Control circuit, control method, electrical equipment and electrical equipment control method

Abstract

The invention discloses a control circuit, a control method, electrical equipment and an electrical equipment control method. The control circuit comprises a switching power supply unit 10, a switching unit 30, a control unit 40 and a power supply end V1, wherein the switching power supply unit 10 comprises a switching power supply chip IC1; the power supply end of the control unit 40 is electrically connected with the power supply end V1; the first end of the switching unit 30 is electrically connected with the power supply end V1, the second end of the switching unit 30 is grounded, the third end of the switching unit 30 is electrically connected with the power supply end of the switching power supply chip IC1, and the fourth end of the switching unit 30 is electrically connected with the signal output end of the control unit 40. The control circuit can reduce the power loss of the switching power supply unit when the load is standby.

Description

[0001] This application claims the priority of a Chinese patent application with the application number 2023116055836, titled "A Control Circuit, Control Method, Electrical Equipment, and Electrical Equipment Control Method", which was filed on November 28, 2023. The entire content thereof is incorporated herein by reference. Technical Field

[0002] The present invention relates to the field of power electronics technology, and more particularly, to a control circuit, a control method, an electrical equipment, and an electrical equipment control method. Background Art

[0003] Since the control unit in the electrical equipment (such as the main chip of the drive board of a window air conditioner) needs to be powered by a switching power supply unit to work, the control unit cannot shut down the switching power supply unit. This makes it so that even when the electrical equipment is in the standby state, without cutting off the overall power supply of the electrical equipment (such as unplugging the power plug of the electrical equipment), the switching power supply unit will always be in the working state, resulting in relatively large power losses. Summary of the Invention

[0004] In view of this, the present invention provides a control circuit, a control method, an electrical equipment, and an electrical equipment control method to reduce the power loss of the switching power supply unit when the load is in standby.

[0005] A control method, which can be applied to electrical equipment, the control method includes the following steps:

[0006] If the load of the electrical equipment is in the standby state, the control unit sends at least a first signal to the switching unit;

[0007] According to the first signal, the switching unit disconnects the power supply terminal of the switching power supply chip in the switching power supply from the power supply end, and grounds the power supply terminal of the switching power supply chip, so that the switching power supply chip is powered off.

[0008] In the control method of this embodiment, if the load of the electrical equipment is in the standby state, the control unit sends at least a first signal to the switching unit, and the switching unit disconnects the power supply terminal of the switching power supply chip from the power supply end according to the first signal, and grounds the power supply terminal of the switching power supply chip, so that the switching power supply chip is powered off, thereby reducing the power loss of the switching power supply unit when the load is in standby.

[0009] A control circuit, applicable to electrical equipment; includes: a switching power supply unit, a switching unit, a control unit, and a power supply end;

[0010] Among them, the switching power supply unit includes a switching power supply chip;

[0011] The first end of the switching unit is electrically connected to the power supply terminal, the second end of the switching unit is grounded, the third end of the switching unit is electrically connected to the power supply terminal of the switching power supply chip, and the fourth end of the switching unit is electrically connected to the signal output terminal of the control unit;

[0012] When the load is in the standby state, the control unit can send at least a first signal to the switching unit;

[0013] The switching unit has at least a first operating state. In the first operating state, when the switching unit receives the first signal, the second end of the switching unit is electrically connected to the third end of the switching unit.

[0014] The control circuit of this embodiment includes a switching power supply unit, a switching unit, a control unit, and a power supply terminal. When the load is in the standby state, the control unit can send a first signal to the switching unit, and the switching unit can enter the first operating state, that is, the second end of the switching unit is electrically connected to the third end of the switching unit, so that the power supply terminal of the switching power supply chip is grounded, the power supply terminal of the switching power supply chip is disconnected from the power supply terminal, and the switching power supply chip is powered off, thereby reducing the power loss of the switching power supply unit when the load is in standby.

[0015] An electrical device includes any one of the control circuits disclosed above and a load. The control circuit includes: a switching power supply unit, a switching unit, a control unit, and a power supply terminal; wherein, the switching power supply unit includes a switching power supply chip;

[0016] The power supply terminal of the control unit is electrically connected to the power supply terminal;

[0017] The first end of the switching unit is electrically connected to the power supply terminal, and the second end of the switching unit is grounded; the third end of the switching unit is electrically connected to the power supply terminal of the switching power supply chip, and the fourth end of the switching unit is electrically connected to the signal output terminal of the control unit; the signal detection terminal of the control unit is electrically connected to the load;

[0018] When the load is in the standby state, the control unit can send at least a first signal to the switching unit;

[0019] The switching unit has at least a first operating state. In the first operating state, when the switching unit receives the first signal, the second end of the switching unit is electrically connected to the third end of the switching unit.

