CN209805400U - Power output protection circuit and electromagnetism stove - Google Patents
Power output protection circuit and electromagnetism stove Download PDFInfo
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- CN209805400U CN209805400U CN201822134210.6U CN201822134210U CN209805400U CN 209805400 U CN209805400 U CN 209805400U CN 201822134210 U CN201822134210 U CN 201822134210U CN 209805400 U CN209805400 U CN 209805400U
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Abstract
The embodiment of the utility model provides a power output protection circuit and electromagnetism stove, power output protection circuit includes: the protection circuit comprises a switching power supply (10), a first protection circuit (20), a second protection circuit (30) and a control system (40), wherein the first protection circuit (20) is respectively connected with the switching power supply (10) and the second protection circuit (30), and the second protection circuit (30) is also connected with the control system (40); the high-voltage protection circuit is used for controlling the voltage output to the control system (40) by the switching power supply (10) to be less than or equal to a first preset voltage, the low-voltage protection circuit is used for controlling the voltage output to the control system (40) by the switching power supply (10) to be greater than or equal to a second preset voltage, and the first preset voltage is greater than the second preset voltage. The reliability of the voltage output by the switching power supply (10) is improved.
Description
Technical Field
The utility model relates to a household electrical appliances technical field especially relates to a power output protection circuit and electromagnetism stove.
Background
An induction cooker is a common household appliance for heating. The induction cooker is generally provided with a switching power supply and a control system, wherein the switching power supply is used for supplying power to the control system, and the control system is used for controlling the induction cooker.
in the prior art, a switching power supply can process commercial power to obtain direct current and provide the direct current for a control system. However, in practical applications, the voltage output by the switching power supply cannot be stabilized at a constant value, when the voltage output by the switching power supply is greater than the maximum withstand voltage of the control system, the control system may be damaged, and when the voltage output by the switching power supply is less than the minimum operating voltage of the control system, the control system cannot operate normally. As can be seen from the above, the switching power supply in the prior art has poor reliability of the output voltage.
SUMMERY OF THE UTILITY MODEL
the embodiment of the utility model provides a power output protection circuit and electromagnetism stove have improved the reliability of switching power supply output's voltage.
In a first aspect, an embodiment of the present invention provides a power output protection circuit, including: a switching power supply 10, a first protection circuit 20, a second protection circuit 30, and a control system 40, wherein,
The first protection circuit 20 is connected to the switching power supply 10 and the second protection circuit 30, the second protection circuit 30 is further connected to the control system 40, the first protection circuit 20 is a high-voltage protection circuit, and the second protection circuit 30 is a low-voltage protection circuit; or the first protection circuit 20 is the low-voltage protection circuit, and the second protection circuit 30 is the high-voltage protection circuit;
the high-voltage protection circuit is used for controlling the voltage output by the switching power supply 10 to the control system 40 to be less than or equal to a first preset voltage, the low-voltage protection circuit is used for controlling the voltage output by the switching power supply 10 to the control system 40 to be greater than or equal to a second preset voltage, and the first preset voltage is greater than the second preset voltage.
The utility model provides a power output protection circuit includes switching power supply 10, first protection circuit 20, second protection circuit 30 and control system 40, and first protection circuit 20 is connected with switching power supply 10 and second protection circuit 30 respectively, and second protection circuit 30 still is connected with control system 40, and first protection circuit 20 is high-voltage protection circuit, and second protection circuit 30 is low-voltage protection circuit; alternatively, the first protection circuit 20 is a low voltage protection circuit, and the second protection circuit 30 is a high voltage protection circuit. The high-voltage protection circuit is used for controlling the voltage output to the control system 40 by the switching power supply 10 to be less than or equal to a first preset voltage, the low-voltage protection circuit is used for controlling the voltage output to the control system 40 by the switching power supply 10 to be greater than or equal to a second preset voltage, and the first preset voltage is greater than or equal to the second preset voltage. Because the power output protection circuit comprises the first protection circuit 20 and the second protection circuit 30, the first protection circuit 20 and the second protection circuit 30 can enable the voltage output to the control system 40 by the switching power supply 10 to be between the second preset voltage and the first preset voltage, thereby avoiding the phenomenon that the switching power supply 10 outputs too high or too low voltage to the control system 40, avoiding the damage of the too high voltage to the control system 40 and the problem that the control system 40 cannot work normally due to the too low voltage, and improving the reliability of the voltage output by the switching power supply 10.
