CN220210421U - Switching circuit, circuit board and electronic equipment - Google Patents

Switching circuit, circuit board and electronic equipment Download PDF

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Publication number
CN220210421U
CN220210421U CN202321432325.8U CN202321432325U CN220210421U CN 220210421 U CN220210421 U CN 220210421U CN 202321432325 U CN202321432325 U CN 202321432325U CN 220210421 U CN220210421 U CN 220210421U
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voltage
module
resistor
switching circuit
switch
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CN202321432325.8U
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刘迪吉
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Guangzhou Shiyuan Electronics Thecnology Co Ltd
Guangzhou Shikun Electronic Technology Co Ltd
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Guangzhou Shiyuan Electronics Thecnology Co Ltd
Guangzhou Shikun Electronic Technology Co Ltd
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Abstract

The embodiment of the application discloses switch circuit, circuit board and electronic equipment relates to the switch circuit field, and this circuit includes: the device comprises a load module, a switch module, a voltage comparison module, a first voltage division module and a second voltage division module; the load module is electrically connected with the switch module and the voltage comparison module in sequence, and the voltage comparison module is electrically connected with the first voltage division module and the second voltage division module respectively. By adopting the switching circuit, the switching of the switching module between the off state and the on state in the switching circuit can be accurately controlled, and the cost is lower.

