CN219247685U - Heavy load compensation and short-circuit protection circuit for switching power supply - Google Patents
Heavy load compensation and short-circuit protection circuit for switching power supply Download PDFInfo
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- CN219247685U CN219247685U CN202221400141.9U CN202221400141U CN219247685U CN 219247685 U CN219247685 U CN 219247685U CN 202221400141 U CN202221400141 U CN 202221400141U CN 219247685 U CN219247685 U CN 219247685U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model relates to the technical field of switching power supply circuits, in particular to a heavy load compensation and short-circuit protection circuit of a switching power supply, which comprises a starting resistor, a voltage stabilizing diode, a transformer, a first rectifying diode, a switching control circuit, an energy storage circuit and a detection circuit, wherein one end of the starting resistor is connected with an external power supply, the other end of the starting resistor is connected with the negative end of the voltage stabilizing diode, the positive end of the voltage stabilizing diode is grounded, the external power supply is connected with the input side end of the transformer, the switching control circuit is arranged between the starting resistor and the input side end of the transformer, the energy storage circuit is arranged between the starting resistor and the input side end of the transformer, the detection circuit is arranged between the input side end and the output side end of the transformer, the positive end of the first rectifying diode is connected with the output side of the transformer, the negative end of the first rectifying diode outputs a working power supply, and the input voltage of the switching power supply can be 24V-96V, the output voltage is 15V, and the maximum current output is 150MA, and the switching power supply is suitable for most direct current low-voltage conversion requirements.
Description
Technical Field
The utility model relates to the technical field of switching power supply circuits, in particular to a heavy load compensation and short-circuit protection circuit of a switching power supply.
Background
In the electric control system industry, the use of direct current low voltage switching power supply is related to, and when external demand load suddenly increases, output power supply 15V can be pulled down in the twinkling of an eye, leads to the circuit work at the back abnormal, and when the power is in full load operating condition always, whole power device can continuously generate heat, influences power device life.
Disclosure of Invention
Aiming at the defects existing in the prior art, the utility model aims to provide a heavy load compensation and short-circuit protection circuit of a switching power supply.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the utility model provides a switching power supply heavy load compensation and short-circuit protection circuit, includes starting resistor, zener diode, transformer, rectifier diode one, switch control circuit, energy storage circuit and detection circuitry, external power source is connected to starting resistor one end, and the negative pole end of zener diode is connected to the other end, and the positive pole ground connection of zener diode, the input side of transformer is connected to external power source, switch control circuit sets up between starting resistor and the input side of transformer, energy storage circuit sets up between starting resistor and the input side of transformer, detection circuitry sets up between the input side of transformer and output side, the positive pole of rectifier diode one is connected on the output side of transformer, and the negative pole of rectifier diode one exports working power supply.
Preferably, the switch control circuit comprises a resistor I, a resistor II, a diode I, a triode I, an inductor and a capacitor I, wherein the cathode end of the voltage stabilizing diode is respectively connected with one end of the resistor I and the base electrode of the triode I, the other end of the resistor I is connected with the cathode end of the diode I, the anode end of the diode I is respectively connected with the emitting electrode of the triode and the cathode end of the rectifier diode I, the collector electrode of the triode I is connected with the input end side of the transformer, and the base electrode of the triode I is sequentially connected with the resistor II, the capacitor I and the inductor in series and then is connected with the cathode end of the rectifier diode I.
Preferably, the energy storage circuit comprises a protection resistor, a second capacitor and a second diode, one end of the protection resistor is connected with one end of the input end side of the transformer, the other end of the protection resistor is connected with the negative end of the second diode, the positive end of the second diode is connected with the other end of the input end side of the transformer, and the second capacitor is connected in parallel with the protection resistor.
Preferably, the detection circuit comprises a triode II, a resistor III, a resistor IV and a capacitor III, wherein one end of the resistor III is connected with a connection point of the diode I and the rectifier diode I, the other end of the resistor III is used for outputting a working power supply and is connected with an emitter of the triode II, a collector of the triode II is connected with a cathode end of the voltage-stabilizing diode, a base of the triode II is respectively connected with one end of the capacitor III and one end of the resistor IV, the other end of the capacitor III is connected with an emitter of the triode, and the other end of the resistor IV is connected with a cathode end of the rectifier diode I.
Preferably, the connecting end of the starting resistor and the external power supply is connected with a rectifier diode II, a capacitor IV and a current limiting resistor in series, the external power supply is connected with the starting resistor after being connected with the rectifier diode II and the current limiting resistor in series, one end of the capacitor IV is connected with the starting resistor, and the other end of the capacitor IV is grounded.
Preferably, one end of the third resistor for outputting the working power supply is connected with a fifth capacitor and a sixth capacitor, and the fifth capacitor and the sixth capacitor are connected in parallel and then connected with the third resistor.
Compared with the prior art, the utility model has the beneficial effects that: the input voltage can be 24V-96V, the output voltage is 15V, the maximum current output is 150MA, and the DC low-voltage conversion device is suitable for most of DC low-voltage conversion requirements;
1) When the current detection resistor and the triode circuit are added, and the output current suddenly increases to a certain value, the triode is conducted through the voltage rise at the two ends of the detection resistor to provide current for an output load, so that the phenomenon that the output 15V voltage is pulled down to cause abnormal operation of a later circuit is avoided.
2) When short circuit occurs outside the output 15V, the power triode can be turned off through the current detection resistor, so that the damage of circuit components is protected.
Drawings
Fig. 1 is a schematic circuit diagram of the present utility model.
In the figure: 1. starting a resistor; 2. a zener diode; 3. a transformer; 4. a rectifier diode I; 6. a resistor I; 7. a resistor II; 8. a first diode; 9. a triode I; 10. an inductance; 11. a first capacitor; 12. a protection resistor; 13. a second capacitor; 14. a second diode; 15. a triode II; 16. a third resistor; 17. a resistor IV; 18. a third capacitor; 19. a rectifier diode II; 20. a fourth capacitor; 21. a current limiting resistor; 22. a fifth capacitor; 23. and a capacitor six.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1, the present utility model provides a technical solution: the utility model provides a switching power supply heavy load compensation and short-circuit protection circuit, includes starting resistor, zener diode, transformer, rectifier diode one, switch control circuit, energy storage circuit and detection circuitry, external power source is connected to starting resistor one end, and the negative pole end of zener diode is connected to the other end, and the positive pole ground connection of zener diode, the input side of transformer is connected to external power source, switch control circuit sets up between starting resistor and the input side of transformer, energy storage circuit sets up between starting resistor and the input side of transformer, detection circuitry sets up between the input side of transformer and output side, the positive pole of rectifier diode one is connected on the output side of transformer, and the negative pole of rectifier diode one exports working power supply.
The switch control circuit comprises a resistor I, a resistor II, a diode I, a triode I, an inductor and a capacitor I, wherein the cathode end of the voltage stabilizing diode is respectively connected with one end of the resistor I and the base electrode of the triode I, the other end of the resistor I is connected with the cathode end of the diode I, the anode end of the diode I is respectively connected with the emitting electrode of the triode and the cathode end of the rectifier diode I, the collector electrode of the triode I is connected with the input end side of the transformer, and the base electrode of the triode I is sequentially connected with the resistor II, the capacitor I and the inductor in series and then is connected with the cathode end of the rectifier diode I.
In this application, in order to reduce the use of components and parts, use the coil of transformer wherein one side as inductance for the condition of use of components and parts has been reduced, the cost is reduced.
The energy storage circuit comprises a protection resistor, a second capacitor and a second diode, one end of the protection resistor is connected with one end of the input end side of the transformer, the other end of the protection resistor is connected with the negative end of the second diode, the positive end of the second diode is connected with the other end of the input end side of the transformer, and the second capacitor is connected in parallel with the protection resistor.
The detection circuit comprises a triode II, a resistor III, a resistor IV and a capacitor III, wherein one end of the resistor III is connected with a connection point of the diode I and the rectifier diode I, the other end of the resistor III is used for outputting a working power supply and is connected with an emitter of the triode II, a collector of the triode II is connected with a cathode end of the voltage-stabilizing diode, a base of the triode II is respectively connected with one end of the capacitor III and one end of the resistor IV, the other end of the capacitor III is connected with an emitter of the triode, and the other end of the resistor IV is connected with a cathode end of the rectifier diode I.
The connecting end of the starting resistor and the external power supply is connected with a rectifier diode II, a capacitor IV and a current limiting resistor in series, the external power supply is connected with the starting resistor after being connected with the rectifier diode II and the current limiting resistor in series, one end of the capacitor IV is connected with the starting resistor, and the other end of the capacitor IV is grounded. The fourth capacitor is an electrolytic capacitor, the positive electrode end of the fourth capacitor is connected with a starting resistor, and the negative electrode end of the fourth capacitor is grounded.
The capacitor five and the capacitor six are connected in parallel and then connected with the resistor three, the capacitor five is a ceramic capacitor, and the capacitor six is an electrolytic capacitor.
By the technical proposal of the utility model,
1) When the input voltage is supplied, the second rectifying diode is isolated, then the input voltage is stabilized at about 15V through the current limiting and filtering of the current limiting resistor and the capacitor IV and the starting resistor and the voltage stabilizing diode,
2) The voltage of the stable point of the voltage stabilizing diode forms a loop through the resistor II, the capacitor I and the coils of the transformers 3 and 4, the triode I can be conducted until the voltage rises, so that the coils of the transformers 1 and 2 are conducted to store energy, when the triode I is turned off, the coils of the transformers 1 and 2 couple the stored energy to the secondary coil, the energy coupled by the coils of the transformers 5 and 6 is rectified into 15V voltage through the rectifier diode I to be supplied to a load, and meanwhile, the energy is provided through the diode I and the resistor I, so that the triode I is continuously operated in a switch with a certain frequency.
3) When the triode I is turned off, the protection resistor, the capacitor II and the diode II form an RDC energy absorption loop;
4) When the external load is increased to a certain value, the voltage at the two ends of the resistor is increased to be larger than the B, E pole conduction voltage of the triode II, and the triode II is conducted to compensate the load, so that the phenomenon that the 15V voltage output instantly is pulled down to influence the work of a circuit at the back is avoided.
5) When the external short circuit occurs, the voltage at the three ends of the overcurrent detection resistor can enable the first power triode to be turned off and stop working, so that the power components of the circuit are protected from being damaged due to overlarge current.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A switching power supply heavy load compensation and short-circuit protection circuit is characterized in that: the power supply comprises a starting resistor, a voltage stabilizing diode, a transformer, a first rectifying diode, a switch control circuit, an energy storage circuit and a detection circuit, wherein one end of the starting resistor is connected with an external power supply, the other end of the starting resistor is connected with the negative end of the voltage stabilizing diode, the positive end of the voltage stabilizing diode is grounded, the external power supply is connected with the input side end of the transformer, the switch control circuit is arranged between the starting resistor and the input side end of the transformer, the energy storage circuit is arranged between the starting resistor and the input side end of the transformer, the detection circuit is arranged between the input side end and the output side end of the transformer, the positive end of the first rectifying diode is connected with the output side of the transformer, and the negative end of the first rectifying diode outputs a working power supply.
2. The switching power supply heavy load compensation and short-circuit protection circuit according to claim 1, wherein: the switch control circuit comprises a resistor I, a resistor II, a diode I, a triode I, an inductor and a capacitor I, wherein the cathode end of the voltage stabilizing diode is respectively connected with one end of the resistor I and the base electrode of the triode I, the other end of the resistor I is connected with the cathode end of the diode I, the anode end of the diode I is respectively connected with the emitting electrode of the triode and the cathode end of the rectifier diode I, the collector electrode of the triode I is connected with the input end side of the transformer, and the base electrode of the triode I is sequentially connected with the resistor II, the capacitor I and the inductor in series and then is connected with the cathode end of the rectifier diode I.
3. The switching power supply heavy load compensation and short circuit protection circuit according to claim 2, wherein: the energy storage circuit comprises a protection resistor, a second capacitor and a second diode, one end of the protection resistor is connected with one end of the input end side of the transformer, the other end of the protection resistor is connected with the negative end of the second diode, the positive end of the second diode is connected with the other end of the input end side of the transformer, and the second capacitor is connected in parallel with the protection resistor.
4. The switching power supply heavy load compensation and short-circuit protection circuit according to claim 1, wherein: the detection circuit comprises a triode II, a resistor III, a resistor IV and a capacitor III, wherein one end of the resistor III is connected with a connection point of the diode I and the rectifier diode I, the other end of the resistor III is used for outputting a working power supply and is connected with an emitter of the triode II, a collector of the triode II is connected with a cathode end of the voltage-stabilizing diode, a base of the triode II is respectively connected with one end of the capacitor III and one end of the resistor IV, the other end of the capacitor III is connected with an emitter of the triode, and the other end of the resistor IV is connected with a cathode end of the rectifier diode I.
5. The switching power supply heavy load compensation and short-circuit protection circuit according to claim 1, wherein: the connecting end of the starting resistor and the external power supply is connected with a rectifier diode II, a capacitor IV and a current limiting resistor in series, the external power supply is connected with the starting resistor after being connected with the rectifier diode II and the current limiting resistor in series, one end of the capacitor IV is connected with the starting resistor, and the other end of the capacitor IV is grounded.
6. The switching power supply heavy load compensation and short-circuit protection circuit according to claim 4, wherein: the resistor III is used for outputting one end of the working power supply and is connected with the capacitor V and the capacitor VI, and the capacitor V and the capacitor VI are connected in parallel and then connected with the resistor III.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221400141.9U CN219247685U (en) | 2022-06-06 | 2022-06-06 | Heavy load compensation and short-circuit protection circuit for switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221400141.9U CN219247685U (en) | 2022-06-06 | 2022-06-06 | Heavy load compensation and short-circuit protection circuit for switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219247685U true CN219247685U (en) | 2023-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221400141.9U Active CN219247685U (en) | 2022-06-06 | 2022-06-06 | Heavy load compensation and short-circuit protection circuit for switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219247685U (en) |
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2022
- 2022-06-06 CN CN202221400141.9U patent/CN219247685U/en active Active
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