CN221227367U - BUCK output adjustable circuit suitable for isolating given PWM - Google Patents
BUCK output adjustable circuit suitable for isolating given PWM Download PDFInfo
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- CN221227367U CN221227367U CN202323120161.8U CN202323120161U CN221227367U CN 221227367 U CN221227367 U CN 221227367U CN 202323120161 U CN202323120161 U CN 202323120161U CN 221227367 U CN221227367 U CN 221227367U
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Abstract
The utility model provides a BUCK output adjustable circuit suitable for isolating given PWM, which is characterized in that: the device comprises a control module, an isolation feedback module, a driving module and a BUCK output module; the control module comprises a singlechip; the isolation feedback module comprises a voltage following sub-circuit, an isolation given sub-circuit, an amplifying sub-circuit, a voltage negative feedback regulating sub-circuit and an optocoupler isolation sub-circuit which are connected in sequence; the voltage follower sub-circuit is connected with the singlechip; the driving module comprises an MOS tube driving sub-circuit; the BUCK output module comprises a BUCK sub-circuit, and the low side of the BUCK sub-circuit is connected with the MOS tube driving sub-circuit so as to realize output control of the BUCK output module. The BUCK output adjustable circuit suitable for isolating given PWM has good stability and strong anti-interference capability, and can be used for realizing adjustment of output voltage of the BUCK circuit.
Description
Technical Field
The utility model belongs to the technical field of circuits, and particularly relates to a BUCK output adjustable circuit suitable for isolating given PWM.
Background
The Buck circuit, also called Buck circuit, is characterized in that the output voltage is lower than the input voltage, the input current is pulsed, the output current is continuous, the Buck task can be well completed for some conventional use cases, and the Buck circuit is high in efficiency, but if Buck is on the primary side, secondary side is needed to assist in regulating output setting, and meanwhile, under the condition that wider output conditions are needed, the Buck circuit is inconvenient to realize.
Disclosure of utility model
In view of the foregoing, the present utility model aims to provide a BUCK output adjustable circuit suitable for isolating a given PWM, so as to solve the problem that the given output adjustment is inconvenient when the existing BUCK circuit is on the primary side.
In order to achieve the above purpose, the technical scheme of the utility model is realized as follows:
A BUCK output adjustable circuit suitable for isolating given PWM comprises a control module, an isolation feedback module, a driving module and a BUCK output module;
The control module comprises a singlechip;
The isolation feedback module comprises a voltage following sub-circuit, an isolation given sub-circuit, an amplifying sub-circuit, a voltage negative feedback regulating sub-circuit and an optocoupler isolation sub-circuit which are connected in sequence; the voltage follower sub-circuit is connected with the singlechip to receive a given VDA signal output by the singlechip;
The driving module comprises an MOS tube driving sub-circuit, and the control end of the MOS tube driving sub-circuit is connected with the output end of the optocoupler isolation sub-circuit through a switching power supply so as to realize that the control module controls the driving module through the isolation feedback module;
The BUCK output module comprises a BUCK sub-circuit, and the low side of the BUCK sub-circuit is connected with the MOS tube driving sub-circuit so as to realize output control of the BUCK output module.
Further, the voltage follower sub-circuit includes a resistor R5139, an operational amplifier U5107, a resistor R5105, a resistor R5100, and a capacitor C5117;
One end of the resistor R5139 is connected with the non-inverting input end of the operational amplifier U5107, and the other end of the resistor R5139 is grounded; the non-inverting input end of the operational amplifier is connected with the singlechip and is used for receiving a given VDA signal output by the singlechip, and the inverting input end of the operational amplifier U5107 is connected with the output end of the operational amplifier U5107; one end of the resistor R5105 is connected with the output end of the operational amplifier U5107, and the other end of the resistor R5100 is connected with the capacitor C5117 in parallel and then grounded.
