CN208623325U - overvoltage protection circuit and electric kettle - Google Patents
overvoltage protection circuit and electric kettle Download PDFInfo
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- CN208623325U CN208623325U CN201820994551.8U CN201820994551U CN208623325U CN 208623325 U CN208623325 U CN 208623325U CN 201820994551 U CN201820994551 U CN 201820994551U CN 208623325 U CN208623325 U CN 208623325U
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- 230000004224 protection Effects 0.000 title claims abstract description 64
- 238000001514 detection method Methods 0.000 claims description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 230000005611 electricity Effects 0.000 claims description 21
- 238000001914 filtration Methods 0.000 claims description 14
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- 230000015556 catabolic process Effects 0.000 description 6
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- 241001122767 Theaceae Species 0.000 description 2
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- 239000000203 mixture Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
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Abstract
The utility model provides an overvoltage protection circuit and insulating pot. The overvoltage protection circuit includes: the method comprises the following steps: the protection circuit comprises a first voltage division element, a second voltage division element, a triode and a circuit to be protected; the first end of the first voltage division element is respectively connected with a first direct-current power supply and a collector electrode of the triode, the second end of the first voltage division element is respectively connected with the first end of the second voltage division element, an emitter electrode of the triode and a power input pin of the circuit to be protected, the second end of the second voltage division element is grounded, and a power output pin of the circuit to be protected is connected with a base electrode of the triode; the circuit to be protected is used for setting the level of the output pin high when detecting that the voltage input by the power input pin is not higher than the preset voltage; and when the voltage input by the power supply input pin is detected to be higher than the preset voltage, the level of the output pin is set to be low. The utility model provides an overvoltage protection circuit and insulating pot have higher stability.
Description
Technical field
The utility model relates to circuit structure technical field more particularly to a kind of excess voltage protections and insulating pot.
Background technique
Insulating pot because have many advantages, such as heating speed it is fast, without oil smoke, filtering function is strong, heat insulation effect is good, be increasingly becoming
Indispensable a kind of electrical equipment in people's daily life.The main composition part of insulating pot have controller, heater circuit and
Switch etc..Controller control switch closure, so that switch connection power supply of the heater circuit by closure, to generate heat insulating pot
In water heating.Existing insulating pot has had been developed that more and more functions, such as keep the temperature, boil tea, warm milk etc..
Controller is the core devices that insulating pot realizes multiple functions.The circuit structure of controller is usually chip.But
Chip usually has a specific operating voltage range, and mains supply and unstable, when the supply voltage of chip is beyond chip
When operating voltage range, it is understood that there may be burn out the risk of chip.In the prior art, in order to avoid chip is burned, usually in core
Increase voltage regulator circuit in the current supply circuit of piece, more effectively to protect and improve chip operation stability, reliability, reduce chip
Spoilage prevents from causing insulating pot power supply to rise when mains supply powers bad or maintenance insulating pot power supply accidentally
Caused chip damage.
But there is fixed operating voltage range in voltage-stabilizing device, it is understood that there may be the breakdown situation of voltage regulator circuit.When steady
Volt circuit is breakdown, may cause chip and is damaged, the main circuit board that the insulating pot where chip is even resulted in when serious is scrapped, and is given
User brings unnecessary economic loss.
Utility model content
In order to solve the problems, such as at least one mentioned in background technique, the utility model provides a kind of excess voltage protection
And insulating pot, it avoids voltage regulator circuit and there is fixed operating voltage range, it is understood that there may be voltage regulator circuit is breakdown, leads to chip
Impaired problem.
The utility model first aspect provides a kind of excess voltage protection, comprising: the first sectional pressure element, the second partial pressure member
Part, triode and circuit to be protected；Wherein,
The first end of first sectional pressure element is connect with the collector of the first DC power supply and the triode respectively, institute
State the second end of the first sectional pressure element respectively with the first end of second sectional pressure element, the emitter of the triode and described
The power input pin of circuit to be protected connects, the second end ground connection of second sectional pressure element, the electricity of the circuit to be protected
Source output pin is connect with the base stage of the triode；
The circuit to be protected is used for, and is detecting the voltage of the power input pin input not higher than predeterminated voltage
When, the level of the output pin is set into height；When detecting that the voltage of the power input pin input is higher than predeterminated voltage,
The level of the output pin is set low.
Excess voltage protection as described above, further includes: current-limiting circuit；
The output pin of the circuit to be protected is connect by the current-limiting circuit with the base stage of the triode.