Description

Switching circuit, circuit board and electronic equipment
Technical Field
The present application relates to the field of switching circuits, and in particular, to a switching circuit, a circuit board, and an electronic device.
Background
The switching circuit is an important circuit with wide application, and is mainly divided into three types of digital switching circuits, analog switching circuits and mechanical switching circuits. In any switch circuit, the switch module or the component is mainly included, when the switch module is in an on state, other modules or components included in the switch circuit work, and when the switch module is in an off state, the switch circuit does not work. For example, a switch circuit is provided in the television, and when the switch circuit receives a high-level voltage signal, a switch module in the switch circuit is switched from an off state to an on state, and the television plays a picture. Therefore, how to precisely control the switching module in the switching circuit to switch between different working states is always one of the design key points of the switching circuit.
Disclosure of Invention
The embodiment of the application provides a switch circuit, a circuit board and electronic equipment, adopts the switch circuit that this application is described, can be in the switch module in the switch circuit switch between off-state and on-state of accurate control, and the cost is lower. The technical scheme is as follows:
in a first aspect, embodiments of the present application provide a switching circuit, the circuit including: the device comprises a load module, a switch module, a voltage comparison module, a first voltage division module and a second voltage division module;
the load module is electrically connected with the switch module and the voltage comparison module in sequence, and the voltage comparison module is electrically connected with the first voltage division module and the second voltage division module respectively;
the first voltage dividing module and the second voltage dividing module are used for dividing the received control voltage to obtain working voltage and sending the working voltage to the voltage comparison module;
the voltage comparison module is used for comparing the voltage value of the working voltage with a preset reference voltage value and sending a conducting signal to the switch module when the voltage value of the working voltage is larger than the reference voltage value;
the switch module is used for switching from an off state to an on state according to the on signal so as to enable the load module to work based on the switch module in the on state.
In one or more embodiments, the voltage comparison module includes: the voltage stabilizing comparison unit, the first capacitor and the first resistor;
the first end of the first resistor is connected with the load module, the second end of the first resistor is connected with the first end of the voltage stabilizing comparison unit and the first end of the first capacitor respectively, the second end of the first capacitor is connected with the first voltage dividing module and the second voltage dividing module respectively, the second end of the voltage stabilizing comparison unit is connected with the second voltage dividing module, and the third end of the voltage stabilizing comparison unit is grounded.
In one or more embodiments, the voltage regulation comparison unit includes an operational amplifier or a reference voltage regulator.
In one or more embodiments, the voltage regulation comparison unit includes a reference voltage regulator;
the negative electrode of the reference voltage stabilizer is connected with the first end of the first resistor, the positive electrode of the reference voltage stabilizer is grounded, and the reference electrode of the reference voltage stabilizer is connected with the second voltage dividing module.
In one or more embodiments, the first voltage dividing module includes a second resistor;
the first end of the second resistor is used for receiving the control voltage, and the second end of the second resistor is connected with the voltage comparison module.
In one or more embodiments, the second voltage dividing module includes: a third resistor;
the first end of the third resistor is connected with the voltage comparison module, and the second end of the third resistor is grounded.
In one or more embodiments, the second voltage dividing module further includes: a voltage stabilizing and filtering unit;
the first end of the voltage stabilizing filter unit is connected with the first end of the third resistor, and the second end of the voltage stabilizing filter unit is connected with the second end of the third resistor.
In one or more embodiments, the voltage stabilizing filter unit includes a second capacitor;
the first end of the second capacitor is connected with the first end of the third resistor, and the second end of the second capacitor is connected with the second end of the third resistor.
In one or more embodiments, the load module includes: a backlight unit and a current regulating unit;
the first end of the backlight unit is connected with the voltage comparison module, the second end of the backlight unit is connected with the first end of the current regulating unit through the switch module, and the second end of the current regulating unit is grounded.
In one or more embodiments, the current regulating unit includes a fourth resistor;
the first end of the fourth resistor is connected with the switch module, and the second end of the fourth resistor is grounded.
In a second aspect, an embodiment of the present application provides a circuit board, where the circuit board includes any one of the switching circuits according to the first aspect.
In a third aspect, an embodiment of the present application provides an electronic device, where the electronic device includes any one of the switching circuits according to the first aspect, or includes a circuit board according to the second aspect.
The technical scheme provided by some embodiments of the present application has the beneficial effects that at least includes:
in the application, a first voltage dividing module and a second voltage dividing module divide the received control voltage to obtain working voltage, a voltage comparison module compares the voltage value of the working voltage with a preset reference voltage value, and when the voltage value of the working voltage is larger than the reference voltage value, a conduction signal is sent to a switch module so that the switch module is switched to a conduction state, and a load module works; in other words, the switching circuit provided by the application can be conducted to work only when the voltage value of the control signal is larger than a preset value, and the specific magnitude of the preset value for conducting the switching circuit is flexibly set by adjusting the resistance values respectively corresponding to the first voltage dividing module and the second voltage dividing module under the condition that the preset reference voltage value is unchanged; the switch circuit provided by the application is low in cost, simple and reliable in structure and high in flexibility.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a switch circuit according to an embodiment of the present application;
