Multi-path power supply control circuit

Abstract

The utility model discloses a multipath power supply control circuit. The power supply control circuit comprises a power supply filtering module, a level conversion module, a load power supply filtering module, a controller module, a latch module, a relay module, a current detection module, a serial port communication module and an external interface module. After the power supply control circuit is used, a threshold value can be set remotely, when the current exceeds the threshold value, the load power supply is cut off, the on-off of the load power supply can be manually and independently controlled, and the current parameter of the load power supply is monitored and uploaded in real time; the power supply current of each load can be monitored in real time, protection can be started at the first time when the current is abnormal, and an operator is notified; when the power supply control program is abnormal, the on-off state of the load power supply can be maintained.

Description

TECHNICAL FIELD

[0001] The utility model relates to a control circuit especially relates to a multi -way power control circuit. BACKGROUND

[0002] At present, when the power control circuit controls the output of multi -way power, can achieve automatic shutdown when exceeding threshold value this way power, but has not reported the current parameter detected, also cannot manually control the on-off of each way load power supply. Therefore, in the prior art, when the power control circuit supplies power for multiple loads, the power state of each load cannot be determined, and each power channel cannot be manually controlled. SUMMARY

[0003] The utility model discloses a kind of multi -way power control boards, including: power supply filter module, level conversion module, load power filter module, controller module, latch module, relay module, current detection module, serial communication module and external interface module.

[0004] To achieve the above object, the technical scheme of the utility model is as follows:

[0005] A kind of multi -way power control board, including: power supply filter module, level conversion module, load power filter module, controller module, latch module, relay module, current detection module, serial communication module and external interface module.

[0006] The level conversion module is connected with the external interface module by power supply filter module, and supplies power for each module of circuit;The current detection module detects the load power current after being from the external interface module, through load power filter module, and is connected with controller module by AD sampling interface, realizes the sampling of load power current;The control module is according to the threshold setting of host computer or manual switch output control signal, control signal is connected with latch module by I / O interface, realizes the latching of control signal;The latch module is connected with the relay module, realizes the control of load power on-off;The control module is connected with the serial communication module by uart interface, and the serial communication module is connected with host computer by external interface module again, and this link realizes parameter real-time reporting, threshold setting and load power each channel manual switch setting.

[0007] As a further improvement of the utility model, the input end data pin of latch in the latch circuit is directly connected with the I / O port of controller module, the output end data pin of latch is connected to relay module, the latch enable pin LE of latch is directly connected with the I / O port of controller circuit U3, and the output enable of latch is directly connected with power supply ground GND.

[0008] As a further improvement of the utility model, the relay module contains multiple relay switch circuits, which respectively control the on-off of each load power supply.

[0009] The freewheeling diode is connected in parallel between the two coil pins of the relay, the negative electrode of the freewheeling diode is directly connected to the power supply +5V, and the positive electrode is directly connected to the collector of the NPN triode; one contact pin of the relay is directly connected to the controlled power supply control output VOUT and sent to the corresponding current detection circuit, and the other contact pin is directly connected to the load power supply VCC_channel; the emitter of the NPN triode is connected to the power supply ground GND, and the base is connected to the control signal output by the latch.

[0010] As a further improvement of the utility model, the current detection module contains multiple current detection circuits, which respectively sample the current of each load power supply and send it to the controller module. Each current detection circuit contains a Hall sensor, a precision resistor, a capacitor, a self-resetting fuse and a TVS tube.

[0011] The power input pin of the Hall sensor is directly connected to the power supply +5V and is connected in parallel with the capacitor for filtering; the ground pin of the Hall sensor is directly connected to the power supply ground GND; the two analog input pins of the Hall sensor are connected to the precision resistor, wherein the positive analog input is connected in parallel with the TVS tube to the power supply ground to suppress transient high voltage, and the negative analog input is connected in series with the self-resetting fuse for overcurrent protection; the analog output pin of the Hall sensor is directly connected to the ADC sampling interface of the controller module for current sampling. Advantages

[0012] By the above scheme, the test system power supply control circuit has at least the following advantages.

[0013] (1) Multiple load power supplies can be remotely and manually controlled independently, and the current parameters of the measured product can be detected and uploaded in real time.

[0014] (2) The power supply current of the load can be monitored in real time, and when there is an abnormal current, the protection can be started in the first time and the operator can be notified.

[0015] (3) When the power supply control board program is abnormal, the control signal can be maintained through the latch, so that the power supply switch state of the measured product is maintained. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of a multiple power supply control circuit of the utility model.

[0017] Figure 2Is the circuit diagram of the power supply filter module of the utility model.

[0018] Figure 3 Is the circuit diagram of the level conversion module of the utility model.

[0019] Figure 4 Is the circuit diagram of the load power filter module of the utility model.

