CN201869101U - Isolating drive circuit - Google Patents
Isolating drive circuit Download PDFInfo
- Publication number
- CN201869101U CN201869101U CN2010206446920U CN201020644692U CN201869101U CN 201869101 U CN201869101 U CN 201869101U CN 2010206446920 U CN2010206446920 U CN 2010206446920U CN 201020644692 U CN201020644692 U CN 201020644692U CN 201869101 U CN201869101 U CN 201869101U
- Authority
- CN
- China
- Prior art keywords
- switching
- switch pipe
- driving
- switching tube
- diode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Inverter Devices (AREA)
Abstract
The utility model relates to a drive circuit for two main switching tubes in a half-bridge topological circuit. The drive circuit consists of an isolating transformer that is provided with two secondary-side windings with opposite dotted terminals; the first secondary-side winding drives a first switching tube, a second secondary-side winding drives a second switching tube, and a primary-side winding of the isolating transformer is connected with a transformer drive unit; the drive unit directly adopts a duel-way complementary driver chip to be matched with certain simple devices of resistors, two drive switching tubes and a switching diode for driving, without an external auxiliary power supply and a drive chip thereof, so that the circuit is simple, and has low cost and stable working performance; and the secondary electrode of a driver transformer is provided with the switching diode to realize fast switching on and slow switching off of the driven switching tube, so as to be capable of effectively reducing the loss in switching of the driven switching tube, and voltage peak when the driven switching tube is switched off.
Description
Technical field
The utility model relates to the switch power technology field, is specifically related to the drive circuit of two main switches in the half-bridge topology circuit in the Switching Power Supply.
Background technology
The normal half-bridge topology circuit that adopts in the Switching Power Supply, the stable state shutoff voltage of switching tube only need equal input voltage and gets final product in this half-bridge topology circuit, do not resemble recommend, twice that the single-end ortho-exciting circuit need reach input voltage could drive, so the half-bridge topology circuit is widely used in the off-line conversion device of direct electrical network.Common half-bridge topology circuit as shown in Figure 1 in the Switching Power Supply, capacitor C 1 and C2 and switching tube Q1, Q2 form bridge, the diagonal of bridge connects the former limit winding of transformer TR2, if capacitor C 1, C2 appearance value equate at this moment, so when a certain switching tube conducting, connect voltage on the winding of this switching tube Q1, Q2 and have only half of supply voltage, so claim the half-bridge topology circuit.Switching tube Q1 source electrode connects outer power voltage Vbus, switching tube Q2 source ground in the half-bridge topology circuit.
The driving of half-bridge topology circuit has following characteristics: A, upper and lower bridge arm not altogether, and promptly two switching tubes of the former limit of transformer winding circuit are not altogether; B, isolation drive are promptly used isolating transformer, control isolating transformer with chip for driving, and isolating transformer provides enough driving voltages to power to the switching tube in the half-bridge circuit again, thereby reach the purpose of control switch pipe.The driving design of half-bridge circuit had a lot of outstanding technical schemes in the past, but such as push-pull type driving, full-bridge type driving, totem mode driving etc., all there is the problem of cost height, the external accessory power supply of palpus, complex circuit designs in type of drive in the past.
Summary of the invention
The purpose of this utility model is to solve isolated drive circuit in the past must external accessory power supply, the problem of complex circuit designs, so provide that a kind of circuit is succinct, the isolated drive circuit of main switch in the half-bridge topology circuit of stable performance.
For solving the problems of the technologies described above, the utility model is realized by the following technical solutions: isolated drive circuit, comprise isolating transformer, the former limit of described isolating transformer winding connects the transformer driver element, isolating transformer has two opposite secondary windings of end of the same name, its first secondary winding drives first switching tube, the second secondary winding drives the second switch pipe, described transformer driver element comprises that base stage directly is connected with two-way complementary drive chip drives output respectively, emitter-base bandgap grading connects winding two ends, the former limit of isolating transformer respectively, collector electrode interconnects and the first driving switch pipe and the second driving switch pipe of ground connection, and first switching diode, the second switch diode, first pull down resistor, second pull down resistor; The described first driving switch pipe, the second driving switch pipe emitter-base bandgap grading are connected with first switching diode, second switch diode cathode respectively, and above-mentioned two diode anodes connect the first driving switch pipe, the second driving switch pipe base stage respectively; The described first driving switch pipe, the second driving switch pipe base stage are also respectively by first pull down resistor, the second pull down resistor ground connection.