[0020] The electrical device of this embodiment has the control circuit in any of the above embodiments. The control circuit includes a switching power supply unit, a switching unit, a control unit, and a power supply terminal. When the load is in the standby state, the control unit can send a first signal to the switching unit, and the switching unit can enter the first working state, that is, the second terminal of the switching unit is electrically connected to the third terminal of the switching unit, so that the power supply terminal of the switching power supply chip is grounded, and the power supply terminal of the switching power supply chip is disconnected from the power supply terminal, and the switching power supply chip is powered off, thereby reducing the power loss of the switching power supply unit when the load is in standby.

[0021] A method for controlling an electrical device includes the following steps:

[0022] If the load of the electrical device is in the standby state, the control unit sends at least a first signal to the switching unit;

[0023] According to the first signal, the switching unit disconnects the power supply terminal of the switching power supply chip of the switching power supply from the power supply terminal, grounds the power supply terminal of the switching power supply chip, and powers off the switching power supply chip.

[0024] The above-disclosed method for controlling an electrical device is applied to an electrical device having a control circuit. If the load of the electrical device is in the standby state, the control unit sends at least a first signal to the switching unit, and the switching unit disconnects the power supply terminal of the switching power supply chip from the power supply terminal according to the first signal, grounds the power supply terminal of the switching power supply chip, and powers off the switching power supply chip, thereby reducing the power loss of the switching power supply unit when the load is in standby. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a schematic structural diagram of a control circuit of an electrical device disclosed in an embodiment of the present invention;

[0027] Figure 2 It is a schematic structural diagram of another control circuit of an electrical device disclosed in an embodiment of the present invention;

[0028] Figure 3 For Figure 2 It is a schematic diagram of the principle of the control circuit of the electrical device shown;

[0029] Figure 4 It is a flowchart of a control method disclosed in an embodiment of the present invention;

[0030] Figure 5 Flow chart of an electrical equipment control method disclosed in an embodiment of the present invention. Detailed implementation manners

[0031] For the sake of citation and clarity, the technical terms, abbreviations or acronyms used hereinafter are summarized as follows:

[0032] MOSFET: Metal-Oxide-Semiconductor Field-Effect Transistor, metal oxide semiconductor field effect transistor;

[0033] NMOS: N-type MOS transistor;

[0034] PMOS: P-type MOS transistor.

[0035] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0036] See Figure 1 , an embodiment of the present invention discloses a control circuit, including: a switching power supply unit 10, a switching unit 30, a control unit 40, and a power supply terminal V1;

[0037] Among them, the switching power supply unit 10 includes a switching power supply chip IC1;

[0038] The power supply terminal V1 is connected to the power supply terminal of the control unit 40;

[0039] The first end, the second end, the third end, and the fourth end of the switching unit 30 are connected to the power supply terminal V1, the ground, the power supply terminal of the switching power supply chip IC1, and the signal output terminal of the control unit 40 one by one (for the convenience of description, the signal output terminal will be named as pin 1 hereinafter, as Figure 1 shown); the power supply terminal V1 can be the output terminal of the switching power supply unit 10, that is, the low-voltage power supply of the control circuit comes from the switching power supply unit 10. When the load is in the standby state, the control unit 40 can at least send a first signal to the switching unit 30; the switching unit 30 has at least a first working state. In the first working state, when the switching unit 30 obtains the first signal, the second end of the switching unit 30 is electrically connected to the third end of the switching unit 30.

[0040] The circuit structure of the embodiment of the present invention determines that when the second end and the third end of the switching unit 30 are connected, the switching power supply unit 10 will stop working. Then, in order to reduce the power loss of the switching power supply unit 10 during load standby, the control unit 40 needs to change the output signal of pin 1 during load standby, so that the second end and the third end of the switching unit 30 are connected and the switching power supply unit 10 stops working during load standby.

[0041] Further, in another embodiment, when the load is in the standby state, the control unit 40 can also send a second signal to the switching unit 30; the switching unit 30 further has a second working state. In the second working state, when the switching unit 30 receives the second signal, the first end of the switching unit 30 is electrically connected to the third end of the switching unit 30; the switching power supply chip IC1 is electrically connected to the DC bus of the switching power supply unit 10. The circuit structure of the embodiment of the present invention determines that when the first end and the third end of the switching unit 30 are connected and the switching power supply chip IC1 is electrically connected to the DC bus, the switching power supply unit 10 can obtain power supply again, so that the switching power supply unit 10 can start working again.

[0042] For the convenience of description, in the embodiment of the present invention, the default output signal of pin 1 is denoted as the second signal, and the signal output by pin 1 when the electrical device enters the standby state is denoted as the first signal. Usually, the second signal is a low level or a high impedance state, and the first signal is a high level.

[0043] Taking the power supply terminal V1 as the output terminal of the switching power supply unit 10, the second signal being a low level or a high impedance state, and the first signal being a high level as an example, the working principle of the embodiment of the present invention will be described in detail below:

[0044] The switching power supply unit 10 is a power supply that uses modern power electronics technology to maintain a stable output voltage by controlling the time ratio of the switching tube to turn on and off. The switching power supply chip IC1 is an integrated circuit (the switching tube and the switching tube control program are integrated inside the switching power supply chip IC1), which receives electrical energy from the input power supply, that is, the bus of the switching power supply unit 10 (such as the DC bus), and is used to implement the control and regulation functions of the switching power supply unit 10.