Further, the voltage follower sub-circuit further includes a capacitor C5120, a resistor R5136, and a zener diode ZD5101;
The positive electrode power supply end of the operational amplifier U5107 is grounded through a capacitor C5120, and the negative electrode power supply end is grounded; the positive electrode of the voltage stabilizing diode ZD5101 is grounded, and the negative electrode of the voltage stabilizing diode ZD5101 is connected with the positive electrode power supply end of the operational amplifier U5107; one end of the resistor R5136 is connected with the power supply 12VCC2, and the other end of the resistor R5136 is connected with the positive power supply end of the operational amplifier U5107.
Further, the isolating the given sub-circuit includes isolating the given chip U5104.
Further, the isolation given chip U5104 employs ACPL-C87A-500E, and the isolation given sub-circuit further includes a resistor R5117, a resistor R5119, a capacitor C5115, and a capacitor C5116;
The terminal VIN of the given isolation chip U5104 is connected with the output end of the operational amplifier U5107 through a resistor R5105, the terminal SHDN is connected with a power supply 5VCC through a resistor R5117, the terminal GND1 and the terminal CND2 are grounded, and the terminal VDD1 and the terminal VDD2 are connected with the power supply 5 VCC; one end of the resistor R5119 is connected with the terminal SHDN isolating the given chip U5104, and the other end of the resistor R5119 is grounded; one end of the capacitor C5115 is connected with the terminal VDD1 for isolating the given chip U5104, and the other end of the capacitor C5115 is grounded; one end of the capacitor C5116 is connected to the terminal VDD2 isolating the given chip U5104, and the other end is grounded.
Further, the amplifying sub-circuit includes a resistor R5112, a resistor R5122, a capacitor C5121, a resistor R5219, an operational amplifier U5102B, a resistor R5102, a capacitor C5114, a resistor R5116, a capacitor C5119, and a resistor R5130;
The inverting input end of the operational amplifier U5102B is connected with the negative electrode output end of the given isolation chip U5104 through a resistor R5112, the non-inverting input end of the operational amplifier U5102B is connected with the positive electrode output end of the given isolation chip U5104 through a resistor R5122, and the output end of the operational amplifier U5102B is connected with the inverting input end of the capacitor C5114 after being connected in parallel through the resistor R5102; the capacitor C5121 and the resistor R5219 are connected in parallel and then connected with the non-inverting input end of the operational amplifier U5102B; one end of the capacitor C5119 is connected with the output end of the operational amplifier U5102B after being connected in parallel with the resistor R5130, and the other end of the capacitor C5119 is grounded.
Further, the voltage negative feedback regulation sub-circuit comprises an operational amplifier U5102A, a resistor R5120, a capacitor C5109 and a capacitor C5103;
The non-inverting input end of the operational amplifier U5102A is connected with the output end of the operational amplifier U5102B through a resistor R5116, and the inverting input end of the operational amplifier U5102A is connected with the high side of the BUCK sub-circuit; after the resistor R5120 and the capacitor C5109 are connected in series, one end of the resistor R5120 is connected with the inverting input end of the operational amplifier U5102A, and the other end of the resistor R5120 is connected with the output end of the operational amplifier U5102A; one end of the capacitor C5103 is connected with the inverting input end of the operational amplifier U5102A, and the other end of the capacitor C5103 is connected with the output end of the operational amplifier U5102A.
Further, the voltage negative feedback regulation subcircuit further comprises a resistor R5137, a capacitor C5118, a voltage stabilizing diode ZD5102, a resistor R5111, a resistor R5143, a resistor R5121, a resistor R5123, a resistor R5134 and a capacitor C5124;
The positive power supply end of the operational amplifier U5102A is connected with the power supply 12VCC1 through a resistor R5137, and the negative power supply end is grounded; one end of the capacitor C5118 is connected with the positive power supply end of the operational amplifier U5102A, and the other end of the capacitor C5118 is grounded; the positive electrode of the voltage stabilizing diode ZD5102 is grounded, and the negative electrode of the voltage stabilizing diode ZD5102 is connected with the power supply 12VCC1 through a resistor R5137; the inverting input end of the operational amplifier U5102A is connected with the high side of the BUCK sub-circuit through a resistor R5121, a resistor R5143 and a resistor R5111 which are sequentially connected in series; after the resistor R5123 is connected in series with the resistor R5134, one end of the resistor R5123 is connected with the inverting input end of the operational amplifier U5102A, and the other end of the resistor R5134 is grounded; one end of the capacitor C5124 is connected to the inverting input terminal of the operational amplifier U5102A, and the other end is grounded.
