CN209844844U

CN209844844U - Power supply isolation power supply circuit and induction cooker

Info

Publication number: CN209844844U
Application number: CN201920813903.XU
Authority: CN
Inventors: 赵礼荣; 孙鹏刚
Original assignee: Zhejiang Shaoxing Supor Domestic Electrical Appliance Co Ltd
Current assignee: Zhejiang Shaoxing Supor Domestic Electrical Appliance Co Ltd
Priority date: 2019-05-31
Filing date: 2019-05-31
Publication date: 2019-12-24
Anticipated expiration: 2029-05-31

Abstract

The embodiment of the utility model provides a power supply isolation supply circuit and electromagnetism stove. The circuit includes: the BUCK switching power supply, the secondary winding, the voltage reduction circuit, the working circuit, the mainboard chip and the display panel; the BUCK switching power supply comprises a power supply chip and a primary winding; the primary winding and the secondary winding form a transformer, the primary winding is respectively connected with the working circuit and the voltage reduction circuit, and the voltage reduction circuit is connected with the mainboard chip; the secondary winding is connected to the display panel. The electric energy output by the primary winding is supplied to the main board chip through the voltage reduction circuit, and then the primary winding and the secondary winding are arranged to form the transformer, so that the electric energy output by the secondary winding is supplied to the display board, the isolation between the main board chip and the display board is realized based on the original primary winding of the BUCK switching power supply, and the manufacturing cost of the induction cooker is reduced.

Description

Power supply isolation power supply circuit and induction cooker

Technical Field

The utility model relates to a household electrical appliances technical field especially relates to a power supply circuit and electromagnetism stove are kept apart to power.

Background

The induction cooker is a common household appliance for heating, and comprises a main board chip and a display board, wherein when a cooker arranged on the induction cooker is electrically connected with the induction cooker, the main board chip and the display board need to be isolated to prevent dangers such as electric leakage.

At present, when the isolation between the motherboard chip and the display panel is performed in the prior art, an independent winding is usually added in a transformer of a switching power supply of an induction cooker, so that the winding supplies power to the motherboard chip, while the display panel still adopts the winding of the original transformer to supply power, thereby realizing the isolation between the motherboard chip and the display panel,

however, the manner of adding windings in the prior art causes problems of high cost and affecting the standardization of the induction cooker.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides a power supply isolation supply circuit and electromagnetism stove to overcome and increase the winding and in order to realize keeping apart and the expensive problem of cost that leads to.

In a first aspect, an embodiment of the present invention provides a power isolation power supply circuit, including:

the BUCK switching power supply, the secondary winding, the voltage reduction circuit, the working circuit, the mainboard chip and the display panel; the BUCK switching power supply comprises a power supply chip and a primary winding; wherein

The primary winding and the secondary winding form a transformer, the primary winding is respectively connected with the working circuit and the voltage reduction circuit, and the voltage reduction circuit is connected with the mainboard chip;

the secondary winding is connected to the display panel.

The utility model provides a power supply isolation power supply circuit, include: the BUCK switching power supply, the secondary winding, the voltage reduction circuit, the working circuit, the mainboard chip and the display panel; the BUCK switching power supply comprises a power supply chip and a primary winding; the primary winding and the secondary winding form a transformer, the primary winding is respectively connected with the working circuit and the voltage reduction circuit, and the voltage reduction circuit is connected with the mainboard chip; the secondary winding is connected to the display panel. The electric energy output by the primary winding is supplied to the main board chip through the voltage reduction circuit, and then the primary winding and the secondary winding are arranged to form the transformer, so that the electric energy output by the secondary winding is supplied to the display board, the isolation between the main board chip and the display board is realized based on the original primary winding of the BUCK switching power supply, the problem that the cost is high due to the fact that the winding is added to achieve isolation is avoided, and the manufacturing cost of the induction cooker is reduced.

In one possible design, one end of the primary winding 12 is grounded to the motherboard chip 50, and the other end of the primary winding 12 is connected to the power chip 11;

one end of the secondary winding 20 is connected to the display panel 60, and the other end of the secondary winding 20 is grounded and is commonly grounded to the display panel 60.

