CN2831603Y - Asymmetric semi-bridge power supplying device - Google Patents
Asymmetric semi-bridge power supplying device Download PDFInfo
- Publication number
- CN2831603Y CN2831603Y CN 200520018461 CN200520018461U CN2831603Y CN 2831603 Y CN2831603 Y CN 2831603Y CN 200520018461 CN200520018461 CN 200520018461 CN 200520018461 U CN200520018461 U CN 200520018461U CN 2831603 Y CN2831603 Y CN 2831603Y
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- drive circuit
- siding ring
- processor
- output
- transformer
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Abstract
The utility model relates to an asymmetric semi-bridge power supplying device which can be connected with many groups of transformers to be used by different peripheral devices. The utility model comprises a processor which can output positive and negative pulses, a front drive circuit, a back drive circuit, a transformer and a rectifier and filter circuit, wherein the front drive circuit and the back drive circuit are respectively connected with the processor, and the back drive circuit is connected in parallel with the transformer and a capacitor. The front drive circuit is switched on When the processor outputs positive pulses and the back drive circuit is switched on when the processor outputs negative pulses so as to make a secondary side coil of the transformer induct an output low voltage to output a stable direct current through the rectifier and filter circuit.
Description
Technical field
The utility model relates to a kind of power supply, particularly a kind of asymmetrical half-bridge formula power supply unit.
Background technology
Along with the continuous progress of digital technology, the external ancillary equipment of various electronic systems is also more and more many, and each external equipment needs different operating voltages because of self characteristics.
See also the circuit diagram of general power supply unit shown in Figure 4, this IC driver 10 drives first field-effect transistor 11 and second field-effect transistor 12 discriminably, makes it form different loops.When the IC driver is output as positive pulse, drive first field-effect transistor 11, so that a loop conducting, high-tension current first field-effect transistor 11 of flowing through is again through first siding ring, the electric capacity 14 of transformer 13, then directly in primary side ground connection.Simultaneously, the electric current that the second siding ring of transformer 13 is responded to is through over commutation, filter circuit 15, exportable galvanic current, and the ancillary equipment of the sub-product of powering uses.When IC driver 10 is output as negative pulse, drive second field-effect transistor 12, form the conducting in another loop, and, can allow the second siding ring of transformer 13 respond to once more by the effect that discharges and recharges of electric capacity, outwards export through over commutation, filter circuit 15 equally.Because above-mentioned loop must be through electric capacity 14 and in primary side ground connection, its manufacturing cost of IC of using driving transformer is higher, the space that still haves much room for improvement.
Summary of the invention
Main purpose of the present utility model provides a kind of asymmetrical half-bridge formula power supply unit, utilizes mode in parallel to connect many group transformers, so that export different voltage according to need, uses for different ancillary equipment.
Secondary objective of the present utility model provides a kind of asymmetrical half-bridge formula power supply unit, utilize a forward drive circuit and a reverse drive circuit to be coupled with a field-effect transistor respectively, make the conducting successively of each field-effect transistor, export, go into voltage with conversion, circuit arrangement is simplified, and reduced cost.
Above-mentioned purpose of the present utility model is achieved in that a kind of asymmetrical half-bridge formula power supply unit, it is characterized in that comprising:
One processor is the output source of positive and negative pulse;
At least one transformer comprises first siding ring and second siding ring, and this first siding ring connects an electric capacity;
One forward drive circuit, connection processing device are used so that described second siding ring induction output LOW voltage with the output positive pulse;
One reverse drive circuit, the connection processing device makes negative pulse oppositely be output as positive pulse, and this reverse drive circuit is in parallel with this first siding ring and electric capacity, and by capacitance discharges, makes second siding ring induction output LOW voltage; And
One rectification, filter circuit connect secondary coil, are used to export galvanic current.
Technique effect of the present utility model is can in parallelly organize transformers, and each transformer can be according to the actual different operating voltage of demand output, for different ancillary equipment uses more.
Below in conjunction with accompanying drawing the utility model is elaborated.
Description of drawings
Fig. 1 is the asymmetrical half-bridge formula power supply unit schematic diagram of the utility model one embodiment;
Fig. 2 is that the utility model one embodiment can be for the circuit diagram of many group transformers connected in parallel;
Fig. 3 is that the utility model one embodiment connects to organize the circuit diagrams of transformers more;
Fig. 4 is known asymmetrical half-bridge formula power supply unit schematic diagram.