Excess voltage protection as described above, the current-limiting circuit include resistance；The efferent duct of the circuit to be protected
Foot is connect by the resistance with the base stage of the triode.
Excess voltage protection as described above, the circuit to be protected includes: voltage detection unit and control unit；
The input terminal of the voltage detection unit is connect with the second end of first sectional pressure element；The voltage detecting list
The input terminal of member is connect with described control unit；
It is described pre- whether the voltage for the second end that the voltage detection unit is used to detect first sectional pressure element is higher than
If voltage；
Described control unit is used for, and detects the electricity of the second end of first sectional pressure element in the voltage detection unit
When pressure is not higher than the predeterminated voltage, the level of the output pin of the circuit to be protected is set into height；In the voltage detecting list
When member detects that the voltage of the second end of first sectional pressure element is higher than the predeterminated voltage, by the defeated of the circuit to be protected
The level of pin is set low out.
Excess voltage protection as described above, further includes: voltage comparator circuit；
The first input end of the voltage comparator circuit is connect with the second end of first sectional pressure element；The voltage ratio
The second input terminal compared with circuit is connect with reference voltage；The electricity of the output end of the voltage comparator circuit and the circuit to be protected
The connection of source input pin；
The voltage comparator circuit is used for the voltage of the first input end and second input terminal, and will compare
As a result it is sent to the circuit to be protected；
The circuit to be protected is specifically used for, and controls the output pin of the circuit to be protected according to the comparison result
Level.
Excess voltage protection as described above, further includes: reference voltage provides circuit；The reference voltage provides circuit
Including third sectional pressure element and the 4th sectional pressure element；
The first end of the third sectional pressure element is connect with the second DC power supply, the second end point of the third sectional pressure element
It is not connect with the first end of the second input terminal of the voltage comparator circuit and the 4th sectional pressure element；The 4th partial pressure member
The second end of part is grounded.
Excess voltage protection as described above, first sectional pressure element, second sectional pressure element, the third point
It presses element and the 4th sectional pressure element is resistance.
The utility model second aspect provides a kind of insulating pot, comprising: switching circuit, heater circuit and such as above-mentioned first
Excess voltage protection in aspect in any possibility implementation；The circuit to be protected includes control unit；
First feeder ear of the first end of the switching circuit and power supply connects, the second end of the switching circuit with
The first end of the heater circuit connects, and the second end of the heater circuit is connect with the second feeder ear of the power supply；
Described control unit is connect with the control terminal of the switching circuit, for controlling the conducting of the switching circuit
And shutdown.
Insulating pot as described above, further includes: current rectifying and wave filtering circuit；
The first end of the switching circuit is connected by the first feeder ear of the current rectifying and wave filtering circuit and mains supply；
The second end of the heater circuit is connected by the second feeder ear of the current rectifying and wave filtering circuit and the mains supply
It connects.
Insulating pot as described above, further includes: temperature sensing circuit；The temperature sensing circuit and described control unit connect
It connects；
Described control unit is used to receive the temperature of water in the insulating pot that the temperature sensing circuit detects, according to institute
State the working condition that temperature controls the insulating pot.
Insulating pot as described above, further includes: water level detection circuit；The water level detection circuit and described control unit connect
It connects；
Described control unit is used to receive the water level in the insulating pot that the water level detection circuit detects, according to
The working condition of insulating pot described in the water level control.
Excess voltage protection provided by the embodiment of the utility model includes the first sectional pressure element, the second sectional pressure element, three
Pole pipe and circuit to be protected；Wherein, the first end of the first sectional pressure element collector with the first DC power supply and triode respectively
Connection, the second end of the first sectional pressure element emitter and electricity to be protected with the first end of the second sectional pressure element, triode respectively
The power input pin on road connects, the second end ground connection of the second sectional pressure element, the power supply output foot of circuit to be protected and three poles
The base stage of pipe connects；Circuit to be protected is used for, will when detecting the voltage of power input pin input not higher than predeterminated voltage
The level of output pin sets height；When detecting that the voltage of power input pin input is higher than predeterminated voltage, by output pin
Level is set low.The circuit to be protected of the utility model embodiment is in the voltage generation overvoltage for detecting that the first DC power supply provides
When, control triode shutdown, so that the partial pressure electricity that the first DC power supply is made up of the first bleeder circuit and the second bleeder circuit
Road direction circuit power supply to be protected, protects circuit to be protected, stability with higher.
The construction of the utility model and its other purpose of utility model and beneficial effect will be in conjunction with the accompanying drawings
Description of preferred embodiments and it is more obvious and easy to understand.
