CN217954546U - Isolated direct current bus voltage detection circuit of communication power supply - Google Patents
Isolated direct current bus voltage detection circuit of communication power supply Download PDFInfo
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- CN217954546U CN217954546U CN202221976523.6U CN202221976523U CN217954546U CN 217954546 U CN217954546 U CN 217954546U CN 202221976523 U CN202221976523 U CN 202221976523U CN 217954546 U CN217954546 U CN 217954546U
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Abstract
The utility model relates to a communication power supply isolated DC bus voltage detection circuit, including input differential amplifier circuit, keep apart transmission amplifier circuit, output differential amplifier circuit, primary constant voltage power supply circuit and secondary constant voltage power supply circuit, DC bus voltage signal inserts input differential amplifier circuit's signal input part, input differential amplifier circuit, keep apart transmission amplifier circuit and output differential amplifier circuit and establish ties in order, primary constant voltage power supply circuit is connected with output differential amplifier circuit and isolation transmission amplifier circuit electricity respectively, secondary constant voltage power supply circuit is connected with input differential amplifier circuit and isolation transmission amplifier circuit electricity respectively. The direct current bus voltage signal carries out 1 proportion isolated accurate transmission after the shaping step-down and difference comparison amplify, enlargies the restoration in proportion at last to direct current bus voltage analog output, primary constant voltage power supply circuit and secondary constant voltage power supply circuit provide constant voltage power supply respectively, and whole circuit has better isolation performance, and it is high to detect the precision.
Description
Technical Field
The utility model relates to an electronic circuit technical field especially relates to a communication power supply isolated DC bus voltage detection circuitry.
Background
The direct current bus voltage detection in the high-frequency switch rectifier module of the existing communication power supply system is one of important links of a whole module circuit, and the accuracy of a detection signal directly influences the safe and efficient operation of the rectifier module. Because the direct current bus voltage signal participates in the primary control mode of the module circuit, the direct current bus voltage analog quantity detection signal needs to be sent to a CPU chip of the rectifier module primary circuit for processing in an isolation mode, the accuracy index of the output direct current bus voltage is required to be higher and higher, the rectifier output voltage is kept stable, and overvoltage and undervoltage phenomena do not occur. The newly designed isolated direct current bus voltage detection circuit has the characteristics of strong isolation performance, high precision, stable power supply and the like. The existing common voltage analog quantity detection circuit cannot realize the above functions, so that a communication power supply isolation type direct current bus voltage accurate detection circuit needs to be designed to meet the requirements.
Disclosure of Invention
The utility model aims to solve the technical problem that to the not enough of above-mentioned prior art, a communication power supply isolated DC bus voltage detection circuit is provided.
The utility model provides an above-mentioned technical problem's technical scheme as follows: a communication power supply isolation type direct current bus voltage detection circuit comprises an input differential amplification circuit, an isolation transmission amplification circuit, an output differential amplification circuit, a primary stabilized voltage power supply circuit and a secondary stabilized voltage power supply circuit, wherein a direct current bus voltage signal is connected to a signal input end of the input differential amplification circuit, a signal output end of the input differential amplification circuit is electrically connected with a signal input end of the isolation transmission amplification circuit, a signal output end of the isolation transmission amplification circuit is electrically connected with a signal input end of the output differential amplification circuit, a signal output end of the output differential amplification circuit outputs direct current bus voltage analog quantity, the primary stabilized voltage power supply circuit is respectively electrically connected with a power input end of the output differential amplification circuit and a power input end of the isolation transmission amplification circuit, and the secondary stabilized voltage power supply circuit is respectively electrically connected with the power input end of the input differential amplification circuit and the other power input end of the isolation transmission amplification circuit.
The utility model has the advantages that: the utility model discloses a communication power supply isolated DC bus voltage detection circuit, DC bus voltage signal process after input differential amplifier circuit plastic step-down and difference comparison amplify, by keep apart transmission amplifier circuit and carry out 1 proportion isolated accurate transmission to voltage signal, pass through at last output differential amplifier circuit reduces in proportion to send DC bus voltage analog quantity to module primary circuit CPU chip and carry out data processing, primary constant voltage power supply circuit and secondary constant voltage power supply circuit provide constant voltage power supply for whole detection circuitry's primary part and secondary part respectively, and whole circuit has better isolation performance, and it is high to detect the precision.
