CN206831847U - Electric heater and its heating control apparatus - Google Patents
Electric heater and its heating control apparatus Download PDFInfo
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- CN206831847U CN206831847U CN201720622738.0U CN201720622738U CN206831847U CN 206831847 U CN206831847 U CN 206831847U CN 201720622738 U CN201720622738 U CN 201720622738U CN 206831847 U CN206831847 U CN 206831847U
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 229
- 238000001514 detection method Methods 0.000 claims abstract description 209
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 66
- 239000003990 capacitor Substances 0.000 claims description 7
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- 238000010586 diagram Methods 0.000 description 5
- 230000003245 working effect Effects 0.000 description 3
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Abstract
The utility model discloses a kind of electric heater and its heating control apparatus, the heating control apparatus includes：Multiple first relays, each first relay is correspondingly connected in each heating circuit, with the break-make of heating circuit corresponding to control；Second relay, the second relay are connected with the common port of each heating circuit, to control the break-make of multiple heating circuits；Multiple detection units, each detection unit correspondingly detect the working condition of each first relay to export detection signal；Control unit, when control unit judges that any one first relay breaks down according to detection signal, by being controlled such that each heater strip is stopped to each first relay and the second relay.The control device can reliably control relay be disconnected when relay breaks down, and avoids the occurrence of the situation of more high-power heater strips while work, and then the high-current device of electric heater can be protected, while eliminates disaster hidden-trouble.
Description
Technical Field
The utility model relates to a water heater technical field especially relates to an electric water heater's heating control device and an electric water heater.
Background
At present, most of electric water heaters use relays to control the on-off of heating wires, and along with the increasing requirement of customers on quick heating, the power of a single heating wire is gradually increased. For example, for an electric water heater with quick heating or instant heating function, a plurality of high-power heating wires are adopted, and the power of a single heating wire reaches more than 2500W.
However, once a circuit for controlling a relay has a fault or the relay is damaged, the power supply line in a common city can be used for starting a plurality of high-power heating wires at the same time, so that the power consumption of the electric water heater exceeds 5000W. This can cause damage to the high current devices of the electric water heater, and also to the power grid lines of the users, which can cause fire in severe cases.
SUMMERY OF THE UTILITY MODEL
The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, the utility model discloses a first aim at provides an electric water heater's heating control device, and this controlling means can control the relay disconnection reliably when the relay breaks down, avoids appearing the condition of many high-power heater strips simultaneous workings, and then can protect electric water heater's heavy current part, eliminates the conflagration hidden danger simultaneously.
A second object of the present invention is to provide an electric water heater.
In order to achieve the above object, the present invention provides in a first aspect a heating control device for a water heater, the water heater includes a plurality of parallel heating circuits, each heating circuit is provided with a heating wire, and the heating control device includes: each first relay in the plurality of first relays is correspondingly connected in each heating loop so as to control the on-off of the corresponding heating loop; the second relay is connected with the common end of each heating loop so as to control the on-off of all the heating loops; each detection unit in the plurality of detection units correspondingly detects the working state of each first relay to output a detection signal; and the control unit is respectively connected with each first relay, the second relay and each detection unit, and when the control unit judges that any one of the first relays has a fault according to the detection signal, each first relay and the second relay are controlled to stop working of each heating wire in the heating loops.
According to the utility model discloses a heating control device of electric water heater, through every first relay correspond the break-make of the heating circuit that the control corresponds, the whole break-make of a plurality of heating circuits of second relay control, every detecting element corresponds the operating condition who detects every first relay with output detected signal, when the arbitrary one in a plurality of first relays breaks down according to detected signal judgement, through controlling every heater strip in order to make a plurality of heating circuits all stop work to every first relay and second relay. Therefore, the control device can reliably control the relay to be disconnected when the relay breaks down, the condition that a plurality of high-power heating wires work simultaneously is avoided, and then a high-current component of the electric water heater can be protected, and meanwhile, fire hazard is eliminated.
