CN210868231U - Power supply circuit control circuit and power supply circuit - Google Patents
Power supply circuit control circuit and power supply circuit Download PDFInfo
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- CN210868231U CN210868231U CN201920516684.9U CN201920516684U CN210868231U CN 210868231 U CN210868231 U CN 210868231U CN 201920516684 U CN201920516684 U CN 201920516684U CN 210868231 U CN210868231 U CN 210868231U
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Abstract
The utility model discloses a power supply circuit control circuit and power supply circuit, control circuit receive single line digital input signal, according to single line digital input signal, adjust multichannel power supply circuit's output value. The output value of the multi-path power supply circuit is adjusted by adopting a single-wire communication protocol, so that the system is more intelligent.
Description
Technical Field
The utility model relates to a power electronic technology field, concretely relates to power supply circuit control circuit and power supply circuit.
Background
In the prior art, a plurality of communication lines are generally required for controlling a plurality of power modules. Referring to fig. 1, in order to control the output of the power circuit by using a PWM signal or an analog signal, when the load 200 is an LED lamp, the PWM signal or the analog signal may be used to perform dimming control. If there are multiple power circuits and loads, multiple PWM signals or analog signals are needed to control the multiple channels respectively. Therefore, the system has more wiring and is more complex.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention provides a power circuit control circuit and a power circuit for solving the problem of the prior art that the system has a complicated multi-path power module system.
The technical solution of the utility model is that, a power supply circuit control method is provided, receives single line digital input signal, according to single line digital input signal adjusts multichannel power supply circuit's output value.
Optionally, the single-wire digital input signal adopts a single-wire communication protocol, and the single-wire communication protocol is unipolar return-to-zero codes, unipolar non-return-to-zero codes, bipolar non-return-to-zero codes, manchester codes, pulse width codes or non-return-to-zero reverse codes.
Optionally, the power circuit is an ac input, a constant current output, and the reference current or reference voltage of the power circuit or/and the conduction time or/and the duty cycle or/and the switching frequency of the switching tube are adjusted to adjust the output current of the power circuit.
Another technical scheme of the utility model is, a power supply circuit control circuit is provided, control circuit receives single line digital input signal, according to single line digital input signal adjusts multichannel power supply circuit's output value.
Optionally, the single-wire digital input signal adopts a single-wire communication protocol, and the single-wire communication protocol is unipolar return-to-zero codes, unipolar non-return-to-zero codes, bipolar non-return-to-zero codes, manchester codes, pulse width codes or non-return-to-zero reverse codes.
Optionally, the power circuit is an ac input, a constant current output, and the reference current or reference voltage of the power circuit or/and the conduction time or/and the duty cycle or/and the switching frequency of the switching tube are adjusted to adjust the output current of the power circuit.
Optionally, the control circuit includes a decoding circuit, a register, a digital-to-analog conversion circuit, and a command current/voltage generation circuit, the decoding circuit receives the single-wire communication input signal and converts the single-wire communication input signal into a first digital signal, the register receives an output signal of the decoding circuit and registers the first digital signal, the register outputs a second digital signal, the digital-to-analog conversion circuit receives an output signal of the register and converts the second digital signal into a second analog signal, and the command current/voltage generation circuit receives the second analog signal and generates a command current/voltage according to the second analog signal.
Optionally, the control circuit further includes a switching period generating circuit, and the switching period generating circuit receives the second analog signal and generates the switching period according to the second analog signal.
Optionally, the single-wire digital input signal is an L-bit data code and an M-bit activate code, the L-bit data code is stored in the register when the activate code is not received, and the register outputs the L-bit data code when the activate code is received.
Optionally, the power circuit comprises a dimmer, and the output current varies with the change of the conduction angle of the input voltage.
Another technical solution of the present invention is to provide a power supply circuit.
Adopt the utility model discloses a circuit structure and method, compared with the prior art, have following advantage: the output value of the multi-path power supply circuit is adjusted by adopting a single-wire communication protocol, so that the system is more intelligent.
