Control circuit and electronic device

Abstract

The utility model relates to the technical field of integrated circuits, in particular to a control circuit and an electronic device. The control circuit comprises: a detection module for detecting a target circuit; the control chip is used for controlling a target circuit to work; the power supply module comprises a chip power supply end and a power supply switch unit, the chip power supply end is used for providing working voltage for controlling a chip, the power supply switch unit comprises a first control end, a first input end and a first output end, the first control end is used for controlling the power supply switch unit to be switched on and off, and the first input end is connected with the chip power supply end; the first output end is connected with a power supply pin of the control chip; and the switch module is used for controlling the on-off of the detection module, and the control end of the switch module is connected with the first output end. According to the control circuit, the switch module is connected with the detection module, so that the switch module can control the on-off of the detection module, and the loss of the control circuit can be reduced.

Description

Technical Field

[0001] This application relates to the field of integrated circuit technology, and in particular to a control circuit and electronic device. Background Technology

[0002] To suppress current waveform distortion and improve the power factor, modern electrical appliances with higher power (greater than 85W) and switching power supplies (capacitive loads) must employ PFC measures. PFC (Power Factor Correction) mainly controls the waveform of the input current to synchronize it with the input voltage waveform, thereby improving the power factor and reducing harmonic content.

[0003] Meanwhile, most electrical devices operate in standby mode for extended periods. This is typically achieved by shutting off the power supply to the power chip to reduce its power consumption. However, devices in standby mode still experience power losses. Current technologies do not fundamentally reduce the losses in the input and output detection circuits of PFC switching power supplies, and these losses constitute a major portion of the standby power consumption of PFC switching power supplies when powered by AC. Therefore, reducing the power losses of devices in standby mode has become a pressing issue. Utility Model Content

[0004] Therefore, it is necessary to provide a control circuit and electronic device that can effectively reduce the losses of electrical equipment in standby mode.

[0005] On the one hand, a control circuit is provided, comprising:

[0006] The detection module is used to detect the target circuit.

[0007] A control chip, connected to the target circuit, is used to control the operation of the target circuit;

[0008] A power module, connected to the control chip, includes a chip power supply terminal and a power switch unit. The chip power supply terminal is used to provide the operating voltage of the control chip. The power switch unit includes a first control terminal, a first input terminal and a first output terminal. The first control terminal is used to control the power switch unit to turn on and off. The first input terminal is connected to the chip power supply terminal and the first output terminal is connected to the power supply pin of the control chip.

[0009] A switch module is connected to the detection module and the power supply module, and is used to control the on / off state of the detection module. The control terminal of the switch module is connected to the first output terminal.

[0010] In one embodiment, the detection module includes an input detection unit and an output detection unit, and the switch module includes a first switch unit and a second switch unit. The first switch unit is used to control the on / off state of the input detection unit, and the control terminal of the first switch unit is connected to the first output terminal. The second switch unit is used to control the on / off state of the output detection unit, and the control terminal of the second switch unit is connected to the first output terminal.

[0011] In one embodiment, the switching module includes a first voltage regulation unit and a second voltage regulation unit, wherein the first voltage regulation unit is connected between the control terminal of the first switching unit and the first output terminal, and the second voltage regulation unit is connected between the control terminal of the second switching unit and the first output terminal.

[0012] In one embodiment, the first voltage regulation unit includes a first voltage regulation resistor, and the second voltage regulation unit includes a second voltage regulation resistor.

[0013] In one embodiment, the input terminal of the first switching unit is connected to the control chip, the output terminal of the first switching unit is connected to the input detection unit, the input terminal of the second switching unit is connected to the control chip, and the output terminal of the second switching unit is connected to the output detection unit.

[0014] In one embodiment, the input detection unit includes an input detection resistor, one end of which is connected to the output terminal of the first switching unit, and the other end of which is connected to the target circuit. The output detection unit includes an output detection resistor, one end of which is connected to the output terminal of the second switching unit, and the other end of which is connected to the target circuit.

[0015] In one embodiment, the switching module includes a switching transistor, which includes a metal-oxide-semiconductor field-effect transistor.

[0016] In one embodiment, the control circuit further includes:

[0017] The target circuit includes a second input terminal, a power factor correction module, and a second output terminal connected in sequence, and the detection module is used to detect the power factor correction module.

[0018] In one embodiment, the power factor correction module includes a boost unit connected to the control chip, and the detection module includes an input detection unit and an output detection unit, the input detection unit being connected between the boost unit and the second input terminal, and the output detection unit being connected between the boost unit and the second output terminal.

[0019] On one hand, an electronic device is provided, the electronic device including the control circuit provided in any of the foregoing embodiments.

[0020] The aforementioned control circuit and electronic device firstly connect the detection module to the switch module, allowing the switch module to control the on / off state of the detection module, thereby reducing the power loss of the control circuit. Furthermore, by connecting the first output terminal to both the control chip and the control terminal of the switch module, the control chip and switch module are linked, enabling control of both the switch module and the control chip's operating states simply by controlling the signal at the first control terminal, simplifying operation. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the control circuit provided in one embodiment;

[0023] Figure 2 This is a schematic diagram of the control circuit provided in another embodiment.

[0024] Explanation of reference numerals in the attached figures: Control circuit - 100; Detection module - 110; Input detection unit - 111; Output detection unit - 112; Control chip - 120; Power module - 130; Chip power terminal - 131; First control terminal - 132; First input terminal - 133; First output terminal - 134; Switch module - 140; First switch unit - 141; Second switch unit - 142; Target circuit - 150; Second input terminal - 151; Power factor correction module - 152; Boost unit - 1521; Input filter unit - 1522; Rectifier unit - 1523; Output filter unit - 1524; Second output terminal - 153. Detailed Implementation

[0025] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0027] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0028] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0029] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0030] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0031] In one embodiment, see Figure 1 and Figure 2 A control circuit 100 is provided. The control circuit 100 may include a detection module 110, a control chip 120, a power supply module 130, and a switch module 140.

[0032] The detection module 110 can be used to detect the target circuit 150. As an example, the target circuit 150 may include, but is not limited to, a power factor correction circuit. This embodiment does not limit the specific composition of the target circuit 150.

[0033] The control chip 120 is connected to the target circuit 150, and the control chip 120 can be used to control the operation of the target circuit 150. As an example, the control chip 120 may have multiple pins, and one of the pins of the control chip 120 may be connected to the target circuit 150. The control chip 120 can be...Figure 2 The chip U1 shown is shown.

[0034] The power module 130 is connected to the control chip 120. The power module 130 may include a chip power supply terminal 131 and a power switch unit. The chip power supply terminal 131 can be used to provide the operating voltage of the control chip 120. As an example, the chip power supply terminal 131 can be... Figure 2 The VDD terminal is shown in the diagram. The power switch unit may include a first control terminal 132, a first input terminal 133, and a first output terminal 134. The first control terminal 132 can be used to control the on / off state of the power switch unit. As an example, the first control terminal 132 can be... Figure 2 The PFC_ON terminal is shown in the diagram. The first input terminal 133 can be connected to the chip's power supply terminal 131, and the first output terminal 134 can be connected to the control chip 120. As an example, the first output terminal 134 can be... Figure 2 The VCC terminal shown can be connected to the power supply pin (VCC pin) of the control chip 120.

[0035] Specifically, the power switching unit may include a switching transistor. For example, the power switching unit may include a switching transistor Q2. As an example, Q2 can be an N-MOS transistor. In this case, the gate of the switching transistor Q2 can be connected to the PFC_ON terminal, one end of the switching transistor Q2 can be connected to the VDD terminal, and the other end of the switching transistor Q2 can be connected to the VCC terminal. It can be understood that in this embodiment, the switching transistor Q2 can be turned on or off by applying a high or low level to the gate of the switching transistor Q2 through the first control terminal 132 (PFC_ON terminal), thereby controlling the power module 130 to be turned on or off. Furthermore, please refer to... Figure 2 The power module 130 may further include resistors R12, R13, and R14. One end of resistor R12 can be connected to the VCC pin of the control chip 120, and the other end can be connected to the switching transistor Q2. The two ends of resistor R13 can be connected to the source and gate of the switching transistor Q2, respectively. One end of resistor R14 can be connected to the PFC_ON terminal, and the other end can be connected to the gate of the switching transistor Q2. The power module 130 may further include capacitor C3, one end of which is connected to the VDD terminal, and the other end can be grounded.

[0036] The switch module 140 is connected to the detection module 110 and the power supply module 130. The switch module 140 can be used to control the on / off state of the detection module 110, and the control terminal of the switch module 140 can be connected to the first output terminal 134. It can be understood that, at this time, the first output terminal 134 is connected to both the control chip 120 and the control terminal of the switch module 140. Furthermore, at this time, the output signal of the first output terminal 134 can be controlled by controlling the input signal of the first control terminal 132. This allows the input signal of the first control terminal 132 to simultaneously control both the switch module 140 and the control chip 120. For example, when the target circuit 150 needs to be in standby mode, a low level can be output through the first control terminal 132 (PFC_ON terminal) to turn off the switching transistor Q2, thereby turning off the power supply pin (VCC pin) of the control chip 120 (chip U1) to reduce the power consumption of the control chip 120. Simultaneously, because the VCC terminal is low, the switch module 140 can also be turned off, thereby putting the detection module 110 in a cutoff state. This effectively controls the control circuit 100 to have low power consumption. In another example, when the target circuit 150 needs to be in a working state, a high level can be output through the first control terminal 132 (PFC_ON terminal) to turn on the switching transistor Q2, thereby turning on the control chip 120 (chip U1). At the same time, because the VCC terminal is at a high level, the switching unit can also be turned on, thereby making the detection module 110 in a working state.

[0037] In this embodiment, the switch module 140 is first connected to the detection module 110, allowing the switch module 140 to control the on / off state of the detection module 110, thereby reducing the power loss of the control circuit 100. Furthermore, in this embodiment, the first output terminal 134 is connected to both the control chip 120 and the control terminal of the switch module 140, enabling the control chip 120 and the switch module 140 to work together. This allows the operation of both the switch module 140 and the control chip 120 to be controlled simultaneously simply by controlling the signal at the first control terminal 132, simplifying the operation.

[0038] Please see Figure 1 and Figure 2 The specific composition of the control circuit 100 is illustrated below. The detection module 110 may include an input detection unit 111 and an output detection unit 112. The input detection unit 111 and the output detection unit 112 may be connected to different locations in the target circuit 150, respectively. The input detection unit 111 may be used to detect multiple parameters of the electrical signal input to the target circuit 150, and the output detection unit 112 may be used to detect multiple parameters of the electrical signal output from the target circuit 150.

[0039] Input detection unit 111 may include input detection resistors. For example, the input detection resistors may include resistors R5, R7, and R9. One end of the input detection resistor can be connected to the output terminal of the switching unit, and the other end is connected to the target circuit 150. Output detection unit 112 includes output detection resistors. For example, the output detection resistors may include resistors R4, R6, and R8. One end of the output detection resistor is connected to the output terminal of the second switching unit 142, and the other end is connected to the target circuit 150. The operating status of the target circuit 150 can be determined by detecting the voltage values ​​across the input and output detection resistors.

[0040] The switching module 140 may include a first switching unit 141 and a second switching unit 142. The first switching unit 141 controls the on / off state of the input detection unit 111, and its control terminal is connected to the first output terminal 134. The second switching unit 142 controls the on / off state of the output detection unit 112, and its control terminal is connected to the first output terminal 134. Specifically, the first switching unit 141 may include a first switching transistor, and the second switching unit 142 may include a second switching transistor. Both the first and second switching transistors may be high-voltage resistant metal-oxide-semiconductor field-effect transistors (MOSFETs). Further, the input terminal (source) of the first switching transistor is connected to the control chip 120, the output terminal (drain) of the first switching unit 141 is connected to the input detection unit 111, and the control terminal of the first switching unit 141 is the gate of the first switching transistor. The input terminal (source) of the second switching unit 142 is connected to the control chip 120, the output terminal (drain) of the second switching unit 142 is connected to the output detection unit 112, and the control terminal of the second switching unit 142 is the gate of the second switching transistor. Of course, the first switching unit 141 and the second switching unit 142 may also have other forms. For example, the first switching unit 141 and the second switching unit 142 may also include transistors, etc.

[0041] Furthermore, the switching module 140 may also include a first voltage regulation unit and a second voltage regulation unit. The first voltage regulation unit is connected between the control terminal and the first output terminal of the first switching unit. The second voltage regulation unit is connected between the control terminal and the first output terminal of the second switching unit. For example, the first voltage regulation unit may include a first voltage regulation resistor (e.g., resistor R11). One end of the first voltage regulation resistor is connected to the control terminal of the first switching unit 141, and the other end is connected to the first output terminal 134. The first voltage regulation unit may also include a second voltage regulation resistor (e.g., resistor R10). One end of the second voltage regulation resistor is connected to the control terminal of the second switching unit 142, and the other end is connected to the first output terminal 134. In this case, by setting the first voltage regulation resistor and the second voltage regulation resistor, protection for the first and second switching transistors can be achieved.

