CN209994268U - Power supply with control mode priority function - Google Patents
Power supply with control mode priority function Download PDFInfo
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- CN209994268U CN209994268U CN201921287004.7U CN201921287004U CN209994268U CN 209994268 U CN209994268 U CN 209994268U CN 201921287004 U CN201921287004 U CN 201921287004U CN 209994268 U CN209994268 U CN 209994268U
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Abstract
The utility model discloses a power that possesses control mode priority function, on current switching power supply structure basis, the control unit and mode selection switch have been set up, the priority function of voltage control mode and current control mode has been increased for the power, when the power at low-voltage, under the underloading condition, can select voltage control mode, can select current control mode under the overload condition, can effectively solve the power on in the twinkling of an eye, output voltage, the problem of overshooting of electric current, protect load safety and stability's operation. The utility model discloses change on current power structure basis for a short time, simple structure easily realizes, and is with low costs.
Description
Technical Field
The utility model relates to a switching power supply technical field, concretely relates to power that possesses control mode priority function.
Background
A switching power supply is a high-frequency electric energy conversion device. Its function is to convert a level of voltage into the voltage or current required by the client. The power control mode refers to a method for stabilizing voltage output, and can be divided into a current mode and a voltage mode from a sampling amount. The traditional switching power supply does not have the function of voltage mode and current mode priority, so that when the power supply is powered on, voltage easily overshoots when the power supply is lightly loaded, and current easily overshoots when the power supply is heavily loaded, and the overshoots often damage a load.
Disclosure of Invention
In order to solve the power-on phenomenon that the overcharge phenomenon may be produced in the twinkling of an eye and cause the load to vibrate, the utility model provides a power.
The specific technical scheme is as follows:
a power supply with a control mode priority function comprises a voltage sampling circuit, a current sampling circuit, an error amplifier, a PWM generator and a power circuit, wherein the voltage sampling circuit and the current sampling circuit respectively sample voltage and current signals at the output end of the power circuit; the output end of the voltage sampling circuit is connected with one input end of the error amplifier, the other input end of the error amplifier inputs reference voltage, the output end of the error amplifier is connected with one input end of the PWM generator, and the output end of the PWM generator is connected with the control input end of the power circuit; the PWM closed-loop control circuit is characterized by further comprising a control unit and a mode selection switch, wherein the mode selection switch generates a mode selection signal, the control unit responds to the mode selection signal to output a carrier signal or a current sampling signal to the other input end of the PWM generator, and the carrier signal or the current sampling signal is compared with an output signal of the error amplifier to realize PWM closed-loop control.
The utility model discloses on current switching power supply structure basis, set up control unit and mode selection switch, for the power has increased the priority function of voltage control mode and current control mode, under the power is at low voltage, the underload condition, can select the voltage control mode, can select the current control mode under the overload condition, can effectively solve the power on in the twinkling of an eye, the problem of overshooting of output voltage, electric current, the operation of protection load safety and stability. The utility model discloses change on current power structure basis for a short time, simple structure easily realizes, and is with low costs, economical and practical.
Drawings
Fig. 1 is a schematic diagram of a power control mode.
Fig. 2 is a schematic diagram of a current control mode.
Detailed Description
The technical method of the present invention is further described in detail below with reference to the accompanying drawings:
as shown in fig. 1, the power supply in the voltage mode is a reference voltage and a fixed triangular wave for error amplification control PWM, a power stage of the power supply inputs a voltage VIN and outputs a voltage VOUT, a voltage sampling unit collects VOUT, the sampled VOUT and the reference voltage VREF perform error amplification to generate an error amplification signal VE, and the error signal VE and a triangular carrier are input to a PWM generator for generating a PWM control signal for controlling the output of the power stage. The voltage mode power supply has good response to the output voltage, and particularly, under the conditions of low voltage and light load, if the power supply is in the current mode, the slope of the current slope at the moment is too gentle, which is not beneficial to the stable control of PWM. By utilizing the advantage of the voltage mode, the voltage mode can be applied to the voltage mode priority mode for controlling and adjusting the loop, so that the overshoot problem of the output voltage at the moment of power-on of the power supply can be effectively solved, and the safe and stable operation of the load is protected.
As shown in fig. 2, the power supply in the current mode is a PWM generator that performs error amplification control on a reference voltage and a current sampling value, a power stage of the power supply inputs a voltage VIN and outputs a voltage VOUT, a voltage sampling unit collects VOUT, the sampled VOUT performs error amplification with the reference voltage VREF to generate an error amplification signal VE, and the error signal VE and a triangular carrier are input to the PWM generator to generate a PWM control signal for controlling the output of the power stage. The current mode power supply has good response to the load current, and particularly under the condition of heavy load, the current slope is steeper at the moment if the current mode is adopted, so that the PWM stable control is facilitated. By utilizing the advantage of the current mode, the control method can be applied to the current mode priority mode for control, and can effectively avoid load oscillation caused by instantaneous surge current output when the power supply is electrified.
The utility model discloses power structure can be according to the area condition of carrying, when the customer needs the voltage mode to be preferential, can set up the power into voltage control mode, when the customer needs the current mode to be preferential, can set up the power into current control mode.
The utility model discloses a power with voltage mode and current mode priority function includes voltage sampling circuit, current sampling circuit, error amplifier, PWM generator and power circuit. The input ends of the voltage sampling circuit and the current sampling circuit are connected with the output end of the power circuit, the output end of the voltage sampling circuit is connected with one input end of the error amplifier, the other input end of the error amplifier inputs reference voltage, the output end of the error amplifier is connected with one input end of the PWM generator, the other input end of the PWM generator can alternatively input carrier signals or current sampling signals, and the output end of the PWM generator is connected with the control input end of the power circuit. The carrier signal may be a triangular wave or other ramp signal.
On the basis of the traditional power structure, the utility model discloses increase a control unit and a mode selection switch, realize carrier signal or current sampling signal's an input PWM generator. The mode selection switch is operated by a user to select a power control mode (power mode or voltage mode) and generate a mode selection signal, wherein the mode selection signal is a voltage mode signal or a current mode signal. The control unit responds to the mode selection signal output by the mode selection switch to output a carrier signal or a current sampling signal to the other input end of the PWM generator, and the carrier signal or the current sampling signal is compared with the output signal of the error amplifier to realize PWM closed-loop control. When the mode selection signal is a voltage mode signal, the control unit outputs a triangular carrier signal to the other input end of the PWM generator; when the mode selection signal is a current mode signal, the control unit outputs a current sampling signal to the other input end of the PWM generator. The mode selection switch can be realized by adopting a digital or analog switch, the control unit can be directly realized by a processing unit of a power supply system, and other circuit modules belong to the prior art.
Claims (3)
1. A power supply with a control mode priority function comprises a voltage sampling circuit, a current sampling circuit, an error amplifier, a PWM generator and a power circuit, wherein the voltage sampling circuit and the current sampling circuit respectively sample voltage and current signals at the output end of the power circuit; the output end of the voltage sampling circuit is connected with one input end of the error amplifier, the other input end of the error amplifier inputs reference voltage, the output end of the error amplifier is connected with one input end of the PWM generator, and the output end of the PWM generator is connected with the control input end of the power circuit; the PWM closed-loop control circuit is characterized by further comprising a control unit and a mode selection switch, wherein the mode selection switch generates a mode selection signal, the control unit responds to the mode selection signal to output a carrier signal or a current sampling signal to the other input end of the PWM generator, and the carrier signal or the current sampling signal is compared with an output signal of the error amplifier to realize PWM closed-loop control.
2. The power supply of claim 1, wherein the mode selection switch is operable by a user to select a power control mode to generate the mode selection signal.
3. The power supply of claim 2, wherein:
when a user selects a voltage mode, the control unit responds to a voltage mode signal and outputs a triangular carrier signal to the other input end of the PWM generator;
when the user selects the current mode, the control unit outputs a current sampling signal to the other input terminal of the PWM generator in response to the current mode signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921287004.7U CN209994268U (en) | 2019-08-09 | 2019-08-09 | Power supply with control mode priority function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921287004.7U CN209994268U (en) | 2019-08-09 | 2019-08-09 | Power supply with control mode priority function |
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| Publication Number | Publication Date |
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| CN209994268U true CN209994268U (en) | 2020-01-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921287004.7U Active CN209994268U (en) | 2019-08-09 | 2019-08-09 | Power supply with control mode priority function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110336454A (en) * | 2019-08-09 | 2019-10-15 | 博士德科技(江苏)有限公司 | A kind of control method having control model priority facility and power supply |
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2019
- 2019-08-09 CN CN201921287004.7U patent/CN209994268U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110336454A (en) * | 2019-08-09 | 2019-10-15 | 博士德科技(江苏)有限公司 | A kind of control method having control model priority facility and power supply |
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