Control circuit and electronic device

Abstract

The invention 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] The present application relates to the technical field of integrated circuits, and particularly to a control circuit and an electronic device. Background Art

[0002] In order to suppress the distortion of the current waveform and improve the power factor, modern electrical appliances with relatively large power (greater than 85W) and having a switching power supply (capacitive load) must adopt PFC measures. PFC (Power Factor Correction), also known as power factor correction, mainly controls the waveform of the input current to make it synchronous with the input voltage waveform, improve the power factor, and reduce the harmonic content.

[0003] At the same time, most electrical devices work in the standby state for a long time. Usually, the power supply of the power supply chip is turned off to reduce the power consumption of the power supply chip. However, the electrical devices in the standby state still have power consumption. In the related art, the power consumption on the input and output detection circuits of the PFC switching power supply has not been completely reduced from the circuit, and this part of the power consumption is the main part of the standby power consumption of the PFC switching power supply when the mains power is input. Therefore, how to reduce the power consumption of electrical devices in the standby state has become an urgent problem to be solved. Summary of the Invention

[0004] Based on this, it is necessary to provide a control circuit and an electronic device that can effectively reduce the power consumption of electrical devices in the standby state.

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

[0006] A detection module for detecting a target circuit;

[0007] A control chip connected to the target circuit for controlling the operation of the target circuit;

[0008] A power supply module connected to the control chip, including 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 end, a first input end, and a first output end. The first control end is used to control the on / off of the power switch unit. The first input end is connected to the chip power supply terminal, and the first output end is connected to the power supply pin of the control chip;

[0009] A switch module connected to the detection module and the power supply module for controlling the on / off of the detection module, and the control end of the switch module is connected to the first output end.

[0010] In one embodiment, 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 of the input detection unit, and the control end of the first switch unit is connected to the first output end, the second switch unit is used to control the on / off of the output detection unit, and the control end of the second switch unit is connected to the first output end.

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

[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 end of the first switch unit is connected to the control chip, the output end of the first switch unit is connected to the input detection unit, the input end of the second switch unit is connected to the control chip, and the output end of the second switch unit is connected to the output detection unit.

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

[0015] In one embodiment, the switch module includes a switching tube, and the switching tube includes a metal oxide semiconductor field effect transistor.

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

[0017] A target circuit, the target circuit includes a second input end, a power factor correction module, and a second output end 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 boosting unit, the boosting unit is 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 boosting unit and the second input end, and the output detection unit is connected between the boosting unit and the second output end.

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

[0020] For the above control circuit and electronic device, first, by arranging a switch module to connect to a detection module, the switch module can be made to control the on / off of the detection module, thereby reducing the loss of the control circuit. Moreover, by arranging the first output end to be connected to both the control chip and the control end of the switch module, the control chip and the switch module are made to be linked, and thus, by only controlling the signal of the first control end, the working states of the switch module and the control chip can be controlled simultaneously, and the operation is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application 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 drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 Schematic diagram of the control circuit provided in one embodiment;

[0023] Figure 2 Schematic diagram of the control circuit provided in another embodiment.

[0024] Description of reference numerals: control circuit - 100; detection module - 110; input detection unit - 111; output detection unit - 112; control chip - 120; power supply module - 130; chip power supply terminal - 131; first control end - 132; first input end - 133; first output end - 134; switch module - 140; first switch unit - 141; second switch unit - 142; target circuit - 150; second input end - 151; power factor correction module - 152; boost unit - 1521; input filter unit - 1522; rectification unit - 1523; output filter unit - 1524; second output end - 153. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. Embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[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 technical field to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

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

[0028] It can be understood that for "connection" in the following embodiments, if there is transmission of electrical signals or data between the connected circuits, modules, units, etc., it should be understood as "electrical connection", "communication connection", etc.

[0029] It can be understood that "at least one" means one or more, and "a plurality" means two or more. "At least part of an element" means part or all of the element.

[0030] As used herein, the singular forms "a", "an", and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprises / include" or "has" etc. specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the related listed items.

[0031] In one embodiment, refer to 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, etc. The specific composition of the target circuit 150 is not limited in this embodiment.

