TW200950292A - Power supply system and power supply - Google Patents

Abstract

This invention discloses a power supply including a power converter to supply a power source to an electronic circuit through an output cable of the power supply. A communication unit is coupled to the output cable of the power supply to develop a communication channel between the power converter and the electronic circuit in order to report the status of the power converter to the electronic circuit.

Description

200950292 ...f23twf.doc/n IX. Description of the Invention: [Technical Field] The present invention relates to a power supply, and more particularly to a communication circuit for a power supply. [Prior Art] A power supply is used to supply a regulated power source to an electronic circuit (e.g., a battery pack, etc.). The power supply is also used to protect the user from electric shock. The power supply is therefore an important unit for proof of safety requirements. In addition, the power supply will generate thermal energy during power conversion. As a result, a variety of products have been developed to simplify product design using external power supplies or power adapters, such as portable computers and mobile phone chargers. However, the disadvantage of using an external power supply is the lack of information on the power supply, such as output voltage, output current, and operating temperature, which makes power management and protection difficult. SUMMARY OF THE INVENTION The present invention provides a power supply system in which the status of a power converter can be reported to an external electronic circuit for power management and protection. The power supply system of the present invention includes a power converter to supply power to an electronic circuit through an output cable. The communication unit (c〇mmunicati〇n unit) is lightly coupled to the output cable to form a communication channel between the power converter and the electronic circuit. An inductive device, such as avice, is further coupled to the output cable to provide an impedance between the power converter and the communication unit. The communication unit carries the communication information through the output cable to report the status of the power converter to the electronic circuit. The communication data is modulated into a frequency-shift-key (FSK) nickname for transmission. "light

The power converter (p〇Wer c〇nverter) can be reported to external electronic circuits for power management and protection. Μ σ In order to make the above features and advantages of the present invention more comprehensible, the following detailed description of the preferred embodiments and the accompanying drawings are set forth below. [Embodiment] The present invention seeks to provide a communication path between the power supply and the electronic circuit through the output cable of the power supply. Therefore, the communication channel' provided in accordance with an embodiment of the present invention is as shown in Figs. The power supply is crying. The power converter 11 is included for supplying the power supply Ve to the circuit © 20 through the turn-off cable 30. The power supply Ve includes two terminals £+ and ε "communication unit 1" is coupled to the output electron microscope 30 to form a communication channel between the power converter and the circuit 20. The output cable 3 has four terminals wa, WB, WM and WN. Terminals WA and WB are connected to the power supply. Terminals WM and WN are connected to electronic circuit 2 (). Power supply impedance. The inductive device is lightly coupled to the terminal section of the power supply Ve and the Xuanhui of the outgoing cable 30, The inductive device 15 supplies impedance to the power conversion unit η and the communication unit 1〇〇. The resistor 6 200950292 ji zi /23twf.doc/n established by the inductive device 15 forms a communication path on the output cable 30 for data transmission. The unit 100 transmits the communication data by rotating the cable 30 to report the status of the power converter 11 to the electronic circuit 2. The communication unit and the inductive device 15 are located in the power supply 10. The communication unit 1 is coupled to the power conversion. The status data Sn is obtained at the device 11. The status data sN...s〇 contains data of the power converter u, such as the input voltage ';; the voltage and temperature of the turn-off. ❹ Another communication unit 200 and another inductive device 25 are mounted on the electronics Circuit 20. The inductive device 25 is connected to the terminal WM*_ of the output cable 3〇 and the two terminals v+ and v of the load of the electronic circuit 20. The input data DN...DG received by the communication unit 2(8) is transmitted to the electronic circuit A control unit (for example, a CPU) for power management and security. The communication units 100 and 200 implement communication between the power supply 10 and the electronic circuit 2A. The inductive devices 15 and 25 are common. The mode choke (c〇mm〇nm〇de choke )' provides a low impedance path for the power supply γΕ to power the power supply circuit L, which provides a common impedance for the comnTn mode signal. The communication elements 1 and 2 are isolated from the power supply vE. Another preferred embodiment of the invention is illustrated in Figure 3, in which a single-end inductor 16 is used for communication. A high impedance is provided between cell 1 〇〇 and power supply ν: In addition, single-ended inductor 26 is used to provide high impedance between communication unit 2 〇〇 and the load of electronic circuit 20. Although inductor 26 cannot be a power supply Ve Provide a low impedance path to the electronic circuit 2〇, but the inductor 7 200950292 1 ζ, χ /23twf.doc/n The cost of the devices 16 and 26 is lower than the inductive devices 15 and 25 shown in Fig. 2. Fig. 4A illustrates a communication unit 1 according to an embodiment of the present invention. The wheeled data buffer 300 and the interface circuit 400 are included. Figure 4B illustrates an embodiment of another communication unit 2B in accordance with an embodiment of the present invention. The communication unit 200 includes an input data buffer 500 and an interface circuit 400. The interface circuit 400 of the communication unit 2 is the same as the interface circuit of the communication unit 1A. The communication data of the communication unit 100 is modulated into a frequency-shift-key (FSK) signal, and the frequency shift key signal is coupled to the output cable 3 of the power supply 10. The communication unit 1 includes an oscillation circuit (OSC) 150 for generating a frequency shift keying signal in response to the output data (DATA) of the communication unit 1〇〇. The output circuit 410 is coupled to the output cable 3 of the power supply 10 via terminals χι and X2' to output an FSK signal. The operational amplifier 110, the resistor 111, and the transistors 112, 114, 115, 116, 118, and 119 form the wheel-out circuit 410 of the interface circuit 4A of the communication unit 1A. The wheeling signal 乂〇5 of the oscillating circuit 150 (: is an FSK signal generated based on the output data (DATA) of the communication unit 〇 10 。. The output signal