Drawings
Fig. 1 is a schematic diagram of a circuit structure of a communication power supply isolated dc bus voltage detection circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of an input differential amplifier according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of an isolated transmission amplifying circuit and an output differential amplifying circuit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a secondary regulated power supply circuit according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a primary voltage-stabilized power supply circuit according to an embodiment of the present invention.
Detailed Description
The principles and features of the present invention are described below in conjunction with the following drawings, the examples given are only intended to illustrate the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, a communication power supply isolated dc bus voltage detection circuit includes an input differential amplifier circuit, an isolated transmission amplifier circuit, an output differential amplifier circuit, a primary regulated power supply circuit, and a secondary regulated power supply circuit, where a dc bus voltage signal is connected to a signal input terminal of the input differential amplifier circuit, a signal output terminal of the input differential amplifier circuit is electrically connected to a signal input terminal of the isolated transmission amplifier circuit, a signal output terminal of the isolated transmission amplifier circuit is electrically connected to a signal input terminal of the output differential amplifier circuit, a signal output terminal of the output differential amplifier circuit outputs a dc bus voltage analog quantity, the primary regulated power supply circuit is electrically connected to a power input terminal of the output differential amplifier circuit and one power input terminal of the isolated transmission amplifier circuit, and the secondary regulated power supply circuit is electrically connected to a power input terminal of the input differential amplifier circuit and the other power input terminal of the isolated transmission amplifier circuit.
The utility model discloses a communication power supply isolated DC bus voltage detection circuit, DC bus voltage signal process after input differential amplifier circuit plastic step-down and difference comparison amplify, by keep apart transmission amplifier circuit and carry out 1 proportion isolated accurate transmission to voltage signal, pass through at last output differential amplifier circuit reduces in proportion to send DC bus voltage analog quantity to module primary circuit CPU chip and carry out data processing, primary constant voltage power supply circuit and secondary constant voltage power supply circuit provide constant voltage power supply for whole detection circuitry's primary part and secondary part respectively, and whole circuit has better isolation performance, and it is high to detect the precision.
As shown in fig. 2, in one or more embodiments of the present invention, the input differential amplifying circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, and an operational amplifier U1, a dc bus voltage signal is connected to one end of the resistor R1, one end of the resistor R1 is connected to a secondary ground through the capacitor C2, the resistor R2 and the resistor R4 are sequentially connected in series between the other end of the resistor R1 and a non-inverting input end of the operational amplifier U1, a common end of the resistor R2 and the resistor R4 is connected to the secondary ground through the resistor R3, the capacitor C1 is electrically connected between the common end of the resistor R2 and the resistor R4 and one end of the resistor R1, the resistor R6 and the capacitor C3 are connected in parallel between the non-inverting input end and the secondary ground of the operational amplifier U1, the resistor R5 and the resistor R7 are sequentially connected in series between the non-inverting input end and the inverting input end of the operational amplifier U1, the common end of the resistor R5 and the resistor R7 is electrically connected with one power supply output end of the secondary voltage-stabilized power supply circuit, the inverting input end of the operational amplifier U1 is connected with the secondary ground through the resistor R8, the capacitor C4 and the resistor R9 are connected in parallel between the inverting input end and the output end of the operational amplifier U1, the positive power supply input end of the operational amplifier U1 is electrically connected with +12V of an external power supply, the positive power supply input end of the operational amplifier U1 is connected with the secondary ground through the capacitor C5, the negative power supply input end of the operational amplifier U1 is connected with the secondary ground, and the output end of the operational amplifier U1 is electrically connected with the signal input end of the isolation transfer amplifying circuit. After the input differential amplifying circuit is used for shaping, voltage reduction and 1.75 proportion high-precision differential comparison amplification, the 54V direct current bus voltage signal of the rectifier module is converted into a 1.8V direct current voltage signal.
Here, the operational amplifier U1 adopts an operational amplifier chip with a model LM258, and is characterized in that: low disorder: 5mV/MAX; low input bias current: 3nA; low temperature shift of Vio: 7 mV/DEG C; wide supply voltage range: -0.3V to ± 32V; temperature range: -25 ℃ to +85 ℃.
As shown in fig. 3, in one or more embodiments of the present invention, the isolation transmission amplifying circuit includes a resistor R10, a capacitor C6, a capacitor C7, a capacitor C8 and an optical isolation amplifier U2, the output end of the input differential amplifying circuit passes through the resistor R10 and is electrically connected to the positive input end of the optical isolation amplifier U2, the positive input end of the optical isolation amplifier U2 passes through the capacitor C6 and is connected to the secondary ground, the negative input end and the input side ground of the optical isolation amplifier U2 are connected to the secondary ground, the input side power supply end of the optical isolation amplifier U2 is electrically connected to another power output end of the secondary voltage-stabilized power supply circuit, the input side power supply end of the optical isolation amplifier U2 passes through the capacitor C7 and is connected to the secondary ground, the output side power supply end of the optical isolation amplifier U2 is electrically connected to +5VP, the output side power supply end of the optical isolation amplifier U2 passes through the capacitor C8 and is connected to the primary ground, the output side ground of the optical isolation amplifier U2 is connected to the primary ground, the positive output end and the negative output end of the optical isolation amplifier U2 are respectively electrically connected to the positive input end and the negative output end of the optical isolation amplifier U2. 1, 1 proportion isolation type accurate transmission is carried out on a 1.8V direct-current voltage signal through an optical isolation amplifier U2, so that input and output voltage signals are completely consistent.
Here, the opto-isolator amplifier U2 employs a model ACPL-C87H voltage sensor chip that is an opto-isolator amplifier designed specifically for voltage sensing, with a voltage input range of 0-2V and a high input impedance of 1G Ω making it well suited for isolated voltage sensing requirements in electronic power converter applications, including communication power systems. In a typical voltage sensing implementation, a resistive divider is used to scale the dc bus voltage to fit the input range of the voltage sensor, producing a differential output voltage on the other side of the sensor that is proportional to the input voltage. The voltage sensor chip with the model ACPL-C87H has +/-1% gain tolerance, is powered by a 5V single power supply, and has excellent linearity; a high level active turn-off pin is also provided to reduce the IDD1 current to 15us, making it suitable for battery powered and other power consumption sensitive applications; the high common-mode transient immunity (15 kV/s) is also provided, and the precision and stability required for accurately monitoring the direct-current bus voltage in a high-noise environment are provided; by combining an excellent optical coupling technology, sigma-delta (Z-A) modulation, a chopper-stabilized amplifier and differential output are adopted, and isolation mode noise suppression, low offset, high gain precision and stability are provided; adopts a compact and automatically-inserted stretching SO-8 (SSO-8) package, and conforms to the global regulatory safety standard.
As shown in fig. 3, in one or more embodiments of the present invention, the output differential amplifying circuit includes a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C12, a diode D1, and an operational amplifier U3, the positive output terminal of the isolation transfer amplifying circuit is electrically connected to the non-inverting input terminal of the operational amplifier U3 through the resistor R12, the resistor R13 and the capacitor C9 are connected in parallel between the non-inverting input terminal of the operational amplifier U3 and the primary ground, the negative output terminal of the isolation transfer amplifying circuit is electrically connected to the inverting input terminal of the operational amplifier U3 through the resistor R11, the capacitor C10 and the resistor R14 are connected in parallel between the inverting input terminal and the output terminal of the operational amplifier U3, the positive power input terminal of the operational amplifier U3 is electrically connected to a VP +5 of an external power supply, the positive power input terminal of the operational amplifier U3 is electrically connected to the primary ground through the capacitor C11, the negative power input terminal of the operational amplifier U1 is electrically connected to the external power supply-5, the negative power supply connection point of the operational amplifier U3 is electrically connected to the VP, the negative power supply input terminal of the operational amplifier U3 is electrically connected to the primary power supply, the negative power supply terminal of the operational amplifier U1 is electrically connected to the intermediate diode D1, the negative power supply output terminal of the operational amplifier U3 is electrically connected to the primary output terminal of the operational amplifier U1, the intermediate diode D1, and the operational amplifier U3, and the dc output terminal of the operational amplifier U1 is electrically connected to the diode D1, and the dc output terminal of the operational amplifier U1, and the primary output terminal of the analog dc output terminal of the operational amplifier U1, and the analog output terminal of the analog diode D1, and the analog output terminal of the analog dc output terminal of the operational amplifier U1. The operational amplifier U3 is adopted to amplify and restore the voltage analog quantity of the direct current bus into 2.5V in proportion, the voltage analog quantity is sent to a module primary circuit CPU chip for data processing, and the diode D1 can play a role in outputting a voltage signal for clamping.
Here, the operational amplifier U3 is also an operational amplifier chip with a model LM 258.
As shown in fig. 4, in one or more embodiments of the present invention, the secondary voltage-stabilized power supply circuit includes a resistor R16, a resistor R17, a capacitor C13, a capacitor C14, a capacitor C15, a voltage-stabilized power supply U4 and a reference power supply U6, one end of the resistor R16 is +12V from an external power supply, the resistor R17 and the capacitor C15 are connected in series between the other end of the resistor R16 and the ground, a common end of the resistor R17 and the capacitor C15 is electrically connected to a power input end of the input differential amplification circuit as an output end, a common end of the resistor R17 and the capacitor C15 is electrically connected to a feedback end of the reference power supply U6, an anode of the reference power supply U6 is connected to the secondary ground, a cathode of the reference power supply U6 is electrically connected to a common end of the resistor R17 and the capacitor C15, an input end of the voltage-stabilized power supply U4 is electrically connected to the external power supply +12V, an input end of the voltage-stabilized power supply U4 is connected to the secondary ground through the capacitor C13, a ground, an output end of the voltage-stabilized power supply U4 is electrically connected to the power supply output end, and an input end of the voltage-stabilized power supply U4 is electrically connected to the power supply circuit is electrically connected to the secondary power supply. The voltage stabilizing source U4 can convert the external +12V power supply voltage into +5V voltage, and the reference source U6 is matched with the resistor R16 and the resistor R17 to convert the external +12V power supply voltage into +2.5V voltage, so that a stable power supply is provided for the input differential amplifying circuit and the isolation transmission amplifying circuit.
Here, the voltage-stabilizing source U4 is AN existing chip of type AZ1117H-5.0TRE1, and the reference source U6 is AN existing chip of type AZ431AN-ATRE 1.
As shown in fig. 5, in one or more embodiments of the present invention, the primary voltage-stabilized power supply circuit includes a capacitor C16, a capacitor C17 and a voltage-stabilized power supply U5, an input terminal of the voltage-stabilized power supply U5 is electrically connected to +5VP of an external power supply, an input terminal of the voltage-stabilized power supply U5 is connected to a primary ground through the capacitor C16, a ground terminal of the voltage-stabilized power supply U5 is connected to the primary ground, an output terminal of the voltage-stabilized power supply U5 is connected to the primary ground through the capacitor C17, and an output terminal of the voltage-stabilized power supply U5 is electrically connected to a power input terminal of the output differential amplifying circuit. Through the voltage stabilizing source U5, the voltage of an external +5VP power supply can be converted into 3.3V voltage, so that a stable power supply is provided for the output differential amplifying circuit. Here, the regulator U5 is an existing chip of type AZ 1117D-3.3E1.
In the embodiment of the present invention, the secondary power supply +5V is generated and outputted by the secondary voltage-stabilized power supply circuit, and the primary power supply +/-5VP and the secondary power supply +12V are generated and outputted after being isolated by the external power supply.
