CN201045732Y - Switch having current-limiting function - Google Patents
Switch having current-limiting function Download PDFInfo
- Publication number
- CN201045732Y CN201045732Y CNU2007201477371U CN200720147737U CN201045732Y CN 201045732 Y CN201045732 Y CN 201045732Y CN U2007201477371 U CNU2007201477371 U CN U2007201477371U CN 200720147737 U CN200720147737 U CN 200720147737U CN 201045732 Y CN201045732 Y CN 201045732Y
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Abstract
A switch with current limiting function comprises a casing whose inner portion is provided with a containing space, a through-hole which is arranged at the surrounding face of the casing and is communicated with the containing space, a circuit board whose circuit structure comprises a rectification voltage regulation unit, a load voltage sampling unit, an operating unit, and a rely component and an impedance regulation unit. The circuit board is arranged in the containing space of the casing, the impedance regulation unit has a regulating component which can regulate impedance and/or cut off the power supply of the circuit, the regulating component projects out of the casing form the through-hole for operating. The circuit of the switch is connected with electrical loading, the load voltage sampling unit can sample load voltage, when the sampled voltage is beyond the rated scope, the circuit of the switch works normally, and when the sampled loading voltage is overloaded, the operating unit forces the relay component cut off the load circuit, and the circuit works normally after the power of the electrical loading is reduced.
Description
Technical field
The utility model is known clearly it about a kind of circuit overloads protective device, refers to a kind of switch of tool metering function.
Background technology
Use many electrical appliances in the daily life.Because employed alternating current is the voltage of quota in the family,, promptly can consume more electric current and more power consumption when the power of employed electrical appliance is bigger.
Because natural resources is limited,, will cause the acceleration consume of the energy if the electrical appliance that uses is high-power person.Safeguard that earth resource has become widespread consensus, majority are ready to use the electrical appliance of smaller power, simultaneously, some countries are also arranged in the regulation of formulating or encourage to use small-power electrical equipment articles for use.Yet, though many people have the inclination energy savings, do not notice that the power of electrical appliance indicates, the phenomenon of misuse high-power electric appliance articles for use is still often arranged.This kind human negligence promptly causes the consumption of the energy.For solving this disappearance, be necessary to come interpretation, to avoid human error with the equipment of a simple operations.
Summary of the invention
Main purpose of the present utility model is to provide a kind of switch of tool metering function, can whether surpass rated power for the load of simply distinguishing employed electrical appliance.Technical solutions of the utility model:
A kind of switch of tool metering function is characterized in that, includes:
One housing is a longitudinal bodies, and its inside has an accommodation space; One through hole is located at this housing side face, is connected with this accommodation space;
One circuit board has printed circuit and is connected in electronic component on the circuit; One controlling element is located on this circuit board; This circuit structure comprises:
One in order to the rectification stable pressuring unit of direct voltage to be provided, and is connected in AC power;
One load voltage sampling unit, it has one in order to obtain the dividing potential drop sampling point of a load sampling voltage;
One is used for the relatively running unit of this load sampling voltage and this benchmark comparative voltage size, has at least one operational amplifier and at least one benchmark comparative voltage; This running unit and this load voltage sampling unit be connected; This operates the unit;
One normality keeps connecting the relay element of load circuit, is connected with the output of this running unit;
One is used to adjust impedance to adjust the impedance adjustment unit of load circuit power, is connected with this relay element;
This circuit board is installed in the accommodation space of this housing; This impedance adjustment unit has controlling element, and this controlling element protrudes out this housing from this through hole.
Wherein, this impedance adjustment unit has the variable resistor of regulation and control.
Wherein, this circuit is also installed the ON-OFF switch that can control by controlling element.
Wherein, this variable resistor and this switch are incorporated on this controlling element.
Wherein, the ON-OFF switch that can control by controlling element of this circuit installing one.
Wherein, this dividing potential drop sampling point of this load voltage sampling unit has one in order to adjust the variable resistor of this load sampling voltage magnitude of voltage.
Wherein, the VCC voltage of this benchmark comparative voltage for providing through the resistance step-down.
Wherein, this running unit comprises: an overload comparing unit, an overload are from a lock unit and a driver element; This overload comparing unit has one first benchmark comparative voltage, is connected in an input of this overload comparing unit; Another input of this overload comparing unit is connected with this load voltage sampling unit; This overload is connected with the output of this overload comparing unit from the input of lock unit, and the output from lock unit of transshipping is divided into two the tunnel, the one road and constitutes a feedback loop, and another road is connected in the input of this driver element; The output of this driver element is connected in this relay element.
Wherein, this running unit has in addition: one second benchmark comparative voltage is parallel to this overload from an input of lock unit and an input of this driver element; This overload is connected with the output of this overload comparing unit from another input of lock unit; Another input of this driver element is connected with the output of this overload from lock unit.
Wherein, the side face of this housing is provided with some open-works; And also include: a sleeve pipe is sheathed on this housing periphery.
The utility model beneficial effect: by said structure, the circuit of the utility model switch is connected in electrical property load, this load voltage sampling unit load voltage of can taking a sample, and when sampling voltage is in rated range, the circuit operate as normal of this switch; When the load voltage of sampling transshipped, this running unit made this relay element cut off load circuit.Behind the power that reduces electrical property load, can make circuit reply operate as normal.Can reach the practical function that energy savings consumes.
Be the effect that can further understand the purpose of this utility model, feature and be reached, below lift the utility model one preferred embodiment now, and after cooperating graphic being described in more detail in.
Description of drawings
Fig. 1 is the stereogram of the utility model one preferred embodiment.
Fig. 2 is the exploded perspective view of Fig. 1.
Fig. 3 is the longitudinal sectional drawing of Fig. 1.
Fig. 4 is the circuit diagram of the utility model one preferred embodiment.
Fig. 5 is the structure of the comparing unit of Fig. 4.
Embodiment
See also Fig. 1 to Fig. 3, switch 10 provided by the utility model includes: a housing 20 and is installed in the circuit board 30 in this housing.
This housing 20 is a longitudinal bodies, and its inner hollow and have an accommodation space 22 is as Fig. 3.One through hole 24 is located at the side face of this housing one end, is good with the end face of housing, and is communicated with this accommodation space 22.Some open-works 26 are located at the side face of housing 20 other ends.
One sleeve pipe 28 is sheathed on this housing 20 peripheries.
This circuit board 30 is microscler, is printed with circuit and installs some electronic components, and its circuit 40 structures as shown in Figure 4 will be in description.This electronic component comprises a controlling element 32, and this circuit board 30 is installed in the accommodation space 22 of this housing 20, and this controlling element 32 is installed in this through hole 24, and its knob 33 also protrudes out this housing 20, for controlling.
See also Fig. 4, this circuit 40 comprises: a rectification stable pressuring unit 50, a load voltage sampling unit 60, an impedance adjustment unit 70, a running unit 80 and a relay element 90.
This rectification stable pressuring unit 50 is connected in the input of alternating current, and the AC rectification voltage stabilizing is become direct voltage, as the required operating voltage of circuit.Alternating current is a direct current through diode C2, C3, C4, C5 and ZD (Zener (Zener) diode) filtering voltage regulation after capacitor C 1 and resistance R 2 step-downs, diode D1, D2 halfwave rectifier again.Present embodiment is more established a three terminal regulator U1 to provide more accurate, stable operating voltage to the VCC circuit in rectification unit.
This load voltage sampling unit 60 is connected in the input of AC power, has resistance R 4, resistance R 5 and a variable resistor VR1.R4 produces pressure drop when load condition; Diode D3 and D4 provide big electric current or high voltage protective effect, and measure against electrical leakage flows through greatly.This resistance R 5 and variable resistor VR1 form a dividing potential drop sampling point 62, to obtain a load sampling voltage.The magnitude of voltage of this load sampling voltage can be adjusted by this variable resistor VR1, to adapt to the electrical appliance of all kinds of different capacities.For example, for bulb or the less electrical equipment of electric fan constant power, the dividing potential drop of sampling can be adjusted into lower numerical value; For electric heater, electrical equipment that the grill pan constant power is bigger, then the dividing potential drop of sampling can be adjusted into higher numerical value.The dividing potential drop sampling point 62 of this sampling unit 60 is connected in the pin 3 of the comparator 82 of this running unit 80, for the electrode input end of first group of operational amplifier IC1 of this comparator, as Fig. 5.
One capacitor C 6 and a resistance R 6 are connected in 80 of dividing potential drop sampling point 62 and this running unit, to provide filter action to sampling unit 60, prevent that bad signal from producing misoperation.
These impedance adjustment unit 70 1 ends are connected in this load voltage sampling unit 60, and the other end then is connected with electrical property load.This impedance adjustment unit 70 comprises: one exchanges thyratron (exchanging silicon control thyratron) (TRIAC) Q1, a variable resistor 72, one two-way diac DB1 etc.When adjusting this variable resistor 72, can adjust the power of load circuit.
This running unit 80 has an IC comparator 82, and present embodiment system uses model to be: the integrated circuit of LM324 not as limit, can be the integrated circuit that other have identical function.Please cooperate and consult Fig. 5, this comparator has 4 operational amplifier: IC1 to IC4, and 14 pins.
This running unit 80 comprises the plurality of sub unit, is respectively: overload comparing unit 82, overload are from lock unit 84 and driver element 86.This overload comparing unit 82 comprises: first group of operational amplifier IC1 and resistance R 9 and R10.The pin 3 (electrode input end) of IC1 is connected in this sampling unit 40.This two resistance R 9, R10 form one first benchmark comparative voltage 83, and the contact between this two resistance is connected in the pin 2 (negative input) of IC1 certainly.VCC voltage is through R9 step-down, R10 dividing potential drop, for the pin 2 of IC1 provides a benchmark comparative voltage.This overload is connected in this overload comparing unit 82 from lock unit 84, it comprises: second group of operational amplifier IC2, the 3rd group of operational amplifier IC3, the pin 5 (electrode input end) of this IC2 is connected with the output (pin 1) of the IC1 of overload comparing unit 52, and IC2 pin 7 (output) is connected in the pin 10 (electrode input end) of IC3.One resistance R 15 and a resistance R 16 form one second benchmark comparative voltage 85, and this two contact is parallel to the pin 12 (electrode input end) of the IC4 of the pin 9 (negative input) of pin 6 (negative input), IC3 of IC2 and driver element 86 certainly.The output of this IC3 (pin 8) forms two along separate routes, and one connects diode D6 and resistance R 14 along separate routes, and the multiply-connected pin 5 that is connected to IC2 forms a feedback loop feedback effect is provided; Another then is coupled directly to next stage operational amplifier, i.e. IC4 along separate routes.The pin 13 (negative input) of the IC4 of this driver element 86 is connected with upper level fortune amplifier; Its pin 14 (output) is connected in aforesaid relay element 90.
In addition, the running unit 80 of present embodiment more includes: a filter unit 88 is connected between IC1 and the IC2, and filter action is provided.
This relay element 90 can be the relay of mechanical type or electronic type.Relay element 90 shown in the present embodiment is an optical coupler (Phototriac, or title OPTOCPUPLER TRIAC), and the one end is connected with the output of running unit 80, and the other end then is connected in this impedance adjustment unit 70.Relay element 90 makes 80 control actions that can play ON-OFF of impedance adjustment unit 70 and running unit.
This circuit more can be installed an ON-OFF switch 95, to cut off circuit power.In present embodiment, this switch 95 on the circuit is integrated into this controlling element 32 with aforesaid variable resistor 72, by this, and this controlling element may command ON-OFF and impedance.
The flowing mode of doing of the present utility model below is described.Switch 10 of the present utility model so that a rated power to be provided, at different electrical appliances, can be set different power-handling capabilities as the metering function of various electrical appliance 100.When bearing power during less than rated value, the circuit operate as normal of switch; If during the bearing power overrate of electrical appliance, the utility model will cut off load circuit, at this moment, must change lower powered electrical appliance or downgrade its power.
At first make this ON-OFF switch 95 be ON.In the time of in the load of employed electrical equipment is in the rated power scope that circuit 40 sets, circuit 40 is an operate as normal.During load, load current produces pressure drop in R4 two ends, and this dividing potential drop sampling point 62 produces dividing potential drop sampling actions, with the voltage input running unit 80 of sampling, via the pin 3 of the IC1 of overload comparing unit 82 and pin 2 relatively.In loading on the rated power scope, the voltage of the pin 3 of IC1 is lower than first reference voltage 83 that pin 2 is connected, and circuit 40 is in normal operating conditions, the pin 14 output high potentials of this comparator 82, make relay element 90 conductings, make load circuit be on-state.
When normal operating conditions, adjust the impedance of variable resistor 72, adjustable power.
In impedance adjustment unit 70 parts, power supply charges to capacitor C 7 via resistance R 7 and variable resistor 72.When the charging voltage of this electric capacity R7 during greater than 30 to 39 volts, bidirectional trigger diode DB1 is switched on, and makes through resistance R 8 to exchange thyristor Q1 conducting.
When if the load of electrical appliance surpasses the nominal working range of circuit, the pressure drop that resistance R 4 two ends produce is promptly corresponding to strengthen, make the voltage of IC1 pin 3 of overload comparing unit 82 be higher than the reference voltage 83 of IC1 pin 2, the pin 1 output high level of IC1, circuit enters overload.
From IC1 pin 1 output high level, make the D5 conducting, enter the pin 5 of overload from second group of operational amplifier IC2 of lock unit 84, pin 5 voltages of IC2 are higher than second reference voltage 85 that pin 6 is connected, the pin 7 of IC2 is exported high level, directly enters the pin 10 of the 3rd group of operational amplifier IC3.Simultaneously, IC3 the voltage of pin 10 be higher than the voltage of pin 9, make pin 8 output HIGH voltages and be divided into two the tunnel, one the road feeds back to the pin 5 of IC2 from D6 and R14, advance to make the pin 7 and 8 of IC2 and IC3 to export the high pressure position all the time, form self-locking work until circuit breaker, must could remove self-locking state by VCC voltage discharge off.
Another road of pin 8 directly enters the pin 13 of IC4, in relatively descending of IC4, the voltage of pin 13 is higher than the voltage of pin 12, pin 14 no-output voltages (or low level), relay element 90 is ended, interchange thyristor Q1 also loses trigger voltage and ends, and reaches the purpose of disconnecting consumers circuit, and electrical appliance decommissions.
Load circuit under the state of overload by automatic disconnection after, overload keeps self-locking states from lock unit 84, makes the contact 14 of IC4 keep no level or output low levels, relay element 90 keeps the cut-out load circuits.The present invention utilizes simple feedback system to form self-locking work, makes electrical equipment surpassing under the state of load and can't using, and guarantees the purpose of working load under rated power, with energy savings.
When desiring to make circuit 40 resumption of service of this switch, the user must stop the supply of alternating current, switch 95 is switched to OFF, to cut off whole power supply, and the bearing power of reduction electrical equipment is to the rated power scope, for example change the electrical equipment of lower-wattage or heighten the impedance of variable resistor 72, the energized beginning can be replied normal condition once more.
The capacitor C 6 and the R6 that are located at 80 of load voltage sampling unit 60 and running unit disturb in order to ripple in the elimination sampling unit 60, in case noise signal produces misoperation; And prevent that the instantaneous voltage electric current from producing the interference to circuit.In addition, when overload,, eliminate the misoperation that ripple disturbs and the load surge current is produced through filter unit 88 shaping filters from the high level that IC1 pin 1 is exported.Acting as of this filter unit 88: when C6 and R6 can't eliminate interference to special circumstances, the temporary impact that produces of capacitive load, inductive load, comprehensive working load for example, when causing IC1 to produce misoperation, discharge and recharge under the effect at C8, C9 and R11, can't make the D5 conducting, can not enter next stage comparison amplifier IC2, to improve whole antijamming capability of circuit and stability.
Switch provided by the utility model, the use power that is available for users to simply to differentiate electrical appliance whether overrate, whether under the high capacity power rating, use, use and reduce artificial carelessness.When the bearing power overrate of electrical appliance, before the user does not downgrade bearing power, the circuit structure of this switch will cut off load circuit, remind the user to change low-power electrical equipment or downgrade use power.In case when bearing power was cut to rated range, switch was promptly replied normal operating condition.
The utility model is for the load of resistance-type detecting and the reference voltage of resistance-type is provided, and can obtain more stable detecting result and start result.
The above person only is a concrete enforcement structure of the present utility model, when not limiting scope of the present utility model with this.Any simple modification or equivalence of doing according to technology contents of the present utility model changes, and all still belongs to the scope that the utility model is contained.For example, change the relay element of present embodiment the relay of electromagnetic type into, and can adapt to the pattern of relay element, connect relay element when making comparator with the output high level; Or do not connect relay element etc. during output voltage.
Claims (10)
1. the switch of a tool metering function is characterized in that, includes:
One housing is a longitudinal bodies, and its inside has an accommodation space; One through hole is located at this housing side face, is connected with this accommodation space;
One circuit board has printed circuit and is connected in electronic component on the circuit; One controlling element is located on this circuit board; This circuit structure comprises:
One in order to the rectification stable pressuring unit of direct voltage to be provided, and is connected in AC power;
One load voltage sampling unit, it has one in order to obtain the dividing potential drop sampling point of a load sampling voltage;
One is used for the relatively running unit of this load sampling voltage and this benchmark comparative voltage size, has at least one operational amplifier and at least one benchmark comparative voltage; This running unit and this load voltage sampling unit be connected; This operates the unit;
One normality keeps connecting the relay element of load circuit, is connected with the output of this running unit;
One is used to adjust impedance to adjust the impedance adjustment unit of load circuit power, is connected with this relay element;
This circuit board is installed in the accommodation space of this housing; This impedance adjustment unit has controlling element, and this controlling element protrudes out this housing from this through hole.
2. the switch of tool metering function as claimed in claim 1 is characterized in that: this impedance adjustment unit has the variable resistor of regulation and control.
3. the switch of tool metering function as claimed in claim 2 is characterized in that: this circuit is also installed the ON-OFF switch that can control by controlling element.
4. the switch of tool metering function as claimed in claim 3 is characterized in that: this variable resistor and this switch are incorporated on this controlling element.
5. the switch of tool metering function as claimed in claim 1 is characterized in that: the ON-OFF switch that this circuit installing one can be controlled by controlling element.
6. the switch of tool metering function as claimed in claim 1 is characterized in that: this dividing potential drop sampling point of this load voltage sampling unit has one in order to adjust the variable resistor of this load sampling voltage magnitude of voltage.
7. the switch of tool metering function as claimed in claim 1 is characterized in that: the VCC voltage of this benchmark comparative voltage for providing through the resistance step-down.
8. the switch of tool metering function as claimed in claim 1 is characterized in that: this running unit comprises: an overload comparing unit, an overload are from a lock unit and a driver element; This overload comparing unit has one first benchmark comparative voltage, is connected in an input of this overload comparing unit; Another input of this overload comparing unit is connected with this load voltage sampling unit; This overload is connected with the output of this overload comparing unit from the input of lock unit, and the output from lock unit of transshipping is divided into two the tunnel, the one road and constitutes a feedback loop, and another road is connected in the input of this driver element; The output of this driver element is connected in this relay element.
9. the switch of tool metering function as claimed in claim 8 is characterized in that: this running unit has in addition: one second benchmark comparative voltage is parallel to this overload from an input of lock unit and an input of this driver element; This overload is connected with the output of this overload comparing unit from another input of lock unit; Another input of this driver element is connected with the output of this overload from lock unit.
10. the switch of tool metering function as claimed in claim 1 is characterized in that: the side face of this housing is provided with some open-works; And also include: a sleeve pipe is sheathed on this housing periphery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201477371U CN201045732Y (en) | 2007-04-27 | 2007-04-27 | Switch having current-limiting function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201477371U CN201045732Y (en) | 2007-04-27 | 2007-04-27 | Switch having current-limiting function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201045732Y true CN201045732Y (en) | 2008-04-09 |
Family
ID=39309201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201477371U Expired - Fee Related CN201045732Y (en) | 2007-04-27 | 2007-04-27 | Switch having current-limiting function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201045732Y (en) |
-
2007
- 2007-04-27 CN CNU2007201477371U patent/CN201045732Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080409 |