fig. 2 is a schematic diagram of a second structure of a switching circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram III of a switch circuit according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a switching circuit according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of a switch circuit according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of a switch circuit according to an embodiment of the present disclosure;
fig. 7 is a schematic diagram of a switch circuit according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings of the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present application, it is to be understood that the terms "comprise" and "have," and any variations thereof, are intended to cover non-exclusive inclusions, unless otherwise specifically defined and defined. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context. Furthermore, in the description of the present application, unless otherwise indicated, "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.
The present application is described in detail with reference to specific examples.
In one embodiment, as shown in fig. 1, fig. 1 is a schematic diagram illustrating a structure of a switching circuit according to an embodiment of the present application. The switching circuit includes: a load module 101, a switch module 102, a voltage comparison module 103, a first voltage division module 104 and a second voltage division module 105. The load module 101 is electrically connected with the switch module 102 and the voltage comparison module 103 in sequence, and the voltage comparison module 103 is electrically connected with the first voltage division module 104 and the second voltage division module 105 respectively.
The load module 101 is configured to receive an operating current provided by an internal power supply or an external power supply for operation when the switch module is in a conductive state. For example, the load module 101 is a backlight circuit including LED lamps, and when the switch module is in a conductive state, the switch circuit forms a loop, and the load module 106 receives an operating current and drives the LED lamps to emit light based on the operating current. It is to be understood that the above is merely an example, and that the present application also includes other types of load modules.
The switch modules 102 are mainly classified into three types of digital switch modules, analog switch modules, and mechanical switch modules. The digital switch module is mainly composed of transistors or MOS transistors, and for example, when the load module 101 includes a motor or an LED lamp or a relay, the switch module 102 includes a digital switch. The analog switch module includes a MOS transistor, avoiding the use of a transistor to generate a large amount of interference with the analog signal, for example, when the load 101 includes a high frequency antenna or sensor or an audio-video component, the switch module 102 includes an analog switch. The mechanical switch module comprises a single-pole or double-pole switch or a relay switch and the like. It is to be understood that the above is only an example, and that other types of switch modules are also included in the present application.
A first voltage dividing module 104 and a second voltage dividing module 105 for dividing the received control voltage V on The working voltage V is obtained after the voltage division treatment ref And sends the operating voltage to the voltage comparison module 103. The first voltage dividing module 104 corresponds to the first resistance value R 1 The second voltage dividing module 105 corresponds to a second resistance value R 2 And the first voltage dividing module 104 and the second voltage dividing module 105 are connected in series to obtain V ref ＝R 2 /(R 1 +R 2 )×V on 。
A voltage comparison module 103 for comparing the working voltage V ref Voltage value of (2) and preset reference voltage value V 0 Performing contrast processing at the working voltage V ref The voltage value of (2) is greater than the reference voltage value V 0 A turn-on signal is sent to the switch module 102. The switch module 102 is switched from the off state to the on state according to the on signal, so that the load module 101 operates based on the switch module 102 in the on state. The on signal may be a high level voltage signal or various pulse width modulated (Pulse width modulation, PWM) signals, which is not limited in this application.
Due to the operating characteristics of the voltage comparison module 103, the voltage value of the voltage comparison module 103 is constant, i.e. the reference voltage value V 0 . Only when the operating voltage V of the comparison end of the voltage comparison module 103 ref Greater than the reference voltage value V 0 The voltage comparison module 103 sends a turn-on signal to the switch module 102, so that the switch module 102 is switched to a turn-on state according to the turn-on signal.
In the application, a first voltage dividing module and a second voltage dividing module divide the received control voltage to obtain working voltage, a voltage comparison module compares the voltage value of the working voltage with a preset reference voltage value, and when the voltage value of the working voltage is larger than the reference voltage value, a conduction signal is sent to a switch module so that the switch module is switched to a conduction state, and a load module works; in other words, the switching circuit provided by the application can be conducted to work only when the voltage value of the control signal is larger than a preset value, and the specific magnitude of the preset value for conducting the switching circuit is flexibly set by adjusting the resistance values respectively corresponding to the first voltage dividing module and the second voltage dividing module under the condition that the preset reference voltage value is unchanged; the switch circuit provided by the application is low in cost, simple and reliable in structure and high in flexibility.
