Adjustment compensation circuit and charger

Abstract

The utility model provides an adjustment compensation circuit and a charger, the adjustment compensation circuit is coupled with a transformer, the circuit is characterized in that an input pin of a control chip is coupled with a first end of a primary coil and is suitable for inputting a first power supply voltage, an output pin is coupled with a second end of the primary coil, and a feedback pin is respectively coupled with a gating unit and a feedback unit and is suitable for inputting a second power supply voltage; the voltage regulator is suitable for regulating the compensation voltage output to the second end of the primary coil according to the first feedback signal or the second feedback signal; the feedback unit is coupled with the first end of the compensation coil and is suitable for providing a first feedback signal based on the voltage of the first end of the compensation coil; the gating unit is coupled with the first end of the compensation coil and is suitable for being gated or turned off in response to the voltage change of the first end of the compensation coil, and when the gating unit is gated, a second feedback signal is provided based on a second power supply voltage; the second power supply voltage changes along with the voltage of the first end of the compensation coil. By adopting the technical scheme, the load change of the electronic equipment end can be adapted.

Description

Technical Field

[0001] This utility model relates to the field of charging technology, and in particular to an adjustment compensation circuit and a charger. Background Technology

[0002] In recent years, with the rapid development of technology, electronic devices have become indispensable tools in people's daily lives. During use, electronic devices typically require a power source, and chargers are one such tool. Chargers provide a stable power supply to electronic devices by transferring current into them, thus enabling them to be charged.

[0003] Currently, transformers are commonly used in chargers to convert voltage amplitude. However, in practical applications, when the load on the electronic device changes, it will have a reverse effect on the transformer, causing a change in the transformer's voltage drop, resulting in the transformer being unable to adapt to the load changes on the electronic device. Utility Model Content

[0004] In view of this, the present invention provides an adjustment compensation circuit and a charger that can adapt to load changes at the electronic device end.

[0005] This utility model provides an adjustment and compensation circuit, comprising: a transformer coupled to a transformer, the transformer comprising a primary coil, a secondary coil, and a compensation coil; the circuit comprising a control chip, a gating unit, and a feedback unit, wherein:

[0006] The input pin of the control chip is coupled to the first end of the primary coil and is adapted to input a first supply voltage. The output pin of the control chip is coupled to the second end of the primary coil. The feedback pin of the control chip is coupled to the gating unit and the feedback unit respectively, and is adapted to adjust the compensation voltage output to the second end of the primary coil according to the first feedback signal or the second feedback signal, thereby compensating for the voltage change at the first end of the compensation coil.

[0007] The feedback unit is coupled to a first end of the compensation coil and is adapted to provide the first feedback signal based on the voltage at the first end of the compensation coil.

[0008] The gating unit is coupled to the first end of the compensation coil and is adapted to be turned on or off in response to a voltage change at the first end of the compensation coil. When the gating unit is turned on, it provides the second feedback signal based on the second supply voltage. The second supply voltage changes with the voltage change at the first end of the compensation coil.

[0009] Optionally, the gating unit includes: a driving module and a gating module, wherein:

[0010] The driving module, coupled to the gating module, is adapted to provide a driving signal having a first amplitude and a second amplitude to the gating module according to the second power supply voltage, wherein the second amplitude is generated when the voltage at the first end of the compensation coil changes;

[0011] The gating module is coupled to the feedback pin and is in a gating state when the driving signal has the first amplitude, so as to provide the second feedback signal to the driving signal; and in a de-energized state when the driving signal has the second amplitude.

[0012] Optionally, the gating unit satisfies at least one or more of the following:

[0013] The driving module includes a parallel voltage regulator, which comprises a voltage divider branch consisting of a first voltage divider resistor and a second voltage divider resistor, and a Zener transistor with a preset amplitude. The first terminal of the first voltage divider resistor is coupled to the selection module and is adapted to input the second supply voltage. The second terminal of the first voltage divider resistor is coupled to the control terminal of the Zener transistor and the first terminal of the second voltage divider resistor, respectively. The first terminal of the Zener transistor is coupled to the second terminal of the second voltage divider resistor and grounded.

