A low standby power consumption power supply circuit and an electronic device

Abstract

The present invention relates to a low standby power supply circuit and an electronic device, comprising: a power input terminal, a delay switch unit, a power conversion unit, a controller module, a first switch unit and a second switch unit; the first switch unit is connected to the power input terminal, the power conversion unit and the delay switch unit, and supplies power to the power conversion unit and the delay switch unit when being triggered to conduct, the delay switch unit conducts when powered on and turns off after a preset duration; the power conversion unit is connected to the delay switch unit and the controller module, and is used to output a supply voltage when the delay switch unit is in a conducting state; the second switch unit is connected to the controller module, and conducts or turns off when the controller module outputs a control signal; the power conversion unit is further connected to the second switch unit to maintain the output when the second switch unit conducts, and stops the output when both the second switch unit and the delay switch unit are in an off state. Implementing the present invention can reduce the standby power consumption of the device and improve the standby power consumption level of the whole machine.

Description

Technical Field

[0001] The present invention relates to the field of electronic technology, and more particularly, to a low standby power consumption power supply circuit and an electronic device. Background Art

[0002] Nowadays, many electronic devices are powered by batteries. Taking a floor washer as an example, its control board is mainly composed of high-power devices, resulting in a relatively large standby operating current, generally above dozens of milliamperes. At the same time, in the industry, floor washers use power-on switches such as key switches and knob switches to cut off the power to reduce power consumption. However, in actual use, it often occurs that users forget to disconnect the switch after using the device or in non-working scenarios, and some misoperations cause the switch to be triggered to turn on, which makes the device enter standby, wasting battery power in vain, and even may drain the battery completely, resulting in permanent damage to the battery.

[0003] In some other scenarios, although a battery power detection function and a long standby detection function are set, when it is detected that the battery power is low or the standby time is too long, the internal MCU turns off various peripheral functions, for example, turns off the LCD screen, disables the communication IC, etc., to enter a further sleep mode to reduce standby power consumption. However, at this time, the circuits of the internal MCU and the peripheral part are not powered off, and they are still in a charged state and consume power. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a low standby power consumption power supply circuit and an electronic device for the above-mentioned partial technical defects of the prior art.

[0005] The technical solution adopted by the present invention to solve its technical problems is to construct a low standby power consumption power supply circuit, including: a power input terminal, a delay switch unit, a power conversion unit, a controller module, a first switch unit, and a second switch unit;

[0006] The first switch unit is connected to the power input terminal, the power conversion unit, and the delay switch unit, and is used to supply power to the power conversion unit and the delay switch unit when being triggered to conduct, wherein the delay switch unit is configured to conduct when powered on and turn off after a preset duration of power-on;

[0007] The power conversion unit is connected to the delay switch unit and the controller module, and is used to output a supply voltage to the controller module to power on the controller module when the delay switch unit is in a conducting state;

[0008] The second switch unit is connected to the controller module, and is used to conduct when the controller module outputs a first control level and turn off when the controller module outputs a second control level;

[0009] The power conversion unit is also connected to the second switch unit, and is configured to maintain the output of the power supply voltage when the second switch unit is in the on state, and stop the output of the power supply voltage when both the second switch unit and the delay switch unit are in the off state.

[0010] Preferably, the delay switch unit includes a voltage stabilizing unit, a delay unit, and a switch driving unit;

[0011] The first end of the voltage stabilizing unit is connected to the first switch unit, the second end of the voltage stabilizing unit is connected to the first end of the delay unit, the third end of the voltage stabilizing unit is grounded, the second end of the delay unit is connected to the first end of the switch driving unit, the second end of the switch driving unit is connected to the first switch unit, and the third end of the switch driving unit is connected to the power conversion unit.

[0012] Preferably, the delay unit includes a reset chip U2; the second end of the voltage stabilizing unit is connected to the third pin of the reset chip U2, the second pin of the reset chip U2 is connected to the first end of the switch driving unit, and the first pin of the reset chip U2 is grounded; and / or

[0013] The voltage stabilizing unit includes a voltage stabilizing diode DZ1 and a first resistor R4. The first end of the first resistor R4 is connected to the first switch unit, the second end of the first resistor R4 is connected to the cathode of the voltage stabilizing diode DZ1 and the first end of the delay unit, and the anode of the voltage stabilizing diode DZ1 is grounded.

[0014] Preferably, the switch driving unit includes a first sub-switch unit and a second sub-switch unit;

[0015] The first end of the first sub-switch unit is connected to the second end of the delay unit, the second end of the first sub-switch unit is connected to the first switch unit, the third end of the first sub-switch unit is connected to the first end of the second sub-switch unit, and the second end of the second sub-switch unit is connected to the power conversion unit.

[0016] Preferably, the first sub-switch unit includes: a first switching transistor Q4, a second resistor R6, a third resistor R3, and a fourth resistor R8;

[0017] The first end of the first switching transistor Q4 is connected to the first end of the second resistor R6, the second end of the second resistor R6 is connected to the second end of the delay unit, the second end of the first switching transistor Q4 is connected to the first end of the third resistor R3, the first end of the fourth resistor R8, and the second sub-switch unit, the second end of the third resistor R3 is connected to the first switch unit, the second end of the fourth resistor R8 is grounded, and the third end of the first switching transistor Q4 is grounded.

[0018] Preferably, the second sub-switching unit includes a second switching transistor Q2. A first end of the second switching transistor Q2 is connected to the first sub-switching unit, a second end of the second switching transistor Q2 is connected to the power conversion unit, and a third end of the second switching transistor Q2 is grounded.

[0019] Preferably, the power conversion unit includes an enable signal generation unit and a power conversion chip U1;

[0020] A first end of the enable signal generation unit is connected to the delay switching unit and the second switching unit. A second end of the enable signal generation unit is connected to an input end of the power conversion chip U1. A third end of the enable signal generation unit is connected to an enable end of the power conversion chip U1. The input end of the power conversion chip U1 is connected to the first switching unit, and an output end of the power conversion chip U1 is connected to the controller module.

[0021] Preferably, the enable signal generation unit includes a third switching transistor Q1, a fifth resistor R1, a sixth resistor R2, a seventh resistor R5, and an eighth resistor R9;

[0022] A first end of the third switching transistor Q1 is respectively connected to a first end of the fifth resistor R1 and a first end of the sixth resistor R2. A second end of the fifth resistor R1 is connected to the first switching unit. A second end of the sixth resistor R2 is connected to the second switching unit and the delay switching unit. A second end of the third switching transistor Q1 is connected to a first end of the seventh resistor R5. A second end of the seventh resistor R5 is respectively connected to the enable end of the power conversion chip U1 and a first end of the eighth resistor R9. A second end of the eighth resistor R9 is grounded, and a third end of the third switching transistor Q1 is connected to the first switching unit.

[0023] Preferably, the second switching unit includes a fourth switching transistor Q3 and a ninth resistor R7;

[0024] A first end of the fourth switching transistor Q3 is connected to a first end of the ninth resistor R7. A second end of the ninth resistor R7 is connected to the controller module. A second end of the fourth switching transistor Q3 is connected to the power conversion unit, and a third end of the fourth switching transistor Q3 is grounded.

[0025] Preferably, the first switching unit includes a manual trigger switch S1;

[0026] A first end of the manual trigger switch S1 is connected to the power input terminal. A second end of the manual trigger switch S1 is connected to the power conversion unit and the delay switching unit.

[0027] Preferably, a low standby power consumption power supply circuit of the present invention further includes a third switch unit;

[0028] A first end of the third switch unit is connected to the power input terminal, a second end of the third switch unit is configured to be connected to a working circuit, and a third end of the third switch unit is connected to the power conversion unit and the controller module. Wherein, the third switch unit is configured to be turned on when the controller module outputs a third control signal and turned off when the controller module outputs a fourth control signal.

[0029] Preferably, the third switch unit includes a relay switch RLY1. A first pin of the relay switch RLY1 is connected to the controller module, a second pin of the relay switch RLY1 is connected to the power conversion unit, a third pin of the relay switch RLY1 is connected to the power input terminal, and a fourth pin of the relay switch RLY1 is configured to be connected to the working circuit.

[0030] In addition, the present invention further constructs an electronic device, including the low standby power consumption power supply circuit described in any one of the above.

[0031] Implementing the low standby power consumption power supply circuit and the electronic device of the present invention has the following beneficial effects: It can reduce the standby power consumption of the device and improve the standby power consumption level of the whole machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0033] Figure 1 is a logic block diagram of an embodiment of a low standby power consumption power supply circuit of the present invention;

[0034] Figure 2 is a circuit schematic diagram of an embodiment of a low standby power consumption power supply circuit of the present invention;

[0035] Figure 3 is a logic block diagram of another embodiment of a low standby power consumption power supply circuit of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] In order to have a clearer understanding of the technical features, objectives, and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the drawings.

[0037] As Figure 1As shown, in the first embodiment of the low standby power supply circuit of the present invention, it includes: a power input terminal 110, a delay switch unit 150, a power conversion unit 130, a controller module 140, a first switch unit 120, and a second switch unit 170; the first switch unit 120 is connected to the power input terminal 110, the power conversion unit 130, and the delay switch unit 150, and is used to supply power to the power conversion unit 130 and the delay switch unit 150 when triggered to conduct, wherein the delay switch unit 150 is configured to conduct when powered on and turn off after a preset duration of power-on; the power conversion unit 130 is connected to the delay switch unit 150 and the controller module 140, and is used to output a supply voltage to the controller module 140 to power on the controller module 140 when the delay switch unit 150 is in a conducting state; the second switch unit 170 is connected to the controller module 140, and is used to conduct when the controller module 140 outputs a first control level and turn off when the controller module 140 outputs a second control level; the power conversion unit 130 is also connected to the second switch unit 170, and is used to maintain the output supply voltage when the second switch unit 170 is in a conducting state, and stop outputting the supply voltage when both the second switch unit 170 and the delay switch unit 150 are in a turned-off state. Specifically, the power input terminal 110 is used to connect to a power source, and this power source can be a battery pack. Connecting the power input terminal 110 can connect to the first end of the first switch unit 120. After the first switch unit 120 is started, the power is output through the power input terminal 110 and the first switch unit 120 to supply power to the power conversion unit 130 and the delay switch unit 150. Among them, the power conversion unit 130 and the delay switch unit 150 can be connected to the second end of the first switch unit 120. The delay switch unit 150 is initially turned on when powered on and turns off after a certain period of time, that is, the preset duration. When the delay switch unit 150 is conducting, the power conversion unit 130 starts to convert its input voltage to obtain an output voltage, and supplies power to the subsequent controller module 140 through this output voltage, and the controller module 140 is powered on and starts to work. When the controller module 140 is powered on and working, it can output a first control level to trigger the second switch unit 170 to conduct, and output a second control level to trigger the second switch unit 170 to turn off. When the controller module 140 outputs a first control level to control the second switch unit 170 to conduct, the power conversion unit 130 maintains its working state by the conducting second switch unit 170. At this time, even if the delay switch unit 150 turns off after a delay, the voltage output can still be maintained, that is, the voltage output is maintained to ensure the operation of the controller module 140, so as to finally maintain the normal operation of the power supply circuit. It can be understood that when the delay switch unit 150 enters the turned-off state after a delay, the working state of the power conversion unit 130 will be completely controlled by the controller module 140.For example, when the power supply circuit is to be set to the standby state, the second control level can be output by the controller module 140 at this time to turn off the second switch unit 170, and finally turn off the output of the power conversion unit 130, so that the power supply circuit enters the standby state. At this time, to resume power supply from the standby state, it is necessary to re-trigger the first switch unit 120 to power on and conduct the delay switch unit 150 again to make the controller module 140 enter the working state. In one embodiment, the delay duration is generally several hundred milliseconds, and a reasonable delay duration can be obtained by adjusting the delay switch unit 150. The controller module 140 can be composed of a general MCU chip.

[0038] As Figure 2 shown, in one embodiment, the delay switch unit 150 includes a voltage stabilizing unit 151, a delay unit 152, and a switch driving unit 153; the first end of the voltage stabilizing unit 151 is connected to the first switch unit 120, the second end of the voltage stabilizing unit 151 is connected to the first end of the delay unit 152, the third end of the voltage stabilizing unit 151 is grounded, the second end of the delay unit 152 is connected to the first end of the switch driving unit 153, the second end of the switch driving unit 153 is connected to the first switch unit 120, and the third end of the switch driving unit 153 is connected to the power conversion unit 130. Specifically, the delay unit 152 is used to delay the output of the corresponding level signal, which can specifically be the first level output at the initial power-on and the second level output after a period of delay. Among them, the switch driving unit 153 conducts when receiving the first level output by the delay unit 152 and turns off when receiving the second level output by the delay unit 152. The delay switch unit 150 conducts and turns off according to the on and off states of the switch driving unit 153. The voltage stabilizing unit 151 is used to provide a stable power supply voltage for the delay unit 152.

[0039] Optionally, the delay unit 152 includes a reset chip U2; the second terminal of the voltage stabilization unit 151 is connected to the third pin of the reset chip U2, the second pin of the reset chip U2 is connected to the first terminal of the switch driving unit 153, and the first pin of the reset chip U2 is grounded. Specifically, the delay unit 152 can adopt the reset chip U2. Among them, the power supply pin of the reset chip U2, that is, the third pin, provides a stable power supply voltage through the voltage stabilization unit 151. The voltage stabilization unit 151 is connected to the first switch unit 120 to stabilize the output voltage of the first switch unit 120 to obtain the working voltage required by the reset chip U2. It can also be understood that the output voltage is stabilized by the voltage stabilization unit 151 so that it is maintained within the working voltage range of the reset chip U2. The output pin of the reset chip U2, that is, the second pin, is connected to the switch driving unit 153, and the switch driving unit 153 turns off or conducts correspondingly according to the output of the reset chip U2. The first pin of the reset chip U2, that is, the grounding pin, is used to ground. In an embodiment, when the reset chip U2 outputs an initial level during the initial power-on stage, the switch driving unit 153 is turned on after receiving the initial level. At this time, the delay switch unit 150 is correspondingly in the on state. After the reset chip U2 outputs a delay level after a delay period, the switch driving unit 153 is turned off after receiving the delay level. At this time, the delay switch unit 150 is correspondingly in the off state. Therefore, it can also be understood that the power conversion unit 130 operates according to the state of the delay switch unit 150, that is, the power conversion unit 130 performs corresponding actions according to the on or off of the switch driving unit 153. The reset chip U2 can adopt a chip that outputs a low-level reset signal, and at the same time, a low-power reset IC is selected, such as MAX809. In another embodiment, the delay unit 152 can also generate a delay level by other means such as a D flip-flop.

[0040] Optionally, the voltage regulation unit 151 includes a voltage regulating diode DZ1 and a first resistor R4. The first end of the first resistor R4 is connected to the first switch unit 120, the second end of the first resistor R4 is connected to the cathode of the voltage regulating diode DZ1 and the first end of the delay unit 152, and the anode of the voltage regulating diode DZ1 is grounded. Specifically, the delay unit 152 can be powered by connecting the first resistor R4 and the voltage regulating diode DZ1 in series. The output voltage of the first switch unit 120 generates the operating voltage of the delay unit 152 at the series node of the serially connected first resistor R4 and voltage regulating diode DZ1. It can be understood that when the power supply circuit enters the standby state, the standby power consumption of the delay switch unit 150 affects the standby power consumption of the entire power supply circuit. Among them, in the delay switch unit 150, the regulating current of its first resistor R4 and voltage regulating diode DZ1 is the key to affecting the standby power consumption. Therefore, when selecting the first resistor R4, a resistor with a large resistance value needs to be selected, and at the same time, a voltage regulating diode with a small Izt current needs to be selected. In one embodiment, MMSSZ468T1G can be selected. In another embodiment, the voltage regulation unit 151 can also be implemented by means of an LDO, a DC / DC, or other power chips, etc.

[0041] Optionally, the switch driving unit 153 includes a first sub-switch unit and a second sub-switch unit; the first end of the first sub-switch unit is connected to the second end of the delay unit 152, the second end of the first sub-switch unit is connected to the first switch unit 120, the third end of the first sub-switch unit is connected to the first end of the second sub-switch unit, and the second end of the second sub-switch unit is connected to the power conversion unit. Specifically, the switch driving unit 153 is composed of two switching circuits. Among them, the first sub-switch unit is connected to the delay unit 152, and it operates to conduct or turn off according to the output level of the delay unit 152 to output a corresponding driving level. The second sub-switch unit is connected to the first sub-switch unit and is used to conduct or turn off according to the driving level output by the first sub-switch unit to finally control the operation of the power conversion unit 130.

[0042] Optionally, the first sub-switching unit includes: a first switching transistor Q4, a second resistor R6, a third resistor R3, and a fourth resistor R8; a first end of the first switching transistor Q4 is connected to a first end of the second resistor R6, a second end of the second resistor R6 is connected to a second end of the delay unit 152, a second end of the first switching transistor Q4 is connected to a first end of the third resistor R3, a first end of the fourth resistor R8, and the second sub-switching unit, a second end of the third resistor R3 is connected to the first switching unit 120, a second end of the fourth resistor R8 is grounded, and a third end of the first switching transistor Q4 is grounded. Specifically, in the first sub-switching unit, when the reset chip U2 outputs an initial level, the first switching transistor Q4 is in an off state. At this time, the output voltage of the first switching unit 120 is divided by the series-connected third resistor R3 and fourth resistor R8 to generate a voltage at their series connection node to drive the second sub-switching unit to conduct. After a delay period, when the reset chip U2 outputs a delayed level, the first switching transistor Q4 is in a conducting state. At this time, the third resistor R3 is directly grounded, and the voltage at the series connection node of the third resistor R3 and the fourth resistor R8 is almost zero. This low level drives the second sub-switching unit to turn off. The current flowing through the third resistor R3 is also the key to affecting the standby power consumption. This resistor can be selected as a high-value resistor to reduce the flowing current. In an embodiment, the first switching transistor Q4 can be a MOS transistor. The gate of this MOS transistor is connected to the second pin of the reset chip U2 through the second resistor R6, and it turns off when the second pin of the reset chip U2 outputs a low level, i.e., the initial level, and turns on when the second pin of the reset chip U2 outputs a high level, i.e., the delayed level.

[0043] Optionally, the second sub-switching unit includes a second switching transistor Q2. A first end of the second switching transistor Q2 is connected to the first sub-switching unit, a second end of the second switching transistor Q2 is connected to the power conversion unit 130, and a third end of the second switching transistor Q2 is grounded. Specifically, the process of the first sub-switching unit outputting to drive the second sub-switching unit to act can be that the level output by the first sub-switching unit drives the second switching transistor Q2 to conduct or turn off. In an embodiment, the second switching transistor Q2 can be a MOS transistor. The gate of this MOS transistor is connected to the first sub-switching unit, and it conducts when the first sub-switching unit outputs a high level and turns off when the first sub-switching unit outputs a low level.

[0044] Optionally, the power conversion unit 130 includes an enable signal generation unit and a power conversion chip U1; a first end of the enable signal generation unit is connected to the delay switch unit 150 and the second switch unit 170, a second end of the enable signal generation unit is connected to an input end of the power conversion chip U1, a third end of the enable signal generation unit is connected to an enable end of the power conversion chip U1, an input end of the power conversion chip U1 is connected to the first switch unit 120, and an output end of the power conversion chip U1 is connected to the controller module 140. Specifically, in the power conversion unit 130, the delay switch unit 150 and the second switch unit 170 are used to drive the enable signal generation unit to act and generate an enable level to drive the power conversion chip U1 to work. Among them, the enable signal generation unit outputs an enable signal to make the power conversion chip U1 output a voltage when the delay switch unit 150 or the second switch unit 170 is turned on, and it will only drive the enable signal generation unit to act and turn off the enable level to make the power conversion chip U1 turn off its power output when the delay switch unit 150 and the second switch unit 170 are both turned off. The power conversion chip U1 is also the key to affecting the standby power consumption. Therefore, a low-power DC / DC chip can be selected, for example, MP2565DN can be selected.

[0045] Optionally, the enable signal generation unit includes a third switch transistor Q1, a fifth resistor R1, a sixth resistor R2, a seventh resistor R5, and an eighth resistor R9; a first end of the third switch transistor Q1 is respectively connected to a first end of the fifth resistor R1 and a first end of the sixth resistor R2, a second end of the fifth resistor R1 is connected to the first switch unit 120, a second end of the sixth resistor R2 is connected to the delay switch unit 150 and the second switch unit 170, a second end of the third switch transistor Q1 is connected to a first end of the seventh resistor R5, a second end of the seventh resistor R5 is respectively connected to the enable end of the power conversion chip U1 and a first end of the eighth resistor R9, a second end of the eighth resistor R9 is grounded, and a third end of the third switch transistor Q1 is connected to the first switch unit 120. Specifically, when the delay switch unit 150 or the second switch unit 170 is turned on, in the enable signal generation unit, the fifth resistor R1 and the sixth resistor R2 form a series connection loop, and the output voltage of the first switch unit 120 generates a voltage division at the series node of the fifth resistor R1 and the sixth resistor R2. The third switch transistor Q1 is driven to conduct through this voltage division. The output voltage of the first switch unit 120 simultaneously generates a voltage division at the series node of the serially connected seventh resistor R5 and eighth resistor R9 through the conducting third switch transistor Q1, and the power conversion chip U1 is driven to act through this voltage division. In an embodiment, the third switch transistor Q1 can be a MOS transistor. The gate of this MOS transistor is connected to the series node of the fifth resistor R1 and the sixth resistor R2. At the same time, the source of this MOS transistor is connected to the first switch unit 120, and the drain of the MOS transistor is connected to the enable end of the power conversion chip U1 through the seventh resistor R5.

[0046] Optionally, the second switch unit 170 includes a fourth switching transistor Q3 and a ninth resistor R7; a first end of the fourth switching transistor Q3 is connected to a first end of the ninth resistor R7, a second end of the ninth resistor R7 is connected to the controller module 140, a second end of the fourth switching transistor Q3 is connected to the power conversion unit 130, and a third end of the fourth switching transistor Q3 is grounded; specifically, in the second switch unit 170, the first end of the fourth switching transistor Q3 is connected to the controller module 140 through the ninth resistor R7, and the fourth switching transistor Q3 is controlled to be turned on or off by a first control level or a second control level output by the controller module 140. In one embodiment, the fourth switching transistor Q3 may be a MOS transistor, and a gate of the MOS transistor is connected to the controller module 140. In one embodiment, the fourth switching transistor Q3 may be a MOS transistor, a gate of the MOS transistor is connected to the controller module 140 through the ninth resistor R7, and is turned on when the controller module 140 outputs a high level, i.e., the first control level, and is turned off when the controller module 140 outputs a low level, i.e., the second control level.

[0047] Optionally, the first switch unit 120 includes a manual trigger switch S1; a first end of the manual trigger switch S1 is connected to the power input terminal 110, and a second end of the manual trigger switch S1 is connected to the power conversion unit 130 and the delay switch unit 150. Specifically, the first switch unit 120 employs a manual trigger switch S1 such as a key switch or a knob switch, and is powered on by manual triggering to power on the power supply circuit.

[0048] As Figure 2 and Figure 3 As shown, in one embodiment, the low standby power consumption power supply circuit of the present invention further includes a third switch unit 180; a first end of the third switch unit 180 is connected to the power input terminal 110, a second end of the third switch unit 180 is used to connect a working circuit 200, and a third end of the third switch unit 180 is connected to the power conversion unit 130 and the controller module 140, wherein the third switch unit 180 is turned on when the controller module 140 outputs a third control level and is turned off when the controller module 140 outputs a fourth control level. Specifically, the third switch unit 180 is connected to the working circuit 200 of the device, and the third switch unit 180 is controlled to be turned on or off by the controller module 140. When the third switch unit 180 is turned on, the power input at its power input terminal 110 can supply power to the subsequent working circuit 200 through the turned-on third switch unit 180. When the third switch unit 180 is turned off, the power supply from the power input terminal 110 to the subsequent working circuit 200 can be cut off, so as to realize the power supply control of the working circuit 200 by the controller module 140.

[0049] Optionally, the third switch unit 180 includes a relay switch RLY1. The first pin of the relay switch RLY1 is connected to the controller module 140, the second pin of the relay switch RLY1 is connected to the power conversion unit 130, the third pin of the relay switch RLY1 is connected to the power input terminal 110, and the fourth pin of the relay switch RLY1 is used to connect to the working circuit 200. Specifically, the third switch unit 180 may adopt the relay switch RLY1. The coil of the relay switch RLY1 can be controlled to be powered on or off by the controller module 140, so as to finally control the contacts of the relay switch RLY1 to be disconnected or closed.

[0050] In addition, an electronic device according to the present invention includes any of the above low standby power consumption power supply circuits, and through this power supply circuit, the standby power consumption of the entire electronic device is reduced.

[0051] It can be understood that the above embodiments only represent the preferred embodiments of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can also be made, which all belong to the protection scope of the present invention. Therefore, all equivalent transformations and modifications made to the scope of the claims of the present invention shall fall within the scope covered by the claims of the present invention.

Claims

1. A low standby power consumption power supply circuit, characterized in that Including: A power input terminal, a delay switch unit, a power conversion unit, a controller module, a first switch unit, and a second switch unit; The first switch unit is connected to the power input terminal, the power conversion unit, and the delay switch unit, and is configured to supply power to the power conversion unit and the delay switch unit when triggered to conduct. Wherein, the delay switch unit is configured to conduct when powered on and turn off after a preset duration of power-on; The power conversion unit is connected to the delay switch unit and the controller module, and is configured to output a supply voltage to the controller module to power on the controller module when the delay switch unit is in a conducting state; The second switch unit is connected to the controller module and is configured to conduct when the controller module outputs a first control level and turn off when the controller module outputs a second control level; The power conversion unit is further connected to the second switch unit, and is configured to maintain the output of the supply voltage when the second switch unit is in a conducting state, and stop outputting the supply voltage when both the second switch unit and the delay switch unit are in a turned-off state; Wherein, the controller module outputs the first control level when powered on and outputs the second control level when it needs to enter the standby state.

2. The low standby power consumption power supply circuit according to claim 1, wherein The delay switch unit includes a voltage stabilization unit, a delay unit, and a switch driving unit; The first end of the voltage stabilization unit is connected to the first switch unit, the second end of the voltage stabilization unit is connected to the first end of the delay unit, the third end of the voltage stabilization unit is grounded, the second end of the delay unit is connected to the first end of the switch driving unit, the second end of the switch driving unit is connected to the first switch unit, and the third end of the switch driving unit is connected to the power conversion unit.

3. The low standby power consumption power supply circuit according to claim 2, wherein The delay unit includes a reset chip U2; the second end of the voltage stabilization unit is connected to the third pin of the reset chip U2, the second pin of the reset chip U2 is connected to the first end of the switch driving unit, and the first pin of the reset chip U2 is grounded; and / or The voltage stabilization unit includes a voltage stabilizing diode DZ1 and a first resistor R4. The first end of the first resistor R4 is connected to the first switch unit, the second end of the first resistor R4 is connected to the cathode of the voltage stabilizing diode DZ1 and the first end of the delay unit, and the anode of the voltage stabilizing diode DZ1 is grounded.

4. The low standby power consumption power supply circuit according to claim 2, wherein The switch driving unit includes a first sub-switch unit and a second sub-switch unit; The first end of the first sub-switch unit is connected to the second end of the delay unit, the second end of the first sub-switch unit is connected to the first switch unit, the third end of the first sub-switch unit is connected to the first end of the second sub-switch unit, and the second end of the second sub-switch unit is connected to the power conversion unit.

5. The low standby power consumption power supply circuit according to claim 4, characterized in that, The first sub-switch unit includes: a first switch transistor Q4, a second resistor R6, a third resistor R3, and a fourth resistor R8; The first end of the first switching transistor Q4 is connected to the first end of the second resistor R6, the second end of the second resistor R6 is connected to the second end of the delay unit, the second end of the first switching transistor Q4 is connected to the first end of the third resistor R3, the first end of the fourth resistor R8, and the second sub-switching unit, the second end of the third resistor R3 is connected to the first switching unit, the second end of the fourth resistor R8 is grounded, and the third end of the first switching transistor Q4 is grounded.

6. The low standby power consumption power supply circuit according to claim 4, characterized in that The second sub-switching unit includes a second switching transistor Q2. The first end of the second switching transistor Q2 is connected to the first sub-switching unit, the second end of the second switching transistor Q2 is connected to the power conversion unit, and the third end of the second switching transistor Q2 is grounded.

7. The low standby power consumption power supply circuit according to claim 1, characterized in that, The power conversion unit includes an enable signal generation unit and a power conversion chip U1; The first end of the enable signal generation unit is connected to the delay switching unit and the second switching unit, the second end of the enable signal generation unit is connected to the input end of the power conversion chip U1, the third end of the enable signal generation unit is connected to the enable end of the power conversion chip U1, the input end of the power conversion chip U1 is connected to the first switching unit, and the output end of the power conversion chip U1 is connected to the controller module.

8. The low standby power consumption power supply circuit according to claim 7, wherein The enable signal generation unit includes a third switching transistor Q1, a fifth resistor R1, a sixth resistor R2, a seventh resistor R5, and an eighth resistor R9; The first end of the third switching transistor Q1 is respectively connected to the first end of the fifth resistor R1 and the first end of the sixth resistor R2. The second end of the fifth resistor R1 is connected to the first switching unit. The second end of the sixth resistor R2 is connected to the second switching unit and the delay switching unit. The second end of the third switching transistor Q1 is connected to the first end of the seventh resistor R5. The second end of the seventh resistor R5 is respectively connected to the enable end of the power conversion chip U1 and the first end of the eighth resistor R9. The second end of the eighth resistor R9 is grounded. The third end of the third switching transistor Q1 is connected to the first switching unit.

9. The low standby power consumption power supply circuit according to claim 1, wherein, The second switching unit includes a fourth switching transistor Q3 and a ninth resistor R7; The first end of the fourth switching transistor Q3 is connected to the first end of the ninth resistor R7. The second end of the ninth resistor R7 is connected to the controller module. The second end of the fourth switching transistor Q3 is connected to the power conversion unit. The third end of the fourth switching transistor Q3 is grounded.

10. The low standby power consumption power supply circuit according to claim 1, characterized in that, The first switching unit includes a manual trigger switch S1; The first end of the manual trigger switch S1 is connected to the power input terminal. The second end of the manual trigger switch S1 is connected to the power conversion unit and the delay switching unit.

11. The low standby power consumption power supply circuit according to claim 1, wherein It further includes a third switching unit; The first end of the third switching unit is connected to the power input terminal, the second end of the third switching unit is for connecting a working circuit, and the third end of the third switching unit is connected to the power conversion unit and the controller module. Wherein, the third switching unit is used to conduct when the controller module outputs a third control signal level and turn off when the controller module outputs a fourth control signal level.

12. The low standby power consumption power supply circuit according to claim 11, characterized in that, The third switching unit includes a relay switch RLY1. The first pin of the relay switch RLY1 is connected to the controller module, the second pin of the relay switch RLY1 is connected to the power conversion unit, the third pin of the relay switch RLY1 is connected to the power input terminal, and the fourth pin of the relay switch RLY1 is for connecting the working circuit.

13. An electronic device, characterized in that, A low standby power consumption power supply circuit as claimed in any one of claims 1 to 12 is included.

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