1、 Basic functions of DC regulated power supply
DC regulated power supply generally has multiple outputs: for example, it provides a fixed output of 5V and 2A; Provide two channels (A and b) with adjustable output of 0 ~ 24V and 0 ~ 1a. The adjustable output generally has two working modes: voltage stabilization and current stabilization. These two working modes are automatically converted with the change of load, and the LED on the front panel of the instrument displays the CV and CC modes. Generally, the green light indicates CV (voltage stabilization) and the red light indicates CC (current stabilization). Some regulated power supplies also provide a-way and b-way series work and master-slave tracking work mode at the same time. If circuit a is the main circuit and circuit B is the slave circuit, when tracking the working mode, the output voltage of the slave circuit changes with the main circuit, which is more suitable for occasions requiring symmetrical bipolar power supply. If two circuits a and B work in series, they can output 0 ~ 48V and 0 ~ 1A DC power supply; In series tracking mode, it can output 0 ~ ± 24V and 0 ~ 1A DC power supply.
2、 Precautions for use
1. According to the required voltage, first adjust the "coarse adjustment" knob, and then gradually adjust the "fine adjustment" knob, so as to achieve correct cooperation. For example, when 12V voltage needs to be output, set the "coarse adjustment" knob to 15V, and then adjust the "fine adjustment" knob to 12V, while the "coarse adjustment" knob should not be set to 10V. Otherwise, the maximum output voltage is less than 12V.
2. After the voltage is adjusted to the required load.
3. During use, if it is necessary to change the "coarse adjustment" gear, disconnect the load first, and then connect the load after the output voltage is adjusted to the required value.
4. During use, when the protection is caused by load short circuit or overload, first disconnect the load, then press the "reset" button, or turn on the power again, the voltage can return to normal operation, and then connect the load after troubleshooting.
5. When various power supplies with different rated currents are used in series, the output current is the rated value of the least rated one.
6. Each power supply has a meter, which indicates the output current or output voltage of this circuit respectively in different states of a / v. It is usually placed in the voltage indication state.
7. Each circuit has two output terminals, red and black. The red terminal represents "+" and the black terminal represents "-". A black terminal connected to the "Earth" symbol in the middle of the panel indicates that the terminal is connected to the chassis and has no electrical connection with each circuit of output. It is only used as a safety wire. It is often taken for granted that the "Earth" symbol indicates grounding, and "+" "-" indicates that the positive and negative power outputs are used to supply power to the dual power operational amplifier.
8. The two voltages can be used in series. Parallel connection is absolutely not allowed. The power supply is a kind of supply instrument, so it is not allowed to short circuit the output terminal for a long time.
3、 Why can't the current or voltage be adjusted when using DC regulated power supply?
Phenomenon 1: output voltage but no current, or current but no voltage
In either case, the power supply has been working normally. The operator should check whether his load is in good contact, whether the load is short circuited or open circuited, whether the load meets the specifications, etc. In extreme cases, if the power supply has voltage output (constant voltage state) and the load line is broken, the natural output current is equal to zero. Similarly, if the power supply has current output (constant current state) and the load is short circuited, the natural output voltage is equal to zero.
Phenomenon 2: when adjusting the voltage, it is found that the no-load voltage cannot be adjusted.
Some operators like to turn the "current regulation" potentiometer to the left, so that the no-load voltage of the power supply can not be adjusted. This shows that he lacks a substantive understanding of "current regulation". Because even if the power supply is at no-load, it will consume a little current, and you turn the "current regulation" to zero and don't release a little current. Of course, the no-load voltage can't rise. Therefore, the "current regulation" is generally not adjusted to zero (the above situation will not happen if it is adjusted to the right for about a quarter of a turn).
General operation method: when it is used as a voltage stabilizing source to output voltage, turn the current regulation knob clockwise to the end and keep it. Adjust the voltage adjustment knob to control the output DC voltage value. When it is used as a current stabilizing source to output current, turn the voltage regulation knob clockwise to the end and keep it. Adjust the current regulation knob to control the output DC current value.
Phenomenon 3: the power supply has voltage output and current output, but if the voltage is adjusted again, the voltage cannot be adjusted. Or the power supply has voltage output and current output. If you want to increase the current, the current will not be adjusted much.
This is because the operator is not very clear about the concepts of "constant voltage" and "constant current". If the "constant voltage" light is on, it indicates that the power supply is working in the constant voltage state (it can be considered that the voltage is in the active position). At this time, the output current is determined by the load rather than adjusted by the operator (it can be said that the current is in the passive position). If you turn the "current regulation" knob right at this time, the current will not increase. But at this time, turn the "voltage regulation" knob to the right, the output voltage will rise, and the output current will also rise. (voltage is master and current is slave).
Similarly, if the "constant current" light is on, it indicates that the power supply is working in the constant current state, and the output voltage is not "adjusted", but determined by the load. Only by adjusting the "current regulation" knob, the output current will change and the output voltage will also change. (here, the current is the master and the voltage is the slave)
In short, we should clarify the relationship between master and slave. When the power supply is in the "constant current" state, the current can be adjusted, and when it is in the "constant voltage" state, the voltage and current on the load can be changed.
