CN217037037U - Circuit for improving output characteristic of power module - Google Patents
Circuit for improving output characteristic of power module Download PDFInfo
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- CN217037037U CN217037037U CN202220795513.6U CN202220795513U CN217037037U CN 217037037 U CN217037037 U CN 217037037U CN 202220795513 U CN202220795513 U CN 202220795513U CN 217037037 U CN217037037 U CN 217037037U
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Abstract
The utility model discloses a circuit for improving the output characteristic of a power supply module, which comprises the power supply module, a voltage regulating circuit, an isolation feedback circuit, a feedback regulating circuit and a load, wherein the voltage regulating circuit is connected with the power supply module; one end of the power module and one end of the voltage regulating circuit of the power module are connected with the input voltage, and the other end of the power module and one end of the voltage regulating circuit of the power module are connected with one end of the isolation feedback circuit; the other end of the isolation feedback circuit is connected with one end of the feedback regulating circuit; the other end of the feedback regulating circuit is connected with a load; the load is also connected with the power module and the output end of the voltage regulating circuit. The feedback regulation circuit monitors the output voltage at the load and carries out feedback regulation; the isolation feedback circuit isolates and feeds back the output voltage regulating signal, and regulates the power module and the voltage regulating circuit of the voltage regulating circuit thereof to regulate the output voltage of the power module. Therefore, the power supply module can still keep stable output voltage under the conditions of factors such as output load, large change of ambient temperature and the like.
Description
Technical Field
The utility model relates to the technical field of electrical control, in particular to a circuit for improving the output characteristic of a power module.
Background
The power supply module changes along with conditions such as output load, ambient temperature and the like, the output voltage changes along with the conditions, and the change degrees of different power supply modules are different. In the prior art, the output characteristics of the power module are generally improved by measures of increasing the capacity of an output capacitor, increasing the wire diameter of an output cable, reducing the length of the output cable, reducing the temperature rise and the like.
In the technical measures, the capacity of the output capacitor is increased, only module output ripples can be improved, and the change of output voltage influenced by conditions such as output load or environment temperature cannot be reduced; the line diameter of the output cable is increased, the length of the output cable is reduced, only the change of the voltage drop on the output cable caused by the load change can be improved, and the change of the output voltage influenced by conditions such as output ripples, environmental temperature and the like cannot be improved; the temperature rise is reduced, and only the change of the output voltage caused by the temperature rise can be improved; the problem that the output voltage is changed due to the factors such as the change of the output load and the great change of the environmental temperature cannot be solved.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: the problem of power module because of output load, ambient temperature great change etc. cause output voltage to change is solved.
In order to solve the technical problems, the utility model provides the following technical scheme:
a circuit for improving the output characteristic of a power supply module comprises the power supply module, a voltage regulating circuit, an isolation feedback circuit, a feedback regulating circuit and a load;
one end of the power module and the voltage regulating circuit thereof is connected with the input voltage, and the other end of the power module and the voltage regulating circuit thereof is connected with one end of the isolation feedback circuit; the other end of the isolation feedback circuit is connected with one end of the feedback regulating circuit; the other end of the feedback regulating circuit is connected with a load;
and the load is also connected with the power module and the output end of the voltage regulating circuit.
The advantages are that: the feedback regulation circuit monitors the output voltage at the load and carries out feedback regulation; the isolation feedback circuit isolates and feeds back the output voltage regulating signal and regulates the power module and the voltage regulating circuit of the voltage regulating circuit to regulate the output voltage of the power module. Therefore, the power module can still keep stable output voltage under the conditions of output load, large change of ambient temperature and other factors.
Preferably, the power module and the voltage regulating circuit thereof comprise a power module U1, a resistor R1, and a resistor R2;
the power module U1 has an input port + VIN, an input port-VIN, an output port + VOUT, an output port-VOUT, and a voltage-regulating port Trim;
the power supply module U1 is connected with an input voltage through an input port plus VIN and an input port minus VIN;
the output port + VOUT and the output port-VOUT of the power supply module U1 are respectively connected to two ends of a load;
the resistor R1 is connected in series with the resistor R2, one end of the resistor R1 is connected to the output port +/-VOUT, and the other end of the resistor R1 is connected to the output port +/-VOUT;
and the voltage regulating port Trim is connected with the isolation feedback circuit through the common end of the resistor R1 and the resistor R2.
