Power supply, power supply control method and electronic equipment

Abstract

The invention provides a power supply, a power supply control method and electronic equipment, and relates to the technical field of power supply circuits. In the application, the auxiliary power supply circuit can generate at least one auxiliary voltage for enabling a plurality of IC modules included in the charging circuit based on a second direct current voltage obtained by processing through the input circuit and the transformer circuit in sequence; the charging circuit is used for enabling the plurality of IC modules based on at least one auxiliary voltage when it is detected that a load connected to a power supply needs to be charged; the power supply circuit is configured to generate a first supply voltage for controlling the input circuit and the converter circuit based on the first DC voltage, the second DC voltage, a first turn ratio of the auxiliary winding to the primary winding in the converter circuit, and a second turn ratio of the auxiliary winding to the secondary winding in the converter circuit. Therefore, the power consumption of the power supply and the circuit cost are reduced while the size of the power supply is further reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply circuit, and particularly relates to a power supply, a power supply control method and an electronic device. BACKGROUND

[0002] The power delivery (PD) protocol is a power supply standard based on the Universal Serial Bus (USB) Type-C interface. With the popularity of the USB Type-C, more and more devices (such as mobile phones, tablets, chargers, etc.) use the fast charging scheme of the USB-PD, and the power supply using the PD protocol is a PD power supply.

[0003] At present, the PD power supply usually provides an auxiliary voltage of a certain size (such as 3.3V and 5V) for each IC module (such as a digital signal processor (DSP) module, a micro-controller unit (MCU), and a half-bridge driving module, etc.) using an integrated circuit (IC) protocol included in the PD power supply through an independent auxiliary power supply, so as to ensure that each IC module can operate normally.

[0004] As can be seen, in the above PD power supply, since the auxiliary power supply has a certain volume, the volume is limited, so the volume of the PD power supply is still large. Moreover, the auxiliary power supply will always supply power to each IC module, which leads to a large power consumption of the PD power supply. In addition, in the above PD power supply, the auxiliary power supply also uses a transformer winding, which leads to a high circuit cost of the power supply. Therefore, how to further reduce the volume of the PD power supply while reducing the power consumption and circuit cost of the PD power supply is a problem to be solved at present. SUMMARY

[0005] The embodiments of the present application provide a power supply, a power supply control method and an electronic device, so as to further reduce the volume of the power supply while reducing the power consumption and circuit cost of the power supply.

[0006] In a first aspect, the embodiments of the present application provide a power supply, which comprises: an input circuit configured to process an alternating current input to generate a first direct current voltage; a converter circuit configured to perform step-down processing on the first direct current voltage to output a second direct current voltage; an auxiliary power supply circuit configured to generate at least one auxiliary voltage based on the second direct current voltage; a charging circuit configured to enable a plurality of IC modules included in the charging circuit based on the at least one auxiliary voltage when it is detected that a load connected to the power supply needs to be charged, and generate a charging voltage required by the load based on a third DC voltage generated by the transformer circuit when it is determined that the load needs to be charged; a power supply circuit having an input end connected to one end of an auxiliary winding in the transformer circuit, and configured to generate a first power supply voltage based on the first DC voltage, the second DC voltage, a first turns ratio of the auxiliary winding to a primary winding in the transformer circuit, and a second turns ratio of the auxiliary winding to a secondary winding in the transformer circuit; a control circuit configured to control the input circuit and the transformer circuit after the first power supply voltage is connected.

[0007] In a second aspect, the embodiments of the present application further provide a power supply control method applied to the power supply as described in the first aspect, and the method comprises: processing the AC input to generate a first DC voltage; performing voltage reduction on the first DC voltage to output a second DC voltage; generating at least one auxiliary voltage based on the second DC voltage; enabling a plurality of IC modules included in a charging circuit based on the at least one auxiliary voltage when it is detected that a load connected to the power supply needs to be charged, and generating a charging voltage required by the load based on a third DC voltage generated by the transformer circuit when it is determined that the load needs to be charged.

[0008] In a third aspect, the embodiments of the present application further provide an electronic device comprising the power supply as described in the first aspect.

[0009] The present application has the following advantages: In the power supply provided by the embodiments of the present application, the auxiliary power supply circuit can generate at least one auxiliary voltage for enabling a plurality of IC modules included in the charging circuit based on the second DC voltage obtained by sequentially processing via the input circuit and the transformer circuit, without the need for a separately arranged auxiliary power supply, thereby avoiding the problem that the volume of the power supply is still large due to the volume of the auxiliary power supply, and solving the problem that the auxiliary power supply always supplies power to the plurality of IC modules included in the power supply, thereby causing the power consumption of the power supply to be large. In addition, the power supply circuit uses the auxiliary winding in the transformer circuit, without the need for additional transformer windings, thereby reducing the number of transformer windings used, and thus reducing the circuit cost of the power supply.

[0010] In addition, other features and advantages of the present application will be set forth in the description that follows, and in part will become apparent to those skilled in the art upon examination of the following or can be learned by practice of the application. The objects and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application or the related art. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other related drawings can also be obtained from these drawings without creative effort. In the drawings: Figure 1 A related circuit structure schematic diagram of a PD power supply is provided for the embodiments of the present application.

[0012] Figure 2 A component structure schematic diagram of a power supply is provided for the embodiments of the present application.

[0013] Figure 3 A circuit structure schematic diagram of an AHB circuit is provided for the embodiments of the present application.

[0014] Figure 4 A schematic diagram of working waveform variation based on Figure 3 is provided for the embodiments of the present application.

[0015] Figure 5 Another component structure schematic diagram of a power supply is provided for the embodiments of the present application.

[0016] Figure 6 Still another component structure schematic diagram of a power supply is provided for the embodiments of the present application.

[0017] Figure 7 A circuit structure schematic diagram of a power supply based on Figure 6 is provided for the embodiments of the present application.