[0042] The control chip 120 can have multiple pins to implement its functions. For example, the first pin (INV pin) of the control chip 120 can serve as the inverting input of an error amplifier, and this pin can be connected to the second switching unit 142. The second pin (MULT pin) of the control chip 120 can serve as the output of the error amplifier (voltage comparator), and this pin can be connected to both the first and second switching units 141 and 142. The third pin of the control chip 120 can serve as the input of an internal multiplier, and this pin can be connected to the first switching unit 141. The fourth pin (CS pin) of the control chip 120 can serve as a current sensing input, and this pin can be connected to the target circuit 150 via resistor R16. Furthermore, the fourth pin of the control chip 120 can also be connected to one end of capacitor C8. The other end of capacitor C8 can be grounded. The fifth pin (ZCD pin) of the control chip 120 can serve as a zero-current sensing input, and this pin can be connected to the target circuit 150 via resistor R18. The sixth pin (GND pin) of control chip 120 can be grounded. One end of capacitor C2 can be connected to the sixth pin, and the other end of capacitor C2 can be connected to resistor R12. The seventh pin (OUT pin) of control chip 120 can be used as an output terminal. The eighth pin (VCC pin) of control chip 120 can be used as a power supply pin and can be connected to capacitor C2.

[0043] In addition, the control circuit 100 may also include other resistors and capacitors. For example, the control circuit 100 may include resistors R15, R17, R18, and R19. The control circuit 100 may also include capacitors C4, C5, C6, and C7. Specifically, resistor R15 and capacitor C4 can be connected in parallel, and the two are connected between the first and third pins of the control chip 120. Resistor R17 and capacitor C7 can be connected in parallel, and the two are connected between the second and third pins of the control chip 120. Resistor R19 and capacitor C5 are connected in series and then in parallel with capacitor C6, and are connected between the second pin of the control chip 120 and the ground terminal. One end of resistor R18 is connected to the fifth pin, and the other end is grounded.

[0044] It is understood that the control circuit 100 described above can also take other forms, and is not limited to the form of the control circuit 100 provided in this application, as long as it can achieve the function of the control circuit 100.

[0045] In one embodiment, the control circuit 100 may include a target circuit 150. As an example, the target circuit 150 may be a power factor correction circuit, etc.

[0046] The target circuit 150 may include a second input terminal 151 (Vin / AC Input), a power factor correction module 152, and a second output terminal 153 (Vout) connected in sequence. The detection module 110 can be used to detect the power factor correction module 152. As an example, the detection module 110 can be connected to the power factor correction module 152.

[0047] Specifically, the power factor correction module 152 may include a boost unit 1521. The boost unit 1521 may include a BOOST boost circuit, etc. Specifically, the boost unit 1521 may include an inductor L1, etc. In this case, the boost unit 1521 can be connected to the control chip 120. For example, one output terminal (Vaux terminal) of the boost unit 1521 can be connected to the zero-current detection (ZCD) pin of the control chip 120. Further, an input detection unit 111 is connected between the boost unit 1521 and the second input terminal 151, and an output detection unit 112 is connected between the boost unit 1521 and the second output terminal 153.

[0048] In addition, please see Figure 1 and Figure 2The power factor correction module 152 may further include an input filter unit 1522, a rectifier unit 1523, and an output filter unit 1524. The input filter unit 1522 may include an electromagnetic interference filter (EMIFilter). The two input terminals of the EMIFilter can be connected to the second input terminal 151 (Vin, AC input), respectively. The two input terminals of the rectifier unit 1523 (BD1) (e.g., the second and third terminals of the rectifier unit 1523) can be connected to the two output terminals of the input filter unit 1522, respectively. One of the two output terminals of the rectifier unit 1523 (e.g., the fourth terminal of the rectifier unit 1523) can be grounded, and the other (e.g., the first terminal of the rectifier unit 1523) can be connected to the boost unit 1521. At this time, the input detection unit 111 can be connected between the rectifier unit 1523 and the boost unit 1521. Furthermore, one end of the capacitor C1 can be connected between the rectifier unit 1523 and the boost unit 1521, and the other end can be grounded.