Vosc is connected to the operational amplifier no. The operational amplifier u, the resistor and the transistor 112 form a voltage-current converter to generate a current mirror at the transistor 112 in response to the output signal Vosc of the oscillating circuit 150 to form a current mirror to respectively A current signal im and a current signal 产生 are generated at the electrogranular sign = and 116. The current signal I is connected to the transistor 114. Therefore, the electric = signal Im and the current signal I2 are generated in response to the current signal. The current signal Ili5 is coupled to the transistor 丨i 8 8 200950292 v^i ji ^i /23twf.doc/n The transistors 118 and 119 form another current mirror, which is formed by returning the fskV^;^: signal... FSK The signal passes through the terminal core == to the output cable 30. Without the 2, the handle is closed and the int is lightly coupled to the terminal of the output electron microscope 3〇 and WB 'to receive the FSK signal. Capacitor, 22〇

❿

road. The chopper circuit 250 engages the input circuit to generate the data signal SH and the heart in response to the ship signal. I, Figure 5 shows the output through the output 3. The equivalent circuit of the communication channel. The current signal associated with the inductive device 15 produces a signal vw across the terminals WA and WB of the output cable %.

Vw = 2πχ f xLxAI....................... (1) where / is the frequency of the FSK signal; L is the equivalent inductance of the inductive device; ΔI疋 current彳§ No. ι and 12 difference current (difference current). FIG. 6 illustrates an embodiment of an oscillating circuit 150. When the output data (DATA) is logic-low, the output signal vosc is a low frequency signal. Once the oscillating circuit 150 receives the output data (DATA) as logic-high, the output signal V 〇 sc is a high frequency signal. Current source 151 charges capacitor 170 through switch 161. Current source 152 discharges capacitor 170 through switch 162. Current source 153 is provided in series with switch 163. The current source 153 and the switch 163 are connected in parallel with the current source 151. Current source 154 is coupled in series with switch 164. Current source 154 and switch 164 are connected in parallel with current source 152. Switches 163 and 164 are controlled by the output data (DATA). A comparator 181 having a trip-point voltage VH is connected to the capacitor 170. The ratio of the trip point voltage V1 is 200950292 ^ljl 723twf.doc/n The comparator 182 is connected to the capacitor 170. The NAND gates 183 and i84 form a latch circuit. The non-gate 183 is connected to the wheel of the comparator 181. The non-gate 184 is coupled to the output of the comparator 182. The wheel and the output of the non-shutter ι83 are connected to control the switch 162. f

O ❹ is turned on or off with the output of the non-gate 183 via the inverter 185. Therefore, an oscillating signal is generated at the capacitor 17A to generate an output signal Vosc. The output signal vosc is connected to the capacitor 170 through the switch 190. The switch 19 is enabled or disabled via the enable signal ENB. In addition, a grounded switch 195 is used to disable the output signal v〇sc. The switch 195 is controlled by an enable signal ENB that is inverted by the inverter 187. The frequency shift of the output signal v〇sc for the low frequency F〇sc_l and the high frequency F0SC H can be expressed as: (Vh~Vl)xCi70 Il51 +Il53 (Vh-Vl)xCi7〇

Fosc_l =kx-——~— .................................(2) (3)

Fosc_h = k where none is a constant determined by the ratio of the charging current to the discharging current; Im is the current of the current source 151; 丨 (5) is the current of the current source 153; Cno is the capacitance of the electric grid 170; vH is the double The voltage of the point voltage 乂^^; vl is the voltage of the trip point voltage VL. _ Therefore, the output signal ν 〇 π contains three states. The high frequency fosch represents the horse logic state. Side F〇s (^ low logic state. The disable of the input signal V(10) represents the blank state 'which is controlled by the start number ENB. Figure 7 shows an embodiment of the output data buffer 3〇〇 of the non-communication unit 100 A plurality of flip-flops 319, -.., 311, and 31 are connected in series and store state data Sn. .Sq of power conversion nu. Further, flip-flops 319...310 are configured as shift registers ( Shift register) is used for 200950292 ι ...^i/23twf.doc/n data output. The output of flip flop 319 is connected to AND gate 325. The other input of gate 325 is connected to enable signal ENB. The output produces an output data (DATA). The clock inputs of the flip-flops 319, ..., 311, and 310 are connected to the enable signal ENB through the inverter 320. Therefore, the output data (DATA) is based on the timing rate of the enable signal ENB ( Figure 8 illustrates an embodiment of a 滤波 filter circuit 250 of the interface circuit 4〇〇 of the communication unit 10A shown in Figure 4. The differential amplifier 26A has a negative input, an INM, and a positive input INP, respectively. Connected to capacitors 21〇 and 22〇. Filter 270 and Filter 2 80 is coupled to the output of differential amplifier 26A. Filter 270 is developed to provide fos h's band_pass frequency ' to generate a high logic data signal Sh. Filter 28 is used to decode the bandpass frequency of Fosc l 'To generate a low logic data signal heart. The data signal SH and the data signal S1 are further connected to the input data buffer 500' to generate input data dn...〇0, as shown in Figure 9. Multiple flip-flops 351, 352 , ... and 359 are connected as a shift register to generate data Dn...Dq by β from the continuous input data signal. The D input of the flip-flop 351 is the input of the shift register. The SL is connected to an OR gate 362. The output of the gate 362 is coupled to a one-shot circuit 370' to generate a pulse signal (pulse) to the PLS. The pulse signal PLS is coupled to the flip-flops 351, 352. The clock input of the ..., and 359. The data signal sH is further connected to the AND gate 36. The data signal SL is connected to the other input of the gate 36〇 through the inverter 361. The output of the gate 36〇 is connected to the shift register Input. ~ 11 200950292 \^υι δ. l /23twf.doc/n Figure 10 illustrates an embodiment of a one-shot circuit 370 as shown in Figure 9. The input signal IN of the one-shot circuit 370 is coupled to the input and to the inverter 373. Non-gate 380 input. The output of inverter 373 controls transistor 374. Current source 371 is coupled to charge capacitor 375. Current source 372 is used to discharge capacitor 375 through transistor 374. Capacitor 375 is further coupled to another input of NAND gate 380. The output of the non-gate 380 is connected to the input of the NOR gate 390. The output of the non-gate 380 is used to control the transistor 384. Current source 381 is coupled to charge capacitor 385. A transistor 384 is used to discharge capacitor 385. Capacitor 385 is coupled to another input of or non-gate 390 to generate a pulse signal PLS at the output of OR gate 390. Figure 11 illustrates the waveform of the input signal IN and the pulse signal pls of the one-shot circuit 370 where the current of the current source 371 and the capacitance of the capacitor 375 determine the delay time TD. The current of the current source 381 and the capacitance of the capacitor 385 determine the pulse width Tw of the pulse signal PLS. While the invention has been described above in terms of a preferred embodiment, it is not intended to limit the invention, and it is to be understood by those skilled in the art without departing from the spirit and scope of the invention. The scope of protection of the present invention is therefore subject to the scope of the appended claims. μ丨疋 has a simple description of the diagram] Figure 1 shows the computer through the power supply's cycle and the power supply dialogue.印职而12 200950292 l ^23twf.doc/n Figure 2 is an embodiment of a circuit diagram with a communication channel in accordance with the present invention over the output of the power supply. Figure 3 is another embodiment of a circuit schematic with a communication channel in accordance with the present invention for output thinning across the power supply. 4A illustrates a communication unit in accordance with an embodiment of the present invention. 4B illustrates another communication unit in accordance with an embodiment of the present invention. Figure 5 continued to illustrate an equivalent circuit of a communication channel in accordance with an embodiment of the present invention. Figure 6 is an oscillating circuit of a communication unit in accordance with an embodiment of the present invention. Figure 7 illustrates a wheeled data buffer of a communication unit in accordance with an embodiment of the present invention. Figure 8 is a diagram showing a wave circuit of a communication unit in accordance with an embodiment of the present invention. Figure 9 is an input data buffer of a communication unit not according to an embodiment of the present invention. Figure 10 is a single trigger circuit for generating a pulse signal in accordance with an embodiment of the present invention. Figure 11 is a diagram showing the waveform of a wheeling signal and a pulse signal _ according to an embodiment of the present invention. [Main component symbol description] 1〇: Power supply 11: Power converter 15: Inductor device 20: Electronic circuit 25: Inductor device 13 723twf.doc/n 200950292 Α Λφ i· 30 : Output cable WA ' WB ' WM ' WN : terminal

