CN111121304B

CN111121304B - Water heater and control method thereof

Info

Publication number: CN111121304B
Application number: CN201911399083.5A
Authority: CN
Inventors: 张洪; 石泽发; 涂小平; 彭永和
Original assignee: Sichuan Hongmei Intelligent Technology Co Ltd
Current assignee: Sichuan Hongmei Intelligent Technology Co Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2021-04-23
Anticipated expiration: 2039-12-30
Also published as: CN111121304A

Abstract

The invention provides a water heater and a control method thereof, wherein the water heater comprises a control module, an acquisition module, a sectional valve driving module, a proportional valve driving module and a stop valve driving module; the acquisition module is used for acquiring the water inlet flow, the water inlet temperature and the water outlet temperature of the water heater and sending the water inlet flow, the water inlet temperature and the water outlet temperature to the control module; the control module is used for determining a first gas flow according to a preset target temperature, a preset water inlet flow, a preset water inlet temperature and a preset water outlet temperature, and sending a corresponding PWM (pulse width modulation) driving signal to the sectional valve driving module so as to control the sectional valve; determining the flow of the second fuel according to the outlet water temperature and the target temperature, and sending a corresponding PWM (pulse-width modulation) driving signal to a proportional valve driving module so as to control a proportional valve according to the corresponding PWM driving signal; when the water heater is opened, a PWM driving signal for controlling the opening of the stop valve is sent to the stop valve driving module so that the stop valve is controlled according to the PWM driving signal. The scheme can flexibly realize constant temperature control.

Description

Water heater and control method thereof

Technical Field

The invention relates to the technical field of computers, in particular to a water heater and a control method thereof.

Background

With the rapid development of science and technology, various water heaters are more and more widely applied, and how to realize constant temperature of the water heater is also more and more emphasized.

The existing constant temperature gas water heater adopts a proportional valve type temperature control principle, a flow sensor is connected in a pipeline in series, and the flow sensor converts a water flow signal into a corresponding electric signal and inputs the signal into a controller. The controller adjusts the opening of the air valve according to the strength or frequency of the input signal, so that the gas flow and the water flow are changed in direct proportion, and the aim of keeping the water temperature constant is fulfilled.

As can be seen from the above description, the existing constant temperature water heater realizes constant water temperature by the proportional valve type temperature control principle. When the ambient temperature is greatly changed, the constant temperature control cannot be conveniently realized, and the flexibility is poor.

The prior art also discloses the following patent application documents:

chinese patent application No. CN109595787A discloses a constant temperature water heater with automatic temperature drift calibration and an automatic calibration control method thereof, which mainly realize constant temperature through software control.

Chinese patent application No. CN208968033U discloses a high capacity constant temperature water heater, the whole water heater includes mechanical parts.

Chinese patent application No. CN2165380Y discloses a full-automatic thermostatic water heater control device, which is mainly a whole thermostatic control part, and includes a switching power supply part, an electromagnetic valve control part, an ignition valve and a control part thereof.

Disclosure of Invention

The embodiment of the invention provides a water heater and a control method thereof, and the water heater and the control method thereof have better flexibility.

In a first aspect, the present invention provides a water heater comprising:

the control module, the acquisition module, the segment valve driving module, the proportional valve driving module and the stop valve driving module;

the control module is respectively connected with the acquisition module, the section valve driving module, the proportional valve driving module and the stop valve driving module;

the acquisition module is used for acquiring the water inlet flow, the water inlet temperature and the water outlet temperature of the water heater and sending the water inlet flow, the water inlet temperature and the water outlet temperature to the control module;

the control module is used for determining a first gas flow according to a preset target temperature, the water inlet flow, the water inlet temperature and the water outlet temperature, and sending a first PWM (pulse width modulation) driving signal corresponding to the first gas flow to the segment valve driving module; determining a second fuel flow according to the outlet water temperature and the target temperature, and sending a second PWM driving signal corresponding to the second fuel flow to the proportional valve driving module; when the water heater is started, a third PWM driving signal for controlling the opening of a stop valve is sent to the stop valve driving module;

the section valve driving module is used for controlling an external section valve according to the first PWM driving signal;

the proportional valve driving module is used for controlling an external proportional valve according to the second PWM driving signal;

and the stop valve driving module is used for controlling the opening of an external stop valve according to the third PWM driving signal.

Preferably, the first and second electrodes are formed of a metal,

the collection module comprises: an influent water temperature sensor circuit;

the water inlet temperature sensor circuit is used for detecting the water inlet temperature, converting the water inlet temperature into an electric signal and transmitting the electric signal to the control module;

the temperature sensor circuit of intaking includes: the temperature sensor comprises a first temperature sensor, a first resistor, a second resistor and a first capacitor;

the first end of the first temperature sensor is grounded, and the second end of the first temperature sensor is connected with the first end of the first resistor;

the second end of the first resistor is connected with the control module;

the first end of the second resistor is externally connected with a first direct-current voltage, and the second end of the second resistor is connected with the first end of the first resistor;

the first end of the first capacitor is connected with the second end of the first resistor, and the second end of the first capacitor is grounded.

Preferably, the first and second electrodes are formed of a metal,

the collection module comprises: a water outlet temperature sensor circuit;

the outlet water temperature sensor circuit is used for detecting the outlet water temperature, converting the outlet water temperature into an electric signal and transmitting the electric signal to the control module;

the outlet water temperature sensor circuit comprises: the temperature sensor comprises a second temperature sensor, a third resistor, a fourth resistor and a second capacitor;

the first end of the second temperature sensor is grounded, and the second end of the second temperature sensor is connected with the first end of the third resistor;

the second end of the third resistor is connected with the control module;

the first end of the fourth resistor is externally connected with a first direct-current voltage, and the second end of the fourth resistor is connected with the first end of the third resistor;

and the first end of the second capacitor is connected with the second end of the third resistor, and the second end of the second capacitor is grounded.

