A standby circuit with linkage control of different reference grounds

Abstract

This invention provides a standby circuit for coordinated control of different reference grounds, comprising: a microcontroller circuit, multiple rectifier circuits, a control circuit, and optocouplers. Each rectifier circuit is located on one side of a transformer winding and is connected to its corresponding control circuit. The rectifier circuit rectifies the current supplied by the transformer winding and obtains a rectified voltage based on the rectified circuit. Each control circuit is connected to its corresponding reference ground circuit, and the control circuits are sequentially connected via optocouplers. The control circuit obtains a supply voltage based on the rectified voltage and sends the supply voltage to the corresponding reference ground circuit. The microcontroller circuit is connected to the first control circuit and sends control signals to the control circuit to control the power supply to the reference ground circuit. This invention achieves minimal or even zero power consumption in standby mode, with simple circuit connections, few components, low cost, and stable performance.

Description

Technical Field

[0001] This invention relates to the field of lighting equipment technology, and in particular to a standby circuit for linkage control of different reference grounds. Background Technology

[0002] Currently, LED driver power supplies, switching power supplies, and other electronic products are widely used in the market, and the requirement for low standby power consumption has been fully covered, achieving low or even zero power consumption in standby mode. For standby circuits that control different reference grounds in a coordinated manner, multiple different reference grounds can be controlled simultaneously. Their circuit structure is relatively simple, with fewer components, thus reducing costs and facilitating product miniaturization. Therefore, a standby circuit capable of controlling different reference grounds in a coordinated manner is urgently needed. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a standby circuit that links and controls different reference grounds.

[0004] To achieve the above objectives, the present invention provides the following solution:

[0005] A standby circuit for linkage control of different reference grounds includes: a microcontroller circuit, multiple rectifier circuits, a control circuit, and an optocoupler;

[0006] Each of the rectifier circuits is disposed on one side of the transformer winding. The rectifier circuit is connected to the corresponding control circuit. The rectifier circuit is used to rectify the current supplied by the transformer winding and obtain a rectified voltage based on the rectified circuit. Each of the control circuits is connected to a corresponding reference ground circuit. The control circuits are connected sequentially through the optocoupler. The control circuit is used to obtain a supply voltage based on the rectified voltage and send the supply voltage to the corresponding reference ground circuit. The microcontroller circuit is connected to the first control circuit. The microcontroller circuit is used to send control signals to the control circuit to realize the power supply control of the reference ground circuit.

[0007] Preferably, the rectifier circuit includes: a rectifier diode and a capacitor;

[0008] One end of the rectifier tube is connected to one end of the transformer winding; the other end of the rectifier tube is connected to one end of the capacitor; the other end of the capacitor is connected to the reference ground circuit and the other end of the transformer winding, respectively.

[0009] Preferably, the first control circuit comprises: three resistors, two transistors, and one diode;

[0010] One of the three resistors is connected to the primary side of the microcontroller circuit and the corresponding optocoupler; another of the three resistors is connected to the gate of the microcontroller circuit and one of the two transistors; one end of the third of the three resistors is connected to the drain of one of the two transistors and the gate of the other of the two transistors; the source of one of the two transistors is connected to reference ground; the other end of the third of the three resistors is connected to the source of the other of the two transistors; and the drain of the other of the two transistors is connected to a diode.

[0011] Preferably, the control circuit other than the first control circuit includes: two resistors, a transistor and a shunt diode;

[0012] One of the two resistors is connected to the gate of the transistor and the secondary side of the previous optocoupler, respectively; the other of the two resistors is connected to the gate of the transistor and reference ground, respectively; the drain of the transistor is connected to the secondary side of one of the optocouplers; the shunt diodes are connected to the source of the transistor and the primary side of the corresponding optocoupler, respectively.

[0013] Preferably, one of the two transistors is a PMOS transistor and the other is an NMOS transistor.

[0014] Preferably, the control signal includes a high output signal and a low output signal.

[0015] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0016] This invention enables one signal to control one, two, three, ... or N power supply voltage loops with different reference grounds. It can achieve minimal or even zero power consumption in standby mode. Its circuit connection is simple, the number of components is small, the cost is low, and the performance is stable. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a block diagram illustrating the power supply circuit, linkage control circuit, and microcontroller in an embodiment of the present invention.