Ve : Power supply E+, E-: Terminal 100 : Communication unit sN...sG: Status data 200 : Communication unit ©V+, V- ·· Terminal

Dn...D〇: Input tribute 16, 26: Single-ended inductor 300: Output data buffer 400: Interface circuit 500: Input data buffer 150: Oscillation circuit XI, X2: Terminal 110: Operational amplifier G m : Resistor 112, 114, 115, 116, 118, 119: transistor 410: output circuit V〇sc: output signals II, I2, Ill2, Ill5. Current signal 250: filter circuit SH, SL: data signal 151, 152, 153 , 154: current source 14 200950292 " / ____ a 723twf.doc / n 161, 162, 163, 164: switch 170: capacitor 181, 182: comparator 183, 184: NAND (NAND) gate 185, 187: reverse ENB: Enable signal 190, 195: Switch VH, VL: Trip point voltage 319~310: Trigger 320: Inverter 325: AND gate 210, 220: Capacitor 260: Differential amplifier INM: Negative input INP: Positive input 270, 280: Filter ❹ SH: High logic data letter zero

Sl: low logic data signal 351~359: flip-flop 360: AND gate 361: inverter 362: or gate PLS: pulse signal 370: one-shot circuit 15 / 23twf.doc / n 200950292 37 372: current source 373: Inverter 374, 384: transistor 375, 385: capacitor 380: NAND gate 390: or NOT (NOR) gate TD: delay time pulse width IN: input signal

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Claims (1)

200950292—10. Applying for patents and difficulties: 1. A power supply system, including: one round of cable; power transfer is difficult, and it refers to the wheel & (four) to the electronic circuit power; a 彳 σ unit coupled to the output to be thin and form a communication channel between the power converter and the electronic circuit: and an inductive device coupled to the wheeled cable and Providing an impedance between the converter and the communication unit, wherein the communication unit transmits communication data through the output power and reports the status of the power converter to the electronic circuit. The power supply system of claim 1, wherein the inductive device is a common mode choke coil. 3. The power supply system of claim 1, wherein the communication data is modulated into a frequency shift. a keying signal, the frequency shift keying signal being coupled to the output cable of the power supply. The power supply system of claim 3, wherein the frequency shift keying The signal is a current signal. 5. The power supply system of claim 3, wherein the communication unit comprises: an output data buffer responsive to the power converter Stately generating an output data; a vibrating circuit responsive to said output data to generate said control signal; 17/50/n having an output circuit coupled to said wheeled cable of said power supply, And outputting the frequency shift keying signal; an input circuit coupled to the wheeling cable of the power supply and receiving the frequency shift keying signal; and a filter circuit coupled to the input The power supply system of claim 1, wherein the state of the power converter includes an input electrical output of the power converter, wherein the power supply system is responsive to the frequency shift keying signal. Voltage and temperature. 7. A power supply, comprising: a force rate converter that supplies power through an output electron microscope-electronic circuit of the power supply; and a communication unit coupled to the power supply The output electron microscope 'and forming a communication channel between the power converter and the electronic circuit, wherein the communication unit transmits through the output cable The communication data, © and the power conversion (four) status is reported to the electronic circuit. The power supply according to the seventh aspect of the invention, further comprising two inductive devices, the inductive device The output cable of the power supply to separate the communication data from the power supply. 9. The power supply of claim 8, wherein the inductive device is a common mode choke 10. The power supply of claim 7, wherein the pass data is modulated into a frequency shift keying signal, and the frequency shift keying signal 200950292"twfdoc/n is coupled to the power supply. The output cable of the device. 11. The power supply of claim 10, wherein the frequency shift keying signal is a current signal. 12. The power supply of claim 7, wherein the communication unit comprises: an output data buffer that generates an output data in response to a state of the power converter; "" an oscillating circuit Generating, in response to the output data, the frequency shift key control signal, an output circuit coupled to the wheeling cable of the power supply, and outputting the frequency shift keying signal; an input circuit Connected to the round-trip cable of the power supply and receive the frequency shift keying signal; and a filter circuit 'coupled to the wheel-in circuit and generated in response to the frequency-shifted keying signal Enter the data. 19