in one possible design, the high voltage protection circuit includes a voltage stabilization part 201, wherein,
One end of the voltage stabilizing component 201 is connected to the switching power supply 10, the other end of the voltage stabilizing component 201 is grounded, and the voltage stabilizing component 201 is configured to be turned on when the voltage output by the switching power supply 10 is less than or equal to the first preset voltage.
In one possible design, the voltage regulation component 201 is a zener diode D, wherein,
The cathode of the voltage stabilizing diode D is connected with the switching power supply 10;
The anode of the voltage stabilizing diode D is grounded.
in one possible design, the voltage stabilizing component 201 is a voltage dependent resistor, wherein,
One end of the piezoresistor is connected with the switching power supply 10;
The other end of the piezoresistor is grounded.
In one possible design, the high voltage protection circuit further includes a current limiting component 202, wherein,
One end of the current limiting component 202 is connected to the switching power supply 10;
The other end of the current limiting part 202 is connected to the voltage stabilizing part 201.
In one possible design, the current limiting component 202 is a first resistor R1.
in one possible design, the low voltage protection circuit includes a transistor Q, wherein,
The grid electrode of the triode Q is connected with the switching power supply 10;
The drain of the triode Q is connected to the control system 40, and the source of the triode Q is grounded.
In one possible design, the low voltage protection circuit further includes a filter circuit 301, wherein one end of the filter circuit 301 is connected to the switching power supply 10, and the other end of the filter circuit 301 is connected to the control system 40.
In one possible design, the filter circuit 301 includes a second resistor R2 and a capacitor C, wherein,
One end of the second resistor R2 is connected to the switching power supply 10;
The other end of the second resistor R2 is respectively connected with one end of the capacitor C and the source of the triode Q;
The other end of the capacitor C is grounded.
In a second aspect, an embodiment of the present invention provides an induction cooker, which includes the power output protection circuit according to any one of the first aspect.
The utility model provides an electromagnetic oven includes switching power supply 10, first protection circuit 20, second protection circuit 30 and control system 40, and first protection circuit 20 is connected with switching power supply 10 and second protection circuit 30 respectively, and second protection circuit 30 still is connected with control system 40, and first protection circuit 20 is high-voltage protection circuit, and second protection circuit 30 is low-voltage protection circuit; alternatively, the first protection circuit 20 is a low voltage protection circuit, and the second protection circuit 30 is a high voltage protection circuit. The high-voltage protection circuit is used for controlling the voltage output to the control system 40 by the switching power supply 10 to be less than or equal to a first preset voltage, the low-voltage protection circuit is used for controlling the voltage output to the control system 40 by the switching power supply 10 to be greater than or equal to a second preset voltage, and the first preset voltage is greater than or equal to the second preset voltage. Because the power output protection circuit comprises the first protection circuit 20 and the second protection circuit 30, the first protection circuit 20 and the second protection circuit 30 can enable the voltage output to the control system 40 by the switching power supply 10 to be between the second preset voltage and the first preset voltage, thereby avoiding the phenomenon that the switching power supply 10 outputs too high or too low voltage to the control system 40, avoiding the damage of the too high voltage to the control system 40 and the problem that the control system 40 cannot work normally due to the too low voltage, and improving the reliability of the voltage output by the switching power supply 10.
The structure of the present invention and other objects and advantages thereof will be more clearly understood from the following description of the preferred embodiments taken in conjunction with the accompanying drawings.
drawings
Fig. 1 is a schematic structural diagram of a power output protection circuit according to the present invention;
Fig. 2 is a schematic structural diagram of a power output protection circuit according to the present invention;
fig. 3 is a schematic structural diagram of a power output protection circuit according to the present invention;
Fig. 4 is a schematic structural diagram of a power output protection circuit according to the present invention;
Fig. 5 is a schematic structural diagram of the power output protection circuit provided by the present invention.
