CN218920268U - Voltage selection circuit, power supply circuit and electronic equipment - Google Patents
Voltage selection circuit, power supply circuit and electronic equipment Download PDFInfo
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- CN218920268U CN218920268U CN202223107338.6U CN202223107338U CN218920268U CN 218920268 U CN218920268 U CN 218920268U CN 202223107338 U CN202223107338 U CN 202223107338U CN 218920268 U CN218920268 U CN 218920268U
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Abstract
The application discloses a voltage selection circuit, a power supply circuit and electronic equipment, and relates to the technical field of power supply. The voltage selection circuit includes: the first switch circuit is connected in series between the input end and the first electric module; the second switch circuit is connected in series between the input end and the second power utilization module; the first switch control circuit is connected with the first switch circuit, the second switch circuit and the input end and is used for controlling the first switch circuit to be turned on and controlling the second switch circuit to be turned off under the condition that the input voltage is larger than or equal to a first threshold value and controlling the first switch circuit to be turned off and controlling the second switch circuit to be turned on under the condition that the input voltage is smaller than the first threshold value, so that the input voltage with the corresponding value is provided for the corresponding power utilization module. The voltage selection circuit provided by the embodiment of the application has the advantages that different input voltages share the same input end, and the whole circuit is simple in structure, easy to realize and low in cost.
Description
Technical Field
The application belongs to the technical field of power supply, and particularly relates to a voltage selection circuit, a power supply circuit and electronic equipment.
Background
In some electronic devices, different subsequent processing needs to be performed for different input voltages, for example, different input voltages are provided to different power usage modules. As one example, a first input voltage needs to be provided for use by a first power module and a second input voltage needs to be provided for use by a second power module. For example, the first power module includes a main control chip, a sensor, or an LED (light-emitting diode), and the second power module includes an LED driving circuit.
However, if the first input voltage is provided to the second power module for use, or the second input voltage is provided to the first power module for use, the first power module or the second power module cannot operate normally, and there is a possibility that the modules may be damaged due to voltage mismatch. Therefore, how to provide the input voltages with corresponding values to the corresponding power utilization modules for use becomes a technical problem to be solved by those skilled in the art.
Disclosure of Invention
The application provides a voltage selection circuit, a power supply circuit and electronic equipment, and aims to solve the problem of how to provide input voltages with corresponding values for corresponding power utilization modules.
In a first aspect of an embodiment of the present application, there is provided a voltage selection circuit, including:
the first switch circuit is connected in series between the input end and the first electric module, and the input end is used for receiving input voltage;
the second switch circuit is connected in series between the input end and the second power utilization module, and the power utilization voltages required by the first power utilization module and the second power utilization module are different;
the first switch control circuit is connected with the first switch circuit, the second switch circuit and the input end and is used for controlling the first switch circuit to be turned on and controlling the second switch circuit to be turned off under the condition that the input voltage is larger than or equal to a first threshold value and controlling the first switch circuit to be turned off and controlling the second switch circuit to be turned on under the condition that the input voltage is smaller than the first threshold value.
As an optional implementation manner of the first aspect, the first switch control circuit includes two sub-switch control circuits, one sub-switch control circuit is connected to the first switch circuit and the input terminal, and the other sub-switch control circuit is connected to the second switch circuit and the input terminal;
the sub-switch control circuit is connected with the first switch circuit and used for controlling the first switch circuit to be turned on when the input voltage is larger than or equal to a first threshold value and controlling the first switch circuit to be turned off when the input voltage is smaller than the first threshold value;
The sub-switch control circuit connected with the second switch circuit is used for controlling the second switch circuit to be turned off when the input voltage is larger than or equal to the first threshold value, and is used for controlling the second switch circuit to be turned on when the input voltage is smaller than the first threshold value.
As an optional implementation manner of the first aspect, at least one of the two sub-switch control circuits includes:
the first end of the first voltage dividing device is connected with the input end;
the second end of the second voltage division device is grounded;
the third switching circuit is connected in series between the second end of the first voltage dividing device and the first end of the second voltage dividing device;
the voltage stabilizing circuit is connected in series between the input end and the ground and is provided with a voltage stabilizing output end which is connected with the third switch circuit;
the second end of the first voltage dividing device in the sub-switch control circuit connected with the first switch circuit is connected with the first switch circuit, and/or the first end of the second voltage dividing device in the sub-switch control circuit connected with the second switch circuit is connected with the second switch circuit;
when the input voltage is greater than or equal to a first threshold value, the voltage stabilizing circuit is conducted, the voltage of the voltage stabilizing output end is equal to the voltage stabilizing voltage, and the voltage stabilizing circuit is used for controlling the third switch circuit to be conducted, and the first threshold value is greater than the voltage stabilizing voltage;
And under the condition that the input voltage is smaller than the first threshold value, the voltage stabilizing circuit is turned off, and the voltage of the voltage stabilizing output end is equal to the input voltage and is used for controlling the third switching circuit to be turned off.
As an optional implementation manner of the first aspect, the voltage stabilizing circuit includes a third voltage dividing device and a voltage stabilizing diode connected in series, a first end of the third voltage dividing device is connected with the input end, a second end of the third voltage dividing device is connected with a cathode of the voltage stabilizing diode, an anode of the voltage stabilizing diode is grounded, and a cathode of the voltage stabilizing diode is a voltage stabilizing output end.
As an optional implementation manner of the first aspect, the sub-switch control circuit further includes:
and the current limiting circuit is connected in series between the voltage stabilizing output end and the third switching circuit.
A second aspect of an embodiment of the present application provides a power supply circuit, including the voltage selection circuit provided in the first aspect.
As an optional implementation manner of the second aspect, the power supply circuit further includes:
and the switching circuit is connected with the first power supply, the second power supply and the input end and is used for controlling the first power supply to be connected with the input end or controlling the second power supply to be connected with the input end, wherein the first power supply is used for providing an input voltage which is greater than or equal to a first threshold value, and the second power supply is used for providing an input voltage which is smaller than the first threshold value.