Drawings
Fig. 1 schematically illustrates a power supply circuit for regulating an output using a PWM or analog signal input in a conventional scheme;
fig. 2 schematically illustrates a power supply circuit employing a single-wire digital input in accordance with an embodiment of the present invention;
fig. 3 schematically illustrates a block diagram of a control circuit 300 according to an embodiment of the invention;
fig. 4 schematically shows a block diagram of a control circuit 300 according to yet another embodiment of the present invention;
fig. 5 schematically shows a block diagram of a control circuit 300 of one embodiment in a switching circuit according to the present invention;
fig. 6 schematically illustrates a block diagram of a control circuit 300 for one embodiment in a linear circuit in accordance with the present invention;
fig. 7 schematically shows a block diagram of a control circuit 300 according to another embodiment of the invention in a linear circuit;
fig. 8 schematically shows a block diagram of a control circuit 300 according to yet another embodiment of the invention in a linear circuit;
figure 9(a) schematically illustrates a single-wire digital input signal according to one embodiment of the present invention;
fig. 9(b) schematically illustrates a single-line digital input signal containing a start bit and a stop bit in accordance with an embodiment of the present invention;
fig. 9(c) schematically illustrates a single-line digital input signal containing blank bits according to one embodiment of the present invention;
fig. 9(d) schematically illustrates an encoding in which a plurality of power supply circuits receive different data codes according to an embodiment of the present invention;
fig. 9(e) schematically illustrates an encoding in which a plurality of power supply circuits receive different data codes according to another embodiment of the present invention;
fig. 9(f) schematically illustrates a single-wire digital input signal containing a reset code according to one embodiment of the present invention;
fig. 9(g) schematically illustrates a single-wire digital input signal containing address bits and a check code according to one embodiment of the present invention;
fig. 10 schematically illustrates a power supply circuit with a dimmer employing single line digital input in accordance with an embodiment of the present invention;
fig. 11 schematically shows a block circuit diagram of a control circuit in a power supply circuit with a dimmer according to an embodiment of the present invention;
fig. 12 schematically shows a circuit block diagram of each power circuit with a dimmer according to an embodiment of the present invention, wherein the power circuits adopt single-wire digital input;
fig. 13 schematically illustrates a block circuit diagram of a common dimmer and rectifier bridge for each power circuit using a single line digital input, in accordance with an embodiment of the present invention;
fig. 14 schematically shows a circuit block diagram of a control circuit in a common dimmer and rectifier bridge for each power circuit according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to only these embodiments. The present invention covers any alternatives, modifications, equivalents, and alternatives falling within the spirit and scope of the present invention.
In the following description of the preferred embodiments of the present invention, specific details are set forth in order to provide a thorough understanding of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without these specific details.
The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. It should be noted that the drawings are simplified and in non-precise proportion, and are only used for the purpose of conveniently and clearly assisting in explaining the embodiments of the present invention.
The utility model provides a power supply circuit control circuit, please refer to fig. 2 and show, control circuit 300 receives single line digital input signal, according to single line digital input signal, adjusts multichannel power supply circuit's output value. The multi-path power circuit 100 is a first power circuit and a second power circuit, wherein N is an integer greater than or equal to 2. The control circuit 300 receives the single-wire digital input signal and generates N driving signals to drive the N power circuits. The power supply circuits may be switch circuits or linear circuits, and the power supply circuits may be of different types, for example, the first circuit is a switch circuit, the second circuit is a linear circuit, and the like, and various combinations are possible.
As an embodiment, the single-wire digital input signal adopts a single-wire communication protocol, and the single-wire communication protocol is unipolar return-to-zero codes, unipolar non-return-to-zero codes, bipolar non-return-to-zero codes, Manchester codes, pulse width codes or non-return-to-zero reverse codes.
In one embodiment, the power circuit is an alternating current input and a constant current output, and the reference current or reference voltage of the power circuit or/and the conduction time or/and the duty ratio or/and the switching frequency of the switching tube are adjusted so as to adjust the output current of the power circuit.
