CN114362499A - Protection circuit and full-control rectification circuit - Google Patents
Protection circuit and full-control rectification circuit Download PDFInfo
- Publication number
- CN114362499A CN114362499A CN202111447402.2A CN202111447402A CN114362499A CN 114362499 A CN114362499 A CN 114362499A CN 202111447402 A CN202111447402 A CN 202111447402A CN 114362499 A CN114362499 A CN 114362499A
- Authority
- CN
- China
- Prior art keywords
- switching device
- circuit
- protection circuit
- capacitor
- mode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 91
- 230000002441 reversible effect Effects 0.000 claims description 9
- 230000000740 bleeding effect Effects 0.000 claims description 8
- 230000002265 prevention Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 abstract description 14
- 230000003139 buffering effect Effects 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000001052 transient effect Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Images
Landscapes
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
The application discloses protection circuit and full control rectifier circuit include: the first end of the resistive device is connected with the positive electrode of the power supply and the first end of the third switching device, and the second end of the resistive device is connected with the first end of the first switching device so as to control the charging and discharging rate of the capacitor. The control unit is connected with the first switch device, the second switch device, the third switch device and the fourth switch device and is used for controlling the on-off of each switch device according to the working mode of the circuit so as to switch the working mode of the protection circuit, so that the protection circuit has the functions of buffering, releasing and preventing voltage reversal in different working modes. Therefore, the protection circuit provided by the application can protect the capacitor in different working stages through a single protection circuit, and a plurality of circuits with different functions are not required to be connected into the circuit, so that the rectification circuit is simplified, and the circuit cost is reduced.
Description
Technical Field
The application relates to the technical field of electronics, in particular to a protection circuit and a fully-controlled rectification circuit.
Background
The fully-controlled rectifying circuit is a circuit capable of converting alternating current electric energy into direct current electric energy, and is widely applied. In order to compensate the reactive power of the inductive load of the fully controlled rectifying circuit, improve the power factor of the fully controlled rectifying circuit, improve the quality of the direct current voltage at the output end of the circuit and reduce the loss of the circuit, the direct current output end of the fully controlled rectifying circuit needs to be connected with a large-capacity capacitor in parallel. In order to protect the capacitor from normal operation, in the moment of switching on and off the circuit, in order to prevent the circuit fault caused by the over-high charging rate and discharging rate of the capacitor, a buffer circuit and a bleeder circuit need to be connected into a fully-controlled rectifier circuit, and a reverse voltage protection circuit needs to be connected to prevent the capacitor from being damaged. However, the structure of the rectifier circuit becomes complicated by connecting too many protection circuits in the circuit, and the circuit cost is increased by wasting electronic devices.
Therefore, how to provide a protection circuit capable of simplifying a rectifier circuit and reducing circuit cost is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The purpose of this application is to provide a protection circuit and a full control rectifier circuit to simplify the rectifier circuit and reduce the cost of protection circuit.
In order to solve the above technical problem, the present application provides a protection circuit, including:
the circuit comprises a resistive device, a first switching device 1, a second switching device 2, a third switching device 3, a fourth switching device 4 and a control unit 5;
the control unit 5 is connected with the first switch device 1, the second switch device 2, the third switch device 3 and the fourth switch device 4, and is used for controlling the on-off of each switch device according to the working mode of the circuit;
the first end of the resistive device is connected with the positive electrode of the power supply and the first end of the third switching device 3, and the second end of the resistive device is connected with the first end of the first switching device 1 to control the discharge rate of the capacitor;
a second end of the first switching device 1 is connected with a first end of the second switching device 2 to serve as a first common end, a second end of the second switching device 2 is connected with the negative electrode of the power supply and a second end of the capacitor, and the first common end is connected with a second end of the fourth switching device 4;
a second terminal of the third switching device 3 is connected to a first terminal of the fourth switching device 4 as a second common terminal, and the second common terminal is connected to a first terminal of the capacitor.
Preferably, the first switching device 1, the second switching device 2, the third switching device 3, and the fourth switching device 4 are MOS transistors having a body diode.
Preferably, the operation modes include:
the device comprises a buffer mode, a normal working mode, a discharge mode and an anti-reverse connection protection mode.