In addition, according to the present invention, the heating control device of the electric water heater can further have the following additional technical features:
specifically, when the plurality of heating loops include a first heating loop and a second heating loop, the first heating loop includes a first heating wire, the second heating loop includes a second heating wire, the plurality of detecting units include a first detecting unit and a second detecting unit, one end of the first heating wire is connected to a zero line end of a power supply through the second relay, the other end of the first heating wire is connected to a live line end of the power supply through a first relay in the first heating loop, one end of the second heating wire is connected to the zero line end of the power supply through the second relay, and the other end of the second heating wire is connected to the live line end of the power supply through a first relay in the second heating loop, wherein when the first detecting unit and the second detecting unit both detect that the corresponding first relay is in a closed state, the control unit controls the second relay to be switched off so that the first heating circuit and the second heating circuit are switched off.
Further, the first detection unit includes a plurality of first detection circuits, the second detection unit includes a plurality of second detection circuits, each of the plurality of first detection circuits is used for detecting the working state of a first relay in the first heating loop to correspondingly output a first detection signal, each of the plurality of second detection circuits is configured to detect an operating state of the first relay in the second heating circuit to output a second detection signal, wherein the control unit judges that the first detection unit has a failure when the first detection signal output from any one of the plurality of first detection circuits is not identical to the first detection signals output from the remaining first detection circuits, the second relay is controlled to be switched off, so that the first heating loop and the second heating loop are switched off; when the second detection signal output by any one of the second detection circuits is inconsistent with the second detection signals output by the rest of the second detection circuits, the control unit judges that the second detection unit has a fault and controls the second relay to be switched off so as to switch off the first heating circuit and the second heating circuit.
Specifically, the control unit further controls the second relay to be turned off when judging that both the first relay and the first detection unit in the first heating circuit have a fault or when judging that both the first relay and the second detection unit in the second heating circuit have a fault according to the first detection signal output by each first detection circuit and the second detection signal output by each second detection circuit, so that both the first heating circuit and the second heating circuit are turned off.
Specifically, the control unit includes: each first relay control circuit in the plurality of first relay control circuits correspondingly controls the on or off of each first relay; a second relay control circuit for controlling the second relay to be closed or opened; the single chip microcomputer comprises a plurality of first control ports, a second control port and a plurality of detection port groups, each first control port is correspondingly connected with each first relay control circuit, the second control port is connected with the second relay control circuit, and each detection port group is correspondingly connected with each detection unit.
Specifically, the first detection circuit and the second detection circuit have the same circuit structure, and the first detection circuit includes: one end of the first resistor is connected with the switch output end of the first relay; the cathode of the diode is connected with the other end of the first resistor, and the anode of the diode is connected with the zero line end; the photoelectric coupler comprises a light emitting diode and a phototriode, the anode of the light emitting diode is respectively connected with the other end of the first resistor and the cathode of the diode, and the cathode of the light emitting diode is respectively connected with the anode of the diode and the zero line end; one end of the second resistor is connected with a preset power supply, and the other end of the second resistor is connected with a collector electrode of the phototriode; one end of the third resistor is connected with the other end of the second resistor and the collector of the phototriode respectively; and one end of the first capacitor is connected with the other end of the third resistor and is provided with a first connecting point, the first connecting point is the output end of the first detection circuit, and the other end of the first capacitor is connected with the emitting electrode of the phototriode and then is grounded.
Further, when the first detection signal output by the first detection circuit is a square wave signal, the first relay in the first heating circuit is in a closed state.
In order to achieve the above object, a second aspect of the present invention provides an electric water heater, which includes the above heating control device.
The utility model discloses an electric water heater, through foretell electric water heater's heating control device, can control the relay disconnection reliably when the relay breaks down, avoid appearing the condition of many high-power heater strips simultaneous workings, and then can protect heavy current parts, eliminate the conflagration hidden danger simultaneously.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which,
fig. 1 is a block schematic diagram of a heating control device of an electric water heater according to an embodiment of the present invention;
fig. 2 is a block schematic diagram of a heating control device of an electric water heater according to another embodiment of the present invention;
fig. 3 is a circuit diagram of a detection circuit according to an embodiment of the present invention;
fig. 4 is a schematic connection diagram of a relay according to an embodiment of the present invention; and
fig. 5 is a flowchart of a heating control method of an electric water heater according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
The heating control device of the electric water heater, the electric water heater and the heating control method of the electric water heater according to the embodiments of the present invention are described below with reference to the accompanying drawings.
