CN103151911A - Starting protection circuit suitable for wide voltage input range - Google Patents
Starting protection circuit suitable for wide voltage input range Download PDFInfo
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- CN103151911A CN103151911A CN2013100941886A CN201310094188A CN103151911A CN 103151911 A CN103151911 A CN 103151911A CN 2013100941886 A CN2013100941886 A CN 2013100941886A CN 201310094188 A CN201310094188 A CN 201310094188A CN 103151911 A CN103151911 A CN 103151911A
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Abstract
The invention provides a starting protection circuit suitable for a wide voltage input range. The starting protection circuit comprises a voltage stabilizing diode, a capacitor, a power supply module, a current limiting unit, a switch module and a charging diode, wherein the power supply module is connected with the voltage stabilizing diode and supplies electricity for the voltage stabilizing diode, and the voltage stabilizing diode controls the connection of the switch module; the current limiting unit is connected with the power supply module in parallel; and the current limiting unit, the switch module, the charging diode and the capacitor are sequentially connected in series. The starting protection circuit also comprises a detecting control module, and the detecting control module is used for detecting the temperature of the current limiting unit or the temperature of the switch module and controlling the running state of the switch module according to the detected temperature. The starting protection circuit has the beneficial effects that a starting circuit can be quickly effectively protected when a circuit power supply is out of order in a wide voltage input occasion, and the self-recovery function of the power supply is not influenced; a huge starting circuit hot-redundancy design is avoided; the project realization is simple; and the cost is low.
Description
Technical field
The present invention relates to protective circuit, relate in particular to a kind of starting protection circuit that is applicable to wide range input voltage.
Background technology
In small-power power, the general employing of the power supply of its control circuit part charges to cut-in voltage by start-up circuit, powered by feedback winding or coupling coil after circuit start.Start-up circuit is generally taked three kinds of Starting mode: directly going here and there electric-resistivity method, voltage stabilizing didoe coordinates triode and the linear Source Method of resistor group, voltage stabilizing didoe to coordinate MOSFET and resistance to form the switch mode power method.Wherein the front dual mode is being worked always, and cost is low, efficient is low, is fit to the little occasion of change range of input voltage.Last a kind of start-up circuit that is comprised of voltage stabilizing didoe, MOSFET and resistance is only worked when circuit start, withdraws from when power work is normal, thus have higher efficient, but cost is higher, is suitable for the wider occasion of input voltage range.
The input voltage range of some particular power source has several times of even differences of tens times, can only adopt the start-up circuit scheme of voltage stabilizing didoe and MOSFET combination this moment.In order to guarantee that power supply can normally start when the minimum input voltage, the startup current-limiting resistance that this requires and MOSFET connects can not be excessive, and this can not go wrong when circuit works.If when circuit breaks down, power supply internal feedback winding or coupling coil lost efficacy, start-up circuit will continuous firing, if be the maximum input voltage state this moment, when the power consumption of start-up circuit will reach minimum input voltage dozens or even hundreds of times more than, if there is no other safeguard procedures, just need by the highest power consumption design of Reducing Rating, this just will cause the volume of start-up circuit and power consumption much larger than power supply itself, and this is obviously unrealistic and irrational.
Summary of the invention
In order to solve the problems of the prior art, the invention provides a kind of starting protection circuit that is applicable to wide range input voltage.
the invention provides a kind of starting protection circuit that is applicable to wide range input voltage, comprise voltage stabilizing didoe, electric capacity, supply module, the current limliting unit, switch module, charging diode, described supply module is connected with described voltage stabilizing didoe, and give described voltage stabilizing didoe power supply, described voltage stabilizing didoe is controlled the conducting of described switch module, described current limliting unit is in parallel with described supply module, described current limliting unit, described switch module, described charging diode, described electric capacity is connected successively, this starting protection circuit also comprises the described current limliting cell temperature of detection or described switch module temperature, and control the detection control module of described switch module running status according to the temperature that detects.
