CN210954770U - Linear constant current source circuit with current-limiting protection - Google Patents
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- CN210954770U CN210954770U CN201922347167.6U CN201922347167U CN210954770U CN 210954770 U CN210954770 U CN 210954770U CN 201922347167 U CN201922347167 U CN 201922347167U CN 210954770 U CN210954770 U CN 210954770U
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Abstract
The utility model relates to a constant current source circuit technical field, concretely relates to take current-limiting protection's linear constant current source circuit, including being used for when sampling resistor's voltage is greater than or equal to predetermine threshold value turn-off MOS pipe Q1, be in the MOS pipe Q2 of constant current linear amplification district and be used for the sampling module to sampling resistor's current sampling, MOS pipe Q1's drain electrode connection voltage positive input, MOS pipe Q1's source electrode is connected voltage positive output end and power load positive pole respectively, DRV1 drive signal end is connected to MOS pipe Q1's grid, MOS pipe Q2's drain electrode is connected voltage negative output end and power load negative pole respectively, sampling module's one end and current sampling CS end are connected respectively to MOS pipe Q2's source electrode, DRV2 drive signal end is connected to MOS pipe Q2's grid. The linear constant current source circuit with the current-limiting protection function can quickly and effectively turn off the circuit when the output current is overlarge.
Description
Technical Field
The utility model relates to a constant current source circuit technical field, concretely relates to take current-limiting protection's linear constant current source circuit.
Background
The lasers are known as the "fastest knife", "best-line ruler", "brightest light", and "exotic laser". At present, the market of Chinese laser processing equipment occupies the largest market share of the laser market, and occupies 42 percent of the laser industry chain market. Laser technology, one of the most advanced manufacturing and processing technologies in the world, is now widely used in industrial production, communication, information processing, medical beauty, 3D sensing, military, cultural education, scientific research, and the like. The linear constant current source is applied to a laser industrial chain, and can control the pump source load of the laser by matching with the rear end of a laser power supply. For the continuous and stable operation of the laser pump source, the linear constant current source usually adopts a scheme of controlling the MOS transistor to operate in a constant current linear amplification region, so as to ensure that a stable current is output. However, due to abnormal failure for various reasons, the linear constant current source sometimes outputs abnormal current, which may damage or even burn out the laser pump source connected thereto.
SUMMERY OF THE UTILITY MODEL
For the above-mentioned not enough that overcomes prior art exists, the utility model provides a take current-limiting protection's linear constant current source circuit can be when output current is too big quick effectual turn-off circuit, protects the electrical part that the rear end is connected.
The utility model discloses a following technical scheme realizes: the utility model provides a take current-limiting protection's linear constant current source circuit, includes MOS pipe Q1 that is used for cutting off when sampling resistor's voltage is greater than or equal to and presets the threshold value, is in MOS pipe Q2 of constant current linear amplification district and is used for the sampling module to sampling resistor's current sampling, MOS pipe Q1's drain electrode connection voltage positive input end, voltage positive output end and power load are anodal are connected respectively to MOS pipe Q1's source electrode, DRV1 drive signal end is connected to MOS pipe Q1's grid, voltage negative output end and power load negative pole are connected respectively to MOS pipe Q2's drain electrode, sampling module's one end and current sampling CS end are connected respectively to MOS pipe Q2's source electrode, DRV2 drive signal end is connected to MOS pipe Q2's grid, sampling module's other end ground connection.
Preferably, the source and the gate of the MOS transistor Q1 are further connected through a resistor R1, and the source and the gate of the MOS transistor Q2 are further connected through a resistor R2.
Preferably, the MOS transistor Q1 and the MOS transistor Q2 are both of the type IRFS4310Z MOS transistors.
Preferably, the equivalent circuit of the power supply load is a plurality of diodes which are connected in series in sequence, and the sampling module comprises a sampling resistor.
Preferably, the diode is a MUR3040PT type diode.
