CN219779976U - Power supply switching circuit - Google Patents
Power supply switching circuit Download PDFInfo
- Publication number
- CN219779976U CN219779976U CN202320219563.4U CN202320219563U CN219779976U CN 219779976 U CN219779976 U CN 219779976U CN 202320219563 U CN202320219563 U CN 202320219563U CN 219779976 U CN219779976 U CN 219779976U
- Authority
- CN
- China
- Prior art keywords
- capacitor
- resistor
- switching circuit
- output end
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 121
- 230000001105 regulatory effect Effects 0.000 claims abstract description 21
- 238000001914 filtration Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model provides a power supply switching circuit, which comprises: the DC input socket J1, the switch MOS tube U1, the resistor R1, the power switch S1, the resistor R2, the resistor R3, the DC-DC voltage regulating chip U2, the capacitor C5, the inductor L1, the resistor R4, the resistor R5, the capacitor C6 and the power output end Vout; according to the utility model, the functions of replacing elements bearing different current specifications and adjusting voltage according to the current requirements of a later-stage power supply circuit are realized by adding the elements such as the switch MOS tube U1 and the DC-DC voltage-adjusting chip U2, and the problem that the current is limited by a switch is solved.
Description
Technical Field
The utility model relates to the technical field of power supply, in particular to a power supply switching circuit.
Background
Existing router products provide internet service, require long-term uninterrupted operation, and when not used for a long time, require power off of the product, so the product requires additional switches to turn off the power. Referring to fig. 1, the components of the power supply switching circuit in the prior art include a DC power input interface J1, a polar capacitor CE3, a nonpolar capacitor C9, a power switch S3 and a power output terminal 12v_out, where the power switch S3 in the circuit needs to withstand a current passing through more than 1A, but not every switch in the market can withstand a large current exceeding more than 1A, and when the switch cannot meet the requirement of current passing through, the design of the switching circuit cannot meet the requirement of a product, so that the selection of the switch is limited. Therefore, the current born by the switch is limited in the prior art, and the working reliability is low.
To sum up, there is a need in the industry to improve the existing power supply switch circuit, and solve the problem that the current born by the switch is limited to cause the limitation of the selection of the switch, and the working reliability is low.
Disclosure of Invention
To overcome the problems in the related art, the present disclosure provides a power supply switching circuit, the switching circuit comprising; the power supply comprises a DC input socket J1, a switch MOS tube U1, a resistor R1, a power switch S1, a resistor R2, a resistor R3, a DC-DC voltage regulating chip U2, a capacitor C5, an inductor L1, a resistor R4, a resistor R5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9 and a power supply output end Vout;
the positive electrode output end of the DC input socket J1 is connected with the source electrode of the switch MOS tube U1, and the negative electrode output end of the DC input socket J1 is grounded;
the source electrode of the switch MOS tube U1 is connected with one end of the resistor R1, the grid electrode of the switch MOS tube U1 and the other end of the resistor R1 are connected with the input end of the power switch S1, the output end of the power switch S1 is connected with one end of the resistor R2, and the other end of the resistor R2 is grounded; the drain electrode of the switch MOS tube U1 is connected with the VIN pin of the DC-DC voltage regulating chip U2, the resistor R3 is connected between the VIN pin and the EN pin of the DC-DC voltage regulating chip U2, the BOOT pin of the DC-DC voltage regulating chip U2 is connected with one end of the capacitor C5, the LX pin of the capacitor C5 and the DC-DC voltage regulating chip U2 is connected with one end of the inductor L1, the other end of the inductor L1 is connected with the power output end Vout, the FB pin of the DC-DC voltage regulating chip U2 is connected with one end of the capacitor C6, the other end of the capacitor C6 is connected with the power output end Vout, the power output end Vout is connected with one ends of the capacitor C7, the capacitor C8 and the capacitor C9, and the other ends of the capacitor C7, the capacitor C8 and the capacitor C9 are respectively grounded;
the resistor R4 is connected with the capacitor C6 in parallel, one end of the resistor R5 is connected with the resistor R4, and the other end of the resistor R5 is grounded.
