Switching power supply circuit of induction cooker

Abstract

The utility model relates to the technical field of switching power supplies, and discloses a switching power supply circuit of an induction cooker, which efficiently converts alternating current into direct current through the design of a bridge rectifier circuit, so that direct current output signals are smoother, more stable direct current output voltage is provided, and the current is allowed to pass through both positive and negative half cycles of input alternating current signals. The power consumption is reduced; through the design of the peak absorption circuit, the voltage peak generated in the switching power supply is absorbed, other elements in the power supply are prevented from being damaged, and the reliability and the stability of the power supply are improved; through the design of the high-frequency switching circuit, smaller transformers and filters are allowed to be used, so that the size of the power supply is reduced, and the conversion efficiency of the power supply is improved; through the design of the precise voltage stabilizing circuit, it is ensured that the output voltage is kept stable within a certain range and is not affected by input voltage or load changes, and other elements in the power supply can be protected from being affected by voltage fluctuation.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of switching power supply, concretely is a kind of electromagnetic range switching power supply circuit. BACKGROUND

[0002] Switching power supply is a kind of modern power electronics technology, through the control switch tube opens and shuts off the time ratio, to maintain stable output voltage power supply device.Electromagnetic range switching power supply is the important component of electromagnetic range, it is responsible for the conversion of input ac into the dc required by electromagnetic range, to supply the normal work of each part of electromagnetic range.

[0003] Switching tube is driven under the control circuit, opens and shuts off high speed, converts direct current into high-frequency pulsating direct current, and then voltage conversion is carried out through transformer, obtains the various voltage grades required by electromagnetic range.

[0004] Through the search, the patent with application No.CN202010082079.2 discloses a kind of switching power supply circuit, it has in overloading state can supply stable output voltage, and when eliminating overloading state, overcurrent protection function can make output voltage instantaneously restore to normal state.The switching power supply circuit of embodiment compares reference voltage with the feedback voltage of output voltage, and controls the output voltage according to the reference voltage, in the case where output current exceeds the specified set current, the potential of the reference voltage is reduced.

[0005] The direct current output signal generated by the current switching power supply circuit is not smooth enough, has more corrugation, reduces the stability of direct current voltage output, and the power consumption is higher;And voltage peak in power supply will damage the components in power supply, reduce the reliability and stability of power supply, the existing switching power supply is large in size, cannot effectively control the switch of current, reduces the conversion efficiency of power supply, therefore we need to propose a kind of electromagnetic range switching power supply circuit. UTILITY MODEL CONTENT

[0006] The utility model discloses a purpose lies in providing a kind of electromagnetic oven switching power supply circuit, by the design of bridge rectifier circuit, AC is converted into DC with high efficiency, make that DC output signal is more smooth, provide more stable DC output voltage, allow current to pass in the positive and negative half cycle of input AC signal, to reduce power consumption;By the design of spike absorption circuit, the voltage spike generated in switching power supply is absorbed, to prevent its damage other elements in power supply, help to improve the reliability and stability of power supply;By the design of high-frequency switching circuit, allow to use smaller transformer and filter, to reduce the volume of power supply, more effectively control the switch of current, to improve the conversion efficiency of power supply;By the design of precision voltage stabilizing circuit, ensure that output voltage remains stable within a certain range, is not influenced by input voltage or load variation, help to protect other elements in power supply from the influence of voltage fluctuation, prolong its service life;By 15V and 5V two kinds of output voltage, meet the different needs of voltage for different equipment, to solve the problem proposed in the above background technology.

[0007] To achieve the above object, the utility model provides the following technical scheme: a kind of electromagnetic oven switching power supply circuit, comprising:

[0008] Bridge rectifier circuit that AC is converted into DC;

[0009] Spike absorption circuit that protects power supply stability and improves system stability;

[0010] High-frequency switching circuit that the current and voltage between input and output are adjusted by the fast switching of switch tube;

[0011] Precision voltage stabilizing circuit that maintains output voltage stable, and is not influenced by input voltage variation and load variation factor;

[0012] 15V output circuit and 5V output circuit that provide required power supply voltage for different electronic equipment or circuit;

[0013] The bridge rectifier circuit, spike absorption circuit, high-frequency switching circuit are sequentially connected, and the 15V output circuit and 5V output circuit are parallelly connected on one side of high-frequency switching circuit, and the precision voltage stabilizing circuit is electrically connected with high-frequency switching circuit and 5V output circuit respectively.