[0019] Figure 2This is a schematic diagram illustrating the application of a standby circuit that implements linkage control of multiple different reference grounds in an embodiment of the present invention. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0022] The terms "first," "second," "third," and "fourth," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, including a series of steps, processes, methods, etc., is not limited to the steps listed, but may optionally include steps not listed, or may optionally include other steps inherent to these processes, methods, products, or devices.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1 and Figure 2As shown, this invention provides a standby circuit for coordinated control of different reference grounds, including: a microcontroller circuit, multiple rectifier circuits, control circuits (control circuit 1, control circuit 2, ...), and optocouplers (DU1, DU2, ...). Each rectifier circuit is disposed on one side of a transformer winding, and the rectifier circuit is connected to the corresponding control circuit. The rectifier circuit is used to rectify the current supplied by the transformer winding and obtain a rectified voltage based on the rectified circuit. Each control circuit is connected to a corresponding reference ground circuit (circuit 1, circuit 2, ...), and the control circuits are connected sequentially through the optocouplers. The control circuit is used to obtain a supply voltage based on the rectified voltage and send the supply voltage to the corresponding reference ground circuit. The microcontroller circuit is connected to the first control circuit. The microcontroller circuit is used to send a control signal PW to the control circuit to realize the power supply control of the reference ground circuit. The rectifier circuit includes: rectifier diodes (D2, D3, D4, ...) and capacitors (C2, C3, C4, ...); one end of each rectifier diode is connected to one end of the transformer winding; the other end of each rectifier diode is connected to one end of each capacitor; the other end of each capacitor is connected to both the reference ground circuit and the other end of the transformer winding. The first control circuit includes: three resistors (R1, R2, and R3), two transistors (Q1 and Q3), and one diode D8.

[0025] One of the three resistors, R2, is connected to the primary side of the microcontroller circuit and the corresponding optocoupler, respectively; another of the three resistors, R3, is connected to the gate of the microcontroller circuit and one of the two transistors, Q3, respectively; one end of the third of the three resistors, R1, is connected to the drain of one of the two transistors, Q3, and the gate of the other of the two transistors, Q1; the source of one of the two transistors, Q3, is connected to reference ground GND1; the other end of the third of the three resistors, R1, is connected to the source of the other of the two transistors, Q1; and the drain of the other of the two transistors, Q1, is connected to diode D8. The control circuit, excluding the first control circuit described above, includes: two resistors, a transistor (Q2, Q4, Q5, ...), and a shunt diode (D5, D6, D7, ...). One of the two resistors (e.g., R4) is connected to the gate of the transistor (e.g., Q2) and the secondary side of the previous optocoupler (e.g., DU1). The other resistor (e.g., R5) is connected to the gate of the transistor (e.g., Q2) and a reference ground (e.g., GND2). The drain of the transistor (e.g., Q2) is connected to the secondary side of the optocoupler (e.g., DU2). The shunt diode (e.g., D5) is connected to the source of the transistor (e.g., Q2) and the primary side of the corresponding optocoupler (e.g., DU2). One of the two transistors is a PMOS transistor, and the other is an NMOS transistor. The control signals include a high output signal and a low output signal.

[0026] by Figure 2 For the object of explanation:

[0027] ① When the product is powered on, the transformer windings are rectified by rectifier diodes D, D1, D2, and D3 respectively, and then obtain voltages VCC1, VCC2, VCC3, and VCC4 through capacitors C1, C2, C3, and C4 respectively. After passing through control circuit 1, control circuit 2, control circuit 3, and control circuit 4 respectively, the voltages VDD1, VDD2, VDD3, and VDD4 are output to power circuit 1, circuit 2, circuit 3, and circuit 4 respectively. When the product is not in standby mode, signal PW = 1 (output high); when the product is in standby mode, signal PW = 0 (output low).

[0028] When the product is not in standby mode, signal PW can also be 0 (output low); when the product is in standby mode, signal PW can also be 1 (output high). This can be achieved by simply replacing Q3 with a P-tube.

[0029] ②

[0030] 1) When the product is not in standby mode, the microcontroller outputs a high signal PW. PW flows through R3 to the gate of Q3, turning Q3 on. The gate of Q2 is low, turning Q2 on. Voltage VCC1, through Q1 and D8, outputs VDD1, supplying power to circuit 1 (reference ground GND1). PW also flows through R2 to the primary side of optocoupler DU1 and then to GND1. The secondary side of DU1 is on. VCC2, through the secondary side of DU1, is divided by R4 and R5 and then flows to the gate of Q2. Q2 is on, and VCC2, through Q2 and D5, outputs VDD2, supplying power to circuit 2 (reference ground GND2). At this time, VDD2, through the optocoupler... The primary side of DU2 then flows through R7 to GND2, turning on the secondary side of optocoupler DU2. VCC3 flows through the secondary side of DU2, then through R6 and R8, and finally through the voltage divider to the gate of Q4. At this time, Q4 is turned on, and the voltage VCC3, through Q4 and through D6, outputs VDD3, which supplies power to circuit 3, whose reference ground is GND3. At this time, VDD3 flows through the primary side of optocoupler DU3, then through R11 to GND3, turning on the secondary side of optocoupler DU3. VCC4 flows through the secondary side of DU3, then through R9 and R10, and finally through the voltage divider to the gate of Q5. At this time, Q5 is turned on, and the voltage VCC4, through Q5 and through D7, outputs VDD4, which supplies power to circuit 4, whose reference ground is GND4.

[0031] 2) When the product is in standby mode, the microcontroller's PW signal output is low. PW flows through R3 to the gate of Q3. With Q3's gate low, Q3 is not conducting. VCC1 flows through R1 to the gate of Q1. With Q1's gate high, Q1 is not conducting, and VCC1 cannot supply power to circuit 1, whose reference ground is GND1. PW also flows through R2 to the primary side of optocoupler DU1 to GND1. Since PW is low, no current flows through DU1's primary side, and DU1's secondary side is not conducting. With Q2's gate low, Q2 is not conducting, and VCC2 cannot supply power to circuit 1, whose reference ground is GND1. Circuit 2 is powered by ND2; when VDD2 is low, no current flows through the primary side of DU2, the secondary side of DU2 is not conducting, the gate of Q4 is low, Q4 is not conducting, and VCC3 cannot supply power to circuit 3, which has GND3 as its reference ground; when VDD3 is low, no current flows through the primary side of DU3, the secondary side of DU3 is not conducting, the gate of Q5 is low, Q5 is not conducting, and VCC4 cannot supply power to circuit 4, which has GND4 as its reference ground; thus, in standby mode, the power supply voltage of circuits 1, 2, 3, and 4 is cut off, achieving low power consumption or even zero power consumption;

[0032] This invention can control the voltages of one, two, three, ... or N different reference grounds in a coordinated manner. The specific implementation of the coordinated control can be deduced from the above.

[0033] The advantages of this invention are that using this circuit, one signal can control one, two, three, ... or N power supply voltage loops with different reference grounds, and it can achieve minimum low power consumption or even zero power consumption in standby mode. Its circuit connection is simple, the number of components is small, the cost is low, and the performance is stable.

[0034] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from the others. Similar or identical parts between embodiments can be referred to interchangeably.

[0035] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A standby circuit for linkage control of different reference grounds, characterized in that, include: The circuit consists of a microcontroller, multiple rectifier circuits, control circuits, and optocouplers. Each of the rectifier circuits is disposed on one side of the transformer winding. Each rectifier circuit is connected to a corresponding control circuit. The rectifier circuit is used to rectify the current supplied by the transformer winding and obtain a rectified voltage based on the rectified circuit. Each control circuit is connected to a corresponding reference ground circuit, and the control circuits are connected sequentially through the optocoupler. The control circuit is used to obtain a supply voltage based on the rectified voltage and send the supply voltage to the corresponding reference ground circuit. The microcontroller circuit is connected to the first control circuit. The microcontroller circuit is used to send control signals to the control circuit to achieve power supply control of the reference ground circuit. The first control circuit includes: three resistors, two transistors, and one diode; One of the three resistors is connected to the microcontroller circuit and the primary side of the corresponding optocoupler; another of the three resistors is connected to the microcontroller circuit and the gate of one of the two transistors; one end of the third of the three resistors is connected to the drain of one of the two transistors and the gate of the other of the two transistors; the source of one of the two transistors is connected to reference ground; the other end of the third of the three resistors is connected to the source of the other of the two transistors; the drain of the other of the two transistors is connected to a diode. The control circuit, excluding the first control circuit, includes: two resistors, a transistor, and a shunt diode; One of the two resistors is connected to the gate of the transistor and the secondary side of the previous optocoupler, respectively; the other of the two resistors is connected to the gate of the transistor and reference ground, respectively; the drain of the transistor is connected to the secondary side of one of the optocouplers; the shunt diodes are connected to the source of the transistor and the primary side of the corresponding optocoupler, respectively.

2. The standby circuit for linkage control of different reference grounds according to claim 1, characterized in that, The rectifier circuit includes: rectifier diodes and capacitors; One end of the rectifier tube is connected to one end of the transformer winding; the other end of the rectifier tube is connected to one end of the capacitor; the other end of the capacitor is connected to the reference ground circuit and the other end of the transformer winding, respectively.

3. The standby circuit for linkage control of different reference grounds according to claim 1, characterized in that, One of the two transistors is a PMOS transistor, and the other is an NMOS transistor.

4. The standby circuit for linkage control of different reference grounds according to claim 1, characterized in that, The control signals include high output signals and low output signals.

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