CN216490430U - Time-delay power supply circuit - Google Patents
Time-delay power supply circuit Download PDFInfo
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- CN216490430U CN216490430U CN202123201568.4U CN202123201568U CN216490430U CN 216490430 U CN216490430 U CN 216490430U CN 202123201568 U CN202123201568 U CN 202123201568U CN 216490430 U CN216490430 U CN 216490430U
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Abstract
The utility model relates to an adapter power supply technical field especially relates to a time delay power supply circuit. It includes: the interface end is used for being connected with the output end of the adapter and is provided with a DET terminal and a DCIN terminal, and the DCIN terminal is connected with an output end VC through an electronic switch tube; the control end of the electronic switching tube is connected with a control circuit for controlling the conduction of the electronic switching tube; the DCIN terminal is grounded through a resistor R2 and a capacitor C1 which are connected in series, the control circuit comprises a triode Q1, and the base electrode of the triode Q1 is connected with the positive electrode of a capacitor C1; when the transistor Q1 is conducted, the control circuit controls the electronic switch tube to conduct. The utility model discloses regard electric capacity charge time as the time delay, produce the spark when avoiding power cord and adapter contact.
Description
Technical Field
The utility model relates to an adapter power supply technical field especially relates to a time delay power supply circuit.
Background
With the development of electronic technology, many electronic products appear on the market at present, and when the electronic products are powered, an adapter is generally adopted for supplying power; when the adapter is adopted for supplying power, the power line is connected with the adapter, the output current of the inverted adapter is suddenly increased due to a larger load, and meanwhile, the output power of the adapter is instantaneously very high due to a larger contact resistance when just in contact, so that electric sparks occur; the occurrence of such sparks has a great impact on the adapter and also on the use.
Disclosure of Invention
An object of the utility model is to prior art not enough, provide a time delay supply circuit, this time delay supply circuit uses on electrical apparatus, when electrical apparatus passes through the power cord to be connected with the adapter, extends supply circuit and can prolong the on-time of power cord and adapter, and contact resistance when reducing the circular telegram avoids the spark to form.
A time-delayed supply circuit, comprising: the interface end is used for being connected with the output end of the adapter and is provided with a DET terminal and a DCIN terminal, and the DCIN terminal is connected with an output end VC through an electronic switch tube; the control end of the electronic switching tube is connected with a control circuit for controlling the conduction of the electronic switching tube;
the DCIN terminal is grounded through a resistor R2 and a capacitor C1 which are connected in series, the control circuit comprises a triode Q1, and the base electrode of the triode Q1 is connected with the positive electrode of a capacitor C1; when the transistor Q1 is conducted, the control circuit controls the electronic switch tube to conduct.
Furthermore, the electronic switching tube comprises a P-type MOS tube Q2, the S pole of the MOS tube Q2 is connected with the DCIN terminal, and the D pole of the MOS tube Q2 is connected with the output end VC; the G pole of the MOS transistor Q2 and the collector of the triode Q1, the emitter of the triode Q1 is grounded, the control circuit comprises a resistor R5, and two ends of the resistor R5 are respectively connected with the S pole and the G pole.
Furthermore, the base of the triode Q1 is connected with a voltage dividing circuit, the voltage dividing circuit comprises a resistor R3 and a resistor R4 which are connected in series, the resistor R3 is connected with the anode of the capacitor C1, the cathode of the resistor R4 is grounded, and the anode of the resistor R4 is connected with the base of the triode Q1.
Further, the output end VC is connected to a capacitor C2 and a capacitor C3 connected in parallel and grounded.
The utility model has the advantages that: the utility model discloses regard electric capacity charge time as the time delay, produce the spark when avoiding power cord and adapter contact.
Drawings
Fig. 1 is a schematic circuit diagram of the present embodiment.
Detailed Description
The following detailed description of the present invention is made with reference to the accompanying drawings. As shown in fig. 1.
Example 1: a time-delayed supply circuit, comprising: the interface end is used for being connected with the output end of the adapter and is provided with a DET terminal and a DCIN terminal, and the DCIN terminal is connected with an output end VC through an electronic switch tube; the control end of the electronic switching tube is connected with a control circuit for controlling the conduction of the electronic switching tube;
the DCIN terminal is grounded through a resistor R2 and a capacitor C1 which are connected in series, the control circuit comprises a triode Q1, and the base electrode of the triode Q1 is connected with the positive electrode of a capacitor C1; when the transistor Q1 is conducted, the control circuit controls the electronic switch tube to conduct.
When this technical scheme implemented, the interface end was connected with the adapter output, and electric capacity C1 charges, and electric capacity C1 provides basic electric potential to triode Q1 simultaneously, and when electric capacity C1 charged to the electric potential of its positive pole makes triode Q1 switch on, control circuit control electron switch tube switches on, and the adapter is external to be supplied power. Because there is a charging time in this process, namely: when in connection, the power is not immediately supplied, but has delay time; this delay time avoids the moment when the contact resistance is large when just contacted; when the power is electrified, the power line is connected with the adapter, and the contact resistance ratio is small; thereby preventing the generation of electric sparks.
Furthermore, the electronic switching tube comprises a P-type MOS tube Q2, the S pole of the MOS tube Q2 is connected with the DCIN terminal, and the D pole of the MOS tube Q2 is connected with the output end VC; the G pole of MOS pipe Q2 and the collector of triode Q1, triode Q1' S emitter ground connection, control circuit include resistance R5, and the both ends of resistance R5 are connected with the S pole, G pole respectively.
When a power line is just connected with an adapter, the capacitor C1 is in a charging process, the triode Q1 is in a cut-off state, the potentials of the S pole and the G pole of the MOS tube Q2 are equal, and the MOS tube Q2 is cut off; when the capacitor C1 is charged to a certain degree, the triode Q1 is conducted, the potential difference between the two ends of the resistor R5 is the potential difference between the G pole and the S pole, the MOS tube Q2 is conducted, and the adapter supplies power to the external output.
Furthermore, the base of the triode Q1 is connected with a voltage dividing circuit, the voltage dividing circuit comprises a resistor R3 and a resistor R4 which are connected in series, the resistor R3 is connected with the anode of the capacitor C1, the cathode of the resistor R4 is grounded, and the anode of the resistor R4 is connected with the base of the triode Q1.
A voltage division circuit is arranged to be matched with the resistor R2 and the capacitor C1 to adjust charging time, namely delay electrifying time.
Further, the output end VC is connected to a capacitor C2 and a capacitor C3 connected in parallel and grounded.
In order to reduce current output fluctuation, the output end VC is connected with a filter capacitor C2 and a capacitor C3.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the present description should not be interpreted as a limitation to the present invention.
Claims (4)
1. A time-delay power supply circuit, characterized by: it includes: the interface end is used for being connected with the output end of the adapter and is provided with a DET terminal and a DCIN terminal, and the DCIN terminal is connected with an output end VC through an electronic switch tube; the control end of the electronic switching tube is connected with a control circuit for controlling the conduction of the electronic switching tube;
the DCIN terminal is grounded through a resistor R2 and a capacitor C1 which are connected in series, the control circuit comprises a triode Q1, and the base electrode of the triode Q1 is connected with the positive electrode of a capacitor C1; when the transistor Q1 is conducted, the control circuit controls the electronic switch tube to conduct.
2. The delay-powered circuit of claim 1, wherein: the electronic switching tube comprises a P-type MOS tube Q2, the S pole of the MOS tube Q2 is connected with the DCIN terminal, and the D pole of the MOS tube Q2 is connected with the output end VC; the G pole of the MOS transistor Q2 and the collector of the triode Q1, the emitter of the triode Q1 is grounded, the control circuit comprises a resistor R5, and two ends of the resistor R5 are respectively connected with the S pole and the G pole.
3. The delay-powered circuit of claim 2, wherein: the base electrode of the triode Q1 is connected with a voltage division circuit, the voltage division circuit comprises a resistor R3 and a resistor R4 which are connected in series, a resistor R3 is connected with the anode of the capacitor C1, the cathode of the resistor R4 is grounded, and the anode of the resistor R4 is connected with the base electrode of the triode Q1.
4. The delay-powered circuit of claim 1, wherein: the output end VC is connected with a capacitor C2 and a capacitor C3 which are connected in parallel and are grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123201568.4U CN216490430U (en) | 2021-12-20 | 2021-12-20 | Time-delay power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123201568.4U CN216490430U (en) | 2021-12-20 | 2021-12-20 | Time-delay power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216490430U true CN216490430U (en) | 2022-05-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123201568.4U Active CN216490430U (en) | 2021-12-20 | 2021-12-20 | Time-delay power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216490430U (en) |
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2021
- 2021-12-20 CN CN202123201568.4U patent/CN216490430U/en active Active
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