[0014] Preferably, the bridge rectifier circuit includes a bridge rectifier BD1 connected to the input terminal live wire and zero line, the 1 pin of the bridge rectifier BD1 is connected to the zero line, the 2 pin of the bridge rectifier BD1 is connected with a fuse FS2, the fuse FS2 is connected to the live wire, and the 2 pin of the bridge rectifier BD1 is connected with a grounded capacitor EC2.

[0015] Preferably, the spike absorption circuit includes resistors R9, R10 and capacitor C7 arranged in parallel, and the connection terminals at one end of the resistors R9, R10 and capacitor C7 are connected to pin 2 of the bridge rectifier BD1, and the connection terminals at the other end of the resistors R9, R10 and capacitor C7 are connected in series with resistor R11 and diode D9.

[0016] Preferably, the high-frequency switching circuit includes transformer T1 and chip U1, and the connection terminals at one end of the resistors R9, R10 and capacitor C7 are also connected to pin 1 of the transformer T1, and one end of the diode D9 is connected to pin 3 of the transformer T1 and the connection terminals at pins 5, 6, 7 and 8 of the chip U1, respectively.

[0017] Preferably, the precise voltage stabilizing circuit includes optocoupler U2, pin 3 of the optocoupler U2 is connected to pin 3 of the chip U1, pin 4 of the optocoupler U2 is connected to pin 4 of the chip U1, resistor R17 is connected between pins 1 and 2 of the optocoupler U2, resistor R15 is connected to pin 1 of the optocoupler U2, diode U3 is connected to pin 2 of the optocoupler U2, pin 3 of the diode U3 is connected to pin 10 of the transformer T1, resistor R24 and capacitor C19 are connected between pins 1 and 2 of the diode U3.

[0018] Preferably, the 15V output circuit includes diode D11 connected to pin 6 of the transformer T1, resistor R13 and capacitor C8 connected in series between the two ends of the diode D11, and capacitor EC7 connected to the ground, capacitor C17 and resistor R16 arranged in parallel connected to one end of the diode D11.

[0019] Preferably, the 5V output circuit includes diode D12 connected to pin 8 of the transformer T1, and capacitor EC5, resistor R5, capacitor C16, capacitor EC6, inductor L8 and diode ZD1 connected in series, capacitor EC1 and capacitor C14 arranged in parallel connected between the diode D12 and pin 10 of the transformer T1, and resistor R14 and capacitor C9 connected in series between the two ends of the diode D12.

[0020] Preferably, resistor R22 and resistor R23 are connected to pin 1 of the diode U3, respectively, resistor R15 is connected to one end of the inductor L8, and one end of the resistor R22 is connected to the other end of the inductor L8.

[0021] Compared with the prior art, the utility model has the advantages of:

[0022] 1. The utility model discloses a bridge rectifier circuit design, efficient conversion of alternating current into direct current, make direct current output signal more smooth, provide more stable direct current output voltage, allow current to pass in the positive and negative half cycle of input alternating current signal, thereby reduce the power consumption;

[0023] 2. The utility model discloses a spike absorption circuit design, absorption switch power supply voltage spike, prevent its damage other elements in power supply, help to improve the reliability and stability of power supply;

[0024] 3. The utility model discloses a high-frequency switching circuit design, allow to use smaller transformer and filter, thereby reduce the volume of power supply, more effectively control the switch of current, thereby improve the conversion efficiency of power supply;

[0025] 4. The utility model discloses a precision voltage stabilizing circuit design, ensure that output voltage keeps stable in a certain range, is not influenced by input voltage or load change, help to protect other elements in power supply from the influence of voltage fluctuation, prolong its service life. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the circuit diagram of the utility model;

[0027] Figure 2 It is the circuit diagram of bridge rectifier circuit and spike absorption circuit of the utility model;

[0028] Figure 3 It is the circuit diagram of high-frequency switching circuit of the utility model;

[0029] Figure 4 It is the circuit diagram of precision voltage stabilizing circuit of the utility model;

[0030] Figure 5 It is the circuit diagram of 15V output circuit of the utility model;

[0031] Figure 6 It is the circuit diagram of 5V output circuit of the utility model.