In an embodiment, as shown in fig. 2, fig. 2 is a schematic diagram of a second structure of a switching circuit according to an embodiment of the present application. The switching circuit includes: a load module 201, a switch module 202, a voltage comparison module 203, a first voltage division module 204, and a second voltage division module 205. The load module 201 is electrically connected to the switch module 202 and the voltage comparing module 203 in sequence, and the voltage comparing module 203 is electrically connected to the first voltage dividing module 204 and the second voltage dividing module 205 respectively.
The load module 201, the switch module 202, the first voltage dividing module 204, and the second voltage dividing module 205 are shown in fig. 1, and will not be described herein.
In this embodiment, the voltage comparison module 203 includes: the voltage stabilizing comparison unit 2031, the first capacitor C1 and the first resistor R1. The first end of the first resistor R1 is connected to the load module 201, the second end of the first resistor R1 is connected to the first end of the voltage stabilizing comparison unit 2031 and the first end of the first capacitor C1, the second end of the first capacitor C1 is connected to the first voltage dividing module 204 and the second voltage dividing module 205, the second end of the voltage stabilizing comparison unit 2031 is connected to the second voltage dividing module 205, and the third end of the voltage stabilizing comparison unit 2031 is grounded.
The voltage-stabilizing comparing unit 2031 includes an operational amplifier or a reference voltage stabilizer. For example, the voltage stabilizing comparing unit 2031 is an operational amplifier, and compares the operating voltage V ref Whether or not it is greater than the reference voltage value V 0 When the working voltage V ref The voltage value of (2) is greater than the reference voltage valueV 0 A turn-on signal is sent to the switch module 202.
As another example, as shown in fig. 3, fig. 2 is a schematic diagram three of a switching circuit according to an embodiment of the present application, where the voltage stabilizing comparing unit 2031 includes a reference voltage stabilizer U1. The negative electrode of the reference voltage regulator U1 is connected to the first end of the first resistor R1, the positive electrode of the reference voltage regulator U1 is grounded, and the reference electrode of the reference voltage regulator U1 is connected to the second voltage dividing module 205. The first resistor R1 is used for charging the reference voltage regulator U1, and the first capacitor C1 is a loop feedback capacitor.
The reference voltage stabilizer U1 is a controllable precise voltage stabilizing source, and the reference voltage value of the first reference voltage stabilizer U1 can be set from V 01 To V 02 Any value within the range. For example, the first reference voltage regulator U1 is TL431 or TL432, V 01 Is 2.5V, V 02 36V.
For example, a reference voltage value V corresponding to the reference voltage regulator U1 is set 0 At 2.5V, when the operating voltage V is divided by the first voltage dividing module 204 and the second voltage dividing module 205 ref Greater than the reference voltage value V 0 At this time, a turn-on signal is sent to the switching module 202 through the negative electrode of the reference voltage regulator U1. The switch module 202 is switched from the off state to the on state according to the on signal, so that the load module 201 operates based on the switch module 202 in the on state.
In the embodiment, the universal resistor, the capacitor and the reference voltage stabilizer are adopted, so that the cost is low, the power consumption of the power supply is extremely low, the switch module is in an off state when no on signal is received, the switch circuit basically does not consume power consumption, the efficiency of the power supply and the standby power consumption are not influenced, and the energy-saving and environment-friendly effects are realized.
In the application, a first voltage dividing module and a second voltage dividing module divide the received control voltage to obtain working voltage, a voltage comparison module compares the voltage value of the working voltage with a preset reference voltage value, and when the voltage value of the working voltage is larger than the reference voltage value, a conduction signal is sent to a switch module so that the switch module is switched to a conduction state, and a load module works; in other words, the switching circuit provided by the application can be conducted to work only when the voltage value of the control signal is larger than a preset value, and the specific magnitude of the preset value for conducting the switching circuit is flexibly set by adjusting the resistance values respectively corresponding to the first voltage dividing module and the second voltage dividing module under the condition that the preset reference voltage value is unchanged; the switch circuit provided by the application is low in cost, simple and reliable in structure and high in flexibility.
In one embodiment, as shown in fig. 4, fig. 4 is a schematic structural diagram of a switching circuit according to an embodiment of the present application. The switching circuit includes: a load module 301, a switch module 302, a voltage comparison module 303, a first voltage division module 304 and a second voltage division module 305. The load module 301 is electrically connected to the switch module 302 and the voltage comparing module 203 in sequence, and the voltage comparing module 303 is electrically connected to the first voltage dividing module 304 and the second voltage dividing module 305 respectively.
The load module 301, the switch module 302, and the voltage comparison module 303 are shown in fig. 2, and are not described herein.
In this embodiment, the first voltage dividing module 304 includes a second resistor R2. A first end of the second resistor R2 is used for receiving the control voltage V on A second terminal of the second resistor R2 is connected to the voltage comparison module 303.
The second division module 305 includes: and a third resistor R3. The first end of the third resistor R3 is connected to the voltage comparing module 303, and the second end of the third resistor R3 is grounded.
In this embodiment, the second voltage dividing module 305 further includes: the voltage stabilizing filter unit 3051. The first end of the voltage stabilizing filter unit 3051 is connected to the first end of the third resistor R3, and the second end of the voltage stabilizing filter unit 3051 is connected to the second end of the third resistor R3. For example, the voltage stabilizing filter unit 3051 includes a second capacitor C2. The first end of the second capacitor C2 is connected to the first end of the third resistor R3, and the second end of the second capacitor C2 is connected to the second end of the third resistor R3. In this embodiment, by providing the voltage stabilizing filter unit in the second voltage dividing module, voltage stabilizing filtering can be effectively performed on the second voltage dividing module, and misoperation on the second voltage dividing module can be prevented.
