorbell can be automatically switched into the first power supply port P1 from the second power supply port P2, and automatic switching of a doorbell power supply source can be realized.
As an example, the discharge resistor R0 may be formed by a plurality of resistors connected in parallel or may be formed by a plurality of resistors connected in series.
It is to be understood that the first switch control module 300 may take other forms, and is not limited to the forms already mentioned in the above embodiments, as long as it can achieve the function of controlling the first MOS transistor Q1 to be turned on or turned off.
As shown in fig. 4, the power supply switching circuit further includes a first diode D1 and a second diode D2, wherein one end of the first diode D1 is connected to the second power supply port P2, the gate G of the first MOS transistor and one end of the discharge resistor R0, the other end of the first diode D1 is connected to the power consumption port P3, one end of the second diode D2 is connected to the drain D of the first MOS transistor Q1, and the other end of the second diode D2 is connected to the source S of the first MOS transistor Q1 and the power consumption port P3; the first diode D1 and the second diode D2 each have a function of protecting a bypass current.
When the power supply path between the second power supply port P2 and the power utilization port P3 is disconnected, charges on the grid electrode G of the first MOS tube Q1 are led into the ground through the discharge resistor R0, the grid voltage of the first MOS tube Q1 is pulled down, the grid electrode G of the first MOS tube Q1 can be promoted to be closed, the first MOS tube Q1 is conducted, but a certain time is required in the conducting process of the first MOS tube Q1, and before the first MOS tube Q1 is not conducted, the first power supply port P1 supplies power to the power utilization port P3 through the second diode D2; after the first MOS transistor Q1 is turned on, the first power supply port P1 supplies power to the power consumption port P3 through the first MOS transistor Q1 due to the voltage drop of the second diode D2. After the power supply path between the second power supply port P2 and the power utilization port P3 is disconnected, the first power supply port P1 supplies power to the power utilization port P3 through the second diode D2 before the first MOS transistor Q1 is conducted, so that the power utilization port P3 can be ensured not to be suddenly powered off, and a power supply blank window does not exist; after the first MOS tube Q1 is conducted, the first power supply port P1 supplies power to the power utilization port P3 through the first MOS tube Q1, so that power supply efficiency loss caused by voltage drop of the second diode D2 is avoided, and power supply efficiency of the first power supply port P1 can be guaranteed.
As shown in fig. 5, the power supply switching circuit further includes a first resistor R1, one end of the first resistor R1 is connected to the gate G of the first MOS transistor, the other end of the first resistor R1 is connected to the midpoint of the second power supply port P2 and the power consumption port P3, after the power supply path between the second power supply port P2 and the power consumption port P3 is disconnected, the size of the first resistor R1 can affect the speed of releasing or attracting charges by the gate G of the first MOS transistor Q1, so that the closing speed or the opening speed of the gate G of the first MOS transistor can be controlled by adjusting the size of the resistance of the first resistor R1, so that the potential abrupt change caused by the too fast closing speed or the too fast opening speed of the gate G of the first MOS transistor can be avoided, and the impact of the potential abrupt change on circuit components is reduced.
As an example, the first resistor R1 may be a variable resistor.
As shown in fig. 6, the power supply switching circuit further includes a second conducting portion 400 and a second switch control module 500, where the second conducting portion 400 is connected between the second power supply port P2 and the power consumption port P3, and is used for conducting or cutting off a power supply path between the second power supply port P2 and the power consumption port P3; the second switch control module 500 is connected with the second conduction part 400, so that based on the second switch control module 500, the second conduction part 400 is autonomously controlled to conduct or cut off a power supply path between the second power supply port P2 and the power consumption port P3, and the power supply port of the doorbell can be autonomously switched between the second power supply port P2 and the first power supply port P1, so that the doorbell power supply source is autonomously switched.
