CN102447454A - Light-dependent control duty ratio disconnecting switch - Google Patents
Light-dependent control duty ratio disconnecting switch Download PDFInfo
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- CN102447454A CN102447454A CN2010105070233A CN201010507023A CN102447454A CN 102447454 A CN102447454 A CN 102447454A CN 2010105070233 A CN2010105070233 A CN 2010105070233A CN 201010507023 A CN201010507023 A CN 201010507023A CN 102447454 A CN102447454 A CN 102447454A
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Abstract
The invention relates to a light-dependent control duty ratio disconnecting switch for an electromagnetic resonance receiving end. The disconnecting switch consists of four parts of a low resistivity electronic switch 1, a pressure control pulse width oscillator 2, a light-dependent control voltage regulator 3 and a group of power supplies 4, wherein the low resistivity electronic switch is controlled by the pressure control pulse width oscillator, the pressure control oscillator is controlled by the light-dependent control voltage regulator, and the power supplies supply the working voltage and the working current for the pressure control oscillator and the light-dependent control voltage regulator. The output duty ratio of the electronic switch is regulated through the brightness of an isolated luminotron, so that the on-off time of the electronic switch is controlled, and the purpose of regulating the output current or voltage is realized. The electronic switch can keep the load voltage and the no-load voltage of the receiving circuit consistent, circuit components are prevented from being burnt due to overvoltage under the condition of no-load, the heating phenomenon when the receiving circuit is unloaded can also be prevented, meanwhile, the emission current of a transmission circuit which supplies power to the receiving circuit can also be reduced, and the energy-saving purpose is benefited.
Description
Technical field
The present invention relates to a kind of electronic switch, a kind of isolating switch that is used for the light-operated duty ratio of electromagentic resonance receiving terminal.
Background technology
Big function electric energy transmitting in electromagentic resonance can be realized closely through the magnetic coupling makes the wireless power of electrical equipment become possibility.The device of realizing this electric energy transmitting is two LC resonant tanks that operating frequency is identical; Be respectively emission LC resonant tank and reception LC resonant tank; Wherein launch the LC resonant tank and be controlled by the emission driver, electric current is exported to the electrical appliance use and receive the LC resonant tank.In the practical application; There is a special phenomena to be: the output voltage of LC resonance receiving loop output; Change a lot along with the difference of load, floating voltage and load voltage often differ several times even more than ten times, cause the badly damaged of electrical equipment or circuit element; Simultaneously LC resonance receiving loop is in resonance condition, and the energy of reception is because not output, can only consumable, be used for heating, and even more serious is, at this moment the emission current of radiating circuit continues with big electric current in work, has more increased to waste heating.
How just can accomplish to let reception LC resonance receiving circuit have a metastable output voltage and minimizing to waste?
Summary of the invention
The present invention is a kind of isolating switch that is used for the light-operated duty ratio of electromagentic resonance receiving terminal, and it has two butt joint line ends, and a pair of is switch terminals; Another is to being control end, and it is made up of four parts: a low-resistance electronic switch, a voltage-controlled pulsewidth oscillator; A light-operated voltage regulator and one group of internal electric source; Its medium or low resistance electronic switch is to be formed by two electrode differential concatenations in leakage-source that two FET manage, and two drain electrodes are as switch terminals, and two source electrodes are common ground; The public canopy utmost point of two FET pipes links to each other with the output of voltage-controlled pulsewidth oscillator; The input of voltage controlled oscillator links to each other with the output of light-operated voltage regulator, and the input of light-operated voltage regulator is a light-emitting diode, and power supply is that voltage controlled oscillator and light-operated voltage regulator provide operating voltage and electric current; Its operation principle is: through changing the output voltage height of luminous tube brightness change voltage regulator, further change the duty ratio of the square wave of voltage controlled oscillator, further change the conducting duty ratio of electronic switch; Because the luminous tube in the optocoupler is isolated, so just obtained the isolating switch of a light-operated duty ratio.
The isolating switch of light-operated duty ratio is a power device, and its maximum characteristic is: the duty ratio of coming by-pass cock through light.
The low-resistance electronic switch is the bidirectional electronic switch of a milliohm level resistance, and the differential concatenation that can be managed by the CMOS FET of two low-resistances forms, i.e. source electrode (the S utmost point) serial connection of two FET pipes; The drain electrode (the D utmost point) of two FET pipe is as the two ends of switch, grid (the G utmost point) parallel connections of two FET pipes simultaneously, and this is the control end of low-resistance electronic switch; If add a control voltage (high level) at the altogether public G utmost point and S on extremely, two FET conductings simultaneously are low resistive state between the D utmost point that promptly two FET manage; The electronic switch conducting; Otherwise two FET pipes end simultaneously, promptly are high-impedance state between the D utmost point of two FET, and electronic switch ends.