Preferably, if the operating mode is the buffering mode, the controlling the on/off of each switching device according to the operating mode of the circuit specifically includes:
and controlling the first switching device 1 to be switched on, and switching off the second switching device 2, the third switching device 3 and the fourth switching device 4.
Preferably, if the operating mode is the normal operating mode, the controlling the on/off of each switching device according to the operating mode of the circuit specifically includes:
and controlling the third switching device 3 to be turned on, and turning off the first switching device 1, the second switching device 2 and the fourth switching device 4.
Preferably, if the operating mode is the bleeding mode, the controlling the on/off of each switching device according to the operating mode of the circuit specifically includes:
and controlling the first switching device 1 and the second switching device 2 to be turned on, and controlling the third switching device 3 and the fourth switching device 4 to be turned off.
Preferably, if the operating mode is the reverse connection protection mode, the controlling the on/off of each switching device according to the operating mode of the circuit specifically includes:
and controlling the first switching device 1, the second switching device 2, the third switching device 3 and the fourth switching device 4 to be switched off.
Preferably, the control unit 5 is a DSP.
Preferably, the resistive device is a variable resistor connected to the control unit 5, and the control unit 5 calculates a current limiting resistance value for enabling the resistive device to normally operate according to the capacitor buffering time and the discharging time and adjusts the resistance value of the variable resistor to the current limiting resistance value.
In order to solve the technical problem, the application also provides a fully-controlled rectifying circuit, which comprises the protection circuit.
The protection circuit provided by the application comprises: the second end of the first switch device is connected with the first end of the second switch device to serve as a first common end, the second end of the second switch device is connected with the negative electrode of the power supply and connected with the second end of the capacitor, the first common end is connected with the second end of the fourth switch device, the second end of the third switch device is connected with the first end of the fourth switch device to serve as a second common end, the second common end is connected with the first end of the capacitor, and all the switch devices are controlled by the control unit to be switched on and switched off to achieve the function of protecting the resistor. The first end of the resistive device is connected with the positive electrode of the power supply and the first end of the third switching device, and the second end of the resistive device is connected with the first end of the first switching device, so that the charging and discharging rate of the capacitor is controlled, the transient voltage change of the capacitor is prevented from being overlarge, and the capacitor is protected. The control unit is connected with the first switch device, the second switch device, the third switch device and the fourth switch device and is used for controlling the on-off of each switch device according to the working mode of the circuit so as to switch the working mode of the protection circuit, so that the protection circuit has the functions of buffering, releasing and preventing voltage reversal in different working modes. Therefore, the protection circuit provided by the application can protect the capacitor at different stages through a single protection circuit, and a plurality of circuits with different functions are not required to be connected into the circuit, so that the rectification circuit is simplified, and the circuit cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application, the drawings needed for the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is an application scenario diagram of a protection circuit according to an embodiment of the present application;
fig. 2 is a structural diagram of a protection circuit according to an embodiment of the present disclosure;
fig. 3 is a structural diagram of a protection circuit operating in a buffer mode according to an embodiment of the present application;
fig. 4 is a structural diagram of a protection circuit operating in a normal operating mode according to an embodiment of the present application;
fig. 5 is a structural diagram of a protection circuit operating in a bleeding mode according to an embodiment of the present application;
fig. 6 is a structural diagram of a protection circuit operating in a reverse-reverse protection mode according to an embodiment of the present application;
the reference numbers are as follows: 1 is a first switching device, 2 is a second switching device, 3 is a third switching device, 4 is a fourth switching device, and 5 is a control unit.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the present application.
The core of the application is to provide a protection circuit and a fully-controlled rectifying circuit.
In order that those skilled in the art will better understand the disclosure, the following detailed description will be given with reference to the accompanying drawings.