As shown in fig. 7, the second conducting portion 400 includes a second MOS transistor Q2, the second MOS transistor Q2 and a second switch control module 500, a source S of the second MOS transistor Q2 is connected to the second power supply port P2, a drain D of the second MOS transistor is connected to the power consumption port P3, and a gate G of the second MOS transistor Q2 is connected to the second switch control module 500.
The second switch control module 500 is configured to control the gate G of the second MOS transistor Q2 to be closed or opened in response to an external control signal, and after the gate G of the second MOS transistor Q2 is opened, the power supply path between the second power supply port P2 and the power consumption port P3 is opened, and the first switch control module 300 will control the gate G of the first MOS transistor to be closed, and the power supply path between the first power supply port P1 and the power consumption port P3 is opened; after the gate G of the second MOS transistor Q2 is closed, the power supply path between the second power supply port P2 and the power consumption port P3 is turned on, and at this time, the first switch control module 300 will control the gate G of the first MOS transistor to be opened, and the power supply path between the first power supply port P1 and the power consumption port P3 is opened. Therefore, the power supply port of the doorbell can be automatically switched from the second power supply port P2 to the first power supply port P1, and the automatic switching of the power supply of the doorbell is realized.
As shown in fig. 8, the second switch control module 500 includes a second resistor R2, a triode Q3, and a third resistor R3, wherein a base 1 of the triode Q3 is connected to one end of the second resistor R2, an emitter 2 of the triode Q3 is grounded, a collector 3 of the triode Q3 is connected to a gate G of the second MOS transistor Q2, the other end of the second resistor R2 is connected to a signal input port P4, one end of the third resistor R3 is connected to the base 1 of the triode Q3, and the other end of the third resistor R3 is grounded; the second resistor R2 can play a role in limiting current, and can prevent the transistor Q3 from being damaged due to overlarge current output by the signal input port P4; the third resistor R3 plays a role of pulling down the voltage, and can pull down the voltage on the base electrode of the triode Q3 by leading the charge on the base electrode 1 of the triode Q3 into the ground, so that when the signal input port P4 does not stably output the control signal or does not output the control signal, the triode Q3 is prevented from being triggered by mistake, that is, when the signal input port P4 does not stably output the control signal or does not output the control signal, the triode Q3 is ensured not to be turned on.
As an example, the second MOS transistor Q2 may be a low-voltage MOS transistor.
The signal input port P4 is configured to output a control signal to the transistor Q3, where the control signal may control the base 1 of the transistor Q3 to be closed or opened, so as to control the transistor Q3 to be closed or opened; when the triode Q3 is closed, the grid G of the second MOS tube Q2 is grounded, charges on the grid G of the second MOS tube Q2 are led into the ground, so that the grid G of the second MOS tube Q2 is converted from a high-voltage state to a low-voltage state, the grid G of the second MOS tube Q2 is closed at the moment, the second MOS tube Q2 is conducted, and the second power supply port P2 supplies power to the power utilization port P3 through the second MOS tube Q2.
When the triode Q3 is opened, the second power supply port P2 charges the grid G of the second MOS tube Q2, charges on the grid G of the second MOS tube Q2 are gradually accumulated, so that the grid G of the second MOS tube Q2 is converted into a high-voltage state from a low-voltage state, the grid G of the second MOS tube Q2 is opened at the moment, the second MOS tube Q2 is disconnected, a power supply channel between the second power supply port P2 and the power utilization port P3 is disconnected, at the moment, one end of the discharge resistor R0 is connected with the grid G of the first MOS tube Q1, the other end of the discharge resistor R0 is grounded, and the charges on the grid G of the first MOS tube Q1 can be led into the ground through the discharge resistor R0, and therefore the grid voltage of the first MOS tube Q1 can be pulled down, the grid G of the first MOS tube Q1 is converted into the low-voltage state from the high-voltage state, the grid G of the first MOS tube Q1 is closed at the moment, the first MOS tube Q1 is connected with the power utilization port P3, and the first power supply port P1 can be switched to the power utilization port P3, and the first power supply port P2 can be switched independently, and the autonomous power supply can be switched.
As an example, the signal input port P4 may output a control signal in response to an operation action of the user on the terminal, which may be a click operation action or a slide operation action, for selecting the first power supply port P1 or the second power supply port P2 to supply power to the doorbell.
It will be appreciated that the second switch control module 500 may take other forms, and is not limited to the form already mentioned in the above embodiment, as long as it can perform the function of switching on or off the power supply path between the second power supply port P2 and the power consumption port P3.
As shown in fig. 9, the power supply switching circuit further includes a fourth resistor R4, a first capacitor C1, and a second capacitor C2; one end of the fourth resistor R4 is connected with the collector 3 of the triode Q3, and the other end of the fourth resistor R4 is connected with the grid G of the second MOS tube Q2; one end of the first capacitor C1 is connected with the source electrode S of the second MOS tube Q2, and the other end of the first capacitor C1 is connected with the grid electrode G of the second MOS tube Q2; one end of the second capacitor C2 is connected with the drain electrode D of the second MOS tube Q2, and the other end of the second capacitor C2 is connected with the grid electrode G of the second MOS tube Q2. Thus, the fourth resistor R4, the first capacitor C1, the fourth resistor R4 and the second capacitor C2 form 2 RC circuits, delay control of the second MOS tube Q2 can be realized through the 2 RC circuits, and the length of potential linear change time in the opening or closing process of the second MOS tube Q2 can be adjusted through adjusting the resistance value of the fourth resistor R4 and the capacitance of the first capacitor C1 and the second capacitor C2, so that software start of the circuit can be realized, impact to electric elements due to sudden potential change is reduced, and the effect of protecting the electric elements in the circuit is achieved.
As shown in fig. 10, the power supply switching circuit further includes a fifth resistor R5, one end of the fifth resistor R5 is connected to the collector 3 of the triode Q3, the other end of the fifth resistor R5 is connected to the second power supply port P2, and the fifth resistor R5 has a function of pulling up the resistor, so that the potential safety hazard that the second power supply port P2 is directly grounded after the triode Q3 is closed can be avoided.
In one embodiment, a doorbell is provided, including doorbell body, doorbell power supply circuit and above-mentioned power supply switching circuit, doorbell power supply circuit is connected with power supply switching circuit through power consumption port P3. The structure of the power supply switching circuit may be set with reference to the above embodiment, and will not be described again.
In the description of the present specification, reference to the term "some embodiments," "other embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the present utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of the utility model should be assessed as that of the appended claims.
Claims (11)
1. A power supply switching circuit for a doorbell, comprising:
the first power supply module comprises a first power supply port and a first conduction part, wherein the first conduction part is connected between the first power supply port and the power utilization port and is used for conducting or disconnecting a power supply passage between the first power supply port and the power utilization port;
the second power supply module comprises a second power supply port, and the second power supply port is connected with the first conducting part and the power utilization port;
and the first switch control module is attached between the second power supply port and the first conduction part, and controls the first conduction part to conduct the power supply path between the first power supply port and the power utilization port when the power supply path between the second power supply port and the power utilization port is disconnected.
2. The power supply switching circuit according to claim 1, wherein the first conducting portion includes a first MOS transistor;
the drain electrode of the first MOS tube is connected with the first power supply port, the source electrode of the first MOS tube is connected with the power utilization port, and the grid electrode of the first MOS tube is connected between the power utilization port and the second power supply port;
the first switch control module is attached between the second power supply port and the grid electrode of the first MOS tube, and when the power supply passage between the second power supply port and the power utilization port is disconnected, the first switch control module controls the grid electrode of the first MOS tube to be closed so as to conduct the power supply passage between the first power supply port and the power utilization port.
3. The power switching circuit of claim 2, wherein the first switch control module comprises a discharge resistor;
one end of the discharging resistor is connected between the second power supply port and the grid electrode of the first MOS tube, the other end of the discharging resistor is grounded, and when a power supply passage between the second power supply port and the power utilization port is disconnected, the discharging resistor pulls down the grid electrode voltage of the first MOS tube and controls the grid electrode of the first MOS tube to be closed.