[0045] Before the switching power supply unit 10 starts working, the control unit 40 is not powered. At this time, pin 1 of the control unit 40 is at a low level or in a high-impedance state (the high-impedance state is caused by the uncertain power potential at the initial power-on. After normal startup, the high-impedance state no longer exists). The switching power supply chip IC1 receives electrical energy from the bus of the switching power supply unit 10, enabling the switching power supply unit 10 to start working and generate a stable output voltage V1 to power the control unit 40 and make the control unit 40 operate normally. At the same time, since the switching unit 30 connects the power supply terminal VCC of the switching power supply chip IC1 to the output terminal of the switching power supply unit 10 when pin 1 is at a low level or in a high-impedance state, the switching power supply chip IC1 can maintain stable operation.

[0046] During the normal operation of the control unit 40, if the control unit 40 detects that the load of the electrical device is turned on (still taking the control unit 40 as the main chip IC3 of the drive board of the window air conditioner as an example, the control unit 40 detecting that the load of the electrical device is turned on can be that the main chip detects the presence of turn-on signals for loads such as the fan and compressor of the window air conditioner), it will make pin 1 remain at a low level. At this time, the output voltage V1 of the switching power supply unit 10 continues to power the control unit 40 on the one hand, and on the other hand, continues to power the switching power supply chip IC1 together with the electrical energy from the bus of the switching power supply unit 10.

[0047] During the normal operation of the control unit 40, if the control unit 40 detects that the load enters the standby state (still taking the control unit 40 as the main chip IC3 of the drive board of the window air conditioner as an example, the control unit 40 detecting that the load enters the standby state can be that the main chip detects that there are no turn-on signals for loads such as the fan and compressor of the window air conditioner), it will set pin 1 to a high level. At this time, the switching unit 30 cuts off the electrical connection between the output terminal of the switching power supply unit 10 and the power supply terminal VCC of the switching power supply chip IC1, and pulls down the voltage of the power supply terminal VCC of the switching power supply chip IC1 to ground, causing the switching power supply chip IC1 to be in an undervoltage state and stop working. The control unit 40 is powered by continuously consuming the energy stored in the capacitor components inside the switching power supply unit 10 until the control unit 40 stops working when the stored energy is insufficient. The switching power supply unit 10 receives power from the bus (such as a DC bus) of the switching power supply unit 10, so that the switching power supply chip IC1 resumes working, pin 1 resumes to a low level, and the control circuit runs in the next cycle.

[0048] In summary, before the switching power supply unit 10 operates, the electric energy from the bus of the switching power supply unit 10 is used to supply power to the switching power supply chip IC1, so that the switching power supply unit 10 starts to operate and the output voltage V1 supplies power to the control unit 40 and the switching power supply chip IC1; when the load is operating normally, the current power supply state is maintained; when the load enters the standby state, the voltage at the power supply terminal of the switching power supply chip IC1 is pulled down to stop the switching power supply chip IC1 from working. At this time, the control unit 40 is powered by relying on the energy stored in the capacitor components inside the switching power supply unit 10 until the control unit 40 stops working when the stored energy is insufficient. It can be seen that compared with the switching power supply chip IC1 always being in the working state, the embodiment of the present invention intermittently shuts down the switching power supply chip IC1 during the standby of the load, thereby reducing the power loss of the switching power supply unit 10 during the standby of the load.

[0049] Optionally, based on any of the above-disclosed embodiments, refer to Figure 2 , when the switching power supply chip IC1 has a requirement for buck and voltage regulation of the output voltage V1, the control circuit further includes: a buck and voltage regulation unit 20, and the buck and voltage regulation unit 20 is connected between the output end of the switching power supply unit 10 and the power supply terminal of the control unit 40. Thus, after the output voltage V1 is converted into a stable output voltage V2 with a lower voltage level by the buck and voltage regulation unit 20, it is then supplied to the control unit 40. Correspondingly, when the switching power supply chip IC1 stops working due to an undervoltage state, the control unit 40 is powered by continuously consuming the energy stored in the capacitor components inside the switching power supply unit 10 and the buck and voltage regulation unit 20.

[0050] Optionally, based on any of the above-disclosed embodiments, the switching power supply chip IC1 is equipped with a constant current source, and the constant current source is electrically connected to the bus of the switching power supply unit 10. Thus, the electric energy from the bus of the switching power supply unit 10 is processed by the constant current source and then supplied to the switching power supply chip IC1 to meet the requirement of the switching power supply chip IC1 for a stable supply current.

[0051] The control unit 40 includes a main chip IC3; one signal output terminal of the main chip IC3 serves as the signal output terminal of the control unit 40; one signal output terminal of the main chip IC3 can be used to determine whether the load is in the startup state, and can output high and low level signals to the switching unit 30 according to the determination result; specifically, the second signal is a low level signal; the first signal is a high level signal.