Detailed description of the invention
Fig. 1 is the structural schematic diagram one of excess voltage protection provided by the utility model；
Fig. 2 is the structural schematic diagram two of excess voltage protection provided by the utility model；
Fig. 3 is the structural schematic diagram three of excess voltage protection provided by the utility model；
Fig. 4 is the structural schematic diagram four of excess voltage protection provided by the utility model；
Fig. 5 is the structural schematic diagram five of excess voltage protection provided by the utility model；
Fig. 6 is the structural schematic diagram six of excess voltage protection provided by the utility model；
Fig. 7 is the structural schematic diagram one of insulating pot provided by the utility model；
Fig. 8 is the structural schematic diagram two of insulating pot provided by the utility model；
Fig. 9 is the structural schematic diagram three of insulating pot provided by the utility model.
Appended drawing reference:
11-the first sectional pressure element；
12-the second sectional pressure element；
13-triodes；
14-circuits to be protected；
141-voltage detection units；
142-control units；
15-current-limiting circuits；
151-resistance；
16-voltage comparator circuits；
17-reference voltages provide circuit；
171-third sectional pressure elements；
172-the four sectional pressure element；
18-switching circuits；
19-heater circuits；
20-excess voltage protections；
21-current rectifying and wave filtering circuits；
22-temperature sensing circuits；
23-water level detection circuits.
Specific embodiment
Fig. 1 is the structural schematic diagram one of excess voltage protection provided by the utility model.As shown in Figure 1, this is practical new
The excess voltage protection that type provides includes: the first sectional pressure element 11, the second sectional pressure element 12, triode 13 and circuit to be protected
14；Wherein,
The first end of first sectional pressure element 11 connects with the collector of the first DC power supply and the triode 13 respectively
Connect, the second end of first sectional pressure element 11 respectively with the first end of second sectional pressure element 12, the triode 13
Emitter is connected with the power input pin of the circuit 14 to be protected, the second end ground connection of second sectional pressure element 12, institute
The power supply output foot for stating circuit 14 to be protected is connect with the base stage of the triode 13；
The circuit to be protected 14 is used for, and is detecting the voltage of the power input pin input not higher than predeterminated voltage
When, the level of the output pin is set into height；When detecting that the voltage of the power input pin input is higher than predeterminated voltage,
The level of the output pin is set low.
Illustratively, as shown in Figure 1, circuit to be protected 14 can be insulating pot, electric kettle, electric cooker, electromagnetic oven, more
Controller in the electrical equipments such as scholar's furnace, excess voltage protection provided by the utility model can be widely applied to all with control
In the electronic device of circuit processed.
Illustratively, circuit 14 to be protected, such as the controller of insulating pot, are usually operated at 12V or so, work as voltage wave
When moving beyond 12V, it may cause circuit 14 to be protected and be burned.Existing insulating pot is usually in the current supply circuit of circuit 14 to be protected
Middle increase voltage regulator circuit, more effectively to protect and improve 14 job stability of circuit to be protected, reliability, reduce electricity to be protected
14 spoilage of road.But voltage regulator circuit stability is poor, there is also fixed operating voltage ranges, it is understood that there may be voltage regulator circuit quilt
The case where breakdown.When voltage regulator circuit is breakdown, it may cause protection circuit 14 and damage.
May be breakdown for voltage regulator circuit stability difference the problems such as, the utility model provide a kind of overvoltage protection electricity
Road.
Excess voltage protection provided in this embodiment is as shown in Figure 1, specifically include 11, second points of the first sectional pressure element
Press element 12, triode 13 and circuit to be protected 14.
First sectional pressure element 11 and the second sectional pressure element 12 are connected in series, composition series circuit, one end of series circuit, i.e.,
The first end of first sectional pressure element 11 is connect with the first DC power supply, the other end of series circuit, i.e. the second sectional pressure element 12
Second end ground connection.When the first DC power supply changes, the electricity of the junction of the first sectional pressure element 11 and the second sectional pressure element 12
Variation in proportion can occur according to voltage divider principle at all.Therefore the junction of the first sectional pressure element 11 and the second sectional pressure element 12 can be used
Voltage indicate the first DC power supply provide voltage swing.