Description of reference numerals:
10-a switching power supply;
20-a first protection circuit;
30-a second protection circuit;
40-a control system;
201-a voltage stabilizing component;
202-a flow-limiting component;
301-filter circuit.
Detailed Description
Fig. 1 is the utility model provides a power output protection circuit's structural schematic diagram one, as shown in fig. 1, this power output protection circuit includes: a switching power supply 10, a first protection circuit 20, a second protection circuit 30, and a control system 40, wherein,
The first protection circuit 20 is respectively connected with the switching power supply 10 and the second protection circuit 30, the second protection circuit 30 is also connected with the control system 40, the first protection circuit 20 is a high-voltage protection circuit, and the second protection circuit 30 is a low-voltage protection circuit; alternatively, the first protection circuit 20 is a low voltage protection circuit, and the second protection circuit 30 is a high voltage protection circuit.
The high-voltage protection circuit is used for controlling the voltage output to the control system 40 by the switching power supply 10 to be less than or equal to a first preset voltage, the low-voltage protection circuit is used for controlling the voltage output to the control system 40 by the switching power supply 10 to be greater than or equal to a second preset voltage, and the first preset voltage is greater than the second preset voltage.
The power output protection circuit provided by the embodiment can be applied to an electromagnetic heating device, and the electromagnetic heating device can be any device which is heated through electromagnetism. In the present embodiment, the electromagnetic heating apparatus is taken as an example of an electromagnetic oven, and the details will be described.
The electromagnetic heating circuit provided by the embodiment can be applied to an electromagnetic heating device, and the electromagnetic heating device can be any device which performs heating through electromagnetism. In the present embodiment, the electromagnetic heating apparatus is taken as an example of an electromagnetic oven, and the details will be described.
The induction cooker heats by applying a high-frequency electromagnetic induction principle, and by switching on and off an Insulated Gate Bipolar Transistor (IGBT), a resonance heating circuit generates resonance current, so that a coil panel of the resonance heating circuit generates a periodically-changed magnetic field, magnetic lines of force penetrate through a furnace surface through a magnetic loop formed by a coil and the bottom of a metal utensil to act on the bottom of the pot, heat is generated by using the short-circuit heat effect of low-resistance large current, eddy current is formed at the bottom of the pot to generate heat, and the effect of heating food in the utensil is achieved. The present embodiment does not particularly limit the implementation of the resonant heating circuit.
optionally, the IGBT is a composite fully-controlled voltage-driven power semiconductor device composed of a transistor Q and an insulated gate field effect transistor. The switching function of the IGBT is to apply forward grid voltage to form a channel, provide base current for the transistor and enable the IGBT to be conducted. And on the contrary, the reverse gate voltage is added to eliminate the channel, the base current is cut off, and the IGBT is turned off.
Alternatively, the switching power supply 10 may process the commercial power to obtain direct current, and provide the processed direct current to the control system 40.
Alternatively, the direct current is typically weak, and may be, for example, 5V, 18V, or the like.
Optionally, the rectification and filtering circuit 301 may first perform rectification and filtering on the commercial power, obtain 220V strong power after the rectification and filtering processing, and perform voltage reduction and other processing on the 220V strong power through the switching power supply 10 to obtain direct current weak power.
Optionally, the first protection circuit 20 and the second protection circuit 30 are configured to control the voltage output by the switching power supply 10 to the control system 40, so that the voltage output by the switching power supply 10 to the control system 40 is between the second preset voltage value and the first preset voltage. The first preset voltage is greater than the second preset voltage.
Alternatively, the first preset voltage may be a maximum operating voltage of the control system 40, that is, when the voltage output to the control system 40 is greater than the first preset voltage, damage may be caused to the control system 40.
