Auxiliary power supply isolation control circuit for multipath startup and shutdown and auxiliary power supply

Abstract

The utility model relates to the technical field of power supply circuits, and discloses an auxiliary power supply isolation control circuit and an auxiliary power supply for multi-path startup and shutdown. The circuit comprises a first control unit and a second control unit. The first control unit comprises an input voltage source, a first optocoupler, a first resistor, a second resistor and a control chip. The first optocoupler comprises a first optocoupler diode and a first optocoupler triode; and the cathode of the first optocoupler diode is connected with the second control unit and is used for receiving a level signal output by the second control unit. The first end of the first resistor is connected with the first end of the input voltage source, and the second end of the first resistor is connected with the anode of the first optocoupler diode. The first end of the second resistor is connected with the second end of the input voltage source, and the second end of the second resistor is connected with the collector of the first optocoupler triode. The control chip is connected with the emitter of the first optocoupler triode. Wherein when the level signal is input to the first control unit, the auxiliary power supply is started; and when the second control unit has no output, the auxiliary power supply is shut down.

Description

Technical Field

[0001] This disclosure relates to the field of power supply circuit technology, and in particular to an auxiliary power supply isolation control circuit and an auxiliary power supply for multi-channel switching. Background Technology

[0002] Auxiliary power supplies provide a stable low voltage to the control and drive circuits in power supplies, ensuring their stable operation. An auxiliary power supply includes a control unit, power unit, input, and output; the control unit includes a control chip, peripheral circuits, and control switching devices. Currently, powering on the auxiliary power supply requires the input voltage to be transmitted to the power supply pin of the control chip via a voltage divider resistor. Once the voltage level on the power supply pin reaches the control chip's power-on threshold, the control unit begins operation, thus enabling the auxiliary power supply to power on and output.

[0003] Currently, traditional auxiliary power supplies rely on the input voltage being transmitted to the control chip via a voltage divider resistor. As long as there is an input voltage, the control chip's power supply pins will generate voltage, thus powering on and outputting power to the auxiliary power supply. However, this results in the output voltage generated by the auxiliary power supply at specific times being uncontrollable, leading to unnecessary power consumption by the control chip and consequently affecting the overall power system's energy consumption.

[0004] Therefore, existing technologies still need improvement. Utility Model Content

[0005] To address the shortcomings of existing technologies, this disclosure provides an auxiliary power supply isolation control circuit and an auxiliary power supply for multi-channel switching, aiming to solve the technical problem in related technologies where the output voltage generated by the auxiliary power supply at a specific moment is difficult to control precisely, resulting in unnecessary power consumption of the top control chip.

[0006] The technical solution adopted by this disclosure to solve the above-mentioned technical problems is as follows:

[0007] This disclosure provides an auxiliary power isolation control circuit for multiple-way power on / off, including a first control unit and a second control unit. The first control unit includes:

[0008] Input voltage source;

[0009] The first optocoupler includes a first optocoupler diode and a first optocoupler transistor; the cathode of the first optocoupler diode is connected to the second control unit and is used to receive the level signal output by the second control unit.

[0010] A first resistor; the first end of the first resistor is connected to the first end of the input voltage source, and the second end of the first resistor is connected to the anode of the first optocoupler diode;

[0011] A second resistor; the first end of the second resistor is connected to the second end of the input voltage source, and the second end of the second resistor is connected to the collector of the first optocoupler transistor; and

[0012] The control chip is connected to the emitter of the first optocoupler transistor;

[0013] Specifically, when the second control unit outputs the level signal to the first control unit, the auxiliary power supply corresponding to the auxiliary power isolation control circuit is turned on; when the second control unit has no output, the auxiliary power supply is turned off.

[0014] In some embodiments, the input to the second control unit is an enable signal output by the comparator;

[0015] Wherein, if the preset initial voltage of the comparator is greater than the input voltage of the input voltage source, the enable signal is a low-level signal, and the second control unit has no output; if the initial voltage is less than the input voltage, the enable signal is a high-level signal, and the second control unit outputs the high-level signal to the first control unit; or

[0016] If the initial voltage is less than the input voltage, the enable signal is a low-level signal, and the second control unit has no output; if the initial voltage is greater than the input voltage, the enable signal is a high-level signal, and the second control unit outputs the high-level signal to the first control unit.

