CN204517685U - Direct voltage limiting circuit, atmosphere control system controller and thermostat - Google Patents
Direct voltage limiting circuit, atmosphere control system controller and thermostat Download PDFInfo
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- CN204517685U CN204517685U CN201520126797.XU CN201520126797U CN204517685U CN 204517685 U CN204517685 U CN 204517685U CN 201520126797 U CN201520126797 U CN 201520126797U CN 204517685 U CN204517685 U CN 204517685U
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Abstract
The utility model discloses the illustrative embodiments of the system for limiting DC voltage.In the exemplary embodiment, a kind of DC voltage limiting circuit generally includes electric current supply portion, and this electric current supply portion is configured to receiver voltage input signal and provides voltage to output signal.The protection portion of this circuit is configured at least temporarily limit based on the amplitude of voltage input signal or stop the operation in electric current supply portion.Voltage level control part is configured to voltage output signal to be restricted to predetermined voltage level.In some embodiments, this DC voltage limiting circuit is arranged in atmosphere control system controller.
Description
Technical field
The utility model relates in general to direct current (Direct Current, DC) voltage limiting circuit, atmosphere control system controller and thermostat.
Background technology
These chapters and sections provide the background information relevant with the utility model, and it differs and is decided to be prior art.
Digital thermostat and other atmosphere control system controller have the assembly of microcomputer and other lasting electricity consumption usually.Various thermostat can utilize stealing to obtain operating power.Therefore, such as, when the load (such as air compressor, fan or air valve) in atmosphere control system is disconnected, can from the operating power for stealing the circuit of this load for thermostat.
Utility model content
These chapters and sections provide general overview of the present utility model, are not that full breadth of the present utility model or the comprehensive of whole feature disclose.
According to various aspects, disclose the illustrative embodiments of the system for limiting DC voltage.In the exemplary embodiment, a kind of DC voltage limiting circuit generally includes electric current supply portion, and this electric current supply portion is configured to receiver voltage input signal and provides voltage to output signal.The protection portion of this circuit is configured at least temporarily limit based on the amplitude of voltage input signal or stop the operation in electric current supply portion.Voltage level control part is configured to voltage output signal to be restricted to predetermined voltage level.In some embodiments, this DC voltage limiting circuit is arranged in atmosphere control system controller.
In another illustrative embodiments, a kind of DC voltage limiting circuit comprises the first transistor and transistor seconds, this the first transistor and transistor seconds are configured to receiver voltage input signal, each transistor has emitter, and this emitter is configured to provide the electric current flowing through switch to output signal to provide voltage.Transistor seconds has the base stage with the first Zener (Zener) Diode series relative to voltage input signal reverse biased.Second Zener diode has the Zener voltage of the Zener voltage higher than the first Zener diode.Second Zener diode to be connected between the grid of switch and the source electrode of switch and relative to this grid reverse biased.Third transistor has by the 3rd Zener diode and exports with voltage the base stage be connected, and the 3rd Zener diode exports reverse biased and the Zener voltage had corresponding to predetermined voltage level relative to voltage.
From description provided herein, other suitable application area will become apparent.Description in the utility model content and particular example are only intended for illustrative object, are not intended to limit scope of the present utility model.
Accompanying drawing explanation
Accompanying drawing described herein only for selected execution mode being described but not the object of all possible implementation, is not intended to limit scope of the present utility model.
Fig. 1 is the schematic diagram comprising the thermostat of DC voltage limiting circuit according to an example embodiment of the present utility model;
Fig. 2 is the schematic diagram of the DC voltage limiting circuit according to an example embodiment of the present utility model; With
Fig. 3 is the schematic diagram of the DC voltage limiting circuit according to an example embodiment of the present utility model.
Run through these views of accompanying drawing, the parts that corresponding Reference numeral instruction is corresponding.
Embodiment
More fully example embodiment is described now with reference to accompanying drawing.
Inventor of the present utility model has realized that most atmosphere control system thermostat uses 24V to 30V to exchange (Alternating Current, AC) input voltage and inputs as power supply, usually uses AC/DC transducer to obtain DC voltage.Then linear circuit or reduction voltage circuit can be used to reduce the voltage for energy storage device and power for thermostat system.But the thermostat of incorrect link may be wired to 24V transformer by client.In this case, the AC input supplying thermostat can be such as 48V to 60V.If use thermostat after false wiring, then can there is problems of excessive heat and/or overvoltage problem.Therefore, inventor has developed and disclosed herein the example embodiment of DC voltage limiting circuit, and this DC voltage limiting circuit generally includes electric current supply portion, and this electric current supply portion is configured to receiver voltage input signal and provides voltage to output signal.The protection portion of this circuit is configured at least temporarily limit based on the amplitude of voltage input signal or stop the operation in electric current supply portion.Voltage level control part is configured to voltage output signal to be restricted to predetermined voltage level.