[0032] Figure 7 It is the system block diagram of the utility model. DETAILED DESCRIPTION

[0033] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0034] Please refer to Figures 1-7 The utility model provides a technical scheme: an induction cooker switching power supply circuit, it includes:

[0035] Bridge rectifier circuit that converts alternating current into direct current;

[0036] The bridge rectifier circuit includes bridge rectifier BD1 connected with input end live wire and zero line, the 1 foot of bridge rectifier BD1 is connected on zero line, the 2 foot of bridge rectifier BD1 is connected with fuse FS2, the fuse FS2 is connected on live wire, the 2 foot of bridge rectifier BD1 is connected with the earthed capacitor EC2, and the rated 20A and 250V of fuse FS2 protect the circuit from overload or short circuit.

[0037] Bridge rectifier BD1 is used to convert alternating current input into direct current, and capacitor EC2 and capacitor C7 are used to smooth the direct current output after rectification and reduce power fluctuation.

[0038] The peak absorption circuit is used to protect power stability and improve system stability.

[0039] The peak absorption circuit includes resistance R9, resistance R10 and capacitor C7 arranged in parallel, one end of resistance R9, resistance R10 and capacitor C7 is connected to the 2 foot of bridge rectifier BD1, and resistance R11 and diode D9 are connected in series on the other end of resistance R9, resistance R10 and capacitor C7.

[0040] Resistance R9 and resistance R10 are used for current limiting and voltage dividing to ensure safe operation of the circuit, resistance R11 acts as a load, and diode D9 is a voltage stabilizing diode used to prevent the output voltage from being too high.

[0041] The high-frequency switching circuit adjusts the current and voltage between the input and output through the rapid switching of the switching tube.

[0042] The high-frequency switching circuit includes transformer T1 and chip U1, one end of resistance R9, resistance R10 and capacitor C7 is also connected to the 1 foot of transformer T1, and one end of diode D9 is connected to the 3 foot of transformer T1 and the wiring terminals of the 5 foot, 6 foot, 7 foot and 8 foot of chip U1 respectively.

[0043] Transformer T1 is responsible for reducing alternating high voltage to appropriate low voltage (usually 5V) and providing power supply for the subsequent circuit, chip U1 is a regulator integrated circuit, usually LM7805 series, which automatically adjusts the output voltage according to the load, and capacitor C15 is used to stabilize the voltage.

[0044] The precision voltage stabilizing circuit keeps the output voltage stable and is not affected by input voltage changes and load changes.

[0045] The precision voltage stabilizing circuit includes an optical coupling U2 for isolation and signal transmission, the 3-pin of the optical coupling U2 is connected with the 3-pin of the chip U1, the 4-pin of the optical coupling U2 is connected with the 4-pin of the chip U1, the 1-pin and 2-pin of the optical coupling U2 are connected with the resistance R17, the 1-pin of the optical coupling U2 is connected with the resistance R15, the 2-pin of the optical coupling U2 is connected with the diode U3, the 3-pin of the diode U3 is connected with the 10-pin of the transformer T1, the 1-pin and 2-pin of the diode U3 are connected with the resistance R24 and the capacitor C19.

[0046] The 1-pin of the diode U3 is connected with the resistance R22 and the resistance R23 respectively, the resistance R15 is connected with one end of the inductor L8, one end of the resistance R22 is connected with the other end of the inductor L8.

[0047] The 15V output circuit and the 5V output circuit are provided for different electronic devices or circuits to provide the required power supply voltage;

[0048] The 15V output circuit includes the diode D11 connected with the 6-pin of the transformer T1, the resistance R13 and the capacitor C8 are connected in series between the two ends of the diode D11, the one end of the diode D11 is further connected with the ground capacitor EC7, the capacitor C17 and the resistance R16 arranged in parallel.

[0049] The 5V output circuit includes the diode D12 connected with the 8-pin of the transformer T1, the capacitor EC5, the resistance R5, the capacitor C16, the capacitor EC6, the inductor L8 and the diode ZD1 connected in series, the capacitor EC1 and the capacitor C14 connected in parallel are connected between the diode D12 and the 10-pin of the transformer T1, the resistance R14 and the capacitor C9 are connected in series between the two ends of the diode D12. The diodes ZD1 and ZD2 are both Zener diodes for overvoltage protection, the inductor L8 is used for filtering, and the capacitor reduces high-frequency noise. +5V OUT: the final output end, providing stable 5V DC for driving loads such as microcontrollers, etc.