The public G utmost point of FET pipe links to each other with the output of voltage-controlled pulsewidth oscillator.
Voltage-controlled pulsewidth oscillator is a square-wave oscillator, and the duty ratio of square wave is by the voltage decision of control end, and voltage is high more, and duty ratio is big more, otherwise more little.
The control end of voltage-controlled pulsewidth oscillator links to each other with the output of light-operated voltage regulator.
Light-operated voltage regulator mainly is made up of an optocoupler and a triode, and it is the voltage follower of a linearity, is controlled by the luminous tube in the optocoupler, and luminous tube is bright more, and output end voltage is low more, otherwise high more.The power supply of this voltage regulator is provided by power circuit.
Like this, following chain lock relation is just arranged: the make-and-break time of the duty ratio → electronic switch of the square wave of the output voltage height → voltage controlled oscillator of luminous tube brightness size → voltage regulator, the i.e. make-and-break time of the brightness decision electronic switch of luminous tube.
The isolating switch of light-operated duty ratio has an internal electric source, for voltage regulator and voltage controlled oscillator provide operating current and voltage, this power supply be two ends from switch through shunting capacitance after rectifying and wave-filtering obtain.
The isolating switch of light-operated duty ratio is an independently electronic device, and it has two butt joint line ends, and a pair of is switch terminals, opens and two ends link to each other with the drain electrode of two FET pipe respectively, and another is to being control end, respectively with optocoupler in luminous tube link to each other; Because the luminous tube in the optocoupler is isolated, so just obtained the isolating switch of a light-operated duty ratio.
The isolating switch of light-operated duty ratio is an output duty cycle of regulating electronic switch through the brightness of the luminous tube of isolating, with the make-and-break time of control electronic switch, reaches the purpose of regulating output current or voltage.The effect of this electronic switch in the reception of electromagentic resonance is vital; The load voltage that it not only can keep receiving circuit is consistent with floating voltage; Circuit element is burnt in overvoltage when preventing zero load, in the time of can also preventing to accept the circuit zero load, because of excessively receiving the heating phenomenon that causes; Can also reduce simultaneously the emission current of the radiating circuit of power supply with it, for energy-conservation be useful.
Description of drawings
Accompanying drawing 1 is the circuit theory diagrams of the isolating switch of light-operated duty ratio.
Accompanying drawing 2 is pin sketch mapes of the isolating switch module of light-operated duty ratio.
Accompanying drawing 3 is one of application principle figure of the isolating switch of light-operated duty ratio.
Accompanying drawing 4 be light-operated duty ratio isolating switch application principle figure two.
In the accompanying drawing 1, empty frame 1 is the low-resistance electronic switch, and empty frame 2 is voltage-controlled square-wave oscillator, and empty frame 3 is light-operated voltage regulator, and empty frame 4 is a power circuit.T1, T2 are two CMOS FET pipes, and VO is voltage-controlled square-wave oscillator, and Q1 is a triode, and TP is an optocoupler, and DW is a voltage-stabiliser tube, and BG1 is a full bridge rectifier, and C3 is a filter capacitor, and C1 and C2 are shunting capacitance, and R1, R2, R3, R4 and R5 are resistance.A, B, C and D are four electrodes, and A, B are two outputs of switch, and C, D are control end.
In the low-resistance electronic switch 1, T1 and T2 are two low-resistance CMOS FET pipes, and resistance value is generally the milliohm level, and two source electrodes (the S utmost point) series connection of T1 and T2 is as common ground; Two drain electrodes (the D utmost point) are as two outputs of switch, and two grids (the G utmost point) parallel connection is as public control end, like this; As long as at the common port of T1 and T2, promptly the S utmost point and G add a high level on extremely, and T1 and T2 will the while conductings; Be low resistance between two D utmost points, the electronic switch conducting, otherwise; T1 and T2 end, and are high resistance between two D utmost points, and electronic switch cuts out.
The high level of control low-resistance electronic switch 1 is from voltage-controlled square-wave oscillator 2; Voltage-controlled square-wave oscillator is a square-wave generator, and the O end is output, the square-wave signal of an EDM Generator of Adjustable Duty Ratio of output; Vp is a voltage controling end, changes the duty ratio that this voltage just can change the output square wave.
Control voltage Vp is by light-operated voltage regulator 3 decisions, and the luminous tube in optocoupler TP is bright more, and the bias voltage of triode Q1 is high more, and then Vp is just low more, otherwise then high more.So following relation is just arranged: the luminous tube in optocoupler TP is bright more, and the bias voltage of triode Q1 is high more, and then Vp is just low more, and the duty ratio of the output square wave of voltage-controlled square-wave oscillator 2 is more little, and the ON time of low-resistance electronic switch 1 is short more; Luminous tube in optocoupler TP is dark more, and the bias voltage of triode Q1 is low more, and then Vp is just high more, and the duty ratio of the output square wave of voltage-controlled square-wave oscillator 2 is big more, and the ON time of low-resistance electronic switch 1 is long more.