Description of reference numerals: IC driver 10; First field-effect transistor 11; Second field-effect transistor 12; Transformer 13; Electric capacity 14; Rectification, filter circuit 15; Processor 1; Forward drive circuit 2; Reverse drive circuit 3; Rectification, filter circuit 4; Feedback circuit 5.
Embodiment
See also an embodiment of the utility model asymmetrical half-bridge formula power supply unit shown in Figure 1, comprise a processor 1, a transformer T2, a forward drive circuit 2, a reverse drive circuit 3, a rectification, filter circuit 4 and feedback circuit 5.
This processor 1 is by the control of pulse-width modulation (PWM) circuit, and to export a positive pulse and a negative pulse respectively, its model can be TDA16888 (also can be UC3845 or SG3845); This transformer T2 comprises first siding ring and second siding ring, and this first siding ring connects a capacitor C 3; This forward drive circuit 2 connects above-mentioned processor 1, with the output positive pulse; These reverse drive circuit 3 connection processing devices 1, make negative pulse 180 degree of processor 1 output oppositely be output as positive pulse, this reverse drive circuit 3 is in parallel with first siding ring and the capacitor C 3 of transformer T2, by the charge and discharge effect of capacitor C 3, make the second siding ring induction output LOW voltage of transformer T2.The second siding ring of this transformer T2 connects a rectification, filter circuit 4, to adjust the output galvanic current, uses for ancillary equipment.
Above-mentioned reverse drive circuit 3 comprises the bipolar junction transistor Q1 of a npn, the bipolar junction transistor Q2 of a pnp, a transformer T1 and a field-effect transistor Q3.The bipolar junction transistor Q1 of this npn capacitor C 1 that is coupled can be when processor 1 output positive pulse, conducting one low-tension supply, and make capacitor C 1 electric power storage.The bipolar junction transistor Q2 of this pnp above-mentioned capacitor C 1 that is coupled can conducting when processor 1 output negative pulse, and capacitor C 1 is carried out discharge process.
The first siding ring of this transformer T1 and 1 coupling of above-mentioned capacitor C are used so that the pole reversal of input voltage pulse; And the grid of field-effect transistor Q3 is connected with the second siding ring of transformer T1, when processor 1 output negative pulse, can make field-effect transistor Q3 conducting.Details are as follows for its start principle:
When the signal of processor 1 output is positive pulse, the electric current resistance R 3 of flowing through, the grid (Gate) of direct Driving Field effect transistor Q4, make the source electrode (source) and drain electrode (drain) conducting of field-effect transistor Q4, high-tension current (395V) flow through in regular turn first siding ring, capacitor C 3, field-effect transistor Q4, the resistance R 6 of transformer T2 are directly in primary side ground connection.And the positive pulse that processor is exported can make the bipolar junction transistor Q1 of npn conducting, so that electric current is amplified, again through the first siding ring of capacitor C 1, transformer T1, makes the identical voltage (15V) of second siding ring induction.But because of polarity is opposite, make that grid (Gate) voltage ratio source electrode (source) voltage of field-effect transistor Q3 is low, field-effect transistor Q3 can conducting.
When above-mentioned processor 1 output positive pulse, so that after high-tension current (395V) conducting, by 5 may command processors 1 of feedback circuit, make its output negative pulse, at this moment, field-effect transistor Q4 can't conducting.And field-effect transistor Q3 can conducting.Its reason is: when IC is output as negative pulse, the bipolar junction transistor Q2 of pnp conducting, and capacitor C 1 is discharged, first siding ring through transformer T1, make transformer T1 produce the voltage of back electromotive force, cause the current potential of the grid (Gate) of field-effect transistor Q3, and make field-effect transistor Q3 conducting than the high 15V of source electrode (Source).High-tension current is from capacitor C 3 discharge, through the other end of the first siding ring of transformer T2, field-effect transistor Q3, capacitor C 3 to form a loop.The formed electric current of the second siding ring of transformer T2 through filtering, the outside output DC of rectification circuit, uses for ancillary equipment.
