CN214707141U - Power adapter - Google Patents
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- CN214707141U CN214707141U CN202120351958.0U CN202120351958U CN214707141U CN 214707141 U CN214707141 U CN 214707141U CN 202120351958 U CN202120351958 U CN 202120351958U CN 214707141 U CN214707141 U CN 214707141U
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- 238000001514 detection method Methods 0.000 claims abstract description 41
- 239000003990 capacitor Substances 0.000 claims description 49
- 238000001914 filtration Methods 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 8
- 101100100146 Candida albicans NTC1 gene Proteins 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The utility model discloses a power adapter. The power adapter is internally provided with a switch circuit, a transformer, an output circuit, a first temperature detection circuit, a second temperature detection circuit and a control chip; the primary coil warp of transformer switching circuit's first end and commercial power connection, the auxiliary coil warp of transformer first temperature detect circuit with control chip connects, the secondary coil of transformer with output circuit's input is connected, output circuit's output is connected with the load, output circuit's output still warp second temperature detect circuit with control chip connects, control chip with switching circuit's second end is connected. The transformer and the output circuit of the power adapter are subjected to temperature detection, and power supply is cut off in time when the transformer or the output circuit is over-temperature, so that the safety of the power adapter is improved.
Description
Technical Field
The utility model relates to the field of electronic technology, especially, relate to a power adapter.
Background
The power adapter is a power supply device for electronic equipment, converts an alternating current input into a direct current output according to the working principle, and is widely applied to various electronic equipment.
The high-frequency switch transformer and the Schottky rectifier diode are generally needed to be adopted in the existing power adapter, the devices are main heating sources of the power adapter, when the electronic equipment uses the power adapter to supply power, if the temperature of the devices in the power adapter is too high, the functions of the components inside the power adapter or the electronic equipment are affected, and further normal power supply cannot be realized, safety accidents can also happen in serious conditions, and the safety is low.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a power adapter aims at solving among the prior art power adapter the low technical problem of security when the high temperature.
To achieve the above object, the present invention provides a power adapter, which includes: the temperature control circuit comprises a switching circuit, a transformer, an output circuit, a first temperature detection circuit, a second temperature detection circuit and a control chip; the primary coil of the transformer is connected with a mains supply through the first end of the switch circuit, the auxiliary coil of the transformer is connected with the control chip through the first temperature detection circuit, the secondary coil of the transformer is connected with the input end of the output circuit, the output end of the output circuit is connected with a load, the output end of the output circuit is also connected with the control chip through the second temperature detection circuit, and the control chip is connected with the second end of the switch circuit; wherein the content of the first and second substances,
the first temperature detection circuit is used for detecting the voltage of the transformer and sending a first voltage to the control chip;
the second temperature detection circuit is used for detecting the voltage output by the output circuit and sending a second voltage to the control chip;
the control chip is used for judging whether the transformer is over-temperature according to the first voltage, judging whether the output circuit is over-temperature according to the second voltage, and controlling the switch circuit to be switched off when the transformer or the output circuit is over-temperature.
Preferably, the first temperature detection circuit comprises a first resistor, a second resistor, a first thermistor and a first diode; wherein the content of the first and second substances,
the first end of the first resistor is respectively connected with the first end of the auxiliary coil and the first end of the second resistor, and the second end of the first resistor is respectively connected with the first end of the first thermistor and the first feedback end of the control chip;
the second end of the first thermistor is grounded;
a second end of the second resistor is connected with an anode of the first diode;
and the cathode of the first diode is connected with the power supply end of the control chip.
Preferably, the first temperature detection circuit further includes a first capacitor; the first end of the first capacitor is connected with the second end of the first resistor, and the second end of the first capacitor is grounded.
Preferably, the output circuit includes a second capacitor, a third capacitor, a second diode and a third resistor; wherein the content of the first and second substances,
the third resistor is connected in series with the second capacitor and then connected in parallel with the second diode, the anode of the second diode is connected with the first end of the secondary coil, and the cathode of the second diode is respectively connected with the first end of the third capacitor and the load;
and the second end of the third capacitor is grounded.