In this embodiment, the first voltage dividing module and the second voltage dividing module respectively comprise a second resistor and a third resistor,the second resistor R2 corresponds to the first resistor R 1 The third resistor R3 corresponds to the second resistance value R 2 And the second resistor R2 and the third resistor R3 are connected in series to obtain V ref ＝R 2 /(R 1 +R 2 )×V on . The control signal V required by the switch module to be switched into the conducting state is adjusted by adjusting the resistance values of the second resistor R2 and the third resistor R3 on Voltage value of (2).
In the application, a first voltage dividing module and a second voltage dividing module divide the received control voltage to obtain working voltage, a voltage comparison module compares the voltage value of the working voltage with a preset reference voltage value, and when the voltage value of the working voltage is larger than the reference voltage value, a conduction signal is sent to a switch module so that the switch module is switched to a conduction state, and a load module works; in other words, the switching circuit provided by the application can be conducted to work only when the voltage value of the control signal is larger than a preset value, and the specific magnitude of the preset value for conducting the switching circuit is flexibly set by adjusting the resistance values respectively corresponding to the first voltage dividing module and the second voltage dividing module under the condition that the preset reference voltage value is unchanged; the switch circuit provided by the application is low in cost, simple and reliable in structure and high in flexibility.
In one embodiment, as shown in fig. 5, fig. 5 is a schematic diagram of a switch circuit according to an embodiment of the present application. The switching circuit includes: a load module 401, a switch module 402, a voltage comparison module 403, a first voltage division module 404, and a second voltage division module 405. The load module 401 is electrically connected with the switch module 402 and the voltage comparison module 403 in sequence, and the voltage comparison module 403 is electrically connected with the first voltage division module 404 and the second voltage division module 405 respectively.
The load module 401 and the switch module 402 are shown in fig. 1, and will not be described here again.
In this embodiment, the voltage comparison module 403 includes: the reference voltage regulator U1, the first capacitor C1 and the first resistor R1, the first voltage dividing module 404 includes the second resistor R2, and the second voltage dividing module 405 includes the third resistor R3 and the second capacitor C2.
The first end of the first resistor R1 is connected with the load module 401, the second end of the first resistor R1 is connected with the negative electrode of the reference voltage stabilizer U1 and the first end of the first capacitor C1 respectively, the second end of the first capacitor C1 is connected with the first end of the second resistor R2 and the first end of the third resistor R3 respectively, the reference electrode of the reference voltage stabilizer U1 is connected with the second end of the third resistor R3, the positive electrode of the reference voltage stabilizer U1 is grounded, the first end of the second capacitor C2 is connected with the first end of the third resistor R3, and the second end of the second capacitor C2 is connected with the second end of the third resistor R3.
In the embodiment, the universal resistor, the capacitor and the reference voltage stabilizer are adopted, so that the cost is low, the power consumption of the power supply is extremely low, the switch module is in an off state when no on signal is received, the switch circuit basically does not consume power consumption, the efficiency of the power supply and the standby power consumption are not influenced, and the energy-saving and environment-friendly effects are realized.
In the application, a first voltage dividing module and a second voltage dividing module divide the received control voltage to obtain working voltage, a voltage comparison module compares the voltage value of the working voltage with a preset reference voltage value, and when the voltage value of the working voltage is larger than the reference voltage value, a conduction signal is sent to a switch module so that the switch module is switched to a conduction state, and a load module works; in other words, the switching circuit provided by the application can be conducted to work only when the voltage value of the control signal is larger than a preset value, and the specific magnitude of the preset value for conducting the switching circuit is flexibly set by adjusting the resistance values respectively corresponding to the first voltage dividing module and the second voltage dividing module under the condition that the preset reference voltage value is unchanged; the switch circuit provided by the application is low in cost, simple and reliable in structure and high in flexibility.
In one embodiment, as shown in fig. 6, fig. 6 is a schematic structural diagram of a switching circuit according to an embodiment of the present application. The switching circuit includes: a load module 501, a switch module 502, a voltage comparison module 503, a first voltage division module 504, and a second voltage division module 505. The load module 501 is electrically connected to the switch module 502 and the voltage comparing module 503 in sequence, and the voltage comparing module 503 is electrically connected to the first voltage dividing module 504 and the second voltage dividing module 505 respectively.
The switch module 502, the voltage comparison module 503, the first voltage division module 504 and the second voltage division module 505 are shown in fig. 1, and will not be described herein.
In the present embodiment, the load module 501 includes a backlight unit 5011 and a current adjusting unit. The first end of the backlight unit 5011 is connected to the voltage comparing module 503, the second end of the backlight unit 5011 is connected to the first end of the current adjusting unit through the switching module 502, and the second end of the current adjusting unit is grounded.
For example, the current regulating unit includes a fourth resistor R4. The first end of the fourth resistor R4 is connected to the switch module 502, and the second end of the fourth resistor R4 is grounded.
