CN216531274U - Electronic switch circuit and electronic equipment - Google Patents
Electronic switch circuit and electronic equipment Download PDFInfo
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- CN216531274U CN216531274U CN202122617084.1U CN202122617084U CN216531274U CN 216531274 U CN216531274 U CN 216531274U CN 202122617084 U CN202122617084 U CN 202122617084U CN 216531274 U CN216531274 U CN 216531274U
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- switching circuit
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Abstract
The utility model discloses an electronic switch circuit and electronic equipment.A first switch tube is arranged between a control pin and a first electric element, and a second switch tube is arranged between the control pin and a second electric element, so that the first switch tube is conducted and the first electric element is switched on under the condition that the control pin outputs low level by fully utilizing the characteristics of the switch tubes; under the condition that the control pin outputs a high level, the second switch tube is conducted, and the second circuit element is disconnected; and under the condition that the control pin is in a high-resistance state, the first switch tube and the second switch tube are both turned off, and the first electric element and the second electric element are both broken. Therefore, the on-off of the two power consumption elements can be simultaneously controlled by one control pin, the number of the control pins is effectively reduced under the condition that the power consumption elements are more, the size of a control module of the electronic equipment is remarkably reduced, and the hardware cost and the PCB wiring difficulty of the control module are further reduced.
Description
Technical Field
The utility model relates to the technical field of power electronics, in particular to an electronic switch circuit and electronic equipment.
Background
The indicator lamps are widely applied to power electronic products, but in the existing general design, each indicator lamp is mainly used to control the on and off of the indicator lamp by using one pin of a controller. Therefore, when the number of hard disks that the controller needs to support is large, the number of control pins required is correspondingly increased. The requirement of a large number of pins is that a controller with a larger size is selected or an IO expansion chip and the like are used as solutions, so that the hardware cost of the controller is increased, and the PCB wiring difficulty of a main control board in the controller is increased.
Disclosure of Invention
The embodiment of the utility model aims to provide an electronic switch circuit and electronic equipment.
According to a first aspect of the present invention, there is provided an electronic switching circuit comprising: the first switch tube is connected between the control pin and the first electric element, and the grid electrode of the first switch tube is connected with the voltage bias point of the bias branch circuit; one end of the first electric element is connected with the first switching tube, and the other end of the first electric element is connected with a power supply end; the second switch tube is connected between the control pin and the second electric element, and the grid electrode of the second switch tube is connected with the source electrode of the first switch tube and the control pin; one end of the second dual-purpose electric element is connected with the second switch tube, and the other end of the second dual-purpose electric element is connected with a power supply end.
According to an embodiment of the present invention, when the control pin outputs a low level, the first switch tube is turned on, and the first electric element is turned on; under the condition that the control pin outputs a high level, the second switch tube is conducted, and the second circuit element is disconnected; and under the condition that the control pin is in a high-resistance state, the first switch tube and the second switch tube are both turned off, and the first electric element and the second electric element are both broken.
According to an embodiment of the present invention, the bias sub-circuit includes: a first bias resistor and a second bias resistor connected in series; one end of the first bias resistor is connected with a power supply end, and the other end of the first bias resistor is connected with the second bias resistor; one end of the second bias resistor is connected with the first bias resistor, and the other end of the second bias resistor is grounded; a connection point between the first bias resistor and the second bias resistor forms the voltage bias point.
According to an embodiment of the present invention, a resistance ratio of the first bias resistor to the second bias resistor is 1: 3.
According to an embodiment of the utility model, the electronic switching circuit further comprises: a first current limiting branch comprising: one end of the first current-limiting resistor is connected with a power supply end, and the other end of the first current-limiting resistor is connected with the first electric element; a second current limiting branch comprising: and one end of the second current-limiting resistor is connected with a power supply end, and the other end of the second current-limiting resistor is connected with the second electrical element.
According to an embodiment of the present invention, the first switch transistor is an NMOS field effect transistor; and/or the second switch tube is an NMOS field effect tube.
According to an embodiment of the present invention, the turn-on voltage of the NMOS fet is 1.9V.
According to an embodiment of the present invention, the voltage of the power supply terminal is 3.3V.
According to an embodiment of the present invention, the first electrical component is a first indicator light; and/or the second electrical component is a second indicator light.
According to the second aspect of the present invention, there is also provided an electronic apparatus including the above electronic switching circuit.
