CN219369952U - Detection circuit and power supply - Google Patents

Detection circuit and power supply Download PDF

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CN219369952U
CN219369952U CN202223168548.6U CN202223168548U CN219369952U CN 219369952 U CN219369952 U CN 219369952U CN 202223168548 U CN202223168548 U CN 202223168548U CN 219369952 U CN219369952 U CN 219369952U
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resistor
voltage
diode
detection
detection module
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梁明健
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Enping Aomei Audio Co ltd
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Enping Aomei Audio Co ltd
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Abstract

The utility model discloses a detection circuit and a power supply, which comprises an optical coupler, a first detection module, a second detection module and an input module, wherein the first detection module and the second detection module are connected with the output module through the optical coupler, the first detection module is used for detecting positive voltage of the power supply, the voltage on a first resistor is different according to different voltages, a PNP triode is conducted when the voltage on the first resistor reaches a preset value, the optical coupler is conducted to enable the output module to be conducted, the second detection module is used for detecting negative voltage of the power supply, the voltage on a third resistor is different according to different voltages, and when the voltage on the third resistor reaches a preset value, the NPN triode is conducted, and the optical coupler enables the output module to be conducted.

Description

Detection circuit and power supply
Technical Field
The present utility model relates to the field of voltage detection, and in particular, to a detection circuit and a power supply.
Background
At present, a group of power supplies are mainly adopted for the power supply detection circuit to correspond to one indicating lamp, the corresponding indicating lamp is turned off when the power supply of which group is not supplied, more components and parts are needed by the method, a plurality of indicating lamps are needed to be installed on the panel, the occupied space is large, the cost is increased, and the positive and negative voltage range of the power supply which can be detected is small.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a detection circuit which can detect the positive and negative voltages of a wider power supply.
The utility model also provides a power supply with the detection circuit.
The detection circuit according to the embodiment of the first aspect of the utility model comprises an optical coupler, wherein the optical coupler comprises a light receiving end and a light emitting end; the first detection module comprises a PNP triode, a first voltage-stabilizing diode, a first detection end, a first resistor and a second resistor, wherein the first resistor and the second resistor are connected in series to form a first branch, the negative end of the first voltage-stabilizing diode is connected with the first detection end, the positive end of the first voltage-stabilizing diode is connected with the collector of the PNP triode, the emitter of the PNP triode is connected with the light-emitting end, the first branch is respectively connected with the negative end of the first voltage-stabilizing diode and the light-emitting end, and the base of the PNP triode is connected with the first branch; the second detection module comprises an NPN triode, a second voltage-stabilizing diode, a second detection end, a third resistor and a fourth resistor, wherein the third resistor and the fourth resistor are connected in series to form a second branch, the positive end of the second voltage-stabilizing diode is connected with the second detection end, the negative end of the second voltage-stabilizing diode is connected with the emitter of the NPN triode, the collector of the NPN triode is connected with the light-emitting end, the second branch is respectively connected with the positive end and the light-emitting end of the second voltage-stabilizing diode, and the base of the NPN triode is connected with the second branch; the output module is connected with the light receiving end; the first detection module and the second detection module are connected with the output module through the optical coupler.
The detection circuit provided by the embodiment of the utility model has at least the following beneficial effects: the first branch is connected with the base electrode of the PNP triode, when the voltage of the first detection end reaches a preset voltage value, the PNP triode is conducted, the purpose of detecting the voltage is achieved, and when the PNP triode is conducted, current flows through the light emitting end of the optical coupler, the light emitting end emits light signals, and the output module is conducted; the second branch is connected with the base electrode of the NPN triode, when the voltage of the second detection end reaches a preset voltage value, the NPN triode is conducted, the purpose of detecting the voltage is achieved, after the NPN triode is conducted, current flows through the light emitting end of the optical coupler, the light emitting end emits light signals, the output module is conducted, and whether the detected voltage reaches the preset voltage value can be known by observing whether the output module is conducted or not.