Optionally, the switching circuit further includes: a diode D1; the negative pole output end of the DC input socket J1 is connected with the positive pole of the diode D1, and the positive pole output end of the DC input socket J1 is connected with the negative pole of the diode D1.
Optionally, the switching circuit further includes: a surge protection tube TVS1; the negative electrode output end of the DC input socket J1 is connected with one end of the surge protection tube TVS1, and the positive electrode output end of the DC input socket J1 is connected with the other end of the surge protection tube TVS 1.
Optionally, the switching circuit further includes: a polar capacitance CE1; the negative electrode output end of the DC input socket J1 is connected with the negative electrode of the polar capacitor CE1, and the positive electrode output end of the DC input socket J1 is connected with the positive electrode of the polar capacitor CE 1.
Optionally, the switching circuit further includes: a capacitor C1; the negative electrode output end of the DC input socket J1 is connected with one end of the capacitor C1, and the positive electrode output end of the DC input socket J1 is connected with the other end of the capacitor C1.
Optionally, the switching circuit further includes: a capacitor C2; one end of the capacitor C2 is connected with the grid electrode of the switch MOS tube U1, and the other end of the capacitor C2 is grounded.
Optionally, the switching circuit further includes: a capacitor C3 and a capacitor C4; the drain electrode of the switch MOS tube U1 is connected with one ends of the capacitor C3 and the capacitor C4, and the other ends of the capacitor C3 and the capacitor C4 are respectively grounded.
In summary, the present utility model provides a power supply switching circuit, which includes: the power supply comprises a DC input socket J1, a switch MOS tube U1, a resistor R1, a power switch S1, a resistor R2, a resistor R3, a DC-DC voltage regulating chip U2, a capacitor C5, an inductor L1, a resistor R4, a resistor R5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9 and a power supply output end Vout; the DC input socket J1 is used for carrying out 12V voltage direct current power supply, the resistor R1 is a bias resistor of the grid electrode of the switch MOS tube U1, when the power switch S1 is in a disconnected state, the grid electrode of the switch MOS tube U1 is directly connected to 12V through the resistor R1, at the moment, the source electrode and the grid electrode of the switch MOS tube U1 have no voltage difference, the source electrode of the switch MOS tube U1 and the drain electrode of the switch MOS tube U1 are not conducted, and voltage cannot be output to the rear stage. When the power switch S1 is closed, the power switch S1 is conducted, the resistor R2 is grounded, the resistor R1 and the resistor R2 are used for dividing voltage, the grid voltage of the switch MOS tube U1 is lower than 12V, the grid voltage of the switch MOS tube U1 is lower than the source voltage of the switch MOS tube U1 by 2.5V according to the setting of the resistance value, and the source electrode of the switch MOS tube U1 and the drain electrode of the switch MOS tube U1 are conducted to output voltage to the rear stage. According to the utility model, the functions of replacing elements bearing different current specifications and adjusting voltage according to the current requirements of a later-stage power supply circuit are realized by adding the elements such as the switch MOS tube U1 and the DC-DC voltage-adjusting chip U2, and the problem that the current is limited by a switch is solved.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
For a clearer description of embodiments of the utility model or of solutions in the prior art, the drawings which are used in the description of the embodiments or of the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a conventional power supply switching circuit;
fig. 2 is a schematic circuit diagram of a power supply switching circuit according to the present utility model.
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 fall within the scope of the utility model.
