CN114172121B - Control circuit of power supply - Google Patents
Control circuit of power supply Download PDFInfo
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- CN114172121B CN114172121B CN202210123610.5A CN202210123610A CN114172121B CN 114172121 B CN114172121 B CN 114172121B CN 202210123610 A CN202210123610 A CN 202210123610A CN 114172121 B CN114172121 B CN 114172121B
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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
- H02H7/10—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 converters; for rectifiers
- H02H7/12—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 converters; for rectifiers for static converters or rectifiers
- H02H7/1203—Circuits independent of the type of conversion
Abstract
The invention discloses a control circuit of a power supply, wherein the control circuit of the power supply comprises: the laser power supply comprises a voltage control circuit, a current control circuit and a turn-off circuit, wherein the input end of the voltage control circuit is connected with a laser power supply, and the voltage control end of the voltage control circuit is connected with the first control end of the turn-off circuit; the input end of the current control circuit is connected with the laser power supply, the output end of the current control circuit is connected with the input end of the turn-off circuit, the current control end of the current control circuit is connected with the second control end of the turn-off circuit, and the output end of the turn-off circuit is used as the power output end of the control circuit of the power supply and is connected with a device to be supplied with power. By adopting the technical scheme, the problems that the reliability of the laser power supply is low and the like in the related technology are solved.
Description
Technical Field
The invention relates to the field of power supply control, in particular to a control circuit of a power supply.
Background
As the power of the laser is increased, the laser is widely used in the fields of industry, laser processing and the like, and the reliability of the power supply is required to be higher.
In the prior art, a voltage dependent resistor on the lightning protection plate is often used for stabilizing and protecting a power supply and a device powered by the power supply, such as a laser, but the lightning protection plate has low control precision and is difficult to stabilize and protect the power supply and the device powered by the power supply in time, and in addition, the manufacturing cost of the lightning protection plate is high.
Aiming at the problems of low reliability of a laser power supply and the like in the related art, an effective solution is not provided yet.
Disclosure of Invention
The embodiment of the invention provides a control circuit of a power supply, which is used for at least solving the problems of low reliability and the like of a laser power supply in the related art.
According to an embodiment of the present invention, there is provided a control circuit of a power supply, including: a voltage control circuit, a current control circuit, and a shutdown circuit, wherein,
the input end of the voltage control circuit is connected with a laser power supply, and the voltage control end of the voltage control circuit is connected with the first control end of the turn-off circuit;
the input end of the current control circuit is connected with the laser power supply, the output end of the current control circuit is connected with the input end of the turn-off circuit, the current control end of the current control circuit is connected with the second control end of the turn-off circuit, and the output end of the turn-off circuit is used as the power supply output end of the control circuit of the power supply and is connected with a device to be supplied with power;
the voltage control circuit is used for controlling the turn-off circuit through the voltage control end according to the output voltage of the laser power supply and a preset voltage;
the current control circuit is used for controlling the turn-off circuit through the current control end according to the output current and the preset current of the laser power supply;
and the turn-off circuit is used for protecting the device to be powered according to the first control signal transmitted by the voltage control circuit and the second control signal transmitted by the current control circuit.
Optionally, the voltage control circuit includes: a first amplifier, a first diode, and a first capacitor, wherein,
the positive input end of the first amplifier is used as the input end of the voltage control circuit and is connected with the laser power supply;
the cathode input end of the first amplifier is connected with the cathode of the first diode, and the anode of the first diode is grounded;
the first capacitor is connected between the negative input terminal of the first amplifier and the output terminal of the first amplifier.
Optionally, the current control circuit includes: a first resistor, a second diode, a second amplifier, and a second capacitor, wherein,
one end of the first resistor, the cathode of the second diode and the anode input end of the second amplifier are used as the input ends of the current control circuit, the other end of the first resistor, the anode of the second diode and the cathode input end of the second amplifier are used as the output ends of the current control circuit, and the output end of the second amplifier is used as the current control end of the current control circuit;
the second capacitor is connected between the negative input terminal of the second amplifier and the output terminal of the second amplifier.
