CN114371645B - Control circuit and device - Google Patents
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- CN114371645B CN114371645B CN202111505269.1A CN202111505269A CN114371645B CN 114371645 B CN114371645 B CN 114371645B CN 202111505269 A CN202111505269 A CN 202111505269A CN 114371645 B CN114371645 B CN 114371645B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25257—Microcontroller
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Abstract
The invention discloses a control circuit and a device, wherein the circuit comprises: the input end of the power supply module is connected with the output end of the power supply module through a primary coil of the current transformer; the output end of the enabling control module is connected with the enabling end of the power supply module through the secondary coil of the current transformer; the enabling control module comprises a switch unit and an optical coupler unit, wherein the output end of the enabling control module is connected with the first end of the switch unit, the second end of the switch unit is connected with one end of the optical coupler unit, and the other end of the optical coupler unit is connected with the enabling end of the power supply module. According to the technical scheme, the current transformer is utilized to combine the current into the switching value of the enabling signal, and the functions of enabling and overcurrent detection are completed by using one signal wire, so that interface resources of the power supply module are saved.
Description
Technical Field
The invention belongs to the technical field of circuit control, and particularly relates to a control circuit and a control device.
Background
Any electronic device is not powered off, and the current power technology is very mature and comprises various functions, wherein overcurrent detection and enabling are two basic functions.
The over-current detection is one of common power failure detection functions, in order to ensure that the output current of a power supply is within a rated range and cannot exceed the standard so as to damage a post-stage load circuit, a power supply chip generally detects some electrical parameters in the circuit to calculate the output current, the common current detection mode is to detect the pressure difference at two ends of a resistor through a current sampling resistor, synthesize the resistance value of the resistor and further calculate the current, or detect the current according to a certain proportion through a current transformer, the influence of the sampling circuit on a main circuit is reduced, meanwhile, the loss of the sampling circuit is reduced, and when the current is detected to be too large, a power switch is turned off and power supply to the post-stage is not supplied.
The power supply is enabled to be one of basic functions of a power supply, a plurality of different modules are arranged in complex chips at present and respectively need different power supply voltages to supply power, the modules have strict time sequence requirements at the initial stage of power-on, if the power supply starts working once detecting input, the power supply can lead to the power-on time sequence error of the chip, so that the chip cannot work normally, the enabling function is added, the starting sequence of the chips of different power supplies is set according to the requirement of the power-on time sequence of the chip, and the power-on time sequence of the chip is ensured to be normal.
On some customized power modules, only a part of basic functions such as power supply enabling, output voltage fine tuning and the like are usually provided, and the functions are led out through pins of the power module, so that a user can conveniently adjust the power module according to own requirements. However, the current detection function is not opened to the user, so that on one hand, the power module space is limited, and all functions cannot be led out through pins; on the other hand, the size of the overcurrent point in the current detection function cannot be adjusted by a user, so that the power supply module meeting the requirement is selected according to the use requirement of the user when the power supply module is selected, and the application range of the power supply is greatly reduced.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, an object of the present invention is to provide a control circuit and a control device.
In order to solve the technical problems, the embodiment of the invention provides the following technical scheme:
a control circuit, comprising:
the input end of the power supply module is connected with the output end of the power supply module through a primary coil of the current transformer;
the output end of the enabling control module is connected with the enabling end of the power supply module through the secondary coil of the current transformer;
the enabling control module comprises a switch unit and an optical coupler unit, wherein the output end of an enabling signal PG is connected with the first end of the switch unit, the second end of the switch unit is connected with one end of the optical coupler unit, and the other end of the optical coupler unit is connected with the enabling end of the power supply module.
Optionally, the first end of the primary coil is connected with a first power supply;
the second end of the primary coil is connected with the input end of the power supply module.
Optionally, the enabling control module further includes:
a first resistor;
the second end of the first resistor is connected with the first end of the secondary coil;
and the output end of the enabling signal PG outputs an enabling signal, the enabling signal PG is from other power networks of equipment to which the control circuit belongs, and the enabling signal passes through the first resistor.
Optionally, the enabling control module further includes: a voltage stabilizing tube;
the cathode of the voltage stabilizing tube is respectively connected with the second end of the first resistor and the first end of the secondary coil;
the anode of the voltage stabilizing tube is grounded.
Optionally, the optocoupler unit includes a light emitting element and a light receiving element;
the input end of the light-emitting element is connected with a second power supply; the output end of the light-emitting element is connected with the second end of the switch unit;
the first end of the light receiving element is connected with the enabling end, and the second end of the light receiving element is grounded;
when the light emitting element is conducted, the light receiving element is irradiated by light, the light receiving element is conducted, and the power supply module is in a working state.
