CN112260386B - Water heater and power supply switching device thereof - Google Patents
Water heater and power supply switching device thereof Download PDFInfo
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- CN112260386B CN112260386B CN201910663296.8A CN201910663296A CN112260386B CN 112260386 B CN112260386 B CN 112260386B CN 201910663296 A CN201910663296 A CN 201910663296A CN 112260386 B CN112260386 B CN 112260386B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The invention discloses a water heater and a power supply switching device thereof, wherein the device comprises: the switching circuit is used for switching the power supply of the gas water heater, wherein the power supply of the gas water heater comprises an external alternating current power supply and a standby power supply; the power failure detection circuit is connected with an external alternating current power supply and outputs a detection signal by detecting whether the external alternating current power supply is powered down; and the control circuit is connected with the power failure detection circuit and the switching circuit and controls the switching circuit according to the detection signal so as to supply power to the gas water heater through the external alternating current power supply when the external alternating current power supply is not powered down and supply power to the gas water heater through the standby power supply when the external alternating current power supply is powered down. Therefore, the power supply switching device of the water heater provided by the embodiment of the invention can be automatically switched into the standby power supply for supplying power when the external alternating current power supply is powered off, so that the normal work of the water heater is ensured, and the normal bathing of a user is further ensured.
Description
Technical Field
The invention relates to the technical field of domestic appliances, in particular to a water heater and a power supply switching device thereof.
Background
In the related art, the gas water heater generally adopts commercial power, namely an AC220V power supply, but the related art has the problems that in the bathing process of a user, after the commercial power is cut off, the gas water heater stops working immediately, so that the user can not bath normally, and meanwhile, tail gas of a combustion chamber can not be discharged normally, so that potential safety hazards exist.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the first objective of the present invention is to provide a power switching device for a water heater, so as to enable a user to bath normally when an external ac power supply fails, thereby improving the user experience.
A second object of the present invention is to provide a water heater.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a power switching device for a water heater, including: the switching circuit is used for switching a power supply of the gas water heater, wherein the power supply of the gas water heater comprises an external alternating current power supply and a standby power supply; the power failure detection circuit is connected with the external alternating current power supply and outputs a detection signal by detecting whether the external alternating current power supply is powered down or not; and the control circuit is connected with the power failure detection circuit and the switching circuit and controls the switching circuit according to the detection signal so as to supply power to the gas water heater through the external alternating current power supply when the external alternating current power supply is not powered down and supply power to the gas water heater through the standby power supply when the external alternating current power supply is powered down.
According to the power supply switching device of the water heater provided by the embodiment of the invention, the power supply of the gas water heater is switched through the switching circuit, wherein the power supply of the gas water heater comprises an external alternating current power supply and a standby power supply, the power failure detection circuit is connected with the external alternating current power supply, the power failure detection circuit outputs a detection signal by detecting whether the external alternating current power supply is in power failure, the control circuit is connected with the power failure detection circuit and the switching circuit, and controls the switching circuit according to the detection signal so as to supply power to the gas water heater through the external alternating current power supply when the external alternating current power supply is not in power failure and supply power to the gas water heater through the standby power supply when the external alternating current power supply is in power failure. Therefore, the power supply switching device of the water heater provided by the embodiment of the invention can be automatically switched into the standby power supply for supplying power when the external alternating current power supply is powered off, so that the normal work of the gas water heater and the normal exhaust of tail gas are ensured, a user can be ensured to normally bath, and the use experience of the user is improved.
According to one embodiment of the invention, the power down detection circuit comprises: one end of the first resistor is connected with the first end of the external alternating current power supply; the anode of the first diode is connected with the other end of the first resistor; a cathode of the second diode is connected with a cathode of the first diode, and an anode of the second diode is connected with a second end of the external alternating current power supply; the first end of the optical coupler is connected with the cathode of the second diode and the cathode of the first diode, the second end of the optical coupler is connected with the second end of the external alternating current power supply, the third end of the optical coupler is connected with the control circuit, and the fourth end of the optical coupler is grounded.
According to one embodiment of the invention, the control circuit comprises: the input unit is connected with the power failure detection circuit; a reference unit providing a reference voltage; the first input end of the comparison unit is connected with the input unit, and the second input end of the comparison unit is connected with the reference unit; the control end of the switch unit is connected with the output end of the comparison unit, the first end of the switch unit is connected with a first direct current power supply, and the second end of the switch unit is connected with the switching circuit.
