Control circuit, control chip and power adapter device

Abstract

The application discloses a control circuit, a control chip and a power adapter. The power adapter comprises a first conducting part, a second conducting part, a primary side and a secondary side. The first conducting part is used for powering on or off the primary side. The second conducting part is used for powering on or off the secondary side. The control circuit comprises a signal generating unit and a logic control unit. The signal generating unit outputs a conducting signal according to a preset pulse signal. The logic control unit outputs an off signal according to the preset pulse signal and the conducting signal. The off signal controls the first conducting part to remain off for a preset time length to power off the primary side. The preset time length is greater than or equal to a time length during which the second conducting part remains on to power on the secondary side. According to the level change of the off signal, the first conducting part can be controlled to remain off for the preset time length. In the process of powering on the secondary side by the second conducting part, the first conducting part can be prevented from being powered on again, so that the machine explosion caused by the false start can be avoided.

Description

Technical Field

[0001] This invention relates to the field of electronic integration technology, and in particular to a control circuit, a control chip, and a power adapter. Background Technology

[0002] As a crucial component of consumer electronics, the safety performance of power adapters is of paramount importance. In related technologies, power adapters utilize transformers to transfer energy. For these transformers, the primary side can be connected to or disconnected from the power source via a switching device, while the secondary side can be connected to or disconnected from the device being charged via another switching device. For safety reasons, only one of these two switching devices can be in a connected state at any given time.

[0003] However, during debugging or practical application, the switching device may be accidentally turned on after being turned off, causing both switching devices to be in a connected state at the same time. This will generate a large voltage spike, which may cause the switching device to exceed its withstand voltage and explode. Summary of the Invention

[0004] This invention provides a control circuit, a control chip, and a power adapter.

[0005] An embodiment of the present invention provides a control circuit for a power adapter device. The power adapter device includes a transformer section, a first conductive element, and a second conductive element. The transformer section has a primary side and a secondary side. The first conductive element is used to selectively energize or de-energize the primary side, and the second conductive element is used to selectively energize or de-energize the secondary side.

[0006] The control circuit includes:

[0007] A signal generation unit is configured to output a conduction signal based on a preset pulse signal. The preset pulse signal has a first level and a second level, and the conduction signal has a third level and a fourth level. When the level of the preset pulse signal changes to the first level, the level of the conduction signal changes from the third level to the fourth level after a preset duration. When the level of the preset pulse signal changes to the second level, the level of the conduction signal changes from the fourth level to the third level.

[0008] A logic control unit is configured to output a shutdown signal based on the preset pulse signal and the turn-on signal. The shutdown signal is configured to control the first conducting element to remain disconnected for the preset duration so that the primary side is de-energized. The preset duration is greater than or equal to the duration for which the second conducting element remains on so that the secondary side is energized.

[0009] The aforementioned control circuit will change the level of the shutdown signal when the level of the preset pulse signal changes to the first level and maintain it for a preset duration. According to the level change of the shutdown signal, the first conducting element can be controlled to remain disconnected for a preset duration. During the process of the second conducting element being turned on to enable power to the secondary side, the first conducting element can be prevented from being turned on again, thereby helping to avoid the problem of machine explosion due to accidental opening.

[0010] In some embodiments, the signal generation unit includes:

[0011] A first control subunit is configured to output a ramp signal based on the preset pulse signal. When the level of the preset pulse signal changes to the first level, the voltage value of the ramp signal increases sequentially; when the level of the preset pulse signal changes to the second level, the voltage value of the ramp signal decreases instantaneously.

[0012] A second control subunit is connected to the first control subunit. The second control subunit is used to output the turn-on signal according to the ramp signal, and to make the level change of the turn-on signal correspond to the level change of the ramp signal.

[0013] In some embodiments, the first control subunit includes:

[0014] The third conducting element is used to selectively turn on or off the first and second points according to the current level of the preset pulse signal; and

[0015] The first energy storage device has its two ends connected to the first point and the second point, respectively. The first energy storage device is used to increase the voltage value of the first point sequentially by storing energy when the third conducting device disconnects the first point and the second point.