Referring now to accompanying drawing, Fig. 1 illustrates the illustrative embodiments of atmosphere control system controller (such as thermostat 10), and this thermostat 10 comprises the DC voltage limiting circuit 14 embodying one or more aspect of the present utility model.As shown in Figure 1, the stealing circuit 18 of thermostat 10 such as obtains electric energy by one or more loads 22 of atmosphere control system 26, and this atmosphere control system 26 comprises thermostat 10.Such as, as shown in Figure 1, the bridge rectifier 30 of stealing circuit 18 receives by unactivated heating or refrigeration load 22 electric energy be such as between 18VAC and 30VAC.Unactivated load 22 can be such as the air valve or air compressor that disconnect.Stealing circuit 18 obtains electric energy by load 22 from such as transformer (not shown), and when connecting load 22, this transformer is that load 22 is powered.
It should be noted that stealing circuit 18 is only exemplary.In each execution mode of the present utility model, for various energy value, can adopt and carry out stealing from various power supply in various manners.Shall also be noted that according to various aspects of the present utility model, the DC voltage limiting circuit about other except thermostat or additional electronic equipment and/or controller can be realized.Further, although provide various voltage and other value in various example embodiment described in this article, these values are only examples, and provide to help to understand various execution mode.
Referring again to Fig. 1, bridge rectifier 30 can provide the DC output voltage of wide region to DC voltage limiting circuit 14, such as, from about 25V to about 42V.DC voltage limiting circuit 14 makes power capacitor C1 charge to such as about 30VDC.Voltage drop transducer (such as reduction voltage circuit 34) is electrically connected with DC voltage limiting circuit 14 and is connected to capacitor C1 two ends.Reduction voltage circuit 34 provides the voltage of such as 3.3VDC to export 38 to various thermostat circuit 42, it is one or more that thermostat circuit 42 includes but not limited in following item: microprocessor 46, temperature sensor 50, humidity sensor 54, Wireless Fidelity (Wireless Fidelity, Wi-Fi) module 58, relay control module 62 and/or other thermostat functionality module 66.The voltage that capacitor C1 is connected to DC voltage limiting circuit 14 is held between 74 with exporting 70 and power supply.In this example embodiment, DC voltage limiting circuit 14 is for limiting the input voltage of supply capacitor C1.The voltage that another capacitor C2 is arranged on reduction voltage circuit is held between 74 with exporting 38 and power supply.
An example embodiment of DC voltage limiting circuit is indicated in fig. 2 generally with Reference numeral 100.DC voltage limiting circuit 100 inputs 104 place's receiver voltage input signals at voltage, and this voltage input signal is such as the rectified AC voltage from the rectification circuit be included in the stealing circuit of thermostat (not shown in Fig. 2).DC voltage limiting circuit 100 uses two capacitor C3 and C4 to provide output voltage Vcap1, such as, for powering for thermostat load 108.Capacitor C3 and capacitor C4 is connected to output voltage Vcap1 with parallel way and ground is held between GND.In this example embodiment, provide two capacitor C3 and C4 although it should be noted that, also can provide single capacitor in other embodiments or more than two capacitors.
Voltage Vcap1 changes with load 108 and the quantity of electric charge on capacitor C3 and capacitor C4.In the present embodiment, voltage Vcap1 is restricted to 30VDC by DC voltage limiting circuit 100, and load 108 is reduction voltage circuit (not shown in Fig. 2).But it should be noted that may be used for voltage being restricted to other magnitude of voltage and/or be used for being provided in the voltage used in the circuit of other or addition type exports according to the execution mode of the various DC voltage limiting circuits of many aspects of the present utility model.
In this example embodiment, during thermostat operation, voltage input 104 is usually between 24V and 30V.Such as, but when the wiring error on the 24V transformer of atmosphere control system is connected to the thermostat comprising DC voltage limiting circuit 100 by user, voltage input 104 can be high singularly, between 48VAC and 60VAC.In this example embodiment, DC voltage limiting circuit 100 is configured to, input voltage reach may cause the level of overheated and/or excessive voltage condition in other side time, protection stealing circuit and thermostat.
Referring again to Fig. 2, small resistor R1 is set between voltage input 104 and the remainder of DC voltage limiting circuit 100.The collector electrode 116 of resistor R1 and resistor R2, the first Zener diode CR1, resistor R3 and NPN transistor Q2 is connected to node 112 place.The emitter 120 of transistor Q2 is connected with the emitter 124 of NPN transistor Q3.Emitter 120 and emitter 124 all connect with the drain electrode 128 of Metal-Oxide Semiconductor field-effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET) M1.The electric current leaving the source electrode 132 of MOSFET M1 is in output voltage Vcap1.