Alternatively, the second preset voltage may be a minimum operating voltage of the control system 40, for example, the second preset voltage may be a starting voltage of the control system 40, that is, when the voltage output to the control system 40 is less than the second preset voltage, the control system 40 may not start to operate.
It should be noted that the voltage between the first preset voltage and the second preset voltage is a voltage that enables the control system 40 to operate normally.
optionally, one of the first protection circuit 20 and the second protection circuit 30 is a high voltage protection circuit, and the other is a low voltage protection circuit.
The high voltage protection circuit may control the output voltage of the switching power supply 10, so that the voltage output by the switching power supply 10 to the control system 40 is less than or equal to a first preset voltage.
the low voltage protection circuit may control the output voltage of the switching power supply 10, so that the voltage output by the switching power supply 10 to the control system 40 is greater than or equal to a second preset voltage.
Alternatively, when the first protection circuit 20 is a high-voltage protection circuit and the second protection circuit 30 is a low-voltage protection circuit, the schematic structural diagram of the power output protection circuit may be as shown in fig. 2.
fig. 2 is the utility model provides a power output protection circuit's structural schematic diagram two, as shown in fig. 2, high-voltage protection circuit is connected with switching power supply 10 and low-voltage protection circuit respectively, and low-voltage protection circuit still is connected with control system 40.
In the embodiment shown in fig. 2, the voltage output by the switching power supply 10 first passes through the high-voltage protection circuit, and if the voltage output by the switching power supply 10 is greater than the first preset voltage, the high-voltage protection circuit does not output the voltage output by the switching power supply 10 to the low-voltage protection circuit, so that the low-voltage protection circuit does not output the voltage output by the switching power supply 10 to the control system 40, and the control system 40 can be prevented from being damaged by the excessively high voltage. If the voltage output by the switching power supply 10 is less than or equal to the first preset voltage, the high-voltage protection circuit outputs the voltage output by the switching power supply 10 to the low-voltage protection circuit.
If the voltage output by the switching power supply 10 is greater than or equal to the second preset voltage, the low-voltage protection circuit outputs the voltage output by the switching power supply 10 to the control system 40, so that the voltage output to the control system 40 is between the second preset voltage and the first voltage, and the control system 40 can normally work. If the voltage output by the switching power supply 10 is less than the second preset voltage, the low voltage protection circuit does not output the voltage output by the switching power supply 10 to the control system 40, so as to prevent the control system 40 from performing an uncertain operation according to the too low voltage. The reliability of the voltage output by the switching power supply 10 is improved.
Alternatively, when the first protection circuit 20 is a low-voltage protection circuit and the second protection circuit 30 is a high-voltage protection circuit, the schematic structural diagram of the power output protection circuit may be as shown in fig. 3.
Fig. 3 is the utility model provides a power output protection circuit's structural schematic diagram is three, as shown in fig. 3, low pressure protection circuit is connected with switching power supply 10 and high-voltage protection circuit respectively, and high-voltage protection circuit still is connected with control system 40.
in the embodiment shown in fig. 2, the voltage output by the switching power supply 10 first passes through the low-voltage protection circuit, and if the voltage output by the switching power supply 10 is smaller than the second preset voltage, the low-voltage protection circuit does not output the voltage output by the switching power supply 10 to the high-voltage protection circuit, so that the high-voltage protection circuit does not output the voltage output by the switching power supply 10 to the control system 40, and further, the control system 40 can be prevented from executing an uncertain operation according to the too low voltage. If the voltage output by the switching power supply 10 is greater than or equal to the second preset voltage, the low-voltage protection circuit outputs the voltage output by the switching power supply 10 to the high-voltage protection circuit.
If the voltage output by the switching power supply 10 is greater than the first preset voltage, the high-voltage protection circuit does not output the voltage output by the switching power supply 10 to the control system 40, so that the control system 40 can be prevented from being damaged by the over-high voltage. If the voltage output by the switching power supply 10 is less than or equal to the first preset voltage, the high-voltage protection circuit outputs the voltage output by the switching power supply 10 to the control system 40, so that the voltage output to the control system 40 is between the second preset voltage and the first voltage, and the control system 40 can normally work. The reliability of the voltage output by the switching power supply 10 is improved.
