Vehicle antenna driver device

Abstract

To provide an antenna driver device for a vehicle, which can obtain an ideal resonance effect, reduce the size of a finished product, and greatly reduce costs. [Solution] The vehicle antenna driver device includes a control circuit board 61. The control circuit board includes a control switch unit, a resonant circuit switch unit 612, and a resonant circuit unit 613. The control switch unit includes a controller 6111 and a switch module 6112. The controller outputs an on / off signal. The on / off signal is a high potential signal or a low potential signal. The switch module is electrically connected to the controller. The switch module includes a first resistive element and a first switching element. A first series connection point is provided between the first resistive element and the first switching element. One end of the first switching element is electrically connected to the controller and receives the on / off signal.

Description

[Technical field]

[0001] The present invention relates to an antenna driver device for a vehicle, and more particularly to a half-bridge resonant driving circuit device for use in an antenna driver for a vehicle. [Background technology]

[0002] Resonant driver circuits are a mature technology and are widely used in our daily lives, especially in speakers and communication related products.

[0003] Many of the early resonant driver circuits consist of a full-bridge circuit (see Figure 1). Such a full-bridge resonant driver circuit 1 has the following advantages (1) and (2): (1) the technology is highly mature and already well known to the public; (2) the full-bridge switch can further increase the point-to-point resonant voltage, thereby increasing the signal transmission distance under the condition that the input voltage is the same.

[0004] On the other hand, the drawbacks of the full bridge circuit also became evident. In other words, the more elements used, the more switching elements (S1, S2, S3, S4) must be used. When there are a large number of elements, the dimensions of the finished product also become larger, which creates a problem in that the volume of the finished product becomes too large for low-voltage systems.

[0005] The problem of the above-mentioned large dimensions is becoming a major issue in today's world where miniaturization of products is required.

[0006] As shown in Figures 2A and 2B, in other driver circuits, a gate driver IC 2 is always used for the driver resonant circuit. In particular, it is always used for driving half-bridge resonant driving circuit devices 3 and 4. HO represents a high-potential output signal. L0 represents a low-potential output signal.

[0007] By using the gate driver IC 2, the volume problem of the full bridge could be reliably solved, and if high-voltage resistant switching elements (S5, S6, S7, S8) could be selected, it could be applied to high-voltage systems, but the cost of the gate driver IC 2 increased the manufacturing cost of the product, and the cost burden became large when there were a large number of products. Therefore, the use of the gate driver IC 2 was not the optimal choice.

[0008] Currently, the voltage of many car antenna systems is over 36V, and the new half-bridge circuit can meet the product's required standards, so there is no need to use a full-bridge circuit. Furthermore, the present invention uses an analog circuit instead of a gate driver IC, which can greatly reduce manufacturing costs, so the car antenna driver device of the present invention should be the optimal solution. Summary of the Invention [Problem to be solved by the invention]

[0009] The object of the present invention is to provide an antenna driver device for a vehicle, which can obtain an ideal resonance effect at any frequency, reduce the dimensions of the finished product to make it compact, and greatly reduce costs to increase its competitiveness in the market. [Means for solving the problem]

[0010] In order to solve the above problems, according to a first aspect of the present invention, there is provided an antenna driver device for a vehicle, comprising a control circuit board, the control circuit board having a control switch unit, a resonant circuit switch unit and a resonant circuit unit, the control switch unit having a controller and a switch module, the controller outputs an on / off signal, the on / off signal being a high potential signal or a low potential signal, the switch module is electrically connected to the controller, the switch module has a first resistance element and a first switching element, a first series connection point is provided between the first resistance element and the first switching element, one end of the first switching element is electrically connected to the controller and receives the on / off signal, the resonant circuit switch unit is a switch module of the control switch unit, the resonant circuit switch unit has a second switching element and a third switching element, a second series connection point is provided between the second switching element and the third switching element, when the second switching element or the third switching element is conductive, a resonant current flows through the second series connection point, the resonant circuit unit is electrically connected to the second series connection point, the resonant current flows through the resonant circuit unit, the resonant circuit unit has at least a resonant voltage control module and a resonant circuit module, the resonant voltage control module controls a current value of the resonant current, the resonant voltage control module is electrically connected to the resonant circuit module, and the resonant circuit module includes at least an inductor element and a capacitor element.