Optionally, the shutdown circuit includes: a third diode, a fourth diode, a first field effect transistor, and a second field effect transistor, wherein,
the anode of the third diode is used as the first control end of the turn-off circuit, the anode of the fourth diode is used as the second control end of the turn-off circuit, and the cathode of the third diode and the cathode of the fourth diode are both connected with the base electrode of the first field effect transistor;
the emitter of the first field effect transistor is grounded, and the collector of the first field effect transistor is connected with the grid of the second field effect transistor;
and the drain electrode of the second field effect transistor is used as the input end of the turn-off circuit, and the source electrode of the second field effect transistor is used as the output end of the turn-off circuit.
Optionally, the control circuit of the power supply further comprises a sampling circuit, wherein,
the output end of the sampling circuit is connected with the grid electrode of the second field effect transistor;
and the input end of the sampling circuit is connected with the power output end of the control circuit of the power supply.
Optionally, the sampling circuit includes a second resistor, a third resistor, a fourth resistor, a fifth resistor, a third amplifier, a fifth diode, and a third capacitor, wherein,
one end of the second resistor is used as an input end of the sampling circuit, the other end of the second resistor is connected with one end of the third resistor, the other end of the third resistor is grounded, and one end of the fourth resistor is connected with one end of the third resistor;
the negative electrode input end of the third amplifier is connected with the other end of the fourth resistor, the positive electrode input end of the third amplifier is connected with the cathode of the fifth diode, and the anode of the fifth diode is grounded;
the fifth resistor and the third capacitor are connected in series between the negative input end of the third amplifier and the output end of the third amplifier.
Optionally, the control circuit of the power supply further includes: and the output end of the sampling circuit is connected with the grid electrode of the second field effect transistor through the first protection circuit.
Optionally, the first protection circuit includes: a sixth diode, a third field effect transistor, and a fourth field effect transistor, wherein,
the output end of the sampling circuit is respectively connected with the base electrode of the third field effect transistor and the base electrode of the fourth field effect transistor, the cathode of the sixth diode is connected with the emitting electrode of the third field effect transistor, and the anode of the sixth diode and the emitting electrode of the fourth field effect transistor are connected with the emitting electrode of the first field effect transistor;
and the collector electrode of the third field effect transistor is connected with the collector electrode of the fourth field effect transistor and then connected with the grid electrode of the second field effect transistor.
Optionally, the control circuit of the power supply further includes: a second protection circuit, wherein the second protection circuit comprises: and the cathode of the seventh diode is connected with the grid electrode of the second field effect transistor, and the anode of the seventh diode is connected with the source electrode of the second field effect transistor.
Optionally, the control circuit of the power supply further includes: a filter circuit and a voltage stabilizing circuit, wherein,
the input end of the filter circuit is connected with the laser power supply, and the output end of the filter circuit is connected with the input end of the voltage stabilizing circuit;
the output end of the voltage stabilizing circuit is grounded;
the filter circuit is used for reducing the electromagnetic interference of the laser power supply;
the voltage stabilizing circuit is used for stabilizing the voltage of the laser power supply.
