CN202679230U - An anti-overshoot slow starting protection circuit with reference output - Google Patents
An anti-overshoot slow starting protection circuit with reference output Download PDFInfo
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- CN202679230U CN202679230U CN 201220221978 CN201220221978U CN202679230U CN 202679230 U CN202679230 U CN 202679230U CN 201220221978 CN201220221978 CN 201220221978 CN 201220221978 U CN201220221978 U CN 201220221978U CN 202679230 U CN202679230 U CN 202679230U
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Abstract
The utility model relates to an anti-overshoot slow starting protection circuit with reference output. The circuit comprises a NPN triode, a voltage-stabilizing tube, a diode, and an externally-connected capacitor. The output end of the diode and the externally-connected capacitor are connected with the base electrode of the triode. The diode is connected with the externally-connected capacitor in series. The voltage-stabilizing tube is connected with a group in parallel, the group containing the diode and the externally-connected capacitor which are connected in series. Two resistors are also connected with the group in parallel. A reference voltage output end is arranged between the two resistors. The reference slow starting protection circuit effectively eliminates overshoot voltage of a started up power supply without loads. Operating characteristic curve of the triode and charge-discharge characteristic of the capacitor are fully utilized in the design. By adding a reference slow starting circuit on the basis of the slow starting capacitor applied to a conventional pulse control chip, an overshoot phenomenon when the high-voltage power supply without loads is powered on is eliminated so that damage to equipment and the power supply itself resulting from overshoot voltage when the high-voltage power supply is powered on is guaranteed not to be generated any more.
Description
Technical field
The utility model belongs to start voltage overshoot resist technology field, the slow starting protection circuit of the anti-overshoot of benchmark output of the zero load start overshoot protection of a kind of (KV level) output circuit of realizing having high voltage that specially refers to.
Background technology
In recent years, middle high-power high voltage special power supply is widely used in science and techniques of defence, the military equipment, especially work in radar, the such pulse load high-power high voltage special power supply of travelling wave tube, generally these equipment are very harsh to power requirement, voltage request is fixed value, in case power on, the supply voltage output valve never allows to surpass set point, otherwise the lighter damages power supply, the severe one damage equipment.And the general high voltage power supply just increases soft-start circuit at the pulse control chip, 8 pin such as KA3525 connect electric capacity, this mode can only be alleviated the voltage overshoot value to a certain extent, can not effectively eliminate voltage overshoot, and this is owing to the power transformer leakage inductance causes.
The utility model content
For the deficiency on the prior art; the utility model is that purpose is to be to provide a kind of can eliminate main power transformer leakage inductance fully and cause unloaded start voltage-overshoot problem; its circuit is simple and easy, has realized having the zero load start overshoot protection function of high voltage (KV level) output circuit.
To achieve these goals, the utility model is to realize by the following technical solutions:
The slow starting protection circuit of the anti-overshoot of a kind of benchmark output; it comprises NPN triode, voltage-stabiliser tube, diode and external capacitor; the output of described diode is connected the base stage that connects the NPN triode with external capacitor; described diode and external capacitor are in series; described voltage-stabiliser tube and diode and external capacitor all are connected in parallel; outside diode and external capacitor, also be parallel with two resistance, between two resistance, be located at reference voltage output end.
The slow starting protection circuit of the above-mentioned anti-overshoot of a kind of benchmark output; wherein; the slow starting protection circuit of the anti-overshoot of described benchmark output also comprises first resistance of all connecting with NPN triode, voltage-stabiliser tube, diode and external capacitor; this the first resistance one end connects accessory power supply, and its other end connects voltage-stabiliser tube and diode.
The slow starting protection circuit of the above-mentioned anti-overshoot of a kind of benchmark output, wherein, the voltage of described accessory power supply is 12V.
The utility model is effectively eliminated the benchmark soft-start circuit of the unloaded start of power supply voltage overshoot.This design takes full advantage of the characteristic of characteristic working curve and the capacitor charge and discharge of triode.By adding at traditional pulse control chip on the slow start-up capacitance basis, increase the benchmark soft-start circuit, start overshoot phenomenon when having realized that the elimination high voltage source is unloaded has guaranteed that the equipment that caused by high voltage source start overshoot and the problem of power supply damage itself no longer occur.
Description of drawings
Describe the utility model in detail below in conjunction with the drawings and specific embodiments;
Fig. 1 is to be the circuit diagram of the utility model one embodiment;
Fig. 2 is the circuit diagram of another embodiment of the utility model.
Embodiment
For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with embodiment, further set forth the utility model.
Referring to Fig. 1 and Fig. 2, the slow starting protection circuit of the utility model anti-overshoot of a kind of benchmark output, it comprises NPN triode Q1, voltage-stabiliser tube V
Z, diode D1 and external capacitor C1, the output of described diode D1 is connected the base stage that connects the NPN triode with external capacitor, described diode D1 and external capacitor are in series, described voltage-stabiliser tube and diode D1 and external capacitor C1 all are connected in parallel, outside diode D1 and external capacitor C1, also be parallel with two resistance R 2, R3, between two resistance R 2, R3, be located at reference voltage output end.
Fig. 1 accessory power supply voltage of the present utility model is-circuit diagram when 12V powers on; It also comprises and NPN triode Q1, voltage-stabiliser tube V
Z, diode D1 and external capacitor C1 first resistance R 1 of all connecting, the accessory power supply of this first resistance R 1 one end connection-12V, its other end connects voltage-stabiliser tube V
ZInput with diode D1.