Through setting up primary winding and mainboard chip common ground to and secondary winding and display panel common ground, thereby make when setting up mainboard chip and display panel earthing terminal separately set up, with the isolation between more effectual realization mainboard chip and the display panel.

In one possible design, the voltage-reducing circuit includes a voltage-reducing resistor R150, one end of the voltage-reducing resistor R150 is connected to one end of the primary winding 12, and the other end of the voltage-reducing resistor R150 is connected to the motherboard chip 50.

Through setting up step-down resistance R150, realized stepping down to the power of primary winding output to supplying power to the mainboard chip, wherein the cost of step-down resistance is lower, and the logic that realizes the step-down is simple, easily realizes.

In one possible design, the primary winding 12 has a greater number of turns than the secondary winding 20.

The number of turns of the primary winding is larger than that of the secondary winding, so that the voltage reduction of the transformer formed by the primary winding and the secondary winding is realized, the output of the secondary winding can meet the requirement of a power supply for the work of a display panel, and the waste of electric energy is avoided.

In one possible design, further comprising: and one end of the rectification filtering voltage stabilizing circuit is connected with one end of the secondary winding, and the other end of the rectification filtering voltage stabilizing circuit is connected with the display panel.

By arranging the rectification filtering voltage stabilizing circuit, a smooth power supply can be obtained for the display panel to work normally

In a possible design, a control loop 111 and a switch tube 112 are arranged in the power chip 11, and the BUCK switch power supply 10 further includes a diode and a capacitor;

one end of the diode is respectively connected with the switching tube 112 and the other end of the primary winding 12, and the other end is grounded;

one end of the capacitor is grounded, and the other end of the capacitor is connected to one end of the primary winding 12 and the voltage-reducing circuit 30.

The high-voltage alternating-current power supply is connected through the setting control loop, voltage reduction and alternating-current conversion are achieved through circuit devices in the switch tube control switch power supply, the circuit devices of the diodes and the capacitors are simple in design and easy to achieve, and design complexity of circuits can be reduced.

In one possible design, further comprising: and one end of the filtering and voltage stabilizing circuit is connected with the voltage reducing circuit, and the other end of the filtering and voltage stabilizing circuit is connected with the mainboard chip.

The interference frequency band of the power supply is eliminated by arranging the filtering voltage stabilizing circuit, so that the interference of the circuit is inhibited and prevented, and the stability of the circuit is ensured.

In one possible design, the operating circuit 40 includes a fan and an IGBT driver circuit.

The fan and the IGBT driving circuit can ensure the heat dissipation and the normal work of the induction cooker, thereby improving the working stability of the induction cooker.

In a second aspect, embodiments of the present invention provide an induction cooking appliance, which includes the first aspect and various possible designs of the first aspect.

In one possible design, the display panel is provided with an interface for electrical connection with a cookware.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described 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 inventive labor.

Fig. 1 is a schematic structural diagram of a power supply isolation circuit provided by the present invention;

fig. 2 is a schematic structural diagram of a power isolation power supply circuit according to the present invention;

fig. 3 is a schematic structural diagram of the power isolation power supply circuit provided by the present invention.

Description of reference numerals:

10-BUCK switching power supply; 20-a secondary winding; 30-a voltage reduction circuit;

40-a working circuit; 50-a motherboard chip; 60-a display panel;

70-rectifying, filtering and voltage stabilizing power 80-filtering and voltage stabilizing power 11-power chip;

a way; a way;

12-a primary winding; 111-control loop; 112-a switching tube;

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying 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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The induction cooker is a common household appliance for heating, and when the induction cooker works, high-frequency alternating current is utilized to pass through the coil panel so as to enable the bottom of a pot placed on the induction cooker to generate eddy current, so that the pot arranged on the induction cooker is heated.

Specifically, a main board chip and a display panel are usually arranged in the electromagnetic oven, the main board chip is used for realizing a specific heating function, the display panel is used for displaying related functions of the electromagnetic oven, and the like, wherein the main board chip and the display panel are both devices arranged on the existing electromagnetic oven, and details are not repeated here.

Further, the utility model provides a be provided with the interface on the display panel of electromagnetism stove, wherein the concrete model of interface can set up according to the bayonet joint of pan, does not restrict to this here, and in this embodiment, the interface is used for being connected with the pan electricity, and wherein set up the electricity and connect additional functions such as can realize the anti-overflow, measure pan temperature to the usability of extension electromagnetism stove, however, if mainboard chip does not keep apart with the display panel, can lead to electric shock or circuit fault scheduling problem.