As an optional implementation manner of the second aspect, the power supply circuit further includes:
the first conversion circuit is connected in series between the first switch circuit and the first electric module and is used for converting the input voltage into a first power utilization voltage and providing the first power utilization voltage for the first electric module; and/or the number of the groups of groups,
and the second conversion circuit is connected in series between the second switching circuit and the second power utilization module and is used for converting the input voltage into the second power utilization voltage and providing the second power utilization voltage for the second power utilization module.
As an optional implementation manner of the second aspect, the power supply circuit further includes:
a detection circuit connected in series between the first switch circuit and the first electric module, for outputting a detection voltage based on the input voltage before outputting the input voltage to the first electric module, to detect an impedance value between an output terminal of the detection circuit and ground, and for outputting the input voltage, the detection voltage being smaller than the input voltage, in a case where it is detected that the impedance value between the output terminal of the detection circuit and ground is equal to a preset value;
the impedance circuit is connected in series between the output end of the detection circuit and the ground, and the impedance value of the impedance circuit is equal to a preset value;
the fifth switch circuit is connected in series between the grounding end of the first electric module and the ground;
And the second switch control circuit is connected with the detection circuit and the fifth switch circuit and is used for controlling the fifth switch circuit to be turned on under the condition that the detection circuit outputs an input voltage and controlling the fifth switch circuit to be turned off under the condition that the detection circuit outputs a detection voltage.
A third aspect of embodiments of the present application provides an electronic device, including the voltage selection circuit provided in the first aspect, or including the power supply circuit provided in the second aspect.
Compared with the prior art, the embodiment of the utility model has the beneficial effects that:
when the input voltage is greater than or equal to a first threshold value, the voltage selection circuit controls the first switch circuit to be turned on and controls the second switch circuit to be turned off through the first switch control circuit, so that the input end provides the input voltage for the first electric module to use. And under the condition that the input voltage is smaller than a first threshold value, the voltage selection circuit controls the first switch circuit to be turned off and controls the second switch circuit to be turned on through the first switch control circuit, so that the input end provides the input voltage for the second power utilization module. The voltage selection circuit provided by the embodiment of the utility model has the advantages that different input voltages share the same input end, so that the input voltage which is larger than or equal to the first threshold value can be provided for the first power utilization module to be used, the input voltage which is smaller than the first threshold value is provided for the second power utilization module to be used, the problem of how to provide the input voltage with the corresponding value for the corresponding power utilization module to be used is solved, and the voltage selection circuit can be obtained by building the first switch circuit, the second switch circuit and the first switch control circuit, and the whole circuit has simple structure, is easy to realize and has low cost.
Drawings
FIG. 1 is a schematic diagram of a voltage selection circuit according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a voltage selection circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a first sub-switch control circuit according to an embodiment of the present application;
fig. 4 is a schematic power supply diagram of a first power module according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a second sub-switch control circuit according to an embodiment of the present application;
fig. 6 is a schematic power supply diagram of a second power module according to an embodiment of the present disclosure;
FIG. 7 is a schematic diagram of a voltage selection circuit according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a power supply circuit according to an embodiment of the present disclosure;
fig. 9 is a schematic structural diagram of a power supply circuit according to an embodiment of the present disclosure;
fig. 10 is a schematic structural diagram of a power supply circuit according to an embodiment of the present disclosure;
fig. 11 is a schematic structural diagram of a power supply circuit applied to a first electric module according to an embodiment of the present disclosure;
fig. 12 is a schematic structural diagram of an impedance circuit, a second switch control circuit and a fifth switch circuit according to an embodiment of the present application.
Illustration of:
10. an input end; 11. a first switch control circuit; 110. a first regulated output; 111. a first voltage stabilizing circuit; 112. a first voltage dividing device; 113. a third switching circuit; 114. a second voltage dividing device; 12. a first switching circuit; 13. a first electrical module; 14. a second switching circuit; 15. the second electricity utilization module; 16. a first sub-switch control circuit; 160. a second regulated output; 161. a second voltage stabilizing circuit; 162. a third voltage dividing device; 163. a fourth switching circuit; 164. a fourth voltage dividing device; 17. a third power module; 18. a fourth power module; 19. a second sub-switch control circuit; 20. a switching circuit; 31. a first conversion circuit; 32. a second conversion circuit; 41. a detection circuit; 42. an impedance circuit; 43. a second switch control circuit; 44. a fifth switching circuit; r1, a first resistor; r2, a second resistor; r3, a third resistor; r4, a fourth resistor; r5, a fifth resistor; r6, a sixth resistor; r7, a seventh resistor; r8, eighth resistor; r9, ninth resistor; r10, tenth resistor; r11, eleventh resistor; C. a capacitor; q1, a first switching tube; q2, a second switching tube; q3, a third switching tube; q4, a fourth switching tube; q5, a fifth switching tube; ZD1, a first zener diode; ZD2, a second zener diode; DZ3, a third zener diode; DZ4, fourth zener diode.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved by the present application more clear, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In some electronic devices, different subsequent processing needs to be performed for different input voltages, for example, different input voltages are provided to different power usage modules. As one example, a first input voltage needs to be provided for use by a first power module and a second input voltage needs to be provided for use by a second power module. For example, the first power module includes a main control chip, a sensor, or an LED (light-emitting diode), and the second power module includes an LED driving circuit.
However, if the first input voltage is provided to the second power module for use, or the second input voltage is provided to the first power module for use, the first power module or the second power module cannot operate normally, and there is a possibility that the modules may be damaged due to voltage mismatch. Therefore, how to provide the input voltages with corresponding values to the corresponding power utilization modules for use becomes a technical problem to be solved by those skilled in the art.
In view of this, the embodiments of the present application provide a voltage selection circuit, a power supply circuit, and an electronic device, which can solve the problem of how to provide input voltages with corresponding values to corresponding power utilization modules.