A kind of preferred scheme is: described isolating transformer first secondary winding end of the same name by first driving resistor connect the first switching tube grid, the different name end connects a switching tube source electrode; Described isolating transformer second secondary winding end of the same name connects second switch pipe source electrode, the different name end connects a switching tube grid by second driving resistor.
Preferred scheme is: also be connected with the 3rd switching diode between the described isolating transformer first secondary winding end of the same name and the first switching tube grid, and first secondary winding end of the same name connects the 3rd switching diode anode; Also be connected with the 4th switching diode between the second secondary winding different name end and the second switch tube grid, and the second secondary winding different name end connects the 4th switching diode anode.
Compared with prior art, the utlity model has following remarkable result: the utility model adopts directly driving transformer of two-way complementary drive chip, need not to increase other driving conversion chip that independently is provided with and corresponding power supplies; And form drive circuit by the first driving switch pipe, the second driving switch pipe, first switching diode, second switch diode and first pull down resistor, second pull down resistor and carry out plug-typely opening and turn-offing, circuit is succinct, cost is low, stable work in work.
And driving transformer is secondary to be established switching diode and realizes opening fast of driven switching tube and turn-off at a slow speed, can effectively reduce the loss when being driven the switching tube switch and switching and the due to voltage spikes when turn-offing.
Description of drawings
Fig. 1 is the half-bridge topology electrical block diagram that drive circuit described in the utility model is suitable for;
Fig. 2 is the principle schematic of isolated drive circuit described in the utility model.
Embodiment
For the ease of it will be appreciated by those skilled in the art that the utility model is explained in further detail below in conjunction with accompanying drawing and embodiment.
The utility model is mainly used in the Switching Power Supply, is used for driving two main switches of half-bridge topology circuit.
As Fig. 2, drive circuit described in the utility model comprises isolating transformer TR1, and it has two opposite secondary windings of end of the same name; Wherein, the first secondary winding drives the first switching tube Q1, and the second secondary winding drives second switch pipe Q2, and the former limit winding of isolating transformer TR1 connects the transformer driver element.
The transformer driver element comprises the first driving switch pipe T4 and the second driving switch pipe T5, reaches the first switching diode D5, second switch diode D6, the first pull down resistor R3, the second pull down resistor R4.The described first driving switch pipe T4 directly is connected with two-way complementary drive chip drives output respectively with the second driving switch pipe T5 base stage, emitter-base bandgap grading connects winding two ends, the former limit of isolating transformer TR1 respectively, collector electrode interconnects and ground connection.The described first driving switch pipe T4, the second driving switch pipe T5 emitter-base bandgap grading also are connected with the first switching diode D5, second switch diode D6 negative electrode respectively, and above-mentioned two diode anodes connect the first driving switch pipe T4, the second driving switch pipe T5 base stage respectively.The described first driving switch pipe T4, the second driving switch pipe T5 base stage are also respectively by the first pull down resistor R3, the second pull down resistor R4 ground connection.
During concrete enforcement, it is integrated chip or other chip functionally similar with it of TL494 or SG3525 that two-way complementary drive chip can adopt model.
Isolating transformer TR1 first secondary winding end of the same name by the first driving resistor R5 connect the first switching tube Q1 grid, the different name end connects a switching tube Q1 source electrode; Isolating transformer TR1 second secondary winding end of the same name connects second switch pipe Q2 source electrode, the different name end connects a switching tube Q2 grid by the second driving resistor R7.Also be connected with the 3rd switching diode D7 between the isolating transformer TR1 first secondary winding end of the same name and the first switching tube Q1 grid, and first secondary winding end of the same name connects the 3rd switching diode D7 anode; Also be connected with the 4th switching diode D8 between the second secondary winding different name end and the second switch pipe Q2 grid, and the second secondary winding different name end connects the 4th switching diode D8 anode.Be connected with the 3rd driving resistor R6 between the first switching tube Q1 source electrode and the grid, also be connected with the moving resistance R 8 of 4 wheel driven between second switch pipe Q2 source electrode and the grid.
