CN112230700A - Output voltage control device - Google Patents
Output voltage control device Download PDFInfo
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- CN112230700A CN112230700A CN202011049570.1A CN202011049570A CN112230700A CN 112230700 A CN112230700 A CN 112230700A CN 202011049570 A CN202011049570 A CN 202011049570A CN 112230700 A CN112230700 A CN 112230700A
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- output voltage
- circuit
- sampling
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- protection circuit
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Dc-Dc Converters (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
An output voltage control device comprises a sampling circuit and a control protection circuit. The sampling circuit is composed of a plurality of series resistor voltage division networks with the same structure and the same resistance value, and the channels are mutually independent. The control protection circuit comprises a software overvoltage protection circuit, a loop clamping protection circuit, a hardware overvoltage protection circuit and an output voltage closed-loop control circuit, and the purpose that the response condition enters a corresponding control protection mode is achieved. The invention realizes the multiplexing of the sampling channel, the diversity of the protection modes and the hierarchy of the protection levels, solves the problems of the uniqueness of the sampling channel, the singleness of the protection modes and the singleness of the protection levels in the prior art, avoids the problem that the control protection of the system is failed even because the module is invalid due to the fault of the sampling circuit, and has the advantages of simple circuit, flexible control and reliable operation.
Description
Technical Field
The invention relates to the technical field of power supply circuits, in particular to an output voltage control device.
Background
With the development of power electronic technology, a charger and a rectifying module are also rapidly developed, no matter the direct current charging of an electric automobile or the charging or the power supply of a storage battery pack of a traditional power supply, in addition, for all direct current output voltage-stabilized power supplies, firstly, the direct current output voltage can meet the voltage range of load requirements, then, the voltage range exceeds the output voltage range, the rapid protection can be realized, and finally, the normal operation of a system is not influenced by a module with a fault.
The existing module output voltage is sampled in a single-channel series resistor voltage division mode, and then enters closed-loop control and overvoltage protection respectively, so that the module output voltage completely depends on the reliability of a single sampling channel, and once the sampling channel fails, the closed-loop control and the overvoltage protection lose all functions. Meanwhile, some modules only have hardware hysteresis comparison protection circuits, and the protection mode is single and has no software protection.
Disclosure of Invention
The invention aims to provide an output voltage control device aiming at the defects of the prior art, and solves the problems of uniqueness of the existing sampling channel, unicity of a protection mode and independence of protection levels.
The invention is realized by adopting the following technical scheme:
the invention provides an output voltage control device, which comprises a sampling circuit and a control protection circuit, wherein the sampling circuit is connected with the control protection circuit;
the sampling circuit comprises a plurality of independent sampling circuits with the same structure;
and each sampling circuit is correspondingly connected with a corresponding control protection circuit.
Furthermore, each sampling circuit is a series resistance voltage division circuit and is connected to the output voltage of the device to be sampled.
Furthermore, the control protection circuit comprises a software overvoltage protection circuit, a loop clamping protection circuit, a hardware overvoltage protection circuit and/or an output voltage closed-loop control circuit, which are respectively connected to the sampling channels of the corresponding sampling circuits.
Further, the software overvoltage protection circuit is connected to a sampling channel of the first sampling circuit;
the software overvoltage protection circuit comprises a filtering conditioning circuit and a microprocessor MCU, when a sampling signal of the output voltage of the device to be sampled is greater than a threshold Vth1, the software overvoltage protection is triggered, the microprocessor MCU sends a locking closing driving signal, and the driving of a main loop power tube of the device to be sampled is closed.
Further, the loop clamp protection circuit is connected to a sampling channel of the first sampling circuit;
the loop clamping protection circuit comprises a PI regulator and a PWM controller; and after the output voltage of the device to be sampled is superposed with the given voltage Vref2, the superposed voltage is input into a PI regulator, when the sampling signal of the output voltage of the device to be sampled reaches a threshold value 2, the PI regulator acts, the obtained output control signal is compared with a triangular wave of a PWM controller to form a driving signal, and the output voltage is clamped to a threshold value Vth 2.