As a further improvement on the present invention, described supply module is the first Resistor Array Projector.
As a further improvement on the present invention, described current limliting unit is the second Resistor Array Projector.
As a further improvement on the present invention, described switch module is switching tube.
As a further improvement on the present invention, described detection control module comprises temperature switch, and when described the second Resistor Array Projector temperature that detects or described switching tube temperature surpassed set point, the described switching tube of described temperature switch short circuit drove pin.
As a further improvement on the present invention, described temperature switch detects described the second Resistor Array Projector temperature and described switching tube temperature simultaneously.
The invention has the beneficial effects as follows: the present invention at wide voltage input field should can effectively protect fast start-up circuit during the circuit power fault; do not affect again the self-recovering function of power supply itself; avoided the huge hot Redundancy Design of start-up circuit; Project Realization is simple, cost is low, has higher commercial value.
Description of drawings
Fig. 1 is theory diagram of the present invention.
Embodiment
as shown in Figure 1, the invention discloses a kind of starting protection circuit that is applicable to wide range input voltage, comprise voltage stabilizing didoe ZD, capacitor C, supply module, the current limliting unit, switch module, charging diode D, described supply module is connected with described voltage stabilizing didoe ZD, and give described voltage stabilizing didoe ZD power supply, described voltage stabilizing didoe ZD controls the conducting of described switch module, described current limliting unit is in parallel with described supply module, described current limliting unit, described switch module, described charging diode D, described capacitor C is connected successively, this starting protection circuit also comprises the described current limliting cell temperature of detection or described switch module temperature, and control the detection control module of described switch module running status according to the temperature that detects.
Described supply module is the first Resistor Array Projector 1, and described current limliting unit is the second Resistor Array Projector 2.Described switch module is switching tube Q.
Described detection control module comprises temperature switch SW, and when described the second Resistor Array Projector 2 temperature that detect or described switching tube Q temperature surpassed set point, the described switching tube Q of described temperature switch SW short circuit drove pin.Described temperature switch SW detects described the second Resistor Array Projector 2 temperature and described switching tube Q temperature simultaneously.
during work, after powering on, input voltage gives voltage stabilizing didoe ZD power supply by the first Resistor Array Projector 1, make switching tube Q drive the voltage stabilizing value that pin reaches voltage stabilizing didoe ZD, under initial condition, capacitor C voltage is zero, the voltage of voltage stabilizing didoe ZD is greater than the cut-in voltage of switching tube Q, switching tube Q conducting, input voltage is by the second Resistor Array Projector 2, switching tube Q, D charges to capacitor C with charging diode, charge to power initiation after power-on voltage, feedback winding or the coupling coil of power supply inside are powered to capacitor C afterwards, make the voltage difference of the voltage of voltage stabilizing didoe D and capacitor C less than the shutoff voltage of switching tube Q, switching tube Q turn-offs, start-up circuit is deactivated.
If when power supply is inputted at high voltage, fault causes feedback winding or coupling coil not to power to capacitor C; start-up circuit continues startup and can cause the second Resistor Array Projector 2 and switching tube Q to generate heat rapidly; temperature by temperature switch SW or similar units test the second Resistor Array Projector 2 and switching tube Q; when surpassing set point, short switch pipe Q drives pin; avoided the continuous firing of start-up circuit; and set larger stagnant ring value and can protect rapidly when the fault guaranteeing, power supply can recover self-starting function again after trouble shooting.
