CN203522520U - DC power supply starting circuit - Google Patents
DC power supply starting circuit Download PDFInfo
- Publication number
- CN203522520U CN203522520U CN201320597846.9U CN201320597846U CN203522520U CN 203522520 U CN203522520 U CN 203522520U CN 201320597846 U CN201320597846 U CN 201320597846U CN 203522520 U CN203522520 U CN 203522520U
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- power supply
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- terminal
- flow input
- input end
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Abstract
The utility model discloses a DC power supply starting circuit including a DC input terminal, a DC output terminal, a switch tube, a charging and discharging capacitor, a constant current diode and a current discharging circuit. The switch tube is connected in series between a negative electrode of the DC input terminal and a negative electrode of the DC output terminal; a positive electrode of the constant current diode is connected with a positive electrode of the DC input terminal, a negative electrode of the constant current diode is connected with a first terminal of the charging and discharging capacitor, and a second terminal of the charging and discharging capacitor is connected with the negative electrode of the DC input terminal; a control terminal of the switch tube is connected with the first terminal of the charging and discharging capacitor; and one terminal of the current discharging circuit is connected with the first terminal of the charging and discharging capacitor, and the other terminal is connected with the second terminal of the charging and discharging capacitor. By adopting the DC power supply starting circuit, current impact on a pre-stage power supply in the moment of powering on a load device is alleviated, cutoff of the pre-stage power supply caused by an over-instantaneous-current when the load device is powered on is prevented, and stability of the device is improved.
Description
[technical field]
The utility model relates to DC power supply, relates in particular to a kind of DC power supply start-up circuit.
[background technology]
Load equipment powered on moment forward level power supply absorb instantaneous large-current, to large impulse current of prime power generation.For example: the DC-DC intrinsic safety electric source that colliery industry is used is generally all provided with current limit, when the required electric current of load surpasses Limited Current, intrinsic safety electric source will turn-off.Load equipment can absorb a large amount of immediate currents to intrinsic safety electric source at powered on moment, and intrinsic safety electric source is produced to a large rush of current, thereby causes intrinsic safety electric source to turn-off and cisco unity malfunction.
[summary of the invention]
The technical problems to be solved in the utility model is for there being the DC power supply of overcurrent protection that a kind of start-up circuit is provided; while powering on to reduce load equipment; the immediate current absorbing from DC power supply, avoids DC power supply because of overcurrent cisco unity malfunction, improves the stability of equipment.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is, a kind of DC power supply start-up circuit, comprise direct-flow input end, DC output end, switching tube, charge and discharge electric capacity, current regulator diode and bleeder circuit, switching tube is serially connected between direct-flow input end negative pole and DC output end negative pole; The positive pole of current regulator diode connects the positive pole of direct-flow input end, and the negative pole of current regulator diode connects the first end that charges and discharge electric capacity,, charge and discharge the negative pole of the second termination direct-flow input end of electric capacity; The control termination of switching tube discharges and recharges the first end of appearance; One termination of bleeder circuit discharges and recharges the first end of appearance, and another termination discharges and recharges the second end of appearance.
Above-described DC power supply start-up circuit, comprises voltage stabilizing didoe and biasing resistor, and the negative electrode of voltage stabilizing didoe connects the first end that charges and discharge electric capacity, and the anode of voltage stabilizing didoe connects the positive pole of direct-flow input end by biasing resistor; The anode of the control termination voltage stabilizing didoe of switching tube.
Above-described DC power supply start-up circuit, described bleeder circuit comprises earial drainage diode and bleeder resistor, and the anode of earial drainage diode connects the first end that charges and discharge electric capacity, and negative electrode connects the anode of direct-flow input end; Bleeder resistor is connected between the anode and negative electrode of direct-flow input end.
The utility model can relax load equipment at powered on moment the rush of current to front level power supply, while preventing prime power supply electrifying, because transient current is excessive, turn-off, improved the stability of equipment.
[accompanying drawing explanation]
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is the schematic diagram of the utility model embodiment 1 DC power supply start-up circuit.
[embodiment]
The structural principle of the utility model embodiment 1 DC power supply start-up circuit as shown in Figure 1, comprises the direct-flow input end, the DC output end that are connected with front level power supply.Both positive and negative polarity Vin+ and the Vin-of direct-flow input end connect respectively front level power supply, and DC output end connects DC-DC change-over circuit, the output termination DC load of DC-DC change-over circuit.
DC power supply start-up circuit also comprises field effect transistor Q1 as switching tube, charges and discharge electric capacity C1, earial drainage diode D2, current regulator diode D3, bleeder resistor R1, voltage stabilizing didoe and biasing resistor R3.
Field effect transistor Q1 is serially connected between direct-flow input end negative pole and DC output end negative pole.
Earial drainage diode D2 and bleeder resistor R1 form bleeder circuit, and the anode of earial drainage diode D2 connects the first end that charges and discharge electric capacity C1, and negative electrode connects the anode of direct-flow input end.Bleeder resistor R1 is connected between the anode and negative electrode of direct-flow input end.
Current regulator diode D3 is connected in series with charging and discharging electric capacity C1 as current-limiting circuit, and the positive pole of current regulator diode connects the positive pole of direct-flow input end, and the negative pole of current regulator diode connects the first end that charges and discharge electric capacity C1, charges and discharge the negative pole of the second termination direct-flow input end of electric capacity C1.
