CN203747676U - Switching power supply - Google Patents
Switching power supply Download PDFInfo
- Publication number
- CN203747676U CN203747676U CN201320873221.0U CN201320873221U CN203747676U CN 203747676 U CN203747676 U CN 203747676U CN 201320873221 U CN201320873221 U CN 201320873221U CN 203747676 U CN203747676 U CN 203747676U
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- module
- power supply
- switching power
- output
- transformer
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Abstract
A switching power supply relates to a switching power supply with an output overload protection function. The switching power supply comprises an alternating-current input module, a first rectifier module, a transformation module with a transformer, a second rectifier module and a direct-current output module, and the modules are sequentially connected. The switching power supply further comprises a PWM switching control module used for controlling on/off of the transformer. The switching power supply further comprises an overload protection module which acquires the current value of direct current output by the direct-current output module, the overload protection module generates an overload signal and transmits the overload signal to the PWM switching control module when the acquired current value reaches a preset current threshold, and the PWM switching control module switches off the transformer when receiving the overload signal. The overload protection module is arranged to monitor the current at the direct-current output end of the switching power supply, an overload signal can be transmitted to the PWM switching control module when the current is too large, and the PWM switching control module can switch off the transformer in the first time to enable the switching power supply to stop work.
Description
Technical field
The utility model relates to a kind of Switching Power Supply, is specifically related to a kind of Switching Power Supply with output overloading defencive function.
Background technology
The output direct current of Switching Power Supply is for load, and load is short-circuited fault while causing load current excessive, not only may damage load, simultaneously because load short circuits causes switch power supply output current excessive, also may damage Switching Power Supply.
Summary of the invention
The purpose of this utility model is to provide a kind of load current can protect self not damaged Switching Power Supply when excessive.
For achieving the above object, the utility model provides following technical scheme.
A kind of Switching Power Supply, comprise interchange input module, the first rectification module, be provided with the voltage changing module of transformer, the second rectification module, direct current output module and for the PWM switch control module of the break-make of described transformer, exchange input module external AC power supply, alternating current is inputted the first rectification module via exchanging input module, the first rectification module will be transported to the transformer of voltage changing module after the AC rectification of input, the break-make of transformer described in the control of PWM switch control module generation pwm signal, described transformer connects the second rectification module, the second rectification module is by input direct-current output module from the electric energy of transformer output carries out rectification, direct current output module output direct current, described Switching Power Supply also comprises overload protection module, overload protection module gathers the galvanic current value of direct current output module output, when the current value of described collection reaches predetermined current threshold value, overload protection module produces overload signal and sends PWM switch control module to, PWM switch control module receives that described overload signal turn-offs described transformer, overload protection module comprises gate-controlled switch, boost resistor and optocoupler U1, gate-controlled switch comprises that two conduction terminal and one are for controlling the control end of the break-make between described two conduction terminal, the cathode output end of the control termination direct current output module of gate-controlled switch, boost resistor is connected between the control end of gate-controlled switch and the contact and ground of the cathode output end of direct current output module, conduction terminal external power supply of gate-controlled switch, an input of another conducting termination optocoupler U1, another input end grounding of optocoupler U1, output head grounding of optocoupler U1, another output termination PWM switch control module, the contact external power supply of optocoupler U1 and PWM switch control module.
Wherein, described Switching Power Supply also comprises the EMI filtration module from the High-frequency Interference of the alternating current of interchange input module input for filtering, and the first rectification module is connected with interchange input module via EMI filtration module.
Wherein, described Switching Power Supply also comprises the feedback module for carrying out FEEDBACK CONTROL, and feedback module input is connected in the contact of the second rectification module and direct current output module, output termination PWM switch control module.
Wherein, described gate-controlled switch is triode or metal-oxide-semiconductor.
The beneficial effects of the utility model are: the current conditions of carrying out monitoring switch power supply DC output end by overload protection module is set; in the time that one occurs the excessive situation of electric current, can send overload signal to PWM switch control module; PWM switch control module just can turn-off transformer so that Switching Power Supply quits work the very first time; thereby cut off the power supply supply to load; can do not damaged by excessive electric current by protection switch power supply, also can protect the load that occurs short trouble can further not damage.
Brief description of the drawings
Fig. 1 is the structural representation of Switching Power Supply of the present utility model.
Reference numeral comprises: overload protection module 1.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is elaborated.
As shown in Figure 1, a kind of Switching Power Supply of the present utility model, comprise interchange input module, the first rectification module, be provided with the voltage changing module of transformer, the second rectification module, direct current output module and for the PWM switch control module of the break-make of described transformer, exchange input module external AC power supply, alternating current is inputted the first rectification module via exchanging input module, the first rectification module will be transported to the transformer of voltage changing module after the AC rectification of input, the break-make of transformer described in the control of PWM switch control module generation pwm signal, described transformer connects the second rectification module, the second rectification module is by input direct-current output module from the electric energy of transformer output carries out rectification, direct current output module output direct current, described Switching Power Supply also comprises overload protection module 1, overload protection module 1 gathers the galvanic current value of direct current output module output, when the current value of described collection reaches predetermined current threshold value, 1 of overload protection module produces overload signal and sends PWM switch control module to, PWM switch control module receives that described overload signal turn-offs described transformer.Switching Power Supply of the present utility model also comprises for filtering from the EMI filtration module of the High-frequency Interference of the alternating current of interchange input module input with for carrying out the feedback module of FEEDBACK CONTROL, the first rectification module is connected with interchange input module via EMI filtration module, feedback module input is connected in the contact of the second rectification module and direct current output module, output termination PWM switch control module.By being set, overload protection module 1 carrys out the current conditions of monitoring switch power supply DC output end; in the time that one occurs the excessive situation of electric current, can send overload signal to PWM switch control module; PWM switch control module just can turn-off transformer so that Switching Power Supply quits work the very first time; thereby cut off the power supply supply to load; can do not damaged by excessive electric current by protection switch power supply, also can protect the load that occurs short trouble can further not damage.
