A charger

Abstract

The embodiment of the present application relates to the technical field of electronic equipment, and discloses a charger, including a control unit, a short circuit detection unit, a transformer unit and a switch unit, wherein: the control unit is used to send a first transformer signal to the transformer unit when detecting that the device to be charged is connected; and the transformer unit is used to transform the voltage provided by the power supply to obtain a first voltage according to the first transformer signal sent by the control unit, and the first voltage is less than the minimum charging voltage of the device to be charged; the short circuit detection unit is used to collect the operation data of the transformer unit under the action of the first voltage, and feed the operation data back to the control unit; and the control unit is also used to control the switch unit to disconnect when determining that the charger is short-circuited according to the operation data so that the transformer unit no longer outputs voltage to the device to be charged. Implementing the above charger can improve the safety of the charger charging process of electronic devices.

Description

Technical Field

[0001] The present application relates to the technical field of electronic equipment, and in particular to a charger. Background Art

[0002] With the rapid development of electronic equipment technology, many electronic devices are moving towards miniaturization and lightness. However, due to the limited internal space, the batteries configured in miniaturized electronic devices have small capacities, which results in users having to charge the electronic devices frequently.

[0003] In practice, it is found that the conventional chargers used to charge electronic devices today are usually unable to take effective safety measures when a short circuit occurs, which results in damage to the electronic device or charger at the least, or even a fire at the worst. Therefore, how to improve the safety of the charger during the charging process has become an urgent problem to be solved. Summary of the invention

[0004] The embodiment of the present application discloses a charger, which can improve the safety of the charging process of the charger for an electronic device.

[0005] In a first aspect, an embodiment of the present application discloses a charger, characterized in that it includes a control unit, a short circuit detection unit, a voltage transformation unit and a switch unit, wherein the control unit is electrically connected to the short circuit detection unit, the voltage transformation unit and the switch unit respectively, and the voltage transformation unit is also electrically connected to the short circuit detection unit and the switch unit respectively, wherein:

[0006] The control unit is configured to send a first voltage transformation signal to the voltage transformation unit when detecting that a device to be charged is connected;

[0007] The voltage transformation unit is also electrically connected to the power supply, and is used to transform the voltage provided by the power supply to obtain a first voltage according to the first voltage transformation signal sent by the control unit, and output the first voltage to the charging circuit of the device to be charged, wherein the first voltage is less than the minimum charging voltage of the device to be charged, and the short circuit detection unit is connected in series to the charging circuit;

[0008] The control unit is further used to obtain operating data of the short-circuit detection unit under the action of the first voltage, and when it is determined that the charger is short-circuited according to the operating data, control the switch unit to be disconnected so that the transformer unit no longer outputs voltage to the device to be charged.

[0009] As an optional implementation, in the first aspect of the embodiments of the present application, the charger further includes a device to be charged detection unit, which is electrically connected to the control unit and is used to detect whether there is a device to be charged connected to the charger.

[0010] As an optional implementation, in the first aspect of the embodiments of the present application, the device to be charged detection unit includes a ground pin and an identity pin in the interface of the charger, and the control unit is also used to determine that there is a device to be charged connected to the charger when it is detected that the ground pin and the identity pin are short-circuited.

[0011] As an optional implementation, in the first aspect of the embodiments of the present application, the device to be charged detection unit includes a power pin and an identity pin in the interface of the charger, and the control unit is also used to determine that there is a device to be charged connected to the charger when it is detected that the power pin and the identity pin are short-circuited.

[0012] As an optional implementation, in the first aspect of the embodiment of the present application, the charger further includes an output port, the output port is electrically connected to the voltage transformation unit and the control unit respectively, and the output port is used to output a charging current to charge the device to be charged when the voltage generated by the voltage transformation unit is greater than or equal to the minimum charging voltage of the device to be charged;

[0013] The control unit is further configured to determine that a device to be charged is connected to the charger when it is detected that the output port outputs the charging current.

[0014] As an optional implementation, in the first aspect of the embodiment of the present application, the switching unit includes a MOS tube, a gate of the MOS tube is electrically connected to the control unit, a drain of the MOS tube and a source of the MOS tube are respectively electrically connected to the transformer unit, and the control unit is further used to send a first control voltage to the gate of the MOS tube to turn off the MOS tube when it is determined according to the operating data that the charger is short-circuited, and the first control voltage is less than the turn-on voltage of the MOS tube.

[0015] As an optional implementation, in the first aspect of the embodiment of the present application, the short-circuit detection unit includes a current detection resistor, which is electrically connected to the control unit and the transformer unit respectively, and the current detection resistor is used to collect the real-time current of the transformer unit, and the real-time current is used to enable the control unit to determine whether the charger is short-circuited based on the real-time current.

[0016] As an optional implementation, in the first aspect of the embodiment of the present application, the short-circuit detection unit includes a temperature detection resistor, which is electrically connected to the control unit and the transformer unit, respectively, and the temperature detection resistor is used to collect the real-time temperature of the transformer unit, and the real-time temperature is used to enable the control unit to determine whether the charger is short-circuited based on the real-time temperature.

[0017] As an optional implementation, in the first aspect of the embodiment of the present application, the control unit is used to send a second voltage transformation signal to the voltage transformation unit before detecting that the device to be charged is connected;

[0018] The voltage transformation unit is used to transform the voltage provided by the power supply to obtain a second voltage according to the second voltage transformation signal sent by the control unit, and the second voltage is less than the minimum charging voltage of the device to be charged.

[0019] As an optional implementation manner, in the first aspect of the embodiment of the present application, the control unit is further configured to send a third voltage transformation signal to the voltage transformation unit when it is determined according to the operation data that the charger is not short-circuited;

[0020] The transformer unit is further used to transform the voltage provided by the power supply to obtain a third voltage according to the third transformation signal sent by the control unit, and output the third voltage to the device to be charged, wherein the third voltage is greater than or equal to the minimum charging voltage of the device to be charged.

[0021] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0022] With the charger disclosed in the embodiment of the present application, since the control unit inside it can change the output voltage of the charger through the transformer circuit, the control unit can control the transformer circuit to only generate a first voltage that is less than the minimum charging voltage of the device to be charged when it is connected to the device to be charged. At this time, the charger will not charge the device to be charged, thereby forming a charging protection period. During this protection period, the control unit can control the short-circuit detection unit to perform a short-circuit self-check on the charger, and when it is determined that the charger has a short circuit, control the switch unit to close to prohibit the charger from outputting voltage, thereby avoiding a short circuit in the charger during the charging process, which may cause damage to the device or even cause a fire, thereby improving the safety of the charging process of the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 is a schematic diagram of the structure of a charger disclosed in an embodiment of the present application;

[0025] Figure 2is a structural schematic diagram of another charger disclosed in an embodiment of the present application;

[0026] Figure 3 It is a schematic diagram of an improved structure of a female socket of a charger interface disclosed in an embodiment of the present application;

[0027] Figure 4 It is a schematic diagram of an improved structure of a female socket of another charger interface disclosed in an embodiment of the present application;

[0028] Figure 5 This is a schematic diagram of the internal circuit of a charger disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] It should be noted that the terms "first", "second", "third" and "fourth" in the specification and claims of the present application are used to distinguish different objects rather than to describe a specific order. The terms "including" and "having" in the embodiments of the present application and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device including a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] The embodiment of the present application discloses a charger, which can improve the safety of the charging process of the charger for an electronic device.

[0032] The technical solution of the present application will be described in detail below in conjunction with specific embodiments.

[0033] See also Figure 1 , Figure 1 1 is a schematic diagram of a charger disclosed in an embodiment of the present application. The charger may include a control unit 101, a short circuit detection unit 102, a transformer unit 103 and a switch unit 104. The control unit 101 is electrically connected to the short circuit detection unit 102, the transformer unit 103 and the switch unit 104 respectively. The transformer unit 130 is also electrically connected to the short circuit detection unit 102 and the switch unit 104 respectively.

[0034] The control unit 101 is used to send a first voltage transformation signal to the voltage transformation unit 103 when detecting that a device to be charged (such as a mobile phone, a tablet computer, a smart watch or other electronic device) is connected.

[0035] Optionally, the control unit 101 may include components with logic control and logic operations such as a control chip and a single-chip microcomputer to implement functions such as component control and short circuit detection in the charger.

[0036] The transformer unit 103 is also electrically connected to a power source (e.g., household 220V AC power, battery, generator, etc.), and is used to transform the voltage provided by the power source to obtain a first voltage according to the first transformer signal sent by the control unit 101, and output the first voltage to the charging circuit of the device to be charged, wherein the first voltage is less than the minimum charging voltage of the device to be charged, and the short circuit detection unit 102 is connected in series to the charging circuit; (wherein, the minimum charging voltage of different types of devices to be charged may be different; optionally, the minimum charging voltage of different types of devices to be charged may be obtained through identification information (e.g., production code, product name, etc.), instructions, etc. of the device to be charged);

[0037] The control unit 101 is also used to obtain operating data (for example, current, voltage or temperature, etc.) of the short-circuit detection unit 102 under the action of the first voltage, and when it is determined that the charger is short-circuited according to the operating data, control the switch unit 104 to disconnect so that the transformer unit 103 no longer outputs voltage to the device to be charged.

[0038] It should be noted that the charger may include charging devices such as a charging head or a socket strip. In addition, when the control unit 101 detects that the device to be charged is connected, it controls the voltage transformation unit 103 to transform the voltage provided by the power supply into the first voltage because the device to be charged usually requires the input charging voltage to reach a certain voltage threshold (i.e., the minimum charging voltage) before charging. Therefore, when the first voltage is less than the minimum charging voltage of the device to be charged, the charger does not charge the device to be charged. For example, if the minimum charging voltage of the device to be charged is 3V, the first voltage may be 2.5V, 2V, etc. Then, the charger can use the characteristic of not charging the device to be charged when the output voltage is low to form a charging protection period during the charging process, and then perform a short-circuit self-check during this protection period to avoid accidents caused by using a short-circuited charger to charge the device to be charged.

[0039] In the charger disclosed in the above embodiment, since the control unit inside the charger can change the output voltage of the charger through the transformer unit, the control unit can control the transformer circuit to only generate a first voltage less than the minimum charging voltage of the device to be charged when the device to be charged is connected. At this time, the charger will not charge the device to be charged, thereby forming a charging protection period. During this protection period, the control unit can control the short-circuit detection unit to perform a short-circuit self-check on the charger, and when it is determined that the charger has a short circuit, control the switch unit to close to prohibit the charger from outputting voltage, thereby avoiding a short circuit in the charger during the charging process, which may cause damage to the device or even cause a fire, thereby improving the safety of the charging process of the electronic device.

[0040] As an optional implementation, the control unit 101 can be used to send a second transformation signal to the transformation unit 103 before detecting that the device to be charged is connected; and the transformation unit 103 can also be used to transform the voltage provided by the power supply according to the second transformation signal sent by the control unit 101 to obtain a second voltage, which is lower than the minimum charging voltage of the device to be charged.

[0041] It should be noted that: before detecting that the device to be charged is connected, the control unit 101 controls the charger in advance to output only a second voltage that is lower than the minimum charging voltage of the device to be charged, so that the device to be charged is short-circuit protected as soon as it is connected to the charger, thereby reducing the risk of damage to the device to be charged.

[0042] Please read further Figure 2 As an optional implementation, the charger may further include a device to be charged detection unit 105, which may be electrically connected to the control unit 101 and configured to detect whether there is a device to be charged connected to the charger.

[0043] Optionally, the device to be charged detection unit 105 may include a ground pin (GND) and an identity pin (ID) in the female socket of the charger interface (eg Figure 3 As shown in FIG. 1 , the identification pin may be a part separated from the ground pin, or a pin newly added to the interface. It is not connected to the ground pin, and when the plug of the device to be charged is inserted into the interface of the charger, the plug pin of the plug may short-circuit the ground pin and the identification pin. By utilizing this structural feature, the control unit 101 may also be used to determine that there is a device to be charged connected to the charger when the ground pin and the identification pin are short-circuited.

[0044] It should be noted that: Figure 3 The VBUS in the DAC includes the power pin in the charger interface.

[0045] As another optional implementation, the device to be charged detection unit 105 may also include a power pin (VBUS) and an identity pin (ID) in the female socket of the charger interface (eg Figure 4 As shown). Similarly, the identity pin can be a part separated from the power pin, or a pin newly added to the interface, and then when the plug of the device to be charged is inserted into the interface of the charger, the plug of the plug can short-circuit the power pin and the identity pin, so that the level of the identity pin is equal to the level of the power pin. Based on this structural feature, the control unit 101 can also be used to determine that there is a device to be charged connected to the charger when it is detected that the power pin and the identity pin are short-circuited; or the control unit 101 can also be used to determine that there is a device to be charged connected to the charger when it is detected that the level of the identity pin is equal to the level of the power pin.

[0046] It should be noted that: Figure 4 The GND in includes the ground pin in the charger interface.

[0047] It needs to be further explained that: since the charger usually outputs a charging current to the device to be charged when charging the device to be charged normally, the charger can determine whether a device to be charged is connected by detecting whether a charging current is output to the device to be charged. However, in order to reduce the risk of damage to the device to be charged, before the device to be charged is connected to the charger, the charger is controlled to only output a second voltage that is less than the minimum charging voltage of the device to be charged. At this time, no charging current is output from the charger, so it is impossible to determine whether a device to be charged is connected by detecting whether a charging current is output to the device to be charged. Based on this, the above-mentioned charger can be implemented according to the structural characteristics that when the plug is inserted into the interface of the charger, the plug of the plug can short-circuit the ground pin and the identification pin, or short-circuit the power pin and the identification pin, so that the control unit can determine whether a device to be charged is connected by detecting whether the ground pin and the identification pin are short-circuited, or whether the power pin and the identification pin are short-circuited, thereby solving the problem that when the charger has no charging current output, it is impossible to determine whether a device to be charged is connected by the charging current.

[0048] As an optional implementation, the charger may further include an output port, which may be electrically connected to the transformer unit 103 and the control unit 101, respectively, and the output port is used to output a charging current to charge the device to be charged when the voltage generated by the transformer unit 103 is greater than or equal to the minimum charging voltage of the device to be charged;

[0049] Furthermore, the control unit 101 may also be configured to determine that a device to be charged is connected to the charger when detecting that the output port outputs a charging current.

[0050] It should be noted that before the control unit 101 detects that the device to be charged is connected, it can usually control the transformer unit 103 to generate a voltage greater than or equal to the minimum charging voltage of the device to be charged, so that when the device to be charged is connected to the charger, the charger will charge the device to be charged, that is, the output port will output a charging current. Based on this, the above-mentioned charger can use whether the output port has a charging current output to determine whether the device to be charged is connected to the charger, so there is no need to modify the charger interface to detect whether the device to be charged is connected, which reduces the manufacturing difficulty and cost of the charger.

[0051] As an optional implementation, the switch unit 104 may include a MOS tube (for example, a P-channel MOS tube or an N-channel MOS tube, etc.), the gate of the MOS tube may be electrically connected to the control unit 101, and the drain of the MOS tube and the source of the MOS tube may be electrically connected to the transformer unit 103. Furthermore, the control unit 101 is further configured to send a first control voltage to the gate of the MOS tube to turn off the MOS tube when it is determined that the charger is short-circuited according to the operation data of the transformer unit 103.

[0052] It should be noted that the above-mentioned MOS tube can be an N-channel MOS tube, which is cheap and suitable for configuration in mass-produced chargers. The gate of the N-channel MOS tube is turned on when it receives a control voltage greater than or equal to its turn-on voltage (for example, 4V, 6V, etc.); on the contrary, the gate of the N-channel MOS tube is turned off when it receives a control voltage less than its turn-on voltage. Then, when determining that the charger is short-circuited, the control unit 101 can send a first control voltage less than the turn-on voltage of the MOS tube to the gate of the MOS tube to turn off the MOS tube, thereby preventing the device to be charged from being damaged by charging with a short-circuited charger.

[0053] As an optional implementation, the short circuit detection unit 102 may include a current detection resistor, which may be electrically connected to the control unit 101 and the transformer unit 103, respectively, so that the current detection resistor can collect the real-time current of the transformer unit 103 (optionally, the real-time current may be equal to the voltage difference across the current detection resistor divided by the resistance value of the current detection resistor), and feed back the real-time current of the transformer unit 103 to the control unit 101; furthermore, the control unit 101 may determine whether the charger is short-circuited based on the real-time current of the transformer unit 103.

[0054] Optionally, after receiving the real-time current of the transformer unit 103, the control unit 101 can determine whether the real-time current of the transformer unit 103 is less than a preset current threshold within a preset first time period (for example: 1 second, 2 seconds, etc., not limited here); if the real-time current of the transformer unit 103 is less than the preset current threshold within the preset first time period, it is determined that there is no short circuit in the charger; if there is a moment when the real-time current of the transformer unit 103 is greater than or equal to the preset current threshold within the first time period, it is determined that there is a short circuit in the charger.

[0055] Among them, the preset current threshold can be set by the developer based on a large amount of development data, which represents the current of the internal circuit of the charger, the critical value between the short-circuit state and the non-short-circuit state, and its typical values ​​may include: 200mA, 300mA, etc., which are not limited here.

[0056] By implementing the above charger, the control unit can determine whether the charger is short-circuited by the current value fed back by the current detection resistor. Since the current detection resistor is cheap and the method of determining the short circuit by the current value is relatively simple, the cost of the charger is reduced.

[0057] As an optional implementation, the short circuit detection unit 102 may include a temperature detection resistor (for example: an NTC thermistor, a PTC thermistor, etc., not limited here), and the temperature detection resistor may be electrically connected to the control unit 101 and the transformer unit 103 respectively, so that the temperature detection resistor can collect the real-time temperature of the transformer unit 103 and feed back the real-time temperature of the transformer unit 103 to the control unit 101; and then the control unit 101 can determine whether the charger is short-circuited according to the real-time temperature of the transformer unit 103.

[0058] Optionally, after receiving the real-time temperature of the transformer unit 103, the control unit 101 can determine whether the real-time temperature of the transformer unit 103 is lower than a preset temperature threshold within a preset second time period (for example: 1 second, 2 seconds, etc., not limited here); if the real-time temperature of the transformer unit 103 is lower than the preset temperature threshold within the preset second time period, it is determined that there is no short circuit in the charger; if there is a moment when the real-time temperature of the transformer unit 103 is greater than or equal to the preset temperature threshold within the second time period, it is determined that there is a short circuit in the charger.

[0059] The preset temperature threshold may be set by developers based on a large amount of development data, and typical values ​​thereof may include 50° C., 60° C., etc., which are not limited here.

[0060] By implementing the above method, the control unit can determine whether the charger is short-circuited by the charger temperature fed back by the temperature detection resistor. Since the temperature detection resistor is cheap and the method of determining the short circuit by the charger temperature is relatively simple, the cost of the charger is reduced.

[0061] As an optional real-time method, the control unit 101 is also used to send a third transformation signal to the transformation unit 103 when it is determined based on the operating data of the transformation unit 103 that the charger is not short-circuited; then the transformation unit 103 can transform the voltage provided by the power supply according to the third transformation signal sent by the control unit 101 to obtain a third voltage, and output the third voltage to the device to be charged, and the third voltage is greater than or equal to the minimum charging voltage of the device to be charged (for example: the rated charging voltage of the device to be charged, or the fast charging voltage of the device to be charged, etc., not limited here).

[0062] When implementing the above charger, the control unit can also increase the voltage output by the charger to a level greater than or equal to the minimum charging voltage of the device to be charged when determining that the charger is not short-circuited, so that the charger can charge the device to be charged normally.

[0063] Please read further Figure 2 As an optional implementation, the charger may further include a pulse signal generating unit 106, which is electrically connected to the control unit 101. The pulse signal generating unit 106 may be used to generate a pulse signal (for example, a pulse width modulation (PWM) signal, wherein pulse width modulation is an analog control method, which may modulate the bias of the transistor base or the MOS tube gate according to the change of the corresponding load to achieve the change of the transistor or MOS tube conduction time, thereby achieving a periodic change of the output signal, or a pulse code modulation (PCM) signal, which is not limited here) and send it to the control unit 101. The pulse signal is used to enable the control unit 101 to generate a voltage conversion signal (for example, the first voltage conversion signal, the second voltage conversion signal, etc.) according to the pulse signal.

[0064] By implementing the above charger, the pulse signal generating unit can electrically isolate the voltage transformation unit and the control unit, thereby reducing the interference of the control unit on the voltage transformation unit.

[0065] As an optional implementation, the charger may further include a humidity sensor, which may be electrically connected to the control unit 101, for collecting a target humidity value inside the charger and feeding the collected target humidity value back to the control unit 101; and the control unit 101 may further be used to determine whether the target humidity value is within a preset humidity range (the humidity range indicates that the interior of the charger is in a humid state, and its specific value may be set by the developer based on a large amount of development data, and is not limited here); and if the target humidity value is within the preset humidity range, the control unit 101 may control the transformer unit 103 to generate a first voltage lower than the minimum charging voltage of the device to be charged, and control the short-circuit detection module to collect the operating data of the transformer unit 103, so as to determine whether the charger is short-circuited based on the operating data.

[0066] In practice, it is found that a humid environment can easily cause a short circuit in the internal circuit or components of the charger. Therefore, the above-mentioned charger can be used to determine whether the inside of the charger is humid through data collected by the humidity sensor before the charged device is connected to the charger. Then, a short circuit detection can be performed when it is determined that the inside of the charger is humid to ensure the safety of the subsequent charging process.

[0067] Optionally, the charger may further include an adjustment button, which is communicatively connected to the control unit 101, and when the adjustment button is touched, the adjustment button can send a voltage adjustment signal to the control unit 101, and the control unit 101 can send a first voltage transformation signal to the transformation unit 103 according to the received voltage adjustment signal.

[0068] By implementing the above charger, the user can also manually control the charger to output a low voltage to form a charging protection period for the device to be charged, thereby improving the controllability of the charger.

[0069] For the corresponding Figure 5 , Figure 5 This is a schematic diagram of the internal circuit of a charger disclosed in an embodiment of the present application. The internal circuit of the charger may include: a control unit U1 (for example: a control chip, a single-chip microcomputer, used to implement functions such as logic control and logic operation), a MOS tube Q1 (for example: a P-channel MOS tube or an N-channel MOS tube, used to implement the switch of the output voltage of the transformer unit T1), a current detection resistor R1 (for detecting the current of the internal circuit), a temperature detection resistor R2 (for example: an NTC thermistor, a PTC thermistor, etc., for detecting the temperature of the internal circuit), a modulation unit U2 (for generating a pulse signal) and a transformer unit T1 (for example: a transformer circuit or a transformer, used to transform the power supply voltage input to the charger so that the output voltage of the charger can adapt to the device to be charged).

[0070] Optionally, the control unit U1 can be electrically connected to the adjustment unit U2 and the transformer unit T1 respectively, and the adjustment unit U2 and the transformer unit T1 are electrically connected; then the control unit U1 can send a first transformer signal to the transformer unit T1 according to the pulse signal generated by the adjustment unit U2, and then the transformer unit T1 can output a first voltage according to the first transformer signal; optionally, the control unit U1 can also be electrically connected to the identity identification pin ID in the charger interface, and then when the control unit U1 detects that the identity identification pin ID is short-circuited, it can be determined that there is a charged device connected to the charger; optionally, the control unit U1 can also be electrically connected to the current detection resistor R1 and / or the temperature detection resistor R2 ( Figure 5 It is only exemplarily shown that the control unit U1 is electrically connected to the current detection resistor R1 and the temperature detection resistor R2, respectively, and should not constitute a limitation on the embodiments of the present application). Then, the control unit U1 can determine whether the charger is short-circuited by the circuit current and circuit temperature fed back by the current detection resistor R1 and the temperature detection resistor R2. If the control unit U1 determines that the charger is not short-circuited, the control unit U1 can send a second voltage transformation signal to the transformer module T1 according to the pulse signal generated by the adjustment unit U2, so that the voltage output by the transformer module T1 is increased to be greater than or equal to the minimum charging voltage of the device to be charged, so as to charge the device to be charged; optionally, the control unit U1 can also be electrically connected to the MOS tube Q1, and then when the control unit U1 determines that the charger is short-circuited, the MOS tube Q1 can be controlled to be turned off, so that the transformer module T1 no longer charges the device to be charged.

[0071] It should be noted that: Figure 5 The GND in it is the ground pin in the charger interface, and the VBUS is the power pin in the charger interface; the connecting device may include a data line, a power line, or other wires including a positive pole and a negative pole, which are not limited here; the charged device may include an electronic device such as a mobile phone, a tablet computer, a learning machine, or a smart watch, which are not limited here.

[0072] With the internal circuit of the above-mentioned charger, since the control unit inside it can change the output voltage of the charger through the transformer unit, the control unit can control the transformer circuit to only generate a first voltage less than the minimum charging voltage of the device to be charged when the device to be charged is connected. At this time, the charger will not charge the device to be charged, thereby forming a charging protection period. During this protection period, the control unit can control the short-circuit detection unit to perform a short-circuit self-check on the charger, and when it is determined that the charger has a short circuit, control the switch unit to close to prohibit the charger from outputting voltage, thereby avoiding a short circuit in the charger during the charging process, which may cause damage to the device or even cause a fire, thereby improving the safety of the charging process of the electronic equipment.

[0073] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. Those skilled in the art should also be aware that the embodiments described in the specification are all optional embodiments, and the actions and modules involved are not necessarily required for the present application.

[0074] In the various embodiments of the present application, it should be understood that the size of the serial numbers of the above-mentioned processes does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0075] The units described above as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0076] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0077] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-accessible memory. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product, which is stored in a memory and includes several requests for a computer device (which can be a personal computer, a server or a network device, etc., specifically a processor in a computer device) to perform some or all of the steps of the above-mentioned methods of various embodiments of the present application.

[0078] Those skilled in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage medium includes a read-only memory (ROM), a random access memory (RAM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), a one-time programmable read-only memory (OTPROM), an electronically erasable rewritable read-only memory (EEPROM), a compact disc (CD-ROM) or other optical disc storage, magnetic disk storage, magnetic tape storage, or any other computer-readable medium that can be used to carry or store data.

[0079] A charger disclosed in an embodiment of the present application is introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A charger, characterized in that: The charger comprises a control unit, a short circuit detection unit, a transformer unit and a switch unit, wherein the control unit is electrically connected to the short circuit detection unit, the transformer unit and the switch unit respectively, and the transformer unit is also electrically connected to the short circuit detection unit and the switch unit respectively. The charger also comprises a device detection unit to be charged, which is electrically connected to the control unit. The device detection unit to be charged comprises a power pin and an identity pin in the female socket of the charger interface, wherein the identity pin is a part separated from the power pin, wherein: The control unit is configured to determine that a device to be charged is connected to the charger when detecting that the power pin and the identity pin are short-circuited, and send a first voltage transformation signal to the voltage transformation unit; The voltage transformation unit is also electrically connected to the power supply, and is used to transform the voltage provided by the power supply to obtain a first voltage according to the first voltage transformation signal sent by the control unit, and output the first voltage to the charging circuit of the device to be charged, wherein the first voltage is less than the minimum charging voltage of the device to be charged, and the short circuit detection unit is connected in series to the charging circuit; The control unit is further used to obtain operating data of the short-circuit detection unit under the action of the first voltage, and when it is determined that the charger is short-circuited according to the operating data, control the switch unit to disconnect so that the transformer unit no longer outputs voltage to the device to be charged.

2. The charger according to claim 1, characterized in that: The device to be charged detection unit includes a ground pin and an identity pin in the interface of the charger, and the control unit is further used to determine that there is a device to be charged connected to the charger when it is detected that the ground pin and the identity pin are short-circuited.

3. The charger according to any one of claims 1 to 2, characterized in that: The control unit is used to send a second voltage transformation signal to the voltage transformation unit before detecting that the device to be charged is connected; The voltage transformation unit is used to transform the voltage provided by the power supply to obtain a second voltage according to the second voltage transformation signal sent by the control unit, and the second voltage is less than the minimum charging voltage of the device to be charged.

4. The charger according to claim 1, characterized in that: The charger further includes an output port, the output port being electrically connected to the voltage transformation unit and the control unit respectively, and the output port being used to output a charging current to charge the device to be charged when the voltage generated by the voltage transformation unit is greater than or equal to the minimum charging voltage of the device to be charged; The control unit is further configured to determine that a device to be charged is connected to the charger when it is detected that the output port outputs the charging current.

5. The charger according to claim 1, characterized in that: The switch unit includes a MOS tube, a gate of the MOS tube is electrically connected to the control unit, a drain of the MOS tube and a source of the MOS tube are electrically connected to the transformer unit respectively, and the control unit is further used to send a first control voltage to the gate of the MOS tube to turn off the MOS tube when it is determined according to the operating data that the charger is short-circuited.

6. The charger according to claim 1, characterized in that: The short-circuit detection unit includes a current detection resistor, which is electrically connected to the control unit and the transformer unit respectively. The current detection resistor is used to collect the real-time current of the transformer unit, and the real-time current is used to enable the control unit to determine whether the charger is short-circuited based on the real-time current.

7. The charger according to claim 1, characterized in that: The short circuit detection unit includes a temperature detection resistor, which is electrically connected to the control unit and the transformer unit respectively. The temperature detection resistor is used to collect the real-time temperature of the transformer unit. The real-time temperature is used to enable the control unit to determine whether the charger is short-circuited according to the real-time temperature.

8. The charger according to claim 1, characterized in that: The control unit is further configured to send a third voltage transformation signal to the voltage transformation unit when it is determined according to the operation data that the charger is not short-circuited; The transformer unit is further used to transform the voltage provided by the power supply to obtain a third voltage according to the third transformation signal sent by the control unit, and output the third voltage to the device to be charged, wherein the third voltage is greater than or equal to the minimum charging voltage of the device to be charged.

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