[0020] Figure 5 Is the circuit diagram of the controller module of the utility model.

[0021] Figure 6 Is the circuit diagram of the latch module of the utility model.

[0022] Figure 7 Is the circuit diagram of the relay module of the utility model.

[0023] Figure 8 Is the circuit diagram of the current detection module of the utility model.

[0024] Figure 9 Is the circuit diagram of the serial communication module of the utility model.

[0025] Figure 10 Is the circuit diagram of the external interface module of the utility model. DETAILED DESCRIPTION

[0026] The technical scheme of the utility model will be described in further detail below with the drawings and examples.

[0027] Specifically, as shown in Figure 1 The utility model discloses a kind of multiway power supply control circuit, the power supply control circuit includes power supply filter module 2, level conversion module 1, load power filter module 3, controller module 5, latch module 6, relay module 7, current detection module 9, serial communication module 8 and external interface module 4.

[0028] The level conversion module is connected with external interface by power supply filter circuit, converts working power supply into +5V and +3.3V, and powers each module of circuit board;The current detection module detects channel current after being from external interface, passing through channel power filter module, and is connected with controller module by AD sampling interface;Relay module is connected with controller circuit by I / O interface;Serial communication module is connected with controller module by uart interface.

[0029] As shown in Figure 2As shown, the power supply filter module 2 includes lightning protection tube RV1, rectifier tube D1, TVS tube D2 and D3, fuse F1, common mode inductor L1, filter capacitor C1, C2, C3, C4, wherein the lightning protection tube and TVS tube play the role of instantaneous high voltage protection, the rectifier tube plays the role of anti-reverse connection, the fuse plays the role of overcurrent protection, the common mode inductor plays the role of filtering common mode noise, and the filter capacitor plays the role of filtering differential mode noise. The module protects and filters the working power supply from the external interface module, and then sends the safe and clean power supply to the level conversion module.

[0030] As shown in Figure 3 The level conversion module 1 includes a DC-DC power supply chip U1 and an LDO power supply chip U2. The level conversion module is used to provide direct current power supply for the controller module, the latch module, the relay module, the current detection module and the serial communication module.

[0031] The DC-DC power supply chip U1 receives the power supply input from the power supply filter module, can realize wide range voltage input, and provides +5V power supply output, and then forms +3.3V power supply output through the LDO power supply chip U2. The +5V power supply output is used to power the latch module, the relay module and the current detection module. The +3.3V power supply output is used to power the controller module and the serial communication module.

[0032] As shown in Figure 4 The load power supply filter module 3 includes lightning protection tube RV2, TVS tube D4, fuse F2, filter capacitor C5, C6, C7 and C8, wherein the lightning protection tube and the TVS tube play the role of instantaneous high voltage protection, the fuse plays the role of overcurrent protection, and the filter capacitor plays the role of filtering differential mode noise. The module protects and filters the load power supply input from the external interface module, and then sends the safe and clean power supply to the relay module for power supply control.

[0033] As shown in Figure 5 The controller module 5 is the main control unit of the power supply control circuit, which controls the logic of each module and the running of the algorithm program, realizes the control of the latch module, receives the data of the current detection module, and realizes remote control through the connection of the serial communication module and the external interface.

[0034] The controller module 5 includes U3 master control chip, Y1 crystal oscillator circuit and S1 reset circuit. The controller module is connected with the current monitoring circuit through the ADC sampling interface, realizes the sampling of the current size of each channel, is connected with the latch module through the I / O port, controls the power supply switch of each channel of the relay module, and is connected with the serial communication module through the uart port, and realizes the RS232 communication with the external.

[0035] The J1 in the controller module is a program download interface, the LED 17 can intuitively indicate the running state of the program, and the LED 18 can intuitively indicate the state of the power supply.

[0036] As shown in Figure 6 The latch module 6 includes a latch chip U6, receives and analyzes the control signal from the controller module, and drives the relay to work through the analyzed and latched control signal. When the program of the controller module is abnormal, the control signal of the 11 pin of U6 is pulled low, the output control signal of the latch module is no longer determined by the input control signal, but keeps the original control signal output, so that the relay circuit keeps the original switching state and works normally, without affecting the load power output to the external interface; when the program of the controller circuit is restored to normal, the control signal of the 11 pin of U6 is restored to high level, and the output control signal of the latch circuit is determined by the input control signal again, and the control of the switching state by the program is restored.

[0037] As shown in Figure 7 The relay module 7 includes a relay K1, a patch diode D8, an NPN transistor U8 and a 10k patch resistor R50. The control signal from the latch is input to the base of the NPN transistor U8 through the 10k patch resistor R50, and the NPN transistor controls the energization state of the relay coil. When the control signal is high, the NPN transistor is turned on, the collector is pulled low, the relay coil is energized, and the relay switch is closed; when the control signal is low, the NPN transistor is cut off, the collector is suspended, the relay coil is not energized, and the relay switch is open.