The voltage selection circuit provided by the embodiment of the application can be obtained through the construction of the first switch circuit, the second switch circuit and the first switch control circuit, and different input voltages can share the same voltage input end, so that the whole circuit is simple in structure, easy to realize and low in cost. The voltage selection circuit is used for providing the input voltage to the first power module for use if the input voltage is greater than or equal to a first threshold value, and is used for providing the input voltage to the second power module for use if the input voltage is less than the first threshold value.
In order to illustrate the technical solutions described in the present application, the following description is made by specific examples.
Fig. 1 shows a schematic diagram of a voltage selection circuit according to an embodiment of the present application, where the voltage selection circuit includes an input terminal 10, and a first switch control circuit 11, a first switch circuit 12, and a second switch circuit 14 connected to the input terminal 10, and the input terminal 10 is configured to receive an input voltage.
The first switching circuit 12 is used to switch the path between the input 10 and the first electrical module 13. When the first switching circuit 12 is turned on, the input voltage is used as the power consumption voltage of the first power module 13. In the case of the first switching circuit 12 being switched off, this means that the first electrical module 13 is disconnected from the input 10, and the first electrical module 13 cannot acquire a voltage via the input 10.
The second switching circuit 14 is used to switch the path between the input 10 and the second power module 15. When the second switching circuit 14 is turned on, the input voltage is used as the power consumption voltage of the second power consumption module 15. When the second switching circuit 14 is turned off, it means that the second power module 15 is disconnected from the input 10, and the second power module 15 cannot acquire a voltage through the input 10. The power consumption voltages of the first power consumption module 13 and the second power consumption module 15 are different, for example, the power consumption voltage of the first power consumption module is 44-57V, and the power consumption voltage of the second power consumption module 15 is 12-24V.
The first switch control circuit 11 is further connected to control ends of the first switch circuit 12 and the second switch circuit 14, and is configured to control the first switch circuit 12 to be turned on and the second switch circuit 14 to be turned off when the input voltage is greater than or equal to a first threshold value, and to control the first switch circuit 12 to be turned off and the second switch circuit 14 to be turned on when the input voltage is less than the first threshold value. Alternatively, the first threshold is 30V to 40V, for example 36V.
Therefore, in the case where the input voltage is greater than or equal to the first threshold value, the input voltage is used as the power consumption voltage of the first power module 13. In the case that the input voltage is smaller than the first threshold value, the input voltage is used as the power consumption voltage of the second power consumption module 15. The different input voltages share the same input 10, i.e. the first power module 13 and the second power module 15 each obtain the required power voltage from the input 10.
Note that, in the embodiment of the present application, the structures of the first switch circuit 12, the second switch circuit 14, and the first switch control circuit 11, and the values of the input voltage and the first threshold value are not particularly limited, and a skilled person may select the values according to needs.
As an example, the switching functions of both the first switching circuit 12 and the second switching circuit 14 may be implemented by electronic switches. For example, the electronic switch includes a bipolar junction transistor (Bipolar Junction Transistor, BJT), a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT), and the like.
In summary, in the voltage selection circuit provided in the embodiment of the present application, different input voltages share the same input terminal 10, so that not only can the input voltage greater than or equal to the first threshold be provided to the first power module 13 for use, but also the input voltage smaller than the first threshold be provided to the second power module 15 for use, so as to solve the problem of how to provide the input voltage with the corresponding value to the corresponding power module for use, and the voltage selection circuit can be obtained by building the first switch circuit 12, the second switch circuit 14 and the first switch control circuit 11, and the overall circuit structure is simple, easy to implement and low in cost.
In some embodiments, the first switch control circuit 11 comprises two sub-switch control circuits, one sub-switch control circuit connecting the first switch circuit 12 and the input 10, and the other sub-switch control circuit connecting the second switch circuit 14 and the input 10.
As shown in fig. 2, as an example, the first switch control circuit 11 includes a first sub-switch control circuit 16 and a second sub-switch control circuit 19.
The first sub-switch control circuit 16 connected to the first switch circuit 12 is configured to control the first switch circuit 12 to be turned on when the input voltage is greater than or equal to a first threshold value, and to control the first switch circuit 12 to be turned off when the input voltage is less than the first threshold value.
The second sub-switch control circuit 19 connected to the second switch circuit 14 is configured to control the second switch circuit 14 to be turned off when the input voltage is greater than or equal to the first threshold value, and to control the second switch circuit 14 to be turned on when the input voltage is less than the first threshold value.
In the embodiment of the present application, the structures of the first sub-switch control circuit 16 and the second sub-switch control circuit 19 are not specifically limited, and the circuit structures of the first sub-switch control circuit 16 and the second sub-switch control circuit 19 may be the same or different.
As an example, the control functions of the first sub-switch control circuit 16 and the second sub-switch control circuit 19 may each be implemented by a voltage stabilizing circuit or a comparing circuit.
In some embodiments, when the first sub-switch control circuit 16 includes a first comparison circuit, the magnitude relationship between the input voltage and the first threshold may be compared by the first comparison circuit. When the input voltage is greater than or equal to the first threshold value, the first comparison circuit outputs a first control signal for controlling the first switch circuit 12 to be turned on. When the input voltage is smaller than the first threshold value, the first comparison circuit outputs a second control signal for controlling the first switching circuit 12 to be turned off.
In some embodiments, when the second sub-switch control circuit 19 includes a second comparison circuit, the magnitude relation between the input voltage and the first threshold value may be compared by the second comparison circuit. When the input voltage is greater than or equal to the first threshold, the second comparison circuit outputs a third control signal for controlling the second switching circuit 14 to be turned off. When the input voltage is smaller than the first threshold value, the second comparison circuit outputs a fourth control signal for controlling the second switch circuit 14 to be turned on.
