CN105991049B - System and method for limiting DC voltage - Google Patents
System and method for limiting DC voltage Download PDFInfo
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- CN105991049B CN105991049B CN201510097301.5A CN201510097301A CN105991049B CN 105991049 B CN105991049 B CN 105991049B CN 201510097301 A CN201510097301 A CN 201510097301A CN 105991049 B CN105991049 B CN 105991049B
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Abstract
The invention discloses the illustrative embodiments of the system and method for limiting D/C voltage.In the exemplary embodiment, a kind of D/C voltage limiting circuit generally includes electric current supply unit, which is configured to receive voltage input signal and provides voltage output signal.The protection portion of the circuit is configured to the operation that the amplitude based on voltage input signal temporarily, at least limited or stopped electric current supply unit.Voltage level control unit is configured to voltage output signal being limited to predetermined voltage level.In some embodiments, which is arranged in atmosphere control system controller.
Description
Technical field
This patent disclosure relates generally to the system and method for limiting direct current (Direct Current, DC) voltage.
Background technique
This section provides background information related to the present invention, the not necessarily prior art.
Digital thermostat and other atmosphere control system controllers usually have microcomputer and other continue electricity consumption
Component.Various thermostats can use stealing to obtain operation power.Thus, for example, when the load (example in atmosphere control system
Such as compressor, fan or air valve) when being disconnected, the operating work for thermostat can be stolen from the circuit for the load
Rate.
Summary of the invention
This section provides general overview of the invention, is not comprehensive public affairs of full breadth or whole features of the invention
It opens.
According to various aspects, the illustrative embodiments of the system and method for limiting D/C voltage are disclosed.In example
In property embodiment, a kind of D/C voltage limiting circuit generally includes electric current supply unit, which is configured to receive electricity
Pressure input signal simultaneously provides voltage output signal.The protection portion of the circuit is configured to the amplitude based on voltage input signal at least
Temporarily limit or stop the operation of electric current supply unit.Voltage level control unit is configured to for voltage output signal being limited to pre-
Constant voltage level.In some embodiments, which is arranged in atmosphere control system controller.
In another illustrative embodiments, a kind of D/C voltage limiting circuit includes the first transistor and the second crystal
Pipe, the first transistor and second transistor are configured to receive voltage input signal, and each transistor has emitter, the hair
Emitter-base bandgap grading is configured to provide the electric current for flowing through switch to provide voltage output signal.Second transistor have with it is defeated relative to voltage
Enter the base stage of the first Zener (Zener) Diode series of signal reverse biased.Second Zener diode, which has, is higher than first together
Receive diode Zener voltage Zener voltage.Second Zener diode be connected between the grid of switch and the source electrode of switch and
Relative to the grid reverse biased.Third transistor has the base stage connecting by third Zener diode with voltage output,
Third Zener diode is relative to voltage output reverse biased and has the Zener voltage for corresponding to predetermined voltage level.
A variety of methods are also disclosed, the method for generally including limitation D/C voltage.Electric current is supplied in response to voltage input signal
To provide voltage output signal, which is held by the electric current supply unit of the D/C voltage limiting circuit of atmosphere control system controller
Row.The exemplary method includes the operation of the amplitude limitation electric current supply unit based on voltage input signal, which is limited by D/C voltage
The protection portion of circuit processed executes.The exemplary method further includes that voltage output signal is limited to predetermined voltage maximum level.
From description presented herein, other suitable application areas be will become obvious.Description in the content of present invention
Illustrative purpose is only intended to particular example, it is not intended to be limited the scope of the invention.
Detailed description of the invention
Attached drawing described herein merely for illustrating selected embodiment rather than the purpose of all possible implementation,
The range being not intended to be limiting of the invention.
Fig. 1 is the signal of the thermostat including D/C voltage limiting circuit of an example embodiment according to the present invention
Figure；
Fig. 2 is the schematic diagram of the D/C voltage limiting circuit of an example embodiment according to the present invention；With
Fig. 3 is the schematic diagram of the D/C voltage limiting circuit of an example embodiment according to the present invention.
Through these views of attached drawing, corresponding appended drawing reference indicates corresponding component.
Specific embodiment
Example embodiment is described more fully with now with reference to attached drawing.
Inventors have recognized that most atmosphere control system thermostat is exchanged using 24V to 30V
(Alternating Current, AC) input voltage is as power input, usually using AC/DC converter to obtain D/C voltage.
Then linear circuit or reduction voltage circuit can be used to reduce the voltage for energy storage device and power for thermostat system.So
And the thermostat of incorrect link may be wired to 24V transformer by client.In this case, the AC for supplying thermostat is defeated
Enter for example to can be 48V to 60V.If using thermostat after false wiring, problems of excessive heat and/or excessively electric can occur
Pressure problem.Therefore, inventor has developed and has been disclosed herein the example embodiment of D/C voltage limiting circuit, the DC
Voltage limiting circuit generally includes electric current supply unit, which is configured to receive voltage input signal and provides voltage
Output signal.The protection portion of the circuit is configured to the amplitude based on voltage input signal and temporarily, at least limits or stop electric current
The operation of supply unit.Voltage level control unit is configured to voltage output signal being limited to predetermined voltage level.