The anode 136 of Zener diode CR1 is connected with the base stage 140 of transistor Q3 by resistor R5.The base stage 144 of transistor Q2 is connected to by resistor R4 between the collector electrode 148 of resistor R3 and transistor Q3.The grid 152 of MOSFET M1 is connected between resistor R2 and resistor R7.This grid 152 is also connected to node 154 place by the second Zener diode CR2 connected with diode D1 with the source electrode 132 of MOSFET M1.The negative electrode 156 of Zener diode CR2 is directed to node 154 with the anode 160 of diode D1.
The collector electrode 164 of NPN transistor Q1 inputs 104 with resistor R7 with voltage by resistor R1, resistor R2 and is connected.Hold GND with leaving the current direction of the emitter 168 of transistor Q1.3rd Zener diode CR3 and resistor R6 connects with the base stage 172 of transistor Q1, and the electric current being in output voltage Vcap1 received from MOSFET source 132 exports.The anode 176 of Zener diode CR3 and negative electrode 180 are directed to transistor Q1 and resistor R6 respectively.In this example embodiment, Zener diode CR1, Zener diode CR2 and Zener diode CR3 have different Zener voltages separately, and wherein, in three Zener voltages, the Zener voltage of CR1 is minimum, and the Zener voltage of CR3 is the highest.
In operation, transistor Q2 and transistor Q3 supplies electric current to DC voltage limiting circuit 100.MOSFET M1 as switch, in order to transmit and to cut off the electric current that receives from transistor Q2 and transistor Q3.Transistor Q1 and Zener diode CR3 serves as on-off controller, for the level of output voltage Vcap1 being restricted to the Zener voltage of Zener diode CR3.Zener diode CR2 and diode D1 exempts from by abnormal high input voltage for the protection of DC voltage limiting circuit 100.
Such as, when the signal that voltage inputs 104 places has the voltage lower than the Zener voltage of Zener diode CR1, the emitter 120 that electric current flows through transistor Q2 arrives MOSFET M1.Electric current also flows through the grid 152 of MOSFET M1, and positive grid-source voltage makes MOSFET M1 switch to conducting and keep conducting.Electric current flows through MOSFET M1 to charge to capacitor C3 and capacitor C4.When the Zener voltage of the voltage signal that voltage inputs 104 places more than CR1, electric current flows through transistor Q3 and MOSFET M1, makes output voltage Vcap1 can be used on load 108 and capacitor C3 and capacitor C4 place.
When Zener voltage more than CR2 of the voltage at Zener diode CR2 place, electric current flows through the source electrode 132 that Zener diode CR2 and diode D1 enters switch M1, and restriction grid voltage reduces to protect MOSFET M1.Electric current can flow through transistor Q2 and/or transistor Q3 subsequently to provide voltage Vcap, such as previously mentioned.Therefore, if such as input 104 places at the voltage of the thermostat of false wiring to receive abnormal high voltage signal, then DC voltage limiting circuit 100 can be protected.In an example embodiment, Zener diode CR1 has the Zener voltage of 8.2V, and Zener diode CR2 has the Zener voltage of 16V.
When voltage Vcap1 reached the Zener voltage according to Zener diode CR3 of DC voltage limiting circuit 100 and the upper limit (such as the 30V) that arrange time, electric current flows through the base stage 172 of Zener diode CR3 and transistor Q1.Then electric current flows through collector electrode 164 and the emitter 168 arrival point end GND of transistor Q1, until voltage Vcap1 gets back to the voltage level of the Zener voltage being less than Zener diode CR3.
The example components of DC voltage limiting circuit 100 is as follows:
R1：12Ω
R2：43KΩ
R3：0.96KΩ
R4：1KΩ
R5：3.9KΩ
R6：10KΩ
R7：20KΩ
Q1：NSS60201
Q2：FCX493
Q3：NSS60201
CR1：MMSZ4694，Vz＝8.2V
CR2：MMSZ4703，Vz＝16V
CR3：MMSZ4713，Vz＝30V
D1：MBR0540
M1：DMN10H220
C3：820uf
C4：820uf
Another example embodiment of DC voltage limiting circuit is indicated in figure 3 generally with Reference numeral 200.DC voltage limiting circuit 200 inputs 204 place's receiver voltage input signals at voltage, and this voltage input signal is such as the rectified AC voltage from the rectification circuit be included in the stealing circuit of thermostat (not shown in Fig. 3).DC voltage limiting circuit 200 uses two capacitor C5 and C6 to provide output voltage Vcap2, such as, for powering for thermostat load 208.Capacitor C5 and capacitor C6 is connected to output voltage Vcap2 with parallel way and ground is held between GND.In this example embodiment, provide two capacitor C5 and C6 although it should be noted that, also can provide single capacitor in other embodiments or more than two capacitors.
