CN203788150U - Drive circuit for switch type double-end direct-current converter - Google Patents
Drive circuit for switch type double-end direct-current converter Download PDFInfo
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- CN203788150U CN203788150U CN201320887009.XU CN201320887009U CN203788150U CN 203788150 U CN203788150 U CN 203788150U CN 201320887009 U CN201320887009 U CN 201320887009U CN 203788150 U CN203788150 U CN 203788150U
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Abstract
The utility model discloses a drive circuit for a switch type double-end direct-current converter. The drive circuit comprises a primary side voltage input end, a first drive signal output end, a second drive signal output end, a PWM controller, a transformer, a switch tube, a first diode, a second diode, a first resistor and a second resistor. The transformer comprises a primary side and two auxiliary sides. The PWM controller is in signal connection with the control end of the switch tube. One end of the primary side of the transformer is connected with a primary side area through the switch tube, and other end of the primary side is connected with the primary side voltage input end. One end of the first auxiliary side is connected with an anode of the first diode. A cathode of the first diode is connected with the first drive signal output end through the first resistor, and the other end of the first auxiliary side is connected with the first drive signal output end. The drive circuit is simple in structure and easy to achieve, high-end drive is naturally separated, additional drive loss and loss of a control chip are avoided, relation to the duty ratio is avoided, and the drive circuit is suitable for various double-end direct-current converters with high-end and low-end switch tubes to be switched at the same time.
Description
Technical field
The utility model relates to a kind of drive circuit of switching regulator both-end DC converter, belongs to drives technical field.
Background technology
Along with the development of electronic technology, the initial conditions of power supply is more and more harsher.Practice shows, both-end DC converter has wide input voltage range, the low feature of former limit switch tube voltage stress, and be widely used in every field.As the most important thing of this both-end DC converter, the drive circuit of switching tube is also subject to people's attention day by day.
The drive circuit of common both-end DC converter mostly is inverse-excitation type, and the high-end isolated driving both-end anti exciting converter of one as shown in Figure 1 of example has been made up of the drive circuit of converter driver for isolating and PWM controller.Utilize PWM controller to send to drive PWM waveform, wherein high-side driver switching tube utilizes driver for isolating and former limit and isolates, and completes the high-side driver of converter, and low side drives the PWM waveform that directly utilizes PWM controller to send, and drives; Simple in structure, easily realize, but high-side driver and low side driving can not make drive waveforms strict conformance in time, effect is undesirable.
Example transformer magnetic is as shown in Figure 2 isolated high low side and is driven both-end anti exciting converter, and electric capacity, the resistance of PWM controller in dotted line frame forms both-end and drives together with transformer.Complete magnetic isolation by transformer, the PWM drive waveforms that PWM controller is sent is divided into two-way by transformer, and independently duty ratio is consistent separately, the PWM drive waveforms of time consistency; Simple in structure, but drive voltage amplitude changes when change in duty cycle, and the operating voltage of controller increases, and the loss of chip own is increased, and has also increased the driving loss of switching tube, is unfavorable for the raising of transducer effciency.
Summary of the invention
The purpose of this utility model, be to provide a kind of drive circuit of switching regulator both-end DC converter, this circuit can ensure drive waveforms strict conformance in time, and drive waveform also can, with change in duty cycle, can not solve again the problem of energy dissipation well.
To achieve these goals, the technical scheme that the utility model adopts is as follows:
A kind of drive circuit of switching regulator both-end DC converter, comprise original edge voltage input, the first ~ the second drives signal output part, PWM controller, transformer, switching tube, the the first ~ the second diode and the first ~ the second resistance, described transformer comprises a former limit and two secondary, the control end of described PWM controller signals connecting valve pipe, one end of transformer primary side connects ground, former limit through switching tube, the other end connects original edge voltage input, one end of the first secondary connects the anode of the first diode, the negative electrode of the first diode connects first through the first resistance and drives signal output part, the other end of the first secondary connects first and drives signal output part, one end of the second secondary connects the anode of the second diode, the negative electrode of the second diode connects second through the second resistance and drives signal output part, the other end of the second secondary connects second and drives signal output part.
Further, also comprise magnetic reset circuit, described magnetic reset circuit is made up of the 4th diode and the transformer primary side winding being attached thereto; The different name end of transformer primary side winding is connected with transformer primary side Same Name of Ends, and the Same Name of Ends of transformer primary side winding is connected with the negative electrode of the 4th diode, the anodic bonding transformer primary side ground of the 4th diode.
Further, between described PWM controller and switching tube, also comprise the 3rd diode, the five ~ six resistance; Described PWM controller signals connects the 3rd diode anode, and the 3rd diode cathode is connected with one end of switch controlled end, the 6th resistance respectively through the 5th resistance, the ground, the former limit of other end connection transformer of the 6th resistance.