Preferably, the sampling module includes a resistor R12, a resistor R17, a capacitor C17, a resistor R38, a capacitor C12, an OPA2376AID type operational amplifier U1B, a resistor R15, a resistor R16, a capacitor C22, a resistor R11, a resistor R8, a capacitor C6, a capacitor C9, a capacitor C4, an OPA2376AD type operational amplifier U1A, a resistor R5, a resistor R41, an MMBT4401 type triode Q6, and an MMBT4401 type triode Q5; one end of the resistor R12 is connected with a current sampling CS end, a first path at the other end of the resistor R12 is connected with one end of a resistor R38, a second path at the other end of the resistor R12 is connected with one end of a capacitor C12, a third path at the other end of the resistor R12 is connected with a positive input end of an operational amplifier U1B, a fourth path at the other end of the resistor R12 is connected with one end of a capacitor C17, the other end of the resistor R38 and the other end of the capacitor C12 are both grounded, a first path at a negative input end of the operational amplifier U1B is connected with the other end of a capacitor C17, a second path at a negative input end of the operational amplifier U1B is connected with one end of a resistor R17, a third path at a negative input end of the operational amplifier U1B is connected with one end of a capacitor C22, a fourth path at a negative input end of the operational amplifier U1B is connected with one end of a resistor R42, the other end of the, a first path of the output end of the operational amplifier U1B is connected to one end of a resistor R15, a second path of the output end of the operational amplifier U1B is connected to one end of a resistor R11, the other end of the resistor R16 is connected to the other end of the resistor R15, a first path of the other end of the resistor R11 is connected to one end of a capacitor C9, a second path of the other end of the resistor R11 is connected to one end of a resistor R8, a third path of the other end of the resistor R11 is connected to the negative input end of the operational amplifier U1A, the positive input end of the operational amplifier U1A is connected to the gate of the MOS transistor Q59638 and the D/a control signal input end, the positive voltage input electrode of the operational amplifier U1A is grounded, a first path of the negative voltage input electrode of the operational amplifier U1A is connected to the +6V input end, a second path of the negative voltage input electrode of the operational amplifier U1A is, the other end of the capacitor C4 is grounded, the first path of the output end of the operational amplifier U1A is connected with one end of the capacitor C6, the second path of the output end of the operational amplifier U1A is connected with the other end of the capacitor C9, the other end of the resistor R8 is connected with the other end of the capacitor C6, the third path of the output end of the operational amplifier U1A is connected with one end of the resistor R5, the first path of the other end of the resistor R5 is connected with the base electrode of the triode Q6, the second path of the other end of the resistor R5 is connected with the base electrode of the triode Q5, the collector electrode of the triode Q6 is connected with one end of the resistor R41, the other end of the resistor R41 is connected with a +6.5V input end, the collector of the triode Q5 is connected with a current sampling CS end, the emitter of the transistor Q5 and the emitter of the transistor Q6 are both connected to the gate of the MOS transistor Q2 through the DRV2 drive signal terminal.
The utility model has the advantages that: the utility model provides a take current-limiting protection's linear constant current source circuit, includes MOS pipe Q1 that is used for cutting off when sampling resistor's voltage is greater than or equal to and presets the threshold value, is in MOS pipe Q2 of constant current linear amplification district and is used for the sampling module to sampling resistor's current sampling, MOS pipe Q1's drain electrode connection voltage positive input end, voltage positive output end and power load are anodal are connected respectively to MOS pipe Q1's source electrode, DRV1 drive signal end is connected to MOS pipe Q1's grid, voltage negative output end and power load negative pole are connected respectively to MOS pipe Q2's drain electrode, sampling module's one end and current sampling CS end are connected respectively to MOS pipe Q2's source electrode, DRV2 drive signal end is connected to MOS pipe Q2's grid, sampling module's other end ground connection. According to the linear constant current source circuit with the current-limiting protection function, if the voltage of an external given analog quantity is abnormally too high, the corresponding output current is increased, and the voltage drop at two ends of the collected sampling resistor is increased. When the voltage drop is increased to a set value, the network level of a DRV1 driving signal end can be quickly and effectively pulled down, the MOS transistor Q1 is turned off, and then the circuit is turned off, and an electric device connected with the rear end is protected.