Specifically, the resistance value of the first sectional pressure element 11 is denoted as R1, the resistance value of the second sectional pressure element 12 is denoted as R2, first
The voltage that DC power supply provides is denoted as U1, and the first sectional pressure element 11 and the voltage U2 of the junction of the second sectional pressure element 12 are then equal to
U1*R2/(R1+R2)。
Power input pin of the junction of first sectional pressure element 11 and the second sectional pressure element 12 also with circuit 14 to be protected
Connection, the voltage of the power input pin of circuit 14 to be protected are U1*R2/ (R1+R2).Therefore, when the first DC power supply provides
Voltage U1 be more than circuit 14 to be protected operating voltage range when, the voltage of the power input pin of circuit 14 to be protected is same
It is promoted, circuit 14 to be protected can determine whether the first DC power supply occurred electricity by detecting the voltage of power input pin
Pressure.When the first DC power supply generation overvoltage, then the first DC power supply should be avoided and power to circuit 14 to be protected, when the first direct current
Overvoltage does not occur for power supply, then the first DC power supply can be used and directly power to circuit 14 to be protected.
To realize the function, the collector of triode 13 is connect with the first end of the first sectional pressure element 11, triode 13
Emitter is connect with the second end of the first sectional pressure element 11, the power supply output foot of the base stage of triode 13 and circuit 14 to be protected
Connection.The level of the power supply output foot of circuit 14 to be protected can be high level or low level.
Triode 13 illustratively can be NPN type triode.According to the working principle of triode 13 it is found that working as triode
When 13 base stage and emitting stage voltage difference are greater than the conducting voltage of triode 13, triode 13 is connected, it is believed that triode 13 will
First sectional pressure element, 11 short circuit.The voltage of the first end of second sectional pressure element 12 is the voltage that the first DC power supply provides.When
When the base stage and emitting stage voltage difference of triode 13 are not more than the conducting voltage of triode 13, triode 13 is turned off, the first partial pressure
The voltage of the junction of element 11 and the second sectional pressure element 12 depends on the electricity of the first sectional pressure element 11 and the second sectional pressure element 12
Resistance value ratio.
When the level of the power supply output foot of circuit 14 to be protected is low, the base voltage of triode 13 is lower than triode
13 transmitting step voltage, therefore, the base stage and emitting stage voltage difference of triode 13 are not more than the conducting voltage of triode 13, this
When, the voltage of the power input pin of circuit 14 to be protected is U1*R2/ (R1+R2), the electricity provided less than the first DC power supply
Press U1.At this point, the power supply of circuit 14 to be protected will not be caused defeated overvoltage occurs for the voltage that the first DC power supply provides
The overtension for entering pin avoids circuit 14 to be protected and damages.
When the level of the power supply output foot of circuit 14 to be protected is high, the base voltage of triode 13 is greater than triode
13 transmitting step voltage, therefore, the base stage and emitting stage voltage difference of triode 13 are greater than the conducting voltage of triode 13, at this point,
First DC power supply is directly powered to the power input pin of circuit 14 to be protected.At this point, the first DC power supply should not occur
Overvoltage.
Therefore, when the first DC power supply starts power supply, circuit 14 to be protected controls the power supply output of circuit 14 to be protected
The level of pin be it is low, avoid triode 13 from being connected, to have the function that protection circuit 14 to be protected.14, circuit to be protected
Whether the voltage detected according to power input pin is greater than predeterminated voltage, and whether the voltage for determining that the first DC power supply provides is greater than
The operating voltage of circuit 14 to be protected.When circuit 14 to be protected detects that the voltage that the first DC power supply provides is greater than electricity to be protected
The operating voltage on road 14, then it is still low for controlling the level of the power supply output foot of circuit 14 to be protected.When circuit 14 to be protected is examined
The voltage for measuring the offer of the first DC power supply is not more than the operating voltage of circuit 14 to be protected, then controls the electricity of circuit 14 to be protected
The level of source output pin is height, at this point, triode 13 is connected, the first DC power supply is directly powered to circuit 14 to be protected.It protects
When having demonstrate,proved the first DC power supply overvoltage, the first DC power supply is powered without normal direction circuit 14 to be protected, and it is to be protected to play protection
The effect of circuit 14.
Excess voltage protection provided by the embodiment of the utility model includes the first sectional pressure element, the second sectional pressure element, three
Pole pipe and circuit to be protected；Wherein, the first end of the first sectional pressure element collector with the first DC power supply and triode respectively
Connection, the second end of the first sectional pressure element emitter and electricity to be protected with the first end of the second sectional pressure element, triode respectively
The power input pin on road connects, the second end ground connection of the second sectional pressure element, the power supply output foot of circuit to be protected and three poles
The base stage of pipe connects；Circuit to be protected is used for, will when detecting the voltage of power input pin input not higher than predeterminated voltage
The level of output pin sets height；When detecting that the voltage of power input pin input is higher than predeterminated voltage, by output pin
Level is set low.The circuit to be protected of the utility model embodiment is in the voltage generation overvoltage for detecting that the first DC power supply provides
When, control triode shutdown, so that the partial pressure electricity that the first DC power supply is made up of the first bleeder circuit and the second bleeder circuit
Road direction circuit power supply to be protected, protects circuit to be protected, stability with higher.
Illustratively, on the basis of embodiment shown in Fig. 1, circuit 14 to be protected is also used to the electricity in power supply output foot
It puts down when being high, whether the input voltage for detecting the power input pin of circuit 14 to be protected is greater than the most senior engineer of circuit 14 to be protected
Make voltage.If more than then the level of the control of circuit 14 power supply output foot to be protected is low, and triode 13 is turned off；If less
In then circuit 14 to be protected still controls the level of power supply output foot for height, so that the first DC power supply is continuously electricity to be protected
Road 14 powers.When further avoiding the first DC power supply generation overvoltage, the circuit to be protected 14 that may cause is damaged.
Further, embodiment, the utility model embodiment also provide a kind of excess voltage protection as shown in connection with fig. 1.
Fig. 2 is the structural schematic diagram two of excess voltage protection provided by the utility model.As shown in Fig. 2, in the present embodiment, it is excessively electric
Voltage protection circuit 14 further include: current-limiting circuit 15；
The output pin of circuit 14 to be protected is connect by current-limiting circuit 15 with the base stage of triode 13.
It illustratively, can be between the base stage of triode 13 and the output pin of circuit to be protected 14 for protection triode 13
Current-limiting circuit 15 is set.Current-limiting circuit 15 is used to limit the size of the electric current for the base stage for flowing into triode 13, plays three poles of protection
The effect of pipe 13.
Further, embodiment, the utility model embodiment also provide a kind of excess voltage protection as shown in connection with fig. 2.
Fig. 3 is the structural schematic diagram three of excess voltage protection provided by the utility model.Current-limiting circuit 15 is carried out in the present embodiment
It is described in detail.As shown in figure 3, current-limiting circuit 15 includes resistance 151；
The output pin of circuit 14 to be protected is connect by resistance 151 with the base stage of triode 13.
Illustratively, as shown in figure 3, current-limiting circuit 15 includes resistance 151, the first end of resistance 151 and circuit to be protected
14 output pin connection, the second end of resistance 151 are connect with the base stage of triode 13.Current-limiting circuit knot provided in this embodiment
Structure is simple, and cost is relatively low.
Illustratively, resistance 151 can be a resistance, or what the series connection and/or parallel connection of multiple resistance were constituted
Resistance circuit.
Further, in conjunction with any of the above-described embodiment, the utility model embodiment also provides a kind of excess voltage protection.
Fig. 4 is the structural schematic diagram four of excess voltage protection provided by the utility model.Circuit to be protected is specifically protected in the present embodiment
Protect voltage detection unit and control unit.Specifically as shown in figure 4, circuit 14 to be protected includes: voltage detection unit 141 and control
Unit 142；
The input terminal of voltage detection unit 141 is connect with the second end of the first sectional pressure element 11；Voltage detection unit 141
Input terminal is connect with control unit 142；
Whether the voltage for the second end that voltage detection unit 141 is used to detect the first sectional pressure element 11 is higher than predeterminated voltage；
Control unit 142 is used for, and detects the voltage of the second end of the first sectional pressure element 11 not in voltage detection unit 141
When higher than predeterminated voltage, the level of the output pin of circuit 14 to be protected is set into height；First is detected in voltage detection unit 141
When the voltage of the second end of sectional pressure element 11 is higher than predeterminated voltage, the level of the output pin of circuit 14 to be protected is set low.
Illustratively, as shown in figure 4, circuit to be protected 14 includes voltage detection unit 141, voltage detection unit 141 can
Think low-voltage detection circuit, the voltage of the junction for detecting the first sectional pressure element 11 and the second sectional pressure element 12, and compare
The size of the voltage and predeterminated voltage that relatively detect is controlled when the voltage detected is not higher than predeterminated voltage by control unit 142
The level for making the output pin of circuit 14 to be protected sets height, so that the first DC power supply is directly powered to circuit 14 to be protected；When
When the voltage that voltage detection unit 141 detects is higher than predeterminated voltage, then control unit 142 controls the defeated of circuit 14 to be protected
The level of pin is set low out, so that the first DC power supply can not directly power to circuit 14 to be protected, it is to be protected to play protection
The effect of circuit 14.