Fig. 1 is an application scenario diagram of a protection circuit according to an embodiment of the present application, where S1, S2, S3, and S4 are all switching tubes, a control end of each switching tube is connected to the control unit 5, a front end of the protection circuit is connected to an output end of the rectification circuit, a rear end of the protection circuit is connected to the capacitor C, and R is a resistive device. As shown in fig. 1, the input terminal of the protection circuit is connected to the output terminal of the rectifying circuit, and is configured to obtain a dc electrical signal output by the rectifying circuit, thereby completing a task of charging and discharging the capacitor C. When the rectifying circuit is powered on, the control unit 5 controls the first switching tube S1, the second switching tube S2, the third switching tube S3 and the fourth switching tube S4 to be turned off, so that the connection between the capacitor C and the rectifying circuit is disconnected, and the capacitor C and subsequent circuits are prevented from being damaged due to reverse connection of the circuit. When the rectifying circuit is powered on, the control unit 5 controls the first switching device 1 to be switched on, the second switching tube S2, the third switching tube S3 and the fourth switching tube S4 to be switched off, and the resistive device R is switched in the circuit to slow down the charging speed of the capacitor C. When the capacitor C is charged after the rectifier circuit is powered on, the control unit 5 controls the third switching device 3 to be turned on, and the first switching tube S1, the second switching tube S2 and the fourth switching tube S4 are all turned off, so that the capacitor C works normally. When the rectifying circuit is turned off and the capacitor C discharges, the control unit 5 controls the first switching tube S1 and the second switching tube S2 to be turned on, and the first switching tube S1, the second switching tube S2, the third switching tube S3 and the fourth switching tube S4 to be turned off, so that the resistive device R is connected to the circuit, and the discharging speed of the capacitor C is slowed down.
It is understood that the switching device in the embodiment of the present application may be a transistor, a MOS transistor, or another switching device capable of being controlled by the control unit 5, and is not limited herein.
Fig. 2 is a structural diagram of a protection circuit according to an embodiment of the present application, and as shown in fig. 2, the protection circuit includes:
the circuit comprises a control unit 5, a resistive device R, a first switching device 1, a second switching device 2, a third switching device 3 and a fourth switching device 4;
the control unit 5 is connected with the first switch device 1, the second switch device 2, the third switch device 3 and the fourth switch device 4, and is used for controlling the on-off of each switch device according to the working mode of the circuit;
the first end of the resistive device R is connected with the positive electrode of the power supply and the first end of the third switching device 3, and the second end of the resistive device R is connected with the first end of the first switching device 1 so as to control the discharge rate of the capacitor C;
a second end of the first switching device 1 is connected with a first end of the second switching device 2 to serve as a first common end, a second end of the second switching device 2 is connected with a negative electrode of a power supply and a second end of the capacitor C, and the first common end is connected with a second end of the fourth switching device 4;
a second terminal of the third switching device 3 is connected to a first terminal of the fourth switching device 4 as a second common terminal, which is connected to a first terminal of the capacitor C.
In concrete implementation, the protection circuit can be applied to four different working stages of the rectifier circuit, namely the rectifier circuit is electrified in the twinkling of an eye, when the rectifier circuit is electrified (namely the electric capacity C process of charging), the rectifier circuit normally works, when the rectifier circuit cuts off the power supply (namely the electric capacity C process of discharging), correspondingly, the protection circuit includes four different working modes: the device comprises a buffer mode, a normal working mode, a discharge mode and an anti-reverse connection protection mode.
It can be understood that the switching device in the embodiment of the present application may be a transistor, an MOS transistor, or another switching device capable of being controlled by the control unit 5 to be turned on or off, and in order to better protect the capacitor C and other devices connected to the protection circuit and subsequent circuits, the switching device used in the embodiment is an MOS transistor with a body diode.
It should be noted that the resistive device R may be a single resistor or a combination of multiple resistors, and when the protection circuit is in the buffer mode, the resistive device R is used to reduce the intensity of a current signal in the circuit; the resistive device R is used to dissipate power in the circuit when the protection circuit is in the bleed mode. The number, type and resistance of the resistors can be determined by the designer according to the working environment of the circuit, and are not limited herein.
It can be understood that a device with a variable resistance value can be used as the resistive device R, so that the charging and discharging rate of the capacitor C can be controlled by changing the resistance value of the resistive device R, and the working efficiency of the circuit can be improved on the basis of ensuring the safety of the capacitor C.
In specific implementation, the control unit 5 may be an external computer or embedded chips such as a DSP and an FPGA, and the embedded chip is usually used as the control unit 5 because the operating environment of the inverter circuit is complex. Wherein, because the DSP chip has stronger control ability and digital signal processing ability, this application chooses DSP chip as the control unit 5 for use.
If the working mode is the buffering mode, the control unit 5 controls the first switching device 1 to be turned on, and the second switching device 2, the third switching device 3 and the fourth switching device 4 are all turned off. At the moment when the protection circuit is switched on, the capacitor C can be charged, at the moment, the resistive device R is switched into the circuit, and the current intensity in the circuit is reduced through the resistive device R, so that the charging speed of the capacitor C is reduced, and the circuit devices such as the capacitor C are prevented from being damaged.
If the working mode is the normal working mode, the control unit 5 controls the third switching device 3 to be turned on, and the first switching device 1, the second switching device 2 and the fourth switching device 4 are all turned off. And the resistive device R is disconnected, and at the moment, the voltage drop in the protection circuit is the conduction voltage drop of the switching tube, so that the conduction loss is reduced.
If the working mode is the discharging mode, the control unit 5 controls the first switching device 1 and the second switching device 2 to be both switched on, the third switching device 3 and the fourth switching device 4 to be both switched off, so that the capacitor C can be discharged, and meanwhile, the resistive device R is switched in the circuit to slow down the discharging speed of the capacitor C, so that the phenomenon that the devices in the circuit are damaged due to the fact that the capacitor C is discharged too fast is prevented.
It can be understood that the first switching device 1, the second switching device 2, the third switching device 3, and the fourth switching device 4 provided in the embodiment of the present application may be independent switching devices, or may also be an integrated module, and are not limited herein.
If the working mode is the reverse connection prevention protection mode, the control unit 5 controls the first switching device 1, the second switching device 2, the third switching device 3 and the fourth switching device 4 to be switched off. When the positive and negative poles at the two ends of the capacitor C are reversely connected, the voltage at the two ends of the capacitor C is clamped to the diode voltage drop by using the body diodes of the second switching device 2, the third switching device 3 and the fourth switching device 4, so that the capacitor C is protected from being damaged.
An embodiment of the present application provides a protection circuit, including: the second end of the first switch device is connected with the first end of the second switch device to serve as a first common end, the second end of the second switch device is connected with the negative electrode of the power supply and connected with the second end of the capacitor, the first common end is connected with the second end of the fourth switch device, the second end of the third switch device is connected with the first end of the fourth switch device to serve as a second common end, the second common end is connected with the first end of the capacitor, and all the switch devices are controlled by the control unit to be switched on and switched off to achieve the function of protecting the resistor. The first end of the resistive device is connected with the positive electrode of the power supply and the first end of the third switching device, and the second end of the resistive device is connected with the first end of the first switching device, so that the charging and discharging rate of the capacitor is controlled, the transient voltage change of the capacitor is prevented from being overlarge, and the capacitor is protected. The control unit is connected with the first switch device, the second switch device, the third switch device and the fourth switch device and is used for controlling the on-off of each switch device according to the working mode of the circuit so as to switch the working mode of the protection circuit, so that the protection circuit has the functions of buffering, releasing and preventing voltage reversal in different working modes. Therefore, the protection circuit provided by the application can protect the capacitor at different stages through a single protection circuit, and a plurality of circuits with different functions are not required to be connected into the circuit, so that the rectification circuit is simplified, and the circuit cost is reduced.
As a preferred embodiment, the protection circuit provided by the present application includes:
the protection circuit comprises four working modes, namely a buffer mode, a normal working mode, a discharge mode and an anti-reverse connection protection mode, so that the protection resistor and the post-stage circuit are protected at different stages in the operation process of the rectification circuit.
In specific implementation, at the moment when the protection circuit is turned on, the capacitor C is charged by using the current transmitted by the rectifying circuit, and in order to protect the capacitor C from being broken down, the resistive device R needs to be connected in series in the circuit to slow down the charging speed of the capacitor C.
For protecting the capacitor C, if the working mode is the buffer mode on the basis of the embodiment, controlling the on/off of each switching device according to the working mode of the circuit specifically includes:
and controlling the first switching device 1 to be switched on, and switching off the second switching device 2, the third switching device 3 and the fourth switching device 4. It can be understood that, since the MOS transistor with the body diode is adopted as the fourth switching device 4, the structure of the protection circuit is shown in fig. 3, and it can be seen that, at this time, the fourth switching device 4 is in an off state, but the body diode R4 assists in completing the buffering operation.