According to the electronic switch circuit and the electronic equipment, the first switch tube is arranged between the control pin and the first electric element, the second switch tube is arranged between the control pin and the second electric element, the characteristics of the switch tubes are fully utilized, the first switch tube is conducted under the condition that the control pin outputs low level, and the first electric element is conducted; under the condition that the control pin outputs a high level, the second switch tube is conducted, and the second circuit element is disconnected; and under the condition that the control pin is in a high-resistance state, the first switch tube and the second switch tube are both turned off, and the first electric element and the second electric element are both broken. Therefore, the on-off of the two power consumption elements can be simultaneously controlled by one control pin, the number of the control pins is effectively reduced under the condition that the power consumption elements are more, the size of a control module of the electronic equipment is remarkably reduced, and the hardware cost and the PCB wiring difficulty of the control module are further reduced.
It is to be understood that the teachings of the present invention need not achieve all of the above-described benefits, but rather that specific embodiments may achieve specific technical results, and that other embodiments of the present invention may achieve benefits not mentioned above.
Drawings
The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the utility model are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:
in the drawings, the same or corresponding reference numerals indicate the same or corresponding parts.
FIG. 1 shows a schematic diagram of an electronic switching circuit according to an embodiment of the utility model;
FIG. 2 is a schematic diagram showing the output of an electronic switching circuit in a low level state according to an embodiment of the present invention;
FIG. 3 is a schematic diagram showing a state where an output of an electronic switching circuit according to an embodiment of the present invention is at a high level;
fig. 4 shows a schematic diagram of the electronic switching circuit according to the embodiment of the present invention in a state where the output impedance is high.
Detailed Description
The principles and spirit of the present invention will be described with reference to a number of exemplary embodiments. It is understood that these embodiments are given only to enable those skilled in the art to better understand and to implement the present invention, and do not limit the scope of the present invention in any way. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.
The technical solution of the present invention is further elaborated below with reference to the drawings and the specific embodiments.
Fig. 1 shows a schematic diagram of an electronic switching circuit according to an embodiment of the utility model.
Referring to fig. 1, the electronic switching circuit of the present invention includes at least a first switching transistor Q1 and a second switching transistor Q2. A first switch tube Q1 connected between the control pin CTRL and the first electric element D1, and a gate G of the first switch tube Q1Q1Is connected to the voltage bias point PD of the bias subcircuit P. The first electric element D1 has one end connected to the first switching tube Q1 and the other end connected to the power supply terminal U. A second switch tube Q2 connected between the control pin CTRL and the second electrical element D2, and a gate G of the second switch tube Q2Q2And the source S of the first switch tube Q1Q1Connected to and connected to the control pin CTRL. One end of the second electric element D2 and the drain D of the second switch tube Q2Q2And the other end of the power supply is connected with a power supply end U. Wherein, the drain D of the first switch tube Q1Q1A source S of a first switch tube Q1 connected to the first electric element D1Q1Connected to the control pin CTRL.
In an embodiment of the present invention, when the control pin CTRL outputs a low level, the first switching tube Q1 is turned on, and the first electrical element D1 is turned on. When the control pin CTRL outputs a high level, the second switching tube Q2 is turned on, and the second electrical element D2 is turned off. When the control pin CTRL is in a high-impedance state, the first switching tube Q1 and the second switching tube Q2 are both turned off, and the first electrical element D1 and the second electrical element D2 are both turned off.
In one embodiment of the present invention, the first switch Q1 is an NMOS fet, and the second switch Q2 is an NMOS fet.
In one embodiment of the present invention, the first electric element D1 is a first indicator light, and the second electric element D2 is a second indicator light.
It should be noted that the other elements in fig. 1 are included in the preferred embodiment of the present invention, and are only exemplary and not intended to limit the scope of the present invention.
In one embodiment of the present invention, the bias subcircuit P includes a first bias resistor R1 and a second bias resistor R2 connected in series. The first bias resistor R1 has one end connected to the power supply terminal U and the other end connected to the second bias resistor R2. One end of the second bias resistor R2 is connected to the first bias resistor R1, and the other end is grounded. A connection point between the first bias resistor R1 and the second bias resistor R2 forms a voltage bias point PD.
In one embodiment of the present invention, the ratio of the resistance of the first bias resistor R1 to the resistance of the second bias resistor R2 is 1: 3.
In an embodiment of the present invention, the electronic switching circuit further includes a first current limiting branch X1 and a second current limiting branch X2. The first current-limiting branch X1 includes a first current-limiting resistor R3, one end of the first current-limiting resistor R3 is connected to the power supply terminal U, and the other end is connected to the first electrical component D1. The second current-limiting branch X2 includes a second current-limiting resistor R4, one end of the second current-limiting resistor R4 is connected to the power supply terminal U, and the other end is connected to the second electrical component D2.
In one embodiment of the present invention, the on-voltage of the NMOS fet is 1.9V.
In one embodiment of the present invention, the voltage of the power supply terminal U is 3.3V.