The negative electrode of voltage stabilizing didoe D4 connects the first end that charges and discharge electric capacity C1, and the anode of voltage stabilizing didoe D4 connects the positive pole of direct-flow input end by biasing resistor R3.The anode of the control termination voltage stabilizing didoe D4 of field effect transistor Q1.
When current level power supply powers on, field effect transistor Q1 is in off state, front level power supply charges to charging and discharging electric capacity C1 by current regulator diode D3, when the voltage in capacitor C 1 rises to certain numerical value, make voltage stabilizing didoe D4 reverse-conducting, biasing resistor R3 both end voltage rises, and drives field effect transistor Q1 conducting gradually.
After field effect transistor Q1 conducting, load equipment is communicated with front level power supply by field effect transistor Q1, and along with the voltage at capacitor C 1 two ends raises gradually, the impedance of field effect transistor Q1 gradually becomes Low ESR from high impedance, until the complete conducting of field effect transistor Q1.
Due to voltage stabilizing didoe D4 and the delayed action that charges and discharge electric capacity C1, guaranteed in the process of field effect transistor Q1 conducting, front level power supply is set up completely.The supply power voltage of DC-DC transducer reaches after certain determined value, starts normally to carry out voltage transitions, thereby electric current is provided to rear class load, so this circuit plays the slow effect starting.
When current level power supply turn-offs output, charge and discharge electric capacity C1, earial drainage diode D2 and bleeder resistor R1 and form a closed-loop path, capacitor C 1 is by diode D2 and resistance R 1 electric discharge, and when the voltage at capacitor C 1 two ends is during lower than the cut-in voltage of field effect transistor Q1, field effect transistor Q1 turn-offs.
The On current substantially constant of current regulator diode D3, makes charging interval linearity controlled, thereby makes slow start-up time controlled.Charge and discharge electric capacity C1 charges by current regulator diode D3 simultaneously; Rise to the puncture voltage of voltage stabilizing didoe D4 in C1 both end voltage before, the voltage at biasing resistor R3 two ends is 0, not conducting of field effect transistor Q1; Along with C1 both end voltage rises gradually, when rising to the threshold value (such as 5V) of voltage stabilizing didoe D4, voltage stabilizing didoe D4 reverse-conducting, biasing resistor R3 both end voltage rises, thereby drives field effect transistor Q1 conducting, and slow startup completes.In the present embodiment, utilize the controllable current of current regulator diode and the start-up time that voltage stabilizing didoe D4 has delayed circuit effectively.
The above embodiment of the utility model can relax load equipment at powered on moment the rush of current to front level power supply, while guaranteeing prime power supply electrifying, can not turn-off because transient current is excessive.
Claims (3)
1. a DC power supply start-up circuit, comprises direct-flow input end and DC output end, it is characterized in that, comprises switching tube, charges and discharge electric capacity, current regulator diode and bleeder circuit, and switching tube is serially connected between direct-flow input end negative pole and DC output end negative pole; The positive pole of current regulator diode connects the positive pole of direct-flow input end, and the negative pole of current regulator diode connects the first end that charges and discharge electric capacity,, charge and discharge the negative pole of the second termination direct-flow input end of electric capacity; The control termination of switching tube discharges and recharges the first end of appearance; One termination of bleeder circuit discharges and recharges the first end of appearance, and another termination discharges and recharges the second end of appearance.
2. DC power supply start-up circuit according to claim 1, is characterized in that, comprises voltage stabilizing didoe and biasing resistor, and the negative electrode of voltage stabilizing didoe connects the first end that charges and discharge electric capacity, and the anode of voltage stabilizing didoe connects the positive pole of direct-flow input end by biasing resistor; The anode of the control termination voltage stabilizing didoe of switching tube.
3. DC power supply start-up circuit according to claim 2, is characterized in that, described bleeder circuit comprises earial drainage diode and bleeder resistor, and the anode of earial drainage diode connects the first end that charges and discharge electric capacity, and negative electrode connects the anode of direct-flow input end; Bleeder resistor is connected between the anode and negative electrode of direct-flow input end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320597846.9U CN203522520U (en) | 2013-09-26 | 2013-09-26 | DC power supply starting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320597846.9U CN203522520U (en) | 2013-09-26 | 2013-09-26 | DC power supply starting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203522520U true CN203522520U (en) | 2014-04-02 |
Family
ID=50381393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320597846.9U Expired - Lifetime CN203522520U (en) | 2013-09-26 | 2013-09-26 | DC power supply starting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203522520U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532366A (en) * | 2013-09-26 | 2014-01-22 | 深圳市三旺通信技术有限公司 | Starting method and starting circuit of direct-current power supply |
-
2013
- 2013-09-26 CN CN201320597846.9U patent/CN203522520U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532366A (en) * | 2013-09-26 | 2014-01-22 | 深圳市三旺通信技术有限公司 | Starting method and starting circuit of direct-current power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: The 1 District of Nanshan District high tech Industrial Park, Xili Street Baiwang letter 518000 Shenzhen city in Guangdong province 3 Patentee after: 3ONEDATA Co.,Ltd. Address before: 518000 Guangdong city of Shenzhen province Nanshan District Xili town nine Xiang Ling Industrial Zone 2 Building 3 floor, East Wing Patentee before: SHENZHEN 3ONEDATA TECHNOLOGY Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140402 |