Two-path symmetrical-output adjustable power source
A technology of symmetrical output and power supply, applied in the field of electronics, can solve the problem of large power consumption of the regulating tube, and achieve the effect of low power consumption, high performance and expanding the output voltage range.
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Embodiment 1
[0057] see figure 1 , which is a schematic diagram of Embodiment 1 of the dual-channel symmetrical output adjustable power supply provided by the present invention.
[0058] A dual-channel symmetrical output adjustable power supply provided in this embodiment includes: a switching power supply module 100, a positive adjustment module 200, a negative adjustment module 300, and a first operational amplifier A1;
[0059] The first input terminal of the switching power supply module 100 is connected to a DC power supply Vin, and the switching power supply module is used to output positive voltage +V and negative voltage -V according to the error between the reference voltage Vref and the output voltage of the first operational amplifier A1. ; The positive voltage +V and the negative voltage -V share a common ground and are equal in absolute value;
[0060] It should be noted that the reference voltage Vref may be 1.25V, 2.5V or 5V.
[0061] The value of the positive voltage +V s...
Embodiment 2
[0071] see figure 2 , this figure is a schematic diagram of Embodiment 2 of the dual-channel symmetrical output adjustable power supply provided by the present invention, compared with figure 1 As shown, a more specific structure for realizing the adjustable power supply is provided.
[0072] The positive adjustment module includes: a first adjustment tube 201, a first resistor R1, a second resistor R2 and a second operational amplifier A2;
[0073] The first end of the first adjustment transistor 201 is connected to the positive voltage +V, the second end of the first adjustment transistor 201 is connected to the positive output voltage +Vout, and the control end of the first adjustment transistor 201 is connected to The output terminal of the second operational amplifier A2;
[0074] The inverting input terminal of the second operational amplifier A2 is connected to the positive output voltage +Vout through the first resistor R1, and the non-inverting input terminal of th...
Embodiment 3
[0090] see image 3 , this figure is a schematic diagram of the third implementation of the dual-channel symmetrical output adjustable power supply provided by the present invention, compared with figure 2 As shown, a more specific circuit implementation structure of an adjustable power supply is provided.
[0091] The dual-channel symmetrical output adjustable power supply also includes: a symmetrical control module;
[0092] It can be understood that the switching power supply uses the dual-wire parallel winding process of the transformer secondary and the device parameter control of the output circuit, which in principle has guaranteed the symmetrical output of positive voltage +V and negative voltage -V. Symmetrical control module, used to prevent light load oscillation and avoid output asymmetry caused by inconsistent load.
[0093] The symmetrical control module includes: a fourth operational amplifier A4, a positive load adjustment module 401, a negative load adjustm...
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