CN211826223U - Voltage isolation sampling circuit and electronic equipment - Google Patents
Voltage isolation sampling circuit and electronic equipment Download PDFInfo
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- CN211826223U CN211826223U CN201922395149.5U CN201922395149U CN211826223U CN 211826223 U CN211826223 U CN 211826223U CN 201922395149 U CN201922395149 U CN 201922395149U CN 211826223 U CN211826223 U CN 211826223U
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Abstract
The utility model relates to a voltage isolation detection area provides a voltage isolation sampling circuit and electronic equipment. The method comprises the following steps: the first end of the auxiliary power supply is used for receiving a direct current input voltage signal; the input end of the first signal processing circuit is electrically connected with the second end of the auxiliary power supply and is used for rectifying the isolated output voltage signal output by the auxiliary power supply, and carrying out proportional transformation on the rectified isolated output voltage signal to output a first isolated signal; the input end of the isolation circuit is electrically connected with the third end of the auxiliary power supply and is used for electrically isolating the driving signal output by the auxiliary power supply and outputting a second isolation signal; and the second signal processing circuit is respectively electrically connected with the output end of the first signal processing circuit and the output end of the isolation circuit and is used for obtaining a voltage isolation sampling signal according to the first isolation signal and the second isolation signal. The embodiment of the utility model provides a sampling is kept apart to voltage of broad scope has been realized.
Description
[ technical field ] A method for producing a semiconductor device
The embodiment of the utility model provides a voltage isolation detection area especially relates to a voltage isolation sampling circuit and electronic equipment.
[ background of the invention ]
In power electronic systems, isolated sampling of dc voltages is often required. The existing voltage isolation sampling circuit comprises a resistance voltage division circuit and an optical coupling isolation circuit, voltage division is carried out through the resistance voltage division circuit, and then the optical coupling in the optical coupling isolation circuit is adopted to carry out electrical isolation on the voltage signal after voltage division. However, the linear interval of the optical coupler is limited, so that the existing voltage isolation sampling circuit cannot meet the voltage isolation sampling in a wider range.
[ Utility model ] content
The embodiment of the utility model provides a aim at providing a voltage isolation sampling circuit and electronic equipment, its voltage isolation sampling that can realize the broad scope.
In order to solve the above technical problem, an embodiment of the present invention provides the following technical solution:
the embodiment of the utility model provides a voltage isolation sampling circuit, include:
an auxiliary power supply, a first end of the auxiliary power supply being configured to receive a direct current input voltage signal;
the input end of the first signal processing circuit is electrically connected with the second end of the auxiliary power supply and is used for rectifying an isolated output voltage signal output by the auxiliary power supply, and carrying out proportional transformation on the rectified isolated output voltage signal to output a first isolated signal;
the input end of the isolation circuit is electrically connected with the third end of the auxiliary power supply and is used for electrically isolating the driving signal output by the auxiliary power supply and outputting a second isolation signal;
and the second signal processing circuit is respectively electrically connected with the output end of the first signal processing circuit and the output end of the isolation circuit, and is used for obtaining a voltage isolation sampling signal of the direct current input voltage signal according to the first isolation signal and the second isolation signal, carrying out signal processing on the voltage isolation sampling signal, and executing preset operation according to the voltage isolation sampling signal after the signal processing.
Optionally, the first signal processing circuit comprises:
the rectifying circuit is electrically connected with the second end of the auxiliary power supply and is used for rectifying the isolated output voltage signal;
and the proportional conversion circuit is respectively electrically connected with the rectifying circuit and the second signal processing circuit and is used for carrying out proportional conversion on the rectified isolated output voltage signal, outputting a first isolated signal and sending the first isolated signal to the second signal processing circuit.
Optionally, the second signal processing circuit comprises:
and the division operation circuit is respectively electrically connected with the output end of the proportional conversion circuit and the output end of the isolation circuit and is used for dividing the first isolation signal and the second isolation signal, removing duty ratio information in the second isolation signal and obtaining a voltage isolation sampling signal of the direct current input voltage signal.