In this embodiment, by controlling the first switching device to be turned on, the second switching device, the third switching device and the fourth switching device are all turned off to slow down the charging speed of the capacitor, so as to prevent the capacitor from being damaged.
In specific implementation, after the resistive device R is connected into a circuit, the internal resistance of an input side can be increased, the working characteristic of a rear-stage circuit is influenced, and the power density of the rear-stage circuit can be reduced after the resistive device R is connected into the circuit for a long time.
In order to improve the operating characteristics of the subsequent circuit, on the basis of the above embodiment, if the operating mode is the normal operating mode, controlling the on/off of each switching device according to the operating mode of the circuit specifically includes:
and controlling the third switching device 3 to be switched on, and switching off the first switching device 1, the second switching device 2 and the fourth switching device 4.
Fig. 4 is a structural diagram of a protection circuit operating in a normal operating mode according to an embodiment of the present application, and as shown in fig. 4, at this time, the protection circuit reduces an internal resistance of an input-side circuit by disconnecting a resistive device R from the protection circuit, so that a voltage drop of the input-side resistance is reduced, and a power density of a subsequent-stage circuit is improved.
It is understood that a detection circuit may be further added to the protection circuit, and when the input voltage is detected to be too high, the third switching device 3 is controlled to be turned off to prevent the circuit of the subsequent stage from being damaged.
In this embodiment, the first switching device, the second switching device, and the fourth switching device are all turned off by turning on the control device, so that the influence of the long-time access of the resistive device R to the circuit on the operating characteristics of the rear-stage circuit is prevented, and the power density of the rear-stage circuit is improved.
In the specific implementation, the capacitor C needs to be discharged to reduce the voltage across the capacitor C, so as to prevent the capacitor C from being broken down.
On the basis of the above embodiment, if the operation mode is the bleeding mode, controlling the on/off of each switching device according to the operation mode of the circuit specifically includes:
and controlling the first switching device 1 and the second switching device 2 to be turned on, and controlling the third switching device 3 and the fourth switching device 4 to be turned off. Further, in order to protect the capacitor C, the discharge speed of the capacitor C needs to be reduced through the resistor, and at this time, the resistive device R is multiplexed into a bleed-off resistor to reduce the discharge speed of the capacitor C, so that the damage of devices in the circuit due to the fact that the capacitor C discharges too fast is prevented. Fig. 5 is a structural diagram of a protection circuit operating in a bleeding mode according to an embodiment of the present application, where as shown in fig. 5, the third switching device 3 is in an off state, but a body diode R3 thereof may participate in the bleeding operation to slow down the discharging speed of the capacitor C.
It is noted that the protection circuit operating in the bleeder mode may also be used to discharge a preceding stage circuit in parallel with the protection circuit.
In this embodiment, by controlling the first switching device and the second switching device to be turned on, the third switching device and the fourth switching device are turned off to reduce the voltage across the capacitor to be below the safe voltage, so as to prevent the capacitor from being broken down and protect the operator.
In the specific implementation, if the voltage input by the rectifying circuit to the capacitor is reversely connected, the capacitor C and the post-stage circuit are damaged; if the circuit at the rear stage of the capacitor C is reversely connected, the capacitor C can be damaged and even the circuit can be failed.
In order to avoid a circuit fault caused by reverse connection of a circuit, on the basis of the above embodiment, if the operating mode is the reverse connection prevention protection mode, controlling the on/off of each switching device according to the operating mode of the circuit specifically includes:
and controlling the first switching device 1, the second switching device 2, the third switching device 3 and the fourth switching device 4 to be switched off. When the input voltage is reversely connected, the protection circuit is in a broken circuit state, and the capacitor C is disconnected with the rectification circuit, so that the capacitor C and the post-stage circuit are prevented from being damaged. Fig. 6 is a structural diagram of a protection circuit operating in a reverse-reverse protection mode according to an embodiment of the present application, and as shown in fig. 6, when positive and negative poles of a voltage input to a capacitor by a rectifier circuit are reverse, a body diode R2 of a second switching device 2, a body diode R3 of a third switching device 3, and a body diode R4 of a fourth switching device 4 are all connected to the protection circuit, so as to clamp a voltage of a capacitor C on an input side to a conduction voltage drop of 3 diodes.