Further, in conjunction with any of the above-described embodiment, the utility model embodiment also provides a kind of excess voltage protection.
Fig. 5 is the structural schematic diagram five of excess voltage protection provided by the utility model.Excess voltage protection is also in the present embodiment
Including voltage comparator circuit.As shown in figure 5, excess voltage protection, further includes: voltage comparator circuit 16；
The first input end of voltage comparator circuit 16 is connect with the second end of the first sectional pressure element 11；Voltage comparator circuit 16
The second input terminal connect with reference voltage；The power input pin of the output end of voltage comparator circuit 16 and circuit 14 to be protected
Connection；
Voltage comparator circuit 16 is used to compare the voltage of first input end and the second input terminal, and comparison result is sent to
Circuit 14 to be protected；
Circuit 14 to be protected is specifically used for, and the level of the output pin of circuit 14 to be protected is controlled according to comparison result.
Illustratively, as shown in figure 5, circuit to be protected 14 further includes voltage comparator circuit 16.Voltage comparator circuit 16
Two input terminals are connect with the second end of the first sectional pressure element 11 and reference voltage respectively.The output end of voltage comparator circuit 16
It is connect with the power input pin of circuit 14 to be protected.The output end of voltage comparator circuit 16 can export high level or low electricity
It is flat, indicate respectively that the voltage of the second end of the first sectional pressure element 11 is greater than the second end of reference voltage or the first sectional pressure element 11
Voltage be not more than reference voltage.
Circuit 14 to be protected directly can control circuit to be protected according to the output result of the output end of voltage comparator circuit 16
The level of 14 output pin.Whether the voltage for judging that the first DC power supply is provided by using voltage comparator circuit 16 exceeds
The operating voltage range of circuit 14 to be protected can simplify the structure of circuit 14 to be protected.
Illustratively, the out-phase input terminal of voltage comparator circuit 16 is connect with the second end of the first sectional pressure element 11, voltage
The non-inverting input terminal of comparison circuit 16 receives reference voltage.Circuit 14 to be protected receives the output end of voltage comparator circuit 16
When voltage is low, it may be determined that overvoltage occurs for the voltage that the first DC power supply provides.When circuit 14 to be protected receives voltage ratio
Compared with the voltage of the output end of circuit 16 be it is high when, it may be determined that the first DC power supply provide voltage overvoltage does not occur.
Further, embodiment, the utility model embodiment also provide a kind of excess voltage protection as shown in connection with fig. 5.
Fig. 6 is the structural schematic diagram six of excess voltage protection provided by the utility model.Excess voltage protection is also in the present embodiment
Circuit is provided including reference voltage.As shown in fig. 6, excess voltage protection further includes that reference voltage provides circuit 17；With reference to electricity
It includes third sectional pressure element 171 and the 4th sectional pressure element 172 that pressure, which provides circuit 17,；
The first end of third sectional pressure element 171 is connect with the second DC power supply, the second end difference of third sectional pressure element 171
It is connect with the first end of the second input terminal of voltage comparator circuit 16 and the 4th sectional pressure element 172；The of 4th sectional pressure element 172
Two ends ground connection.
Illustratively, as shown in fig. 6, it includes third sectional pressure element 171 and the 4th partial pressure member that reference voltage, which provides circuit 17,
Part 172.Third sectional pressure element 171 and the series connection of the 4th sectional pressure element 172, the first end of third sectional pressure element 171 and the second direct current
Power supply connection, the second end ground connection of the 4th sectional pressure element 172.Second DC power supply is different from the first DC power supply.
Illustratively, in above-mentioned any embodiment, the first sectional pressure element 11, the second sectional pressure element 12, third partial pressure member
Part 171 and the 4th sectional pressure element 172 all can be resistance.The resistance can be a resistance, or the string of multiple resistance
Connection and/or the resistance circuit in parallel constituted.
On the other hand the utility model embodiment also provides a kind of insulating pot, Fig. 7 is insulating pot provided by the utility model
Structural schematic diagram one.As shown in fig. 7, insulating pot provided in this embodiment includes: switching circuit 18, heater circuit 19 and such as
In Fig. 1 to 6 it is any shown in excess voltage protection 20；Circuit 14 to be protected includes control unit 142；
The first end of switching circuit 18 and the first feeder ear of power supply connect, the second end and heating of switching circuit 18
The first end of circuit 19 connects, and the second end of heater circuit 19 and the second feeder ear of power supply connect；
Control unit 142 is connect with the control terminal of switching circuit 18, the turn-on and turn-off for control switch circuit 18.