Fig. 1 is a block diagram of a heating control device of an electric water heater according to an embodiment of the present invention. The electric water heater comprises a plurality of heating loops connected in parallel, and each heating loop is internally provided with a heating wire. As shown in fig. 1, the heating control device includes: a plurality of first relays 10, a second relay 20, a plurality of detection units 30, and a control unit 40.
Wherein, each first relay 10 in a plurality of first relays 10 is correspondingly connected in each heating circuit to control the on-off of the corresponding heating circuit. A second relay 20 is connected to the common terminal of each heating circuit to control the switching of all of the plurality of heating circuits. Each of the plurality of detecting units 30 detects an operating state of each of the first relays 10 to output a detection signal. The control unit 40 is respectively connected with each first relay 10, each second relay 20 and each detection unit 30, and when the control unit 40 judges that any one of the first relays 10 has a fault according to the detection signal, each heating wire in the plurality of heating circuits stops working by controlling each first relay 10 and each second relay 20.
Specifically, the number of the first relays 10 may be 2 or more, and accordingly, the number of the heating wire and detecting units 40 may be 2 or more. Taking 2 first relays 10 as an example, when the electric water heater operates normally, two heating wires cannot work simultaneously. When the control circuits of the two first relays 10 are short-circuited at the same time or the two first relays 10 are stuck, the two first relays 10 are both in a closed state, so that the two heating wires work at the same time, a large-current device of the electric water heater can be damaged, a power grid line of a user can be damaged, and a fire disaster can be caused in severe cases.
For this reason, in the embodiment of the present invention, when the first relay 10 is in different states (on/off), the detection signal output by the detection unit 30 provided correspondingly is different. The control unit 40 can judge whether the first relays 10 have a short-circuit fault according to the detection signal, if any one of the first relays 10 has a short-circuit fault, the control unit 40 controls the second relays 20 to be immediately opened so that the power supply circuit of each heating wire is opened, and meanwhile, if the first relays 10 are in an opened state, the control unit 40 controls the first relays 10 to be prohibited from being closed, and if the first relays 10 are in a closed state, the first relays 10 are immediately opened. Therefore, the control device can reliably control the relay to be disconnected when the relay breaks down, the condition that a plurality of high-power heating wires work simultaneously is avoided, and then a large-current device of the electric water heater can be protected, and meanwhile, fire hazards are eliminated.
Further, as shown in fig. 1, according to an embodiment of the present invention, when the plurality of heating loops include a first heating loop and a second heating loop, the first heating loop includes a first heating wire 51, the second heating loop includes a second heating wire 52, the plurality of detecting units 30 include a first detecting unit 31 and a second detecting unit 32, one end of the first heating wire 51 is connected to the neutral terminal N of the power supply AC through a second relay 20, the other end of the first heating wire 51 is connected to the live terminal L of the power supply AC through a first relay 10 in the first heating loop, one end of the second heating wire 52 is connected to the neutral terminal N of the power supply AC through a second relay 20, and the other end of the second heating wire 52 is connected to the live terminal L of the power supply AC through a first relay 10 in the second heating loop. When the first detection unit 31 and the second detection unit 32 both detect that the corresponding first relay is in the closed state, the control unit 40 controls the second relay 20 to be opened, so that the first heating circuit and the second heating circuit are both opened.
That is, when the electric water heater has two high power heating wires, the number of the first relays 10 is 2, and accordingly, the number of the sensing units 30 is 2. The control unit 40 may determine whether or not a simultaneous closing of the two first relays 10 occurs according to the detection signal. If the control unit 40 judges that a situation occurs in which both first relays 10 are closed at the same time, the control unit 40 immediately controls the second relay 20 to be opened so that the power supply circuit of each heating wire is opened, thereby stopping the operation of each heating wire. Therefore, the control device can avoid the condition that a plurality of high-power heating wires work simultaneously, and further can protect a high-current device of the electric water heater and eliminate fire hazard at the same time.