The utility model operation principle is as follows: when the drive output Pin9 of two-way complementary drive chip be output as high level, when Pin10 is output as low level, the first driving switch pipe T4 ends, the second driving switch pipe T5 conducting, to ground, then isolating transformer TR1 second secondary winding different name end output high level provides forward drive signal Q2-G through switching diode D8 for switching tube Q2 in the half-bridge circuit to signal through diode D5, isolating transformer TR1, the second driving switch pipe T5; First secondary winding end output low level of the same name provides negative sense cut-off signals Q1-G through diode D7 for the switch Q1 in the half-bridge circuit.When the drive output Pin10 of TL494 be output as high level, when Pin9 is output as low level, the first driving switch pipe T4 conducting, the second driving switch pipe T5 ends, signal arrives ground through diode D6, the former limit of isolating transformer TR1 winding, the first driving switch pipe T4, then driving transformer TR1 first secondary winding end output of the same name high level provides forward drive signal Q1-G through diode D7 for half-bridge switch Q1, and the TR1 second secondary winding different name end output low level provides negative sense cut-off signals Q2-G through D8 for half-bridge switch Q2.When drive output Pin9, the Pin10 of TL494 export high level or low level simultaneously because of certain reason, driving switch pipe T4, T5 are failure to actuate, and do not work in the elementary no current of drive circuit loop, TR1 does not transmit energy to the secondary winding, thereby avoids the half-bridge circuit bridge arm direct pass.In this process, pull down resistor R3, R4 can guarantee the first driving switch pipe T4, the conducting of the second driving switch pipe T5.
The diode D7, the D8 that are parallel on driving resistor R5, the R7 can make switching tube Q1, Q2 realize opening fast shutoff at a slow speed, the due to voltage spikes when effectively reducing its switching loss and shutoff.Because being set, the diode D7, the D8 that are parallel on driving resistor R5, the R7 can effectively realize changing down soon the pass, cause that the speed of opening is slow, loss big and cause the higher components and parts of peak voltage when turn-offing and need not to be provided with electric capacity etc., and circuit has simply reduced cost, has improved the reliability of circuit.
The utility model not only is suitable for driving the switching device in the half-bridge topology circuit shown in Figure 1, equally also can be used for driving two switching devices on the same brachium pontis in the full-bridge topological circuit.When driving full-bridge circuit, corresponding two switching tube grids on the same brachium pontis in the full-bridge circuit, two the switching tube source electrodes in the corresponding respectively connection full-bridge circuit of Q1-S and Q2-S on the same brachium pontis of connecting of the output signal Q1-G of drive circuit and Q2-G difference.
The foregoing description is the preferred version that the utility model is realized; and indefiniteness is exhaustive; the utility model can also have other variations under same idea; need to prove; under the prerequisite that does not break away from the utility model design, any conspicuous replacement is all within the utility model protection range.
Claims (8)
1. isolated drive circuit, comprise isolating transformer (TR1), the former limit of described isolating transformer (TR1) winding connects the transformer driver element, isolating transformer (TR1) has two opposite secondary windings of end of the same name, its first secondary winding drives first switching tube (Q1), the second secondary winding drives second switch pipe (Q2), it is characterized in that: described transformer driver element comprises that base stage directly is connected with two-way complementary drive chip drives output respectively, emitter-base bandgap grading connects winding two ends, the former limit of isolating transformer (TR1) respectively, collector electrode interconnects and the first driving switch pipe (T4) and the second driving switch pipe (T5) of ground connection, and first switching diode (D5), second switch diode (D6), first pull down resistor (R3), second pull down resistor (R4);
The described first driving switch pipe (T4), second driving switch pipe (T5) emitter-base bandgap grading are connected with first switching diode (D5), second switch diode (D6) negative electrode respectively, and above-mentioned two diode anodes connect the first driving switch pipe (T4), second driving switch pipe (T5) base stage respectively;
The described first driving switch pipe (T4), second driving switch pipe (T5) base stage are also respectively by first pull down resistor (R3), second pull down resistor (R4) ground connection.
2. isolated drive circuit according to claim 1 is characterized in that: described isolating transformer (TR1) first secondary winding end of the same name connects a switching tube (Q1) source electrode by first driving resistor (R5) connection, first switching tube (Q1) grid, different name end; Described isolating transformer (TR1) second secondary winding end of the same name connects second switch pipe (Q2) source electrode, the different name end connects a switching tube (Q2) grid by second driving resistor (R7).
3. isolated drive circuit according to claim 2, it is characterized in that: also be connected with the 3rd switching diode (D7) between described isolating transformer (TR1) first secondary winding end of the same name and first switching tube (Q1) grid, and first secondary winding end of the same name connects the 3rd switching diode (D7) anode.
4. isolated drive circuit according to claim 2, it is characterized in that: also be connected with the 4th switching diode (D8) between the second secondary winding different name end and second switch pipe (Q2) grid, and the second secondary winding different name end connects the 4th switching diode (D8) anode.
5. according to claim 3 or 4 described isolated drive circuits, it is characterized in that: be connected with the 3rd driving resistor (R6) between described first switching tube (Q1) source electrode and the grid.
6. according to claim 3 or 4 described isolated drive circuits, it is characterized in that: be connected with the moving resistance (R8) of 4 wheel driven between second switch pipe (Q2) source electrode and the grid.