In an embodiment of the present invention, a control circuit of a power supply includes: the laser power supply comprises a voltage control circuit, a current control circuit and a turn-off circuit, wherein the input end of the voltage control circuit is connected with a laser power supply, and the voltage control end of the voltage control circuit is connected with the first control end of the turn-off circuit; the input end of the current control circuit is connected with a laser power supply, the output end of the current control circuit is connected with the input end of the turn-off circuit, the current control end of the current control circuit is connected with the second control end of the turn-off circuit, and the output end of the turn-off circuit, which is used as the power supply output end of the control circuit of the power supply, is connected with a device to be supplied with power; the voltage control circuit is used for controlling the turn-off circuit through a voltage control end according to the output voltage of the laser power supply and a preset voltage; the current control circuit is used for controlling the turn-off circuit through the current control end according to the output current and the preset current of the laser power supply; the power supply comprises a voltage control circuit, a current control circuit and a turn-off circuit, wherein the turn-off circuit is used for protecting a device to be supplied with power according to a first control signal transmitted by the voltage control circuit and a second control signal transmitted by the current control circuit, namely the control circuit of the power consists of the voltage control circuit, the current control circuit and the turn-off circuit; the voltage control circuit can control the turn-off circuit through the voltage control end according to the output voltage of the laser power supply and the preset voltage set by the voltage control circuit, the current control circuit can control the turn-off circuit through the current control end according to the output current of the laser power supply and the preset current set by the current control circuit, and the turn-off circuit can protect the device to be powered according to the first control signal transmitted by the voltage control circuit and the second control signal transmitted by the current control circuit. By adopting the technical scheme, the problems of low reliability of the laser power supply and the like in the related technology are solved, and the technical effect of improving the reliability of the laser power supply is realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a block diagram of a control circuit of a power supply according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the connection of an alternative voltage control circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the connection of an alternative current control circuit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of the connection of an alternative shutdown circuit according to an embodiment of the invention;
FIG. 5 is a schematic diagram of the connection of an alternative sampling circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the connection of an alternative first protection circuit according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of the connection of an alternative filter circuit according to an embodiment of the invention;
FIG. 8 is a schematic diagram illustrating the connection of an alternative voltage regulator circuit according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a control circuit of an alternative power supply according to an embodiment of the invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present embodiment, a control circuit of a power supply is provided, and fig. 1 is a block diagram of a control circuit of a power supply according to an embodiment of the present invention; as shown in fig. 1, the control circuit of the power supply includes: the laser control circuit comprises a voltage control circuit 102, a current control circuit 104 and a shutdown circuit 106, wherein an input end 102-1 of the voltage control circuit 102 is connected with a laser power supply 108, and a voltage control end 102-2 of the voltage control circuit 102 is connected with a first control end 106-1 of the shutdown circuit 106; the input end 104-1 of the current control circuit 104 is connected with the laser power supply 108, the output end 104-2 of the current control circuit 104 is connected with the input end 106-2 of the turn-off circuit 106, the current control end 104-3 of the current control circuit 104 is connected with the second control end 106-3 of the turn-off circuit 106, and the output end 106-4 of the turn-off circuit 106, which is taken as the power supply output end of the control circuit of the power supply, is connected with the device to be supplied with power 110; the voltage control circuit 102 is used for controlling the turn-off circuit 106 through a voltage control terminal 102-2 according to the output voltage of the laser power supply 108 and a preset voltage; the current control circuit 104 is used for controlling the turn-off circuit 106 through a current control terminal 104-3 according to the output current of the laser power supply 108 and a preset current; and the shutdown circuit 106 is configured to protect the device to be powered 110 according to the first control signal transmitted by the voltage control circuit 102 and the second control signal transmitted by the current control circuit 104.
Optionally, in the present embodiment, the preset voltage may be set, but not limited to, by a voltage control circuit, and the preset current may be set, but not limited to, by a current control circuit.
Optionally, in this embodiment, the first control signal may include, but is not limited to, a signal that an output voltage of the laser power supply is greater than or equal to a preset voltage, the second control signal may include, but is not limited to, a signal that an output current of the laser power supply is greater than or equal to a preset current, and in the case that the signal input to the shutdown circuit may be, but is not limited to, a signal that the output voltage of the laser power supply is greater than or equal to the preset voltage, and/or the signal that the output current of the laser power supply is greater than or equal to the preset current, the laser power supply is powered off to protect the safety of the laser power supply and the device to be powered.
The control circuit of the power supply comprises a voltage control circuit, a current control circuit and a turn-off circuit, wherein the input end of the voltage control circuit is connected with a laser power supply, the voltage control end of the voltage control circuit is connected with the first control end of the turn-off circuit, the input end of the current control circuit is connected with the laser power supply, the output end of the current control circuit is connected with the input end of the turn-off circuit, the current control end of the current control circuit is connected with the second control end of the turn-off circuit, and the output end of the turn-off circuit, which is taken as the power output end of the control circuit of the power supply, is connected with a device to be supplied with power; the voltage control circuit can control the turn-off circuit through the voltage control end according to the output voltage of the laser power supply and the preset voltage set by the voltage control circuit, the current control circuit can control the turn-off circuit through the current control end according to the output current of the laser power supply and the preset current set by the current control circuit, and the turn-off circuit can protect the device to be powered according to the first control signal transmitted by the voltage control circuit and the second control signal transmitted by the current control circuit. By adopting the technical scheme, the problems of low reliability of the laser power supply and the like in the related technology are solved, and the technical effect of improving the reliability of the laser power supply is realized.