And the first digital signal processor is electrically connected with the division operation circuit and used for carrying out signal processing on the voltage isolation sampling signal and executing preset operation according to the voltage isolation sampling signal after the signal processing.
Optionally, the second processing circuit includes a second digital signal processor, configured to perform division on the first isolation signal and the second isolation signal, remove duty ratio information in the second isolation signal, obtain a voltage isolation sampling signal of the dc input voltage signal, perform signal processing on the voltage isolation sampling signal, and execute a preset operation according to the voltage isolation sampling signal after the signal processing.
Optionally, the auxiliary power supply comprises:
the isolation transformer comprises a primary winding and at least one secondary winding, wherein one end of the primary winding is used for receiving the direct current input voltage signal, one end of each secondary winding is used for outputting the isolation output voltage signal, and the other end of each secondary winding is used for grounding;
a first end of the switch circuit is electrically connected with the other end of the primary winding, and a second end of the switch circuit is grounded;
and the driving circuit is respectively electrically connected with the third end of the switching circuit and the input end of the isolating circuit and is used for outputting the driving signal, so that the switching circuit works in a conducting state or a switching-off state according to the driving signal, and the isolating transformer converts the direct-current input voltage signal into the isolated output voltage signal.
Optionally, the drive circuit comprises a PWM pulse generator or a microcontroller.
Optionally, the rectifier circuit comprises a half-wave rectifier circuit or a full-bridge rectifier circuit.
Optionally, the isolation circuit includes an optical coupling isolation circuit, an electromagnetic isolation circuit, or a capacitive isolation circuit.
Optionally, the voltage isolation sampling circuit further includes:
the first filter circuit is electrically connected between the first signal processing circuit and the second signal processing circuit and is used for filtering the first isolation signal;
and the second filter circuit is electrically connected between the isolation circuit and the second signal processing circuit and is used for filtering the second isolation signal.
The embodiment of the utility model provides an electronic equipment is still provided, include as above arbitrary any voltage isolation sampling circuit.
The utility model has the advantages that: compared with the prior art, the embodiment of the utility model provides a pair of voltage isolation sampling circuit and electronic equipment, do the rectification through first signal processing circuit to the isolation output voltage signal of auxiliary power supply output and handle, and linear regulation makes the isolation output voltage signal after the rectification is handled, export first isolated signal, then do the electrical isolation through the drive signal of isolation circuit to auxiliary power supply output and handle, export the second isolated signal, at last through second signal processing circuit according to first isolated signal and second isolated signal, obtain DC input voltage signal's voltage isolation sampling signal. Therefore, the voltage isolation sampling signal that obtains based on first isolation signal and second isolation signal is proportional relation with direct current input voltage signal, and the range of first isolation signal is adjustable, thereby, the embodiment of the utility model provides a can realize the voltage isolation sampling of broad scope.
[ description of the drawings ]
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of one of the voltage isolation sampling circuits according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of one of the voltage isolation sampling circuits according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of one of the voltage isolation sampling circuits according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of one of the voltage isolation sampling circuits provided in the embodiment of the present invention.
[ detailed description ] embodiments
To facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and detailed description. 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 intervening elements may be present. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
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 invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In addition, the technical features mentioned in the different embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.
An embodiment of the utility model provides an electronic equipment, including following circuit embodiment voltage isolation sampling circuit.
The electronic device is a device which is composed of electronic components such as an integrated circuit, a transistor, an electronic tube and the like, plays a role by applying an electronic technology (including software programming), comprises an electronic computer, a robot controlled by the electronic computer, a numerical control or program control system and the like, such as a computer, an air conditioner, a refrigerator, a washing machine, a microwave oven, a printer, a facsimile machine, an all-in-one machine, an electronic production device and the like.
