Electrical control circuit of temperature-control energy-saving oven

Abstract

The electrical control circuit of the temperature control energy-saving oven comprises a power supply and an electrical installation plate, a control chip, a first relay, a second relay, a third relay and a ninth relay are respectively installed on the electrical installation plate, and a temperature sensor is connected to the control chip. The control chip is connected with low-voltage control ports of the first relay, the second relay, the third relay and the ninth relay, the live wire end is connected with high-voltage output ports of the first relay, the second relay, the third relay and the ninth relay, and the high-voltage output port of the first relay is connected with a top heating ring. The high-voltage output port of the second relay is connected with a bottom heating ring, the high-voltage output port of the third relay is connected with a back heating ring, the high-voltage output port of the ninth relay is connected with a circulating convection fan, and the top heating ring, the bottom heating ring, the back heating ring and the circulating convection fan are respectively connected with a zero line end; the electrical control circuit is stable in temperature control and energy-saving.

Description

Technical Field

[0001] The utility model relates to the technical field of oven control circuits, in particular to an electrical control circuit of a temperature-controlled energy-saving oven. Background Art

[0002] An oven is a kitchen appliance used for cooking and baking food, usually consisting of an enclosed box and a heating element.

[0003] Among them, in order to speed up the heating speed and ensure the uniform temperature inside the oven, the existing oven structure will increase the heating element and circulate the heat inside the oven through the hot fan. Specifically, for example, the patent document number is CN220852851U, and the patent name is: a Chinese utility model patent for a multifunctional hot air circulation oven, which specifically discloses: including a box body and a control system fixedly installed on the top of the box body and a matching box door hinged at the front end of the box body, the box body is detachably installed with a plurality of equally spaced bearing grid plates, the upper and lower ends of the box body are detachably installed with heating pipes, the center of the control system is plugged with a connecting pipe, and the connecting pipe runs through the control system and the box body to connect the box body and the control system, the control system is detachably installed with a hot air circulation system located directly above the connecting pipe, and the other end of the hot air circulation system runs through the side of the box body and extends to the bottom of the box body, and the hot air circulation system is connected to the inside of the box body. Its working principle is: place the product to be baked on the supporting grid plate, and then close the box door. At this time, the cooling fan, heating tube, and motor are turned on through the control system. The heating tube generates heat to heat the internal gas to bake the product. At the same time, the motor drives the wind wheel to rotate at high speed inside the hood, and attracts the hot air flow inside the box to the inside of the hood through the connecting pipe. Then, under the action of wind force, the hot air flow is blown into the air pipe, and finally discharged from the nozzle to various places inside the box, forming a hot air flow circulation inside the box. Then the hot fan dissipates heat for the control system and the hot air circulation system to avoid temperature rise and damage to the control system and the hot air circulation system due to long-term work.

[0004] However, the above-mentioned multifunctional hot air circulation oven has the following disadvantages in its heating process: when the oven is baking, the heating tubes and the cooling fan at the upper and lower ends are started at the same time to heat the inside of the oven. When the set temperature of the oven is reached, the heating tubes and the cooling fan at the upper and lower ends are stopped at the same time. Then, after a period of time, when the oven is lower than the set temperature, the heating tubes and the cooling fan at the upper and lower ends are started at the same time. Therefore, there are two disadvantages: first, the temperature control is unstable; second, its circuit heating method is not energy-saving. Utility Model Content

[0005] The purpose of the utility model is to overcome the above-mentioned defects in the prior art and provide an electrical control circuit for a temperature-controlled energy-saving oven. The electrical control circuit controls a first relay, a second relay, a third relay and a ninth relay respectively through a control chip, thereby separately controlling a top heating coil, a bottom heating coil, a back heating coil and a circulating convection fan, thereby achieving the purpose of stable temperature control and energy saving.