As an alternative embodiment, the voltage control circuit may include, but is not limited to: the laser comprises a first amplifier, a first diode and a first capacitor, wherein the positive input end of the first amplifier is used as the input end of the voltage control circuit and is connected with the laser power supply; the negative electrode input end of the first amplifier is connected with the cathode of the first diode, and the anode of the first diode is grounded; the first capacitor is connected between the negative input terminal of the first amplifier and the output terminal of the first amplifier.
Optionally, in this embodiment, the voltage control circuit may include, but is not limited to, a first diode D9, a first capacitor C8 and a first amplifier U2, fig. 2 is a connection diagram of an alternative voltage control circuit according to an embodiment of the present invention, as shown in fig. 2, a cathode of the first diode D9 is connected to a negative input terminal of the first amplifier U2, an anode of the first diode D9 is grounded, an anode input terminal of the first amplifier U2 serves as an input terminal of the voltage control circuit, and the first capacitor C8 is connected between the negative input terminal of the first amplifier U2 and an output terminal of the first amplifier U2.
Optionally, in this embodiment, but not limited to, the overvoltage point of the output voltage of the laser power supply is set by selecting a parameter of the first diode D9, and if the output voltage of the laser power supply reaches the overvoltage point, the fet needs to be turned off with a delay, and the capacitance of the C8 may be changed. For example, the overvoltage point is 80V, the first diode D9 can be, but is not limited to, a TVS tube of 80V. If a more flexible overvoltage limiting point is desired, a resistor may be connected in series, but not limited to, between the positive input of the first amplifier U2 and the input of the power supply. Such as: if the set overvoltage point is 30V and the input voltage is 80V, two resistors are connected in series between the positive input terminal of the first amplifier U2 and the input terminal of the power supply, the ratio is 5/3, and the positive input side of the first amplifier U2 is connected between the resistors.
As an alternative embodiment, the current control circuit may include, but is not limited to: the current control circuit comprises a first resistor, a second diode, a second amplifier and a second capacitor, wherein one end of the first resistor, the cathode of the second diode and the anode input end of the second amplifier are used as input ends of the current control circuit, the other end of the first resistor, the anode of the second diode and the cathode input end of the second amplifier are used as output ends of the current control circuit, and the output end of the second amplifier is used as a current control end of the current control circuit; the second capacitor is connected between the negative input terminal of the second amplifier and the output terminal of the second amplifier.
Optionally, in this embodiment, the current control circuit may include, but is not limited to, a first resistor R2, a second diode D3, a second amplifier U1, and a second capacitor C7, fig. 3 is a connection schematic diagram of an alternative current control circuit according to an embodiment of the present invention, as shown in fig. 3, one end of the first resistor R2, a cathode of the second diode D3 and an anode input terminal of the second amplifier U1 serve as input terminals of the current control circuit, the other end of the first resistor R2, an anode of the second diode D3 and a cathode input terminal of the second amplifier U1 serve as output terminals of the current control circuit, and an output terminal of the second amplifier U1 serves as a current control terminal of the current control circuit; a second capacitor C7 is connected between the negative input of the second amplifier U1 and the output of the second amplifier U1.
Optionally, in the present embodiment, the current flowing point may be set by selecting, but not limited to, the first resistor R2 and the second diode D3. Such as: a 50V TVS (Transient Voltage super) is selected as the second diode D3, and the resistance of the first resistor R2 is 10 ohms, so that the overcurrent point of the current is 50/10= 5A.
As an alternative embodiment, the shutdown circuit may include, but is not limited to: the anode of the third diode is used as a first control end of the turn-off circuit, the anode of the fourth diode is used as a second control end of the turn-off circuit, and the cathode of the third diode and the cathode of the fourth diode are both connected with the base electrode of the first field effect transistor; the emitter of the first field effect transistor is grounded, and the collector of the first field effect transistor is connected with the grid of the second field effect transistor; and the drain electrode of the second field effect transistor is used as the input end of the turn-off circuit, and the source electrode of the second field effect transistor is used as the output end of the turn-off circuit.
Optionally, in this embodiment, the shutdown circuit may include, but is not limited to: a third diode D5, a fourth diode D4, a first fet Q2, and a second fet Q1, fig. 4 is a connection schematic diagram of an alternative turn-off circuit according to an embodiment of the present invention, as shown in fig. 4, but not limited to this, the anode of the third diode D5 may be used as a first control terminal of the turn-off circuit, the anode of the fourth diode D4 is used as a second control terminal of the turn-off circuit, and the cathode of the third diode D5 and the cathode of the fourth diode D4 are both connected to the base of the first fet Q2; the emitter of the first field effect transistor Q1 is grounded, and the collector of the first field effect transistor Q2 is connected with the grid of the second field effect transistor Q1; the drain of the second fet Q1 is used as the input of the turn-off circuit, and the source of the second fet Q1 is used as the output of the turn-off circuit.
Optionally, in this embodiment, the turn-off time of the turn-off circuit may be set by, but is not limited to, the first capacitor C8, and/or the second capacitor C7, so that when the current is greater than or equal to the preset current, and/or the voltage is greater than or equal to the preset voltage, the laser power supply is turned off according to the turn-off time set by the first capacitor C8, and/or the second capacitor C7, and the laser power supply and the device to be powered are protected.
Optionally, in this embodiment, the operation principle of the turn-off circuit may be, but is not limited to, that when the current protection signal is at a high level, the first field-effect transistor Q2 is turned on, and at this time, the gate voltage of the second field-effect transistor Q1 is zero, and the second field-effect transistor Q1 is turned off, thereby implementing overcurrent protection. When an overvoltage protection signal appears, the first field effect transistor Q2 is conducted, and the second field effect transistor Q1 is turned off to realize overvoltage protection. The common cathode connection mode of the third diode D5 and the fourth diode D4 forms an OR gate logic, and the output of any input protection signal is high level, so that the circuit can be turned off and the protection can be realized as long as an over-current protection signal and/or an over-voltage protection signal exist.
As an optional embodiment, the control circuit of the power supply further includes a sampling circuit, wherein an output terminal of the sampling circuit is connected to the gate of the second field effect transistor; and the input end of the sampling circuit is connected with the power output end of the control circuit of the power supply.
Optionally, in this embodiment, the sampling circuit may be, but is not limited to, used for performing voltage stabilization control on the whole circuit according to the collected voltage.
As an alternative embodiment, the sampling circuit includes a second resistor, a third resistor, a fourth resistor, a fifth resistor, a third amplifier, a fifth diode and a third capacitor, where one end of the second resistor is used as an input terminal of the sampling circuit, the other end of the second resistor is connected to one end of the third resistor, the other end of the third resistor is grounded, and one end of the fourth resistor is connected to one end of the third resistor; the negative electrode input end of the third amplifier is connected with the other end of the fourth resistor, the positive electrode input end of the third amplifier is connected with the cathode of the fifth diode, and the anode of the fifth diode is grounded; the fifth resistor and the third capacitor are connected in series between the negative input end of the third amplifier and the output end of the third amplifier.
Optionally, in this embodiment, the sampling circuit may include, but is not limited to, a second resistor R5, a third resistor R6, a fourth resistor R4, a fifth resistor R3, a third amplifier U3, a fifth diode D8, and a third capacitor C9, fig. 5 is a connection schematic diagram of an optional sampling circuit according to an embodiment of the present invention, as shown in fig. 5, one end of the second resistor R5 may be used as an input end of the sampling circuit, the other end of the second resistor R5 is connected to one end of the third resistor R6, the other end of the third resistor R6 is grounded, and one end of the fourth resistor R4 is connected to one end of the third resistor R6; the negative electrode input end of the third amplifier U3 is connected with the other end of the fourth resistor R4, the positive electrode input end of the third amplifier U3 is connected with the cathode of the fifth diode D8, and the anode of the fifth diode D8 is grounded; the fifth resistor R3 and the third capacitor C9 are connected in series between the negative input terminal of the third amplifier U3 and the output terminal of the third amplifier U3.
