CN219164221U - Electronic load protection circuit - Google Patents
Electronic load protection circuit Download PDFInfo
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- CN219164221U CN219164221U CN202320106998.8U CN202320106998U CN219164221U CN 219164221 U CN219164221 U CN 219164221U CN 202320106998 U CN202320106998 U CN 202320106998U CN 219164221 U CN219164221 U CN 219164221U
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- 238000001514 detection method Methods 0.000 claims abstract description 26
- 230000002159 abnormal effect Effects 0.000 claims abstract description 11
- 230000005856 abnormality Effects 0.000 claims description 16
- 230000007935 neutral effect Effects 0.000 claims description 2
- 230000000087 stabilizing effect Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005070 sampling Methods 0.000 description 4
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Abstract
The utility model discloses an electronic load protection circuit, which relates to the field of power supply, and comprises: the commercial power supply module is used for supplying alternating current and outputting the alternating current to the step-down rectifying and filtering module and the load working module; the step-down rectifying and filtering module is used for converting alternating current into direct current and outputting the direct current to the overvoltage detection module; the overvoltage detection module is used for providing stable voltage supply power-off control module and abnormal alarm module; when the direct current output by the step-down rectifying and filtering module exceeds a threshold value, a trigger signal is provided for the power-off control module; compared with the prior art, the utility model has the beneficial effects that: the voltage stabilizing diode D1 is used as a part of detection equipment for detecting that the direct current output by the voltage reduction rectifying and filtering module exceeds a threshold value, and meanwhile, the stable voltage on the voltage stabilizing diode D1 is used as working voltage of the power-off control module and the abnormal alarm module, and compared with a traditional voltage protection circuit, the voltage protection circuit has fewer devices.
Description
Technical Field
The utility model relates to the field of power supply, in particular to an electronic load protection circuit.
Background
The electronic load is a load composed of electronic components such as an integrated circuit, a transistor, and a valve, and the electronic load is a device that functions by applying electronic technology (including software), and includes: computers, air conditioners, refrigerators, washing machines, microwave ovens, printers, etc.
The existing electronic load is often provided with a voltage protection circuit, samples voltage and detects the voltage, so that the load is prevented from being damaged by high voltage, the existing technology is generally divided into a power supply circuit and a detection circuit, more components are occupied, and improvement is needed.
Disclosure of Invention
The present utility model is directed to an electronic load protection circuit, which solves the above-mentioned problems.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
an electronic load protection circuit comprising:
the commercial power supply module is used for supplying alternating current and outputting the alternating current to the step-down rectifying and filtering module and the load working module;
the step-down rectifying and filtering module is used for converting alternating current into direct current and outputting the direct current to the overvoltage detection module;
the overvoltage detection module is used for providing stable voltage supply power-off control module and abnormal alarm module; when the direct current output by the step-down rectifying and filtering module exceeds a threshold value, a trigger signal is provided for the power-off control module;
the power-off control module is used for disconnecting the loops of the load working module and the mains supply module when receiving the control signal;
the abnormality alarm module is used for alarming and prompting when the overvoltage detection module is abnormal;
the load working module is used for powering the electronic load;
the commercial power supply module is connected with the step-down rectifying and filtering module and the load working module, the step-down rectifying and filtering module is connected with the overvoltage detection module, the overvoltage detection module is connected with the power-off control module and the abnormality alarm module, and the power-off control module is connected with the load working module.
As still further aspects of the utility model: the overvoltage detection module comprises a resistor R1, a diode D1, a resistor R2, a resistor R3 and an amplifier U1, wherein one end of the resistor R1 is connected with the buck rectifying and filtering module and one end of the resistor R2, the other end of the resistor R1 is connected with the negative electrode of the diode D1, the in-phase end of the amplifier U1 and the power-off control module, the positive electrode of the diode D1 is grounded, the opposite-phase end of the amplifier U1 is connected with the other end of the resistor R2, one end of the resistor R3 and the abnormality alarming module, the other end of the resistor R3 is grounded, and the output end of the amplifier U1 is connected with the power-off control module.
