CN212644754U

CN212644754U - Control circuit of strong current executive device of gas wall-mounted boiler

Info

Publication number: CN212644754U
Application number: CN202021041762.3U
Authority: CN
Inventors: 武永华
Original assignee: Fujian Jiangxia University
Current assignee: Zhuhai Baoli Software Development Co.,Ltd.
Priority date: 2020-06-09
Filing date: 2020-06-09
Publication date: 2021-03-02
Anticipated expiration: 2030-06-09

Abstract

The utility model relates to a control circuit of a strong current executive device of a gas wall-mounted furnace, which comprises a MCU, a control module, a pulse ignition circuit, a first relay, a second-stage relay, a third relay, a fourth relay, a fifth relay, a sixth relay and a seventh relay; the sixth relay and the seventh relay are connected in series and are used for controlling the alternating current electromagnetic valve; the first relay, the second relay, the third relay and the fifth relay respectively control the alternating current three-way valve, the water pump electromagnetic valve, the fan electromagnetic valve and the secondary electromagnetic valve; the fourth relay is connected with the pulse ignition circuit; the alternating current electromagnetic valve is respectively connected with the electromagnetic valve and the secondary electromagnetic valve through an alternating current shaping circuit; the third relay is also connected with the fourth relay, and under the condition that the third relay is electrified, the alternating current signal can be transmitted to the fourth relay. The utility model discloses can effectively improve gas hanging stove security performance.

Description

Control circuit of strong current executive device of gas wall-mounted boiler

Technical Field

The utility model relates to a forceful electric power executor field of gas hanging stove, concretely relates to control circuit of forceful electric power executor of gas hanging stove.

Background

The wall-mounted gas boiler integrates heating and domestic hot water supply and is an essential household appliance for a future well-off house. The wall-mounted gas stove adopts clean energy, can meet the requirement of environmental protection to the maximum extent, and is superior to other fuels such as coal or petroleum. In recent years, natural gas pipe networks in various cities, particularly large and medium cities, in China have been popularized basically, so that the gas wall-mounted boiler is widely applied to heating and hot water supply, and the gas wall-mounted boiler is rapidly exploded due to the characteristics of energy conservation, environmental protection and capability of meeting individual requirements of users, and becomes one of popular household electric products at present. Therefore, the wall-mounted gas stove with high design safety, small volume, high efficiency and complete functions has wide market prospect. In this context, the design of the control circuit for the strong electric actuator is particularly important, especially for the circuit design with some software and hardware safety measures. The strong current executive device of the wall-mounted gas furnace mainly comprises an alternating current three-way reversing valve, a water pump, a fan, a pulse ignition unit, an electromagnetic valve, a secondary electromagnetic valve and an alternating current electromagnetic valve.

Disclosure of Invention

In view of this, an object of the present invention is to provide a control circuit for a strong current actuator of a wall-mounted gas stove, which improves the safety of the wall-mounted gas stove.

In order to realize the purpose, the utility model adopts the following technical scheme:

a control circuit of a strong current executive device of a gas wall-mounted furnace comprises an MCU (microprogrammed control Unit), a control module, a pulse ignition circuit, a first relay, a second-stage relay, a third relay, a fourth relay, a fifth relay, a sixth relay and a seventh relay; the sixth relay and the seventh relay are connected in series and are used for controlling the alternating current electromagnetic valve; the first relay, the second relay, the third relay and the fifth relay respectively control the alternating current three-way valve, the water pump electromagnetic valve, the fan electromagnetic valve and the secondary electromagnetic valve; the fourth relay is connected with the pulse ignition circuit; the alternating current electromagnetic valve is respectively connected with the electromagnetic valve and the secondary electromagnetic valve through an alternating current shaping circuit; the first relay, the second relay and the third relay are respectively connected with an alternating current signal; the third relay is also connected with the fourth relay, and under the condition that the third relay is electrified, the alternating current signal can be transmitted to the fourth relay.

Further, the device also comprises an electromagnetic valve switch detection circuit; and the electromagnetic valve switch detection circuit is respectively connected with the alternating current shaping circuit and the MCU.

Furthermore, the device also comprises a failure protection circuit; and one end of the failure protection circuit is connected with the fifth relay, the sixth relay and the seventh relay respectively, and the other end of the failure protection circuit is connected with the MCU.

Further, the MCU adopts a Ryssa singlechip R5F 100F.

Furthermore, the control module adopts a drive chip ULN2003, input pins IN1-IN7 which are connected with the MCU, and output pins OUT0-OUT7 which are respectively connected with the first relay-the seventh relay; when the input pins IN1-IN7 are at 5V high level, the corresponding relays are closed and switched on when the corresponding outputs OUT0-OUT7 are at 0V low level, and when the input pins IN1-IN7 are at 0V low level, the corresponding relays are opened and switched off when the corresponding outputs OUT0-OUT7 are at 24V high level.