For example, the status indicator lights with three colors used in the hard disk of the back panel of the server are taken as the electric elements. The three-color indicator light comprises green, yellow and blue, wherein the yellow indicator light can be replaced by a red indicator light. The green indicator light needs to operate independently and therefore a separate control pin is necessary. The yellow indicator light and the blue indicator light do not need to be simultaneously lighted, and only the following three scenes can appear: (1) blue light and yellow light; (2) yellow bright and blue off; (3) yellow and blue are both extinguished. The pin-out of the controller of a typical server has three states: high, low, high resistance, for example: the controller is a programmable logic device CPLD. Therefore, in the solution of the utility model, the turning on and off of the blue and yellow indicator lamps is controlled by one control pin of the CPLD.
It should be noted that, the detailed description of the scheme is given by taking the control of the electronic switch circuit to turn on and off the two indicating lamps as an example, and is only an exemplary illustration of the present invention, and in the practical application process, the electric element may also be other applicable electric elements, for example: fans, motors, etc.
The following describes a specific implementation of the electronic switch circuit according to the embodiment of the present invention with reference to fig. 2 to 4.
In the following fig. 2-4, an NMOS fet with a threshold voltage Vth of 1.9V, i.e., V, is selectedTH1＝VTH21.9V. When V isGS1>VTH1When Q1 is turned on, current flows from the drain to the source of Q1, and the corresponding first indicator light D1 lights up. When V isGS2>VTH2When Q2 is turned on, current flows from the drain to the source of Q2, and the corresponding second indicator light D2 lights up. The first bias resistor R1 of the bias circuit P is a resistor with a resistance of 10k Ω, and the second bias resistor R1 is a resistor with a resistance of 30k Ω. The voltage of the power supply terminal U is 3.3V, shown as 3V 3. The first current limiting resistor R3 of the first current limiting branch X1 and the second current limiting resistor R4 of the second current limiting branch X2 both use resistors with a resistance of 160 Ω, which is shown as 160R. The first electric element D1 is a blue indicator light, and the second electric element D2 is a yellow indicator light.
Fig. 2 shows a schematic diagram of the electronic switching circuit according to the embodiment of the present invention in a state where the output is low.
Referring to FIG. 2, the output of the control pin CTRL is low, source S of Q1Q1Voltage of 0V, grid GQ1The voltage is 2.475V, VGS1>VTH1Q1 is on, and D1 is on. V of Q2GS2The voltage is 0V, so Q2 is in the off state and D2 is off.
Fig. 3 shows a schematic diagram of the electronic switching circuit according to the embodiment of the present invention in a state where the output is high.
Referring to FIG. 3, the output of the control pin CTRL is high, as is the voltage at the power supply, here a 3.3V power supply, shown at 3V 3. Source S of Q1Q1Voltage of 3.3V, grid GQ1The voltage was 2.475V. Thus, VGS1＜VTH1Q1 is turned off, and D1 is extinguished. Of Q2VGS2The voltage is 3.3V, so Q2 is on and D2 lights up.
Fig. 4 shows a schematic diagram of the electronic switching circuit according to the embodiment of the present invention in a state where the output impedance is high.
Referring to fig. 4, CTRL is off at control pin, i.e., in a high-impedance state. At this time, Q1 and Q2 can be considered to coincide at point d, i.e., Q1 is cascaded with Q2. The required turn-on voltage is increased to 2 Vth. At this time, the gate of Q1 and the source of Q2 are both 2.475V, so both Q1 and Q2 cannot be turned on, and both indicator lights are turned off.
It should be noted that when two fets are cascaded, the total turn-on voltage required to make both fets non-conductive is not 2 × Vth. In practice, when the voltage at point a is 3.3V, Q1 is turned on, and D1 is lit. To ensure that the two field effect transistors are not conducted, 1.5 times of Vth is used as the starting voltage of the first switch tube Q1 and the second switch tube Q2 to be more reliable, and 1.5 times of Vth is 2.85V. Therefore, the voltage at point a can be determined to be 2.475V, Vth < Va < 1.5 Vth.
Therefore, when the control pin CTRL is in the off state, Q1 and Q2 both operate in the non-saturation region, i.e., there is a voltage drop between the gate and the source, but no current or a current less than 10uA, which is insufficient for Q1 and Q2.
In practical application, the detected voltage values at points a, b, c, d, e and f of the electronic switch circuit in fig. 4 are as follows:
Va＝2.485V；
Vb＝1.854V；
Vc＝3.313V；
Vd＝1.112V；
Ve＝1.854V；
Vf＝3.314V。
thus, the actual V is obtained through detectionGS1＝Vb-Vd＝0.642V＜VTH1，VGS2＝Ve-0V＝Ve＝1.854V＜VTH2. Q1 and Q2 are both in the off state, and the first indicator light and the second indicator light are both off.