As still further aspects of the utility model: the power-off control module comprises a relay J1, a diode D2, a resistor R4 and a MOS tube V1, wherein one end of the resistor R4 is connected with the output end of the amplifier U1, the other end of the resistor R4 is connected with the G pole of the MOS tube V1, the S pole of the MOS tube V1 is grounded, the D pole of the MOS tube V1 is connected with one end of the relay J1 and the anode of the diode D2, and the other end of the relay J1 is connected with the cathode of the diode D2 and the cathode of the diode D1.
As still further aspects of the utility model: the abnormality alarm module comprises an inverter U2, a MOS tube V2, the anode of a diode D3 and a loudspeaker SPEAKER, wherein the input end of the inverter U2 is connected with one end of a resistor R3, the output end of the inverter U2 is connected with the G electrode of the MOS tube V2, the S electrode of the MOS tube V2 is connected with the anode of the diode D3, the cathode of the diode D3 is grounded, the D electrode of the MOS tube V2 is connected with one end of the loudspeaker SPEAKER, and the other end of the loudspeaker SPEAKER is connected with the cathode of the diode D1.
As still further aspects of the utility model: the load working module comprises a switch S1, a switch S2 and an electronic load, wherein one end of the switch S1 is connected with a live wire L, the other end of the switch S1 is connected with one end of the electronic load, the other end of the electronic load is connected with one end of the switch S2, and the other end of the switch S2 is connected with a zero line N.
Compared with the prior art, the utility model has the beneficial effects that: the voltage stabilizing diode D1 is used as a part of detection equipment for detecting that the direct current output by the voltage reduction rectifying and filtering module exceeds a threshold value, and meanwhile, the stable voltage on the voltage stabilizing diode D1 is used as working voltage of the power-off control module and the abnormal alarm module, and compared with a traditional voltage protection circuit, the voltage protection circuit has fewer devices.
Drawings
Fig. 1 is a schematic diagram of an electronic load protection circuit.
Fig. 2 is a circuit diagram of an electronic load protection circuit.
Fig. 3 is a pin diagram of inverter 74LS 04.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present utility model are included in the protection scope of the present utility model.
Referring to fig. 1, an electronic load protection circuit includes:
the commercial power supply module is used for supplying alternating current and outputting the alternating current to the step-down rectifying and filtering module and the load working module;
the step-down rectifying and filtering module is used for converting alternating current into direct current and outputting the direct current to the overvoltage detection module;
the overvoltage detection module is used for providing stable voltage supply power-off control module and abnormal alarm module; when the direct current output by the step-down rectifying and filtering module exceeds a threshold value, a trigger signal is provided for the power-off control module;
the power-off control module is used for disconnecting the loops of the load working module and the mains supply module when receiving the control signal;
the abnormality alarm module is used for alarming and prompting when the overvoltage detection module is abnormal;
the load working module is used for powering the electronic load;
the commercial power supply module is connected with the step-down rectifying and filtering module and the load working module, the step-down rectifying and filtering module is connected with the overvoltage detection module, the overvoltage detection module is connected with the power-off control module and the abnormality alarm module, and the power-off control module is connected with the load working module.
In particular embodiments: the voltage is led in by the mains supply module through the live wire L and the zero line N, the voltage is reduced by the voltage reducing rectifying and filtering module through the transformer W, the rectifier T rectifies, the filtering circuit formed by the capacitor C1, the capacitor C2 and the inductor L1 carries out filtering treatment, namely, the current mains supply is sampled once to obtain once sampling voltage, and the once sampling voltage is output to the overvoltage detection module.
In this embodiment: referring to fig. 2, the overvoltage detection module includes a resistor R1, a diode D1, a resistor R2, a resistor R3, and an amplifier U1, wherein one end of the resistor R1 is connected to the buck rectifying filter module and one end of the resistor R2, the other end of the resistor R1 is connected to the negative electrode of the diode D1, the in-phase end of the amplifier U1 and the power-off control module, the positive electrode of the diode D1 is grounded, the opposite end of the amplifier U1 is connected to the other end of the resistor R2, one end of the resistor R3 and the abnormality alarm module, the other end of the resistor R3 is grounded, and the output end of the amplifier U1 is connected to the power-off control module.