[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 may beFigure 2 The chip U1 shown in

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

[0035] Specifically, the power switch unit may include a switching transistor. For example, the power switch unit may include a switching transistor Q2. As an example, Q2 may be an N-MOS. At this time, the gate of the switching transistor Q2 may be connected to the PFC_ON terminal, one end of the switching transistor Q2 may be connected to the VDD terminal, and the other end of the switching transistor Q2 may be connected to the VCC terminal. It can be understood that in this embodiment, the on / off of the switching transistor Q2 can be controlled by applying a high level or a low level to the gate of the switching transistor Q2 through the first control terminal 132 (PFC_ON terminal), so as to control the on / off of the power supply module 130. In addition, please refer to Figure 2 , the power supply module 130 may further include a resistor R12, a resistor R13, and a resistor R14. One end of the resistor R12 may be connected to the VCC pin of the control chip 120, and the other end may be connected to the switching transistor Q2. Both ends of the resistor R13 may be respectively connected to the source of the switching transistor Q2 and the gate of the switching transistor Q2. One end of the resistor R14 may be connected to the PFC_ON terminal, and the other end may be connected to the gate of the switching transistor Q2. The power supply module 130 may further include a capacitor C3. One end of the capacitor C3 is connected to the VDD terminal, and the other end may 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 of the detection module 110, and the control end of the switch module 140 can be connected to the first output end 134. It can be understood that at this time, the first output end 134 is connected to both the control chip 120 and the control end of the switch module 140. Further, at this time, the output signal of the first output end 134 can be controlled by controlling the input signal of the first control end 132, which enables the switch module 140 and the control chip 120 to be controlled simultaneously through the input signal of the first control end 132. Exemplarily, when the target circuit 150 needs to be in the standby state, a low level can be output through the first control end 132 (PFC_ON end) 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. At the same time, because the VCC end is at a low level, the switch module 140 can also be turned off, so that the detection module 110 is in the cut-off state. In this way, the control circuit 100 can be effectively controlled to have lower energy consumption. In another example, when the target circuit 150 needs to be in the working state, a high level can be output through the first control end 132 (PFC_ON end) to turn on the switching transistor Q2, thereby turning on the control chip 120 (chip U1). At the same time, because the VCC end is at a high level, the switch unit can also be turned on, so that the detection module 110 is in the working state.

[0037] In this embodiment, first, by setting the switch module 140 to be connected to the detection module 110, the switch module 140 can control the on / off of the detection module 110, and further, the loss of the control circuit 100 can be reduced. Moreover, in this embodiment, by setting the first output end 134 to be connected to both the control chip 120 and the control end of the switch module 140, the control chip 120 and the switch module 140 are linked, and further, the working states of the switch module 140 and the control chip 120 can be controlled simultaneously only by controlling the signal of the first control end 132, and the operation is simple.

[0038] Please refer to Figure 1 and Figure 2 , the specific composition of the control circuit 100 is described exemplarily as follows. The detection module 110 can include an input detection unit 111 and an output detection unit 112. The input detection unit 111 and the output detection unit 112 can be respectively connected to different positions of the target circuit 150. The input detection unit 111 can be used to detect multiple parameters of the electrical signal input by the target circuit 150, and the output detection unit 112 can be used to detect multiple parameters of the electrical signal output by the target circuit 150.

[0039] The input detection unit 111 may include an input detection resistor. For example, the input detection resistor may include resistor R5, resistor R7, and resistor R9. At this time, one end of the input detection resistor may be connected to the output end of the switch unit, and the other end of the input detection resistor is connected to the target circuit 150. The output detection unit 112 includes an output detection resistor. For example, the output detection resistor may include resistor R4, resistor R6, and resistor R8. One end of the output detection resistor is connected to the output end of the second switch unit 142, and the other end of the output detection resistor is connected to the target circuit 150. At this time, the operating condition of the target circuit 150 can be determined by detecting the voltage values on the input detection resistor and the output detection resistor.

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

[0041] In addition, the switch module 140 may further include a first voltage regulating unit and a second voltage regulating unit. The first voltage regulating unit is connected between the control terminal and the first output terminal of the first switch unit. The second voltage regulating unit is connected between the control terminal and the first output terminal of the second switch unit. For example, the first voltage regulating unit may include a first voltage regulating resistor (e.g., resistor R11). One end of the first voltage regulating resistor is connected to the control terminal of the first switch unit 141, and the other end of the first voltage regulating resistor is connected to the first output terminal 134. The first voltage regulating unit may further include a second voltage regulating resistor (e.g., resistor R10). One end of the second voltage regulating resistor is connected to the control terminal of the second switch unit 142, and the other end of the second voltage regulating resistor is connected to the first output terminal 134. At this time, by setting the first voltage regulating resistor and the second voltage regulating resistor, the protection of the first switch transistor and the second switch transistor can be achieved.