The operation principle of the voltage selection circuit provided in the embodiment of the present application will be described below by taking the same circuit structure of the first sub-switch control circuit 16 and the second sub-switch control circuit 19 as an example.
Fig. 3 shows a schematic structural diagram of a first sub-switch control circuit 16 according to an embodiment of the present application, where the first sub-switch control circuit 16 includes a first voltage stabilizing circuit 111 having a first voltage stabilizing output terminal 110, a first voltage dividing device 112, a third switch circuit 113, and a second voltage dividing device 114.
A first terminal of the first voltage stabilizing circuit 111 is connected to the input terminal 10, and a second terminal of the first voltage stabilizing circuit 111 is grounded. In the case where the first voltage stabilizing circuit 111 is on, the voltage of the first voltage stabilizing output terminal 110 is equal to the first voltage stabilizing voltage. In the case where the first voltage stabilizing circuit 111 is turned off, the voltage of the first voltage stabilizing output terminal 110 is equal to the input voltage, and the first threshold is greater than the first voltage stabilizing voltage. A first end of the first voltage dividing device 112 is connected to the input terminal 10, a second end of the first voltage dividing device 112 is connected to the control terminal of the first switching circuit 12, and a second end of the second voltage dividing device is grounded. The first regulated output 110 is connected to a control terminal of a third switching circuit 113, the third switching circuit 113 being configured to switch a path between the second terminal of the first voltage divider 112 and the first terminal of the second voltage divider 114.
It should be noted that, the meaning of the first regulated voltage is that, when the first voltage stabilizing circuit 111 is turned on, the voltage of the first regulated output terminal 110 is equal to the first regulated voltage with a fixed value, regardless of the magnitude of the input voltage.
The control principle of the first sub-switch control circuit 11 provided in this embodiment is as follows:
(1) In the case that the input voltage is greater than or equal to the first threshold value, the first voltage stabilizing circuit 111 is turned on, the voltage of the first voltage stabilizing output terminal 110 is equal to the first voltage stabilizing voltage, so that a first voltage difference exists between the input terminal 10 and the first voltage stabilizing output terminal 110, and the first voltage difference is enough to control the third switching circuit 113 to be turned on, so that the voltage of the second terminal of the first voltage dividing device 112 is pulled down, so that a second voltage difference exists between the input terminal 10 and the second terminal of the first voltage dividing device 112, and the second voltage difference is enough to control the first switching circuit 12 to be turned on, and finally, the input voltage is output to the first electric module 13 through the first switching circuit 12.
(2) In the case that the input voltage is smaller than the first threshold, the first voltage stabilizing circuit 111 is turned off, the voltage of the first voltage stabilizing output terminal 110 is equal to the input voltage, so that there is no voltage difference between the input terminal 10 and the first voltage stabilizing output terminal 110 to control the third switching circuit 113 to be turned off, so that the voltage of the second terminal of the first voltage dividing device 112 is equal to the input voltage, so that there is no voltage difference between the input terminal 10 and the second terminal of the first voltage dividing device 112 to control the first switching circuit 12 to be turned off, and finally, the input voltage cannot be output to the first electric module 13 through the first switching circuit 12.
The structures of the first voltage stabilizing circuit 111, the first voltage dividing device 112, the third switch circuit 113, and the second voltage dividing device 114 are not particularly limited in this embodiment, and a skilled person may select as needed.
As an example, the first voltage dividing device 112 includes one resistor, or includes a plurality of resistors connected in series or parallel to each other.
As an example, the second voltage divider 114 includes one resistor, or a plurality of resistors connected in series or parallel with each other.
As an example, the third switching circuit 113 is similar to the first switching circuit 12, and its switching function may also be realized by an electronic switch.
As shown in fig. 4, as an example, the first voltage stabilizing circuit 111 includes a first resistor R1 and a first voltage stabilizing diode ZD1, the first switching circuit 12 includes a first switching transistor Q1, the third switching circuit 113 includes a third switching transistor Q3, the first voltage dividing device 112 includes a second resistor R2, and the second voltage dividing device 114 includes a fourth resistor R4. Alternatively, the first resistor R1 may be replaced by another voltage dividing device.
The first end of the first resistor R1 is connected to the input terminal 10, the second end of the first resistor R1 is connected to the cathode of the first zener diode ZD1, and the anode of the first zener diode ZD1 is grounded. The cathode of the first zener diode ZD1 is the first zener output 110.
The second end of the first resistor R1 is also connected to the base of the third switching tube Q3. Optionally, the second end of the first resistor R1 is connected to the base of the third switching tube Q3 through the first current limiting circuit, so as to limit the current of the base and prevent the current of the base from being too large. Optionally, the first current limiting circuit includes a third resistor R3, and two ends of the third resistor R3 are respectively connected to the cathode of the first zener diode ZD1 and the base of the third switching tube Q3.
The first end of the second resistor R2, the input end 10 and the source electrode of the first switch tube Q1 are connected, the drain electrode of the first switch tube Q1 is connected with the first electric module 13, the second end of the second resistor R2, the grid electrode of the first switch tube Q1 and the emitter electrode of the third switch tube Q3 are connected, the collector electrode of the third switch tube Q3 is connected with the first end of the fourth resistor R4, and the second end of the fourth resistor R4 is grounded.
As an example, the regulated value of the first zener diode ZD1 is the first regulated voltage. For example, the voltage stabilizing value of the first zener diode ZD1 is 36V. When the input voltage is 44-57V (e.g. 48V), the first zener diode ZD1 is turned on, and the voltage of the first regulated output terminal 110 is 36V, so that the voltage difference between the emitter and the base of the third switching tube Q3 reaches 12V, and the third switching tube Q3 is turned on. Under the condition that the third switching tube Q3 is turned on, the voltage of the second end of the second resistor R2 is smaller than 44-57V (e.g., 48V), so that the voltage difference between the source electrode and the gate electrode of the first switching tube Q1 is larger than the turn-on threshold voltage of the first switching tube Q1, and the first switching tube Q1 is turned on.