Preferably, the first and second electrodes are formed of a metal,

the segment valve drive module comprising: the first N-MOS tube, the first fast recovery diode, the seventh resistor and the eighth resistor are connected in series;

a first end of the fifth resistor is connected with a third pin of the control module, and a second end of the fifth resistor is connected with a first end of the first electrolytic capacitor;

the first end of the first electrolytic capacitor is connected with the second end of the sixth resistor, and the second end of the first electrolytic capacitor is connected with the first end of the sixth resistor;

the second end of the sixth resistor is connected with the grid electrode of the first N-MOS tube;

the source electrode of the first N-MOS tube is grounded, and the drain electrode of the first N-MOS tube is connected with the anode of the first fast recovery diode;

the anode of the first fast recovery diode is connected with the second end of the seventh resistor, the cathode of the first fast recovery diode is connected with the input end of the segment valve, and the cathode of the first fast recovery diode is also externally connected with a second direct-current voltage;

the first end of the seventh resistor is connected with the control module, and the second end of the seventh resistor is connected with the output end of the segment valve;

and the first end of the eighth resistor is connected with the second end of the sixth resistor, and the second end of the eighth resistor is grounded.

Preferably, the first and second electrodes are formed of a metal,

the proportional valve drive module includes: the second N-MOS tube, the second fast recovery diode, the ninth resistor, the tenth resistor and the eleventh resistor;

the grid electrode of the second N-MOS tube is connected with the control module, the source electrode of the second N-MOS tube is connected with the first end of the eleventh resistor, and the drain electrode of the second N-MOS tube is connected with the output end of the proportional valve;

the anode of the second fast recovery diode is connected with the drain electrode of the second N-MOS tube, the cathode of the second fast recovery diode is connected with the input end of the proportional valve, and the cathode of the second fast recovery diode is also externally connected with a second direct-current voltage;

the first end of the ninth resistor is connected with the grid electrode of the second N-MOS tube, and the second end of the ninth resistor is grounded;

a first end of the tenth resistor is connected with a first end of the eleventh resistor, and a second end of the tenth resistor is grounded;

the first end of the eleventh resistor is connected with the grid electrode of the second N-MOS tube, and the second end of the eleventh resistor is grounded.

Preferably, the first and second electrodes are formed of a metal,

the shut-off valve drive module comprising: a twelfth resistor, a second electrolytic capacitor, a thirteenth resistor, a third N-MOS tube, a third fast recovery diode, a fourteenth resistor and a fifteenth resistor;

the first end of the twelfth resistor is connected with the control module, and the second end of the twelfth resistor is connected with the first end of the second electrolytic capacitor;

the second end of the second electrolytic capacitor is connected with the first end of the thirteenth resistor;

the second end of the thirteenth resistor is connected with the grid electrode of the third MOS tube;

the source electrode of the third N-MOS tube is grounded, and the drain electrode of the third N-MOS tube is connected with the second end of the fourteenth resistor;

the anode of the third fast recovery diode is connected with the second end of the fourteenth resistor, the cathode of the third fast recovery diode is connected with the input end of the stop valve, and the cathode of the third fast recovery diode is further externally connected with a second direct-current voltage;

a first end of the fourteenth resistor is connected with a fourth pin of the control module, and a second end of the fourteenth resistor is connected with an output end of the stop valve;

a first end of the fifteenth resistor is connected with a second end of the thirteenth resistor, and a second end of the fifteenth resistor is grounded.

Preferably, the first and second electrodes are formed of a metal,

further comprising: a first feedback circuit;

the first feedback circuit is used for detecting the running state of the stop valve and the running state of the segment valve, converting the detected running state of the stop valve and the detected running state of the segment valve into a first feedback electric signal, and feeding the first feedback electric signal back to the control module;

the control module is used for receiving and processing the first feedback electric signal;

the first feedback circuit includes: a sixteenth resistor, a first triode, a seventeenth resistor and an eighteenth resistor;

a first end of the sixteenth resistor is connected with a collector of the first triode, and a second end of the sixteenth resistor is connected with the control module;

the emitting electrode of the first triode is grounded, and the base electrode of the first triode is connected with the first end of the eighteenth resistor;

a first end of the seventeenth resistor is externally connected with a first direct-current voltage, and a second end of the seventeenth resistor is connected with a first end of the sixteenth resistor;

and the first end of the eighteenth resistor is respectively connected with the stop valve driving module and the segment valve driving module, and the second end of the eighteenth resistor is grounded.

Preferably, the first and second electrodes are formed of a metal,

further comprising: a second feedback circuit;

the second feedback circuit is used for detecting the operation state of the proportional valve, converting the detected operation state of the proportional valve into a second feedback electric signal and feeding the second feedback electric signal back to the control module;

the control module is used for receiving and processing the second feedback electric signal;

the second feedback circuit includes: a nineteenth resistor, a twentieth resistor, a comparator, a third capacitor, a fourth capacitor, a twenty-first resistor and a twenty-second resistor;

the first end of the nineteenth resistor is connected with the control module, and the second end of the nineteenth resistor is connected with the positive input end of the comparator;

the first end of the twentieth resistor is connected with the first end of the proportional valve driving module, and the second end of the twentieth resistor is connected with the reverse input end of the comparator;

the reverse input end of the comparator is connected with the first end of the fourth capacitor, and the reverse input end of the comparator is connected with the second end of the third capacitor;

a first end of the third capacitor is connected with a second end of the twenty-first resistor, and a second end of the third capacitor is connected with a second end of the nineteenth resistor;

a first end of the fourth capacitor is connected with a second end of the twentieth resistor, and a second end of the fourth capacitor is grounded;

a first end of the twenty-first resistor is grounded, and a second end of the twenty-first resistor is connected with a second end of the third capacitor;

the first end of the second twenty-second resistor is externally connected with a first direct-current voltage, the first end of the second twenty-second resistor is further connected with the output end of the comparator, and the second end of the second twenty-second resistor is connected with the second end of the proportional valve driving module.