[0052] Optionally, based on any of the above-disclosed embodiments, refer to Figure 3, a switching unit 30 is provided with a controllable switch to connect or disconnect a circuit. When the second signal is at a low level or in a high-impedance state and the first signal is at a high level, the switching unit 30 may include: a first P-type switching transistor Q1, a first N-type switching transistor Q2, a second N-type switching transistor Q3, a second P-type switching transistor Q4, a first diode D1, a first resistor R1, and a second resistor R2;

[0053] Wherein, the control electrode of the second N-type switching transistor Q3 serves as the fourth terminal of the switching unit 30;

[0054] The input electrode of the second N-type switching transistor Q3 is electrically connected to one end of the second resistor R2, and the other end of the second resistor R2 is electrically connected to the control electrode of the second P-type switching transistor Q4; the output electrode of the second N-type switching transistor Q3 is electrically connected to the first end of the first resistor R1;

[0055] The output electrode of the first N-type switching transistor Q2 serves as the second terminal of the switching unit 30;

[0056] The control electrode of the first N-type switching transistor Q2 is electrically connected to the second end of the first resistor R1;

[0057] The input electrode of the first P-type switching transistor Q1 serves as the first terminal of the switching unit 30; the input electrode of the first P-type switching transistor Q1 is electrically connected to the input electrode of the second P-type switching transistor Q4;

[0058] The control electrode of the first P-type switching transistor Q1 is electrically connected to the second end of the first resistor R1; the output electrode of the second P-type switching transistor Q4 is electrically connected to the second end of the first resistor R1;

[0059] The output electrode of the first P-type switching transistor Q1 is electrically connected to the anode of the first diode D1, and the cathode of the first diode D1 is electrically connected to the input electrode of the first N-type switching transistor Q2;

[0060] The cathode of the first diode D1 and the input electrode of the first N-type switching transistor Q2 serve as the third terminal of the switching unit 30.

[0061] Optionally, still referring to Figure 3 , the first P-type switching transistor Q1 is a PMOS transistor, and the gate, source, and drain of the PMOS transistor are respectively the control electrode, input electrode, and output electrode of the first P-type switching transistor Q1;

[0062] The first N-type switching transistor Q2 is an NMOS transistor, and the gate, drain, and source of the NMOS transistor are respectively the control electrode, input electrode, and output electrode of the first N-type switching transistor Q2;

[0063] The second N-type switching transistor Q3 is an NPN triode, and the base, collector, and emitter of the NPN triode are respectively the control electrode, input electrode, and output electrode of the first N-type switching transistor Q2;

[0064] The second P-type switching transistor Q4 is a PNP triode. The base, emitter, and collector of the PNP triode are respectively the control electrode, input electrode, and output electrode of the first N-type switching transistor Q2.

[0065] The working principle of the following Figure 3 shown scheme will be described in detail (for ease of description, hereinafter, the first P-type switching transistor Q1, the first N-type switching transistor Q2, the second N-type switching transistor Q3, and the second P-type switching transistor Q4 are respectively abbreviated as Q1 transistor, Q2 transistor, Q3 transistor, and Q4 transistor):

[0066] Before the switching power supply unit 10 works, the control unit 40 is not powered. The pin 1 of the control unit 40 is at a low level or in a high-impedance state. At this time, the Q3 transistor is cut off, the Q4 transistor is cut off, the control electrodes of the Q1 transistor and the Q2 transistor are both at a low level. The Q1 transistor conducts when there is electricity, the Q2 transistor is cut off, and the switching power supply chip IC1 receives electrical energy from the bus of the switching power supply unit 10, so that the switching power supply unit 10 starts to work and generates a stable output voltage V1 (for example, 15V voltage); this output voltage V1 is converted into a stable output voltage V2 of a lower voltage level (for example, 3.3V voltage) through the step-down and voltage regulation unit 20 to supply power to the control unit 40, so that the control unit 40 operates normally; at the same time, the output voltage V1 of the switching power supply unit 10 also supplies power to the switching power supply chip IC1 together with the constant current source, so that the switching power supply chip IC1 maintains stable operation.

[0067] During the normal operation of the control unit 40, if the control unit 40 detects that the load of the electrical equipment is turned on, it makes the pin 1 remain at a low level. At this time, the Q3 transistor and the Q4 transistor remain cut off, the Q1 transistor remains conducting, and the Q2 transistor remains cut off.