At present, when the isolation between the motherboard chip and the display panel is realized in the prior art, the motherboard chip is usually supplied with power by adding a set of windings, so as to realize the isolation between the motherboard chip and the display panel, the detailed implementation process of the prior art is described below by combining fig. 1, and fig. 1 is the structure schematic diagram of the prior art provided by the utility model.

As shown in fig. 1, the induction cooker includes a main board chip and a display board, wherein a winding 1 of a transformer T101, diodes D109, D115, D3, capacitors C119, C111, C120 and a switching power supply chip IC101 together constitute a BUCK switching power supply for converting a connected ac power into a dc power to supply power to the induction cooker.

Wherein, winding 1 and winding 2 of transformer T101 constitute first transformer for thereby obtain the electric energy that can supply the mainboard chip work to the electric energy that winding 1 provided carries out the vary voltage, in order to realize the isolation between mainboard chip and the display panel, it constitutes the second transformer to need to increase winding 3 and winding 1 this moment, thereby obtain the electric energy that can supply the display panel work to carry out the vary voltage to the electric energy that winding 1 provided, make mainboard chip and display panel receive the power from the winding of difference through the mode that increases the winding, thereby realize the isolation between mainboard chip and the display panel.

In an alternative implementation manner, the winding 3 may be used as an original winding to supply power to the display panel, and the winding 2 is used as a newly added winding to supply power to the motherboard chip.

However, the way of adding the winding will increase the manufacturing cost of the induction cooker and affect the standardized manufacturing of the induction cooker, and based on the above problems, the present invention provides a power isolation power supply circuit, which is described in detail with reference to specific embodiments, and first described with reference to fig. 2.

Fig. 2 is a schematic structural diagram of the power supply isolation circuit according to the present invention. As shown in fig. 2, the circuit includes: a BUCK switching power supply 10, a secondary winding 20, a voltage step-down circuit 30, an operating circuit 40, a main board chip 50, and a display panel 60; the BUCK switching power supply 10 comprises a power supply chip 11 and a primary winding 12; wherein

The primary winding 12 and the secondary winding 20 form a transformer, the primary winding 12 is respectively connected with the working circuit 40 and the voltage reduction circuit 30, and the voltage reduction circuit 30 is connected with the mainboard chip 50;

the secondary winding 20 is connected to the display panel 60.

The BUCK switching power supply 10 is a switching power supply for converting a high-voltage ac power supply into a low-voltage dc power supply, for example, the BUCK switching power supply 10 is connected to a 220V ac power supply, and the dc power supply of 18V can be output through the BUCK switching power supply 10.

Specifically, the BUCK switching power supply 10 includes a power supply chip 11 and a primary winding 12, where the power supply chip 11 is a chip for implementing voltage reduction and ac-to-dc conversion logic, and optionally, different power supply chips 11 may implement different voltage reduction functions.

For example, a certain type of power chip 11 may convert 220V ac power into 18V dc power, and then there is a power chip 11 that may convert 220V ac power into 50V dc power, and those skilled in the art can understand that the specific configuration of the power chip 11 may be selected according to actual requirements, which is not limited herein.

Further, the primary winding 12 refers to a winding that receives power from a power supply under an operating condition, in this embodiment, the BUCK switching power supply 10 outputs a low-voltage dc power supply after voltage reduction through the primary winding 12, where the number of coils, winding coefficients, and the like of the primary winding 12 can be selected according to requirements, and a specific implementation manner of the primary winding is not limited herein.

Next, the primary winding 12 is respectively connected to the operating circuit 40 and the voltage-reducing circuit 30, so as to provide the operating circuit 40 and the voltage-reducing circuit 30 with electric energy required for normal operation, in this embodiment, the operating circuit 40 may include, for example, a fan and an IGBT driving circuit, and may further include, for example, a safety detection circuit, etc., which is not limited herein.