According to some embodiments of the utility model, the first detection module further comprises a first diode, the light emitting end is connected with the positive electrode end of the first diode, the negative electrode end of the first diode is grounded, and the first branch is respectively connected with the negative electrode end of the first zener diode and the negative electrode end of the first diode.
According to some embodiments of the utility model, the second detection module includes a second diode, the light emitting end is connected to a negative electrode end of the second diode, an anode end of the second diode is grounded, and the second branch is connected to the anode end of the second zener diode and the anode end of the second diode, respectively.
According to some embodiments of the utility model, the first detection module further includes a fifth resistor, one end of the fifth resistor is connected to the collector of the PNP triode, and the other end of the fifth resistor is connected to the light emitting end.
According to some embodiments of the utility model, the second detection module further includes a sixth resistor, one end of the sixth resistor is connected to the collector of the NPN triode, and the other end of the sixth resistor is connected to the light emitting end.
According to some embodiments of the utility model, the zener voltage of the first zener diode is the same as the zener voltage of the second zener diode.
According to some embodiments of the utility model, the first resistor has the same resistance as the fourth resistor, and the second resistor has the same resistance as the third resistor.
According to some embodiments of the utility model, the resistance of the first resistor is in a first proportional relationship with the resistance of the second resistor.
According to some embodiments of the utility model, the resistance of the third resistor and the resistance of the fourth resistor have a second proportional relationship.
A power supply according to an embodiment of the second aspect of the utility model comprises a detection circuit according to any of the embodiments described above.
The power supply provided by the embodiment of the utility model has at least the following beneficial effects: the power supply adopts a detection circuit, wherein the detection circuit is connected with the base electrode of the PNP triode through a first branch, when the voltage of a first detection end reaches a preset voltage value, the PNP triode is conducted, the purpose of detecting the voltage is achieved, and when the PNP triode is conducted, current flows through the light emitting end of the optical coupler, and the light emitting end emits light signals, so that the output module is conducted; the second branch is connected with the base electrode of the NPN triode, when the voltage of the second detection end reaches a preset voltage value, the NPN triode is conducted, the purpose of detecting the voltage is achieved, after the NPN triode is conducted, current flows through the light emitting end of the optical coupler, the light emitting end emits light signals, the output module is conducted, and whether the detected voltage reaches the preset voltage value can be known by observing whether the output module is conducted or not.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The utility model is further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a block diagram of a detection circuit according to an embodiment of the present utility model;
fig. 2 is a circuit diagram of a detection circuit according to an embodiment of the present utility model.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
Referring to fig. 1 and 2, the detection circuit includes a first detection module 100, a second detection module 200, and an output module 300, and the first detection module 100 and the second detection module 200 are connected to the output module 300 through an optical coupler OC. The optical coupler OC comprises a light receiving end and a light emitting end, the first detection module comprises a PNP triode Q1, a first zener diode D1, a first detection end, a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected with the first detection end, the other end of the first resistor R1 is connected with one end of the second resistor R2, the other end of the second resistor R2 is grounded, the negative end of the first zener diode D1 is connected with the first detection end, the positive end of the first zener diode D1 is connected with the collector of the PNP triode Q1, the emitter of the PNP triode Q1 is connected with the light emitting end of the optical coupler OC, and the base of the PNP triode Q1 is connected between the first resistor R1 and the second resistor R2. The second detection module 200 includes an NPN triode Q2, a second zener diode D2, a second detection end, a third resistor R3, and a fourth resistor R4, where one end of the fourth resistor R4 is connected to the second detection end, the other end of the fourth resistor R4 is connected to the third resistor R3, the other end of the third resistor R3 is grounded, the positive end of the second zener diode D2 is connected to the second detection end, the negative end of the second zener diode D2 is connected to the emitter of the NPN triode Q2, the collector of the NPN triode Q2 is connected to the light emitting end of the optical coupler OC, and the base of the NPN triode Q2 is connected between the third resistor R3 and the fourth resistor R4.
It can be understood that the first detection module 100 is configured to detect a positive voltage, an input voltage enters the first detection module through the first input terminal, when the input voltage passes through the first zener diode D1, if the input voltage exceeds a breakdown voltage of the first zener diode D1, the first zener diode D1 breaks down to provide a current to an emitter of the PNP transistor Q1, the first resistor R1 and the second resistor R2 are serially connected to divide the voltage, when the voltage across the first resistor R1 exceeds a predetermined voltage, the PNP transistor Q1 is turned on, the current passes through a light emitting terminal of the PNP transistor Q1 and flows through a light receiving terminal of the optocoupler OC, and after receiving an optical signal from the light emitting terminal, the output module is turned on.
It can be understood that the second detection module 200 is configured to detect a negative voltage, the input voltage enters the second detection module through the second input terminal, when the input voltage passes through the second zener diode D2, if the input voltage exceeds the breakdown voltage of the second zener diode D2, the second zener diode D2 will be broken down, the third resistor R3 and the fourth resistor R4 are serially connected to divide the voltage, when the voltage on the fourth resistor R4 exceeds the preset voltage, the NPN transistor Q2 is turned on, the current flows through the light emitting terminal of the optocoupler OC, and the light receiving terminal of the optocoupler OC receives the light signal from the light emitting terminal, and then the output module is turned on.
It will be appreciated that in other embodiments, the first detection module 100 may detect a positive 47 volts and the second detection module 200 may detect a negative 47 volts.
It will be appreciated that the positive and negative voltages of the power supply may be detected by the first detection module 100 and the second detection module 200.
It is understood that the zener voltage of the first zener diode D1 is the same as the zener voltage of the second zener diode D2.
It should be noted that, in another embodiment, the zener voltage of the first zener diode D1 is 6.8v compared to the zener voltage of the second zener diode D2.
It can be understood that the first resistor R1 and the second resistor R2 have a proportional relationship, and the first detection module 100 can detect different voltages by adjusting the proportional relationship between the first resistor R1 and the second resistor R2.
It can be understood that the third resistor R3 and the fourth resistor R4 have a proportional relationship, and the second detection module 200 can detect different voltages by adjusting the proportional relationship between the third resistor R3 and the fourth resistor R4.
It is understood that the resistance of the first resistor R1 is the same as the resistance of the third resistor R3, and the resistance of the second resistor R2 is the same as the resistance of the fourth resistor R4.
In another embodiment, the resistance of the first resistor R1 and the resistance of the fourth resistor R4 are 6800 ohms, and the resistance of the second resistor R2 and the third resistor R3 are 36000 ohms.
It is understood that the first detection module 100 further includes a first diode D3, where the positive terminal of the first diode D3 is connected to the light emitting terminal of the optocoupler OC, and the negative terminal of the first diode D3 is grounded, and the current flow direction is limited by the first diode D3.
It can be appreciated that the second detection module 200 further includes a second diode D4, the positive electrode of the second diode D4 is grounded, the negative electrode of the second diode D4 is connected to the light receiving end of the optocoupler OC, and the current flow direction is limited by the second diode D4.
It can be understood that the first detection module 100 further includes a fifth resistor R5, one end of the fifth resistor R5 is connected to the collector of the PNP triode Q1, the other end of the fifth resistor R5 is connected to the light emitting end of the optocoupler OC, and the negative end of the second diode D4 is connected between the fifth resistor R5 and the light emitting end of the optocoupler OC.
It can be understood that the second detection module 200 further includes a sixth resistor R6, one end of the sixth resistor R6 is connected to the collector of the NPN triode Q2, the other end of the sixth resistor R6 is connected to the light emitting end of the optocoupler OC, and the positive terminal of the first diode D3 is connected between the sixth resistor R6 and the light emitting end of the optocoupler OC.
It can be appreciated that the output module 300 further includes a seventh resistor R7, an LED indicator, and a 12 v power supply, where one end of the seventh resistor R7 is connected to the 12 v power supply, the other end of the seventh resistor R7 is connected to the LED indicator, the LED indicator is connected to the light receiving end of the optocoupler OC, and when the light receiving end of the optocoupler OC receives an optical signal from the light receiving end of the optocoupler OC, the circuit is turned on, and the LED indicator is turned on.
It will be appreciated by those skilled in the art that the specific values of the above circuit components may be determined according to actual requirements and are not limited herein.
The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.

Claims (10)

1. A detection circuit, comprising:
the optical coupler comprises a light receiving end and a light emitting end;
the first detection module comprises a PNP triode, a first voltage-stabilizing diode, a first detection end, a first resistor and a second resistor, wherein the first resistor and the second resistor are connected in series to form a first branch, the negative end of the first voltage-stabilizing diode is connected with the first detection end, the positive end of the first voltage-stabilizing diode is connected with the collector of the PNP triode, the emitter of the PNP triode is connected with the light-emitting end, the first branch is respectively connected with the negative end of the first voltage-stabilizing diode and the light-emitting end, and the base of the PNP triode is connected with the first branch;
the second detection module comprises an NPN triode, a second voltage-stabilizing diode, a second detection end, a third resistor and a fourth resistor, wherein the third resistor and the fourth resistor are connected in series to form a second branch, the positive end of the second voltage-stabilizing diode is connected with the second detection end, the negative end of the second voltage-stabilizing diode is connected with the emitter of the NPN triode, the collector of the NPN triode is connected with the light-emitting end, the second branch is respectively connected with the positive end and the light-emitting end of the second voltage-stabilizing diode, and the base of the NPN triode is connected with the second branch;
the output module is connected with the light receiving end;
the first detection module and the second detection module are connected with the output module through the optical coupler.
2. The detection circuit of claim 1, wherein the first detection module further comprises a first diode, the light emitting end is connected to the positive end of the first diode, the negative end of the first diode is grounded, and the first branch is connected to the negative end of the first zener diode and the negative end of the first diode, respectively.
3. The detection circuit of claim 1, wherein the second detection module further comprises a second diode, the light emitting end is connected to a negative electrode end of the second diode, a positive electrode of the second diode is grounded, and the second branch is connected to the positive electrode end of the second zener diode and the positive electrode end of the second diode, respectively.
4. The detection circuit of claim 1, wherein the first detection module further comprises a fifth resistor, one end of the fifth resistor is connected to the collector of the PNP transistor, and the other end of the fifth resistor is connected to the light emitting end.
5. The detection circuit according to claim 1, wherein the second detection module further comprises a sixth resistor, one end of the sixth resistor is connected to the collector of the NPN triode, and the other end of the sixth resistor is connected to the light emitting end.
6. The detection circuit of claim 1, wherein the zener voltage of the first zener diode is the same as the zener voltage of the second zener diode.
7. The detection circuit of claim 1, wherein the first resistor has a resistance equal to a resistance of the fourth resistor, and the second resistor has a resistance equal to a resistance of the third resistor.
8. The detection circuit of claim 1, wherein a first proportional relationship exists between the resistance of the first resistor and the resistance of the second resistor.
9. The detection circuit of claim 1, wherein the resistance of the third resistor is in a second proportional relationship with the resistance of the fourth resistor.
10. A power supply comprising a detection circuit as claimed in any one of claims 1 to 9.
CN202223168548.6U 2022-11-28 2022-11-28 Detection circuit and power supply Active CN219369952U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202223168548.6U CN219369952U (en) 2022-11-28 2022-11-28 Detection circuit and power supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202223168548.6U CN219369952U (en) 2022-11-28 2022-11-28 Detection circuit and power supply

Publications (1)

Publication Number Publication Date
CN219369952U true CN219369952U (en) 2023-07-18

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202223168548.6U Active CN219369952U (en) 2022-11-28 2022-11-28 Detection circuit and power supply

Country Status (1)

Country Link
CN (1) CN219369952U (en)

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