CN102709884B - Bridge type LC (inductance capacitance) resonance circuit with overcurrent protection function - Google Patents
Bridge type LC (inductance capacitance) resonance circuit with overcurrent protection function Download PDFInfo
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- CN102709884B CN102709884B CN201210183358.3A CN201210183358A CN102709884B CN 102709884 B CN102709884 B CN 102709884B CN 201210183358 A CN201210183358 A CN 201210183358A CN 102709884 B CN102709884 B CN 102709884B
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Abstract
The invention provides a bridge type LC (inductance capacitance) resonance circuit with an overcurrent protection function. The bridge type LC resonance circuit comprises a switch circuit unit, a resonance circuit unit and an overcurrent protection unit, wherein the switch circuit unit is used for controlling the on-off state of driving signals of external loads, the resonance circuit unit is connected with the switch circuit unit and is used for generating high voltage, the overcurrent protection unit is connected with the switch circuit unit and the resonance circuit unit and is used for sampling current output by the switch circuit unit, and the switch circuit unit is forcibly switched off when the current is excessive. The bridge type LC resonance circuit with the overcurrent protection function is implemented in a zero-current switch-on mode, the circuit is protected, and simplicity and convenience are realized.
Description
Technical field
The present invention relates to circuit protection field, particularly a kind of bridge-type LC resonant circuit with overcurrent protection function.
Background technology
In the circuit containing electric capacity and inductance, if electric capacity and inductance in parallel, may appear in certain very little time period: the voltage of electric capacity raises gradually, and electric current reduces gradually; Meanwhile the electric current of inductance but increases gradually, and the voltage of inductance but reduces gradually.And within the time period that another is very little: the voltage of electric capacity reduces gradually, and electric current increases gradually; Meanwhile the electric current of inductance but reduces gradually, and the voltage of inductance but raises gradually.The increase of voltage can reach a positive maximum, and the reduction of voltage also can reach a negative maximum, and the change of positive negative direction also can occur same sense of current in this process, and now we are called that the vibration of electricity occurs circuit.
Electric capacity and inductance series connection, capacitor discharge, inductance starts to have a reverse recoil electric current, induction charging; When the voltage of inductance reaches maximum, capacitor discharge is complete, and inductance starts electric discharge afterwards, and electric capacity starts charging, and so reciprocal running, is called resonance.And in the process inductance due to continuous discharge and recharge, so just create electromagnetic wave.
Circuit oscillation phenomenon may fade away, and also may continue to maintain unchangeably.When shaking lasting maintenance, we are referred to as self-sustained oscillation, also referred to as resonance.
The time of resonance time electric capacity or inductance both end voltage change one-period is called harmonic period, and the inverse of harmonic period is called resonance frequency.The definition like this of so-called resonance frequency.The relating to parameters of it and electric capacity C and inductance L.
Bridge-type LC resonant circuit is used for the occasion that need produce high pressure, has two kinds of citation forms: half-bridge and full-bridge, but time all under the zero current turning-on pattern of resonance condition, easily causes upper and lower two switching tubes common, affect the fail safe of circuit.
Summary of the invention
The present invention proposes a kind of bridge-type LC resonant circuit with overcurrent protection function, when solving under prior art zero current turning-on pattern, easily causes upper and lower two switching tubes common, affects the problem of the fail safe of circuit.
Technical scheme of the present invention is achieved in that
The invention discloses a kind of bridge-type LC resonant circuit with overcurrent protection function; comprise the switching circuit unit of the break-make of the drive singal controlling applied load; the resonance circuit unit for generation of high pressure be connected with described switching circuit unit; also comprise the over-current protecting unit be connected with described switching circuit unit and resonance circuit unit; electric current for exporting described switching circuit unit samples; when current is excessive, described switching circuit unit is forced shutdown.
Have in the bridge-type LC resonant circuit of overcurrent protection function of the present invention; described switching circuit unit is made up of two groups of identical switching circuit subelements; often organize switching circuit subelement and comprise metal-oxide-semiconductor and resistance, the source electrode of metal-oxide-semiconductor is connected with described resonance circuit unit by resistance.
Have in the bridge-type LC resonant circuit of overcurrent protection function of the present invention, described resonance circuit unit comprises the first electric capacity, inductance, the second electric capacity, the 3rd electric capacity that are connected in series successively.
Have in the bridge-type LC resonant circuit of overcurrent protection function of the present invention; described over-current protecting unit comprises two triodes; first triode is connected with the first described switching circuit subelement, and the second triode is connected with described second switch circuit subelement.
Have in the bridge-type LC resonant circuit of overcurrent protection function of the present invention; the first described triode is connected with the first described switching circuit subelement; specifically: the collector electrode of the first described triode is connected with the grid of described metal-oxide-semiconductor; emitter is connected with described resonance circuit unit, the metal-oxide-semiconductor described in base stage connects and the common junction of described resistance.