According to an embodiment of the present invention, as shown in fig. 2, the first detecting unit 31 may include a plurality of first detecting circuits 311, the second detecting unit 32 may include a plurality of second detecting circuits 321, each first detecting circuit 311 of the plurality of first detecting circuits 311 is respectively used for detecting an operating state of the first relay 10 in the first heating circuit to correspondingly output the first detecting signal, and each second detecting circuit 321 of the plurality of second detecting circuits 321 is respectively used for detecting an operating state of the first relay 10 in the second heating circuit to correspondingly output the second detecting signal. When the first detection signal output by any one first detection circuit 311 in the plurality of first detection circuits 311 is inconsistent with the first detection signals output by the remaining first detection circuits, the control unit 40 determines that the first detection unit 31 has a fault and controls the second relay 20 to be switched off so as to switch off the first heating circuit and the second heating circuit. When the second detection signal output from any one of the second detection circuits 321 is inconsistent with the second detection signals output from the remaining second detection circuits 321, the control unit 40 determines that the second detection unit 32 has a fault, and controls the second relay 20 to be turned off so that the first heating circuit and the second heating circuit are both turned off.
Specifically, the first detection circuit 311 and the second detection circuit 321 may be 2 or more. As shown in fig. 2, taking 2 first detection circuits 311 in the first detection unit 31 and 2 second detection circuits 321 in the second detection unit 32 as an example, when the detection signals output by the two first detection circuits 311 in the first detection unit 31 are not consistent, it is indicated that a failure occurs in one of the first detection circuits 311, and at this time, the control unit 40 controls the second relay 20 to be turned off, so that the first heating circuit and the second heating circuit are both turned off, and the electric water heater stops heating. Similarly, when the detection signals output by the two second detection circuits 321 in the second detection unit 32 are inconsistent, it indicates that a fault occurs in one of the second detection circuits 321, and at this time, the control unit 40 controls the second relay 20 to be turned off, so that the first heating circuit and the second heating circuit are both turned off, and the electric water heater stops heating.
Further, as shown in fig. 3, the circuit structures of the first detection circuit 311 and the second detection circuit 321 are the same, and the first detection circuit 311 may include: the circuit comprises a first resistor R1, a first diode D, a photoelectric coupler OC, a second resistor R2, a third resistor R3 and a first capacitor C1.
One end of the first resistor R1 is connected to the switch output terminal of the first relay 10. The cathode of the first diode D is connected to the other end of the first resistor R1, and the anode of the first diode D is connected to the neutral terminal N. The photoelectric coupler OC comprises a light-emitting diode VD and a phototriode Q, the anode of the light-emitting diode VD is respectively connected with the other end of the first resistor R1 and the cathode of the diode D, and the cathode of the light-emitting diode VD is respectively connected with the anode of the first diode D and the zero line end N
. One end of the second resistor R2 is connected to the preset power VCC, and the other end of the second resistor R2 is connected to the collector of the phototransistor Q. One end of the third resistor R3 is connected to the other end of the second resistor R2 and the collector of the phototransistor Q, respectively. One end of the first capacitor C1 is connected to the other end of the third resistor R3 and has a first connection point a, the first connection point a is an output end of the first detection circuit 311, and the other end of the first capacitor C1 is connected to the emitter of the phototransistor Q and then grounded.
It can be understood that, in an embodiment of the present invention, when the first detection signal output by the first detection circuit 311 is a square wave signal, the first relay 10 in the first heating circuit is in a closed state.
Specifically, when the first relay 10 corresponding to the first detection unit 31 is closed, 220V ac power is output to the two first detection circuits 311, and a square wave signal is generated at the secondary side of the photocoupler OC through reverse conduction of the photocoupler OC and the diode D, that is, the two first detection circuits 311 output the square wave signal. When the first relay 10 is turned off, the two first detection circuits 311 output low level signals. If the control unit 40 determines that the detection signals output by the first detection circuit 311 are inconsistent, for example, one is a square wave signal and the other is a low level signal, which indicates that an open circuit fault may occur in the first detection circuit 311, at this time, the control unit 40 controls the second relay 20 to open, and prohibits the other first relay 10 from closing, so that the first heating circuit and the second heating circuit are both open.
According to an embodiment of the present invention, the control unit 40 further controls the second relay 20 to be turned off when the first relay 10 and the first detection unit 31 in the first heating circuit are all failed or when the first relay 10 and the second detection unit 32 in the second heating circuit are all failed according to the first detection signal output by each first detection circuit 311 and the second detection signal output by each second detection circuit 321, so that the first heating circuit and the second heating circuit are both turned off.