[0011] It is preferable that the control circuit board has a high potential end and a ground end, and the high potential end and the ground end are electrically connected to a power supply device.

[0012] It is preferable that the first series connection point is electrically connected to the second switching element and the third switching element, the controller outputs a low potential signal to the first switching element, the first switching element and the third switching element are not conductive, the second switching element is made conductive due to a voltage difference between the first series connection point and the second series connection point, the controller outputs a high potential signal to the first switching element, the first switching element is made conductive, and the second switching element is turned off and the third switching element is made conductive due to a voltage difference between the first series connection point and the second series connection point.

[0013] The first resistive element controls a current flowing through the first switching element, and the first resistive element is preferably a general resistor, a variable resistor, or various resistors connected in series and parallel.

[0014] It is preferable that the resonant voltage control module has a second resistive element, which controls the current value of the resonant current, and the second resistive element is a general resistor, a variable resistor, or various resistors connected in series and parallel.

[0015] The first switching element, the second switching element and the third switching element are preferably bipolar transistors, metal-oxide semiconductor field-effect transistors (MOSFETs) or multi-control switches.

[0016] Preferably, the controller sets a resonant frequency, and the resonant circuit module selects different capacitor elements and different inductor elements in response to differences in the resonant frequency. Effect of the Invention

[0017] The vehicle antenna driver device of the present invention can achieve an ideal resonance effect at any frequency, and the dimensions of the finished product can be reduced to make it more compact. In addition, the cost can be significantly reduced to enhance the competitiveness in the market. [Brief description of the drawings]

[0018] [Figure 1] FIG. 1 is a circuit diagram showing a prior art full-bridge resonant driver circuit. [Figure 2A] FIG. 1 is a circuit diagram showing a half-bridge resonant driver circuit using prior art gate drivers. [Figure 2B] FIG. 1 is a circuit diagram showing a half-bridge resonant driver circuit using prior art gate drivers. [Diagram 3] 1 is a block diagram showing a state in which an antenna driver device for a vehicle according to an embodiment of the present invention is connected to a power supply device; [Figure 4] 1 is a block diagram showing an embodiment of a vehicle antenna driver device according to the present invention; [Diagram 5] 1 is a first embodiment of a circuit diagram of a vehicle antenna driver device according to the present invention; FIG. [Figure 6] 4 is a second circuit diagram of a vehicle antenna driver device according to an embodiment of the present invention; FIG. [Figure 7] 4 is a graph showing a resonant waveform of the vehicle antenna driver device according to the embodiment of the present invention. [Figure 8] FIG. 1 is a circuit diagram showing a simple resonant circuit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Other technical contents, features and effects of the present invention will become apparent from the following detailed description of preferred embodiments with reference to the accompanying drawings.

[0020] Please refer to Figures 3 to 5. FIG. 3 is a block diagram showing a state in which a vehicle antenna driver device according to an embodiment of the present invention is connected to a power supply device. FIG. 4 is a block diagram showing a vehicle antenna driver device according to an embodiment of the present invention. FIG. 5 is a first embodiment circuit diagram of a vehicle antenna driver device according to an embodiment of the present invention. As shown in FIG. 3 to FIG. 5, a vehicle antenna driver device 6 according to an embodiment of the present invention includes at least one control circuit board 61. The control circuit board 61 has a high potential end and a ground end. The high potential end and the ground end are electrically connected to a power supply device 5.

[0021] The power supply device 5 is an electronic device that supplies power to the control circuit board 61 .

[0022] The control circuit board 61 is a circuit board body or a circuit carrier on which an electronic circuit such as a circuit board is laid out.