Have in the bridge-type LC resonant circuit of overcurrent protection function of the present invention; the second described triode is connected with described second switch circuit subelement; specifically: the collector electrode of the second described triode is connected with the grid of described metal-oxide-semiconductor; emitter is connected with described resonance circuit unit, the metal-oxide-semiconductor described in base stage connects and the common junction of described resistance.
Have in the bridge-type LC resonant circuit of overcurrent protection function of the present invention, described triode is NPN type triode.
Implement a kind of bridge-type LC resonant circuit with overcurrent protection function of the present invention, there is following useful technique effect:
1, the mode of hardware is adopted to protect, safe and reliable;
2, protective circuit principle is simple and clear, convenient application;
3, the fatal drawback of traditional circuit is solved with few device.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the half-bridge resonance circuit diagram of prior art of the present invention;
Fig. 2 is the full-bridge resonant circuit figure of prior art of the present invention;
Fig. 3 is a kind of bridge-type LC resonant circuit figure with overcurrent protection function of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1 and Fig. 2, the resonant circuit of prior art of the present invention,
Fig. 1 is half-bridge structure, and the busbar voltage utilance of this kind of mode is 50%.I.e. VO≤0.5VIN
Fig. 2 is full bridge structure, and the busbar voltage utilance of this kind of mode is 100%.I.e. VO≤VIN
When these two kinds of circuit workings are in resonance condition, inductance L 1 electric capacity C1 electric capacity C2 electric capacity C3 can form a capacitive load, circuit working can be made in ZCS (zero current turning-on pattern) pattern.
Analyze for Fig. 1: under ZCS pattern, when switching tube Q1 is opening state, have I1 electric current to flow through, direction is just, now switching tube Q2 is off state, but when the moment that switching tube Q1 has just opened, flow continuously through in the parasitic diode D2 of the freewheel current I2 caused because of inductance L 1 in switching tube Q2 body, and direction is negative.Can not recover off state immediately because diode D2 has certain reverse recovery time, so now, switching tube Q1 and switching tube Q2 is conducting state, and this state maintenance time is within hundreds of ns.According to the difference of switching tube parameter, the time that conducting state maintains can be variant.Wherein, switching tube is metal-oxide-semiconductor: metal (metal)-oxide (oxid)-semiconductor (semiconductor) field-effect transistor.
According to Fig. 1, if switching tube Q1 switching tube Q2 conducting simultaneously, namely mean VIN short circuit, the electric current that switching tube produces can be very big, has a strong impact on the normal work of switching tube, and it even can be caused to damage.
Fig. 1 can work in ZCS pattern under resonance condition, thus causes upper and lower two switching tubes common, affects the fail safe of circuit.
Fig. 2 is full-bridge mode, and compared to Figure 1, many switching tube Q3, switching tube Q4, diode D3, diode D4, concrete connected mode as shown in Figure 2.
Unsteadiness existing for Fig. 2 and Producing reason identical with Fig. 1, herein not describe.
As shown in Figure 3; a kind of bridge-type LC resonant circuit figure with overcurrent protection function of the present invention; comprise the switching circuit unit of the break-make of the drive singal controlling applied load; the resonance circuit unit for generation of high pressure be connected with switching circuit unit; also comprise the over-current protecting unit be connected with switching circuit unit and resonance circuit unit; electric current for exporting switch circuit unit samples, and when current is excessive, is forced shutdown described switching circuit unit.
Specifically: switching tube Q1, diode D1, resistance R1 form the first switching circuit unit, switching tube Q2, diode D2, resistance R2 form second switch circuit unit; Electric capacity C1, inductance L 1, electric capacity C2, electric capacity C3 form resonance circuit unit; Triode K1 and triode K2 forms over-current protecting unit, and concrete connected mode as shown in Figure 3.
Work, protection philosophy is as follows:
When resonance, the circuit working of Fig. 3 is in ZCS pattern, and switching tube Q1 is normally, switching tube Q2 conducting because of the reason of diode D2.Because its electric current is negative, so the electric current I 1 that conducting simultaneously produces is greater than I2.When the value of I1 reaches the maximum rating of switching tube Q1, switching tube K1 conducting, forces the driving of switching tube Q1 to drag down, turn off.
When switching tube Q2 is normally, when switching tube Q1 is abnormal, the value of I2 is greater than I1, but when it reaches rated value, trigger triode K2 conducting, forces the driving of switching tube Q2 to drag down, turn off.
Triode K1/K2 is common NPN type triode, and BE pole needs the voltage of 0.6 ~ 0.7V to get final product conducting, sampling current on R1 and the magnitude of voltage Ube=I1*R1 that obtains.Ube is known as 0.7V herein, and I1 is the current value (for given value) for restriction, the therefore value=Ube/I1 of R1.
The protection which plays the switching device body overcurrent produced under ZCS pattern and under other working condition is reliably, fast, effectively.