Specifically, when the control circuits of the two first relays 10 are short-circuited simultaneously or the two first relays 10 are stuck to cause the two first relays 10 to be closed, the first detection signal output by each first detection circuit 311 and the second detection signal output by each second detection circuit 321 are both square wave signals, and the control unit 40 immediately controls the second relay 20 to be opened, so that the first heating circuit and the second heating circuit are both opened. At this time, even if one of the first detection circuits 311 in the first detection unit 31 has an open-circuit fault, one of the first detection signals is a square wave signal, and the other is a low level signal; or when one of the second detection circuits 321 in the second detection unit 32 has an open circuit fault, one of the second detection signals is a square wave signal, and the other is a low level signal, the control unit 40 can still determine the relay fault or the detection circuit fault according to the first detection signal and the second detection signal. That is, even if one of the detection circuits fails, the other can reliably detect the relay failure. Therefore, when the electric water heater has double faults, the device can still reliably control the high-power heating wire to stop working, and the working safety of the electric water heater is improved.
In the embodiment of the present invention, as shown in fig. 2, the control unit 40 includes: a plurality of first relay control circuits 401, a plurality of second relay control circuits 402, and a single chip microcomputer 403.
Wherein, each first relay control circuit 401 in the plurality of first relay control circuits 401 controls the closing or opening of each first relay 10 correspondingly. The second relay control circuit 402 is used to control the closing or opening of the second relay 20. The single chip microcomputer 403 comprises a plurality of first control ports U1, a second control port U2 and a plurality of detection ports U3, wherein each first control port U1 is correspondingly connected with each first relay control circuit 401, the second control port U2 is connected with the second relay control circuit 402, and each detection port U3 is correspondingly connected with each detection unit 30. The single chip microcomputer 403 respectively controls the on-off of the first relay 10 and the second relay 20 by controlling the first relay control circuit 401 and the second relay control circuit 402.
It is understood that, in the embodiment of the present invention, the first relay 10 and the second relay 20 include a switch, a coil and a diode, and the connection manner thereof is as shown in fig. 4.
In summary, according to the heating control device of the electric water heater of the embodiment of the present invention, the on/off of the corresponding heating circuit is correspondingly controlled through each first relay, the second relay controls the whole on/off of the plurality of heating circuits, each detecting unit correspondingly detects the operating state of each first relay to output the detecting signal, and if the controlling unit determines that any one of the plurality of first relays fails according to the detecting signal, each heating wire in the plurality of heating circuits stops working by controlling each first relay and each second relay; and if the control unit judges that the detection unit has faults according to the detection signal or judges that the first relay and the corresponding detection unit have faults, the control unit controls the second relay to be switched off so as to switch off the first heating circuit and the second heating circuit. Therefore, the control device can reliably control the relay to be disconnected when the electric water heater has double faults, the condition that a plurality of high-power heating wires work simultaneously is avoided, and then a large-current component of the electric water heater can be protected, and meanwhile, fire hazards are eliminated.
In addition, the embodiment of the utility model provides an electric water heater is still provided, and it includes foretell electric water heater's heating control device.
The utility model discloses electric water heater, through foretell electric water heater's heating control device, can control the relay disconnection reliably when the relay breaks down, avoid appearing the condition of many high-power heater strips simultaneous workings, and then can protect heavy current parts, eliminate the conflagration hidden danger simultaneously.
Based on the electric water heater, the embodiment of the utility model also provides an electric water heater's heating control method. Fig. 5 is a flowchart of a heating control method of an electric water heater according to an embodiment of the present invention. As shown in fig. 5, the method comprises the steps of:
and S1, detecting the working state of each first relay to output a detection signal.
And S2, when any one of the first relays is judged to be in fault according to the detection signal, each first relay and each second relay are controlled to stop working of each heating wire in the heating loops.
Specifically, as shown in fig. 1, when the first relay is in different states (on/off), the detection signals output correspondingly are different. And judging whether the first relays have short-circuit faults or not according to the detection signals, if any one of the first relays has the short-circuit fault, controlling the second relays to be immediately controlled to be switched off so as to switch off the power supply circuit of each heating wire, and meanwhile, if the first relays are in an off state, prohibiting the first relays from being switched on, and if the first relays are in an on state, immediately switching off the first relays. Therefore, the control method can reliably control the relay to be disconnected when the relay breaks down, avoids the situation that a plurality of high-power heating wires work simultaneously, further can protect a high-current device of the electric water heater, and meanwhile eliminates fire hazard.
Further, as shown in fig. 1, when the plurality of heating loops include a first heating loop and a second heating loop, the first heating loop includes a first heating wire, the second heating loop includes a second heating wire, the plurality of detecting units include a first detecting unit and a second detecting unit, one end of the first heating wire is connected to the zero line end of the power supply through a second relay, the other end of the first heating wire is connected to the live wire end of the power supply through a first relay in the first heating loop, one end of the second heating wire is connected to the zero line end of the power supply through a second relay, and the other end of the second heating wire is connected to the live wire end of the power supply through a first relay in the second heating loop. When the first detection unit and the second detection unit detect that the corresponding first relays are in the closed state, the second relays are controlled to be switched off, so that the first heating circuit and the second heating circuit are switched off.
That is, when the electric water heater has two high power heating wires, the number of the first relays is 2, and correspondingly, the number of the sensing units is 2. Whether the condition that the two first relays are simultaneously closed occurs can be judged according to the detection signal. And if the situation that the two first relays are closed simultaneously is judged to occur, immediately controlling the second relay to be opened so as to disconnect the power supply loop of each heating wire, and stopping each heating wire. Therefore, the control device can avoid the condition that a plurality of high-power heating wires work simultaneously, and further can protect a high-current device of the electric water heater and eliminate fire hazard at the same time.
Further, as shown in fig. 2, the first detection unit may include a plurality of first detection circuits, and the second detection unit may include a plurality of second detection circuits, each of the plurality of first detection circuits being respectively configured to detect an operation state of the first relay in the first heating circuit to respectively output the first detection signal, and each of the plurality of second detection circuits being respectively configured to detect an operation state of the first relay in the second heating circuit to respectively output the second detection signal.
When the first detection signal output by any one of the first detection circuits is inconsistent with the first detection signals output by the rest of the first detection circuits, the control unit judges that the first detection unit has a fault and controls the second relay to be switched off so as to switch off the first heating circuit and the second heating circuit. When the second detection signal output by any one of the second detection circuits is inconsistent with the second detection signals output by the rest of the second detection circuits, the control unit judges that the second detection unit has a fault and controls the second relay to be switched off so as to switch off the first heating circuit and the second heating circuit.
And when the first relay and the first detection unit in the first heating circuit are judged to be in fault according to the first detection signal output by each first detection circuit and the second detection signal output by each second detection circuit, or the first relay and the second detection unit in the second heating circuit are judged to be in fault, the second relay is controlled to be switched off, so that the first heating circuit and the second heating circuit are switched off.
Specifically, the first detection circuit and the second detection circuit may be 2 or more. As shown in fig. 2, taking 2 first detection circuits in the first detection unit and 2 second detection circuits in the second detection unit as an example, when the detection signals output by the two first detection circuits in the first detection unit are not consistent, it indicates that a certain first detection circuit has a fault, and at this time, the control unit controls the second relay to be switched off, so that the first heating circuit and the second heating circuit are both switched off, and the electric water heater stops heating. Similarly, when the detection signals output by the two second detection circuits in the second detection unit are inconsistent, it is indicated that a certain second detection circuit has a fault, and at this time, the control unit controls the second relay to be switched off, so that the first heating circuit and the second heating circuit are both switched off, and the electric water heater stops heating.
When the control circuits of the two first relays are in short circuit simultaneously or the two first relays are in adhesion fault to close the two first relays, the first detection signal output by each first detection circuit and the second detection signal output by each second detection circuit are both square wave signals, and the control unit immediately controls the second relays to be switched off so that the first heating circuit and the second heating circuit are both switched off. At this time, even if one of the first detection circuits in the first detection unit has an open circuit fault, one of the first detection signals is a square wave signal, and the other one is a low level signal; or a certain second detection circuit in the second detection unit has an open circuit fault, wherein one second detection signal is a square wave signal, and the other second detection signal is a low level signal, and the control unit can still judge the fault of the relay or the fault of the detection circuit according to the first detection signal and the second detection signal. That is, even if one of the detection circuits fails, the other can reliably detect the relay failure. Therefore, when the electric water heater has double faults, the method can still reliably control the high-power heating wire to stop working, and improves the working safety of the electric water heater.
In summary, according to the heating control method of the electric water heater of the embodiment of the present invention, firstly, the working state of each first relay is detected to output the detection signal, and if it is determined that any one of the plurality of first relays fails according to the detection signal, each heating wire in the plurality of heating loops is stopped by controlling each first relay and the second relay; and if the detection unit is judged to have a fault or the first relay and the corresponding detection unit both have faults according to the detection signal, the second relay is controlled to be switched off so as to switch off the first heating circuit and the second heating circuit. Therefore, the method can reliably control the relay to be disconnected when the electric water heater has double faults, avoid the condition that a plurality of high-power heating wires work simultaneously, further protect high-current components of the electric water heater and eliminate fire hazard.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (8)
1. A heating control device of an electric water heater is characterized in that the electric water heater comprises a plurality of heating loops connected in parallel, a heating wire is arranged in each heating loop, and the heating control device comprises:
each first relay in the plurality of first relays is correspondingly connected in each heating loop so as to control the on-off of the corresponding heating loop;
the second relay is connected with the common end of each heating loop so as to control the on-off of all the heating loops;
each detection unit in the plurality of detection units correspondingly detects the working state of each first relay to output a detection signal;
and the control unit is respectively connected with each first relay, the second relay and each detection unit, and when the control unit judges that any one of the first relays has a fault according to the detection signal, each first relay and the second relay are controlled to stop working of each heating wire in the heating loops.
2. The heating control device of an electric water heater according to claim 1, wherein when the plurality of heating circuits includes a first heating circuit and a second heating circuit, the first heating circuit includes a first heating wire, the second heating circuit includes a second heating wire, the plurality of detecting units include a first detecting unit and a second detecting unit, one end of the first heating wire is connected to a neutral terminal of an electric power supply through the second relay, the other end of the first heating wire is connected to a live terminal of the electric power supply through the first relay in the first heating circuit, one end of the second heating wire is connected to the neutral terminal of the electric power supply through the second relay, and the other end of the second heating wire is connected to the live terminal of the electric power supply through the first relay in the second heating circuit, wherein,
when the first detection unit and the second detection unit detect that the corresponding first relay is in a closed state, the control unit controls the second relay to be disconnected, so that the first heating loop and the second heating loop are both disconnected.
3. The heating control device of an electric water heater according to claim 2, wherein the first detecting unit comprises a plurality of first detecting circuits, the second detecting unit comprises a plurality of second detecting circuits, each of the plurality of first detecting circuits is used for detecting the working state of the first relay in the first heating circuit to output the first detecting signal correspondingly, each of the plurality of second detecting circuits is used for detecting the working state of the first relay in the second heating circuit to output the second detecting signal correspondingly, wherein,
when the first detection signal output by any one first detection circuit in the plurality of first detection circuits is inconsistent with the first detection signals output by the rest first detection circuits, the control unit judges that the first detection unit has a fault and controls the second relay to be switched off so as to switch off the first heating circuit and the second heating circuit;
when the second detection signal output by any one of the second detection circuits is inconsistent with the second detection signals output by the rest of the second detection circuits, the control unit judges that the second detection unit has a fault and controls the second relay to be switched off so as to switch off the first heating circuit and the second heating circuit.
4. The heating control device of the electric water heater according to claim 3, wherein the control unit further controls the second relay to be turned off when the first relay and the first detecting unit in the first heating circuit are judged to be failed or when the first relay and the second detecting unit in the second heating circuit are judged to be failed according to the first detecting signal output by each first detecting circuit and the second detecting signal output by each second detecting circuit, so that the first heating circuit and the second heating circuit are both turned off.
5. The heating control device of the electric water heater according to any one of claims 1-4, wherein the control unit comprises:
each first relay control circuit in the plurality of first relay control circuits correspondingly controls the on or off of each first relay;
a second relay control circuit for controlling the second relay to be closed or opened;
the single chip microcomputer comprises a plurality of first control ports, a plurality of second control ports and a plurality of detection ports, each first control port is correspondingly connected with each first relay control circuit, each second control port is connected with each second relay control circuit, and each detection port group is correspondingly connected with each detection unit.
