CN220067213U - Power switch control circuit for direct-current charger and direct-current charger - Google Patents
Power switch control circuit for direct-current charger and direct-current charger Download PDFInfo
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- CN220067213U CN220067213U CN202321495927.8U CN202321495927U CN220067213U CN 220067213 U CN220067213 U CN 220067213U CN 202321495927 U CN202321495927 U CN 202321495927U CN 220067213 U CN220067213 U CN 220067213U
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Abstract
The utility model discloses a power switch control circuit for a direct-current charger and the direct-current charger. The first switch circuit and the second switch circuit have the same circuit structure, and the emitter of the second triode Q2 of the second switch circuit is connected with the base of the first triode Q1 of the first switch circuit. The power supply control chip circuit controls the conduction state of the first triode Q1 through the second triode Q2, and the driving current of the first triode Q1 is provided by the second triode Q2 when high power is output, so that the power supply control chip circuit can ensure the stable conduction of the first triode Q1 only by providing relatively small driving current, and further the maximum input power of the switching power supply using the triode as a switch is improved.
Description
Technical Field
The utility model relates to the technical field of switching power supplies, in particular to a power supply switch control circuit for a direct-current charger and the direct-current charger.
Background
With the rapid development of electronic products, dc chargers are integrated into various household electrical appliances and devices, such as dc chargers with USB interfaces integrated into sockets and power strips. In order to reduce the volume of the direct-current charger, the power switch is controlled by a power control chip. Because the triode has the characteristics of low cost, stable performance, high withstand voltage and the like, the power control chip generally uses the triode as a main power switch in a switching power supply. Referring to fig. 1, a schematic circuit diagram of a power switch control circuit in an embodiment is shown, where the power switch control circuit includes a power control chip circuit 1, a first switch circuit 2 and a feedback circuit 3, and the power control chip circuit 1 is configured to send a switch control signal to the first switch circuit 2. The first switch circuit 2 comprises a first MOS tube M11, a second MOS tube M12 and a first triode Q1, and the first MOS tube M11 and the second MOS tube M12 respond to a switch control signal sent by the power control chip circuit 1 to control the on or off of the first triode Q1 so as to realize the control of the on and off of the high voltage source HV. The feedback circuit 3 includes a sampling resistor R1 and a comparator COMP, where the feedback circuit 3 is configured to monitor a voltage signal of the sampling resistor R1, and send an overcurrent protection signal to the power control chip circuit 1 when the voltage signal of the sampling resistor R1 is greater than a preset comparison voltage V0, so that the power control chip circuit 1 responds to the overcurrent protection signal, and disconnect the high voltage source HV through the first switch circuit 2, thereby implementing overcurrent protection. The power switch control circuit shown in fig. 1 belongs to a current type driving mode, and as the current flowing through the C pole of the first triode Q1 is larger, the driving current of the B pole of the first triode Q1 is larger, so that the currents required by the first MOS tube M11 and the second MOS tube M12 are larger, namely the output current of the power control chip circuit 1 is larger, thus limiting the maximum input power of the switching power supply by using the triode as a switch, the power triode can only be applied in a low-power switching power supply, and greatly reducing the application range of the power switch control circuit. In addition, the power control chip circuit 1 has the problems of increased design difficulty and increased cost of the internal driving chip due to the current of the driving circuit, and reduces the reliability and stability of the driving chip.
Disclosure of Invention
The utility model provides a power adapter and electronic equipment, which are used for optimizing the problem of power consumption of the power adapter in the prior art.