As an example, when the input voltage is 12 to 24V (e.g., 24V), the first zener diode ZD1 is turned off, and the voltage of the first zener output terminal 110 is 12 to 24V (e.g., 24V), so that the voltage difference between the emitter and the base of the third switching tube Q3 is 0, thereby turning off the third switching tube Q3. Under the condition that the third switching tube Q3 is turned off, the voltage of the second end of the second resistor R2 is equal to 12-24V (e.g., 24V), so that the voltage difference between the source electrode and the gate electrode of the first switching tube Q1 is 0, and the first switching tube Q1 is turned off.
Fig. 5 shows a schematic structural diagram of a second sub-switch control circuit 19 according to an embodiment of the present application, where the second sub-switch control circuit 19 includes a second voltage stabilizing circuit 161 having a second voltage stabilizing output terminal 160, a third voltage dividing device 162, a fourth switch circuit 163, and a fourth voltage dividing device 164.
The first end of the second voltage stabilizing circuit 161 is connected to the input terminal 10, and the second end of the second voltage stabilizing circuit 161 is grounded. With the second voltage stabilizing circuit 161 on, the voltage at the second voltage stabilizing output terminal 160 is equal to the second voltage stabilizing voltage. In the case where the second voltage stabilizing circuit 161 is turned off, the voltage of the second voltage stabilizing output terminal 160 is equal to the input voltage, and the first threshold is greater than the second voltage stabilizing voltage. The first terminal of the third voltage dividing device 162 is connected to the control terminal of the second switching circuit 14, the second terminal of the third voltage dividing device 162 is grounded, and the first terminal of the fourth voltage dividing device 164 is connected to the input terminal 10. The second regulated output 160 is connected to a control terminal of a fourth switching circuit 163, the fourth switching circuit 163 being arranged to switch a path between a first terminal of a third voltage dividing device 162 and a second terminal of a fourth voltage dividing device 164.
It should be noted that the meaning of the second regulated voltage is that, when the second voltage stabilizing circuit 161 is turned on, the voltage of the second regulated output 160 is equal to the second regulated voltage with a fixed value, regardless of the magnitude of the input voltage. Alternatively, the values of the second regulated voltage and the first regulated voltage may be the same or different.
The control principle of the second sub-switch control circuit 16 provided in this embodiment is:
(1) In the case that the input voltage is greater than or equal to the first threshold, the second voltage stabilizing circuit 161 is turned on, the voltage of the second voltage stabilizing output terminal 160 is equal to the second voltage stabilizing voltage, such that a third voltage difference exists between the input terminal 10 and the second voltage stabilizing output terminal 160, and the third voltage difference is sufficient to control the fourth circuit 163 to be turned on, so as to pull up the voltage of the first terminal of the third voltage dividing device 162, so as to reduce the fourth voltage difference existing between the input terminal 10 and the first terminal of the third voltage dividing device 162, such that the reduced fourth voltage difference is insufficient to control the second switch circuit 14 to be turned on, i.e., the reduced fourth voltage difference controls the second switch circuit 14 to be turned off.
(2) In the case that the input voltage is smaller than the first threshold, the second voltage stabilizing circuit 161 is turned off, and the voltage of the second voltage stabilizing output terminal 160 is equal to the input voltage, so that there is no voltage difference between the input terminal 10 and the second voltage stabilizing output terminal 160 to control the fourth switch circuit 163 to be turned off, so that the fourth voltage difference between the input terminal 10 and the first terminal of the third voltage dividing device 162 is sufficient to control the second switch circuit 14 to be turned on, and finally, the input voltage is output to the second power consumption module 15 through the second switch circuit 14.
The structures of the second voltage stabilizing circuit 161, the third voltage dividing device 162, the fourth switching circuit 163, and the fourth voltage dividing device 164 are not particularly limited in this embodiment, and a skilled person may select as needed.
As an example, the third voltage dividing device 162 includes one resistor, or includes a plurality of resistors connected in series or parallel to each other.
As an example, the fourth voltage dividing device 164 includes one resistor or a plurality of resistors connected in series or parallel to each other.
As an example, the fourth switch circuit 163 is similar to the second switch circuit 14, and its switching function can also be realized by an electronic switch.
As shown in fig. 6, as an example, the second voltage stabilizing circuit 161 includes a fifth resistor R5 and a second zener diode ZD2, the second switching circuit 14 includes a second switching transistor Q2, the fourth switching circuit 163 includes a fourth switching transistor Q4, the third voltage dividing device 162 includes a sixth resistor R6, and the fourth voltage dividing device 164 includes an eighth resistor R8. Alternatively, the fifth resistor R5 may be replaced by other voltage dividing devices.
The first end of the fifth resistor R5 is connected to the input terminal 10, the second end of the fifth resistor R5 is connected to the cathode of the second zener diode ZD2, and the anode of the second zener diode ZD2 is grounded. The cathode of the second zener diode ZD2 is the second zener output 160.
The second end of the fifth resistor R5 is also connected with the base electrode of the fourth switching tube Q4. Optionally, the second end of the fifth resistor R5 is connected to the base of the fourth switching tube Q4 through a third current limiting circuit, so as to limit the current of the base and prevent the current of the base from being too large. Optionally, the third current limiting circuit includes a seventh resistor R7, and two ends of the seventh resistor R7 are respectively connected to the cathode of the second zener diode ZD2 and the base of the fourth switching tube Q4.
The first end of the sixth resistor R6, the grid electrode of the second switch tube Q2 and the collector electrode of the fourth switch tube Q4 are connected, the source electrode of the second switch tube Q2, the first end of the eighth resistor R8 and the input end 10 are connected, the drain electrode of the second switch tube Q2 is connected with the second power utilization module 15, the second end of the sixth resistor R6 is grounded, and the emitter electrode of the fourth switch tube Q4 is connected with the second end of the eighth resistor R8.