Compared with the prior art, the utility model following beneficial effect has:

1. the utility model discloses only when the fan is opened, K3 is closed promptly, and alternating current signal L can only transmit the relay K4 of control pulse ignition and the relay K5 of control secondary solenoid valve to and the relay K6 and the K7 of two series connections of control solenoid valve, realize that the fan must open earlier, just can burn, just so can prevent that the natural gas of burning from leading to the user to be poisoned.

2. The utility model discloses a K6, two relays of K7 establish ties, have effectively avoided the danger that relay inefficacy alternating current solenoid valve can't be turn-offed.

Drawings

Fig. 1 is a circuit diagram of a microprocessor according to an embodiment of the present invention;

FIG. 2 is a diagram illustrating a control circuit during strong current execution according to an embodiment of the present invention;

fig. 3 is a circuit for detecting a solenoid valve according to an embodiment of the present invention;

fig. 4 shows an ignition circuit according to an embodiment of the present invention.

Detailed Description

The present invention will be further explained with reference to the drawings and the embodiments.

Referring to fig. 1 and 2, the present embodiment provides a control circuit of a strong current actuator of a wall-mounted gas boiler, including an MCU, a control module, a pulse ignition circuit, a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay, and a seventh relay; the sixth relay and the seventh relay are connected in series and are used for controlling the alternating current electromagnetic valve; the first relay, the second relay, the third relay and the fifth relay respectively control the alternating current three-way valve, the water pump electromagnetic valve, the fan electromagnetic valve and the secondary electromagnetic valve; the fourth relay is connected with the pulse ignition circuit; the alternating current electromagnetic valve is respectively connected with the electromagnetic valve and the secondary electromagnetic valve through an alternating current shaping circuit; the third relay is also connected with the fourth relay, and under the condition that the third relay is electrified, the alternating current signal can be transmitted to the fourth relay.

In the embodiment, the MCU controls the switching of the water flow of the alternating current three-WAY valve for shower and heating through a first relay K1 by giving a high level and a low level to an MCU _3WAY pin.

The MCU controls the switch of the water PUMP by giving the MCU _ PUMP base pin high and low levels. When the pin of the MCU _ PUMP is at a low level, the corresponding output OUT2 is at a high level of 24V, and the corresponding relay K2 is turned off, so that the water PUMP is not running. When the pin of the MCU _ PUMP is at a high level, the corresponding output OUT2 is at a low level of 0V, and the corresponding relay K2 is closed, so that the water PUMP starts to operate.

The MCU controls the switch of the FAN by giving the MCU _ FAN pin high and low levels. When the pin of MCU _ FAN is at low level, the corresponding output OUT2 is at high level 24V, and the corresponding relay K3 is off, and the FAN is not running. When the pin of the MCU _ FAN is at a high level, the corresponding output OUT2 is at a low level of 0V, and the corresponding relay K3 is closed, so that the FAN starts to operate. Only when the fan is opened, namely the K3 is closed, the alternating current signal L can be transmitted to the relay K4 for controlling pulse ignition, the relay K5 for controlling the secondary electromagnetic valve and the two relays K6 and K7 for controlling the electromagnetic valves in series, so that the fan can be burnt only by being opened first, and the situation that the burnt natural gas causes user poisoning is avoided.

In the present embodiment, it is preferable that two relays K6 and K7 are connected in series to the solenoid valve circuit to ensure that there is no danger of short-circuit failure in any one relay.

In this embodiment, it is preferable that a failure protection circuit is further provided: because when the MCU fails, it cannot output a fixed frequency PWM signal. When the MCU _ GV-is required to be a PWM signal meeting the specification, the Q1S 8050 can be conducted to start the electromagnetic valve. The circuit principle is as follows: when MCU _ GV-is high, C15 forms a loop through R41 and D7 to charge C14, Q1 is conducted, C15 cannot provide C14 charging current after charging is completed, C14 gradually discharges through R40 and Q1S 8050, and Q1S 8050V is achieved after a period of time_beThe voltage drops and Q1S 8050 turns off. The function of the D10 is to complete the draining of the C15 charge when the MCU _ GV-is low and to charge when the MCU _ GV-goes high.

In this embodiment, one path of MCU _ GV + of the preferred solenoid valve is controlled by using the driving chip ULN2003, and the other path of MCU _ GV is driven by using the transistor Q1S 8050, so as to prevent a certain element from being in failure and causing danger.

Through the circuit design of the embodiment, the Q1S 8050 is conducted only when the MCU _ GV-is a PWM pulse signal with fixed frequency, and when the MCU _ GV + is at a low level, the OUT7 is at a high level of 24V, the MCU _ TSK has a voltage of 24V, the K6 and K7 relays are closed, a 220V live wire L enters the system firstly, then is input to the FAN FAN-L, and simultaneously is input to the pulse ignition circuit FIRE-L and the alternating current electromagnetic Valve GL-L, then at the GV-L2 input to the alternating current electromagnetic Valve, a Valve + and a Valve are output through an alternating current shaping circuit, a CN4 interface is connected, and when the MCU _ Svalve is at a low level, the OUT6 is at a high level of 24V, and the secondary electromagnetic Valve is controlled through the K5 relay. Through K6, two relays of K7 are established ties, have effectively avoided the unable danger that shuts off of relay inefficacy alternating current solenoid valve.