Illustratively, as shown in fig. 7, insulating pot includes switching circuit 18, heater circuit 19 and excess voltage protection 20.
Excess voltage protection 20 can be the excess voltage protection as shown in any embodiment in Fig. 1 to 6.Switching circuit 18 adds
Heater circuit 19 and power supply connection, constitute the heating circuit of insulating pot.
Circuit to be protected 14 in excess voltage protection 20 is the control unit 142 of insulating pot.Control unit 142 with open
The control terminal on powered-down road 18 connects, the turn-on and turn-off for control switch circuit 18.
Illustratively, on the basis of the embodiment shown in fig. 7, Fig. 8 is that the structure of insulating pot provided by the utility model is shown
It is intended to two.As shown in figure 8, insulating pot further include: current rectifying and wave filtering circuit 21；
The first end of switching circuit 18 is connect by current rectifying and wave filtering circuit 21 with the first feeder ear of mains supply；
The second end of heater circuit 19 is connect by current rectifying and wave filtering circuit 21 with the second feeder ear of mains supply.
Illustratively, insulating pot further includes current rectifying and wave filtering circuit 21, and current rectifying and wave filtering circuit can be low-pass filter circuit.It is whole
Stream filter circuit 21 can use that resistance, inductively or capacitively etc. electronic components series and parallel is formed to realize filter function, than
Such as, high pass filter unit is composed in parallel using resistance and capacitor, is connected using resistance with capacitor T-type, form low-pass filter unit
Deng.Current rectifying and wave filtering circuit 21 is for being rectified and being filtered to mains supply.
Illustratively, on the basis of Fig. 7 or embodiment illustrated in fig. 8, Fig. 9 is the knot of insulating pot provided by the utility model
Structure schematic diagram three.As shown in figure 9, insulating pot further include: temperature sensing circuit 22；Temperature sensing circuit 22 and control unit 142
Connection；
Control unit 142 is used to receive the temperature that temperature sensing circuit 22 detects water in obtained insulating pot, according to temperature
Control the working condition of insulating pot.
It illustratively, further include temperature sensing circuit 22 in insulating pot, temperature sensing circuit 22 may include temperature sensing
Device or thermistor etc..The temperature that temperature sensing circuit 22 is used to detect the temperature of the water in insulating pot, and will test is sent
To control unit 142.The work shape for the water temperature adjustment insulating pot that control unit 142 is used to be detected according to temperature sensing circuit 22
State.The working condition of insulating pot is specifically as follows the operating mode of heater circuit 19.Operating mode is specifically as follows holding mode,
Boil tea mode etc..
Illustratively, as shown in figure 9, insulating pot further include: water level detection circuit 23；Water level detection circuit 23 and control are single
Member 142 connects；
Control unit 142 is used to receive the water level in the insulating pot that the detection of water level detection circuit 23 obtains, according to water level control
The working condition of insulating pot processed.
Illustratively, as shown in figure 9, insulating pot further includes water level detection circuit 23, water level detection circuit 23 is for detecting
Water in insulating pot, and water is sent to control unit 142.Control unit 142 is used for according to the water tune in insulating pot
The working condition of whole insulating pot.Illustratively, control unit 142 can determine the difference of insulating pot according to the water in insulating pot
Heat duration.
Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should
Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of
Technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new
The range of each embodiment technical solution of type.
Claims (10)
1. a kind of excess voltage protection characterized by comprising the first sectional pressure element (11), the second sectional pressure element (12), three
Pole pipe (13) and circuit to be protected (14)；Wherein,
The first end of first sectional pressure element (11) connects with the collector of the first DC power supply and the triode (13) respectively
Connect, the second end of first sectional pressure element (11) respectively with the first end of second sectional pressure element (12), the triode
(13) emitter is connected with the power input pin of the circuit (14) to be protected, and the second of second sectional pressure element (12)
End ground connection, the power supply output foot of the circuit (14) to be protected are connect with the base stage of the triode (13)；
The circuit to be protected (14) is used for, and is detecting the voltage of the power input pin input not higher than predeterminated voltage
When, the level of the output pin is set into height；When detecting that the voltage of the power input pin input is higher than predeterminated voltage,
The level of the output pin is set low.