[0014] The gating module includes: a first gating resistor, a second gating resistor, a third gating resistor, a gating transistor, and a first diode. The control terminal of the gating transistor is coupled to a first terminal of the first gating resistor and a first terminal of the first diode, respectively. The first terminal of the gating transistor is coupled to a first terminal of the compensation coil. The second terminal of the gating transistor is connected to the feedback pin via the second gating resistor. The second terminal of the first gating resistor is coupled to a first terminal of the third gating resistor and the driving module, respectively. The second terminal of the third gating resistor is coupled to a second terminal of the first diode.

[0015] Optionally, the feedback unit includes: a first feedback resistor, a second feedback resistor, a third feedback resistor, and a feedback capacitor, wherein: a first end of the first feedback resistor is coupled to a first end of the compensation coil, and a second end of the first feedback resistor is coupled to the second feedback resistor, the third feedback resistor, the feedback capacitor, and the feedback pin, respectively; the second ends of the second feedback resistor, the third feedback resistor, and the feedback capacitor are all grounded.

[0016] Optionally, the control chip has four output pins, and all four output pins are coupled to the second end of the primary coil;

[0017] The control chip further includes a ground pin, which is coupled to the input pin through a grounding capacitor;

[0018] The detection pin is grounded through a first detection resistor and a second detection resistor.

[0019] Optionally, the adjustment compensation circuit further includes at least one or more of the following:

[0020] A voltage divider unit is coupled between the first supply voltage and the input pin of the control chip, and is adapted to divide the first supply voltage to obtain an enable voltage;

[0021] The discharge circuit unit is coupled to the first end of the feedback unit and the compensation coil, respectively, and is adapted to cooperate with the feedback unit to provide a discharge circuit for the junction capacitance voltage when the gating unit is in the off state.

[0022] Optionally, the voltage divider unit includes a third voltage divider resistor and a fourth voltage divider resistor, wherein the first end of the third voltage divider resistor is coupled to the first end of the primary coil, the second end of the third voltage divider resistor is coupled to the first end of the fourth voltage divider resistor, and the second end of the fourth voltage divider resistor is coupled to the input pin of the control chip.

[0023] The discharge circuit unit includes: a first circuit resistor, a second diode, a second circuit resistor, a third diode, a first circuit capacitor, a second circuit capacitor, and an energy storage capacitor. The first end of the first circuit resistor is coupled to the first end of the primary coil. The second end of the first circuit resistor is coupled to the first end of the second diode and the first end of the first circuit capacitor. The second end of the second diode is coupled to the second end of the second circuit resistor, the first end of the energy storage capacitor, and the first end of the third diode. The second end of the first circuit capacitor is coupled to the first end of the second circuit resistor. The second ends of the energy storage capacitor and the second ends of the second circuit capacitor are both connected to a first ground. The first end of the second circuit capacitor is coupled to the second end of the third diode and is connected to a driving voltage.

[0024] Optionally, the primary coil and the compensation coil are located on the same side, and the second end of the primary coil and the first end of the secondary coil are of the same name, and the first end of the secondary coil and the first end of the compensation coil are of the same name.

[0025] Optionally, the adjustment compensation circuit further includes: an output rectifier module coupled to the output node of the secondary coil, wherein the output rectifier module includes:

[0026] The circuit includes a rectifier and filter branch consisting of a first electrolytic capacitor and a second electrolytic capacitor, and a relay branch consisting of a relay resistor, a relay capacitor, and a relay. The first terminals of both the first and second electrolytic capacitors are coupled to the first terminal of the secondary coil and serve as the output node. The second terminals of both the first and second electrolytic capacitors are connected to a second ground and are coupled to the second terminal of the relay and the second terminal of the relay capacitor. The first terminal of the relay resistor and the relay is coupled to the second terminal of the secondary coil, and the second terminal of the relay resistor is coupled to the first terminal of the relay capacitor.