Further, described switching tube is selected metal-oxide-semiconductor, and the grid of described metal-oxide-semiconductor is connected with the 5th resistance, and drain electrode is connected with transformer primary side different name end, is connected source electrode and transformer primary side; Described metal-oxide-semiconductor also comprises a built-in diode, and described diode anode is connected with metal-oxide-semiconductor source electrode, and negative electrode is connected with metal-oxide-semiconductor drain electrode.
Further, two of described transformer secondary and the first ~ the second drive between signal output part and also comprise the first ~ the second diode, the three ~ four resistance, the second ~ three triode; Described transformer the first secondary Same Name of Ends is connected with one end of the 3rd resistance with the anode of the first diode respectively, the negative electrode of the first diode is connected with the emitter of the second triode and passes through the first resistance and is connected the first driving signal output part, the other end of the 3rd resistance is connected with the base stage of the second triode, and the collector electrode of the second triode is connected with the different name end of transformer the first secondary; Described transformer the second secondary Same Name of Ends is connected with one end of the 4th resistance with the anode of the second diode respectively, the negative electrode of the second diode is connected with the emitter of the 3rd triode and passes through the second resistance and is connected the first driving signal output part, the other end of the 4th resistance is connected with the base stage of the 3rd triode, and the collector electrode of the 3rd triode is connected with the different name end of transformer the first secondary.
Adopt after such scheme, the drive circuit of a kind of switching regulator both-end DC converter of the present utility model, circuit structure is simple, easily realize, and high-side driver is isolated naturally, do not increase extra driving loss and the loss of control chip, and and independent of duty cycle, be applicable to the both-end DC converter of various high-end and low-end switch pipe Simultaneous Switchings.
Brief description of the drawings
Fig. 1 is the circuit diagram of high-end isolated driving both-end anti exciting converter.
Fig. 2 is the circuit diagram that transformer magnetic is isolated high low side driving both-end anti exciting converter.
Fig. 3 is the drive circuit figure of switching regulator both-end DC converter of the present utility model.
Fig. 4 is switching regulator both-end DC converter drive circuit instance graph.
Wherein: the inlet highway voltage that Vbus is DC converter, PGND is ground, former limit, SGND is secondary ground, S1 is switching tube, T1, T2 is two transformers, D1, D2, D3, D4, D5, D6 is six diodes, Q1 is MOS switching tube, Q2, Q3 is two triodes, R1, R2, R3, R4, R5, R6, R7, R8 is eight resistance, VCC1 is drive circuit original edge voltage input, Vdrive1 is that the original PWM that PWM controller sends drives signal, Vdrive1 and Vm jointly form high-end switch pipe and drive signal, Vdrive2 and PGND form low-end switch pipe and drive signal.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is described in further detail.
As shown in Figure 3, for the drive circuit figure of switching regulator both-end DC converter of the present utility model, comprise original edge voltage input VCC1, PWM controller, transformer T1, switching tube S1, diode D1, D2 and resistance R 1, R2, described transformer T1 comprises a former limit and two secondary, the control end of described PWM controller signals connecting valve pipe S1, the one end on the former limit of transformer T1 connects former limit ground PGND through switching tube S1, the other end connects original edge voltage input VCC1, one end of the first secondary connects the positive pole of diode D1, the negative pole of diode D1 connects Vdrive1 through resistance R 1, the other end of the first secondary connects Vm, one end of the second secondary connects the positive pole of diode D2, the negative pole of diode D2 connects Vdrive2 through resistance R 2, the other end of the second secondary connects PGND, Vdrive1 and Vm jointly form high-end switch pipe and drive signal, Vdrive2 and PGND form low-end switch pipe and drive signal.
The operation principle of this drive circuit is as follows: when PWM controller sends while driving PWM waveform to be high level, the closed conducting of switching tube S1, one end that the former limit of transformer T1 is connected with original edge voltage input VCC1 is high level, simultaneously according to the Same Name of Ends principle of transformer, two secondary of transformer T1 are also high level with diode D1 and the anodal one end being connected of D2, two diode current flows, first drives signal output part Vdrive1 and second to drive signal output part Vdrive2 all to export high level, thereby makes DC converter circuit turn-on; Otherwise, when PWM controller sends while driving PWM waveform to be low level, switching tube S1 disconnects, one end that the former limit of transformer T1 is connected with original edge voltage input VCC1 is low level, according to the Same Name of Ends principle of transformer, two secondary of transformer T1 are also low levels with diode D1 and the anodal one end being connected of D2, two diode cut-offs simultaneously, first drives signal output part Vdrive1 and second to drive all output low levels of signal output part Vdrive2, and DC converter circuit cannot conducting.
