CN219957717U - Bus voltage detection circuit and circuit board - Google Patents
Bus voltage detection circuit and circuit board Download PDFInfo
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- CN219957717U CN219957717U CN202320996352.1U CN202320996352U CN219957717U CN 219957717 U CN219957717 U CN 219957717U CN 202320996352 U CN202320996352 U CN 202320996352U CN 219957717 U CN219957717 U CN 219957717U
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Abstract
The embodiment of the utility model relates to the technical field of power electronics and discloses a bus voltage detection circuit and a circuit board, wherein the detection circuit comprises a transformer, a switch unit, a power supply unit and a sampling unit, the transformer comprises a primary winding and a plurality of secondary windings, the secondary windings at least comprise the power supply winding and the sampling winding, one end of the primary winding is connected with the positive electrode of a bus, the input end of the switch unit is connected with the other end of the primary winding and the output end of the switch unit is connected with the negative electrode of the bus, the input end of the power supply unit is connected with the synonym end of the power supply winding and is configured to be connected with the power supply winding when the switch unit is conducted, and the input end of the sampling unit is connected with the synonym end of the power supply winding and is configured to be connected with the sampling winding and collect bus voltage when the switch unit is turned off.
Description
Technical Field
The embodiment of the utility model relates to the technical field of power electronics, in particular to a bus voltage detection circuit and a circuit board.
Background
For driving wave generation of motor equipment such as servo, the size of duty ratio is usually adjusted by referring to the size of bus voltage, the bus voltage belongs to strong current, the control part belongs to weak current, and the safety requirements between the strong current and the weak current are required to meet the requirements of reinforcing insulation grades in national standards. Currently, a mode of strong and weak electric isolation is usually to adopt large-resistance isolation, and a plurality of resistors are arranged between a sampling circuit and a bus to meet the insulation requirement between strong and weak electric or strengthen insulation.
In the process of implementing the embodiments of the present utility model, the inventors found that at least the following problems exist in the above related art: the scheme of big resistance isolation needs a plurality of resistance straight lines to put, and the voltage difference is bigger between power supply and the sampling chip, and then the resistance that needs is more, and the space that the resistance occupies is great when influencing circuit board overall arrangement and wiring on the circuit board, and the cost is also higher.
Disclosure of Invention
The embodiment of the utility model provides a bus voltage detection circuit and a circuit board.
The aim of the embodiment of the utility model is realized by the following technical scheme:
in order to solve the above technical problem, in a first aspect, an embodiment of the present utility model provides a bus voltage detection circuit, including: the transformer comprises a primary winding and a plurality of secondary windings, wherein one end of the primary winding is connected with the positive electrode of the bus, and the secondary windings at least comprise a power supply winding and a sampling winding; the input end of the switch unit is connected with the other end of the primary winding, and the output end of the switch unit is connected with the negative electrode of the bus; the input end of the power supply unit is connected with the synonym end of the power supply winding, and the power supply unit is configured to be communicated with the power supply winding when the switch unit is conducted; and the input end of the sampling unit is connected with the same-name end of the power supply winding, and the sampling unit is configured to be connected with the sampling winding and collect bus voltage when the switching unit is turned off.
In some embodiments, the bus voltage detection circuit further includes a controller, an output terminal of which is connected to the control terminal of the switching unit, configured such that the switching unit is turned on when a high level signal is output and turned off when a low level signal is output.
In some embodiments, the switching unit includes a transistor having a gate connected to an output terminal of the controller, a drain connected to the other end of the primary winding, and a source connected to a negative electrode of the bus bar.
In some embodiments, the transistor is an N-channel insulated gate bipolar transistor, and a set of zener diodes connected in series in reverse direction is further included between the gate and the drain of the transistor.
In some embodiments, the power supply unit includes: the anode of the first diode is connected with the synonym end of the power supply winding, the cathode of the first diode is connected with a power supply source, and the power supply unit is connected with the power supply winding when the first diode is configured to be conducted; and the anode of the electrolytic capacitor is connected with the cathode of the first diode, and the cathode of the electrolytic capacitor is connected with the common terminal.
In some embodiments, the power supply unit further comprises: a first filter capacitor connected in parallel with the electrolytic capacitor; and a first resistor connected in parallel with the electrolytic capacitor.
In some embodiments, the sampling unit comprises: the anode of the second diode is connected with the same-name end of the power supply winding, the cathode of the second diode is connected with the voltage sampling end, and the sampling unit is connected with the sampling winding when the second diode is configured to be conducted; and the input end of the filter circuit is connected with the cathode of the second diode, and the output end of the filter circuit is used for outputting the bus voltage.
In some embodiments, the filtering circuit comprises: the second resistor is connected between the homonymous end of the power supply winding and the anode of the second diode; a third resistor connected in parallel with the second resistor; the fourth resistor is connected between the cathode of the second diode and the voltage sampling end; one end of the fifth resistor is connected between the fourth resistor and the voltage sampling end, and the other end of the fifth resistor is grounded; a sixth resistor connected in parallel with the fifth resistor; one end of the second filter capacitor is connected between the cathode of the second diode and the fourth resistor, and the other end of the second filter capacitor is grounded; and one end of the third filter capacitor is connected between the fourth resistor and the voltage sampling end, and the other end of the third filter capacitor is grounded.
In some embodiments, the controller further includes the voltage sampling end, the voltage sampling end is connected with the output end of the filter circuit, or the bus voltage detection circuit further includes a voltage detection chip, and the voltage sampling end of the voltage detection chip is connected with the output end of the filter circuit.
In order to solve the above technical problem, in a second aspect, an embodiment of the present utility model provides a circuit board, which is characterized in that: the bus voltage detection circuit as set forth in the first aspect.
Compared with the prior art, the utility model has the beneficial effects that: different from the situation of the prior art, the embodiment of the utility model provides a bus voltage detection circuit and a circuit board, wherein the detection circuit comprises a transformer, a switch unit, a power supply unit and a sampling unit, the transformer comprises a primary winding and a plurality of secondary windings, the secondary windings at least comprise a power supply winding and a sampling winding, one end of the primary winding is connected with the positive electrode of a bus, the input end of the switch unit is connected with the other end of the primary winding and the output end of the switch unit is connected with the negative electrode of the bus, the input end of the power supply unit is connected with the synonym end of the power supply winding and is configured to be connected with the power supply winding when the switch unit is conducted, the input end of the sampling unit is connected with the synonym end of the power supply winding and is configured to be connected with the sampling winding and collect the bus voltage when the switch unit is turned off.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements/modules, and in which the figures are not to be taken in a limiting sense, unless expressly stated otherwise.
FIG. 1 is a block diagram of a bus voltage detection circuit according to an embodiment of the present utility model;
FIG. 2 is a block diagram of another bus voltage detection circuit according to an embodiment of the present utility model;
fig. 3 is a circuit diagram of a bus voltage detection circuit according to an embodiment of the present utility model;
fig. 4 is a block diagram of a circuit board according to an embodiment of the present utility model;
reference numerals: 100. a bus voltage detection circuit; 110. a transformer; 120. a switching unit; 130. a power supply unit; 140. a sampling unit; 150. a controller; 160. a voltage detection chip; l1, primary winding; 111. a secondary winding; l2, a power supply winding; l3, sampling windings; 141. a filter circuit; p, a bus; q1, a transistor; G. a gate; D. a drain electrode; s, a source electrode; the DVR and the output end of the controller; DBVD and voltage sampling end; ZD1, a zener diode; d1, a first diode; d2, a second diode; c1, an electrolytic capacitor; c2, a first filter capacitor; c4, a third filter capacitor; r1, a first resistor; r2, a second resistor; r3, a third resistor; r4, a fourth resistor; r5, a fifth resistor; r6, a sixth resistor; c3, a second filter capacitor; 10. a circuit board.
Detailed Description
The present utility model will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present utility model, but are not intended to limit the utility model in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present utility model.
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
It should be noted that, if not in conflict, the features of the embodiments of the present utility model may be combined with each other, which is within the protection scope of the present utility model. In addition, although functional block division is performed in the device schematic, in some cases, block division may be different from that in the device. Furthermore, the words "first," "second," "third," and the like, as used herein, are not to be limited to data and an order of execution, but merely to distinguish between identical or similar items that have substantially the same function and effect, and the terms "upper," "lower," and similar expressions are used herein for the purpose of illustration only. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
In addition, the technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
At present, when a driver outputs a driving signal, the duty ratio of the driving signal is usually regulated by referring to the voltage of a bus, and the driver works under weak current because the bus voltage is strong current, so as to meet the safety rule requirement of the strong current and the weak current, and solve the problem of large occupied space of the traditional large-resistance isolation scheme.
In particular, embodiments of the present utility model are further described below with reference to the accompanying drawings.
Referring to fig. 1, a block diagram of a bus voltage detection circuit 100 according to an embodiment of the present utility model is shown, where the bus voltage detection circuit 100 at least includes: transformer 110, switching unit 120, power supply unit 130, sampling unit 140. Further, in some embodiments, please refer to fig. 2, which shows a block diagram of another bus voltage detection circuit 100 according to an embodiment of the present utility model, the bus voltage detection circuit 100 may further include: a controller 150 and/or a voltage detection chip 160.
The transformer 110 includes a primary winding L1 and a plurality of secondary windings 111, one end of the primary winding L1 is connected with an anode p+ of a bus, the secondary windings 111 at least include a power supply winding L2 and a sampling winding L3, and a plurality of secondary windings 111 are provided to realize the output of multiple power supplies with the same or different voltages. The embodiment of the utility model realizes that the strong current is scaled down to be input into the voltage range which can be acquired by the controller 150 and/or the voltage detection chip 160 through the winding proportion of the transformer 110, thereby realizing the sampling of the bus voltage. Referring to fig. 3, a circuit diagram of a bus voltage detection circuit 100 according to an embodiment of the present utility model is shown, in the example shown in fig. 3, the number of primary windings L1 is 1, the number of secondary windings 111 is two, in actual use, the number of primary windings L1, secondary windings 111 and magnetic cores can be adjusted according to the safety requirements of the strong and weak electrical insulation level, the specific situation of the functional circuit of the module, device and equipment to which the bus voltage detection circuit 100 is applied, and can also be adjusted according to the voltage difference between the working voltage and the bus voltage of the controller 150 and/or the voltage detection chip 160 connected to the output end of the sampling unit 140, so as to adjust and output the required working voltage.
The input end of the switch unit 120 is connected with the other end of the primary winding L1, the output end of the switch unit is connected with the negative electrode P-of the bus, the switch unit 120 is configured to be turned off when the bus voltage needs to be collected, and turned on when the bus voltage does not need to be collected, and the connection relationship between the same name end and different name end of each secondary winding 111 is combined to realize the switching between the power supply function of the secondary winding 111 and the bus voltage collection function. Specifically, referring to fig. 3, the switching unit 120 includes a transistor (transistor) Q1, a gate G thereof is connected to the output DVR of the controller 150, a drain D thereof is connected to the other end of the primary winding L1, and a source S thereof is connected to the negative electrode P of the bus bar. The transistor Q1 is an N-channel insulated gate bipolar transistor Q1, and a set of zener diodes ZD1 connected in reverse series is further included between the gate G and the drain D of the transistor Q1. Wherein, the set of zener diodes ZD1 connected in reverse series refers to the connection of the anodes of the two zener diodes. Alternatively, the transistor Q1 may be a bipolar transistor (Bipolar Junction Transistor, BJT), a J-type field effect transistor (Junction gate FET (Field Effect Transistor)), a Metal Oxide semiconductor field effect transistor (MOS FET), a field effect transistor (Insulated Gate Bipolar Transistor, IGBT), or the like, or may be replaced by another switching transistor, for example, an electronic Triode (Triode), a V-type trench field effect transistor (Vertical Metal Oxide Semiconductor, VMOS), or the like, which may be specifically selected according to practical needs, without being limited to the embodiment of the present utility model.
The input end of the power supply unit 130 is connected with the synonym end of the power supply winding L2, the power supply unit 130 is configured to be connected with the power supply winding L2 when the switch unit 120 is turned on, and the power supply unit 130 can supply power to a secondary circuit and a load on one side of the secondary winding and is turned on when the switch unit 120 is turned on. Alternatively, the power supply unit 130 may be connected to the primary winding L1, and supply power to the secondary circuit and the load through the primary winding L1 when the switching unit 120 is turned off. Specifically, referring to fig. 3, the power supply unit 130 includes: a first diode D1 having an anode connected to the synonym terminal of the power supply winding L2, a cathode connected to a power supply, and configured to be turned on when the power supply unit 130 is turned on with the power supply winding L2; and the anode of the electrolytic capacitor C1 is connected with the cathode of the first diode D1, and the cathode of the electrolytic capacitor C is connected with the common terminal. The first diode D1 is a rectifying diode, and the electrolytic capacitor C1 is a large-capacity capacitor. Further, referring to fig. 3, the power supply unit 130 further includes: a first filter capacitor C2 connected in parallel with the electrolytic capacitor C1; and a first resistor R1 connected in parallel with the electrolytic capacitor C1.
The input end of the sampling unit 140 is connected with the same name end of the power supply winding L2, and the sampling unit 140 is configured to be connected with the sampling winding L3 and collect bus voltage when the switch unit 120 is turned off. In the embodiment of the utility model, since the sampling winding L3 adopts the homonymous terminal for sampling and other windings such as the power supply winding L2 adopt the heteronymous terminal for obtaining the power supply, the power supply condition of the windings can be switched by the switch unit 120, the heteronymous terminal is not conducted when the homonymous terminal is conducted, otherwise the homonymous terminal is not conducted when the heteronymous terminal is conducted, and the condition of inaccurate busbar voltage sampling is avoided.
Specifically, referring to fig. 3, the sampling unit 140 includes: a second diode D2, an anode of which is connected to a homonymous terminal of the power supply winding L2, a cathode of which is connected to a voltage sampling terminal DBVD, and configured to be turned on by the sampling unit 140 when turned on; and the input end of the filter circuit 141 is connected with the cathode of the second diode D2, and the output end of the filter circuit is used for outputting the bus voltage. The filter circuit 141 includes: the second resistor R2 is connected between the homonymous end of the power supply winding L2 and the anode of the second diode D2; a third resistor R3 connected in parallel with the second resistor R2; a fourth resistor R4 connected between the cathode of the second diode D2 and the voltage sampling terminal DBVD; one end of the fifth resistor R5 is connected between the fourth resistor R4 and the voltage sampling end DBVD, and the other end of the fifth resistor R5 is grounded; a sixth resistor R6 connected in parallel with the fifth resistor R5; a second filter capacitor C3, one end of which is connected between the cathode of the second diode D2 and the fourth resistor R4, and the other end of which is grounded; and one end of the third filter capacitor C4 is connected between the fourth resistor R4 and the voltage sampling end DBVD, and the other end of the third filter capacitor C is grounded.
In some embodiments, the bus voltage detection circuit 100 may further include a controller 150 having an output terminal connected to the control terminal of the switching unit 120, configured such that the switching unit 120 is turned on when a high level signal is output and the switching unit 120 is turned off when a low level signal is output. Wherein the controller 150 further includes the voltage sampling end DBVD, and the voltage sampling end DBVD is connected to the output end of the filter circuit 141; alternatively, the bus voltage detection circuit 100 further includes a voltage detection chip 160, and a voltage sampling end DBVD of the voltage detection chip 160 is connected to an output end of the filter circuit 141. The controller 150 may be a microcontroller/single chip microcomputer (Microcontroller Unit, MCU), and specifically may select the chip type of the controller 150 and/or the voltage detection chip 160 according to actual needs. In the example shown in fig. 3, taking the controller 150 and the voltage detection chip 160 as examples, in other embodiments, the model selection of the controller 150 is performed, and whether the sampling function of the voltage detection chip 160 for the bus voltage is integrated into the controller 150 may be set according to actual needs, which is not limited by the embodiments of the present utility model.
When the bus voltage detection circuit 100 shown in fig. 3 does not need to perform the operation of collecting the bus voltage, the controller 150 outputs a high-level signal to control the transistor Q1 to be turned on, the bus voltage is applied to the primary winding L1 of the transformer 110, the primary winding is determined to be positive and negative from top to bottom according to the current flow direction and converted into magnetic energy to be transmitted to each winding on the secondary side, the sampling winding L3 is also positive and negative from top to bottom, the input end of the sampling unit 140 is low level due to the same name end, and the power supply of the sampling unit 140, that is, the voltage applied by the 24V power supply shown in fig. 3 to the input end of the sampling unit 140 is higher than the voltage applied to the first diode D1, which is the reverse voltage, so that the first diode D1 is in the off state, the bus voltage is not collected, and the electrolytic capacitor C1 is used for supplying power to the secondary circuit and/or the load; similarly, the power supply winding L2 is also positive and negative from top to bottom, and the input terminal of the power supply unit 130 is at a high level due to the synonym terminal, and the voltage applied to the second diode D2 is at a forward voltage, so that the second diode D2 is in a conductive state, and the bus voltage is adjusted to supply power to the second filter capacitor C3 and the subsequent circuit and/or load of the power supply unit 130 by the transformer 110.
When the bus voltage detection circuit 100 shown in fig. 3 needs to perform the task of collecting the bus voltage, the controller 150 outputs a low-level signal to control the transistor Q1 to be turned off, if other electric equipment or loads need to use electricity at this time, electric energy can be obtained through the primary winding L1 of the transformer 110, because of the same-name end, the input end of the sampling unit 140 is at a high level, at this time, the power supply of the sampling unit 140, the voltage applied to the first diode D1 is forward voltage, so the first diode D1 is in a conducting state, and the bus voltage is adjusted by the transformer 110 to supply power to the electrolytic capacitor and the first filter capacitor C2 and the post-stage circuit and/or the load of the sampling unit 140; similarly, the voltage applied to the second diode D2 is reverse voltage, the second diode D2 is turned off, and the power supply winding L2 of the secondary winding 111 is not operated due to the synonym terminal.
Referring to fig. 4, a block diagram of a circuit board 10 according to an embodiment of the present utility model is shown, where the circuit board 10 includes: the bus voltage detection circuit 100 is described in fig. 1 to 3 and embodiments thereof.
The circuit board 10 may be a circuit board 10 (Printed Circuit Board, PCB) in an electronic device, or a circuit board 10 of a power module/device, a power module/device for a load, and a power module/device, where the circuit board 10 can implement a function of modulating a bus voltage into a power voltage for the load, and can also implement strong and weak electrical isolation when sampling the bus voltage. For example, when the load is a servo motor, the circuit board 10 may be a circuit board 10 for powering the servo motor and providing a sampled value of the bus voltage to the servo controller 150. The circuit board 10 may integrate the units of the bus voltage detection circuit 100 shown in fig. 1 or fig. 2 and their electrical connection relationships, and further may integrate the electronic components of the bus voltage detection circuit 100 shown in fig. 3 and their electrical connection relationships. The circuit board 10 may be one piece or may be a plurality of pieces. Specifically, the number and functions of the circuit boards 10 may be set according to actual needs, such as the positions of the circuit boards in the electronic device, the connection relation between the circuit boards and the external device or the module, and the like, and the present utility model is not limited to the embodiments of the present utility model.
The embodiment of the utility model provides a bus voltage detection circuit and a circuit board, wherein the detection circuit comprises a transformer, a switch unit, a power supply unit and a sampling unit, the transformer comprises a primary winding and a plurality of secondary windings, the secondary windings at least comprise a power supply winding and a sampling winding, one end of the primary winding is connected with the positive electrode of a bus, the input end of the switch unit is connected with the other end of the primary winding, the output end of the switch unit is connected with the negative electrode of the bus, the input end of the power supply unit is connected with the synonym end of the power supply winding and is configured to be communicated with the power supply winding when the switch unit is conducted, the input end of the sampling unit is connected with the synonym end of the power supply winding and is configured to be communicated with the sampling winding and collect bus voltage when the switch unit is turned off.
It should be noted that the above-described apparatus embodiments are merely illustrative, and the units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the utility model, the steps may be implemented in any order, and there are many other variations of the different aspects of the utility model as described above, which are not provided in details for the sake of brevity; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.
Claims (10)
1. A bus voltage detection circuit, comprising:
the transformer comprises a primary winding and a plurality of secondary windings, wherein one end of the primary winding is connected with the positive electrode of the bus, and the secondary windings at least comprise a power supply winding and a sampling winding;
the input end of the switch unit is connected with the other end of the primary winding, and the output end of the switch unit is connected with the negative electrode of the bus;
the input end of the power supply unit is connected with the synonym end of the power supply winding, and the power supply unit is configured to be communicated with the power supply winding when the switch unit is conducted;
and the input end of the sampling unit is connected with the same-name end of the power supply winding, and the sampling unit is configured to be connected with the sampling winding and collect bus voltage when the switching unit is turned off.
2. The bus voltage detection circuit of claim 1, wherein,
the bus voltage detection circuit further comprises a controller, wherein the output end of the controller is connected with the control end of the switching unit, the controller is configured to be turned on when a high-level signal is output, and the controller is configured to be turned off when a low-level signal is output.
3. The bus voltage detection circuit of claim 2, wherein,
the switch unit comprises a transistor, wherein the grid electrode of the transistor is connected with the output end of the controller, the drain electrode of the transistor is connected with the other end of the primary winding, and the source electrode of the transistor is connected with the negative electrode of the bus.
4. The bus voltage detection circuit as set forth in claim 3, wherein,
the transistor is an N-channel insulated gate bipolar transistor,
a set of zener diodes connected in series in reverse direction is also included between the gate and the drain of the transistor.
5. The bus voltage detection circuit as set forth in any one of claims 2 to 4, wherein,
the power supply unit includes:
the anode of the first diode is connected with the synonym end of the power supply winding, the cathode of the first diode is connected with a power supply source, and the power supply unit is connected with the power supply winding when the first diode is configured to be conducted;
and the anode of the electrolytic capacitor is connected with the cathode of the first diode, and the cathode of the electrolytic capacitor is connected with the common terminal.
6. The bus voltage detection circuit of claim 5, wherein,
the power supply unit further includes:
a first filter capacitor connected in parallel with the electrolytic capacitor;
and a first resistor connected in parallel with the electrolytic capacitor.
7. The bus voltage detection circuit as set forth in any one of claims 2 to 4, wherein,
the sampling unit includes:
the anode of the second diode is connected with the same-name end of the power supply winding, the cathode of the second diode is connected with the voltage sampling end, and the sampling unit is connected with the sampling winding when the second diode is configured to be conducted;
and the input end of the filter circuit is connected with the cathode of the second diode, and the output end of the filter circuit is used for outputting the bus voltage.
8. The bus voltage detection circuit of claim 7, wherein,
the filter circuit includes:
the second resistor is connected between the homonymous end of the power supply winding and the anode of the second diode;
a third resistor connected in parallel with the second resistor;
the fourth resistor is connected between the cathode of the second diode and the voltage sampling end;
one end of the fifth resistor is connected between the fourth resistor and the voltage sampling end, and the other end of the fifth resistor is grounded;
a sixth resistor connected in parallel with the fifth resistor;
one end of the second filter capacitor is connected between the cathode of the second diode and the fourth resistor, and the other end of the second filter capacitor is grounded;
and one end of the third filter capacitor is connected between the fourth resistor and the voltage sampling end, and the other end of the third filter capacitor is grounded.
9. The bus voltage detection circuit of claim 7, wherein,
the controller also comprises a voltage sampling end which is connected with the output end of the filter circuit,
or alternatively, the process may be performed,
the bus voltage detection circuit further comprises a voltage detection chip, and a voltage sampling end of the voltage detection chip is connected with an output end of the filter circuit.
10. A circuit board, comprising: the bus voltage detection circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320996352.1U CN219957717U (en) | 2023-04-23 | 2023-04-23 | Bus voltage detection circuit and circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320996352.1U CN219957717U (en) | 2023-04-23 | 2023-04-23 | Bus voltage detection circuit and circuit board |
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| Publication Number | Publication Date |
|---|---|
| CN219957717U true CN219957717U (en) | 2023-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320996352.1U Active CN219957717U (en) | 2023-04-23 | 2023-04-23 | Bus voltage detection circuit and circuit board |
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| Country | Link |
|---|---|
| CN (1) | CN219957717U (en) |
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2023
- 2023-04-23 CN CN202320996352.1U patent/CN219957717U/en active Active
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