Optionally, in this embodiment, the sampling circuit may, but is not limited to, collect a voltage between the second resistor R5 and the third resistor R6, and input the voltage to the negative input terminal of the third amplifier U3 as a sampling voltage V-, which is compared with the reference voltage V + at the positive input terminal of the third amplifier U3. The control link realizes the voltage stabilization output of the proportional-integral control voltage through the sampling voltage V-, the reference voltage V +, the fourth resistor R4, the fifth resistor R3 and the third capacitor C9, and the negative feedback regulation of the circuit is realized. Sampling voltage V-and output voltage V0The relationship of (a) is as follows:
the sampling circuit can be used for collecting voltage and then carrying out voltage stabilization control on the circuit, the maximum voltage output by the circuit can be limited, stable voltage is provided for the laser, and the stability of the laser is improved.
As an alternative embodiment, the control circuit of the power supply further comprises: and the output end of the sampling circuit is connected with the grid electrode of the second field effect transistor through the first protection circuit.
Optionally, in this embodiment, the first protection circuit may play a role in protecting devices in the sampling circuit on the one hand, and may play a role in driving the second field-effect transistor on the other hand.
As an alternative embodiment, the first protection circuit may include, but is not limited to: the output end of the sampling circuit is respectively connected with the base electrode of the third field effect transistor and the base electrode of the fourth field effect transistor, the cathode of the sixth diode is connected with the emitting electrode of the third field effect transistor, and the anode of the sixth diode and the emitting electrode of the fourth field effect transistor are connected with the emitting electrode of the first field effect transistor; and the collector electrode of the third field effect transistor is connected with the collector electrode of the fourth field effect transistor and then connected with the grid electrode of the second field effect transistor.
Optionally, in this embodiment, the first protection circuit may include, but is not limited to: a sixth diode D7, a third fet Q3 and a fourth fet Q4, fig. 6 is a connection schematic diagram of an alternative first protection circuit according to an embodiment of the present invention, as shown in fig. 6, an output terminal of the sampling circuit is connected to the base of the third fet Q3 and the base of the fourth fet Q4, respectively, a cathode of the sixth diode D7 is connected to the emitter of the third fet Q3, and an anode of the sixth diode D7 and the emitter of the fourth fet Q4 are connected to the emitter of the first fet Q2; the collector of the third fet Q3 is connected to the collector of the fourth fet Q4 and then to the gate of the second fet Q1.
Optionally, in the present embodiment, the first protection circuit may be, but is not limited to, used for driving and protecting the second fet Q1 in case that the voltage is insufficient to drive the second fet Q1.
As an alternative embodiment, the control circuit of the power supply may further include, but is not limited to: a second protection circuit, wherein the second protection circuit comprises: and the cathode of the seventh diode is connected with the grid electrode of the second field effect transistor, and the anode of the seventh diode is connected with the source electrode of the second field effect transistor.
Optionally, in this embodiment, the second protection circuit may include, but is not limited to: the seventh diode D6 and the seventh diode D6 connected to the second fet Q1 can protect the second fet Q1 in time.
As an alternative embodiment, the control circuit of the power supply may further include, but is not limited to: the laser power supply comprises a filter circuit and a voltage stabilizing circuit, wherein the input end of the filter circuit is connected with the laser power supply, and the output end of the filter circuit is connected with the input end of the voltage stabilizing circuit; the output end of the voltage stabilizing circuit is grounded; the filter circuit is used for reducing the electromagnetic interference of the laser power supply; the voltage stabilizing circuit is used for stabilizing the voltage of the laser power supply.
Optionally, in this embodiment, the filter circuit may be, but is not limited to, used for attenuating electromagnetic interference of the laser power supply and improving the capability of the laser power supply against electromagnetic interference, fig. 7 is a connection schematic diagram of an optional filter circuit according to an embodiment of the present invention, as shown in fig. 7, the filter circuit may include, but is not limited to: capacitor C1, capacitor C2, capacitor C3, capacitor C4 and inductor L1.
Optionally, in this embodiment, the voltage regulator may be, but is not limited to, configured to limit the voltage at the input terminal, and absorb a part of the surge voltage when the voltage is too large, fig. 8 is a connection diagram of an alternative voltage regulator according to an embodiment of the present invention, and as shown in fig. 8, the voltage regulator may include, but is not limited to: resistor R1, diode D1, diode D2, and capacitor C6.
Fig. 9 is a schematic structural diagram of a control circuit of an alternative power supply according to an embodiment of the present invention, and as shown in fig. 9, the control circuit of the power supply may include, but is not limited to: the circuit comprises a filter circuit, a voltage stabilizing circuit, a current control circuit, a voltage control circuit, a turn-off circuit, a sampling circuit and a protection circuit.
The filter circuit may include, but is not limited to, an EMI (Electro Magnetic Interference) filter, and the required insertion loss is obtained by setting parameters of the capacitor C1, the capacitor C2, the capacitor C3, the capacitor C4 and the inductor L1.
The voltage stabilizing circuit may include, but is not limited to, a resistor R1, a diode D1, a diode D2, a capacitor C6; and a capacitor C5 is connected between the voltage stabilizing circuit and the filter circuit.
The current control circuit may include, but is not limited to, a first resistor R2, a second diode D3, a second amplifier U1, and a second capacitor C7, and the voltage control circuit may include, but is not limited to, a first diode D9, a first capacitor C8, and a first amplifier U2.
The turn-off circuit may include, but is not limited to, a third diode D5, a fourth diode D4, a first fet Q2, and a second fet Q1.
The sampling circuit may include, but is not limited to, a second resistor R5, a third resistor R6, a fourth resistor R4, a fifth resistor R3, a third amplifier U3, a fifth diode D8, and a third capacitor C9.
The protection circuit may include, but is not limited to, a first protection circuit and a second protection circuit, wherein the first protection circuit may include, but is not limited to, a sixth diode D7, a third fet Q3 and a fourth fet Q4, the second protection circuit may include, but is not limited to, a seventh diode D6, and no current passes through a line (shown as a line directly below the second fet Q1 in fig. 9) connecting the sixth diode D7 and the second diode D3 in the second protection circuit, and the line is used for protection of the second fet Q1.
For specific examples in this embodiment, reference may be made to the examples described in the above embodiments and exemplary embodiments, and details of this embodiment are not repeated herein.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "first," "second," "third," "fourth," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
In the description of the embodiments of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally arranged when the products of the present invention are used, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements to be referred to must have specific orientations, be constructed in specific orientations, and operate, and thus, should not be construed as limiting the present invention.
It should also be noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. Specific meanings of the above terms in the embodiments of the present invention can be understood in specific cases by those of ordinary skill in the art.
In the description herein, references to the description of the term "an alternative embodiment," or "an embodiment of the invention," or "the embodiment" or the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. And the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Claims (6)
1. A control circuit for a power supply, comprising: a voltage control circuit, a current control circuit, and a shutdown circuit, wherein,
the input end of the voltage control circuit is connected with a laser power supply, and the voltage control end of the voltage control circuit is connected with the first control end of the turn-off circuit;
the input end of the current control circuit is connected with the laser power supply, the output end of the current control circuit is connected with the input end of the turn-off circuit, the current control end of the current control circuit is connected with the second control end of the turn-off circuit, and the output end of the turn-off circuit is used as the power supply output end of the control circuit of the power supply and is connected with a device to be supplied with power; the voltage control circuit is used for controlling the turn-off circuit through the voltage control end according to the output voltage of the laser power supply and a preset voltage;
the current control circuit is used for controlling the turn-off circuit through the current control end according to the output current and the preset current of the laser power supply;
the turn-off circuit is used for protecting the device to be powered according to a first control signal transmitted by the voltage control circuit and a second control signal transmitted by the current control circuit;
wherein the shutdown circuit comprises: the anode of the third diode is used as a first control end of the turn-off circuit, the anode of the fourth diode is used as a second control end of the turn-off circuit, and the cathode of the third diode and the cathode of the fourth diode are both connected with the base electrode of the first field effect transistor; the emitter of the first field effect transistor is grounded, and the collector of the first field effect transistor is connected with the grid of the second field effect transistor; the drain electrode of the second field effect transistor is used as the input end of the turn-off circuit, and the source electrode of the second field effect transistor is used as the output end of the turn-off circuit; the control circuit of the power supply further comprises a sampling circuit, wherein the output end of the sampling circuit is connected with the grid electrode of the second field effect transistor; the input end of the sampling circuit is connected with the power supply output end of the control circuit of the power supply; the control circuit of the power supply further includes: the output end of the sampling circuit is connected with the grid electrode of the second field effect transistor through the first protection circuit;
wherein the first protection circuit comprises: the output end of the sampling circuit is respectively connected with the base electrode of the third field effect transistor and the base electrode of the fourth field effect transistor, the cathode of the sixth diode is connected with the emitting electrode of the third field effect transistor, and the anode of the sixth diode and the emitting electrode of the fourth field effect transistor are connected with the emitting electrode of the first field effect transistor; and the collector electrode of the third field effect transistor is connected with the collector electrode of the fourth field effect transistor and then connected with the grid electrode of the second field effect transistor.
2. The circuit of claim 1, wherein the voltage control circuit comprises: a first amplifier, a first diode, and a first capacitor, wherein,
the positive input end of the first amplifier is used as the input end of the voltage control circuit and is connected with the laser power supply;
the negative electrode input end of the first amplifier is connected with the cathode of the first diode, and the anode of the first diode is grounded;
the first capacitor is connected between the negative input terminal of the first amplifier and the output terminal of the first amplifier.
3. The circuit of claim 1, wherein the current control circuit comprises: a first resistor, a second diode, a second amplifier, and a second capacitor, wherein,
one end of the first resistor, the cathode of the second diode and the anode input end of the second amplifier are used as the input ends of the current control circuit, the other end of the first resistor, the anode of the second diode and the cathode input end of the second amplifier are used as the output ends of the current control circuit, and the output end of the second amplifier is used as the current control end of the current control circuit;
the second capacitor is connected between the negative input terminal of the second amplifier and the output terminal of the second amplifier.
4. The circuit of claim 1, wherein the sampling circuit comprises a second resistor, a third resistor, a fourth resistor, a fifth resistor, a third amplifier, a fifth diode, and a third capacitor, wherein,
one end of the second resistor is used as an input end of the sampling circuit, the other end of the second resistor is connected with one end of the third resistor, the other end of the third resistor is grounded, and one end of the fourth resistor is connected with one end of the third resistor;
the negative electrode input end of the third amplifier is connected with the other end of the fourth resistor, the positive electrode input end of the third amplifier is connected with the cathode of the fifth diode, and the anode of the fifth diode is grounded;
the fifth resistor and the third capacitor are connected in series between the negative input end of the third amplifier and the output end of the third amplifier.
5. The circuit of claim 1, wherein the control circuit of the power supply further comprises: a second protection circuit, wherein the second protection circuit comprises: and the cathode of the seventh diode is connected with the grid electrode of the second field effect transistor, and the anode of the seventh diode is connected with the source electrode of the second field effect transistor.
6. The circuit of claim 1, wherein the control circuit of the power supply further comprises: a filter circuit and a voltage stabilizing circuit, wherein,
the input end of the filter circuit is connected with the laser power supply, and the output end of the filter circuit is connected with the input end of the voltage stabilizing circuit;
the output end of the voltage stabilizing circuit is grounded;
the filter circuit is used for reducing the electromagnetic interference of the laser power supply;
the voltage stabilizing circuit is used for stabilizing the voltage of the laser power supply.
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|---|---|---|---|
| CN202210123610.5A CN114172121B (en) | 2022-02-10 | 2022-02-10 | Control circuit of power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210123610.5A CN114172121B (en) | 2022-02-10 | 2022-02-10 | Control circuit of power supply |
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| CN114172121B true CN114172121B (en) | 2022-06-10 |
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