The utility model provides a power output protection circuit includes switching power supply 10, first protection circuit 20, second protection circuit 30 and control system 40, and first protection circuit 20 is connected with switching power supply 10 and second protection circuit 30 respectively, and second protection circuit 30 still is connected with control system 40, and first protection circuit 20 is high-voltage protection circuit, and second protection circuit 30 is low-voltage protection circuit; alternatively, the first protection circuit 20 is a low voltage protection circuit, and the second protection circuit 30 is a high voltage protection circuit. The high-voltage protection circuit is used for controlling the voltage output to the control system 40 by the switching power supply 10 to be less than or equal to a first preset voltage, the low-voltage protection circuit is used for controlling the voltage output to the control system 40 by the switching power supply 10 to be greater than or equal to a second preset voltage, and the first preset voltage is greater than or equal to the second preset voltage. Because the power output protection circuit comprises the first protection circuit 20 and the second protection circuit 30, the first protection circuit 20 and the second protection circuit 30 can enable the voltage output to the control system 40 by the switching power supply 10 to be between the second preset voltage and the first preset voltage, thereby avoiding the phenomenon that the switching power supply 10 outputs too high or too low voltage to the control system 40, avoiding the damage of the too high voltage to the control system 40 and the problem that the control system 40 cannot work normally due to the too low voltage, and improving the reliability of the voltage output by the switching power supply 10.
based on any of the above embodiments, the structure of the power output protection circuit will be described in further detail below with reference to fig. 4 to 5.
For convenience of description, in the embodiment shown in fig. 4 and 5, the first protection circuit 20 is taken as a high-voltage protection circuit, and the second protection circuit 30 is taken as a low-voltage protection circuit.
Fig. 4 is a schematic structural diagram of the power output protection circuit according to the present invention. Referring to fig. 4, the high voltage protection circuit includes a voltage regulation component 201, wherein one end of the voltage regulation component 201 is connected to the switching power supply 10, the other end of the voltage regulation component 201 is grounded, and the voltage regulation component 201 is configured to be turned on when the voltage output by the switching power supply 10 is greater than or equal to a first preset voltage.
Optionally, the high-voltage protection circuit further includes a current limiting component 202, wherein one end of the current limiting component 202 is connected to the switching power supply 10; the other end of the current limiting part 202 is connected to the voltage stabilizing part 201.
referring to fig. 4, the low voltage protection circuit includes a transistor Q, wherein a gate of the transistor Q is connected to the switching power supply 10; the drain of the transistor Q is connected to the control system 40, and the source of the transistor Q is grounded.
optionally, the conduction voltage of the triode Q is a second preset voltage.
In practical application, when the voltage output by the high-voltage protection circuit is greater than or equal to the second preset voltage, the transistor Q is turned on, so that the voltage output by the high-voltage protection circuit can be output to the control system 40. When the voltage output by the high-voltage protection circuit is smaller than the second preset voltage, the triode Q is disconnected, so that the voltage output by the high-voltage protection circuit cannot be output to the control system 40, and further, the too low voltage can be prevented from being output to the control system 40.
Optionally, the low voltage protection circuit further includes a filter circuit 301, wherein one end of the filter circuit 301 is connected to the switching power supply 10, and the other end of the filter circuit 301 is connected to the control system 40.
Fig. 5 is a schematic structural diagram of the power output protection circuit provided by the present invention. Referring to fig. 5, the voltage regulation component 201 is a voltage regulation diode D, wherein the negative electrode of the voltage regulation diode D is connected to the switching power supply 10; the anode of the zener diode D is grounded.
