CN217935445U - Instantaneous current control circuit of power switch - Google Patents
Instantaneous current control circuit of power switch Download PDFInfo
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- CN217935445U CN217935445U CN202220973961.0U CN202220973961U CN217935445U CN 217935445 U CN217935445 U CN 217935445U CN 202220973961 U CN202220973961 U CN 202220973961U CN 217935445 U CN217935445 U CN 217935445U
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Abstract
The application provides a switch current control circuit in twinkling of an eye relates to electron technical field, and this switch current control circuit in twinkling of an eye includes: the circuit comprises a first filter capacitor module, a switch module and a second filter capacitor module; one end of the first filter capacitor module is connected with a power supply, the other end of the first filter capacitor module is connected with one end of the switch module, the other end of the switch module is connected with one end of the second filter capacitor module, and the other end of the second filter capacitor module is connected with a load; the capacitance value of the first filter capacitor module is greater than that of the second filter capacitor module, and the capacitance value of the first filter capacitor module is a preset multiple of that of the second filter capacitor module. The power switch instantaneous current control circuit can solve the problem that the power supply burden is large when the power switch is started.
Description
Technical Field
The embodiment of the application relates to the technical field of electronics, in particular to a power switch instantaneous current control circuit.
Background
In the field of electronic circuit technology, it is often necessary to design a switch for the voltage of a load, that is, the load operates when the switch is turned on, and stops operating when the power supply is turned off. In a general circuit, when a switch is opened, a filter capacitor of a load in the circuit has a large capacitance value, so that a large charging current appears in a process of charging the filter capacitor by a power supply, and the charging current is a large burden on the power supply.
In the prior art, the problem of large burden when the power supply starts a circuit is solved, the switch can be designed into a slow-start switch, when the switch is slowly opened, the current cannot rise too fast, but the slow-start switch is not suitable for a scene needing a fast switch; or the power supply capacity of the front stage is improved, but the cost is improved, so that the existing switch design schemes have technical defects and the problem of large load of a power supply starting circuit cannot be well solved.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a power switch instantaneous current control circuit, which can solve the problem that the power supply burden of a power supply is large when a circuit is started.
An embodiment of the present application provides a power switch transient current control circuit in one aspect, including:
the circuit comprises a first filter capacitor module, a switch module and a second filter capacitor module;
one end of the first filter capacitor module is connected with a power supply, the other end of the first filter capacitor module is connected with one end of the switch module, the other end of the switch module is connected with one end of the second filter capacitor module, and the other end of the second filter capacitor module is connected with a load;
the capacitance value of the first filter capacitor module is greater than that of the second filter capacitor module, and the capacitance value of the first filter capacitor module is a preset multiple of that of the second filter capacitor module.
Preferably, the first filter capacitor module comprises one or more first filter capacitors connected in parallel, the second filter capacitor module comprises one or more second filter capacitors connected in parallel, and the capacitance value of the first filter capacitor is at least 10 times that of the second filter capacitor.
Preferably, the control circuit further comprises: and the first switch control module is connected with the switch module and used for controlling the switch of the switch module.
Preferably, the control circuit further includes a second switch control module, and the second switch control module is respectively connected to the switch module and the first switch control module, and is configured to directly control or control the switch of the switch module through the first switch control module.
Preferably, the switch module comprises a PMOS transistor or a PNP transistor.
Preferably, the first switch control module includes an NMOS transistor or an NPN transistor.
Preferably, when the switch module includes a PMOS transistor and the first switch control module includes an NMOS transistor, a gate of the PMOS transistor is connected to a drain of the NMOS transistor, a source of the PMOS transistor is connected to the first filter capacitor, and a drain of the PMOS transistor is connected to the second filter capacitor.
Preferably, the second switch control module comprises a first resistor, a second resistor and a third resistor;
the one end of first resistance is connected the power with the source electrode of PMOS pipe, the other end of first resistance is connected the one end of second resistance with the grid of PMOS pipe, the other end of second resistance is connected the drain electrode of NMOS pipe, the third resistance is connected the grid of NMOS pipe, first resistance with the second resistance is used for through the adjustment the grid voltage control of PMOS pipe the switch of PMOS pipe, the third resistance is used for through the adjustment the grid voltage control of NMOS pipe the switch of PMOS pipe.