Low-resistance electronic switch 1, voltage-controlled square-wave oscillator 2 and light-operated voltage regulator 3 needed operating voltages are provided by power circuit 4; The alternating current at A and B two ends is after C1, C2 shunting; After full-bridge rectification pipe BG1 rectification, after C3 filtering and DW voltage stabilizing, the voltage of a quite stable is provided.Because two FET pipes are when conducting; A and B two ends are in short-circuit condition; At this moment power circuit does not have energy supplement, and therefore, the maximum duty cycle of the isolating switch of light-operated duty ratio just can not be 100%; For guaranteeing the energy supplement of power circuit, the duty cycle range of the isolating switch of common light-operated duty ratio is between the 0-95%.
The resistance of the isolating switch of this light-operated duty ratio when conducting is the milliohm level, and therefore, in real work, its caloric value is very little.
Accompanying drawing 2 is that the isolating switch of whole light-operated duty ratio is used as a module (or IC), and A, B, the sharp D of C are two pairs of electrodes, and wherein A, B are switch terminals, and C, D are control end, are the two ends of LED.Form the volume that module can reduce application circuit greatly, improve the stability of circuit, reduce use cost.
In the accompanying drawing 3, VK is the isolating switch of light-operated duty ratio, and L is the resonance receiving coil, and C is that resonance receives electric capacity, and BG2 is a full-bridge, and C6 is a filter capacitor, and DW2 is a voltage-stabiliser tube, R6 resistance.
In the accompanying drawing 4, VK is the isolating switch of light-operated duty ratio, and L is the resonance receiving coil, and C is that resonance receives electric capacity, and D1, D2 are rectifying tube, and C6 is a filter capacitor, and DW2 is a voltage-stabiliser tube, R6 resistance.
Embodiment
Below in conjunction with instance, further specify the function and the method for using of the isolating switch of light-operated duty ratio.
One of the isolating switch of instance one, light-operated duty ratio application in the receiving circuit of electromagentic resonance.
In the accompanying drawing 3, resonant capacitance C is with after the output terminals A of the isolating switch VK of light-operated duty ratio is connected, and another output B is parallelly connected with resonance coil L, and the alternating current at L two ends is exported after rectifier bridge BG2 and C6 filtering; Vo representes output voltage, and this voltage is the LED power supply among the VK after the DW2 step-down, because DW2 is a voltage-stabiliser tube, two ends have fixing voltage drop; Therefore, the variation of Vo has just directly influenced the voltage at LED two ends, promptly has influence on the brightness of LED; When the Vo rising, LED brightness increases, and the output duty cycle of VK reduces; The operating time of resonant capacitance C reduces, and the output voltage at resonance coil L two ends reduces, and forces Vo to descend; Otherwise when Vo decline, LED brightness reduces, and the output duty cycle of VK strengthens, the operating time lengthening of resonant capacitance C, and the output voltage at resonance coil L two ends increases, and forces Vo to rise, and Vo just maintains certain value like this, has realized the purpose that voltage stabilizing is exported.
Here, the main effect of the isolating switch VK of light-operated duty ratio has three: 1, regulates operating time of resonant capacitance, makes output voltage stabilization; 2, when output was unloaded, the output duty cycle of VK was 0, and circuit no longer is in resonance condition, and receiving ability descends greatly, has not only protected circuit element, and has reduced hear rate; 3, because receiving terminal resonance no longer, therefore the emission current that is in the transmitting terminal of resonance state can descend significantly, helps energy-conservation.
Two of the application of the isolating switch of instance two, light-operated duty ratio in the receiving circuit of electromagentic resonance.
In the accompanying drawing 4, the switch terminals of the isolating switch VK of light-operated duty ratio is still connected with resonant capacitance C, and different is; Resonance coil is not one by one, but two L1 and L2 series connection, centre cap is as ground wire; In addition, rectifying tube is not a full-bridge, but the half-bridge of forming by D1 and D2; Its operation principle and effect are identical with accompanying drawing 3, no longer repeat.