According to a first aspect, there is provided a power switch control circuit for a dc charger, comprising a working power supply connection, a voltage supply connection, a power control chip circuit, a first switch circuit, a second switch circuit and a feedback circuit;
the working power supply connecting end is used for inputting a working power supply VCC so as to provide the working power supply for the power supply control chip circuit;
the voltage source connection end is used for inputting a high voltage source HV;
the power supply control chip circuit is electrically connected with the first switch circuit and the second switch circuit and is used for respectively sending switch control electric signals to the first switch circuit and the second switch circuit;
the first switching circuit comprises a first MOS tube M11, a second MOS tube M12 and a first triode Q1; the grid electrode of the first MOS tube M11 is in circuit connection with the power supply control chip, the source electrode of the first MOS tube M11 is connected with the base electrode of the first triode Q1, and the drain electrode of the first MOS tube M11 is grounded; the grid electrode of the second MOS tube M12 is in circuit connection with the power supply control chip, the source electrode of the second MOS tube M12 is connected with the base electrode of the first triode Q1, and the drain electrode of the second MOS tube M12 is connected with the working power supply connecting end; the collector electrode of the first triode Q1 is connected with the voltage source connecting end, and the emitter electrode of the first triode Q1 is connected with the feedback circuit; the first switch circuit is used for responding to the switch control signal sent by the power control chip circuit to control the on or off of the first triode Q1 so as to realize the control of the on and off of the high voltage source HV;
the second switching circuit comprises a third MOS tube M21, a fourth MOS tube M22 and a second triode Q2; the grid electrode of the third MOS tube M21 is connected with the power supply control chip through a circuit, the source electrode of the third MOS tube M21 is connected with the base electrode of the second triode Q2, and the drain electrode of the third MOS tube M21 is grounded; the grid electrode of the fourth MOS tube M22 is connected with the power supply control chip in a circuit manner, the source electrode of the fourth MOS tube M22 is connected with the base electrode of the second triode Q2, and the drain electrode of the fourth MOS tube M22 is connected with the working power supply connecting end; the collector electrode of the second triode Q2 is connected with the voltage source connecting end, and the emitter electrode of the second triode Q2 is connected with the base electrode of the first triode Q1;
the feedback circuit comprises a sampling resistor R1 and a comparator COMP; one end of the sampling resistor R1 is grounded, and the other end of the sampling resistor R1 is electrically connected with the comparator COMP and the emitter of the first triode Q1; the comparator COMP is electrically connected with the power supply control chip circuit; the feedback circuit is used for monitoring the voltage signal of the sampling resistor R1, and sending an overcurrent protection electric signal to the power supply control chip circuit when the voltage signal of the sampling resistor R1 is larger than a preset comparison voltage V0; the power supply control chip circuit is also used for responding to the overcurrent protection electric signal and disconnecting the electric connection with the high voltage source HV through the first switch circuit.
In an embodiment, the first MOS transistor M11 and the third MOS transistor M21 are N-type MOS transistors; the second MOS tube M12 and the fourth MOS tube M22 are P-type MOS tubes.
In one embodiment, the voltage value of the comparison voltage V0 is 0.5V.
In one embodiment, the high voltage source HV is dc.
In one embodiment, the high voltage source HV is a dc power rectified by a mains supply.
According to a second aspect, there is provided a dc charger comprising a power switch control circuit as described in the first aspect. In an embodiment, the voltage value of the dc power supply output by the dc charger is 5V or 12V.
The power switch control circuit according to the above embodiment includes a power control chip circuit, a first switch circuit, a second switch circuit and a feedback circuit, wherein the circuit structures of the first switch circuit and the second switch circuit are the same, and the emitter of the second triode Q2 of the second switch circuit is connected with the base of the first triode Q1 of the first switch circuit. The power supply control chip circuit controls the conduction state of the first triode Q1 through the second triode Q2, and the driving current of the first triode Q1 is provided by the second triode Q2 when high power is output, so that the power supply control chip circuit can ensure the stable conduction of the first triode Q1 only by providing relatively small driving current, and further the maximum input power of the switching power supply using the triode as a switch is improved.
Drawings
FIG. 1 is a schematic diagram of a circuit configuration of a power switch control circuit in an embodiment;
fig. 2 is a schematic circuit diagram of a power switch control circuit in another embodiment.
Detailed Description
The utility model will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present utility model. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, related operations of the present utility model have not been shown or described in the specification in order to avoid obscuring the core portions of the present utility model, and may be unnecessary to persons skilled in the art from a detailed description of the related operations, which may be presented in the description and general knowledge of one skilled in the art.
Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated.
Example 1
Referring to fig. 2, a schematic circuit diagram of a power switch control circuit in another embodiment is shown, where the power switch control circuit includes a working power connection terminal, a voltage source connection terminal, a power control chip circuit 10, a first switch circuit 20, a second switch circuit 30, and a feedback circuit 40. The working power connection is used for inputting the working power VCC to supply the working power to the power control chip circuit 10. The voltage source connection is used for the input of the high voltage source HV. In one embodiment, the high voltage source HV is a dc power rectified by a mains supply.
The power control chip circuit 10 is electrically connected to the first switch circuit 20 and the second switch circuit 30, and the power control chip circuit 10 is configured to send switch control electrical signals to the first switch circuit 20 and the second switch circuit 30, respectively. The first switch circuit 20 includes a first MOS transistor M11, a second MOS transistor M12, and a first transistor Q1. The grid electrode of the first MOS tube M11 is connected with the power control chip through a circuit, the source electrode of the first MOS tube M11 is connected with the base electrode of the first triode Q1, and the drain electrode of the first MOS tube M11 is grounded. The grid electrode of the second MOS tube M12 is connected with the power supply control chip circuit 10, the source electrode of the second MOS tube M12 is connected with the base electrode of the first triode Q1, and the drain electrode of the second MOS tube M12 is connected with the working power supply connecting end. The collector of the first triode Q1 is connected with the voltage source connection end, and the emitter of the first triode Q1 is connected with the feedback circuit 40. The first switch circuit 20 is configured to control on or off of the first triode Q1 in response to a switch control signal sent from the power control chip circuit 10, so as to control on and off of the high voltage source HV.
The second switching circuit 30 includes a third MOS transistor M21, a fourth MOS transistor M22, and a second transistor Q2. The grid of the third MOS tube M21 is connected with the power control chip circuit 10, the source electrode of the third MOS tube M21 is connected with the base electrode of the second triode Q2, and the drain electrode of the third MOS tube M21 is grounded. The grid electrode of the fourth MOS tube M22 is connected with the power supply control chip circuit 10, the source electrode of the fourth MOS tube M22 is connected with the base electrode of the second triode Q2, and the drain electrode of the fourth MOS tube M22 is connected with the working power supply connecting end. The collector of the second triode Q2 is connected with the voltage source connecting end, and the emitter of the second triode Q2 is connected with the base of the first triode Q1.
The feedback circuit 40 includes a sampling resistor R1 and a comparator COMP. One end of the sampling resistor R1 is grounded, and the other end of the sampling resistor R1 is electrically connected with the comparator COMP and the emitter of the first triode Q1. The comparator COMP is electrically connected to the power supply control chip circuit 10. The feedback circuit 40 is configured to monitor the voltage signal of the sampling resistor R1, and send an overcurrent protection electrical signal to the power control chip circuit 10 when the voltage signal of the sampling resistor R1 is greater than a preset comparison voltage V0. The power control chip circuit 10 is further configured to disconnect the electrical connection to the high voltage source HV through the first switch circuit 20 in response to the over-current protection electrical signal. In one embodiment, the voltage value of the comparison voltage V0 is 0.5V.
In one embodiment, the first MOS transistor M11 and the third MOS transistor M21 are N-type MOS transistors, and the second MOS transistor M12 and the fourth MOS transistor M22 are P-type MOS transistors.
The embodiment of the utility model also discloses a direct-current charger which comprises the power switch control circuit. In one embodiment, the voltage value of the dc power supply output by the dc charger is 5V or 12V.
In an embodiment of the utility model, a power switch control circuit for a direct current charger is disclosed, comprising a power control chip circuit, a first switch circuit, a second switch circuit and a feedback circuit. The first switch circuit and the second switch circuit have the same circuit structure, and the emitter of the second triode Q2 of the second switch circuit is connected with the base of the first triode Q1 of the first switch circuit. The power supply control chip circuit controls the conduction state of the first triode Q1 through the second triode Q2, and the driving current of the first triode Q1 is provided by the second triode Q2 when high power is output, so that the power supply control chip circuit can ensure the stable conduction of the first triode Q1 only by providing relatively small driving current, and further the maximum input power of the switching power supply using the triode as a switch is improved.
The foregoing description of the utility model has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the utility model pertains, based on the idea of the utility model.
Claims (7)
1. The power switch control circuit for the direct-current charger is characterized by comprising a working power supply connecting end, a voltage source connecting end, a power control chip circuit, a first switch circuit, a second switch circuit and a feedback circuit;
the working power supply connecting end is used for inputting a working power supply VCC so as to provide the working power supply for the power supply control chip circuit;
the voltage source connection end is used for inputting a high voltage source HV;
the power supply control chip circuit is electrically connected with the first switch circuit and the second switch circuit and is used for respectively sending switch control electric signals to the first switch circuit and the second switch circuit;
the first switching circuit comprises a first MOS tube M11, a second MOS tube M12 and a first triode Q1; the grid electrode of the first MOS tube M11 is in circuit connection with the power supply control chip, the source electrode of the first MOS tube M11 is connected with the base electrode of the first triode Q1, and the drain electrode of the first MOS tube M11 is grounded; the grid electrode of the second MOS tube M12 is in circuit connection with the power supply control chip, the source electrode of the second MOS tube M12 is connected with the base electrode of the first triode Q1, and the drain electrode of the second MOS tube M12 is connected with the working power supply connecting end; the collector electrode of the first triode Q1 is connected with the voltage source connecting end, and the emitter electrode of the first triode Q1 is connected with the feedback circuit; the first switch circuit is used for responding to the switch control signal sent by the power control chip circuit to control the on or off of the first triode Q1 so as to realize the control of the on and off of the high voltage source HV;
the second switching circuit comprises a third MOS tube M21, a fourth MOS tube M22 and a second triode Q2; the grid electrode of the third MOS tube M21 is connected with the power supply control chip through a circuit, the source electrode of the third MOS tube M21 is connected with the base electrode of the second triode Q2, and the drain electrode of the third MOS tube M21 is grounded; the grid electrode of the fourth MOS tube M22 is connected with the power supply control chip in a circuit manner, the source electrode of the fourth MOS tube M22 is connected with the base electrode of the second triode Q2, and the drain electrode of the fourth MOS tube M22 is connected with the working power supply connecting end; the collector electrode of the second triode Q2 is connected with the voltage source connecting end, and the emitter electrode of the second triode Q2 is connected with the base electrode of the first triode Q1;
the feedback circuit comprises a sampling resistor R1 and a comparator COMP; one end of the sampling resistor R1 is grounded, and the other end of the sampling resistor R1 is electrically connected with the comparator COMP and the emitter of the first triode Q1; the comparator COMP is electrically connected with the power supply control chip circuit; the feedback circuit is used for monitoring the voltage signal of the sampling resistor R1, and sending an overcurrent protection electric signal to the power supply control chip circuit when the voltage signal of the sampling resistor R1 is larger than a preset comparison voltage V0; the power supply control chip circuit is also used for responding to the overcurrent protection electric signal and disconnecting the electric connection with the high voltage source HV through the first switch circuit.
2. The power switch control circuit according to claim 1, wherein the first MOS transistor M11 and the third MOS transistor M21 are N-type MOS transistors; the second MOS tube M12 and the fourth MOS tube M22 are P-type MOS tubes.
3. The power switch control circuit according to claim 1, wherein the voltage value of the comparison voltage V0 is 0.5V.
4. The power switch control circuit of claim 1 wherein the high voltage source HV is direct current.
5. The power switch control circuit of claim 4 wherein said high voltage source HV is a mains rectified dc power.
6. A direct current charger comprising the power switch control circuit according to any one of claims 1 to 5.
7. The direct current charger of claim 6 wherein the output direct current power supply has a voltage of 5V or 12V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321495927.8U CN220067213U (en) | 2023-06-13 | 2023-06-13 | Power switch control circuit for direct-current charger and direct-current charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321495927.8U CN220067213U (en) | 2023-06-13 | 2023-06-13 | Power switch control circuit for direct-current charger and direct-current charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220067213U true CN220067213U (en) | 2023-11-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321495927.8U Active CN220067213U (en) | 2023-06-13 | 2023-06-13 | Power switch control circuit for direct-current charger and direct-current charger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220067213U (en) |
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2023
- 2023-06-13 CN CN202321495927.8U patent/CN220067213U/en active Active
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