Further, the hardware overvoltage protection circuit is connected to a sampling channel of the second sampling circuit;
the hardware overvoltage protection circuit comprises a filter comparison circuit; when the sampling signal of the output voltage of the device to be sampled reaches a threshold value Vth3, the filter comparison circuit compares the output to trigger hardware overvoltage protection, enters a protection pin of the PWM controller, and closes the drive of a main loop power tube of the device to be sampled.
Further, the output voltage closed-loop control circuit is connected to a sampling channel of a third sampling circuit;
the output voltage closed-loop control circuit comprises a PI regulator and a PWM controller; when the closed-loop control circuit works normally, after the output voltage of the device to be sampled and the given voltage Vref1 pass through the PI regulator, the obtained output control signal is compared with the triangular wave of the PWM controller to form a driving signal, so that the stable output voltage is equal to the actual output voltage.
Further, the given voltage Vref2 is adjustable, including manual adjustment and automatic system adjustment.
Further, the threshold Vth1 < Vth2 < Vth3 are both greater than the maximum value of the stable output voltage.
Furthermore, the protection time of the software overvoltage protection circuit is in the second level; the protection time of the loop clamping protection circuit is millisecond level; the protection time of the hardware overvoltage protection circuit is microsecond level.
In summary, the present invention provides an output voltage control apparatus, which includes a sampling circuit and a control protection circuit. The sampling circuit is composed of a plurality of series resistor voltage division networks with the same structure and the same resistance value, and the channels are mutually independent. The control protection circuit comprises a software overvoltage protection circuit, a loop clamping protection circuit, a hardware overvoltage protection circuit and an output voltage closed-loop control circuit, and the purpose that the response condition enters a corresponding control protection mode is achieved. The invention realizes the multiplexing of the sampling channel, the diversity of the protection modes and the hierarchy of the protection levels, solves the problems of the uniqueness of the sampling channel, the singleness of the protection modes and the singleness of the protection levels in the prior art, avoids the problem that the control protection of the system is failed even because the module is invalid due to the fault of the sampling circuit, and has the advantages of simple circuit, flexible control and reliable operation.
Drawings
FIG. 1 is a schematic circuit diagram of an output voltage control apparatus in the prior art;
fig. 2 is a schematic circuit diagram of an output voltage control apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The traditional output voltage control and protection method is shown in a schematic block diagram in fig. 1, firstly, the output voltage is sampled in a single-channel series resistor voltage division mode, the network is labeled as VF, then the sampled voltage respectively enters a closed-loop control VF1 and an overvoltage protection VF2, meanwhile, the VF1 is proportionally adjusted according to the sampling maximum value requirement of a microprocessor MCU, and then VF3 enters an AD pin, so that the module output voltage completely depends on the reliability of a single sampling channel. In case of failure of the sampling channel, the closed-loop control and overvoltage protection will be totally disabled. Therefore, only with single-channel sampling, the probability of failure of components to cause module closed-loop control and overvoltage protection is increased. And then, the hardware hysteresis comparison circuit outputs overvoltage closing control chip drive, the protection after software sampling depends on the integrity of a sampling channel and an output signal of hardware protection, and the two determine whether the output voltage is overvoltage or not together, so that a locking closing drive signal is sent out, the drive of a main loop power tube is closed, and the software overvoltage protection of the output voltage is realized. Therefore, only the hardware protection mode is adopted, and the protection mode is single. Finally, when the overvoltage protection circuit fails, no second-level overvoltage protection threshold is used for protection, and damage to the system caused by module overvoltage cannot be avoided. Therefore, the protection level is single, and the hierarchy and the timeliness are lost.
