CN213484761U - Household electric shock prevention power supply - Google Patents
Household electric shock prevention power supply Download PDFInfo
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- CN213484761U CN213484761U CN202022635383.3U CN202022635383U CN213484761U CN 213484761 U CN213484761 U CN 213484761U CN 202022635383 U CN202022635383 U CN 202022635383U CN 213484761 U CN213484761 U CN 213484761U
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- power supply
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- 230000002265 prevention Effects 0.000 title claims abstract description 13
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 230000005611 electricity Effects 0.000 claims abstract description 10
- 238000002955 isolation Methods 0.000 claims description 14
- 230000000007 visual effect Effects 0.000 claims description 5
- 230000035939 shock Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The utility model discloses a household electric shock prevention power supply, which comprises a main control circuit, a commercial power interface and an electricity utilization interface, wherein the commercial power interface comprises an input protection ground, and the electricity utilization interface comprises an output protection ground; the grounding detection circuit comprises a resistance circuit which is connected between an input protection ground and an output protection ground in series; the grounding detection circuit collects the voltage between the input protection ground and the output protection ground through the resistance circuit and transmits the voltage to the main control circuit, and the main control circuit is used for controlling the opening and closing of the power utilization interface according to the received voltage. When the utility model is put into use, under normal conditions, the voltage detected by the resistance circuit is zero, and when a ground fault occurs, the voltage detected by the resistance circuit is nonzero, and at the moment, the main control unit controls the electric interface to be closed; the event the utility model discloses a domestic protection against electric shock power has the ground connection and detects the function, in time closes the power consumption interface when taking place ground fault to stop the contact occurence of failure.
Description
Technical Field
The utility model relates to the technical field of household appliances, especially, relate to a domestic protection against electric shock power.
Background
The existing household power supply is mainly provided with an electric shock prevention measure by adopting a leakage switch, an air switch, a leakage/air combination switch, a fuse and the like. Although the existing electric shock prevention measures can improve the safety of electricity utilization to a certain extent. However, there still exist some problems, such as that the switching action has a time delay, so that the response speed of the earth protection is slow, and after the switching action, a fault point is difficult to occur, so that an electric shock accident may occasionally occur. In addition, most of the existing household power supplies detect whether a ground fault exists or not by detecting current. Because the current detection has errors and contradiction also exists in the setting of the current threshold value, if the set current is small, false operation can occur, and the use is influenced; if the current setting is large, it is unsafe.
In view of the above technical problems, a person skilled in the art needs to design a household electric shock prevention power supply to accurately detect a ground fault.
SUMMERY OF THE UTILITY MODEL
To the above-mentioned not enough, the utility model discloses the technical problem that will solve is: the household electric shock prevention power supply has a grounding detection function, and the power utilization interface is timely closed when a grounding fault occurs so as to protect the power supply, equipment and a user.
In order to solve the technical problem, the technical scheme of the utility model is that:
a household electric shock prevention power supply comprises a main control circuit, and a mains supply interface and an electricity utilization interface which are respectively electrically connected with the main control circuit, wherein the mains supply interface comprises an input protection ground, and the electricity utilization interface comprises an output protection ground; the grounding detection circuit is electrically connected with the main control circuit and comprises a resistance circuit which is connected between the input protection ground and the output protection ground in series; the grounding detection circuit collects the voltage between the input protection ground and the output protection ground through the resistance circuit and transmits the voltage to the main control circuit, and the main control circuit is used for controlling the electric interface to be opened and closed according to the received voltage.
Preferably, the monitoring device further comprises an alarm circuit electrically connected with the main control circuit.
Preferably, the resistance circuit includes a detection resistor connected in series between the input protection ground and the output protection ground.
Preferably, the alarm circuit comprises an audible and visual alarm circuit.
Preferably, the alarm circuit comprises a wireless communication circuit, and the wireless communication circuit is used for being in wireless communication connection with the mobile terminal so as to transmit the alarm signal.
The preferred mode is that the power supply further comprises a rectifying filter circuit, a high-frequency inverter circuit, a high-frequency isolation circuit, a high-frequency rectifying filter circuit and a low-frequency inverter filter circuit which are electrically connected in sequence; the rectification filter circuit is electrically connected with the mains supply interface; the low-frequency inverter filter circuit is electrically connected with the power utilization interface; the high-frequency inverter circuit and the low-frequency inverter filter circuit are respectively electrically connected with the main control circuit.
Preferably, the high frequency isolation circuit comprises a 26KHz isolation transformer.