See also shown in Figure 2, the utility model is when practical application, can group transformer T3 much more in parallel and filtering, rectification circuit (among the figure shown in the dotted line) use, also can be as shown in Figure 3, share a capacitor C 3, and group transformer T4 much more in parallel and filtering, rectification circuit (among the figure shown in the dotted line), to export the direct current of identical or different voltage according to the demand on actual the use.
Therefore, the utlity model has following advantage:
1, the set circuit of the utility model can be for connecting many group transformers, to provide respectively identical or different Operating voltage use for each ancillary equipment, quite have elasticity.
2, the set circuit of the utility model can utilize easy loop design, to carry out AC DC electric Conversion, and will be not all circuit integrated on an IC driver, can reach the purpose of cost.
In sum, the utility model really can reach the expection purpose of utility model, provides a kind of and not only can For connecting many group transformers, use for different ancillary equipment, and can reduce production costs asymmetric The semibridge system power supply unit has practical value.
Claims (6)
1, a kind of asymmetrical half-bridge formula power supply unit is characterized in that comprising:
One processor is the output source of positive and negative pulse;
At least one transformer comprises first siding ring and second siding ring, and this first siding ring connects an electric capacity;
One forward drive circuit, connection processing device are used so that described second siding ring induction output LOW voltage with the output positive pulse;
One reverse drive circuit, the connection processing device makes negative pulse oppositely be output as positive pulse, and this reverse drive circuit is in parallel with this first siding ring and electric capacity, and by capacitance discharges, makes second siding ring induction output LOW voltage; And
One rectification, filter circuit connect secondary coil, are used to export galvanic current.
2, asymmetrical half-bridge formula power supply unit as claimed in claim 1 is characterized in that, the model of this processor is TDA16888.
3, asymmetrical half-bridge formula power supply unit as claimed in claim 1 is characterized in that, the model of this processor is UC3845.
4, asymmetrical half-bridge formula power supply unit as claimed in claim 1 is characterized in that, the model of this processor is SG3845.
5, asymmetrical half-bridge formula power supply unit as claimed in claim 1 is characterized in that, also comprises a feedback circuit, with the output of the positive and negative pulse of processor controls.
6, asymmetrical half-bridge formula power supply unit as claimed in claim 1 is characterized in that, this reverse drive circuit comprises:
The bipolar junction transistor of one npn, an electric capacity is coupled;
The bipolar junction transistor of one pnp, above-mentioned electric capacity is coupled;
One transformer, its first siding ring and above-mentioned capacitive coupling; And
One field-effect transistor is connected with the second siding ring of above-mentioned transformer, by processor output negative pulse triggering and conducting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520018461 CN2831603Y (en) | 2005-05-11 | 2005-05-11 | Asymmetric semi-bridge power supplying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520018461 CN2831603Y (en) | 2005-05-11 | 2005-05-11 | Asymmetric semi-bridge power supplying device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2831603Y true CN2831603Y (en) | 2006-10-25 |
Family
ID=37136523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520018461 Expired - Fee Related CN2831603Y (en) | 2005-05-11 | 2005-05-11 | Asymmetric semi-bridge power supplying device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2831603Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113352A (en) * | 2014-07-22 | 2014-10-22 | 中国科学技术大学 | Transformer with self interference signal offsetting function and ultrahigh frequency radio frequency identification device (RFID) receiver front end based on same |
| CN105929295A (en) * | 2015-02-26 | 2016-09-07 | 株式会社昭和 | Sensor fault detection circuit, relative angle detection device, and motor-driven power steering apparatus |
-
2005
- 2005-05-11 CN CN 200520018461 patent/CN2831603Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104113352A (en) * | 2014-07-22 | 2014-10-22 | 中国科学技术大学 | Transformer with self interference signal offsetting function and ultrahigh frequency radio frequency identification device (RFID) receiver front end based on same |
| CN104113352B (en) * | 2014-07-22 | 2016-05-25 | 中国科学技术大学 | Have and offset the transformer of self-interference signal function and the ultrahigh frequency RFID receiver front end based on this transformer |
| CN105929295A (en) * | 2015-02-26 | 2016-09-07 | 株式会社昭和 | Sensor fault detection circuit, relative angle detection device, and motor-driven power steering apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |