CN110995007B - Isolated high-low voltage conversion self-holding circuit - Google Patents
Isolated high-low voltage conversion self-holding circuit Download PDFInfo
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- CN110995007B CN110995007B CN201911204416.4A CN201911204416A CN110995007B CN 110995007 B CN110995007 B CN 110995007B CN 201911204416 A CN201911204416 A CN 201911204416A CN 110995007 B CN110995007 B CN 110995007B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33515—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with digital control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
Abstract
An isolated high-low voltage conversion self-holding circuit comprises an overload detection circuit, an isolated self-holding circuit, a high-voltage conversion isolation feedback circuit, an AD conversion circuit, a dynamic switch isolation circuit, a controller circuit and a 1553B communication interface circuit, wherein the control of a first-stage MOS tube switch of the high-voltage conversion isolation feedback circuit is realized through the overload detection circuit and the isolated self-holding circuit, a control signal is sent out through the controller, the dynamic switch isolation circuit is controlled to realize the control of another-stage MOS tube switch of the high-voltage conversion isolation feedback circuit, the problem that the structure and the control means of the traditional high-low voltage conversion circuit are relatively simple is solved, and the problem that no state feedback exists is solved by adding the 1553B communication interface circuit.
Description
Technical Field
The invention relates to an isolated high-low voltage conversion self-holding circuit, and belongs to the technical field of voltage conversion.
Background
The high-low voltage conversion circuit is widely applied to the fields of power conversion, energy storage and high-voltage discharge. The conversion from low DC voltage to high DC voltage can be realized by forward or flyback transformer in combination with certain peripheral circuit. The traditional high-low voltage conversion circuit is relatively simple and is mainly realized by discrete components such as a transformer, an MOS (metal oxide semiconductor) tube and the like. Meanwhile, the control of low-voltage to high-voltage conversion is relatively simple, closed-loop control is not realized after the low-voltage is converted into the high-voltage, the state of high-voltage and low-voltage conversion is not fed back in real time, the proportional coefficient of the high-voltage and low-voltage conversion is fixed, flexible adjustment cannot be realized, and the specific numerical value of the high-voltage conversion is obtained.
Disclosure of Invention
The technical problem solved by the invention is as follows: aiming at the problems that the traditional high-low voltage conversion circuit is relatively simple in the prior art, the traditional high-low voltage conversion circuit is mainly realized through discrete components such as a transformer and an MOS (metal oxide semiconductor) tube, the state of high-low voltage conversion is not fed back in real time and the like, an isolation type high-low voltage conversion self-holding circuit is provided.
The technical scheme for solving the technical problems is as follows:
an isolated high-low voltage conversion self-holding circuit comprises an overload detection circuit, an isolated self-holding circuit, a high-voltage conversion isolation feedback circuit, an AD conversion circuit, a dynamic switch isolation circuit, a controller circuit and a 1553B communication interface circuit, wherein:
overload detection circuit: detecting an environmental overload value, comparing the overload value with a preset environmental overload value, if the circuit environmental overload value is greater than or equal to the preset environmental overload value, outputting a low level signal to the isolation self-protection circuit, and if the circuit environmental overload value is less than the preset environmental overload value, outputting a high level signal to the isolation self-protection circuit and sending environmental overload information to the AD conversion circuit;
isolation self-protection circuit: controlling the conduction condition of a P-channel MOS tube of the high-voltage transformation isolation feedback circuit according to a level signal sent by the overload detection circuit, and if the overload detection circuit outputs a high level signal, outputting the high level signal to the high-voltage transformation isolation feedback circuit, wherein the P-channel MOS tube is in a cut-off state; if the overload detection circuit outputs a low level signal, the overload detection circuit outputs a low level signal to the high-voltage transformation isolation feedback circuit, and the P-channel MOS tube is in a conducting state;
1553B communication interface circuit: receiving state data of each part of circuit fed back by the controller circuit, sending the state data to an external system, receiving a control signal sent by the external system, and forwarding the control signal to the controller circuit;
a controller circuit: receiving a control signal and sending a high level or low level signal to the dynamic switch isolation circuit; the result of the AD conversion circuit is read, and the environmental overload value and the state of the high-voltage conversion isolation feedback circuit are judged in real time; when the high voltage of the high voltage transformation isolation feedback circuit reaches a certain value, the dynamic switch isolation circuit always sends a low level signal, and the conversion process of the low voltage to the high voltage is stopped; when the high voltage of the high-voltage transformation isolation feedback circuit is judged to be lower than a certain value, a signal for switching high and low levels is sent to the dynamic switch isolation circuit, and the conversion process of low voltage to high voltage is started until the high voltage reaches a preset value;