In the electronic switching circuit and the electronic device in the embodiments of the present invention, the first switching tube Q1 is disposed between the control pin CTRL and the first electrical element D1, and the second switching tube Q2 is disposed between the control pin CTRL and the second electrical element D2, so that the characteristics of the switching tubes are fully utilized, and when the control pin CTRL outputs a low level, the first switching tube Q1 is turned on, and the first electrical element D1 is turned on. When the control pin CTRL outputs a high level, the second switching tube Q2 is turned on, and the second electrical element D2 is turned off. When the control pin CTRL is in a high-impedance state, the first switching tube Q1 and the second switching tube Q2 are both turned off, and the first electrical element D1 and the second electrical element D2 are both turned off. Therefore, the on-off of the two power consumption elements can be controlled simultaneously by using one control pin CTRL, the quantity of the control pins CTRL is effectively reduced under the condition that the power consumption elements are more, the size of a control module of the electronic equipment is obviously reduced, and the hardware cost and the wiring difficulty of a control module PCB are further reduced.
Based on the electronic switch circuit, the utility model also provides electronic equipment which comprises the electronic switch circuit.
It is to be noted here that: the specific implementation of the electronic device is similar to the description of the electronic switch circuit embodiment shown in fig. 1 to 4, and has similar beneficial effects to the electronic switch circuit embodiment shown in fig. 1 to 4, and therefore, the detailed description thereof is omitted. For technical details that are not disclosed in the embodiment of the electronic device of the present invention, please refer to the description of the electronic switch circuit shown in fig. 1 to 4 of the present invention for understanding, and therefore, for brevity, will not be described again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of a unit is only one logical function division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units. Either in one location or distributed over multiple network elements. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all the functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit. The integrated unit may be implemented in the form of hardware, or in the form of hardware plus a software functional unit.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An electronic switching circuit, the electronic switching circuit comprising:
the first switch tube is connected between the control pin and the first electric element, and the grid electrode of the first switch tube is connected with the voltage bias point of the bias branch circuit; one end of the first electric element is connected with the first switching tube, and the other end of the first electric element is connected with a power supply end;
the second switch tube is connected between the control pin and the second electric element, and the grid electrode of the second switch tube is connected with the source electrode of the first switch tube and the control pin; one end of the second dual-purpose electric element is connected with the second switch tube, and the other end of the second dual-purpose electric element is connected with a power supply end.
2. The electronic switching circuit of claim 1,
when the control pin outputs a low level, the first switch tube is conducted, and the first electric element is conducted;
under the condition that the control pin outputs a high level, the second switch tube is conducted, and the second circuit element is disconnected;
and under the condition that the control pin is in a high-resistance state, the first switch tube and the second switch tube are both turned off, and the first electric element and the second electric element are both broken.
3. The electronic switching circuit of claim 1, the bias subcircuit comprising: a first bias resistor and a second bias resistor connected in series;
one end of the first bias resistor is connected with a power supply end, and the other end of the first bias resistor is connected with the second bias resistor;
one end of the second bias resistor is connected with the first bias resistor, and the other end of the second bias resistor is grounded;
a connection point between the first bias resistor and the second bias resistor forms the voltage bias point.
4. The electronic switching circuit of claim 3, a resistance value ratio of the first bias resistor to the second bias resistor is 1: 3.
5. The electronic switching circuit of claim 1, further comprising:
a first current limiting branch comprising: one end of the first current-limiting resistor is connected with a power supply end, and the other end of the first current-limiting resistor is connected with the first electric element;
a second current limiting branch comprising: and one end of the second current-limiting resistor is connected with a power supply end, and the other end of the second current-limiting resistor is connected with the second electrical element.
6. The electronic switching circuit of claim 1,
the first switch tube is an NMOS field effect tube; and/or
The second switch tube is an NMOS field effect tube.
7. The electronic switching circuit of claim 6,
and the conduction voltage of the NMOS field effect transistor is 1.9V.
8. The electronic switching circuit according to any of claims 1-7,
the voltage of the power supply end is 3.3V.
9. The electronic switching circuit according to any of claims 1-7,
the first electric element is a first indicator light; and/or
The second electrical component is a second indicator light.
10. An electronic device comprising the electronic switching circuit of any of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122617084.1U CN216531274U (en) | 2021-10-28 | 2021-10-28 | Electronic switch circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122617084.1U CN216531274U (en) | 2021-10-28 | 2021-10-28 | Electronic switch circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216531274U true CN216531274U (en) | 2022-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122617084.1U Active CN216531274U (en) | 2021-10-28 | 2021-10-28 | Electronic switch circuit and electronic equipment |
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| Country | Link |
|---|---|
| CN (1) | CN216531274U (en) |
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2021
- 2021-10-28 CN CN202122617084.1U patent/CN216531274U/en active Active
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