Referring now to attached drawing, Fig. 1 shows the illustrative embodiments of atmosphere control system controller (such as thermostat 10),
The thermostat 10 includes the D/C voltage limiting circuit 14 for embodying one or more aspects of the present invention.As shown in Figure 1, thermostat 10
Stealing circuit 18 for example pass through one or more loads 22 of atmosphere control system 26 and obtain electric energy, the atmosphere control system 26
In include thermostat 10.For example, as shown in Figure 1, the bridge rectifier 30 of stealing circuit 18 passes through unactivated heating or refrigeration
Load 22 is received for instance in the electric energy between 18VAC and 30VAC.It is unactivated load 22 for example can be disconnection air valve or
Compressor.Stealing circuit 18 obtains electric energy from such as transformer (not shown) by load 22, when connecting load 22, the transformation
Device is 22 power supply of load.
It should be noted that stealing circuit 18 is only exemplary.In the embodiments of the present invention, for various electric energy
Value can adopt and carry out stealing from various power supplys in various manners.It shall also be noted that various aspects according to the present invention, Ke Yishi
The now D/C voltage limiting circuit about other or additional electronic equipments and/or controller in addition to thermostat.Further
Ground, although providing various voltages and other values in various example embodiments described herein, these values are only
It is only example, and is to help and understands various embodiments and provide.
Referring again to Fig. 1, bridge rectifier 30 can provide the DC output voltage of wide scope to D/C voltage limiting circuit 14,
Such as from about 25V to about 42V.D/C voltage limiting circuit 14 makes power capacitor C1 charge to for example, about 30VDC.Voltage decline turns
Parallel operation (such as reduction voltage circuit 34) is electrically connected with D/C voltage limiting circuit 14 and is connected to the both ends capacitor C1.Reduction voltage circuit 34 to
Various thermostat circuits 42 provide the voltage output 38 of such as 3.3VDC, and thermostat circuit 42 includes but is not limited in following item
It is one or more: microprocessor 46, temperature sensor 50, humidity sensor 54, Wireless Fidelity (Wireless Fidelity,
Wi-Fi) module 58, after electric control module 62, and/or other thermostat functionality modules 66.Capacitor C1 is connected to D/C voltage limit
Between the voltage output 70 and power supply ground terminal 74 of circuit 14 processed.In this example embodiment, D/C voltage limiting circuit 14 is used for
The input voltage of limitation supply capacitor C1.Another capacitor C2 is arranged on the voltage output 38 and power ground of reduction voltage circuit
Between end 74.
An example embodiment of D/C voltage limiting circuit is indicated generally by with appended drawing reference 100 in Fig. 2.D/C voltage
Limiting circuit 100 receives voltage input signal at voltage input 104, which is, for example, to come to be included in constant temperature
The rectified AC voltage of rectification circuit (being not shown in Fig. 2) in the stealing circuit of device.D/C voltage limiting circuit 100 uses two
A capacitor C3 and C4 provides output voltage Vcap1, such as powering for thermostat load 108.Capacitor C3 and capacitor
C4 is connected between output voltage Vcap1 and ground terminal GND with parallel way.Although should be noted that in this example embodiment
Two capacitors C3 and C4 are provided, but also can provide single capacitor or more than two capacitor in other embodiments
Device.
Voltage Vcap1 changes with load 108 and the quantity of electric charge on capacitor C3 and capacitor C4.In this embodiment party
In formula, voltage Vcap1 is limited to 30VDC by D/C voltage limiting circuit 100, and loading 108 is that reduction voltage circuit (does not show in Fig. 2
Out).It is however noted that the embodiment of the various D/C voltage limiting circuits of many aspects according to the present invention can be used for by
Voltage is limited to other voltage values and/or for providing the voltage output used in other or addition type circuit.
In this example embodiment, during thermostat operation, voltage input 104 is usually between 24V and 30V.So
And when the wiring error on 24V transformer of the user by atmosphere control system is connected to the perseverance including D/C voltage limiting circuit 100
When warm device, voltage input 104 can be high singularly, such as between 48VAC and 60VAC.In this example embodiment, D/C voltage
Limiting circuit 100 is configured to, and the level that may cause overheat and/or overvoltage condition in other aspects is reached in input voltage
When, protect stealing circuit and thermostat.
Referring again to Fig. 2, small resistance is set between voltage input 104 and the rest part of D/C voltage limiting circuit 100
Device R1.The collector of resistor R1 and resistor R2, the first Zener diode CR1, resistor R3 and NPN transistor Q2
116 are connected at node 112.The emitter 120 of transistor Q2 is connect with the emitter 124 of NPN transistor Q3.Emitter
120 and emitter 124 all with Metal-Oxide Semiconductor field effect transistor (Metal-Oxide-Semiconductor
Field-Effect Transistor, MOSFET) M1 drain electrode 128 connect.It leaves at the electric current of source electrode 132 of MOSFET M1
In output voltage Vcap1.