According to an embodiment of the present invention, the input unit includes: one end of the first capacitor is connected with the first input end of the comparison unit, and the other end of the first capacitor is grounded; a first end of the charging loop is connected with the first direct current power supply, and a second end of the charging loop is connected with one end of the first capacitor; a first end of the discharge loop is connected with one end of the first capacitor, and a second end of the discharge loop is grounded; a charge control subunit connected between the first end of the charging loop and the first direct current power supply.
According to one embodiment of the invention, the charging circuit comprises: the anode of the third diode is connected with the charging control subunit; and one end of the third resistor is connected with the cathode of the third diode, and the other end of the third resistor is connected with one end of the first capacitor.
According to an embodiment of the present invention, the discharging circuit and the charging circuit share the third resistor, the discharging circuit further includes a fourth resistor, one end of the fourth resistor is connected to one end of the third resistor, and the other end of the fourth resistor is grounded.
According to an embodiment of the present invention, the charge control subunit includes: one end of the fifth resistor is connected with the first direct current power supply; the sixth resistor is connected with the other end of the fifth resistor, and the other end of the sixth resistor is connected with the power failure detection circuit; the control end of the first switch tube is connected with the other end of the fifth resistor, the first end of the first switch tube is connected with the first direct current power supply, and the second end of the first switch tube is connected with the first end of the charging loop.
According to one embodiment of the invention, the reference unit comprises: one end of the second capacitor is connected with the second input end of the comparison unit, and the other end of the second capacitor is grounded; one end of the seventh resistor is connected with the first direct-current power supply, and the other end of the seventh resistor is connected with one end of the second capacitor; and one end of the eighth resistor is connected with the other end of the seventh resistor, and the other end of the eighth resistor is grounded.
According to one embodiment of the present invention, the switching unit includes: one end of the ninth resistor is connected with the output end of the comparison unit; one end of the tenth resistor is connected with the other end of the ninth resistor, and the other end of the tenth resistor is connected with the first direct-current power supply; and the control end of the second switch tube is connected with one end of the tenth resistor, the first end of the second switch tube is connected with the first direct-current power supply, and the second end of the second switch tube is connected with the switching circuit.
According to an embodiment of the present invention, the first direct current power supply is provided by the backup power supply, the power supply switching device further includes a backup power supply detection circuit connected between the first terminal of the switching unit and the first direct current power supply, wherein the backup power supply detection circuit includes: a first end of the third switching tube is connected with the first direct current power supply, and a second end of the third switching tube is connected with the first end of the switching unit; one end of the eleventh resistor is connected with the first direct-current power supply, and the other end of the eleventh resistor is connected with the control end of the third switching tube; a twelfth resistor, one end of which is connected with the other end of the eleventh resistor; and the cathode of the voltage-stabilizing tube is connected with the other end of the twelfth resistor, and the anode of the voltage-stabilizing tube is grounded.
According to an embodiment of the present invention, the switching circuit includes: the public end of a single-pole double-throw switch in the single-pole double-throw relay is connected with the power supply input end of the water heater, the first end of the single-pole double-throw switch in the single-pole double-throw relay is connected with the standby power supply, the second end of the single-pole double-throw switch in the single-pole double-throw relay is connected with a power supply conversion module of the water heater, the power supply conversion module is connected with the external alternating current power supply, one end of a coil in the single-pole double-throw relay is connected with the control circuit, and the other end of the coil in the single-pole double-throw relay is grounded; and the cathode of the fourth diode is connected with one end of the coil in the single-pole double-throw relay, and the anode of the fourth diode is connected with the other end of the coil in the single-pole double-throw relay.
According to an embodiment of the present invention, the power switching device of the water heater further includes a prompt circuit connected to the switching circuit, and the prompt circuit includes: the anode of the light-emitting diode is connected with one end of a coil in the single-pole double-throw relay; and one end of the second resistor is connected with the cathode of the light-emitting diode, and the other end of the second resistor is grounded.
In order to achieve the above object, a water heater according to an embodiment of the second aspect of the present invention is provided, which includes the power switching device of the water heater according to the embodiment of the first aspect of the present invention.