[0068] During the normal operation of the control unit 40, if the control unit 40 detects that there is no turn-on signal for the loads of the electrical equipment, it sets the pin 1 to a high level. At this time, the Q3 transistor conducts, the Q4 transistor conducts, the gates of the Q1 transistor and the Q2 transistor are both at a high level. At this time, the Q1 transistor is cut off, the Q2 transistor conducts, and the power supply terminal VCC voltage of the switching power supply chip IC1 is pulled low by the Q2 transistor, resulting in the switching power supply chip IC1 being in an undervoltage state and stopping working. The capacitor components inside the switching power supply unit 10 and the step-down and voltage regulation unit 20 continuously consume their own stored energy to supply power to the control unit 40 until the stored energy is insufficient and the control unit 40 stops working. The pin 1 returns to a low level. At this time, the Q3 transistor resumes cut-off, the Q4 transistor resumes cut-off, the gates of the Q1 transistor and the Q2 transistor return to a low level. Therefore, the Q1 transistor resumes conduction, the Q2 transistor resumes cut-off, the constant current source receives power from the bus (such as a DC bus) of the switching power supply unit 10, so that the switching power supply chip resumes working, and one signal output terminal of the main chip IC3 returns to a low level, and the control circuit runs in the next cycle.

[0069] Among them, the function of the first diode D1 is to utilize its own unidirectional conductivity to prevent the power supply terminal of the switching power supply chip IC1 from discharging externally through the Q1 transistor.

[0070] Optionally, based on any of the above-disclosed embodiments, the switching power supply unit 10 is a flyback switching power supply, but is not limited thereto.

[0071] A switching power supply refers to converting direct current into high-frequency alternating current through circuit control of a switching transistor for voltage transformation by a transformer to generate the required voltage. A flyback switching power supply refers to a switching power supply in which when the primary coil of the transformer is exactly excited by a DC pulse voltage, the secondary coil of the transformer does not provide power output to the load, but only provides power output to the load after the excitation voltage of the primary coil of the transformer is turned off.

[0072] Still referring to Figure 3 the switching power supply unit 10 includes: a first capacitor C1, a third resistor R3, a second capacitor C2, a second diode D2, a second transistor D3, a transformer T1, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a feedback circuit, and the switching power supply chip IC1;

[0073] Among them, one end of the first capacitor C1 is electrically connected to the DC bus, and the other end of the first capacitor C1 is grounded;

[0074] The first end of the third resistor R3 is electrically connected to the DC bus, and the first end of the third resistor R3 is also electrically connected to one end of the primary winding of the transformer T1. The second end of the third resistor R3 is electrically connected to the cathode of the second transistor D3;

[0075] The second capacitor C2 is connected in parallel with the third resistor R3;

[0076] The anode of the second transistor D3 is electrically connected to the other end of the primary winding of the transformer T1. The anode of the second transistor D3 is also electrically connected to the drain D of the switching power supply chip IC1;

[0077] One end of the secondary winding of the transformer T1 is electrically connected to the anode of the second diode D2, and the cathode of the second diode D2 is electrically connected to the other end of the secondary winding of the transformer T1;

[0078] The cathode of the second diode D2 is used as the output terminal (power supply terminal V1) of the switching power supply unit 10. It should be added that the auxiliary winding of the transformer T1 or other power supplies can also be used as the output terminal (power supply terminal V1) of the switching power supply unit 10.

[0079] The third capacitor C3 and the fourth capacitor C4 are both connected in parallel at the output terminal (power supply terminal V1) of the switching power supply unit 10;

[0080] The cathode of the second diode D2 is electrically connected to the feedback terminal FB of the switching power supply chip IC1 via at least the feedback circuit;

[0081] One end of the fifth capacitor C5 is electrically connected to the power supply terminal VCC of the switching power supply chip IC1, and the other end of the fifth capacitor C5 is grounded;

[0082] The source S of the switching power supply chip IC1 is grounded;

[0083] The switching power chip IC1 has a constant current source, one end of the constant current source is electrically connected to the drain D of the switching power chip IC1, and the other end of the constant current source is electrically connected to the power supply terminal VCC of the switching power chip IC1.

[0084] Among them, the first capacitor C1, the second capacitor C2, and the fourth capacitor C4 mainly play a filtering role, and generally ordinary capacitors can be used; the third capacitor C3 and the fifth capacitor C5 mainly play an energy storage role, so electrolytic capacitors are generally used.

[0085] According to the voltage level, the DC bus of the switching power supply unit 10 is generally a high-voltage DC bus, and correspondingly, the constant current source of the switching power supply chip IC1 is a high-voltage constant current source. When the pin 1 of the control unit 40 is at a low level or a high-impedance state, the switching power supply chip IC1 draws power from the high-voltage DC bus through the high-voltage constant current source to charge the fifth capacitor C5. When the charging voltage of the fifth capacitor C5 exceeds the starting voltage of the switching power supply chip IC1, the switching power supply chip IC1 starts to work, so that the switching power supply unit 10 obtains a stable output voltage V1.

[0086] Optionally, based on any of the embodiments disclosed above, still refer to Figure 3 The step-down voltage stabilizing unit 20 includes: a three-terminal voltage regulator IC2, a sixth capacitor C6 and a seventh capacitor C7; wherein the sixth capacitor C6 and the seventh capacitor C7 are both connected in parallel to the output end of the three-terminal voltage regulator IC2.

[0087] The sixth capacitor C6 mainly plays a filtering role, and generally a common capacitor can be used; the seventh capacitor C7 mainly plays an energy storage role, and generally an electrolytic capacitor is used.

[0088] like Figure 4 As shown, an embodiment of the present invention further discloses a control method, which can be applied to an electrical device; the electrical device comprises a control circuit and a load, and the control circuit is any electrical device control circuit disclosed above;

[0089] The control method comprises:

[0090] If the load of the electrical device is in the standby state, the control unit 40 sends at least a first signal to the switching unit 30;

[0091] According to the first signal, the switching unit 30 disconnects the power supply terminal of the switching power supply chip IC1 of the switching power supply unit 10 from the power supply terminal V1, and grounds the power supply terminal of the switching power supply chip IC1, so that the switching power supply chip IC1 is powered off.

[0092] Furthermore, the above control method may further include the following steps:

[0093] If the load of the electrical device is in the standby state, the control unit 40 also sends a second signal to the switching unit 30;

[0094] According to the second signal, the switching unit 30 disconnects the power supply terminal of the switching power supply chip IC1 from the ground, electrically connects the power supply terminal of the switching power supply chip IC1 to the power supply terminal V1, and electrically connects the switching power supply chip IC1 to the DC bus of the switching power supply unit 10, so that the switching power supply chip IC1 is powered on.

[0095] In addition, an embodiment of the present invention also discloses an electrical device, including: a control circuit and a load, and the control circuit is any one of the above-disclosed control circuits. The control circuit may be disposed on the first main board, that is, the drive board of the electrical device.

[0096] In the embodiment of the present invention, when the electrical device is in the standby state, the switching power supply chip IC1 is intermittently shut down to reduce the standby power consumption of the switching power supply unit 10 while meeting the user's demand for starting at any time. However, intermittently shutting down the switching power supply chip IC1 will cause the control unit 40 to be intermittently shut down. When a control instruction is sent, if the control unit 40 happens to be in the shutdown period, the control unit 40 cannot respond. However, the control unit 40 will resume starting later. Then, when the control instruction is sent again, the control unit 40 can make a response.

[0097] Correspondingly, the electrical device further includes a second main board. After the second main board sends a control instruction to the first main board, if it does not receive the signal fed back by the first main board after successfully responding to the control instruction, it means that the control unit 40 happens to be in the shutdown period. Then, after waiting for a preset time (for example, 1 second, which is enough for the control unit 40 to resume starting), the second main board sends the control instruction to the first main board again. In this way, while reducing the standby power consumption of the switching power supply unit 10, it will not affect the normal operation of the electrical device.

[0098] Wherein, the electrical device is, for example, a window air conditioner. At this time, the second main board is the main control board, and the control instruction is, for example, an instruction to turn on loads such as an air conditioner and a compressor.

[0099] An embodiment of the present invention also discloses an electrical device control method. The electrical device includes a control circuit and a load, and the control circuit is any one of the above-disclosed electrical device control circuits;

[0100] The described electrical equipment control method includes:

[0101] If the load of the electrical equipment is in the standby state, the control unit 40 sends at least a first signal to the switching unit 30;

[0102] According to the first signal, the switching unit 30 disconnects the power supply terminal of the switching power supply chip IC1 of the switching power supply unit 10 from the power supply terminal V1, and grounds the power supply terminal of the switching power supply chip IC1, so that the switching power supply chip IC1 is powered off.

[0103] Furthermore, the electrical equipment control method may further include the following steps:

[0104] If the load of the electrical equipment is in the standby state, the control unit 40 also sends a second signal to the switching unit 30;

[0105] According to the second signal, the switching unit 30 disconnects the power supply terminal of the switching power supply chip IC1 from the ground, electrically connects the power supply terminal of the switching power supply chip IC1 to the power supply terminal V1, and electrically connects the switching power supply chip IC1 to the DC bus of the switching power supply unit 10, so that the switching power supply chip IC1 is powered on.

[0106] In one embodiment, as Figure 5 shown, the electrical equipment control method further includes the following steps:

[0107] The second main board sends a load control instruction to the control unit 40;

[0108] Determine whether the second main board receives the signal fed back by the control unit 40 after successfully responding to the load control instruction;

[0109] If so, the control unit 40 sends a load control instruction to the load, and the load executes the load control instruction.

[0110] If not, the second main board sends a load control instruction to the control unit 40 again after waiting for a preset time.

[0111] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for the relevant parts, reference can be made to the description of the method part.

[0112] In the description, claims and drawings of the present invention, the terms "first", "second", etc. are used to distinguish similar different objects, and are not necessarily used to describe a specific order or sequence. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one" does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0113] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the embodiments of the present invention. Therefore, the embodiments of the present invention will not be limited to the embodiments shown herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control method, characterized in that: Applicable to electrical equipment, the control method comprises the following steps: If the load of the electrical device is in a standby state, the control unit (40) at least sends a first signal to the switching unit (30); According to the first signal, the switching unit (30) disconnects the power supply end of the switching power supply chip (IC1) in the switching power supply unit (10) from the power supply end (V1), and grounds the power supply end of the switching power supply chip (IC1), so that the switching power supply chip (IC1) is powered off.

2. The control method according to claim 1, characterized in that: The control method further comprises the following steps: If the load of the electrical device is in a standby state, the control unit (40) further sends a second signal to the switching unit (30); According to the second signal, the switching unit (30) disconnects the power supply end of the switching power supply chip (IC1) from the ground, electrically connects the power supply end of the switching power supply chip (IC1) to the power supply end (V1), and electrically connects the switching power supply chip (IC1) to the DC bus of the switching power supply unit (10), so that the switching power supply chip (IC1) is powered on.

3. A control circuit, characterized in that: Applicable to electrical equipment; the electrical equipment comprises a load; the control circuit comprises: a switching power supply unit (10), a switching unit (30), a control unit (40) and a power supply terminal (V1); Wherein, the switching power supply unit (10) comprises a switching power supply chip (IC1); The power supply end of the control unit (40) is electrically connected to the power supply end (V1); The first end of the switching unit (30) is electrically connected to the power supply end (V1), the second end of the switching unit (30) is grounded, the third end of the switching unit (30) is electrically connected to the power supply end of the switching power supply chip (IC1), and the fourth end of the switching unit (30) is electrically connected to the signal output end of the control unit (40); When the load is in a standby state, the control unit (40) is capable of sending at least a first signal to the switching unit (30); The switching unit (30) has at least a first working state. In the first working state, the switching unit (30) acquires the first signal, and the second end of the switching unit (30) is electrically connected to the third end of the switching unit (30).

4. The control circuit according to claim 3, characterized in that: The control unit (40) comprises a main chip (IC3); wherein one signal output end of the main chip (IC3) serves as a signal output end of the control unit (40); When the load is in a standby state, the control unit (40) can also send a second signal to the switching unit (30); The switching unit (30) also has a second working state. In the second working state, the switching unit (30) obtains the second signal, and the first end of the switching unit (30) is electrically connected to the third end; the switching power supply chip (IC1) is electrically connected to the DC bus of the switching power supply unit (10); wherein a controllable switch is provided inside the switching unit (30), so that the switching unit (30) can electrically connect the third end of the switching unit (30) to the first end or the second end of the switching unit (30) by turning the controllable switch on and off.

5. The control circuit according to claim 4, characterized in that: The switching unit (30) comprises: a first P-type switch tube (Q1), a first N-type switch tube (Q2), a second N-type switch tube (Q3), a second P-type switch tube (Q4), a first diode (D1), a first resistor (R1) and a second resistor (R2); Wherein, the control electrode of the second N-type switch tube (Q3) serves as the fourth end of the switching unit (30); The input electrode of the second N-type switch tube (Q3) is electrically connected to one end of the second resistor (R2), and the other end of the second resistor (R2) is electrically connected to the control electrode of the second P-type switch tube (Q4); the output electrode of the second N-type switch tube (Q3) is electrically connected to the first end of the first resistor (R1); The output electrode of the first N-type switch tube (Q2) serves as the second end of the switching unit (30); The control electrode of the first N-type switch tube (Q2) is electrically connected to the second end of the first resistor (R1); The input pole of the first P-type switch tube (Q1) serves as the first end of the switching unit (30); the input pole of the first P-type switch tube (Q1) is electrically connected to the input pole of the second P-type switch tube (Q4); The control electrode of the first P-type switch tube (Q1) is electrically connected to the second end of the first resistor (R1); the output electrode of the second P-type switch tube (Q4) is electrically connected to the second end of the first resistor (R1); The output electrode of the first P-type switch tube (Q1) is electrically connected to the anode of the first diode (D1), and the cathode of the first diode (D1) is electrically connected to the input electrode of the first N-type switch tube (Q2); The cathode of the first diode (D1) and the input electrode of the first N-type switch tube (Q2) serve as the third end of the switching unit (30).

6. The control circuit according to claim 5, characterized in that: The first P-type switch tube (Q1) is a PMOS tube, the first N-type switch tube (Q2) is an NMOS tube, the second N-type switch tube (Q3) is an NPN transistor, and the second P-type switch tube (Q4) is a PNP transistor.

7. The control circuit according to any one of claims 3 to 6, characterized in that: The switching power supply unit (10) comprises: a first capacitor (C1), a third resistor (R3), a second capacitor (C2), a second diode (D2), a second transistor (D3), a transformer (T1), a third capacitor (C3), a fourth capacitor (C4), a fifth capacitor (C5), a feedback circuit and the switching power supply chip (IC1); Wherein, one end of the first capacitor (C1) is electrically connected to the DC bus, and the other end of the first capacitor (C1) is grounded; The first end of the third resistor (R3) is electrically connected to the DC bus, the first end of the third resistor (R3) is also electrically connected to one end of the primary winding of the transformer (T1), and the second end of the third resistor (R3) is electrically connected to the cathode of the second transistor (D3); The second capacitor (C2) is connected in parallel with the third resistor (R3); The anode of the second transistor (D3) is electrically connected to the other end of the primary winding of the transformer (T1); the anode of the second transistor (D3) is also electrically connected to the drain (D) of the switching power supply chip (IC1); One end of the secondary winding of the transformer (T1) is electrically connected to the anode of the second diode (D2), and the cathode of the second diode (D2) is electrically connected to the other end of the secondary winding of the transformer (T1); The cathode of the second diode (D2) serves as the power supply terminal (V1); The third capacitor (C3) and the fourth capacitor (C4) are both connected in parallel to the power supply end (V1); The cathode of the second diode (D2) is electrically connected to the feedback end (FB) of the switching power supply chip (IC1) at least via the feedback circuit; One end of the fifth capacitor (C5) is electrically connected to the power supply end (VCC) of the switching power supply chip (IC1), and the other end of the fifth capacitor (C5) is grounded; The source (S) of the switching power supply chip (IC1) is grounded; The switching power chip (IC1) has a constant current source, one end of the constant current source is electrically connected to the drain (D) of the switching power chip (IC1), and the other end of the constant current source is electrically connected to the power supply end (VCC) of the switching power chip (IC1).

8. The control circuit according to any one of claims 3 to 6, characterized in that: The control circuit further comprises a step-down voltage stabilizing unit (20); the step-down voltage stabilizing unit (20) comprises: a three-terminal voltage regulator (IC2), a sixth capacitor (C6) and a seventh capacitor (C7); the input end of the three-terminal voltage regulator (IC2) is electrically connected to the power supply end (V1), and the output end of the three-terminal voltage regulator (IC2) is electrically connected to the power supply end of the control unit (40); the sixth capacitor (C6) and the seventh capacitor (C7) are both connected in parallel to the output end of the three-terminal voltage regulator (IC2).

9. An electrical device, characterized in that: include: A control circuit and a load, wherein the control circuit comprises: a switching power supply unit (10), a switching unit (30), a control unit (40) and a power supply terminal (V1); wherein the switching power supply unit (10) comprises a switching power supply chip (IC1); The power supply end of the control unit (40) is electrically connected to the power supply end (V1); The first end of the switching unit (30) is electrically connected to the power supply end (V1), the second end of the switching unit (30) is grounded, the third end of the switching unit (30) is electrically connected to the power supply end of the switching power supply chip (IC1), and the fourth end of the switching unit (30) is electrically connected to the signal output end of the control unit (40); the signal detection end of the control unit (40) is electrically connected to the load; When the load is in a standby state, the control unit (40) is capable of sending at least a first signal to the switching unit (30); The switching unit (30) has at least a first working state. In the first working state, the switching unit (30) acquires the first signal, and the second end of the switching unit (30) is electrically connected to the third end of the switching unit (30).

10. The electrical device according to claim 9, characterized in that The electrical device further comprises: a second mainboard; the second mainboard is electrically connected to a signal input terminal of the control unit (40); The second mainboard is capable of sending a load control instruction to the control unit (40); if no signal fed back by the control unit (40) after successfully responding to the load control instruction is received, the second mainboard is capable of sending the load control instruction to the control unit (40) again after waiting for a preset time; When the load is in a standby state, the control unit (40) can also send a second signal to the switching unit (30); The switching unit (30) also has a second working state. In the second working state, the switching unit (30) obtains the second signal, the first end of the switching unit (30) is electrically connected to the third end, and the switching power supply chip (IC1) is electrically connected to the DC bus of the switching power supply unit (10).

11. A method for controlling an electrical device, characterized in that: The following steps are involved: If the load of the electrical device is in a standby state, the control unit (40) at least sends a first signal to the switching unit (30); According to the first signal, the switching unit (30) disconnects the power supply end of the switching power supply chip (IC1) in the switching power supply unit (10) from the power supply end (V1), and grounds the power supply end of the switching power supply chip (IC1), so that the switching power supply chip (IC1) is powered off.

12. The electrical equipment control method according to claim 11, characterized in that: The following steps are involved: If the load of the electrical device is in a standby state, the control unit (40) further sends a second signal to the switching unit (30); According to the second signal, the switching unit (30) disconnects the power supply end of the switching power supply chip (IC1) from the ground, electrically connects the power supply end of the switching power supply chip (IC1) to the power supply end (V1), and electrically connects the switching power supply chip (IC1) to the DC bus of the switching power supply unit (10), so that the switching power supply chip (IC1) is powered on.

13. The electrical equipment control method according to claim 11 or 12, characterized in that: The electrical device further comprises a second mainboard; and the electrical device control method further comprises the following steps: The second mainboard sends a load control instruction to the control unit (40); The second mainboard determines whether a signal fed back by the control unit (40) after successfully responding to the load control instruction is obtained; If so, the control unit (40) sends the load control instruction to the load; The load executes the load control instruction; If not, the second mainboard sends a load control instruction to the control unit (40) again after waiting for a preset time.

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