6. The heating control device of the electric water heater according to claim 3, wherein the first detection circuit and the second detection circuit have the same circuit structure, and the first detection circuit includes:
one end of the first resistor is connected with the switch output end of the first relay;
the cathode of the diode is connected with the other end of the first resistor, and the anode of the diode is connected with the zero line end;
the photoelectric coupler comprises a light emitting diode and a phototriode, the anode of the light emitting diode is respectively connected with the other end of the first resistor and the cathode of the diode, and the cathode of the light emitting diode is respectively connected with the anode of the diode and the zero line end;
one end of the second resistor is connected with a preset power supply, and the other end of the second resistor is connected with a collector electrode of the phototriode;
one end of the third resistor is connected with the other end of the second resistor and the collector of the phototriode respectively;
and one end of the first capacitor is connected with the other end of the third resistor and is provided with a first connecting point, the first connecting point is the output end of the first detection circuit, and the other end of the first capacitor is connected with the emitting electrode of the phototriode and then is grounded.
7. The heating control device of the electric water heater as claimed in claim 6, wherein when the first detection signal outputted from the first detection circuit is a square wave signal, the first relay in the first heating circuit is in a closed state.
8. An electric water heater comprising the heating control device of the electric water heater as claimed in any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720622738.0U CN206831847U (en) | 2017-05-31 | 2017-05-31 | Electric heater and its heating control apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720622738.0U CN206831847U (en) | 2017-05-31 | 2017-05-31 | Electric heater and its heating control apparatus |
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| Publication Number | Publication Date |
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| CN206831847U true CN206831847U (en) | 2018-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720622738.0U Withdrawn - After Issue CN206831847U (en) | 2017-05-31 | 2017-05-31 | Electric heater and its heating control apparatus |
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| CN (1) | CN206831847U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108981181A (en) * | 2017-05-31 | 2018-12-11 | 芜湖美的厨卫电器制造有限公司 | Electric heater and its heating control apparatus and method |
| CN109683049A (en) * | 2018-12-19 | 2019-04-26 | 珠海蓉胜电子材料研究院有限公司 | A kind of pair of heater circuit carries out method, computer installation and the computer readable storage medium of fault detection |
| CN112054478A (en) * | 2020-07-30 | 2020-12-08 | 广东史麦斯电器有限公司 | Power abnormity protection device of electric water heater |
| WO2025007945A1 (en) * | 2023-07-05 | 2025-01-09 | 艾欧史密斯(中国)热水器有限公司 | Heating system fault prediction method and apparatus, and electric water heater |
-
2017
- 2017-05-31 CN CN201720622738.0U patent/CN206831847U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108981181A (en) * | 2017-05-31 | 2018-12-11 | 芜湖美的厨卫电器制造有限公司 | Electric heater and its heating control apparatus and method |
| CN108981181B (en) * | 2017-05-31 | 2023-10-31 | 芜湖美的厨卫电器制造有限公司 | Electric water heater and heating control device and method thereof |
| CN109683049A (en) * | 2018-12-19 | 2019-04-26 | 珠海蓉胜电子材料研究院有限公司 | A kind of pair of heater circuit carries out method, computer installation and the computer readable storage medium of fault detection |
| CN109683049B (en) * | 2018-12-19 | 2021-03-19 | 珠海蓉胜电子材料研究院有限公司 | A method, computer device and computer-readable storage medium for fault detection of an electrothermal circuit |
| CN112054478A (en) * | 2020-07-30 | 2020-12-08 | 广东史麦斯电器有限公司 | Power abnormity protection device of electric water heater |
| WO2025007945A1 (en) * | 2023-07-05 | 2025-01-09 | 艾欧史密斯(中国)热水器有限公司 | Heating system fault prediction method and apparatus, and electric water heater |
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Effective date of registration: 20230331 Address after: 241000 west side of 3 / F, No.5 office building, new energy and new materials gathering area, Fuzhou Road, Jiangbei District, Wuhu City, Anhui Province Patentee after: Wuhu Midea intelligent kitchen electricity Manufacturing Co.,Ltd. Address before: 241009 Wan Chun East Road, East Wuhu economic and Technological Development Zone, Wuhu, Anhui Patentee before: WUHU MIDEA KITCHEN AND BATH APPLIANCES MFG. Co.,Ltd. |
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