Drawings
The accompanying drawings 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, do not constitute a limitation of the invention, in which:
fig. 1 shows a schematic block diagram of a linear constant current source circuit with current limiting protection according to an embodiment of the present invention;
fig. 2 shows a schematic circuit diagram of a linear constant current source circuit with current limiting protection according to an embodiment of the present invention;
fig. 3 shows a graph of output characteristics of the MOS transistor Q2 according to the embodiment of the present invention;
fig. 4 shows a circuit structure diagram of a linear constant current source circuit with current limiting protection according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-4, as an example, the linear constant current source circuit with current-limiting protection of this embodiment includes a MOS transistor Q1 configured to turn off when a voltage of a sampling resistor is greater than or equal to a preset threshold, a MOS transistor Q2 in a constant current linear amplification region, and a sampling module configured to sample a current of the sampling resistor, where a drain of the MOS transistor Q1 is connected to a voltage positive input terminal, a source of the MOS transistor Q1 is connected to a voltage positive output terminal and a power load positive terminal, a gate of the MOS transistor Q1 is connected to a DRV1 driving signal terminal, a drain of the MOS transistor Q2 is connected to a voltage negative output terminal and a power load negative terminal, a source of the MOS transistor Q2 is connected to one end of the sampling module and a current sampling CS terminal, a gate of the MOS transistor Q2 is connected to a DRV2 driving signal terminal, and another end of the sampling module is grounded.
The embodiment of the utility model provides a take current-limiting protection's linear constant current source circuit, if the voltage of outside given analog quantity takes place unusually when too high, the output current that corresponds also can increase thereupon, and the pressure drop at the sampling resistance both ends of gathering also risees thereupon. When the voltage drop is increased to a set value, the network level of a DRV1 driving signal end can be quickly and effectively pulled down, the MOS transistor Q1 is turned off, and then the circuit is turned off, and an electric device connected with the rear end is protected.
Specifically, the preset threshold corresponds to the set value, and the specific size may be set according to parameters of an electric device connected to the rear end. The utility model discloses a take current-limiting protection's linear constant current source circuit, MOS pipe Q1 regard as ON/OFF switch or play current-limiting protection's effect between positive voltage input end and the positive output end of voltage, and MOS pipe Q2 control is in the work of constant current linear amplification district to realize linear constant current source's electric current size and other controls.
The constant current linear amplification region (also called constant current region, saturation region, amplification region, active region) is located in the not yet broken down region between the right of the pre-pinch-off trace and the left of the breakdown region in fig. 3. In this region, when VGs (gate-to-source voltage) is constant, Ib (base current) hardly changes with VDs (drain-to-source voltage), and exhibits constant current characteristics. I is controlled by VGs only, and a current source controlled by voltage VGs is equivalent to a current source between D (drain) and S (source) of the MOS tube. When a MOS transistor is used for an amplifier circuit, the MOS transistor generally operates in this region.
Furthermore, the source and the gate of the MOS transistor Q1 are also connected through a resistor R1, and the source and the gate of the MOS transistor Q2 are also connected through a resistor R2.
Specifically, the resistor R is connected in parallel between the gate and the source of the MOS transistor, considering that the resistor between the source and the gate is large, and there is a certain capacitance between them (the diode is also called a PN junction capacitor, so the PN junction capacitor is considered in high frequency signals), after the resistor R is connected in parallel, when the signal is changed from large voltage to small voltage, the resistor R discharges between them, and when the signal is changed from small voltage to large voltage, the resistor R does not overlap with the voltage of the inter-electrode capacitor (because the electricity of the inter-electrode capacitor is already discharged through the resistor), and the signal voltage is not enough to break down the MOS transistor, thereby protecting the MOS transistor.
Further, the MOS transistor Q1 and the MOS transistor Q2 are both of the type IRFS4310Z MOS transistors.
Specifically, the MOS transistor of the IRFS4310Z type is an N-channel MOS transistor. The embodiment of the utility model provides an in linear constant current source circuit of taking current-limiting protection is applied to the laser industry chain, and the current size, pulse frequency and the duty cycle size of laser pump source load can be controlled to collocation laser power supply rear end. The working state of the linear constant current source circuit with the current-limiting protection can meet the actual working state requirement of a laser pump source, and the size, the frequency and the duty ratio of output current are controlled through the external given voltage, the pulse frequency and the duty ratio. For example, how many volts externally given corresponds to how many amperes of current output; the pulse frequency given by the outside corresponds to the pulse frequency stage of the output current; the externally given duty ratio corresponds to the duty ratio range within which the output current works.
