Single-power-supply non-isolated adjustable constant-current source
A non-isolated, single power supply technology, applied in the field of constant current sources, can solve the problems of wasting energy and increasing costs, and achieve the effects of reducing costs, solving high costs, and stabilizing output voltage
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specific Embodiment approach 1
[0008] Specific implementation mode 1. Combination figure 1 Shown specifically illustrates this embodiment. The single power supply non-isolated adjustable constant current source described in this embodiment includes an adjustment unit 1, a power module 2, a central processing unit 3, a D / A conversion unit 4, and a voltage stabilizing circuit 5. Sampling unit 6, feedback unit 7 and output unit 8,
[0009] The adjustment unit 1 is used to output an adjustable voltage signal, the adjustment unit 1 outputs the voltage signal to the power module 2, the power module 2 outputs the corresponding voltage signal to the central processing unit 3, and the central processing unit 3 processes the voltage signal to obtain a digital voltage signal , and send the digital voltage signal to the D / A conversion unit 4, the D / A conversion unit 4 outputs the analog voltage signal to the voltage stabilizing circuit 5, the voltage stabilizing circuit 5 outputs the regulated voltage signal to the sam...
specific Embodiment approach 2
[0012] Embodiment 2. The difference between this embodiment and the single power supply non-isolated adjustable constant current source described in Embodiment 1 is that it also includes a display unit 9, and the display data input end of the display unit 9 is connected to the central processing unit 3 The display data output terminal is used to display the current output current value.
[0013] The voltage is collected by the sampling unit, the current value is calculated by the central processing unit, and the current current value is displayed on the display unit. The output current can be displayed intuitively through the display module.
specific Embodiment approach 3
[0014] Embodiment 3. The difference between this embodiment and the single-power non-isolated adjustable constant current source described in Embodiment 1 is that the central processing unit 3 is a 51 single-chip microcomputer.
[0015] The working principle of the present invention is: the output voltage can be changed by selecting the input voltage value through the adjustment unit, and the central processing unit corresponds to an output digital signal according to the voltage value, and transmits it to the digital-to-analog conversion chip to convert it into a voltage value, which is output and controlled by the stabilizing circuit To output the current signal, a feedback resistor is connected in series at the output current signal terminal. The feedback resistor is a sampling unit, and is transmitted to the central processing unit through the voltage processing of the feedback resistance. The central processing unit captures the The voltage at the feedback terminal changes...
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