Further, the voltage-reducing circuit 30 is connected to the motherboard chip 50, wherein the motherboard chip 50 requires less power, and therefore the voltage-reducing circuit 30 is configured to further reduce the power provided by the primary winding 12, so as to provide the power required by the motherboard chip, wherein the voltage-reducing circuit 30 may include, for example, a voltage-reducing resistor, and may further include, for example, a voltage-reducing diode, and the like, which is not limited in this embodiment as long as the function of reducing the voltage can be implemented.

In the present embodiment, the primary winding 12 and the secondary winding 20 are further provided to form a transformer for transforming the power provided by the primary winding 12 to obtain the power for the display panel 60 to operate, and specifically, the secondary winding 20 is connected to the display panel 60 for providing the power obtained after transforming the power to the display panel 60, so as to power the display panel 60 to operate normally.

In the present embodiment, the primary winding 12 supplies power to the motherboard chip 50 through the voltage dropping circuit 30, and the primary winding 12 and the secondary winding 20 form a transformer, so that the power output by the secondary winding 20 supplies power to the display panel 60, wherein the motherboard chip 50 and the display panel 60 are supplied with power from different sources, so that the isolation between the motherboard chip 50 and the display panel 60 is realized without adding windings.

Optionally, the BUCK switching power supply 10 may further include devices such as a diode, a capacitor, and a resistor, for example, and those skilled in the art can understand that a specific implementation manner of the BUCK switching power supply 10 may be selected according to actual requirements, and the circuit device and the connection manner of the BUCK switching power supply 10 in this embodiment are not limited.

The utility model provides a power supply isolation power supply circuit, include: a BUCK switching power supply 10, a secondary winding 20, a voltage step-down circuit 30, an operating circuit 40, a main board chip 50, and a display panel 60; the BUCK switching power supply 10 comprises a power supply chip 11 and a primary winding 12; the primary winding 12 and the secondary winding 20 form a transformer, the primary winding 12 is respectively connected with the working circuit 40 and the voltage reduction circuit 30, and the voltage reduction circuit 30 is connected with the mainboard chip 50; the secondary winding 20 is connected to the display panel 60. The electric energy output by the primary winding 12 is supplied to the main board chip 50 through the voltage reduction circuit 30, then the primary winding 12 and the secondary winding 20 are arranged to form a transformer, the electric energy output by the secondary winding 20 is supplied to the display board 60, isolation between the main board chip 50 and the display board 60 is achieved based on the original primary winding 12 of the BUCK switch power supply 10, the problem that cost is high due to the fact that the winding is added to achieve isolation is avoided, and manufacturing cost of the induction cooker is reduced.

On the basis of the above embodiment, it is right below with reference to fig. 3 that the utility model provides a power supply isolation power supply circuit introduces in further detail, and fig. 3 is the utility model provides a power supply isolation power supply circuit's structure schematic diagram two, as shown in fig. 3:

the power chip 11 is provided with a control circuit 111 and a switch tube 112, and the BUCK switch power supply 10 further comprises a diode D109 and a capacitor C120;

one end of the diode D109 is connected to the switching tube 112 and the other end of the primary winding 12, respectively, and the other end is grounded;

one end of the capacitor C120 is grounded, and the other end is connected to one end of the primary winding 12 and the voltage step-down circuit 30.

Specifically, referring to fig. 3, a control circuit 111 composed of a diode D3 and a capacitor C111 is disposed in the power chip 11, wherein one end of the control circuit 111 is connected to the high-voltage ac power supply, the other end is grounded, and the switching tube 112 is connected to the control circuit 111.

Further, the BUCK switching power supply 10 further includes a diode D109 and a capacitor C120, as shown in fig. 3, one end of the diode D109 is connected to the switching tube 112 and the pin 1 of the primary winding 12, respectively, and the other end is grounded to GND.

Next, one end of the capacitor C120 is grounded to GND, and the other end is connected to pin 1 of the primary winding 12 and the voltage step-down circuit 30.

Optionally, the BUCK switching power supply 10 may further include other diodes and capacitors, so that power conversion can be implemented more quickly and effectively to improve the working efficiency, and those skilled in the art can understand that the circuit of the BUCK switching power supply 10 shown in fig. 3 is only one possible design manner, and the specific implementation of the BUCK switching power supply 10 in this embodiment is not limited, as long as power conversion can be implemented.