Known from above-mentioned each embodiment of this application, among the switch instantaneous current control circuit, when switch module opens, because the capacitance value of second filter capacitor module is less, switch module opens the instantaneous current and reduces greatly, and in addition because first filter capacitor module can be for second filter capacitor module charges, just so reduced this control circuit input power supply demand to the power greatly, the problem that the power burden is big when having solved the circuit and starting, and do not increase the hardware cost, be applicable to the scene including quick switch, application scope has been improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art are briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic block diagram of a power switch transient current control circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic block diagram of a power switch transient current control circuit according to another embodiment of the present disclosure;
fig. 3 is a schematic circuit diagram of a power switch transient current control circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic circuit diagram of a power switch transient current control circuit according to another embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.
Specifically, referring to fig. 1, a schematic block diagram of a power switch transient current control circuit according to an embodiment of the present disclosure is provided. As shown in fig. 1, the power switch transient current control circuit includes:
a first filter capacitor module 10, a switch module 20 and a second filter capacitor module 30;
one end of the first filter capacitor module 10 is connected to the power source 40, the other end is connected to one end of the switch module 20, the other end of the switch module 20 is connected to one end of the second filter capacitor module 30, and the other end of the second filter capacitor module 30 is connected to the load 50;
the first filter capacitor module 10 and the second filter capacitor module 30 are used for filtering, the capacitance of the first filter capacitor module 10 is greater than that of the second filter capacitor module 30, and the capacitance of the first filter capacitor module 10 is a predetermined multiple of the capacitance of the second filter capacitor module 30.
The first filter capacitor module 10 has a large capacitance value for filtering low-frequency ripples, and the second filter capacitor module 30 has a small capacitance value for filtering high-frequency noise.
In the control circuit, the first filter capacitor module 10 is closer to the power source 40 than the switch module 20, and the second filter capacitor module 30 is closer to the load 50 than the switch module 20.
The switch instantaneous current control circuit that this embodiment provided, when switch module opens, because the capacitance value of second filter capacitor module is less, switch module opens the instantaneous current and reduces greatly, and in addition because first filter capacitor module can charge for second filter capacitor module, just so reduced this control circuit input power supply demand to the power greatly, the big problem of power burden when having solved the circuit and starting, and do not increase the hardware cost, be applicable to the scene including fast switch, application scope has been improved.
Further, the first filter capacitor module 10 includes one or more first filter capacitors connected in parallel, and the second filter capacitor module 20 includes one or more second filter capacitors connected in parallel, where a capacitance value of the first filter capacitor is at least 10 times a capacitance value of the second filter capacitor. One or more of these may include one, two, three, and more.
For example, the capacitance of the second filter capacitor is 0.1uF (i.e., 100 nF) or even lower, and the capacitance of the first filter capacitor is 1uF or higher.
Referring to fig. 2, fig. 2 is a schematic diagram of a module structure of the power switching transient current control circuit in another embodiment, the power switching transient current control circuit further includes a first switch control module 60 and a second switch control module 70, the first switch control module 60 is connected to the switch module 20 for controlling the switching of the switch module 20; the second switch control module 70 is respectively connected to the switch module 20 and the first switch control module 60, and is configured to directly control or control the switch of the switch module 20 through the first switch control module 60.
Referring to fig. 3, fig. 3 is a schematic structural diagram of the first filter capacitor module 10 including a first filter capacitor C1, and the second filter capacitor module 30 including a second filter capacitor C2, where K1 is the switch module 20, rl is the load 50, vin is the voltage input terminal, and Vout is the voltage output terminal.
Referring to fig. 4, fig. 4 is a schematic structural diagram of the first filter capacitor module 10 including a plurality of first filter capacitors C1, and the second filter capacitor module 30 including a plurality of second filter capacitors C2.
The switch module 20 includes a PMOS (positive channel Metal Oxide Semiconductor) transistor or a PNP transistor or other components capable of implementing a switching function.
The first switch control module 60 includes an NMOS (N-Metal-Oxide-Semiconductor) transistor or an NPN transistor.
