Output voltage regulating system of direct-current high-frequency switching power supply

Abstract

The utility model discloses a DC high frequency switch power supply output voltage adjusting system, comprising a main control board and a display panel connected with the main control board, the main control board comprises a first one-chip microcomputer system and a first communication circuit module, the output end of the first one-chip microcomputer system is connected with an output reference control circuit module, and the output reference control circuit module is connected with a second communication circuit module. The output end of the output reference control circuit module is connected with a PID control circuit module, and the output end of the PID control circuit module is connected with an output voltage feedback module and a switching device used for outputting actual direct-current voltage. The display panel comprises a second single-chip microcomputer system and a second communication circuit module, the input end of the second single-chip microcomputer system is connected with a key circuit module, and the output end of the second single-chip microcomputer system is connected with a nixie tube display module. According to the utility model, output voltage regulation is realized through a digital key method, an analog potentiometer regulation method is changed, and the circuit has the advantages of high regulation precision, stability, reliability, low possibility of output voltage drift, good use effect and convenience in popularization and use.

Description

Technical Field

[0001] The utility model belongs to the technical field of power electronics, and particularly relates to a DC high-frequency switching power supply output voltage regulation system. Background Technique

[0002] The traditional principle for regulating the output voltage of a DC high-frequency switching power supply is to set an adjustable potentiometer on the product panel. By rotating the potentiometer, the resistance value of the potentiometer in the circuit is changed, the power supply output voltage setting reference is adjusted, and then the output voltage value is changed. This method is easy to start with, simple and intuitive to operate, and is widely used in the prior art. However, the disadvantages of this mechanical operation method are also obvious. That is, when the accuracy requirement of the output voltage is very high, during the long-term operation of the power supply, sometimes due to reasons such as the mechanical structure of the potentiometer itself and the product quality, the resistance of the potentiometer will change slightly, resulting in a slight change in the output voltage. Over time, the power supply output voltage will drift, which has a greater impact on the use of the subsequent equipment. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a DC high-frequency switching power supply output voltage regulation system aiming at the deficiencies in the above-mentioned prior art. The system has a simple structure, reasonable design, and convenient implementation. The output voltage is regulated by a digital key method, changing the analog potentiometer regulation method, with high regulation accuracy, stable and reliable, not prone to output voltage drift, good use effect, and convenient for popularization and use.

[0004] To solve the above technical problem, the technical solution adopted by the utility model is: a DC high-frequency switching power supply output voltage regulation system, including a main control board and a display panel connected to the main control board. The main control board includes a first single-chip microcomputer system and a first communication circuit module connected to the first single-chip microcomputer system. The output end of the first single-chip microcomputer system is connected to an output reference control circuit module. The output end of the output reference control circuit module is connected to a PID control circuit module. The output end of the PID control circuit module is connected to an output voltage feedback module and a switching device for outputting the actual DC voltage. The output voltage feedback module is connected to the input end of the first single-chip microcomputer system. The display panel includes a second single-chip microcomputer system and a second communication circuit module connected to the first single-chip microcomputer system. The second communication circuit module communicates with the first communication circuit module. The input end of the second single-chip microcomputer system is connected to a key circuit module. The output end of the second single-chip microcomputer system is connected to a digital tube display module.

[0005] In the above-mentioned DC high-frequency switching power supply output voltage regulation system, the main control board and the display panel communicate through RS485.

[0006] The above-mentioned output voltage regulation system of a DC high-frequency switching power supply, the input end of the output reference control circuit module is connected with a default reference regulation circuit module.

[0007] The above-mentioned output voltage regulation system of a DC high-frequency switching power supply, both the first single-chip microcomputer system and the second single-chip microcomputer system include a single-chip microcomputer, a reset circuit, a crystal oscillator circuit and a power supply circuit.