Optionally, the light emitting element is a light emitting diode;
the input end of the light emitting diode is connected with the second power supply; the output end of the light emitting diode is connected with the second end of the switch unit.
Optionally, the input end of the light emitting diode is connected with the first end of the third resistor, and the second end of the third resistor is connected with the second power supply.
Optionally, the light receiving element is a phototransistor;
the collector electrode of the phototriode is connected with the enabling end; the emitter of the phototriode is grounded.
Optionally, the enabling end of the power module is connected with the first end of the second resistor;
the second end of the second resistor is connected with a third power supply;
the first end of the second resistor is connected with the collector electrode of the phototriode.
The embodiment of the invention also provides a control device which comprises the control circuit.
The embodiment of the invention has the following technical effects:
according to the technical scheme, 1) current is detected through a current transformer, the detected current is corresponding to voltage through a linear relation (voltage=current-resistance), the voltage is superimposed on a voltage component of an enabling control module, and finally overcurrent detection is achieved by judging the magnitude of the superimposed quantity; therefore, the current transformer is utilized to combine the current into the switching value of the enabling signal, the function of enabling and overcurrent detection is completed by using one signal wire, a mode of adjusting an overcurrent point can be provided for a user, and meanwhile, the current detection and the enabling are completed through one interface pin, so that the power-on enabling can be completed, the overcurrent detection can be completed, and the interface resource of a power supply module is saved.
2) The current transformer and the optocoupler unit are isolation devices, namely the primary coil and the secondary coil, and the light-emitting element and the light-receiving element belong to different circuit networks, and are not electrically connected with each other; thus, complete isolation of the power supply module from the enable control module is achieved, and the enable signal may come from other power supply networks of the device.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of a control circuit according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
To facilitate an understanding of the embodiments by those skilled in the art, some terms are explained:
PG: POWER GOOD, enable signal.
Reference voltage source: the 3 pins are respectively a CATHODE (CATHODE, CAT for short), an ANODE (ANODE) and a reference terminal (REF).
As shown in fig. 1, an embodiment of the present invention provides a control circuit including:
the input end VIN pin of the power supply module is connected with the output end of the power supply module through the primary coil of the current transformer T1;
the output end of the enabling control module is connected with an enable end EN pin of the power supply module through a secondary coil of the current transformer T1;
the enabling control module comprises a switch unit and an optical coupler unit OP1, the output end of an enabling signal PG is connected with the first end of a secondary coil of the current transformer, the second end of the secondary coil is connected with the first end of the switch unit, the second end of the switch unit is connected with one end of the optical coupler unit OP1, and the other end of the optical coupler unit OP1 is connected with an enable end EN pin of the power supply module.
Specifically, the first power supply VCC1 is connected to the input terminal VIN pin of the power supply module through the primary coil connection of the current transformer T1, and is used for supplying power to the power supply module.
The third end of the switch unit is grounded.
The secondary coil and the primary coil of the current transformer T1 can be adjusted to change the resistance value, and then the size of the overcurrent point can be influenced.
According to the embodiment of the invention, the current is detected through the current transformer T1, the detected current is corresponding to the voltage through the linear relation (voltage=current-resistance), then the voltage is superimposed on the voltage component of the enabling control module, and finally the overcurrent detection is realized by judging the magnitude of the superimposed quantity; therefore, the current transformer T1 is utilized to combine the current into the switching value of the enabling signal PG, the function of enabling and overcurrent detection is completed by using one signal wire, a mode of adjusting an overcurrent point can be provided for a user, meanwhile, the current detection and the enabling are completed by one interface pin, the power-on enabling can be completed, the overcurrent detection can be completed, and the interface resource of a power supply module is saved.
In an alternative embodiment of the present invention, the first end of the primary coil is connected to a first power source VCC 1; the second end of the primary coil is connected with the input end VIN pin of the power supply module.
In the embodiment of the present invention, the first power VCC1 may be an externally supplied dc power supply, or an externally ac power supply converted dc power supply.
For example: the first power VCC1 may be 48V power generated by some dc power servers;
or when the outside is ac 220V power, the first power VCC1 may be a relatively low voltage converted from 220V, such as 48V, 60V.
In an alternative embodiment of the present invention, the enabling control module further includes:
a first resistor R1;
the second end of the first resistor R1 is connected with the first end of the secondary coil;
the output end of the enabling signal PG is connected with the first end of the first resistor;
the enabling signal PG passes through the first resistor R1 from other power networks of the device to which the control circuit belongs.
When the enabling signal PG is at high level, the control power supply module does not work, and when the enabling signal PG is at low level, the control power supply module works.
In the embodiment of the present invention, the first resistor R1 is used to ensure that the voltage regulator ZD1 does not pull the voltage of the enable signal PG low.