In this embodiment, when the switch module 502 receives the on signal from the voltage comparing module 503, it switches from the off state to the on state. Further, after the switch circuit is turned on, the resistance value of the fourth resistor R4 is adjusted to change the current value of the working current of the backlight unit 5011, thereby changing the brightness of the backlight unit 5011 and meeting the user requirements.
In the application, a first voltage dividing module and a second voltage dividing module divide the received control voltage to obtain working voltage, a voltage comparison module compares the voltage value of the working voltage with a preset reference voltage value, and when the voltage value of the working voltage is larger than the reference voltage value, a conduction signal is sent to a switch module so that the switch module is switched to a conduction state, and a load module works; in other words, the switching circuit provided by the application can be conducted to work only when the voltage value of the control signal is larger than a preset value, and the specific magnitude of the preset value for conducting the switching circuit is flexibly set by adjusting the resistance values respectively corresponding to the first voltage dividing module and the second voltage dividing module under the condition that the preset reference voltage value is unchanged; the switch circuit provided by the application is low in cost, simple and reliable in structure and high in flexibility.
In one embodiment, as shown in fig. 7, fig. 7 is a schematic diagram of a switch circuit according to an embodiment of the present application. The switching circuit includes: a load module 601, a switch module 602, a voltage comparison module 603, a first voltage division module 604 and a second voltage division module 605.
The load module 601 includes a backlight unit 5011 and a fourth resistor R4. The voltage comparison module 403 includes a reference voltage regulator U1, a first capacitor C1, and a first resistor R1, the first voltage division module 404 includes a second resistor R2, and the second voltage division module 405 includes a third resistor R3 and a second capacitor C2.
The first end of the first resistor R1 is connected to the backlight unit 6011, the backlight unit 6011 is connected to the first end of the fourth resistor R4 through the switch module 502, the second end of the fourth resistor R4 is grounded, the second end of the first resistor R1 is connected to the negative electrode of the reference voltage regulator U1 and the first end of the first capacitor C1, the second end of the first capacitor C1 is connected to the first end of the second resistor R2 and the first end of the third resistor R3, the reference electrode of the reference voltage regulator U1 is connected to the second end of the third resistor R3, the positive electrode of the reference voltage regulator U1 is grounded, the first end of the second capacitor C2 is connected to the first end of the third resistor R3, and the second end of the second capacitor C2 is connected to the second end of the third resistor R3.
The second resistor R2 and the third resistor R3 are used for receiving the control voltage V on The working voltage V is obtained after the voltage division treatment ref . The first resistor R1 charges the reference voltage regulator U1, and the first capacitor C1 is a loop feedback capacitor. Reference voltage regulator U1 will operate at voltage V ref Voltage value of (2) and preset reference voltage value V 0 Performing contrast processing at the working voltage V ref The voltage value of (2) is greater than the reference voltage value V 0 A turn-on signal is sent to the switch module 502. The switching module 502 is switched from an off state to an on state according to an on signal, so that the backlight unit 6011 operates based on the switching module 502 in the on state. After the switch circuit is turned on, the current value of the operating current of the backlight unit 5011 is changed by adjusting the resistance value of the fourth resistor R4, thereby changing the brightness of the backlight unit 5011 and meeting the user demand.
In the application, a first voltage dividing module and a second voltage dividing module divide the received control voltage to obtain working voltage, a voltage comparison module compares the voltage value of the working voltage with a preset reference voltage value, and when the voltage value of the working voltage is larger than the reference voltage value, a conduction signal is sent to a switch module so that the switch module is switched to a conduction state, and a load module works; in other words, the switching circuit provided by the application can be conducted to work only when the voltage value of the control signal is larger than a preset value, and the specific magnitude of the preset value for conducting the switching circuit is flexibly set by adjusting the resistance values respectively corresponding to the first voltage dividing module and the second voltage dividing module under the condition that the preset reference voltage value is unchanged; the switch circuit provided by the application is low in cost, simple and reliable in structure and high in flexibility.
In one embodiment, the present embodiment further provides a circuit board, including a switch circuit as described in any one of the above embodiments. The circuit board can realize all functions and effects of the switch circuit in any embodiment. The circuit board, also called a board card, is a printed circuit board (Printed Circuit Board, PCB) with a ferrule during manufacture, which can be inserted into a slot of a main circuit board of a computer to control the operation of hardware devices, such as a display. On the board card, the parts are connected by printed conductors. It can be understood that the circuit board in the present application may be a board card, or may be formed by splicing a plurality of board cards, which is not limited in this application.
In an embodiment, the present embodiment further provides an electronic device, including a switch circuit as described in any one of the above embodiments, or including the above circuit board. The electronic device can realize all functions and effects of the switch circuit in any of the above embodiments. For example, the electronic device may be any device such as a computer, a cell phone, a tablet, a personal digital assistant (Personal DigitalAssistant, PDA for short), or an interactive tablet. The interactive tablet is integrated with any one or more of functions of a projector, an electronic whiteboard, a curtain, a sound, a television, a video conference terminal and the like, and the interactive tablet is not limited in this application.