In fig. 4, for example that the switch module 20 includes a PMOS transistor Q1, the first switch control module includes an NMOS transistor Q2, a gate of the PMOS transistor Q1 is connected to a drain of the NMOS transistor Q2, a source of the PMOS transistor Q1 is connected to a first filter capacitor, and the first filter capacitor includes: c1, C2, C3, C4 and C5; the drain of the PMOS transistor Q1 is connected to a second filter capacitor, which includes C6 and C7, and the load 50 is U1.
In order to improve the filtering effect, the Q1 is as close to the positions of the second filter capacitor and the load as possible, and the distance between the first filter capacitor and the second filter capacitor and the Q1 is within the preset filtering distance. The closer the filtering distance is, the better the filtering effect is.
Specifically, the filtering distances of the first filtering capacitor and the second filtering capacitor can be set to be within a forty-one wavelength and much smaller than a quarter wavelength.
Further, the second switch control module 70 includes a first resistor R1, a second resistor R4, and a third resistor R3;
one end of a first resistor R1 is connected with a power supply VCC _ IN and a source electrode of a PMOS tube Q1, the other end of the first resistor R1 is connected with one end of a second resistor R4 and a grid electrode of the PMOS tube Q1, the other end of the second resistor R4 is connected with a drain electrode of an NMOS tube Q2, and the R1 and the R4 are used for controlling the switch of the Q1 by adjusting the grid electrode voltage of the Q1;
specifically, R1 and R4 can form a voltage division circuit after Q2 is conducted, so that when VCC _ IN voltage is higher, voltage of a PMOS tube Q1 is prevented from being too high and exceeding VGS voltage withstanding value of an MOS tube through voltage division, and Q1 is prevented from being damaged;
further, when Q1 is a PNP transistor, R4 functions to limit current.
In the circuit shown in fig. 4, Q1 may be replaced by a PNP transistor, Q2 may be replaced by an NPN transistor, and the connection relationships with the remaining components may be connected according to the prior art, which has the same circuit principle.
The third resistor R3 is connected with the grid electrode of the NMOS tube Q2 and is used for controlling the switch of the Q1 by adjusting the grid electrode voltage of the Q2. Specifically, control signal PWR _ CTL is sent to Q2 via resistors R2 and R3, with Q2 controlling the switching of Q1.
The operating principle of the circuit shown in fig. 4 is:
5 capacitors such as C1-C5 are first filter capacitors with relatively large capacitance values and are arranged between Q1 and a power supply VCC _ IN, and 2 capacitors such as C6-C7 are second filter capacitors with relatively small capacitance values and are arranged between Q1 and a load U1.
The PWR _ CTL signal controls the Q1 to be turned on or off through the Q2, and PWR _ CTL is an externally input control signal, and when the PWR _ CTL signal is at a high level, the Q2 is turned on, and after the turning on, the gate voltage of the Q1 is pulled down, thereby turning on the Q1 (i.e., turning on the switch Q1). When Q1 is conducted, C6 and C7 do not generate larger current due to smaller capacitance value, and simultaneously, when Q1 is conducted, C1-C5 and C6-C7 are conducted. C1-C5 have power supply of VCC _ IN before Q1 switches on, namely it is electrified, so after C6-C7 switch on, C1-C5 can supplement electric quantity to C6-C7 through Q1, reduce the current demand to the input, thus has lightened the burden to the power supply of the power.
R1 and R4 form a pull-up resistor, when PWR _ CTL is at a low level, Q2 is not conducted, and at the moment, a power supply VCC _ IN pulls up the grid voltage of Q1 to be the same as VCC through R1, so that Q1 is reliably ensured to be disconnected. When PWR _ CTL is high, Q2 turns on and pulls the Q1 gate low through R4, causing Q1 to turn on. If Q1 is selected as PNP transistor, R4 can be used as current limiting resistor of base stage input. R3 is a grid pull-down resistor of Q2, and when no control signal PWR _ CTL is input from the outside, R3 pulls the grid voltage of Q2 to a low level by default, so that the Q2 is prevented from being conducted by mistake.
R2 and R3 constitute a voltage dividing resistor, and when the externally input control signal PWR _ CTL is too high, Q2 can be prevented from being damaged by voltage division. If Q2 is selected to be an NPN transistor, R2 can be used as a current limiting resistor of the base input.