dynamic switch isolation circuit: controlling the conduction condition of an N-channel MOS tube of the high-voltage transformation isolation feedback circuit according to a level signal sent by the controller circuit, and if the controller circuit outputs a low level signal, outputting the low level signal to the high-voltage transformation isolation feedback circuit, wherein the N-channel MOS tube is in a cut-off state; if the controller circuit outputs a high level signal, the high level signal is output to the high-voltage conversion isolation feedback circuit, the N-channel MOS tube is in a conducting state, and when the controller circuit outputs a signal to switch the high level signal and the low level signal, the N-channel MOS tube is in a stopping state and the conducting state and is continuously switched;
high-voltage transformation isolation feedback circuit: receiving level signals output by an isolation self-protection circuit and a dynamic switch isolation circuit, controlling the tubular states of a P-channel MOS tube and an N-channel MOS tube according to the obtained level signals, conducting the P-channel MOS tube when high-voltage conversion is needed, switching the N-channel MOS tube between a cut-off state and a conducting state, converting and charging output voltage in a high-voltage conversion isolation feedback circuit, and sending voltage state information to an AD conversion circuit;
an AD conversion circuit: the environment overload information of the overload detection circuit and the voltage state information of the high-voltage transformation isolation feedback circuit are collected respectively and are sent to an external system through a 1553B communication interface circuit.
The isolation self-protection circuit comprises an optical MOS relay D1, a peripheral resistor R1, a peripheral resistor R2, a peripheral resistor R3 and a peripheral resistor R4, wherein the input end of the optical MOS relay D1 is connected with the output end of the overload detection circuit, the connection or disconnection of the input end of the optical MOS relay D1 is realized by combining the state of the output end of the overload detection circuit after the current is limited through the peripheral resistor R1 and the peripheral resistor R2, two switches at the output end of the optical MOS relay D1 output a control signal of a first-stage MOS tube switch of the high-voltage transformation isolation feedback circuit after voltage division is carried out through the peripheral resistor R3 and the peripheral resistor R4, the switch combination is closed when receiving a low-level signal output by the overload detection circuit, the low-level signal is output to a P-channel MOS tube of the high-voltage transformation isolation feedback circuit, and the low-level signal is fed back to the input end of the optical MOS relay D1, so that the state self-protection of the isolation circuit is realized.
The overload detection circuit comprises an MEMS overload sensitive module, a comparator, a peripheral resistor R13, a peripheral resistor R14 and a peripheral resistor R15, wherein the MEMS overload sensitive module is connected with the negative input end of the comparator, the positive input end of the comparator is connected with a reference voltage, when the overload value of the circuit environment does not reach the preset environment overload value, the output voltage analog quantity is smaller than the reference voltage, and the comparator outputs a high-level signal to the high-voltage conversion isolation feedback circuit; when the overload value of the circuit environment is greater than or equal to the preset overload value of the environment, the analog quantity of the output voltage is greater than or equal to the reference voltage, and the comparator outputs a low-level signal to the high-voltage conversion isolation feedback circuit, wherein the peripheral resistor R13 and the peripheral resistor R14 are used for adjusting the overload value of the preset environment and the peripheral resistor R15 is used for ensuring that the comparator outputs a stable high-level signal.
The dynamic switch isolation circuit comprises a light MOS relay D2, a peripheral resistor R5, a peripheral resistor R6, a peripheral resistor R7 and a peripheral resistor R8, wherein the input end of the light MOS relay D2 is connected with the output end of the controller circuit, the on-off of the input end of the light MOS relay D1 is realized by combining the state of the output end of the controller circuit after the current is limited by the peripheral resistor R5 and the peripheral resistor R6, two switches at the output end of the light MOS relay D1 output the control signal of the other stage of MOS transistor switch of the high-voltage conversion isolation feedback circuit after the voltage division is carried out by the peripheral resistor R7 and the peripheral resistor R8, the switch combination is disconnected when receiving a low level signal output by the controller circuit and outputs the low level signal to an N-channel MOS tube of the high-voltage transformation isolation feedback circuit, the switch combination is closed when receiving a high level signal output by the controller circuit, and outputs the high level signal to an N-channel MOS tube of the high voltage conversion isolation feedback circuit.