[0038] As shown in Figure 8 The current detection module 9 includes a current detection amplifier U24, a 100mΩ patch precision resistor R66, a patch self-resetting fuse F3 and a TVS tube D24.

[0039] The 100mΩ patch precision resistor R66 is used as a sampling resistor and is connected to the relay circuit for collecting the load power current from the relay circuit; the load power from the relay circuit is converted into a corresponding analog small voltage signal through R66, and then converted into an analog voltage signal by the current detection amplifier U24 and given to U3 of the controller module, and the corresponding current is obtained through conversion to realize sampling of the power current of this channel; the TVS tube D24 is used to protect the 3 pin of U24 to prevent the load power voltage from being too high to break down U24; the patch self-resetting fuse F3 is used to protect the power current of this channel and plays a role of overcurrent protection.

[0040] As shown in Figure 9As shown, the serial communication module 8 includes serial transceiver chip U4, filter capacitors C30, C31, C32, C33, C34 and ESD tube D6. The input and output signals from the controller module U3 are connected to the 11 and 12 pins of the serial transceiver chip U4, which converts the uart port into RS232 signals through the serial communication module, and the 13 and 14 pins of the serial transceiver chip U4 are connected to the external interface module as the input and output of the RS232 signals. The ESD tube D6 is used to protect the input and output pins from static damage to the chip.

[0041] As shown in Figure 10 The external interface module 4 includes terminal sockets J3, J4, rectangular connection socket J5, DR9 elbow female socket J6. The terminal socket J3 is the working power input end, which is connected with the power supply filtering module; the terminal socket J4 is the load power input end, which is connected with the load power filtering module; the rectangular connection socket J5 is the load power output end, which is connected with the current detection module; and the DR9 elbow female socket J6 is the serial external connector, which is connected with the serial communication module.

[0042] The above-described embodiments only express one embodiment of the present application, which is described in detail, but it cannot be understood as a limitation on the scope of the application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the scope of the present application should be subject to the appended claims.

Claims

1. A multiplexed power supply control circuit, characterized by The power supply control circuit comprises a power supply filtering module, a level conversion module, a load power filtering module, a controller module, a latch module, a relay module, a current detection module, a serial communication module and an external interface module; The level conversion module is connected with the external interface module through the power supply filtering module to supply power for each circuit of the circuit board; the current detection module detects the load power current from the external interface module after passing through the load power filtering module, and is connected with the controller module through an AD sampling interface to realize sampling of the load power current; the controller module outputs a control signal according to threshold setting of an upper computer or manual switch, the control signal is connected with the latch module through an I / O interface to realize latching of the control signal; the latch module is connected with the relay module to realize control of the load power on-off; the controller module is connected with the serial communication module through a uart interface, and the serial communication module is connected with the upper computer through the external interface module, and this link realizes real-time reporting of parameters, threshold setting and manual switch setting of each channel of the load power.

2. The multiplexed power supply control circuit of claim 1, wherein, The input data pin of the latch in the latch circuit is directly connected with the I / O port of the controller module, the output data pin of the latch is connected with the relay module, the latch enable pin LE of the latch is directly connected with the I / O port of the controller module, and the output enable OE of the latch is directly connected with the power supply ground GND.

3. The multiplexed power control circuit of claim 1, wherein, The relay module comprises a plurality of relay switch circuits for controlling on-off of each load power; each relay switch circuit comprises a relay, a freewheeling diode and an NPN triode; The freewheeling diode is connected in parallel between the two coil pins of the relay, the negative electrode of the freewheeling diode is directly connected with the power supply +5V, and the positive electrode is directly connected with the collector of the NPN triode; one contact pin of the relay is directly connected with the power supply control output VOUT corresponding to the current detection module, and the other contact pin is directly connected with the load power VCC_channel; the emitter of the NPN triode is connected with the power supply ground GND, and the base is connected with the control signal output by the latch.

4. The multiplexed power control circuit of claim 1, wherein, The current detection module comprises a plurality of current detection circuits for sampling the current of each load power and sending to the controller module; each current detection circuit comprises a Hall sensor, a precision resistor, a capacitor, a self-resetting fuse and a TVS tube; The power supply input pin of the Hall sensor is directly connected with the power supply +5V and is connected in parallel with the capacitor for filtering; the ground pin of the Hall sensor is directly connected with the power supply ground GND; the two analog input pins of the Hall sensor are connected with the precision resistor, wherein the positive analog input pin is connected in parallel with the TVS tube to the power supply ground to suppress transient high voltage, and the negative analog input pin is connected in series with the self-resetting fuse for overcurrent protection; the analog output pin of the Hall sensor is directly connected with the ADC sampling interface of the controller module for current sampling.

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