In summary, the present invention provides an output voltage control apparatus, which includes a sampling circuit and a control protection circuit. The sampling circuit is composed of a plurality of series resistor voltage division networks with the same structure and the same resistance value, and the channels are mutually independent. The control protection circuit comprises a software overvoltage protection circuit, a loop clamping protection circuit, a hardware overvoltage protection circuit and an output voltage closed-loop control circuit, and the purpose that the response condition enters a corresponding control protection mode is achieved. The invention realizes the multiplexing of the sampling channel, the diversity of the protection modes and the hierarchy of the protection levels, solves the problems of the uniqueness of the sampling channel, the singleness of the protection modes and the singleness of the protection levels in the prior art, avoids the problem that the control protection of the system is failed even because the module is invalid due to the fault of the sampling circuit, and has the advantages of simple circuit, flexible control and reliable operation.
The invention provides an output voltage control device, as shown in fig. 2, which is a schematic block diagram of the output voltage control device and comprises a sampling circuit and a control protection circuit. The sampling circuit comprises a plurality of independent sampling circuits with the same structure; and each sampling circuit is correspondingly connected with a corresponding control protection circuit. Wherein, as shown in fig. 2: the sampling circuit is composed of a series resistor voltage division network with three paths of same structures and same resistance values (any number of sampling circuits with multi-path structures can be arranged according to needs, three paths are only illustrated and are not limited by the invention), and the series resistor voltage division network is connected to the output voltage VOUT of the device to be sampled. The control protection circuit is respectively connected to the sampling channels of the corresponding sampling circuits through a software overvoltage protection circuit, a loop clamping protection circuit, a hardware overvoltage protection circuit and/or an output voltage closed-loop control circuit. The device realizes the multiplexing of the sampling channel, the diversity of the protection modes and the hierarchy of the protection levels, and solves the problems of the uniqueness of the existing sampling channel, the unicity of the protection modes and the independence of the protection levels.
(1) Output voltage sampling channel
The output voltage sampling has three independent channels, the schematic diagram of the output voltage sampling point and the network label in the PCB are the same as VOUT, but the PCB wiring adopts three different position points to respectively route to ensure the independence of the channels, and the network labels after sampling the series resistance voltage division are respectively VF1, VF2 and VF3, as shown by reference numeral 104 in fig. 2.
(2) Output overvoltage protection circuit
The output voltage processing loops are 101, 102 and 103, respectively. The 101 output voltage processing circuit is an output voltage closed-loop control circuit, consists of a channel VF1 and an output voltage closed-loop circuit and is used for realizing the stability of output voltage; the 102 output voltage processing loop consists of a channel VF2, a software overvoltage protection circuit and a loop clamping circuit and is used for realizing the functions of output software overvoltage protection and output voltage clamping protection; 103, the output voltage processing circuit is a hardware overvoltage protection circuit, and is composed of a channel VF3 and a hardware overvoltage protection circuit, so that the hardware overvoltage protection of the output voltage is realized. The probability of a failure of one processing loop resulting in loss of the overall protection function is very low.
Further, the software overvoltage protection circuit is connected to a sampling channel of the first sampling circuit; the software overvoltage protection circuit comprises a filtering conditioning circuit and a microprocessor MCU, when a sampling signal of the output voltage of the device to be sampled is greater than a threshold Vth1, the software overvoltage protection is triggered, the microprocessor MCU sends a locking closing driving signal, and the driving of a main loop power tube of the device to be sampled is closed. Specifically, as shown in fig. 2, a VF2 channel is adopted for software overvoltage protection sampling, the sampling enters the microprocessor MCU through the filtering conditioning circuit, the software overvoltage protection is triggered when the output voltage sampling signal is greater than the threshold Vth1, and the microprocessor MCU sends a locking closing driving signal to close the driving of the main loop power tube, thereby implementing the software overvoltage protection of the output voltage. The time to fully lock the machine requires on the order of seconds.