The high-voltage conversion isolation feedback circuit comprises a P-channel MOS tube, an N-channel MOS tube, a flyback transformer, a peripheral resistor R9, a peripheral resistor R10, a peripheral resistor R11, a peripheral resistor R12, a peripheral resistor R13, a peripheral resistor R14, a charging capacitor C1, a diode V1 and an isolation operational amplifier, wherein the upper end of the primary side of the flyback transformer is connected with the output end of the P-channel MOS tube, the lower end of the primary side of the flyback transformer is connected with the output end of the N-channel MOS tube, the peripheral resistor R9 and the peripheral resistor R11 are used for ensuring the stable state of the MOS tube before conduction, the peripheral resistor R10 and the peripheral resistor R12 are used for isolating interference signals, the secondary output end of the flyback transformer is connected with a charging circuit consisting of the charging capacitor C1, the diode V1, the peripheral resistor R13 and the peripheral resistor R14, the output end of the charging circuit is connected with the isolation operational amplifier, and the output end of the isolation operational amplifier is connected with the input end of an AD conversion circuit.
The reference voltage in the overload detection circuit is 2.5V.
Compared with the prior art, the invention has the advantages that:
the isolated high-low voltage conversion self-holding circuit provided by the invention realizes the state self-holding and power network isolation of the high-low voltage conversion circuit through the controller circuit, the AD conversion circuit, the overload detection circuit, the isolation self-holding circuit, the dynamic switch isolation circuit, the high-voltage conversion isolation feedback circuit and the 1553B communication interface circuit, has the function of communicating with an external system, can feed back the current state of the circuit in real time through the communication interface, and solves the problems that the traditional high-low voltage conversion circuit structure and control means are relatively simple and have no state feedback.
Drawings
FIG. 1 is a schematic diagram of a high-low voltage conversion self-holding circuit structure provided by the present invention;
FIG. 2 is a schematic diagram of an isolated self-protection circuit structure provided by the present invention;
FIG. 3 is a schematic diagram of a dynamic switch isolation circuit according to the present invention;
FIG. 4 is a schematic diagram of a high voltage conversion isolation feedback circuit according to the present invention;
FIG. 5 is a schematic diagram of an overload detection circuit according to the present invention;
FIG. 6 is a schematic diagram of a 1553B communication interface circuit according to the present invention;
Detailed Description
An isolated high-low voltage conversion self-holding circuit takes a controller circuit as a core, and environmental overload information and the state of a high-voltage conversion circuit can be collected in real time through an AD conversion circuit. Meanwhile, the state of the circuit can be fed back to an external receiving system in real time through a 1553B interface circuit, the control of a first-stage MOS tube switch of the high-voltage transformation isolation feedback circuit is realized through an overload detection circuit and an isolation self-protection circuit, a control signal is sent out through a controller, and a dynamic switch isolation circuit is controlled to realize the control of another stage MOS tube switch of the high-voltage transformation isolation feedback circuit, and the control system mainly comprises the following components: overload detection circuit, keep apart self preservation circuit, high pressure transform isolation feedback circuit, AD converting circuit, dynamic switch isolating circuit, controller circuit, 1553B communication interface circuit, wherein:
overload detection circuit: detect circuit environment overload value, contrast with preset environment overload value according to this overload value, if circuit environment overload value more than or equal to preset environment overload value, then to keeping apart self preservation circuit output low level signal, if circuit environment overload value is less than preset environment overload value, then to keeping apart self preservation circuit output high level signal to return circuit environment overload information to AD converting circuit, wherein:
the overload detection circuit comprises an MEMS overload sensitive module, a comparator, a peripheral resistor R13, a peripheral resistor R14 and a peripheral resistor R15, wherein the MEMS overload sensitive module is connected with the negative input end of the comparator, the positive input end of the comparator is connected with a reference voltage, when the circuit environmental overload value does not reach the preset environmental overload value, the output voltage analog quantity is less than the reference voltage, and the comparator outputs a high-level signal to the high-voltage transformation isolation feedback circuit; when the overload value of the circuit environment is greater than or equal to the preset overload value of the environment, the analog quantity of the output voltage is greater than or equal to the reference voltage, and the comparator outputs a low-level signal to the high-voltage conversion isolation feedback circuit, wherein the peripheral resistor R13 and the peripheral resistor R14 are used for adjusting the overload value of the preset environment and the peripheral resistor R15 is used for ensuring that the comparator outputs a stable high-level signal. (ii) a