[0050] The diodes D11 and D12 are rectifier diodes to ensure that the AC signal output by the transformer is converted to DC, preventing reverse current flow, the capacitors C8 and C9 are used for filtering and smoothing voltage output, and the resistance R13 is used for current limiting in the entire current,

[0051] The bridge rectifier circuit, the peak absorption circuit and the high-frequency switching circuit are connected in sequence, the 15V output circuit and the 5V output circuit are connected in parallel on one side of the high-frequency switching circuit, and the precision voltage stabilizing circuit is electrically connected with the high-frequency switching circuit and the 5V output circuit respectively.

[0052] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An electromagnetic induction cooker switching power supply circuit, characterized in that, The utility model relates to a kind of power supply stabilizer, including: Bridge rectifier circuit for converting alternating current into direct current; Peak absorption circuit for protecting power supply stability and improving system stability; High-frequency switching circuit for adjusting current and voltage between input and output by fast switching of switching tube; Precise voltage stabilizing circuit for keeping output voltage stable and not affected by input voltage variation and load variation factors; 15V output circuit and 5V output circuit for providing required power supply voltage for different electronic devices or circuits; The bridge rectifier circuit, peak absorption circuit, high-frequency switching circuit are connected in sequence, and the 15V output circuit and 5V output circuit are connected in parallel on one side of the high-frequency switching circuit, and the precise voltage stabilizing circuit is electrically connected with the high-frequency switching circuit and 5V output circuit respectively.

2. The switching power supply circuit for an electromagnetic cooking range according to claim 1, wherein: The bridge rectifier circuit includes a bridge rectifier BD1 connected to the input live wire and neutral wire, the 1-pin of the bridge rectifier BD1 is connected to the neutral wire, a fuse FS2 is connected to the 2-pin of the bridge rectifier BD1, the fuse FS2 is connected to the live wire, and a grounded capacitor EC2 is connected to the 2-pin of the bridge rectifier BD1.

3. The induction cooker switching power supply circuit according to claim 2, characterized in that: The peak absorption circuit includes resistors R9, R10 and a capacitor C7 connected in parallel, and the connection terminals at one end of the resistors R9, R10 and capacitor C7 are connected to the 2-pin of the bridge rectifier BD1, and the connection terminals at the other end of the resistors R9, R10 and capacitor C7 are connected in series with a resistor R11 and a diode D9.

4. The switching power supply circuit of an electromagnetic induction cooker according to claim 3, wherein: The high-frequency switching circuit includes a transformer T1 and a chip U1, the connection terminals at one end of the resistors R9, R10 and capacitor C7 are also connected to the 1-pin of the transformer T1, and one end of the diode D9 is connected to the connection terminals of the 3-pin of the transformer T1 and the 5-pin, 6-pin, 7-pin and 8-pin of the chip U1, respectively.

5. The switching power supply circuit of an electromagnetic induction cooker according to claim 4, wherein: The precise voltage stabilizing circuit includes an optocoupler U2, the 3-pin of the optocoupler U2 is connected to the 3-pin of the chip U1, the 4-pin of the optocoupler U2 is connected to the 4-pin of the chip U1, a resistor R17 is connected between the 1-pin and 2-pin of the optocoupler U2, a resistor R15 is connected to the 1-pin of the optocoupler U2, a diode U3 is connected to the 2-pin of the optocoupler U2, the 3-pin of the diode U3 is connected to the 10-pin of the transformer T1, and a resistor R24 and a capacitor C19 are connected between the 1-pin and 2-pin of the diode U3.

6. The switching power supply circuit of an electromagnetic induction cooker according to claim 5, wherein: The 15V output circuit includes a diode D11 connected to the 6-pin of the transformer T1, the diode D11 is connected in series with a resistor R13 and a capacitor C8 between its two ends, and the diode D11 is also connected to a grounded capacitor EC7, a capacitor C17 and a resistor R16 connected in parallel.

7. The switching power supply circuit of an electromagnetic induction cooker according to claim 6, wherein: The 5V output circuit includes a diode D12 connected to the 8-pin of the transformer T1, and the diode D12 is connected with a capacitor EC5, a resistor R5, a capacitor C16, a capacitor EC6 connected in parallel, and an inductor L8 and a diode ZD1, a capacitor EC1 and a capacitor C14 connected in series between the 10-pin of the transformer T1, and the diode D12 is connected in series with a resistor R14 and a capacitor C9 between its two ends.

8. The switching power supply circuit of an electromagnetic induction cooker according to claim 7, wherein: The pin 1 of the diode U3 is connected with the resistor R22 and the resistor R23 respectively, the resistor R15 is connected at one end of the inductor L8, one end of the resistor R22 is connected at the other end of the inductor L8.

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