[0006] To achieve the above-mentioned purpose, the utility model provides an electrical control circuit of a temperature-controlled energy-saving oven, which includes a power supply, one end of the power supply has a live wire end, and the other end has a neutral wire end, and also includes an electrical installation board, on which a control chip, a first relay, a second relay, a third relay and a ninth relay are respectively installed, a temperature sensor is connected to the control chip, and the control chip is respectively connected to the low-voltage control ports of the first relay, the second relay, the third relay and the ninth relay, the live wire end of the power supply is respectively connected to one end of the high-voltage output port of the first relay, the second relay, the third relay and the ninth relay, the other end of the high-voltage output port of the first relay is connected to a top heating coil, the other end of the high-voltage output port of the second relay is connected to a bottom heating coil, the other end of the high-voltage output port of the third relay is connected to a back heating coil, and the other end of the high-voltage output port of the ninth relay is connected to a circulating convection fan, and the top heating coil, the bottom heating coil, the back heating coil and the circulating convection fan are respectively connected to the neutral wire end of the power supply.

[0007] Preferably, the current loop formed between the live wire end of the power supply, the high-voltage output port of the first relay, the high-voltage output port of the second relay, the high-voltage output port of the third relay, the top heating coil, the bottom heating coil, the back heating coil and the neutral wire end of the power supply is set as the first loop, and the current loop formed by the live wire end of the power supply, the high-voltage output port of the ninth relay, the circulating convection fan and the neutral wire end of the power supply is set as the second loop.

[0008] Preferably, it also includes a fourth relay installed on the electrical installation board, the control chip is connected to the low-voltage control port of the fourth relay, one end of the high-voltage output port of the fourth relay is connected to the neutral line terminal of the power supply of the first circuit, and the other end is connected to the common point at one end between the top heating coil, the bottom heating coil and the back heating coil of the first circuit.

[0009] Preferably, a first thermostat, an air circuit breaker and a fuse are connected in series in sequence between the live wire end of the power supply of the second circuit and the high-voltage output port of the ninth relay, and an automatic reset circuit breaker is connected in series between the neutral wire end of the power supply of the second circuit and the high-voltage output port of the ninth relay.

[0010] Preferably, the second circuit is connected to a rectifier bridge circuit, the AC input port of the rectifier bridge circuit is connected in parallel to the second circuit, the DC output port of the rectifier bridge circuit is connected to the control chip, and one end of the low-voltage control port of the first relay, the second relay, the third relay and the ninth relay is connected to the positive end of the DC output port of the rectifier bridge circuit, and the other ends are respectively connected to the output IO ports of the control chip.

[0011] Preferably, it also includes a seventh relay, an eighth relay and a tenth relay, the control chip is respectively connected to the low-voltage control ports of the seventh relay, the eighth relay and the tenth relay, the live wire end of the power supply is respectively connected to one end of the high-voltage output ports of the seventh relay, the eighth relay and the tenth relay, the other end of the high-voltage output port of the seventh relay is connected to an oven locking motor, the other end of the high-voltage output port of the eighth relay is connected to a cooling fan, the other end of the high-voltage output port of the tenth relay is connected to an oven lighting lamp, and the oven locking motor, cooling fan and oven lighting lamp are respectively connected to the neutral wire end of the power supply.

[0012] Preferably, the control chip is communicatively connected to an oven touch control LCD display panel.

[0013] Preferably, the control chip is a SH79F326 chip.

[0014] Preferably, the temperature sensor is a MAX6675 chip for measuring the internal temperature of the oven.