The capacitance values of the filter capacitors C1 to C7 are shown in fig. 4. The types of Q1 and Q2 are not particularly limited, and the setting of the resistance values of R1 to R3 is not particularly limited, as is known in the art, depending on the circuit design requirements in the above-described circuit. The non-disclosed details of the circuit shown in fig. 4, referred to in the art, should not be regarded as technical implementation obstacles.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The above is right the utility model provides a power switch current control circuit in twinkling of an eye's description, to the technical staff in the field, according to the utility model discloses the thought of embodiment all has the change part on concrete implementation and range of application, to sum up, this description content should not be understood as the restriction of the utility model.
Claims (8)
1. A power switch transient current control circuit, comprising:
the circuit comprises a first filter capacitor module, a switch module and a second filter capacitor module;
one end of the first filter capacitor module is connected with a power supply, the other end of the first filter capacitor module is connected with one end of the switch module, the other end of the switch module is connected with one end of the second filter capacitor module, and the other end of the second filter capacitor module is connected with a load;
the capacitance value of the first filter capacitor module is larger than that of the second filter capacitor module, and the capacitance value of the first filter capacitor module is a preset multiple of the capacitance value of the second filter capacitor module.
2. The control circuit of claim 1, wherein the first filter capacitor module comprises one or more first filter capacitors connected in parallel, and the second filter capacitor module comprises one or more second filter capacitors connected in parallel, and wherein the capacitance value of the first filter capacitor is at least 10 times the capacitance value of the second filter capacitor.
3. The control circuit of claim 2, further comprising: and the first switch control module is connected with the switch module and used for controlling the switch of the switch module.
4. The control circuit of claim 3, further comprising a second switch control module, connected to the switch module and the first switch control module, respectively, for controlling the switch of the switch module directly or through the first switch control module.
5. The control circuit of claim 4, wherein the switch module comprises a PMOS transistor or a PNP transistor.
6. The control circuit of claim 5, wherein the first switch control module comprises an NMOS transistor or an NPN transistor.
7. The control circuit of claim 6, wherein when the switch module comprises a PMOS transistor and the first switch control module comprises an NMOS transistor, a gate of the PMOS transistor is connected to a drain of the NMOS transistor, a source of the PMOS transistor is connected to the first filter capacitor, and a drain of the PMOS transistor is connected to the second filter capacitor.
8. The control circuit of claim 7, wherein the second switch control module comprises a first resistor, a second resistor, and a third resistor;
the one end of first resistance is connected the power with the source electrode of PMOS pipe, the other end of first resistance is connected the one end of second resistance with the grid of PMOS pipe, the other end of second resistance is connected the drain electrode of NMOS pipe, third resistance connection the grid of NMOS pipe, first resistance with the second resistance is used for through the adjustment the grid voltage control of PMOS pipe the switch of PMOS pipe, the third resistance is used for through the adjustment the grid voltage control of NMOS pipe the switch of PMOS pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220973961.0U CN217935445U (en) | 2022-04-25 | 2022-04-25 | Instantaneous current control circuit of power switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220973961.0U CN217935445U (en) | 2022-04-25 | 2022-04-25 | Instantaneous current control circuit of power switch |
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| Publication Number | Publication Date |
|---|---|
| CN217935445U true CN217935445U (en) | 2022-11-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220973961.0U Active CN217935445U (en) | 2022-04-25 | 2022-04-25 | Instantaneous current control circuit of power switch |
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| CN (1) | CN217935445U (en) |
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- 2022-04-25 CN CN202220973961.0U patent/CN217935445U/en active Active
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Address after: 518000, 13th Floor, Building A4, Nanshan Zhiyuan, No. 1001 Xueyuan Avenue, Changyuan Community, Taoyuan Street, Nanshan District, Shenzhen, Guangdong Province Patentee after: Shenzhen Pegasus Robotics Co.,Ltd. Country or region after: China Address before: 518000, 1st Floor, 16th Building, Zhiheng Industrial Park, Nantou Street, Nanshan District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN FEIMA ROBOTICS Co.,Ltd. Country or region before: China |
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