CN2202375Y - Power supply device of self-excited switch with overcurrent protection - Google Patents
Power supply device of self-excited switch with overcurrent protection Download PDFInfo
- Publication number
- CN2202375Y CN2202375Y CN 94220523 CN94220523U CN2202375Y CN 2202375 Y CN2202375 Y CN 2202375Y CN 94220523 CN94220523 CN 94220523 CN 94220523 U CN94220523 U CN 94220523U CN 2202375 Y CN2202375 Y CN 2202375Y
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- circuit
- power supply
- self
- positive feedback
- amplifier
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Abstract
Disclosed is a power supply device of self-excited switch with overcurrent protection. Because a simple and reliable current negative feedback circuit with overcurrent protection is adopted and a complementary bridge circuit, a capacitance coupled positive feedback circuit without direct current offset, and an oscillating circuit of alternating current power supply are matched, the power supply of self-excited switch is made to be a practical power supply device which has simple circuit, small size and low cost.
Description
The utility model relates to a kind of self-activated switch power supply apparatus with overcurrent protection function.
Self-activated switch power supply is exactly in fact a self-excited oscillator, can be used as thermatron when directly being exported by the self-oscillation coil, when can be used as general continuous-current plant when rectifier rectification is exported.It is simple that self-activated switch power supply has a circuit; volume is little, low cost and other advantages, but owing to lack a kind of simple and effective over-current protection method; its stability and reliability are all relatively poor, and this makes self-activated switch power supply never become a kind of reliable and practical supply unit.
The purpose of this utility model is to provide a kind of self-activated switch power supply apparatus with overcurrent protection, and it can overcome the shortcoming of existing self-activated switch power supply stability and poor reliability simply and effectively.
The purpose of this utility model is to realize like this.Fig. 1 is the schematic diagram of general self-activated switch power supply apparatus, and it comprises: power supply 1, amplifier 2, self-oscillation coil 3 and positive feedback coupling circuit 5.Self-oscillation coil 3 comprises main polarization coil La again, positive feedback coil Lb and output winding Lc.Fig. 2 is the schematic diagram of self-activated switch power supply apparatus under the utility model; it is except the basic structure with Fig. 1; it is characterized in that; add with output common port A in the input of amplifier 2 and to be connected to Current Negative Three-Point Capacitance resistance 4, the product of the current value of the resistance value of this Current Negative Three-Point Capacitance resistance and predetermined overcurrent protection point is close with the positive feedback voltage on the positive feedback coil Lb in the self-oscillation coil 3.When certain reason makes the electric current of amplifier 2 increase above the predetermined current value; negative feedback voltage on the Current Negative Three-Point Capacitance resistance 4 also and then increase to positive feedback coil Lb on positive feedback voltage close; because the amount of positive feedback deficiency forces the oscillating circuit failure of oscillation, reaches the purpose of overcurrent protection.
The utility model is the input and output common port adjunction Current Negative Three-Point Capacitance resistance of the amplifier in original device only, has solved the problem of overcurrent protection on the basis that increases installation cost and complexity hardly fully.
Below accompanying drawing is described, and in conjunction with the embodiments concrete structure of the present utility model and working condition are described further.
Fig. 1 is the schematic diagram of general self-activated switch power supply apparatus;
Fig. 2 is the schematic diagram of the utility model self-activated switch power supply apparatus;
Fig. 3 is the conspectus of an embodiment of the utility model self-activated switch power supply apparatus;
Fig. 4 is the conspectus of another embodiment of the utility model self-activated switch power supply apparatus.
Referring to Fig. 3, a switching power unit that constitutes according to the utility model shown in the figure, this device comprises: power supply 1, amplifier 2, self-oscillation coil 3, Current Negative Three-Point Capacitance resistance 4, positive feedback coupling circuit 5, start-oscillation circuit 6, secondary commutation circuit 7.
The 110V AC power behind rectifying and wave-filtering as power supply 1.Amplifier 2 adopts and all adds the complementary amplifier that is connected to Current Negative Three-Point Capacitance resistance 4 by two inputs and output common port to form complementary amplifier right, again by two complementary amplifiers to forming full bridge circuit.Oscillator coil 3 is by main polarization coil La, positive feedback coil Lb, and output winding Lc forms.Positive feedback coupling circuit 5 adopts capacitor-coupled, is connected to bridge circuit excitation end B by positive feedback coil Lb through the capacitor of positive feedback coupling circuit 5 and forms regenerative circuit.Start-oscillation circuit 6 is connected to bridge circuit excitation end B by AC power through current-limiting resistance and forms.Output winding Lc exports as DC power supply after 7 rectifications of secondary commutation circuit.
