The power supply circuit block diagram of the machine is shown in the figure. The function and function of the components in the figure are as follows:
(1) The anti-jamming and rectifying circuit is mainly composed of: T901, T902, T905, C902, C907, C908, D904, etc.;
(2) The model number of L904 is: 3220PQ-X01, and the model number of D903 is: MUR860;
(3) C922 is a small electrolytic capacitor of 150 μF/450 V, and C919 is 10 nF/1 kV;
(4) The main switching transformer T904 is EPC50-003, the main switching tube V907 is 1N60C3, and the Feng switch control circuit N904 is NCP1207DR2;
(5) EMC system N902 is MC33260D, V906 is 11M60C3;
(6) P24 V detection N908 is TL431ACD;
(7) The secondary power control circuit N903 is TNY264;
(8) Sub power switch transformer T903 is 16ES-X70X:
(9) N902 and N905 are both PS2701-1, N906 is TL43l, and V901, V902, V903, and V904 are all MMBT3906.
The AC220V enters the anti-interference and filter circuit consisting of T901, T902, T905 and other inductive coils, C902, C907, C908, etc., to filter out interference clutter in the power grid and prevent the impact of surge current.
It is rectified by D904 full-bridge rectification, and sent to the main filter capacitors C922 and C919 to filter the AC ripple. After rectification and filtering, a DC voltage of about 300 V is obtained: one is sent to the main switching power supply circuit; the other is sent to the sub-switching power supply circuit.
The output pulse voltage of the (15) and (16) pins of the T904 secondary is filtered by D914, D915, C939 and C940, and the voltage of about 23.5 V is obtained, which is used as the main supply voltage of the whole machine and is supplied to the subsequent load.
The working state of the switching transformer T904 of the main power source is controlled by the main switching tube V907 (11N60C3), and the turning on and off of the main switching tube V907 is controlled by the square wave of the output of the main switching power supply control circuit N904 (NCPl207DR2) (5). . The (2) pin of the N904 is a control terminal for whether the power supply is working. When the high level is working normally, the power supply stops working when the level is low.
In this power supply, the standby of the power supply and the protection control of the main voltage are realized by controlling the N904 (2) pin. The N904 (8) pin is the initial start pin, and the 300 V DC high voltage is derated and depressurized by R933 and R934 (both 10 k Ω), and is used as the initial operating voltage of N904. After the power supply works, the ripple voltage is output from the N904(4) pin. After R938 current limit, D909 rectification, and C927 and C928 filtering, a DC voltage of about 11 V is obtained, which is sent to the (6) pin of the N904 to provide normal operation. When working voltage. The N908 is a reference circuit with a main voltage of 24 V and detects 24 V stability. Once the 24 V is abnormal, the main switching power supply processing circuit N904 (2) is controlled by the photocoupler: N902 to monitor the working state of the main power supply, thereby realizing the regulation of the 24 V main voltage.
The voltage sent to the sub-switching power supply circuit is directly sent to the secondary switching power supply transformer T903 (6). The secondary (10) pin of the transformer outputs a pulsating AC voltage, which is filtered by an LC filter circuit composed of L908 rectification and L907, C929, C932, and C933, and a voltage of about 5 V is supplied to the subsequent stage circuit. N903 (TNY264) is a sub-switching power supply control circuit and is an environmentally friendly power supply IC. The actual operating current is 200 mA, and the standby power consumption is less than 1 W, which meets the European blue sky power supply standard. The (1) pin is the normal working power terminal. During normal operation, the sub-switching power transformer T903(3), (4) pin induces the ripple voltage to be rectified by D905, R919 current limit and R925, C912, C916 filter to obtain 6 V. Left and right working voltage. The N903 (4) pin is the working state control terminal of the circuit. The low level (O.8 V) works normally, and the entire sub power supply has no output when the level is high.
The N902 and V906 form an EMC system. EMC is the abbreviation of Electromagnetic Compatibility (E1eCTRomagnetic Compatibility). It is a specialized pursuit of coexistence of various electrical equipment (generalized also including organisms) under limited space, time and spectrum resources, without causing performance degradation. System or circuit scheme or discipline.
The EMC function of the LC29K6 power supply part can be summarized into three aspects:
(1) The electromagnetic interference generated by the LC29K6 power supply itself should not cause unacceptable interference to surrounding equipment or household appliances.
(2) The LC29K6 machine power supply itself should not cause unacceptable "contamination" to the surrounding environment.
The LC29K6 power supply should have sufficient resistance to electromagnetic interference from the surrounding environment. Normally, the rectified and filtered 300V voltage supplies the working power to the (7) pin of the N902 via R918 and R920.
The N902 (6) pin is the control terminal, the high level is working normally, and the low level is cut off.
V906 is a switch tube controlled by N902, and its conduction state is controlled by the (5) leg of N902. The EMC switch V906 is connected between the DC voltage of 300 V and the ground, and its working state is high-frequency gap conduction and cut-off, thereby achieving improvement and shearing of the power conduction angle and achieving EMC control.
The power supply is a high level boot control. Normally, the CPU will send a high level to V905 to the N902 (HllA817) optocoupler. The secondary control of the N902 (H11A817) photoelectric coupler is divided into two ways: one reaches the main power control circuit N904 (2) through V901, V902, V903, and realizes the control of the output and shutdown of the 24 V main voltage; The road reaches the N902 (6) pin of the EMC system through V904, controls the working state of the N902, and then adjusts the 300 V DC voltage through the V906 to realize the sleep and cutoff output of the entire power supply.
Among the 8-pin plug wires of the power board unit, the brown is the 5 V sub power supply output line, the purple is the on/off command line, and the red is the 24 V power line, and the black is the ground line.
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