[0023] One or more control circuit boards 61 may be installed in the vehicle antenna driver device 6. The circuit layout provided inside the vehicle antenna driver device 6 may be implemented by layouting on one circuit board or different circuit boards. Here, the circuit board refers to the control circuit board 61.

[0024] The control circuit board 61 includes a control switch unit 611 , a resonant circuit switch unit 612 , and a resonant circuit unit 613 .

[0025] The control switch unit 611 at least includes a controller 6111 and a switch module 6112 .

[0026] The controller 6111 is a processor component such as an MCU (Micro Controller Unit). The MCU includes at least a CPU, a memory (e.g., ROM, RAM, etc.), and peripheral devices (e.g., ADC, DAC, GPIO, PWM, etc.). Programmed operations, various commands, data such as variables, etc. are written in the memory, and these programmed operations are sequentially executed by the CPU.

[0027] The controller 6111 outputs an on / off signal, which is a high potential signal or a low potential signal.

[0028] Please refer to Figure 5. 5, the switch module 6112 is electrically connected to the controller 6111. The switch module 6112 has a first resistor element R3 and a first switching element S9. A series connection point A1 is provided between the first resistor element R3 and the first switching element S9. The series connection point A3 at one end of the first switching element S9 is electrically connected to the controller 6111 and receives an on / off signal.

[0029] In this embodiment, the first switching element S9 is described as being connected by a pin of a bipolar transistor (NPN transistor). However, the first switching element S9 of the present invention is not limited to a bipolar transistor, and may be replaced with an electronic element having the same function as an NPN transistor, such as a metal-oxide semiconductor field-effect transistor (MOSFET) or a multi-control switch.

[0030] The base of the first switching element S9 is electrically connected to the series connection point A3. The collector of the first switching element S9 is electrically connected to the series connection point A1. The emitter of the first switching element S9 is electrically connected to the ground terminal 615.

[0031] The first resistor R3 controls the current flowing through the first switching element S9. The first resistor R3 may be a general resistor, a variable resistor, or a series-parallel combination of various resistors.

[0032] The first resistor R3 is a current limiting resistor that prevents damage caused by an instantaneous excessive current when the first switching element S9 is turned on.

[0033] The resonant circuit switch unit 612 is electrically connected to the series connection point A1 of the switch module 6112. The series connection point A1 is connected to the series connection point A4 and the series connection point A5.

[0034] The resonant circuit switch unit 612 includes a second switching element S10 and a third switching element S11. A series connection point A2 is provided between the second switching element S10 and the third switching element S11. When the second switching element S10 or the third switching element S11 is conductive, a resonant current flows through the series connection point A2.

[0035] In this embodiment, the second switching element S10 is described as being connected by a pin of a bipolar transistor (NPN transistor). However, the second switching element S10 of the present invention is not limited to a bipolar transistor, and may be replaced with an electronic element having the same function as an NPN transistor, such as a metal-oxide semiconductor field-effect transistor (MOSFET) or a multi-control switch.

[0036] The base of the second switching element S10 is electrically connected to the series connection point A4. The collector of the second switching element S10 is electrically connected to the high potential end 614. The emitter of the second switching element S10 is electrically connected to the series connection point A2.

[0037] In this embodiment, the third switching element S11 is described as being connected by a pin of a bipolar transistor (PNP transistor). However, the third switching element S11 of the present invention is not limited to a bipolar transistor, and may be replaced with an electronic element having the same function as a PNP transistor, such as a metal-oxide semiconductor field-effect transistor (MOSFET) or a multi-control switch.

[0038] The base of the third switching element S11 is electrically connected to the series connection point A5. The emitter of the third switching element S11 is electrically connected to the series connection point A2. The collector of the third switching element S11 is electrically connected to the ground terminal 615.

[0039] The resonant circuit unit 613 is electrically connected to the series connection point A2. A resonant current flows through the resonant circuit unit 613. The resonant circuit unit 613 includes at least a resonant voltage control module 6131 and a resonant circuit module 6132.