Preferably, the isolation feedback circuit comprises an optical coupler E1 and a resistor R3;
the optical coupler E1 comprises a primary diode and a secondary triode;
the anode of the primary diode is connected with one end of the feedback regulating circuit through a resistor R3, and the cathode of the primary diode is connected with the other end of the feedback regulating circuit;
the secondary transistor is connected in parallel with a resistor R1.
Preferably, the feedback regulation circuit comprises a resistor R4, a resistor R5 and an adjustable voltage reference V1;
one end of the resistor R4 and the resistor R5 are connected in series and then is connected with the terminal VOUT of the load, and the other end of the resistor R4 and the resistor R5 are connected with the terminal VOUT of the load;
the resistance R3 of the isolation feedback circuit is connected with the + VOUT end of the load;
and the cathode of the primary diode is connected with the-VOUT end of the load after passing through an adjustable voltage reference V1.
Preferably, the voltage regulator further comprises a capacitor C1, and the capacitor C1 is connected with the adjustable voltage reference V1 in parallel.
Preferably, the load is a resistor R6.
Compared with the prior art, the utility model has the beneficial effects that: the feedback regulation circuit monitors the output voltage at the load and carries out feedback regulation; the isolation feedback circuit isolates and feeds back the output voltage regulating signal and regulates the power module and the voltage regulating circuit of the voltage regulating circuit to regulate the output voltage of the power module. Therefore, the power supply module can still keep stable output voltage under the conditions of factors such as output load, large change of ambient temperature and the like. The output characteristic of the power supply module is improved, so that the terminal voltage of the electric equipment is more stable.
Drawings
FIG. 1 is a circuit diagram according to an embodiment of the present invention.
Detailed Description
In order to facilitate the understanding of the technical solutions of the present invention for those skilled in the art, the technical solutions of the present invention will be further described with reference to the drawings attached to the specification.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1, the present embodiment discloses a circuit for improving output characteristics of a power module, which includes a power module and a voltage regulating circuit 1, an isolation feedback circuit 2, a feedback regulating circuit 3, and a load 4.
The power module and the voltage regulating circuit 1 thereof comprise a power module U1, a resistor R1 and a resistor R2;
the power supply module U1 has an input port + VIN, an input port-VIN, an output port + VOUT, an output port-VOUT, and a voltage-regulating port Trim; the power supply module U1 is connected to the input voltage through the input port + VIN and the input port-VIN; the output port + VOUT and the output port-VOUT of the power supply module U1 are respectively connected to two ends of the load 4; the resistor R1 is connected in series with the resistor R2, one end of the resistor R1 is connected with the output port +/-VOUT, and the other end of the resistor R1 is connected with the output port +/-VOUT; the voltage regulating port Trim is connected with the isolation feedback circuit 2 through the common end of the resistor R1 and the resistor R2.
The isolation feedback circuit 2 comprises an optical coupler E1 and a resistor R3; the optical coupler E1 comprises a primary diode and a secondary triode; the anode of the primary diode is connected with one end of the feedback regulating circuit 3 through a resistor R3, and the cathode of the primary diode is connected with the other end of the feedback regulating circuit 3; the secondary transistor is connected in parallel with a resistor R1.
The feedback regulation circuit 3 comprises a resistor R4, a resistor R5 and an adjustable voltage reference V1.
After the resistor R4 and the resistor R5 are connected in series, one end of the resistor R4 is connected with the terminal VOUT of the load 4, and the other end of the resistor R5 is connected with the terminal VOUT of the load 4; the resistor R3 of the isolation feedback circuit 2 is connected to the + VOUT end of the load 4; the cathode of the primary diode is connected with the-VOUT end of the load 4 through an adjustable voltage reference V1.
The feedback regulation circuit 3 further comprises a capacitor C1; the capacitor C1 is connected in parallel with the adjustable voltage reference V1. The capacitor C1 can improve the regulation loop of the adjustable voltage reference V1 and ensure the stable operation of the adjustable voltage reference V1.