Furthermore, the equivalent circuit of the power load is a plurality of diodes which are connected in series in sequence, and the sampling module comprises a sampling resistor.
In particular, since the laser pump source is internally composed of a plurality of light emitting diodes, the characteristics of the laser pump source substantially correspond to those of the diodes. The power of the laser pump source is large, and the energy of the emitted light is very strong. In order not to cause unnecessary harm to human body, the diode D1, the diode D2, the diode D3 and a plurality of diodes are connected in series to simulate the laser pump source, so as to carry out simulation experiments and test aging. The voltage drop of the serial superposition of the diodes is equivalent to the practical voltage of a laser pump source, the output voltage is controlled within 3V less than the input voltage, and the smaller the output and input voltage drops, the higher the efficiency. The anode of the diode after series connection is connected to the voltage positive output end, and the cathode of the diode after series connection is connected to the voltage negative output end. The sampling resistance is a resistance R3 of 5m ohms. To the utility model discloses a when the linear constant current source circuit of taking current-limiting protection carries out the simulation experiment, if the voltage of the analog quantity is given in the outside takes place unusually too high, the output current who corresponds also can increase thereupon, gathers the pressure drop at sampling resistance R3 both ends and also risees thereupon. When the network level of the DRV1 driving signal end is quickly and effectively pulled down and the MOS tube Q1 is turned off when the network level reaches a set value after sampling and amplification of an internal circuit, so that the effect of protecting a plurality of diodes which are sequentially connected in series is achieved.
Further, the diode is a MUR3040PT type diode.
Specifically, the MUR3040PT type diode is a fast recovery rectifier diode, a double-transistor common cathode (half bridge), a withstand voltage of 400V, and a current of 30A.
Further, the sampling module comprises a resistor R12, a resistor R17, a capacitor C17, a resistor R38, a capacitor C12, an OPA2376AID type operational amplifier U1B, a resistor R15, a resistor R16, a capacitor C22, a resistor R11, a resistor R8, a capacitor C6, a capacitor C9, a capacitor C4, an OPA2376AD type operational amplifier U1A, a resistor R5, a resistor R41, an MMBT4401 type triode Q6 and an MMBT4401 type triode Q5; one end of the resistor R12 is connected with a current sampling CS end, a first path at the other end of the resistor R12 is connected with one end of a resistor R38, a second path at the other end of the resistor R12 is connected with one end of a capacitor C12, a third path at the other end of the resistor R12 is connected with a positive input end of an operational amplifier U1B, a fourth path at the other end of the resistor R12 is connected with one end of a capacitor C17, the other end of the resistor R38 and the other end of the capacitor C12 are both grounded, a first path at a negative input end of the operational amplifier U1B is connected with the other end of a capacitor C17, a second path at a negative input end of the operational amplifier U1B is connected with one end of a resistor R17, a third path at a negative input end of the operational amplifier U1B is connected with one end of a capacitor C22, a fourth path at a negative input end of the operational amplifier U1B is connected with one end of a resistor R42, the other end of the, a first path of the output end of the operational amplifier U1B is connected to one end of a resistor R15, a second path of the output end of the operational amplifier U1B is connected to one end of a resistor R11, the other end of the resistor R16 is connected to the other end of the resistor R15, a first path of the other end of the resistor R11 is connected to one end of a capacitor C9, a second path of the other end of the resistor R11 is connected to one end of a resistor R8, a third path of the other end of the resistor R11 is connected to the negative input end of the operational amplifier U1A, the positive input end of the operational amplifier U1A is connected to the gate of the MOS transistor Q59638 and the D/a control signal input end, the positive voltage input electrode of the operational amplifier U1A is grounded, a first path of the negative voltage input electrode of the operational amplifier U1A is connected to the +6V input end, a second path of the negative voltage input electrode of the operational amplifier U1A is, the other end of the capacitor C4 is grounded, the first path of the output end of the operational amplifier U1A is connected with one end of the capacitor C6, the second path of the output end of the operational amplifier U1A is connected with the other end of the capacitor C9, the other end of the resistor R8 is connected with the other end of the capacitor C6, the third path of the output end of the operational amplifier U1A is connected with one end of the resistor R5, the first path of the other end of the resistor R5 is connected with the base electrode of the triode Q6, the second path of the other end of the resistor R5 is connected with the base electrode of the triode Q5, the collector electrode of the triode Q6 is connected with one end of the resistor R41, the other end of the resistor R41 is connected with a +6.5V input end, the collector of the triode Q5 is connected with a current sampling CS end, the emitter of the transistor Q5 and the emitter of the transistor Q6 are both connected to the gate of the MOS transistor Q2 through the DRV2 drive signal terminal.