From the above; should can effectively protect fast start-up circuit during the circuit power fault, do not affect again the self-recovering function of power supply itself at wide voltage input field, avoided the huge hot Redundancy Design of start-up circuit; Project Realization is simple, cost is low, has higher commercial value.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (6)
1. starting protection circuit that is applicable to wide range input voltage, it is characterized in that: comprise voltage stabilizing didoe (ZD), electric capacity (C), supply module, the current limliting unit, switch module, charging diode (D), described supply module is connected with described voltage stabilizing didoe (ZD), and give described voltage stabilizing didoe (ZD) power supply, described voltage stabilizing didoe (ZD) is controlled the conducting of described switch module, described current limliting unit is in parallel with described supply module, described current limliting unit, described switch module, described charging diode (D), described electric capacity (C) is connected successively, this starting protection circuit also comprises the described current limliting cell temperature of detection or described switch module temperature, and control the detection control module of described switch module running status according to the temperature that detects.
2. starting protection circuit according to claim 1, it is characterized in that: described supply module is the first Resistor Array Projector (1).
3. starting protection circuit according to claim 2 is characterized in that: described current limliting unit is the second Resistor Array Projector (2).
4. starting protection circuit according to claim 3, it is characterized in that: described switch module is switching tube (Q).
5. the described starting protection circuit of according to claim 1 to 4 any one; it is characterized in that: described detection control module comprises temperature switch (SW); when described the second Resistor Array Projector (2) temperature that detects or described switching tube (Q) temperature surpassed set point, the described switching tube of described temperature switch (SW) short circuit (Q) drove pin.
6. starting protection circuit according to claim 5, it is characterized in that: described temperature switch (SW) detects described the second Resistor Array Projector (2) temperature and described switching tube (Q) temperature simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100941886A CN103151911A (en) | 2013-03-22 | 2013-03-22 | Starting protection circuit suitable for wide voltage input range |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100941886A CN103151911A (en) | 2013-03-22 | 2013-03-22 | Starting protection circuit suitable for wide voltage input range |
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| Publication Number | Publication Date |
|---|---|
| CN103151911A true CN103151911A (en) | 2013-06-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013100941886A Pending CN103151911A (en) | 2013-03-22 | 2013-03-22 | Starting protection circuit suitable for wide voltage input range |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106411134A (en) * | 2015-07-30 | 2017-02-15 | 罗姆股份有限公司 | DC/DC converter, power supply device, power adapter and electronic device |
| CN109728631A (en) * | 2019-01-31 | 2019-05-07 | 维沃移动通信有限公司 | A kind of charging circuit and electronic equipment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130596A (en) * | 2011-01-27 | 2011-07-20 | 广州金升阳科技有限公司 | Switching converter with wide input voltage range |
| CN102158067A (en) * | 2011-04-20 | 2011-08-17 | 广州金升阳科技有限公司 | Starting circuit for switching power supply |
| CN102195462A (en) * | 2011-05-26 | 2011-09-21 | 广州金升阳科技有限公司 | Start-up circuit with high-tension power supply |
| CN103023297A (en) * | 2012-12-28 | 2013-04-03 | 深圳市航天新源科技有限公司 | Starting protective circuit suitable for wide voltage input range |
-
2013
- 2013-03-22 CN CN2013100941886A patent/CN103151911A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130596A (en) * | 2011-01-27 | 2011-07-20 | 广州金升阳科技有限公司 | Switching converter with wide input voltage range |
| CN102158067A (en) * | 2011-04-20 | 2011-08-17 | 广州金升阳科技有限公司 | Starting circuit for switching power supply |
| CN102195462A (en) * | 2011-05-26 | 2011-09-21 | 广州金升阳科技有限公司 | Start-up circuit with high-tension power supply |
| CN103023297A (en) * | 2012-12-28 | 2013-04-03 | 深圳市航天新源科技有限公司 | Starting protective circuit suitable for wide voltage input range |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106411134A (en) * | 2015-07-30 | 2017-02-15 | 罗姆股份有限公司 | DC/DC converter, power supply device, power adapter and electronic device |
| CN109728631A (en) * | 2019-01-31 | 2019-05-07 | 维沃移动通信有限公司 | A kind of charging circuit and electronic equipment |
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Application publication date: 20130612 |