Isolation self-protection circuit: controlling the conduction condition of a P-channel MOS tube of the high-voltage transformation isolation feedback circuit according to a level signal sent by the overload detection circuit, and if the overload detection circuit outputs a high level signal, outputting the high level signal to the high-voltage transformation isolation feedback circuit, wherein the P-channel MOS tube is in a cut-off state; if overload detection circuit output low level signal, then to high pressure transform isolation feedback circuit output low level signal, P channel MOS pipe is in the conducting state, wherein:
the isolation self-protection circuit comprises an optical MOS relay D1, a peripheral resistor R1, a peripheral resistor R2, a peripheral resistor R3 and a peripheral resistor R4, wherein the input end of the optical MOS relay D1 is connected with the output end of the overload detection circuit, the connection or disconnection of the input end of the optical MOS relay D1 is realized by combining the state of the output end of the overload detection circuit after the current is limited by the peripheral resistor R1 and the peripheral resistor R2, two switches at the output end of the optical MOS relay D1 are divided by the peripheral resistor R3 and the peripheral resistor R4, and the switches are closed when receiving a low-level signal output by the overload detection circuit, output a low-level signal to a P-channel MOS tube of the high-voltage conversion isolation feedback circuit and output circuit environment overload information to the AD conversion circuit;
1553B communication interface circuit: receiving the state data of each part of the circuit fed back by the controller circuit and the return data of the AD conversion circuit, returning the data to an external receiver, receiving a control signal sent by the external receiver, and forwarding the control signal to the controller circuit;
a controller circuit: if the control signal is received, a high level signal is sent to the dynamic switch isolation circuit; when the control signal is not received, a low level signal is sent to the dynamic switch isolation circuit;
dynamic switch isolation circuit: controlling the conduction condition of an N-channel MOS tube of the high-voltage transformation isolation feedback circuit according to a level signal sent by the controller circuit, and if the controller circuit outputs a low level signal, outputting the low level signal to the high-voltage transformation isolation feedback circuit, wherein the N-channel MOS tube is in a cut-off state; if the controller circuit outputs a high level signal, the high level signal is output to the high-voltage transformation isolation feedback circuit, the N-channel MOS tube is in a conduction state, and when the controller circuit outputs a signal to switch the high level signal and the low level signal, the N-channel MOS tube is continuously switched between a cut-off state and a conduction state, wherein:
the dynamic switch isolation circuit comprises an optical MOS relay D2, a peripheral resistor R5, a peripheral resistor R6, a peripheral resistor R7 and a peripheral resistor R8, wherein the input end of the optical MOS relay D2 is connected with the output end of the controller circuit, the input end of the optical MOS relay D2 is connected with the output end of the controller circuit after current limiting is carried out through the peripheral resistor R5 and the peripheral resistor R6, the connection or disconnection of the input end of the optical MOS relay D2 is realized by combining the state of the output end of the controller circuit, two switches at the output end of the optical MOS relay D2 are divided by the peripheral resistor R7 and the peripheral resistor R8, the switches are combined to be closed when low-level signals output by the controller circuit are received, and low-level signals are output to a P-channel MOS tube of the high-voltage conversion isolation feedback circuit;
high-voltage transformation isolation feedback circuit: receiving level signals output by an isolation self-protection circuit and a dynamic switch isolation circuit, controlling the tubular states of a P-channel MOS tube and an N-channel MOS tube according to the obtained level signals, conducting the P-channel MOS tube when high-voltage conversion is needed, switching the N-channel MOS tube from a cut-off state to a conducting state, converting and charging output voltage in a high-voltage conversion isolation feedback circuit, and simultaneously sending voltage state switching information to an AD conversion circuit, wherein:
the high-voltage conversion isolation feedback circuit comprises a P-channel MOS tube, an N-channel MOS tube, a flyback transformer, a peripheral resistor R10, a peripheral resistor R11, a peripheral resistor R12, a peripheral resistor R13, a peripheral resistor R14, a charging capacitor C1, a diode V1 and an isolation operational amplifier, wherein the upper end of the primary side of the flyback transformer is connected with the output end of the P-channel MOS tube, the lower end of the primary side of the flyback transformer is connected with the output end of the N-channel MOS tube, the peripheral resistor R9 and the peripheral resistor R11 are used for ensuring the stable state of the MOS tube before conduction, the peripheral resistor R10 and the peripheral resistor R12 are used for isolating interference signals, the secondary side output end of the flyback transformer is connected with a charging circuit consisting of the charging capacitor C1, the diode V1, the peripheral resistor R13 and the peripheral resistor R14, the output end of the charging circuit is connected with the isolation operational amplifier, and the output end of the isolation operational amplifier is connected with the input end of the AD conversion circuit;
an AD conversion circuit: and voltage state switching information and circuit environment overload information returned by the overload detection circuit and the high-voltage transformation isolation feedback circuit are respectively collected and sent to an external receiver through a 1553B communication interface circuit.
In the isolated high-low voltage conversion self-holding circuit, after the circuit is electrified, an overload detection circuit controls the on-off of a primary MOS tube switch of a high-voltage conversion isolation feedback circuit according to whether a detected environmental overload value reaches a set threshold value; the controller determines the on-off of the other stage of MOS tube switch according to the received command of the external system 1553B and the state of the high-voltage transformation isolation feedback circuit;
the high-voltage conversion function safety work is realized through the overload detection hardware circuit and the controller, no matter the overload detection hardware circuit, the controller hardware circuit or any single fault of the controller, the abnormal work of the high-voltage conversion function can not be caused, wherein the main functions of all parts of the circuit are as follows:
the isolated self-protection circuit is shown in fig. 2. The light MOS relay D1 is matched with four resistors R1-R4 on the periphery, the signal of an overload detection circuit is received, a control signal of a first-stage P-channel MOS tube switch of a high-voltage conversion isolation feedback circuit is output, the output signal of the overload detection circuit in an initial state after electrification is at a high level, the switch at the output end of the light MOS relay D1 is disconnected, the circuit outputs a high-level signal to the P-channel MOS tube of the high-voltage conversion isolation feedback circuit, and the P-channel MOS tube is in a cut-off state; when the output signal of the overload detection circuit is changed into low level, two switches at the output end of the optical MOS relay D1 are closed, the circuit outputs low level signals to a P-channel MOS tube of the high-voltage transformation isolation feedback circuit, and the P-channel MOS tube is conducted. Meanwhile, a switch of a second channel at the output end of the optical MOS relay is closed, and low level is fed back to the input end of the optical MOS relay, so that the self-holding of the circuit state is realized, and in addition, the isolation of input signals and output signals is realized by the optical MOS relay.
As shown in fig. 3, the dynamic switch isolation circuit receives a signal of the controller circuit and outputs a control signal of a first-stage N-channel MOS transistor switch of the high-voltage conversion isolation feedback circuit by using a photo-MOS relay D2 in cooperation with four resistors R5 to R8 on the periphery, the output signal of the powered-on initial state controller circuit is at a low level, the switch at the output end of the photo-MOS relay D2 is turned off, the circuit outputs a low-level signal to the N-channel MOS transistor of the high-voltage conversion isolation feedback circuit, and the N-channel MOS transistor is in a cut-off state; when the output signal of the controller circuit is changed into high level, two switches at the output end of the optical MOS relay D2 are closed, the circuit outputs high level signal to the N-channel MOS tube of the high-voltage transformation isolation feedback circuit, the N-channel MOS tube is conducted, meanwhile, the optical MOS relay realizes the isolation of input signal and output signal, the output signal of the controller circuit is switched back and forth between low level and high level, and the on-off switching of the N-channel MOS tube in the high-voltage transformation isolation feedback circuit is realized.