The anode 136 of Zener diode CR1 is connect by resistor R5 with the base stage 140 of transistor Q3.Transistor Q2's
Base stage 144 is connected between resistor R3 and the collector 148 of transistor Q3 by resistor R4.The grid 152 of MOSFET M1
It is connected between resistor R2 and resistor R7.The grid 152 also by with the concatenated second Zener diode CR2 of diode D1
And it is connected at node 154 with the source electrode of MOSFET M1 132.The cathode 156 of Zener diode CR2 and the anode of diode D1
160 are directed to node 154.
The collector 164 of NPN transistor Q1 passes through resistor R1, resistor R2 and resistor R7 and voltage input 104
Connection.Leave the current direction ground terminal GND of the emitter 168 of transistor Q1.Third Zener diode CR3 and resistor R6 and crystalline substance
The base stage 172 of body pipe Q1 is connected, and receives the electric current output in output voltage Vcap1 from MOSFET source 132.Zener
The anode 176 and cathode 180 of diode CR3 is directed to transistor Q1 and resistor R6 respectively.In this example embodiment, together
Receiving diode CR1, Zener diode CR2 and Zener diode CR3 respectively has different Zener voltages, wherein neat at three
It receives in voltage, the Zener voltage of CR1 is minimum, the Zener voltage highest of CR3.
In operation, transistor Q2 and transistor Q3 supplies electric current to D/C voltage limiting circuit 100.MOSFET M1 conduct
Switch, to transmit and cut off from the received electric current of transistor Q2 and transistor Q3 institute.Transistor Q1 and Zener diode CR3 fill
Work as switch controller, for the level of output voltage Vcap1 to be limited to the Zener voltage of Zener diode CR3.Two pole of Zener
Pipe CR2 and diode D1 is used to protect D/C voltage limiting circuit 100 from by abnormal high input voltage.
For example, when the signal at voltage input 104 has the voltage of the Zener voltage lower than Zener diode CR1, electricity
The emitter 120 that stream flows through transistor Q2 reaches MOSFET M1.Electric current also flows through the grid 152 of MOSFETM1, positive grid-
Source voltage makes MOSFET M1 switch to conducting and is held on.Electric current flows through MOSFET M1 to capacitor C3 and capacitor
C4 charging.When voltage signal at voltage input 104 is more than the Zener voltage of CR1, electric current flows through transistor Q3 and MOSFET
M1, so that output voltage Vcap1 can be used at load 108 and capacitor C3 and capacitor C4.
When voltage at Zener diode CR2 is more than the Zener voltage of CR2, electric current flows through Zener diode CR2 and two
The source electrode 132 of pole pipe D1 access switch M1, limitation grid voltage are reduced to protect MOSFET M1.Electric current can then flow through crystalline substance
Body pipe Q2 and/or transistor Q3 is to provide voltage Vcap, such as previously described.Thus, for example if false wiring constant temperature
Abnormal high voltage signal is received at the voltage input 104 of device, then can protect D/C voltage limiting circuit 100.Show at one
In example embodiment, Zener diode CR1 has the Zener voltage of 8.2V, and Zener diode CR2 has the Zener voltage of 16V.
It is set when voltage Vcap1 has reached the Zener voltage according to Zener diode CR3 of D/C voltage limiting circuit 100
When the upper limit (such as the 30V) set, electric current flows through the base stage 172 of Zener diode CR3 and transistor Q1.Then electric current flows through crystal
The collector 164 and emitter 168 of pipe Q1 reach ground terminal GND, until voltage Vcap1 return to it is neat less than Zener diode CR3
Receive the voltage level of voltage.
The example components of D/C voltage limiting circuit 100 are as follows:
R1:12 Ω
R2:43K Ω
R3:0.96K Ω
R4:1K Ω
R5:3.9K Ω
R6:10K Ω
R7:20K Ω
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 D/C voltage limiting circuit is indicated generally by with appended drawing reference 200 in Fig. 3.DC electricity
Pressure limiting circuit 200 receives voltage input signal at voltage input 204, which is, for example, to come to be included in perseverance
The rectified AC voltage of rectification circuit (being not shown in Fig. 3) in the stealing circuit of warm device.D/C voltage limiting circuit 200 uses
Two capacitors C5 and C6 provide output voltage Vcap2, such as powering for thermostat load 208.Capacitor C5 and capacitor
Device C6 is connected between output voltage Vcap2 and ground terminal GND with parallel way.Although should be noted that in this example embodiment
In provide two capacitors C5 and C6, but also can provide single capacitor or more than two capacitor in other embodiments
Device.
Voltage Vcap2 changes with load 208 and the quantity of electric charge on capacitor C5 and capacitor C6.In this embodiment party
In formula, voltage Vcap2 is limited to 30VDC by D/C voltage limiting circuit 200, and loading 208 is that reduction voltage circuit (does not show in Fig. 3
Out).It is however noted that the embodiment of the various D/C voltage limiting circuits of many aspects according to the present invention can be used for by
Voltage is limited to other voltage values and/or for providing the voltage output used in other or addition type circuit.