Optionally, the conduction voltage of the zener diode D is a first preset voltage.
in practical application, when the voltage output by the switching power supply 10 is smaller than the first preset voltage, the zener diode D is in a cut-off state, so that the voltage output by the switching power supply 10 can be output to the low-voltage protection circuit. When the voltage output by the switching power supply 10 is greater than or equal to the first preset voltage, the zener diode D is in a conducting state, and the anode of the zener diode D is grounded, so that the zener diode D can short-circuit the low-voltage protection circuit, and the switching power supply 10 is prevented from outputting the voltage to the low-voltage protection circuit.
optionally, the voltage stabilizing component 201 is a voltage dependent resistor, wherein one end of the voltage dependent resistor is connected to the switching power supply 10; the other end of the piezoresistor is grounded.
in an actual application process, when the voltage output by the switching power supply 10 is less than the first preset voltage, the resistance of the voltage dependent resistor is infinite, and the voltage dependent resistor is equivalent to an open circuit, so that the voltage output by the switching power supply 10 can be output to the low-voltage protection circuit. When the voltage output by the switching power supply 10 is greater than or equal to the first preset voltage, the resistance of the voltage dependent resistor tends to 0, and the positive electrode of the voltage dependent resistor is grounded, so that the voltage dependent resistor can short-circuit the low-voltage protection circuit, and further the switching power supply 10 is prevented from outputting the voltage to the low-voltage protection circuit.
Optionally, the current limiting component 202 is a first resistor R1. The first resistor R1 may divide the voltage to limit the voltage output to the voltage stabilizing part 201, and thus may protect the voltage stabilizing part 201.
Referring to fig. 5, the filter circuit 301 includes a second resistor R2 and a capacitor C, wherein one end of the second resistor R2 is connected to the switching power supply 10; the other end of the second resistor R2 is respectively connected with one end of the capacitor C and the source level of the triode Q; the other end of the capacitor C is grounded.
In practical application, the filter circuit 301 can filter noise interference information of the gate of the transistor Q, so that the voltage output to the control system 40 is more stable.
The embodiment of the utility model provides an electromagnetism stove is still provided, include as above power output protection circuit.
The utility model provides an electromagnetic oven includes switching power supply 10, first protection circuit 20, second protection circuit 30 and control system 40, and first protection circuit 20 is connected with switching power supply 10 and second protection circuit 30 respectively, and second protection circuit 30 still is connected with control system 40, and first protection circuit 20 is high-voltage protection circuit, and second protection circuit 30 is low-voltage protection circuit; alternatively, the first protection circuit 20 is a low voltage protection circuit, and the second protection circuit 30 is a high voltage protection circuit. The high-voltage protection circuit is used for controlling the voltage output to the control system 40 by the switching power supply 10 to be less than or equal to a first preset voltage, the low-voltage protection circuit is used for controlling the voltage output to the control system 40 by the switching power supply 10 to be greater than or equal to a second preset voltage, and the first preset voltage is greater than or equal to the second preset voltage. Because the power output protection circuit comprises the first protection circuit 20 and the second protection circuit 30, the first protection circuit 20 and the second protection circuit 30 can enable the voltage output to the control system 40 by the switching power supply 10 to be between the second preset voltage and the first preset voltage, thereby avoiding the phenomenon that the switching power supply 10 outputs too high or too low voltage to the control system 40, avoiding the damage of the too high voltage to the control system 40 and the problem that the control system 40 cannot work normally due to the too low voltage, and improving the reliability of the voltage output by the switching power supply 10.
in the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
In addition, in the present application, unless otherwise expressly specified or limited, the terms "connected," "secured," "mounted," and the like are to be construed broadly, such as to encompass both mechanical and electrical connections; the terms may be directly connected or indirectly connected through an intermediate medium, and may be used for communicating between two elements or for interacting between two elements, unless otherwise specifically defined, and the specific meaning of the terms in the present application may be understood by those skilled in the art according to specific situations.
the terms "include" and "comprise," as well as derivatives thereof, mean inclusion without limitation. The term "or" is inclusive, meaning and/or.
The term "circuitry" refers to (a) hardware-only circuit implementations (e.g., implementations in analog circuitry and/or digital circuitry); (b) a combination of circuitry and a computer program product comprising software and/or firmware instructions stored on one or more computer-readable memories that work together to cause an apparatus to perform one or more functions described herein; and (c) circuitry that requires software or firmware, even if the software or firmware is not physically present, for operation, such as a microprocessor or a portion of a microprocessor. This definition of "circuitry" also applies to all uses of the term herein, including in any claims. As other examples, herein, the term "circuitry" also includes one or more processors and/or portions thereof and accompanying software and/or firmware implementations.
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 (10)
1. A power output protection circuit, comprising: a switching power supply (10), a first protection circuit (20), a second protection circuit (30) and a control system (40), wherein,
the first protection circuit (20) is respectively connected with the switching power supply (10) and the second protection circuit (30), the second protection circuit (30) is also connected with the control system (40), the first protection circuit (20) is a high-voltage protection circuit, and the second protection circuit (30) is a low-voltage protection circuit; or the first protection circuit (20) is the low-voltage protection circuit, and the second protection circuit (30) is the high-voltage protection circuit;
the high-voltage protection circuit is used for controlling the voltage output by the switching power supply (10) to the control system (40) to be less than or equal to a first preset voltage, the low-voltage protection circuit is used for controlling the voltage output by the switching power supply (10) to the control system (40) to be greater than or equal to a second preset voltage, and the first preset voltage is greater than the second preset voltage.
2. the power supply output protection circuit according to claim 1, wherein the high voltage protection circuit includes a voltage stabilization part (201), wherein,
one end of the voltage stabilizing component (201) is connected with the switching power supply (10), the other end of the voltage stabilizing component (201) is grounded, and the voltage stabilizing component (201) is used for conducting when the voltage output by the switching power supply (10) is greater than or equal to the first preset voltage.
3. the power supply output protection circuit according to claim 2, wherein the voltage regulation part (201) is a zener diode D, wherein,
the negative electrode of the voltage stabilizing diode D is connected with the switching power supply (10);
the anode of the voltage stabilizing diode D is grounded.
4. the power output protection circuit according to claim 2, wherein the voltage stabilization part (201) is a varistor, wherein,
One end of the piezoresistor is connected with the switching power supply (10);
the other end of the piezoresistor is grounded.
5. The power supply output protection circuit according to any one of claims 2 to 4, wherein the high voltage protection circuit further comprises a current limiting component (202), wherein,
One end of the current limiting component (202) is connected with the switching power supply (10);
The other end of the current limiting component (202) is connected with the voltage stabilizing component (201).
6. The power output protection circuit of claim 5, wherein the current limiting component (202) is a first resistor R1.
7. the power supply output protection circuit according to claim 1, wherein the low voltage protection circuit comprises a transistor Q, wherein,
the grid electrode of the triode Q is connected with the switching power supply (10);
the drain electrode of the triode Q is connected with the control system (40), and the source electrode of the triode Q is grounded.
8. the power supply output protection circuit according to claim 7, wherein the low voltage protection circuit further comprises a filter circuit (301), wherein one end of the filter circuit (301) is connected to the switching power supply (10), and the other end of the filter circuit (301) is connected to the control system (40).
9. The power supply output protection circuit according to claim 8, wherein the filter circuit (301) comprises a second resistor R2 and a capacitor C, wherein,
One end of the second resistor R2 is connected with the switching power supply (10);
The other end of the second resistor R2 is respectively connected with one end of the capacitor C and the source of the triode Q;
the other end of the capacitor C is grounded.
10. An induction cooker comprising the power output protection circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822134210.6U CN209805400U (en) | 2018-12-19 | 2018-12-19 | Power output protection circuit and electromagnetism stove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822134210.6U CN209805400U (en) | 2018-12-19 | 2018-12-19 | Power output protection circuit and electromagnetism stove |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209805400U true CN209805400U (en) | 2019-12-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822134210.6U Active CN209805400U (en) | 2018-12-19 | 2018-12-19 | Power output protection circuit and electromagnetism stove |
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| Country | Link |
|---|---|
| CN (1) | CN209805400U (en) |
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2018
- 2018-12-19 CN CN201822134210.6U patent/CN209805400U/en active Active
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