7. isolated drive circuit according to claim 1 is characterized in that: it is the integrated chip of TL494, SG3525 that described two-way complementary drive chip adopts model.
8. isolated drive circuit according to claim 1 is characterized in that: described isolated drive circuit is arranged in the half-bridge topology circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206446920U CN201869101U (en) | 2010-12-07 | 2010-12-07 | Isolating drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206446920U CN201869101U (en) | 2010-12-07 | 2010-12-07 | Isolating drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201869101U true CN201869101U (en) | 2011-06-15 |
Family
ID=44140243
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206446920U Expired - Fee Related CN201869101U (en) | 2010-12-07 | 2010-12-07 | Isolating drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201869101U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104883038A (en) * | 2015-06-15 | 2015-09-02 | 山东大学 | Half-bridge circuit employing negative voltage to turn off half-bridge circuit driver, and method |
| CN107306460A (en) * | 2016-04-25 | 2017-10-31 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and the half-bridge isolated drive circuit for it |
| CN110138219A (en) * | 2018-06-13 | 2019-08-16 | 任志广 | Digital voltage regulation module applied to high voltage power supply |
-
2010
- 2010-12-07 CN CN2010206446920U patent/CN201869101U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104883038A (en) * | 2015-06-15 | 2015-09-02 | 山东大学 | Half-bridge circuit employing negative voltage to turn off half-bridge circuit driver, and method |
| CN104883038B (en) * | 2015-06-15 | 2017-12-12 | 山东大学 | A kind of half-bridge circuit and its method that half-bridge circuit driver is turned off using negative pressure |
| CN107306460A (en) * | 2016-04-25 | 2017-10-31 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and the half-bridge isolated drive circuit for it |
| CN107306460B (en) * | 2016-04-25 | 2020-12-22 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating system and half-bridge isolation driving circuit used for same |
| CN110138219A (en) * | 2018-06-13 | 2019-08-16 | 任志广 | Digital voltage regulation module applied to high voltage power supply |
| CN110138219B (en) * | 2018-06-13 | 2020-11-24 | 任志广 | Digital voltage regulating module applied to high-voltage power supply |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103312171B (en) | Isolated soft switching double tube positive exciting resonance DC/DC circuit | |
| CN102904454B (en) | Efficient insulation DC (direct-current) converter system in photovoltaic power generation system | |
| CN113258774B (en) | Zero-voltage-turn-off zero-current-turn-on high-gain Boost converter | |
| CN101771353B (en) | Auxiliary source circuit for switch power supply | |
| CN202712965U (en) | Intelligentization energy-saving system capable of automatic switches between AC (alternating current) power supply and battery | |
| CN201230282Y (en) | Auxiliary electric source actuating apparatus for solar photovoltaic combining inverter | |
| CN202231632U (en) | Single-phase non-isolated form low common mode current photovoltaic grid connected inverter | |
| CN103354690B (en) | Auxiliary-winding-free primary side controlled LED (light-emitting diode) driving circuit and PFC (power factor correction) constant-current control circuit thereof | |
| CN101355305B (en) | Multifunctional active clamping structure-changing type double tube positive and negative sharp DC convertor | |
| CN201869101U (en) | Isolating drive circuit | |
| CN102035394B (en) | Forward topology synchronous rectification driver circuit | |
| CN201656780U (en) | Auxiliary source circuit applicable to switch power supply | |
| CN108322052A (en) | A kind of power-supply system based on silicon carbide device and a kind of DC/DC devices | |
| CN206524760U (en) | A kind of power initiation system for high withstand voltage eclipsed form DC DC converters | |
| CN202696465U (en) | Power device driving power supply for multilevel converter and high voltage frequency converter | |
| CN206250999U (en) | Many level export full-bridge inverter | |
| CN206313679U (en) | Low-voltage is input into the circuit topological structure of isolated multipath output switch power source | |
| CN203326884U (en) | Primary-side constant-current control quasi-single-stage high-power-factor circuit and device | |
| CN103259440B (en) | A kind of inverter power supply device | |
| CN206807284U (en) | A kind of non-bridge PFC circuits | |
| CN201418067Y (en) | Intelligent remote control switch with magnetic latching relay | |
| CN101854115B (en) | Time retention circuit for preventing current from back pumping and power inverter | |
| CN102624078A (en) | Power supplying switching method of direct current dual path input and device for implementing method | |
| CN217692770U (en) | High-efficient low pressure PWM solar control ware | |
| CN218694853U (en) | AC/DC solid relay |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110615 Termination date: 20131207 |