[0017] In some embodiments, the input to the second control unit is an enable signal, and the enable signal is a time-continuous level signal;

[0018] If the enable signal is a low-level signal, the second control unit has no output; if the enable signal is a high-level signal, the second control unit outputs the high-level signal to the first control unit.

[0019] In some embodiments, the second control unit includes:

[0020] A third resistor; the first end of the third resistor is used to receive a first enable signal;

[0021] A first diode; the first terminal of the first diode is connected to the second terminal of the third resistor;

[0022] A transistor; the base of the transistor is connected to the second terminal of the first diode, and the emitter of the transistor is grounded; and

[0023] The second optocoupler includes a second optocoupler diode and a second optocoupler transistor; the cathode of the second optocoupler diode is connected to the collector of the transistor, the anode of the second optocoupler diode is used to receive voltage, the emitter of the second optocoupler transistor is grounded, and the collector of the second optocoupler transistor is used to output the level signal.

[0024] If the first enable signal is a low-level signal, the second control unit has no output; if the first enable signal is a high-level signal, the second control unit outputs the level signal to the first control unit.

[0025] In some embodiments, the second control unit includes:

[0026] A third resistor; the first end of the third resistor is used to receive a first enable signal;

[0027] A first diode; the first terminal of the first diode is connected to the second terminal of the third resistor;

[0028] A fourth resistor; the first terminal of the fourth resistor is used to receive a second enable signal;

[0029] The second diode; the first end of the second diode is connected to the second end of the fourth resistor;

[0030] A transistor; the base of the transistor is connected to the second terminal of the first diode and the second terminal of the second diode, and the emitter of the transistor is grounded; and

[0031] The second optocoupler includes a second optocoupler diode and a second optocoupler transistor; the cathode of the second optocoupler diode is connected to the collector of the transistor, the anode of the second optocoupler diode is used to receive voltage, the emitter of the second optocoupler transistor is grounded, and the collector of the second optocoupler transistor is used to output the level signal.

[0032] Wherein, if the first enable signal and the second enable signal are low level signals, the second control unit has no output; if the first enable signal and / or the second enable signal are high level signals, the second control unit outputs the level signal to the first control unit.

[0033] In some embodiments, the second control unit further includes:

[0034] The fifth resistor; the first end of the fifth resistor is connected to the base of the transistor, and the second end of the fifth resistor is grounded.

[0035] In some embodiments, the second control unit further includes:

[0036] A sixth resistor; the first end of the sixth resistor is connected to the anode of the second optocoupler diode, and the second end of the sixth resistor is used to receive the voltage; and

[0037] The seventh resistor is connected to the collector of the second optocoupler transistor, and the second end of the seventh resistor is connected to the cathode of the first optocoupler diode, for outputting the level signal.

[0038] In some embodiments, the first control unit further includes:

[0039] A capacitor; the first end of the capacitor is connected to the emitter of the first optocoupler transistor, and the second end of the capacitor is grounded.

[0040] In some embodiments, the first control unit further includes:

[0041] A Zener diode is connected in parallel with the capacitor; the first end of the Zener diode is connected to the emitter of the first optocoupler transistor, and the second end of the Zener diode is grounded.

[0042] In addition, this disclosure also provides an auxiliary power supply for multiple-way switching, including the aforementioned auxiliary power supply isolation control circuit for multiple-way switching.

[0043] Beneficial effects: This disclosure controls the first control unit by controlling the level signal output by the second control unit, thereby controlling the power supply to the auxiliary power supply control chip. The control chip then controls the power circuit to achieve precise output of the auxiliary power supply. Therefore, in applications where the power system has high power consumption requirements (e.g., standby power consumption), the multi-channel power-on / off auxiliary power supply isolation control circuit provided by this disclosure connects the first and second control units to achieve precise control of the auxiliary power supply's power-on and power-off using the level signal output by the second control unit. This allows the power consumption generated by the auxiliary power supply to be saved by shutting down the entire auxiliary power supply. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0045] Figure 1 This is a schematic diagram of the circuit structure of an auxiliary power isolation control circuit for multiple-way power on / off provided in some embodiments of this disclosure.

[0046] Figure 2This is a schematic diagram of the circuit structure of a second control unit of an auxiliary power isolation control circuit for multiple-way power on / off provided in some embodiments of this disclosure.