Fig. 2 accessory power supply voltage of the present utility model is+circuit diagram when 12V powers on; It also comprises and NPN triode Q1, voltage-stabiliser tube V
Z, diode D1 and external capacitor C1 first resistance R 1 of all connecting, the accessory power supply of this first resistance R 1 one end connection-12V, its other end connects voltage-stabiliser tube V
ZInput and external capacitor C1.
The principle of this circuit working is: accessory power supply voltage-12V powers on, electric current will be penetrated parasitic capacitance Cbe to external capacitor C 1 charging by the base of resistance R 1 and NPN triode Q1, charging initial stage NPN triode Q1 base potential is drawn high, NPN triode Q1 conducting then A point current potential is clamped at 0V, then benchmark output Vref=R3/ (R1+R3) VA=0V.
The current potential of proceeding NPN triode Q1 base stage along with charging is step-down slowly, and NPN triode Q1 works in again the saturation region, such A point current potential slow decreasing, then also slow decreasing of benchmark output Vref=R3/ (R1+R3) VA current potential; After charging is finished, NPN triode Q1 base potential step-down, NPN triode Q1 ends fully, and A point current potential equals voltage-stabiliser tube Vz both end voltage, and then benchmark output voltage V ref=R3/ (R1+R3) VA namely is the reference voltage value that needs design.
In order to make capacitor C 1 both end voltage reduce to very soon 0V, increase a reverse fast recovery diode D1 at NPN triode Q1 base emitter-base bandgap grading during outage.
Reference voltage often differed the about 4-5V of absolute value with feedback voltage 0V when present embodiment had just been started shooting, and this will make the full pulsewidth output of pulse width controller, and output voltage is prone to overshoot; The hypothesis reference voltage can be slowly given now, make in the difference of reference voltage and feedback voltage absolute value remains at very among a small circle, can greatly alleviate power-supply system and adjust burden, therefore increase the benchmark soft-start circuit on the soft-start circuit basis of impulse controller and eliminate the High voltage output overshoot to reach.
Present embodiment comprised design, the pcb board of circuit theory design, with the connected mode of power-supply system, it has utilized external capacitor adjustment slow start-up time, triode operating characteristic, the positive negative value of distinguishing reference voltage, connection and the working method of circuit.
The utility model is effectively eliminated the benchmark soft-start circuit of the unloaded start of power supply voltage overshoot by the slow starting protection circuit of the anti-overshoot of simple benchmark output; This design takes full advantage of the characteristic of characteristic working curve and the capacitor charge and discharge of triode.By adding at traditional pulse control chip on the slow start-up capacitance basis, increase the benchmark soft-start circuit, start overshoot phenomenon when having realized that the elimination high voltage source is unloaded has guaranteed that the equipment that caused by high voltage source start overshoot and the problem of power supply damage itself no longer occur.
More than show and described basic principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that describes in above-described embodiment and the specification just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (3)
1. the starting protection circuit is delayed in the anti-overshoot of benchmark output; it is characterized in that; it comprises NPN triode, voltage-stabiliser tube, diode and external capacitor; the output of described diode is connected the base stage that connects the NPN triode with external capacitor; described diode and external capacitor are in series; described voltage-stabiliser tube and diode and external capacitor all are connected in parallel, and also are parallel with two resistance outside described diode and external capacitor, are located at reference voltage output end between two described resistance.
2. the starting protection circuit is delayed in the anti-overshoot of a kind of benchmark output according to claim 1; it is characterized in that; the slow starting protection circuit of the anti-overshoot of described benchmark output also comprises first resistance of all connecting with NPN triode, voltage-stabiliser tube, diode and external capacitor; this the first resistance one end connects accessory power supply, and its other end connects voltage-stabiliser tube and diode.
3. the slow starting protection circuit of the anti-overshoot of a kind of benchmark output according to claim 2 is characterized in that the voltage of described accessory power supply is 12V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220221978 CN202679230U (en) | 2012-05-17 | 2012-05-17 | An anti-overshoot slow starting protection circuit with reference output |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220221978 CN202679230U (en) | 2012-05-17 | 2012-05-17 | An anti-overshoot slow starting protection circuit with reference output |
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| Publication Number | Publication Date |
|---|---|
| CN202679230U true CN202679230U (en) | 2013-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220221978 Expired - Fee Related CN202679230U (en) | 2012-05-17 | 2012-05-17 | An anti-overshoot slow starting protection circuit with reference output |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106612067A (en) * | 2017-01-06 | 2017-05-03 | 浙江凯耀照明股份有限公司 | Overcharging preventive rapid charging circuit |
| CN107834835A (en) * | 2017-11-10 | 2018-03-23 | 中国科学院西安光学精密机械研究所 | High-integration high-calendering slow starting device |
-
2012
- 2012-05-17 CN CN 201220221978 patent/CN202679230U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106612067A (en) * | 2017-01-06 | 2017-05-03 | 浙江凯耀照明股份有限公司 | Overcharging preventive rapid charging circuit |
| CN107834835A (en) * | 2017-11-10 | 2018-03-23 | 中国科学院西安光学精密机械研究所 | High-integration high-calendering slow starting device |
| CN107834835B (en) * | 2017-11-10 | 2024-05-31 | 中国科学院西安光学精密机械研究所 | High integration level high calendering slow starting drive |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130116 Termination date: 20180517 |
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| CF01 | Termination of patent right due to non-payment of annual fee |