Further, when the output circuit of the subsequent stage of the capacitor C is reversely connected, the body diode R2 of the second switching device 2 and the body diode R4 of the fourth switching device 4 are connected into the circuit, and the voltage across the output side capacitor C is clamped to the conduction voltage drop of 2 diodes, thereby protecting the capacitor C and the previous stage circuit.
It should be noted that when the circuit fails to cause excessive current in the circuit, the switching device can be disabled preferentially to protect the capacitor C and the subsequent circuit.
In the embodiment, the first switching device, the second switching device, the third switching device and the fourth switching device are controlled to be switched off, so that the situation that the capacitor and the circuit are damaged due to reverse connection of the voltage input by the protection circuit to the capacitor is prevented.
In specific implementation, the control unit 5 may be an external computer or embedded chips such as a DSP and an FPGA, and the embedded chip is usually used as the control unit 5 because the operating environment of the inverter circuit is severe. Wherein, because the DSP chip has stronger control ability and digital signal processing ability, this application chooses DSP chip as the control unit 5 for use.
On the basis of the above embodiment, the control unit 5 of the protection circuit is a DSP.
In this embodiment, by selecting a DSP chip as the control circuit of the inverter control circuit, the ability of the control circuit to adapt to the environment is improved, and the digital signal processing ability of the control unit is improved
In specific implementation, the capability of the resistive device R to reduce the charging and discharging speed of the capacitor C is determined by the resistance value of the resistor and the value of the capacitor C, so that when the capacitor C or a subsequent circuit changes, the resistor with a proper resistance value needs to be replaced to ensure the protection capability of the resistive device R on the capacitor C, but frequent replacement of the resistor increases the circuit design cost and the hardware cost.
To solve this problem, based on the above embodiment, the resistive device R is a variable resistor connected to the control unit 5, and the control unit 5 calculates a current limiting resistance value for normally operating the resistive device R according to the buffer time and the bleed time of the capacitor C and adjusts the resistance value of the variable resistor to the current limiting resistance value.
It can be understood that the resistive device R may be a carbon film resistor, a cement resistor, a metal film resistor, a wire-wound resistor, etc., where the type of the resistor is not limited, and the resistance value of the resistor may meet the buffer time, the bleeding time, and the power requirement of the protection circuit.
In this embodiment, the variable resistor is selected as the resistive device, so that the requirement of the protection circuit can be met under the control of the control unit, the circuit design cost and the hardware cost are reduced, and the application range of the protection circuit is expanded.
In a specific implementation, the switching tube includes a MOS tube and a triode, wherein the triode is mostly used for a current driving circuit, and the MOS tube is a voltage control device and is commonly used for a voltage driving circuit. The MOS tube has the advantages of low power consumption and high output impedance, and has good temperature characteristic and noise characteristic, so that the circuit is more stable. In specific implementation, the MOS transistor has an upper limit frequency far higher than that of the triode, which is safer and more stable, so the MOS transistor is usually selected as the switching device.
The MOS transistor includes an NMOS transistor and a PMOS transistor, which is not limited herein.
On the basis of the above embodiments, the first switching device 1, the second switching device 2, the third switching device 3, and the fourth switching device 4 are all MOS transistors with body diodes
In this embodiment, the MOS transistor with the body diode is used as the switching device, so that the power consumption of the circuit can be reduced, and the circuit is more stable and reliable. Meanwhile, the body diode of the switching device can also assist in achieving a caching function, a bleeding function and an anti-reverse function.
Finally, the application also provides a fully-controlled rectifying circuit, which comprises a front-stage rectifying circuit and a rear-stage circuit connected with the output end of the protection circuit besides the protection circuit. Since the components of the protection circuit are described in detail above, the description of this embodiment is omitted.