In an alternative embodiment of the present invention, the enabling control module further includes: a voltage stabilizing tube ZD1;
the cathode of the voltage stabilizing tube ZD1 is respectively connected with the second end of the first resistor R1 and the first end of the secondary coil;
the anode of the voltage stabilizing tube ZD1 is grounded.
In an optional embodiment of the present invention, the optocoupler unit OP1 includes a light emitting element and a light receiving element;
the input end of the light-emitting element is connected with a second power supply VCC 2; the output end of the light-emitting element is connected with the second end of the switch unit;
the first end of the light receiving element is connected with the enable end EN pin, and the second end of the light receiving element is grounded;
when the light emitting element is conducted, the light receiving element is irradiated by light, the light receiving element is conducted, and the power supply module is in a working state.
In the embodiment of the invention, the current transformer T1 and the optocoupler unit OP1 are isolation devices, namely the primary coil and the secondary coil and the light emitting element and the light receiving element belong to different circuit networks, and are not electrically connected with each other; thus, complete isolation of the power supply module from the enable control module is achieved, and the enable signal PG may come from other power supply networks of the device.
In an alternative embodiment of the present invention, the light emitting element is a light emitting diode;
the input end of the light emitting diode is connected with a second power supply VCC 2; the output end of the light emitting diode is connected with the second end of the switch unit.
In the embodiment of the invention, the light-emitting element can be any other element capable of realizing the function.
In an alternative embodiment of the present invention, the input terminal of the light emitting diode is connected to the first terminal of the third resistor R3, and the second terminal of the third resistor R3 is connected to the second power VCC 2.
In the embodiment of the invention, the second power VCC2 is used for ensuring the normal operation of the optocoupler OP1, and if the second power VCC2 is not provided, the light emitting diode of the optocoupler OP1 will not emit light.
In an optional embodiment of the present invention, the light receiving element is a phototransistor;
the collector electrode of the phototriode is connected with the enable end EN pin; the emitter of the phototriode is grounded.
In the embodiment of the invention, the light receiving element can be any other element capable of realizing the function.
In an alternative embodiment of the present invention, an enable terminal EN pin of the power module is connected to a first terminal of the second resistor R2;
the second end of the second resistor R2 is connected with a third power supply VCC 3;
the first end of the second resistor R2 is connected with the collector electrode of the phototriode.
In the embodiment of the invention, the third power VCC3 is used for ensuring that the enable terminal EN pin of the power module has a voltage, and if the third power VCC3 is not present, the voltage at the enable terminal EN pin of the power module is always 0.
In an alternative embodiment of the present invention, the switching unit may be a reference voltage source D1, a reference terminal of the reference voltage source D1 is connected to the second terminal of the secondary coil, a cathode of the reference voltage source D1 is connected to an output terminal of the light emitting diode, and an anode of the reference voltage source D1 is grounded.
The switch unit may be other components with switch function, and when the switch unit reaches a preset threshold, the switch unit is turned on, and when the switch unit is lower than the preset threshold, the switch unit is turned off.
The above embodiment of the present invention can be implemented based on the following working principle:
as shown in fig. 1, the output end of the enable control module outputs an enable signal PG, the enable signal PG is connected to the cathode pin of the voltage regulator ZD1 through a first resistor R1, and then is connected to the reference end REF of the reference voltage source D1 through the secondary coil of the current transformer T1, the cathode CAT pin of the reference voltage source D1 is connected to the output end of the light emitting diode, the input end of the light emitting diode is connected to the second power supply VCC2 through a third resistor R3, the collector of the phototransistor is pulled up to the third power supply VCC3 through the second resistor R2, and is connected to the enable end EN pin of the power supply module, and the emitter of the phototransistor is directly grounded;
the enable end EN pin of the power supply module can be set to be enabled at a low level, and is turned off at a high level; specific:
when the first power supply is not powered, the enable signal PG is at a low level, so the cathode pin of the voltage regulator ZD1 is also at a low level, the input voltage REF of the reference voltage source D1 is at a low level, the reference voltage source D1 is turned off, no current flows through the input end of the optocoupler unit OP1 (the input end of the light emitting diode), the light emitting diode in the optocoupler unit OP1 does not emit light, the phototransistor is turned off, and the power supply module is pulled up to the third power supply VCC3 through the second resistor R2 to be at a high level, and at this time, the power supply module does not work.
