CN201349355Y - Control circuit of zero-voltage switch resonance inverter - Google Patents
Control circuit of zero-voltage switch resonance inverter Download PDFInfo
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- CN201349355Y CN201349355Y CNU2009200017473U CN200920001747U CN201349355Y CN 201349355 Y CN201349355 Y CN 201349355Y CN U2009200017473 U CNU2009200017473 U CN U2009200017473U CN 200920001747 U CN200920001747 U CN 200920001747U CN 201349355 Y CN201349355 Y CN 201349355Y
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Abstract
The utility model discloses a control circuit of a zero-voltage switch resonance inverter, comprising a timing circuit; an oscillator coupled with the timing circuit; a logic control circuit coupled with the oscillator and a switch circuit; a current sensor coupled with the switch circuit and sensing the current between the switch circuit and the transformer or the input or output resonance current of the resonance circuit; a full wave rectifier coupled with the current sensor and a resetting circuit. The control circuit detects the current between the switch circuit in the zero-voltage switch resonance inverter and one side of the transformer or the input, output resonance current of the resonant circuit to distinguish the time when the current reaches the zero, in order to adjust the time sequence of the ramp voltage, thus the zero voltage switch feature of the power switch at conduction state is ensured and the switch current when the power switch is turned off, is reduced and furthermore the switch loss of the power switch is reduced and at the same time the duty ratio loss of the control circuit is reduced.
Description
Technical field
The utility model relates to a kind of control circuit of resonance inverter, and is particularly related to a kind of control circuit of zero voltage switching resonance inverter.
Background technology
The large scale liquid crystal display is because of cost of manufacture and power supply conversion efficiency requirement, and its cold cathode fluorescent lamp inverter adopts the LIPS framework more, and LIPS is the abbreviation of LCD Integrated Power Supply.The LIPS framework is directly given cold cathode fluorescent lamp inverter by the DC-voltage supply of power factor correction circuit output representative value 400V high pressure.Under this high pressure input condition, make the power switch of inverter possess zero voltage switching and/or zero current switching characteristic, can effectively reduce the switch cost of switch.Inverter adopts resonance manner to produce resonance potential usually and electric current switches required no-voltage and/or zero current so that switch to be provided, and this inverter is called resonance inverter.Fig. 1 is a kind of circuit diagram of cold cathode fluorescent lamp inverter of existing employing LIPS framework, this cold cathode fluorescent lamp inverter is a kind of resonance inverter (being designated hereinafter simply as the zero voltage switching resonance inverter) that possesses the zero voltage switching characteristic, and Fig. 2 is the signal waveforms of the switching circuit of cold cathode fluorescent lamp inverter shown in Figure 1.Please be simultaneously with reference to Fig. 1 and Fig. 2, it is the direct voltage Vdc of 400V high pressure that cold cathode fluorescent lamp inverter 1 receives representative value, and with its alternating voltage Vac that changes into the string waveshape to drive cold-cathode fluorescence lamp 2.
Cold cathode fluorescent lamp inverter 1 comprises switching circuit 11, transformer 12 and resonant circuit.In this example, switching circuit 11 adopts semibridge system switching circuit framework, it comprises two power switchs of being realized by N channel mos field-effect transistor 111 and 112, between switch ends, there are interelectrode capacitance device 113 and 114 and body diode (body diode) 115 and 116, wherein body diode 115 and 116 and switch 111 and 112 anti-and connect so that electric current I ds1 and Ids2 reverse circulated path to be provided.Transformer 12 comprises the coil 121 of primary side, the coil 122 and the electric leakage sensor 123 of secondary side.Resonant circuit adopts series resonance shunt load framework, and it comprises electric leakage sensor 123 and capacitor 131 coupled in series between second siding ring 122 two ends of transformer 12, and capacitor 131 and cold-cathode fluorescence lamp 2 coupled in parallel as load.
Control signal Vg1 and Vg2 form gate-source voltage Vgs1 and Vgs2 on two power switchs 111 and 112, and then control two power switchs 111 and 112 alternately conductings, the direct voltage Vdc of input is cut into the alternating voltage Vp1 of square wave form, and wherein the frequency of the frequency of control signal Vg1 and Vg2 (or switching frequency) fs decision alternating voltage Vp1 is fs.Alternating voltage Vp1 then boosts through transformer 12 and resonant circuit carries out becoming the alternating voltage Vac of string waveshape and driving cold-cathode fluorescence lamp 2 behind the resonance.Because the resonance frequency fr of the capacitance decision resonant circuit of the inductance value of electric leakage sensor 123 and capacitor 131, and resonant circuit presents capacitive character or inductive according to the frequency (being switching frequency fs in this example) of received signal with the relation of resonance frequency fr, therefore, design switching frequency fs is less than resonance frequency fr, make and adopt the resonant circuit of series resonance shunt load framework to be inductive, and then cause alternating current Ip2 to fall behind alternating voltage Vac one phase angle difference ψ, and being transformer 12 secondary sides, alternating current Ip1 shines upon back the string ripple electric current of primary side, the old friend flows electric current I p1 and also falls behind alternating voltage Vp1 one phase angle difference ψ, and this phase angle difference ψ makes power switch 111 and 112 possess the principal element of zero voltage switching characteristic.