Claims (6)
1. isolating switch that is used for the light-operated duty ratio of electromagentic resonance receiving terminal; It has two butt joint line ends, and a pair of is switch terminals, and another is to being control end; It is made up of four parts: a low-resistance electronic switch; A voltage-controlled pulsewidth oscillator, a light-operated voltage regulator and one group of internal electric source, its medium or low resistance electronic switch is formed by two FET pipe differential concatenations; The public canopy utmost point of two FET pipes links to each other with the output of voltage-controlled pulsewidth oscillator; The input of voltage controlled oscillator links to each other with the output of light-operated voltage regulator, and the input of light-operated voltage regulator is a light-emitting diode, and internal electric source is that voltage controlled oscillator and light-operated voltage regulator provide operating voltage and electric current; Its operation principle is: through changing the output voltage height of luminous tube brightness change voltage regulator, further change the duty ratio of the square wave of voltage controlled oscillator, further change the conducting duty ratio of electronic switch; Because the luminous tube in the optocoupler is isolated, so just obtained the isolating switch of a light-operated duty ratio.
2. the isolating switch of light-operated duty ratio according to claim 1, it is characterized in that: the low-resistance electronic switch is the bidirectional electronic switch of a milliohm level resistance, can be formed by the differential concatenation of the CMOS FET pipe of two low-resistances; Promptly source electrode (the S utmost point) serial connection of two FET pipe is as common ground, and the drain electrode (the D utmost point) of two FET pipes is as the two ends of switch, grid (the G utmost point) parallel connections of two FET pipes simultaneously; This is the control end of low-resistance electronic switch; If add a control voltage (high level) at the altogether public G utmost point and S on extremely, two FET conductings simultaneously are low resistive state between the D utmost point that promptly two FET manage; The electronic switch conducting; Otherwise two FET pipes end simultaneously, promptly are high-impedance state between the D utmost point of two FET, and electronic switch ends.
3. the isolating switch of light-operated duty ratio according to claim 1, it is characterized in that: voltage-controlled pulsewidth oscillator is a square-wave oscillator, and the duty ratio of square wave is by the voltage decision of control end, and voltage is high more, and duty ratio is big more, otherwise more little.
4. the isolating switch of light-operated duty ratio according to claim 1, it is characterized in that: light-operated voltage regulator mainly is made up of an optocoupler and a triode, and it is the voltage follower of a linearity; Be controlled by the luminous tube in the optocoupler; Luminous tube is bright more, and output end voltage is low more, otherwise high more; The two ends of luminous tube are exactly the control end of the isolating switch of light-operated pulsewidth.
5. the isolating switch of light-operated duty ratio according to claim 1 is characterized in that: internal electric source obtains through electric capacity shunting back rectifying and wave-filtering from switch ends, is one group of built-in power.
6. the isolating switch of light-operated duty ratio according to claim 1; It is characterized in that: the isolating switch of whole light-operated duty ratio can be used as a module (or IC) with two pairs of electrodes; Wherein pair of electrodes is a switch terminals; Drain electrode with two FET pipes links to each other respectively, and pair of electrodes is a control end in addition, links to each other with the two ends of LED respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105070233A CN102447454A (en) | 2010-10-08 | 2010-10-08 | Light-dependent control duty ratio disconnecting switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105070233A CN102447454A (en) | 2010-10-08 | 2010-10-08 | Light-dependent control duty ratio disconnecting switch |
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| Publication Number | Publication Date |
|---|---|
| CN102447454A true CN102447454A (en) | 2012-05-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105070233A Pending CN102447454A (en) | 2010-10-08 | 2010-10-08 | Light-dependent control duty ratio disconnecting switch |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6466080B2 (en) * | 2000-10-10 | 2002-10-15 | Fujitsu Limited | Constant current driver circuit |
| US6937485B2 (en) * | 2002-08-29 | 2005-08-30 | Elpida Memory, Inc. | Duty ratio detecting apparatus with small return time |
| JP2006060324A (en) * | 2004-08-17 | 2006-03-02 | Denso Corp | Interface circuit |
| CN201118536Y (en) * | 2007-11-29 | 2008-09-17 | 李建文 | Two-line micro-power consumption electronic switch |
| CN201854252U (en) * | 2010-09-27 | 2011-06-01 | 朱斯忠 | Isolating switch with light-operated duty ratio |
-
2010
- 2010-10-08 CN CN2010105070233A patent/CN102447454A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6466080B2 (en) * | 2000-10-10 | 2002-10-15 | Fujitsu Limited | Constant current driver circuit |
| US6937485B2 (en) * | 2002-08-29 | 2005-08-30 | Elpida Memory, Inc. | Duty ratio detecting apparatus with small return time |
| JP2006060324A (en) * | 2004-08-17 | 2006-03-02 | Denso Corp | Interface circuit |
| CN201118536Y (en) * | 2007-11-29 | 2008-09-17 | 李建文 | Two-line micro-power consumption electronic switch |
| CN201854252U (en) * | 2010-09-27 | 2011-06-01 | 朱斯忠 | Isolating switch with light-operated duty ratio |
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Application publication date: 20120509 |