This full-bridge type amplifier is not having under the situation of start-oscillation circuit owing to there is not direct current biasing, and bridge circuit itself can't starting of oscillation.In order to make the bridge circuit starting of oscillation, be connected to the excitation end B of bridge circuit through the current-limiting resistance of start-oscillation circuit 6 by AC power.Under the alternating voltage effect, the B point voltage changes, and through the amplification of bridge circuit amplifier the voltage at main polarization coil La two ends is also and then changed, and makes whole bridge circuit starting of oscillation by the positive feedback effect of positive feedback coil Lb.Just no longer influenced by AC power when the bridge circuit starting of oscillation is later, but vibrate according to the natural frequency of bridge circuit.
The capacitor of positive feedback coupling circuit 5 plays the derivative action, thereby has improved the exciting current waveform, helps the switching loss of step-down amplifier, and the efficient of whole Switching Power Supply is improved.
When certain reason makes the electric current of amplifier 2 increase above predetermined value, owing to the negative feedback of Current Negative Three-Point Capacitance resistance 4, offset the positive feedback voltage of positive feedback coil Lb, make the amount of positive feedback deficiency, so vibration stops, reaching the purpose of overcurrent protection.After failure cause disappeared, bridge circuit is starting of oscillation once more under the start-oscillation circuit effect, recovered operate as normal.
The output of the output winding Lc of self-oscillation coil 3 can be used as DC power supply output after 7 rectifications of secondary commutation circuit.
Fig. 4 is another embodiment of the present utility model, wherein forms complementary amplifier to as half bridge circuit by the field effect transistor amplifier of a P raceway groove and a N raceway groove, and other half bridge circuit is replaced by two series capacitors 8, and its principle is the same with Fig. 3.
Claims (2)
1, a kind of self-activated switch power supply apparatus with overcurrent protection; comprise: power supply (1); amplifier (2); self-oscillation coil (3); positive feedback coupling circuit (5); it is characterized in that, be connected to Current Negative Three-Point Capacitance resistance (4) at the input of amplifier (2) and output common port, the product of the resistance value of this Current Negative Three-Point Capacitance resistance (4) and the current value of predetermined over-current protection point is close with the positive feedback voltage of the positive feedback coil Lb in the described self-oscillation coil (3).
2, supply unit according to claim 1 is characterized in that:
(1) described power supply (1) is an ac rectifying power source;
(2) to form complementary amplifier right for described amplifier (2) complementary amplifier that all is connected to Current Negative Three-Point Capacitance resistance (4) by two inputs and output common port, constitute forming full-bridge circuit by two described complementary amplifiers again, or constitute forming half-bridge circuit by two series capacitors (8) and a described complementary amplifier;
(3) described positive feedback coupling circuit (5) is used capacitor-coupled, promptly receives bridge circuit excitation end (B) by the positive feedback coil Lb in the described self-oscillation coil (3) through the capacitor of positive feedback coupling circuit (5) and forms regenerative circuit; And
(4) described supply unit also comprises a starting of oscillation circuit (6), and this circuit is received described bridge circuit excitation end (B) by AC power through current-limiting resistance and formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94220523 CN2202375Y (en) | 1994-09-03 | 1994-09-03 | Power supply device of self-excited switch with overcurrent protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94220523 CN2202375Y (en) | 1994-09-03 | 1994-09-03 | Power supply device of self-excited switch with overcurrent protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2202375Y true CN2202375Y (en) | 1995-06-28 |
Family
ID=33835103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94220523 Expired - Fee Related CN2202375Y (en) | 1994-09-03 | 1994-09-03 | Power supply device of self-excited switch with overcurrent protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2202375Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074942A (en) * | 2009-11-25 | 2011-05-25 | 深圳艾科创新微电子有限公司 | Overcurrent protection circuit |
| CN109327928A (en) * | 2018-09-20 | 2019-02-12 | 中国空气动力研究与发展中心超高速空气动力研究所 | Induction heating power inductance coil earthing or grounding means and earthing method |
-
1994
- 1994-09-03 CN CN 94220523 patent/CN2202375Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074942A (en) * | 2009-11-25 | 2011-05-25 | 深圳艾科创新微电子有限公司 | Overcurrent protection circuit |
| CN102074942B (en) * | 2009-11-25 | 2014-04-23 | 深圳艾科创新微电子有限公司 | Overcurrent protection circuit |
| CN109327928A (en) * | 2018-09-20 | 2019-02-12 | 中国空气动力研究与发展中心超高速空气动力研究所 | Induction heating power inductance coil earthing or grounding means and earthing method |
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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 |