Meanwhile, the load 4 of the present embodiment is a resistor R6.
The power module U1 of the present embodiment can convert an input voltage into a stable input voltage, thereby ensuring the stability of the input voltage. Meanwhile, the power module U1 is connected with the load 4 and used for supplying power to the load 4 to realize the normal power supply function.
Meanwhile, in order to ensure that the circuit of the embodiment can better stably output in the environment with the factors such as the output load 4, the ambient temperature and the like, a voltage regulating port Trim is arranged on the power module U1 and is connected with a resistor R1 and a resistor R2 in the voltage regulating circuit, and then the regulating circuit regulates the power module through the voltage regulating port Trim according to signals transmitted by the isolation feedback circuit 2 and the feedback regulating circuit 3, so that the stable output state of the power module is ensured.
The isolation feedback circuit 2 is used for isolating and feeding back an output voltage regulation signal and regulating the voltage regulation circuit; the feedback adjusting circuit 3 is used for monitoring the output voltage to perform feedback adjustment; the feedback regulating circuit 3 monitors the voltage fluctuation condition at the load 4 and then feeds back to the regulating circuit through the isolation feedback circuit 2, thereby realizing the regulation of the power supply module U1.
The load 4 used in this embodiment is a resistor R6, which can be used as the load 4 in practical use.
When the circuit of the present embodiment is operating:
(1) when the input voltage of the power module U1 is within the normal range, the power module U1 starts the working output voltage VOUT, the resistors R1 and R2 divide the voltage VOUT, and the voltage regulation port Trim connected to the midpoint between the resistors R1 and R2 regulates the voltage of the power module output.
When the output voltage of the power supply module gradually rises from OV, the resistors R4 and R5 monitor the voltage reaching the load 4 in real time, and perform voltage division feedback, and the capacitor C1 improves the regulation loop thereof by comparing the adjustable voltage reference V1 with the internal reference thereof. When the voltage value of the divided voltage of the resistor R4 and the resistor R5 reaches the internal reference voltage of the adjustable voltage reference V1, the adjustable voltage reference V1 is conducted, the primary diode of the optocoupler E1 is started to pull down the current through the resistor R3 and the primary diode of the optocoupler E1, so that the primary diode of the optocoupler E1 emits light, after the secondary triode of the optocoupler E1 receives the primary light, the impedance of the secondary triode of the optocoupler E1 becomes small, the divided voltage of the resistor R1 and the resistor R2 is changed due to the fact that the secondary triode is connected with the resistor R1 in parallel, and the voltage of the voltage regulating port Trim of the power module U1 is changed accordingly. The final output voltage VOUT is stabilized at a voltage value set by a voltage dividing circuit composed of a resistor R4 and a resistor R5.
(2) When the internal temperature of the power module U1 rises due to heat generated during operation, the internal components of the power module U1 change parameters due to temperature changes, so that the output voltage changes along with the change of the coefficient of the voltage-regulating port Trim of the power module U1 corresponding to the output voltage VOUT.
At this moment, the feedback adjusting circuit 3 and the isolation feedback circuit 2 are arranged outside the power supply module, the influence of temperature rise of the power supply module U1 is small, the parameter change is relatively small, the feedback adjusting circuit 3 monitors the voltage change reaching the end of the load 4, the impedance of the secondary triode of the optocoupler E1 is automatically adjusted and changed through the isolation feedback circuit 2, so that the voltage division of the resistor R1 and the resistor R2 is changed, the coefficient change of the voltage regulating port Trim of the compensation power supply module U1 corresponding to the output voltage VOUT is compensated, and the output voltage is maintained at the set voltage.
(3) When the resistance value of the load 4 is reduced, the output current of the power supply module is increased, the voltage drop on the output anode cable and the output cathode cable is increased, and the voltage reaching the two ends of the load 4 is reduced.
At this time, the feedback adjusting circuit 3 monitors the voltage change reaching the two ends of the load 4, automatically adjusts and changes the impedance of the secondary triode of the optocoupler E1 through the isolation feedback circuit 2, further changes the voltage division of the resistor R1 and the resistor R2, and compensates the voltage drop of the output anode cable and the cathode cable, so that the voltage at the two ends of the load 4 is maintained at the set voltage.
In summary, the circuit of the embodiment realizes that the output characteristics of the power module can be kept in a stable state under different states. The change of the output voltage of the power supply module caused by the factors such as the output load 4, the ambient temperature and the like is solved, the output characteristic of the power supply module is improved, and the end voltage of the electric equipment is more stable.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The above-mentioned embodiments only represent the embodiments of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the concept of the present invention, and these embodiments are all within the protection scope of the present invention.
Claims (6)
1. A circuit for improving output characteristics of a power supply module, comprising: the power supply comprises a power supply module, a voltage regulating circuit (1) of the power supply module, an isolation feedback circuit (2), a feedback regulating circuit (3) and a load (4);
one end of the power module and the voltage regulating circuit (1) thereof is connected with the input voltage, and the other end of the power module is connected with one end of the isolation feedback circuit (2); the other end of the isolation feedback circuit (2) is connected with one end of the feedback regulating circuit (3); the other end of the feedback regulating circuit (3) is connected with a load (4);
and the load (4) is also connected with the power module and the output end of the voltage regulating circuit (1) thereof.
2. The circuit for improving output characteristics of a power supply module according to claim 1, wherein: the power module and the voltage regulating circuit (1) thereof comprise a power module U1, a resistor R1 and a resistor R2;
the power supply module U1 has an input port + VIN, an input port-VIN, an output port + VOUT, an output port-VOUT, and a voltage-regulating port Trim;
the power supply module U1 is connected with an input voltage through an input port plus VIN and an input port minus VIN;
the output port + VOUT and the output port-VOUT of the power supply module U1 are respectively connected to two ends of a load (4);
the resistor R1 is connected in series with the resistor R2, one end of the resistor R1 is connected with the output port +/-VOUT, and the other end of the resistor R1 is connected with the output port-VOUT;
and the voltage regulating port Trim is connected with the isolation feedback circuit (2) through the common end of the resistor R1 and the resistor R2.
3. The circuit for improving output characteristics of a power supply module according to claim 2, wherein: the isolation feedback circuit (2) comprises an optical coupler E1 and a resistor R3;
the optical coupler E1 comprises a primary diode and a secondary triode;
the anode of the primary diode is connected with one end of the feedback regulating circuit (3) through a resistor R3, and the cathode of the primary diode is connected with the other end of the feedback regulating circuit (3);
the secondary transistor is connected in parallel with a resistor R1.
4. The circuit for improving output characteristics of a power supply module according to claim 3, wherein: the feedback regulation circuit (3) comprises a resistor R4, a resistor R5 and an adjustable voltage reference V1;
after the resistor R4 and the resistor R5 are connected in series, one end of the resistor R4 is connected with the terminal VOUT of the load (4), and the other end of the resistor R5 is connected with the terminal VOUT of the load (4);
the resistor R3 of the isolation feedback circuit (2) is connected with the + VOUT end of the load (4);
the cathode of the primary diode is connected with the-VOUT end of the load (4) through an adjustable voltage reference V1.
5. The circuit for improving output characteristics of a power supply module according to claim 4, wherein: and the capacitor C1 is connected in parallel with the adjustable voltage reference V1 by the capacitor C1.
6. The circuit for improving output characteristics of a power supply module according to claim 1, wherein: the load (4) is a resistor R6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220795513.6U CN217037037U (en) | 2022-04-06 | 2022-04-06 | Circuit for improving output characteristic of power module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220795513.6U CN217037037U (en) | 2022-04-06 | 2022-04-06 | Circuit for improving output characteristic of power module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217037037U true CN217037037U (en) | 2022-07-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220795513.6U Active CN217037037U (en) | 2022-04-06 | 2022-04-06 | Circuit for improving output characteristic of power module |
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| Country | Link |
|---|---|
| CN (1) | CN217037037U (en) |
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- 2022-04-06 CN CN202220795513.6U patent/CN217037037U/en active Active
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