4. The power switching circuit of claim 3, wherein the power switching circuit comprises a first diode and a second diode;
one end of the first diode is connected with the second power supply port, and the other end of the first diode is connected with the power utilization port;
one end of the second diode is connected with the drain electrode of the first MOS tube, and the other end of the second diode is connected with the source electrode of the first MOS tube.
5. The power supply switching circuit according to any one of claims 3 to 4, further comprising a first resistor;
one end of the first resistor is connected with the grid electrode of the first MOS tube, the other end of the first resistor is connected between the power utilization port and the second power supply port, and the first resistor is used for controlling the closing speed or the opening speed of the grid electrode of the first MOS tube.
6. The power supply switching circuit according to claim 1, wherein the power supply switching circuit further comprises;
the second conduction part is connected between the second power supply port and the power utilization port and is used for conducting or cutting off a power supply path between the second power supply port and the power utilization port;
the second switch control module is connected with the second conduction part and used for controlling the second conduction part to conduct or cut off a power supply passage between the second power supply port and the power utilization port.
7. The power supply switching circuit according to claim 6, wherein the second conducting portion includes a second MOS transistor;
the source electrode of the second MOS tube is connected with the second power supply port, and the drain electrode of the second MOS tube is connected with the power utilization port;
the second switch control module is connected with the grid electrode of the second MOS tube and is used for controlling the second conduction part to conduct or cut off a power supply passage between the second power supply port and the power utilization port by controlling the grid electrode of the second MOS tube to be closed or opened.
8. The power switching circuit of claim 7, wherein the second switch control module comprises a second resistor, a triode, and a third resistor;
one end of the second resistor is connected with a signal input port, the other end of the second resistor is connected with the base electrode of the triode, the signal input port is used for outputting a control signal to the triode, and the control signal is used for controlling the triode to be closed or opened;
one end of the third resistor is connected with the base electrode of the triode, and the other end of the third resistor is connected with the emitter electrode of the triode;
the emitter of the triode is grounded, the collector of the triode is connected with the grid electrode of the second MOS tube, and the triode is used for controlling the grid electrode of the second MOS tube to be closed by pulling down the grid voltage of the second MOS tube when the triode is closed.
9. The power switching circuit of claim 8, further comprising a fourth resistor, a first capacitor, and a second capacitor;
one end of the fourth resistor is connected with the collector electrode of the triode, and the other end of the fourth resistor is connected with the grid electrode of the second MOS tube;
one end of the first capacitor is connected with the source electrode of the second MOS tube, and the other end of the first capacitor is connected with the grid electrode of the second MOS tube;
one end of the second capacitor is connected with the drain electrode of the second MOS tube, and the other end of the second capacitor is connected with the grid electrode of the second MOS tube.
10. The power supply switching circuit of claim 9, further comprising a fifth resistor;
one end of the fifth resistor is connected with the collector electrode of the triode, and the other end of the fifth resistor is connected with the second power supply port.
11. A doorbell comprising a doorbell body, a doorbell power supply circuit and a power supply switching circuit according to any one of claims 1 to 10, the doorbell power supply circuit being connected to the power supply switching circuit via the power usage port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321995952.2U CN220440421U (en) | 2023-07-26 | 2023-07-26 | Power supply switching circuit and doorbell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321995952.2U CN220440421U (en) | 2023-07-26 | 2023-07-26 | Power supply switching circuit and doorbell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220440421U true CN220440421U (en) | 2024-02-02 |
Family
ID=89694207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321995952.2U Active CN220440421U (en) | 2023-07-26 | 2023-07-26 | Power supply switching circuit and doorbell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220440421U (en) |
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2023
- 2023-07-26 CN CN202321995952.2U patent/CN220440421U/en active Active
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