Preferably, the first and second electrodes are formed of a metal,

further comprising: a direct current voltage input circuit;

the direct-current voltage input circuit is used for providing electric energy for the stop valve driving circuit, the segment valve driving circuit, the proportional valve driving circuit and the control module;

the direct-current voltage input circuit includes: a power supply unit, a fifth capacitor, a sixth capacitor, a third electrolytic capacitor, and a fourth electrolytic capacitor;

the first end of the power supply part is externally connected with a first direct current voltage, the second end of the power supply part is externally connected with a second direct current voltage, and the third end of the power supply part is grounded;

the first end of the fifth capacitor is connected with the first end of the power supply part, and the second end of the fifth capacitor is connected with the first end of the sixth capacitor;

the second end of the sixth capacitor is connected with the second end of the power supply part;

the first end of the third electrolytic capacitor is connected with the first end of the fifth capacitor, and the second end of the third electrolytic capacitor is grounded;

and the first end of the fourth electrolytic capacitor is connected with the second end of the third electrolytic capacitor, and the second end of the third electrolytic capacitor is connected with the second end of the power supply part.

In a second aspect, an embodiment of the present invention provides a control method for a water heater according to any one of the first aspects, including:

the water inlet flow, the water inlet temperature and the water outlet temperature of the water heater are collected through a collection module, and the water inlet flow, the water inlet temperature and the water outlet temperature are sent to a control module;

determining a first gas flow according to a preset target temperature, the water inlet flow, the water inlet temperature and the water outlet temperature through the control module, sending a first PWM (pulse-width modulation) driving signal corresponding to the first gas flow to a sectional valve driving module, determining a second gas flow according to the water outlet temperature and the target temperature, sending a second PWM driving signal corresponding to the second gas flow to a proportional valve driving module, and sending a third PWM driving signal for controlling the opening of a stop valve to a stop valve driving module when the water heater is started;

controlling a segment valve according to the first PWM driving signal through the segment valve driving module;

controlling, by the proportional valve drive module, a proportional valve according to the second PWM drive signal;

and controlling the stop valve to be opened through the stop valve driving module according to the third PWM driving signal.

The embodiment of the invention provides a water heater and a control method thereof. The control module determines a first gas flow according to a target temperature, a water inlet flow, a water inlet temperature and a water outlet temperature preset by a user, sends a first PWM (pulse width modulation) driving signal corresponding to the first gas flow to the sectional valve driving module, and the sectional valve driving module controls the sectional valve according to the first PWM driving signal. The control module determines a second fuel flow according to the outlet water temperature and the target temperature, and sends a second PWM driving signal corresponding to the second fuel flow to the proportional valve driving module, and the proportional valve driving module controls the proportional valve according to the second PWM driving signal. When the water heater is started, the control module sends a third PWM driving signal for controlling the stop valve to be opened to the stop valve driving module, and the stop valve driving module controls the stop valve to be opened in the running process of the water heater according to the third PWM driving signal. Through the linkage of the stop valve, the segment valve and the proportional valve, the thermostatic control is flexibly realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of a water heater provided by an embodiment of the present invention;

FIG. 2 is a schematic view of another water heater provided by an embodiment of the present invention;

FIG. 3 is a schematic view of yet another water heater provided by an embodiment of the present invention;

FIG. 4 is a schematic view of yet another water heater provided by an embodiment of the present invention;

FIG. 5 is a schematic view of yet another water heater provided by an embodiment of the present invention;

FIG. 6 is a schematic view of another water heater provided by an embodiment of the present invention;

FIG. 7 is a schematic view of yet another water heater provided by an embodiment of the present invention;

FIG. 8 is a schematic view of yet another water heater provided by an embodiment of the present invention;

FIG. 9 is a schematic view of yet another water heater provided by an embodiment of the present invention;

FIG. 10 is a schematic view of another water heater provided by an embodiment of the present invention;

FIG. 11 is a schematic view of yet another water heater provided by an embodiment of the present invention;

fig. 12 is a flowchart of a control method of a water heater according to another embodiment of the present invention.

In the drawings: CN3, first temperature sensor; r10 is a first resistor; r7 is a second resistor; a first capacitance C9; CN2, a second temperature sensor; r3, third resistance; r2 is a fourth resistor; c6, a second capacitor; CN3, first temperature sensor; r10 is a first resistor; r7 is a second resistor; c9, a first capacitor; CN2, a second temperature sensor; r3, third resistance; r2 is a fourth resistor; c6, a second capacitor; r17 is a fifth resistor; EC4: first electrolytic capacitor; r18 is a sixth resistor; q3 is a first N-MOS tube; d3, a first fast recovery diode; r14 is a seventh resistor; r20 is eighth resistor; r16, twelfth resistor; EC3 second electrolytic capacitor; r15, thirteenth resistor; q2, a third N-MOS tube; d2, a third fast recovery diode; a fourteenth resistance of R13; r19, fifteenth resistance; r8, sixteenth resistor; q1 is the first triode; r6, seventeenth resistor; r12, eighteenth resistor; r9 is nineteenth resistor; r11 is twentieth resistor; U3B, comparator; c7, third capacitance; c8, a fourth capacitor; r4, twenty-first resistance; r5 is a twenty-second resistor; CN1, power supply part; c3, a fifth capacitor; c5, sixth capacitor; EC1 third electrolytic capacitor; EC2 fourth electrolytic capacitor; r1: a twenty-third resistor; d1: a fourth fast recovery diode; c1: a seventh capacitance; c2: an eighth capacitor; c4: and a ninth capacitor.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.