When control signal Vg1 at high level and during control switch 111 conductings, switch 111 two ends cross-pressure Vds1 are zero, alternating voltage Vp1 is Vdc/2, alternating current Ip1 is switch 111 electric current I ds1.When control signal Vg1 becomes low level and the moment of control switch 111 disconnections at time point t1, because electric current must be continuous, switch 111 electric current I ds1 can the moment vanishing, alternating current Ip1 comprises switch 111 electric current I ds1 and switch 112 electric currents (Ids2), therefore alternating current Ip1 can with interelectrode capacitance device 113 and 114 resonance, make that the switch 111 two ends cross-pressure Vds1 of conducting linearly rise, the linear decline of switch 112 two ends cross-pressure Vds2 of pre-conducting.When switch 112 two ends cross-pressure Vds2 when time point t2 crosses over zero point, and body diode 116 conductings that connect anti-with switch 112, this moment, switch 112 wait control signal Vg2 became high level (as at time point t3) and zero voltage switching is promptly reached in conducting.Similarly, switch 111 two ends cross-pressure Vds1 are after time point t4 crosses over zero point, and switch 111 wait control signal Vg1 become high level (as at time point t5) and zero voltage switching is promptly reached in conducting.The switch cost of switch is Pd=Vds * Ids * fs, and switch 111 and 112 is because be all zero at conducting moment two ends cross-pressure Vds1 and Vds2, make switch 111 and 112 switch costs in conducting moment be all Pd=0V * (Ids) * fs=0W, can reduce switch and switch the switch cost that is produced because of high frequency so switch possesses the zero voltage switching characteristic.
As shown in the above description, when the load end circuit of transformer 12 secondary sides is inductive, the electric current I p1 of transformer 12 primary sides falls behind voltage Vp1, makes the power switch 111 and 112 of primary side obtain the zero voltage switching characteristics, and the switch cost that is produced in switch 111 and 112 conducting moments is zero.But,, make switch 111 and 112 when disconnecting, have switch cost also because electric current I p1 falls behind voltage Vp1; For example, with switch 111 is example, and when switch 111 ended at time point t1, electric current I ds1 still can continue to flow through switch 111, till time point t2 rose to direct voltage Vdc, so there was switch cost in switch 111 at time point t1 when t2 disconnects up to switch 111 two ends cross-pressure Vds1.Moreover, also, make the control circuit (not illustrating among the figure) of switch 111 and 112 conductings or disconnection have duty-cycle loss because electric current I p1 falls behind voltage Vp1; For example, with switch 112 is example, switch 112 is when time point t3 conducting, primary side voltage Vp1 becomes-Vdc/2, ought to transmit the cycle this moment for the negative half period energy, but primary side current Ip1 still is in positive half cycle, must wait for that primary side current Ip1 crosses over zero point to negative half period by positive half cycle, energy could be by the real load end circuit that is sent to secondary side, so electric current I p1 begins by just changeing the duty-cycle loss that negative interval is exactly a control circuit at time point t3.Duty-cycle loss is big more, and control circuit control switch 111 and 112 energy-delivering abilities are just poor more, even the energy shortage that may cause transmission is to drive cold-cathode fluorescence lamp 2.
Summary of the invention
The purpose of this utility model is exactly to propose a kind of control circuit of zero voltage switching resonance inverter, the cpable of lowering power switch when disconnecting switch cost and the duty-cycle loss of control circuit.
In order to reach above-mentioned purpose and other purpose, the utility model proposes a kind of control circuit of zero voltage switching resonance inverter, wherein the zero voltage switching resonance inverter comprises switching circuit, transformer and resonant circuit, switching circuit is coupled to transformer, transformer is coupled to resonant circuit, resonant circuit is coupled to load, switching circuit changes into alternating voltage according to control signal with the direct voltage of importing, and alternating voltage boosts through transformer and resonant circuit carries out becoming the alternating voltage of string waveshape to drive load behind the resonance.The control circuit of zero voltage switching resonance inverter comprises timing circuit, oscillator, logic control circuit, current sensor, full-wave rectifier and reset circuit.Oscillator is coupled to timing circuit, and timing circuit is discharged and recharged to produce ramp voltage.Logic control circuit is coupled to oscillator and switching circuit, produces control signal according to ramp voltage.Current sensor couples inputing or outputing resonance current and it is changed into voltage signal with electric current between sense switch circuit and the transformer or resonant circuit.Full-wave rectifier is coupled to current sensor, and voltage signal is carried out full-wave rectification, to produce the full-wave rectified voltage signal.Reset circuit is coupled to full-wave rectifier and timing circuit, by comparing full-wave rectified voltage signal and voltage setting value, be failure to actuate during at the full-wave rectified voltage signal greater than voltage setting value, and at the full-wave rectified voltage signal timing circuit that resets during less than voltage setting value.
The beneficial effects of the utility model are: the electric current in the control circuit employing detecting zero voltage switching resonance inverter of zero voltage switching resonance inverter of the present utility model between switching circuit and the transformer primary side or input, the export resonance electric current of resonant circuit, differentiate electric current near time at zero point so that adjust the sequential of ramp voltage, can keep the zero voltage switching characteristic of power switch when conducting, also can reduce its switching current when disconnecting and then the switch cost of reduction power switch, also eliminate the duty-cycle loss of control circuit simultaneously.
Description of drawings
Fig. 1 is a kind of cold cathode fluorescent lamp inverter circuit diagram of existing employing LIPS framework;
Fig. 2 is the signal waveforms of the switching circuit of cold cathode fluorescent lamp inverter shown in Figure 1;
Fig. 3 is the circuit diagram according to the control circuit of the zero voltage switching resonance inverter of the utility model one embodiment;
Fig. 4 is the signal waveforms of zero voltage switching resonance inverter shown in Figure 3 and control circuit.
Description of reference numerals: 1: cold cathode fluorescent lamp inverter; 11: switching circuit; 111,112: power switch; 113,114: the interelectrode capacitance device; 115,116: body diode; 12: transformer; 121: first siding ring; 122: second siding ring; 123: the electric leakage sensor; 131: capacitor; 2: cold-cathode fluorescence lamp; 3: control circuit; 31: integrated circuit; 311: error amplifier; 312: the pulse-width modulation comparator; 313: oscillator; 314: logic control circuit; 315: output driving circuit; 32: commutation circuit; 321,322: single-pole double-throw switch (SPDT); 33: timing circuit; 331: the first time capacitors; 332: the first timing resistor devices; 333: the second time capacitors; 334: the second timing resistor devices; 34: reset circuit; 341: comparator; 342: switch; 35: the current peak transducer; 36: current sensor; 37: full-wave rectifier; Ids1, Ids2: switching current; I1, I2: switching current value; Ip1: transformer primary side current; Ip2: Circuit Fault on Secondary Transformer electric current; Ilamp: lamp current; Vdc: direct voltage; Vac: exchange the string wave voltage; Vg1, Vg2: control signal; Vgs1, Vgs2: gate-source voltage; Vds1, Vds2: switch ends cross-pressure; Vf: feedback voltage; Vref: reference voltage; Vea, Vea ': error voltage; Vst, Vst ': ramp voltage; Vpwm: pulse-width signal; Vi: voltage signal; Vrec: full-wave rectified voltage signal; Vth: voltage setting value; Vp1, Vp1 ': transformer primary side voltage; Fs: switching frequency; Fst: start frequency; Fop: operating frequency; T1～t5: time point; Td: ON time; ψ: phase angle difference.
Embodiment
Below in conjunction with accompanying drawing, be described in more detail with other technical characterictic and advantage the utility model is above-mentioned.
Fig. 3 is the circuit diagram according to the control circuit of the zero voltage switching resonance inverter of the utility model one embodiment, the zero voltage switching resonance inverter for example is a cold cathode fluorescent lamp inverter 1 shown in Figure 1, but not as limit, and Fig. 4 is the signal waveforms of zero voltage switching resonance inverter shown in Figure 3 and control circuit thereof.Please be simultaneously referring to figs. 1 through Fig. 4, the control circuit 3 of zero voltage switching resonance inverter 1 comprises error amplifier 311, pulse-width modulation comparator 312, oscillator 313, logic control circuit 314, output driving circuit 315, commutation circuit 32, timing circuit 33, reset circuit 34, current peak transducer 35, current sensor 36 and full-wave rectifier 37.
Because cold-cathode fluorescence lamp 2 is (or before starting successfully) when starting, lamp current Ilamp is zero or is lower than certain value, the feedback voltage V f of current peak transducer 35 outputs is zero or is lower than certain value, control circuit 3 can utilize commutation circuit 32 to judge the startup success or not according to feedback voltage V f, switching to second timing circuit when starting serves as the ramp voltage Vst that starts frequency f st to provide oscillator 313 to produce frequencies, and to switch to first timing circuit after starting successfully be the ramp voltage Vst of operating frequency fop so that oscillator 313 generation frequencies to be provided.Therefore, timing circuit 33 comprises first timing circuit and second timing circuit.First timing circuit comprises first time capacitor 331 and the first timing resistor device 332, is that C1 and the first timing resistor device, 332 resistance values are R1 as if first time capacitor, 331 capacitances, then operating frequency fop and 1/ (R1 * C1) proportional.Second timing circuit comprises second time capacitor 333 and the second timing resistor device 334, if second time capacitor, 333 capacitances are that C2 and the second timing resistor device, 334 resistance values are R2, then start frequency f st and 1/ (R2 * C2) proportional, wherein R1 * C1＞R2 * C2.In addition, commutation circuit 32 is coupled to oscillator 313, timing circuit 33 and current peak transducer 35, and in this example, commutation circuit 32 is a double-point double-throw switch, promptly comprises two single-pole double-throw switch (SPDT)s 321 and 322.
As shown in Figure 4, in Vp1 and Ip1 oscillogram, power switch is I1 in disconnection its switching current size of moment, and in Vp1 ' and Ip1 oscillogram, power switch is I2 in disconnection its switching current size of moment; Significantly, current value I 1 is greater than I2.So the utility model resets at the very start after cold-cathode fluorescence lamp 2 starts successfully by reset circuit 34 and adjusts the sequential of ramp voltage, reduces the switching current size of power switch when disconnecting, and then reduces the switch cost of power switch; Simultaneously, also eliminate the duty-cycle loss of control circuit 3.And, because power switch of the present utility model is I2 in disconnection its switching current size of moment, still can carry out resonance with the interelectrode capacitance device of power switch, make the linear rising of the power switch two ends cross-pressure that is compelled to disconnect, descend and the power switch two ends cross-pressure of pre-conducting is linear, when the power switch two ends of pre-conducting cross-pressure is zero, order the power switch conducting of pre-conducting, so power switch still has the zero voltage switching characteristic.
In sum, the electric current in the control circuit employing detecting zero voltage switching resonance inverter of zero voltage switching resonance inverter of the present utility model between switching circuit and the transformer primary side or input, the export resonance electric current of resonant circuit, differentiate electric current near time at zero point so that adjust the sequential of ramp voltage, can keep the zero voltage switching characteristic of power switch when conducting, also can reduce its switching current when disconnecting and then the switch cost of reduction power switch, also eliminate the duty-cycle loss of control circuit simultaneously.
More than explanation is just illustrative for the utility model; and it is nonrestrictive; those of ordinary skills understand; under the situation of the spirit and scope that do not break away from following claims and limited; can make many modifications; change, or equivalence, but all will fall in the protection range of the present utility model.
Claims (8)
1. the control circuit of a zero voltage switching resonance inverter, described zero voltage switching resonance inverter comprises a switching circuit, one transformer and a resonant circuit, described switching circuit is coupled to described transformer, described transformer is coupled to described resonant circuit, described resonant circuit is coupled to a load, the direct current voltage that described switching circuit will be imported according to a control signal changes into an alternating voltage, described alternating voltage boosts through described transformer and described resonant circuit carries out becoming the alternating voltage of a string waveshape to drive described load behind the resonance, it is characterized in that the control circuit of described zero voltage switching resonance inverter comprises:
One timing circuit;
One oscillator is coupled to described timing circuit, and described timing circuit is discharged and recharged to produce a ramp voltage;
One logic control circuit is coupled to described oscillator and described switching circuit, produces described control signal according to described ramp voltage;
One current sensor couples the resonance current that inputs or outputs with electric current between described switching circuit of sensing and the described transformer or described resonant circuit, and it is changed into a voltage signal;
One full-wave rectifier is coupled to described current sensor, and described voltage signal is carried out full-wave rectification, to produce a full-wave rectified voltage signal; And
One reset circuit, be coupled to described full-wave rectifier and described timing circuit, by a more described full-wave rectified voltage signal and a voltage setting value, be failure to actuate during at described full-wave rectified voltage signal more than or equal to described voltage setting value, and at the described full-wave rectified voltage signal described timing circuit that resets during less than described voltage setting value.
2. the control circuit of zero voltage switching resonance inverter according to claim 1 is characterized in that, more comprises:
One error amplifier receives a feedback voltage and a reference voltage, exports an error voltage by more described feedback voltage and described reference voltage, and wherein said feedback voltage is in proportion with the electric current that flows through described load; And
One pulse-width modulation comparator, be coupled to described error amplifier, described oscillator and described logic control circuit, export a pulse-width signal by more described error voltage and described ramp voltage, described logic control circuit produces described control signal according to described pulse-width signal.
3. the control circuit of zero voltage switching resonance inverter according to claim 1 is characterized in that, more comprises:
One output driving circuit is coupled to described logic control circuit and described switching circuit, in order to strengthen the driving force of described control signal.
4. the control circuit of zero voltage switching resonance inverter according to claim 1 is characterized in that, described timing circuit comprises:
One first timing resistor device has one first end and one second end, and the described first timing resistor device, first end is coupled to described oscillator, and the described first timing resistor device, second end is coupled to an earth terminal; And
One first time capacitor has one first end and one second end, and described first time capacitor, first end is coupled to described oscillator, and described first time capacitor, second end is coupled to described earth terminal.
5. the control circuit of zero voltage switching resonance inverter according to claim 4 is characterized in that, described reset circuit comprises:
One switch has one first end, one second end and a control end, and described switch first end is coupled to described first time capacitor, first end, and described switch second end is coupled to described earth terminal; And
One comparator, be coupled to described full-wave rectifier and described switch, output signal to described switch control end by more described full-wave rectified voltage signal and described voltage setting value, control described switch during more than or equal to described voltage setting value at described full-wave rectified voltage signal and disconnect, and control described switch conduction during less than described voltage setting value at described full-wave rectified voltage signal.
6. the control circuit of zero voltage switching resonance inverter according to claim 1 is characterized in that, described switching circuit comprises a full-bridge type switching circuit, semibridge system switching circuit or push-pull type switching circuit.
7. the control circuit of zero voltage switching resonance inverter according to claim 1 is characterized in that, described load comprises at least one cold-cathode fluorescence lamp.
8. the control circuit of zero voltage switching resonance inverter according to claim 7 is characterized in that, more comprises:
One switches circuit, be coupled to described oscillator and described timing circuit, wherein said timing circuit comprises one first timing circuit and one second timing circuit, described commutation circuit is coupled to described oscillator described first timing circuit after described at least one cold-cathode fluorescence lamp starts successfully, and when described at least one cold-cathode fluorescence lamp starts described oscillator is coupled to described second timing circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200017473U CN201349355Y (en) | 2009-01-24 | 2009-01-24 | Control circuit of zero-voltage switch resonance inverter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200017473U CN201349355Y (en) | 2009-01-24 | 2009-01-24 | Control circuit of zero-voltage switch resonance inverter |
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| CN201349355Y true CN201349355Y (en) | 2009-11-18 |
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| CNU2009200017473U Expired - Fee Related CN201349355Y (en) | 2009-01-24 | 2009-01-24 | Control circuit of zero-voltage switch resonance inverter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011069366A1 (en) * | 2010-06-18 | 2011-06-16 | Tao Shunzhu | Full voltage range llc resonant converter and control method thereof |
| CN112886820A (en) * | 2020-03-06 | 2021-06-01 | 陶顺祝 | Resonant circuit converter and control method |
| CN113824313A (en) * | 2020-06-19 | 2021-12-21 | 立锜科技股份有限公司 | Resonant switching power converter |
-
2009
- 2009-01-24 CN CNU2009200017473U patent/CN201349355Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011069366A1 (en) * | 2010-06-18 | 2011-06-16 | Tao Shunzhu | Full voltage range llc resonant converter and control method thereof |
| GB2494700A (en) * | 2010-06-18 | 2013-03-20 | Shunzhu Tao | Full voltage range LLC resonant converter and control method thereof |
| CN112886820A (en) * | 2020-03-06 | 2021-06-01 | 陶顺祝 | Resonant circuit converter and control method |
| CN112886820B (en) * | 2020-03-06 | 2022-11-18 | 陶顺祝 | Resonant circuit converter and control method |
| CN113824313A (en) * | 2020-06-19 | 2021-12-21 | 立锜科技股份有限公司 | Resonant switching power converter |
| CN113824313B (en) * | 2020-06-19 | 2022-12-27 | 立锜科技股份有限公司 | Resonant switching power converter |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091118 Termination date: 20130124 |