Claims (12)

1. A switching circuit, the circuit comprising: the device comprises a load module, a switch module, a voltage comparison module, a first voltage division module and a second voltage division module;
the load module is electrically connected with the switch module and the voltage comparison module in sequence, and the voltage comparison module is electrically connected with the first voltage division module and the second voltage division module respectively;
the first voltage dividing module and the second voltage dividing module are used for dividing the received control voltage to obtain working voltage and sending the working voltage to the voltage comparison module;
the voltage comparison module is used for comparing the voltage value of the working voltage with a preset reference voltage value and sending a conducting signal to the switch module when the voltage value of the working voltage is larger than the reference voltage value;
the switch module is used for switching from an off state to an on state according to the on signal so as to enable the load module to work based on the switch module in the on state.
2. The switching circuit of claim 1, wherein the voltage comparison module comprises: the voltage stabilizing comparison unit, the first capacitor and the first resistor;
the first end of the first resistor is connected with the load module, the second end of the first resistor is connected with the first end of the voltage stabilizing comparison unit and the first end of the first capacitor respectively, the second end of the first capacitor is connected with the first voltage dividing module and the second voltage dividing module respectively, the second end of the voltage stabilizing comparison unit is connected with the second voltage dividing module, and the third end of the voltage stabilizing comparison unit is grounded.
3. The switching circuit according to claim 2, wherein the voltage-stabilizing comparison unit includes an operational amplifier or a reference voltage stabilizer.
4. The switching circuit according to claim 3, wherein the voltage-stabilizing comparison unit includes a reference voltage stabilizer;
the negative electrode of the reference voltage stabilizer is connected with the first end of the first resistor, the positive electrode of the reference voltage stabilizer is grounded, and the reference electrode of the reference voltage stabilizer is connected with the second voltage dividing module.
5. The switching circuit of claim 1, wherein the first voltage divider module comprises a second resistor;
the first end of the second resistor is used for receiving the control voltage, and the second end of the second resistor is connected with the voltage comparison module.
6. The switching circuit of claim 1, wherein the second voltage dividing module comprises: a third resistor;
the first end of the third resistor is connected with the voltage comparison module, and the second end of the third resistor is grounded.
7. The switching circuit of claim 6 wherein the second voltage divider module further comprises: a voltage stabilizing and filtering unit;
the first end of the voltage stabilizing filter unit is connected with the first end of the third resistor, and the second end of the voltage stabilizing filter unit is connected with the second end of the third resistor.
8. The switching circuit according to claim 7, wherein the voltage stabilizing filter unit includes a second capacitor;
the first end of the second capacitor is connected with the first end of the third resistor, and the second end of the second capacitor is connected with the second end of the third resistor.
9. The switching circuit of claim 1, wherein the load module comprises: a backlight unit and a current regulating unit;
the first end of the backlight unit is connected with the voltage comparison module, the second end of the backlight unit is connected with the first end of the current regulating unit through the switch module, and the second end of the current regulating unit is grounded.
10. The switching circuit of claim 9, wherein the current regulating unit comprises a fourth resistor;
the first end of the fourth resistor is connected with the switch module, and the second end of the fourth resistor is grounded.
11. A circuit board, characterized in that it comprises a switching circuit according to any one of claims 1 to 10.
12. An electronic device comprising a switching circuit according to any one of claims 1 to 10 or comprising a circuit board according to claim 11.
CN202321432325.8U 2023-06-06 2023-06-06 Switching circuit, circuit board and electronic equipment Active CN220210421U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202321432325.8U CN220210421U (en) 2023-06-06 2023-06-06 Switching circuit, circuit board and electronic equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202321432325.8U CN220210421U (en) 2023-06-06 2023-06-06 Switching circuit, circuit board and electronic equipment

Publications (1)

Publication Number Publication Date
CN220210421U true CN220210421U (en) 2023-12-19

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202321432325.8U Active CN220210421U (en) 2023-06-06 2023-06-06 Switching circuit, circuit board and electronic equipment

Country Status (1)

Country Link
CN (1) CN220210421U (en)

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