[0049] The input terminal of the output filtering unit 1524 can be connected to the output terminal of the boost unit 1521, and the output terminal of the output filtering unit 1524 can be connected to the second output terminal 153 (Vout). At this time, the output detection unit 112 can be connected between the output filtering unit 1524 and the second output terminal 153 (Vout). Furthermore, the output filtering unit 1524 may also include diodes D1 and D2, a switching transistor Q1, resistors R1, R2, and R3, and a polarized capacitor EC1. For example, diode D1 can be connected between the output terminal of inductor L1 and the second output terminal 153 (Vout). Diode D2 can be connected between the input terminal of inductor L1 and the second output terminal 153 (Vout). The input terminal of switching transistor Q1 can be connected to diode D2, the output terminal of switching transistor Q1 can be connected to resistor R1 and then grounded, the control terminal of switching transistor Q1 can be connected to resistors R2 and R3 respectively, and resistor R3 can also be connected to the fourth pin of the control chip 120. One end of the polarized capacitor EC1 can be connected to the second output terminal 153 (Vout), and the other end of the polarized capacitor EC1 can be connected between the resistor R1 and the ground terminal.

[0050] Based on the same concept, in one embodiment, an electronic device is provided. See also... Figure 1 and Figure 2 The electronic device may include the control circuit 100 provided in any of the foregoing embodiments. As an example, the electronic device may include, but is not limited to, household appliances or communication equipment equipped with motor drives, transformers, frequency converters, etc.

[0051] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0052] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A control circuit, characterized in that, include: The detection module is used to detect the target circuit. A control chip, connected to the target circuit, is used to control the operation of the target circuit; A power module, connected to the control chip, includes a chip power supply terminal and a power switch unit. The chip power supply terminal is used to provide the operating voltage of the control chip. The power switch unit includes a first control terminal, a first input terminal and a first output terminal. The first control terminal is used to control the power switch unit to turn on and off. The first input terminal is connected to the chip power supply terminal and the first output terminal is connected to the power supply pin of the control chip. A switch module is connected to the detection module and the power supply module, and is used to control the on / off state of the detection module. The control terminal of the switch module is connected to the first output terminal.

2. The control circuit according to claim 1, characterized in that, The detection module includes an input detection unit and an output detection unit. The switch module includes a first switch unit and a second switch unit. The first switch unit is used to control the on / off state of the input detection unit, and the control terminal of the first switch unit is connected to the first output terminal. The second switch unit is used to control the on / off state of the output detection unit, and the control terminal of the second switch unit is connected to the first output terminal.

3. The control circuit according to claim 2, characterized in that, The switching module includes a first voltage regulation unit and a second voltage regulation unit. The first voltage regulation unit is connected between the control terminal of the first switching unit and the first output terminal, and the second voltage regulation unit is connected between the control terminal of the second switching unit and the first output terminal.

4. The control circuit according to claim 3, characterized in that, The first voltage regulation unit includes a first voltage regulation resistor, and the second voltage regulation unit includes a second voltage regulation resistor.

5. The control circuit according to claim 2, characterized in that, The input terminal of the first switching unit is connected to the control chip, the output terminal of the first switching unit is connected to the input detection unit, the input terminal of the second switching unit is connected to the control chip, and the output terminal of the second switching unit is connected to the output detection unit.

6. The control circuit according to claim 5, characterized in that, The input detection unit includes an input detection resistor, one end of which is connected to the output terminal of the first switching unit, and the other end of which is connected to the target circuit. The output detection unit includes an output detection resistor, one end of which is connected to the output terminal of the second switching unit, and the other end of which is connected to the target circuit.

7. The control circuit according to claim 1, characterized in that, The switching module includes a switching transistor, which is a metal-oxide-semiconductor field-effect transistor.

8. The control circuit according to claim 1, characterized in that, The control circuit also includes: The target circuit includes a second input terminal, a power factor correction module, and a second output terminal connected in sequence, and the detection module is used to detect the power factor correction module.

9. The control circuit according to claim 8, characterized in that, The power factor correction module includes a boost unit connected to the control chip. The detection module includes an input detection unit and an output detection unit. The input detection unit is connected between the boost unit and the second input terminal, and the output detection unit is connected between the boost unit and the second output terminal.

10. An electronic device, characterized in that, The electronic device includes the control circuitry as described in any one of claims 1-9.

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