CN210775699U - Load access detection circuit - Google Patents
Load access detection circuit Download PDFInfo
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- CN210775699U CN210775699U CN201921433701.9U CN201921433701U CN210775699U CN 210775699 U CN210775699 U CN 210775699U CN 201921433701 U CN201921433701 U CN 201921433701U CN 210775699 U CN210775699 U CN 210775699U
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- photoelectric coupler
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- detection circuit
- access detection
- load
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Abstract
The utility model discloses a load inserts detection circuitry, include: a protection diode for protecting the photoelectric coupler from reverse breakdown after being connected to the rear end of the circuit; a current-limiting resistor having a first end connected to the first contact of the relay, the first contact being connected to the live line of the AC input, and a second end connected to a photoelectric coupler, the photoelectric coupler being connected to the protection diode; the photoelectric coupler comprises a light emitting diode and a photoelectric triode and is used for being connected with a second contact of the relay, meanwhile, the second contact is also connected with a first electrode of a power output socket, and a second electrode of the power output socket is connected with a zero line of alternating current input; a pull-up resistor having a first end connected to a power supply of a back-end detection circuit and a second end connected to the photoelectric coupler; the load access detection circuit is simple in structure and low in cost, can detect load access, and can also achieve electrical isolation.
Description
Technical Field
The utility model belongs to the technical field of power electronics, concretely relates to load access detection circuit.
Background
Load is also called load or load. The physical meaning refers to a device for converting electric energy into energy in other forms, and is a general name of all electric appliances. Such as light bulbs, motors, furnaces, etc., are all called loads that convert electrical energy into light energy, mechanical energy, thermal energy, etc., respectively. On the other hand, for the power system and the electrical equipment, the load bearing capacity of the power system and the electrical equipment has a certain limit, and the power system and the electrical equipment are generally marked on the nameplate of the power system and the electrical equipment, and overload is called when the load bearing capacity exceeds the limit.
The existing detection method of the load during access is mostly mechanical structure or complex circuit composition, the practicability and the cost are too high, electrical isolation cannot be carried out, and potential safety hazards are easy to generate.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art, the utility model aims at providing a simple structure, low cost both can detect the load and insert, can play electrical isolation's load again and insert detection circuitry.
The utility model provides a technical scheme that its technical problem adopted is:
a load access detection circuit for detecting a load of a power outlet using an ac input, comprising:
a protection diode for protecting the photoelectric coupler from reverse breakdown after being connected to the rear end of the circuit;
a relay having a first contact and a second contact;
a current-limiting resistor having a first end connected to the first contact of the relay, the first contact being connected to the live line of the AC input, and a second end connected to a photoelectric coupler, the photoelectric coupler being connected to the protection diode;
the photoelectric coupler comprises a light emitting diode and a photoelectric triode and is used for being connected with a second contact of the relay, meanwhile, the second contact is also connected with a first electrode of a power output socket, and a second electrode of the power output socket is connected with a zero line of alternating current input;
a pull-up resistor having a first terminal connected to a power source and a second terminal connected to the photocoupler.
Preferably, the second end of the current-limiting resistor is connected to the anode of a light-emitting diode in the photocoupler, the anode of the light-emitting diode is also connected to the cathode of the protection diode, the protection diode is connected to the photocoupler in a reverse parallel connection manner, the second contact of the relay is connected to the anode of the protection diode, and the protection diode is connected to the photocoupler in a reverse parallel connection manner.
Preferably, the second end of the current-limiting resistor is connected to the anode of a protection diode, the cathode of the protection diode is connected to the anode of a light-emitting diode in the photocoupler, and the protection diode is connected to the photocoupler in series.
Furthermore, the cathode of a light emitting diode in the photoelectric coupler is connected with the second contact of the relay, and the protective diode is connected into the photoelectric coupler in series.
Preferably, the protection diodes are four and are butted in pairs to form a bridge rectifier circuit.
Furthermore, the first end of the alternating current input of the bridge rectifier circuit is connected to the second end of the current limiting resistor, the second end of the alternating current input of the bridge rectifier circuit is connected to the second contact of the relay, and the alternating current input of the bridge rectifier circuit and a load plugged on a power output socket form a current loop.
Furthermore, the output positive pole of the bridge rectifier circuit is connected with the anode of the light emitting diode in the photoelectric coupler, the output negative pole is connected with the cathode of the light emitting diode in the photoelectric coupler, and the output positive pole and the load inserted on the power output socket form a current loop.
Preferably, the power supply is a power supply of the rear-end detection circuit, and signal transmission can be realized after the power supply is switched on, so that the load of the circuit is detected.
Further, the second end of the pull-up resistor is connected with the collector of a phototriode in the photoelectric coupler
The utility model has the advantages that:
the photoelectric coupler is used as a core element of the circuit, converts a current signal into an optical signal and then converts the optical signal into a voltage signal so as to detect the load condition of the circuit, limits the current in the circuit through a current-limiting resistor while detecting the load access, avoids the elements in the circuit from being burnt out due to overlarge current, protects the photoelectric switch from being broken down by high voltage during the negative half cycle of alternating current by the protection diode, and ensures that the collector of the photoelectric triode is in a certain state when the pull-up resistor is not conducted by the photoelectric coupler.