The embodiment of the utility model provides a pair of electronic equipment, through voltage isolation sampling circuit can realize the voltage isolation sampling of broad scope.
Fig. 1 is a schematic structural diagram of a voltage isolation sampling circuit according to an embodiment of the present invention. As shown in fig. 1, the voltage isolation sampling circuit 100 includes an auxiliary power supply 10, a first signal processing circuit 20, an isolation circuit 30, and a second signal processing circuit 40.
The first end of the auxiliary power supply 10 is configured to receive a dc input voltage signal, the first end of the auxiliary power supply 10 is configured to output an isolated output voltage signal and is electrically connected to the first signal processing circuit 20, and the third end of the auxiliary power supply 10 is configured to output a driving signal and is electrically connected to the isolating circuit 30.
Referring to fig. 3 or fig. 4, the auxiliary power supply 10 includes an isolation transformer 101, a switching circuit 102, and a driving circuit 103.
The isolation transformer 101 includes a primary winding and at least one secondary winding, wherein one end of the primary winding is configured to receive the dc input voltage signal, one end of each secondary winding is configured to output the isolated output voltage signal, and the other end of each secondary winding is configured to be grounded.
The number of the first signal processing circuits 20 is the same as the number of the secondary windings, for example, when the number of the secondary windings is 2, the number of the first signal processing circuits 20 is also 2, and the isolated output voltage signals output by the corresponding secondary windings are respectively received.
It is understood that the isolation transformer 101 further includes a magnetic core (not shown), the primary winding is coupled to the secondary winding in a fixed ratio by the magnetic core, and the secondary winding is electrically isolated from the primary winding, i.e. the isolated output voltage signal is electrically isolated from the dc input voltage signal, and the ratio of the isolated output voltage signal to the dc input voltage signal varies with the ratio of the secondary winding to the primary winding.
The isolation transformer 101 includes a step-up transformer, a step-down transformer, a step-up and step-down transformer, a flyback transformer, or a forward transformer.
A first terminal of the switching circuit 102 is electrically connected to the other terminal of the primary winding, and a second terminal of the switching circuit 102 is grounded.
In the present embodiment, the switch circuit 102 includes a metal-oxide semiconductor field effect transistor, a bipolar transistor, and the like.
The driving circuit 103 is electrically connected to the third terminal of the switching circuit 102 and the input terminal of the isolation circuit 30, and is configured to output the driving signal, so that the switching circuit 102 operates in an on state or an off state according to the driving signal, and the isolation transformer 101 converts the dc input voltage signal into the isolated output voltage signal.
Wherein the driving circuit 103 comprises a PWM pulse generator or a microcontroller. The driving signal is a PWM pulse width modulation signal, which may be a fixed frequency pulse width modulation signal or a variable frequency pulse width modulation signal. It is to be understood that the present embodiment does not limit the type of the PWM pulse generator or the microcontroller.
Specifically, the PWM pulse width modulation signal is input to a gate of a metal-oxide semiconductor field effect transistor or a base of a bipolar transistor to drive the metal-oxide semiconductor field effect transistor to be turned on or off, or to drive the bipolar transistor to be turned on or off, and the switching circuit 102 modulates the dc input voltage signal input by the primary winding into a constant frequency voltage signal or a variable frequency voltage signal, and then couples the constant frequency voltage signal or the variable frequency voltage signal to the primary winding to obtain the isolated output voltage signal.
The input end of the first signal processing circuit 20 is electrically connected to the second end of the auxiliary power supply 10, and is configured to rectify the isolated output voltage signal output by the auxiliary power supply 10, perform scaling on the rectified isolated output voltage signal, and output a first isolated signal.
Referring to fig. 3 or fig. 4, the first signal processing circuit 20 includes a rectifying circuit 201 and a scaling circuit 202.
The rectifying circuit 201 is electrically connected to the second end of the auxiliary power supply 10, and is configured to rectify the isolated output voltage signal.
Wherein the rectifier circuit 201 comprises a half-wave rectifier circuit or a full-bridge rectifier circuit.
It can be understood that the dc input voltage signal is a dc voltage signal to be sampled, the isolated output voltage signal output by the secondary winding is coupled with dc voltage information of the dc input voltage signal, and the rectifier circuit 201 is adopted to rectify the dc voltage information coupled by the secondary winding.
The scaling circuit 202 is electrically connected to the rectifying circuit 201 and the second signal processing circuit 40, and is configured to perform scaling on the rectified isolated output voltage signal, output a first isolated signal, and send the first isolated signal to the second signal processing circuit 40.
Specifically, the scaling circuit 202 is configured to perform scaling on a voltage amplitude of the dc voltage information coupled to the secondary winding rectified by the rectifying circuit 201 to obtain the first isolation signal. It can be seen that the voltage amplitude of the first isolation signal is proportional to the voltage amplitude of the rectified isolated output voltage signal.
The input end of the isolation circuit 30 is electrically connected to the third end of the auxiliary power supply 10, and is configured to electrically isolate the driving signal output by the auxiliary power supply 10 and output a second isolated signal.
The isolation circuit 30 includes an optical coupling isolation circuit, an electromagnetic isolation circuit, or a capacitive isolation circuit.
Taking the example that the isolation circuit 30 includes an electromagnetic isolation circuit, the optical coupler isolation circuit includes an MOS transistor array, a capacitor array, an optoelectronic coupler array, a voltage stabilizing circuit, a voltage comparator, and a single chip. The MOS tube array comprises a first MOS tube and a second MOS tube; the capacitor array is electrically connected between the first MOS tube and the second MOS tube and is divided into two groups of capacitors; the photoelectric coupler array comprises a first photoelectric coupler and a second photoelectric coupler, the first photoelectric coupler is respectively and electrically connected with the first MOS tube, the second photoelectric coupler and the single chip microcomputer, and the second photoelectric coupler is also electrically connected with the second MOS tube; the voltage stabilizing circuit is electrically connected with the second MOS tube; the voltage comparator is respectively and electrically connected with the voltage stabilizing circuit and the single chip microcomputer.
Specifically, the voltage stabilizing circuit is configured to stabilize the output voltage of the second MOS transistor to a fixed value, the fixed value is used as a threshold voltage of the voltage comparator after voltage division, the output voltage is compared with the threshold voltage, if the output voltage is smaller than the threshold voltage, the single chip microcomputer is triggered to output the control signal, and the control signal is sent to the first photoelectric coupler and the second photoelectric coupler, so that the first photoelectric coupler and the second photoelectric coupler respectively control on and off of the first MOS transistor and the second MOS transistor, thereby controlling a working state of the photoelectric coupler array. Therefore, at the same time, one group of capacitors is guaranteed to supply power to the load, and the other group of capacitors is electrically connected with an external power supply to be charged, so that complete electromagnetic isolation of the input end and the output end is realized.
The second signal processing circuit 40 is electrically connected to the output terminal of the first signal processing circuit 20 and the output terminal of the isolation circuit 30, and configured to obtain a voltage isolation sampling signal of the dc input voltage signal according to the first isolation signal and the second isolation signal, perform signal processing on the voltage isolation sampling signal, and perform a preset operation according to the voltage isolation sampling signal after the signal processing.
Referring to fig. 3, the second signal processing circuit 40 includes a division circuit 401 and a first digital signal processor 402.
The division circuit 401 is electrically connected to the output end of the scaling circuit 202 and the output end of the isolation circuit 30, and is configured to divide the first isolation signal and the second isolation signal, remove duty ratio information in the second isolation signal, and obtain a voltage isolation sampling signal of the dc input voltage signal.
The division circuit 401 includes a resistor 1, a resistor 2, an operational amplifier, a resistor 3, and an analog multiplier. One end of the resistor 1 is used for receiving the first isolation signal, and the other end of the resistor 1 is connected with one end of the resistor 2 and the inverting input end of the operational amplifier; the other end of the resistor 2 is connected with the output end of the analog multiplier; the non-inverting input end of the operational amplifier is connected with one end of the resistor 3, and the output end of the operational amplifier is connected with the first input end of the analog multiplier; the other end of the resistor 3 is grounded; a second input of the analog multiplier is for receiving the second isolated signal.
It is understood that the division circuit 401 is not limited to the specific circuit form disclosed in the present embodiment.
The first digital signal processor 402 is electrically connected to the division circuit 401, and is configured to perform signal processing on the voltage isolation sampling signal, and execute a preset operation according to the voltage isolation sampling signal after the signal processing.
Referring to fig. 4, the second signal processing circuit 40 includes a second digital signal processor 403, configured to divide the first isolation signal and the second isolation signal, remove duty ratio information in the second isolation signal, obtain a voltage isolation sampling signal of the dc input voltage signal, perform signal processing on the voltage isolation sampling signal, and perform a preset operation according to the voltage isolation sampling signal after the signal processing.
In some embodiments, the first digital signal processor 402 and/or the second digital signal processor 403 may be replaced with a single chip, a general purpose processor, an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), an arm (acornrisc machine), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of these components; or any conventional processor, controller, microcontroller, or state machine; or as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
Please refer to fig. 2, which is a schematic structural diagram of one of the voltage isolation sampling circuits according to an embodiment of the present invention. As shown in fig. 2, the voltage isolation sampling circuit 200 includes the voltage isolation sampling circuit 100 according to the above embodiments, and please refer to the above embodiments for the same parts, which are not described in detail herein. The difference is that the voltage isolation sampling circuit 200 further includes a first filter circuit 50 and a second filter circuit 60.
The first filter circuit 50 is electrically connected between the first signal processing circuit 20 and the second signal processing circuit 40, and is configured to filter the first isolation signal.
The first filter circuit 50 is a low-pass filter composed of a resistor, a capacitor, and the like, and is configured to filter a ripple signal of the first isolation signal to obtain a dc component of the first isolation signal, so as to improve accuracy of a sampling result of the second signal processing circuit 40.
The second filter circuit 60 is electrically connected between the isolation circuit 30 and the second signal processing circuit 40, and is configured to filter the second isolation signal.
The second filter circuit 60 is a low-pass filter composed of a resistor, a capacitor, and the like, and is configured to filter out a ripple signal of the second isolation signal to obtain a dc component of the second isolation signal, so as to improve accuracy of a sampling result of the second signal processing circuit 40.
The embodiment of the utility model provides a pair of voltage isolation sampling circuit, do the rectification through the isolation output voltage signal of first signal processing circuit to auxiliary power supply output and handle, and the isolation output voltage signal after the rectification is handled is made in linear adjustment, output first isolated signal, then do the electrical isolation through the drive signal of isolation circuit to auxiliary power supply output and handle, output second isolated signal, finally according to first isolated signal and second isolated signal through second signal processing circuit, obtain DC input voltage signal's voltage isolation sampling signal. Therefore, the voltage isolation sampling signal that obtains based on first isolation signal and second isolation signal is proportional relation with direct current input voltage signal, and the range of first isolation signal is adjustable, thereby, the embodiment of the utility model provides a can realize the voltage isolation sampling of broad scope.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments can be combined, steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. A voltage isolation sampling circuit, comprising:
an auxiliary power supply, a first end of the auxiliary power supply being configured to receive a direct current input voltage signal;
the input end of the first signal processing circuit is electrically connected with the second end of the auxiliary power supply and is used for rectifying an isolated output voltage signal output by the auxiliary power supply, and carrying out proportional transformation on the rectified isolated output voltage signal to output a first isolated signal;
the input end of the isolation circuit is electrically connected with the third end of the auxiliary power supply and is used for electrically isolating the driving signal output by the auxiliary power supply and outputting a second isolation signal;
and the second signal processing circuit is respectively electrically connected with the output end of the first signal processing circuit and the output end of the isolation circuit, and is used for obtaining a voltage isolation sampling signal of the direct current input voltage signal according to the first isolation signal and the second isolation signal, carrying out signal processing on the voltage isolation sampling signal, and executing preset operation according to the voltage isolation sampling signal after the signal processing.
2. The voltage isolation sampling circuit of claim 1, wherein the first signal processing circuit comprises:
the rectifying circuit is electrically connected with the second end of the auxiliary power supply and is used for rectifying the isolated output voltage signal;
and the proportional conversion circuit is respectively electrically connected with the rectifying circuit and the second signal processing circuit and is used for carrying out proportional conversion on the rectified isolated output voltage signal, outputting a first isolated signal and sending the first isolated signal to the second signal processing circuit.
3. The voltage isolation sampling circuit of claim 2, wherein the second signal processing circuit comprises:
the division operation circuit is respectively electrically connected with the output end of the proportional conversion circuit and the output end of the isolation circuit and is used for dividing the first isolation signal and the second isolation signal, removing duty ratio information in the second isolation signal and obtaining a voltage isolation sampling signal of the direct current input voltage signal;
and the first digital signal processor is electrically connected with the division operation circuit and used for carrying out signal processing on the voltage isolation sampling signal and executing preset operation according to the voltage isolation sampling signal after the signal processing.
4. The isolated voltage sampling circuit of claim 2, wherein the second signal processing circuit comprises a second digital signal processor, configured to divide the first isolated signal by the second isolated signal, remove duty cycle information from the second isolated signal, obtain an isolated voltage sampling signal of the dc input voltage signal, perform signal processing on the isolated voltage sampling signal, and perform a preset operation according to the signal-processed isolated voltage sampling signal.
5. The voltage isolation sampling circuit of claim 1, wherein the auxiliary power supply comprises:
the isolation transformer comprises a primary winding and at least one secondary winding, wherein one end of the primary winding is used for receiving the direct current input voltage signal, one end of each secondary winding is used for outputting the isolation output voltage signal, and the other end of each secondary winding is used for grounding;
a first end of the switch circuit is electrically connected with the other end of the primary winding, and a second end of the switch circuit is grounded;
and the driving circuit is respectively electrically connected with the third end of the switching circuit and the input end of the isolating circuit and is used for outputting the driving signal, so that the switching circuit works in a conducting state or a switching-off state according to the driving signal, and the isolating transformer converts the direct-current input voltage signal into the isolated output voltage signal.
6. The voltage isolation sampling circuit of claim 5, wherein the drive circuit comprises a PWM pulse generator or a microcontroller.
7. The voltage isolation sampling circuit of claim 2, wherein the rectifying circuit comprises a half-wave rectifying circuit or a full-bridge rectifying circuit.
8. The voltage isolation sampling circuit of claim 1, wherein the isolation circuit comprises an opto-coupler isolation circuit, an electromagnetic isolation circuit, or a capacitive isolation circuit.
9. The voltage isolation sampling circuit of any one of claims 1-8, wherein the voltage isolation sampling circuit further comprises:
the first filter circuit is electrically connected between the first signal processing circuit and the second signal processing circuit and is used for filtering the first isolation signal;
and the second filter circuit is electrically connected between the isolation circuit and the second signal processing circuit and is used for filtering the second isolation signal.
10. An electronic device comprising a voltage isolation sampling circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201922395149.5U CN211826223U (en) | 2019-12-26 | 2019-12-26 | Voltage isolation sampling circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922395149.5U CN211826223U (en) | 2019-12-26 | 2019-12-26 | Voltage isolation sampling circuit and electronic equipment |
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| CN211826223U true CN211826223U (en) | 2020-10-30 |
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