As shown in Figure 1, overload protection module 1 comprises triode Q1, boost resistor R1 and optocoupler U1, the base stage of triode Q1 connects the cathode output end of direct current output module, boost resistor R1 is connected between the base stage of triode Q1 and the contact and ground of the cathode output end of direct current output module, the collector electrode external power supply of triode Q1, in the present embodiment, as shown in Figure 1, the collector electrode of triode Q1 connects the cathode output end of direct current output module, the emitter of triode Q1 connects an input of optocoupler U1, another input end grounding of optocoupler U1, output head grounding of optocoupler U1, another output termination PWM switch control module, the contact external power supply of optocoupler U1 and PWM switch control module.The electric current of the cathode output end of direct current output module can be flowed through after boost resistor to ground, in boost resistor R1, there is electric current to flow through, will form at boost resistor R1 two ends electrical potential difference, due to boost resistor R1 one end ground connection, this end electromotive force is zero, therefore the other end of boost resistor R1, the electromotive force size of the one end being connected with the base stage of triode Q1 is the electrical potential difference size at boost resistor R1 two ends, that is to say that the base stage level of triode Q1 equals the electrical potential difference at boost resistor R1 two ends, the electrical potential difference at boost resistor R1 two ends reflects the size of current that flows through boost resistor R1, the size of current that flows through boost resistor R1 can reflect again the size of current of direct current output module output, it is the size of load current, therefore, just can set described predetermined current threshold value by the resistance of selecting boost resistor R1, once load current reaches predetermined current threshold value, the electrical potential difference size at boost resistor R1 two ends is that the base stage level of triode Q1 is just enough to make triode Q1 conducting, triode Q1 conducting can be connected two inputs of optocoupler U1, thereby make two output conductings of optocoupler U1, overload protection module 1 just can be inputted the level of a saltus step to PWM switch control module, this saltus step level is overload signal, PWM switch control module just turn-offs described transformer after receiving this saltus step level, turn-off whole Switching Power Supply with this.
Finally should be noted that; above embodiment is only in order to illustrate the technical solution of the utility model; but not restriction to the utility model protection range; although the utility model has been done to explain with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify or be equal to replacement the technical solution of the utility model, and not depart from essence and the scope of technical solutions of the utility model.
Claims (4)
1. a Switching Power Supply, comprise interchange input module, the first rectification module, be provided with the voltage changing module of transformer, the second rectification module, direct current output module and for the PWM switch control module of the break-make of described transformer, exchange input module external AC power supply, alternating current is inputted the first rectification module via exchanging input module, the first rectification module will be transported to the transformer of voltage changing module after the AC rectification of input, the break-make of transformer described in the control of PWM switch control module generation pwm signal, described transformer connects the second rectification module, the second rectification module is by input direct-current output module from the electric energy of transformer output carries out rectification, direct current output module output direct current, it is characterized in that: described Switching Power Supply also comprises overload protection module, overload protection module gathers the galvanic current value of direct current output module output, when the current value of described collection reaches predetermined current threshold value, overload protection module produces overload signal and sends PWM switch control module to, PWM switch control module receives that described overload signal turn-offs described transformer, overload protection module comprises gate-controlled switch, boost resistor and optocoupler U1, gate-controlled switch comprises that two conduction terminal and one are for controlling the control end of the break-make between described two conduction terminal, the cathode output end of the control termination direct current output module of gate-controlled switch, boost resistor is connected between the control end of gate-controlled switch and the contact and ground of the cathode output end of direct current output module, conduction terminal external power supply of gate-controlled switch, an input of another conducting termination optocoupler U1, another input end grounding of optocoupler U1, output head grounding of optocoupler U1, another output termination PWM switch control module, the contact external power supply of optocoupler U1 and PWM switch control module.
2. a kind of Switching Power Supply according to claim 1, it is characterized in that: described Switching Power Supply also comprises the EMI filtration module from the High-frequency Interference of the alternating current of interchange input module input for filtering, and the first rectification module is connected with interchange input module via EMI filtration module.
3. a kind of Switching Power Supply according to claim 1, it is characterized in that: described Switching Power Supply also comprises the feedback module for carrying out FEEDBACK CONTROL, feedback module input is connected in the contact of the second rectification module and direct current output module, output termination PWM switch control module.
4. a kind of Switching Power Supply according to claim 1, is characterized in that: described gate-controlled switch is triode or metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320873221.0U CN203747676U (en) | 2013-12-28 | 2013-12-28 | Switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320873221.0U CN203747676U (en) | 2013-12-28 | 2013-12-28 | Switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203747676U true CN203747676U (en) | 2014-07-30 |
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ID=51347429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320873221.0U Expired - Fee Related CN203747676U (en) | 2013-12-28 | 2013-12-28 | Switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203747676U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113972622A (en) * | 2021-10-25 | 2022-01-25 | 上海电气泰雷兹交通自动化系统有限公司 | Automatic circuit overload or short circuit protection device |
-
2013
- 2013-12-28 CN CN201320873221.0U patent/CN203747676U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113972622A (en) * | 2021-10-25 | 2022-01-25 | 上海电气泰雷兹交通自动化系统有限公司 | Automatic circuit overload or short circuit protection device |
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Legal Events
| 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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140730 Termination date: 20181228 |