[0047] Figure 3 This is a schematic diagram of another circuit structure of the second control unit of an auxiliary power isolation control circuit for multiple-way power on / off provided in some embodiments of this disclosure. Detailed Implementation

[0048] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “the,” “the,” “as described,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this disclosure means the presence of the stated features, integers, steps, operations, elements, and / or modules, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, modules, and / or groups thereof. It will be understood that when an element is referred to as “connected” or “coupled” to another element, it may be directly connected or coupled to the other element, or there may be intermediate elements present. Furthermore, “connected” or “coupled” as used herein may include wireless connections or wireless coupling. The term “and / or” as used herein includes all or any units and all combinations of one or more associated listed items.

[0049] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have a meaning consistent with their meaning in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0050] Please see Figure 1 This disclosure provides an auxiliary power isolation control circuit for multiple-way switching, including: a first control unit and a second control unit; the level signal of the second control unit is output to the first control unit. The first control unit includes: an input voltage source Uin, a first optocoupler U1, a first resistor R1, a second resistor R2, and a control chip IC1. The input voltage source Uin is used to provide the input voltage. The first terminal of the input voltage source Uin is connected to the first terminal of the first resistor R1, and the second terminal of the input voltage source Uin is connected to the first terminal of the second resistor R2, that is, the first resistor R1 and the second resistor R2 are connected in series. The first optocoupler U1 includes a first optocoupler diode A1 on the primary side and a first optocoupler transistor B1 on the secondary side. The cathode of the first optocoupler diode A1 (e.g., Figure 1 As shown in Figure 2), it connects to the second control unit and is used to receive the level signal output by the second control unit; the anode of the first optocoupler diode A1 (as shown in Figure 2) is connected to the second control unit. Figure 1 As shown in Figure 1), the second terminal of the first resistor R1 is connected. The collector of the first optocoupler transistor B1 (as shown in Figure 1) is connected to... Figure 1 As shown in Figure 4), the second terminal of the second resistor R2 is connected to the emitter of the first optocoupler transistor B1 (as shown in Figure 4). Figure 1 As shown in Figure 3), the power supply pin of the control chip IC1 is connected. When the second control unit outputs a level signal to the first control unit, the auxiliary power supply corresponding to the auxiliary power isolation control circuit is turned on; when the second control unit has no output, the auxiliary power supply is turned off.

[0051] When the first optocoupler diode A1 on the primary side of the first optocoupler U1 receives a low-level signal output from the second control unit, the first optocoupler diode A1 conducts, and the first resistor R1 provides the conduction current for the first optocoupler diode A1. After the first optocoupler transistor B1 on the secondary side of the first optocoupler U1 conducts along with the first optocoupler diode A1, the collector and emitter of the first optocoupler transistor B1 are connected (i.e., Figure 1 (Points 4 and 3 are equivalent to the same point). The input voltage of the input voltage source Uin is transmitted to the control chip IC1 through the second resistor R2 and the first optocoupler transistor B1 to charge the power supply pin of the control chip IC1. When the level value of the power supply pin of the control chip IC1 reaches the preset level threshold of the control chip IC1, the auxiliary power supply is turned on and output. When the first optocoupler diode A1 on the primary side of the first optocoupler U1 does not receive a level signal from the output of the second control unit, the first optocoupler U1 is disconnected, thereby turning off the auxiliary power supply and preventing it from being turned on.

[0052] The auxiliary power supply isolation control circuit for multiple-way switching provided in this disclosure includes a first control unit and a second control unit. The first optocoupler of the first control unit is located between the input voltage source of the auxiliary power supply and the power supply pin of the control chip. A low-level signal output by the second control unit is input to the first optocoupler diode on the primary side of the first optocoupler. Therefore, by controlling the level signal input to the first optocoupler diode on the primary side of the first optocoupler, the switching on and off of the first optocoupler transistor on the secondary side of the first optocoupler can be further controlled. The input voltage passes sequentially through a second voltage divider resistor and the first optocoupler transistor to the power supply pin of the control chip. Therefore, by controlling the switching on and off of the first optocoupler transistor, the level value of the power supply pin of the control chip can be achieved. In other words, this disclosure controls the first control unit by controlling the level signal output by the second control unit, thereby controlling the power supply to the control chip of the auxiliary power supply. The control chip then achieves precise output of the auxiliary power supply by controlling the power circuit. Therefore, in applications where the power supply system has high requirements for power consumption (e.g., the standby power consumption of the power supply system), the auxiliary power supply isolation control circuit for multiple-way power on / off provided in this disclosure connects two first control units and second control units to achieve precise control of the auxiliary power supply's power on and off using the level signal output by the second control unit. This allows the power consumption generated by the auxiliary power supply to be saved by shutting down the entire auxiliary power supply, thereby significantly reducing the standby power consumption of the power supply system.