Furthermore, the loop clamping protection circuit is connected to a sampling channel of the first sampling circuit; the loop clamping protection circuit comprises a PI regulator and a PWM controller; and after the output voltage of the device to be sampled is superposed with the given voltage Vref2, the superposed voltage is input into a PI regulator, when the sampling signal of the output voltage of the device to be sampled reaches a threshold value 2, the PI regulator acts, the obtained output control signal is compared with a triangular wave of a PWM controller to form a driving signal, and the output voltage is clamped to a threshold value Vth 2. Specifically, as shown in fig. 2, a VF2 channel is adopted for sampling by the loop clamp protection circuit, a given voltage is a fixed value Vref2, when an output voltage sampling signal reaches a threshold 2, the PI regulation controller functions, the output of the voltage fast loop is compared with a triangular wave of the PWM controller to form a driving signal, and the output voltage is clamped to a threshold Vth2, so that clamp protection of the output voltage is realized. The loop triggers to a response time on the order of milliseconds.
Further, the hardware overvoltage protection circuit is connected to a sampling channel of the second sampling circuit; the hardware overvoltage protection circuit comprises a filter comparison circuit; when the sampling signal of the output voltage of the device to be sampled reaches a threshold value Vth3, the filter comparison circuit compares the output to trigger hardware overvoltage protection, enters a protection pin of the PWM controller, and closes the drive of a main loop power tube of the device to be sampled. Specifically, as shown in fig. 2, a VF3 channel is adopted for sampling of the hardware overvoltage protection circuit, and when an output voltage sampling signal reaches a threshold Vth3, the filtering operational amplifier hysteresis loop compares and outputs a trigger hardware overvoltage protection signal, and the trigger hardware overvoltage protection signal enters a protection pin of the PWM controller, so that the drive of the main loop power tube is closed, and the hardware overvoltage protection of the output voltage is realized. The action time is of the order of microseconds.
Further, the output voltage closed-loop control circuit is connected to a sampling channel of the third sampling circuit; the output voltage closed-loop control circuit comprises a PI regulator and a PWM controller; when the closed-loop control circuit works normally, after the output voltage of the device to be sampled and the given voltage Vref1 pass through the PI regulator, the obtained output control signal is compared with the triangular wave of the PWM controller to form a driving signal, so that the stable output voltage is equal to the actual output voltage, and the actual output voltage is the actual output voltage which is proportional to the given voltage Vref 1. Specifically, as shown in fig. 2, a VF1 channel is used for sampling the output voltage, and when the control loop is normal, the output voltage and the given voltage Vref2 pass through a PI controller, and then the obtained output control signal is compared with a triangular wave of a PWM controller to form a driving signal, so that the output voltage is equal to the given actual output voltage, and the output voltage is stable. The given voltage of Vref2 is adjustable, and can be divided into manual adjustment and system automatic adjustment, and can satisfy stable operation in the output voltage range.
Meanwhile, the threshold Vth1 < Vth2 < Vth3 are both larger than the maximum value of the stable output voltage. The invention provides a protection mode diversity optimization strategy, realizes the hardware protection, the software protection and the ring clamping control of the output voltage, and can realize the stable control of the output voltage. The invention provides a multipath optimization strategy of a sampling channel, realizes mutual independence of a control channel and a protection channel, greatly reduces the probability of output overvoltage failure caused by failure of partial components, and ensures normal and reliable operation of the system. A protection level hierarchical optimization strategy is provided, three-gear layer-by-layer protection of output voltage is realized, microsecond-level, millisecond-level and second-level time-sharing aging protection is completed, and the rationality of communication power supply module protection is guaranteed.
In addition, if the output voltage is controlled by digital control, the sampling channel VF1 and the adopted channel VF2 can be combined into the same channel, and the output voltage closed-loop control, the loop clamp protection and the software overvoltage protection are realized by the digital control; the sampling channel VF3 is also used for a hardware overvoltage protection circuit, and the output signal is used as an enable of the isolation driver, and the output of the isolation driver is closed during protection.
The present invention has been given above in relation to specific embodiments, but the invention is not limited to the described embodiments. In the thought given by the present invention, the technical means in the above embodiments are changed, replaced, modified in a manner that is easily imaginable to those skilled in the art, and the functions are basically the same as the corresponding technical means in the present invention, and the purpose of the invention is basically the same, so that the technical scheme formed by fine tuning the above embodiments still falls into the protection scope of the present invention.