Referring to fig. 2, a schematic circuit diagram of a power supply switching circuit is shown for an exemplary embodiment of the present utility model, the switching circuit comprising; the power supply comprises a DC input socket J1, a switch MOS tube U1, a resistor R1, a power switch S1, a resistor R2, a resistor R3, a DC-DC voltage regulating chip U2, a capacitor C5, an inductor L1, a resistor R4, a resistor R5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9 and a power supply output end Vout;
the positive output end of the DC input socket J1 is connected with the source electrode of the switch MOS tube U1, and the negative output end of the DC input socket J1 is grounded;
the source electrode of the switch MOS tube U1 is connected with one end of a resistor R1, the grid electrode of the switch MOS tube U1 and the other end of the resistor R1 are connected with the input end of a power switch S1, the output end of the power switch S1 is connected with one end of a resistor R2, and the other end of the resistor R2 is grounded; the drain electrode of the switch MOS tube U1 is connected with the VIN pin of the DC-DC voltage regulating chip U2, the resistor R3 is connected between the VIN pin and the EN pin of the DC-DC voltage regulating chip U2, the BOOT pin of the DC-DC voltage regulating chip U2 is connected with one end of the capacitor C5, the LX pin of the capacitor C5 and the DC-DC voltage regulating chip U2 is connected with one end of the inductor L1, the other end of the inductor L1 is connected with the power output end Vout, the FB pin of the DC-DC voltage regulating chip U2 is connected with one end of the capacitor C6, the other end of the capacitor C6 is connected with the power output end Vout, the power output end Vout is connected with one ends of the capacitor C7, the capacitor C8 and the capacitor C9, and the other ends of the capacitor C7, the capacitor C8 and the capacitor C9 are respectively grounded;
the resistor R4 is connected in parallel with the capacitor C6, one end of the resistor R5 is connected with the resistor R4, and the other end of the resistor R5 is grounded.
For example, the DC input socket J1 performs 12V DC power supply, the resistor R1 is a bias resistor of the gate of the switch MOS tube U1, when the power switch S1 is turned off, the gate of the switch MOS tube U1 is directly connected to 12V through the resistor R1, at this time, the source and the gate of the switch MOS tube U1 have no voltage difference, and the source of the switch MOS tube U1 and the drain of the switch MOS tube U1 are not turned on, so that no voltage is output to the subsequent stage. When the power switch S1 is closed, the power switch S1 is conducted, the resistor R2 is grounded, the resistor R1 and the resistor R2 are used for dividing voltage, the grid voltage of the switch MOS tube U1 is lower than 12V, the grid voltage of the switch MOS tube U1 is lower than the source voltage of the switch MOS tube U1 by 2.5V according to the setting of the resistance value, and the source electrode of the switch MOS tube U1 and the drain electrode of the switch MOS tube U1 are conducted to output voltage to the rear stage. The function of replacing elements bearing different current specifications according to the current requirements of a later-stage power supply circuit is realized through the switch MOS tube U1. The function of providing adjustable output voltage is realized by adding elements such as a DC-DC voltage regulating chip U2, a resistor R4, a resistor R5 and the like; the capacitor C5 is added to provide a more stable power supply, and meanwhile, noise of the element coupled to a power supply terminal can be reduced; the capacitor C6 is added to adjust the dynamic response of the output, so that the response speed of the power supply is improved; the capacitor C7, the capacitor C8 and the capacitor C9 have the functions of filtering and stabilizing voltage, and the capacitance value of the capacitor C7 and the capacitor C8 is 22 mu F, and the capacitance value of the capacitor C9 is 0.1 mu F, so that the filtering frequency range is widened.
Specifically, the switching circuit further includes: a diode D1; the negative output end of the DC input socket J1 is connected with the positive electrode of the diode D1, and the positive output end of the DC input socket J1 is connected with the negative electrode of the diode D1.
Illustratively, the diode D1 is a protection diode for preventing reverse power supply polarity, and the diode D1 is not conductive and does not play any role when the normal DC input socket J1 inputs forward voltage. When the polarity of the input voltage is reversed and the input voltage of the pin of the DC socket 2 is reversed, the diode D1 conducts current, so that the cathode of the diode D1 flows to the anode, the power supply can not supply power to the rear stage, the effect of protecting the rear stage circuit is achieved, and the damage to the rear stage circuit can not be caused.
The switching circuit further includes: a surge protection tube TVS1; the negative electrode output end of the DC input socket J1 is connected with one end of the surge protection tube TVS1, and the positive electrode output end of the DC input socket J1 is connected with the other end of the surge protection tube TVS 1.