[0008] The above-mentioned output voltage regulation system of a DC high-frequency switching power supply, the output reference control circuit module includes a triode Q1, a fast recovery diode D1, an inductor L1, a resistor R1, a resistor R2, a non-polar capacitor C1 and a non-polar capacitor C2. The base of the triode Q1 is connected to the output pin VREF_PWM of the first single-chip microcomputer system through the resistor R1 and is connected to one end of the resistor R2. The emitter of the triode Q1 and the other end of the resistor R2 are both connected to +12V_DC. The collector of the triode Q1 and the common cathode of the fast recovery diode D1 are both connected to one end of the inductor L1. The other end of the inductor L1 is the signal output end VREF_DC2 of the output reference control circuit module and is connected to one end of the non-polar capacitor C1 and one end of the non-polar capacitor C2. The double anodes of the fast recovery diode D1, the other end of the non-polar capacitor C1 and the other end of the non-polar capacitor C2 are all grounded.

[0009] The above-mentioned output voltage regulation system of a DC high-frequency switching power supply, the PID control circuit module includes an operational amplifier U17A, a bidirectional zener diode D23, a fast recovery diode D24, a resistor R225, a resistor R226, a resistor R227, a resistor R228, a resistor R229, a non-polar capacitor C109, a non-polar capacitor C110, a non-polar capacitor C111 and a non-polar capacitor C112. One end of the resistor R227 is connected to the signal output terminal VREF_DC2 of the output reference control circuit module. One end of the resistor R226 is connected to the reference voltage VREF_DC1. One end of the resistor R225 is connected to V_ADJR. One end of the non-polar capacitor C109 and the anode of the bidirectional zener diode D23 are both grounded. The other end of the resistor R227, the other end of the resistor R226, the other end of the resistor R225 and the other end of the non-polar capacitor C109 are all connected to the 3rd pin of the operational amplifier U17A. The cathode of the bidirectional zener diode D23 is connected to +12V_DC. The middle terminal of the bidirectional zener diode D23 and one end of the resistor R228 are both connected to DC_VFB. The other end of the resistor R228, one end of the non-polar capacitor C110 and one end of the resistor R229 are all connected to the 2nd pin of the operational amplifier U17A. The other end of the resistor R229 is connected to one end of the non-polar capacitor C111. The 1st pin of the operational amplifier U17A, the other end of the non-polar capacitor C110 and the other end of the non-polar capacitor C111 are all connected to the cathode of the fast recovery diode D24. The 4th pin of the operational amplifier U17A is grounded and is connected to the 8th pin of the operational amplifier U17A through a non-polar capacitor C112. The 8th pin of the operational amplifier U17A is connected to +12V_DC. The common anode of the fast recovery diode D24 is the signal output terminal DC_VO_CTR of the PID control circuit module.

[0010] The above-mentioned output voltage regulation system of a DC high-frequency switching power supply, the key circuit module includes key S1, key S2, resistor R13, resistor R14, resistor R15, resistor R16, non-polar capacitor C12 and non-polar capacitor C13. One end of the first pin, the second pin of key S1 and one end of resistor R13 are all connected to one end of resistor R15. The other end of resistor R13 is the first signal output terminal KEY1 of the key circuit module, and is grounded through non-polar capacitor C12. The other end of resistor R15 is connected to +5V. One end of the first pin, the second pin of key S2 and one end of resistor R14 are all connected to one end of resistor R16. The other end of resistor R14 is the second signal output terminal KEY0 of the key circuit module, and is grounded through non-polar capacitor C13. The other end of resistor R16 is connected to +5V. The third pin and the fourth pin of key S1 and the third pin and the fourth pin of key S2 are all grounded.

[0011] Compared with the prior art, the present invention has the following advantages: The system structure of the present invention is simple, the design is reasonable, and it is easy to implement. The output voltage is regulated by the digital key method, changing the analog potentiometer regulation method, with high regulation accuracy, stable and reliable, not easy to have output voltage drift, good use effect, and convenient for popularization and use.

[0012] Next, through the drawings and embodiments, the technical solutions of the present invention will be further described in detail. Description of the Drawings

[0013] Figure 1 It is the system block diagram of the present invention;

[0014] Figure 2 It is the circuit schematic diagram of the output reference control circuit module of the present invention;

[0015] Figure 3 It is the circuit schematic diagram of the PID control circuit module of the present invention;

[0016] Figure 4 It is the circuit schematic diagram of the key circuit module of the present invention.

[0017] Description of the Reference Signs:

[0018] 1 - Main control board; 1-1 - First single-chip microcomputer system;

[0019] 1-2 - First communication circuit module; 1-3 - Output reference control circuit module;

[0020] 1-4 - PID control circuit module; 1-5 - Output voltage feedback module;

[0021] 1-6 - Switch device; 1-7 - Default reference adjustment circuit module;

[0022] 2 - Display panel; 2-1 - Second single-chip microcomputer system;

[0023] 2-2 - Second communication circuit module; 2-3 - Button circuit module;

[0024] 2-4 - Digital tube display module. Detailed implementation mode

[0025] As Figure 1 shown, the output voltage regulation system of the DC high-frequency switching power supply of the present utility model includes a main control board 1 and a display panel 2 connected to the main control board 1. The main control board 1 includes a first single-chip microcomputer system 1-1 and a first communication circuit module 1-2 connected to the first single-chip microcomputer system 1-1. The output end of the first single-chip microcomputer system 1-1 is connected with an output reference control circuit module 1-3. The output end of the output reference control circuit module 1-3 is connected with a PID control circuit module 1-4. The output end of the PID control circuit module 1-4 is connected with an output voltage feedback module 1-5 and a switch device 1-6 for outputting the actual DC voltage. The output voltage feedback module 1-5 is connected to the input end of the first single-chip microcomputer system 1-1; the display panel 2 includes a second single-chip microcomputer system 2-1 and a second communication circuit module 2-2 connected to the first single-chip microcomputer system 2-1. The second communication circuit module 2-2 communicates with the first communication circuit module 1-2. The input end of the second single-chip microcomputer system 2-1 is connected with a button circuit module 2-3. The output end of the second single-chip microcomputer system 2-1 is connected with a digital tube display module 2-4.

[0026] In this embodiment, the main control board 1 and the display panel 2 communicate through RS485.

[0027] In this embodiment, the input end of the output reference control circuit module 1-3 is connected with a default reference adjustment circuit module 1-7.

[0028] In this embodiment, both the first single-chip microcomputer system 1-1 and the second single-chip microcomputer system 2-1 include a single-chip microcomputer, a reset circuit, a crystal oscillator circuit and a power supply circuit.

[0029] In this embodiment, as Figure 2As shown in the figure, the output reference control circuit module 1-3 includes a triode Q1, a fast recovery diode D1, an inductor L1, a resistor R1, a resistor R2, a non-polar capacitor C1 and a non-polar capacitor C2. The base of the triode Q1 is connected to the output pin VREF_PWM of the first single-chip microcomputer system 1-1 through the resistor R1 and is also connected to one end of the resistor R2. The emitter of the triode Q1 and the other end of the resistor R2 are both connected to +12V_DC. The collector of the triode Q1 and the common cathode of the fast recovery diode D1 are both connected to one end of the inductor L1. The other end of the inductor L1 is the signal output terminal VREF_DC2 of the output reference control circuit module 1-3 and is also connected to one end of the non-polar capacitor C1 and one end of the non-polar capacitor C2. The double anode of the fast recovery diode D1, the other end of the non-polar capacitor C1 and the other end of the non-polar capacitor C2 are all grounded.

[0030] In this embodiment, as Figure 3 shown, the PID control circuit module 1-4 includes an operational amplifier U17A, a bidirectional zener diode D23, a fast recovery diode D24, a resistor R225, a resistor R226, a resistor R227, a resistor R228, a resistor R229, a non-polar capacitor C109, a non-polar capacitor C110, a non-polar capacitor C111 and a non-polar capacitor C112. One end of the resistor R227 is connected to the signal output terminal VREF_DC2 of the output reference control circuit module 1-3. One end of the resistor R226 is connected to the reference voltage VREF_DC1. One end of the resistor R225 is connected to V_ADJR. One end of the non-polar capacitor C109 and the anode of the bidirectional zener diode D23 are both grounded. The other end of the resistor R227, the other end of the resistor R226, the other end of the resistor R225 and the other end of the non-polar capacitor C109 are all connected to the 3rd pin of the operational amplifier U17A. The cathode of the bidirectional zener diode D23 is connected to +12V_DC. The middle terminal of the bidirectional zener diode D23 and one end of the resistor R228 are both connected to DC_VFB. The other end of the resistor R228, one end of the non-polar capacitor C110 and one end of the resistor R229 are all connected to the 2nd pin of the operational amplifier U17A. The other end of the resistor R229 is connected to one end of the non-polar capacitor C111. The 1st pin of the operational amplifier U17A, the other end of the non-polar capacitor C110 and the other end of the non-polar capacitor C111 are all connected to the double cathode of the fast recovery diode D24. The 4th pin of the operational amplifier U17A is grounded and is connected to the 8th pin of the operational amplifier U17A through the non-polar capacitor C112. The 8th pin of the operational amplifier U17A is connected to +12V_DC. The common anode of the fast recovery diode D24 is the signal output terminal DC_VO_CTR of the PID control circuit module 1-4.

[0031] In this embodiment, as Figure 4 shown, the key circuit module 2-3 includes a key S1, a key S2, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a non-polar capacitor C12 and a non-polar capacitor C13. One end of the first pin, the second pin of the key S1 and one end of the resistor R13 are all connected to one end of the resistor R15. The other end of the resistor R13 is the first signal output terminal KEY1 of the key circuit module 2-3 and is grounded through the non-polar capacitor C12. The other end of the resistor R15 is connected to +5V. One end of the first pin, the second pin of the key S2 and one end of the resistor R14 are all connected to one end of the resistor R16. The other end of the resistor R14 is the second signal output terminal KEY0 of the key circuit module 2-3 and is grounded through the non-polar capacitor C13. The other end of the resistor R16 is connected to +5V. The third pin and the fourth pin of the key S1 and the third pin and the fourth pin of the key S2 are all grounded.

[0032] The working process of the present utility model is as follows: During the normal operation of the power supply, the display panel displays data such as the currently output voltage, current, temperature and alarm information. At this time, press the "Settings" key on the left side of the panel, and the digital tube on the display panel shows the current voltage setting value and is in a flashing state, indicating that the setting environment has been entered at this time. Press the "Query Key" on the right side of the panel to adjust the set voltage. The adjustment step is 0.1V to 1V, and the step value will be adjusted accordingly according to the output voltage level. Adjusting too many voltage values is transmitted to the main control board single-chip microcomputer through communication. The main control board single-chip microcomputer will perform actual output reference setting according to this set voltage value. The setting method is to use a Buck circuit on the main control board for real-time closed-loop control to ensure that the actual output voltage reference value is consistent with the set value.

[0033] The above is only a preferred embodiment of the present utility model, and does not impose any limitations on the present utility model. Any simple modification, change and equivalent structural change made to the above embodiments according to the technical essence of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A DC high-frequency switching power supply output voltage regulation system, characterized in that: The invention comprises a main control board (1) and a display panel (2) connected to the main control board (1), wherein the main control board (1) comprises a first single-chip computer system (1-1) and a first communication circuit module (1-2) connected to the first single-chip computer system (1-1), an output end of the first single-chip computer system (1-1) is connected to an output reference control circuit module (1-3), an output end of the output reference control circuit module (1-3) is connected to a PID control circuit module (1-4), and an output end of the PID control circuit module (1-4) is connected to an output voltage feedback module (1-5) and a circuit for outputting an actual DC current. The invention relates to a switching device (1-6) for adjusting a voltage, the output voltage feedback module (1-5) being connected to the input end of the first single-chip computer system (1-1); the display panel (2) comprising a second single-chip computer system (2-1) and a second communication circuit module (2-2) connected to the second single-chip computer system (2-1), the second communication circuit module (2-2) communicating with the first communication circuit module (1-2), the input end of the second single-chip computer system (2-1) being connected to a key circuit module (2-3), and the output end of the second single-chip computer system (2-1) being connected to a digital tube display module (2-4).

2. A DC high frequency switching power supply output voltage regulation system according to claim 1, characterized in that: The main control panel (1) and the display panel (2) communicate via RS485.

3. A DC high frequency switching power supply output voltage regulation system according to claim 1, characterized in that: The input end of the output reference control circuit module (1-3) is connected to a default reference adjustment circuit module (1-7).

4. A DC high frequency switching power supply output voltage regulation system according to claim 1, characterized in that: The first single-chip computer system (1-1) and the second single-chip computer system (2-1) both comprise a single-chip computer, a reset circuit, a crystal oscillator circuit and a power supply circuit.

5. A DC high frequency switching power supply output voltage regulation system according to claim 1, characterized in that: The output reference control circuit module (1-3) comprises a transistor Q1, a fast recovery diode D1, an inductor L1, a resistor R1, a resistor R2, a non-polar capacitor C1 and a non-polar capacitor C2. The base of the transistor Q1 is connected to the output pin VREF_PWM of the first single-chip computer system (1-1) through the resistor R1, and is connected to one end of the resistor R2. The emitter of the transistor Q1 and the other end of the resistor R2 are both connected to +12V_DC. The collector of the transistor Q1 and the common cathode of the fast recovery diode D1 are both connected to one end of the inductor L1. The other end of the inductor L1 is the signal output terminal VREF_DC2 of the output reference control circuit module (1-3), and is connected to one end of the non-polar capacitor C1 and one end of the non-polar capacitor C2. The dual anodes of the fast recovery diode D1, the other end of the non-polar capacitor C1 and the other end of the non-polar capacitor C2 are all grounded.

6. A DC high frequency switching power supply output voltage regulation system according to claim 5, characterized in that: The PID control circuit module (1-4) comprises an operational amplifier U17A, a bidirectional voltage regulator diode D23, a fast recovery diode D24, a resistor R225, a resistor R226, a resistor R227, a resistor R228, a resistor R229, a non-polar capacitor C109, a non-polar capacitor C110, a non-polar capacitor C111 and a non-polar capacitor C112, one end of the resistor R227 is connected to a signal output end VREF_DC2 of the output reference control circuit module (1-3), one end of the resistor R226 is connected to a reference voltage VREF_DC1, one end of the resistor R225 is connected to V_ADJR, one end of the non-polar capacitor C109 and an anode of the bidirectional voltage regulator diode D23 are both grounded, the other end of the resistor R227, the other end of the resistor R226, the other end of the resistor R225 and the other end of the non-polar capacitor C109 are all connected to the third pin of the operational amplifier U17A, and the bidirectional voltage regulator diode The cathode of the bidirectional voltage regulator diode D23 is connected to +12V_DC, the middle end of the bidirectional voltage regulator diode D23 and one end of the resistor R228 are both connected to DC_VFB, the other end of the resistor R228, one end of the non-polar capacitor C110 and one end of the resistor R229 are all connected to the second pin of the operational amplifier U17A, the other end of the resistor R229 is connected to one end of the non-polar capacitor C111, the first pin of the operational amplifier U17A, the other end of the non-polar capacitor C110 and the other end of the non-polar capacitor C111 are all connected to the dual cathodes of the fast recovery diode D24, the fourth pin of the operational amplifier U17A is grounded and connected to the eighth pin of the operational amplifier U17A through the non-polar capacitor C112, the eighth pin of the operational amplifier U17A is connected to +12V_DC, and the common anode of the fast recovery diode D24 is the signal output terminal DC_VO_CTR of the PID control circuit module (1-4).

7. A DC high frequency switching power supply output voltage regulation system according to claim 1, characterized in that: The key circuit module (2-3) comprises a key S1, a key S2, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a non-polar capacitor C12 and a non-polar capacitor C13; the first pin, the second pin and one end of the resistor R13 of the key S1 are all connected to one end of the resistor R15; the other end of the resistor R13 is a first signal output terminal KEY1 of the key circuit module (2-3) and is grounded via the non-polar capacitor C12; the other end of the resistor R15 is connected to +5V; the first pin, the second pin and one end of the resistor R14 of the key S2 are all connected to one end of the resistor R16; the other end of the resistor R14 is a second signal output terminal KEY0 of the key circuit module (2-3) and is grounded via the non-polar capacitor C13; the other end of the resistor R16 is connected to +5V; the third pin and the fourth pin of the key S1 and the third pin and the fourth pin of the key S2 are all grounded.

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