[0040] The resonant voltage control module 6131 is electrically connected to the resonant circuit module 6132. The resonant voltage control module 6131 has a second resistive element R4. The second resistive element R4 controls the current value of the resonant current. The second resistive element R4 may be a general resistor, a variable resistor, or a series-parallel combination of various resistors.

[0041] The resonant circuit module 6132 includes at least an inductor element L4 and a capacitor element C5.

[0042] Please refer to Figure 5. 5 is a first embodiment circuit diagram of the vehicle antenna driver device according to the present invention. When the second switching element S10 is on and the third switching element S11 is off, the capacitor element C5 and the inductor element L4 are charged when the resonant current flows through the resonant circuit module 6132. When the second switching element S10 is off and the third switching element S11 is on, the capacitor element C5 and the inductor element L4 are discharged, and the different on / off switching states can maximize the energy exchange efficiency of the resonant circuit module 6132 and improve the gain effect of the passing signal.

[0043] In the first embodiment of the present invention, first, the first switching element S9, the second switching element S10 and the third switching element S11 are turned off (OFF), and the controller 6111 outputs a low potential signal to the first switching element S9. The potentials at the different points are as follows (1) and (2). (1) The potential of the series connection point A3 is low (Low), and the first switching element S9 is off (OFF). (2) Since the series connection point A1 is connected to the high potential end 614, the series connection point A1 is at high potential (High). When the series connection point A1 is connected to the series connection point A5, the series connection point A5 is at high potential. Therefore, the third switching element S11 is off (OFF). When the series connection point A1 is connected to the series connection point A4, the series connection point A4 is at high potential and a voltage difference is generated between the series connection point A4 and the series connection point A2, and this voltage difference turns on the second switching element S10.

[0044] The controller 6111 outputs a high-level potential signal to the first switching element S9, and the potentials at the different points are as follows (1) and (2). (1) The potential of the series connection point A3 is high (High), and the first switching element S9 is ON. (2) When the series connection point A1 is directly connected to the ground terminal 615, the series connection point A1 is at a low potential (Low). When the series connection point A1 is connected to the series connection point A4, the series connection point A4 is at a low potential. Therefore, the second switching element S10 is also off (OFF). When the series connection point A1 is connected to the series connection point A5, the series connection point A5 is at a low potential, and the capacitor element C5 is discharged to generate a voltage difference between the series connection point A5 and the series connection point A2, and this voltage difference turns on the third switching element S11.

[0045] Please refer to Figure 6. 6 is a second embodiment circuit diagram of the vehicle antenna driver device according to an embodiment of the present invention. The second embodiment circuit diagram shown in FIG. 6 is different from the first embodiment circuit diagram in the circuit elements of the resonant circuit module 6132. The resonant circuit module 6132 has an inductor element L4 and capacitor elements C6 and C7. The capacitor elements C6 and C7 are connected in series. A series connection point A6 is provided between the capacitor elements C6 and C7. An inductor element L4 is connected in series between the resonant voltage control module 6131 and the series connection point A6.

[0046] When the second switching element S10 is on (ON) and the third switching element S11 is off (OFF), the capacitor elements C6, C7 and the inductor element L4 are charged when the resonant current flows through the resonant circuit module 6132. When the second switching element S10 is off (OFF) and the third switching element S11 is on (ON), the capacitor elements C6, C7 and the inductor element L4 are discharged, and the different on / off switching states can maximize the energy exchange efficiency of the resonant circuit module 6132 and increase the gain effect of the passing signal.

[0047] When a power supply exceeding 36V provided by one power supply device connected to the high potential end 614 is input, the controller 6111 controls the number of times the first switching element S9 is turned on / off, and affects the switch activation of the second switching element S10 and the third switching element S11, adjusts the frequency required for the combination of the inductor element L4 and the capacitor element C5, and finally adjusts the value of the resonant voltage control module 6131 according to the magnitude of the required resonant energy to meet the needs of the user.

[0048] The principle of the resonant circuit described in this invention is as shown in Figure 8, the resonant circuit 7 generally has RLC (resistance element R6, inductor element L5 and capacitor element C8), L and C have electrical resistance under normal circumstances (L and C in the AC power supply have resistance to current), and each pair of L and C has a frequency (called resonant frequency). At this frequency, the electrical resistance of L and C is exactly 0Ω, and the current flowing through the circuit is also maximum. At this time, the energy of the inductor discharging (charging) is equal to the energy of the capacitor charging (discharging), and the energy can be expressed by the formula (1).

[0049]

number

[0050] Therefore, when the circuit reaches the resonant frequency, the current and voltage (between LC) reach a maximum value. R affects Q (quality factor), which can be expressed by equation (2).

[0051]

number

[0052] The larger Q (the smaller R) the higher the current and voltage.

[0053] The resonant frequency f0 of the series-connected resonant circuit is jointly determined by the inductor and the capacitor, and can be expressed by the following equation (3).

[0054]

number

[0055] The special electrical behavior that a circuit exhibits at this frequency is called resonance. The resonant frequency is the frequency of the circuit's natural oscillation.

[0056] At the resonant frequency f0, the inductive reactance of the inductor is equal to the capacitive reactance of the capacitor. Because the inductive reactance and capacitive reactance are equal and opposite to each other at resonance, they cancel each other out, minimizing the total resistance of the circuit and, ideally, leaving only electrical resistance.

[0057] As shown in Figure 7, under the resonant frequency, the total resistance is the lowest, so the current is the maximum value, and the phase difference between the voltage and the current is zero, which means they are in phase, which means the voltage and current waveforms are perfectly matched.

[0058] The waveform changes before and after resonance are as follows (1) to (3). (1) The frequency is lower than the resonant frequency, the effect of the capacitor is greater than that of the inductor, the circuit becomes capacitive, and the current leads the voltage. (2) When the frequency is higher than the resonant frequency, the effect of the inductor is greater than that of the capacitor, the circuit becomes inductive, and the current trails the voltage. (3) When the frequency is at the resonant frequency, the current and voltage are in phase and the circuit is purely resistive.

[0059] Therefore, in practical applications, such as in the receiver or emitter of a car antenna, a resonant circuit generates a specific signal frequency, and if this frequency is the resonant frequency, the gain effect of the circuit on the signal can be maximized, and the performance and efficiency of the system can be improved.

[0060] According to the present invention, different capacitor elements and inductor elements can be selected according to different resonant frequencies. Since the capacitor elements have common specifications (e.g., 1nF, 2.2nF, 3.3nF, etc.), the capacitor elements are selected first.

[0061] The technology of the present invention is mainly applied to the driver circuit of the car antenna. The related products of the car antenna are limited in distance according to the product specifications. For example, when using a key to open the door of a car, the usable distance of most products is within 5m. When the input voltage is 36V or more, this standard can be met by only adjusting some small parts of the half-bridge circuit. Therefore, the present invention can be implemented using the half-bridge circuit architecture instead of the full-bridge circuit architecture.

[0062] "Power" and "H_Power" shown in the drawings of this invention represent the anode terminals. "GND" shown in the drawings of this invention represents the ground terminal. The "S" shown in the drawings of this invention * " represents an electronic switch. * represents a different number. The "L" shown in the drawings of this invention * " represents an inductor element. * is a different number. The "C" shown in the drawings of this invention * " represents a capacitor element. * is a different number. The "R * " represents a resistive element. * is a different number.

[0063] The vehicle antenna driver device of the present invention has the following advantages (1) to (3) over the conventional technology. (1) The half-bridge driver circuit controls the frequency via the controller (MCU), and then by appropriately combining the inductor and capacitor values, an ideal resonance effect can be obtained at any frequency. (2) The use of a half-bridge circuit architecture reduces the number of elements by approximately 30% compared to a full-bridge circuit architecture, allowing for smaller dimensions and compact size of the finished product. (3) Since there is no need to use a gate driver (Gate Driver IC), costs can be significantly reduced and market competitiveness can be improved.