As an embodiment, referring to fig. 3, the control circuit includes a decoding circuit 310, a register 320, a digital-to-analog conversion circuit 330, and a command current/voltage generation circuit 340, where the decoding circuit 310 receives the single-wire communication input signal and converts the single-wire communication input signal into a first digital signal, the register 320 receives an output signal of the decoding circuit and registers the first digital signal, the register 320 outputs a second digital signal, the digital-to-analog conversion circuit 330 receives an output signal of the register 320 and converts the second digital signal into a second analog signal, and the command current/voltage generation circuit 340 receives the second analog signal and generates a command current/voltage according to the second analog signal. When there are N power circuits, the command current/voltage generating circuit 340 of each power circuit, i.e. the first command current/voltage generating circuit and the second command current/voltage generating circuit … …, the nth command current/voltage generating circuit, receives the second analog signal and generates the command current/voltage according to the second analog signal. The power supply circuit may be a switching circuit or a linear circuit.
As an example, referring to fig. 4, in the switching circuit, in order to further increase the dimming depth, in addition to changing the command voltage or the command current, the switching frequency needs to be decreased. The control circuit further includes a switching period generating circuit 350, and the switching period generating circuit 350 receives the second analog signal and generates a switching period according to the second analog signal. For example, when the conduction time of the main switching tube of the switching circuit has reached the minimum conduction time, if the single-wire digital input signal transmits a signal for further reducing the brightness, the output current can be reduced by reducing the switching frequency.
Referring to fig. 5, a block diagram of an embodiment of a control circuit 300 in a switching power supply is shown, taking a command current as an example, the control circuit further includes a command current generating circuit 340, a feedback circuit 360, a switching signal generating circuit 370, a switching period generating circuit 350, a driving circuit 380, and a compensation capacitor C301. The command current generating circuit 340 and the feedback circuit 360 are both connected to the compensation capacitor C301, the voltage on the compensation capacitor C301 is the compensation voltage COMP, the switching signal generating circuit 370 receives the compensation voltage COMP and the output voltage of the switching period generating circuit 350, and generates the switching signal. The switching signal generating circuit 370 may adopt a peak current control mode, the compensation voltage COMP controls the peak value of the inductor current, controls the turn-off time of the main switching tube, and the switching period generating circuit 350 controls the turn-on time of the main switching tube; the switching signal generating circuit 370 may adopt a constant on-time control mode, the compensation voltage COMP controls the on-time of the switching tube, controls the turn-off time of the main switching tube, and the switching period generating circuit 350 controls the turn-on time of the main switching tube; the control modes used by the switching signal generating circuit 370 are not limited to the above two modes, and various other control modes may be used. The driving circuit 380 receives the switching signal, generates a driving signal, and drives the switching tube in the switching power supply to be turned on and off.
As an embodiment, referring to fig. 6, in the linear circuit, in addition to changing the command voltage or the command current, the output current may be adjusted by controlling the on-time or/and the duty ratio of the switching tube. Taking the example of only adjusting the duty ratio of the switching tube to adjust the output current, when the single-line digital signal input represents that the output current is the maximum brightness, the duty ratio of the switching tube is 100%; when the single-line digital signal input represents that the output current is half of the brightness, the duty ratio of the switching tube is 50%. In the linear circuit, the output current may be adjusted by adjusting the duty ratio of the switching tube and the command voltage/current at the same time.
Referring to fig. 7, a block diagram of an embodiment of a control circuit 300 in a linear power supply is shown, taking a command current as an example, the control circuit includes a command current generating circuit 340, a feedback circuit 360, a driving circuit 380 and a compensation capacitor C301. The instruction current generating circuit 340 and the feedback circuit 360 are both connected to the compensation capacitor C301, the voltage on the compensation capacitor C301 is a compensation voltage COMP, and the driving circuit 380 receives the compensation voltage COMP and generates a driving signal according to the compensation voltage COMP. The driving signal is connected to the control end of the switching tube of the linear circuit, and the output size of the linear circuit is adjusted by adjusting the size of the driving signal.