In this embodiment, a fully controlled rectifier circuit is provided, which includes the protection circuit described above, and the protection circuit includes: the second end of the first switch device is connected with the first end of the second switch device to serve as a first common end, the second end of the second switch device is connected with the negative electrode of the power supply and connected with the second end of the capacitor, the first common end is connected with the second end of the fourth switch device, the second end of the third switch device is connected with the first end of the fourth switch device to serve as a second common end, the second common end is connected with the first end of the capacitor, and all the switch devices are controlled by the control unit to be switched on and switched off to achieve the function of protecting the resistor. The first end of the resistive device is connected with the positive electrode of the power supply and the first end of the third switching device, and the second end of the resistive device is connected with the first end of the first switching device, so that the charging and discharging rate of the capacitor is controlled, the transient voltage change of the capacitor is prevented from being overlarge, and the capacitor is protected. The control unit is connected with the first switch device, the second switch device, the third switch device and the fourth switch device and is used for controlling the on-off of each switch device according to the working mode of the circuit so as to switch the working mode of the protection circuit, so that the protection circuit has the functions of buffering, releasing and preventing voltage reversal in different working modes. Therefore, the protection circuit provided by the application can protect the capacitor at different stages through a single protection circuit, and a plurality of circuits with different functions are not required to be connected into the circuit, so that the rectification circuit is simplified, and the circuit cost is reduced.
The protection circuit and the fully controlled rectifier circuit provided by the application are described in detail above. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. A protection circuit, comprising:
the circuit comprises a resistive device, a first switching device (1), a second switching device (2), a third switching device (3), a fourth switching device (4) and a control unit (5);
the control unit (5) is connected with the first switch device (1), the second switch device (2), the third switch device (3) and the fourth switch device (4) and is used for controlling the on-off of each switch device according to the working mode of the circuit;
the first end of the resistive device is connected with the positive electrode of the power supply and the first end of the third switching device (3), and the second end of the resistive device is connected with the first end of the first switching device (1) so as to control the discharge rate of the capacitor;
the second end of the first switching device (1) is connected with the first end of the second switching device (2) to serve as a first common end, the second end of the second switching device (2) is connected with the negative electrode of the power supply and the second end of the capacitor, and the first common end is connected with the second end of the fourth switching device (4);
and the second end of the third switching device (3) is connected with the first end of the fourth switching device (4) to serve as a second common end, and the second common end is connected with the first end of the capacitor.
2. The protection circuit according to claim 1, wherein the first switching device (1), the second switching device (2), the third switching device (3) and the fourth switching device (4) are all MOS transistors with body diodes.
3. The protection circuit of claim 2, wherein the operating mode comprises:
the device comprises a buffer mode, a normal working mode, a discharge mode and an anti-reverse connection protection mode.
4. The protection circuit according to claim 3, wherein if the operation mode is the buffer mode, the controlling the on/off of each switching device according to the operation mode of the circuit specifically comprises:
and controlling the first switching device (1) to be switched on, and switching off the second switching device (2), the third switching device (3) and the fourth switching device (4).
5. The protection circuit according to claim 3, wherein if the operating mode is the normal operating mode, the controlling the on/off of each switching device according to the operating mode of the circuit specifically comprises:
and controlling the third switching device (3) to be turned on, and turning off the first switching device (1), the second switching device (2) and the fourth switching device (4).
6. The protection circuit according to claim 3, wherein if the operation mode is the bleeding mode, the controlling the on/off of each switching device according to the operation mode of the circuit specifically comprises:
and controlling the first switching device (1) and the second switching device (2) to be turned on, and controlling the third switching device (3) and the fourth switching device (4) to be turned off.
7. The protection circuit according to claim 3, wherein if the operating mode is the reverse connection prevention protection mode, the controlling the on/off of each switching device according to the operating mode of the circuit specifically comprises:
controlling the first switching device (1), the second switching device (2), the third switching device (3) and the fourth switching device (4) to be turned off.
8. Protection circuit according to claim 1, characterized in that the control unit (5) is a DSP.
9. The protection circuit according to claim 3, wherein the resistive device is a variable resistor connected to the control unit (5), and the control unit (5) calculates a current limiting resistance value for normally operating the resistive device according to the buffer time and the bleed-off time of the capacitor and adjusts the resistance value of the variable resistor to the current limiting resistance value.
10. A fully controlled rectifier circuit comprising the protection circuit of any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111447402.2A CN114362499B (en) | 2021-11-30 | 2021-11-30 | Protection circuit and full-control rectifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111447402.2A CN114362499B (en) | 2021-11-30 | 2021-11-30 | Protection circuit and full-control rectifying circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114362499A true CN114362499A (en) | 2022-04-15 |
| CN114362499B CN114362499B (en) | 2024-02-02 |
Family
ID=81097403
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111447402.2A Active CN114362499B (en) | 2021-11-30 | 2021-11-30 | Protection circuit and full-control rectifying circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114362499B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120069480A1 (en) * | 2009-06-09 | 2012-03-22 | Xianfang Wang | Method, device and switch for providing short-circuit protection for resistive ac load |
| CN103311895A (en) * | 2013-05-28 | 2013-09-18 | 南车株洲电力机车研究所有限公司 | Under-voltage protection device and system of converter control system |
| CN112310937A (en) * | 2020-10-16 | 2021-02-02 | 浪潮电子信息产业股份有限公司 | Slow start protection circuit and circuit protection integrated chip |
| CN113422505A (en) * | 2021-07-08 | 2021-09-21 | 上海芯龙半导体技术股份有限公司南京分公司 | Voltage overshoot protection circuit, switching power supply chip and switching power supply system |
-
2021
- 2021-11-30 CN CN202111447402.2A patent/CN114362499B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120069480A1 (en) * | 2009-06-09 | 2012-03-22 | Xianfang Wang | Method, device and switch for providing short-circuit protection for resistive ac load |
| CN103311895A (en) * | 2013-05-28 | 2013-09-18 | 南车株洲电力机车研究所有限公司 | Under-voltage protection device and system of converter control system |
| CN112310937A (en) * | 2020-10-16 | 2021-02-02 | 浪潮电子信息产业股份有限公司 | Slow start protection circuit and circuit protection integrated chip |
| CN113422505A (en) * | 2021-07-08 | 2021-09-21 | 上海芯龙半导体技术股份有限公司南京分公司 | Voltage overshoot protection circuit, switching power supply chip and switching power supply system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114362499B (en) | 2024-02-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2728731B1 (en) | Stored electric power discharging circuit for inverter | |
| JPH08103023A (en) | Voltage clamping circuit | |
| US4661879A (en) | Overcurrent protection circuit for line circuits in a switching system | |
| US9088157B2 (en) | Boost type power converting apparatus with protection circuit | |
| CN116667301B (en) | High-compatibility impact current suppression circuit | |
| CN109347466B (en) | Switching circuit and electronic equipment | |
| CN114667656B (en) | Hybrid circuit breaker, hybrid circuit breaking system and circuit breaking method | |
| CN219204076U (en) | High-side driving output circuit | |
| CN114362499A (en) | Protection circuit and full-control rectification circuit | |
| CN108512191B (en) | Surge protection circuit, electronic equipment and surge protection method of circuit | |
| JP6590437B2 (en) | Semiconductor power converter | |
| KR20150068310A (en) | Battery state monitoring circuit and battery device | |
| US8687335B2 (en) | Electronic circuit breaker of a power supply having dual output ports | |
| CN213693459U (en) | Overcurrent protection circuit and electrical equipment | |
| JP2019071239A (en) | Direct current cutout gear | |
| CN217445249U (en) | Power protection circuit and electronic equipment | |
| CN109217655B (en) | Power supply capable of prolonging maintenance time after power failure | |
| CN109842089B (en) | Input protection circuit | |
| GB2130831A (en) | Electronic switching apparatus | |
| CN221103316U (en) | Energy absorption loop, electronic switch driving circuit and electronic switch with surge protection and constant current control | |
| CN111614070B (en) | Bypass protection circuit, method and uninterrupted power supply | |
| CN219351534U (en) | Soft start circuit and single-phase inverter circuit | |
| CN219659695U (en) | Driving circuit and electronic device | |
| CN220673620U (en) | PFC circuit, power supply device and electrical equipment | |
| CN220822623U (en) | DC power supply protection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20220620 Address after: 363000 No. 11, Jinxing Road, Xiangcheng District, Zhangzhou City, Fujian Province Applicant after: Zhangzhou Kehua Electric Technology Co.,Ltd. Address before: 363000 Beidou Industrial Park, Jinfeng Industrial Area, Fujian, Zhangzhou Applicant before: ZHANGZHOU KEHUA TECHNOLOGY Co.,Ltd. Applicant before: Kehua Data Co.,Ltd. |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |