CN220156405U

CN220156405U - Auxiliary power supply control circuit, auxiliary power supply and electronic equipment

Info

Publication number: CN220156405U
Application number: CN202320552900.1U
Authority: CN
Inventors: 骆锋; 赵密; 陈熙; 王雷
Original assignee: Ecoflow Technology Ltd
Current assignee: Ecoflow Technology Ltd
Priority date: 2023-03-17
Filing date: 2023-03-17
Publication date: 2023-12-08
Anticipated expiration: 2033-03-17

Abstract

The present application relates to the field of electronic circuits, and in particular, to a control circuit for an auxiliary power supply, and an electronic device. The control circuit of the auxiliary power supply comprises a main control circuit, a first driving circuit, a level conversion circuit and a second driving circuit, wherein the main control circuit is used for outputting a first control signal to enable the first driving circuit to generate a first driving signal when the electronic equipment enters standby, and the level conversion circuit generates a first stop signal according to the first driving signal to drive the internal power supply circuit to stop working so as to enable the auxiliary power supply to be closed; the second driving circuit enables the external power supply circuit to be switched to a to-be-started state according to the first driving signal, and the external power supply circuit works when an external power supply is connected; therefore, the application can realize the effects of closing the auxiliary power supply when the electronic equipment is in standby, automatically starting the auxiliary power supply when the external power supply is connected to the electronic equipment, reducing the power consumption when the electronic equipment is in standby, automatically starting the work when the external power supply is connected to the electronic equipment, and improving the working performance of the electronic equipment.

Description

Auxiliary power supply control circuit, auxiliary power supply and electronic equipment

Technical Field

The present application relates to the field of electronic circuits, and in particular, to a control circuit for an auxiliary power supply, and an electronic device.

Background

The auxiliary power supply is used for providing the working voltage required by the target circuit at the initial starting stage of other circuits and stopping power supply after the other circuits stably output. The power supply circuit of the auxiliary power supply may include an AC (Alternating Current) power supply circuit and a DC (Direct Current) power supply circuit, and outputs a plurality of required voltages of the target circuit after voltage conversion by an internal transformer of the auxiliary power supply.

Main control chips are arranged in the AC power supply circuit and the DC power supply circuit, and the main control chips are used for controlling the on and off of the AC power supply circuit and the DC power supply circuit. In the related art, when an electronic device (such as an energy storage device or a power converter) is in a standby state, an auxiliary power supply is still in an on state, which generates a large energy consumption.

Disclosure of Invention

In view of the above, the present utility model provides a control circuit of an auxiliary power supply, an auxiliary power supply and an electronic device, which are used for solving the problem that in the related art, when the electronic device is in a standby state, the auxiliary power supply is still in an on state, and thus larger energy consumption is generated.

In a first aspect, the present utility model provides a control circuit of an auxiliary power supply supplied from one of an internal power supply circuit and an external power supply circuit, the control circuit comprising:

The main control circuit is used for outputting a first control signal when the electronic equipment works in a standby mode;

the first driving circuit is connected to the main control circuit and used for generating a first driving signal when receiving the first control signal;

the level conversion circuit is connected with the first driving circuit and the internal power supply circuit and is used for converting the level of the first driving signal to obtain a first stop signal when the first driving signal is received; the first stop signal is used for controlling the internal power supply circuit to stop working;

the second driving circuit is connected to the external power supply circuit and is used for generating a first enabling signal to the external power supply circuit when receiving the first driving signal so as to control the external power supply circuit to be switched to a state to be started; and when the external power supply circuit is in a to-be-started state, starting under the control of the received external power supply signal.

In one embodiment, the first driving circuit includes a first current limiting resistor, a first voltage dividing resistor, a first capacitor and a first switching tube, wherein a control end of the first switching tube is connected to the main control circuit through the first current limiting resistor and is grounded through the first voltage dividing resistor, the first capacitor is connected in parallel with the first voltage dividing resistor, a first conducting end of the first switching tube is connected to the level conversion circuit, and a second conducting end of the first switching tube is grounded.

In one embodiment, the level conversion circuit includes a second capacitor, a third capacitor, a first zener diode, a first pull-up resistor and a second switch tube, where a cathode of the first zener diode and one end of the second capacitor are connected to the first driving circuit, another end of the second capacitor is grounded, an anode of the first zener diode is connected to a control end of the second switch tube, an anode of the first diode is connected to a control end of the second switch tube, a cathode of the first diode is connected to a pull-up power supply, another end of the third capacitor is grounded, the first pull-up resistor is connected between the control end of the second switch tube and the pull-up power supply, and a first conductive end of the second switch tube is connected to an enable end of the internal power supply circuit, and a second conductive end of the second switch tube is grounded.

In one embodiment, the second driving circuit is further connected to the internal power supply circuit, and the second driving circuit is configured to output the second driving signal to the internal power supply circuit when the external circuit is operated, so as to control the internal power supply circuit to stop supplying power to the auxiliary power supply.

In one embodiment, the second driving circuit includes:

the first enabling module is connected with the enabling end of the external power supply circuit and used for controlling the external power supply circuit to work or stop working;

the second enabling module is connected with the enabling end of the internal power supply circuit and used for controlling the internal power supply circuit to work or stop working;

the sampling module is connected with the input end of the internal power supply circuit and is used for detecting the voltage of the input end of the internal power supply circuit and outputting a sampling voltage;

the driving module is connected with the sampling module, the first enabling module and the second enabling module and used for controlling the first enabling module to output the first enabling signal and controlling the second enabling module to output the first stopping signal when the sampling voltage is smaller than a threshold value so that the first enabling module controls the external power supply circuit to work and the second enabling module controls the internal power supply circuit to stop working; the driving module is further configured to control the first enabling module to output a second stop signal and control the second enabling module to output a second enabling signal when the sampling voltage is greater than or equal to a threshold value, so that the first enabling module controls the external power supply circuit to stop working, and the second enabling module controls the internal power supply circuit to work;

And a standby module: the first end of the standby module is connected with the driving module, the second end of the standby module is connected with the first driving circuit, and the standby module is used for controlling the driving module to stop when receiving the first driving signal so as to enable the first enabling module to start when receiving an external power supply signal.

In one embodiment, the standby module includes a second zener diode, an anode of the second zener diode is connected to the driving module as a first end of the standby module, and a cathode of the second zener diode is connected to the first driving circuit as a second end of the standby module.

In one embodiment, the sampling module includes a first voltage divider and a second voltage divider, a first end of the first voltage divider is connected to an input end of the internal power supply circuit, a second end of the first voltage divider is connected to a first end of the second voltage divider, a second end of the second voltage divider is grounded, and a first end of the second voltage divider is connected to an output end of the sampling module.