Claims (10)
1. The output voltage control device is characterized by comprising a sampling circuit and a control protection circuit;
the sampling circuit comprises a plurality of independent sampling circuits with the same structure;
and each sampling circuit is correspondingly connected with a corresponding control protection circuit.
2. The output voltage control device of claim 1, wherein each of the sampling circuits is a series resistance voltage divider circuit connected to the output voltage of the device to be sampled.
3. The output voltage control device according to claim 1 or 2, wherein the control protection circuit comprises a software overvoltage protection circuit, a loop clamp protection circuit, a hardware overvoltage protection circuit and/or an output voltage closed-loop control circuit, and the software overvoltage protection circuit, the loop clamp protection circuit, the hardware overvoltage protection circuit and/or the output voltage closed-loop control circuit are respectively connected to the sampling channels of the corresponding sampling circuits.
4. The output voltage control device of claim 3, wherein the software over-voltage protection circuit is connected to a sampling channel of the first sampling circuit;
the software overvoltage protection circuit comprises a filtering conditioning circuit and a microprocessor MCU, when a sampling signal of the output voltage of the device to be sampled is greater than a threshold Vth1, the software overvoltage protection is triggered, the microprocessor MCU sends a locking closing driving signal, and the driving of a main loop power tube of the device to be sampled is closed.
5. The output voltage control device of claim 4, wherein the loop clamp protection circuit is connected to a sampling channel of the first sampling circuit;
the loop clamping protection circuit comprises a PI regulator and a PWM controller; and after the output voltage of the device to be sampled is superposed with the given voltage Vref2, the superposed voltage is input into a PI regulator, when the sampling signal of the output voltage of the device to be sampled reaches a threshold value 2, the PI regulator acts, the obtained output control signal is compared with a triangular wave of a PWM controller to form a driving signal, and the output voltage is clamped to a threshold value Vth 2.
6. The output voltage control device of claim 5, wherein the hardware overvoltage protection circuit is connected to a sampling channel of a second sampling circuit;
the hardware overvoltage protection circuit comprises a filter comparison circuit; when the sampling signal of the output voltage of the device to be sampled reaches a threshold value Vth3, the filter comparison circuit compares the output to trigger hardware overvoltage protection, enters a protection pin of the PWM controller, and closes the drive of a main loop power tube of the device to be sampled.
7. The output voltage control device of claim 6, wherein the output voltage closed loop control circuit is connected to a sampling channel of a third sampling circuit;
the output voltage closed-loop control circuit comprises a PI regulator and a PWM controller; when the closed-loop control circuit works normally, after the output voltage of the device to be sampled and the given voltage Vref1 pass through the PI regulator, the obtained output control signal is compared with the triangular wave of the PWM controller to form a driving signal, so that the stable output voltage is equal to the actual output voltage.
8. The output voltage control apparatus according to claim 7, wherein the given voltage Vref2 is adjustable, including manual adjustment and system automatic adjustment.
9. The output voltage control apparatus according to claim 7, wherein the threshold Vth1 < Vth2 < Vth3 are both greater than the maximum value of the stable output voltage.
10. The output voltage control device according to any one of claims 3 to 9, wherein the protection time of the software overvoltage protection circuit is in the order of seconds; the protection time of the loop clamping protection circuit is millisecond level; the protection time of the hardware overvoltage protection circuit is microsecond level.
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| CN202011049570.1A CN112230700A (en) | 2020-09-29 | 2020-09-29 | Output voltage control device |
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| CN202011049570.1A CN112230700A (en) | 2020-09-29 | 2020-09-29 | Output voltage control device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113258532A (en) * | 2021-06-22 | 2021-08-13 | 艾德克斯电子（南京）有限公司 | Overvoltage protection method and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113258532A (en) * | 2021-06-22 | 2021-08-13 | 艾德克斯电子（南京）有限公司 | Overvoltage protection method and device |
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Application publication date: 20210115 |