After the technical scheme is adopted, the beneficial effects of the utility model are that:
because the household electric shock prevention power supply comprises the main control circuit, the commercial power interface and the power utilization interface, the commercial power interface comprises an input protection ground, and the power utilization interface comprises an output protection ground; the grounding detection circuit comprises a resistance circuit which is connected between an input protection ground and an output protection ground in series; the grounding detection circuit collects the voltage between the input protection ground and the output protection ground through the resistance circuit and transmits the voltage to the main control circuit, and the main control circuit is used for controlling the opening and closing of the power utilization interface according to the received voltage. When the utility model is put into use, under normal conditions, the voltage detected by the resistance circuit is zero, and when a ground fault occurs, the voltage detected by the resistance circuit is nonzero, and at the moment, the main control unit controls the electric interface to be closed; the event the utility model discloses a domestic protection against electric shock power has the ground connection and detects the function, in time closes the power consumption interface when taking place ground fault to stop the contact occurence of failure. And the grounding detection circuit is completely isolated from the user power supply under the condition of no electric shock, so that the safe power utilization of the user is ensured. When the user gets an electric shock from the power supply, the user still can be safe because the power supply is connected with the ground at a single point.
And the alarm circuit is electrically connected with the main control circuit, so that an alarm is given out once a ground fault occurs, and a user is informed in time.
Because the resistance circuit comprises the detection resistor connected between the input protection ground and the output protection ground in series, the grounding detection is realized by adopting a simple circuit structure.
Because the alarm circuit comprises the sound-light alarm circuit, the user is informed through sound-light alarm.
The alarm circuit comprises a wireless communication circuit which is used for being in wireless communication connection with the mobile terminal so as to transmit the alarm signal; the user is notified via the wireless communication circuit.
Because the high-frequency isolation circuit comprises the 26KHz isolation transformer, the volume of the isolation transformer is reduced, and the volume of a power supply is reduced.
Drawings
FIG. 1 is a schematic block diagram of a household anti-electric shock power supply of the present invention;
FIG. 2 is a circuit diagram of a low frequency inverter filter in an embodiment;
FIG. 3 is a high-frequency inverter circuit diagram in the embodiment;
FIG. 4 is a circuit diagram of a rectifying and filtering circuit in an embodiment;
FIG. 5 is a circuit diagram of a high-frequency rectifying filter in the embodiment;
FIG. 6 is a circuit diagram of an electrical interface in an embodiment;
in the figure: 1-resistance circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1 and 2, a household electric shock protection power supply comprises a main control circuit, and a mains supply interface and an electricity utilization interface (as shown in fig. 6, the electricity utilization interface comprises a transformer T2 and a relay K2, and AC10 and AC11, and AC-10 and AC-11 are respectively electrically connected with the main control circuit), which are respectively electrically connected with the main control circuit, the mains supply interface comprises an input live wire, an input zero wire and an input protection ground, and the electricity utilization interface comprises an output live wire, an output zero wire and an output protection ground; the grounding detection circuit comprises a resistor circuit 1, the resistor circuit 1 comprises a detection resistor connected between an input protection ground and an output protection ground in series in the embodiment, and the detection resistor preferably has a resistance value of 1M ohm; the resistance circuit 1 is connected in series between an input protection ground and an output protection ground; the grounding detection circuit collects the voltage between an input protection ground and an output protection ground through the resistor circuit 1 and transmits the voltage to the main control circuit, and the main control circuit is used for controlling the opening and closing of the power utilization interface according to the received voltage.
The utility model discloses the ground connection detection circuitry who adopts, under the condition that does not have the electric shock, keep apart with user's power completely, guaranteed user's safe power consumption. When the user gets an electric shock from the power supply, the user still can be safe because the power supply is connected with the ground at a single point.
The utility model discloses after the input is used, output live wire, output zero line and input live wire, input zero line, input are kept apart completely under the normal condition. Therefore, the input zero line, the output zero line and the output live line have no current loop and no voltage. When output zero line or output live wire pass through human body or other reasons ground connection, if output protection ground and input protection ground all fine ground connection, then output return circuit has had public ground connection with input return circuit, and output live wire and output zero line have had voltage with the input zero line, the utility model discloses utilize this voltage to judge whether ground connection of output. If the output protective ground and the input protective ground are not grounded, the input loop and the output loop have a common ground due to the existence of the detection resistor, and voltages are provided between the output live wire and the output zero wire and between the input zero wire.
The grounding detection circuit judges whether grounding exists by utilizing the voltage between an input protection ground and an output protection ground, mainly utilizes the voltage between an output live wire and an output zero line and the voltage between the input zero line, and the detection voltage is 0V as long as the output is not in electric shock grounding. If the output is grounded, the detection voltage is more than 200V. Therefore, the utility model discloses a ground connection detection circuitry can not appear misjudgement, detects the accuracy, and the protection is fast.