[0027] Accordingly, this utility model also provides a charger, comprising:

[0028] A transformer, comprising: a primary coil, a secondary coil, and a compensation coil;

[0029] As described in any of the foregoing examples, the adjustment and compensation circuit is coupled to the transformer.

[0030] Compared with the prior art, the technical solution of this utility model embodiment has the following advantages:

[0031] The adjustment and compensation circuit provided in this utility model embodiment is based on the transformer principle, causing a change in the voltage on the secondary coil. In response to this change, the compensation unit can change the feedback amplitude of the feedback pin, thereby generating a corresponding compensation voltage at the second terminal of the primary coil. Thus, while the supply voltage remains constant, it can change the voltage drop across the primary coil, thereby changing the transformer voltage and compensating for the change, adapting to load variations at the electronic device. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0033] Figure 1 This diagram shows a structural schematic of an adjustment compensation circuit according to one embodiment of the present invention;

[0034] Figure 2 A schematic diagram of the specific structure of an adjustment compensation circuit in one embodiment of the present invention is shown. Detailed Implementation

[0035] As described in the background section, when the load on the electronic device changes, it will have a reaction effect on the transformer, causing a change in the transformer's voltage drop, resulting in an inability to adapt to the load changes on the electronic device. This phenomenon is especially pronounced when the charging cable is too long.

[0036] To address the aforementioned technical problems, this utility model provides a charging adjustment compensation circuit based on the transformer's voltage transformation principle, causing a change in the voltage on the secondary coil. In response to this change, the compensation unit can alter the feedback amplitude of the feedback pin, thereby generating a corresponding compensation voltage at the second terminal of the primary coil. Thus, while maintaining a constant supply voltage, it can change the voltage drop across the primary coil, thereby altering the transformer voltage and compensating for the change, adapting to load variations in electronic devices.

[0037] To enable those skilled in the art to better understand and implement this disclosure, the following detailed description of the specific solutions, principles, advantages, and effects of this disclosure is provided with reference to the accompanying drawings and specific embodiments.

[0038] See Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of an adjustment compensation circuit in one embodiment of the present invention. Figure 2 This is a schematic diagram of the specific structure of an adjustment compensation circuit in one embodiment of the present invention.

[0039] like Figure 1 and Figure 2 As shown, the adjustment compensation circuit 100 is coupled to the transformer T, which may include a primary coil Wp, a secondary coil Ws, and a compensation coil Wc.

[0040] More specifically, a change in the voltage across any one of the primary coil Wp, the secondary coil Ws, and the compensation coil Wc will cause a change in the voltage across the other coils. This voltage change will act on the adjustment compensation circuit 100, thereby allowing the adjustment compensation circuit 100 to compensate in response to this change.

[0041] In some embodiments, the primary coil Wp and the compensation coil Wc are located on the same side, and the second end 3 of the primary coil Wp and the first end 5 of the secondary coil Ws are the same end, and the first end 5 of the secondary coil Ws and the first end 4 of the compensation coil Wc are the same end.

[0042] In some embodiments, the number of turns of the primary coil Wp is greater than the number of turns of the secondary coil Ws.

[0043] Accordingly, the adjustment compensation circuit 100 may include: a control chip 110, a gating unit 130, and a feedback unit 120, wherein:

[0044] The input pin VDD of the control chip 110 is coupled to the first end 2 of the primary coil Wp and is adapted to input a first supply voltage V1. The output pin Drain of the control chip 110 is coupled to the second end 3 of the primary coil Wp. The feedback pin FB of the control chip 110 is coupled to the gating unit 130 and the feedback unit 120 respectively, and is adapted to adjust the compensation voltage output to the second end 3 of the primary coil Wp according to the first feedback signal (from the feedback unit 120) or the second feedback signal (from the gating unit 130), thereby compensating for the voltage change at the first end 4 of the compensation coil Wc.

[0045] In some embodiments, the first supply voltage V1 can be 310V DC.

[0046] The feedback unit 120 is coupled to the first end 4 of the compensation coil Wc and is adapted to provide the first feedback signal based on the voltage of the first end 4 of the compensation coil Wc.