Voltage Vcap2 changes with load 208 and the quantity of electric charge on capacitor C5 and capacitor C6.In the present embodiment, voltage Vcap2 is restricted to 30VDC by DC voltage limiting circuit 200, and load 208 is reduction voltage circuit (not shown in Fig. 3).But it should be noted that may be used for voltage being restricted to other magnitude of voltage and/or be used for being provided in the voltage used in the circuit of other or addition type exports according to the execution mode of the various DC voltage limiting circuits of many aspects of the present utility model.
In this example embodiment, during thermostat operation, voltage input 204 is usually between 24V and 30V.Such as, but when the wiring error on the 24V transformer of atmosphere control system is connected to the thermostat comprising DC voltage limiting circuit 200 by user, voltage input 204 can be high singularly, between 48VAC and 60VAC.In this example embodiment, DC voltage limiting circuit 200 is configured to, input voltage reach may cause the level of overheated and/or excessive voltage condition in other side time, protection stealing circuit and thermostat.
Referring again to Fig. 3, small resistor R8 is set between voltage input 204 and the remainder of DC voltage limiting circuit 200.The collector electrode 216 of resistor R8 and resistor R9, NPN transistor Q4, the collector electrode 220 of NPN transistor Q5 and resistor R10 are connected to node 212 place, and this resistor R10 connects with Zener diode CR4.Several resistors of connecting can be provided to replace single resistor R9.In addition, usually it should be noted that being described as the various assemblies comprised in various embodiments herein can be replaced by the assembly of various functionally equivalence in some cases.
It is right that transistor Q4 and transistor Q5 is configured to Darlington (Darlington).That is, transistor Q4 is connected as follows with transistor Q5: the electric current that one of them transistor amplifies is amplified further by another transistor.In each execution mode, compared to each transistor adopted separately, Darlington configuration can provide higher public pole/emitter current gain.The emitter 224 of transistor Q4 is connected at node 228 place with the base stage 232 of transistor Q5.Resistor R11 is connected between the base stage 236 of transistor Q4 and node 228.Resistor R12 is connected between the emitter 240 of node 228 and transistor Q5.The electric current being in voltage Vcap2 leaving the emitter 240 of transistor Q5 is provided to capacitor C5, capacitor C6 and load 208.
The base stage 236 of transistor Q4 is connected between resistor R9 and resistor R13.Resistor R13 is connected between the collector electrode 244 of base stage 236 and NPN transistor Q7.The emitter 248 of transistor Q7 holds GND with being connected to.The anode 252 of Zener diode CR5 is connected with the base stage 256 of transistor Q7.Resistor R14 is connected between the negative electrode 260 of transistor Q7 and output voltage Vcap2.The anode 262 of Zener diode CR4 is connected with the base stage 264 of NPN transistor Q6.The collector electrode 268 of transistor Q6 is connected with node 228.The electric current leaving the emitter 272 of transistor Q6 is in output voltage Vcap2.
In operation, Darlington transistor Q4 and transistor Q5 supplies electric current to DC voltage limiting circuit 200.Transistor Q7 and Zener diode CR5 serves as on-off controller, and for the level of output voltage Vcap2 being restricted to the Zener voltage of Zener diode CR5, in this example embodiment, the Zener voltage of Zener diode CR5 is 30V.Zener diode CR4 and transistor Q6 exempts from by overheated for the protection of transistor Q5.When transistor Q5 stops supply electric current (as described below), transistor Q4 can continue to supply electric current to capacitor C5, capacitor C6 and load 208.
When the signal that voltage inputs 204 places has the voltage lower than the Zener voltage of Zener diode CR4, electric current flows through transistor Q4 and transistor Q5, to provide voltage Vcap2 at capacitor C5, capacitor C6 and load 208 place.When Zener voltage (in this example embodiment be 9.1V) of the signal voltage that voltage inputs 204 places more than CR4, electric current starts the emitter 224 from transistor Q4, through collector electrode 268 and the emitter 272 of transistor Q6, flow to the base stage 264 of transistor Q6.When substantially slowing down or stopping the current flowing through transistor Q5, transistor Q4 continues supply electric current.
When voltage Vcap2 reached the Zener voltage according to Zener diode CR5 of DC voltage limiting circuit 200 and the upper limit (such as the 30V) that arrange time, electric current flows through the base stage 256 of Zener diode CR5 and transistor Q7.Then electric current flows through the collector electrode 244 arrival point end GND of transistor Q7.
