Stabilized DC power supply circuit
A DC power supply, stable technology, applied in the field of stable DC power supply circuits, can solve the problems of not considering the change of the current amplification factor of the output transistor, insufficient suppression effect, and large area occupied by the current detection resistor
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no. 1 example
[0098] A first embodiment of a stabilized DC (direct current) power supply circuit (stabilized DC power supply unit) according to the present invention will be described below. figure 1 is a circuit diagram of a stabilized DC power supply circuit 1 (hereinafter simply referred to as "power supply circuit 1") according to the first embodiment.
[0099] The power supply circuit 1 includes: an output transistor Q1 composed of a PNP bipolar transistor; a drive transistor Q3 composed of an NPN bipolar transistor; an output current limiting circuit 2 that limits the output current Io of the power supply circuit 1; correction (inhibition) is performed by the output A correction circuit 3 for changing the size of the output current Io limited by the current limiting circuit 2 ; voltage dividing resistors R1 and R2 ; an error amplifier 7 and a reference voltage source 8 .
[0100] The output current limiting circuit 2 includes a differential amplifier, resistors R3 and R4 and a constan...
no. 2 example
[0132] A second embodiment of the stabilized DC power supply circuit (stabilized DC power supply unit) according to the present invention will be described below. figure 2 is a circuit diagram of a stabilized DC power supply circuit according to a second embodiment of the present invention (hereinafter simply referred to as "power supply circuit 1a"). exist figure 2 in, with figure 1 The same parts are denoted by the same reference numerals, so that repeated description of the same parts is omitted in principle.
[0133] The power supply circuit 1a includes: an output transistor Q1; a drive transistor Q3; an output current limiting circuit 2a for limiting the output current Io of the power supply circuit 1a; Correction circuit 3 a ; voltage dividing resistors R1 and R2 , error amplifier 7 and reference voltage source 8 . That is, the power supply circuit 1a has the figure 1 Same circuit structure and operation, except figure 1 The output current limiting circuit 2 and t...
no. 3 example
[0153] First, a stabilized DC power supply circuit (stabilized DC power supply unit) according to a third embodiment of the present invention will be described as follows. Figure 9 is a circuit diagram of a stabilized DC power supply circuit 1c (hereinafter simply referred to as "power supply circuit 1c") according to the third embodiment. exist Figure 9 with the same designation as the figure 1 devices that are the same as those of those devices, so that repeated descriptions of the same devices are omitted in principle.
[0154] The power supply circuit 1c includes an output transistor Q1, a drive transistor Q3, an "output current limiting circuit 2c composed of a transistor Q5, resistors R3 and R4", a "correction circuit 3c composed of a correction transistor Q2, a transistor Q6 and a resistor R5", and a transistor Q4 , voltage dividing resistors R1 and R2, error amplifier 7 and reference voltage source 8. Transistor Q4 can be regarded as both a device of the output cu...
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