[0016] The signal generation unit is connected to the second control subunit through the first point.

[0017] In some embodiments, the first control subunit includes:

[0018] A constant current subunit, connected to the first point, is used to provide a preset current to the path connected to the first point.

[0019] This helps to provide a stable voltage change effect.

[0020] In some embodiments, the second control subunit includes:

[0021] The threshold conduction section connects the second control subunit to the first control subunit via the threshold conduction element. The threshold conduction element is used to output the conduction signal at the fourth level when the voltage value of the ramp signal is greater than the flip threshold, and to output the conduction signal at the third level when the voltage value of the ramp signal is less than the flip threshold.

[0022] In some embodiments, the threshold conduction portion includes:

[0023] A first logic element, connected to the first control subunit, is used to output a signal with a level of either the third or the fourth level based on the ramp signal and the flip threshold; and

[0024] The second logic element, connected to the first logic element, is used to flip the level of the signal output by the first logic element so that the level changes of the conduction signal and the ramp signal are in the same logical direction.

[0025] In some embodiments, the logic control unit includes:

[0026] The third logic element is configured to output the shutdown signal at a sixth level when the level of the preset pulse signal is the first level and the level of the conduction signal is the third level, and to output the shutdown signal at a fifth level when the level of the preset pulse signal is the second level and / or the level of the conduction signal is the fourth level.

[0027] A control chip according to an embodiment of the present invention is used in a power adapter device, the control chip comprising:

[0028] The control circuit of any of the above embodiments; and

[0029] A shutdown control unit is connected to the control circuit and the first conducting element. The shutdown control unit is used to control the first conducting element to remain disconnected for the preset duration according to the preset pulse signal and the shutdown signal so that the primary side is de-energized.

[0030] The aforementioned control chip will change its level when the preset pulse signal level changes to the first level and maintain it for a preset duration. According to the level change of the shutdown signal, the first conducting element can be controlled to remain disconnected for a preset duration. During the process of the second conducting element being turned on to enable power to the secondary side, the first conducting element can be prevented from being turned on again, thereby helping to avoid the problem of machine explosion due to accidental activation.

[0031] In some embodiments, the control chip includes:

[0032] A pulse generation circuit is used to generate the preset pulse signal; and

[0033] The voltage detection terminal is connected to the pulse generation circuit and the first conducting element, and is used to feed back the circuit current of the primary side when it is energized to the pulse generation circuit, so that the pulse generation circuit can adjust the preset pulse signal.

[0034] Thus, adjustments can include the duration of the high level and the duration of the low level.

[0035] A power adapter device according to an embodiment of the present invention includes:

[0036] The transformer section has a primary side and a secondary side, wherein the primary side is used to connect to the power supply terminal and the secondary side is used to connect to the device to be charged;

[0037] A first conductive element is used to selectively energize or de-energize the primary side;

[0038] A second conductive element, the second conductive element being used to selectively energize or de-energize the secondary side; and

[0039] The control chip in any of the above embodiments is used to control the first conductive element to be turned on or off.

[0040] The aforementioned power adapter device will change its level when the preset pulse signal level changes to the first level and maintain it for a preset duration. According to the level change of the shutdown signal, the first conducting element can be controlled to remain disconnected for a preset duration. During the process of the second conducting element being turned on to enable power to the secondary side, the first conducting element can be prevented from being turned on again, thereby helping to avoid the problem of machine explosion due to accidental activation.

[0041] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0042] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0043] Figure 1 This is a schematic diagram of the circuit structure of the control chip according to an embodiment of the present invention;

[0044] Figure 2 This is a schematic diagram of the circuit structure of the power adapter device according to an embodiment of the present invention;

[0045] Figure 3 This is a schematic diagram of the circuit structure of the control circuit according to an embodiment of the present invention;

[0046] Figure 4 This is a timing diagram of the potentials of the preset pulse signal and the ramp signal in an embodiment of the present invention;

[0047] Figure 5 This is a timing diagram of the potentials of the preset pulse signal, the on signal, and the off signal in an embodiment of the present invention.

[0048] Explanation of key component symbols:

[0049] 100 - Power adapter; 110 - First conductive element; 120 - Second conductive element; 130 - Transformer section; 131 - Primary side; 132 - Secondary side; 140 - Power supply terminal; 150 - Device to be charged;

[0050] 200 - Control chip; 210 - Voltage detection terminal; 220 - Pulse generation circuit; 230 - Shutdown control unit;

[0051] 300 - Control circuit; 400 - Signal generation unit; 410 - First control subunit; 411 - Third conducting element; 412 - First energy storage element; 413 - Constant current subunit; 414 - First position; 415 - Second position; 420 - Second control subunit; 421 - Threshold conducting element; 422 - First logic element; 423 - Second logic element; 500 - Logic control unit; 510 - Third logic element;

[0052] 610 - Preset pulse signal; 620 - Ramp signal; 630 - On signal; 640 - Off signal; 650 - Drive signal. Detailed Implementation

[0053] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0054] The following disclosure provides many different embodiments or examples for implementing different structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0055] Please see Figure 1 and Figure 2A control circuit 300 according to an embodiment of the present invention is used in a power adapter device 100. The power adapter device 100 includes a transformer section 130, a first conducting element 110, and a second conducting element 120. The transformer section 130 has a primary side 131 and a secondary side 132. The first conducting element 110 is used to selectively energize or de-energize the primary side 131, and the second conducting element 120 is used to selectively energize or de-energize the secondary side 132. The control circuit 300 includes a signal generation unit 400 and a logic control unit 500. The signal generation unit 400 is used to output a conduction signal 630 according to a preset pulse signal 610. The preset pulse signal 610 has a first level and a second level. The conduction signal 630 has a third level and a fourth level. When the level of the preset pulse signal 610 changes to the first level, the level of the conduction signal 630 changes from the third level to the fourth level after a preset duration Ta. When the level of the preset pulse signal 610 changes to the second level, the level of the conduction signal 630 changes from the fourth level to the third level. The logic control unit 500 outputs a shutdown signal 640 based on the preset pulse signal 610 and the conduction signal 630. The shutdown signal 640 controls the first conducting element 110 to remain off for a preset duration Ta so that the primary side 131 is de-energized. The preset duration Ta is greater than or equal to the duration for which the second conducting element 120 remains on so that the secondary side 132 is energized.

[0056] The aforementioned control circuit 300 includes a shutdown signal 640 that changes level when the preset pulse signal 610 changes to a first level and maintains this level for a preset duration Ta. Based on the level change of the shutdown signal 640, the first conducting element 110 can be controlled to remain off for the preset duration Ta. During the process of the second conducting element 120 being turned on to energize the secondary side 132, the first conducting element 110 is prevented from turning on again, thus helping to avoid the problem of machine failure due to accidental activation.

[0057] Specifically, please refer to Figure 1 In one embodiment, when the preset pulse signal 610 outputs a second high level and a first low level, the turn-on signal 630 outputs a fourth high level after a preset duration Ta. The logic control unit 500 outputs a low-level turn-off signal 640 and maintains the turn-off signal 640 from being set to a high level for the preset duration Ta. When the preset pulse signal 610 outputs a second high level and a first low level, the turn-on signal 630 outputs a third low level. The logic control unit 500 outputs a high-level turn-off signal 640.

[0058] Additionally, please see Figure 2In one embodiment, when the preset pulse signal 610 output changes from a low level (first level) to a high level (second level), the shutdown signal 640 maintains its current level. The first conducting element 110 is turned on to energize the primary side 131. When the preset pulse signal 610 output changes from a high level (second level) to a low level (first level), the shutdown signal 640 changes from low to high and maintains this high level for a preset duration Ta, while the first conducting element 110 is turned off to de-energize the primary side 131. The second conducting element 120 is turned on to energize the secondary side 132. The second conducting element 120 has a secondary conduction duration Tb. The second conducting element 120 will not be turned off during the secondary conduction duration Tb. Energizing the primary side 131 during the secondary conduction duration Tb would cause the primary side 131 voltage to become too high, resulting in damage to electrical components. By configuring the control circuit 300, within a preset time Ta during which the shutdown signal 640 transitions from a low level to a high level, the shutdown signal 640 will not be set to a high level again, the first conducting element 110 will not conduct, and the primary side 131 will not be energized. Since the preset time Ta is greater than or equal to the secondary conduction time Tb, the power adapter device 100 can prevent the primary side 131 and the secondary side 132 from being energized simultaneously and causing a machine failure.

[0059] It is understood that, based on the implementation principles shown in the embodiments of the present invention, those skilled in the art can, according to specific application requirements, set the first and third levels to high levels, and the second and fourth levels to low levels. The first level corresponds to the fourth level and corresponds to the low-level shutdown signal 640. The second level corresponds to the third level and corresponds to the high-level shutdown signal 640; to avoid redundancy, this will not be elaborated further here.

[0060] Please see Figure 3 and Figure 4 In some embodiments, the signal generation unit 400 includes a first control subunit 410 and a second control subunit 420. The first control subunit 410 is used to output a ramp signal 620 according to a preset pulse signal 610. When the level of the preset pulse signal 610 changes to a first level, the voltage value of the ramp signal 620 increases sequentially. When the level of the preset pulse signal 610 changes to a second level, the voltage value of the ramp signal 620 decreases instantaneously. The second control subunit 420 is connected to the first control subunit 410. The second control subunit 420 is used to output a conduction signal 630 according to the ramp signal 620, and to make the level change of the conduction signal 630 correspond to the level change of the ramp signal 620.

[0061] This allows for a delay in signal changes.

[0062] Specifically, please refer to Figure 3In one embodiment, the first control subunit 410 receives a preset pulse signal 610 and outputs a ramp signal 620. The second control subunit 420 receives the ramp signal 620 and outputs a conduction signal 630. Please refer to [link to relevant documentation]. Figure 4 When the preset pulse signal 610 output changes from the first level to the second level, the voltage value of the ramp signal 620 decreases instantaneously and remains at a small value. The second control subunit 420 outputs a low-level conduction signal 630. When the preset pulse signal 610 output changes from the second level to the first level, the voltage value of the ramp signal 620 increases sequentially. When the voltage value of the ramp signal 620 is lower than the preset voltage, the second control subunit 420 outputs a low-level conduction signal 630. When the voltage value of the ramp signal 620 is higher than the preset voltage, the second control subunit 420 outputs a high-level conduction signal 630. Therefore, there is a delay between the change of the preset pulse signal 610 from high to low and the change of the conduction signal 630. The duration of the delay corresponds to a preset duration Ta.

[0063] This is understandable; please refer to [link / reference]. Figure 4 In one embodiment, when the voltage value of the preset pulse signal 610 is large, corresponding to U 1-H That is, a high level. When the voltage value of the preset pulse signal 610 is relatively small, it corresponds to U. 1-L This corresponds to a low level. When the voltage value of ramp signal 620 is large, it corresponds to U 2-H When the voltage value of ramp signal 620 is relatively small, corresponding to U 2-L .

[0064] Please see Figure 3 In some embodiments, the first control subunit 410 includes a third conducting element 411 and a first energy storage element 412. The third conducting element 411 is used to selectively turn on or off the first point 414 and the second point 415 according to the current level of the preset pulse signal 610. The two ends of the first energy storage element 412 are respectively connected to the first point 414 and the second point 415. The first energy storage element 412 is used to increase the voltage value of the first point 414 sequentially by storing energy when the third conducting element 411 turns off the first point 414 and the second point 415. The signal generation unit 400 is connected to the second control subunit 420 through the first point 414.

[0065] In this way, the delay change of the voltage can correspond to the delay change of the signal.

[0066] Specifically, please refer to Figure 3In one embodiment, the third conducting element 411 is connected to the first point 414 and the second point 415. The first energy storage element 412 is connected to the first point 414 and the second point 415. The first point 414 is connected to the second control subunit 420. The second point 415 is grounded. When the output of the preset pulse signal 610 changes from the first level to the second level, the third conducting element 411 is turned on. The second point 415 is connected to the first point 414 and grounded, and its voltage value decreases instantaneously. The first energy storage element 412 discharges at this time. When the output of the preset pulse signal 610 changes from the second level to the first level, the third conducting element 411 is turned off. The first energy storage element 412 begins to charge, and the voltage value at its two ends gradually increases. The first point 414 is connected to one end of the first energy storage element 412, and its voltage increases as the first energy storage element 412 charges. The voltage of the first point 414 corresponds to the voltage of the ramp signal 620. Therefore, the first control subunit 410 can output the internal voltage change as a ramp signal 620 change, and transmit the ramp signal 620 to the second control subunit 420.

[0067] Please see Figure 3 In some embodiments, the first control subunit 410 includes a constant current subunit 413. The constant current subunit 413 is connected to a first point 414 and is used to provide a preset current to the path connected to the first point 414.

[0068] This helps to provide a stable voltage change effect.

[0069] Specifically, please refer to Figure 3 In one embodiment, the constant current subunit 413 is connected to the first point 414 and provides a preset current to the path connected to the first point 414. When the preset pulse signal 610 is output at a first level, the constant current subunit 413 can stably charge the first energy storage device 412. Thus, the voltage value corresponding to the ramp signal 620 can be stably increased to achieve a delayed change in the ramp signal 620.

[0070] Please see Figure 3 and Figure 4 In some embodiments, the second control subunit 420 includes a threshold conduction section 421. The second control subunit 420 is connected to the first control subunit 410 via the threshold conduction section. The threshold conduction section is used to output a conduction signal 630 at a fourth level when the voltage value of the ramp signal 620 is greater than the flip threshold, and to output a conduction signal 630 at a third level when the voltage value of the ramp signal 620 is less than the flip threshold.

[0071] In this way, the voltage of the ramp signal 620 can be converted into a level.

[0072] Specifically, please refer to Figure 3The threshold conduction unit 421 is connected to the first control subunit 410 and receives a ramp signal 620 as input. The threshold conduction unit 421 is also connected to the logic control unit 500 and outputs a conduction signal 630. (See also...) Figure 4 When the voltage value of the ramp signal 620 decreases instantaneously and remains at a low value, the conduction signal 630 is at the third level. When the voltage value of the ramp signal 620 increases sequentially and falls below the toggling threshold, the conduction signal 630 is at the third level. When the voltage value of the ramp signal 620 increases sequentially and rises above the toggling threshold, the conduction signal 630 is at the fourth level.

[0073] Please see Figure 3 In some embodiments, the threshold conduction unit 421 includes a first logic element 422 and a second logic element 423. The first logic element 422 is connected to the first control subunit 410 and is used to output a signal with a third or fourth level based on the ramp signal 620 and the threshold switching. The second logic element 423 is connected to the first logic element 422 and is used to flip the level of the signal output by the first logic element 422 so that the level changes of the conduction signal 630 and the ramp signal 620 are logically in the same direction. Here, logically in the same direction can be understood as the conduction signal 630 and the ramp signal 620 being both high or both low.

[0074] In this way, the signal can be transmitted to the logic control unit 500.

[0075] Specifically, please refer to Figure 3 The first logic element 422 is connected to the first control element and receives a ramp signal 620. When the voltage value of the ramp signal 620 is greater than the switching voltage, the first logic element 422 outputs a low level. When the voltage value of the ramp signal 620 is less than the switching voltage, the first logic element 422 outputs a high level. The second logic element 423 is connected to the first logic element 422 and the logic control unit 500, and outputs a conduction signal 630. When the first logic element 422 outputs a low level, the conduction signal 630 is at the fourth level. When the first logic element 422 outputs a high level, the conduction signal 630 is at the third level.

[0076] Please see Figure 3 and Figure 5 In some embodiments, the logic control unit 500 includes a third logic element 510. The third logic element 510 is configured to output a shutdown signal 640 at a sixth level when the level of the preset pulse signal 610 is a first level and the level of the on signal 630 is a third level; and to output a shutdown signal 640 at a fifth level when the level of the preset pulse signal 610 is a second level and / or the level of the on signal 630 is a fourth level.

[0077] In this way, a delay signal with a preset duration Ta can be obtained.

[0078] For details, please refer to Figure 3 In one embodiment, the input terminal of the third controller includes a conduction signal 630 and a preset pulse signal 610. The third controller outputs a shutdown signal 640. See also... Figure 5 The third control element is a NOR gate. When the preset pulse signal 610 is at the first level and the on signal 630 is at the third level, the off signal 640 is at the sixth level (high). When the preset pulse signal 610 is at the second level and / or the on signal 630 is at the fourth level, the off signal 640 is at the fifth level (low). It can be understood that the off signal 640 is high and maintained for a preset duration Ta only when the output of the preset pulse signal 610 changes from the second level to the first level.

[0079] Further, please refer to Figure 5 When the voltage value of the conduction signal 630 is large, the corresponding U 3-H That is, a high level. When the voltage value of the conduction signal 630 is small, it corresponds to U 3-L That is, a low level. When the voltage value of the turn-off signal 640 is large, it corresponds to U. 4-H That is, a high level. When the voltage value of the turn-off signal 640 is small, it corresponds to U 4-L That is, low level.

[0080] It is understood that, based on the implementation principles shown in the embodiments of the present invention, those skilled in the art can set the fifth level to a high level and the sixth level to a low level according to specific application requirements. To avoid redundancy, this will not be elaborated further here.

[0081] Please see Figure 1 A control chip 200 according to an embodiment of the present invention is used in a power adapter device 100. The control chip 200 includes a control circuit 300 and a shutdown control unit 230 as described in any of the above embodiments. The shutdown control unit 230 is connected to the control circuit 300 and a first conducting element 110. The shutdown control unit 230 is used to control the first conducting element 110 to remain disconnected for a preset duration Ta according to a preset pulse signal 610 and a shutdown signal 640, so that the primary side 131 is de-energized.

[0082] The aforementioned control chip 200's shutdown signal 640 changes level accordingly when the preset pulse signal 610 changes to the first level and maintains this level for a preset duration Ta. Based on the level change of the shutdown signal 640, the first conducting element 110 can be controlled to remain off for the preset duration Ta. During the process of the second conducting element 120 being turned on to energize the secondary side 132, the first conducting element 110 can be prevented from turning on again, thus helping to avoid the problem of machine failure due to accidental activation.

[0083] Specifically, please refer to Figure 1 and Figure 2 When the shutdown signal 640 is at the sixth level and the preset pulse signal 610 is at the second level, the shutdown signal 640 is at the fifth level, and the first conducting element 110 is turned on to energize the primary side 131. When the shutdown signal 640 is at the sixth level and the preset pulse signal 610 is at the first level, the first conducting element 110 is turned off to de-energize the primary side 131. When the shutdown signal 640 is at the sixth level, the first conducting element 110 remains off and is not affected by the preset pulse signal 610. Thus, when the shutdown signal 640 is at the sixth level and the preset pulse signal 610 is at the first level, the secondary side 132 reaches the secondary conduction duration Tb. When the preset pulse signal 610 abruptly goes high, the second conducting element 120 can respond in time to disconnect the secondary side 132, thereby preventing a system crash.

[0084] In another embodiment, the first conducting element 110 is a MOSFET, and the output terminal of the turn-off control unit 230 is connected to the gate of the first conducting element 110. The turn-off control unit 230 can output a drive signal 650 according to a preset pulse signal 610 and a turn-off signal 640, and can send the drive signal 650 to the gate of the first conducting element 110, thereby controlling the source and drain of the first conducting element 110 to be turned on or off.

[0085] Please see Figure 1 In some embodiments, the control chip 200 includes a pulse generation circuit 220 and a voltage detection terminal 210. The pulse generation circuit 220 is used to generate a preset pulse signal 610. The voltage detection terminal 210 is connected to the pulse generation circuit 220 and the first conducting element 110, and is used to feed back the circuit current of the primary side 131 when it is energized to the pulse generation circuit 220, so that the pulse generation circuit 220 adjusts the preset pulse signal 610.

[0086] Thus, adjustments can include the duration of the high level and the duration of the low level.

[0087] Specifically, please refer to Figure 1 In one embodiment, a pulse generating circuit 220 generates a preset pulse signal 610. The pulse generating circuit 220 is connected to the control circuit 300 and the shutdown control unit 230. The preset pulse signal 610 controls the first conducting element 110 to be turned on or off. A voltage detection terminal 210 detects the voltage on the primary side 131. When excessive circuit current is detected, a signal is output to the pulse generating circuit 220 to change the preset pulse signal 610, thereby turning off the first conducting element 110. This prevents damage to electrical components due to excessive circuit current.

[0088] Please see Figure 2 Figure 2A power adapter device 100 according to an embodiment of the present invention includes a transformer section 130, a first conductive element 110, a second conductive element 120, and a control chip 200 according to any of the above embodiments. The transformer section 130 has a primary side 131 and a secondary side 132. The primary side 131 is used to connect to a power supply terminal 140. The secondary side 132 is used to connect to a device 150 to be charged. The first conductive element 110 is used to selectively energize or de-energize the primary side 131. The second conductive element 120 is used to selectively energize or de-energize the secondary side 132. The control chip 200 is used to control the first conductive element 110 to be turned on or off.

[0089] The aforementioned power adapter 100 has a shutdown signal 640 that changes level when the preset pulse signal 610 changes to a first level and maintains this level for a preset duration Ta. Based on the level change of the shutdown signal 640, the first conducting element 110 can be controlled to remain disconnected for the preset duration Ta. During the process of the second conducting element 120 being turned on to power the secondary side 132, the first conducting element 110 can be prevented from turning on again, thus helping to avoid the problem of machine failure due to accidental activation.

[0090] Specifically, please refer to section 2. When the preset pulse signal 610 is at its second level, the control chip 200 controls the first conducting element 110 to conduct, energizing the primary side 131. The second conducting element 120 is de-energized to de-energize the secondary side 132. The power supply terminal 140 charges the transformer section 130. When the preset pulse signal 610 is at its first level, the control chip 200 controls the first conducting element 110 to de-energize, de-energizing the primary side 131. The second conducting element 120 is turned on to turn on the secondary side 132. The transformer section 130 charges the device 150 to be charged. The second conducting element 120 has a secondary conduction duration Tb. During the secondary conduction duration Tb, when the first conducting element 110 is turned on, the second conducting element 120 will not be de-energized in time. By setting the control chip 200, it can be ensured that the first conductor 110 will not be turned on during the secondary conduction time Tb when the second conductor 120 is turned on to turn on the secondary side 132, thereby avoiding the machine crash.

[0091] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0092] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0093] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, and they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0094] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A control circuit for a power adapter device, characterized in that, The power adapter includes a transformer section, a first conductive element, and a second conductive element. The transformer section has a primary side and a secondary side. The first conductive element is used to selectively energize or de-energize the primary side, and the second conductive element is used to selectively energize or de-energize the secondary side. The control circuit includes: A signal generation unit is configured to output a conduction signal based on a preset pulse signal. The preset pulse signal has a first level and a second level, and the conduction signal has a third level and a fourth level. When the level of the preset pulse signal changes to the first level, the level of the conduction signal changes from the third level to the fourth level after a preset duration. When the level of the preset pulse signal changes to the second level, the level of the conduction signal changes from the fourth level to the third level. A logic control unit is configured to output a shutdown signal based on the preset pulse signal and the turn-on signal. The shutdown signal is configured to control the first conducting element to remain disconnected for the preset duration so that the primary side is de-energized. The preset duration is greater than or equal to the duration for which the second conducting element remains on so that the secondary side is energized.

2. The control circuit according to claim 1, characterized in that, The signal generation unit includes: A first control subunit is configured to output a ramp signal based on the preset pulse signal. When the level of the preset pulse signal changes to the first level, the voltage value of the ramp signal increases sequentially; when the level of the preset pulse signal changes to the second level, the voltage value of the ramp signal decreases instantaneously. A second control subunit is connected to the first control subunit. The second control subunit is used to output the turn-on signal according to the ramp signal, and to make the level change of the turn-on signal correspond to the level change of the ramp signal.

3. The control circuit according to claim 2, characterized in that, The first control subunit includes: The third conducting element is used to selectively turn on or off the first and second points according to the current level of the preset pulse signal; and The first energy storage device has its two ends connected to the first point and the second point, respectively. The first energy storage device is used to increase the voltage value of the first point sequentially by storing energy when the third conducting device disconnects the first point and the second point. The signal generation unit is connected to the second control subunit through the first point.

4. The control circuit according to claim 3, characterized in that, The first control subunit includes: A constant current subunit, connected to the first point, is used to provide a preset current to the path connected to the first point.

5. The control circuit according to claim 2, characterized in that, The second control subunit includes: The threshold conduction section connects the second control subunit to the first control subunit via a threshold conduction element. The threshold conduction element is used to output the conduction signal at the fourth level when the voltage value of the ramp signal is greater than the flip threshold, and to output the conduction signal at the third level when the voltage value of the ramp signal is less than the flip threshold.

6. The control circuit according to claim 5, characterized in that, The threshold conduction section includes: A first logic element, connected to the first control subunit, is used to output a signal with a level of the third level or the fourth level based on the ramp signal and the flip threshold; and The second logic element, connected to the first logic element, is used to flip the level of the signal output by the first logic element so that the level changes of the conduction signal and the ramp signal are in the same logical direction.

7. The control circuit according to claim 1, characterized in that, The logic control unit includes: The third logic element is configured to output the shutdown signal at a sixth level when the level of the preset pulse signal is the first level and the level of the conduction signal is the third level, and to output the shutdown signal at a fifth level when the level of the preset pulse signal is the second level and / or the level of the conduction signal is the fourth level.

8. A control chip for a power adapter device, characterized in that, The control chip includes: The control circuit according to any one of claims 1-7; and A shutdown control unit is connected to the control circuit and the first conducting element. The shutdown control unit is used to control the first conducting element to remain disconnected for the preset duration according to the preset pulse signal and the shutdown signal so that the primary side is de-energized.

9. The control chip according to claim 8, characterized in that, The control chip includes: A pulse generation circuit is used to generate the preset pulse signal; and The voltage detection terminal is connected to the pulse generation circuit and the first conducting element, and is used to feed back the circuit current of the primary side when it is energized to the pulse generation circuit, so that the pulse generation circuit can adjust the preset pulse signal.

10. A power adapter device, characterized in that, include: The transformer section has a primary side and a secondary side, wherein the primary side is used to connect to the power supply terminal and the secondary side is used to connect to the device to be charged; A first conductive element is used to selectively energize or de-energize the primary side; The second conductive element is used to selectively energize or de-energize the secondary side. and The control chip according to any one of claims 8-9, wherein the control chip is used to control the first conductive element to be turned on or off.

Images