The sum of the voltages on the resistor R2 and the resistor R3 is the primary sampling voltage, the voltage on the resistor R3 is the secondary sampling voltage and is output to the inverting terminal of the amplifier U1, the diode D1 is a voltage stabilizing diode, the upper voltage is stable and is output to the non-inverting terminal of the amplifier U1, when the mains supply is normal, the non-inverting terminal voltage of the amplifier U1 is higher than the inverting terminal voltage, the amplifier U1 outputs a high level, and the load working module is kept to work electrically; when the power supply of the mains supply is overlarge, the voltage of the in-phase terminal of the amplifier U1 is smaller than the voltage of the reverse-phase terminal, the amplifier U1 outputs a low level, and the load working module stops working; meanwhile, the voltage on the diode D1 is also used as the power supply voltage of the abnormality alarm module and the power-off control module.
In this embodiment: referring to fig. 2, the power-off control module includes a relay J1, a diode D2, a resistor R4, and a MOS tube V1, wherein one end of the resistor R4 is connected to the output end of the amplifier U1, the other end of the resistor R4 is connected to the G pole of the MOS tube V1, the S pole of the MOS tube V1 is grounded, and the D pole of the MOS tube V1 is connected to one end of the relay J1 and the positive pole of the diode D2, and the other end of the relay J1 is connected to the negative pole of the diode D2 and the negative pole of the diode D1.
When the mains supply is normal, the amplifier U1 outputs high level, the MOS tube V1 is conducted, the relay J1 is powered on to work, the switch S1 and the switch S2 are controlled to be closed, and a power supply loop of the mains supply module and the load working module is constructed; when the power supply of the mains supply is overlarge, the amplifier U1 outputs a low level, the MOS tube V1 is cut off, the relay J1 stops working, the switch S1 and the switch S2 are disconnected, and the power supply loops of the mains supply module and the load working module are disconnected.
In this embodiment: referring to fig. 2 and 3, the abnormality alarm module includes an inverter U2, a MOS tube V2, a positive electrode of a diode D3, and a SPEAKER, wherein an input end of the inverter U2 is connected to one end of a resistor R3, an output end of the inverter U2 is connected to a G electrode of the MOS tube V2, an S electrode of the MOS tube V2 is connected to the positive electrode of the diode D3, a negative electrode of the diode D3 is grounded, a D electrode of the MOS tube V2 is connected to one end of the SPEAKER, and the other end of the SPEAKER is connected to a negative electrode of the diode D1.
The abnormality alarm module is used for detecting whether the circuit of the resistor R2 and the resistor R3 is disconnected or not, so that the situation that when the power supply of the mains supply is overlarge, the circuit is disconnected, the load working module cannot be controlled to stop working, a user does not know the abnormal power supply, the electronic load is still continuously used, the electronic load is in a working environment higher than rated voltage for a long time, and damage is caused; when the circuit is disconnected, the input end of the inverter U2 is at a low level, the inverter U2 outputs a high level, then the MOS tube V2 is triggered to be conducted, the loudspeaker SPEAKER sounds to give an alarm, the light emitting diode D3 gives out a light indication, and a user is timely reminded. The inverter is 74LS04, 6 inverters are arranged in the inverter, and the single inverter can be continuously used after the fault change of the wiring of the single inverter and the change of the other inverter.
In this embodiment: referring to fig. 2, the load working module includes a switch S1, a switch S2, and an electronic load, wherein one end of the switch S1 is connected to the live wire L, the other end of the switch S1 is connected to one end of the electronic load, the other end of the electronic load is connected to one end of the switch S2, and the other end of the switch S2 is connected to the neutral wire N.
When the switches S1 and S2 are closed, the electronic load, the live wire L and the zero wire N form a loop, and the electric work is obtained.
The working principle of the utility model is as follows: the commercial power supply module supplies alternating current and outputs the alternating current to the step-down rectifying and filtering module and the load working module; the step-down rectifying and filtering module converts alternating current into direct current and outputs the direct current to the overvoltage detection module; the overvoltage detection module provides stable voltage to the power-off control module and the abnormality alarm module; when the direct current output by the step-down rectifying and filtering module exceeds a threshold value, a trigger signal is provided for the power-off control module; the power-off control module is used for disconnecting the loops of the load working module and the mains supply module when receiving the control signal; the abnormality alarming module alarms and prompts when the overvoltage detecting module is abnormal; the load work module is electrically operated by the electronic load.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (5)
1. An electronic load protection circuit, characterized in that:
the electronic load protection circuit includes:
the commercial power supply module is used for supplying alternating current and outputting the alternating current to the step-down rectifying and filtering module and the load working module;
the step-down rectifying and filtering module is used for converting alternating current into direct current and outputting the direct current to the overvoltage detection module;
the overvoltage detection module is used for providing stable voltage supply power-off control module and abnormal alarm module; when the direct current output by the step-down rectifying and filtering module exceeds a threshold value, a trigger signal is provided for the power-off control module;
the power-off control module is used for disconnecting the loops of the load working module and the mains supply module when receiving the control signal;
the abnormality alarm module is used for alarming and prompting when the overvoltage detection module is abnormal;
the load working module is used for powering the electronic load;
the commercial power supply module is connected with the step-down rectifying and filtering module and the load working module, the step-down rectifying and filtering module is connected with the overvoltage detection module, the overvoltage detection module is connected with the power-off control module and the abnormality alarm module, and the power-off control module is connected with the load working module.
2. The electronic load protection circuit according to claim 1, wherein the overvoltage detection module comprises a resistor R1, a diode D1, a resistor R2, a resistor R3, and an amplifier U1, one end of the resistor R1 is connected to the buck rectifying filter module, one end of the resistor R2, the other end of the resistor R1 is connected to the negative electrode of the diode D1, the in-phase end of the amplifier U1, the power-off control module, the positive electrode of the diode D1 is grounded, the opposite-phase end of the amplifier U1 is connected to the other end of the resistor R2, one end of the resistor R3, and the abnormality alarm module, the other end of the resistor R3 is grounded, and the output end of the amplifier U1 is connected to the power-off control module.
3. The electronic load protection circuit according to claim 2, wherein the power-off control module comprises a relay J1, a diode D2, a resistor R4, and a MOS tube V1, one end of the resistor R4 is connected to the output end of the amplifier U1, the other end of the resistor R4 is connected to the G pole of the MOS tube V1, the S pole of the MOS tube V1 is grounded, the D pole of the MOS tube V1 is connected to one end of the relay J1 and the positive pole of the diode D2, and the other end of the relay J1 is connected to the negative pole of the diode D2 and the negative pole of the diode D1.
4. The electronic load protection circuit according to claim 2, wherein the abnormality alarm module comprises an inverter U2, a MOS tube V2, a positive electrode of a diode D3, and a SPEAKER, an input end of the inverter U2 is connected to one end of a resistor R3, an output end of the inverter U2 is connected to a G electrode of the MOS tube V2, an S electrode of the MOS tube V2 is connected to the positive electrode of the diode D3, a negative electrode of the diode D3 is grounded, a D electrode of the MOS tube V2 is connected to one end of the SPEAKER, and the other end of the SPEAKER spear is connected to a negative electrode of the diode D1.
5. The electronic load protection circuit according to claim 1, wherein the load operation module comprises a switch S1, a switch S2, and an electronic load, one end of the switch S1 is connected to the live wire L, the other end of the switch S1 is connected to one end of the electronic load, the other end of the electronic load is connected to one end of the switch S2, and the other end of the switch S2 is connected to the neutral wire N.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320106998.8U CN219164221U (en) | 2023-02-03 | 2023-02-03 | Electronic load protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320106998.8U CN219164221U (en) | 2023-02-03 | 2023-02-03 | Electronic load protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219164221U true CN219164221U (en) | 2023-06-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320106998.8U Active CN219164221U (en) | 2023-02-03 | 2023-02-03 | Electronic load protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219164221U (en) |
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2023
- 2023-02-03 CN CN202320106998.8U patent/CN219164221U/en active Active
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| GR01 | Patent grant | ||
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Effective date of registration: 20231120 Address after: 201700 Room 204, 2nd Floor, Building 17, No. 599 Gaojing Road, Xujing Town, Qingpu District, Shanghai Patentee after: Shanghai Huixian Electronic Technology Co.,Ltd. Address before: No. 303, Unit 1, Building 14, No. 11 Fangbei Road, Chang'an District, Shijiazhuang City, Hebei Province, 050000 Patentee before: Chen Guang |