[0053] In some embodiments, please continue reading Figure 1 The first control unit also includes a capacitor C1. The first terminal of capacitor C1 is connected to the emitter of the first optocoupler transistor B1, and the second terminal of capacitor C1 is grounded. The input voltage of the input voltage source Uin is input to the control chip IC1 through the second resistor R2 and the first optocoupler transistor B1, charging both the power supply pin of the control chip IC1 and capacitor C1. Capacitor C1 serves to ensure the stable operation of the control chip IC1.

[0054] In one implementation of this embodiment, please continue reading. Figure 1 The first control unit also includes a Zener diode D3 connected in parallel with capacitor C1. The first end of Zener diode D3 is connected to the emitter of the first optocoupler transistor B1, and the second end of Zener diode D3 is grounded. Zener diode D3 serves to limit the voltage level of the power supply pin of control chip IC1, preventing the control chip from being damaged by excessively high voltage levels.

[0055] In some embodiments, the enable signal input to the second control unit is a time-dependent level signal. If the enable signal is low, the second control unit is off, and it does not output a level signal to the first control unit, thus the auxiliary power supply is off and cannot be turned on. If the enable signal is high, the second control unit is on, and it outputs a low-level signal to the first control unit, thus the auxiliary power supply is on. Therefore, the on / off state of the auxiliary power supply can be controlled by adjusting the level of the enable signal input to the second control unit at any given time, achieving precise control over the on / off state of the auxiliary power supply.

[0056] In some embodiments, the enable signal input to the second control unit is the output of a comparator, and the initial voltage of the comparator can be preset. Specifically, if the initial voltage is greater than the input voltage of the input voltage source (in which case the input voltage source is in an undervoltage state), the enable signal is low, the second control unit is disconnected, and it does not output a level signal to the first control unit, thus the auxiliary power supply is powered off and cannot be powered on, thereby achieving undervoltage protection for the auxiliary power supply. If the initial voltage is less than the input voltage, the enable signal is high, the second control unit is turned on, and it outputs a low-level signal to the first control unit, thus powering on the auxiliary power supply. Alternatively, if the initial voltage is less than the input voltage (in which case the input voltage source is in an overvoltage state), the enable signal is low, the second control unit is disconnected, and it does not output a level signal to the first control unit, thus powering off the auxiliary power supply and preventing it from powering on. If the initial voltage is greater than the input voltage, the enable signal is high, the second control unit is turned on, and it outputs a low-level signal to the first control unit, thus powering on the auxiliary power supply, thereby achieving overvoltage protection for the auxiliary power supply. This embodiment achieves over- and under-voltage protection for the entire auxiliary power supply by setting the input of the second control unit to the output of the comparator. This avoids the problem of the auxiliary power supply output hiccups caused by repeated fluctuations of the voltage of the power supply pin of the control chip near the threshold voltage due to the input voltage being too low, and also avoids the problem of over-voltage damage to the internal components of the auxiliary power supply caused by the input voltage being too high.

[0057] In some embodiments, the enable signal input to the second control unit can be a single enable signal. See also... Figure 2 The second control unit includes: a third resistor R3, a first diode D1, a transistor Q1, and a second optocoupler U2. The first terminal of the third resistor R3 receives a first enable signal EN1 (which can be a level signal), and the second terminal of the third resistor R3 is connected to the first terminal of the first diode D1. The second terminal of the first diode D1 is connected to the base of the transistor Q1 (e.g., ...). Figure 2 As shown in 11), the third resistor R3 provides current to transistor Q1. The emitter of transistor Q1 (as shown in 11) Figure 2As shown in 12), it is grounded. The second optocoupler U2 includes a second optocoupler diode A2 on the primary side and a second optocoupler transistor B2 on the secondary side. The cathode of the second optocoupler diode A2 (as shown in 12) is grounded. Figure 2 As shown in 22), the collector of transistor Q1 is connected (e.g.) Figure 2 As shown in 13), the anode of the second optocoupler diode A2 (as shown in 13) Figure 2 The 21 shown is used to receive the input voltage (which can be 3.3V). The emitter of the second optocoupler transistor B2 (as shown) Figure 2 As shown in Figure 23), the collector of the second optocoupler transistor B2 is grounded (e.g., ...). Figure 2 As shown in Figure 24), the output level signal is used to the first control unit, that is, the output of the second optocoupler transistor B2 is the output of the second control unit.