When voltage input 204 is extremely high, circuit 200 converts high voltage input to charge to capacitor C5 and capacitor C6 electric current, the output voltage of capacitor is restricted to desired value.In this manner, can prevent high voltage input from directly supplying subsequent conditioning circuit, such as, capacitor C1 in Fig. 1 and/or reduction voltage circuit 34, thus such as the installation scenarios of mistake provides protection.
The example components of DC voltage limiting circuit 200 is as follows:
R8：12Ω
R9：600KΩ
R10：4.7KΩ
R11：10KΩ
R12：10KΩ
R13：5.1KΩ
R14：10KΩ
Q4：NSS60201
Q5：FCX493
Q6：NSS60201
Q7：NSS60201
CR4：MMSZ4696，Vz＝9.1V
CR5：MMSZ4713，Vz＝30V
C5：820uf
C6：820uf
The execution mode of aforementioned circuit and method can provide the low cost of DC voltage to limit in various circuit, and various circuit is including but not limited to the stealing circuit for atmosphere control system thermostat.Various execution mode may be used for providing the considerable power supply with low-power consumption with low cost.Such as, if setter does not have exact connect ion 24V transformer and thermostat, then the execution mode of aforementioned circuit can by avoiding overheated and preventing excessive voltage condition from protecting thermostat.Various execution mode can make supply enough electric currents to power termination and output voltage control become possibility to desired value simultaneously.For manufacture lower wattage power supply and/or battery powered application product, all component is the execution mode of linear modules can be cheap, and this is particularly advantageous in thermostat.In various embodiments, the common DC/DC voltage limiting circuit with suitable current output capability can be provided.This circuit can provide wide AC input range with low cost, and its power consumption level is low.Such as compared to DC/DC reduction voltage circuit, use MOSFET can be configured with low cost easily as the execution mode of switch.
Therefore, in various execution mode of the present utility model, DC voltage limiting circuit comprises: electric current supply portion, and this electric current supply portion is configured to receiver voltage input signal and provides voltage to output signal; Protection portion, this protection portion is configured at least temporarily limit based on the amplitude of voltage input signal or stop the operation in electric current supply portion; And voltage level control part, this voltage level control part is configured to voltage output signal to be restricted to predetermined voltage level; This DC voltage limiting circuit is arranged in atmosphere control system controller.
In some embodiments, electric current supply portion comprises the first transistor and transistor seconds, each transistor has emitter, this emitter is configured to provide the electric current flowing through switch to output signal to provide voltage, transistor seconds has the base stage of connecting with the first Zener diode, and the first Zener diode has the negative electrode back to this base stage; The first transistor is configured to, and when voltage input signal has the voltage lower than the Zener voltage of the first Zener diode, supply flow is through the electric current of switch; And transistor seconds is configured to, when Zener voltage more than the first Zener diode of the voltage of voltage input signal, supply flow is through the electric current of switch.
In some execution modes of DC voltage limiting circuit, protection portion comprises the second Zener diode, and the Zener voltage of the second Zener diode is higher than the Zener voltage of the first Zener diode, and the second Zener diode is connected between the grid of switch and the source electrode of switch; And protection portion is configured to the operation of control switch.
In some execution modes of DC voltage limiting circuit, voltage level control part comprises third transistor, this third transistor has by the 3rd Zener diode and exports with voltage the base stage be connected, and the 3rd Zener diode has the Zener voltage corresponding to predetermined voltage level.
In some execution modes of DC voltage limiting circuit, the first Zener diode has the Zener voltage of 8.2 volts, and the second Zener diode has the Zener voltage of 16 volts, and the 3rd Zener diode has the Zener voltage of 30 volts.
In some embodiments, electric current supply portion comprises the first transistor and transistor seconds that are in Darlington configuration, and this first transistor and transistor seconds are configured to receiver voltage input signal and export with voltage be connected.
In some execution modes of DC voltage limiting circuit; protection portion comprises the first Zener diode be connected between voltage input and the base stage of third transistor, and protection portion is configured to limit the operation of a transistor in the transistor being in Darlington configuration.
In some execution modes of DC voltage limiting circuit, voltage level control part comprises the 4th transistor, 4th transistor has by the second Zener diode and exports with voltage the base stage be connected, and this second Zener diode has the Zener voltage corresponding to predetermined voltage level.
In some execution modes of DC voltage limiting circuit, voltage input signal is provided by stealing circuit, and voltage output signal is used for powering to controller.
In some execution modes of DC voltage limiting circuit, atmosphere control system controller comprises thermostat.
In various implementations, the method for restriction DC voltage comprises: output signal to provide voltage in response to voltage input signal supply electric current, this supply is performed by the electric current supply portion of the DC voltage limiting circuit of atmosphere control system controller; Based on the operation of the amplitude Limited Current supply unit of voltage input signal, this restriction is performed by the protection portion of DC voltage limiting circuit; And voltage output signal is restricted to predetermined voltage maximum level.
In some implementations, method comprise use voltage output signal power to controller.
In various embodiments, DC voltage limiting circuit comprises: the first transistor and transistor seconds, this the first transistor and transistor seconds are configured to receiver voltage input signal, each transistor has emitter, this emitter is configured to provide the electric current flowing through switch to output signal to provide voltage, and transistor seconds has the base stage of connecting with the first Zener diode relative to voltage input signal reverse biased; Second Zener diode, the Zener voltage of this second Zener diode is higher than the Zener voltage of the first Zener diode, and the second Zener diode to be connected between the grid of switch and the source electrode of switch and relative to this grid reverse biased; And third transistor, this third transistor has by the 3rd Zener diode and exports with voltage the base stage be connected, and the 3rd Zener diode exports reverse biased and the Zener voltage had corresponding to predetermined voltage level relative to voltage.
In some execution modes of DC voltage limiting circuit, the first transistor is configured to, and when Zener voltage lower than the first Zener diode of the voltage of voltage input signal, supply flow is through the electric current of switch; And transistor seconds is configured to, when Zener voltage more than the first Zener diode of the voltage of voltage input signal, provide the electric current flowing through switch.
In some embodiments, DC voltage limiting circuit comprises the diode of connecting with the 3rd Zener diode.
In some execution modes of DC voltage limiting circuit, predetermined voltage level is 30 volts.
In various embodiments, atmosphere control system controller comprises DC voltage limiting circuit.
In various embodiments, thermostat comprises DC voltage limiting circuit.
Example embodiment is provided, makes the utility model be detailed, and its scope will be given full expression to those skilled in the art.Many details are proposed, such as the example of concrete assembly, equipment and method, to provide the complete understanding to execution mode of the present utility model.It will be apparent to one skilled in the art that and not necessarily use detail, example embodiment can be embodied in many different forms, and detail and example embodiment should not be regarded as limiting scope of the present utility model.In some example embodiment, do not describe known flow process, known device structure and known technology in detail.In addition, utilize the accessible advantage of one or more illustrative embodiments of the present utility model and improve and be only provided for illustration purposes, do not limit scope of the present utility model, such as, illustrative embodiments disclosed herein can provide all above-mentioned advantages and improvement or not provide any above-mentioned advantage and improvement, but still within scope of the present utility model.
Concrete size disclosed herein, concrete material and/or concrete shape are examples in nature, do not limit scope of the present utility model.Particular value for given parameters disclosed herein and specific value scope do not get rid of other value in the one or more examples that can be used in example disclosed herein and value scope.In addition, can predict, any two particular values for design parameter stated herein can limit the end points (that is, also may be used for given parameters for the first value of given parameters and the arbitrary value disclosed between the first value and the second value that openly can be construed as of the second value) of the value scope being applicable to given parameters.Such as, if citing proves that parameter X has value A and also has value Z in this article, then can predict, parameter X can have the value scope from about A to about Z.Similarly; can predict; for two or more value scopes of parameter, (no matter whether these scopes are nested; overlapping or distinguishing) likely the combining of scope comprised for this value is disclosed, can use that the end points of disclosed scope is claimed above-mentionedly likely to be combined.Such as, if citing proves that parameter X has the value in scope 1-10 or 2-9 or 3-8 in this article, then also can predict, parameter X can have other value scope, comprises 1-9,1-8,1-3,1-2,2-10,2-8,2-3,3-10 and 3-9.
Term used herein only for the object describing specific example embodiment, and is not intended to be construed as limiting.As used herein, singulative " " and " being somebody's turn to do " can be intended to also comprise plural form, clearly indicate unless separately had in literary composition.Term " comprises ", " comprising " and " having ", all right and wrong were exclusive, therefore refer to the feature listed by existence, integer, step, operation, element and/or assembly, but do not get rid of existence or additional one or more further feature, integer, step, operation, element, assembly and/or its combination.Method step described herein, flow process and operation should not be interpreted as necessarily requiring it to realize according to certain order that is discussed or that illustrate, realize order unless specified.Also should be appreciated that can adopt additional or can the step of alternative.
When element or layer be called as on another element or layer, be incorporated to another element or layer, be connected to another element or layer or be coupled to another element or layer time, this element or layer can directly on another element or layer, be incorporated to another element or layer, be connected to another element or layer or be coupled to another element or layer, or the element that can exist between or layer.Otherwise, when element be called as directly on another element or layer, be directly incorporated into another element or layer, be directly connected to another element or layer or be directly coupled to another element or layer time, there is not element between or layer.Other saying (such as, " between " contrast " directly between ", " adjacent " contrast " direct neighbor " etc.) for describing the relation between element should be understood in a similar fashion.As used herein, term "and/or" comprise be associated list in one or more combination in any and all combinations.
Term " about ", when being applied to value, it refers to some slight inaccuracy (the closely exact values calculating or measure permissible value; Approximately or quite close on exact value; Be almost exact value).If for some reason, in the art, the inaccuracy that its ordinary meaning can not be utilized to understand " about " provide, then " about " used herein at least indicates the modification that can result from the conventional method measuring or use this kind of parameter.Such as, term " usually " can be used in this article, " about " and " substantially " mean within manufacturing tolerance.Or, such as, when revising the amount of part that is of the present utility model or that adopt or reactant, the change that term " about " used herein refers to can be passed through used general measure and processing procedure while carrying out concentrating or dissolving in real world (mistake such as, neglected in by these processes and), be caused the numerical quantities occurred by the difference of the purity for the manufacture of the manufacturing process of synthetic or manner of execution, raw material, part etc.Term " about " also comprises the different equilibrium condition of the synthetic that the specific original mixture of reason is formed and causes different amounts.Whether no matter modify by term " about ", claim comprises and equals this tittle.
Although term first, second, third, etc. can be used in this article to describe each element, assembly, region, layer and/or part, these elements, assembly, region, layer and/or part not should limit by these terms.These terms can only for distinguishing an element, assembly, region, layer or part and another element, assembly, region, layer or part.Order or order do not inferred in the term of such as " first " used herein, " second " and other numerical value term, clearly indicate unless separately had in literary composition.Therefore, below the first element, assembly, region, layer or the part discussed can be counted as the second element, assembly, region, layer or part, and do not depart from the instruction of example embodiment.
For convenience of description, in this article can relative terms in usage space, such as " inside ", " outside ", " below ", " under ", " lower than ", " on ", " higher than " etc., describe the relation of an element as shown in the figure or feature and another element or feature.Relative terms spatially can be intended to comprise the difference location of equipment in use or operation except the location of painting in accompanying drawing.Such as, if by the equipment upset in figure, be then described as be in other element or feature " under " or the element of " below " will be positioned in other element or feature " on ".Therefore, exemplary term " under " can comprise on and under two kinds of location.This equipment can be located according to alternate manner (90-degree rotation or with other orientation), and correspondingly understand relative descriptors spatially used herein.
Provide the aforementioned description of execution mode for the purpose of illustration and description.This is not detailed or restriction the utility model.Purposes or the feature of the individual component of particular implementation, expection or statement are not limited to this particular implementation usually, but when applying, being interchangeable and can be used in selected execution mode, even if clearly do not illustrate or describe.Also above-mentioned individual component, the purposes of expection or statement or feature can be changed in many ways.These modification are not regarded as a departure from the utility model, are intended to this kind of amendment to be included in scope of the present utility model.
Claims (16)
1. a DC voltage limiting circuit, comprising:
Electric current supply portion, described electric current supply portion is configured to receiver voltage input signal and provides voltage to output signal;
Protection portion, described protection portion is configured at least temporarily limit based on the amplitude of described voltage input signal or stop the operation in described electric current supply portion; And
Voltage level control part, described voltage level control part is configured to described voltage output signal to be restricted to predetermined voltage level;
Described DC voltage limiting circuit is arranged in atmosphere control system controller.
2. DC voltage limiting circuit according to claim 1, wherein, described electric current supply portion comprises:
The first transistor and transistor seconds, each transistor has emitter, described emitter is configured to provide the electric current flowing through switch to output signal to provide described voltage, described transistor seconds has the base stage of connecting with the first Zener diode, and described first Zener diode has the negative electrode back to described base stage;
Described the first transistor is configured to, and when described voltage input signal has the voltage lower than the Zener voltage of described first Zener diode, supply flow is through the electric current of described switch; And
Described transistor seconds is configured to, and when the voltage of described voltage input signal exceedes the Zener voltage of described first Zener diode, supply flow is through the electric current of described switch.
3. DC voltage limiting circuit according to claim 2, wherein, described protection portion comprises:
Second Zener diode, the Zener voltage of described second Zener diode is higher than the Zener voltage of described first Zener diode, and described second Zener diode is connected between the grid of described switch and the source electrode of described switch; And
Described protection portion is configured to the operation controlling described switch.
4. DC voltage limiting circuit according to claim 3, wherein, described voltage level control part comprises third transistor, described third transistor has by the 3rd Zener diode and exports with voltage the base stage be connected, and described 3rd Zener diode has the Zener voltage corresponding to described predetermined voltage level.
5. DC voltage limiting circuit according to claim 4, wherein, described first Zener diode has the Zener voltage of 8.2 volts, and described second Zener diode has the Zener voltage of 16 volts, and described 3rd Zener diode has the Zener voltage of 30 volts.
6. DC voltage limiting circuit according to claim 1, wherein, described electric current supply portion comprises the first transistor and transistor seconds that are in Darlington configuration, and described the first transistor and described transistor seconds are configured to receive described voltage input signal and export with described voltage and be connected.
7. DC voltage limiting circuit according to claim 6; wherein; described protection portion comprises the first Zener diode; described first Zener diode is connected between the input of described voltage and the base stage of third transistor, and described protection portion is configured to limit the operation of a transistor in the transistor being in the configuration of described Darlington.
8. DC voltage limiting circuit according to claim 7, wherein, described voltage level control part comprises the 4th transistor, described 4th transistor has by the second Zener diode and exports with described voltage the base stage be connected, and described second Zener diode has the Zener voltage corresponding to described predetermined voltage level.
9. DC voltage limiting circuit according to claim 1, wherein, described voltage input signal is provided by stealing circuit, and described voltage output signal is used for powering to described controller.
10. according to DC voltage limiting circuit in any one of the preceding claims wherein, wherein, described atmosphere control system controller comprises thermostat, and/or wherein, described predetermined voltage level is 30 volts.
11. 1 kinds of DC voltage limiting circuits, comprising:
The first transistor and transistor seconds, described the first transistor and described transistor seconds are configured to receiver voltage input signal, each transistor has emitter, described emitter is configured to provide the electric current flowing through switch to output signal to provide voltage, described transistor seconds has the base stage of connecting with the first Zener diode, and described first Zener diode is relative to described voltage input signal reverse biased;
Second Zener diode, the Zener voltage of described second Zener diode is higher than the Zener voltage of described first Zener diode, and described second Zener diode to be connected between the grid of described switch and the source electrode of described switch and relative to described grid reverse biased; And
Third transistor, described third transistor has by the 3rd Zener diode and exports with voltage the base stage be connected, and described 3rd Zener diode exports reverse biased and the Zener voltage had corresponding to predetermined voltage level relative to described voltage.
12. DC voltage limiting circuits according to claim 11, wherein:
Described the first transistor is configured to, and when Zener voltage lower than described first Zener diode of the voltage of described voltage input signal, supply flow is through the electric current of described switch; And
Described transistor seconds is configured to, and when the voltage of described voltage input signal exceedes the Zener voltage of described first Zener diode, supply flow is through the electric current of described switch.
13. DC voltage limiting circuits according to claim 11, also comprise the diode of connecting with described 3rd Zener diode.
14. DC voltage limiting circuits according to claim 11, wherein, described predetermined voltage level is 30 volts.
15. 1 kinds of atmosphere control system controllers, comprise the DC voltage limiting circuit according to any one of claim 11 to 14.
16. 1 kinds of thermostats, comprise the DC voltage limiting circuit according to any one of claim 11 to 14.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520126797.XU CN204517685U (en) | 2015-03-04 | 2015-03-04 | Direct voltage limiting circuit, atmosphere control system controller and thermostat |
| US14/661,116 US9870008B2 (en) | 2015-03-04 | 2015-03-18 | Systems and methods for limiting DC voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520126797.XU CN204517685U (en) | 2015-03-04 | 2015-03-04 | Direct voltage limiting circuit, atmosphere control system controller and thermostat |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204517685U true CN204517685U (en) | 2015-07-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520126797.XU Withdrawn - After Issue CN204517685U (en) | 2015-03-04 | 2015-03-04 | Direct voltage limiting circuit, atmosphere control system controller and thermostat |
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| Country | Link |
|---|---|
| CN (1) | CN204517685U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105991049A (en) * | 2015-03-04 | 2016-10-05 | 艾默生电气公司 | System and method for limiting DC voltage |
-
2015
- 2015-03-04 CN CN201520126797.XU patent/CN204517685U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105991049A (en) * | 2015-03-04 | 2016-10-05 | 艾默生电气公司 | System and method for limiting DC voltage |
| CN105991049B (en) * | 2015-03-04 | 2019-03-15 | 艾默生电气公司 | System and method for limiting DC voltage |
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Granted publication date: 20150729 Effective date of abandoning: 20190315 |