CN203104328U - DC-AC (Direct Current-Alternating Current) switching circuit with ultralow input voltage - Google Patents
DC-AC (Direct Current-Alternating Current) switching circuit with ultralow input voltage Download PDFInfo
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- CN203104328U CN203104328U CN2013200971533U CN201320097153U CN203104328U CN 203104328 U CN203104328 U CN 203104328U CN 2013200971533 U CN2013200971533 U CN 2013200971533U CN 201320097153 U CN201320097153 U CN 201320097153U CN 203104328 U CN203104328 U CN 203104328U
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- transformer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a DC-AC (Direct Current-Alternating Current) switching circuit with an ultralow input voltage. The DC-AC switching circuit comprises a transformer, a depletion-mode field effect transistor, a first capacitor and a second capacitor, wherein one end of the primary side of the transformer is connected with an input direct-current voltage, and the other end of the primary side of the transformer is connected with a drain electrode of the depletion-mode field effect transistor; one end of the secondary side of the transformer is connected with an output voltage, and the other end of the secondary side of the transformer is grounded; the end, connected with the input voltage, of the primary side of the transformer and the end, connected with the output voltage, of the secondary side of the transformer are dotted terminals; a source electrode of the depletion-mode field effect transistor is grounded, and a grid electrode of the depletion-mode field effect transistor is connected with the output voltage; the first capacitor is connected between the input voltage and the ground in series; and the second capacitor is connected between the output voltage and the ground in series. According to the DC-AC switching circuit, a parasitic capacitor between the grid electrode and the source electrode of the field effect transistor is connected with the second capacitor in parallel, a capacitance value after parallel connection is determined by a capacitance value of the second capacitor, and therefore the resonant frequency of the DC-AC switching circuit is stable and controllable.
Description
Technical field
The utility model belongs to small energy acquisition field, and the utmost point low voltage and direct current that is specifically related to gather can be transformed to the change-over circuit of big amplitude voltage AC energy.
Background technology
In many occasions, the power supply of electronic device adopts wired power supply or powered battery inconvenience even may not.In a large amount of embedded materials of the wireless senser in intelligent building, body of wall, work as running down of battery, can't change electric battery; Be used to detect the wireless senser of crop growth in the open air in the agricultural, change battery and will spend a large amount of manpower and materials; The medical device that implants in implantable medical is changed battery and may be brought painful and risk etc. to human body.Therefore, adopt " self energizing " device of collecting the environmental energy power supply to arise at the historic moment.Can be by the heat energy in the environment, solar energy, vibrational energy be converted into electric energy, to the electronic device power supply, but there are shortcomings such as the too little and energy of energy density is discontinuous usually in such energy acquisition mode.When thermal gradient energy being converted into electric energy such as the employing thermoelectric generator, according to Seebeck effect, the elementary cell of each thermoelectric generator produces the electromotive force of about 0.2mV/K, if hundreds of elementary cell series connection, also can only produce the thermal voltage of hundreds of mV, far below current electronic device operate as normal required voltage.And under the application scenario of many limited space, the elementary cell of thermoelectric generator can not be connected again too much, therefore, how to utilize so low thermal voltage, and being needs one of key issue that solves.
Existing low input can be promoted the problem of solving,, be rectified into required direct voltage again and power to electronic device as earlier low-voltage direct being promoted the interchange that converts high voltage to.At present, low-voltage direct promoted and not by means of the mode of other power supplys, there are two kinds: the one, utilize switch of MEMS (micro electro mechanical system) design, this switch opens or closes according to the vibration of device, and the Switching Power Supply translation circuit of design can promote input voltage; The 2nd, utilize oscillator of design of transformer of high transformation ratio, carry out voltage and promote and conversion.The former need adopt micro electronmechanical manufacture to make small switch, and needs vibrational energy auxiliary; The latter then needs a depletion field effect transistor usually, and the transformer of a high transformation ratio.The utility model based on the latter's principle, and improves existing implementation method.
Summary of the invention
The utility model utilizes high transformation ratio transformer, depletion field effect transistor and capacitor, constitutes an oscillator, and extremely low DC input voitage is converted to the bigger alternating voltage of amplitude, offers rectification or the use of other circuit in the energy acquisition circuit.
The technical scheme that the utility model adopted is
:
The utility model comprises transformer, depletion field effect transistor, first capacitor and second capacitor, the former limit one termination input direct voltage of described transformer, the drain electrode of the described depletion field effect transistor of another termination, the secondary of described transformer connects output voltage, other end ground connection; It is end of the same name that former edge joint Input voltage terminal of described transformer and secondary connect output voltage terminal; The source ground of described depletion field effect transistor, the grid of described depletion field effect transistor connects output voltage; Described first capacitor series is between input voltage and ground; Described second capacitor series is between output voltage and ground.
The utlity model has following advantage:
The traditional solution that utmost point low dc voltage is converted to the higher magnitude alternating voltage be with described second capacitor series between the grid and output voltage of described depletion field effect transistor, resistance that is used for eliminating intermittent oscillation phenomenon (Squegging) of serial connection between described depletion field effect transistor and ground.In traditional solution, because the parasitic capacitance Cgs that described field effect transistor exists between grid and source electrode, connect with the secondary inductance of described transformer again after this electric capacity and the capacitances in series that is serially connected between described fet gate and output voltage, the resonant tank that forms, resonance frequency is by inductance and capacitance size decision, wherein inductance value is determined by described transformer secondary inductance, and capacitance is substantially by parasitic capacitance Cgs decision, because parasitic capacitance Cgs is much smaller than being serially connected in electric capacity between described fet gate and output voltage.Because the parasitic character of parasitic capacitance Cgs, capacitance is less, and changes greatlyyer, causes resonance frequency higher and change greatlyyer, will make in the energy Acquisition Circuit rectifier etc. be difficult to optimize aspect efficient design.
Adopt the utility model circuit structure, two advantages arranged:
(1) parasitic capacitance Cgs is in parallel with described second capacitor between described fet gate and source electrode, and back in parallel capacitance makes the resonance frequency stable and controllable of system by the capacitance decision of described second capacitor.
(2) need be between the grid of described field effect transistor and ground resistance that is used for eliminating the intermittent oscillation phenomenon of serial connection.Because the grid of described field effect transistor has DC channel between the ground, the direct voltage of grid is 0V.And not having path between grid voltage and the ground in the traditional solution, grid voltage floats.
Description of drawings
Fig. 1 is the utility model circuit theory diagrams.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
As shown in Figure 1, the utility model circuit comprises a transformer T1, a field effect transistor M1, two capacitor C1 and C2.The former limit of transformer connects input voltage respectively and connects the drain electrode of field effect transistor, and input voltage meets a capacitor C1 to ground, is used for stablizing input voltage; The secondary of transformer connects output voltage and ground respectively, and it is end of the same name that transformer that output voltage connects one end and input voltage connect an end.The grid of field effect transistor connects output voltage, and meets a capacitor C2 to ground; The source ground of field effect transistor.Input voltage is
V In, output voltage is
V Out, the former limit of transformer both end voltage is
V 1, the secondary both end voltage is
V 2
The principle of DC-AC conversion is described below: all node voltages of system all are 0 before startup, and this moment, field effect transistor M1 was owing to be depletion field effect transistor, thus be in conducting state, but the drain-source voltage of M1 is 0, does not therefore have electric current to flow through.When input voltage became a direct current voltage, because M1 is in conducting state, the former limit of transformer had electric current to flow through, and the drain voltage of M1 rises gradually, i.e. the former limit of transformer both end voltage
V 1From
V InReduce the voltage that induces at the secondary of transformer gradually
V 2Also reduce gradually,
V 2The amplification that reduces by field effect transistor the drain voltage of field effect transistor is increased, and further reduce
V 2, form positive feedback, up to
V 2Close field effect transistor when being reduced to a certain degree gradually.Closing field effect transistor causes and causes the decline of drain voltage
V 2Voltage rises, and the amplification by field effect transistor further makes the drain voltage of field effect transistor descend, and forms positive feedback, up to
V 2Open field effect transistor when reducing to increase to a certain degree gradually.Through the circulation in several cycles, the vibration of system is stable gradually.The resonance frequency of this moment is about 2 π (L2 * C2)
0.5, wherein L2 is a transformer secondary inductance value.Output voltage amplitude is about
n*
V In
When the transformation ratio of transformer is 100 times, when input voltage was 20mV, output voltage amplitude was about 2V, can be translated into required direct voltage for uses such as rectification circuit or voltage multipliers, powered to devices such as microsensors.
Claims (1)
1. utmost point low input DC-AC change-over circuit, comprise transformer, depletion field effect transistor, first capacitor and second capacitor, it is characterized in that: the former limit one termination input direct voltage of described transformer, the drain electrode of the described depletion field effect transistor of another termination, the secondary of described transformer connects output voltage, other end ground connection; It is end of the same name that former edge joint Input voltage terminal of described transformer and secondary connect output voltage terminal; The source ground of described depletion field effect transistor, the grid of described depletion field effect transistor connects output voltage; Described first capacitor series is between input voltage and ground; Described second capacitor series is between output voltage and ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200971533U CN203104328U (en) | 2013-03-04 | 2013-03-04 | DC-AC (Direct Current-Alternating Current) switching circuit with ultralow input voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200971533U CN203104328U (en) | 2013-03-04 | 2013-03-04 | DC-AC (Direct Current-Alternating Current) switching circuit with ultralow input voltage |
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| Publication Number | Publication Date |
|---|---|
| CN203104328U true CN203104328U (en) | 2013-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013200971533U Expired - Fee Related CN203104328U (en) | 2013-03-04 | 2013-03-04 | DC-AC (Direct Current-Alternating Current) switching circuit with ultralow input voltage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103107727A (en) * | 2013-03-04 | 2013-05-15 | 杭州电子科技大学 | Extremely-low-input-voltage direct-current (DC)-to-alternating-current (AC) converting circuit used for collection of little energy |
-
2013
- 2013-03-04 CN CN2013200971533U patent/CN203104328U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103107727A (en) * | 2013-03-04 | 2013-05-15 | 杭州电子科技大学 | Extremely-low-input-voltage direct-current (DC)-to-alternating-current (AC) converting circuit used for collection of little energy |
| CN103107727B (en) * | 2013-03-04 | 2015-11-18 | 杭州电子科技大学 | For the pole low input DC-AC change-over circuit that de minimis energy gathers |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130731 Termination date: 20150304 |
|
| EXPY | Termination of patent right or utility model |