As shown in fig. 1, the household electric shock prevention power supply further comprises an alarm circuit electrically connected with the main control circuit, the alarm circuit can comprise an audible and visual alarm circuit, the audible and visual alarm circuit can specifically comprise an LED lamp and a loudspeaker, when the ground fault does not occur, the LED lamp is not on, the loudspeaker does not sound, when the voltage received by the main control unit is non-zero, the main control unit transmits an alarm signal to the audible and visual alarm circuit, the LED lamp is not turned on, and the loudspeaker is not driven to sound. Moreover, the master control unit can control the LED lamp to strobe so as to give out more striking prompt.
The alarm circuit is not limited to the above list, and the alarm circuit may further include a wireless communication circuit for wirelessly communicating with the mobile terminal to transmit the alarm signal. After the alarm circuit is adopted, even if a user is not on site, the alarm circuit can receive an alarm signal, so that the aim of timely and effective alarming is fulfilled.
The power supply circuit also comprises a rectification filter circuit (the circuit structure is shown in fig. 4 and comprises rectifiers BT1 and BT2), a high-frequency inverter circuit (the circuit structure is shown in fig. 3), a high-frequency isolation circuit, a high-frequency rectification filter circuit (the circuit structure is shown in fig. 5) and a low-frequency inverter filter circuit (the circuit structure is shown in fig. 2), wherein the rectification filter circuit is electrically connected with a mains supply interface, and the low-frequency inverter filter circuit is electrically connected with an electric interface; the high-frequency inverter circuit and the low-frequency inverter filter circuit are respectively electrically connected with the main control circuit. The high-frequency isolation circuit comprises a 26KHz isolation transformer, so that the volume of the isolation transformer is reduced, and the volume of a power supply is reduced.
To sum up, compared with the prior art, the utility model, have following advantage:
1. the user power supply directly enters water without electric shock, and can touch a zero line and a live wire by bare feet, so that the safety and reliability of power utilization are greatly improved;
2. the leakage current is small, and a high-frequency isolation circuit is adopted, so that the leakage current is small and reaches microampere level;
3. the volume is small, and the household installation is convenient;
4. the leakage automatically cuts off the power supply and gives an alarm to immediately remind the user of short-distance fault.
The above-mentioned preferred embodiments of the present invention are not intended to limit the present invention, and any modifications made within the spirit and principles of the present invention, as well as improvements made to the same household anti-electric shock power source, should be included within the scope of the present invention.
Claims (7)
1. The household electric shock prevention power supply comprises a main control circuit, and a mains supply interface and an electricity utilization interface which are respectively electrically connected with the main control circuit, wherein the mains supply interface comprises an input protection ground, and the electricity utilization interface comprises an output protection ground; the circuit is characterized by further comprising a grounding detection circuit electrically connected with the main control circuit, wherein the grounding detection circuit comprises a resistance circuit which is connected in series between the input protection ground and the output protection ground;
the grounding detection circuit collects the voltage between the input protection ground and the output protection ground through the resistance circuit and transmits the voltage to the main control circuit, and the main control circuit is used for controlling the electric interface to be opened and closed according to the received voltage.
2. The household electric shock protection power supply according to claim 1, further comprising an alarm circuit electrically connected to the main control circuit.
3. The home protected shock power supply of claim 1 wherein the resistance circuit includes a sense resistor connected in series between the input protected ground and the output protected ground.
4. The household electric shock protection power supply according to claim 2, wherein the alarm circuit comprises an audible and visual alarm circuit.
5. The household electric shock prevention power supply as set forth in claim 2, wherein the alarm circuit comprises a wireless communication circuit for wireless communication connection with a mobile terminal to transmit the alarm signal.
6. The household electric shock prevention power supply according to any one of claims 1 to 5, further comprising a rectifying filter circuit, a high-frequency inverter circuit, a high-frequency isolation circuit, a high-frequency rectifying filter circuit and a low-frequency inverter filter circuit which are electrically connected in sequence;
the rectification filter circuit is electrically connected with the mains supply interface;
the low-frequency inverter filter circuit is electrically connected with the power utilization interface;
the high-frequency inverter circuit and the low-frequency inverter filter circuit are respectively electrically connected with the main control circuit.
7. The household protected against electric shock power supply of claim 6, wherein said high frequency isolation circuit comprises a 26KHz isolation transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022635383.3U CN213484761U (en) | 2020-11-13 | 2020-11-13 | Household electric shock prevention power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022635383.3U CN213484761U (en) | 2020-11-13 | 2020-11-13 | Household electric shock prevention power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213484761U true CN213484761U (en) | 2021-06-18 |
Family
ID=76355132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022635383.3U Expired - Fee Related CN213484761U (en) | 2020-11-13 | 2020-11-13 | Household electric shock prevention power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213484761U (en) |
-
2020
- 2020-11-13 CN CN202022635383.3U patent/CN213484761U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210618 |