As shown in Figure 4, for an application implementation illustration of drive circuit of the present utility model, comprise transformer T2, MOS switching tube Q1, triode Q2 and Q3, resistance R 3, R4, R5, R6, R7, R8, diode D3, D4, D5, D6.Wherein: transformer T2, MOS switching tube Q1, triode Q2 and Q3, resistance R 3, R4, R5, R6, R8, diode D3, D4, D5, D6 have formed the drive circuit of switching regulator both-end DC converter jointly, diode D5 and the Transformer Winding being attached thereto form magnetic reset circuit, and magnetic saturation occurs anti-driving transformer here at work.
Above embodiment is only explanation technological thought of the present utility model; can not limit protection range of the present utility model with this; every technological thought according to the utility model proposes, any change of doing on technical scheme basis, within all falling into the utility model protection range.
Claims (5)
1. the drive circuit of a switching regulator both-end DC converter, it is characterized in that: comprise original edge voltage input, the first ~ the second drives signal output part, PWM controller, transformer, switching tube, the the first ~ the second diode and the first ~ the second resistance, described transformer comprises a former limit and two secondary, the control end of described PWM controller signals connecting valve pipe, one end of transformer primary side connects ground, former limit through switching tube, the other end connects original edge voltage input, one end of the first secondary connects the anode of the first diode, the negative electrode of the first diode connects first through the first resistance and drives signal output part, the other end of the first secondary connects first and drives signal output part, one end of the second secondary connects the anode of the second diode, the negative electrode of the second diode connects second through the second resistance and drives signal output part, the other end of the second secondary connects second and drives signal output part.
2. the drive circuit of switching regulator both-end DC converter as claimed in claim 1, is characterized in that: also comprise magnetic reset circuit, described magnetic reset circuit is made up of the 4th diode and the transformer primary side winding that is attached thereto; The different name end of transformer primary side winding is connected with transformer primary side Same Name of Ends, and the Same Name of Ends of transformer primary side winding is connected with the negative electrode of the 4th diode, the anodic bonding transformer primary side ground of the 4th diode.
3. the drive circuit of switching regulator both-end DC converter as claimed in claim 1, is characterized in that: between described PWM controller and switching tube, also comprise the 3rd diode, the five ~ six resistance; Described PWM controller signals connects the 3rd diode anode, and the 3rd diode cathode is connected with one end of switch controlled end, the 6th resistance respectively through the 5th resistance, the ground, the former limit of other end connection transformer of the 6th resistance.
4. the drive circuit of switching regulator both-end DC converter as claimed in claim 3, it is characterized in that: described switching tube is selected metal-oxide-semiconductor, the grid of described metal-oxide-semiconductor is connected with the 5th resistance, and drain electrode is connected with transformer primary side different name end, is connected source electrode and transformer primary side; Described metal-oxide-semiconductor also comprises a built-in diode, and described diode anode is connected with metal-oxide-semiconductor source electrode, and negative electrode is connected with metal-oxide-semiconductor drain electrode.
5. the drive circuit of switching regulator both-end DC converter as claimed in claim 1, is characterized in that: two secondary of described transformer and the first ~ the second drive between signal output part and also comprise the first ~ the second diode, the three ~ four resistance, the second ~ three triode; Described transformer the first secondary Same Name of Ends is connected with one end of the 3rd resistance with the anode of the first diode respectively, the negative electrode of the first diode is connected with the emitter of the second triode and passes through the first resistance and is connected the first driving signal output part, the other end of the 3rd resistance is connected with the base stage of the second triode, and the collector electrode of the second triode is connected with the different name end of transformer the first secondary; Described transformer the second secondary Same Name of Ends is connected with one end of the 4th resistance with the anode of the second diode respectively, the negative electrode of the second diode is connected with the emitter of the 3rd triode and passes through the second resistance and is connected the first driving signal output part, the other end of the 4th resistance is connected with the base stage of the 3rd triode, and the collector electrode of the 3rd triode is connected with the different name end of transformer the first secondary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320887009.XU CN203788150U (en) | 2013-12-31 | 2013-12-31 | Drive circuit for switch type double-end direct-current converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320887009.XU CN203788150U (en) | 2013-12-31 | 2013-12-31 | Drive circuit for switch type double-end direct-current converter |
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| Publication Number | Publication Date |
|---|---|
| CN203788150U true CN203788150U (en) | 2014-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320887009.XU Expired - Fee Related CN203788150U (en) | 2013-12-31 | 2013-12-31 | Drive circuit for switch type double-end direct-current converter |
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| CN (1) | CN203788150U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103762848A (en) * | 2013-12-31 | 2014-04-30 | 江苏嘉钰新能源技术有限公司 | Drive circuit for switch type double-end direct-current converter |
-
2013
- 2013-12-31 CN CN201320887009.XU patent/CN203788150U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103762848A (en) * | 2013-12-31 | 2014-04-30 | 江苏嘉钰新能源技术有限公司 | Drive circuit for switch type double-end direct-current converter |
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| Date | Code | Title | Description |
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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: 20140820 Termination date: 20181231 |