[0015] Preferably, a food probe connected to the control chip is also included.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] The electrical control circuit of a temperature-controlled energy-saving oven controls the first relay, the second relay, the third relay and the ninth relay respectively through the control chip, thereby individually controlling the top heating coil, the bottom heating coil, the back heating coil and the circulating convection fan, and then senses through the temperature sensor through the control chip, so that the top heating coil, the bottom heating coil, the back heating coil and the circulating convection fan can be individually controlled according to the difference between the current measured temperature and the set temperature of the oven, thereby achieving the purpose of stable temperature control and energy saving. (That is, if the temperature difference is large, a combined heating method is used for heating, and if the temperature difference is small, a single heating method is used for heating, which is not only energy-saving, but also has a small temperature fluctuation range, thereby achieving a stable temperature control effect) BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the structure of an oven used in an electrical control circuit of a temperature-controlled energy-saving oven provided by an embodiment of the utility model;

[0020] Figure 2 It is a circuit principle diagram of an electrical control circuit of a temperature-controlled energy-saving oven provided by an embodiment of the utility model;

[0021] Figure 3 This is a circuit diagram of an electrical control circuit of a temperature-controlled energy-saving oven provided by an embodiment of the utility model (the Figure 3 The control chip is hidden);

[0022] Figure 4 This is a circuit diagram of an electrical control circuit of a temperature-controlled energy-saving oven provided by an embodiment of the utility model (the Figure 3 Hidden control chip and oven touch control LCD display panel);

[0023] Figure 5 It is a circuit diagram of a rectifier bridge circuit and a control chip provided in an embodiment of the utility model;

[0024] Figure 6 It is a work flow chart of one of the control strategies of program three of the working principle of an electrical control circuit of a temperature-controlled energy-saving oven provided by an embodiment of the utility model.

[0025] Included in the figure are:

[0026] C1, first circuit; C2, second circuit; C3, rectifier bridge circuit; E1, electrical installation board; E2, control chip; E3, oven touch control LCD display panel; h1, top heating coil; h10, oven lighting; h2, bottom heating coil; h3, back heating coil; h7, oven lock motor; h8, cooling fan; h9, circulating convection fan; L, live wire terminal; N, neutral wire terminal; P1, power supply; P11, three-pin power plug; P12, AC power connector; RY1, first relay; RY10, tenth relay; RY2, second relay; RY3, third relay; RY4, fourth relay; RY7, seventh relay; RY8, eighth relay; RY9, ninth relay; T1, first thermostat; T2, second thermostat; TS, temperature sensor. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in this embodiment of the utility model to clearly and completely describe the technical solution in this embodiment of the utility model. Obviously, the described embodiment is one embodiment of the utility model, not all embodiments of the utility model. Based on this embodiment of the utility model, all other embodiments of the utility model obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] See also Figures 2 to 6 The embodiment of the utility model provides an electrical control circuit of a temperature-controlled energy-saving oven, which includes a power supply P1, one end of the power supply P1 has a live wire terminal L, and the other end has a neutral wire terminal N; it also includes an electrical installation board E1, on which a control chip E2, a first relay RY1, a second relay RY2, a third relay RY3 and a ninth relay RY9 are respectively installed, and a temperature sensor TS is connected to the control chip E2, and the control chip E2 is respectively connected to the low-voltage control ports of the first relay RY1, the second relay RY2, the third relay RY3 and the ninth relay RY9, and the live wire terminal L of the power supply P1 is respectively It is connected to one end of the high-voltage output port of the first relay RY1, the second relay RY2, the third relay RY3 and the ninth relay RY9, the other end of the high-voltage output port of the first relay RY1 is connected to the top heating coil h1, the other end of the high-voltage output port of the second relay RY2 is connected to the bottom heating coil h2, the other end of the high-voltage output port of the third relay RY3 is connected to the back heating coil h3, the other end of the high-voltage output port of the ninth relay RY9 is connected to the circulating convection fan h9, the top heating coil h1, the bottom heating coil h2, the back heating coil h3 and the circulating convection fan h9 are respectively connected to the neutral line terminal N of the power supply P1.

[0029] See also Figure 1 In this embodiment, an electrical control circuit of a temperature-controlled energy-saving oven is installed on the oven for use. A power source P1 is externally connected to the outside of the oven, a back heating coil h3 is installed on the back of the oven, and the back heating coil h3 is arranged in a ring shape. A circulating convection fan h9 is installed inside the ring of the back heating coil h3. The top heating coil h1 is installed on the top of the oven. The electrical installation board E1 is installed on the top of the top heating coil h1, and the bottom heating coil h2 is installed on the bottom of the oven. The oven touch control LCD display panel E3 is installed on the top of one side wall of the oven. In this embodiment, the control chip E2 is not displayed on the front of the electrical installation board E1. The control chip E2 is installed inside the electrical installation board E1 (a shielding layer is provided on the outside of the control chip E2), or the control chip E2 is installed on the back of the electrical installation board E1. (A shielding layer is provided on the side of the control chip E2 close to the electrical installation board E1)

[0030] The power supply P1 includes a three-pin power supply P1 plug and an AC power supply P1 connector electrically connected to the power supply P1 plug. The live wire terminal L of the power supply P1 is connected to the L terminal of the AC power supply P1 connector, and the neutral wire terminal N of the power supply P1 is connected to the N terminal of the AC power supply P1 connector.

[0031] A current loop formed between the live wire terminal L of the power supply P1, the high-voltage output port of the first relay RY1, the high-voltage output port of the second relay RY2, the high-voltage output port of the third relay RY3, the top heating coil h1, the bottom heating coil h2, the back heating coil h3 and the neutral wire terminal N of the power supply P1 is set as the first loop C1. In the first loop C1, the first relay RY1, the second relay RY2 and the third relay RY3 are arranged in parallel.

[0032] In the first circuit C1:

[0033] The fourth relay RY4 is also included, which is installed on the electrical installation board E1. The control chip E2 is connected to the low-voltage control port of the fourth relay RY4. One end of the high-voltage output port of the fourth relay RY4 is connected to the neutral terminal N of the power supply P1 of the first circuit C1, and the other end is connected to the common point of one end between the top heating coil h1, the bottom heating coil h2 and the back heating coil h3 of the first circuit C1. The fourth relay RY4 is provided at the neutral terminal N of the power supply P1 to further ensure safety and avoid short circuits that cause the neutral line to be charged, thereby mistakenly starting the above three heating coils and causing oven accidents.

[0034] The current loop formed by the live terminal L of the power source P1, the high voltage output port of the ninth relay RY9, the circulating convection fan h9 and the neutral terminal N of the power source P1 is set as the second loop C2. The first loop C1 and the second loop C2 are set in parallel.

[0035] In the second circuit C2:

[0036] A. It also includes a seventh relay RY7, an eighth relay RY8 and a tenth relay RY10, the control chip E2 is respectively connected to the low-voltage control ports of the seventh relay RY7, the eighth relay RY8 and the tenth relay RY10, the live wire terminal L of the power supply P1 is respectively connected to one end of the high-voltage output ports of the seventh relay RY7, the eighth relay RY8 and the tenth relay RY10, the other end of the high-voltage output port of the seventh relay RY7 is connected to the oven lock motor h7, the other end of the high-voltage output port of the eighth relay RY8 is connected to the cooling fan h8, the other end of the high-voltage output port of the tenth relay RY10 is connected to the oven lighting h10, the oven lock motor h7, the cooling fan h8 and the oven lighting h10 are respectively connected to the neutral wire terminal N of the power supply P1.

[0037] B. The first thermostat T1, the air circuit breaker and the fuse are connected in series between the live wire terminal L of the power supply P1 of the second circuit C2 and the high-voltage output port of the ninth relay RY9, and the automatic reset circuit breaker is connected in series between the neutral wire terminal N of the power supply P1 of the second circuit C2 and the high-voltage output port of the ninth relay RY9. The first thermostat T1, the air circuit breaker and the fuse can prevent the lock hook motor, the cooling fan, the circulating convection fan h9, the oven light h10 and other electronic components from being damaged by short circuit or excessive current.

[0038] C. Further, the positive and negative poles of the oven lock motor h7, the heat dissipation fan h8, the oven lighting lamp h10 and the circulating convection fan h9 are installed through the male end of the plug-in terminal, and the electrical installation board E1 is installed with the female end of the plug-in terminal respectively installed with the seventh relay RY7, the eighth relay RY8, the ninth relay RY9, the tenth relay RY10 and the neutral terminal N of the power supply P1. The male end of the plug-in terminal is plugged into the female end of the plug-in terminal. The purpose of such a setting is to facilitate wiring and facilitate the connection of the oven lock motor h7, the heat dissipation fan h8, the oven lighting lamp h10 and the circulating convection fan h9 with the electrical installation board E1. Among them, the oven lock motor h7 is used to lock or unlock the oven door; when the oven is finished baking, the heat dissipation fan h8 is used to accelerate the heat dissipation inside the oven; when the user opens the oven, the oven lighting lamp h10 is used to illuminate the inside of the oven.

[0039] D. The second circuit C2 is connected to the rectifier bridge circuit C3, the AC input port of the rectifier bridge circuit C3 is connected in parallel to the second circuit C2, the DC output port of the rectifier bridge circuit C3 is connected to the control chip E2, and one end of the low-voltage control port of the first relay RY1, the second relay RY2, the third relay RY3, the fourth relay RY4, the seventh relay RY7, the eighth relay RY8, the ninth relay RY9 and the tenth relay RY10 are all connected to the positive end of the DC output port of the rectifier bridge circuit C3, and the other ends are respectively connected to the output IO port of the control chip E2. (Due to the excessive number of connected output IO ports, please refer to the details. Figure 5 , Figure 5 The circuit connection diagram of the control chip E2 and the low-voltage control ports of the first relay RY1, the second relay RY2, the third relay RY3, the fourth relay RY4, the seventh relay RY7, the eighth relay RY8, the ninth relay RY9 and the tenth relay RY10, and the temperature sensor TS)

[0040] In the connection between the rectifier bridge circuit C3 and the control chip E2:

[0041] A. Several second thermostats T2 connected in series are connected between one end of the low-voltage control port of the first relay RY1, the second relay RY2, the third relay RY3 and the fourth relay RY4 and the positive end of the DC output port of the rectifier bridge loop C3. The function of the second thermostat T2 is to monitor whether the temperature inside the oven exceeds the maximum temperature. If the temperature exceeds the maximum temperature, the second thermostat T2 disconnects the low-voltage control ports of the first relay RY1, the second relay RY2, the third relay RY3 and the fourth relay RY4, thereby ensuring that the live wire terminal L and the neutral wire terminal N of the power supply P1 of the first loop C1 are disconnected from the top heating coil h1, the bottom heating coil h2 and the back heating coil h3, thereby avoiding various high temperature and short circuit scenarios that may cause damage to the oven. Furthermore, the positive and negative poles of the second temperature controller T2 are installed through the male end of the plug-in terminal, and the electrical installation board E1 is equipped with a female end of the plug-in terminal connected to one end of the low-voltage control port of the first relay RY1, the second relay RY2, the third relay RY3 and the fourth relay RY4, and the positive end of the DC output port of the rectifier bridge circuit C3. The male end of the plug-in terminal is plugged into the female end of the plug-in terminal. The purpose of this arrangement is to facilitate wiring and facilitate the connection of the second thermostat T2 with the electrical installation board E1.

[0042] B. The control chip E2 is connected to the oven touch control LCD display panel E3. Specifically, the electrical installation board E1 is equipped with a female plug-in terminal, which has a TX interface, an RX interface, a 5v power supply P1 interface and a GND interface, and these interfaces are connected to the control chip E2. At the same time, the top of one side wall of the oven is provided with an oven touch control LCD display panel E3, which is externally connected to a row of wires and a male plug-in terminal connected to the row of wires, and the male plug-in terminal is plugged into the eighteenth female plug-in terminal.

[0043] C. The control chip E2 is SH79F326 chip.

[0044] D. The temperature sensor TS is a MAX6675 chip used to measure the internal temperature of the oven.

[0045] E. also includes a food probe connected to the control chip E2. The user can check the internal temperature of the food by executing the food probe action, so as to adjust his or her cooking strategy.

[0046] The working principle of the electrical control circuit of a temperature-controlled energy-saving oven in the embodiment of the utility model is as follows:

[0047] S0: The user enters the set temperature on the oven touch control LCD panel E3.

[0048] S1: The control chip E2 reads the set temperature and executes program 1 first: controls the top heating ring h1, the bottom heating ring h2 and the back heating ring h3 to work simultaneously, quickly raising the internal temperature of the oven to the set temperature. The internal temperature of the oven is sensed by the temperature sensor TS.

[0049] S2: Execute procedure 2 again: When the temperature reaches the set temperature, stop the three heating coils in step S1, and turn on the circulating convection fan h9 to evenly distribute the temperature at various positions inside the oven. At the same time, the three heating coils will generate residual heat for heat preservation, and the control chip E2 will record the temperature holding time.

[0050] S3: Further execute program three: When the temperature inside the oven drops, the temperature drop rate can be obtained through the temperature control PID program of the prior art, and then the heating time required for the temperature drop rate, the temperature heating rate, temperature holding time and heating time brought about by different combinations of the above three heating coils are comprehensively considered. The most energy-saving heating method is calculated according to the different combinations and heating times of the above three heating coils. The control chip E2 executes different heating combinations of the three heating coils according to the most energy-saving heating method, thereby achieving the purpose of stable temperature control and energy saving.

[0051] (In essence, according to the difference between the currently measured temperature and the set temperature of the oven, the control chip E2 can independently control the top heating coil h1, the bottom heating coil h2, the back heating coil h3 and the circulating convection fan h9. The temperature control PID program of the prior art can be used for basic adjustment to realize different control strategies (quantity combination, time and sequence control strategies) for independently controlling the top heating coil h1, the bottom heating coil h2, the back heating coil h3 and the circulating convection fan h9, thereby achieving the purpose of stable temperature control and energy saving.)

[0052] (For the implementation of one of the control strategies in this procedure three, please refer to Figure 6 )

[0053] S4: When the oven is kept at a constant temperature and the heating is stopped, the circulating convection fan h9 switches to an intermittent working mode, with the intermittent time being N seconds per minute (for example, 3 seconds per minute). Then the rotation inertia of the fan is used to keep the air flowing and the temperature uniform inside the oven, further ensuring stable temperature control and energy saving.

[0054] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An electrical control circuit for a temperature-controlled energy-saving oven, comprising a power supply (P1), wherein one end of the power supply (P1) has a live wire terminal (L) and the other end has a neutral wire terminal (N), characterized in that: The invention also comprises an electrical installation board (E1), on which a control chip (E2), a first relay (RY1), a second relay (RY2), a third relay (RY3) and a ninth relay (RY9) are respectively installed, the control chip (E2) is connected to a temperature sensor (TS), the control chip (E2) is respectively connected to low-voltage control ports of the first relay (RY1), the second relay (RY2), the third relay (RY3) and the ninth relay (RY9), the live wire end (L) of the power supply (P1) is respectively connected to the first relay (RY1), the second relay (RY2), the third relay (RY3) and the ninth relay (RY9) One end of the high-voltage output port of the ninth relay (RY9) is connected, the other end of the high-voltage output port of the first relay (RY1) is connected to the top heating coil (h1), the other end of the high-voltage output port of the second relay (RY2) is connected to the bottom heating coil (h2), the other end of the high-voltage output port of the third relay (RY3) is connected to the back heating coil (h3), and the other end of the high-voltage output port of the ninth relay (RY9) is connected to the circulating convection fan (h9), and the top heating coil (h1), the bottom heating coil (h2), the back heating coil (h3) and the circulating convection fan (h9) are respectively connected to the neutral line terminal (N) of the power supply (P1).

2. The electrical control circuit of a temperature-controlled energy-saving oven according to claim 1, characterized in that: A current loop formed between the live wire terminal (L) of the power supply (P1), the high-voltage output port of the first relay (RY1), the high-voltage output port of the second relay (RY2), the high-voltage output port of the third relay (RY3), the top heating coil (h1), the bottom heating coil (h2), the back heating coil (h3) and the neutral wire terminal (N) of the power supply (P1) is set as a first loop (C1), and a current loop formed by the live wire terminal (L) of the power supply (P1), the high-voltage output port of the ninth relay (RY9), the circulating convection fan (h9) and the neutral wire terminal (N) of the power supply (P1) is set as a second loop (C2).

3. The electrical control circuit of a temperature-controlled energy-saving oven according to claim 2, characterized in that: It also includes a fourth relay (RY4) installed on the electrical installation board (E1), the control chip (E2) is connected to the low-voltage control port of the fourth relay (RY4), one end of the high-voltage output port of the fourth relay (RY4) is connected to the neutral terminal (N) of the power supply (P1) of the first circuit (C1), and the other end is connected to a common point at one end between the top heating coil (h1), the bottom heating coil (h2) and the back heating coil (h3) of the first circuit (C1).

4. The electrical control circuit of a temperature-controlled energy-saving oven according to claim 2, characterized in that: A first thermostat (T1), an air circuit breaker and a fuse are connected in series in sequence between the live wire terminal (L) of the power supply (P1) of the second circuit (C2) and the high-voltage output port of the ninth relay (RY9), and an automatic reset circuit breaker is connected in series between the neutral wire terminal (N) of the power supply (P1) of the second circuit (C2) and the high-voltage output port of the ninth relay (RY9).

5. The electrical control circuit of a temperature-controlled energy-saving oven according to claim 2, characterized in that: The second circuit (C2) is connected to a rectifier bridge circuit (C3), an AC input port of the rectifier bridge circuit (C3) is connected in parallel to the second circuit (C2), a DC output port of the rectifier bridge circuit (C3) is connected to a control chip (E2), one end of low-voltage control ports of the first relay (RY1), the second relay (RY2), the third relay (RY3) and the ninth relay (RY9) are all connected to the positive end of the DC output port of the rectifier bridge circuit (C3), and the other ends are respectively connected to output IO ports of the control chip (E2) in a one-to-one correspondence.

6. The electrical control circuit of a temperature-controlled energy-saving oven according to claim 4, characterized in that: The invention also comprises a seventh relay (RY7), an eighth relay (RY8) and a tenth relay (RY10), wherein the control chip (E2) is respectively connected to the low-voltage control ports of the seventh relay (RY7), the eighth relay (RY8) and the tenth relay (RY10), the live wire end (L) of the power supply (P1) is respectively connected to one end of the high-voltage output ports of the seventh relay (RY7), the eighth relay (RY8) and the tenth relay (RY10), the other end of the high-voltage output port of the seventh relay (RY7) is connected to an oven locking motor (h7), the other end of the high-voltage output port of the eighth relay (RY8) is connected to a cooling fan (h8), the other end of the high-voltage output port of the tenth relay (RY10) is connected to an oven lighting lamp (h10), and the oven locking motor (h7), the cooling fan (h8) and the oven lighting lamp (h10) are respectively connected to the neutral wire end (N) of the power supply (P1).

7. The electrical control circuit of a temperature-controlled energy-saving oven according to claim 6, characterized in that: The control chip (E2) is communicatively connected to an oven touch control liquid crystal display panel (E3).

8. The electrical control circuit of a temperature-controlled energy-saving oven according to claim 1, characterized in that: The control chip (E2) is a SH79F326 chip.

9. The electrical control circuit of a temperature-controlled energy-saving oven according to claim 1, characterized in that: The temperature sensor (TS) is a MAX6675 chip used to measure the internal temperature of the oven.

10. The electrical control circuit of a temperature-controlled energy-saving oven according to claim 1, characterized in that: Also included is a food probe connected to the control chip (E2).

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