As shown in fig. 4, the high-voltage conversion isolation feedback circuit realizes the function of converting direct-current low voltage into direct-current high voltage by a P-channel MOS transistor, an N-channel MOS transistor, a flyback transformer, a peripheral resistor, a capacitor, a diode and an isolation operational amplifier, and can feed back the state of the secondary high voltage of the transformer in real time by the isolation operational amplifier;
and in the initial state after electrification, the two MOS tubes are in a cut-off state, and the secondary side of the transformer has no voltage. When the isolation self-protection circuit outputs a low level signal and the dynamic switch isolation circuit outputs a signal for continuously switching high and low levels, the P-channel MOS tube is always in a conducting state, and the N-channel MOS tube is in a state of switching on and off back and forth;
the conversion from the primary side direct current low voltage of the isolation transformer to the secondary side direct current high voltage of the isolation transformer is realized by using the reverse electromotive force induced by the primary side inductor of the isolation transformer and the turn ratio of the primary side and the secondary side of the isolation transformer at the moment of disconnection of the N-channel MOS tube;
when the N-channel MOS tube is conducted, the primary side bearing voltage of the isolation transformer is positive, negative and negative, and the secondary side voltage of the isolation transformer is positive, negative and positive. Because the secondary side circuit of the isolation transformer is connected with the diode in series, the secondary side output voltage of the isolation transformer is added at two ends of the diode, and the capacitor at the secondary side output end of the isolation transformer cannot be charged;
when the N-channel MOS tube is disconnected, the primary side of the isolation transformer generates reverse electromotive force, the voltage borne by the primary side of the isolation transformer is up-negative and down-positive, and the voltage induced by the secondary side of the isolation transformer is up-positive and down-negative. At the moment, the diode connected in series on the secondary side of the isolation voltage device is normally conducted, the output voltage of the secondary side of the isolation voltage transformer can charge the capacitor at the output end, and the conversion from the primary side direct current low voltage of the transformer to the secondary side direct current high voltage of the transformer is finally realized through the continuous repetition of the switching process.
As shown in fig. 5, the overload detection circuit can detect a set overload value by using an MEMS overload sensitive module, a reference voltage chip, and a comparator, in combination with three resistors on the periphery, and in an initial state after power-on, the output analog quantity of the MEMS overload sensitive module is close to 0V, and the output analog quantity of the reference voltage is 2.5V. At this time, the level of the positive input end of the comparator is higher than that of the negative input end, and the output end of the comparator is high level. When the environmental overload reaches a certain threshold, the analog quantity output by the MEMS overload sensitive module is divided by the resistor R13 and the resistor R14, and the level of the analog quantity output by the MEMS overload sensitive module exceeds the level of the analog quantity output by the reference voltage by 2.5V. At this time, the level of the positive input end of the comparator is lower than that of the negative input end, and the output end of the comparator is low level. Through the process, the overload detection circuit can detect environmental overload information with a certain threshold value and output a low-level signal to the isolation self-protection circuit.
As shown in fig. 6, the 1553B communication interface circuit realizes the 1553B communication function of the circuit through a 1553B communication IP core, a receiver, a transmitter and an isolation transformer inside the controller. Through the 1553B communication interface, the circuit can feed back the self state in real time, including an environmental overload value, a high-voltage conversion state and the like. The design scheme fully utilizes the resources in the controller, realizes a 1553B communication protocol IP core through software, and completely meets various requirements of 1553B communication by matching with a peripheral transceiver and an isolation transformer circuit. Compared with the traditional 1553B communication special protocol chip scheme, the scheme has obvious advantages of volume and cost.
The following is further illustrated with reference to specific examples:
after the circuit is electrified and starts to work, the overload detection circuit detects that the overload value of the circuit environment is 3g at the moment, the preset overload value of the environment is 2g, and at the moment, the overload value of the circuit environment is greater than the preset overload value of the environment, a low level signal is output to the isolation self-protection circuit, the isolation self-protection circuit receives the low level signal and outputs a low level signal to the high-voltage transformation isolation feedback circuit, and the P-channel MOS tube is in a conducting state;
meanwhile, the controller circuit receives the control signal and sends a high level signal to the dynamic switch isolation circuit, the dynamic switch isolation circuit outputs the high level signal to the high voltage conversion isolation feedback circuit to conduct the N-channel MOS tube, the controller circuit continuously switches the high level and the low level according to the requirement and enables the conduction state of the N-channel MOS tube to be continuously switched, and the primary side direct current low voltage of the isolation transformer in the high voltage conversion isolation feedback circuit is converted to the secondary side direct current high voltage of the isolation transformer.
Those skilled in the art will appreciate that the invention may be practiced without these specific details.
Claims (6)
1. An isolated high-low voltage conversion self-holding circuit is characterized in that: including overload detection circuit, keep apart self preservation circuit, high pressure transform isolation feedback circuit, AD converting circuit, dynamic switch isolating circuit, controller circuit, 1553B communication interface circuit, wherein:
overload detection circuit: detecting an environmental overload value, comparing the overload value with a preset environmental overload value, if the circuit environmental overload value is greater than or equal to the preset environmental overload value, outputting a low level signal to the isolation self-protection circuit, and if the circuit environmental overload value is less than the preset environmental overload value, outputting a high level signal to the isolation self-protection circuit and sending environmental overload information to the AD conversion circuit;
isolation self-protection circuit: controlling the conduction condition of a P-channel MOS tube of the high-voltage transformation isolation feedback circuit according to a level signal sent by the overload detection circuit, and if the overload detection circuit outputs a high level signal, outputting the high level signal to the high-voltage transformation isolation feedback circuit, wherein the P-channel MOS tube is in a cut-off state; if the overload detection circuit outputs a low level signal, the overload detection circuit outputs a low level signal to the high-voltage transformation isolation feedback circuit, and the P-channel MOS tube is in a conducting state;
1553B communication interface circuit: receiving state data of each part of circuit fed back by the controller circuit, sending the state data to an external system, receiving a control signal sent by the external system, and forwarding the control signal to the controller circuit;
a controller circuit: receiving a control signal and sending a high level or low level signal to the dynamic switch isolation circuit; the result of the AD conversion circuit is read, and the environmental overload value and the state of the high-voltage conversion isolation feedback circuit are judged in real time; when the high voltage of the high voltage transformation isolation feedback circuit reaches a certain value, the dynamic switch isolation circuit always sends a low level signal, and the conversion process of the low voltage to the high voltage is stopped; when the high voltage of the high-voltage transformation isolation feedback circuit is judged to be lower than a certain value, a signal for switching high and low levels is sent to the dynamic switch isolation circuit, and the conversion process of low voltage to high voltage is started until the high voltage reaches a preset value;
dynamic switch isolation circuit: controlling the conduction condition of an N-channel MOS tube of the high-voltage transformation isolation feedback circuit according to a level signal sent by the controller circuit, and if the controller circuit outputs a low level signal, outputting the low level signal to the high-voltage transformation isolation feedback circuit, wherein the N-channel MOS tube is in a cut-off state; if the controller circuit outputs a high level signal, the high level signal is output to the high-voltage conversion isolation feedback circuit, the N-channel MOS tube is in a conducting state, and when the controller circuit outputs a signal to switch the high level signal and the low level signal, the N-channel MOS tube is in a stopping state and the conducting state and is continuously switched;
high-voltage transformation isolation feedback circuit: receiving level signals output by an isolation self-protection circuit and a dynamic switch isolation circuit, controlling the tubular states of a P-channel MOS tube and an N-channel MOS tube according to the obtained level signals, conducting the P-channel MOS tube when high-voltage conversion is needed, switching the N-channel MOS tube between a cut-off state and a conducting state, converting and charging output voltage in a high-voltage conversion isolation feedback circuit, and sending voltage state information to an AD conversion circuit;
an AD conversion circuit: the environment overload information of the overload detection circuit and the voltage state information of the high-voltage transformation isolation feedback circuit are collected respectively and are sent to an external system through a 1553B communication interface circuit.
2. The isolated high-low voltage conversion self-holding circuit of claim 1, wherein: the isolation self-protection circuit comprises an optical MOS relay D1, a peripheral resistor R1, a peripheral resistor R2, a peripheral resistor R3 and a peripheral resistor R4, wherein the input end of the optical MOS relay D1 is connected with the output end of the overload detection circuit, the connection or disconnection of the input end of the optical MOS relay D1 is realized by combining the state of the output end of the overload detection circuit after the current is limited through the peripheral resistor R1 and the peripheral resistor R2, two switches at the output end of the optical MOS relay D1 output a control signal of a first-stage MOS tube switch of the high-voltage transformation isolation feedback circuit after voltage division is carried out through the peripheral resistor R3 and the peripheral resistor R4, the two switches are closed when receiving a low-level signal output by the overload detection circuit and output the low-level signal to a P-channel MOS tube of the high-voltage transformation isolation feedback circuit, and simultaneously feed the low-level signal back to the input end of the optical MOS relay D1, and the state self-protection of the isolation circuit is realized.
3. The isolated high-low voltage conversion self-holding circuit of claim 1, wherein: the overload detection circuit comprises an MEMS overload sensitive module, a comparator, a peripheral resistor R13, a peripheral resistor R14 and a peripheral resistor R15, wherein the MEMS overload sensitive module is connected with the negative input end of the comparator, the positive input end of the comparator is connected with a reference voltage, when the overload value of the circuit environment does not reach the preset environment overload value, the output voltage analog quantity is smaller than the reference voltage, and the comparator outputs a high-level signal to the high-voltage conversion isolation feedback circuit; when the overload value of the circuit environment is greater than or equal to the preset overload value of the environment, the analog quantity of the output voltage is greater than or equal to the reference voltage, and the comparator outputs a low-level signal to the high-voltage conversion isolation feedback circuit, wherein the peripheral resistor R13 and the peripheral resistor R14 are used for adjusting the overload value of the preset environment and the peripheral resistor R15 is used for ensuring that the comparator outputs a stable high-level signal.
4. The isolated high-low voltage conversion self-holding circuit of claim 1, wherein: the dynamic switch isolation circuit comprises a light MOS relay D2, a peripheral resistor R5, a peripheral resistor R6, a peripheral resistor R7 and a peripheral resistor R8, wherein the input end of the light MOS relay D2 is connected with the output end of the controller circuit, the on-off of the input end of the light MOS relay D1 is realized by combining the state of the output end of the controller circuit after the current is limited by the peripheral resistor R5 and the peripheral resistor R6, two switches at the output end of the light MOS relay D1 output the control signal of the other stage of MOS transistor switch of the high-voltage conversion isolation feedback circuit after the voltage division is carried out by the peripheral resistor R7 and the peripheral resistor R8, the two switches are disconnected when receiving the low level signal output by the controller circuit and output the low level signal to the N-channel MOS tube of the high voltage transformation isolation feedback circuit, the two switches are closed when receiving the high level signal output by the controller circuit, and output the high level signal to the N-channel MOS tube of the high voltage transformation isolation feedback circuit.
5. The isolated high-low voltage conversion self-holding circuit of claim 1, wherein: the high-voltage conversion isolation feedback circuit comprises a P-channel MOS tube, an N-channel MOS tube, a flyback transformer, a peripheral resistor R9, a peripheral resistor R10, a peripheral resistor R11, a peripheral resistor R12, a peripheral resistor R13, a peripheral resistor R14, a charging capacitor C1, a diode V1 and an isolation operational amplifier, wherein the upper end of the primary side of the flyback transformer is connected with the output end of the P-channel MOS tube, the lower end of the primary side of the flyback transformer is connected with the output end of the N-channel MOS tube, the peripheral resistor R9 and the peripheral resistor R11 are used for ensuring the stable state of the MOS tube before conduction, the peripheral resistor R10 and the peripheral resistor R12 are used for isolating interference signals, the secondary output end of the flyback transformer is connected with a charging circuit consisting of the charging capacitor C1, the diode V1, the peripheral resistor R13 and the peripheral resistor R14, the output end of the charging circuit is connected with the isolation operational amplifier, and the output end of the isolation operational amplifier is connected with the input end of an AD conversion circuit.
6. The isolated high-low voltage conversion self-holding circuit of claim 3, wherein: the reference voltage in the overload detection circuit is 2.5V.
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