Because the value of sample resistance R1 and resistance R2 is very little, therefore and produce loss negligible
Fig. 3, under the form of basic circuit, protects for switching tube.Under ZCS pattern, the current value of switch tube samples, and is forced shutdown when electric current is excessive.
Implement a kind of bridge-type LC resonant circuit with overcurrent protection function of the present invention, there is following useful technique effect:
1, the mode of hardware is adopted to protect, safe and reliable;
2, protective circuit principle is simple and clear, convenient application;
3, the fatal drawback of traditional circuit is solved with few device.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. one kind has the bridge-type LC resonant circuit of overcurrent protection function, comprise the switching circuit unit of the break-make of the drive singal controlling applied load, the resonance circuit unit for generation of high pressure be connected with described switching circuit unit, it is characterized in that, also comprise the over-current protecting unit be connected with described switching circuit unit and resonance circuit unit, electric current for exporting described switching circuit unit samples, and when current is excessive, forces to drag down described switching circuit unit; Described switching circuit unit is made up of two groups of identical switching circuit subelements, and often organize switching circuit subelement and comprise metal-oxide-semiconductor and resistance, the source electrode of metal-oxide-semiconductor is connected with described resonance circuit unit by resistance; Described over-current protecting unit comprises two triodes, and the first triode is connected with the first described switching circuit subelement, and the second triode is connected with described second switch circuit subelement; The first described triode is connected with the first described switching circuit subelement, specifically: the collector electrode of the first described triode is connected with the grid of described metal-oxide-semiconductor, emitter is connected with described resonance circuit unit, the metal-oxide-semiconductor described in base stage connects and the common junction of described resistance; The second described triode is connected with described second switch circuit subelement, specifically: the collector electrode of the second described triode is connected with the grid of described metal-oxide-semiconductor, emitter is connected with described resonance circuit unit, the metal-oxide-semiconductor described in base stage connects and the common junction of described resistance; Described resonance circuit unit comprises the first electric capacity, inductance, the second electric capacity, the 3rd electric capacity that are connected in series successively.
2. the bridge-type LC resonant circuit with overcurrent protection function according to claim 1, is characterized in that, described triode is NPN type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210183358.3A CN102709884B (en) | 2012-06-01 | 2012-06-01 | Bridge type LC (inductance capacitance) resonance circuit with overcurrent protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210183358.3A CN102709884B (en) | 2012-06-01 | 2012-06-01 | Bridge type LC (inductance capacitance) resonance circuit with overcurrent protection function |
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| CN102709884A CN102709884A (en) | 2012-10-03 |
| CN102709884B true CN102709884B (en) | 2015-01-21 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201294458Y (en) * | 2008-09-28 | 2009-08-19 | 深圳市同洲电子股份有限公司 | Bridge type converter capable of preventing bridge arm from direct connection and electronic equipment |
| CN101517853A (en) * | 2006-09-28 | 2009-08-26 | 奥斯兰姆施尔凡尼亚公司 | Inverter with improved overcurrent protection circuit, and power supply and electronic ballast therefor |
| CN202586300U (en) * | 2012-06-01 | 2012-12-05 | 深圳市朗科电器有限公司 | Bridge-type LC resonance circuit with overcurrent protection function |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001211059A (en) * | 2000-01-26 | 2001-08-03 | Toshiba Corp | Overcurrent protection circuit for semiconductor switch device |
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2012
- 2012-06-01 CN CN201210183358.3A patent/CN102709884B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101517853A (en) * | 2006-09-28 | 2009-08-26 | 奥斯兰姆施尔凡尼亚公司 | Inverter with improved overcurrent protection circuit, and power supply and electronic ballast therefor |
| CN201294458Y (en) * | 2008-09-28 | 2009-08-19 | 深圳市同洲电子股份有限公司 | Bridge type converter capable of preventing bridge arm from direct connection and electronic equipment |
| CN202586300U (en) * | 2012-06-01 | 2012-12-05 | 深圳市朗科电器有限公司 | Bridge-type LC resonance circuit with overcurrent protection function |
Non-Patent Citations (1)
| Title |
|---|
| 功率模块的过电流保护;林勇;《电源技术应用》;20050731;第8卷(第7期);第36－40页 * |
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Owner name: SHENZHEN LONGOOD INTELLIGENT ELECTRIC CO., LTD. Free format text: FORMER NAME: SHENZHEN LONGOOD ELECTRONICS CO., LTD. |
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Address after: Baoan District Shiyan street Shenzhen city Guangdong province 518000 house community AI Qun Lu with rich Industrial Zone No. 8-4 1, 2, 3 floor, building 5 floor left Patentee after: Shenzhen Longood Intelligent Electric Co., Ltd. Address before: Baoan District Shiyan street Shenzhen city Guangdong province 518000 house community AI Qun Lu with rich Industrial Zone No. 8-4 1, 2, 3 floor, building 5 floor left Patentee before: Shenzhen Langke Electrical Appliance Co., Ltd. |