On the one hand, the surge protection tube TVS1 can effectively restrain instant high-voltage pulse brought by a power supply, and can clamp voltage to the effect of not more than the maximum allowable voltage of the circuit. On the other hand, the anti-lightning protection device can play a role in lightning protection, preventing voltage fluctuation of a power grid and preventing instant interference of starting of household appliances. The surge protection tube TVS1 overvoltage protection and surge current protection value is selected according to the product demand.
Specifically, the switching circuit further includes: a polar capacitance CE1; the negative output end of the DC input socket J1 is connected with the negative electrode of the polar capacitor CE1, and the positive output end of the DC input socket J1 is connected with the positive electrode of the polar capacitor CE 1.
The switching circuit further includes: a capacitor C1; the negative electrode output end of the DC input socket J1 is connected with one end of the capacitor C1, and the positive electrode output end of the DC input socket J1 is connected with the other end of the capacitor C1.
The polarity capacitor CE1 and the capacitor C1 have the function of power input filtering, and can improve the power stability.
Specifically, the switching circuit further includes: a capacitor C2; one end of the capacitor C2 is connected with the grid electrode of the switch MOS tube U1, and the other end of the capacitor C2 is grounded.
The switching circuit further includes: a capacitor C3 and a capacitor C4; the drain electrode of the switch MOS tube U1 is connected with one ends of the capacitor C3 and the capacitor C4, and the other ends of the capacitor C3 and the capacitor C4 are respectively grounded.
The capacitor C2, the capacitor C3 and the capacitor C4 have the functions of filtering an output power supply and stabilizing voltage, absorb the pulse of the switching moment of the switching MOS tube U1, and enable the operation of a later-stage circuit to be more stable.
The utility model has been further described with reference to specific embodiments, but it should be understood that the detailed description is not to be construed as limiting the spirit and scope of the utility model, but rather as providing those skilled in the art with the benefit of this disclosure with the benefit of their various modifications to the described embodiments.
Claims (8)
1. A power supply switching circuit, comprising: the power supply comprises a DC input socket J1, a switch MOS tube U1, a resistor R1, a power switch S1, a resistor R2, a resistor R3, a DC-DC voltage regulating chip U2, a capacitor C5, an inductor L1, a resistor R4, a resistor R5, a capacitor C6, a capacitor C7, a capacitor C8, a capacitor C9 and a power supply output end Vout; the positive electrode output end of the DC input socket J1 is connected with the source electrode of the switch MOS tube U1, and the negative electrode output end of the DC input socket J1 is grounded;
the source electrode of the switch MOS tube U1 is connected with one end of the resistor R1, the grid electrode of the switch MOS tube U1 and the other end of the resistor R1 are connected with the input end of the power switch S1, the output end of the power switch S1 is connected with one end of the resistor R2, and the other end of the resistor R2 is grounded; the drain electrode of the switch MOS tube U1 is connected with the VIN pin of the DC-DC voltage regulating chip U2, the resistor R3 is connected between the VIN pin and the EN pin of the DC-DC voltage regulating chip U2, the BOOT pin of the DC-DC voltage regulating chip U2 is connected with one end of the capacitor C5, the LX pin of the capacitor C5 and the DC-DC voltage regulating chip U2 is connected with one end of the inductor L1, the other end of the inductor L1 is connected with the power output end Vout, the FB pin of the DC-DC voltage regulating chip U2 is connected with one end of the capacitor C6, the other end of the capacitor C6 is connected with the power output end Vout, the power output end Vout is connected with one ends of the capacitor C7, the capacitor C8 and the capacitor C9, and the other ends of the capacitor C7, the capacitor C8 and the capacitor C9 are respectively grounded;
the resistor R4 is connected with the capacitor C6 in parallel, one end of the resistor R5 is connected with the resistor R4, and the other end of the resistor R5 is grounded.
2. The power supply switching circuit of claim 1, wherein said switching circuit further comprises: a diode D1; the negative pole output end of the DC input socket J1 is connected with the positive pole of the diode D1, and the positive pole output end of the DC input socket J1 is connected with the negative pole of the diode D1.
3. The power supply switching circuit of claim 1, wherein said switching circuit further comprises: a surge protection tube TVS1; the negative electrode output end of the DC input socket J1 is connected with one end of the surge protection tube TVS1, and the positive electrode output end of the DC input socket J1 is connected with the other end of the surge protection tube TVS 1.