In this example embodiment, during thermostat operation, voltage input 204 is usually between 24V and 30V.So
And when the wiring error on the 24V transformer of atmosphere control system is connected to the perseverance including D/C voltage limiting circuit 200 by user
When warm device, voltage input 204 can be high singularly, such as between 48VAC and 60VAC.In this example embodiment, D/C voltage
Limiting circuit 200 is configured to, and the level that may cause overheat and/or overvoltage condition in other aspects is reached in input voltage
When, protect stealing circuit and thermostat.
Referring again to Fig. 3, small resistance is set between voltage input 204 and the rest part of D/C voltage limiting circuit 200
Device R8.Resistor R8 and resistor R9, the collector 216 of NPN transistor Q4, NPN transistor Q5 collector 220, with
And resistor R10 is connected at node 212, resistor R10 connects with Zener diode CR4.Several series connection can be provided
Resistor replace single resistor R9.In addition, usually it should be noted that being described herein as comprising in various embodiments
Various assemblies can be replaced in some cases by various functionally equivalent components.
It is right that transistor Q4 and transistor Q5 is configured to Darlington (Darlington).That is, transistor Q4 and transistor Q5
Connect as follows: the electric current that one of transistor is amplified is further amplified by another transistor.In each embodiment party
In formula, compared to each transistor individually used, Darlington configuration can provide higher public pole/emitter current
Gain.The emitter 224 of transistor Q4 connects at node 228 with the base stage 232 of transistor Q5.Resistor R11 is connected to crystalline substance
Between the base stage 236 and node 228 of body pipe Q4.Resistor R12 is connected between node 228 and the emitter 240 of transistor Q5.
The electric current in voltage Vcap2 for 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 to base stage 236
Between the collector 244 of NPN transistor Q7.The emitter 248 of transistor Q7 is connected to ground terminal GND.Zener diode CR5
Anode 252 connect with the base stage 256 of transistor Q7.Resistor R14 is connected to the cathode 260 and output voltage of transistor Q7
Between Vcap2.The anode 262 of Zener diode CR4 is connect with the base stage 264 of NPN transistor Q6.The collector of transistor Q6
268 connect with node 228.The electric current for leaving the emitter 272 of transistor Q6 is in output voltage Vcap2.
In operation, Darlington transistor Q4 and transistor Q5 supplies electric current to D/C voltage limiting circuit 200.Crystal
Pipe Q7 and Zener diode CR5 serves as switch controller, and for the level of output voltage Vcap2 to be limited to Zener diode
The Zener voltage of CR5, in this example embodiment, the Zener voltage of Zener diode CR5 is 30V.Zener diode CR4 and
Transistor Q6 is for protecting transistor Q5 from being overheated.When transistor Q5 stops supply electric current (as described below), transistor
Q4 can continue to capacitor C5, capacitor C6 and 208 supply electric current of load.
When signal at voltage input 204 has the voltage of the Zener voltage lower than Zener diode CR4, electric current is flowed through
Transistor Q4 and transistor Q5, to provide voltage Vcap2 at capacitor C5, capacitor C6 and load 208.Work as voltage input
When signal voltage at 204 is more than Zener voltage (being 9.1V in this example embodiment) of CR4, electric current starts from transistor
The emitter 224 of Q4 flow to the base stage 264 of transistor Q6 by the collector 268 and emitter 272 of transistor Q6.When basic
On when being slowed or shut off the electric current flowing by transistor Q5, transistor Q4 continues to supply electric current.
It is set when voltage Vcap2 has reached the Zener voltage according to Zener diode CR5 of D/C voltage limiting circuit 200
When the upper limit (such as the 30V) set, electric current flows through the base stage 256 of Zener diode CR5 and transistor Q7.Then electric current flows through crystal
The collector 244 of pipe Q7 reaches ground terminal GND.
When voltage input 204 is abnormal high, high voltage input is converted into filling to capacitor C5 and capacitor C6 by circuit 200
The electric current of electricity, so that the output voltage of capacitor is restricted to desired value.In this manner, high voltage input can be prevented straight
Supply subsequent conditioning circuit, the capacitor C1 and/or reduction voltage circuit 34 of example as shown in figure 1 are met, to be, for example, that wrong installation scenarios mention
For protection.
The example components of D/C voltage limiting circuit 200 are as follows:
R8:12 Ω
R9:600K Ω
R10:4.7K Ω
R11:10K Ω
R12:10K Ω
R13:5.1K Ω
R14:10K Ω
Q4:NSS60201
Q5:FCX493
Q6:NSS60201
Q7:NSS60201
CR4:MMSZ4696, Vz=9.1V
CR5:MMSZ4713, Vz=30V
C5:820uf
C6:820uf
The embodiment of aforementioned circuit and method can provide the low cost limitation of D/C voltage, various electricity in various circuits
Road includes but is not limited to the stealing circuit for being used for atmosphere control system thermostat.Various embodiments can be used for it is low at
This offer has the considerable power supply of low-power consumption.For example, if setter is not properly connected together 24V transformer and constant temperature
Device, then the embodiment of aforementioned circuit can protect thermostat by avoiding overheating and preventing overvoltage condition.Various implementations
Mode can make it possible to supply enough electric currents to power termination and simultaneously by output voltage control to desired value.For manufacture
For lower wattage power supply and/or battery powered application product, all components are that the embodiment of linear modules can be inexpensively
, this is particularly advantageous in thermostat.In various embodiments, it can provide with comparable current output capability
Common DC/DC voltage limiting circuit.This circuit can provide wide AC input range with low cost, and its energy consumption is horizontal
It is low.Such as compared to DC/DC reduction voltage circuit, use MOSFET as the embodiment of switch can easily with low cost into
Row configuration.
Therefore, in the various embodiments of the present invention, D/C voltage limiting circuit includes: electric current supply unit, which supplies
It is configured to receive voltage input signal to portion and voltage output signal is provided；Protection portion, the protection portion are configured to based on electricity
The amplitude of pressure input signal temporarily, at least limits or stops the operation of electric current supply unit；And voltage level control unit, the electricity
Voltage level control unit is configured to voltage output signal being limited to predetermined voltage level；The D/C voltage limiting circuit is arranged on
In atmosphere control system controller.
In some embodiments, electric current supply unit includes the first transistor and second transistor, and each transistor has
Emitter, which, which is configured to provide, flows through the electric current of switch to provide voltage output signal, second transistor have with
The concatenated base stage of first Zener diode, the first Zener diode have the cathode back to the base stage；The first transistor is configured
At when voltage input signal has the voltage lower than the Zener voltage of the first Zener diode, supply flows through the electric current of switch；
And second transistor is configured to, and when the voltage of voltage input signal is more than the Zener voltage of the first Zener diode, is supplied
To the electric current for flowing through switch.
In some embodiments of D/C voltage limiting circuit, protection portion includes the second Zener diode, the second Zener two
The Zener voltage of pole pipe is higher than the Zener voltage of the first Zener diode, and the second Zener diode is connected to the grid of switch and opens
Between the source electrode of pass；And protection portion is configured to the operation of control switch.
In some embodiments of D/C voltage limiting circuit, voltage level control unit includes third transistor, the third
Transistor has the base stage connecting by third Zener diode with voltage output, and third Zener diode, which has, to be corresponded in advance
The Zener voltage of constant voltage level.
In some embodiments of D/C voltage limiting circuit, the first Zener diode has 8.2 volts of Zener voltage, the
Two Zener diodes have 30 volts of Zener voltage with 16 volts of Zener voltage and third Zener diode.
In some embodiments, electric current supply unit includes the first transistor and the second crystalline substance in Darlington configuration
Body pipe, the first transistor and second transistor are configured to receive voltage input signal and connect with voltage output.
In some embodiments of D/C voltage limiting circuit, protection portion includes being connected to voltage input and third transistor
Base stage between the first Zener diode and protection portion be configured to limit in Darlington configuration transistor in
A transistor operation.
In some embodiments of D/C voltage limiting circuit, voltage level control unit include the 4th transistor, the 4th
Transistor has the base stage connecting by the second Zener diode with voltage output, which, which has, corresponds to
The Zener voltage of predetermined voltage level.
In some embodiments of D/C voltage limiting circuit, voltage input signal is provided by stealing circuit, and voltage is defeated
Signal is used to power to controller out.
In some embodiments of D/C voltage limiting circuit, atmosphere control system controller includes thermostat.
In various implementations, the method for limiting D/C voltage includes: in response to voltage input signal supply electric current to mention
Voltage supplied output signal, the supply are executed by the electric current supply unit of the D/C voltage limiting circuit of atmosphere control system controller；Base
In the operation of the amplitude limitation electric current supply unit of voltage input signal, which is executed by the protection portion of D/C voltage limiting circuit；
And voltage output signal is limited to predetermined voltage maximum level.
In some implementations, method includes being powered using voltage output signal to controller.
In various embodiments, D/C voltage limiting circuit includes: the first transistor and second transistor, the first crystal
Pipe and second transistor are configured to receive voltage input signal, and each transistor has emitter, which is configured to
There is provided and flow through the electric current of switch to provide voltage output signal, second transistor have with it is reversely inclined relative to voltage input signal
The concatenated base stage of the first Zener diode of pressure；Second Zener diode, the Zener voltage of second Zener diode are higher than the
The Zener voltage of Zener diode, the second Zener diode be connected between the grid of switch and the source electrode of switch and relative to
The grid reverse biased；And third transistor, which, which has, passes through third Zener diode and voltage output
The base stage of connection, the third Zener diode is relative to voltage output reverse biased and has corresponding to the neat of predetermined voltage level
Receive voltage.
In some embodiments of D/C voltage limiting circuit, the first transistor is configured to, when voltage input signal
When voltage is lower than the Zener voltage of the first Zener diode, supply flows through the electric current of switch；And second transistor is configured to,
When the voltage of voltage input signal is more than the Zener voltage of the first Zener diode, the electric current for flowing through switch is provided.
In some embodiments, D/C voltage limiting circuit includes and the concatenated diode of third Zener diode.
In some embodiments of D/C voltage limiting circuit, predetermined voltage level is 30 volts.
In various embodiments, atmosphere control system controller includes D/C voltage limiting circuit.
In various embodiments, thermostat includes D/C voltage limiting circuit.
Example embodiment is provided, so that the present invention is detailed, and will be given full expression to those skilled in the art
Its range.Many details, such as the example of specific component, device and method are proposed, to provide to embodiment party of the invention
The comprehensive understanding of formula.It will be apparent to one skilled in the art that not necessarily using detail, can be embodied in many different forms
Example embodiment, and detail and example embodiment are not construed as limiting the scope of the invention.In some examples
In embodiment, it is not described in known process, known device structure and known technology.In addition, utilizing the present invention
The accessible advantage of one or more illustrative embodiments and improve be provided merely for illustrative purpose, be not intended to limit
The scope of the present invention, for example, illustrative embodiments disclosed herein can provide all above-mentioned advantages and improve or not mention
For any of above advantage and improvement, but still within the scope of the present invention.
Specific size, specific material and/or concrete shape disclosed herein are example in nature, are not intended to limit this
The range of invention.Particular value disclosed herein for given parameters and specific value range do not exclude to be used in herein
Disclosed in example in one or more examples in other values and value range.Furthermore it is anticipated that set forth herein
Any two particular value for design parameter can limit the endpoint for the value range for being applicable to given parameters (that is, being directed to
First value of given parameters and the disclosure of second value can be construed as disclosing the arbitrary value between the first value and second value
It can be used for given parameter).For example, if citing proves that parameter X has value Z with value A and also herein, it can be pre-
See, parameter X can have the value range from about A to about Z.Similarly, it is contemplated that for two or more value ranges of parameter
(no matter these ranges whether be it is nested, it is overlapping or distinguishing) disclosure include for the value range all possibility
Combination, can be used the endpoint of disclosed range above-mentioned all possible combinations are claimed.For example, if citing herein
Prove that parameter X has the value in range 1-10 or 2-9 or 3-8, then it is also contemplated that parameter X can have other value ranges, including
1-9,1-8,1-3,1-2,2-10,2-8,2-3,3-10 and 3-9.
Term used herein is not intended to constitute limit merely for describing the purpose of specific example embodiment
System.As used herein, singular " one " and "the" can be intended to also include plural form, unless clearly referring to
Show.The terms "include", "comprise" and " having " are all non-exclusive, it is therefore intended that there are listed feature, integer, steps
Suddenly, operation, element and/or component, but be not precluded presence or add one or more of the other feature, integer, step, operation,
Element, component and/or combination thereof.Method and step, process and operation described herein are not necessarily to be construed as necessarily requiring it
It is realized according to certain order that is being discussed or showing, realizes order unless specified.It will also be understood that can be using additional
Or alternative step.
When element or layer be referred on another element or layer, be incorporated to another element or layer, be connected to another element or
Layer or when being coupled to another element or layer, the element or layer can directly on another element or layer, be incorporated to another element or
Layer is connected to another element or layer or is coupled to another element or layer, or there may be elements or layer between.Instead
It, when element be referred to as directly on another element or layer, be directly incorporated into another element or layer, be directly connected to another element
Or layer or when being directly coupled to another element or layer, there is no elements or layer between.It should understand in a similar way
For describing other sayings of the relationship between element (for example, " between " comparison " directly between ", " adjacent "
Compare " direct neighbor " etc.).As used herein, term "and/or" includes one or more of associated institute's list
Any combination and all combinations.
Term " about " refers to that calculate or measure some of permissible value slightly inaccurately (connects very much when being applied to value
Nearly exact value；Approximately or reasonably close on exact value；Almost exact value).If for some reason, in the art, cannot
Using ordinary meaning understand " about " provided by it is inaccurate, then " about " used herein at least instruction can produce in measurement or
Use the modification of the conventional method of this kind of parameter.For example, term " usual ", " about " and " substantially " one's purpose in coming can be used herein
Refer within manufacturing tolerance.Alternatively, for example, when modifying the amount of of the invention or used component part or reactant, this
Term " about " as used herein refers to can be by used general measure and treatment process (for example, when passing through these
The mistake neglected in the process and when being concentrated or dissolved in real world), by for manufacturing synthetic or executing method
Manufacturing process, the difference of purity of raw material, component part etc. and lead to the variations of the numerical quantities occurred.Term " about " also includes
The specific original mixture of reason is formed by the different equilibrium conditions of synthetic and leads to different amounts.Whether term is used
" about " it modifies, claim includes being equal to this tittle.
Although term first, second, third, etc. can be used herein come describe each element, component, region, layer and/or
Part, but these elements, component, regions, layers, and/or portions should not be limited by these terms.These terms can be used only
In one element of differentiation, component, region, layer or part and another element, component, region, layer or part.It is used herein
Such as term of " first ", " second " and other numerical value terms and do not imply that order or sequence, unless clearly referring to
Show.Therefore, the first element that is discussed below, component, region, layer or part can be counted as second element, component, region,
Layer or part, without departing from the introduction of example embodiment.
For the convenience of description, relative terms spatially can be used herein, for example, " inside ", " outside ", " under
Face ", " under ", " being lower than ", " on ", " being higher than " etc., to describe an elements or features and another element as shown in the figure
Or the relationship of feature.Relative terms spatially can be intended to encompass equipment in use or operation in addition to that is drawn in attached drawing determines
Different positioning except position.For example, if by figure equipment overturn, be described as be in other elements or features " under " or
The element of " following " will be positioned in other elements or features " on ".Therefore, exemplary term " under " may include it
Upper two kinds of positioning under.It (can be rotated by 90 ° or with other orientations) otherwise and position the equipment, and correspondingly
Understand relative descriptors spatially used herein.
Provide the foregoing description of embodiment for the purpose of illustration and description.This is not in detail or to limit this
Invention.Individual component, expection or the purposes of statement or feature of particular implementation are generally not limited to the particular implementation side
Formula, but in use, be interchangeable and can be used in selected embodiment, even if being not explicitly shown or described.It can also be with
It is varied in many ways above-mentioned individual component, expection or the purposes of statement or feature.These modifications are not regarded as departure from this hair
It is bright, it is intended that be included within the scope of the invention this kind of modification.
Claims (16)
1. a kind of DC voltage limiting circuit, comprising:
Electric current supply unit, the electric current supply unit are configured to receive voltage input signal and provide voltage output signal；
Protection portion, the protection portion are configured to the amplitude based on the voltage input signal and temporarily, at least limit or stop institute
State the operation of electric current supply unit；And
Voltage level control unit, the voltage level control unit are configured to the voltage output signal being limited to predetermined voltage
Level；
The DC voltage limiting circuit is arranged in atmosphere control system controller；
Wherein, the electric current supply unit includes:
The first transistor and second transistor, each transistor have emitter, and the emitter is configured to provide and flow through out
The electric current of pass to provide the voltage output signal, the second transistor have with the concatenated base stage of the first Zener diode,
First Zener diode has the cathode back to the base stage；
The first transistor is configured to, when the voltage input signal has the Zener lower than first Zener diode
When the voltage of voltage, supply flows through the electric current of the switch；And
The second transistor is configured to, when the voltage input signal is more than the Zener voltage of first Zener diode
When, supply flows through the electric current of the switch；
Wherein, the DC voltage limiting circuit further includes the second Zener diode, and second Zener diode is connected to institute
It states between the grid of switch and the source electrode of the switch.
2. DC voltage limiting circuit according to claim 1, wherein
The Zener voltage of second Zener diode is higher than the Zener voltage of first Zener diode；And
The protection portion is configured to control the operation of the switch.
3. DC voltage limiting circuit according to claim 1, further includes third transistor, the third transistor has
The base stage being connect by third Zener diode with voltage output, the third Zener diode, which has, corresponds to described make a reservation for
The Zener voltage of voltage level.
4. DC voltage limiting circuit according to claim 3, wherein first Zener diode is with 8.2 volts
Zener voltage, second Zener diode have 30 volts with 16 volts of Zener voltage and the third Zener diode
Zener voltage.
5. DC voltage limiting circuit according to claim 1, wherein the voltage input signal is mentioned by stealing circuit
For, and the voltage output signal is used to power to the controller.
6. a kind of DC voltage limiting circuit, comprising:
Electric current supply unit, the electric current supply unit are configured to receive voltage input signal and provide voltage output signal；
Protection portion, the protection portion are configured to the amplitude based on the voltage input signal and temporarily, at least limit or stop institute
State the operation of electric current supply unit；And
Voltage level control unit, the voltage level control unit are configured to the voltage output signal being limited to predetermined voltage
Level；
The DC voltage limiting circuit is arranged in atmosphere control system controller；
Wherein, the electric current supply unit includes the first transistor and second transistor in Darlington configuration, and described first is brilliant
Body pipe and the second transistor are configured to receive the voltage input signal and connect with voltage output, and
Wherein, the protection portion includes the first Zener diode, and first Zener diode is connected to voltage input and third
Between the base stage of transistor, the protection portion is configured to limit a crystal in the transistor in Darlington configuration
The operation of pipe.
7. DC voltage limiting circuit according to claim 6, wherein the voltage level control unit includes the 4th crystal
Pipe, the 4th transistor have the base stage connecting by the second Zener diode with the voltage output, and described second is neat
Diode of receiving has the Zener voltage corresponding to the predetermined voltage level.
8. DC voltage limiting circuit described in any one of -7 according to claim 1, wherein the atmosphere control system control
Device includes thermostat, and/or wherein, and the predetermined voltage level is 30 volts.