As shown in fig. 1, an embodiment of the present invention provides a water heater, including:

the control module 101, the acquisition module 102, the segment valve driving module 103, the proportional valve driving module 104 and the stop valve driving module 105;

the control module 101 is respectively connected with the acquisition module 102, the segment valve driving module 103, the proportional valve driving module 104 and the stop valve driving module 105;

the acquisition module 102 is configured to acquire a water inlet flow, a water inlet temperature, and a water outlet temperature of the water heater, and send the water inlet flow, the water inlet temperature, and the water outlet temperature to the control module 101;

the control module 101 is configured to determine a first gas flow according to a preset target temperature, the water inlet flow, the water inlet temperature, and the water outlet temperature, and send a first PWM driving signal corresponding to the first gas flow to the segment valve driving module 103; determining a second fuel flow according to the outlet water temperature and the target temperature, and sending a second PWM driving signal corresponding to the second fuel flow to the proportional valve driving module 104; when the water heater is started, a third PWM driving signal for controlling the opening of a stop valve is sent to the stop valve driving module 105;

the segment valve driving module 103 is configured to control an external segment valve according to the first PWM driving signal;

the proportional valve driving module 104 is configured to control an external proportional valve according to the second PWM driving signal;

and the stop valve driving module 105 is configured to control an external stop valve to open according to the third PWM driving signal.

In the embodiment of the invention, the acquisition module acquires the water inlet flow, the water inlet temperature and the water outlet temperature of the water heater and sends the water inlet flow, the water inlet temperature and the water outlet temperature to the control module. The control module determines a first gas flow according to a target temperature, a water inlet flow, a water inlet temperature and a water outlet temperature preset by a user, sends a first PWM (pulse width modulation) driving signal corresponding to the first gas flow to the sectional valve driving module, and the sectional valve driving module controls the sectional valve according to the first PWM driving signal. The control module determines a second fuel flow according to the outlet water temperature and the target temperature, and sends a second PWM driving signal corresponding to the second fuel flow to the proportional valve driving module, and the proportional valve driving module controls the proportional valve according to the second PWM driving signal. When the water heater is started, the control module sends a third PWM driving signal for controlling the stop valve to be opened to the stop valve driving module, and the stop valve driving module controls the stop valve to be opened in the running process of the water heater according to the third PWM driving signal. Through the linkage of the stop valve, the segment valve and the proportional valve, the thermostatic control is flexibly realized.

Specifically, the step valve is used for controlling the size of a gear, and the fuel gas amount is coarsely adjusted; the proportional valve is used for controlling the gas quantity, and the gas quantity is finely adjusted, so that the firepower is controlled, and the water temperature is adjusted; the stop valve is a safety protection valve and controls whether the gas enters the water heater, and when the water heater is in a standby state or a shutdown state, the valve is closed to prohibit the gas from entering the water heater. When the water heater works, the tap position is adjusted to the gear closest to the preset target temperature through the sectional valve, and when the outlet water temperature and the preset target temperature still have a small temperature difference, the outlet water temperature can be finely adjusted through the proportional valve. For example, when an outlet water temperature is acquired in real time, if a difference between the outlet water temperature and a target temperature is not greater than a preset temperature difference threshold, for example, not greater than 0.5 ℃, when the gas flow is determined at the present time, only the second gas flow may be determined, and the first gas flow is not determined, that is, only the proportional valve is adjusted without adjusting the segment valve, and the shift of the segment valve may be kept unchanged. Otherwise, when the difference is greater than the temperature difference threshold, when the gas flow is determined at the current time, only the first gas flow is determined, and the second gas flow is not determined, that is, only the segment valve is adjusted without adjusting the proportional valve, so as to realize coarse adjustment of the gas. Thus, under the condition of good coarse adjustment effect, the temperature of the outlet water collected again is close to the target temperature generally, so that only fine adjustment can be executed after judgment when the gas flow is determined next time. The water heater is controlled by linkage of the section valve, the proportional valve and the stop valve, so that the water temperature of the water heater cannot change or the change range is very small in the use process, and the constant temperature control is realized.

As shown in fig. 2, the acquisition module includes: an influent water temperature sensor circuit;

the second end of the first resistor is connected with the control module;

In an embodiment of the invention, referring to fig. 2 and fig. 10, the second terminal of the first resistor may be connected to pin No. 15 of the control module.

Specifically, the inlet water temperature sensor circuit is composed of a first temperature sensor, a first resistor, a second resistor and a first capacitor, wherein the first temperature sensor shows different electrical impedance characteristics at different temperatures. The circuit utilizes the RC filter characteristics of the second resistor for voltage division and the first resistor and the first capacitor to convert the inlet water temperature into a corresponding voltage signal and transmit the voltage signal to the control module.

For example, the inlet water temperature sensor circuit is used for detecting the water temperature at the water inlet, converting the inlet water temperature into a corresponding electrical signal and transmitting the electrical signal to the control module, for example, the control module may be a MC96F8316A main control chip.

As shown in FIG. 2, the inlet water temperature sensor circuit is composed of a CN3 external temperature sensor, an R7/R10 resistor and a C9 capacitor, and the temperature sensor shows different electrical impedance characteristics under different temperatures. The circuit converts the temperature into a corresponding voltage signal and transmits the voltage signal to the main control chip by utilizing the resistance voltage division of R7 and the RC filtering characteristic of R10 resistance/C9 capacitance.