Further, the optocoupler isolator sub-circuit comprises a resistor R5107, a resistor R5108, an optocoupler U5101 and a capacitor C5108;
The anode of the optical coupler U5101 is connected with a power supply 12VCC1 through a resistor R5108, and the cathode is connected with the output end of the operational amplifier U5102A; one end of the resistor R5107 is connected with the anode of the optical coupler U5101, and the other end of the resistor R5107 is connected with the cathode of the optical coupler U5101; the collector of the optical coupler U5101 is connected with the control end of the MOS tube driving sub-circuit through a switching power supply, and the emitter is grounded; one end of the capacitor C5108 is connected to the collector of the optocoupler U5101, and the other end is connected to the emitter of the optocoupler U5101.
Further, the MOS transistor driving sub-circuit includes a MOS transistor Q5100, a capacitor C5100, a resistor R5101, a resistor R5115, a resistor R5104, and a zener diode ZD5100;
The grid electrode of the MOS tube Q5100 is connected with the collector electrode of the optocoupler U5101 through a switching power supply, the drain electrode is connected with the low side of the BUCK sub-circuit, and the source electrode is grounded through a resistor R5115; after being connected in series with the resistor R5101, one end of the capacitor C5100 is connected with the drain electrode of the MOS tube Q5100, and the other end of the capacitor C5100 is connected with the source electrode of the MOS tube Q5100; one end of the resistor R5104 is connected with the grid electrode of the MOS tube Q5100, and the other end of the resistor R5104 is grounded; the positive pole of the voltage stabilizing diode ZD5100 is grounded, and the negative pole of the voltage stabilizing diode ZD5100 is connected with the grid electrode of the MOS tube Q5100.
Compared with the prior art, the BUCK output adjustable circuit suitable for isolating given PWM has the following advantages:
The BUCK output adjustable circuit suitable for isolating given PWM has good stability and strong anti-interference capability, and can be used for realizing adjustment of output voltage of the BUCK circuit. The VDA signal on the secondary side is amplified to a signal actually required by the circuit through isolating a given signal and an operational amplifier, and then a feedback signal is provided through a voltage comparator, so that the given isolated feedback signal is output, and finally the signal obtained through an optocoupler isolation subcircuit can be used for adjusting the output voltage of the BUCK circuit.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:
FIG. 1 is a schematic diagram of a circuit structure of a driving module and a BUCK output module in a BUCK output adjustable circuit for isolating a given PWM according to an embodiment of the present utility model;
FIG. 2 is a circuit diagram of a voltage follower sub-circuit in a BUCK output adjustable circuit suitable for isolating a given PWM according to an embodiment of the present utility model;
FIG. 3 is a circuit diagram of a BUCK output adjustable circuit adapted to isolate a given PWM to isolate a given sub-circuit in accordance with an embodiment of the present utility model;
FIG. 4 is a circuit diagram of an amplifier sub-circuit in a BUCK output adjustable circuit suitable for isolating a given PWM according to an embodiment of the present utility model;
FIG. 5 is a circuit diagram of a voltage negative feedback regulator sub-circuit in a BUCK output adjustable circuit suitable for isolating a given PWM according to an embodiment of the present utility model;
FIG. 6 is a circuit diagram of an optocoupler isolator sub-circuit in a BUCK output adjustable circuit adapted to isolate a given PWM according to an embodiment of the present utility model.
Detailed Description
It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present utility model, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art in a specific case.
The utility model will be described in detail below with reference to the drawings in connection with embodiments.
A BUCK output adjustable circuit suitable for isolating given PWM, as shown in figures 1-6, comprises a control module, an isolation feedback module, a driving module and a BUCK output module.
The control module comprises a single chip microcomputer (not shown in the figure). The single chip microcomputer can be an existing 51 single chip microcomputer or STM32 single chip microcomputer, and a person skilled in the art can select single chip microcomputers of other types according to actual needs, and the description is omitted here.
The isolation feedback module comprises a voltage following sub-circuit, an isolation given sub-circuit, an amplifying sub-circuit, a voltage negative feedback regulating sub-circuit and an optocoupler isolation sub-circuit which are connected in sequence; the voltage follower sub-circuit is connected with the singlechip to receive a given VDA signal output by the singlechip.
The driving module comprises an MOS tube driving sub-circuit, wherein the control end of the MOS tube driving sub-circuit is connected with the output end of an optocoupler isolation sub-circuit (not shown in the figure) through a switching power supply so as to realize that the control module controls the driving module through an isolation feedback module. The switching power supply may be an existing UC3842 type switching power supply, and those skilled in the art may select other types of switching power supplies according to actual needs, which will not be described herein.
The BUCK output module comprises a BUCK sub-circuit, and the low side of the BUCK sub-circuit is connected with the MOS tube driving sub-circuit so as to realize output control of the BUCK output module. Illustratively, the low side of the BUCK sub-circuit is its low voltage terminal and the high side of the BUCK sub-circuit is its high voltage terminal.
In the practical application process, because the driving mode of the BUCK circuit needs to be considered, the MOS tube is arranged on the high side or the low side of the BUCK circuit, so that the difference of circuit structures is caused, the conventional low-voltage input and output BUCK circuit is simpler to drive, no matter the MOS tube is arranged on the high side or the low side, but if the input is high voltage exceeding 100V, the driving of an NMOS becomes complicated, the PMOS tube with better parameters is more expensive, and the cost of the circuit is increased.
Therefore, the MOS tube is arranged at the low side output of the BUCK circuit, namely the low side of the BUCK sub-circuit is connected with the MOS tube driving sub-circuit, so that the low side driving can be realized, and the requirement on the MOS tube is lower. In addition, through setting up the isolation feedback module, can accomplish the isolation and can synchronous given benchmark for this kind of adjustable circuit of output has certain interference killing feature.
Optionally, the voltage follower sub-circuit includes a resistor R5139, an operational amplifier U5107, a resistor R5105, a resistor R5100, and a capacitor C5117.
Specifically, one end of a resistor R5139 is connected with the non-inverting input end of the operational amplifier U5107, and the other end of the resistor R5139 is grounded; the non-inverting input end of the operational amplifier is connected with the singlechip and is used for receiving a given VDA signal output by the singlechip, and the inverting input end of the operational amplifier U5107 is connected with the output end of the operational amplifier U5107; one end of the resistor R5105 is connected with the output end of the operational amplifier U5107, and the other end of the resistor R5100 is connected with the capacitor C5117 in parallel and then grounded.
In practical applications, the voltage follower sub-circuit further includes a capacitor C5120, a resistor R5136, and a zener diode ZD5101. Specifically, the positive power supply end of the operational amplifier U5107 is grounded through the capacitor C5120, and the negative power supply end is grounded; the positive electrode of the voltage stabilizing diode ZD5101 is grounded, and the negative electrode of the voltage stabilizing diode ZD5101 is connected with the positive electrode power supply end of the operational amplifier U5107; one end of the resistor R5136 is connected with the power supply 12VCC2, and the other end of the resistor R5136 is connected with the positive power supply end of the operational amplifier U5107.
Optionally, the isolating the given sub-circuit includes isolating the given chip U5104. Illustratively, the isolated given chip U5104 employs an isolated op-amp given chip of model number ACPL-C87A-500E, which also includes resistor R5117, resistor R5119, capacitor C5115, and capacitor C5116.