[0042] The control chip 120 may have multiple pins to implement the functions of the control chip 120. For example, the first pin (INV pin) of the control chip 120 may be used as the inverting input terminal of the error amplifier, and the first pin may be connected to the second switch unit 142. The second pin (MULT pin) of the control chip 120 may be used as the output terminal of the error amplifier (voltage comparator), and the second pin may be connected to the first switch unit 141 and the second switch unit 142. The third pin of the control chip 120 may be used as the input terminal of the internal multiplier, and the third pin may be connected to the first switch unit 141. The fourth pin (CS pin) of the control chip 120 may be used as the current detection input terminal, and the fourth pin of the control chip 120 may be connected to the target circuit 150 from the resistor R16. In addition, the fourth pin of the control chip 120 may also be connected to one end of the capacitor C8. The other end of the capacitor C8 may be grounded. The fifth pin (ZCD pin) of the control chip 120 may be used as the zero current detection input terminal, and the fifth pin of the control chip 120 may be connected to the target circuit 150 from the resistor R18. The sixth pin (GND pin) of the control chip 120 may be grounded, and the sixth pin may be connected to one end of the capacitor C2, and the other end of the capacitor C2 may be connected to the resistor R12. The seventh pin (OUT pin) of the control chip 120 may be used as the output terminal. The eighth pin (VCC pin) of the control chip 120 may be used as the power supply pin, and the eighth pin of the control chip 120 may be connected to the capacitor C2.

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

[0044] It can be understood that the above control circuit 100 may also adopt 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 functions 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 or the like.

[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 may be used to detect the power factor correction module 152. As an example, the detection module 110 may 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 or the like. Specifically, the boost unit 1521 may include an inductor L1 and the like. At this time, the boost unit 1521 may be connected to the control chip 120. For example, an output terminal (Vaux terminal) of the boost unit 1521 may be connected to the zero current detection (ZCD) pin of the control chip 120. Further, the input detection unit 111 is connected between the boost unit 1521 and the second input terminal 151, and the output detection unit 112 is connected between the boost unit 1521 and the second output terminal 153.

[0048] In addition, please refer to Figure 1 and Figure 2, the power factor correction module 152 may further include an input filtering unit 1522, a rectifying unit 1523, an output filtering unit 1524, etc. The input filtering unit 1522 may include an electromagnetic interference filter (EMI Filter). Two input terminals of the electromagnetic interference filter may be respectively connected to the second input terminal 151 (Vin, AC input). Two input terminals of the rectifying unit 1523 (BD1) (for example, the second terminal and the third terminal of the rectifying unit 1523) may be respectively connected to two output terminals of the input filtering unit 1522. One of the two output terminals of the rectifying unit 1523 (for example, the fourth terminal of the rectifying unit 1523) may be grounded, and the other (for example, the first terminal of the rectifying unit 1523) may be connected to the boosting unit 1521. At this time, the input detection unit 111 may be connected between the rectifying unit 1523 and the boosting unit 1521. In addition, one end of the capacitor C1 may be connected between the rectifying unit 1523 and the boosting unit 1521, and the other end may be grounded.

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

[0050] Based on the same inventive concept, in one embodiment, an electronic device is provided. Please refer to 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 devices provided with motor drives, transformers, frequency converters, etc.

[0051] In the description of this specification, the descriptions referring to terms such as "some embodiments", "other embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

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

[0053] The above-described embodiments only represent several implementation manners of the present application. The descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A control circuit, characterized in that, Comprising: A detection module for detecting a target circuit; A control chip connected to the target circuit for controlling the operation of the target circuit; A power supply module connected to the control chip, including 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 end, a first input end, and a first output end. The first control end is used to control the on / off of the power switch unit. The first input end is connected to the chip power supply terminal, and the first output end is connected to the power supply pin of the control chip; A switch module connected to the detection module and the power supply module for controlling the on / off of the detection module, and the control end of the switch module is connected to the first output end.

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 of the input detection unit, and the control end of the first switch unit is connected to the first output end. The second switch unit is used to control the on / off of the output detection unit, and the control end of the second switch unit is connected to the first output end.

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

4. The control circuit according to claim 3, wherein, 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, wherein The input end of the first switch unit is connected to the control chip, and the output end of the first switch unit is connected to the input detection unit. The input end of the second switch unit is connected to the control chip, and the output end of the second switch 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 the input detection resistor is connected to the output end of the first switch unit, and the other end of the input detection resistor is connected to the target circuit. The output detection unit includes an output detection resistor. One end of the output detection resistor is connected to the output end of the second switch unit, and the other end of the output detection resistor is connected to the target circuit.

7. The control circuit according to claim 1, characterized in that, The switch module includes a switching tube, and the switching tube includes a metal oxide semiconductor field effect transistor.

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

9. The control circuit according to claim 8, wherein, The power factor correction module includes a boosting 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 boosting unit and the second input end, and the output detection unit is connected between the boosting unit and the second output end.

10. An electronic device, characterized in that, The electronic device includes the control circuit according to any one of claims 1-9.

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