As shown in fig. 3, the acquisition module includes: a water outlet temperature sensor circuit;

the second end of the third resistor is connected with the control module;

In an embodiment of the invention, referring to fig. 3 and fig. 10, the second terminal of the third resistor may be connected to pin 14 of the main control chip.

Specifically, the outlet water temperature sensor circuit is composed of a second temperature sensor, a third resistor, a fourth resistor and a second capacitor, wherein the second temperature sensor shows different electrical impedance characteristics at different temperatures. The circuit utilizes the RC filter characteristics of the fourth resistor for voltage division, the third resistor and the second capacitor to convert the outlet water temperature into a corresponding voltage signal and transmit the voltage signal to the control module.

For example, the outlet water temperature sensor circuit is used for detecting the temperature of water, converting the outlet water temperature into a corresponding electric signal and transmitting the electric signal to the MC96F8316A main control chip.

As shown in FIG. 3, the outlet water temperature sensor circuit is composed of a CN2 external temperature sensor, an R2/R3 resistor and a C6 capacitor, and the temperature sensor shows different electrical impedance characteristics at different temperatures. The circuit utilizes the RC filter characteristics of R2 resistance voltage-dividing R3 resistance and C6 capacitance to convert the temperature into corresponding voltage signals and transmit the voltage signals to the main control chip.

The PWM control circuit of the constant-temperature water heater in mass production at present basically adopts the combination of an NPN + PNP triode amplifying circuit, and has the disadvantages of complex relative circuit and relatively high production cost.

In consideration of the existing mode, constant temperature control is mainly realized by adopting an NPN + PNP triode amplifying circuit combination, the constant temperature control is relatively complex, the production cost is relatively high, the scheme can adopt an MC96F8316A chip to carry a core constant temperature algorithm, and a PWM driving circuit is built on the basis of a low-voltage (60V withstand voltage) ultra-low internal resistance N-channel MOS tube, so that the control of a sectional valve, a proportional valve and a stop valve is completed. In this way, in the embodiment of the present invention, each of the segment valve driving module, the proportional valve driving module, and the stop valve driving module may adopt a PWM driving circuit of an N-MOS transistor.

In detail, for the segment valve drive module:

as shown in fig. 4, the segment valve driving module includes: the first N-MOS tube, the first fast recovery diode, the seventh resistor and the eighth resistor are connected in series;

the first end of the fifth resistor is connected with the control module, and the second end of the fifth resistor is connected with the first end of the first electrolytic capacitor;

In an embodiment of the present invention, referring to fig. 4, 7 and 10, a first end of a fifth resistor may be connected to pin No. 18 of the main control chip, a first end of a seventh resistor may be connected to point B in fig. 7, and point B in fig. 7 may be connected to pin No. 25 of the main control chip, so that the first end of the seventh resistor may be connected to pin No. 25 of the main control chip.

Specifically, a fifth resistor, a first electrolytic capacitor, a sixth resistor, a first N-MOS tube, a first fast recovery diode, a seventh resistor and an eighth resistor form a segmented valve driving circuit, a main control chip provides a PWM driving waveform with a certain frequency duty ratio and adjustable speed (the duty ratio is less than 100 percent, direct current control is not allowed), a first N-MOS tube driving signal is formed after the fifth resistor, a first electrolytic capacitor filtering circuit (alternating current isolated direct current is switched on) and a sixth resistor and an eighth resistor voltage dividing circuit, the first N-MOS tube is driven to be switched on and off according to the frequency and the duty ratio provided by the main control chip, and therefore the segmented valve is driven to work, and the first fast recovery diode is used for protecting the first N-MOS tube from explosion.

As shown in fig. 4, an EC4 electrolytic capacitor, a Q3N-MOS transistor, a D3 fast recovery diode, and a R17/R18/R20 resistor constitute a segment valve driving circuit, a main control chip U1 provides a PWM driving waveform with a certain frequency duty ratio and adjustable speed (duty ratio < 100%, dc control is not allowed), and after passing through an R17, a CE4 filter circuit (ac isolated dc) and an R18/R20 voltage divider circuit, a Q3N-MOS transistor driving signal is formed and drives the Q3N-MOS transistor to switch according to the frequency and duty ratio provided by the U1 chip, so as to drive the segment valve to operate, and the D3 fast recovery diode is used for protecting the Q3N-MOS transistor from explosion.

In detail, for the proportional valve drive module:

as shown in fig. 5, the proportional valve driving module includes: the second N-MOS tube, the second fast recovery diode, the ninth resistor, the tenth resistor and the eleventh resistor;

In an embodiment of the present invention, referring to fig. 5, 8 and 10, the gate of the second N-MOS transistor may be connected to the proportional valve control in fig. 8, and the proportional valve PWM in fig. 8 may be connected to pin 19 of the main control chip, so that the gate of the second N-MOS transistor may be connected to pin 19 of the main control chip.

Specifically, the second N-MOS tube, the second fast recovery diode, the ninth resistor, the tenth resistor and the eleventh resistor form a proportional valve driving circuit, the main control chip provides a PWM driving waveform with a certain frequency duty ratio and adjustable speed (the duty ratio is less than or equal to 100% and direct current control is allowed), a second N-MOS tube driving signal is formed after the proportional valve driving circuit passes through the ninth resistor voltage dividing circuit and drives the second N-MOS tube to be switched according to the frequency and the duty ratio provided by the main control chip, so that the proportional valve is driven to work, the second fast recovery diode is used for protecting the second N-MOS tube from explosion, the tenth resistor and the eleventh resistor are current detection parameters, the current passing through the proportional valve is detected by detecting the currents of the tenth resistor and the eleventh resistor and is fed back to the control module through the proportional valve feedback circuit.

Referring to fig. 5, a proportional valve driving circuit is composed of an R21/R22/R23 resistor, a Q4N-MOS transistor, and a D4 fast recovery diode, a main control chip U1 provides a PWM driving waveform with a certain frequency duty ratio and adjustable speed (the duty ratio is less than or equal to 100% and direct current control is allowed), a Q3N-MOS transistor driving signal is formed after passing through an R21 voltage dividing circuit, and the Q4N-MOS transistor is driven to be switched according to the frequency and the duty ratio provided by a U1 chip, so as to drive the proportional valve to work, the D4 fast recovery diode is used for protecting the Q4N-MOS transistor from explosion, the R22/R23 resistor is a detection current parameter, and the current passing through the proportional valve is detected by detecting the current of the R22/R23 resistor, and is fed back to the main control chip U1 through the proportional valve.

In detail, for the shut-off valve drive module:

as shown in fig. 6, the cut-off valve driving module includes: a twelfth resistor, a second electrolytic capacitor, a thirteenth resistor, a third N-MOS tube, a third fast recovery diode, a fourteenth resistor and a fifteenth resistor;

a first end of the fourteenth resistor is connected with the control module, and a second end of the fourteenth resistor is connected with an output end of the stop valve;

In an embodiment of the present invention, referring to fig. 6, fig. 7 and fig. 10, a first end of the twelfth resistor may be connected to pin No. 24 of the main control chip; the first end of the fourteenth resistor may be connected to point B in fig. 7, and the second end of the sixteenth resistor in fig. 7 may be connected to pin No. 25 of the main control chip, so that the first end of the fourteenth resistor may be connected to pin No. 25 of the main control chip.

Specifically, a stop valve driving circuit is composed of a twelfth resistor, a second electrolytic capacitor, a thirteenth resistor, a third N-MOS (N-metal oxide semiconductor) tube, a third fast recovery diode, a fourteenth resistor and a fifteenth resistor, a main control chip gives a PWM (pulse width modulation) driving waveform with a certain frequency duty ratio and adjustable speed (the duty ratio is less than 100 percent and direct current control is not allowed), a third N-MOS tube driving signal is formed after the twelfth resistor, a second electrolytic capacitor filtering circuit (alternating current isolation direct current is conducted), the thirteenth resistor and a fifteenth resistor voltage division circuit, the third N-MOS tube is driven to be switched on and off according to the frequency and the duty ratio given by the main control chip, and therefore the stop valve is driven to work, and the third fast recovery diode is used for protecting the third N-MOS tube from being exploded.

For example, the segment valve driving circuit, the proportional valve driving circuit and the cut-off valve driving circuit convert the PWM low-voltage electrical signal provided by the MC96F8316A main control chip into 24V electrical energy required by the cut-off valve, the segment valve and the proportional valve driving circuit assembly, so as to adjust the opening of the gas valve by the intensity or frequency of the high-voltage electrical energy, so that the gas flow and the water flow are changed in proportion.

Referring to fig. 6, a cutoff valve driving circuit is composed of an EC3 electrolytic capacitor, a Q2N-MOS transistor, a D2 fast recovery diode, and a R16/R15/R19 resistor, a main control chip U1 provides a PWM driving waveform with a certain frequency duty ratio and adjustable speed (duty ratio < 100%, dc control is not allowed), a Q2N-MOS transistor driving signal is formed after a R16 filter circuit, a CE3 filter circuit (ac isolation dc is used) and a R15/R19 voltage dividing circuit, and the Q2N-MOS transistor is driven to be switched according to the frequency and the duty ratio provided by a U1 chip, so as to drive the cutoff valve to operate, and a D2 fast recovery diode is used for protecting the Q2N-MOS transistor from explosion.

As shown in fig. 7, and referring to fig. 4 and 6, the water heater may further include: a first feedback circuit;

In an embodiment of the invention, referring to fig. 7 and 10, the second terminal of the sixteenth resistor in fig. 7 may be connected to pin No. 25 in the main control chip in fig. 10.

Specifically, the sixteenth resistor, the first triode, the seventeenth resistor and the eighteenth resistor; the circuit monitors the running voltage of the stop valve and the sectional valve in real time, when the stop valve and the sectional valve are conducted, the voltage of a point B is zero when the feedback circuit is conducted, the first triode is cut off, and the sixteenth resistor outputs high level; when the stop valve and the segment valve are turned off, the voltage of the point B is 24V, the first triode is conducted and cut off, and the sixteenth resistor outputs low level.

For example, the first feedback circuit may detect the operation states of the stop valve and the segment valve, and convert the detected operation states of the stop valve and the segment valve into corresponding low-voltage signals to be fed back to the MC96F8316A main control chip.

As shown in fig. 7 and referring to fig. 4 and 6, the resistors R6/R8/R12/R13/R14 and the transistor Q1 form a stop valve/segment valve operating state feedback circuit, which monitors the operating voltage of the stop valve and the segment valve in real time, when the stop valve and the segment valve are turned on, the voltage at point B is zero, the Q1 is turned off, and the R8 outputs a high level; when the cut-off valve and the segment valve are closed, the voltage of the point B is 24V, the Q is turned on and off, and the R8 outputs low level.

As shown in fig. 8, the water heater may further include: a second feedback circuit;

In an embodiment of the present invention, referring to fig. 5, fig. 8 and fig. 10, a first end of a nineteenth resistor may be connected to pin No. 19 in the main control chip of fig. 10; a first terminal of the twentieth resistor in fig. 8 may be connected to a first terminal of the tenth resistor in fig. 5, and a second terminal of the twenty-second resistor in fig. 8 may be connected to a gate of the second N-MOS transistor in fig. 5.

Specifically, the nineteenth resistor, the twentieth resistor, the comparator, the third capacitor, the fourth capacitor, the twenty-first resistor and the twenty-second resistor form a proportional valve operation state feedback circuit; the proportional valve feedback current voltage is input into the feedback circuit, and the comparator outputs a corresponding feedback electric signal to the control module by comparing the feedback current voltage with the input control voltage.

For example, the second feedback circuit may detect the operation status of the proportional valve and convert the operation status of the proportional valve into a corresponding low voltage signal to be fed back to the MC96F8316A main control chip.

As shown in FIG. 8, R4/R9/R11/R5 resistor, C7/C8 capacitor and U3B comparator form a proportional valve operation state feedback circuit; the proportional valve feedback current voltage (proportional valve current detect) is input into the feedback circuit, and the U3B comparator outputs a corresponding feedback electric signal to the main control chip by comparing with the input control voltage (proportional valve PWM).

As shown in fig. 9, the water heater may further include: a direct current voltage input circuit;

Specifically, the power supply part (for example, a socket), the fifth capacitor, the sixth capacitor, the third electrolytic capacitor and the fourth electrolytic capacitor form an input filter circuit, and the first direct current voltage and the second direct current voltage which are externally connected obtain the first direct current voltage and the second direct current voltage which are stable and have low ripples after passing through the filter circuit, and provide electric energy for the whole patent circuit.

As shown in fig. 9, CN1/C3/C5/EC1/EC2 constitutes an input filter circuit, and the external DC24V/DC5V DC voltage passes through the filter circuit to obtain a stable and low-ripple DC24V/DC5V DC voltage and provide electric energy for the whole patent circuit.

As shown in fig. 10 and fig. 11, the MC96F8316A chip circuit is composed of a twenty-third resistor, a fourth fast recovery diode, a seventh capacitor, an eighth capacitor, a ninth capacitor, a U2 crystal oscillator, and an MC96F8316A chip. And the twenty-third resistor, the fourth fast recovery diode and the ninth capacitor form a chip reset circuit for starting a chip and downloading a program to be powered on and reset. The U2 crystal oscillator, the seventh capacitor and the eighth capacitor form an oscillating circuit to provide a reference clock for the chip. The MC96F8316A chip is an 8-bit single chip machine and is a core processor controlled by the whole circuit software program.

As shown in fig. 10 and fig. 11, the MC96F8316A chip circuit is composed of an R1 resistor, a D1 fast recovery diode, a C1/C2/C4 capacitor, a U2 crystal oscillator, and an MC96F8316A chip. The R1 resistor, the D1 fast recovery diode and the C4 capacitor form a chip reset circuit which is used for starting a chip and carrying out power-on reset on a downloading program. The U2 crystal oscillator and the C1/C2 capacitor form an oscillating circuit to provide a reference clock for the chip. The MC96F8316A chip is an 8-bit single chip machine and is a core processor controlled by the whole circuit software program.

In summary, in one embodiment of the present invention, there may be a water heater comprising DC24V and DC5V DC voltage input circuits; an influent water temperature sensor circuit; a water outlet temperature sensor circuit; the cut-off valve driving circuit, the segment valve driving circuit and the proportional valve driving circuit; the running state feedback circuit of the stop valve and the segment valve; a proportional valve operation state feedback circuit; MC96F8316A chip circuit.

In detail, for DC24V and DC5V DC voltage input filter circuits, the specific implementation of the circuit can be as shown in fig. 9, and the circuit can provide electric energy for a stop valve, a segment valve, a proportional valve drive circuit assembly and a single chip microcomputer.

For the circuit of the intake water temperature sensor, the specific implementation of the circuit can be as shown in fig. 2, and the circuit can detect the intake water temperature, convert the intake water temperature into a corresponding electrical signal and transmit the electrical signal to the MC96F8316A main control chip.

For the outlet water temperature sensor circuit, the specific implementation of the circuit can be as shown in fig. 3, and the circuit can detect the temperature of the outlet water, convert the outlet water temperature into a corresponding electric signal and transmit the electric signal to the MC96F8316A main control chip.

As for the segment valve PWM driving circuit, the proportional valve PWM driving circuit, and the stop valve PWM driving circuit, the specific implementation of the circuit can be as shown in fig. 4, fig. 5, and fig. 6, and the circuit can convert the PWM low-voltage electrical signal provided by the MC96F8316A main control chip into 24V electrical energy required by the segment valve PWM driving circuit, the proportional valve PWM driving circuit, and the stop valve PWM driving circuit assembly, so as to adjust the opening degree of the gas valve by the intensity or frequency of the high-voltage electrical energy, and make the gas flow and the water flow change in direct proportion.

The specific implementation of the circuit for the feedback circuit of the operation states of the stop valve and the segment valve can be shown in fig. 7, and the circuit can detect the operation states of the stop valve and the segment valve and feed back the detection result that the operation states of the stop valve and the segment valve are converted into corresponding low-voltage signals to the MC96F8316A main control chip.

For the proportional valve operation state feedback circuit, a specific implementation of the circuit may be as shown in fig. 8, and the circuit may detect the operation state of the proportional valve and convert the operation state of the proportional valve into a corresponding low-voltage signal, and feed the low-voltage signal back to the MC96F8316A main control chip.

For the MC96F8316A chip circuit, the specific implementation of the circuit can be as shown in fig. 10, the circuit can be a main control part of the whole circuit, a core constant temperature algorithm is carried, electric signals of each sensor circuit and a feedback circuit are analyzed and processed, and then corresponding PWM driving signals are given to enable the stop valve, the segment valve and the proportional valve assembly to normally operate, so that the purpose of keeping the water temperature constant is achieved.

The single chip microcomputer provides PWM waveforms with certain frequency and duty ratio, the PWM waveforms pass through the PWM driving circuit and then control the stop valve PWM driving circuit, the segment valve PWM driving circuit and the proportional valve PWM driving circuit assembly, so that the firepower of the water heater is controlled, and meanwhile, the water inlet temperature and the water outlet temperature are detected, so that the constant temperature effect is realized.