After the first power supply is powered normally, the enable signal PG is at a high level, so that the cathode pin of the voltage regulator ZD1 is also at a high level, the input voltage REF of the reference voltage source D1 is at a high level, the reference voltage source D1 is turned on, the current flows to the reference voltage source D1 through the second power supply VCC2, the light emitting diode emits light through the third resistor R3 and the light emitting diode in the optocoupler OP1, the phototransistor is turned on, the input terminal EN pin of the power supply module is pulled down (because the phototransistor is turned on, the voltages at the collector and the base of the phototransistor are very low and approach 0V, the emitter of the phototransistor is grounded, so that the voltage from the input terminal EN pin of the power supply module to the ground is also approach 0V, and therefore the EN pin is pulled down), and the power supply module starts to operate.
After the first power supply is powered normally, when the power supply module is also working normally, the enable signal PG must be at high level, and at this time, the cathode voltage of the voltage stabilizing tube ZD1 is V ZD1 The primary coil of the current transformer T1 has a current I T1_P The current of the secondary coil of the current transformer T1 is I T1_S The resistance of the secondary coil of the current transformer T1 is R T1 Then the voltage at the input voltage REF pin of the reference voltage source D1 is V D1 ＝V ZD1 -T T1_S *R T1 By selecting the current transformer T1 with proper turn ratio, ZD1 with proper voltage stabilizing value and the reference voltage source D1 with proper reference voltage value, when the power supply module is over-current, V D1 ＝V ZD1 -I T1_S *R T1 Reference voltage V smaller than reference voltage source D1 REF At this time, the reference voltage source D1 is turned off, the light emitting diode in the optocoupler unit OP1 does not emit light, the phototransistor cannot be turned on, the enable terminal EN pin of the power module is pulled up to the high level at the second power VCC2 through the second resistor R2, and the power module is turned off.
The embodiment of the invention also provides a control device which comprises the control circuit.
In addition, other structures and functions of the device according to the embodiments of the present invention are known to those skilled in the art, and are not described herein for redundancy reduction.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, for example, may be considered as a ordered listing of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (9)
1. A control circuit, comprising:
the input end of the power supply module is connected with the output end of the power supply module through a primary coil of the current transformer;
the enabling control module comprises a switch unit and an optocoupler unit, wherein the output end of an enabling signal PG is connected with the first end of a secondary coil of the current transformer, the second end of the secondary coil is connected with the first end of the switch unit, the second end of the switch unit is connected with one end of the optocoupler unit, and the other end of the optocoupler unit is connected with the enabling end of the power supply module;
the optocoupler unit comprises a light emitting element and a light receiving element;
the input end of the light-emitting element is connected with a second power supply; the output end of the light-emitting element is connected with the second end of the switch unit;
the first end of the light receiving element is connected with the enabling end, and the second end of the light receiving element is grounded;
when the light emitting element is conducted, the light receiving element is irradiated by light, the light receiving element is conducted, and the power supply module is in a working state.
2. The control circuit of claim 1, wherein the first end of the primary coil is connected to a first power source;
the second end of the primary coil is connected with the input end of the power supply module.
3. The control circuit of claim 1, wherein the enable control module further comprises:
a first resistor;
the second end of the first resistor is connected with the first end of the secondary coil, and the output end of the enabling signal PG is connected with the first end of the first resistor;
the enabling signal PG is from other power networks of the equipment to which the control circuit belongs, and the enabling signal PG passes through the first resistor.
4. The control circuit of claim 3, wherein the enable control module further comprises: a voltage stabilizing tube;
the cathode of the voltage stabilizing tube is respectively connected with the second end of the first resistor and the first end of the secondary coil;
the anode of the voltage stabilizing tube is grounded.
5. The control circuit of claim 1, wherein the light emitting element is a light emitting diode;
the input end of the light emitting diode is connected with the second power supply; the output end of the light emitting diode is connected with the second end of the switch unit.
6. The control circuit of claim 5, wherein the input terminal of the light emitting diode is connected to a first terminal of a third resistor, and a second terminal of the third resistor is connected to a second power supply.
7. The control circuit of claim 1, wherein the light receiving element is a phototransistor;
the collector electrode of the phototriode is connected with the enabling end; the emitter of the phototriode is grounded.
8. The control circuit of claim 7, wherein the enable terminal of the power module is connected to the first terminal of the second resistor;
the second end of the second resistor is connected with a third power supply;
the first end of the second resistor is connected with the collector electrode of the phototriode.
9. A control device comprising a control circuit as claimed in any one of claims 1 to 8.
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| CN202111505269.1A CN114371645B (en) | 2021-12-10 | 2021-12-10 | Control circuit and device |
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| CN202111505269.1A CN114371645B (en) | 2021-12-10 | 2021-12-10 | Control circuit and device |
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| CN114371645B true CN114371645B (en) | 2024-03-29 |
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| CN213367623U (en) * | 2020-11-17 | 2021-06-04 | 深圳市德富莱智能科技股份有限公司 | Test fixture and power supply system |
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| CN114371645A (en) | 2022-04-19 |
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