9. a kind of method for limiting DC voltage, comprising:
Electric current is supplied in response to voltage input signal to provide voltage output signal, and the supply is by atmosphere control system controller
DC voltage limiting circuit electric current supply unit execute；
Amplitude based on the voltage input signal limits the operation of the electric current supply unit, and the limitation is by the DC voltage
The protection portion of limiting circuit executes；And
The voltage output signal is limited to predetermined voltage maximum level；
Wherein, the electric current supply unit includes:
The first transistor and second transistor, each transistor have emitter, and the emitter is configured to provide and flow through out
The electric current of pass to provide the voltage output signal, the second transistor have with the concatenated base stage of the first Zener diode,
First Zener diode has the cathode back to the base stage；
The first transistor is configured to, when the voltage input signal has the Zener lower than first Zener diode
When the voltage of voltage, supply flows through the electric current of the switch；And
The second transistor is configured to, when the voltage input signal is more than the Zener voltage of first Zener diode
When, supply flows through the electric current of the switch；
Wherein, the DC voltage limiting circuit further includes the second Zener diode, and second Zener diode is connected to institute
It states between the grid of switch and the source electrode of the switch.
10. according to the method described in claim 9, further including being powered using the voltage output signal to the controller.
11. a kind of DC voltage limiting circuit, comprising:
The first transistor and second transistor, the first transistor and the second transistor are configured to receive voltage input
Signal, each transistor have emitter, and the emitter is configured to provide the electric current for flowing through switch to provide voltage output
Signal, the second transistor have with the concatenated base stage of the first Zener diode, first Zener diode is relative to institute
State voltage input signal reverse biased；
Second Zener diode, the Zener voltage of second Zener diode are higher than the Zener electricity of first Zener diode
Pressure, second Zener diode are connected between the grid of the switch and the source electrode of the switch and relative to the grid
Reverse biased；And
Third transistor, the third transistor have the base stage connecting by third Zener diode with voltage output, institute
Third Zener diode is stated relative to the voltage output reverse biased and there is the Zener voltage for corresponding to predetermined voltage level.
12. DC voltage limiting circuit according to claim 11, in which:
The first transistor is configured to, when the voltage of the voltage input signal is neat lower than first Zener diode
Receive voltage when, supply flows through the electric current of the switch；And
The second transistor is configured to, when the voltage input signal is more than the Zener voltage of first Zener diode
When, supply flows through the electric current of the switch.
13. DC voltage limiting circuit according to claim 11 further includes concatenated with second Zener diode
Diode.
14. DC voltage limiting circuit according to claim 11, wherein the predetermined voltage level is 30 volts.
15. a kind of atmosphere control system controller, including the DC voltage limitation as described in any one of claim 11 to 14
Circuit.
16. a kind of thermostat, including the DC voltage limiting circuit as described in any one of claim 11 to 14.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510097301.5A CN105991049B (en) | 2015-03-04 | 2015-03-04 | System and method for limiting DC voltage |
| 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 |
|---|---|---|---|
| CN201510097301.5A CN105991049B (en) | 2015-03-04 | 2015-03-04 | System and method for limiting DC voltage |
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| Publication Number | Publication Date |
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| CN105991049A CN105991049A (en) | 2016-10-05 |
| CN105991049B true CN105991049B (en) | 2019-03-15 |
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| CN201510097301.5A Expired - Fee Related CN105991049B (en) | 2015-03-04 | 2015-03-04 | System and method for limiting DC voltage |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5057714A (en) * | 1989-05-30 | 1991-10-15 | Nec Corporation | BiCMOS integrated circuit device utilizing Schottky diodes |
| CN101106329A (en) * | 2006-07-12 | 2008-01-16 | 电力集成公司 | Method and apparatus for high voltage power supply circuit |
| CN103812346A (en) * | 2012-11-12 | 2014-05-21 | 苏州工业园区新宏博通讯科技有限公司 | Super-high voltage input switch power source module |
| CN204517685U (en) * | 2015-03-04 | 2015-07-29 | 艾默生电气公司 | Direct voltage limiting circuit, atmosphere control system controller and thermostat |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013058820A1 (en) * | 2011-10-21 | 2013-04-25 | Nest Labs, Inc. | User-friendly, network connected learning thermostat and related systems and methods |
-
2015
- 2015-03-04 CN CN201510097301.5A patent/CN105991049B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5057714A (en) * | 1989-05-30 | 1991-10-15 | Nec Corporation | BiCMOS integrated circuit device utilizing Schottky diodes |
| CN101106329A (en) * | 2006-07-12 | 2008-01-16 | 电力集成公司 | Method and apparatus for high voltage power supply circuit |
| CN103812346A (en) * | 2012-11-12 | 2014-05-21 | 苏州工业园区新宏博通讯科技有限公司 | Super-high voltage input switch power source module |
| CN204517685U (en) * | 2015-03-04 | 2015-07-29 | 艾默生电气公司 | Direct voltage limiting circuit, atmosphere control system controller and thermostat |
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| CN105991049A (en) | 2016-10-05 |
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