As shown in fig. 12, an embodiment of the present invention provides a control method for a water heater according to any one of the embodiments of the present invention, including the following steps:

step 201: the water inlet flow, the water inlet temperature and the water outlet temperature of the water heater are collected through the collection module, and the water inlet flow, the water inlet temperature and the water outlet temperature are sent to the control module;

step 202: determining a first gas flow according to a preset target temperature, a preset water inlet flow, a preset water inlet temperature and a preset water outlet temperature through a control module, sending a first PWM (pulse-width modulation) driving signal corresponding to the first gas flow to a sectional valve driving module, determining a second gas flow according to the preset water outlet temperature and the preset water outlet temperature, sending a second PWM driving signal corresponding to the second gas flow to a proportional valve driving module, and sending a third PWM driving signal for controlling the opening of a stop valve to the stop valve driving module when a water heater is started;

step 203: controlling the segmentation valve through the segmentation valve driving module according to the first PWM driving signal;

step 204: controlling the proportional valve according to the second PWM driving signal through the proportional valve driving module;

step 205: and controlling the stop valve to be opened through the stop valve driving module according to the third PWM driving signal.

It is to be understood that the illustrated structure of the embodiment of the present invention does not constitute a specific limitation to the water heater. In other embodiments of the invention, the water heater may include more or fewer components than illustrated, or some components may be combined, some components may be split, or a different arrangement of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

Because the information interaction, execution process and other contents among the units in the method are based on the same concept as the device embodiment of the present invention, specific contents can be referred to the description in the device embodiment of the present invention, and are not described herein again.

The embodiments of the invention have at least the following beneficial effects:

1. in an embodiment of the invention, the acquisition module acquires the water inlet flow, the water inlet temperature and the water outlet temperature of the water heater and sends the water inlet flow, the water inlet temperature and the water outlet temperature to the control module. The control module determines a first gas flow according to a target temperature, a water inlet flow, a water inlet temperature and a water outlet temperature preset by a user, sends a first PWM (pulse width modulation) driving signal corresponding to the first gas flow to the sectional valve driving module, and the sectional valve driving module controls the sectional valve according to the first PWM driving signal. The control module determines a second fuel flow according to the outlet water temperature and the target temperature, and sends a second PWM driving signal corresponding to the second fuel flow to the proportional valve driving module, and the proportional valve driving module controls the proportional valve according to the second PWM driving signal. When the water heater is started, the control module sends a third PWM driving signal for controlling the stop valve to be opened to the stop valve driving module, and the stop valve driving module controls the stop valve to be opened in the running process of the water heater according to the third PWM driving signal. Through the linkage of the stop valve, the segment valve and the proportional valve, the thermostatic control is flexibly realized.

2. In an embodiment of the present invention, the inlet water temperature sensor circuit includes a first temperature sensor, a first resistor, a second resistor, and a first capacitor, and the first temperature sensor exhibits different electrical impedance characteristics at different temperatures. The circuit utilizes the RC filter characteristics of the second resistor voltage division, the first resistor and the first capacitor to convert the water inlet temperature into a corresponding voltage signal and transmit the voltage signal to the control module.

3. In an embodiment of the present invention, the outlet water temperature sensor circuit is composed of a second temperature sensor, a third resistor, a fourth resistor, and a second capacitor, and the second temperature sensor may exhibit different electrical impedance characteristics at different temperatures. The circuit utilizes the RC filter characteristics of the fourth resistor, the third resistor and the second capacitor to convert the outlet water temperature into a corresponding voltage signal and transmit the voltage signal to the control module.

It should be noted that not all steps and modules in the above flows and system structure diagrams are necessary, and some steps or modules may be omitted according to actual needs. The execution order of the steps is not fixed and can be adjusted as required. The system structure described in the above embodiments may be a physical structure or a logical structure, that is, some modules may be implemented by the same physical entity, or some modules may be implemented by a plurality of physical entities, or some components in a plurality of independent devices may be implemented together.

In the above embodiments, the hardware unit may be implemented mechanically or electrically. For example, a hardware element may comprise permanently dedicated circuitry or logic (such as a dedicated processor, FPGA or ASIC) to perform the corresponding operations. The hardware elements may also comprise programmable logic or circuitry, such as a general purpose processor or other programmable processor, that may be temporarily configured by software to perform the corresponding operations. The specific implementation (mechanical, or dedicated permanent, or temporarily set) may be determined based on cost and time considerations.

While the invention has been shown and described in detail in the drawings and in the preferred embodiments, it is not intended to limit the invention to the embodiments disclosed, and it will be apparent to those skilled in the art that various combinations of the code auditing means in the various embodiments described above may be used to obtain further embodiments of the invention, which are also within the scope of the invention.

Claims

1. A water heater, comprising:

the stop valve driving module is used for controlling the opening of an external stop valve according to the third PWM driving signal;

2. The water heater of claim 1,

the collection module comprises: an influent water temperature sensor circuit;

the second end of the first resistor is connected with the control module;

3. The water heater of claim 1,

the collection module comprises: a water outlet temperature sensor circuit;

the second end of the third resistor is connected with the control module;

4. The water heater of claim 1,

5. The water heater of claim 1,

the second end of the thirteenth resistor is connected with the grid electrode of the third N-MOS tube;

6. The water heater of claim 1,

further comprising: a first feedback circuit;

7. The water heater of claim 1,

further comprising: a second feedback circuit;

8. The water heater according to any one of claims 1 to 7,

further comprising: a direct current voltage input circuit;

9. A control method for a water heater according to any one of claims 1 to 8, comprising: