Circuit control method and electronic equipment

Abstract

The invention provides a circuit control method and electronic equipment. The circuit comprises a self-excitation soft start unit, a synchronous rectification module, an isolation unit and a fast charging circuit unit. The self-excitation soft start unit comprises a pulse width modulation control module and a self-excitation soft start module; the isolation unit comprises a receiving module and a transmitting module; the quick charging circuit unit comprises an insertion detection module and other high-frequency modules; the method comprises the following steps: when the secondary novel fast charging circuit unit detects a starting instruction of a low power consumption mode, the secondary novel fast charging circuit unit cuts off all the power of modules except a power supply inserted into a detection module, for example, the power supplies of a synchronous rectification module and a transmitting module of an isolation unit are cut off; and the self-excitation soft start unit turns off the power supplies of the other receiving modules and other high-frequency modules except for receiving and detection of the isolation unit and switches to the low-frequency modules to work. And the circuit does not need to maintain very accurate secondary voltage output, so that the standby power consumption is further reduced.

Description

Technical Field

[0001] The present invention relates to the field of circuit technology, and in particular to a circuit control method and electronic equipment. Background Art

[0002] At present, the adapter requires that the standby power consumption must be lower than a certain standard before it can be sold on the market; the losses caused by the entire path of the adapter roughly include: 1. conduction loss, 2. switching loss, 3. control circuit loss.

[0003] Among them, because there is no large load change and no frequent switching in the standby state, the conduction loss can be ignored. The way for adapters on the market to achieve zero power consumption or low power consumption in standby is to reduce switching losses and control circuit losses. Switching losses can be reduced by reducing the PWM (Pulse Width Modulation) switching frequency. The general strategy for reducing the loss of the control circuit is to extend the time of the entire loop control. When the control circuit detects that the secondary circuit needs to work, the control circuit will send a signal to the isolator (such as an optocoupler, magnetic coupler, capacitive coupler or other digital isolation methods) to pass the signal to the primary controller. The primary controller generates a PWM signal and sends it to the driver tube, which controls the driver tube to generate the desired voltage and provide it to the secondary.

[0004] However, the existing traditional adapter structure also needs to maintain a stable secondary output voltage in standby mode. The more accurate the secondary output voltage is or the narrower the output voltage range is, the greater the power consumption required by the output voltage control loop circuit, and the standby power consumption is still high. Summary of the invention

[0005] In view of this, an object of the present invention is to provide a circuit control method and an electronic device, wherein the circuit does not need to maintain a very precise secondary voltage output, thereby further reducing standby power consumption.

[0006] In the first aspect, an embodiment of the present invention provides a circuit control method, the circuit comprising: a self-excited soft start unit, a synchronous rectification module, an isolation unit, and a fast charging circuit unit; the self-excited soft start unit comprises: a pulse width modulation control module and a self-excited soft start module; the isolation unit comprises: a receiving module and a transmitting module; the fast charging circuit unit comprises an insertion detection module and other high-frequency modules; the method comprises: when the secondary fast charging circuit unit detects a startup instruction for a low power consumption mode, the fast charging circuit unit turns off the power of the synchronous rectification module and the transmitting module of the isolation unit; the self-excited soft start unit turns off the power of all the receiving modules of the isolation unit except the receiving detection module; the self-excited soft start unit turns off the power of other high-frequency modules to maintain the power supply of the receiving detection module and the low-frequency circuit of the receiving module of the isolation unit.

[0007] In an optional embodiment of the present application, the above method also includes: when a startup instruction for the low power mode is detected, the self-excited soft start unit switches to a clock with a duty cycle less than or equal to 5 / 95; wherein the duty cycle is related to the actual circuit and topology.

[0008] In an optional embodiment of the present application, after the self-excited soft start unit shuts off the power of all receiving modules of the isolation unit except the receiving detection module, the method further includes: the output voltage of the self-excited soft start unit keeps rising or keeps falling.

[0009] In an optional embodiment of the present application, the above-mentioned self-excited soft start unit detects the voltage of the auxiliary winding of the circuit; if the voltage of the auxiliary winding is greater than a preset first threshold value, the clock duty cycle of the self-excited soft start unit is reduced or the clock frequency of the self-excited soft start unit is lowered, so that the voltage of the auxiliary winding drops until the voltage is lower than a second threshold value; if the voltage of the auxiliary winding is less than the preset second threshold value, the clock duty cycle of the self-excited soft start unit is increased or the clock frequency of the self-excited soft start unit is increased, so that the voltage of the auxiliary winding rises until the voltage is higher than the first threshold value.

[0010] In an optional embodiment of the present application, the insertion detection module is powered by a voltage caused by drain resonance of the MOS tube.

[0011] In an optional embodiment of the present application, the above method also includes: when the insertion detection module detects that a load is inserted, turning on the low voltage difference regulator module inside the fast charging circuit unit to enable the fast charging circuit unit to work; the fast charging circuit unit powers the transmitting module of the isolation unit, and the detection circuit of the receiving module of the isolation unit receives the PWM signal sent by the fast charging circuit unit.

[0012] In an optional embodiment of the present application, the above method also includes: when the output voltage of the fast charging circuit unit is stable, determining the fast charging protocol of the inserted load; and adjusting the frequency or duty cycle of the supply to the self-excited soft start unit based on the fast charging protocol of the load.

[0013] In an optional embodiment of the present application, the above-mentioned pulse width modulation control module includes: a first oscillation circuit, a second oscillation circuit, a switching switch and a feedback signal failure detection signal; the second oscillation circuit includes: an RC oscillator, and the duty cycle of the RC oscillator is 1 / 99; the ratio of the operating frequency of the second oscillation circuit to the operating frequency of the first oscillation circuit is greater than or equal to 1 / 6.

[0014] In an optional embodiment of the present application, the above method also includes: determining whether the feedback signal failure detection signal input by the isolation unit fails; if the feedback signal failure detection signal fails, the switching switch switches the circuit to standby mode, and the second oscillation circuit outputs a PWM signal.

[0015] In a second aspect, an embodiment of the present invention further provides an electronic device, which is used to execute the above-mentioned circuit control method.

[0016] The embodiments of the present invention bring the following beneficial effects:

[0017] The embodiment of the present invention provides a circuit control method and electronic device, the circuit includes: a self-excited soft start unit, a synchronous rectification module, an isolation unit, and a fast charging circuit unit; the self-excited soft start unit includes: a pulse width modulation control module and a self-excited soft start module; the isolation unit includes: a receiving module and a transmitting module; the fast charging circuit unit includes an insertion detection module and other high-frequency modules; when the fast charging circuit unit detects a startup instruction for a low power consumption mode, the fast charging circuit unit turns off the power supply except the synchronous rectification module, the transmitting module of the isolation unit, and the insertion detection circuit of the fast charging circuit unit; the self-excited soft start unit turns off the power supply of the circuit of the receiving module except the receiving detection and the high-frequency module; the self-excited soft start unit turns off the power supply of other high-frequency modules to maintain the power supply of the receiving detection module. In this way, the circuit does not need to maintain a very accurate secondary voltage output, thereby further reducing the standby power consumption.

[0018] Other features and advantages of the present disclosure will be set forth in the following description, or some features and advantages may be inferred or unambiguously determined from the description, or may be learned by implementing the above-mentioned technology of the present disclosure.

[0019] In order to make the above-mentioned objectives, features and advantages of the present disclosure more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of a low standby power consumption circuit structure of an existing adapter provided by an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of a low standby power consumption circuit structure of a secondary protocol unit of an existing adapter provided by an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of a zero standby power consumption circuit structure provided by an embodiment of the present invention;

[0024] Figure 4 A flow chart of a circuit control method provided by an embodiment of the present invention;

[0025] Figure 5 A schematic diagram of the circuit structure of an existing adapter ACDC PWM controller provided by an embodiment of the present invention;

[0026] Figure 6 A schematic diagram of the circuit structure of an adapter ACDC PWM controller provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] At present, the adapter requires that the standby power consumption must be lower than a certain standard before it can be sold on the market; the losses caused by the entire path of the adapter roughly include: 1. conduction loss, 2. switching loss, 3. control circuit loss.

[0029] Among them, because there is no large load change and no frequent switching in the standby state, the conduction loss can be ignored. The way for adapters on the market to achieve zero power consumption or low power consumption in standby is to reduce switching losses and control circuit losses. Reducing switching losses can be achieved by reducing the PWM switching frequency. The general strategy for reducing the loss of the control circuit is to extend the time of the entire loop control. When the control circuit detects that the secondary circuit needs to work, the control circuit will send a signal to the isolator (such as an optocoupler, magnetic coupler, capacitive coupler or other digital isolation methods) to pass the signal to the primary controller. The primary controller generates a PWM signal and sends it to the driver tube, which controls the driver tube to generate the desired voltage and provide it to the secondary.

[0030] See also Figure 1 A schematic diagram of a low standby power consumption circuit structure of an existing adapter is shown in FIG. Figure 2 The figure shows a schematic diagram of a low standby power consumption circuit structure of a secondary protocol unit of an existing adapter.

[0031] like Figure 1 As shown, Figure 1The modules in the dotted line that require voltage to work in the entire circuit include: primary control circuit module and isolation module. If it is an optocoupler or other digital isolation method, the related circuits need to be powered, as well as the secondary synchronous rectification circuit and the fast charging protocol detection circuit; if it is an optocoupler isolation, the voltage stabilization circuit needs to work, and if it is a digital isolation method, both the sending and receiving ends need to be powered.

[0032] like Figure 1 and Figure 2 As shown, Figure 2 and Figure 1 The difference in the circuits is whether the secondary protocol unit has power partitioning when in low power mode. During low power outage, only the insertion detection related circuits are powered, and other high-frequency modules of the protocol unit are powered off. Figure 2 Although relatively Figure 1 The standby power consumption is low, but Figure 2 In standby mode, the secondary output voltage needs to be maintained stable. This part of the circuit still needs to accurately detect whether the output voltage is within the expected range.

[0033] Based on this, a circuit control method and an electronic device provided in an embodiment of the present invention specifically provide a new circuit structure with zero standby power consumption and a control method thereof. The circuit does not need to maintain a very precise secondary voltage output, thereby further reducing standby power consumption.

[0034] To facilitate understanding of this embodiment, a circuit control method disclosed in an embodiment of the present invention is first introduced in detail.

[0035] Embodiment 1:

[0036] An embodiment of the present invention provides a circuit control method, wherein the circuit includes: a self-excited soft start unit, a synchronous rectification module, an isolation unit, and a fast charging circuit unit; the self-excited soft start unit includes: a pulse width modulation control module and a self-excited soft start module; the isolation unit includes: a receiving module and a transmitting module; the fast charging circuit unit includes an insertion detection module and other high-frequency modules.

[0037] See also Figure 3 A schematic diagram of a zero standby power consumption circuit structure is shown in FIG. Figure 3 The figure shows a novel circuit structure with zero standby power consumption provided by the present embodiment, and the modules that need to be powered are represented by the dotted lines. The difference between the modules that need to be powered in standby mode in the present embodiment and the modules that need to work in standby mode in the traditional circuit structure is that only the insertion detection module of the secondary wake-up circuit in the present embodiment needs to work, and other high-frequency modules do not need to be powered, even the synchronous rectification module and the isolation unit circuit.

[0038] like Figure 3As shown, the biggest differences between the embodiment of the present invention and the traditional circuit structure in standby mode are: 1. Power supply for insertion detection; 2. The primary AC-DC (alternating current-direct current) PWM controller (i.e., the pulse width modulation control module of this embodiment) or the receiving detection circuit of the self-excited soft start module automatically switches to the default minimum PWM duty cycle output or PFM (pulse frequency modulation) mode when no feedback signal from the secondary is received; 3. The primary AC-DC PWM controller or the self-excited soft start circuit detects the voltage of the auxiliary coil to adjust the voltage output to the secondary to ensure that the secondary output voltage does not exceed the expected value.

[0039] Based on the above description, see Figure 4 A flow chart of a circuit control method is shown, the circuit control method comprises the following steps:

[0040] Step S402: When the secondary fast charging circuit unit detects a start instruction of the low power consumption mode, the fast charging circuit unit turns off the power of the synchronous rectification module and the transmitting module of the isolation unit.

[0041] When a low power mode startup instruction is detected, the fast charging circuit unit shuts off the power of the entire secondary circuit except for the power of the insertion detection circuit of the fast charging circuit unit and other modules such as the synchronous rectification module and the transmitting module of the isolation unit.

[0042] like Figure 3 As shown, in this embodiment, the AC-DC PWM control unit (i.e., the pulse width modulation control module) and the self-excitation soft start module can be combined into a self-excitation soft start unit. When the system detects that it needs to be in a low power consumption mode (i.e., a start instruction of the low power consumption mode), the power supply of the M2 MOS synchronous rectification module will be turned off.

[0043] In addition, the fast charging circuit unit can also shut down the power supply of the transmitting module.

[0044] Step S404: the self-excited soft start unit turns off the power of all receiving modules of the isolation unit except the receiving detection module.

[0045] like Figure 3 As shown, the self-excited soft start unit of this embodiment can also turn off the power of the circuits of the receiving module of the isolation unit except the receiving detection and the high-frequency circuit module.

[0046] Step S406 : the self-excited soft start unit turns off the power of other high-frequency modules and maintains the power supply of the insertion detection module.

[0047] like Figure 3As shown, the entire system of this embodiment can also shut down the power of other high-frequency modules of the new fast charging circuit unit except the insertion detection module, and only maintain the power supply of the insertion detection module of the new fast charging circuit unit.

[0048] The embodiment of the present invention provides a circuit control method, the circuit includes: a self-excited soft start unit, a synchronous rectification module, an isolation unit, and a fast charging circuit unit; the self-excited soft start unit includes: a pulse width modulation control module and a self-excited soft start module; the isolation unit includes: a receiving module and a transmitting module; the fast charging circuit unit includes an insertion detection module and other high-frequency modules; when a startup instruction of a low power mode is detected, the fast charging circuit unit turns off all power supplies except the insertion detection module, such as the synchronous rectification module and the power supply of the transmitting module of the isolation unit; the self-excited soft start unit turns off all power supplies of the circuit and the high-frequency circuit module except the receiving detection of the receiving module; the self-excited soft start unit turns off all power supplies of other high-frequency modules to maintain the power supply of the receiving detection module. In this way, the circuit does not need to maintain a very accurate secondary voltage output, thereby further reducing the standby power consumption.

[0049] In some embodiments, when a startup instruction of the low power consumption mode is detected, the self-excited soft start unit switches to a clock with a duty cycle less than or equal to 5 / 95; wherein the duty cycle is related to the actual circuit and topology.

[0050] When the system detects that it needs to be in low power mode, the self-excited soft start unit can switch to its own low-frequency non-traditional 50 / 50 (for example, 5 / 95) duty cycle clock. The duty cycle may be related to the actual circuit and topology, and the duty cycle in low power mode may be smaller than 5 / 95.

[0051] In some embodiments, after the self-excitation soft start unit turns off the power of the receiving module except the receiving detection module and the high-frequency module, the method further includes: the output voltage of the self-excitation soft start unit keeps rising or keeps falling.

[0052] like Figure 3 As shown, because the power supplies of the isolation unit and the synchronous rectification module of the M2 MOS are turned off, the primary self-excited soft start unit has no feedback signal to adjust the output voltage, which will cause the output voltage to continue to rise or fall.

[0053] In some embodiments, the self-excited soft start unit detects the voltage of the auxiliary winding of the circuit; if the voltage of the auxiliary winding is greater than a preset first threshold, the clock duty cycle of the self-excited soft start unit is reduced or the clock frequency of the self-excited soft start unit is lowered so that the voltage of the auxiliary winding drops until the voltage is lower than a second threshold; if the voltage of the auxiliary winding is less than the preset second threshold, the clock duty cycle of the self-excited soft start unit is increased or the clock frequency of the self-excited soft start unit is increased so that the voltage of the auxiliary winding rises until the voltage is higher than the first threshold.

[0054] The self-excited soft start unit will detect the voltage of the auxiliary winding. When it is detected that the voltage of the auxiliary winding is greater than the preset first threshold value Vmax, the clock duty cycle of the self-excited soft start will be reduced or the clock frequency of the self-excited soft start will be lowered; conversely, when it is detected that the voltage of the auxiliary winding is less than the preset second threshold value (for example, 3.3V), the clock duty cycle of the self-excited soft start will be increased or the clock frequency of the self-excited soft start will be increased.

[0055] In some embodiments, the insertion detection module is powered by a voltage caused by a drain resonance of a MOS tube.

[0056] like Figure 3 As shown in FIG. 1 , the power supply of the insertion detection module of the new fast charging circuit unit is powered by the voltage caused by the resonance of the drain Dram terminal of the M2 MOS. Because at this time, only the insertion detection module has power supply in the entire secondary, the power loss is very small.

[0057] In some embodiments, when the insertion detection module detects that a load is inserted, the low voltage difference regulator module inside the fast charging circuit unit is turned on to enable the fast charging circuit unit to work; the fast charging circuit unit supplies power to the isolation unit transmitting module and the synchronous rectification module, and the isolation unit receiving detection circuit receives the PWM signal sent by the fast charging circuit unit, and switches from a low-frequency and low-power consumption mode to a normal working mode.

[0058] When the insertion detection module detects that a load is inserted, it will turn on the low-dropout regulator (LDO) module inside the new fast charging circuit unit to allow the new fast charging circuit unit to work, so that the isolation unit can receive the default PWM signal sent by the new fast charging circuit unit.

[0059] In some embodiments, when the output voltage of the fast charging circuit unit is stabilized, the fast charging protocol of the inserted load is determined; and the frequency or duty cycle supplied to the self-excited soft start unit is adjusted based on the fast charging protocol of the load.

[0060] When the output voltage of the new fast charging circuit unit is stable, it can be determined which fast charging protocol is used to charge the inserted load. After determining the required output voltage, the frequency or duty cycle of the self-excited soft start unit can be adjusted to achieve the purpose of adjusting the output voltage.

[0061] like Figure 1 , Figure 2 and Figure 3 The dotted box shown is the module that needs to work or power in the standby mode. Figure 1 and Figure 2 As shown in the figure, a stable secondary output voltage needs to be maintained during standby. The more accurate the secondary output voltage is or the narrower the output voltage range is, the greater the power consumption required by the output voltage control loop circuit. Figure 3 The circuit of the embodiment of the present invention shown does not need to maintain a very accurate secondary voltage output. In the standby mode, the power consumption of the newly added oscillator circuit 2 is smaller than that of the original oscillator circuit 1 .

[0062] Embodiment 2:

[0063] This embodiment provides another circuit control method, which is implemented on the basis of the above embodiment. This embodiment focuses on describing the implementation of the pulse width modulation control module.

[0064] See also Figure 5 A schematic diagram of the circuit structure of an existing adapter ACDC PWM controller is shown in FIG. Figure 5 The frequency compensation circuit in the circuit will adjust the output frequency of the oscillator circuit based on the input signal from the isolation unit and then output the PWM frequency. The dotted box indicates that the modules that need to be powered in standby mode, such as the oscillator circuit, frequency compensation, slope compensation, and 3-way comparator, need to work. Even if the operating frequency can be reduced in standby mode to reduce the average current during operation, these modules still need to be powered all the time, resulting in static current loss.

[0065] In some embodiments, the pulse width modulation control module includes: a first oscillation circuit (i.e., oscillation circuit 1), a second oscillation circuit (i.e., oscillation circuit 2), a switching switch, and a feedback signal failure detection signal; the second oscillation circuit includes: a low-frequency oscillator such as a 10KHz RC oscillator, the duty cycle of the RC oscillator is 1 / 99, the frequency and default duty cycle of this oscillator are related to the topology and load of the system; the ratio of the operating frequency of the second oscillation circuit to the operating frequency of the first oscillation circuit is greater than or equal to (for example: 1 / 6 or a higher ratio such as 1 / 20).

[0066] See also Figure 6 A schematic diagram of an adapter ACDC PWM controller circuit structure is shown. Figure 6 The ACDCPWM controller shown is the pulse width modulation control module of this embodiment. Figure 5 and Figure 6 As shown, the differences between the traditional ACDC PWM controller and the ACDC PWM controller of this embodiment are: oscillation circuit, feedback signal failure detection and switching switch. The oscillation circuit 1 of the embodiment of the present invention is the same as the oscillation circuit used in the ACDC PWM of the traditional adapter; the oscillation circuit 2 is an RC oscillator with a low-frequency clock such as 10KHz and the duty cycle (duty cycle) output by this oscillator is not 50 / 50, but 1 / 99; the oscillation circuit 2 defaults to high time accounting for 1% of a cycle and low time accounting for 99% of a cycle. The operating frequency of this oscillation circuit 2 is at least 1 / 6 of the traditional operating frequency of the oscillation circuit 1. Taking the standby operating frequency of 1 / 6 as an example, the dynamic power consumption of the oscillation circuit 2 in the standby mode is 1 / 6 of that of the oscillation circuit 1, so the standby operating frequency can use a higher ratio such as 1 / 20 within the allowable range to reduce the power consumption in standby mode.

[0067] like Figure 5 and Figure 6 As shown, Figure 5 and Figure 6 The modules that need power supply to work in standby mode are indicated by dotted boxes. Figure 5 The number of modules that need to be powered during standby is Figure 6 There are many modules that need power supply to work. Figure 6 Compared with the circuit structure Figure 5 An oscillation circuit 2 is added. The oscillation circuit 2 will work only when in standby mode and the oscillation circuit 1 will be powered off. This is because the dynamic power consumption caused by the switch can be saved, and the frequency of the oscillation circuit 2 is at least 1 / 6 of the frequency of the oscillation circuit 1, and the dynamic power consumption of the switch is at least 1 / 6. Figure 6 In standby mode Figure 5 There are fewer working modules, less standby power consumption and leakage current. A duty cycle of 1 / 99 means that high and low account for 1% and 99% of the entire cycle.

[0068] In some embodiments, it is determined whether the feedback signal failure detection signal input by the isolation unit fails; if the feedback signal failure detection signal fails, the switch switches the circuit to the standby mode, and the second oscillation circuit outputs the PWM signal.

[0069] The feedback signal failure detection in the embodiment of the present invention is to detect whether the signal input from the isolation unit fails. If it fails, the selection switch is switched to the standby mode, and the oscillation circuit 2 provides the output PWM signal.

[0070] The feedback signal failure detection standard will vary depending on the type of isolation unit; when the isolation unit is a digital isolation type such as magnetic coupling, capacitive coupling, millimeter wave or similar isolation method, if the signal sent by the secondary is not received for more than the period of the oscillation circuit 2, the secondary is considered to have failed, and the feedback signal failure detection signal is set to high, and then the primary enters the standby mode. When the isolation unit is an optocoupler device, it depends on how the system handles the secondary power supply. If the power supply of the secondary optocoupler part is turned off, the processing method is similar to the digital isolation method. If the optocoupler feedback signal is not received within the period of the oscillation circuit 2, it is considered to have failed. If the optocoupler is always powered, the embodiment of the present invention will not trigger the feedback signal failure. However, the present invention will still turn off the power supply of the fast charging circuit unit except for the insertion detection circuit, and include a synchronous rectification circuit.

[0071] When the AC-DC PWM module in the adapter self-excitation soft start unit of the embodiment of the present invention is in standby mode, it does not rely on the feedback signal of the secondary to adjust the duty cycle of the primary AC-DC PWM. Because the secondary circuit does not control the primary PWM controller for a long time, its output will cause the secondary voltage to fluctuate. The voltage fluctuation range is 3.3V~Vmax, where the maximum voltage supported by Vmax is determined according to the maximum power supported by the load end. If the maximum power supported is 28V5A, the Vmax voltage is 28V.

[0072] For example, if the maximum power is 48V5A, then Vmax is 48V. The AC-DC PWM controller of the embodiment of the present invention will detect the voltage of the auxiliary coil. When the voltage exceeds the expected voltage Vmax, the oscillation circuit 2 of the embodiment of the present invention will stop outputting the PWM signal so that the secondary voltage starts to drop from Vmax. When it drops to about 3.3V, the oscillation circuit 2 of the embodiment of the present invention starts to oscillate and the secondary voltage will slowly rise from 3.3V.

[0073] When the secondary insertion detection circuit of the embodiment of the present invention detects that a device is inserted, the power supply of the secondary circuit, such as the novel fast charging circuit unit and the isolation circuit unit, is turned on so that the secondary circuit can start working. After the secondary circuit works normally, it starts to send signals to the primary module through the isolation unit. After the primary ACDC PWM circuit finds that the feedback signal failure detection becomes low, it switches the system back to the normal working mode.

[0074] In summary, the above circuit provided by the embodiment of the present invention can be applied to application scenarios such as adapters, power strips, energy storage, AC-DC primary voltage reduction, AC-DC secondary voltage reduction, etc.; in the embodiment of the present invention, the secondary only needs to be powered by the insertion detection circuit when in standby mode; the insertion detection circuit of the embodiment of the present invention is powered by the reverse bias of the synchronous rectifier MOS tube in standby mode, and the current of the insertion detection circuit in standby mode is 1uA or even less than 100nA of power consumption; in the embodiment of the present invention, the isolation circuit does not need to be powered and work when in standby mode; in the embodiment of the present invention, only the insertion detection of the secondary needs to be powered when in standby mode, and other high-frequency modules do not need to be powered.

[0075] In the embodiment of the present invention, when in standby mode, the self-excited soft-start circuit unit does not receive a feedback signal from the secondary and sets the duty cycle of the PWM output to the minimum mode, and the clock is switched to the internal oscillation circuit 2 for generation; the embodiment of the present invention supports primary PWM and PFM control modes at zero standby power consumption; in the embodiment of the present invention, when in standby mode, the self-excited soft-start circuit detects the voltage of the auxiliary coil and adjusts the PWM output duty cycle to ensure that the secondary output voltage is within the expected range; the transformer secondary voltage output range of the embodiment of the present invention is 3V~Vmax, where Vmax is determined by the highest voltage at the maximum power supported.

[0076] The zero standby power consumption of the embodiment of the present invention is suitable for isolation circuits of optocouplers, magnetic couplers, capacitive couplers and other digital isolation methods; the zero standby power consumption related circuit design of the embodiment of the present invention is easier than the zero standby power consumption related circuit of the traditional adapter under the same standby power consumption and the specifications are lower than the traditional standby power consumption circuit indicators.

[0077] The embodiment of the present invention uses open-loop mode control in the zero standby power consumption mode, and switches back to the closed-loop control mode in the normal working mode; in the zero standby power consumption mode, the embodiment of the present invention can turn off the PFC (Power Factor Correction) and LLC (Inductor-Inductor-Capacitor) circuits if the system has them, that is, the primary stage switches the PFC and LLC to the bypass mode.

[0078] The self-excited soft start in the embodiment of the present invention is a part of the functions of the traditional AC-DC PWM controller, such as high voltage power supply, PWM and PFM mode switching; the driving tubes supported by the embodiment of the present invention include traditional silicon MOS tubes, gallium nitride (GaN) tubes and silicon carbide (SiC) tubes.

[0079] Because the output voltage of the embodiment of the present invention in standby mode is in a wide range and does not require maintaining a specific voltage in standby mode, the design and implementation of the circuit and the power consumption are simpler than those of the circuit in normal working mode. Because the embodiment of the present invention has fewer working modules in standby mode than the existing traditional adapter, the power consumption is better than the traditional adapter solution.

[0080] Embodiment three:

[0081] Corresponding to the above method embodiments, an embodiment of the present invention provides an electronic device for executing the circuit control method provided by the above embodiment.

[0082] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system and / or device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0083] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0084] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0085] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0086] Finally, it should be noted that the above embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A circuit control method, characterized in that: The circuit includes: a self-excited soft start unit, a synchronous rectification module, an isolation unit, and a fast charging circuit unit; the self-excited soft start unit includes: a pulse width modulation control module and a self-excited soft start module; the isolation unit includes: a receiving module and a transmitting module; the fast charging circuit unit includes an insertion detection module and other high-frequency modules; the method includes: When the secondary fast charging circuit unit detects a start instruction of the low power consumption mode, the fast charging circuit unit turns off the power of the synchronous rectification module and the transmitting module of the isolation unit; The self-excited soft start unit turns off the power of all receiving modules of the isolation unit except the receiving detection module; The self-excited soft start unit turns off the power supplies of the other high-frequency modules and maintains the power supply of the insertion detection module.

2. The method according to claim 1, characterized in that The method further comprises: When a startup instruction of the low power consumption mode is detected, the self-excited soft start unit switches to a clock with a duty cycle less than or equal to 5 / 95; wherein the duty cycle is related to the actual circuit and topology.

3. The method according to claim 1, characterized in that After the step of the self-excitation soft start unit turning off the power of all the receiving modules of the isolation unit except the receiving detection module, the method further includes: The output voltage of the self-excited soft start unit keeps rising or keeps falling.

4. The method according to claim 1, characterized in that The method further comprises: The self-excited soft start unit detects the voltage of the auxiliary winding of the circuit; If the voltage of the auxiliary winding is greater than a preset first threshold, reducing the clock duty cycle of the self-excited soft start unit or lowering the clock frequency of the self-excited soft start unit, so that the voltage of the auxiliary winding decreases until the voltage is lower than a preset second threshold; If the voltage of the auxiliary winding is less than the second threshold, the clock duty cycle of the self-excited soft start unit is increased or the clock frequency of the self-excited soft start unit is increased, so that the voltage of the auxiliary winding rises until the voltage is higher than the first threshold.

5. The method according to claim 1, characterized in that The insertion detection module is powered by a voltage caused by the drain resonance of the MOS tube.

6. The method according to claim 1, characterized in that The method further comprises: When the insertion detection module detects that a load is inserted, the low voltage dropout regulator module inside the fast charging circuit unit is turned on to make the fast charging circuit unit work; The fast charging circuit unit supplies power to the transmitting module of the isolation unit, and the detection circuit of the receiving module of the isolation unit receives the PWM signal sent by the fast charging circuit unit.

7. The method according to claim 6, characterized in that The method further comprises: When the output voltage of the fast charging circuit unit is stable, determining the fast charging protocol of the inserted load; The frequency or duty cycle supplied to the self-excited soft start unit is adjusted based on the fast charging protocol of the load.

8. The method according to any one of claims 1 to 7, characterized in that: The pulse width modulation control module includes: a first oscillation circuit, a second oscillation circuit, a switching switch and a feedback signal failure detection signal; The second oscillation circuit includes: an RC oscillator, the duty cycle of the RC oscillator is 1 / 99; the ratio of the operating frequency of the second oscillation circuit to the operating frequency of the first oscillation circuit is greater than or equal to 1 / 6.

9. The method according to claim 8, characterized in that The method further comprises: Determining whether a feedback signal failure detection signal input by the isolation unit fails; If the feedback signal failure detection signal fails, the switch switches the circuit to a standby mode, and the second oscillation circuit outputs a PWM signal.

10. An electronic device, characterized in that: The electronic device is used to execute the circuit control method according to any one of claims 1 to 9.

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