In this embodiment, the control circuit 111 is arranged to connect the high-voltage ac power supply, and then the switching tube 112 controls each circuit device in the switching power supply to reduce voltage and convert ac into dc, specifically, the diode D109 and the capacitor C120 are used to convert the high-voltage ac power supply into low-voltage dc power supply, wherein the circuit devices of the diode and the capacitor are simple in design and easy to implement, and the design complexity of the circuit can be reduced.

In the present embodiment, one end of the primary winding 12 is grounded to the motherboard chip 50, and the other end of the primary winding 12 is connected to the power supply chip 11;

one end of the secondary winding 20 is connected to the display panel 60, and the other end of the secondary winding 20 is grounded and is common to the display panel 60.

Specifically, referring to fig. 3, the pin 1 of the primary winding 12 is connected to a ground GND, wherein the main board chip 50 is also connected to the ground GND, i.e., the end provided with the primary winding 12 is grounded to the main board chip 50.

Further, the pin 2 of the primary winding 12 is connected to the power chip 11, wherein the power chip 11 is connected to a high voltage AC power source AC, and a low voltage dc power source, i.e., VDD shown in fig. 3, is output from the pin 1 of the primary winding 12 through the process of the BUCK switching power source 10, thereby supplying power to the operating circuit 40 and the main board chip 50.

Next, the primary winding 12 and the secondary winding 20 form a transformer, transforming the low voltage dc power outputted through the primary winding 12 to obtain power that can satisfy the operation of the interface display panel 60, thereby supplying power to the interface display panel 60.

Specifically, referring to fig. 3, the 4-pin of the secondary winding 20 is connected to the display panel 60 via the rectifying, filtering and stabilizing circuit 70, and the 3-pin of the secondary winding 20 is connected to the ground GND1, wherein the display panel 60 is also connected to the ground GND1, i.e., the secondary winding 20 is common to the display panel 60.

In the present embodiment, one end of the primary winding 12 is connected to the ground GND in common with the main board chip 50, and the secondary winding 20 is connected to the ground GND1 in common with the display panel 60, wherein the main board chip 50 and the display panel 60 are connected to different grounds, so that the grounds can be separately set when the main board chip 50 and the display panel 60 are set, thereby more effectively achieving the isolation between the main board chip 50 and the display panel 60.

In the present embodiment, one end of the rectifying filter voltage stabilizing circuit 70 is connected to one end of the secondary winding 20, and the other end of the rectifying filter voltage stabilizing circuit 70 is connected to the display panel 60.

Specifically, the rectifying, filtering and stabilizing circuit 70 is used for rectifying and filtering the power output from the secondary winding 20, so as to obtain a smooth power for the display panel 60 to work normally.

Optionally, fig. 3 exemplarily shows a possible implementation manner of the rectifying, filtering and voltage stabilizing circuit 70, as shown in fig. 3, the rectifying, filtering and voltage stabilizing circuit 70 includes a diode D117, a capacitor C112, and a chip IC6 to implement the functions of rectification and filtering, where the rectifying, filtering and voltage stabilizing circuit 70 may further include a rectifier bridge, for example, and the present embodiment does not limit a specific implementation manner of the rectifying, filtering and voltage stabilizing circuit 70.

Further, in the present embodiment, the number of turns of the primary winding 12 is larger than that of the secondary winding 20.

Specifically, the electric energy required by the display panel 60 during normal operation is small, and therefore, in the present embodiment, the number of turns of the primary winding 12 is set to be greater than the number of turns of the secondary winding 20, so that the voltage reduction function of the transformer formed by the primary winding 12 and the secondary winding 20 is realized, the normal operation of the display panel 60 is satisfied, and the waste of the electric energy is avoided.

Further, in the present embodiment, the operating circuit 40 includes a fan and an IGBT driving circuit.

The fan is a working unit arranged inside the induction cooker and used for dissipating heat when the induction cooker normally works, functions such as cooling of devices inside the induction cooker are achieved after the induction cooker stops working, and normal work of the fan can be guaranteed through the fan driving circuit.

Further, an Insulated Gate Bipolar Transistor (IGBT) is a composite fully-controlled voltage-driven power semiconductor device composed of a Bipolar Transistor and an Insulated Gate field effect Transistor (MOS Transistor), wherein the IGBT driving circuit is used for realizing normal operations of heating, timing, and the like of the induction cooker.