[0018] Figure 8 An implementation flowchart of a power supply control method is provided for the embodiments of the present application.

[0019] REFERENCE NUMERALS: 1-input circuit; 2-converter circuit; 3-accessory power supply circuit; 31-voltage reduction module; 32-voltage stabilization module; 4-charging circuit; 41-load access module; 42-second control module; 43-switching module; 44-charging module; 5-power supply circuit; 51-first voltage generation module; 52-second voltage generation module; 521-first switching unit; 522-second switching unit; 523-voltage generation unit; 6-control circuit; 61-voltage feedback module; 62-transmission module; 63-first control module; 7-boosting circuit. DETAILED DESCRIPTION

[0020] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described and it is therefore contemplated to cover all such modifications as fall within the scope of the application. It is to be understood that the application is not limited in its application to the details set forth in the description below.

[0021] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0022] In addition, the terms "first", "second", "third" and the like are used only for descriptive purposes and should not be construed as indicating or implying relative importance or a specific number of the technical features indicated. Therefore, the features defined with "first", "second" can include at least one of the features explicitly or implicitly. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0023] In this application, unless otherwise clearly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0024] First, the design idea of the embodiment of the present application is briefly introduced as follows: The current PD power supply usually sets an independent auxiliary power supply to provide auxiliary voltages of certain sizes (such as 3.3V and 5V) for each IC module included in the PD power supply, so as to ensure that each IC module can operate normally. Referring to Figure 1 The auxiliary power supply separately arranged in the PD power supply can generate 3.3V auxiliary voltage and 5V auxiliary voltage through a rectifier filter module and a low dropout regulator (LDO) to ensure that each IC module included in the PD power supply can operate normally. Among them, each IC module can include but is not limited to: half-bridge drive module, isolation drive module and isolation power module, DSP and MCU, etc.

[0025] Because the auxiliary power supply has a certain volume, there is a limit to the extreme volume, so the volume of the PD power supply is still large. And because the auxiliary power supply will always power each IC module, the power consumption of the PD power supply is large. In view of this, how to further reduce the volume of the power supply while reducing the power consumption of the power supply is a problem to be solved at present.

[0026] The power supply (such as PD power supply) provided by the embodiment of the present application, referring to Figure 2 The power supply includes: input circuit 1, converter circuit 2, auxiliary power supply circuit 3, charging circuit 4, power supply circuit 5 and control circuit 6.

[0027] The input circuit 1 is configured to receive an AC input and process the AC input to generate a first DC voltage. As an optional implementation, the input circuit 1 can be a power factor correction (PFC) circuit. The PFC circuit can improve the power factor (PF), reduce current harmonics and stabilize the output voltage. From the perspective of whether the inductor current in the PFC circuit is continuous, the current conduction mode of the PFC circuit includes: continuous conduction mode (CCM), critical-conduction mode (Cr-CM) and discontinuous conduction mode (DCM).

[0028] In the CCM, the inductor current in the PFC circuit always remains in the on state, i.e., the inductor current will not drop to zero in the entire switching period. In the DCM, the inductor current in the PFC circuit drops to zero in each switching period, i.e., the inductor current is intermittently interrupted. In the Cr-CM, the inductor current in the PFC circuit just drops to zero at the end of each switching period, but immediately recovers at the beginning of the next period.

[0029] For example, assuming that the input voltage corresponding to the input AC signal of the power supply is 90V, if the PFC circuit is closed, the first DC voltage can be 127V; if the PFC circuit is opened, the first DC voltage can be 350V. For another example, assuming that the input voltage corresponding to the input AC signal of the power supply is 230V, if the PFC circuit is closed, the first DC voltage can be 325V; if the PFC circuit is opened, the first DC voltage can be 380V.

[0030] It should be noted that in the embodiments of the present application, the PFC circuit can be an active PFC circuit (or called active PFC circuit) or a passive PFC circuit (or called passive PFC circuit). The active PFC circuit controls the on-off of the switch tube through a special control circuit to make the input current follow the change of the input voltage, thereby correcting the PF. The passive PFC circuit improves the PF by compensating for the reactive power.

[0031] The converter circuit 2 is configured to process the first DC voltage to output a second DC voltage. The second DC voltage is used to generate an auxiliary voltage for enabling a plurality of ICs included in the power supply.

[0032] In the embodiments of the present application, the converter circuit 2 can be an asymmetrical half-bridge (AHB) circuit. Referring toFigure 3 As shown, the AHB circuit can include: a primary side half-bridge high-side power tube (i.e. upper tube) S1, a primary side half-bridge low-side power tube (i.e. lower tube) S2, a first switching diode DS1, a second switching diode DS2, a first capacitor Coss1, a second capacitor Coss2, a primary side series resonant capacitor Cr, a transformer Tr with a turns ratio of N:1 between the primary winding and the secondary winding, an excitation inductance Lm of the primary winding of the transformer, a leakage inductance Lr of the primary winding of the transformer, and a secondary rectifier diode DR.

[0033] The working module of the AHB circuit in one switching cycle can refer to Figure 4 As shown, in the T0-T1 phase (i.e. mode 1), the upper tube S1 is turned on, the lower tube S2 is turned off, and the secondary rectifier diode DR is turned off. In this process, the excitation inductance Lm and the leakage inductance Lr start to increase from 0, the resonant capacitor Cr is charged, and no energy is transmitted to the output load of the secondary side.

[0034] In the T1-T2 phase (i.e. mode 2), the upper tube S1 is turned off, the lower tube S2 is turned off, and the secondary rectifier diode DR is turned off. In this phase, the first capacitor Coss1, the second capacitor Coss2, the excitation inductance Lm and the leakage inductance Lr resonate, the first capacitor Coss1 is charged, and the second capacitor Coss2 is discharged, until the charging of the first capacitor Coss1 is completed at the T2 moment, for example, the voltage of the first capacitor Coss1 is V IN , and the discharge of the second capacitor Coss2 is completed, for example, the voltage of the first capacitor Coss1 is 0.

[0035] In the T2-T3 phase (i.e. mode 3), the upper tube S1 is turned off, the lower tube S2 is turned on, and the secondary rectifier diode DR is turned off. At the T2 moment, the second switching diode DS2 is turned on, and at a certain moment after the T2 moment, the lower tube S2 is turned on. At this moment, since the second switching diode DS2 is turned on, the voltage difference VDS between the drain (i.e. D terminal) and the source (i.e. S terminal) of the lower tube S2 is 0, so the lower tube S2 is a zero voltage switching (ZVS). At the beginning of this phase, since the voltage V Cr of the primary side series resonant capacitor Cr will increase, the voltage V NS of the secondary winding of the transformer Tr will also increase, but it is still lower than the output voltage V0, so the secondary rectifier diode DR will not be turned on, i.e. it is still in the off state. At the T3 moment, the voltage V NS of the secondary winding increases to the output voltage V0, and the secondary rectifier diode DR is turned on.

[0036] At T3-T4 stage (i.e. mode 4), the upper tube S1 is off, the lower tube S2 is on, and the secondary rectifier diode DR is on. At T3 moment, the secondary rectifier diode DR is on, and the output voltage V0 is reflected to the primary winding of the transformer Tr, and the voltage V NP of the primary winding is -N x V0. At this time, the magnetizing inductance Lm and the leakage inductance Lr form a loop respectively, wherein the energy stored in the magnetizing inductance Lm is transmitted to the output load through the secondary winding, and the leakage inductance Lr, the resonant capacitor Cr and the voltage V NP of the primary winding are in series resonance, and the resonant capacitor Cr is discharged to the secondary output end, and the secondary current waveform is a sine wave, and the frequency thereof is determined by the parasitic inductance of the transformer Tr and the resonant capacitor Cr, and this part of energy is also transmitted to the output load through the secondary winding. Therefore, the current iDR of the secondary rectifier diode DR is determined according to the leakage inductance current iLr and the magnetizing inductance current iLm. For example, iDR = N (iLm - iLr). At this stage, the leakage inductance Lr and the resonant capacitor Cr are in series resonance, and after the leakage inductance current iLr passes 0, the reverse continues to resonate; then, after a period of time, the magnetizing inductance current iLm also passes 0, and the reverse magnetizing continues to increase. At T4 moment, the leakage inductance current iLr and the magnetizing inductance current iLm are equal: iLr = iLm, the current of the secondary winding decreases to 0, the secondary rectifier diode DR is off, the zero current switching (ZCS) is off, and the lower tube S2 is off.

[0037] Based on the working principle of the AHB circuit, it can be known that the second DC voltage is generated when the AHB circuit performs the upper tube action and the lower tube action. The upper tube action refers to that when the upper tube S1 is on, the current flows to the transformer Tr through the upper tube S1 to provide energy for the load; the lower tube action refers to that when the lower tube S2 is on, the current flows to the transformer Tr through the lower tube S2 to provide energy for the load. It should be noted that the upper tube action and the lower tube action of the AHB circuit are complementary, that is, the upper tube S1 is on and the lower tube S2 is off, and the upper tube S1 is off and the lower tube S2 is on. The complementary action enables the AHB circuit to provide energy for the load in different time periods, thereby realizing efficient energy conversion.

[0038] For example, if the PFC circuit is off, and the first DC voltage is 127V or 325V, the second DC voltage is 10V. For another example, if the PFC circuit is on, and the first DC voltage is 350V or 380V, the second DC voltage is 28V.

[0039] The auxiliary power supply circuit 3 is configured to generate at least one auxiliary voltage based on the second DC voltage. The at least one auxiliary power supply is configured to enable a plurality of IC modules included in the power supply and adopting an IC protocol, so as to ensure that the charging circuit 4 is capable of generating a charging voltage required by the load based on the third DC voltage generated by the transformer circuit when it is determined that the load needs to be charged.

[0040] The at least one auxiliary voltage can also be referred to as the operating voltage of the plurality of IC modules. For example, the at least one auxiliary voltage can specifically include a +3.3V auxiliary voltage and / or a +5V auxiliary voltage. The plurality of IC modules can include, but are not limited to, an isolated power supply module, an isolated drive module, a half-bridge drive module, a DSP, and the like. It should be noted that the number of different IC modules is not specifically limited in the embodiments of the present application. Optionally, the number of each IC module can be determined according to the multi-level output requirement of the charging circuit 4.

[0041] The charging circuit 4 is configured to enable a plurality of IC modules included in the charging circuit and adopting an IC protocol based on the at least one auxiliary voltage when it is detected that the load connected to the power supply needs to be charged, and generate a charging voltage required by the load based on the third DC voltage generated by the transformer circuit when it is determined that the load needs to be charged. In addition, the charging circuit 2 is also configured to not generate a charging voltage required by the load based on the third DC voltage when it is detected that the load is not connected to the power supply or the load connected to the power supply does not need to be charged.

[0042] The input end of the power supply circuit 5 is connected to one end of the auxiliary winding in the transformer circuit 2 (not shown in the figure), Figure 2 The control circuit 6 is connected to the first input end of the input circuit 1, the first input end of the transformer circuit 2, and the output end of the power supply circuit 5, respectively. The power supply circuit 5 is configured to generate a first power supply voltage based on the first DC voltage, the second DC voltage, the first turn ratio of the auxiliary winding to the primary winding in the transformer circuit 2, and the second turn ratio of the auxiliary winding to the secondary winding in the transformer circuit 2. For example, if the number of turns of the primary winding is represented as np , the number of turns of the secondary winding is represented as ns , and the number of turns of the auxiliary winding is represented as naux , the first turn ratio can be represented as: naux / np , and the second turn ratio can be represented as: naux / ns .

[0043] Optionally, the calculation formula of the first power supply voltage can be represented as follows:

[0044] wherein, represents the first power supply voltage, represents the first DC voltage, represents the second DC voltage. For example, assuming the primary winding number of turns np = 26 Ts, the secondary winding number of turns ns = 4 Ts, the auxiliary winding number of turns naux = 1 Ts. If the first DC voltage = 127 V and the second DC voltage = 10 V, then the first supply voltage = 7.38 V; if the first DC voltage = 325 V and the second DC voltage = 10 V, then the first supply voltage = 15 V; if the first DC voltage = 350 V and the second DC voltage = 28 V, then the first supply voltage = 20.4 V; if the first DC voltage = 127 V and the second DC voltage = 28 V, then the first supply voltage = 21.6 V.

[0045] Based on the above manner, compared with the auxiliary power supply design in the prior art, the windings in the transformer circuit 2 are optimized, one winding is saved, and the cost of the circuit design is reduced.

[0046] The control circuit 6 is used to access the first supply voltage and control the input circuit 1 and the transformer circuit 2. In other words, the first supply voltage is used to enable the control circuit 6, so that the control circuit 6 controls the working of the input circuit 1 and the transformer circuit 2.

[0047] In the above embodiment, at least one auxiliary voltage for enabling a plurality of IC modules adopting an IC protocol included in the charging circuit is generated by the auxiliary power supply circuit 3, without a separately arranged auxiliary power supply, thereby avoiding the problem that the volume of the power supply is still large due to the volume of the auxiliary power supply. The voltage generation control of the charging circuit 4 also solves the problem that the auxiliary power supply always supplies power to the plurality of IC modules included in the power supply, thereby causing the power consumption of the power supply to be large. In addition, the input end of the supply circuit 5 is connected to one end of the auxiliary winding in the transformer circuit 2. Therefore, compared with the power supply shown in Figure 1 the auxiliary winding of the transformer circuit 2 can generate the first supply voltage for driving and controlling the input circuit 1 and the transformer circuit 2 of the control circuit 6, thereby reducing the circuit cost of the power supply.

[0048] In an alternative implementation, refer to Figure 5As shown, the power supply circuit 5 can include a first voltage generating module 51 and a second voltage generating module 52. The first voltage generating module 51 is configured to generate a first sub-voltage based on a first DC voltage and a first turns ratio when the transformer circuit 2 is in the upper tube action state, and generate a second sub-voltage based on a second DC voltage and a second turns ratio when the transformer circuit 2 is in the lower tube action state. The second voltage generating module 52 is configured to store the first sub-voltage and the second sub-voltage, and generate a first power supply voltage based on the first sub-voltage and the second sub-voltage.

[0049] Optionally, the first sub-voltage and the second sub-voltage are calculated as follows:

[0050]

[0051] wherein, represents the first sub-voltage, represents the first DC voltage, naux / np represents the first turns ratio, represents the second sub-voltage, represents the second DC voltage, naux / ns represents the second turns ratio.

[0052] Still taking the input circuit 1 as an example, if the PFC circuit is closed, and if the first DC voltage = 127V, the second DC voltage = 10V, the first turns ratio naux / np = 1 / 26, and the second turns ratio naux / ns = 1 / 4, then the first sub-voltage = 4.88V and the second sub-voltage = 2.5V. For another example, if the first DC voltage = 325V, the second DC voltage = 10V, the first turns ratio naux / np = 1 / 26, and the second turns ratio naux / ns = 1 / 4, then the first sub-voltage = 12.5V and the second sub-voltage = 2.5V.

[0053] If the PFC circuit is opened, and if the first DC voltage = 350V, the second DC voltage = 28V, the first turns ratio naux / np = 1 / 26, and the second turns ratio naux / ns = 1 / 4, then the first sub-voltage = 13.4V and the second sub-voltage = 7V. For another example, if the first direct voltage = 380V, the second direct voltage = 28V, the first turns ratio naux / np = 1 / 26, and the second turns ratio naux / ns = 1 / 4, the first sub voltage = 14.6V, and the second sub voltage = 7V.

[0054] In an alternative implementation, as shown in Figure 6 , the second voltage generating module 52 can include a first switch unit 521, a second switch unit 522, and a voltage generating unit 523. One end (e.g., the negative pole or cathode) of the first switch unit 521 is connected to the output end of the first voltage generating module 51, the other end (e.g., the positive pole or anode) of the first switch unit 521 is connected to one end of the voltage generating unit 523, one end (e.g., the positive pole or anode) of the second switch unit 522 is connected to the output end of the first voltage generating module 51, and the other end (e.g., the negative pole or cathode) of the second switch unit 522 is connected to the other end of the voltage generating unit 523.

[0055] The first switch unit 521 is configured to be conductive when the first voltage generating module 51 generates the first sub voltage, and to be non-conductive when the first voltage generating module 51 generates the second sub voltage; the second switch unit 522 is configured to be non-conductive when the first voltage generating module 521 generates the first sub voltage, and to be conductive when the first voltage generating module 51 generates the second sub voltage; the first input end of the voltage generating unit 523 stores the first sub voltage accessed to the voltage generating unit 523 when the first switch unit 521 is conductive, the second input end of the voltage generating unit 523 stores the second sub voltage accessed to the voltage generating unit 523 when the second switch unit 522 is conductive, and the voltage generating unit 523 generates the first supply voltage based on the first sub voltage and the second sub voltage.

[0056] In an alternative implementation, as shown in Figure 5 , the control circuit 6 can include a voltage feedback module 61, a transmission module 62, and a first control module 63. The output end of the converter circuit 2 is connected to the input end of the voltage feedback module 61, the transmission module 62 is connected to the output end of the voltage feedback module 61 and the input end of the first control module 63 respectively, and the first output end and the second output end of the first control module 63 are connected to the first input end of the input circuit 1 and the second input end of the converter circuit 2 respectively. The first control module 63 can be a controller XDSP2221E, and the embodiments of the present application are not limited thereto.

[0057] The voltage feedback module 61 is configured to generate a first voltage signal indicative of the first supply voltage. The transmission module 62 is configured to convert the first voltage signal into an optical signal, and convert the optical signal into a second voltage signal at the end of signal transmission of the optical signal. The first control module 63 is configured to control the input circuit 1 and the converter circuit 2 based on the second voltage signal. Optionally, the transmission module 62 can be an optical coupler (referred to as an optical coupler for short), and the embodiments of the present application do not limit this.

[0058] The transmission module 62 not only realizes non-contact transmission of the first voltage signal, but also realizes electrical isolation, improves the stability of signal transmission, and ensures stable control of the first control module 63 on the input circuit 1 and the converter circuit 2.

[0059] In an optional implementation manner, as shown in Figure 6 , the power supply can further include a boost circuit 7. The input end and the output end of the boost circuit 7 are connected with the output end of the control circuit 6 and the output end of the power supply circuit 5, respectively.

[0060] The boost circuit 7 is configured to perform boost processing on the first supply voltage when the first supply voltage is less than a preset voltage threshold, and output a second supply voltage with a voltage greater than or equal to the preset voltage threshold. The control circuit 6 is configured to control the input circuit 1 and the converter circuit 2 after the second supply voltage is connected. In this way, the boost circuit 7 performs voltage boost on the first supply voltage to ensure that the control circuit 6 can normally operate according to the boosted first supply voltage (i.e., the second supply voltage), and then realize stable control of the control circuit 6 on the input circuit 1 and the converter circuit 2.

[0061] It should be understood that the above-mentioned preset voltage threshold is also the enable voltage of the control circuit 6. For example, it is assumed that the above-mentioned preset voltage threshold is 15V. If the first supply voltage = 7.38V, it can be determined that the first supply voltage < the preset voltage threshold . At this time, the boost circuit 7 can perform boost processing on the first supply voltage , so as to obtain the second supply voltage with a voltage greater than or equal to the preset voltage threshold , such as the second supply voltage = 15V.

[0062] In an optional implementation manner, as shown in Figure 5As shown, the auxiliary power supply circuit 3 can include a voltage reduction module 31 and a voltage stabilization module 32. The input end of the voltage reduction module 31 is connected with the output end of the converter circuit 2, and the output end of the voltage reduction module 31 is connected with the input end of the voltage stabilization module 32. Optionally, the voltage stabilization module 32 can be an LDO.

[0063] The voltage reduction module 31 is configured to reduce the second DC voltage to generate a first auxiliary voltage. The voltage stabilization module 32 is configured to stabilize the first auxiliary voltage to generate a second auxiliary voltage. The second auxiliary voltage is less than the first auxiliary voltage, and can be represented as: second auxiliary voltage <first auxiliary voltage For example, the first auxiliary voltage = +5V, and the second auxiliary voltage = +3.3V.

[0064] It should be understood that the specific design of the auxiliary power supply circuit 3 can be determined according to the number of enable voltages of the plurality of IC modules included in the charging circuit 4, that is, the number of auxiliary voltages generated by the auxiliary power supply circuit 3 is determined according to the number of enable voltages of the plurality of IC modules included in the charging circuit 4.

[0065] In an optional implementation manner, as shown in Figure 5 , the charging circuit 4 can further include a load access module 41, a second control module 42, a switch module 43 and a charging module 44. The second control module 42 is connected with the load access module 41, the switch module 43 and the charging module 44, respectively. The plurality of IC modules are arranged between the second controller 42 and the charging module 44.

[0066] For example, the load access module 41 can be a USB Type-C module, the second control module 42 can be an MCU, and the charging module 44 can be a multi-level circuit formed by a plurality of metal oxide semiconductors (MOS) or a plurality of gallium nitrides (GAN).

[0067] The load access module 41 is configured to access the load and generate a charging state information of the load. The charging state information can be used to indicate whether the load needs to be charged. The second control module 42 is configured to receive the charging state information and a third auxiliary voltage, and generate a first control information when the charging state information indicates that the load needs to be charged. The third auxiliary voltage is one of the at least one auxiliary voltage used to enable the second control module 42. For example, the third auxiliary voltage can be an auxiliary voltage with a voltage value of +3.3V. It can be understood that the second control module 42 is configured to receive the third auxiliary voltage, i.e., the enable terminal of the second control module 42 is connected to the output terminal of the corresponding auxiliary voltage of the auxiliary power supply circuit 3.

[0068] The switch module 43 is configured to receive the first control information, output the at least one auxiliary voltage to the plurality of IC modules, and enable the plurality of IC modules. That is, the switch module 43 is configured to enable the plurality of IC modules only when the load needs to be charged, i.e., the auxiliary power supply circuit 3 supplies power to the plurality of IC modules only when the load needs to be charged. The switch between the auxiliary voltage output terminal of the auxiliary power supply circuit 3 and the plurality of IC modules is turned on or closed, thereby reducing the power consumption of the power supply. The charging module 44 is configured to generate a charging voltage required by the load based on the control signal of the plurality of IC modules and the third DC voltage, so as to realize the charging operation for the load.

[0069] Optionally, the second control module 42 is further configured to generate a second control information when the charging state information indicates that the load does not need to be charged. The switch module 43 is configured to receive the second control information and stop outputting the at least one auxiliary voltage to the plurality of IC modules. That is, the switch module 43 is configured to stop supplying power to the plurality of IC modules when the load does not need to be charged, i.e., the auxiliary power supply circuit 3 does not supply power to the plurality of IC modules when the load does not need to be charged. The switch between the auxiliary voltage output terminal of the auxiliary power supply circuit 3 and the plurality of IC modules is turned off or opened.

[0070] In order to further improve the control accuracy of the input circuit 1 and the converter circuit 2, the second control module 42 is further configured to generate a pulse modulation voltage based on the charging state information. The control circuit 6 is configured to control the input circuit 1 and the converter circuit 2 after accessing the first supply voltage and the pulse modulation voltage.