[0047] It should be noted that, for ease of understanding, the actual coupling position between the feedback unit 120 and the first end 4 of the compensation coil Wc is referred to as the feedback node VR.

[0048] The gating unit 130 is coupled to the first terminal 4 (i.e., feedback node VR) of the compensation coil Wc and is adapted to be turned on or off in response to the voltage change of the first terminal 4 of the compensation coil. When the gating unit 130 is turned on, it provides a second feedback signal based on the second supply voltage VDD. The second supply voltage VDD1 changes with the voltage change of the first terminal 4 of the compensation coil Wc.

[0049] Specifically, when the voltage at the first terminal 4 of the compensation coil Wc increases, the second supply voltage VDD1 also increases.

[0050] Combination Figure 1 Briefly explain the working principle of the adjustment compensation circuit in this scheme:

[0051] Initially, upon receiving the first supply voltage V1, the control chip 110 operates and provides a compensation voltage with a first amplitude to the second terminal of the primary coil Wp. Consequently, a voltage with the upper positive terminal (V1) and the lower negative terminal (V3) of the primary coil Wp is formed, at which point the gating unit 130 is in the selected state. The gating unit 130 is connected to the feedback pin FB of the control chip 110, and the control chip 110 automatically adjusts the output compensation voltage according to the power level, achieving a constant voltage function.

[0052] At this time, the transformer voltage remains unchanged. Based on the transformer principle of transformer T1, the voltage of the primary coil Wp can be converted into the transformer voltage on the secondary coil Ws according to the transformation ratio, and then output through the output node A, for example, to an electronic device to charge the electronic device.

[0053] When the load condition at the electronic device changes, the voltage at the output node A changes. Since the output node A is the first terminal 5 of the secondary coil Ws, the voltage at the feedback node VR increases based on the transformation ratio of the transformer T1, which means that the voltage drop at the first terminal 4 of the compensation coil Wc changes.

[0054] For example, when the voltage at output node A increases, the voltage at feedback node VR increases via transformer T1, thereby disconnecting the path between the selection unit 130 and the feedback pin FB of the control chip 110. At this time, the feedback pin FB of the control chip 110 receives a second feedback signal from the feedback unit 120, causing a change in the voltage drop across the primary coil Wp.

[0055] By changing the transformation ratio, the transformation voltage is made to follow the load changes of the electronic equipment, thereby achieving consistency of the terminal voltage of the electronic equipment under light and heavy loads.

[0056] In this embodiment, see Figure 2 The control chip 110 has four output pins Drain, and all four output pins Drain are coupled to the second terminal 3 of the primary coil Wp.

[0057] The compensation voltage can be output to the second terminal 3 of the primary coil Wp through the output pin Drain, thereby changing the voltage drop between the first terminal 2 and the second terminal 3 of the primary coil Wp.

[0058] The control chip 110 may further include a ground pin GND, which is coupled to the input pin VDD through a grounding capacitor C8.

[0059] The detection pin CS is grounded through a first detection resistor R10 and a second detection resistor R14.

[0060] In this embodiment, the feedback unit 120 may include: a first feedback resistor R11, a second feedback resistor R12, a third feedback resistor R13, and a feedback capacitor C7, wherein: the first end of the first feedback resistor R11 is coupled to the first end 4 of the compensation coil Wc, and the second end of the first feedback resistor R11 is coupled to the second feedback resistor R12, the third feedback resistor R13, the feedback capacitor C7, and the feedback pin FB, respectively; the second ends of the second feedback resistor R12, the third feedback resistor R13, and the feedback capacitor C7 are all grounded.

[0061] Specifically, the first feedback resistor R11, the second feedback resistor R12, and the third feedback resistor R13 can divide the voltage on the feedback node VR, so that the voltage drop across the second feedback resistor R12 and the third feedback resistor R13 can be used as a feedback signal output to the feedback pin FB of the control chip 110.