Referring to fig. 8, a block diagram of an embodiment of a control circuit 300 in a linear power supply is shown, taking command current as an example, the control circuit includes a command voltage generating circuit 340, a feedback circuit 360, a driving circuit 380 and an operational amplifier circuit 390. The command voltage generation circuit 340 and the feedback circuit 360 are both connected to the operational amplification circuit 390, and the operational amplification circuit 390 performs operational amplification on the outputs of the command voltage generation circuit 340 and the feedback circuit 360 and outputs the compensation voltage COMP. The driving circuit 380 receives the compensation voltage COMP and generates a driving signal according to the compensation voltage COMP. The driving signal is connected to the control end of the switching tube of the linear circuit, and the output size of the linear circuit is adjusted by adjusting the size of the driving signal.
In the embodiments of fig. 7 and 8, the magnitude of the output may be adjusted by adjusting the magnitude of the command current generating circuit 340 based on the single-wire digital input signal or/and adjusting the duty cycle of the driving signal generated by the driving circuit 380 based on the single-wire digital input signal.
As an embodiment, the single-line digital input signal is an L-bit data code and an M-bit activate code, as shown in fig. 9 (a). When the activation code is not received, the L-bit data code is stored in the register, when the activation code is received, the register outputs the L-bit data code, L and M are both natural numbers, and M is 1, which is a convenient and common setting. The single-wire digital input signal may further include start bits and/or stop bits, and as shown in fig. 9(b), the data encoding may be performed in the order from the high bits to the low bits: start bit, data code, stop bit, activate code. After the start bit is received, the received data is valid, and after the stop bit is received, the code writing is finished. The start bit precedes the data code and the stop bit succeeds the data code, and the start bit and/or the stop bit is a data packet or a bit code. The single-line digital input signal may contain blank bits as shown in fig. 9(c), in which the data code and the blank bits are one field. The data codes given to different power circuits can be different, so that the data codes corresponding to different power circuits are also different, and blank bits are added among the data codes of different power circuits to represent the division. For example, a 3-way power circuit receives different data codes respectively, and a start bit, a stop bit and a blank bit are added. The first encoding is sequentially: the start bit, the data code of the first power supply circuit, the blank bit, the data code of the second power supply circuit, the blank bit, the data code of the third power supply circuit, the blank bit, the stop bit and the activation code. As shown in fig. 9(d), a first encoding scheme is used to receive a code of different data codes for a plurality of power circuits, wherein the data code plus the blank bit is a field, the start bit, plus a plurality of fields plus the stop bit and the activate code form a complete data frame. The complete data frame can be called a data packet, and the data packet contains data codes for each power supply circuit. The second encoding is sequentially: the start bit, the data code of the first power supply circuit, the blank bit, the stop bit, the start bit, the data code of the second power supply circuit, the blank bit, the stop bit, the start bit, the data code of the third power supply circuit, the blank bit, the stop bit and the activation code. As shown in fig. 9(e), in order to receive a data frame of different data codes for multiple power circuits by using the second encoding method, the start bit, the data code, the blank bit and the stop bit are fields, and multiple fields plus the activate code form a data frame. The single-wire digital input signal may include any one or more of a start bit, a stop bit, and a blank bit.
Taking the encoding in FIG. 9(e) as an example, the first bit of the start bit is the most significant bit, the last bit of the activate code is the least significant bit, and the single-wire digital input signal may be preceded by either the most significant bit or the least significant bit.
The single-wire digital input signal also comprises a reset code, when the reset code is received, the data of each register is cleared, the reset code is generally placed at the forefront of the single-wire digital input signal, if a start bit exists, the reset code is placed at the forefront of the start bit, and if no start bit exists, the reset code is placed at the forefront of the data code. As shown in fig. 9(f), for an embodiment with a start bit and a reset code, the coding order is: reset code, start bit, data code, stop bit and activate code.