In a second aspect, the present application further provides an auxiliary power supply, including an external power supply circuit, an internal power supply circuit, a transformer, at least one voltage conversion circuit, and a control circuit as described above, where the external power supply circuit, the internal power supply circuit, and the voltage conversion circuit are respectively coupled to the transformer, and the transformer is configured to receive electrical energy input from the external power supply circuit and electrical energy input from the internal power supply circuit, and output electrical energy through the voltage conversion circuit.

In a third aspect, the application also provides an electronic device comprising an auxiliary power supply as described above.

In one embodiment, the electronic device further comprises a battery comprising a first power outlet for powering the internal power supply circuit of the auxiliary power supply and a second power outlet for powering a main control circuit in the control circuit of the auxiliary power supply.

The application can be connected with the external power supply circuit by arranging the second driving circuit, so that when the first driving signal is received, a first enabling signal is generated to the external power supply circuit to control the external power supply circuit to be switched to a state to be started; in addition, the external power supply circuit can be started under the control of the received external power supply signal when the external power supply circuit is in a state to be started. Therefore, when the electronic equipment works in the standby mode, the external power supply circuit can be switched to a to-be-started state through the second driving circuit; and the external power supply circuit can be controlled to be started when the external power supply signal is received, so that the auxiliary power supply is automatically started when the external power supply signal is received. Therefore, the application can realize the effects of closing the auxiliary power supply when the electronic equipment is in standby, automatically starting the auxiliary power supply when the external power supply is connected to the electronic equipment, reducing the power consumption when the electronic equipment is in standby, automatically starting the work when the external power supply is connected to the electronic equipment, and improving the working performance of the electronic equipment.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic circuit diagram of an electronic device according to an embodiment of the application;

FIG. 2 is a schematic circuit diagram of a control circuit of an auxiliary power supply according to an embodiment of the application;

FIG. 3 is a schematic diagram of a second driving circuit according to an embodiment of the application;

FIG. 4 is a schematic circuit diagram of a second driving circuit according to another embodiment of the present application;

fig. 5 is a schematic block diagram of an electronic device according to an embodiment of the application.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected or indirectly connected to the other element.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

An auxiliary power supply (Switch power supply, SPS) can be arranged in the electronic equipment to provide required working voltage for other circuits in the electronic equipment at the initial stage of starting, and the power supply is stopped after the other circuits work stably. The other circuit may be an inverter circuit or a rectifier circuit in the electronic device.

However, in some electronic devices, when the electronic device enters a standby state, the auxiliary power supply is still in a completely turned-on state, which may generate excessive power consumption. In order to solve the above problems, the present application provides a control circuit of an auxiliary power supply. The application aims to enable the auxiliary power supply to be closed when the electronic equipment enters a standby state so as to reduce energy consumption and switch an external power supply circuit to a state to be started; the external power supply circuit is controlled to start when the external power supply signal is received.

As shown in fig. 1, the auxiliary power supply 100 is powered by one of the external power supply circuit 102 and the internal power supply circuit 104, and the external power supply circuit 102 and the internal power supply circuit 104 may also be components of the auxiliary power supply, such as in fig. 1. The auxiliary power supply 10 further comprises a transformer T1, at least one voltage conversion circuit 106 and a control circuit 10 of the auxiliary power supply 100. The external power supply circuit 102, the internal power supply circuit 104 and the voltage conversion circuit 106 are respectively coupled to a transformer T1, and the transformer T1 is configured to receive an electrical energy input of the external power supply circuit 102 or the internal power supply circuit 104 and output an electrical energy through the voltage conversion circuit 106.

The external power supply circuit 102 may be an AC power supply circuit, which may include a circuit switch M1 connected to an AC source and an AC main control chip controlling the circuit switch. Wherein the alternating current source may be provided by mains. The internal power supply circuit 104 may be a DC power supply circuit, which may include a circuit switch M2 connected to a direct current source and a DC main control chip controlling the circuit switch. Wherein the direct current source may be provided by a battery or a solar input. The AC main control chip can control the work or stop work of the AC power supply circuit, and the DC main control chip can control the work or stop work of the DC power supply circuit.

The auxiliary power supply 100 in the example of fig. 1 adopts a flyback topology power supply structure, and the battery can output 48V voltage to the DC input of the internal power supply circuit 104 under the condition of activation, and controls the magnitude of the DC input through the DC main control chip, then receives the electric energy input of the internal power supply circuit 104 through the transformer T1, and can output 12V voltage to the BUCK circuit through the DC output of the voltage conversion circuit 106. And the battery outputs 12V voltage to the BUCK circuit through a voltage converter inside the battery under the condition of no activation. The BUCK circuit converts the 12V voltage into 5V for output, and an LDO (low dropout linear regulator) is connected behind the BUCK circuit, which can convert the 5V voltage into a stable 3.3V voltage to supply power to the main control circuit of the electronic device. The master control circuit may be a master control chip of the electronic device.

The flyback topology of the auxiliary power supply 100 of the present application may be driven by an AC main control chip of an AC power supply circuit or by a DC main control chip of a DC power supply circuit. When the electronic device is connected to the mains supply, firstly, the AC power supply circuit receives the AC input, and then the AC main control chip works, at this time, the transformer T1 receives the electric energy input of the AC power supply circuit, provides 12V voltage at the DC output through the voltage conversion circuit 106, reduces the voltage through the BUCK circuit, and activates the main control chip of the electronic device after passing through the LDO, so that the main control chip of the electronic device can activate the battery of the electronic device. After the battery of the electronic device is activated, a voltage of 48V is output to supply power to the internal power supply circuit 104 of the auxiliary power supply 100, specifically, the voltage is input through the DC input of the internal power supply circuit 104, at this time, the DC main control chip of the DC power supply circuit starts to work, a switch control signal is output, and the control circuit switch M2 is closed. Simultaneously, the enabling pin of the AC main control chip of the AC power supply circuit is pulled down, and the AC main control chip of the AC power supply circuit stops working; at this time, the power supply of the main control circuit 11 may be provided by the battery or the voltage conversion circuit 106, or both may be provided to power the main control circuit 11 at the same time.

In the inventive concept, when the electronic device is in the standby state, only the main control circuit 11 is kept in the working state, and other circuits (such as the auxiliary power supply 100) are in the non-working state, so that the consumption of the battery power can be reduced. In this way, the present application provides the control circuit 10 of the auxiliary power supply 100, which can control other circuits to stop working after the main control chip of the electronic device receives a corresponding low-power control command when the electronic device enters the low-power mode.

Referring to fig. 1, the control circuit 10 of the auxiliary power supply 100 is connected to the auxiliary power supply 100 of the electronic device, the auxiliary power supply 100 is powered by one of the internal power supply circuit 104 and the external power supply circuit 102, and the control circuit 10 includes a main control circuit 11, a first driving circuit 12, a level shifter circuit 13 and a second driving circuit 14.

The main control circuit 11 is configured to output a first control signal when the electronic device is operating in a standby mode. The first driving circuit 12 is connected to the main control circuit 11 and is used for generating a first driving signal when receiving a first control signal; the level conversion circuit 13 is connected to the first driving circuit 12 and the internal power supply circuit 104, and converts the level of the first driving signal to obtain a first stop signal when the first driving signal is received. The first stop signal is used to control the internal power supply circuit 104 to stop operating. The second driving circuit 14 is connected to the external power supply circuit 102, and is configured to generate a first enable signal to the external power supply circuit when receiving the first driving signal, so as to control the external power supply circuit 102 to switch to a to-be-started state; the external power supply circuit 102 is activated under control of the received external power supply signal when in a ready-to-activate state.

The internal power supply circuit 104 illustratively includes a battery-powered DC power supply circuit that includes a DC master chip that controls whether or not it is powered externally. When the electronic device is operated in the standby mode, the main control circuit 11 outputs a first control signal, and the first driving circuit 12 generates a first driving signal when receiving the first control signal. The level conversion circuit 13 converts the level of the first driving signal to obtain a first stop signal, the enabling end COM1 of the DC main control chip stops working when receiving the first stop signal, and the circuit switch M2 on the loop in the DC power supply circuit is disconnected, so that the auxiliary power supply 100 does not work; at this time, the battery supplies only 12V voltage to the BUCK circuit to supply power to the main control circuit 11 in the standby state, and at this time, only the main control circuit 11 is in the operating state. The external power supply circuit 102 comprises an AC power supply circuit powered by an external AC source, the AC power supply circuit comprises an AC main control chip for controlling whether the AC power supply circuit is powered by the external AC source, the second driving circuit 14 generates a first enabling signal when receiving a first driving signal, the first enabling signal places an enabling end COM2 for controlling the AC main control chip in a released state to be started, when the external power supply circuit 102 is in the state to be started, the AC main control chip of the AC power supply circuit can enter a working state when an external AC source is accessed, the switch M1 of the output switch control signal is controlled to be closed, so that the main control circuit 11 is activated, the main control circuit 11 is led to exit a standby mode, and the electronic equipment enters the working mode; at this time, the battery can be activated to supply the DC power supply circuit with the DC input voltage, the DC main control chip of the DC power supply circuit starts to work, and meanwhile, the enabling end COM2 of the AC main control chip of the AC power supply circuit is pulled down, and the AC main control chip of the AC power supply circuit stops working.

The main control circuit 11 may be a main control chip of an electronic device where the auxiliary power supply 100 is located, or may be an auxiliary controller specifically configured for the auxiliary power supply 100 and connected to the main control chip, where the main control circuit 11 may be implemented by using a single chip, and when the main control circuit 11 performs control of a user or a preset mechanism to enter a standby mode, a first control signal is output to the first driving circuit 12, and the first driving circuit 12 and the level conversion circuit 13 will control the internal power supply circuit 104 to stop working, so that the auxiliary power supply 100 is disconnected from the power supply to reduce energy consumption; in addition, the second driving circuit 14 switches the external power supply circuit 102 to the to-be-started state at this time, so that the auxiliary power supply 100 can wake up with the external power supply to restart, so as to realize automatic start-up of the auxiliary power supply 100 when receiving the external power supply signal. Therefore, the application can realize the effects of closing the auxiliary power supply when the electronic equipment is in standby, automatically starting the auxiliary power supply when the external power supply is connected to the electronic equipment, reducing the power consumption when the electronic equipment is in standby, automatically starting the work when the external power supply is connected to the electronic equipment, and improving the working performance of the electronic equipment.

With continued reference to fig. 1, in one embodiment, the second driving circuit 14 is further connected to the internal power supply circuit 104, and the second driving circuit 14 is further configured to output a second driving signal to the internal power supply circuit 104 when the external power supply circuit 102 is operated, so as to control the internal power supply circuit 104 to stop supplying power to the auxiliary power supply 100. The external power supply circuit 102 and the internal power supply circuit 104 are prevented from simultaneously starting to supply power to the auxiliary power supply 100, so that the electronic equipment is prevented from being damaged.

Referring to fig. 2, in one embodiment, the first driving circuit 12 includes a first current limiting resistor R11, a first voltage dividing resistor R12, a first capacitor C11, and a first switching tube Q11. The control end of the first switching tube Q11 is connected to the main control circuit 11 through a first current limiting resistor R11, and is grounded through a first voltage dividing resistor R12, a first capacitor C11 is connected with the first voltage dividing resistor R12 in parallel, the first conducting end of the first switching tube Q11 is used as an output end SPS_SD of the first driving circuit 12 to be connected to the level conversion circuit 13, and the second conducting end of the first switching tube Q11 is grounded.

The first control signal is limited by the first current limiting resistor R11, is divided by the first voltage dividing resistor R12 and is filtered by the first capacitor C11, and then reaches the control end of the first switching tube Q11 to conduct the first switching tube Q11, so that the level of the first conducting end of the first switching tube Q11 can be pulled down to generate a first driving signal with low level. The first control signal may be a high-level signal, the first switch tube Q11 may be an N-type MOS tube, and the control end, the first conducting end and the second conducting end of the first switch tube Q11 correspond to the gate, the drain and the source of the NMOS tube respectively.

In one embodiment, the level shift circuit 13 includes a second capacitor C12, a third capacitor C13, a first zener diode D11, a first diode D12, a first pull-up resistor R13, and a second switching transistor Q12. One end of the cathode of the first zener diode D11 and one end of the second capacitor C12 are connected to the output end ps_sd of the first driving circuit 12, the other end of the second capacitor C12 is grounded, the anode of the first zener diode D11 is connected to the control end of the second switching tube Q12, the anode of the first diode D12 is connected to the control end of the second switching tube Q12, the cathode of the first diode D12 is connected to the pull-up power Vref, the other end of the third capacitor C13 is grounded, the first pull-up resistor R13 is connected between the control end of the second switching tube Q12 and the pull-up power Vref, the first conducting end of the second switching tube Q12 is connected to the enable end COM1 of the internal power supply circuit 104, and the second conducting end of the second switching tube Q12 is grounded.

In the embodiment of the present application, the second switching tube Q12 may be a PNP transistor, and the control terminal, the first conducting terminal, and the second conducting terminal of the second switching tube Q12 are respectively a base, a collector, and an emitter of the PNP transistor. When the second switching tube Q12 adopts the PNP type triode, the first driving signal with low level can make the second switching tube Q12 turn on, the E pole (emitter) of the second switching tube Q12 generates the first stop signal, and after the enabling end COM1 of the DC main control chip in the DC power supply circuit is connected to pull the enabling pin COM of the DC main control chip low, the DC main control chip can stop working, the auxiliary power supply 100 will not consume energy of the battery side, and the electronic device is in a low power consumption state.

Referring to fig. 3, in one embodiment, the second driving circuit 14 includes a first enabling module 142, a second enabling module 144, a sampling module 146, a driving module 148, and a standby module 149.

The first enabling module 142 is connected to an enabling terminal COM2 of the external power supply circuit 102, and is configured to control the external power supply circuit 102 to operate or stop operating; the second enabling module 144 is connected to the enabling terminal COM1 of the internal power supply circuit 104, and is used for controlling the internal power supply circuit 104 to operate or stop operating.

The sampling module 146 is connected to an input terminal of the internal power supply circuit 104, and is configured to detect a voltage at the input terminal of the internal power supply circuit 104 and output a sampled voltage. The driving module 148 is connected with the sampling module 146, the first enabling module 142, and the second enabling module 144. The driving module 148 is configured to control the first enabling module 142 to output a first enabling signal and control the second enabling module 144 to output a first stopping signal when the sampling voltage output by the sampling module 146 is less than a threshold value, so that the first enabling module 142 controls the external power supply circuit 102 to operate, and the second enabling module 144 controls the internal power supply circuit 104 to stop operating; the driving module 148 is further configured to control the first enabling module 142 to output the second stop signal and control the second enabling module 144 to output the second enabling signal when the sampling voltage is greater than or equal to the threshold value, so that the first enabling module 142 controls the external power supply circuit 102 to stop working, and the second enabling module 144 controls the internal power supply circuit 104 to work.

The first end of the standby module 149 is connected to the input end of the driving module 148, the second end of the standby module 149 is connected to the output end sps_sd of the first driving circuit 12, and the standby module 149 is configured to control the driving module 148 to be turned off when receiving the first driving signal, so that the first enabling module 142 is started when receiving the external power supply signal.

The first enabling module 142 can control the external power supply circuit 102 to operate or stop operating by changing the level state of the enabling terminal COM2 of the AC main control chip of the external power supply circuit 102. The second enabling module 144 can control the internal power supply circuit 104 to operate or stop operating by changing the level state of the enabling terminal COM1 of the DC main control chip of the internal power supply circuit 104. Meanwhile, it can be understood that in the embodiment of the present application, the enabling end of the main control chip is set to be in a high-impedance state or to be in a high-level state, and the enabling end of the main control chip is pulled down to stop the operation, which is taken as an example, to describe the related embodiments. Of course, in actual use, the control pin of the main control chip can be pulled down to start working, which is not limited by the application.

When the sampled voltage is less than the threshold, the voltage at the input end of the internal power supply circuit 104 does not reach the expected voltage, and the internal power supply circuit 104 cannot supply power to the auxiliary power supply 100; at this time, the driving module 148 outputs the first driving voltage to power the external power supply circuit 102, and the internal power supply circuit 104 stops operating. When the sampled voltage is greater than or equal to the threshold, the voltage at the input end of the internal power supply circuit 104 reaches the expected voltage, and at this time, the internal power supply circuit 104 can supply power to the auxiliary power supply 100, and at this time, the driving module 148 outputs the second driving voltage to switch the power supply of the auxiliary power supply 100 from the external power supply circuit 102 to the internal power supply circuit 104. In this way, it is possible to avoid the external power supply circuit 102 and the internal power supply circuit 104 from simultaneously inputting power supply during the start-up phase of the auxiliary power supply 100, and to avoid the occurrence of the situation that the external power supply circuit 102 and the internal power supply circuit 104 are simultaneously disconnected from power supply during the process of turning the external power supply circuit 102 to the internal power supply circuit 104 for power supply. By adopting the scheme of the application, the driving module 148 outputs the same driving signal to realize the simultaneous control of the two power supply circuits, so that only one of the two power supply circuits is always in the working state, the problem that the auxiliary power supply 100 cannot work normally and even the frying machine is caused by the simultaneous starting or closing of the two power supply circuits is avoided, and the stability and the reliability of the circuits are improved.

In addition, when the standby module 149 receives the first driving signal with a low level, the driving module 148 is controlled to be turned off, and at this time, the driving module 148 outputs the first driving voltage, so that the first enabling module 142 is started when receiving the external power supply signal, and the external power supply circuit 102 is enabled to operate, and the internal power supply circuit 104 is stopped to operate.

In one embodiment of the present application, the power supply strategy of the auxiliary power supply 100 is to preferentially supply power from the internal power supply circuit 104, i.e., the DC power supply circuit, when there is a power input at the input of the internal power supply circuit 104 and the voltage is expected. By the arrangement, the auxiliary power supply 100 can be supplied by the DC power supply circuit after the AC power supply circuit is suddenly disconnected, and the situation that the power supply cannot work due to the sudden disconnection of the AC power supply circuit is avoided. In addition, for convenience of use, after the auxiliary power supply 100 enters the standby mode, the external power supply circuit 102 is set in a state to be awakened, and after the user inserts the electronic device into the mains, it is desirable to wake up the auxiliary power supply 100 by the external power supply circuit 102, activate the battery, and let the auxiliary power supply 100 exit the low power consumption mode.

In one embodiment of the present application, referring to fig. 3, the sampling module 146 includes a first voltage divider R1 and a second voltage divider R2, wherein a first end of the first voltage divider R1 is connected to an input end of the internal power supply circuit 104, i.e. correspondingly connected to a DC input; the second end of the first voltage divider R1 is connected to the first end of the second voltage divider R2, the second end of the second voltage divider R2 is grounded, and the first end of the second voltage divider R2 is used as the output end of the sampling module 146 and is further connected to the input end of the driving module 148. It will be appreciated that the voltage divider may be built using more than one resistor. In this embodiment, the first voltage divider R1 includes a resistor, and the second voltage divider R2 is connected in parallel with the third voltage divider R3. It will be appreciated that in other embodiments, the second voltage divider R2 is a resistor, or a plurality of resistors connected in parallel are provided, specifically configured according to the desired voltage dividing ratio.

The sampling module 146 of the present application may further include a capacitor C1 connected in parallel with the second voltage divider R2, and the capacitor C1 may be used to perform a filtering or delay effect. The sampling module 146 divides the electric signal input by DC through the first voltage divider R1 and the second voltage divider R2, so that the damage to the driving module 148 caused by excessive sampling voltage can be avoided, and the driving module 148 can be effectively protected.

In one embodiment of the present application, with continued reference to fig. 3, the driving module 148 of the present application includes a first voltage regulator tube D1, and a control end of the first voltage regulator tube D1 is connected to the sampling module 146, specifically, to the first end of the second voltage divider R2. The cathode of the first voltage stabilizing tube D1 is connected with the first enabling module 142 and the second enabling module 144, and the anode of the first voltage stabilizing tube D1 is grounded. In one embodiment, the first regulator D1 is a controllable precision regulator (e.g., TL 431). The reference electrode of the controllable precise voltage-stabilizing tube is used as the control end of the first voltage-stabilizing tube D1, and the cathode and the anode of the controllable precise voltage-stabilizing tube are respectively used as the cathode and the anode of the first voltage-stabilizing tube D1. The first power VCC is also connected to the first enabling module 142. It can be understood that the on reference voltage of the controllable precision voltage regulator is the above threshold, so that the voltage division ratio of the middle voltage divider of the sampling module 146 can be configured such that: when the sampling voltage is smaller than the threshold value, the controllable precise voltage stabilizing tube is cut off, and the cathode voltage of the controllable precise voltage stabilizing tube is provided by a first power supply VCC and is used as a first driving voltage, namely, a high level; when the sampling voltage is greater than or equal to the threshold value, the controllable precise voltage stabilizing tube is conducted, the first power supply VCC is connected to the grounding end, the cathode of the controllable precise voltage stabilizing tube is pulled down to the ground correspondingly, and the cathode of the controllable precise voltage stabilizing tube outputs a second driving voltage which is the low level. In one embodiment of the present application, the first power VCC may be provided by an external power circuit or may be provided by the auxiliary power supply 100, for example, the signal provided by the first power VCC may be a 12V voltage signal output by the auxiliary power supply 100 after passing through the voltage conversion circuit 106.

In another embodiment, the driving module 148 may also use a MOS transistor, for example, an NMOS transistor. The threshold voltage of the NMOS can be correspondingly used as the threshold value, so that: when the sampling voltage is smaller than the threshold value, the NMOS tube is cut off; when the sampling voltage is greater than or equal to the threshold value, the NMOS transistor is turned on, and the driving module 148 outputs a second driving voltage, i.e., a low level.

In one embodiment of the present application, with continued reference to fig. 3, the first enabling module 142 includes a fourth voltage divider R4, a fifth voltage divider R5, and a driving device U1. The first end of the fourth voltage divider R4 is connected to the first power VCC, the second end of the fourth voltage divider R4 and the first end of the fifth voltage divider R5 are connected to the first end of the driving device U1, the second end of the fifth voltage divider R5 is connected to the driving module 148, and the second end of the fifth voltage divider R5 is also connected to the second end of the driving device U1. The third terminal of the driving device U1 is connected to the enable terminal COM2 of the external power supply circuit 102, and the fourth terminal of the driving device U1 is grounded. The fourth and fifth voltage divider R4, R5 may be built with more than one resistor and may also be connected in parallel with a capacitor for filtering or delay effects. In this embodiment, the fourth voltage divider R4 and the fifth voltage divider R5 include resistors. And the driving device U1 may employ a photocoupler.

In one embodiment of the present application, with continued reference to fig. 3, the second enabling module 144 includes a third zener diode D3 and a switching tube Q1; the cathode of the third zener diode D3 is connected to the driving module 148, the anode of the third zener diode D3 is connected to the control end of the switching tube Q1, the first conducting end of the switching tube Q1 is connected to the enabling end COM1 of the internal power supply circuit 104, and the second conducting end of the second switching tube Q2 is grounded. The switching tube Q1 may be, for example, a MOS transistor, where a gate, a drain, and a source are respectively used as a control terminal, a first conduction terminal, and a second conduction terminal of the switching tube Q1.

Optionally, the second enabling module 144 further includes a sixth voltage divider R6 and a seventh voltage divider R7, a first end of the sixth voltage divider R6 is connected to the anode of the third zener diode D3, a second end of the sixth voltage divider R6 is connected to the first end of the seventh voltage divider R7 and the control end of the switching tube Q1, and a second end of the seventh voltage divider R7 is grounded. The sixth and seventh voltage divider R6, R7 may be built with more than one resistor.

In one embodiment of the present application, a filter capacitor C2 may be further connected between the control terminal and the first conducting terminal of the switching tube Q1, and the filter capacitor C2 may be utilized to filter or delay the effect, so as to avoid impact on the switching tube Q1.

In one embodiment of the present application, with continued reference to fig. 3, the standby module 149 includes a second zener diode D2, wherein an anode of the second zener diode D2 is connected to the input terminal of the driving module 148 as a first terminal of the standby module 149, and a cathode of the second zener diode D2 is connected to the output terminal sps_sd of the first driving circuit 12 as a second terminal of the standby module 149. After the main control circuit 11 operates in the standby mode, the first terminal sps_sd of the first driving circuit 12 is pulled low. After the sps_sd is pulled down, the voltage is changed to 0V, the conduction voltage drop of the second zener diode D2 is 0.7V, so that the reference voltage of the first zener diode D1 of the driving module 148 is 0.7V, and the low voltage reference voltage of the first zener diode D1 is 2.5V, so that the impedance from the cathode to the anode of the first zener diode D1 becomes infinite, the first zener diode D1 is not conducted, which results in the non-conduction of the driving device U1, and thus, the AC main control chip of the external power supply circuit 102 can automatically restart after the mains supply is connected, and the restarting effect of the mains supply is realized.

Specifically, when the voltage at the input end of the internal power supply circuit 104 is lower than a certain value, the sampling voltage is lower than the threshold value, the controllable precision voltage stabilizing source D1 is not conducted, no voltage difference exists between the first end and the second end of the input end of the photoelectric coupler (i.e., U1), and the light emitting source photoelectric coupler is not conducted. The enable terminal COM2 of the external power supply circuit 102 is in a high impedance state or is set high, and is enabled effectively at this time, the AC main control chip of the external power supply circuit 102 can normally output a switch control signal, and the external power supply circuit 102 normally works. Meanwhile, the first driving voltage is divided by the third zener diode D3, the sixth voltage divider R6 and the seventh voltage divider R7, so that the switching tube Q1 is turned on, and the enabling end COM1 of the internal power supply circuit 104, that is, the enabling pin COM1 of the DC main control chip thereof is pulled down, so that the DC main control chip of the internal power supply circuit 104 stops outputting the switching control signal, and the internal power supply circuit 104 stops working.

When the voltage at the input end of the internal power supply circuit 104 is higher than a certain value, the sampling voltage is higher than a threshold value, the controllable precision voltage stabilizing source D1 is conducted, and the cathode voltage is pulled down, namely a second driving voltage (low level) is output; at this time, the optocoupler is saturated and turned on, and the enable terminal COM2 of the external power supply circuit 102 is pulled down, i.e., the output of the switch control signal is stopped, and the external power supply circuit 102 stops working. And the switching transistor Q1 is turned off because the second driving voltage level becomes low. Therefore, the enable terminal COM1 of the internal power supply circuit 104 is set to a high impedance state or pulled high, i.e. starts outputting the switch control signal, and enters into normal operation. In this way, the auxiliary power supply 100 is switched from the external power supply circuit 102 to the internal power supply circuit 104 to supply power, so that the problem that the auxiliary power supply 100 is powered down in the process of switching the external power supply circuit 102 to the internal power supply circuit 104 to supply power is solved.

The second enabling module 144 of the embodiment of the present application, by setting the third zener diode D3 and the switching tube Q1, immediately pulls down the input of the enabling terminal COM1 of the internal power supply circuit 104 when the external power supply circuit 102 is started, and simultaneously, immediately starts up the input of the enabling terminal COM1 of the internal power supply circuit 104 when the external power supply circuit 102 is disconnected, and the sampling module outputs the same sampling voltage, so that the simultaneous control of the two power supply circuits can be realized, thereby solving the problem that the external power supply circuit 102 and the internal power supply circuit 104 simultaneously input and supply power in the initial stage of starting the auxiliary power supply 100; and when the power supply of the external power supply circuit 102 and the internal power supply circuit 104 is switched, the external power supply circuit 102 and the internal power supply circuit 104 are simultaneously disconnected from power supply, so that the risk of the frying machine is caused. The scheme of the application can improve the stability and reliability of the circuit.

In one embodiment of the present application, the first power VCC may be provided by converting the voltage of the transformer T1 in the auxiliary power supply 100 to form a plurality of voltage outputs. The first power VCC may also be input through a power supply terminal of the main control chip of the internal power supply circuit 104. The first power VCC is input through the power supply end of the main control chip of the internal power supply circuit 104, so that the protection circuit is prevented from being out of control in the case of a short circuit of the output of the voltage conversion circuit 106 of the transformer T1. In addition, the first power VCC is supplied in advance before the output of the voltage conversion circuit 106 is turned on, thereby ensuring that the protection circuit is also effectively protected or activated during the turning on of the auxiliary power supply 100. Therefore, the stability of the protection circuit can be improved by inputting the first power VCC through the power supply terminal of the main control chip of the internal power supply circuit 104.

In one embodiment of the present application, the present application sets an under-voltage point voltage for the input voltage of the input terminal of the internal power supply circuit 104, and the under-voltage point voltage may be a preset voltage value. When the input voltage of the input end of the internal power supply circuit 104 is greater than or equal to the undervoltage point voltage, the sampling voltage output by the sampling module 146 is also greater than or equal to the threshold value, and at this time, the voltage of the input end of the internal power supply circuit 104 reaches the expected value, so that the internal power supply circuit 104 can supply power to the auxiliary power supply 100; accordingly, the driving module 148 outputs the second driving voltage to stop the operation of the external power supply circuit 102 and the operation of the internal power supply circuit 104. When the input voltage at the input end of the internal power supply circuit 104 is smaller than the undervoltage point voltage, the sampling voltage output by the sampling module 146 is also smaller than the threshold, and at this time, the voltage at the input end of the internal power supply circuit 104 does not reach the expected value, so that the internal power supply circuit 104 cannot supply power to the auxiliary power supply 100; accordingly, the driving module 148 outputs the first driving voltage to operate the external power supply circuit 102, and the internal power supply circuit 104 stops operating.

When there is a small oscillation of the input voltage of the input terminal of the internal power supply circuit 104, that is, when the input voltage of the input terminal of the internal power supply circuit 104 fluctuates around the undervoltage point voltage, the driving module 148 repeatedly and alternately outputs the first driving voltage and the second driving voltage, which results in frequent switching of the power supply of the auxiliary power supply 100 between the external power supply circuit 102 and the internal power supply circuit 104, which results in insufficient stability of the auxiliary power supply 100 and affects the operation of the auxiliary power supply 100.

In order to solve the problem of frequent switching between the external power supply circuit 102 and the internal power supply circuit 104 caused by small oscillation of the input voltage. In an alternative embodiment, referring to fig. 4, the second driving circuit 14 further includes a return difference control circuit 143, where the return difference control circuit 143 is connected to the first end of the second voltage divider R2, the driving module 148, and the second enabling module 144. The return difference control circuit 143 has a branch connected in parallel with the second voltage divider R2. The return difference control circuit 143 is configured to switch on a branch connected in parallel to the second voltage divider R2 when the driving module 148 outputs the first driving voltage so that the first enabling module 142 controls the external power supply circuit 102 to operate. The return difference control circuit 143 is further configured to disconnect the branch connected in parallel to the second voltage divider R2 when the driving module 148 outputs the second driving voltage so that the first enabling module 142 controls the external power supply circuit 102 to stop operating.

In one embodiment, referring to fig. 4, the return difference control circuit 143 includes an eighth voltage divider R8 and a switching tube Q2, where a first end of the eighth voltage divider R8 is connected to an output end of the sampling module 146, that is, a first end of the second voltage divider R2, and a first end of the eighth voltage divider R8 is further connected to a control end of the first voltage stabilizing tube D1. The second end of the eighth voltage divider R8 is connected to the first conducting end of the switching tube Q2, the second conducting end of the switching tube Q2 is grounded, and the control end of the switching tube Q2 is connected to the second enabling module 144, and specifically connected to the anode of the third zener diode D3 in the second enabling module 144. That is, the switching tube Q2 and the eighth voltage divider R8 are connected in series to form a branch connected in parallel with the second voltage divider R2. The on-off of the branch circuit can be controlled by controlling the on-off state of the switching tube Q2, so that the eighth voltage divider R8 and the second voltage divider R2 are connected in parallel or disconnected in parallel. The switching tube Q2 can be a MOS tube or a triode. When the switching tube Q2 is a MOS tube, the gate, the drain, and the source of the switching tube Q2 are respectively used as the control end, the first conduction end, and the second conduction end of the switching tube Q2. The eighth voltage divider R8 may be built with more than one resistor and may also be connected in parallel with a capacitor for filtering or delay effects. In this embodiment, the eighth voltage divider R8 includes a resistor.

In one embodiment, with continued reference to FIG. 4, the return difference control circuit 143 further includes a resistor R9, a resistor R10, and a capacitor C3; the resistor R9 is connected in series between the anode of the second voltage stabilizer D1 and the control end of the switching tube Q2, the resistor R10 is connected between the control end of the switching tube Q2 and the ground, and the capacitor C3 is connected in parallel with the resistor R10. Wherein, the resistor R9 plays a role in current limiting, and the resistor R10 and the capacitor C3 play a role in filtering.

The return difference control circuit 143 of the present application is connected in series with the eighth voltage divider R8 through the switching tube Q2 to form a branch connected in parallel with the second voltage divider R2, and when the driving module 148 outputs the first driving voltage to control the first enabling module 142 to control the external power supply circuit 102 to operate, the branch connected in parallel with the second voltage divider R2 is turned on, so that the eighth voltage divider R8 is connected in parallel with the second voltage divider R2 and the third voltage divider R3. Because the equivalent resistance of the eighth voltage divider R8, the second voltage divider R2 and the third voltage divider R3 after being connected in parallel is smaller than the equivalent resistance of the second voltage divider R2 and the third voltage divider R3 after being connected in parallel, and the conduction reference voltage of the controllable precise voltage stabilizing tube D1 is fixed. Therefore, when the external power supply circuit 102 is operated, that is, when the branch connected in parallel with the second voltage divider R2 is turned on, the voltage divided by the equivalent resistance after the parallel connection of the eighth voltage divider R8, the second voltage divider R2, and the third voltage divider R3 is small. Because the first end of the eighth voltage divider R8 is further connected to the control end of the first voltage stabilizing tube D1, the voltage received by the control end of the first voltage stabilizing tube D1 is the same as the voltage divided by the equivalent resistor after the eighth voltage divider R8, the second voltage divider R2 and the third voltage divider R3 are connected in parallel. In the case that the voltage divided by the equivalent resistor after the parallel connection of the eighth voltage divider R8, the second voltage divider R2, and the third voltage divider R3 is smaller, the input voltage of the DC input needs to be larger to make the sampling voltage output by the sampling module 146 control the first voltage stabilizing tube D1 to be turned on. Therefore, when the external power supply circuit 102 works, a larger input voltage is required to turn on the first voltage regulator D1, and the voltage at the undervoltage point is higher.

Conversely, when the driving module 148 outputs the second driving voltage to control the first enabling module 142 to control the external power supply circuit 102 to stop working, the return difference control circuit 143 disconnects the branch connected in parallel with the second voltage divider R2, so that the eighth voltage divider R8 is disconnected in parallel with the second voltage divider R2 and the third voltage divider R3. Because the equivalent resistance of the parallel connection of the second voltage divider R2 and the third voltage divider R3 is larger than that of the eighth voltage divider R8, the second voltage divider R2 and the third voltage divider R3 after being connected in parallel, and the conduction reference voltage of the controllable precise voltage stabilizing tube D1 is fixed. Therefore, the equivalent resistance of the second voltage divider R2 and the third voltage divider R3 connected in parallel divides a larger voltage. Because the first end of the eighth voltage divider R8 is further connected to the control end of the first voltage stabilizing tube D1, the voltage received by the control end of the first voltage stabilizing tube D1 is the same as the voltage divided by the equivalent resistor of the second voltage divider R2 and the third voltage divider R3 connected in parallel. When the voltage divided by the equivalent resistor of the second resistor R2 and the third resistor R3 connected in parallel is large, the sampling voltage output by the sampling module 146 can control the first voltage stabilizing tube D1 to be turned on when the input voltage of the DC input is small. Therefore, when the external power supply circuit 102 does not operate, the first voltage stabilizing tube D1 can be turned on by a smaller input voltage when the internal power supply circuit 104 operates, and the undervoltage point voltage at this time is smaller.

The return difference control circuit 143 of the present application will be further described by way of example.

In one example, with continued reference to fig. 4, when the external power supply circuit 102 is powered on, the internal power supply circuit 104 is not powered on; at this time, the voltage at the input end of the internal power supply circuit 104 is low, so the sampling voltage detected by the sampling module 146 is lower than the threshold value, the controllable precision voltage stabilizing source D1 is not conducted, the cathode of the controllable precision voltage stabilizing source D1 has a high level voltage from the first power source VCC, and the high level voltage will make the switching tube Q2 conducted, so the enable pin COM1 of the internal power supply circuit 104 can be connected to the ground end, and thus the internal power supply circuit 104 stops working. Meanwhile, the high-level voltage from the first power VCC may also control the switch Q2 of the return difference control circuit 143 to be turned on, which corresponds to parallel connection of the voltage dividers R2, R3 and R8, for example, the equivalent resistance after parallel connection is 68.96kΩ; at this time, the voltage of the DC source dc_in is divided by the parallel equivalent resistances of the voltage divider R1 and the voltage dividers R2, R3 and R8, and the voltage divided by the parallel equivalent resistances of the corresponding voltage dividers R8, R2 and R3 is smaller because the parallel equivalent resistances of the voltage dividers R2, R3 and R8 are smaller, so that a larger input voltage is required to turn on the controllable precise voltage-stabilizing source D1, and the under-voltage point voltage is larger, for example, 13.37V. I.e., it indicates that the sampled voltage detected by the sampling module 146 is greater than the threshold when the voltage at the input of the internal power supply circuit 104 is greater than 13.37V.

When the input voltage at the input end of the internal power supply circuit 104 is greater than 13.37V, the controllable precise voltage stabilizing source D1 is turned on, and the controllable precise voltage stabilizing source D1 pulls the first power VCC low, so that the driving device U1 is turned on, and at this time, the cathode of the controllable precise voltage stabilizing source D1 is turned from high level to low level, and the corresponding output of the controllable precise voltage stabilizing source D1 is converted from the first driving voltage to the second driving voltage. Since the second driving voltage is a low level signal and cannot drive the switch tube Q2 to be turned on, the voltage divider R8 is turned off at this time, which is equivalent to parallel connection of the voltage divider R2 and the voltage divider R3, for example, the resistance value of the voltage divider R2 and the voltage divider R3 after parallel connection is 96.77kΩ; at this time, the voltage of the DC input is divided by the parallel equivalent resistors of the voltage divider R1 and the voltage dividers R2 and R3, and since the parallel equivalent resistors of the voltage dividers R2 and R3 are larger, the voltage divided by the parallel equivalent resistors of the corresponding voltage divider R2 and the voltage divider R3 is larger, so that only a smaller input voltage is needed to turn on the controllable precision voltage stabilizing source D1, the undervoltage point voltage at this time is smaller, for example, the undervoltage point voltage at this time is 10.25V. I.e., it indicates that the sampled voltage detected by the sampling module 146 is greater than the threshold when the voltage at the input of the internal power supply circuit 104 is greater than 10.25V.

Therefore, once the input voltage of the input terminal of the internal power supply circuit 104 is higher than the undervoltage point voltage of 13.37V, the internal power supply circuit 104 is switched to supply power to the auxiliary power supply 100, and then the external power supply circuit 102 is switched to operate, and the voltage of the input terminal of the internal power supply circuit 104 must be reduced to 10.25V to switch. The undervoltage return difference magnitude of the return difference control circuit 143 is 13.37-10.25=3.12V. With this return difference design, frequent switching of the internal power supply circuit 104 to the external power supply circuit 102 due to small oscillations of the input voltage at the input of the internal power supply circuit 104 is avoided. The stability of the protection circuit can be effectively improved.

Referring to fig. 1, the embodiment of the application further provides an auxiliary power supply 100, where the auxiliary power supply 100 includes an external power supply 102, an internal power supply 104, a transformer T1, at least one voltage conversion circuit 106, and the control circuit 10 of the auxiliary power supply 100. The external power supply circuit 102, the internal power supply circuit 104 and the voltage conversion circuit 106 are respectively coupled to a transformer T1, and the transformer T1 is configured to receive an electrical energy input of the external power supply circuit 102 or the internal power supply circuit 104 and output an electrical energy through the voltage conversion circuit 106.

When the electronic device enters the standby mode, the first driving circuit 12 of the control circuit 10 of the auxiliary power supply 100 controls the internal power supply circuit 102 to stop working, so that the auxiliary power supply 100 is turned off, and the power consumption can be reduced; meanwhile, the second driving circuit 14 of the control circuit 10 switches the external power supply circuit 104 to a to-be-started state, and controls the external power supply circuit 104 to start when receiving the external power supply signal, so as to realize automatic start of the auxiliary power supply 100 when receiving the external power supply signal.

In addition, after the auxiliary power supply 100 is started, the sampling module 146 of the second driving circuit 14 of the control circuit 10 outputs the same sampling voltage to realize simultaneous control of the external power supply circuit 102 and the internal power supply circuit 104, so that only one of the external power supply circuit 102 and the internal power supply circuit 104 is always in a working state, the problem that the auxiliary power supply 100 cannot work normally and even the auxiliary power supply 100 is started or shut down simultaneously is avoided, and the stability and reliability of the circuits are improved.

Referring to fig. 1 and 5, an electronic device 200 is further provided according to an embodiment of the present application, including the auxiliary power supply 100 and the battery described above. The electronic device 200 may be a portable energy storage power supply, or a switching power supply, or the like. After the auxiliary power supply 100 is provided, the electronic device 200 improves the stability and reliability of the circuit due to the auxiliary power supply 100. The corresponding electronic device does not have problems due to the instability of the auxiliary power supply 100, and thus the stability and reliability of the electronic device can be improved.

Referring to fig. 1, the battery optionally includes a first power outlet (DC input) for supplying power to the internal power supply circuit 104 of the auxiliary power supply 100 and a second power outlet (12V) for supplying power to the main control circuit 11 in the control circuit 10 of the auxiliary power supply 100.

The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.

Claims

1. A control circuit of an auxiliary power supply, the auxiliary power supply being supplied by one of an internal power supply circuit and an external power supply circuit, the control circuit comprising:

A first driving circuit connected to the main control circuit for generating a first driving signal when receiving the first control signal,

2. The control circuit of claim 1, wherein the first driving circuit comprises a first current limiting resistor, a first voltage dividing resistor, a first capacitor and a first switching tube, wherein a control end of the first switching tube is connected to the main control circuit through the first current limiting resistor and is grounded through the first voltage dividing resistor, the first capacitor is connected in parallel with the first voltage dividing resistor, a first conducting end of the first switching tube is connected to the level conversion circuit, and a second conducting end of the first switching tube is grounded.

3. The control circuit of claim 1, wherein the level shift circuit comprises a second capacitor, a third capacitor, a first zener diode, a first pull-up resistor, and a second switch tube, wherein a cathode of the first zener diode, one end of the second capacitor is connected to the first driving circuit, another end of the second capacitor is grounded, an anode of the first zener diode is connected to a control end of the second switch tube, an anode of the first diode is connected to a control end of the second switch tube, a cathode of the first diode is connected to a pull-up power supply, another end of the third capacitor is grounded, the first pull-up resistor is connected between the control end of the second switch tube and the pull-up power supply, a first conducting end of the second switch tube is connected to an enabling end of the internal power supply circuit, and a second conducting end of the second switch tube is grounded.

4. A control circuit as claimed in claim 2 or 3, wherein the second drive circuit is further connected to the internal power supply circuit, the second drive circuit being further operable to output a second drive signal to the internal power supply circuit when the external power supply circuit is in operation to control the internal power supply circuit to cease supplying power to the auxiliary power supply.

5. The control circuit of claim 4, wherein the second drive circuit comprises:

The standby module is used for controlling the driving module to be cut off when receiving the first driving signal so as to enable the first enabling module to be started when receiving an external power supply signal.

6. The control circuit of claim 5 wherein the standby module comprises a second zener diode, an anode of the second zener diode being coupled to the drive module as a first end of the standby module, and a cathode of the second zener diode being coupled to the first drive circuit as a second end of the standby module.

7. The control circuit of claim 5, wherein the sampling module comprises a first voltage divider and a second voltage divider, a first end of the first voltage divider being connected to the input of the internal power supply circuit, a second end being connected to the first end of the second voltage divider, a second end of the second voltage divider being grounded, and a first end of the second voltage divider being connected to the output of the sampling module.

8. An auxiliary power supply comprising an external power supply circuit, an internal power supply circuit, a transformer, at least one voltage conversion circuit and a control circuit for an auxiliary power supply according to any one of claims 1 to 7, wherein the external power supply circuit, the internal power supply circuit and the voltage conversion circuit are respectively coupled to the transformer, and the transformer is configured to receive an electrical power input from the external power supply circuit or the internal power supply circuit and to output an electrical power through the voltage conversion circuit.

9. An electronic device comprising the auxiliary power supply of claim 8.

10. The electronic device of claim 9, further comprising a battery including a first power outlet for powering internal power supply circuitry of the auxiliary power supply and a second power outlet for powering main control circuitry in control circuitry of the auxiliary power supply.