[0064] The preferred embodiments of the present invention have been disclosed above so that those skilled in the art can understand, but they are not intended to limit the present invention. Various changes and modifications can be made within the scope of the present invention. Therefore, the scope of the utility model registration claims of the present invention should be broadly interpreted to include such changes and modifications. [Explanation of symbols]

[0065] 1 Full-bridge resonant driver circuit 2 Gate Driver 3 Half-bridge resonant driver circuit 4 Half-bridge resonant driver circuit 5 Power supply device 6. Vehicle antenna driver device 7 Resonant circuit 61 Control circuit board 611 Control switch unit 612 Resonant Circuit Switch Unit 613 Resonant Circuit Unit 614 High potential end 615 Ground end 6111 Controller 6112 Switch Module 6131 Resonant Voltage Control Module 6132 Resonant Circuit Module A1 Series connection point A2 Series connection point A3 Series connection point A4 Series connection point A5 Series connection point A6 Series connection point C5 Capacitor Element C6 Capacitor element C7 Capacitor element C8 Capacitor Element L4 inductor element L5 inductor element R3 First resistor element R4 Second resistor element R6 Resistor element S1 Switching element S2 Switching element S3 Switching element S4 Switching element S5 Switching element S6 Switching element S7 Switching element S8 Switching element S9 First switching element S10 Second switching element S11 Third switching element

Claims

1. A vehicle antenna driver device having a control circuit board, the control circuit board includes a control switch unit, a resonant circuit switch unit, and a resonant circuit unit; The control switch unit includes a controller and a switch module. The controller outputs an on / off signal, the on / off signal being a high potential signal or a low potential signal; the switch module is electrically connected to the controller, the switch module has a first resistive element and a first switching element, a first series connection point is provided between the first resistive element and the first switching element, one end of the first switching element is electrically connected to the controller and receives an on / off signal; the resonant circuit switch unit is electrically connected to the switch module of the control switch unit, the resonant circuit switch unit has a second switching element and a third switching element, a second series connection point is provided between the second switching element and the third switching element, and when the second switching element or the third switching element is conductive, a resonant current flows through the second series connection point, the resonant circuit unit is electrically connected to the second series connection point, a resonant current flows through the resonant circuit unit, the resonant circuit unit has at least a resonant voltage control module and a resonant circuit module, the resonant voltage control module controls a current value of the resonant current, the resonant voltage control module is electrically connected to the resonant circuit module, and the resonant circuit module includes at least an inductor element and a capacitor element. Car antenna driver device.

2. the control circuit board has a high potential end and a ground end; 2. The vehicle antenna driver device according to claim 1, wherein the high potential end and the ground end are electrically connected to a power supply device.

3. the first series connection point is electrically connected to the second switching element and the third switching element; the controller outputs a low potential signal to the first switching element, the first switching element and the third switching element are not conductive, and the second switching element is conductive due to a voltage difference between the first series connection point and the second series connection point; 2. The vehicle antenna driver device according to claim 1, wherein the controller outputs a high potential signal to the first switching element, the first switching element is turned on, and a voltage difference between the first series connection point and the second series connection point turns off the second switching element and turns on the third switching element.

4. The first resistance element controls a current flowing through the first switching element; 2. The vehicle antenna driver device according to claim 1, wherein the first resistance element is a general resistor, a variable resistor, or a series-parallel combination of various resistors.

5. The resonant voltage control module has a second resistive element, The second resistive element controls a current value of a resonance current, 2. The vehicle antenna driver device according to claim 1, wherein the second resistance element is a general resistor, a variable resistor or a series-parallel combination of various resistors.

6. 2. The vehicle antenna driver device according to claim 1, wherein the first switching element, the second switching element and the third switching element are a bipolar transistor, a metal-oxide semiconductor field-effect transistor (MOSFET) or a multi-control switch.

7. The controller sets a resonant frequency; 2. The vehicle antenna driver device as claimed in claim 1, wherein the resonant circuit module selects different capacitor elements and different inductor elements according to the difference in the resonant frequency.

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