Specifically, terminal VIN isolating given chip U5104 is connected with the output terminal of operational amplifier U5107 through resistor R5105, terminal SHDN is connected with power supply 5VCC through resistor R5117, terminal GND1 and terminal CND2 are grounded, terminal VDD1 and terminal VDD2 are connected with power supply 5 VCC; one end of the resistor R5119 is connected with the terminal SHDN isolating the given chip U5104, and the other end of the resistor R5119 is grounded; one end of the capacitor C5115 is connected with the terminal VDD1 for isolating the given chip U5104, and the other end of the capacitor C5115 is grounded; one end of the capacitor C5116 is connected to the terminal VDD2 isolating the given chip U5104, and the other end is grounded.
Optionally, the amplifying sub-circuit includes a resistor R5112, a resistor R5122, a capacitor C5121, a resistor R5219, an operational amplifier U5102B, a resistor R5102, a capacitor C5114, a resistor R5116, a capacitor C5119, and a resistor R5130.
Specifically, the inverting input end of the operational amplifier U5102B is connected with the negative electrode output end of the isolation given chip U5104 through a resistor R5112, the non-inverting input end is connected with the positive electrode output end of the isolation given chip U5104 through a resistor R5122, and the output end of the operational amplifier U5102B is connected with the inverting input end of the capacitor C5114 after being connected in parallel through the resistor R5102; the capacitor C5121 and the resistor R5219 are connected in parallel and then connected with the non-inverting input end of the operational amplifier U5102B; one end of the capacitor C5119 is connected with the output end of the operational amplifier U5102B after being connected in parallel with the resistor R5130, and the other end of the capacitor C5119 is grounded.
Optionally, the voltage negative feedback regulator sub-circuit includes an operational amplifier U5102A, a resistor R5120, a capacitor C5109, and a capacitor C5103.
Specifically, the non-inverting input end of the operational amplifier U5102A is connected with the output end of the operational amplifier U5102B through a resistor R5116, and the inverting input end is connected with the high side of the BUCK sub-circuit; after the resistor R5120 and the capacitor C5109 are connected in series, one end of the resistor R5120 is connected with the inverting input end of the operational amplifier U5102A, and the other end of the resistor R5120 is connected with the output end of the operational amplifier U5102A; one end of the capacitor C5103 is connected with the inverting input end of the operational amplifier U5102A, and the other end of the capacitor C5103 is connected with the output end of the operational amplifier U5102A.
In the practical application process, the voltage negative feedback regulating sub-circuit further includes a resistor R5137, a capacitor C5118, a zener diode ZD5102, a resistor R5111, a resistor R5143, a resistor R5121, a resistor R5123, a resistor R5134, and a capacitor C5124.
Specifically, the positive power supply end of the operational amplifier U5102A is connected with the power supply 12VCC1 through a resistor R5137, and the negative power supply end is grounded; one end of the capacitor C5118 is connected with the positive power supply end of the operational amplifier U5102A, and the other end of the capacitor C5118 is grounded; the positive electrode of the voltage stabilizing diode ZD5102 is grounded, and the negative electrode of the voltage stabilizing diode ZD5102 is connected with the power supply 12VCC1 through a resistor R5137; the inverting input end of the operational amplifier U5102A is connected with the high side of the BUCK sub-circuit through a resistor R5121, a resistor R5143 and a resistor R5111 which are sequentially connected in series; after the resistor R5123 is connected in series with the resistor R5134, one end of the resistor R5123 is connected with the inverting input end of the operational amplifier U5102A, and the other end of the resistor R5134 is grounded; one end of the capacitor C5124 is connected to the inverting input terminal of the operational amplifier U5102A, and the other end is grounded.
Optionally, the optocoupler isolator sub-circuit includes a resistor R5107, a resistor R5108, an optocoupler U5101, and a capacitor C5108. The optocoupler U5101 may be an existing device, and the power supply and connection manner of the optocoupler are common knowledge of those skilled in the art, so that the description thereof is omitted herein.
Specifically, the anode of the optocoupler U5101 is connected with the power supply 12VCC1 through the resistor R5108, and the cathode is connected with the output end of the operational amplifier U5102A; one end of the resistor R5107 is connected with the anode of the optical coupler U5101, and the other end of the resistor R5107 is connected with the cathode of the optical coupler U5101; the collector of the optical coupler U5101 is connected with the control end of the MOS tube driving sub-circuit through a switching power supply, and the emitter is grounded; one end of the capacitor C5108 is connected to the collector of the optocoupler U5101, and the other end is connected to the emitter of the optocoupler U5101.
Optionally, the MOS transistor driving sub-circuit includes a MOS transistor Q5100, a capacitor C5100, a resistor R5101, a resistor R5115, a resistor R5104, and a zener diode ZD5100. For example, the MOS transistor Q5100 may be a MOS transistor having a model number ipa60r060p7 xksa.
Specifically, the grid electrode of the MOS tube Q5100 is connected with the collector electrode of the optocoupler U5101 through a switching power supply, the drain electrode is connected with the low side of the BUCK sub-circuit, and the source electrode is grounded through a resistor R5115; after being connected in series with the resistor R5101, one end of the capacitor C5100 is connected with the drain electrode of the MOS tube Q5100, and the other end of the capacitor C5100 is connected with the source electrode of the MOS tube Q5100; one end of the resistor R5104 is connected with the grid electrode of the MOS tube Q5100, and the other end of the resistor R5104 is grounded; the positive pole of the voltage stabilizing diode ZD5100 is grounded, and the negative pole of the voltage stabilizing diode ZD5100 is connected with the grid electrode of the MOS tube Q5100.
In the practical application process, the output adjustable circuit can be used with reference to the following steps:
Firstly, a VDA signal is given through a singlechip, wherein the VDA signal is a square wave signal with the frequency of 50hz and different duty ratios. The VDA signal is then input to a voltage follower sub-circuit to improve the anti-jamming capability and then to an isolation sub-circuit. And amplifying the signal output by the isolated given sub-circuit through the amplifying sub-circuit, and then completing voltage negative feedback regulation through the voltage negative feedback regulation sub-circuit to realize the feedback regulation of the buck circuit. And finally, the control of the switching power supply is realized by the signals output by the optocoupler isolation subcircuit, and the on-off control of the MOS tube driving subcircuit is realized by the switching power supply. When the duty ratio is full, the MOS transistor Q5100 in the MOS transistor driving sub-circuit is directly connected, so that the BUCK sub-circuit does not participate in the voltage reduction function, directly connected output is realized, and the circuit is flexible to use.
The output adjustable circuit of the embodiment can firstly isolate a given signal through a VDA signal of a secondary side and then amplify the given signal to a signal actually required by the circuit through an operational amplifier. Again, the feedback signal is provided by a voltage comparator, thereby enabling the output of a given isolated feedback signal. Finally, the signals obtained by the optocoupler isolation subcircuit can be used for realizing the adjustment of the output voltage of the BUCK circuit.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (10)
1. A BUCK output adjustable circuit adapted to isolate a given PWM, characterized by: the device comprises a control module, an isolation feedback module, a driving module and a BUCK output module;
The control module comprises a singlechip;
The isolation feedback module comprises a voltage following sub-circuit, an isolation given sub-circuit, an amplifying sub-circuit, a voltage negative feedback regulating sub-circuit and an optocoupler isolation sub-circuit which are connected in sequence; the voltage follower sub-circuit is connected with the singlechip to receive a given VDA signal output by the singlechip;
The driving module comprises an MOS tube driving sub-circuit, and the control end of the MOS tube driving sub-circuit is connected with the output end of the optocoupler isolation sub-circuit through a switching power supply so as to realize that the control module controls the driving module through the isolation feedback module;
The BUCK output module comprises a BUCK sub-circuit, and the low side of the BUCK sub-circuit is connected with the MOS tube driving sub-circuit so as to realize output control of the BUCK output module.
2. A BUCK output-adjustable circuit adapted to isolate a given PWM according to claim 1, wherein: the voltage follower sub-circuit comprises a resistor R5139, an operational amplifier U5107, a resistor R5105, a resistor R5100 and a capacitor C5117;
One end of the resistor R5139 is connected with the non-inverting input end of the operational amplifier U5107, and the other end of the resistor R5139 is grounded; the non-inverting input end of the operational amplifier is connected with the singlechip and is used for receiving a given VDA signal output by the singlechip, and the inverting input end of the operational amplifier U5107 is connected with the output end of the operational amplifier U5107; one end of the resistor R5105 is connected with the output end of the operational amplifier U5107, and the other end of the resistor R5100 is connected with the capacitor C5117 in parallel and then grounded.
3. A BUCK output-adjustable circuit adapted to isolate a given PWM according to claim 2, wherein: the voltage follower sub-circuit further comprises a capacitor C5120, a resistor R5136 and a zener diode ZD5101;
The positive electrode power supply end of the operational amplifier U5107 is grounded through a capacitor C5120, and the negative electrode power supply end is grounded; the positive electrode of the voltage stabilizing diode ZD5101 is grounded, and the negative electrode of the voltage stabilizing diode ZD5101 is connected with the positive electrode power supply end of the operational amplifier U5107; one end of the resistor R5136 is connected with the power supply 12VCC2, and the other end of the resistor R5136 is connected with the positive power supply end of the operational amplifier U5107.
4. A BUCK output-adjustable circuit adapted to isolate a given PWM according to claim 2 or 3, wherein: the isolating the given sub-circuit includes isolating the given chip U5104.
5. A BUCK output-adjustable circuit adapted to isolate a given PWM according to claim 4, wherein: the isolation given chip U5104 adopts ACPL-C87A-500E, and the isolation given sub-circuit further comprises a resistor R5117, a resistor R5119, a capacitor C5115 and a capacitor C5116;
The terminal VIN of the given isolation chip U5104 is connected with the output end of the operational amplifier U5107 through a resistor R5105, the terminal SHDN is connected with a power supply 5VCC through a resistor R5117, the terminal GND1 and the terminal CND2 are grounded, and the terminal VDD1 and the terminal VDD2 are connected with the power supply 5 VCC; one end of the resistor R5119 is connected with the terminal SHDN isolating the given chip U5104, and the other end of the resistor R5119 is grounded; one end of the capacitor C5115 is connected with the terminal VDD1 for isolating the given chip U5104, and the other end of the capacitor C5115 is grounded; one end of the capacitor C5116 is connected to the terminal VDD2 isolating the given chip U5104, and the other end is grounded.
6. A BUCK output-adjustable circuit adapted to isolate a given PWM according to claim 4, wherein: the amplifying sub-circuit comprises a resistor R5112, a resistor R5122, a capacitor C5121, a resistor R5219, an operational amplifier U5102B, a resistor R5102, a capacitor C5114, a resistor R5116, a capacitor C5119 and a resistor R5130;
The inverting input end of the operational amplifier U5102B is connected with the negative electrode output end of the given isolation chip U5104 through a resistor R5112, the non-inverting input end of the operational amplifier U5102B is connected with the positive electrode output end of the given isolation chip U5104 through a resistor R5122, and the output end of the operational amplifier U5102B is connected with the inverting input end of the capacitor C5114 after being connected in parallel through the resistor R5102; the capacitor C5121 and the resistor R5219 are connected in parallel and then connected with the non-inverting input end of the operational amplifier U5102B; one end of the capacitor C5119 is connected with the output end of the operational amplifier U5102B after being connected in parallel with the resistor R5130, and the other end of the capacitor C5119 is grounded.
7. A BUCK output-adjustable circuit adapted to isolate a given PWM according to claim 6, wherein: the voltage negative feedback regulation sub-circuit comprises an operational amplifier U5102A, a resistor R5120, a capacitor C5109 and a capacitor C5103;
The non-inverting input end of the operational amplifier U5102A is connected with the output end of the operational amplifier U5102B through a resistor R5116, and the inverting input end of the operational amplifier U5102A is connected with the high side of the BUCK sub-circuit; after the resistor R5120 and the capacitor C5109 are connected in series, one end of the resistor R5120 is connected with the inverting input end of the operational amplifier U5102A, and the other end of the resistor R5120 is connected with the output end of the operational amplifier U5102A; one end of the capacitor C5103 is connected with the inverting input end of the operational amplifier U5102A, and the other end of the capacitor C5103 is connected with the output end of the operational amplifier U5102A.
8. A BUCK output-adjustable circuit adapted to isolate a given PWM according to claim 7, wherein: the voltage negative feedback regulation subcircuit also comprises a resistor R5137, a capacitor C5118, a voltage stabilizing diode ZD5102, a resistor R5111, a resistor R5143, a resistor R5121, a resistor R5123, a resistor R5134 and a capacitor C5124;
The positive power supply end of the operational amplifier U5102A is connected with the power supply 12VCC1 through a resistor R5137, and the negative power supply end is grounded; one end of the capacitor C5118 is connected with the positive power supply end of the operational amplifier U5102A, and the other end of the capacitor C5118 is grounded; the positive electrode of the voltage stabilizing diode ZD5102 is grounded, and the negative electrode of the voltage stabilizing diode ZD5102 is connected with the power supply 12VCC1 through a resistor R5137; the inverting input end of the operational amplifier U5102A is connected with the high side of the BUCK sub-circuit through a resistor R5121, a resistor R5143 and a resistor R5111 which are sequentially connected in series; after the resistor R5123 is connected in series with the resistor R5134, one end of the resistor R5123 is connected with the inverting input end of the operational amplifier U5102A, and the other end of the resistor R5134 is grounded; one end of the capacitor C5124 is connected to the inverting input terminal of the operational amplifier U5102A, and the other end is grounded.
9. A BUCK output-adjustable circuit adapted to isolate a given PWM according to claim 8, wherein: the optocoupler isolation subcircuit comprises a resistor R5107, a resistor R5108, an optocoupler U5101 and a capacitor C5108;
The anode of the optical coupler U5101 is connected with a power supply 12VCC1 through a resistor R5108, and the cathode is connected with the output end of the operational amplifier U5102A; one end of the resistor R5107 is connected with the anode of the optical coupler U5101, and the other end of the resistor R5107 is connected with the cathode of the optical coupler U5101; the collector of the optical coupler U5101 is connected with the control end of the MOS tube driving sub-circuit through a switching power supply, and the emitter is grounded; one end of the capacitor C5108 is connected to the collector of the optocoupler U5101, and the other end is connected to the emitter of the optocoupler U5101.
10. A BUCK output-adjustable circuit adapted to isolate a given PWM according to claim 9, wherein: the MOS tube driving sub-circuit comprises a MOS tube Q5100, a capacitor C5100, a resistor R5101, a resistor R5115, a resistor R5104 and a zener diode ZD5100;
The grid electrode of the MOS tube Q5100 is connected with the collector electrode of the optocoupler U5101 through a switching power supply, the drain electrode is connected with the low side of the BUCK sub-circuit, and the source electrode is grounded through a resistor R5115; after being connected in series with the resistor R5101, one end of the capacitor C5100 is connected with the drain electrode of the MOS tube Q5100, and the other end of the capacitor C5100 is connected with the source electrode of the MOS tube Q5100; one end of the resistor R5104 is connected with the grid electrode of the MOS tube Q5100, and the other end of the resistor R5104 is grounded; the positive pole of the voltage stabilizing diode ZD5100 is grounded, and the negative pole of the voltage stabilizing diode ZD5100 is connected with the grid electrode of the MOS tube Q5100.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323120161.8U CN221227367U (en) | 2023-11-20 | 2023-11-20 | BUCK output adjustable circuit suitable for isolating given PWM |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323120161.8U CN221227367U (en) | 2023-11-20 | 2023-11-20 | BUCK output adjustable circuit suitable for isolating given PWM |
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| Publication Number | Publication Date |
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| CN221227367U true CN221227367U (en) | 2024-06-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202323120161.8U Active CN221227367U (en) | 2023-11-20 | 2023-11-20 | BUCK output adjustable circuit suitable for isolating given PWM |
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| Country | Link |
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| CN (1) | CN221227367U (en) |
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