Preferably, the second temperature detection circuit includes a fourth resistor and a second thermistor; the first end of the fourth resistor is connected with the first end of the third capacitor, the second end of the fourth resistor is respectively connected with the first end of the second thermistor and the second feedback end of the control chip, and the second end of the second thermistor is grounded.
Preferably, the switch circuit comprises a normally closed relay, one end of a contact of the normally closed relay is connected with a first end of a primary coil of the transformer, and a coil of the normally closed relay is connected with a coil of the control chip.
Preferably, the power adapter further comprises an input circuit, and the other end of the contact of the normally closed relay is connected with the mains supply through the input circuit.
Preferably, the input circuit includes a rectifying unit and a filtering unit; the input end of the rectifying unit is connected with the mains supply, the output end of the rectifying unit is connected with the input end of the filtering unit, and the output end of the filtering unit is connected with the other end of the contact of the normally closed relay.
Preferably, the rectifying unit is a rectifying bridge.
Preferably, the filtering unit includes a fourth capacitor, a fifth capacitor and a common mode inductor; wherein the content of the first and second substances,
a first end of the fourth capacitor is connected with a first end of the common-mode inductor and a first end of the rectifier bridge respectively, and a second end of the fourth capacitor is connected with a second end of the common-mode inductor and a second end of the rectifier bridge respectively;
the third end of the common-mode inductor is respectively connected with the first end of the fifth capacitor and the other end of the contact of the normally closed relay, and the fourth end of the common-mode inductor is grounded;
the second end of the fifth capacitor is grounded
The utility model arranges a switch circuit, a transformer, an output circuit, a first temperature detection circuit, a second temperature detection circuit and a control chip in the power adapter; the primary coil warp of transformer switching circuit's first end and commercial power connection, the auxiliary coil warp of transformer first temperature detect circuit with control chip connects, the secondary coil of transformer with output circuit's input is connected, output circuit's output is connected with the load, output circuit's output still warp second temperature detect circuit with control chip connects, control chip with switching circuit's second end is connected. The transformer and the output circuit of the power adapter are subjected to temperature detection, and power supply is cut off in time when the transformer or the output circuit is over-temperature, so that the safety of the power adapter is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a functional block diagram of an embodiment of the power adapter of the present invention;
fig. 2 is a schematic diagram of an alternative configuration of the power adapter of fig. 1.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Switching circuit | C1～C5 | First to fifth capacitors |
| T1 | Transformer device | K1 | Normally closed |
| 200 | Output circuit | NTC1～NTC2 | First to |
| 300 | First temperature detection circuit | D1～D2 | First to |
| 400 | Second temperature detection circuit | R1～R4 | First to fourth resistors |
| IC | Control chip | DP1 | |
| 500 | Input circuit | L1 | |
| 510 | Rectifying unit | AC | |
| 520 | Filter unit | VOUT | Load(s) |
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a power adapter.
Referring to fig. 1, in an embodiment, the power adapter includes a switch circuit 100, a transformer T1, an output circuit 200, a first temperature detection circuit 300, a second temperature detection circuit 400, and a control chip IC; a primary coil (not labeled) of the transformer T1 is connected to the commercial power AC via a first terminal of the switch circuit 100, an auxiliary coil (not labeled) of the transformer T1 is connected to the control chip IC via the first temperature detection circuit 300, a secondary coil (not labeled) of the transformer T1 is connected to an input terminal of the output circuit 200, an output terminal of the output circuit 200 is connected to the load VOUT, an output terminal of the output circuit 200 is further connected to the control chip IC via the second temperature detection circuit 400, and the control chip IC is connected to a second terminal of the switch circuit 100; the first temperature detection circuit 300 is configured to perform voltage detection on the transformer T1, and send a first voltage to the control chip IC; the second temperature detection circuit 400 is configured to detect the voltage output by the output circuit 200 and send a second voltage to the control chip IC; the control chip IC is configured to determine whether the transformer T1 is over-temperature according to the first voltage, determine whether the output circuit 200 is over-temperature according to the second voltage, and control the switch circuit 100 to be turned off when the transformer T1 or the output circuit 200 is over-temperature.
It should be understood that, the power adapter usually converts the high voltage of the commercial AC into the low voltage by the transformer T1, and outputs the low voltage to the load VOUT through the output circuit 200, and the main heat source of the power adapter is a schottky rectifying diode, a high frequency switching transformer, and the like in the output circuit.
In an embodiment, the power adapter further includes an input circuit 500, and the switch circuit 100 is connected to the mains AC via the input circuit 500, wherein the input circuit 500 is configured to rectify and filter the mains AC, so as to stabilize the voltage signal obtained by the transformer T1.
In the embodiment, a switch circuit, a transformer, an output circuit, a first temperature detection circuit, a second temperature detection circuit and a control chip are arranged in a power adapter; the primary coil warp of transformer switching circuit's first end and commercial power connection, the auxiliary coil warp of transformer first temperature detect circuit with control chip connects, the secondary coil of transformer with output circuit's input is connected, output circuit's output is connected with the load, output circuit's output still warp second temperature detect circuit with control chip connects, control chip with switching circuit's second end is connected. The transformer and the output circuit of the power adapter are subjected to temperature detection, and power supply is cut off in time when the transformer or the output circuit is over-temperature, so that the safety of the power adapter is improved.
Referring to fig. 1 and fig. 2 together, fig. 2 is a schematic diagram of an alternative structure of the power adapter of fig. 1.
In this embodiment, the first temperature detecting circuit 300 includes a first resistor R1, a second resistor R2, a first thermistor NTC1, and a first diode D1; a first end of the first resistor R1 is connected to a first end of the auxiliary coil and a first end of the second resistor R2, respectively, and a second end of the first resistor R1 is connected to a first end of the first thermistor NTC1 and a first feedback end FB1 of the control chip IC, respectively; a second end of the first thermistor NTC1 is grounded; a second terminal of the second resistor R2 is connected to the anode of the first diode D1; the cathode of the first diode D1 is connected to the power supply terminal VCC of the control chip IC.
It can be understood that the first diode D1 is a rectifier diode, and forms a rectifier circuit with the second resistor R2, which functions to provide continuous power supply for the control chip IC after the control chip IC is started.
Since the thermistor has the characteristic of exhibiting different resistance values at different temperatures, the voltage of the auxiliary coil of the transformer T1 is divided by the first resistor R1 and the first thermistor NTC1, and the first voltage is fed back to the control chip IC, and the control chip IC can calculate the temperature of the first thermistor NTC1 according to the first voltage, so as to estimate the temperature of the transformer T1.
In one embodiment, the first resistor R1 and the second resistor R2 are common resistors, and the first thermistor NTC1 is a negative temperature coefficient thermistor.
Further, the first temperature detection circuit 300 further includes a first capacitor C1; the first end of the first capacitor C1 is connected to the second end of the first resistor R1, and the second end of the first capacitor C1 is grounded.
It should be understood that the first capacitor C1 is a filter capacitor for filtering the first voltage input to the control chip IC, so that the control chip IC obtains a more accurate voltage signal.
Further, the output circuit 200 includes a second capacitor C2, a third capacitor C3, a second diode D2, and a third resistor R3; the third resistor R3 is connected in series with the second capacitor C2 and then connected in parallel with the second diode D2, the anode of the second diode D2 is connected to the first end of the secondary winding, and the cathode of the second diode D2 is connected to the first end of the third capacitor C3 and the load VOUT, respectively; the second terminal of the third capacitor C3 is grounded.
The second temperature detection circuit 400 comprises a fourth resistor R4 and a second thermistor NTC 2; a first end of the fourth resistor R4 is connected to a first end of the third capacitor C3, a second end of the fourth resistor R4 is connected to a first end of the second thermistor NTC2 and a second feedback end FB2 of the control chip IC, respectively, and a second end of the second thermistor NTC2 is grounded.
It should be noted that the second diode D2 is a low-voltage schottky rectifying diode, which is one of the main heat sources in the power adapter, and the embodiment detects the voltage output by the output circuit 200, divides the voltage by the fourth resistor R4 and the second thermistor NTC2 to obtain a second voltage, and sends the second voltage to the control chip IC, and the control chip IC can calculate the temperature of the second thermistor NTC2 according to the second voltage, so as to estimate the temperature of the schottky rectifying diode in the output circuit 200.
Further, the switch circuit 100 includes a normally closed relay K1, one end of a contact of the normally closed relay K1 is connected to a first end of the primary coil of the transformer T1, and a coil of the normally closed relay K1 is connected to a coil of the control chip IC.
It can be understood that when the power adapter is in a normal state, the normally closed relay K1 is closed, and power supply to the load VOUT is not affected, and when the control chip IC detects that the temperature of the power adapter is too high, the normally closed relay K1 is controlled to be opened, and the power adapter stops supplying power to the load VOUT.
Further, the power adapter further comprises an input circuit 500, and the other end of the contact of the normally closed relay K1 is connected with the mains supply AC through the input circuit 500.
The input circuit 500 includes a rectifying unit 510 and a filtering unit 520; the input end of the rectifying unit 510 is connected with the mains supply AC, the output end of the rectifying unit 510 is connected with the input end of the filtering unit 520, and the output end of the filtering unit 520 is connected with the other end of the contact of the normally closed relay K1. The rectifying unit 510 is a rectifying bridge DP 1.
Further, the filtering unit 520 includes a fourth capacitor C4, a fifth capacitor C5, and a common mode inductor L1; a first end of the fourth capacitor C4 is connected to a first end of the common mode inductor L1 and a first end of the rectifier bridge DP1, respectively, and a second end of the fourth capacitor C4 is connected to a second end of the common mode inductor L1 and a second end of the rectifier bridge DP1, respectively; the third end of the common-mode inductor L1 is respectively connected with the first end of the fifth capacitor C5 and the other end of the contact of the normally closed relay K1, and the fourth end of the common-mode inductor L1 is grounded; the second terminal of the fifth capacitor C5 is grounded.
It should be understood that the AC voltage of the utility AC is rectified into a pulsating dc voltage through the rectifier bridge DP1, and the filter unit 520 filters the pulsating dc voltage through the filter capacitor to obtain a smooth and stable dc voltage, and the dc voltage is transmitted to the transformer T1 through the switch circuit 100 to realize the voltage conversion.
The embodiment realizes the over-temperature detection and control of the power adapter by using simple electronic devices through the specific design of the switch circuit, the transformer, the output circuit, the first temperature detection circuit and the second temperature detection circuit, reduces the cost of the product, and improves the reliability and the safety of the product.
The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. A power adapter is characterized by comprising a switch circuit, a transformer, an output circuit, a first temperature detection circuit, a second temperature detection circuit and a control chip; the primary coil of the transformer is connected with a mains supply through the first end of the switch circuit, the auxiliary coil of the transformer is connected with the control chip through the first temperature detection circuit, the secondary coil of the transformer is connected with the input end of the output circuit, the output end of the output circuit is connected with a load, the output end of the output circuit is also connected with the control chip through the second temperature detection circuit, and the control chip is connected with the second end of the switch circuit; wherein the content of the first and second substances,
the first temperature detection circuit is used for detecting the voltage of the transformer and sending a first voltage to the control chip;
the second temperature detection circuit is used for detecting the voltage output by the output circuit and sending a second voltage to the control chip;
the control chip is used for judging whether the transformer is over-temperature according to the first voltage, judging whether the output circuit is over-temperature according to the second voltage, and controlling the switch circuit to be switched off when the transformer or the output circuit is over-temperature.
2. The power adapter as claimed in claim 1, wherein the first temperature detection circuit comprises a first resistor, a second resistor, a first thermistor, and a first diode; wherein the content of the first and second substances,
the first end of the first resistor is respectively connected with the first end of the auxiliary coil and the first end of the second resistor, and the second end of the first resistor is respectively connected with the first end of the first thermistor and the first feedback end of the control chip;
the second end of the first thermistor is grounded;
a second end of the second resistor is connected with an anode of the first diode;
and the cathode of the first diode is connected with the power supply end of the control chip.
3. The power adapter as claimed in claim 2, wherein the first temperature detection circuit further comprises a first capacitor; the first end of the first capacitor is connected with the second end of the first resistor, and the second end of the first capacitor is grounded.
4. The power adapter as claimed in claim 3, wherein the output circuit comprises a second capacitor, a third capacitor, a second diode and a third resistor; wherein the content of the first and second substances,
the third resistor is connected in series with the second capacitor and then connected in parallel with the second diode, the anode of the second diode is connected with the first end of the secondary coil, and the cathode of the second diode is respectively connected with the first end of the third capacitor and the load;
and the second end of the third capacitor is grounded.
5. The power adapter as claimed in claim 4, wherein the second temperature detection circuit comprises a fourth resistor and a second thermistor; the first end of the fourth resistor is connected with the first end of the third capacitor, the second end of the fourth resistor is respectively connected with the first end of the second thermistor and the second feedback end of the control chip, and the second end of the second thermistor is grounded.
6. The power adapter as claimed in claim 5, wherein the switching circuit includes a normally closed relay having a contact connected at one end to a first end of a primary coil of the transformer, a coil of the normally closed relay being connected to a coil of the control chip.
7. The power adapter as claimed in claim 6, wherein the power adapter further comprises an input circuit, and the other end of the contact of the normally closed relay is connected to the mains power via the input circuit.
8. The power adapter as claimed in claim 7, wherein the input circuit comprises a rectifying unit and a filtering unit; the input end of the rectifying unit is connected with the mains supply, the output end of the rectifying unit is connected with the input end of the filtering unit, and the output end of the filtering unit is connected with the other end of the contact of the normally closed relay.
9. The power adapter as claimed in claim 8, wherein the rectifying unit is a rectifying bridge.
10. The power adapter as claimed in claim 9, wherein the filter unit comprises a fourth capacitor, a fifth capacitor and a common mode inductor; wherein the content of the first and second substances,
a first end of the fourth capacitor is connected with a first end of the common-mode inductor and a first end of the rectifier bridge respectively, and a second end of the fourth capacitor is connected with a second end of the common-mode inductor and a second end of the rectifier bridge respectively;
the third end of the common-mode inductor is respectively connected with the first end of the fifth capacitor and the other end of the contact of the normally closed relay, and the fourth end of the common-mode inductor is grounded;
and the second end of the fifth capacitor is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120351958.0U CN214707141U (en) | 2021-02-07 | 2021-02-07 | Power adapter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120351958.0U CN214707141U (en) | 2021-02-07 | 2021-02-07 | Power adapter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214707141U true CN214707141U (en) | 2021-11-12 |
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ID=78567178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120351958.0U Expired - Fee Related CN214707141U (en) | 2021-02-07 | 2021-02-07 | Power adapter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214707141U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116667678A (en) * | 2022-11-28 | 2023-08-29 | 荣耀终端有限公司 | Power supply circuit, power supply adapter and charging system |
-
2021
- 2021-02-07 CN CN202120351958.0U patent/CN214707141U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116667678A (en) * | 2022-11-28 | 2023-08-29 | 荣耀终端有限公司 | Power supply circuit, power supply adapter and charging system |
| CN116667678B (en) * | 2022-11-28 | 2023-12-05 | 荣耀终端有限公司 | Power supply circuit, power supply adapter and charging system |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211112 |
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| CF01 | Termination of patent right due to non-payment of annual fee |