Drawings
Fig. 1 is a schematic diagram of a parallel circuit of a load access detection circuit according to the present invention;
fig. 2 is a schematic diagram of a serial circuit of a load access detection circuit according to the present invention;
fig. 3 is a schematic circuit diagram of a full-bridge rectifier type load access detection circuit of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.
Example 1
As shown in FIG. 1, the parallel load access detection circuit comprises a current limiting resistor R1, a protection diode D1, a photocoupler OP1 and a pull-up resistor R2.
One end of a current limiting resistor R1 is connected with a contact of a relay K1, and a live wire L of an alternating current input is also connected with the contact; the other end of the current-limiting resistor R1 is connected with the anode of an internal light-emitting diode of the photoelectric coupler OP1, and the cathode of the protection diode D1 is also connected with the point; the cathode of an internal light-emitting diode of the photoelectric coupler OP1 is connected with the other contact of the relay K1, the anode of the protective diode D1 is also connected with the point, and the point is also connected with one electrode of the power output socket J1; the other electrode of the power output socket J1 is connected with a zero line N of an alternating current input; one end of the pull-up resistor R2 is connected with a power supply VCC of the rear end signal receiving circuit, the other end is connected with the collector of the phototriode in the photoelectric coupler OP1, and a required detection signal is generated at the point; the emitter of the phototriode in the photoelectric coupler OP1 is connected with the reference ground of the rear end signal receiving circuit.
When the contact of the relay K1 is not closed and the power output socket J1 is not connected with any load, the circuit does not form a loop at the moment, the circuit does not work, the phototriode in the photoelectric coupler OP1 is not conducted, and due to the action of the pull-up resistor R2, the collector of the phototriode is at a high level at the moment and belongs to a no-signal state; when the power output socket J1 is connected to a load and the ac input is positive half cycle, the current sequentially passes through the current-limiting resistor R1 from the live wire L, the light-emitting diode inside the photoelectric coupler OP1, the load and the zero line N to form a loop, at this time, the photoelectric triode inside the photoelectric coupler OP1 is turned on, the collector is at low level, and the signal state is achieved; when the alternating current input is negative half cycle, the protection diode D1 plays a role of clamping, and the light emitting diode inside the photoelectric coupler OP1 is protected from reverse breakdown. In the circuit, because of the existence of the current limiting resistor R1, the current is very weak, and the load does not work normally.
Example 2
As shown in fig. 2, a series load access detection circuit is composed of a current limiting resistor R1, a protection diode D1, a photocoupler OP1 and a pull-up resistor R2.
The protection diode D1 is connected in series in the current loop to form a half-wave rectification circuit, the anode is connected with the other end of the current-limiting resistor R1, and the cathode is connected with the anode of the light-emitting diode in the photoelectric coupler OP 1; when a load is connected, and alternating current input is positive half cycle, current sequentially passes through a current-limiting resistor R1, a protection diode D1, a light-emitting diode in the photoelectric coupler OP1, the load and a zero line N to form a loop, at the moment, a photoelectric triode in the photoelectric coupler OP1 is conducted, a collector is at a low level, and the current collector belongs to a signal state; when the alternating current input is negative half cycle, the protection diode D1 is cut off in reverse direction, and the light emitting diode inside the photoelectric coupler OP1 is protected from reverse breakdown.
Example 3
As shown in fig. 3, a full-bridge rectifier type load access detection circuit, which uses ac input to detect the load of a power outlet socket J1, is composed of a current-limiting resistor R1, a bridge rectifier circuit BR1, a photo coupler OP1, and a pull-up resistor R2.
The bridge rectifier circuit BR1 consists of four protection diodes which are butted in pairs; a relay K1, having a first contact connected to the live wire L of the AC input and a second contact connected to the first electrode of the power VCC output socket J1, and the second electrode of the power VCC output socket J1 is connected to the zero wire N of the AC input, and the second contact is also connected to the bridge rectifier circuit BR 1; a current limiting resistor R1 having a first terminal connected to the first contact of the relay K1 and a second terminal connected to the bridge rectifier circuit BR 1; a photoelectric coupler OP1, which comprises a light emitting diode and a photoelectric triode, and the output end and the input end of the photoelectric coupler are connected with a bridge rectifier circuit BR 1; a pull-up resistor R2 having a first terminal connected to a power source VCC and a second terminal connected to the photocoupler OP 1.
The first end of the alternating current input of the bridge rectifier circuit BR1 is connected to the second end of the current limiting resistor R1, the second end of the alternating current input is connected to the second contact of the relay K1, and forms a current loop with a load inserted into a power VCC output socket J1, the output anode of the bridge rectifier circuit BR1 is connected to the anode of the light emitting diode, the output cathode of the bridge rectifier circuit BR1 is connected to the cathode of the light emitting diode, and forms a current loop with the load inserted into a power VCC output socket J1.
The bridge rectifier circuit BR1 is connected into the detection circuit to form a full bridge rectifier circuit; when a load is connected and the alternating current input is positive half cycle, the current sequentially passes through a current-limiting resistor R1, a bridge rectifier circuit BR1, a light-emitting diode in the photoelectric coupler OP1, a load and a zero line to form a loop, at the moment, a photoelectric triode in the photoelectric coupler OP1 is conducted, the collector is at low level and belongs to a signal state; when the alternating current input is negative half cycle, the current forms a loop from the zero line, the load, the light emitting diode in the photoelectric coupler OP1, the bridge rectifier circuit BR1, the current limiting resistor R1 and the live wire in sequence, at the moment, the photoelectric triode in the photoelectric coupler OP1 is conducted, the collector is at low level, and the signal state is achieved.
The utility model has the advantages that:
the photoelectric coupler is used as a core element of the circuit, converts a current signal into an optical signal and then converts the optical signal into a voltage signal so as to detect the load condition of the circuit, limits the current in the circuit through a current-limiting resistor while detecting the load access, avoids the elements in the circuit from being burnt out due to overlarge current, protects the photoelectric switch from being broken down by high voltage during the negative half cycle of alternating current by the protection diode, and ensures that the collector of the photoelectric triode is in a certain state when the pull-up resistor is not conducted by the photoelectric coupler.
The above embodiments of the present invention are not right the utility model discloses the limited protection scope, the utility model discloses an embodiment is not limited to this, all kinds of basis according to the above-mentioned of the utility model discloses an under the above-mentioned basic technical thought prerequisite of the utility model, right according to ordinary technical knowledge and the conventional means in this field the modification, replacement or the change of other multiple forms that above-mentioned structure made all should fall within the protection scope of the utility model.
Claims (9)
1. A load access detection circuit for detecting a load on an electrical outlet using an ac input, comprising:
a protection diode for connecting to a protection photoelectric coupler at the rear end of the circuit;
a relay having a first contact and a second contact;
a current-limiting resistor having a first end connected to the first contact of the relay, the first contact being connected to the live line of the AC input, and a second end connected to a photoelectric coupler, the photoelectric coupler being connected to the protection diode;
the photoelectric coupler comprises a light emitting diode and a photoelectric triode and is used for being connected with a second contact of the relay, meanwhile, the second contact is also connected with a first electrode of a power output socket, and a second electrode of the power output socket is connected with a zero line of alternating current input;
a pull-up resistor having a first terminal connected to a power source and a second terminal connected to the photocoupler.
2. A load access detection circuit according to claim 1, wherein: the second end of the current-limiting resistor is connected with the anode of a light-emitting diode in the photoelectric coupler, the anode of the light-emitting diode is also connected with the cathode of the protection diode, and the second contact of the relay is connected with the anode of the protection diode.
3. A load access detection circuit according to claim 1, wherein: the second end of the current-limiting resistor is connected with the anode of a protection diode, and the cathode of the protection diode is connected with the anode of a light-emitting diode in the photoelectric coupler.
4. A load access detection circuit according to claim 2 or 3, wherein: and the cathode of a light emitting diode in the photoelectric coupler is connected with the second contact of the relay.
5. A load access detection circuit according to claim 1, wherein: the four protection diodes are in butt joint with each other in pairs to form a bridge rectifier circuit.
6. The load access detection circuit of claim 5, wherein: and the first end of the alternating current input of the bridge rectifier circuit is connected to the second end of the current limiting resistor, and the second end of the alternating current input of the bridge rectifier circuit is connected to the second contact of the relay.
7. The load access detection circuit of claim 5, wherein: the output positive pole of the bridge rectifier circuit is connected with the anode of the light emitting diode in the photoelectric coupler, and the output negative pole is connected with the cathode of the light emitting diode in the photoelectric coupler.
8. A load access detection circuit according to any one of claims 2, 3 and 5, wherein: the power supply is a power supply of the rear-end detection circuit.
9. A load access detection circuit according to claim 8, wherein: and the second end of the pull-up resistor is connected with the collector of a phototriode in the photoelectric coupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921433701.9U CN210775699U (en) | 2019-08-30 | 2019-08-30 | Load access detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921433701.9U CN210775699U (en) | 2019-08-30 | 2019-08-30 | Load access detection circuit |
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| Publication Number | Publication Date |
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| CN210775699U true CN210775699U (en) | 2020-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921433701.9U Active CN210775699U (en) | 2019-08-30 | 2019-08-30 | Load access detection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110514932A (en) * | 2019-08-30 | 2019-11-29 | 广州市帝能云科技有限公司 | A kind of load detection circuit for access |
-
2019
- 2019-08-30 CN CN201921433701.9U patent/CN210775699U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110514932A (en) * | 2019-08-30 | 2019-11-29 | 广州市帝能云科技有限公司 | A kind of load detection circuit for access |
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Address after: Room A601, 271 Hongming Road, Huangpu District, Guangzhou, Guangdong 510000 Patentee after: Guangzhou dianeng cloud Technology Co.,Ltd. Address before: No. 03, No. 271, Hongming Road, East District, Guangzhou Economic and Technological Development Zone, Guangdong 510000 Patentee before: Guangzhou emperor can cloud Technology Co.,Ltd. |
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