[0071] Based on the composition structure of the power supply, referring to FIG. 1, Figure 7 which is a circuit structure schematic diagram of a power supply provided by an embodiment of the present application. The input circuit 1 includes a PFC circuit. The live line access end (i.e., the L end) and the zero line access end (i.e., the N end) of the PFC circuit are configured to receive an input alternating current signal of the power supply and perform PFC processing on the input alternating current signal, and output a first direct current voltage , i.e. Figure 7 the voltage at the HV.

[0072] The transformer circuit 2 comprises an AHB module (i.e. the input end of the transformer circuit 2), a transformer TL and a synchronous rectification filter module (i.e. the output end of the transformer circuit 2). The first output end of the PFC circuit is connected with the first input end of the AHB module and used for outputting a first direct current voltage , and the second output end of the PFC circuit is connected with the second input end of the AHB module and grounded. The transformer TL comprises a primary winding, a secondary winding and an auxiliary winding, the 4 end and the X end of the primary winding, the B end of the secondary winding and the 3 end of the auxiliary winding are the same name ends, the 1 end of the primary winding, the A end of the secondary winding and the 2 end of the auxiliary winding are the same name ends. The first output end of the synchronous rectification filter module is used for outputting a second direct current voltage , i.e. Figure 7 the voltage at V0 in the above formula, and the second output end of the synchronous rectification filter module is connected with the signal ground SGND.

[0073] The first input end of the step-down module 31 comprised in the auxiliary power supply circuit 3 is connected with the first output end of the synchronous rectification filter module comprised in the transformer circuit 2, and used for receiving the second direct current voltage , and the second input end of the step-down module 31 is used for connecting with the signal ground SGND. The voltage stabilizing module 32 comprised in the auxiliary power supply circuit 3 can be an LDO. The first output end of the step-down module 31 is connected with the first input end of the LDO, and used for outputting a first auxiliary voltage of +5V generated , and the second output end of the step-down module 31 is connected with the second input end of the LDO. The first output end of the LDO is used for outputting a second auxiliary voltage of +3.3V generated , and the second output end of the LDO is used for connecting with the signal ground SGND.

[0074] The load access module 41 comprised in the charging circuit 4 can be a USB Type-C module, the second control module 42 comprised in the charging circuit 4 can be an MCU, the charging module 44 comprised in the charging circuit 4 can be a MOS module formed by a plurality of MOSs connected in series, and the plurality of IC modules comprised in the charging circuit 4 can specifically comprise: 1 isolation power supply module, 1 isolation drive module, 2 half-bridge drive modules and 1 DSP. The number of ICs in each IC module can be determined according to the number of USB Type-C modules (i.e. the demand for multi-level output). For example, each isolation power supply module, isolation drive module, half-bridge drive module and DSP corresponding to one USB Type-C module comprises one IC.

[0075] The USB Type-C module connects to both the MOS module and the MCU module to connect to the load and generate charging status information indicating whether the load needs charging. The MCU module also connects to the DSP and the switch module 44 and receives a third auxiliary voltage, which can be the second auxiliary voltage. = +3.3V. The DSP is connected through a first branch consisting of one half-bridge driver module and a second branch consisting of one half-bridge driver module and one isolation driver module. The half-bridge driver module and the isolation driver module in the second branch are also connected to an isolation power supply module, and the enable terminal (EN terminal) of the isolation power supply module is connected to the DSP. The auxiliary voltage for the DSP and the auxiliary voltage for the isolation driver module in the second branch are both +3.3V, and the auxiliary voltage for the isolation power supply module in the second branch and the auxiliary voltage for the half-bridge driver module in the first branch are both +5V.

[0076] Furthermore, when the MCU module determines, based on the charging status information, that the inserted USB Type-C module requires charging, it can send first control information to the switch module 44 to enable conduction between the +3.3V auxiliary voltage input terminal and the +3.3Vcc auxiliary voltage output terminal, as well as between the +5V auxiliary voltage input terminal and the +5Vcc auxiliary voltage output terminal, within the switch module 44. When the MCU module determines, based on the charging status information, that there is no load when the USB Type-C module is inserted, or that the load with the inserted USB Type-C module does not require charging, it can send second control information to the switch module 44 to disable the +3.3V auxiliary voltage input terminal and the +3.3Vcc auxiliary voltage output terminal, as well as between the +5V auxiliary voltage input terminal and the +5Vcc auxiliary voltage output terminal.

[0077] The first voltage generation module 51 included in the power supply circuit 5 can be a storage unit, such as a first capacitor C1. Specifically, when the converter circuit 2 is in the upper transistor operating state, the first capacitor C1 generates voltage based on the first DC voltage. Ratio to the first number of turns naux / np Generate the first sub-voltage And when converter circuit 2 is in the lower transistor operation state, based on the second DC voltage Second turns ratio naux / ns Generate the second sub-voltage .

[0078] The first switch unit 521 included in the second voltage generating module 52 in the power supply circuit 5 can be a third switch diode DS3, the second switch unit 522 included in the second voltage generating module 52 can be a fourth switch diode DS4, and the voltage generating unit 523 included in the second voltage generating module 52 can also be an energy storage unit, such as a second capacitor C2. As shown in Figure 7 , one end of the first capacitor C1 is connected to the 2 terminal of the auxiliary winding, and the 3 terminal of the auxiliary winding is connected to the protection ground PGND. The other end of the first capacitor C1 is connected to the negative electrode (or cathode) of the third switch diode DS3 and the positive electrode (or anode) of the fourth switch diode DS4, respectively. The fourth switch diode DS4 is connected in parallel with the second capacitor C2 and the third switch diode DS3, the negative electrode of the second capacitor C2 is connected to the positive electrode (or anode) of the switch diode DS3, and the second capacitor C2 is connected to the protection ground PGND. Thus, when the first capacitor C1 generates a first sub-voltage , the third switch diode DS3 is turned on, the fourth switch diode DS4 is turned off, and the negative electrode of the second capacitor C2 stores the first sub-voltage ; when the first capacitor C1 generates a second sub-voltage , the third switch diode DS3 is turned off, the fourth switch diode DS4 is turned on, and the positive electrode of the second capacitor C2 stores the second sub-voltage , therefore, the second capacitor C2 can generate a first power supply voltage according to the first sub-voltage and the first sub-voltage , that is = +(- ).

[0079] The transmission module 62 included in the control circuit 6 can include an optocoupler, and the first control module 63 included in the control circuit 6 can include a controller XDSP2221E. The optocoupler is connected to the voltage feedback module 61 and the controller XDSP2221E in the control circuit 6, respectively, one end of the voltage feedback module 61 is connected to the first output end of the synchronous rectification filter module, for receiving the second direct current voltage , and the controller XDSP2221E is connected to the PFC circuit and the AHB module, respectively. Optionally, the pulse modulation end of the MCU module is connected to the pulse modulation end of the voltage feedback module 61, and the pulse modulation voltage corresponding to the pulse modulation end can be represented as: PWM_V0, for improving the accuracy and reliability of the controller XDSP2221E to the AHB module and the PFC circuit, to better adapt to the charging demand of the load.

[0080] The boost circuit 7 can generate a first power supply voltage If the first supply voltage does not satisfy the voltage required by the controller XDSP2221E for normal operation (i.e., a preset voltage threshold), the first supply voltage is boosted to obtain a second supply voltage satisfying the voltage required by the controller XDSP2221E for normal operation. .

[0081] In summary, in the power supply provided by the embodiments of the present application, the auxiliary power supply circuit can generate at least one auxiliary voltage for enabling the plurality of IC modules included in the charging circuit based on the second DC voltage obtained by sequentially processing the input circuit and the transformer circuit, without a separately arranged auxiliary power supply, thereby avoiding the problem that the volume of the power supply is still large due to the volume of the auxiliary power supply, and solving the problem that the auxiliary power supply always supplies power to the plurality of IC modules included in the power supply, thereby resulting in large power consumption of the power supply. In addition, the supply circuit uses the auxiliary winding in the transformer circuit, without additional transformer windings, thereby reducing the number of transformer windings used, and thus reducing the circuit cost of the power supply.

[0082] Based on the same technical concept, the embodiments of the present application also provide a power supply control method for further reducing the volume of the power supply while reducing the power consumption of the power supply. Referring to FIG. 8, which is an implementation flowchart of a power supply control method provided by the embodiments of the present application, the execution subject is the power supply described above, and the specific implementation flow of the method is as follows: Figure 8 S801: Process the AC input to generate a first DC voltage.

[0083] Optionally, in step S801, the PFC circuit can be used to perform PFC processing on the AC input, thereby improving the PF, reducing current harmonics, and stabilizing the output of the first DC voltage.

[0084] S802: Perform step-down processing on the first DC voltage to output a second DC voltage.

[0085] S803: Generate at least one auxiliary voltage based on the second DC voltage.

[0086] In an optional implementation, in step S803, after the power supply generates the second DC voltage, the power supply can perform step-down processing on the second DC voltage to generate a first auxiliary voltage, and perform voltage stabilization processing on the first auxiliary voltage to generate a second auxiliary voltage. The second auxiliary voltage is smaller than the first auxiliary voltage. For example, the voltage of the first auxiliary voltage is +5V, and the voltage of the second auxiliary voltage is +3.3V.

[0087] ​​S804: When detecting that the load connected to the power supply needs to be charged, enabling the plurality of IC modules included in the charging circuit based on the at least one auxiliary voltage and generating the charging voltage required by the load based on the third DC voltage generated by the transformer circuit when determining that the load needs to be charged.

[0088] The plurality of IC modules described above can include an isolated power supply module, an isolated drive module, a half-bridge drive module, a DSP, and the like.

[0089] In an optional implementation, when performing step S804, the power supply can obtain the charging state information of the load after generating the at least one auxiliary voltage described above in response to the load being connected or plugged into the power supply. When the charging state information indicates that the load needs to be charged, the at least one auxiliary voltage is output to the plurality of IC modules to enable the plurality of IC modules. The charging state information can be used to indicate whether the load needs to be charged.

[0090] Optionally, when the charging state information indicates that the load does not need to be charged, the output of the at least one auxiliary voltage to the plurality of IC modules is stopped. At this time, the plurality of IC modules no longer work, thereby achieving the minimum standby loss of the power supply as a whole.

[0091] Based on the power supply control method described in steps S801-S804, the at least one auxiliary voltage for enabling the plurality of IC modules included in the charging circuit is generated based on the second DC voltage obtained by sequentially processing via the input circuit and the transformer circuit by the auxiliary power supply circuit. Without a separately arranged auxiliary power supply, the problem that the volume of the power supply is still large due to the volume of the auxiliary power supply is avoided. In addition, since the auxiliary power supply does not need to be arranged again, the problem that the power consumption of the power supply is large due to the auxiliary power supply always supplying power to the plurality of IC modules included in the power supply is also solved.

[0092] The electronic device can be, but is not limited to, a body weight scale, a body fat scale, a nutrition scale, an infrared electronic thermometer, a pulse oximeter, a human body composition analyzer, a mobile power supply, a wireless charger, a fast charger, a vehicle-mounted charger, an adapter, a display, a USB docking station, a touch pen, a true wireless earphone, a car central control screen, a car, a smart wearable device, a mobile terminal, and a smart home device. The smart wearable device includes, but is not limited to, a smart watch, a smart bracelet, and a cervical vertebra massage instrument. The mobile terminal includes, but is not limited to, a smart phone, a notebook computer, a tablet computer, and a point of sales (POS) terminal. The smart home device includes, but is not limited to, a smart socket, a smart rice cooker, a smart sweeper, and a smart lamp. The electronic device can generate at least one auxiliary voltage for enabling a plurality of IC modules included in the charging circuit based on the second direct current voltage obtained by sequentially processing the input circuit and the transformer circuit through the auxiliary power supply circuit, without a separately arranged auxiliary power supply, thereby avoiding the problem that the volume of the power supply is still large due to the volume of the auxiliary power supply in the related art, and solving the problem that the auxiliary power supply in the related art always supplies power to the plurality of IC modules included in the power supply, thereby causing the power consumption of the power supply to be large. In addition, since the power supply circuit uses the auxiliary winding in the transformer circuit, the number of transformer windings is not additionally increased, thereby reducing the number of transformer windings used, and reducing the circuit cost of the power supply.

[0093] It should be understood that all the above disclosure is merely preferred embodiments of the present application, and of course cannot limit the scope of the present application, and any equivalent changes made according to the claims of the present application are still within the scope of the present application.

Claims

1. A power supply, characterized in that, include: The input circuit is used to process the AC input and generate the first DC voltage. A converter circuit is used to step down the first DC voltage and output a second DC voltage; An auxiliary power supply circuit is used to generate at least one auxiliary voltage based on a second DC voltage. A charging circuit is configured to enable multiple IC modules included in the charging circuit based on the at least one auxiliary voltage when it is detected that a load connected to the power supply needs to be charged, and to generate the charging voltage required by the load based on a third DC voltage generated by the converter circuit when it determines that the load needs to be charged. A power supply circuit, the input terminal of which is connected to one end of the auxiliary winding in the converter circuit, is used to generate a first power supply voltage based on the first DC voltage, the second DC voltage, the first turns ratio of the auxiliary winding to the primary winding in the converter circuit, and the second turns ratio of the auxiliary winding to the secondary winding in the converter circuit. A control circuit is used to control the input circuit and the converter circuit after the first power supply voltage is connected.

2. The power supply as described in claim 1, characterized in that, The power supply circuit includes: The first voltage generation module is used to generate a first sub-voltage based on the first DC voltage and the first turns ratio when the converter circuit is in the upper transistor operation state, and to generate a second sub-voltage based on the second DC voltage and the second turns ratio when the converter circuit is in the lower transistor operation state. The second voltage generation module is used to store the first sub-voltage and the second sub-voltage, and to generate the first supply voltage based on the first sub-voltage and the second sub-voltage.

3. The power supply as described in claim 2, characterized in that, The second voltage generation module includes: The first switching unit is configured to be turned on when the first voltage generating module generates the first sub-voltage, and to be turned off when the first voltage generating module generates the second sub-voltage; The second switching unit is used to turn off when the first voltage generating module generates the first sub-voltage, and to turn on when the first voltage generating module generates the second sub-voltage; A voltage generating unit has a first input terminal storing the first sub-voltage connected to the voltage generating unit when the first switching unit is turned on, and a second input terminal storing the second sub-voltage connected to the voltage generating unit when the second switching unit is turned on, and generates the first supply voltage based on the first sub-voltage and the second sub-voltage.

4. The power supply as described in claim 1, characterized in that, The control circuit includes: A voltage feedback module is used to generate a first voltage signal indicating the first supply voltage; The transmission module is used to convert the first voltage signal into an optical signal, and to convert the optical signal into a second voltage signal when the signal transmission of the optical signal ends; The first control module is used to control the input circuit and the converter circuit based on the second voltage signal.

5. The power supply as described in any one of claims 1-4, characterized in that, The power supply also includes: A boost circuit is used to boost the first supply voltage when the first supply voltage is less than a preset voltage threshold, and output a second supply voltage with a voltage magnitude greater than or equal to the preset voltage threshold. The control circuit is used to control the input circuit and the converter circuit after the second power supply voltage is connected.

6. The power supply according to any one of claims 1-4, characterized in that, The auxiliary power supply circuit includes: A step-down module is used to step down the second DC voltage to generate a first auxiliary voltage; A voltage regulator module is used to regulate the first auxiliary voltage to generate a second auxiliary voltage; the second auxiliary voltage is less than the first auxiliary voltage.

7. The power supply according to any one of claims 1-4, characterized in that, The charging circuit also includes: A load access module is used to access the load and generate charging status information of the load; the charging status information is used to indicate whether the load needs to be charged. The second control module is configured to receive the charging status information and the third auxiliary voltage, and generate first control information when the charging status information indicates that the load needs to be charged; wherein, the third auxiliary voltage is the auxiliary voltage among the at least one auxiliary voltage used to enable the second control module; A switching module is used to receive the first control information, output the at least one auxiliary voltage to the plurality of IC modules, and enable the plurality of IC modules; A charging module is used to generate the charging voltage required by the load based on the control signals of the plurality of IC modules and the third DC voltage.

8. The power supply as described in claim 7, characterized in that, The second control module is further configured to generate second control information when the charging status information indicates that the load does not need to be charged; A switching module is used to receive the second control information and stop outputting the at least one auxiliary voltage to the plurality of IC modules.

9. The power supply as described in claim 7, characterized in that, The second control module is further configured to generate a pulse modulation voltage based on the charging state information; A control circuit is used to control the input circuit and the converter circuit after the first power supply voltage and the pulse modulation voltage are connected.

10. A power supply control method, characterized in that, The power supply used in any one of claims 1-9 comprises: The AC input is processed to generate a first DC voltage; The first DC voltage is stepped down to output a second DC voltage; At least one auxiliary voltage is generated based on the second DC voltage; When a load connected to the power supply is detected to need charging, the charging circuit is enabled by the at least one auxiliary voltage, and the charging voltage required by the load is generated by the third DC voltage generated by the converter circuit when it determines that the load needs charging.

11. An electronic device, characterized in that, It includes a device body and a power supply disposed on the device body as described in any one of claims 1-9.

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