The utility model discloses a communication power supply isolated DC bus voltage detection circuit, isolation performance is strong, the precision is high, the power supply is stable, and circuit technical index reaches the communication power supply DC bus voltage detection technical requirement of national regulation to the wide application is in communication power supply system high frequency switch rectifier module actual circuit.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (6)
1. The isolated direct current bus voltage detection circuit for the communication power supply is characterized by comprising an input differential amplification circuit, an isolated transmission amplification circuit, an output differential amplification circuit, a primary voltage-stabilized power supply circuit and a secondary voltage-stabilized power supply circuit, wherein a direct current bus voltage signal is connected to a signal input end of the input differential amplification circuit, a signal output end of the input differential amplification circuit is electrically connected with a signal input end of the isolated transmission amplification circuit, a signal output end of the isolated transmission amplification circuit is electrically connected with a signal input end of the output differential amplification circuit, a signal output end of the output differential amplification circuit outputs a direct current bus voltage analog quantity, the primary voltage-stabilized power supply circuit is respectively electrically connected with a power input end of the output differential amplification circuit and one power input end of the isolated transmission amplification circuit, and the secondary voltage-stabilized power supply circuit is respectively electrically connected with a power input end of the input differential amplification circuit and the other power input end of the isolated transmission amplification circuit.
2. The isolated dc bus voltage detection circuit of claim 1, wherein: the input differential amplifying circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5 and an operational amplifier U1, a direct-current bus voltage signal is connected to one end of the resistor R1, one end of the resistor R1 is connected with a secondary ground through the capacitor C2, the resistor R2 and the resistor R4 are sequentially connected in series between the other end of the resistor R1 and the non-inverting input end of the operational amplifier U1, the common end of the resistor R2 and the resistor R4 is connected with a secondary ground through the resistor R3, the capacitor C1 is electrically connected between the common end of the resistor R2 and the resistor R4 and one end of the resistor R1, the resistor R6 and the capacitor C3 are connected in parallel between the non-inverting input end of the operational amplifier U1 and the secondary ground, the resistor R5 and the resistor R7 are sequentially connected in series between the non-inverting input end and the inverting input end of the operational amplifier U1, and the common end of the resistor R5 and the resistor R7 is electrically connected with one power supply output end of the secondary stabilized voltage power supply circuit, the inverting input end of the operational amplifier U1 is connected with the secondary ground through the resistor R8, the capacitor C4 and the resistor R9 are connected in parallel between the inverting input end and the output end of the operational amplifier U1, the positive power supply input end of the operational amplifier U1 is electrically connected with an external power supply +12V, the positive power supply input end of the operational amplifier U1 is connected with the secondary ground through the capacitor C5, the negative power supply input end of the operational amplifier U1 is connected with the secondary ground, and the output end of the operational amplifier U1 is electrically connected with the signal input end of the isolation transfer amplifying circuit.
3. The communication power supply isolation type direct current bus voltage detection circuit as claimed in claim 1, wherein the isolation transmission amplifying circuit comprises a resistor R10, a capacitor C6, a capacitor C7, a capacitor C8 and an optical isolation amplifier U2, the output terminal of the input differential amplifying circuit is electrically connected with the positive input terminal of the optical isolation amplifier U2 through the resistor R10, the positive input terminal of the optical isolation amplifier U2 is connected with a secondary ground through the capacitor C6, the negative input terminal and the input terminal ground of the optical isolation amplifier U2 are connected with a secondary ground, the input terminal power supply terminal of the optical isolation amplifier U2 is electrically connected with the other power output terminal of the secondary voltage-stabilized power supply circuit, the input terminal power supply terminal of the optical isolation amplifier U2 is connected with the secondary ground through the capacitor C7, the output terminal power supply terminal of the optical isolation amplifier U2 is electrically connected with an external power supply +5VP, the output terminal power supply terminal of the optical isolation amplifier U2 is connected with a primary ground through the capacitor C8, the output terminal ground of the optical isolation amplifier U2 is connected with a primary ground, and the positive output terminal and the negative output terminal of the optical isolation amplifier U2 are electrically connected with the positive input terminal and the negative input terminal of the differential amplifying circuit respectively.
4. The communication power supply isolation type direct current bus voltage detection circuit according to claim 1, wherein the output differential amplification circuit comprises a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C12, a diode D1 and an operational amplifier U3, a positive output end of the isolation transfer amplification circuit is electrically connected with a non-inverting input end of the operational amplifier U3 through the resistor R12, the resistor R13 and the capacitor C9 are connected in parallel between the non-inverting input end and a primary ground of the operational amplifier U3, a negative output end of the isolation transfer amplification circuit is electrically connected with a non-inverting input end of the operational amplifier U3 through the resistor R11, the capacitor C10 and the resistor R14 are connected in parallel between the non-inverting input end and an output end of the operational amplifier U3, a positive power supply input end of the operational amplifier U3 is electrically connected with an external power supply VP 5, a positive power supply input end of the operational amplifier U3 is electrically connected with the primary ground through the capacitor C11, a negative power supply input end of the operational amplifier U1 is electrically connected with a negative power supply-5, the operational amplifier U3 is electrically connected with a negative power supply input end of the operational amplifier U1 through a negative power supply, a negative power supply connection point of the operational amplifier U1 is electrically connected with an output terminal of the operational amplifier U1, a negative power supply of the operational amplifier U3 is electrically connected with an intermediate diode D1, and a negative output terminal of the operational amplifier U1 is electrically connected with an output terminal of the diode D1, and a negative output terminal of the operational amplifier U3, and a diode D1 is electrically connected with a diode D1, and a negative output terminal of the primary output terminal of the operational amplifier U1, and a diode D1.
5. The communication power supply isolation type direct current bus voltage detection circuit according to any one of claims 1 to 4, wherein the secondary voltage stabilization power supply circuit comprises a resistor R16, a resistor R17, a capacitor C13, a capacitor C14, a capacitor C15, a voltage stabilization power supply U4 and a reference power supply U6, one end of the resistor R16 is connected with +12V of an external power supply, the resistor R17 and the capacitor C15 are connected between the other end of the resistor R16 and the ground in series, a common end of the resistor R17 and the capacitor C15 serves as an output end and is electrically connected with one power supply input end of the input differential amplification circuit, a common end of the resistor R17 and the capacitor C15 is electrically connected with a feedback end of the reference power supply U6, an anode of the reference power supply U6 is connected with a secondary ground, a cathode of the reference power supply U6 is electrically connected with a common end of the resistor R17 and the capacitor C15, an input end of the voltage stabilization power supply U4 is electrically connected with +12V of the external power supply, an input end of the voltage stabilization power supply U4 is connected with the secondary ground through the capacitor C13, an output end of the voltage stabilization power supply U4 is electrically connected with a power supply output end, and an input end of the voltage stabilization power supply is electrically connected with the voltage stabilization power supply output end of the voltage stabilization power supply circuit, and an input end of the voltage stabilization power supply circuit is electrically connected with the secondary power supply circuit.
6. The communication power supply isolation type direct current bus voltage detection circuit according to any one of claims 1 to 4, wherein the primary voltage stabilizing power supply circuit comprises a capacitor C16, a capacitor C17 and a voltage stabilizing source U5, the input end of the voltage stabilizing source U5 is electrically connected with an external power supply +5VP, the input end of the voltage stabilizing source U5 is connected with a primary ground through the capacitor C16, the ground end of the voltage stabilizing source U5 is connected with the primary ground, the output end of the voltage stabilizing source U5 is connected with the primary ground through the capacitor C17, and the output end of the voltage stabilizing source U5 is electrically connected with one power supply input end of the output differential amplification circuit.
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| CN202221976523.6U CN217954546U (en) | 2022-07-29 | 2022-07-29 | Isolated direct current bus voltage detection circuit of communication power supply |
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| CN202221976523.6U CN217954546U (en) | 2022-07-29 | 2022-07-29 | Isolated direct current bus voltage detection circuit of communication power supply |
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| CN202221976523.6U Active CN217954546U (en) | 2022-07-29 | 2022-07-29 | Isolated direct current bus voltage detection circuit of communication power supply |
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