CN209217950U - A kind of numerical control constant-current power supply circuit based on STC89C52 single chip - Google Patents

Abstract

The utility model relates to a kind of numerical control constant-current power supply circuit based on STC89C52 single chip, circuit is made of step-down rectifier filter unit, voltage regulation filtering unit, controller unit, push-button unit, display unit, D/A unit, PWM-BUCK unit, step-down rectifier filter unit is connect with voltage regulation filtering unit, voltage regulation filtering unit is connect with PWM-BUCK unit, and push-button unit, display unit, D/A unit are connect with controller unit respectively.Monolithic machine testing key setting value, is shown by display unit, and controls D/A unit output 1V~3.5V, and then control PWM-BUCK unit and export 0mA~1000mA.Finally, circuit output 0mA~1000mA, stepping 10mA adjustment；For circuit using switch constant current mode, power-efficient is high, and calorific value is few.

Description

A kind of numerical control constant-current power supply circuit based on STC89C52 single chip

Technical field

The utility model relates to a kind of numerical control constant-current power supply circuit based on STC89C52 single chip, belongs to electronic technology and answers Use field.

Background technique

In practical applications, many electronic systems have required that stable DC stream source powers, especially in instrument instrument In table enterprise and laboratory, DC current source is widely used as a kind of electronic equipment of indispensability.General direct current Current source is often fixed to export a kind of current value or only several grades of current values, using inconvenience.Though some current sources are able to achieve number It controls but set output current value error is larger, and constant-current source fever in part is high, low efficiency.

Utility model content

To solve the above-mentioned problems, the utility model provides a kind of numerical control constant-current supply based on STC89C52 single chip Circuit is arranged by key, exports in 0mA~1000mA settable 100 grades, improves degree of regulation, while circuit is using switch Constant current mode, power supply improve efficiency, and reduce calorific value.

The specific technical solution that the utility model is taken is as follows:

A kind of numerical control constant-current power supply circuit based on STC89C52 single chip, it is characterized in that: the circuit includes step-down rectifier Filter unit, voltage regulation filtering unit, controller unit, push-button unit, display unit, D/A unit, PWM-BUCK unit, electricity Lu Zhong, step-down rectifier filter unit are connect with voltage regulation filtering unit, and voltage regulation filtering unit is connect with PWM-BUCK unit, key list Member, display unit, D/A unit are connect with controller unit respectively.

The step-down rectifier filter unit includes 1 transformer T1,1 rectifier B1,1 470uF electrolytic capacitor C1；Surely Pressing filter unit includes 1 5V voltage-stabiliser tube LM7805,2 470uF electrolytic capacitor C2~C3,1 104 ceramic disc capacitor C4；Monolithic Machine unit includes 1 STC89C52 single chip U2,1 12MHz crystal oscillator Y1,2 30pF ceramic disc capacitor C8~C9,1 104 capacitor C5,1 10K Ω resistance R1,1 key S1,1 10K Ω exclusion RP1,1 row needle port J1；Push-button unit includes 2 keys S2~S3；Display unit includes 1 LCD1602 liquid crystal display LCD1,1 10K Ω adjustable resistance W1；D/A unit includes 1 A TLC5615 analog-digital chip U4 and 2 10K Ω resistance R3~R4；PWM-BUCK unit includes 1 SG3524J pulsewidth tune Type processed controls chip U3,1 P-channel metal-oxide-semiconductor Q1,1 2N5551 triode Q2,1 2N5401 triode Q3,1 1N3880 Diode D1,1 4700uf electrolytic capacitor C5,1 102 ceramic disc capacitor C7,1 103 ceramic disc capacitor C10,1 10K adjustable electric Hinder W2,1 10K Ω resistance R2,1 1K Ω resistance R4,1 50K Ω resistance R6,1 0.5 Ω resistance R7,1 1K Ω resistance R8,1 330uH inductance L1,1 output port J2, Q1 choose IRF9540.

In the circuit, the input of transformer T1 terminates 220V alternating current, and output is connected to the 1st, the 3 pin both ends of B1；C1 Anode connect the 2nd foot of B1, cathode ground connection；The anode of C2 connects the 2nd foot of B1, cathode ground connection；The 1st foot of U1 connects the 2nd foot of B1, 2nd pin ground connection；The anode of C3 connects the 3rd foot of U1, cathode ground connection；C4 is connected in parallel on the both ends of C3；S1 mono- terminates the 3rd foot of U1, The 9th pin of another termination U2；C5 is connected in parallel on the both ends of key；R1 mono- terminates the 9th pin of U2, other end ground connection；The of J1 1,2 pins connect the 11st of U2 the, 10 pins respectively；The 18th pin of a termination U2 of C8, other end ground connection；A termination U2's of C9 19th pin, other end ground connection；Y1 is connected in parallel on the 18th of U2 the, 19 pin both ends；The 1st~9 pin of RP1 is coupled with the of U2 40~31 pins；The 20th pin of U2 is grounded, the 31st, 40 pins connect the 3rd pin of U1；S2 mono- terminates the 12nd pin of U2, separately One end ground connection；S3 mono- terminates the 13rd pin of U2, other end ground connection；LCD1 the 1st, 16 pins ground connection, the 2nd, 15 pins meet U1 The 3rd pin, the 3rd pin is grounded by W1, and the 4th~6 pin connects the 26th~28 pin of U2 respectively, the 7th~14 pin difference Connect the 39th~32 pin of U2；The 1st~3 pin of U4 is coupled with the 23rd~21 pin of U2, the 4th pin ground connection, the 6th pin The 2nd pin of U3 is connect, the 8th pin connects the 3rd pin of U1；R3 is connected in parallel on the 6th of U4 the, 8 pin both ends；R5 be connected in parallel on U4 the 5th, 6 pin both ends；U3 the 4th, 5,8,11,14 pins ground connection, be grounded after the 9th pin serial connection C7, R6, the 7th pin is grounded through C10, 6th pin is grounded through R8, the 12nd, 13 pins the 2nd pin of B1 is followed by through R2, the 15th pin is connected to the 2nd pin of B1；Q1's The pole S is connected to the 2nd pin of B1, and the pole D is connected to the 1st pin of J2 through L1；The pole B of Q2 and Q3 is connected to the 12nd pin of U3, and the pole E is connected in It is followed by the pole G of Q1 together, the pole C of Q2 connects the 2nd pin of B1, the pole the C ground connection of Q3；The plus earth of D1, pin meet the D of Q1 Pole；W2 mono- terminates the 3rd pin of U1, and the other end is connected to the 2nd pin of J2 through R4；The 1st pin of U3 is connected between W2 and R4；R7 The 2nd pin of one termination J2, other end ground connection.

The utility model has the following beneficial effects: a kind of numerical control constant-current power supply circuit based on STC89C52 single chip, output 0mA~1000mA, stepping 10mA adjust function；Meanwhile circuit, using switch constant current mode, power-efficient is high, and calorific value is few.

Detailed description of the invention

Fig. 1 is the general frame of the utility model.

Fig. 2 is the step-down rectifier filter unit of the utility model.

Fig. 3 is the voltage regulation filtering unit of the utility model.

Fig. 4 is the controller unit of the utility model.

Fig. 5 is the push-button unit of the utility model.

Fig. 6 is the display unit of the utility model.

Fig. 7 is the D/A unit of the utility model.

Fig. 8 is the PWM-BUCK unit of the utility model.

Fig. 9 is the internal structure block diagram of SG3524J.

Specific embodiment

The utility model is described further with reference to the accompanying drawing.

As shown in Figure 1, a kind of numerical control constant-current power supply circuit based on STC89C52 single chip, it is characterized in that: the circuit packet Include step-down rectifier filter unit, voltage regulation filtering unit, controller unit, push-button unit, display unit, D/A unit, PWM- BUCK unit, in circuit, step-down rectifier filter unit is connect with voltage regulation filtering unit, voltage regulation filtering unit and PWM-BUCK unit Connection, push-button unit, display unit, D/A unit are connect with controller unit respectively.

As shown in Fig. 2, the step-down rectifier unit includes 1 transformer T1,1 rectifier B1,1 470uF electrolysis electricity Hold C1, the input of transformer T1 terminates 220V alternating current, and output is connected to the 1st, the 3 pin both ends of B1；The anode of C1 connects the 2nd of B1 Foot, cathode ground connection.

As shown in figure 3, the voltage regulation filtering unit include 1 5V voltage-stabiliser tube LM7805,2 470uF electrolytic capacitor C2~ C3；The anode of 1 104 ceramic disc capacitor C4, C2 connect the 2nd foot of B1, cathode ground connection；The 1st foot of U1 connects the 2nd foot of B1, the 2nd pin Ground connection；The anode of C3 connects the 3rd foot of U1, cathode ground connection；C4 is connected in parallel on the both ends of C3.

As shown in figure 4, the single machine unit includes 1 STC89C52 single chip U2,1 12MHz crystal oscillator Y1,2 30pF ceramic disc capacitor C8~C9,1 104 capacitor C5,1 10K Ω resistance R1,1 key S1,1 10K Ω exclusion RP1,1 Arrange the 3rd foot that needle port J1, S1 mono- terminates U1, the 9th pin of another termination U2；C5 is connected in parallel on the both ends of key；R1 mono- is terminated The 9th pin of U2, other end ground connection；J1 the 1st, 2 pins connect the 11st of U2 the, 10 pins respectively；The 18th of a termination U2 of C8 Pin, other end ground connection；The 19th pin of a termination U2 of C9, other end ground connection；Y1 is connected in parallel on the 18th of U2 the, 19 pins two End；The 1st~9 pin of RP1 is coupled with the 40th~31 pin of U2；The 20th pin of U2 is grounded, the 31st, 40 pins connect U1's 3rd pin.

As shown in figure 5, the push-button unit includes the 12nd pin that 2 key S2~S3, S2 mono- terminate U2, another termination Ground；S3 mono- terminates the 13rd pin of U2, other end ground connection.

As shown in fig. 6, the display unit includes 1 LCD1602 liquid crystal display LCD1,1 10K Ω adjustable resistance W1, LCD1 the 1st, 16 pins ground connection, the 2nd, 15 pins connect the 3rd pin of U1, the 3rd pin passes through W1 ground connection, the 4th~6 pin The 26th~28 pin of U2 is connect respectively, and the 7th~14 pin connects the 39th~32 pin of U2 respectively.

As shown in fig. 7, the D/A unit include 1 TLC5615 analog-digital chip U4 and 2 10K Ω resistance R3~ The 1st~3 pin of R4, U4 are coupled with the 23rd~21 pin of U2, the 4th pin ground connection, and the 6th pin connects the 2nd pin of U3, the 8 pins connect the 3rd pin of U1；R3 is connected in parallel on the 6th of U4 the, 8 pin both ends；R5 is connected in parallel on the 5th of U4 the, 6 pin both ends.

As shown in figure 8, the PWM-BUCK unit includes that 1 SG3524J pulse width modulation type controls chip U3,1 P-channel Metal-oxide-semiconductor Q1,1 2N5551 triode Q2,1 2N5401 triode Q3,1 1N3880 diode D1,1 4700uf electrolysis electricity Hold C5,1 102 ceramic disc capacitor C7,1 103 ceramic disc capacitor C10,1 10K adjustable resistance W2,1 10K Ω resistance R2,1 1K Ω resistance R4,1 50K Ω resistance R6,1 0.5 Ω resistance R7,1 1K Ω resistance R8,1 330uH inductance L1,1 output end Mouthful J2, Q1 choose IRF9540, U3 the 4th, 5,8,11,14 pins ground connection, be grounded after the 9th pin serial connection C7, R6, the 7th pin warp C10 ground connection, the 6th pin is grounded through R8, the 12nd, 13 pins the 2nd pin of B1 is followed by through R2, the 15th pin is connected to the 2nd of B1 Pin；The pole S of Q1 is connected to the 2nd pin of B1, and the pole D is connected to the 1st pin of J2 through L1；The pole B of Q2 and Q3 is connected to the 12nd of U3 and draws Foot, the pole E, which connects together, is followed by the pole G of Q1, and the pole C of Q2 connects the 2nd pin of B1, the pole the C ground connection of Q3；The plus earth of D1, draws Foot connects the pole D of Q1；W2 mono- terminates the 3rd pin of U1, and the other end is connected to the 2nd pin of J2 through R4；It is connected to U3's between W2 and R4 1st pin；R7 mono- terminates the 2nd pin of J2, other end ground connection.

During this example is implemented, controller chooses STC89C52, and the key for being responsible for entire circuit reads, DAC control, shows control System.STC89C52RC is a kind of low-power consumption of STC Corporation's production, 8 8-digit microcontroller of high-performance CMOS, has 8K byte system Programmable flash storage.STC89C52 uses classical MCS-51 kernel, 51 SCM programs of compatible tradition.

During this example is implemented, display output electric current chooses LCD1602 liquid crystal display, is a kind of industrial character mode lcd, energy Enough while display 2 rows, 16 character of every row.

During this example is implemented, D/A unit uses 10 digital analog converter TLC5615, and the digital signal that single-chip microcontroller U2 is controlled turns It is melted into analog signal.TLC5615 is Texas Instruments product, has the digital analog converter of serial line interface, and output is Voltage-type, maximum output voltage are twice of reference voltage value.It is defeated since the 3rd pin of LM7805 voltage-stabiliser tube is output pin Voltage sheet is 5V out, and the reference voltage (the 6th pin REF) of TLC5615 is divided by R3 and R5 is provided as 2.5V, therefore TLC5615 7 pin maximum output voltages be 5V.

During this example is implemented, circuit uses switch constant current mode to improve circuit efficiency, and main modular is PWM-BUCK unit. PWM-BUCK unit is mainly made of PWM generator and BUCK circuit.PWM generator chooses SG3524J.SG3524J internal junction Structure is as shown in Figure 9.SG3524J is the both-end output type pulsewidth modulation of American Silicon General Corporation (Silicon General) production Chip, the working frequency for the PWM type Switching Power Supply being made of it is up to 100kHz, and oscillator frequency is by the 6th, the 7th of SG3524J Pin external capacitor CT and external resistor RT is determined.1st, 2 feet are respectively the end reversed, in the same direction of error amplifier, and the 3rd draws Foot is synchronous end, the 4th, 5 feet be respectively current limit detection in the same direction, backward end, the 6th, 7 pins be oscillator pin, the 8th pin For ground terminal, the 9th pin is PWM generator compensating end, and the 10th pin is shutdown control terminal, the 11st, 12 pins respectively inside The pole E, C of triode A pipe, the 13rd, 14 pins be respectively internal triode B pipe the pole C, E, the 15th pin is power supply, and the 16th draws Foot is reference voltage output foot.The 7th pin of the non-inverting input terminal connection U4 of PWM generator internal error amplifier, with monolithic For the DAC output valve (voltage of the 7th pin of U4) that machine U2 is set as benchmark voltage, error amplifier inverting input terminal connects circuit Electric current exports feedback letter end (between W2 and R4), so that the reference voltage signal with non-inverting input terminal is compared, realizes that constant current is defeated Out.Therefore, single-chip microcontroller need to only control U4 and export stable voltage, and output can be obtained by constant electric current.When supply voltage drops When low or load reduction, the voltage on sampling resistor R7 will also be reduced, then the duty ratio of 12, the 13 pins output square wave of SG3524 Increase, so that Q1 turn-on time is elongated, R7 both end voltage is made to go back up to original stationary value.When input supply voltage increases or bears Carry increase cause R7 both end voltage increase when, principle with it is preceding similar, circuit makes R7 both end voltage drop to original by feedback system The stationary value come, to achieve the purpose that automatic stabilisation load current.

During this example is implemented, when STC89C5 mcu programming, the DA value range of TLC5615 is set in program as 205~716, Liquid crystal display corresponds to 0mA~1000mA, at this point, the 7th pin output area is 1V~3.5V, access load is made by adjusting W2 Load end electric current corresponds to 0mA~1000mA；When key S2 is pressed, DA value adds 5.11, and corresponding liquid crystal display is on original basis Upper plus 10mA, at this point, the output of the 7th pin increases 0.025V, load both ends electric current, which can export, increases 10mA；When key S3 is pressed When, DA value subtracts 5.11, and corresponding liquid crystal display subtracts 10mA on the basis of the original, at this point, the output of the 7th pin reduces 0.025V, bears Reduction 10mA can be exported by carrying both ends electric current.Both ends electric current is loaded it is achieved thereby that changing by key S2, S3, output 0mA~ The function of 1000mA, stepping 10mA adjustment.

Claims (3)

1. a kind of numerical control constant-current power supply circuit based on STC89C52 single chip, it is characterized in that: the circuit includes step-down rectifier filter Wave unit, voltage regulation filtering unit, controller unit, push-button unit, display unit, D/A unit, PWM-BUCK unit, circuit In, step-down rectifier filter unit is connect with voltage regulation filtering unit, and voltage regulation filtering unit is connect with PWM-BUCK unit, key list Member, display unit, D/A unit are connect with controller unit respectively.

2. a kind of numerical control constant-current power supply circuit based on STC89C52 single chip according to claim 1, it is characterized in that: institute Stating step-down rectifier filter unit includes 1 transformer T1,1 rectifier B1,1 470uF electrolytic capacitor C1；Voltage regulation filtering unit Including 1 5V voltage-stabiliser tube LM7805,2 470uF electrolytic capacitor C2~C3,1 104 ceramic disc capacitor C4；Single machine unit includes 1 A STC89C52 single chip U2,1 12MHz crystal oscillator Y1,2 30pF ceramic disc capacitor C8~C9,1 104 capacitor C5,1 10K Ω Resistance R1,1 key S1,1 10K Ω exclusion RP1,1 row needle port J1；Push-button unit includes 2 key S2~S3；Display Device unit includes 1 LCD1602 liquid crystal display LCD1,1 10K Ω adjustable resistance W1；D/A unit includes 1 TLC5615 number Mould conversion chip U4 and 2 10K Ω resistance R3~R4；PWM-BUCK unit includes that 1 SG3524J pulse width modulation type controls chip U3,1 P-channel metal-oxide-semiconductor Q1,1 2N5551 triode Q2,1 2N5401 triode Q3,1 1N3880 diode D1,1 4700uf electrolytic capacitor C5,1 102 ceramic disc capacitor C7,1 103 ceramic disc capacitor C10,1 10K adjustable resistance W2,1 10K Ω Resistance R2,1 1K Ω resistance R4,1 50K Ω resistance R6,1 0.5 Ω resistance R7,1 1K Ω resistance R8,1 330uH inductance L1,1 output port J2, Q1 choose IRF9540.

3. a kind of numerical control constant-current power supply circuit based on STC89C52 single chip according to claim 1, it is characterized in that: institute It states in circuit, the input of transformer T1 terminates 220V alternating current, and output is connected to the 1st, the 3 pin both ends of B1；The anode of C1 meets B1 The 2nd foot, cathode ground connection；The anode of C2 connects the 2nd foot of B1, cathode ground connection；The 1st foot of U1 connects the 2nd foot of B1, and the 2nd pin connects Ground；The anode of C3 connects the 3rd foot of U1, cathode ground connection；C4 is connected in parallel on the both ends of C3；S1 mono- terminates the 3rd foot of U1, another termination U2 The 9th pin；C5 is connected in parallel on the both ends of key；R1 mono- terminates the 9th pin of U2, other end ground connection；J1 the 1st, 2 pins difference Connect U2 the 11st, 10 pins；The 18th pin of a termination U2 of C8, other end ground connection；The 19th pin of a termination U2 of C9, separately One end ground connection；Y1 is connected in parallel on the 18th of U2 the, 19 pin both ends；The 1st~9 pin of RP1 is coupled with the 40th~31 pin of U2； The 20th pin of U2 is grounded, the 31st, 40 pins connect the 3rd pin of U1；S2 mono- terminates the 12nd pin of U2, other end ground connection；S3 The 13rd pin of one termination U2, other end ground connection；LCD1 the 1st, 16 pins ground connection, the 2nd, 15 pins connect the 3rd pin of U1, the 3 pins are grounded by W1, and the 4th~6 pin connects the 26th~28 pin of U2 respectively, the 7th~14 pin connect respectively U2 the 39th~ 32 pins；The 1st~3 pin of U4 is coupled with the 23rd~21 pin of U2, the 4th pin ground connection, and the 6th pin connects the 2nd of U3 and draws Foot, the 8th pin connect the 3rd pin of U1；R3 is connected in parallel on the 6th of U4 the, 8 pin both ends；R5 is connected in parallel on the 5th of U4 the, 6 pin both ends； U3 the 4th, 5,8,11,14 pins ground connection, be grounded after the 9th pin serial connection C7, R6, the 7th pin is grounded through C10, and the 6th pin is through R8 Ground connection, the 12nd, 13 pins the 2nd pin of B1 is followed by through R2, the 15th pin is connected to the 2nd pin of B1；The pole S of Q1 is connected to B1's 2nd pin, the pole D are connected to the 1st pin of J2 through L1；The pole B of Q2 and Q3 is connected to the 12nd pin of U3, and the pole E, which connects together, to be followed by The pole G of Q1, the pole C of Q2 connect the 2nd pin of B1, the pole the C ground connection of Q3；The plus earth of D1, pin connect the pole D of Q1；W2 mono- is terminated The 3rd pin of U1, the other end are connected to the 2nd pin of J2 through R4；The 1st pin of U3 is connected between W2 and R4；R7 mono- terminates J2's 2nd pin, other end ground connection.