[0058] When the first enable signal input to the second control unit is a high-level signal, transistor Q1 is turned on. Since the emitter of transistor Q1 is grounded, after transistor Q1 is turned on, the cathode of the second optocoupler diode A2 on the primary side of the second optocoupler U2 is simultaneously grounded, and the second optocoupler transistor B2 on the secondary side of the second optocoupler U2 is simultaneously turned on. Since the collector of the second optocoupler transistor B2 is grounded, the second control unit outputs a low-level signal to the cathode of the first optocoupler diode A1 on the primary side of the first optocoupler U1 of the first control unit, and the first optocoupler U1 is turned on. The auxiliary power supply input voltage on the secondary side of the first optocoupler U1 is input to the power supply pin of the control chip IC1 through the second resistor R2. At this time, the power supply voltage (Voltage Common Collector, VCC) of the power supply pin of the control chip IC1 is generated, and the auxiliary power supply generates an output, thereby realizing the control of the first control unit to control the power-on of the entire auxiliary power supply through the enable signal of the second control unit. When the first enable signal input to the second control unit is a low level signal or no level, transistor Q1 is disconnected and not conducting, and the second optocoupler U2 is disconnected and not conducting. At this time, the secondary side of the first optocoupler U1 is also in a non-conducting state, the auxiliary power supply is turned off and cannot be turned on, thus realizing the shutdown of the entire auxiliary power supply by controlling the first control unit through the enable signal of the second control unit.

[0059] In another implementation of this embodiment, the enable signal input to the second control unit can be a multiplexed enable signal. Please refer to [link / reference]. Figure 3 Taking two enable signals as an example, the second control unit includes: a third resistor R3, a first diode D1, a fourth resistor R4, a second diode D2, a transistor Q1, and a second optocoupler U2. The first terminal of the third resistor R3 is used to receive the first enable signal EN1 (which can be a level signal), and the second terminal of the third resistor R3 is connected to the first terminal of the first diode D1. The second terminal of the first diode D1 is connected to the base of the transistor Q1 (e.g., ...). Figure 3As shown in Figure 31), the third resistor R3 provides current to transistor Q1. The first terminal of the fourth resistor R4 is used to receive the second enable signal EN2 (which can be a level signal), and the second terminal of the fourth resistor R4 is connected to the first terminal of the second diode D2. The second terminal of the second diode D2 is connected to the base of transistor Q1, so the fourth resistor R4 also provides current to transistor Q1. The two enable signals are connected to the base of transistor Q1 simultaneously through the third resistor R3, the first diode D1, and the fourth resistor R4, the second diode D2; wherein, the first diode D1 and the second diode D2 act as anti-reverse resistors to avoid mutual interference between the first enable signal and the second enable signal. The emitter of transistor Q1 (e.g., Figure 3 As shown in Figure 32), it is grounded. The second optocoupler U2 includes a second optocoupler diode A2 on the primary side and a second optocoupler transistor B2 on the secondary side. The cathode of the second optocoupler diode A2 (e.g., Figure 3 As shown in 42), the collector of transistor Q1 is connected (e.g.) Figure 3 As shown in 33), the anode of the second optocoupler diode A2 (as shown in 33) Figure 3 The 41 shown is used to receive the input voltage (which can be 3.3V). The emitter of the second optocoupler transistor B2 (e.g.) Figure 3 As shown in Figure 43), the collector of the second optocoupler transistor B2 is grounded (e.g., ...). Figure 3 As shown in 44), the output level signal is used to the first control unit, that is, the output of the second optocoupler transistor B2 is the output of the second control unit.

[0060] When the first enable signal and / or the second enable signal are high-level signals, the base of transistor Q1 is at a high level, and the collector and emitter of transistor Q1 are equivalent to the same point, that is, transistor Q1 is turned on. Since the emitter of transistor Q1 is grounded, the collector of transistor Q1 is also grounded at this time, that is, the second optocoupler diode A2 on the primary side of the second optocoupler U2 is turned on, and thus the second optocoupler transistor B2 on the secondary side of the second optocoupler U2 is turned on. Since the emitter of the second optocoupler transistor B2 is grounded, the collector of the second optocoupler transistor B2 is equivalent to being directly grounded. Therefore, after the second optocoupler transistor B2 is turned on, the level signal output from the collector of the second optocoupler transistor B2 is a low-level signal. The low-level signal is input to the first control unit, and the auxiliary power supply is turned on. When the first and second enable signals are low or absent, the entire second control unit is inactive, and the first control unit does not undergo any circuit configuration changes. The auxiliary power supply's input voltage cannot supply power to the control chip's power pins, allowing the auxiliary power supply to output normally and enabling its shutdown process. Furthermore, the auxiliary power supply cannot be turned on after shutdown. This embodiment uses multiple enable signals, allowing each different enable signal to control the auxiliary power supply's startup. Moreover, the second optocoupler U2, as an opto-isolator, can control the entire auxiliary power supply's startup and shutdown using the enable signal of the second control unit while ensuring safety, achieving isolation while significantly improving product safety performance.

[0061] In some embodiments, please refer to Figure 2 and Figure 3 To provide conduction current to the second optocoupler diode A2, a sixth resistor R6 can be provided. The first end of the sixth resistor R6 is connected to the anode of the second optocoupler diode A2, and the second end is used to receive the input voltage. Thus, the input voltage passes through the sixth resistor R6 to the second optocoupler diode A2, facilitating the conduction of the second optocoupler U2. Additionally, to provide conduction current to the first optocoupler diode A1 in the first control unit, a seventh resistor R7 can be provided. The first end of the seventh resistor R7 is connected to the collector of the second optocoupler transistor B2, and the second end is connected to the cathode of the first optocoupler diode A1 in the first control unit. Thus, the level signal output from the second optocoupler transistor B2 passes through the seventh resistor R7 to the first optocoupler diode A1, facilitating the conduction of the first optocoupler U1.

[0062] In some embodiments, please refer to Figure 2 and Figure 3 The second control unit also includes a fifth resistor R5. The first terminal of the fifth resistor R5 is connected to the base of transistor Q1, and the second terminal of the fifth resistor R5 is grounded. The fifth resistor R5 provides a discharge path for the base of transistor Q1, preventing false turn-on of transistor Q1.

[0063] In addition, this disclosure also provides an auxiliary power supply for multiple-way switching, including the aforementioned auxiliary power supply isolation control circuit for multiple-way switching.

[0064] It is understood that the terms “length,” “width,” “height,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “side,” “bottom,” “inner,” and “outer” used in this disclosure to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of description and simplification, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this disclosure.

[0065] It is understood that the terms "first" and "second" in this disclosure are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, "a plurality of" means two or more, unless otherwise explicitly specified.

[0066] It is understood that, unless otherwise expressly specified and limited, the terms "set," "install," "connect," "link," and "fix" in this disclosure should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0067] The embodiments described above are for illustrative purposes only and are not intended to limit the scope of this disclosure. Any modifications or variations made without departing from the spirit of this disclosure are within the scope of protection of this disclosure.

Claims

1. An auxiliary power supply isolation control circuit for multiple-channel switching, characterized in that, It includes a first control unit and a second control unit, wherein the first control unit includes: Input voltage source; The first optocoupler includes a first optocoupler diode and a first optocoupler transistor; the cathode of the first optocoupler diode is connected to the second control unit and is used to receive the level signal output by the second control unit. A first resistor; the first end of the first resistor is connected to the first end of the input voltage source, and the second end of the first resistor is connected to the anode of the first optocoupler diode; A second resistor; the first end of the second resistor is connected to the second end of the input voltage source, and the second end of the second resistor is connected to the collector of the first optocoupler transistor; and The control chip is connected to the emitter of the first optocoupler transistor; Specifically, when the second control unit outputs the level signal to the first control unit, the auxiliary power supply corresponding to the auxiliary power isolation control circuit is turned on; when the second control unit has no output, the auxiliary power supply is turned off.

2. The auxiliary power isolation control circuit for multi-channel switching as described in claim 1, characterized in that, The input to the second control unit is the enable signal output by the comparator; Wherein, if the preset initial voltage of the comparator is greater than the input voltage of the input voltage source, the enable signal is a low-level signal, and the second control unit has no output; if the initial voltage is less than the input voltage, the enable signal is a high-level signal, and the second control unit outputs the high-level signal to the first control unit; or If the initial voltage is less than the input voltage, the enable signal is a low-level signal, and the second control unit has no output; if the initial voltage is greater than the input voltage, the enable signal is a high-level signal, and the second control unit outputs the high-level signal to the first control unit.

3. The auxiliary power supply isolation control circuit for multi-channel switching as described in claim 1, characterized in that, The input to the second control unit is an enable signal, and the enable signal is a level signal that is continuous over time; If the enable signal is a low-level signal, the second control unit has no output; if the enable signal is a high-level signal, the second control unit outputs the high-level signal to the first control unit.

4. The auxiliary power isolation control circuit for multi-channel switching as described in claim 1, characterized in that, The second control unit includes: A third resistor; the first end of the third resistor is used to receive a first enable signal; A first diode; the first terminal of the first diode is connected to the second terminal of the third resistor; A transistor; the base of the transistor is connected to the second terminal of the first diode, and the emitter of the transistor is grounded; and The second optocoupler includes a second optocoupler diode and a second optocoupler transistor; the cathode of the second optocoupler diode is connected to the collector of the transistor, the anode of the second optocoupler diode is used to receive voltage, the emitter of the second optocoupler transistor is grounded, and the collector of the second optocoupler transistor is used to output the level signal. If the first enable signal is a low-level signal, the second control unit has no output; if the first enable signal is a high-level signal, the second control unit outputs the level signal to the first control unit.

5. The auxiliary power supply isolation control circuit for multi-channel switching as described in claim 1, characterized in that, The second control unit includes: A third resistor; the first end of the third resistor is used to receive a first enable signal; A first diode; the first terminal of the first diode is connected to the second terminal of the third resistor; A fourth resistor; the first terminal of the fourth resistor is used to receive a second enable signal; The second diode; the first end of the second diode is connected to the second end of the fourth resistor; A transistor; the base of the transistor is connected to the second terminal of the first diode and the second terminal of the second diode, and the emitter of the transistor is grounded; and The second optocoupler includes a second optocoupler diode and a second optocoupler transistor; the cathode of the second optocoupler diode is connected to the collector of the transistor, the anode of the second optocoupler diode is used to receive voltage, the emitter of the second optocoupler transistor is grounded, and the collector of the second optocoupler transistor is used to output the level signal. Wherein, if the first enable signal and the second enable signal are low level signals, the second control unit has no output; if the first enable signal and / or the second enable signal are high level signals, the second control unit outputs the level signal to the first control unit.

6. The auxiliary power supply isolation control circuit for multi-channel switching as described in claim 4 or 5, characterized in that, The second control unit also includes: The fifth resistor; the first end of the fifth resistor is connected to the base of the transistor, and the second end of the fifth resistor is grounded.

7. The auxiliary power supply isolation control circuit for multi-channel switching as described in claim 4 or 5, characterized in that, The second control unit also includes: A sixth resistor; the first end of the sixth resistor is connected to the anode of the second optocoupler diode, and the second end of the sixth resistor is used to receive the voltage; and The seventh resistor is connected to the collector of the second optocoupler transistor, and the second end of the seventh resistor is connected to the cathode of the first optocoupler diode, for outputting the level signal.

8. The auxiliary power supply isolation control circuit for multi-channel switching as described in claim 1, characterized in that, The first control unit also includes: A capacitor; the first end of the capacitor is connected to the emitter of the first optocoupler transistor, and the second end of the capacitor is grounded.

9. The auxiliary power supply isolation control circuit for multi-channel switching as described in claim 8, characterized in that, The first control unit also includes: A Zener diode is connected in parallel with the capacitor; the first end of the Zener diode is connected to the emitter of the first optocoupler transistor, and the second end of the Zener diode is grounded.

10. An auxiliary power supply for multi-channel switching, characterized in that, Includes the auxiliary power isolation control circuit for multiple-way switching as described in any one of claims 1-9.

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