[0062] In this embodiment, the gating unit may include: a driving module and a gating module, wherein:

[0063] The driving module, coupled to the gating module, is adapted to provide a driving signal having a first amplitude and a second amplitude to the gating module according to the second power supply voltage, wherein the second amplitude is generated when the voltage at the first end of the compensation coil changes;

[0064] The gating module is coupled to the feedback pin and is in a gating state when the driving signal has the first amplitude, so as to provide the second feedback signal to the driving signal; and in a de-energized state when the driving signal has the second amplitude.

[0065] Specifically, in the initial state, the second supply voltage is relatively low, at which point the drive module generates a drive signal with a first amplitude. Under the action of this drive signal, the gating module is activated, thereby enabling the second feedback signal to be output to the feedback pin.

[0066] When the voltage at the first terminal 4 of the compensation coil Wc changes, the second supply voltage VDD1 also changes accordingly. At this time, the drive module generates a drive signal with a second amplitude. Under the action of this drive signal, the gating module is disconnected, so that the feedback unit 120 can output the first feedback signal to the feedback pin FB.

[0067] This achieves compensation by using different feedback signals on the feedback pin FB.

[0068] In this embodiment, the gating unit 130 can satisfy at least one or more of the following:

[0069] The driving module may include a parallel voltage regulator (not shown in the figure), which includes a voltage divider branch composed of a first voltage divider resistor R63 and a second voltage divider resistor R65, and a Zener transistor U1 with a preset amplitude. The first end of the first voltage divider resistor R63 is coupled to the selection module and is adapted to input the second supply voltage VDD1. The second end of the first voltage divider resistor R63 is coupled to the control terminal of the Zener transistor U1 and the first end of the second voltage divider resistor R65, respectively. The first end of the Zener transistor U1 is coupled to the second end of the second voltage divider resistor R65 and grounded.

[0070] The gating module may include: a first gating resistor R66, a second gating resistor R60, a third gating resistor R62, a gating transistor Q5, and a first diode D5. The control terminal of the gating transistor Q5 is coupled to the first terminal of the first gating resistor R66 and the first terminal of the first diode D5, respectively. The first terminal of the gating transistor Q5 is coupled to the first terminal 4 of the compensation coil Wc. The second terminal of the gating transistor Q5 is connected to the feedback pin FB through the second gating resistor R60. The second terminal of the first gating resistor R66 is coupled to the first terminal of the third gating resistor R62 and the driving module, respectively. The second terminal of the third gating resistor R62 is coupled to the second terminal of the first diode D5.

[0071] Specifically, in the initial stage, VDD1 is relatively small. At this time, the voltage divided by the first voltage divider resistor R63 and the second voltage divider resistor R65 is relatively low. At this time, the Zener transistor U1 is in the off state. Based on VDD1 and VR, the selection transistor Q5 is selected.

[0072] When the voltage on the feedback node VR increases, VDD1 increases, which in turn increases the voltage across the first voltage divider resistor R63 and the second voltage divider resistor R65. As a result, the Zener transistor U1 is turned on and the selector transistor Q5 is turned off, thereby changing the feedback on the feedback pin FB of the control chip 110.

[0073] In practical applications, as mentioned earlier, the generated DC voltage is 310V. However, the operating voltage of the control chip is generally lower.

[0074] Based on this, see next. Figure 2 The adjustment and compensation circuit may further include: a voltage divider unit 150, coupled between the first power supply voltage V1 and the input pin VDD of the control chip 110, adapted to divide the first power supply voltage V1 to obtain the enable voltage VCC.

[0075] In some embodiments, see Figure 2 The voltage divider unit 150 may include a third voltage divider resistor R1 and a fourth voltage divider resistor R2, wherein the first end of the third voltage divider resistor R1 is coupled to the first end 2 of the primary coil Wp, and is adapted to input a first supply voltage V1; the second end of the third voltage divider resistor R1 is coupled to the first end of the fourth voltage divider resistor R2; and the second end of the fourth voltage divider resistor R2 is coupled to the input pin VDD of the control chip 110.

[0076] By setting the third voltage divider resistor R1 and the fourth voltage divider resistor R2, a suitable power supply voltage can be provided to the control chip 110, ensuring the safe and stable operation of the control chip 110.

[0077] As can be seen from the foregoing, this scheme achieves the change of feedback signal by selecting the on / off state of transistor Q5.

[0078] In practical work, the inventors discovered that at the moment when the selector transistor Q5 is turned off, the selector transistor Q5 is equivalent to a capacitor, causing the output pin Drain of the control chip 110 to discharge. The discharged spike voltage will damage the circuit and reduce performance.

[0079] Based on this, see next. Figure 2 The adjustment compensation circuit may further include: an absorption unit 160, coupled to the output terminal Drain of the control chip 110, adapted to absorb the spike voltage of the output pin Drain when the gating unit 130 is in the off state.

[0080] In one embodiment, see Figure 2 The absorption unit 160 may include: a first absorption resistor R5, a second absorption resistor R3, a third absorption resistor R4, a fourth diode D1, and an absorption capacitor C3. The first terminal of the first absorption resistor R5 is coupled to the output terminal Drain of the control chip 110, and the second terminal of the first absorption resistor R5 is coupled to the first terminal of the fourth diode D1. The second terminal of the fourth diode D1 is coupled to the second terminals of the second absorption resistor R3, the third absorption resistor R4, and the absorption capacitor C3, respectively. The first terminals of the second absorption resistor R3, the third absorption resistor R4, and the absorption capacitor C3 are also coupled.

[0081] In other words, the absorption unit 160 is an RCD absorption circuit. Furthermore, by employing a fourth diode D1, the flow direction of the peak voltage is ensured to be solely from the first absorption resistor R5 to the second absorption resistor R4, which significantly improves the operational stability of the adjustment and compensation circuit.

[0082] Furthermore, at the instant the turn-off transistor Q5 is turned off, the junction capacitance of the turn-off transistor Q5 will also discharge, thus requiring a corresponding discharge circuit.

[0083] Based on this, see next. Figure 2 The adjustment compensation circuit may further include: a discharge circuit unit 170, which is coupled to the feedback unit 120 and the first end 4 of the compensation coil, respectively, and is adapted to cooperate with the feedback unit 120 to provide a discharge circuit for the junction capacitance voltage when the selection unit 130 is in the off state.

[0084] In some embodiments, the discharge circuit unit 170 may include: a first circuit resistor R7, a second diode D2, a second circuit resistor R8, a third diode D4, a first circuit capacitor C6, a second circuit capacitor C4, and an energy storage capacitor C5. The first end of the first circuit resistor R7 is coupled to the first end 4 of the primary coil. The second end of the first circuit resistor R7 is coupled to the first end of the second diode D2 and the first end of the first circuit capacitor C6, respectively. The second end of the second diode D2 is coupled to the second end of the second circuit resistor R8, the first end of the energy storage capacitor C5, and the first end of the third diode D4, respectively. The second end of the first circuit capacitor C6 is coupled to the first end of the second circuit resistor R8. The second ends of the energy storage capacitor C6 and the second ends of the second circuit capacitor C4 are both connected to a first ground G1. The first end of the second circuit capacitor C4 is coupled to the second end of the third diode D4 and connected to the enable voltage VCC.

[0085] Furthermore, by forming a loop along the second diode D2 to the third diode D4, the voltage drop across the first terminal 4 and the second terminal 1 of the compensation coil Wc is made to be positive at the bottom and negative at the top. The corresponding terminal of the secondary coil Ws is opposite to that of the corresponding terminal of the primary coil Wp, so as to provide a stable constant current DC current to the subsequent circuit.

[0086] In some embodiments, to improve the voltage quality at output node A, see then... Figure 1 and Figure 2 The adjustment and compensation circuit also includes an output rectifier module coupled to the output node A of the secondary coil Ws.

[0087] The output rectifier module may include a rectifier-filter branch 142 composed of a first electrolytic capacitor C9 and a second electrolytic capacitor C10, and a relay branch 144 composed of a relay resistor R15, a relay capacitor C11, and a relay KA. The first terminals of both the first electrolytic capacitor C9 and the second electrolytic capacitor C10 are coupled to the first terminal 5 of the secondary coil Ws and serve as the output node A. The second terminals of both the first electrolytic capacitor C9 and the second electrolytic capacitor C10 are connected to a second ground G2 and are coupled to the second terminal of the relay KA and the second terminal of the relay capacitor C11. The first terminal of the relay resistor R15 and the relay KA are coupled to the second terminal 6 of the secondary coil Ws, and the second terminal of the relay resistor R15 is coupled to the first terminal of the relay capacitor C11.

[0088] Specifically, the first electrolytic capacitor C9 and the second electrolytic capacitor C10 connected to the secondary coil Ws can rectify and filter the transformer voltage, thereby improving the quality of the transformer voltage.

[0089] It should be noted that, in this embodiment, a mica capacitor is provided between the first ground G1 and the second ground G2.

[0090] It is understood that the above description provides multiple embodiment solutions, and the optional methods described in each embodiment solution can be combined with each other and cross-referenced without conflict, thereby extending to a variety of possible embodiment solutions, all of which can be considered as the embodiment solutions disclosed in this disclosure.

[0091] This disclosure also provides a charger, including: a transformer, the transformer including: a primary coil, a secondary coil, and a compensation coil; and an adjustment compensation circuit as described in any of the foregoing examples, the adjustment compensation circuit being coupled to the transformer.

[0092] For details regarding the structure and working principle of the compensation circuit, please refer to the aforementioned example.

[0093] While the embodiments disclosed herein are as described above, this utility model is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of this utility model; therefore, the scope of protection of this utility model should be determined by the scope defined in the claims.

Claims

1. An adjustment compensation circuit, characterized in that, Coupled to a transformer, the transformer includes: a primary coil, a secondary coil, and a compensation coil; the circuit includes: a control chip, a gating unit, and a feedback unit, wherein: The input pin of the control chip is coupled to the first end of the primary coil and is adapted to input a first supply voltage. The output pin of the control chip is coupled to the second end of the primary coil. The feedback pin of the control chip is coupled to the gating unit and the feedback unit respectively, and is adapted to adjust the compensation voltage output to the second end of the primary coil according to the first feedback signal or the second feedback signal, thereby compensating for the voltage change at the first end of the compensation coil. The feedback unit is coupled to a first end of the compensation coil and is adapted to provide the first feedback signal based on the voltage at the first end of the compensation coil. The gating unit is coupled to the first end of the compensation coil and is adapted to be turned on or off in response to a voltage change at the first end of the compensation coil. When the gating unit is turned on, it provides the second feedback signal based on the second supply voltage. The second supply voltage changes with the voltage change at the first end of the compensation coil.

2. The adjustment and compensation circuit according to claim 1, characterized in that, The gating unit includes: a driving module and a gating module, wherein: The driving module, coupled to the gating module, is adapted to provide a driving signal having a first amplitude and a second amplitude to the gating module according to the second power supply voltage, wherein the second amplitude is generated when the voltage at the first end of the compensation coil changes; The gating module is coupled to the feedback pin and is in a gating state when the driving signal has the first amplitude, so as to provide the second feedback signal to the driving signal; and in a de-energized state when the driving signal has the second amplitude.

3. The adjustment and compensation circuit according to claim 2, characterized in that, The gating unit satisfies at least one or more of the following: The driving module includes a parallel voltage regulator, which comprises a voltage divider branch consisting of a first voltage divider resistor and a second voltage divider resistor, and a Zener transistor with a preset amplitude. The first terminal of the first voltage divider resistor is coupled to the selection module and is adapted to input the second supply voltage. The second terminal of the first voltage divider resistor is coupled to the control terminal of the Zener transistor and the first terminal of the second voltage divider resistor, respectively. The first terminal of the Zener transistor is coupled to the second terminal of the second voltage divider resistor and grounded. The gating module includes: a first gating resistor, a second gating resistor, a third gating resistor, a gating transistor, and a first diode. The control terminal of the gating transistor is coupled to a first terminal of the first gating resistor and a first terminal of the first diode, respectively. The first terminal of the gating transistor is coupled to a first terminal of the compensation coil. The second terminal of the gating transistor is connected to the feedback pin via the second gating resistor. The second terminal of the first gating resistor is coupled to a first terminal of the third gating resistor and the driving module, respectively. The second terminal of the third gating resistor is coupled to a second terminal of the first diode.

4. The adjustment and compensation circuit according to claim 1, characterized in that, The feedback unit includes a first feedback resistor, a second feedback resistor, a third feedback resistor, and a feedback capacitor, wherein: the first end of the first feedback resistor is coupled to the first end of the compensation coil, and the second end of the first feedback resistor is coupled to the second feedback resistor, the third feedback resistor, the feedback capacitor, and the feedback pin, respectively; the second ends of the second feedback resistor, the third feedback resistor, and the feedback capacitor are all grounded.

5. The adjustment and compensation circuit according to claim 1, characterized in that, The control chip has four output pins, and all four output pins are coupled to the second end of the primary coil. The control chip further includes a ground pin, which is coupled to the input pin through a grounding capacitor; The detection pin is grounded through a first detection resistor and a second detection resistor.

6. The adjustment compensation circuit according to claim 1, characterized in that, The adjustment compensation circuit also includes at least one or more of the following: A voltage divider unit is coupled between the first supply voltage and the input pin of the control chip, and is adapted to divide the first supply voltage to obtain an enable voltage; The discharge circuit unit is coupled to the first end of the feedback unit and the compensation coil, respectively, and is adapted to cooperate with the feedback unit to provide a discharge circuit for the junction capacitance voltage when the gating unit is in the off state.

7. The adjustment compensation circuit according to claim 6, characterized in that, The voltage divider unit includes a third voltage divider resistor and a fourth voltage divider resistor, wherein the first end of the third voltage divider resistor is coupled to the first end of the primary coil, and the second end of the third voltage divider resistor is coupled to the first end of the fourth voltage divider resistor; the second end of the fourth voltage divider resistor is coupled to the input pin of the control chip. The discharge circuit unit includes: a first circuit resistor, a second diode, a second circuit resistor, a third diode, a first circuit capacitor, a second circuit capacitor, and an energy storage capacitor. The first end of the first circuit resistor is coupled to the first end of the primary coil. The second end of the first circuit resistor is coupled to the first end of the second diode and the first end of the first circuit capacitor. The second end of the second diode is coupled to the second end of the second circuit resistor, the first end of the energy storage capacitor, and the first end of the third diode. The second end of the first circuit capacitor is coupled to the first end of the second circuit resistor. The second ends of the energy storage capacitor and the second ends of the second circuit capacitor are both connected to a first ground. The first end of the second circuit capacitor is coupled to the second end of the third diode and is connected to a driving voltage.

8. The adjustment and compensation circuit according to claim 1, characterized in that, The primary coil and the compensation coil are located on the same side, and the second end of the primary coil and the first end of the secondary coil are the same name ends, and the first end of the secondary coil and the first end of the compensation coil are the same name ends.

9. The adjustment and compensation circuit according to claim 1, characterized in that, Also includes: An output rectifier module coupled to the output node of the secondary coil, wherein the output rectifier module includes: The circuit includes a rectifier and filter branch consisting of a first electrolytic capacitor and a second electrolytic capacitor, and a relay branch consisting of a relay resistor, a relay capacitor, and a relay. The first terminals of both the first and second electrolytic capacitors are coupled to the first terminal of the secondary coil and serve as the output node. The second terminals of both the first and second electrolytic capacitors are connected to a second ground and are coupled to the second terminal of the relay and the second terminal of the relay capacitor. The first terminal of the relay resistor and the relay is coupled to the second terminal of the secondary coil, and the second terminal of the relay resistor is coupled to the first terminal of the relay capacitor.

10. A charger, characterized in that, include: A transformer, comprising: a primary coil, a secondary coil, and a compensation coil; The adjustment and compensation circuit as described in any one of claims 1 to 9, wherein the adjustment and compensation circuit is coupled to the transformer.

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