According to the water heater provided by the embodiment of the invention, the power supply switching device can automatically switch the external alternating current power supply into the standby power supply for supplying power when the external alternating current power supply is powered off, so that the normal work of the gas water heater and the normal exhaust of tail gas are ensured, and a user can normally take a bath.
Drawings
FIG. 1 is a block diagram of a power switching device of a water heater according to an embodiment of the invention;
FIG. 2 is a block diagram of a power switching device of a water heater according to one embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a power switching device of a 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 functions throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
A water heater and a power switching device thereof according to an embodiment of the present invention will be described with reference to the accompanying drawings.
Fig. 1 is a block diagram of a power switching device of a water heater according to an embodiment of the invention. As shown in fig. 1, the power switching device of a water heater according to an embodiment of the present invention includes a switching circuit 10, a power failure detection circuit 20, and a control circuit 30.
The switching circuit 10 is used for switching a power supply of the gas water heater, wherein the power supply of the gas water heater comprises an external alternating current power supply VSS and a standby power supply VSS1; the power failure detection circuit 20 is connected with an external alternating current power supply VSS, and the power failure detection circuit 20 outputs a detection signal by detecting whether the external alternating current power supply VSS is powered down or not; the control circuit 30 is connected with the power failure detection circuit 20 and the switching circuit 10, and the control circuit 30 controls the switching circuit 10 according to the detection signal, so that the external alternating current power supply VSS supplies power to the gas water heater through the external alternating current power supply VSS when the external alternating current power supply VSS is not powered down, and supplies power to the gas water heater through the standby power supply VSS1 when the external alternating current power supply VSS is powered down.
It should be noted that the external AC power source VSS may be AC220V commercial power, the backup power source VSS1 may be a battery, and the backup power source VSS1 may provide the dc power required for the normal operation of the gas water heater.
It can be understood that when the power failure detection circuit 20 detects that the external ac power supply VSS is not powered down, the control circuit 30 controls the switching circuit 10 to continue to supply power to the gas water heater through the external ac power supply VSS, and when the power failure detection circuit 20 detects that the external ac power supply VSS is powered down, the control circuit 30 controls the switching circuit 10 to supply power to the gas water heater through the backup power supply VSS 1.
Therefore, the power supply switching device of the water heater provided by the embodiment of the invention can automatically switch the external alternating current power supply VSS into the standby power supply VSS1 for power supply when the external alternating current power supply VSS is powered off, so that the normal work of the gas water heater and the normal exhaust of tail gas are ensured, a user can be ensured to normally bath, and the use experience of the user is improved.
Specifically, according to an embodiment of the present invention, as shown in fig. 3, the power down detection circuit 20 includes: the circuit comprises a first resistor R1, a first diode D1, a second diode D2 and an optical coupler IC2, wherein one end of the first resistor R1 is connected with a first end VSS-L of an external alternating current power supply VSS; the anode of the first diode D1 is connected with the other end of the first resistor R1; the cathode of the second diode D2 is connected with the cathode of the first diode D1, and the anode of the second diode D2 is connected with the second end VSS-N of the external alternating current power supply VSS; the first end of the optical coupler IC2 is connected with the cathode of the second diode D2 and the cathode of the first diode D1, the second end of the optical coupler IC2 is connected with the second end VSS-N of an external alternating current power supply VSS, the third end of the optical coupler IC2 is connected with the control circuit 30, and the fourth end of the optical coupler IC2 is grounded.
It should be noted that the optical coupler IC2 may include a light emitting diode and a phototransistor, and the power failure detection circuit 20 and the control circuit 30 may be electrically isolated from each other by the optical coupler IC 2.
It is understood that the external AC power source VSS may be AC220V commercial power, the AC220V commercial power may be a sine wave voltage with a frequency of 50Hz, and when the first terminal VSS-L of the external AC power source VSS outputs a positive half cycle voltage, the light emitting diode in the optical coupler IC2 emits light, so that the phototransistor in the optical coupler IC2 is turned on.