4. The power supply switching circuit of claim 1, wherein said switching circuit further comprises: a polar capacitance CE1; the negative electrode output end of the DC input socket J1 is connected with the negative electrode of the polar capacitor CE1, and the positive electrode output end of the DC input socket J1 is connected with the positive electrode of the polar capacitor CE 1.
5. The power supply switching circuit of claim 1, wherein said switching circuit further comprises: a capacitor C1; the negative electrode output end of the DC input socket J1 is connected with one end of the capacitor C1, and the positive electrode output end of the DC input socket J1 is connected with the other end of the capacitor C1.
6. The power supply switching circuit of claim 1, wherein said switching circuit further comprises: a capacitor C2; one end of the capacitor C2 is connected with the grid electrode of the switch MOS tube U1, and the other end of the capacitor C2 is grounded.
7. The power supply switching circuit of claim 1, wherein said switching circuit further comprises: a capacitor C3 and a capacitor C4; the drain electrode of the switch MOS tube U1 is connected with one ends of the capacitor C3 and the capacitor C4, and the other ends of the capacitor C3 and the capacitor C4 are respectively grounded.
8. The power supply switching circuit of claim 1, wherein said switching circuit further comprises: a capacitor C7, a capacitor C8, and a capacitor C9; the power output end Vout is connected with one ends of the capacitor C7, the capacitor C8 and the capacitor C9, and the other ends of the capacitor C7, the capacitor C8 and the capacitor C9 are respectively grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320219563.4U CN219779976U (en) | 2023-01-30 | 2023-01-30 | Power supply switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320219563.4U CN219779976U (en) | 2023-01-30 | 2023-01-30 | Power supply switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219779976U true CN219779976U (en) | 2023-09-29 |
Family
ID=88138524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320219563.4U Active CN219779976U (en) | 2023-01-30 | 2023-01-30 | Power supply switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219779976U (en) |
-
2023
- 2023-01-30 CN CN202320219563.4U patent/CN219779976U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100502195C (en) | Surge restraint circuit | |
| CN103280765A (en) | Overvoltage protection circuit | |
| CN108882450B (en) | Limiting circuit for highest output power of constant-current LED power supply and constant-current LED power supply circuit | |
| CN203787956U (en) | Surge voltage suppression circuit | |
| CN105762781A (en) | Surge current control circuit and power supply device | |
| CN109245082A (en) | Two-way switch circuit that is a kind of anti-reverse and inhibiting power-on surge current | |
| JP2013121203A (en) | Surge voltage protection circuit | |
| CN109038504B (en) | Hiccup type protection circuit of direct current power supply | |
| CN212163157U (en) | Driving circuit of startup input surge current prevention relay | |
| CN219779976U (en) | Power supply switching circuit | |
| CN105356437A (en) | Anti-surge circuit | |
| CN210007618U (en) | DC conversion circuit with anti-surge function and DC conversion system | |
| CN203289075U (en) | Overvoltage protection circuit | |
| CN211015185U (en) | Power-on control circuit and power-on control system of steering engine | |
| CN209805675U (en) | Logic voltage conversion circuit applied to T-CON board | |
| CN210605505U (en) | DC voltage stabilizing circuit, power circuit and intelligent circuit breaker controller | |
| CN112242787A (en) | Simple impact current suppression circuit | |
| CN218526236U (en) | Controllable wide voltage linear voltage-stabilized power supply of chronogenesis | |
| CN215956266U (en) | DC power supply slow starting circuit with current limiting function | |
| CN111026215A (en) | Power-on control circuit and power-on control system of steering engine | |
| CN215420094U (en) | Soft start circuit for direct-current power supply | |
| CN213521662U (en) | Simple impact current suppression circuit | |
| CN218976559U (en) | Surge suppressor and electric equipment | |
| CN219227421U (en) | Starting circuit of auxiliary power supply applied to high-frequency switching power supply | |
| CN210468793U (en) | High-voltage long-delay surge suppressor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |