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A technology of linear power supply and resistance, applied in the direction of electrical components, adjusting electric variables, instruments, etc., can solve problems such as inability to accurately control output current
Active Publication Date: 2018-02-23
RIGOL
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[0005] The main purpose of the embodiments of the present invention is to provide a linear power supply to solve the defect that the existing linear power supply cannot precisely control the output current due to the existence of wire resistance and terminal contact resistance
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Embodiment 1
[0060] This embodiment provides a linear power supply, such as Figure 4 As shown, the linear power supply includes: rectification filter circuit S, transistor Q1, diode D1, error amplifier, sampling resistor Rs, differential amplifier, first resistor R1, second resistor R2, third resistor R3, fourth resistor R4, Five resistors R5 and sixth resistor R6;
[0061] The positive output terminal of the rectification filter circuit S is connected to the collector of the triode tube, and the negative output terminal is connected to the negative output terminal of the linear power supply;
[0062] The base of the triode Q1 is connected to the anode of the diode D1;
[0063] One end of the sampling resistor Rs is connected to the emitter of the triode Q1, and the other end is connected to the positive output end of the linear power supply;
[0064] The cathode of the diode D1 is connected to the output terminal of the error amplifier;
[0065] The non-inverting input terminal of the...
Embodiment 2
[0102] This embodiment provides another linear power supply, such as Figure 6 As shown, the linear power supply includes: rectification filter circuit S, transistor Q1, diode D1, error amplifier, sampling resistor Rs, non-inverting amplifier, first resistor R1, second resistor R2, fifth resistor R5 and sixth resistor R6;
[0103] The positive output terminal of the rectification filter circuit S is connected to the collector of the triode tube, and the negative output terminal is connected to the negative output terminal of the linear power supply;
[0104] The base of the triode Q1 is connected to the anode of the diode D1;
[0105] One end of the sampling resistor Rs is connected to the emitter of the triode Q1, and the other end is connected to the positive output end of the power supply;
[0106] The cathode of the diode D1 is connected to the output terminal of the error amplifier;
[0107] The non-inverting input terminal of the error amplifier is grounded;
[0108] On...
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Abstract
The present invention provides a linear power supply, which is characterized in that it includes: a mains port, a transformer, a rectifier bridge, a capacitor, a triode, a diode, an error amplifier, a sampling resistor, a differential amplifier, a first resistor, a second resistor, a third resistor, The fourth resistor, the fifth resistor and the sixth resistor; also provide another linear power supply, including: mains port, transformer, rectifier bridge, capacitor, transistor, diode, error amplifier, sampling resistor, non-inverting amplifier, first resistor, The second resistor, the fifth resistor and the sixth resistor. The present invention uses both ends of the sampling resistor as sampling points to acquire voltage, and inputs the acquired voltage to a differential amplifier or an in-phase amplifier. Since one end of the sampling resistor and the internal reference ground of the linear power supply are not used as sampling points, it can shield wire resistance and The error resistance formed by the terminal contact resistance accurately controls the magnitude of the current passing through the sampling resistance, making the output current of the linear power supply more accurate.
Description
technical field [0001] The present invention relates to the technical field of power supplies, in particular to a linear power supply. Background technique [0002] At present, laboratory power supplies are mostly based on linear principles, such as figure 1 The circuit structure diagram of a typical linear power supply is shown, where V1 is the mains port (including transformer), BD1 is the rectifier bridge, C1 is the capacitor, Q1 is the linear adjustment tube, Rs is the sampling resistor, Vcc_ref is the constant current reference voltage, Vcv_ref is the constant voltage reference voltage, RL is the load, Vout+ is the voltage of the positive output terminal, Vout- is the voltage of the negative output terminal, the circuit uses the positive output terminal as the internal reference ground AGEND, constant current control loop and constant voltage control The loop is connected to the base of the linear adjustment transistor Q1 through an AND gate circuit composed of diodes ...
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