2. excess voltage protection according to claim 1, which is characterized in that further include: current-limiting circuit (15)；
The output pin of the circuit to be protected (14) is connected by the base stage of the current-limiting circuit (15) and the triode (13)
It connects.
3. excess voltage protection according to claim 2, which is characterized in that the current-limiting circuit (15) includes resistance
(151)；
The output pin of the circuit to be protected (14) is connect by the resistance (151) with the base stage of the triode (13).
4. excess voltage protection according to claim 1, which is characterized in that the circuit (14) to be protected includes: electricity
Press detection unit (141) and control unit (142)；
The input terminal of the voltage detection unit (141) is connect with the second end of first sectional pressure element (11)；The voltage
The input terminal of detection unit (141) is connect with described control unit (142)；
Whether the voltage for the second end that the voltage detection unit (141) is used to detect first sectional pressure element (11) is higher than institute
State predeterminated voltage；
Described control unit (142) is used for, and detects first sectional pressure element (11) in the voltage detection unit (141)
When the voltage of second end is not higher than the predeterminated voltage, the level of the output pin of the circuit (14) to be protected is set into height；?
The voltage detection unit (141) detects that the voltage of the second end of first sectional pressure element (11) is higher than the predeterminated voltage
When, the level of the output pin of the circuit (14) to be protected is set low.
5. excess voltage protection according to claim 1, which is characterized in that further include: voltage comparator circuit (16)；
The first input end of the voltage comparator circuit (16) is connect with the second end of first sectional pressure element (11)；The electricity
Second input terminal of pressure comparison circuit (16) is connect with reference voltage；The output end of the voltage comparator circuit (16) and it is described to
Protect the power input pin connection of circuit (14)；
The voltage comparator circuit (16) is used for the voltage of the first input end and second input terminal, and will compare
As a result it is sent to the circuit to be protected (14)；
The circuit to be protected (14) is specifically used for, and the efferent duct of the circuit (14) to be protected is controlled according to the comparison result
The level of foot.
6. excess voltage protection according to claim 5, which is characterized in that further include: reference voltage provides circuit
(17)；It includes third sectional pressure element (171) and the 4th sectional pressure element (172) that the reference voltage, which provides circuit (17),；
The first end of the third sectional pressure element (171) is connect with the second DC power supply, and the of the third sectional pressure element (171)
Two ends connect with the first end of the second input terminal of the voltage comparator circuit (16) and the 4th sectional pressure element (172) respectively
It connects；The second end of 4th sectional pressure element (172) is grounded.
7. excess voltage protection according to claim 6, which is characterized in that first sectional pressure element (11), described
Second sectional pressure element (12), the third sectional pressure element (171) and the 4th sectional pressure element (172) are resistance.
8. a kind of insulating pot characterized by comprising switching circuit (18), heater circuit (19) and such as claim 1 to 7
Any one of described in excess voltage protection (20)；The circuit to be protected (14) includes control unit (142)；
The first end of the switching circuit (18) and the first feeder ear of power supply connect, and the second of the switching circuit (18)
End is connect with the first end of the heater circuit (19), the second end of the heater circuit (19) and the second of the power supply
Feeder ear connection；
Described control unit (142) is connect with the control terminal of the switching circuit (18), for controlling the switching circuit (18)
Turn-on and turn-off.
9. insulating pot according to claim 8, which is characterized in that further include: current rectifying and wave filtering circuit (21)；
The first end of the switching circuit (18) is connected by the first feeder ear of the current rectifying and wave filtering circuit (21) and mains supply
It connects；
The second power supply that the second end of the heater circuit (19) passes through the current rectifying and wave filtering circuit (21) and the mains supply
End connection.
10. insulating pot according to claim 9, which is characterized in that further include: temperature sensing circuit (22)；The temperature
Detection circuit (22) is connect with described control unit (142)；
Described control unit (142) is used to receive the temperature of water in the insulating pot that the temperature sensing circuit (22) detection obtains,
The working condition of the insulating pot is controlled according to the temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820994551.8U CN208623325U (en) | 2018-06-26 | 2018-06-26 | overvoltage protection circuit and electric kettle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820994551.8U CN208623325U (en) | 2018-06-26 | 2018-06-26 | overvoltage protection circuit and electric kettle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208623325U true CN208623325U (en) | 2019-03-19 |
Family
ID=65702330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820994551.8U Active CN208623325U (en) | 2018-06-26 | 2018-06-26 | overvoltage protection circuit and electric kettle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208623325U (en) |
-
2018
- 2018-06-26 CN CN201820994551.8U patent/CN208623325U/en active Active
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