Specifically, the parameters of the components of the sampling module may be as shown in fig. 4. The embodiment of the utility model provides a take current-limiting protection's linear constant current source circuit, R3 is output current's sampling resistor. The voltage at two ends of the resistor R12 and the resistor R17 differential sampling resistor R3 is amplified by the operational amplifier U1B and then is compared with the external given D/A control signal at the pin 2 of the operational amplifier U1A, so that the pin 1 of the operational amplifier U1A outputs energy to turn on the triode Q5 and the triode Q6, and the signal end is connected to the grid of the MOS tube Q2 through the DRV2 drive signal end, so that the MOS tube Q2 works in the constant current area of the constant current linear amplification area, and the purpose of linear constant current is achieved.
Specifically, the embodiment of the present invention provides a linear constant current source circuit with current limiting protection, which has an ON/OFF switch and an overcurrent protection function, wherein the network level of the DRV1 driving signal terminal is low level when OFF state and overcurrent protection, and the MOS transistor Q1 is turned OFF and does not conduct to output to play a role in back-end protection. And the D/A control signal of the linear constant current source circuit is given by the outside, and the output current, the frequency and the duty ratio can be controlled.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a take current-limiting protection's linear constant current source circuit, its characterized in that includes MOS pipe Q1 that is used for cutting off when the voltage of sampling resistance is greater than or equal to and predetermines the threshold value, MOS pipe Q2 that is in the constant current linear amplification district and the sampling module that is used for sampling the current of sampling resistance, MOS pipe Q1's drain electrode connection voltage positive input end, voltage positive output end and power load positive pole are connected respectively to MOS pipe Q1's source electrode, DRV1 drive signal end is connected to MOS pipe Q1's grid, voltage negative output end and power load negative pole are connected respectively to MOS pipe Q2's drain electrode, sampling module's one end and current sampling CS end are connected respectively to MOS pipe Q2's source electrode, DRV2 drive signal end is connected to MOS pipe Q2's grid, sampling module's the other end ground connection.
2. The linear constant current source circuit with current-limiting protection of claim 1, wherein the source and the gate of the MOS transistor Q1 are further connected through a resistor R1, and the source and the gate of the MOS transistor Q2 are further connected through a resistor R2.
3. The linear constant current source circuit with current-limiting protection of claim 1, wherein the MOS transistor Q1 and the MOS transistor Q2 are both of type IRFS4310Z MOS transistors.
4. The linear constant current source circuit with current-limiting protection of claim 1, wherein the equivalent circuit of the power load is a plurality of diodes connected in series in sequence, and the sampling module comprises a sampling resistor.
5. The linear constant current source circuit with current-limiting protection of claim 4, wherein the diode is a MUR3040PT type diode.
6. The linear constant current source circuit with the current-limiting protection function of claim 1, wherein the sampling module comprises a resistor R12, a resistor R17, a capacitor C17, a resistor R38, a capacitor C12, an OPA2376AID type operational amplifier U1B, a resistor R15, a resistor R16, a capacitor C22, a resistor R11, a resistor R8, a capacitor C6, a capacitor C9, a capacitor C4, an OPA2376AD type operational amplifier U1A, a resistor R5, a resistor R41, an MM440BT 1 type triode Q6 and an MMBT4401 type triode Q5; one end of the resistor R12 is connected with a current sampling CS end, a first path at the other end of the resistor R12 is connected with one end of a resistor R38, a second path at the other end of the resistor R12 is connected with one end of a capacitor C12, a third path at the other end of the resistor R12 is connected with a positive input end of an operational amplifier U1B, a fourth path at the other end of the resistor R12 is connected with one end of a capacitor C17, the other end of the resistor R38 and the other end of the capacitor C12 are both grounded, a first path at a negative input end of the operational amplifier U1B is connected with the other end of a capacitor C17, a second path at a negative input end of the operational amplifier U1B is connected with one end of a resistor R17, a third path at a negative input end of the operational amplifier U1B is connected with one end of a capacitor C22, a fourth path at a negative input end of the operational amplifier U1B is connected with one end of a resistor R42, the other end of the, a first path of the output end of the operational amplifier U1B is connected to one end of a resistor R15, a second path of the output end of the operational amplifier U1B is connected to one end of a resistor R11, the other end of the resistor R16 is connected to the other end of the resistor R15, a first path of the other end of the resistor R11 is connected to one end of a capacitor C9, a second path of the other end of the resistor R11 is connected to one end of a resistor R8, a third path of the other end of the resistor R11 is connected to the negative input end of the operational amplifier U1A, the positive input end of the operational amplifier U1A is connected to the gate of the MOS transistor Q59638 and the D/a control signal input end, the positive voltage input electrode of the operational amplifier U1A is grounded, a first path of the negative voltage input electrode of the operational amplifier U1A is connected to the +6V input end, a second path of the negative voltage input electrode of the operational amplifier U1A is, the other end of the capacitor C4 is grounded, the first path of the output end of the operational amplifier U1A is connected with one end of the capacitor C6, the second path of the output end of the operational amplifier U1A is connected with the other end of the capacitor C9, the other end of the resistor R8 is connected with the other end of the capacitor C6, the third path of the output end of the operational amplifier U1A is connected with one end of the resistor R5, the first path of the other end of the resistor R5 is connected with the base electrode of the triode Q6, the second path of the other end of the resistor R5 is connected with the base electrode of the triode Q5, the collector electrode of the triode Q6 is connected with one end of the resistor R41, the other end of the resistor R41 is connected with a +6.5V input end, the collector of the triode Q5 is connected with a current sampling CS end, the emitter of the transistor Q5 and the emitter of the transistor Q6 are both connected to the gate of the MOS transistor Q2 through the DRV2 drive signal terminal.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112701663A (en) * | 2020-12-25 | 2021-04-23 | 上海东软载波微电子有限公司 | Overcurrent detection and protection circuit for power MOS (metal oxide semiconductor) tube and power MOS tube assembly |
| CN114337317A (en) * | 2022-02-16 | 2022-04-12 | 苏州联讯仪器有限公司 | Source meter circuit adopting four-quadrant driving mode |
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2019
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112701663A (en) * | 2020-12-25 | 2021-04-23 | 上海东软载波微电子有限公司 | Overcurrent detection and protection circuit for power MOS (metal oxide semiconductor) tube and power MOS tube assembly |
| CN112701663B (en) * | 2020-12-25 | 2023-10-20 | 上海东软载波微电子有限公司 | Overcurrent detection and protection circuit for power MOS tube and power MOS tube assembly |
| CN114337317A (en) * | 2022-02-16 | 2022-04-12 | 苏州联讯仪器有限公司 | Source meter circuit adopting four-quadrant driving mode |
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Address after: 518125 West half floor, 601, 701 of Building 4, Fubilun Technology Factory, Tantou Community, Songgang Street, Bao'an District, Shenzhen City, Guangdong Province, China Patentee after: Shenzhen Lianming Power Supply Co.,Ltd. Country or region after: China Address before: 518125, 11th Floor, Building 1, No. 128 Shangnan East Road, Huangpu Community, Xinqiao Street, Bao'an District, Shenzhen City, Guangdong Province, China, and 9th Floor, Building 2 Patentee before: SHENZHEN LIANMING POWER Co.,Ltd. Country or region before: China |