Optionally, the working circuit 40 may further include, for example, a buzzer alarm circuit, a current detection circuit, a voltage detection circuit, etc., and specific contents thereof may be set according to actual requirements, and all circuit units inside the induction cooker for enabling the induction cooker to normally work may be set as the working circuit.

In this embodiment, can set up work circuit 40 and be connected with VDD, thereby convert high-voltage ac power into low-voltage dc power through power chip 11 and primary winding 12, secondly, the power after the one end output conversion through primary winding 12, so that fan and IGBT drive circuit can get electric normal work, secondly, step-down resistance R150 further steps down the direct current of primary winding 12 output, to mainboard chip 50 output can satisfy its electric energy of normal work, thereby the waste of electric energy has been avoided, and can be fast effectual realization step-down function through step-down resistance R150, and practice thrift the cost of manufacture of electromagnetism stove.

Further, the number of turns of the primary winding 12 is greater than that of the secondary winding 20, so that the voltage reduction of the transformer formed by the primary winding 12 and the secondary winding 20 is realized, the secondary winding 20 outputs a power supply which can meet the requirement of the work of a display panel, and the waste of electric energy is avoided.

The power supply circuits of the main board chip 50 and the display panel 60 are different, and the grounded grounding ends are also different, so that the isolation of the main board chip 50 and the display panel 60 can be realized, wherein the primary winding 12 is the original component of the BUCK switching power supply 10, and the function of outputting the power supply is realized by arranging the primary winding 12, so that the problem of increasing the manufacturing cost caused by increasing the winding is avoided, and the manufacturing resources are saved.

In the present embodiment, the voltage-reducing circuit 30 includes a voltage-reducing resistor R150, one end of the voltage-reducing resistor R150 is connected to one end of the primary winding 12, and the other end of the voltage-reducing resistor R150 is connected to the motherboard chip 50.

Specifically, referring to fig. 3, the voltage-reducing circuit 30 is provided with a voltage-reducing resistor R150, wherein one segment of the voltage-reducing resistor R150 is connected to pin 1 of the primary winding 12 and is configured to receive the low-voltage dc power output from the primary winding 12, and then the voltage-reducing resistor R150 further reduces the voltage of the low-voltage dc power VDD output from the primary winding 12, so as to supply power to the motherboard chip 50 connected to the other end.

The specific resistance parameter of the voltage-reducing resistor R150 can be selected according to the power parameter required by the motherboard chip 50, which is not limited in this embodiment.

The voltage reduction resistor R150 is provided in the embodiment, so that the direct current output by the primary winding 12 is further reduced in voltage, and the power is supplied to the motherboard chip 50, wherein the cost of the voltage reduction resistor is low, and the logic for reducing the voltage is simple and easy to implement.

Further, in this embodiment, the power isolation and supply circuit further includes: one end of the filtering and voltage stabilizing circuit 80 is connected with the voltage reducing circuit 30, and the other end of the filtering and voltage stabilizing circuit 80 is connected with the mainboard chip 50.

Specifically, the filtering and voltage stabilizing circuit 80 is used for filtering and stabilizing the voltage output by the voltage reducing circuit 30 after voltage reduction, and referring to fig. 3, the filtering and voltage stabilizing circuit 80 includes a capacitor C129, a capacitor C118 and a chip IC5, wherein the capacitor C129 and the capacitor C118 are both used for filtering the power supply, so as to eliminate a specific frequency band of the power supply and suppress and prevent interference of the circuit.

Optionally, the capacitance value of the capacitor C129 is greater than the capacitance value of the capacitor C118, in this embodiment, the power supply after filtering by the capacitor C129 is used to meet the normal operation of the operating circuit 40, and the power supply after filtering by the capacitor C118 is used to meet the normal operation of the motherboard chip 60, where the voltage required by the normal operation of the motherboard chip 60 is less than the voltage required by the normal operation of the operating circuit 40, so that the capacitance value of the capacitor C129 is set to be greater than the capacitance value of the capacitor C118, and the capacitor C129 can also be used for storing energy.

Further, the chip IC5 may be used to implement voltage stabilization of the power supply, and then the power supply processed by the filtering and voltage stabilizing circuit 80 is output to the motherboard chip 50, so that the motherboard chip 50 is powered on to operate normally.

Those skilled in the art will appreciate that the filtering voltage stabilizing circuit 80 shown in fig. 3 is only one possible implementation manner, wherein the filtering voltage stabilizing circuit 80 may further include, for example, a resistor, a transistor, etc., and the specific implementation manner of the filtering voltage stabilizing circuit 80 is not particularly limited in this embodiment.

The power supply isolation power supply circuit provided by the embodiment comprises: the rectifying, filtering and voltage stabilizing circuit 70 and the filtering and voltage stabilizing circuit 80 are arranged, one end of the rectifying, filtering and voltage stabilizing circuit 70 is connected with one end of the secondary winding 20, the other end of the rectifying, filtering and voltage stabilizing circuit 70 is connected with the display panel 60, one end of the filtering and voltage stabilizing circuit 80 is connected with the voltage reduction circuit 30, the other end of the filtering and voltage stabilizing circuit is connected with the main board chip 50, and by arranging the rectifying, filtering and voltage stabilizing circuit 70 and the filtering and voltage stabilizing circuit 80, filtering and rectification of a power supply output by the primary winding 12 can be achieved, so that the power supply capable of meeting normal work.

The utility model also provides an electromagnetism stove, the electromagnetism stove includes as above embodiment the power supply keep apart power supply circuit.

Optionally, the display panel is provided with a socket for electrically connecting with a pot.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. A power isolated supply circuit, comprising: the BUCK switching power supply comprises a BUCK switching power supply (10), a secondary winding (20), a voltage reduction circuit (30), a working circuit (40), a main board chip (50) and a display board (60); the BUCK switching power supply (10) comprises a power supply chip (11) and a primary winding (12); wherein

The primary winding (12) and the secondary winding (20) form a transformer, the primary winding (12) is respectively connected with the working circuit (40) and the voltage reduction circuit (30), and the voltage reduction circuit (30) is connected with the mainboard chip (50);

the secondary winding (20) is connected to the display panel (60).

2. The power supply isolation supply circuit according to claim 1, wherein one end of the primary winding (12) is grounded to the main board chip (50), and the other end of the primary winding (12) is connected to the power supply chip (11);

one end of the secondary winding (20) is connected to the display panel (60), and the other end of the secondary winding (20) is grounded and is common to the display panel (60).

3. The power supply isolation power supply circuit according to claim 2, wherein the voltage reduction circuit (30) comprises a voltage reduction resistor R150, one end of the voltage reduction resistor R150 is connected with one end of the primary winding (12), and the other end of the voltage reduction resistor R150 is connected with the main board chip (50).

4. The mains isolated supply circuit according to any of claims 1 to 3, wherein the primary winding (12) has a greater number of turns than the secondary winding (20).

5. The power isolated supply circuit of claim 1, further comprising: and one end of the rectifying, filtering and voltage stabilizing circuit (70) is connected with one end of the secondary winding (20), and the other end of the rectifying, filtering and voltage stabilizing circuit (70) is connected with the display panel (60).

6. The power supply isolation power supply circuit according to any one of claims 1 to 3, wherein a control loop (111) and a switch tube (112) are arranged in the power supply chip (11), and the BUCK switch power supply (10) further comprises a diode and a capacitor;

one end of the diode is respectively connected with the other ends of the switching tube (112) and the primary winding (12), and the other end of the diode is grounded;

one end of the capacitor is grounded, and the other end of the capacitor is connected with one end of the primary winding (12) and the voltage reduction circuit (30).

7. The power isolated supply circuit of claim 1, further comprising: and one end of the filtering and voltage stabilizing circuit (80) is connected with the voltage reducing circuit (30), and the other end of the filtering and voltage stabilizing circuit (80) is connected with the mainboard chip (50).

8. The mains isolated supply circuit according to any of claims 1-3, 5, 7, wherein the operating circuit (40) comprises a fan and an IGBT driver circuit.

9. An induction cooker, characterized in that the induction cooker comprises a power supply isolation power supply circuit according to any one of claims 1 to 8.

10. The induction cooker according to claim 9, wherein the display panel is provided with a socket for electrically connecting with a pot.