Referring to fig. 1, in this embodiment, the MCU uses a rassa single chip microcomputer R5F100F (16-bit controller, 48kB flash memory), and combines the advanced functions of 78K and R8C series, so as to realize low power consumption (66uA/MHz) and high performance (41DMIPS @ 32 MHz). RL78 is based on a 16-bit CISC architecture with rich emulation capabilities. An external crystal oscillator is not needed, and functions of selectable power-on reset, watchdog timers and the like are built in the circuit.

IN the embodiment, the control module adopts a drive chip ULN2003, input pins IN1-IN7 which are connected with the MCU, and output pins OUT0-OUT7 which are respectively connected with a first relay-a seventh relay; when the input pins IN1-IN7 are at 5V high level, the corresponding relays are closed and switched on when the corresponding outputs OUT0-OUT7 are at 0V low level, and when the input pins IN1-IN7 are at 0V low level, the corresponding relays are opened and switched off when the corresponding outputs OUT0-OUT7 are at 24V high level.

Referring to fig. 3, preferably, in this embodiment, a solenoid Valve switch detection circuit is further provided for detecting whether the solenoid Valve operates, and the output of the Valve + and the Valve-is connected to an opto-coupler U10 PC817A through an ac shaping circuit, when the voltage of the Valve + and the Valve-is present, the photodiode of the PC917A is turned on, the triode is turned on, and the MCU _ GValve _ T is at a low level and is input to the microprocessor. When there is no voltage between Valve + and Valve-, the photodiode of the PC917A is turned off, the triode is turned off, and the MCU _ GValve _ T is at high level and input to the microprocessor. And the microprocessor judges whether the electromagnetic valve works or not through the high-low level of the MCU _ GVAlve _ T pin.

Referring to fig. 4, preferably, in the present embodiment, the pulse ignition circuit is driven by an AC220V AC electrical connection, where D28 is a self-triggering thyristor (high voltage trigger tube) and the discharge voltage is 150V. When the voltage at the two ends of the energy storage circuit capacitor C12 reaches 150V, the D28 is automatically conducted, the electric energy in the C12 is released through the D28 and the primary winding of the high-voltage pack T2, an ignition high voltage of about 12-16 kV is generated at the secondary side of the T2, and the ignition voltage is applied to an ignition electrode of the water heater to generate ignition spark, so that the ignition function is completed.

The above is only the preferred embodiment of the present invention, and all the equivalent changes and modifications made according to the claims of the present invention should be covered by the present invention.

Claims

1. The utility model provides a control circuit of forceful electric power executor of gas hanging stove which characterized in that: the device comprises an MCU, a control module, a pulse ignition circuit, a first relay, a second-stage relay, a third relay, a fourth relay, a fifth relay, a sixth relay and a seventh relay; the sixth relay and the seventh relay are connected in series and are used for controlling the alternating current electromagnetic valve; the first relay, the second relay, the third relay and the fifth relay respectively control the alternating current three-way valve, the water pump electromagnetic valve, the fan electromagnetic valve and the secondary electromagnetic valve; the fourth relay is connected with the pulse ignition circuit; the alternating current electromagnetic valve is respectively connected with the electromagnetic valve and the secondary electromagnetic valve through an alternating current shaping circuit; the first relay, the second relay and the third relay are respectively connected with an alternating current signal; the third relay is also connected with the fourth relay, and under the condition that the third relay is electrified, the alternating current signal can be transmitted to the fourth relay.

2. The control circuit of the strong electric actuator of the gas wall-hanging stove according to claim 1, characterized in that: the electromagnetic valve switch detection circuit is also included; and the electromagnetic valve switch detection circuit is respectively connected with the alternating current shaping circuit and the MCU.

3. The control circuit of the strong electric actuator of the gas wall-hanging stove according to claim 1, characterized in that: the device also comprises a failure protection circuit; and one end of the failure protection circuit is connected with the fifth relay, the sixth relay and the seventh relay respectively, and the other end of the failure protection circuit is connected with the MCU.

4. The control circuit of the strong electric actuator of the gas wall-hanging stove according to claim 1, characterized in that: the MCU adopts a Rysa singlechip R5F 100F.

5. The control circuit of the strong electric actuator of the gas wall-hanging stove according to claim 1, characterized in that: the control module adopts a drive chip ULN2003, input pins IN1-IN7 are connected with the MCU, and output pins OUT0-OUT7 are respectively connected with the first relay-the seventh relay; when the input pins IN1-IN7 are at 5V high level, the corresponding relays are closed and switched on when the corresponding outputs OUT0-OUT7 are at 0V low level, and when the input pins IN1-IN7 are at 0V low level, the corresponding relays are opened and switched off when the corresponding outputs OUT0-OUT7 are at 24V high level.