As an example, the regulated value of the second zener diode ZD2 is the second regulated voltage. For example, the voltage stabilizing value of the second zener diode ZD2 is 36V. When the input voltage is 44-57V (e.g. 48V), the second zener diode ZD2 is turned on, and the voltage of the second zener output 160 is 36V, so that the voltage difference between the emitter and the base of the fourth switching tube Q4 reaches 12V, and the fourth switching tube Q4 is turned on. Under the condition that the fourth switching tube Q4 is turned on, the voltage of the first end of the sixth resistor R6 is pulled up, so that the voltage difference between the source electrode and the gate electrode of the second switching tube Q2 is smaller than the on threshold voltage of the second switching tube Q2, and the second switching tube Q2 is turned off.
As an example, when the input voltage is 12 to 24V (e.g., 24V), the second zener diode ZD2 is turned off, and the voltage of the second zener output 160 is 12 to 24V (e.g., 24V), so that the voltage difference between the emitter and the base of the fourth switching tube Q4 is 0, thereby turning off the fourth switching tube Q4. Under the condition that the fourth switching tube Q4 is turned off, the voltage at the first end of the sixth resistor R6 is equal to 0, so that the voltage difference between the source electrode and the gate electrode of the second switching tube Q2 is 12-24V (e.g. 24V), and the second switching tube Q2 is turned on.
Based on the above description, fig. 7 shows a voltage selection circuit provided in an embodiment of the present application. The voltage selection circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, a fourth switching tube Q4, a first zener diode ZD1 and a second zener diode ZD2, wherein the first end of the fifth resistor R5, the input end 10 and the first end of the first resistor R1 are connected.
The voltage selection circuit provided by the embodiment of the application not only can provide the input voltage larger than or equal to the first threshold value for the first power module 13 to use, but also can provide the input voltage smaller than the first threshold value for the second power module 15 to use, and the whole circuit has simple structure, easy realization and low cost.
In another embodiment of the present application, a power supply circuit is provided, which includes the voltage selection circuit provided in any of the above embodiments.
As shown in fig. 8, as an example, the power supply circuit includes a first power supply for supplying a first input voltage greater than or equal to a first threshold value and a second power supply for supplying a second input voltage less than the first threshold value.
When the first power source is connected to the input terminal 10, the power supply circuit transmits a first input voltage provided by the first power source to the first power module 13 for use. When the second power source is connected to the input terminal 10, the power supply circuit transmits the second input voltage provided by the second power source to the second power consumption module 15 for use.
The power supply circuit provided by the embodiment of the application has the beneficial effects that the input voltage larger than or equal to the first threshold value can be provided for the first power module 13 to be used, the input voltage smaller than the first threshold value is provided for the second power module 15 to be used, the problem of how to provide the input voltage with the corresponding value for the corresponding power module to be used is solved, and the whole circuit is simple in structure, easy to realize and low in cost.
Fig. 9 shows a power supply circuit according to an embodiment of the present application, which further includes a switching circuit 20 connected to the first power source, the second power source and the input terminal 10. The switching circuit 20 is used to control the connection of the first power supply to the input 10 or to control the connection of the second power supply to the input 10.
The structure of the switching circuit 20 is not particularly limited in the embodiment of the present application, and a skilled person may select the switching circuit according to need. As an example, the switching circuit 20 may be manually switched, or may be switched based on a control instruction input by a user.
Fig. 10 shows a power supply circuit provided in an embodiment of the present application, and the power supply circuit further includes a first conversion circuit 31 and/or a second conversion circuit 32.
The first conversion circuit 31 is connected in series between the first switch circuit 12 and the first electric module 13, and is configured to convert an input voltage into a first power voltage, and provide the first power voltage to the first electric module 13. The second conversion circuit 32 is connected in series between the second switch circuit 14 and the second power consumption module 15, and is configured to convert the input voltage into a second power consumption voltage, and provide the second power consumption voltage to the second power consumption module 15.
It should be appreciated that in some embodiments, the input voltage may be supplied directly to the first power module 13 or the second power module 15 for use. In other embodiments, the input voltage needs to be converted to a satisfactory voltage before it can be used by the first power module 13 or the second power module 15.
As shown in fig. 10, as an example, the 48V input voltage needs to be converted into the 5V first power voltage before being provided to the first power module 13. As an example, an input voltage of 48V may be provided directly to the third power module 17 for use.
As shown in fig. 10, as an example, the 24V input voltage needs to be converted into the 12V second power voltage before being provided to the second power module 15 for use. As an example, an input voltage of 24V may be provided directly to the fourth power module 18 for use.
The power supply circuit provided in the embodiment of the present application may set the first conversion circuit 31 and/or the second conversion circuit 32 according to the needs of each power consumption module. The requirements of the first and second power modules 13, 15 for the power consumption voltage can be fulfilled by the first and second conversion circuits 31, 32. The first conversion circuit 31 or the second conversion circuit 32 may be omitted to save power consumption. The third power module 17 and the fourth power module 18 can be supplied with power voltage without a conversion circuit, so as to save energy consumption.
Fig. 11 shows a power supply circuit provided in an embodiment of the present application, which further includes a detection circuit 41 connected in series between the first switch circuit 12 and the first power module 13. The detection circuit 41 is configured to detect whether the first electric module 13 is a preset type of electric module, and determine whether to provide an input voltage to the first electric module 13 for use according to a detection result.
It should be noted that, in some embodiments, the input voltage cannot be directly output to the first electrical module 13 for use. Before providing the input voltage to the first electric module 13, the first electric module 13 needs to be detected to detect whether the first electric module 13 is an electric module of a preset type. When the first electric module 13 is of a preset type, it means that an input voltage can be supplied to the first electric module 13; otherwise the input voltage cannot be provided to the first electrical module 13 for use in order to avoid damaging the first electrical module 13.
As an example, in PoE (Power over Ethernet ) technology, power is typically supplied to a PD (Power Device) by a PSE (Power Sourcing Equipment ).
As an example, when the power supply circuit provided in the embodiment of the present application is applied to PoE, the PSE includes the power supply circuit described above, and the PD includes the first power module 13 described above. The PSE needs to detect the type of the first electrical module 13 by the detection circuit 41 before providing the input voltage described above to the PD.
As an example, the detection circuit 41 operates on the principle that:
(1) The detection circuit 41 outputs a detection voltage based on the input voltage before the input voltage is supplied to the first electric module 13. The detection voltage is output to the first electric module 13 in order to detect the type of the first electric module 13. Alternatively, the detection voltage is equal to 2.8-10V.
(2) When the first electric module 13 is detected as being of the first type, the detection circuit 41 outputs the above-described input voltage to the first electric module 13. As an example, in the case of outputting the detection voltage, the detection circuit 41 may detect the impedance value of the first electric module 13 to determine the type of the first electric module 13. For example, when it is detected that the impedance value of the first electric module 13 is equal to the first preset value, the type of the first electric module 13 is determined to be the first type, otherwise, it is determined that the first electric module 13 is not the first type.
(3) When it is detected that the first electrical module 13 is not of the first type, the detection circuit 41 turns off the output.
It should be noted that, the detection circuit 41 and the working principle of the detection circuit 41 are both in the prior art, and the embodiment of the present application does not specifically limit the structure of the detection circuit 41, and a technician may select the corresponding prior art to implement according to the needs.
As shown in fig. 11, the power supply circuit provided in the embodiment of the present application further includes an impedance circuit 42, a second switch control circuit 43, and a fifth switch circuit 44. The impedance value of the impedance circuit 42 is equal to the first preset value.
A first end of the impedance circuit 42 is connected to the output of the detection circuit 41, and a second end of the impedance circuit 42 is grounded. The fifth switching circuit 44 is for switching a path between the ground terminal of the first electric module 13 and the ground.
The second switch control circuit 43 is connected to the output terminal of the detection circuit 41 and the control terminal of the fifth switch circuit 44, and is configured to control the fifth switch circuit 44 to be turned on when the output voltage of the detection circuit 41 is the input voltage, thereby providing the input voltage to the first electric module 13, and to control the fifth switch circuit 44 to be turned off when the output voltage of the detection circuit 41 is the detection voltage, thereby disconnecting the ground terminal of the first electric module 13 from the ground.
The power supply circuit provided in this embodiment of the present application may "fool" the detection design of the detection circuit 41 by setting the impedance circuit 42 with the impedance value being the first preset value, so as to bypass the detection stage of the detection circuit 41, so as to rapidly supply power to the first power module 13.
As shown in fig. 12, as an example, the impedance circuit 42 includes a ninth resistor R9 and a capacitor C, and the switching function of the fifth switching circuit 44 may also be realized by an electronic switch. For example, the fifth switching circuit 44 includes a fifth switching transistor Q5. As an example, the second switch control circuit 43 includes a third zener diode DZ3, a fourth zener diode DZ4, a tenth resistor R10, and an eleventh resistor R11.
The first end of the ninth resistor R9, the first end of the capacitor C, the cathode of the third zener diode DZ3, and the output end of the detection circuit 41 are connected, and the second end of the ninth resistor R9, the second end of the capacitor C, the anode of the fourth zener diode DZ4, and the source of the fifth switching tube Q5 are grounded. The anode of the third zener diode DZ3 is connected to the first end of the tenth resistor R10, the second end of the tenth resistor R10, the cathode of the fourth zener diode DZ4 is connected to the first end of the eleventh resistor R11, and the second end of the eleventh resistor R11 is connected to the gate of the fifth switching tube Q5. As an example, the first electric module 13 is connected to the output terminal of the detection circuit 41, and the ground terminal of the first electric module 13 is connected to the drain terminal of the fifth switching transistor Q5.
As an example, the detection voltage output from the detection circuit 41 is 2.8 to 10V. The voltage stabilizing value of the third voltage stabilizing diode DZ3 is 12V, and the voltage stabilizing value of the fourth voltage stabilizing diode DZ4 is 10V. The on-voltage drop of the fifth switching transistor Q5 is denoted Vds, and the regulated voltage of the third zener diode DZ3 is denoted V0.
Therefore, when the voltage at the output terminal of the detection circuit 41 is greater than or equal to (v0+vds), the fifth switching transistor Q5 is turned on. When the voltage at the output terminal of the detection circuit 41 is smaller than (v0+vds), the fifth switching transistor Q5 is turned off.
As an example, the impedance value of the impedance circuit 42 includes the resistance value of the ninth resistor R9 and the capacitance value of the capacitor C. For example, the resistance value of the ninth resistor R9 is 24.9kΩ, and the capacitance C value of the capacitance C is 0.1 μf.
In another embodiment of the present application, there is also provided an electronic device including the voltage selection circuit provided in any one of the above embodiments, or the power supply circuit provided in any one of the above embodiments.
As one example, the electronic device is a router, switch, or the like.
As an example, when the input voltage is equal to 48V, the first switch circuit 12, the third switch circuit 113, and the fourth switch circuit 163 are turned on, and the second switch circuit 14 is turned off. For example, the first power module 13 includes a main control chip and LEDs.
As an example, when the input voltage is equal to 24V, the first switch circuit 12, the third switch circuit 113, and the fourth switch circuit 163 are turned off, and the second switch circuit 14 is turned on. For example, the second power module 15 includes an LED driving circuit.
The electronic device provided by the embodiment of the application also has the beneficial effects that different input voltages share the same input end 10, so that not only can the input voltage larger than or equal to the first threshold be provided for the first power module 13 to be used, but also the input voltage smaller than the first threshold be provided for the second power module 15 to be used, and the problem of how to provide the input voltage with the corresponding value for the corresponding power module to be used is solved, and the whole circuit is simple in structure, easy to realize and low in cost.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. A voltage selection circuit, comprising:
the first switch circuit is connected in series between the input end and the first electric module, and the input end is used for receiving input voltage;
the second switch circuit is connected in series between the input end and the second power utilization module, and the power utilization voltages required by the first power utilization module and the second power utilization module are different;
the first switch control circuit is connected with the first switch circuit, the second switch circuit and the input end, and is used for controlling the first switch circuit to be conducted and the second switch circuit to be disconnected under the condition that the input voltage is larger than or equal to a first threshold value, and is used for controlling the first switch circuit to be disconnected and the second switch circuit to be conducted under the condition that the input voltage is smaller than the first threshold value.
2. The voltage selection circuit of claim 1, wherein the first switch control circuit comprises two sub-switch control circuits, one of the sub-switch control circuits connecting the first switch circuit and the input terminal, the other of the sub-switch control circuits connecting the second switch circuit and the input terminal;
the sub-switch control circuit connected with the first switch circuit is used for controlling the first switch circuit to be turned on when the input voltage is larger than or equal to the first threshold value, and is used for controlling the first switch circuit to be turned off when the input voltage is smaller than the first threshold value;
the sub-switch control circuit connected with the second switch circuit is used for controlling the second switch circuit to be turned off when the input voltage is larger than or equal to the first threshold value, and is used for controlling the second switch circuit to be turned on when the input voltage is smaller than the first threshold value.
3. The voltage selection circuit of claim 2, wherein at least one of the two sub-switch control circuits comprises:
The first end of the first voltage dividing device is connected with the input end;
the second end of the second voltage division device is grounded;
a third switching circuit connected in series between the second end of the first voltage dividing device and the first end of the second voltage dividing device;
the voltage stabilizing circuit is connected in series between the input end and the ground and is provided with a voltage stabilizing output end which is connected with the third switch circuit;
wherein a second end of the first voltage dividing device in the sub-switch control circuit connected with the first switch circuit is connected with the first switch circuit, and/or a first end of the second voltage dividing device in the sub-switch control circuit connected with the second switch circuit is connected with the second switch circuit;
when the input voltage is greater than or equal to the first threshold, the voltage stabilizing circuit is conducted, the voltage of the voltage stabilizing output end is equal to the voltage stabilizing voltage, and the voltage stabilizing circuit is used for controlling the third switching circuit to be conducted, and the first threshold is greater than the voltage stabilizing voltage;
and under the condition that the input voltage is smaller than the first threshold value, the voltage stabilizing circuit is turned off, and the voltage of the voltage stabilizing output end is equal to the input voltage and is used for controlling the third switching circuit to be turned off.
4. The voltage selection circuit of claim 3, wherein the voltage stabilizing circuit comprises a third voltage dividing device and a voltage stabilizing diode connected in series, a first end of the third voltage dividing device is connected with the input end, a second end of the third voltage dividing device is connected with a cathode of the voltage stabilizing diode, an anode of the voltage stabilizing diode is grounded, and an cathode of the voltage stabilizing diode is the voltage stabilizing output end.
5. The voltage selection circuit of claim 3, wherein the sub-switch control circuit further comprises:
and the current limiting circuit is connected in series between the voltage stabilizing output end and the third switching circuit.
6. A power supply circuit comprising the voltage selection circuit of any one of claims 1 to 5.
7. The power supply circuit of claim 6, wherein the power supply circuit further comprises:
and the switching circuit is connected with the first power supply, the second power supply and the input end and is used for controlling the first power supply to be connected with the input end or controlling the second power supply to be connected with the input end, wherein the first power supply is used for providing an input voltage which is larger than or equal to the first threshold value, and the second power supply is used for providing an input voltage which is smaller than the first threshold value.
8. The power supply circuit of claim 6, wherein the power supply circuit further comprises:
the first conversion circuit is connected in series between the first switch circuit and the first electric module and is used for converting the input voltage into a first power utilization voltage and providing the first power utilization voltage to the first electric module; and/or the number of the groups of groups,
and the second conversion circuit is connected in series between the second switching circuit and the second power utilization module and is used for converting the input voltage into a second power utilization voltage and providing the second power utilization voltage for the second power utilization module.
9. The power supply circuit according to any one of claims 6 or 7, characterized in that the power supply circuit further comprises:
a detection circuit connected in series between the first switch circuit and the first electric module, for outputting a detection voltage based on the input voltage before outputting the input voltage to the first electric module, to detect an impedance value between an output terminal of the detection circuit and ground, and for outputting the input voltage when detecting that the impedance value between the output terminal of the detection circuit and ground is equal to a preset value, the detection voltage being smaller than the input voltage;
The impedance circuit is connected in series between the output end of the detection circuit and the ground, and the impedance value of the impedance circuit is equal to the preset value;
the fifth switch circuit is connected in series between the grounding end of the first electric module and the ground;
and the second switch control circuit is connected with the detection circuit and the fifth switch circuit and is used for controlling the fifth switch circuit to be turned on under the condition that the detection circuit outputs the input voltage and controlling the fifth switch circuit to be turned off under the condition that the detection circuit outputs the detection voltage.
10. An electronic device comprising the voltage selection circuit of any one of claims 1 to 5 or comprising the power supply circuit of any one of claims 6 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223107338.6U CN218920268U (en) | 2022-11-21 | 2022-11-21 | Voltage selection circuit, power supply circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223107338.6U CN218920268U (en) | 2022-11-21 | 2022-11-21 | Voltage selection circuit, power supply circuit and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117420900A (en) * | 2023-12-19 | 2024-01-19 | 合肥联宝信息技术有限公司 | Circuit device and electronic apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117420900A (en) * | 2023-12-19 | 2024-01-19 | 合肥联宝信息技术有限公司 | Circuit device and electronic apparatus |
| CN117420900B (en) * | 2023-12-19 | 2024-04-02 | 合肥联宝信息技术有限公司 | Circuit device and electronic apparatus |
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