Further, according to an embodiment of the present invention, as shown in fig. 2, the control circuit 30 includes: the power failure detection circuit comprises an input unit 31, a reference unit 32, a comparison unit 33 and a switch unit 34, wherein the input unit 31 is connected with the power failure detection circuit 20; the reference unit 32 is used to provide a reference voltage; a first input of the comparison unit 33 is connected to the input unit 31, a second input of the comparison unit 33 is connected to the reference unit 32; a control terminal of the switching unit 34 is connected to the output terminal of the comparing unit 33, a first terminal of the switching unit 34 is connected to the first dc power source DVSS, and a second terminal of the switching unit 34 is connected to the switching circuit 10.
The first dc power source DVSS is provided by the backup power source VSS1, the first dc power source DVSS may be, for example, 12V dc power, and the comparing unit 33 may be a comparator.
Specifically, according to an embodiment of the present invention, as shown in fig. 3, the input unit 31 includes: the charging circuit comprises a first capacitor C1, a charging loop 310, a discharging loop 311 and a charging control subunit 312, wherein one end of the first capacitor C1 is connected with a first input end of the comparing unit 33, and the other end of the first capacitor C1 is grounded; a first end of the charging loop 310 is connected to the first dc power source DVSS, and a second end of the charging loop 310 is connected to one end of the first capacitor C1; a first end of the discharging loop 311 is connected with one end of the first capacitor C1, and a second end of the discharging loop 311 is grounded; the charging control subunit 312 is connected between the first end of the charging loop 310 and the first direct current power source DVSS.
More specifically, according to an embodiment of the present invention, as shown in fig. 3, the charging circuit 310 includes: a third diode D3 and a third resistor R3, an anode of the third diode D3 is connected to the charge control subunit 312; one end of the third resistor R3 is connected to the cathode of the third diode D3, and the other end of the third resistor R3 is connected to one end of the first capacitor C1.
Further, according to an embodiment of the present invention, as shown in fig. 3, the discharging loop 311 shares the third resistor R3 with the charging loop 310, the discharging loop 311 further includes a fourth resistor R4, one end of the fourth resistor R4 is connected to one end of the third resistor R3, and the other end of the fourth resistor R4 is grounded.
Further, according to an embodiment of the present invention, as shown in fig. 3, the charging control subunit 312 includes: a fifth resistor R5, a sixth resistor R6 and a first switching tube Q1, wherein one end of the fifth resistor R5 is connected with a first direct current power supply DVSS; the sixth resistor R6 is connected with the other end of the fifth resistor R5, and the other end of the sixth resistor R6 is connected with the power failure detection circuit 20; the control end of the first switching tube Q1 is connected to the other end of the fifth resistor R5, the first end of the first switching tube Q1 is connected to the first dc power DVSS, and the second end of the first switching tube Q1 is connected to the first end of the charging loop 310.
Specifically, according to an embodiment of the present invention, as shown in fig. 3, the reference unit 32 includes: a second capacitor C2, a seventh resistor R7 and an eighth resistor R8, wherein one end of the second capacitor C2 is connected to the second input terminal of the comparing unit 33, and the other end of the second capacitor C2 is grounded; one end of the seventh resistor R7 is connected to the first dc power source DVSS, and the other end of the seventh resistor R7 is connected to one end of the second capacitor C2; one end of the eighth resistor R8 is connected to the other end of the seventh resistor R7, and the other end of the eighth resistor R8 is grounded.
Further, according to an embodiment of the present invention, as shown in fig. 3, the switching unit 34 includes: a ninth resistor R9, a tenth resistor R10 and a second switch tube Q2, wherein one end of the ninth resistor R9 is connected with the output end of the comparison unit 33; one end of a tenth resistor R10 is connected to the other end of the ninth resistor R9, and the other end of the tenth resistor R10 is connected to the first dc power supply DVSS; a control end of the second switching tube Q2 is connected to one end of the tenth resistor R10, a first end of the second switching tube Q2 is connected to the first dc power DVSS, and a second end of the second switching tube Q2 is connected to the switching circuit 10.
It can be understood that when the external ac power source VSS is normally powered, that is, the power is not turned off, and the first terminal VSS-L of the external ac power source VSS outputs a positive half-cycle voltage, the light emitting diode in the optocoupler IC2 emits light, the phototriode in the optocoupler IC2 is turned on, so that the first switching tube Q1 is turned on, the first dc power source DVSS charges the first capacitor C1 through the first switching tube Q1, the third diode D3, and the third resistor R3, and when the voltage of the first capacitor C1 is charged to the reference voltage, the output terminal of the comparing unit 33 outputs a high level, so that the second switching tube Q2 is turned off.
When the external alternating current power supply VSS normally supplies power, that is, the power is not lost, and the first terminal VSS-L of the external alternating current power supply VSS outputs negative half-cycle voltage, the optocoupler IC2 does not work, so that the first switching tube Q1 is turned off, the first capacitor C1 starts to discharge through the third resistor R3 and the fourth resistor R4, it needs to be noted that at this time, the first capacitor C1 discharges less, the voltage of the first capacitor C1 is still higher than the reference voltage, the output end of the comparison unit 33 still outputs high level, and the second switching tube Q2 is turned off.
After an external alternating current power supply VSS is powered off, the optocoupler IC2 does not work, so that the first switch tube Q1 is turned off, the first capacitor C1 starts to discharge to a voltage lower than a reference voltage through the third resistor R3 and the fourth resistor R4, the output end of the comparison unit 33 outputs a low level, and the second switch tube Q2 is turned on.
Further, according to an embodiment of the present invention, as shown in fig. 2 to 3, the power switching apparatus further includes a standby power detecting circuit 40, the standby power detecting circuit 40 is connected between the first terminal of the switch unit 34 and the first direct current power DVSS, wherein the standby power detecting circuit 40 includes: a third switch tube Q3, an eleventh resistor R11, a twelfth resistor R12 and a voltage regulator tube ZD1, wherein a first end of the third switch tube Q3 is connected to a first dc power source DVSS, and a second end of the third switch tube Q3 is connected to a first end of a switch unit 34; one end of the eleventh resistor R11 is connected to the first dc power source DVSS, and the other end of the eleventh resistor R11 is connected to the control end of the third switching tube Q3; one end of the twelfth resistor R12 is connected with the other end of the eleventh resistor R11; the cathode of the voltage-regulator tube ZD1 is connected with the other end of the twelfth resistor R12, and the anode of the voltage-regulator tube ZD1 is grounded. Wherein, the voltage stabilizing value of the voltage stabilizing tube ZD1 can be 10.5V.
It can be understood that after the external ac power source VSS is powered down, the optocoupler IC2 does not operate, the first switch tube Q1 is turned off, the first capacitor C1 starts to discharge to a voltage lower than the reference voltage through the third resistor R3 and the fourth resistor R4, the output end of the comparison unit 33 outputs a low level, the second switch tube Q2 is turned on, at this time, when the voltage of the first dc power source DVSS is greater than 10.5V, the voltage regulator tube ZD1 is turned on, the third switch tube Q3 is turned on, and the single-pole double-throw relay RL1 can normally pull in, however, when the voltage of the first dc power source DVSS is less than 10.5V, the voltage regulator tube ZD1 is turned off, the third switch tube Q3 is turned off, and the single-pole double-throw relay RL1 cannot normally pull in.
Therefore, after the external alternating current power supply VSS is powered off and the standby power supply VSS1 is low in voltage, the power supply of the gas water heater can be automatically cut off so as to prevent the standby power supply VSS1 from feeding power.
Further, according to an embodiment of the present invention, as shown in fig. 3, the switching circuit 10 includes: the water heater comprises a single-pole double-throw relay RL1 and a fourth diode D4, wherein the common end of a single-pole double-throw switch in the single-pole double-throw relay RL1 is connected with a power supply input end VIN of the water heater, the first end of the single-pole double-throw switch in the single-pole double-throw relay RL1 is connected with a standby power supply VSS1, the second end of the single-pole double-throw switch in the single-pole double-throw relay RL1 is connected with a power supply conversion module 50 of the water heater, the power supply conversion module 50 is connected with an external alternating current power supply VSS, one end of a coil in the single-pole double-throw relay RL1 is connected with a control circuit 30, and the other end of the coil in the single-pole double-throw relay RL1 is grounded; the cathode of the fourth diode D4 is connected to one end of the coil in the single-pole double-throw relay RL1, and the anode of the fourth diode D4 is connected to the other end of the coil in the single-pole double-throw relay RL 1.
It should be noted that the power conversion module 50 may be an AC/DC switching power supply, and is configured to convert AC power provided by the external AC power supply VSS into DC power required by the gas water heater to normally operate.
It can be understood that when the external ac power source VSS is normally powered, that is, the external ac power source VSS is not powered down, and the first terminal VSS-L of the external ac power source VSS outputs a positive half-cycle voltage, the light emitting diode in the opto-coupler IC2 emits light, the phototransistor in the opto-coupler IC2 is turned on, the first switch tube Q1 is turned on, so that the first dc power source DVSS charges the first capacitor C1 through the first switch tube Q1, the third diode D3 and the third resistor R3, when the voltage of the first capacitor C1 is charged to the reference voltage, the output terminal of the comparing unit 33 outputs a high level, so that the second switch tube Q2 is turned off, the single-pole double-throw relay RL1 is not actuated, the common terminal of the single-pole double-throw switch in the single-pole double-throw relay RL1 is connected to the second terminal of the single-pole double-throw switch in the single-pole double-throw relay RL1, and the ac power provided by the external ac power source VSS is converted into a dc power by the power conversion module 50 to supply the gas water heater, so that the electric quantity of the backup power source VSS1 is not consumed.
When the external alternating current power supply VSS normally supplies power, that is, the power is not turned off, and the first end VSS-L of the external alternating current power supply VSS outputs a negative half-cycle voltage, the optocoupler IC2 does not operate, so that the first switching tube Q1 is turned off, the first capacitor C1 starts to discharge through the third resistor R3 and the fourth resistor R4, it should be noted that, at this time, the first capacitor C1 discharges less, the voltage of the first capacitor C1 is still higher than the reference voltage, the output end of the comparing unit 33 still outputs a high level, so that the second switching tube Q2 is turned off, the single-pole double-throw relay RL1 does not attract, the common end of the single-pole double-throw switch in the single-pole double-throw relay RL1 is connected with the second end of the single-pole double-throw switch in the single-pole double-throw relay RL1, and the alternating current provided by the external alternating current power supply VSS is converted into direct current by the power supply conversion module 50 to supply the gas water heater, so that the electric quantity of the standby power supply VSS1 does not need to be consumed.
After an external alternating current power supply VSS is powered off, the optical coupler IC2 does not work, the first switch tube Q1 is turned off, the first capacitor C1 starts to discharge to a voltage lower than a reference voltage through the third resistor R3 and the fourth resistor R4, the output end of the comparison unit 33 outputs a low level, the second switch tube Q2 is turned on, at the moment, when the voltage of the first direct current power supply DVSS is larger than 10.5V, the voltage regulator tube ZD1 is turned on, the third switch tube Q3 is turned on, the single-pole double-throw relay RL1 is attracted, the common end of the single-pole double-throw switch in the single-pole double-throw relay RL1 is connected with the first end of the single-pole double-throw switch in the single-pole double-throw relay RL1, and the standby power supply VSS1 starts to supply power for the gas water heater. Therefore, after the external alternating current power supply VSS is powered off and the power quantity of the standby power supply VSS1 is sufficient, the power supply can be automatically switched to the standby power supply VSS1 for power supply.
Further, according to an embodiment of the present invention, as shown in fig. 2 to 3, the power switching device of the water heater further includes a prompting circuit 60, the prompting circuit 60 is connected to the switching circuit 10, and the prompting circuit 60 includes: the circuit comprises a light-emitting diode LED1 and a second resistor R2, wherein the anode of the light-emitting diode LED1 is connected with one end of a coil in a single-pole double-throw relay RL 1; one end of the second resistor R2 is connected to the cathode of the light emitting diode LED1, and the other end of the second resistor R2 is grounded.
It can be understood that after the external alternating current power supply VSS is powered down, the optocoupler IC2 does not operate, the first switch tube Q1 is turned off, the first capacitor C1 starts to discharge to a voltage lower than the reference voltage through the third resistor R3 and the fourth resistor R4, the output end of the comparison unit 33 outputs a low level, the second switch tube Q2 is turned on, at this time, when the voltage of the first direct current power supply DVSS is greater than 10.5V, the voltage regulator tube ZD1 is turned on, the third switch tube Q3 is turned on, the single-pole double-throw relay RL1 is attracted, and the light emitting diode LED1 emits light to prompt the standby power supply VSS1 to supply power to the gas water heater when working.
In summary, according to the power supply switching device of the water heater provided by the embodiment of the invention, the power supply of the gas water heater is switched through the switching circuit, wherein the power supply of the gas water heater includes the external ac power supply and the backup power supply, the power failure detection circuit is connected with the external ac power supply, the power failure detection circuit outputs the detection signal by detecting whether the external ac power supply is powered down, the control circuit is connected with the power failure detection circuit and the switching circuit, and the control circuit controls the switching circuit according to the detection signal, so that the external ac power supply supplies power to the gas water heater through the external ac power supply when the external ac power supply is not powered down, and the backup power supply supplies power to the gas water heater when the external ac power supply is powered down. Therefore, the power supply switching device of the water heater provided by the embodiment of the invention can be automatically switched into the standby power supply for supplying power when the external alternating current power supply is powered off, so that the normal work of the gas water heater and the normal exhaust of tail gas are ensured, a user can be ensured to normally bath, and the use experience of the user is improved.
Based on the power switching device of the water heater in the embodiment, the embodiment of the invention also provides the water heater, which comprises the power switching device of the water heater.
According to the water heater provided by the embodiment of the invention, the power supply switching device can automatically switch the external alternating current power supply into the standby power supply for supplying power when the external alternating current power supply is powered off, so that the normal work of the gas water heater and the normal exhaust of tail gas are ensured, and a user can normally take a bath.
In the description of the present invention, it is to be understood that the terms "central," "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 are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the 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," "secured," and the like are to be construed broadly and can, 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 meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. 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 above, 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 within the scope of the present invention.
Claims (11)
1. A power switching device for a water heater, comprising:
the switching circuit is used for switching a power supply of the water heater, wherein the power supply of the water heater comprises an external alternating current power supply and a standby power supply;
the power failure detection circuit is connected with the external alternating current power supply and outputs a detection signal by detecting whether the external alternating current power supply is powered down or not;
the control circuit is connected with the power failure detection circuit and the switching circuit and controls the switching circuit according to the detection signal so as to supply power to the water heater through the external alternating current power supply when the external alternating current power supply is not powered down and supply power to the water heater through the standby power supply when the external alternating current power supply is powered down;
the control circuit includes:
the input unit is connected with the power failure detection circuit;
a reference unit providing a reference voltage;
the first input end of the comparison unit is connected with the input unit, and the second input end of the comparison unit is connected with the reference unit;
the control end of the switch unit is connected with the output end of the comparison unit, the first end of the switch unit is connected with a first direct current power supply, and the second end of the switch unit is connected with the switching circuit;
the input unit includes:
one end of the first capacitor is connected with the first input end of the comparison unit, and the other end of the first capacitor is grounded;
a first end of the charging loop is connected with the first direct current power supply, and a second end of the charging loop is connected with one end of the first capacitor;
a first end of the discharge loop is connected with one end of the first capacitor, and a second end of the discharge loop is grounded;
a charge control subunit connected between the first end of the charging loop and the first direct current power supply.
2. The power switching device of a water heater of claim 1, wherein the power down detection circuit comprises:
one end of the first resistor is connected with the first end of the external alternating current power supply;
the anode of the first diode is connected with the other end of the first resistor;
a second diode, wherein a cathode of the second diode is connected with a cathode of the first diode, and an anode of the second diode is connected with a second end of the external alternating current power supply;
the first end of the optical coupler is connected with the cathode of the second diode and the cathode of the first diode, the second end of the optical coupler is connected with the second end of the external alternating current power supply, the third end of the optical coupler is connected with the control circuit, and the fourth end of the optical coupler is grounded.
3. The power switching device of a water heater of claim 1, wherein the charging circuit comprises:
the anode of the third diode is connected with the charging control subunit;
and one end of the third resistor is connected with the cathode of the third diode, and the other end of the third resistor is connected with one end of the first capacitor.
4. The power switching device of a water heater according to claim 3, wherein the discharging circuit and the charging circuit share the third resistor, the discharging circuit further comprises a fourth resistor, one end of the fourth resistor is connected to one end of the third resistor, and the other end of the fourth resistor is grounded.
5. The power switching device of a water heater of claim 3, wherein the charge control subunit comprises:
one end of the fifth resistor is connected with the first direct current power supply;
the sixth resistor is connected with the other end of the fifth resistor, and the other end of the sixth resistor is connected with the power failure detection circuit;
the control end of the first switch tube is connected with the other end of the fifth resistor, the first end of the first switch tube is connected with the first direct-current power supply, and the second end of the first switch tube is connected with the first end of the charging loop.
6. The power switching apparatus of a water heater according to claim 1, wherein the reference unit comprises:
one end of the second capacitor is connected with the second input end of the comparison unit, and the other end of the second capacitor is grounded;
one end of the seventh resistor is connected with the first direct-current power supply, and the other end of the seventh resistor is connected with one end of the second capacitor;
and one end of the eighth resistor is connected with the other end of the seventh resistor, and the other end of the eighth resistor is grounded.
7. The power switching apparatus of a water heater according to claim 1, wherein the switching unit comprises:
one end of the ninth resistor is connected with the output end of the comparison unit;
one end of the tenth resistor is connected with the other end of the ninth resistor, and the other end of the tenth resistor is connected with the first direct-current power supply;
and the control end of the second switch tube is connected with one end of the tenth resistor, the first end of the second switch tube is connected with the first direct-current power supply, and the second end of the second switch tube is connected with the switching circuit.
8. The power switching apparatus of a water heater according to claim 1, wherein the first direct current power is provided by the backup power, the power switching apparatus further comprising a backup power detecting circuit connected between the first terminal of the switching unit and the first direct current power, wherein the backup power detecting circuit comprises:
a first end of the third switching tube is connected with the first direct current power supply, and a second end of the third switching tube is connected with the first end of the switching unit;
one end of the eleventh resistor is connected with the first direct-current power supply, and the other end of the eleventh resistor is connected with the control end of the third switching tube;
a twelfth resistor, one end of which is connected with the other end of the eleventh resistor;
and the cathode of the voltage-stabilizing tube is connected with the other end of the twelfth resistor, and the anode of the voltage-stabilizing tube is grounded.
9. The power switching device of a water heater according to claim 1, wherein the switching circuit comprises:
the public end of a single-pole double-throw switch in the single-pole double-throw relay is connected with the power input end of the water heater, the first end of the single-pole double-throw switch in the single-pole double-throw relay is connected with the standby power supply, the second end of the single-pole double-throw switch in the single-pole double-throw relay is connected with the power conversion module of the water heater, the power conversion module is connected with the external alternating current power supply, one end of a coil in the single-pole double-throw relay is connected with the control circuit, and the other end of the coil in the single-pole double-throw relay is grounded;
and the cathode of the fourth diode is connected with one end of the coil in the single-pole double-throw relay, and the anode of the fourth diode is connected with the other end of the coil in the single-pole double-throw relay.
10. The power switching device of a water heater of claim 9, further comprising a prompt circuit connected to the switching circuit, the prompt circuit comprising:
the anode of the light-emitting diode is connected with one end of a coil in the single-pole double-throw relay;
and one end of the second resistor is connected with the cathode of the light-emitting diode, and the other end of the second resistor is grounded.
11. A water heater characterized by comprising a power switching device of the water heater according to any one of claims 1-10.
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| CN201910663296.8A CN112260386B (en) | 2019-07-22 | 2019-07-22 | Water heater and power supply switching device thereof |
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| CN201910663296.8A CN112260386B (en) | 2019-07-22 | 2019-07-22 | Water heater and power supply switching device thereof |
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| CN112260386B true CN112260386B (en) | 2023-03-21 |
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| CN102222972A (en) * | 2011-06-02 | 2011-10-19 | 迈普通信技术股份有限公司 | Switching circuit and power supply device |
| US20120068542A1 (en) * | 2010-09-21 | 2012-03-22 | Alappat Kuriappan P | Power supply |
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| CN109963395A (en) * | 2018-10-12 | 2019-07-02 | 青岛亿联客信息技术有限公司 | A kind of control device |
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| US20120068542A1 (en) * | 2010-09-21 | 2012-03-22 | Alappat Kuriappan P | Power supply |
| CN102222972A (en) * | 2011-06-02 | 2011-10-19 | 迈普通信技术股份有限公司 | Switching circuit and power supply device |
| CN207382047U (en) * | 2017-10-17 | 2018-05-18 | 河北师范大学 | Detection of power loss and main power supply switching system in intelligent domestic system |
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