In one embodiment, for serial data transmission, the control circuit sends the single-wire digital signal to the first power circuit, and latches its data code content when the first power circuit receives the single-wire digital input signal, the first power circuit transfers the rest of the single-wire digital input signal to the second power circuit, the second power circuit latches its data code content, and transfers … … the rest of the single-wire digital input signal to the third power circuit, and so on. The control circuit can also send the single-wire digital signal to any one power supply circuit and transmit the single-wire digital signal to other power supply circuits. The two encoding schemes of fig. 9(d) and 9(e) can be used in the serial data transmission scheme.
In another embodiment, the control circuit sends the single-wire digital input signal to each of the power circuits for parallel data transmission, in which the single-wire digital input signal further includes address bits, each data code having corresponding address bits to characterize which power circuit the data code is intended for. In parallel data transmission, the single-wire digital input signal also includes a check code, typically following the address bits to ensure that the transmitted address bits are correct. The power circuit compares the check codes, and if the check codes are completely the same, the received address bit is considered to be correct. The single-wire digital input signal may not contain an activate code, but the control circuit generates the activate code itself. In one embodiment, the activation code is automatically generated if the verification code is correct. As shown in fig. 9(g), an embodiment of a field containing address bits and a check code is shown, and the field is composed of address bits, a check code, a reset code, a start bit, a data code, a blank bit, and a stop bit in order from high order to low order.
In another embodiment, the single-wire digital input signal contains an interference rejection protocol. The data packets may be interfered and corrupted during transmission, and the received data packets may be different from the transmitted data packets. Therefore, the data frames to be transmitted are transmitted for K times, namely K data frames are contained in one data packet, and when the data frames received by the power circuit for K times are all the same, the activation code is automatically generated. To improve efficiency, K is set to 2, and the power supply circuit compares some data in the data frame to be identical, and considers the rest of the received data in the data packet to be identical. In one embodiment, the power circuit compares the check bits and if the check bits are identical, the remaining data of the received data packet is considered identical.
As an example, the system for controlling the output current by the single-wire digital signal may further include a dimmer. The power supply circuit comprises a dimmer, and the output current changes along with the change of the conduction angle of the input voltage.
Referring to fig. 10, an embodiment of adding a dimmer to a power circuit is shown, in which one end of an ac input is connected to input ends of a first power circuit and a second power circuit through the dimmer. The dimmer may be a front-cut dimmer or a rear-cut dimmer, and the TRIAC dimmer is a commonly used front-cut dimmer. Each power circuit 100 receives an input voltage, rectifies the input voltage to obtain a bus voltage, and a control circuit detects an input conduction angle by using a first bus voltage and a second bus voltage, wherein the control circuit is a circuit block diagram for adjusting a reference current or a reference voltage of the power circuit according to the conduction angle, as shown in fig. 11, and the control circuit 300 further includes a conduction angle detection circuit 311, and adjusts the reference current or the reference voltage of the power circuit according to an output of the conduction angle detection circuit 311. In another embodiment, in the linear circuit, the on-time or/and duty ratio of the switching tube may be adjusted according to the output of the on-angle detection circuit 311 to adjust the output current of the power supply circuit; the scheme is suitable for keeping the average value of the output current of the power circuit in a half power frequency period stable, namely controlling the output current to filter secondary power frequency ripples and performing closed-loop control on the output current in the half power frequency period.
In yet another embodiment, in the switching circuit with dimmer, the switching frequency of the switching tube may also be adjusted according to the output of the conduction angle detection circuit 311.
In another embodiment, in a linear circuit with a dimmer, the output current is controlled in real time, the average value of the output current in a half power frequency period is not controlled to be kept stable, and the output current is not subjected to closed-loop control in the half power frequency period. Therefore, when the conduction angle of the dimmer is changed, the command voltage or the command current is not changed, and the driving signal is not changed, namely the duty ratio of the light-on tube is not changed. The output current changes with the change of the conduction angle.
In another embodiment, a dimmer may be added to each power circuit, and the block diagram of the power circuit is shown in fig. 12.
In yet another embodiment, the dimmer and rectifier bridge 110 may be shared for each power circuit, a block diagram of which is shown in fig. 13. In this embodiment, dimming may be implemented by detecting the obtained conduction angle of the bus voltage to adjust the command voltage or the command current, or the switching frequency in the switching circuit or the duty ratio of the switching tube in the linear circuit; the output current can be controlled in real time, and the command current, the command voltage and the duty ratio of the switching tube are not changed in a system which does not perform closed-loop control on the output current in a half power frequency period, so that the dimming can be naturally realized. Taking the example of adjusting the command current or the command voltage by detecting the conduction angle, since each power circuit shares the rectifier bridge, the bus voltages of each power circuit are the same, so the control circuit 300 only needs to detect one bus voltage, and the block diagram of the control circuit 300 is shown in fig. 14. The conduction angle detection circuit 311 detects the bus voltage, and the first command voltage current generation circuit, the second command voltage current generation circuit … …, the nth command voltage current generation circuit all receive the output of the conduction angle detection circuit 311 and adjust the command current or the command voltage of each path according to the output of the conduction angle detection circuit 311.
The utility model discloses a technical solution is, provides a power supply circuit's control method, receives the single line communication input signal, according to the single line communication input signal, adjusts multichannel power supply circuit's output value.
In one embodiment, the single-wire communication protocol is unipolar return-to-zero codes, unipolar non-return-to-zero codes, bipolar non-return-to-zero codes, Manchester codes, pulse width codes, or non-return-to-zero reverse codes.
In one embodiment, the power circuit is an alternating current input and a constant current output, and the reference current or reference voltage of the power circuit or/and the conduction time or/and the duty ratio or/and the switching frequency of a switching tube are adjusted so as to adjust the output current of the power circuit.
Another technical solution of the present invention is to provide a power supply circuit.
In addition, although the embodiments are described and illustrated separately, it will be apparent to those skilled in the art that some common techniques may be substituted and integrated between the embodiments, and reference may be made to one of the embodiments without explicit mention.
The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.
Claims (5)
1. A power circuit control circuit, characterized by: the control circuit receives a single-wire digital input signal and adjusts the output value of the multi-path power supply circuit according to the single-wire digital input signal;
the control circuit comprises a decoding circuit, a register, a digital-to-analog conversion circuit and an instruction current/voltage generation circuit, wherein the decoding circuit receives the single-wire digital input signal and converts the single-wire digital input signal into a first digital signal, the register receives an output signal of the decoding circuit and registers the first digital signal, the register outputs a second digital signal, the digital-to-analog conversion circuit receives the output signal of the register and converts the second digital signal into a second analog signal, and the instruction current/voltage generation circuit receives the second analog signal and generates instruction current/voltage according to the second analog signal.
2. The control circuit of claim 1, wherein: the power circuit is used for alternating current input and constant current output, and the reference current or reference voltage of the power circuit or/and the conduction time or/and the duty ratio or/and the switching frequency of the switching tube are adjusted so as to adjust the output current of the power circuit.
3. The control circuit of claim 1, wherein: the control circuit further comprises a switching period generating circuit, and the switching period generating circuit receives the second analog signal and generates a switching period according to the second analog signal.
4. The control circuit of claim 1, wherein: the power supply circuit comprises a dimmer, and the output current changes along with the change of the conduction angle of the input voltage.
5. A power supply circuit, characterized by: comprising a control circuit according to any of claims 1-4.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110062500A (en) * | 2019-04-16 | 2019-07-26 | 杰华特微电子（杭州）有限公司 | Power supply circuit control method, control circuit and power circuit |
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| CN110062500A (en) * | 2019-04-16 | 2019-07-26 | 杰华特微电子（杭州）有限公司 | Power supply circuit control method, control circuit and power circuit |
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Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Patentee after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Patentee before: JOULWATT TECHNOLOGY (HANGZHOU) Co.,Ltd. |
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